Tail gas treatment system and process

Abstract

The present application discloses a tail gas treatment system and process, the system includes a defoaming device, a supercharging device, a burner, an incinerator and a chimney; the input end of the defoaming device is connected to a tail gas source, and the tail gas can be defoamed and defoamed; the burner and the incinerator are respectively provided with a first tail gas inlet and a second tail gas inlet; the input end of the supercharging device is connected to the output end of the defoaming device, and the output end of the supercharging device is respectively connected to the first tail gas inlet and the second tail gas inlet, and the tail gas after defoaming and defoaming can be transported to the inside of the burner and the incinerator respectively; the inside of the burner is provided with a combustion air component, the input end of the combustion air component is connected to an external air source, and the output end of the combustion air component extends into the inside of the burner and the incinerator; the tail end of the burner extends into the combustion chamber of the incinerator. The present application realizes that the generation of NOx can be effectively reduced in the process of tail gas ignition and combustion, and the cost consumed by the overall tail gas treatment system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of tail gas treatment, and in particular to a tail gas treatment system and process. Background Art

[0002] In the natural gas purification plant, the measured H2S emission concentration in the sulfur recovery tail gas is 52.2 mg / m 3 The H2S emission concentration in the TEG triethylene glycol dehydration unit is 172.3 mg / m 3 , concentrations were greater than 10 mg / m 3 The "Design Specifications for Natural Gas Purification Plants" (GB / T51248-2017) stipulates that if the hydrogen sulfide content in the sulfur recovery tail gas of the natural gas purification plant is greater than 10 mg / m 3 The "Design Specifications for Natural Gas Purification Plants" (GB / T51248-2017) stipulates that if the hydrogen sulfide content in the sulfur recovery tail gas of a natural gas purification plant is greater than 10 mg / m 3 , the tail gas from the sulfur recovery unit should be incinerated, and the exhaust gas after incineration should meet the requirements of the "Emission Standards for Air Pollutants from Onshore Petroleum and Natural Gas Exploitation Industry" (GB39728-2020), and an artificial sampling port and an online monitoring device for gas composition should be installed after incineration. Hydrogen sulfide is flammable, explosive, toxic and corrosive. H2S is a strong neurotoxin and has a strong irritating effect on mucous membranes. Its toxicity is 5 to 6 times greater than that of CO. my country stipulates that the maximum hydrogen sulfide concentration that almost all workers will not be adversely affected by long-term exposure is 15 mg / m 3 (10ppm); if it exceeds 75mg / m 3 (50ppm), the sense of smell will be lost after 15 minutes of exposure. If the exposure time exceeds 1 hour, it may cause headache, dizziness and / or shaking, pulmonary edema, and may also cause serious irritation or damage to the eyes of personnel.

[0003] In order to reduce and control the content of hydrogen sulfide in the sulfur recovery tail gas of the natural gas purification plant and ensure that the tail gas emissions and air pollution control in the area meet the relevant national, industry and local standards, the existing technology cannot effectively reduce the generation of NOx (nitrogen oxides) during the tail gas combustion treatment process, resulting in a high cost for the overall tail gas treatment system. Summary of the invention

[0004] The embodiments of the present application provide a tail gas treatment system and process, thereby solving the technical problem in the prior art that the generation of NOx cannot be effectively reduced during the exhaust gas combustion treatment process, resulting in a high cost for the overall exhaust gas treatment system. The embodiment of the present application achieves the ability to effectively reduce the generation of NOx during both the exhaust gas ignition and combustion processes, thereby reducing the cost for the overall exhaust gas treatment system.

[0005] In the first aspect, an embodiment of the present invention provides an exhaust gas treatment system, including a defoaming device, a boosting device, a burner, an incinerator and a chimney; the input end of the defoaming device is connected to an exhaust gas source, and can perform defoaming and defoaming treatment on the exhaust gas; the burner and the incinerator are respectively provided with a first exhaust gas inlet and a second exhaust gas inlet; the input end of the boosting device is connected to the output end of the defoaming device, and the output end of the boosting device is respectively connected to the first exhaust gas inlet and the second exhaust gas inlet, and can transport the exhaust gas after defoaming and defoaming treatment to the burner and the incinerator respectively; the interior of the burner is provided with a combustion-supporting air component, the input end of the combustion-supporting air component is connected to an external air source, and the output end of the combustion-supporting air component extends into the burner and the incinerator; the tail end of the burner extends into the combustion chamber of the incinerator.

