CN111997751B - Utilize generator cooling system of marine diesel engine bypass waste gas - Google Patents

Utilize generator cooling system of marine diesel engine bypass waste gas Download PDF

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Publication number
CN111997751B
CN111997751B CN202010834982.XA CN202010834982A CN111997751B CN 111997751 B CN111997751 B CN 111997751B CN 202010834982 A CN202010834982 A CN 202010834982A CN 111997751 B CN111997751 B CN 111997751B
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generator
cooling water
air
diesel engine
heat exchanger
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CN111997751A (en
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丁宇
刘国政
李兵权
王聪
卢贤续
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Harbin Engineering University
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Harbin Engineering University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/08—Adaptations for driving, or combinations with, pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B41/00—Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
    • F02B41/02—Engines with prolonged expansion
    • F02B41/10—Engines with prolonged expansion in exhaust turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/10157—Supercharged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10255—Arrangements of valves; Multi-way valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10268—Heating, cooling or thermal insulating means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/26—Structural association of machines with devices for cleaning or drying cooling medium, e.g. with filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention aims to provide a generator cooling system utilizing bypass waste gas of a marine diesel engine, which comprises an air heat exchanger and a cooling water heat exchanger, wherein an exhaust pipe of the diesel engine is respectively connected with a first turbine and a second turbine through a bypass valve, a first air compressor is connected with an intercooler, the intercooler is connected with an air blower and is connected with a scavenging box through a first one-way valve, the air blower is connected with the scavenging box through a first electromagnetic valve, the scavenging box is connected with an air inlet pipe of the diesel engine, the second air compressor is connected with the air heat exchanger, the air heat exchanger is respectively connected with a second one-way valve and a pressure tank, the pressure tank is connected with a generator through a second electromagnetic valve and an expansion valve, the outlet of the cooling water tank is connected with the cooling water heat exchanger through a cooling water pump, the cooling water heat exchanger is connected with the generator through a cooling water filter, and the generator is connected with the cooling water tank. The invention can fully solve the problem of cooling the generator of the diesel generator set under different working conditions and improve the efficiency of the generator.

Description

Utilize generator cooling system of marine diesel engine bypass waste gas
Technical Field
The invention relates to a diesel engine generator, in particular to a cooling system of the diesel engine generator.
Background
The rotor coil and the stator coil of the generator have resistance, and the stator coil and the rotor coil can generate heat when the generator works normally. The temperature rise inside the generator can affect the performance of the generator, such as efficiency, output power, and the like, and the research on the heat dissipation efficiency of the generator has been paid much attention. The heat dissipation of marine generator generally adopts the water-cooled mode, and the cooling water flows through the rotor and the stator of generator, takes away the heat that the generator produced and guarantees the normal work of generator.
When the diesel engine works at low load, the turbine can fully utilize the energy of the exhaust gas discharged by the diesel engine, but when the diesel engine works at the load higher than 80% -85%, the energy of the exhaust gas is increased due to the increase of the exhaust gas volume, the rotating speed of the turbine is increased, in order to ensure that the turbine does not overspeed, the flow of the exhaust gas entering the turbine is controlled by an exhaust gas bypass method, and the bypass exhaust gas loses part of energy due to the fact that the bypass exhaust gas does not work through the turbine.
When the load of the diesel generator set is higher than 80% -85%, a part of energy of exhaust gas of the diesel engine can be wasted, and heat of the generator can not be taken away in time, so that the cooling effect of the generator at the present stage is not good when the load is high, and the performance and the efficiency of the generator are influenced. Therefore, how to prevent the generator from overheating is a problem to be solved in the field.
Disclosure of Invention
The invention aims to provide a generator cooling system utilizing bypass exhaust gas of a marine diesel engine, which can fully utilize the energy of the exhaust gas of the diesel engine and avoid the overheating problem of a generator.
