Airtightness detection system for loading arm of hazardous chemical unloading station

Abstract

The utility model belongs to the technical field of unloading devices, and particularly relates to an air tightness detection system of a dangerous chemical unloading station loading arm. Comprising a tank car and a storage tank, a liquid phase discharging pipeline of the tank car is connected with a liquid phase feeding pipeline of the storage tank through a first flange, and an unloading feeding valve and a first pressure transmitter are arranged on the pipeline; a gas-phase discharging pipeline of the storage tank is connected with a gas-phase feeding pipeline of the tank car through a second flange, and a tank body gas-phase discharging valve and a second pressure transmitter are arranged on the pipeline; the nitrogen pipeline is respectively connected with a gas-phase discharging pipeline of the storage tank and a liquid-phase feeding pipeline of the storage tank through pipelines; and the gas-phase discharging pipeline of the storage tank and the liquid-phase feeding pipeline of the storage tank are respectively connected with the washing tower through pipelines. According to the dangerous chemical loading and unloading vehicle, the online instrument and the closed collecting pipeline are additionally arranged, air tightness monitoring in the unloading process is achieved, meanwhile, residual materials in the pipeline between the tank car and the unloading crane pipe can be effectively collected, and the safety and reliability of operation of the dangerous chemical loading and unloading vehicle are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of unloading devices, and in particular relates to an airtightness detection system for a crane pipe of a hazardous chemicals unloading station. Background Art

[0002] Hazardous chemicals, or dangerous chemicals, have dangerous characteristics such as spontaneous combustion, explosion, combustion-supporting, poisoning, and corrosion. Their safe transportation and storage have always been the focus of attention in the industrial field. During the handling and loading and unloading of hazardous chemicals, once they are subjected to friction, vibration, impact, or contact with fire sources, sunlight exposure, water moisture, or temperature and humidity changes, they are likely to cause catastrophic accidents such as combustion, explosion, and poisoning, causing casualties and property losses. Therefore, the safety and reliability of hazardous chemical loading and unloading operations are extremely important.

[0003] During the loading and unloading process of hazardous chemicals, the air tightness test of the connecting pipeline between the tank truck and the crane pipe of the unloading station is an important part of ensuring the safety of the loading and unloading process. Poor air tightness may lead to material leakage, which not only affects the loading and unloading efficiency, but may also cause safety accidents. Therefore, it is of great significance to establish a reliable air tightness detection system to monitor and control the air tightness of the connecting pipeline in real time to ensure the safety of the loading and unloading process of hazardous chemicals. Utility Model Content

[0004] In view of the above deficiencies in the prior art, the purpose of the utility model is to provide an air tightness detection system for the crane pipe of a hazardous chemical unloading station. By adding online instruments and closed collection pipelines, real-time monitoring and control of the air tightness of each connecting pipeline during the unloading process can be achieved to prevent leakage accidents. At the same time, through the closed collection system, the residual materials in the pipeline between the tank truck and the unloading crane pipe can be effectively collected and processed to ensure environmental safety and operational safety, greatly improving the safety and reliability of hazardous chemical loading and unloading operations.

[0005] The utility model is realized by adopting the following technical solutions:

[0006] The air tightness detection system of the crane pipe of the hazardous chemicals unloading station includes a tank truck and a storage tank. The liquid phase discharge pipeline of the tank truck is connected to the liquid phase feed pipeline of the storage tank through a No. 1 flange. The liquid phase feed pipeline of the storage tank is provided with an unloading feed valve and a No. 1 pressure transmitter. The on-off of the liquid phase feed pipeline of the storage tank is controlled by the unloading feed valve, and the pressure of the liquid phase feed pipeline of the storage tank is monitored by the No. 1 pressure transmitter; the gas phase discharge pipeline of the storage tank is connected to the gas phase feed pipeline of the tank truck through a No. 2 flange. The gas phase discharge pipeline of the storage tank is provided with a tank body gas phase discharge valve and a No. 2 pressure transmitter. The gas phase discharge pipeline of the storage tank is controlled by the tank body gas phase discharge valve. On and off, by monitoring the pressure of the gas phase discharge pipeline of the storage tank; the liquid phase discharge pipeline of the tank truck and the gas phase feed pipeline of the tank truck are respectively provided with a tank truck liquid phase discharge valve and a tank truck gas phase feed valve; it also includes a nitrogen pipeline, which is used to purge the pipeline by providing a nitrogen source, and the nitrogen pipeline is connected to the gas phase discharge pipeline of the storage tank and the liquid phase feed pipeline of the storage tank through pipelines, and a No. 1 nitrogen valve and a No. 2 nitrogen valve are respectively provided on the pipelines; the gas phase discharge pipeline of the storage tank and the liquid phase feed pipeline of the storage tank are also connected to the washing tower through pipelines, and a No. 1 discharge valve and a No. 2 discharge valve are respectively provided on the pipelines, and the discharged gas is recovered and processed through the washing tower.

