CN105737144B - A kind of process for deashing suitable for fluidized-bed combustion boiler - Google Patents
A kind of process for deashing suitable for fluidized-bed combustion boiler Download PDFInfo
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- CN105737144B CN105737144B CN201610103456.XA CN201610103456A CN105737144B CN 105737144 B CN105737144 B CN 105737144B CN 201610103456 A CN201610103456 A CN 201610103456A CN 105737144 B CN105737144 B CN 105737144B
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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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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
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Abstract
The invention discloses a kind of process for deashing suitable for fluidized-bed combustion boiler, belongs to boiler plant ash cleaning technology field, including sand loading step and recycling step, it is characterised in that：There is sandblasting step between the sand loading step and recycling step, the sand loading step refers to sand is contained in the sand hopper of sand soot blower；The sandblasting step refers to be put into the sand in sand hopper in the sanding machine of sand soot blower, and sanding machine sprays into sand in the tail vertical well of fluidized-bed combustion boiler；The sand that the recycling step refers to spray into tail vertical well is flow in the fluid bed of sand soot blower after washing away superheater, economizer and air preheater, the auger sand reclamation through being connected on fluid bed.The present invention uses sand ash disposal, can effectively remove the ash in tail vertical well on heat exchanger components, increases boiler output, improves efficiency.
Description
Technical field
The present invention relates to boiler plant ash cleaning technology field, more particularly to a kind of ash disposal side suitable for fluidized-bed combustion boiler
Method.
Background technology
CFBB uses single drum, natural circulation mode, is generally divided into anterior and two vertical shafts of afterbody.Before
Always to hang structure, surrounding is made up of portion's vertical shaft fin panel casing.From bottom to top, air compartment, emulsion zone, a dilute-phase zone are followed successively by.
Tail vertical well uses supporting construction, is connected between two vertical shafts by vertical cyclone separator, separator bottom connection loop back device
And ash cooler.Combustion chamber 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, boiler total weight is born by eight steel columns.CFBB mainly uses high ash content
Inferior fuel, for coal after hearth combustion, substantial amounts of grey particle is carried to upper furnace by flue gas, the thicker grey particle of a part
The device separation that is separated continues to send back to burner hearth, and the thinner grey particle of another part device that can not be separated is trapped and escaped, with flue gas
To tail vertical well, tail vertical well lining is equipped with high temperature superheater, reheater, low temperature superheater, economizer, air preheater etc. and changed
Thermal part；This part fine ash particle can be all cohered in high temperature superheater, reheater, low temperature superheater, province's coal due to a variety of causes
On the heat exchanger components such as device, air preheater, this phenomenon is " dust stratification "；" dust stratification " can make the heat exchange efficiency of these heat exchanger components big
To reduce, or even heat exchange function is lost, so that boiler output reduces, efficiency reduces.In order to avoid the generation of " dust stratification " phenomenon,
Boiler factory would generally use various soot blowers to carry out deashing processing, such as：Steam sootblower, acoustic wave ash ejector, gas explosion pulse
Soot blower, pulse of compressed air soot blower etc., with gradually coming into operation for these soot blowers, the situation of dust stratification is set greatly to subtract
Gently, good soot blowing effect is served.It is especially pronounced especially for the less grey particle of those cohesivenesses, effect.
But be also completely exposed with the extension of usage time, the defects of various soot blowers, such as steam sootblower soot blowing,
Blow less than high temperature superheater, reheater, low temperature superheater, economizer, air preheater these heat exchanger components tube bank center ash,
At the end of soot blowing, steam can condense into water and flow into flue by ash blowing mouth, ash is set in the pipe of these heat exchanger components
It can not above remove, cause tube failure；And for example pulse of compressed air soot blower soot blowing, will if the intensity of pulse is excessive
The sealing of furnace wall is wrecked, while also have an impact to the health of neighbouring personnel, therefore, pulse of compressed air soot blower
Due to being limited by pulse strength and pulse wave frequency rate, the effect of soot blowing is had a greatly reduced quality.Also, both soot blowers need to disappear
Mass energy is consumed, energy consumption is higher.
Publication No. CN 203309892U, publication date disclose one kind for the Chinese patent literature on November 27th, 2013
High-efficiency energy-saving circulating fluidized-bed combustion boiler, it is characterized in that：The rear portion of vertical down pass is disposed with vertical updraught flue, and burner hearth goes out
Mouthful connect with the upper end entrance of described vertical down pass, the smokestack of the raising tangential flow velocity of flue gas be arranged on described in it is vertical under
Between row flue and described vertical updraught flue, high-temperature separator is disposed with described vertical updraught flue, it is described
The outlet upper end of vertical updraught flue is connected with described superheater, described vertical down pass and vertical updraught flue bottom
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 the patent document, after a period of time, high-temperature separator, overheat
Easy dust stratification, causes heat exchange efficiency to be greatly lowered on device, or even loses heat exchange function, causes whole CFBB to contribute
Reduce, efficiency reduces.
