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System and method for removing chlorine salt from waste incineration fly ash

A waste incineration fly ash and chlorine salt technology, which is applied to the removal of alkali metal chlorides, solid waste, calcium/strontium/barium chloride, etc., can solve the problem that the chlorine content cannot meet resource utilization, the cost of solid-liquid separation increases, Problems such as low utilization rate of water resources, to achieve the effect of reducing the possibility of heavy metal release, good environmental and economic benefits, and reducing obstacles to subsequent resource utilization

Active Publication Date: 2014-08-13
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] At present, the commonly used method for treating chlorine in waste incineration fly ash is water washing. For example, the Chinese patent document with publication number CN102513329A discloses a method for harmless disposal of municipal waste incineration fly ash. The method combines waste incineration fly ash with tap water The chlorine salt is washed out after mixing in a ratio of 1:4 to 1:10 in mass volume ratio (g / ml), but this method consumes a lot of water, the cost of solid-liquid separation increases, and the utilization rate of water resources is not high
The Chinese patent document with the publication number CN102173611A discloses a pretreatment process and device for incineration fly ash. After dehydration, the chloride ion content in the filter cake with a water content of 25% to 30% is 0.1% to 0.6% by weight, and the washing efficiency is low. , the chlorine content in the ash after washing cannot meet the requirements of subsequent resource utilization

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  • System and method for removing chlorine salt from waste incineration fly ash
  • System and method for removing chlorine salt from waste incineration fly ash

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Embodiment 1

[0044] figure 1 It shows the waste incineration fly ash chlorine salt removal system of the present invention, the waste incineration fly ash chlorine salt removal system includes a fly ash storage and transportation device 1, a first ultrasonic cleaning device 2, a second ultrasonic cleaning device 3, a third ultrasonic cleaning device Device 4, ash resource utilization device 5 (specifically, a high-pressure reactor) and a chlorine salt resource utilization device 6 (specifically, a boiler, or a solar evaporation device);

[0045] The fly ash storage and transportation device 1 is connected to the first ultrasonic cleaning device 2;

[0046] Between the first ultrasonic cleaning device 2 and the second ultrasonic cleaning device 3, there is a first conveying device 28 (specifically a belt conveyor) for transferring the filter cake produced by the first ultrasonic cleaning device 2 to the second ultrasonic cleaning device 3 ), between the second ultrasonic cleaning device 3 ...

Embodiment 2

[0068] A method for removing chlorine salts from garbage incineration fly ash of the present invention, the system for removing chlorine salts from garbage incineration fly ash is the same as that in Example 1, and the operation steps are basically the same as in Example 1, except that there are differences in parameters. The specific parameters of this embodiment as follows:

[0069] S1: The initial moisture content of the fly ash is 3.2%, and the CaO content is 13.7wt%. The washing time is 1 hour, and the ultrasonic washing temperature is 4°C to 50°C (the temperature will rise during the ultrasonic process, the same below);

[0070] S2: When the water recovered and condensed in the second ultrasonic cleaning device 3 is mixed with the filter cake delivered by the first ultrasonic cleaning device 2, the fly ash in step S1 is used as a reference to measure, and the mass ratio of the fly ash to the recovered condensed water is 1:3; the time of the second ultrasonic washing is ...

Embodiment 3

[0074] A method for removing chlorine salts from garbage incineration fly ash of the present invention, the system for removing chlorine salts from garbage incineration fly ash is the same as that in Example 1, and the operation steps are basically the same as in Example 1, except that there are differences in parameters. The specific parameters of this embodiment as follows:

[0075] S1: The initial moisture content of the fly ash is 3.2%, and the CaO content is 20wt%. The time of washing is 1h, and the temperature of ultrasonic washing is 4℃~50℃;

[0076] S2: When the water recovered and condensed in the second ultrasonic cleaning device 3 is mixed with the filter cake delivered by the first ultrasonic cleaning device 2, the fly ash in step S1 is used as a reference to measure, and the mass ratio of the fly ash to the recovered condensed water is 1:5; the time of the second ultrasonic washing is 1h, and the temperature of ultrasonic washing is 4℃~50℃;

[0077] S3: When the...

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Abstract

The invention discloses a system and a method for removing chlorine salt from waste incineration fly ash. The system comprises a fly ash storing-conveying device, a first ultrasonic washing device, a second ultrasonic washing device, a third ultrasonic washing device, an ash residue resource utilization device and a chlorine salt resource utilization device. The method comprises the steps of firstly mixing fly ash with filter liquid in the first ultrasonic washing device for first ultrasonic washing, then mixing the fly ash with water in the second ultrasonic washing device for second ultrasonic washing, mixing the fly ash with water in the third ultrasonic washing device for third ultrasonic washing, and finally carrying out resource utilization. By virtue of the system and the method, a water resource can be circularly utilized, the rate of removing chlorine salt in waste incineration fly ash is high, the residual quantity of chlorine salt is low, and the hazard-free treatment and reutilization of fly ash are realized.

Description

technical field [0001] The invention belongs to the field of harmless and resourceful utilization of waste incineration fly ash, and in particular relates to an ultrasonically enhanced waste incineration fly ash chlorine salt removal system and method. Background technique [0002] With the rapid development of China's economy and the steady improvement of people's living standards, the amount of garbage generated is increasing day by day. Since waste incineration can realize the reduction, harmless and resourceful disposal and utilization of urban domestic waste, it has become an important development trend of domestic and foreign waste disposal. my country's urban waste disposal is in a transition from landfill-based to incineration-based transition period. Especially in the past ten years, my country's urban waste incineration has developed rapidly. In 2011, the incineration capacity was 33 times that of 2000, reaching 94,000 tons per day. In August 2013, about 159 domes...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00C01D3/04C01F11/32
Inventor 袁兴中吴志斌王侯蒋谦刘阳曾光明郭术光张慧荣
Owner HUNAN UNIV
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