An incineration apparatus and method for incinerating waste gas.

Abstract

This invention relates to an incineration device and method for incinerating flue gas, comprising a burner, an incineration chamber, a mixing chamber, and a tailings chamber connected in sequence. The burner and the incineration chamber provide the initial heat source. The mixing chamber stores and distributes the flue gas, and performs a staged mixing reaction and heating process with the initial heat source. The tailings chamber provides reaction space and time for the flue gas. The mixing chamber has a three-stage structure with progressively expanding dimensions. The first stage has primary and secondary tail gas nozzles, with primary and secondary supplementary combustion nozzles corresponding to the centers of the primary and secondary tail gas nozzles. The second stage has a tertiary tail gas nozzle on its expanding conical surface, and a fourth and fifth stage tail gas nozzle on its cylindrical surface. The third stage has a sixth stage tail gas nozzle on its expanding conical surface. A distributor is provided at the inlet of the mixing chamber, and a choke ring is provided at the outlet. This invention achieves the harmless treatment of ultra-large flow flue gas at a relatively low preheating temperature and with less co-burning fuel consumption.

Description

Technical Field

[0001] This invention belongs to the field of flue gas incineration technology, and relates to an incineration device and method for flue gas. Background Technology

[0002] With the country's increased efforts to control air pollution, the situation of industrial waste gas pollution has been fundamentally changed. Based on the requirements for the stability of waste gas treatment equipment, the reliability of treatment effect, the applicability to various types of waste gas, and the safety of the process, most local governments' VOCs treatment policy guidelines basically include three processes and their combinations: adsorption, absorption, and thermal decomposition (incineration).

[0003] Although solvent recovery and reuse can conserve natural resources and significantly reduce enterprise operating costs, various industrial regulations severely limit the application of solvent recovery processes. Related patents include: a maleic anhydride waste gas recovery device (Nanjing Zhongteng Chemical Co., Ltd.); and a simple-to-operate maleic anhydride waste gas recovery device (Dongying Kede Chemical Co., Ltd.).

[0004] After incineration pyrolysis became the mainstream technology for treating maleic anhydride waste gas, its equipment has seen significant development and improvement. Pyrolysis processes are generally divided into four types: direct combustion (TO), regenerative thermal oxidizer (RTO), catalytic combustion (CO), and regenerative catalytic combustion (RCO), differing only in the combination of different combustion and heat exchange methods. It can primarily be used to treat adsorbed concentrated gas, and can also be used to directly treat medium-to-high concentration waste gas with a concentration >3.5 g / m³. Patents in this category include: a maleic anhydride waste gas recovery device (Dongying Huaya Guolian Aviation Fuel Co., Ltd.); a method for treating maleic anhydride production waste gas (Huizhou Yuxin New Materials Co., Ltd.); and a tail gas recovery and utilization system for maleic anhydride production (Yunnan Dawei Hengyuan Chemical Co., Ltd.).

[0005] For large-volume industrial waste gas, the TO (Total Rotation) process is more advantageous in terms of technology, investment, and land use, especially given the company's availability of fuel for secondary production. Shanghai Sifang Boiler Group Engineering Complete Equipment Co., Ltd. has filed two utility model patents: "A Maleic Anhydride Waste Gas Incineration Process and Boiler System" and "A Maleic Anhydride Waste Gas Incineration Boiler System (Unauthorized)." While these patents describe the overall process flow and some process parameters, they do not provide details on the treatment process and related technologies for the maleic anhydride tail gas from the incinerator. Furthermore, the structural parameters are highly specific and do not achieve the expected results of reducing the waste gas preheating temperature and decreasing the consumption of accompanying fuel. Summary of the Invention

[0006] The technical problem solved by this invention is to overcome the shortcomings of the prior art and propose an incineration device and method for incinerating flue gas, thereby solving the problem of harmless treatment of flue gas from incinerators and achieving the purpose of reducing the preheating temperature of the flue gas and reducing the consumption of co-burning fuel.

