CN206592292U - A kind of waste-heat recovery device of screw air compressor - Google Patents

Abstract

The utility model relates to a waste heat recovery device of a screw air compressor. It has the advantages of high heat energy recovery efficiency, compact structure, and good economic benefits. It can be widely used in the waste heat recovery of screw air compressors, and has very large social and economic benefits. The technical scheme of the utility model comprises a screw compressor, a screw compressor connected with an oil-gas separator, the oil-gas separator connected with a regenerator and an evaporator respectively, the regenerator connected with a gas cooler and a working medium pump respectively, and the working medium pump It is connected with the condenser, the evaporator is respectively connected with the oil cooler and the screw expander, the screw expander is connected with the condenser, the oil-gas separator is also connected with a temperature control valve, and the temperature control valve is connected with the screw compressor and the oil cooler respectively .

Description

Waste heat recovery device for screw air compressor

technical field

The utility model relates to a waste heat recovery device of a screw air compressor.

Background technique

Screw air compressor is the most commonly used gas power equipment in the industrial field, and its energy consumption accounts for about 10% of the total energy consumption of the factory, which is a huge energy consumption. Generally speaking, the working process of the oil-injected screw air compressor is: suction-compression-exhaust process. During the air compression process, the male and female rotors of the compressor need lubricating oil for sealing and cooling. The compressed air contains A large amount of high-temperature lubricating oil, the oil-air mixture is separated from the oil and air through the oil-gas separator. After the separation, the high-temperature lubricating oil needs to be cooled, and then injected into the rotor chamber and bearing of the compressor for cooling and lubrication. The cooling method of lubricating oil includes There are two ways of air cooling and water cooling; the separated gas needs to be cooled by a gas cooler, and then supplied to occasions that require high-pressure gas. In the electric energy consumed by the screw air compressor, part of it is used to compress the gas to do work and generate high-pressure air; while the other part is converted into heat energy, which is contained in the compressed air and lubricating oil, and this part of heat energy is released into the air in vain .

Due to the low grade of thermal energy of the oil-injected screw air compressor and the relatively dispersed heat, the existing technology usually adopts the method of hot water recovery, which has low efficiency and complicated system layout, and it is difficult to find a Appropriate power machinery for energy recovery.

Utility model content

The utility model provides a waste heat recovery device for a screw air compressor in order to solve the problems in the prior art that the thermal energy grade of the oil-injected screw air compressor is low, the heat is scattered and cannot be directly and efficiently utilized.

In order to solve the problems existing in the prior art, the technical solution of the utility model is: a waste heat recovery device of a screw air compressor, which is characterized in that it includes a screw compressor, an oil-gas separator, a regenerator, an evaporator, and a screw expansion machine, condenser, working medium pump, gas cooler, oil cooler and temperature control valve;

The oil-gas mixture discharged from the screw compressor enters the oil-gas separator, where the initial effect and high-efficiency oil-gas separation is carried out, and the clean high-temperature and high-pressure gas after efficient separation enters the regenerator for heat exchange. The clean gas after heat exchange in the regenerator enters the gas cooler for cooling, and the cooled high-pressure clean gas is delivered to the user end;

The high-temperature lubricating oil in the oil-gas separator enters the evaporator for heat exchange, the lubricating oil after heat exchange enters the oil cooler for cooling, and the lubricating oil cooled by the oil cooler enters the temperature control valve, and the temperature control The inlet pipeline of the valve is composed of two lines, one is the high-temperature lubricating oil in the oil-gas separator, and the other is the low-temperature lubricating oil after the oil cooler has cooled down, and the two-way lubricating oil is proportionally mixed in the temperature control valve to adjust the oil temperature;

The regenerator is provided with two fluid passages, one of which passes through the clean high-temperature and high-pressure gas after the initial effect and high-efficiency oil-gas separation in the oil-gas separator, and the other is the organic working medium liquid transported by the working medium pump, and the regenerator The organic working medium liquid in the heat exchange with the clean high temperature and high pressure gas, the organic working medium liquid absorbs the heat in the high temperature gas; the organic working medium liquid after absorbing the heat and rising in temperature enters the evaporator, and the evaporator is equipped with One is the high-temperature lubricating oil in the oil-gas separator, the other is the organic working liquid; the organic working liquid absorbs the heat of the high-temperature lubricating oil to evaporate, and the evaporated gas organic working liquid generates high temperature and high pressure in the evaporator The high-temperature and high-pressure gaseous organic working medium enters the screw expander to perform expansion work. After the expansion work, the high-temperature and high-pressure gaseous organic working medium becomes a low-temperature and low-pressure gaseous organic working medium, which enters the condenser. The gaseous organic working medium is condensed in the condenser, and the low-temperature and low-pressure liquid organic working medium is transported to the regenerator through the working medium pump.

