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Low-temperature flue gas SCR denitration and tungsten, vanadium and titanium comprehensive recovery method

A technology of low-temperature flue gas and SCR catalyst, which is applied in the field of air pollution control, can solve the problems of high yield recovery and other problems, and achieve the effects of low equipment requirements, short process flow and low cost

Inactive Publication Date: 2017-03-22
DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can effectively improve the denitration efficiency and save costs in the flue gas denitration process, but the high yield recovery of vanadium, tungsten and titanium in the post-denitration treatment is a relatively difficult problem to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for low-temperature flue gas SCR denitrification and comprehensive recovery of tungsten, vanadium and titanium, comprising the following steps:

[0029] (1) Pass the coke oven flue gas into the bag filter for dust removal;

[0030] (2) The liquid ammonia in the liquid ammonia storage tank is sent to the evaporation tank, after the liquid ammonia is evaporated into ammonia gas in the evaporation tank, it is sent into the ammonia gas dilution tank, and the ammonia gas in the ammonia gas dilution tank is diluted with air Formation of ammonia-air mixture;

[0031] (3) The flue gas and the ammonia-air mixture after the above-mentioned dedusting are passed into the denitration reactor respectively, and the SCR catalyst in the denitration reactor is heated, and the NOx in the flue gas and the ammonia-air mixture Under the catalysis of the SCR catalyst, the generated nitrogen and water vapor are discharged from the denitration reactor along with the denitration flue g...

Embodiment 2

[0036] A method for low-temperature flue gas SCR denitrification and comprehensive recovery of tungsten, vanadium and titanium, comprising the following steps:

[0037] (1) Pass the coke oven flue gas into the bag filter for dust removal;

[0038] (2) The liquid ammonia in the liquid ammonia storage tank is sent to the evaporation tank, after the liquid ammonia is evaporated into ammonia gas in the evaporation tank, it is sent into the ammonia gas dilution tank, and the ammonia gas in the ammonia gas dilution tank is diluted with air Formation of ammonia-air mixture;

[0039] (3) The flue gas and the ammonia-air mixture after the above-mentioned dedusting are passed into the denitration reactor respectively, and the SCR catalyst in the denitration reactor is heated, and the NOx in the flue gas and the ammonia-air mixture Under the catalysis of the SCR catalyst, the generated nitrogen and water vapor are discharged from the denitration reactor along with the denitration flue g...

Embodiment 3

[0044] A method for low-temperature flue gas SCR denitrification and comprehensive recovery of tungsten, vanadium and titanium, comprising the following steps:

[0045] (1) Pass the coke oven flue gas into the bag filter for dust removal;

[0046] (2) The liquid ammonia in the liquid ammonia storage tank is sent to the evaporation tank, after the liquid ammonia is evaporated into ammonia gas in the evaporation tank, it is sent into the ammonia gas dilution tank, and the ammonia gas in the ammonia gas dilution tank is diluted with air Formation of ammonia-air mixture;

[0047] (3) The flue gas and the ammonia-air mixture after the above-mentioned dedusting are passed into the denitration reactor respectively, and the SCR catalyst in the denitration reactor is heated, and the NOx in the flue gas and the ammonia-air mixture Under the catalysis of the SCR catalyst, the generated nitrogen and water vapor are discharged from the denitration reactor along with the denitration flue g...

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Abstract

The invention discloses a low-temperature flue gas SCR denitration and tungsten, vanadium and titanium comprehensive recovery method. The method comprises the following steps: firstly, coke oven flue gas is subjected to dust removal, and then the dust-removed coke oven flue gas and mixed gas of ammonia gas and air are respectively introduced into a denitration reactor to react under the catalysis of a SCR catalyst at a certain temperature, the generated nitrogen and water vapor are discharged out of the denitration reactor along with the denitrated flue gas, and the waste SCR catalyst after reaction is crushed and ground, and reacts with aluminum powder and calcium oxide powder at 1520-1580 DEG C in an electric arc furnace to prepare titanium-aluminum-based intermetallic compound. The method is simple to operate, high in denitration efficiency, high in recovery rate of valuable metal such as tungsten, vanadium and titanium and capable of saving the cost.

Description

[0001] Technical field: [0002] The invention relates to the field of air pollution control, in particular to a method for low-temperature flue gas SCR denitrification and comprehensive recovery of tungsten, vanadium and titanium. [0003] Background technique: [0004] Coal-fired power plants produce a large amount of dust, SOx, NOx and harmful metal elements in the production process. At present, the control methods for NOx produced by combustion in my country mainly include three types: pre-combustion control, combustion control and post-combustion control. Pre-combustion control refers to the selection of low-nitrogen fuel, but the cost is high and there are few engineering applications. Combustion control refers to improving the combustion mode and production process, adopting low-NOx combustion technology, and reducing the amount of NOx generated in the furnace. This method is relatively low in cost, but due to the limitations of the low-nitrogen combustion technology i...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56C22B7/00C22B34/36C22B34/22C22B34/12
CPCB01D53/8628B01D2251/2062B01D2255/40B01D2258/0283C22B7/001C22B34/1218C22B34/225C22B34/365
Inventor 李风浪李舒歆
Owner DONGGUAN LIANZHOU INTPROP OPERATION MANAGEMENT CO LTD