Nitrogen compressor unit

Abstract

The invention discloses a nitrogen compressor unit which comprises a rack, a compressor is arranged on the rack, a gas outlet of the compressor is communicated with an intercooler, and a gas outlet of the intercooler is communicated with a gas storage tank; the intercooler comprises a plurality of horizontal heat exchangers, a cooling liquid inlet of the intercooler is communicated with a first liquid inlet pipe, the first liquid inlet pipe is communicated with a condensing box, a cooling liquid outlet of the intercooler is communicated with a first liquid outlet pipe, and one end, far away from the intercooler, of the first liquid outlet pipe is communicated with an inlet of the condensing box; a cooling cavity is formed in a volute of the compressor, an inlet and an outlet are formed in the cooling cavity, the inlet and the outlet of the cooling cavity communicate with a second liquid inlet pipe and a second liquid outlet pipe correspondingly, and the ends, away from the volute, of the second liquid inlet pipe and the second liquid outlet pipe communicate with an outlet and an inlet of the condensation box correspondingly; and a heat dissipation fan is arranged on the top side of the rack. Heat dissipation of the compressor is facilitated, and storage and transportation are facilitated.

Description

Technical Field

[0001] This invention relates to the field of nitrogen compressor technology, and more specifically, to a nitrogen compressor unit. Background Technology

[0002] Nitrogen is a colorless, odorless, and compressible gas that can withstand high pressure. It is sparingly soluble in water and ethanol, chemically inert, and rarely reacts with other substances at room temperature. Nitrogen constitutes 78.08% (by volume) of the atmosphere, making it a major component of air. It is readily available and inexpensive. Due to its unique chemical properties, nitrogen is frequently used for oxidation and corrosion prevention, gas sealing, purging and unblocking, cooling, and as an environmental stimulant. Nitrogen has a wide range of applications, including in the food, pharmaceutical, animal husbandry, refrigeration, electronics, metal smelting, chemical, machinery manufacturing, synthetic fertilizer, and oilfield extraction industries, all of which require nitrogen, resulting in significant demand.

[0003] Nitrogen gas often needs to be compressed to a high pressure for easy storage, transportation, and use. Increasing the pressure of nitrogen requires the use of a booster compressor unit. However, currently used nitrogen compressor units suffer from poor heat dissipation during operation, and the high temperature of the pressurized nitrogen is detrimental to storage and transportation. Summary of the Invention

[0004] The purpose of this invention is to provide a nitrogen compressor unit. This not only improves compressor heat dissipation but also facilitates storage and transportation.

[0005] The technical solution of this invention is implemented as follows: The present application provides a nitrogen compressor unit, including a frame, on which a compressor is mounted, the gas outlet of the compressor is connected to an intercooler, and the gas outlet of the intercooler is connected to a gas storage tank. The aforementioned intercooler includes multiple horizontal heat exchangers connected in series. The coolant inlet of the intercooler is connected to a first inlet pipe, and the end of the first inlet pipe away from the intercooler is connected to a condenser. The coolant outlet of the intercooler is connected to a first outlet pipe, and the end of the first outlet pipe away from the intercooler is connected to the inlet of the condenser. The compressor casing has a cooling chamber, which has an inlet and an outlet. The inlet and outlet of the cooling chamber are respectively connected to a second liquid inlet pipe and a second liquid outlet pipe. The ends of the second liquid inlet pipe and the second liquid outlet pipe away from the casing are respectively connected to the outlet and inlet of the condenser box. A cooling fan is installed on the top side of the aforementioned rack.

[0006] In some embodiments of the present invention, a lubricating oil system is also included, the lubricating oil system including a lubricating oil tank, the lubricating oil tank being connected to an oil outlet pipe and an oil return pipe, both of which are connected to the shaft seal structure of the compressor.

[0007] In some embodiments of the present invention, a filter is provided at the inlet of the compressor.

[0008] In some embodiments of the present invention, a silencer is provided at the outlet of the compressor.

