CN110360570A - A kind of TDI coke burn before pretreatment system - Google Patents

Abstract

The invention discloses a pretreatment system before TDI coke incineration, which includes a discharge part, a grinding part and a pneumatic conveying part. The unloading part includes unloading hopper, primary pulverizer and TDI coke silo. The grinding part includes a secondary pulverizer, a grinder, a cyclone separator, a hopper, a bag filter and a primary fan. The suction port of the primary fan is connected to the clean air outlet of the bag filter. Burner connection for vertical liquid waste incinerator; pneumatic conveying section includes two Venturi injectors. The inlets of the two Venturi injectors are connected with the outlet of the hopper and the ash outlet of the bag filter one by one, and the power source is provided by the Roots blower; the outlets of the two Venturi injectors are connected with the Nozzle connections for vertical liquid waste incinerators. The pretreatment system of the invention can realize the incineration of TDI coke in the vertical waste liquid incinerator, and can make the residue and flue gas produced by incineration reach the standard.

Description

A pretreatment system before TDI coke incineration

technical field

The invention relates to hazardous waste treatment equipment, in particular to a pretreatment system before TDI coke incineration.

Background technique

TDI is the abbreviation of toluene diisocyanate. It is one of the main raw materials of polyurethane plastics. value product. However, a certain amount of coke (tar residue or tar powder) will be produced in the TDI production process, accounting for 2% to 8% of the TDI production capacity, and the main component is polyisocyanate. Usually TDI coke is treated by incineration process, however, tar residue will produce a large amount of carbon oxides, nitrogen oxides and smoke during the combustion process, these gases will corrode the incinerator and flue, and will cause environmental damage when discharged into the atmosphere Certain hazards. At present, before processing TDI coke, it needs to be processed by the grinder system before being sent to the rotary kiln for incineration. Due to the change of the waste market and the increase of solid waste, the existing TDI coke treatment process occupies more of the total amount of coke incineration in the rotary kiln, and for the vertical waste liquid incinerator, due to the reduction of liquid waste, it often fails to meet the design In order to use the vertical waste liquid incinerator to incinerate TDI coke, it is necessary to pretreat TDI coke first. If it directly enters the vertical waste liquid incinerator without pretreatment, it will have a great impact on the production capacity of the vertical waste liquid incinerator and the subsequent flue gas discharge temperature.

Contents of the invention

The purpose of the present invention is to overcome the defects of the prior art and provide a pretreatment system before the incineration of TDI coke, which can realize the incineration of TDI coke in the vertical waste liquid incinerator, and can make the residue produced by incineration and smoke compliance.

The object of the present invention is achieved like this: a kind of pretreatment system before TDI coke incineration, comprises unloading part, grinding part and pneumatic conveying part;

The discharge part includes a discharge hopper, a primary pulverizer and a TDI coke silo, wherein,

The outlet of the discharge hopper is connected to the feed port of an apron feeder;

The feed port of the primary pulverizer is connected to the discharge port of the apron feeder;

The feed port of the TDI coke silo is connected to the discharge port of the primary pulverizer, and the discharge port of the TDI coke silo is connected to the inlet of the first screw conveyor;

The grinding part includes a secondary pulverizer, a grinder, a cyclone separator, a hopper, a bag filter and a primary air blower, wherein,

The feed inlet of the secondary pulverizer is connected with the outlet of the first screw conveyor, and the discharge port of the secondary pulverizer is connected with the inlet of the second screw conveyor;

The bottom of the grinder is provided with a feed port and a vent; the feed port is connected with the outlet of the second screw conveyor; the vent is connected with the exhaust port of a circulating fan; the grinder The upper part has a sorter;

The upper part of the cyclone separator is radially provided with an air inlet, the top is provided with an air outlet, and the lower end is provided with a powder outlet; the air inlet is connected with the outlet of the classifier of the grinder; The gas port is connected with the suction port of the circulating fan through a pipeline;

The inlet of the hopper is connected to the powder outlet of the cyclone separator, and the outlet of the hopper is connected to the inlet of the third screw conveyor;

The bag filter is a pulse bag filter, and its dusty gas inlet is connected to the air outlet of the circulating fan;

The air suction port of the primary air fan is connected with the clean air outlet of the bag filter, and the air exhaust port of the primary air fan is connected with the burner of the vertical waste liquid incinerator;

The pneumatic conveying section includes two venturi injectors, wherein,

The feed inlets of the two Venturi ejectors are connected with the outlet of the third screw conveyor and the ash discharge port of the bag filter one by one, and the power gas source of the two Venturi ejectors is provided by a Roots blower. Provided; the outlets of the two Venturi injectors are connected to the nozzles of the vertical waste liquid incinerator through pneumatic conveying pipes.

