SU920240A1 - Straight-flow steam generator power unit separating circuit - Google Patents

Description

(54) RUNNING PLAN OF POWER UNITS WITH DIRECT-CURRENT STEAM GENERATORS

one

This invention relates to a power system and can be used when starting up power units with continuous flow steam generators.

A known starting circuit of power units with continuous-flow steam generators, comprising feedwater pipes, is connected between the outlet from the high-pressure heaters and the inlet to the water economizer of at least two adjacent power units 1.

The disadvantage of this scheme is low efficiency with simultaneous start-up of several power units due to the use of extraneous heat.

The aim of the invention is to improve the economy.

This goal is achieved by the fact that the feedwater pipes are additionally connected to the outlet of the evaporation and superheating parts.

The drawing shows a schematic start-up scheme for two power units in terms of steam generators.

The power units (represented conventionally by a part of the steam generator circuit 1, 2) contain

deaerators 3 with feed pumps 4 and high pressure heaters 5, and each of the steam generators 1, 2 is equipped with a water economizer 6 and an evaporation 7 and a superheater 8 parts separated by a built-in valve 9. Between the high pressure heaters 5 and a water economizer 6 control valves 10, 11 are installed. Common feedwater pipes 12, 13 are connected by pipelines 14, 15 with shut-off and control valves 16-19 installed between them, economizer 6 and control valves 10, 11. Pate 13 common pipe This water is connected through the built-in separator 20 and the catchment line 21 by pipe 22 to the outlet of the evaporation part 7, as well as to the outlet of the superheating part S. On the steam line 23 of the built-in separator 20, the water discharge line 21 and pipe 22, the stop-valve 2 is installed. thirty. The common feedwater pipeline 12, by pipes 31, on which shut-off valves 32, 33 are installed, is connected between high-pressure heaters 5 and control valves 10, 11.

The start-up of power units using this start-up scheme is carried out as follows.

In the case of simultaneous start-up of a group of power units (at least two), the steam generator (housing) of one of them is transferred to the boiler mode to supply hot water to the steam generators in parallel with the power units being started. When starting, for example, a power unit in steam boiler mode, the steam generator of power unit 1 is operating. When starting from a cold or sufficiently cooled state of the feed pump 3 of the power unit, the water after the high pressure heaters 5 is supplied through a common pipe 12 to the water economizer, b of the steam generator of the power unit I, through the valves 33 and 16, is heated in a water economizer 6, evaporative 7 and superheating 8 parts and returns after superheating part 8 via pipeline 22, common pipeline 13 and pipeline 15 to the inlet of water economizer 6 of the steam generator 2 of the power unit. At the same time, the shut-off and control valves 17, 18, 28, 30, 32 and the control valves 10, 11 are closed, and the shut-off and control valves 16, 19, 33 are open. When starting from a hot state heated in the water economizer 6 and the evaporative part 7 of the steam generator 1 of the power unit, the water after the evaporation part 7 returns to the input of the water economizer 6 of the steam generator 2 of the power unit through the built-in separator 20, discharge line 21 and pipelines 22, 13, 15 .

In addition, with a steam generator (in this case, on the steam generator 1 of the power unit) shut-off and control valves 29 are opened from the cold state, the valve 9 is built-in with shut-off and control valves 25, 27. When starting from the unheated and hot conditions, the shut-off valves - control valves 25, 27 and shut-off and control valves -24, 26 and valve 9 are closed.

The steam generator of unit 1, operation in the hot-water mode, can supply two or more steam generators of simultaneously launched power units with hot water.

As the power units turn around, the required temperature of the superheated steam increases, and the heat release in the steam generator furnaces increases. The transition to the normal power supply of the steam generators, in this case, the steam generator 2 of the power unit, is carried out by gradually opening the control valve 11. In the normal mode, the shut-off and control valves 18, 19, 28, 30, 33 are closed, the control valve 11 is open. The steam generator 1 of the power unit operating in the boiler mode, in the process of transition to the normal power supply unit of the power unit, may unload and stop, further thaw, or, work in the mode of the water boiler, continue to supply other commissioned power units with water.

The use of the proposed start-up scheme allows shortening the start-up period, improving the conditions for adjusting steam parameters at the outlet of the steam generator being started, warming up the power unit elements with permissible speeds, which increases the maneuverability and cost-effectiveness of start-ups, and increases the service life of the equipment.

Form la invention

The start-up scheme of power units with continuous steam generators, containing feedwater pipelines, is connected between the outlet of the high-pressure heaters and the inlet to the water economizer of at least two adjacent power units, the steam generators of which have evaporative and superheating parts, which is different in that increase efficiency, feedwater pipelines are additionally connected to the outlet of the evaporation and superheating parts.

Sources of information taken into account in the examination 1. USSR author's certificate in application No. 2723413, cl. F 01 K 13/02, 09.02.79.

Claims (1)

Claim Starting scheme of power units with direct-flow steam generators containing feedwater pipes connected between the outlet from the high-pressure heaters and the inlet to the water economizer of at least two adjacent power units whose steam generators have evaporative and overheating parts, characterized in that, in order to improve efficiency, feedwater pipes are additionally connected to the outlet of the evaporation and superheating parts.