Sulfur recovery combustion furnace

Abstract

The utility model belongs to the technical field of sulfur recovery devices, and particularly relates to a sulfur recovery combustion furnace which comprises a sulfur production hearth, a combustion chamber, an ignition burner, an air pipeline, a process gas pipeline, an instrument air pipeline, a PSA analysis gas pipeline and a natural gas pipeline, one end of the combustion chamber is connected with the ignition burner, and the other end of the combustion chamber is connected with the sulfur production hearth; the air pipeline and the process gas pipeline are connected with the combustion chamber, the instrument air pipeline is connected with the ignition burner, the PSA analysis gas pipeline is connected with the combustion chamber, and the natural gas pipeline is communicated with the PSA analysis gas pipeline; the instrument air pipeline is provided with a first branch pipeline, the PSA analysis gas pipeline is provided with a second branch pipeline, the second branch pipeline is communicated with the PSA analysis gas pipeline and the ignition burner, the natural gas pipeline is provided with a third branch pipeline, and the third branch pipeline is communicated with the natural gas pipeline and the second branch pipeline. The device can ensure smooth ignition of the combustion furnace.

Description

Technical Field

[0001] This utility model belongs to the technical field of sulfur recovery devices, specifically relating to a sulfur recovery combustion furnace. Background Technology

[0002] The main process of sulfur recovery involves recovering hydrogen sulfide from acidic gas by washing it with low-temperature methanol. This hydrogen sulfide is then partially burned into sulfur dioxide in a combustion furnace. The remaining hydrogen sulfide is mixed with the generated sulfur dioxide in a 2:1 ratio and reacted in a Claus reactor to produce elemental sulfur, while also recovering heat.

[0003] The fuel source for existing sulfur recovery combustion furnaces is usually the low-pressure gas pipeline network within the factory. However, since the low-pressure gas pipeline network needs to supply fuel to various gas devices, the gas composition in the low-pressure gas pipeline network is often different, which can easily lead to ignition failure of the sulfur recovery combustion furnace. Utility Model Content

[0004] The purpose of this invention is to solve the problem described in the background art that the different gas components in the current low-pressure gas pipeline network easily lead to the failure of the combustion furnace to ignite. Here, a new sulfur recovery combustion furnace is proposed, which can ensure that the combustion furnace can be successfully ignited by connecting gas pipelines with different components and ignition air pipelines in parallel.

[0005] To achieve the above objectives, a technical solution is provided: a sulfur recovery combustion furnace, comprising a sulfur production furnace, a combustion chamber, an ignition burner, an air pipeline, a process gas pipeline, an instrument air pipeline, a PSA desorption gas pipeline, and a natural gas pipeline. One end of the combustion chamber is connected to the ignition burner, and the other end of the combustion chamber is connected to the sulfur production furnace.

[0006] The air line and process gas line are connected to the combustion chamber, the instrument air line is connected to the ignition burner, the PSA desorbed gas line is connected to the combustion chamber, and the natural gas line is connected to the PSA desorbed gas line.

[0007] The instrument air line has a first branch line, the PSA desorbed gas line has a second branch line, the second branch line connects the PSA desorbed gas line to the ignition burner, and the natural gas line has a third branch line, the third branch line connects the natural gas line to the second branch line.

[0008] In the above technical solution, the fuel pipeline of the ignition furnace in the original low-pressure gas pipeline network is modified so that the natural gas pipeline is connected in parallel with the PSA desorption gas pipeline, and a first branch pipeline is added to the instrument air pipeline. This ensures that the ignition burner of the sulfur recovery combustion furnace can be successfully ignited and the combustion furnace can be used normally at different times when the gas in the low-pressure gas pipeline network is not the same.

[0009] Furthermore, the instrument air line is also provided with two first control valves and a first orifice plate, the first orifice plate being located between the two first control valves, and the two first control valves being located between the first branch lines.

[0010] Furthermore, the diameter of the first perforated plate is 3.1 mm.

[0011] Furthermore, the first branch pipeline is equipped with two second control valves and a second orifice plate, with the second orifice plate located between the two second control valves.

[0012] Furthermore, the diameter of the second perforated plate is 2.7 mm.

[0013] Furthermore, the second branch pipeline is provided with two third control valves and a third orifice plate, the third orifice plate being located between the two third control valves.

[0014] In the above technical solution, the diameter of the third perforated plate is 3.4 mm.

[0015] Furthermore, the third branch pipeline is equipped with two fourth control valves and a fourth orifice plate, with the fourth orifice plate located between the two fourth control valves.

