A reciprocating compressor cylinder oil injection recycling system

Abstract

The application discloses a kind of reciprocating compressor cylinder oil injection recycling system, including waste oil collection tank, high-precision filter, dehydration tank, vacuum pump, delivery pump, purified oil storage tank, purified oil buffer tank and connecting pipeline, control valve, waste oil collection tank is used to collect reciprocating compressor during operation, waste lubricating oil is discharged from cylinder.The high-precision filter filters waste oil in waste oil collection tank to remove the mechanical impurities contained therein.Vacuum pump, dehydration tank are connected by pipeline, so that the dehydration tank is in a high vacuum environment.Delivery pump can send the lubricating oil that has completed purification in dehydration tank to purified oil storage tank.Nitrogen replacement pipeline is provided at the top of purified oil storage tank, and the purified lubricating oil is pressed into purified oil buffer tank by nitrogen.Purified oil buffer tank is connected with the oil tank of compressor injector, and can automatically supplement oil.Through the above design, the collection, purification, recycling use of cylinder oil injection are realized.

Description

Technical Field

[0001] This invention relates to reciprocating compressor units used in chemical production processes, particularly to reciprocating compressor units with different pressures and media that require cylinder lubrication, and especially to a reciprocating compressor cylinder oil recovery and utilization system. Background Technology

[0002] Currently, in chemical and other production sectors, especially in production units that use reciprocating compressors to increase gas pressure, particularly those with large displacement and high exhaust pressure requiring cylinder lubrication, lubrication is used during operation to reduce wear between the piston support rings, sealing rings, and cylinder liners. Operators still need to replenish the oil tank of the lubricator regularly and recover the generated waste oil. Due to the large consumption, multiple replenishments are required daily, leading to high labor intensity for operators. Furthermore, the discharged waste oil is treated as hazardous waste, increasing disposal costs. In recent years, affected by the global business environment and economic situation, businesses have faced relatively difficult operating conditions. Collecting, purifying, and reusing waste oil can effectively reduce production costs, thus creating a strong demand for a reciprocating compressor cylinder oil recovery and recycling system. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a reciprocating compressor cylinder oil injection and recycling system. This invention can automatically recover waste oil generated during the cylinder oil injection process of a reciprocating compressor, purify the recovered waste oil, and then automatically return it to the oil injector for reuse. The entire system is automatically controlled by a PLC, making it simple to operate and safe to run.

[0004] This invention is achieved through the following technical solution: A reciprocating compressor cylinder oil recycling system includes a waste oil collection tank, a high-precision filter, a dehydration tank, a transfer pump, a purified oil storage tank, and a purified oil buffer tank. The inlet of the waste oil collection tank is connected to the waste lubricating oil outlet of the reciprocating compressor cylinder; the outlet of the waste oil collection tank is connected to the inlet of the high-precision filter; the outlet of the high-precision filter is connected to the inlet of the dehydration tank; the outlet of the dehydration tank is connected to the inlet of the transfer pump; the outlet of the transfer pump is connected to the inlet of the purified oil storage tank; the outlet of the purified oil storage tank is connected to the inlet of the purified oil buffer tank; and the outlet of the purified oil buffer tank is connected to the oil tank of the reciprocating compressor's oil injector. A control valve and a pressure reducing valve are sequentially installed on the pipeline between the waste lubricating oil outlet of the reciprocating compressor cylinder and the waste oil collection tank. A vacuum pump is connected to the top of the dehydration tank, and a nitrogen replacement pipeline is connected to the top of the purified oil storage tank.

[0005] Multiple interfaces of different pressure levels are provided between the cylinder waste lubricating oil outlet of the reciprocating compressor and the waste oil collection tank. Each interface is connected in series with the first control valve and the pressure reducing valve. The outlet pressure of the pressure reducing valve is less than 0.5 MPa. The outlets of the multiple pressure reducing valves are connected to the inlet pipe of the waste oil collection tank. The inlet pipe of the waste oil collection tank is also connected to the nitrogen replacement pipe. The nitrogen replacement pipe is equipped with the second control valve and the first check valve. A pressure gauge and a safety valve are also installed on the inlet pipe of the waste oil collection tank. The outlet of the safety valve and the outlet of the vacuum pump are combined and connected to the vent pipe.

