Sulfur recovery tail gas incineration equipment

Abstract

The utility model relates to sulfur recovery tail gas incineration equipment which comprises a shell and a flame path located in the shell, the tail end of a fuel gas conveying pipeline used for providing fuel gas for the equipment is connected with a first conveying branch pipe and a second conveying branch pipe, and the first conveying branch pipe is connected with a main fuel gas inlet of a fuel spray gun. The main fuel gas is fed into the flame path through a fuel spray gun penetrating through the shell to enter the flame path inlet; the second conveying branch pipe is connected with a secondary fuel gas inlet in the shell, and secondary fuel gas is conveyed into the tail gas cavity to be mixed with tail gas through a distribution component in the secondary fuel gas inlet. And a flow regulating valve is arranged on the first conveying branch pipe or the second conveying branch pipe. Part of fuel gas and tail gas are mixed, the combustion efficiency of the tail gas in the hearth is improved, CO is reduced, and the concentration of pollutants in the tail gas is remarkably reduced. Fuel in the flame path is reduced, the combustion flame temperature is low, and generation of thermal NOx during combustion can be effectively controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of burners, and particularly designs a sulfur recovery tail gas incineration device. Background Technique

[0002] Hydrogen sulfide-containing sour gas is generally generated in the production processes such as petroleum refining, natural gas purification, coking, coal gasification, and petroleum processing. Since hydrogen sulfide is highly toxic, flammable, and explosive, this gas cannot be directly discharged into the atmosphere. Usually, a tail gas incinerator is required to incinerate and oxidize the tail gas generated in the sulfur recovery process in the furnace before discharging. With the increasingly strict environmental protection requirements, many petrochemical plants have put forward requirements for lower emission indicators for sulfur recovery tail gas incinerators. For example, volatile organic compound waste gases discharged from devices such as sulfur-containing storage tanks and liquid pools are also sent into the incinerator for incineration treatment, making it more difficult to control the emissions of nitrogen oxides (NO X ), non-methane total hydrocarbons, etc. at the outlet of the tail gas incinerator. In existing burners, due to the uneven mixing of tail gas and air, the concentration of tail gas after incineration often fails to meet the standards. Therefore, developing a burner to reduce the concentration of harmful substances in the tail gas after incineration and make the tail gas emissions meet the national standards is an urgent problem for those skilled in the art. Summary of the Invention

[0003] To solve the above problems, the utility model provides a sulfur recovery tail gas incineration device with a novel structure, which grades the fuel gas, mixes part of the fuel gas with the tail gas, increases the calorific value of the tail gas fuel gas, improves the combustion efficiency of the tail gas in the furnace, reduces the generation of CO, and significantly reduces the pollutant concentration in the tail gas. The fuel in the flue reduces the combustion flame temperature, thereby effectively controlling the formation of thermal NOx during combustion.

[0004] The purpose of the utility model and the solution to its technical problems are achieved by adopting the following technical solutions. A sulfur recovery tail gas incineration device proposed according to the utility model includes a shell and a flue located inside the shell. Among them, the shell is provided with a tail gas inlet, a primary air inlet, and a secondary air inlet. Inside the shell, there are a tail gas cavity, a primary air cavity, and a secondary air cavity. The end of the fuel gas pipeline for providing fuel gas for the device is respectively connected to a first conveying branch pipe and a second conveying branch pipe. Among them, the first conveying branch pipe is connected to the main fuel gas inlet of the fuel spray gun, and the main fuel gas is sent into the flue through the fuel spray gun passing through the shell and entering the flue inlet; the second conveying branch pipe is connected to the secondary fuel gas inlet on the shell, and the secondary fuel gas is sent into the tail gas cavity through the distribution component in the secondary fuel gas inlet to be mixed with the tail gas; a flow regulating valve is provided on the first conveying branch pipe or the second conveying branch pipe.

[0005] The purpose of the utility model and the solution to its technical problems can also be further realized by adopting the following technical measures.

