Comprehensive utilization device for removing carbon monoxide and recovering waste heat

Abstract

The utility model belongs to the related technical field of gas purification treatment, and particularly relates to a comprehensive utilization device for removing carbon monoxide and recovering waste heat, which is characterized by comprising a box body with a full-length structure, a gas inlet is arranged at one end of the box body, and a gas outlet is arranged at the other end of the box body. A flue gas heater, a catalyst bed and a flue gas heat exchange cooler are sequentially arranged from the gas inlet to the gas outlet, and a fan is arranged at the gas inlet and / or the gas outlet; the flue gas heat exchange cooler is a finned heat exchanger or a tubular heat exchanger, one path of a cooling medium is communicated with the flue gas heater through a pipeline, and the other path of the cooling medium is communicated with a heat user pipe network. The device has the advantages that the integrated tunnel structure is adopted, multi-stage catalysis can be realized, heat released in the catalytic oxidation process can be used by subsequent processes or efficiently recycled, the removal efficiency is high, the energy consumption is low, the device is stable and reliable in operation and convenient to maintain, fuel is saved or even saved, the energy consumption of industrial production is reduced, and the industrial production cost is reduced. The method has good environmental protection benefits and economic benefits.

Description

Technical Field

[0001] The utility model belongs to the technical field related to gas purification and treatment, and in particular relates to a device for removing carbon monoxide and recovering and comprehensively utilizing waste heat. Background Art

[0002] In the field of industrial flue gas treatment, especially for flue gas emitted by coal-fired and petrochemical industries, there are significant environmental challenges. These flue gases contain a large amount of harmful gases such as carbon monoxide (CO), which poses a serious threat to the environment and human health. At present, the removal of carbon monoxide mainly relies on catalytic oxidation, which needs to be carried out at a higher temperature, resulting in high energy consumption, and the service life and efficiency of the catalyst are limited. At the same time, a large amount of waste heat carried in industrial flue gas is often directly discharged with the flue gas, and is not effectively recycled, resulting in low energy efficiency.

[0003] The Chinese utility model patent with application number 201922461217.3 discloses a system for utilizing waste heat from flue gas of an electric furnace, including a heating device for treating carbon monoxide in flue gas, a first heat recovery device for performing a first waste heat recovery, a flue gas purification device for purifying the flue gas after being cooled by the first heat recovery device, and a second heat recovery device for performing a second waste heat recovery on the flue gas purified by the flue gas purification device. The heating device, the first heat recovery device, the flue gas purification device and the second heat recovery device are connected in sequence through pipelines. The utility model can perform waste heat recovery twice by changing the treatment steps of flue gas in the prior art, reasonably recovering the energy wasted in the existing flue gas treatment process, and making full use of chemical heat. This waste heat recovery technology is separated from the pollutant treatment equipment, which further reduces the efficiency of thermal energy utilization and increases equipment investment and operating costs.

[0004] Therefore, there is an urgent need for a comprehensive treatment technology that can both efficiently remove carbon monoxide and effectively recover waste heat in order to improve energy utilization efficiency, reduce energy costs, and reduce environmental pollution. Utility Model Content

[0005] The purpose of the utility model is to provide a device for removing carbon monoxide and recovering and comprehensively utilizing waste heat, which overcomes the shortcomings of the prior art, adopts an integrated structure, and utilizes the efficient reaction of oxygen and carbon monoxide in the flue gas to convert it into carbon dioxide under the action of multi-stage catalysis. Part of the heat released in this process is returned to the flue gas heater to preheat the flue gas, and the other part is directly used by factory users, thereby improving energy utilization efficiency, reducing energy costs, and reducing environmental pollution.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] A device for removing carbon monoxide and recovering and comprehensively utilizing waste heat, characterized in that it comprises a box body with a through-length structure, one end of the box body is provided with an air inlet, and the other end is provided with an air outlet, and a flue gas heater, a catalyst bed and a flue gas heat exchange cooler are sequentially provided from the air inlet to the air outlet, and a fan is provided at the air inlet and / or the air outlet; the flue gas heat exchange cooler is a fin-type heat exchanger or a tube-type heat exchanger, and the cooling medium is connected to the flue gas heater through a pipeline in one way and connected to the heat user pipeline network in the other way.