[0006] In combination with the first aspect, in a possible implementation, the combustion-supporting air component includes an air inlet pipe, a buffer bellows, a first ventilation pipe, a second ventilation pipe, a rotating pipe, a switching valve core, a blocking block, and a stabilizing bellows; the output end of the air inlet pipe is connected to the interior of the buffer bellows, and the output end of the buffer bellows is connected to the input end of the first ventilation pipe; the rotating pipe is sleeved on the outer side of the first ventilation pipe and is rotatably connected to the outer side of the first ventilation pipe; the switching valve core is arranged between the first ventilation pipe and the second ventilation pipe, and is slidably and sealingly connected to the inner side of the rotating pipe; the switching valve core is provided with a first air outlet at the end close to the second ventilation pipe, and the outer side of the rotating pipe is provided with a The second air outlet, the blocking block is arranged on the inner side of the input end of the second ventilation pipe; the input end of the second ventilation pipe is connected with the output end of the rotating tube, and the input end of the second ventilation pipe and the output end of the rotating tube are rotating and sealed; a spiral groove is provided on the outer side of the switching valve core, and a protrusion is fixedly connected to the inner side of the rotating tube, and the protrusion is slidably matched with the spiral groove; the rotating tube can drive the switching valve core to slide along the length direction of the rotating tube, so that the first air outlet is closed or opened, and the second air outlet is opened or closed; the stabilizing bellows is sleeved on the outer side of the rotating tube, and the output end of the stabilizing bellows and the output end of the second ventilation pipe both extend into the combustion chamber of the incinerator.

[0007] In combination with the first aspect, in a possible implementation, the output ends of the second ventilation pipe and the stabilizing bellows extend into the combustion chamber of the incinerator at different lengths; the output end of the second ventilation pipe is arranged corresponding to the output end of the exhaust pipe to facilitate ignition of the exhaust gas here.

[0008] In combination with the first aspect, in a possible implementation, it also includes a fuel gas pipeline and an exhaust gas pipeline; the first exhaust gas inlet is provided with the exhaust gas pipeline, and the input end of the exhaust gas pipeline is connected to the output end of the boosting device; the output end of the exhaust gas pipeline extends into the interior of the second ventilation pipe, the output end of the fuel gas pipeline extends into the interior of the second ventilation pipe and the exhaust gas pipeline, and extends to the combustion chamber of the incinerator, and the input end of the fuel gas pipeline is connected to an external fuel gas source.

[0009] In combination with the first aspect, in a possible implementation, the switching valve core has a first position and a second position; when the switching valve core is in the first position, the outer side of the switching valve core blocks the second air outlet, and the first ventilation pipe and the second ventilation pipe are connected through the first air outlet; when the switching valve core is in the second position, the first air outlet of the switching valve core is blocked by the blocking block, and the second air outlet is opened, and the first ventilation pipe is connected to the inside of the stabilizing bellows through the second air outlet.

[0010] In combination with the first aspect, in a possible implementation, a fixing plate is fixedly connected to the inner side of the input end of the second ventilation pipe, and the blocking block is fixedly connected to the center of the fixing plate; a semicircular through groove is opened on the fixing plate; a guide rod is arranged between the switching valve core and the fixing plate, one end of the guide rod is fixedly connected to the switching valve core, and the other end of the guide rod passes through the fixing plate and is slidably connected to the fixing plate.

[0011] In combination with the first aspect, in a possible implementation, it also includes a plurality of groups of step injection assemblies arranged in a circular array at the output end of the stabilizing bellows; each group of the step injection assemblies includes a plurality of nozzles arranged along the radial direction of the stabilizing bellows, and the lengths of the plurality of nozzles in each group decrease successively.

[0012] In combination with the first aspect, in a possible implementation manner, the output end of the second ventilation pipe is fixedly connected to a reducing pipe, and the reducing pipe is provided with a plurality of negative pressure holes along a radial direction.

[0013] In a second aspect, the present application provides a tail gas treatment process, including:

[0014] Gather multiple exhaust gas sources through an exhaust gas manifold;

[0015] The tail gas output from the tail gas manifold is defoamed and defoamed by a defoaming device;

[0016] The tail gas after defoaming and foaming treatment is transported to the burner and incinerator through the booster device;

[0017] The external combustion air is delivered to the combustion chamber of the burner and the incinerator through the combustion air component, and then mixed with the exhaust gas delivered to the burner and the incinerator to achieve ignition and subsequent combustion of the exhaust gas;

[0018] The exhaust gas after combustion in the incinerator is finally discharged through the chimney.

[0019] In combination with the second aspect, in a possible implementation method, the ignition of the exhaust gas also includes introducing an external fuel gas source into the burner, and merging it with the exhaust gas and combustion-supporting air inside the burner to assist in the smooth ignition of the exhaust gas; the exhaust gas after combustion in the incinerator includes exhaust gas after combustion in the combustion chamber of the incinerator and exhaust gas after cooling in the cooling chamber of the incinerator.

