CN107906554A - A kind of air preheater flue anti-corrosion method - Google Patents
A kind of air preheater flue anti-corrosion method Download PDFInfo
- Publication number
- CN107906554A CN107906554A CN201711005155.4A CN201711005155A CN107906554A CN 107906554 A CN107906554 A CN 107906554A CN 201711005155 A CN201711005155 A CN 201711005155A CN 107906554 A CN107906554 A CN 107906554A
- Authority
- CN
- China
- Prior art keywords
- air
- air preheater
- preheater
- corrosion method
- inlet
- 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.)
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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
- F23L15/04—Arrangements of recuperators
- F23L15/045—Arrangements of recuperators using intermediate heat-transfer fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/01—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using means for separating solid materials from heat-exchange fluids, e.g. filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
-
- 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
Abstract
The present invention relates to a kind of air preheater flue anti-corrosion method, the air outlet of air-supply arrangement is connected with the air air inlet of air preheater, the air air outlet of air preheater is connected with hot Media Oven, the present invention connects the air air outlet of air preheater with the air inlet of air-supply arrangement, and the temperature interlocked control of the air mass flow of Connectivity Section and the air air inlet of air preheater.A kind of air preheater flue anti-corrosion method of the present invention, the intake air temperature of air preheater can effectively be adjusted, effectively reduce the dust stratification dew condensation phenomenon of air preheater tubulation tube wall, favorable anti-corrosion effect, so as to further increase the operational reliability and the thermal efficiency of boiler, there are fabulous economic value and promotional value.
Description
Technical field
The invention belongs to field of thermal power, and in particular to a kind of air preheater flue anti-corrosion method.
Background technology
In traditional heating agent workshop, the high-temperature flue gas that coal-fired heating agent heating furnace produces after being discharged in stove by entering waste heat pot
Stove, enters back into air preheater, then by ceramic multicyclone dust collector and water dust scrubber dedusting after, enter through air-introduced machine de-
Sulphur tower, is finally introducing chimney, is discharged into air, in addition, in the process, also having cold air and being sent into air preheat via air blower
Device, enters coal furnace burner hearth as combustion air after heated.
In heating agent workshop, the temperature that steam starts to condense is known as dew point, and the dew point of water vapour is known as water dew in usual flue gas
Point, the dew point of sulfureous in flue gas acid vapor are known as acid dew point.Water dew point depends on partial pressure of the water vapour in flue gas, generally
30-60 DEG C, even if moisture in coal is very big, water dew point is also no more than 66 DEG C in flue gas.However, in the combustion process of fuel,
Sulphur in fuel can generate sulfur dioxide after combustion, wherein there is a small amount of sulfur dioxide further to aoxidize and form three oxygen again
Change sulphur, sulfur trioxide exists in flue gas then can raise the dew-point temperature of flue gas, i.e. water vapour in sulfur trioxide and flue gas
Chemical combination, generates sulfuric acid vapor, and dew-point temperature greatly raises.Heating agent workshop frequently with air preheater be tube side formula air preheat
Device, tube side regenerative air heater are in cube more, its main heat transfer component is thin-wall steel tube, and vertical interlaced is arranged between steel pipe
Row, both ends are welded on lower perforated plate.Tube side regenerative air heater is equipped with sagging plate in bobbin carriage, and flue gas is above and below steel pipe
By air preheater, air then laterally across air preheater, completes heat conduction.When the flue gas containing sulfuric acid vapor flows through
Air preheater low temperature heating surface, when wall temperature of heated surface is near or below flue gas dew point, the sulfuric acid vapor in flue gas will be in wall
Condense and corrosion is produced to wall, while the flying dust in flue gas is easily adhered to by the acid solution on wall and is formed and deposited, in dust stratification
Metal oxide and acid liquid reaction can generate hydraulicity sulfate, cause dust stratification to harden, form the low temperature for being difficult to remove and glue product
Ash.The low temperature of air preheater, which glues dust stratification, makes the flow area of air preheater pipeline constantly reduce so that wall erosion and product
Ash is further exacerbated by, and produces vicious circle, is ultimately resulted in air preheater and is produced serious metal erosion and stifled ash, makes flue gas through-flow
Resistance increase, deficiency in draught, has directly influenced boiler operatiopn reliability and the thermal efficiency.Therefore, run in air preheater
During, low temperature inlet air causes the dust particle in flue gas to adhere to being easy to form condensation at high-temperature flue gas heat exchange
On tube wall, cause tubulation to block, while know from experience etching apparatus containing sulfur dioxide gas in flue gas, have one to boiler normal operation
It is fixing to ring.