Publication No. CN 203147750U, publication date are that the Chinese patent literature of on 08 21st, 2013 discloses one kind
Energy-efficient double speed CFBB, is provided with combustion chamber, heat pipe, blast cap in furnace chamber, combustion chamber connection flue, on flue
Provided with heat exchanger and economizer, it is characterised in that：Combustion chamber is separated into high speed bed combustor and funnel shaped low speed by barrier film
Bed combustor, both communicate upper and lower side, and low speed bed combustor is located at flue side, and blast cap is located at below high speed bed combustor；Cigarette
Air preheater is provided with road, an 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 the patent document, divulged information by an air channel, secondary air duct,
Although the soot particle that part is attached on air preheater can be blown away, but it is difficult to blow in air preheater these heat exchanger components tube bank
The ash of the heart, soot blowing is not thorough, and soot blowing effect is poor, influences heat exchange efficiency, causes small, the efficiency of whole CFBB output
It is low.
The content of the invention
The defects of present invention is in order to overcome above-mentioned prior art, there is provided a kind of process for deashing suitable for fluidized-bed combustion boiler,
The present invention uses sand ash disposal, can effectively remove the ash in tail vertical well on heat exchanger components, increases boiler output, improves effect
Rate.
The present invention is achieved through the following technical solutions：
A kind of process for deashing suitable for fluidized-bed combustion boiler, including sand loading step and recycling step, it is characterised in that：It is described
There is sandblasting step between sand loading step and recycling step, the sand loading step refers to sand being contained in sand soot blower
In sand hopper；The sandblasting step refers to be put into the sand in sand hopper in the sanding machine of sand soot blower, and sanding machine is by sand
Spray into the tail vertical well of fluidized-bed combustion boiler；The sand that the recycling step refers to spray into tail vertical well washes away superheater, saved
It is flow to after coal device and air preheater in the fluid bed of sand soot blower, the auger sand reclamation through being connected on fluid bed.
Sandblasting speed in the sandblasting step is 5-10 Grams Per Seconds.
Sandblasting frequency in the sandblasting step is 3-5 times/hour.
The sand soot blower includes sand hopper, the sanding machine being connected at the top of tail vertical well and is connected to tail vertical well bottom
The fluid bed in portion, sanding machine include buncher, belt pulley, driving belt, blast tube and the bearing being connected on blast tube, sand
Bucket is connected by sand-feeding tube with blast tube, and the motor shaft of buncher is connected with pulley drive, and belt pulley passes through driving belt
It is connected with bearing-transmission, blast tube connects with tail vertical well, is connected with fluid bed by motor-driven auger.
The rotating speed of the buncher is 2000-3000 revs/min.
Air-introduced machine is connected with the top of tail vertical well, blast pipe is connected with air-introduced machine, blast pipe is connected with blast tube.
The blast tube is formed by connecting by the contraction section, cylindrical section and expansion segment that penetrate from top to bottom, contraction section and air intake
Pipe connects.
Rotating disk is provided with the blast tube, rotating disk is rotatablely connected with expansion segment, and rotating disk is by being connected to afterbody
Electric rotating machine on vertical shaft inner roof wall is driven, and multiple blow holes are evenly distributed with rotating disk.
" L " type support is connected with tail vertical well inner roof wall, electric rotating machine is connected on " L " type support.
Through middle siphunculus is connected with the rotating disk, bottom is cased with middle siphunculus, three blast pipes are connected with bottom,
The angle that any two adjacent blast pipes are formed is 15 degree.
Support frame is connected with the outer wall of the sand hopper, support frame is fixed on tail vertical well roof.
Sieve plate is connected with the fluid bed, fluid bed is separated into first class room and under first class room by sieve plate
Second fluidising chamber of side.
Induced-draught fan is provided with the fluid bed, induced-draught fan is connected by aspiration channel with first class room.
The first roots blower and the second roots blower are additionally provided with the fluid bed, the first roots blower is connected to second
The side of fluidising chamber, the second roots blower are connected to the opposite side of the second fluidising chamber.
The auger is formed by connecting by vertical section, segmental arc and tilting section successively.
Dust bag, dust bag and induced-draught fan detachable connection are provided with the induced-draught fan.
