CN110056866A - Fluidized bed second level whirlwind feeding back device and whirlwind feed back control method - Google Patents
Fluidized bed second level whirlwind feeding back device and whirlwind feed back control method Download PDFInfo
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- CN110056866A CN110056866A CN201810337020.6A CN201810337020A CN110056866A CN 110056866 A CN110056866 A CN 110056866A CN 201810337020 A CN201810337020 A CN 201810337020A CN 110056866 A CN110056866 A CN 110056866A
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- return pipe
- material return
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000011343 solid material Substances 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 184
- 238000010926 purge Methods 0.000 claims description 31
- 238000005243 fluidization Methods 0.000 claims description 17
- 238000009825 accumulation Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000000643 oven drying Methods 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 7
- 239000007787 solid Substances 0.000 abstract description 7
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 230000001360 synchronised effect Effects 0.000 abstract description 4
- 235000021050 feed intake Nutrition 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 70
- 238000005299 abrasion Methods 0.000 description 2
- 238000012840 feeding operation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/28—Control devices specially adapted for fluidised bed, combustion apparatus
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses a kind of fluidized bed second level whirlwind feeding back device and whirlwind feed back control methods, fluidized bed second level whirlwind feeding back device includes feeding back device, primary cyclone and secondary cyclone, fluidized bed second level whirlwind feed back control method includes the following steps: (1) baker, (2) fluidized bed starts to feed intake to form solid material envelope, (3) whirlwind feed back.The advantage of the invention is that, during the heating of fluidized bed baker, after opened butterfly valve, hot gas can rapidly enter primary cyclone and secondary cyclone, it realizes the heating synchronous with fluidized bed of primary cyclone, secondary cyclone, avoids fluidized bed and feed intake after operation inside the first dipleg and the second dipleg the acutely caused coating shedding of heating；Butterfly valve and right angle pipeline are used cooperatively, using the angle of repose of solid particle, the rate of wear of butterfly valve is reduced, extends the service life of butterfly valve.
Description
The technical field is as follows:
the invention relates to the technical field of gasification, in particular to a fluidized bed secondary cyclone material returning device and a cyclone material returning control method.
Background art:
the cyclone material returning system comprises a cyclone separator and a material returning device, wherein the cyclone separator separates materials in the crude gas, and the materials are returned to the fluidized bed through the material returning device. The feeding back device is mainly used for feeding hot gas in the fluidized bed into the cyclone separator through the feeding back device during the temperature rise of the fluidized bed, so that the cyclone separator and the fluidized bed can be synchronously heated; and after the fluidized bed begins to feed, the cyclone separator catches materials, and the materials can return to the fluidized bed through the dipleg and the material returning device and prevent the flue gas from being back-mixed.
The material returning device comprises a material feeding pipe, a material returning valve and a material returning pipeline. The material returning valves used by the current circulating fluidized bed are mainly U valves and wing valves. The resistance of the U valve to gas flow is large, hot gas cannot enter the cyclone separator quickly during the temperature rising period of the fluidized bed drying furnace, so that the cyclone separator cannot realize synchronous temperature rising with the fluidized bed, after the fluidized bed is fed and operated, the dipleg of the cyclone separator is heated violently, the thermal stress of the internal coating is increased too fast, and the coating falls off. The wing valve is arranged in front of the gasifier, and needs to be opened and fixed through a fuse wire by entering the pipeline manually, so that the purpose that hot gas enters the feed back device and the dipleg to heat the device is achieved, and the operation is complex; after the feeding, the materials in the legs are all pressed on the valve plates of the wing valves, so that the working pressure of the valve plates is large, when the pressure of the materials reaches a certain value, the wing valves can be driven to open, and the materials are always in sliding contact with the valve plates, so that the valve plates are seriously abraded.
The invention content is as follows:
the first purpose of the invention is to provide a fluidized bed secondary cyclone material returning device which can fully separate crude gas from solid particles, ensure that a cyclone separator and a fluidized bed are synchronously heated during a furnace baking period and reduce the failure rate of the material returning device.
The second purpose of the invention is to provide a fluidized bed secondary cyclone material returning control method which ensures that the temperature of the cyclone separator and the fluidized bed is synchronously raised during the furnace baking period and reduces the failure rate of a material returning device.
