CN207279687U - A kind of air preheater for including anti-blocking ash system - Google Patents
A kind of air preheater for including anti-blocking ash system Download PDFInfo
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- CN207279687U CN207279687U CN201721019416.3U CN201721019416U CN207279687U CN 207279687 U CN207279687 U CN 207279687U CN 201721019416 U CN201721019416 U CN 201721019416U CN 207279687 U CN207279687 U CN 207279687U
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- 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
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Abstract
The utility model discloses a kind of air preheater for including anti-blocking ash system, including adjacent wind separating bin and secondary air separating storehouse, further include anti-blocking ash content storehouse and heat primary air leaks out air passage；Anti-blocking ash content storehouse is located at the cold end in secondary air separating storehouse, and adjacent with a wind separating bin；Hot junction fanning strip between wind separating bin and secondary air separating storehouse is equipped with air outlet, and heat primary air leaks out, and air passage one end connects with air outlet, the other end leads to anti-blocking ash content storehouse.In above-mentioned anti-blocking ash content storehouse, whether visual stifled ash tendency is substantially passed through gas with various, including middle heat primary air leaks out, heat primary air and cold Secondary Air, takes into account that air preheater is anti-blocking and energy saving in running.The utility model has the advantages that：Simple in structure, reduced investment, operational reliability is high, possesses the preferable ability for preventing low-temperature corrosion and blocking up ash, is conducive to improve the security and economy of steam generator system operation.
Description
Technical field
A kind of air preheater for including anti-blocking ash system is the utility model is related to, belongs to Air Preheater Technology field.
Background technology
Rotary regenerative air preheater is (referred to as " air preheater ") a kind of heat-exchange apparatus for large-sized station boiler,
It heats the air needed for burning using the heat of boiler smoke, and the efficiency of boiler is improved with this.
Air preheater focus of attention problem mainly includes stifled ash, air leak rate of air curtain is higher, heat transfer efficiency is low, low-temperature corrosion is tight
Again etc., these problems affect the safe and economical operation of air preheater and whole steam generator system for a long time.
The above problem is long-standing, and mutually promotes, influences each other.In recent years, generally putting into operation with denitrating system,
Air preheater running environment changes, and above-mentioned stifled grey problem becomes especially prominent, administers difficult, complicated.
The denitrating flue gas facility that coal-burning power plant adds at present is mainly based on selective catalytic reduction (SCR) technology.Using
After SCR denitration technique, the part SO in flue gas2SO will be oxidized to by denitrating catalyst3, add SO in flue gas3Volume it is dense
Degree, in addition there are inevitable the escaping of ammonia phenomenon, causes ammonium hydrogen sulfate (NH4HSO4) etc. accessory substance a large amount of generations, and improve
Flue gas acid dew point temperature, causes low-temperature corrosion to aggravate.
Above-mentioned accessory substance ammonium hydrogen sulfate (NH4HSO4) in the range of temperature is 146~207 DEG C, in molten, can firmly glue
Air preheater heat accumulating element surface is attached to, makes heat accumulating element that corrosion and dust stratification occur, it is final easily to trigger stifled ash, the peace to unit
Row for the national games causes very big hidden danger.Existing part power plant of the country causes unit load limit because can not solve the problems, such as or alleviating this, very
To by forced-stopping machine.
When exhaust gas temperature is less than acid dew point, sulfuric acid vapor will condense, and sulfuric acid droplets are attached on cold end heat accumulating element, rotten
Lose heat accumulating element.The acid dew point of flue gas is with SO3The rise of concentration and improve, typically up to 130~160 DEG C.Due to denitrating system
Add SO2To SO3Conversion ratio, that is, improve SO in flue gas3Concentration, and many power plant cost of electricity-generating in order to control, actual coal
The sulfur of kind is generally higher than design coal, and therefore, the acid dew point of many power plant is higher than exhaust gas temperature at present, causes low-temperature corrosion
(acid dew piont corrosion) aggravates, and it is quite prominent to block up ash problem.
