Long-distance raw material nitrogen conveying device

Abstract

The utility model provides a long-distance raw material nitrogen conveying device. The long-distance raw material nitrogen conveying device comprises a gas supply pipeline, a first cooling water tank and a second cooling water tank, the tail section of the gas supply pipeline sequentially penetrates through a first cooling water tank and a second cooling water tank and then is connected with a nitrogen compressor, the cooling water tanks are connected with a water supply system through water inlet pipes and connected with a water treatment system pool through water return pipes, overflow valves are arranged at the top ends of the cooling water tanks, and drain valves are arranged at the lower ends of the cooling water tanks. The second cooling water tank is connected with a freezing water source through a freezing water inlet pipe and provided with a freezing water valve, and the air supply pipeline is provided with third thermometers before penetrating through the first cooling water tank, after penetrating through the first cooling water tank and after penetrating through the second cooling water tank. After being cooled, nitrogen is fed into the nitrogen compressor, so that the stable and efficient operation of the nitrogen compressor can be effectively ensured; produced rich nitrogen is matched with a nitrogen compressor to be fed into a nitrogen pipe network, and a large amount of economic benefits can be created every year.

Description

Technical Field

[0001] The utility model belongs to the technical field of nitrogen transportation, and in particular relates to a long-distance raw material nitrogen transportation device. Background Art

[0002] Oxygen and nitrogen products produced by oxygen generators in steel enterprises are mainly supplied to users such as converter steelmaking and blast furnace ironmaking. Sometimes when the oxygen consumption of steel enterprises drops sharply, the oxygen generator needs to be shut down, otherwise the amount of oxygen venting is too large. However, when the user's oxygen demand decreases, and nitrogen is used as protective gas for cold rolling and continuous casting, blast furnace top, converter smoke hood sealing gas and instrument gas for many equipment, its demand does not decrease synchronously with the oxygen consumption, and shutdown will cause supply shortages. Therefore, the surplus nitrogen produced by the running unit is usually connected to the nitrogen compressor of the shut-down unit for compression, and the low-pressure nitrogen is pressurized and sent to the nitrogen pipeline network for users. However, one problem faced by this solution is that due to the long distance between different units, in the high temperature of summer, the pipeline is exposed to the sun, resulting in the temperature of the transported raw nitrogen being too high (reaching above 60°C), causing the nitrogen compressor to fail to work properly. According to the ideal gas state equation PV=RT, when the pressure (P) does not change much, the gas volume is proportional to the temperature. As the temperature increases, the gas expands more, the gas density decreases, and the compressor can inhale less gas. For example, according to the formula P1V1 / T1=P2V2 / T2, when P1 and P2 do not change much, and the gas temperature T1 increases from 293K to T2333K, the gas supply volume V120000 cubic meters will expand to 22730 cubic meters, and the density of the same mass of gas is only 88% of the original. A significant reduction in the amount of gas will cause the compressor to fail to work properly. Due to the reduction in the amount of inhaled gas, the centrifugal compressor will experience surge, the gas cannot be supplied normally, and the compressor will be damaged. Even if it is barely supplied, the energy consumption will be very high. During the gas supply process, it is necessary to ensure that the pipeline temperature does not rise significantly. Since the outlet pressure of the raw nitrogen of the air separation tower is about 15kPa and the gas supply pipeline is too long (more than 1000 meters), additional resistance cannot be added to the pipeline when designing the insulation device. In addition, since the pipeline is too long and the environment around the pipeline is complex, it is extremely difficult to wrap the pipeline with a large amount of insulation material, and the construction cost is too high. Summary of the invention

[0003] Purpose of the invention: In view of the shortcomings of the prior art, the purpose of the utility model is to provide a long-distance raw nitrogen conveying device to cool the gas supply pipeline, better solve the problem of high temperature in the gas supply pipeline, and enable the nitrogen compressor to work normally.

[0004] Technical solution: The utility model provides a long-distance raw nitrogen delivery device, including an air supply pipeline, a first cooling water tank, and a second cooling water tank; the end section of the air supply pipeline passes through the first cooling water tank and the second cooling water tank in sequence and is connected to the nitrogen compressor, the first cooling water tank and the second cooling water tank are connected to the water supply system through a water inlet pipe, and are connected to the water treatment system pool through a return pipe, the first cooling water tank is provided with a first overflow valve at the top and a first drain valve at the bottom, the second cooling water tank is provided with a second overflow valve at the top and a second drain valve at the bottom, and is connected to the first cooling water tank A first water inlet valve is provided on the water inlet pipe, a first water return valve is provided on the water return pipe connected to the first cooling water tank, a second water inlet valve is provided on the water inlet pipe connected to the second cooling water tank, a second water return valve is provided on the water return pipe connected to the second cooling water tank, the second cooling water tank is connected to a chilled water source via a chilled water inlet pipe, a chilled water valve is provided on the chilled water inlet pipe, a first thermometer is provided on the air supply pipeline before passing through the first cooling water tank, a second thermometer is provided on the air supply pipeline after passing through the first cooling water tank and before passing through the second cooling water tank, and a third thermometer is provided on the air supply pipeline after passing through the second cooling water tank.