[0008] The speed of the fan is controlled by a control system. The control system collects temperature T, wind pressure P, flow F and gas component detection AR at the air inlet, flue gas heater, catalyst bed and flue gas heat exchange cooler, and is used to monitor the operating status of the device in real time. The catalyst reaction conditions are met by adjusting the induced draft fan speed and heating temperature. Valves are respectively provided on the inlet and outlet pipes of the flue gas heater and the flue gas heat exchange cooler to adjust the medium flow. A pressure release valve and an emergency stop button are provided in the control system.

[0009] At least one spare heater is arranged behind the flue gas heater; at least one spare catalyst bed is arranged behind the catalyst bed; at least one reserved catalyst bed is arranged behind the spare catalyst bed, and each of the catalyst beds is a quick-change plug-in structure.

[0010] The cooling medium is water, and a pressure pump is arranged on the pipeline between the flue gas heater and the flue gas heat exchange cooler. The pressure pump is any one of a gear pump, a vane pump or a screw pump.

[0011] The flue gas heater comprises at least one set of fin-type flue gas heat exchangers for heating the flue gas.

[0012] The flue gas heater and / or standby heater is provided with an electric heating wire or an electric heating tube, and the circuit switch of the electric heating wire or the electric heating tube is controlled by a control system. When the temperature detects that the flue gas temperature is lower than the reaction temperature of the catalyst bed, the electric heater starts; when the flue gas temperature reaches the reaction temperature of the catalyst bed, the electric heater stops working.

[0013] Different catalyst beds are loaded with catalysts with different activity parameters, and maintenance ports are provided between adjacent catalyst beds, so that staff can enter to perform maintenance and replace the catalyst beds.

[0014] After the treatment, each catalyst bed is provided with sensors for temperature T, wind pressure P and gas component detection AR.

[0015] The air inlet is provided with an air volume regulating valve. The heat user pipe network is provided with a flow detection device.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1) The integrated tunnel structure can realize multi-stage catalysis, and the efficient reaction of oxygen and carbon monoxide in the flue gas is converted into carbon dioxide. The heat released during the catalytic oxidation of carbon monoxide into carbon dioxide can be used for subsequent processes or efficiently recovered. It has high removal efficiency, low energy consumption, stable and reliable equipment operation, and convenient maintenance. It saves or even eliminates the use of fuel, reduces the energy consumption of industrial production, and has good environmental and economic benefits.

[0018] 2) The device is safe and reliable. It is equipped with safety devices such as pressure relief valve and emergency stop button. When the pressure detection device in the device detects that the pressure in each section inside the device exceeds the safety pressure, the pressure relief valve will be activated urgently.

[0019] 3) After the water vapor is supplied to the factory users for heat exchange, it is cooled down and turned into cooling water. The water is sent back to the flue gas cooling section through a pressure pump for recycling, saving resources and solving the problem of inconvenient real-time transportation of water vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0021] Figure 2 It is a workflow control diagram of an embodiment of the utility model.

[0022] In the figure: 1-box, 2-air inlet, 3-flue gas heater, 4-standby heater, 5-first catalyst bed, 6-second catalyst bed, 7-standby catalyst bed, 8-inspection port, 9-flue gas heat exchange cooler, 10-air outlet, 11-heat user pipeline network, V0-flue gas flow regulating valve, V1, V2, V3, V4-medium flow regulating valve, P-pressure detection device, T-temperature detection device, AR-gas component detection device, F-flow detection device. DETAILED DESCRIPTION

[0023] The technical solution of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the utility model. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0025] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the utility model claimed, but only represents the selected embodiments of the utility model.

