CN117739350A - Sulfur recovery tail gas incineration equipment and tail gas treatment method - Google Patents

Abstract

The application discloses sulfur recovery tail gas incineration equipment and a tail gas treatment method, which belong to the technical field of tail gas treatment and comprise a combustor, wherein the combustor comprises a shell and a gas pipe, a first air cavity, a second air cavity and a combustion cavity are arranged in the shell, the gas pipe is provided with a gas channel, the first air cavity and the second air cavity are mutually separated, the shell is respectively provided with a first air inlet and a second air inlet, the first air cavity, the second air cavity and the gas channel are respectively communicated with the combustion cavity, at least part of the gas pipe is positioned in the first air cavity, and at least part of the gas pipe is provided with a first gas spray hole communicated with the gas channel and the first air cavity; the furnace body is provided with a furnace chamber, the furnace body is connected with the shell, the furnace chamber is communicated with the combustion chamber, the furnace body is provided with a third air inlet and an exhaust gas inlet, and the third air inlet and the exhaust gas inlet are respectively communicated with the furnace chamber. The temperature of the furnace chamber is controlled through the premixing of part of air and fuel gas and the matching of the multi-stage air, so that the combustion efficiency of waste gas is ensured, and the generation and the emission of pollutants are reduced.

Description

Sulfur recovery tail gas incineration equipment and tail gas treatment method

Technical Field

The application belongs to the technical field of tail gas treatment, and particularly relates to sulfur recovery tail gas incineration equipment and a tail gas treatment method.

Background

At present, in industries such as petroleum refining, chemical production, coal deep processing and the like, a production process for recycling sulfur exists, and tail gas generated in the sulfur recycling production process contains toxic components such as hydrogen, elemental sulfur, a small amount of hydrocarbons, trace hydrogen sulfide and the like.

The tail gas generated in the sulfur recovery process is usually required to be burnt and oxidized in the furnace and then discharged by adopting a tail gas incinerator, and along with the increasingly strict environmental requirements, many petrochemical plants put forward lower discharge index requirements on the sulfur recovery tail gas incinerator, for example, the volatile organic compound (Volatile Organic Compounds, VOC) waste gas discharged by devices such as a sulfur-containing storage tank, a liquid pool and the like is also sent into the incinerator for incineration treatment, so that Nitrogen Oxides (NO) at the outlet of the tail gas incinerator _X ) Emission control difficulties such as Non-methane total hydrocarbons (Non-methane Hydrocarbon, abbreviated as NMHC) are increased.

Disclosure of Invention

The invention aims to: the embodiment of the application provides sulfur recovery tail gas incineration equipment, which aims to solve the technical problems; another object of the present application is to provide a method for treating exhaust gas and an apparatus for incinerating exhaust gas using the same.

The technical scheme is as follows: the embodiment of the application provides a sulfur recovery tail gas incineration equipment, includes:

the burner comprises a shell and a gas pipe connected with the shell, wherein a first air cavity, a second air cavity and a combustion cavity are arranged in the shell, the gas pipe is provided with a gas channel, the first air cavity and the second air cavity are mutually separated, the shell is respectively provided with a first air inlet communicated with the first air cavity and a second air inlet communicated with the second air cavity, the first air cavity, the second air cavity and the gas channel are respectively communicated with the combustion cavity, at least part of the gas pipe is positioned in the first air cavity, and at least part of the gas pipe is provided with a first gas spray hole communicated with the gas channel and the first air cavity;

the furnace body, the casing is connected to the furnace body, the furnace body has the furnace chamber, just the furnace chamber intercommunication the burning chamber, the furnace body is equipped with third air inlet and waste gas import, just third air inlet with waste gas import communicates respectively the furnace chamber.

In some embodiments, the sulfur recovery tail gas incineration device has a central axis;

the burner further comprises an air swirl element which is arranged in the first air cavity, and the air swirl element is arranged around the central axis so as to convey air towards the combustion cavity in a spiral manner along the extending direction of the central axis;

at least part of the gas pipe penetrates through the first air cavity along the central axis, and the first gas spray hole is positioned on one side of the air swirl element, which faces the combustion cavity.

In some embodiments, the second air chamber is arranged outside the gas channel around the central axis in a ring manner, a refractory lining is arranged in the shell, the refractory lining surrounds the combustion chamber around the central axis, and the refractory lining is provided with air spray holes communicated with the second air chamber and the combustion chamber;

the burner further comprises an ignition piece, the refractory lining is positioned between the first air cavity and the combustion cavity to form a mixing cavity, the first air cavity and the combustion cavity are communicated through the mixing cavity, and the ignition piece is provided with an ignition part which is telescopically arranged in the mixing cavity;

the air spray holes are arranged in a plurality, and the air spray holes are arranged outside the mixing cavity around the central axis in a ring mode;

and/or, the extending direction of the air spray holes is parallel to the extending direction of the central axis.

In some embodiments, at least part of the gas pipe comprises a delivery pipe section and a gas outlet pipe section connected to each other, the gas outlet pipe section being located at an end of the delivery pipe section facing the combustion chamber;

the first gas spray holes are arranged in a plurality, and the first gas spray holes are circumferentially arranged on the gas outlet pipe section around the central axis;

the air outlet pipe section is provided with an end wall facing the combustion chamber, and a second gas spraying hole is formed in the end wall.

In some embodiments, the jet direction of the first gas jet hole is inclined towards the combustion chamber, and an included angle a is formed between the jet direction of the first gas jet hole and the central axis, so that 60 degrees or more and more are satisfied, and a is not less than 30 degrees.

