CN105973016A - System of step-by-step recycling and gradient utilization for sintering residual heat resources - Google Patents

Abstract

The invention provides a system for step-by-step recovery and cascade utilization of sintering waste heat resources, including: a cooling subsystem and a cascade utilization subsystem of waste heat resources; the cooling subsystem includes: an annular cooler, a waste heat hood, a high-pressure superheater, and a waste heat boiler , low-pressure superheater, and heat medium heat exchanger; the waste heat hood is set in the high-temperature cooling section, and the gas outlets of the waste heat hood are respectively connected to the waste heat boiler and the hot air utilization device. The waste heat hood is equipped with a high-pressure superheater, and the The output end is connected to the medium-pressure steam utilization device; the gas outlet of the waste heat boiler is respectively connected to the hot air utilization device and/or the ring cooler, and the waste heat boiler is equipped with a low-pressure superheater, and the output end of the low-pressure superheater is connected to the low-pressure steam utilization device; The heat medium heat exchanger is arranged in the low-temperature cooling section, the flue gas outlet of the heat medium heat exchanger is connected to the hot air utilization device, and the heat medium delivery pipe in the heat medium heat exchanger is connected to the heat medium utilization device.

Description

A system for step-by-step recovery and step-by-step utilization of sintering waste heat resources

technical field

The invention relates to the field of efficient utilization of energy, in particular to a system for recovering and utilizing sintering waste heat resources step by step.

Background technique

When the hot sinter is cooled, a large amount of waste heat resources are transferred to the cooling gas, and along the cooling process, medium-temperature and low-temperature hot exhaust gases are formed respectively. Among them, the waste heat of the medium-temperature waste gas above 300°C (usually lower than 450°C) is directly used and partially passed through waste heat. The medium-pressure steam produced by the boiler is used for heating or power generation, and a large amount of low-temperature (below 300°C) waste gas and waste heat resources are released into the atmosphere or the surrounding environment, resulting in energy waste, environmental pollution, cost increases and other unfavorable factors. Among the six typical processes in the long-process iron and steel process, the recovery rate of waste heat resources in the sintering process is the lowest, only about 22%, which is far lower than the industry average of 35%. Long-term research hotspots and directions of attention.

Patent 1 "Devices and methods for efficient recovery and utilization of waste heat resources in the sintering process CN201110058524" proposes that "the core of the graded recovery and cascade utilization technology is: the first-stage and second-stage cooling waste gas at the front end of the cooler is passed into the waste heat boiler after dust removal, and the generated The steam is used for power generation; the three-stage cooling exhaust gas in the middle of the cooler is returned to the ignition furnace and the sintering machine table for ignition and combustion support and hot air sintering respectively; the higher temperature sintering flue gas is introduced into the ignition furnace for drying of the sintering mixture ". There are two problems in this patented technology: the use of high-temperature waste gas at the front end of the cooler for steam recovery and power generation, and the use of medium-temperature cooling waste gas in the middle for sintering and ignition to save gas does not conform to the concept of energy cascade utilization. -430°C (different temperature distribution) for steam power generation, the energy conversion efficiency is only 20%, resulting in energy waste; on the other hand, using the middle temperature waste gas (150-200°C) in the middle of the cooler for sintering ignition, due to its low temperature, high-grade energy saving Energy - Gas is limited. At the same time, the idea of using the low-temperature cooling exhaust gas in the fifth section to continue cooling the fourth and third sections is not appropriate, and no successful implementation cases have been seen, mainly because: (1) It is actually impossible to implement due to the large increase in resistance and the large air leakage rate of the system; (2) As a result, the temperature of the waste gas at the entrance of the third and fourth sections rises, which affects the cooling effect of the sintering machine, which is not conducive to product quality assurance, and puts the cart before the horse.

