CIEŚLAK MARIAN (PL)
SKRZYPCZAK GRZEGORZ (PL)
| WO1986000390A1 | 1986-01-16 |
| PL214569B1 | 2013-08-30 | |||
| PL214569B1 | 2013-08-30 |
| Claims 1. A method of drying fibrous biomass formed into ballots, consisting in pumping a drying medium in the form of flue gases, is characterised in that the raw flue gases are pumped through a ballot, while the flue gases are supplied to a ballot through a pipe{13) with a large diameter that exceeds 300 mm and the dried-up ballot is passed directly over to a combustion chamber. 2. A method according to claim 1, is characterised in that the drying process is realized in an enclosed chamber(3), located by a boiler(16) for burning straw. 3. A method according to claim 1 , is characterised in that the ballots to be dried are transported along the direction perpendicular to the direction of feeding ballots into the boiler(16). 4. A device for drying fibrous biomass formed into ballots that consists of a chamber that contains a flue gas inlet, is characterised in that the flue gas inlet ends with a pipe(13) of large diameter that exceeds 300 mm and the pipe is fitted with a movable end part(14), while there is a ballot feeding screw(5) in the chamber(3) and it is equipped with a pushing frame(11 ) that encloses the end part(14) of the pipe(13) that supplies flue gases. 5. A device according to claim 4, is characterised in that the end part(14) of the flue-gas-feeding pipe(13) has got a flange located near the back end and it is joined to the flue-gas-feeding pipe with a spring(15). |
The object of the invention is a method of drying fibrous biomass in ballots and a device for realizing the process according to this method, while the ballots are designed to be bunt in a boiler.
A method of drying fibrous biomass in ballots and a device for realizing the process according to this method are described in the description of the invention patented under No. PL 214569. According to this invention, the method of drying fibrous biomass formed into ballots consists in forcing a drying medium in the form of dedusted flue gases through the biomass. A ballot is stuck onto at least one hollowed out rod with a cone and lateral openings or slits. Cleaned hot flue gases at the temperature of 50 to 160 °C are supplied to the rod and the flue gases are passed through the ballot. When the ballot is dried up, it is removed from the rod. Flue gases are passed through ballots, once they have been passed through a dust- collecting chamber or filters and compressed by means of a fan. Once passed through the dust-coilecting chamber or filters, flue gases are guided to flow around the chamber with the ballot and then, to the fan.
The device for drying fibrous biomass formed into ballots is characterised in that it has got at least one rod with a cone and lateral openings or slits and the rod is permanently fixed in a body and connected with a conduit to a source of hot flue gasses, while there is also a servomotor installed in the body and the slidable piston rod of the servo-motor is connected to a displaceable push rod, fitted with guide bars mounted in the body. The conduit connected to the source of flue gases is fitted with a dust- coilecting chamber with flue gas filters. The conduit connected to the source of flue gases is fitted with a fan.
A method of drying fibrous biomass formed into ballots, according to the invention, consisting in pumping a drying medium in the form of flue gases, is characterised in that the raw flue gases are pumped through a ballot, while the flue gases are supplied to a ballot through a pipe with a large diameter that exceeds 300 mm and the dried-up ballot is passed directly over to a combustion chamber. The drying process is realized in an enclosed chamber, located by a boiler for burning straw. Ballots to be dried are transported along the direction perpendicular to the direction of feeding ballots into the boiler.
A device for drying fibrous biomass formed into ballots that consists of a chamber that contains a flue gas inlet is characterised in that the flue gas inlet ends with a pipe of large diameter that exceeds 300 mm and the pipe is fitted with a movable end part, while there is a ballot feeder in the chamber and it is equipped with a pushing frame that encloses the end part of the pipe that supplies flue gases. The end part of the fiue-gas-feeding pipe has got a flange located near the back end and it is joined to the fiue-gas-feeding pipe with a spring.
A method of and a device for drying fibrous biomass formed into ballots allows hot flue gases to be used to dry biomass, while volatile particles of flue gases are simultaneously removed from the flue gases and re-incinerated, as they remain in the biomass subjected to drying. The use if this energy to dry the fuel allows the efficiency of the combustion process in the boiler to be significantly increased. The energy contained in the flue gases generated by incinerating 1 ton of straw suffices to remove about 300÷500 litres of water. It means the it is possible to reduce the degree of moistness of 1 ton of straw from the level of 40%, when straw is perceptibly damp, to the level of about 20% that is the optimum level for batch-charged boilers. The device has also got the function of a flue-gas filter. The passage of flue gases through a high-density fibrous structure results in total removal of volatile particles from the gases. Moreover, sulphur compounds are also picked up from the flue gases, which reduces the level of their emission. The device is an automated line that requires only ballots to be loaded manually onto the feeder.
The method and the device are explained in more detail in the embodiment and in the drawings, where fig. 1 shows the top view of the device, fig. 2 shows the interior of the chamber for drying straw ballots, while fig. 3 is a side view of the feeder located inside the chamber for drying straw ballots.
As shown in fig. 1 - fig. 3, the device has got a chain feeder 1 on which straw ballots are placed in order to be dried and then to be incinerated. The chain feeder 1 is driven with a motor 2, located by the end of the feeder 1. The other end of the chain feeder 1 enters into a drying chamber 3, while the chamber 3 is closed on this side with a partition 4. A ballot is fed with the chain feeder 1 and, when it enters the chamber 3, it is located on a feeding screw 5, presented in fig. 3. The feeding screw 5 has got two tubular guide bars 6 and there is a driving screw 7 between them which is driven with the motor 8 over a chain transmission 9. A pusher 10 is located on the guide bars 6 and it has got a frame 11 in its top part. A flue 12 that supplies flue gases is fixed to the wall of the chamber 3. A large-diameter pipe 13, on which a movable end part 14 connected to the pipe 3 with a spring 15 is mounted, is fixed to the flue 12. The movable end part 14 has got a flange against which the frame 11 rests when it is moved into the back position. Once a ballot is placed on the feeding screw 5, the pusher 10 is moved a small distance forward, so that the spring 15 shifts the end part 14 towards the ballot. The end part 14 cuts into the ballot, so that flue gases are channelled into the ballot. As a result, flue gases from the flue 12 flow through the pipe 13 and the movable end part 14 and penetrate into the ballot, where they leave the majority of pollutants. After a preset time, the motor 8 is switched on and it turns the driving screw 7, which results in shifting the pusher 10 forward. The pusher 10 moves a dried-up ballot into the combustion chamber of a boiler 16, located by the chamber 3. The chamber 3 is closed with the partition 17 on the side of the boiler 16. At the moment the ballot is being shifted, the partition 17 is being lifted up.