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Method for preparing sulfuric acid by roasting power plant desulfurized cinder with fluidized bed roaster

A technology of desulfurization waste residue and fluidized roasting furnace, which is applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve water pollution, environmental pollution and other problems, and achieve the effect of reducing costs, reducing equipment investment, and reducing pollution points

Inactive Publication Date: 2010-07-14
李德安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the desulfurization waste is simply treated, and it will still cause a certain degree of environmental pollution after treatment.
At present, the recovery of calcium sulfate is mainly used for ditch filling and land reclamation. Although this treatment reduces air pollution, it will cause water pollution after being washed by rainwater. Therefore, if it is not used, or a better treatment method is adopted, Desulfurized calcium sulfate will become a secondary pollution source

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: A method for producing sulfuric acid by roasting desulfurization waste residue in a power plant with a fluidized bed furnace

[0025] Preparation method: Weigh 8.3 tons of the mixture of calcium sulfite and calcium sulfate, 1.9 tons of sulfur, and 2.9 tons of coke foam in the desulfurization waste residue of the raw material power plant, and then mix them. Imported into the silo, according to the amount of mixture required to produce 6 tons of sulfuric acid per hour, the mixture is continuously introduced into the fluidized roasting furnace, the roasting temperature is 1150 ° C, and the roasting time is 5 to 10 minutes; after roasting and decomposition, sulfur dioxide gas is obtained. Then the obtained sulfur dioxide is introduced into the waste heat boiler for cooling, and after cooling, 9.9 tons of sulfuric acid products are prepared by using the existing production technology of sulfuric acid, and the concentration of sulfuric acid is 93-98%; It is disc...

Embodiment 2

[0026] Embodiment two: the same place as embodiment one is no longer described, and the difference is:

[0027] Weigh 8.5 tons of calcium sulfite and calcium sulfate mixture, 1.7 tons of sulfur, and 2.8 tons of coke foam in the desulfurization waste residue of the power plant. The roasting temperature is 1200 ° C, and the obtained sulfuric acid product is 9.8 tons.

Embodiment 3

[0028] Embodiment three: the same place as embodiment one is no longer described, and the difference is:

[0029] Weigh 17.6 tons of the mixture of calcium sulfite and calcium sulfate, 3.2 tons of sulfur, and 5 tons of coke foam in the desulfurization waste residue of the power plant. The roasting temperature is 1000 ° C, and the obtained sulfuric acid product is 19.8 tons.

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Abstract

The invention discloses a process for calcining and preparing sulphuric acid by a fluidized bed furnace for desulfurizing waste residue of power plants. The process takes desulfurized waste residue of the power plants, sulfur and discarded coke dust as raw materials and employs the fluidized bed calcining furnace to initially prepare sulfur dioxide, wherein the obtained sulfur dioxide has the concentration of 8-13%, and then the obtained sulfur dioxide is taken as the raw material to prepare the sulphuric acid by employing the prior art, wherein the obtained sulphuric acid has the concentration of 93-98%. The process not only resolves the problem of after-treatment of the wastes and enables the wastes to be recycled, but also saves pyrite resources poor at home, and the generated economical benefits are quite considerable. And a calcium oxide waste residue is also generated in the process of production, which can be taken as desulfurizer of the power plants to be recycled after cooling treatment. Therefore, the process employed by the invention to prepare the sulphuric acid not only reduces cost for producing the sulphuric acid, but also reduces cost of thermal power plants.

Description

1. Technical field: [0001] The invention relates to a method for preparing sulfuric acid, in particular to a method for preparing sulfuric acid by roasting desulfurized waste slag in a fluidized furnace. 2. Background technology: [0002] With the development of the economy, all kinds of energy have been greatly developed and utilized, and some energy sources are relatively poor. For the sustainable development of the economy, it is necessary to make full and reasonable use of various resources. The thermal power plant is an industry with fast economic growth in my country. It produces a large amount of desulfurization waste every year. The main components of the desulfurization waste are calcium carbonate, calcium hydroxide, calcium sulfite, calcium sulfate, calcium chloride and other substances. The sulfur content in calcium sulfate and calcium sulfite is about 24%, which is the best raw material to replace sulfur and pyrite to produce sulfuric acid. Most of the desulfuriz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/74
CPCY02P20/129
Inventor 李德安郭俊萍
Owner 李德安
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