[0006] The aforementioned sulfur recovery tail gas incineration equipment, the air conveying pipeline for conveying combustion-supporting air is respectively connected to the primary air inlet and the secondary air inlet through a first branch pipeline and a second branch pipeline, and a regulating valve is provided on one of the branch pipelines.

[0007] The aforementioned sulfur recovery tail gas incineration equipment, the distribution member includes a distribution main pipe and a plurality of distribution branch pipes arranged at intervals along the circumference of the distribution main pipe, and a plurality of air holes are provided on each distribution branch pipe.

[0008] The aforementioned sulfur recovery tail gas incineration equipment, there are a plurality of the distribution members, and they are annularly distributed in the tail gas cavity, and the second conveying branch pipe is connected to each distribution member through an annular distribution main pipe.

[0009] The aforementioned sulfur recovery tail gas incineration equipment, the distribution member is a closed cavity composed of a housing at the secondary fuel gas inlet and a baffle fixed in the housing, and air holes are provided on the baffle opposite to the housing, so that the secondary fuel gas sent into the closed cavity through the secondary fuel gas inlet by the second conveying branch pipe can enter the tail gas cavity through the air holes.

[0010] The aforementioned sulfur recovery tail gas incineration equipment, both the secondary fuel gas inlet and the distribution member are located inside the tail gas inlet, and the distribution member includes a main body part for connecting to the second conveying branch pipe and a plurality of ribs distributed on the outer circumference of the main body part. A diversion groove for the tail gas flowing from the tail gas inlet to the tail gas cavity is formed between adjacent ribs, a gas flow channel is provided in each rib, and a plurality of air holes are provided on the end faces of the rib ends.

[0011] The aforementioned sulfur recovery tail gas incineration equipment, a secondary air swirler is connected between the secondary air cavity and the furnace behind the flue. There are a plurality of the secondary air swirlers, all of which are flat and arranged in a circumferential array on the outer periphery of the flue.

[0012] The aforementioned sulfur recovery tail gas incineration equipment, the tail gas cavity is connected to the furnace through a plurality of tail gas swirlers, and the above-mentioned tail gas swirlers and secondary air swirlers are alternately distributed in a circumferential array on the outer periphery of the flue.

[0013] The aforementioned sulfur recovery tail gas incineration equipment, the tail gas cavity is an annular cavity between the housing and the flue, and the annular cavity is divided into several small cavities extending along the axial direction of the flue on the side close to the furnace, and a secondary air swirler is penetrated in each small cavity.

[0014] The present utility model has obvious advantages and beneficial effects compared with the prior art. By means of the above technical solutions, the present utility model can achieve quite high technical progressiveness and practicality, and has wide industrial utilization value. It has at least the following advantages:

[0015] 1. By carrying out staged combustion in the burner of the tail gas incinerator, mixing part of the fuel gas and the tail gas, the calorific value of the tail gas fuel gas is increased, the combustion efficiency of the tail gas in the furnace is improved, and the fuel in the flue is reduced, and the combustion flame temperature is low, which can effectively control the generation of thermal NOx during combustion.

[0016] 2. By setting the supply of secondary fuel gas, the total amount of fuel gas can be flexibly adjusted, avoiding the situation that the supply amount of the main fuel gas is too large under the conventional supply method, resulting in unstable combustion flame or even flameout of the burner.

[0017] 3. The secondary combustion air surrounds the periphery of the combustion flue, which can reduce the outer surface temperature of the flue, improve the service life of the refractory material, and the secondary combustion air is also preheated, reducing the impact on the flame due to too low air temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic flow chart of an embodiment of the present utility model;

[0019] Figure 2 It is a schematic diagram of the sulfur recovery tail gas incineration equipment in Embodiment 1 of the present utility model;

[0020] Figure 3 It is a schematic diagram of the secondary fuel gas mixing component in Embodiment 1 of the present utility model;

[0021] Figure 4 It is a schematic diagram of the secondary air swirler in Embodiment 1 of the present utility model;

[0022] Figure 5 It is a schematic diagram of the sulfur recovery tail gas incineration equipment in Embodiment 2 of the present utility model;

