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How to deal with acid gas

A technology of acid gas and treatment method, which is applied in the direction of separation method, chemical instrument and method, controller with specific characteristics, etc. It can solve the problems of being unable to deal with, ignoring the measurement delay of the measuring device, poor acid gas treatment, etc., and achieving surplus Added effects for reducing, stabilizing, improving measurement latency

Active Publication Date: 2016-05-11
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] However, for Patent Document 1, it is possible to deal with the sudden generation of acid gas at the inlet to a certain extent, but it does not take into account the measurement delay of the measuring device, and cannot deal with the delay caused by the addition of alkali agent caused by the measurement delay. Poor handling of acid gases
In addition, with regard to Patent Document 2 and Patent Document 3, in combustion facilities such as incineration facilities, most facilities only measure the acid gas concentration at the outlet. In order to implement this control method, it is necessary to measure the acid gas concentration at the inlet. A new and expensive acid gas measuring device for measurement is introduced

Method used

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  • How to deal with acid gas
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  • How to deal with acid gas

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0200] Under the same setting conditions as the PID shown in Comparative Example 1, when the 6-second mean value of the slope of the latest HCl concentration is positive, the control target value (SV) is controlled to 30 ppm, and when the slope of the latest HCl concentration When the 6-second average value of is negative, control the control target value (SV) to 40ppm. Similarly, Table 1 represents the amount of fine powder sodium bicarbonate added and the bag filter outlet HCl concentration (average concentration, hourly average maximum concentration, instantaneous maximum concentration) after the fine powder sodium bicarbonate treatment. in addition, Figure 12 It represents the change of the amount of fine powder sodium bicarbonate added and the concentration of HCl at the outlet of the bag filter during this control.

[0201] It is known that when the slope of the HCl concentration is positive (increasing tendency), the control target value is set to a low control target...

example 2

[0203] Under the same setting conditions as the PID shown in Comparative Example 1, when the 6-second mean value of the slope of the latest HCl concentration is positive, the control target value (SV) is controlled to 30 ppm, and when the slope of the latest HCl concentration When the 6-second average value of is negative, control the control target value (SV) to 50ppm. Similarly, Table 1 represents the amount of fine powder sodium bicarbonate added and the bag filter outlet HCl concentration (average concentration, hourly average maximum concentration, instantaneous maximum concentration) after the fine powder sodium bicarbonate treatment. in addition, Figure 13 It represents the change of the amount of fine powder sodium bicarbonate added and the concentration of HCl at the outlet of the bag filter during this control.

[0204] When the slope of the HCl concentration is positive (increasing tendency), similar to Example 1, the effect of preventing the generation of HCl pea...

example 3

[0212] In the same step-by-step control method as Comparative Example 2, when the 6-second mean value of the slope of the latest HCl concentration is positive, the control target value (SV) is controlled to 30ppm, and when the 6-second average of the slope of the latest HCl concentration When the average value is negative, control the control target value (SV) to 40ppm. Similarly, Table 1 represents the amount of fine powder sodium bicarbonate added and the bag filter outlet HCl concentration (average concentration, hourly average maximum concentration, instantaneous maximum concentration) after the fine powder sodium bicarbonate treatment. In addition, Table 3 shows the control output addition amount of fine powder sodium bicarbonate corresponding to the HCl concentration at the outlet of the bag filter. also, Figure 15 It represents the change of the amount of fine powder sodium bicarbonate added and the concentration of HCl at the outlet of the bag filter during this cont...

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Abstract

PROBLEM TO BE SOLVED: To prevent a failure in acidic gas treatment and the excessive addition of an alkali agent, which are caused by delay in measurement by an acidic-gas measurement device, without additionally introducing an expensive acidic-gas measurement device, in feedback control. SOLUTION: This method for treating acidic gas includes the following processes: a process in which the ranges of at least two gradients in concentration of acidic gas are set; a process in which target values in controlling the concentration of the acidic gas are set for each of the ranges of at least the two gradients concerned; and a process in which a control output value, which indicates the amount of an alkali agent to be added, is computed on the basis of at least a measurement signal by an acidic-gas measurement device and the control target values concerned. In the process in which the control target values are set, the control target values, which are set in case that the ranges of the gradients in concentration of the acidic gas are large (when the acidic gas tends to increase), are smaller than the control target values which are set in case that the ranges of the gradients in concentration of the acidic gas are small (when the acidic gas tends to decrease).

Description

technical field [0001] The present invention relates to a method for treating harmful acid gases such as hydrogen chloride or sulfur oxides, which are generated in municipal refuse incinerators and industrial waste incinerators , power boilers (power boilers), carbonization furnaces, and combustion facilities such as private factories. In detail, the present invention relates to a method for efficiently controlling the addition amount of an alkaline agent that treats an acid gas. Background technique [0002] The exhaust gas containing harmful hydrogen chloride or sulfur oxide is treated with alkaline agents such as slaked lime or sodium bicarbonate (sodium bicarbonate), and then is dusted by a vacuum cleaner such as a bag filter (BF), and then discharged from the chimney. On the other hand, fly ash collected by a vacuum cleaner contains harmful heavy metals such as Pb and Cd, and the harmful heavy metals are stabilized before being landfilled. [0003] The alkaline agent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/81B01D53/40B01D53/68B01D46/02G05B11/42
Inventor 益子光博
Owner KURITA WATER INDUSTRIES LTD