[0006] The high-precision filter is a dual-filter structure with one filter in use and one on standby. Differential pressure gauges are installed on its inlet and outlet pipes, and the differential pressure monitoring threshold of the differential pressure gauges is 0.25 MPa.

[0007] A heater is installed in the lower middle part of the dehydration tank. A thermometer and a level gauge are installed on the tank body. A heater is installed on the feed pipe of the dehydration tank. A downward-spraying atomizer is installed on the feed pipe inside the dehydration tank. A metal wire mesh demister is installed in the upper middle part of the inside of the dehydration tank. The operating temperature of the heater is controlled at 65-75℃, and the operating temperature of the heater is controlled at 100℃. The level gauge controls the liquid level in the dehydration tank to be maintained at 60-80%. The operating frequency of the vacuum pump is linked to the pressure inside the dehydration tank to keep the pressure inside the dehydration tank below 0.01MPaA.

[0008] The inlet and outlet of the pump are equipped with control valve three, and the outlet of the pump is also equipped with check valve two.

[0009] The purified oil storage tank is equipped with a level gauge II, which controls the liquid level in the purified oil storage tank to be maintained at 20-80%; the nitrogen replacement pipeline inputs nitrogen into the purified oil storage tank to maintain the pressure in the tank at 0.1-0.3MPa; and the oil outlet pipeline at the bottom of the purified oil storage tank is equipped with a control valve IV.

[0010] The purified oil buffer tank is equipped with a level gauge, and the diameter of the pipe connected to the oil tank of the reciprocating compressor oiler at its bottom is adjustable. The top of the purified oil buffer tank is equipped with a filling port, and a breather cap is installed on the filling port.

[0011] The volume of the waste oil collection tank is three times the daily oil injection volume of the reciprocating compressor, and the volumes of the dehydration tank and the purified oil storage tank are the same as those of the waste oil collection tank.

[0012] The high-precision filter is a bag filter with an absolute filtration accuracy of 1μm.

[0013] It also includes a PLC control system, which controls the operation of the recycling system.

[0014] This invention utilizes a closed-loop process—automatic waste oil collection, precision filtration for impurity removal, vacuum heating for dehydration, purified oil storage, and buffer oil replenishment—to achieve the recovery, purification, and reuse of waste lubricating oil from reciprocating compressor cylinders. The entire process is automated via a PLC control system, which can also be switched to manual control as needed. The system employs multi-stage processes to remove mechanical impurities, moisture, and other contaminants from the waste oil, restoring its performance. Simultaneously, the system's safe and stable operation is ensured through the coordinated control of pressure, liquid level, and temperature. Finally, the purified lubricating oil is delivered to the compressor's oiler tank to replace new oil for lubrication, thus achieving the recycling of lubricating oil.

[0015] Waste oil collection: Waste lubricating oil generated by the compressor cylinder is discharged through dedicated interfaces of different pressure levels. Each interface is successively depressurized by control valve 1 and pressure reducing valve (outlet pressure < 0.5MPa) before flowing into the inlet pipeline of the waste oil collection tank. The pressure reducing valve ensures that the system is in a low-pressure safe environment. The inlet pipeline of the waste oil collection tank is equipped with a pressure gauge and a safety valve to realize pressure monitoring and overpressure protection. At the same time, nitrogen replacement pipeline can introduce nitrogen into the inlet pipeline to meet the requirements of maintenance isolation and prevention of cross-contamination.