Beneficial effects of the present invention are mainly manifested in following aspect：
First, it is of the invention, there is sandblasting step between sand loading step and recycling step, sand loading step refers to sand being contained in
In the sand hopper of sand soot blower；Sandblasting step refers to be put into the sand in sand hopper in the sanding machine of sand soot blower, spray
Sand device sprays into sand in the tail vertical well of fluidized-bed combustion boiler；The sand that recycling step refers to spray into tail vertical well washes away overheat
It is flow to after device, economizer and air preheater in the fluid bed of sand soot blower, the auger sand reclamation through being connected on fluid bed,
Sandblasting is carried out using sand, because sand flows with flue gas, therefore, the heat exchanging part such as superheater, economizer, air preheater
The ash in the tube bank centre of part can also remove, and can effectively increase boiler output, improve efficiency；Sand process for deashing is more existing
The effect of technology steam soot blowing is more preferable, effective, and cost is lower；Due to not producing sound wave or shock wave, thus will not be to people's
Body produces harmful effect, improves safety in utilization.
2nd, of the invention, the sandblasting speed in sandblasting step is 5-10 Grams Per Seconds, can either using the specific sandblasting speed
The dust on superheater, economizer and air preheater these heat exchanger components is effectively washed away, and can enough prevents that sand impulsive force is excessive
Damage superheater, economizer and air preheater these heat exchanger components.
3rd, of the invention, the sandblasting frequency in sandblasting step is 3-5 times/hour, can using the specific sandblasting frequency
The thoroughly effective dust removed on superheater, economizer and air preheater these heat exchanger components, prevents from accumulating, ensures heat exchanger components
Heat exchange efficiency.
4th, of the invention, sand soot blower includes sand hopper, the sanding machine being connected at the top of tail vertical well and is connected to afterbody
The fluid bed of silo bottom, sanding machine include buncher, belt pulley, driving belt, blast tube and are connected on blast tube
Bearing, sand hopper are connected by sand-feeding tube with blast tube, and the motor shaft of buncher is connected with pulley drive, and belt pulley passes through biography
Dynamic belt is connected with bearing-transmission, and blast tube connects with tail vertical well, is connected with by motor-driven auger, makes on fluid bed
Used time, the sand in sand hopper is put into blast tube through sand-feeding tube, the superheater, economizer and sky that sand flows through tail vertical well are pre-
Device, the dust sticked on these heat exchanger components is washed out, it is achieved thereby that soot blowing purpose, the heat exchange for improving heat exchanger components is imitated
Rate；Because sand flows with flue gas, therefore, the tube bank central part of the heat exchanger components such as superheater, economizer, air preheater
The ash of position can also remove, and greatly improve dedusting effect, due to being sand ash disposal, rather than high-temperature steam, combustion gas, sound wave
Deng greatly reducing energy consumption.
5th, of the invention, the rotating speed of buncher is 2000-3000 revs/min, and the sand in sand hopper can be made smoothly to fall into
In blast tube, prevent from blocking in blast tube, beneficial to guarantee sandblasting effect.
6th, of the invention, tail vertical well is connected with air-introduced machine on top, and blast pipe, blast pipe and spray are connected with air-introduced machine
Sandpipe connects, and wind is introduced into blast tube by air-introduced machine, wind speed can drive sand quickly to fall on heat exchanger components, will change
Dust on thermal part is taken away, and improves soot blowing efficiency.
7th, of the invention, blast tube is formed by connecting by the contraction section, cylindrical section and expansion segment that penetrate from top to bottom, contraction section
It is connected with blast pipe, using the blast tube of this Venturi tube structure, the wind speed come out from expansion segment is further enhanced, improved
The spouting velocity of sand, so as to further improve efficiency of dust collection.
8th, it is of the invention, rotating disk is provided with blast tube, rotating disk is rotatablely connected with expansion segment, and rotating disk passes through connection
Electric rotating machine on tail vertical well inner roof wall drives, and is evenly distributed with multiple blow holes in rotating disk, passes through the rotation of rotating disk
Turn, sand is uniformly sprayed on heat exchanger components under the action of the centrifugal force, can be by the dust on heat exchanger components central tube bundle
Largely wash out, improve the heat exchange efficiency of heat exchanger components.
9th, it is of the invention, " L " type support is connected with tail vertical well inner roof wall, electric rotating machine is connected on " L " type support,
By using " L " type support, on the one hand, it is convenient to be fixedly connected with tail vertical well inner roof wall, on the other hand, electric rotating machine can be given
One good support, ensure electric rotating machine job stability.
Tenth, it is of the invention, through middle siphunculus is connected with rotating disk, bottom is cased with middle siphunculus, three are connected with bottom
Blast pipe, the angle that any two adjacent blast pipes are formed is 15 degree, is arranged using the blast pipe of this special angle, can
The spraying range of sand is reduced, can either ensure that sand is capable of the ash washed away on heat exchanger components of large area, and can enough improves sand
The spray rate of son, strengthen soot blowing effect.
11, it is of the invention, support frame is connected with the outer wall of sand hopper, support frame is fixed on tail vertical well roof, support
Frame can give sand hopper good support force, ensure the normal sand loading of sand hopper and shake out.
