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Heat transfer and heat storage molten salt for clean energy boiler, preparation method and application thereof

A clean energy, molten salt technology, applied in thermal storage equipment, lighting and heating equipment, chemical instruments and methods, etc., can solve the problems of increased thermal insulation maintenance costs, low thermal conductivity, small latent heat of fusion, etc., and achieve good heat transfer. and heat storage performance, low melting point, low cost of raw materials

Inactive Publication Date: 2019-05-21
QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The nitrate system has the disadvantages of small latent heat of fusion and low thermal conductivity
[0003] In the existing technology, people try to add other components to the nitric acid molten salt system to solve the above problems, but while the upper limit temperature of the improved nitric acid molten salt system is increased, the lower limit operating temperature is also increased, resulting in heat preservation during cloud cover. Increased maintenance costs

Method used

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  • Heat transfer and heat storage molten salt for clean energy boiler, preparation method and application thereof
  • Heat transfer and heat storage molten salt for clean energy boiler, preparation method and application thereof
  • Heat transfer and heat storage molten salt for clean energy boiler, preparation method and application thereof

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Embodiment 1-25

[0052] Embodiment 1-25. Preparation and detection of composite molten salt of the present invention

[0053] Step 1. Prepare this composite molten salt:

[0054] (1) take by weighing KNO according to the composition of the composite molten salt of table 1 3 、NaNO 2 and Ca(NO 3 ) 2 4H 2 Weigh the required Ca(NO 3 ) 2 4H 2 O is put into the corundum crucible, mix and stir;

[0055] (2) Put the mixed molten salt in an oven, heat and stir at 50°C for 12 hours, heat at 80°C and stir for 10 hours, heat at 120°C and stir for 8 hours, heat and stir at 150°C until the composite molten salt becomes a uniform solution system;

[0056] (3) Put the composite molten salt in a muffle furnace at 200-250°C and keep it warm for 8-12 hours to remove Ca(NO 3 ) 2 4H 2 The crystallization water in O; after the crystallization water is evaporated and removed, continue to heat up to 350°C to completely remove the water in the molten salt, and after cooling, a solid uniform system compos...

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Abstract

The invention discloses a heat transfer and heat storage molten salt for a clean energy boiler, a preparation method and the application thereof, and relates to a clean energy technology. The molten salt is characterized by being prepared from the following raw materials in percentage by weight: 20-50% of KNO3, 5-30% of NaNO2, and 30-60% of Ca(NO3)2.4H2O. The composite molten salt has a low melting point and good heat stability, has a saturated vapor pressure less than 2 atm, and can effectively transfer heat and store heat.

Description

technical field [0001] The invention relates to a heat transfer and heat storage medium, in particular to a heat transfer and heat storage molten salt used in a clean energy boiler, a preparation method and an application thereof. Background technique [0002] At present, in the field of industrial energy storage and high-temperature solar heat utilization, the nitric acid molten salt system used for heat transfer and heat storage medium mainly includes binary Solar Salt molten salt and ternary Hitec molten salt system. Among the two molten salt systems, the binary nitrate system has stable performance, does not burn, and has no explosion hazard, but its melting point is relatively high, the working temperature range is narrow, the cold start-up process of the unit is complicated, the heat consumption is large, and the system maintenance cost is high. . Although the existing ternary nitrate system has a relatively low melting point, its upper limit service temperature is al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06F28D20/00
CPCC09K5/06F28D20/00Y02E60/14Y02P20/10Y02P20/129
Inventor 曾智勇崔小敏徐慧芬聂海宁
Owner QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD