CN108916907A - A kind of air preheating system and its Method of blockage removal - Google Patents
A kind of air preheating system and its Method of blockage removal Download PDFInfo
- Publication number
- CN108916907A CN108916907A CN201811013027.9A CN201811013027A CN108916907A CN 108916907 A CN108916907 A CN 108916907A CN 201811013027 A CN201811013027 A CN 201811013027A CN 108916907 A CN108916907 A CN 108916907A
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- CN
- China
- Prior art keywords
- air
- air preheater
- smoke evacuation
- temperature
- preheater
- 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
- F23L15/02—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
- F23J7/00—Arrangement of devices for supplying chemicals to fire
-
- 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)
- Chimneys And Flues (AREA)
- Air Supply (AREA)
Abstract
The present invention relates to a kind of air preheating system and its Method of blockage removal, air preheating system includes more air preheaters arranged side by side, air preheater inlet is connected with gas baffle and pressure fan in turn, every air preheater entrance is set to blow each independently, air preheater outlet is connected to boiler each independently, every air preheater exit is provided with secondary air damper, and every air preheater smoke evacuation exit is respectively connected with air-introduced machine, and all air preheater smoke evacuations outlet parallel communication is together as smoke evacuation general export；Method of blockage removal include gradually close wherein an air preheater secondary air damper, adjust smoke evacuation general export at temperature within the scope of 220 DEG C~235 DEG C, be discharged after so that the tamper in air preheater is sublimed into gaseous state.Block clearing is seriatim carried out to each air preheater, eliminates security risk under the precondition for maintaining existing boiler of power plant stable operation using technical solution of the present invention, block clearing operation is carried out to air preheater again after avoiding shutdown, saves maintenance cost.
Description
Technical field
The invention belongs to technical field of electric power more particularly to a kind of air preheating systems and its Method of blockage removal.
Background technique
Thermal power generation is high pollution industry, and influence of the generated various pollutants to people's living environment is very big, closely
Nian Lai, country has put into effect a series of policies for improvement thermal power generation corporations' pollution problem in succession, in this case, existing
Most thermal power plants be respectively mounted equipment for denitrifying flue gas, the flue gas of discharge is administered.However, as flue gas is de-
Nitre device puts into operation, the part of sulfuric acid hydrogen ammonia escaped from equipment for denitrifying flue gas then can air to original boiler of power plant it is pre-
Hot systems damage, this part of sulfuric acid hydrogen ammonia easily condenses in air preheater, block air preheater, after air preheater blocking, no
It only causes air preheater heat exchange efficiency to decline, reduces boiler thermal efficiency, and cigarette cigarette system fan electric current is caused to rise, station service
Rate rises, and even causes air-introduced machine undercapacity, and unit output is limited, is forced blowing out cleaning when tight；After air preheater blocking, boiler
Furnace pressure in periodically fluctuate by a relatively large margin, air preheater blocking it is serious when will cause draw, give, primary air fan stall, to thermoelectricity
The safe and stable influence on system operation of factory's boiler is very big, and influences Thermal Power Enterprises economic benefit.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of air preheating system and its Method of blockage removal.
The present invention is achieved by the following technical programs.
The present invention provides a kind of air preheating system and its Method of blockage removal, and main includes more air preheaters arranged side by side, described
Air preheater inlet is connected with gas baffle and pressure fan in turn, and every air preheater entrance is made to blow each independently, described
Air preheater outlet is connected to boiler each independently, and every air preheater exit is provided with secondary air damper, every air preheater
Smoke evacuation exit is respectively connected with air-introduced machine, and all air preheater smoke evacuations outlet parallel communication is together as smoke evacuation general export.
The air preheater quantity is 2.
