CN217715032U - Coal fired power plant tubular air preheater - Google Patents

Coal fired power plant tubular air preheater Download PDF

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Publication number
CN217715032U
CN217715032U CN202221148114.7U CN202221148114U CN217715032U CN 217715032 U CN217715032 U CN 217715032U CN 202221148114 U CN202221148114 U CN 202221148114U CN 217715032 U CN217715032 U CN 217715032U
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China
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temperature
smoke
pipe
tube
flue
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CN202221148114.7U
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盛金贵
索新良
盖志杰
谭袖
王文生
李彦龙
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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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 coal fired power plant tubular air heater, including the pre-heater casing, the high temperature tobacco pipe, the medium temperature tobacco pipe, low temperature tobacco pipe and bypass flue, the top of pre-heater casing is provided with the air inlet, the bottom is provided with the gas outlet, one side of pre-heater casing is inlayed and is had into the mouth, the one end at advancing the mouth is fixed to the high temperature tobacco pipe, the one end at the high temperature tobacco pipe is fixed to the medium temperature tobacco pipe, the opposite side of pre-heater casing is inlayed and is had the outlet flue, the one end at the outlet flue is fixed to the low temperature tobacco pipe, be provided with between low temperature tobacco pipe and the medium temperature tobacco pipe and separate the tobacco pipe, the branch pipe of discharging fume is all installed to the both sides of advancing the mouth, it all installs into the cigarette branch pipe to separate the both sides of tobacco pipe, bypass flue is installed and is discharged fume between the branch pipe and advances the cigarette branch pipe. The utility model discloses can not only effectively improve tubular air heater low temperature section pipe wall temperature, can in time clear away low temperature section deposition, reduce tubular air heater's hourglass wind, flue gas resistance, can effectually delay the ageing of pipeline moreover, prolong life.

