1241 results about "Rotary furnace" patented technology

The invention provides a method for improving quality of brown coals with an externally heated rotary furnace. The method comprises the following steps: drying and desorbing a raw material brown coals at a temperature of 100 DEG C to 300 DEG C in a rotary drying furnace; thermally cracking the dried and desorbed brown coals in a rotary carbonization furnace; heating and keeping the brown coals at a temperature of 450 to 700 DEG C through hot air from an outer jacket for thermal cracking for 40 min to 2 h; as for semi coke obtained after thermal cracking, quenching the resultant semi coke in a rotary cooling furnace and allowing the semi coke to pass through a screening device so as to obtain a finished product of semi coke with different particle sizes; as for high temperature crude coal gas containing tar obtained after thermal cracking, allowing the resultant high temperature crude coal gas containing tar to pass through a tar separating and purifying device so as to obtain a finished product of tar with high quality and a finished product of coal gas with a high calorific value, delivering one part of the finished product of coal gas and air into a combustion furnace for combustion, and delivering the combusted hot flue gas back to the jacket of the rotary carbonization furnace as a heat source. The invention enables the utilization rate of the raw material brown coals and the available value of the coal gas to be improved and treating capacity of a purifying device for coal gas to be reduced; dry quenching of coke is employed and the discharge of the coke is continuous, thereby improving the quality of semi-coke, saving energy and reducing generation of harmful gas.

The invention relates to a round bland in a new type of steel and a manufacturing process. An oil bushing, in particular P110 high-steel level oil bushing, is used for deep well and environment having complicated layer conditions, and requires higher demand on quality of round tube blank for the oil bushing. At present, there mainly are C-Mn steel serial, Mo-containing steel serial, the C-Mn steel serial are more economical but relatively more inferior in intensity, toughness and metallurgical structure of the steel; the Mo-containing steel serial has good intensity, toughness and high temperature resistance but with cost thereof being increased dramatically. The invention uses a measure that control C content, higher Mn content and adds a particular amount of Cr, which meets the demand of intensity of the steel pipe, and the invention designs new type of steel and the manufacturing process thereof. The main components are (based on weight percent): C=0.28-0.34%, Si=0.20-0.35%, Mn=1.40-1.80%, Cr=0.25-0.34%, P is not more than 0.025%, S is not more than 0.025%, Al=0.01-0.03%, and Fe in equilibrium amount, diameter of the round blank is 150 to 200 mm; the invention employs the procedures of top-bottom re-blowing rotary furnace-LF refining furnace-VD vacuum refining furnace-round blank continuous caster-turn-over cooling bed-checkup-warehousing.