CN210832075U - Anti-blocking device of tubular air preheater - Google Patents
Anti-blocking device of tubular air preheater Download PDFInfo
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- CN210832075U CN210832075U CN201921088624.8U CN201921088624U CN210832075U CN 210832075 U CN210832075 U CN 210832075U CN 201921088624 U CN201921088624 U CN 201921088624U CN 210832075 U CN210832075 U CN 210832075U
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- 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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Abstract
The utility model discloses a tubular air heater prevents stifled device, including at least two sets of group heat exchange tube group, flue gas channel and pressure measurement system, the one end of flue gas channel is the flue gas entry, and the other end is exhanst gas outlet, each heat exchange tube group violently establishes on flue gas channel, and lies in between flue gas entry and the exhanst gas outlet, the pressure measurement system is used for testing the air pressure difference of heat exchange tube group both sides flue gas channel, the inlet end and the female pipe intercommunication in import wind channel of heat exchange tube group, the end of giving vent to anger and the female pipe intercommunication in wind channel of giving vent to anger of heat exchange tube group, be equipped with the governing valve between heat exchange tube group and the female. When the pressure difference of the flue gas channels on the two sides of the heat exchange tube group measured by the pressure measuring system is increased to a certain value, the ammonia bisulfate plate is serious in dust accumulation, the regulating valve is closed at the moment, the air inlet in the heat exchange tube group is cut off, the heat exchange tube group is heated by the flue gas in the flue gas channels, and then the ammonia bisulfate plate attached to the heat exchange tube group is heated and volatilized.
Description
Technical Field
The utility model relates to an air heater technical field especially relates to a tubular air heater prevents stifled device.
Background
For coal-fired boilers, the exhaust gas temperature is an important index parameter for measuring the economic efficiency of a unit, and has a great influence on the standard coal consumption of the power supply of the unit. Research shows that the power supply standard coal consumption of the unit increases by 2-3g/(kW & h) when the exhaust gas temperature increases by 20 ℃. Therefore, both utility boilers and industrial boilers are equipped with air preheaters, which use the waste heat of flue gas to lower the temperature of exhaust gas and simultaneously raise the temperature of primary and secondary air entering the boiler, and tubular air preheaters are one of the important types.
Along with the long-time operation of the equipment, the problems of equipment aging and low-temperature corrosion occur, so that the problem of corrosion leakage of a heat exchange tube of the air preheater is caused; meanwhile, with the improvement of ultra-low emission, after denitration improvement and upgrading of SNCR and SCR technologies, ammonia bisulfate in different degrees is hardened and deposited on the pipe wall of a heat exchange pipe in the air preheater. And then caused the increase of the resistance of the flue gas-air system, the temperature of the primary air and the secondary air not to reach the standard, the efficiency of the boiler is reduced, and the safe and stable operation of the unit is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a stifled device is prevented to tubular air heater to solve heat exchange tube group and harden the deposition because of adhering to more ammonium bisulfate on the surface, and lead to the problem of jam.
The utility model adopts the technical proposal that: the utility model provides a tubular air preheater prevents stifled device, includes two sets of group heat exchange tube sets at least, flue gas channel and pressure measurement system, the one end of flue gas channel is the flue gas entry, and the other end is the exhanst gas outlet, and each heat exchange tube set violently establishes on flue gas channel, and lies in between flue gas entry and the exhanst gas outlet, the pressure measurement system is used for testing the air pressure difference of heat exchange tube set both sides flue gas channel, the inlet end and the female pipe intercommunication in import wind channel of heat exchange tube set, the end of giving vent to anger of heat exchange tube set and the female pipe intercommunication in the wind channel of giving vent to anger, be equipped with the governing valve.
Further preferably, the pressure measuring system comprises a smoke inlet pressure measuring device and a smoke outlet pressure measuring device, the smoke inlet pressure measuring device is arranged at one end close to the smoke inlet, and the smoke outlet pressure measuring device is arranged at one end close to the smoke outlet.
And each heat exchange tube group comprises a plurality of heat exchange tubes arranged side by side, an inlet air box is arranged at the air inlet end of each heat exchange tube, one end of each inlet air box is communicated with the air inlet end of each heat exchange tube group, and the other end of each inlet air box is communicated with an inlet air channel main pipe through an inlet air channel.
Further optimization, each inlet air channel is provided with a regulating valve.
Further optimize, each the end of giving vent to anger of heat exchange tube is equipped with the bellows of giving vent to anger, the one end of the bellows of giving vent to anger and the end intercommunication of giving vent to anger of each heat exchange tube, the other end is through giving vent to anger the wind channel and give vent to anger the female pipe intercommunication in wind channel.
