A low nitrogen tail gas incinerator

Abstract

The present invention provides a low-nitrogen exhaust gas incinerator, which includes a furnace body and a burner connected to the furnace body, and a furnace is provided inside the furnace body; the burner includes a fire channel and a primary air duct and a first-level exhaust gas duct connected to the fire channel, which are used to transport primary air and first-level exhaust gas into the fire channel; the furnace body is provided with a secondary air duct and a second-level exhaust gas duct, and the secondary air duct runs through the furnace body and is directly connected to the furnace, and is used to introduce secondary air into the furnace; the second-level exhaust gas duct runs through the furnace body and is directly connected to the furnace, and is used to introduce secondary exhaust gas into the furnace; the low-nitrogen exhaust gas incinerator described in the present invention is beneficial to controlling the temperature distribution in the furnace, reducing the high-temperature zone, and minimizing the generation of nitrogen oxides, on the one hand, and is beneficial to reducing the number of openings on the burner, simplifying the structure of the burner, and can minimize the length, diameter and other structural dimensions of the burner while ensuring mechanical properties.

Description

Technical Field

[0001] The invention relates to the technical field of sulfur recovery, in particular to a low-nitrogen tail gas incinerator in a sulfur recovery device. Background Art

[0002] Sulfur recovery technology is used in refineries, chemical plants, natural gas purification plants, and coal chemical industries. During the sulfur recovery process, a large amount of tail gas is generated. This tail gas is primarily nitrogen, but also contains small amounts of combustible components such as hydrogen sulfide, hydrogen, sulfur, and hydrocarbons. Directly discharging this tail gas into the atmosphere would pollute the environment due to the highly toxic hydrogen sulfide, while also wasting energy by discharging the combustible components.

[0003] The current widely adopted measure in the industry is to incinerate the tail gas, burn the toxic hydrogen sulfide gas, and recover the heat generated by the combustible components through the waste heat boiler to generate steam. It seems to be a perfect tail gas treatment technology, but in the process of tail gas incineration, new pollutants will be generated - nitrogen oxides (NO X In order to produce as little nitrogen oxides as possible during the exhaust gas incineration process and protect the environment, it is necessary to invent a low-nitrogen exhaust gas incinerator.

[0004] In the existing technology, there are also some low-nitrogen tail gas incinerator technologies, which generally use graded air distribution and oxygen-deficient combustion technology to control the generation of nitrogen oxides. The effect is not ideal, the temperature inside the furnace body is difficult to control, and the lining is easily damaged. For example: Patent CN210267242U discloses a sulfur-containing tail gas graded incinerator that can reduce nitrogen oxides, including a furnace body and a burner connected to the front end of the furnace body, the burner includes a combustion channel, a fuel gas channel for introducing fuel gas into the combustion channel, and a primary air channel for introducing combustion-supporting air into the combustion channel. The sulfur-containing tail gas enters the incinerator in two levels, wherein the first-level sulfur-containing tail gas is directly sprayed into the combustion channel; the patent discloses that a two-stage air inlet structure and a two-stage tail gas inlet structure are set on the burner, which to a certain extent reduces the average temperature in the fire channel, reduces the high-temperature zone, and reduces the generation of nitrogen oxides; but in this patent, the two-stage air inlet structure and the two-stage tail gas inlet structure are both set on the burner, which makes the structure of the burner too complicated. On the one hand, the primary air channel and the two-stage air inlet structure are too complicated. The secondary air channel, the first-level sulfur-containing exhaust gas channel and the second-level sulfur-containing exhaust gas channel are all arranged on the burner, so that too many structures are set on the burner with limited length itself, which is not conducive to reducing the structural size of the burner; on the other hand, in order to allow the air and exhaust gas in the secondary air channel, the first-level sulfur-containing exhaust gas channel and the second-level sulfur-containing exhaust gas channel to flow into the furnace body for combustion, it is necessary to set multiple layers of interlayer space in the furnace wall of the burner to serve as the circulation channel for air and exhaust gas, so that the furnace wall of the burner needs to be set to a thicker thickness, which is not conducive to processing and manufacturing, and consumes more materials. In terms of sealing and insulation, excessive insulation materials need to be consumed, and the insulation effect is not ideal; at the same time, it is difficult for this patent to control the temperature in the furnace of the incinerator, and it is difficult to ensure that the generation of nitrogen oxides is minimized to the greatest extent. Summary of the Invention

[0005] In view of this, the present invention aims to propose a low-nitrogen tail gas incinerator to solve the problems of the low-nitrogen tail gas incinerator in the prior art, such as the burner structure is too complicated and it is difficult to control the temperature in the incinerator furnace.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A low-nitrogen exhaust gas incinerator, which includes a furnace body and a burner connected to the furnace body, and a furnace is provided inside the furnace body; the burner includes a fire channel and a primary air duct and a first-level exhaust gas duct connected to the fire channel, which are used to transport primary air and first-level exhaust gas into the fire channel; the furnace body is provided with a secondary air duct and a second-level exhaust gas duct, the secondary air duct runs through the furnace body and is directly connected to the furnace, and is used to introduce secondary air into the furnace; the second-level exhaust gas duct runs through the furnace body and is directly connected to the furnace, and is used to introduce secondary exhaust gas into the furnace.

