Air separation system non-condensable gas cooling capacity recycling device

Abstract

The utility model discloses an air separation system non-condensable gas cooling capacity recycling device which comprises a first non-condensable gas conveying pipeline connected with a pure argon condensing evaporator and a second non-condensable gas conveying pipeline connected with a main cooling evaporator, the pure argon condensing evaporator outputs non-condensable gas of the pure argon condensing evaporator, and the main cooling evaporator outputs main cooling non-condensable gas. A first valve is arranged on the first non-condensable gas conveying pipeline, a second valve is arranged on the second non-condensable gas conveying pipeline, and the first non-condensable gas conveying pipeline and the second non-condensable gas conveying pipeline are jointly connected with a conveying pipeline. The cooling capacity recovery device is simple in structure, the safety and cooling capacity recovery effects are achieved at the same time, the pressure during the cooling capacity recovery period is monitored, non-condensable gas is evenly distributed in the cooling tower of the circulating water pool for sufficient heat exchange, the circulating water temperature is reduced, the reduced circulating water is cooled through the three compressor units, and the cooling efficiency is improved. The isothermal compression efficiency of the unit is improved, the working energy consumption of the refrigerating unit is reduced, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of air separation devices, in particular to a device for recovering and utilizing the cold amount of non-condensable gas in an air separation system. Background Art

[0002] The discharge of non-condensable gas is an indispensable part of the air separation equipment. One part of it is the non-condensable gas (including rare gases such as neon and helium) produced by the nitrogen at the top of the lower tower in the air separation tower entering the main condenser evaporator for heat exchange with liquid oxygen. Because it is not easy to condense, it accumulates in the main condenser evaporator (hereinafter referred to as the main cooling) and affects the heat exchange of the main cooling, so this part of the gas needs to be discharged. The other part is the non-condensable gas (mainly inert gas nitrogen) produced after the crude argon enters the refined argon tower condenser evaporator and exchanges heat with liquid nitrogen. Because this part of the gas accumulates in the refined argon tower condenser evaporator and affects the heat exchange, and also affects the quality of argon, so this part of the gas needs to be discharged in time. The two parts of gas in the existing air separation equipment are directly discharged into the atmosphere, resulting in cooling loss and energy waste.

[0003] The following documents were searched: (1) Application No.: CN202320648313.2 Non-condensable gas recovery device and air separation system, (2) Application No.: CN201820583469.6 A device for heat exchange of non-condensable gas to obtain cold conversion, (3) Application No.: CN202121105077.7 A low-temperature non-condensable gas recovery device. It can be seen that at present, in the technical field of non-condensable gas and non-condensable gas cold recovery in air separation system, the main focus is on the recovery and separation of non-condensable gas generated by the air separation process to obtain a neon-helium mixed gas with high added value, thereby improving economic benefits. Another method is to recover this part of non-condensable gas into dirty nitrogen gas and pass it into a water cooling tower to reduce the temperature of the chilled water, or pass it into an air cooling tower to use a newly added heat exchange device to reduce the water temperature, thereby reducing the energy consumption of the refrigeration unit and achieving the purpose of energy saving. It is very difficult to implement these methods on the existing equipment, which limits the possibility of implementation on the existing equipment. Therefore, a non-condensable gas cold recovery and utilization device for air separation system is proposed. Summary of the invention

[0004] Technical issues solved

[0005] The utility model aims to make up for the deficiencies of the prior art and provides a device for recovering and utilizing the cold energy of non-condensable gas in an air separation system.

[0006] Technical Solution

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a non-condensable gas cold recovery and utilization device for an air separation system, comprising a non-condensable gas delivery pipeline 1 connected to a refined argon condensing evaporator, a non-condensable gas delivery pipeline 2 connected to a main cooling evaporator, the refined argon condensing evaporator outputs refined argon condensing evaporator non-condensable gas, and the main cooling evaporator outputs main cooling non-condensable gas, the non-condensable gas delivery pipeline 1 is provided with a valve 1, the non-condensable gas delivery pipeline 2 is provided with a valve 2, the non-condensable gas delivery pipeline 1 and the non-condensable gas delivery pipeline 2 are connected to a delivery pipeline together, the delivery pipeline is sequentially provided with a pressure transmitter, a safety valve and a check valve, the output end of the delivery pipeline is connected to a gas distributor, the utility model has a simple structure, meets the effects of safety and cold recovery at the same time, monitors the pressure during cold recovery, and evenly distributes the non-condensable gas in a circulating water pool cooling tower for sufficient heat exchange, so that the circulating water temperature is reduced, and the reduced circulating water is cooled by three major compressor units, thereby improving the isothermal compression efficiency of the unit and reducing the working energy consumption of the refrigeration unit, thereby achieving the effect of energy saving.

[0008] Preferably, it also includes a circulating water pool cooling tower, and the gas distributor is arranged in the lower layer of the circulating water pool cooling tower filler.

[0009] Preferably, the gas distributor is located at cm-cm in the lower layer of the circulating water pool cooling tower packing.

[0010] Preferably, the input end of the delivery pipeline is connected to the output end of the non-condensable gas delivery pipeline 1 and the output end of the non-condensable gas delivery pipeline 2.

[0011] Preferably, the pressure transmitter, the safety valve and the check valve are arranged in sequence along the gas delivery direction of the delivery pipeline. Beneficial Effects

[0012] Compared with the prior art, the air separation system non-condensable gas cooling capacity recovery and utilization device has the following beneficial effects:

[0013] The utility model has a simple structure and meets the effects of safety and cold recovery. It monitors the pressure during cold recovery and evenly distributes the non-condensable gas in the circulating water pool cooling tower for sufficient heat exchange, thereby reducing the circulating water temperature. The reduced circulating water is cooled by three major compressor units, thereby improving the isothermal compression efficiency of the unit and reducing the working energy consumption of the refrigeration unit, thereby achieving energy-saving effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the delivery pipeline of the utility model.

