CN110030573A - A kind of system for preventing rotary regenerative air preheater dust stratification from staiing - Google Patents
A kind of system for preventing rotary regenerative air preheater dust stratification from staiing Download PDFInfo
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- CN110030573A CN110030573A CN201910382001.XA CN201910382001A CN110030573A CN 110030573 A CN110030573 A CN 110030573A CN 201910382001 A CN201910382001 A CN 201910382001A CN 110030573 A CN110030573 A CN 110030573A
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- 239000000428 dust Substances 0.000 title claims abstract description 26
- 238000013517 stratification Methods 0.000 title claims abstract description 24
- 230000001172 regenerating effect Effects 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 73
- 239000003546 flue gas Substances 0.000 claims abstract description 55
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000005192 partition Methods 0.000 claims abstract description 32
- 239000000284 extract Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims description 2
- 239000003245 coal Substances 0.000 description 17
- 239000000446 fuel Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 238000002360 preparation method Methods 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000000151 deposition Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 9
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 8
- 230000008021 deposition Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000013459 approach Methods 0.000 description 6
- 238000011109 contamination Methods 0.000 description 6
- 238000004064 recycling Methods 0.000 description 6
- 239000004071 soot Substances 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 239000003517 fume Substances 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- 108010066114 cabin-2 Proteins 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 210000003298 dental enamel Anatomy 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 230000001535 kindling effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/02—Arrangements of regenerators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a kind of systems for preventing rotary regenerative air preheater dust stratification from staiing, flue gas point storehouse is formed with including inside, the air preheater of a wind separating bin and secondary air separating storehouse, it is isolated between the flue gas Fen Cang and a wind separating bin by first partition, the flue gas divides between storehouse and secondary air separating storehouse and is isolated by second partition, heating wind cabin is separated out by third partition in the secondary air separating storehouse, it is characterized by: being located at the first partition in air preheater hot end and/or second partition is equipped with and radially leaks out the aspirating hole that gap is connected to air preheater hot end, the aspirating hole by leak out extract out pipeline with heat wind cabin wind inlet channel be connected to, heating wind cabin exhaust air flue is connected to negative-pressure air fan；Wherein, one end that the heating wind cabin is located at air preheater hot end is air intake, is outlet air end positioned at one end of air preheater cold-end air.The present invention can solve traditional rotary regenerative air preheater dust stratification and stain and leak the problem of wind cannot make full use of.
Description
Technical field
The invention belongs to boiler air preheater technical fields more particularly to one kind to prevent rotary regenerative air preheater dust stratification
The system of contamination.
Background technique
Rotary regenerative air preheater is widely used in large-sized station boiler, is added using the heat of boiler combustion flue gas
Air needed for hot fuel combustion has the function of improving efficiency of combustion, recycling smoke discharging residual heat.The rotary sky of large-sized station boiler
Air preheater generallys use San Fencang, four points of chamber structure designs, i.e., rotor through flow section is divided into flue gas Fen Cang, a wind separating bin
With secondary air separating storehouse, different fluids divides between storehouse, carries out in the fanning strip that certain angle is radially respectively adopted in hot end and cold end
Separate.
Leaking out is outstanding problem present in air preheater operation, including is directly leaked out and carrying is leaked out.Wherein, due to
Air preheater internal air pressure is higher than flue gas pressures, and caused air is leaked to fume side, referred to as directly leaked out；Due to sky
The rotation of air preheater rotor carries air to fume side, referred to as carries and leak out.Direct inleakage and seal clearance and fluid pressure
Difference is related, and gap, pressure difference are bigger, and direct inleakage is bigger；It is related with rotor volumes and revolving speed to carry inleakage, air preheater
After structure determination, carries inleakage and determine substantially.
In rotary regenerative air preheater operation, due to hot end element colder side component temperature height, rotor expansion amount is big, causes
" mushroom " deformation occurs for rotor, the triangle of rotor cold end leak out gap and rotor circumference direction the axial direction gap-ratio that leaks out it is cold
It is small when state, and hot end of rotor leak out gap-ratio cold conditions when it is big.Therefore, in each stock leaks out, hot end of rotor leaks out proportion
It is maximum.Under unit rated loan condition, it is at this time by hot end diameter there are about 60% or more inleakage that rotor deformation, which reaches maximum,
To clearance leakage of leaking out.
Hot end is leaked out and cold end is leaked out difference, and what it is due to its leakage is the high temperature air having been warmed up, this partial air with
Ventilating air preheater rotor again after flue gas mixing, causes air preheater heat exchange efficiency to decline, and boiler exhaust gas loss increases,
Unit blower consumption rate increases.Effectively control air-heater leakage, especially hot end is leaked out, and is become each producer's research and is improved
Emphasis.Wherein, flexible sealing technology there are structural member abrasion, reliability is low the problems such as, be not widely recognized as in the industry always；Leakage
Wind control system (LCS) is influenced by the bad working environments such as high temperature, dust, the factors such as repair quality and management level, and put into operation failure rate
It is usually higher.
