CN205225742U - Helical -lobe compressor system with organic rankine cycle - Google Patents

Abstract

The utility model provides a screw compressor system with an organic Rankine cycle, which can solve the problem of low reuse rate caused by direct outward discharge of the existing screw compressor system. It includes the main engine of the screw compressor and the motor that drives the main body of the screw compressor, the screw expander and the working medium steam generation system. The output shaft of the screw expander is connected to the rotor shaft of the screw compressor main engine. , working medium tank, working medium pump, heat exchanger, the heat energy output end of the screw compressor host is connected to the heat exchanger through pipelines, the low-temperature and low-pressure medium output end of the screw expander is connected to the condenser medium inlet end through pipelines, The medium outlet end of the condenser is connected to the working medium tank through pipelines, and the working medium tank, working medium pump, and heat exchanger are connected through pipelines in turn, and the high-temperature and high-pressure medium output end of the heat exchanger is connected to the screw expander through pipelines. The high temperature and high pressure medium input end connection.

Description

A screw compressor system with organic rankine cycle

technical field

The utility model relates to the technical field of screw compressors, in particular to a screw compressor system with an organic Rankine cycle.

Background technique

The screw compressor is a common positive displacement compressor, and its working process follows the laws of thermodynamics. Because the temperature difference between the inlet and outlet gas is not large, it is generally believed that the input power of the screw compressor is converted into heat energy and discharged. Generally, this part The heat energy is directly discharged after being cooled by the heat exchange system. The heat exchange system generally uses fan cooling or water cooling, which has the problem of low heat energy reuse rate and cannot meet the current energy saving and emission reduction requirements.

The existing Organic Rankine Cycle (Organic Rankine Cycle, which can be abbreviated as ORC) is mostly used in power generation systems, and the general Organic Rankine Cycle heat exchanger does not contain a superheater, or does not have a superheater installed independently.

Contents of the invention

In view of the above problems, the utility model provides a screw compressor system with an organic Rankine cycle, which can solve the problem of low energy utilization rate caused by the direct discharge of excess heat energy in the existing screw compressor system, so as to meet the current energy-saving emission reduction requirements.

A screw compressor system with an organic Rankine cycle, which includes a screw compressor main body and a motor that drives the screw compressor main body to work, is characterized in that it also includes a screw expander and a working medium steam generation system, the The output shaft of the screw expander is connected to the rotor shaft of the screw compressor main engine, and the working medium steam generation system includes a condenser, a working medium tank, a working medium pump, and a heat exchanger. The heat energy output of the screw compressor main engine end is connected to the heat exchanger through pipelines, the low-temperature and low-pressure medium output end of the screw expander is connected to the medium inlet end of the condenser through pipelines, and the medium outlet end of the condenser is connected to the working medium through pipelines. Tank connection, the working medium tank, working medium pump, and heat exchanger are connected through pipelines in sequence, and the high-temperature and high-pressure medium output end of the heat exchanger is connected with the high-temperature and high-pressure medium input end of the screw expander through the pipeline connect.

Further, the heat exchanger includes a preheater, an evaporator and a superheater connected in sequence, the working fluid pump is connected to the working fluid input end of the preheater, and the working fluid output end of the superheater passes through The pipeline is connected with the high temperature and high pressure working fluid input end of the screw expander.

Further, a filter is installed on the pipeline connecting the working medium pump and the working medium tank, and a dryer, a pressure sensor and a temperature sensor are installed on the pipeline connecting the working medium pump and the preheater.

Further, on the pipeline connecting the low-temperature and low-pressure medium output end of the screw expander and the condenser, on the pipeline connecting the high-temperature and high-pressure working medium output end of the superheater and the high-temperature and high-pressure working medium input end of the screw expander Both are respectively provided with a pressure sensor and a temperature sensor.

Further, the output shaft of the screw expander is axially connected with the motor rotor shaft.

Further, the host of the screw compressor is an oil-injected screw compressor, and the heat energy output end of the oil-injected screw compressor is a high-temperature mixed oil-gas output end, and the high-temperature mixed oil-gas output end is connected to the oil-gas separator through a one-way valve , the oil-gas separator separates the mixed oil and gas, the gas outlet of the oil-gas separator is connected to a minimum pressure valve, and the minimum pressure valve is connected to the gas inlet of the preheater through a pipeline, and the preheater The gas outlet of the gas separator is connected to the water separator through a pipeline, the lubricating oil outlet of the oil-gas separator is connected to the superheater through a pipeline, and the lubricating oil outlet of the preheater is connected to the oil-injected screw compressor through a pipeline. The lubricating oil return port of the lubricating oil is connected, and the pipeline connecting the preheater lubricating oil outlet and the lubricating oil return port of the oil injection screw compressor mechanism is provided with a lubricating oil flow regulating valve and a lubricating oil filter in sequence along the lubricating oil flow direction .