Description

Coal fired power plant tubular air preheater
Technical Field
The utility model relates to an air heater technical field specifically is a coal fired power plant tubular air heater.
Background
As the fuel coal of the coal-fired power plant contains sulfur and moisture, S0 is generated in the combustion process of the fuel2，S02And is combined with the excess oxygen in the flue gas to generate S0 under certain conditions3，S03Combines with the water vapor in the flue gas to form sulfuric acid vapor. The sulfuric acid solution is condensed on a part of low-temperature heated surface of the tube wall of the air preheater, the temperature of which is lower than the acid dew point of the flue gas, so that low-temperature corrosion of the heated surface is caused, and meanwhile, the sulfuric acid solution and the deposited ash on the heated surface are subjected to chemical reaction to cause ash deposition hardening, thereby not only influencing the heat transfer of the heated surface, but also increasing the possibility of the deposited ash and ash blockage of the heated surface. At present, the means for preventing the corrosion of the low-temperature section air preheater in the design of the power station boiler produced in China is basically a method for improving the temperature of the tube wall of a heating surface, so that the low-temperature corrosion of the heating surface can be reduced to a certain extent. The methods for increasing the temperature of the tube wall of the heating surface mainly comprise two methods: firstly, hot air recirculation is used, and secondly, a fan heater is additionally arranged in front of the low-temperature section air preheater. The hot air recirculation is the simplest method for improving the temperature of the metal wall of the heating surface, but the method can only improve the temperature of an air inlet to 50-60 ℃, otherwise, the exhaust gas temperature is too high, and the power consumption of a fan is increased, so that the boiler efficiency is greatly reduced. In fact, the use of hot air recirculation is traded for safety of the heated surfaces at the expense of the economics of boiler operation. The low-pressure steam from a steam turbine is utilized to heat cold air, the temperature of the air can be increased to about 80 ℃, although the temperature of the exhaust gas is increased, the total economical efficiency is better than the recycling of hot air, but in the practical application process, the air heater is often leaked and cannot work normally, and in addition, the low-pressure steam from the steam turbine is utilized to heat the cold airThe production and maintenance workload is large.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a coal fired power plant tubular air heater that structural design is reasonable to the low temperature section pipe wall temperature who solves air heater is lower, the easy problem of deposition of low temperature section.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a coal fired power plant tubular air preheater which characterized in that, includes preheater housing, high temperature tobacco pipe, medium temperature tobacco pipe, low temperature tobacco pipe and bypass flue, the top of preheater housing is provided with the air inlet, the bottom of preheater housing is provided with the gas outlet, it has into the mouth to inlay on the outer wall of preheater housing one side, the one end of advancing the mouth extends to the inside of preheater housing, the one end at advancing the mouth is fixed to the high temperature tobacco pipe, the high temperature tobacco pipe is provided with the multiunit, the one end at high temperature tobacco pipe is fixed to the medium temperature tobacco pipe, it has the outlet flue to inlay on the outer wall of preheater housing opposite side, the one end of outlet flue extends to the inside of preheater housing, the one end at the outlet is fixed to the low temperature tobacco pipe, the low temperature tobacco pipe is provided with the multiunit, be provided with between low temperature tobacco pipe and the medium temperature tobacco pipe and separate the tobacco pipe, just the low temperature tobacco pipe is through separating tobacco pipe and medium temperature tobacco pipe intercommunication, all install the branch pipe on the outer wall of advancing the mouth both sides, branch pipe and bypass flue and the branch pipe intercommunication.
Furthermore, the inner walls of the high-temperature smoke pipe, the medium-temperature smoke pipe, the separating smoke pipe and the low-temperature smoke pipe are uniformly coated with corrosion-resistant coatings, so that the corrosion resistance of the inner wall of the pipeline is enhanced.
Furthermore, the top welding of separating the tobacco pipe has the protection casing, the soot blower is installed to the equidistant inside of protection casing, and the inside of being convenient for toward separating the tobacco pipe blows grey, can in time clear away low temperature section deposition, and then has reduced tubular air heater's air leakage, flue gas resistance.
Furthermore, butterfly valves are installed on two sides of the bypass flue, so that the flow of high-temperature flue gas can be conveniently adjusted.
Furthermore, the top of the separating smoke tube at the position of the protective cover is provided with ash blowing openings at equal intervals, and the ash blowing openings are communicated with an ash blower and used for introducing air during ash blowing.
Furthermore, the surface of the corrosion-resistant coating is uniformly coated with the wear-resistant coating, so that the inner wall of the pipeline is not easy to wear.
Furthermore, the surface of the wear-resistant coating is uniformly sprayed with antirust paint, so that the pipeline can be prevented from being rusted.
Compared with the prior art, the utility model, have following advantage and effect: this coal fired power plant's tubular air heater can not only effectively improve tubular air heater low temperature section pipe wall temperature, can in time clear away low temperature section deposition, has reduced tubular air heater's hourglass wind, flue gas resistance, can effectually delay the ageing of pipeline moreover, has prolonged life.
Drawings
Fig. 1 is a schematic front view of a cross-sectional structure of the present invention;
fig. 2 is a schematic view of a partial top view structure of the present invention;
FIG. 3 is a schematic side view of the high temperature flue tube of the present invention;
