Ultrahigh pressure nitrogen supply system

Abstract

The utility model belongs to the technical field of ultrahigh-pressure gas manufacturing, and particularly relates to an ultrahigh-pressure nitrogen supply system. The system comprises a liquid nitrogen truck, a gasification device, a first-stage supercharging device and a second-stage supercharging device, a liquid nitrogen storage tank is arranged on the liquid nitrogen vehicle, the liquid nitrogen storage tank is communicated with a liquid inlet of the gasification device through a pipeline, a gas outlet of the gasification device is communicated with a gas inlet of the first-stage supercharging device through a pipeline, and a gas outlet of the first-stage supercharging device is communicated with a gas inlet of the second-stage supercharging device through a pipeline. A liquid nitrogen storage tank of a liquid nitrogen truck is adopted as a gas source, liquid nitrogen is gasified by arranging a gasification device, nitrogen is pressurized into ultrahigh-pressure gas by arranging a two-stage supercharging device to meet the use requirement, the gas source capacity is increased, continuous and stable output and supply of the ultrahigh-pressure nitrogen are guaranteed, and manpower is saved; and the residual liquid nitrogen can be transported to the next use place for continuous use, so that nitrogen energy and production cost are saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultra-high pressure gas manufacturing, and in particular relates to an ultra-high pressure nitrogen supply system. Background Art

[0002] Ultra-high pressure equipment such as polyethylene ultra-high pressure reactors and ultra-high pressure isostatic presses are often used in the petrochemical industry. These ultra-high pressure equipment are of many types, large in quantity, and have complex manufacturing and installation processes. They need to be subjected to pressure tests and airtightness tests before use, and a large amount of continuous ultra-high pressure gas is often required during the experiment. It is generally believed that pressure exceeding 100Mpa is ultra-high pressure. Experimental gases can be selected from nitrogen, helium, carbon dioxide or hydrogen. Nitrogen has good stability and is cheap and easy to obtain. Therefore, nitrogen is generally used for experiments.

[0003] like Figure 1 As shown, the current ultra-high pressure nitrogen supply system includes a high-pressure nitrogen tank 91 and a booster 92 which are interconnected. The maximum pressure of the nitrogen output by the high-pressure nitrogen tank 91 is 40Mpa. The nitrogen output by the high-pressure nitrogen tank 91 is boosted to above 100Mpa by the booster 92 to obtain ultra-high pressure nitrogen, and the ultra-high pressure nitrogen is passed into the equipment for experiments. The capacity of the commonly used high-pressure nitrogen tank 91 is divided into two specifications of 10L and 40L, with a maximum capacity of 50L. The existing ultra-high pressure nitrogen supply system mainly has the following disadvantages:

[0004] 1. The commonly used high-pressure nitrogen tank 91 has a small volume. When the ultra-high-pressure nitrogen ventilation volume required for the experiment is large or the ventilation time is long, a large number of high-pressure nitrogen tanks 91 are needed to supply nitrogen. During the gas supply process, the high-pressure nitrogen tanks 91 need to be replaced manually, and high-pressure nitrogen cannot be continuously provided to the booster device 92, resulting in low gas supply efficiency and increased workload for operators.

[0005] 2. When the gas pressure output by the high-pressure nitrogen tank 91 is the same as the pressure in the storage tank, the remaining nitrogen in the high-pressure nitrogen tank 91 cannot be further output, and a large amount of nitrogen retained in the tank body cannot be further used, resulting in waste. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide an ultra-high pressure nitrogen supply system to ensure the continuous and stable output of ultra-high pressure nitrogen, improve the utilization rate of nitrogen and save manpower.

[0007] The technical solution adopted by the utility model to solve the technical problem is: an ultra-high pressure nitrogen supply system, comprising a liquid nitrogen truck, a gasification device, a primary boosting device and a secondary boosting device; the liquid nitrogen truck is provided with a liquid nitrogen storage tank, the liquid nitrogen storage tank is connected to the liquid inlet of the gasification device through a pipeline, the gas outlet of the gasification device is connected to the gas inlet of the primary boosting device through a pipeline, and the gas outlet of the primary boosting device is connected to the gas inlet of the secondary boosting device through a pipeline.

[0008] Furthermore, a first opening and closing valve is provided at the liquid inlet of the gasification device, and a second opening and closing valve is provided at the gas outlet of the secondary boosting device.

