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Out tower oxidizing lime/acetylene sludge-gypsum process desulphurization technology and equipment

A technology of desulfurization process and desulfurization device, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc., can solve problems such as poor economy, reduce investment and operating costs, ensure desulfurization efficiency, and achieve high quality effects

Active Publication Date: 2008-07-30
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of preparing desulfurized gypsum by oxidation outside the tower adopts a higher pH value in the tower to absorb sulfur dioxide, and the absorbed lime slurry enters the oxidation tank, and then adds dilute sulfuric acid to reduce the pH value in the oxidation tank to achieve the optimum oxidation pH value. The price is high, so the method is not economical

Method used

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  • Out tower oxidizing lime/acetylene sludge-gypsum process desulphurization technology and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] As shown in Figure 1, the process flow of the present invention is that the flue gas from the boiler enters the main fan 29 after dedusting, and the flue gas (initial flue gas) at the outlet of the main fan 29 is divided into two paths, most of which enter the desulfurization tower 1, the Part of the flue gas reacts with the lime / carbide slag slurry in the desulfurization tower 1, and is discharged from the chimney 30 on the upper part of the desulfurization tower 1 after purification. Packed tower, Venturi, spray tower, etc., the lime / carbide slag slurry in the desulfurization tower 1 is circulated through the circulation pump 2.

[0042] The absorbent lime or calcium carbide slag is stored in the lime storage bin 3, and enters the alimerator 6 through the screw conveyor 4 and the weighing tank 5, and then the ash pump 7 is introduced into the lime slurry tank 8, and the lime / calcium carbide in the lime slurry tank 8 The slag slurry is transported to the desulfurizatio...

Embodiment 2

[0051] Flue gas is treated according to the process flow of Example 1. A 130t / h pulverized coal furnace in a thermal power plant uses calcium carbide slag for desulfurization, and the flue gas volume is 240,000m 3 / h, the concentration of sulfur dioxide at the inlet of the desulfurization tower is 4000mg / Nm 3 , design liquid-gas ratio 5L / m 3 , the pH value in the desulfurization tower is 8.0, the pH value in the oxidation tank is 5.0, the amount of flue gas passing into the oxidation tank accounts for 20% of the total flue gas volume, the desulfurization efficiency is 96.2%, the moisture content of desulfurization gypsum is less than 9%, and the purity is 91%. The particle size is 60-90 microns, and the residual calcium hydroxide content is 0.009%.

Embodiment 3

[0053] Flue gas is treated according to the process flow of Example 1. The 170t / h pulverized coal furnace of a thermal power plant adopts lime desulfurization, and the flue gas volume is 280000m 3 / h, the concentration of sulfur dioxide at the inlet of the desulfurization tower is 2100mg / Nm 3 , design liquid-gas ratio 3L / m 3 , the pH value in the desulfurization tower is 6.0, the pH value in the oxidation tank is 4.0, the amount of flue gas passing into the oxidation tank accounts for 10% of the total flue gas volume, the desulfurization efficiency is 92.6%, the moisture content of desulfurization gypsum is less than 8%, and the purity is 92%. The particle size is 70-100 microns, and the residual amount of calcium hydroxide is 0.005%.

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Abstract

The invention discloses a lime oxidation outside tower / carbide-gypsum desulfurization technology and a device thereof, wherein, the technology comprises the steps that initial gas is introduced into a desulfurizing tower and reacted with lime / carbide slurry; sulfur dioxide in the gas is absorbed by the lime / carbide slurry and emitted. The lime / carbide slurry becomes desulfurization slurry after absorbing sulfur dioxide in the desulfurizing tower; the desulfurization slurry is discharged from the desulfurizing tower and introduced into an oxidation tank; one part of the initial gas is introduced into the desulfurizing tower and reacted with the lime / carbide slurry, while the other part is introduced into the oxidation tank to adjust the pH value of the desulfurizing slurry discharged from the desulfurizing tower to 3.0-5.5; then oxygen is introduced into the oxidation tank to carry out oxidation reaction with the desulfurizing slurry, so as to obtain desulfurization gypsum and be recovered. Compared with the prior art, the invention can not only reduce investment and operation cost, but also produce higher-quality desulfurization gypsum as by-product.

Description

technical field [0001] The invention relates to a flue gas desulfurization process, in particular to a flue gas desulfurization process and device for external oxidation. Background technique [0002] Limestone / lime-gypsum flue gas desulfurization technology began to appear in the 1960s and 1970s, and has become the most mature technology in the field of flue gas desulfurization. Since the oxidation of calcium sulfite needs to be oxidized quickly at a lower pH value, the early limestone-gypsum method used the method of external oxidation and acid to adjust the pH value of the lime slurry to prepare desulfurized gypsum, and then gradually developed a relatively low pH value in the tower. The desulfurization process of low pH value absorption and oxidation improves the reliability of the desulfurization system, and at the same time produces desulfurization gypsum by-product. However, due to the low pH value of the absorption liquid, the liquid-gas ratio used is large. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/80
Inventor 吴忠标莫建松程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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