[0008] Furthermore, the incinerator includes a total exhaust gas inlet, which is connected to the inlet of the secondary exhaust gas pipeline through a secondary exhaust gas flow regulating valve. A first-level exhaust gas pipeline is arranged at the feed port of the second-level exhaust gas flow regulating valve. The inlet of the first-level exhaust gas pipeline is connected to the total exhaust gas inlet, and the outlet of the first-level exhaust gas pipeline is connected to the inlet of the first-level exhaust gas pipeline. The first-level exhaust gas pipeline is provided with a first-level exhaust gas flow regulating valve.

[0009] Furthermore, the inlet of the primary air duct is a primary air inlet, the outlet of the primary air duct is a primary air throat, and the first-level exhaust gas duct is sleeved on the outside of the primary air throat.

[0010] Furthermore, the first-level exhaust gas pipeline includes a first-level exhaust gas inlet and a first-level exhaust gas throat which are connected in sequence, and the first-level exhaust gas throat is sleeved on the outside of the primary air throat.

[0011] Furthermore, the first-stage exhaust throat and the primary air throat are arranged concentrically.

[0012] Furthermore, a first-level exhaust gas collecting chamber is provided in the first-level exhaust gas pipeline, the inlet of the first-level exhaust gas collecting chamber is connected to the first-level exhaust inlet, and the outlet of the first-level exhaust gas collecting chamber is connected to the first-level exhaust throat.

[0013] Furthermore, the first-level exhaust gas pipeline includes a first-level exhaust gas inlet and a first-level exhaust gas nozzle which are connected in sequence, and the first-level exhaust gas nozzle is arranged outside the primary air throat and is arranged around the primary air throat; a first-level exhaust gas collecting chamber is arranged in the first-level exhaust gas pipeline, and the inlet of the first-level exhaust gas collecting chamber is connected to the first-level exhaust inlet, and the outlet of the first-level exhaust gas collecting chamber is connected to the first-level exhaust gas nozzle.

[0014] Furthermore, the first-stage exhaust nozzle includes multiple tube bodies, which are arranged in a circular array around the outside of the primary air throat. One end of the tube body is connected to the first-stage exhaust gas collecting chamber, and the other end of the tube body is connected to the fire channel.

[0015] Furthermore, the first-level exhaust nozzle includes a first cylinder and a second cylinder, the outer diameter of the first cylinder is smaller than the inner diameter of the second cylinder, the second cylinder is arranged on the outside of the first cylinder, and a first-level exhaust channel is formed between the first cylinder and the second cylinder; one end of the first-level exhaust channel is connected to the first-level exhaust gas collecting chamber, and the other end of the first-level exhaust channel is connected to the fire channel.

[0016] Furthermore, the secondary exhaust gas pipeline passes through the furnace wall of the furnace body through the secondary exhaust gas nozzle, and the secondary exhaust gas nozzle passes through the furnace wall of the furnace body along an inclined direction;

[0017] The secondary air duct passes through the furnace wall of the furnace body through the secondary air nozzle, and the secondary air nozzle passes through the furnace wall of the furnace body along an inclined direction.

[0018] Compared with the existing technology, the low-nitrogen tail gas incinerator described in the present invention has the following advantages:

[0019] The low-nitrogen exhaust gas incinerator described in the present invention, compared with the prior art, simultaneously modifies the burner and the furnace body; a primary air inlet and a first-level exhaust gas inlet are set on the burner, and the first-level exhaust gas is introduced into the fire channel. On the one hand, the exhaust gas can be used to dilute the oxygen concentration in the air, and the oxygen-depleted combustion technology is used to reduce the generation of nitrogen oxides. On the other hand, the first-level exhaust gas enters the fire channel along the inner wall of the fire channel, which can protect the lining of the fire channel from being burned by the high-temperature flame, which is beneficial to improving the fire resistance of the lining of the fire channel. At the same time, as the fire resistance of the lining of the fire channel is improved, the furnace wall of the burner at the fire channel does not need to be additionally thickened, which is beneficial to simplifying the structure of the burner and saving the production raw materials of the burner. Or, on this basis, the fire resistance level of the refractory lining can also be reduced, which is beneficial to reducing equipment cost investment.

