Tail gas incineration device and method

Abstract

The invention discloses a tail gas incineration device and method, and belongs to the technical field of tail gas incineration, the tail gas incineration device comprises an incinerator body and a combustor, the incinerator body is provided with a hearth, and the interior of the hearth is sequentially provided with a first area, a second area and a third area in the axial direction of the hearth; the incinerator body comprises a secondary inlet and a tertiary inlet, the secondary inlet communicates with the second area, mixed gas of secondary air and secondary tail gas is introduced into the second area, the tertiary inlet communicates with the third area, and mixed gas of tertiary air and tertiary tail gas is introduced into the third area; the combustor is arranged at one end of the incinerator body and communicates with the first area, the combustor comprises a containing cavity and a primary air inlet and a primary tail gas inlet, the primary air inlet communicates with the containing cavity and is connected with primary air, and the primary tail gas inlet communicates with the containing cavity and is connected with primary tail gas. The invention aims to greatly reduce the concentration of CO and NOx in the flue gas discharged by the incinerator.

Description

Technical Field

[0001] The present application belongs to the technical field of tail gas incineration, and specifically relates to a tail gas incineration device and method. Background Art

[0002] At present, the concentrations of CO and NOx in the flue gas discharged by many incinerators exceed the standard, with CO ranging from 2000 to 3000 ppm and NOx converted to 150 mg / Nm 3 The above not only threatens human health, but also causes serious pollution to the environment.

[0003] There are two sources of CO in the flue gas emitted by the incinerator: 1. CO in the tail gas entering the incinerator, which comes from the CO generated by the lack of oxygen combustion of hydrocarbons in the acid gas of the sulfur-making furnace in the sulfur-making furnace, and the CO generated by the reverse water gas reaction of CO2 and H2 in the acid gas; 2. A large amount of CO generated by the lack of oxygen combustion of fuel gas in the incinerator burner. There are also two sources of NOx in the flue gas emitted by the incinerator: 1. Nitrogen-containing substances in the tail gas entering the incinerator, which come from nitrogen-containing substances generated when ammonia in the acid gas of the sulfur-making furnace is burned in the sulfur-making furnace, and are oxidized to NOx in the incinerator as fuel nitrogen; 2. Thermal NOx generated by the incinerator burner itself under high-temperature combustion conditions. Due to the large volume flow of the tail gas, the pollutants CO and NOx emitted by the incinerator are mainly derived from the tail gas, and a small part comes from the incinerator burner. In summary, it is necessary to reduce the concentration of CO and NOx in the flue gas of the incinerator. Summary of the invention

[0004] The embodiments of the present application provide a tail gas incineration device and method, which are intended to significantly reduce the concentration of CO and NOx in the flue gas emitted by an incinerator.

[0005] The embodiment of the present application provides a tail gas incineration device, comprising:

[0006] An incinerator body, wherein the incinerator body has a furnace, wherein the furnace is sequentially divided into a first area, a second area, and a third area along its axial direction; the incinerator body has a secondary inlet and a tertiary inlet, wherein the secondary inlet is communicated with the second area and is configured to receive a mixed gas of secondary air and secondary exhaust gas to the second area, and the tertiary inlet is communicated with the third area and is configured to receive a mixed gas of tertiary air and tertiary exhaust gas to the third area;

[0007] A burner is arranged at one end of the incinerator body and is connected to the first area. The burner has a accommodating cavity connected to the first area, and the burner includes a primary air inlet and a primary exhaust gas inlet. The primary air inlet is connected to the accommodating cavity and is configured to receive primary air, and the primary exhaust gas inlet is connected to the accommodating cavity and is configured to receive primary exhaust gas.

[0008] In some embodiments, the tail gas incineration device further comprises a first distribution cavity, which is disposed on the incinerator body and is located in the second area;

[0009] A first through hole is circumferentially formed on one side of the first distribution cavity toward the interior of the furnace, and a side of the first distribution cavity away from the first through hole is connected to the secondary inlet, so that a mixed gas of secondary air and secondary exhaust gas introduced into the secondary inlet can be sprayed into the second area from the first through hole.