The screw compressor and the main shaft of the screw expander are arranged together, and the main shaft of the screw compressor is connected with the main shaft of the screw expander through a gear box or a coupling.

The screw compressor is a single-stage compression structure or a two-stage compression structure.

The gas cooler is an air-cooled or water-cooled structure.

The oil cooler is air-cooled or water-cooled.

The working medium pump is a centrifugal or gear structure.

Compared with prior art, the utility model has the following advantages:

The utility model has the advantages of high heat energy recovery efficiency, compact structure, good economic benefits, etc. It can be widely used for waste heat recovery of screw air compressors, and has very large social and economic benefits.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Description of reference signs: 1-screw compressor, 2-oil-gas separator, 3-regenerator, 4-evaporator, 5-screw expander, 6-condenser, 7-working medium pump, 8-gas cooler , 9-oil cooler, 10-temperature control valve.

detailed description

Below in conjunction with accompanying drawing this design is described in further detail:

A waste heat recovery device for a screw air compressor, comprising a screw compressor 1, an oil-gas separator 2, a regenerator 3, an evaporator 4, a screw expander 5, a condenser 6, a working medium pump 7, a gas cooler 8, Oil cooler 9 and temperature control valve 10; the main shaft of the screw compressor 1 and the screw expander 5 is arranged together, and the main shaft of the screw compressor 1 is connected with the main shaft of the screw expander 5 through a gear box or a coupling Together.

The oil-gas mixture discharged from the screw compressor 1 enters the oil-gas separator 2, where the initial effect and high-efficiency oil-gas separation is performed in the oil-gas separator 2, and the clean high-temperature and high-pressure gas after efficient separation enters the regenerator 3 for further Heat exchange, the clean gas after heat exchange through the regenerator 3 enters the gas cooler 8 for cooling, and the cooled high-pressure clean gas is delivered to the user end;

The high-temperature lubricating oil in the oil-gas separator 2 enters the evaporator 4 for heat exchange, the lubricating oil after heat exchange enters the oil cooler 9 for cooling, and the lubricating oil cooled by the oil cooler 9 enters the temperature control valve In 10, the inlet pipeline of the temperature control valve 10 is composed of two lines, one line is the high-temperature lubricating oil in the oil-gas separator 2, and the other line is the low-temperature lubricating oil after the oil cooler 9 has cooled down, and the two lines of lubricating oil are in the temperature control valve. Perform proportional mixing and adjust oil temperature;

The regenerator 3 is provided with two fluid channels, one of which passes through the clean high-temperature and high-pressure gas after the initial effect and high-efficiency oil-gas separation in the oil-gas separator 2, and the other channel is the organic working medium liquid transported by the working medium pump 7, The organic working medium liquid in the regenerator 3 exchanges heat with the clean high-temperature and high-pressure gas, and the organic working medium liquid absorbs the heat in the high-temperature gas; the organic working medium liquid that has absorbed heat and rises in temperature enters the evaporator 4 and evaporates There are two fluid channels in the device 4, one is the high-temperature lubricating oil in the oil-gas separator 2, and the other is the organic working medium liquid; the organic working medium liquid absorbs the heat of the high-temperature lubricating oil to evaporate, and the evaporated gas organic working medium liquid The high-temperature and high-pressure gaseous organic working medium is generated in the evaporator 4, and the high-temperature and high-pressure gaseous organic working medium enters the screw expander 5 to perform expansion work, and the high-temperature and high-pressure gaseous organic working medium after the expansion work becomes a low-temperature and low-pressure gaseous organic working medium , into the condenser 6, the low-temperature and low-pressure gaseous organic working medium is condensed in the condenser 6, and the low-temperature and low-pressure liquid organic working medium is transported to the regenerator 3 by the working medium pump 7.

The screw compressor 1 is a single-stage compression structure or a two-stage compression structure.

The gas cooler 8 is an air-cooled or water-cooled structure.

The oil cooler 9 is an air-cooled or water-cooled structure.

The working medium pump 7 is a centrifugal or gear structure.

The screw expander has a pair of intermeshing male and female rotors, and the screw air compressor also has a pair of intermeshing male and female rotors, and the male rotor of the screw expander and the male rotor of the air compressor are connected together, you can directly The work output by the screw expander is directly input into the screw air compressor. Its structure determines that the screw expander system is suitable for the recovery of waste heat of screw air compressors, and it is a high-tech technology with a very wide range of applications that specializes in recovering waste heat of screw air compressors.

