Control device for maintaining temperature stability of catalytic combustion system

Abstract

The utility model discloses a control device for maintaining the temperature stability of a catalytic combustion system, and relates to the technical field of organic waste gas catalytic combustion treatment, the control device comprises an LEL detector, a catalytic combustion bed, a controller, a cold supplementing valve and a temperature sensor, the LEL detector is arranged on a gas inlet pipeline of the catalytic combustion bed, is connected with the cold supplementing valve, monitors the concentration of waste gas, and controls the temperature of the catalytic combustion bed to be stable. And the temperature sensor is arranged on the catalytic combustion bed, monitors the temperature of the catalytic combustion bed in real time and transmits a signal to the controller. According to the utility model, the exhaust gas concentration, the catalytic combustion temperature and the intelligent control strategy are adjusted in real time through the LEL detector, the catalytic combustion temperature can be accurately regulated and controlled, and a catalyst is ensured to work in an optimal temperature range, so that the purification efficiency is improved, the exhaust gas is effectively treated, and the system has a wide application prospect.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the organic waste gas catalytic combustion treatment technical field, specifically relates to a kind of control device for maintaining catalytic combustion system temperature stability. BACKGROUND

[0002] Catalytic combustion (CO) is an effective technology for treating industrial organic waste gas (VOCs). Due to the presence of catalysts, the activation energy required for oxidation reaction can be significantly reduced, and VOCs can undergo flameless combustion at a lower temperature. Harmful substances in the exhaust gas are completely converted into carbon dioxide and water, and a large amount of heat is released.

[0003] When using catalytic combustion technology to treat VOCs, a common practical problem is that most organic waste gas has the characteristics of large flow, low concentration and low temperature, which makes it impossible for the catalytic combustion device to achieve self-sustaining combustion, and additional energy is needed. First, use adsorption means to enrich and concentrate low-concentration VOCs, then increase the VOCs concentration by small air volume hot air desorption, and then send it into catalytic combustion, which can maintain normal operation without additional heat source. This adsorption-catalytic combustion combined process not only reduces the size of the overall catalytic combustion device, reduces the amount of catalyst used, but also reduces energy consumption and operating costs.

[0004] Generally speaking, the higher the initial temperature of the exhaust gas, the higher the concentration of organic matter in the exhaust gas, and the greater the possibility of self-sustaining combustion of the exhaust gas. However, in actual operation, the exhaust gas concentration fluctuates greatly, and the catalytic combustion system is difficult to maintain its own thermal balance. When the concentration of exhaust gas is low, the burner needs to be started to compensate for heating and maintain the reaction temperature. When the concentration is too high, the burner may automatically shut down due to overheating, causing the temperature of the catalytic bed to drop. After the temperature drops, the system needs to restart the burner, but due to the delay, the temperature rises slowly, the catalytic reaction temperature continues to drop, resulting in a decrease in purification efficiency, an increase in catalytic combustion tail gas concentration, and a risk of non-compliance with emission standards. Therefore, how to maintain the stability of the catalytic combustion temperature and maintain high purification efficiency has become a technical problem to be solved in the field. Utility model content

[0005] The technical problem to be solved by the utility model is to provide a control device for maintaining the stability of the catalytic combustion system temperature. The device adjusts the exhaust gas concentration through the LEL detector, intelligently controls the start and stop of the burner and the auxiliary heating device, ensures that the catalytic combustion temperature fluctuates within a reasonable range, and maintains high purification efficiency, avoiding the phenomenon that the tail gas cannot be stabilized during the catalytic combustion of organic waste gas.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] The utility model provides a kind of control device for maintaining catalytic combustion system temperature stability, including LEL detector, catalytic combustion bed, controller, cold supplement valve and temperature sensor, the LEL detector is arranged on catalytic combustion bed air inlet pipeline, and is connected with cold supplement valve, monitors exhaust concentration, controls cold supplement valve opening degree adjustment exhaust concentration, temperature sensor is arranged on catalytic combustion bed, and the temperature of catalytic combustion bed is monitored in real time, and signal is transmitted to controller.