The first purpose of the invention is realized by the following technical scheme: the fluidized bed secondary cyclone material returning device comprises a material returning device, a primary cyclone separator and a secondary cyclone separator, wherein the material returning device comprises a primary material returning device and a secondary material returning device;
the primary material return device comprises a first vertically arranged feeding pipe, the top end of the first feeding pipe is communicated with a first dipleg of the primary cyclone separator, the bottom end of the first feeding pipe is connected with a first horizontal material return pipe, and the first feeding pipe is communicated with the first horizontal material return pipe; an end socket is arranged at one end, close to the fluidized bed, of the first horizontal material return pipe, and a second horizontal material return pipe is connected to one end, far away from the fluidized bed, of the first horizontal material return pipe; a first loosening air inlet is formed in the side wall of the first horizontal material return pipe and is opposite to the bottom end of the first material inlet pipe, a first loosening air pipeline is connected to the first loosening air inlet, and a first loosening valve is arranged on the first loosening air pipeline; a discharge port is formed in the horizontal material return pipe between the first loose gas inlet and the seal head, and a butterfly valve is arranged on the first horizontal material return pipe between the discharge port and the first loose gas inlet; the discharge port is connected with an inclined material return pipe through a pipeline, and the lower end of the inclined material return pipe is communicated with a material return port of the fluidized bed;
the secondary material return device comprises a second feeding pipe which is vertically arranged, the top end of the second feeding pipe is communicated with a second dipleg of the secondary cyclone separator, the bottom end of the second feeding pipe is connected with a second horizontal material return pipe, one end, far away from the first horizontal material return pipe, of the second horizontal material return pipe is provided with a fluidized gas inlet, the fluidized gas inlet is connected with a fluidized gas pipeline, and a fluidized valve is arranged on the fluidized gas pipeline; the lateral wall of the second horizontal material return pipe is provided with a second loose gas inlet, the second loose gas inlet is arranged opposite to the bottom end of the second feeding pipe, a second loose gas pipeline is connected to the second loose gas inlet, and a second loose valve is arranged on the second loose gas pipeline.
Further, the butterfly valve comprises a valve plate, a non-circular through hole is formed in the valve plate along the central line direction, a valve rod is inserted into the non-circular through hole, and the valve rod is matched with the non-circular through hole; the side wall of the first horizontal material return pipe is provided with a valve rod groove, the bottom end of the valve rod penetrates through the non-circular through hole and is inserted into the valve rod groove, and the top end of the valve rod penetrates through the non-circular through hole and the side wall of the first horizontal material return pipe in sequence and is arranged outside the first horizontal material return pipe.
Furthermore, the first horizontal material return pipe and the seal head are detachably connected.
Furthermore, the upper end of the inclined material return pipe is provided with a purge gas inlet, the purge gas inlet is connected with a purge gas pipeline, and the purge gas pipeline is provided with a purge valve.
Further, a first pressure gauge is arranged at the upper part of the first dipleg, and a second pressure gauge is arranged at the lower part of the first dipleg; a third pressure gauge is arranged at the upper part of the second dipleg, and a fourth pressure gauge is arranged at the lower part of the second dipleg; and a fifth pressure gauge is arranged at the lower part of the fluidized bed, the fifth pressure gauge and the material returning port are positioned at the same height, and a sixth pressure gauge is arranged at an air outlet of the fluidized bed.
