SU1252513A1 - Non-deaerator system of steam turbine regeneration - Google Patents

Description

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The invention relates to a power system, in particular, to heat recovery systems of steam turbines of thermal power plants, namely to non-aerating regeneration systems that allow all turbo-heat exchangers to be located near the turbine and thus meet the requirements for efficiency, simplicity, reliability and ease of maintenance, which present to modern high-power turbo-stations.

The purpose of the invention is to increase efficiency and reliability in transient conditions.

The drawing shows a schematic diagram of the proposed regeneration system.

The system contains a condenser 1 with a condensate trap 2, mixing heaters 3, surface heaters 4 and 5, respectively, low and high pressure, condensate booster and feed pumps 6-8, respectively, with pressure and suction nozzles 9 and 10, and receiving and drain chambers 1I and 12 seals, respectively, a condensate storage tank 13 with a pump 14 and a two-stage mixer 15. Pipelines 16-19 with non-return valves 20 serve to supply water with different temperatures to the mixer 15. Pipeline 21 serves to remove water from drain chambers 12 of buster 7 and feed pump 8 to the mixing heater 3. Pipeline 22 with valve 23 serves to recirculate water through the feed pump to the mixing heater. A filter 7.4 is installed between the steps of the mixer 15,

The regeneration system works as follows.

During normal operation, the feed water from the condensate collector 2 of the condenser 1 is pumped out of the condensate

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MI, booster and feed pumps 6-8 through mixing and surface heaters 3-5 low and high pressure in the steam generator of the power unit (not shown). In this case, the water is heated to the design temperature in each heating stage. Reliable operation of the feed pump 8 in the deaerator-free scheme is provided by the condensate and booster pumps along the water course, which create the necessary backwater in the suction nozzles 10. Water from the discharge chamber 12 of the feed pump 8 is supplied to one of the mixer sections 15, to the other section heating steam condensate from high pressure preheater 5. Supply through the mixer section 15 of these hot streams, without reducing the reliability of the nutrient pump, increases the efficiency of the power plant. Water from the end chambers 12 of the booster and feed pump seals 7 and 8 is discharged to the mixing preheater 3.

In thermal circuits of large-capacity turbines, two booster-feed pumps are used, as a rule, one of which can be repaired. When the booster-feed pump is taken out of repair, valve 23 is disconnected in line 22, and water is supplied to mixer 15 via lines 16 and 17, with different costs and expenses from tank 13 and mixing preheater 3. Increasing water flow through the pipeline 17 and lowering it through conduit 16, the temperature at the inlet to the booster pump 7 is smoothly stepped up and the entire feeding unit is gradually heated. After warming up and turning on the pump 4 into operation, the pipes 16, 17 and 22 are shut off by closing the valves 20, and the pipes 18 and 19 are turned on and thereby smoothly transition to the operating mode.

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Compiled A. Bulynko Editor A. Sabo Tehred M. Khodanich Proofreader V. But ha

Order 4604/36 Edition 500 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (3)

1. NON-DEAEAERATOR SYSTEM OF STEAM TURBINE, comprising a condenser included in the condensate feed line, mixing and surface low pressure heaters, surface high pressure heaters equipped with heating steam drain pipes that are connected by a mixer with a path, condensate, booster and pressure and suction pipes and intake and drain chambers of seals, as well as a source of cold condensate connected to the path, characterized in that In order to improve efficiency and reliability in transient conditions, the mixer is formed of at least two-stage, placed between the last downstream of the condensate preheater and a low-pressure booster pump and a discharge nozzle connected to the condensate pump to the drain pump chamber seals the nutrient source and the cold condensate. 2. The system of claim. ^ Characterized in that the receiving chambers of the seals of the feed and booster pumps are additionally connected to the discharge pipe of the condensate pump located between the mixing and surface low-pressure heaters. 3. The system of claims 1 and 2, characterized in that the drain chambers of the seals of the feed and booster pumps are connected to a mixing low-pressure heater. 12