[0026] See Figure 1-2 , is a schematic diagram of the structure of an embodiment of a carbon monoxide removal and waste heat recovery and comprehensive utilization device of the utility model, including a box body with a full-length structure, which can be arranged horizontally or vertically, an air inlet 2 is arranged at one end of the box body 1, and an air outlet 10 is arranged at the other end. From the air inlet 2 to the air outlet 10, various functional units such as a flue gas heater 3, a first catalyst bed 5, a second catalyst bed 6, a catalyst spare bed 7 and a flue gas heat exchange cooler 9 are arranged in sequence, and an induced draft fan is arranged at the air outlet 10; the flue gas heat exchange cooler 9 is a fin heat exchanger or a tube heat exchanger, and the cooling medium is connected to the flue gas heater 3 through a pipeline in one way and connected to the heat user pipeline 11 in the other way. Each catalyst bed is a quick-change plug-in structure.

[0027] An air volume regulating valve V0 is provided at the air inlet 2. The speed of the induced draft fan is controlled by the control system, which collects parameters such as temperature T, wind pressure P, flow F and gas component detection AR at the air inlet 2, flue gas heater 3, first catalyst bed 5, second catalyst bed 6, catalyst spare bed 7 and flue gas heat exchange cooler 9, which are used to monitor the operating status of the device in real time, and meet the catalyst reaction conditions by adjusting the induced draft fan speed and heating temperature. The inlet and outlet pipes 10 of the flue gas heater 3 and the flue gas heat exchange cooler 9 are respectively provided with medium flow regulating valves (V1, V2, V3, V4) for adjusting the medium flow. After each catalyst bed is treated, sensors for temperature T, wind pressure P and gas component detection AR are provided to monitor the changes in temperature, flow and CO composition in real time.

[0028] A standby heater 4 is provided behind the flue gas heater 3. The cooling medium is water. A booster pump P1 is provided on the pipeline between the flue gas heater 3 and the flue gas heat exchange cooler 9. The booster pump is any one of a positive displacement pump such as a gear pump, a vane pump or a screw pump to maintain a stable flow rate. The flue gas heater 3 includes a set of finned flue gas heat exchangers for heating the flue gas. The flue gas heater 3 and the standby heater are provided with electric heating wires or electric heating tubes. The circuit switches of the electric heating wires or electric heating tubes are controlled by a control system. When the temperature detects that the flue gas temperature is lower than the reaction temperature of the catalyst bed, the electric heater starts. When the flue gas temperature reaches the reaction temperature of the catalyst bed, the electric heater stops working.

[0029] Different catalyst beds are loaded with catalysts with different activity parameters. An inspection port 8 is provided between adjacent catalyst beds, so that the staff can enter for inspection and replace the catalyst beds. A flow detection F is provided on the heat user pipe network 11, and the ratio of its flow to the output flow of the flue gas heat exchange cooler 9 is 1:2-3, and generally 1:2.2-2.5 is appropriate.

[0030] Example 1

[0031] Taking a certain industrial facility as an example, its combustion process produces about 10,000 cubic meters of waste gas containing carbon monoxide every day. The concentration of carbon monoxide in the waste gas is about 5,000 ppm, that is, 5,000 parts per million of gas are carbon monoxide, accompanied by about 250 kW of heat energy loss.

[0032] The box is a horizontal tower, and the control process is as follows:

[0033] 1. Device startup and preheating stage: First, the operator starts the program and starts the device through the control system. The control system first checks whether all sensors and safety systems are normal. Then the system enters the preheating stage, the flue gas heater starts preheating, and the temperature monitoring device (T) starts to monitor the heater temperature. When the temperature of the heater outlet reaches the initial temperature required for the catalyst bed reaction (such as 200°C), the control system starts to run the next stage;

[0034] 2. Flue gas treatment stage: First, the induced draft fan is started to introduce the industrial flue gas into the box 1 from the air inlet 2, and then the flue gas is heated to a suitable reaction temperature when passing through the flue gas heater 3. The heated flue gas enters the first catalyst bed 5, where carbon monoxide reacts with oxygen to generate carbon dioxide; the catalyst model is palladium carbon (brand: Kramar).

