CN217843924U - Air preheater - Google Patents
Air preheater Download PDFInfo
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- CN217843924U CN217843924U CN202221717047.6U CN202221717047U CN217843924U CN 217843924 U CN217843924 U CN 217843924U CN 202221717047 U CN202221717047 U CN 202221717047U CN 217843924 U CN217843924 U CN 217843924U
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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 an air preheater, include: a housing including a top portion, a bottom portion, and a side portion between the top portion and the bottom portion; the heat exchange tube is arranged in the shell in a generally vertical mode; in use, the upper opening of the heat exchange tube is arranged to receive flue gas and the lower opening is arranged to discharge flue gas, at least the inner wall of the heat exchange tube is corrosion resistant, the heat exchange tube can also be arranged such that the flue gas temperature is below the dew point temperature after heat exchange with air entering from the air inlet and exiting from the air outlet via the heat exchange tube. The utility model discloses can be intraductal with the flue gas restriction, avoid corroding other spare parts of air heater, and because the flue gas from top to bottom erodees, carries, the corrosivity condensate of production is easily discharged from the heat exchange tube, and is favorable to the scale removal to make air heater have self-cleaning function, and improved the security and the life of the spare part that heat exchange efficiency and heat transfer in-process used.
Description
Technical Field
The utility model relates to the field of oil refining, chemical industry etc, more specifically relates to an air heater.
Background
Air preheaters are commonly used to recover heat from hot flue gases discharged from a furnace to preheat the air introduced into the furnace to improve and enhance combustion in the furnace and increase thermal efficiency.
In order to improve the heat exchange efficiency of the air preheater, the lower the hot flue gas discharge temperature after heat recovery is expected to be, the better, but the flue gas can be condensed after being lower than the dew point temperature, the generated condensate has strong corrosivity, and the condensate is easy to gather and adhere to a heat exchange tube, so that the corrosion problem of the air preheater is difficult to solve.
SUMMERY OF THE UTILITY MODEL
The object of the utility model is to solve or at least partially alleviate above-mentioned problem through providing an air heater.
According to the utility model discloses, an air heater is provided, include:
a housing including a top portion, a bottom portion, and a side portion between the top portion and the bottom portion;
the heat exchange tube is arranged in the shell in a generally vertical mode;
the upper tube plate and the lower tube plate are respectively provided with a matching hole for the heat exchange tube to pass through, the edges of the upper tube plate and the lower tube plate are hermetically connected to the shell, and the outer surface of the heat exchange tube passing through the matching hole is hermetically connected with the matching hole; and
an air inlet and an air outlet respectively arranged at two opposite side parts of the shell between the upper tube plate and the lower tube plate,
wherein, in use, the upper opening of the heat exchange tube is arranged to receive flue gas and the lower opening is arranged to exhaust flue gas, at least the inner wall of the heat exchange tube is corrosion resistant, the heat exchange tube is capable of being arranged such that the flue gas temperature is below the dew point temperature after heat exchange with air entering from the air inlet and exiting from the air outlet via the heat exchange tube.
Preferably, a condensate and soot collecting and discharging device is further arranged below the lower opening of the heat exchange tube, and the condensate and soot collecting and discharging device can be detached or is provided with a discharging port.
Preferably, a spraying device is further arranged above the upper opening of the heat exchange tube and used for spraying liquid, so that the liquid enters the heat exchange tube from the upper opening of the heat exchange tube to flush the inside of the heat exchange tube.
Preferably, the heat exchange tube is a flat tube with a cross section having a width greater than a height.
Preferably, the ratio of the width to the height of the cross section is greater than or equal to 5.
Preferably, the heat exchange tube and/or the lower tube plate are made of metal, glass or polymer with corrosion resistance, or the inner wall of the heat exchange tube and/or the inner surface of the lower tube plate are coated with a corrosion-resistant coating.
Preferably, when the heat exchange tubes and/or the lower tube sheet are made of a polymer, the polymer is selected from the group comprising Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyimide (PI), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyarylsulfone (PASF), and Polyethersulfone (PES).
