CN109163351A - Solve the air preheater composite structure of blocking etching problem - Google Patents
Solve the air preheater composite structure of blocking etching problem Download PDFInfo
- Publication number
- CN109163351A CN109163351A CN201811210228.8A CN201811210228A CN109163351A CN 109163351 A CN109163351 A CN 109163351A CN 201811210228 A CN201811210228 A CN 201811210228A CN 109163351 A CN109163351 A CN 109163351A
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- air
- water
- steam
- water inlet
- air heater
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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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- 238000005530 etching Methods 0.000 title claims abstract description 11
- 230000000903 blocking effect Effects 0.000 title claims abstract description 10
- 239000002131 composite material Substances 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 106
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 241000208125 Nicotiana Species 0.000 claims abstract description 24
- 235000002637 Nicotiana tabacum Nutrition 0.000 claims abstract description 24
- 230000001172 regenerating effect Effects 0.000 claims abstract description 15
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 239000002253 acid Substances 0.000 abstract description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 239000004071 soot Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 208000001034 Frostbite Diseases 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005406 washing Methods 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)
- Chimneys And Flues (AREA)
- Air Supply (AREA)
Abstract
The present invention solves the air preheater composite structure of blocking etching problem, and air preheater has high temperature section and middle-temperature section, does not contain low-temperature zone；It is connected with heat medium water First air steam air heater between primary air fan and air preheater, heat medium water Secondary Air steam air heater is connected between secondary air fan and air preheater, heating agent shredded tobacco for water pipes cooler is connected between air preheater and deduster；Heating agent shredded tobacco for water pipes cooler has outlet pipe and water inlet pipe, and outlet pipe is divided into the water inlet of First air steam air heater water inlet pipe connection heat medium water First air steam air heater and the water inlet of Secondary Air steam air heater water inlet pipe connection heat medium water Secondary Air steam air heater；The water outlet of heat medium water First air steam air heater, which is summarized by First air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler, and the water outlet of heat medium water Secondary Air steam air heater, which is summarized by Secondary Air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler.The present invention can completely avoid rotary regenerative air preheater corrosion as caused by acid and ammonium hydrogen sulfate and stifled ash, and ensure that boiler efficiency is constant.
Description
Technical field
The present invention relates to a kind of air preheater composite structures for solving blocking etching problem.
Background technique
Fig. 1 is a kind of conventional air preheater dependency structure schematic diagram, and boiler 1 connects rotary regenerative air preheater 2, empty
Air preheater 2 is connected to deduster 3, and air preheater 2 connects primary air fan 4 and secondary air fan 5, and air preheater has high temperature
Section 21, middle-temperature section 22 and low-temperature zone 23.
Rotary regenerative air preheater is for air needed for the flue gas heat of economizer exit is passed to boiler combustion
The important heat exchange equipment of modern medium-and-large-sized coal-fired power station boiler.In order to improve boiler efficiency, according to coal quality condition, air preheater outlet
Exhaust gas temperature general control is between 120 DEG C~150 DEG C.The corrosion of air preheater low-temperature zone and stifled ash are running common problems,
Boiler efficiency is not only reduced, blower power consumption can also be caused to increase, even causes fan stall when stifled grey serious.
The main reason for corrosion of air preheater low-temperature zone and stifled ash, first is that the sulfuric acid vapor in flue gas condenses in changing for low-temperature zone
Cause on thermal element, second is that SO in the escape ammonia and flue gas in SCR denitration process3Heat exchange of the ammonium hydrogen sulfate of generation in low-temperature zone
Condensation causes on element.No matter liquid sulfuric acid or liquid sulfuric acid hydrogen ammonium, be deposited on heat exchange element, other than corrosivity, also
The dust in flue gas can be adhered to, air preheater is caused to block, the viscosity of ammonium hydrogen sulfate is stronger.