[0016] Precision filtration: Waste oil in the waste oil collection tank is transported to a high-precision filter. This filter is a dual-bag filter structure with one bag in use and one in standby (filtration accuracy is absolutely 1μm), which can efficiently remove mechanical impurities from the waste oil. Differential pressure gauges are installed at the inlet and outlet of the filter. When the differential pressure reaches 0.25MPa, it automatically switches to the standby filter and simultaneously alarms to prompt the replacement of the filter element, ensuring the continuous operation of the filtration process.

[0017] Vacuum heating dehydration: Before entering the dehydration tank, the filtered waste oil is heated to 100℃ by a heater installed on the pipeline, which improves the atomization effect upon entering the dehydration tank, allowing for the instant removal of water and low-boiling-point substances. The wire mesh demister in the upper middle part intercepts the entrained lubricating oil. Through its micro-curved surface design, the intercepted lubricating oil flows through the tank wall to the bottom. The heater in the lower middle part of the tank controls the oil temperature at 65-75℃. Combined with the high vacuum environment (tank pressure ≤0.01MPaA) created by the top vacuum pump, the water in the waste oil is rapidly vaporized and removed. The dehydration tank is equipped with a level gauge and a thermometer. The liquid level is automatically maintained at 60-80%. The temperature is controlled by a PLC to start and stop the heater (starting at <65℃, stopping at >75℃). The vacuum pump operating frequency is linked to the tank pressure to ensure stable dehydration effect.

[0018] Purified oil transportation and storage: The dehydrated purified lubricating oil is transported to the purified oil storage tank by a transfer pump. The inlet and outlet of the transfer pump are equipped with control valve three to realize automatic start and stop, and outlet check valve two to prevent lubricating oil backflow. Nitrogen gas is introduced into the top of the purified oil storage tank for displacement and pressure maintenance. The pressure inside the tank is maintained at 0.1-0.2MPa. Liquid level gauge two controls the liquid level in the tank at 20-80%. The nitrogen pressure can push the purified oil in the tank to the subsequent process, realizing the energy-saving effect of pump-free transportation.

[0019] Buffer oil replenishment: Purified oil in the purified oil storage tank is intermittently pumped into the purified oil buffer tank through four control valves. The buffer tank is equipped with a level gauge for real-time monitoring of the liquid level. The top oil filler is equipped with a breather cap, which can replenish new oil when lubricating oil is lost and maintain the normal pressure inside the tank. The diameter of the connecting pipe between the bottom of the buffer tank and the oil tank of the compressor oiler can be adjusted as needed. Purified oil is automatically transported to the oil tank of the oiler through this pipe to complete the circulation and replenishment of lubricating oil, forming a closed-loop recycling system.

[0020] In addition, in this invention, the outlet of the safety valve and the outlet of the vacuum pump are connected to the venting pipe to achieve unified venting of the overpressure medium and the exhaust gas from the vacuum pump; the volume of the waste oil collection tank, the dehydration tank, and the purified oil storage tank are all three times the daily oil injection volume of the compressor, ensuring the buffer capacity for continuous operation of the system.