Preferably, the heat exchange tube is formed by extrusion, glass or polymer round tube extrusion, glass or polymer sheet bonding or welding.
Preferably, the cross section of the heat exchange tube has a plane corresponding to the width thereof substantially in the direction of air flow.
Preferably, the heat exchange tubes are in horizontal cross-section, with the heat exchange tubes aligned in both rows and columns.
Preferably, the heat exchange tubes are in horizontal cross section, and adjacent heat exchange tubes are staggered in rows and columns.
Preferably, the air inlet and the air outlet are opened on the entire portion of the side corresponding to the heat exchange pipe.
Preferably, one of the air inlet and the air outlet is provided at a lower portion of the side portion corresponding to the heat exchange pipe, and the other is provided at an upper portion of the side portion corresponding to the heat exchange pipe.
Preferably, the heat exchanger further comprises n groups of air inlets and air outlets arranged in sequence along the height of the shell, wherein n is an integer greater than or equal to 1, the nth group of air inlets and air outlets and the nth group of upper tube plate and lower tube plate hermetically connected with the shell, and the nth group of heat exchange tubes hermetically held in the assembly holes of the upper tube plate and the lower tube plate of the group are correspondingly arranged, the air inlets and air outlets of the nth group are opened on the whole part of the side part corresponding to the group of heat exchange tubes, or one of the air inlets and air outlets of the nth group is arranged at the lower part of the side part corresponding to the group of heat exchange tubes, the other is arranged at the upper part of the side part corresponding to the group of heat exchange tubes, and the air inlets/air outlets of the nth group of air inlets and air outlets and the air outlets of the previous group of heat exchange tubes which are arranged in series via elbow boxes hermetically connected with the shell.
Preferably, if the smoke received by the nth group of heat exchange tubes is below the dew point temperature after heat exchange with the air entering from the air inlet and exiting from the air outlet via the group of heat exchange tubes, the group of heat exchange tubes and/or the lower tube plate is provided to be made of glass or polymer.
Preferably, a spraying device is arranged above the upper opening of each group of heat exchange pipes and used for spraying liquid, so that the liquid enters the group of heat exchange pipes from the upper openings of the corresponding group of heat exchange pipes to flush the interiors of the group of heat exchange pipes.
The utility model discloses an air heater is through adopting the corrosion-resistant heat exchange tube of at least inner wall, with heat exchange tube vertical layout, it walks intraductally to set up the flue gas, and go into down, make the heat transfer in-process from this, can be intraductal with the flue gas restriction, avoid corroding other spare parts of air heater, and because the flue gas from top to bottom erodees, carry, the corrosivity condensate of production easily discharges from the heat exchange tube, and be favorable to the scale removal, thereby make air heater have self-cleaning function, and the security and the life of the spare part that has improved heat exchange efficiency and the in-process use of heat transfer.
Drawings
FIG. 1 is a schematic view of an air preheater according to a first embodiment of the present invention;
FIG. 2 is a schematic view showing a straight-through heat exchange mode of flue gas in the heat exchange tube and air outside the heat exchange tube at the low temperature section in FIG. 1;
FIG. 3 is a schematic view of an air preheater according to a second embodiment of the present invention;
FIG. 4 is a schematic view showing a countercurrent heat exchange manner of the flue gas in the heat exchange tube and the air outside the heat exchange tube at the low temperature section in FIG. 3;
FIG. 5 is a schematic view of an air preheater according to a third embodiment of the present invention;
FIG. 6 is a schematic view of an arrangement of heat exchange tubes of an air preheater according to the present invention;
FIG. 7 is a schematic view of another arrangement of heat exchange tubes of an air preheater according to the present invention;
fig. 8 is a schematic diagram of various implementations of an air preheater heat exchange tube according to an embodiment of the present invention.
Detailed Description
The present application is described in further detail below. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Fig. 1 is a schematic view of an air preheater according to a first embodiment of the present invention, the air preheater being generally designated by reference numeral 1. The air preheater 1 includes a housing 11, the housing 11 including a top, a bottom, and sides between the top and the bottom.
