Online leakage eliminating device of ammonia cooler

Abstract

The utility model relates to the technical field of chemical production, in particular to an online leakage eliminating device of an ammonia cooler. Comprising an ammonia cooler, a circulating water inlet of the ammonia cooler is connected with a short section through a flange, the short section is connected with a circulating water pipeline through a butterfly valve, one side of the short section is connected with a nitrogen storage tank through a nitrogen pipeline, and the circulating water pipeline is connected with a sewage treatment pipeline; by opening the flush valve, supplementing the stop valve and closing the drain valve, nitrogen is supplemented to the circulating water side in the ammonia cooler, the pressure of the circulating water side is increased, the pressure of the circulating water side is kept not less than the pressure of the ammonia system side, and the leakage amount of ammonia can be effectively reduced under the condition that production is not stopped; after the circulating water of the ammonia heat exchanger is cut off, the circulating water containing ammonia nitrogen in the circulating water pipeline is discharged to the ammonia nitrogen treatment device for treatment along the sewage treatment pipeline by opening the discharge valve, so that the ammonia nitrogen index in the circulating water is ensured to be controllable, and non-stop production and non-pressurized leakage elimination of a production device are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to an online leakage elimination device for an ammonia cooler. Background Art

[0002] In the chemical production device, the refrigerant required for the low-temperature methanol washing unit is ammonia, and the ammonia compressor provides cooling capacity for the low-temperature methanol washing device. During long-term operation, ammonia causes scouring and corrosion to the cooler, causing internal leakage of the heat exchange tube in the ammonia cooler. Because the heat exchange method of the ammonia cooler is circulating water heat exchange, after the ammonia cooler leaks, the pressure on the ammonia system side is 1.5Mpa, and the pressure on the circulating water side is 0.6Mpa. Therefore, after the ammonia cooler leaks, ammonia will leak into the circulating water. The circulating water supply of the ammonia cooler in our factory is controlled by a butterfly valve (DN250). The butterfly valve is a single valve. After the ammonia cooler leaks, after the circulating water of this heat exchanger is cut off, the sealing effect of the butterfly valve is general, causing ammonia to leak into the circulating water through the circulating water supply butterfly valve, causing the ammonia index in the circulating water to increase. In the prior art, the method of plugging leaks with pressure is often used, or the leakage point is eliminated after the device is shut down, but the shutdown of the device is not conducive to production efficiency. If the device is to ensure that the device does not stop production, it is difficult to eliminate the leakage point with pressure. Therefore, an online leakage elimination device for ammonia cooler is proposed. Utility Model Content

[0003] The utility model aims at the deficiencies of the prior art and provides an online leakage elimination device for an ammonia cooler to solve the problems existing in the above-mentioned background technology.

[0004] In order to achieve the above technical objectives, the utility model proposes the following technical solutions: an online leakage elimination device for an ammonia cooler, comprising an ammonia cooler, a short section is connected to the circulating water inlet of the ammonia cooler through a flange, the short section is connected to a circulating water pipeline through a butterfly valve, one side of the short section is connected to a nitrogen storage tank through a nitrogen pipeline, and the circulating water pipeline is connected to a sewage treatment pipeline.

[0005] Furthermore, a backwash valve is provided on one end of the nitrogen pipeline close to the short section, a flow meter is also provided on the nitrogen pipeline, a flow meter inlet valve and a flow meter outlet valve are provided on both sides of the flow meter, and a discharge valve is provided on each of the sewage treatment pipelines.

[0006] Furthermore, a replenishing stop valve is provided on the nitrogen pipeline and between the backwash valve and the flow meter outlet valve, and a pressure gauge 1 and a pressure gauge 2 are provided on both sides of the replenishing stop valve.

[0007] Furthermore, an exhaust line is provided on the nitrogen pipeline and located on one side of the flow meter inlet valve, and a shower valve is provided on the exhaust line.

[0008] Furthermore, the ammonia outlet of the ammonia cooler is connected to an ammonia recovery tank through a recovery pipeline, a gas-liquid separator is arranged in the ammonia recovery tank, and ammonia and nitrogen are discharged to the ammonia flare burner through a venting pipeline on the ammonia recovery tank.