[0021] The advantages of this invention are as follows: This invention mainly comprises a waste oil collection tank, a high-precision filter, a dehydration tank, a vacuum pump, a delivery pump, a purified oil storage tank, a purified oil buffer tank, connecting pipes, control valves, and other equipment, realizing the collection, purification, and recycling of oil injected into the cylinders of a reciprocating compressor. This invention can be configured with one or more interfaces of different pressure levels according to user needs, and the separate discharge and collection of waste oil is achieved through automatic control logic controlling the opening and closing of the valves. This invention is designed for fully automated control, but can also be adjusted for manual operation according to user requirements, minimizing system costs while achieving cylinder oil recycling, purification, and reuse. Furthermore, this invention allows for the design and manufacture of related storage tanks, pipes, and valves using carbon steel or stainless steel according to user needs, controlling procurement costs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0023] like Figure 1As shown, a reciprocating compressor cylinder oil recycling system includes a waste oil collection tank 5, a high-precision filter 7, a dehydration tank 9, a vacuum pump 13, a transfer pump 14, a purified oil storage tank 15, a purified oil buffer tank 17, and connecting pipes and a control valve 1. The waste oil collection tank 5 is used to collect waste lubricating oil discharged from the cylinder during the operation of the reciprocating compressor. The high-precision filter 7 filters the waste oil in the waste oil collection tank to remove mechanical impurities. The vacuum pump 13 and the dehydration tank 9 are connected by pipes, allowing the dehydration tank 9 to be in a high-vacuum environment. The transfer pump 14 delivers the purified lubricating oil in the dehydration tank 9 to the purified oil storage tank 15. The purified oil storage tank 15 is equipped with a nitrogen replacement pipe at the top, using nitrogen to pressurize the purified lubricating oil into the purified oil buffer tank 17. The purified oil buffer tank 17 is connected to the compressor's oil injector 18 oil tank, enabling automatic oil replenishment. Through the above design, the collection, purification, and recycling of cylinder oil are realized, forming a reciprocating compressor cylinder oil recycling system.

[0024] A pressure gauge 3 is installed on the inlet pipe of the waste oil collection tank 5 to monitor the pressure entering the waste oil collection tank 5. At the same time, a safety valve 4 is installed after the pressure gauge to effectively prevent the system from overpressure.

[0025] Multiple interfaces with different pressure levels can be installed on the inlet pipe of the waste oil collection tank 5 according to user needs, and automatic discharge is achieved through control valve 1. To ensure safety, only one control valve 1 can be opened for discharge at a time via PLC control, and the opening time and duration of control valve 1 can be set. A pressure reducing valve 2 is installed downstream of control valve 1 to ensure that the pressure downstream of pressure reducing valve 2 is less than 0.5 MPa, and the entire system is in a low-pressure environment.

[0026] A nitrogen purging pipeline 21 is installed on the pipeline to ensure maintenance safety, and isolation and prevention of material cross-contamination are achieved through control valve 2 6 and check valve 1 25.

[0027] The high-precision filter 7 is designed with one filter in use and one filter on standby. The inlet and outlet pipes are equipped with differential pressure gauges 8. When the differential pressure is greater than 0.25MPa, the filter will automatically switch and an alarm will be triggered to prompt the replacement of the filter element.

[0028] A heater 12 is installed in the lower part of the dehydration tank 9 to control the internal temperature at 65-75℃. A level gauge 10 is installed on the tank body to automatically control the opening and closing of the valves, so as to achieve a liquid level of 60-80%.

[0029] A vacuum pump 13 is installed on the top of the dehydration tank 9, and the pressure inside the dehydration tank 9 is controlled to be below 0.01 MPa by the operating frequency of the vacuum pump 13.

[0030] The feed pipe of the dehydration tank 9 is equipped with a heater 27, which can use steam or electricity to heat the waste lubricating oil and control the temperature at 100℃.

[0031] The feed pipe inside the dehydration tank 9 is equipped with a downward-spraying atomizer, which can instantly atomize the waste lubricating oil, thereby better removing water and other low-boiling-point hydrocarbons.

[0032] The upper middle part of the dehydration tank 9 is equipped with a metal wire mesh demister, which can intercept the entrained lubricating oil and allow it to flow through the tank wall to the bottom of the tank, thereby improving the recovery rate.

[0033] The outlet of the vacuum pump 13 is connected to the outlet of the safety valve 4, and can be connected to the vent pipe 22.

[0034] The inlet and outlet of the pump 14 are equipped with control valves 23 for automatic control, and a check valve 26 is installed at the outlet to prevent backflow of lubricating oil.

[0035] The purified oil storage tank 15 is equipped with a level gauge 16, which can automatically control the opening and closing of the inlet and outlet control valves to achieve a liquid level of 20-80%.