According to present research, between substantially 150 DEG C~200 DEG C of temperature range that ammonium hydrogen sulfate condenses, this temperature
Section is more taller than the adiabatic condensation temperature of sulfuric acid vapor.The operation of rotary regenerative air preheater is can not to avoid this temperature range
, therefore, the design of air preheater can not effectively avoid low-temperature zone from corroding and block up ash, can only take measures, and slow down corrosion hair
It is raw, mitigate chocking-up degree.Common technological means are as follows: 1) air preheater heat exchange element step-by-step arrangement, i.e. high temperature section, middle-temperature section and low
Temperature section (can also high middle-temperature section merge setting), and increase low-temperature zone heat exchange element length, keep the crystallizing field of ammonium hydrogen sulfate complete
Cold section is fallen in, hydrogen sulfate ammonium precipitation product area segmentation is avoided.In engineering, low-temperature zone height is generally 1000mm or so.2) using conjunction
The cold section of heat accumulating element template and material of reason.3) effective cleaning device etc. is arranged in air preheater.
But above-mentioned means cannot tackle the problem at its root.
Summary of the invention
Technical problem solved by the invention is providing a kind of brand new, can completely avoid rotary air preheat
Device corrosion as caused by acid and ammonium hydrogen sulfate and stifled ash, and ensure that boiler efficiency is constant, exhaust gas temperature can in a certain range
Fine tune.
The technology used in the present invention means are as described below.
A kind of air preheater composite structure solving blocking etching problem, boiler connects rotary regenerative air preheater, empty
Air preheater is connected to deduster, and air preheater connects primary air fan and secondary air fan, air preheater have high temperature section and
Middle-temperature section does not contain low-temperature zone；Heat medium water First air steam air heater, secondary air fan are connected between primary air fan and air preheater
It is connected with heat medium water Secondary Air steam air heater between air preheater, heating agent shredded tobacco for water pipes is connected between air preheater and deduster
Cooler；Heating agent shredded tobacco for water pipes cooler has outlet pipe and water inlet pipe, and outlet pipe is divided into First air steam air heater water inlet pipe connection heat medium water one
The water inlet of water inlet and Secondary Air steam air heater water inlet pipe the connection heat medium water Secondary Air steam air heater of secondary wind steam air heater；Heating agent
The water outlet of water First air steam air heater, which is summarized by First air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler, heating agent
The water outlet of water Secondary Air steam air heater, which is summarized by Secondary Air steam air heater outlet pipe to water inlet pipe, connects heating agent shredded tobacco for water pipes cooler.
Outlet pipe connects auxiliary steam heating before being divided into First air steam air heater water inlet pipe and Secondary Air steam air heater water inlet pipe
Device.
Heat medium water frequency conversion is arranged in water inlet pipe after First air warm wind heating outlet pipe and Secondary Air steam air heater outlet pipe summarize
Pump
It is had the beneficial effect that caused by the present invention.
The present invention solves rotary regenerative air heater blocking, etching problem, and the reluctant burn into of rotary regenerative air heater
Stifled ash problem has been transferred to the relatively easy heating agent shredded tobacco for water pipes cooler for solving problems, is convenient to clean maintenance.
Detailed description of the invention
Fig. 1 is conventional air preheater dependency structure schematic diagram.
Fig. 2 is dependency structure schematic diagram of the invention.
Specific embodiment
A kind of air preheater composite structure for solving blocking etching problem of the present invention, boiler 1 are connected by pipeline and are turned round
Regenerative air heater 2, air preheater 2 are connected to deduster 3 by pipeline, and air preheater 2 connects primary air fan 4 and secondary
Blower 5, focuses on, and air preheat utensil 2 has high temperature section 21 and middle-temperature section 22, does not contain low-temperature zone.
Heat medium water First air steam air heater 6 is connected between primary air fan 4 and air preheater 2, secondary air fan 5 and air are pre-
It is connected with heat medium water Secondary Air steam air heater 7 between hot device 2, heating agent shredded tobacco for water pipes cooler is connected between air preheater 2 and deduster 3
8。
Heating agent shredded tobacco for water pipes cooler 8 have outlet pipe 81 and water inlet pipe 82, outlet pipe 81 rear end be divided into First air steam air heater into
Water pipe 811 connects the water inlet of heat medium water First air steam air heater 6 and Secondary Air steam air heater water inlet pipe 812 connects heat medium water two
The water inlet of secondary wind steam air heater 7；The water outlet of heat medium water First air steam air heater 6 is summarized by First air steam air heater outlet pipe 821
Heating agent shredded tobacco for water pipes cooler 8 is connected to water inlet pipe 82, the water outlet of heat medium water Secondary Air steam air heater 7 passes through Secondary Air steam air heater outlet pipe
822 summarize to the connection heating agent shredded tobacco for water pipes cooler 8 of water inlet pipe 82.
