Mulching film combustion tail gas treatment device and method
By designing a multi-stage series-connected reactor and step-by-step temperature control method, the problem of catalyst instability is solved, and the long-term stable operation and environmentally friendly treatment effect of the plastic film combustion exhaust treatment device are achieved.
Patent Information
- Application Number
- CN202510254478.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2025-05-09
AI Technical Summary
In the prior art, the catalyst is unstable during the treatment of the plastic film combustion exhaust gas, and it is prone to poisoning, carbon deposits or inactivation in high temperature and high concentration environments, affecting the long-term stability of the exhaust gas treatment.
A plastic combustion exhaust gas treatment device is designed, using a multi-stage series connected reactor, each reactor is equipped with a exhaust gas injection tube. By starting step by step and controlling the exhaust gas injection amount, the temperature of each reactor is stable between 430°C and 450°C, and avoiding damage to the catalyst by excessive local temperature.
Through the design of multi-stage tandem reactors and step by step temperature control, the instability of the catalyst is effectively avoided, the long-term and stable operation of the plastic combustion exhaust treatment device is ensured, and the harm to the environment is reduced.
Smart Images
Figure CN119957924A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of agricultural waste treatment, and in particular to a device and method for treating tail gas from film burning. Background Art
[0002] In agriculture, mulch film is often used on a large scale to increase the temperature and moisture retention of the soil, but the mulch film remaining in the soil takes hundreds of years to decompose. If the mulch film is not treated, the residual film will be mixed with the soil to form an airtight and non-moisture-returning compacted layer in the top 30 cm of the cultivated land, which restricts the soil's reproduction capacity, is not conducive to the normal growth and development of crops, and may even pollute groundwater. In order to deal with waste mulch film, incineration is usually used to treat waste agricultural mulch film, but the exhaust gas after the mulch film is burned contains harmful substances, and the direct discharge of the mulch film combustion exhaust gas will cause harm to the environment. In the prior art, the catalytic oxidation of the catalyst is often used to remove harmful substances in the mulch film combustion exhaust gas, but under catalytic conditions and at a suitable temperature, the combustion reaction of the mulch film combustion exhaust gas is very intense. In an environment with high temperature and high concentration of harmful substances, the catalyst may be poisoned, carbonized or deactivated, affecting the long-term stable operation of the mulch film combustion exhaust gas. Summary of the invention
[0003] In view of the defects existing in the prior art, the present application provides a device and method for treating tail gas from film combustion to solve technical problems such as catalyst instability in the process of treating tail gas from film combustion in the prior art.
[0004] In order to achieve the purpose of the above invention, the technical solution provided by the present invention is as follows:
[0005] A film burning tail gas treatment device comprises a multi-stage series-connected reactor, one end of the reactor is provided with an air inlet, the other end of the reactor is provided with an air outlet, the air inlet of the first-stage reactor is connected with a three-way valve, the other two inlets of the three-way valve are respectively connected with the outlet of a hot air blower and the outlet of a combustion-supporting air blower, an exhaust pipe is provided on the air outlet of the last-stage reactor, a first exhaust gas discharge pipe and a second exhaust gas discharge pipe are provided on the exhaust pipe, and the port of the first exhaust gas discharge pipe is open upward;
[0006] The reactor is provided with a mixing chamber and a catalytic layer in sequence along the direction of gas flow, the mixing chamber is used to mix the film combustion exhaust gas and air, an exhaust gas injection pipe is inserted in the mixing chamber for injecting the film combustion exhaust gas into the mixing chamber, a catalyst for catalytic oxidation of the mixed gas is arranged in the catalytic layer, an air inlet is arranged at one end of the mixing chamber, the other end of the mixing chamber is communicated with the catalytic layer, the catalytic layer is communicated with the air outlet, a temperature measuring unit for measuring the catalyst temperature is arranged above the catalytic layer, the exhaust gas injection pipe is communicated with the second exhaust gas emission pipe, an intake valve is arranged on the exhaust gas injection pipe, the intake valve is electrically connected to the control system, and the control system adjusts the opening of the intake valve according to the temperature monitored by the temperature measuring unit.
[0007] In one embodiment, a steel wire mat is provided in the gas mixing chamber.
[0008] In one embodiment, the reactor is in a cylindrical shape, the catalyst is in a honeycomb shape, and the distance between the inner wall of the reactor and the outer surface of the catalyst is less than 0.3 mm.
