Intelligent gas supply system of industrial gas island

Abstract

The utility model discloses an intelligent gas supply system of an industrial gas island, which comprises a gas supply main system, a first standby system and a second standby system which are connected in parallel by a DCS (Distributed Control System), the gas supply main system, the first standby system and the second standby system are connected to a gas supply main pipeline provided with a pressure detection piece and a flow detection piece through a first gas supply branch pipe, a second gas supply branch pipe and a third gas supply branch pipe which are provided with valves respectively, and the gas supply main pipeline is connected with a plurality of gas enterprises provided with gas pipelines. And the DCS is used for controlling the gas supply amount and the gas supply time of each gas consumption enterprise. The three gas supply points coordinate with one another, the DCS controls operation of each gas supply point, when a certain gas supply point breaks down, the gas supply points can be efficiently and automatically switched to supply gas to gas enterprises in time, the gas supply efficiency and the gas supply stability are improved, and the purposes of saving energy and reducing consumption are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of centralized gas supply of industrial gases, and in particular to an intelligent gas supply system for an industrial gas island. Background Art

[0002] Nitrogen is widely used in industry. In the chemical industry, nitrogen is the main raw material for synthesizing ammonia. In the electronics industry, dry nitrogen can be used to purge silicon wafers to keep them dry and clean. In the large-scale integrated circuit production process, high-purity nitrogen can be used as a carrier gas, inert protective gas and packaging gas for chemical reaction gases. In the silicone industry, nitrogen is used for protection, replacement, purging and other purposes. Its usage is large and its purity requirements are high. In view of the gas usage characteristics of the above industries, major enterprises generally build a set of air separation nitrogen production equipment to meet their own usage requirements. However, since there are multiple enterprises in a chemical industrial park, it will cause a large waste of resources if multiple enterprises prepare a set of air separation equipment each. This is because the air separation nitrogen production equipment of each enterprise is not connected to each other. Some air separation equipment has abundant gas in the venting state, while others need to increase the gas consumption, and the gas consumption cannot be guaranteed.

[0003] At present, some advanced industrial parks have adopted the form of industrial gas islands for gas supply. They use industrial gas as part of public works and adopt integrated centralized supply to achieve professionalism, safety, environmental protection and efficiency. However, the gas supply pipelines in the existing industrial gas supply system cannot achieve efficient automatic switching process, and the gas cost is high; and when the gas supply pipelines of the gas island fail, the gas supply will be interrupted, and the gas supply stability is poor. Utility Model Content

[0004] In order to solve the technical problems in the prior art that the gas supply pipeline cannot realize an efficient automatic switching process, the gas cost is high, when a fault occurs inside the gas supply pipeline of the gas island, the gas supply will be interrupted, and the gas supply stability is poor, the utility model provides the following technical solutions.

[0005] The utility model discloses an intelligent gas supply system for an industrial gas island, comprising a main gas supply system, a first backup system and a second backup system which are arranged in parallel and connected by a DCS control system. The main gas supply system, the first backup system and the second backup system are respectively connected to a gas supply main line provided with a pressure detection component and a flow detection component through a first gas supply branch pipe, a second gas supply branch pipe and a third gas supply branch pipe provided with valves. The gas supply main line is connected to a plurality of gas-using enterprises provided with gas pipelines, and the DCS control system controls the gas supply volume and gas supply time of each gas-using enterprise.

[0006] As a further technical solution, the main gas supply system includes a first nitrogen generator and a first spare part, and the first nitrogen generator and the first spare part are connected to a first dryer.

[0007] As a further technical solution, the first backup system includes a second nitrogen generator and a second backup component, and the second nitrogen generator and the second backup component are connected to a second dryer.

[0008] As a further technical solution, both the first spare part and the second spare part are liquid nitrogen tanks.

[0009] As a further technical solution, the main gas supply system is provided with a pressure gauge and a purity detector, and the first backup system is provided with a pressure gauge and a purity detector.

[0010] As a further technical solution, the second backup system includes an air separation device and a circulation component.

[0011] As a further technical solution, the circulation component is a buffer tank that can store and recover nitrogen.

[0012] As a further technical solution, the check valves at the outlets of the air compressors of the main air supply system, the first backup system and the second backup system are all axial flow check valves.

