SU1760135A1 - Peak-load power plant - Google Patents

Abstract

Use: energy, design, construction and reconstruction of thermal and nuclear power plants. SUMMARY OF THE INVENTION: Heat accumulation during hours of failure is carried out in water by repeatedly pumping the entire volume of condensate from the cold condensate tank 19 through the deaeration column 18 in the hot water accumulator 17, while simultaneously heating the latter with steam from turbine selections or reduced by steam generator 1 1 hp f-ly, 1 ill.

Description

The invention relates to the field of energy and can be used in the design, construction and reconstruction of thermal and nuclear power plants.

The purpose of the invention is to increase the efficiency of the power plant.

This goal is achieved by the fact that a peak power plant including a steam generator, a steam turbine with a condenser, a condensate pump, high and low pressure regenerative heaters, a deaerator with a feed pump, and a hot water accumulator connected via a reduction cooling unit to its inlet. to the steam outlet from the steam generator, and through the pump to the circuit in front of the high-pressure heaters, is additionally equipped with a water-jet ejector placed in the loop between the feed pump and E revatel high pressure inlet and attached on the ejected medium to the outlet of the pump accumulator of hot water, the latter being adapted

a deaerating column integrated inside it, and a reduction-cooling installation is made multi-stage as a set of reduction devices interconnected in parallel, and having a reduction-cooling device at the inlet.

The thermal scheme of the peak power plant (see drawing) includes a steam generator 1, high pressure cylinders (HPCs) 2 and low pressure cylinders (LPCs) 3 of a steam turbine of a turbine unit 4. In addition, the thermal circuit of the power plant includes condensers 5. condensate pump 6, low pressure heaters (PND) 7, deaerator 8, feed pump 9 and high-pressure heaters 10 with pipe 11 for steam extraction from the turbine.

The thermal scheme of the peak power plant includes a multistage reduction-cooling installation 12, comprising a set of reduction devices 13 and 14 and a valve 15 interconnected in parallel, and having a reduction-cooling device at the input

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CTDO 16. The heat circuit also includes a hot water accumulator 17 with a de-aeration column 18 built into it, a cold condensate tank 19, a water-jet ejector 20, pumps 21, 22 and 23, valves 24, 25, 26, 27 and 28,

Peak power station works as follows.

When the steam power plant (HES or NPP) operates in the basic mode, steam from the steam generator 1 enters the high pressure cylinders (CVPs) 2, and then the low pressure cylinders (LPCs) 3 of the steam turbine of the turbine unit 4. The exhaust steam enters the condensers 5, and condensate by condensate pump 6 through low pressure heaters (HDPE) 7 is fed to deaerator 8. Deaerator 8 also receives the addition of chemically purified water and, after separation from the resulting mixture of gases dissolved in water, feeds 9 st pressure (LDPE) 10, the feed water supplied to the steam generator 1.

Condensate heating in HDPE 7 and feed water in LDPE 10 is carried out with steam taken from the turbine in the form of bleedings 11. Steam is taken from the turbine for deaeration needs.

When the hours of failure of heat and electric load arrive, it is necessary to reduce the supply of heat and electric energy to consumers, while leaving the work of the steam generator in the basis. For this purpose, the valve 24 is opened and part of the steam from the steam generator 1 enters the reduction-cooling installation 12. At this time, the pump 23 is turned on, the valve 28 is opened and cold water 17 is pumped into the hot water accumulator 17 The condensate passes through an additional deaeration column 18, which is embedded in the upper part of the battery 17. The deaeration column also supplies steam throttled first to DOC 16 and then to the reduction unit RU 13 (or from turbine selections). The condensate (feed water) passing the mixing preheater-deaeration column 18 receives the first preheating, gases are removed from it, and it accumulates in the hot water accumulator 17.

When the battery is filled to the design level, the pump 23 is turned off, the valve 28 is closed, the valve 27 is opened and the pump 21 is turned on. At the same time, the switch on switch 13 is turned off, the switch on switch (RU) 14 is turned on. temperature than after

RU 13, Pump 21 begins to pump the already heated feed water, taking it from the bottom of the storage tank through the funnel and again feeding it to the deaeration column 18.

In this case, the water is heated again and the removal of gases continues.

After the entire volume of water in the accumulator has been pumped, the switchgear 14 is closed (or the corresponding discharge from the turbine) and the valve 15 is opened. Steam begins to flow into the degassing column with the pressure for which the hot water accumulator is designed , and pump 21 continues to operate until

5 again, the entire volume of water in the battery will not be pumped through. After that, the pump 21 is turned off, and the valve 27 is closed, thus ending the process of heat accumulation. Heat accumulation process

0 is calculated in time in such a way that it is completed by the beginning of the peak load in the power system, and the intensity of this process and the method of steam supply (via DOC, or turbine sampling) is determined5 with the failed power system power.

When there is a need for additional electrical energy, the circuit operates as follows. Include

0 pump21. Open the slide 25. the auxiliary booster pump 22 is turned on, the valve 26 is opened and the water is overheated and begins to flow into the ejector 20, mixing in it with the power feed water supplied by the feed pump 9.

The feed water is supplied to the LDPE 10, depending on the required peak power of different initial temperatures. Men ratio in the ejector

0 between the expenses of the ejecting power feedwater after the pump 9 and the injected overheated water from the accumulator 17 of the increased pressure (after the booster pump 22), in the ejector get the required

5 feed water temperature at the entrance to the LDPE and, as a consequence, the required additional peak power of the turbine unit due to the reduction of steam extraction from the turbine to the LDPE, the standard deaerator, and

0 PND.

The change in the ratio between the water being ejected and the ejecting water and, thus, temperature control is carried out using the characteristic

5, for example. By reducing the feedwater flow, for example, the pressure developed by the feed pump is increased, and thus, the ejected component of hot water from the accumulator is increased and vice versa. An additional adjustment of the ratio of feed and overheated water consumption is made by changing the position of the nozzle in the adjustable ejector. Excess condensate is discharged into the cold condensate tank.

Claims (2)

Claim 1. Pikov power plant, including a steam generator placed in a closed loop, a steam turbine with a condenser, a condensate pump, high and low pressure regenerative heaters, a deaerator with a feed pump, and a hot water accumulator connected via a reduction cooling port with its input installation to the steam outlet of the steam generator, and the output0 house through the pump to the circuit in front of the high pressure heaters, from the pump so that, in order to increase efficiency, it is additionally equipped with a water jet ejector placed in the circuit between the feed pump and the high pressure heaters and the connected inlet on the ejected medium to the outlet of the pump of the accumulator of hot water, at the same time the accumulator is made with a deaeration column integrated at the inlet. 2. Power plants according to claim 1, which means that the reduction-cooling unit is a multistage unit as a set of reduction devices connected in parallel. Abnormal reset  Hondems / pp stock tank