[0016] Furthermore, the diameter of the fourth perforated plate is 2 mm.

[0017] Furthermore, the connection point between the third branch pipeline and the second branch pipeline is located between the fourth control valve and the ignition burner.

[0018] In the above technical solution, the orifice diameter of the orifice plate is set by calculating the required pressure and flow rate of natural gas and PSA desorption gas, as well as the corresponding instrument air volume, to ensure successful ignition of the combustion furnace.

[0019] The advantages of this utility model are:

[0020] 1. The sulfur recovery furnace of this utility model connects two gas pipelines and two instrument air pipelines in parallel. By setting orifice plates with corresponding apertures, the gas flow rate is reduced and limited to ensure that the sulfur recovery combustion furnace can be successfully ignited. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the sulfur recovery combustion furnace of this utility model;

[0023] Figure 2 This is a temperature rise curve of the sulfur recovery combustion furnace of this utility model;

[0024] Figure 3 This is a cloud map showing the overall temperature distribution of the sulfur recovery combustion furnace of this utility model.

[0025] Diagram description: 1. Sulfur production furnace, 2. Combustion chamber, 3. Ignition burner, 4. Air line, 5. Process gas line, 6. Instrument air line, 7. PSA desorption gas line, 8. Natural gas line, 9. First branch line, 10. Second branch line, 11. Third branch line, 12. First control valve, 13. First orifice plate, 14. Second control valve, 15. Second orifice plate, 16. Third control valve, 17. Third orifice plate, 18. Fourth control valve, 19. Fourth orifice plate. Detailed Implementation

[0026] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0027] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] like Figure 1 As shown, a sulfur recovery combustion furnace is provided, which consists of a sulfur production furnace 1, a combustion chamber 2, an ignition burner 3, an air pipeline 4, a process gas pipeline 5, an instrument air pipeline 6, a PSA desorption gas pipeline 7, and a natural gas pipeline 8. One end of the combustion chamber is connected to the ignition burner, and the other end of the combustion chamber is connected to the sulfur production furnace.

[0029] The air line and process gas line are connected to the combustion chamber, the instrument air line is connected to the ignition burner, the PSA desorbed gas line is connected to the combustion chamber, and the natural gas line is connected to the end of the PSA desorbed gas line.

[0030] The instrument air line has a first branch line 9, both ends of which are connected to the instrument air line. The PSA desorption gas line has a second branch line 10, which connects the PSA desorption gas line to the ignition burner. The natural gas line has a third branch line 11, which connects the natural gas line to the second branch line.

[0031] The instrument air line is equipped with two first control valves 12 and a first orifice plate 13. The first orifice plate is located between the two first control valves, and the two first control valves are located between the connection point of the first branch line and the instrument air line.

[0032] The first branch pipeline is equipped with two second control valves 14 and a second orifice plate 15, with the second orifice plate located between the two second control valves.

[0033] The second branch pipeline is equipped with two third control valves 16 and a third orifice plate 17, with the third orifice plate located between the two third control valves.

[0034] The third branch pipeline is equipped with two fourth control valves 18 and a fourth orifice plate 19, with the fourth orifice plate located between the two fourth control valves.

[0035] The connection point between the third branch pipeline and the second branch pipeline is located between the fourth control valve and the ignition burner.

[0036] In one embodiment, the natural gas flow rate in the natural gas pipeline is 4 N m³. 3 / h, the supplied air volume is 32Nm 3 / h, the diameter of its fourth orifice plate is calculated as follows:

[0037] Serial Number name unit numerical values 1 Natural gas design volume flow rate <![CDATA[Nm 3 / h]]> 4 2 Pressure before the fourth orifice plate MPa(A) 0.32 3 Pressure after the fourth orifice plate MPa(A) 0.1 4 Fourth orifice plate diameter mm 2

[0038] The diameter of the first orifice plate is calculated as follows:

[0039] Serial Number name unit numerical values 1 Instrument air (with natural gas) design volumetric flow rate <![CDATA[Nm 3 / h]]> 32 2 Pressure before the first orifice plate MPa(A) 0.83 3 Pressure after the first orifice plate MPa(A) 0.1 4 First orifice diameter mm 3.1

[0040] In one embodiment, the PSA desorption gas flow rate in the PSA desorption gas line is 12 Nm³. 3 / h, the supplied air volume is 25Nm 3 / h, the diameter of its third orifice plate is calculated as follows:

[0041] Serial Number name unit numerical values 1 PSA desorption gas design volume flow rate Nm3 / h 12 2 Pressure before the third orifice plate MPa(A) 0.32 3 Pressure after the third orifice plate MPa(A) 0.1 4 Third orifice plate diameter mm 3.4

[0042] The calculation of the aperture of the second orifice plate is as follows:

[0043]

[0044]

[0045] The sulfur recovery combustion furnace was ignited, and its temperature rise curve and temperature distribution cloud map are shown below. Figure 2 , Figure 3 As shown, the sulfur recovery combustion furnace described in this invention can be successfully ignited and ensure normal operation of the combustion furnace.

