Automatic ammonia leakage control device

Abstract

The utility model relates to a kind of ammonia leakage automatic control device, and the utility model relates to a kind of ammonia leakage automatic control device, including ammonia gas pipeline, nitrogen pipeline and water pipeline, it is characterized in that, the ammonia gas pipeline includes the ammonia gas stop valve, ammonia gas electric cut-off valve, ammonia gas check valve and ammonia gas pressure transmitter connected in turn by ammonia gas pipeline, ammonia gas pipeline is connected with ammonia gas source on one end, and the other end of ammonia gas pipeline is communicated with the equipment to be detected;The nitrogen pipeline includes the nitrogen stop valve, nitrogen electric cut-off valve, nitrogen check valve and nitrogen pressure transmitter connected in turn by nitrogen pipeline;The utility model is transmitted to electric cut-off valve by pressure transmitter and electric signal, so that electric cut-off valve acts, to reach the purpose of controlling container internal gas pressure, to reduce the labor intensity of operator and improve the accuracy of test result.

Description

Technical Field

[0001] This utility model relates to the technical field of testing the sealing performance of pressurization equipment after its manufacture, and specifically to an automatic control device for ammonia leakage. Background Technology

[0002] The rapid development of the chemical industry has placed higher demands on the capacity of single-unit facilities. To meet the industry's requirements for energy storage in single units, the equipment in these facilities is becoming larger and heavier, while the media they handle are becoming more complex, with highly hazardous and extremely dangerous media being used frequently. According to relevant national standards, such equipment needs to undergo an airtightness test after passing the pressure test. Ammonia is a preferred choice due to its low production cost and high detection sensitivity. However, safety during the testing process is paramount because ammonia is harmful to human health.

[0003] Ammonia leakage tests require a mixture of ammonia and nitrogen gases. The appropriate gas is introduced according to the test pressure and the volume percentage of the mixture, and each gas must be maintained at a specific pressure within the container. During the filling process, operators need to constantly monitor the amount of gas introduced and the changes in the internal pressure of the container, which significantly increases the operator's workload and reduces the accuracy of the test results.

[0004] Before starting the ammonia leak test, the air inside the equipment needs to be replaced to prevent an explosion caused by the mixing of ammonia and air. The entire ammonia leak test process involves first introducing ammonia gas, and then introducing nitrogen gas once a certain volume and pressure are reached. After the nitrogen gas is introduced, the test pressure value is reached, and then the pressure is maintained according to the design documents. The entire ammonia leak test process is lengthy, and a gas conversion and filling process is required before maintaining the pressure. The pressure value of the container after the entire gas is filled into the equipment plays a decisive role in the accuracy of the test results. Therefore, accurately ensuring the gas volume and pressure before maintaining the pressure during the entire test is crucial to guaranteeing the accuracy of the test results. Utility Model Content

[0005] To address the aforementioned problems, this utility model provides an automatic ammonia leakage control device that improves gas utilization during ammonia leakage testing, reduces the labor intensity of operators, and enhances the accuracy of the overall test results.

[0006] This utility model discloses an automatic control device for ammonia leakage, including an ammonia pipeline, a nitrogen pipeline and a water pipeline. The ammonia pipeline includes an ammonia shut-off valve, an ammonia electric shut-off valve, an ammonia check valve and an ammonia pressure transmitter connected in sequence through the ammonia pipeline. One end of the ammonia pipeline is connected to an ammonia gas source, and the other end of the ammonia pipeline is connected to the equipment to be tested. The nitrogen pipeline includes a nitrogen shut-off valve, a nitrogen electric shut-off valve, a nitrogen check valve, and a nitrogen pressure transmitter connected in sequence through the nitrogen pipeline. One end of the nitrogen pipeline is connected to a nitrogen source, and the other end of the nitrogen pipeline is connected to the equipment under test. The water pipeline includes a water tank, which is connected to the equipment under test via a water circuit shut-off valve and a water circuit check valve.