[0009] In one embodiment, a thermal insulation layer is disposed outside the reactor.
[0010] In one embodiment, the pipe mouth of the tail gas injection pipe in the reactor is arranged opposite to the gas inlet, and a nozzle is arranged at the end of the pipe mouth of the tail gas injection pipe.
[0011] In one embodiment, the film combustion exhaust gas treatment device is in the shape of a gate, and three reactors are arranged on the left and right sides of the film combustion exhaust gas treatment device, and the reactors are connected through connecting pipes.
[0012] This embodiment also provides a method for treating tail gas from film combustion, using the above-mentioned tail gas treatment device from film combustion, comprising the following steps:
[0013] S1. Preheating the film combustion tail gas treatment device: Start the hot air blower to deliver hot air at a temperature of 185-195°C to the film combustion tail gas treatment device. The hot air is delivered to each level of reactor in turn. The hot air is delivered continuously for a period of time until the temperature of the catalyst in each level of reactor reaches above 170°C, in preparation for the subsequent catalytic oxidation reaction of the film combustion tail gas. Then, the hot air blower is turned off and the combustion-supporting blower is started to continuously deliver air to the film combustion tail gas treatment device.
[0014] S2, start the reactor step by step:
[0015] S201, open the valve on the tail gas injection pipe in the primary reactor, and deliver the film combustion tail gas to the primary reactor. The film combustion tail gas undergoes a chemical reaction in the primary reactor. Adjust the valve opening on the tail gas injection pipe in the primary reactor to maintain the temperature of the primary reactor stable between 430-450° C. The film combustion tail gas after combustion in the primary reactor and the film combustion that does not participate in the reaction enter the next stage reactors, and also bring part of the heat into the next stage reactors;
[0016] S202, when the temperature of the primary reactor is stabilized at 430-450°C for a period of time, while maintaining the temperature of the primary reactor stable, open the valve on the tail gas injection pipe in the secondary reactor to transport the film combustion tail gas to the secondary reactor, the film combustion tail gas undergoes a chemical reaction in the secondary reactor, adjust the valve opening on the tail gas injection pipe in the secondary reactor, maintain the temperature of the secondary reactor stable at 430-450°C and slightly higher than the temperature of the primary reactor, the film combustion tail gas after combustion in the secondary reactor and the film combustion that does not participate in the reaction enter the next stage reactors, and also bring part of the heat into the next stage reactors. After the secondary reactor is started, the temperature of the subsequent reactors is increased;
[0017] S203, when the temperature of the primary and secondary reactors is stable, the valve openings on the tail gas injection pipes in the primary and secondary reactors are fixed, the valve on the tail gas injection pipe in the tertiary reactor is opened, and the film combustion tail gas is transported to the tertiary reactor. The film combustion tail gas undergoes a chemical reaction in the tertiary reactor, and the valve opening on the tail gas injection pipe in the tertiary reactor is adjusted to maintain the temperature of the tertiary reactor stable between 430-450°C. The temperature of the tertiary reactor is close to that of the secondary reactor and higher than that of the primary reactor. The film combustion tail gas after combustion in the tertiary reactor and the film combustion that does not participate in the reaction enter the next stage reactors, and also bring part of the heat into the next stage reactors;
[0018] S204, when the temperature of the first to third reactors is stable, the valve openings on the tail gas injection pipes in the first to third reactors are fixed, the valve on the tail gas injection pipe in the fourth reactor is opened, and the film combustion tail gas is transported to the fourth reactor. The film combustion tail gas undergoes a chemical reaction in the fourth reactor, and the valve opening on the tail gas injection pipe in the fourth reactor is adjusted to maintain the temperature of the fourth reactor stable between 430-450°C. The temperature of the fourth reactor is close to that of the third reactor and higher than that of the first and second reactors. The film combustion tail gas after combustion in the fourth reactor and the film combustion that does not participate in the reaction enter the next two reactors, and also bring part of the heat into the next two reactors;
[0019] S205, when the temperature of the first to fourth stage reactors is stable, the valve opening on the tail gas injection pipe in the first to fourth stage reactors is fixed, the valve on the tail gas injection pipe in the fifth stage reactor is opened, and the film combustion tail gas is transported to the fifth stage reactor. The film combustion tail gas undergoes a chemical reaction in the fifth stage reactor, and the valve opening on the tail gas injection pipe in the fifth stage reactor is adjusted to maintain the temperature of the fifth stage reactor stable between 430-450° C. The temperature of the fifth stage reactor is close to that of the second to fourth stage reactors, and the film combustion tail gas after combustion in the fifth stage reactor and the film combustion tail gas that does not participate in the reaction enter the sixth stage reactor, and also bring part of the heat into the sixth stage reactor;
