Ammonium-method semi-dry-method desulphurization device and method for dry-method cement kiln

Abstract

The invention discloses an ammonium-method semi-dry-method desulphurization device and method for a dry-method cement kiln. The device comprises an ammonium water storage system, an ammonium water conveying and metering system, a compressed air device, an ammonium water atomizing device and a programmable control device, wherein the ammonium water storage system comprises an ammonium water storage tank, an ammonia discharging module and a process water tank; the ammonium water conveying and metering system comprises an ammonium water buffer tank, an ammonium water conveying module, a desulfurization and ammonia supplementing module and an ammonium water metering module. The method is characterized in that ammonium water is sprayed to a preheater body of a cement kiln system through an ammonium water atomizing device and into the smoke rising channel of the preheater; in the preheater of the cement kiln system, ammonium water and SO2 in smoke react to generate ammonium sulfate salt. The ammonium-method semi-dry-method desulphurization device and method is high in desulphurization efficiency, high in ammonium water utilization rate, simple to operate, high in automation level, low in investment cost, and the like.

Description

technical field [0001] The invention relates to the field of environmental protection treatment of industrial flue gas desulfurization, in particular to a dry-process cement kiln ammonia-process semi-dry desulfurization device and method. Background technique [0002] The emission standards of air pollutants in the cement industry have been raised again in recent years. On December 27, 2013, for the cement industry, the state issued a more stringent smoke emission standard "Emission Standards for Air Pollutants in the Cement Industry" (GB4915-2013), which stipulates that smoke The emission concentration of SO2 in the air should be controlled below 200mg / Nm3, and it should be controlled at 100mg / Nm3 in key areas. Therefore, cement kiln flue gas desulfurization has been gradually paid attention to. [0003] The sulfur element in the new dry process cement kiln production system mainly comes from fuel (coal) and raw material (limestone ore). The SO2 produced by the combustion...

AI Technical Summary

Problems solved by technology

If such desulfurization devices and processes are directly applied to cement kiln flue gas desulfurization, it will be difficult for the factory to accept the initial investment, operation and maintenance costs, etc.

For example, the wet desulfurization process (limestone-gypsum method) is not suitable for the situation where the flue gas SO2 of most cement plants is slightly higher than the emission standard of flue gas pollutants; dry desulfurization (calcium spraying in the furnace) is not suitable for cement kilns , because the cement kiln production process itself contains a large amount of calcium-based raw materials, the effect of additional calcium desulfurization is not obvious; when the semi-dry desulfurization (spray drying method) is applied, it is necessary to select multiple desulfurizer injection points to ensure the overall desulfurization of the flue gas Effect

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