Therefore, studying a kind of air preheater flue anti-corrosion method that can effectively reduce pipeline condensation dust stratification has
Highly important meaning.
The content of the invention
The purpose of the present invention is to solve the easy dust stratification condensation of air preheater pipeline in the prior art to cause asking for corrosion
A kind of topic, there is provided air preheater flue anti-corrosion method that can effectively reduce pipeline condensation dust stratification.
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of air preheater flue anti-corrosion method, the air outlet of air-supply arrangement and the air inlet air of air preheater
Mouth connection, the air air outlet of air preheater is connected with hot Media Oven, by the air air outlet and air-supply arrangement of air preheater
Air inlet connection, and the temperature interlocked control of the air mass flow of Connectivity Section and the air air inlet of air preheater.
As preferable technical solution：
A kind of air preheater flue anti-corrosion method as described above, the air preheater use shell-and-tube knot
Structure, flue gas walk tube side, and air walks shell side.
A kind of air preheater flue anti-corrosion method as described above, the air preheater shell side inner bottom plating pour
Cement layer, the thickness of the cement layer is 12 centimeters.Since flue gas flow rate is relatively low herein, it is easy at bottom plate because cold air cools down
And condense, corrode tubulation weld seam, and cause tubulation import to be blocked because condensing, sticking dust.High temperature resistant cement is changed in flue gas
Play insulation effect in the junction of air preheater bottom plate and cold air after heat so that the bottom temperature difference of air preheater subtracts
It is few, so as to reduce the coagulation of appearance so that ventilation is sufficient in tubulation, so as to extend tubulation service life, reduces maintenance cost.
A kind of air preheater flue anti-corrosion method as described above, the air-supply arrangement is air blower.The present invention
In air-supply arrangement include but not limited to this, be only to include common air-supply arrangement herein.
A kind of air preheater flue anti-corrosion method as described above, the air air outlet of the air preheater with
The air inlet of air blower is connected by bypass pipe, and installation bypass pneumatic operated valve, bypasses pneumatic operated valve and blower inlet on bypass pipe
The temperature detector at place is electrically connected, and the temperature that the temperature detector at blower inlet detects is air preheater
The temperature of air air inlet, sends after temperature detector detection temperature to control system, control system adjustment bypass pneumatic operated valve
Valve opening, and then adjust bypass pipe in air mass flow.
A kind of air preheater flue anti-corrosion method as described above, the air inlet joint noise reduction of the air blower
Device device.Can effective noise reduction function pollution, give the comfortable working environment of practitioner.
A kind of air preheater flue anti-corrosion method as described above, the air inlet of the air blower are carried out by filter pulp
Parcel, it is therefore an objective to cross air filtering, reduce cold wind and enter, steady pressure, improves air preheater inlet air temperature, alleviates tubulation condensation
Clogging phenomenon, extends air preheater service life, saves maintenance cost.
A kind of air preheater flue anti-corrosion method as described above, the output control and air of the air blower are pre-
Blast pressure interlocked control at the air air outlet of hot device.Purpose is to be controlled by air blower output size outside air preheater
Blast pressure size.
A kind of air preheater flue anti-corrosion method as described above, at the air air outlet of the air preheater
Blast pressure and the fire grate revolution output interlocked control in hot Media Oven.Stable fire grate is reached by this procedure control unit system
The effect of load, ensure that in boiler and stablizes burning, improve efficiency of combustion, energy-saving.
