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Dry-type deep flue gas desulfurization and denitration integrated method taking manganese hydroxide as circulating work medium

A technology of manganese hydroxide and cyclic work, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of potential safety hazards, high cost of desulfurization and denitrification, low resource utilization, etc., and achieve power and heat consumption costs Low cost, improved resource utilization, and convenient cycle operation

Active Publication Date: 2017-06-20
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the disadvantages of low resource utilization, high cost of desulfurization and denitrification, and potential safety hazards in the prior art, the present invention provides a method using manganese hydroxide Mn(OH) 2 The flue gas deep desulfurization and denitrification dry integrated method for circulating working medium can fundamentally solve the above difficulties and problems

Method used

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  • Dry-type deep flue gas desulfurization and denitration integrated method taking manganese hydroxide as circulating work medium

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Effect test

Embodiment 1

[0064] A dry-type integrated method for flue gas desulfurization and denitrification using manganese hydroxide as a circulating working medium, comprising the following steps:

[0065] 500mL50% manganese nitrate Mn(NO 3 ) 2 The aqueous solution was diluted with water to 2000mL and heated to 85°C, and 150g of Ca(OH) was gradually added to it 2After stirring and reacting for 2 hours, filter and wash, get 350 grams of manganese hydroxide filter cake (water content 60%) and dry at 105°C, grind, put into a 250mL absorption bottle, and the solid height in the bottle is 100mm. Put the solid manganese hydroxide together with the absorption bottle into an oil bath at 110°C-150°C. Pass the preheated simulated flue gas into the absorption bottle at a speed of 7L / min, the composition of the simulated flue gas is: O 2 5%, SO 2 2200mg / m 3 , NO x 502mg / m 3 , the rest is nitrogen N 2 .

[0066] When the adsorption reaction lasted for 10 minutes, the gas outlet temperature of the a...

Embodiment 2

[0072] Take instance 1 and pass into SO 2 29.6g, 100g of manganese oxide with NOx5.7g, dissolved in 350mL water, heated to 85°C, added 32gNaOH in batches, the pH value of the solution was 11, stirred and reacted for 2 hours, vacuum filtered and washed; The cake is dried at 105°C, and the remaining 1 / 3 of the wet filter cake is mixed with the dried part, and put into an absorption bottle with a solid height of 80mm. Put the manganese oxide solid together with the absorption bottle into the oil bath at a speed of 7L / min Pass the preheated simulated flue gas into the absorption bottle, the simulated flue gas composition is: O 2 5.8%, SO 2 2010mg / m 3 , NO x 487mg / m 3 , the rest is nitrogen N 2 .

[0073] When the adsorption reaction lasted for 10 minutes, the gas outlet temperature of the absorption bottle was 140°C, and the outlet gas SO was measured 2 0 mg / m 3 , NO x 46.2 mg / m 3 , the calculated desulfurization efficiency is 100%, and the denitrification efficiency...

Embodiment 3

[0079] Take instance 2 and pass into SO 2 25g, NO x 120g of 4.3g of manganese oxide was dissolved in 300°C of water, heated to 85°C, 80mL of 25% ammonia water was added in batches, the pH of the solution was 10..5, and after stirring for 2 hours, vacuum filtration and washing were performed; 2 / 3 The filter cake is dried at 105°C, and the remaining 1 / 3 of the wet filter cake is mixed with the dried part, and put into an absorption bottle with a solid height of 83mm. Pass the preheated simulated flue gas into the absorption bottle at a high speed, and the simulated flue gas composition is: O 2 6.8%, SO 2 1893mg / m 3 , NO x 472mg / m 3 , the rest is nitrogen N 2 .

[0080] When the adsorption reaction lasted for 10 minutes, the gas outlet temperature of the absorption bottle was 135°C, and the outlet gas SO was measured 2 3mg / m 3 , NO x 53.7mg / m 3 , the calculated desulfurization efficiency is 99.8%, and the denitrification efficiency is 88.6%.

[0081] When the adsorpti...

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Abstract

The invention discloses a dry-type deep flue gas desulfurization and denitration integrated method taking manganese hydroxide as a circulating work medium. The method comprises the steps of replenishing a reactor, containing the manganese hydroxide, with flue gas; enabling the manganese hydroxide to react with oxygen in the flue gas at the temperature within a temperature range of 160-50 DEG C so as to generate manganese oxide MnOx (x is more than 1 and less than or equal to 2); meanwhile, enabling the manganese hydroxide to absorb SO2 and NOx in the flue gas and immediately react with the SO2 and the NOx to generate manganese sulfate and manganese nitrate; enabling an alkaline substance to react with the manganese sulfate and the manganese nitrate which are dissolved in water so as to prepare manganese hydroxide again for circulating desulfurization and denitration, wherein the by-products such as sulfate and nitrate produced in the regeneration reaction are useful chemical products. The method can be used for completely removing the SO2 in the flue gas only by using alkaline raw materials such as lime having wide sources and low price, and has the NOx removal rate of 90% or above; the by-products of the method are sulfate and nitrate products which are marketable, so that economic benefit is obtained; furthermore, a recycling and economic dry-type desulfurization and denitration process route is added for the clean utilization of fossil fuel and the atmospheric environment protection.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization and denitrification, and relates to the removal of sulfur dioxide, SO2 2 and all industries and fields of nitrogen oxide NOx, specifically involving a kind of manganese hydroxide Mn(OH) 2 A flue gas deep desulfurization and denitrification dry-type integrated method and device for circulating working medium. Background technique [0002] Flue gas produced by burning fossil fuels such as coal, oil, and natural gas at high temperature, containing sulfur dioxide SO 2 And acidic substances such as nitrogen oxides NOx, after years of continuous efforts, lime (stone) and magnesium oxide are generally used as desulfurizers at home and abroad to reduce sulfur dioxide SO in flue gas 2 More than 95% is removed; Lime (stone) has a wide range of sources, and the by-products of desulfurization have many impurities and low utilization value, and many places become industrial waste. Adding re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/81B01D53/60B01D53/96B01D53/56B01D53/50B01D50/00C01D9/00C01F11/36C01F11/46
CPCB01D53/508B01D53/565B01D53/60B01D53/81B01D53/96C01D9/00C01F11/36C01F11/46B01D2258/0283B01D2251/602B01D2251/604B01D50/20Y02A50/20
Inventor 陈学玺陈春光朱超越韩香莲
Owner QINGDAO UNIV OF SCI & TECH
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