In some embodiments, the second gas injection holes are multiple, the multiple second gas injection holes comprise multiple second gas straight injection holes and multiple second gas inclined injection holes, the multiple second gas straight injection holes are circumferentially arranged around the central axis, and the multiple second gas inclined injection holes are circumferentially arranged outside the second gas straight injection holes around the central axis;

the extending direction of the second fuel gas straight spray hole is parallel to the extending direction of the central axis;

and/or the jet direction of the second gas inclined jet hole is inclined towards the combustion chamber, and an included angle b is formed between the jet direction of the second gas inclined jet hole and the central axis, so that the angle b is more than or equal to 60 degrees and more than or equal to 30 degrees.

In some embodiments, the total open area of the first gas injection orifice and the second gas injection orifice is S;

wherein the total area of the openings of the first gas spray holes is A, and the ratio of A/S to S is more than or equal to 0.8 and more than or equal to 0.7;

and/or the total area of the openings of the second fuel gas straight spray holes is B, and the total area of the openings is more than or equal to 0.15 and more than or equal to 0.1.

In some embodiments, the burner further comprises an air tube communicating with the second air inlet and a branch tube communicating with the third air inlet, and the branch tube is provided with a flow regulating valve.

In some embodiments, the exhaust gas inlet comprises a first exhaust gas inlet for introducing VOC exhaust gas and a second exhaust gas inlet for introducing sulfur recovery tail gas, the first exhaust gas inlet being located on a side of the second exhaust gas inlet facing the combustion chamber.

In some embodiments, the second exhaust gas inlet is provided with a plurality of;

a plurality of said second exhaust inlets disposed about said central axis;

and/or, the distance between any two second exhaust gas inlets around the central axis is less than or equal to 180 degrees, and the sulfur recovery tail gas incineration equipment further comprises an exhaust gas distribution shell, wherein the exhaust gas distribution shell is connected with the furnace body, the exhaust gas distribution shell is provided with a distribution cavity for guiding sulfur recovery tail gas, the distribution cavity extends around the central axis and is communicated with each second exhaust gas inlet, and the extension range of the distribution cavity around the central axis is less than or equal to 180 degrees.

In some embodiments, the exhaust gas inlet is used for supplying gas towards one side away from the combustion chamber, and an included angle c is formed between the gas supplying direction of the exhaust gas inlet and the extending direction of the central axis, so that the angle c is more than or equal to 90 degrees and more than or equal to 45 degrees;

and/or the third air inlet is used for feeding air towards one side deviating from the combustion chamber, and an included angle d is formed between the air feeding direction of the third air inlet and the extending direction of the central axis, so that the angle d is more than or equal to 90 degrees and more than or equal to 45 degrees.

Correspondingly, the tail gas treatment method disclosed by the embodiment of the application is applied to the tail gas incineration equipment and comprises the following steps of:

air is respectively introduced into the first air inlet, the second air inlet and the third air inlet, fuel gas is introduced into the fuel gas channel, and the fuel gas and the air are sequentially mixed in the first air cavity and the combustion cavity to form mixed gas;

igniting the mixed gas formed by air and fuel gas in the combustion cavity;

introducing waste gas into the waste gas inlet to mix with the combusted mixed gas for combustion;

and the burnt waste gas is discharged from the furnace body.

In some embodiments, the single air charge of the first air inlet is 70% to 80% of the air required for equivalent combustion of the gas charge in the single gas channel;

and/or, the ratio of the single air inlet amount of the third air inlet to the sum of the single air inlet amounts of the second air inlet and the third air inlet is less than or equal to 8%.

In some embodiments, the air delivery rate of the second air chamber toward the combustion chamber is 80m/s or greater;

and/or the gas conveying speed of the gas channel towards the first air cavity and/or the combustion cavity is greater than 150m/s.

The beneficial effects are that: according to the embodiment of the application, the air is respectively led into the first air inlet, the second air inlet and the third air inlet, the fuel gas is led into the fuel gas channel, part of the fuel gas can be premixed with the air in the first air chamber through the first fuel gas spray hole and is led to the combustion chamber, the mixing effect of the fuel gas and the air before combustion in the combustion chamber is improved, the risk of tempering the combustion chamber towards the side of the fuel gas channel is reduced, the air in the first air chamber and the fuel gas are combusted in advance in the combustion chamber, the air in the second air chamber is supplemented into the combustion chamber, the fuel gas generated by the mixed combustion of the air in the first air chamber and the fuel gas is further mixed with the flow velocity of the mixed gas, the temperature in the combustion chamber is improved, the temperature in the combustion chamber is reduced, the generation and emission of pollutants such as nitrogen oxides are reduced, and further, the harmful substances such as hydrocarbon in the combustion gas are combusted and the waste gas are combusted after the waste gas is led into the furnace chamber through the waste gas inlet, the waste gas is combusted and the harmful substances in the furnace chamber, the waste gas treatment is realized, and the temperature of the combustion of the waste gas can be regulated while the waste gas is combusted in the furnace chamber, the waste gas is combusted, and the pollutant such as the nitrogen oxides are reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a burner according to an embodiment of the present application;

FIG. 2 is a schematic view of the structure of the combustor interior according to an embodiment of the present application;

FIG. 3 is a schematic view of the structure of an outlet pipe section according to an embodiment of the present application;

FIG. 4 is a schematic view of the structure of an end wall of an embodiment of the present application;

FIG. 5 is a schematic view of a refractory lining according to an embodiment of the present application;

FIG. 6 is a schematic view of a furnace body and a furnace chamber according to an embodiment of the present application;