The air preheater 1 of the embodiment shown in fig. 1 includes a high temperature section and a low temperature section, and since the dew point of the high temperature flue gas requiring heat recovery usually appears at the low temperature section, that is, the corrosion problem of the flue gas condensate only appears at the low temperature section, therefore, the technical problem to be solved by the present invention, in other words, the invention lies in the low temperature section of the air preheater (i.e., the portion where the working temperature range of the heat exchange tube of the air preheater contains the dew point temperature of the flue gas), the specific structure of the high temperature section (i.e., the portion where the working temperature range of the heat exchange tube of the air preheater is higher than the dew point temperature of the flue gas) is not shown, and the general position of the air preheater 1 is shown only through the high temperature section air inlet 113 and the high temperature section air outlet 114. The high-temperature stage air inlet 113 and the low-temperature stage air outlet 112 are hermetically connected by the elbow box 17.
The structure of the low temperature section part of the air preheater 1 is mainly described below with reference to fig. 1.
The air preheater 1 has a top opening 115 arranged to receive flue gas and a lower opening 116 arranged to discharge flue gas. During use, the flue gas firstly passes through the high-temperature section for heat exchange, then enters the low-temperature section for heat exchange, and is finally discharged from the tube pass. In the low-temperature section part, the heat exchange tube 12 of the air preheater 1 is arranged in the shell in a generally vertical mode, the upper tube plate 13 and the lower tube plate 14 are respectively provided with a matching hole for the heat exchange tube to pass through, the edges of the upper tube plate 13 and the lower tube plate 14 are connected to the shell 11 in a sealing mode, and the outer surface of the heat exchange tube 12 passing through the matching hole is connected with the matching hole in a sealing mode. The air inlet 111 and the air outlet 112 are provided at opposite side portions of the shell 11 between the upper tube plate 13 and the lower tube plate 14, respectively. The heat exchange tube 112 has an upper opening configured to receive the flue gas and a lower opening configured to discharge the flue gas, at least an inner wall of the heat exchange tube 112 is corrosion resistant, and the heat exchange tube 112 can be configured such that the flue gas temperature is lower than the dew point temperature after the flue gas is heat exchanged with air introduced from the air inlet 111 and discharged 112 from the air outlet via the heat exchange tube 112.
The utility model discloses in, the inner wall of the heat exchange tube 12 of at least low temperature section is corrosion-resistant, consequently can make the flue gas temperature after the heat transfer be less than its dew point temperature, consequently improve heat exchange efficiency, moreover, because the flow setting of corrosivity flue gas is in the tube side, when flue gas temperature is less than the dew point, the corrosivity condensate is except contacting with the corrosion-resistant inner wall of heat exchange tube 12, almost contactless with other air heater spare part, thereby avoid corroding other spare parts, air heater's security and life have been improved.
Further, because the heat exchange tube 12 standpipe is arranged, the heat exchange tube 12 is discharged with corrosive condensate more easily, and the heat exchange tube 12 inner wall can scale deposit usually, and corrosive condensate can also make the cigarette dirt dissolve, and along with the flue gas goes into down to go out to erode, can also carry the discharge with solid particle and cigarette dirt in the flue gas simultaneously when the condensate is discharged, is equivalent to the cleaning action for air heater has self-cleaning function, is difficult for the deposition scale deposit.
The inner wall of the low-temperature section heat exchange tube can realize corrosion resistance by coating a corrosion-resistant coating, and for example, the inner wall of the low-temperature section heat exchange tube can be a metal heat exchange tube coated with the corrosion-resistant coating. The inner surface of the lower tube sheet 14 may also be corrosion resistant by being coated with a corrosion resistant coating, such as a metal lower tube sheet having an inner surface coated with a corrosion resistant coating. Or the low-temperature section heat exchange tube and/or the lower tube plate are made of metal with corrosion resistance, and preferably, the heat exchange tube 12 and/or the lower tube plate 14 are made of glass or polymer to realize the corrosion resistance. The upper tube plate 13 and the tube plate of the high temperature section may be made of metal.
