Smoke gas catalysis adsorption cooperated demercuration device and method

An absorption device and mercury removal technology, which is applied in the fields of chemical industry, cement, power plant, metal smelting, and petroleum refining, can solve the problems of reduced mercury oxidation capacity, high dependence on chlorine content, difficult conversion, etc., and achieves convenient operation and low cost. , The effect of high mercury removal efficiency

Pending Publication Date: 2017-07-25
BEIJING SPC ENVIRONMENT PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, on the surface of commonly used SCR catalysts, NH 3 Competitive adsorption with Hg on the active center site, NH 3 The adsorption of mercury is often dominant, which can inhibit the adsorption of Hg, and these catalysts are highly dependent on the chlorine content in the flue gas when oxidizing mercury. When there is no chlorine or less chlorine in the flue gas, the mercury oxidation ability of these catalysts is significantly reduced, while the Hg in mercury 0 Compared to Hg 2+ Also more difficult to convert to Hg p , which limit the ability of subsequent dedusting unit and wet absorption unit to synergistically remove mercury

Method used

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  • Smoke gas catalysis adsorption cooperated demercuration device and method
  • Smoke gas catalysis adsorption cooperated demercuration device and method
  • Smoke gas catalysis adsorption cooperated demercuration device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Example 1MnOx / Al 2 O 3 Catalytic mercury removal

[0045] As attached figure 2 As shown, the MnOx / Al prepared by combining the dipping method and the sol-gel method in the flue upstream of the ammonia injection grid 10 2 O 3 Mercury removal catalyst, in which MnOx loading is 10wt%, and the reaction space velocity of mercury removal catalyst is 15000h -1 , HC1 concentration is 20ppm, reaction temperature is 300℃, and the other conditions are the same as the reference case. As a result, the mercury removal rate of the system reaches 90%; image 3 As shown, put MnOx / Al 2 O 3 The mercury removal catalyst is loaded downstream of the denitration catalyst layer 9, wherein the MnOx loading amount is 1wt%, and the mercury removal catalyst reaction space velocity is 5000h -1 , HC1 concentration is 20ppm, reaction temperature is 380°C, and other conditions are the same as in Example 1. As a result, the mercury removal rate of the system reaches 85%.

Embodiment 2

[0046] Example 2CoOx / TiO 2 Catalytic mercury removal

[0047] As attached figure 2 As shown, the upstream flue of the ammonia injection grid 10 is filled with CoOx / TiO produced by the impregnation method 2 Mercury removal catalyst, in which CoOx loading is 5wt%, reaction space velocity is 10000h -1 , HC1 concentration is 20ppm, reaction temperature is 320℃, and other conditions are the same as the reference case. As a result, the mercury removal rate of the system reaches 87%.

Embodiment 3

[0048] Example 3MnOx / Al 2 O 3 Catalytic adsorption synergistic mercury removal

[0049] As attached figure 2 As shown, the MnOx / Al prepared by the combination of the upstream flue filling and dipping method and the sol-gel method of the ammonia injection grid 10 2 O 3 Mercury removal catalyst, in which MnOx loading is 5wt%, reaction space velocity is 10000h -1 , HC1 concentration 20ppm, reaction temperature 320℃, adsorbents are activated carbon and Br-loaded modified activated carbon, the amount of carbon injection is determined by the weight ratio of activated carbon: total mercury in flue gas 5000:1, and the injection amount of modified activated carbon is modified Activated carbon: The weight ratio of total mercury in the flue gas is determined at 1000:1, and the other conditions are the same as the reference case. Results The mercury removal rate of the system reached 91.5% and 92% respectively.

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Abstract

The invention provides a smoke gas demercuration method and device. According to the method, a demercuration catalyst and flue jet adsorption agent cooperated technology is used for efficient demercuration, wherein a demercuration catalyst layer is arranged at the upper stream of a denitration and ammonia spraying grille or / and the lower stream of the smoke gas denitration catalyst layer; adsorption agents are sprayed in the upper stream flue of a dust removing device; most Hg<0> in the smoke gas is converted into Hg<2+> under the effect of the demercuration catalyst and is sufficiently and uniformly mixed with the adsorption agents entering the smoke gas through spraying; reaction adsorption is performed; then, the adsorbed mercury is removed along with particle materials in the dust removal equipment; the unadsorbed mercury is further adsorbed in the absorption device, so that the mercury in the smoke gas can be effectively controlled. The smoke gas demercuration method provided by the invention has the advantages that the process is simple; the operation is convenient; the demercuration rate can reach 94 percent.

Description

[0001] Technical field [0002] The invention relates to a flue gas catalytic adsorption and coordinated mercury removal device and a method thereof, belonging to the fields of power plants, metal smelting, cement, chemical industry, petroleum refining and the like. Background technique [0003] Many air pollutants such as SOx, NOx, dust, mercury, etc. are generated during the combustion and utilization of energy. Among them, mercury, as a heavy metal pollutant, causes significant harm to the environment and human health. Coal-fired power plants, coal-fired industrial boilers, non-ferrous metal smelting, and cement industries are the main sources of mercury emissions in my country, accounting for more than 80% of mercury emissions in the entire industry. [0004] Due to the low chlorine content in coal in our country, most of the mercury in the coal combustion process is the gaseous element mercury (Hg 0 ) Into the flue gas; as the flue gas cools, part of the Hg 0 Interacting with ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/86B01D53/64B01D53/90B01D53/56F23J15/00F23J15/02
CPCB01D53/75B01D53/8631B01D53/8665B01D53/90F23J15/006F23J15/02F23J2219/30B01D2255/2092B01D2255/2073B01D2255/20746B01D2253/102
Inventor 许昌日王语桐郝向宇黄芪程俊峰张开元
Owner BEIJING SPC ENVIRONMENT PROTECTION TECH
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