Acidic water stripping device deamination system

Abstract

The utility model belongs to the technical field of petrochemical equipment, and particularly relates to a deamination system of an acidic water stripping device, which comprises a tail gas quench tower and a washing deamination tower, a tower bottom liquid outlet of the tail gas quench tower is connected to a tower top liquid inlet of the tail gas quench tower through a circulating pipeline, the circulating pipeline is sequentially connected with a quench tower bottom circulating pump, a quench tower air cooler and a quench tower heat exchanger, and the circulating pipeline is connected with a quench water outlet pipeline between the quench tower air cooler and the quench tower heat exchanger. The quenched water outlet pipeline is connected to a liquid inlet of the washing deamination tower through a first branch line, and is connected to an inlet of the acidic water storage tank through a second branch line. The demineralized water for deamination of the water washing deamination tower is replaced by quenched water produced by the sulfur recovery device, and the ammonia-containing non-condensable gas enters the water washing deamination tower for deamination, so that the emission requirement is met, the treatment capacity of the device is reduced, and the purposes of reducing cost and improving efficiency are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of petrochemical equipment, and in particular relates to a deammoniation system of an acidic water stripping device. Background Art

[0002] Acidic water containing sulfide and ammonia nitrogen is a common type of sewage. Acidic water is corrosive and can damage equipment and pipes, so the acidic water needs to be treated in a timely manner. At the same time, incomplete treatment of acidic water can also cause environmental pollution.

[0003] The acidic water is usually treated by steam stripping, and the non-condensable gas is deaminated by water washing. This process requires a large amount of desalted water to absorb ammonia, and the consumption of desalted water is huge. Therefore, a method is needed to solve the problem of deammoniation of non-condensable gas by using system raw materials. Summary of the invention

[0004] In view of the defects of the above-mentioned prior art, the purpose of the utility model is to provide a deamination system for an acidic water stripping device, in which the deamination water used in the water washing deamination tower of the acidic water stripping device is replaced by quenching water produced by the sulfur recovery device, thereby reducing the load of the device.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a deamination system of an acidic water stripping device, comprising a tail gas quenching tower and a water washing deamination tower, sulfur tail gas is introduced into the tail gas quenching tower through a tail gas pipeline for cooling, the bottom liquid outlet of the tail gas quenching tower is connected to the top liquid inlet of the tail gas quenching tower through a circulation pipeline, the bottom circulation pump of the quenching tower, the quenching tower air cooler and the quenching tower heat exchanger are connected to the circulation pipeline in sequence, the circulation pipeline is connected to the quenching water outlet pipeline between the quenching tower air cooler and the quenching tower heat exchanger, the quenching water outlet pipeline is connected to the liquid inlet of the water washing deamination tower through a first branch line, and the quenching water outlet pipeline is connected to the inlet of the acidic water storage tank through a second branch line.

[0006] Furthermore, a first regulating valve is provided on the quench water outlet pipeline.

[0007] Furthermore, the liquid inlet of the water washing and deammonification tower is connected to a desalted water inlet pipeline, and a second regulating valve is arranged on the desalted water inlet pipeline.

[0008] Furthermore, the outlet of the first branch line is connected to the demineralized water inlet pipeline, and the outlet of the first branch line is connected to the back path of the second regulating valve.

[0009] Furthermore, the first branch line and the second branch line are respectively provided with regulating valve groups for controlling pipeline on-off and flow.

[0010] Furthermore, the quenching water flow rate in the first branch line for deammoniation in the water-washing deammonification tower is 10-17 t / h.

[0011] Furthermore, the ammonia-containing non-condensable gas enters the gas inlet of the water-washing deammonification tower through the non-condensable gas pipeline, and the deammonification tower top outlet pipeline of the water-washing deammonification tower is connected to the ammonia liquid deodorization tower.

[0012] Furthermore, the bottom outlet of the water washing deamination tower is connected to a deamination tower bottom circulation pump, the outlet of the deamination tower bottom circulation pump is connected to the liquid inlet of the water washing deamination tower through a first outlet pipeline, and the outlet of the deamination tower bottom circulation pump is connected to the acidic water storage tank through a second outlet pipeline.

[0013] Furthermore, a quench tower top outlet pipeline at the top of the tail gas quench tower is connected to a tail gas absorption tower.