When the heat exchange tubes 12 and/or the lower tube sheet 14 are made of a polymer, the polymer is selected from the group consisting of Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyimide (PI), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyarylsulfone (PASF), and Polyethersulfone (PES).
When the heat exchange tube 12 is made of glass or polymer, the heat exchange tube 12 may be formed by extrusion molding, extrusion of glass or polymer round tubes into flat tubes, or by bonding or welding glass or polymer sheets.
It is worth noting that, for the heat exchange tube formed by glass or polymer, because the heat exchange tube has excellent compression stress resistance and poor tensile stress resistance, the heat exchange tube formed by glass or polymer is vertically arranged, the compression stress resistance can be exerted again, the defect of poor tensile stress resistance is avoided, and the service life and the reliability of the heat exchange tube formed by glass or polymer are effectively improved.
Similarly, for the heat exchange tube formed by glass or polymer, in the working process, the flue gas is taken away from the tube pass, and the heat exchange tube formed by glass or polymer can be in a negative pressure state due to high flue gas temperature and low air temperature outside the tube, so that the pressure resistance of the heat exchange tube can be exerted again, the defect of poor tensile stress performance of the heat exchange tube can be avoided, and the service life and the reliability of the heat exchange tube formed by glass or polymer can be effectively improved.
As can also be seen in fig. 1, a condensate and soot collection and discharge device 15 is further disposed below the lower opening of the heat exchange tube 12, and the condensate and soot collection and discharge device 15 is detachable or has a discharge port for removing the condensate and soot.
Also shown in fig. 1, a spray device 16 is also provided above the upper opening of the heat exchange tube 12 for spraying liquid into the heat exchange tube from the upper opening of the heat exchange tube 12 to flush the interior of the heat exchange tube.
Similarly, if necessary, a spraying device can be arranged above the upper opening of the high-temperature section heat exchange tube and used for spraying liquid, so that the liquid enters the high-temperature section heat exchange tube from the upper opening of the high-temperature section heat exchange tube to flush the inside of the high-temperature section heat exchange tube.
It should be noted that, in this embodiment, the air inlet 111 and the air outlet 112 of the low temperature section are opened on the whole part of the side portion of the casing 11 of the air preheater 1 corresponding to the heat exchange tube 12, that is, in this embodiment, the heat exchange between the flue gas in the heat exchange tube 12 of the low temperature section and the air outside the heat exchange tube 12 is a straight heat exchange. However, in the high temperature section, the air inlet 113 is disposed at the lower part of the portion of the side of the casing 11 of the air preheater 1 corresponding to the heat exchange tube, and the air outlet 114 is disposed at the upper part of the portion of the side of the casing 11 corresponding to the heat exchange tube, that is, in this embodiment, the heat exchange manner between the flue gas in the heat exchange tube of the high temperature section and the air outside the heat exchange tube is countercurrent heat exchange.
FIG. 2 is a schematic view showing a straight-through heat exchange mode of flue gas in the heat exchange tube and air outside the heat exchange tube at the low temperature section in FIG. 1. Only the low temperature section portion of the heat exchanger is shown, flue gas entering the low temperature section portion is indicated by reference numeral 18 and solid arrows, air entering the low temperature section portion is indicated by reference numeral 19 and hollow arrows, and the heat exchange tubes 12 are held upright in the shell of the low temperature section portion of the heat exchanger by an upper tube sheet 13 and a lower tube sheet (not shown). The flue gas 18 enters the interior of the heat exchange tube 12 from the upper part of the low-temperature section part and flows out from the lower part of the low-temperature section part. The air inlet 111 is provided on the whole portion of the side of the low temperature stage part corresponding to the heat exchange tube 12, and also the air outlet, although not shown, is provided on the whole portion of the side of the low temperature stage part corresponding to the heat exchange tube 12. Air 19 enters the low-temperature-section part through an air inlet 111, passes through a gap between the heat exchange pipe 12 and the shell of the low-temperature-section part, and directly flows out from an air outlet. Fig. 2 shows in more detail the direct heat exchange between the flue gas 18 in the low temperature section part of the heat exchange tube 12 and the air 19 outside the heat exchange tube 12.