[0008] Further, the temperature sensor includes preheating temperature element and reaction temperature element, the preheating temperature element is arranged on the catalytic combustion bed, and the preheating temperature of the exhaust gas in the catalytic combustion bed is monitored, and the reaction temperature element is arranged on the main body of the catalytic combustion bed, and the reaction temperature in the catalytic combustion bed is determined.

[0009] Further, the catalytic combustion bed is internally provided with an auxiliary heater.

[0010] Further, the catalytic combustion bed is provided with a burner, and the burner is connected with the combustion air fan.

[0011] Further, the CO fan is connected with the flame arrester, and the flame arrester is arranged on the catalytic air inlet pipeline.

[0012] Further, the CO fan is connected with the flame arrester, and the flame arrester is arranged on the catalytic air inlet pipeline.

[0013] Further, the catalytic air inlet pipeline is connected with the fresh air pipeline and the fresh air inlet, and the cold supplement valve is arranged on the fresh air pipeline.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] (1) the utility model adjusts exhaust concentration through LEL detector, and the start and stop of the burner and auxiliary heating device are intelligently controlled, so that the catalytic combustion temperature is ensured to fluctuate within a reasonable range, thereby maintaining high purification efficiency, and avoiding the phenomenon that tail gas cannot reach the standard stably during the catalytic combustion process of organic waste gas.

[0016] (2) the utility model can monitor the temperature of the catalytic combustion bed in real time through the temperature sensor, and signal is transmitted to the controller.

[0017] (3) the controller of the utility model can judge whether the temperature of the catalytic bed exceeds the preset range according to the received temperature signal, if the temperature exceeds the upper limit, the controller closes the burner, and starts the auxiliary heating device to slow down the temperature drop speed, if the temperature is lower than the lower limit, the controller starts the burner and closes the auxiliary heating device to improve the temperature.

[0018] (4) the utility model adjusts exhaust concentration in real time, and the start and stop of the burner and auxiliary heating device are cyclically controlled, so that the temperature of the catalytic combustion bed is maintained within the preset range, and the stability of purification efficiency is ensured. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the device structure for maintaining stable catalytic combustion temperature according to the present invention;

[0020] In the diagram, 1. Flame arrester; 2. CO fan; 3. Fresh air inlet; 4. Local thermometer A; 5. Catalytic combustion bed; 6. Combustion fan; 7. Burner; 8. Auxiliary heater; 9. Preheating temperature element; 10. Reaction temperature element; 11. Controller; 12. Cooling valve; 13. Frequency converter; 14. Local pressure gauge; 15. Pressure indicator controller; 16. Fan flexible connection; 17. LEL detector; 18. Local thermometer B;

[0021] Figure 2 This is a schematic diagram of the method for maintaining a stable catalytic combustion temperature according to the present invention. Detailed Implementation

[0022] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0023] like Figure 1 As shown, this utility model provides a control device for maintaining the temperature stability of a catalytic combustion system, including a flame arrester 1, a CO fan 2, a fresh air inlet 3, a local thermometer 4, a catalytic combustion bed 5, a combustion-supporting fan 6, a burner 7, an auxiliary heater 8, a preheating temperature element 9, a reaction temperature element 10, a controller 11, a cooling valve 12, a frequency converter 13, a local pressure gauge 14, a pressure indicating controller 15, a fan flexible connection 16, an LEL detector 17, and a local thermometer 18.

[0024] A CO fan 2 is installed on the inlet pipe of the catalytic combustion bed 5. An LEL detector 17 is installed between the CO fan 2 and the inlet pipe of the catalytic combustion bed 5. The CO fan 2 is connected to the flame arrester 1 through a pipe. The flame arrester 1 is connected to the catalytic air inlet through a pipe. The catalytic air inlet pipe is connected to a fresh air pipe and a fresh air inlet 3. A cooling valve 12 is installed on the fresh air pipe. A temperature sensor is installed on the catalytic combustion bed 5 to monitor the temperature of the catalytic combustion bed 5 in real time and transmit the signal to the controller 11. A burner 7 is installed on the catalytic combustion bed 5. The burner 7 is connected to the combustion fan 6. An auxiliary heater 8 is installed inside the catalytic combustion bed 5.