[0020] S206. When the temperature of the first to fifth reactors is stable, the valve openings on the tail gas injection pipes in the first to fifth reactors are fixed, the valve on the tail gas injection pipe in the sixth reactor is opened, and the tail gas from the film combustion is transported to the sixth reactor. The tail gas from the film combustion undergoes a chemical reaction in the sixth reactor, and the valve opening on the tail gas injection pipe in the sixth reactor is adjusted to maintain the temperature of the sixth reactor stable between 430° C. and 450° C.;
[0021] S3. Emission of waste gas: When each level of reactor is started, the CO2 after the combustion of the film combustion exhaust gas is discharged into the air through the first exhaust gas emission pipe due to its low density. The film combustion exhaust gas that does not participate in the reaction enters the reactor again through the first exhaust gas emission pipe and the exhaust gas injection pipe to participate in the reaction.
[0022] In one embodiment, the temperature of the first-stage reactor in S201 is finally stabilized and controlled at 433°C, and the temperatures of the second-stage and third-stage burners are increased. The temperature of the second-stage reactor is increased to 353°C, the temperature of the third-stage reactor is increased to 266°C, and the temperatures of other subsequent reactors are all above 200°C; the temperature of the second-stage reactor in S202 is finally stabilized and controlled at 440°C. After the second-stage reactor is started, the temperature of the third-stage reactor is increased to 353°C, and the temperature of the fourth-stage reactor is increased to 273°C; the temperature of the third-stage reactor in S203 is finally stabilized at 443°C, and the temperature of the first to third stages is increased. When the reactors are working stably at the same time, the temperature of the fourth-stage reactor rises to 357°C, the temperature of the fifth-stage reactor rises to 289°C, and the temperature of the sixth-stage reactor rises to above 230°C; the temperature of the fourth-stage reactor in S204 is finally stabilized at 447°C, and when the first to fourth-stage reactors are working stably at the same time, the temperature of the fifth-stage reactor rises to 356°C, and the temperature of the sixth-stage reactor rises to 300°C; the temperature of the fifth-stage reactor in S205 is finally stabilized at 445°C, the temperatures of the second to fourth-stage reactors are all at 445°C, the temperature of the first-stage reactor is 439°C, and the temperature of the sixth-stage reactor rises to 359°C.
[0023] Compared with the prior art, this application has at least the following beneficial effects:
[0024] The film combustion tail gas treatment device in the present application includes a multi-stage series-connected reactor, each reactor is provided with a tail gas injection pipe for conveying the film combustion tail gas, so that the input amount of the film combustion tail gas of each reactor can be individually controlled, and the air inlet of the first-stage reactor can be connected to the outlet of the hot air blower and the outlet of the combustion-supporting air blower, so that the entire film combustion tail gas treatment device can be preheated before the reactor is started, the gas circulation process of the internal process is optimized, and the heat dissipation effect is improved;
[0025] The exhaust pipe is not only provided with a first exhaust gas discharge pipe for discharging CO2, but also provided with a second exhaust gas discharge pipe for reintroducing the film combustion tail gas that has not participated in the reaction into the reactor, thereby reducing the harm of the film combustion tail gas treatment to the environment;
[0026] The method for treating exhaust gas from film combustion in the present application realizes temperature control of each stage of reactors by gradually starting the exhaust gas intake valves of the film high-temperature combustion-supporting combustion exhaust gas and appropriately controlling the air intake volume of each valve, so that the reaction temperature of each stage of reactor is stabilized between 430°C and 450°C, ensuring that the reaction proceeds in an orderly manner, effectively avoiding damage to the catalyst life due to excessive local temperature, and ensuring the stability and life of the film combustion exhaust gas treatment device. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a structural schematic diagram of a film combustion tail gas treatment device in an embodiment of the present application;
[0028] Figure 2 It is a schematic diagram of the structure of the reactor in the embodiment of the present application;
[0029] Figure 3 It is a schematic diagram of the structure of the catalyst in the examples of the present application.
