Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
68 words
Method of improving the conveying properties of a particulate fuel in a fluidized bed combustion plant, preferably a PFBC plant, operating with a calcium-containing, particulate bed material, characterized in that at'least partially calcined bed material (CaO-containing bed material) is discharged from the combustion chamber (2), crushed and mixed with a particulate fuel and supplied to the combustion chamber together with the fuel via a pneumatic conveying system (24).
Claim 2
Dependent Claim
68 words
Method of improving the conveying properties of a particulate fuel in a fluidized bed combustion plant, preferably a PFBC plant, operating with a calcium-containing, particulate bed material, characterized in that at'least partially calcined bed material (CaO-containing bed material) is discharged from the combustion chamber (2), crushed and mixed with a particulate fuel and supplied to the combustion chamber together with the fuel via a pneumatic conveying system (24).
Claim 3
Dependent Claim
24 words
Method according to claim 1, characterized in that the bed material when being discharged passes through a zone with a low CO 2 content.
Claim 4
Dependent Claim
23 words
Method according to claim 2, characterized in that the temperature in said zone with a low C02 content is between 700°C and 800°C.
Claim 5
Dependent Claim
38 words
Method according to any of the preceding claims, cha-racterized in that the discharge device (17) for bed material includes means (18) for feeding combustion air into the discharge device (17) for cooling the bed material during its withdrawal.
Claim 6
Dependent Claim
25 words
Method according to any of the preceding claims, cha-racterized in that crushed fuel is mixed with finely crushed bed material in a rotary mixer (45).
Claim 7
Dependent Claim
28 words
Method according to any of claim 1 to 4, charac-terized in that bed material and fuel are first mixed and then ground together in a common mill (63).
Claim 8
Dependent Claim
29 words
Method according to any of the preceding claims, cha-racterized in that at least 90 % of the crushed bed material has a grain size of less than 100 ¡um.
Claim 9
Dependent Claim
23 words
8 . Method according to any of claim 5 to 7, charac-terized in that drying gas is supplied to the mixing device (45).
Claim 10
Dependent Claim
31 words
Method according to claim 8, characterized in that exhaust gas from the combustion plant and/or transport gas from an ash discharge system (106) in the plant are utilized as drying gas.
Claim 11
Dependent Claim
96 words
Combustion plant for carrying out the method according to any of the preceding claims with combustion of a particulate fuel in a fluidized bed combustion chamber (2), preferably a PFBC plant, with a bed material containing a particulate calcium-containing material, characterized in that it comprises a discharge device (17) for discharging at least partially calcined bed material (CaO-containing bed material) from the combustion chamber (2), a mill (43, 63) for crushing the discharged bed material, and a pneumatic conveying device (24, 25) for feeding the mixture of fuel and crushed bed material into the fluidized bed.
Claim 12
Dependent Claim
23 words
Combustion plant according to claim 10, charac-terized in that it includes means (53, 55) for supplying drying gas to the mixing device (45).
Claim 13
Dependent Claim
26 words
Combustion plant according to claim 10 or 11, cha-racterized in that it includes a device (45) for mixing crushed fuel and crushed bed material (Figure 1).
Claim 14
Dependent Claim
40 words
Combustion plant according to claim 10 or 11, cha-racterized in that it includes a device (45) for mixing uncrushed fuel and uncrushed bed material and a crushing device (63) for crushing the mixture of fuel and bed material (Figure 2).
Claim 15
Dependent Claim
32 words
Combustion plant according to any of claim 10 to 13, characterized in that the drying device includes an inclined, rotary cylinder (45) which is supplied with fuel, bed material and drying gas.