Large coal-fired power plant air preheater rotor is mostly 36 storehouse Ge Huo48 storehouses lattice structures at present, between each storehouse lattice by every
Plate separates, and is provided with apex seal on partition plate, and the fanning strip of apex seal and certain angle cooperatively forms double containment or three
Sealing, so as to reduce positive pressure air (including First air and Secondary Air) to the leakage rate and First air of negative pressure flue gas to Secondary Air
Leakage rate.Some storehouse lattices between adjacent fanning strip typically divide chamber structure to be divided into three Fen Cang and four points into each point of storehouse
Storehouse.Three points of storehouse air preheaters include three points of storehouses：One flue gas Fen Cang, a wind separating bin and a secondary air separating storehouse；
Four points of storehouse air preheaters include four points of storehouses：One flue gas Fen Cang, a wind separating bin and two secondary air separating storehouses, and one
Secondary wind separating bin is between two secondary air separating storehouses (the purpose is to reduce the leakage rate of air to flue gas).Work as Ash Blocking in Air Preheater
Problem occurs, and above-mentioned each point of storehouse flow area diminishes, and causes air-introduced machine, primary air fan and pressure fan power consumption to be substantially increased, and discharges fume
Temperature also rises therewith, significantly affects the economy of boiler operatiopn；And be also easy to trigger fan stall and surge, will when serious
Cause boiler limited load even forced outage, larger threat is caused to the safety of boiler operatiopn.
Utility model content
In order to solve when first three Fen Cang, four points of storehouse Ash Blocking in Air Preheater problems, the utility model provides a kind of comprising anti-
The air preheater of stifled ash system.
In order to solve the above technical problems, technical solution is as follows used by the utility model：
A kind of air preheater for including anti-blocking ash system, including adjacent wind separating bin and secondary air separating storehouse, are also wrapped
Include anti-blocking ash content storehouse and heat primary air leaks out air passage；Anti-blocking ash content storehouse is located at the cold end in secondary air separating storehouse, and with a wind separating bin
It is adjacent；Hot junction fanning strip between wind separating bin and secondary air separating storehouse is equipped with air outlet, and heat primary air leaks out air passage one end
Connect with air outlet, the other end leads to anti-blocking ash content storehouse.
The heat primary air that the above-mentioned hot junction fanning strip centre air vent between a wind separating bin and secondary air separating storehouse is drawn
Leak out, referred to as middle heat primary air leaks out or heat primary air to Secondary Air leaks out.Leaked out by middle heat primary air and purge and add
Heat accumulating element in the hot rotor storehouse lattice that it is currently covered, to prevent stifled ash.
Above-mentioned anti-blocking ash content storehouse is the core component of anti-blocking ash system.To build above-mentioned anti-blocking ash content storehouse, Secondary Air
Cold end sector plate fan angle is more than at least one complete storehouse lattice of hot junction fanning strip fan angle between Fen Cang and wind separating bin
Angle, and anti-blocking grey air nozzle is radially equipped between secondary air separating storehouse and a wind separating bin on cold end sector plate, heat is once
Wind leaks out, and air passage one end connects with air outlet, the other end leads to anti-blocking grey air nozzle.
The application radially refers to the direction consistent with rotor radial.It is edge to be radially equipped with anti-blocking grey air nozzle namely air nozzle
The strip that fanning strip is radially set, is preferably fan shape.Above-mentioned fanning strip fan angle refers to the central angle angle of fanning strip.
Applicant it has been investigated that, there are one in the region that fanning strip is covered between a wind separating bin and secondary air separating storehouse
Transition region, the pressure of the transition region is higher than the pressure in secondary air separating storehouse less than the pressure of a wind separating bin, therefore intermediate heat
First air, which leaks out, can flow to anti-blocking ash content storehouse certainly.During above-mentioned middle heat primary air leaks out, original is mostly directly to leak into heat
In Secondary Air, and the cold end in secondary air separating storehouse will be flow to after drawing certainly, local heat accumulating element is heated into anti-blocking ash content storehouse, then
Import in hot Secondary Air.Due to mainly make use of original First air for directly leaking into secondary air separating storehouse, the above process is disappeared
The energy of consumption is less, and anti-blocking grey effect well is obtained with less cost.The application is once leaked out heating office using intermediate heat
Portion's heat accumulating element, makes the acidic liquids such as sulfuric acid, ammonium hydrogen sulfate gasify, and then dust stratification is become loose, in addition with respect to high flow rate
Airflow function, anti-blocking ash effect are quite prominent.
It is preferred that air outlet is located at the centre of the hot junction fanning strip between a wind separating bin and secondary air separating storehouse.In herein
Between refer on the bisector of angle of fanning strip center.
In order to reduce the operation energy consumption of above-mentioned anti-blocking ash system, heat primary air, which leaks out, sets the isolation door that leaks out on air passage.When
When air preheater is inclined to without stifled ash or stifled ash is inclined to unobvious, shut-off, which is leaked out, completely cuts off door.