[0030] Figure numerals: 1. Reactor; 101. Tail gas injection pipe; 102. Mixing chamber; 103. Air inlet; 104. Catalytic layer; 105. Catalyst; 106. Temperature measuring unit; 107. Air outlet; 108. Steel wire mat; 2. Connecting pipe; 3. Exhaust pipe; 301. First exhaust gas discharge pipe; 302. Second exhaust gas discharge pipe; 4. Hot air blower; 5. Combustion-supporting air blower. DETAILED DESCRIPTION
[0031] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.
[0032] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.
[0033] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms and should not be understood as indicating or implying relative importance. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".
[0034] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.
[0035] In order to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings.
[0036] like Figure 1 As shown, this embodiment provides a film combustion exhaust gas treatment device, including a plurality of reactors connected in series, an air inlet 103 is provided at one end of the reactor 1, and an air outlet 107 is provided at the other end of the reactor 1, the air inlet 103 of the first-stage reactor 1 is connected to a three-way valve, and the other two inlets of the three-way valve are respectively connected to the outlet of the hot air blower 4 and the outlet of the combustion-supporting fan 5, an exhaust pipe 3 is provided on the air outlet 107 of the final projector, and a first exhaust gas discharge pipe 301 and a second exhaust gas discharge pipe 302 are provided on the exhaust pipe 3, and the port of the first exhaust gas discharge pipe 301 is open upward.
[0037] like Figure 2As shown, the reactor 1 is provided with a mixing chamber 102 and a catalytic layer 104 in sequence along the direction of gas flow. The mixing chamber 102 is used to mix the film combustion exhaust gas and air. An exhaust gas injection pipe 101 is inserted in the mixing chamber 102 for injecting the film combustion exhaust gas into the mixing chamber 102. A catalyst 105 for catalytic oxidation of the mixed gas is provided in the catalytic layer 104. An air inlet 103 is provided at one end of the mixing chamber 102, and the other end of the mixing chamber 102 is communicated with the catalytic layer 104. The catalytic layer 104 is communicated with the air outlet 107. A temperature measuring unit 106 for measuring the catalyst temperature is provided above the catalytic layer 104. The exhaust gas injection pipe 101 is communicated with the second exhaust gas emission pipe 302. An air intake valve is provided on the exhaust gas injection pipe 101. The air intake valve is electrically connected to the control system. The control system adjusts the opening of the air intake valve according to the temperature monitored by the temperature measuring unit 106.
[0038] A steel wire mat 108 is provided in the gas mixing chamber 102. When the exhaust gas and the combustion-supporting air pass through the steel wire mat 108, the porous structure of the steel wire mat 108 will break the laminar flow state of the airflow and generate turbulence, so that the two can be mixed more fully, which helps to improve the efficiency of the combustion reaction and ensure that the combustible components (such as CO, VOCs) in the exhaust gas fully react with oxygen. On the other hand, the steel wire mat 108 has good thermal conductivity, and the heat generated by the reaction of the catalyst layer 104 can preheat the mixed gas through the steel wire mat 108.
[0039] like Figure 3 As shown, the reactor 1 is cylindrical, and the catalyst 105 is honeycomb-shaped. The honeycomb-shaped catalyst has a large surface area, which increases the contact between the gas and the catalyst, and the honeycomb cylindrical shape reduces the gas flow resistance, thereby reducing the energy consumption of the entire film combustion exhaust gas treatment device. In this embodiment, the distance between the inner wall of the reactor 1 and the outer surface of the catalyst 105 is less than 0.3 mm, so that the exhaust gas can contact and react with the catalyst as much as possible.
[0040] In order to reduce heat loss, an insulation layer is provided on the outside of the reactor 1 to reduce heat loss and improve energy utilization efficiency. The tail gas from film combustion is transported to the reactor in sequence according to the number of reactors. In order to avoid overheating and burning of the catalyst due to heat accumulation in the catalyst when the film combustion tail gas treatment device is working, when the reactor is working, the control system adjusts the opening of the intake valve according to the temperature monitored by the temperature measuring unit to maintain the working temperature of the reactor 1 at 200℃-600℃.