[0007] The solution of the present invention is: an incineration device for incinerating exhaust gas, comprising a burner, an incineration chamber, a mixing chamber, and a tail combustion chamber connected in sequence;

[0008] The burner and combustion chamber provide the initial heat source; the mixing chamber completes the storage and distribution of the exhaust gas, as well as the stepwise mixing and heating process with the initial heat source; the tail combustion chamber is located after the mixing chamber, providing reaction space and time for the exhaust gas.

[0009] The main body of the mixing chamber is the mixing section shell, which adopts a three-section structure with progressive expansion. The first section has a cylindrical surface with a primary exhaust gas nozzle and a secondary exhaust gas nozzle. The primary exhaust gas nozzle has a primary combustion nozzle at its center, and the secondary exhaust gas nozzle has a secondary combustion nozzle at its center. The second section has an expanding conical surface with a tertiary exhaust gas nozzle, and the second section has a cylindrical surface with a quaternary exhaust gas nozzle and a quinary exhaust gas nozzle. The third section has an expanding conical surface with a sixth exhaust gas nozzle. A distributor is installed at the inlet of the first section of the mixing chamber. The flue gas flowing out of the combustion chamber enters the primary exhaust gas nozzle and the primary combustion nozzle through the distributor to achieve the heating reaction between the exhaust gas and the combustion gas. A choke ring is installed at the outlet of the third section of the mixing chamber.

[0010] Furthermore, the mixing chamber also includes an exhaust gas casing;

[0011] The exhaust gas casing is welded to the outside of the mixing section casing to form an exhaust gas storage chamber, which is used to store the exhaust gas ejected from the exhaust gas nozzles of stages one to six.

[0012] Furthermore, the expansion cone angle of the second stage of the mixing chamber is 50° to 70°, and the expansion cone angle of the third stage of the mixing chamber is 90° to 120°;

[0013] Let the diameter of the first section of the mixing chamber be D1 and its length be L1, the diameter of the second section be D2 and its length be L2, and the diameter of the third section be D3 and its length be L3. Then the average flue gas velocity in the regions corresponding to D1, D2, and D3 is 15–20 m / s, the residence time of the flue gas in the regions corresponding to L1, L2, and L3 is 1.2 times the theoretical chemical kinetic reaction time of the tail gas, and the diameter of the flue gas ring, D4, is 0.8–0.9 times the diameter of the third section of the mixing chamber, D3.

[0014] Furthermore, the distributor is provided with a flame stabilizing boss and multiple distribution holes, one of which is located at the center of the distributor and coincides with the axis of the flame stabilizing boss; the remaining distribution holes are evenly distributed around the flame stabilizing boss and are spaced apart from the first-stage afterburning spray gun; the outer diameter D0 of the flame stabilizing boss is not greater than 0.5 times the diameter D1 of the first section of the mixing chamber, and the length L0 of the flame stabilizing boss is not greater than 0.5 times the length L1 of the first section of the mixing chamber.

[0015] Furthermore, the center of the plane where the first-stage exhaust nozzle is located is defined as the first imaginary tangent circle, and the diameter of the first imaginary tangent circle is not greater than the outer diameter D0 of the flame stabilizing boss; the first-stage exhaust nozzle is arranged tangentially along the first imaginary tangent circle and is evenly distributed according to the rotation direction of the first imaginary tangent circle.

[0016] The secondary exhaust nozzle is set in the plane between the primary and tertiary exhaust nozzles. The position, number, rotation direction, and nozzle diameter of the secondary exhaust nozzles in this plane are the same as those of the primary exhaust nozzles.

[0017] Furthermore, the center of the plane where the fourth-stage exhaust nozzle is located is defined as the third imaginary tangent circle, and the diameter of the third imaginary tangent circle is 1 / 3 of the diameter D of the second section of the mixing chamber; the fourth-stage exhaust nozzle is tangentially distributed along the third imaginary tangent circle, producing a jet with the same rotation direction as the first-stage exhaust nozzle and the second-stage exhaust nozzle.

[0018] Furthermore, the third-stage exhaust nozzles are evenly distributed centripetally along their circumference and are adjacent to the fourth-stage exhaust nozzles, generating a centripetal jet.