The working process of the utility model: after the screw compressor 1 of the gas compression system compresses the gas, the discharged high-temperature and high-pressure oil-gas mixture enters the oil-gas separator 2 for oil-gas separation, and the separated high-temperature and high-pressure gas enters the regenerator 3 to be mixed with the working medium In the expansion system, the low-temperature and high-pressure liquid organic working medium delivered by the working medium pump 7 performs heat exchange, and the high-pressure clean gas after heat exchange enters the gas cooler 8 for gas cooling, and the cooled high-pressure clean gas is delivered to the user; The high-temperature and high-pressure lubricating oil separated by the separator 2 enters the evaporator 4 to exchange heat with the low-temperature and high-pressure liquid organic working medium reheated in the regenerator 3, and the low-temperature and high-pressure liquid organic working medium evaporates after the heat exchange, resulting in high temperature The high-pressure gas organic working medium enters the screw expander 5 to expand and perform work, and the lubricating oil after heat exchange enters the oil cooler 9 for cooling; the cooled lubricating oil and the lubricating oil in the oil-gas separator 2 enter the temperature control valve 10 for mixing. The mixed lubricating oil enters the screw compressor 1 for lubrication, cooling and sealing. The main shaft of the screw expander 5 and the main shaft of the screw compressor 1 are connected together through a gear box or a coupling, and the low-temperature and low-pressure gas organic working medium after expansion enters the condenser 6, and is condensed into a low-temperature and low-pressure liquid organic working medium. The working medium pump 7 transports the liquid organic working medium to the regenerator 3 for reheating.

The above descriptions are not intended to limit the utility model, and the utility model is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the utility model all belong to this invention. Protection scope of utility model.

Claims (6)

1. a kind of waste-heat recovery device of screw air compressor, it is characterised in that：Including helical-lobe compressor（1）, Oil-gas Separation Device（2）, regenerator（3）, evaporator（4）, screw expander（5）, condenser（6）, working medium pump（7）, gas cooler（8）, oil Cooler（9）And temperature-sensing valve（10）；

Described helical-lobe compressor（1）The oil gas mixture of discharge, enters gs-oil separator（2）In, in gs-oil separator（2） Effect at the beginning of middle progress and efficiently Oil-gas Separation, the clean high temperature and high pressure gas after efficiently separating enter regenerator（3）It is middle to be exchanged heat, Pass through regenerator（3）Clean gas after heat exchange enters gas cooler（8）It is middle to be cooled down, the high pressure clean gas after cooling It is delivered to user terminal；

Gs-oil separator（2）In high temperature grease enter evaporator（4）It is middle to be exchanged heat, entered by the lubricating oil after heat exchange Oil cooler（9）It is middle to be cooled down, pass through oil cooler（9）Lubricating oil after being cooled enters temperature-sensing valve（10）In, temperature Control valve（10）Entrance pipe be made up of two-way, be all the way gs-oil separator（2）In high temperature grease, be all the way oil cooler （9）Subzero oil after being cooled, two-way lubricating oil carries out ratio mixing in temperature-sensing valve, adjusts oil temperature；

Described regenerator（3）In be provided with two-way fluid passage, pass through gs-oil separator all the way（2）Imitated at the beginning of middle progress and efficient Clean high temperature and high pressure gas after Oil-gas Separation, are working medium pump all the way in addition（7）The organic working medium liquid of conveying, regenerator（3） In organic working medium liquid heat in heat exchange, organic working medium liquid absorption high-temperature gas is carried out with clean high temperature and high pressure gas Amount；Absorb the organic working medium liquid after heat heating and enter described evaporator（4）In, evaporator（4）In be provided with two-way Fluid passage, is all the way gs-oil separator（2）In high temperature grease, be all the way organic working medium liquid；Organic working medium liquid is inhaled The heat for receiving high temperature grease is evaporated, and the gas organic working medium liquid after evaporation is in evaporator（4）Middle generation HTHP Gas organic working medium, the gas organic working medium of HTHP enters screw expander（5）Middle carry out expansion work, expansion work The gas organic working medium of HTHP afterwards is changed into the gas organic working medium of low-temp low-pressure, into condenser（6）In, low-temp low-pressure Gas organic working medium in condenser（6）Middle to be condensed, the liquid organic working medium of low-temp low-pressure passes through working medium pump（7）By liquid Organic working medium is transported to regenerator（3）In.

2. a kind of waste-heat recovery device of screw air compressor according to claim 1, it is characterised in that：Described spiral shell Bar compressor（1）With screw expander（5）Main shaft be set together, helical-lobe compressor（1）Main shaft pass through gear-box or connection Axle device and screw expander（5）Main shaft link together.

3. a kind of waste-heat recovery device of screw air compressor according to claim 1 or 2, it is characterised in that：It is described Helical-lobe compressor（1）For single stage compress structure or Two-stage Compression structure.

4. a kind of waste-heat recovery device of screw air compressor according to claim 3, it is characterised in that：Described gas Body cooler（8）For air-cooled or water-cooling structure.

5. a kind of waste-heat recovery device of screw air compressor according to claim 4, it is characterised in that：Described oil Cooler（9）For air-cooled or water-cooling structure.

6. a kind of waste-heat recovery device of screw air compressor according to claim 5, it is characterised in that：Described work Matter pump（7）For centrifugation or gear structure.