[0020] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0021] The embodiment of the present invention adopts a defoaming device, a supercharging device, a burner, an incinerator and a chimney; the input end of the defoaming device is connected to the tail gas source, so that the tail gas can be defoamed and defoamed;

[0022] By providing a first tail gas inlet and a second tail gas inlet, the tail gas after defoaming and foaming treatment can be transported to the burner and the incinerator respectively through the booster device, so that a part of the tail gas enters the burner for ignition, and most of the tail gas enters the incinerator for combustion after ignition;

[0023] By arranging a combustion air component inside the burner, the input end of the combustion air component is connected to an external air source, and the output end of the combustion air component extends into the burner and the incinerator; the tail end of the burner extends into the combustion chamber of the incinerator, the ignition of a part of the exhaust gas in the burner and the combustion process of most of the exhaust gas in the incinerator can be finely controlled, and the generation of NOx can be effectively controlled during the ignition of the burner and the combustion process of the incinerator;

[0024] The invention effectively solves the technical problem that the generation of NOx cannot be effectively reduced during the exhaust gas combustion treatment process in the prior art, resulting in a high cost for the overall exhaust gas treatment system. The invention realizes that the generation of NOx can be effectively reduced during the exhaust gas ignition and combustion processes, thereby reducing the cost for the overall exhaust gas treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A process flow chart of an exhaust gas treatment system provided in an embodiment of the present application;

[0027] Figure 2 An axonometric view of a combustion air assembly provided for an embodiment of the present application;

[0028] Figure 3 for Figure 2 Right view in;

[0029] Figure 4 for Figure 3 Isometric section view in the AA direction;

[0030] Figure 5 for Figure 4 A partial enlarged view of the middle B area;

[0031] Figure 6 for Figure 2 Axonometric drawing after removing the buffer bellows and stabilizing bellows;

[0032] Figure 7 An axonometric view of the switching valve core, the blocking block, and the second ventilation pipe provided in an embodiment of the present application;

[0033] Figure 8 for Figure 7 A partial enlarged view of the middle C area;

[0034] Fig. 9 This is a schematic diagram of the structure of the incinerator provided in an embodiment of the present application.

[0035] Icons: 1-defoaming device; 2-boosting device; 3-burner; 4-incinerator; 41-second tail gas inlet; 42-shell; 43-refractory layer; 44-insulation layer; 5-chimney; 6-combustion air assembly; 61-air inlet pipe; 62-buffer bellows; 63-first ventilation pipe; 631-first flange; 64-second ventilation pipe; 641-fixed plate; 642-semicircular groove; 643-reduced diameter pipe; 644-negative pressure hole; 65-rotating pipe ;651-second air outlet;652-protrusion;66-switching valve core;661-first air outlet;662-spiral groove;663-guide rod;67-blocking block;68-stabilizing bellows;69-connecting box;691-second flange;7-fuel gas pipeline;8-exhaust gas pipeline;9-step injection assembly;91-nozzle;10-sulfur recovery unit;11-TEG regeneration unit;12-exhaust manifold;13-combustion-supporting fan;14-cooling fan. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the embodiments of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to the specific circumstances.

[0038] Reference Figure 1The embodiment of the present invention provides an exhaust gas treatment system, including a defoaming device 1, a boosting device 2, a burner 3, an incinerator 4 and a chimney 5; the input end of the defoaming device 1 is connected to a tail gas source, and can perform defoaming and defoaming treatment on the tail gas; the burner 3 and the incinerator 4 are respectively provided with a first tail gas inlet and a second tail gas inlet 41; the input end of the boosting device 2 is connected to the output end of the defoaming device 1, and the output end of the boosting device 2 is respectively connected to the first tail gas inlet and the second tail gas inlet 41, so that the tail gas after defoaming and defoaming treatment can be transported to the burner 3 and the incinerator 4 respectively; a combustion-supporting air component 6 is provided inside the burner 3, the input end of the combustion-supporting air component 6 is connected to an external air source, and the output end of the combustion-supporting air component 6 extends into the burner 3 and the incinerator 4; the tail end of the burner 3 extends into the combustion chamber of the incinerator 4. Specifically, in the embodiment of the present application, the tail gas generated by the sulfur recovery device 10 and the TEG regeneration device 11 is treated, and the tail gas manifold 12 collects and mixes the two tail gases of the sulfur recovery device 10 and the TEG regeneration device 11 through the pipeline, and then enters the defoaming device 1 for defoaming and defoaming treatment. The treated gas is pressurized by the booster device 2 and then blown into the incinerator 4. Before the incinerator 4 burns, it is ignited and burned by the burner 3, and then fully burned in the incinerator 4. After H2S is converted into SO2, it is cooled to the discharge temperature in the cooling chamber of the incinerator 4 and discharged through the chimney 5; in the embodiment of the present application, the booster device 2 uses a booster fan.

