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Method for preparing highway subgrade material from desulfurization ash of circulating fluidized bed boiler

A circulating fluidized bed and roadbed material technology, which is applied in the resource utilization of electricity and solid waste, and in the field of roads, to achieve the effects of strong durability, avoiding reaction expansion, and ensuring road quality

Active Publication Date: 2021-08-27
华东理工常熟研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to prepare circulating fluidized bed (CFB) boiler desulfurization ash into highway subgrade materials in view of the characteristics of high calcium, high sulfur, and high partial kaolin in the desulfurization ash of circulating fluidized bed (CFB) boilers, so as to solve the problem of circulation Issues in large-scale application of fluidized bed (CFB) boiler desulfurization ash

Method used

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  • Method for preparing highway subgrade material from desulfurization ash of circulating fluidized bed boiler

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Effect test

Embodiment 1

[0026] The slag obtained from a CFB boiler contains 3.68%SO 3 , 1.2%Ca(OH) 2 , 12.03%CaO (excluding CaSO 4 CaO in), and 42.5PO cement (containing 2.5% SO 3 ) to prepare roadbed materials, including 10% cement, 90% slag, and the total SO in the mixture 3 It is (0.9* 0.0368 * 2.5+0.1 * 0.025) * 100=8.53%, the total CaO is (0.9 * 0.012 * 0.77+0.9 *0.1203) * 100=11.66%, according to the water-solid ratio of 0.27, add water and stir the mixture, the mixture The strength of the material is 21MPa after 28 days of curing, and the sample volume does not expand before and after curing.

Embodiment 2

[0028] The slag obtained from a CFB boiler contains 6.02% SO 3 , 1.02%SO 2 , 10.18%CaO (excluding CaSO 4 CaO in the mixture), mixed with clay to prepare roadbed materials, including 70% slag, 30% clay, and the total SO in the mixture 3 It is (0.7 * 0.0602 * 2.5+0.7*0.0102*1.25) * 100=11.43%, the total CaO is 0.7 * 0.1101* 100=11.66%, according to the water-solid ratio of 0.35, add water and stir with the mixture, and the strength of the mixture is 15MPa after curing for 28 days , the sample volume did not expand before and after curing.

Embodiment 3

[0030] A CFB boiler adopts in-furnace desulfurization, and the tail gas adopts semi-dry desulfurization process, and the obtained ash contains 2.79% SO 3 , 0.82%SO 2 , 9.23%CaO (excluding CaSO 4 CaO in), and 42.5PO cement (containing 2.5% SO 3 ) to prepare subgrade materials by mixing, including 96% ash, 4% 42.5PO cement, and the total SO in the mixture 3 (0.96 * 0.0279 * 1.6+0.96*0.0082*1.25+0.04* 0.025) * 100=5.38%, the total CaO is 0.96 * 0.0923* 100=6.94%, according to the water-solid ratio of 0.40, add water and stir with the mixture, and the mixture is cured The 28-day strength is 8MPa, and the sample volume does not expand before and after curing.

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Abstract

The invention belongs to the field of resource utilization of highways, electric power and solid waste, and more specifically relates to a method for preparing highway subgrade materials from desulfurization ash of a circulating fluidized bed boiler. The present invention takes CFB boiler desulfurization ash as the main raw material, and uses SO 3 , SO 2 , CaO and water-solid ratio are used as the basis for judgment. By mixing with clay or cement, the immersion curing strength can exceed 1MPa, and the semi-dry mixture or slurry will not crack when solidified, meeting the requirements of general roadbeds of various grades of roads, and realizing CFB boiler desulfurization Large-scale utilization of ash and slag saves road construction costs.

Description

technical field [0001] The invention belongs to the field of resource utilization of highways, electric power and solid waste, and more specifically relates to a highway subgrade material prepared from desulfurization ash of a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed (CFB) boilers have the advantages of strong adaptability to coal types, high combustion efficiency, and high-temperature desulfurization in the furnace. In recent years, they have rapidly become the first choice for new thermal power plants encouraged by the state. Therefore, my country has become the country with the largest number of circulating fluidized bed boilers and the largest total installed capacity in the world. Due to the use of low calorific value coal combustion for energy, the ash discharged by CFB boilers accounts for about 50% of the raw coal mass, which is 2-4 times that of pulverized coal boilers with the same power generation scale. As of 2016...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B28/04
CPCC04B28/001C04B28/04C04B2111/0075C04B2201/50C04B18/061
Inventor 乔秀臣
Owner 华东理工常熟研究院有限公司
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