Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
174 words
In a method of producing non-abrasive coke forms of brown-coal briquettes made without a binder from coal having low coking properties in at least three stages in which the brown-coal briquettes, are sequentially, preheated, dehydrated or dried, carbonized and subsequently cooled in recirculating gas circuits in which there is recirculated gas composed substantially of burnt lean gas obtained from said carbonization of the brown-coal briquettes, with the gas recirculated in the circuits of the preheating, dehydrating or drying, and carbonizing stages being heated and the gas recirculated in the circuit of the cooling stage being cooled, the improvement comprising providing, for each of the preheating stage and the dehydrating or drying stage and the carbonization stage, a respective primary gas recirculation circuit which is separate from each other primary gas recirculating circuit and closed except for a respective connection to a source of said lean gas; and separately heating the gas in each of said respective primary gas recirculation circuits of the preheating stage and the dehydrating or drying stage and the carbonization stage.
Claim 2
Dependent Claim
174 words
In a method of producing non-abrasive coke forms of brown-coal briquettes made without a binder from coal having low coking properties in at least three stages in which the brown-coal briquettes, are sequentially, preheated, dehydrated or dried, carbonized and subsequently cooled in recirculating gas circuits in which there is recirculated gas composed substantially of burnt lean gas obtained from said carbonization of the brown-coal briquettes, with the gas recirculated in the circuits of the preheating, dehydrating or drying, and carbonizing stages being heated and the gas recirculated in the circuit of the cooling stage being cooled, the improvement comprising providing, for each of the preheating stage and the dehydrating or drying stage and the carbonization stage, a respective primary gas recirculation circuit which is separate from each other primary gas recirculating circuit and closed except for a respective connection to a source of said lean gas; and separately heating the gas in each of said respective primary gas recirculation circuits of the preheating stage and the dehydrating or drying stage and the carbonization stage.
Claim 3
Dependent Claim
32 words
In a method of producing non-abrasive coke forms, as claimed in claim 1, the further improvement comprising providing said cooling stage with a respective primary gas recirculating circuit which is completely closed.
Claim 4
Dependent Claim
46 words
In a method of producing non-abrasive coke forms, as claimed in claim 2, including the further improvement comprising, in the carbonization stage, supplementing the hot gas in the respective gas recirculation circuit with cooled lean gas from the carbonization stage before recycling into the carbonization stage.
Claim 5
Dependent Claim
40 words
In a method of producing non-abrasive coke forms, as claimed in claim 2, including the further improvement comprising heating and at least partly producing the hot gases recirculating in the preheating, dehydrating and carbonization stages in respective separate combustion chambers.
Claim 6
Dependent Claim
49 words
In a method of producing non-abrasive coke forms, as claimed in claim 4, the further improvement comprising including the step of dedusting the hot gases of each stage separately in respective dust settling chambers while reducing their flow velocity to approximately 0.2 to 2.0 m/sec., and collecting the dust.
Claim 7
Dependent Claim
148 words
In a method of producing non-abrasive coke forms, as claimed in claim 4, including the further improvement comprising effecting the preheating up to a temperature of 120° C. to 150° C. while using 1.5 to 2.5 Nm 3 /h of hot gas per 1 kg of charged brown-coal briquettes; effecting the dehydration at 210° C. to 250° C. while using 5 to 6 Nm 3 /h of hot gas per 1 kg of charged brown-coal briquettes; effecting the carbonization at 800° C. to 900° C. while using 1.5 to 2.5 Nm 3 /h of hot gas per 1 kg of charged brown-coal briquettes; heating the hot gases in respective combustion chambers up to a temperature of 1000° C. to 1400° C.; and supplementing the hot gases of the carbonization stage with lean gas of the carbonization stage cooled down to a temperature of 25° C. to 35° C.
Claim 8
Dependent Claim
29 words
In a method of producing non-abrasive coke forms, as claimed in claim 4, including the further improvement comprising adding steam to the recirculating hot gas of the preheating stage.
Claim 9
Dependent Claim
29 words
In a method of producing non-abrasive coke forms, as claimed in claim 4, including the further improvement comprising adding steam to the recirculating hot gas of the drying stage.
Claim 10
Dependent Claim
35 words
In a method of producing non-abrasive coke forms, as claimed in claim 4, including the further improvement comprising maintaining the pressure in the primary gas recirculating circuits at a value slightly higher than atmospheric pressure.