CN212535796U - Semi-closed screw type waste heat power generation system - Google Patents
Semi-closed screw type waste heat power generation system Download PDFInfo
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- CN212535796U CN212535796U CN202021570829.2U CN202021570829U CN212535796U CN 212535796 U CN212535796 U CN 212535796U CN 202021570829 U CN202021570829 U CN 202021570829U CN 212535796 U CN212535796 U CN 212535796U
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Abstract
The utility model discloses a semi-closed screw waste heat power generation system, include: the working medium circulation loop is sequentially connected with the working medium pump, the evaporator, the semi-closed screw type expansion generator, the oil separator and the condenser and is connected back to the working medium pump; the oil return pipeline is connected into the oil separator from an oil return port of the evaporator; the oil supply pipeline of the expansion machine is connected into the semi-closed screw type expansion generator from the oil separator through an oil pump; and a heat exchange device. The utility model does not need a shaft coupling and a shaft seal; no need of fan cooling, and increased power generation efficiency. The evaporator reduces the temperature of the hot water outlet to the maximum extent and improves the power generation power. Returning the lubricant from the evaporator to the oil separator. The liquid refrigerant in the evaporator is evaporated after passing through the heat exchange device, so that the liquid refrigerant is prevented from entering oil content, and the oil supply and the system reliability are prevented from being influenced. The temperature of the lubricating oil after heat exchange is reduced, the exhaust temperature of the expansion machine can be reduced, and the cooling of the screw rotor and the bearing is ensured.
Description
Technical Field
The utility model relates to a semi-closed screw waste heat power generation system.
Background
An Organic Rankine Cycle (ORC) is a temperature difference Cycle power generation system, and is mainly used for converting heat energy of medium and low orders into electric power. The range of applications includes: industrial waste heat, geothermal hot springs, solar heat, biomass heat, low temperature cold energy, ocean current temperature difference, and the like. According to different heat source temperature ranges, appropriate working fluids (high-temperature working medium R245fa and low-temperature working medium R134a) can be matched, and the benefit of converting the heat energy into the electric energy is achieved.
At present, most of market screw waste heat generating sets are opening screw generating sets, and the main problem of opening screw generating sets is as follows: the shaft coupling is required to connect the generator and the open-type screw expander, so that the problems of complex installation, performance attenuation and the like exist; the generator or the screw expander needs to be provided with a shaft seal, and working medium leakage and performance attenuation are easily caused after aging; generally, an air-cooled generator needs a cooling fan, and is in an open cabin, so that the noise is high, the plateau tolerance is poor, and the power generation efficiency and the durable operation of the generator are influenced.
Meanwhile, the lubricating oil of the generator set can cool the bearing and the rotor of the screw expander in the system. The lubricant may migrate from the oil/tank to the condenser or evaporator and need to be returned from the evaporator to the oil/tank in a timely manner to ensure the lubricant needed for system operation. In addition, the liquid refrigerant enters oil content to influence oil supply and system reliability, and the high oil return temperature improves the exhaust temperature of the expansion machine and is not beneficial to cooling of a screw rotor and a bearing.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to overcome the complicated easy inefficacy of prior art temperature difference cycle power generation system structure, the generating efficiency is low, and fuel feeding and system reliability are poor, and the defect of oil return high temperature provides a semi-closed screw waste heat power generation system.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
the semi-closed screw type waste heat power generation system is characterized by comprising:
the working medium circulation loop is sequentially connected with a working medium pump, an evaporator, a semi-closed screw type expansion generator, an oil separator and a condenser and connected back to the working medium pump;
the oil return pipeline is connected into the oil separator from an oil return port of the evaporator;
the oil separator is connected with the semi-closed screw type expansion generator through an oil pump;
and one side of the heat exchange device is connected with the oil return pipeline, the other side of the heat exchange device is connected with the working medium circulation loop or the expander oil supply pipeline, and the heat exchange device is used for exchanging heat between the oil return pipeline and high-temperature gaseous working medium in the working medium circulation loop or high-temperature lubricating oil in the expander oil supply pipeline.
The scheme uses the semi-closed screw type expansion generator, and the expander and the generator rotor are coaxial, so a coupler is not needed; the expander and the generator are in the same cavity, and a shaft seal is not needed; the expander gives vent to anger and cools off the generator, does not need fan cooling, increases the generating efficiency.