In addition, including the following steps the present invention also provides a kind of Method of blockage removal of air preheating system：
Step 1：The operation of air preheating system steady load is maintained, a wherein air preheater secondary air damper is closed, is made every
Platform air preheater inlet pressure fan continues to stablize air-supply；
Step 2：Temperature at measurement smoke evacuation general export, by closing remaining each air preheater inlet partial fume baffle
Temperature at smoke evacuation general export is adjusted, temperature at smoke evacuation general export is maintained within the scope of 220 DEG C~235 DEG C, utilizes height
Warm flue gas is discharged after so that the tamper in the air preheater for closing secondary air damper described in step 1 is sublimed into gaseous state；
Step 3：Step 1 is repeated to step 2, successively tamper in every air preheater is purged.
Air preheating system load range described in step 1 is 400MW to 600MW.
It further include using stable power supply to each at adjusting smoke evacuation general export described in step 2 during temperature
Air preheater is steadily powered.
Make the duration 4 that temperature maintains within the scope of 220 DEG C~235 DEG C at smoke evacuation general export small described in step 2
When more than.
By closing remaining each air preheater inlet partial fume plate washer to temperature at smoke evacuation general export described in step 2
During degree is adjusted, further include：When temperature increase rate is greater than 2 DEG C at general export of discharging fume, stop all pairs of air
The blocking cleaning work that pre-heating system carries out.
By closing remaining each air preheater inlet partial fume plate washer to temperature at smoke evacuation general export described in step 2
During degree is adjusted, further include：Each air preheater exit air-introduced machine bearing temperature is detected, axes of blower is worked as
When holding temperature greater than 80 DEG C, stop the blocking cleaning work that all pairs of air preheating systems carry out.
The beneficial effects of the present invention are：Using technical solution of the present invention, existing boiler of power plant stable operation is being maintained
Precondition under, by adjust air preheater discharge fume outlet temperature, block clearing is seriatim carried out to each air preheater, is made therein
Tamper hydrogen sulfate ammonia distils at high temperature to be discharged for gaseous state, is maintained the unimpeded of air preheater, is eliminated security risk, makes power plant
Boiler can continually and steadily be run, and avoid the operation after specially shut down to air preheater progress block clearing, fundamentally be administered
Air preheater blockage problem caused by hydrogen sulfate ammonia, saves maintenance cost, reduces required maintenance time, is Thermal Power Enterprises
Operating cost is reduced, economic benefit is improved.
Detailed description of the invention
Fig. 1 is air preheating system connection schematic diagram of the present invention.
In figure：1- air preheater, 2- gas baffle, 3- pressure fan, 4- boiler, 5- secondary air damper, 6- air-introduced machine, 7- noise reduction
Device, 101- smoke evacuation general export.
Specific embodiment
Be described further below technical solution of the present invention, but claimed range be not limited to it is described.
As shown in Figure 1, the present invention provides a kind of air preheating system and its Method of blockage removal, including more air preheaters arranged side by side
1,1 inlet of air preheater is connected with gas baffle 2 and pressure fan 3 in turn, send 1 entrance of every air preheater each independently
Wind, the outlet of air preheater 1 are connected to boiler 4 each independently, and every 1 exit of air preheater is provided with secondary air damper 5, and every
The smoke evacuation of air preheater 1 exit is respectively connected with air-introduced machine 6, and all smoke evacuations of air preheaters 1 outlet parallel communication is used as smoke evacuation always together
Outlet 101.Further, 1 quantity of air preheater is 2.
Adjusting is passed through under the precondition for maintaining existing boiler of power plant stable operation using technical solution of the present invention
Air preheater smoke evacuation outlet temperature, seriatim carries out block clearing to each air preheater, makes tamper hydrogen sulfate ammonia therein in high temperature
Lower distillation is that gaseous state is discharged, and maintains the unimpeded of air preheater, eliminates security risk, boiler of power plant is enable continually and steadily to transport
Row, and the operation after specially shut down to air preheater progress block clearing is avoided, fundamentally administer sky caused by hydrogen sulfate ammonia
Pre- device blockage problem, saves maintenance cost, reduces required maintenance time, reduces operating cost for Thermal Power Enterprises, mentions
High economic benefit.
