A low-chlorine photothermal molten salt production process and production device

A production process and molten salt technology, which are applied in the field of low-chlorine photothermal molten salt production process and production devices, can solve the problems of high manufacturing cost, the chlorine content cannot meet the requirements of molten salt products, and the production cannot be stabilized, and the equipment can be reduced. Corrosion, the effect of shortening the reaction residence time

Active Publication Date: 2020-07-21
CHINA CHENGDA ENG
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  • Claims
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Problems solved by technology

[0014] 1. It is mainly used for the production of disodium (sodium nitrite / sodium nitrate=1~2:1) and the technology is mature, but the technology for producing sodium nitrate alone is not yet mature.
[0015] 2. In normal pressure and low pressure operation, large-scale is difficult (the scale of two sodium is 120,000 tons / year, and the largest scale of sodium nitrate is 80,000 tons / year, consisting of 4 production lines, that is, each production line is only 20,000 tons / year sodium nitrate scale)
[0017] 4. Exhaust gas NO x The emission is 600-800ppm, and the tail gas still needs to be treated to meet the emission standards
[0019] 6. Sodium nitrite produced is a toxic substance
[0020] 7. High energy consumption
[0027] 1. At present, the domestic process technology is relatively backward, the neutralization reaction part is non-continuous production, and the tail gas produced is untreated
[0028] 2. The product quality is poor, and the chlorine content cannot meet the requirements of molten salt products
The disadvantage is that the concentration of potassium nitrate in the exchange liquid is low, and the cost of evaporation is high; the concentration of recovered ammonium chloride is low, and the energy consumption of evaporation is high; the requirements for equipment materials are high, and titanium, titanium-molybdenum-nickel alloy or other materials are required, and the manufacturing cost is high.
At the same time, judging from the operation of the domestically built devices, the technology is not mature enough to produce stably

Method used

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  • A low-chlorine photothermal molten salt production process and production device
  • A low-chlorine photothermal molten salt production process and production device
  • A low-chlorine photothermal molten salt production process and production device

Examples

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preparation example Construction

[0070] a) Preparation of molten salt solution: the alkaline liquid and nitric acid solution are sent into the neutralization reactor as raw materials, and the neutralization reactor adopts a spray tube reactor structure with a static mixer, and the alkaline liquid and the The nitric acid solution is directly subjected to continuous neutralization reaction in the ejector and static mixer, and the steam generated by the neutralization reaction is used for heat recovery and used in the evaporation and crystallization process; among them, the raw material of the alkali liquid can be directly obtained from the alkali liquid device Obtain, nitric acid solution raw material can obtain from dilute nitric acid plant, described alkali liquid is sodium hydroxide or potassium hydroxide solution, and the reaction process of described alkali liquid and nitric acid solution in the neutralization reactor is an exothermic reaction, The operating pressure is 1bar(a)~4bar(a), the operating temper...

Embodiment 1

[0080] process such as Figure 5 Shown: the nitric acid solution (55%wt~65%wt concentration) in the dilute nitric acid tank is pumped in the eductor of the neutralization reactor through the dilute nitric acid pump, simultaneously the sodium hydroxide solution (32 % concentration) is pumped into the heat exchanger by the lye pump to preheat the lye and then added to the injector unit of the neutralization reactor, and the dilute nitric acid solution and sodium hydroxide solution in the injector unit of the neutralization reactor are added in molar ratio Add after 1:1 metering, dilute nitric acid solution and sodium hydroxide solution are mixed in the injector unit and static mixer unit of the neutralization reactor and neutralize to generate sodium nitrate, the operating pressure is 1bar(a)~4bar (a), the operating temperature is about 103°C to 130°C, and the pH value is controlled at 6.5-7.5; the generated sodium nitrate and the generated water vapor enter the separator of the...

Embodiment 2

[0086] process such as Figure 5 Shown: the nitric acid solution (55%wt~65%wt concentration) in the dilute nitric acid tank is pumped into the ejector unit of the neutralization reactor through the dilute nitric acid pump, and the potassium hydroxide solution ( 32% or so concentration) is pumped into the heat exchanger to preheat the lye through the lye pump and then added to the injector unit of the neutralization reactor, and the dilute nitric acid solution and potassium hydroxide solution in the injector unit of the neutralization reactor are added by mole Add after metering at a ratio of 1:1, dilute nitric acid solution and potassium hydroxide solution are mixed in the neutralization reactor injector unit and static mixer unit and undergo neutralization reaction to generate potassium nitrate, the operating pressure is 1bar (a) ~ 4bar (a), the operating temperature is about 103°C to 130°C, and the pH value is controlled at 6.5-7.5; the generated potassium nitrate and the ge...

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Abstract

The invention discloses a low-chloride photothermal molten salt production process and production device. The production process comprises the steps that a, molten salt solution preparation is performed: alkaline liquid and a salpeter solution are used as raw materials to be fed into a neutralizing reactor for neutralization reaction; steam generated through neutralization reaction is subjected toheat recovery; b, a certain concentration of neutralization solution obtained through neutralization reaction is treated by an evaporative crystallization work procedure to obtain molten salt crystals; c, the molten salt crystals are subjected to centrifugal separation and drying to obtain products; centrifugal mother liquid returns to front end work procedures. The alkaline solution is used as raw materials for producing high-quality molten salt; a jet pipe type reactor with a static mixer is used for neutralization reaction; the molten salt solution obtained after the neutralization is usedfor producing solids by evaporation concentration, crystallization or slurry praying drying methods; after the subsequent treatment and package, the solids are used as final molten salt products; thechlorine content can be lower to be 15 to 20 ppm; the corrosion of molten salt products on user equipment can be reduced, so that the service life of equipment is prolonged; the long-period safe operation of a solar photothermal power generation device is ensured.

Description

technical field [0001] The invention belongs to the technical field of photothermal molten salt, and in particular relates to a production process and production device of low-chlorine photothermal molten salt. Background technique [0002] At present, domestic solar thermal power generation is a large-scale utilization of high-temperature thermal energy of solar energy. It can not only reduce the use of fossil fuels, but also achieve the purpose of reducing greenhouse gas emissions and reducing air pollution. It is a rapidly emerging emerging industry. Among them, nitric acid Molten salt series is the most widely used molten salt in this industry, which is suitable for high-temperature thermal power generation of concentrated solar energy. Due to the very strict requirements on the quality of molten salt products in the field of photothermal molten salt, it is also the reason why this technology is proposed. [0003] The components of photothermal molten salt products at h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/04
CPCC01D9/04C01P2006/80Y02P20/10
Inventor 黄泽茂曾纪龙邓敏郭和刚李瑞峰徐秀海冯小杰
Owner CHINA CHENGDA ENG
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