SU1490307A1 - Method of producing heat-and-power plant - Google Patents

Abstract

The invention relates to a power system and makes it possible to increase the efficiency and maneuverability of the operation of a heat and power plant when obtaining peak (additional) power. To do this, at the maximum allowable steam flow to the high pressure cylinders and part of the average pressure of turbines (turbines) and given heat release to consumers from industrial and heating outlets, turn off the steam supply to the high pressure preheaters and supply the resulting excess steam from the high cylinder exhaust (cylinder) pressure on the heating network water. At the same time, the steam consumption to the low pressure part is increased, and the set temperature of the supply water is maintained by controlling the steam flow rate from the heating sampling. 1 il.

Description

The invention relates to a power system and can be used at combined heat and power plants (CHP) to obtain peak (additional) power.

The purpose of the invention is to increase the efficiency and maneuverability of the CHP operation in obtaining additional power.

The drawing shows a schematic diagram of the CHP for the implementation of the proposed method.

The steam line 1 of fresh steam is connected to high pressure 2 and 3 high pressure (HPC) turbines of type CT and P, respectively. CVPs 2 and 3 are connected to the manifold at the outlet (steam pipeline 4 of the production steam, CVP 2 is connected to part 5 of the average pressure

(CHSD), which through the regulating device (PG) 6 is connected to the low pressure part 7 (PND) communicated with the condenser 8. To the pipelines 9 and 10 of the steam extraction from the HPC 2 through the backup device (memory) II and 12 High-pressure regenerative heaters 13 and 14 (LDPE) are connected, and pipelines 15 and 16 of steam extraction from HPC 3 through YAH 17 and 18 - HPC 19 and 20, included in feed water path 31. CVPs 13 and 14 are included in feedwater path 22. In the path 23 of the network water, the main network heater (OP) 24 connected to the heating plant heating water 25 and the network heating peak heater 26 (CC) 26 connected to

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through the locking and regulating device (ERA) 27 to the collector 4 of production steam, communicated by pipelines 28 and 29 of the production steam extraction from the HPC 2 and 3. The temperature sensor 3 is installed on the pipeline 30 and 30 direct supply water ( DT), associated with RU 6, and on-collector A - pressure sensor 32 (DC). CVP 3 and PND 7 are connected to generators 33 and 34. The collector 4 is connected by pipelines 35 and 36 with consumers (not shown) of the heat of production withdrawals, for example, a production consumer for own needs of CHP. The consumer is not shown the heat of heating sampling is connected with the pipeline 30 straight network water

If it is necessary to obtain peak (additional) power at maximum steam consumption in HPC 2 and 3 and in CHSD 5, a pair of ATS 13 14.19 and 20 (or on one of the turbines of type PT and P) is turned off by closing the memory 11, 12 , 17 and 18. This increases the pressure in the manifold 4 and DD 32 gives a pulse to the opening of the closed switchgear 27 and RU 6 V - these conditions increase the steam consumption in PND 7 and condenser 8 and the vapor pressure decreases in the heating selection pipe 25 and OP 24, which leads to an increase in power generated in PND 7, due to the increase in steam consumption in it, and 5, in view of the decrease in vapor pressure over the CHC 5, and therefore, the increase in the thermal differential. All this leads to an increase in electrical energy 4ecKofi produced by geyeratoramch 33 and 34. At the same time, the flow temperature of the net water at the outlet H: I on 24 decreases, which allows an increase in the amount of heat transferred by the setez water to PP 26, due to nutrient water in the paths 21 and 22. The temperature of the supply water after PP 26 is maintained at a predetermined value

with the help of DT 31, which acts on the switchgear 6, thereby regulating the pressure in the pipe 25 of the CHSD 5 selection heater and the heat supply to the OP 24. With a given heat release, the consumer from the production and heating selections of steam generates peak power. You can increase the consumption of heat to the consumer of production selection or for own needs of CHP, if you reduce the degree of opening of switchgear 27 and RU 6, as well as raise the temperature of the supply water after PP 26 by reducing the degree of opening of RU 6 and increasing the opening. LRU 27. At the same time, the heat of peak water-heating boilers (not shown), if they were in operation, can be ousted, with a certain decrease in the value of the additional power obtained.

Claims (1)

Invention Formula The method of obtaining peak power at combined heat and power plants by disconnecting high-pressure turbine heaters at a given heat output to consumers from industrial and heating selections from high-pressure cylinders and medium-pressure parts, increasing steam flow to a low-pressure part and maintaining that, in order to increase efficiency and maneuverability, the shutdown of the high-pressure heaters is performed by a couple of times when the maximum is reached The high steam flow rate into the high-pressure cylinders and part of the medium pressure, and the excess steam flow after the high-pressure cylinders are fed to the heating of the supply water, maintaining its temperature setpoint by varying the steam flow rate from the heating samples. 50 31 1 |