CN105737144A - Ash removal method suitable for fluidized bed boiler - Google Patents
Ash removal method suitable for fluidized bed boiler Download PDFInfo
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- CN105737144A CN105737144A CN201610103456.XA CN201610103456A CN105737144A CN 105737144 A CN105737144 A CN 105737144A CN 201610103456 A CN201610103456 A CN 201610103456A CN 105737144 A CN105737144 A CN 105737144A
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- sand
- fluidized
- deashing
- combustion boiler
- vertical well
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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
- F23C10/24—Devices for removal of material from the bed
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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
- F23C2206/00—Fluidised bed combustion
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Incineration Of Waste (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The invention discloses an ash removal method suitable for a fluidized bed boiler, and belongs to the technical field of ash removal of boiler equipment. The ash removal method suitable for the fluidized bed boiler comprises a sand loading step and a recycling step, and is characterized in that a sand blasting step is carried out between the sand loading step and the recycling step; in the sand loading step, sand is loaded in a sand hopper of a sand ash blower; in the sand blasting step, the sand in the sand hopper is placed in a sandblast of the sand ash blower, and is sprayed in a shaft at the tail of the fluidized bed boiler by the sandblast; and in the recycling step, after scouring a superheater, an economizer and an air pre-heater, the sand sprayed in the shaft at the tail flows into a fluidized bed of the sand ash blower, and is recycled via an auger connected to the fluidized bed. By the ash removal method suitable for the fluidized bed boiler, ash is removed by the sand, the ash on a heat exchange component in the shaft at the tail can be removed effectively, the boiler steam rate is increased, and efficiency is improved.
Description
Technical field
The present invention relates to boiler plant ash cleaning technology field, particularly relate to a kind of process for deashing suitable in fluidized-bed combustion boiler.
Background technology
CFBB adopts single drum, natural circulation mode, is divided into front portion and two vertical shafts of afterbody generally.Anterior vertical shaft is for always to hang structure, and surrounding is made up of fin panel casing.From bottom to top, air compartment, emulsion zone, a dilute-phase zone it are followed successively by.Tail vertical well adopts supporting construction, is connected by vertical cyclone separator between two vertical shafts, and separator bottom couples loop back device and ash cooler.Combustor and separator interior are equipped with abrasionproof liner, anterior vertical shaft Ao's pipe furnace wall, external metal casing, tail vertical well light boiler setting, eight steel columns bear boiler total weight.CFBB mainly uses high-ash inferior fuel, coal is after hearth combustion, substantial amounts of grey particle is carried to upper furnace by flue gas, a part of separated device of thicker grey particle separates and continues to send burner hearth back to, the grey particle that another part is thinner can not be trapped and escaped by separated device, with flue gas to tail vertical well, tail vertical well lining is equipped with the heat exchanger components such as high temperature superheater, reheater, low temperature superheater, economizer, air preheater；This part fine ash particle all can cohere on the heat exchanger components such as high temperature superheater, reheater, low temperature superheater, economizer, air preheater due to a variety of causes, and this phenomenon is " dust stratification "；" dust stratification " can make the heat exchange efficiency of these heat exchanger components be greatly lowered, and even loses heat exchange function, so that boiler output reduces, efficiency reduces.Generation in order to avoid " dust stratification " phenomenon; boiler factory would generally adopt various soot blower to carry out deashing process; as: steam sootblower, acoustic wave ash ejector, gas explosion pulse soot blower, pulse of compressed air soot blower etc.; along with coming into operation gradually of these soot blowers; the situation making dust stratification considerably reduces, and serves good soot blowing effect.Especially for the grey particle that those cohesivenesses are less, effect is especially pronounced.
But, prolongation along with the time of use, the defect of various soot blowers is also completely exposed, such as steam sootblower soot blowing, blow less than high temperature superheater, reheater, low temperature superheater, economizer, these heat exchanger components of air preheater tube bank center ash, when soot blowing terminates, steam can condense into water and flow to flue by ash blowing mouth, make ash be set on the pipe of these heat exchanger components cannot remove, cause tube failure；And for example pulse of compressed air soot blower soot blowing, if the intensity of pulse is excessive, the sealing that will make furnace wall wrecks, the healthy of neighbouring personnel also there is impact simultaneously, therefore, pulse of compressed air soot blower is owing to being subject to pulse strength and the restriction of impulse wave frequency, and the effect of soot blowing is had a greatly reduced quality.Further, both soot blowers need to consume mass energy, and energy consumption is higher.
