CN108534172A - For preventing the system that deposit blocks in rotary regenerative air preheater - Google Patents
For preventing the system that deposit blocks in rotary regenerative air preheater Download PDFInfo
- Publication number
- CN108534172A CN108534172A CN201810441910.1A CN201810441910A CN108534172A CN 108534172 A CN108534172 A CN 108534172A CN 201810441910 A CN201810441910 A CN 201810441910A CN 108534172 A CN108534172 A CN 108534172A
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- China
- Prior art keywords
- air
- secondary air
- fanning strip
- rotary regenerative
- cold end
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a kind of for preventing the system that deposit blocks in rotary regenerative air preheater, it is characterized in that adding atomizing lance on rotary regenerative air preheater, Secondary Air circulation air path, high-temperature blower, fan nozzle, the atomizing lance is arranged close to the First air side of cold end First air/Secondary Air fanning strip, it is connected with NaOH solution storage tank, the Secondary Air circulation air path entrance is located at hot junction Secondary Air exit, outlet is located at thermal wind sensor area, it is connected with fan nozzle, high-temperature blower is provided on air duct.The present invention is by chemically reacting the method eliminated and be combined with high-temperature gasification, other than it can thoroughly solve ammonium hydrogen sulfate deposit online and block, moreover it is possible to effectively prevent the low-temperature corrosion of air preheater cold end.
Description
Technical field
The invention belongs to air preheater accumulatingdust technical fields, and in particular to one kind is for preventing swinging air preheat
The system that ammonium hydrogen sulfate deposit blocks in device.
Background technology
Currently, the coal-burning power plant of thumping majority has been made denitration transformation.Due to selective-catalytic-reduction denitrified method
(SCR) technology maturation, denitration efficiency are high, stable and be widely used.As SCR reactor run times increase
And ammonia spraying amount increases when ultra-clean discharge, there is different degrees of dust stratification, burn into blockage problem in air preheater.Make air-supply
Machine and air-introduced machine resistance increase, and coal-grinding fan delivery is inadequate, and exhaust gas temperature increases.Some power plant's air preheaters block seriously, draw
Fan stall chaser causes unit to face and stops, and has seriously affected unit operation economy and safety.
When SCR is run, ammonium hydrogen sulfate unavoidably will produce.The fusing point of ammonium hydrogen sulfate is 147 DEG C, and boiling point is 350 DEG C,
It can be reacted with aqueous slkali and generate ammonia.When ammonium hydrogen sulfate generates in flue gas, generally gaseous state, concentration is not high in flue gas.
As flue-gas temperature constantly reduces, gaseous sulfuric acid hydrogen ammonium will be condensed into liquid (below dew-point temperature), dew-point temperature and hydrogen sulfate
Ammonium concentration is related.A large amount of experimental study shows that when boiler smoke temperature is down to 220-230 DEG C, gaseous sulfuric acid hydrogen ammonium will change
For liquid, condense on heating surface.Substantially 120~230 DEG C of low-temperature zone temperature in rotary regenerative air preheater.In this temperature
In range, there is very strongly adherent liquid sulfuric acid hydrogen ammonium, heat exchange element surface can be attached to rapidly, and largely adsorb in flue gas
Flying dust causes the blocking of air preheater.
For the ammonium hydrogen sulfate blockage problem of air preheater, there is presently no effective solution schemes, can alleviate the problem
Measure mainly has online steam blowing, high pressure water washing, using enamel heat exchange element, optimization SCR device operation, reduces ammonia and lets out
Leakage.But operative practice shows that above method is unable to reach ideal effect.For the serious unit of Partial Blocking, some electricity
Factory uses unconventional processing method：In boiler at low load, a secondary air system of side air preheater is shut down, flue gas is utilized
Temperature eliminate deposit, and achieve all well and good effect.But this operation may cause air preheater low-temperature zone heated
Facial disfigurement, enamel are impaired, and swell increment is big etc., belong to non routine operation, can only be used in last resort.