[0039] Reference Figure 2-Figure 9The combustion air assembly 6 includes an air inlet pipe 61, a buffer wind box 62, a first ventilation pipe 63, a second ventilation pipe 64, a rotating pipe 65, a switching valve core 66, a blocking block 67, and a stabilizing wind box 68; the output end of the air inlet pipe 61 is connected to the inside of the buffer wind box 62, and the output end of the buffer wind box 62 is connected to the input end of the first ventilation pipe 63; the rotating pipe 65 is sleeved on the outer side of the first ventilation pipe 63 and is rotatably connected to the outer side of the first ventilation pipe 63; the switching valve core 66 is arranged between the first ventilation pipe 63 and the second ventilation pipe 64, and is slidably and sealedly connected to the inner side of the rotating pipe 65; the switching valve core 66 is provided with a first air outlet 661 at the end near the second ventilation pipe 64, and a second air outlet 65 is provided on the outer side of the rotating pipe 65 1. The blocking block 67 is arranged on the inner side of the input end of the second ventilation pipe 64; the input end of the second ventilation pipe 64 is connected with the output end of the rotating pipe 65, and the input end of the second ventilation pipe 64 and the output end of the rotating pipe 65 are connected in a rotating sealing manner; a spiral groove 662 is provided on the outer side of the switching valve core 66, and a protrusion 652 is fixedly connected to the inner side of the rotating pipe 65, and the protrusion 652 is slidably matched with the spiral groove 662; the rotating pipe 65 can drive the switching valve core 66 to slide along the length direction of the rotating pipe 65, so that the first air outlet 661 is closed or opened, and the second air outlet 651 is opened or closed; the stabilizing bellows 68 is sleeved on the outer side of the rotating pipe 65, and the output end of the stabilizing bellows 68 and the output end of the second ventilation pipe 64 are both extended into the combustion chamber of the incinerator 4.Specifically, in the embodiment of the present application, the rotating tube 65 is respectively connected to the first ventilation tube 63 and the second ventilation tube 64 by a rotating seal, the rotating tube 65 and the switching valve core 66 are connected by a sliding seal, and a plurality of second air outlets 651 are arranged in a circular array; the combustion-supporting air is transported by the combustion-supporting fan 13, enters from the air inlet pipe 61, and then enters the buffer wind box 62 for buffering, wherein the axis of the air inlet pipe 61 is nearly tangent to the inner side of the buffer wind box 62, so that the airflow after entering the buffer wind box 62 can be The interior of the buffer bellows 62 presents a spiral path to prevent excessive airflow from having an adverse effect on subsequent ignition and combustion. The airflow is stabilized for the first time through the buffer bellows 62, and then enters the first ventilation pipe 63 from the buffer bellows 62. At this time, the switching valve core 66 is in the first position and the second air outlet 651 is blocked. The stabilized airflow passes through the first air outlet 661 of the switching valve core 66, and then enters the input end of the second ventilation pipe 64, and is finally output from the output end of the second ventilation pipe 64. At the same time, the exhaust gas and the fuel The feed gas is introduced from the tail gas pipeline 8 and the fuel gas pipeline 7 respectively and passes through the inside of the second ventilation pipe 64, and finally merges with the air at the output end of the second ventilation pipe 64 and is successfully ignited there; when the tail gas is successfully ignited at the output end of the second ventilation pipe 64, the rotating tube 65 is controlled to rotate, and the switching valve core 66 is moved toward the second ventilation pipe 64 through the cooperation of the protrusion 652 and the spiral groove 662, so that the first air outlet 661 gradually abuts against the end of the blocking block 67, and the first air outlet 661 is finally blocked, and the exhaust gas is ignited. The air entering the first ventilation pipe 63 cannot continue to pass through the first air outlet 661. At the same time, due to the movement of the switching valve core 66, the second air outlet 651 is opened, and the air in the first ventilation pipe 63 enters the stabilizing bellows 68 from the second air outlet 651 to diffuse, thereby realizing the second stabilization treatment of the airflow. The air entering the stabilizing bellows 68 is finally transported from the output end of the stabilizing bellows 68 to the combustion chamber of the incinerator 4, and merges with the exhaust gas transported from the second exhaust inlet 41, and is fully mixed and burned here.

[0040] In the embodiment of the present application, by setting a buffer bellows 62 and a stabilizing bellows 68, the airflow entering the combustion chamber can be stabilized twice, thereby avoiding the phenomenon of rapid impact of the airflow entering the combustion chamber, and allowing the air and the exhaust gas entering the combustion chamber to be fully mixed, which is beneficial to the subsequent full combustion, thereby effectively reducing the generation of NOx; in the embodiment of the present application, by setting a buffer bellows 62, the airflow in the air inlet pipe 61 can be buffered and stabilized, and the exhaust gas, fuel gas and air can be premixed in advance before the burner 3 is ignited, and the amount of air can be controlled to be small, so that during the ignition stage of the burner 3, the exhaust gas in the combustion chamber, due to lack of oxygen, only part of the fuel is burned, and the flame temperature is low, which can reduce the generation of NOx. ; In the embodiment of the present application, a portion of the exhaust gas enters the furnace through the burner 3, and most of the exhaust gas (acid gas) enters the furnace in several tangential directions along the cylinder of the incinerator 4, which not only ensures the low-nitrogen combustion characteristics, but also ensures the strong mixing and combustion of the exhaust gas (acid gas), which can reduce the generation of NOx; the low-nitrogen combustion in the embodiment of the present application refers to that a portion of the exhaust gas can effectively reduce the generation of NOx during the ignition and combustion stages of the burner 3, and the strong mixing and combustion of the exhaust gas refers to that most of the exhaust gas incinerator 4 cylinder is divided into several strands and enters the furnace tangentially with the air introduced into the combustion chamber for mixed combustion, that is, the ignition stage of the burner 3 is fully controlled to be oxygen-depleted combustion, and the combustion stage of the incinerator 4 is oxygen-rich and fully burned, thereby ultimately effectively controlling the generation of NOx during the exhaust gas treatment process. In addition, in the embodiment of the present application, by providing a rotating tube 65, a first ventilation pipe 63, a second ventilation pipe 64 and a switching valve core 66, it is possible to conveniently control the air intake requirements during the ignition stage of the burner 3 and the combustion stage of the incinerator 4, and then, when used in conjunction with the buffer bellows 62 and the stabilizing bellows 68, it is possible to achieve low-nitrogen combustion during the ignition stage of the burner 3, and to achieve sufficient and stable supply of air during the subsequent full combustion of the incinerator 4, while also avoiding the problem of large impact of the air flow velocity entering the incinerator 4, thereby affecting the progress of full combustion.

