A closed-loop collecting device for escaping hydrogen sulfide gas from a liquid sodium hydrosulfide storage tank

Abstract

This utility model discloses a closed-loop collection device for hydrogen sulfide gas escaping from a liquid sodium hydrosulfide storage tank, belonging to the field of chemical waste gas treatment technology. It includes a liquid sodium hydrosulfide storage tank, a secondary scavenging tower, and a scavenging fan. Pipeline a is installed at the breather valve on the top of the liquid sodium hydrosulfide storage tank. The outlet end of pipe a is connected to the inlet end of the scavenging fan. A PTFE-lined ball valve is installed on pipe a. The outlet end of the scavenging fan is connected to pipe b, and the outlet end of pipe b is located inside the secondary scavenging tower. This utility model is simple to manufacture and low in cost, yet it achieves excellent results. By setting up a steel-framed composite pipe, a PTFE-lined ball valve, and a scavenging fan, it perfectly achieves its intended effect, completely solving the risk of environmental pollution caused by hydrogen sulfide gas escaping and the problem of health damage to operators.

Description

Technical Field

[0001] This utility model relates to the field of chemical waste gas treatment technology, specifically to a closed-loop collection device for hydrogen sulfide gas escaping from a liquid sodium hydrosulfide storage tank. Background Technology

[0002] The hydrogen sulfide waste acid treatment system mainly prepares hydrogen sulfide gas by reacting sodium hydrosulfide solution with concentrated sulfuric acid solution. The hydrogen sulfide gas and the waste acid raw solution undergo a sulfidation reaction in a sulfidation reaction tank, thereby removing trivalent arsenic (As) from the waste acid raw solution. 3+ The reaction directly generates a black precipitate of arsenic trisulfide (As2S3), which efficiently removes arsenic from the raw acid solution.

[0003] Currently, the liquid sodium hydrosulfide storage tanks in the system produce small amounts of hydrogen sulfide gas during the storage of liquid sodium hydrosulfide. Hydrogen sulfide gas is an acutely toxic substance with a rotten egg smell. Low concentrations of hydrogen sulfide can affect the eyes, respiratory system, and central nervous system, while inhalation of even small amounts of high concentrations can be fatal within a short time. The hydrogen sulfide gas generated in the currently operational liquid sodium hydrosulfide storage tanks is directly discharged into the air through a breather valve on the top of the tank. This poses both an environmental pollution risk and a potential safety hazard, as it can easily cause acute poisoning accidents for personnel on duty. Utility Model Content

[0004] The purpose of this invention is to provide a closed-loop collection device for hydrogen sulfide gas escaping from a liquid sodium hydrosulfide storage tank, which can perfectly collect hydrogen sulfide gas in the liquid sodium hydrosulfide storage tank of a hydrogen sulfide waste acid treatment system, thereby solving the problems existing in the prior art.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A closed-loop collection device for hydrogen sulfide gas escaping from a liquid sodium hydrosulfide storage tank includes a liquid sodium hydrosulfide storage tank 1, a secondary purging tower 2, and a purging fan 3. A pipe a4 is installed at the breather valve at the top of the liquid sodium hydrosulfide storage tank 1. The outlet end of the pipe a4 is connected to the inlet end of the purging fan 3. A PTFE-lined ball valve 5 is installed on the pipe a4. The outlet end of the purging fan 3 is connected to a pipe b6, and the outlet end of the pipe b6 is located inside the secondary purging tower 2.

[0007] Pipe a4 is a DN100 steel-reinforced composite pipe.

[0008] A spray assembly is installed above the outlet of pipe b6 inside the secondary pollution control tower 2. The spray assembly sprays and washes the hydrogen sulfide gas coming out of pipe b6 with sodium hydroxide solution.

[0009] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0010] This invention is simple to manufacture and low in cost, yet it plays a very good role. By setting up a steel-framed composite pipeline, a steel-lined PTFE ball valve, and a purifying fan, it perfectly achieves the desired effect, and can completely solve the risk of hydrogen sulfide gas leakage causing environmental pollution and the problem of damage to the health of operators. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] In the diagram: 1. Liquid sodium hydrosulfide storage tank; 2. Secondary septic tank; 3. Septic fan; 4. Pipeline a; 5. Steel-lined PTFE ball valve; 6. Pipeline b. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., 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.

[0016] Example 1

[0017] like Figure 1As shown, this embodiment provides a closed-loop collection device for hydrogen sulfide gas escaping from a liquid sodium hydrosulfide storage tank, including a liquid sodium hydrosulfide storage tank 1, a secondary filtration tower 2, and a filtration fan 3. A pipe a4 is installed at the top breather valve of the liquid sodium hydrosulfide storage tank 1. Pipe a4 is a DN100 steel-reinforced composite pipe. The outlet end of pipe a4 is connected to the inlet end of the filtration fan 3. A DN100 steel-lined PTFE ball valve 5 is installed on pipe a4. The outlet end of the filtration fan 3 is connected to pipe b6, and the outlet end of pipe b6 is located inside the secondary filtration tower 2.

[0018] A spray assembly is installed above the outlet of pipe b6 inside the secondary pollution control tower 2. The spray assembly washes the hydrogen sulfide gas exiting from pipe b6 with sodium hydroxide solution. The spray assembly includes a spray plate with multiple nozzles. The nozzles of the spray assembly are connected to a sodium hydroxide solution tank through pipes and a pump.

[0019] The working principle of this utility model is as follows: A DN100 steel-framed composite pipe is connected to the breather valve at the top of the liquid sodium hydrosulfide storage tank, and connected to the inlet end of the purging fan of the hydrogen sulfide waste acid treatment system. At the same time, a DN100 steel-lined PTFE ball valve is installed on the steel-framed composite pipe to adjust the negative pressure suction force. Relying on the suction force of the large negative pressure at the inlet end of the purging fan, the hydrogen sulfide gas escaping from the liquid sodium hydrosulfide storage tank is sent to the secondary purging tower, and then the hydrogen sulfide gas is removed by spraying and washing with sodium hydroxide solution in the secondary purging tower.

[0020] In this utility model, the secondary pest control tower and the pest control fan are both existing equipment in the factory area and are also available for purchase on the market. Their detailed structures will not be described in detail here.

Claims

1. A closed-loop collection device for hydrogen sulfide gas escaping from a liquid sodium hydrosulfide storage tank, comprising a liquid sodium hydrosulfide storage tank (1), a secondary purging tower (2), and a purging fan (3), characterized in that, The liquid sodium hydrosulfide storage tank (1) is equipped with a pipe a (4) at the top of the breather valve. The outlet end of the pipe a (4) is connected to the inlet end of the purifying fan (3). A steel-lined PTFE ball valve (5) is installed on the pipe a (4). The outlet end of the purifying fan (3) is connected to a pipe b (6). The outlet end of the pipe b (6) is located inside the secondary purifying tower (2).

2. The closed-loop collection device for hydrogen sulfide gas escaping from a liquid sodium hydrosulfide storage tank according to claim 1, characterized in that: The pipeline a(4) is a DN100 steel-reinforced composite pipeline.

3. The closed-loop collection device for hydrogen sulfide gas escaping from a liquid sodium hydrosulfide storage tank according to claim 1, characterized in that: The secondary hazard removal tower (2) is equipped with a spray assembly above the outlet of pipe b (6). The spray assembly sprays and washes the hydrogen sulfide gas coming out of pipe b (6) with sodium hydroxide solution.

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