Heating method and heating system for combined heat and power unit

Abstract

The invention relates to the technical field of steam turbine generator sets, and in particular provides a heat supply method and a heat supply system for cogeneration units that solve the contradiction between heat load demand and electric load peak shaving at the same time during the heating period. The heat supply method and system can adopt a high back pressure heat storage mode when the heat load demand is low and the electric load demand is high, and when the heat load demand and the electric load demand are both high, and the heat load demand is higher than the unit according to the electric load demand When the production capacity matches the heat production, the high back pressure heat release mode is adopted. When the electric load demand and heat load demand are both low, the low-pressure cylinder near-zero output heat storage mode is adopted. When the electric load demand is low and the heat load demand is high , and when the heat load demand is higher than the heat output matching the unit’s power output according to the electrical load demand, the low-pressure cylinder’s near-zero output heat release mode is adopted.

Description

technical field [0001] The invention relates to the technical field of steam turbine generator sets, in particular to a heat supply method and a heat supply system for a cogeneration unit. Background technique [0002] In my country's "Three North" region, due to the high proportion of coal-fired heat and power, the construction conditions of peak-shaving power supply are insufficient, and the unit has to undertake the task of heating in winter, and it is difficult to adjust the peak load of the unit during the winter heating period, resulting in a serious problem of wind power curtailment in the power grid. As an important industry in urbanization construction, combined heat and power units have played a vital role in controlling environmental pollution instead of shutting down small coal-fired heating boilers. However, in conventional combined heat and power units, the exhaust steam of the medium-pressure cylinder of the steam turbine is usually used to heat the return wat...

AI Technical Summary

Problems solved by technology

[0004] In view of the large contradiction between heat load demand and electric load peak shaving of cogeneration units during the heating period, when traditional steam extraction heating units use medium-pressure cylinder extraction for heating, there is a loss of low-pressure cylinder exhaust steam cold source that cannot be fully utilized Shortcomings

This poses a greater challenge to how to improve the flexibility of unit load peak regulation during the heating period of the unit and the heating economy of the unit

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