After the evaporator and the oil return pipeline are arranged, the temperature of a hot water outlet is reduced to the maximum extent by the evaporator, and the power generation power is improved. The evaporator is provided with an oil return port at the position where the oil content of the mixed working medium and the lubricating oil is highest, and the lubricating oil returns to the oil separator from the evaporator. The liquid refrigerant in the evaporator is evaporated after passing through the heat exchange device, so that the liquid refrigerant is prevented from entering oil content, and the oil supply and the system reliability are prevented from being influenced. The temperature of the lubricating oil in the oil return pipeline after heat exchange is reduced, the exhaust temperature of the expansion machine can be reduced, and the cooling of a screw rotor and a bearing is ensured.
Preferably, the heat exchanging device is an oil cooler, one side of the oil cooler is connected to the oil return pipeline, the other side of the oil cooler is connected to the oil supply pipeline of the expansion machine, and the oil cooler is used for exchanging heat between the oil return pipeline and high-temperature lubricating oil in the oil supply pipeline of the expansion machine.
Preferably, one side of the oil cooler is connected between the oil pump in the expander oil supply pipeline and the pipeline of the semi-closed screw type expansion generator.
Preferably, one side of the oil cooler is connected between the evaporator in the oil return pipeline and a pipeline from the oil separator.
Preferably, the heat exchanging device is an oil return heat exchanger, one side of the oil return heat exchanger is connected to the oil return pipeline, the other side of the oil return heat exchanger is connected to the working medium circulation loop, and the oil return heat exchanger is used for exchanging heat between the oil return pipeline and high-temperature gaseous working media in the working medium circulation loop.
Preferably, one side of the oil return heat exchanger is connected between the evaporator in the working medium circulation loop and a pipeline of the semi-closed screw type expansion generator.
Preferably, one side of the oil return heat exchanger is connected between the evaporator in the oil return pipeline and the pipeline of the oil separator.
Preferably, the oil return pipeline comprises an oil filter and an oil return electromagnetic valve, and an oil return port of the evaporator is connected to the heat exchange device after being connected to the oil filter and the oil return electromagnetic valve.
Preferably, one path of the evaporator is connected into the semi-closed screw type expansion generator through an expander inlet pneumatic valve, and the other path of the evaporator is connected into the condenser through a hot gas bypass pneumatic valve. When the unit is stopped or suddenly stopped due to faults, the inlet pneumatic valve of the expansion machine is quickly closed, the hot gas bypass pneumatic valve is opened, the pressures of the evaporator and the condenser are balanced, and the phenomenon that the expansion machine of the semi-closed screw type expansion generator is over-high in rotating speed to generate runaway is prevented. When the unit is overhauled or stopped due to failure, the hot gas bypass pneumatic valve can still reduce the temperature of hot water by turning on the working medium pump, thereby reducing the influence on the user process.
Preferably, by arranging the expander air inlet filter, system impurities can be prevented from entering the interior of the expander, so that the expander is prevented from being worn or stuck.
Preferably, the oil separator is connected to the condenser through an oil outlet pneumatic valve.
The utility model discloses an actively advance the effect and lie in: the utility model uses the semi-closed screw type expansion generator, does not need a shaft coupling and a shaft seal; no need of fan cooling, and increased power generation efficiency. The evaporator reduces the temperature of the hot water outlet to the maximum extent and improves the power generation power. Returning the lubricant from the evaporator to the oil separator. The liquid refrigerant in the evaporator is evaporated after passing through the heat exchange device, so that the liquid refrigerant is prevented from entering oil content, and the oil supply and the system reliability are prevented from being influenced. The temperature of the lubricating oil after heat exchange is reduced, the exhaust temperature of the expansion machine can be reduced, and the cooling of the screw rotor and the bearing is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a semi-closed screw type cogeneration system of embodiment 1.
Fig. 2 is a schematic structural view of an evaporator according to embodiment 1.
Fig. 3 is a schematic structural diagram of a semi-closed screw type cogeneration system of embodiment 2.