[0005] Furthermore, the long-distance raw nitrogen gas delivery device also includes a central control system, and the first thermometer, the second thermometer, and the third thermometer are electrically connected to the central control system to feed back the measured temperature to the central control system in real time.

[0006] Furthermore, the chilled water valve is an electric regulating valve, which is electrically connected to a central control system. The central control system controls the opening and closing and the opening degree of the chilled water valve according to the real-time temperature feedback from the second thermometer and the third thermometer.

[0007] Furthermore, the first water inlet valve and the second water inlet valve are both electric regulating valves, which are electrically connected to the central control system. The central control system controls the opening of the first water inlet valve and the second water inlet valve according to the real-time temperature feedback from the first thermometer, the second thermometer, and the third thermometer.

[0008] Furthermore, the central control system sets the temperature control of the third thermometer to 25° C. When the real-time temperature of the third thermometer is higher than 25° C., the central control system opens the chilled water valve.

[0009] Furthermore, the central control system sets a third thermometer alarm temperature control. When the real-time temperature of the third thermometer is higher than the alarm temperature control, the central control system issues an alarm reminder.

[0010] Furthermore, the alarm temperature is controlled at 28°C.

[0011] Beneficial effects: Compared with the prior art, the utility model has the following advantages: (1) The utility model has a simple structure and is easy to operate. The nitrogen is cooled and sent to the nitrogen compressor through the long-distance raw nitrogen conveying device, which can effectively ensure the stable and efficient operation of the nitrogen compressor; (2) The central control system program control can be increased, manual operation can be reduced, precise control and refined management can be achieved; (3) The produced rich nitrogen is sent to the nitrogen pipeline network through the long-distance raw nitrogen conveying device and the nitrogen compressor, which can create a large amount of economic benefits every year. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic structural diagram of a long-distance raw material nitrogen delivery device provided by the utility model. DETAILED DESCRIPTION

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Example 1

[0015] like Figure 1 As shown, the long-distance raw nitrogen delivery device provided by the utility model comprises an air supply pipeline, a first cooling water tank, and a second cooling water tank; the end section of the air supply pipeline passes through the first cooling water tank and the second cooling water tank in sequence and is connected to the nitrogen compressor; the first cooling water tank and the second cooling water tank are connected to the water supply system through a water inlet pipe, and are connected to the water treatment system pool through a return pipe; the first cooling water tank is provided with a first overflow valve 7 at the top and a first drain valve 5 at the bottom; the second cooling water tank is provided with a second overflow valve 8 at the top and a second drain valve 6 at the bottom; the water inlet pipe connected to the first cooling water tank is provided with a There is a first water inlet valve 1, a first water return valve 2 is provided on the return pipe connected to the first cooling water tank, a second water inlet valve 3 is provided on the return pipe connected to the second cooling water tank, a second water return valve 4 is provided on the return pipe connected to the second cooling water tank, the second cooling water tank is connected to the chilled water source through a chilled water inlet pipe, a chilled water valve 9 is provided on the chilled water inlet pipe, a first thermometer 10 is provided on the air supply pipeline before passing through the first cooling water tank, a second thermometer 11 is provided on the air supply pipeline before passing through the second cooling water tank after passing through the first cooling water tank, and a third thermometer 12 is provided on the air supply pipeline after passing through the second cooling water tank. The long-distance raw nitrogen gas delivery device also includes a central control system 13, the first thermometer 10, the second thermometer 11, and the third thermometer 12 are electrically connected to the central control system 13, and the measured temperature is fed back to the central control system in real time. The chilled water valve 9 is set as an electric regulating valve, which is electrically connected to the central control system 13. The central control system 13 controls the opening and closing and opening degree of the chilled water valve 9 according to the real-time temperature feedback from the second thermometer 11 and the third thermometer 12.

[0016] In the hot summer season, the gas supply pipeline is exposed to the sun, causing the gas temperature to rise significantly, reaching over 60°C. In order to reduce the gas supply temperature, the utility model is used as follows:

[0017] 1. Normal use:

[0018] 1. Open the first water inlet valve 1 and the second water inlet valve 3, and fill the two cooling water tanks with water (water temperature is about 20-25℃);

[0019] 2. Open the first overflow valve 7 and the second overflow valve 8, detect water outflow, confirm that the water in the two coolers has been filled, and close the first overflow valve 7 and the second overflow valve 8;

[0020] 3. Open the first water return valve 2 and the second water return valve 4 to return the water to the water treatment system pool for cooling;

[0021] 4. Observe that the gas supply temperature drops from about 60°C indicated by the first thermometer 10 at the inlet to about 20-25°C indicated by the third thermometer 12. The gas temperature meets the startup requirements and the nitrogen compressor is ready to start.

[0022] 2. When the ambient temperature is too high and the cooling effect is poor:

[0023] The central control system 13 sets the third thermometer 12 to set the temperature control to 25°C, and adjusts the chilled water valve 9 through the central control system. When the temperature is higher than 25°C, the chilled water valve 9 is opened to introduce chilled water of about 10°C from the refrigerator to cool the gas.