12, it is of the invention, sieve plate is connected with fluid bed, fluid bed is separated into first class room and positioned at first by sieve plate
The second fluidising chamber below fluidising chamber, sand can be maximumlly sieved into by sieve plate in auger, be easy to the recovery of sand.
13, it is of the invention, induced-draught fan is provided with fluid bed, induced-draught fan is connected by aspiration channel with first class room, is inhaled
Blower fan can siphon away the most of dust being blended in sand, improve the rate of recovery of sand.
14, it is of the invention, the first roots blower and the second roots blower are additionally provided with fluid bed, the first roots blower connects
Be connected on the side of the second fluidising chamber, the second roots blower is connected to the opposite side of the second fluidising chamber, by be correspondingly arranged first
Roots blower and the second roots blower, the small part dust remained in sand can be blown away, ash disposal is more thorough, greatly carries
The high rate of recovery of sand.
15, of the invention, auger is formed by connecting by vertical section, segmental arc and tilting section successively, can prevent sand from twisting
Longli accumulated plugging, beneficial to the recovery speed for improving sand.
16, it is of the invention, dust bag, dust bag and induced-draught fan detachable connection are provided with induced-draught fan, is easy to collect
The dust to get off is cleared up on heat exchanger components, there is good environment protecting.
Brief description of the drawings
The present invention is described in further detail below in conjunction with specification drawings and specific embodiments, wherein：
Fig. 1 is that sand soot blower is arranged on the structural representation on boiler in the embodiment of the present invention 2；
Fig. 2 is that sand soot blower is arranged on the structural representation on boiler in the embodiment of the present invention 5；
Fig. 3 is the structural representation of rotating disk in the embodiment of the present invention 5；
Marked in figure：1st, sand hopper, 2, tail vertical well, 3, superheater, 4, economizer, 5, air preheater, 6, fluid bed, 7, twist
Dragon, 8, buncher, 9, belt pulley, 10, driving belt, 11, blast tube, 12, bearing, 13, sand-feeding tube, 14, motor, 15, draw
Blower fan, 16, blast pipe, 17, rotating disk, 18, electric rotating machine, 19, blow hole, 20, support, 21, middle siphunculus, 22, bottom, 23,
Blast pipe, 24, support frame, 25, sieve plate, 26, first class room, the 27, second fluidising chamber, 28, induced-draught fan, 29, aspiration channel, 30,
First roots blower, the 31, second roots blower, 32, dust bag.
Embodiment
Embodiment 1
Referring to Fig. 1, a kind of process for deashing suitable for fluidized-bed combustion boiler, including sand loading step and recycling step, the dress
There is sandblasting step between sand step and recycling step, the sand loading step refers to the sand that sand is contained in sand soot blower
In bucket 1；The sandblasting step refers to be put into the sand in sand hopper 1 in the sanding machine of sand soot blower, and sanding machine is by sand
Spray into the tail vertical well 2 of fluidized-bed combustion boiler；The recycling step refer to spray into tail vertical well 2 in sand wash away superheater 3,
It is flow to after economizer 4 and air preheater 5 in the fluid bed 6 of sand soot blower, the auger 7 through being connected on fluid bed 6 reclaims sand
Son.
The present embodiment is most basic embodiment, also has sandblasting step, sand loading step between sand loading step and recycling step
Suddenly refer to be contained in sand in the sand hopper of sand soot blower；Sandblasting step refers to the sand in sand hopper being put into sand soot blowing
In the sanding machine of device, sanding machine sprays into sand in the tail vertical well of fluidized-bed combustion boiler；Recycling step refers to that spraying into afterbody erects
Sand in well is flow in the fluid bed of sand soot blower after washing away superheater, economizer and air preheater, through being connected to fluidisation
Auger sand reclamation on bed, sandblasting is carried out using sand, because sand flows with flue gas, therefore, superheater, province
The ash in the tube bank centre of the heat exchanger components such as coal device, air preheater can also remove, and can effectively increase boiler output, improve effect
Rate；Sand process for deashing is more preferable compared with the effect of prior art steam soot blowing, and effective, cost is lower；Due to not producing sound wave
Or shock wave, thus harmful effect will not be produced to the body of people, improve safety in utilization.
Embodiment 2
Referring to Fig. 1, a kind of process for deashing suitable for fluidized-bed combustion boiler, including sand loading step and recycling step, the dress
There is sandblasting step between sand step and recycling step, the sand loading step refers to the sand that sand is contained in sand soot blower
In bucket 1；The sandblasting step refers to be put into the sand in sand hopper 1 in the sanding machine of sand soot blower, and sanding machine is by sand
Spray into the tail vertical well 2 of fluidized-bed combustion boiler；The recycling step refer to spray into tail vertical well 2 in sand wash away superheater 3,
It is flow to after economizer 4 and air preheater 5 in the fluid bed 6 of sand soot blower, the auger 7 through being connected on fluid bed 6 reclaims sand
Son.