[0036] A nitrogen replacement pipe 21 is installed at the top of the purified oil storage tank 15. Nitrogen is used to maintain the pressure inside the tank at 0.1-0.3MPa. The purified lubricating oil can be intermittently injected into the purified oil buffer tank 17 through the control valve 24 on the bottom pipe.

[0037] The purified oil buffer tank 17 is equipped with a level gauge 319 for easy observation of the internal liquid level.

[0038] The diameter of the pipe connecting the bottom of the purified oil buffer tank 17 to the oil injector tank 18 can be adjusted according to user needs.

[0039] A filler port 20 is provided on the top of the purified oil buffer tank 17 and a breather cap is installed. This design takes into account the loss of cylinder oil during compressor operation, making it easy to add new oil while maintaining the tank at normal pressure.

[0040] All the control valves mentioned are designed as pneumatic switching valves, which facilitates PLC automatic control.

[0041] This invention is designed to automatically recycle waste oil generated during cylinder oil injection in reciprocating compressors, based on the actual needs of users. The oil is purified and then recycled, making it highly targeted.

[0042] The waste oil collection tank 5 can be designed and manufactured using carbon steel or stainless steel according to user needs. The volume of the tank is designed according to the daily oil injection volume, generally three times the daily oil injection volume, to improve the stability of the device operation.

[0043] The high-precision filter 7 mentioned above is generally a bag filter, using filter bags with an absolute precision of 1μm, which has a low procurement cost and is easy to replace.

[0044] The dehydration tank 9 is made of the same material and has the same volume as the waste oil collection tank 5. The lower heater 12 is generally an electric heater, but can be designed as a steam heater in special cases. A thermometer 11 is located in the middle section, and the start and stop of the heater 1 are controlled by a PLC. It starts when the temperature is below 65℃ and stops when it is above 75℃, achieving automatic control. During operation, the thermometer probe must be below the liquid level. A second heater 27 is installed on the feed pipe, using steam heating. A local thermometer is installed on-site, and the temperature of the waste lubricating oil is controlled to 100℃ by adjusting the steam flow rate.

[0045] The purified oil storage tank 15 is made of the same material and has the same volume as the dehydration tank 9. The transfer pump 14 sends the lubricating oil of the purified oil into the upper part of the purified oil storage tank 15. The top is connected to a nitrogen replacement pipe 21, and the nitrogen pressure of 0.1-0.3MPa can meet the operation of the system.

[0046] A level gauge is installed on the purified oil storage tank 15, which can automatically control the opening and closing of the inlet and outlet control valves to maintain the liquid level between 20% and 80%. The purified lubricating oil in the tank is pressurized into the purified oil buffer tank 17 by nitrogen gas.

[0047] The pipes and equipment of this invention use flange connections for easy maintenance. The valves are pneumatically operated to meet automated control requirements.

[0048] This invention is designed for fully automated control, achieving automatic liquid level control by controlling the inlet and outlet control valves of each storage tank. It can also be modified to be manually controlled by operators according to user needs, reducing procurement costs.

[0049] This invention primarily addresses the recovery, purification, and utilization of oil in the cylinders of reciprocating compressors. It can be comprehensively designed to suit different user characteristics, ensuring normal operation for each user while reducing both lubricant consumption and operator workload.

[0050] Example: This embodiment designs a cylinder oil recovery and utilization system for a reciprocating hydrogen compressor with an exhaust pressure of 1.6 MPa and a daily oil injection capacity of 50 L in chemical production. The system adopts PLC fully automatic control. The equipment material is selected as carbon steel based on the characteristics of the medium (hydrogen is non-corrosive). All valves are pneumatic on / off valves. The gas source pressure is 0.4 MPa. The specific configuration and operating parameters are as follows: (I) Configuration of core system equipment Waste oil collection tank: made of carbon steel, with a volume of 150L (daily oil filling capacity of 50L×3). The inlet pipeline has 3 interfaces with different pressure levels (adapted to the waste oil outlets of different cylinders of the compressor). Each interface is equipped with a DN20 pneumatic control valve and a DN20 piston-type pressure reducing valve (outlet pressure adjusted to 0.3MPa). The inlet pipeline is equipped with a 0-1MPa pressure gauge, a DN20 spring-loaded safety valve (set pressure 0.6MPa), and is connected to a DN15 nitrogen replacement pipeline (equipped with a DN15 pneumatic control valve and a DN15 check valve).

