A treatment system for reducing emission of CO in dry quenching exhaust gas

Abstract

The utility model belongs to the technical field of coal chemical industry, concretely relates to a kind of treatment system of dry quenching emission gas CO emission reduction, the treatment system includes heat storage room, combustion chamber;Dry quenching emission gas main pipe is connected heat storage room A and heat storage room B respectively by gas outlet pipeline, and heat storage body is set in heat storage room A and heat storage room B, valve is set on gas outlet pipeline;Heat storage room A and heat storage room B connect combustion chamber;Combustion chamber connects combustion air device;Gas outlet pipeline is connected exhaust pipeline, and valve is set on exhaust pipeline;The system effectively reduces the content of carbon monoxide of emission gas, reduces pollution, while effectively utilize the heat of dry quenching emission gas, reduce energy consumption, after combustion, flue gas temperature is higher, flue gas high-temperature waste heat is recycled, reduce the cost of dry quenching emission gas treatment, it is favorable to the application of industrialization.

Description

Technical Field

[0001] This utility model belongs to the field of coal chemical technology, specifically relating to a treatment system for CO emission reduction in dry quenching vent gas. Background Technology

[0002] Dry quenching is a quenching method that uses circulating gas to cool red-hot coke. While the circulating gas cools the coke in the dry quenching furnace, the CO2 and H2O in the gas react with the red-hot coke to produce CO and H2. Additionally, volatile matter in the red-hot coke also produces some CO. For safe operation, the concentration of combustible gases needs to be controlled within a safe range. Air is introduced to burn some of the CO and H2, which increases the amount of circulating gas. This excess gas needs to be discharged from the circulating system; this external exhaust gas is called dry quenching vent gas.

[0003] The vent gas from dry quenching coke contains combustible components, mainly CO, typically at a content of 3-6%; the vent volume is approximately 5000-20000 Nm³. 3 The current methods for treating vented gases are mostly to directly release them into the atmosphere or to treat them after desulfurization and dust removal before release. Therefore, the CO in the vented gases is emitted without treatment, causing CO pollution and wasting heat.

[0004] The carbon monoxide content in the gases released from dry quenching cannot be directly reduced by combustion, mainly because of its low calorific value, approximately 150~300 kcal / Nm³. 3 It has an extremely low calorific value, which is unstable and fluctuates greatly with production. Conventional combustion methods cannot burn it, and it requires a high-performance combustion system.

[0005] Currently, methods for treating CO in dry quenching vent gas include a low-temperature staged decarbonization reactor and flue gas treatment system disclosed in patent application number 2023225666069, which uses a catalyst to catalyze CO and reduce the amount of carbon monoxide emitted into the atmosphere. However, this method uses relatively complex equipment and expensive catalysts, resulting in high costs and hindering its industrial promotion and application. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model proposes a CO emission reduction treatment system for dry quenching coke vent gas. This system effectively reduces the carbon monoxide content in the vent gas, thereby reducing pollution. At the same time, it effectively utilizes the heat of the dry quenching coke vent gas, reducing energy consumption. After combustion, the flue gas temperature is relatively high, and the high-temperature waste heat of the flue gas is then recovered and utilized, reducing the cost of treating dry quenching coke vent gas and facilitating industrial applications.

[0007] In this invention, the vent gas from the dry quenching coke vent gas main pipe enters the CO emission reduction treatment system. The combustion chamber is first heated by a heating device, and a suitable amount of air is provided by the combustion air device, so that CO and H2 in the vent gas burn in the combustion chamber, effectively reducing the CO content in the vent gas. At the same time, the combustion provides heat to the heat exchanger in the combustion chamber, heating the water in the heat exchanger to generate hot water or steam, which is then sent out. The high-temperature flue gas from the combustion chamber is used for energy storage in the heat storage chamber, and after flowing through the heat storage chamber, it enters the subsequent flue gas treatment system through the discharge pipe. After energy storage, the heat storage chamber in the heat storage chamber can provide heat to the vent gas to reach the combustion temperature. The vent gas flows into the combustion chamber for combustion after passing through the heat storage chamber in the heat storage chamber, and the combustion chamber no longer needs to be heated by the heating device. This invention fully utilizes the heat inherent in the vented gas, further heating it on top of its thermal energy, which reduces energy consumption. The heat from the flue gas during and after combustion is first used to heat water via heat exchange, and then the heat is supplied to the heat storage body. This allows the heat storage body to store energy for use in the next heating of the vented gas. This fully, rationally, and effectively utilizes the heat carried by the vented gas, reduces processing costs, and produces byproducts. The processing system is simple, easy to install, maintain, and monitor, and is conducive to large-scale promotion and application.

