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Dry denitration and SNCR (selective non-catalytic reduction) denitration system and working method thereof

A non-catalytic and selective technology, applied in the field of flue gas denitrification, to achieve the effect of high efficiency and low overall cost

Pending Publication Date: 2018-11-02
易善莉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above problems, the primary purpose of the present invention is to provide a dry denitrification and selective non-catalytic reduction denitrification system with high efficiency, low overall cost, easy operation, no secondary pollution, and national ultra-low emission and its working method , its operation is simple and stable, and it can ensure a high denitrification efficiency and reduce NOx to 100mg / Nm without serious ammonia escape. 3 The following can reduce the cost of denitration agent at the same time

Method used

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  • Dry denitration and SNCR (selective non-catalytic reduction) denitration system and working method thereof
  • Dry denitration and SNCR (selective non-catalytic reduction) denitration system and working method thereof
  • Dry denitration and SNCR (selective non-catalytic reduction) denitration system and working method thereof

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Experimental program
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Effect test

Embodiment 1

[0059] Step 1: take by weight the urea that is 30.0 in parts by mass; the silica powder that is 20.0 in parts by mass; the sodium carbonate that is 30.0 in parts by mass; The shale powder was fully pulverized and ground to obtain the final powder product, and the sample was recorded as A-1.

[0060] Step 2: Melt A-1 at 140°C and drop it through the orifice plate under stirring. During the falling process, it is air-cooled by a fan to solidify it into granules, which are named A-2.

[0061] The specific injection combination method is as follows: for dry denitrification, four first injection ports 41 are arranged in the area where the flue gas temperature is 750°C. For SNCR denitrification, four second injection ports 51 are arranged in the area where the flue gas temperature is 860°C.

[0062] In this embodiment, the denitrification target is divided into two types: the outlet NOx is changed from the initial 350mg / m 3 Reduced to 170mg / m 3 Named as 1-1; export NOx from the i...

Embodiment 2

[0065] Step 1: prepare synergist: under room temperature condition, the sodium cocoyl glycinate of 1.5 parts by mass and the sodium lauryl sulfate of 0.5 part are dissolved in the water of 100.0 parts by mass, add the aqueous phosphoric acid solution of 1.0 parts by mass ( Mass percent concentration is 20.0%), stir evenly. Thereafter, 8.0 parts by mass of ethyl orthosilicate was added. After continuing to stir for 20 minutes, the product was filtered out and dried at 50°C to obtain phosphorylated silica vesicles. Add 100.0 parts by mass of phosphorylated silica vesicles to 1000 parts by mass of an aqueous solution of titanyl sulfate (15.0% concentration by mass) and stir for 20 minutes, then filter and dry at 50°C to obtain synergistic components. The mass percentage content of titanium metal element is: 2.3%.

[0066] Step 2: 100.0 parts by mass of urea, 0.5 parts by mass of polyethylene glycol (molecular weight of 30000), 5.0 parts by mass of sodium A molecular sieve, and...

Embodiment 3

[0072] Step 1: Weigh 42.9 parts by mass of potassium hydroxide and 228.3 parts by mass of distilled water into the reaction kettle to make a potassium hydroxide solution; and keep the reaction kettle at 0 ° C ~ 4 ° C under ice bath and stirring state to slowly dissolve the mass Add 45.7 parts of acrylic acid and 54.3 parts of methacrylic acid to the above potassium hydroxide solution, then add 0.041 parts by mass of potassium persulfate and 0.027 parts by mass of N,N'-methylenebisacrylamide, and continue stirring for 30 minutes , heated to 75°C for 90 minutes until the mixture polymerized. Then the polymer was dried at 70° C. for 5 hours, and the synergistic polymer was obtained by pulverization.

[0073] Step 2: Ammonium bicarbonate that is 5.0 parts by mass, ammonium carbonate that is 5.0 parts by mass, urea that is 38.3 parts by mass, melamine that is 45.0 parts by mass and the above-mentioned synergistic polymer that is 6.7 parts by mass are fully crushed and ground A pow...

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Abstract

The invention discloses a dry denitration and SNCR (selective non-catalytic reduction) denitration system and a working method thereof with high efficiency, low comprehensive cost, easy operation, nosecondary pollution, and meeting the national ultra-low emission standards, the dry denitration and SNCR denitration are used in combination for denitration. Specifically, the dry denitration agent issprayed into the flue gas at a temperature range of 750 DEG C to 970 DEG C, and the SNCR liquid denitration agent is sprayed into the flue gas at the temperature range of 860 DEG C to 1050 DEG C; theoperation is simple and stable, higher denitration efficiency is ensured without causing severe ammonia escape, and the cost of the denitration agent can be reduced while reducing the NOx to 100 mg / Nm<3> or less.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and in particular relates to a dry denitrification and selective non-catalytic reduction denitrification system for high-temperature flue gas and a working method thereof. Background technique [0002] At present, there are two main ways to reduce flue gas emissions: 1. Selective non-catalytic reduction (SNCR) process. SNCR technology is a relatively mature technology. This method is usually at 860 ~ 1050 ° C, the reducing agent is usually ammonia or urea sprayed into the flue gas, reduced to generate nitrogen and water. The principle is to drive the selective reduction reaction of ammonia and NOx through high temperature, so the denitrification efficiency is significantly lower than that of SCR. This is currently the lowest cost method for denitrification using chemicals. However, the current situation is that except for circulating fluidized bed furnaces, for other combustio...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/79B01D53/56B01D53/81
CPCB01D53/56B01D53/565B01D53/75B01D53/79B01D53/81B01D2258/0283
Inventor 易善莉
Owner 易善莉
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