A condensate water cold energy step-by-step recycling system of a liquid nitrogen vaporizer

Abstract

A kind of condensate water cooling capacity step-by-step recovery system of liquid nitrogen vaporizer, including liquid nitrogen vaporizer, first three-way valve is equipped on the liquid nitrogen vaporizer drain pipeline, first three-way valve first end is connected with the drain pipeline of liquid nitrogen vaporizer, first three-way valve second end connects first pipe heat exchanger cooling water inlet end, first three-way valve third end connects low-temperature condensate water using piece, pipeline booster pump is equipped on the pipeline between first three-way valve and liquid nitrogen vaporizer, the hot fluid inlet end of first pipe heat exchanger and hot fluid outlet end are all connected to low-temperature condensate water using piece, first pipe heat exchanger cooling water outlet end is connected with room temperature condensate water using piece, the drain of low-temperature condensate water using piece is connected with room temperature condensate water using piece, the drain of room temperature condensate water using piece is connected to water storage pool.The utility model aims at avoiding the problem that water resource waste and cold quantity waste are caused by direct discharge condensate water.

Description

Technical Field

[0001] This utility model relates to the field of condensate recovery, specifically a tiered condensate cooling capacity recovery system for a liquid nitrogen vaporizer. Background Technology

[0002] A liquid nitrogen vaporizer is a device used to convert liquid nitrogen into gaseous nitrogen. During the vaporization process, the liquid nitrogen absorbs heat intensely near the vaporizer wall, causing the wall temperature to be significantly lower than the ambient temperature. When gaseous moisture in the air comes into contact with this low-temperature surface, it condenses into liquid water. Currently, this condensate is often not recycled in actual production and is directly discharged into the surrounding environment. It is worth noting that the temperature of the condensate produced during the operation of the liquid nitrogen vaporizer is close to the ambient temperature near the liquid nitrogen. Since the temperature of liquid nitrogen is -196℃, the temperature of the condensate is typically around 0℃ due to the influence of the liquid nitrogen temperature. If the condensate cannot be recycled, not only is a usable water source lost, but the cooling energy contained in the condensate is also wasted. Utility Model Content

[0003] The present invention aims to provide a tiered condensate cooling capacity recovery system for liquid nitrogen vaporizers to avoid the waste of water resources and cooling capacity caused by direct discharge of condensate.

[0004] To solve the above technical problems, the specific solution adopted by this utility model is as follows: It includes a liquid nitrogen vaporizer, a first three-way valve is provided on the drain pipe of the liquid nitrogen vaporizer, the first end of the first three-way valve is connected to the drain pipe of the liquid nitrogen vaporizer, the second end of the first three-way valve is connected to the cooling water inlet of the first tubular heat exchanger, the third end of the first three-way valve is connected to a low-temperature condensate component, a pipeline booster pump is provided on the pipeline between the first three-way valve and the liquid nitrogen vaporizer, the hot fluid inlet and hot fluid outlet of the first tubular heat exchanger are both connected to the medium-low temperature condensate component, the cooling water outlet of the first tubular heat exchanger is connected to the room temperature condensate component, the drain outlet of the low-temperature condensate component is connected to the room temperature condensate component, and the drain outlet of the room temperature condensate component is connected to a water storage tank.

[0005] Further optimization of the condensate cooling capacity recovery system for a liquid nitrogen vaporizer: A filter screen is installed on the pipeline between the liquid nitrogen vaporizer and the pipeline booster pump.

[0006] Further optimization of the condensate cooling capacity recovery system for liquid nitrogen vaporizers: A check valve is installed at the outlet of the pipeline booster pump.

[0007] Further optimization of a condensate cooling capacity recovery system for a liquid nitrogen vaporizer: A second three-way valve is provided at the outlet of the check valve. The first end of the second three-way valve is connected to the check valve, the second end of the second three-way valve is connected to the first three-way valve, the third end of the second three-way valve is connected to the cold accumulator, and the cold water outlet of the cold accumulator is connected to the first three-way valve.

