Device and method for absorbing tail gas in sulfur melting process

Abstract

The invention discloses a device and a method for absorbing tail gas in a sulfur melting process, and relates to the technical field of tail gas absorption treatment. Compared with the prior art, the problem that a tail gas pipeline is prone to being blocked in the tail gas absorption process of the sulfur melting tank is solved, the arranged condensation / melting device is matched with the silk screen filter, gaseous sulfur carried in the tail gas can be condensed and then intercepted, and the gaseous sulfur flows back to the sulfur melting tank to be recycled after being melted; and the gas containing hydrogen sulfide is used for removing arsenic in the contaminated acid, and meanwhile, the contaminated acid can wash other toxic and harmful gases, so that the purpose of treating waste with waste is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of tail gas absorption and treatment, and more particularly to a device and method for tail gas absorption in a sulfur melting process. Background Art

[0002] Sulfur melting refers to the melting of solid sulfur into liquid sulfur in the chemical production process. Since this process is mostly carried out in a closed environment, toxic and harmful gases such as sulfur dioxide and hydrogen sulfide will be produced during the sulfur melting process. If they are directly discharged without treatment, it will not only have a huge negative impact on our living environment, but also affect the quality of life of nearby residents, making it difficult to protect the lives and health of residents. Based on this background and negative effects, chemical companies must place the problem of exhaust emissions in a prominent position in the production process.

[0003] During the operation of the traditional molten sulfur tail gas absorption technology process, the gaseous sulfur condenses and adheres to the wall of the tail gas pipe, which can easily cause blockage of the tail gas absorption pipe 1. Clearing the pipe consumes a lot of manpower and material resources, affecting the normal production of the enterprise and being detrimental to the sustainable development of the enterprise. At the same time, the attached sulfur cannot be recycled and reused, which is not in line with the enterprise's development concept of energy conservation and emission reduction. Summary of the invention

[0004] The purpose of the present invention is to provide a device for absorbing tail gas during the sulfur melting process, which is used to solve the problems mentioned in the above background technology. The condensation / melting device equipped in the device is equipped with a wire mesh filter to condense and intercept the gaseous sulfur entrained in the tail gas, and return it to the sulfur melting tank for reuse after melting. The tail gas after removing the gaseous sulfur is used for waste acid treatment, which can achieve waste treatment with waste.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A device for absorbing tail gas during sulfur melting process, comprising: a sulfur melting tank, a tail gas absorption pipe, a gas-liquid separation chamber, a tail gas fan, and an absorption tower;

[0007] The molten sulfur tank is connected to the gas-liquid separation chamber through the tail gas absorption pipe;

[0008] The gas-liquid separation chamber is connected with the tail gas fan and the absorption tower in sequence.

[0009] Preferably, the tail gas absorption pipe includes a main circuit and two symmetrical branches; one end of the branch is connected to the main circuit and the other end is connected to the sulfur melting tank.

[0010] Preferably, a wire mesh filter is provided in the branch line to intercept the condensed solid sulfur powder during operation and use, so as to prevent the gaseous sulfur from condensing in the middle and rear end pipelines and clogging the exhaust pipeline.

[0011] Preferably, the outside of the branch is wrapped with a jacket shell layer, and circulating cooling water is passed into the jacket shell layer in the condensation section to condense the gaseous sulfur in the tail gas and then intercept the solid sulfur powder through the wire mesh filter; conversely, high-pressure steam is passed into the jacket shell layer in the sulfur melting section to melt the solid sulfur trapped in the wire mesh filter, and the melted sulfur flows to the sulfur melting tank for reuse.

[0012] Preferably, a tail suction stop valve is provided in the branch section between the jacket shell and the main road, which is used for melting sulfur and returning sulfur after pipeline switching, thereby increasing the reuse rate of sulfur in the tail gas.

[0013] Preferably, a cooling water inlet pipe is provided at the lower part of the jacket shell, and a high-pressure steam inlet pipe is provided beside the cooling water inlet pipe.

