Cogeneration plant with stirling engine operating on locally available fuel

FIELD: power engineering.

SUBSTANCE: invention relates to cogeneration plants with Stirling engines designed for simultaneous production of electric energy and heat. Proposed cogeneration plant includes Stirling engine with electric generator fitted on one shaft, Stirling engine cooling system including pump an heat exchange-cooler through which air feed main line passes, external heat supply system with heat exchanger-recovering unit of heat of waste gases and heat exchanger of preliminary heating through which external heat supply system is coupled with cooling system of Stirling engine, and exhaust gas main line. Plant is furnished additionally with gas generator providing production of generator gas from different types tires of locally available fuel, generator gas main line connecting gas generator with combustion chamber of Stirling engine, main line for partial return of exhaust gases into combustion chamber of stirling engine, pump in external heat supply system providing flow of heat carrier in succession through preliminary heating heat exchanger and heat exchanger-recovering unit of heat of waste gases. Wood, peat and oil shale can be used as locally available fuel.

EFFECT: possibility of operation of different locally available fuels such as wood, peat, oil shale, etc, increased service life of engine, simplified design of system to convey heat from engine to external consumers.

1 dwg

 

The invention relates to the field of Autonomous energy and cogeneration plants with Stirling engines, designed for the simultaneous production of electricity and heat.

The well-known principle and device of the Stirling engine, comprising a combustion chamber, fuel injector, heater, hot chamber, a regenerator, a displacer, a work piston, the fridge, the cold cavity, the cylinder and the actuator (Grider, Choper. Stirling Engines. M.: Izd. Mir, 1986, p.55).

A device of the gas generators for the production of producer gas from local fuels (wood, peat, shale, etc.) and its application in internal combustion engines, heating furnaces, steam boilers, etc. (Tagaev DL the Use of local fuels. Leningrad, 1940, p.14-21). However, it is not known the use of producer gas in engines with external heat supply in Stirling engines.

Know the structure of modern gas-turbine generating unit, which derived producer gas contains up to 27% N2with a lower calorific value of up to 5 MJ/m3(Leontiev, A., Panikov NV, Smolyakov A.F. Receipt and use of gaseous fuels from wood waste. Browse infirm. - M: Was, VIP, 1986. - 24 S.)

A device combined Stirling-installation for one is producing both electricity and heat, includes a Stirling engine with generator on the same shaft, the cooling system of the Stirling engine, having in its composition a pump and a heat exchanger-cooler, through which the supply line to the air, a system of external heating with heat exchanger-a heat exchanger, exhaust gas heat exchanger preheating, through which the external heat supply is connected with the cooling system of the Stirling engine, and the line of exhaust gases (RF Patent No. 2196243, bull. No. 1, 10.01.2003). However, the device of this cogeneration plant is not adapted to work on domestic fuel, has a complex design associated with the use of steam.

The technical result, which can be obtained by carrying out the invention, consists in the possibility of installation on various types of local fuel, increasing the service life of the engine and simplifying the structure of the system of heat transfer from the engine to external customers.

To achieve this technical result cogeneration unit with Stirling engine on domestic fuel, comprising a Stirling engine with generator on the same shaft, the cooling system of the Stirling engine, having in its composition a pump and a heat exchanger-cooler through which the magician is stroll air supply, a system of external heating with heat exchanger-a heat exchanger, exhaust gas heat exchanger preheating, through which the external heat supply is connected with the cooling system of the Stirling engine, and the line of exhaust gases supplied by the gas generator for the production of producer gas from different types of local fuel, generator gas line connecting the generator with a combustion chamber of the Stirling engine, highway partial return of exhaust gases into the combustion chamber of the Stirling engine, a pump in the system of external heat, providing the coolant flows successively through the heat exchanger and heating the heat exchanger of heat of exhaust gas as a domestic fuel can be wood, peat and oil shale.

The introduction of the cogeneration unit with Stirling engine at the local fuel gas generator for the production of generator gas and highways partial return of exhaust gases into the combustion chamber of the Stirling engine, allows to obtain a new property, which you can use for Stirling different types of local fuel, increasing the durability of the combustion chamber and heater motor is the determinant of Stirling by reducing the temperature of combustion gas from the gas generator due to supply into the combustion chamber of exhaust gases.