[0008] Further optimization of the condensate cooling capacity recovery system for a liquid nitrogen vaporizer: An emergency drain valve is installed on the outlet pipe of the accumulator, and the outlet of the emergency drain valve leads to the water storage tank.

[0009] As a further optimization of the condensate cooling capacity recovery system of a liquid nitrogen vaporizer: a second tubular heat exchanger is provided between the room temperature condensate user and the liquid nitrogen vaporizer. The cooling water inlet of the second tubular heat exchanger is connected to the drain pipe of the liquid nitrogen vaporizer. The hot fluid inlet and hot fluid outlet of the second tubular heat exchanger are both connected to the room temperature condensate user. The cooling water outlet of the second tubular heat exchanger is connected to a water storage tank.

[0010] Further optimization of a condensate cooling capacity recovery system for a liquid nitrogen vaporizer: A filter is installed at the inlet of the water storage tank, and the drain outlet of the room temperature condensate and the cooling water outlet of the second tubular heat exchanger are both connected to the filter.

[0011] Further optimization of a condensate cooling capacity recovery system for a liquid nitrogen vaporizer: a coarse filter screen, an activated carbon layer, and a fine filter screen are sequentially arranged along the water flow direction inside the filter.

[0012] Further optimization of a tiered condensate cooling capacity recovery system for liquid nitrogen vaporizers: temperature sensors for detecting condensate temperature are installed in the low-temperature condensate user unit, the medium-low temperature condensate user unit, and the room temperature condensate user unit.

[0013] Further optimization of a condensate cooling capacity recovery system for a liquid nitrogen vaporizer: the low-temperature condensate component is a low-temperature chemical additive storage tank water cooling system, the medium-low temperature condensate component is a temperature control room chiller, and the room temperature condensate component is a high-temperature smelting furnace water cooling system.

[0014] Beneficial effects: This utility model, through the design of a condensate cooling capacity recovery and utilization system including a low-temperature condensate user component, a medium-low temperature condensate user component, and a room temperature condensate user component, not only realizes the recovery of water resources of a large amount of condensate generated during the operation of the liquid nitrogen vaporizer, but also efficiently recovers the cooling capacity contained in the condensate. The tiered recovery method also avoids the energy waste problem caused by a single cooling capacity recovery path.

[0015] This invention solves the problem of wasted cooling capacity caused by fluctuations in cooling demand from downstream users by storing unused condensate cooling capacity through a cold storage device, and further improves the overall condensate cooling capacity recovery efficiency of the system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the condensate cooling capacity recovery system of this utility model. The following are labeled in the diagram: 1. Liquid nitrogen vaporizer, 2. Filter screen, 3. Pipeline booster pump, 4. Check valve, 5. Second three-way valve, 6. Cold accumulator, 7. Emergency drain valve, 8. Water storage tank, 9. Filter, 10. Second tubular heat exchanger, 11. Room temperature condensate component, 12. Medium and low temperature condensate component, 13. First tubular heat exchanger, 14. First three-way valve, 15. Temperature sensor, 16. Low temperature condensate component. Detailed Implementation

[0017] A tiered condensate cooling recovery system for a liquid nitrogen vaporizer includes a liquid nitrogen vaporizer 1. During operation, the liquid nitrogen vaporizer 1 absorbs heat from the surrounding environment as it vaporizes, causing gaseous water in the environment to turn into liquid water upon cooling. The liquid water then accumulates to produce a large amount of condensate.

[0018] A first three-way valve 14 is installed on the drain pipe of the liquid nitrogen vaporizer 1. The first end of the first three-way valve 14 is connected to the drain pipe of the liquid nitrogen vaporizer 1, and the third end of the first three-way valve 14 is connected to the low-temperature condensate supply component 16. The temperature of the condensate discharged from the liquid nitrogen vaporizer 1 is close to 0°C, while the low-temperature condensate supply component 16 only requires condensate at a lower temperature. In this embodiment, the low-temperature condensate supply component 16 is a water cooling system for a low-temperature chemical additive storage tank.