[0010] In some embodiments, the tail gas incineration device further comprises a second distribution cavity, which is disposed on the incinerator body and is located in the third area;

[0011] The second distribution cavity has a second through hole circumferentially disposed on one side facing the interior of the furnace, and the second distribution cavity is connected to the tertiary inlet on a side away from the second through hole, so that a mixed gas of tertiary air and tertiary exhaust gas connected to the tertiary inlet can be sprayed into the third area from the second through hole.

[0012] In some embodiments, the exhaust gas incineration device further includes a fan, and an air outlet of the fan is respectively connected to the primary air inlet, the secondary inlet, and the tertiary inlet.

[0013] In some embodiments, the amount of the primary tail gas introduced is 8% to 10% of the total tail gas, and the total tail gas is the sum of the primary tail gas, the secondary tail gas, and the tertiary tail gas.

[0014] In some embodiments, the burner further includes a pure oxygen inlet, which is in communication with the containing chamber and is configured to receive pure oxygen.

[0015] In some embodiments, the exhaust gas incineration device further includes a plurality of butterfly valves, and the primary air inlet, the primary exhaust gas inlet, and the pure oxygen inlet are all provided with the butterfly valves.

[0016] In some embodiments, the exhaust gas incineration device further includes a temperature detector, which is disposed on the incinerator body and is configured to detect the temperature in the furnace.

[0017] Accordingly, a tail gas incineration method is also provided, comprising the tail gas incineration device described above, and the tail gas incineration method comprises the following steps:

[0018] S100, the fuel gas, primary air, and primary exhaust gas are burned under oxygen in the burner and the first zone to reduce the combustion temperature and generate carbon monoxide, which is then transmitted to the second zone;

[0019] S200, inside the second region, the mixed gas of the secondary air and the secondary exhaust undergoes an oxidation reaction to generate nitrogen oxides and carbon dioxide, and the generated nitrogen oxides undergo a reduction reaction with the carbon monoxide in the inflow from the first region to generate nitrogen, which is then transmitted to the third region;

[0020] S300. Inside the third region, the mixed gas of tertiary air and tertiary exhaust undergoes an oxidation reaction to generate nitrogen oxides and carbon dioxide, and the generated nitrogen oxides undergo a reduction reaction with carbon monoxide in the inflow from the second region to generate nitrogen.

[0021] In some embodiments, the combustion temperature in the burner is W, satisfying 800°C≤W≤1300°C.

[0022] The embodiments of the present application have one of the following beneficial effects:

[0023] An exhaust gas incineration device according to an embodiment of the present application reduces the combustion temperature of the first area (main combustion reduction area) through the oxygen-deficient combustion in the first area and the mixing and oxidation reaction of the primary exhaust gas, significantly reduces the thermal NOx generated by the burner itself, and simultaneously reduces the NOx converted from the nitrogen-containing substances in the primary exhaust gas; forms a local oxidation area and a reduction area in the second area (secondary premixed flow oxidation area and reduction area), oxidizes the CO and nitrogen-containing substances in the secondary exhaust gas into CO2 and NOx, and then uses the CO in the first area to reduce the NOx to N2, thereby reducing the CO in the secondary exhaust gas and at the same time Part of the fuel-type NOx is reduced; in the third area (tertiary premixed flow oxidation zone and reduction burnout zone), the exhaust gas and air form a premixed flow and are sprayed to the center of the furnace through the circumferentially distributed radially inward spray holes, which increases the degree of mixing of pollutants (CO, H2S, COS, etc.) and oxygen, achieves more complete combustion, greatly reduces the CO in the exhaust gas and generates part of the NOx, which is then reduced by the CO in the upstream flow; finally, in the three links, the reduction of CO and the oxidation and re-reduction of nitrogen-containing substances are achieved, greatly reducing the pollutant emission values ​​in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A process schematic diagram of a tail gas incineration device provided in an embodiment of the present application;

[0026] Figure 2Another process schematic diagram of the tail gas incineration device provided in the embodiment of the present application;

[0027] Figure 3 A schematic diagram of the overall structure of the tail gas incineration device provided in the embodiment of the present application;

