A urea pyrolysis ammonia production device and ammonia production process for cement kiln denitrification
A cement kiln and denitrification technology, which is applied in the field of flue gas denitrification, can solve the problems of low operation and maintenance costs, poor adaptability, and low denitrification efficiency, and achieve reduced operation and maintenance costs, poor adaptability, and low denitrification efficiency. Effect
Active Publication Date: 2019-02-19
OLD AGE EXPERT DESIGN INST OF XIAN XIBEI ELECTRIC POWER DESIGN INST
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Problems solved by technology
[0003] In view of the above problems, the present invention provides a urea pyrolysis ammonia production device for cement kiln denitrification, which is easy to operate and can effectively solve the problems of poor adaptability and low denitrification efficiency of using urea as an amino reducing agent for cement kiln denitrification. problem, without additional energy consumption and low operation and maintenance costs, the present invention also provides a urea pyrolysis ammonia production process for cement kiln denitrification
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[0016] Such as figure 1 , figure 2 As shown, a urea pyrolysis ammonia production device for denitrification in cement kiln includes a kiln head cover 1, a rotary kiln 2, a tertiary air duct 3, and a decomposition furnace 4. The calcination temperature of cement clinker in the rotary kiln 2 is about 1400°C. The temperature of the gas discharged through the kiln head cover 1 is above 700-800°C. As a natural heat source, the kiln head of the rotary kiln 2 is connected with the kiln head cover 1, and the tail of the rotary kiln 2 is connected with the calciner 4. The hot air comes from the kiln head area , the pyrolysis furnace 6 is arranged at the kiln tail. The distance from the kiln head to the kiln tail in this embodiment is 75m, and the distance from the kiln head to the kiln tail is actually determined according to different production lines. The gas flow direction in the kiln is from the rotary kiln to the kiln tail. 2 Kiln head flows to the rotary kiln 2 kiln tail, and f...
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Abstract
The invention provides a urea pyrolysis ammonia production device for cement kiln denitrification, which is easy to operate and can effectively solve the problems of poor adaptability and low denitrification efficiency of using urea as an amino reducing agent for cement kiln denitrification, without additional Increased energy consumption, low operation and maintenance costs, the present invention also provides a urea pyrolysis ammonia production process for cement kiln denitrification; including kiln head cover, rotary kiln, tertiary air duct, calciner, the rotary kiln kiln head It is connected with the kiln head cover, the kiln tail of the rotary kiln is connected with the calciner, and the tertiary air pipe is connected between the kiln head cover and the calciner. It is characterized in that: the blower is arranged in the rotary kiln At the kiln head, a heat exchange coil is arranged inside the kiln head cover, the blower is connected to the inlet of the heat exchange coil through a cold air pipe, and the outlet of the heat exchange coil is connected to the rotary kiln through a hot air pipe The pyrolysis furnace at the kiln tail, the pyrolysis furnace is connected to the decomposition furnace through an ammonia pipeline.
Description
technical field [0001] The invention relates to the technical field of flue gas denitration, in particular to a urea pyrolysis ammonia production device and an ammonia production process for cement kiln denitration. Background technique [0002] At present, cement kiln denitrification technologies mainly include low-nitrogen combustion and selective non-catalytic reduction (SNCR) technology. Among them, SNCR is a widely used denitrification method. React with nitrogen oxides in the flue gas to generate nitrogen and water; currently, the commonly used amino reducing agents for flue gas denitrification include liquid ammonia, ammonia water and urea, among which liquid ammonia is a major hazard substance and is rarely used in cement kilns. Ammonium reducing agents commonly used in cement kilns are ammonia water and urea. Ammonia is dissolved in water to obtain ammonia water. The concentration of commercial ammonia water is generally 20% to 30%, which is still dangerous and irri...
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IPC IPC(8): C01C1/08B01D53/76B01D53/56
CPCB01D53/56B01D53/76B01D2251/2062C01C1/086
Inventor 杨倩金良孙志翱尤毓敏林育平俞元元
Owner OLD AGE EXPERT DESIGN INST OF XIAN XIBEI ELECTRIC POWER DESIGN INST