Publication number is CN203309892U, the Chinese patent literature that publication date is on November 27th, 2013 discloses a kind of high-efficiency energy-saving circulating fluidized-bed combustion boiler, it is characterized in that: vertically the rear portion of down pass is provided with vertical updraught flue, the outlet of burner hearth connects with the upper end entrance of described vertical down pass, the smokestack improving the tangential flow velocity of flue gas is arranged between described vertical down pass and described vertical updraught flue, it is provided with high-temperature separator in described vertical updraught flue, the outlet upper end of described vertical updraught flue is connected with described superheater, described vertical down pass and vertical updraught flue bottom are provided with ash-pit, described ash-pit is provided with the returning charge mouth connected with described burner hearth.
High-efficiency energy-saving circulating fluidized-bed combustion boiler disclosed in this patent documentation, after using a period of time, easy dust stratification on high-temperature separator, superheater, cause that heat exchange efficiency is greatly lowered, even losing heat exchange function, cause whole CFBB to be exerted oneself reduction, efficiency reduces.
Publication number is CN203147750U, the Chinese patent literature that publication date is on 08 21st, 2013 discloses a kind of energy-efficient double speed CFBB, combustor, heat pipe, blast cap it is provided with in furnace chamber, combustor connects flue, flue is provided with heat exchanger and economizer, it is characterised in that: combustor is separated into high speed bed combustor and funnel shaped low speed bed combustor by barrier film, and both communicate by upper and lower side, low speed bed combustor is positioned at flue side, and blast cap is positioned at below high speed bed combustor；Being provided with air preheater in flue, one time air channel, secondary air duct flow through air preheater, and air preheater is provided with temperature feedback arrangement.
Energy-efficient double speed CFBB disclosed in this patent documentation, ventilated by air channel, a secondary air duct, although the soot particle that part is attached on air preheater can be blown away, but, but it being difficult to blow to the ash at these heat exchanger components of air preheater tube bank center, soot blowing is not thorough, soot blowing effect is poor, affecting heat exchange efficiency, cause whole CFBB to be exerted oneself little, efficiency is low.
Summary of the invention
The present invention is in order to overcome the defect of above-mentioned prior art, it is provided that a kind of process for deashing suitable in fluidized-bed combustion boiler, and the present invention adopts sand ash disposal, it is possible to the ash effectively removed in tail vertical well on heat exchanger components, increases boiler output, improves efficiency.
The present invention is achieved through the following technical solutions:
A kind of process for deashing suitable in fluidized-bed combustion boiler, including sand loading step and recycling step, it is characterised in that: also having sandblasting step between described sand loading step and recycling step, described sand loading step refers in the sand hopper that sand is contained in sand soot blower；Described sandblasting step refers to that, in the sanding machine that the sand in sand hopper is put into sand soot blower, sand is sprayed in the tail vertical well of fluidized-bed combustion boiler by sanding machine；Described recycling step refers to that the sand spraying in tail vertical well flow in the fluid bed of sand soot blower after washing away superheater, economizer and air preheater, is connected the auger for sand reclamation on fluid bed.
Sandblasting speed in described sandblasting step is 5-10 Grams Per Second.
Sandblasting frequency in described sandblasting step is 3-5 time/hour.
Described sand soot blower includes sand hopper, is connected to the sanding machine at tail vertical well top and is connected to the fluid bed bottom tail vertical well, sanding machine includes buncher, belt pulley, driving belt, blast tube and the bearing being connected on blast tube, sand hopper is connected with blast tube by sand-feeding tube, the motor shaft of buncher is connected with pulley drive, belt pulley is connected with bearing-transmission by driving belt, blast tube connects with tail vertical well, fluid bed is connected to by motor-driven auger.
The rotating speed of described buncher is 2000-3000 rev/min.
Being connected to air-introduced machine on tail vertical well top, air-introduced machine is connected to blast pipe, blast pipe is connected with blast tube.
Described blast tube is formed by connecting by through contraction section, cylindrical section and expansion segment from top to bottom, and contraction section is connected with blast pipe.
Being provided with rotation dish on described blast tube, rotation dish and expansion segment are rotationally connected, and rotation dish is driven by the electric rotating machine being connected on tail vertical well inner roof wall, and rotation dish is evenly distributed with multiple blow hole.
Being connected to " L " type support on tail vertical well inner roof wall, electric rotating machine is connected on " L " type support.
Running through on described rotation dish and be connected to middle siphunculus, middle siphunculus is cased with bottom, bottom is connected to three blast pipes, the angle that any two adjacent blast pipes are formed is 15 degree.
Being connected to bracing frame on the outer wall of described sand hopper, bracing frame is fixed on tail vertical well roof.
Being connected to sieve plate in described fluid bed, fluid bed is separated into first class room and is positioned at the second fluidising chamber below first class room by sieve plate.
Being provided with induced-draught fan on described fluid bed, induced-draught fan is connected with first class room by aspiration channel.
Being additionally provided with the first roots blower and the second roots blower on described fluid bed, the first roots blower is connected to the side of the second fluidising chamber, and the second roots blower is connected to the opposite side of the second fluidising chamber.