The second purpose of the invention is realized by the following technical scheme: the fluidized bed secondary cyclone feed back control method comprises the following steps: (1) baking a furnace, (2) starting feeding of a fluidized bed to form solid material seal, and (3) cyclone material return; wherein,
(1) baking: opening a butterfly valve, closing a fluidization valve, a first loose valve, a second loose valve and a purge valve, starting a fluidized bed, raising the temperature, leading out a part of hot gas in the fluidized bed from a material return port of the fluidized bed, sequentially entering an inclined material return pipe, a first horizontal material return pipe, a first feeding pipe, a first dipleg, the main body of a primary cyclone separator, the main body of a second horizontal material return pipe, a second feeding pipe, a second dipleg and a secondary cyclone separator, discharging the other part of the hot gas from a fluidized bed gas outlet at the top of the fluidized bed, entering the main body of the primary cyclone separator and the main body of the secondary cyclone separator, and finally leading out the hot gas from a cyclone gas outlet of the secondary cyclone separator to enter a rear system to finish the oven drying;
(2) the fluidized bed starts to feed to form a solid material seal: after the oven is dried, the butterfly valve is closed, the fluidized bed starts to feed, crude gas is discharged from the gas outlet of the fluidized bed and enters the main body of the primary cyclone separator, the primary cyclone separator collects the materials, and the collected materials are gathered in the first dipleg, the first feeding pipe and the first horizontal material return pipe; the raw gas after the primary separation with the materials is led out from the gas outlet of the primary cyclone separator and enters the secondary cyclone separator, the secondary cyclone separator further traps the materials, and the trapped materials are gathered in the second dipleg, the second feeding pipe and the second horizontal material return pipe; in the operation process of the system, each pressure gauge detects the pressure value of the corresponding part in real time, wherein the measured value of the first pressure gauge is P1, the measured value of the second pressure gauge is P2, the measured value of the third pressure gauge is P3, the measured value of the fourth pressure gauge is P4, the measured value of the fifth pressure gauge is P5, the measured value of the sixth pressure gauge is P6, when the pressure value is (P5-P1) > (P5-P6), the butterfly valve is opened, the material is in a stagnation state, and a solid material seal is formed;
(3) material returning:
fluidizing and feeding back: after (P5-P1) - (P5-P6) > a and (P5-P3) - (P5-P6) > a, opening the first and second loosening valves to loosen the material accumulated in the first and second legs; after the materials are loosened, the first loosening valve and the second loosening valve are closed, the fluidizing valve is opened, the materials are blown by fluidizing gas to move to the discharge port, enter the inclined material returning pipe through the discharge port and finally return to the fluidized bed, wherein a is 10-30 kPa;
(II) stockleg material accumulation: and (3) as the feed back process is carried out, fluctuating the pressure difference of the first dipleg (P2-P1) and the pressure difference of the second dipleg (P4-P3) within 0-30KPa respectively, closing the fluidization valve when (P5-P1) ═ P5-P6 or (P5-P3) ═ P5-P6), continuing to accumulate the materials in the first dipleg and the second dipleg, and repeating the operation of the step (one) after (P5-P1) - (P5-P6) > a and (P5-P3) - (P5-P6) > a, thus circularly completing the feed back.
Further, when the pressure difference (P2-P1) of the first dipleg and the pressure difference (P4-P3) of the second dipleg are not fluctuated and are increased all the time during the material returning, the fluidization valve is adjusted to be large and the purge valve is opened, and the conveying pressure is increased to ensure that the material returning is normal.
Further, after the fluidization valve is adjusted to be large and the purge valve is opened, if the pressure difference (P2-P1) of the first dipleg is not fluctuated and is increased all the time, the fluidization valve is closed, the first loosening valve is opened, and the material in the first dipleg is loosened;
after the fluidization valve is adjusted to be large and the purge valve is opened, if the pressure difference (P4-P3) of the second dipleg is not fluctuated and is increased all the time, the fluidization valve is closed, the second loosening valve is opened, and the material in the second dipleg is loosened.
Further, the butterfly valve comprises a valve plate, a non-circular through hole is formed in the valve plate along the central line direction, a valve rod is inserted into the non-circular through hole, and the valve rod is matched with the non-circular through hole; the side wall of the first horizontal material return pipe is provided with a valve rod groove, the bottom end of the valve rod penetrates through the non-circular through hole and is inserted into the valve rod groove, and the top end of the valve rod penetrates through the non-circular through hole and the side wall of the first horizontal material return pipe in sequence and is arranged outside the first horizontal material return pipe.