In order to further enhance anti-blocking grey effect, the heat primary air of isolation door upstream of leaking out leaks out air passage and heat primary air
Connection air passage is connected, and heat primary air connection air passage is connected with heat primary air road, and heat primary air connection sets hot air isolating on air passage
Door.When Ash Blocking in Air Preheater tendency is more apparent, hot air isolating door is opened, increases the heat primary air stream in anti-blocking ash content storehouse
Amount.
In order to strengthen the flexibility of above-mentioned anti-blocking ash system operation, further development of latent energy-saving potential, isolation passage downstream of leaking out
Heat primary air air passage and cold Secondary Air connection air passage of leaking out be connected, cold Secondary Air connection air passage is connected with cold secondary air duct, cold
Secondary Air connection sets cold wind to completely cut off door on air passage.When air preheater is without stifled ash tendency or stifled ash tendency unobvious, close
Leak out isolation door, opening cold wind isolation door, is passed through cold Secondary Air in above-mentioned anti-blocking ash content storehouse, absorbs heat, increase through heat accumulating element
Air side endotherm area, advantageously reduces exhaust gas temperature, improves boiler efficiency.
The application heat primary air connection air passage is the air passage directly connected with heat primary air road, for taking heat primary air.It is cold
Secondary Air connection air passage is the direct air passage connected with cold secondary air duct, for taking cold Secondary Air.
In order to adjust heat primary air flow in anti-blocking ash content storehouse, heat primary air connection sets hot wind to adjust door on air passage.It is logical
Cross and aperture is decreased or increased, can turn or tune up flow down.
Above-mentioned upstream and downstream refers both to the upstream and downstream of gas normal flow direction, namely gas flow direction and upstream
Direction to downstream is consistent.
Above-mentioned anti-blocking ash system self-operating needs to consume the energy, but stifled grey problem is alleviated or avoided can obtain that compare can again
The energy-saving benefit of sight, comprehensive benefit be energy consumption or it is energy saving, depend primarily upon the method for operation and anti-blocking grey actual effect.It is if logical
Enter middle heat primary air to leak out, itself energy consumption is smaller, plays preferable anti-blocking grey effect, is a kind of basic operational mode；If
Under basic operational mode, anti-blocking ash is ineffective, then needs additionally to be passed through heat primary air, increases and enters heat in anti-blocking ash content storehouse
Wind flow, strengthens anti-blocking grey effect, but itself energy consumption is larger at this time；If present air preheater is without stifled ash tendency or stifled
Ash tendency unobvious, above-mentioned basic operational mode can be out of service, cold Secondary Air is only passed through in anti-blocking ash content storehouse, at this time without anti-
Stifled ash effect, but also do not consume the energy additionally substantially.
To ensure preferable anti-blocking grey effect, while increase itself energy consumption of anti-blocking ash system as little as possible again, using anti-
Control mode optimization operation is presented, primary feedback control signal is used as using unit load and air preheater fume side drag parameter.
Leak out it is preferred that being continually fed into middle heat primary air when air preheater fume side pressure difference rises more than 10%, in anti-blocking ash content storehouse,
If fume side pressure difference is increased beyond 30%, then heat primary air is additionally passed through, increases heat primary air flow；If fume side pressure difference is not
When rising or rising above 10%, meet the condition that unit load rate is more than 70%, be then passed through cold two in anti-blocking ash content storehouse
Secondary wind, if fume side pressure difference does not rise or rises less than 10%, while meets the condition that unit load rate is not more than 70%,
Middle heat primary air is passed through in anti-blocking ash content storehouse to leak out.
The unmentioned technology of the utility model is with reference to the prior art.
The utility model includes the air preheater of anti-blocking ash system, has the advantages that：It is simple in structure, investment
Save, operational reliability is high, possesses the preferable ability for preventing low-temperature corrosion and blocking up ash, is conducive to improve the peace of steam generator system operation
Full property and economy.
Brief description of the drawings
Fig. 1 is three points of storehouse air preheater schematic diagrames that embodiment 1 includes anti-blocking ash system.
Fig. 2 is four points of storehouse air preheater schematic diagrames that embodiment 2 includes anti-blocking ash system.
Fig. 3 is the schematic diagram of the anti-blocking grey principle of the utility model air preheater.