Detailed Description
The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 and fig. 2, the present embodiment discloses a semi-closed screw type waste heat power generation system, which is a low temperature type unit, and the semi-closed screw type waste heat power generation system of the present embodiment includes a working medium circulation loop a, in which a working medium pump 71, an evaporator 2, a semi-closed screw type expansion generator 1, an oil separator 3, and a condenser 4 are sequentially connected and connected back to the working medium pump 71.
The semi-closed screw type waste heat power generation system of the embodiment comprises an oil return pipeline B, and the oil return pipeline B is connected into the oil separator 3 from an oil return port 20 of the evaporator 2.
The semi-closed screw waste heat power generation system of the present embodiment includes an expander oil supply line C that is connected from the oil separator 3 to the semi-closed screw expansion generator 1 through an oil pump 72.
The semi-closed screw type waste heat power generation system comprises an oil cooler 51, wherein one side of the oil cooler 51 is connected with an oil return pipeline B, the other side of the oil cooler 51 is connected with an expander oil supply pipeline C, and the oil cooler 51 is used for exchanging heat between the oil return pipeline B and high-temperature lubricating oil in the expander oil supply pipeline C.
As shown in fig. 1, one side of the oil cooler 51 is connected between the oil pump 72 in the expander oil supply line C and the line of the semi-closed screw type expansion generator 1. One side of the oil cooler 51 is connected between the evaporator 2 and the oil separator 3 in the oil return line B.
In the embodiment, the semi-closed screw type expansion generator 1 is used, and the expander and the generator rotor are coaxial, so that a coupler is not needed; the expander and the generator are in the same cavity, and a shaft seal is not needed; the expander gives vent to anger and cools off the generator, does not need fan cooling, increases the generating efficiency.
After the evaporator 2 and the oil return pipeline B are arranged, the temperature of the hot water outlet is reduced to the maximum extent by the evaporator 2, and the power generation power is improved. The evaporator 2 is provided with an oil return opening 20 at the position where the oil content of the mixed working medium and lubricating oil is highest, and the lubricating oil returns to the oil separator 3 from the evaporator 2. The liquid refrigerant in the evaporator 2 is evaporated after passing through the oil cooler 51, and the liquid refrigerant is prevented from entering oil components, which affects oil supply and system reliability. The temperature of the lubricating oil in the oil return pipeline B after heat exchange is reduced, the exhaust temperature of the expansion machine can be reduced, and the cooling of a screw rotor and a bearing is ensured.
As shown in fig. 1, the return line B includes an oil filter 61 and a return solenoid valve 62, and the oil return port 20 of the evaporator 2 is connected to the oil filter 61 and the return solenoid valve 62 and then to the oil cooler 51.
As shown in fig. 1, one path of the evaporator 2 is connected to the semi-closed screw type expansion power generator 1 through an expander inlet air-operated valve 81, and the other path of the evaporator 2 is connected to the condenser 4 through a hot air bypass air-operated valve 82. When the unit is stopped or suddenly stopped due to faults, the inlet pneumatic valve 81 of the expansion machine is quickly closed, the hot gas bypass pneumatic valve 82 is opened, the pressures of the evaporator 2 and the condenser 4 are balanced, and the phenomenon that the speed of the expansion machine of the semi-closed screw type expansion generator 1 is too high to generate runaway is prevented. When the unit is overhauled or stopped due to failure, the hot gas bypass pneumatic valve 82 can still reduce the temperature of hot water by turning on the working medium pump 71, thereby reducing the influence on the user process.
As shown in fig. 1, by providing the expander intake filter 9, system impurities can be prevented from entering the interior of the expander, causing wear or seizure of the expander. As shown in fig. 1, the oil separator 3 is connected to the condenser 4 through an oil outlet pneumatic valve 83.
As shown in fig. 2, the evaporator 2 of the present embodiment includes an oil return port 20, a working medium outlet 21, a working medium inlet 22, a hot water outlet 23, and a hot water inlet 24.
