CN-121977328-A - System and process method for independently discharging large circulating water from water circulation of air separation oxygen-nitrogen water precooling system

CN121977328ACN 121977328 ACN121977328 ACN 121977328ACN-121977328-A

Abstract

The invention discloses a large circulating water system and a process method for independently discharging water circulation of a space division oxygen-nitrogen water precooling system, the system comprises a nitrogen water precooling water circulation system and a movable equipment water circulation system, and different cooling tower structures are designed aiming at two paths of water, so that equipment is convenient to clean and maintain. The invention constructs a physically isolated double-circulating water system to cool and separate the nitrogen water precooling process easy to be polluted from clean movable equipment. The closed circulation system eliminates the invasion of pollutants, and the open system is compatible with high pollution load and strengthens pollution discharge. Thoroughly solves the problems of deposition blockage and corrosion of the cooler. The manhole inspection can be realized once in three years, the inspection is good in effect, the amount of scraping rusty matters from the inner wall and cleaning sludge from the bottom is small, the abnormal occurrence during the operation is not worried any more, and the service life of the tower body is prolonged.

Inventors

WANG KUN
WANG LILI
LI HONGHAI
LI MINFENG

Assignees

泰山玻璃纤维有限公司

Dates

Publication Date: 20260505
Application Date: 20260303

Claims (10)

1. The water circulation independent large circulating water system of the air separation oxygen-nitrogen water precooling system is characterized by comprising a nitrogen water precooling water circulation system and a dynamic equipment water circulation system; The nitrogen water pre-cooling water circulation system comprises a nitrogen water pre-cooling circulation water tank, wherein the nitrogen water pre-cooling circulation water tank is connected to an air cooling tower and a water cooling tower in parallel through a first circulating water pipeline, the first circulating water pipeline is connected to the middle layer of the air cooling tower to perform primary cooling on air from an air compressor, and discharged water at the bottom of the water cooling tower is connected to the upper layer of the air cooling tower to further cool the air from the air compressor.
2. The large circulating water system independent of the water circulation of the air separation oxygen-nitrogen water precooling system according to claim 1, wherein the water discharged from the bottom of the air cooling tower is conveyed into an open cooling tower through a water pipe, the open cooling tower is arranged at the top of a nitrogen water precooling circulating water tank, and a fan and an air inlet louver are arranged at an air inlet of the open cooling tower.
3. The system for independently discharging large circulating water in a water circulation of an air separation oxygen-nitrogen water precooling system according to claim 1, wherein the nitrogen water precooling water circulation system is further provided with a dosing machine connected to a nitrogen water precooling circulating water tank.
4. The large circulating water system independent of the water circulation of the air separation oxygen-nitrogen water precooling system according to claim 1 is characterized in that a nitrogen water precooling circulating water pump is arranged on a first circulating water pipeline, a nitrogen water precooling cooling water pump is arranged on a water pipe connected to an air cooling tower and then connected to the middle layer of the air cooling tower, and a nitrogen water precooling freezing water pump and a refrigerator are sequentially arranged on the water pipe connected to the bottom of the water cooling tower and the upper layer of the air cooling tower.
5. The system according to claim 1, wherein the water circulation system of the mobile device comprises a closed circulation water tank, which is a closed container, and is connected in parallel to the air compressor unit, the refrigerant condenser and the expansion unit through a second circulation water pipeline, and then is connected to a closed water cooling tower arranged above the closed circulation water tank, and the second circulation water pipeline is provided with a closed circulation water pump at a water outlet of the closed circulation water tank.
6. The large circulating water system independent of the water circulation of the air separation oxygen-nitrogen water precooling system according to claim 5, wherein the closed water cooling tower is integrally closed, meanwhile, a water coil is arranged inside the closed water cooling tower, and circulating water of automatic equipment is connected into a water coil pipe and then is conveyed into a closed circulating water pool.
7. The system of claim 6, wherein the mobile device comprises an air compressor unit, a refrigerant condenser and an expansion unit.
8. The independent water circulation large-circulating water system of the air separation oxygen-nitrogen water precooling system is characterized in that the closed water cooling tower is not directly connected with a closed circulating water tank, the bottom of the closed water cooling tower is communicated with a closed water storage tank, the closed water storage tank is connected to the top of the closed water cooling tower through a spray circulating pipe, a water outlet is provided with a spray head, a water tray pipe in the closed water cooling tower is sprayed and cooled, and a spray circulating pump is arranged on the spray circulating pipe.
9. The process method for independently discharging large circulating water from the water circulation of the air separation oxygen-nitrogen water precooling system is characterized in that the process method is based on the water circulation of the air separation oxygen-nitrogen water precooling system according to any one of claims 1-8, and comprises a water circulation process of a dynamic device and a water circulation process of the nitrogen water precooling system; According to the water circulation process of the movable equipment, circulating water in a closed circulating water tank is pumped and pressurized to enter a circulating pipe network of the movable equipment under the drive of a closed circulating water pump, enters a backwater circulating pipe network after heat exchange of equipment coolers and oil coolers, is sent to a cooling pipe of a closed water cooling tower, and is collected and falls into the closed circulating water tank after cooling.
10. The process method for independently discharging large circulating water from water circulation of air separation oxygen-nitrogen water precooling system according to claim 9, wherein in the water circulation process of the nitrogen water precooling system, after the circulating water in a nitrogen water precooling circulating water tank is pumped and pressurized by a nitrogen water precooling circulating water pump, a part of the circulating water is pressurized by a nitrogen water precooling cooling water pump to the middle part of an air cooling tower to perform countercurrent heat exchange washing cooling with air, and the other part of the circulating water is supplied to the top part of the water cooling tower to perform countercurrent heat exchange cooling with polluted nitrogen, and falls back to water at the bottom part of the water cooling tower and is pressurized by a nitrogen water precooling freezing water pump to the top part of the air cooling tower to perform countercurrent heat exchange washing cooling with air.

