RU2531682C1 - Plant for treatment of make-up water of heat and power plant - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: invention relates to power engineering. A plant for treatment of make-up water of a heat and power plant, in which a steam turbine is equipped with a surface condenser of the first and second steps of heating to heat raw make-up water.

EFFECT: invention makes it possible to increase electric capacity, to generate electric energy for thermal consumption and to increase thermal efficiency of a heat and power plant, and also makes it possible to heat decarbonised make-up water upstream a vacuum deaerator, to increase efficiency of its deaeration, to reduce a flow rate of heating water to a vacuum deaerator and to increase thermal cost effectiveness.

2 dwg

Description

The installation for the preparation of make-up water for the combined heat and power plant can be used in power engineering at combined heat and power plants with an open heat supply system.

A typical installation for the preparation of make-up water of a combined heat and power plant provides for the heating of raw make-up water before chemical treatment in the condenser of a steam turbine with its subsequent deaeration in a vacuum de-aerator of make-up water of the heating system. The heating medium in the make-up vacuum deaerator is the hot mains water after the upper main heater of the cogeneration plant. This installation has a relatively low thermodynamic efficiency (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).

Closest to the technical nature of the present invention is a steam power plant with additional steam turbines mounted on a cogeneration plant with an open heating system (RF Patent No. 2261338, IPC F01K 23/10, 17/02). The cogeneration plant contains a cogeneration steam turbine with a condenser equipped with an integrated beam, chemical water treatment, a raw water pipeline, pipelines of the forward and reverse lines of the heating network, a make-up softened and deaerated water pipeline, network heaters. The combined heat and power plant is equipped with an energy gas turbine with a steam recovery boiler. The output of the recovery boiler is connected by a steam line to the input of additional steam turbines. The output of the additional steam turbines is connected via spent steam to contact capacitors. By softened make-up water, contact capacitors are connected at the inlet to the make-up water pipeline with chemical water treatment, and at the outlet - to the return pipe of the heating network.

The described installation of a combined heat and power plant with an open heating system with additional steam turbines is adopted as a prototype of the invention. The use of additional steam turbines in this installation, in the contact capacitors of which the heating water is heated, increases the thermal efficiency of the cogeneration plant.

At the same time, it has some disadvantages. The use of a gas turbine unit with a steam recovery boiler at existing CHP plants is often difficult due to layout considerations. In the prototype installation, additional steam turbines receive high-quality steam, at the same time, the condensate of this steam is mixed in contact condensers with make-up water and used to feed the heating system.

In this case, an irrevocable loss of high-quality condensate occurs, which is not economically feasible.

The aim of the invention is to eliminate the disadvantages of the prototype, increase the thermodynamic efficiency of the cogeneration plant and increase the generation of electricity for heat consumption.

This goal is achieved due to the fact that the installation for the preparation of make-up water of a combined heat and power plant with an open heating system, comprising: a steam turbine with a condenser equipped with an integrated beam, an additional condensing steam turbine, chemical water treatment, a decarbonizer, a vacuum deaerator, a crude make-up water pipeline, and a softened make-up pipeline water, the return pipe of the heating network, and the steam turbine with a condenser has industrial steam extraction, additional condensation the ion steam turbine has a surface condenser with first and second heating surfaces sequentially placed therein along the exhaust steam; a steam turbine industrial steam extraction line connects its industrial extraction with an additional condensing steam turbine, a raw make-up water pipeline through an integrated steam turbine condenser bundle with industrial steam extraction, a continuous blower expansion heater, a first condensing surface of an additional condensing steam turbine condenser and a heated raw make-up water pipeline connected to the inlet of chemical water treatment, the output of which through a decarbonizer, a decarbonization pipeline hydrochloric feed water, a second capacitor and a heating surface demineralized makeup water conduit connected to the input of the vacuum deaerator, the output of which through-accumulator tank and make-up water line connected to the pipeline heating system return line.