[0014] Preferably, a cooling water outlet pipe is provided on the upper portion of the jacket shell, and a steam condensate outlet pipe is provided beside the cooling water outlet pipe.

[0015] Preferably, the cooling water inlet pipe, cooling water outlet pipe, high-pressure steam inlet pipe, and steam condensate outlet pipe are all provided with stop valves for switching the circulating medium inside the jacket shell.

[0016] Preferably, an exhaust pipe is provided on the top of the absorption tower; and a pressure gauge is provided on the tail gas absorption pipe.

[0017] Another object of the present invention is to provide a method for absorbing tail gas in a sulfur melting process, using the above-mentioned device, comprising the following steps:

[0018] (1) The two branches are respectively recorded as tail suction device 1 and tail suction device 2. Before working, check whether the wire mesh filters in tail suction device 1 and tail suction device 2 are blocked. If the wire mesh filters are normal, manually fully open the stop valve on the cooling water outlet pipe of suction device 1 and half open the stop valve on the cooling water inlet pipe to fill the jacket shell with cooling water. At this time, the tail gas absorption device is the condensation section;

[0019] (2) After the liquid inside the gas-liquid separation chamber is emptied, the tail suction stop valve on the tail gas absorption pipe is opened and the tail gas blower is started. At this time, the molten sulfur tail gas in the molten sulfur tank enters the gas-liquid separation chamber through the tail gas absorption pipe for gas-liquid separation. The liquid volume is retained in the lower part of the gas-liquid separation chamber, and the tail gas enters the absorption tower for waste acid treatment;

[0020] (3) During the operation of the device, observe the pressure gauge on the tail gas absorption pipe. If the pressure is abnormal, switch to another set of tail suction device 2, and switch it from the sulfur melting section to the condensation section; after injecting cooling water into the jacket shell of the tail suction device 2, open its tail suction stop valve, observe that the pressure is normal, close the tail suction stop valve of the tail suction device 1, cut off the cooling water inlet and outlet, open the steam condensate outlet pipe stop valve and the high-pressure steam inlet pipe stop valve in turn, switch it from the condensation section to the sulfur melting section, and pass high-pressure steam into the jacket shell to melt the solid sulfur accumulated in the wire mesh filter and then flow it to the sulfur melting tank for recycling;

[0021] (4) After the sulfur that is clogged inside the wire mesh filter has melted, take out the wire mesh filter and use an ultrasonic cleaner to deep clean it before installing it for use.

[0022] It can be seen from the above technical solution that compared with the prior art, the present invention has the following beneficial effects:

[0023] Compared with the existing chemical molten sulfur tail gas absorption device, the present invention can be provided with a switching sulfur melting section / condensation section, thereby preventing the gaseous sulfur in the tail gas from condensing in the middle and rear end pipelines and adhering to the pipe wall to cause blockage of the tail gas pipeline. At the same time, the gaseous sulfur in the tail gas can be condensed and recycled, which greatly improves the long-term operation stability of the absorption device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 It is a structural diagram of the device of the present invention;

[0026] Among them, in the figure:

[0027] 1- tail gas absorption pipe, 111- main road, 112- branch road, 2- gas-liquid separation chamber, 3- absorption tower, 4- tail gas fan, 5- exhaust pipe, 6- tail suction stop valve, 7- jacket shell, 8- wire mesh filter, 9- sulfur melting tank, 10- steam condensate return pipe, 11- cooling water outlet pipe, 12- high-pressure steam inlet pipe, 13- cooling water inlet pipe, 14- pressure gauge. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1

[0030] This embodiment provides a device for absorbing tail gas during sulfur melting, comprising: a sulfur melting tank 9, a tail gas absorption pipe 1, a gas-liquid separation chamber 2, a tail gas fan 4, and an absorption tower 3;

[0031] The sulfur melting tank 9 is connected to the gas-liquid separation chamber 2 through the tail gas absorption pipe 1;

[0032] The gas-liquid separation chamber 2 is connected to the tail gas blower 4 and the absorption tower 3 in sequence through pipelines.