[0009] Furthermore, the gasification device is provided in plurality, and the plurality of gasification devices are connected in series to form a gasification system;

[0010] The air inlet of the gasification system is communicated with the liquid nitrogen storage tank, and the air outlet of the gasification system is communicated with the air inlet of the first-stage boosting device.

[0011] Furthermore, a pressure gauge and an air intake valve are provided at the air intake of the first-stage supercharging device and the air intake of the second-stage supercharging device.

[0012] Furthermore, a first buffer device is provided between the gasification device and the first-stage supercharging device, the gas outlet of the gasification device is connected to the gas inlet of the first buffer device, and the gas outlet of the first buffer device is connected to the gas inlet of the first-stage supercharging device;

[0013] A second buffer device is provided between the primary supercharging device and the secondary supercharging device, the air outlet of the primary supercharging device is communicated with the air inlet of the second buffer device, and the air outlet of the second buffer device is communicated with the air inlet of the secondary supercharging device.

[0014] Compared with the prior art, the beneficial effects of the utility model are: providing an ultra-high pressure nitrogen supply system, the utility model adopts the liquid nitrogen storage tank of the liquid nitrogen truck as the gas source, gasifies the liquid nitrogen by setting a gasification device, and pressurizes the nitrogen into ultra-high pressure gas by setting a two-stage boosting device to meet the use requirements, increases the gas source capacity, and does not need to switch the gas source during the gas supply process, ensuring the continuous and stable output supply of ultra-high pressure nitrogen, reducing the labor intensity of the operators, and saving manpower; the remaining liquid nitrogen in the liquid nitrogen storage tank can be transported to the next use location for continued use, saving nitrogen energy and production costs. By setting an opening and closing valve at the liquid inlet of the gasification device and the gas outlet of the two-stage boosting device, the remaining nitrogen in the gas supply system is stored for next use, which is safe, environmentally friendly, and cost-saving. By setting a plurality of gasification devices connected in series to extend the storage time of nitrogen in the gasification device, it is beneficial to increase the temperature of nitrogen and cause it to expand due to heat, further improving the utilization efficiency of nitrogen. By setting a pressure gauge and an intake valve at the air inlet of the booster device, the operator can adjust the intake valve according to the reading of the pressure gauge, thereby controlling the opening and closing of the air inlet of the booster device, improving the working efficiency of the booster device, and ensuring the pressure value of the final output nitrogen. By setting a buffer device, it is ensured that medium-pressure nitrogen is continuously and stably input to the first-stage booster device and high-pressure nitrogen is input to the second-stage booster device, thereby ensuring that the entire ultra-high pressure nitrogen supply system continuously outputs ultra-high pressure gas that meets the pressure requirements, which is stable and reliable, and ensures the experimental efficiency of the ultra-high pressure equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an existing ultra-high pressure nitrogen supply system in the background technology;

[0016] Figure 2 It is a structural schematic diagram of the utility model;

[0017] Figure numerals: 1-liquid nitrogen truck; 11-liquid nitrogen storage tank; 2-gasification device; 21-first opening and closing valve; 3-first stage boosting device; 4-second stage boosting device; 41-second opening and closing valve; 5-first buffer device; 6-second buffer device; 7-pressure gauge; 8-intake valve; 91-high-pressure nitrogen tank; 92-boosting device. DETAILED DESCRIPTION

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] As attached Figure 2As shown, an ultra-high pressure nitrogen supply system comprises a liquid nitrogen truck 1, a gasification device 2, a primary boosting device 3 and a secondary boosting device 4; the liquid nitrogen truck 1 is provided with a liquid nitrogen storage tank 11, the liquid nitrogen storage tank 11 is connected to the liquid inlet of the gasification device 2 through a pipeline, the gas outlet of the gasification device 2 is connected to the gas inlet of the primary boosting device 3 through a pipeline, and the gas outlet of the primary boosting device 3 is connected to the gas inlet of the secondary boosting device 4 through a pipeline.