[0025] In this embodiment, the catalytic intake pipeline is provided with a flame arrester 1, and a local pressure gauge 14 and a pressure indicating controller 15 are arranged at the catalytic air inlet to observe whether the pressure is stable when the air is inhaled. The flame arrester 1 is connected with the CO fan 2 through a fan flexible connection 16, which is used for noise reduction of the CO fan 2 and thermal compensation of the pipeline deformation of the fan pipeline. The CO fan 2 is provided with a frequency converter 13, which controls the rotating speed of the fan by adjusting the power supply frequency of the motor, so as to adjust the air volume and air pressure, realize energy saving and process control, and interact with the local pressure gauge 14 and the pressure indicating controller 15. A fresh air pipeline and a fresh air inlet 3 are connected with the catalytic intake pipeline, and a cold supplement valve 12 is arranged on the fresh air pipeline. The CO fan 2 is connected with the air inlet pipeline of the catalytic combustion bed 5 through the fan flexible connection 16. A LEL detector 17 is arranged between the CO fan 2 and the air inlet pipeline of the catalytic combustion bed 5. A local thermometer A4 is arranged on the LEL detector 17 to observe the temperature in the pipeline. In this embodiment, the LEL detector 17 adopts a gas detector of Wan'andi FIX550-VOC type, which can detect the exhaust gas concentration in real time and transmit the signal to the cold supplement valve 12 to control the opening degree of the cold supplement valve 12 to adjust the concentration of the exhaust gas. The catalytic gas enters the CO fan 2 through the pipeline along the flame arrester 1, and then enters the inside of the catalytic combustion bed 5 through the pipeline.

[0026] In this embodiment, the inlet and outlet of the catalytic combustion bed 5 are provided with local thermometers B18 for observing the temperature difference between the inlet and outlet of the catalytic combustion system, and the catalytic combustion bed 5 is used for catalytic combustion of waste gas, and temperature sensors are arranged on the catalytic combustion bed 5 to monitor the temperature of the catalytic combustion bed 5 in real time and transmit signals to the controller 11, and the temperature sensors include preheating temperature elements 9 and reaction temperature elements 10, the preheating temperature elements 9 are arranged on the catalytic combustion bed 5 to monitor the preheating temperature of the waste gas in the catalytic combustion bed 5, and the reaction temperature elements 10 are arranged on the main body of the catalytic combustion bed 5 to measure the reaction temperature in the catalytic combustion bed 5, and the catalytic combustion bed 5 is provided with a burner 7 connected with the combustion air fan 6, and an auxiliary heater 8 arranged in the catalytic combustion bed 5, the controller 11 adopts an existing controller, and the model is Siemens S7-200SMART, the controller 11 is used for receiving signals of the temperature sensors and controlling the start and stop of the burner 7 and the auxiliary heater 8 according to a preset temperature range, the burner 7 is used for providing heat required by the catalytic combustion bed 5, the model of the burner 7 is Maxson KINMAX-2G, the auxiliary heater 8 timely supplements heat after the burner is turned off to prevent the temperature from falling too fast, if the temperature exceeds an upper limit, the controller 11 turns off the burner 7 and starts the auxiliary heater 8 to slow down the temperature falling speed, if the temperature is lower than a lower limit, the controller 11 starts the burner 7 and turns off the auxiliary heater 8 to increase the temperature, the start and stop of the burner 7 and the auxiliary heater 8 are controlled in cycles to maintain the temperature of the catalytic combustion bed 5 in the preset range, and the stability of the purification efficiency is ensured, and finally the waste gas is discharged from the outlet through the catalytic combustion bed 5.

