CN102564129B - Controllable and adjustable drop tube furnace device and use method of same - Google Patents

Abstract

The invention belongs to combustion experiment furnace equipment, in particular to a controllable and adjustable dropper furnace device and a use method. Insert two or more feed channels that can move up and down in the furnace in a conventional solid fuel dropper furnace. The combustion-supporting dose introduced is 10-30% of the total combustion-supporting dose of the furnace; the outlet of the channel is designed as a nozzle structure, and the nozzle is a multi-hole nozzle with a divergent effect, and the inner diameter of the injection hole of the nozzle is 0.5-3 mm; Cooling channel, cooling water is passed into the cooling channel as the cooling medium; through the free movement of the feeding channel in the furnace up and down and the adjustment of the amount of substances in the channel, the generation and concentration changes of combustion products and pollutants in the furnace are controlled and adjusted.

Description

A controllable and adjustable dropper furnace device and its use method

technical field

The invention belongs to combustion experiment furnace equipment, in particular to a controllable and adjustable dropper furnace device and a use method.

Background technique

The dropper furnace is a common device for mechanism experiments with fuels such as coal powder and biomass. The fuel undergoes a one-dimensional combustion reaction in the furnace. The device is relatively simple, easy to control the temperature, has a high heating rate, and can realize continuous feeding, and can easily understand the combustion and emission characteristics of the fuel. The conventional dropper furnace mainly has fuel inlet, air inlet and smoke and ash outlet, and there are few adjustable parameters. In reality, boilers and other combustion equipment basically have multiple fuel or air channels. The changes in the different spatial positions of these channels have an important impact on the aerodynamic field and concentration field in the combustion, which has a great impact on combustion and pollutant control. . Therefore, the simple one-dimensional reaction in the dropper furnace is difficult to reflect the real situation.

In addition, the combustion reaction requires a certain amount of time. The fuel enters the furnace and generally goes through stages such as preheating, diffusion, and reaction. However, due to the small size of the dropper furnace, the residence time of the fuel in it is generally short. If the fuel enters the furnace, it can quickly mix and react with the combustion aid, which is beneficial to the combustion and burnout in the furnace.

Contents of the invention

The object of the present invention is to provide a dropper furnace device and a using method that can control and adjust the variation of fuel and combustion accelerant.

The technical scheme adopted in the present invention is:

The furnace body of the dropper furnace is a cylinder, the top surface of which is provided with the inlet of the dropper furnace, and the bottom surface is provided with the outlet of the dropper furnace; two or more feed channels that can move up and down pass through the top surface of the dropper furnace body, It extends into the hearth of the dropper furnace and is used as a fuel feed channel and a combustion aid feed channel respectively;

The feeding channel is a three-layer pipeline structure, the innermost layer is the feeding channel, which is connected to the outside world through the inlet of the feeding channel; the outer two layers are cooling water channels, and the cooling water channel in the middle layer is connected to the outside world through the cooling water inlet. The cooling water channel in the outer layer is connected with the outside world through the cooling water outlet; the lower end of the feeding channel is provided with a fan-shaped feeding channel spray head in longitudinal section, and a plurality of spray holes are provided on the surface.

The inner diameter of the injection hole is 0.5-3 mm, and the included angle between the injection direction of the injection hole and the vertical direction is 0-85°.

The feed channel and the furnace body of the dropper furnace are screwed together.

The using method of the dropper furnace device provided by the present invention is as follows: the feed channel is divided into a fuel feed channel and a combustion aid feed channel, and the fuel is solid fuel, liquid fuel or gaseous fuel; the fuel fed into the fuel feed channel The amount is 10-30% of the total heat load of the dropper furnace furnace, and the combustion-supporting dose introduced into the combustion-supporting agent feeding channel is 10-30% of the total combustion-supporting dose of the dropper furnace furnace; Freely move up and down and adjust the change of the amount of substances in the channel, control and adjust the generation and concentration changes of combustion products and pollutants in the furnace.

The solid fuel includes pulverized coal and biomass, and the liquid and gaseous fuels include oil, natural gas or carbon-containing energy liquefied or gasified liquid or gaseous fuel.

The feeding channel is heated by a heating device outside the dropper furnace device to increase the temperature at which the fuel or combustion accelerant in the channel enters the hearth of the dropper furnace.

The beneficial effects of the present invention are:

Compared with the conventional dropper furnace, the dropper furnace of the present invention realizes the controllable adjustment of the amount of fuel in the furnace and the amount of combustion-supporting agent, and at the same time, the nozzle design of the fuel passage and the combustion-supporting agent passage strengthens the material in the passage and the content of the dropper furnace. With the fast mixing of main combustion fuel and air, the drip tube furnace can more accurately reflect the actual combustion process.

Description of drawings

Fig. 1 is the schematic diagram of dropper furnace structure;

Fig. 2 is the structural representation of feed channel;

Fig. 3 is a schematic diagram of the feed channel nozzle.