In the above-mentioned pretreatment system before coke incineration of TDI, a first iron remover is arranged at the end of the apron feeder.

The above-mentioned pretreatment system before TDI coke incineration, wherein, the discharge part also includes a bucket elevator connected between the discharge port of the primary pulverizer and the feed port of the TDI coke silo machine.

The above-mentioned pretreatment system before TDI coke incineration, wherein a weighing device, a dust collector and a dust removal fan are installed in the TDI coke silo.

The above-mentioned pretreatment system before TDI coke incineration, wherein, the outlet of the secondary pulverizer is connected to the inlet of the second screw conveyor through the second iron remover, and the outlet of the second screw conveyor is connected through A first rotary valve is connected to the feed port of the grinder.

The above-mentioned pretreatment system before TDI coke incineration, wherein, the powder outlet of the cyclone separator is connected with the inlet of the hopper through a second rotary valve.

The above-mentioned pretreatment system before TDI coke incineration, wherein, the feed ports of the two Venturi injectors pass through the third rotary valve and the fourth rotary valve in one-to-one correspondence with the outlet of the third screw conveyor And the ash outlet of the bag filter.

The technical scheme of the processing system of TDI coke of the present invention has the following characteristics:

1. It integrates unloading, mechanical conveying, multi-stage crushing and grinding, and pneumatic conveying into one unit, and efficiently connects the link between waste entering the factory and terminal disposal.

2. By homogenizing the particle size of the material, it is not only convenient for material transportation, but also realizes the incineration of TDI coke in the vertical waste liquid incinerator, and can fully burn the material, so that the residue and flue gas produced by incineration can reach the standard. Finally, the vertical waste liquid incinerator can be fully utilized.

Description of drawings

Fig. 1 is a structural schematic diagram of the pretreatment system before TDI coke incineration according to the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

Please refer to Fig. 1, the pretreatment system before TDI coke incineration of the present invention includes a discharge part, a grinding part and a pneumatic conveying part.

The discharge part includes a discharge hopper 1, an apron feeder 2, a first iron remover 3, a primary pulverizer 4, a bucket elevator 5, a TDI coke silo 6 and a first screw conveyor 7, wherein,

The discharge hopper 1 is arranged at the mouth of the pit 100 in the discharge workshop, and the outlet at the lower end of the discharge hopper 1 is connected to the feed port of the apron feeder 2;

The apron feeder 2 is located in the pit 100 and below the discharge hopper 1, and the feed inlet of the apron feeder 2 is connected to the outlet of the discharge hopper 1;

The first iron remover 3 is arranged at the end of the apron feeder 2;

The primary pulverizer 4 is arranged below the first iron remover 3, and the feed port of the primary pulverizer 4 is connected to the discharge port of the first iron remover 3;

The lower part of the bucket elevator 5 is located in the pit 100, and the lower end of the bucket elevator 5 is connected to the discharge port of the primary pulverizer 4;

The TDI coke silo 6 is located above the pit 100, and the feed port of the TDI coke silo 6 is connected to the upper end of the bucket elevator 5; Fan 62 and weighing device, and dust collector 61 are equipped with a back-blowing self-cleaning system; the outlet of the TDI coke silo 6 is connected to the inlet of the first screw conveyor 7 .

The grinding part includes a secondary pulverizer 8, a second iron remover 9, a second screw conveyor 10, a grinder 12, a circulating fan 13, a cyclone separator 14, a hopper 16, a third screw conveyor 17, and a bag filter 19 , primary air blower 21 and three fire extinguishers 130, wherein,

The feed inlet of the secondary pulverizer 8 is connected with the outlet of the first screw conveyor 7;

The second iron remover 9 is arranged at the discharge port of the secondary pulverizer 8;

The inlet of the second screw conveyor 10 is connected to the outlet of the second iron remover 9, and the outlet of the second screw conveyor 10 is connected to the first rotary valve 11;

The bottom of the grinder 12 is provided with a feed port and a vent; the feed port of the grinder 12 is connected with the outlet of the first rotary valve 11; the vent of the grinder 12 is connected with the exhaust port of the circulating fan 13; The upper part of the machine 12 has a sorter 120;

The top of the cyclone separator 14 is radially provided with an air inlet 141, the top is provided with an air outlet 142, and the lower end is provided with a powder outlet 143; the air inlet 141 is connected with the outlet of the classifier 120 of the grinder 12; The port 142 is connected to the suction port of the circulating fan 13 through a pipeline; the powder outlet 143 is connected to a second rotary valve 15;