The specific operation of this embodiment is as follows
First, working medium circulation loop A
1. The low-pressure liquid working medium fluid passes through the working medium pump 71, the working medium fluid is boosted to be in a high-pressure super-cooled liquid state, and then enters the evaporator 2;
2. when the high-pressure liquid organic working medium fluid permeates the evaporator 2 to absorb the heat energy of the heat transfer medium (steam, hot water, heat medium oil and the like) and is evaporated into a high-pressure saturated vapor state or an overheated vapor state, the high-pressure saturated vapor state or the overheated vapor state enters the semi-closed screw type expansion generator 1;
3. high-pressure saturated/superheated steam organic working medium fluid enters the semi-closed screw type expansion generator 1 after passing through the expander air inlet filter 9 and the expander inlet pneumatic valve 81 (normal operation: the expander inlet pneumatic valve 81 is opened, and the hot gas bypass valve 82 is closed), pushes the screw rotor to rotate, outputs power outwards, reduces pressure at the same time, and becomes low-pressure superheated organic working medium (lubricating oil is mixed with the low-pressure superheated organic working medium to enter oil component after lubricating and cooling the bearing and the rotor);
4. the rotor of the expansion machine rotates to drive the generator, and then the shaft power of the generator is converted into electric power through magnetoelectricity to be output to a power grid feeder line for use;
5. after the expanded low-pressure superheated vapor organic working fluid (mixed with lubricating oil) passes through the oil separator 3, the organic working fluid enters the condenser 4, exchanges heat with cooling water and is condensed into liquid, and enters the working fluid pump 71 again to complete an ORC circulating system and uninterruptedly and circularly recycle heat energy for utilization;
6. when the unit is shut down, the expander inlet pneumatic valve 81 and the oil outlet pneumatic valve 83 are closed, while the hot gas bypass pneumatic valve 82 is opened, balancing the pressures of the evaporator 2 and the condenser 4.
Second, return oil pipeline B
For a low-temperature type unit (the temperature of hot water is less than 90 ℃, the low-temperature type unit uses R134a working medium), from the oil return port 20 (high pressure) of the evaporator 2, after a mixture of the working medium and lubricating oil passes through a valve, an oil filter 61 and an oil return electromagnetic valve 62, the mixture exchanges heat with high-temperature gaseous organic working medium, the organic working medium on the oil return side is evaporated to be gaseous, and the gaseous organic working medium and the lubricating oil return to the oil separator 3.
Oil supply pipeline C of expansion machine
1. From the outlet of the semi-closed screw type expansion generator 1, the mixture of the organic working medium (gas state) and the lubricating oil (liquid state) enters an oil separator 3;
2. the major part of the lubricating oil (liquid) is separated in the oil separator 3, and the pressure is raised by the oil pump 72 to lubricate the expander rotor and the bearings of the semi-closed screw type expansion generator 1.
Example 2
As shown in fig. 3, the present embodiment discloses a semi-closed screw type waste heat power generation system, which is a high temperature type unit, and the semi-closed screw type waste heat power generation system includes a working medium circulation loop a, in which a working medium pump 71, an evaporator 2, a semi-closed screw type expansion generator 1, an oil separator 3, and a condenser 4 are sequentially connected and connected back to the working medium pump 71.
The semi-closed screw type waste heat power generation system of the embodiment comprises an oil return pipeline B, and the oil return pipeline B is connected into the oil separator 3 from an oil return port 20 of the evaporator 2.
The semi-closed screw waste heat power generation system of the present embodiment includes an expander oil supply line C that is connected from the oil separator 3 to the semi-closed screw expansion generator 1 through an oil pump 72.
The semi-closed screw type waste heat power generation system of the embodiment comprises an oil return heat exchanger 52, wherein one side of the oil return heat exchanger 52 is connected to an oil return pipeline B, the other side of the oil return heat exchanger 52 is connected to a working medium circulation loop A, and the oil return heat exchanger 52 is used for exchanging heat between the oil return pipeline B and a high-temperature gaseous working medium in the working medium circulation loop A.
As shown in fig. 3, one side of the oil-return heat exchanger 52 is connected between the evaporator 2 in the working medium circulation circuit a and the pipeline of the semi-closed screw type expansion generator 1. One side of the oil-return heat exchanger 52 is connected between the lines from the evaporator 2 to the oil separator 3 in the oil-return line B.
In the embodiment, the semi-closed screw type expansion generator 1 is used, and the expander and the generator rotor are coaxial, so that a coupler is not needed; the expander and the generator are in the same cavity, and a shaft seal is not needed; the expander gives vent to anger and cools off the generator, does not need fan cooling, increases the generating efficiency.