Labels in the figure:

1-Drop tube furnace hearth, 2-Drip tube furnace body, 3-Drop tube furnace inlet, 4-Drop tube furnace outlet, 5-Fuel feed channel, 6-Auxiliary feed channel, 71-Feed channel inlet , 72-cooling water inlet, 73-cooling water outlet, 74-feed channel nozzle, 75-spray hole.

Detailed ways

The present invention provides a controllable and adjustable burette furnace device and its use method. The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

The structure of the dropper furnace is shown in Figure 1, the dropper furnace body 2 is a cylinder, the top surface is provided with a dropper furnace inlet 3, and the bottom surface is provided with a dropper furnace outlet 4; two or more can move up and down The feed channel passes through the top surface of the dropper furnace furnace body 2 and extends into the hearth 1 of the dropper furnace, and is used as the fuel feed channel 5 and the combustion aid feed channel 6 respectively. The feed channel and the dropper furnace body 2 are threaded.

The structure of the feed channel is shown in Figure 2. The feed channel is a three-layer pipeline structure, the innermost layer is the feed channel, which is connected to the outside world through the feed channel inlet 71; the outer two layers are cooling water channels, and the middle layer The cooling water channel is connected to the outside world through the cooling water inlet 73 , and the outermost cooling water channel is connected to the outside world through the cooling water outlet 72 . The structure of the feed channel nozzle is shown in FIG. 3 . A feed channel nozzle 74 with a fan-shaped longitudinal section is provided at the lower end of the feed channel, and a plurality of injection holes 75 are provided on the surface thereof. The inner diameter of the injection hole 75 is 0.5-3 millimeters, and the included angle between the injection direction of the injection hole 75 and the vertical direction is 0-85°, which varies with different positions.

The furnace body 2 of the dropper furnace provides heat through auxiliary electric heating and other means to maintain the combustion of fuel in the furnace. During operation, solid fuel such as coal powder and combustion-supporting air enter into the hearth 1 of the dropper furnace through the inlet 3 of the dropper furnace. After the combustion is complete, the generated ash and flue gas are discharged through the outlet 4 of the dropper furnace. Through the up and down movement of the fuel feed channel 5 and the combustion aid feed channel 6 and the change of the material flow in the channel, the combustion in the dropper furnace and the position and concentration of the product can be adjusted, which facilitates the understanding of the combustion characteristics.

Claims (6)

1. a controllable adjustable drop tube furnace device, is characterized in that, drop tube furnace body of heater (2) is cylindrical shell, and its end face arranges drop tube furnace import (3), and bottom surface arranges drop tube furnace outlet (4); The plural feeding-passage that can move up and down is through the end face of drop tube furnace body of heater (2), stretch in drop tube furnace burner hearth (1), use as fuel feed channel (5) and combustion adjuvant feeding-passage (6) respectively;

Feeding-passage is three layers of pipeline configuration, and innermost layer is feeding-passage, is connected with the external world by feeding-passage entrance (71); Two outside layers is cooling-water duct, and the cooling-water duct in intermediate layer is connected with the external world by cooling water inlet (73), and outermost cooling-water duct is connected with the external world by coolant outlet (72); It is fan-shaped feeding-passage shower nozzle (74) that the bottom of feeding-passage arranges longitudinal section, and feeding-passage shower nozzle (74) surface arranges multiple spray-holes (75).

2. a kind of controllable adjustable drop tube furnace device according to claim 1, is characterized in that, the internal diameter of described spray-hole (75) is 0.5～3 millimeter, and the angle between injection direction and the vertical direction of spray-hole (75) is 0～85 °.

3. a kind of controllable adjustable drop tube furnace device according to claim 1, is characterized in that, between described feeding-passage and drop tube furnace body of heater (2), is threaded engagement.

4. a using method for drop tube furnace device claimed in claim 1, is characterized in that, feeding-passage is divided into fuel feed channel (5) and combustion adjuvant feeding-passage (6), and fuel is solid fuel, liquid fuel or gaseous fuel; The fuel quantity that fuel feed channel (5) passes into is 10～30% of drop tube furnace burner hearth (1) total heat duties, and the combustion-supporting dosage that combustion adjuvant feeding-passage (6) passes into is 10～30% of the total combustion-supporting dosage of drop tube furnace burner hearth (1); Easy on and off by feeding-passage in drop tube furnace burner hearth (1) moves and regulates the variation of amount of substance in passage, growing amount and the change in concentration of combustion product, pollutant in control and regulation stove.

5. the using method of drop tube furnace device according to claim 4, is characterized in that, described solid fuel comprises coal dust and living beings, and liquid, gaseous fuel comprise liquid or the gaseous fuel after oil, natural gas or the liquefaction of the carbon containing energy, gasification.

6. the using method of drop tube furnace device according to claim 4, is characterized in that, described feeding-passage adopts heater heating outward at drop tube furnace device, improves the temperature that passage fuel or combustion adjuvant enter drop tube furnace burner hearth.