In figure, 1 is anti-blocking ash content storehouse, and 2 be anti-blocking grey air nozzle, and 3 is cold between a wind separating bin and secondary air separating storehouse
Fanning strip is held, the 4 hot junction fanning strip for a wind separating bin and secondary air separating storehouse between, 5 leak out air passage for heat primary air, and 6 be storage
Thermal element, 7 be transition region, and 8 be the isolation door that leaks out, and 9 be hot air isolating door, and 10 completely cut off door for cold wind, and 11 adjust door for hot wind, 12
It is heat primary air for air outlet, 13,14 be cold Secondary Air；G divides storehouse for flue gas, and A1 is a wind separating bin, and A2 is secondary air separating storehouse.
Embodiment
The utility model in order to better understand, the content of the utility model is furtherd elucidate with reference to embodiment, but
The content of the utility model is not limited solely to the following examples.
Embodiment 1
As shown in Figure 1, a kind of three points of storehouse air preheaters comprising anti-blocking ash system, including flue gas adjacent successively point
Storehouse, a wind separating bin and secondary air separating storehouse, further include anti-blocking ash content storehouse and heat primary air leaks out air passage；Anti-blocking ash content storehouse is located at two
The cold end of secondary wind separating bin, and it is adjacent with a wind separating bin, to build above-mentioned anti-blocking ash content storehouse, secondary air separating storehouse and a wind separating bin
Between cold end sector plate fan angle be more than the angles of at least one complete storehouse lattice of hot junction fanning strip fan angle, and secondary air separating
Anti-blocking grey air nozzle is radially equipped between storehouse and a wind separating bin on cold end sector plate；Wind separating bin and secondary air separating storehouse it
Between the centre of hot junction fanning strip be equipped with air outlet, heat primary air leak out air passage one end connect with air outlet, the other end lead to it is anti-
Stifled ash air nozzle.
Heat primary air, which leaks out, sets the isolation door that leaks out on air passage；The heat primary air of isolation door upstream of leaking out leaks out air passage and heat
First air connection air passage is connected, and heat primary air connection air passage is connected with heat primary air road, and heat primary air connection sets heat on air passage
Wind completely cuts off door, and heat primary air connection sets hot wind to adjust door on air passage；Leak out isolation passage downstream heat primary air leak out air passage with
Cold Secondary Air connection air passage is connected, and cold Secondary Air connection air passage is connected with cold secondary air duct, is set on cold Secondary Air connection air passage
Cold wind completely cuts off door.
During work, leaked out by middle heat primary air and purging and heat the accumulation of heat member in the rotor storehouse lattice that it currently covers
Part, to prevent stifled ash；When air preheater is inclined to without stifled ash or stifled ash is inclined to unobvious, shut-off, which is leaked out, completely cuts off door；Work as air
Preheater block up ash tendency it is more apparent when, open hot air isolating door, increase the heat primary air flow in anti-blocking ash content storehouse；When air is pre-
When hot device is inclined to without stifled ash or stifled ash is inclined to unobvious, closing, which is leaked out, to completely cut off door, opens cold wind isolation door, above-mentioned anti-blocking ash content storehouse
In be passed through cold Secondary Air, absorb heat through heat accumulating element, increase air side endotherm area, advantageously reduce exhaust gas temperature, improve pot
The efficiency of furnace.
After three points of storehouse air preheaters install anti-blocking ash system additional, the benefit obtained includes：1) avoid straight caused by stifled ash
Connect loss, the electromechanical consumption of such as three strong wind rises, exhaust gas temperature rises, the too fast loss of heat accumulating element service life, unit is non-stops；2) commonly use
The steam soot blowing frequency can be greatly reduced, save the steam of a large amount of high-quality；3) the no longer puzzlement of blocking ash problem, can depth digging
Dig the space that exhaust gas temperature declines, the anti-blocking grey equipment and system of traditional highly energy-consuming, such as steam air heater and thermal wind sensor system
System can disable, enamel heat accumulating element is changed to more efficient common heat accumulating element etc., in addition, heat accumulating element can use it is more efficient
Waveform, there is headspace also can further increase accumulation of heat face；4) allow denitrating system higher the escaping of ammonia rate and will not air
Preheater blocks up ash, so as to be conducive to control NOx emission concentration in more low-level.
Embodiment 2
As shown in Figure 1, a kind of four points of storehouse air preheaters comprising anti-blocking ash system, with embodiment 1 except that：Four
Point storehouse air preheater includes four points of storehouses：One flue gas Fen Cang, a wind separating bin and two secondary air separating storehouses, and once
Between two secondary air separating storehouses, the centre of the hot junction fanning strip between a wind separating bin and secondary air separating storehouse is equipped with wind separating bin
Air outlet, due to there is two secondary air separating storehouses, there is two air outlets, and two air outlets leak out air passage phase with heat primary air
Connect.