The purpose of the invention is realized as follows:
the invention relates to a generator cooling system utilizing bypass waste gas of a marine diesel engine, which is characterized in that: the air cooler is connected with an air blower, the air blower is connected with a scavenging box through a first one-way valve, the air blower is connected with the scavenging box through a first electromagnetic valve, the scavenging box is connected with an air inlet pipe of the diesel engine, the air compressor of the second turbocharger is connected with the air heat exchanger, the air heat exchanger is connected with a second one-way valve and a pressure tank respectively, the pressure tank is connected with a generator through a second electromagnetic valve and an expansion valve, the outlet of the cooling water tank is connected with the cooling water heat exchanger through a cooling water pump, the cooling water heat exchanger is connected with the generator through a cooling water filter, and the generator is connected with the cooling water tank.
The present invention may further comprise:
1. when the diesel engine is under low load, all high-temperature exhaust gas discharged by the diesel engine enters the first turbine, the exhaust gas discharged by the first turbine enters the exhaust aftertreatment system, air compressed by the first air compressor flows into the intercooler for cooling, when the load of the diesel engine is lower than 40%, the air blower and the first electromagnetic valve are opened, the air blower sends compressed air in the intercooler into the scavenging box, when the load of the diesel engine is higher than 40%, the air blower and the first electromagnetic valve are closed, the compressed air directly flows into the scavenging box through the first one-way valve, and the compressed air of the scavenging box enters the diesel engine through the diesel engine air inlet pipe.
2. The diesel engine is connected together through a mechanical shaft with the generator, the diesel engine is when the low-load, the generator cools off through cooling water heat exchanger, the cooling water of cooling water tank the inside is carried the cooling water heat exchanger by cooling water pump and is cooled down, the cooling water after the cooling down is filtered impurity by the cooling water filter, get into the generator and take away the heat that the generator produced through generator cooling water import pipe, flow back to in the cooling water tank through generator cooling water outlet pipe at last, the cooling water heat exchanger uses outside sea water to cool down the heat transfer to the cooling water of generator.
3. When the load of the diesel engine is higher than 80%, the air heat exchanger and the cooling water heat exchanger are put into use together;
for cooling water heat exchangers: cooling water in the cooling water tank is conveyed to the cooling water heat exchanger by the cooling water pump to be cooled, impurities in the cooled cooling water are filtered by the cooling water filter, the cooled cooling water enters the generator through the generator cooling water inlet pipe and takes away heat generated by the generator, and finally the cooled cooling water flows back to the cooling water tank through the generator cooling water outlet pipe;
for cooling water heat exchangers: high-temperature waste gas discharged by the diesel engine is partially shunted by the bypass valve and flows into the second turbine to do work, waste gas discharged by the second turbine enters the exhaust aftertreatment system, air compressed by the second compressor is cooled to be normal-temperature high-pressure air through the air heat exchanger and is stored in the pressure tank, high-pressure air of the pressure tank is changed into low-temperature normal-pressure air after passing through the second electromagnetic valve and the expansion valve, the generator is introduced to cool the air, the heat of the generator is taken away, impurities are filtered by the air filter before the air enters the second compressor, and the air heat exchanger utilizes external seawater to reduce the temperature of the compressed air.
4. A generator cooling water outlet temperature sensor is arranged between the generator and the cooling water tank, a generator outlet gas temperature sensor is arranged at a generator gas outlet, a generator inlet gas temperature sensor is arranged at a generator gas inlet, a pressure sensor is arranged on the pressure tank, the generator cooling water outlet temperature sensor, the generator outlet gas temperature sensor, the generator inlet gas temperature sensor, the pressure sensor, a first electromagnetic valve, a second electromagnetic valve, a first check valve and a second check valve are all connected with a controller, after the generator cooling water outlet temperature reaches a set temperature threshold value, the controller opens the second electromagnetic valve to enable the air heat exchanger to work, the generator inlet gas temperature sensor and the generator outlet gas temperature sensor monitor the temperature change of inlet and outlet gas of the generator in real time, and the pressure sensor monitors the pressure change of the pressure tank in real time, the temperature change signal and the pressure change signal are transmitted to the controller, the controller controls the second electromagnetic valve to adjust the flow of the normal-temperature high-pressure gas so as to control the temperature change of the generator, the controller controls the second one-way valve to control the pressure in the pressure tank, the controller controls the bypass valve to control the bypass exhaust gas quantity, and the controller controls the first electromagnetic valve to determine the flow of the blower to the scavenging box.