Description

System and process method for independently discharging large circulating water from water circulation of air separation oxygen-nitrogen water precooling system Technical Field The invention belongs to the technical field of air separation, and particularly relates to a large circulating water independent water outlet system of a water-cooling system for preparing oxygen and nitrogen through air separation and a process method. Background The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. The air separation technology is a process for separating oxygen and nitrogen from air by utilizing the principle that the physical properties of all components in the air are different. The air separation process generally comprises the steps of firstly filtering impurities with larger particles by an air filter from air in the external environment, secondly compressing the air by an air compressor to obtain air with higher pressure, then cooling and precooling the compressed air by cooling equipment to obtain air with lower temperature, introducing the air into a purification system to remove moisture and other gas impurities in the air, and finally sending high-pressure pure air into a fractionating tower to be separated to obtain liquid oxygen and liquid nitrogen. The current cryogenic air separation equipment and the matched circulating water system are in the form of a water single-circulation structure, and the circulating water adopts a circulating water tank and a set of cooling towers in a running mode similar to the structure provided by the published patent CN121206835A, and the main function of the circulating water is to cool and wash the air in a nitrogen pre-cooling system by oil and gas of key moving equipment (comprising an air compressor unit, a refrigerant condenser and an expansion unit). And circulating water flows through the nitrogen water precooling system and the dynamic equipment cooling system, wherein mechanical particle impurities such as dust and chemical substances (such as SO 2、Cl2) in compressed air enter the circulating water together when hot air is subjected to heat exchange, cooling and washing in an air cooling tower of the nitrogen water precooling system, and finally return to a circulating water tank in a water return pipeline. Because the equipment water and the air cooling and washing water share a common water tank and a circulating water pipeline, dust suspended matters exist at the bottoms of the circulating water tank and the water tank after the equipment water and the air cooling and washing water are used for a plurality of times. Through continuous recycling, the dust suspended matters finally enter a movable equipment cooler for deposition, water quality cleaning is required, the cooling of the cooler and pitting corrosion and scale corrosion on pipelines and the cooler are seriously influenced by water with suspended matters, heat exchange is influenced, and potential safety hazards of equipment are caused. Although the inlet of the air compressor is provided with a self-cleaning filter and the circulating water is provided with a dosing system, because the air separation device runs continuously throughout the year, when the machine is stopped for maintenance, a large amount of sediment exists at the bottoms of the equipment cooler, the air cooling tower and the water cooling tower. Therefore, the pollutant introduced by the nitrogen water precooling system can cause the reduction of the heat exchange efficiency of the cooler, the service life of the equipment can be obviously shortened due to corrosion, and the annual maintenance cost is greatly increased due to frequent shutdown and cleaning. Disclosure of Invention In order to solve the problems, the invention provides a large air separation circulation system for independently discharging water used by a nitrogen water precooling system in an air separation device. Thus, the space division operation forms two paths of water for cooling. One path is closed circulating water (provided with an independent water tank and a closed cooling tower) for cooling the movable equipment, and the other path is independent circulating water (provided with an independent water tank and an open cooling tower) for a nitrogen water precooling system, so that the pollution source and a clean cooling system are isolated, and meanwhile, different cooling tower structures are designed for the two paths of water, so that the equipment is convenient to clean and maintain. The above object is achieved by the following technical scheme: in a first aspect, the invention provides a large circulating water system independent of water circulation of a space-division oxygen-nitrogen water precooling system, which comprises a nitrogen water precooling water circulation system and a dynamic equipment water circulation system; The nitrogen water pre-cooling wate