CN106439779A - Device for preventing low-temperature corrosion of boiler air preheater - Google Patents
Device for preventing low-temperature corrosion of boiler air preheater Download PDFInfo
- Publication number
- CN106439779A CN106439779A CN201610881848.9A CN201610881848A CN106439779A CN 106439779 A CN106439779 A CN 106439779A CN 201610881848 A CN201610881848 A CN 201610881848A CN 106439779 A CN106439779 A CN 106439779A
- Authority
- CN
- China
- Prior art keywords
- pressure
- air
- air preheater
- low
- boiler
- Prior art date
- 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.)
- Pending
Links
- 238000005260 corrosion Methods 0.000 title claims abstract description 14
- 230000007797 corrosion Effects 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003245 coal Substances 0.000 claims abstract 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 29
- 239000003546 flue gas Substances 0.000 claims description 29
- 230000008676 import Effects 0.000 claims description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 239000002028 Biomass Substances 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 abstract 4
- 238000000926 separation method Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 19
- 238000000034 method Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001717 pathogenic effect Effects 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 206010030113 Oedema Diseases 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 208000035475 disorder Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes or flue ways
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- 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
-
- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention relates to the field of boiler air preheaters, in particular to a device for preventing low-temperature corrosion of a boiler air preheater, which can satisfy the requirement of separating primary and secondary air systems needed by a biomass boiler and is excellent in economic benefit. The device comprises a flue, an air channel, a deaerator and a boiler water feeding pipeline; a separation plate is arranged in the air channel for dividing into a primary air channel and a secondary air channel; a low-pressure air preheater and a high-pressure air preheater are arranged in the air channel in an intake direction in sequence; an inlet header of the low-pressure air preheater is communicated with a water outlet of the deaerator; an outlet header of the low-pressure air preheater is communicated with an inlet header of a low-pressure smoke heat exchanger; an outlet header of the low-pressure smoke heat exchanger is communicated with a water inlet of the deaerator; the boiler water feeding pipeline is divided into two ways: one way is directly communicated with a coal economizer, and the other way is communicated with an inlet header of the high-pressure air preheater; an outlet header of the high-pressure air preheater is communicated with an inlet header of a high-pressure smoke heat exchanger; and an outlet header of the high-pressure smoke heat exchanger is communicated with the coal economizer.
Description
Technical field
The present invention relates to boiler air preheater field, the dress of specially a kind of anti-boiler air preheater cold end corrosion
Put.
Background technology
The general mode to air heating has three kinds：I.e. flue gas air, steam heating air and water heating air,
In biomass straw boiler of power plant, the air preheater of boiler design is modal to be to be arranged in flue, is made using flue gas
Method for heating air dielectric.But because biomass fuel contains more alkali metal and chloride ion, easily to air preheat
Device causes cold end corrosion, and in order to solve this problem, it is empty that Patent No. CN200410086239.1 discloses a kind of feedwater heating
The method of gas, air preheater is placed in air channel, and the feedwater after heating is divided into two-way, and a road enters the cigarette being arranged in flue
Gas Cooler, is mixed with the feedwater of another road after flue gas and is directly entered in economizer, but this method air inlet is pre-
, regardless of First air and secondary wind, because biomass fuel moisture is big, impurity many, density is light for the air of hot device, general during its burning
It is both needed to using first and second independent wind system, and higher hot blast temperature cooperation efficiency of combustion can be higher, simple one-level is given
Though water heating also can improve hot blast temperature and reduce exhaust gas temperature, its economy is not strong, and its single air channel also cannot be by sky
Edema caused by disorder of QI becomes two bursts of independent air-supplies.
Content of the invention
In order to solve the above problems, the invention provides a kind of device of anti-boiler air preheater cold end corrosion, its energy
Enough meet the separate requirement of first and second wind system needed for biomass boiler, good in economic efficiency.