[0033] In this embodiment, the tail gas absorption pipe 1 includes a main path 111 and two symmetrical branches 112 ; one end of the branch 112 is connected to the main path 111 and the other end is connected to the sulfur melting tank 9 .

[0034] A wire mesh filter 7 is provided in the branch 112 to intercept the condensed solid sulfur powder during operation and prevent the gaseous sulfur from condensing in the middle and rear end pipelines and clogging the exhaust pipeline.

[0035] The outside of the branch 112 is wrapped with a jacket shell 7, and circulating cooling water is passed into the jacket shell 7 in the condensation section to condense the gaseous sulfur in the tail gas and then intercept the solid sulfur powder through the wire mesh filter 8; on the contrary, in the sulfur melting section, high-pressure steam is passed into the jacket shell 7 to melt the solid sulfur trapped in the wire mesh filter 8, and the melted sulfur flows to the sulfur melting tank for reuse.

[0036] The branch line 112 between the jacket shell 7 and the main line 111 is provided with a tail suction stop valve 6 for molten sulfur recycle after pipeline switching, thereby increasing the reuse rate of sulfur in the tail gas.

[0037] A cooling water inlet pipe 13 is provided at the lower part of the jacket shell 7 , and a high-pressure steam inlet pipe 12 is provided beside the cooling water inlet pipe 13 .

[0038] A cooling water outlet pipe 11 is arranged on the upper part of the jacket shell 7 , and a steam condensate outlet pipe 10 is arranged beside the cooling water outlet pipe 11 .

[0039] The cooling water inlet pipe 13 , the cooling water outlet pipe 11 , the high-pressure steam inlet pipe 12 , and the steam condensate outlet pipe 10 are all provided with stop valves for switching the circulating medium inside the jacket shell 7 .

[0040] An exhaust pipe 5 is provided on the top of the absorption tower 3 .

[0041] A pressure gauge 14 is installed on the tail gas absorption pipe 1 to observe and determine whether the wire mesh filter 8 is blocked.

[0042] Example 2

[0043] This embodiment provides a method for absorbing tail gas using the above-mentioned device for absorbing tail gas in the sulfur melting process, including:

[0044] (1) The two branches are respectively marked as tail suction device 1 and tail suction device 2. Before working, check whether the wire mesh filter 8 of the tail suction device 1 and the tail suction device 2 is blocked. If the wire mesh filter 8 is normal, manually fully open the stop valve on the cooling water outlet pipe 11 of the tail suction device 1 and half open the stop valve on the cooling water inlet pipe 13 to fill the jacket shell 7 with cooling water. At this time, the tail gas absorption device is the condensation stage;

[0045] (2) After the liquid inside the gas-liquid separation chamber 2 is emptied, the tail suction stop valve 6 on the tail gas absorption pipe 1 is opened and the tail gas blower 4 is started. At this time, the molten sulfur tail gas in the molten sulfur tank enters the gas-liquid separation chamber 2 through the tail gas absorption pipe 1 for gas-liquid separation, and the liquid volume is retained in the lower part of the gas-liquid separation chamber 2, and the tail gas enters the absorption tower 3 for waste acid treatment;

[0046] (3) During the operation of the device, the pressure gauge 14 on the tail gas absorption pipe 1 is observed. If the pressure is abnormal, another set of tail suction device 2 is switched to be used, and it is switched from the sulfur melting section to the condensation section; after cooling water is injected into the jacket shell 7 of the tail suction device 2, its tail suction stop valve 6 is opened. After observing that the pressure is normal, the tail suction stop valve 6 of the tail suction device 1 is closed, and after the cooling water inlet and outlet are cut off, the steam condensate outlet pipe 10 stop valve and the high-pressure steam inlet pipe 12 stop valve are opened in turn to switch it from the condensation section to the sulfur melting section, and high-pressure steam is introduced into the jacket shell to melt the solid sulfur accumulated in the wire mesh filter 8 and then flow to the sulfur melting tank for recycling;

[0047] (4) After the sulfur blocking the wire mesh filter 8 has melted, the wire mesh filter 8 is taken out and deeply cleaned using an ultrasonic cleaning machine before being installed for use.