In terms of reducing diaphragm seal two sides pressure difference, currently generally use that double containment, (i.e. fanning strip at least covers three Seal Designs
Lid twice or three seals, angle are twice or three times of rotor storehouse lattice angle), seal area angle increases, and participates in heat exchange
Divide storehouse angle to reduce, under the premise of guaranteeing heat exchange amount, heat exchange efficiency and circulating resistance, air preheater volume certainly will be increased,
Equipment investment cost is caused to increase.
Another outstanding problem present in rotary regenerative air preheater operation is that it is heavy that the dust stratification of internal heat accumulating element stains
Product.The combustion product of fossil fuel generally comprises sulfur trioxide (SO3) and vapor (H2Both O), SO3In conjunction with vapor, when
(the heat accumulating element metal wall surface temperature filled inside air preheater when flue gas is cooled to sufficient degree inside air preheater
Lower than sulfuric acid vapor dew point when), it will be condensed into liquid sulfuric acid (H2SO4), the strong corrosion to metal heat accumulating element is formed,
Meanwhile the fly ash granule in flue gas is adhered to heat accumulating element surface, leads to fouling, since gas flow channel sectional area is reduced,
Leading to the heat transfer efficiency of air preheater reduces, and flow resistance increases, and blower power consumption increases, and seriously affects the safety and warp of boiler
Ji operation.
Using the station boiler of SCR gas denitrifying technology, on the one hand due to the effect of catalyst, by part SO2It is oxidized to
SO3, on the other hand due to NH in flue gas3/ NO molar ratio, the non-uniform influence of flue gas flow field equal distribution, the flue gas in catalyst downstream
In inevitably there is the unreacted reducing agent NH that escapes on a small quantity3, and with the SO in flue gas3、H2The component reactions such as O generate sulphur
Sour hydrogen ammonium (ABS), the substance start to condense within the scope of about 150-200 DEG C of temperature range, are normally at traditional station boiler
In the middle-temperature section bottom and low temperature segment limit of air preheater, since the substance has stronger viscosity, made to adhere to flying dust
At blocking.
Studies have shown that the dust stratification generated by ABS, usually becomes apparent at heat accumulating element layering.Meanwhile cold end accumulation of heat member
Part is generally possible to effectively remove by way of regular steam soot blowing using closing template, surface deposits；Also, its surface passes through
The processing of plating enamel technology is crossed, finish is higher, and anticorrosion and Soot Performance hotter side and medium temperature segment element are more preferable.To sum up, empty
The region of air preheater heat accumulating element ABS corrosion dust stratification greatest risk is present in the bottom section of middle-temperature section heat accumulating element.
Ammonium hydrogen sulfate (ABS) and sulfuric acid vapor (H2SO4) the corrosion dust stratification that generates, range and degree are produced with gas component
The concentration and dew-point temperature and heat accumulating element of object are related with the Temperature Distribution of rotor direction of rotation along gas flow direction.Change
The section of sedimentation products is limited in cold end under the conditions of varying environment temperature, unit load by the Temperature Distribution for becoming internal rotor
It in range of components, can be effectively removed by means such as soot blowings, its influence to unit operation is reduced to minimum.
The ammonium hydrogen sulfate (ABS) of air preheater heat accumulating element surface deposition, more than dew-point temperature, it may occur that phase transformation gas
Change periodically increases heat accumulating element surface temperature, so that sedimentation products be made to decompose and be carried by air-flow removing " hot clear
Wash " method, help to prevent dust stratification trend growth.
201820677908.X discloses a kind of station boiler rotary regenerative air preheater for preventing dust stratification from staiing deposition,
Circulating-heating point storehouse is separated out by partition in secondary air separating storehouse, then by corresponding pipeline system design and arrangement, in rotor
The lower operating condition of fouling potential shunts part boiler First air/Secondary Air air flow rate, using the counterflow heat exchange of itself and flue gas,
Reduce exhaust gas temperature；When rotor fouling potential increases, the co-current flow of circulating-heating wind cabin internal flow and flue gas is realized, from
The heat absorption of high temperature segment element is most difficult to remove the rotor elements heat release in region to middle-temperature section bottom and low-temperature zone dust stratification, effectively improves it
Temperature levels, so substantially reduce dust stratification contamination deposition, but above-mentioned patent still have leak out and leak wind cannot be very
The problem of good utilisation.
Summary of the invention
The application solves one of the technical problems existing in the prior art between being intended to.For this purpose, an object of the present invention
It is to provide a kind of system for preventing rotary regenerative air preheater dust stratification from staiing, to solve traditional rotary regenerative air preheater dust stratification
Stain and leak the problem of wind cannot make full use of.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of system for preventing rotary regenerative air preheater dust stratification from staiing, including inside are formed with flue gas point storehouse, First air
The air preheater for dividing storehouse and secondary air separating storehouse passes through first partition and is isolated between the flue gas Fen Cang and a wind separating bin, institute
It states and is isolated between flue gas point storehouse and secondary air separating storehouse by second partition, is separated out in the secondary air separating storehouse by third partition
Wind cabin is heated, the first partition and/or second partition positioned at air preheater hot end are equipped with and air preheater hot end
Radial direction leak out gap connection aspirating hole, the aspirating hole by leak out extract out pipeline with heat wind cabin wind inlet channel be connected to, add
Hot wind storehouse exhaust air flue is connected to negative-pressure air fan；Wherein, the heating wind cabin is located at the one end in air preheater hot end for air inlet
End is outlet air end positioned at one end of air preheater cold-end air.
