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Hoping this mail finds you fine We are Attaka Co. for manufacturing Gypsum powder, and we are now preparing for the production line and we need a quotation for Indirect Hot Air Generator (Fuel is natural gas) with the below specifications; The HAG is used to dry white gypsum thru a rotary dryer (Dia.=1.6m, L=11m) White gypsum is fed to the dryer at a rate of 5 ~ 5.2 ton/hr (20% moisture content) and gets out at a rate of 4 ton/hr (4-5% moisture content). The result of our calculation about Indirect HAG will be the gross Heat requirements are = 1120.5Kw = 963456.57 KCaL/Hr. This Value of gross heat as a result of the Calculated the following:Estimator value of Ambient air temperature and material=16C.A) Heat to raise the temperature of the feed-stock.B)Heat to residual moisture.C)Heat to elevate excess water to boiling point.D)Heat to evaporate water @ 100C.E) Heat loss in super-heating water @ 100C.F) Heat loss from dryer (estimator value= 45 Kw), after insulation .G) Heat loss from combustion chamber (estimator value= 31.41 Kw @ difference temp. 35C) after insulation.And A) Heat loss in exhaust gasesB) Heat loss in moisture in exhaust gases. Result data of process design calculations:The gross heat requirements = 1000,000 KCaL/Hr.The Gas quantities = 19500 m3/hr@ 80C (estimator value of outlet air temperature from dryer).The inlet gas temperature =300C. combustible:Natural gas.Fan is work always with fresh air. All the values required to inlet point of the dryer. We do apprciate if you can send us an offer and the product catalogue Looking forward to hear from you Best Mohamed Ashoush *******@*****.com.