IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0556870
(1983-12-01)
|
우선권정보 |
FR-0020546 (1982-12-08) |
발명자
/ 주소 |
- Morin, Jean-Xavier
- Chrysostome, Gerard
|
출원인 / 주소 |
|
대리인 / 주소 |
Pollock, Vande Sande & Priddy
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
4 |
초록
▼
Process and apparatus for supplying combustible material to a fluidized bed in a vessel connected to a separating device for the solid particles entrained with the smoke and containing a certain proportion of unburnt matter, the particles recovered being recycled into the fluidized bed. During a nor
Process and apparatus for supplying combustible material to a fluidized bed in a vessel connected to a separating device for the solid particles entrained with the smoke and containing a certain proportion of unburnt matter, the particles recovered being recycled into the fluidized bed. During a normal operation of the fluidized bed supplied with combustible matter, the solid particles recovered in the separating device are accumulated in a silo and periodically, the supply of combustible matter is stopped and the particles accumulated in the silo are recycled into the fluidized bed with a regulated flow rate, so that the combustion of the unburnt matter contained in the recycled particles maintains the temperature of the fluidized bed at the desired level. The exothermic reaction is maintained alternately by the combustion of the combustible matter in the normal operating phase and by the combustion of the unburnt matter in the recycling phase. The invention is specially useful in boilers supplied with powdered coal.
대표청구항
▼
1. Process for supplying with combustible material a fluidized bed combustion installation comprising a vessel (1) having therein a fluidized bed for the combustion of a combustible material producing smoke, conduit means (17) for evacuating said smoke carrying along solid particles containing unbur
1. Process for supplying with combustible material a fluidized bed combustion installation comprising a vessel (1) having therein a fluidized bed for the combustion of a combustible material producing smoke, conduit means (17) for evacuating said smoke carrying along solid particles containing unburned matter, a device (3) for separating out said solid particles carried along by said smoke, and a circuit (41) for recycling to said fluidized bed said solid particles recovered in said separating device, said process comprising two alternating phases for supplying said fluidized bed with combustible material, viz., (1) a first phase of normal operation in which said fluidized bed is supplied with combustible material at an adjustable flow rate by supply means (21) so as to produce a predetermined temperature in said fluidized bed, and during which said solid particles recovered in said separating device (3) are accumulated in a reverse silo (4), said recycling circuit being closed, and (2) a second periodic recycling phase during which supply from said supply means (21) is halted and said recycling circuit (41) is opened, in order to recycle to said fluidized bed said solid particles accumulated in said reserve silo (4) during said first phase, recycling being so regulated that the combustion of said unburnt matter contained in said solid particles maintains the temperature of said fluidized bed at a desired level, said recycling circuit (41) being closed as soon as said temperature can no longer be maintained at said level, the accumulated particles being removed during a period sufficiently small not to cause a drop in temperature of said fluidized bed below a predetermined limit, whereupon normal first phase operation resumes; (3) an exothermic reaction being maintained alternatively by combustion of said combustible material in said first phase and by combustion of said unburnt matter in said second phase. 2. Process according to claim 1, wherein said solid particles entrained said smoke during said second phase are accumulated in an intermediate silo interposed between said separating device and said reserve silo. 3. Process according to claim 1, wherein the temperature of said fluidized bed is measured permanently and recycling of said solid particles is servo-coupled to the temperature of said fluidized bed so as to maintain said temperature at the same level as during said first phase. 4. Process according to claim 3, wherein detection of a drop in temperature below said desired level determines the stopping of said second phase and resumption of said first phase. 5. Process according to claim 4, wherein the flow rate of recycling said solid particles is measured continuously, said second phase being terminated and return to said first phase being actuated when said flow rate necessary for the maintainence of said desired temperature level exceeds a predetermined limit. 6. Process for supplying with combustible material a fluidized bed combustion installation comprising a vessel (1) having therein a fluidized bed for the combustion of a combustible material producing smoke, conduit means (17) for evacuating said smoke carrying along solid particles containing unburned matter, a device (3) for separating out said solid particles carried along by said smoke, and a circuit (41) for recycling to said fluidized bed said solid particles recovered in said separating device, said process comprising two alternating phase for supplying said fluidized bed with combustible material, viz., (1) a first phase of normal operation in which said fluidized bed is supplied with combustible material at an adjustable flow rate by supply means (21) so as to produce a predetermined temperature in said fluidized bed, and during which said solid particles recovered in said separating device (3) are accumulated in a reserve silo (4), said recycling circuit being closed, and (2) a second periodic recycling phase during which supply from said supply means (21) is halted and said recycling circuit (41) is opened, in order to recycle to said fluidized bed said solid particles accumulated in said reserve silo (4) during said first phase, recycling being so regulated that the combustion of said unburnt matter contained in said solid particles maintains the temperature of said fluidized bed at a desired level, said recycling circuit (41) being closed as soon as said temperature can no longer be maintained at said level, the return to normal supply of said fluidized bed with combustible matter and the rapid removal of accumulated particles being actuated simultaneously at the end of said second phase, said rapid removal being stopped before the complete emptying of said silo when the level of the particles in the latter reaches a predetermined limit, whereupon normal first phase operation resumes; (3) an exothermic reaction being maintained alternatively by combustion of said combustible material in said first phase and by combustion of said unburnt matter in said second phase. 7. Process for supplying with combustible material a fluidized bed combustion installation comprising a vessel (1) having therein a fluidized bed for the combustion of a combustible material producing smoke, conduit means (17) for evacuating said smoke carrying along solid particles containing unburned matter, a device (3) for separating out said solid particles carried along by said smoke, and a circuit (41) for recycling to said fluidized bed said solid particles recovered in said separating device, said process comprising two alternating phases for supplying said fluidized bed with combustible material, viz., (1) a first phase of normal operation in which said fluidized bed is supplied with combustible material at an adjustable flow rate by supply means (21) so as to produce a predetermined temperature in said fluidized bed, and during which said solid particles recovered in said separating device (3) are accumulated in a reserve silo (4), said recycling circuit being closed, and (2) a second periodic recycling phase during which supply from said supply means (21) is halted and said recycling circuit (41) is opened, in order to recycle to said fluidized bed said solid particles accumulated in said reserve silo (4) during said first phase, recycling being so regulated that the combustion of said unburnt matter contained in said solid particles maintains the temperature of said fluidized bed at a desired level, said recycling circuit (41) being closed as soon as said temperature can no longer be maintained at said level, whereupon normal first phase operation resumes; (3) an exothermic reaction being maintained alternatively by combustion of said combustible material in said first phase and by combustion of said unburnt matter in said second phase; wherein said fluidized bed operates at a pressure higher than atmospheric pressure and is supplied with combustible matter occurring at the same pressure through a lock device, said supply proceeding from a single chamber forming a lock comprising an inlet and an outlet for material, each provided with an isolating valve respectively and pressurizing means and depressurizing means for said supply chamber, previously filled with fuel material, being alternately placed at the pressure of said combustion vessel during said second phase to be placed at atmospheric pressure and filled again with combustible matter.
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