Further, the outlet end of the negative-pressure air fan is respectively connected to by the first contact pipeline and the second contact pipeline
It is set respectively on wind separating bin exhaust air flue and secondary air separating storehouse exhaust air flue, the first contact pipeline and the second contact pipeline
It is equipped with the first control valve and the second control valve, described leak out extracts pipeline out equipped with third control valve.
Further, the first contact pipeline and the second contact pipeline are by having first flow detection device and air duct
The contact general pipeline of heater is connected to the negative-pressure air fan, in the heating wind cabin exhaust air flue at heating wind cabin outlet air end
Equipped with second flow detection device.
Further, the contact general pipeline between the first flow detection device and duct insert heater passes through with the
4th service channel of six control valves is connected to the heating wind cabin wind inlet channel.
Further, fourth service channel and the leak out pumping of the second contact pipeline by the 7th control valve of band
Pipeline is connected to out.
Further, be additionally provided with dust-extraction unit in the heating wind cabin exhaust air flue, the input end of the negative-pressure air fan and
Outlet end is respectively equipped with the 4th control valve and the 5th control valve.
Further, the system also includes the pressure difference for leaking out and extracting out between pipeline and flue gas point storehouse inlet flue duct is arranged in
Measuring instrument.
Further, the first partition, second partition and third partition are fanning strip, and the aspirating hole is along the fan
Shape plate is radial in a row uniformly distributed.
Further, the outlet end of the negative-pressure air fan is successively connected by the 5th service channel with the 8th control valve
It is connected to deduster and air-introduced machine, flue gas point storehouse exhaust pass is connected to the deduster, and the wind pipe of the air-introduced machine passes through
The 6th service channel equipped with the 9th control valve is connected to the heating wind cabin exhaust air flue, is arranged on the second contact pipeline
Oxygen concentration measuring point.
Further, it is described heating wind cabin exhaust air flue by be equipped with the tenth control valve the 7th service channel with it is described
5th service channel connection, secondary air separating storehouse wind inlet channel by with the 11st control valve the 8th service channel with it is described
Heat the connection of wind cabin exhaust air flue.
Compared with prior art, the beneficial effects of the present invention are:
1, in the present invention, air preheater hot end one time, wind cabin, secondary wind cabin and flue gas divide the fanning strip top between storehouse
Portion's aperture connects the suction channel that leaks out；Independent heating wind cabin is set in secondary wind cabin, increase negative-pressure air fan and is connected accordingly
It gives a dinner for a visitor from afar, by the driving of negative-pressure air fan or air side and fume side pressure head, hot end is leaked out and is taken out from fanning strip top drilling
Out, the suction channel that leaked out confluence enters heating wind cabin from hot end, forms forward flowing from hot end to cold end with flue gas, is situated between
After matter absorbs the accumulation of heat of hot end element, fluid temperature (F.T.) is increased, and is had by heat convection to middle-temperature section and cold end heat accumulating element heat release
Effect improves air preheater dust stratification and stains the component temperature for being most difficult to remove region (middle-temperature section bottom), makes it higher than ammonium hydrogen sulfate
(ABS) dew-point temperature of condensable product, plays the role of preventing dust stratification from staiing deposition and in the flue gases such as sulfuric acid vapor.After heat release
Medium flowed out by heating wind cabin cold end, remove the fly ash granule that carries in medium through dust-extraction unit, promoted and pressed by negative-pressure air fan
Head enters deduster gas approach via connecting pipe or air preheater goes out further according to application and system condition requirement
Wind separating bin exhaust air flue of mouth or air preheater secondary air separating storehouse exhaust air flue or partial recirculation to heating wind cabin enter
Mouthful, form open flow or closed cycle flowing.
2, divide the fanning strip top drilling between storehouse, the number of openings and diameter in hot end First air, secondary air separating storehouse and flue gas
Equal to directional element frame quantity, perforated area and pattern are determining through air preheater manufacturing firm strength accounting, and hot end is leaked out
It is drawn by fanning strip tapping suction channel, is equipped with flow control valve in each suction branch and general pipeline of leaking out.
3, the rotary regenerative air preheater flue gas and the single counterflow heat exchange pattern of air for changing traditional design, in former air point
Inside storehouse, individual rotor is sealed off out with fanning strip and heats wind cabin, wind cabin internal flow can be realized and flow of flue gas direction
The switching of fair current/adverse current.
