A treatment system for fluorine-containing flue gas and its application method

Abstract

The invention relates to a fluorine-containing flue gas treatment system and an application method thereof. The treatment system comprises a heat-exchange decreased-speed dedusting system and / or a decreased-speed dedusting system; the heat-exchange decreased-speed dedusting system comprises a heat-exchange device, a pipeline formed by a linear material A1-1 and a filler arranged in the pipeline; the decreased-speed dedusting system comprises a pipeline formed by a linear material A1-2 and a filler arranged in the pipeline. The application method comprises that temperature monitoring is carriedout on fluorine-containing flue gas, if the temperature is larger than or equal to 300 DEG C, the fluorine-containing flue gas is introduced into the heat-exchange decreased-speed dedusting system, and if the temperature is smaller than 300 DEG C, the fluorine-containing flue gas is introduced into the decreased-speed dedusting system; then the speed velocity and the dust content of gas coming out from the heat-exchange decreased-speed dedusting system are detected, and the gas is determined to be sent to the decreased-speed dedusting system or an absorption purification system based on the detection results; and flue gas coming out from the absorption purification system is evacuated if reaching the standard, and is sent to a purification dedusting system if not reaching the standard. The fluorine-containing flue gas treatment system has reasonable design, long service life, a wide application range and a heat recovery rate, and is convenient for large-scale industrial application.

Description

technical field [0001] The invention belongs to the technical field of fluorine-containing flue gas treatment, and in particular relates to a treatment system for fluorine-containing flue gas and an application method thereof. [0002] technical background [0003] With the passage of time, our country has entered a period of rapid social development, and various traditional metal materials, non-metal materials and emerging materials have been widely used. This has also brought about many environmental problems, among which the treatment of the original fluorine-containing flue gas, fluorine-containing waste residue, and fluorine-containing flue gas generated during the wastewater treatment process has attracted everyone's attention. If the fluorine element in the flue gas is effectively recycled and utilized through a suitable and reasonable method, it will not only solve the environmental pollution problem caused by it, but also bring better economic benefits. [0004] At ...

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Problems solved by technology

Among them, the wet method is divided into acid method and alkali method, both of which use solution as the medium to absorb fluoride in fluorine-containing flue gas, but due to the limited absorption capacity of the medium, the requirements for gas are strict, and a large amount of liquid needs subsequent treatment. Severe corrosion of equipment and other problems limit its large-scale use

The dry method is to use substances with adsorption capacity to adsorb fluoride in the fluorine-containing flue gas. This method solves the problem of subsequent liquid treatment in the wet treatment process, and reduces the requirements for equipment to a certain extent; On the basis of dry treatment, in order to improve the treatment efficiency of fluorine-containing flue gas, researchers have optimized its equipment structure, adsorption materials and treatment process, but there are still large-scale treatment equipment and large equipment footprint. Issues such as non-centralized treatment of high-temperature fluorine-containing flue gas and low-temperature fluorine-containing flue gas

In addition, for the current dry treatment of high-temperature fluorine-containing flue gas, the service life of the equipment used is generally not long, and it is difficult to replace

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