Described auger is formed by connecting by vertical section, segmental arc and tilting section successively.
Being provided with dust bag on described induced-draught fan, dust bag is detachable with induced-draught fan to be connected.
Beneficial effects of the present invention main manifestations is in the following areas:
One, the present invention, also has sandblasting step between sand loading step and recycling step, sand loading step refers in the sand hopper that sand is contained in sand soot blower；Sandblasting step refers to that, in the sanding machine that the sand in sand hopper is put into sand soot blower, sand is sprayed in the tail vertical well of fluidized-bed combustion boiler by sanding machine；Recycling step refers to that the sand spraying in tail vertical well flow to after washing away superheater, economizer and air preheater in the fluid bed of sand soot blower, it is connected the auger for sand reclamation on fluid bed, sand is adopted to carry out sandblasting, flow owing to sand is as flue gas, therefore, the ash in the tube bank centre of the heat exchanger components such as superheater, economizer, air preheater also can remove, it is possible to effectively increases boiler output, improves efficiency；Sand process for deashing is compared with the better effects if of prior art steam soot blowing, effective, lower in cost；Owing to not producing sound wave or shock wave, because without the health of people is produced harmful effect, improve safety in utilization.
Two, the present invention, sandblasting speed in sandblasting step is 5-10 Grams Per Second, adopt this specific sandblasting speed can either effectively wash away the dust on these heat exchanger components of superheater, economizer and air preheater, be prevented from again sand impulsive force and cross these heat exchanger components of macrolesion superheater, economizer and air preheater.
Three, the present invention, the sandblasting frequency in sandblasting step is 3-5 time/hour, adopts this specific sandblasting frequency, it is possible to thoroughly effectively remove the dust on these heat exchanger components of superheater, economizer and air preheater, it is prevented that pile up, it is ensured that the heat exchange efficiency of heat exchanger components.
Four, the present invention, sand soot blower includes sand hopper, it is connected to the sanding machine at tail vertical well top and is connected to the fluid bed bottom tail vertical well, sanding machine includes buncher, belt pulley, driving belt, blast tube and the bearing being connected on blast tube, sand hopper is connected with blast tube by sand-feeding tube, the motor shaft of buncher is connected with pulley drive, belt pulley is connected with bearing-transmission by driving belt, blast tube connects with tail vertical well, fluid bed is connected to by motor-driven auger, during use, sand in sand hopper is put into blast tube through sand-feeding tube, sand flows through the superheater of tail vertical well, economizer and air preheater, the dust sticked on these heat exchanger components is washed out, it is achieved thereby that soot blowing purpose, improve the heat exchange efficiency of heat exchanger components；Flowing owing to sand is as flue gas, therefore, the ash in the tube bank centre of the heat exchanger components such as superheater, economizer, air preheater also can remove, greatly improve dedusting effect, owing to being sand ash disposal, rather than high-temperature steam, combustion gas, sound wave etc., greatly reduce energy consumption.
Five, the present invention, the rotating speed of buncher is 2000-3000 rev/min, it is possible to make the sand in sand hopper fall into smoothly in blast tube, it is prevented that block in blast tube, is beneficial to guarantee sandblasting effect.
Six, the present invention, tail vertical well top is connected to air-introduced machine, and air-introduced machine is connected to blast pipe, blast pipe is connected with blast tube, introduces wind by air-introduced machine in blast tube, and wind speed can drive sand quickly to fall on heat exchanger components, dust on heat exchanger components is taken away, improves soot blowing efficiency.
Seven, the present invention, blast tube is formed by connecting by through contraction section, cylindrical section and expansion segment from top to bottom, contraction section is connected with blast pipe, adopt the blast tube of this Venturi tube structure, it is further enhanced from expansion segment wind speed out, improve the spouting velocity of sand, thus improving efficiency of dust collection further.
Eight, the present invention, blast tube is provided with rotation dish, rotation dish and expansion segment are rotationally connected, rotation dish is driven by the electric rotating machine being connected on tail vertical well inner roof wall, being evenly distributed with multiple blow hole on rotation dish, by the rotation of rotation dish, sand is sprayed on heat exchanger components uniformly under centrifugal action, can wash out substantial amounts of for the dust on heat exchanger components central tube bundle, improve the heat exchange efficiency of heat exchanger components.
Nine, the present invention, tail vertical well inner roof wall is connected to " L " type support, electric rotating machine is connected on " L " type support, by adopting " L " type support, on the one hand, convenient fixing with tail vertical well inner roof wall is connected, on the other hand, one good support of electric rotating machine can be given, it is ensured that electric rotating machine job stability.