4, main pipe and heating wind by corresponding pipeline system design and arrangement, after suction channel confluence that hot end is leaked out
Storehouse hot side inlet is connected, and heating wind cabin cold side outlet is connected with the negative-pressure air fan entrance of setting, negative-pressure air fan suction or
Between fluid under differential pressure action, hot end, which is leaked out, enters heating wind cabin from top, forms the stream with flue gas forward from hot end to cold end
It is dynamic, compared with scheme flow from cold end to hot end, can be realized to medium temperature end bottom corrode dust stratification greatest risk region more substantially
Heating effect is spent, while guaranteeing that cold end component temperature is higher than acid dew point and medium temperature end base member temperature is higher than ammonium hydrogen sulfate
(ABS) dew-point temperature, so that ABS is made all to be deposited on the cold end element layer in big channel, closing template and surface plating enamel, it can be with
It is control effectively by modes such as soot blowings to product deposition rate is stain.
5, negative-pressure air fan exports hot wind, according to different unit operating condition, burning coal and investment for trnasforming urban land, may be selected not
Same recycling approach: 1. introducing deduster, and since deduster entrance is negative pressure, the total pressure of negative-pressure air fan rises and power is lower；②
Introduce the secondary wind cabin wind pipe of air preheater outlet heat, a part as fuel combustion air；Or introduce air preheat
Wind cabin wind pipe of device, the medium as pulverized coal preparation system drying and conveying fuel.At this point, negative-pressure air fan outlet air enters
Boiler furnace participates in burning and is used, so that flowing through wind separating bin of air preheater, the air mass flow in secondary air separating storehouse subtracts
Small, air/smoke heat capacity ratio reduces, and temperature of rotor is horizontal further to be promoted.
6, enough on former First air/increased influence of secondary air system resistance, and guarantee to reduce setting heating wind cabin
Temperature of rotor promotes effect, and heating wind cabin ostensible angle should be as small as possible, and wind cabin internal flow flow velocity, fluid inlet temperature should be protected
Card is more than certain threshold value, to guarantee necessary heat transfer coefficient and heat transfer effect, in heating wind cabin cold end exhaust air flue, and configuration
Velocity of medium/flow measurement device, to the monitoring and adjustment foundation to heating wind cabin interior fluid mediums flow velocity；It is heating
On the wind inlet channel of wind cabin hot end, the temperature measuring devices such as thermal resistance/thermocouple are configured with, to the fluid for entering heating wind cabin
Temperature is monitored and is adjusted foundation.
7, it to guarantee necessary velocity of medium inside heating wind cabin, is provided in negative-pressure air fan outlet to heating wind cabin air inlet
The recycling contact pipeline in air duct and corresponding flow regulator, guarantee under different operating conditions, heat wind cabin inner fluid streams
Speed is more than threshold value；To adapt to the air preheater accumulatingdust contamination requirements under different coals quality and loading condiction, in negative-pressure air fan
It is provided in outlet using steam heating/electrically heated heater, to guarantee to the temperature levels of heating wind cabin recycling hot wind,
And it in performing low-load running of machine set operating condition, low volatile colm operating condition, improves to hot secondary air bellow air themperature；?
When unit uses the high-moistures coal such as lignite, improve to air preheater outlet heat primary air main pipe air themperature, to guarantee to make
The necessary drying capacity of powder system.
8, unit heavy-duty service, use low-sulfur coal, SCR denitration system the escaping of ammonia rate it is lower when, rotor product
Ash tendency is smaller, which can switch to energy-saving mode operation: 1. passing through the connection of setting heating wind cabin cold side outlet to deduster
Network pipeline and control valve do not start negative-pressure air fan in the slight situation of air preheater fouling potential, and hot end of rotor leaks out
Under pressure differential, being entered by heating wind cabin hot end, the flowing of the direction Xiang Lengduan enters the gas approach of deduster through getting in touch with pipeline,
On the basis of guaranteeing that accumulatingdust stains effect, reduce influence of the negative-pressure air fan power consumption to units consumption；2. passing through setting heat
End, cold end supply air duct (secondary air passage) connect the contact air duct in air duct with heating wind cabin hot end, cold end, can be pre- in air
Hot device realizes circulating-heating wind cabin shunting part boiler air-supply (Secondary Air), and make itself and flue gas stream without under fouling potential operating condition
To being in counterflow heat exchange, to reduce air preheater outlet flue-gas temperature, boiler afterheat recovery utilization rate and unit efficiency are improved.
9, when unit uses the higher fuel of the index of expolsibility such as high-volatile coal, pulverized coal preparation system entrance medium is oxygen-containing
Amount should be lower than certain threshold value, for this purpose, this system devises the liaison tube from air-introduced machine exhaust pass to negative-pressure air fan inlet duct
The flow regulators such as road, and corresponding valve/baffle, in negative-pressure air fan outlet conduit to air preheater First air outlet
Medium oxygen concentration measuring point is provided on road, to as the foundation for adjusting circulation air-introduced machine low exit temperature flue gas medium flow.
