Hydrogen sulfide tail gas treatment device

Abstract

The utility model relates to a hydrogen sulfide tail gas treatment device which comprises a first treatment chamber, and the first treatment chamber comprises an absorption tower and an absorption tower circulating pump; the second treatment chamber comprises a first-stage desorption tower feeding preheater, a first-stage desorption tower, a first-stage desorption tower top condenser, a first-stage desorption tower top gas-liquid separator and a first-stage desorption tower circulating pump; and the third treatment chamber is connected with the second treatment chamber and comprises a second-stage desorption tower, a second-stage desorption tower top condenser, a second-stage desorption tower top gas-liquid separator and a second-stage desorption tower circulating pump. Through mutual cooperation of the first treatment chamber, the second treatment chamber and the third treatment chamber, hydrogen sulfide tail gas is treated, hydrogen sulfide is recycled while standard emission of the hydrogen sulfide tail gas is achieved, and resource waste is avoided; the treatment device is few in related units, high in adaptability, capable of achieving efficient recovery and easy to operate and control.

Description

Technical Field

[0001] The utility model belongs to the technical field of tail gas treatment, and particularly relates to a hydrogen sulfide tail gas treatment device. Background Art

[0002] In the process of industrial production of dimethyl sulfide and methanethiol, tail gas containing a certain concentration of hydrogen sulfide (H2S) is generated. In addition to hydrogen sulfide, the tail gas also contains components such as carbon monoxide (CO), hydrogen (H2), thioether, and mercaptan. As a major air pollutant, sulfur dioxide has received extensive attention. Controlling pollution and reducing sulfur dioxide emissions are important tasks for achieving sustainable social development.

[0003] The existing treatment devices involve many units, and it is impossible to achieve efficient recovery and utilization of the tail gas, thus affecting the overall treatment efficiency and increasing the enterprise cost. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a hydrogen sulfide tail gas treatment device, which has the advantage of high treatment efficiency.

[0005] To achieve the above object, the technical solution of the utility model is as follows:

[0006] A hydrogen sulfide tail gas treatment device includes: a first treatment chamber, the first treatment chamber includes: an absorption tower, an absorption tower circulation pump connected to the absorption tower; a second treatment chamber, the second treatment chamber includes a first-stage desorption tower feed preheater connected to the first treatment chamber, a first-stage desorption tower connected to the first-stage desorption tower feed preheater, a first-stage desorption tower top condenser connected to the first-stage desorption tower, a first-stage desorption tower top gas-liquid separator connected to the first-stage desorption tower top condenser, a first-stage desorption tower circulation pump connected to the first-stage desorption tower top gas-liquid separator; and a third treatment chamber connected to the second treatment chamber, the third treatment chamber includes: a second-stage desorption tower, a second-stage desorption tower top condenser connected to the second-stage desorption tower, a second-stage desorption tower top gas-liquid separator connected to the second-stage desorption tower top condenser, a second-stage desorption tower circulation pump connected to the second-stage desorption tower top gas-liquid separator.

[0007] As a preferred solution of the utility model, the absorption tower uses low-temperature methanol as the absorbent.

[0008] By implementing the above technical solution, low-temperature methanol absorbs hydrogen sulfide (H2S), carbon monoxide (CO), hydrogen (H2), thioether, and mercaptan in the tail gas.

[0009] As a preferred embodiment of the present utility model, the first circulation treatment chamber includes: a primary desorption tower, a primary top circulation pump connected to the primary desorption tower, and a primary desorption tower top condenser connected to the primary top circulation pump. The primary desorption tower adopts a pressurized distillation process, and the distillation pressure of the primary desorption tower is controlled at 1.5 - 2.0 Mpa.

[0010] To achieve the above technical solution, through the pressurized distillation process, components such as CO, H2, and H2S can be desorbed in stages.

[0011] As a preferred embodiment of the present utility model, the distillation pressure of the secondary desorption tower is controlled at 0.4 - 0.8 Mpa.

[0012] To achieve the above technical solution, the H2S component is desorbed through the secondary desorption tower.

[0013] In summary, the present utility model has the following beneficial effects:

[0014] 1. Through the mutual cooperation of the first treatment chamber, the second treatment chamber, and the third treatment chamber, the hydrogen sulfide tail gas is treated. While achieving the up-to-standard discharge of the hydrogen sulfide tail gas, the hydrogen sulfide is recycled and utilized, avoiding resource waste.

[0015] 2. The treatment device involved in the present utility model has few units, strong adaptability, realizes efficient recovery, and is easy to operate and control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a structural schematic diagram of the present utility model.

[0018] The corresponding component names represented by the numbers and letters in the figure:

[0019] 1. Absorption tower; 2. Absorption tower circulation pump; 3. Primary desorption tower feed preheater; 4. Primary desorption tower; 5. Primary desorption tower circulation pump; 6. Primary desorption tower top condenser; 7. Primary top gas-liquid separator; 8. Secondary desorption tower; 9. Secondary desorption tower circulation pump; 10. Secondary desorption tower top gas-liquid separator; 11. Secondary desorption tower top condenser. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Embodiment

[0022] As Figure 1 shown, a hydrogen sulfide tail gas treatment device includes: a first treatment chamber, the first treatment chamber includes: an absorption tower 1, an absorption tower 1 circulation pump connected to the absorption tower 1; a second treatment chamber, the second treatment chamber includes a primary desorption tower 4 feed preheater 3 connected to the first treatment chamber, a primary desorption tower 4 connected to the primary desorption tower 4 feed preheater 3, a primary desorption tower 4 top condenser connected to the primary desorption tower 4, a primary desorption tower 4 top gas-liquid separator connected to the primary desorption tower 4 top condenser, a primary desorption tower 4 circulation pump connected to the primary desorption tower 4 top gas-liquid separator; and a third treatment chamber connected to the second treatment chamber, the third treatment chamber includes: a secondary desorption tower 8, a secondary desorption tower 8 top condenser connected to the secondary desorption tower 8, a secondary desorption tower 8 top gas-liquid separator connected to the secondary desorption tower 8 top condenser, a secondary desorption tower 8 circulation pump connected to the secondary desorption tower 8 top gas-liquid separator.