[0041] In addition, in the embodiment of the present application, the air inlet duct 61 is parallel to the tangent direction of the buffer bellows 62, so that the combustion air can enter along the lateral cutting direction of the buffer bellows 62, which helps to smoothly enter the buffer bellows 62 and present a spiral flow path inside the buffer bellows 62, thereby playing a buffering role; a first flange 631 is set between the output end of the buffer bellows 62 and the first ventilation pipe 63 and connected by rivets, which is convenient for rapid disassembly and installation between the two, and also convenient for maintenance of the combustion air component 6; a connecting box body 69 is connected between the buffer bellows 62 and the stabilizing bellows 68, and a second flange 691 is set between the connecting box body 69 and the buffer bellows 62 and connected by rivets, which is convenient for disassembly and installation. At the same time, a through groove is reserved on the outside of the connecting box body 69, which is convenient for setting a driving component to drive the rotating tube 65 to rotate. As for the structure of the driving component, those skilled in the art can reasonably select it according to actual needs. The rotation structure of the driving component driving the rotating tube 65 is also a conventional structure in this field, and those skilled in the art can easily select it.

[0042] Reference Figure 4 , the lengths of the output ends of the second vent pipe 64 and the stabilizing wind box 68 extending into the combustion chamber of the incinerator 4 are different; the output end of the second vent pipe 64 is arranged corresponding to the output end of the tail gas pipe 8, so that the tail gas is ignited here. Specifically, in the embodiment of the present application, the length of the output end of the second vent pipe 64 extending into the combustion chamber of the incinerator 4 is greater than the length of the output end of the stabilizing wind box 68 extending into the combustion chamber of the incinerator 4. The purpose of such a setting is to facilitate the ignition of the transported tail gas here, and at the same time, it is conducive to the subsequent combustion of the tail gas and air outside the ignition area.

[0043] Reference Figure 2-Figure 8, also includes a fuel gas pipeline 7 and an exhaust gas pipeline 8; the first exhaust gas inlet is provided with an exhaust gas pipeline 8, and the input end of the exhaust gas pipeline 8 is connected to the output end of the supercharging device 2; the output end of the exhaust gas pipeline 8 extends into the interior of the second ventilation pipe 64, the output end of the fuel gas pipeline 7 extends into the interior of the second ventilation pipe 64 and the exhaust gas pipeline 8, and extends to the combustion chamber of the incinerator 4, and the input end of the fuel gas pipeline 7 is connected to an external fuel gas source. Specifically, in the embodiment of the present application, the pipe body of the output end of the tail gas pipeline 8 is arranged inside the second vent pipe 64, and at the axis of the second vent pipe 64, so that the tail gas can be surrounded by the air output by the second vent pipe 64 when it is transported to the ignition area, which is convenient for ignition operation. At the same time, a fuel gas pipeline 7 is also arranged, and a purified natural gas is introduced into the natural gas purification plant as a fuel gas, the main component of which is methane CH4. The pipe body of the output end of the fuel gas pipeline 7 is arranged inside the tail gas pipeline 8, and at the axis of the tail gas pipeline 8, so that the fuel gas can be surrounded by the tail gas when it is transported to the ignition area, which further helps ignition. Compared with the prior art that only ignites by colliding a tail gas and a stream of air, the present application has significant progress and can quickly and smoothly perform the ignition work of the burner 3.

[0044] Reference Figure 4-Figure 5 The switching valve core 66 has a first position and a second position; when the switching valve core 66 is in the first position, the outer side of the switching valve core 66 blocks the second air outlet 651, and the first ventilation pipe 63 and the second ventilation pipe 64 are connected through the first air outlet 661; when the switching valve core 66 is in the second position, the first air outlet 661 of the switching valve core 66 is blocked by the blocking block 67, and the second air outlet 651 is opened, and the first ventilation pipe 63 is connected to the inside of the stabilizing bellows 68 through the second air outlet 651. Specifically in the embodiment of the present application, the first position and the second position of the switching valve core 66 are set, which can quickly realize the gas supply requirements for ignition of the burner 3 and the subsequent sufficient combustion of the incinerator 4. As for the driving power source of the rotating tube 65, those skilled in the art can freely choose it. For example, meshing teeth can be set on the outside of the rotating tube 65, and then a motor can be used to drive the gear, and then the gear engages with the meshing teeth, thereby driving the rotating tube 65 to rotate. As for the command to control the motor, the PLC program can be set to perform corresponding control. These are not within the scope of protection of the present application and will not be repeated here.