[0051] High-precision filter: made of carbon steel, with a dual-bag structure (one for use and one for backup), a single unit filtration area of ​​0.5㎡, and a filter bag precision of 1μm; the inlet and outlet pipes are equipped with DN32 flange connections and a 0-0.6MPa differential pressure gauge (threshold 0.25MPa) to achieve automatic switching and alarm when the filter element is clogged.

[0052] Dehydration tank: made of carbon steel, with a volume of 150L. A 15kW electric heater is installed in the middle and lower part (suitable for scenarios without steam heat source). The tank is equipped with a 0-100℃ temperature gauge and a magnetic float level gauge (to control the liquid level at 60-80%). A rotary vane vacuum pump (pumping speed 2L / s) is connected to the top. The operating frequency of the vacuum pump is linked to the pressure inside the tank to maintain the pressure inside the tank ≤0.01MPaA.

[0053] Transfer pump: A gear pump is selected with a flow rate of 50L / min and a head of 20m. It is equipped with three DN25 pneumatic control valves at the inlet and outlet, and two DN25 check valves at the outlet to ensure one-way delivery of lubricating oil to the purified oil storage tank.

[0054] Purified oil storage tank: made of carbon steel, with a volume of 150L, ​​equipped with two magnetic level gauges (controlling the liquid level from 20-80%), and connected to a DN15 nitrogen replacement pipeline at the top. The pressure inside the tank is maintained at 0.15MPa (nitrogen source pressure 0.25MPa, adjusted by a pressure reducing valve); the bottom oil outlet pipeline is equipped with a DN25 pneumatic control valve to achieve intermittent oil supply to the buffer tank.

[0055] Purified oil buffer tank: made of carbon steel, with a volume of 100L (adapted to the oil replenishment rate of the oil injector tank), equipped with three glass tube level gauges, a DN50 oil filling port at the top and a DN50 flame-arresting breather cap, and a DN20 throttle valve for connecting the bottom pipe to the oil injector tank, the diameter of which can be adjusted as needed (adjusted to 10mm in this embodiment).

[0056] PLC Control System: Adopts Siemens S7-200SMART PLC with a touch screen to realize the linkage control and real-time display of valve start / stop, pump and vacuum pump frequency, heater temperature, and liquid level / pressure of each storage tank. It is equipped with audible and visual alarm functions for overpressure, over-level, and filter blockage.

[0057] (II) System Operation Flow Waste oil collection stage: When the compressor is running, the PLC sequentially opens the pneumatic control valve 1 of the waste oil outlet of each cylinder according to the preset program (only 1 valve is opened at a time, and the single valve opening time is 30 minutes). The waste oil is reduced to 0.3MPa by the pressure reducing valve and then flows into the inlet pipe of the waste oil collection tank. The pressure gauge monitors the pipe pressure in real time. When the pressure exceeds 0.6MPa, the safety valve automatically opens to release pressure, and the pressure-relieving medium is discharged into the waste oil collection system of the plant through the vent pipe.

[0058] Precision filtration stage: When the waste oil collection tank reaches 70%, the PLC automatically opens the bottom outlet valve of the tank, and the waste oil flows by gravity into the high-precision filter (working filter). After being filtered through a 1μm filter bag, metal shavings, impurities, etc. are removed. When the pressure difference between the inlet and outlet of the filter reaches 0.25MPa, the PLC automatically closes the inlet and outlet valves of the working filter and opens the standby filter. At the same time, a filter element replacement alarm pops up on the touch screen, and the operator replaces the filter bag of the working filter in time.