The invention has the advantages that: 1. during the temperature rise of the fluidized bed oven, after the butterfly valve is opened, hot gas can rapidly enter the primary cyclone separator and the secondary cyclone separator, so that the synchronous temperature rise of the primary cyclone separator, the secondary cyclone separator and the fluidized bed is realized, and the falling of a coating caused by the severe temperature rise in the first dipleg and the second dipleg after the feeding operation of the fluidized bed is avoided; 2. the butterfly valve is matched with the right-angle pipeline for use, and the butterfly valve stops moving into the first horizontal feed back pipe after the accumulation angle of the solid particles in the first feed pipe reaches the repose angle by utilizing the repose angle of the solid particles; after the accumulation angle of the solid particles in the second feeding pipe reaches the repose angle, the solid particles stop moving into the second horizontal feeding pipe, so that the working pressure of the butterfly valve is reduced, the abrasion speed of the butterfly valve is reduced, and the service life of the butterfly valve is prolonged; 3. the butterfly valve is only composed of a valve plate and a valve rod, the structure is simple, a detachable seal head is arranged at one end, close to the butterfly valve, of the first horizontal material return pipe, and the valve plate is easy to replace after being damaged; 4. the upper end of the inclined material return pipe is provided with a purge gas inlet, and the purge gas can provide certain power for the furnace return material in the inclined material return pipe so that the furnace return material can smoothly enter the fluidized bed; 5. the primary cyclone separator and the secondary cyclone separator are matched, so that the crude gas and the solid particles can be more thoroughly separated.
Description of the drawings:
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural diagram of a valve plate of the butterfly valve.
A primary cyclone separator 1, a secondary cyclone separator 2, a first feeding pipe 3, a first dipleg 1-1, a first pressure gauge 4, a second pressure gauge 5, a fluidized bed 6, a first horizontal return pipe 7, a fluidized bed air outlet 8, a seal head 9, a second horizontal return pipe 10, a first loose gas inlet 7-1, a first loose valve 7-2, a discharge port 7-3, a butterfly valve 11, an inclined return pipe 12, a second feeding pipe 13, a second dipleg 2-1, a third pressure gauge 14, a fourth pressure gauge 15, a fluidized gas inlet 10-1, a fluidized valve 10-2, a second loose gas inlet 10-3, a second loose valve 10-4, a valve plate 11-1, a non-circular through hole 11-2, a valve rod 11-3, a valve rod groove 7-4, a purge gas inlet 12-1 and a purge valve 12-2, a fifth pressure gauge 16, a sixth pressure gauge 17 and a material returning port 18.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1-2, the fluidized bed secondary cyclone feed back device comprises a feed back device, a primary cyclone separator 1 and a secondary cyclone separator 2, wherein the feed back device comprises a primary feed back device and a secondary feed back device;
the primary material returning device comprises a first material feeding pipe 3 which is vertically arranged, the top end of the first material feeding pipe 3 is communicated with a first dipleg 1-1 of the primary cyclone separator 1, a first pressure gauge 4 is arranged at the upper part of the first dipleg 1-1, and a second pressure gauge 5 is arranged at the lower part of the first dipleg 1-1; the bottom end of the first feeding pipe 3 is connected with a first horizontal feed back pipe 7, and the first feeding pipe 3 is communicated with the first horizontal feed back pipe 7; one end of the first horizontal feed back pipe 7, which is close to the fluidized bed 6, is connected with an end enclosure 9 through a flange, and one end of the first horizontal feed back pipe 7, which is far away from the fluidized bed 6, is connected with a second horizontal feed back pipe 10; a first loose gas inlet 7-1 is formed in the side wall of the first horizontal material return pipe 7, the first loose gas inlet 7-1 is arranged opposite to the bottom end of the first material inlet pipe 3, a first loose gas pipeline is connected to the first loose gas inlet 7-1, and a first loose valve 7-2 is arranged on the first loose gas pipeline; a discharge port 7-3 is arranged on the horizontal feed back pipe between the first loose gas inlet 7-1 and the seal head 9, and a butterfly valve 11 is arranged on the first horizontal feed back pipe 7 between the discharge port 7-3 and the first loose gas inlet 7-1; the discharge port 7-3 is connected with an inclined feed back pipe 12 through a pipeline, the upper end of the inclined feed back pipe 12 is provided with a purge gas inlet 12-1, the purge gas inlet 12-1 is connected with a purge gas pipeline, the purge gas pipeline is provided with a purge valve 12-2, and the lower end of the inclined feed back pipe 12 is communicated with a feed back port 18 of the fluidized bed 6; the lower part of the fluidized bed 6 is provided with a fifth pressure gauge 16, the fifth pressure gauge 16 and the material returning port 18 are positioned at the same height, and a sixth pressure gauge 17 is arranged at the fluidized bed air outlet 8 of the fluidized bed 6.