[0008] The technical solution of this utility model is as follows:

[0009] A CO emission reduction treatment system for dry quenching coke vent gas includes a heat storage chamber and a combustion chamber. The dry quenching coke vent gas main is connected to heat storage chamber A and heat storage chamber B respectively through an outlet pipe. Heat storage bodies are installed in both heat storage chamber A and heat storage chamber B, and valves are installed on the pipes. Heat storage chamber A and heat storage chamber B are connected to the combustion chamber. The combustion chamber is connected to a combustion air device. An exhaust pipe is connected to the outlet pipe, and a valve is installed on the exhaust pipe.

[0010] This invention utilizes two sets of heat storage chambers and heat storage bodies. In actual use, the vent gas first flows through the heat storage body in heat storage chamber A before entering the combustion chamber. The high-temperature flue gas released after combustion with air flows into the heat storage body in heat storage chamber B. Once the heat storage body has stored enough heat, the vent gas is heated again in heat storage chamber B before entering the combustion chamber to burn with air. The high-temperature flue gas after combustion then flows back through the heat storage body in heat storage chamber A. Once heat storage body A has stored enough heat, the vent gas from the dry quenching process is heated again in heat storage body A. Through the cyclical utilization of the heat storage bodies in heat storage chambers A and B, heat is not supplied by an unnecessary heating device. The combustion standard can be achieved through its own circulation, effectively reducing carbon monoxide content, saving resources, and reducing energy consumption. At the same time, the high-temperature flue gas is heated by a heat exchanger to form steam, which is then sent out, generating revenue and reducing costs. The additional heating on top of the heat already present in the vent gas further reduces energy consumption.

[0011] Preferably, a heat exchanger is installed in the combustion chamber, that is, multiple sets of heat exchange tubes are installed in the combustion chamber, and cool water is circulated in the heat exchange tubes. The cool water provides heat through the combustion of the vent gas in the combustion chamber and the high-temperature hot gas generated.

[0012] Preferably, an induced draft fan is installed on the exhaust pipe.

[0013] Preferably, the combustion chamber is connected to a heating device to provide heat to the first batch of released gas, enabling it to meet the conditions for combustion. After the first batch of released gas has been burned and obtained high-temperature flue gas, heat is then supplied to the heat storage body in the heat storage chamber. This allows subsequent released gas to obtain heat directly from the heat storage body in the heat storage chamber, through which the high-temperature flue gas flows, without needing to use the heating device again, thus meeting the conditions for combustion. It also prevents the released gas from failing to meet the combustion conditions after passing through the heat storage body in the heat storage chamber, which has passed through high-temperature flue gas. Alternatively, an external heat source can be connected to provide energy to the combustion chamber, enabling the released gas and air to burn completely.

[0014] Preferably, the valve on the exhaust pipe connecting the exhaust port of the dry quenching device to the outlet of the heat storage chamber A is the first valve, and the valve on the exhaust pipe connecting the exhaust port of the dry quenching device to the outlet of the heat storage chamber B is the second valve; the flow direction of the released gas is effectively controlled by the first valve and the second valve.

[0015] Preferably, the valve on the exhaust pipe connected to the exhaust port of the dry quenching device to the exhaust pipe of the heat storage chamber A is the third valve, and the valve on the exhaust pipe connected to the exhaust port of the dry quenching device to the exhaust pipe of the heat storage chamber B is the fourth valve.

[0016] Preferably, the bottom of the combustion chamber is connected to a slag outlet, and a valve is installed on the slag outlet. Any residue in the vent gas or after combustion can be discharged through the slag outlet to prevent it from affecting the efficiency of the combustion chamber.