[0009] Furthermore, the ammonia cooler includes a heat exchange pipe fitting 1 and a heat exchange pipe fitting 2, wherein the heat exchange pipe fitting 1 is inserted into the heat exchange pipe fitting 2, and the heat exchange pipe fitting 1 and the heat exchange pipe fitting 2 each include two spiral round tubes, which are wound around each other to form a threaded structure, and one end of any round tube of the heat exchange pipe fitting 1 is connected to one end of any round tube of the heat exchange pipe fitting 2.

[0010] Compared with the prior art, the beneficial effects produced by the utility model are: the utility model has a novel structure, ingenious conception, simple and convenient operation, and has the following advantages compared with the prior art: the utility model opens the flushing valve, replenishes the stop valve, closes the shower valve, replenishes nitrogen to the circulating water side in the ammonia cooler, increases the pressure on the circulating water side, and maintains the pressure on the circulating water side not less than the pressure on the ammonia system side, which can effectively reduce the amount of ammonia leakage without stopping production; after cutting off the circulating water of the ammonia heat exchanger, the circulating water containing ammonia nitrogen in the circulating water pipeline is discharged along the sewage treatment pipeline to the ammonia nitrogen treatment device for treatment by opening the discharge valve, ensuring that the ammonia nitrogen index in the circulating water is controllable, and the production device can be eliminated without stopping production and without pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a structural schematic diagram of the ammonia cooler of the utility model.

[0013] In the figure, 1. ammonia cooler; 2. circulating water inlet; 3. flange; 4. short joint; 5. butterfly valve; 6. circulating water pipeline; 7. nitrogen pipeline; 8. nitrogen storage tank; 9. sewage treatment pipeline; 10. backwash valve; 11. flow meter; 12. flow meter inlet valve; 13. flow meter outlet valve; 14. discharge valve; 15. replenishment stop valve; 16. pressure gauge 1; 17. pressure gauge 2; 18. drain pipeline; 19. shower valve; 20. recovery pipeline; 21. ammonia recovery tank; 22. heat exchange pipe fitting 1; 23. heat exchange pipe fitting 2. DETAILED DESCRIPTION

[0014] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0015] like Figure 1 and 2As shown, the utility model provides an online leakage elimination device for an ammonia cooler, comprising an ammonia cooler 1, a circulating water inlet 2 of the ammonia cooler 1 is connected to a short section 4 via a flange 3, the short section 4 is connected to a circulating water pipeline 6 via a butterfly valve 5, one side of the short section 4 is connected to a nitrogen storage tank 8 via a nitrogen pipeline 7, and the circulating water pipeline 6 is connected to a sewage treatment pipeline 9.

[0016] like Figure 1 As shown, after the heat exchange tube of the ammonia cooler 1 leaks internally, the nitrogen in the nitrogen storage tank 8 is transported to the short section 4 along the nitrogen pipeline 7, and the nitrogen flows into the ammonia cooler 1 along the short section 4, so that the pressure on the circulating water side increases, and the pressure difference between the pressure on the circulating water side and the pressure on the ammonia system side is reduced, which can effectively control the leakage of ammonia. At the same time, when the butterfly valve 5 is closed, due to the poor sealing performance of the butterfly valve 5, the nitrogen added makes the pressure on the circulating water side in the ammonia cooler 1 greater than the pressure in the circulating water pipeline 6 at the other end of the butterfly valve 5. Therefore, the nitrogen and ammonia on the circulating water side in the ammonia cooler 1 will enter the circulating water pipeline 6 through the butterfly valve 5, and the sewage treatment pipeline 9 plays a role of pressure relief. Therefore, the nitrogen and ammonia entering the circulating water pipeline 6 will enter the sewage treatment pipeline 9, and the nitrogen and ammonia are transported along the sewage treatment pipeline 9 to the sewage treatment device for treatment.

[0017] A backwash valve 10 is provided on one end of the nitrogen pipeline 7 close to the short section 4, and a flow meter 11 is also provided on the nitrogen pipeline 7. A flow meter inlet valve 12 and a flow meter outlet valve 13 are provided on both sides of the flow meter 11. A discharge valve 14 is provided on each of the sewage treatment pipelines 9.