Invention content
In view of the deficiencies of the prior art, the present invention is intended to provide hydrogen sulfate ammonia-sinking in a kind of prevention rotary regenerative air preheater
The system that product object blocks, simple in structure, improvement cost is smaller, short construction period, and former air preheater is had substantially no effect on after the completion of transformation
Design parameter, efficiently and more stability and safety
Above-mentioned purpose that the invention is realized by the following technical scheme：
For preventing the system that deposit blocks in rotary regenerative air preheater, rotary regenerative air preheater includes First air
Point storehouse, secondary air separating storehouse, flue gas divide storehouse, rotor, hot junction First air/fume side fanning strip, hot junction First air/Secondary Air side fan-shaped
Plate, hot junction Secondary Air/fume side fanning strip, cold end First air/fume side fanning strip, cold end First air/Secondary Air side fanning strip,
Cold end Secondary Air/fume side fanning strip, apex seal, it is characterised in that atomization spray is added on rotary regenerative air preheater
Rifle, Secondary Air circulation air path, high-temperature blower, fan nozzle, the atomizing lance is close to cold end First air/Secondary Air fanning strip
First air side setting, be connected with NaOH solution storage tank, the Secondary Air circulation air path entrance is located at hot junction Secondary Air and goes out
At mouthful, outlet is located at thermal wind sensor area, is connected with fan nozzle, high-temperature blower is provided on air duct.To ensure sealing effect,
Fanning strip sealing together is installed additional in the fan nozzle other side, sealing sector plate width is related with air preheater apex seal quantity,
It should ensure that at least one piece of apex seal is always positioned on fanning strip when air preheater is run.
Steam sootblower is arranged inside the fan nozzle, there is the slideway of radial arrangement in the bottom of steam sootblower, blows
Grey device can move back and forth according to pre-set programs along slideway.Soot blower can move back and forth along slideway, primary every soot blowing for 24 hours.
The thermal wind sensor area is located close to the Secondary Air side of cold end Secondary Air/flue gas fanning strip.Two drawn
Secondary air temperature is 330 DEG C.
The spray gun tail portion is disposed with flow controller, can be according to the pressure condition adjust automatically NaOH solution of air preheater
Emitted dose.
Compared with prior art, the invention has the advantages that：
Using the deposit of the heat air preheater cold end of hot Secondary Air, in addition to can effectively prevent ammonium hydrogen sulfate deposit
Blocking, reduce outside wind turbine power consumption and exhaust gas temperature, moreover it is possible to prevent gaseous state H to a certain extent2SO4Liquefaction.The NaOH of penetrating
Solution can not only be with NH4HSO4Reaction can also neutralize cold end liquefied H on a small quantity2SO4, can effectively prevent air preheater cold end
Low-temperature corrosion promotes the service life of heat exchange element.
It uses chemical reaction and eliminates the method being combined with hot wind gasification, under double action, prevent hydrogen sulfate ammonia-sinking
The effect that product object blocks is more preferable.
Its essence of the invention is to be reacted using NaOH solution and the ammonium hydrogen sulfate in deposit, and combine high temperature and high speed
Gasify remaining ammonium hydrogen sulfate of Secondary Air thoroughly remove deposit using steam sootblower after deposit becomes loose.
After the completion of transformation can continuous on-line operation, and since the generation of ammonium hydrogen sulfate deposit is continuous.Therefore of the invention and online
Steam soot blowing, online high pressure water washing are compared with light water such as rinses at the intermittent method, highly efficient and more stability and peace
Quan Xing.
Description of the drawings
Fig. 1 is the system schematic after the preceding rotary regenerative air preheater of repacking is circumferentially unfolded.
Fig. 2 be repacking after rotary regenerative air preheater be circumferentially unfolded after system schematic.
Fig. 3 is the structural schematic diagram at fan nozzle.