Sandblasting speed in the sandblasting step is 5 Grams Per Seconds.
Sandblasting frequency in the sandblasting step is 3 times/hour.
The sand soot blower includes sand hopper 1, the sanding machine for being connected to the top of tail vertical well 2 and is connected to tail vertical well
The fluid bed 6 of 2 bottoms, sanding machine include buncher 8, belt pulley 9, driving belt 10, blast tube 11 and are connected to blast tube
Bearing 12 on 11, sand hopper 1 are connected by sand-feeding tube 13 with blast tube 11, and motor shaft and the transmission of belt pulley 9 of buncher 8 connect
Connect, belt pulley 9 is connected by driving belt 10 and bearing 12, and blast tube 11 connects with tail vertical well 2, is connected on fluid bed 6
It is connected to the auger 7 driven by motor 14.
The rotating speed of the buncher 8 is 2000 revs/min.
The present embodiment is a better embodiment, and sand soot blower includes sand hopper, the spray being connected at the top of tail vertical well
Sand device and the fluid bed for being connected to tail vertical well bottom, sanding machine include buncher, belt pulley, driving belt, blast tube and
The bearing being connected on blast tube, sand hopper are connected by sand-feeding tube with blast tube, the motor shaft and pulley drive of buncher
Connection, belt pulley are connected by driving belt with bearing-transmission, and blast tube connects with tail vertical well, is connected with and passes through on fluid bed
Motor-driven auger, in use, the sand in sand hopper is put into blast tube through sand-feeding tube, sand flows through the mistake of tail vertical well
Hot device, economizer and air preheater, the dust sticked on these heat exchanger components is washed out, it is achieved thereby that soot blowing purpose, is improved
The heat exchange efficiency of heat exchanger components；Because sand flows with flue gas, therefore, the heat exchange such as superheater, economizer, air preheater
The ash in the tube bank centre of part can also remove, and greatly improve dedusting effect, due 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 for fluidized-bed combustion boiler, including sand loading step and recycling step, the dress
There is sandblasting step between sand step and recycling step, the sand loading step refers to the sand that sand is contained in sand soot blower
In bucket 1；The sandblasting step refers to be put into the sand in sand hopper 1 in the sanding machine of sand soot blower, and sanding machine is by sand
Spray into the tail vertical well 2 of fluidized-bed combustion boiler；The recycling step refer to spray into tail vertical well 2 in sand wash away superheater 3,
It is flow to after economizer 4 and air preheater 5 in the fluid bed 6 of sand soot blower, the auger 7 through being connected on fluid bed 6 reclaims sand
Son.
Sandblasting speed in the sandblasting step is 6 Grams Per Seconds.
Sandblasting frequency in the sandblasting step is 4 times/hour.
The sand soot blower includes sand hopper 1, the sanding machine for being connected to the top of tail vertical well 2 and is connected to tail vertical well
The fluid bed 6 of 2 bottoms, sanding machine include buncher 8, belt pulley 9, driving belt 10, blast tube 11 and are connected to blast tube
Bearing 12 on 11, sand hopper 1 are connected by sand-feeding tube 13 with blast tube 11, and motor shaft and the transmission of belt pulley 9 of buncher 8 connect
Connect, belt pulley 9 is connected by driving belt 10 and bearing 12, and blast tube 11 connects with tail vertical well 2, is connected on fluid bed 6
It is connected to the auger 7 driven by motor 14.
The rotating speed of the buncher 8 is 2200 revs/min.
Tail vertical well 2 is connected with air-introduced machine 15 on top, and blast pipe 16, blast pipe 16 and sandblasting are connected with air-introduced machine 15
Pipe 11 connects.
The blast tube 11 is formed by connecting by the contraction section, cylindrical section and expansion segment that penetrate from top to bottom, and contraction section is with entering
Airduct 16 connects.
Rotating disk 17 is provided with the blast tube 11, rotating disk 17 is rotatablely connected with expansion segment, and rotating disk 17 passes through company
The electric rotating machine 18 being connected on the inner roof wall of tail vertical well 2 is driven, and multiple blow holes 19 are evenly distributed with rotating disk 17.
" L " type support 20 is connected with the inner roof wall of tail vertical well 2, electric rotating machine 18 is connected on " L " type support 20.