[0028] Figure 4 Provided for the embodiments of this application Figure 2 Enlarged view of point A in the middle;

[0029] Figure 5 Provided for the embodiments of this application Figure 3 Enlarged view of point B in the middle;

[0030] Reference numerals:

[0031] 10-incinerator body; 11-furnace; 111-first area; 112-second area; 113-third area; 12-secondary entrance; 13-tertiary entrance;

[0032] 20-burner; 21-accommodation chamber; 22-primary air inlet; 23-primary exhaust gas inlet;

[0033] 30-first distribution cavity; 31-first through hole;

[0034] 40- fan;

[0035] 50-pure oxygen inlet;

[0036] 60-Butterfly valve;

[0037] 70 - second distribution cavity; 71 - second through hole. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0039] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are an "or" relationship. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0040] Those skilled in the art will appreciate that the drawings are only schematic diagrams of example embodiments and may not be to scale. The modules or processes in the drawings are not necessarily required to implement the present application and therefore cannot be used to limit the scope of protection of the present application.

[0041] In petroleum refining, coal chemical industry, and natural gas purification enterprises, the sulfur recovery unit is one of the key environmental protection devices. It mainly processes the H2S-containing acid gas generated by the upstream desulfurization unit, low-temperature methanol washing unit, and acid water stripping unit, recovers the sulfur element, realizes the resource utilization of waste, and reduces sulfide emissions. The sulfur recovery unit is mainly composed of three parts: sulfur production combustion system, reaction condensation system, and tail gas incineration system. The sulfur production combustion system uses the conventional Claus process, and the reaction condensation system has SCOT, SuperClaus, MCRC processes, etc. according to different principles. The tail gas discharged from the sulfur production combustion system and the reaction condensation system to the tail gas incineration system contains a certain amount of sulfides such as H2S, COS, Sx, as well as H2, hydrocarbons, nitrogen-containing substances, CO, etc. These tail gases must be incinerated and purified before they can be discharged. Therefore, the tail gas incinerator is an important device in the sulfur recovery unit second only to the sulfur production furnace, and is a key link to ensure that pollutant emissions meet the standards.

[0042] Pollutant emission concentration is a key indicator for evaluating the performance of tail gas incinerators. At present, the CO and NOx concentrations in the flue gas emitted by many incinerators exceed the standard, with CO between 2000 and 3000 ppm and NOx converted to 150 mg / Nm 3The above not only threatens human health, but also causes serious pollution to the environment. Studies have shown that the generation of CO and NOx is closely related to the process design and operating parameters of the incinerator.

[0043] There are two sources of CO in the flue gas emitted by the incinerator: 1. CO in the tail gas entering the incinerator, which comes from the CO generated by the lack of oxygen combustion of hydrocarbons in the acid gas of the sulfur-making furnace in the sulfur-making furnace, and the CO generated by the reverse water gas reaction of CO2 and H2 in the acid gas; 2. A large amount of CO generated by the lack of oxygen combustion of fuel gas in the incinerator burner.

[0044] There are also two sources of NOx in the flue gas emitted by the incinerator: First, the nitrogen-containing substances in the exhaust gas entering the incinerator come from the nitrogen-containing substances generated when the ammonia in the acid gas of the sulfur-making furnace is burned in the sulfur-making furnace, and are oxidized into NOx in the incinerator as fuel nitrogen; Second, the thermal NOx generated by the incinerator burner itself under high-temperature combustion conditions.

[0045] Due to the large volume flow of tail gas, the pollutants CO and NOx finally emitted by the incinerator mainly come from the tail gas, and a small part comes from the incinerator burner.

[0046] In view of this, an embodiment of the present application provides a tail gas incineration device, which aims to significantly reduce the concentration of CO and NOx in the flue gas emitted by the incinerator.