[0007] The storage tank is provided with a liquid level sensor, which can monitor the liquid level in the storage tank in real time, provide accurate data to the operator, and ensure that the amount of material in the storage tank is within a safe range.

[0008] The tank truck and storage tank are both equipped with anti-static devices to prevent static sparks generated during the unloading process from causing explosions or fires of hazardous chemicals.

[0009] It also includes an alarm device. When the system detects an abnormality, such as excessive pressure, abnormal liquid level, etc., the alarm device will promptly sound an alarm to remind the operator.

[0010] Also includes a control system.

[0011] The control system is electrically connected to the unloading feed valve, No. 1 pressure transmitter, tank gas phase discharge valve, No. 2 pressure transmitter, No. 1 nitrogen valve, No. 2 nitrogen valve, No. 1 discharge valve, No. 2 discharge valve, liquid level sensor, anti-static device, alarm device, tank truck liquid phase discharge valve and tank truck gas phase feed valve.

[0012] The air tightness detection system of the crane pipe of the hazardous chemicals unloading station has the following working principle:

[0013] Confirm that the tank truck's liquid phase discharge valve, tank truck's gas phase feed valve, truck unloading feed valve, tank body gas phase discharge valve, No. 1 discharge valve and No. 2 discharge valve are closed; connect the tank truck's liquid phase discharge pipeline with the tank's liquid phase feed pipeline through No. 1 flange, connect the tank's gas phase discharge pipeline with the tank truck's gas phase feed pipeline through No. 2 flange, and connect the anti-static device; after the connection is completed, open No. 1 nitrogen valve, monitor the pipeline pressure through No. 2 pressure transmitter, and set high and low limits for No. 1 and No. 2 pressure transmitters, respectively. Control No. 1 nitrogen valve through the control system, press the pipeline to the high limit of No. 2 pressure transmitter, then close No. 1 nitrogen valve, and set a timer through the program. If the pipeline pressure does not drop to the low limit of No. 2 pressure transmitter within a certain period of time, the pipeline air tightness test is considered to be qualified. In the same steps, open the No. 2 nitrogen valve, control the pipeline pressure to the high limit of the No. 1 pressure transmitter through the control system, and monitor the pipeline pressure within a certain period of time. If the pipeline pressure does not drop to the low limit of the No. 1 pressure transmitter, the pipeline air tightness test is considered to be qualified. If the pressure of the No. 1 pressure transmitter or the No. 2 pressure transmitter is lower than the low limit during monitoring, and the interlocking alarm device sounds an alarm, open the No. 2 discharge valve or the No. 1 discharge valve to relieve the pressure of the pipeline. After venting to normal pressure, reconnect the flange and check the air tightness of each valve. After reconnecting, repeat the airtightness test steps until the air tightness of the gas and liquid phase pipelines are qualified before unloading operations can be carried out.

[0014] After the materials in the tank truck are unloaded, close the tank truck's liquid phase discharge valve, the tank truck's gas phase feed valve, the unloading vehicle feed valve and the tank body's gas phase discharge valve, open the No. 1 nitrogen valve and the No. 1 discharge valve, and purge the residual gas phase materials in the pipeline to the washing tower. After the purge is completed, close the No. 1 nitrogen valve and the No. 1 discharge valve, open the No. 2 nitrogen valve and the No. 2 discharge valve, and purge the residual liquid phase materials to the washing tower for recycling. After the purge is completed, close the No. 2 nitrogen valve and the No. 2 discharge valve, disconnect the No. 1 flange and the No. 2 flange, and the unloading is completed.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0016] (1) The air tightness detection system of the crane pipe of the hazardous chemicals unloading station described in the utility model effectively improves the safety of the loading and unloading process. Through the setting of the air tightness detection system, the air tightness of the connecting pipeline can be accurately judged to prevent safety accidents caused by leakage. At the same time, the setting of the anti-static device effectively avoids the risk of explosion or fire caused by static sparks;

[0017] (2) The air tightness detection system of the crane pipe of the hazardous chemicals unloading station described in the utility model improves the loading and unloading efficiency. Through automated control and intelligent monitoring, the operator can accurately grasp the operating status of the system, timely discover and handle abnormal situations, and realize automated management of the unloading process;