Its technical scheme is such：A kind of device of anti-boiler air preheater cold end corrosion, it includes flue, wind
Road, oxygen-eliminating device and boiler feedwater pipeline, are provided with dividing plate and are separated out an air channel and secondary air duct, described wind in described air channel
Sequentially it is disposed with low-pressure air preheater and pressure-air preheater along air intake direction, the entering of described low-pressure air preheater in road
Mouth header connects the outlet of described oxygen-eliminating device, and the outlet header of described low-pressure air preheater connects low pressure flue gas heat-exchange unit
Import header, the outlet header of described low pressure flue gas heat-exchange unit connects the water inlet of described oxygen-eliminating device, described boiler feedwater pipeline
It is divided into two-way, a road directly connects economizer, another road connects the import header of described pressure-air preheater, described high pressure is empty
The outlet header of air preheater connects the import header of high pressure flue gas heat-exchange unit, and the outlet header of described high pressure flue gas heat-exchange unit is even
Lead to described economizer, described high pressure flue gas heat-exchange unit and described low pressure flue gas heat-exchange unit are all arranged in described flue.
It is further characterized by：The import in a described air channel by First air interface connect primary air fan, described one
The outlet in secondary air channel connects bellows by First air interface, and the import of described secondary air duct connects two by secondary wind interface
Secondary blower fan, secondary wind interface connecting secondary bellows are passed through in the outlet of described secondary air duct；
Described pressure-air preheater, low-pressure air preheater and air channel are all hung in support beam；
It is provided with septum valve on the boiler feedwater pipeline described in a road being directly connected to described economizer；
Described oxygen-eliminating device connects the import header of described low-pressure air preheater, described low-pressure air preheating by low pressure feed water pump
It is provided with low pressure modulating valve between the outlet header of the import header of device and described low-pressure air preheater.
After the structure of the present invention, by two sets of feedwater heating air systems of high-low pressure, obtain higher thermal air temperature
Meanwhile, in air channel, the dividing plate of setting can solve the sealing in first and second air channel of different pressures well, makes mutual not shadow during operation
Ring, using feedwater heating air, proceed to flue by the cyclic process of flue gas again, reduce exhaust gas temperature, saved cost, prevent
Only there is cold end corrosion and stifled ash in Air Preheater Heating Surface, it is to avoid the boiler efficiency thus brought declines.
Brief description
Fig. 1 arranges schematic diagram for air preheater；
Fig. 2 is for A-A in Fig. 1 to sectional view；
Fig. 3 is low pressure water circulation system schematic diagram；
Fig. 4 is high-pressure feed water system schematic.
Specific embodiment
See Fig. 1, shown in Fig. 2, Fig. 3, Fig. 4, a kind of device of anti-boiler air preheater cold end corrosion, it includes flue one
16th, flue 2 20, air channel, oxygen-eliminating device 13 and boiler feedwater pipeline 22, is provided with dividing plate 23 and is separated out air channel 7 He in air channel
Secondary air duct 8, is sequentially disposed with low-pressure air preheater 1 and pressure-air preheater 2 along air intake direction in air channel, and low pressure is empty
The import header of air preheater 1 connects the outlet of oxygen-eliminating device 13, the outlet header connection low pressure flue gas of low-pressure air preheater 1
The import header of heat exchanger 5, the outlet header of low pressure flue gas heat-exchange unit 5 connects the water inlet of oxygen-eliminating device 13, boiler feedwater pipeline
22 are divided into two-way, and a road directly connects economizer, another road connects the import header of pressure-air preheater 2, and pressure-air is pre-
The outlet header of hot device 2 connects the import header of high pressure flue gas heat-exchange unit 19, the outlet header connection of high pressure flue gas heat-exchange unit 19
Economizer, high pressure flue gas heat-exchange unit 19 is arranged in flue 2 20, and low pressure flue gas heat-exchange unit 15 is all arranged in flue 1.
The import in air channel 7 connects primary air fan 3 by First air interface 5, and First air is passed through in the outlet in an air channel 7
Interface 5 connects bellows 9, and secondary wind interface 6 connecting secondary blower fan 4 is passed through in the import of secondary air duct 8, the going out of secondary air duct 8
Mouth passes through secondary wind interface 6 connecting secondary bellows 10.Pressure-air preheater 2, low-pressure air preheater 1 and air channel are all by hanging
Hang device 11 is hung in support beam 12.