[0019] A pipeline booster pump 3 is installed on the pipeline between the first three-way valve 14 and the liquid nitrogen vaporizer 1. The pipeline booster pump 3 provides sufficient power for the transportation of condensate in the pipeline.

[0020] The second end of the first three-way valve 14 is connected to the cooling water inlet of the first tubular heat exchanger 13. Both the hot fluid inlet and outlet of the first tubular heat exchanger 13 are connected to the low-temperature condensate water receiving unit 12. Through the first tubular heat exchanger 13, the cooling capacity of the condensate is transferred to the fluid in the low-temperature condensate water receiving unit 12, thus completing the recovery and utilization of the condensate's cooling capacity. In this embodiment, the low-temperature condensate water receiving unit 12 is a temperature control room refrigerator.

[0021] The cooling water outlet of the first tubular heat exchanger 13 is connected to the room temperature condensate water user 11. After the condensate water exchanges heat with the fluid in the medium-low temperature condensate water user 12 in the first heat exchanger, the condensate water temperature has risen, but it is still lower than the ambient temperature. The room temperature condensate water user 11 reuses this type of low-temperature condensate water, thus fully recovering the cooling capacity of the condensate water. In this embodiment, the room temperature condensate water user 11 is a water cooling system for a high-temperature smelting furnace.

[0022] The drain outlet of the low-temperature condensate water user 16 is connected to the room-temperature condensate water user 11, and the drain outlet of the room-temperature condensate water user 11 is connected to the water storage tank 8. After passing through the low-temperature condensate water user 16, the condensate water temperature is close to room temperature. This type of condensate water is then circulated back into the room-temperature condensate water user 11 for full utilization. After passing through the staged recovery system, the cold energy contained in the condensate water is fully recovered. The condensate water with recovered cold energy is discharged from the drain outlet of the room-temperature condensate water user 11 to the water storage tank 8. The water storage tank 8 collects the condensate water with recovered cold energy to achieve water resource recovery.

[0023] A filter screen 2 is installed on the pipeline between the liquid nitrogen vaporizer 1 and the pipeline booster pump 3. The condensate discharged from the liquid nitrogen vaporizer 1 has a low temperature and may be a mixture of ice and water. The filter screen 2 filters out the ice in the condensate to protect the pipeline booster pump 3 for normal operation.

[0024] The pipeline booster pump 3 is equipped with a check valve 4 at the outlet end. In actual operation, it was found that when the pipeline booster pump 3 stops, due to the large water pressure at the downstream end, water will flow back into the liquid nitrogen vaporizer 1. The design of the check valve 4 prevents the backflow of condensate and improves the condensate recovery efficiency.

[0025] A second three-way valve 5 is installed at the outlet of check valve 4. The first end of the second three-way valve 5 is connected to check valve 4, the second end of the second three-way valve 5 is connected to the first three-way valve 14, and the third end of the second three-way valve 5 is connected to the cold water accumulator 6. The cold water outlet of the cold water accumulator 6 is connected to the first three-way valve 14. The cold water accumulator 6 stores the unused cooling capacity of the condensate, solving the problem of cooling capacity waste caused by fluctuations in the cooling capacity demand of downstream users, and further improving the overall condensate cooling capacity recovery efficiency of the system.

[0026] An emergency drain valve 7 is installed on the outlet pipe of the cold accumulator 6, and the outlet of the emergency drain valve 7 leads to the water storage tank 8. When the cold storage capacity of the cold accumulator 6 is full and the downstream cannot fully receive it, the condensate can flow through the cold accumulator 6 directly to the water storage tank 8, ensuring the normal operation of the liquid nitrogen vaporizer 1.