Outlet pipe 81 divides to connect auxiliary before First air steam air heater water inlet pipe 811 and Secondary Air steam air heater water inlet pipe 812
Steam heater 9.
Heat is arranged in water inlet pipe 82 after First air warm wind heating outlet pipe 821 and Secondary Air steam air heater outlet pipe 822 summarize
Matchmaker's water variable frequency pump 10.
In the present specification, Ty1, Ty2, Ty3 respectively indicate high temperature section, middle-temperature section and the low-temperature zone of rotary regenerative air heater
Exit gas temperature, low-temperature zone here is the low-temperature zone in conventional air preheater.It is rotary to guarantee when the present invention is implemented
Air preheater does not occur to corrode and block up ash, and outlet exhaust gas temperature (Ty2) is it is ensured that the wall temperature of middle-temperature section heat exchange element is higher than sulfuric acid
Hydrogen ammonium adiabatic condensation temperature, and there are appropriate allowance, Ty2 is calculated by concrete engineering condition and is determined.
The present invention is to ensure that boiler efficiency does not reduce, and heat medium water heat-exchange system is (primary comprising heating agent shredded tobacco for water pipes cooler, heat medium water
Wind steam air heater and heat medium water Secondary Air steam air heater) capacity should be with novel rotary type air preheater middle-temperature section exit gas temperature
(Ty2) be used as its inlet temperature, using conventional rotary regenerative air heater low-temperature zone exit gas temperature (Ty3) as its outlet temperature into
Row type selecting, and there are appropriate allowance, Ty3 is calculated by concrete engineering condition and is determined.
The present invention uses heat medium water frequency conversion pump group, and the adjustment of heating agent water may be implemented in the revolving speed by adjusting pump, in turn
Realize the adjusting (meeting low as far as possible under security situation) of heating agent shredded tobacco for water pipes cooler exit gas temperature Ty3, and then can be in full load
Ensure high efficiency boiler rate in range, cooperation auxiliary steam heating device can ensure novel rotary type air within the scope of full load
Preheater middle-temperature section wall temperature is higher than ammonium hydrogen sulfate adiabatic condensation temperature.
The auxiliary steam heating device, main function are as follows: 1) the initial water temperature needed to establish heating agent water system；
2) for preventing heat medium water heat-exchange system frostbite during winter operation/stoppage in transit；3) (winter operation, coal varitation, equipment when necessary
Type selecting allowance deficiency etc.), to improve novel rotation regenerative air heater middle-temperature section wall temperature, coagulated with guaranteeing not occurring ammonium hydrogen sulfate
Knot.
Heating agent shredded tobacco for water pipes cooler operating condition is severe, can be using mature anticorrosion, anti-wear, anti-clogging technology, such as: 1)
Abrasionproof false tube is arranged in cigarette cooler entrance；2) heat exchanger tube uses H-type finned tube；3) cigarette cooler outlet section heat exchanger tube is (containing fin, branch
Fagging etc.) it uses and crosses enamel processing；4) efficient soot blower etc. is arranged in heating agent shredded tobacco for water pipes cooler.These technological means are in active service unit
On have the experience and achievement of successful operation.
Heat medium water steam air heater works in environment corrosion-free, without wearing, without risk is blocked, is using routine techniques production
Can, it is the mature equipment on boiler controller system.
The present invention is substantially that the stifled grey problem of conventional rotary regenerative air preheater low-temperature zone burn into has been transferred to opposite appearance
It easily solves to block, on the heating agent shredded tobacco for water pipes cooler of etching problem.