[0023] The absorption tower 1 uses low-temperature methanol as an absorbent to absorb components such as hydrogen sulfide (H2S), carbon monoxide (CO), hydrogen (H2), thioether, and mercaptan in the tail gas.

[0024] The primary desorption tower 4 uses a pressurized distillation process, and the distillation pressure of the primary desorption tower 4 is controlled at 1.5 - 2.0 Mpa, mainly desorbing components such as CO and H2. The primary desorption tower top condenser 6 is connected to a primary tower top gas-liquid separator 77.

[0025] The distillation pressure of the secondary desorption tower 8 is controlled at 0.4 - 0.8 Mpa, mainly desorbing components such as H2S.

[0026] The treatment process is as follows: The tail gas containing hydrogen sulfide is sent into the absorption tower 1 through a delivery fan, and fully contacts with the cooled methanol to remove the organic matter therein. The hydrogen sulfide content in the eluted tail gas is less than 5 ppm and can be sent for combustion treatment. The bottom liquid of the tower is taken out by the absorption tower 1 circulation pump, part of it enters the absorption tower 1 for recycling, and part of it is taken out for treatment in the desorption tower.

[0027] The absorption liquid is preheated and then sent to the first-stage desorption tower 4. The vapor phase at the top of the tower enters the vapor-liquid separator of the first-stage desorption tower 4 after condensation. The liquid phase is pumped to the top circulation of the first-stage desorption tower 4. The vapor phase, such as the recovered syngas, is returned to the process for use. The liquid withdrawn from the bottom of the tower is sent to the second-stage desorption tower 8 for further treatment.

[0028] The liquid withdrawn from the bottom of the first-stage desorption tower 4 is sent to the second-stage desorption tower 8 for rectification treatment. The vapor phase at the top of the tower enters the vapor-liquid separator of the second-stage desorption tower 8 after condensation. The liquid phase is pumped to the top circulation of the second-stage desorption tower 8. The vapor phase, such as the recovered hydrogen sulfide, is returned to the process for use.

[0029] The liquid withdrawn from the bottom of the tower is mainly methanol, which can be returned to the absorption tower 1 for recycling. The temperature of the methanol after cooling is -10°C to 0°C. The absorption tower 1 adopts the method of pressure swing adsorption, and the pressure of the absorption tower 1 is 0.3 - 0.5 MPa.

[0030] Through the mutual cooperation of the first treatment chamber, the second treatment chamber, and the third treatment chamber, the hydrogen sulfide tail gas is treated. While achieving the up-to-standard discharge of the hydrogen sulfide tail gas, the hydrogen sulfide is recovered and utilized, avoiding waste of resources. The treatment device involved has few units, strong adaptability, realizes efficient recovery, and is easy to operate and control.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can 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 these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydrogen sulfide tail gas treatment device, characterized in that: include: A first treatment chamber, the first treatment chamber comprising: an absorption tower (1), and an absorption tower circulation pump (2) connected to the absorption tower; a second treatment chamber, the second treatment chamber comprising a primary desorption tower feed preheater (3) connected to the first treatment chamber, a primary desorption tower (4) connected to the primary desorption tower feed preheater, a primary desorption tower top condenser (6) connected to the primary desorption tower, a primary desorption tower top gas-liquid separator (7) connected to the primary desorption tower top condenser, and a primary desorption tower circulation pump (5) connected to the primary desorption tower top gas-liquid separator (7); And, a third treatment chamber connected to the second treatment chamber, the third treatment chamber comprising: a secondary desorption tower (8), a secondary desorption tower top condenser (11) connected to the secondary desorption tower, a secondary desorption tower top gas-liquid separator (10) connected to the secondary desorption tower top condenser, and a secondary desorption tower circulation pump (9) connected to the secondary desorption tower top gas-liquid separator (10).

2. A hydrogen sulfide tail gas treatment device according to claim 1, characterized in that: The absorption tower (1) uses low-temperature methanol as absorbent.

3. A hydrogen sulfide tail gas treatment device according to claim 1, characterized in that: The first-stage desorption tower (4) in the second treatment chamber adopts a pressurized distillation process, and the distillation pressure of the first-stage desorption tower (4) is controlled at 1.5-2.0Mpa.

4. A hydrogen sulfide tail gas treatment device according to claim 3, characterized in that: The first-stage desorption tower top condenser (6) is connected to a first-stage tower top gas-liquid separator (7).

5. A hydrogen sulfide tail gas treatment device according to claim 1, characterized in that: The distillation pressure of the secondary desorption tower (8) in the third treatment chamber is controlled at 0.4-0.8Mpa.

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