The present embodiment is another better embodiment, and tail vertical well is connected with air-introduced machine on top, is connected with air-introduced machine
Blast pipe, blast pipe are connected with blast tube, wind are introduced into blast tube by air-introduced machine, wind speed can drive sand quickly to fall
Onto heat exchanger components, the dust on heat exchanger components is taken away, improves soot blowing efficiency.The blast tube contraction by penetrating from top to bottom
Section, cylindrical section and expansion segment are formed by connecting, and contraction section is connected with blast pipe, using the blast tube of this Venturi tube structure, from expansion
Open the wind speed that section comes out to be further enhanced, improve the spouting velocity of sand, so as to further improve efficiency of dust collection.Blast tube
On be provided with rotating disk, rotating disk is rotatablely connected with expansion segment, and rotating disk passes through the rotation that is connected on tail vertical well inner roof wall
Motor is driven, and multiple blow holes are evenly distributed with rotating disk, equal under the action of the centrifugal force by the rotation of rotating disk, sand
Even is sprayed on heat exchanger components, can largely wash out the dust on heat exchanger components central tube bundle, improve heat exchanger components
Heat exchange efficiency." L " type support is connected with tail vertical well inner roof wall, electric rotating machine is connected on " L " type support, by using
" L " type support, on the one hand, it is convenient to be fixedly connected with tail vertical well inner roof wall, on the other hand, electric rotating machine one can be given good
Support, ensure electric rotating machine job stability.
Embodiment 4
Referring to Fig. 2 and Fig. 3, a kind of process for deashing suitable for fluidized-bed combustion boiler, including sand loading step and recycling step, institute
State and also have sandblasting step between sand loading step and recycling step, the sand loading step refers to sand being contained in sand soot blower
Sand hopper 1 in；The sandblasting step refers to be put into the sand in sand hopper 1 in the sanding machine of sand soot blower, and sanding machine will
Sand is sprayed into the tail vertical well 2 of fluidized-bed combustion boiler；The sand that the recycling step refers to spray into tail vertical well 2 washes away overheat
It is flow to after device 3, economizer 4 and air preheater 5 in the fluid bed 6 of sand soot blower, the auger 7 through being connected on fluid bed 6 returns
Receive sand.
Sandblasting speed in the sandblasting step is 8 Grams Per Seconds.
Sandblasting frequency in the sandblasting step is 4 times/hour.
The sand soot blower includes sand hopper 1, the sanding machine for being connected to the top of tail vertical well 2 and is connected to tail vertical well
The fluid bed 6 of 2 bottoms, sanding machine include buncher 8, belt pulley 9, driving belt 10, blast tube 11 and are connected to blast tube
Bearing 12 on 11, sand hopper 1 are connected by sand-feeding tube 13 with blast tube 11, and motor shaft and the transmission of belt pulley 9 of buncher 8 connect
Connect, belt pulley 9 is connected by driving belt 10 and bearing 12, and blast tube 11 connects with tail vertical well 2, is connected on fluid bed 6
It is connected to the auger 7 driven by motor 14.
The rotating speed of the buncher 8 is 2500 revs/min.
Tail vertical well 2 is connected with air-introduced machine 15 on top, and blast pipe 16, blast pipe 16 and sandblasting are connected with air-introduced machine 15
Pipe 11 connects.
The blast tube 11 is formed by connecting by the contraction section, cylindrical section and expansion segment that penetrate from top to bottom, and contraction section is with entering
Airduct 16 connects.
Rotating disk 17 is provided with the blast tube 11, rotating disk 17 is rotatablely connected with expansion segment, and rotating disk 17 passes through company
The electric rotating machine 18 being connected on the inner roof wall of tail vertical well 2 is driven, and multiple blow holes 19 are evenly distributed with rotating disk 17.
" L " type support 20 is connected with the inner roof wall of tail vertical well 2, electric rotating machine 18 is connected on " L " type support 20.
Through middle siphunculus 21 is connected with the rotating disk 17, bottom 22 is cased with middle siphunculus 21, is connected with bottom 22
Three blast pipes 23, the angle that any two adjacent blast pipes 23 are formed is 15 degree.
Support frame 24 is connected with the outer wall of the sand hopper 1, support frame 24 is fixed on the roof of tail vertical well 2.
The present embodiment is another better embodiment, runs through in rotating disk and is connected with middle siphunculus, bottom is cased with middle siphunculus,
Three blast pipes are connected with bottom, the angle that any two adjacent blast pipes are formed is 15 degree, using this special angle
Blast pipe arrangement, the spraying range of sand can be reduced, can either ensure that sand is capable of the washing away on heat exchanger components of large area
Ash, and can enough improves the spray rate of sand, strengthens soot blowing effect.Support frame is connected with the outer wall of sand hopper, support frame is solid
It is scheduled on tail vertical well roof, support frame can give sand hopper good support force, ensure the normal sand loading of sand hopper and shake out.
Embodiment 5
Referring to Fig. 2 and Fig. 3, a kind of process for deashing suitable for fluidized-bed combustion boiler, including sand loading step and recycling step, institute
State and also have sandblasting step between sand loading step and recycling step, the sand loading step refers to sand being contained in sand soot blower
Sand hopper 1 in；The sandblasting step refers to be put into the sand in sand hopper 1 in the sanding machine of sand soot blower, and sanding machine will
Sand is sprayed into the tail vertical well 2 of fluidized-bed combustion boiler；The sand that the recycling step refers to spray into tail vertical well 2 washes away overheat
It is flow to after device 3, economizer 4 and air preheater 5 in the fluid bed 6 of sand soot blower, the auger 7 through being connected on fluid bed 6 returns
Receive sand.