[0019] The three-stage and four-stage exhaust nozzles are arranged alternately, with both having the same nozzle diameter and the same number.

[0020] Furthermore, the distance between the fifth-stage exhaust nozzle and the fourth-stage exhaust nozzle is 1 / 2 to 2 / 3 of the length L2 of the second section of the mixing chamber.

[0021] The center of the plane containing the five-stage exhaust nozzle is defined as the fourth imaginary tangent circle, and the diameter of the fourth imaginary tangent circle is 1 / 7 of the diameter D2 of the second section of the mixing chamber. The five-stage exhaust nozzle is tangentially distributed along the fourth imaginary tangent circle, producing a jet with the same rotation direction as the four-stage exhaust nozzle.

[0022] Furthermore, the center of the plane containing the sixth-stage exhaust nozzle is defined as the fifth imaginary tangent circle, and the diameter of the fifth imaginary tangent circle is 1 / 3 of the diameter D3 of the third section of the mixing chamber; the sixth-stage exhaust nozzle is centripetal and tangentially distributed along the fifth imaginary tangent circle, producing a jet with the same rotation direction as the fifth-stage exhaust nozzle.

[0023] Furthermore, a method for incinerating flue gas is provided, the process of which is as follows:

[0024] Two-stage fuel input is adopted: the first stage is the burner and combustion chamber, which provides the initial heat source by burning fuel or waste gas and waste liquid; the second stage is the first-stage and second-stage afterburning nozzles, which use the waste gas as an auxiliary agent to provide the remaining heat required for the combustion process.

[0025] The mixing chamber, through the exhaust gas storage chamber and the first to sixth stage exhaust gas nozzles, divides the exhaust gas into four streams: the first and second stage exhaust gas nozzle streams account for 10-20% of the total; the third and fourth stage exhaust gas nozzle streams account for 10-20% of the total; the fifth stage exhaust gas nozzle stream accounts for 20%-30%; and the sixth stage exhaust gas nozzle stream accounts for 40%-50%.

[0026] During the staged ignition process, the initial heat source temperature is between 1100 and 1300℃; the theoretical temperature of the flue gas after mixing with the jets from the first-stage exhaust gas nozzle, the second-stage exhaust gas nozzle, the first-stage afterburning nozzle, and the second-stage afterburning nozzle is between 1300 and 1500℃; the theoretical temperature of the flue gas after mixing with the jets from the third-stage and fourth-stage exhaust gas nozzles is between 1000 and 1100℃; the theoretical temperature of the flue gas after mixing with the jets from the fifth-stage exhaust gas nozzle is between 900 and 1000℃; and the theoretical temperature of the flue gas after mixing with the jets from the sixth-stage exhaust gas nozzle is between 780 and 880℃.

[0027] The tail combustion chamber provides a preset residence time for the process flue gas to ensure that emissions meet standards.

[0028] The advantages of this invention compared to the prior art are:

[0029] (1) This invention achieves the goal of using a relatively small initial heat source to ignite ultra-large flow rate exhaust gas while meeting emission standards. The burner provides an initial stable heat source, which can be fueled by natural gas, oil, or other high-calorific-value exhaust gases or liquids. The incineration chamber is designed to meet environmental regulations and related requirements, with a flue gas temperature >1100℃ and a residence time >2s. If no such requirements exist, the design can be simplified. The mixing chamber stores and distributes the exhaust gas, and facilitates the staged mixing and heating process with the initial heat source. The tail combustion chamber provides sufficient reaction space and time for the exhaust gas. This invention achieves the goal of using a relatively small initial heat source to ignite ultra-large flow rate exhaust gas in stages while meeting emission standards.

