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Carbide slag-based flue gas desulfurization method

A calcium carbide slag and flue gas technology, which is applied in the field of flue gas desulfurization, can solve the problems of large solid particles, low adsorption capacity, and increased usage of desulfurizers, and achieve the effects of reduced desulfurization costs, high-efficiency desulfurization, and reduced usage

Inactive Publication Date: 2018-01-23
中晶蓝实业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The processing of calcium carbide slag raw materials only includes the screening of solid substances in the raw materials, and does not involve the removal of reducing substances in the desulfurization process, resulting in complex by-products that cannot be effectively used
Moreover, the desulfurization agent reacts slowly with the flue gas, and the solid particles are large, which will affect the desulfurization effect.
[0005] In addition, in CN101898083A and CN104437023A, in the method and equipment for producing desulfurizing agent from calcium carbide slag, the working condition of the desulfurizing agent requires high temperature, and it can only be used at the air inlet. At the same time, the desulfurizer with the same weight has a small diffusion area and low adsorption capacity, which will also increase the amount of desulfurizer; in addition, in order to meet the requirements of environmental protection and achieve the desulfurization effect, it is necessary to increase the amount of desulfurizer used, resulting in cost the rise of

Method used

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  • Carbide slag-based flue gas desulfurization method
  • Carbide slag-based flue gas desulfurization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Modulation of desulfurizing agent composition of the present invention:

[0057] Mix the components evenly according to the following formula to obtain the desulfurizer composition.

[0058] Table 1. Formula of desulfurizer composition

[0059]

[0060] (2) Flue gas desulfurization process:

[0061] 1. Pulping:

[0062] The prepared desulfurizing agent composition is added with water to make pulp, matured to form desulfurizing agent slurry, and kept in the slurry tank for later use.

[0063] 2. Flue gas desulfurization:

[0064] The sulfur dioxide in the flue gas reacts with the desulfurizer slurry in the desulfurization tower to remove the sulfur dioxide in the flue gas. The parameters of the flue gas entering the desulfurization tower are shown in Table 2.

[0065] Table 2. Inlet parameters of flue gas desulfurization

[0066] serial number

parameter

unit

value

1

Inlet flue gas volume (working condition)

m 3 / h

108...

Embodiment 2～4

[0078] The flue gas desulfurization and magnesium sulfate production were carried out under the same conditions as in Example 1 except that the formulations in each desulfurizer composition were adjusted according to Table 3. The desulfurization effect is shown in Table 4.

[0079] Table 3. Formulas of each desulfurizer composition

[0080] Element

Embodiment 5

[0082] Other conditions were the same as in Example 1 except that the desulfurization slurry was discharged when the pH value reached 5.8. The desulfurization effect is shown in Table 4.

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Abstract

The invention discloses a carbide slag-based flue gas desulfurization method, comprising the following steps: adding water into a desulfurizer composition, and preparing desulfurizer slurry, wherein the desulfurizer composition is prepared from 40 to 80 parts by weight of carbide slag and 20 to 60 parts by weight of magnesium oxide; enabling the desulfurizer slurry to make contact with flue gas ata temperature of 140 DEG C or lower and with oxygen content of 10 to 20vol%, and when the temperature of the flue gas is lower than 75 DEG C after desulfurization, discharging the flue gas; when thepH of a sizing agent formed after desulfurization is 5.3 to 6.8, discharging the sizing agent. The desulfurization method has the advantages that on one hand, the desulfurizer composition obtained bythe carbide slag as waste is adopted, rubbish such as the solid waste is recycled, the use amount of the magnesium oxide is reduced, and the desulfurization cost is lowered; on the other hand, after an existing method is improved, efficient desulfurization can be realized by using the desulfurizer composition.

Description

technical field [0001] The invention relates to a flue gas desulfurization method, in particular to a flue gas desulfurization method based on a calcium carbide slag desulfurizer. Background technique [0002] Carbide slag, as waste, has been used to replace limestone to make cement, produce chemical products, and produce building materials. With the continuous improvement of environmental protection requirements and the continuous application of research results, the use of carbide slag as the main component of desulfurization agent in flue gas treatment has become a new way of utilization of carbide slag waste. [0003] CN101168117A discloses a method for preparing a high-efficiency solid desulfurizer by utilizing calcium carbide slurry, which involves centrifuging the calcium carbide slurry, filtering and pressing, and then adding a desiccant and a high-efficiency anti-coagulation grinding aid to prepare the desulfurizer; at the same time In order to obtain a solid parti...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50C01F5/40
Inventor 童裳慧
Owner 中晶蓝实业集团有限公司
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