[0020] At the same time, the furnace body of this embodiment is provided with a secondary air duct and a secondary exhaust gas duct. On the one hand, by controlling the air intake of the secondary air and the secondary exhaust gas, the temperature inside the furnace is controlled, which is beneficial to controlling the temperature distribution in the furnace, reducing the high-temperature zone, and minimizing the generation of nitrogen oxides. On the other hand, since the diameter, length and other dimensional data of the furnace body itself are relatively large, there is no need to change the shape and structure of the furnace body. It is only necessary to set a secondary air duct and a secondary exhaust gas duct on the furnace body. At the same time, the secondary air and the secondary exhaust gas are directly introduced into the furnace through the furnace body, which can fully reduce the air intake of the primary air and the primary exhaust gas at the burner. On the premise of meeting the corresponding air intake demand, it is beneficial to reduce the number of burner openings and simplify the structure of the burner. On the premise of ensuring the mechanical performance, the structural size of the burner can be minimized to the greatest extent. In particular, after reducing the number of burner openings, the space occupied by related pipelines is saved, and the length and diameter of the burner can be minimized to the greatest extent. It is not only convenient for industrial installation and application, but also can save metal and refractory materials, which is beneficial to reduce equipment cost investment. At the same time, compared with the prior art, this embodiment, since the secondary air duct and the secondary exhaust gas duct are both arranged on the furnace body, thereby simplifying the burner structure, there is no need to set up multiple layers of interlayer space in the furnace wall of the burner to serve as circulation channels for air and exhaust gas, thereby reducing the thickness of the furnace wall of the burner to a certain extent, which not only facilitates the production and processing of the burner, but also saves the metal and refractory materials required for production and manufacturing, which is beneficial to reducing the production raw material costs of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 This is a schematic structural diagram of a low-nitrogen tail gas incinerator according to an embodiment of the present invention;

[0023] Figure 2 This is another structural schematic diagram of a low-nitrogen tail gas incinerator according to an embodiment of the present invention;

[0024] Figure 3 For the embodiment of the present invention Figure 2 Cross-section of the middle AA surface;

[0025] Figure 4 For the embodiment of the present invention Figure 2 Another structural cross-section of the AA surface.

[0026] Description of reference numerals:

[0027] Ever-burning lamp 1, ever-burning lamp nozzle 101, gas gun 2, gas inlet 201, gas gun nozzle 202, burner 3, primary air inlet 4, primary air cyclone 401, primary air throat 402, secondary air pipeline 403, secondary air collecting chamber 404, secondary air nozzle 405, exhaust gas main inlet 5, first-level exhaust gas pipeline 501, first-level exhaust gas flow regulating valve 502, first-level exhaust gas inlet 503, first-level exhaust gas collecting chamber 504, first-level exhaust gas throat 505, first-level exhaust gas nozzle 506, second-level exhaust gas flow regulating valve 507, second-level exhaust gas collecting chamber 508, second-level exhaust gas nozzle 509, fire channel 6, inner wall 601, furnace 7, furnace body 8, first cylinder 91, second cylinder 92, partition 10, first-level exhaust gas channel 11. DETAILED DESCRIPTION

[0028] The inventive concepts of the present disclosure will be described below using terms commonly used by those skilled in the art to convey the essence of their work to other persons skilled in the art. However, these inventive concepts can be embodied in many different forms and should not be considered limited to the embodiments described herein.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0031] Example 1

[0032] In existing low-nitrogen tail gas incinerators with graded air distribution, the burner structure is often too complicated, which is not conducive to reducing the structural size of the burner; at the same time, it is difficult to control the temperature in the incinerator furnace and it is difficult to ensure that the production of nitrogen oxides is minimized to the greatest extent.

[0033] In order to solve the problems of the low nitrogen tail gas incinerator in the prior art, such as the burner structure is too complicated and it is difficult to control the temperature in the furnace of the incinerator, this embodiment proposes a low nitrogen tail gas incinerator, as shown in the attached figure. Figure 1-2 As shown, the incinerator includes a furnace body 8 and a burner 3 connected to the furnace body 8. A furnace 7 is provided inside the furnace body 8. The burner 3 includes a fire channel 6. The fire channel 6 is provided on one side of the burner 3 close to the furnace body 8. The burner 3 is connected to the furnace 7 through the fire channel 6.