Fig. 3 is a schematic view of an air preheater according to a second embodiment of the present invention, the air heat exchanger being generally designated by reference numeral 2. The air preheater 2 of this second embodiment differs from the air preheater 1 of the first embodiment only in the arrangement of the low temperature section air inlet and air outlet, and is otherwise identical to the air preheater 1 of the first embodiment. Like parts in fig. 3 bear the same reference numerals as in fig. 1, and for the sake of distinction only the first digit on the left is incremented by 1. The differences between the air preheater 2 of the second embodiment and the air preheater 1 of the first embodiment will be described below with reference to the drawings only, and other structures will not be described in detail.
The low-temperature section air inlet 211 of the air preheater 2 of the second embodiment shown in fig. 3 is arranged at the lower part of the side of the housing 211 of the air preheater 2 corresponding to the heat exchange tube 22, and the low-temperature section air outlet 212 is arranged at the upper part of the side of the housing 211 corresponding to the heat exchange tube 22, that is, in this embodiment, the low-temperature section heat exchange tube exchanges heat with air in a counter-flow heat exchange manner.
FIG. 4 is a schematic view showing a countercurrent heat exchange manner between the flue gas in the heat exchange tube of the low temperature section and the air outside the heat exchange tube in FIG. 3. Only the low temperature section portion of the heat exchanger is shown, flue gas entering the low temperature section portion is indicated by reference numeral 28 and solid arrows, air entering the low temperature section portion is indicated by reference numeral 29 and hollow arrows, and the heat exchange tubes 22 are held upright in the shell of the low temperature section portion of the heat exchanger by an upper tube sheet 23 and a lower tube sheet (not shown). The flue gas 28 enters the interior of the heat exchange tube 22 from the upper part of the low-temperature section part and flows out from the lower part of the low-temperature section part. The air inlet 211 is provided at a lower portion of a portion of the side of the low temperature stage part corresponding to the heat exchange pipe 22, and the air outlet, not shown, is provided at an upper portion of a portion of the side of the low temperature stage part corresponding to the heat exchange pipe 22. Air 29 enters the low temperature stage part through the air inlet 211 and then needs to flow from the lower portion to the upper portion of the low temperature stage part through the gap between the heat exchange pipe 22 and the shell of the low temperature stage part and finally flows out from the air outlet located at the upper portion of the side opposite to the air inlet 211. Therefore, in the process that the air 29 flows from the lower part to the upper part of the low-temperature section, the flue gas 28 flowing from the upper part to the lower part in the heat exchange tube 22 carries out the countercurrent heat exchange, so the heat exchange mode of the flue gas 28 in the heat exchange tube 22 of the low-temperature section and the air 19 outside the heat exchange tube 22 is called the countercurrent heat exchange.
The reverse flow heat exchange manner and the arrangement manner of the air inlet and the air outlet of the high temperature section part are the same as those of the low temperature section part described with reference to fig. 4, and the description thereof will not be repeated.
Fig. 5 is a schematic diagram of an air preheater according to a third embodiment of the present invention, the air heat exchanger being generally indicated by reference numeral 3. The air preheater 3 of this third embodiment differs from the air preheater 1 of the first embodiment only in that the low temperature section is divided into a first low temperature section and a second low temperature section, and is otherwise identical to the air preheater 1 of the first embodiment. Like parts in fig. 5 bear the same reference numerals as in fig. 1, with only the first digit on the left being incremented by 2 for the sake of distinction. The differences between the air preheater 3 of the third embodiment and the air preheater 1 of the first embodiment will be described below with reference to the drawings only, and other structures will not be described in detail.
