SU836373A2 - Steam turbine regeneration system - Google Patents

Description

(54) STEAM TURBINE REGENERATION SYSTEM

I

The invention relates to the field of power engineering, in particular to steam turbine reclamation systems, mainly used in thermal and nuclear power plants, and is an improvement of the regeneration system according to the author. St. No. 600314.

Basically auth. St. No. 600314 describes a regeneration system comprising surface and mixing type heaters connected to a steam turbine extraction, condensate and feed pumps connected by water through a main condensate line 1. In this system, a mixing type heater installed in front of the feed pump is connected to an external steam source and to the discharge pipes of the feed pump and its condensate pumps.

The disadvantage of this system is low reliability. For example, when the power is turned off, the pressure pump is switched off, draining the condensate from the mixing preheater, and this leads to a shutdown of the feed pump. This is unacceptable for nuclear power plants, especially with RBMK reactors, according to the operating conditions of the reactor.

The purpose of the invention is to increase the reliability of the system.

This is achieved by the fact that the system is equipped with a water tank with a heater connected via water to the line at the inlet of the feed pump with a pipeline with a check valve, and a couple to the high-pressure surface heater.

This will allow water to be supplied to the feed pump inlet in the event of a condensate pump disconnecting.

The drawing schematically shows a steam turbine regeneration system.

The system comprises a mixing preheater 1, a low pressure surface preheater and high pressure surface preheaters 3 connected in series. The condensate pump 4c is installed directly downstream of the mixing preheater 1 and is intended for pumping water from it. Feed pump 5 is included in the main line 6 of the condensate. Pipeline 7 with a check valve 8 is designed to connect water tank 9 with line 6. Pipeline 10 with an electrified valve 11 connects tank 9 to line 12 of condensate heating

steam preheater 3 high pressure. The tank 9 is equipped with a heater 13 to maintain the temperature of the water in the tank at a predetermined level.

The system works as follows.

In the period of Euská from | valve 11 is burrowed and water tank 9 is filled with hot condensate from line 12; When the system is operating in the tank 9 with the help of the heater 13, the set water temperature is maintained and, accordingly, the pressure, which must be less than the pressure in the main condensate line 6. Therefore, the check valve 8 is normally in the closed position. In the case of stopping the condensate pump 4 due to the loss of its own needs, there is a drop in pressure in the line 6, the check valve 8 opens and the water from the tank 9 starts to flow into the line 6 to the inlet

pump 5. The supply of water in the tank 9 should be sufficient for the time sufficient to start the backup diesel generator and resume operation of the condensate pump 4.

Claims (1)

Invention Formula Steam turbine regeneration system according to auth. St. No. 600314, characterized in that in order to increase reliability, the system is equipped with a water tank with a heater connected via water to the line at the inlet of the feeder pump with a pipeline with a non-return valve and, according to hapy, to a high-pressure surface heater. .Information sources, taken into account during the examination 1. USSR Copyright Certificate No. 600314, N. CL. T01 K 7/40, 1974.