RU2412358C1 - Plant for preparing make-up water of combined electric power-and-heat generating plant with open heat-extraction system - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: plant for preparing make-up water of combined electric power-and-heat generating plant with open heat-extraction system includes steam turbine with two heat extracting devices of steam, with are connected by means of steam lines to lower and upper system water heaters and condensers, steam turbine with heat extraction and industrial steam extracting devices, water-to-water heater, heater of heating water, calcinatory, vacuum deaerator, storage tank, raw make-up water pipeline, softened make-up water pipeline, deaerated water pipeline, heating water pipeline, return delivery water pipeline, direct delivery water pipeline, chemical water treatment plant, and ejector. At that, it is also equipped with continuous blowdown expansion tank of steam boiler, continuous blowdown cooler, heater, heated delivery water pipelines, blowdown water pipeline, and cooled delivery water pipeline.

EFFECT: improving thermodynamic efficiency and electric power generation at thermal input in combined electric power-and-heat generating plant with open heat extraction system.

1 dwg

Description

The invention relates to industrial power engineering and can be applied in power engineering at combined heat and power plants with an open heating system.

In a typical installation for the preparation of make-up water, a combined heat and power plant with an open heating system is used to heat raw make-up water before chemical water purification is performed in the condenser of a steam turbine, followed by its deaeration in a vacuum deaerator. The heating medium in the vacuum deaerator is hot mains water after the upper main heater of the cogeneration plant. (L.A. Richter, D.P. Elizarov, V.M. Lavygin “Auxiliary equipment of thermal power plants.” Textbook for universities. - M.: Energoizdat, 1987. Fig. 3.15, p. 65).

The disadvantages of this installation are the time-variable temperature of the raw make-up water (10-25 ° C), insufficient for normal operation of chemical water purification (28-30 ° C) and reduced thermal efficiency of the cogeneration plant.

Closest to the technical nature of the proposed invention is the installation for the preparation of make-up water of the combined heat and power plant, which provides for the heating of raw water before chemical water treatment - first in the condenser of a steam turbine with two heat recovery steam, and then in the water-to-water heater due to the heat of the network water from the heating network supplied from direct network water pipe after the upper network heater of a steam turbine. Mains water, cooled in a water-to-water heater, is fed into the feed pipe of the heating network. (VI Sharapov “Preparation of make-up water for heat supply systems using vacuum deaerators” .- M.: Energoatomizdat, 1996. Fig. 8.4, p. 133).

The disadvantage of the described installation, adopted as a prototype of the invention, is the insufficient efficiency of using low-potential heating taps of a steam turbine with two heating taps in it.

The technical result of the invention is to eliminate the noted drawback, increase the thermodynamic efficiency and increase the generation of electricity from heat consumption in a combined heat and power plant with an open heating system.

The technical result is achieved due to the fact that the installation for the preparation of make-up water for a combined heat and power plant with an open heating system contains a steam turbine with two cogeneration steam taps connected by steam pipelines with lower and upper network heaters and a condenser, a steam turbine with cogeneration and industrial steam taps, water-water heater, heating water heater, decarbonizer, vacuum deaerator, storage tank, raw make-up water pipeline, the pipeline is softened oh makeup water, deaerated water pipeline, a pipeline heating water feedback mains water pipeline network water pipe line; in the pipeline of raw make-up water of the heating system, a steam turbine condenser with two cogeneration steam extraction, a water-water heater, chemical water treatment are included; chemical water purification by a softened make-up water pipeline is connected through a decarbonizer to the first inlet of the vacuum deaerator, its second inlet is connected by a heating water pipeline through a heating water heater to a direct network water pipe, the first outlet of a vacuum deaerator is connected by a deaerated pipe through a tank - accumulator and a recharge water pipe to the return network pipe water, and its second outlet is through an ejector with atmosphere, moreover, it is additionally equipped with an expander of continuous blowing of steam Vågå boiler cooler continuous purge preheater, preheated pipe network water pipe purge water cooled pipe network water; a condenser of a steam turbine with two heating steam extraction and a water-to-water heater, with the subsequent combination of the flows of raw make-up water passing through the condenser and the water-water heater with their sequential supply to the raw water heater and to the continuous purge cooler, are simultaneously included in the raw makeup water pipeline; the inlet of the water-to-water heater is connected by a heated network water pipe to the outlet of the lower network heater, and the water-to-water heater output is connected by the cooled network water pipe to the make-up water pipe, the continuous boiler purge expander is connected by the purge water pipe through the continuous purge cooler to the third input of the vacuum deaerator .