In figure, 1 is a wind separating bin, and 2 be secondary air separating storehouse, and 3 divide storehouse for flue gas, and 4 be rotor, and 5 be hot junction First air/cigarette
Gas side fanning strip, 6 be hot junction First air/Secondary Air side fanning strip, and 7 be hot junction Secondary Air/fume side fanning strip, and 8 be cold end one
Secondary wind/fume side fanning strip, 9 be cold end First air/Secondary Air side fanning strip, 10 be cold end Secondary Air/fume side fanning strip, 11
For air preheater cold end, 12 be apex seal, and 13 be air preheater hot junction, and 14 be high-temperature blower, and 15 be Secondary Air circulation air path, 16
It is sealing sector plate for fan nozzle, 17,18 be slideway, and 19 be steam sootblower, and 20 be atomizing lance, and 21 store up for NaOH solution
Batch can, 22 be flow controller.
Specific implementation mode
With reference to example, present invention is further described in detail, and the present invention is not limited by the following examples.
Embodiment 1：
Rotary regenerative air preheater is a kind of equipment that large-sized station boiler heats air using the waste heat of back-end ductwork.
Typical rotary regenerative air preheater is as shown in Figure 1, critical piece includes：Wind separating bin 1, secondary air separating storehouse 2, flue gas divide storehouse
3, rotor 4, hot junction First air/fume side fanning strip 5, hot junction First air/Secondary Air side fanning strip 6, hot junction Secondary Air/fume side
Fanning strip 7, cold end First air/fume side fanning strip 8, cold end First air/Secondary Air side fanning strip 9, cold end Secondary Air/fume side
Fanning strip 10, apex seal 12.
Atomizing lance 20, Secondary Air circulation air path 15, high-temperature blower 14, sector spray are added on rotary regenerative air preheater
Mouth 16,
The atomizing lance is arranged close to the First air side of cold end First air/Secondary Air fanning strip, is stored up with NaOH solution
Batch can 21 is connected, and the Secondary Air circulation air path entrance is located at hot junction Secondary Air exit, and outlet is located at thermal wind sensor area,
It is connected with fan nozzle, high-temperature blower is provided on air duct.Spray gun tail portion is disposed with flow controller 22, can be according to air preheater
The emitted dose of pressure condition adjust automatically NaOH solution.
Flue gas is reverse flow with air, and flue gas flows through air preheater from top to bottom, and air flows through air preheater from bottom to top, because
This exhanst gas outlet is air preheater cold end 11 with air intake, is air preheater hot junction 13 at smoke inlet and air outlet slit.In rotor
There are a large amount of corrugated heat storage plates.The rotation direction of rotor is generally fume side -- Secondary Air side -- First air side, when rotor rotates
When, heat storage plate transfers heat to air by absorbing and storing heat when fume side when passing through air side, constantly with this
Cold air is heated on ground.
After improved air preheater system is as shown in Fig. 2, NaOH solution is atomized by the atomizing lance 20 in a wind separating bin
Spray to cold end ammonium hydrogen sulfate deposit.High-temperature blower draws the hot Secondary Air in part, and sector is entered behind circulation secondary air duct
Nozzle.Structure at fan nozzle is shown in that Fig. 3, nozzle install additional sealing together close to cold end Secondary Air/fume side fanning strip, the other side
Fanning strip, for reducing being in direct contact for hot wind and cold Secondary Air, since there are pressure difference, the heat of purging between cold and hot Secondary Air
Secondary Air still can be to leakage at cold Secondary Air, therefore 17 width of fanning strip installed additional should ensure that air preheater has one always in operation
Piece apex seal is located on fanning strip.
Fan nozzle bottom has the slideway of radial arrangement, steam sootblower 19 that can move back and forth along slideway 18.When rotor turns
When dynamic, NaOH solution after being sprayed in atomizing lance with the NH in deposit4HSO4It reacts, hot wind continuously purges air preheater
Cold end, the ammonium hydrogen sulfate in vapor deposition object, makes the deposit for being deposited on air preheater cold end surface become loose.For a period of time
Afterwards, steam sootblower brings into operation, and thoroughly removes the dust stratification on heat exchange element surface.