[0034] The burner 3 also includes a pilot lamp 1, a gas gun 2, a primary air inlet 4, a primary air duct, a primary air throat 402, a first-level exhaust gas inlet 503, and a first-level exhaust gas duct. The primary air duct and the first-level exhaust gas duct are both connected to the fire channel 6 for transporting primary air and first-level exhaust gas into the fire channel 6.

[0035] The gas gun 2 supplies fuel gas to the fire channel 6 through the gas gun nozzle 202, and the pilot light 1 cooperates with the gas gun 2 to ignite the fire.

[0036] The primary air throat 402 is sleeved on the exterior of the pilot lamp 1 and the gas gun 2, while the pilot lamp nozzle 101 is positioned within the annular gap between the primary air throat 402 and the gas gun nozzle 202. The injection port of the pilot lamp nozzle 101, the injection port of the gas gun nozzle 202, the primary air throat 402, and the entrance of the fire channel 6 are aligned, thereby ensuring sufficient mixing of the gas and the combustion-supporting air for full combustion, preventing backflow of the open flame, and improving the safety of the equipment operation.

[0037] The primary air inlet 4 is connected to the primary air throat 402 through a primary air duct, and primary air is introduced into the fire channel 6 through the primary air throat 402; a primary air cyclone 401 is provided in the primary air duct.

[0038] The first-level exhaust gas pipeline is arranged on the outside of the primary air throat 402. The first-level exhaust gas passes through the first-level exhaust gas inlet 503, the first-level exhaust gas pipeline, and the fire channel 6 in sequence and enters the furnace body 8. During this process, the first-level exhaust gas enters the furnace body 8 along the inner wall 601 of the fire channel 6, or in other words, the first-level exhaust gas is mainly distributed between the flame tongue and the inner wall 601 of the fire channel 6, so that on the one hand, the lining of the fire channel 6 can be protected from being burned by the high-temperature flame, which is beneficial to improving the fire resistance of the lining of the fire channel 6. On the other hand, as the fire resistance of the lining of the fire channel 6 is improved, the furnace wall of the burner 3 at the fire channel 6 does not need to be additionally thickened, which is beneficial to simplifying the structure of the burner 3 and saving the production raw materials of the burner 3.

[0039] A secondary air duct 403 and a secondary exhaust gas duct are provided on the furnace body 8 at the furnace chamber 7. The secondary air duct 403 is provided on the outer wall of the furnace body 8, passes through the furnace body 8 and is directly connected to the furnace chamber 7, for introducing secondary air into the furnace chamber 7; the secondary exhaust gas duct is provided on the outer wall of the furnace body 8, passes through the furnace body 8 and is directly connected to the furnace chamber 7, for introducing secondary exhaust gas into the furnace chamber 7.

[0040] During the actual combustion process, the gas used for combustion is sprayed into the fire channel 6 through the nozzle on the gas gun nozzle 202; the primary air rotates at high speed along the burner axis through the primary air cyclone 401, and enters the fire channel 6 through the primary air throat 402, and the first-level exhaust gas enters the fire channel 6 through the first-level exhaust gas pipeline. After the gas, primary air and first-level exhaust gas are mixed in the fire channel 6, they start to burn under the ignition of the eternal lamp 1, and the combustion flame and flue gas flow into the furnace 7; the air that is insufficient for the combustion of gas is supplemented by secondary air, and the high-temperature flue gas from the combustion of gas burns the secondary exhaust gas in the furnace 7. After the gas, exhaust gas and combustion-supporting air are completely burned in the furnace 7, the high-temperature flue gas finally formed flows out of the furnace 7 and recovers the waste heat to the downstream waste heat boiler, and the flue gas that meets environmental protection standards is discharged into the atmosphere.

[0041] Therefore, compared with the prior art, this embodiment simultaneously modifies the burner 3 and the furnace body 8; a primary air inlet 4 and a first-level exhaust gas inlet 503 are set on the burner 3 to introduce the first-level exhaust gas into the fire channel 6. On the one hand, the exhaust gas can be used to dilute the oxygen concentration in the air and reduce the generation of nitrogen oxides by using the oxygen-lean combustion technology. On the other hand, the first-level exhaust gas enters the fire channel 6 along the inner wall 601 of the fire channel 6, which can protect the lining of the fire channel 6 from being burned by the high-temperature flame, which is beneficial to improving the fire resistance of the lining of the fire channel 6. At the same time, as the fire resistance of the lining of the fire channel 6 is improved, the furnace wall of the burner 3 at the fire channel 6 does not need to be additionally thickened, which is beneficial to simplifying the structure of the burner 3 and saving the production raw materials of the burner 3. Or, on this basis, the fire resistance level of the refractory lining can also be reduced, which is beneficial to reducing equipment cost investment.

