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Preparation method of pulverized fuel ash desulfurizing agent

A technology for fly ash and desulfurization agent, which is applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problem of low desulfurization efficiency of flue gas desulfurization process, achieve low production cost, increase specific surface area, increase The effect of high contact probability

Active Publication Date: 2013-07-03
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to Ca(OH) 2 The specific surface area is small, the desulfurization reaction is mainly concentrated on the surface, and the generated product CaSO 4 It is easy to cover the surface of the reactant, thereby inhibiting the further progress of the desulfurization reaction, which is also the reason why the desulfurization efficiency of the current flue gas desulfurization process is not high

Method used

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  • Preparation method of pulverized fuel ash desulfurizing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Weigh fly ash with a mass ratio of 1:10 and mix with distilled water to form a reaction solution, then add saturated Ca(OH) 2 The solution adjusts the pH value of the reaction solution to 10, wherein the fly ash is a circulating fluidized bed high-calcium fly ash.

[0027] Step 2: Place the reaction solution obtained in step 1 in a heat-collecting constant temperature magnetic stirrer for stirring and heating. When the temperature of the reaction solution reached 40°C, the timer was started, and the reaction was continued for 1 h.

[0028] Step 3: Add a composite activator to the reaction solution obtained in step 2 until the pH value of the reaction solution is adjusted to 14 and then continue to react for 5 hours, wherein the composite activator is Na 2 SiO 3 9H 2 Aqueous solution of O.

[0029] Step 4: Take out the reaction solution obtained after the treatment in step 3, perform cooling and filtration, and then place the filtered product under the condit...

Embodiment 2

[0031] Step 1: Weigh fly ash with a mass ratio of 1:25 and mix with distilled water to form a reaction solution, then add saturated Ca(OH) 2 The solution adjusted the pH of the reaction solution to 12.

[0032] Step 2: Place the reaction solution obtained in step 1 in a heat-collecting constant temperature magnetic stirrer for stirring and heating. When the temperature of the reaction solution reached 80°C, the timer was started, and the reaction was continued for 3 hours.

[0033] Step 3: Add a composite activator to the reaction solution obtained in step 2 until the pH value of the reaction solution is adjusted to 12 and then continue to react for 10 hours, wherein the composite activator component is Na 2 SiO 3 9H 2 Aqueous solution of O and NaOH mixture, and Na 2 SiO3 9H 2 The mass ratio of O and NaOH is 5:1.

[0034] Step 4: Take out the reaction solution obtained after the treatment in step 3 and perform cooling filtration, and then place the filtered product at 12...

Embodiment 3

[0036] Step 1: Weigh fly ash with a mass ratio of 1:17 and mix with distilled water to form a reaction solution, then add saturated Ca(OH) 2 The solution adjusted the pH of the reaction solution to 11.

[0037] Step 2: Place the reaction solution obtained in step 1 in a heat-collecting constant temperature magnetic stirrer for stirring and heating. When the temperature of the reaction solution reached 60°C, the timer was started, and the reaction was continued for 2 hours.

[0038] Step 3: Add a composite activator to the reaction solution obtained in step 2 until the pH value of the reaction solution is adjusted to 13 and then continue to react for 7.5 hours, wherein the component of the composite activator is Na 2 SiO 3 9H 2 Aqueous solution of O.

[0039] Step 4: Take out the reaction solution obtained after the treatment in step 3 and perform cooling filtration, and then place the filtered product at 115° C. and dry it at a constant temperature until it reaches a const...

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Abstract

The invention provides a preparation method of a pulverized fuel ash desulfurizing agent. The preparation method comprises the following steps of; regulating the pH value of reaction liquid, prepared by mixing pulverized fuel ash and distilled water in the mass ratio of (1:10)-(1:25), to 10-12 by using a saturated Ca(OH)2 solution; then stirring and heating the reaction liquid, adding a compositeexciting agent after the reaction liquid constantly reacts for 1 to 3 hours; regulating the pH value of the reaction liquid to 12-14, and continuously reacting for 5 to 10 hours; and finally, taking out the reaction liquid, and cooling, filtering and drying the reaction liquid until the reaction liquid is in constant weight to obtain the product, namely the pulverized fuel ash desulfurizing agent. The pulverized fuel ash prepared by using the method has a space net structure with more pores on the surface, so that the specific surface area of the desulfurizing agent is increased, the contact probability of smoke and the desulfurizing agent is increased, and the smoke desulfurizing effect and efficiency are greatly improved.

Description

【Technical field】 [0001] The invention relates to a preparation method of a flue gas desulfurizer, in particular to a preparation method of a coal ash desulfurizer. 【Background technique】 [0002] my country is a country that uses coal as its main energy source, and the SO produced by coal burning 2 It is the main gaseous pollutant in my country's air pollution, and my country's SO 2 Pollution control in China mainly focuses on flue gas desulfurization using Ca compounds as desulfurizers. In various flue gas desulfurization processes, the utilization rate of desulfurization agent is an important indicator that affects the operability of the desulfurization system. SO 2 The reaction process with desulfurizer is mainly gas-solid interface reaction and gas-liquid-solid interface reaction. One of the influencing factors of desulfurization reaction is the diffusion of gas phase on the surface of solid phase or liquid phase and the surface contact probability of gas phase and s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/81B01D53/50
Inventor 刘心中彭蕾翁仁贵
Owner FUJIAN UNIV OF TECH