The secondary material return device comprises a second material inlet pipe 13 which is vertically arranged, the top end of the second material inlet pipe 13 is communicated with a second dipleg 2-1 of the secondary cyclone separator 2, the upper part of the second dipleg 2-1 is provided with a third pressure gauge 14, the lower part of the second dipleg 2-1 is provided with a fourth pressure gauge 15, the bottom end of the second material inlet pipe 13 is connected with a second horizontal material return pipe 10, one end of the second horizontal material return pipe 10, which is far away from the first horizontal material return pipe 7, is provided with a fluidizing gas inlet 10-1, the fluidizing gas inlet 10-1 is connected with a fluidizing gas pipeline, and the fluidizing gas pipeline is provided with a fluidizing valve 10-2; a second loose gas inlet 10-3 is formed in the side wall of the second horizontal material return pipe 10, the second loose gas inlet 10-3 is arranged opposite to the bottom end of the second material inlet pipe 13, a second loose gas pipeline is connected to the second loose gas inlet 10-3, and a second loose valve 10-4 is arranged on the second loose gas pipeline;
the butterfly valve 11 comprises a valve plate 11-1, a non-circular through hole 11-2 is formed in the valve plate 11-1 along the central line direction, a valve rod 11-3 is inserted into the non-circular through hole 11-2, and the valve rod 11-3 is matched with the non-circular through hole 11-2; the side wall of the first horizontal feed back pipe 7 is provided with a valve rod groove 7-4, the bottom end of the valve rod 11-3 penetrates through the non-circular through hole 11-2 and is inserted into the valve rod groove 7-4, and the top end of the valve rod 11-3 sequentially penetrates through the non-circular through hole 11-2 and the side wall of the first horizontal feed back pipe 7 and is arranged outside the first horizontal feed back pipe 7. The butterfly valve 11 is simple in structure, after the butterfly valve is damaged, the end socket 9 at the end part of the first horizontal material return pipe 7 can be opened, the butterfly valve 11 is replaced, and operation is convenient.
Example 2:
the method for controlling the secondary cyclone return of the fluidized bed by using the secondary cyclone return device of the fluidized bed in the embodiment 1 comprises the following steps: (1) baking a furnace, (2) starting feeding of a fluidized bed to form solid material seal, and (3) cyclone material return; wherein,
(1) baking: opening a butterfly valve 11, closing a fluidized valve 10-2, a first loose valve 7-2, a second loose valve 10-4 and a purge valve 12-2, starting the fluidized bed 6, heating, leading out a part of hot gas in the fluidized bed 6 from a material return port 18 of the fluidized bed 6, sequentially entering an inclined material return pipe 12, a first horizontal material return pipe 7, a first material inlet pipe 3, a first dipleg 1-1, the interior of a main body of a primary cyclone separator 1, a second horizontal material return pipe 10, a second material inlet pipe 13, a second dipleg 2-1 and the interior of a main body of a secondary cyclone separator 2, discharging the other part of the hot gas from a fluidized bed gas outlet 8 at the top of the fluidized bed 6, entering the interior of the main body of the primary cyclone separator 1 and the interior of the main body of the secondary cyclone separator 2, and finally leading out the hot gas from a cyclone gas outlet of the secondary cyclone separator to enter a rear; synchronous temperature rise of the primary cyclone separator 1, the secondary cyclone separator 2 and the fluidized bed 6 is realized, and coating falling caused by severe temperature rise in the first dipleg 1-1 and the second dipleg 2-1 after the feeding operation of the fluidized bed 6 is avoided;