Ten, the present invention, rotation dish runs through and is connected to middle siphunculus, middle siphunculus is cased with bottom, being connected to three blast pipes on bottom, the angle that any two adjacent blast pipes are formed is 15 degree, adopts the blast pipe of this special angle to arrange, the spraying range of sand can be reduced, the ash that sand can large-area wash away on heat exchanger components can either be ensured, the spray rate of sand can be improved again, strengthen soot blowing effect.
11, the present invention, the outer wall of sand hopper is connected to bracing frame, and bracing frame is fixed on tail vertical well roof, and bracing frame can give the support force that sand hopper is good, ensures the normal sand loading of sand hopper and shakes out.
12, the present invention, is connected to sieve plate in fluid bed, fluid bed is separated into first class room and is positioned at the second fluidising chamber below first class room by sieve plate, can be sieved in auger by maximized for sand by sieve plate, it is simple to the recovery of sand.
13, the present invention, fluid bed is provided with induced-draught fan, and induced-draught fan is connected with first class room by aspiration channel, and the most of dust being blended in sand can be siphoned away by induced-draught fan, improves the response rate of sand.
14, the present invention, fluid bed is additionally provided with the first roots blower and the second roots blower, first roots blower is connected to the side of the second fluidising chamber, second roots blower is connected to the opposite side of the second fluidising chamber, by the first roots blower being correspondingly arranged and the second roots blower, can being blown away by the small part dust that remain in sand, ash disposal is more thorough, greatly improves the response rate of sand.
15, the present invention, auger is formed by connecting by vertical section, segmental arc and tilting section successively, it is possible to prevent sand accumulated plugging in auger, is beneficial to the recovery speed improving sand.
16, the present invention, induced-draught fan is provided with dust bag, and dust bag is detachable with induced-draught fan to be connected, it is simple to collects and clears up, on heat exchanger components, the dust got off, has good environment protecting.
Accompanying drawing explanation
Below in conjunction with specification drawings and specific embodiments, the present invention is described in further detail, wherein:
Fig. 1 is the structural representation that in the embodiment of the present invention 2, sand soot blower is arranged on boiler；
Fig. 2 is the structural representation that in the embodiment of the present invention 5, sand soot blower is arranged on boiler；
Fig. 3 is the structural representation of rotation dish in the embodiment of the present invention 5；
Labelling in figure: 1, sand hopper, 2, tail vertical well, 3, superheater, 4, economizer, 5, air preheater, 6, fluid bed, 7, auger, 8, buncher, 9, belt pulley, 10, driving belt, 11, blast tube, 12, bearing, 13, sand-feeding tube, 14, motor, 15, air-introduced machine, 16, blast pipe, 17, rotation dish, 18, electric rotating machine, 19, blow hole, 20, support, 21, middle siphunculus, 22, bottom, 23, blast pipe, 24, bracing frame, 25, sieve plate, 26, first class room, 27, second fluidising chamber, 28, induced-draught fan, 29, aspiration channel, 30, first roots blower, 31, second roots blower, 32, dust bag.
Detailed description of the invention
Embodiment 1
Referring to Fig. 1, a kind of process for deashing suitable in fluidized-bed combustion boiler, including sand loading step and recycling step, also having sandblasting step between described sand loading step and recycling step, described sand loading step refers in the sand hopper 1 that sand is contained in sand soot blower；Described sandblasting step refers to that, in the sanding machine that the sand in sand hopper 1 is put into sand soot blower, sand is sprayed in the tail vertical well 2 of fluidized-bed combustion boiler by sanding machine；Described recycling step refers to that the sand sprayed in tail vertical well 2 flow in the fluid bed 6 of sand soot blower after washing away superheater 3, economizer 4 and air preheater 5, is connected auger 7 for sand reclamation on fluid bed 6.
The present embodiment is most basic embodiment, also has sandblasting step between sand loading step and recycling step, and sand loading step refers in the sand hopper that sand is contained in sand soot blower；Sandblasting step refers to that, in the sanding machine that the sand in sand hopper is put into sand soot blower, sand is sprayed in the tail vertical well of fluidized-bed combustion boiler by sanding machine；Recycling step refers to that the sand spraying in tail vertical well flow to after washing away superheater, economizer and air preheater in the fluid bed of sand soot blower, it is connected the auger for sand reclamation on fluid bed, sand is adopted to carry out sandblasting, flow owing to sand is as flue gas, therefore, the ash in the tube bank centre of the heat exchanger components such as superheater, economizer, air preheater also can remove, it is possible to effectively increases boiler output, improves efficiency；Sand process for deashing is compared with the better effects if of prior art steam soot blowing, effective, lower in cost；Owing to not producing sound wave or shock wave, because without the health of people is produced harmful effect, improve safety in utilization.
