Peak Valley electric heating molten salt heat storage technology to help heating "coal to electricity"

At present, the large area of ​​fog and haze in the entire North China centering around Beijing, Tianjin and Hebei has seriously affected the daily life and physical health of the people. The smoggy weather highlights the unreasonable energy utilization situation in Beijing, Tianjin and even in China , A large number of winter coal-fired heating is one of the main causes of serious winter air pollution in Beijing, Tianjin and Hebei.

Industry professionals said that the implementation of "coal to electricity" heating technology, the use of electricity to replace coal-fired boilers central heating, and gradually expand the proportion of electric heating, especially the promotion of grid peak-valley heating mode, is an effective control of air quality during the heating Important way At present, Beijing and its neighboring cities have all started the "coal-to-electricity" heating project, and all levels of government have promulgated relevant preferential policies.

At present, the use of peak-valley electric heating molten salt thermal storage of "coal to electricity" technology into the field of vision of the industry, it is understood that the technology is based on molten salt sensible heat storage electric heating central heating technology , The technology uses an independent molten salt heat storage central heating system, the use of low-cost electricity at night peak-valley molten salt storage during the day through the salt water heat exchanger circulating water heated to the heating temperature, the hot water delivered to the building The end of the coil, to achieve the building's heating function. The technology uses peak-valley electricity to meet the heating demand during peak daytime, effectively transfers surplus peak-valley power, improves grid stability and power utilization, and completely replaces the coal-fired heating boilers and realizes the building heating The "coal to electricity" project transformation.

It is understood that the fused salt storage central heating system uses two tanks of molten salt heat storage technology, the use of mixed molten salt as heat storage medium, the use of low-cost low-power molten salt storage, no longer consume electricity during the day heating. The technique of low-cost peak valley during the night time period, through the molten salt pump cold salt tank molten salt out to the molten salt electric heater to heat the molten salt to high temperature (about 500 ℃ or so) into the salt tank after During the peak of electricity during the day, molten salt pump is used to extract the high-temperature molten salt stored in the thermal salt tank to the molten salt-water heat exchanger, to heat the water circulation system for municipal heating to generate hot water, to provide heating to the residents or to provide bathing heat Water, no longer consumes electricity for heating molten salt. This technology only needs to transform the coal-fired boiler room of the central heating system into a molten salt regenerative electric heating system, and the municipal pipe network and the heating end-user equipment need not be transformed to minimize the reconstruction cost, meanwhile, The purpose of the valley.

During the night, the electric grid will be delivered to the molten salt electric heater. The low-temperature molten salt will be heated and stored in the high-temperature tank. When heating, the high-temperature molten salt will be sent to the molten salt-water heat exchanger to heat the heating water. The cooled molten salt will return Cold salt tank waiting for heating again at night, to achieve the entire heating cycle. System structure is simple, less equipment, reliable and safe operation, the real green heating while mitigating grid peak difference, to achieve peak shifting valley.

The use of peak-valley electric heating molten salt heat storage central heating "coal to electricity" technology implementation system includes high and low temperature molten salt tank, molten salt pump, molten salt electric heater, molten salt - water heat exchanger, mixed molten salt And other equipment and materials, the system is simple in structure and mature in technology, and is very suitable for use in residential, commercial real estate, tourist area construction and villa area with a building area of ​​more than 10,000 square meters in Beijing, Tianjin and Hebei. The system-wide investment cost is about Rice 150 yuan, the heating season operating costs according to the peak valley price varies between 13 yuan to 18 yuan per square meter, has good economic performance, suitable for large-scale promotion and application.

On January 22, Li Yabin, chairman of CIC Yixing New Energy Investment Co., Ltd. (hereinafter referred to as "CIC Yixing"), said at a news conference held by the All-China Federation of Industry and Commerce New Energy Chamber of Commerce that CIC Xinyu New Energy Investment Co., Ltd. and Beijing Polytechnic University, "Heat Transfer Enhancement and Key Laboratory of Energy Saving Ministry of Education," Professor Ma Chung-fang, a joint venture team formed billion Hongxing Solar Technology Co., Ltd., Department of solar thermal power storage system technology and equipment to provide professional Business, integrators and service providers. The company's technical team has accumulated a full range of patented and non-patented technologies in the field of molten salt heat storage and thermal storage. It owns the only proprietary system of high-temperature molten salt storage system in the country and has achieved leading international research results in the field of low melting point molten salt And products.