10, leak out extracted amount for accurate control hot end fanning strip tapping hot end, avoid negative-pressure sucking it is excessive cause it is primary
Wind, Secondary Air actual flow increase, the enhancing of air side heat-transfer effect, the decline of temperature of rotor level, primary air fan, pressure fan power consumption
Increase；And negative pressure is lower than flue gas pressures, and flue gas medium is drawn into heating wind cabin, influences to stain product removal effect, and
Negative pressure fan blade wheel etching problem is caused, system is leaked out provided with hot end fanning strip extracts pipeline and air preheater inlet flue gas out
Static pressure difference measuring point is equipped with pressure difference test meter at static pressure difference measuring point, by adjusting control valve, will leak out and extracts pressure tune at pipeline out
Extremely consistent with air preheater inlet flue gas pressure under the operating condition, guarantee not will increase First air, Secondary Air air flow rate, and keep away
Exempt to suck flue gas into heating wind cabin.
Above-mentioned apparatus and system intercouple, and a variety of regulative mode combinations become the comprehensive anti-product of rotary regenerative air preheater
The solution of grey contamination system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of this hair；
Fig. 2 is air preheater fume side heat accumulating element Temperature Distribution comparison diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, a kind of system for preventing rotary regenerative air preheater dust stratification from staiing, including three points of rotary air in storehouse are pre-
Hot device, flow area are divided into the wind separating bin 3 of secondary air separating storehouse 1, one time and flue gas point storehouse 4, and a wind separating bin 3 and flue gas divide storehouse
It is mutually separated between 4 with first partition 8, is mutually separated between secondary air separating storehouse 1 and flue gas point storehouse 4 with second partition 5, secondary air separating storehouse
It is mutually separated between 1 and a wind separating bin 3 with the 4th partition 7.The flue gas that boiler combustion generates divides storehouse inlet flue duct 19 to flow from flue gas
Enter, First air air-flow divides storehouse wind inlet channel 17 to flow into from cold end First air, and Secondary Air air-flow enters the wind wind from cold end secondary air separating storehouse
Road 15 flows into；Each fluid streams are after air preheater internal heat, and flue gas divides storehouse exhaust pass 20 to flow out from cold end flue gas, once
Wind divides storehouse exhaust air flue 18 to flow out from hot end First air, and Secondary Air is flowed out from hot end secondary air separating storehouse exhaust air flue 16.
For three points of storehouse air preheaters of such layout pattern, divides inside storehouse in rotor air side, existed by third partition 6
Inside former secondary air separating storehouse, be separated out independent heating wind cabin 2, upper part connects with heating wind cabin wind inlet channel 11, lower part with
Heating wind cabin exhaust air flue 12 connects.Divide second partition 5, hot end First air point between storehouse in hot end secondary air separating storehouse and flue gas
Open suction hole at the top of first partition 8 between storehouse and flue gas point storehouse, suction hole and air preheater hot end are radially leaked out gap company
It is logical, drawn to leaking out in hot end by suction channel 9,10, be equipped on the suction channel that leaks out of every side third control valve 37,
38, it is adjusted by the throughput in 37,38 pairs of suction channels that leak out of third control valve.After two sides suction branch confluence,
Into the heating wind cabin wind inlet channel 11 on heating wind cabin top.
Specifically, first partition 8, second partition 5, third partition 6 and third partition 7 are fanning strip, aspirating hole is along fan
Shape plate is radial in a row uniformly distributed.
Hot end, which is leaked out, enters heating wind cabin 2 by heating wind cabin top heating wind cabin wind inlet channel 11, is formed from hot end to cold
The flowing with flue gas forward at end is absorbed heat from hot end element, to middle-temperature section and cold end unit heat discharging, is flowed compared with from cold end to hot end
Scheme, can be realized the heating effect by a larger margin to medium temperature end bottom corrosion dust stratification greatest risk region, while guaranteeing cold
End element temperature is higher than acid dew point and medium temperature end base member temperature is higher than ammonium hydrogen sulfate (ABS) dew-point temperature, to make
ABS is all deposited on the cold end element layer in big channel, closing template and surface plating enamel, can be by modes such as soot blowings to contamination
Product deposition rate control effectively.Heat medium is flowed out from heating wind cabin lower part heating wind cabin exhaust air flue 12, by removing
Dirt device 51 after removing the fly ash granule carried in medium, flows into negative-pressure air fan 14 by negative-pressure air fan arrival end 13, promotes pressure head
Afterwards, it is flowed out by negative-pressure air fan outlet end 26.The arrival end of negative-pressure air fan 14 and outlet end are respectively equipped with 40 He of the 4th control valve
Rate-of flow may be implemented by adjusting the aperture of the 4th control valve 40 and the 5th control valve 41 in 5th control valve 41
With the change of pressure head.
Referring to Fig. 1, in one embodiment, the outlet end of negative-pressure air fan 14 passes through the first contact pipeline 28 and the second liaison tube
Road 29 is respectively connected to secondary air separating storehouse exhaust air flue 16 and a wind separating bin exhaust air flue 18, the first contact pipeline 28 and second
The first control valve 43 and the second control valve 44 are respectively arranged on contact pipeline 29.