[0023] Figure 6 It is a schematic diagram of the sulfur recovery tail gas incineration equipment in Embodiment 3 of the present utility model;

[0024] Figure 7 It is a schematic diagram of the secondary fuel gas mixing component in Embodiment 3 of the present utility model;

[0025]

MAIN ELEMENT SYMBOL DESCRIPTION

[0026] 1: Tail gas inlet 2: Secondary fuel gas inlet

[0027] 3: Primary air inlet 4: Ignition gun

[0028] 5: Main fuel gas inlet 6: Steam inlet

[0029] 7: Flame detector 8: Secondary air inlet

[0030] 202: Distribution component 2021: Distribution main pipe

[0031] 2022: Distribution branch pipe 2023: Air hole

[0032] 301: Secondary air swirler 101: Housing

[0033] 102: Flue 103: Primary air swirler

[0034] 104: Tail gas chamber 105: Secondary air chamber

[0035] 106: Primary air chamber 107: Furnace

[0036] 22: Flow regulating valve 11: Tail gas

[0037] 33: Fuel gas 44: Combustion-supporting air

[0038] 55: Regulating valve 108: Baffle Specific embodiments

[0039] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific embodiments, structures, features and their effects of the sulfur recovery tail gas incineration equipment proposed according to the present invention as follows.

[0040] Please refer to Figure 1 , which is a schematic diagram of the combustion method of the sulfur recovery tail gas incineration equipment of the present invention. The incineration equipment divides the fuel gas 33 into main fuel gas and secondary fuel gas. Among them, the main fuel gas enters the flue of the burner for combustion, and the secondary fuel gas is mixed with the tail gas 11 to be incinerated and then enters the furnace for combustion. Adding secondary fuel gas to the tail gas 11 to be incinerated can increase the calorific value of the tail gas, improve the combustion efficiency of the tail gas, reduce the generation of CO during the incineration process, facilitate the complete incineration of harmful substances in the tail gas, and at the same time, the separated secondary fuel gas can also reduce the amount of main fuel gas entering the flue, so that the temperature in the central region of the flame in the flue is reduced, and the generation of thermal NOx is reduced. Thus, the present invention can reduce the generation of NOx and CO simultaneously by dividing the fuel gas into main fuel gas entering the flue for combustion and secondary fuel gas mixed with the tail gas to be incinerated. Preferably, the flow rate of the secondary fuel gas is less than 1 / 3 of the total fuel gas flow rate, so that the temperature in the flue is maintained at 1400 - 1600 degrees Celsius. The combustion-supporting air 44 for the fuel gas is also divided into two stages, namely primary combustion-supporting air entering the flue of the burner to support the combustion of the main fuel gas and secondary combustion-supporting air entering the incineration furnace to support the combustion of the mixture of secondary fuel gas and tail gas.

[0041] Please refer to Figure 2, which is a schematic structural diagram of the sulfur recovery tail gas incineration equipment according to Embodiment 1 of the present utility model. The incineration equipment includes a housing 101 and a flue 102 located inside the housing 101. The fuel spray gun passes through the housing 101 and enters the chamber inlet of the flue 102, for conveying the main fuel gas into the chamber of the flue 102. The fuel spray gun is connected to the first conveying branch pipe on the fuel gas conveying pipeline through the main fuel gas inlet 5 thereon, and the fuel gas conveying pipeline is also connected to the secondary fuel gas inlet 2 on the housing 101 through the second conveying branch pipe, for conveying a part of the fuel separated from the fuel gas conveying pipeline to the secondary fuel gas inlet 2.

[0042] A tail gas chamber 104 is formed between the housing 101 and the flue 102, and a tail gas inlet 1 for conveying tail gas to the tail gas chamber 104 is further provided on the housing 101; the secondary fuel gas also enters the tail gas chamber 104, and after being mixed with the tail gas, enters the furnace 107 behind the flue for incineration. In this embodiment, the fuel gas conveying pipeline is connected to a distribution member 202 through the second conveying branch pipe, and the distribution member 202 passes through the secondary fuel gas inlet 2 and enters the tail gas chamber 104, for conveying fuel gas into the tail gas chamber 104. A plurality of air holes are provided at the end of the distribution member 202, and the fuel gas is sprayed into the tail gas chamber through the air holes, realizing the uniform distribution of the fuel gas in the tail gas chamber and enhancing the mixing of the fuel gas in the tail gas chamber.