FIG. 7 is a schematic view of the structure of an exhaust gas distribution housing according to an embodiment of the present application;

reference numerals: 1. a burner; 10. a housing; 100. a first air chamber; 101. a second air chamber; 103. a combustion chamber; 104. a first air inlet; 105. a second air inlet; 106. a mixing chamber; 11. a gas pipe; 110. a gas passage; 111. a first gas injection hole; 112. conveying pipe sections; 113. an air outlet pipe section; 1130. an end wall; 1131. a through hole; 114. a second gas injection hole; 1140. the second fuel gas straight jet hole; 1141. the second fuel gas inclined spray hole; 115. a gas inlet; 12. an air swirl member; 13. a refractory lining; 130. an air jet orifice; 131. a laryngeal opening; 132. an expansion section; 14. an ignition member; 140. an ignition section; 15. an air tube; 16. a branch flow pipe; 160. a flow regulating valve; 17. an air uniform distribution plate; 18. a flame detection unit; 19. a partition plate; 2. a furnace body; 20. a cavity; 21. a third air inlet; 22. an exhaust gas inlet; 220. a first exhaust gas inlet; 221. a second exhaust gas inlet; 3. an exhaust gas distribution housing; 30. a dispensing chamber; 31. a shunt; 4. a central axis.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

In the description of the present application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, and at least one means may be one, two or more, unless explicitly defined otherwise.

The applicant notes that in the industries of petroleum refining, chemical production, coal deep processing and the like, the production process for recycling sulfur exists at present, and the tail gas generated in the sulfur recycling production process contains toxic components such as hydrogen, sulfur, a small amount of hydrocarbons, trace hydrogen sulfide and the like. Therefore, it is necessary to incinerate and oxidize the exhaust gas generated in the sulfur recovery process by an exhaust gas incineration apparatus and then discharge the same. Along with the increasingly strict environmental protection requirements, many petrochemical plants put forward lower emission index requirements on sulfur recovery tail gas incineration, and volatile organic compound waste gas (VOC) discharged by devices such as a sulfur-containing storage tank, a liquid pool and the like is also sent into incineration equipment, so that the emission control difficulty of pollutants such as non-methane total hydrocarbons (NMHC) and nitrogen oxides at the discharge port of the incineration equipment is improved, for example: the aim is to reduce the emission of nitrogen oxides to reduce the temperature of the incineration equipment, so that hydrocarbon substances are discharged out of the incineration equipment without being completely combusted, and the emission of non-methane total hydrocarbons is increased.

In view of the above, the present embodiments disclose a sulfur recovery tail gas incineration apparatus capable of solving at least one of the above-described drawbacks.

Referring to fig. 1 to 7, a sulfur recovery tail gas incineration apparatus comprises a burner 1 and a furnace body 2, wherein the burner 1 comprises a housing 10 and a gas pipe 11 connected with the housing 10, the housing 10 is internally provided with a first gas cavity 100, a second gas cavity 101 and a combustion cavity 103, the gas pipe 11 is provided with a gas channel 110, the first gas cavity 100 and the second gas cavity 101 are mutually separated, the housing 10 is respectively provided with a first air inlet 104 communicated with the first gas cavity 100 and a second air inlet 105 communicated with the second gas cavity 101, the first gas cavity 100, the second gas cavity 101 and the gas channel 110 are respectively communicated with the combustion cavity 103, at least part of the gas pipe 11 is positioned in the first gas cavity 100, and at least part of the gas pipe 11 is provided with a first gas spray hole 111 communicated with the gas channel 110 and the first gas cavity 100; the furnace body 2 is connected with the shell 10, the furnace body 2 is provided with a furnace chamber 20 communicated with the combustion chamber 103, the furnace body 2 is provided with a third air inlet 21 and an exhaust gas inlet 22, and the third air inlet 21 and the exhaust gas inlet 22 are respectively communicated with the furnace chamber 20.

By introducing air into the first air inlet 104, the second air inlet 105 and the third air inlet 21 respectively, introducing fuel gas into the fuel gas channel 110, part of the fuel gas can be premixed with the air in the first air cavity 100 through the first fuel gas spray holes 111 and continuously guided to the combustion cavity 103, so that the mixing effect of the fuel gas and the air before the combustion of the combustion cavity 103 is improved, and the risk of tempering of the combustion cavity 103 towards the fuel gas channel 110 side is reduced;

it can be understood that the air and gas mixture of the first air cavity 100 is pre-combusted in the combustion cavity 103, and the air of the second air cavity 101 is directly fed into the combustion cavity 103 to be further mixed with the flue gas generated by mixing and combusting the air and the gas in the combustion cavity 103, so that the flow rate of the mixed gas in the combustion cavity 103 is improved, the temperature in the combustion cavity 103 is facilitated to be more uniform, and the temperature in the combustion cavity 103 is reduced, thereby reducing the generation and emission of pollutants such as nitrogen oxides;

further, by introducing the exhaust gas into the furnace chamber 20 through the exhaust gas inlet 22, it can be understood that the exhaust gas can be VOC exhaust gas or exhaust gas generated by sulfur recovery, and the flue gas generated by combustion in the combustion chamber 103 is introduced into the furnace chamber 20 and then mixed with the exhaust gas for combustion, so as to burn and oxidize hydrocarbon and other harmful substances in the exhaust gas, thereby being beneficial to reducing the emission of hydrocarbon harmful substances;

in addition, the gas introduced by the third air inlet 21 enters the furnace chamber 20 to assist the combustion of the exhaust gas, and simultaneously can adjust the temperature of the combustion flue gas, thereby reducing the generation and emission of pollutants such as nitrogen oxides;

partial premixing of air and fuel gas and the combustion chamber 103 and the furnace chamber 20 are led in the air classification mode, the temperature of the combustion chamber 103 is promoted to be more uniform, the temperature of the combustion chamber 103 is reduced, emission of nitrogen oxides is reduced, and the emission of pollutants can be effectively controlled while ensuring the combustion efficiency by adjusting air inlets of the first air inlet 104, the second air inlet 105 and the third air inlet 21.