The above is only a preferred embodiment of the present invention, it should be noted that ordinary skill people for the art
For member, without departing from the technical principles of the invention, several improvements and modifications, these improvements and modifications can also be made
Also it should be regarded as protection scope of the present invention.
Claims (4)
1. for preventing the system that deposit blocks in rotary regenerative air preheater, rotary regenerative air preheater includes First air point
Storehouse, secondary air separating storehouse, flue gas divide storehouse, rotor, hot junction First air/fume side fanning strip, hot junction First air/Secondary Air side fan-shaped
Plate, hot junction Secondary Air/fume side fanning strip, cold end First air/fume side fanning strip, cold end First air/Secondary Air side fanning strip,
Cold end Secondary Air/fume side fanning strip, apex seal, it is characterised in that atomization spray is added on rotary regenerative air preheater
Rifle, Secondary Air circulation air path, high-temperature blower, fan nozzle,
The atomizing lance is arranged close to the First air side of cold end First air/Secondary Air fanning strip, with NaOH solution storage tank
It is connected, the Secondary Air circulation air path entrance is located at hot junction Secondary Air exit, and outlet is located at thermal wind sensor area, with sector
Nozzle is connected, and high-temperature blower is provided on air duct.
2. according to claim 1 for preventing the system that deposit blocks in rotary regenerative air preheater, feature exists
Steam sootblower is arranged inside the fan nozzle, the slideway of radial arrangement, soot blower energy are arranged at the bottom of steam sootblower
Moved back and forth along slideway according to pre-set programs.
3. according to claim 1 for preventing the system that deposit blocks in rotary regenerative air preheater, feature exists
It is located close to the Secondary Air side of cold end Secondary Air/flue gas fanning strip in the thermal wind sensor area.
4. according to claim 1 for preventing the system that deposit blocks in rotary regenerative air preheater, feature exists
It is disposed with flow controller in the spray gun tail portion, it can be according to the injection of the pressure condition adjust automatically NaOH solution of air preheater
Amount.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810441910.1A CN108534172A (en) | 2018-05-10 | 2018-05-10 | For preventing the system that deposit blocks in rotary regenerative air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810441910.1A CN108534172A (en) | 2018-05-10 | 2018-05-10 | For preventing the system that deposit blocks in rotary regenerative air preheater |
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| Publication Number | Publication Date |
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| CN108534172A true CN108534172A (en) | 2018-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810441910.1A Pending CN108534172A (en) | 2018-05-10 | 2018-05-10 | For preventing the system that deposit blocks in rotary regenerative air preheater |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118361A (en) * | 2019-04-16 | 2019-08-13 | 华电电力科学研究院有限公司 | A kind of five points of storehouse rotary regenerative air preheaters and its working method of anti-ammonium hydrogen sulfate deposition |
| CN111013377A (en) * | 2019-11-19 | 2020-04-17 | 华电电力科学研究院有限公司 | Independently adjustable anti-blocking structure and method for four-bin air preheater |
| CN113503556A (en) * | 2021-05-28 | 2021-10-15 | 大唐长春第三热电厂 | Heating and purging system for heat transfer element of independent bin-divided type air preheater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118361A (en) * | 2019-04-16 | 2019-08-13 | 华电电力科学研究院有限公司 | A kind of five points of storehouse rotary regenerative air preheaters and its working method of anti-ammonium hydrogen sulfate deposition |
| CN110118361B (en) * | 2019-04-16 | 2024-05-07 | 华电电力科学研究院有限公司 | Working method of five-bin rotary air preheater for preventing ammonium bisulfate deposition |
| CN111013377A (en) * | 2019-11-19 | 2020-04-17 | 华电电力科学研究院有限公司 | Independently adjustable anti-blocking structure and method for four-bin air preheater |
| CN113503556A (en) * | 2021-05-28 | 2021-10-15 | 大唐长春第三热电厂 | Heating and purging system for heat transfer element of independent bin-divided type air preheater |
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