Heat supply system and method adopting heat-storage auxiliary peak-regulation and used for coal-fired power generator set

Abstract

The invention relates to the field of heat supply for thermal power plants, and specifically relates to a heat supply system and method adopting heat-storage auxiliary peak-regulation and used for a coal-fired power generator set. The heat supply system comprises a front end and a tail end, wherein at least two branches are comprised between the front end and the tail end; the branches are joinedand communicated at the front end and the tail end of the heat supply system separately; each branch comprises a heat supply branch and a heat storage-taking branch; a heat exchange unit is arranged on each heat supply branch, and each heat supply branch carries out heat exchange with a heat network through the corresponding heat exchange unit; and a heat storage-taking unit is arranged on the heat storage-taking branch, and each heat storage-taking branch stores and takes heat passing through the heat storage-taking branch through the corresponding heat storage-taking unit. According to the heat supply system and method adopting heat-storage auxiliary peak-regulation and used for the coal-fired power generator set, in the case of valley electricity, the heat of steam is stored into a heatstorage body by regulating steam extraction; and in the case of peak electricity, the heat supply amount of the steam extraction is avoided or reduced, a heat supply load is met by virtue of the heatstored in the heat storage body, and steam in a steam turbine is completely used for applying work to meet the requirements of an electricity network, so that thermoelectric decoupling is realized toa certain extent.

Description

technical field [0001] The invention relates to the field of heat supply for thermal power plants, in particular to a heat storage type auxiliary peak regulation heat supply system and method for a coal-fired generating set. Background technique [0002] In recent years, with the continuous increase of environmental protection policies, the original small and medium-sized boilers that were responsible for large-scale heating in northern my country have been continuously dismantled and transformed. People have higher and higher environmental protection requirements for coal heating and energy supply, and the heating pressure is increasing. protrude. [0003] However, due to the characteristics of my country's coal-rich, oil-poor, and gas-poor energy structure, vast geographical span, and large-scale population, coal-fired heating will still be the main method of heating for a long period of time in the future. Among them, coal-fired heating mainly includes two methods: cogene...

AI Technical Summary

Problems solved by technology

However, the combined heat and power generation closely links the power generation of the power plant with the heat consumption of users, which reduces flexibility. Under the condition of ensuring the heating load, the ability of the unit to participate in peak regulation will be affected to a certain extent

Since the combined heat and power unit needs to meet both the power supply demand and the heating load demand, when the power grid requires the thermal power plant to participate in peak regulation, it is easy to cause a reduction in heating load or insufficient peak regulation capacity.

Images