The inlet of the hopper 16 is connected with the outlet of the second rotary valve 15, and the outlet of the hopper 16 is connected with the inlet of the third screw conveyor 17; the outlet of the third screw conveyor 17 is connected with the third rotary valve 18;

The bag filter 19 is a pulse bag filter, and its dusty gas inlet 191 is connected to the exhaust outlet of the circulating fan 13, and the ash outlet of the bag filter 19 is connected to the fourth rotary valve 20;

The primary air blower 21 is a variable frequency blower, and the air suction port of the primary air blower 21 is connected with the clean air outlet 192 of the bag filter 19, and the air outlet of the primary air blower 21 is connected with the burner of the vertical waste liquid incinerator. The suction port of fan 23 is connected;

Three fire extinguishers 130 are all connected on the air vent of grinder 12, facilitate

The pneumatic conveying part includes two Venturi injectors 22a, 22b, wherein,

The feed ports of the two Venturi injectors 22a, 22b are connected to the outlet of the third rotary valve 18 and the outlet of the fourth rotary valve 20 one by one, and the motive gas source of the two Venturi injectors 22a, 22b is provided by Roots blower 220 is provided; the outlets of the two Venturi injectors 22a, 22b are connected to the nozzles of the vertical waste liquid incinerator through pneumatic conveying pipelines.

The pretreatment system before TDI coke incineration of the present invention, when working, TDI coke is transported in the unloading workshop by dump truck 1a, puts in the unloading hopper 1 of pit 100, and the discharge hopper 1 The top is equipped with a horizontal grill to prevent operators from falling into the discharge hopper 1. The discharge hopper 1 is equipped with an electric vibration mechanism to avoid material bridging. The TDI coke raw material is discharged from the discharge port of the discharge hopper 1 and then transported to the primary crusher 4 at a fixed flow rate by the apron feeder 2 for the first crushing to ensure that the particle size of the TDI coke is less than 30mm. Since the first iron remover 3 is installed at the end of the apron feeder 2, large ferromagnetic objects (screws, etc.) that may appear together with TDI coke are separated. The TDI coke crushed by a crusher will enter the bucket elevator 5, and enter the TDI coke bin 6 through the bucket elevator 5; the weighing device in the TDI coke bin 6 can be used to monitor the TDI coke in the bin. Carbon storage capacity; when the bucket elevator 5 is running, the dust collector 61 and the dust removal fan 62 in the TDI coke silo 6 are automatically started.

The discharge port at the lower end of the TDI coke silo 6 is sent to the secondary crusher 8 through the first screw conveyor 7 for second crushing to ensure that the particle size of the TDI coke is less than 20 mm. The first screw conveyor 7 has a frequency control function, which can adjust the flow into the secondary crusher 8 to the required flow. The secondary crushed TDI coke particles pass through the second iron remover 9 to remove iron that may cause sparks inside the grinder 12 ; and then are transported to the first rotary valve 11 by the second screw conveyor 10 . The second screw conveyor 10 feeds TDI coke particles into the grinder 12 at a fixed feed rate, and the flow rate of the second screw conveyor 10 is determined by the flow rate of the first screw conveyor 7 . The grinder 12 grinds the TDI coke particles into fine powders with different particle sizes during the rotating motion, and the classifier 120 provided with the grinder 12 only allows the powder particles smaller than the desired particle size to leave the grinder 12 . The air generated by the circulating fan 13 sends the TDI coke powder into the cyclone separator 14 through the air inlet 141 of the cyclone separator 14 . The heavier TDI coke powder is separated from the circulating air flow by the cyclone separator 14 and falls into the hopper 16, which also acts as a buffer; the mixture of the lighter TDI coke powder and air is returned to the circulation fan 13 by the pipeline The air suction port is sent to the bag filter 19 by the circulating fan 13, and collected by the ash hopper of the bag filter 19. The air purified by the bag filter 19 is sent to the upstream of the combustion fan 23 of the vertical waste liquid incinerator through the primary air blower 21, as the combustion air of the burner of the vertical waste liquid incinerator. The amount of air extracted from the bag filter 19 depends on parameters such as the moisture content of the TDI coke, and will be adjusted according to the frequency change of the primary air fan 21 during the commissioning process.

