A kind of low-temperature dry flue gas desulfurizer and its preparation method and application

Abstract

The invention discloses a low-temperature dry flue gas desulfurizer and a preparation method and application thereof, which are used for removing SO2 and SO3 components in the low-temperature (40-200DEG C) flue gas, and relates to the field of the flue gas desulfurization purification in coal-fired power plants, heat supply boilers, metallurgy and chemical industries. The desulfurizer comprises an active component CaO, a reaction auxiliary agent silicon source and a catalytic active component V, Fe or Co, wherein cheap quicklime is selected as the raw material of the active component, the silicon source as the auxiliary agent, comprising diatomite, bentonite, silica sol and other silicon sources, and V2O5, Fe2O3, Co2O3 or a combination thereof as the catalytic component. The desulfurizerhas the advantages of low raw material cost, good desulfurization effect, high sulfur capacity, low use temperature to normal temperature, and great breakthrough on low-temperature flue gas dry desulfurization. The desulfurizer matched with a dry moving bed desulfurization process or a fixed bed dry desulfurization process has both desulfurization and dust removal effects in the application process.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization and purification, and in particular relates to a low-temperature dry flue gas desulfurizer and a preparation method and application thereof. Background technique [0002] Coal is an important basic energy and industrial raw material, which accounts for more than 65% of my country's primary energy consumption. A large amount of coal burning produces a large amount of pollutants such as sulfur dioxide. Flue gas desulfurization is the most effective method to control sulfur dioxide pollution, and it is also a desulfurization technology commonly used in the market. [0003] The methods of flue gas desulfurization are roughly divided into three categories: wet method, that is, using liquid absorbents such as water or lye to wash the flue gas to remove sulfur dioxide; The reaction produces dry powdered calcium sulfite, which has the characteristics of both wet and dry methods; the dry...

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Problems solved by technology

[0004] Chinese patents CN102851085B, CN100348300C, CN101804297, CN2915235Y, CN1331570C, CN107441931A, CN105664706A and patent CN101898110B published dry desulfurizers, but only suitable for medium and high temperature (≥200°C) flue gas desulfurization, when applied to low temperature flue gas conditions, The desulfurization effect of the desulfurizer is greatly reduced

[0005] In "Experimental Research on Flue Gas Desulfurization of Low-Temperature Plasma Modified Composite Calcium-based Adsorbent" (Ding Weike et al., Progress in Chemical Industry, 2017, 36(3)), the author used low-temperature plasma technology to modify the surface of solid adsorbent. When evaluated at 90°C, the composite calcium-based adsorbent for SO 2 The adsorption capacity per unit mass reaches 2.5%, which is greater than the desulfurization effect of pure CaO, but the desulfurizer has a low sulfur absorption capacity and cannot meet the industrial use standard

Chinese patent CN2018106176354 discloses a renewable dry-process flue gas desulfurizer and its preparation method and application, but the formed dry-process desulfurizer is only suitable for medium-high temperature (200°C-500°C) flue gas desulfurization Under the condition, the desulfurization efficiency is greatly reduced

[0006] It can be seen that there is no desulfurizer suitable for low temperature moving bed or fixed bed dry flue gas desulfurization

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