[0014] The beneficial effects of the utility model are as follows: the acidic water stripping device replaces the deionized water used for deammoniation in the water washing deammonification tower with quench water produced by the sulfur recovery device, the ammonia-containing non-condensable gas flashed out from the acidic water storage tank enters the water washing deammonification tower for deammoniation to meet the emission requirements, and the existing raw materials are used to solve the deammoniation problem of the flash non-condensable gas in the acidic water storage tank, thereby reducing the processing capacity of the device, reducing the load of the device, and achieving the purpose of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a process flow chart of the deammoniation system of the sour water stripping device of the utility model;

[0016] In the figure: 1. tail gas quenching tower, 2. water washing deamination tower, 3. tail gas pipeline, 4. circulation pipeline, 5. circulation pump at the bottom of the quenching tower, 6. air cooler of the quenching tower, 7. heat exchanger of the quenching tower, 8. quenching water outlet pipeline, 9. first branch line, 10. second branch line, 11. first regulating valve, 12. demineralized water inlet pipeline, 13. second regulating valve, 14. non-condensable gas pipeline, 15. deamination tower top outlet pipeline, 16. deamination tower bottom circulation pump, 17. first outlet pipeline, 18. second outlet pipeline, 19. quenching tower top outlet pipeline. DETAILED DESCRIPTION

[0017] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0018] The utility model provides a new solution for energy saving and consumption reduction of an acidic water stripping device. The original process flow design of the acidic water stripping device is that 14.5-53t / h of quench water produced by sulfur enters the acidic water storage tank of the acidic water stripping device, and then enters the acidic water stripping tower; the ammonia-containing non-condensable gas flashed out from the top of the acidic water storage tank enters the water washing and ammonia removal tower, and the demineralized water after absorbing ammonia with 10-17t / h of demineralized water enters the acidic water storage tank. Because the sulfur quench water does not contain ammonia, it can be used to replace the deammoniation water of the water washing and ammonia removal tower, thereby reducing the processing capacity of the acidic water stripping device. For specific processes, please refer to the attached Figure 1 A deamination system for an acidic water stripping device comprises a tail gas quenching tower 1 and a water washing deamination tower 2, wherein sulfur tail gas is introduced into the tail gas quenching tower 1 through a tail gas pipeline 3 for cooling, wherein the quenching tower top outlet pipeline at the top of the tail gas quenching tower 1 is connected to a tail gas absorption tower, and the bottom liquid outlet of the tail gas quenching tower 1 is connected to the top liquid inlet of the tail gas quenching tower 1 through a circulation pipeline 4, wherein the circulation pipeline 4 is sequentially connected with a quenching tower bottom circulation pump 5, a quenching tower air cooler 6 and a quenching tower heat exchanger 7, wherein the circulation pipeline 4 is connected with a quenching water outlet pipeline 8 between the quenching tower air cooler 6 and the quenching tower heat exchanger 7, wherein a first regulating valve 11 is arranged on the quenching water outlet pipeline 8, and the quenching water outlet pipeline 8 is connected to a liquid inlet of the water washing deamination tower 2 through a first branch line 9, and the quenching water outlet pipeline 8 is connected to an acidic water storage tank inlet through a second branch line 10. The first branch line 9 and the second branch line 10 are respectively provided with regulating valve groups (not shown in the figure) for controlling the on-off and flow of the pipelines.

[0019] In the above technical scheme, the desalted water used for deammoniation in the water-washing deammonification tower with a pressure of 0.5-0.8MPa and a flow rate of 10-17t / h is replaced by quenching water produced by the sulfur recovery device. The quenching water after passing through the water-washing deammonification tower enters the acidic water storage tank. The ammonia-containing non-condensable gas flashed out from the acidic water storage tank passes through the water-washing deammonification tower, and the ammonia is completely absorbed.

[0020] In the above technical scheme, the acidic water stripping device saves 10-17t / h of 0.5-0.8MPa desalted water, the processing capacity of the acidic water stripping device decreases by 10-17t / h, and saves 1.3-3t / h of 0.45MPa steam.

[0021] Based on the above technical solution, the water washing deammonification tower needs to be supplemented with 10-17t / h of demineralized water with a pressure of 0.5-0.8MPa for deammonification during normal production of the sour water stripping unit. The sulfur recovery workshop uses a Duke ammonia burning burner. The ammonia in the acid gas is completely converted into nitrogen in the sulfur making furnace. The reaction process does not contain ammonia. Therefore, the sulfur recovery unit produces 14.5-53t / h of ammonia-free quench water at a pressure of 0.6MPa during normal production. Using the quench water of the sulfur recovery unit to replace the water washing deammonification tower to supplement the demineralized water and the air cooling anti-corrosion water injection of the stripping tower can save 10-17t / h of demineralized water, reduce the processing capacity of the sour water stripping tower by 10-17t / h, and save 1.3-3t / h of 0.45MPa steam. The utility model utilizes sulfur to produce quench water to replace 10-17 t / h of desalted water used in a water-washing deammonification tower. After the non-condensable gas is deaminated by the water-washing deammonification tower, all ammonia is absorbed to meet the need of discharging the non-condensable gas to the flare.

