A force ground caco 3 On-line decomposition high temperature flue gas desulfurization method and device

Abstract

The invention discloses a forced grinding CaCO 3 On-line decomposition high-temperature flue gas desulfurization method and device. Using CaCO 3 As a desulfurizer, the heat energy of high-temperature flue gas is used to convert CaCO 3 On-line decomposed into CaO and combined with SO 2 In the process of reaction and desulfurization, the grinding disc is used to rotate and grind to break the CaSO wrapped on the surface of CaO particles 3 Product shell, elimination of CaO and SO 2 hindrance to further reactions. The desulfurization reaction is carried out in an integrated reactor, including CaCO 3 Decomposition area, desulfurization section, furnace bridge, grinding disc, high-temperature flue gas without desulfurization enters the desulfurization section for desulfurization reaction, and high-temperature flue gas after desulfurization enters the CaCO 3 The decomposition zone continues to complete the CaCO 3 Decomposition, and then discharged through the flue gas outlet into the follow-up process. The present invention uses high-temperature flue gas to implement CaCO 3 The on-line decomposition of CaO by forced grinding is used to update the surface of CaO, so that the desulfurization agent is fully utilized, greatly improving the desulfurization efficiency, while ensuring the purity of the desulfurization product gypsum, reducing the cost of desulfurization, and the device is simple in structure and easy 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, and provides a method for CaO powder to desulfurize when the temperature is less than 850 ° C. However, 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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