(2) the fluidized bed starts to feed to form a solid material seal: after the oven is dried, the butterfly valve 11 is closed, the fluidized bed 6 starts to feed, the crude gas is discharged from the gas outlet 8 of the fluidized bed and enters the main body of the primary cyclone separator 1, the primary cyclone separator 1 collects the materials, and the collected materials are gathered in the first dipleg 1-1, the first feeding pipe 3 and the first horizontal material return pipe 7; the crude gas after the primary separation with the materials is led out from the gas outlet of the primary cyclone separator 1 and enters the secondary cyclone separator 2, the secondary cyclone separator 2 further traps the materials, and the trapped materials are gathered in the second dipleg 2-1, the second feeding pipe 13 and the second horizontal material return pipe 10; in the operation process of the system, each pressure gauge detects the pressure value of the corresponding part in real time, wherein the measured value of the first pressure gauge 4 is P1, the measured value of the second pressure gauge 5 is P2, the measured value of the third pressure gauge 14 is P3, the measured value of the fourth pressure gauge 15 is P4, the measured value of the fifth pressure gauge 16 is P5, the measured value of the sixth pressure gauge 17 is P6, when the pressure is (P5-P1) > (P5-P6), the butterfly valve 11 is opened, the material is in a stagnation state, a solid material seal is formed, the working pressure of the butterfly valve 11 is reduced, the abrasion speed of the butterfly valve 11 is reduced, and the service life of the butterfly valve 11 is prolonged; meanwhile, the gas in the fluidized bed 6 is prevented from reversely entering the primary cyclone separator 1 and the secondary cyclone separator 2 through the first horizontal feed back pipe 7 and the second horizontal feed back pipe 10, and the primary cyclone separator 1 and the secondary cyclone separator 2 can normally work
(3) Material returning:
fluidizing and feeding back: when the pressure is higher than the pressure (P5-P1) - (P5-P6) > a and the pressure is higher than the pressure (P5-P3) - (P5-P6) > a, the first release valve 7-2 and the second release valve 10-4 are opened, the materials piled in the first material leg 1-1 and the second material leg 2-1 are loosened, the fluidizing valve 10-2 is opened after the first release valve 7-2 and the second release valve 10-4 are closed, the materials are blown by the fluidizing gas to move towards the material outlet 7-3, enter the inclined return pipe 12 through the material outlet 7-3 and finally return to the fluidized bed 6; wherein a is 10kPa-30kPa, the value of a is determined by the bed height of the fluidized bed 6, the higher the bed height is, the larger the value of a is, the maximum value of a is 30kPa, in the embodiment, a is 30kPa
(II) stockleg material accumulation: as the feed back process progresses, the pressure difference of the first dipleg 1-1 (P2-P1) and the pressure difference of the second dipleg 2-1 (P4-P3) fluctuate within 0-30KPa, respectively, when (P5-P1) ═ P5-P6 or (P5-P3) ═ P5-P6, the fluidizing valve 10-2 is closed, the materials in the first dipleg 1-1 and the second dipleg 2-1 continue to accumulate, when (P5-P1) - (P5-P6) > a and (P5-P3) - (P5-P6) > a, the operation of the step (a) is repeated, and the feed back is completed in such a cycle.
When the pressure difference (P2-P1) of the first dipleg 1-1 and the pressure difference (P4-P3) of the second dipleg 2-1 do not fluctuate and are increased all the time during the material returning, the fluidization valve 10-2 is adjusted to be large, the purge valve 12-2 is opened, and the conveying pressure is increased to ensure the normal material returning.
After the fluidization valve 10-2 is adjusted to be large and the purge valve 12-2 is opened, if the pressure difference (P2-P1) of the first dipleg 1-1 is not fluctuated and is increased all the time, the fluidization valve 10-2 is closed, the first loosening valve 7-2 is opened, and the material in the first dipleg 1-1 is loosened;
when the fluidizing valve 10-2 is adjusted to be large and the purge valve 12-2 is opened, if the pressure difference (P4-P3) of the second dipleg 2-1 is not fluctuated and is increased all the time, the fluidizing valve 10-2 is closed and the second loosening valve 10-4 is opened to loosen the material in the second dipleg 2-1.