[0047] See also Figure 1 , Figure 2 , Figure 3 , this application embodiment provides a tail gas incineration device, please refer to Figure 1 , Figure 1 A process schematic diagram of the tail gas incineration device provided in the embodiment of the present application, Figure 2 Another process schematic diagram of the tail gas incineration device provided in the embodiment of the present application, Figure 3The overall structural diagram of the tail gas incineration device provided in the embodiment of the present application. The tail gas incineration device includes an incinerator body 10 and a burner 20. The incinerator body 10 has a furnace 11, and the furnace 11 is sequentially provided with a first area 111, a second area 112, and a third area 113 along its axial direction; the incinerator body 10 has a secondary inlet 12 and a tertiary inlet 13, the secondary inlet 12 is connected to the second area 112, and is configured to receive a mixed gas of secondary air and secondary tail gas to the second area 112, and the tertiary inlet 13 is connected to the third area 113, and is configured to receive a mixed gas of tertiary air and tertiary tail gas to the third area 113. The burner 20 is arranged at one end of the incinerator body 10 and is connected to the first area 111. The burner 20 has a accommodating chamber 21 connected to the first area 111, and the burner 20 includes a primary air inlet 22 and a primary exhaust gas inlet 23. The primary air inlet 22 is connected to the accommodating chamber 21 and is configured to receive primary air, and the primary exhaust gas inlet 23 is connected to the accommodating chamber 21 and is configured to receive primary exhaust gas.

[0048] It should be noted that the furnace 11 is made of refractory bricks and has good high temperature resistance and heat conduction characteristics. This can ensure that the high temperature environment during the incineration process is stable and reliable, while extending the service life of the furnace 11. The burner 20 is a low-nitrogen burner, which can effectively control the generation of nitrogen oxides (NOx) produced during the combustion process. This helps to reduce pollution to the atmospheric environment and meets environmental protection requirements. A pure oxygen inlet 50 is provided at the front of the low-nitrogen burner to effectively increase the flue gas temperature in the furnace when incinerating low calorific value exhaust gas. This helps to promote the combustion reaction and improve combustion efficiency and thermal energy utilization. Air is fed into the incinerator through the fan 40, and a butterfly valve 60 is provided on each branch pipeline of the air and exhaust gas to accurately control the gas flow. This helps to adjust the oxygen supply and exhaust gas emissions during the combustion process to achieve the best combustion effect and emission control. By switching the butterfly valve 60, the incinerator can be switched to a variety of operating modes. This provides flexibility and adaptability, allowing the device to be adjusted according to different working conditions and needs. For example, the most suitable operation mode can be selected according to the calorific value and composition changes of the tail gas to achieve efficient tail gas treatment and energy utilization. In addition, the primary tail gas, secondary tail gas, and tertiary tail gas can be tail gas from a reaction condensation system.

[0049] In view of this, the present embodiment can effectively reduce the concentration of CO and NOx in the flue gas emitted by the incinerator. By introducing different air and tail gas mixtures into different areas of the incinerator body 10, more complete combustion and mixing can be achieved, thereby reducing the generation of CO and NOx. In addition, the setting of the burner 20 also helps to optimize the combustion process and further reduce the emission concentration of CO and NOx. The implementation of this tail gas incineration device can improve the performance of the incinerator, reduce the emission concentration of CO and NOx, thereby reducing the threat to human health and the environment, and achieving better environmental protection effects.

[0050] In some embodiments, see Figure 4 , Figure 4 Provided in the embodiments of this application Figure 2 Enlarged view of point A in the middle. The tail gas incineration device also includes a first distribution cavity 30, which is arranged on the incinerator body 10 and is located in the second area 112; a first through hole 31 is circumferentially opened on one side of the first distribution cavity 30 facing the inside of the furnace 11, and a side of the first distribution cavity 30 away from the first through hole 31 is connected to the secondary inlet 12, so that the mixed gas of the secondary air and the secondary tail gas connected to the secondary inlet 12 is sprayed into the second area 112 from the first through hole 31.

