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Process flow & production method
A whole production line is composed of vertical heater, rotary kiln, grate cooler, gas treating system, raw conveying system, finished product conveying system, raw coal grinding system. The whole line utilizes DCS central control system with advanced technology and stable performances, and it is centrally managed in main control room.
Main equipment
|
No. |
Equipment name |
Sepc. |
Type |
QTY |
|
1 |
Rotary kiln |
?4.0?0m |
|
1 |
|
2 |
Vertical heater |
?10.5?.5m |
|
1 |
|
3 |
Vertical cooler |
105m? |
4.2*9m |
1 |
|
4 |
Multi-pipes cooler |
Processing air volume:260000m3/h |
|
1 |
|
5 |
High temperature gas exhaust fan |
900kw,10KV |
|
1 |
|
6 |
Coal grinding system |
??8-10?
8-10t/h |
PDM1250 |
1 |
|
7 |
Coal gas & coal burning system |
|
Four-way burner |
1 |
|
8 |
Dust collecting equipment |
|
8.1 |
Dust collecting at kiln tail |
Treating air volume:260000m3/h |
LCMD-3660 |
1 |
|
8.2 |
Dust collecting for coal grinding |
Treating air volume:45000m3/h |
FGM128-6(M) |
1 |
|
8.3 |
Dust collecting for cooler |
Treating air volume:18600m3/h |
PPc64-4 |
1 |
|
8.4 |
Screening & dust collecting of finished product |
Treating air volume:18600m3/h |
PPc64-4 |
1 |
|
9 |
Auxiliary equipment |
|
9.1 |
Bucket elevator |
|
NE100 |
1 |
|
9.2 |
Round vibrating screen |
|
YA1536 |
1 |
|
9.2 |
Round vibrating screen |
|
YA1236 |
1 |
|
9.4 |
Chain type apron conveyor |
|
DS500 |
1 |
|
9.5 |
Belt conveyor |
|
|
6 |
|
10 |
Fan |
|
10.1 |
Axial-flow fan |
|
|
4 |
|
10.2 |
Centrifugal fan |
|
|
2 |
|
10.3 |
Coal grinding fan |
|
|
1 |
|
10.4 |
Roots blower |
|
|
3 |
|
|
|
|
|
|
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Description of process flow
1 Raw material storing & conveying
Limestone with grain size of 20-40mm will be deliveried from mineral to plant area, stored in material yard, material will be sent into B1000 large inclination belt conveyor via electromagnetic vibrating feeder from lower part of material yard after washing, after screening, the qualified product with grain size larger than 10mm will be senti into crushing bin via belt conveyor, crushed material with grain size less than 10mm will be sent into powder bin and qualified limestone will be sent into material bin of preheater via B800 large inclination belt conveyor.
2 Limestone calcination
Limestone calcination system is composed of one ?10.5?.5m vertical preheater, ?4.0?0m rotary kiln and fixed gravity type vertical cooler, capacity is 600tpd, heat consumption is 5.75GJ/t?material will be guided into preheater via discharge chute meanwhile high temperature gas from rotary kiln will preheat material up to 600-800?, limestone will be decomposed partly, then 12pcs hydraulic push rod will push them into tail of rotary kiln in turn, then they will be discharged into vertical cooler after high temperature calcination, after that, material will be cooled to less than normal temperature +65?, then they will be discharged from cooler, incoming air of vertical cooler will be used as second air for rotary kiln burning.
3 Finished product conveying
Finished lime will be sent to top of finished product bin by NE500 bucket elevator via chain conveyor after discharged from cooler, after screening, qualified product with grain size larger than 5mm will be sent into active lime material bin via belt conveyor, material with grain size less than 5mm will be sent into powder bin and set electrical discharge valve under the active lime bin and powder bin.
4 Gas treating
High temperature gas produced by rotary kiln burning, limestone will have heat exchange inside of heater, temperature will decrease under 280?, then gas temperature will decrase to under 200? after cooling by multi-cooler, and then gas wil be exhausted into atmosphere via high temperature fan via bag filter whose dust density will be less than 50mg/m3 .
Quality control
Take following measures to implement full-side quality management in order to keep the quality:
(1)In order to select the raw material, improve the quality of inlet limestone to ensure the inlet grain size to meet the requirement (if necessary, consider to utilize washed limestone)
(2)Incoming raw material should be tracking tested to ensure that the chemical compostion of raw material will meet the requirements.
(3)During the production process, strengthen quality management, make the external quality standard of enterprise, gradually reach international standard (ISO9002 certificate), improve the staff quality and quality mind and set the quality inspector to strengthen self-checking work. | 