FIG. 4 is a side view, sectional and schematic view of the smoke separation tube of the present invention;
fig. 5 is a schematic view of a partial sectional structure of the high temperature flue tube of the present invention.
In the figure: the device comprises a preheater shell 1, an air outlet 2, a smoke inlet 3, a high-temperature smoke pipe 4, a medium-temperature smoke pipe 5, an air inlet 6, a partition smoke pipe 7, a low-temperature smoke pipe 8, a smoke outlet 9, a smoke exhaust branch pipe 10, a bypass flue 11, a butterfly valve 12, a smoke inlet branch pipe 13, a protective cover 14, a soot blower 15, a soot blowing port 16, a corrosion-resistant coating 17, a wear-resistant coating 18 and antirust paint 19.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1 to 5, in this embodiment, a tubular air preheater for a coal-fired power plant includes a preheater housing 1, a high-temperature smoke tube 4, a medium-temperature smoke tube 5, a low-temperature smoke tube 8 and a bypass flue 11, an air inlet 6 is disposed at a top end of the preheater housing 1, an air outlet 2 is disposed at a bottom end of the preheater housing 1, a smoke inlet 3 is inlaid on an outer wall of one side of the preheater housing 1, one end of the smoke inlet 3 extends into the preheater housing 1, the high-temperature smoke tube 4 is fixed at one end of the smoke inlet 3, the high-temperature smoke tube 4 is provided with a plurality of sets, the medium-temperature smoke tube 5 is fixed at one end of the high-temperature smoke tube 4, a smoke outlet 9 is inlaid on an outer wall of the other side of the preheater housing 1, one end of the smoke outlet 9 extends into the preheater housing 1, the low-temperature smoke tube 8 is fixed at one end of the smoke outlet 9, the low-temperature smoke tube 8 is provided with a plurality of sets, a separation smoke tube 7 is disposed between the low-temperature smoke tube 8 and the medium-temperature smoke tube 5, the low-temperature smoke tube 8 is communicated with the medium-temperature smoke tube 5, the low-temperature smoke tube 7 is communicated with the medium-temperature smoke tube 7, the smoke inlet 13 is communicated with the smoke tube 13, the smoke inlet 13, the smoke tube 13 is respectively communicated with the smoke inlet 13, and the smoke tube 13, and the bypass flue, the smoke inlet 13.
In the embodiment, the inner walls of the high-temperature smoke tube 4, the medium-temperature smoke tube 5, the separating smoke tube 7 and the low-temperature smoke tube 8 are uniformly coated with the corrosion-resistant coating 17, so that the corrosion resistance of the inner wall of the pipeline is enhanced. The surface of the corrosion-resistant coating 17 is uniformly coated with the wear-resistant coating 18, so that the inner wall of the pipeline is not easily worn. The surface of the wear-resistant coating 18 is uniformly sprayed with the antirust paint 19, so that the pipeline can be prevented from being rusted.
In this embodiment, the top end of the separation smoke tube 7 is welded with the protective cover 14, and soot blowers 15 are installed inside the protective cover 14 at equal intervals, so that soot is blown into the separation smoke tube 7 conveniently, and soot deposition at a low temperature section can be removed in time, thereby reducing air leakage and smoke resistance of the tubular air preheater. The top of the separating smoke tube 7 at the position of the protective cover 14 is provided with ash blowing openings 16 at equal intervals, and the ash blowing openings 16 are communicated with a soot blower 15 and used for introducing air during soot blowing.
In this embodiment, butterfly valves 12 are installed on both sides of the bypass flue 11, so as to facilitate the adjustment of the flow of the high-temperature flue gas.
When in use, firstly, the air preheater separately arranges the high-temperature smoke tube 4, the medium-temperature smoke tube 5 and the low-temperature smoke tube 8, the separating smoke tube 7 is arranged between the medium-temperature smoke tube 5 and the low-temperature smoke tube 8, the bypass flue 11 is arranged between the smoke inlet 3 and the separating smoke tube 7, when smoke enters from the smoke inlet 3, part of the smoke enters the bypass flue 11 through the smoke exhaust branch pipe 10, the smoke circulates in the bypass flue 11 and enters the separating smoke tube 7 through the smoke inlet branch pipe 13, and then enters the low-temperature smoke tube 8, the tube wall temperature of the low-temperature smoke tube 8 is improved, the butterfly valve 12 is convenient for adjusting the flow of the high-temperature smoke, the structural design is reasonable, the conception is unique, the tube wall temperature of the low-temperature section of the tubular air preheater can be effectively improved, air enters the preheater shell 1 through the air inlet 6, and heats up after exchanging heat with the high-temperature smoke tube 4, the medium-temperature smoke tube 5 and the low-temperature smoke tube 8, the high-temperature smoke tube 4, the medium-temperature smoke tube 5, the separating smoke tube 7 and the low-temperature smoke tube 8 are uniformly coated with a corrosion-resistant coating 17, the corrosion-resistant coating 17 can be fluorocarbon coating, the fluorocarbon coating has good weather resistance, heat resistance, chemical resistance and unique non-adhesiveness and low friction, the corrosion resistance of the inner wall of the pipeline is enhanced, the wear-resistant coating 18 on the surface of the corrosion-resistant coating 17 can be a zirconium oxide coating, the zirconia coating has high hardness, effectively prevents the scratch of hard objects, ensures that the pipeline is not easily abraded after smoke passes through for a long time, and the antirust paint 19 sprayed on the surface of the wear-resistant coating 18 can prevent the pipeline from being rusted, thereby effectively delaying the aging of the pipeline and prolonging the service life.
Those not described in detail in this specification are well within the skill of the art.
In addition, it should be noted that the above contents described in the present specification are only illustrations of the structure of the present invention. All equivalent changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions by those skilled in the art may be made to the described embodiments without departing from the scope of the invention as defined in the accompanying claims.