[0041] The tail gas injection pipe 101 in the reactor 1 is disposed at an orifice opposite to the air inlet 103, so that the air can disperse the tail gas, which is conducive to the air carrying the high-temperature film combustion tail gas into the catalytic layer 104 to improve the combustion efficiency. A nozzle is provided at the end of the tail gas injection pipe 101 to promote the mixing of the tail gas and the air and improve the reaction efficiency.
[0042] In this embodiment, the film combustion exhaust gas treatment device includes six reactors. In order to reduce the floor space occupied by the film combustion exhaust gas treatment device, the film combustion exhaust gas treatment device is in the shape of a door, with three reactors arranged on each side, and the reactors are connected through connecting pipes 2.
[0043] This embodiment also provides a method for treating tail gas from film combustion, using the above-mentioned tail gas treatment device from film combustion, comprising the following steps:
[0044] S1. Preheating the film combustion tail gas treatment device: Start the hot air blower 4 to deliver hot air at a temperature of 185-195°C to the film combustion tail gas treatment device. The hot air is sequentially delivered to each level of reactor 1. The hot air is continuously delivered for a period of time until the temperature of the catalyst 105 in each level of reactor 1 reaches above 170°C, in preparation for the subsequent catalytic oxidation reaction of the film combustion tail gas. The hot air blower is then turned off and the combustion-supporting blower 5 is started to continuously deliver air to the film combustion tail gas treatment device.
[0045] S2, start the reactor step by step:
[0046] S201, open the valve on the tail gas injection pipe in the primary reactor, and deliver the film combustion tail gas to the primary reactor. The film combustion tail gas undergoes a chemical reaction in the primary reactor. Adjust the valve opening on the tail gas injection pipe in the primary reactor to maintain the temperature of the primary reactor stable between 430-450° C. The film combustion tail gas after combustion in the primary reactor and the film combustion that does not participate in the reaction enter the next stage reactors, and also bring part of the heat into the next stage reactors;
[0047] S202, when the temperature of the primary reactor is stabilized at 430-450°C for a period of time, while maintaining the temperature of the primary reactor stable, open the valve on the tail gas injection pipe in the secondary reactor to transport the film combustion tail gas to the secondary reactor, the film combustion tail gas undergoes a chemical reaction in the secondary reactor, adjust the valve opening on the tail gas injection pipe in the secondary reactor, maintain the temperature of the secondary reactor stable at 430-450°C and slightly higher than the temperature of the primary reactor, the film combustion tail gas after combustion in the secondary reactor and the film combustion that does not participate in the reaction enter the next stage reactors, and also bring part of the heat into the next stage reactors. After the secondary reactor is started, the temperature of the subsequent reactors is increased;
[0048] S203, when the temperature of the primary and secondary reactors is stable, the valve openings on the tail gas injection pipes in the primary and secondary reactors are fixed, the valve on the tail gas injection pipe in the tertiary reactor is opened, and the film combustion tail gas is transported to the tertiary reactor. The film combustion tail gas undergoes a chemical reaction in the tertiary reactor, and the valve opening on the tail gas injection pipe in the tertiary reactor is adjusted to maintain the temperature of the tertiary reactor stable between 430-450°C. The temperature of the tertiary reactor is close to that of the secondary reactor and higher than that of the primary reactor. The film combustion tail gas after combustion in the tertiary reactor and the film combustion that does not participate in the reaction enter the next stage reactors, and also bring part of the heat into the next stage reactors;
[0049] S204, when the temperature of the first to third reactors is stable, the valve openings on the tail gas injection pipes in the first to third reactors are fixed, the valve on the tail gas injection pipe in the fourth reactor is opened, and the film combustion tail gas is transported to the fourth reactor. The film combustion tail gas undergoes a chemical reaction in the fourth reactor, and the valve opening on the tail gas injection pipe in the fourth reactor is adjusted to maintain the temperature of the fourth reactor stable between 430-450°C. The temperature of the fourth reactor is close to that of the third reactor and higher than that of the first and second reactors. The film combustion tail gas after combustion in the fourth reactor and the film combustion that does not participate in the reaction enter the next two reactors, and also bring part of the heat into the next two reactors;