[0046] In one embodiment, the orifice plate can be replaced with a self-regulating flow and pressure controller.

[0047] In one embodiment, a gas sensor is provided on the PSA desorption gas pipeline and the natural gas pipeline. The sensor is electrically connected to a first control valve, a second control valve, a third control valve, and a fourth control valve to identify the gas in the pipeline and control the opening and closing of the control valves.

[0048] The working process of this utility model is as follows: Since the gas composition in the low-pressure gas pipeline varies at different times, this sulfur recovery combustion furnace can automatically identify the gas composition in the low-pressure gas pipeline and control the opening and closing of different control valves. When the PSA desorbed gas pipeline is supplied with gas, the fourth control valve and the first control valve are opened, allowing instrument air and PSA desorbed gas to be introduced into the ignition burner. Through pre-calculated first and fourth orifice plates, the flow rate and pressure of the instrument air and PSA desorbed gas are controlled, ensuring successful ignition of the sulfur recovery combustion furnace. When the natural gas pipeline is supplied with gas, the third control valve and the second control valve are opened, allowing instrument air and natural gas to be introduced into the ignition burner. Through pre-calculated second and third orifice plates, the flow rate and pressure of the instrument air and natural gas are controlled, ensuring successful ignition of the sulfur recovery combustion furnace.

[0049] Finally, it should be noted that this embodiment is only for illustrating the present invention and does not limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A sulfur recovery combustion furnace, characterized in that: The sulfur recovery combustion furnace includes a sulfur production furnace (1), a combustion chamber (2), an ignition burner (3), an air pipeline (4), a process gas pipeline (5), an instrument air pipeline (6), a PSA desorption gas pipeline (7), and a natural gas pipeline (8). One end of the combustion chamber is connected to the ignition burner, and the other end of the combustion chamber is connected to the sulfur production furnace. The air line and process gas line are connected to the combustion chamber, the instrument air line is connected to the ignition burner, the PSA desorbed gas line is connected to the combustion chamber, and the natural gas line is connected to the PSA desorbed gas line. The instrument air pipeline is provided with a first branch pipeline (9), the PSA desorption gas pipeline is provided with a second branch pipeline (10), the second branch pipeline is connected to the PSA desorption gas pipeline and the ignition burner, and the natural gas pipeline is provided with a third branch pipeline (11), the third branch pipeline is connected to the natural gas pipeline and the second branch pipeline.

2. The sulfur recovery combustion furnace according to claim 1, characterized in that: The instrument air line is also provided with two first control valves (12) and a first orifice plate (13), the first orifice plate being located between the two first control valves, and the two first control valves being located between the first branch lines.

3. The sulfur recovery combustion furnace according to claim 2, characterized in that: The diameter of the first perforated plate is 3.1 mm.

4. The sulfur recovery combustion furnace according to claim 1, characterized in that: The first branch pipeline is provided with two second control valves (14) and a second orifice plate (15), with the second orifice plate located between the two second control valves.

5. The sulfur recovery combustion furnace according to claim 4, characterized in that: The diameter of the second perforated plate is 2.7 mm.

6. The sulfur recovery combustion furnace according to claim 1, characterized in that: The second branch pipeline is provided with two third control valves (16) and a third orifice plate (17), with the third orifice plate located between the two third control valves.

7. The sulfur recovery combustion furnace according to claim 6, characterized in that: The diameter of the third perforated plate is 3.4 mm.

8. The sulfur recovery combustion furnace according to claim 4, characterized in that: The third branch pipeline is provided with two fourth control valves (18) and a fourth orifice plate (19), with the fourth orifice plate located between the two fourth control valves.

9. The sulfur recovery combustion furnace according to claim 8, characterized in that: The diameter of the fourth perforated plate is 2 mm.

10. The sulfur recovery combustion furnace according to claim 8, characterized in that: The connection point between the third branch pipeline and the second branch pipeline is located between the fourth control valve and the ignition burner.

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