A high temperature denitration and dust removal device for cement kiln flue gas

Abstract

The invention discloses a cement kiln flue gas high-temperature denitrification and dust removal device, which comprises a reactor box and an ammonia injection device. The inside of the reactor box is divided into a left box and a right box, and a denitrification catalyst is arranged inside the right box. , an outlet pipe is connected to the right box under the denitrification catalyst, a filter frame is arranged inside the left box, several ceramic fiber filter tubes are installed on the filter frame, and an ash hopper is arranged at the bottom of the left box; The ammonia device includes a gas collecting pipe. The two ends of the gas collecting pipe are respectively connected with the left box of the reactor box through the inlet pipe. One side of the exterior of the housing is provided with a smoke injection pipe, and the other side of the exterior of the housing is provided with an ammonia injection pipe; the dust removal rate and denitrification rate of the flue gas in the present invention can reach more than 90%, which greatly reduces the impact on the atmosphere. Environmental pollution, energy saving and environmental protection, high overall operating efficiency, suitable for popularization and application in cement production enterprises.

Description

technical field [0001] The invention relates to a cement kiln flue gas high-temperature denitrification and dust removal device, which belongs to the technical field of cement kiln flue gas treatment. Background technique [0002] At present, cement production mainly adopts new dry process cement production technology, and the exhaust gas contains high pollutants such as nitrogen oxides, particulate matter, alkali metals, and heavy metals. However, the SNCR technology currently commonly used in the end treatment of flue gas in the cement industry, this The flue gas discharged by this technology can no longer meet the increasingly stringent environmental protection requirements of the cement industry. Therefore, SCR technology with higher denitrification efficiency is more and more used in the cement industry; the temperature of cement kiln flue gas after passing through the preheater is generally It is about 350°C, which belongs to the high-efficiency denitrification tempera...

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Problems solved by technology

[0002] At present, cement production mainly adopts new dry process cement production technology, and the exhaust gas contains high pollutants such as nitrogen oxides, particulate matter, alkali metals, and heavy metals. However, the SNCR technology currently commonly used in the end treatment of flue gas in the cement industry, this The flue gas discharged by this technology can no longer meet the increasingly stringent environmental protection requirements of the cement industry. Therefore, SCR technology with higher denitrification efficiency is more and more used in the cement industry; the temperature of cement kiln flue gas after passing through the preheater is generally It is about 350°C, which belongs to the high-efficiency denitrification temperature window of traditional SCR catalysts. SCR catalysts are denitrification catalysts, but there are high concentrations of dust, heavy metals and alkali metals in the flue gas of cement kilns. The high-concentration dust, heavy metals and alkali metals and other pollutants in the medium are not effective in dust removal and filtration, resulting in the omission of pollutants, and these missed pollutants can easily cause blockage, wear and poisoning of the SCR catalyst, and seriously damage the The denitrification efficiency and service life of the SCR catalyst; at the same time, due to the high concentration of dust, heavy metals and alkali metals in the flue gas of the cement kiln, the flue gas and ammonia cannot be fully mixed in the flue pipe, thereby further It affects the denitrification effect of the follow-up SCR catalyst on flue gas

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