[0027] The use process or principle of the utility model:

[0028] For example Figures 1-2As shown, first, the exhaust gas enters the flame arrester 1 along the pipeline through the catalytic air inlet, a local pressure gauge 14 and a pressure indication controller 15 are arranged at the catalytic air inlet, so as to observe whether the pressure is stable when the air inlet, then the exhaust gas enters the CO fan 2 through the fan flexible connection 16, a frequency converter 13 is arranged at the CO fan 2, the speed of the fan is controlled by adjusting the power supply frequency of the motor, the fresh air pipeline is connected with the catalytic air inlet pipeline and the fresh air inlet 3, the fresh air pipeline is provided with a cold air supplement valve 12, the CO fan 2 is connected with the air inlet pipeline of the catalytic combustion bed 5 through the fan flexible connection 16, the air inlet pipeline of the catalytic combustion bed 5 is provided with an LEL detector 17, which can detect the concentration of the exhaust gas in real time and transmit the signal to the cold air supplement valve 12, control the opening of the cold air supplement valve 12 to adjust the concentration of the exhaust gas, and the exhaust gas flows into the catalytic combustion bed 5 from the CO fan 2 through the pipeline for catalysis; The temperature sensor is arranged on the catalytic combustion bed 5, the catalytic combustion bed 5 is provided with a burner 7, the burner 7 is connected with the combustion fan 6, the catalytic combustion bed 5 is provided with an auxiliary heater 8, the temperature sensor can monitor the temperature of the catalytic combustion bed 5 in real time and transmit the signal to the controller 11, the controller 11 judges whether the temperature of the catalytic combustion bed 5 exceeds the preset range according to the received temperature signal, when the temperature exceeds the upper limit, the controller 11 closes the burner 7 and starts the auxiliary heater 8 to slow down the temperature drop speed; When the temperature is lower than the lower limit, the controller 11 starts the burner 7 and closes the auxiliary heater 8 to increase the temperature, the start and stop of the burner 11 and the auxiliary heater 8 are controlled in cycles, so as to maintain the temperature of the catalytic combustion bed 5 in the preset range, ensure the stability of the purification efficiency, and finally the exhaust gas is discharged from the outlet of the catalytic combustion bed 5.

[0029] The above only describes the preferred embodiments of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A control device for maintaining the temperature of a catalytic combustion system stable, characterized in that: The application relates to a catalytic combustion bed (5) and a controller (11), a LEL detector (17) is arranged on a gas inlet pipeline of the catalytic combustion bed (5) and is connected with a cold supplement valve (12), the LEL detector (17) monitors exhaust gas concentration, controls the opening degree of the cold supplement valve (12) to adjust the exhaust gas concentration, a temperature sensor is arranged on the catalytic combustion bed (5) and monitors the temperature of the catalytic combustion bed (5) in real time, and signals are transmitted to the controller (11).

2. The control device for maintaining the temperature of a catalytic combustion system stable according to claim 1, characterized in that: The temperature sensor comprises a preheating temperature element (9) and a reaction temperature element (10), the preheating temperature element (9) is arranged on the catalytic combustion bed (5) and monitors the preheating temperature of exhaust gas in the catalytic combustion bed (5), and the reaction temperature element (10) is arranged on the main body of the catalytic combustion bed (5) and measures the reaction temperature in the catalytic combustion bed (5).

3. The control device for maintaining the temperature of a catalytic combustion system according to claim 1, characterized by: An auxiliary heater (8) is arranged in the catalytic combustion bed (5).

4. The control device for maintaining the temperature of a catalytic combustion system according to claim 1, characterized by: The catalytic combustion bed (5) is provided with a burner (7), and the burner (7) is connected with a combustion air fan (6).

5. The control device for maintaining the temperature of a catalytic combustion system stable according to claim 1, characterized in that: A CO fan (2) is arranged at the gas inlet pipeline of the catalytic combustion bed (5).

6. The control device for maintaining the temperature of a catalytic combustion system stable according to claim 5, characterized in that: The CO fan (2) is connected with a flame arrester (1), and the flame arrester (1) is arranged on a catalytic gas inlet pipeline.

7. The control device for maintaining the temperature of a catalytic combustion system stable according to claim 6, characterized in that: A fresh air pipeline and a fresh air inlet (3) are connected with the catalytic gas inlet pipeline, and the fresh air pipeline is provided with the cold supplement valve (12).

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