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  Double shaft kiln

  The calcination mechanism of the double shaft kiln is full parallel flow calcination, with high lime activity and various fuels, such as natural gas, gas, oil and pulverized coal. The minimum particle size of limestone is 15mm, and the activity is over 360ml. The double shaft kiln is operated by sealed positive pressure, and the working pressure is about 40kpa. We have adopted a series of new technology applications in the double shaft kiln to solve the technical shortcomings, including: according to the decomposition temperature of raw materials, reasonably determine and control the flue gas temperature and flow rate in the connecting channel, avoid the liquid phase generation of ash, reduce the coating adhesion of low melting materials, and reduce the scaling risk of the connecting channel; adopt SNCR technology in the channel and flue gas external circulation technology to reduce the NOx emission in flue gas.

  The picture shows the 300tpd double shaft kiln of Zhangjiagang Wonjin Industrial Materials Co., Ltd. constructed by Sinocalci on EPC basic. Its environmental protection conditions and lime quality are in the advanced level of domestic double shaft kiln.

  
  

  Main technical parameters：

  Number	Item	Parameter value
  1	Lime grade	class a
  2	output（t/d）	150--800
  3	Thermal principle of calcination	parallel flow
  4	Lime activity（ml）	≥360
  5	Particle size of raw materials（mm）	25--120
  6	Fuel type	natural gas, gas, coal, heavy oil
  7	calcination temperature（℃）	1100--1200
  8	Annual working days（d）	340

  We provide：

  Investment estimate of double shaft kiln project, preliminary design and construction drawing design of double shaft kiln, supply and complete set of equipment and instruments, domestic and international procurement, construction and installation supervision, kiln commissioning and personnel training, technical innovation and technical consultation of existing double shaft kiln.