[0051] Specifically, by opening a plurality of first through holes 31 equidistantly around the first distribution cavity 30, the mixed gas can be sprayed into the second area 112 from a plurality of exit points. The advantage of this is that the mixed gas can be more evenly distributed in the second area 112, covering a wider area. This helps to ensure the full mixing of the gas and improve the combustion efficiency. The specific layout of the first through hole 31 can be adjusted according to the actual working conditions and needs. It is possible to choose to open the first through hole 31 on one or two circumferential circles of the first distribution cavity 30, and the specific number of circles depends on the size of the area to be covered and the distribution requirements of the mixed gas. Such a design can further increase the injection points of the mixed gas and improve the uniformity and comprehensiveness of the mixing. That is, by opening a plurality of first through holes 31 equidistantly on the first distribution cavity 30, the mixed gas of the secondary air and the secondary exhaust gas can be more evenly distributed in the second area 112, promoting the combustion reaction. This helps to improve the combustion efficiency and stability, and further optimize the performance of the exhaust gas incineration device.

[0052] In some embodiments, the exhaust gas incineration device also includes a second distribution chamber 70, which is arranged on the incinerator body 10 and is in the third area 113; a second through hole 71 is circumferentially opened on the side of the second distribution chamber 70 facing the interior of the furnace 11, and the side of the second distribution chamber 70 away from the second through hole 71 is connected to the tertiary inlet 13, so that the mixed gas of the tertiary air and the tertiary exhaust gas connected to the tertiary inlet can be sprayed into the third area 113 from the second through hole 71.

[0053] Specifically, by opening a plurality of second through holes 71 equidistantly around the second distribution cavity 70, the mixed gas can be sprayed into the third region 113 from a plurality of exit points. The advantage of this is that the mixed gas can be more evenly distributed in the third region 113, covering a wider area. This helps to ensure the full mixing of the gas and improve the combustion efficiency. The specific layout of the second through holes 71 can be adjusted according to the actual working conditions and needs. It is possible to choose to open the second through holes 71 on one or two circumferential circles of the second distribution cavity 70, and the specific number of circles depends on the size of the area to be covered and the distribution requirements of the mixed gas. Such a design can further increase the injection points of the mixed gas and improve the uniformity and comprehensiveness of the mixing. That is, by opening a plurality of second through holes 71 equidistantly on the second distribution cavity 70, the mixed gas of the tertiary air and the tertiary exhaust gas can be more evenly distributed in the third region 113, promoting the combustion reaction. This helps to improve the combustion efficiency and stability, and further optimize the performance of the exhaust gas incineration device.

[0054] In some embodiments, the tail gas incineration device also includes a fan 40, which is connected to the primary air inlet 22, the secondary inlet 12, and the tertiary inlet 13 respectively. It should be noted that the connection between the fan 40 and the primary air inlet 22, the secondary inlet 12, and the tertiary inlet 13 is to connect the pipe connected to the primary air inlet 22, the pipe connected to the secondary inlet 12, and the pipe connected to the tertiary inlet 13 to one pipe, which is connected to the fan 40. This means that the primary air inlet 22, the secondary inlet 12, and the tertiary inlet 13 are gathered into one pipe at a certain point or area, and then connected to the fan 40. This connection method can reduce the number and complexity of the pipes and simplify the system structure. At the same time, by bringing together the three pipes of the primary air inlet 22, the secondary inlet 12, and the tertiary inlet 13, a more uniform air distribution and a more stable airflow can be achieved, thereby improving combustion efficiency and stability. In addition, butterfly valves 60 may be provided on the three pipelines of the primary air inlet 22, the secondary inlet 12 and the tertiary inlet 13 to regulate the gases introduced into the primary air inlet 22, the secondary inlet 12 and the tertiary inlet 13 respectively. Regardless of the connection method adopted, the connection between the fan 40 and the primary air inlet 22, the secondary inlet 12 and the tertiary inlet 13 is to ensure that an appropriate amount of air is supplied to the furnace 11 to support the combustion process. This design can improve combustion efficiency, reduce the emission of harmful gases, and ensure that the gases in the furnace 11 are fully reacted in various areas, thereby achieving better environmental protection effects. The specific connection method to be selected can be determined according to specific engineering requirements and system design.