The drawing shows a cogeneration unit with Stirling engine on domestic fuel.

Cogeneration unit with Stirling engine on domestic fuel includes the Stirling engine 1 and generator 2 on the same shaft, the cooling system 3 of the Stirling engine 1, having in its composition a pump 4 and a heat exchanger-cooler 5 through which the supply line to the air 6, system 7 external heating with heat exchanger-a heat exchanger exhaust gas 8, a pump 9, a heat consumer 10 and the heat exchanger preheating 11, through which the external heat supply 7 is connected with the cooling system of the Stirling engine 3, line flue gas 12, the gas generator 13, ensuring the production of producer gas from different types of local fuel line gas generator 14, which connects the gas generator 13 with the combustion chamber 15 of the Stirling engine 1 and the line partial return of exhaust gases 16 valve 17. The engine cooling system 3 passes through the refrigerator of Stirling engine 18.

Cogeneration unit with Stirling engine on domestic fuel works as follows.

During operation of the Stirling engine 1 produces useful energy that is converted into electrical energy using power is enerator 2, located on the same shaft with the engine 1. For cooling the engine 1 in the refrigerator 18 from the cooling system 3 is supplied coolant. After the engine 1, the heated coolant from the cooler 18 by a pump 4 flows into the heat exchanger preheating 11, which transfers part of the heat to the coolant system of an external heat supply 7. Then the coolant flows into the heat exchanger-cooler 5 where it is cooled to the ambient temperature due to heat exchange with air entering through line air supply 6, and is returned to the refrigerator 18.

To ensure operation of the Stirling engine 1 from the gas generator 13, where the gasification of solid fuel (wood, peat, agricultural waste etc), through line 14 is fed into the combustion chamber 15 and producer gas. For his burning through line 6 is supplied with preheated air. Exhaust gases from the combustion chamber 15 through line 12 are fed into the heat exchanger of heat of exhaust gas 8, which transfer their heat to the coolant system of an external heat supply 7. From heat exchanger-heat exchanger exhaust gas 8 hot coolant is delivered to consumers warmth 10, which gives off heat, and then flows into the heat exchanger preheating 11, where it is partially heated by the t of the coolant of the cooling system 3 of the Stirling engine 1. The circulation of coolant in systems external heat supply 7 is accomplished by a pump 9.

To improve resource of the Stirling engine 1 and increase the durability of the combustion chamber 15, a portion of exhaust gases through line 16 back into the combustion chamber 15, which reduces the temperature of combustion of a mixture of producer gas and air. To regulate the flow of exhaust gases into the combustion chamber 15 on highway 16 is the control valve 17.

Sources of information taken into account when drawing up the proposal

1. Grider, Choper. Stirling Engines. M.: Izd. Mir, 1986, p.55.

2. Tagaev DL the Use of local fuels. Leningrad, 1940, p.14-21.

3. Leontiev, A., Panikov NV, Smolyakov A.F. Receipt and use of gaseous fuels from wood waste. Browse infirm. - M: Was, VIP, 1986. - 24 S.

4. RF patent №2196243, bull. No. 1 dated 10.01.2003 prototype.

Cogeneration unit with Stirling engine on domestic fuel, comprising a Stirling engine with generator on the same shaft, the cooling system of the Stirling engine, having in its composition a pump and a heat exchanger-cooler, through which the supply line to the air, a system of external heating with heat exchanger-a heat exchanger for exhaust gases, Teploobmennik is preheating, through which the external heat supply is connected with the cooling system of the Stirling engine, and the line of exhaust gases, characterized in that it is equipped with a generator, ensuring the production of producer gas from different types of local fuel, generator gas line connecting the generator with a combustion chamber of the Stirling engine, highway partial return of exhaust gases into the combustion chamber of the Stirling engine, a pump in the system of external heat, providing the coolant flows successively through the heat exchanger preheating and the heat exchanger of heat of exhaust gas as a domestic fuel can be wood, peat and oil shale.



 

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