CN114543113A - System for controlling low-temperature corrosion of heated surface at tail of boiler - Google Patents
System for controlling low-temperature corrosion of heated surface at tail of boiler Download PDFInfo
- Publication number
- CN114543113A CN114543113A CN202210192725.XA CN202210192725A CN114543113A CN 114543113 A CN114543113 A CN 114543113A CN 202210192725 A CN202210192725 A CN 202210192725A CN 114543113 A CN114543113 A CN 114543113A
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- Prior art keywords
- air
- cold air
- pipeline
- cold
- boiler
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- 230000007797 corrosion Effects 0.000 title claims abstract description 28
- 238000005260 corrosion Methods 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003546 flue gas Substances 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Images
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
-
- 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
-
- 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
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 discloses a system for controlling low-temperature corrosion of a heating surface at the tail part of a boiler, which comprises a cold air pipeline, an air preheater, a flue, a hot air pipeline, a cold air bypass pipeline, a cold air door adjusting baffle, a temperature measuring element and the like; the cold air flowing through the fan is partially sent to the air preheater through the cold air bypass pipeline before being sent to the air preheater and is not heated by the air preheater. The flow of the cold air flowing through the cold air bypass pipeline is controlled by the cold air door adjusting baffle. Because the flow of the cold air flowing through the air preheater is reduced, and the flow of the flue gas flowing through the air preheater is unchanged, the temperature rise of the cold air side is increased, the temperature of the metal wall surface of the air preheater is correspondingly increased, and the low-temperature corrosion control device has a good effect on controlling the low-temperature corrosion of the air preheater. At the air duct outlet of the air preheater, cold air flowing through the cold air bypass and not heated converges into the hot air duct, and is mixed with hot air flowing through the air preheater and heated, and then is sent into the hearth. The invention can be widely applied to power station boilers and industrial boilers.
Description
Technical Field
The invention belongs to the technical field of power station boilers and industrial boilers, and particularly relates to a system for controlling low-temperature corrosion of a heating surface at the tail part of a boiler.
Background
During the operation of the coal-fired boiler, sulfur in the fuel is combusted to generate sulfuric acid steam, so that the dew point of the flue gas is obviously increased. In the low-temperature flue gas section, when the temperature of the heated surface wall is lower than the dew point of the flue gas, sulfuric acid vapor can be condensed on the metal wall surface to cause sulfuric acid corrosion, namely low-temperature corrosion. The low-temperature corrosion mainly occurs on the heating surface of the air preheater, after the low-temperature corrosion occurs, the air leakage occurs on the heating surface due to corrosion perforation, a large amount of air leaks into the flue gas, so that the smoke discharge loss is increased, the fan load is increased, the power consumption is increased, meanwhile, due to insufficient air supply, the combustion in the boiler is deteriorated, the boiler efficiency is reduced, incomplete combustion in the boiler can be caused in severe cases, the boiler output is reduced, and the economical efficiency and the safety of the boiler operation are influenced. In addition, the current new energy power generation is greatly developed, the coal-fired unit generally undertakes the peak shaving task, the unit is under low load for a long time, the flue gas temperature is low, and the possibility of low-temperature corrosion is increased.
At present, the commonly used measures for controlling the low-temperature corrosion of the air preheater mainly adopt a hot air recirculation system, additionally install a fan heater and the like. A typical hot air recirculation system is shown in fig. 1, wherein a part of hot air is led out from an air outlet of an air preheater, passes through a hot air circulation pipeline 6 (a hot air door adjusting baffle 7 is arranged on the hot air circulation pipeline) to reach an inlet of a fan 2, and is mixed with cold air, so that the mixed air temperature reaches the air inlet temperature requirement of the air preheater and then enters the air preheater through the fan 2. As shown in fig. 2, the steam turbine extracts steam at low pressure to the air heater to heat the air flowing through the air heater 8, so as to raise the temperature of the air entering the air preheater, and further raise the wall temperature of the heated surface of the air preheater.
The two measures can achieve the purpose of controlling the low-temperature corrosion of the air preheater by controlling the inlet air temperature of the air preheater. However, the hot air recycling system increases the air quantity at the inlet of the fan, so that the power consumption is increased; meanwhile, the system resistance is increased by increasing the air quantity of the fan and the air preheater, so that the power consumption is increased; in addition, a small amount of flue gas can leak into the air side in air heater for the hot-blast of air heater of flowing through carries partly smoke and dust, adds the heated air recirculation back at the fan entrance, and the fan is operated under the dusty operating mode, and operating condition worsens, and the operating life of fan reduces. The additional installation of the air heater system has large investment, the air heater increases the resistance in an air duct, the power consumption of a fan is increased, and meanwhile, the problems of leakage, ash blockage and the like exist in the operation of the air heater system.