[0048] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0049] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for absorbing tail gas in a sulfur melting process, characterized in that: include: Sulfur melting tank, tail gas absorption pipe, gas-liquid separation chamber, tail gas fan, absorption tower; The molten sulfur tank is connected to the gas-liquid separation chamber through the tail gas absorption pipe; The gas-liquid separation chamber is connected with the tail gas fan and the absorption tower in sequence.

2. The device for absorbing tail gas in a sulfur melting process according to claim 1, characterized in that: The tail gas absorption pipe comprises a main circuit and two symmetrical branches; one end of the branch is connected to the main circuit and the other end is connected to the sulfur melting tank.

3. The device for absorbing tail gas in a sulfur melting process according to claim 2, characterized in that: A wire mesh filter is arranged in the branch.

4. The device for absorbing tail gas in a sulfur melting process according to claim 3, characterized in that: The branch is externally wrapped with a jacket shell.

5. The device for absorbing tail gas in a sulfur melting process according to claim 4, characterized in that: A tail suction stop valve is provided in the branch section between the jacket shell and the main road.

6. The device for absorbing tail gas in a sulfur melting process according to claim 5, characterized in that: A cooling water inlet pipe is arranged at the lower part of the jacket shell, and a high-pressure steam inlet pipe is arranged beside the cooling water inlet pipe.

7. The device for absorbing tail gas in a sulfur melting process according to claim 6, characterized in that: A cooling water outlet pipe is arranged on the upper part of the jacket shell, and a steam condensate outlet pipe is arranged beside the cooling water outlet pipe.

8. The device for absorbing tail gas in a sulfur melting process according to claim 7, characterized in that: The cooling water inlet pipe, cooling water outlet pipe, high-pressure steam inlet pipe and steam condensate outlet pipe are all provided with stop valves.

9. The device for absorbing tail gas in a sulfur melting process according to claim 8, characterized in that: An exhaust pipe is arranged on the top of the absorption tower; and a pressure gauge is arranged on the tail gas absorption pipe.

10. A method for absorbing tail gas in a sulfur melting process, characterized in that: The device according to claim 9 comprises the following steps: (1) The two branches are respectively recorded as tail suction device 1 and tail suction device 2. Before working, check whether the wire mesh filters in tail suction device 1 and tail suction device 2 are blocked. If the wire mesh filters are normal, manually fully open the stop valve on the cooling water outlet pipe of suction device 1 and half open the stop valve on the cooling water inlet pipe to fill the jacket shell with cooling water. At this time, the tail gas absorption device is the condensation section; (2) After the liquid inside the gas-liquid separation chamber is emptied, the tail suction stop valve on the tail gas absorption pipe is opened and the tail gas blower is started. At this time, the molten sulfur tail gas in the molten sulfur tank enters the gas-liquid separation chamber through the tail gas absorption pipe for gas-liquid separation. The liquid volume is retained in the lower part of the gas-liquid separation chamber, and the tail gas enters the absorption tower for waste acid treatment; (3) During the operation of the device, observe the pressure gauge on the tail gas absorption pipe. If the pressure is abnormal, switch to another set of tail suction device 2, and switch it from the sulfur melting section to the condensation section; after injecting cooling water into the jacket shell of the tail suction device 2, open its tail suction stop valve, observe that the pressure is normal, close the tail suction stop valve of the tail suction device 1, cut off the cooling water inlet and outlet, open the steam condensate outlet pipe stop valve and the high-pressure steam inlet pipe stop valve in turn, switch it from the condensation section to the sulfur melting section, and pass high-pressure steam into the jacket shell to melt the solid sulfur accumulated in the wire mesh filter and then flow it to the sulfur melting tank for recycling; (4) After the sulfur that is clogged inside the wire mesh filter has melted, take out the wire mesh filter, use an ultrasonic cleaner to deep clean it, and then install it for use.

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