[0020] The liquid nitrogen truck 1 is generally provided with devices such as a high-pressure liquid nitrogen pump and a liquid nitrogen evaporator. When in use, the gas outlet of the secondary boosting device 4 is manually connected to the gas inlet of the ultra-high pressure equipment, and the liquid nitrogen storage tank 11 is connected to the liquid inlet of the gasification device 2. The high-pressure liquid nitrogen pump draws the liquid nitrogen in the liquid nitrogen storage tank 11 into the gasification device 2. The liquid nitrogen absorbs heat and gasifies into medium-pressure nitrogen in the gasification device 2. The nitrogen in the gasification device 2 is output to the primary boosting device 3 and is initially pressurized to obtain high-pressure nitrogen with a pressure value in the range of 20 to 40 MPa. The high-pressure nitrogen is output from the primary boosting device 3 to the secondary boosting device 4 and is subjected to secondary pressurization to obtain ultra-high pressure gas with a pressure value of more than 100 MPa. The ultra-high pressure gas is transported to the ultra-high pressure equipment via the gas outlet of the secondary boosting device 4. Common boosters cannot directly pressurize medium-pressure gas to ultra-high pressure, so the primary boosting device 3 and the secondary boosting device 4 need to be used in conjunction to pressurize the nitrogen to the required pressure value.

[0021] Medium-pressure gas generally refers to gas with a pressure value between 0.1 and 10 MPa. After the ultra-high pressure equipment test is completed, the liquid nitrogen storage tank 11 is disconnected from the gasification device 2, and the liquid nitrogen truck 1 transports the remaining liquid nitrogen in the liquid nitrogen storage tank 11 to the next use site for continued use, thereby improving the utilization rate of liquid nitrogen and saving nitrogen energy and production costs. The common liquid nitrogen truck 1 generally has a capacity of 5 to 30 m 3 The volume of liquid nitrogen will also increase after being vaporized, so the amount of nitrogen it supplies is much larger than the amount of nitrogen provided by a single high-pressure nitrogen tank 91. There is no need to frequently switch the gas source manually, nor is there any need to frequently connect and disconnect the liquid nitrogen storage tank 11 and the vaporization device 2 manually, which reduces the labor intensity of the operators, ensures the continuous supply of liquid nitrogen during the ultra-high pressure equipment test, ensures the stable output and supply of ultra-high pressure gas, improves the supply efficiency of ultra-high pressure nitrogen, and saves manpower.

[0022] Preferably, a first opening and closing valve 21 is provided at the liquid inlet of the gasification device 2, and a second opening and closing valve 41 is provided at the gas outlet of the secondary boosting device 4. After the ultra-high pressure equipment inspection is completed, the first opening and closing valve 21 and the second opening and closing valve 41 are closed first, and then the liquid nitrogen storage tank 11 and the gasification device 2 are disconnected, and the remaining nitrogen in the gas supply system is stored for next use, so as to avoid the remaining nitrogen from being discharged into the air, which is safe, environmentally friendly and cost-saving.

[0023] The gasification device 2 is used to contain the liquid nitrogen output by the liquid nitrogen storage tank 11, and to provide a storage space for the liquid nitrogen to be gasified into nitrogen. The gasification device 2 can be a container such as a kettle body or a tank body with a liquid inlet and a gas outlet. In order to improve the gasification efficiency of liquid nitrogen, a heating device can be provided on the gasification device 2. The gasification device 2 can be provided with one or more. Preferably, the gasification device 2 is provided with multiple gasification devices 2, and the multiple gasification devices 2 are connected in series to form a gasification system; the gas inlet of the gasification system is connected to the liquid nitrogen storage tank 11, and the gas outlet of the gasification system is connected to the gas inlet of the first-stage boosting device 3. By providing multiple gasification devices 2 connected in series to extend the storage time of nitrogen in the gasification device 2, it is beneficial to increase the temperature of nitrogen and make it expand due to heat, thereby further improving the utilization efficiency of nitrogen. Generally speaking, two gasification devices 2 connected in series can meet the demand of heating nitrogen to room temperature. At this time, the nitrogen pressure output by the gasification device 2 at the output end is about 2Mpa.