[0043] In this embodiment, the tail gas inlet 1 and the secondary fuel gas inlet 2 are located at different positions on the housing 101.

[0044] Please refer to Figure 3 , in this embodiment, the distribution member 202 is of a distribution pipe structure, including a distribution main pipe 2021 and a plurality of distribution branch pipes 2022 circumferentially and spaced apart along the distribution main pipe. A plurality of air holes 2023 are provided on each distribution branch pipe 2022. The distribution main pipe 2021 is connected to the second conveying branch pipe, and the fuel gas conveyed to the distribution main pipe 2021 through the second conveying branch pipe enters each distribution branch pipe 2022, and then is ejected from the air holes 2023 on the distribution branch pipes 2022 and enters the tail gas chamber to be mixed with the tail gas. Preferably, there are a plurality of the distribution members 202, which are annularly distributed in the tail gas chamber 104, and the distribution main pipes of each distribution member 202 are connected to the second conveying branch pipe through a distribution main pipe.

[0045] In this embodiment, a flow regulating valve 22 is provided on the second delivery branch pipe for delivering fuel gas into the tail gas chamber 104. The amount of fuel gas delivered into the tail gas chamber can be adjusted through this flow regulating valve 22, so that the flow rates of the main fuel gas and the secondary fuel gas can be distributed under the condition that the total fuel amount remains unchanged during the operation state, and the calorific value of the tail gas and the temperature in the flue can be adjusted. In other embodiments of the present utility model, a flow regulating valve can also be provided only on the first delivery branch pipe for delivering fuel gas to the fuel spray gun, and the flow rate distribution of the main fuel gas and the secondary fuel gas can be achieved through this flow regulating valve.

[0046] A primary air inlet 3 and a secondary air inlet 8 are further provided on the housing 101, and a primary air chamber 106 and a secondary air chamber 105 are also formed and distributed in the housing 101. Among them, the combustion-supporting air entering from the primary air inlet 3 enters the primary air chamber 106, and the combustion-supporting air entering from the secondary air inlet 8 enters the secondary air chamber 105. The outlet of the primary air chamber 106 is connected to the inlet of the primary air swirler 103, and after passing through the air swirler 103, it enters the chamber of the flue 102 in a swirling form and mixes and burns with the main fuel gas in the chamber of the flue 102.

[0047] The combustion-supporting air in the secondary air chamber 105 enters the furnace chamber 107 from the outside of the flue 102 and mixes with the mixture of the tail gas and the secondary fuel gas. In this embodiment, the secondary air chamber 105 sends the secondary air into the furnace chamber 107 through a secondary air swirler 105. One end of the secondary air swirler 105 is communicated with the secondary air chamber, and the other end is communicated with the furnace chamber of the incinerator. Preferably, there are a plurality of the secondary air swirlers 105, which are flat-shaped. Please refer to Figure 4 , the swirl vanes of the above-mentioned secondary air swirler 105 are arranged in a circumferential array on the outer circumference of the flue 102. Preferably, the angle between the swirl vanes of the above-mentioned secondary air swirler 105 and the central axis of the burner is 20° to 60°.

[0048] In this embodiment, the tail gas chamber 104 is an annular chamber located between the housing 101 and the flue 102, and the tail gas chamber 104 is divided into a plurality of small chambers extending along the axial direction of the flue by a plurality of circumferentially distributed partitions on the side close to the furnace chamber 107. The setting of this small chamber can increase the flow rate of the mixed gas entering the furnace chamber 107 from the tail gas chamber 104 and enhance its mixing with the secondary air. In this embodiment, the secondary air swirler 105 passes through the tail gas chamber 104. Preferably, one secondary air swirler 105 is provided in each small chamber of the tail gas chamber, and the tail gas passes through the gap between the secondary air swirler 105, the partition and the flue.