[0045] Reference Figure 5A fixing plate 641 is fixedly connected to the inner side of the input end of the second ventilation pipe 64, and a blocking block 67 is fixedly connected to the center of the fixing plate 641; a semicircular through groove 642 is opened on the fixing plate 641; a guide rod 663 is arranged between the switching valve core 66 and the fixing plate 641, one end of the guide rod 663 is fixedly connected to the switching valve core 66, and the other end of the guide rod 663 passes through the fixing plate 641 and is slidably connected to the fixing plate 641. Specifically in the embodiment of the present application, in order to prevent the switching valve core 66 from rotating along with the rotating tube 65, a guide rod 663 is provided, and at the same time, the switching valve core 66 can slide stably on the inner side of the rotating tube 65; the semicircular through groove 642 is provided so that when the first air outlet 661 is not blocked by the blocking block 67, air can enter the second ventilation pipe 64 through the first air outlet 661 and the semicircular through groove 642, thereby achieving the air supply requirement for ignition; more specifically, the end of the blocking block 67 can be made into a cone, so that the first air outlet 661 can achieve effective sealing when it abuts against the end of the blocking block 67.

[0046] Reference Figure 2 , Figure 4 , and also includes a plurality of groups of stepped injection assemblies 9 arranged in an annular array at the output end of the stabilizing wind box 68; each group of stepped injection assemblies 9 includes a plurality of nozzles 91 arranged along the radial direction of the stabilizing wind box 68, and the lengths of the plurality of nozzles 91 in each group decrease in sequence. Specifically, in the embodiment of the present application, a stepped injection assembly 9 is arranged at the output end of the stabilizing wind box 68, so that the air output from the stabilizing wind box 68 is dispersedly sprayed out by the plurality of nozzles 91, and the output ends of the plurality of nozzles 91 in the same group are in a stepped shape, so that the air output from the stabilizing wind box 68 is layered and dispersed, which can effectively increase the contact area between the air output from the stabilizing wind box 68 and the exhaust gas entering the incinerator 4, which is conducive to sufficient mixing and ultimately conducive to sufficient combustion.

[0047] Reference Figure 4 , Figure 6 , Figure 7 , the output end of the second ventilation pipe 64 is fixedly connected with a reducing pipe 643, and the reducing pipe 643 is provided with a plurality of negative pressure holes 644 in the radial direction. Specifically, in the embodiment of the present application, the reducing pipe 643 and the negative pressure holes 644 are arranged at the output end of the second ventilation pipe 64, so that during the ignition stage of the burner 3, when the airflow passes through the reducing pipe 643, the cross-sectional area of ​​the airflow becomes smaller, thereby generating a negative pressure at the reducing pipe 643, and then the flue gas generated in the combustion chamber during the ignition process can be re-inhaled into the second ventilation pipe 64 through the negative pressure holes 644, and part of the combustion flue gas is inhaled into the burner 3, mixed with air and burned, so as to realize flue gas recirculation, and the heat capacity of the combustion flue gas is large, and the combustion temperature is reduced, which can further reduce the generation of NOx.

[0048] Reference Fig. 9In the embodiment of the present application, a plurality of second tail gas inlets 41 are provided, and the plurality of second tail gas inlets 41 are arranged in a circular array along the axis of the incinerator 4, and the center line of the second tail gas inlet 41 is tangent to the inner side of the combustion chamber of the incinerator 4. A cooling chamber is also provided inside the incinerator 4, and a plurality of cooling air inlets are provided outside the cooling chamber, and the cooling air is transported by a cooling fan 14. The incinerator 4 is composed of a shell 42, a refractory layer 43, and a thermal insulation layer 44. A combustion chamber and a cooling chamber are provided inside the incinerator 4. The inner cavities of the combustion chamber and the cooling chamber are provided with partition walls with windows, and the partition walls are made of refractory castables. The refractory layer 43 is made of corrosion-resistant and high-temperature-resistant neutral corundum mullite with a thickness of 100 mm; the thermal insulation layer 44 is made of lightweight thermal insulation castable with a thickness of 100 mm; the shell 42 is made of carbon steel with a thickness of 14 mm, which meets the pressure-bearing and high-temperature-resistant requirements of the incinerator 4.

[0049] The present application provides a tail gas treatment process, including:

[0050] The multiple exhaust gas sources are collected through the exhaust gas manifold 12;

[0051] The exhaust gas outputted from the exhaust manifold 12 is subjected to defoaming and defoaming treatment by the defoaming device 1;

[0052] The tail gas after defoaming and foaming treatment is transported to the burner 3 and the incinerator 4 through the booster device 2;

[0053] The external combustion air is delivered to the combustion chamber of the burner 3 and the incinerator 4 through the combustion air component 6, and then mixed with the tail gas delivered to the burner 3 and the incinerator 4 to achieve the ignition and subsequent combustion of the tail gas; the tail gas after combustion in the incinerator 4 is finally discharged through the chimney 5. The ignition of the tail gas also includes the external fuel gas source being introduced into the burner 3, and merging with the tail gas and the combustion air inside the burner 3 to assist the smooth ignition of the tail gas; the tail gas after combustion in the incinerator 4 includes the tail gas after combustion in the combustion chamber of the incinerator 4 and cooling in the cooling chamber of the incinerator 4.