[0024] The first-stage boosting device 3 is used to boost the medium-pressure nitrogen to high-pressure nitrogen, and can use common compressors such as the V-0.6 / 420 nitrogen compressor or the V-0.5 / 250 nitrogen compressor produced by Zigong Norlis Baisheng Compressor Co., Ltd.; the second-stage boosting device 4 is used to boost the high-pressure gas output by the first-stage boosting device 3 to ultra-high-pressure nitrogen and then output it. The second-stage boosting device 4 can use the 21JC-59-01-00 ultra-high-pressure compressor of Magsweit (Shanghai) Fluid Engineering Co., Ltd. Preferably, a pressure gauge 7 and an intake valve 8 are provided at the air inlet of the first-stage boosting device 3 and the air inlet of the second-stage boosting device 4 to display the gas pressure at the air inlet of the two boosting devices. The pressure gauge 7 at the air inlet of the first-stage boosting device 3 detects the nitrogen pressure value output by the gasification device 2, and the pressure gauge 7 at the air inlet of the second-stage boosting device 4 detects the nitrogen pressure value output by the first-stage boosting device 3. When the operator finds that the reading of the pressure gauge 7 is less than the preset value, the air intake valve 8 can be closed to increase the nitrogen pressure at the air inlet of the supercharging device. When the reading of the pressure gauge 7 reaches the preset value, the air intake valve 8 can be opened to improve the working efficiency of the supercharging device and ensure the final output nitrogen pressure value. Based on the reading on the pressure gauge 7, the staff can estimate the final output gas pressure value and gas supply efficiency of the system, and then adjust the efficiency of the liquid nitrogen supply by the liquid nitrogen truck 1.

[0025] Preferably, a first buffer device 5 is provided between the gasification device 2 and the first-stage booster device 3, the gas outlet of the gasification device 2 is connected to the gas inlet of the first buffer device 5, and the gas outlet of the first buffer device 5 is connected to the gas inlet of the first-stage booster device 3; a second buffer device 6 is provided between the first-stage booster device 3 and the second-stage booster device 4, the gas outlet of the first-stage booster device 3 is connected to the gas inlet of the second buffer device 6, and the gas outlet of the second buffer device 6 is connected to the gas inlet of the second-stage booster device 4. The nitrogen in the gasification device 2 is stored and buffered by the first buffer device 5 and then input into the first-stage booster device 3, and the high-pressure nitrogen output by the first-stage booster device 3 is stored and buffered by the second buffer device 6 and then input into the second-stage booster device 4. The first buffer device 5 is used to ensure the continuous and stable input of medium-pressure nitrogen to the first-stage booster device 3, and the second buffer device 6 is used to ensure the continuous and stable input of high-pressure nitrogen to the second-stage booster device 4, thereby ensuring that the entire ultra-high-pressure nitrogen supply system continuously outputs ultra-high-pressure gas that meets the pressure requirements, is stable and reliable, and ensures the experimental efficiency of the ultra-high-pressure equipment.

Claims

1. An ultra-high pressure nitrogen supply system, characterized in that: The invention comprises a liquid nitrogen vehicle (1), a gasification device (2), a primary pressure boosting device (3) and a secondary pressure boosting device (4); the liquid nitrogen vehicle (1) is provided with a liquid nitrogen storage tank (11); the liquid nitrogen storage tank (11) is connected to a liquid inlet of the gasification device (2) through a pipeline; the gas outlet of the gasification device (2) is connected to an gas inlet of the primary pressure boosting device (3) through a pipeline; the gas outlet of the primary pressure boosting device (3) is connected to an gas inlet of the secondary pressure boosting device (4) through a pipeline.

2. The ultra-high pressure nitrogen supply system according to claim 1, characterized in that: A first opening and closing valve (21) is provided at the liquid inlet of the gasification device (2), and a second opening and closing valve (41) is provided at the gas outlet of the secondary pressure boosting device (4).

3. The ultra-high pressure nitrogen supply system according to claim 1, characterized in that: The gasification device (2) is provided in plurality, and the plurality of gasification devices (2) are connected in series to form a gasification system; The air inlet of the gasification system is connected to the liquid nitrogen storage tank (11), and the air outlet of the gasification system is connected to the air inlet of the first-stage boosting device (3).

4. The ultra-high pressure nitrogen supply system according to claim 1, characterized in that: A pressure gauge (7) and an air intake valve (8) are provided at the air intake of the first-stage supercharging device (3) and the air intake of the second-stage supercharging device (4).

5. The ultra-high pressure nitrogen supply system according to any one of claims 1 to 4, characterized in that: A first buffer device (5) is provided between the gasification device (2) and the first-stage supercharging device (3); the gas outlet of the gasification device (2) is connected to the gas inlet of the first buffer device (5); and the gas outlet of the first buffer device (5) is connected to the gas inlet of the first-stage supercharging device (3); A second buffer device (6) is provided between the first-stage boosting device (3) and the second-stage boosting device (4); the air outlet of the first-stage boosting device (3) is communicated with the air inlet of the second buffer device (6); and the air outlet of the second buffer device (6) is communicated with the air inlet of the second-stage boosting device (4).

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