[0007] Preferably, the ammonia or nitrogen gas source is connected to an automatic gas switching device via a pressurization pump, and the automatic gas switching device is connected to the ammonia branch and the nitrogen branch via an intermediate pipeline. The nitrogen branch and the end of the nitrogen branch furthest from the automatic gas switching device are both connected to the air inlet of the equipment under test. The ammonia shut-off valve, ammonia electric shut-off valve, ammonia check valve, and ammonia pressure transmitter are all installed on the ammonia branch line. The nitrogen shut-off valve, nitrogen electric shut-off valve, nitrogen check valve, and nitrogen pressure transmitter shown are all installed on the nitrogen branch.

[0008] Preferably, flow meters are installed on both the ammonia branch and the nitrogen branch.

[0009] Preferably, the equipment to be inspected has two air inlets, namely a first air inlet and a second air inlet. Both the nitrogen branch and the ammonia branch are seamless steel pipes. The nitrogen branch is connected to the first air inlet through a flange, and the ammonia branch is connected to the second air inlet through a flange.

[0010] Preferably, it also includes a connecting pipeline, one end of which is connected to the first air inlet via a flange, and the other end of which is connected to the end of the nitrogen branch connected to the first air inlet; The end of the water pipe furthest from the water tank is connected to the main pipe.

[0011] This invention uses a pressure transmitter to transmit electrical signals to an electric shut-off valve, thereby actuating the valve to control the internal gas pressure of the container. This reduces the workload of operators and improves the accuracy of test results.

[0012] This invention sets a gas pressure in an automatic gas switching device so that when the gas pressure in the pipeline is lower than the set pressure, the device automatically switches to fill another gas bottle, thus achieving uninterrupted gas filling and improving the efficiency of the experiment.

[0013] This invention improves the utilization rate of gas during ammonia leakage testing, enables more accurate identification of the pressure of gas inside the container, reduces the labor intensity of operators, shortens the gas replacement time after the ammonia leakage test is passed by dissolving some ammonia in water, shortens the duration of the entire test process, improves the accuracy of the test results, and increases the automation level of the entire test process. Attached Figure Description

[0014] Figure 1 This is a diagram showing the state of this utility model in use.

[0015] Reference numerals in the attached diagram: 1-Equipment under test, 2-Water circuit shut-off valve, 3-Ammonia pressure transmitter, 4-Ammonia check valve, 5-Ammonia electric shut-off valve, 6-Ammonia shut-off valve, 7-Pressure pump, 8-Automatic gas switching device, 9-Nitrogen cylinder or ammonia cylinder, 11-Nitrogen shut-off valve, 12-Nitrogen electric shut-off valve, 13-Nitrogen check valve, 14-Nitrogen pressure transmitter, 15-Flow meter, 16-Water circuit check valve. Detailed Implementation

[0016] The present invention will be described below with reference to the accompanying drawings.

[0017] See Figure 1 This utility model discloses an automatic control device for ammonia leakage, including an ammonia pipeline, a nitrogen pipeline and a water pipeline. The ammonia pipeline includes an ammonia shut-off valve 6, an ammonia electric shut-off valve 5, an ammonia check valve 4 and an ammonia pressure transmitter 3 connected in sequence through the ammonia pipeline. One end of the ammonia pipeline is connected to an ammonia gas source, and the other end of the ammonia pipeline is connected to the device under test 1. The nitrogen pipeline includes a nitrogen shut-off valve 11, a nitrogen electric shut-off valve 12, a nitrogen check valve 13, and a nitrogen pressure transmitter 14 connected in sequence through the nitrogen pipeline. One end of the nitrogen pipeline is connected to a nitrogen source, and the other end of the nitrogen pipeline is connected to the device under test 1. The water pipeline includes a water tank, which is connected to the device under test 1 through a water circuit shut-off valve 2 and a water circuit check valve 16.

