Heat supply and power generation decoupling method and system for improving peak regulation capacity of heat supply unit

Abstract

The invention discloses a heat supply and power generation decoupling system and method for improving the peak regulation capacity of a heat supply unit. The method specifically comprises the following steps: when the unit supplies heat to the exterior at a higher load, leading out a high-parameter medium in part of the unit to a heat storage system, and storing part of heat on the premise of meeting the heat supply requirement; when the unit participates in power grid peak regulation and needs to reduce output for external heat supply, reducing the amount of steam entering a steam turbine, reducing the output of the steam turbine, achieving load-reducing peak regulation operation of the unit, meanwhile, extracting part of steam or hot water from a heat regeneration system or a heat supply system of the unit to the heat storage system, stored heat is absorbed for external heat supply, and the heat supply requirement is met; and a heat storage module is additionally arranged in the heat supply unit, decoupling of heat supply and power generation of the unit is achieved, unit peak regulation is not limited by heat supply, the peak regulation range of the heat supply unit is enlarged, the operation flexibility of the heat supply unit is greatly improved, only one set of heat storage module is additionally arranged on an existing unit, and good applicability to newly-built and reformed units is achieved.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a method and system for decoupling heat supply and power generation for improving the peak regulation capability of a heat supply unit. Background technique [0002] The installed capacity of renewable energy has increased year by year, gradually reducing the proportion of thermal power generation in the energy structure. Most of the renewable energy has strong randomness, intermittence, uncontrollability and anti-peak regulation, so thermal power generation is required as the base load to participate in peak regulation to ensure the safety of the power grid. However, with the further implementation of the policy of thermal power to give way to new energy, the load of existing thermal power units fluctuates greatly, and the demand for deep peak regulation is becoming more and more urgent. At present, the main power source in my country's "Three North...

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Problems solved by technology

However, with the further implementation of the policy of thermal power to give way to new energy, the load of existing thermal power units fluctuates greatly, and the demand for deep peak regulation is becoming more and more urgent

At present, the main power source in my country's "Three Norths" region is coal power, of which the installed units of heating units account for more than 50%. Under the condition of ensuring the heat supply of the unit, the load of the unit needs to be maintained at a relatively high level, and the load cannot be further reduced. Severely limits the flexibility of the power supply

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