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Rotary kiln

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 Active lime rotary kiln

Active lime rotary kiln

Product introduction: municipal solid waste, also known as municipal solid waste, refers to the solid waste produced by urban residents in their daily life or activities providing services for urban daily life. The composition of municipal solid waste (MSW) is complex and changeable, and it is affected by the geographical location of the garbage producing area

Hotline: eighteen billion six hundred and thirty-seven million three hundred and two thousand and ninety-nine

Details

     

Active lime rotary kiln

[product introduction]: Limestone is heated to about 900 ° C by flue gas from 1150 ° C kiln in preheater, about 30% of which is decomposed and pushed into rotary kiln by hydraulic push rod. Limestone is decomposed into Cao and CO2 by sintering in rotary kiln. The limestone generated after decomposition enters the cooler, and the cold air is blown into the cooler

The limestone of the preheater is transported to the top of the hoister. In the top bin of the preheater, the feeding amount is controlled by the upper and lower level meters, and then the limestone is evenly distributed to each chamber of the preheater through the feeding pipe.
Limestone is heated to about 900 ° C by flue gas from 1150 ° C kiln in preheater, about 30% of which is decomposed and pushed into rotary kiln by hydraulic push rod. Limestone is decomposed into Cao and CO2 by sintering in rotary kiln. The limestone generated after decomposition enters the cooler and is cooled to below 100 ° C by the cold air blown in the cooler and discharged. After heat exchange, the hot air at 600 ° c enters the kiln and is mixed with gas for combustion. The waste gas is mixed into the cold air, then enters the bag filter through the induced draft fan, and then enters the chimney through the exhaust fan.
The lime from the cooler is sent to the finished lime silo by vibrating feeder, chain bucket conveyor, bucket elevator and belt conveyor.
Technical features:
(1) The preheater can take away the waste heat of the flue gas and reduce the flue gas discharge temperature to below 280 ℃.
(2) The length diameter ratio of rotary kiln is reduced from 20-25 to 14-15. The shortening of the length not only reduces the heat lost from the surface of the rotary kiln to the surrounding area, but also reduces the occupied area of the equipment.
(3) The shaft cooler is used to replace the original cooling cylinder in the kiln head discharge cooling, so as to avoid the sensible heat loss of lime. The hot lime falling from the kiln head is cooled by exchanging heat with the secondary air. The air absorbs the heat and enters the rotary kiln to support combustion after the temperature rises.
(4) The cooler and kiln head cover adopt integrated vertical design, which occupies less space and has good sealing performance, which avoids the unorganized emission of hot waste gas.
(5) Combustion supporting air is divided into primary air and secondary air. The primary air is directly involved in combustion, and the secondary air is cooling air. The primary air and secondary air are respectively supplied by separate fans. The design of the secondary air temperature can be up to 600 ℃ as combustion supporting air, which provides favorable conditions for fuel saving.
(6) The special combustion system is used to supply heat to the rotary kiln. In addition to using pulverized coal as fuel, low calorific value gas (such as producer gas, calcium carbide tail gas and semi coke gas) can be used as calcination fuel, or multiple fuels can be used simultaneously. The calcination temperature can be adjusted by adjusting the air and gas flow.
(7) Environmental protection measures are perfect. Pulse bag filter is used for dust removal of calcined tail gas, which meets the national emission standard. The bag filter is also used in the drop point of the vertical cooler.
(8) High level of automation. The adjustment, control and alarm of the production operation of the calcination system equipment are centralized controlled by PLC in the main control room. The screen display of each control point and the necessary interlocking monitoring are set. The operation parameters used in the production process are recorded automatically and can be printed at any time.  
 
Technical parameters of active lime rotary kiln:
 Lime shaft kiln
      

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