[0013] The beneficial effect of the utility model is that the three gas supply points of the main gas supply system, the first backup system and the second backup system of the utility model are coordinated with each other, adopting the idea of ​​unified configuration and multi-point backup, combined with the gas usage of the users, and controlled by the DCS control system to control the operation of each gas supply point. When a gas supply point fails, the gas supply point can be automatically switched efficiently to supply gas to the gas-using enterprise in time, thereby improving the gas supply efficiency and gas supply stability, and achieving the purpose of energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the intelligent gas supply system of the industrial gas island of the utility model;

[0015] In the figure: 1- main gas supply system; 101- first dryer; 102- first nitrogen generator; 103- first spare part; 104- first gas supply branch; 2- first backup system; 201- second dryer; 202- second nitrogen generator; 203- second spare part; 204- second gas supply branch; 3- second backup system; 301- air separation unit; 302- circulation part; 303- third gas supply branch; 4- main gas supply pipeline; 401- pressure detection part; 402- flow detection part; 5- gas-using enterprise; 501- gas pipeline. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0017] In the description of the present invention, it should be understood that the terms "upper" and "lower" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0018] like Figure 1 As shown, the utility model is an intelligent gas supply system for an industrial gas island, comprising a gas supply main system 1, a first backup system 2 and a second backup system 3 which are arranged in parallel and connected by a DCS control system. The gas supply main system 1, the first backup system 2 and the second backup system 3 are three independent gas supply points, which can supply gas to meet the gas demand at different stages. The gas supply main line 4 is provided with a pressure detection component 401 and a flow detection component 402, which are used to detect the nitrogen pressure and flow in the pipeline. The gas supply main system 1, the first backup system 2 and the second backup system 3 are respectively connected to the gas supply main line 4 through the first gas supply branch pipe 104, the second gas supply branch pipe 204 and the third gas supply branch pipe 303 which are provided with valves, that is, the gas supply main system 1, the first backup system 2 and the second backup system 3 are respectively connected to the gas supply main line 4 independently. The main gas supply line 4 is connected to a plurality of gas-consuming enterprises 5, each of which is equipped with an independent gas pipeline 501. The DCS control system controls the main gas supply system 1, the first backup system 2 and the second backup system 3 according to the gas supply volume and gas supply time, so as to provide each gas-consuming enterprise 5 with the required gas supply volume at the required gas supply time.

[0019] In a specific embodiment, the main gas supply system 1 includes a first nitrogen generator 102 and a first spare part 103, and the first nitrogen generator 102 and the first spare part 103 are connected to a first dryer 101. The first nitrogen generator 102 adopts a 18000 nitrogen generator with a nitrogen production capacity of 18000NM3 / h, and the first spare part 103 adopts a liquid nitrogen tank. When the 18000 nitrogen generator is insufficient in gas supply or the purity is not enough, the liquid nitrogen tank can be started to provide nitrogen to the gas supply main line 4.

[0020] The first backup system 2 includes a second nitrogen generator 202 and a second backup part 203, and the second nitrogen generator 202 and the second backup part 203 are connected to a second dryer 201. The second nitrogen generator 202 adopts a 4000 nitrogen generator with a nitrogen production capacity of 4000NM3 / h, and the second backup part 203 adopts a liquid nitrogen tank. When the 4000 nitrogen generator is insufficient in gas supply or the purity is not enough, the liquid nitrogen tank can be started to provide nitrogen to the gas supply main line 4.

[0021] In a specific embodiment, the main gas supply system 1 is provided with a pressure gauge and a purity detector, and the first backup system 2 is provided with a pressure gauge and a purity detector. The pressure gauge is used to detect the gas supply pressure, and the purity detector is used to detect the purity of nitrogen. The purity detector preferably adopts an infrared spectrometer and a mass spectrometer, which are connected to the gas supply pipeline. When insufficient pressure or insufficient purity is detected, the liquid nitrogen tank can be started to provide high-purity nitrogen to the main gas supply pipeline 4.

[0022] In a specific embodiment, the second backup system 3 includes an air separation device 301 and a circulation component 302. The air separation device 301 has a nitrogen production capacity of 6000NM3 / h. The circulation component 302 is a buffer tank that can store and recover nitrogen. The buffer tank is connected to a compressor. When the nitrogen in the gas supply main line 4 is insufficient, the nitrogen in the buffer tank can be released into the gas supply main line 4 for buffering; after the gas supply is sufficient, the surplus nitrogen in the second backup system 3 can be compressed and stored.

[0023] The check valve resistance at the outlet of the air compressor of the main gas supply system 1, the first backup system 2 and the second backup system 3 is as high as 15kpa. Since the valve in the original design is a butterfly check valve, the valve cannot be fully opened during normal operation, resulting in excessive pipeline resistance. Therefore, unlike the check valve of a conventional air compressor, the check valve of the utility model adopts an axial flow check valve, which can reduce the check valve resistance to 5kpa. After ASPEn simulation, it was found that when the gas volume is 33000NM3 / h, the resistance is reduced by 10kpa, and the exhaust pressure of the air compressor can be reduced by 10kpa, which can reduce electricity consumption and reduce the energy consumption of the entire system.