It is provided with septum valve on the road boiler feedwater pipeline 22 being directly connected to economizer；21；Oxygen-eliminating device 13 leads to
Cross the import header that low pressure feed pump 14 connects low-pressure air preheater 1, the import header of low-pressure air preheater 1 is empty with low pressure
It is provided with low pressure modulating valve 18 between the outlet header of air preheater 1.
Low pressure feed water Principle of Process is as described below：From the low pressure feed water of oxygen-eliminating device 13, sent into by low pressure feed water pump 14
In the heating surface of low-pressure air preheater 1, to the low pressure flue gas heat-exchange unit 15 proceeding to after air heating in flue 1, thus inhale
Receive flue gas heat, heating feed temperature reduces exhaust gas temperature simultaneously.High negative by low pressure flue gas heat-exchange unit 15 feed temperature out
During lotus may saturation, for this need before returning to oxygen-eliminating device 13 by water separator 17 by soda pop carry out separate.Low
The feedwater of pressure air preheater 1 is imported and exported between loop, is provided with a low pressure modulating valve 18, can adjust feedwater by burden requirement
Amount, namely scalable outlet pathogenic wind-warm and flue-gas temperature.It is empty that hot-air after low-pressure air preheater 1 heating enters high pressure naturally
Air preheater 2.
High-pressure feed water Principle of Process is as described below：It is divided into two loops, a road entrance air channel from the high-pressure feed water of boiler
In pressure-air preheater 2, after to air heating, proceed to the high pressure flue gas heat-exchange unit 19 in flue 2 20, feedwater is by cigarette
It is mixed into economizer with the feedwater of another road after gas heating.Pressure-air preheater 2 is also classified into First air and secondary wind, once
Heated by high-pressure feed water in air channel 7 and secondary air duct 8.High-pressure feed water heating system as low pressure feed water heating system principle,
Simply the pressure of feedwater is different, does not also have the water circulation system of low pressure.In addition, on the feed water circuit entering economizer, it is also provided with
One septum valve 21, equally can adjust confluent by burden requirement, that is, adjust outlet pathogenic wind-warm and flue-gas temperature.Through high pressure
Hot-air after air preheater 2 heating respectively enters bellows 9 and secondary air box 10, is ultimately delivered to boiler and joins to fuel
Wind.
Claims (5)
1. a kind of device of anti-boiler air preheater cold end corrosion, it includes flue, air channel, oxygen-eliminating device and boiler feed pipe
Road is separated out an air channel and secondary air duct, along air intake in described air channel it is characterised in that being provided with dividing plate in described air channel
Direction is sequentially disposed with low-pressure air preheater and pressure-air preheater, the import header connection of described low-pressure air preheater
The outlet of described oxygen-eliminating device, the outlet header of described low-pressure air preheater connects the import header of low pressure flue gas heat-exchange unit,
The outlet header of described low pressure flue gas heat-exchange unit connects the water inlet of described oxygen-eliminating device, and described boiler feedwater pipeline is divided into two-way,
One tunnel directly connects economizer, another road connects the import header of described pressure-air preheater, described pressure-air preheater
Outlet header connect the import header of high pressure flue gas heat-exchange unit, the outlet header of described high pressure flue gas heat-exchange unit connects described province
Coal device, described high pressure flue gas heat-exchange unit and described low pressure flue gas heat-exchange unit are all arranged in described flue.
2. a kind of device of anti-boiler air preheater cold end corrosion according to claim 1 is it is characterised in that described one
The import in secondary air channel connects primary air fan by First air interface, and the outlet in a described air channel connects one by First air interface
Secondary bellows, secondary wind interface connecting secondary blower fan is passed through in the import of described secondary air duct, and the outlet of described secondary air duct passes through two
Secondary wind interface connecting secondary bellows.