Embodiment 2
Referring to Fig. 1, a kind of process for deashing suitable in fluidized-bed combustion boiler, including sand loading step and recycling step, also having sandblasting step between described sand loading step and recycling step, described sand loading step refers in the sand hopper 1 that sand is contained in sand soot blower；Described sandblasting step refers to that, in the sanding machine that the sand in sand hopper 1 is put into sand soot blower, sand is sprayed in the tail vertical well 2 of fluidized-bed combustion boiler by sanding machine；Described recycling step refers to that the sand sprayed in tail vertical well 2 flow in the fluid bed 6 of sand soot blower after washing away superheater 3, economizer 4 and air preheater 5, is connected auger 7 for sand reclamation on fluid bed 6.
Sandblasting speed in described sandblasting step is 5 Grams Per Seconds.
Sandblasting frequency in described sandblasting step is 3 times/hour.
Described sand soot blower includes sand hopper 1, is connected to the sanding machine at tail vertical well 2 top and is connected to the fluid bed 6 bottom tail vertical well 2, sanding machine includes buncher 8, belt pulley 9, driving belt 10, blast tube 11 and the bearing 12 being connected on blast tube 11, sand hopper 1 is connected with blast tube 11 by sand-feeding tube 13, the motor shaft of buncher 8 and belt pulley 9 are in transmission connection, belt pulley 9 is in transmission connection by driving belt 10 and bearing 12, blast tube 11 connects with tail vertical well 2, and fluid bed 6 is connected to the auger 7 driven by motor 14.
The rotating speed of described buncher 8 is 2000 revs/min.
The present embodiment is a better embodiment, sand soot blower includes sand hopper, it is connected to the sanding machine at tail vertical well top and is connected to the fluid bed bottom tail vertical well, sanding machine includes buncher, belt pulley, driving belt, blast tube and the bearing being connected on blast tube, sand hopper is connected with blast tube by sand-feeding tube, the motor shaft of buncher is connected with pulley drive, belt pulley is connected with bearing-transmission by driving belt, blast tube connects with tail vertical well, fluid bed is connected to by motor-driven auger, during use, sand in sand hopper is put into blast tube through sand-feeding tube, sand flows through the superheater of tail vertical well, economizer and air preheater, the dust sticked on these heat exchanger components is washed out, it is achieved thereby that soot blowing purpose, improve the heat exchange efficiency of heat exchanger components；Flowing owing to sand is as flue gas, therefore, the ash in the tube bank centre of the heat exchanger components such as superheater, economizer, air preheater also can remove, greatly improve dedusting effect, owing to being sand ash disposal, rather than high-temperature steam, combustion gas, sound wave etc., greatly reduce energy consumption.
Embodiment 3
Referring to Fig. 1, a kind of process for deashing suitable in fluidized-bed combustion boiler, including sand loading step and recycling step, also having sandblasting step between described sand loading step and recycling step, described sand loading step refers in the sand hopper 1 that sand is contained in sand soot blower；Described sandblasting step refers to that, in the sanding machine that the sand in sand hopper 1 is put into sand soot blower, sand is sprayed in the tail vertical well 2 of fluidized-bed combustion boiler by sanding machine；Described recycling step refers to that the sand sprayed in tail vertical well 2 flow in the fluid bed 6 of sand soot blower after washing away superheater 3, economizer 4 and air preheater 5, is connected auger 7 for sand reclamation on fluid bed 6.
Sandblasting speed in described sandblasting step is 6 Grams Per Seconds.
Sandblasting frequency in described sandblasting step is 4 times/hour.
Described sand soot blower includes sand hopper 1, is connected to the sanding machine at tail vertical well 2 top and is connected to the fluid bed 6 bottom tail vertical well 2, sanding machine includes buncher 8, belt pulley 9, driving belt 10, blast tube 11 and the bearing 12 being connected on blast tube 11, sand hopper 1 is connected with blast tube 11 by sand-feeding tube 13, the motor shaft of buncher 8 and belt pulley 9 are in transmission connection, belt pulley 9 is in transmission connection by driving belt 10 and bearing 12, blast tube 11 connects with tail vertical well 2, and fluid bed 6 is connected to the auger 7 driven by motor 14.
The rotating speed of described buncher 8 is 2200 revs/min.
Being connected to air-introduced machine 15 on tail vertical well 2 top, air-introduced machine 15 is connected to blast pipe 16, blast pipe 16 is connected with blast tube 11.
Described blast tube 11 is formed by connecting by through contraction section, cylindrical section and expansion segment from top to bottom, and contraction section is connected with blast pipe 16.
Being provided with rotation dish 17 on described blast tube 11, rotation dish 17 and expansion segment are rotationally connected, and rotation dish 17 is driven by the electric rotating machine 18 being connected on tail vertical well 2 inner roof wall, and rotation dish 17 is evenly distributed with multiple blow hole 19.