[0018] like Figure 1 As shown, since medium-pressure nitrogen (6.1 MPa) is transported into the nitrogen pipeline 7, the pressure of the nitrogen initially input is much greater than the pressure on the ammonia system side, and therefore the flow rate of nitrogen is controlled by the flow meter 11, the flow meter inlet valve 12 and the flow meter outlet valve 13; when no internal leakage occurs in the ammonia cooling method, the backwash valve 10 and the discharge valve 14 are closed, and circulating water is transported into the circulating water pipeline 7, so that the ammonia cooler 1 works normally.

[0019] A replenishing stop valve 15 is provided on the nitrogen pipeline 7 and between the backwash valve 10 and the flow meter outlet valve 13 , and a pressure gauge 1 16 and a pressure gauge 2 17 are provided on both sides of the replenishing stop valve 15 .

[0020] like Figure 1As shown, when the replenishing stop valve 15 is closed and the backwashing valve 10 is opened, the pressure gauge 17 measures the pressure value on the circulating water side. According to the pressure value on the circulating water side, the replenishing amount of nitrogen is controlled through the flow meter 11, the flow meter inlet valve 12 and the flow meter outlet valve 13, so that the amount of replenished nitrogen is greater than the leakage of ammonia in the ammonia cooler 1; when the replenishing stop valve 15 is opened and the backwashing valve 10 is closed, the pressure gauge 16 measures the pressure value of nitrogen on the nitrogen pipeline 7.

[0021] An exhaust pipeline 18 is provided on the nitrogen pipeline 7 and located on one side of the flow meter inlet valve 12 , and a drain valve 19 is provided on the exhaust pipeline 18 .

[0022] like Figure 1 As shown, when not in use, the drain valve 19 is used to drain the nitrogen on the nitrogen pipeline 7.

[0023] The ammonia outlet of the ammonia cooler 1 is connected to an ammonia recovery tank 21 through a recovery pipeline 20. A gas-liquid separator is arranged in the ammonia recovery tank 21. Ammonia and nitrogen are discharged to an ammonia flare burner through a venting pipeline on the ammonia recovery tank 21.

[0024] like Figure 1 As shown, an internal leakage occurs in the ammonia cooler 1. After nitrogen is supplemented, if the pressure on the circulating water side of the ammonia cooler 1 is greater than the pressure on the ammonia system side, excess nitrogen on the circulating water side will leak into the ammonia system side, and the excess nitrogen will enter the ammonia recovery tank 21 through the recovery pipeline 20. Since nitrogen is an inert gas, it will be discharged to the ammonia flare burner along with ammonia. The ammonia is burned and processed at the ammonia flare burner, and the nitrogen is directly discharged into the atmosphere without burning.

[0025] The ammonia cooler 1 includes a heat exchange pipe fitting 22 and a heat exchange pipe fitting 23. The heat exchange pipe fitting 22 is sleeved in the heat exchange pipe fitting 23, and the heat exchange pipe fitting 22 and the heat exchange pipe fitting 23 each include two spiral round tubes. The two spiral round tubes are intertwined to form a threaded structure. One end of any round tube of the heat exchange pipe fitting 22 is connected to one end of any round tube of the heat exchange pipe fitting 23.

[0026] like Figure 2As shown, the ammonia cooler 1 includes a tank body, on which an ammonia inlet, an ammonia outlet, a circulating water inlet 2 and a circulating water outlet are provided. The overall appearance structure of the ammonia cooler 1 belongs to the prior art and is not described in detail here. The difference between the ammonia cooler 1 and the prior art is that a heat exchange pipe fitting 22 and a heat exchange pipe fitting 23 are arranged in the tank body, the outer diameter of the heat exchange pipe fitting 22 with a threaded structure is smaller than the inner diameter of the heat exchange pipe fitting 23 with a threaded structure, and one end of any round tube of the heat exchange pipe fitting 22 is connected to one end of any round tube of the heat exchange pipe fitting 23. When in use, the circulating water enters into one of the round tubes of the heat exchange pipe fitting 22 from the circulating water inlet 2, enters into one of the round tubes of the heat exchange pipe fitting 23 along one of the round tubes of the heat exchange pipe fitting 22, and is then discharged through the circulating water outlet, thereby increasing the travel of the circulating water in the ammonia cooler 1, thereby enhancing the heat transfer performance.

[0027] A plurality of baffles are provided between the heat exchange pipe member 1 22 and the heat exchange pipe member 2 23 .

[0028] like Figure 2 As shown, the baffle is arranged in the tank body to change the flow direction of ammonia, increase the residence time of ammonia in the tank body, and improve the heat exchange effect.

