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Acidic gas treatment method

A technology of acid gas and treatment method, which is applied in the direction of separation method, chemical instrument and method, and controller with specific characteristics, etc., which can solve the problems of poor acid gas treatment, inability to deal with, and failure to take into account the measurement delay of measuring devices, etc., to achieve surplus Added effects for reducing, stabilizing, improving measurement latency

Active Publication Date: 2012-05-16
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

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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

The invention provides an acidic gas treatment method. During the feedback control, no new and expensive acid gas measuring device is imported, while the poor treatment of acid gas caused by the delayed measurement of the acid gas measuring device is improved. Meanwhile, the excessive adding of an alkali agent is reduced. The acidic gas treatment method comprises the step of setting the slope ranges of the concentrations of at least two acidic gases; a step of setting the control target values of the concentrations of the acidic gases according to the two slope ranges; and the step of calculating the control output valve of the adding amount of an alkali agent, according to the measured signals of the acidic gases and the control target values of the concentrations of the acidic gases. During the step of setting the control target values of the concentrations of the acidic gases, the control target values set when the slope ranges of the concentrations of the two acidic gases are relatively large (which means that the acidic gases have an increased tendency) are smaller than the control target values set when the slope ranges of the concentrations of the two acidic gases are relatively small (which means that the acidic gases have an decreased tendency).

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, 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] Exhaust gas containing harmful hydrogen chloride or sulfur oxide is treated with alkaline agents such as slaked lime or sodium bicarbonate, and then dust is removed by vacuum cleaners such as bag filters (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 for treating acid gas, that is, sodiu...

Claims

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Application Information

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