[0049] In another embodiment of the present utility model, the tail gas cavity 104 is an annular cavity located between the housing 101 and the flue 102. At this time, the tail gas cavity 104 only includes the annular cavity on the side away from the furnace chamber 107 between the housing 101 and the flue 102, and a tail gas cyclone is provided at the end (the end close to the furnace chamber) of the annular cavity. There are multiple tail gas cyclones, which are distributed on the outer periphery of the flue. One end of each tail gas cyclone is communicated with the tail gas cavity 104, and the other end is communicated with the furnace chamber. The swirl vanes at the outlet of the tail gas cyclone are substantially parallel to the swirl direction of the secondary air cyclone. In this embodiment, the secondary air cyclone 105 passes through the tail gas cavity 104 and is distributed on the outer periphery of the flue 102 at intervals with the tail gas cyclone in a circumferential array. Preferably, the angles between the swirl vanes of the secondary air cyclone and the tail gas cyclone and the central axis of the flue are both 20° to 60°.

[0050] The fuel spray gun is further provided with a steam inlet 6, and a one-way valve is provided at the steam inlet. When the incinerator is overheated or the NOX of the incinerator exceeds the standard, steam can be introduced for cooling.

[0051] The flue is provided with a conical inlet section, and the mixing gas fuel spray gun head of the fuel spray gun is arranged in the conical section inlet. The conical inlet section is in a conical closing shape, and the cross-sectional area of the conical section inlet gradually decreases along the overall flow direction of the material medium in the fuel spray gun; the discharge port of the mixing gas fuel spray gun head is flush with the end with the smallest cross-sectional area of the conical section inlet.

[0052] The primary air inlet and the secondary air inlet of the present utility model are respectively connected to the air conveying pipeline through the first branch pipeline and the second branch pipeline, and a regulating valve 55 is provided on one of the branch pipelines.

[0053] Please refer to Figure 5 , which is a schematic structural diagram of Embodiment 2 of the present utility model. The difference between this embodiment and Embodiment 1 is that: the distribution member 202 is composed of a housing located at the secondary fuel gas inlet 2 and a baffle 108 fixed inside the housing, and there are multiple baffle plates 108, which sequentially enclose a closed cavity with the housing (the closed cavity is located in the tail gas cavity), and air holes are provided on the baffle 108 opposite to the housing, so that the secondary fuel gas sent into the closed cavity through the second conveying branch pipe by the secondary fuel gas 2 can enter the tail gas cavity through the air holes and be uniformly mixed with the tail gas.

[0054] Please refer to Figure 6 and Figure 7, a schematic structural view of Embodiment 3 of the present utility model. The difference between this embodiment and Embodiment 1 is that: the tail gas inlet 1 and the secondary fuel gas inlet 2 are located on the same side of the housing, and the secondary fuel gas inlet 2 is located inside the tail gas inlet 1; the distribution member 202 is also located inside the tail gas inlet 1. The distribution member 202 includes a main body portion 2024 and a plurality of ribs 2025 distributed on the outer periphery of the main body portion. Flow guiding grooves 2026 for the tail gas to pass through are formed between adjacent ribs. And along the flowing direction of the tail gas, the thickness of each rib in the radial direction of the main body portion gradually increases, and a gas flow channel is provided in each rib, and a plurality of air holes 2023 are provided at a position where the end is far from the main body portion. Thus, the secondary fuel gas entering the main body 2024 of the distribution member 202 from the second delivery branch pipe flows through the gas flow channels in each rib 2025 to the end of the rib and is ejected from the air holes 2023 on the end face of the end, and is mixed with the tail gas in the flow guiding groove 2026. The arrangement of the ribs in this embodiment not only provides a flow guiding groove 2026 for the tail gas, but also enables the secondary fuel gas to be dispersed and ejected through small-sized air holes, so that the tail gas and the secondary fuel gas can be quickly and evenly mixed.