[0030] (2) This invention features an innovative design for the size and structure of the mixing chamber. The combustion gas gun in the mixing chamber utilizes the flue gas as a combustion aid to provide the remaining heat required for the combustion process. The mixing chamber, through the exhaust gas register and the first to sixth stage exhaust gas nozzles, divides the flue gas into multiple streams, which are then ignited one by one by the initial heat source. The structural dimensions of the mixing chamber in this invention ensure the time and space required for each mixing and reaction of the flue gas; it enables the harmless treatment of ultra-large flow flue gas at a lower preheating temperature and with less co-burning fuel consumption. Attached Figure Description

[0031] Figure 1 This is an overall assembly diagram of the incineration device described in an embodiment of the present invention;

[0032] Figure 2 This is a structural diagram of the mixing chamber according to an embodiment of the present invention;

[0033] Figure 3a This is a cross-sectional view of the distributor according to an embodiment of the present invention;

[0034] Figure 3b This is a top view of the distributor according to an embodiment of the present invention;

[0035] Figure 4 This is a diagram showing the distribution of exhaust nozzles from stage one to stage six in an embodiment of the present invention.

[0036] The components include: 1. Burner; 2. Combustion chamber; 3. Mixing chamber; 4. Tail combustion chamber.

[0037] 31 Distributor, 32 First-stage afterburning nozzle, 33 Second-stage afterburning nozzle, 34 Mixing section housing, 35 Exhaust gas housing, 36 Exhaust gas storage chamber, 37 Lining, 38 Exhaust gas nozzle, 39 Flame ring, 381 First-stage exhaust gas nozzle, 382 Second-stage exhaust gas nozzle, 383 Third-stage exhaust gas nozzle, 384 Fourth-stage exhaust gas nozzle, 385 Fifth-stage exhaust gas nozzle, 386 Sixth-stage exhaust gas nozzle;

[0038] 311 Distribution holes, 312 Flame stabilizing boss. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] Example 1

[0041] like Figure 1 As shown, the basic structure of the incineration device of the present invention includes four parts: burner 1, incineration chamber 2, mixing chamber 3, and tail combustion chamber 4, which are connected in sequence.

[0042] Burner 1 provides an initial stable heat source and can use natural gas, oil, or other high-calorific-value waste gas or liquid as co-burning fuel.

[0043] Incineration chamber 2 is designed to meet environmental protection standards and related requirements, with flue gas temperature >1100℃ and residence time >2s. If there are no such requirements, it can be simplified.

[0044] Mixing chamber 3 completes the storage and distribution of the exhaust gas, as well as the stepwise mixing and heating process with the initial heat source.

[0045] The tail combustion chamber 4 is located after the mixing chamber 3, providing ample space and time for the exhaust gas to react.

[0046] like Figure 2As shown, the main structure of the mixing chamber 3 includes: distributor 31, primary combustion nozzle 32, secondary combustion nozzle 33, mixing section shell 34, exhaust gas shell 35, exhaust gas storage chamber 36, lining 37, exhaust gas nozzle 38, and exhaust ring 39.

[0047] The mixing section shell 34 is the main body of the mixing chamber 3. The exhaust gas shell 35 is welded to the front end of the mixing section shell 34 to form the exhaust gas storage chamber 36, which is used to store the exhaust gas ejected from the first- to sixth-stage exhaust gas nozzles 381 to 386. The first- to sixth-stage exhaust gas nozzles 381 to 386 are welded to the mixing section shell 34 and embedded in the lining 37.

[0048] The main body of mixing chamber 3 has a progressively expanding structure, divided into three sections: The first section has a diameter of D1 and a length of L1, and is equipped with a first-stage exhaust nozzle 381 and a second-stage exhaust nozzle 382. The second section has an expansion cone angle of 60°, a diameter of D2, and a length of L2; the expansion cone of the second section is equipped with a third-stage exhaust nozzle 383, and the cylindrical surface of the second section is equipped with a fourth-stage exhaust nozzle 384 and a fifth-stage exhaust nozzle 385. The third section has an expansion cone angle of 90°, a diameter of D3, and a length of L3; the expansion cone of the third section is equipped with a sixth-stage exhaust nozzle 386. A choke ring 39 is installed at the outlet of mixing chamber 3, and the diameter D4 of the choke ring 39 is 0.85 times the diameter D3 of the third section of mixing chamber 3.