The low temperature section of the air preheater 3 of the third embodiment shown in fig. 5 comprises a first low temperature section and a second low temperature section, the second low temperature section having a higher flue gas temperature than the first low temperature section. The air inlet 311 of the first low temperature section is disposed on the whole portion of the side of the housing 311 of the air preheater 3 corresponding to the heat exchange tube 32, and the air outlet 312 of the first low temperature section is disposed on the whole portion of the side of the housing 311 corresponding to the heat exchange tube 32, that is, in this embodiment, the heat exchange manner of the first low temperature section heat exchange tube 32 with the air is a countercurrent heat exchange. The air inlet 311' of the second low temperature section is provided on the entire portion of the side of the housing 311 of the air preheater 3 corresponding to the heat exchange tube 32', and the air outlet 312' of the second low temperature section is provided on the entire portion of the side of the housing 311 corresponding to the heat exchange tube 32', that is, in this embodiment, the heat exchange manner of the second low temperature section heat exchange tube 32' with the air is the reverse flow heat exchange. A spray device 36 is disposed above the upper opening of the first low-temperature section heat exchange tube 32, and a spray device 36' is also disposed above the upper opening of the second low-temperature section heat exchange tube 32' for spraying liquid so that the liquid enters the heat exchange tube from the upper opening of the heat exchange tube 32 or 32' to flush the inside of the heat exchange tube.
According to the utility model discloses an air heater still can have multiple deformation form, for example, air heater can include a plurality of high temperature sections, and each high temperature section includes a set of heat exchange tube. Specifically, the upper part of the upper tube plate of the low temperature section further comprises n groups of air inlets and air outlets which are sequentially arranged along the height of the shell body upwards, wherein n is an integer greater than or equal to 1, the nth group of air inlets and air outlets and the nth group of upper tube plate and lower tube plate which are hermetically connected with the shell body are correspondingly arranged, the nth group of heat exchange tubes are hermetically held in the assembly holes of the upper tube plate and the lower tube plate of the group, the nth group of air inlets and air outlets are opened on the whole part of the side part of the shell body corresponding to the group of heat exchange tubes, or one of the nth group of air inlets and air outlets is arranged at the lower part of the side part corresponding to the group of heat exchange tubes, the other is arranged at the upper part of the side part corresponding to the group of heat exchange tubes, and the air inlet/air outlet at the lower part of the nth group of air inlets and air outlets is arranged in series with the air outlet/air inlet at the upper part of the previous group of heat exchange tubes through a elbow box which is hermetically connected with the shell body.
If the temperature of the flue gas received by the nth group of heat exchange tubes is lower than the dew point temperature after the flue gas is heat exchanged with the air entering from the air inlet and exiting from the air outlet via the group of heat exchange tubes, the group of heat exchange tubes and/or the lower tube plate are configured to be made of glass or polymer.
And a spraying device is arranged above the upper opening of each group of heat exchange tubes and is used for spraying liquid, so that the liquid enters the group of heat exchange tubes from the upper opening of the corresponding group of heat exchange tubes to flush the insides of the group of heat exchange tubes.
The utility model discloses an air heater also can only include the low temperature section part. The utility model discloses an air heater low temperature section also can realize by the countercurrent flow heat transfer mode.
The utility model discloses an air heater structure is not limited to above air heat exchanger's embodiment and deformation form, can realize the utility model discloses other air heater structures of principle are also in the utility model discloses the within range.
Fig. 6 is a schematic diagram showing an arrangement of heat exchange tubes of an air preheater according to the present invention, showing a cross-section 1000 taken through a horizontal plane passing through the heat exchange tube portion of the air preheater. Fig. 7 is a schematic view of another arrangement of heat exchange tubes of an air preheater according to the present invention, showing a cross-section 2000 taken through a horizontal plane through the heat exchange tube portions of the air preheater. Referring to fig. 6 and 7, the longer side of the cross-section of the heat exchange tubes 1001, 2001 represents the width of the heat exchange tubes 1001, 2001, and the shorter side represents the height of the heat exchange tubes 1001, 2001. In practice, the faces corresponding to the width of the heat exchange tubes 1001, 2001 are generally arranged to substantially coincide with the air flow direction.