The invention has the advantages that:
1. the waste gas energy of the diesel engine when the load is higher than 80-85% can be fully utilized, and the waste of energy is reduced.
2. The generator cooling system utilizing the diesel engine bypass exhaust gas can adopt a cooling mode of a liquid cooling system when the diesel generator set runs at low load, and adopts the combined use of the liquid cooling system and a gas cooling system when the diesel generator set runs at the load higher than 80-85%, so that the problem of generator cooling of the diesel generator set under different working conditions can be fully solved, and the efficiency of the generator is improved.
3. The invention can solve the working performance of the diesel generating set beyond the designed working point, realize that the diesel generating set does not have the phenomenon of overhigh temperature, improve the energy utilization rate of the diesel engine, and have simple structure, lower cost and easy realization of control.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
the invention relates to a generator cooling system utilizing bypass waste gas of a marine diesel engine, which is composed of a diesel engine 1, a diesel engine exhaust pipe 2, a bypass valve 3, a turbine I4, a gas compressor I5, an intercooler 6, a blower 7, an electromagnetic valve I8, a one-way valve I9, a scavenging box 10, a diesel engine gas inlet pipe 11, a generator 12, a generator cooling water outlet pipe 13, a cooling water tank 14, a cooling water pump 15, a cooling water heat exchanger 16, a cooling water filter 17, a generator cooling water inlet pipe 18, a turbine II 19, a gas compressor II 20, an air filter 21, an air heat exchanger 22, a pressure sensor 23, a pressure tank 24, an electromagnetic valve II 25, an expansion valve 26, a generator inlet gas temperature sensor 27, a generator outlet gas temperature sensor 28, a one-way valve II 29 and a generator cooling water outlet temperature sensor 30.
In fig. 1, the most important parts of the generator cooling system using the bypass exhaust gas of the marine diesel engine can be seen as the diesel intake and exhaust system, the generator liquid cooling system and the generator gas cooling system. When the diesel engine 1 is in low load, all high-temperature exhaust gas discharged by the diesel engine 1 enters the turbine I4, the turbine I4 is connected with the compressor I5 through a mechanical shaft, the turbine I4 drives the compressor I5 to keep the same rotating speed, external air is compressed into high-temperature high-pressure air, and the exhaust gas discharged by the turbine I4 enters the exhaust aftertreatment system. Compressed air flows into and cools down in the intercooler 6, and 1 load of diesel engine is less than 40% the time, opens air-blower 7 and I8 of solenoid valve, and air-blower 7 sends the compressed air of 6 the insides of intercooler into scavenging case 10, and 1 load of diesel engine is higher than 40% the time, and air-blower 7 and I8 of solenoid valve are closed, and compressed air directly flows into scavenging case 10 through I9 of check valve. Compressed air from the scavenging air box 10 is admitted to the diesel engine 1 via a diesel inlet line 11.
The diesel engine 1 and the generator 12 are connected together through a mechanical shaft, when the diesel engine 1 is in low load, the generator 12 only uses a liquid cooling system, and cooling water in the cooling water tank 14 is conveyed to the cooling water heat exchanger 16 by the cooling water pump 15 to be cooled. The cooled cooling water is filtered by the cooling water filter 17 to remove impurities, enters the generator 12 through the generator cooling water inlet pipe 18 to carry away heat generated by the generator 12, and finally flows back to the cooling water tank 14 through the generator cooling water outlet pipe 13. The cooling water heat exchanger 16 uses external seawater to cool and exchange heat with the cooling water of the generator 12.