[0024] After the high temperature in summer has passed, close the first water inlet valve 1, the second water inlet valve 3, the first water return valve 2, the second water return valve 4, open the first drain valve 5, the second drain valve 6, and drain all the water from the two cooling water tanks to prevent the cooling water tanks from being corroded and damaged due to moisture.

[0025] Example 2

[0026] The long-distance raw nitrogen gas delivery device is the same as in Example 1, except that the first water inlet valve 1 and the second water inlet valve 3 are both electric regulating valves, which are electrically connected to the central control system 13. The central control system 13 controls the opening of the first water inlet valve 1 and the second water inlet valve 3 according to the real-time temperature feedback from the first thermometer 10, the second thermometer 11, and the third thermometer 12. The central control system 13 sets the temperature control of the third thermometer 12 to 25°C. When the real-time temperature of the third thermometer 12 is higher than 25°C, the central control system 13 opens the chilled water valve 9.

[0027] Example 3

[0028] The long-distance raw nitrogen gas conveying device is the same as Example 1, except that the central control system 13 is provided with a third thermometer 12 for alarm temperature control. When the real-time temperature of the third thermometer 12 is higher than the alarm temperature control, the central control system 13 issues an alarm reminder to remind the operator to go to the site for inspection and processing. The alarm temperature control is set to 28°C.

[0029] The utility model has a simple structure and is easy to operate. Through a long-distance raw nitrogen delivery device, the nitrogen is cooled and then sent to a nitrogen compressor, which can effectively ensure the stable and efficient operation of the nitrogen compressor; the central control system program control is increased to reduce manual operation, accurate control, and refined management; the utility model is used to deliver the produced surplus nitrogen in conjunction with the nitrogen compressor into the nitrogen pipeline network, which can deliver 20,000 cubic meters of nitrogen per hour, and according to the unit accounting, the profit is settled at 0.1 yuan per cubic meter of nitrogen. Calculated based on 120 days of high temperature each year, it can generate economic benefits of about 5.76 million yuan each year, which has a good economic effect.

Claims

1. A long-distance raw material nitrogen delivery device, characterized in that: The invention comprises an air supply pipeline, a first cooling water tank and a second cooling water tank; the end section of the air supply pipeline passes through the first cooling water tank and the second cooling water tank in sequence and is connected to the nitrogen compressor; the first cooling water tank and the second cooling water tank are connected to the water supply system through an inlet pipe and are connected to the water treatment system pool through a return pipe; the first cooling water tank is provided with a first overflow valve (7) at the top and a first drain valve (5) at the bottom; the second cooling water tank is provided with a second overflow valve (8) at the top and a second drain valve (6) at the bottom; the inlet pipe connected to the first cooling water tank is provided with a first return valve (2); the inlet pipe connected to the second cooling water tank is provided with a second inlet valve (3); the return pipe connected to the second cooling water tank is provided with a second return valve (4); the second cooling water tank is connected to a chilled water source through a chilled water inlet pipe, the chilled water inlet pipe is provided with a chilled water valve (9); the air supply pipeline is provided with a first thermometer (10) before passing through the first cooling water tank; A second thermometer (11) is provided on the air supply pipeline after passing through the first cooling water tank and before passing through the second cooling water tank, and a third thermometer (12) is provided on the air supply pipeline after passing through the second cooling water tank.

2. The long-distance raw material nitrogen delivery device according to claim 1 is characterized in that: The long-distance raw nitrogen gas delivery device further comprises a central control system (13), and the first thermometer (10), the second thermometer (11), and the third thermometer (12) are electrically connected to the central control system (13) to instantly feed back the measured temperature to the central control system (13).

3. The long-distance raw material nitrogen delivery device according to claim 2, characterized in that: The chilled water valve (9) is an electric regulating valve, which is electrically connected to the central control system (13). The central control system (13) controls the opening and closing and the opening degree of the chilled water valve (9) according to the real-time temperature feedback from the second thermometer (11) and the third thermometer (12).

4. The long-distance raw material nitrogen delivery device according to claim 2, characterized in that: The first water inlet valve (1) and the second water inlet valve (3) are both electric regulating valves, which are electrically connected to a central control system (13). The central control system (13) controls the opening of the first water inlet valve (1) and the second water inlet valve (3) according to the real-time temperature feedback from the first thermometer (10), the second thermometer (11), and the third thermometer (12).

5. The long-distance raw material nitrogen delivery device according to claim 3, characterized in that: The central control system (13) sets the temperature control of the third thermometer (12) to 25°C. When the real-time temperature measured by the third thermometer (12) is higher than 25°C, the central control system (13) opens the chilled water valve (9).

6. The long-distance raw material nitrogen delivery device according to claim 2, characterized in that: The central control system (13) is provided with a third thermometer (12) for alarm temperature control. When the real-time temperature of the third thermometer (12) is higher than the alarm temperature control, the central control system (13) issues an alarm reminder.

7. The long-distance raw material nitrogen delivery device according to claim 6, characterized in that: The alarm temperature is controlled at 28°C.

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