Coking Coal Drying for Coking Plants.pptx

Coking Coal Drying for Coking Plants

1. Solutions for Coal Drying 戴耳塔干燥设备有限公司 Delta Drying Equipment Ltd Coking Coal Drying for Coking Plants

2. Solutions for Coal Drying Necessity of coking coal drying The optimal moisture content of coal cakes is 9-11% for stamping coke oven The optimal loading moisture content is 8-9% for top charging coke ovens However, the moisture content of coking coal in some coking plants varies with the seasons Therefore it is necessary to dry the coking coal to the optimal moisture content

3. Solutions for Coal Drying Coal drying process and equipment The table on the right shows the application of dryers in coal washing plants in the United States and Gagana from 1958 to 1961 Fluidized bed dryers are gradually surpassing drum dryers and other dryers

4. Solutions for Coal Drying Coal drying process and equipment Teck Resources of Canada is the only company in the world whose coking coal dryers are still in operation The following table shows the parameters of Teck Resources' coal dryers (all dryers are fluidized bed dryers that use high-temperature flue gas as a heat source) Parameters of Teck Resources Coal Dryer Flue Gas Temperature ( ºC, original design/ in operation) Coal size / mm Coking Coal Output (t/h) Water Evaporation (t/h) Deck Area (m2) GHO 600/780 0-50 900 100 20 FRO 600/750 0-50 1500 90 20 EVO 600/550 0-50 1000 70 30 LCO 600/500 0-50 550 25 10 CMO 600/400 0-50 300 15 10 CRO 600/500 0-50 400 20 10

5. Solutions for Coal Drying Coal drying process and equipment The table on the right shows the dryers used in the CMC process in Japan The DAPS process and SCOPE21 process of Nippon Steel after 1992 both used fluidized bed dryers that use flue gas as a heat source

6. Solutions for Coal Drying Coal drying process and equipment Therefore, fluidized bed dryer is the first choice for coal drying

7. Solutions for Coal Drying Delta coal drying process and equipment The flow sheet on the right is Delta's coal drying process

8. Solutions for Coal Drying Delta coal drying process and equipment Process Description The wet coal sent to the fluidized bed dryer is fluidized by superheated steam from the bottom of the fluidized bed dryer The wet coal particles in the bed contact with the outer surface of the steam heat exchanger immersed in the fluidized bed dryer by mean of fluidization The wet coal particles are heated by the steam inside the steam heat exchanger and the water from wet coal is converted into the superheated steam and then is discharged from the dryer together with the superheated steam from the bottom of the fluidized bed dryer After separated by dust separator, part of the superheated steam is sent to the bottom of the fluidized bed dryer by the circulating fan as a drying medium/fluidizing gas, and the rest is condensed into water by heat exchanger The steam to the steam heat exchanger immersed in the fluidized bed dryer is provided by the steam turbine or boiler Process characteristics Zero exhaust gas emission No dust explosion The heat transfer coefficient of the steam heat exchanger immersed in the fluidized bed dryer with superheated steam as the drying medium is 60% higher than with air as the drying medium. The equipment is small in size and low in cost ( 1 00,000 CAD /(evaporated tons of water/hour) under 8 atm steam pressure of more than, from the feed port to the discharge port of the dryer)

9. Solutions for Coal Drying Delta coal drying process and equipment The photo on the right shows the details of a fluidized bed dryer with immersed steam heat exchanger

10. Solutions for Coal Drying Delta coal drying process and equipment The photo on the right shows the shell of a fluidized bed dryer with immersed steam heat exchanger

11. Solutions for Coal Drying Delta coal drying process and equipment The photo on the right shows the steam heat exchanger immersed inside a fluidized bed dryer 490 490

12. Solutions for Coal Drying Comment or Question? [email protected] 001-6476739832 (WhatsApp) 490