SU856997A1 - Multistep unit for instant boiling - Google Patents

Description

one

The invention relates to the field of power engineering and can be used at thermal and nuclear power plants for the preparation of additional water.

The evaporating unit is known, the evaporator of which is connected via a heating pair to the turbine selection, and via a secondary pair to an evaporator condenser connected to the condensate path between the regenerative preheaters Ul}

The disadvantage of such an installation is the unloading of the regenerative preheater connected to the same outlet with the evaporator to the amount of heat absorbed by the condenser in the evaporator condenser, tTO necessitates an increase in the heat exchange surface of the preheater.

Also known is a multistage evaporative installation of instantaneous boiling containing evaporation steps communicated in pairs with chambers.

secondary steam condensation included in the feedwater circuit through a cooling medium, connected to the last feedwater pipeline and a circulation water preheater communicated directly with a steam turbine regenerative tapping.

The disadvantage of such a plant is its low cost due to the lack of power generation by selected steam and heat losses associated with cooling the circulating water to condense the last stages of steam.

15 on large heat exchange surfaces of the condensation chambers.

The purpose of the invention is to reduce the size of the installation.

This goal is achieved by

Claims (2)

20 that the condensation chamber, at least of the last evaporation stage, is connected to the condensate path of the steam turbine by means of a cooling medium. 3 The drawing is a schematic diagram of a multistage evaporative installation of an instant eyelid pani. The installation contains evaporation stages 1 communicated by pipelines 2 with secondary steam condensation chambers 3 connected via cooling medium to feed water circulation circuit 4 with feed water pipelines 5 and 6 connected to it, blown water and circulating water heater 7, reported steam with steam turbine extraction 8 (in the diagram there is no noKaaaHaj. Feedwater circulation circuit 4 contains a circulation pump 9. Condensation chamber 10, at least of the last stage 1I, and steam is included along the cooling medium in condensate path 12 steam turbine tank. Chambers 3 and About condensation have pipelines 13 for distilling distillate and heater 7 for circulating water pipe 14 for removing condensate of heating steam. The multi-stage evaporator instantaneous boiling plant works as follows: Steam from outlet 8 of the turbine enters the heater 7 for circulating water where it condenses, heating the circulating water.The condensate of heating steam through the pipeline 14 is discharged from the circulating water heater 7 into the turbo unit cycle. The heat of the circulating water enters the evaporation stages 1 sequentially from one to another, where it is partially evaporated. The resulting secondary vapor of the first few evaporation stages 1 is condensed in condensation chambers 3 cooled by: circulating water passing through these chambers 3 successively. The secondary vapor of the latter (one or several evaporation stages 1I is condensed by condensation from the tray 12 steam turbine condensate. Derived from the secondary steam distillers are discharged through pipelines 13 from chambers 3 and 10, condensation, and are used in the turbo unit cycle. Water is circulated with a cooling pump 9. Circuit 4 is fed with feed water through conduit 5 and purging through conduit 6 from it to maintain a certain water regime. Thus, turning on the condensation chamber at least the last stage of evaporation in the main condensate path of the steam turbine allows while maintaining its performance, reduce the heating surface of the installation and, as a result, its dimensions and metal consumption, as well as reduce the power of the circulation pump. Invention Multi-step evaporator instantaneous boil-up unit containing evaporation stages communicated in pairs with condensation chambers connected through the cooling medium to the feed water circulation circuit, connected to the latter feedwater pipelines, purging and circulating water heater, communicated in steam with regenerative bleeding a steam turbine having a condensate path, characterized in that, in order to reduce the overall dimensions, the condensation chamber, at least, the last evaporation stage in The coolant is connected to the steam turbine condensate path. Sources of information taken into account in the examination. I. Margulova T.K. Nuclear power plants. M., Higher School, 1978, p. 161. 2. Dykhno A.Yu. The use of seawater for thermal power plants. M., Energie, 1974. p. 126.