Patent 2 "method for graded recovery and cascade utilization of waste heat resources in sintering process and its device CN200910187381" proposes "a method for graded recovery and cascade utilization of waste heat resources in metallurgical sintering process, which is characterized in that: hot sinter In a vertical closed tank, the temperature of the sinter is 800°C to 950°C; then air at normal temperature is introduced from the bottom of the tank, the ratio of the air flow rate to the sinter processing capacity, that is: the gas-solid ratio is 2000: 2500Nm3/t, make the hot sinter fully contact with air in the tank for cooling, the cooled sinter is discharged from the bottom of the tank, and the air carrying all the sensible heat of the sinter after fully contacting the sinter is discharged from the tank It is discharged from the upper part of the body, and after dust removal, it is passed into the waste heat boiler to produce steam, and the steam produced is merged into the steam pipe network or used for power generation. The patent is based on the new sinter vertical cooling process. There is no successful case of sinter vertical cooling in the world.

To sum up, the existing sintering process adopts ring or belt cooling process, and there is no vertical cooling process. For the existing sintering machine, the current waste heat recovery is unreasonable or existing problems: (1) ring cooler or The cooling process with a cooler turns the high-temperature (750°C) sinter waste heat resource into a high, medium and low-temperature waste gas waste heat resource with a uniform distribution of temperature from 450-80°C, and the temperature gradually decreases. The existing scheme of cascaded utilization of waste heat resources is unreasonable place. For example, the use of high-temperature cooling exhaust gas for energy conversion and power generation has large energy losses and low energy efficiency; using medium-temperature cooling exhaust gas for sintering ignition does not make the most of high-temperature cooling exhaust gas for sintering ignition, and high-quality energy—coal gas is not completely saved. (2) Only high and medium temperature (above 300°C) exhaust gas waste heat resources are recovered, and low-temperature waste heat resources are used for hot air sintering, and more low-temperature waste heat resources are wasted, lacking suitable technology and not being recycled, and the recovery efficiency is low; (3) After the recovery of low-temperature waste heat, only domestic hot water is considered for bathing. Due to the small number of hot water users, the recovery of low-temperature waste heat is limited.

Contents of the invention

In view of the defects in the prior art, the object of the present invention is to provide a system for recovering and utilizing sintering waste heat resources step by step.

A system for step-by-step recovery and cascade utilization of sintering waste heat resources according to the present invention is characterized in that it includes: a cooling subsystem and a cascade utilization subsystem of waste heat resources;

The cascade utilization subsystem of waste heat resources includes a hot air utilization device, and/or a medium-pressure steam utilization device, and/or a low-pressure steam utilization device, and/or a heat medium utilization device;

The cooling subsystem includes: annular cooler, waste heat hood, high pressure superheater, waste heat boiler, low pressure superheater, heat medium heat exchanger;

The annular cooler includes a high-temperature cooling section and a low-temperature cooling section, the high-temperature cooling section discharges high-temperature exhaust gas with a temperature higher than or equal to 300°C, and the low-temperature cooling section discharges low-temperature exhaust gas with a temperature lower than 300°C;

At least one waste heat hood is arranged in the high-temperature cooling section, and the gas outlet of the waste heat hood is respectively connected to the air inlet of the waste heat boiler and the hot air utilization device, so that the high-temperature exhaust gas passes through the waste heat hood One part directly enters the cascade utilization subsystem of waste heat resources, and the other part enters the waste heat boiler. The high-pressure superheater is installed in the waste heat hood, and the output end of the high-pressure superheater is connected with the medium-pressure steam utilization connected to the device;

The air outlet of the waste heat boiler is respectively connected to the air inlet of the hot air utilization device and/or the annular cooler, the low pressure superheater is installed in the waste heat boiler, the output end of the low pressure superheater is connected to the low pressure The steam utilization device is connected;

At least one heat medium heat exchanger is arranged in the low-temperature cooling section, the flue gas outlet of the heat medium heat exchanger is connected to the hot air utilization device, and the heat medium delivery pipe in the heat medium heat exchanger is connected to the The heat medium utilization device is connected.

