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Molten salt heat storage scheme

作者:山西常晟集团时间:2021-09-23

Pain point

The global new energy industry is booming. With the continuous progress of technology and the further expansion of the scale of development and utilization, the production and use costs of new energy are further reduced and the competitiveness is becoming stronger and stronger. It also focuses on the development of clean energy to replace traditional energy;

After the double substitution transformation of "coal to gas" and "coal to electricity" in many industrial enterprises, the cost of energy steam in large-scale enterprises has risen rapidly, and the production cost caused by the rising fuel price has been rising continuously;

At present, the proportion of "abandoning air and light" is high, there is a large amount of intermittent waste heat in industrial process, and the utilization rate is low; The power grid should cut the peak and fill the valley;

The gap problem should be solved when using new energy; The use of steam in industry also needs to solve the problem of continuous high temperature;

The molten salt used by users is treated as hazardous waste, which requires cost, which is a serious waste.

Working principle of molten salt energy storage

Main application materials / equipment: molten salt, molten salt storage tank, molten salt pump, molten salt electric heater and molten salt water heat exchanger.

Intelligent complementary system is adopted for heat storage. Wind power, photovoltaic power and night low power are used as the power supply of molten salt electric heater. Molten salt is heated by molten salt electric heater to store heat.

Exothermic in the heat exchange system, high-temperature molten salt exchanges heat with water to release heat.

As a practical technical way of high-temperature heat storage, molten salt has been widely used at home and abroad, and has played a leading and exemplary role in economy and environmental protection. 

Trough solar collector is an efficient linear focusing solar collector, which is mainly composed of reflector, collector tube, support system, tracking system, heat storage system (heat storage tank and heat storage medium), transmission system and control system. It has the advantages of mature technology, stable structure and easy control. The mirror rotates with the sunlight and can directly convert solar energy into heat energy of 80 ℃ - 550 ℃. It is widely used in solar photothermal power generation, industrial steam, heating and refrigeration, seawater desalination, coal-fired boiler replacement, oil exploitation, facility agriculture, drying of agricultural and sideline products and other fields.

1、 Trough solar heat collection technology and heat storage technology are used to take solar light and heat as heat source, and heat is stored by heat storage tank and molten salt;
2、 Collect industrial waste heat, waste air, waste light, etc. in combination with the actual situation of users,;
3、 Equipped with molten salt heat storage electric boiler to absorb users' low power;

4、 Through the heat release of molten salt, the system can supply power / industrial steam / heating to users.

technological process

Molten salt heat storage cycle

The low-temperature molten salt in the cold salt tank enters the molten salt electric heater through the molten salt pump, heats the molten salt in the electric heater through the intelligent complementary system using wind power, photovoltaic and night low power, and the heated high-temperature molten salt enters the hot salt tank for storage to complete the molten salt heat storage cycle.

Molten salt exothermic cycle

The high-temperature molten salt in the hot salt tank enters the heat exchange system through the molten salt pump to exchange heat with the feed water. The feed water is heated into steam, and the exothermic molten salt enters the cold salt tank for storage to complete the exothermic cycle of molten salt.

Steam / water heat exchange cycle

The steam generated after the water supply is heated exchanges heat with the return water of the circulating water at the heat user's side. After treatment, the condensate after the steam heat exchange can return to the molten salt exothermic cycle for continuous circulation. The circulating water after heat exchange is supplied to the heat user for use. The circulating water after use by the heat user is returned and then exchanged heat with the steam to complete the steam / water heat exchange cycle.


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