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Additive for flue gas desulfurization and denitration and flue gas desulfurization and denitration method

A desulfurization, denitrification and additive technology, which is applied in the field of flue gas desulfurization and denitrification additives and flue gas desulfurization and denitrification, can solve the problems of cumbersome preparation process and low removal efficiency of highly active absorbent, and achieves simple preparation method, simplified process, convenient production effect

Inactive Publication Date: 2013-11-27
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent 200310103954.7 discloses a flue gas desulfurization and denitrification purification method and device. It sprays a highly active absorbent based on fly ash, lime and additives into a circulating fluidized bed reactor to absorb Sulfur dioxide SO in flue gas 2 NO x , and then use the return leg on the dust removal device to send the incompletely reacted highly active absorbent back to the feeding pipe for recycling, but the preparation process of the highly active absorbent in this method is cumbersome and the removal efficiency is low

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  • Additive for flue gas desulfurization and denitration and flue gas desulfurization and denitration method
  • Additive for flue gas desulfurization and denitration and flue gas desulfurization and denitration method
  • Additive for flue gas desulfurization and denitration and flue gas desulfurization and denitration method

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preparation example Construction

[0034] The preparation method of the additive is not particularly limited in the present invention, and it can be obtained by mixing a tetravalent cerium compound and a calcium-based absorbent.

[0035] The present invention also provides a method for flue gas desulfurization and denitrification, comprising the following steps:

[0036] The raw flue gas, water and the additives described in the above technical scheme are fed into the fluidized bed reactor for reaction to obtain purified flue gas.

[0037] The additive provided by the invention is especially suitable for the current common dry circulating fluidized bed method for desulfurization and denitrification. Specifically, adding the additive described in the invention into a circulating fluidized bed reactor can purify flue gas.

[0038] The present invention has no special limitation on the fluidized bed reactor, and a circulating fluidized bed capable of performing dry desulfurization and denitrification well known to...

Embodiment 1

[0049] Mix 56 g of analytically pure ammonium cerium nitrate with a mass percentage >98.5% and 56 mL of concentrated sulfuric acid with a mass percentage of 98% and a density of 1.84 g / mL, add 100 mL of water and stir well, then dilute the resulting solution to 1 L with water , and fully stirred to prepare a 0.1mol / L cerium source solution. Filter out the insoluble matter in the cerium source solution, add 65 mL of analytically pure ammonia water with a mass concentration of 26% and a density of 0.9 g / mL to the filtrate, stir thoroughly, precipitate, filter, and wash until the washing water does not contain NO 3 - . The above preparation process is carried out under the condition of heating in a water bath at 60°C.

[0050] The obtained precipitate was dissolved in concentrated sulfuric acid under the condition of heating in a water bath at 60°C. After the precipitate was completely dissolved, the heating was stopped, the insoluble matter was filtered off, and the obtained f...

Embodiment 2-8

[0052] Calcium hydroxide and tetravalent cerium compound were mixed according to the weight ratio of raw materials shown in Table 1 to obtain additives respectively.

[0053] The raw material ratio of the additive prepared by the embodiment of the present invention 2-8 in table 1

[0054] Example

[0055] In table 1, the tetravalent cerium compound that embodiment 2,4,6 adopts is the ceric sulfate that embodiment 1 prepares; The tetravalent cerium compound that embodiment 3,5,8 adopts is commercially available cerium oxide; Embodiment 7 The tetravalent cerium compound used is commercially available ceric sulfate.

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Abstract

The invention provides an additive for flue gas desulfurization and denitration, which comprises a calcium-based sorbent and a tetravalent cerium compound. The invention also provides a flue gas desulfurization and denitration method. According to the invention, the tetravalent cerium compound is taken as an oxidant, and after the tetravalent cerium compound is mixed with the calcium-based sorbent, the obtained mixture is applied to a flue gas desulfurization and denitration dry process, and then the tetravalent cerium compound and the calcium-based sorbent play roles together in simultaneously removing sulfur dioxide and nitric oxide in flue gas, so that the additive has high simultaneous desulfurization and denitration efficiency and good security and stability. Experimental results show that when the additive comprises 2.3 wt % of the tetravalent cerium compound and 97.7 wt % of calcium hydroxide, the reaction temperature is 50-60 DEG C, and water accounts for 8 wt % of the total mass of the water, flue gas and the additive, the average efficiencies of desulfurization and denitration can respectively reach 98.7% and 61.5%.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to an additive for flue gas desulfurization and denitrification and a method for flue gas desulfurization and denitrification. Background technique [0002] At present, fossil fuels such as coal, oil, and natural gas are still the main energy sources for human beings. During the combustion of fossil fuels, SO 2 and NO x And other pollutants, and the pollutants will form acid rain and other secondary pollutants, seriously affecting human production and life. Therefore, it is very important to control and purify harmful gas pollution such as sulfur dioxide and nitrogen oxides in the flue gas produced by fossil fuel combustion. [0003] The prior art discloses a variety of flue gas desulfurization and denitrification methods, among which, in the flue gas desulfurization technology, wet desulfurization accounts for about 82% of the world market. The advantage is that the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/60
CPCY02A50/20
Inventor 韩颖慧赵毅归毅曹春梅姜根山
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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