[0055] The above is only a preferred embodiment of the present utility model, and does not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to be equivalent change equivalent embodiments within the scope of the technical solution of the present utility model. However, as long as the content does not depart from the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A sulfur recovery tail gas incineration device, which comprises a housing and a flue located inside the housing. The housing is provided with a tail gas inlet, a primary air inlet and a secondary air inlet. Inside the housing, there are a tail gas cavity, a primary air cavity and a secondary air cavity. It is characterized in that: The ends of the fuel gas delivery pipelines for supplying fuel gas to the device are respectively connected to the first delivery branch pipe and the second delivery branch pipe. Among them, the first delivery branch pipe is connected to the main fuel gas inlet of the fuel spray gun, and the main fuel gas is sent into the flue through the fuel spray gun that passes through the housing and enters the flue inlet; the second delivery branch pipe is connected to the secondary fuel gas inlet on the housing, and the secondary fuel gas is sent into the tail gas cavity through the distribution component in the secondary fuel gas inlet to be mixed with the tail gas; a flow regulating valve is provided on the first delivery branch pipe or the second delivery branch pipe.

2. The sulfur recovery tail gas incineration equipment according to claim 1, characterized in that: The air delivery pipeline for delivering combustion-supporting air is respectively connected to the primary air inlet and the secondary air inlet through the first branch pipeline and the second branch pipeline, and a regulating valve is provided on one of the branch pipelines.

3. The sulfur recovery tail gas incineration equipment according to claim 1, characterized in that: The distribution component includes a distribution main pipe and a plurality of distribution branch pipes arranged at intervals along the circumference of the distribution main pipe, and a plurality of air holes are provided on each distribution branch pipe.

4. The sulfur recovery tail gas incineration equipment according to claim 2, characterized in that: There are multiple distribution components, and they are annularly distributed in the tail gas cavity. The second delivery branch pipe is connected to each distribution component through an annular distribution main pipe.

5. The sulfur recovery tail gas incineration equipment according to claim 1, characterized in that: The distribution component is a closed cavity composed of the housing at the secondary gas inlet and the baffle fixed in the housing, and air holes are provided on the baffle opposite to the housing, so that the secondary fuel gas sent into the closed cavity through the secondary fuel gas inlet by the second delivery branch pipe can enter the tail gas cavity through the air holes.

6. The sulfur recovery tail gas incineration equipment according to claim 1, characterized in that: The secondary fuel gas inlet and the distribution component are both located in the tail gas inlet, and the distribution component includes a main body part for connecting to the second delivery branch pipe and a plurality of ribs distributed on the outer circumference of the main body part. A diversion groove for the tail gas flowing from the tail gas inlet to the tail gas cavity is formed between adjacent ribs, and a gas flow channel is provided in each rib, and a plurality of air holes are provided on the end faces of the rib ends.

7. The sulfur recovery tail gas incineration equipment according to any one of claims 1-6, characterized in that: A secondary air swirler is connected between the secondary air cavity and the furnace behind the flue. There are multiple secondary air swirlers, all of which are flat and arranged in a circumferential array on the outer circumference of the flue.

8. The sulfur recovery tail gas incineration equipment according to claim 7, characterized in that: The tail gas cavity is connected to the furnace through a plurality of tail gas swirlers, and the above-mentioned tail gas swirlers and secondary air swirlers are alternately distributed in a circumferential array on the outer circumference of the flue.

9. The sulfur recovery tail gas incineration equipment according to claim 7, characterized in that: The tail gas cavity is an annular cavity between the housing and the flue, and the annular cavity is divided into several small cavities extending along the axial direction of the flue on the side close to the furnace, and a secondary air swirler is arranged in each small cavity.

10. The sulfur recovery tail gas incineration equipment according to claim 8, characterized in that: The tail gas cavity is an annular cavity between the housing and the flue, and the annular cavity is divided into several small cavities extending along the axial direction of the flue on the side close to the furnace, and a secondary air swirler is arranged in each small cavity.

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