[0050] S205, when the temperature of the first to fourth stage reactors is stable, the valve opening on the tail gas injection pipe in the first to fourth stage reactors is fixed, the valve on the tail gas injection pipe in the fifth stage reactor is opened, and the film combustion tail gas is transported to the fifth stage reactor. The film combustion tail gas undergoes a chemical reaction in the fifth stage reactor, and the valve opening on the tail gas injection pipe in the fifth stage reactor is adjusted to maintain the temperature of the fifth stage reactor stable between 430-450° C. The temperature of the fifth stage reactor is close to that of the second to fourth stage reactors, and the film combustion tail gas after combustion in the fifth stage reactor and the film combustion tail gas that does not participate in the reaction enter the sixth stage reactor, and also bring part of the heat into the sixth stage reactor;
[0051] S206. When the temperature of the first to fifth reactors is stable, the valve openings on the tail gas injection pipes in the first to fifth reactors are fixed, the valve on the tail gas injection pipe in the sixth reactor is opened, and the tail gas from the film combustion is transported to the sixth reactor. The tail gas from the film combustion undergoes a chemical reaction in the sixth reactor, and the valve opening on the tail gas injection pipe in the sixth reactor is adjusted to maintain the temperature of the sixth reactor stable between 430° C. and 450° C.;
[0052] S3. Emission of waste gas: When each level of reactor is started, the CO2 after the film combustion exhaust gas is discharged into the air through the first exhaust gas emission pipe 301 due to its low density, and the film combustion exhaust gas that has not participated in the reaction enters the reactor again through the first exhaust gas emission pipe 301 and the exhaust gas injection pipe 101 to participate in the reaction.
[0053] By starting the intake valves of the high-temperature combustion-supporting tail gas of the ground film step by step and properly controlling the intake volume of each valve, the temperature of each reactor can be controlled, so that the reaction temperature of each reactor is stabilized between 430℃ and 450℃, ensuring the orderly reaction and effectively avoiding damage to the catalyst life due to excessive local temperature. The test results show that the ignition temperature can be controlled at around 190℃, the temperature of each reactor can be stably controlled between 430℃ and 450℃, the combustion process is stable, the intake speed of the high-temperature combustion-supporting tail gas of the ground film and the combustion-supporting air is controllable, and the long-term harmless treatment of the high-temperature combustion-supporting tail gas of the ground film can be achieved.
[0054] In this embodiment, the temperature of the primary reactor in S201 is finally stably controlled at 433°C, and the temperatures of the secondary and tertiary burners have increased. The temperature of the secondary reactor has risen to 353°C, and the temperature of the tertiary reactor has risen to 266°C. The temperatures of other subsequent reactors have all reached above 200°C, which shows that the heat released by the primary reactor can be effectively transferred backward. When the temperature displayed by the temperature measuring unit 106 in the primary reactor exceeds 430°C, reduce the valve opening on the tail gas injection pipe to reduce the amount of film combustion tail gas entering the primary reactor to ensure that the temperature in the primary reactor does not exceed 450°C;
[0055] The temperature of the secondary reactor in S202 was finally stably controlled at 440°C. After the secondary reactor was started, the temperature of the tertiary reactor increased to 353°C, and the temperature of the fourth reactor increased to 273°C. The temperature increases of the fifth and sixth reactors were not obvious, which indicates that the heat transfer effect between the secondary reactor and the tertiary reactor is obvious.
[0056] The temperature of the third-stage reactor in S203 finally stabilized at 443°C. When the first to third-stage reactors were working stably at the same time, the temperature of the fourth-stage reactor rose to 357°C, the temperature of the fifth-stage reactor rose to 289°C, and the temperature of the sixth-stage reactor rose to above 230°C. The temperature distribution difference of the entire reaction system became smaller, which was conducive to more effective utilization of the generated heat.
[0057] The temperature of the fourth-stage reactor in S204 finally stabilized at 447°C. When the first to fourth-stage reactors were working stably at the same time, the temperature of the fifth-stage reactor rose to 356°C, and the temperature of the sixth-stage reactor rose to 300°C.
[0058] The temperature of the fifth-stage reactor in S205 finally stabilized at 445°C, the temperatures of the second to fourth-stage reactors were all at 445°C, the temperature of the first-stage reactor was 439°C, and the temperature of the sixth-stage reactor rose to 359°C.
[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.