[0035] 3. Waste heat recovery stage: The flue gas after the reaction enters the flue gas heat exchange cooler 9, where it is cooled by medium exchange, and heat energy is recovered and distributed. A part of it is used in the flue gas heater 3 to maintain the temperature required for the catalytic reaction, and the other part can be used for other heat energy needs of the factory. The ratio of the flow rate of the heat user network 11 to the output flow rate of the flue gas heat exchange cooler 9 is 1:2.5. The 250kW original heat energy passes through the flue gas heat exchange cooler 9, converting about 80% of the lost heat energy into usable energy, that is, 200kW. This 200kW of energy is enough to power the lighting and some small mechanical equipment in the factory. When the heat demand of the heat user network 11 is met, the medium is also cooled, and then transported back to the flue gas cooling section through the booster pump P1 to replenish the cooling medium.

[0036] In Example 1, the temperature of the flue gas before treatment was 140°C-170°C, the CO concentration was 5000 ppm, the temperature after treatment was 95-120°C, the carbon monoxide concentration was 580 ppm, and the removal efficiency of the device was 88.4%.

[0037] Example 2

[0038] The box is a vertical tower, and the control process is as follows:

[0039] 1. Device startup and preheating stage: First, the operator starts the program and starts the device through the control system. The control system first checks whether all sensors and safety systems are normal. Then the system enters the preheating stage, the flue gas heater starts preheating, and the temperature monitoring device (T) starts to monitor the heater temperature. When the temperature of the heater outlet reaches the initial temperature required for the catalyst bed reaction (such as 230°C), the control system starts to run the next stage;

[0040] 2. Flue gas treatment stage: First, the induced draft fan is started to introduce the industrial flue gas into the box 1 from the air inlet 2, and then the flue gas is heated to a suitable reaction temperature when passing through the flue gas heater 3. The heated flue gas enters the first catalyst bed 5 and the second catalyst bed 6, where carbon monoxide reacts with oxygen to generate carbon dioxide; when the temperature at the catalyst bed is lower than the required value, the standby heater 4 assists the flue gas heater 3, and the control system turns on the standby heater to ensure that the flue gas is heated to the required value and maintain continuous operation of the device; the catalyst model on the first catalyst bed 5 is palladium carbon (brand: Kramar), and the catalyst model on the second catalyst bed 6 is hopcalite catalyst.

[0041] 3. Waste heat recovery stage: The flue gas after the reaction enters the flue gas heat exchange cooler 9, where it is cooled by medium exchange, and heat energy is recovered and distributed. A part of it is used in the flue gas heater 3 to maintain the temperature required for the catalytic reaction, and the other part can be used for other heat energy needs of the factory. The ratio of the flow rate of the heat user network 11 to the output flow rate of the flue gas heat exchange cooler 9 is 1:2.2. 250kW of original heat energy passes through the flue gas heat exchange cooler 9, converting about 80% of the lost heat energy into usable energy, that is, 200kW. This 200kW of energy is enough to power the lighting and some small mechanical equipment in the factory. When the heat demand of the heat user network 11 is met, the medium is also cooled, and then transported back to the flue gas cooling section through the booster pump P1 to replenish the cooling medium.

[0042] In Example 2, the temperature of the flue gas before treatment was 126-160°C, the CO concentration was 5000 ppm, the temperature after treatment was 105-130°C, the carbon monoxide concentration was 500 ppm, and the removal efficiency of the device was 90%.

[0043] In the above embodiments, the system monitors and adjusts: the control system monitors the flue gas temperature T, flow F, pressure P and other parameters in real time to ensure efficient and stable operation of the device. According to the monitoring data, the system automatically adjusts the conditions of the induced draft fan, valve opening and catalyst reaction section to optimize the operating efficiency. Among them, the valve V0 is adjusted to control the catalytic combustion air velocity not higher than 10000 / h -1; Adjust valves V1, V2, V3, V4 to control the flow of heat exchange medium.

