Optimized water temperature adjusting pipeline of air separation unit

Abstract

The utility model belongs to the technical field of air separation units, and relates to an air separation unit optimized water temperature adjusting pipeline which comprises an air compressor, the air compressor is connected with an air compressor cooler, the rear side of the air compressor is connected with an air cooling tower, the top of the air cooling tower is connected to a molecular sieve, the molecular sieve is connected to a fractionating tower, and an oxygen pipeline and a nitrogen pipeline are led out of the fractionating tower respectively. An oxygen compressor and an oxygen compressor cooler are arranged on the oxygen pipeline, a nitrogen compressor and a nitrogen compressor cooler are arranged on the nitrogen pipeline, and the air compressor cooler, the top of the water cooling tower, the oxygen compressor cooler and the nitrogen compressor cooler are connected with one another through connecting pipelines. A leading-out pipeline led out of the connecting pipeline is connected to the circulating water tank. Different environments, air temperatures and temperatures are distinguished, cooling parts are adjusted in a targeted mode, energy consumption is reduced, circulating water is cooled from the source, and electricity consumption of intermediate refrigeration equipment and a compressor is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of air separation units, and particularly relates to an optimized water temperature regulation pipeline for an air separation unit. Background Technique

[0002] For the oxygen production unit of the public auxiliary system supporting the steel mill, the oxygen production unit uses the deep freezing method to separate air and provides industrial gas media such as high-purity oxygen, nitrogen, and argon for the steel mill users. Among them, the circulating water system is the key system of the oxygen production unit, mainly used to cool the processed air and the compressor.

[0003] The circulating water system is mainly equipped with a water tank, a fan, a water pump, etc. The low-temperature circulating water is sent into the air cooling tower and the compressor, and the high-temperature water carrying heat returns to the water tank and is cooled by the fan. Due to the different regional locations and seasonal alternations in the factory area, the processed air and the ambient temperature are different, and the change of the circulating water temperature is also different.

[0004] In the past, the temperature control of the circulating water tank mainly adopted a stable strategy. When the air temperature changed, the method of starting and stopping the water tank fan was synchronously adopted. Through the start and stop of the fan, the stability of the temperature of the supplied circulating water was controlled. For the favorable conditions brought about by the change of air temperature, no energy-saving optimization was carried out. The temperature of the circulating water entering the unit compressor was relatively stable, and the energy consumption optimization of the compressor was not synchronously explored according to the change of air temperature and season.

[0005] Therefore, an optimized water temperature regulation pipeline for an air separation unit is proposed. Content of the Utility Model

[0006] The purpose of the utility model is to provide an optimized water temperature regulation pipeline for an air separation unit, which has the function of optimizing the water temperature regulation of the air separation unit, and solves the problems in the prior art that no energy-saving optimization is carried out for the favorable conditions brought about by the change of air temperature, and the energy consumption optimization of the compressor is not synchronously explored according to the change of air temperature and season.

[0007] In order to achieve the above purpose, the technical scheme adopted by the utility model is that the utility model provides an optimized water temperature regulation pipeline for an air separation unit, including an air compressor, the air compressor is connected to an air compressor cooler, the rear side of the air compressor is connected to an air cooling tower, the top of the air cooling tower is connected to a molecular sieve, the molecular sieve is connected to a fractionating tower, the fractionating tower respectively leads out an oxygen pipeline and a nitrogen pipeline, an oxygen compressor and an oxygen compressor cooler are arranged on the oxygen pipeline, a nitrogen compressor and a nitrogen compressor cooler are arranged on the nitrogen pipeline, the air compressor cooler, the top of the water cooling tower, the oxygen compressor cooler and the nitrogen compressor cooler are connected to each other through a connecting pipeline, and a lead-out pipeline is led out from the connecting pipeline and connected to a circulating water tank.

[0008] Preferably, one side of the top of the air cooling tower is connected to a refrigerator through a freezing water pipe, and the refrigerator is respectively connected to the water cooling tower and the connecting pipeline.

[0009] Preferably, an air filter is connected to the front side of the air compressor.

[0010] Preferably, a circulating water pump is provided on the lead-out pipe at the front end of the circulating water tank.

[0011] Preferably, the air compressor cooler, the bottom of the air cooling tower, the refrigerator, the oxygen compressor cooler, and the nitrogen compressor cooler are all connected to a return water pipe, and the return water pipe is connected to a fan.

