Heat and power installation

 

(57) Abstract:

Usage: in the field of energy for generating electricity by the heat of the flue gases of furnaces. The inventive system includes a heating surface, placed in a recovery boiler, steam turbine, condenser and a device for the circulation of the coolant, connected through pipes in a closed loop in the form of a thermosyphon and a generator of electric current. The impeller blades of the turbine, which is located inside the housing made of magnetic material and form pairs of poles of the permanent magnets. The turbine rotor simultaneously performs the functions of the rotor of the generator. The turbine housing is made of material transparent to electromagnetic waves around it is the stator of the generator. 2 Il.

The invention relates to the field of power engineering and can be used for electricity generation due to the heat of the exhaust gases of industrial furnaces and components.

Known thermal power plant, a simple thermal circuit which includes the boiler unit, steam turbine generator, condenser and pumps drain water from condensare high steam parameters (temperature and pressure), that greatly complicates the arrangement of the equipment of the station, aggravates it and makes it more expensive, requires significant energy consumption for own needs and the high cost of maintenance of the plants for the chemical treatment of feed water. To generate electricity due to low coolant parameters such power plant is unsuitable. When the low temperature of the flue gases of furnaces (200-300about(C) the possibility of obtaining satisfactory pair of parameters becomes problematic, and the traditional scheme of the station with the usual set of listed equipment is too cumbersome, which makes the electricity unprofitable. In addition, significant losses of the working fluid (steam and water) and, therefore, increased consumption of make-up water, and air inflows determine that the equipment is known thermal power plants subject to a number of "ailments" (oxygen and carbon dioxide corrosion of the metal salt deposits in the superheater and the flowing part of the turbine) that reduce their reliability and efficiency.

Closest to the technical essence and the achieved results to the invention is heat in the m having a rotor and a stator, a condenser and a device for feeding the condensed working fluid in the boiler, while the turbine is performed with the rotor blades placed on the shaft and positioned in the housing, connected to the system, its input and output.

A disadvantage of the known technological solutions is the need for a mechanical connection of the rotor shaft of a steam turbine, located in the internal space of the closed-loop system with the rotor shaft of the generator, located outside of this space. As the ideal seal for a rotating shaft does not exist, the known installation will be leakage of steam through the turbine shaft seal, which requires periodic replenishment of its working body.

The aim of the invention is to increase the efficiency of heat and power installation by eliminating leakage of the working fluid in place of the output shaft of the turbine housing for the coupling of the rotor of the generator.

This objective is achieved in that in the heat and power facility containing combined in a closed system HRSG, steam turbine with an electric generator having a rotor and a stator, the condensate of the rotor blades, placed on the shaft and positioned in the housing, connected to the system with its input and output, turbine made zuzelo with a generator, the rotor of the generator is made in the form of a turbine shaft with the placement of the last blades, made of magnetic material and mounted on the shaft with the formation of pairs of poles of the permanent magnets, the turbine housing is made in the form of a closed hermetic shell of a material permeable to electromagnetic waves, and the stator of the generator is made of steel plates with coils of copper wire placed around the casing of the turbine.

In Fig.1 shows a schematic diagram of thermal power plant; Fig.2 - section a-a in Fig.1.

Thermal power plant comprises a boiler 1, which includes the evaporator 2 and superheating 3 part of the heating surface, is placed in the flue gas from the kiln (not shown), the steam line 4, a steam turbine 5, a plot of the housing 6 of the turbine, made of a material permeable to electromagnetic waves, the stator 7 of the generator, condenser 8, condenser 9 with non-return valve 10, the condensate pump 11, is made in the form of Hermonassa, working the CSOs, the boiler 1 is equipped with a bypass duct 15 and a valve 16 gases. The blades 17 of the impeller 18 and the turbine 5 is made of magnetic material and form pairs of poles of the permanent magnets, the number of pairs of poles (blades) may be different. The shaft 19 of the turbine, the impeller 18 and the blades 17 to form the rotor of the turbine and generator at the same time.

Thermal power plant works as follows.

In the assembled heat scheme is filled with the calculated amount of liquid, for example water, and then she pumped the air and she carefully sealed (sealed). If necessary, the scheme of the installation can be equipped with a vacuum pump. Start installation is smooth, transfer the hot flue gases from the bypass duct 15 in the boiler 1 through the rotation of the distributor 16 from the extreme right position in some intermediate. In this part of hot gases from the kiln will begin to flow through the boiler 1 and to heat the working fluid (water) in the evaporating section 2 of the heating surface. Formed in the liquid boiling steam enters the superheater section 3 and further in the steam line 4 odnovremenno with the early warm-up of the turbine to the condenser 8 serves cold water or other cooling agent. As the warm turbine 5 of the steam, its temperature and pressure increase with the distributor 16 flue gases up until the turbine shaft will not gain the speed necessary to achieve the specified frequency electric current in the power system, and then perform a synchronization operation and enable the generator to the network. After turning on the electric power grid of the valve 16 the gases pass to the left, causing the generator to reach maximum load and works in basic mode until you stop the kiln is the source of heat for the boiler. Necessary for the operation of the turbine 5, the pressure differential pair is achieved by operation of the jet compressor (pump), the working nozzle 12 which is connected to the tap 13 of the steam line 4, and the camera rarefaction 14 to the condenser 9. In this part of the heat of superheated steam is converted into pressure energy of the condensate before the recovery boiler, the value of which may be significantly higher than the steam pressure before the nozzle 12 (Thermal and nuclear power stations. Directory./Under the General editorship of C. A. Grigoriev and C. M. Zorin. M: Energoizdat, 1982, S. 526, Fig. 7.40.

And the power setup allows you to completely eliminate leakage of the working fluid through the shaft seal of the pump, and if the pump drive steam, and through the seal of the turbine drive. In addition, the saved portion of the generated electricity or steam (steam drive), necessary to drive the feed pump.

The pressure drop is also affected by the height of the liquid column before the recovery boiler and the condenser. The depth of the vacuum after the turbine 5 is provided by the effective operation of the condenser 8, the tube which continuously served chilled circulating water. The condensate collects in the lower part of the condenser and the condensate flows down, where the hydrostatic pressure increases the jet pump.

When the movement of steam flowing through the portion of the turbine 5 of its potential and kinetic energy is converted into mechanical energy of rotation of the turbine rotor. Due to the permanent magnets are formed in pairs blades 17, there is a rotating magnetic field that penetrates through the housing 6 of the turbine and generating an electric current in the windings of the stator 7 of the generator. Thus the mechanical energy of rotation of the turbine rotor 5 is converted into electrical energy. The result of combining the functions of the turbine rotor and the rotor of the electric generator and the placement of the shaft 19 of Timoti feed.

HEAT and power installation comprising a joint in a closed system HRSG, steam turbine with an electric generator having a rotor and a stator, a condenser and a device for feeding the condensed working fluid in the boiler, while the turbine is performed with the rotor blades placed on the shaft and positioned in the housing, connected to the system with its input and output, characterized in that, to improve efficiency, turbine made zuzelo with a generator, the rotor of the generator is made in the form of a turbine shaft with the placement of the last blades, made of magnetic material and mounted on the shaft with the formation of pairs of poles of the permanent magnets, the turbine housing is made in the form of a closed hermetic shell of a material permeable to electromagnetic waves, and the stator of the generator is made of steel plates with coils of copper wire placed around the casing of the turbine.

 

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FIELD: power engineering; steam turbines.

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