When the diesel engine 1 is in a working condition that the load is higher than 80% -85%, the generator liquid cooling system and the gas cooling system are put into use together, the working state of the generator liquid cooling system is unchanged, a part of high-temperature waste gas discharged by the diesel engine 1 is shunted by the bypass valve 3 and flows into the turbine II 19 to do work, the turbine II 19 is connected with the compressor II 20 through a shaft and keeps the same rotating speed, the compressor II 20 compresses air, and the waste gas discharged by the turbine II 19 enters the exhaust aftertreatment system. The high-temperature high-pressure air is cooled down to normal-temperature high-pressure air through the air heat exchanger 22 and is stored in the pressure tank 24, the high-pressure air in the pressure tank 24 is changed into low-temperature normal-pressure air after passing through the electromagnetic valve II 25 and the expansion valve 26, the low-temperature normal-pressure air is introduced into the generator 12 to cool the generator, and heat of the generator 12 is taken away. Before the air enters the compressor II 20, impurities are filtered by an air filter 21, and the temperature of the compressed air is reduced by using the external seawater through an air heat exchanger 22.
The generator cooling water outlet temperature sensor 30 monitors the change of the generator cooling water outlet temperature and transmits a signal to the controller, and if the generator 12 cooling water outlet temperature reaches a set temperature threshold value of 70 ℃, the controller opens the electromagnetic valve II 25, so that the gas cooling system starts to work. The generator inlet gas temperature sensor 27 and the generator outlet gas temperature sensor 28 monitor the temperature change of gas entering and exiting the generator 12 in real time, the pressure sensor 23 monitors the pressure change of the pressure tank 24 in real time, the temperature change signal and the pressure change signal are transmitted to the controller, the controller controls the electromagnetic valve II 25 to adjust the flow of the normal-temperature high-pressure gas so as to control the temperature change of the generator, and the controller controls the compressor II 20 to control the pressure in the pressure tank 24. The controller controls the bypass valve 3 of the diesel engine 1 to control the amount of the bypass exhaust gas and controls the solenoid valve I8 of the intake system of the diesel engine 1 to determine the flow rate of the blower 7 to the scavenging air box 10. Meanwhile, the controller controls the rotational speed of the cooling water pump 15 of the liquid cooling system to control the flow rate of the cooling water.
The exhaust gas discharged from the diesel engine 1 is high-temperature high-pressure gas containing much energy, and in order to reduce the energy waste and fully utilize the energy in the exhaust gas, the high-temperature high-pressure exhaust gas discharged in the low-load operation is entirely flowed into the turbine i 4 through the diesel engine exhaust pipe 2, and the bypass valve 3 does not play a role in regulating the flow rate of the exhaust gas. The air compressor I5 compresses outside air into high-temperature and high-pressure air, the compressed air is cooled through the intercooler 6, the cooled compressed air is introduced into the scavenging box 10 under the action of the air blower 7 and the electromagnetic valve I8, and the compressed air enters the diesel engine through the diesel engine air inlet pipe 11.
When the generator 12 is in operation, there is current in the stator coil and the rotor coil, and there is resistance in the stator coil and the rotor coil, and the stator coil and the rotor coil generate heat under the action of the current and the resistance. The heat generated by the generator 12 in low-load operation can be timely taken away in a cooling water cooling mode, so that the generator 12 cannot be overheated. The cooling water in the cooling water tank 14 is delivered to the cooling water heat exchanger 16 by the cooling water pump 15 for cooling, and the cooling water firstly passes through the cooling water filter 17 before entering the generator 12, so that the influence of the impurities of the cooling water on the corrosion of the generator 12 is prevented. The cooling water enters the generator 12 to take away the heat generated by the generator 12, and flows back to the cooling water tank 14 through the generator cooling water outlet pipe 13, so that the whole cooling process of the generator 12 is realized.