[0029] Principle of use: When in use, determine whether the ammonia cooler 1 has internal leakage according to the amount of ammonia in the circulating water or the change in the liquid level of the ammonia recovery tank. If there is no internal leakage, close the backwash valve 10 and the discharge valve 14, and the ammonia cooler 1 works normally. When the heat exchange tube in the ammonia cooler 1 has internal leakage, open the backwash valve 10, add the stop valve 15, close the drain valve 19, and inject a proper amount of nitrogen into the short section 4. The nitrogen flows into the circulating water side of the ammonia cooler 1 along the short section 4, increasing the pressure on the circulating water side, so that the pressure on the circulating water side is equivalent to the pressure on the ammonia system side, which can effectively control the leakage of ammonia. If the supplemented nitrogen is excessive, the pressure on the circulating water side is greater than The pressure on the ammonia system side, excess nitrogen will enter the ammonia system side, and along with the ammonia discharged to the ammonia flare burner, the ammonia is burned and processed at the ammonia flare burner, and the nitrogen does not participate in the combustion and is directly discharged into the atmosphere; after closing the butterfly valve 5 and cutting off the circulating water of the heat exchanger, the nitrogen added makes the pressure on the circulating water side greater than the pressure in the circulating water pipeline 6 at the other end of the butterfly valve 5. Due to the poor sealing effect of the butterfly valve 5, the nitrogen and ammonia added will enter the circulating water pipeline 6 through the butterfly valve 5, and the ammonia and nitrogen entering the circulating water pipeline 6 will then enter the sewage treatment pipeline 9, and be discharged along the sewage treatment pipeline 9 to the sewage treatment device for subsequent treatment.

[0030] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. An online leakage elimination device for an ammonia cooler, comprising an ammonia cooler (1), characterized in that: The circulating water inlet (2) of the ammonia cooler (1) is connected to a short joint (4) via a flange (3); the short joint (4) is connected to a circulating water pipeline (6) via a butterfly valve (5); one side of the short joint (4) is connected to a nitrogen storage tank (8) via a nitrogen pipeline (7); and the circulating water pipeline (6) is connected to a sewage treatment pipeline (9).

2. The online leakage elimination device for an ammonia cooler according to claim 1 is characterized in that: A backwash valve (10) is provided at one end of the nitrogen pipeline (7) close to the short joint (4), a flow meter (11) is also provided on the nitrogen pipeline (7), and a flow meter inlet valve (12) and a flow meter outlet valve (13) are provided on both sides of the flow meter (11), and a discharge valve (14) is provided on the sewage treatment pipeline (9).

3. The online leakage elimination device for an ammonia cooler according to claim 2 is characterized in that: A replenishment stop valve (15) is provided on the nitrogen pipeline (7) and between the backwash valve (10) and the flow meter outlet valve (13), and a pressure gauge 1 (16) and a pressure gauge 2 (17) are provided on both sides of the replenishment stop valve (15).

4. The online leakage elimination device for an ammonia cooler according to claim 2 is characterized in that: An exhaust pipeline (18) is provided on the nitrogen pipeline (7) and located on one side of the flow meter inlet valve (12), and a drain valve (19) is provided on the exhaust pipeline (18).

5. The online leakage elimination device for an ammonia cooler according to claim 1 is characterized in that: The ammonia outlet of the ammonia cooler (1) is connected to an ammonia recovery tank (21) via a recovery pipeline (20). A gas-liquid separator is provided in the ammonia recovery tank (21). Ammonia and nitrogen are discharged from the ammonia recovery tank (21) to an ammonia flare burner via a venting pipeline.

6. The online leakage elimination device for an ammonia cooler according to claim 1, characterized in that: The ammonia cooler (1) comprises a heat exchange pipe fitting 1 (22) and a heat exchange pipe fitting 2 (23), wherein the heat exchange pipe fitting 1 (22) is sleeved inside the heat exchange pipe fitting 2 (23), and the heat exchange pipe fitting 1 (22) and the heat exchange pipe fitting 2 (23) each comprise two spiral round tubes, the two spiral round tubes being intertwined to form a threaded structure, and one end of any round tube of the heat exchange pipe fitting 1 (22) is connected to one end of any round tube of the heat exchange pipe fitting 2 (23).

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