Specifically, in some embodiments, referring to fig. 2, the sulfur recovery tail gas incinerator has a central axis 4, and it should be noted that, in this embodiment, the burner 1 and the furnace body 2 are concentrically arranged along the central axis 4. The burner 1 further comprises an air swirler 12, the air swirler 12 being arranged in the first air chamber 100 and extending towards the combustion chamber 103, the first air inlet 104 being directed towards the air swirler 12, the air swirler 12 being arranged around the central axis 4 for helically conveying air towards the combustion chamber 103 in the direction of extension of the central axis 4.

It should be noted that, in this embodiment, the air cyclone flow member 12 may be a centrifugal air cyclone, that is, a cylinder with built-in cyclone blades, and the air and the gas are mixed at a high speed under the action of the cyclone flow by sucking the gas by the cyclone blades when the cylinder rotates at a high speed.

In addition, in order to further uniformly distribute the space introduced into the first air chamber 100 within the first air chamber 100, referring to fig. 2, a plurality of air uniform distribution plates 17 are further provided within the first air chamber 100, the plurality of air uniform distribution plates 17 are sequentially uniformly distributed around the central axis 4 and connected to the inner wall of the housing 10, and the air uniform distribution plates 17 extend along the extending direction of the central axis 4.

In some embodiments, referring to fig. 1 and 2, at least a portion of the gas pipe 11 extends through the first air chamber 100 along the central axis 4, and the first gas injection holes 111 are located on a side of the air swirler 12 that faces the combustion chamber 103. The gas pipe 11 in this embodiment penetrates the housing 10 from the end of the housing 10 facing away from the furnace body 2 and extends in the direction of the central axis 4.

Specifically, in some embodiments, referring to fig. 2 to 4, at least a portion of the gas pipe 11 includes a conveying pipe section 112 and a gas outlet pipe section 113 that are connected to each other, in this embodiment, the conveying pipe section 112 penetrates into the first air chamber 100 from an end of the housing 10 facing away from the furnace body 2, and the gas outlet pipe section 113 is located at an end of the conveying pipe section 112 facing the combustion chamber 103; the delivery pipe section 112 is provided with a gas inlet 115 on the outside of the housing 10.

Referring to fig. 3, a plurality of first gas injection holes 111 are provided, and the plurality of first gas injection holes 111 are circumferentially disposed on the gas outlet pipe section 113 around the central axis 4, in this embodiment, the first gas injection holes 111 are disposed in two circles on the gas outlet pipe section 113, and the two circles of first gas injection holes 111 are disposed in a staggered manner.

Further, in some embodiments, referring to fig. 2 and 3, the injection direction of the first gas injection hole 111 is inclined toward the combustion chamber 103, and an included angle a is formed between the injection direction of the first gas injection hole 111 and the central axis 4, which satisfies 60 ° Σa being equal to or greater than 30 °, a may be any one of or any two of 30 °, 31 °, 32 °, 33 °, 34 °, 35 °, 36 °, 37 °, 38 °, 39 °, 40 °, 41 °, 42 °, 43 °, 44 °, 45 °, 46 °, 47 °, 48 °, 49 °, 50 °, 51 °, 52 °, 53 °, 54 °, 55 °, 56 °, 57 °, 58 °, 59 °, and 60 °. The air of the first air chamber 100 intended to cooperate with the screw conveyance is thoroughly mixed.

Further, referring to fig. 2 and 4, the outlet pipe section 113 has an end wall 1130 facing the combustion chamber 103, and the end wall 1130 is provided with the second gas injection holes 114.

Further, in some embodiments, referring to fig. 4, the second gas injection holes 114 are provided in a plurality, the plurality of second gas injection holes 114 include a plurality of second gas straight injection holes 1140 and a plurality of second gas inclined injection holes 1141, in this embodiment, the plurality of second gas straight injection holes 1140 and the plurality of second gas inclined injection holes 1141 are respectively disposed in a circle around the central axis 4, and the plurality of second gas inclined injection holes 1141 are disposed outside the second gas straight injection holes 1140;

wherein, the extending direction of the second fuel gas straight jet hole 1140 is parallel to the extending direction of the central axis 4;

meanwhile, in some embodiments, referring to fig. 3 and 4, the air injection direction of the second fuel gas inclined jet hole 1141 is inclined toward the combustion chamber 103, the second fuel gas inclined jet hole 1141 is inclined toward a direction away from the second fuel gas straight jet hole 1140, and an included angle b is formed between the air injection direction of the second fuel gas inclined jet hole 1141 and the central axis 4, which satisfies 60 ° Σ, b, which may be any one of 30 °, 31 °, 32 °, 33 °, 34 °, 35 °, 36 °, 37 °, 38 °, 39 °, 40 °, 41 °, 42 °, 43 °, 44 °, 45 °, 46 °, 47 °, 48 °, 49 °, 50 °, 51 °, 52 °, 53 °, 54 °, 55 °, 56 °, 57 °, 58 °, 59 °, 60 °, or any two of the range values. The air of the first air chamber 100 intended to cooperate with the screw conveyance is thoroughly mixed. In other embodiments, the second straight fuel gas injection hole 1140 and the second inclined fuel gas injection hole 1141 may be configured as one of the above, or may be configured to deliver fuel gas to the combustion chamber 103.

