A dry deacidification and decoking method for hot blast stove waste gas

Abstract

The invention discloses a dry deacidifying and detarring method for waste gas of a hot-air furnace. The dry deacidifying and detarring method includes that the temperature of the hot-air furnace is stabilized, the temperature, the humidity and the acidity of high-heat mixed stench at an outlet of a rotary kiln are kept constant, calcium hydroxide powder is mixed with the high-heat mixed stench in a ratio, and a primary deacidifying and detarring process and a secondary deacidifying and detarring process are combined with the traditional mature technologies such as bag dedusting, forced condensation, self-cleaning circulating biological bacterium swallowing type deodorization, CU photolytic deodorization and activated carbon adsorption deodorization complementarily, so that deacidifying and detarring in household garbage carbonization treatment are achieved thoroughly. The dry deacidifying and detarring method for the waste gas of the hot-air furnace has the remarkable advantages that tar and stench are eradicated thoroughly, up-to-standard zero emission of high-heat mixed stench is achieved thoroughly, and complete resource utilization, innocuous disposal and zero-emission production of household garbage are achieved.

Description

technical field [0001] The invention relates to the technical field of environmental protection treatment of municipal garbage, in particular to a dry deacidification and decoking method for exhaust gas from a hot blast stove. Background technique [0002] With the rapid development of the global economy and industrialization, the scale of cities continues to expand, and the total amount of municipal solid waste is increasing day by day. In the process of industrialized disposal of municipal solid waste, in order to achieve reduction and complete disposal of waste, incineration and There are two ways of landfilling. At the same time, it brings hidden dangers that cannot be eradicated: secondary pollution problems of waste water, waste gas, and waste residue. In particular, most cities in China are currently suffering from the inability to effectively dispose of domestic waste. Waste disposal has become a huge challenge for China's sustainable development. [0003] Due to t...

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Problems solved by technology

[0007] Disadvantages: ①The incineration tail gas contains a large amount of particulate matter, sulfur oxides SOx, nitrogen oxides NOx, heavy metals, dioxins and other "odor" pollutants that cannot be effectively treated. The residue contains a large amount of heavy metals and cannot be disposed of harmlessly. ③Wet deacidification by lime water spraying requires effective disposal of sulfur dioxide, because its exhaust temperature in the tail gas is too high (300 degrees), and tar cannot be removed in a vaporized molecular state. Adhesion is too poor and has a principle state similar to lubricating oil

[0011] Disadvantages: ①Water spraying method for dedusting and cooling, large amount of wastewater treatment, ②The odor contains a large amount of tar that cannot be eradicated, and cannot be deodorized by biological bacteriophage (bacteria are most afraid of oil), tar adheres to the ultraviolet light tube, causing light The efficiency of ozone depletion drops greatly, the adsorption of activated carbon cannot be carried out at all, and the odor cannot be eradicated

③High temperature sulfur dioxide gas produced by coal combustion, combined with spray water (SO2+H2O=H2SO3) sulfurous acid water increases the difficulty of wastewater treatment

[0012] Therefore, in view of the shortcomings and application limitations of the above-mentioned method, the present invention provides a method for deacidification and decoking of odor in the carbonization process of household garbage in a hot blast stove, so as to facilitate the elimination of odor in the treatment of household garbage in the later stage. Harmless and zero emission

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