Fused salt heat accumulating peak regulating system for heat-engine plant heating by means of main steam

Abstract

The invention relates to a fused salt heat accumulating peak regulating system for a heat-engine plant heating by means of main steam and belongs to the technical field of heat accumulating peak regulating of heat-engine plants. The system comprises a main steam regulating valve, a high pressure steam-fused salt heat exchanger, a reheated steam regulating valve, a high temperature fused salt tank,a high pressure fused salt pump, a low temperature fused salt tank, a low temperature fused salt pump, a throttling valve, a high pressure heater, a water delivery pump, a deaerator, a boiler, a highpressure cylinder and a medium pressure cylinder. When the electrical load is reduced, the utilization ratio of the boiler is fully exerted; a fused salt heat accumulating system is additionally arranged to store heat of residual stem of the boiler in the high temperature fused salt through the high pressure steam-fused salt heat exchanger; in the electrical peak stage, the high temperature fusedsalt is extracted from the fused salt tank to be fed to the high pressure steam-fused salt heat exchanger again to heat the boiler feed water and generate high temperature high pressure steam and issent to a turbine to increase the generating capacity of the turbine and play a peak regulating role on a unit. Residual steam generated by the boiler can be recovered when the electrical load is relatively low, so that the utilization ratio and the operating safety of the boiler are improved, and the purpose of being energy-saving is achieved.

Description

Technical field: [0001] The invention provides a thermal power plant molten salt heat storage and peak regulation system heated by main steam, the system can store the excess heat generated by the power plant when the power consumption is low and in the high temperature molten salt for the unit during the peak period of power consumption Peak shaving belongs to the technical field of thermal power plant heat storage peak shaving. Background technique: [0002] Due to the adjustment of my country's economic structure, the composition of electricity consumption has undergone great changes: the peak electricity load has increased, the low-peak electricity consumption has decreased significantly, and the peak-to-valley difference has continued to widen. And as the capacity of the power grid continues to expand, more and more high-parameter and large-capacity units are gradually put into operation, leading to a further increase in the contradiction between peak and valley differe...

AI Technical Summary

Problems solved by technology

And as the capacity of the power grid continues to expand, more and more high-parameter and large-capacity units are gradually put into operation, leading to a further increase in the contradiction between peak and valley differences

During the period of low power consumption, the thermal power plant unit is in the load reduction stage, and the steady combustion load of the boiler when it is in operation cannot be synchronized with the minimum load of the steam turbine. If the required output power is less than the steady combustion load of the boiler, in order to ensure the safe operation of the boiler The steam production is greater than the steam consumption of the steam turbine, and a part of the main steam will be wasted

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