[0017] Preferably, a temperature sensor and a pressure sensor are installed on the combustion chamber. The temperature and pressure in the combustion chamber can be directly obtained through the temperature sensor and the pressure sensor, which is beneficial for real-time monitoring of the environment in the combustion chamber.

[0018] Preferably, the emission pipe is connected to a flue gas treatment system, which includes processes for treating flue gas such as desulfurization and dust removal. After treatment, the flue gas passes the test and is then discharged into the atmosphere through the emission pipe, reducing air pollution.

[0019] Preferably, a valve is installed on the pipe connecting the combustion air device to the air inlet of the combustion chamber, and the flow rate can be effectively controlled by the valve.

[0020] More preferably, the combustion air device can be selected from other devices that blow air in, such as a blower.

[0021] This utility model provides a CO emission reduction treatment system for dry quenched coke vent gas. Utilizing a heat storage chamber, combustion chamber, heat exchanger, and combustion air device, it effectively reduces the carbon monoxide content of dry quenched coke vent gas, which has low and unstable calorific value, through combustion. It effectively utilizes the heat inherent in the vent gas itself, avoiding the problems of relying solely on its own calorific value or the difficulty in combustion due to unstable calorific value. It also effectively utilizes the temperature of the flue gas during and after combustion to provide heat to the heat storage chamber, thus generating additional heat for the vent gas and fully recovering heat, reducing production costs. It employs two sets of heat storage chambers and heat storage bodies; one is in use while the other is storing energy, and vice versa, with both sets operating in a cycle. By recovering heat, it supplies heat to the vent gas, achieving stable combustion. The overall structure of this treatment system is simple and easy to operate, effectively reducing the process cost of reducing carbon monoxide content in dry quenched coke vent gas, and is suitable for industrial application and promotion. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] In the diagram, 1 is the main venting gas pipe for dry quenching, 2 is the outlet pipe, 3 is the exhaust pipe, 4-1 is heat storage chamber A, 4-2 is heat storage chamber B, 5 is the heat storage body, 6 is the combustion chamber, 7 is the heat exchanger, 8 is the combustion air device, 9 is the heating device, 10 is the first valve, 11 is the second valve, 12 is the third valve, 13 is the fourth valve, and 14 is the induced draft fan. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection claimed in this application.

[0025] As shown in the figure, this utility model provides a CO emission reduction treatment system for dry quenching coke vent gas, including a heat storage chamber (serving as storage or energy storage) and a combustion chamber 6; the dry quenching coke vent gas main pipe 1 is connected to heat storage chambers A4-1 and B4-2 respectively through an outlet pipe 2, and heat storage bodies 5 are installed in both heat storage chambers A4-1 and B4-2, and valves are installed on the pipes; heat storage chambers A4-1 and B4-2 are connected to the combustion chamber 6; the air inlet of the combustion chamber 6 is connected to a combustion air device 8 through a pipe, and a valve is installed on the pipe, which can effectively control the flow rate; an exhaust pipe 3 is connected to the outlet pipe 2, and a valve is installed on the exhaust pipe 3; a heat exchanger 7 is installed in the combustion chamber 6, that is, multiple sets of heat exchange tubes are installed in the combustion chamber 6, and cool water is circulated in the heat exchange tubes. The combustion of the vent gas in the combustion chamber 6 and the high-temperature hot gas generated can provide heat to the cool water; the combustion chamber 6 is connected to a heating device 9.

[0026] The heating device 9 is used to provide heat to the first batch of released gas to meet the conditions for combustion. After the first batch of released gas has been burned and obtained high-temperature flue gas, it then provides heat to the heat storage body 5 in the heat storage chamber. This allows subsequent released gas to obtain heat directly from the heat storage body 5 in the heat storage chamber, which has passed through high-temperature flue gas, without needing to use the heating device again, so that it meets the conditions for combustion. At the same time, it can also prevent the released gas from failing to meet the conditions for combustion after passing through the heat storage body 5 in the heat storage chamber, which has passed through high-temperature flue gas. It can also provide energy to the combustion chamber 6 through an external heat source, so that the released gas and air can be fully combusted.