As an optimization scheme, it also includes deaerator and high-pressure steam drum;

The waste heat hood is also provided with a high-pressure evaporator; the waste heat boiler is also provided with a hot water heater and a high-pressure economizer;

One end of the hot water heater is connected to pure water through a condensate pump, and the other end is connected to the deaerator, and the deaerator is also connected to the high-pressure economizer through a boiler feed pump. The water after thermal deoxygenation is pumped into the high-pressure economizer by the boiler feed water pump, and the output end of the high-pressure economizer is connected to the high-pressure steam drum;

The high-pressure steam drum is respectively connected with the high-pressure evaporator and the high-pressure superheater, and the water in the high-pressure steam drum enters the high-pressure evaporator, is heated and evaporated into high-pressure steam, and then returns to the high-pressure steam drum. The high-pressure steam enters the high-pressure superheater for superheating and then enters the medium-pressure steam utilization device.

As an optimized solution, a low-pressure evaporator is also provided in the waste heat boiler; the low-pressure evaporator is arranged between the hot water heater and the low-pressure superheater;

The water inlet of the low-pressure evaporator is connected to the deaerator, and the gas outlet is connected to the deaerator and/or the low-pressure steam utilization device;

The water in the deaerator enters the low-pressure evaporator, and the low-pressure steam formed by heating and evaporating enters the deaerator for oxygen removal, and/or enters the low-pressure steam utilization device.

As an optimized solution, the hot water heater, low-pressure superheater, and high-pressure economizer are sequentially arranged in the waste heat boiler from the air outlet to the air inlet.

As an optimized solution, the heat medium inlet of the heat medium heat exchanger is also connected to the deaerator through a monitoring valve assembly; the monitoring valve assembly includes a pressure sensing controller, a water adding valve, and a return valve;

The water adding valve is arranged between the boiler feed water pump and the high-pressure economizer;

When the pressure sensing controller detects that the pressure of the heat medium inlet is lower than a first preset value, the water filling valve is controlled to open, so that the boiler feed water pump pumps part of the water drawn from the deaerator into the heat medium heat exchanger, and

When it is detected that the pressure of the heat medium inlet is higher than a second preset value, the return valve is controlled to open, so that the water in the heat medium delivery pipeline flows back into the deaerator.

As an optimized solution, the medium-pressure steam utilization device includes a turbogenerator; the medium-pressure steam at the output end of the high-pressure superheater is connected to the turbogenerator as main steam, and the steam after power generation is pushed through a condensing The device condenses into pure water.

As an optimized solution, the low-pressure steam utilization device includes an intake steam turbine generator; the low-pressure steam is passed into the intake steam turbine generator as supplementary steam.

As an optimized solution, the high-temperature cooling section of the annular cooler is also connected to the sintering machine, and the high-temperature waste gas discharged from the high-temperature cooling section enters the sintering machine for ignition.

As an optimization scheme, the heat medium utilization device includes an organic working fluid Rankine cycle unit; an organic working fluid preheater is also provided upstream of the organic working fluid evaporator of the organic working fluid Rankine cycle unit; A part of the heat medium delivery pipeline is set in the organic working medium evaporator, and a part is set in the organic working medium preheater;

The temperature of the high-temperature heat medium output from the heat medium heat exchanger in the heat medium delivery pipeline and the organic working medium in the organic working medium evaporator is lowered after heat exchange, and the temperature of the lowered heat medium and the organic working medium The organic working medium in the preheater returns to the heat medium heat exchanger after heat exchange.

As an optimized solution, the hot air utilization device includes a sintering machine table.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The integrated arrangement of heat extraction from the waste heat smoke box and air cooling of the annular cooler improves heat exchange efficiency and even increases the recovery of sinter radiant heat; (2) Maximizes the recovery of sintering low-temperature waste heat through step-by-step recovery; ( 3) The use of multi-heat source ORC power generation technology increases the utilization channels of low-grade energy and improves the recovery rate; (4) Utilizes steam condensate water or heat medium waste heat after ORC power generation to perform refrigeration in the heat medium heat exchanger, replacing electric refrigeration; ( 5) By maximizing the efficiency of waste heat recovery, the energy consumption of the sintering process can be significantly reduced, energy can be saved, emissions can be reduced, and good economic and social benefits can be produced.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without any creative work. In the attached picture:

Figure 1 is an optional system structure diagram of step-by-step recovery and step-by-step utilization of sintering waste heat resources.