[0059] Vacuum heating dehydration stage: Before entering the dehydration tank, the filtered waste oil is heated to 100℃ by a second heater installed on the pipeline. When the liquid level in the tank reaches 60%, the PLC automatically starts the first electric heater to raise the oil temperature to 70℃ and maintain a constant temperature. Simultaneously, the vacuum pump is started to draw the pressure in the tank to 0.008MPaA and maintain it. The water in the waste oil rapidly vaporizes under high temperature and high vacuum, and is discharged through the vacuum pump exhaust port into the vent pipe. A wire mesh demister installed in the upper middle section intercepts any entrained lubricating oil. Through its micro-curved surface design, the intercepted lubricating oil flows through the tank wall to the bottom of the tank. When the liquid level in the dehydration tank is above 80%, the PLC automatically closes the inlet valve; when it is below 60%, the inlet valve opens to ensure stable dehydration process.

[0060] Purified oil delivery and storage stage: When the liquid level in the dehydration tank reaches 75%, the PLC automatically starts the delivery pump and opens the inlet and outlet control valve three to deliver the dehydrated purified oil to the purified oil storage tank. The one-way valve two at the outlet of the delivery pump effectively prevents the purified oil from flowing back. When the liquid level in the purified oil storage tank reaches 80%, the PLC automatically stops the delivery pump and closes the control valve three. When the liquid level is below 20%, the delivery pump is restarted. The nitrogen replacement pipeline continuously supplies nitrogen into the storage tank to maintain the tank pressure at 0.15MPa, ensuring the power for subsequent oil delivery.

[0061] Buffer oil replenishment stage: When the purified oil buffer tank level is below 30%, the PLC automatically opens the fourth pneumatic control valve at the bottom of the purified oil storage tank. Under nitrogen pressure, the purified oil is forced into the buffer tank through the pipeline. When the buffer tank level reaches 70%, the control valve is closed. The purified oil in the buffer tank automatically flows by gravity to the compressor oiler tank through the DN20 throttle valve. When the oiler tank level reaches the upper limit, the float valve on the tank automatically closes, stopping oil replenishment and realizing automated oil replenishment. When the system lubricating oil level in the buffer tank remains low due to loss, the operator can add new oil through the top filler port. The breather cap ensures that the tank is open to the atmosphere, preventing pressure buildup or collapse.

[0062] (III) System Operation Performance This embodiment, when used with the reciprocating hydrogen compressor, achieves 100% recovery of waste lubricating oil from the cylinder. The purified lubricating oil meets all the lubrication requirements of the compressor cylinder, reducing the daily oil replenishment of the compressor from 50L to below 5L, significantly lowering lubricating oil procurement costs. Simultaneously, it eliminates the need for frequent manual refilling of the oiler tank and manual collection of waste oil, significantly reducing the labor intensity of operators. Waste oil is no longer treated as hazardous waste, completely eliminating hazardous waste disposal costs. The annual comprehensive cost savings per compressor exceed 100,000 yuan. The system operates fully automatically, with all pressure, liquid level, and temperature parameters precisely controlled by the PLC. No safety accidents occurred during operation, demonstrating good stability and reliability, making it suitable for the continuous operation requirements of chemical production.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A reciprocating compressor cylinder oil recovery and utilization system, characterized in that: The system includes a waste oil collection tank, a high-precision filter, a dehydration tank, a transfer pump, a purified oil storage tank, and a purified oil buffer tank. The inlet of the waste oil collection tank is connected to the waste lubricating oil outlet of the reciprocating compressor cylinder. The outlet of the waste oil collection tank is connected to the inlet of the high-precision filter. The outlet of the high-precision filter is connected to the inlet of the dehydration tank. The outlet of the dehydration tank is connected to the inlet of the transfer pump. The outlet of the transfer pump is connected to the inlet of the purified oil storage tank. The outlet of the purified oil storage tank is connected to the inlet of the purified oil buffer tank. The outlet of the purified oil buffer tank is connected to the oil tank of the reciprocating compressor's oiler. A control valve and a pressure reducing valve are sequentially installed on the pipeline between the waste lubricating oil outlet of the reciprocating compressor cylinder and the waste oil collection tank. A vacuum pump is connected to the top of the dehydration tank, and a nitrogen replacement pipeline is connected to the top of the purified oil storage tank.