[0027] This invention utilizes two sets of heat storage chambers and heat storage bodies 5. The combustion chamber 6 is equipped with ports A and B, respectively, connecting heat storage chambers A4-1 and B4-2. When air enters through port A, it exits through port B, and vice versa. Within the heat storage body 5, the flow directions of the low-temperature gas and the high-temperature gas are opposite; that is, the inlet of the venting gas on the heat storage chamber is the outlet of the high-temperature flue gas, and vice versa. This achieves system reversal, enabling the recycling of the two sets of heat storage chambers and heat storage bodies 5, recovering heat, saving energy, and reducing costs.

[0028] In another embodiment, an induced draft fan 14 is installed on the exhaust pipe 3.

[0029] In another embodiment, the valve on the exhaust pipe 2 connecting the exhaust port of the dry quenching device to the heat storage chamber A4-1 is the first valve 10, and the valve on the exhaust pipe 2 connecting the exhaust port of the dry quenching device to the heat storage chamber B4-2 is the second valve 11; the flow direction of the released gas is effectively controlled by the first valve 10 and the second valve 11; the valve on the exhaust pipe 32 connected to the exhaust pipe 2 connecting the exhaust port of the dry quenching device to the heat storage chamber A4-1 is the third valve 12, and the valve on the exhaust pipe 32 connected to the exhaust pipe 2 connecting the exhaust port of the dry quenching device to the heat storage chamber B4-2 is the fourth valve 13.

[0030] In another embodiment, the bottom of the combustion chamber 6 is connected to a slag outlet, and a valve is installed on the slag outlet. Any residue in the vent gas or after combustion can be discharged through the slag outlet to prevent it from affecting the efficiency of the combustion chamber 6. Temperature sensors and pressure sensors are installed on the combustion chamber 6. The temperature and pressure in the combustion chamber 6 can be directly obtained through the temperature sensors and pressure sensors, which is beneficial for real-time monitoring of the environment in the combustion chamber 6.

[0031] In another implementation, the emission pipe is connected to a flue gas treatment system, which includes processes for treating flue gas such as desulfurization and dust removal. After treatment, the flue gas passes the test and is then discharged into the atmosphere through the emission pipe, reducing air pollution.

[0032] In another embodiment, the combustion air device 8 can be selected from other devices that blow air, such as a fan.

[0033] The concentration requirements for combustible components in dry quenching gas are not high; generally, a CO concentration greater than 2% is sufficient.

[0034] In actual implementation, the system of this utility model is first installed. The heating device 9 is used to heat the combustion chamber 6 to above 700°C. The combustion air device 8 is turned on, and air is introduced into the combustion chamber 6 through the fan. The first valve 10 and the fourth valve 13 are opened, and the second valve 11 and the third valve 12 are closed. The vent gas with a temperature of 130°C coming out of the dry quenching vent gas main pipe 1 flows into the combustion chamber 6 through the gas outlet pipe 2, the heat storage chamber A4-1, and the heat storage body 5. The vent gas begins to burn in the combustion chamber 6. At this point, water is introduced into heat exchanger 7. After heat exchange, the water is heated to produce hot water or steam. The high-temperature flue gas generated after combustion flows into heat storage chamber B4-2 and heat storage body 5, and then flows into flue gas treatment system through exhaust pipe 2, exhaust pipe 3, and induced draft fan 14. At this time, the first valve 10 and the fourth valve 13 are closed, and the second valve 11 and the third valve 12 are opened. The vent gas flows into combustion chamber 6 through exhaust pipe 2, heat storage chamber B4-2, and heat storage body 5. Combustion occurs in combustion chamber 6. After heat exchange in heat exchanger 7, the high-temperature flue gas generated by combustion flows into regenerator chamber A4-1 and regenerator 5, and then into the flue gas treatment system through outlet pipe 2, exhaust pipe 3, and induced draft fan 14. Then, the second valve 11 and the third valve 12 are closed, and the first valve 10 and the fourth valve 13 are opened. The flue gas then flows into combustion chamber 6 through outlet pipe 2, regenerator chamber A4-1, and regenerator 5. The vent gas burns in combustion chamber 6, first undergoes heat exchange in heat exchanger 7, and then flows into regenerator chamber B4-2 and regenerator 5, and then into the flue gas treatment system through outlet pipe 2, exhaust pipe 3, and induced draft fan 14. This cycle utilizes two sets of regenerator chambers and regenerator 5, making full use of the high temperature of the flue gas. No additional heat is needed. The high-temperature flue gas generated by its own combustion effectively provides heat for the vent gas to be treated. At the same time, it can also heat water through heat exchange to obtain by-products, effectively saving the cost of treating vent gas and achieving the goal of emission reduction.