Specifically, the first contact pipeline 28 and the second contact pipeline 29 are by having first flow detection device 46 and air duct
The contact general pipeline of heater 50 is connected to negative-pressure air fan 14, is heated and is set at heating wind cabin outlet air end in wind cabin exhaust air flue 12
There is second flow detection device 45.Contact general pipeline between first flow detection device 46 and duct insert heater 50 passes through band
There is the third service channel 48 of the 6th control valve 47 to be connected to heating wind cabin wind inlet channel 11.
In this system, in performing low-load running of machine set operating condition or preferable air pre-heater sealing condition, air preheater heat
Inleakage is held to reduce, when the heating wind cabin 2 that second flow detection device 45 measures exports rate-of flow lower than the threshold under the operating condition
When being worth flow, the 6th control valve 47 is opened, makes part hot wind medium back flow to wind cabin is heated, makes wind cabin interior media flow not
Lower than the threshold flow under the operating condition.
When unit burning high sulfur coal, SCR denitration device the escaping of ammonia rate are higher, ammonium hydrogen sulfate depositing temperature liter
It is high, it is desirable that middle-temperature section base member temperature promotes amplitude and increases；And between unit low-load period, the colm of difficult kindling is used
When, hot Secondary Air temperature is more demanding, surely fires needs to meet boiler；Low volatile, high moisture fuel are ground in pulverized coal preparation system
When, heat primary air temperature should be correspondinglyd increase to meet fuel dryer needs.Taking into account the above, contact general pipeline is provided with duct insert heater
50, a variety of patterns such as electric heating, steam heating or fuel oil, fuel gas buring heating can be used.
Referring to Fig. 1, in one embodiment, the first contact pipeline 28 passes through the 4th service channel of the 7th control valve 39 of band
33 extract pipeline 8,10 out and are connected to leaking out.
To meet pulverized coal preparation system anti-explosion safety needs, and reduction fuel combustion NOxConcentration of emission, negative-pressure air fan 14 export
End is connected to deduster 22 and air-introduced machine 24 by being equipped with the 5th service channel 27 of the 8th control valve 42, and flue gas point storehouse exports
Flue 20 is connected to deduster 22, and deduster 22 is connected to air-introduced machine 24 by house outlet flue 23, and air-introduced machine 24 goes out
Air piping 25 is connected to by being equipped with the 6th service channel 31 of the 9th control valve 34 with heating wind cabin exhaust air flue 12.Heat wind
Storehouse exhaust air flue 12 is connected to by being equipped with the 7th service channel 32 of the tenth control valve 36 with the 5th service channel 27, Secondary Air
Storehouse wind inlet channel 15 is divided to connect by the 8th service channel 30 with the 11st control valve 35 with heating wind cabin exhaust air flue 12
It is logical.
This system is provided with the 6th contact pipeline 31 from air-introduced machine exhaust pass 25 to heating wind cabin exhaust air flue 12, with
And corresponding 9th control valve 34；Oxygen concentration measuring point is provided on the second contact pipeline 29.When pulverized coal preparation system grinds explosion
The higher fuel of sex index, or seek by reducing pulverized coal preparation system dried medium oxygen concentration to reduce NOxWhen concentration of emission, adjust
11st control valve 35, the 9th control valve 34, third control valve 37,38, by the entrance medium temperature of negative-pressure air fan 14
It controls with oxygen concentration in proper level, then by entering a wind separating bin wind inlet channel 17 to the second contact pipeline 29, and enters
Pulverized coal preparation system plays the role of dry and conveys fuel.
The present embodiment, unit heavy-duty service, use low-sulfur coal, SCR denitration system the escaping of ammonia rate it is lower when,
Air preheater fouling potential is smaller, the system can switch to energy-saving mode operation: (1) setting heating wind cabin exhaust air flue 12 to
7th service channel 32 of the 5th service channel 27, and corresponding tenth control valve 36 is set, do not start negative-pressure air fan 14, closes
Close its 4th control valve 40 and the 5th control valve 41, hot end of rotor leaks out under pressure differential, by 2 hot end of heating wind cabin into
Enter, the flowing of the direction Xiang Lengduan, and enter deduster gas approach 21 through the 7th service channel 32, is guaranteeing accumulatingdust contamination effect
On the basis of, reduce negative-pressure air fan power consumption to the increased influence of units consumption；(2) in air preheater without fouling potential operating condition
Under, it closes hot end and leaks out the associated pipe valve of suction and medium circulation system, including, hot end is leaked out the third on suction channel
Control valve 37,38, the 4th control valve 40 of negative-pressure air fan two sides and the 5th control valve 41, the first control valve 43 and
Two control valves 44, the tenth control valve 36 etc. open the 11st control valve 35, the 7th control valve 39, then part boiler
Air-supply (cold Secondary Air) enters heating wind cabin via the 8th service channel 30, after flue gas adverse current heat exchange heat absorption, is got in touch with by the 4th
Channel 33, which enters secondary air separating storehouse exhaust air flue 16, reduces its exit gas temperature to improve air preheater heat transfer efficiency,
Improve heat recovery rate and unit efficiency.