Being connected to " L " type support 20 on tail vertical well 2 inner roof wall, electric rotating machine 18 is connected on " L " type support 20.
The present embodiment is another better embodiment, tail vertical well is connected to air-introduced machine on top, air-introduced machine is connected to blast pipe, blast pipe is connected with blast tube, in blast tube, wind is introduced by air-introduced machine, wind speed can drive sand quickly to fall on heat exchanger components, is taken away by the dust on heat exchanger components, improves soot blowing efficiency.Blast tube is formed by connecting by through contraction section, cylindrical section and expansion segment from top to bottom, contraction section is connected with blast pipe, adopts the blast tube of this Venturi tube structure, is further enhanced from expansion segment wind speed out, improve the spouting velocity of sand, thus improving efficiency of dust collection further.Blast tube is provided with rotation dish, rotation dish and expansion segment are rotationally connected, rotation dish is driven by the electric rotating machine being connected on tail vertical well inner roof wall, rotation dish is evenly distributed with multiple blow hole, rotation by rotation dish, sand is sprayed on heat exchanger components uniformly under centrifugal action, it is possible to wash out substantial amounts of for the dust on heat exchanger components central tube bundle, improves the heat exchange efficiency of heat exchanger components.Being connected to " L " type support on tail vertical well inner roof wall, electric rotating machine is connected on " L " type support, by adopting " L " type support, on the one hand, convenient fixing with tail vertical well inner roof wall is connected, on the other hand, one good support of electric rotating machine can be given, it is ensured that electric rotating machine job stability.
Embodiment 4
Referring to Fig. 2 and Fig. 3, a kind of process for deashing suitable in fluidized-bed combustion boiler, including sand loading step and recycling step, also having sandblasting step between described sand loading step and recycling step, described sand loading step refers in the sand hopper 1 that sand is contained in sand soot blower；Described sandblasting step refers to that, in the sanding machine that the sand in sand hopper 1 is put into sand soot blower, sand is sprayed in the tail vertical well 2 of fluidized-bed combustion boiler by sanding machine；Described recycling step refers to that the sand sprayed in tail vertical well 2 flow in the fluid bed 6 of sand soot blower after washing away superheater 3, economizer 4 and air preheater 5, is connected auger 7 for sand reclamation on fluid bed 6.
Sandblasting speed in described sandblasting step is 8 Grams Per Seconds.
Sandblasting frequency in described sandblasting step is 4 times/hour.
Described sand soot blower includes sand hopper 1, is connected to the sanding machine at tail vertical well 2 top and is connected to the fluid bed 6 bottom tail vertical well 2, sanding machine includes buncher 8, belt pulley 9, driving belt 10, blast tube 11 and the bearing 12 being connected on blast tube 11, sand hopper 1 is connected with blast tube 11 by sand-feeding tube 13, the motor shaft of buncher 8 and belt pulley 9 are in transmission connection, belt pulley 9 is in transmission connection by driving belt 10 and bearing 12, blast tube 11 connects with tail vertical well 2, and fluid bed 6 is connected to the auger 7 driven by motor 14.
The rotating speed of described buncher 8 is 2500 revs/min.
Being connected to air-introduced machine 15 on tail vertical well 2 top, air-introduced machine 15 is connected to blast pipe 16, blast pipe 16 is connected with blast tube 11.
Described blast tube 11 is formed by connecting by through contraction section, cylindrical section and expansion segment from top to bottom, and contraction section is connected with blast pipe 16.
Being provided with rotation dish 17 on described blast tube 11, rotation dish 17 and expansion segment are rotationally connected, and rotation dish 17 is driven by the electric rotating machine 18 being connected on tail vertical well 2 inner roof wall, and rotation dish 17 is evenly distributed with multiple blow hole 19.
Being connected to " L " type support 20 on tail vertical well 2 inner roof wall, electric rotating machine 18 is connected on " L " type support 20.
Running through on described rotation dish 17 and be connected to middle siphunculus 21, middle siphunculus 21 is cased with bottom 22, bottom 22 is connected to three blast pipes 23, the angle that any two adjacent blast pipes 23 are formed is 15 degree.
Being connected to bracing frame 24 on the outer wall of described sand hopper 1, bracing frame 24 is fixed on tail vertical well 2 roof.
The present embodiment is another better embodiment, rotation dish runs through and is connected to middle siphunculus, middle siphunculus is cased with bottom, being connected to three blast pipes on bottom, the angle that any two adjacent blast pipes are formed is 15 degree, adopts the blast pipe of this special angle to arrange, the spraying range of sand can be reduced, the ash that sand can large-area wash away on heat exchanger components can either be ensured, the spray rate of sand can be improved again, strengthen soot blowing effect.Being connected to bracing frame on the outer wall of sand hopper, bracing frame is fixed on tail vertical well roof, and bracing frame can give the support force that sand hopper is good, ensures the normal sand loading of sand hopper and shakes out.