Disclosure of Invention
The invention aims to provide a system for controlling low-temperature corrosion of a heating surface at the tail part of a boiler, which is used for improving the temperature of a cold end of an air preheater of the boiler and controlling the low-temperature corrosion of the air preheater. The invention can be widely applied to power station boilers and industrial boilers.
The invention is realized by adopting the following technical scheme:
the utility model provides a system for control boiler afterbody heating surface low temperature corrosion, includes air heater for with the flue of air heater heat transfer, connect the cold air duct in air heater air entrance department, connect the hot-blast main in air heater air exit department, the cold wind bypass pipeline of intercommunication cold air duct and hot-blast main, set up the cold air door adjusting stop on cold wind bypass pipeline to and set up the temperature element in air heater export flue.
The invention has the further improvement that the cold air pipeline is provided with a fan.
The invention has the further improvement that a cold air pipeline of the air preheater is connected with a hot air pipeline, and air in the cold air pipeline is shunted through a cold air bypass pipeline.
The invention is further improved in that a cold air door adjusting baffle arranged on the cold air bypass pipeline is used for adjusting the air flow passing through the cold air bypass pipeline.
The invention is further improved in that a stop gate is arranged on the cold air bypass pipeline and used for closing the cold air bypass pipeline when the cold air bypass is not needed.
The invention is further improved in that a plurality of temperature measuring elements are arranged in the outlet flue of the air preheater.
The invention is further improved in that the air flow passing through the cold air bypass pipeline is controlled in real time by measuring the temperature of the flue gas at the outlet of the air preheater through the temperature measuring element.
The invention is further improved in that the temperature measuring element is a thermocouple, a thermal resistor or a thermistor.
The invention has at least the following beneficial technical effects:
according to the invention, only a cold air bypass pipeline and an adjusting baffle plate from the cold air pipeline of the air preheater to the hot air pipeline of the air preheater are needed to be added, and part of cold air in the cold air pipeline can directly flow into the hot air pipeline behind the air preheater through the cold air bypass pipeline and the cold air door adjusting baffle plate without flowing through the air preheater, so that excessive capital investment is not needed, and the existing equipment is not required to be greatly modified. The size of the air flow flowing through the cold air bypass pipeline is adjusted in real time through the measurement of the temperature of the flue gas at the outlet of the air preheater by the temperature measuring element and the cold air door adjusting baffle arranged on the cold air bypass pipeline. Compared with a hot air recirculation system, the air quantity passing through the fan and the air preheater is reduced, the system resistance is low, and the power consumption is reduced; meanwhile, the condition that the fan operates under the dust-containing working condition does not exist, and the service life of the fan is not influenced. Compared with the additionally arranged air heater system, the invention has the advantages of less investment, small system resistance, low power consumption and no problems of leakage, ash blockage and the like in the air heater system.
Therefore, the invention has the characteristics of less investment, simple modification, small resistance and small influence on the normal operation of the system, and has good economical efficiency and operability.
Drawings
FIG. 1 is a schematic view of a boiler hot air recirculation system;
FIG. 2 is a schematic diagram of a boiler air heater system;
FIG. 3 is a schematic diagram of a boiler cold air bypass system.
In the figure: the device comprises a cold air pipeline, a fan, an air preheater, a flue, a hot air pipeline, a hot air circulation pipeline, a hot air door adjusting baffle, a warm air device, a cold air bypass pipeline, a cold air door adjusting baffle, a cold air door, a stop door and a temperature measuring element, wherein the cold air pipeline comprises 1 part of the cold air pipeline, 2 part of the fan, 3 part of the air preheater, 4 part of the flue, 5 part of the hot air pipeline, 6 part of the hot air circulation pipeline, 7 part of the hot air door adjusting baffle, 8 part of the warm air device, 9 part of the cold air bypass pipeline, 10 part of the cold air door adjusting baffle, 11 part of the stop door and 12 part of the temperature measuring element.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Examples
As shown in FIG. 3, the system for controlling low-temperature corrosion of the heated surface at the tail of the boiler provided by the invention comprises a cold air pipeline 1, a fan 2, an air preheater 3, a flue 4, a hot air pipeline 5, a cold air bypass pipeline 9, a cold air door adjusting baffle 10, a stop door 11 and a temperature measuring element 12.
