Adjustable feed water heat regenerative system for turbo generator unit

A technology of steam turbine generator set and heat recovery system, which is applied in the direction of feed water heater, steam generation, machine/engine, etc. It can solve the problems of affecting the service life of equipment, the reduction of average heat absorption temperature of boilers, and the reduction of feed water temperature, etc., and achieve economical Improved performance and safety, increased average endothermic temperature, and improved average endothermic temperature

CN102537933AActive Publication Date: 2012-07-04冯伟忠
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2012-07-04

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Abstract

The invention provides an adjustable feed water heat regenerative system for a turbo generator unit, which comprises a high pressure cylinder of a steam turbine, a final-stage extraction opening, a final-stage feed water heater, a steam extraction pipe and a regulating valve, wherein the final-stage extraction opening is additionally arranged on the high pressure cylinder; the steam extraction pressure of the final-stage extraction opening is much higher than the common highest extraction pressure; additionally extracted steam is used as a heat source of the final-stage feed water heater; the steam extraction pipe is connected with the final-stage extraction opening and the final-stage feed water heater; and the regulating valve is arranged on the steam extraction pipe. Part of steam which does work is guided to the feed water heater through the final-stage steam extraction pipe so as to further heat feed water of a boiler. The heat regenerative system provided by the invention is an elastic heat regenerative system. The temperature of the feed water can be maintained or changed under the variable load condition of the unit, so that the environmental friendliness, the economy and the safety of the unit are improved and the frequency modulation characteristic is perfected.
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Description

Technical field

[0001] The invention relates to an adjustable feed water regenerative system, which is used in a steam turbine generator set. Background technique

[0002] In recent years, with the rapid development of my country’s economy and the significant improvement of people’s living standards, the production and livelihoods of various industries have increased rapidly, and the peak-to-valley difference of the power grid has increased sharply. In order to ensure the safe power supply and power quality of the power grid, the power grid It must be equipped with sufficient peak-shaving capabilities to meet peaks and troughs. In our country, because coal-fired generating units account for more than 73% of the total installed capacity of power generation, large-scale thermal power units have to undertake the task of expanding the peak shaving capacity of the power grid, and therefore often operate in different load stages. At the same time, coal-fired thermal power plants are al...

Examples

Embodiment Construction

[0021] The elastic heat recovery system of the present invention is based on the existing heat recovery system by adding an extraction port with a higher extraction pressure to the high-pressure cylinder, a corresponding extraction pipe, and a high-pressure feedwater heater. The system introduces a part of the steam that has done work to the feedwater heater through the additional extraction pipe to heat the boiler feedwater, and its drain flows to the forward feedwater heater, and an extraction pipe is installed on the additional extraction pipe. The steam control valve adjusts the extraction steam, and can keep the pressure after the extraction steam control valve basically unchanged within the usual load change range to maintain the feed water temperature basically unchanged. The present invention numbers the order of the feedwater heaters according to the flow direction of the feedwater, so the high-pressure feedwater heater is also called the final stage feedwater heater. C...