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Synergistic purification composite absorbent for ceramic smoke multiple pollutants as well as preparation method and application

An absorbent and pollutant technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of inability to meet the requirements of multi-pollution purification of flue gas, many processing units, and large floor space, and achieves a large footprint. The effect of small land area, high removal efficiency and low production cost

Active Publication Date: 2012-01-04
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned process can effectively remove various pollutants, there are many problems in this process, such as many processing units, complex process, large area, high cost and troublesome management, etc., which is not suitable for my country's national conditions.
With the promulgation and implementation of my country's "Ceramic Industry Pollutant Discharge Standard" (GB25464-2010) on October 1, 2010, the country's main pollutants in the ceramic industry, dust, SO 2 , NO X , fluoride, chloride, heavy metals and other emissions are strictly limited, the existing boiler flue gas control technology can no longer meet the multi-pollution purification requirements of my country's ceramic flue gas, and the foreign single pollution joint control technology is not suitable for my country's national conditions, so Urgent need to develop new ceramic flue gas multi-pollutant control technology

Method used

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  • Synergistic purification composite absorbent for ceramic smoke multiple pollutants as well as preparation method and application
  • Synergistic purification composite absorbent for ceramic smoke multiple pollutants as well as preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The total flue gas of two roller kilns in a ceramics factory is 40,000 m 3 / h, the measured dust concentration in the flue gas before purification is 700-1000mg / m 3 , SO 2 The concentration is 1900~2500mg / m 3 , NO X The concentration is 600~850mg / m 3 , the concentration of fluoride (calculated as HF) is 60~85mg / m 3 , the concentration of chloride (calculated as HCl) is 80~130mg / m 3 , the lead concentration is 3~4.8mg / m 3 , the concentration of cadmium is 0.7~1.2mg / m 3 , the nickel concentration is 1.4~3.6mg / m 3 .

[0052] The absorption tower adopts the high-efficiency absorption tower prepared by the existing patented technology: the height of the tower is 15m, the diameter of the tower is 3m, and the gas residence time is more than 4s.

[0053] The composite absorbent is composed of urea, limestone, and potassium permanganate additives, and the specific mass composition is: 8% of urea, 5% of limestone, 0.2% of potassium permanganate oxidant, and the rest is w...

Embodiment 2

[0056] The flue gas volume of a spray drying tower in a ceramic factory is 45,000 m 3 / h, the measured dust concentration in the flue gas before purification is 2500-3050mg / m3, SO 2 The concentration is 1500~2200mg / m 3 , NO X The concentration is 550~700mg / m 3 .

[0057]The absorption tower adopts the high-efficiency absorption tower prepared by the existing patented technology: the height of the tower is 15m, the diameter of the tower is 3m, and the gas residence time is more than 4s.

[0058] The composite absorbent is composed of urea, sodium hydroxide, and sodium chlorite additives, and the specific mass composition is: urea 5%, sodium hydroxide 2%, sodium chlorite 0.1‰, and the rest is water. During use, control the reaction temperature of the composite absorbent at 50°C and the pH at 5-7.

[0059] process such as figure 1 As shown, in the specific production process, the flue gas enters the high-efficiency absorption tower from the high-speed swirl at the bottom of...

Embodiment 3

[0061] The flue gas volume of a spray drying tower in a ceramic factory is 45,000 m 3 / h, the measured dust concentration in the flue gas before purification is 2500-3050mg / m3, SO 2 The concentration is 1500~2200mg / m 3 , NO X The concentration is 550~700mg / m 3 .

[0062] The absorption tower adopts the high-efficiency absorption tower prepared by the existing patented technology: the height of the tower is 15m, the diameter of the tower is 3m, and the gas residence time is more than 4s.

[0063] The composite absorbent is composed of urea, sodium hydroxide and sodium hypochlorite additives, and the specific mass composition is: 2% of urea, 10% of sodium hydroxide, 1% of sodium hypochlorite, and the rest is water. During use, control the reaction temperature of the composite absorbent at 40°C and the pH at 5-6.

[0064] process such as figure 1 As shown, in the specific production process, the flue gas enters the high-efficiency absorption tower from the high-speed swirl ...

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Abstract

The invention discloses a synergistic purification composite absorbent for ceramic smoke multiple pollutants as well as a preparation method thereof and application of the absorbent in smoke pollution control in a ceramic industry. The absorbent is characterized in that on the basis of the existing wet desulfuration facility, the multiple pollutants in the ceramic smoke are simultaneously and efficiently purified and removed through changing the compositions of the existing desulfuration absorbing liquid, namely, using a composite absorbent containing urea, alkali and additive to carry out absorption, dissolution, complexing, oxidation, reduction, precipitation and the like in the same equipment; when the composite absorbent is saturated due to absorption and then the saturated composite absorbent is discharged into a tail liquid treatment system for harmless safety treatment; and the composite absorbent comprises the following components by weight percent: 2%-15% of urea, 1%-10% of alkali, 0.01%-2% of additive and the balance of water. According to the invention, process is simple, the system is easy to control and manage, occupied area is small, investment and operation costs are low, pollutant removal efficiency is high, and the preparation method can be implemented just by simple improvement for a ceramic enterprise with the wet desulfuration facility and is extremely suitable for national conditions in China.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a ceramic flue gas multi-pollutant synergistic purification composite absorbent, a preparation method thereof and an application in flue gas pollution control in the ceramic industry. Background technique [0002] my country is the largest producer of ceramics in the world, and its ceramic output accounts for more than 60% of the world's total output. While the ceramic industry has made significant contributions to my country's economic construction, it has also brought serious air pollution problems. The air pollutants emitted by the general ceramic industry mainly come from the flue gas of the spray drying tower for powder preparation and drying (the pollutants are mainly dust, SO 2 , NO X ) and finished kiln flue gas from firing and roasting (mainly pollutants are SO 2 , NO X , fluoride, chloride and heavy metals), according to incomplete statisti...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/96B01D53/60B01D53/64B01D53/68
Inventor 岑超平方平唐志雄陈定盛陈志航
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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