[0055] In some embodiments, the amount of primary tail gas introduced is 8% to 10% of the total tail gas, and the total tail gas is the sum of the primary tail gas, the secondary tail gas, and the tertiary tail gas. It is understandable that by controlling the amount of primary tail gas introduced within this range, the temperature of methane after combustion can be reduced to below about 1300 degrees. Such a temperature reduction can reduce the generation of thermal nitrogen oxides (NOx). Lowering the combustion temperature is an effective way to reduce the generation of thermal NOx. When the combustion temperature is reduced to a certain extent, the rate of nitrogen oxide generation in the fuel will slow down, thereby reducing NOx emissions. By controlling the amount of primary tail gas introduced, the oxygen supply and temperature distribution during the combustion process can be adjusted to achieve a reduction in the combustion temperature. It should be noted that the specific amount of primary tail gas introduced and the temperature reduction effect may be affected by many factors, such as fuel type, design and operating parameters of the combustion equipment, etc. Therefore, in practical applications, it is necessary to adjust and optimize according to the specific situation to achieve the best combustion effect and NOx emission control effect.

[0056] In some embodiments, see Figure 5 , Figure 5 Provided for the embodiments of this application Figure 3 Enlarged view at B in the middle. The burner 20 also includes a pure oxygen inlet 50, which is connected to the accommodating chamber 21 and is configured to receive pure oxygen. It should be noted that a pure oxygen inlet 50 is provided at the front of the burner 20, which is intended to effectively increase the flue gas temperature in the furnace when burning low calorific value tail gas. Such a design helps to promote the combustion reaction, improve combustion efficiency and thermal energy utilization. By introducing pure oxygen, the oxygen supply in the combustion process can be increased, thereby improving the combustion efficiency. Pure oxygen has a higher oxygen concentration and a higher oxygen content than the air, so it can react more fully with the fuel and promote the combustion reaction. This helps to improve the combustion efficiency, make the fuel burn more fully, and reduce the generation of unburned substances. In addition, by arranging a pure oxygen inlet 50 at the front of the low nitrogen burner, the flue gas temperature in the furnace can be effectively increased. During the combustion of low calorific value tail gas, due to the low calorific value, the flue gas temperature generated by the combustion may not be sufficient to meet specific requirements. By introducing pure oxygen, the heat release in the combustion process can be increased, the flue gas temperature can be increased, and the requirements can be met.

[0057] In some embodiments, the tail gas incineration device further includes a temperature detector, which (not shown in the figure) is arranged on the incinerator body 10 and is configured to detect the temperature in the furnace 11. It should be noted that by installing a temperature detector, the temperature changes in the furnace 11 can be monitored in real time. This is very important for controlling the combustion process, optimizing the combustion efficiency, and protecting the safe operation of the equipment. The temperature detector can provide temperature data so that the operator can understand the temperature distribution inside the furnace 11 and adjust and control it as needed. The data of the temperature detector can be used to monitor the temperature changes during the combustion process to ensure that the temperature in the furnace is within a safe range. If the temperature exceeds the set upper limit, the operator can take timely measures, such as adjusting the combustion parameters or adding cooling measures, to prevent the equipment from overheating or damage. In addition, the temperature detector can also be used to optimize the combustion process. By monitoring the temperature changes, the operator can understand the combustion efficiency and make adjustments as needed. For example, if the temperature is too low, it may mean that the combustion is incomplete, and the combustion effect can be improved by increasing the oxygen supply or adjusting the fuel supply.

[0058] Accordingly, a tail gas incineration method is also provided, including the tail gas incineration device as described in the above embodiment. Therefore, the method can have all the technical features and technical effects of the above tail gas incineration device, which will not be described in detail here. The method includes the following steps:

[0059] S100, the fuel gas, primary air, and primary exhaust gas are burned under oxygen in the burner 20 and the first region 111, the combustion temperature is reduced, and carbon monoxide is generated, which is transmitted to the second region 112;

[0060] S200, inside the second area 112, the mixed gas of the secondary air and the secondary exhaust undergoes an oxidation reaction to generate nitrogen oxides and carbon dioxide, and the generated nitrogen oxides undergo a reduction reaction with carbon monoxide in the inflow from the first area 111 to generate nitrogen, which is transmitted to the third area 113;

[0061] S300. Inside the third region 113, the mixed gas of the tertiary air and the tertiary exhaust undergoes an oxidation reaction to generate nitrogen oxides and carbon dioxide. The generated nitrogen oxides undergo a reduction reaction with the carbon monoxide in the incoming flow from the second region 112 to generate nitrogen.