Embodiment 5
Referring to Fig. 2 and Fig. 3, a kind of process for deashing suitable in fluidized-bed combustion boiler, including sand loading step and recycling step, also having sandblasting step between described sand loading step and recycling step, described sand loading step refers in the sand hopper 1 that sand is contained in sand soot blower；Described sandblasting step refers to that, in the sanding machine that the sand in sand hopper 1 is put into sand soot blower, sand is sprayed in the tail vertical well 2 of fluidized-bed combustion boiler by sanding machine；Described recycling step refers to that the sand sprayed in tail vertical well 2 flow in the fluid bed 6 of sand soot blower after washing away superheater 3, economizer 4 and air preheater 5, is connected auger 7 for sand reclamation on fluid bed 6.
Sandblasting speed in described sandblasting step is 10 Grams Per Seconds.
Sandblasting frequency in described sandblasting step is 5 times/hour.
Described sand soot blower includes sand hopper 1, is connected to the sanding machine at tail vertical well 2 top and is connected to the fluid bed 6 bottom tail vertical well 2, sanding machine includes buncher 8, belt pulley 9, driving belt 10, blast tube 11 and the bearing 12 being connected on blast tube 11, sand hopper 1 is connected with blast tube 11 by sand-feeding tube 13, the motor shaft of buncher 8 and belt pulley 9 are in transmission connection, belt pulley 9 is in transmission connection by driving belt 10 and bearing 12, blast tube 11 connects with tail vertical well 2, and fluid bed 6 is connected to the auger 7 driven by motor 14.
The rotating speed of described buncher 8 is 3000 revs/min.
Being connected to air-introduced machine 15 on tail vertical well 2 top, air-introduced machine 15 is connected to blast pipe 16, blast pipe 16 is connected with blast tube 11.
Described blast tube 11 is formed by connecting by through contraction section, cylindrical section and expansion segment from top to bottom, and contraction section is connected with blast pipe 16.
Being provided with rotation dish 17 on described blast tube 11, rotation dish 17 and expansion segment are rotationally connected, and rotation dish 17 is driven by the electric rotating machine 18 being connected on tail vertical well 2 inner roof wall, and rotation dish 17 is evenly distributed with multiple blow hole 19.
Being connected to " L " type support 20 on tail vertical well 2 inner roof wall, electric rotating machine 18 is connected on " L " type support 20.
Running through on described rotation dish 17 and be connected to middle siphunculus 21, middle siphunculus 21 is cased with bottom 22, bottom 22 is connected to three blast pipes 23, the angle that any two adjacent blast pipes 23 are formed is 15 degree.
Being connected to bracing frame 24 on the outer wall of described sand hopper 1, bracing frame 24 is fixed on tail vertical well 2 roof.
Being connected to sieve plate 25 in described fluid bed 6, fluid bed 6 is separated into first class room 26 and is positioned at the second fluidising chamber 27 below first class room 26 by sieve plate 25.
Being provided with induced-draught fan 28 on described fluid bed 6, induced-draught fan 28 is connected with first class room 26 by aspiration channel 29.
Being additionally provided with the first roots blower 30 and the second roots blower 31 on described fluid bed 6, the first roots blower 30 is connected to the side of the second fluidising chamber 27, and the second roots blower 31 is connected to the opposite side of the second fluidising chamber 27.
Described auger 7 is formed by connecting by vertical section, segmental arc and tilting section successively.
Being provided with dust bag 32 on described induced-draught fan 28, dust bag 32 is detachable with induced-draught fan 28 to be connected.
The present embodiment is preferred forms, is connected to sieve plate in fluid bed, and fluid bed is separated into first class room and is positioned at the second fluidising chamber below first class room by sieve plate, can be sieved in auger by maximized for sand by sieve plate, it is simple to the recovery of sand.Being provided with induced-draught fan on fluid bed, induced-draught fan is connected with first class room by aspiration channel, and the most of dust being blended in sand can be siphoned away by induced-draught fan, improves the response rate of sand.Fluid bed is additionally provided with the first roots blower and the second roots blower, first roots blower is connected to the side of the second fluidising chamber, second roots blower is connected to the opposite side of the second fluidising chamber, by the first roots blower being correspondingly arranged and the second roots blower, the small part dust remained in sand can be blown away, ash disposal is more thorough, greatly improves the response rate of sand.
Auger is formed by connecting by vertical section, segmental arc and tilting section successively, it is possible to prevent sand accumulated plugging in auger, is beneficial to the recovery speed improving sand.Being provided with dust bag on induced-draught fan, dust bag is detachable with induced-draught fan to be connected, it is simple to collects and clears up, on heat exchanger components, the dust got off, has good environment protecting.