In addition, the present invention also provides a kind of Method of blockage removal carried out to such as claim 1 to 2 air preheating system, packet
Include following steps：
Step 1：The operation of air preheating system steady load is maintained, wherein 1 secondary air damper 5 of air preheater is closed, makes
Every 1 inlet pressure fan 3 of air preheater continues to stablize air-supply；Further, air preheating system load range is in step 1
400MW to 600MW.
Step 2：Temperature at measurement smoke evacuation general export 101, by closing remaining 1 inlet partial fume of each air preheater
Temperature is adjusted at 2 pairs of smoke evacuation general exports 101 of baffle, and temperature at smoke evacuation general export 101 is made to maintain 220 DEG C~235 DEG C models
In enclosing, so that step 1 is closed the tamper in the air preheater 1 of secondary air damper 5 using high-temperature flue gas and be sublimed into gaseous state heel row
Out；Further, it adjusts at smoke evacuation general export 101 during temperature, further includes using stable power supply to each sky
Pre- device 1 is steadily powered.Keep the duration 4 that temperature maintains within the scope of 220 DEG C~235 DEG C at smoke evacuation general export 101 small
When more than.Temperature at smoke evacuation general export 101 is adjusted by closing remaining 1 inlet partial fume plate washer of each air preheater
During, further include：Each 1 exit air-introduced machine of air preheater, 6 bearing temperature is detected, when 6 bearing temperature of air-introduced machine
When greater than 80 DEG C, stop the blocking cleaning work that all pairs of air preheating systems carry out.Further, pre- by closing remaining each sky
During temperature at smoke evacuation general export 101 is adjusted in 1 inlet partial fume plate washer of device, further include：Go out when smoke evacuation is total
When temperature increase rate is greater than 2 DEG C at mouth 101, stop the blocking cleaning work that all pairs of air preheating systems carry out.
Step 3：Step 1 is repeated to step 2, successively tamper in every air preheater 1 is purged.
Adjusting is passed through under the precondition for maintaining existing boiler of power plant stable operation using technical solution of the present invention
Air preheater smoke evacuation outlet temperature, seriatim carries out block clearing to each air preheater, makes tamper hydrogen sulfate ammonia therein in high temperature
Lower distillation is that gaseous state is discharged, and maintains the unimpeded of air preheater, eliminates security risk, boiler of power plant is enable continually and steadily to transport
Row, and the operation after specially shut down to air preheater progress block clearing is avoided, fundamentally administer sky caused by hydrogen sulfate ammonia
Pre- device blockage problem, saves maintenance cost, reduces required maintenance time, reduces operating cost for Thermal Power Enterprises, mentions
High economic benefit.
Claims (8)
1. a kind of air preheating system, it is characterised in that：Including more air preheaters (1) arranged side by side, air preheater (1) inlet
It is connected with gas baffle (2) and pressure fan (3) in turn, every air preheater (1) entrance is made to blow each independently, it is described empty pre-
Device (1) outlet is connected to boiler (4) each independently, and every air preheater (1) exit is provided with secondary air damper (5), often
Platform air preheater (1) smoke evacuation exit is respectively connected with air-introduced machine (6), and all air preheater (1) smoke evacuations outlet parallel communication is made together
To discharge fume general export (101).
2. air preheating system as described in claim 1, it is characterised in that：Air preheater (1) quantity is 2.
3. a kind of Method of blockage removal carried out to the air preheating system as described in claim 1 to 2, it is characterised in that：Including following
Step：
Step 1：The operation of air preheating system steady load is maintained, wherein air preheater (1) secondary air damper (5) is closed, makes
Every air preheater (1) inlet pressure fan (3) continues to stablize air-supply；
Step 2：Temperature at measurement smoke evacuation general export (101), by closing remaining each air preheater (1) inlet partial fume
Baffle (2) to smoke evacuation general export (101) at temperature be adjusted, make discharge fume general export (101) at temperature maintain 220 DEG C~
Within the scope of 235 DEG C, make to close the tamper in the air preheater (1) of secondary air damper (5) described in step 1 using high-temperature flue gas
It is discharged after being sublimed into gaseous state；
Step 3：Step 1 is repeated to step 2, successively every air preheater (1) interior tamper is purged.