[0018] (3) The air tightness detection system for the crane pipe of the hazardous chemicals unloading station described in the utility model is beneficial to environmental protection. The exhaust gas is recycled and processed by the scrubbing tower, which reduces the pollution of harmful gases to the environment and meets environmental protection requirements;

[0019] (4) The air tightness detection system for the crane pipe of the hazardous chemicals unloading station described in the utility model is easy to operate and maintain. The control system is electrically connected to each device, so that the operator can remotely control the entire system through the control system, reducing the difficulty of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the air tightness detection system of the crane pipe of the hazardous chemicals unloading station described in the utility model;

[0021] In the figure: 1. Tank truck; 2. Storage tank; 3. No. 1 flange; 4. Unloading feed valve; 5. No. 1 pressure transmitter; 6. No. 2 flange; 7. Tank gas phase discharge valve; 8. No. 2 pressure transmitter; 9. Nitrogen pipeline; 10. No. 1 nitrogen valve; 11. No. 2 nitrogen valve; 12. Scrubber; 13. No. 1 discharge valve; 14. No. 2 discharge valve; 15. Liquid level sensor; 16. Anti-static device; 17. Alarm device; 18. Tank truck liquid phase discharge valve; 19. Tank truck gas phase feed valve. DETAILED DESCRIPTION

[0022] In order to make the purpose and technical solution of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] Example 1

[0024] like Figure 1 As shown, the air tightness detection system of the crane pipe of the hazardous chemicals unloading station comprises a tank truck 1 and a storage tank 2. The liquid phase discharge pipeline of the tank truck 1 is connected to the liquid phase feed pipeline of the storage tank 2 via a No. 1 flange 3. The liquid phase feed pipeline of the storage tank 2 is provided with an unloading feed valve 4 and a No. 1 pressure transmitter 5. The gas phase discharge pipeline of the storage tank 2 is connected to the gas phase feed pipeline of the tank truck 1 via a No. 2 flange 6. The gas phase discharge pipeline of the storage tank 2 is provided with a tank body gas phase discharge valve 7 and a No. 2 pressure transmitter 8. The liquid phase discharge pipeline of the tank truck 1 is connected to the liquid phase feed pipeline of the storage tank 2 via a No. 2 flange 6. The gas phase discharge pipeline of the storage tank 2 is provided with a tank body gas phase discharge valve 7 and a No. 2 pressure transmitter 8. The line and the gas phase feed pipeline of the tank truck 1 are respectively provided with a tank truck liquid phase discharge valve 18 and a tank truck gas phase feed valve 19; it also includes a nitrogen pipeline 9, which is connected to the gas phase discharge pipeline of the storage tank 2 and the liquid phase feed pipeline of the storage tank 2 through pipelines, and a No. 1 nitrogen valve 10 and a No. 2 nitrogen valve 11 are respectively provided on the pipelines; the gas phase discharge pipeline of the storage tank 2 and the liquid phase feed pipeline of the storage tank 2 are also connected to the washing tower 12 through pipelines, and a No. 1 discharge valve 13 and a No. 2 discharge valve 14 are respectively provided on the pipelines.

[0025] A liquid level sensor 15 is provided in the storage tank 2 .

[0026] The tank truck 1 and the storage tank 2 are both provided with an anti-static device 16 .

[0027] An alarm device 17 is also included.

[0028] Also includes a control system.

[0029] The control system is electrically connected to the unloading feed valve 4, the No. 1 pressure transmitter 5, the tank gas phase discharge valve 7, the No. 2 pressure transmitter 8, the No. 1 nitrogen valve 10, the No. 2 nitrogen valve 11, the No. 1 discharge valve 13, the No. 2 discharge valve 14, the liquid level sensor 15, the anti-static device 16, the alarm device 17, the tank truck liquid phase discharge valve 18 and the tank truck gas phase feed valve 19.

[0030] During the unloading process of hazardous chemicals, the airtightness detection system of the utility model is used, and its working process is as follows:

[0031] First, make sure that the tank truck liquid phase discharge valve 18, tank truck gas phase feed valve 19, unloading feed valve 4, tank body gas phase discharge valve 7, No. 1 discharge valve 13 and No. 2 discharge valve 14 are closed; connect the liquid phase discharge pipeline of tank truck 1 with the liquid phase feed pipeline of storage tank 2 through No. 1 flange 3, and connect the gas phase discharge pipeline of storage tank 2 with the gas phase feed pipeline of tank truck 1 through No. 2 flange 6. At the same time, connect the anti-static device 16.

