Double-extraction adjustable heating system of thermal power generating unit

Abstract

The invention relates to the field of thermal power generating unit heating modification and discloses a double-extraction adjustable heating system of the thermal power generating unit. By modifying a turbine heating pipeline, a first by-pass pipeline and a second by-pass pipeline connected with a high-pressure cylinder and a medium-pressure cylinder in parallel are arranged on a steam supplying pipeline of the high-pressure cylinder and the medium-pressure cylinder respectively. Each by-pass pipeline is connected with an adjusting gate, a spray type desuperheater and a pressure matcher, and the pressure matcher of the first by-pass pipeline injects exhaust steam of the high-pressure cylinder to achieve high-pressure steam supplying. The second by-pass pipeline injects low-pressure extraction steam of the medium-pressure cylinder to achieve medium-pressure steam supplying. Simultaneously, the opening degree of a middle adjusting gate is adjustable, and the opening degree of the middle adjusting gate is adjusted according to exhaust steam pressure change of the high-pressure cylinder and reheating steam pressure change caused by load change. Therefore, a steam supplying pressure requirement towards the outside is met, qualified steam supplying pressure is guaranteed, a purpose of double-extraction, adjustability and heating of steam of the unit for high-pressure industries and medium-pressure industries is achieved, modification cost of a unit body is saved, and an effect of reducing energy and emission is achieved.

Description

technical field [0001] The invention relates to the field of heat supply by thermal power units, in particular to a thermal power unit double pumping adjustable heat supply system. Background technique [0002] The development of combined heat and power technology has always been an energy-saving project recommended by the state. With the development of the heat market, the heating load borne by the unit will further increase, and the original unit must be upgraded to meet the growing demand for heating. [0003] Due to the variable operating conditions of the unit and the relatively stable pressure requirements of industrial extraction steam, it is necessary to use industrial extraction points with higher parameters to meet the requirements of industrial extraction steam parameters under different loads. In addition, affected by the structure of the steam turbine, the steam extraction parameters of the unit vary greatly with the load, so the steam turbine body needs to be ...

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Problems solved by technology

[0005] The above-mentioned conventional transformation method, on the one hand, due to the high selection of heating parameters, the overall unit economy is poor; on the other hand, the transformation of the steam turbine body is required, and the investment is relatively high. Realized technical risk

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