Process for flue gas desulfurization by limestone/lime-gypsum wet method and double circulation loop

A technology of wet flue gas desulfurization and limestone, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., to achieve the effect of reducing project cost, strong alkalinity, and difficult treatment

Inactive Publication Date: 2006-10-11
GUODIAN TECH & ENVIRONMENT GRP
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Problems solved by technology

[0003] The purpose of the present invention is to provide a double-loop limestone / lime-gypsum wet flue gas desulfurization method, which can ensure a high desulfurization rate without increasing the number of spray layers and the height of the absorption tower, and can effectively reduce the The problem of project cost

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  • Process for flue gas desulfurization by limestone/lime-gypsum wet method and double circulation loop

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Embodiment Construction

[0024] Examples see figure 1 : The flue gas desulfurization process of the present invention: the absorbent slurry is pumped from the pulping system, first enters the upper loop slurry circulation box 4 outside the absorption tower, and the upper loop slurry circulation box is pumped by the upper loop slurry circulation pump 5 The slurry in the upper circuit is sent to the spray layer 6 of the upper circuit, sprayed down through the nozzle atomization, and the slurry contacts with the flue gas to complete the SO 2 After the absorption, it falls to the upper loop slurry collection tray 7 in the middle of the absorption tower, and finally returns to the upper loop slurry circulation box 4; part of the slurry in the upper loop slurry circulation box flows or is pumped to the bottom of the absorption tower through the connecting pipe 8. The loop slurry circulation box 1 is sent to the lower loop spray layer 3 through the lower loop slurry circulation pump 2. After being atomized b...

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Abstract

The invention relates to a dual-cycle circuit limestone / lime-gesso wet smoke desulfuration method. It uses dual-circuit adsorption tower spray system while each system has independent spray layer, slurry cycle pump and slurry collector and two slurry collector are connected via connecting tubes. Said dual-circuit adsorption tower spray system are operated in different pH, while the pH of upper circuit is between 5.5-6.8 and the pH of lower circuit is between 4-5. The invention has strong adaptability to the change of coal kinds and the change of boiler load, with lower demand for limestone slurry preparing system. It can confirm the desulfuration efficiency without adding spray layer and increasing the height of adsorption height, and it can effectively reduce the cost. The invention especially apply the purification of the smoke whose sulfur content is above than 3.5% while the desulfuration efficiency is higher than 97%.

Description

(1) Technical field [0001] The invention relates to a flue gas wet desulfurization process, in particular to a limestone / lime-gypsum wet flue gas desulfurization method and a device for purifying high-sulfur coal flue gas. (2) Background technology [0002] At present, there are many desulfurization processes in the world, including limestone / lime-gypsum wet process, magnesium desulfurization process, sodium-alkali desulfurization process, flue gas circulating fluidized bed desulfurization process, ammonia process, etc. Among these desulfurization processes, the Limestone / lime-gypsum wet method is the most widely used, with a market share of over 80%. In the limestone / lime-gypsum wet flue gas desulfurization process, there are mainly spray towers, liquid column towers and bubble towers. These three absorption towers are widely used, especially the spray tower is the most widely used. However, the bubble tower is not suitable for high-sulfur flue gas, and the load adjustment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78B01D53/80B01D53/96
Inventor 刘汉强汪德志陈玉乐
Owner GUODIAN TECH & ENVIRONMENT GRP
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