Dry-process cement firing system

Abstract

The invention discloses a dry-process cement firing system. The system comprises a decomposing furnace body, a reduction chamber is arranged at the lower end of the decomposing furnace body, a kiln tail smoke chamber is arranged at the lower end of the reduction chamber, a rotary cement kiln is arranged at one end of the kiln tail smoke chamber, and a fuel adding chamber is arranged at the end, away from the kiln tail smoke chamber, of the rotary cement kiln. A cooling machine is arranged at the lower end of the fuel adding chamber, a secondary air pipe is connected between the cooling machineand the rotary cement kiln, a tertiary air pipe is connected between the cooling machine and the decomposing furnace body, a kiln-entering raw material pipe connected with the kiln tail smoke chamberis arranged at the bottom end of a five-stage preheater, and a cement raw material adding port is formed in the five-stage preheater. The furnace wall of the decomposing furnace body is composed of ashell, a first heat insulation layer, a connecting felt layer, a second heat insulation layer and a refractory brick layer. Through the system, the temperature in a decomposing furnace in the cementfiring system is guaranteed, and the energy-saving effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of cement production equipment, in particular to a dry-process cement firing system. Background technique [0002] The core equipment of the dry process cement production system is the calciner. A calciner with excellent performance plays a key role in significantly reducing equipment investment, increasing adaptability to inferior raw materials, reducing energy consumption and stabilizing production. Decomposition technology outside the kiln has been used in cement industry for nearly 30 years, and the production technology of new dry process cement has developed very rapidly, and the types of decomposition furnaces have also developed to more than 30 types. [0003] However, the calciner should take into account the application of precise automation and intelligent measurement and control equipment matched with low-nitrogen combustion technology, and it is necessary to make better use of low NO x The nitr...

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Problems solved by technology

[0003] However, the calciner should take into account the application of precise automation and intelligent measurement and control equipment matched with low-nitrogen combustion technology, and it is necessary to make better use of low NO x The nitrogen reduction and denitrification effect of emission control technology, and at the same time, in order to supply fuel and raw meal combustion, it is necessary to pass tertiary air into the calciner, which increases the oxygen content, so it is impossible to carry out NO in the calciner. x restoration of

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