CN204619705U - A kind of ventilation air methane oxidized apparatus - Google Patents

Abstract

The utility model relates to an oxidation device for exhaust gas, which comprises an oxidation furnace body, which is sequentially provided with a uniform air intake box, a furnace oxidation zone, a heat accumulator, a cyclone and a heating device from the top to the bottom of the oxidation furnace body; the uniform air intake box There is a first air inlet on the top, and a second air inlet on the lower part of the oxidation furnace body. Both the first air inlet and the second air inlet are connected to the exhaust air gas inlet pipe through a valve; the vertical interval in the furnace oxidation zone is A plurality of gas flow pipes are arranged, and the upper end of the gas flow pipe communicates with the uniform air intake box; the heat accumulator is located at the lower end of the gas flow pipe; the upper side wall of the furnace oxidation zone is provided with a flue gas outlet, and the flue gas outlet is connected to the furnace The gaps between multiple gas flow pipes in the oxidation zone are connected; the heat exchanger is installed on the exhaust pipe connected with the flue gas outlet. The device of the utility model can continuously and rapidly realize gas oxidation, achieve more heat storage, long oxidation time under lack of air, high efficiency, stable adjustment, rapid heat exchange and increased power.

Description

A kind of exhaust air gas oxidation device

technical field

The utility model relates to an exhaust gas oxidation device, which belongs to the field of exhaust gas oxidation devices.

Background technique

"Fair wind" is also called "coal mine wind exhaust gas", which refers to coal mine gas with methane concentration lower than 0.75%. According to the statistics of relevant departments, the methane emitted into the atmosphere from exhaust air in China every year is equivalent to the gas transmission volume of the West-East Gas Pipeline for one year, and the greenhouse gas effect produced is about 200 million tons of carbon dioxide equivalent. Although the concentration of wind exhaust gas is extremely low, the total amount is extremely large. The methane contained in it accounts for about 81% of the total amount of methane in my country's coal mines, and the annual emission is more than 15 billion cubic meters.

At the present stage, most of the exhaust-air oxidation boilers are made of steel, and a large number of heat accumulators and high-power heating elements need to be added. achieve practical application.

Contents of the invention

The technical problem to be solved by the utility model is to provide a ventilation gas oxidation device, which overcomes the disadvantages of high cost of ventilation boilers in the prior art, difficulty in realizing continuous and rapid oxidation process, and limited practical application.

The technical solution of the utility model to solve the above technical problems is as follows: a ventilation gas oxidation device, including an oxidation furnace body and a heat exchanger, and the oxidation furnace body is provided with a uniform air intake box, a furnace oxidation zone, a storage Heater, cyclone and heating device;

The uniform air intake box is provided with a first air inlet, and the lower part of the oxidation furnace body is provided with a second air inlet. The gas pipeline is connected; the furnace oxidation zone is vertically arranged with a plurality of gas flow pipelines, and the upper end of the gas flow pipeline is connected with the uniform air intake box; the heat accumulator is located at the lower end of the gas flow pipeline; A flue gas outlet is provided on the side wall of the upper part of the furnace oxidation zone, and the flue gas outlet communicates with the gaps between the multiple gas flow pipes in the furnace oxidation zone; The smoke exhaust pipe connected to the above-mentioned smoke outlet.

The beneficial effects of the utility model are: since the utility model is provided with a second air inlet at the lower part of the oxidation furnace body, and a heating device is provided at the bottom, it can be heated by the heating device at the start-up stage, and the temperature rise of the ceramic cyclone can be passed through gradually. Inject the exhaust gas to achieve the effect of accelerating the start-up temperature and save energy consumption in the start-up stage; when the temperature in the oxidation zone of the furnace reaches the start-up temperature, close the second air inlet, and feed the exhaust gas through the first air inlet, and the exhaust gas After heat exchange between multiple gas flow pipes and multiple gas flow pipes, the gas reaches the heat accumulator, then enters the gap between the multiple gas flow pipes through the cyclone for final complete oxidation, and then reaches the heat exchanger Discharge after heat exchange, this process can achieve continuous and rapid gas oxidation, achieve more heat storage, stable adjustment, rapid heat exchange, and increase power.

On the basis of the above technical solutions, the utility model can also be improved as follows.

