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Method for treating acidic gas

A technology of acid gas and treatment method, which is applied in separation methods, chemical instruments and methods, and various fluid ratio control, etc., can solve problems such as lag in addition of alkaline reagents and poor treatment of acid gas.

Active Publication Date: 2014-03-19
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This delay in measurement causes a delay in the addition of alkaline reagents, resulting in poor handling of acid gases, and becomes a cause of excessive addition of alkaline reagents

Method used

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  • Method for treating acidic gas
  • Method for treating acidic gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0109] Describe the simulated reaction system.

[0110] [Simulated reaction system]: Compound reaction between exhaust gas and bag filter

[0111] The simulated reaction system consists of the following two reactions: the reaction of micropowdered sodium bicarbonate and hydrogen chloride (HCL) occurs instantaneously in the exhaust gas, and the unreacted micropowdered sodium bicarbonate and HCL accumulated on the bag filter (refer to figure 2 )Reaction. In addition, the residence time of the collected matter in the bag filter is usually about 2 hours. Therefore, in this simulation, the finely powdered sodium bicarbonate on the bag filter disappeared after a predetermined time (set at about 2 hours).

[0112] refer to figure 2 The basic structure of the simulated reaction system is explained.

[0113] First, in the chemical dosing control in the incineration facility, based on the HCl concentration (after treatment) signal of the ion electrode-type HCl concentration measur...

Embodiment 1

[0204] The 30-minute moving average addition amount (kg / h) is multiplied by a coefficient of 80% as the base addition amount, which is used as the lower limit of the addition amount output, and other than that, it is calculated under the same setting conditions as shown in Comparative Example 1 , for feedback control.

[0205] The amount of micropowder sodium bicarbonate added and the bag filter outlet HCl concentration after the micropowder sodium bicarbonate process are shown in Figure 8 . In addition, the behavior of the addition amount of finely powdered sodium bicarbonate and the concentration of HCl at the outlet of the bag filter during this control is shown in Figure 11 .

[0206] According to Example 1, the 1-hour average HCl maximum value is 189ppm, and the instantaneous maximum value is 309ppm. Compared with Comparative Example 1, the acid gas treatment performance is improved, and the addition amount is also reduced from 330kg / h to 315kg / h.

[0207] Here, the ...

Embodiment 2

[0215] The 30-minute moving average addition amount (kg / h) was multiplied by a coefficient of 80% as the base addition amount, which was used as the lower limit of the addition amount output. In addition, in the same setting as the stepwise method shown in Comparative Example 2 Operation under certain conditions and feedback control.

[0216] The amount of micropowder sodium bicarbonate added and the bag filter outlet HCl concentration after the micropowder sodium bicarbonate process are shown in Figure 8 . In addition, the behavior of the amount of finely powdered sodium bicarbonate added and the concentration of HCl at the outlet of the bag filter during this control is shown in Figure 14 .

[0217] According to Example 2, even in the staged manner, the maximum value of the 1-hour average of the outlet HCl concentration is 195ppm, and the instantaneous maximum is 320ppm. Compared with Comparative Example 2, the acid gas treatment performance is improved, and the addition...

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Abstract

The purpose of the present invention is to provide a method for treating an acidic gas according to a novel control scheme for performing a stable acidic gas treatment that rarely causes the acidic gas concentration at the outlet to peak and for reducing the excessive addition of alkali agents in a feedback format that does not require the introduction of a new, expensive acidic-gas measurement device. This method for treating an acidic gas involves adding an alkali agent to a combustion exhaust gas containing an acidic gas and feedback-controlling the amount of the alkali agent to be added on the basis of a measurement signal from an acidic gas concentration measurement device which measures the acidic gas concentration after dust collection, the method involving at least: a step of calculating a basal addition amount found by multiplying the average addition amount suitable for the average time (for example, 1 hour, as described later) by a factor of 1 or less (for example, 80%, as described later); and a step of calculating, through feedback computation, an output value for the amount of the alkali agent to be added on the basis of the calculated basal addition amount.

Description

technical field [0001] The invention relates to a treatment method for harmful acid gases such as hydrogen chloride and sulfur oxides generated in combustion facilities such as urban garbage waste incinerators, industrial waste incinerators, power generation boilers, carbonization furnaces, and private factories. In detail, it is related with the method of efficiently controlling the addition amount of the alkaline agent which treats an acidic gas. Background technique [0002] For waste gas containing harmful hydrogen chloride and sulfur oxides, it is treated with alkaline reagents such as slaked lime and sodium bicarbonate, and then it is discharged from the chimney after dust removal by bag filter (BF) and other dust collectors. On the other hand, the fly ash collected by the dust collector contains harmful heavy metals such as Pb and Cd, and these harmful heavy metals are stabilized before landfill disposal. [0003] As an alkaline reagent for acid gas treatment, sodium...

Claims

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Application Information

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IPC IPC(8): B01D53/68B01D53/50B01D53/81G05D21/00
CPCB01D53/685B01D53/508B01D53/346
Inventor 益子光博
Owner KURITA WATER INDUSTRIES LTD
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