Claims
1. A film combustion tail gas treatment device, characterized in that: It comprises a plurality of reactors connected in series, one end of the reactor is provided with an air inlet, the other end of the reactor is provided with an air outlet, the air inlet of the first-stage reactor is connected with a three-way valve, the other two inlets of the three-way valve are respectively connected with the outlet of the hot air blower and the outlet of the combustion-supporting air blower, an exhaust pipe is provided on the air outlet of the last-stage reactor, the exhaust pipe is provided with a first exhaust gas discharge pipe and a second exhaust gas discharge pipe, and the port of the first exhaust gas discharge pipe is open upward; The reactor is provided with a mixing chamber and a catalytic layer in sequence along the direction of gas flow, the mixing chamber is used to mix the film combustion exhaust gas and air, an exhaust gas injection pipe is inserted in the mixing chamber for injecting the film combustion exhaust gas into the mixing chamber, a catalyst for catalytic oxidation of the mixed gas is arranged in the catalytic layer, an air inlet is arranged at one end of the mixing chamber, the other end of the mixing chamber is communicated with the catalytic layer, the catalytic layer is communicated with the air outlet, a temperature measuring unit for measuring the catalyst temperature is arranged above the catalytic layer, the exhaust gas injection pipe is communicated with the second exhaust gas emission pipe, an intake valve is arranged on the exhaust gas injection pipe, the intake valve is electrically connected to the control system, and the control system adjusts the opening of the intake valve according to the temperature monitored by the temperature measuring unit.
2. The film combustion tail gas treatment device according to claim 1 is characterized in that: A steel wire pad is arranged in the gas mixing chamber.
3. The film combustion tail gas treatment device according to claim 1 is characterized in that: The reactor is in a cylindrical shape, the catalyst is in a honeycomb shape, and the distance between the inner wall of the reactor and the outer surface of the catalyst is less than 0.3 mm.
4. The film combustion tail gas treatment device according to claim 1 is characterized in that: A heat-insulating layer is arranged outside the reactor.
5. The film combustion tail gas treatment device according to claim 1, characterized in that: The pipe opening of the tail gas injection pipe in the reactor is arranged opposite to the air inlet, and a nozzle is arranged at the end of the pipe opening of the tail gas injection pipe.
6. The film combustion tail gas treatment device according to claim 1, characterized in that: The film combustion tail gas treatment device is in the shape of a gate, and three reactors are arranged on the left and right sides of the film combustion tail gas treatment device, and the reactors are connected through connecting pipes.
7. A method for treating tail gas from film combustion, characterized in that: The film combustion tail gas treatment device as claimed in claim 6 comprises the following steps: S1. Preheating the film combustion tail gas treatment device: Start the hot air blower to deliver hot air at a temperature of 185-195°C to the film combustion tail gas treatment device. The hot air is delivered to each level of reactor in turn. The hot air is delivered continuously for a period of time until the temperature of the catalyst in each level of reactor reaches above 170°C, in preparation for the subsequent catalytic oxidation reaction of the film combustion tail gas. Then, the hot air blower is turned off and the combustion-supporting blower is started to continuously deliver air to the film combustion tail gas treatment device. S2, start the reactor step by step: S201, open the valve on the tail gas injection pipe in the primary reactor, and deliver the film combustion tail gas to the primary reactor. The film combustion tail gas undergoes a chemical reaction in the primary reactor. Adjust the valve opening on the tail gas injection pipe in the primary reactor to maintain the temperature of the primary reactor stable between 430-450° C. The film combustion tail gas after combustion in the primary reactor and the film combustion that does not participate in the reaction enter the next stage reactors, and also bring part of the heat into the next stage reactors; S202, when the temperature of the primary reactor is stabilized at 430-450°C for a period of time, while maintaining the temperature of the primary reactor stable, open the valve on the tail gas injection pipe in the secondary reactor to transport the film combustion tail gas to the secondary reactor, the film combustion tail gas undergoes a chemical reaction in the secondary reactor, adjust the valve opening on the tail gas injection pipe in the secondary reactor, maintain the temperature of the secondary reactor stable at 430-450°C and slightly higher than the temperature of the primary reactor, the film combustion tail gas after combustion in the secondary reactor and the film combustion that does not participate in the reaction enter the next stage reactors, and also bring part of the heat into the next stage reactors. After the secondary reactor is started, the temperature of the subsequent reactors is increased; S203, when