Wherein, before the cold air flowing through the fan 2 is sent into the air preheater 3, a part of the cold air is sent to the air preheater 3 through the cold air bypass pipeline 9 and is not heated by the air preheater 3. The flow of the cold air flowing through the cold air bypass pipeline 9 is controlled by a cold air door adjusting baffle 10. Because the flow of the cold air flowing through the air preheater 3 is reduced, and the flow of the flue gas flowing through the air preheater 3 is unchanged, the temperature rise of the cold air side is increased, the temperature of the metal wall surface of the air preheater is correspondingly increased, and the low-temperature corrosion control device has a good effect on controlling the low-temperature corrosion of the air preheater. At the air channel outlet of the air preheater, cold air flowing through the cold air bypass 9 and not heated flows into the hot air pipeline 5, is mixed with hot air flowing through the air preheater 3 and heated, and then is sent into the hearth. The cold air bypass duct can be closed by the shut-off door 11 when the cold air bypass is not required.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a system for control boiler afterbody heating surface low temperature corrosion, a serial communication port, including air heater (3), be used for with flue (4) of air heater (3) heat transfer, connect cold wind pipeline (1) at air heater (3) air inlet department, connect hot-blast main (5) at air heater (3) air outlet department, cold wind bypass pipeline (9) of intercommunication cold wind pipeline (1) and hot-blast main (5), set up cold air door adjusting stop (10) on cold wind bypass pipeline (9), and set up in temperature element (12) of air heater (3) outlet flue.
2. The system for controlling the low-temperature corrosion of the heated surface at the tail part of the boiler as claimed in claim 1, wherein the fan (2) is arranged on the cold air duct (1).
3. The system for controlling the low-temperature corrosion of the heating surface at the tail part of the boiler as claimed in claim 1, wherein the cold air pipeline (1) of the air preheater is connected with the hot air pipeline (5), and air in the cold air pipeline (1) is shunted through the cold air bypass pipeline (9).
4. The system for controlling the low-temperature corrosion of the heated surface at the tail part of the boiler as claimed in claim 1, characterized in that a cold air door adjusting baffle (10) arranged on the cold air bypass pipeline (9) is used for adjusting the air flow passing through the cold air bypass pipeline (9).
5. The system for controlling the low-temperature corrosion of the heated surface at the tail part of the boiler as claimed in claim 1, characterized in that a stop gate (11) is arranged on the cold air bypass pipeline (9) for closing the cold air bypass pipeline (9) when the cold air bypass is not needed.
6. The system for controlling the low-temperature corrosion of the heating surface at the tail part of the boiler is characterized in that a plurality of temperature measuring elements (12) are arranged in the outlet flue of the air preheater (3).
7. The system for controlling the low-temperature corrosion of the heating surface at the tail part of the boiler as claimed in claim 1, characterized in that the air flow passing through the cold air bypass pipeline (9) is controlled in real time by measuring the temperature of flue gas at the outlet of the air preheater through a temperature measuring element (12).
8. The system for controlling the low-temperature corrosion of the heating surface at the tail part of the boiler as recited in claim 1, characterized in that the temperature measuring element (12) is a thermocouple, a thermal resistor or a thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210192725.XA CN114543113A (en) | 2022-02-28 | 2022-02-28 | System for controlling low-temperature corrosion of heated surface at tail of boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210192725.XA CN114543113A (en) | 2022-02-28 | 2022-02-28 | System for controlling low-temperature corrosion of heated surface at tail of boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114543113A true CN114543113A (en) | 2022-05-27 |
Family
ID=81660863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210192725.XA Pending CN114543113A (en) | 2022-02-28 | 2022-02-28 | System for controlling low-temperature corrosion of heated surface at tail of boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114543113A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000130988A (en) * | 1998-10-23 | 2000-05-12 | Ishikawajima Harima Heavy Ind Co Ltd | Temperature controller for regenerative air preheater |
| JP2000257855A (en) * | 1999-03-09 | 2000-09-22 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for controlling bypass damper for air preheater |
| JP2001082735A (en) * | 1999-09-09 | 2001-03-30 | Babcock Hitachi Kk | Air preheater |
| CN201387022Y (en) * | 2009-03-04 | 2010-01-20 | 大连熵立得传热技术有限公司 | Cold blast intermediate bypass low-temperature-corrosion resistant air pre-heater |
| CN102062409A (en) * | 2010-12-07 | 2011-05-18 | 岳阳长岭设备研究所有限公司 | Anti-fume dew point corrosion online alarm technology for heat pipe air preheater |
-
2022
- 2022-02-28 CN CN202210192725.XA patent/CN114543113A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000130988A (en) * | 1998-10-23 | 2000-05-12 | Ishikawajima Harima Heavy Ind Co Ltd | Temperature controller for regenerative air preheater |
| JP2000257855A (en) * | 1999-03-09 | 2000-09-22 | Ishikawajima Harima Heavy Ind Co Ltd | Method and device for controlling bypass damper for air preheater |
| JP2001082735A (en) * | 1999-09-09 | 2001-03-30 | Babcock Hitachi Kk | Air preheater |
| CN201387022Y (en) * | 2009-03-04 | 2010-01-20 | 大连熵立得传热技术有限公司 | Cold blast intermediate bypass low-temperature-corrosion resistant air pre-heater |
| CN102062409A (en) * | 2010-12-07 | 2011-05-18 | 岳阳长岭设备研究所有限公司 | Anti-fume dew point corrosion online alarm technology for heat pipe air preheater |
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