[0009] In some embodiments of the present invention, the outlet of the intercooler is connected to a main pipe, and the end of the main pipe away from the intercooler is connected to two branch pipes. The main pipe and the two branch pipes are connected by a three-way valve. There are two gas storage tanks, and the two gas storage tanks are respectively connected to the two powder pipelines.

[0010] In some embodiments of the present invention, the number of the above-mentioned cooling fans is two.

[0011] In some embodiments of the present invention, the compressor described above is a six-stage centrifugal compressor.

[0012] Compared with the prior art, the technical solution of the present invention has at least the following advantages or beneficial effects: (1) In this invention, the cooling of compressed nitrogen is achieved by a multi-stage series horizontal heat exchanger, which has the advantage of good cooling effect. Moreover, the nitrogen temperature after cooling is low, which is beneficial to the storage and transportation of nitrogen.

[0013] (2) The condensate in the condenser is cooled by the second liquid inlet pipe, which is beneficial to the cooling of the centrifugal structure of the compressor and realizes the heat dissipation of the compressor; moreover, the coolant that exchanges heat in the volute flows back to the condenser through the second liquid outlet pipe to realize the recycling of coolant.

[0014] (3) The cooling fan can output the heat generated during the operation of the present invention, which is beneficial to the external cooling of the overall structure of the compressor unit. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a nitrogen compressor unit according to an embodiment of the present invention; Figure 2 This is a top view of the arrangement of the compressor and intercooler according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a bedroom heat exchanger connected in series according to an embodiment of the present invention.

[0017] Icons: 1-Lubricating oil tank, 2-Compressor, 3-Frame, 4-Second liquid outlet pipe, 5-Cooling fan, 6-Condenser, 7-First liquid inlet pipe, 8-Silencer, 9-Guide pipe, 10-Shaft seal structure, 11-Horizontal heat exchanger, 12-Three-way valve, 13-Main pipeline, 14-Pressure gauge, 15-Gas storage tank, 16-Oil outlet pipe, 17-Oil return pipe, 18-First liquid outlet pipe, 19-Second liquid inlet pipe. Detailed Implementation Example

[0018] Please refer to Figures 1-3 A nitrogen compressor unit includes a frame 3, which is a rectangular frame structure. A rectangular base plate is provided on the bottom side of the frame 3, and the four sides of the rectangular base plate are connected to the four side walls of the frame 3. A compressor 2 is provided on the frame 3. The gas outlet of the compressor 2 is connected to an intercooler. The gas outlet of the compressor 2 and the intercooler are connected through a guide pipe 9. The gas outlet of the intercooler is connected to a gas storage tank 15. The compressor 2, the intercooler and the gas storage tank 15 are all mounted on the rectangular base plate.

[0019] The nitrogen inlet pipe has a diameter of DN800; the nitrogen extraction pipe has a diameter of DN200; the drive motor of compressor 2 is an asynchronous drive motor, model YKOS5000-2, with an output power of 5000kw and a voltage of 10000V.

[0020] The aforementioned intercooler includes multiple horizontal heat exchangers 11 connected in series. The coolant inlet of the intercooler is connected to a first inlet pipe 7, and the end of the first inlet pipe 7 away from the intercooler is connected to a condenser 6. The coolant outlet of the intercooler is connected to a first outlet pipe 18, and the end of the first outlet pipe 18 away from the intercooler is connected to the inlet of the condenser 6. The cooling of compressed nitrogen is achieved through the multi-stage horizontal heat exchangers 11, which has the advantage of good cooling effect. Moreover, the nitrogen temperature after cooling is relatively low, which is beneficial to the storage and transportation of nitrogen.