However, when the load of the diesel generator set is higher than 80% -85%, the rotor current and the stator current of the generator 12 may increase, which causes the generator 12 to generate a large amount of heat, and the cooling water system of the generator 12 cannot take away the heat generated by the generator 12 in time, so that the temperature of the generator 12 rises, and the generator 12 may be burned out in a severe case. In order to ensure that the generator 12 can timely dissipate heat under high load, a generator 12 gas cooling system which utilizes the waste gas by-pass of the diesel engine 1 is added on the basis of a generator 12 cooling water system, so that the phenomenon of overhigh temperature of the generator 12 can be avoided. When the load of the diesel generating set is higher than 80% -85%, the energy of the exhaust gas discharged by the diesel engine 1 is increased, so that the rotating speed of the turbine I4 is increased, and in order to ensure that the turbine I4 does not overspeed, the flow of the exhaust gas entering the exhaust gas turbine is controlled by an exhaust gas bypass method. The bypassed waste gas does work on the turbine II 19, the turbine II 19 is connected with the compressor II 20 to pressurize the working medium gas, the high-temperature and high-pressure gas is cooled by the air heat exchanger 22 to be reduced into normal-temperature and high-pressure gas which is stored in the pressure tank 24, the high-pressure gas in the pressure tank 24 is changed into low-temperature and normal-pressure gas after passing through the electromagnetic valve II 25 and the expansion valve 26, and the low-temperature and normal-pressure gas is introduced into the generator 12 to be cooled.
The generator cooling water outlet temperature sensor 30 monitors the change of the temperature of the cooling water outlet of the generator 12 and transmits a signal to the controller, and if the temperature of the cooling water outlet of the generator 12 reaches a set temperature threshold value of 70 ℃, the controller opens the electromagnetic valve II 25, so that the gas cooling system starts to work. The generator inlet gas temperature sensor 27 and the generator outlet gas temperature sensor 28 monitor the temperature change of gas entering and leaving the generator 12 in real time, the pressure sensor 23 monitors the pressure change of the pressure tank 24 in real time, and the signal of the temperature change and the signal of the pressure change are transmitted to the controller. The controller controls the electromagnetic valve II 25 to adjust the flow of the normal-temperature high-pressure gas so as to control the temperature change of the generator 12, and controls the compressor II 20 to control the pressure in the pressure tank 24.
The non-return valve II 29 prevents the pressure of the pressure tank 24 from being too high. The diesel exhaust gas used by turbine i 4 and turbine ii 19 both flow into the diesel exhaust after-treatment system. The working medium of the generator gas cooling system is air. The cooling medium of the air heat exchanger 22 and the cooling water heat exchanger 16 is outside seawater.
The controller controls the bypass valve 3, the electromagnetic valve I8, the electromagnetic valve II 25, the compressor II 20 and the cooling water pump 15, and can also receive signals from a generator inlet gas temperature sensor 27, a generator outlet gas temperature sensor 28, a generator cooling water outlet temperature sensor 30 and a pressure sensor 23 for real-time monitoring.