[0012] Preferably, the middle part of the air cooling tower is connected to a connecting pipe through a normal temperature water pipe, a normal temperature water pump is provided on the normal temperature water pipe, and a refrigerated water pump is provided on the refrigerated water pipe.

[0013] Preferably, a thermometer T1 is provided on the lead-out pipe, a thermometer T2 is provided at the top of the water cooling tower, a thermometer T3 is provided at the bottom of the water cooling tower, a thermometer T4 is provided on the refrigerated water pipe, and a thermometer T5 is provided at the top of the air cooling tower.

[0014] Compared with the prior art, the advantages and positive effects of the present utility model are as follows:

[0015] 1. The present utility model distinguishes different environments and air temperatures, and adjusts the cooling parts targeted to achieve energy consumption savings. The circulating water cools down from the source, reducing the power consumption of intermediate refrigeration equipment and compressors.

[0016] 2. The present utility model has the function of optimizing the water temperature regulation of the air separation unit, solving the problem that in the prior art, for the favorable conditions brought by the change of air temperature, no energy-saving optimization is carried out, and the energy consumption optimization of the compressor is not synchronously explored according to the change of air temperature and season. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of an optimized water temperature regulation pipeline for an air separation unit;

[0019] In the above figures, 1 is an air filter, 2 is an air compressor, 3 is an air compressor cooler, 4 is an air cooling tower, 5 is a normal temperature water pump, 6 is a chilled water pump, 7 is a chiller, 8 is a water cooling tower, 9 is a molecular sieve, 10 is a fractionating tower, 11 is an oxygen compressor, 12 is an oxygen compressor cooler, 13 is a nitrogen compressor, 14 is a cooler for nitrogen compressor 13, 15 is a fan, 16 is a circulating water tank, and 17 is a circulating water pump. Detailed implementation mode

[0020] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described below in conjunction with the drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0021] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the specific embodiments disclosed in the following specification.

[0022] Embodiment 1, as Figure 1 shown, an optimized water temperature adjustment pipeline for an air separation unit includes an air compressor 2. The air compressor 2 compresses air, increases the gas density and pressure, facilitates subsequent cooling and separation processes, improves the air treatment efficiency, ensures the smooth progress of the gas separation process, and provides a stable gas source for cooling and separation. The air compressor 2 is connected to an air compressor cooler 3, and the air compressor cooler 3 cools the compressed air, reduces its temperature, and improves the gas separation efficiency.

[0023] Behind the air compressor 2 is connected to an air cooling tower 4. The air cooling tower 4 reduces the temperature of the circulating water through the heat exchange between the circulating water and the air. The top of the air cooling tower 4 is connected to a molecular sieve 9. The molecular sieve 9 adsorbs impurities in the air, purifies the gas, and provides pure industrial gas media such as oxygen, nitrogen, and argon. The molecular sieve 9 is connected to a fractionating tower 10. The fractionating tower 10 utilizes the boiling point differences of different gases to improve the gas purity through the rectification process and fractionates pure gases. The fractionating tower 10 respectively leads out an oxygen pipeline and a nitrogen pipeline, and conveys the separated oxygen and nitrogen through the oxygen pipeline and the nitrogen pipeline.

[0024] An oxygen compressor 11 and an oxygen compressor cooler 12 are arranged on the oxygen pipeline, and a nitrogen compressor and a cooler for nitrogen compressor 14 are arranged on the nitrogen pipeline. The oxygen compressor 11 and the nitrogen compressor respectively compress oxygen and nitrogen and are responsible for pressurized transportation. The oxygen compressor cooler 12 and the cooler for nitrogen compressor 14 cool the compressed oxygen and nitrogen, ensure the gas purity and equipment safety, and prevent the influence of high temperature on the gas properties and equipment performance.

[0025] The air compressor cooler 3, the top of the water cooling tower 8, the oxygen compressor cooler 12, and the nitrogen compressor cooler 14 are interconnected through connecting pipes, and an outlet pipe is led out from the connecting pipes and connected to the circulating water tank 16.

[0026] The circulating water in the circulating water tank 16 is led out through the outlet pipe and sent to each component through the connecting pipes, which can supply or receive the circulating water and play the role of supplying the circulating water or water-cooling heat dissipation.