The figure includes: annular cooler 101; waste heat hood 102; waste heat boiler 103; circulating fan 104; condensate pump 105; hot water heater 106; deaerator 107; low-pressure evaporator 108; low-pressure superheater 109; 110; high-pressure economizer 111; high-pressure evaporator 112; high-pressure steam drum 113; high-pressure superheater 114; steam turbine generator 115; steam condenser 116;

Heat medium heat exchanger 201201; induced draft fan 202; closed circulation water pump 203; organic working medium preheater 204; organic working medium evaporator 205; working medium pump 206; organic working medium cooler 207; organic working medium regenerator 208; turbine generator 209; organic cycle working medium 210; condensate pump 211; hot water refrigeration unit 212;

Pressure sensing controller 301; water filling valve 302; return valve 303.

detailed description

The present invention will be described in detail below in terms of specific embodiments in conjunction with the accompanying drawings. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It is to be noted that other embodiments may be utilized or structural and functional modifications may be made to the embodiments set forth herein without departing from the scope and spirit of the invention.

The purpose of the present invention is to combine the characteristics of sintering waste heat resources, and according to the idea of energy cascade utilization, the high-temperature sintering cooling exhaust gas at the front end is used for sintering ignition to save gas to the greatest extent. Gas is chemical energy and is also a high-quality energy source, so as to achieve high quality and high efficiency ;The remaining high-temperature cooling exhaust gas and medium-temperature cooling exhaust gas use traditional waste heat boilers (or steam turbines) for waste heat recovery steam (or steam turbine power generation); low-temperature cooling exhaust gas is further recovered to generate electricity by using the organic refrigerant Rankine cycle power generation technology to achieve sintering Waste heat resources are recovered step by step and utilized step by step, which greatly improves the recovery rate of sintering waste heat.

In order to achieve the above purpose, the present invention combines the characteristics of "quantity" and "quality" of waste heat resources from the perspective of the system, and according to the general idea of "measure heat, make best use of heat; temperature matching, cascade utilization", proposes a sintering waste heat A system of step-by-step recovery and step-by-step utilization of resources. In an embodiment of the system for step-by-step recovery and cascade utilization of sintering waste heat resources provided by the present invention, as shown in Figure 1, it includes: a cooling subsystem and a cascade utilization subsystem of waste heat resources;

The cascade utilization subsystem of waste heat resources includes a hot air utilization device, and/or a medium-pressure steam utilization device, and/or a low-pressure steam utilization device, and/or a heat medium utilization device;

The cooling subsystem includes: annular cooler 101, waste heat hood 102, high pressure superheater 114, waste heat boiler 103, low pressure superheater 109, heat medium heat exchanger;

The annular cooler 101 includes a high-temperature cooling section and a low-temperature cooling section, the high-temperature cooling section discharges high-temperature exhaust gas with a temperature higher than or equal to 300°C, and the low-temperature cooling section discharges low-temperature exhaust gas with a temperature lower than 300°C;

At least one waste heat hood 102 is arranged in the high temperature cooling section, and the gas outlet of the waste heat hood 102 is respectively connected to the air inlet of the waste heat boiler 103 and the hot air utilization device, so that the high temperature waste gas passes through the waste heat The rear part of the fume hood 102 directly enters the cascade utilization subsystem of waste heat resources, and the other part enters the waste heat boiler 103. The high-pressure superheater 114 is installed in the waste heat fume hood 102, and the output of the high-pressure superheater 114 The end is connected with the medium-pressure steam utilization device;

The air outlet of the waste heat boiler 103 is respectively connected to the air inlet of the hot air utilization device and/or the annular cooler 101, the low pressure superheater 109 is arranged in the waste heat boiler 103, and the output of the low pressure superheater 109 The end is connected with the low-pressure steam utilization device;

At least one heat medium heat exchanger is arranged in the low-temperature cooling section, the flue gas outlet of the heat medium heat exchanger is connected to the hot air utilization device, and the heat medium delivery pipe in the heat medium heat exchanger is connected to the The heat medium utilization device is connected.