Embodiment 1 and embodiment 2 can operate as follows, when air preheater fume side pressure difference rises more than 10%
When, middle heat primary air is continually fed into anti-blocking ash content storehouse, if fume side pressure difference is increased beyond 30%, then is additionally passed through heat one
Secondary wind, increases heat primary air flow；If fume side pressure difference does not rise or rises above 10%, meet that unit load rate is more than
70% condition, then be passed through cold Secondary Air in anti-blocking ash content storehouse, if fume side pressure difference does not rise or rises less than 10%, together
When meet the condition that unit load rate is not more than 70%, in anti-blocking ash content storehouse be passed through middle heat primary air and leak out.
Using the above method, it both can guarantee that the good blocking-proof result of air preheater, and also effectively controlled anti-blocking ash system
The operation energy consumption of itself, for 300MW grades and above coal unit, can save hundreds thousand of fuel costs every year.
Claims (7)
1. a kind of air preheater for including anti-blocking ash system, including adjacent wind separating bin and secondary air separating storehouse, its feature
It is：Further include anti-blocking ash content storehouse and heat primary air leaks out air passage；Anti-blocking ash content storehouse is located at the cold end in secondary air separating storehouse, and with one
Secondary wind separating bin is adjacent；Hot junction fanning strip between wind separating bin and secondary air separating storehouse is equipped with air outlet, and heat primary air leaks out
Air passage one end connects with air outlet, the other end leads to anti-blocking ash content storehouse.
2. the air preheater of anti-blocking ash system is included as claimed in claim 1, it is characterised in that：Secondary air separating storehouse with once
Cold end sector plate fan angle is more than the angle of at least one complete storehouse lattice of hot junction fanning strip fan angle, and two between wind separating bin
Radially it is equipped with anti-blocking grey air nozzle between secondary wind separating bin and a wind separating bin on cold end sector plate, heat primary air leaks out air passage one
End connects with air outlet, the other end leads to anti-blocking grey air nozzle.
3. the air preheater of anti-blocking ash system is included as claimed in claim 1 or 2, it is characterised in that：Air outlet is located at one
The centre of hot junction fanning strip between secondary wind separating bin and secondary air separating storehouse.
4. the air preheater of anti-blocking ash system is included as claimed in claim 1 or 2, it is characterised in that：Heat primary air leaks out
The isolation door that leaks out is set on air passage.
5. the air preheater of anti-blocking ash system is included as claimed in claim 1 or 2, it is characterised in that：Leak out on isolation door
The heat primary air of trip air passage and heat primary air connection air passage of leaking out is connected, and heat primary air connection air passage is connected with heat primary air road,
Heat primary air connection sets hot air isolating door on air passage.
6. the air preheater of anti-blocking ash system is included as claimed in claim 1 or 2, it is characterised in that：Leak out under isolation door
The heat primary air of trip air passage and cold Secondary Air connection air passage of leaking out is connected, and cold Secondary Air connection air passage is connected with cold secondary air duct,
Cold wind is set to completely cut off door on cold Secondary Air connection air passage.
7. the air preheater of anti-blocking ash system is included as claimed in claim 1 or 2, it is characterised in that：Heat primary air connects
Hot wind is set to adjust door on air passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721019416.3U CN207279687U (en) | 2017-08-15 | 2017-08-15 | A kind of air preheater for including anti-blocking ash system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721019416.3U CN207279687U (en) | 2017-08-15 | 2017-08-15 | A kind of air preheater for including anti-blocking ash system |
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| Publication Number | Publication Date |
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| CN207279687U true CN207279687U (en) | 2018-04-27 |
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ID=61984046
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721019416.3U Expired - Fee Related CN207279687U (en) | 2017-08-15 | 2017-08-15 | A kind of air preheater for including anti-blocking ash system |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017499A (en) * | 2019-04-04 | 2019-07-16 | 国家电投集团电站运营技术（北京）有限公司 | A kind of method that air preheater cold-end air heat accumulating element divides ring anti-blocking |
-
2017
- 2017-08-15 CN CN201721019416.3U patent/CN207279687U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017499A (en) * | 2019-04-04 | 2019-07-16 | 国家电投集团电站运营技术（北京）有限公司 | A kind of method that air preheater cold-end air heat accumulating element divides ring anti-blocking |
| CN110017499B (en) * | 2019-04-04 | 2020-03-31 | 国家电投集团电站运营技术（北京）有限公司 | Method for preventing blockage of cold-end heat storage element of air preheater in ring-dividing manner |
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Granted publication date: 20180427 |