[0027] The specific designs of the above key components are described in detail below:

[0028] One side of the top of the air cooling tower 4 is connected to the refrigerator 7 through a refrigeration water pipe. The refrigerator 7 can effectively reduce the temperature of the circulating water in the refrigeration water pipe. The refrigerator 7 is respectively connected to the water cooling tower 8 and the connecting pipes. The water cooling tower 8 and the connecting pipes supply the circulating water into the refrigerator 7 and send it to the top of the air cooling tower 4 through the refrigeration water pipe.

[0029] An air filter 1 is connected to the front side of the air compressor 2. The air filter 1 filters impurities in the air, protects the air compressor 2 and subsequent equipment, ensures the purity of the incoming air, and extends the service life of the equipment.

[0030] A circulating water pump 17 is arranged on the outlet pipe at the front end of the circulating water tank 16. The circulating water tank 16 is used to store the circulating water, and the circulating water is led out from the circulating water tank 16 through the outlet pipe by the circulating water pump 17 and sent into the connecting pipes.

[0031] The air compressor cooler 3, the bottom of the air cooling tower 4, the refrigerator 7, the oxygen compressor cooler 12, and the nitrogen compressor cooler 14 are all connected to the return water pipe. The return water pipe is connected to the fan 15. The return water pipe receives the high-temperature circulating water after heat exchange, sends it to the fan 15 for air-cooling heat dissipation, and falls back into the circulating water tank 16 through the way of dripping through the packing. The fan 15 is arranged above the circulating water tank 16, and the packing at the end of the return water pipe is arranged above the circulating water tank 16 under the fan 15.

[0032] The middle part of the air cooling tower 4 is connected to the connecting pipes through a normal temperature water pipe. The circulating water in the connecting pipes is sent into the middle part of the air cooling tower 4 through the normal temperature water pipe. A normal temperature water pump 5 is arranged on the normal temperature water pipe. The normal temperature water pump 5 provides power for the transportation of the circulating water in the normal temperature water pipe. A refrigeration water pump 6 is arranged on the refrigeration water pipe. The refrigeration water pump 6 provides power for the transportation of the cooled circulating water in the refrigeration water pipe.

[0033] A thermometer T1 is provided on the extraction pipeline, a thermometer T2 is provided at the top of the water cooling tower 8, a thermometer T3 is provided at the bottom of the water cooling tower 8, a thermometer T4 is provided on the chilled water pipe, and a thermometer T5 is provided at the top of the air cooling tower 4. The thermometer T1 monitors the temperature of the circulating water in the extraction pipeline; the thermometer T2 monitors the temperature of the circulating water at the top of the water cooling tower 8; the thermometer T3 monitors the temperature of the circulating water at the bottom of the water cooling tower 8; the thermometer T4 monitors the temperature of the circulating water in the chilled water pipe; the thermometer T5 monitors the temperature at the top of the air cooling tower 4. Through the thermometers T1 - T5, the temperature can be monitored in real time to ensure operation within the optimal temperature range, providing data support for facilitating the adjustment and optimization of the cooling method.

[0034] Example 2, an optimized water temperature adjustment pipeline for an air separation unit as shown in Example 1, workflow description:

[0035] 1. Cooling of the circulating water.

[0036] The circulating water is pressurized by the circulating water pump 17, enters the connecting pipeline and then is distributed to each component. Inside the cooler, through the heat exchange between water and the gas medium, the high-temperature circulating water is collected from the return water pipeline and returned to the packing above the circulating water tank 16. After the fan 15 is started, the outside air enters from the lower part of the packing and is taken back to the environment by the fan 15. The cooled circulating water falls into the pool for the next cycle.

[0037] 2. Cooling of the precooling system.

[0038] The air cooling tower 4, the water cooling tower 8, the normal temperature water pipe, the chilled water pipe, and the chiller 7 form a precooling system. The normal temperature water pump 5 sends the circulating water (initially measured at 24 - 26 °C by the thermometer T1 and the thermometer T2) to the lower part of the air cooling tower 4 for heat exchange with the high-temperature air first. Secondly, the circulating water enters the top of the water cooling tower 8 and is cooled during the downward flow (measured at 19 - 20 °C by the thermometer T3). After being pressurized by the chilled water pump 6, it enters the chiller 7 for further cooling to form chilled water (measured at 10 - 11 °C by the thermometer T4). After the air and the chilled water exchange heat in the air cooling tower 4, the outlet air temperature (measured at 13 - 14 °C by the thermometer T5) enters the next system. The control standard for the outlet temperature of the air cooling tower 4 is below 17 °C.