[0049] The distributor 31 is located at the first inlet of the mixing chamber 3. The flue gas flowing from the combustion chamber 2 enters the primary exhaust gas nozzle 381 and the primary afterburning nozzle 32 through the distributor 31. The distributor 31 works in conjunction with the primary exhaust gas nozzle 381 and the primary afterburning nozzle 32 to achieve a rapid heating reaction between the exhaust gas and the combustion gas. Figure 3a , Figure 3b As shown, the distributor 31 has a flame-stabilizing boss 312 and multiple distribution holes 311. One distribution hole 311 is located at the center of the distributor 31 and coincides with the axis of the flame-stabilizing boss 312. The remaining distribution holes 311 are evenly distributed around the flame-stabilizing boss 312 and are spaced apart from the primary combustion nozzle 32. In this embodiment, the outer diameter D0 of the flame-stabilizing boss is 0.5 times the diameter D1 of the first section of the mixing chamber 3, and the length L0 of the flame-stabilizing boss is 0.5 times the length L1 of the first section of the mixing chamber 3. If the incineration device has no incineration chamber, the distributor 31 can be removed.

[0050] The first-stage afterburning nozzle 32 is placed at the center of the first-stage exhaust gas nozzle 381, and the number of nozzles is the same as that of the first-stage exhaust gas nozzle 381; the second-stage exhaust gas nozzle 382 is placed at the center of the second-stage exhaust gas nozzle 382, ​​and the number of nozzles is the same as that of the second-stage exhaust gas nozzle 382.

[0051] like Figure 4As shown, the center of the plane where the first-stage exhaust nozzle 381 is located is defined as the first imaginary tangent circle, and the diameter of the first imaginary tangent circle is slightly smaller than the outer diameter D0 of the flame stabilizing boss; the first-stage exhaust nozzle 381 is arranged tangentially along the first imaginary tangent circle and is evenly distributed according to the rotation direction of the first imaginary tangent circle.

[0052] The secondary exhaust nozzle 382 is set in the plane between the primary exhaust nozzle 381 and the tertiary exhaust nozzle 383. The setting position, number, rotation direction and nozzle diameter of the secondary exhaust nozzle 382 in this plane are the same as those of the primary exhaust nozzle 381.

[0053] The third-stage exhaust nozzle 383 is located on the second expansion cone surface of the mixing chamber 3, and is evenly distributed centripetally along its circumference, adjacent to the fourth-stage exhaust nozzle 384; the third-stage exhaust nozzle 383 generates a centripetal jet.

[0054] The center of the plane containing the fourth-stage exhaust nozzle 384 is defined as the third imaginary tangent circle, and the diameter of the third imaginary tangent circle is approximately 1 / 3 of the diameter D2 of the second section of the mixing chamber 3. The fourth-stage exhaust nozzle 384 is tangentially distributed along the third imaginary tangent circle, producing a jet with the same rotation direction as the first-stage exhaust nozzle 381 and the second-stage exhaust nozzle 382.

[0055] The three-stage exhaust nozzle 383 and the four-stage exhaust nozzle 384 are arranged alternately, with the same nozzle diameter and the same number of nozzles.

[0056] The fifth-stage exhaust nozzle 385 is at a certain distance from the fourth-stage exhaust nozzle 384, which is approximately 2 / 3 of the length L2 of the mixing chamber 3. The center of the plane containing the fifth-stage exhaust nozzle 384 is defined as the fourth imaginary tangent circle, and the diameter of the fourth imaginary tangent circle is approximately 1 / 7 of the diameter D2 of the second segment of the mixing chamber 3. The fifth-stage exhaust nozzle 384 is tangentially and uniformly distributed along the fourth imaginary tangent circle, producing a jet with the same rotation direction as the fourth-stage exhaust nozzle 384.

[0057] The sixth-stage exhaust nozzle 386 is set on the expansion cone surface of the third section of the mixing chamber 3. The center of the plane where the sixth-stage exhaust nozzle 386 is located is defined as the fifth imaginary tangent circle. The diameter of the fifth imaginary tangent circle is about 1 / 3 of the diameter D3 of the third section of the mixing chamber 3. The sixth-stage exhaust nozzle 386 is centripetal and uniformly distributed along the tangential direction of the fifth imaginary tangent circle, generating a jet with the same rotation direction as the fifth-stage exhaust nozzle 385.