As an embodiment, the system also includes a deaerator 107, a high-pressure steam drum 113;

The waste heat hood 102 is also provided with a high-pressure evaporator 112; the waste heat boiler 103 is also provided with a hot water heater 106 and a high-pressure economizer 111;

One end of the hot water heater 106 is connected to pure water through a condensate pump 105, and the other end is connected to the deaerator 107, and the deaerator 107 is also connected to the high-pressure economizer 111 through a boiler feed water pump 110, so The water after thermal deoxygenation in the deaerator 107 is pumped into the high-pressure economizer 111 by the boiler feed water pump 110, and the output end of the high-pressure economizer 111 is connected to the high-pressure steam drum 113;

The high-pressure steam drum 113 is connected to the high-pressure evaporator 112 and the high-pressure superheater 114 respectively, and the water in the high-pressure steam drum 113 enters the high-pressure evaporator 112 and is heated and evaporated into high-pressure steam before returning to the high-pressure steam drum. In the high-pressure steam drum 113, the high-pressure steam enters the high-pressure superheater 114 for superheating and then enters the medium-pressure steam utilization device.

As an example, the waste heat boiler 103 is also provided with a low-pressure evaporator 108; the low-pressure evaporator 108 is arranged between the hot water heater 106 and the low-pressure superheater 109;

The water inlet of the low-pressure evaporator 108 is connected to the deaerator 107, and the gas outlet is connected to the deaerator 107 and/the low-pressure steam utilization device;

The water in the deaerator 107 enters the low-pressure evaporator 108 and the low-pressure steam formed by heating and evaporating enters the deaerator 107 for deaeration, and/or enters the low-pressure steam utilization device.

As an example, the hot water heater 106, the low-pressure superheater 109, and the high-pressure economizer 111 are sequentially arranged in the waste heat boiler 103 from the gas outlet to the gas inlet.

As an example, the heat medium inlet of the heat medium heat exchanger is also connected to the deaerator 107 through a monitoring valve assembly; the monitoring valve assembly includes a pressure sensor controller 301, a water adding valve 302, a return valve 303;

The water adding valve 302 is arranged between the boiler feed water pump 110 and the high pressure economizer 111;

When the pressure sensing controller 301 detects that the pressure at the heat medium inlet is lower than a first preset value, it controls the water addition valve 302 to open, so that the water pumped by the boiler feed water pump 110 from the deaerator 107 partially injected into the heat medium heat exchanger, and

When it is detected that the pressure of the heat medium inlet is higher than the second preset value, the return valve 303 is controlled to open, so that the water in the heat medium delivery pipeline flows back into the deaerator 107 .

As an embodiment, the medium-pressure steam utilization device includes a turbo-generator 115; the medium-pressure steam at the output end of the high-pressure superheater 114 is connected to the turbo-generator 115 as main steam to push the generated steam It is condensed into pure water through a steam condenser 116. The medium-pressure steam utilization device can also be a heating pipeline for heating or generating electricity in the factory area. In this embodiment, the medium-pressure steam is used for heat supply or power generation in the plant according to the user's needs, and the low-pressure steam is not only used for thermal deoxygenation, but also can be used for power generation by the supplementary steam turbine. As an example, after power generation, the condensed water or heat medium can continue to be used for air conditioning and refrigeration, or enter the heating system for heating.

As an embodiment, the low-pressure steam utilization device includes an admission steam turbine generator 115; the low-pressure steam passes into the admission steam turbine generator 115 as supplementary steam.

As an example, the high-temperature cooling section of the annular cooler 101 is also connected to the sintering machine, and the high-temperature waste gas discharged from the high-temperature cooling section enters the sintering machine for ignition. The high-temperature exhaust gas is directly sent back for sintering ignition or sintering heat preservation, which reduces the fuel consumption of the sintering machine and saves energy and reduces emissions from the source.

The annular cooler 101 arranges the whole or part of the heat exchange equipment (waste heat smoke box, heat medium heat exchanger, etc.) above the annular cooler according to the space conditions to form an overall device and improve the heat exchange efficiency. The sintered ore in the ring cooler 101 forms segmented air cooling regions to obtain cooling exhaust gas at different temperatures.