[0039] 3. Optimize the cooling method of the circulating water according to the change of air temperature.

[0040] Give full play to the cooling effect of the pool fan 15 and the packing to cool the circulating water from the source.

[0041] (1) Under the rated working conditions of the air separation unit, analyze the corresponding relationship between the weather air temperature and the circulating water temperature through data. Through summary, when the air temperature is below 12 °C, all the fans 15 of the circulating water tank 16 are started, and the circulating water temperature can be controlled within 15 °C. The outlet temperature of the air cooling tower 4 is within the control standard of below 17 °C.

[0042] (2) Specific optimization operations for the circulating water temperature. Start the fans 15 one by one to lower the circulating water temperature. It is reduced from 26°C to 15°C.

[0043] (3) Adjust the operating load of the chiller 7 in the precooling system. The 15°C circulating water continues to cool down in the water cooling tower 8, so that the temperature measured by the thermometer T3 drops to 13°C. At this time, turn off the operation of the chiller 7. Make the temperature at the bottom of the water cooling tower 8 reach the standard of the chilled water.

[0044] (4) Observe the air temperature at the outlet of the air cooling tower 4, which is within the control standard of 17°C.

[0045] (5) Maintain the circulating water flow of the compressor. mainly adjust the temperature of the compressor lubricating oil. After the water temperature drops, gradually close the return water valve of the oil cooler to control the oil temperature within the standard range of 35 to 40°C.

[0046] Effect: Cooling the circulating water with the relatively low-power fans 15 brings two favorable improvements. First, after the circulating water temperature is reduced from above 25°C to below 15°C and then cooled down by the water cooling tower 8, it can directly reach the temperature standard of the chilled water. By shutting down the chiller 7, each oxygen generation unit can save 300 kwh of electricity per hour; second, the isothermal compression efficiency of the compressor is improved, the operating efficiency is improved, and the power consumption is saved.

[0047] The standard parts used in the present utility model can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0048] The above is only a preferred embodiment of the present utility model, and it is not a limitation to the present utility model in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An air separation unit optimized water temperature regulating pipeline, characterized in that: It includes an air compressor, which is connected to an air compressor cooler. The rear side of the air compressor is connected to an air cooling tower. The top of the air cooling tower is connected to a molecular sieve. The molecular sieve is connected to a fractionation tower. The fractionation tower leads out an oxygen pipeline and a nitrogen pipeline respectively. An oxygen compressor and an oxygen compressor cooler are arranged on the oxygen pipeline. A nitrogen compressor and a nitrogen compressor cooler are arranged on the nitrogen pipeline. The air compressor cooler, the top of the water cooling tower, the oxygen compressor cooler and the nitrogen compressor cooler are connected to each other through a connecting pipe. The connecting pipe leads out with a lead-out pipe connected to a circulating water pool.

2. The optimized water temperature regulating pipeline of an air separation unit according to claim 1 is characterized in that: One side of the top of the air cooling tower is connected to a refrigerator through a chilled water pipe, and the refrigerator is respectively connected to the water cooling tower and the connecting pipe.

3. The optimized water temperature regulating pipeline of an air separation unit according to claim 1 is characterized in that: An air filter is connected to the front side of the air compressor.

4. The optimized water temperature regulating pipeline of an air separation unit according to claim 1 is characterized in that: A circulating water pump is arranged on the outlet pipe at the front end of the circulating water pool.

5. The optimized water temperature regulating pipeline of an air separation unit according to claim 2 is characterized in that: The air compressor cooler, the bottom of the air cooling tower, the refrigerator, the oxygen compressor cooler and the nitrogen compressor cooler are connected to the return water pipeline, and the return water pipeline is connected to the fan.

6. The optimized water temperature regulating pipeline of an air separation unit according to claim 2 is characterized in that: The middle part of the air cooling tower is connected to the connecting pipe through a normal temperature water pipe, a normal temperature water pump is arranged on the normal temperature water pipe, and a freezing water pump is arranged on the freezing water pipe.

7. An optimized water temperature regulating pipeline for an air separation unit according to any one of claims 2 to 6, characterized in that: The outlet pipe is provided with a thermometer T1, the top of the water cooling tower is provided with a thermometer T2, the bottom of the water cooling tower is provided with a thermometer T3, the freezing water pipe is provided with a thermometer T4, and the top of the air cooling tower is provided with a thermometer T5.

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