[0021] The compressor 2 has a cooling chamber in its volute, which is located inside the side wall of the volute (not shown in the figure). The cooling chamber is arranged circumferentially along the volute to achieve all-round cooling inside the volute. In actual design, the cooling chamber covers the centrifugal impeller as completely as possible for better cooling effect. The cooling chamber has an inlet and an outlet. In actual design, the inlet of the cooling chamber is at the bottom and the outlet is at the top to ensure that the coolant can stay in the cooling chamber and then be discharged from the outlet. The inlet and outlet of the cooling chamber are respectively connected to a second inlet pipe 19 and a second outlet pipe 4. The ends of the second inlet pipe 19 and the second outlet pipe 4 away from the volute are respectively connected to the outlet and inlet of the condenser 6. The condensate in the condenser 6 cools the volute through the second inlet pipe 19, which is beneficial to the cooling of the centrifugal structure of the compressor 2 and realizes the heat dissipation of the compressor 2. Moreover, the coolant that exchanges heat in the volute flows back to the condenser 6 through the second outlet pipe 4 to realize the recycling of coolant.

[0022] A cooling fan 5 is provided on the top side of the frame 3. The cooling fan 5 can output the heat generated during the operation of the present invention, which is beneficial to the external cooling of the overall structure of the compressor 2 unit.

[0023] Each of the first inlet pipe 7, the second inlet pipe 19, the first outlet pipe 18, and the second outlet pipe 4 is equipped with a separate valve for control, which facilitates flow restriction control. Furthermore, each of the first outlet pipe 18 and the second outlet pipe 4 is equipped with a booster pump to provide power for the circulation of coolant.

[0024] In some embodiments of the present invention, a lubricating oil system is also included, which includes a lubricating oil tank 1. The lubricating oil tank 1 is connected to an oil outlet pipe 16 and an oil return pipe 17. Both the oil outlet pipe 16 and the oil return pipe 17 are connected to the shaft seal structure 10 of the compressor 2.

[0025] In the above embodiment, the lubricating oil tank 1 has a power structure, which causes the lubricating oil to enter the shaft seal structure 10 of the compressor 2 through the oil outlet pipe 16, and finally flow back to the lubricating oil tank 1 through the oil return pipe 17. The lubricating oil has the following effects: Reduce friction: Adding lubricating oil to the friction surface can reduce the coefficient of friction, thereby reducing frictional resistance and saving energy consumption.

[0026] Reduce wear: Lubricating oil can reduce wear caused by abrasive wear, surface fatigue, adhesive wear, etc. between friction surfaces.

[0027] Cooling effect: Lubricating oil can absorb, transfer, and dissipate heat, thus reducing the temperature rise caused by frictional heat.

[0028] Rust prevention: The presence of lubricating oil on the friction surface can prevent rust caused by air droplets, water vapor, corrosive gases and liquids, dust, and oxides.

[0029] In the actual design, valves are installed on the oil outlet pipe 16 and the oil return pipe 17 to limit the flow and ensure the lubricating oil flow rate is 700 L / min. Temperature detectors are installed on both the oil outlet pipe 16 and the oil return pipe 17 to ensure that the oil outlet temperature of the oil outlet pipe 16 is between 40-43 degrees Celsius and the oil return temperature of the oil return pipe 17 does not exceed 65 degrees Celsius. A pressure sensor is installed on the oil outlet pipe 16 to ensure that the oil supply pressure is 0.4 MPa. The capacity of the lubricating oil storage chamber is not less than 10 cubic meters.

[0030] In some embodiments of the present invention, a filter is provided at the inlet of the compressor 2.

[0031] In the above embodiments, the filter design can filter out impurities in nitrogen, resulting in higher purity nitrogen after treatment.

[0032] The filter operates at a temperature of 25 degrees Celsius and its flow rate is guaranteed to be 33,000 Nm³ / h (at zero degrees Celsius).

[0033] In some embodiments of the present invention, a silencer is provided at the outlet of the compressor 2.

[0034] In the above embodiment, the silencer 8 has a noise reduction function. The flow rate of the silencer 8 is guaranteed to be 33000 Nm³. 3 / h (zero degree Celsius standard state), the inlet pressure of silencer 8 is not greater than 0.2 MPa, and the operating temperature of silencer 8 is 40 degrees Celsius.