The present embodiment negative-pressure air fan exports hot wind, according to unit operating condition, burning coal and equipment investment, may be selected not
Same recycling approach, to realize different system functions: (1) exporting hot wind and get in touch with pipeline 27 through third, lead to deduster and enter
Mouth flue 21, since deduster gas approach is negative pressure, the total pressure of negative-pressure air fan rises and power is lower, but flows through heating wind cabin 2
Air-heater leakage recycling not yet in effect, cannot be effectively reduced air leak rate of air preheater level；(2) outlet hot wind warp
First contact pipeline 28, introduces air preheater secondary air separating storehouse exhaust air flue 16, a part as fuel combustion air；
(3) outlet hot wind introduces wind separating bin exhaust air flue 18 of air preheater through the second contact pipeline 29, dry as pulverized coal preparation system
Dry and conveying fuel medium.On the first contact pipeline 28 and the second contact pipeline 29, it is respectively provided with the first control valve
43 and second control valve 44, to adjust the medium for entering a wind separating bin exhaust air flue 18 and secondary air separating storehouse exhaust air flue 16
Flow proportional.When entering, furnace water content of fuel is higher, or when belonging to more difficult kindling coal, an air temperature into pulverized coal preparation system is answered
It is higher, at this point, the second control valve 44 should be turned down/be closed, hot wind medium is made more to enter secondary air separating storehouse exhaust air flue 16；
First contact pipeline 28 and the second contact pipeline 29 pass through the contact with first flow detection device 46 and duct insert heater 50
General pipeline is connected to heating wind cabin exhaust air flue, is heated and is equipped with second flow at heating wind cabin outlet air end in wind cabin exhaust air flue
Detection device 45 can be examined into air duct of air preheater outlet, the hot wind medium total flow of secondary air duct by first flow
It surveys device 46 to obtain, in order to which operations staff monitors and adjusts.It is aspirated at this point, air preheater hot end is leaked out by negative-pressure air fan 14
Fuel combustion, which is participated in, into air duct flows through air preheater First air, secondary air separating under the premise of excess air coefficient is constant
The air mass flow in storehouse reduces, and air/smoke heat capacity ratio reduces, and temperature of rotor is horizontal further to be promoted.
It leaks out extracted amount accurately to control hot end, avoids negative-pressure sucking is excessive from causing the practical stream that leaks out of First air, Secondary Air
Amount increases, and the cooling enhancing of air side, the decline of temperature of rotor level, primary air fan, pressure fan power consumption increase；And negative pressure is lower than cigarette
Flue gas medium is drawn into rotor heating wind cabin, influences to stain product removal effect, cause negative pressure fan blade wheel rotten by atmospheric pressure
Erosion, in the pressure difference test meter 49 extracted out between pipeline and flue gas point storehouse inlet flue duct that leaks out, extracts pipeline 9,10 out for that will leak out
Place's pressure be adjusted to it is consistent with air preheater flue gas point storehouse inlet flue duct pressure, so that First air, secondary air flow will not be increased,
And it avoids sucking flue gas into rotor heating wind cabin.
The rotary air of San Fencang that certain 600MW Thermal generation unit boiler configures 2 model LAP13494/2550 is pre-
Hot device, heat accumulating element divide hot end, middle-temperature section, three layer arrangement of cold end, and height is respectively 800mm, 800mm, 950mm, former design side
Under case and this patent scheme, the comparison of air preheater fume side heat accumulating element Temperature Distribution is as shown in Figure 2.As it can be seen that former design side
Under case, within the scope of middle-temperature section bottom part element heights (as shown in shadow region in figure), in rotor gyration period, there are sulphur
Sour hydrogen ammonia-sinking product is stain, and may cause dust stratification blocking；After this patent scheme, middle-temperature section and cold end component temperature are effectively mentioned
It rises, on the basis of the upper limit (about 200 DEG C) of ammonium hydrogen sulfate Common deposition temperature range, middle-temperature section component temperature is in all revolution weeks
This temperature threshold is above in phase, then ammonium hydrogen sulfate deposition section is entirely located in cold end range of components, can pass through soot blowing etc.
Mode effectively removes, so that the dust stratification of rotary regenerative air preheater heat accumulating element be effectively prevent to stain.
Above-described embodiment is only to clearly demonstrate examples made by the present invention, rather than the restriction to embodiment.For
For those of ordinary skill in the art, other various forms of variations or change can also be made on the basis of the above description
It is dynamic.Here without can not be also exhaustive to all embodiments.And the obvious variation or change thus amplified out
It is dynamic to be still in the protection scope of this invention.