[0032] Next, the control system opens the No. 1 nitrogen valve 10 and uses nitrogen to pressurize the gas phase pipeline. The No. 2 pressure transmitter 8 monitors the pipeline pressure in real time. When the pressure reaches the preset high limit, the No. 1 nitrogen valve 10 is closed. At this time, the control system starts the timer. If the pipeline pressure does not drop to the low limit within the set time, the pipeline is judged to be qualified for air tightness test.

[0033] Then, the same steps are used to test the air tightness of the liquid phase pipeline. If the pressure is detected to be lower than the lower limit, the alarm device 17 will sound an alarm. At this time, the corresponding No. 1 discharge valve 13 or No. 2 discharge valve 14 needs to be opened to release the pressure of the pipeline, and the air tightness of the connection and each valve needs to be rechecked. Repeat the test steps until both the gas and liquid phase pipelines are tested and qualified.

[0034] After the unloading operation is completed, close the tank truck liquid phase discharge valve 18, tank truck gas phase feed valve 19, unloading feed valve 4 and tank gas phase discharge valve 7, open the No. 1 nitrogen valve 10 or the No. 2 nitrogen valve 11, open the No. 1 discharge valve 13 or the No. 2 discharge valve 14 accordingly, and purge the residual materials in the pipeline through the nitrogen pipeline 9. During the purge process, the gas phase material and the liquid phase material are purged through the pipeline to the washing tower 12 for recycling. After the purge is completed, disconnect the No. 1 flange 3 and the No. 2 flange 6 to complete the entire unloading process.

Claims

1. An air tightness detection system for the crane pipe of a hazardous chemicals unloading station, characterized in that: The invention comprises a tank truck (1) and a storage tank (2), wherein the liquid phase discharge pipeline of the tank truck (1) is connected to the liquid phase feed pipeline of the storage tank (2) via a No. 1 flange (3), the liquid phase feed pipeline of the storage tank (2) is provided with a vehicle unloading feed valve (4) and a No. 1 pressure transmitter (5), the gas phase discharge pipeline of the storage tank (2) is connected to the gas phase feed pipeline of the tank truck (1) via a No. 2 flange (6), the gas phase discharge pipeline of the storage tank (2) is provided with a tank body gas phase discharge valve (7) and a No. 2 pressure transmitter (8), the liquid phase discharge pipeline of the tank truck (1) is connected to the gas phase discharge ... The feed pipeline is provided with a tank truck liquid phase discharge valve (18) and a tank truck gas phase feed valve (19), respectively; it also includes a nitrogen pipeline (9), the nitrogen pipeline (9) is connected to the gas phase discharge pipeline of the storage tank (2) and the liquid phase feed pipeline of the storage tank (2) through pipelines, and a No. 1 nitrogen valve (10) and a No. 2 nitrogen valve (11) are respectively provided on the pipelines; the gas phase discharge pipeline of the storage tank (2) and the liquid phase feed pipeline of the storage tank (2) are also connected to the washing tower (12) through pipelines, respectively, and a No. 1 discharge valve (13) and a No. 2 discharge valve (14) are respectively provided on the pipelines.

2. The air tightness detection system for the crane pipe of the hazardous chemicals unloading station according to claim 1 is characterized in that: A liquid level sensor (15) is provided in the storage tank (2).

3. The air tightness detection system for the crane pipe of the hazardous chemicals unloading station according to claim 2 is characterized in that: The tank truck (1) and storage tank (2) are both provided with an anti-static device (16).

4. The air tightness detection system for the crane pipe of the hazardous chemicals unloading station according to claim 3 is characterized in that: It also includes an alarm device (17).

5. The air tightness detection system for the crane pipe of the hazardous chemicals unloading station according to claim 4 is characterized in that: Also includes a control system.

6. The air tightness detection system for the crane pipe of the hazardous chemicals unloading station according to claim 5 is characterized in that: The control system is electrically connected to the unloading feed valve (4), the No. 1 pressure transmitter (5), the tank gas phase discharge valve (7), the No. 2 pressure transmitter (8), the No. 1 nitrogen valve (10), the No. 2 nitrogen valve (11), the No. 1 discharge valve (13), the No. 2 discharge valve (14), the liquid level sensor (15), the anti-static device (16), the alarm device (17), the tank truck liquid phase discharge valve (18) and the tank truck gas phase feed valve (19).

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