The outlet of the hopper 16 below the cyclone separator 14 and the ash outlet 193 of the bag filter 19 correspond to each other to send TDI coke powder into the two Venturi injectors through the third rotary valve 18 and the fourth rotary valve 20 22a, 22b, and connected to the pneumatic conveying pipeline via two Venturi injectors 22a, 22b to ensure that there is no backflow. Therefore, the TDI coke powder in the hopper 16 and the TDI coke powder collected by the ash hopper of the bag filter 19 are sent to the spray gun of the vertical waste liquid incinerator through the pneumatic conveying pipeline, and sprayed into the vertical waste liquid incinerator by the spray gun combustion.

The control console is installed outside the unloading workshop, which can immediately start or stop the unloading, conveying and crushing of TDI coke. An emergency shutdown system is set outside the unloading workshop and in the pit 100 .

The pretreatment system before the TDI coke incineration of the present invention has the following characteristics:

1. It integrates unloading, mechanical conveying, multi-stage crushing and grinding, and pneumatic conveying into one unit, and efficiently connects the link between waste entering the factory and terminal disposal.

2. By homogenizing the particle size of the material, it is not only convenient for material transportation, but also realizes the incineration of TDI coke in the vertical waste liquid incinerator, and can fully burn the material, so that the residue and flue gas produced by incineration can reach the standard. Finally, the vertical waste liquid incinerator can be fully utilized.

The above embodiments are only for the purpose of illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can also make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent The technical solutions should also belong to the category of the present invention and should be defined by each claim.

Claims (7)

1. a pretreatment system before TDI coke incineration, comprising unloading part, grinding part and pneumatic conveying part; It is characterized in that, The discharge part includes a discharge hopper, a primary pulverizer and a TDI coke silo, wherein, The outlet of the discharge hopper is connected to the feed port of an apron feeder; The feed port of the primary pulverizer is connected to the discharge port of the apron feeder; The feed port of the TDI coke silo is connected to the discharge port of the primary pulverizer, and the discharge port of the TD I coke silo is connected to the inlet of the first screw conveyor; The grinding part includes a secondary pulverizer, a grinder, a cyclone separator, a hopper, a bag filter and a primary air blower, wherein, The feed inlet of the secondary pulverizer is connected with the outlet of the first screw conveyor, and the discharge port of the secondary pulverizer is connected with the inlet of the second screw conveyor; The bottom of the grinder is provided with a feed port and a vent; the feed port is connected with the outlet of the second screw conveyor; the vent is connected with the exhaust port of a circulating fan; the grinder The upper part has a sorter; The upper part of the cyclone separator is radially provided with an air inlet, the top is provided with an air outlet, and the lower end is provided with a powder outlet; the air inlet is connected with the outlet of the classifier of the grinder; The gas port is connected with the suction port of the circulating fan through a pipeline; The inlet of the hopper is connected to the powder outlet of the cyclone separator, and the outlet of the hopper is connected to the inlet of the third screw conveyor; The bag filter is a pulse bag filter, and its dusty gas inlet is connected to the air outlet of the circulating fan; The air suction port of the primary air fan is connected with the clean air outlet of the bag filter, and the air exhaust port of the primary air fan is connected with the burner of the vertical waste liquid incinerator; The pneumatic conveying section includes two venturi injectors, wherein, The feed inlets of the two Venturi ejectors are connected with the outlet of the third screw conveyor and the ash discharge port of the bag filter one by one, and the power gas source of the two Venturi ejectors is provided by a Roots blower. Provided; the outlets of the two Venturi injectors are connected to the nozzles of the vertical waste liquid incinerator through pneumatic conveying pipes. 2. The pretreatment system before TDI coke incineration according to claim 1, characterized in that a first iron remover is arranged at the end of the apron feeder. 3. the pretreatment system before the TDI coke incineration according to claim 1, is characterized in that, described unloading part also comprises a discharge opening and TDI coke silo that are connected in described primary pulverizer The bucket elevator between the feeding ports. 4. according to the pretreatment system before the TDI coke incineration described in claim 1 or 2, it is characterized in that weighing device, deduster and dedusting blower fan are installed in described TDI coke feed bin. 5. the pretreatment system before TDI coke incineration according to claim 1 is characterized in that, the outlet of described secondary pulverizer is connected with the inlet of described second screw conveyor by the second iron remover , the outlet of the second screw conveyor is connected with the feed inlet of the grinder through a first rotary valve. 6. The pretreatment system before TDI coke incineration according to claim 1 is characterized in that, the powder outlet of the cyclone separator is connected with the inlet of the hopper through a second rotary valve. 7. the pretreatment system before TDI coke incineration according to claim 1 is characterized in that, the inlet of two described Venturi injectors passes through the 3rd rotary valve and the 4th rotary valve one by one correspondingly It is connected with the outlet of the third screw conveyor and the ash outlet of the bag filter.