The drawing shows a schematic diagram of an installation for the preparation of makeup water of a combined heat and power plant with an open heating system. It includes: a steam turbine 1 with two cogeneration steam extraction and a condenser 6, a steam turbine 2 with cogeneration and industrial steam extraction, a continuous purge expander 3 steam boiler, purge water pipe 4, raw water pipe 5, water-water heater 7, heating heater water 8, direct network water pipe 9, purge cooler 10, heated network water pipe 11, upper network heater 12, heater 13, chemical water treatment 14, softened water pipe 15, decarbonizer 16, vacuum the second deaerator 17, the heating water pipe 18, the lower network heater 19, the storage tank 20, the make-up water pipe 21, the return network water pipe 22, the chilled network water pipe 23.

The parallel inclusion in the pipeline of raw make-up water 5 of the condenser 6 and the water-water heater 7 makes it possible to efficiently use both the ventilation flow of steam spent in the steam turbine 1 and the network water heated in the lower network heater 19 for heating the raw make-up water, to increase the steam extraction from the lower heat recovery selection of steam turbine 1, to increase the production of electricity from heat consumption and the thermal efficiency of the cogeneration plant. The use of a purge cooler 10 and a heater 13 allows you to utilize the heat of the purge water of the continuous blower expander 3 of the steam boiler and maintain the optimum temperature of the raw water before chemical water treatment when changing climatic conditions and operating conditions of the cogeneration plant.

Installation for the preparation of makeup water cogeneration with an open heating system works as follows. The raw water supplied to the installation through the raw water pipeline 5, in two parallel flows enters the heating surface of the condenser 6 of the steam turbine 1 and the water-water heater 7, is heated in them by the heat of condensing steam and the heat of the network water supplied to the water-water heater 7 from the bottom network heater 19 through the heated network water pipe 11. Next, the raw water is heated in the purge cooler 10 by the heat of the purge water of the continuous blower expander 3 of the steam boiler supplied through the pipeline at the purge water 4. The purge water cooled in the purge cooler 10 is supplied through the purge water pipe 4 to the third inlet of the vacuum deaerator 17. After the purge cooler 10, the raw water is heated in the heater 13 due to the heat of the heat recovery of steam from the steam turbine 2 and is supplied to the chemical water treatment 14. From it through the pipeline of softened water 15 make-up water is sent to the decarbonizer 16, where carbon dioxide is removed from it. From it, decarbonized make-up water is supplied to the first inlet of the vacuum deaerator 17. The heating agent in the vacuum deaerator 17 is hot network water supplied to the second inlet of the vacuum deaerator 17 from the direct network water pipe 9 through the heating water pipe 18, preheated in lower 19, upper 12 network heaters and in the heating water heater 8, heating water in the heating water heater 8 is heated due to the heat of industrial steam extraction of the steam turbine 2.

The deaerated make-up water of the heating network enters the storage tank 20 and is fed through the make-up water pipe 21 to the return network water pipe 22. Water is also supplied from the water-water heater 7 through the chilled network water pipe 23.

Claims (1)

Installation for the preparation of make-up water for a combined heat and power plant with an open heating system, comprising a steam turbine with two heat recovery steam coupled by steam lines with lower and upper network heaters and a condenser, a steam turbine with heating and industrial steam take-offs, a water-water heater, a heating water heater, a decarbonizer , vacuum deaerator, storage tank, raw make-up water pipeline, softened make-up water pipeline, deaerated pipeline water, heating water pipeline, return network water pipeline, direct network water pipeline; in the pipeline of raw make-up water of the heating system, a steam turbine condenser with two cogeneration steam extraction, a water-water heater, chemical water treatment are included; chemical water treatment by a softened make-up water pipe is connected through a decarbonizer to the first inlet of the vacuum deaerator, its second input is connected by a heating water pipe through a heating water heater to a direct network water pipe, the first output of a vacuum deaerator is connected by a deaerated pipe through a storage tank and a make-up water pipe to a reverse network pipe water, and its second outlet is through an ejector with an atmosphere, characterized in that it is additionally equipped with an expander continuously th purge of the steam boiler, continuous purge cooler, heater, heated network water pipe, purge water pipe, chilled network water pipe; in the pipeline of raw make-up water, a steam turbine condenser with two heat extraction steam and a water-water heater are combined in parallel, followed by combining the flows of raw make-up water passing through the condenser and the water-water heater, with their sequential supply to the raw water heater and the continuous purge cooler; the inlet of the water-to-water heater is connected by a heated network water pipe to the outlet of the lower network heater, and the water-to-water heater output is connected by the cooled network water pipe to the make-up water pipe, the continuous boiler purge expander is connected by the purge water pipe through the continuous purge cooler to the third input of the vacuum deaerator .

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