After the evaporator 2 and the oil return pipeline B are arranged, the temperature of the hot water outlet is reduced to the maximum extent by the evaporator 2, and the power generation power is improved. The evaporator 2 is provided with an oil return opening 20 at the position where the oil content of the mixed working medium and lubricating oil is highest, and the lubricating oil returns to the oil separator 3 from the evaporator 2. The liquid refrigerant in the evaporator 2 is evaporated after passing through the oil heat exchanger, so that the liquid refrigerant is prevented from entering oil content, and the oil supply and the system reliability are prevented from being influenced. The temperature of the lubricating oil in the oil return pipeline B after heat exchange is reduced, the exhaust temperature of the expansion machine can be reduced, and the cooling of a screw rotor and a bearing is ensured.
As shown in fig. 3, the oil return line B includes an oil filter 61 and an oil return solenoid valve 62, and the oil return port 20 of the evaporator 2 is connected to the oil filter 61 and the oil return solenoid valve 62 and then to the oil heat exchanger.
As shown in fig. 3, one path of the evaporator 2 is connected to the semi-closed screw type expansion power generator 1 through an expander inlet pneumatic valve 81, and the other path of the evaporator 2 is connected to the condenser 4 through a hot gas bypass pneumatic valve 82. When the unit is stopped or suddenly stopped due to faults, the inlet pneumatic valve 81 of the expansion machine is quickly closed, the hot gas bypass pneumatic valve 82 is opened, the pressures of the evaporator 2 and the condenser 4 are balanced, and the phenomenon that the speed of the expansion machine of the semi-closed screw type expansion generator 1 is too high to generate runaway is prevented. When the unit is overhauled or stopped due to failure, the hot gas bypass pneumatic valve 82 can still reduce the temperature of hot water by turning on the working medium pump 71, thereby reducing the influence on the user process.
By providing the expander inlet filter 9 as shown in fig. 3, system impurities can be prevented from entering the interior of the expander, causing wear or seizure of the expander. The oil separator 3 is connected to the condenser 4 through an oil outlet pneumatic valve 83 as shown in fig. 3.
The specific operation of this embodiment is as follows
First, working medium circulation loop A
1. The low-pressure liquid working medium fluid passes through the working medium pump 71, the working medium fluid is boosted to be in a high-pressure super-cooled liquid state, and then enters the evaporator 2;
2. when the high-pressure liquid organic working medium fluid permeates the evaporator 2 to absorb the heat energy of the heat transfer medium (steam, hot water, heat medium oil and the like) and is evaporated into a high-pressure saturated vapor state or an overheated vapor state, the high-pressure saturated vapor state or the overheated vapor state enters the semi-closed screw type expansion generator 1;
3. high-pressure saturated/superheated steam organic working medium fluid enters the semi-closed screw type expansion generator 1 after passing through the expander air inlet filter 9 and the expander inlet pneumatic valve 81 (normal operation: the expander inlet pneumatic valve 81 is opened, and the hot gas bypass valve 82 is closed), pushes the screw rotor to rotate, outputs power outwards, reduces pressure at the same time, and becomes low-pressure superheated organic working medium (lubricating oil is mixed with the low-pressure superheated organic working medium to enter oil component after lubricating and cooling the bearing and the rotor);
4. the rotor of the expansion machine rotates to drive the generator, and then the shaft power of the generator is converted into electric power through magnetoelectricity to be output to a power grid feeder line for use;
5. after the expanded low-pressure superheated vapor organic working fluid (mixed with lubricating oil) passes through the oil separator 3, the organic working fluid enters the condenser 4, exchanges heat with cooling water and is condensed into liquid, and enters the working fluid pump 71 again to complete an ORC circulating system and uninterruptedly and circularly recycle heat energy for utilization;
6. when the unit is shut down, the expander inlet pneumatic valve 81 and the oil outlet pneumatic valve 83 are closed, while the hot gas bypass pneumatic valve 82 is opened, balancing the pressures of the evaporator 2 and the condenser 4.