[0018] Ammonia or nitrogen gas source is connected to automatic gas switching device 8 via pressurization pump 7. Automatic gas switching device 8 is connected to ammonia branch and nitrogen branch via intermediate pipeline. The nitrogen branch and the end of the nitrogen branch furthest from the automatic gas switching device 8 are both connected to the air inlet of the device under test 1. The ammonia shut-off valve 6, the ammonia electric shut-off valve 5, the ammonia check valve 4, and the ammonia pressure transmitter 3 are all installed on the ammonia branch line. The nitrogen shut-off valve 11, nitrogen electric shut-off valve 12, nitrogen check valve 13, and nitrogen pressure transmitter 14 shown are all installed on the nitrogen branch.

[0019] Flow meters 15 are installed on both the ammonia branch and the nitrogen branch.

[0020] The equipment to be inspected 1 has two air inlets, namely the first air inlet and the second air inlet. The nitrogen branch and the ammonia branch are both seamless steel pipes. The nitrogen branch is connected to the first air inlet through a flange, and the ammonia branch is connected to the second air inlet through a flange.

[0021] It also includes a central pipeline, one end of which is connected to the first air inlet via a flange, and the other end is connected to the end of the nitrogen branch connected to the first air inlet. The end of the water pipe furthest from the water tank is connected to the main pipe.

[0022] In use, before the test, connect this utility model to the first air inlet and the second air inlet of the device under test 1. Except for the drain outlet, the first air inlet and the second air inlet, all other pipes in the device under test 1 are sealed with blind flanges. The drain outlet is connected to the drainage pool through the drain pipe.

[0023] Nitrogen gas is first introduced into the device under test 1 to replace the air inside the device 1, preventing an explosion caused by the mixture of gases produced after the introduction of ammonia gas. The nitrogen gas source can be a nitrogen cylinder, and the ammonia gas source can be an ammonia cylinder. The nitrogen cylinder or ammonia cylinder 9 is connected to the pressurization pump 7 and then to the automatic gas switching device 8. Two nitrogen cylinders or ammonia cylinders 9 are provided. The automatic gas switching device 8 can be a ZQ-2 type universal automatic switching manifold. A gas pressure is set in the automatic gas switching device 8 so that when the gas pressure in the pipeline falls below the set pressure, the device automatically switches to introduce the other gas cylinder. During use, nitrogen cylinders or ammonia cylinders 9 are installed as needed.

[0024] The pressure values ​​of nitrogen pressure transmitter 14 and ammonia pressure transmitter 3 are set according to the test pressure requirements.

[0025] Open the nitrogen shut-off valve 11 in the nitrogen pipeline, fill with nitrogen, and when bubbles appear in the drainage tank and the oxygen content at the outlet is detected to be less than 0.5%, close the drain outlet and close the nitrogen shut-off valve 11 in the nitrogen pipeline.

[0026] After completing the above work, remove the nitrogen cylinder, install the ammonia cylinder, and open the ammonia shut-off valve 6 of the ammonia pipeline. Pressurize the ammonia with the pressurizing pump 7 and fill the equipment 1 under test with ammonia. After the ammonia electric shut-off valve 5 in the ammonia pipeline is activated, close the ammonia shut-off valve 6 in the ammonia pipeline. Then replace the ammonia cylinder with a nitrogen cylinder and open the nitrogen shut-off valve 11 in the nitrogen pipeline. Pressurize the ammonia with the pressurizing pump 7 and fill the equipment 1 under test with nitrogen. After the nitrogen electric shut-off valve 12 in the nitrogen pipeline is activated, close the ammonia shut-off valve 6 in the ammonia pipeline and the automatic gas switching device 8.

[0027] After the ammonia leak test is passed, open the water circuit shut-off valve 2 and fill the equipment under test 1 with water. After a certain amount of water has been filled into the equipment under test 1, close the water circuit shut-off valve 2.

