SU1320462A1 - Power plant - Google Patents

Abstract

The invention relates to a power system and allows for greater efficiency and lower capital costs. The inlet and outlet of the heated medium of the heat exchanger 17, which is made superficial, communicate with each other via a bypass line 27 in which a check valve 28 is installed. The inlet of the heat exchanger 17 is connected to its outlet along the feedwater of the high pressure preheater (LDPE) 14. To the steam line LDPE 14 is removed; steam space 22 of battery 21 is connected. As a result of mixing feedwater flows from LDPE 14 and hot water from battery 21, the water temperature at the inlet to steam generator 1 increases and correspondingly but its steam production increases. Due to an increase in the steam generation capacity of the steam generator 1 and a decrease in the values of turbine extraction for regeneration, due to a decrease in the flow of water through the regeneration path 10, the capacity of the turbogenerator increases. 1 il. sl 00 ts :) about 4; about to

Description

The invention relates to a power system and can be used in power plants.

The aim of the invention is to increase the economy and reduce capital costs.

The drawing shows the scheme of the proposed power plant.

The power plant comprises a steam generator 1 connected by a steam line 2 to a high-pressure cylinder 3 (HPC) of the turbine, the output of which is through the separator 4, the first and second stages 5 and b of the intermediate superheater connected to the low-pressure cylinder 7 of the turbine. The output of the low-pressure cylinder 7 of the turbine through the condenser 8, the condensate pump 9, the path 10 of condensate and feed water, including a group of low pressure preheaters 11, a deaerator 12, a feed pump 13 and high pressure preheaters 14, are connected to the steam generator 1 entrance. 6 of the intermediate superheater is connected to the hot steam pipeline 2, and the outlet is connected by a condensate discharge line 15 to an input of the heating medium of the last high pressure preheater 14.

The steam line 2 is communicated through the valve 16 to the inlet through the heating medium of the charge heat exchanger 17, whose outlet through the heating medium is connected to the condensate discharge line 15 of step 6 of the intermediate superheater.

The output of the latter high-pressure feedwater heater 14 is connected through a heated heat exchange surface of the charging heat exchanger 17, valve 18 and pump 19 to the water space 20 of the hot water accumulator 21 (AGW), the steam space 22 of which is connected via a pressure reducing valve 23 to the pipeline 2 hot steam, and through control valve 24, line 25, to steam turbine selection pipe 26 to the last high pressure preheater 14. The input and output of the charge heat exchanger 17 in the heated medium are interconnected by a bypass line 27 with the check valve 28 installed on it, the inlet of the pump 19 of the battery 21 and the output for the heated medium of the charge heat exchanger 17 are connected by a bypass line 29 to the valve 30 installed on it. The discharge port of the condensate pump 9 is connected through a valve 31 to a cold condensate tank 32 connected via a pump 33, a valve 34 to a condensate inlet of a low-pressure heaters 11 group.

The installation works as follows.

In the nominal mode, the steam produced by the steam generator 1 is fed through a pipeline 2 of hot steam to the inlet of the cylinder 3 of the high pressure turbine, where, if it is expanded, it performs work, after

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energy. From the outlet of the high pressure cylinder 3, the wet steam is separated in the separator 4, superheated in steps 5 and 6 of the intermediate superheater and fed to the inlet of the cylinder 7 of the low pressure turbine, where, expanding, it does useful work. The exhaust steam is condensed in condenser 8, from where condensate is pumped by condensate pump 9 into path 10 and passes through a group of low pressure heaters 11 to deaerator 12, from where feed water is supplied by feed pump 13 through high pressure heaters 14 to steam generator 1 inlet. Valves 16, 18 and 30, 31, 34, check and control valves 23 and 24 are closed, pumps 19 and 33 do not work.

During the period of failure of the electrical load at the inlet of the path 10, the pump 33, through the open valve 34, supplies an additional amount of cold water from the cold condensate tank 32. The additional feedwater flow thus obtained passes through the whole regeneration feedwater path 10 and from the outlet of the last high pressure preheater 14 is pumped through the heated surface of the charge heat exchanger 17 and the open valve 30 to the accumulator 21, which is forced out of steam through the control valve 24 in the turbine extraction steam line 26 to the last high pressure preheater 14. A reduction in the power of the turbine unit is provided by increasing the values of the turbine sampling and withdrawing a part of the steam to heat the additional water flow directed to the accumulator 21.

The valves 18 and 31 and the check valve 28 are closed, the pump 19 is not working, the valve 16 is open.

During the peak electrical load at the input of the steam generator 1, pump 19 of battery 21 through hot valve 18 and open check valve 28 is supplied with hot water from battery 21. At the same time, water consumption through turbine feed water path 10 is reduced. Excess condensate from the condenser 8 is pumped by the condensate pump 9 through the open valve 31 into the cold condensate tank 32.

As a result of displacing the feed water stream from the outlet of the last preheater 14 of high pressure and hot water from AGW 21, which has a temperature higher than the feedwater temperature, the water temperature at the inlet to the steam generator 1 increases and, accordingly, the steam capacity of the steam generator 1 increases.

Thus, due to an increase in the steam generating capacity of the steam generator 1 and a decrease in the magnitude of the turbine regeneration screenings due to a decrease in the flow of water through the regeneration path 10, the power of the turbogenerator increases. The released volume of AGV 21 is filled with steam through a pressure reducing valve 23 from the steam line 2. The valves 16, 30 and 34 and the control valve 24 at the same time closed, the pump 33 is not working.

Claims (1)

Invention Formula A power plant containing a turbine, a feedwater path with high and low pressure heaters connected by a steam line to the turbine, a steam generator connected to the turbine by a steam pipe to which the steam space of the accumulator is connected. a torus of hot feedwater, and a charged heat exchanger connected to the feedwater path through a heated medium, the heating inlet of which is connected to a live steam pipeline, characterized in that, in order to increase efficiency and reduce capital costs, the charge heat exchanger is made superficial its input and output through the heated medium are communicated with each other via a bypass line with a non-return valve placed on it, and the heat exchanger input through the heated medium is connected to the output of the latter along the feed path minutes water high pressure preheater, to which is connected a steam line selection vapor space of the battery.