Further optimizing, the heat exchange tube adopts enamel heat exchange tube.
And further optimizing, wherein the flue gas inlet pressure gauge, the flue gas outlet pressure gauge and the regulating valve are electrically connected with the terminal controller.
The utility model has the advantages that: when more ammonium bisulfate plate deposits are attached to the heat exchange tube group, the pressure difference of the flue gas channels on the two sides of the heat exchange tube group measured by the pressure measuring system is increased, when the measured pressure difference is larger than a certain value, the ammonium bisulfate plate deposits are serious, the regulating valve is closed at the moment, the air inlet in the heat exchange tube group is cut off, the heat exchange tube group is heated by the flue gas in the flue gas channel, and further the ammonium bisulfate plate attached to the heat exchange tube group is heated and volatilized, so that the surface cleanliness of the heat exchange tube group is improved, and the heat transfer effect of the heat exchange tube group is ensured.
Drawings
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is the structure schematic diagram of the tubular air preheater anti-blocking device of the embodiment of the present invention.
Detailed Description
The anti-blocking device of the tubular air preheater shown in fig. 1 comprises at least two groups of heat exchange tube groups 100, a flue gas channel 200 and a pressure measuring system, wherein one end of the flue gas channel 200 is a flue gas inlet 210, the other end of the flue gas channel is a flue gas outlet 220, each heat exchange tube group 100 is transversely arranged on the flue gas channel 200 and is positioned between the flue gas inlet 210 and the flue gas outlet 220, the pressure measuring system is used for testing the air pressure difference of the flue gas channels 200 at two sides of the heat exchange tube groups 100, the air inlet end of the heat exchange tube group 100 is communicated with an inlet air channel main tube 300, the air outlet end of the heat exchange tube group 100 is communicated with an air outlet air channel main tube 400, and an adjusting valve 500 is.
The pressure measuring system comprises a smoke inlet pressure measuring device 610 and a smoke outlet pressure measuring device 620, wherein the smoke inlet pressure measuring device 610 is arranged at one end close to the smoke inlet 210, and the smoke outlet pressure measuring device 620 is arranged at one end close to the smoke outlet 220.
Hotter flue gas enters through the flue gas inlet 210 and exits through the flue gas outlet 220, heating the gas within the heat exchange tube bank 100 as it passes through the heat exchange tube bank 100, thereby reducing the temperature of the flue gas. Meanwhile, when a part of gaseous ammonium bisulfate in the flue gas contacts the tube wall of the heat exchange tube group 100, the cooled part of gaseous ammonium bisulfate can be converted into a solid state to be attached to the tube wall of the heat exchange tube group 100, and the attached ammonium bisulfate layer becomes thicker and thicker along with the lapse of working time, so that the circulation of the flue gas in the flue gas channel 200 can be blocked.
Because the circulation of the flue gas in the flue gas channel 200 is blocked, the pressure difference measured by the flue gas inlet pressure gauge 610 and the flue gas outlet pressure gauge 620 gradually increases, when the measured pressure difference is larger than a certain value, the setting can be performed according to the actual working condition, the ash deposition of the ammonium bisulfate plate is judged to be serious, at this time, the adjusting valve 500 is closed, the air inlet in the heat exchange tube group 100 is cut off, the heat exchange tube group 100 is heated by the flue gas in the flue gas channel 100, and then the ammonium bisulfate plate attached to the heat exchange tube group 100 is heated and volatilized, so that the ammonium bisulfate plate is removed, the surface cleanliness of the heat exchange tube group 100 is improved, and the heat transfer effect of the heat exchange tube group.
Each heat exchange tube set 100 comprises a plurality of heat exchange tubes arranged side by side, an inlet air box 710 is arranged at the air inlet end of each heat exchange tube, one end of the inlet air box 710 is communicated with the air inlet end of each heat exchange tube set, and the other end of the inlet air box 710 is communicated with the inlet air channel main tube 300 through an inlet air channel 720.
The heat exchange tube set 100 is formed by integrating a plurality of heat exchange tubes, so that the heat exchange efficiency can be improved, and the gas of the inlet air channel main tube 300 is distributed into each heat exchange tube assembly through the inlet air channel 720, so that each heat exchange tube can be ensured to be capable of obtaining inlet air.
In the embodiment, taking three sets of heat exchange tube sets 100 as an example, each inlet duct 720 is provided with an adjusting valve 500. In actual operation, any one of the adjusting valves 500 can be respectively closed, so that the air inlet of the heat exchange tube set 100 is closed, ammonium bisulfate attached to the surface of the heat exchange tube set 100 is heated and decomposed, the problem of ash deposition and hardening of the heat exchange tube set 100 is solved, the other heat exchange tube sets 100 work normally, the normal work of the whole air preheater is ensured, and finally the problem of ash deposition and hardening of all the heat exchange tube sets 100 is solved one by one.
