Sensitive and economical wet desulphurization outlet flue gas SOx concentration control method

A technology for wet desulfurization and control methods, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as affecting applications and immaturity of variable frequency pumps, improving energy efficiency, adjusting process sensitively, and avoiding slurry supply flow. The effect of exceeding demand

Active Publication Date: 2021-10-22
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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  • Application Information

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Problems solved by technology

However, the use of variable frequency pumps for regulation is still immature, and there are a series of problems that affect the application

Method used

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  • Sensitive and economical wet desulphurization outlet flue gas SOx concentration control method
  • Sensitive and economical wet desulphurization outlet flue gas SOx concentration control method

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Embodiment Construction

[0036] In the present invention, all the representations of "the amount of XX" can be expressed in various ways such as volume, mass, and amount of substance, and it is only necessary to ensure that the dimension is correct during the calculation process. Similarly, "XX's flow" can be expressed in various ways such as volume flow, mass flow, and substance flow; "XX's concentration" can be expressed in various ways such as volume fraction, mass concentration, and substance concentration. To proceed, it is only necessary to ensure that the dimensions are correct during the calculation.

[0037] In this embodiment, all "amount of XX" is mass, all "flow rate of XX" is mass flow, and all "concentration of XX" is mass concentration. SO X to SO 2 to count, the remaining types of SO X can be ignored.

[0038] Such as figure 1 As shown, a sensitive and economical wet desulfurization outlet flue gas SO X Concentration control method for controlling flue gas SO at the outlet of absor...

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Abstract

The invention relates to the technical field of waste gas purification through a semi-liquid phase method, and discloses a sensitive and economical wet desulphurization outlet flue gas SOX concentration control method which is used for controlling the SOX concentration of flue gas at an outlet of an absorption tower when a gypsum method is adopted for desulfurization, and the spraying amount is changed by controlling the frequency of a variable frequency pump through a prediction controller, so that theSOX concentration of flue gas at the outlet of the absorption tower is adjusted; the prediction controller overcomes the hysteresis quality from frequency conversion to the change of the SOX concentration of the flue gas at the outlet of the absorption tower, so that the adjusting process is more sensitive, red line operation of the desulfurization device can be realized, the SOX concentration of the flue gas at the outlet of the absorption tower is prevented from exceeding the standard in the adjusting process, and the slurry supply flow is prevented from exceeding the demand after the adjustment; and through closed-loop optimization, the variable-frequency pump runs close to the lower limit of the variable-frequency range when the SOX concentration of the flue gas at the outlet of the absorption tower is stable, a large adjusting space is reserved for the single variable-frequency pump, and the adjusting requirement can be met by adopting the single variable-frequency pump.

Description

technical field [0001] The invention relates to the technical field of exhaust gas purification by semi-liquid phase methods, in particular to a sensitive and economical wet desulfurization outlet flue gas SO X concentration control method. Background technique [0002] Wet desulfurization using lime / limestone slurry as absorbent is the main method for flue gas desulfurization in coal-fired power plants. [0003] In the current desulfurization device, part of the slurry that has been in contact with the flue gas is mixed with the new slurry, and then pumped back to the absorption tower for spraying by a circulating pump, thereby increasing the liquid-gas ratio and making full use of the absorbent. The single-tower double-circulation device is the mainstream desulfurization device. The absorption tower is divided into two sections by the collection bowl, and each section is equipped with a set of slurry circulation loops. In the two slurry circulation loops, the pH value of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50G06F30/27
CPCB01D53/502B01D53/346G06F30/27B01D2251/404B01D2251/602B01D2258/0283G06F2119/02Y02A50/20
Inventor 张启玖
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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