Claims (3)

1. A generator cooling system utilizing bypass exhaust gas of a marine diesel engine is characterized in that: the system comprises a first turbocharger, a second turbocharger, an air heat exchanger and a cooling water heat exchanger, wherein an exhaust pipe of a diesel engine is respectively connected with a turbine of the first turbocharger and a turbine of the second turbocharger through bypass valves;
when the diesel engine is in low load, all high-temperature exhaust gas discharged by the diesel engine enters the first turbine, the exhaust gas discharged by the first turbine enters the exhaust aftertreatment system, air compressed by the first air compressor flows into the intercooler for cooling, when the load of the diesel engine is lower than 40%, the air blower and the first electromagnetic valve are opened, the air blower sends compressed air in the intercooler into the scavenging box, when the load of the diesel engine is higher than 40%, the air blower and the first electromagnetic valve are closed, the compressed air directly flows into the scavenging box through the first one-way valve, and the compressed air in the scavenging box enters the diesel engine through the air inlet pipe of the diesel engine;
when the load of the diesel engine is higher than 80%, the air heat exchanger and the cooling water heat exchanger are put into use together;
for cooling water heat exchangers: cooling water in the cooling water tank is conveyed to the cooling water heat exchanger by the cooling water pump to be cooled, impurities in the cooled cooling water are filtered by the cooling water filter, the cooled cooling water enters the generator through the generator cooling water inlet pipe and takes away heat generated by the generator, and finally the cooled cooling water flows back to the cooling water tank through the generator cooling water outlet pipe;
for cooling water heat exchangers: high-temperature waste gas discharged by the diesel engine is partially shunted by the bypass valve and flows into the second turbine to do work, waste gas discharged by the second turbine enters the exhaust aftertreatment system, air compressed by the second compressor is cooled to be normal-temperature high-pressure air through the air heat exchanger and is stored in the pressure tank, high-pressure air of the pressure tank is changed into low-temperature normal-pressure air after passing through the second electromagnetic valve and the expansion valve, the generator is introduced to cool the air, the heat of the generator is taken away, impurities are filtered by the air filter before the air enters the second compressor, and the air heat exchanger utilizes external seawater to reduce the temperature of the compressed air.
2. The system of claim 1, wherein the generator cooling system by-passing exhaust gas from a marine diesel engine comprises: the diesel engine is connected together through a mechanical shaft with the generator, the diesel engine is when the low-load, the generator cools off through cooling water heat exchanger, the cooling water of cooling water tank the inside is carried the cooling water heat exchanger by cooling water pump and is cooled down, the cooling water after the cooling down is filtered impurity by the cooling water filter, get into the generator and take away the heat that the generator produced through generator cooling water import pipe, flow back to in the cooling water tank through generator cooling water outlet pipe at last, the cooling water heat exchanger uses outside sea water to cool down the heat transfer to the cooling water of generator.
3. The cooling system for the generator by-passing exhaust gas of the marine diesel engine according to claim 1 or 2, wherein: a generator cooling water outlet temperature sensor is arranged between the generator and the cooling water tank, a generator outlet gas temperature sensor is arranged at a generator gas outlet, a generator inlet gas temperature sensor is arranged at a generator gas inlet, a pressure sensor is arranged on the pressure tank, the generator cooling water outlet temperature sensor, the generator outlet gas temperature sensor, the generator inlet gas temperature sensor, the pressure sensor, a first electromagnetic valve, a second electromagnetic valve, a first check valve and a second check valve are all connected with a controller, after the generator cooling water outlet temperature reaches a set temperature threshold value, the controller opens the second electromagnetic valve to enable the air heat exchanger to work, the generator inlet gas temperature sensor and the generator outlet gas temperature sensor monitor the temperature change of inlet and outlet gas of the generator in real time, and the pressure sensor monitors the pressure change of the pressure tank in real time, the temperature change signal and the pressure change signal are transmitted to the controller, the controller controls the second electromagnetic valve to adjust the flow of the normal-temperature high-pressure gas so as to control the temperature change of the generator, the controller controls the second one-way valve to control the pressure in the pressure tank, the controller controls the bypass valve to control the bypass exhaust gas quantity, and the controller controls the first electromagnetic valve to determine the flow of the blower to the scavenging box.
CN202010834982.XA 2020-08-19 2020-08-19 Utilize generator cooling system of marine diesel engine bypass waste gas Active CN111997751B (en)

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CN114893291B (en) * 2022-05-09 2023-08-08 中国铁建重工集团股份有限公司 Air inlet heating device and heating method for diesel generator set
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