Absorption heat pump heat storage and heat release system for heating unit and its working method

Abstract

The invention discloses an absorption heat pump heat storage and heat releasing system used for a heating unit and a work method of the absorption heat pump heat storage and heat releasing system. The system is composed of a liquid storage tank, a solution heat exchanger, an evaporator, a condenser, an absorber, a solution cooler, a liquid conveying pump, a liquid return pump, a valve, a relevant pipeline and other devices. The system has two tropical work processes of heat storage and heat releasing. By means of the system and the work method, the characteristic that when the concentration of a heat storage medium is changed, water vapor is absorbed or released is utilized so that latent heat storage of water for use can be achieved, meanwhile, the temperature changing range of the heat storage medium is enlarged, the latent heat storage amount is correspondingly increased, and therefore the heat storage amount of the unit heat storage medium is increased, the volume of a heat storage tank is reduced, and the system investment is reduced. The system works with the working process similar to an absorption heat pump all the time, exhaust waste heat of a turbine can be recycled, the heating capacity of a unit can be improved, the power generation coal consumption rate of the unit can also be reduced, and good heat economical efficiency and technical economical efficiency are achieved.

Description

Technical field [0001] The invention relates to the field of thermal energy power engineering, in particular to an absorption heat pump heat storage and heat release system for a heat supply unit and a working method thereof. Background technique [0002] my country's large-scale coal-fired generator sets not only undertake the basic load, but also undertake the task of power grid peak regulation. As the annual utilization hours of my country's thermal power units have been maintained at about 4000 hours in recent years, the heating units in the northern region are also facing great peak-shaving pressure. In order to solve the problems of flexible operation and deep peak regulation of heating units, scholars at home and abroad have proposed a technical solution of installing thermal storage tanks for thermoelectrolytic coupling in thermal power plants. Steam extraction is used not only to heat the circulating water of the heating network, but also to heat the heat storage workin...

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Problems solved by technology

Taking a 300MW heating unit as an example, its designed steam extraction capacity is 500t / h. Calculated according to the 8-hour heat storage and water temperature change value of 20°C, the volume of the heat storage tank has reached 127,000 cubic meters, surpassing my country's small 2 The capacity standard of the first-grade reservoir (100,000 cubic meters); since the unit does not supply heat and extract steam under the condition of heat release, its actual heat supply capacity also decreases

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