In contrast, in fig. 6, the heat exchange tubes 1001 are shown aligned in both rows and columns, referred to as an in-line configuration, while in fig. 7, adjacent heat exchange tubes are staggered in rows and columns, referred to as a staggered configuration.
The utility model discloses an air heater's heat exchange tube can take in the same direction as arranging any kind in structure and the staggered arrangement structure, and the optimal combination improves heat transfer performance, does not influence the utility model discloses a realization.
Fig. 8 is a schematic diagram of various implementations of an air preheater heat exchange tube according to an embodiment of the present invention.
The utility model discloses the heat exchange tube preferably has high-efficient heat transfer performance's non-circular section tubular component, as shown in fig. 8, heat exchange tube 100 is for having the flat pipe of raindrop form cross section, heat exchange tube 200 is for having the flat pipe of rectangle cross section, heat exchange tube 300 is for having the flat pipe that the intermediate part is parallel straight flange, both ends are curved cross section, heat exchange tube 400 is for having the flat pipe of flat oval cross section, it is the flat pipe that the width of cross section is greater than the height, preferably, the width of cross section and the ratio more than or equal to 5 of height.
The present application thus also provides a method of medium heat exchange, comprising:
arranging two openings of a heat exchange tube of a shell-and-tube heat exchanger up and down to form an upper opening and a lower opening;
the heat exchange tube is provided with at least the inner wall with corrosion resistance;
the method comprises the following steps of receiving a first medium with corrosivity and a condensation point by using a heat exchange tube, enabling the first medium to enter from an opening at the upper part of the heat exchange tube and flow out from an opening at the lower part of the heat exchange tube, receiving a second medium by using a shell of the heat exchanger, and enabling the first medium and the second medium to be isolated from each other and exchange heat through the wall of the heat exchange tube;
the temperature of the first medium in the heat exchange tubes is set higher than the temperature of the second medium and the temperature of the first medium is lower than the condensation point before being discharged from the lower opening.
In the medium heat exchange method, the heat exchange tube is made of glass or polymer material.
According to the medium heat exchange method, at least the heat exchange tube with the corrosion-resistant inner wall is adopted, the heat exchange tube is vertically arranged, the smoke is arranged to flow in the tube and flow out from top to bottom, so that the smoke can be limited in the tube in the heat exchange process, other parts of the air preheater are prevented from being corroded, and the generated corrosive condensate is easy to discharge from the heat exchange tube due to the fact that the smoke is washed and carried from top to bottom, and is beneficial to descaling, so that the air preheater has a self-cleaning function, and the safety and the service life of the parts used in the heat exchange efficiency and the heat exchange process are improved.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be understood by those skilled in the art that the scope of the present invention is not limited to the specific combination of the above-mentioned features, but also covers other embodiments formed by any combination of the above-mentioned features or their equivalents without departing from the spirit of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (16)
1. An air preheater, comprising:
a housing including a top portion, a bottom portion, and a side portion between the top portion and the bottom portion;
the heat exchange tube is vertically arranged in the shell;
the upper tube plate and the lower tube plate are respectively provided with a matching hole for the heat exchange tube to pass through, the edges of the upper tube plate and the lower tube plate are hermetically connected to the shell, and the outer surface of the heat exchange tube passing through the matching hole is hermetically connected with the matching hole; and
an air inlet and an air outlet respectively arranged at two opposite side parts of the shell between the upper tube plate and the lower tube plate,
wherein the upper opening of the heat exchange tube is arranged for receiving flue gas, the lower opening is arranged for discharging flue gas, at least the inner wall of the heat exchange tube is corrosion resistant, the heat exchange tube can be arranged such that the flue gas temperature is lower than the dew point temperature after the flue gas is heat exchanged with air entering from the air inlet and being discharged from the air outlet via the heat exchange tube.
2. An air preheater as recited in claim 1, wherein a condensate and soot collecting and discharging device is further provided below the lower opening of said heat exchange tube, said condensate and soot collecting and discharging device being removable or having a discharge port.