[0054] Conventional burners usually emit NOx between 120 and 150 mg / m 3 The NOx emission of the low nitrogen burner in this application can be controlled at 30~80mg / m 3 The design temperature of the combustion chamber is 650℃-750℃, and the flue gas temperature at the outlet of the combustion chamber of the incinerator 4 is controlled to be 700℃. After mixing with the cooling air at 20℃, the outlet temperature of the cooling chamber reaches the design temperature of 200℃. The required cooling air volume is calculated through heat balance.

[0055] This application specifically provides a method for calculating the power of the incinerator 4 and the total flue gas volume of the combustion chamber. The power of the incinerator 4 and the total flue gas volume of the combustion chamber can be calculated by the amount of combustible components in the tail gas, the amount of fuel gas and the corresponding calorific value. Through this calculation, the gas volume value required in each process of the operation of the entire system can be accurately determined, and the cost of the overall system operation can be further reduced. The specific calculation method is as follows:

[0056] (1) Calculation of combustion of combustible gas components

[0057] The combustible components in the tail gas include hydrogen sulfide, methane, ethane and hexane. The theoretical amount of oxygen required for the complete combustion reaction of each component is calculated ①, which is used to determine the power of the combustion-supporting fan 13.

[0058] (2) Fuel gas combustion calculation

[0059] CH4 is used as the fuel gas. The design temperature of the furnace after combustion, that is, the flue gas temperature, reaches 700℃. The amount of fuel gas CH4 required for complete combustion of the tail gas (acid gas) is calculated through heat balance②.

[0060] (3) Incinerator 4 power and total flue gas volume

[0061] Through the amount of combustible components in the exhaust gas, the amount of fuel gas and the corresponding calorific value, the power of the incinerator 4 can be calculated as ③, which is used to determine the power size of the incinerator 4 and the power size of the burner 3. In addition, the volume size of the incinerator 4 can be calculated through the power size of the incinerator 4 and the amount of processed exhaust gas.

[0062] (4) Cooling air volume

[0063] The design flue gas temperature at the chimney 5 outlet is 200℃, and the flue gas temperature at the incinerator 4 combustion chamber outlet is 700℃. After mixing with the cooling air at 20℃, the chimney 5 outlet temperature reaches the design temperature. Through heat balance calculation, the required cooling air volume ④ when the furnace temperature is 700℃, after the cooling air volume is determined, the power of the cooling fan 14 can be determined.

[0064] (5) Flue gas volume at the outlet of incinerator 4

[0065] The amount of tail gas discharged into the atmosphere from chimney 5 includes SO2, NO x , N2, CO2, O2, H2O. The total amount of flue gas produced by each component is summarized to determine the size of chimney 5. Through heat balance calculation and material balance calculation, it is concluded that the amount of flue gas produced by the combustion of combustible components of tail gas is ⑤, the amount of oxygen remaining in the tail gas components is ⑥, and the amount of non-combustible components in the tail gas is ⑦. Therefore, the total flue gas volume in the combustion chamber is the sum of ⑤+⑥+⑦+④.

[0066] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0067] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A tail gas treatment system, characterized in that: It comprises a defoaming device (1), a pressure-boosting device (2), a burner (3), an incinerator (4) and a chimney (5); The input end of the defoaming device (1) is connected to a tail gas source, and can perform defoaming and defoaming treatment on the tail gas; The burner (3) and the incinerator (4) are respectively provided with a first tail gas inlet and a second tail gas inlet (41); The input end of the boosting device (2) is connected to the output end of the defoaming device (1), and the output end of the boosting device (2) is respectively connected to the first tail gas inlet and the second tail gas inlet (41), so that the tail gas after defoaming and defoaming treatment can be transported to the burner (3) and the incinerator (4) respectively; A combustion-supporting air component (6) is arranged inside the burner (3); an input end of the combustion-supporting air component (6) is connected to an external air source, and an output end of the combustion-supporting air component (6) extends into the burner (3) and the incinerator (4); The rear end of the burner (3) extends into the combustion chamber of the incinerator (4); The combustion-supporting air component (6) comprises an air inlet pipe (61), a buffer bellows (62), a first ventilation pipe (63), a second ventilation pipe (64), a rotating pipe (65), a switching valve core (66), a blocking block (67), and a stabilizing bellows (68); The output end of the air inlet duct (61) is in communication with the interior of the buffer bellows (62), and the output end of the buffer bellows (62) is in communication with the input end of the first ventilation pipe (63); The rotating tube (65) is sleeved on the outer side of the first ventilation tube (63) and is rotatably connected to the outer side of the first ventilation tube (63); The switching valve core (66) is arranged between the first ventilation pipe (63) and the second ventilation pipe (64), and is slidably and sealingly connected to the inner side of the rotating pipe (65); The switching valve core (66) is provided with a first air outlet (661) at an end portion close to the second ventilation pipe (64), a second air outlet (651) is provided on the outer side of the rotating pipe (65), and the blocking block (67) is arranged on the inner side of the input end of the second ventilation pipe (64); The input end of the second ventilation pipe (64) is in communication with the output end of the rotating pipe (65), and the input end of the second ventilation pipe (64) and the output end of the rotating pipe (65) are in a rotating sealed connection; The outer side of the switching valve core (66) is provided with a spiral groove (662), the inner side of the rotating tube (65) is fixedly connected with a protrusion (652), and the protrusion (652) is slidably matched with the spiral groove (662); The rotating tube (65) can drive the switching valve core (66) to slide along the length direction of the rotating tube (65), so that the first air outlet (661) is closed or opened, and the second air outlet (651) is opened or closed; The stabilizing bellows (68) is sleeved on the outside of the rotating tube (65), and the output end of the stabilizing bellows (68) and the output end of the second ventilation pipe (64) both extend into the combustion chamber of the incinerator (4).