The butterfly valve 11 is only composed of a valve plate 11-1 and a valve rod 11-3, the structure is simple, and a detachable seal head 9 is arranged at one end, close to the butterfly valve 11, of the first horizontal material return pipe 7, so that the valve plate 11-1 can be taken out conveniently; after the valve plate 11-1 is worn after long-term use, the valve rod 11-3 is drawn out from the non-circular through hole 11-2, the seal head 9 is opened, the damaged valve plate 11-1 is taken out and replaced, the seal head 9 is fixed, and then the replacement of the valve plate 11-1 is completed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The fluidized bed secondary cyclone material returning device is characterized by comprising a material returning device, a primary cyclone separator and a secondary cyclone separator, wherein the material returning device comprises a primary material returning device and a secondary material returning device;
the primary material return device comprises a first vertically arranged feeding pipe, the top end of the first feeding pipe is communicated with a first dipleg of the primary cyclone separator, the bottom end of the first feeding pipe is connected with a first horizontal material return pipe, and the first feeding pipe is communicated with the first horizontal material return pipe; an end socket is arranged at one end, close to the fluidized bed, of the first horizontal material return pipe, and a second horizontal material return pipe is connected to one end, far away from the fluidized bed, of the first horizontal material return pipe; a first loosening air inlet is formed in the side wall of the first horizontal material return pipe and is opposite to the bottom end of the first material inlet pipe, a first loosening air pipeline is connected to the first loosening air inlet, and a first loosening valve is arranged on the first loosening air pipeline; a discharge port is formed in the horizontal material return pipe between the first loose gas inlet and the seal head, and a butterfly valve is arranged on the first horizontal material return pipe between the discharge port and the first loose gas inlet; the discharge port is connected with an inclined material return pipe through a pipeline, and the lower end of the inclined material return pipe is communicated with a material return port of the fluidized bed;
the secondary material return device comprises a second feeding pipe which is vertically arranged, the top end of the second feeding pipe is communicated with a second dipleg of the secondary cyclone separator, the bottom end of the second feeding pipe is connected with a second horizontal material return pipe, one end, far away from the first horizontal material return pipe, of the second horizontal material return pipe is provided with a fluidized gas inlet, the fluidized gas inlet is connected with a fluidized gas pipeline, and a fluidized valve is arranged on the fluidized gas pipeline; the lateral wall of the second horizontal material return pipe is provided with a second loose gas inlet, the second loose gas inlet is arranged opposite to the bottom end of the second feeding pipe, a second loose gas pipeline is connected to the second loose gas inlet, and a second loose valve is arranged on the second loose gas pipeline.
2. The fluidized bed secondary cyclone feed back device as claimed in claim 1, wherein the butterfly valve comprises a valve plate, a non-circular through hole is arranged in the valve plate along the direction of the central line, a valve rod is inserted into the non-circular through hole, and the valve rod is matched with the non-circular through hole; the side wall of the first horizontal material return pipe is provided with a valve rod groove, the bottom end of the valve rod penetrates through the non-circular through hole and is inserted into the valve rod groove, and the top end of the valve rod penetrates through the non-circular through hole and the side wall of the first horizontal material return pipe in sequence and is arranged outside the first horizontal material return pipe.
3. The fluidized bed secondary cyclone return device according to claim 1 or 2, wherein the first horizontal return pipe is detachably connected with the seal head.
4. The fluidized bed secondary cyclone feed back device as claimed in claim 1 or 2, wherein a purge gas inlet is arranged at the upper end of the inclined feed back pipe, a purge gas pipeline is connected to the purge gas inlet, and a purge valve is arranged on the purge gas pipeline.
5. The fluidized bed cyclone material returning device as claimed in claim 1 or 2, wherein a first pressure gauge is provided at the upper part of the first dipleg, and a second pressure gauge is provided at the lower part of the first dipleg; a third pressure gauge is arranged at the upper part of the second dipleg, and a fourth pressure gauge is arranged at the lower part of the second dipleg; and a fifth pressure gauge is arranged at the lower part of the fluidized bed, the fifth pressure gauge and the material returning port are positioned at the same height, and a sixth pressure gauge is arranged at an air outlet of the fluidized bed.
