SU1101567A1 - Method of regulating load of heat-electric generating plant - Google Patents

Abstract

METHOD OF REGULATING THE LOAD OF THE HEAT RECOVERY ELECTRIC POWER STATION by supplying fuel to power and peak water pits, generating steam in power boilers, supplying steam to turbines, sequentially heating network water in preheaters fed with steam of different pressures from turbine selections, and to peak water heating boilers, and heating peaks of various turbine selections and peak water heating boilers. that, in order to increase the efficiency in the maximum load mode of the electric load in the case of using heat and back-pressure turbines, reduce the fuel supply while the peak boilers while increasing supply (flow rate) of fuel in the power generation boilers and the additional amount of steam fed into the last backpressure turbine with an exhaust steam which is fed on the heating-system water.

Description

The invention relates to a power system and can be used in thermal power plants (thermal power plants - hydroelectric power plants) with counter-pressure turbines.

The known method of regulating the load of the heat and power plant by increasing the pass of steam through the turbine to the condenser, preheating the water that accumulates in the storage tank in the latter, and during the period of reducing the load is fed to water treatment 1.

The disadvantages of this method are the need to install storage tanks and reduce efficiency due to obtaining additional (peak) electrical load (power) in the condensation mode.

There is also known a method for regulating the load of a heat and power plant by supplying fuel to power and peak boilers, generating steam in power boilers, supplying steam to turbines, sequentially heating network water in preheaters fed with steam of various pressures from turbine selections, and in peak water-heating boilers 2 .

The disadvantages of this method are the use of high-potential steam from turbine selections, along with expensive fuel, to reheat water in peak boilers, as well as to obtain additional load on the condensation mode, which reduces the efficiency of the power plant during the period of increased load ).

The purpose of the invention is to increase the efficiency in the mode of maximum electrical load in the case of using heat suppression turbines.

This goal is achieved in that according to the method of load control of a cogeneration power plant by supplying fuel to energy and peak water boilers, generating steam in power boilers, supplying steam to turbines, sequentially heating network water in heaters fed with steam of various pressures from turbine selections, and in peak hot-water boilers, reduce the supply of fuel to peak hot-water boilers with a simultaneous increase in the supply (consumption) of fuel to power boilers and the generation of additional A considerable amount of steam is supplied by the latter to the back pressure turbine, from the exhaust of which the steam is directed to the heating of the supply water.

The drawing shows a schematic diagram of a TPP with two turbines, on which this method is implemented.

TPP contains heat and back pressure turbines 1 and 2 with generators 3 and 4, connected by pipelines 5 and 6 of fresh steam to the power plant.

boiler (koltam) 7, equipped with a pipeline 8 of the fuel supply. The steam extraction pipelines 9 and 10 of the cogeneration turbine 1 are connected to the network heaters 11 and 12, after which the peak water boiler 13 is connected in series with the fuel supply pipe 14, and the latter is connected by a jumper 15 to the fuel supply pipe 8 of the power boiler 7 or specially installed burner (not shown). The pipe 16 of the steam extraction back pressure turbine 2 is connected to the pipe, wire 17 additional (peak) heater 18 network water, which can be placed behind the peak boiler 13 or between the latter and the network heater 11. The pipe 16 is connected by a jumper 19 with pipe 9 and 10 of the selection cogeneration steam turbine or with network heaters 11

and 12. Highway 20 and 21 of the return network water are connected to the collector 22, and highways 23 and 24 of the direct network water are connected to the collector 25. Turbines 1 and 2 are equipped with regulators 26-28.

The method of controlling the load of the heat-generating power plant is carried out as follows.

If it is necessary to increase the electrical load, the fuel supply to the peak boiler 13 is gradually reduced, transferring this amount of fuel equal to the amount of reduction in the bridge 15 to the energy boiler 7. The reduction in fuel supply can be made on several peak heating boilers 13, up to complete cessation of fuel supply to one or several boilers 13. It is possible to supply this amount of fuel proportional to the required increase in electrical load for several energy sources. boilers 7, in which, as a rule, more fiery fuel is burned than at peak water boilers 13, and the supply of fuel to peak water boilers 13 improves the combustion conditions of the fuel of energy boilers 7. The additional steam produced in the energy boiler 7 (additional steam) is supplied to back pressure turbine 2. If back pressure turbine 2 is stopped, it starts up (additional steam is supplied, the rotor speed increases, the generator 4 is synchronized and the grid is turned on, increasing electric load in accordance with the increase of the peak to the required value). Steam from the discharge pipe 16 is supplied to the heated water

to the required temperature. This heating can be performed in the additional (peak) heater 18 of the supply water or in the network heaters II and 12. In the latter case, steam extraction to the network heaters I and 12 will be reduced or terminated and additional power will be obtained at the cogeneration turbine 1.

Since heat (fuel) from peak water-heating boilers 13 is transferred to the back-pressure turbine 2, where only part of it is spent on generating facial (additional) electrical load, and the rest is used to heat supply water, heat replenishment to produce additional load (heating network power ) can be provided by the additional supply of fuel peak water boilers 13 to the power boilers 7. The amount of this fuel (in heat) should be proportional to the amount of replenishment the cost of fuel (heat) to generate additional electrical load produced by

reducing the supply of fuel to peak water boilers 13. This heat replacement can be obtained by overloading. Thus, the transfer of other fuels to power boilers improves the conditions for fuel burning and efficiency in them, and the supply of additional steam to the back-pressure turbine allows for an additional (peak) electrical load on the heating plant.

graphics with a constant supply of heat to the consumer, which increases the efficiency and maneuverability of the power plant. If necessary, additional electrical load can be obtained at the cogeneration turbines by reducing

selection of steam for network and regenerative heaters when replacing this steam (heat) with steam from the back-pressure turbine.

Claims (1)

METHOD FOR REGULATING THE LOAD OF HEAT POWER PLANT by supplying fuel to energy and peak hot water pits, generating steam in energy boilers, supplying steam to turbines, sequential heating of network water in heaters fed by steam of different pressures from turbine offsets, and in peak water heating boilers, different the fact that, in order to increase efficiency in the maximum electric load mode in the case of using cogeneration and backpressure turbines, they reduce the fuel supply to pi marketing boilers while increasing supply (flow rate) of fuel in the power generation boilers and the additional amount of steam fed into the last backpressure turbine, with which the exhaust steam sent to the heating-system water. §