[0058] The incineration method involved in this invention is based on the principle of rationally distributing and arranging the exhaust gas to achieve the goal of using a relatively small initial heat source to ignite a large flow of exhaust gas in stages and achieve emission standards.

[0059] A method for incinerating ultra-high flow rate flue gas based on the aforementioned incineration device is as follows:

[0060] Two-stage fuel input is adopted: the first stage is the burner 1 and the combustion chamber 2, which provide the initial heat source by burning fuel or high-calorific-value waste gas and waste liquid; the second stage is the first-stage supplementary combustion nozzle 32 and the second-stage supplementary combustion nozzle 33, which use the waste gas as a combustion aid to provide the remaining heat required for the combustion process.

[0061] The heat load distribution between burner 1 and the primary and secondary supplementary combustion nozzles 32 and 33 depends on the function of the incineration chamber 2: when the incineration chamber 2 is used for the combustion of waste gas and waste liquid, the remaining heat load required after meeting emission standards (such as GB 18484) or other design requirements is borne by the primary and secondary supplementary combustion nozzles 32 and 33. When the incineration chamber 2 is only used as the initial heat source, the primary and secondary supplementary combustion nozzles 32 and 33 may not be used, or the design of the primary exhaust gas nozzle 381, secondary exhaust gas nozzle 382, ​​and distributor 31 may be omitted.

[0062] The mixing chamber 3, through the exhaust gas storage chamber 36 and the first to sixth stage exhaust gas nozzles 381-386, divides the exhaust gas into four streams: the first stage exhaust gas nozzle 381 and the second stage exhaust gas nozzle 382 streams account for 10-20% of the total; the third stage exhaust gas nozzle 383 and the fourth stage exhaust gas nozzle 384 streams account for 10-20% of the total; the fifth stage exhaust gas nozzle 385 stream accounts for 20%-30% of the total; and the sixth stage exhaust gas nozzle 386 stream accounts for 40%-50% of the total.

[0063] During the staged ignition process, the initial heat source temperature is between 1100 and 1300℃; the theoretical temperature of the flue gas after mixing with the jets from the first-stage exhaust gas nozzle 381, the second-stage exhaust gas nozzle 382, ​​the first-stage afterburning nozzle 32, and the second-stage afterburning nozzle 33 is between 1300 and 1500℃; the theoretical temperature of the flue gas after mixing with the jets from the third-stage exhaust gas nozzle 383 and the fourth-stage exhaust gas nozzle 384 is between 1000 and 1100℃; the theoretical temperature of the flue gas after mixing with the jet from the fifth-stage exhaust gas nozzle 385 is between 900 and 1000℃; and the theoretical temperature of the flue gas after mixing with the jet from the sixth-stage exhaust gas nozzle 385 is between 780 and 880℃.

[0064] The structural dimensions of mixing chamber 3 ensure the time and space required for each mixing and reaction of flue gas: the average flue gas velocity in the areas corresponding to dimensions D1, D2, and D3 is 15-20 m / s, and the flue gas residence time in the areas corresponding to lengths L1, L2, and L3 is approximately 1.2 times the theoretical chemical kinetic reaction time of the tail gas.

[0065] The tail combustion chamber 4 provides a residence time of 1.2 seconds for the process flue gas, ensuring that emissions meet standards.

[0066] This invention enables the harmless treatment of ultra-large flow rate flue gas at a lower preheating temperature and with less co-burning fuel consumption.