[0016] In the figure:

[0017] 1. Valve 1; 2. Valve 2; 3. Pressure transmitter; 4. Safety valve; 5. Check valve; 6. Gas distributor; 7. Non-condensable gas delivery pipeline 1; 8. Non-condensable gas delivery pipeline 2; 9. Delivery pipeline. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-2 As shown, the utility model provides a technical solution: a non-condensable gas cold recovery and utilization device for an air separation system, comprising a non-condensable gas delivery pipeline 1 7 connected to a refined argon condensing evaporator, a non-condensable gas delivery pipeline 2 8 connected to a main cooling evaporator, the refined argon condensing evaporator outputs refined argon condensing evaporator non-condensable gas, the main cooling evaporator outputs main cooling non-condensable gas, a valve 1 is arranged on the non-condensable gas delivery pipeline 1 7, a valve 2 2 is arranged on the non-condensable gas delivery pipeline 2 8, the non-condensable gas delivery pipeline 1 7 and the non-condensable gas delivery pipeline 2 8 are connected to a delivery pipeline 9 together, a pressure transmitter 3, a safety valve 4 and a check valve 5 are arranged on the delivery pipeline 9 in sequence, and the output end of the delivery pipeline 9 is connected to a gas distributor 6. The utility model has a simple structure, meets the effects of safety and cold recovery at the same time, monitors the pressure during cold recovery, and evenly distributes the non-condensable gas in the circulating water pool cooling tower for sufficient heat exchange, so that the circulating water temperature is reduced, and the reduced circulating water is cooled by three major compressor units, thereby improving the isothermal compression efficiency of the unit and reducing the working energy consumption of the refrigeration unit, thereby achieving the effect of energy saving.

[0020] The device also includes a circulating water pool cooling tower, and a gas distributor 6 is arranged in the lower layer of the circulating water pool cooling tower packing. The gas distributor 6 is located in the range of 20cm-80cm in the lower layer of the circulating water pool cooling tower packing, wherein the optimal depth is 50cm. The non-condensable gas from the refined argon condenser evaporator passes through valve 1 and is mixed with the non-condensable gas from the main cooling through valve 2, and then passes through the check valve 5 into the gas distributor 6 distributed about 50cm in the lower layer of the circulating water pool cooling tower packing, and is evenly discharged into the circulating water pool cooling tower to exchange heat with the downstream circulating water. The dry non-condensable gas with reduced temperature is introduced into the circulating water cooling tower to fully exchange heat with the downstream circulating water, so that the outlet water temperature of the circulating water system is reduced, thereby achieving the purpose of reducing the circulating water temperature.

[0021] The input end of the delivery pipeline 9 in the present application is connected to the output end of the non-condensable gas delivery pipeline 1 7 and the output end of the non-condensable gas delivery pipeline 2 8. The pressure transmitter 3, the safety valve 4 and the check valve 5 are arranged in sequence along the gas delivery direction of the delivery pipeline 9. The safety valve 4 is installed between the valve 1 1, the valve 2 2 and the check valve 5 to prevent the distributor from being blocked and overpressured. The pressure transmitter 3 is installed between the valve 1 1, the valve 2 2 and the check valve 5 to monitor the pressure in the pipeline in real time.

[0022] Working principle: The non-condensable gas from the refined argon condenser evaporator passes through valve 1 and is mixed with the non-condensable gas from the main cooling through valve 2, and then passes through the check valve 5 into the gas distributor 6 distributed about 50 cm below the filling layer of the circulating water pool cooling tower, and is evenly discharged into the circulating water pool cooling tower to exchange heat with the downstream circulating water. The two groups of non-condensable gases are kept warm before leaving the cold box section and entering the circulating water pool cooling tower to reduce the loss of cold capacity.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for recovering and utilizing the cold energy of non-condensable gas in an air separation system, characterized in that: The invention comprises a non-condensable gas delivery pipeline (7) connected to a refined argon condenser evaporator and a non-condensable gas delivery pipeline (8) connected to a main cooling evaporator. The refined argon condenser evaporator outputs refined argon condenser evaporator non-condensable gas, and the main cooling evaporator outputs main cooling non-condensable gas. The non-condensable gas delivery pipeline (7) is provided with a valve (1), and the non-condensable gas delivery pipeline (8) is provided with a valve (2). The non-condensable gas delivery pipeline (7) and the non-condensable gas delivery pipeline (8) are connected to a delivery pipeline (9) together. The delivery pipeline (9) is provided with a pressure transmitter (3), a safety valve (4) and a check valve (5) in sequence. The output end of the delivery pipeline (9) is connected to a gas distributor (6).

2. The device for recovering and utilizing the non-condensable gas cold energy of an air separation system according to claim 1, characterized in that: It also includes a circulating water pool cooling tower, and the gas distributor (6) is arranged in the lower layer of the circulating water pool cooling tower filler.

3. The device for recovering and utilizing cold energy of non-condensable gas in an air separation system according to claim 1, characterized in that: The gas distributor (6) is located at 20 cm to 80 cm below the filling layer of the circulating water pool cooling tower.

4. The device for recovering cold energy of non-condensable gas in an air separation system according to claim 1, characterized in that: The input end of the delivery pipeline (9) is connected to the output end of the non-condensable gas delivery pipeline 1 (7) and the output end of the non-condensable gas delivery pipeline 2 (8).

5. The device for recovering and utilizing cold energy of non-condensable gas in an air separation system according to claim 1, characterized in that: The pressure transmitter (3), the safety valve (4) and the check valve (5) are arranged in sequence along the gas delivery direction of the delivery pipeline (9).

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