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Preparation method of flue gas treatment absorbent

A technology of flue gas treatment and absorbent, applied in the field of DCS, which can solve the problems of complex system and high cost of system equipment

Inactive Publication Date: 2010-02-10
SHANGHAI EASTERN ELECTRICITY AUTOMATION CONTROL SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, large-scale DCS is used in the existing absorbent preparation control, so there are disadvantages such as complex system and high cost of system equipment

Method used

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  • Preparation method of flue gas treatment absorbent
  • Preparation method of flue gas treatment absorbent
  • Preparation method of flue gas treatment absorbent

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0045] The method for preparing flue gas treatment absorbent (as shown in accompanying drawing 1), comprises functional module FB, is characterized in that, according to chemical reaction equation, calculates the incorporation amount of reaction substance and water, realizes automatic proportioning; Described module Including ratio calculation, normal ratio process control and reset; also includes the following contents:

[0046] A. According to the normal operation mode, set the lime concentration to be 13%, calculate the mixing amount of water and lime by weight ratio and according to the following formula:

[0047] The total amount of water in the preparation tank: X%=W1+W2,

[0048] in,

[0049] W1: the amount of water required for the aging reaction

[0050] W2: the amount of water required to achieve the desired concentration

[0051] ...

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Abstract

The invention relates to a preparation method of a flue gas treatment absorbent and relates to the technical field of a DCS, in particular to a method which adopts a PLC application function block (FB) for programming and can achieve control requirements for preparing the absorbent of a flue gas purification process. The method comprises the following steps: the FB calculates the doping amounts ofwater and lime in percentage by weight and prepares the total amount of water in a tank according to a chemical reaction equation: X percent = W1 + W2, wherein W1=CaO * (18 / 56), W2 = (CaO * (74 / 56)*(1-X percent)) / X percent; lime mortar is diluted so that the concentration is changed from X percent to Y percent, W3 = lime mortar * (X percent / Y percent -1); the FB comprises matching calculation, normal matching process control and manual / automatic switching, pause / recovery and sudden stop treatment. The invention utilizes a low-cost PLC, calculates the doping amounts of reaction materials and water according to the chemical reaction equation and achieves automatic matching and high reliability so as to replace a control system device of a large-scale DCS.

Description

Technical field: [0001] The invention relates to the technical field of DCS, and specifically refers to a method for programming by using a function module FB by PLC, which can realize the preparation control requirements of the absorbent in the flue gas purification process. Background technique: [0002] The limestone / lime-gypsum wet flue gas desulfurization process uses cheap and easy-to-obtain limestone as the desulfurization absorbent. The limestone is crushed and ground into powder and mixed with water to make a certain concentration of absorption slurry. In the absorption tower, the absorption slurry is contacted and mixed with the flue gas. The sulfur dioxide in the flue gas reacts with the calcium carbonate in the slurry and the blown air, and the final reaction product is gypsum. At the same time, some other pollutants in the flue gas are removed, such as dust, HCI, HF, etc. The desulfurized flue gas passes through the mist eliminator to remove the fine droplets, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50G05D11/04G05D11/13
Inventor 吴平
Owner SHANGHAI EASTERN ELECTRICITY AUTOMATION CONTROL SYST
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