Sandblasting speed in the sandblasting step is 10 Grams Per Seconds.
Sandblasting frequency in the sandblasting step is 5 times/hour.
The sand soot blower includes sand hopper 1, the sanding machine for being connected to the top of tail vertical well 2 and is connected to tail vertical well
The fluid bed 6 of 2 bottoms, sanding machine include buncher 8, belt pulley 9, driving belt 10, blast tube 11 and are connected to blast tube
Bearing 12 on 11, sand hopper 1 are connected by sand-feeding tube 13 with blast tube 11, and motor shaft and the transmission of belt pulley 9 of buncher 8 connect
Connect, belt pulley 9 is connected by driving belt 10 and bearing 12, and blast tube 11 connects with tail vertical well 2, is connected on fluid bed 6
It is connected to the auger 7 driven by motor 14.
The rotating speed of the buncher 8 is 3000 revs/min.
Tail vertical well 2 is connected with air-introduced machine 15 on top, and blast pipe 16, blast pipe 16 and sandblasting are connected with air-introduced machine 15
Pipe 11 connects.
The blast tube 11 is formed by connecting by the contraction section, cylindrical section and expansion segment that penetrate from top to bottom, and contraction section is with entering
Airduct 16 connects.
Rotating disk 17 is provided with the blast tube 11, rotating disk 17 is rotatablely connected with expansion segment, and rotating disk 17 passes through company
The electric rotating machine 18 being connected on the inner roof wall of tail vertical well 2 is driven, and multiple blow holes 19 are evenly distributed with rotating disk 17.
" L " type support 20 is connected with the inner roof wall of tail vertical well 2, electric rotating machine 18 is connected on " L " type support 20.
Through middle siphunculus 21 is connected with the rotating disk 17, bottom 22 is cased with middle siphunculus 21, is connected with bottom 22
Three blast pipes 23, the angle that any two adjacent blast pipes 23 are formed is 15 degree.
Support frame 24 is connected with the outer wall of the sand hopper 1, support frame 24 is fixed on the roof of tail vertical well 2.
Sieve plate 25 is connected with the fluid bed 6, fluid bed 6 is separated into first class room 26 and positioned at first by sieve plate 25
Second fluidising chamber 27 of the lower section of fluidising chamber 26.
Induced-draught fan 28 is provided with the fluid bed 6, induced-draught fan 28 is connected by aspiration channel 29 with first class room 26.
The first roots blower 30 and the second roots blower 31 are additionally provided with the fluid bed 6, the first roots blower 30 connects
The side of the second fluidising chamber 27 is connected on, the second roots blower 31 is connected to the opposite side of the second fluidising chamber 27.
The auger 7 is formed by connecting by vertical section, segmental arc and tilting section successively.
Dust bag 32, dust bag 32 and the detachable connection of induced-draught fan 28 are provided with the induced-draught fan 28.
The present embodiment is preferred forms, and sieve plate is connected with fluid bed, and fluid bed is separated into first class by sieve plate
Sand, can be maximumlly sieved into auger, is easy to by room and the second fluidising chamber below first class room by sieve plate
The recovery of sand.Induced-draught fan is provided with fluid bed, induced-draught fan is connected by aspiration channel with first class room, and induced-draught fan can incite somebody to action
The most of dust being blended in sand siphons away, and improves the rate of recovery of sand.Be additionally provided with fluid bed the first roots blower and
Second roots blower, the first roots blower are connected to the side of the second fluidising chamber, and the second roots blower is connected to the second fluidising chamber
Opposite side, by the first roots blower and the second roots blower being correspondingly arranged, the small part that will can be remained in sand
Dust is blown away, and ash disposal is more thorough, greatly improves the rate of recovery of sand.
Auger is formed by connecting by vertical section, segmental arc and tilting section successively, can prevent sand accumulated plugging in auger,
Beneficial to the recovery speed for improving sand.Dust bag, dust bag and induced-draught fan detachable connection are provided with induced-draught fan, is easy to receive
The dust to get off is cleared up on collection heat exchanger components, there is good environment protecting.
