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Method for inhibiting expansion of fluidized bed combustion coal ash/slag products

A technology for sulfur-fixing ash and products, which is applied to chemical instruments and methods, manufacturing tools, clay preparation devices, etc., and can solve the problems of poor adaptability between accelerators and sulfur-fixing ash, complex changes in the composition of sulfur-fixing ash, and cement To solve the problem of high clinker content, achieve the effect of improving volume stability, good suppression effect and simple production process

Inactive Publication Date: 2011-04-27
四川白马循环流化床示范电站有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: ①This method only involves the fluidized bed sulfur-fixing slag and is not suitable for the sulfur-fixing ash with a larger output
②The maximum amount of sulfur-fixing slag is only 70%, and the amount of cement clinker is relatively high, so the cost is high
③The composition of sulfur-fixed ash is complex, and there may be a problem of poor adaptability between the accelerator and the sulfur-fixed ash

Method used

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  • Method for inhibiting expansion of fluidized bed combustion coal ash/slag products
  • Method for inhibiting expansion of fluidized bed combustion coal ash/slag products
  • Method for inhibiting expansion of fluidized bed combustion coal ash/slag products

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The specific steps of a method for suppressing the expansion of sulfur-fixed ash products are as follows:

[0026] (1) Preparation of raw materials

[0027] The sulfur-fixing slag discharged from the fluidized bed boiler coal-fired power plant and the cement clinker produced by the cement plant are respectively ground by grinding equipment (ie, a ball mill) to a fineness of 180 mesh (screen residue <10%) and then used for later use. The cement produced by the cement plant and the undisturbed sulfur-fixed ash discharged from the fluidized bed boiler coal-fired power plant are directly used.

[0028] (2) Molding of sulfur-fixed ash products

[0029] After (1) step is finished, take sulfur-fixing ash powder and cement clinker powder and cement as the raw material of cementing material, press sulfur-fixing ash powder: cement clinker powder: the ratio of the mass percent of cement is 75%: In the ratio of 25%:0%, sand is first added to the cementing material, and then mixin...

Embodiment 2

[0033] The specific steps of a method for suppressing the expansion of sulfur-fixed ash products are as follows:

[0034] (1) Preparation of raw materials

[0035] With embodiment 1.

[0036] (2) Molding of sulfur-fixed ash products

[0037] With embodiment 1, feature is: sulfur-fixing ash powder: cement clinker powder: the mass percent of cement is 100%: 0%: 0%, cementing material: the mass ratio of sand is 1: 2.0, adopts pouring molding, cementation The mass ratio of materials: mixing water is 1:0.7.

[0038] (3) autoclave curing

[0039] With embodiment 1, feature is: pressure rises to 1.7 MPa, boosting time is 4 hours, constant pressure steaming time is 2 hours, and decompression time is 4 hours.

Embodiment 3

[0041] The specific steps of a method for suppressing the expansion of sulfur-fixed ash products are as follows:

[0042] (1) Preparation of raw materials

[0043] With embodiment 1, the feature is: the grinding equipment is a vibration mill.

[0044] (2) Molding of sulfur-fixed ash products

[0045]With embodiment 1, the feature is: sulfur-fixing ash powder: cement clinker powder: the mass percent of cement is 75%: 0%: 25%, cementing material: the mass ratio of sand is 1: 3.0, adopts pouring molding, cementation The mass ratio of materials: mixing water is 1:0.4.

[0046] (3) autoclave curing

[0047] With embodiment 1, feature is: the pressure rises to 1.5 MPa, and the pressurization time is 3 hours, and the constant pressure steaming time is 6 hours, and the depressurization time is 3 hours.

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Abstract

The invention discloses a method for inhibiting expansion of fluidized bed combustion coal ash / slag products, and relates to a method for preparing building materials by autoclaved cure. The method has the following steps: taking fluidized bed combustion coal ash / slag, clinker and cement as raw materials of a cementing material, grinding the granular and lumpish raw materials, adding sand aggregate and mixing water for stirring and forming, and then performing the autoclaved cure to prepare finished products. The method is simple, can adopt a conventional still kettle for production, has simple and convenient operation, low cost, the utilization rate of the fluidized bed combustion coal ash / slag reaching between 75 and 100 percent, and good effect of inhibiting the expansion of the fluidized bed combustion coal ash / slag products, contributes to environmental protection, obviously improves early strength of the fluidized bed combustion coal ash / slag products, contributes to promotion and application and the like. The method can be widely applied to preparation of fluidized bed combustion coal ash / slag building material products with stable volumes.

Description

technical field [0001] The invention belongs to the technical field of building materials prepared by autoclaving, and in particular relates to a method for suppressing the expansion of sulfur-fixed ash products by autoclaving. Background technique [0002] China is a country rich in coal resources. Due to resource endowment conditions, coal has always occupied an absolute dominant position in my country's energy consumption stock. After burning raw coal, not only a large amount of ash will be produced, but more importantly, a large amount of SO will be produced. 2 and NO X and other acid gases. Studies have shown that by SO 2 and NO X The acid rain caused accounts for more than 90% of the total amount of acid rain, while the SO 2 and NO X Pollution is the root cause of acid rain, and the environmental problems caused by it have seriously affected the economic development of our country. In this situation, it is very necessary to adopt advanced coal-fired sulfur fixat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B3/00B28B1/14B28C7/04B28C5/00B28B11/24B02C17/00
Inventor 胡昌华钱觉时李影平王智李星华韦迎春雷秀坚张志伟陆刚韩永军
Owner 四川白马循环流化床示范电站有限责任公司
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