[0042] At the same time, the furnace body 8 of this embodiment is provided with a secondary air duct 403 and a secondary exhaust gas duct. On the one hand, by controlling the intake of the secondary air and the secondary exhaust gas, the temperature inside the furnace 7 is controlled, which is beneficial to controlling the temperature distribution inside the furnace 7, reducing the high temperature area, and minimizing the generation of nitrogen oxides. On the other hand, since the diameter, length and other dimensional data of the furnace body 8 itself are relatively large, there is no need to change the shape and structure of the furnace body 8. It is sufficient to only provide the secondary air duct 403 and the secondary exhaust gas duct on the furnace body 8, and at the same time, the secondary air duct 403 and the secondary exhaust gas duct are directly supplied to the furnace 7 through the furnace body 8. The internal introduction of secondary air and secondary exhaust gas can substantially reduce the intake volume of primary air and primary exhaust gas at the burner 3. While meeting the corresponding intake volume requirements, this helps reduce the number of openings in the burner 3, simplifies the structure of the burner 3, and minimizes the structural dimensions of the burner 3 while ensuring mechanical performance. In particular, after reducing the number of openings in the burner 3, the space occupied by related pipelines is eliminated, minimizing the length and diameter of the burner 3. This not only facilitates industrial installation and application, but also saves metal and refractory materials, thereby reducing equipment costs. Furthermore, compared to the prior art, this embodiment simplifies the structure of the burner 3 by arranging the secondary air pipeline 403 and the secondary exhaust gas pipeline on the furnace body 8. This eliminates the need for multiple interlayer spaces within the furnace wall of the burner 3 to serve as air and exhaust gas circulation channels, thereby reducing the thickness of the furnace wall of the burner 3 to a certain extent. This not only facilitates the production and processing of the burner 3, but also saves metal and refractory materials required for production, thereby reducing the cost of raw materials required for equipment production.

[0043] Example 2

[0044] In order to facilitate the control of the exhaust gas intake, as shown in the attached Figure 1-2 As shown, this embodiment improves the exhaust gas intake structure based on embodiment 1:

[0045] The incinerator includes a total exhaust gas inlet 5, which is connected to the inlet of the secondary exhaust gas pipeline through a secondary exhaust gas flow regulating valve 507, and is used to control the intake volume of the secondary exhaust gas; the total exhaust gas inlet 5 is provided with a first-level exhaust gas pipeline 501 at the feed port of the second-level exhaust gas flow regulating valve 507, and the first-level exhaust gas pipeline 501 serves as a branch, and the inlet of the first-level exhaust gas pipeline 501 is connected to the total exhaust gas inlet 5, and the outlet of the first-level exhaust gas pipeline 501 is connected to the first-level exhaust gas inlet 503, and the first-level exhaust gas pipeline 501 is provided with a first-level exhaust gas flow regulating valve 502, which is used to control the intake volume of the first-level exhaust gas.

[0046] By improving the exhaust gas intake structure, the exhaust gas only needs to be transported through a single main pipeline. During exhaust gas intake, the intake volume of the primary and secondary exhaust gases can be conveniently controlled by adjusting the openings of the primary exhaust gas flow control valve 502 and the secondary exhaust gas flow control valve 507. Preferably, in this embodiment, by adjusting the openings of the primary exhaust gas flow control valve 502 and the secondary exhaust gas flow control valve 507, the ratio of the intake volume of the primary exhaust gas to the intake volume of the secondary exhaust gas is 1:9, which is conducive to regulating the temperature within the incinerator furnace to ensure that the generation of nitrogen oxides is minimized.

[0047] In addition, a first-stage exhaust gas collecting chamber 504 is provided in the first-stage exhaust gas pipeline, so that the first-stage exhaust gas entering through the first-stage exhaust gas inlet 503 can be buffered and decelerated in the first-stage exhaust gas collecting chamber 504 .

[0048] Similarly, a secondary exhaust gas collecting chamber 508 is provided at the connection between the secondary exhaust gas pipeline and the outer wall of the furnace body 8; a secondary air collecting chamber 404 is provided at the connection between the secondary air pipeline 403 and the outer wall of the furnace body 8. Specifically, the secondary exhaust gas collecting chamber 508 and the secondary air collecting chamber 404 are both vertically provided on the outer wall of the furnace body 8 and are both wound and extended along the axial direction of the furnace body 8, as shown in FIG. Figure 2 As shown, the cross sections of the secondary exhaust gas collecting chamber 508 and the secondary air collecting chamber 404 are both rectangular. Figure 2 The paper direction shown extends inward or outward around the outer wall of the furnace body 8 in a ring shape.