Further, in some embodiments, referring to FIGS. 3 and 4, the total area of the openings of the first gas injection orifices 111 and the second gas injection orifices 114 is S, wherein the total area of the openings of the first gas injection orifices 111 is A, satisfying 0.8A/S0.7, where A/S may be any one or any two of 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8.

Further, in some embodiments, the total area of the openings of the second straight gas injection holes 1140 is B, which satisfies that B/S is greater than or equal to 0.15 and greater than or equal to 0.1, and B/S may be any one or any two of 0.1, 0.11, 0.12, 0.13, 0.14, and 0.15. In other embodiments, the ratio of the open areas of the first gas nozzle 111 and the second gas straight nozzle 1140 to the total open area may be only one of the above-mentioned settings, or the ratio may be enough to enable most of the gas to mix with air in the first air chamber 100, ensure the mixing effect of the gas and air, and reduce the risk of backfire of the combustion chamber 103 towards the gas channel 110.

In some embodiments, referring to fig. 2, the second air chamber 101 is disposed around the central axis 4 outside the gas channel 110, the first air chamber 100 and the second air chamber 101 in the housing 10 are separated by a partition 19, the air cyclone member 12 is fixed on the partition 19 and extends towards the combustion chamber 103, in this embodiment, the first air chamber 100 includes a portion of the air cyclone member 12 extending towards the combustion chamber 103 through the partition 19, so that the second air chamber 101 is also disposed around the outside of the first air chamber 100 on the side of the air cyclone member 12 towards the combustion chamber 103.

Referring to fig. 2 and 5, a refractory lining 13 is arranged in the shell 10, the refractory lining 13 surrounds the central axis 4 to form a combustion chamber 103, and the refractory lining 13 is provided with air spray holes 130 which are communicated with the second air chamber 101 and the combustion chamber 103;

furthermore, the burner 1 comprises an ignition element 14, which ignition element 14 penetrates the gas pipe 11 from the end of the gas pipe 11 facing away from the combustion chamber 103, and extends along the gas channel 110 to the combustion chamber 103. It will be appreciated that the end wall 1130 is also provided with a through hole 1131 for the ignition member 14 to pass through.

Referring to fig. 2 and 5, the refractory lining 13 is located between the first air chamber 100 and the combustion chamber 103, and a mixing chamber 106 is enclosed between the first air chamber 100 and the combustion chamber 103, where the first air chamber 100 and the combustion chamber 103 are communicated through the mixing chamber 106, in this embodiment, the mixing chamber 106 may be regarded as a part of the combustion chamber 103 where mixed air enters and ignites, the ignition element 14 has an ignition portion 140 that is telescopically arranged in the mixing chamber 106, in this embodiment, the ignition element 14 may be a conventional electric ignition device, an electric spark end thereof is the ignition portion 140, and the integral ignition element 14 may use a telescopic rod structure to control a position of the ignition portion 140 in the mixing chamber 106, so as to flexibly adjust an ignition position.

The mixing chamber 106 formed by the refractory lining 13 comprises a throat 131 connecting the first air chamber 100 and the gas channel 110 and an expansion section 132 connecting the throat 131, both forming a flared structure which expands towards the combustion chamber 103, the ratio of the extension of the expansion section 132 along the central axis 4 to the diameter of the throat 131 being preferably between 1.05 and 1.2.

In addition, a flame detecting portion 18 facing the ignition portion 140 is further provided in the combustion chamber 103, and the combustion flame at the ignition portion 140 can be detected in real time by the flame detecting portion 18 to determine the stability of the flame at the location.

In addition, referring to fig. 2 and 5, a plurality of air jet holes 130 are provided, and the plurality of air jet holes 130 are disposed around the central axis 4 outside the mixing chamber 106. In this embodiment, the number of air holes 130 is not less than 12, and the distance from the mixing chamber 106 is not more than twice the diameter of the air holes 130, i.e. the air holes 130 are ensured to be as close to the path of the gas flow as possible, so as to fully mix and burn.

Meanwhile, the extending direction of the air spray holes 130 is parallel to the extending direction of the central axis 4, so as to uniformly convey the air in the second air cavity 101 to the combustion cavity 103, and realize the fully mixed combustion of the mixed gas formed by the gas and the air in the first air cavity 100. In other embodiments, the arrangement and extending direction of the plurality of air nozzles 130 may be only one of those or the air delivering the second air chamber 101 into the combustion chamber 103 may be realized.

In some embodiments, referring to fig. 6, the combustor 1 further includes an air pipe 15 and a branch pipe 16 communicating with the air pipe 15, the air pipe 15 communicates with the second air inlet 105, the branch pipe 16 communicates with the third air inlet 21, and the branch pipe 16 is provided with a flow regulating valve 160. That is, the second air inlet 105 delivers air into the second air chamber 101 through the air pipe 15, and the branch pipe 16 branches part of the air taken in from the second air inlet 105 to the third air inlet 21 and directly inputs the air into the cavity 20, and the amount of the air branched from the second air inlet 105 to the third air inlet 21 can be controlled through the flow regulating valve 160 as required.