Claims (16)
1. the process for deashing being applicable to fluidized-bed combustion boiler, including sand loading step and recycling step, it is characterized in that: also having sandblasting step between described sand loading step and recycling step, described sand loading step refers in the sand hopper (1) that sand is contained in sand soot blower；Described sandblasting step refers to that, in the sanding machine that the sand in sand hopper (1) is put into sand soot blower, sand is sprayed in the tail vertical well (2) of fluidized-bed combustion boiler by sanding machine；Described recycling step refers to that the sand sprayed in tail vertical well (2) flow in the fluid bed (6) of sand soot blower after washing away superheater (3), economizer (4) and air preheater (5), is connected auger (7) for sand reclamation on fluid bed (6).
2. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 1, it is characterised in that: the sandblasting speed in described sandblasting step is 5-10 Grams Per Second.
3. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 1, it is characterised in that: the sandblasting frequency in described sandblasting step is 3-5 time/hour.
null4. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 1，It is characterized in that: described sand soot blower includes sand hopper (1)、It is connected to the sanding machine at tail vertical well (2) top and is connected to the fluid bed (6) of tail vertical well (2) bottom，Sanding machine includes buncher (8)、Belt pulley (9)、Driving belt (10)、Blast tube (11) and the bearing (12) being connected on blast tube (11)，Sand hopper (1) is connected with blast tube (11) by sand-feeding tube (13)，The motor shaft of buncher (8) and belt pulley (9) are in transmission connection，Belt pulley (9) is in transmission connection by driving belt (10) and bearing (12)，Blast tube (11) connects with tail vertical well (2)，Fluid bed (6) is connected to the auger (7) driven by motor (14).
5. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 1, it is characterised in that: the rotating speed of described buncher (8) is 2000-3000 rev/min.
6. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 4, it is characterized in that: tail vertical well (2) top is connected to air-introduced machine (15), being connected to blast pipe (16) on air-introduced machine (15), blast pipe (16) is connected with blast tube (11).
7. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 6, it is characterised in that: described blast tube (11) is formed by connecting by through contraction section, cylindrical section and expansion segment from top to bottom, and contraction section is connected with blast pipe (16).
8. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 7, it is characterized in that: described blast tube (11) is provided with rotation dish (17), rotation dish (17) and expansion segment are rotationally connected, rotation dish (17) is driven by the electric rotating machine (18) being connected on tail vertical well (2) inner roof wall, and rotation dish (17) is evenly distributed with multiple blow hole (19).
9. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 8, it is characterised in that: being connected to " L " type support (20) on tail vertical well (2) inner roof wall, electric rotating machine (18) is connected on " L " type support (20).
10. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 9, it is characterized in that: described rotation dish (17) is run through being connected to middle siphunculus (21), middle siphunculus (21) is cased with bottom (22), being connected to three blast pipes (23) on bottom (22), the angle that any two adjacent blast pipes (23) are formed is 15 degree.
11. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 10, it is characterised in that: being connected to bracing frame (24) on the outer wall of described sand hopper (1), bracing frame (24) is fixed on tail vertical well (2) roof.
12. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 11, it is characterized in that: be connected to sieve plate (25) in described fluid bed (6), fluid bed (6) is separated into first class room (26) and is positioned at second fluidising chamber (27) of lower section, first class room (26) by sieve plate (25).
13. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 12, it is characterised in that: being provided with induced-draught fan (28) on described fluid bed (6), induced-draught fan (28) is connected with first class room (26) by aspiration channel (29).
14. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 13, it is characterized in that: described fluid bed (6) is additionally provided with the first roots blower (30) and the second roots blower (31), first roots blower (30) is connected to the side of the second fluidising chamber (27), and the second roots blower (31) is connected to the opposite side of the second fluidising chamber (27).
15. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 14, it is characterised in that: described auger (7) is formed by connecting by vertical section, segmental arc and tilting section successively.
16. a kind of process for deashing suitable in fluidized-bed combustion boiler according to claim 15, it is characterised in that: being provided with dust bag (32) on described induced-draught fan (28), dust bag (32) is detachable with induced-draught fan (28) to be connected.
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| CN107461749A (en) * | 2017-08-10 | 2017-12-12 | 清华大学 | A kind of material circulating system |
| WO2021087637A1 (en) * | 2019-11-04 | 2021-05-14 | 深圳市能源环保有限公司 | Sandblasting ash removal method for heating surface of waste heat boiler in waste incineration power plant |
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| WO2021087637A1 (en) * | 2019-11-04 | 2021-05-14 | 深圳市能源环保有限公司 | Sandblasting ash removal method for heating surface of waste heat boiler in waste incineration power plant |
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| CN105737144B (en) | 2018-01-05 |
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