[0024] When the utility model is in use, the 18000 nitrogen generator of the gas supply main system 1 is started first to provide nitrogen to the gas supply main line 4. At this time, the total amount of nitrogen in the gas supply main line 4 is 18000NM3 / h. When soot blowing, the nitrogen consumption instantly increases to 22000NM3 / h; at this time, the pressure in the gas supply main line 4 drops sharply, and the liquid nitrogen tank of the gas supply main system 1 is started to supplement the nitrogen to the gas supply main line 4. At this time, the DCS control system can automatically release the nitrogen in the buffer tank in the second backup system to the gas supply main line 4 according to the fluctuation of nitrogen pressure and flow. Buffering is performed in pipeline 4. At this time, liquid nitrogen will not be consumed, which greatly reduces the cost. If the gas supply is still insufficient, the DCS control system automatically starts the air separation device 301 in the second backup system to supplement nitrogen into the gas supply main pipeline 4 according to the pressure in the buffer tank, the main pipeline flow rate, and the main pipeline pressure. The air separation device 301 automatically adjusts the load according to the pressure in the gas supply main pipeline 4. It automatically loads when the pressure is low and automatically reduces the load when the pressure is high. When the soot blowing is completed, the pressure in the buffer tank drops due to the gas supplement. At this time, the compressor is started to compress and store the surplus nitrogen.

[0025] When the abnormal situation causes the 18000 nitrogen generator to fail, the DCS control system immediately makes a judgment based on the feedback signal of the compressor operation of the 18000 nitrogen generator, immediately starts the air separation unit 301 to replenish gas in the gas supply main line 4, immediately opens the buffer tank valve to replenish gas in the gas supply main line 4, and immediately starts the liquid nitrogen tank to replenish gas in the gas supply main line 4 to maintain the system pressure stable. At the same time, the DCS control system prompts an alarm, and the operator immediately starts the 4000 nitrogen generator to replenish nitrogen in the gas supply main line 4. Since the main gas supply system 1, the first backup system 2, and the second backup system 3 are three independent gas supply points, and each gas supply point has a nitrogen generator and a liquid nitrogen tank or a buffer tank, any point failure can meet the gas supply requirements, thereby ensuring the gas supply safety of the park.

[0026] The preferred specific implementation modes and embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above implementation modes and embodiments, and various changes or equivalent substitutions can be made within the knowledge scope of those skilled in the art without departing from the concept of the utility model. Therefore, the utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the utility model.

Claims

1. An intelligent gas supply system for an industrial gas island, characterized in that: The invention comprises a gas supply main system (1), a first backup system (2) and a second backup system (3) which are arranged in parallel and connected by a DCS control system. The gas supply main system (1), the first backup system (2) and the second backup system (3) are respectively connected to a gas supply main line (4) provided with a pressure detection component (401) and a flow detection component (402) through a first gas supply branch pipe (104), a second gas supply branch pipe (204) and a third gas supply branch pipe (303) provided with valves. The gas supply main line (4) is connected to a plurality of gas-using enterprises (5) provided with gas pipelines (501). The DCS control system controls the gas supply volume and gas supply time of each gas-using enterprise (5).

2. The intelligent gas supply system for an industrial gas island according to claim 1, characterized in that: The main gas supply system (1) comprises a first nitrogen generator (102) and a first spare part (103), and the first nitrogen generator (102) and the first spare part (103) are connected to a first dryer (101).

3. The intelligent gas supply system for an industrial gas island according to claim 2, characterized in that: The first backup system (2) comprises a second nitrogen generator (202) and a second backup component (203), and the second nitrogen generator (202) and the second backup component (203) are connected to a second dryer (201).

4. The intelligent gas supply system for an industrial gas island according to claim 3 is characterized in that: The first spare part (103) and the second spare part (203) are both liquid nitrogen tanks.

5. The intelligent gas supply system for an industrial gas island according to claim 3, characterized in that: The main gas supply system (1) is provided with a pressure gauge and a purity detector, and the first backup system (2) is provided with a pressure gauge and a purity detector.

6. The intelligent gas supply system for an industrial gas island according to claim 1, characterized in that: The second backup system (3) comprises an air separation device (301) and a circulation component (302).

7. The intelligent gas supply system for an industrial gas island according to claim 6, characterized in that: The circulation component (302) is a buffer tank connected to an air compressor and capable of storing and recovering nitrogen.

8. The intelligent gas supply system for an industrial gas island according to claim 1, characterized in that: The check valves at the outlets of the air compressors of the main air supply system (1), the first backup system (2) and the second backup system (3) are all axial flow check valves.

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