[0062] It should be noted that the tail gas and the combustion-supporting air adopt a staged combustion strategy, dividing the space in the incinerator into three areas, the first area 111 (main combustion reduction area), the second area 112 (secondary premixed flow oxidation area and reduction area), and the third area 113 (tertiary premixed flow oxidation area and reduction burnout area). In the main combustion reduction area, the fuel gas is burned in a slightly oxygen-deficient environment (primary air is insufficient, and the air excess coefficient is 0.8-0.9), and a portion of the tail gas (primary tail gas) is sent to the burner 20. This slightly oxygen-deficient combustion environment can significantly reduce the combustion temperature and reduce the generation of thermal NOx. This area also generates some CO, so it is called the main combustion reduction area. In the secondary premixed flow oxidation area and reduction area, the secondary tail gas and the secondary air are premixed and sprayed into the incinerator. Under the action of oxygen, the nitrogen-containing substances in the secondary tail gas generate NOx, and then react with the CO in the reduction area to generate N2, thereby reducing the fuel-type NOx from the tail gas. At the same time, part of the CO is oxidized to CO2. The functions of these two stages are the secondary premixed flow oxidation zone and the reduction zone. In the tertiary premixed flow oxidation zone and the reduction burnout zone, the tertiary air and the tertiary exhaust gas form a premixed flow, which is sprayed from the second through hole 71 to the center of the furnace 11. First, the tertiary exhaust gas and the air are premixed, and the nitrogen-containing substances and the CO in the tertiary exhaust gas preferentially react with the oxygen in the premixed air to generate NOx and CO2. Then, this premixed airflow is fully mixed with the upstream main combustion reduction zone and the secondary premixed flow oxidation zone and the reduction zone. In this process, the probability of NOx reacting with CO from the main combustion reduction zone increases, and part of NOx is reduced to N2. Finally, all combustible substances react fully with the remaining air to significantly reduce CO. These two stages are called the tertiary premixed flow oxidation zone and the reduction burnout zone.

[0063] In some embodiments, the combustion temperature in the burner is W, which satisfies 800°C≤W≤1300°C. This range limits the upper and lower limits of the combustion temperature, ensuring that the combustion process is carried out within a controllable temperature range. It should be noted that by controlling the combustion temperature within a suitable range, full combustion of the fuel and efficient use of energy can be achieved. Too low a combustion temperature may lead to incomplete combustion and energy loss, while too high a combustion temperature may trigger the generation of a large amount of thermal NOx. Limiting the combustion temperature range helps control the generation of nitrogen oxides (NOx) and other harmful gases. Too high a combustion temperature may increase the generation of NOx, while too low a combustion temperature may lead to incomplete combustion and the generation of harmful gases. By ensuring that the combustion temperature is within an appropriate range, the negative impact on the environment can be minimized. The limitation of the combustion temperature helps to protect the safe operation of the burner and related equipment. Too high a combustion temperature may cause overheating and damage to the equipment, while too low a combustion temperature may cause unstable combustion and equipment failure. By controlling the combustion temperature within a suitable range, the normal operation and long-term stability of the equipment can be ensured. That is, by limiting the combustion temperature in the burner within a specific range, this embodiment can optimize the combustion efficiency, control environmental pollution, and protect the safety of the equipment. This limitation helps achieve a sustainable combustion process and improves the performance and reliability of the system.

[0064] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0065] The exhaust gas incineration device and the exhaust gas incineration method provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application; ordinary technicians in this field should understand that: they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A tail gas incineration device, characterized in that: include: An incinerator body (10), the incinerator body (10) having a furnace (11), wherein the furnace (11) is provided with a first area (111), a second area (112), and a third area (113) in sequence along its axial direction; the incinerator body (10) having a secondary inlet (12) and a tertiary inlet (13), the secondary inlet (12) being in communication with the second area (112) and being configured to receive a mixed gas of secondary air and secondary exhaust gas into the second area (112), the tertiary inlet (13) being in communication with the third area (113) and being configured to receive a mixed gas of tertiary air and tertiary exhaust gas into the third area (113); A burner (20) is arranged at one end of the incinerator body (10) and is connected to the first area (111). The burner (20) has a accommodating chamber (21) connected to the first area (111), and the burner (20) includes a primary air inlet (22) and a primary exhaust gas inlet (23). The primary air inlet (22) is connected to the accommodating chamber (21) and is configured to receive primary air, and the primary exhaust gas inlet (23) is connected to the accommodating chamber (21) and is configured to receive primary exhaust gas.