6. The fluidized bed secondary cyclone feed back control method is characterized by comprising the following steps: (1) baking a furnace, (2) starting feeding of a fluidized bed to form solid material seal, and (3) cyclone material return; wherein,
(1) baking: opening a butterfly valve, closing a fluidization valve, a first loose valve, a second loose valve and a purge valve, starting a fluidized bed, raising the temperature, leading out a part of hot gas in the fluidized bed from a material return port of the fluidized bed, sequentially entering an inclined material return pipe, a first horizontal material return pipe, a first feeding pipe, a first dipleg, the main body of a primary cyclone separator, the main body of a second horizontal material return pipe, a second feeding pipe, a second dipleg and a secondary cyclone separator, discharging the other part of the hot gas from a fluidized bed gas outlet at the top of the fluidized bed, entering the main body of the primary cyclone separator and the main body of the secondary cyclone separator, and finally leading out the hot gas from a cyclone gas outlet of the secondary cyclone separator to enter a rear system to finish the oven drying;
(2) the fluidized bed starts to feed to form a solid material seal: after the oven is dried, the butterfly valve is closed, the fluidized bed starts to feed, crude gas is discharged from the gas outlet of the fluidized bed and enters the main body of the primary cyclone separator, the primary cyclone separator collects the materials, and the collected materials are gathered in the first dipleg, the first feeding pipe and the first horizontal material return pipe; the raw gas after the primary separation with the materials is led out from the gas outlet of the primary cyclone separator and enters the secondary cyclone separator, the secondary cyclone separator further traps the materials, and the trapped materials are gathered in the second dipleg, the second feeding pipe and the second horizontal material return pipe; in the operation process of the system, each pressure gauge detects the pressure value of the corresponding part in real time, wherein the measured value of the first pressure gauge is P1, the measured value of the second pressure gauge is P2, the measured value of the third pressure gauge is P3, the measured value of the fourth pressure gauge is P4, the measured value of the fifth pressure gauge is P5, the measured value of the sixth pressure gauge is P6, when the pressure value is (P5-P1) > (P5-P6), the butterfly valve is opened, the material is in a stagnation state, and a solid material seal is formed;
(3) material returning:
fluidizing and feeding back: after (P5-P1) - (P5-P6) > a and (P5-P3) - (P5-P6) > a, opening the first and second loosening valves to loosen the material accumulated in the first and second legs; after the materials are loosened, closing the first loosening valve and the second loosening valve, opening the fluidizing valve, blowing the materials to a discharge port by fluidizing gas, entering the inclined material return pipe through the discharge port, and finally returning to the fluidized bed, wherein a is 10-30 kPa;
(II) stockleg material accumulation: and (3) as the feed back process is carried out, fluctuating the pressure difference of the first dipleg (P2-P1) and the pressure difference of the second dipleg (P4-P3) within 0-30KPa respectively, closing the fluidization valve when (P5-P1) ═ P5-P6 or (P5-P3) ═ P5-P6), continuing to accumulate the materials in the first dipleg and the second dipleg, and repeating the operation of the step (one) after (P5-P1) - (P5-P6) > a and (P5-P3) - (P5-P6) > a, thus circularly completing the feed back.
7. The fluidized bed secondary cyclone return control method as claimed in claim 6, wherein during the return, if the differential pressure of the first dipleg (P2-P1) and the differential pressure of the second dipleg (P4-P3) do not fluctuate and are always increased, the fluidization valve is adjusted and the purge valve is opened, and the increase of the delivery pressure ensures the return to be normal.
8. The fluidized bed two-stage cyclone return control method as claimed in claim 7, wherein after the fluidization valve is adjusted to be large and the purge valve is opened, if the differential pressure (P2-P1) of the first dipleg is still not fluctuated and is increased all the time, the fluidization valve is closed, the first loosening valve is opened, and the material in the first dipleg is loosened;
after the fluidization valve is adjusted to be large and the purge valve is opened, if the pressure difference (P4-P3) of the second dipleg is not fluctuated and is increased all the time, the fluidization valve is closed, the second loosening valve is opened, and the material in the second dipleg is loosened.
9. The fluidized bed secondary cyclone feed back control method as claimed in claim 6, wherein the butterfly valve comprises a valve plate, a non-circular through hole is arranged in the valve plate along the direction of the central line, a valve rod is inserted into the non-circular through hole, and the valve rod is matched with the non-circular through hole; the side wall of the first horizontal material return pipe is provided with a valve rod groove, the bottom end of the valve rod penetrates through the non-circular through hole and is inserted into the valve rod groove, and the top end of the valve rod penetrates through the non-circular through hole and the side wall of the first horizontal material return pipe in sequence and is arranged outside the first horizontal material return pipe.
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