[0044] The embodiment of the utility model is equipped with safety devices such as a pressure relief valve and an emergency stop button. When the pressure sensor P in the device detects that the pressure in each section inside the device exceeds the safety pressure, the pressure relief valve is activated urgently. When the pressure continues to rise, the device automatically shuts down. The catalyst performance is checked regularly. When the catalyst bed is damaged or fails, the catalyst is quickly replaced through the catalyst spare bed 7 when necessary.

[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for removing carbon monoxide and recovering waste heat, characterized in that: It comprises a box body with a through-length structure, one end of the box body is provided with an air inlet, the other end of the box body is provided with an air outlet, a flue gas heater, a catalyst bed and a flue gas heat exchange cooler are provided in sequence from the air inlet to the air outlet, and a fan is provided at the air inlet and / or the air outlet; the flue gas heat exchange cooler is a fin-type heat exchanger or a tube-type heat exchanger, and the cooling medium is connected to the flue gas heater through a pipeline in one way and connected to the heat user pipeline network in the other way.

2. A device for removing carbon monoxide and recovering waste heat according to claim 1, characterized in that: The speed of the fan is controlled by a control system. The control system collects temperature T, wind pressure P, flow F and gas component detection AR at the air inlet, flue gas heater, catalyst bed and flue gas heat exchange cooler, and is used to monitor the operating status of the device in real time. The catalyst reaction conditions are met by adjusting the induced draft fan speed and heating temperature. Valves are respectively provided on the inlet and outlet pipes of the flue gas heater and the flue gas heat exchange cooler to adjust the medium flow. A pressure release valve and an emergency stop button are provided in the control system.

3. The device for removing carbon monoxide and recovering waste heat according to claim 1, characterized in that: At least one spare heater is arranged behind the flue gas heater; at least one spare catalyst bed is arranged behind the catalyst bed; at least one reserved catalyst bed is arranged behind the spare catalyst bed, and each of the catalyst beds is a quick-change plug-in structure.

4. The device for removing carbon monoxide and recovering waste heat according to claim 1, characterized in that: The cooling medium is water, and a pressure pump is arranged on the pipeline between the flue gas heater and the flue gas heat exchange cooler. The pressure pump is any one of a gear pump, a vane pump or a screw pump.

5. The device for removing carbon monoxide and recovering waste heat according to claim 1, characterized in that: The flue gas heater comprises at least one set of fin-type flue gas heat exchangers for heating the flue gas.

6. The device for removing carbon monoxide and recovering waste heat according to claim 1, characterized in that: The flue gas heater and / or standby heater is provided with an electric heating wire or an electric heating tube, and the circuit switch of the electric heating wire or the electric heating tube is controlled by a control system. When the temperature detects that the flue gas temperature is lower than the reaction temperature of the catalyst bed, the electric heating wire or the electric heating tube starts, and when the flue gas temperature reaches the reaction temperature of the catalyst bed, the electric heating wire or the electric heating tube stops working.

7. The device for removing carbon monoxide and recovering waste heat according to claim 1, characterized in that: Different catalyst beds are loaded with catalysts with different activity parameters, and maintenance ports are provided between adjacent catalyst beds, so that staff can enter to perform maintenance and replace the catalyst beds.

8. The device for removing carbon monoxide and recovering waste heat according to claim 1, characterized in that: After the treatment, each catalyst bed is provided with sensors for temperature T, wind pressure P and gas component detection AR.

9. The device for removing carbon monoxide and recovering waste heat according to claim 1, characterized in that: An air volume regulating valve is arranged at the air inlet.

10. The device for removing carbon monoxide and recovering waste heat according to claim 1, characterized in that: The heat user pipe network is provided with flow detection.

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