[0049] The secondary exhaust gas pipeline passes through the furnace wall of the furnace body 8 through the secondary exhaust gas nozzle 509 to transport the secondary exhaust gas into the furnace body 8; the secondary air pipeline 403 passes through the furnace wall of the furnace body 8 through the secondary air nozzle 405 to transport the secondary air into the furnace body 8.

[0050] Regarding the setting of the secondary exhaust gas nozzle 509, the secondary exhaust gas nozzle 509 penetrates the furnace wall of the furnace body 8 along an inclined direction, so that the angle between the axis direction of the furnace body 8 from the fire channel 6 to the furnace 7 and the injection direction of the secondary exhaust gas is 30°~60°; similarly, the secondary air nozzle 405 penetrates the furnace wall of the furnace body 8 along an inclined direction, so that the angle between the axis direction of the furnace body 8 from the fire channel 6 to the furnace 7 and the injection direction of the secondary air is 30°~60°; thus, the setting method of the secondary exhaust gas nozzle 509 and the secondary air nozzle 405 is conducive to ensuring that the secondary exhaust gas, secondary air and flue gas are fully mixed, which facilitates uniform temperature distribution in the furnace 7.

[0051] The secondary air nozzle 405 is arranged at the air outlet end of the secondary air collecting chamber 404, and the secondary exhaust gas nozzle 509 is arranged at the air outlet end of the secondary exhaust gas collecting chamber 508; in the direction of circumferential extension along the furnace body 8, the secondary air nozzle 405 and the secondary exhaust gas nozzle 509 are respectively provided in plurality and arranged at equal intervals. Through this arrangement, the secondary air and the secondary exhaust gas can be evenly introduced into the furnace 7 on the peripheral wall of the furnace 7, so that the secondary air and the secondary exhaust gas are more evenly distributed, which is conducive to uniform mixing with the flue gas, improving the combustion mixing effect, and improving the combustion efficiency.

[0052] Regarding the setting of the first-stage exhaust pipeline, this application proposes two setting methods, as specifically described in Example 3 and Example 4.

[0053] Example 3

[0054] As attached Figure 1 As shown, this embodiment proposes a setting method for the first-level tail gas pipeline, wherein the first-level tail gas pipeline includes a first-level tail gas inlet 503 and a first-level tail gas throat 505 connected in sequence, and the material is fed through the first-level tail gas inlet 503 and discharged through the first-level tail gas throat 505. The first-level tail gas throat 505 is sleeved on the outside of the primary air throat 402. Preferably, the first-level tail gas throat 505 is concentrically arranged with the primary air throat 402. Therefore, during the intake process of the first-level tail gas, the first-level tail gas can enter the furnace body 8 along the inner wall of the fire channel 6, or in other words, the first-level tail gas is mainly distributed between the flame and the inner wall of the fire channel 6, thereby protecting the lining of the fire channel 6 from being burned by the high-temperature flame. The first-level tail gas throat 505 and the primary air throat 402 are coaxially embedded in the heat-insulating refractory material.

[0055] Furthermore, the primary exhaust gas throat 505, the primary air throat 402, the fire channel 6, the gas gun 2, and the housing of the burner 3 are arranged concentrically and coaxially. The primary exhaust gas throat 505, the primary air throat 402, the gas gun nozzle 202, and the entrance of the fire channel 6 are arranged flush with each other, thereby ensuring that the gas and the combustion-supporting air are fully mixed and burned, preventing the backflow of the open flame, improving the safety of the equipment operation, and ensuring that the main distribution position of the primary exhaust gas is located between the flame and the inner wall 601 of the fire channel 6.

[0056] In addition, a primary exhaust gas collecting chamber 504 is provided in the primary exhaust gas pipeline, the inlet of the primary exhaust gas collecting chamber 504 is communicated with the primary exhaust gas inlet 503 , and the outlet of the primary exhaust gas collecting chamber 504 is communicated with the primary exhaust gas throat 505 .