Part of the high-temperature exhaust gas at 300-450°C is directly sent back to the sintering machine for ignition of the sintering machine to reduce fuel consumption of the sintering machine; the other part enters the waste heat hood 102 at the top of the ring cooler 101 to produce medium-pressure steam, and enters after heat exchange The waste heat boiler 103 below the annular cooler 101 is used to generate low-pressure steam for further cooling, and the cooled exhaust gas is led back to the annular cooler 101 by the circulating fan 104 to continue cooling the sinter.

The low-temperature waste gas below 300°C enters the top of the annular cooler 101 and enters the heat medium heat exchanger 201 to generate part of low-pressure steam and heat medium (such as high-pressure hot water), and the cooled waste gas is sent to the sintering machine table by the induced draft fan 202 It is used for hot air sintering to further reduce the fuel consumption of the sintering machine and save energy and reduce emissions from the source. In this embodiment, both the waste heat hood 102 and the waste heat boiler 103 are provided by a dual-pressure waste heat boiler, but the present invention is not limited thereto. The pure water is pressurized by the water pump 105 and sent to the hot water heater 106. After being heated by the cooling exhaust gas in the hot water heat exchanger 106, it enters the deaerator 107 (low-pressure steam drum), and is fed by the boiler feed water pump after thermal deaeration. 110 sends heat to the high-pressure economizer 111 to absorb heat and heat up, then enters the high-pressure steam drum 113, then enters the high-pressure evaporator 112 to be heated and evaporated into high-pressure steam, and then is overheated by the heater 114 to generate medium-pressure steam for use by lower-level users. A low-pressure evaporator 108 and a low-pressure superheater 109 are arranged between the hot water heat exchanger 106 and the high-pressure economizer 111, and part of the hot water in the deaerator 107 (low-pressure steam drum) is evaporated in the low-pressure evaporator 108 through gravity circulation. A part of the generated low-pressure steam is used for deoxygenation by the deaerator 107 (low-pressure steam drum), and another part of the low-pressure steam is heated by the low-pressure superheater 109 for use by lower-level users.

As an embodiment, the hot air utilization device includes a sintering machine table.

As an embodiment, the heat medium utilization device includes an organic working fluid Rankine cycle unit; an organic working fluid preheater 204 is also provided upstream of the organic working fluid evaporator 205 of the organic working fluid Rankine cycle unit; A part of the heat medium delivery pipeline is set in the organic working medium evaporator 205, and a part is set in the organic working medium preheater 204;

The temperature of the high-temperature heat medium output from the heat medium heat exchanger in the heat medium delivery pipeline and the organic working medium in the organic working medium evaporator 205 is reduced after heat exchange, and the temperature of the reduced heat medium and the organic working medium The organic working fluid in the mass preheater 204 returns to the heat medium heat exchanger after heat exchange. In this embodiment, ORC power generation technology is used to convert waste heat in low-temperature exhaust gas into high-grade electricity for use by users.

In this embodiment, the system with compact layout of heat recovery forms an efficient step-by-step recovery system, and recovers waste gas, medium-pressure steam, low-pressure steam, heat media (such as hot water, etc.). The heat extraction device (waste heat hood, waste heat boiler, heat medium heat exchanger) should be integrated with the ring cooler as much as possible. The heater heats the heat medium to form an integrated circular cooler with cooling and heat recovery at the same time. In the occasions where the post-retrofit conditions are not available, it should be as close as possible to the production process to reduce heat loss and improve recovery efficiency. The exhaust gas between 300-450°C is mainly used to produce medium-pressure steam and low-pressure steam, and the exhaust gas below 300°C can produce part of low-pressure steam or heat medium (hot water with pressure).