3. An air preheater as recited in claim 1 or claim 2 wherein said heat exchange tubes are further provided with spray means above the upper openings thereof for spraying liquid into the heat exchange tubes from the upper openings thereof to flush the interior of the heat exchange tubes.
4. An air preheater as recited in claim 1, wherein said heat exchange tubes are flat tubes having a cross-sectional width greater than a height.
5. An air preheater as recited in claim 4, wherein the ratio of the width to the height of the cross-section is greater than or equal to 5.
6. An air preheater as claimed in claim 4 or 5, wherein the heat exchange tubes and/or the lower tube sheet are made of metal, glass or polymer having corrosion resistance, or the inner walls of the heat exchange tubes and/or the inner surface of the lower tube sheet are coated with a corrosion-resistant coating.
7. An air preheater according to claim 6, wherein when the heat exchange tubes and/or the lower tube sheet are made of a polymer, the polymer is selected from the group consisting of Polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), polyimide (PI), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyarylsulfone (PASF) and Polyethersulfone (PES).
8. An air preheater as claimed in claim 6, wherein said heat exchange tubes are formed by extrusion, glass or polymer round tube extrusion, glass or polymer sheet bonding or welding.
9. An air preheater as claimed in claim 4 or 5, wherein the width of the cross-section of the heat exchange tube corresponds to a face substantially aligned with the direction of air flow.
10. An air preheater as claimed in claim 1 or 2, wherein the heat exchange tubes are in horizontal cross-section, the heat exchange tubes being aligned in both rows and columns.
11. An air preheater as claimed in claim 1 or claim 2, wherein the heat exchange tubes are in horizontal cross-section with adjacent heat exchange tubes staggered in rows and columns.
12. An air preheater according to claim 1, wherein the air inlet and the air outlet are opened to the entire portion of the side portion corresponding to the heat exchange tube.
13. An air preheater according to claim 1, wherein one of the air inlet and the air outlet is provided at a lower portion of the side portion corresponding to the heat exchange tube, and the other is provided at an upper portion of the side portion corresponding to the heat exchange tube.
14. An air preheater according to claim 12 or 13, further comprising n sets of air inlets and air outlets arranged in this order upward along the height of the shell above the upper tube plate, n being an integer of 1 or more, the nth set of air inlets and air outlets and the nth set of upper tube plate and lower tube plate sealingly connected to the shell and the nth set of heat exchange tubes sealingly held in fitting holes of the set of upper tube plate and lower tube plate being disposed correspondingly, the air inlets and air outlets of the nth set being opened over the entire portion of the side portion corresponding to the set of heat exchange tubes, or one of the air inlets and air outlets of the nth set being disposed at a lower portion of the side portion corresponding to the set of heat exchange tubes and the other being disposed at an upper portion of the side portion corresponding to the set of heat exchange tubes, and the air inlets/outlets of the nth set being disposed in series with the air outlets/air inlets of the previous set of heat exchange tubes via an elbow box sealingly connected to the shell.
15. An air preheater according to claim 14, wherein if the temperature of the flue gas received by the nth group of heat exchange tubes is below the dew point temperature after heat exchange via the group of heat exchange tubes with the air entering from the air inlet and exiting from the air outlet, the group of heat exchange tubes and/or the lower duct plate is provided to be made of glass or polymer.
16. An air preheater as recited in claim 14, wherein spray means are provided above the upper openings of each of the heat exchange tubes for spraying liquid into the heat exchange tubes from the upper openings of the respective heat exchange tubes to flush the interiors of the heat exchange tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221717047.6U CN217843924U (en) | 2022-07-04 | 2022-07-04 | Air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221717047.6U CN217843924U (en) | 2022-07-04 | 2022-07-04 | Air preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217843924U true CN217843924U (en) | 2022-11-18 |
Family
ID=84034121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221717047.6U Active CN217843924U (en) | 2022-07-04 | 2022-07-04 | Air preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217843924U (en) |
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2022
- 2022-07-04 CN CN202221717047.6U patent/CN217843924U/en active Active
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