The method of regulation of electric power cogeneration combined-cycle plant with heat recovery boiler

 

The method of regulation of electric power cogeneration combined-cycle plant with heat recovery boiler includes closing the inlet guide vanes of a compressor of a gas turbine, a rotary diaphragm of the low pressure steam turbine, including peak network heater while reducing the electrical load and the opening of the inlet guide vanes of a compressor of a gas turbine, a rotary diaphragm of the low pressure steam turbine and stop peak network heater with increasing electrical load. When reducing the electrical load increases the vapor pressure in the selection of the turbine by-pass line heaters on the water and direct the main condensate in the deaerator, in addition to gas condensate preheater, which uses water-to-water heat exchanger and circulation pump is transferred to the heating system water. With increasing electrical load and reduce the steam pressure in the turbine selection, the main condensate is directed into the gas heater and restore the circuit of the heating network water network heaters steam turbine. The invention will increase the range of regulation of the electricity is E. 1 Il.

The invention relates to the production of electric and thermal energy and can be used for cogeneration combined-cycle plants with heat recovery boilers (PHOKU).

A known method of regulating the electrical power running graphics on thermal cogeneration steam turbine by reducing the consumption of steam in the condenser and the turbine while reducing the electrical load and the increased steam flow with increasing electrical load at rated selections couple on regenerative heaters and given the heat regulation of the steam pressure in the network heaters, which while reducing the electrical load-reduce steam extraction for regenerative heaters while increasing the vapor pressure in the network heaters to the maximum value, while increasing electrical load restore selections couple on regenerative heaters and the steam pressure in the network heaters to the nominal value (as of the USSR №1110912, IPC: F 01 K 17/02, and Bezlepkin B. N., Mikhailov S. J. "the Adjustment range of thermal power plants". HP: Energoatomizdat, 1990, S. 168).

The disadvantage is x advanced system regenerative feedwater heating, and have a wide range to vary the steam flow to the turbine. The cogeneration combined-cycle plants with heat recovery boilers almost no system of regenerative feedwater heating, and steam flow to the turbine is determined by a given heat load, therefore, the known method can be used only in combination with other methods.

The closest technical solution to the proposed method is a method of regulating the electrical power running graphics on thermal cogeneration combined-cycle plant with heat recovery boiler by closing the inlet guide vanes of a compressor of the gas turbine unit (GTU), closing the rotary diaphragm of the low pressure (PND) steam turbine and switching peak network heater while reducing the electrical load and the opening of the inlet guide vanes of the compressor of the gas turbine, the opening of the rotary aperture PND steam turbine and stop peak network heater with increasing electric load (d'yakov, A. F. and others "Cogeneration combined-cycle power plant in the North-West plant St. Petersburg. Static characteristics. Power station, 1996, No. 12, S. 9-15 - prototype).

The disadvantage of this method adopted for prototype conservation of heat energy at a given level must be included in the operation of hot-water boilers, peak network heaters fed with live steam through ROWE, etc. Need to get a significant portion of thermal energy from additional sources significantly increases the cost of installation and reduces its thermal efficiency.

The inventive solution allows to increase the range of regulation of electric power combined-cycle plant with heat recovery boiler while maintaining the heat capacity at a given level, as well as to improve the efficiency of its work.

A method for regulating electrical power cogeneration combined-cycle plant with heat recovery boiler by closing the inlet guide vanes of a compressor of the gas turbine unit (GTU), closing the rotary diaphragm of the low pressure (PND) steam turbines, switching peak network heater while reducing the electrical load and the opening of the inlet guide vanes of the compressor of the gas turbine, the opening of the rotary aperture PND steam turbine stop peak network heater with increasing electrical load, while reducing the electrical load increases the vapor pressure in the selection of the turbine by-pass line heaters on the water, the main condens is mennica and the circulation pump is transferred to the heating network water with an increase in electrical load and reduce the steam pressure in the turbine selection, the main condensate is directed into the gas heater and restore the circuit of the heating network water network heaters steam turbine.

The invention is illustrated in the drawing, which shows a principal heat flow diagram of the cogeneration combined-cycle plant with a heat recovery boiler for the implementation of the proposed method.