2. The tail gas incineration device according to claim 1, characterized in that: The tail gas incineration device further comprises a first distribution cavity (30), wherein the first distribution cavity (30) is arranged on the incinerator body (10) and is located in the second area (112); A first through hole (31) is circumferentially formed on one side of the first distribution cavity (30) facing the interior of the furnace (11), and a side of the first distribution cavity (30) away from the first through hole (31) is connected to the secondary inlet (12), so that a mixed gas of secondary air and secondary exhaust gas received by the secondary inlet (12) is sprayed into the second area (112) from the first through hole (31).

3. The tail gas incineration device according to claim 2, characterized in that: The tail gas incineration device further comprises a second distribution cavity (70), wherein the second distribution cavity (70) is arranged on the incinerator body (10) and is located in the third area (113); A second through hole (71) is circumferentially formed on one side of the second distribution chamber (70) facing the interior of the furnace (11), and a side of the second distribution chamber (70) away from the second through hole (71) is connected to the tertiary inlet (13), so that a mixed gas of tertiary air and tertiary exhaust gas connected to the tertiary inlet (13) can be sprayed into the third area (113) from the second through hole (71).

4. The tail gas incineration device according to claim 1, characterized in that: The tail gas incineration device further comprises a fan (40), and an air outlet of the fan (40) is respectively connected to the primary air inlet (22), the secondary inlet (12), and the tertiary inlet (13).

5. The tail gas incineration device according to claim 1, characterized in that: The amount of the primary tail gas introduced is 8% to 10% of the total tail gas, and the total tail gas is the sum of the primary tail gas, the secondary tail gas, and the tertiary tail gas.

6. The tail gas incineration device according to claim 1, characterized in that: The burner (20) further comprises a pure oxygen inlet (50), wherein the pure oxygen inlet (50) is in communication with the accommodating chamber (21) and is configured to receive pure oxygen.

7. The tail gas incineration device according to claim 6, characterized in that: The tail gas incineration device further comprises a plurality of butterfly valves (60), and the primary air inlet (22), the primary tail gas inlet (23), and the pure oxygen inlet (50) are all provided with the butterfly valves (60).

8. The tail gas incineration device according to claim 1, characterized in that: The tail gas incineration device further comprises a temperature detector, which is arranged on the incinerator body (10) and is configured to detect the temperature in the furnace (11).

9. A tail gas incineration method, characterized in that: The tail gas incineration device according to any one of claims 1 to 8 is included, and the tail gas incineration method comprises the following steps: S100, the fuel gas, the primary air, and the primary exhaust gas are burned with insufficient oxygen inside the burner (20) and the first zone (111), the combustion temperature is reduced, carbon monoxide is generated, and the carbon monoxide is transmitted to the second zone (112); S200, inside the second region (112), the mixed gas of the secondary air and the secondary exhaust gas undergoes an oxidation reaction to generate nitrogen oxides and carbon dioxide, and the generated nitrogen oxides undergo a reduction reaction with the carbon monoxide in the incoming flow from the first region (111) to generate nitrogen, which is then transmitted to the third region (113); S300. Inside the third region (113), the mixed gas of tertiary air and tertiary exhaust gas undergoes an oxidation reaction to generate nitrogen oxides and carbon dioxide, and the generated nitrogen oxides undergo a reduction reaction with carbon monoxide in the incoming flow from the second region (112) to generate nitrogen.

10. The tail gas incineration method according to claim 9, characterized in that: The combustion temperature in the burner (20) is W, which satisfies 800°C≤W≤1300°C.

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