The use of an additional condensation steam turbine with a surface condenser, including the first and second heating stages, used to heat raw make-up water, in a heating water treatment plant with an open heating system, allows:

-increase electric power, electricity generation for heat consumption and increase the thermal efficiency of the cogeneration plant;

-heat decarbonized make-up water in front of the vacuum deaerator, increase the efficiency of its deaeration, reduce the consumption of heating water to the vacuum deaerator and increase the thermal efficiency of the cogeneration plant.

Figure 1 shows a block diagram of a combined heat and power plant with an open heating system, equipped with a plant for the preparation of make-up water. It consists of a block of cogeneration plant 1 and a block of an additional steam turbine 2.

Figure 2 shows the thermal diagram of the cogeneration plant with an open heating system and installation for the preparation of make-up water.

The cogeneration unit 1 contains: a steam turbine 3 with industrial steam extraction, an electric generator 4, a raw make-up water pipe 5, a condenser with an integrated bundle 6, a steam line 7, a continuous blower expander heater 8, a heated raw make-up water pipe 11, chemical water treatment 14, a decarbonizer 17, vacuum deaerator 18, softened make-up water pipe 19, storage tank 20, make-up water pipe 21, return network water pipe 22.

The unit of the additional steam turbine 2 contains: an additional condensing steam turbine 9 with an electric generator, a condenser 10, a first heating surface of the condenser 12, a second heating surface of the condenser 13, a decarbonized water pipeline 16.

The steam line 7 connects the industrial selection of the steam turbine 3 with an additional condensing steam turbine 9. The raw make-up water pipe 5 through the built-in condenser bundle 6, the continuous purge expander heater 8, the first heating surface of the condenser 12 and the heated raw make-up water pipe 11 are connected to the inlet of chemical water treatment 14. The output of which is through a decarbonizer 17, a decarbonized make-up water pipe 16, a second heating surface of the condenser 13 and a softened make-up water pipe 19 is connected to the inlet of the vacuum deaerator 18. Its output through the storage tank 20 and the make-up water pipe 21 is connected to the return pipe of the heating network 22.

Through the steam line, 7 pairs from the industrial selection of the steam turbine 3 are fed to an additional condensing steam turbine 9. Its useful work is used to drive the electric generator and generate electricity. The steam spent in this turbine enters the condenser 10, where it condenses. Through the pipeline of raw make-up water 5, the raw make-up water is supplied to the built-in bundle 6 of the condenser of the steam turbine 3 and heated in it due to the heat of condensing steam, then it is heated in the heater of the continuous blower expander 8 of the steam boiler and enters the first heating surface of the condenser 12, is additionally heated in it, due to the heat of condensation of steam and through the pipeline of heated raw make-up water 11, it is directed to chemical water treatment 14. Softened make-up water in it through the softening pipeline constant feed water 19 enters the precalciner 17, and through conduit dekarboniziruetsya decarbonated feed water 16 supplied to the second heating surface condenser 13. Here it is further heated steam condensation heat and the softened feed water conduit 19 is fed into the vacuum deaerator 18 where its deaeration is performed. The deaerated make-up water then enters the storage tank 20, from which through the make-up water pipe 21 it is supplied to the return pipe of the heating network 22 and feeds the network water of the cogeneration plant.

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 a condenser equipped with an integrated beam, an additional condensing steam turbine, chemical water treatment, a decarbonizer, a vacuum deaerator, a raw make-up water pipeline, a softened make-up water pipeline, a return heating line pipeline in that the steam turbine with condenser has industrial steam extraction, the additional condensing steam turbine has rhnostny capacitor successively arranged therein in the course of the exhaust steam of the first and second heating surfaces; a steam turbine industrial steam extraction line connects its industrial extraction with an additional condensing steam turbine, a raw make-up water pipeline through an integrated steam turbine condenser bundle with industrial steam extraction, a continuous blower expansion heater, a first condensing surface of an additional condensing steam turbine condenser and a heated raw make-up water pipeline associated with the inlet of chemical water treatment, the output of which is through a decarbonizer, a decarbonizer pipe In order to make up make-up water, the second condenser heating surface and the softened make-up water pipe are connected to the inlet of the vacuum deaerator, the outlet of which is connected through the storage tank and the make-up water pipe to the return network pipe of the heating network.

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