In some embodiments, to better control the temperature within the furnace chamber 20 and reduce the formation of NMHC and nitrogen oxides, referring to fig. 6, the exhaust inlet 22 comprises a first exhaust inlet 220 for introducing VOC exhaust gas and a second exhaust inlet 221 for introducing sulfur recovery exhaust gas, the first exhaust inlet 220 being located on a side of the second exhaust inlet 221 facing the combustion chamber 103. In this embodiment, VOC exhaust gas discharged from the top of the sulfur recovery device or the sulfur pool with a higher heat value may be introduced into the furnace chamber 20 through the first exhaust gas inlet 220, and mixed with the high-temperature flue gas introduced from the combustion chamber 103, then the exhaust gas from the sulfur recovery process with a lower heat value is introduced into the furnace chamber 20 through the second exhaust gas inlet 221, and mixed with the upstream flue gas again for combustion, the third air inlet 21 is disposed between the first exhaust gas inlet 220 and the second exhaust gas inlet 221, the third air inlet 21 can cool the furnace chamber 20 through air, the mixed flue gas is combusted again, the temperature of the finally discharged gas from the furnace chamber 20 is controlled to be not higher than 850 ℃, and the oxygen molar concentration is not lower than 3%.

In some embodiments, referring to fig. 6 and 7, the second exhaust gas inlet 221 is provided in plurality, the plurality of second exhaust gas inlets 221 are disposed around the central axis 4, the distance between any two second exhaust gas inlets 221 around the central axis 4 is 180 ° or less, the sulfur recovery exhaust gas incineration apparatus further comprises an exhaust gas distribution housing 3, the exhaust gas distribution housing 3 is connected to the furnace body 2, the exhaust gas distribution housing 3 has a distribution chamber 30 for introducing sulfur recovery exhaust gas, the distribution chamber 30 extends around the central axis 4 and the exhaust gas distribution housing 3 is provided with a shunt tube 31 correspondingly communicating with each second exhaust gas inlet 221, and the extension range of the distribution chamber 30 around the central axis 4 is 180 ° or less. The exhaust gas distribution shell 3 is beneficial to uniformly distributing the exhaust gas into the furnace chamber 20, so that the mixing effect of the exhaust gas and the flue gas in the furnace chamber 20 is improved.

In this embodiment, taking the interval between the two exhaust gas inlets 22 with the largest interval around the central axis 4 as 180 ° and the interval between the two ends of the distribution chamber 30 extending around the central axis 4 as 180 ° as an example, a half-ring pipe covering each second exhaust gas inlet 221 is formed, compared with a ring pipe, the exhaust gas distribution housing 3 with the half-ring structure of this embodiment can reduce the bottom effusion of the exhaust gas distribution housing 3, and reduce the accumulation of the exhaust gas component in the distribution chamber 30.

Furthermore, in other embodiments, the same exhaust gas distribution housing 3 may be provided for the first exhaust gas inlet 220, aiming at even introduction of exhaust gas into the furnace chamber 20.

In some embodiments, the exhaust gas inlet 22 is configured to supply air toward a side facing away from the combustion chamber 103, and the air supply direction of the exhaust gas inlet 22 forms an included angle c with the extending direction of the central axis 4, that is, the air supply directions of the first exhaust gas inlet 220 and the second exhaust gas inlet 221 form the included angle c with the extending direction of the central axis 4, where c satisfies 90 degree no less than c no less than 45 degree, c may be any one or any two of the range values of 45 °, 46 °, 47 °, 48 °, 49 °, 50 °, 51 °, 52 °, 53 °, 54 °, 55 °, 56 °, 57 °, 58 °, 59 °, 60 °, 61 °, 62 °, 63 °, 64 °, 66 °, 67 °, 68 °, 69 °, 70 °, 71 °, 72 °, 73 °, 74 °, 77 °, 76 °, 77 °, 78 °, 79 °, 80 °, 81 °, 82 °, 83 °, 84 °, 88 °, 86 °, 87 °, 88 °, 89 °, 90 °. It is intended to feed air in the direction of combustion flue gas transport in the combustion chamber 103 and to mix well therewith.

Further, similarly, referring to fig. 6, the third air inlet 21 is configured to supply air toward a side facing away from the combustion chamber 103, and an air supply direction of the third air inlet 21 forms an angle d with an extending direction of the central axis 4, such that 90 °. Gtoreq.d. is 45 °, where d may be any one or any two of 45 °, 46 °, 47 °, 48 °, 49 °, 50 °, 51 °, 52 °, 53 °, 54 °, 55 °, 56 °, 57 °, 58 °, 59 °, 60 °, 61 °, 62 °, 63 °, 64 °, 66 °, 67 °, 68 °, 69 °, 70 °, 71 °, 72 °, 73 °, 74 °, 77 °, 76 °, 77 °, 78 °, 79 °, 80 °, 81 °, 82 °, 83 °, 84 °, 88 °, 86 °, 87 °, 88 °, 89 °, 90 °. It is intended to feed air in the direction of combustion flue gas transport in the combustion chamber 103 and to mix well therewith.

Correspondingly, the tail gas treatment method of the embodiment of the application is applied to the tail gas incineration equipment and comprises the following steps of:

air is respectively introduced into the first air inlet 104, the second air inlet 105 and the third air inlet 21, fuel gas is introduced into the fuel gas channel 110, and the fuel gas and the air are sequentially mixed in the first air cavity 100 and the combustion cavity 103 to form mixed gas;

igniting the mixture of air and gas in the combustion chamber 103 by the ignition part 140;

introducing exhaust gas into the exhaust gas inlet 22 to mix with the combusted mixture for combustion;

the burnt waste gas is discharged from the furnace body 2, the temperature of the final discharged gas of the furnace chamber 20 is controlled to be not higher than 850 ℃, and the molar concentration of oxygen is not lower than 3%.