[0057] As for the specific structure of the first-stage exhaust gas collecting chamber 504, the outer wall of the first-stage exhaust gas collecting chamber 504 is composed of a cylinder and a cone, the cylinder and the cone are coaxially arranged, the inner diameter of the large end of the cone is the same as the inner diameter of the cylinder, and the small end of the cone is close to the fire channel 6; the inner wall of the first-stage exhaust gas collecting chamber 504 is also composed of a cylinder and a cone, and the structural arrangement is the same as the outer wall, the inner and outer walls are coaxially arranged, and the inner and outer wall cylinder ends of the first-stage exhaust gas collecting chamber 504 are sealed with a circular ring plate to form a semi-enclosed space, and the semi-enclosed space is the first-stage exhaust gas collecting chamber 504. The gap formed by the inner and outer wall cones of the first-stage exhaust gas collecting chamber 504 can be regarded as the first-stage exhaust throat 505. The smallest inner hole of the inner wall cone of the first-stage exhaust gas collecting chamber 504 can be regarded as the primary air throat 402. The first-stage exhaust gas throat 505 and the primary air throat 402 are two concentric throats, called double throats; thus, through this structural setting of the first-stage exhaust gas collecting chamber 504, the position and matching relationship of the first-stage exhaust gas throat 505 and the primary air throat 402 can be directly limited, thereby simultaneously limiting the air intake conditions of the first-stage exhaust and the primary air into the fire channel 6, avoiding the setting of additional air intake structures, thereby further simplifying the structure of the burner 3, not only facilitating industrial production and installation, but also saving metal and refractory materials, which is beneficial to reducing equipment cost investment.

[0058] Example 4

[0059] As attached Figure 2 As shown, this embodiment proposes a configuration for a primary exhaust gas pipeline. For ease of description, some of the structures of this embodiment are the same as those of Example 3, with the difference being that the primary exhaust gas pipeline includes a primary exhaust gas inlet 503 and a primary exhaust gas nozzle 506, which are connected in sequence. Material is fed through the primary exhaust gas inlet 503 and discharged through the primary exhaust gas nozzle 506. The primary exhaust gas nozzle 506 is disposed outside the primary air throat 402 and surrounds the primary air throat 402. Thus, during the intake process of the primary exhaust gas, the primary exhaust gas can enter the furnace body 8 along the inner wall of the fire channel 6.

[0060] Similarly, a first-stage exhaust gas collecting chamber 504 is provided in the first-stage exhaust gas pipeline, the inlet of the first-stage exhaust gas collecting chamber 504 is communicated with the first-stage exhaust gas inlet 503 , and the outlet of the first-stage exhaust gas collecting chamber 504 is communicated with the first-stage exhaust gas nozzle 506 .

[0061] As for the specific structure of the first-stage exhaust gas collecting chamber 504, it is different from that in Example 3. The first-stage exhaust gas collecting chamber 504 is a cavity formed by two concentric inner and outer cylinders and two concentric annular plates.

[0062] Example 5

[0063] As attached Figure 2-3 As shown, this embodiment, based on the fourth embodiment, specifically introduces the first-stage exhaust nozzle 506:

[0064] The first-stage exhaust nozzle 506 includes a plurality of tube bodies, which are arranged in a circular array around the outside of the primary air throat 402; for any one of the tube bodies, one end of the tube body is connected to the first-stage exhaust gas collecting chamber 504, and the other end of the tube body is connected to the fire channel 6, so that the first-stage exhaust gas is sprayed from the first-stage exhaust gas collecting chamber 504 into the fire channel 6.

[0065] Example 6

[0066] As attached Figure 2-3 As shown, this embodiment, based on the fourth embodiment, specifically introduces another structure of the first-stage exhaust nozzle 506:

[0067] The first-stage exhaust nozzle 506 is in the form of a sleeve, comprising a first cylinder 91 and a second cylinder 92. The outer diameter of the first cylinder 91 is smaller than the inner diameter of the second cylinder 92, that is, the second cylinder 92 is sleeved outside the first cylinder 91. The first cylinder 91 and the second cylinder 92 form a first-stage exhaust channel 11 for conveying the first-stage exhaust gas.

[0068] One end of the primary exhaust gas channel 11 is connected to the primary exhaust gas collecting chamber 504 , and the other end of the primary exhaust gas channel 11 is connected to the fire channel 6 , so that the primary exhaust gas is sprayed from the primary exhaust gas collecting chamber 504 into the fire channel 6 .

