Flue gas pollutant combination removal method based on high-activity solid absorbent

A technology of combined removal and absorbent, applied in the field of combined removal of flue gas pollutants, industrial kilns, and coal-fired industrial boilers, can solve the problems of low nitrogen oxide removal efficiency, cumbersome procedures, nozzle blockage, etc. The effect of low operating and equipment cost and high life expectancy

Inactive Publication Date: 2018-05-08
CHINA COAL RES INST CCRI ENERGY SAVING TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The patent with the publication number CN104474857A discloses a method and device for pre-oxidizing active molecules to absorb NO and SO2 in coal-fired flue gas. The strong oxidizing property of active molecular ozone is used. Higher, but the water consumption is large and the waste liquid treatment process is more complicated
[0004] Publication No. CN105056749A patent discloses a method for simultaneously removing nitrogen oxides and sulfur oxides in flue gas. This patent utilizes the catalytic oxidation of NO by a calcium-based desulfurizer, but actual industrial tests have found that the catalytic oxidation efficiency is not High, resulting in low denitrification rate, this patent also mentions that the removal rate of NOx i

Method used

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  • Flue gas pollutant combination removal method based on high-activity solid absorbent

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example 1

[0048] In the tail flue section of the boiler at a temperature of 120°C, spray high-concentration ozone and mix it evenly with the flue gas, O 3 The / N molar ratio is 0.6, and the residence time is 0.5s; NO and zero-valent mercury in the flue gas are oxidized to high-valence nitrogen oxides and mercury compounds.

[0049] After activation, wet solid particles (dust-containing flue gas is dedusted to obtain clean flue gas, solid particles collected at the bottom of the dust collector are sent to the storage bin, part of the solid particles enter the activator through the conveying device, and are sprayed into a certain amount of process Atomized water or steam is used to activate it. The activated material enters the humidification mixer and sprays a certain amount of process atomized water (humidification) into the reactor to quickly reduce the temperature of the flue gas to 70 ° C and combine with the oxidation After the flue gas is in full contact with the SO 2 , SO 3 , Hi...

example 2

[0051] Other steps are the same as Example 1, except that the solid particle humidification is changed into two stages of humidification (the wet solid particles after activation enter the reactor, and the temperature of the flue gas is rapidly reduced to 80 ° C, which is suitable in the middle of the reactor. Spray a small amount of process atomized water into the position for secondary humidification, and the temperature of the flue gas is further reduced to 70°C), SO 2 The removal rate is 92%, and the NO removal rate is 82%.

example 3

[0053] Other steps are the same as example 2, a small amount of process water that is sprayed into the middle of the reactor is replaced with a concentration of 80% NaClO solution. It not only plays the role of humidification, but also can continue to oxidize the fully oxidized NO and Hg in the reactor, further improving the absorption rate. SO 2 The removal rate is 92%, and the NO removal rate is 85%.

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Abstract

The invention provides a flue gas pollutant combination removal method based on a high-activity solid absorbent. The flue gas pollutant combination removal method comprises: uniformly mixing an oxidant into boil tail flue gas to obtain oxidized flue gas, wherein the NO in the flue gas is oxidized into a high-valence nitrogen oxide, and the zero-valence mercury is oxidized to a high-valence mercuride; making the oxidized flue gas completely contact solid particles, and simultaneously removing the sulfur oxide, the high-valence nitrogen oxide and the high-valence mercuride in the flue gas so asto obtain pollutant-removed dust-containing flue gas; and carrying out dust removing on the dust-containing flue gas to obtain clean flue gas, wherein the solid particles collected from the bottom portion of a dust removing device are fed into a material storage bin, the partial solid particles are activated and humidified, the activated and humidified solid particles returns to the reactor so asto continuously participate in the reaction, and the remaining solid particles are discharged from the bottom portion of the material storage bin so as to maintain the material balance. According to the present invention, the semi-dry absorption method is used, wherein the calcium-based absorbent is sprayed into the reactor in the form of the humidified solid particles, such that the water consumption is low, the final product is the solid-state product, the treatment of the wastewater is not required, the process is simple, and the method can be widely used in the industrial flue gas treatment.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for combined removal of flue gas pollutants based on a high-activity solid absorbent, which is suitable for coal-fired industrial boilers and industrial kilns. Background technique [0002] At present, environmental protection standards are becoming increasingly strict, but small and medium-sized industrial boilers and industrial kilns often have the characteristics of small capacity, high pollutant concentration, small site, and difficult pollutant treatment, which makes treatment and transformation difficult. Compared with the low emission of large-scale power plant boilers, intensive, compact, and integrated dust removal, desulfurization, and denitrification collaborative removal technologies are the development direction of low-emission industrial boilers. [0003] The patent with the publication number CN104474857A discloses a method and device for ...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/76B01D53/81B01D53/50B01D53/60B01D53/64
CPCB01D53/508B01D53/60B01D53/64B01D53/75B01D53/76B01D53/81B01D2251/10B01D2251/104B01D2251/106B01D2251/304B01D2251/402B01D2251/404B01D2258/0283Y02A50/20
Inventor 李婷张鑫尚庆雨王乃继肖翠微刘振宇王永英崔豫泓梁兴程晓磊陈隆杨石牛芳李小炯徐大宝罗伟于清航杨晋芳周沛然王实朴郑祥玉刘建航韩崇刚
Owner CHINA COAL RES INST CCRI ENERGY SAVING TECH CO LTD
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