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A method for quantitatively detecting the concentration of ammonium bisulfate in the fly ash of scr denitrification equipment

A technology for quantitative detection of ammonium bisulfate, applied in the field of chemical detection, can solve the problems of difficult ammonium bisulfate dissolution, low decomposition temperature of ammonium bisulfate, inability to use coal-fired fly ash alkali fusion method or acid fusion method and other problems , to achieve the effect of economical saving

Active Publication Date: 2021-05-07
CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the mutual wrapping and adhesion between fly ash and ammonium bisulfate, it is difficult to completely dissolve ammonium bisulfate by ordinary dissolution and filtration. It is impossible to use the alkali fusion method or acid fusion method in the coal-fired fly ash component analysis method, so it is necessary to explore a suitable dissolution method for ammonium bisulfate to achieve accurate quantitative determination of ammonium bisulfate in fly ash

Method used

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  • A method for quantitatively detecting the concentration of ammonium bisulfate in the fly ash of scr denitrification equipment
  • A method for quantitatively detecting the concentration of ammonium bisulfate in the fly ash of scr denitrification equipment
  • A method for quantitatively detecting the concentration of ammonium bisulfate in the fly ash of scr denitrification equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]Example 1 Effect of Filtration mode on measuring the ammonium sulfate content in fly ash

[0048]Include the following steps:

[0049]Step 1, fly ash sample preparation:

[0050]The pure sulfate sulfate was analyzed to 100 μm or less, and then mixed with fly ash, according to the mass ratio of 1:50, then put it in a constant temperature blast drying tank, temperature treatment at 150 ° C for 8 h, and simulated SCR denitration The environment in the device, naturally cooled to room temperature after the end, the resulting fly ash is dried to constant weight at 45 ° C, cooled to normal temperature, takes 50 g of four-point method, using the agate mortar to crush, over 0.15 MM test screen, spare;

[0051]Step 2, dissolve the flying ash: The analysis of one-pole analysis is accurately praised by two mg flying ash, respectively marked YP-1 and YP-2, and put it in a dry clean high-capped cup, according to the gray The proportion of water ratio 2: 100 is removed from ion water, gently joining th...

Embodiment 2

[0065]Example 2 Effect of agitation mode on measuring the ammonium sulfate content in fly ash

[0066]Include the following steps:

[0067]Step 1, fly ash sample preparation:

[0068]The pure sulfate sulfate was analyzed to 100 μm or less, and then mixed with fly ash, according to the mass ratio of 1:50, then put it in a constant temperature blast drying tank, temperature treatment at 150 ° C for 8 h, and simulated SCR denitration The environment in the device, naturally cooled to room temperature after the end, the resulting fly ash is dried to constant weight at 45 ° C, cooled to normal temperature, takes 50 g of four-point method, using the agate mortar to crush, over 0.15 MM test screen, spare;

[0069]Step 2, dissolve the flying ash: with one-purpose analysis balance accurately weigh three mg flying ash, respectively marked YP-3, YP-4 and YP-5, separately put the dry clean high beaker In the proportion of the gray water ratio 2: 100, the ionized water is removed, and the deionized water is...

Embodiment 3

[0083]Example 3 Effect of ultrasonic time on the content of ammonium sulfate in fly ash

[0084]Include the following steps:

[0085]Step 1, fly ash sample preparation:

[0086]The pure sulfate sulfate was analyzed to 100 μm or less, and then mixed with fly ash, according to the mass ratio of 1:50, then put it in a constant temperature blast drying tank, temperature treatment at 150 ° C for 8 h, and simulated SCR denitration The environment in the device, naturally cooled to room temperature after the end, the resulting fly ash is dried to constant weight at 45 ° C, cooled to normal temperature, takes 50 g of four-point method, using the agate mortar to crush, over 0.15 MM test screen, spare;

[0087]Step 2, dissolve the flying ash: with one-pole analysis of the analysis of 7 parts of Mg flying as ash, respectively, marked as YP-6, YP-7, YP-8, YP-9, YP-10, YP -11 and YP-12, in a dry clean high-capped cup, remove ion water in accordance with the proportion of the gray water ratio 2: 100, gently ...

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Abstract

The invention discloses a method for quantitatively detecting the concentration of ammonium bisulfate in fly ash of SCR denitrification equipment. Due to the mutual wrapping and adhesion between fly ash and ammonium bisulfate, it is difficult to completely remove ammonium bisulfate by ordinary dissolution and filtration. At the same time, due to the low decomposition temperature and alkalinity of ammonium bisulfate, pretreatment methods such as alkali fusion method or acid fusion method in the composition analysis method of coal-fired fly ash cannot be used. The present invention explores a stripping method suitable for ammonium bisulfate. By comprehensively considering factors such as filter membrane pore size, ultrasonic temperature, stripping time, and gray-to-water ratio, the chemical properties of ammonium bisulfate that is easily soluble in water are used to dissolve fly ash into The dissolution of ammonium bisulfate can realize the accurate quantitative determination of ammonium bisulfate in fly ash.

Description

Technical field[0001]The present invention relates to a chemical detecting method, more particularly to a method of quantifying the concentration of sulfate concentration in the fly ash of SCR denitration equipment.Background technique[0002]Selective Catalytic Reduction Denit Technology (SCR) is one of the most effective ways to remove the nitrogen oxides in the flue gas in the coal-fired power plant. It has been widely used at home and abroad, but the ammonia gas escaping during the denitration process is easy to use. SO in the gas3The reaction is formed to form a sulfate fine particulate matter, wherein the ammonium hydrogen sulfate (ABS) is highly viscous at a low temperature zone, and it is adhesive fly ash and deposited in a temperature suitable empty point, causing clogging and corrosion of the empty preservation. The power consumption and exhaust temperature of the fan, greatly reduces the thermal efficiency of the unit, affecting the safety economy of the unit.[0003]Quantita...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N31/16B01D11/02
CPCB01D11/02G01N31/16
Inventor 蒋春晓张达光慕晓炜汪鑫陈皓梁琳琳彭巧玲韦俊梅
Owner CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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