High-temperature denitration and dust removal device for cement kiln flue gas

Abstract

The invention discloses a high-temperature denitration and dust removal device for cement kiln flue gas. The device comprises a reactor box body and an ammonia spraying device, wherein the interior ofthe reactor box body is divided into a left box body and a right box body, a denitration catalyst is arranged in the right box body, a gas outlet pipeline is connected to the right box body below thedenitration catalyst, a filtering frame body is arranged in the left box body, a plurality of ceramic fiber filter pipes are arranged on the filtering frame body, and an ash bucket is arranged at thebottom of the left box body; and the ammonia spraying device comprises a gas collecting pipe, two ends of the gas collecting pipe respectively communicates with the left box body of the reactor box body through a gas inlet pipeline, a shell is sleeved on the gas collecting pipe, a mixed flow cage body structure is rotationally connected to the gas collecting pipe in the shell, a smoke spraying pipe is arranged on one side outside the shell, and an ammonia spraying pipe is arranged on the other side outside the shell. According to the invention, the dust removal rate and the denitration rate of the flue gas are both more than 90%, the pollution to the atmospheric environment is greatly reduced, the energy is saved, the environment is protected, the overall operation efficiency is high, andthe device is 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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