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Acid gas treatment agent and acid gas treatment method

An acid gas and treatment agent technology, applied in separation methods, chemical instruments and methods, alkali metal carbonates to prevent moisture absorption, etc. Increased pressure loss, high processing efficiency, and easy peeling effects

Active Publication Date: 2019-05-14
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Dry silica with a small average particle size, such as fumed silica, is generally expensive, which increases the cost of anti-coagulation agents.
Wet silica or hydrophilic synthetic silica is cheap and has high anti-consolidation effect but poor fluidity due to hydrophilicity
Therefore, the peelability of the filter cloth surface of the bag filter is not good, which reduces the air permeability of the filter cloth and increases the pressure loss.
If the blending ratio of activated carbon is not enough, it will be difficult to obtain sufficient anti-consolidation effect
[0015] The method of using wet silica as an anti-solidification agent of sodium bicarbonate and adding it at an appropriate ratio, and mixing metal soap as a release agent for sodium bicarbonate formed on the filter cloth surface of the bag filter, spends on anti-coagulation The cost of the two agents is higher

Method used

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  • Acid gas treatment agent and acid gas treatment method
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  • Acid gas treatment agent and acid gas treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0069] [Examples 1 to 5, Comparative Examples 1 and 2, Reference Examples 1 to 4]

[0070] The acid gas treating agent was prepared by blending the chemicals shown in Table 1. For each acid gas treatment agent, the following load test and bag filter test were performed. The results are shown in Table 1.

[0071]

[0072] use figure 1 With the load test apparatus shown, fixability was evaluated by the following method.

[0073] 100 g of acid gas treating agent 2 was filled in frame-shaped box 1 of 100 mm×100 mm, and load 3 of 10 kg was applied for 3 hours. Afterwards, the acid gas treatment agent was placed on a stainless steel sieve with a mesh size of 355 μm, the fine powder was partially dropped, and the mass of the coarse particles remaining on the sieve was measured, and the ratio (mass %) relative to the mass for the test was calculated. ). The smaller the ratio on the sieve, the more the caking can be prevented, and the more the fine powder part falls.

[0074] D...

Embodiment 2

[0094] In Example 2, by making the blending ratio of the anti-caking agent lower than in Example 1, the anti-caking effect and pressure loss equivalent to those in the comparative example were obtained. The advantage is that the blending ratio of the anti-caking agent is lower than that of the comparative example, and the blending ratio of the pulverized sodium bicarbonate component of the acid gas treatment component is increased.

[0095] In Example 3 and Example 4, it was confirmed in the load test that the anti-coagulation effect was superior to that of the comparative example, and the pressure loss of the bag filter was equivalent to that of the comparative example. The advantage is that the blending ratio of the anti-caking agent is smaller than that of the comparative example, and the blending ratio of the pulverized sodium bicarbonate, which is an acid gas treatment component, is increased.

Embodiment 5

[0096] Example 5 is a result of using two kinds of anti-caking agents, and exhibited the same anti-caking effect and pressure loss as those of the comparative example. The advantage is that the blending ratio of the anti-caking agent is smaller than that of the comparative example, and the blending ratio of the pulverized sodium bicarbonate, which is an acid gas treatment component, is increased.

[0097] For reference examples 1 and 3, the blending amount of carbon black or hydrophobic silica is small, and the anti-consolidation effect is poor, but the pressure loss is small.

[0098] For reference examples 2 and 4, the blending amount of carbon black or hydrophobic silica is large, and the anti-caking effect is extremely high, but the pressure loss is large.

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Abstract

The present invention provides an acid gas treating agent using sodium bicarbonate as a neutralizing agent for acid gas, which is difficult to solidify and has excellent peelability. The acid gas treating agent contains sodium bicarbonate and an anti-caking agent of sodium bicarbonate, and the anti-caking agent is carbon black and / or hydrophobic silicon dioxide. The content of the anti-coagulation agent is preferably 0.1 to 2.0% by mass. The average particle diameter of hydrophobic silica is preferably 1 to 20 μm, and the average particle diameter of carbon black is preferably 0.1 to 10 μm.

Description

technical field [0001] The present invention relates to an acid gas treatment agent and an acid gas treatment method for neutralizing acid gases such as hydrogen chloride and sulfur oxides in combustion exhaust gas discharged from waste treatment equipment or power generation boilers. Background technique [0002] Calcium-based waste gas treatment agents such as calcium hydroxide or sodium-based waste gas such as sodium bicarbonate have been used as treatment agents for acid gases such as hydrogen chloride and sulfur oxides in combustion exhaust gas discharged from waste treatment equipment or power generation boilers. treatment agent. [0003] When calcium hydroxide is used as an exhaust gas treating agent, it is necessary to excessively use an equivalent amount equivalent to 3 to 4 times that of acid gas, and thus the amount of dust generated is large. On the other hand, sodium bicarbonate is used in a smaller amount than calcium hydroxide, but the particles of granular s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/40B01D53/50B01D53/68C01D7/42
CPCB01D53/40B01D53/50B01D53/68C01D7/42
Inventor 村田裕之
Owner KURITA WATER INDUSTRIES LTD
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