[0069] At the same time, in order to ensure the mechanical properties of the relevant structure and the convenience of construction, multiple partitions 10 are set in the first-level exhaust channel 11, one end of the partition 10 is connected to the first cylinder 91, and the other end of the partition 10 is connected to the second cylinder 92.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-nitrogen tail gas incinerator, comprising a furnace body (8), a burner (3) connected to the furnace body (8), and a furnace (7) provided inside the furnace body (8); characterized in that: The burner (3) includes a fire channel (6) and a primary air duct and a primary tail gas duct connected to the fire channel (6), for conveying primary air and primary tail gas into the fire channel (6); the furnace body (8) is provided with a secondary air duct (403) and a secondary tail gas duct, the secondary air duct (403) passing through the furnace body (8) and being directly connected to the furnace (7), for introducing secondary air into the furnace (7); the secondary tail gas duct passing through the furnace body (8) and being directly connected to the furnace (7), for introducing secondary tail gas into the furnace (7); The secondary air pipeline (403) is arranged on the outer wall of the furnace body (8), and the secondary exhaust gas pipeline is arranged on the outer wall of the furnace body (8); The secondary tail gas pipeline penetrates the furnace wall of the furnace body (8) through the secondary tail gas nozzle (509), and the secondary tail gas nozzle (509) penetrates the furnace wall of the furnace body (8) along an inclined direction, and the angle between the axis direction of the furnace body (8) from the fire channel (6) to the furnace hearth (7) and the injection direction of the secondary tail gas is 30°~60°; the secondary air pipeline (403) penetrates the furnace wall of the furnace body (8) through the secondary air nozzle (405), and the secondary air nozzle (405) penetrates the furnace wall of the furnace body (8) along an inclined direction, and the angle between the axis direction of the furnace body (8) from the fire channel (6) to the furnace hearth (7) and the injection direction of the secondary air is 30°~60°; The inlet of the primary air duct is the primary air inlet (4), the outlet of the primary air duct is the primary air throat (402), and the first-level exhaust gas duct is sleeved outside the primary air throat (402); the first-level exhaust gas duct comprises a first-level exhaust gas inlet (503) and a first-level exhaust gas throat (505) that are connected in sequence, and the first-level exhaust gas throat (505) is sleeved outside the primary air throat (402); The burner (3) comprises a permanent lamp (1) and a gas gun (2), wherein the permanent lamp (1) has a permanent lamp nozzle (101), and the gas gun (2) has a gas gun nozzle (202); The gas gun (2) supplies fuel gas to the fire channel (6) through the gas gun nozzle (202); the primary air throat (402) is sleeved on the outside of the eternal lamp (1) and the gas gun (2); the eternal lamp nozzle (101) is arranged in the annular gap between the primary air throat (402) and the gas gun nozzle (202); the spray port of the eternal lamp nozzle (101), the spray port of the gas gun nozzle (202), the primary air throat (402), and the entrance of the fire channel (6) are arranged flush with each other; The first-stage tail gas throat (505), the primary air throat (402), the fire channel (6), the gas gun (2), and the shell of the burner (3) are arranged concentrically and coaxially; the first-stage tail gas throat (505), the primary air throat (402), the gas gun nozzle (202), and the entrance of the fire channel (6) are arranged flush with each other; A first-stage tail gas collecting chamber (504) is provided in the first-stage tail gas pipeline. The outer wall of the first-stage tail gas collecting chamber (504) is composed of a cylinder and a cone. The cylinder and the cone are coaxially arranged. The inner diameter of the large end of the cone is the same as the inner diameter of the cylinder. The small end of the cone is close to the fire channel (6). The inner wall of the first-stage tail gas collecting chamber (504) is also composed of a cylinder and a cone. The structural arrangement is the same as that of the outer wall. The inner and outer walls are coaxially arranged. The inner and outer walls of the first-stage tail gas collecting chamber (504) are circular. The end of the cylinder is sealed with a circular ring plate to form a semi-enclosed space, which is the first-stage exhaust gas collecting chamber (504). The gap formed by the inner and outer wall cones of the first-stage exhaust gas collecting chamber (504) is the first-stage exhaust gas throat (505). The smallest inner hole of the inner wall cone of the first-stage exhaust gas collecting chamber (504) is the primary air throat (402). The first-stage exhaust gas throat (505) and the primary air throat (402) are two concentric throats, which are called double throats.

2. A low nitrogen tail gas incinerator according to claim 1, characterized in that: The incinerator comprises a tail gas main inlet (5), the tail gas main inlet (5) is connected to the inlet of the secondary tail gas pipeline through a secondary tail gas flow regulating valve (507), a primary tail gas pipeline (501) is provided at the feed port of the secondary tail gas flow regulating valve (507) of the tail gas main inlet (5), the inlet of the primary tail gas pipeline (501) is communicated with the tail gas main inlet (5), the outlet of the primary tail gas pipeline (501) is communicated with the inlet of the primary tail gas pipeline, and the primary tail gas pipeline (501) is provided with a primary tail gas flow regulating valve (502).

3. A low nitrogen tail gas incinerator according to claim 1, characterized in that: The first-stage tail gas throat (505) and the primary air throat (402) are arranged concentrically.

4. A low nitrogen tail gas incinerator according to claim 1, characterized in that: The inlet of the first-stage tail gas collecting chamber (504) is communicated with the first-stage tail gas inlet (503), and the outlet of the first-stage tail gas collecting chamber (504) is communicated with the first-stage tail gas throat (505).

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