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Method for removal of sulfur and nitrogen oxides in smoke

An oxide and flue gas technology, applied in the field of nitrogen oxides and sulfur removal in flue gas, can solve problems such as large performance loss, and achieve the effect of recovery and improvement and improvement of use efficiency

Active Publication Date: 2014-05-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although as pointed out by Chen Ying et al., La-Cu-Na-γ-Al 2 o 3 It has good recycling performance, but the synchronous SO removal of the regenerated composition 2 and NO performance loss is still large

Method used

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  • Method for removal of sulfur and nitrogen oxides in smoke

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Raw material: γ-Al 2 o 3 Carrier, spherical shape, average particle size 1.3 mm, product of Changling Catalyst Factory. Na 2 CO 3 , Cu(NO 3 ) 2 , La(NO 3 ) 3 All are products of Beijing Chemical Plant.

[0042] Preparation method: weigh 8.5 grams of Na 2 CO 3 , 15.8 g Cu(NO 3 ) 2 and 12.4 g La(NO 3 ) 3 Dissolve 100ml of solution with deionized water, impregnate 100g of γ-Al with this solution at room temperature 2 o 3 The carrier was dried for 2 hours at 110° C. for 12 hours and calcined at 950° C. for 10 hours to obtain the composition SORB-1 of the present invention.

[0043] Composition of SORB-1: the loading of each component is represented by Na 2 CO 3 , CuO and La 2 o 3 Calculated, the content of sodium is 8% by weight, the content of copper is 5% by weight, and the content of lanthanum is 5% by weight (the content of metal components is analyzed by X-ray fluorescence spectrometry, the same below).

Embodiment 2

[0045] Raw material: γ-Al 2 o 3 Carrier (with embodiment 1); Ba(NO 3 ) 2 , La(NO 3 ) 3 , 50% by weight of Mn(NO 3 ) 2 The solutions are all products of Beijing Chemical Plant.

[0046] Preparation method: 1.7 grams of Ba(NO 3 ) 2 Dissolve 100 ml of solution L1 with deionized water, and dissolve 10 g of La(NO 3 ) 3 and 54.2 g Mn(NO 3 ) 2 The solution was dissolved in deionized water to make 100 ml of solution L2. Sequentially impregnate 100 grams of γ-Al with L1 and L2 2 o 3 The carrier was impregnated for 2 hours, dried at 110°C for 12 hours after each impregnation, and calcined at 900°C for 10 hours to obtain the composition SORB-2 of the present invention.

[0047] Composition of SORB-2: the loading of each component is based on BaO, MnO 2 and La 2 o 3 In total, the content of Ba was 1% by weight, the content of manganese was 13% by weight, and the content of lanthanum was 4% by weight.

Embodiment 3

[0049] Raw materials: silica carrier, spherical, with an average particle size of 1.22 mm, product of Changling Catalyst Factory; Mg(NO 3 ) 2 , Cr(NO 3 ) 3 All are products of Beijing Chemical Plant.

[0050] Except that the calcination temperature is 800°C, other preparation methods are the same as in Example 1. The composition of the preparation is based on Cr 2 o3 , MgO, the content of chromium is 1% by weight, and the content of magnesium is 19% by weight Composition SORB-3.

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Abstract

The invention discloses a method for the removal of sulfur and nitrogen oxides in smoke, comprising the steps: the smoke containing sulfur and nitrogen oxides comes into contact with an adsorbent on condition of adsorption separation and the adsorbent contacting with the smoke containing sulfur and nitrogen oxides is then subject to regeneration, the method is characterized in that, the regeneration is performed according to the method comprising the following steps: (1) at the temperature ranging from 200 to 800 DEG C, the composite to be regenerated comes into contact with reducing gas for 0.5 to 5 hours; (2) at the temperature ranging from 200 to 800 DEG C, the product resulted from the step (1) comes into contact with oxygen-containing gas for 0.5 to 3 hours; and (3) at the temperature ranging from 200 to 800 DEG C, the product resulted from the step (2) comes into contact with the reducing gas for 0.5 to 5 hours once again. Compared with the prior art, the method according to the invention is obviously enhanced in the recovery of sulfur and nitrogen removal performance after the regeneration of the adsorbent, thereby further prominently improving the use efficiency of the adsorbent.

Description

technical field [0001] The invention relates to a method for removing sulfur and nitrogen oxides in flue gas. Background technique [0002] Atmospheric sulfur oxide SOx (more than 95% is SO 2 ), nitrogen oxides NOx (more than 90% are NO) pollution problems are becoming more and more serious, and the flue gas produced by fuel combustion, metal smelting, etc. is the main source of SOx and NOx. These harmful gases cause serious damage to the ecological environment and human health. [0003] At present, the SOx emission control technology in the world is relatively mature. Although a series of researches have been carried out at home and abroad on the NOx emission control, the results are still not satisfactory. [0004] US6521559 discloses a columnar clay catalyst suitable for utilizing NH 3 Selective Catalytic Reduction (SCR) for reducing NO. The characteristics of this catalyst are mainly the introduction of metal oxides such as V in the middle of the clay layer 2 o 5 ,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/94B01D53/60B01J23/83B01J37/12B01J37/18
CPCY02A50/20
Inventor 杜冰宗保宁罗一斌王维家
Owner CHINA PETROLEUM & CHEM CORP