the temperature of the primary and secondary reactors is stable, the valve openings on the tail gas injection pipes in the primary and secondary reactors are fixed, the valve on the tail gas injection pipe in the tertiary reactor is opened, and the film combustion tail gas is transported to the tertiary reactor. The film combustion tail gas undergoes a chemical reaction in the tertiary reactor, and the valve opening on the tail gas injection pipe in the tertiary reactor is adjusted to maintain the temperature of the tertiary reactor stable between 430-450°C. The temperature of the tertiary reactor is close to that of the secondary reactor and higher than that of the primary reactor. The film combustion tail gas after combustion in the tertiary reactor and the film combustion that does not participate in the reaction enter the next stage reactors, and also bring part of the heat into the next stage reactors; S204, when the temperature of the first to third reactors is stable, the valve openings on the tail gas injection pipes in the first to third reactors are fixed, the valve on the tail gas injection pipe in the fourth reactor is opened, and the film combustion tail gas is transported to the fourth reactor. The film combustion tail gas undergoes a chemical reaction in the fourth reactor, and the valve opening on the tail gas injection pipe in the fourth reactor is adjusted to maintain the temperature of the fourth reactor stable between 430-450°C. The temperature of the fourth reactor is close to that of the third reactor and higher than that of the first and second reactors. The film combustion tail gas after combustion in the fourth reactor and the film combustion that does not participate in the reaction enter the next two reactors, and also bring part of the heat into the next two reactors; S205, when the temperature of the first to fourth stage reactors is stable, the valve opening on the tail gas injection pipe in the first to fourth stage reactors is fixed, the valve on the tail gas injection pipe in the fifth stage reactor is opened, and the film combustion tail gas is transported to the fifth stage reactor. The film combustion tail gas undergoes a chemical reaction in the fifth stage reactor, and the valve opening on the tail gas injection pipe in the fifth stage reactor is adjusted to maintain the temperature of the fifth stage reactor stable between 430-450° C. The temperature of the fifth stage reactor is close to that of the second to fourth stage reactors, and the film combustion tail gas after combustion in the fifth stage reactor and the film combustion tail gas that does not participate in the reaction enter the sixth stage reactor, and also bring part of the heat into the sixth stage reactor; S206. When the temperature of the first to fifth reactors is stable, the valve openings on the tail gas injection pipes in the first to fifth reactors are fixed, the valve on the tail gas injection pipe in the sixth reactor is opened, and the tail gas from the film combustion is transported to the sixth reactor. The tail gas from the film combustion undergoes a chemical reaction in the sixth reactor, and the valve opening on the tail gas injection pipe in the sixth reactor is adjusted to maintain the temperature of the sixth reactor stable between 430° C. and 450° C.; S3. Emission of waste gas: When each level of reactor is started, the CO2 after the combustion of the film combustion exhaust gas is discharged into the air through the first exhaust gas emission pipe due to its low density. The film combustion exhaust gas that does not participate in the reaction enters the reactor again through the first exhaust gas emission pipe and the exhaust gas injection pipe to participate in the reaction.
8. The method for treating tail gas from film combustion according to claim 1, characterized in that: The temperature of the first-stage reactor in S201 is finally stabilized and controlled at 433°C, and the temperatures of the second-stage and third-stage burners are increased. The temperature of the second-stage reactor rises to 353°C, the temperature of the third-stage reactor rises to 266°C, and the temperatures of other subsequent reactors all reach above 200°C; the temperature of the second-stage reactor in S202 is finally stabilized and controlled at 440°C. After the second-stage reactor is started, the temperature of the third-stage reactor rises to 353°C, and the temperature of the fourth-stage reactor rises to 273°C; the temperature of the third-stage reactor in S203 is finally stabilized at 443°C, and the first to third-stage reactors are the same When the reactor is working stably at the same time, the temperature of the fourth-stage reactor rises to 357°C, the temperature of the fifth-stage reactor rises to 289°C, and the temperature of the sixth-stage reactor rises to above 230°C; the temperature of the fourth-stage reactor in S204 is finally stabilized at 447°C, and when the first to fourth-stage reactors are working stably at the same time, the temperature of the fifth-stage reactor rises to 356°C, and the temperature of the sixth-stage reactor rises to 300°C; the temperature of the fifth-stage reactor in S205 is finally stabilized at 445°C, the temperatures of the second to fourth-stage reactors are all at 445°C, the temperature of the first-stage reactor is 439°C, and the temperature of the sixth-stage reactor rises to 359°C.