The utility model is a ventilation gas oxidation device as described above, further, the ventilation gas intake pipeline includes a ventilation gas intake main pipeline, a first ventilation gas intake branch pipeline and a second ventilation gas intake pipeline Branch pipeline;

The exhaust air gas intake main pipeline is sequentially provided with an intake electric door, a first branch pipeline installed with an air distribution electric door, a booster fan, and a second branch pipeline installed with an air intake safety release valve along the airflow direction; One end of the first exhaust air gas inlet branch pipe and the second exhaust air gas inlet branch pipe are connected to one end of the exhaust air gas inlet main pipe; the other end of the first exhaust air gas inlet branch pipe is connected to the The first air inlet is connected; the other end of the second exhaust air gas inlet branch pipe is connected with the second air inlet.

The utility model is a kind of exhaust air gas oxidation device as described above, further, the first exhaust air gas intake branch pipeline is provided with an air intake pressure regulating valve; the second exhaust air gas intake branch pipeline is provided with thermostatic valve.

The utility model is a kind of exhaust air gas oxidation device as described above, further, the first air inlet and the second air inlet are respectively two, which are respectively arranged on both sides of the uniform air inlet box and the lower part of the oxidation furnace body .

The utility model is an oxidation device for exhaust gas as described above, further, the heating device is an electric heating wire or an electric heating rod or a natural gas heater.

The utility model is a ventilation gas oxidation device as described above, further, the flue gas outlet and the heat exchanger are both two, and the flue gas outlet is symmetrically arranged on the side wall of the upper part of the furnace oxidation zone; The heat exchanger is installed on the smoke exhaust pipe communicating with the flue gas outlet.

The utility model is an oxidation device for exhaust gas as described above, further, a smoke exhaust pressure release valve is installed on the exhaust pipe.

The utility model is a ventilation gas oxidation device as described above, further, the two heat exchangers include water inlet pipes and hot water supply or steam pipes, and the water inlet pipes are provided with heat exchanger water inlet gates; The hot water supply or steam pipeline is provided with a steam regulating door.

The beneficial effect of adopting the above further solution is that: when the high-temperature flue gas passes through the heat exchanger, the cold water fed into the water inlet pipe can be heated, and the heat energy can be effectively used. And because the flue gas outlet and the heat exchanger are arranged symmetrically on the side wall of the upper part of the furnace oxidation zone, it can be judged whether the flue gas at the flue gas outlet is smoothly circulated according to the water outlet temperature or steam temperature of the heat exchanger.

The utility model is an oxidation device for exhaust gas as described above, further, the main wall is made of refractory bricks for the body of the oxidation furnace, and the inner wall is coated with high-temperature-resistant cement mortar. The utility model adopts the refractory brick of the oxidation furnace body to make the main wall, and the inner wall is coated with high-temperature resistant cement mortar, which can achieve the required strength, and has part of the function of the heat accumulator, so as to achieve the purpose of fast operation and reduce the cost.

Description of drawings

Fig. 1 is a structural schematic diagram of a ventilation-drain gas oxidation device of the present invention.

FIG. 2 is an enlarged schematic view of FIG. 1A .

In the accompanying drawings, the list of parts represented by each label is as follows:

1. Intake electric door, 2. Air distribution electric door, 3. Safety release valve, 4. Temperature regulating valve, 5. Smoke exhaust pressure release valve, 6. Intake pressure regulating valve, 7. Uniform air intake box, 8 . Furnace oxidation zone, 9. Regenerator, 10. Cyclone, 11. Heat exchanger, 12. Heat exchanger water inlet door, 13. Steam regulating door, 14. Heating device, 15. Booster fan, 16 . Oxidation furnace body, 17. The first pipeline, 18. The second pipeline, 19. The exhaust air gas intake pipe, 191. The exhaust air gas intake main pipeline, 192. The first exhaust air gas intake branch pipeline, 193 The second exhaust air gas inlet branch pipe, 20, the first air inlet, 21, the second air inlet, 22, the gas air flow pipe, 23, the flue gas outlet, 24, the smoke exhaust pipe, 25, multiple outlets The gap between the gas flow pipes.

Detailed ways

The principles and features of the present utility model are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the utility model, and are not used to limit the scope of the utility model.

As shown in Figure 1 and Figure 2, the utility model is an oxidation device for exhaust gas, which includes an oxidation furnace body 16 and a heat exchanger 11, and the oxidation furnace body 16 is provided with a uniform air intake box 7 and a furnace in sequence from the top to the bottom. Oxidation zone 8, heat accumulator 9, cyclone 10 and heating device 14; the oxidation furnace body 16 is made of refractory bricks as the main wall, and the inner wall is coated with high temperature resistant cement mortar. The heating device 14 is an electric heating wire or an electric heating rod. The heat accumulator 9 described in the specific implementation process of the utility model is a ceramic heat accumulator. The cyclone 10 is a wear-resistant ceramic cyclone.