Claims (7)

1. The tubular air preheater of the coal-fired power plant is characterized by comprising a preheater shell (1), a high-temperature smoke tube (4), a medium-temperature smoke tube (5), a low-temperature smoke tube (8) and a bypass flue (11), wherein an air inlet (6) is formed in the top end of the preheater shell (1), an air outlet (2) is formed in the bottom end of the preheater shell (1), a smoke inlet (3) is embedded in the outer wall of one side of the preheater shell (1), one end of the smoke inlet (3) extends into the preheater shell (1), the high-temperature smoke tube (4) is fixed at one end of the smoke inlet (3), a plurality of groups of smoke tubes (4) are arranged on the outer wall of the other side of the preheater shell (1), a smoke outlet (9) is embedded in the outer wall of the other side of the preheater shell (1), one end of the smoke outlet (9) extends into the preheater shell (1), the low-temperature smoke tube (8) is fixed at one end of the smoke outlet (9), a plurality of groups of low-temperature smoke tubes (8) are arranged on the outer wall of the low-temperature smoke tube (8), the low-temperature smoke tube (8) is communicated with the medium-temperature smoke tube (5), and the medium-temperature smoke tube (7) is separated from the outer wall of the smoke tube (5), branch pipe of discharging fume (10) and advance mouth of cigarette (3) intercommunication, it all installs on the outer wall of partition tobacco pipe (7) both sides and advances cigarette branch pipe (13), advance cigarette branch pipe (13) and separate tobacco pipe (7) intercommunication, bypass flue (11) are installed and are discharged fume branch pipe (10) and advance between cigarette branch pipe (13), just the both ends of bypass flue (11) communicate with branch pipe of discharging fume (10) and branch pipe of advancing cigarette (13) respectively.
2. The tubular air preheater of claim 1, wherein the inner walls of the high-temperature flue tube (4), the medium-temperature flue tube (5), the partition flue tube (7) and the low-temperature flue tube (8) are coated with a corrosion-resistant coating (17) uniformly.
3. The tubular air preheater of claim 1, wherein a protective cover (14) is welded to the top end of the partition flue pipe (7), and soot blowers (15) are installed inside the protective cover (14) at equal intervals.
4. A coal fired power plant tubular air preheater according to claim 1, characterized in that butterfly valves (12) are installed on both sides of the bypass flue (11).
5. The tubular air preheater of the coal-fired power plant as recited in claim 3, characterized in that the top of the partition flue pipe (7) at the location of the protective cover (14) is provided with ash blowing ports (16) at equal intervals, and the ash blowing ports (16) are communicated with ash blowers (15).
6. The coal fired power plant tubular air preheater according to claim 2, wherein the surface of the corrosion resistant coating (17) is uniformly coated with a wear resistant coating (18).
7. The coal fired power plant tubular air preheater according to claim 6, wherein the surface of the wear resistant coating (18) is uniformly sprayed with a rust inhibitive paint (19).
CN202221148114.7U 2022-05-13 2022-05-13 Coal fired power plant tubular air preheater Active CN217715032U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221148114.7U CN217715032U (en) 2022-05-13 2022-05-13 Coal fired power plant tubular air preheater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221148114.7U CN217715032U (en) 2022-05-13 2022-05-13 Coal fired power plant tubular air preheater

Publications (1)

Publication Number Publication Date
CN217715032U true CN217715032U (en) 2022-11-01

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ID=83793150

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Application Number Title Priority Date Filing Date
CN202221148114.7U Active CN217715032U (en) 2022-05-13 2022-05-13 Coal fired power plant tubular air preheater

Country Status (1)

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CN (1) CN217715032U (en)

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