[0027] A second tubular heat exchanger 10 is installed between the room temperature condensate user unit 11 and the liquid nitrogen vaporizer 1. The cooling water inlet of the second tubular heat exchanger 10 is connected to the drain pipe of the liquid nitrogen vaporizer 1, and both the hot fluid inlet and outlet of the second tubular heat exchanger 10 are connected to the room temperature condensate user unit 11. The cooling water outlet of the second tubular heat exchanger 10 is connected to the water storage tank 8. The cold source of the room temperature condensate user unit 11 comes from the first tubular heat exchanger 13 and the low temperature condensate user unit 16. To prevent the room temperature condensate user unit 11 from losing cooling due to the upstream equipment being saturated, the second tubular heat exchanger 10 is installed to directly connect the room temperature condensate user unit 11 to the liquid nitrogen vaporizer 1. The second tubular heat exchanger 10 recovers the cooling capacity of the condensate discharged from the liquid nitrogen vaporizer 1 and transfers it to the fluid inside the room temperature condensate user unit 11, thereby ensuring stable cooling.

[0028] A filter 9 is installed at the inlet of the water storage tank 8. The drain outlet of the room temperature condensate component 11 and the cooling water outlet of the second tubular heat exchanger 10 are both connected to the filter 9. Actual testing shows that the calcium and chloride ion content in the condensate produced by the liquid nitrogen vaporizer 1 is 0. This condensate can be used in most scenarios. However, the condensate easily carries some contaminants after passing through the recycling system. The filter 9 filters out the contaminants carried by the condensate to improve water quality and facilitate subsequent use.

[0029] The filter 9 contains a coarse filter screen, an activated carbon layer, and a fine filter screen arranged sequentially along the water flow direction. The coarse filter screen 2 mainly removes large particulate impurities (rust, scale) from the water, the activated carbon layer mainly adsorbs organic pollutants and odors from the water, and the fine filter screen mainly filters out small particulate matter (carbon powder, etc.) from the water.

[0030] The low-temperature condensate user 16, the medium-low temperature condensate user 12, and the room temperature condensate user 11 are all equipped with a temperature sensor 15 for detecting the condensate temperature. The temperature sensor 15 can monitor the condensate temperature at each stage in real time, ensuring that the cold energy recovery process operates efficiently according to the designed temperature gradient, while avoiding equipment efficiency reduction or damage due to improper temperature.

[0031] A method for using a tiered cooling capacity recovery system for condensate from a liquid nitrogen vaporizer: The liquid nitrogen vaporizer 1 generates a large amount of condensate during operation. After being pressurized by a pipeline booster pump 3, the condensate is distributed by a first three-way valve 14 to a low-temperature condensate user 16 for direct use. The used condensate is then transported to a room-temperature condensate user 11 for further cooling capacity recovery. The remaining condensate enters a first tubular heat exchanger 13 to exchange heat with a medium-low temperature condensate user 12. The heated condensate is also transported to a room-temperature condensate user 11 for further cooling capacity recovery. Unused cooling capacity is temporarily stored in the cold storage tank 6. When both the cooling capacity user and the cold storage tank 6 are saturated, in order to ensure the normal operation of the liquid nitrogen vaporizer 1, the condensate produced by the liquid nitrogen vaporizer 1 is directly discharged to the water storage tank 8 through the emergency drain valve 7 of the cold storage tank 6. The second tubular heat exchanger 10 is directly connected to the liquid nitrogen vaporizer 1 as a backup cold source for the room temperature condensate user 11 to ensure stable cooling supply. All the condensate produced by the liquid nitrogen vaporizer 1 is finally discharged into the water storage tank 8 after passing through the filter 9, realizing the dual recovery of cooling capacity and water resources.