2. The reciprocating compressor cylinder oil recovery and utilization system according to claim 1, characterized in that: Multiple interfaces of different pressure levels are provided between the cylinder waste lubricating oil outlet of the reciprocating compressor and the waste oil collection tank. Each interface is connected in series with the first control valve and the pressure reducing valve. The outlet pressure of the pressure reducing valve is less than 0.5 MPa. The outlets of the multiple pressure reducing valves are connected to the inlet pipe of the waste oil collection tank. The inlet pipe of the waste oil collection tank is also connected to the nitrogen replacement pipe. The nitrogen replacement pipe is equipped with the second control valve and the first check valve. A pressure gauge and a safety valve are also installed on the inlet pipe of the waste oil collection tank. The outlet of the safety valve and the outlet of the vacuum pump are combined and connected to the vent pipe.

3. The reciprocating compressor cylinder oil recovery and utilization system according to claim 1, characterized in that: The high-precision filter is a dual-filter structure with one filter in use and one on standby. Differential pressure gauges are installed on its inlet and outlet pipes, and the differential pressure monitoring threshold of the differential pressure gauges is 0.25 MPa.

4. The reciprocating compressor cylinder oil recovery and utilization system according to claim 1, characterized in that: A heater is installed in the lower middle part of the dehydration tank. A thermometer and a level gauge are installed on the tank body. A heater is installed on the feed pipe of the dehydration tank. A downward-spraying atomizer is installed on the feed pipe inside the dehydration tank. A metal wire mesh demister is installed in the upper middle part of the inside of the dehydration tank. The operating temperature of the heater is controlled at 65-75℃, and the operating temperature of the heater is controlled at 100℃. The level gauge controls the liquid level in the dehydration tank to be maintained at 60-80%. The operating frequency of the vacuum pump is linked to the pressure inside the dehydration tank to keep the pressure inside the dehydration tank below 0.01MPaA.

5. The reciprocating compressor cylinder oil recovery and utilization system according to claim 1, characterized in that: The inlet and outlet of the pump are equipped with control valve three, and the outlet of the pump is also equipped with check valve two.

6. The reciprocating compressor cylinder oil recovery and utilization system according to claim 1, characterized in that, The purified oil storage tank is equipped with a level gauge II, which controls the liquid level in the purified oil storage tank to be maintained at 20-80%; the nitrogen replacement pipeline inputs nitrogen into the purified oil storage tank to maintain the pressure in the tank at 0.1-0.3MPa; and the oil outlet pipeline at the bottom of the purified oil storage tank is equipped with a control valve IV.

7. The reciprocating compressor cylinder oil recovery and utilization system according to claim 1, characterized in that: The purified oil buffer tank is equipped with a level gauge, and the diameter of the pipe connected to the oil tank of the reciprocating compressor oiler at its bottom is adjustable. The top of the purified oil buffer tank is equipped with a filling port, and a breather cap is installed on the filling port.

8. The reciprocating compressor cylinder oil recovery and utilization system according to claim 1, characterized in that: The volume of the waste oil collection tank is three times the daily oil injection volume of the reciprocating compressor, and the volumes of the dehydration tank and the purified oil storage tank are the same as those of the waste oil collection tank.

9. The reciprocating compressor cylinder oil recovery and utilization system according to claim 1, characterized in that: The high-precision filter is a bag filter with an absolute filtration accuracy of 1μm.

10. A reciprocating compressor cylinder oil recovery and utilization system according to claim 1, characterized in that: It also includes a PLC control system, which controls the operation of the recycling system.

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