In the stifled grey problem of processing burn into, rotary regenerative air heater relative difficulty, soot blowing effect is difficult to ensure.The reason is as follows that:
1) soot blower is arranged on the cold and hot end flue of air preheater, and soot blower is opposite transport with air preheater heat exchange element
Dynamic relationship causes sootblowing dielectric (superheated steam or high-pressure washing water) cannot be with most appropriate angle and whole energy effects
Onto heat exchange element, soot blowing effect is had a greatly reduced quality；2) soot blower can only be arranged on the cold and hot end flue of air preheater, be blown
The energy of grey medium is unevenly distributed in the whole height of heat exchange element, i.e., heat exchange element deashing remoter from cool and heat ends is more tired
It is difficult.Root is it was found that ammonium hydrogen sulfate coagulation region is away between preheater low-temperature zone heat transfer element bottom about 380mm~810mm.Cause
This, the structure of existing rotary regenerative air heater causes soot blowing ineffective.
Heating agent shredded tobacco for water pipes cooler is relatively easy in the stifled grey problem of processing burn into.Since heating agent shredded tobacco for water pipes cooler is directly arranged at
On flue, and it is static equipment, is taking necessary anticorrosion, in anti-wear, anti-clogging technical foundation, soot blower is cold with cigarette
Device heat exchange element is opposing stationary, and soot blower flexible arrangement, can accomplish to blow it is complete, blow through, it is ensured that ash-removal effect.
Claims (3)
1. a kind of air preheater composite structure for solving blocking etching problem, boiler connect rotary regenerative air preheater, air
Preheater is connected to deduster, and air preheater connects primary air fan and secondary air fan, which is characterized in that air preheater has
High temperature section and middle-temperature section do not contain low-temperature zone；Heat medium water First air steam air heater is connected between primary air fan and air preheater,
It is connected with heat medium water Secondary Air steam air heater between secondary air fan and air preheater, is connected between air preheater and deduster
Heating agent shredded tobacco for water pipes cooler；Heating agent shredded tobacco for water pipes cooler has outlet pipe and water inlet pipe, and outlet pipe is divided into the connection of First air steam air heater water inlet pipe
The water inlet of water inlet and Secondary Air steam air heater water inlet pipe the connection heat medium water Secondary Air steam air heater of heat medium water First air steam air heater
Mouthful；The water outlet of heat medium water First air steam air heater is summarized cold to water inlet pipe connection heating agent shredded tobacco for water pipes by First air steam air heater outlet pipe
Device, the water outlet of heat medium water Secondary Air steam air heater are summarized cold to water inlet pipe connection heating agent shredded tobacco for water pipes by Secondary Air steam air heater outlet pipe
Device.
2. the air preheater composite structure as described in claim 1 for solving blocking etching problem, which is characterized in that outlet pipe
Auxiliary steam heating device is connected before being divided into First air steam air heater water inlet pipe and Secondary Air steam air heater water inlet pipe.
3. the air preheater composite structure as claimed in claim 1 or 2 for solving blocking etching problem, which is characterized in that one
Heat medium water variable frequency pump is arranged in water inlet pipe after secondary air-heating air-heating gas outlet pipe and Secondary Air steam air heater outlet pipe summarize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811210228.8A CN109163351A (en) | 2018-10-17 | 2018-10-17 | Solve the air preheater composite structure of blocking etching problem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811210228.8A CN109163351A (en) | 2018-10-17 | 2018-10-17 | Solve the air preheater composite structure of blocking etching problem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109163351A true CN109163351A (en) | 2019-01-08 |
Family
ID=64878535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811210228.8A Pending CN109163351A (en) | 2018-10-17 | 2018-10-17 | Solve the air preheater composite structure of blocking etching problem |
Country Status (1)
| Country | Link |
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| CN (1) | CN109163351A (en) |
Cited By (2)
| 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 |
| CN113877731A (en) * | 2021-09-22 | 2022-01-04 | 安徽金轩科技有限公司 | Method for preventing low-temperature section from blocking and scaling of air preheater of circulating fluidized bed boiler |
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| CN207006217U (en) * | 2017-06-27 | 2018-02-13 | 华能山东发电有限公司 | A kind of water-borne formula extension air preheater system |
| CN209295183U (en) * | 2018-10-17 | 2019-08-23 | 中国电力工程顾问集团华北电力设计院有限公司 | Solve the air preheater composite structure of blocking etching problem |
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2018
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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 |
| 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 |
| CN113877731A (en) * | 2021-09-22 | 2022-01-04 | 安徽金轩科技有限公司 | Method for preventing low-temperature section from blocking and scaling of air preheater of circulating fluidized bed boiler |
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