Claims (10)
1. a kind of process for deashing suitable for fluidized-bed combustion boiler, including sand loading step and recycling step, it is characterised in that：The dress
There is sandblasting step between sand step and recycling step, the sand loading step refers to the sand that sand is contained in sand soot blower
Bucket（1）In；The sandblasting step refers to sand hopper（1）In sand be put into the sanding machine of sand soot blower, sanding machine will
Sand sprays into the tail vertical well of fluidized-bed combustion boiler（2）It is interior；The recycling step refers to spray into tail vertical well（2）Interior sand washes away
Superheater（3）, economizer（4）And air preheater（5）The fluid bed of sand soot blower is flow to afterwards（6）It is interior, through being connected to fluid bed
（6）On auger（7）Sand reclamation；The sand soot blower includes sand hopper（1）, be connected to tail vertical well（2）The spray at top
Sand device and it is connected to tail vertical well（2）The fluid bed of bottom（6）, sanding machine includes buncher（8）, belt pulley（9）, transmission skin
Band（10）, blast tube（11）Be connected to blast tube（11）On bearing（12）, sand hopper（1）Pass through sand-feeding tube（13）With blast tube
（11）Connection, buncher（8）Motor shaft and belt pulley（9）Drive connection, belt pulley（9）Pass through driving belt（10）With axle
Hold（12）Drive connection, blast tube（11）With tail vertical well（2）Connection, fluid bed（6）On be connected with and pass through motor（14）Driving
Auger（7）；Tail vertical well（2）Air-introduced machine is connected with top（15）, air-introduced machine（15）On be connected with blast pipe（16）, air intake
Pipe（16）With blast tube（11）Connection；The blast tube（11）Connected from top to bottom by the contraction section, cylindrical section and expansion segment that penetrate
Connect and form, contraction section and blast pipe（16）Connection；The blast tube（11）On be provided with rotating disk（17）, rotating disk（17）With expansion
Open section rotation connection, rotating disk（17）By being connected to tail vertical well（2）Electric rotating machine on inner roof wall（18）Driving, rotating disk
（17）On be evenly distributed with multiple blow holes（19）；Tail vertical well（2）" L " type support is connected with inner roof wall（20）, electric rotating
Machine（18）It is connected to " L " type support（20）On；The rotating disk（17）Above run through and be connected with middle siphunculus（21）, middle siphunculus（21）On
It is cased with bottom（22）, bottom（22）On be connected with three blast pipes（23）, any two adjacent blast pipes（23）The folder formed
Angle is 15 degree.
A kind of 2. process for deashing suitable for fluidized-bed combustion boiler according to claim 1, it is characterised in that：The sandblasting step
Sandblasting speed in rapid is 5-10 Grams Per Seconds.
A kind of 3. process for deashing suitable for fluidized-bed combustion boiler according to claim 1, it is characterised in that：The sandblasting step
Sandblasting frequency in rapid is 3-5 times/hour.
A kind of 4. process for deashing suitable for fluidized-bed combustion boiler according to claim 1, it is characterised in that：The speed governing electricity
Machine（8）Rotating speed be 2000-3000 revs/min.
A kind of 5. process for deashing suitable for fluidized-bed combustion boiler according to claim 4, it is characterised in that：The sand hopper
（1）Outer wall on be connected with support frame（24）, support frame（24）It is fixed on tail vertical well（2）On roof.
A kind of 6. process for deashing suitable for fluidized-bed combustion boiler according to claim 5, it is characterised in that：The fluid bed
（6）Inside it is connected with sieve plate（25）, sieve plate（25）By fluid bed（6）It is separated into first class room（26）With positioned at first class room
（26）Second fluidising chamber of lower section（27）.
A kind of 7. process for deashing suitable for fluidized-bed combustion boiler according to claim 6, it is characterised in that：The fluid bed
（6）On be provided with induced-draught fan（28）, induced-draught fan（28）Pass through aspiration channel（29）With first class room（26）Connection.
A kind of 8. process for deashing suitable for fluidized-bed combustion boiler according to claim 7, it is characterised in that：The fluid bed
（6）On be additionally provided with the first roots blower（30）With the second roots blower（31）, the first roots blower（30）It is connected to second
Change room（27）Side, the second roots blower（31）It is connected to the second fluidising chamber（27）Opposite side.
A kind of 9. process for deashing suitable for fluidized-bed combustion boiler according to claim 8, it is characterised in that：The auger
（7）It is formed by connecting successively by vertical section, segmental arc and tilting section.
A kind of 10. process for deashing suitable for fluidized-bed combustion boiler according to claim 9, it is characterised in that：The air draught
Machine（28）On be provided with dust bag（32）, dust bag（32）With induced-draught fan（28）Detachable connection.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107461749B (en) * | 2017-08-10 | 2019-02-05 | 清华大学 | A kind of material circulating system |
| CN107327850B (en) * | 2017-08-10 | 2023-03-14 | 北京衡燃科技有限公司 | Double-circulation turbulent bed incinerator with ash sprayer |
| CN107314379B (en) * | 2017-08-10 | 2019-02-22 | 清华大学 | A kind of Two-way Cycle turbulent bed incinerator with sand blasting unit |
| 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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