Beneficial effect：
(1) a kind of air preheater flue anti-corrosion method of the invention, can effectively adjust air preheater into
Draught temperature, effectively reduces the dust stratification dew condensation phenomenon of air preheater tubulation tube wall, favorable anti-corrosion effect, so as to further increase
The operational reliability and the thermal efficiency of boiler, there is fabulous economic value and promotional value；
(2) a kind of air preheater flue anti-corrosion method of the invention, the cement layer energy poured in air preheater
Insulation effect is enough played, reduces the bottom temperature difference of air preheater, so as to reduce the coagulation of appearance so as to lead in tubulation
Wind is sufficient, so as to extend tubulation service life, reduces the maintenance cost of tubulation.
Brief description of the drawings
Fig. 1 is the air preheater pipeline connection diagram of the present invention；
Wherein, 1- air preheaters, 2- air blowers, 3- mufflers, 4- filter pulps, 5- flues, 6- bypass pipes, 7- pour water
Mud, 8- fire grates.
Embodiment
The invention will be further elucidated with reference to specific embodiments.It is to be understood that these embodiments are merely to illustrate this hair
It is bright rather than limit the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, art technology
Personnel can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Fixed scope.
Embodiment 1
A kind of air preheater flue anti-corrosion method, as shown in Figure 1, the air outlet of air blower 2 and air preheater 1
The connection of air air inlet, the air air outlet of air preheater 1 connects with hot Media Oven, the air air outlet of air preheater 1
Connected with the air inlet of air blower 2 by bypass pipe 6, and the air mass flow of Connectivity Section and the air air inlet of air preheater 1
The temperature interlocked control at place, installation bypass pneumatic operated valve, bypass pneumatic operated valve and the temperature of 2 air inlet of air blower wherein on bypass pipe 6
Detector is spent to be electrically connected；
Wherein, air preheater 1 is tube side regenerative air heater, and air preheater 1 uses tube shell type structure, and flue gas walks pipe
The flue 5 of journey, air walks shell side.1 shell side inner bottom plating of air preheater also pours the cement layer 7 that thickness is 12 centimeters, and air is pre-
The fire grate revolution output interlocked control of blast pressure and the fire grate 8 in hot Media Oven at the air air outlet of hot device 1；
The air inlet of air blower 2 is wrapped up by filter pulp 4 and is also associated with muffler assembly 3, air blower 2 in air inlet
Output control and 1 air air outlet of air preheater at blast pressure interlocked control.
The dust stratification dew condensation phenomenon for being effectively reduced air preheater tubulation tube wall of the method for the present invention, favorable anti-corrosion effect,
Tubulation service life can effectively be extended.
Comparative example 1
A kind of air preheater flue connection method, air preheater structure and connecting pipe substantially with embodiment 1,
Difference is, is not connected between the air air outlet and the air inlet of air blower of air preheater.Obtained by comparative example 1
Flue be the flue before transformation, the flue obtained by embodiment 1 is flue after transformation, by right
Will become apparent from anti-corrosion effect than hot air temperature before and after transformation notable, June 23 to July 19 in 2016, hot-air temperature before transformation
Spend and be：102.8、102.0、102.0、101.3、102.6、100.3、97.2、97.5、97.0、97.8、98.0、96.9、96.0、
95.4th, 95.8,96.6,96.1,95.9,98.7,98.2,96.1,97.2,94.8,94.4,93.0,93.3,91.2, unit：
℃；After transformation on May 16th, 2017 be to hot air temperature on June 11：102.1、102.2、104.4、105.9、104.8、
102.2、102.5、100.6、103.5、100.0、102.0、102.2、105.0、103.0、102.9、102.2、102.2、
102.8th, 100.3,102.4,104.9,103.5,102.0,105.4,105.8,105.0,105.5, unit：℃.Same sets
Continuous operation hot air temperature change in 27 days, the latter can find out that hot air temperature does not decline proof anti-corrosion effect before and after standby transformation
It is good.
Claims (9)
1. a kind of air preheater flue anti-corrosion method, the air outlet of air-supply arrangement and the air air inlet of air preheater
Connection, the air air outlet of air preheater are connected with hot Media Oven, it is characterized in that：By the air air outlet of air preheater with sending
The air inlet connection of wind apparatus, and the interlocking control of the temperature of the air mass flow of Connectivity Section and the air air inlet of air preheater
System.