[0035] This utility model provides a CO emission reduction treatment system for dry quenched coke vent gas. Utilizing a heat storage chamber 5, a combustion chamber 6, a heat exchanger 7, and a combustion-supporting air device 8, it effectively reduces the carbon monoxide content of dry quenched coke vent gas, which has low and unstable calorific value, through combustion. It effectively utilizes the heat inherent in the vent gas itself, avoiding the problems of relying solely on its own calorific value or the difficulty in combustion due to unstable calorific value. It also effectively utilizes the temperature of the flue gas during and after combustion to provide heat to the heat storage chamber 5, thus providing additional heat to the vent gas and fully recovering heat, reducing production costs. It employs two sets of heat storage chambers and heat storage bodies 5; one is in use while the other is storing energy, and vice versa, with both sets operating in a cycle. By recovering heat to supply heat to the vent gas, stable combustion of the vent gas is achieved. The overall structure of this treatment system is simple and easy to operate, effectively reducing the process cost of reducing carbon monoxide content in dry quenched coke vent gas, and is suitable for industrial application and promotion.

Claims

1. A treatment system for CO emission reduction from dry quenching off-gas, characterized in that: It includes a heat storage chamber and a combustion chamber (6); the dry quenching gas venting main pipe (1) is connected to heat storage chamber A (4-1) and heat storage chamber B (4-2) respectively through the gas outlet pipe (2). Heat storage body (5) is provided in both heat storage chamber A (4-1) and heat storage chamber B (4-2). A valve is provided on the gas outlet pipe (2); heat storage chamber A (4-1) and heat storage chamber B (4-2) are connected to the combustion chamber (6); the combustion chamber (6) is connected to the combustion air device (8); the gas outlet pipe (2) is connected to the exhaust pipe (3), and a valve is provided on the exhaust pipe (3).

2. A treatment system for CO emission reduction from dry quenching off-gas according to claim 1, characterized in that: A heat exchanger (7) is installed inside the combustion chamber (6).

3. A dry quenching off-gas CO emission reduction treatment system according to claim 1, characterized in that: An induced draft fan (14) is installed on the exhaust pipe (3).

4. The treatment system for CO emission reduction of dry quenching vent gas according to claim 1, characterized in that: The combustion chamber (6) is connected to the heating device (9).

5. A dry quenching off-gas CO emission reduction treatment system according to claim 1, characterized in that: The valve on the exhaust pipe (2) of the dry quenching device connecting the exhaust port to the heat storage chamber A (4-1) is the first valve (10), and the valve on the exhaust pipe (2) of the dry quenching device connecting the exhaust port to the heat storage chamber B (4-2) is the second valve (11).

6. A dry quenching off-gas CO emission reduction treatment system according to claim 1 or 5, characterized in that: The valve on the exhaust pipe (3) connected to the exhaust pipe (2) of the dry quenching device connecting to the heat storage chamber A (4-1) is the third valve (12), and the valve on the exhaust pipe (3) connected to the exhaust pipe (2) of the dry quenching device connecting to the heat storage chamber B (4-2) is the fourth valve (13).

7. A handling system for the abatement of CO emissions from dry quenching according to claim 1, characterized in that: The bottom of the combustion chamber (6) is connected to the slag outlet, and a valve is installed on the slag outlet.

8. A dry quenching off-gas CO emission reduction treatment system according to claim 1, characterized in that: Temperature and pressure sensors are installed on the combustion chamber (6).

9. The treatment system for CO emission reduction of dry quenching vent gas according to claim 1, characterized in that: A valve is installed on the pipe connecting the combustion air device (8) to the air inlet of the combustion chamber (6).

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