3. a kind of device of anti-boiler air preheater cold end corrosion according to claim 1 is it is characterised in that described height
Pressure air preheater, low-pressure air preheater and air channel are all hung in support beam.
4. a kind of anti-boiler air preheater cold end corrosion according to claim 1 device it is characterised in that with described
It is provided with septum valve on the boiler feedwater pipeline described in a road that economizer is directly connected to.
5. a kind of device of anti-boiler air preheater cold end corrosion according to claim 1 is it is characterised in that described remove
Oxygen device connects the import header of described low-pressure air preheater, the inlet header of described low-pressure air preheater by low pressure feed water pump
It is provided with low pressure modulating valve between the outlet header of case and described low-pressure air preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610881848.9A CN106439779A (en) | 2016-10-10 | 2016-10-10 | Device for preventing low-temperature corrosion of boiler air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610881848.9A CN106439779A (en) | 2016-10-10 | 2016-10-10 | Device for preventing low-temperature corrosion of boiler air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106439779A true CN106439779A (en) | 2017-02-22 |
Family
ID=58172928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610881848.9A Pending CN106439779A (en) | 2016-10-10 | 2016-10-10 | Device for preventing low-temperature corrosion of boiler air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106439779A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397948A (en) * | 2019-07-11 | 2019-11-01 | 湖南大唐节能科技有限公司 | A kind of tubular air preheater anti-block apparatus |
| CN110513716A (en) * | 2019-09-25 | 2019-11-29 | 杨学让 | A kind of fin tubular air preheater |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2417388Y (en) * | 2000-05-12 | 2001-01-31 | 上海华力燃烧设备有限公司 | Non low temp. corrosion type air preheater |
| US6439170B1 (en) * | 2000-12-12 | 2002-08-27 | Alstom Power N.V. | Single seam duct corner |
| CN2541809Y (en) * | 2002-04-08 | 2003-03-26 | 王顺昌 | Energy saving device to utilize and recover multiple afterheat source |
| CN1619246A (en) * | 2004-10-28 | 2005-05-25 | 龙基电力有限公司 | A Method for Avoiding Low Temperature Corrosion of Boiler Air Preheater |
| CN203375426U (en) * | 2013-06-09 | 2014-01-01 | 中船重工（上海）新能源有限公司 | Boiler tail structure capable of preventing boiler low-temperature air preheater from low-temperature corrosion |
| CN206176337U (en) * | 2016-10-10 | 2017-05-17 | 无锡华光锅炉股份有限公司 | Prevent boiler air heater low temperature corrosion's device |
-
2016
- 2016-10-10 CN CN201610881848.9A patent/CN106439779A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2417388Y (en) * | 2000-05-12 | 2001-01-31 | 上海华力燃烧设备有限公司 | Non low temp. corrosion type air preheater |
| US6439170B1 (en) * | 2000-12-12 | 2002-08-27 | Alstom Power N.V. | Single seam duct corner |
| CN2541809Y (en) * | 2002-04-08 | 2003-03-26 | 王顺昌 | Energy saving device to utilize and recover multiple afterheat source |
| CN1619246A (en) * | 2004-10-28 | 2005-05-25 | 龙基电力有限公司 | A Method for Avoiding Low Temperature Corrosion of Boiler Air Preheater |
| CN203375426U (en) * | 2013-06-09 | 2014-01-01 | 中船重工（上海）新能源有限公司 | Boiler tail structure capable of preventing boiler low-temperature air preheater from low-temperature corrosion |
| CN206176337U (en) * | 2016-10-10 | 2017-05-17 | 无锡华光锅炉股份有限公司 | Prevent boiler air heater low temperature corrosion's device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110397948A (en) * | 2019-07-11 | 2019-11-01 | 湖南大唐节能科技有限公司 | A kind of tubular air preheater anti-block apparatus |
| CN110513716A (en) * | 2019-09-25 | 2019-11-29 | 杨学让 | A kind of fin tubular air preheater |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170222 |
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| RJ01 | Rejection of invention patent application after publication |