2. a kind of air preheater flue anti-corrosion method according to claim 1, it is characterised in that the air is pre-
Hot device uses tube shell type structure, and flue gas walks tube side, and air walks shell side.
3. a kind of air preheater flue anti-corrosion method according to claim 2, it is characterised in that the air is pre-
Hot device shell side inner bottom plating joints cement layer, the thickness of the cement layer is 12 centimeters.
A kind of 4. air preheater flue anti-corrosion method according to claim 1, it is characterised in that the air-supply dress
It is set to air blower.
5. a kind of air preheater flue anti-corrosion method according to claim 4, it is characterised in that the air is pre-
The air air outlet of hot device is connected with the air inlet of air blower by bypass pipe, and installation bypass pneumatic operated valve, bypasses gas on bypass pipe
Dynamic valve is electrically connected with the temperature detector at blower inlet.
A kind of 6. air preheater flue anti-corrosion method according to claim 5, it is characterised in that the air blower
Air inlet joint noise reduction device device.
A kind of 7. air preheater flue anti-corrosion method according to claim 6, it is characterised in that the air blower
Air inlet wrapped up by filter pulp.
A kind of 8. air preheater flue anti-corrosion method according to claim 4, it is characterised in that the air blower
Output control and air preheater air air outlet at blast pressure interlocked control.
9. a kind of air preheater flue anti-corrosion method according to claim 4, it is characterised in that the air is pre-
Blast pressure and the fire grate revolution output interlocked control in hot Media Oven at the air air outlet of hot device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005155.4A CN107906554A (en) | 2017-10-25 | 2017-10-25 | A kind of air preheater flue anti-corrosion method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711005155.4A CN107906554A (en) | 2017-10-25 | 2017-10-25 | A kind of air preheater flue anti-corrosion method |
Publications (1)
| Publication Number | Publication Date |
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| CN107906554A true CN107906554A (en) | 2018-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711005155.4A Pending CN107906554A (en) | 2017-10-25 | 2017-10-25 | A kind of air preheater flue anti-corrosion method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200975848Y (en) * | 2006-11-14 | 2007-11-14 | 高玉明 | Inner heat insulation high-temperature tubular heat-exchange facility |
| CN201163156Y (en) * | 2007-08-01 | 2008-12-10 | 江苏宏图洁环保工程设备有限公司 | Combined high temperature air preheater |
| CN201462895U (en) * | 2009-07-01 | 2010-05-12 | 四平市东海石化设备制造有限公司 | Antiseptic wearable air pre-heater |
| CN203857479U (en) * | 2014-05-26 | 2014-10-01 | 河南双信炭黑有限公司 | Air inlet device on tail gas waste heat power generation boiler |
| CN105276607A (en) * | 2014-05-26 | 2016-01-27 | 河南双信炭黑有限公司 | Air inlet device on tail gas waste heat power generation boiler |
| CN205227381U (en) * | 2015-11-09 | 2016-05-11 | 营口康辉石化有限公司 | Chain formula grate coal fired boiler prevents stifled air preheater control unit |
-
2017
- 2017-10-25 CN CN201711005155.4A patent/CN107906554A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200975848Y (en) * | 2006-11-14 | 2007-11-14 | 高玉明 | Inner heat insulation high-temperature tubular heat-exchange facility |
| CN201163156Y (en) * | 2007-08-01 | 2008-12-10 | 江苏宏图洁环保工程设备有限公司 | Combined high temperature air preheater |
| CN201462895U (en) * | 2009-07-01 | 2010-05-12 | 四平市东海石化设备制造有限公司 | Antiseptic wearable air pre-heater |
| CN203857479U (en) * | 2014-05-26 | 2014-10-01 | 河南双信炭黑有限公司 | Air inlet device on tail gas waste heat power generation boiler |
| CN105276607A (en) * | 2014-05-26 | 2016-01-27 | 河南双信炭黑有限公司 | Air inlet device on tail gas waste heat power generation boiler |
| CN205227381U (en) * | 2015-11-09 | 2016-05-11 | 营口康辉石化有限公司 | Chain formula grate coal fired boiler prevents stifled air preheater control unit |
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Application publication date: 20180413 |