[0022] Furthermore, the liquid inlet of the water washing deammonification tower 2 is connected to a deionized water inlet pipeline 12, and a second regulating valve 13 is provided on the deionized water inlet pipeline 12. The outlet of the first branch line 9 is connected to the deionized water inlet pipeline 12, and the outlet of the first branch line 9 is connected to the back of the second regulating valve 13.

[0023] Furthermore, the quenching water flow rate in the first branch line 9 for deammoniation in the water-washing deammonification tower is 10-17 t / h.

[0024] Based on the above technical solution, when the quenching water flow rate at the outlet of the tail gas quenching tower 1 (the flow rate of the quenching water outlet pipeline 8) is greater than the quenching water flow rate for deammoniation preset in the first branch line 9, the valve of the second branch line 10 is opened to send part of the quenching water to the acidic water storage tank.

[0025] Furthermore, the ammonia-containing non-condensable gas enters the gas inlet of the water-washing and deammonification tower 2 through the non-condensable gas pipeline 14, and the deammonification tower top outlet pipeline 15 of the water-washing and deammonification tower 2 is connected to the ammonia liquid deodorization tower.

[0026] Furthermore, the bottom outlet of the water washing deamination tower 2 is connected to a deamination tower bottom circulation pump 16, the outlet of the deamination tower bottom circulation pump 16 is connected to the liquid inlet of the water washing deamination tower through a first outlet pipeline 17, and the outlet of the deamination tower bottom circulation pump 16 is connected to the acidic water storage tank through a second outlet pipeline 18.

[0027] The acidic water stripping device replaces the desalted water used for deammoniation in the water washing deammonification tower with quench water produced by the sulfur recovery device. The non-condensable gas containing ammonia flashed out from the acidic water storage tank enters the water washing deammonification tower for deammoniation to meet the emission requirements, thus reducing the load of the device. The utility model uses existing raw materials to solve the problem of deammoniation of flash non-condensable gas in the acidic water storage tank, reduce the processing capacity of the device, and achieve the purpose of reducing costs and increasing efficiency.

[0028] It should be noted that the parts not described in detail in the present invention are prior art.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] The above examples are only the best embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there are many variations. All variations that can be directly derived or associated with the contents disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. A deamination system for a sour water stripping device, characterized in that: The invention comprises a tail gas quenching tower and a water washing and deammonification tower. The sulfur tail gas is introduced into the tail gas quenching tower through a tail gas pipeline for cooling. The bottom liquid outlet of the tail gas quenching tower is connected to the top liquid inlet of the tail gas quenching tower through a circulation pipeline. The circulation pipeline is sequentially connected with a bottom circulation pump of the quenching tower, a quenching tower air cooler and a quenching tower heat exchanger. The circulation pipeline is connected with a quenching water outlet pipeline between the quenching tower air cooler and the quenching tower heat exchanger. The quenching water outlet pipeline is connected to the liquid inlet of the water washing and deammonification tower through a first branch line. The quenching water outlet pipeline is connected to the inlet of the acidic water storage tank through a second branch line.

2. The deamination system of a sour water stripping device according to claim 1, characterized in that: The quench water outlet pipeline is provided with a first regulating valve.

3. The deamination system of a sour water stripping device according to claim 1, characterized in that: The liquid inlet of the water-washing and ammonia-removing tower is connected with a desalted water inlet pipeline, and a second regulating valve is arranged on the desalted water inlet pipeline.

4. The deamination system of a sour water stripping device according to claim 3, characterized in that: The outlet of the first branch line is connected to the demineralized water inlet pipeline, and the outlet of the first branch line is connected to the rear path of the second regulating valve.

5. The deamination system of a sour water stripping device according to claim 1, characterized in that: The first branch line and the second branch line are respectively provided with regulating valve groups for controlling the on-off and flow of the pipelines.

6. The deamination system of a sour water stripping device according to claim 1, characterized in that: The quenching water flow rate in the first branch line for deammoniation in the water-washing deammonification tower is 10-17 t / h.

7. The deamination system of a sour water stripping device according to claim 1, characterized in that: The non-condensable gas containing ammonia enters the gas inlet of the water-washing deammonification tower through the non-condensable gas pipeline, and the deammonification tower top outlet pipeline of the water-washing deammonification tower is connected to the ammonia liquid deodorization tower.

8. The deamination system of a sour water stripping device according to claim 1, characterized in that: The bottom outlet of the water-wash deamination tower is connected to a deamination tower bottom circulation pump, the outlet of the deamination tower bottom circulation pump is connected to the liquid inlet of the water-wash deamination tower through a first outlet pipeline, and the outlet of the deamination tower bottom circulation pump is connected to the acidic water storage tank through a second outlet pipeline.

9. The deamination system of a sour water stripping device according to claim 1, characterized in that: The tail gas quenching tower top outlet pipeline at the top of the tail gas quenching tower is connected to the tail gas absorption tower.

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