The uniform air inlet box 7 is provided with a first air inlet 20, and the lower part of the oxidation furnace body is provided with a second air inlet 21, and both the first air inlet 20 and the second air inlet 21 pass through the valve It communicates with the exhaust air gas inlet pipe 19; a plurality of gas air flow pipes 22 are vertically arranged in the furnace oxidation zone 8, and the upper end of the gas air flow pipe 22 communicates with the uniform air intake box 7; the heat storage The device 9 is located at the lower end of the gas flow pipe 22; the side wall of the upper part of the furnace oxidation zone 8 is provided with a flue gas outlet 23, and the flue gas outlet 23 is connected to a plurality of gas flow channels in the furnace oxidation zone 8. The gap 25 between the pipes communicates; the heat exchanger 11 is installed on the exhaust pipe 24 communicating with the smoke outlet 23 ; the exhaust pressure release valve 5 is installed on the exhaust pipe 24 .

The exhaust air gas intake pipe 19 includes the exhaust air gas intake main pipeline 191, the first exhaust air gas intake branch pipeline 192 and the second exhaust air gas intake branch pipeline 193; 191 along the direction of the airflow are provided with an intake electric door 1, a first branch pipeline 17 for installing an air distribution electric door 2, a booster fan 15, and a second branch pipeline 18 for installing an intake safety release valve 3; One end of the exhaust air gas inlet branch pipe 192 and the second exhaust air gas inlet branch pipe 193 communicate with one end of the exhaust air gas inlet main pipe 191; One end communicates with the first air inlet 20 ; the other end of the second exhaust air gas inlet branch pipe 193 communicates with the second air inlet 21 . The first exhaust air gas inlet branch pipe 192 is provided with an air intake pressure regulating valve 6 ; the second exhaust air gas inlet branch pipe 193 is provided with a temperature regulating valve 4 .

Another embodiment of the utility model is an oxidation device for exhausted air gas. The first air inlet 20 and the second air inlet 21 are two respectively, which are respectively arranged in the uniform air inlet box 7 and the oxidation furnace. Both sides of the lower part of the body 16; the flue gas outlet and the heat exchanger 11 are two, and the flue gas outlet is symmetrically arranged on the side wall of the upper part of the furnace oxidation zone; The smoke exhaust pipe connected to the above-mentioned smoke outlet. The two heat exchangers all include water inlet pipes and hot water supply or steam pipes, and the water inlet pipes are provided with a heat exchanger inlet door 12; the hot water supply or steam pipes are provided with a steam regulating door 13 .

Working process of the present utility model:

1. In the start-up stage, the furnace is heated by the heating device at the bottom of the oxidation furnace body. According to the temperature rise of the ceramic cyclone 10, the exhaust gas is gradually passed through the temperature control valve 4 to achieve the effect of accelerating the start-up temperature and saving energy consumption in the start-up stage. ;

2. After the furnace reaches the start-up temperature, close the temperature regulating valve 4, slowly pass the exhaust air gas through the intake pressure regulating valve 6, and gradually increase the exhaust air volume after detecting that the furnace temperature rises slowly to the rated temperature, and finally reach a uniform air intake box The temperature of 7 four measuring points, the 8 measuring points of the furnace oxidation zone, and the four temperature measuring points of the wear-resistant ceramic cyclone are all within the rated range. At this time, the boiler load can be increased or decreased according to the needs.

The thermal decomposition process of the exhaust gas is as follows: the exhaust gas is preheated to 300°C through the radiant heat of the uniform intake box 7 at the upper part of the furnace, and then enters the multiple gas flow pipes 22 in the oxidation zone 8 of the furnace to be gradually heated, and then reaches the resistance The position of grinding ceramic regenerator 9 reaches 800°C, the outlet of the wear-resistant ceramic regenerator reaches 1000°C, and finally enters the position of the ceramic deflector in the cyclone 10 to continue to maintain a temperature of 1200°C for mixed flow and thermal decomposition, and the residence time is not More than 1 second, the backflow enters the wear-resistant ceramic regenerator 9, enters the gap 25 between multiple gas flow pipes in the furnace oxidation zone 8 for final and complete oxidation, and passes through the flue gas on the side wall of the furnace oxidation zone 8 upper part The outlet 23 reaches the heat exchanger 11 for heat exchange and then is discharged through the exhaust pipe 24 . The temperature of furnace oxidation zone, ceramic regenerator and ceramic cyclone is regulated by inlet pressure regulating valve 6 and temperature regulating valve 4 . This process increases preheating, increases the residence time of the exhaust gas in the boiler, and performs thermal oxidation with sufficient temperature and time.

