Method and device for desulfurization of high-temperature flue gas through forced grinding and on-line decomposition CaCO3

Abstract

The invention discloses a method and a device for desulfurization of high-temperature flue gas through forced grinding and on-line decomposition CaCO3. According to the invention, CaCO3 is adopted asa desulfurizing agent and is decomposed into CaO on line through heat energy of high-temperature flue gas, and CaO reacts with SO2; and in the desulfurization process, a grinding disc is adopted for rotary grinding so as to break a CaSO3 product shell layer wrapping the surfaces of CaO particles, so obstruction in the further reaction of CaO and SO2 is eliminated. A desulfurization reaction is carried out in an integrated reactor which comprises a CaCO3 decomposition zone, a desulfurization section, a grate bridge and the grinding disc; high-temperature flue gas which is not desulfurized enters the desulfurization section for the desulfurization reaction; and the desulfurized high-temperature flue gas enters the CaCO3 decomposition zone to continue decomposition of CaCO3 and then is discharged through a flue gas outlet to enter a subsequent process link. According to the invention, online decomposition of CaCO3 is carried out by utilizing the high-temperature flue gas, and surface updating of CaO is realized by utilizing forced grinding, so the desulfurizing agent, namely CaCO3 is fully utilized, desulfurization efficiency is greatly improved, the purity of the desulfurization product gypsum is guaranteed, and desulfurization cost is reduced; and the device is simple in structure and convenient to implement.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a forced grinding CaCO 3 On-line decomposition high-temperature flue gas desulfurization method and device. Background technique [0002] High-temperature gas from the coal gasification industry, high-temperature gas from blast furnaces and converters in the metallurgical industry, high-temperature tail gas from the glass industry, and high-temperature waste gas from waste incinerators contain a large amount of SO 2 with NO X Harmful components, such as acid rain and photochemical pollution, will cause atmospheric environmental problems, seriously endangering the ecological environment and human health. cut SO 2 emissions to control atmospheric SO 2 Pollution and the protection of atmospheric environment quality are one of the important issues of my country's environmental protection at present and for a long time to come. [0003] Flue gas desulfurization i...

AI Technical Summary

Problems solved by technology

The disadvantages are high infrastructure investment costs, large water consumption, and corrosive desulfurization wastewater.

The dry desulfurization system uses the desulfurizer CaCO 3 Slurry changed to spray into CaCO 3 Powder, fast reaction speed, low processing cost, easy to handle desulfurization products, but low desulfurization efficiency, spray humidification can improve desulfurization efficiency, but it is easy to form wet ash and slurry lumps, resulting in poor system operation

Patent document CN101311628 discloses a flue gas calcium injection desulfurization process in a circulating fluidized bed boiler, which provides a method for CaO powder to desulfurize when the temperature is less than 850 ° C, but the price of CaO is relatively high, and CaCO 3 More price competitive advantage, so use CaCO 3 Replacing CaO as a desulfurizer is a recent concern, but the technology is still in the development stage and has not been widely used commercially

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