Specifically, in some embodiments, the single air intake of the first air inlet 104 accounts for 70% to 80% of the air required for equivalent combustion of the fuel gas intake in the single fuel gas channel 110, that is, the combustion of the air and the fuel gas of the first air inlet 104 in the combustion chamber 103 is controlled to be under-oxygen combustion, which is beneficial to controlling the temperature entering the furnace chamber 20, and then the air passing through the second air inlet 105 and the third air inlet 21 is continuously mixed for combustion and adjusting the temperature, so as to reduce the generation amount of nitrogen oxides.

In addition, the ratio of the single air inlet amount of the third air inlet 21 to the sum of the single air inlet amounts of the second air inlet 105 and the third air inlet 21 is controlled to be less than or equal to 8% by the flow regulating valve 160, that is, the actual total amount of the air inlet amount of the second air inlet 105 in the embodiment, so as to avoid that the temperature of the furnace chamber 20 is greatly reduced due to the fact that the air of the excessive third air inlet 21 is led into the furnace chamber 20, and the insufficient combustion of hydrocarbon and other substances in the flue gas is influenced.

In some embodiments, the air delivery rate of the second air chamber 101 towards the combustion chamber 103 is 80m/s or more and the gas delivery rate of the gas channel 110 towards the first air chamber 100 and/or the combustion chamber 103 is 150m/s or more. In other embodiments, only one of the above-mentioned methods can be satisfied or high-speed gas transmission can be realized.

Through graded air delivery and high-speed jet flow, the air of the first air cavity 100, the gas of the gas channel 110, the air of the second air cavity 101 and the air of the third air inlet 21 can form a large backflow area in the combustion cavity 103, the smoke circulation rate can reach 3.0, the air and high-temperature smoke are intensively mixed, the temperature in the combustion cavity 103 and the furnace cavity 20 is facilitated to be more uniform, and the temperature is reduced to reduce the generation and emission of nitrogen oxides.

Finally, through the arrangement of the multi-stage air and the multi-stage tail gas, the waste gas enters the hearth in a grading manner according to the heat value, so that the temperature in the integral furnace chamber 20 can be effectively controlled, the combustion efficiency is ensured, and meanwhile, the lower pollutant emission is controlled.

The above describes in detail a sulfur recovery tail gas incineration device and a tail gas treatment method provided in the embodiments of the present application, and specific examples are applied to illustrate the principles and embodiments of the present application, where the descriptions of the above examples are only used to help understand the technical solution and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (14)

1. A sulfur recovery tail gas incineration apparatus, characterized by comprising:

the burner (1), the burner (1) comprises a shell (10) and a gas pipe (11) connected with the shell (10), a first air cavity (100), a second air cavity (101) and a combustion cavity (103) are arranged in the shell (10), the gas pipe (11) is provided with a gas channel (110), the first air cavity (100) and the second air cavity (101) are mutually separated, the shell (10) is respectively provided with a first air inlet (104) communicated with the first air cavity (100) and a second air inlet (105) communicated with the second air cavity (101), the first air cavity (100), the second air cavity (101) and the gas channel (110) are respectively communicated with the combustion cavity (103), at least part of the gas pipe (11) is positioned in the first air cavity (100), and at least part of the gas pipe (11) is provided with a first gas spray hole (111) communicated with the gas channel (110) and the first gas cavity (100);

furnace body (2), casing (10) are connected to furnace body (2), furnace body (2) have furnace chamber (20), just furnace chamber (20) intercommunication combustion chamber (103), furnace body (2) are equipped with third air inlet (21) and waste gas import (22), just third air inlet (21) with waste gas import (22) communicate respectively furnace chamber (20).

2. A sulfur recovery tail gas incineration plant according to claim 1, characterised in that,

the sulfur recovery tail gas incineration device has a central axis (4);

the burner (1) further comprises an air swirl element (12), wherein the air swirl element (12) is arranged in the first air cavity (100), and the air swirl element (12) is arranged around the central axis (4) so as to spiral and convey air towards the combustion cavity (103) along the extending direction of the central axis (4);

at least part of the gas pipe (11) penetrates through the first air cavity (100) along the central axis (4), and the first gas spray holes (111) are positioned on one side of the air swirl element (12) facing the combustion cavity (103).

3. A sulfur recovery tail gas incineration plant according to claim 2, characterised in that,

the second air cavity (101) is annularly arranged outside the gas channel (110) around the central axis (4), a refractory lining (13) is arranged in the shell (10), the refractory lining (13) surrounds the combustion cavity (103) around the central axis (4), and an air spray hole (130) for communicating the second air cavity (101) with the combustion cavity (103) is formed in the refractory lining (13);

the combustor (1) further comprises an ignition piece (14), the fireproof lining (13) is located between the first air cavity (100) and the combustion cavity (103) to form a mixing cavity (106), the first air cavity (100) and the combustion cavity (103) are communicated through the mixing cavity (106), and the ignition piece (14) is provided with an ignition part (140) which is telescopically arranged in the mixing cavity (106);

the air spray holes (130) are arranged in a plurality, and the air spray holes (130) are annularly arranged outside the mixing cavity (106) around the central axis (4);

and/or the extension direction of the air jet holes (130) is parallel to the extension direction of the central axis (4).

4. A sulfur recovery tail gas incineration plant according to claim 2, characterised in that,

at least part of the gas pipe (11) comprises a conveying pipe section (112) and a gas outlet pipe section (113) which are connected with each other, wherein the gas outlet pipe section (113) is positioned at one end of the conveying pipe section (112) towards the combustion chamber (103);

the first gas spray holes (111) are arranged in a plurality, and the first gas spray holes (111) are circumferentially arranged on the gas outlet pipe section (113) around the central axis (4);

the outlet pipe section (113) is provided with an end wall (1130) facing the combustion chamber (103), and the end wall (1130) is provided with a second gas jet orifice (114).