The medium-pressure steam generated by the high-pressure superheater 114 can directly enter the heat pipe network for external heating, or be used for steam turbine power generation. The medium-pressure steam generated by the high-pressure superheater 114 is used as the main steam of the turbo-generator 115 , drives the steam turbine to generate electricity, and is condensed into condensed water in the condenser 116 , heated by the condensed water pump 105 and sent back to the waste heat boiler 103 . The turbo-generator 115 can use a supplementary steam turbine to generate electricity, and the low-pressure steam generated by the waste heat boiler 103 is used as the supplementary steam of the turbo-generator 115 to increase the power generation of the system. The closed cycle hot water generated by the heat medium heat exchanger 201 is used as the heat source of the ORC unit to heat the organic working medium 210 in the organic working medium preheater 204 and the organic working medium evaporator 205, and the organic working medium 210 enters the The internal expansion of the turbine generator 209 drives the generator to output electric energy. After passing through the turbine generator 209, the organic vapor discharged from the cooling and pressure reduction enters the organic working medium regenerator 208, and the low-temperature gas from the regenerator 208 enters the condenser 207 to be Condensed into a liquid organic working fluid, the liquid organic working fluid is boosted by the working fluid pump 206 and enters the preheater 204 to be heated again.

The heat medium delivery pipeline forms a closed circulating water system. In order to ensure that the closed circulating water is not completely vaporized when the heat medium heat exchanger 201 is overheated (>100°C), it is installed at the heat medium inlet of the heat medium heat exchanger. The closed circulating water pump 203 uses the water pressure at the outlet of the boiler feed water pump 110 to set a monitoring valve assembly as a constant pressure device at the inlet of the closed circulating water pump 203 . The monitoring valve assembly includes a pressure sensing controller 301 , a water filling valve 302 , and a return valve 303 . When the pressure detected by the pressure sensing controller 301 is lower than the set value, the water filling valve 302 is used to inject water into the closed circulating water system by the boiler feed water pump 107 to pressurize it; when the pressure detected by the pressure sensing controller 301 is higher than When the value is set, the return valve 303 is opened, and the water in the heat medium delivery pipeline flows back into the deaerator 107 (low-pressure steam drum). The low-pressure steam generated by the waste heat boiler 103 can be used as an ORC heat source at the same time, and the organic working medium is heated in the evaporator 205 of the ORC unit to increase the power generation of the ORC unit. The hot water refrigerating unit 212 is used as its driving heat source to generate cold energy for cold users or directly sent to hot users by condensate pumps. The steam condenser 116 and the organic working medium cooler 207 can be cooled by air cooling or water cooling, or directly use an evaporative cooling device.

The above descriptions are only preferred embodiments of the present invention, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, the features and examples may be modified to adapt a particular situation and material to the teachings of the invention without departing from the spirit and scope of the invention. Therefore, the present invention is not limited by the specific embodiments disclosed here, and all embodiments falling within the scope of the claims of the present application belong to the protection scope of the present invention.

Claims (10)

1. a sintering waste heat resource reclaims the system with cascade utilization step by step, it is characterised in that including: cooling System and residual heat resources cascade utilization subsystem；

Described residual heat resources cascade utilization subsystem include hot blast utilize device and/or middle pressure steam utilize device and/or Low-pressure steam utilizes device and/or heating agent to utilize device；

Described cooling subsystem includes: central cooler, waste heat petticoat pipe, high-pressure superheater, waste heat boiler, low-pressure superheater, Heating-medium heat exchanger；

Described central cooler includes that high temperature cooling section and sub-cooled section, described high temperature cooling section discharge temperature are greater than or equal to The high-temp waste gas of 300 DEG C, the described sub-cooled section discharge temperature low temperature waste gas less than 300 DEG C；

At least one described waste heat petticoat pipe is arranged on described high temperature cooling section, and the gas outlet of described waste heat petticoat pipe connects institute respectively Air inlet and the described hot blast of stating waste heat boiler utilize device so that high-temp waste gas is straight through described waste heat petticoat pipe rear portion Tapping into into described residual heat resources cascade utilization subsystem, another part enters described waste heat boiler, sets in described waste heat petticoat pipe There is described high-pressure superheater, and the outfan of described high-pressure superheater is connected with medium pressure steam utilization apparatus；

The gas outlet of described waste heat boiler is respectively connecting to described hot blast and utilizes the air inlet of device and/or central cooler, described remaining Being provided with described low-pressure superheater in heat boiler, the outfan of described low-pressure superheater utilizes device to be connected with described low-pressure steam；

At least one described heating-medium heat exchanger is arranged on described sub-cooled section, and the exhanst gas outlet of described heating-medium heat exchanger connects Utilizing device to described hot blast, the heating agent conveyance conduit in described heating-medium heat exchanger utilizes device to be connected with described heating agent.