4. the Method of blockage removal of air preheating system as claimed in claim 3, it is characterised in that：Air preheat described in step 1
System loading range is 400MW to 600MW.
5. the Method of blockage removal of air preheating system as claimed in claim 3, it is characterised in that：Adjusting smoke evacuation described in step 2 is total
It exports at (101) during temperature, further includes steadily being powered using stable power supply to each air preheater (1).
6. the Method of blockage removal of air preheating system as claimed in claim 3, it is characterised in that：Make smoke evacuation total described in step 2
Outlet (101) at temperature maintain the duration within the scope of 220 DEG C~235 DEG C be 4 hours or more.
7. the Method of blockage removal of air preheating system as claimed in claim 3, it is characterised in that：Pass through closing described in step 2
During temperature at smoke evacuation general export (101) is adjusted in remaining each air preheater (1) inlet partial fume plate washer, also
Including：When temperature increase rate is greater than 2 DEG C at smoke evacuation general export (101), stop the clear of all pairs of air preheating systems progress
Stifled work.
8. the Method of blockage removal of air preheating system as claimed in claim 3, it is characterised in that：Pass through closing described in step 2
During temperature at smoke evacuation general export (101) is adjusted in remaining each air preheater (1) inlet partial fume plate washer, also
Including：Each air preheater (1) exit air-introduced machine (6) bearing temperature is detected, when air-introduced machine (6) bearing temperature is greater than 80
DEG C when, stop all pairs of air preheating systems carry out blocking cleaning work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811013027.9A CN108916907A (en) | 2018-08-31 | 2018-08-31 | A kind of air preheating system and its Method of blockage removal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811013027.9A CN108916907A (en) | 2018-08-31 | 2018-08-31 | A kind of air preheating system and its Method of blockage removal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108916907A true CN108916907A (en) | 2018-11-30 |
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ID=64407338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811013027.9A Pending CN108916907A (en) | 2018-08-31 | 2018-08-31 | A kind of air preheating system and its Method of blockage removal |
Country Status (1)
| Country | Link |
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| CN (1) | CN108916907A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964928A (en) * | 2020-06-24 | 2020-11-20 | 华电电力科学研究院有限公司 | Unilateral exhaust smoke temperature rise test method for treating blockage of air preheater |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104180378A (en) * | 2014-07-24 | 2014-12-03 | 国家电网公司 | Method for online elimination of ammonium bisulfate clogging of air pre-heaters of coal-fired boiler of thermal power plant |
| CN205746922U (en) * | 2016-05-20 | 2016-11-30 | 苏州上春仪监测程控设备制造有限公司 | A kind of boiler soot-blowing control system |
-
2018
- 2018-08-31 CN CN201811013027.9A patent/CN108916907A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104180378A (en) * | 2014-07-24 | 2014-12-03 | 国家电网公司 | Method for online elimination of ammonium bisulfate clogging of air pre-heaters of coal-fired boiler of thermal power plant |
| CN205746922U (en) * | 2016-05-20 | 2016-11-30 | 苏州上春仪监测程控设备制造有限公司 | A kind of boiler soot-blowing control system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111964928A (en) * | 2020-06-24 | 2020-11-20 | 华电电力科学研究院有限公司 | Unilateral exhaust smoke temperature rise test method for treating blockage of air preheater |
| CN111964928B (en) * | 2020-06-24 | 2022-02-18 | 华电电力科学研究院有限公司 | Unilateral exhaust smoke temperature rise test method for treating blockage of air preheater |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181130 |
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| RJ01 | Rejection of invention patent application after publication |