Supercritical/super-supercritical unit heating drain recovery method

Abstract

The invention discloses a supercritical/super-supercritical unit heating drain recovery method. The method has the advantages that heating drain and two heating drain coolers arranged in different positions on a host machine condenser water pipeline are subjected to twice heat exchange, and the heat energy devaluation of a system is reduced, so the total heat efficiency of a unit heat recovery system is improved, and the heat consumption rate of a steam turbine is reduced. Simultaneously, on the premise that the unit steam inlet parameters and the flow rates are identical, the heat return steam pumping flow rate at a grade with high steam pumping pressure on a steam turbine low-pressure cylinder is reduced, and the part of high-quality steam is used for power generation, so the unit power generation quantity is increased.

Description

technical field [0001] The invention relates to a method for recovering heating drainage of a supercritical / ultra-supercritical unit, in particular to the installation position, the number of installations and the connection method of a pipeline system of a heating drainage cooler in a condensate water system of a main engine. Background technique [0002] With the rapid development of my country's economy and the continuous improvement of people's living standards, the demand for heating and heating consumption has become larger and larger. The governments at all levels in northern cities in my country have incorporated heating planning into the city's overall urban planning. In the overall planning, the thermal power plant has become the main source of heat for urban central heating. [0003] Since the operating economy of supercritical / ultra-supercritical units is significantly better than that of subcritical units under the same installed capacity level and other boundary...

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Problems solved by technology

[0006] The disadvantage of this heating drainage recovery method is that the heating drainage and the condensed water of the main engine only conduct heat exchange once in the heating drainage cooler. The increase in depreciation reduces the economy of the entire regenerative cycle system; on the other hand, due to the large flow of heating and drainage, the temperature rise of condensed water is large, so that the regenerative extraction system of the low-pressure final stage or even the sub-final stage of the steam turbine cannot operate normally. It will also reduce the thermal efficiency of the overall cycle of the unit

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