System the most according to claim 1, it is characterised in that also include oxygen-eliminating device, HP steam drum；

Described waste heat petticoat pipe is additionally provided with high pressure evaporator；Be additionally provided with hot-water heater in described waste heat boiler, high pressure saves coal Device；

Pure water is accessed by condensate pump in described hot-water heater one end, and another terminates described oxygen-eliminating device, and described oxygen-eliminating device is the most logical Crossing boiler feed pump to be connected with described high-pressure economizer, in described oxygen-eliminating device, the water after thermal de-aeration is given by described boiler In water pump extraction extremely described high-pressure economizer, the outfan of described high-pressure economizer is connected to described HP steam drum；

Described HP steam drum is connected with described high pressure evaporator and described high-pressure superheater respectively, the water in described HP steam drum Being heated after entering described high pressure evaporator after being evaporated to high steam and be back in described HP steam drum, described high steam enters Enter the overheated rear entrance medium pressure steam utilization apparatus of described high-pressure superheater.

System the most according to claim 2, it is characterised in that be additionally provided with low pressure evaporator in described waste heat boiler； Described low pressure evaporator is located between described hot-water heater and described low-pressure superheater；

The water inlet of described low pressure evaporator is connected with described oxygen-eliminating device, gas outlet and described oxygen-eliminating device and/described low-pressure steam Device is utilized to be connected；

The low-pressure steam that the water described low pressure evaporator of entrance in described oxygen-eliminating device is formed by thermal evaporation enters in described oxygen-eliminating device Carry out deoxygenation, and/or enter described low-pressure steam and utilize device.

System the most according to claim 2, it is characterised in that described hot-water heater, low-pressure superheater, height Pressure economizer is set in turn in described waste heat boiler from gas outlet to air inlet.

System the most according to claim 2, it is characterised in that the heating agent entrance of described heating-medium heat exchanger also by Monitoring valve member is connected with described oxygen-eliminating device；Described monitoring valve member includes pressure sensing controller, priming valve, returns Stream valve；

Described priming valve is arranged between described boiler feed pump and described high-pressure economizer；

Described pressure sensing controller adds described in controlling when the pressure described heating agent entrance being detected is less than the first preset value Water valve is opened so that the water section that described boiler feed pump extracts from oxygen-eliminating device injects in described heating-medium heat exchanger, and

Control described reflux inlet when the pressure described heating agent entrance being detected is higher than the second preset value to open so that described heat Water in matchmaker's conveyance conduit is back in described oxygen-eliminating device.

System the most according to claim 1, it is characterised in that medium pressure steam utilization apparatus includes that steamer is sent out Motor；The middle pressure steam of the outfan of described high-pressure superheater accesses described steam turbine generator as main steam, promotes generating After steam be condensed into pure water through a condenser.

7. according to the system described in claim 1 or 3 or 6, it is characterised in that described low-pressure steam utilizes device bag Include filling formula steam turbine generator；Described low-pressure steam is passed through described filling formula steam turbine generator as filling.

System the most according to claim 1, it is characterised in that the high temperature cooling section of described central cooler also with sintering Machine is connected, and the high-temp waste gas that described high temperature cooling section is discharged enters in described sintering machine and lights a fire.

System the most according to claim 1, it is characterised in that described heating agent utilize device to include organic working medium is bright It agree Cycle Unit；It is pre-that the upstream of the organic working medium vaporizer of described organic rankie cycle unit is additionally provided with an organic working medium Hot device；A part for described heating agent conveyance conduit is arranged in described organic working medium vaporizer, a part be arranged at described in have Machine working medium preheater；

From high temperature heating agent and the having in described organic working medium vaporizer of heating-medium heat exchanger output in described heating agent conveyance conduit After machine working medium carries out heat exchange, temperature reduces, and the heating agent after temperature reduces enters with the organic working medium in described organic working medium preheater Described heating-medium heat exchanger is returned after row heat exchange.

System the most according to claim 1, it is characterised in that described hot blast utilizes device to include sintering machine table top.