3. The heat exchanger can adjust the quality of the external heat medium through the valve 12 and the valve 13.

4. The exhaust gas pressure release valve 5 prevents the furnace pressure from rising suddenly and protects the heat exchanger 11 from overloading.

5. Air intake safety release valve 3 prevents the pressure from rising suddenly after the booster fan, that is, prevents explosion.

6. When the boiler is out of operation, open the air distribution electric door 2, close the air intake electric door 1, open the air intake pressure regulating valve 6, and gradually open the temperature regulating valve 4 according to the temperature of the air intake pressure equalization box 7, and control the boiler Cooling treatment; at the same time gradually withdraw from the operation of the heat exchanger 11.

Intake Electric Door 1 Closing Conditions: The concentration exceeds 1.5%, or the boiler needs to be stopped.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (9)

1. An oxidation device for exhaust gas, characterized in that it includes an oxidation furnace body and a heat exchanger, and the top to bottom of the oxidation furnace body is sequentially provided with a uniform air intake box, a furnace oxidation zone, a heat accumulator, and a cyclone and heating devices; The uniform air intake box is provided with a first air inlet, and the lower part of the oxidation furnace body is provided with a second air inlet. The gas pipeline is connected; the furnace oxidation zone is vertically arranged with a plurality of gas flow pipelines, and the upper end of the gas flow pipeline is connected with the uniform air intake box; the heat accumulator is located at the lower end of the gas flow pipeline; A flue gas outlet is provided on the side wall of the upper part of the furnace oxidation zone, and the flue gas outlet communicates with the gaps between the multiple gas flow pipes in the furnace oxidation zone; The smoke exhaust pipe connected to the above-mentioned smoke outlet. 2. The exhaust air gas oxidation device according to claim 1, characterized in that, the exhaust air gas inlet pipeline comprises the exhaust air gas intake main pipeline, the first exhaust air gas intake branch pipeline and the second exhaust air gas inlet pipe. Wind gas intake branch pipe; The exhaust air gas intake main pipeline is sequentially provided with an intake electric door, a first branch pipeline installed with an air distribution electric door, a booster fan, and a second branch pipeline installed with an air intake safety release valve along the airflow direction; One end of the first exhaust air gas inlet branch pipe and the second exhaust air gas inlet branch pipe are connected to one end of the exhaust air gas inlet main pipe; the other end of the first exhaust air gas inlet branch pipe is connected to the The first air inlet is connected; the other end of the second exhaust air gas inlet branch pipe is connected with the second air inlet. 3. A kind of exhaust air gas oxidation device according to claim 2, characterized in that, said first exhaust air gas inlet branch pipeline is provided with an air intake pressure regulating valve; said second exhaust air gas inlet branch A temperature regulating valve is provided on the pipeline. 4. The exhaust air gas oxidation device according to claim 1 or 2, characterized in that there are two first air inlets and two second air inlets, and the first air inlets are respectively provided with corresponding In the uniform air inlet box, the second air inlets are correspondingly arranged on both sides of the lower part of the oxidation furnace body. 5. The exhaust air gas oxidation device according to claim 1 or 2, characterized in that the heating device is an electric heating wire or an electric heating rod. 6. The exhaust gas oxidation device according to claim 1 or 2, characterized in that there are two flue gas outlets and heat exchangers, and the flue gas outlets are symmetrically arranged on the upper part of the furnace oxidation zone on the side wall; the heat exchanger is installed on the smoke exhaust pipe communicating with the flue gas outlet. 7. The exhaust air gas oxidation device according to claim 6, characterized in that a smoke exhaust pressure relief valve is installed on the exhaust gas pipe. 8. A depleted air gas oxidation device according to claim 6, characterized in that, the two heat exchangers both include water inlet pipes and hot water supply or steam pipes, and the water inlet pipes are provided with heat exchangers A water inlet door; a steam regulating door is provided on the hot water supply or steam pipeline. 9. The exhaust air gas oxidation device according to claim 6, characterized in that the oxidation furnace body is made of refractory bricks as the main wall, and the inner wall is coated with high temperature resistant cement mortar.