Further, the main engine of the screw compressor is an oil-free screw compressor, the heat energy output end of the oil-free screw compressor is a high-temperature gas output end, and the high-temperature gas output end is connected to the superheater through a pipeline, and the The gas outlet of the preheater is connected to the water separator through a pipeline, and the high-temperature gas discharged from the high-temperature gas output end passes through the pipeline in turn through the superheater, evaporator, and preheater for heat exchange, and then is discharged from the preheater. The gas outlet is discharged, and then discharged after being separated by a water separator.

Further, the lubricating oil output end of the gear box of the oil-free screw compressor is connected to an oil pump, and the oil pump is connected to the lubricating oil inlet end of the preheater through a pipeline, and the lubricating oil outlet end of the preheater is passed through The pipeline is connected to a lubricating oil filter, and the lubricating oil filter is connected to a lubricating oil return end of the gear box through a return pipeline.

The beneficial effect of the screw compressor of the utility model is that it forms an organic Rankine cycle through the screw expander, heat exchanger, working medium pump and condenser, wherein the working medium composed of heat exchanger, working medium pump and condenser The steam generation system absorbs the heat energy output by the screw compressor, and the organic working medium after being heated and evaporated drives the screw expander to output mechanical energy to the screw compressor or the motor driving the screw compressor, assisting the operation of the screw compressor or the motor driving the screw compressor , can reduce the operating power of the screw compressor or the motor to achieve the effect of energy saving and emission reduction, so it can effectively recycle the heat energy output by the screw compressor to meet the current energy saving and emission reduction requirements.

Description of drawings

Fig. 1 is a schematic diagram of a single-stage oil-injected screw compressor system with an organic Rankine cycle of the present utility model;

Fig. 2 is a schematic diagram of a two-stage oil-injected screw compressor system with an organic Rankine cycle of the present invention;

Fig. 3 is a schematic diagram of a single-stage oil-free screw compressor system with an organic Rankine cycle of the present invention;

Fig. 4 is a schematic diagram of a two-stage oil-free screw compressor system with an organic Rankine cycle of the present invention.

detailed description

Embodiment one:

A single-stage oil-injected screw compressor system with an organic Rankine cycle, as shown in Figure 1, which includes a single-stage oil-injected screw compressor host 1-1, and a motor 2 that drives the single-stage oil-injected screw compressor host 1-1 , the screw expander 5 and the working medium steam generation system 6, the air inlet port of the main engine 1-1 of the single-stage oil-injected screw compressor is connected to the air intake valve 3 and the air intake filter 4 in sequence, and the output shaft of the screw expander 5 is connected to the The rotor shaft of the main engine 1-1 of the single-stage oil-injected screw compressor is axially connected, and the working medium steam generating system 6 includes a condenser 61, a working medium tank 62, a working medium pump 63 and a heat exchanger, wherein the heat exchanger is composed of sequentially connected Consists of preheater 641, evaporator 642 and superheater 643. The high-temperature mixed oil-gas output end of the single-stage oil-injected screw compressor host 1-1 is connected to the oil-gas separator 8 through the check valve 7, and the gas outlet of the oil-gas separator 8 Connect the minimum pressure valve 9, the minimum pressure valve 9 is connected to the gas inlet of the preheater 641 through the pipeline, the gas outlet of the preheater 641 is connected to the water separator 10 through the pipeline, and the lubricating oil outlet of the oil-gas separator 8 is connected through the pipeline It is connected with the superheater 643, and the lubricating oil outlet of the preheater 641 is connected with the lubricating oil return port of the single-stage oil-injected screw compressor 1 through a pipeline, and the lubricating oil outlet of the preheater 641 is connected with the lubricating oil of the single-stage oil-injected screw compressor. A lubricating oil flow regulating valve 11 and a lubricating oil filter 12 are sequentially arranged on the pipeline between the oil return ports along the flow direction of the lubricating oil, and the output end of the low-temperature and low-pressure medium of the screw expander 5 is connected to the medium inlet end of the condenser 61 through the pipeline , the medium outlet end of the condenser is connected to the working medium tank 62 through pipelines, the working medium tank 62, the working medium pump 63, and the preheater 641 are connected through pipelines in turn, and the high-temperature and high-pressure medium output end of the superheater is connected through pipelines It is connected to the high-temperature and high-pressure medium input end of the screw expander 5; a filter 65 is installed on the pipeline connecting the working medium pump 63 and the working medium tank 62, and a dryer 66 is installed on the pipeline connecting the working medium pump 63 and the preheater 641 , pressure sensor P and temperature sensor T; the pipeline connecting the low-temperature and low-pressure medium output end of the screw expander and the condenser 61, and the pipeline connecting the high-temperature and high-pressure medium output end of the superheater and the high-temperature and high-pressure medium input end of the screw expander are set respectively A pressure sensor P and a temperature sensor T are provided; the condenser 61 is provided with a cooling medium circulation pipeline, and the cooling medium outlet end pipeline is provided with a cooling medium flow regulator 67; 68 is a working medium flow regulating valve, which is used to control the The flow rate of the organic working medium entering the drier 66 by the working medium pump 63 .