District heating PHOKU includes a gas turbine installation 1 reported by exhaust gases from the recovery boiler 2, which is a pair of high and low pressure communicated with a steam turbine 3. At the entrance to the compressor of the gas turbine 1 is input guide apparatus 4, and part of the low pressure steam turbine 3 is rotatable aperture PND 5. Steam turbine 3 pipelines connected to the network by the heater 6. Consistently with the network heaters 6 to the water network is connected, the peak network the heater 7. Network heaters 6, 7 condensate of the heating steam is connected with a gas heater 8 and the tank 9. For the perimeter network of the heaters 6, 7 to the water network has a bypass pipe 10. Condensate gas heater 8 via a water-to-water heat exchanger h by heating a pair of pipe low pressure steam 13.

The method of regulation of electric power cogeneration to PHOKU is as follows.

When reducing the electrical load close input guide apparatus of the compressor 4, closed rotary aperture PND 5, include the work of peak network the heater 7, increase the vapor pressure in the selection of the turbine by-pass line heaters 6, 7 via the bypass pipe 10, the condensate of the heating steam line heaters, in addition to the gas heater 8, is sent to the deaerator 9, gas heater 8 through the water-to-water heat exchanger 11 and the circulating pump 12 is transferred to the heating network water.

With increasing electrical load and open the guide apparatus of the compressor 4, open rotary aperture PND 5, off from the peak network heater 7, reduce the steam pressure in the turbine selection by disabling the bypass pipe 10, the main condensate is directed into the gas condensate preheater 8, restore scheme of heating network water network heaters steam turbine.

During the periods of lower electrical load when closed input guide apparatus 4, the flow rate of exhaust gases of the gas turbine decreases approximately thermal power installation, close the swivel aperture PND 5 and include in the work of peak network the heater 7. The rotary closure of the diaphragm accompanied by a reduction of steam flow through PND 5 and increase the final enthalpy of steam. The inclusion of peak network of heater 7 leads to a reduction of the flow to the turbine low pressure steam and to increase thermal power of the steam turbine 3. As a result of these actions the electrical power to PHOKU still somewhat reduced, and a heat capacity increases. Calculations determined that using accepted as the prototype of the method electric power to PHOKU can be reduced by 34%. However, thermal capacity of the unit when this will be reduced by 20%, which in most cases is unacceptable.

For further heat recovery unit capacity increase the vapor pressure in the selection of the turbine by-pass line heaters via the bypass pipe 10. The increase of steam pressure in the turbine selection 3 leads to the reduction of the available teleperedach and growth temperature of the condensate of the heating steam line heaters 6, 7. High temperature condensate allows you to send it directly to the deaerator 9, bypassing the condensate gas heater 8 is odes. This increases the flow rate of the heating steam in the deaerator 9 and accordingly decreases the consumption of low pressure steam to the turbine 3. As a result of these actions the electrical power to PHOKU continues to decline, and heat capacity increase.

The calculations showed that the proposed method of regulation of electric power combined-cycle power plant CCPP-450T allows in periods of lower electrical load to reduce electric power combined-cycle plants with heat recovery boilers 30% at constant heat capacity. This means that the adjustment setting range increases by 30%. When applying the described method of regulating the electrical power utilization of the heat fuel and thermal efficiency of PHOKU remain virtually unchanged.

Implementation of the proposed method of regulation of electric power does not require significant changes in thermal scheme of PHOKU and (or) the inclusion in its membership of additional equipment. The method is implemented practically without the financial and material costs. The calculations showed that the implementation of the proposed method of regulation of electric power to lign:center; margin-top:2mm;">Claims

The method of regulation of electric power cogeneration combined-cycle plant with heat recovery boiler by closing the inlet guide vanes of a compressor of a gas turbine, rotary closure diaphragm of the low pressure steam turbine, switching peak network heater while reducing the electrical load and the opening of the inlet guide vanes of a compressor of a gas turbine, the opening of the swing of the diaphragm of the low pressure steam turbine, stop peak network heater with increasing electric load, wherein when reducing the electrical load increases the vapor pressure in the selection of the turbine by-pass line heaters on the water, the main condensate is sent to the deaerator in gas condensate preheater, with the help of water-to-water heat exchanger and circulation pump is transferred to the heating network water, and with increasing electrical load and reduce the steam pressure in the turbine selection, the main condensate is directed into the gas heater and restore the circuit of the heating network water network heaters steam turbine.

 

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