Claims (10)
1. a kind of system for preventing rotary regenerative air preheater dust stratification from staiing, including inside are formed with flue gas point storehouse, First air point
The air preheater in storehouse and secondary air separating storehouse is isolated between the flue gas Fen Cang and a wind separating bin by first partition, described
Flue gas divides between storehouse and secondary air separating storehouse and is isolated by second partition, is separated out and is added by third partition in the secondary air separating storehouse
Hot wind storehouse, it is characterised in that: the first partition and/or second partition positioned at air preheater hot end are equipped with pre- with air
Radially leak out the aspirating hole that gap is connected in hot device hot end, and the aspirating hole extracts pipeline and heating wind cabin wind inlet channel out by leaking out
Connection, heating wind cabin exhaust air flue are connected to negative-pressure air fan；Wherein, the heating wind cabin is located at the one end in air preheater hot end
It is outlet air end positioned at one end of air preheater cold-end air for air intake.
2. system according to claim 1, it is characterised in that: the outlet end of the negative-pressure air fan passes through the first contact pipeline
A wind separating bin exhaust air flue and secondary air separating storehouse exhaust air flue, first liaison tube are respectively connected to the second contact pipeline
The first control valve and the second control valve are respectively arranged on road and the second contact pipeline, and described leak out is extracted pipeline out and be equipped with
Third control valve.
3. system according to claim 2, it is characterised in that: the first contact pipeline and the second contact pipeline pass through band
There is the contact general pipeline of first flow detection device and duct insert heater to be connected to the negative-pressure air fan, the heating wind cabin outlet air wind
Second flow detection device is equipped at heating wind cabin outlet air end on road.
4. system according to claim 3, it is characterised in that: be located at the first flow detection device and duct insert heater
Between contact general pipeline by being connected to the third service channel of the 6th control valve with the heating wind cabin wind inlet channel.
5. system according to claim 4, it is characterised in that: the second contact pipeline passes through the 7th control valve of band
4th service channel is extracted pipeline out and is connected to described leak out.
6. system according to claim 2, it is characterised in that: be additionally provided with dedusting dress in the heating wind cabin exhaust air flue
It sets, the inlet end and an outlet end of the negative-pressure air fan is respectively equipped with the 4th control valve and the 5th control valve.
7. system according to claim 1, it is characterised in that: the system also includes settings to extract pipeline and cigarette out leaking out
Gas divides the pressure difference test meter between the inlet flue duct of storehouse.
8. system according to claim 1, it is characterised in that: the first partition, second partition and third partition are
Fanning strip, the aspirating hole are radial in a row uniformly distributed along the fanning strip.
9. system according to claim 1-8, it is characterised in that: the outlet end of the negative-pressure air fan is by having
5th service channel of the 8th control valve is sequentially connected to deduster and air-introduced machine, and flue gas point storehouse exhaust pass is connected to described
Deduster, the wind pipe of the air-introduced machine are gone out by being equipped with the 6th service channel of the 9th control valve with the heating wind cabin
The connection of wind air duct is provided with oxygen concentration measuring point on the second contact pipeline.
10. system according to claim 9, it is characterised in that: the heating wind cabin exhaust air flue is adjusted by being equipped with the tenth
7th service channel of section valve is connected to the 5th service channel, and secondary air separating storehouse wind inlet channel with the 11st by adjusting
8th service channel of section valve is connected to the heating wind cabin exhaust air flue.
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| CN110500607A (en) * | 2019-08-21 | 2019-11-26 | 南京兆能节能科技有限公司 | A kind of dust-proof control block apparatus of rotary air preheater heat accumulating element and its dust-proof control blocking method |
| CN110822468A (en) * | 2019-09-23 | 2020-02-21 | 西安交通大学 | Novel rotary step heat accumulating type air preheater |
| CN111306566A (en) * | 2020-02-20 | 2020-06-19 | 华电电力科学研究院有限公司 | Separation type air preheating system and method for preventing ABS (anti-lock brake System) of air preheater from being blocked |
| CN111306568A (en) * | 2020-02-26 | 2020-06-19 | 华电电力科学研究院有限公司 | Device and method for relieving blockage of rotary air preheater by preheating heat storage element through hot air |
| CN113361171A (en) * | 2021-06-11 | 2021-09-07 | 西安交通大学 | Rotary air preheater dust deposition layered monitoring method based on finite difference method |
| CN113983488A (en) * | 2021-11-08 | 2022-01-28 | 国网山东省电力公司电力科学研究院 | Anti-blocking system and method for air preheater of coal-fired unit boiler |
| CN116754447A (en) * | 2023-08-10 | 2023-09-15 | 苏州西热节能环保技术有限公司 | Air preheater heat exchange ABS deposition simulation system and method along Cheng Yanqi |
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| CN113983488A (en) * | 2021-11-08 | 2022-01-28 | 国网山东省电力公司电力科学研究院 | Anti-blocking system and method for air preheater of coal-fired unit boiler |
| CN113983488B (en) * | 2021-11-08 | 2024-04-09 | 国网山东省电力公司电力科学研究院 | Anti-blocking system and method for air preheater of coal-fired unit boiler |
| CN116754447A (en) * | 2023-08-10 | 2023-09-15 | 苏州西热节能环保技术有限公司 | Air preheater heat exchange ABS deposition simulation system and method along Cheng Yanqi |
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