The working process of a single-stage oil-injection screw compressor system with an organic Rankine cycle in this embodiment will be described in detail below in conjunction with FIG. In the main unit 1-1 of the oil screw compressor, the main unit 1-1 of the single-stage oil-injected screw compressor mixes the gas and lubricating oil under the drive of the motor 2 to form high-temperature mixed oil and gas, which is forced to be discharged to the one-way valve 7, and then from the one-way The valve 7 enters the oil-gas separator 8 for oil-gas separation. The high-temperature gas after the oil-gas separation passes through the minimum pressure valve 9 and then enters the preheater through the pipeline. The water separator 10 is supplied for subsequent use, and the high-temperature lubricating oil after the oil-gas separation enters the superheater 643, the evaporator 642, and the preheater 641 through the pipeline to exchange heat into low-temperature lubricating oil, and then discharges from the lubricating oil outlet of the preheater 641 , and finally return to the main engine 1-1 of the single-stage oil-injected screw compressor after being filtered by the lubricating oil filter 12; , the dryer 66 enters the input end of the organic working medium of the preheater 641, and then flows through the preheater 641, the evaporator 642, and the superheater 643 to absorb heat and evaporate to form a high-temperature and high-pressure superheated organic working medium gas, which then enters through the pipeline The high-temperature and high-pressure working medium input end of the screw expander 5 expands and works in the screw expander 5 to output mechanical energy to the main unit 1-1 of the single-stage oil-injected screw compressor, and the auxiliary motor 2 drives the main unit 1 of the single-stage oil-injected screw compressor together. -1 continues to work, the steam working medium output from the screw expander 5 enters the condenser 61 through the pipeline, releases heat from the cooling medium in the condenser 61, condenses into a liquid working medium, and then flows into the working medium tank 62 for recirculation.

Embodiment two:

When the main screw compressor of the utility model system adopts two-stage oil-injected screw compressor 1-2, see Figure 2, the output shaft of the screw expander 5 is connected to the rotor shaft of the first-stage screw compressor 1-2a, The one-way valve 7 and the lubricating oil filter 12 are respectively connected to the second-stage screw compressor 1-2b through pipelines, and the rest of the settings and operation process are the same as those of the single-stage oil-injected screw compressor in the first embodiment.

Embodiment three:

A single-stage oil-free screw compressor system with an organic Rankine cycle, as shown in Figure 3, which includes a single-stage oil-free screw compressor host 1-3, a motor 2 that drives the single-stage oil-free screw compressor host 1-3 , the screw expander 5 and the working medium steam generation system 6, the air inlet ports of the single-stage oil-free screw compressor host 1-3 are connected to the air intake valve 3 and the air intake filter 4 in sequence, and the output shaft of the screw expander 5 is connected to the The rotor shaft of the motor 2 is axially connected, and the working medium steam generating system 6 includes a condenser 61, a working medium tank 62, a working medium pump 63 and a heat exchanger, wherein the heat exchanger is composed of a preheater 641, an evaporator 642, The superheater 643 is formed, the high-temperature gas output end of the single-stage oil-free screw compressor host 1-3 is connected to the gas inlet end of the superheater 643 through a pipeline, and the gas outlet of the preheater 641 is connected to the water separator 10 through a pipeline. The high-temperature gas discharged from the high-temperature gas output end passes through the pipeline through the superheater 643, evaporator 642, and preheater 641 in sequence, and then is discharged from the gas outlet of the preheater 641, and then separated by the water separator 10 and discharged for subsequent use. Use; the gear box 1-3a lubricating oil output end of the single-stage oil-free screw compressor host 1-3 is connected to the oil pump 13, and the oil pump 13 is connected to the lubricating oil inlet port of the preheater 641 through a pipeline, and the lubricating oil of the preheater 641 The oil outlet end is connected to the lubricating oil filter 12 through the pipeline, and the lubricating oil filter 12 is connected to the lubricating oil return end of the gearbox through the return pipeline; the low-temperature and low-pressure medium output end of the screw expander 5 is connected to the condenser 61 through the pipeline. The medium inlet port is connected, the medium outlet port of the condenser is connected with the working medium tank 62 through pipelines, the working medium tank 62, the working medium pump 63 and the preheater 641 are connected through pipelines in turn, and the high temperature and high pressure medium of the superheater is output The end is connected to the high-temperature and high-pressure medium input end of the screw expander 5 through a pipeline; a filter 65 is installed on the pipeline connecting the working medium pump 63 and the working medium tank 62, and a filter 65 is installed on the pipeline connecting the working medium pump 63 and the preheater 641 There is a dryer 66, a pressure sensor P and a temperature sensor T; the pipeline connecting the low-temperature and low-pressure medium output end of the screw expander and the condenser 61, and the pipe connecting the high-temperature and high-pressure medium output end of the superheater and the high-temperature and high-pressure medium input end of the screw expander Pressure sensors P and temperature sensors T are respectively arranged on the roads; the condenser 61 is provided with a cooling medium circulation pipeline, and the cooling medium outlet end pipeline is provided with a cooling medium flow regulator 67; 68 is a working medium flow regulating valve, its It is used to control the flow rate of the organic working medium entering the dryer 66 from the working medium pump 63 .

The working process of a single-stage oil-free screw compressor system with an organic Rankine cycle is described in detail below in conjunction with Fig. 3: on the one hand, the gas enters the single-stage oil-free screw compressor system through the intake filter 4 and the intake valve 3 The main unit 1-3 of the screw compressor compresses, and the main unit 1-3 of the single-stage oil-free screw compressor continuously increases the pressure and temperature of the gas under the drive of the motor 2 until it reaches the rated value, then it is led to the superheater 643 by the pipeline and flows through it in turn Heater 643, evaporator 642 and preheater 641 perform heat exchange and discharge heat from preheater 641 after being separated by water separator 10 and discharged for subsequent use; single-stage oil-free screw compressor host 1-3 The lubricating oil of the gearbox is pumped out through the oil pump 13, enters the preheater 641 through the pipeline for heat exchange, then flows back through the pipeline, is filtered through the lubricating oil filter 12, and then flows back into the gearbox; The organic working medium that enters the preheater 641 through the filter 65 and drier 66 is extracted from the working medium tank 62, and then flows through the preheater 641, evaporator 642, and superheater 643 to absorb heat and evaporate to form high-temperature and high-pressure superheating. The organic working medium gas enters the high-temperature and high-pressure working medium input end of the screw expander 5 through the pipeline, and expands in the screw expander 5 to do work to output mechanical energy to the motor 2, and the auxiliary motor 2 drives the single-stage oil-free screw compressor main unit together 1-3 Continuous work, the steam working medium output from the screw expander 5 enters the condenser 61 through the pipeline, and condenses into a liquid working medium after releasing heat to the cooling medium in the condenser 61, and then flows into the working medium tank 62 for recirculation .

Embodiment four:

When the main screw compressor of the utility model system adopts two-stage oil-free screw compressor 1-4, see Figure 4, the high-temperature and high-pressure gas output end of the first-stage oil-free screw compressor 1-4a enters the superheater 643 through the pipeline Then flow through the evaporator 642 and preheater 641 for heat exchange, then go through the first-stage water separator 10-1 to remove water, then enter the second-stage oil-free screw compressor 1-4b for compression again, enter the superheater 643 through the pipeline, and then sequentially After passing through the evaporator 642 and the preheater 641 for heat exchange, the secondary water separator 10-2 removes water for subsequent use. The rest of the settings and operation process are the same as the single-stage oil-free screw compressor in the third embodiment.

In the screw compressor system with organic Rankine cycle of the utility model, when the main engine of the screw compressor adopts an oil-injected screw compressor, the output shaft of the screw expander can also be directly connected with the rotor shaft of the motor, thereby assisting the motor to drive the screw The compressor is running, reducing the configured operating power of the motor to achieve the effect of energy saving and emission reduction.