[0067] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A combustion device for incinerating exhaust gas, characterized in that, It includes a burner (1), an incineration chamber (2), a mixing chamber (3), and a tail combustion chamber (4) connected in sequence. The burner (1) and the combustion chamber (2) provide the initial heat source; the mixing chamber (3) completes the storage and distribution of the exhaust gas, as well as the stepwise mixing reaction and heating process with the initial heat source; the tail combustion chamber (4) is located after the mixing chamber (3) and provides reaction space and time for the exhaust gas. The main body of the mixing chamber (3) is the mixing section shell (34), which adopts a three-section structure with progressive expansion. The three sections are connected in sequence. The first section is a cylindrical space. The side of the cylinder is provided with a first-stage exhaust gas nozzle (381) and a second-stage exhaust gas nozzle (382). The center of the first-stage exhaust gas nozzle (381) is provided with a first-stage afterburning nozzle (32), and the center of the second-stage exhaust gas nozzle (382) is provided with a second-stage afterburning nozzle (33). The second section is a space combining a frustum and a cylinder. The conical surface of the frustum is provided with a third-stage exhaust gas nozzle. The nozzle (383) has a four-stage exhaust gas nozzle (384) and a five-stage exhaust gas nozzle (385) on the side of the cylinder; the third section is the space where the frustum and the cylinder are combined, and the cone surface of the frustum is equipped with a six-stage exhaust gas nozzle (386); the first section of the mixing chamber (3) has a distributor (31) at the inlet, and the flue gas flowing out of the combustion chamber (2) enters the first section of the mixing chamber (3) through the distributor (31) to realize the heating reaction between the exhaust gas and the combustion gas; the third section of the mixing chamber (3) has a choke ring (39) at the outlet.

2. The incineration device for flue gas according to claim 1, characterized in that, The mixing chamber (3) also includes an exhaust gas casing (35); The exhaust gas housing (35) is welded to the outside of the mixing section housing (34) to form an exhaust gas storage chamber (36) for storing the exhaust gas ejected from the first to sixth stage exhaust gas nozzles (381~386).

3. The incineration device for flue gas according to claim 1, characterized in that, The apex angle of the second frustum space in the mixing chamber (3) is 50°~70°, and the apex angle of the third frustum space in the mixing chamber (3) is 90°~120°; Let the diameter of the first cylindrical space of the mixing chamber (3) be D1 and the length be L1, the diameter of the second cylindrical space of the mixing chamber (3) be D2 and the length be L2, and the diameter of the third cylindrical space of the mixing chamber (3) be D3 and the length be L3. Then the average flow velocity of the flue gas in the regions corresponding to D1, D2 and D3 is 15~20m / s, the residence time of the flue gas in the regions corresponding to L1, L2 and L3 is 1.2 times the theoretical chemical dynamic reaction time of the tail gas, and the diameter D4 of the choke ring (39) is 0.8~0.9 times the diameter D3 of the third cylindrical space of the mixing chamber (3).

4. The incineration device for flue gas according to claim 3, characterized in that, The distributor (31) is provided with a flame stabilizing boss (312) and multiple distribution holes (311). One of the distribution holes (311) is located at the center of the distributor (31) and coincides with the axis of the flame stabilizing boss (312). The remaining distribution holes (311) are evenly distributed around the flame stabilizing boss (312) and are spaced apart from the first-stage afterburning spray gun (32). The outer diameter D0 of the flame stabilizing boss is not greater than 0.5 times the diameter D1 of the first cylindrical space of the mixing chamber (3), and the length L0 of the flame stabilizing boss is not greater than 0.5 times the length L1 of the first cylindrical space of the mixing chamber (3).

5. The incineration device for flue gas according to claim 4, characterized in that, The center of the plane where the first-stage exhaust nozzle (381) is located is defined as the first imaginary tangent circle. The diameter of the first imaginary tangent circle is not greater than the outer diameter D0 of the flame stabilizer boss. The first-stage exhaust nozzle (381) is arranged tangentially along the first imaginary tangent circle and is evenly opened according to the rotation direction of the first imaginary tangent circle. The secondary exhaust nozzle (382) is set in the plane between the primary exhaust nozzle (381) and the tertiary exhaust nozzle (383). The secondary exhaust nozzle (382) is set in the same plane in terms of position, number, rotation direction and nozzle diameter as the primary exhaust nozzle (381).

