Absorption heat pump heat storage and heat releasing system used for heating unit and work method of absorption heat pump heat storage and heat releasing system

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 power engineering, in particular to an absorption heat pump heat storage and release system for a heating unit and a working method thereof. Background technique [0002] my country's large-scale coal-fired generating units not only bear the base load, but also undertake the task of power grid peak regulation. Since the annual utilization hours of thermal power units in my country have been maintained at about 4,000 hours in recent years, heating units in northern regions are also facing great pressure for peak regulation. In order to solve the problem of flexible operation and deep peak regulation of heating units, scholars at home and abroad have proposed a technical solution to install heat storage tanks in thermal power plants for thermoelectric decoupling. The steam extraction is not only used to heat the circulating water of the heating network, but also used to heat the heat storage medium in the he...

AI Technical Summary

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

Images