[0028] Before the gas is filled into the device under test 1, it is pressurized by a pressure pump 7 to solve the problem that the gas cannot be filled in due to the pressure difference between the internal pressure of the device under test 1 and the pipeline, thereby improving the utilization rate of the gas.

[0029] The pipeline is made of φ2.5x2.5mm stainless steel seamless pipe, material is S30408. The whole device is simple, lightweight and easy to move anytime and anywhere.

[0030] All pipeline components are connected using flanges, and the flanges are welded to the pipeline. The flange connection facilitates disassembly, while the welded connection ensures the quality of the flange-to-pipeline connection, guaranteeing the safety of the system during operation.

[0031] The pipeline is connected to the pipe opening of the equipment under inspection 1 by flange, which reduces the processing steps after the container passes the ammonia leakage test and improves the overall integrity of the manufacturing of the equipment under inspection 1.

[0032] This utility model provides a check valve to prevent gas backflow caused by pipeline leakage, which could damage related instruments in the entire pipeline system.

[0033] This invention sets a gas pressure in the automatic gas switching device 8 so that when the gas pressure in the pipeline is lower than the set pressure, the device automatically switches to fill another gas bottle, thus achieving uninterrupted gas filling and improving the efficiency of the experiment.

[0034] After passing the ammonia leak test, this invention fills the inside of the device under test with a certain amount of water so that some ammonia dissolves in the water to form ammonia water, thereby shortening the gas replacement time inside the container and reducing the amount of nitrogen used.

Claims

1. An automatic control device for ammonia leakage, comprising an ammonia pipeline, a nitrogen pipeline, and a water pipeline, characterized in that, The ammonia pipeline includes an ammonia shut-off valve, an ammonia electric shut-off valve, an ammonia check valve, and an ammonia pressure transmitter connected in sequence through the ammonia pipeline. One end of the ammonia pipeline is connected to an ammonia gas source, and the other end of the ammonia pipeline is connected to the equipment under test. The nitrogen pipeline includes a nitrogen shut-off valve, a nitrogen electric shut-off valve, a nitrogen check valve, and a nitrogen pressure transmitter connected in sequence through the nitrogen pipeline. One end of the nitrogen pipeline is connected to a nitrogen source, and the other end of the nitrogen pipeline is connected to the equipment under test. The water pipeline includes a water tank, which is connected to the equipment under test via a water circuit shut-off valve and a water circuit check valve.

2. The automatic control device for ammonia leakage as described in claim 1, characterized in that, The ammonia or nitrogen gas source is connected to an automatic gas switching device via a pressurizing pump. The automatic gas switching device is connected to the ammonia branch and the nitrogen branch via an intermediate pipeline. The nitrogen branch and the end of the nitrogen branch furthest from the automatic gas switching device are both connected to the air inlet of the equipment under test. The ammonia shut-off valve, ammonia electric shut-off valve, ammonia check valve, and ammonia pressure transmitter are all installed on the ammonia branch line. The nitrogen shut-off valve, nitrogen electric shut-off valve, nitrogen check valve, and nitrogen pressure transmitter shown are all installed on the nitrogen branch.

3. The automatic control device for ammonia leakage as described in claim 2, characterized in that, Flow meters are installed on both the ammonia branch and the nitrogen branch.

4. The automatic control device for ammonia leakage as described in claim 2, characterized in that, The equipment under inspection has two air inlets, namely a first air inlet and a second air inlet. Both the nitrogen branch and the ammonia branch are seamless steel pipes. The nitrogen branch is connected to the first air inlet through a flange, and the ammonia branch is connected to the second air inlet through a flange.

5. The automatic control device for ammonia leakage as described in claim 4, characterized in that, It also includes a central pipeline, one end of which is connected to the first air inlet via a flange, and the other end is connected to the end of the nitrogen branch connected to the first air inlet. The end of the water pipe furthest from the water tank is connected to the main pipe.

Images