Low-melting-point salt and water combined energy level utilizing system for peak shaving of thermal unit

Abstract

The invention provides a low-melting-point salt and water combined energy level utilizing system for peak shaving of thermal unit, belongs to the field of thermal power plant flexible converting, andaims at solving the existing problem of higher energy saving cost when a melting salt is solely taken as an energy storage medium. The system comprises a temperature and pressure adjusting device, a saline water heat exchange device, a cold salt tank and a hot salt tank, boiler main steam is connected with a medium inlet of the saline water heat exchange device passing through a first air pipe, the water energy storage system comprises a water-water heat exchange device and a hot water storage tank, a medium outlet of the saline heat exchange device is connected with a medium inlet of the water-water heat exchange device through a second connecting pipe, a hot water supplying system comprises a water source and a heating device, and a high-temperature melting salt heat exchange system comprises an evaporator or a steam heating device. The system has the advantages that classification storage and classification utilization of energy are conducted, the energy storage cost can be effectively reduced through the water energy storage system when same energy is stored, and the effectiveness of a high grade thermal source can be maintained through the low-melting-point, melting salt energy storage system.

Description

technical field [0001] The invention is applicable to the field of flexible transformation of thermal power plants, and in particular relates to a molten salt energy storage transformation and an urban hot water supply system. Background technique [0002] According to preliminary estimates, by 2020, the installed capacity of wind power and solar energy in my country will reach 220 million kilowatts and more than 110 million kilowatts respectively. New energy is greatly affected by weather changes. As an important means of power grid deployment, thermal power needs to meet the needs of the power grid at different times. As a result, a large number of thermal power units need to maintain low-load operation during non-peak hours, but when the load of thermal power units is reduced to about 35%, the reliability of the boilers will deteriorate, and it is difficult to further reduce the load of the units. How to further improve the flexibility of thermal power units under the cond...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that when water is simply used as an energy storage medium, the water cannot be heated to a higher temperature under normal pressure due to the influence of the saturation temperature, and the thermal grade is lower. To solve the problem of high energy cost, and provide a low melting point salt and water combined energy level utilization system for peak regulation of thermal power units

Images