5. A sulfur recovery tail gas incineration plant according to claim 4, characterised in that,

the jet direction of the first gas jet hole (111) is inclined towards the combustion chamber (103), and an included angle a is formed between the jet direction of the first gas jet hole (111) and the central axis (4), so that the angle a is more than or equal to 60 degrees and more than or equal to 30 degrees.

6. A sulfur recovery tail gas incineration plant according to claim 4, characterised in that,

the second gas spray holes (114) are provided with a plurality of second gas spray holes, the plurality of second gas spray holes (114) comprise a plurality of second gas straight spray holes (1140) and a plurality of second gas inclined spray holes (1141), the plurality of second gas straight spray holes (1140) are circumferentially arranged around the central axis (4), and the plurality of second gas inclined spray holes (1141) are circumferentially arranged outside the second gas straight spray holes (1140) around the central axis (4);

the extending direction of the second fuel gas straight jet hole (1140) is parallel to the extending direction of the central axis (4);

and/or, the jet direction of the second gas inclined jet hole (1141) is inclined towards the combustion chamber (103), and an included angle b is formed between the jet direction of the second gas inclined jet hole (1141) and the central axis (4), so that the angle b is more than or equal to 60 degrees and more than or equal to 30 degrees.

7. A sulfur recovery tail gas incineration plant according to claim 6, characterised in that,

the total opening area of the first gas spray hole (111) and the second gas spray hole (114) is S;

wherein the total area of the openings of the first gas spray hole (111) is A, and the total area of the openings is more than or equal to 0.8 and more than or equal to 0.7;

and/or, the total area of the openings of the second fuel gas straight spray holes (1140) is B, and the total area is more than or equal to 0.15 and more than or equal to 0.1.

8. A sulfur recovery tail gas incineration plant according to claim 1, characterised in that,

the combustor (1) further comprises an air pipe (15) and a branch pipe (16) communicated with the air pipe (15), the air pipe (15) is communicated with the second air inlet (105), the branch pipe (16) is communicated with the third air inlet (21), and the branch pipe (16) is provided with a flow regulating valve (160).

9. A sulfur recovery tail gas incineration plant according to claim 2, characterised in that,

the exhaust gas inlet (22) comprises a first exhaust gas inlet (220) for introducing VOC exhaust gas and a second exhaust gas inlet (221) for introducing sulfur recovery exhaust gas, the first exhaust gas inlet (220) being located on a side of the second exhaust gas inlet (221) facing the combustion chamber (103).

10. A sulfur recovery tail gas incineration plant according to claim 9, characterised in that,

the second exhaust gas inlet (221) is provided with a plurality of exhaust gas inlets;

-a plurality of said second exhaust gas inlets (221) being arranged around said central axis (4);

and/or, the interval of any two second waste gas inlets (221) is less than or equal to 180 degrees around the central axis (4), and the sulfur recovery tail gas incineration equipment further comprises a waste gas distribution shell (3), the waste gas distribution shell (3) is connected with the furnace body (2), the waste gas distribution shell (3) is provided with a distribution cavity (30) for guiding in sulfur recovery tail gas, the distribution cavity (30) extends around the central axis (4) and is communicated with each second waste gas inlet (221), and the extension range of the distribution cavity (30) around the central axis (4) is less than or equal to 180 degrees.

11. A sulfur recovery tail gas incineration plant according to claim 2, characterised in that,

the exhaust gas inlet (22) is used for supplying gas towards one side deviating from the combustion cavity (103), and an included angle c is formed between the gas supplying direction of the exhaust gas inlet (22) and the extending direction of the central axis (4), so that the condition that the angle c is more than or equal to 90 degrees and more than or equal to 45 degrees is satisfied;

and/or the third air inlet (21) is used for supplying air towards one side deviating from the combustion cavity (103), and an included angle d is formed between the air supplying direction of the third air inlet (21) and the extending direction of the central axis (4), so that the condition that the d is more than or equal to 90 degrees and more than or equal to 45 degrees is satisfied.

12. A method of treating tail gas, characterized by being applied to the sulfur recovery tail gas incineration apparatus according to any one of claims 1 to 11, comprising the steps of:

air is respectively introduced into the first air inlet (104), the second air inlet (105) and the third air inlet (21), fuel gas is introduced into the fuel gas channel (110), and the fuel gas and the air are sequentially mixed in the first air cavity (100) and the combustion cavity (103) to form mixed gas;

igniting the air and gas mixture in the combustion chamber (103);

introducing exhaust gas into the exhaust gas inlet (22) to mix with the combusted mixture;

the burnt waste gas is discharged from the furnace body (2).

13. The method for treating exhaust gas according to claim 12, wherein,

the single air intake of the first air inlet (104) accounts for 70 to 80 percent of the air required for equivalent combustion of the fuel gas intake in the single fuel gas channel (110);

and/or, the ratio of the single air inlet amount of the third air inlet (21) to the sum of the single air inlet amounts of the second air inlet (105) and the third air inlet (21) is less than or equal to 8%.

14. The method for treating exhaust gas according to claim 12, wherein,

the air conveying speed of the second air cavity (101) towards the combustion cavity (103) is more than or equal to 80m/s;

and/or the gas delivery speed of the gas channel (110) towards the first air chamber (100) and/or the combustion chamber (103) is greater than 150m/s.