The screw compressor with organic Rankine cycle of the utility model adopts organic working medium to dissipate heat for the screw compressor, and an independent superheater is installed in the heat exchanger, so that the heat exchanger and compressor system in the Rankine cycle can The temperature characteristics are matched to achieve more stable temperature control; and the screw expander can perform gas-liquid two-phase expansion work, which allows the working medium to run in the gas-liquid two-phase region, and can adapt to wider working conditions, so it has a wider range. With good adaptability, the work of the expander is more stable; and the output shaft work of the screw expander is used to directly drive the main engine of the screw compressor or the rotor of the motor to do work, and the utilization rate of the output shaft work of the expander is higher.

Claims (8)

1. A screw compressor system with an organic Rankine cycle, which includes a screw compressor main body and a motor that drives the work of the screw compressor main body, is characterized in that: it also includes a screw expander and a working medium steam generating system, The output shaft of the screw expander is connected to the rotor shaft of the main engine of the screw compressor. The working medium steam generation system includes a condenser, a working medium tank, a working medium pump and a heat exchanger. The main engine of the screw compressor The heat energy output end is connected to the heat exchanger through a pipeline, the low-temperature and low-pressure medium output end of the screw expander is connected to the condenser medium inlet end through a pipeline, and the medium outlet end of the condenser is connected to the medium outlet end through a pipeline. The working medium tank is connected, and the working medium tank, the working medium pump, and the heat exchanger are connected through pipelines in sequence, and the high-temperature and high-pressure working medium output end of the heat exchanger is connected with the high-temperature and high-pressure working medium of the screw expander through the pipeline. Working fluid input connection. 2. A screw compressor system with organic Rankine cycle according to claim 1, characterized in that: said heat exchanger comprises a preheater, an evaporator and a superheater connected in sequence, and said working medium pump It is connected with the working medium input end of the preheater, and the working medium output end of the superheater is connected with the high temperature and high pressure working medium input end of the screw expander through a pipeline. 3. A screw compressor system with an organic Rankine cycle according to claim 2, characterized in that: a filter is installed on the pipeline connecting the working medium pump and the working medium tank, and a filter is connected to the working medium pump A dryer, a pressure sensor and a temperature sensor are arranged on the pipeline with the preheater. 4. A kind of screw compressor system with organic Rankine cycle according to claim 3, characterized in that: on the pipeline connecting the low-temperature and low-pressure medium output end of the screw expander and the condenser, connecting the A pressure sensor and a temperature sensor are respectively arranged on the pipelines of the high temperature and high pressure working medium output end of the superheater and the high temperature and high pressure working medium input end of the screw expander. 5. A screw compressor system with an organic Rankine cycle according to claim 4, characterized in that: the output shaft of the screw expander is axially connected to the motor rotor shaft. 6. A kind of screw compressor system with organic Rankine cycle according to claim 4 or 5, it is characterized in that: the host of the screw compressor is an oil-injected screw compressor, and the thermal energy of the oil-injected screw compressor The output end is a high-temperature mixed oil-gas output end, and the high-temperature mixed oil-gas output end is connected to an oil-gas separator through a one-way valve, and the oil-gas separator performs oil-gas separation on the mixed oil-gas, and the gas outlet of the oil-gas separator is connected to a minimum pressure valve , the minimum pressure valve is connected to the gas inlet of the preheater through a pipeline, the gas outlet of the preheater is connected to the water separator through a pipeline, and the lubricating oil outlet of the oil-gas separator is connected to the gas outlet through a pipeline The lubricating oil outlet of the preheater is connected to the lubricating oil return port of the oil-injected screw compressor through a pipeline, and the lubricating oil outlet of the preheater is connected to the lubricating oil of the oil-injected screw compressor. A lubricating oil flow regulating valve and a lubricating oil filter are sequentially arranged along the lubricating oil flow direction on the pipeline between the oil return ports. 7. A screw compressor system with organic Rankine cycle according to claim 5, characterized in that: the screw compressor main engine is an oil-free screw compressor, and the heat energy output end of the oil-free screw compressor is A high-temperature gas output end, the high-temperature gas output end is connected to the superheater through a pipeline, the gas outlet of the preheater is connected to the water separator through a pipeline, and the high-temperature gas discharged from the high-temperature gas output end passes through the pipe After passing through the superheater, evaporator, and preheater in sequence, it is discharged from the gas outlet of the preheater, and then separated by a water separator before being discharged. 8. A screw compressor system with an organic Rankine cycle according to claim 7, characterized in that: the oil-free screw compressor's gearbox lubricating oil output end is connected to an oil pump, and the oil pump is connected through a pipeline into the lubricating oil inlet of the preheater, the lubricating oil outlet of the preheater is connected to the lubricating oil filter through the pipeline, and the lubricating oil filter is connected to the lubricating oil of the gearbox through the return pipeline return port.