6. The incineration device for flue gas according to claim 5, characterized in that, The center of the plane where the fourth-stage exhaust nozzle (384) is located is defined as the third imaginary tangent circle, and the diameter of the third imaginary tangent circle is 1 / 3 of the diameter D2 of the second cylindrical space of the mixing chamber (3). The fourth-stage exhaust nozzle (384) is tangentially distributed along the third imaginary tangent circle, generating a jet with the same rotation direction as the first-stage exhaust nozzle (381) and the second-stage exhaust nozzle (382).

7. The incineration device for flue gas according to claim 6, characterized in that, The third-stage exhaust nozzle (383) is evenly distributed centripetally along its circumference and is adjacent to the fourth-stage exhaust nozzle (384), generating a centripetal jet. The three-stage exhaust nozzle (383) and the four-stage exhaust nozzle (384) are arranged alternately, and the nozzle diameter and number of both are the same.

8. The incineration device for flue gas according to claim 6, characterized in that, The distance between the fifth-stage exhaust nozzle (385) and the fourth-stage exhaust nozzle (384) is 1 / 2 to 2 / 3 of the length L2 of the second cylindrical space of the mixing chamber (3); The center of the plane where the fifth-stage exhaust nozzle (385) is located is defined as the fourth imaginary tangent circle. The diameter of the fourth imaginary tangent circle is 1 / 7 of the diameter D2 of the second cylindrical space of the mixing chamber (3). The fifth-stage exhaust nozzle (385) is tangentially distributed along the fourth imaginary tangent circle, producing a jet with the same rotation direction as the fourth-stage exhaust nozzle (384).

9. The incineration device for flue gas according to claim 8, characterized in that, The center of the plane where the sixth-stage exhaust nozzle (386) is located is defined as the fifth imaginary tangent circle, and the diameter of the fifth imaginary tangent circle is 1 / 3 of the diameter D3 of the third cylindrical space of the mixing chamber (3). The sixth-stage exhaust nozzle (386) is centripetal and tangentially distributed along the fifth imaginary tangent circle, producing a jet with the same rotation direction as the fifth-stage exhaust nozzle (385).

10. A method for incinerating flue gas based on the apparatus of claim 9, characterized in that, The process is as follows: Two-stage fuel input is adopted: the first stage is the burner (1) and the combustion chamber (2) to provide the initial heat source by burning fuel or waste gas and waste liquid; the second stage is the first-stage supplementary combustion nozzle (32) and the second-stage supplementary combustion nozzle (33) to use the waste gas as a combustion aid to provide the remaining heat required for the combustion process. The mixing chamber (3) divides the exhaust gas into four streams through the exhaust gas storage chamber (36) and the first to sixth stage exhaust gas nozzles (381~386): the first stage exhaust gas nozzle (381) and the second stage exhaust gas nozzle (382) together account for 10~20% of the total flow; the third stage exhaust gas nozzle (383) and the fourth stage exhaust gas nozzle (384) together account for 10~20% of the total flow; the fifth stage exhaust gas nozzle (385) accounts for 20%~30% of the flow; and the sixth stage exhaust gas nozzle (386) accounts for 40%~50% of the flow. During the staged ignition process, the initial heat source temperature is between 1100 and 1300℃; the theoretical temperature of the flue gas after mixing with the jets from the first-stage exhaust gas nozzle (381), the second-stage exhaust gas nozzle (382), the first-stage afterburning nozzle (32), and the second-stage afterburning nozzle (33) is between 1300 and 1500℃; the theoretical temperature of the flue gas after mixing with the jets from the third-stage exhaust gas nozzle (383) and the fourth-stage exhaust gas nozzle (384) is between 1000 and 1100℃; the theoretical temperature of the flue gas after mixing with the jet from the fifth-stage exhaust gas nozzle (385) is between 900 and 1000℃; and the theoretical temperature of the flue gas after mixing with the jet from the sixth-stage exhaust gas nozzle (386) is between 780 and 880℃. The tail combustion chamber (4) provides a preset residence time for the process flue gas to ensure that emissions meet standards.

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