[0035] In some embodiments of the present invention, the outlet of the intercooler is connected to a main pipe 13, and the end of the main pipe 13 away from the intercooler is connected to two branch pipes. The main pipe 13 and the two branch pipes are connected by a three-way valve 12. There are two gas storage tanks 15, and the two gas storage tanks 15 are respectively connected to the two powder pipelines.

[0036] In the above implementation, nitrogen gas is pressurized by compressor 2 and then cooled by intercooler. After being cooled by intercooler, the high-pressure nitrogen gas is discharged through main pipeline 13. After being regulated by three-way valve 12, the high-pressure nitrogen gas fills one of the gas storage tanks 15 first. At this time, the high-pressure nitrogen gas can be continuously filled into another gas storage tank 15 by regulating three-way valve 12 to replace the above-mentioned filled nitrogen storage tank. By repeating the above operation, the high-pressure nitrogen gas can be cyclically filled.

[0037] Both gas storage tanks 15 are equipped with pressure gauges 14, which can be used to detect the pressure in the gas storage tanks 15 so as to facilitate timely replacement of the gas storage tanks 15.

[0038] In some embodiments of the present invention, the number of the above-mentioned cooling fans 5 is two.

[0039] In the above embodiment, two cooling fans 5 are arranged side by side on the top side of the frame 3, and both cooling fans 5 operate simultaneously, giving the invention the advantage of good heat dissipation. Furthermore, both cooling fans 5 can be controlled independently, allowing for the selection of the appropriate cooling fan 5 based on actual usage, thus enhancing practicality.

[0040] In some embodiments of the present invention, the compressor 2 described above is a six-stage centrifugal compressor.

[0041] In the above embodiments, the compressor 2 is a six-stage centrifugal compressor, which has the advantage of good nitrogen compression effect. It should be noted that the six-stage centrifugal compressor 2 is merely one implementation of the present invention and does not limit the structure of the compressor 2. In other embodiments, other structures are also possible, as long as the nitrogen compression function can be achieved.

Claims

1. A nitrogen compressor unit, characterized in that, The system includes a frame, on which a compressor is mounted. The gas outlet of the compressor is connected to an intercooler, and the gas outlet of the intercooler is connected to a gas storage tank. The intercooler includes multiple horizontal heat exchangers connected in series. The coolant inlet of the intercooler is connected to a first inlet pipe, the end of the first inlet pipe away from the intercooler is connected to a condenser, and the coolant outlet of the intercooler is connected to a first outlet pipe, the end of the first outlet pipe away from the intercooler is connected to the inlet of the condenser. The compressor casing has a cooling chamber with an inlet and an outlet. The inlet and outlet of the cooling chamber are respectively connected to a second inlet pipe and a second outlet pipe. The ends of the second inlet pipe and the second outlet pipe away from the casing are respectively connected to the outlet and inlet of the condenser. A cooling fan is mounted on the top side of the frame.

2. A nitrogen compressor unit according to claim 1, characterized in that, It also includes a lubricating oil system, which includes a lubricating oil tank connected to an oil outlet pipe and an oil return pipe, both of which are connected to the shaft seal structure of the compressor.

3. A nitrogen compressor unit according to claim 1, characterized in that, The compressor is equipped with a filter at its inlet.

4. A nitrogen compressor unit according to claim 3, characterized in that, The compressor outlet is equipped with a silencer.

5. A nitrogen compressor unit according to claim 1, characterized in that, The outlet of the intercooler is connected to a main pipeline, and the end of the main pipeline away from the intercooler is connected to two branch pipelines. The main pipeline and the two branch pipelines are connected by a three-way valve. There are two gas storage tanks, and the two gas storage tanks are respectively connected to the two powder pipelines.

6. A nitrogen compressor unit according to claim 1, characterized in that, The number of cooling fans is two.

7. A nitrogen compressor unit according to claim 1, characterized in that, The compressor is a six-stage centrifugal compressor.

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