SU1523688A1 - Method of operation of power-and-heat generating steam power plant - Google Patents

Abstract

The invention relates to heat and power engineering, can be used at heat and power plants and allows to increase the efficiency of operation and extend the control range of a steam turbine plant. The method of operation of the steam-turbine cogeneration plant includes cooling the return network water with raw water, dry cleaning and deaerating the raw water, accumulating deaerated water and mixing it with the main flow of the return network water. During the period of obtaining additional power, artificially increase the calculated flow rate of the network water through the grid heater, accumulate its excess part, which is used as feed for the heating network during the period of failure of the electric load. This makes it possible to increase the efficiency of the installation, to expand its adjustment range when operating according to the heat schedule, i.e. while maintaining the estimated heat supply of the consumer m. 1 Il.

Description

The invention relates to a power system and can be used at heat and power plants providing a heat supply system with an open water outlet, for hot water supply, and may be most effective at heat and power plants used to regulate the electrical load schedule in the power system while maintaining heat supply to consumers without disturbing the temperature graphics.

The aim of the invention is to increase the efficiency and expansion of the regulation: range of the steam turbine plant.

 The drawing shows a steam-turbine plant.

The installation includes a turbine 1, in the condenser 2 of which a built-in bundle 3 is placed, connected through a water heat exchanger 4 and a dry cleaning 5 with a vacuum deaerator 6, a network heater 7 with a direct network supply line 8 and a return network supply line 9, on which A water-to-water heat exchanger 4 was installed, a deaerated water supply tank 10 connected through valves 11 to line 9, and a hot water storage tank 12 connected through valves 13 to network 8 nPHMOJi network water and through valves 14 to the line 9 reverse network th water. The steam turbine plant contains pumps 15-18 and valves 19-25.

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The method is carried out as follows.

Steam from turbine 1 running with minimal steam flow to condenser 2 is sent to mains heater 7, where mains water supplied by pumps is heated directly or through a peak hot-water boiler (not shown) to line 8 of the mains water. Heating of the network water in the peak hot-water boiler is carried out as usual when the temperature of the network water at the outlet of the network heater 7 is lower than the value required by the temperature schedule of the heating load. Raw water to feed the heat network and ignite internal losses, preheated in the embedded beam 3, is directed to a water-cooled heat exchanger 4, through which all the reverse network water passes or its. part. Next, the raw water is directed to the dry cleaning 5, from where a part of it intended to feed the heating network is sent to a vacuum deaerator 6 to feed the heating network and then pumps 18 to the tank 10 of the deaerated water supply. In order to obtain additional power, the backwaters 11 and deaerated water are opened by pumps 17 from the tank 10 of the deaerated water reserve in an amount exceeding the required flow rate to feed the heating network, are fed to the backflow main line 9, to the network heater 7, then through the open backboards: An excess amount of hot water is directed to the hot water storage tank 12, and the calculated amount of utility water after the peak hot water boiler is directed along. Highway 8 direct network water to the consumer.

As a result, heightened vs. estimated consumption of network water

five

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cutting the main network heater 7 reduces its temperature at the outlet of the network heater 7 and increases the capacity of the installation.

During the period of failure of the electric load, the valves 11 and 13 close, open the valves 14, and the hot water accumulated in the storage tank 12 during the period of obtaining additional power, with the pumps 16 in the amount necessary to feed the heating network, is fed to the trunk 9 reverse network water. In the summer, valves 19, 20 and 25 are closed, and valves 21 are open. Additional power is obtained by the method described, and during the period of failure the valves 11 and 13 are closed, the valves 14 are opened, hot water from the tank 12 is fed to the return network water line 9, and from there along the bypass line of the network heater 7, gate valves 23 and 24 are closed, and gate valves 22 are opened, - to main 8, straight network water

and to the consumer, i

Claims (1)

Invention Formula The method of operation of the steam-turbine cogeneration unit by cooling the return network water with raw water, dry cleaning and deaeration of the latter, accumulating the deaerated water and mixing it with the main stream of deaerated network water, characterized in that, to increase the efficiency of the steam turbine installation, during the period of maximum electrical load, the flow of mains water is increased, its part is accumulated after the mains preheater, which is used to feed the heating network Minimum electrical load iodine.