2. The exhaust gas treatment system according to claim 1, characterized in that: The output ends of the second ventilation pipe (64) and the stabilizing wind box (68) extend into the combustion chamber of the incinerator (4) at different lengths.

3. The exhaust gas treatment system according to claim 1, characterized in that: It also includes a fuel gas pipeline (7) and an exhaust gas pipeline (8); The first exhaust gas inlet is provided with the exhaust gas pipeline (8), and the input end of the exhaust gas pipeline (8) is connected to the output end of the supercharging device (2); The output end of the tail gas pipeline (8) extends into the interior of the second ventilation pipe (64), the output end of the fuel gas pipeline (7) extends into the interior of the second ventilation pipe (64) and the tail gas pipeline (8), and extends to the combustion chamber of the incinerator (4), and the input end of the fuel gas pipeline (7) is connected to an external fuel gas source.

4. The exhaust gas treatment system according to claim 1, characterized in that: The switching valve core (66) has a first position and a second position; When the switching valve core (66) is in the first position, the outer side of the switching valve core (66) blocks the second air outlet (651), and the first ventilation pipe (63) and the second ventilation pipe (64) are connected through the first air outlet (661); When the switching valve core (66) is in the second position, the first air outlet (661) of the switching valve core (66) is blocked by the blocking block (67), while the second air outlet (651) is opened, and the first ventilation pipe (63) is connected to the interior of the stabilizing bellows (68) through the second air outlet (651).

5. The exhaust gas treatment system according to claim 1, characterized in that: A fixing plate (641) is fixedly connected to the inner side of the input end of the second ventilation pipe (64), and the center of the fixing plate (641) is fixedly connected to the blocking block (67); The fixing plate (641) is provided with a semicircular through groove (642); A guide rod (663) is provided between the switching valve core (66) and the fixed plate (641), one end of the guide rod (663) being fixedly connected to the switching valve core (66), and the other end of the guide rod (663) passing through the fixed plate (641) and being slidably connected to the fixed plate (641).

6. The exhaust gas treatment system according to claim 1, characterized in that: It also includes a plurality of stepped injection assemblies (9) arranged in an annular array at the output end of the stabilizing bellows (68); Each group of the stepped injection assemblies (9) comprises a plurality of nozzles (91) arranged along the radial direction of the stabilizing wind box (68), and the lengths of the plurality of nozzles (91) in each group decrease in sequence.

7. The exhaust gas treatment system according to claim 1, characterized in that: The output end of the second ventilation pipe (64) is fixedly connected to a reducing pipe (643), and the reducing pipe (643) is provided with a plurality of negative pressure holes (644) along the radial direction.

8. A tail gas treatment process, based on the tail gas treatment system according to claim 1, characterized in that: include: The multiple exhaust gas sources are collected through an exhaust gas manifold (12); The exhaust gas output from the exhaust manifold (12) is subjected to defoaming and defoaming treatment by means of a defoaming device (1); The exhaust gas after defoaming and foam removal is transported to the burner (3) and the incinerator (4) through the booster device (2); The external combustion air is delivered to the combustion chamber of the burner (3) and the incinerator (4) through the combustion air component (6), and then mixed with the exhaust gas delivered to the burner (3) and the incinerator (4), so as to achieve ignition and subsequent combustion of the exhaust gas; The exhaust gas after combustion in the incinerator (4) is finally discharged through the chimney (5).

9. The tail gas treatment process according to claim 8, characterized in that: The ignition of the exhaust gas further comprises introducing an external fuel gas source into the burner (3) and combining the fuel gas with the exhaust gas and combustion-supporting air inside the burner (3) to assist in the smooth ignition of the exhaust gas; The tail gas after combustion in the incinerator (4) includes tail gas after combustion in the combustion chamber of the incinerator (4) and after cooling in the cooling chamber of the incinerator (4).

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