An air outlet air box 810 is arranged at the air outlet end of each heat exchange tube, one end of the air outlet air box 810 is communicated with the air outlet end of each heat exchange tube, and the other end of the air outlet air box 810 is communicated with the air outlet air channel main tube 400 through an air outlet air channel 820.
The air flowing out of all the heat exchange tubes is collected by the air outlet air box 810 and then sent to the air outlet air channel main tube 400, so that the air flowing out of all the heat exchange tubes is completely collected.
The heat exchange tube is made of enamel, so that low-temperature corrosion caused by the attachment of ammonium bisulfate in low-temperature flue gas on the tube wall can be reduced, and the temperature field of air at the outlet of the air preheater is uniform.
The flue gas inlet pressure gauge 610, the flue gas outlet pressure gauge 620 and the regulating valve 500 are electrically connected to the terminal controller 900. The gas pressures measured by the flue gas inlet pressure gauge 610 and the flue gas outlet pressure gauge 620 are transmitted to the terminal controller 900, and the terminal controller 900 determines whether to close the regulating valve 500 after receiving corresponding data, thereby realizing an automatic control process.
Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.
Claims (7)
1. The utility model provides a tubular air heater prevents stifled device which characterized in that: the device comprises at least two groups of heat exchange tube sets (100), a smoke channel (200) and a pressure measuring system, wherein one end of the smoke channel (200) is a smoke inlet (210), the other end of the smoke channel is a smoke outlet (220), each heat exchange tube set (100) is transversely arranged on the smoke channel (200) and is positioned between the smoke inlet (210) and the smoke outlet (220), the pressure measuring system is used for testing the air pressure difference of the smoke channel (200) on the two sides of the heat exchange tube set (100), the air inlet end of the heat exchange tube set (100) is communicated with an inlet air channel main pipe (300), the air outlet end of the heat exchange tube set (100) is communicated with an air outlet air channel main pipe (400), and a regulating valve (500) is arranged between the heat exchange tube set (100) and the inlet air channel main pipe (300).
2. A tubular air preheater anti-clogging device according to claim 1, wherein: the pressure measuring system comprises a smoke inlet pressure measuring device (610) and a smoke outlet pressure measuring device (620), wherein the smoke inlet pressure measuring device (610) is arranged at one end close to the smoke inlet (210), and the smoke outlet pressure measuring device (620) is arranged at one end close to the smoke outlet (220).
3. A tubular air preheater anti-clogging device according to claim 1, wherein: each heat exchange tube set (100) comprises a plurality of heat exchange tubes arranged side by side, an inlet air box (710) is arranged at the air inlet end of each heat exchange tube, one end of each inlet air box (710) is communicated with the air inlet end of each heat exchange tube set, and the other end of each inlet air box is communicated with an inlet air channel main pipe (300) through an inlet air channel (720).
4. A tubular air preheater anti-clogging device according to claim 3, wherein: each inlet air duct (720) is provided with a regulating valve (500).
5. A tubular air preheater anti-clogging device according to claim 3 or 4, wherein: the air outlet end of each heat exchange tube is provided with an air outlet air box (810), one end of the air outlet air box (810) is communicated with the air outlet end of each heat exchange tube, and the other end of the air outlet air box is communicated with an air outlet air channel main tube (400) through an air outlet air channel (820).
6. A tubular air preheater anti-clogging device according to claim 3 or 4, wherein: the heat exchange tube is an enamel heat exchange tube.
7. A tubular air preheater anti-clogging device according to claim 2, wherein: the flue gas inlet pressure measuring device (610), the flue gas outlet pressure measuring device (620) and the regulating valve (500) are electrically connected with the terminal controller (900).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921088624.8U CN210832075U (en) | 2019-07-11 | 2019-07-11 | Anti-blocking device of tubular air preheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921088624.8U CN210832075U (en) | 2019-07-11 | 2019-07-11 | Anti-blocking device of tubular air preheater |
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| CN210832075U true CN210832075U (en) | 2020-06-23 |
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| CN201921088624.8U Active CN210832075U (en) | 2019-07-11 | 2019-07-11 | Anti-blocking device of tubular air preheater |
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Cited By (1)
| 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 |
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2019
- 2019-07-11 CN CN201921088624.8U patent/CN210832075U/en active Active
Cited By (1)
| 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 |
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