Claims

1. A tiered condensate cooling capacity recovery system for a liquid nitrogen vaporizer, characterized in that: The system includes a liquid nitrogen vaporizer (1), a first three-way valve (14) on the drain pipe of the liquid nitrogen vaporizer (1), the first end of the first three-way valve (14) is connected to the drain pipe of the liquid nitrogen vaporizer (1), the second end of the first three-way valve (14) is connected to the cooling water inlet of the first tubular heat exchanger (13), the third end of the first three-way valve (14) is connected to the low temperature condensate user (16), a pipeline booster pump (3) is provided on the pipeline between the first three-way valve (14) and the liquid nitrogen vaporizer (1), the hot fluid inlet and hot fluid outlet of the first tubular heat exchanger (13) are both connected to the medium and low temperature condensate user (12), the cooling water outlet of the first tubular heat exchanger (13) is connected to the room temperature condensate user (11), the drain outlet of the low temperature condensate user (16) is connected to the room temperature condensate user (11), and the drain outlet of the room temperature condensate user (11) is connected to the water storage tank (8).

2. The condensate cooling capacity recovery system for a liquid nitrogen vaporizer according to claim 1, characterized in that: A filter screen (2) is installed on the pipeline between the liquid nitrogen vaporizer (1) and the pipeline booster pump (3).

3. The condensate cooling capacity recovery system for a liquid nitrogen vaporizer according to claim 1, characterized in that: The pipeline booster pump (3) is equipped with a check valve (4) at the outlet end.

4. The condensate cooling capacity recovery system for a liquid nitrogen vaporizer according to claim 3, characterized in that: The outlet end of the check valve (4) is provided with a second three-way valve (5). The first end of the second three-way valve (5) is connected to the check valve (4), the second end of the second three-way valve (5) is connected to the first three-way valve (14), the third end of the second three-way valve (5) is connected to the cold accumulator (6), and the cold water outlet of the cold accumulator (6) is connected to the first three-way valve (14).

5. A tiered condensate cooling capacity recovery system for a liquid nitrogen vaporizer according to claim 4, characterized in that: An emergency drain valve (7) is provided on the outlet pipe of the cold storage tank (6), and the outlet of the emergency drain valve (7) leads to the water storage tank (8).

6. A tiered condensate cooling capacity recovery system for a liquid nitrogen vaporizer according to claim 1, characterized in that: A second tubular heat exchanger (10) is provided between the room temperature condensate user (11) and the liquid nitrogen vaporizer (1). The cooling water inlet end of the second tubular heat exchanger (10) is connected to the drain pipe of the liquid nitrogen vaporizer (1). The hot fluid inlet end and the hot fluid outlet end of the second tubular heat exchanger (10) are both connected to the room temperature condensate user (11). The cooling water outlet end of the second tubular heat exchanger (10) is connected to the water storage tank (8).

7. A tiered condensate cooling capacity recovery system for a liquid nitrogen vaporizer according to claim 6, characterized in that: The inlet of the water storage tank (8) is equipped with a filter (9), and the drain outlet of the room temperature condensate (11) and the cooling water outlet of the second tubular heat exchanger (10) are both connected to the filter (9).

8. A tiered condensate cooling capacity recovery system for a liquid nitrogen vaporizer according to claim 7, characterized in that: The filter (9) is arranged with a coarse filter screen, an activated carbon layer and a fine filter screen in sequence along the water flow direction.

9. A tiered condensate cooling capacity recovery system for a liquid nitrogen vaporizer according to claim 1, characterized in that: Temperature sensors (15) for detecting the temperature of condensate are provided in the low-temperature condensate user unit (16), the medium-low temperature condensate user unit (12), and the room temperature condensate user unit (11).

10. A tiered condensate cooling capacity recovery system for a liquid nitrogen vaporizer according to claim 1, characterized in that: The low-temperature condensate component (16) is a water cooling system for a low-temperature chemical additive storage tank, the medium-low temperature condensate component (12) is a refrigerator for a temperature control room, and the room temperature condensate component (11) is a water cooling system for a high-temperature smelting furnace.

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