Second, return oil pipeline B
For a high-temperature type unit (the hot water temperature is more than 90 ℃, the high-temperature type unit uses R245fa working medium), from the oil return port 20 (high pressure) of the evaporator 2, after a mixture of the working medium and the lubricating oil passes through a valve, an oil filter 61 and an oil return electromagnetic valve 62, the mixture exchanges heat with the high-temperature lubricating oil, the organic working medium is evaporated to be gaseous, and the gaseous organic working medium and the lubricating oil return to the oil separator 3;
oil supply pipeline C of expansion machine
1. From the outlet of the semi-closed screw type expansion generator 1, the mixture of the organic working medium (gas state) and the lubricating oil (liquid state) enters an oil separator 3;
2. the major part of the lubricating oil (liquid) is separated in the oil separator 3, and the pressure is raised by the oil pump 72 to lubricate the expander rotor and the bearings of the semi-closed screw type expansion generator 1.
The utility model uses the semi-closed screw type expansion generator, does not need a shaft coupling and a shaft seal; no need of fan cooling, and increased power generation efficiency. The evaporator reduces the temperature of the hot water outlet to the maximum extent and improves the power generation power. Returning the lubricant from the evaporator to the oil separator. The liquid refrigerant in the evaporator is evaporated after passing through the heat exchange device, so that the liquid refrigerant is prevented from entering oil content, and the oil supply and the system reliability are prevented from being influenced. The temperature of the lubricating oil after heat exchange is reduced, the exhaust temperature of the expansion machine can be reduced, and the cooling of the screw rotor and the bearing is ensured.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. The semi-closed screw type waste heat power generation system is characterized by comprising:
the working medium circulation loop is sequentially connected with a working medium pump, an evaporator, a semi-closed screw type expansion generator, an oil separator and a condenser and connected back to the working medium pump;
the oil return pipeline is connected into the oil separator from an oil return port of the evaporator;
the oil separator is connected with the semi-closed screw type expansion generator through an oil pump;
and one side of the heat exchange device is connected with the oil return pipeline, the other side of the heat exchange device is connected with the working medium circulation loop or the expander oil supply pipeline, and the heat exchange device is used for exchanging heat between the oil return pipeline and high-temperature gaseous working medium in the working medium circulation loop or high-temperature lubricating oil in the expander oil supply pipeline.
2. The semi-closed screw type waste heat power generation system according to claim 1, wherein the heat exchange device is an oil cooler, one side of the oil cooler is connected to the oil return pipeline, the other side of the oil cooler is connected to the expander oil supply pipeline, and the oil cooler is used for exchanging heat between the oil return pipeline and high-temperature lubricating oil in the expander oil supply pipeline.
3. The semi-closed screw cogeneration system of claim 2, wherein one side of said oil cooler is connected between said oil pump in said expander oil supply line and said semi-closed screw expander generator line.
4. The semi-closed screw type waste heat power generation system of claim 2, wherein one side of the oil cooler is connected between the evaporator in the oil return line and the oil separator line.
5. The semi-closed screw type waste heat power generation system of claim 1, wherein the heat exchange device is an oil return heat exchanger, one side of the oil return heat exchanger is connected to the oil return pipeline, the other side of the oil return heat exchanger is connected to the working medium circulation loop, and the oil return heat exchanger is used for heat exchange between the oil return pipeline and a high-temperature gaseous working medium in the working medium circulation loop.
6. The semi-closed screw type waste heat power generation system of claim 5, wherein one side of the oil return heat exchanger is connected between the evaporator in the working medium circulation loop and a pipeline of the semi-closed screw type expansion generator.
7. The semi-closed screw type waste heat power generation system of claim 5, wherein one side of the oil return heat exchanger is connected between the evaporator in the oil return pipeline and the pipeline of the oil separator.
8. The semi-closed screw type waste heat power generation system of claim 1, wherein the oil return pipeline comprises an oil filter and an oil return electromagnetic valve, and an oil return port of the evaporator is connected to the heat exchange device after being connected to the oil filter and the oil return electromagnetic valve.
9. The semi-closed screw cogeneration system of claim 1 wherein one path of said evaporator is connected to the semi-closed screw expansion generator through an expander inlet pneumatic valve and the other path of said evaporator is connected to said condenser through a hot gas bypass pneumatic valve.
10. The semi-closed screw cogeneration system of claim 1, wherein said oil separator is ported to said condenser through an oil outlet pneumatic valve.
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