CN107702084B - Low-temperature economizer of power plant - Google Patents

Low-temperature economizer of power plant Download PDF

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Publication number
CN107702084B
CN107702084B CN201711078683.2A CN201711078683A CN107702084B CN 107702084 B CN107702084 B CN 107702084B CN 201711078683 A CN201711078683 A CN 201711078683A CN 107702084 B CN107702084 B CN 107702084B
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China
Prior art keywords
heat exchange
flue
exchange tube
exhaust
air
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CN107702084A (en
Inventor
谭梦磊
陈金龙
黄岳军
李俊
谭海江
赵虎
赵文涛
糜晓航
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Jiangyin Denaite Heavy Industry Science & Technology Co ltd
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Jiangyin Denaite Heavy Industry Science & Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
    • F22D1/04—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways the tubes having plain outer surfaces, e.g. in vertical arrangement
    • F22D1/06—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways the tubes having plain outer surfaces, e.g. in vertical arrangement in horizontal arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • 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
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention discloses a low-temperature economizer of a power plant, which comprises a flue and a heat exchange tube panel fixed in the flue; the heat exchange tube panel is cuboid, an auxiliary heat exchange tube group is arranged in the middle of the upper end and/or the middle of the lower end of the heat exchange tube panel, the auxiliary heat exchange tube group comprises a plurality of U-shaped auxiliary heat exchange tubes, and two ends of each auxiliary heat exchange tube are communicated with adjacent heat exchange tubes. Through such design, through set up at rectangular bodily form heat exchange tube panel upper end and lower extreme and attach the heat exchange tube group, can utilize the partial space in air inlet taper pipe coupling and exhaust taper pipe coupling originally, improve heat transfer area, and then improve heat exchange efficiency and heat transfer effect, can further reduce the energy consumption.

Description

Low-temperature economizer of power plant
Technical Field
The invention relates to a low-temperature economizer for a power plant.
Background
In order to reduce the exhaust gas temperature, reduce the exhaust gas loss and improve the operation economy of a power plant, a low-temperature economizer adopting a cooling medium with a lower temperature is commonly and additionally arranged on a tail flue of a boiler in the industry at present. The existing low-temperature economizer is in a cuboid shape and is installed in a widened local flue, the upper space and the lower space of the connecting position of the flue are wasted, the heat exchange effect is not improved, and the prior art urgently needs a power plant low-temperature economizer for improving the heat exchange effect in the flue.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a low-temperature economizer of a power plant, which can improve the heat exchange effect in a flue.
In order to achieve the purpose, the technical scheme of the invention provides a low-temperature economizer for a power plant, which comprises a flue and a heat exchange tube panel fixed in the flue, wherein the flue comprises an air inlet flue, a heat exchange flue and an exhaust flue which are sequentially arranged along the flow direction of flue gas, and the air inlet flue and the exhaust flue are respectively communicated with the heat exchange flue through an air inlet bent pipe and an exhaust bent pipe; the heat exchange flue has a pipe diameter larger than that of the air inlet bent pipe and the air outlet bent pipe, and is correspondingly connected with the air inlet bent pipe and the air outlet bent pipe through an air inlet conical pipe joint and an air outlet conical pipe joint respectively; the heat exchange tube panel is fixed on the inner wall of the heat exchange flue through a heat exchange tube panel support and consists of a plurality of bent and circuitous heat exchange tubes in rows, and two ends of the heat exchange tubes are communicated with the water inlet main pipe and the water outlet main pipe; the heat exchange tube panel is cuboid, an auxiliary heat exchange tube group is arranged in the middle of the upper end and/or the middle of the lower end of the heat exchange tube panel, the auxiliary heat exchange tube group comprises a plurality of U-shaped auxiliary heat exchange tubes, and two ends of each auxiliary heat exchange tube are communicated with adjacent heat exchange tubes.
Through such design, through set up at rectangular bodily form heat exchange tube panel upper end and lower extreme and attach the heat exchange tube group, can utilize the partial space in air inlet taper pipe coupling and exhaust taper pipe coupling originally, improve heat transfer area, and then improve heat exchange efficiency and heat transfer effect, can further reduce the energy consumption.
Preferably, the additional heat exchange tubes in the middle of the upper end of the heat exchange tube panel are bent upwards and accommodated in the exhaust conical tube joint, and the additional heat exchange tubes are arranged in rows and are communicated with the heat exchange tubes arranged in rows correspondingly. The design can better arrange the attached heat exchange tube inside the exhaust conical tube joint, the heat exchange area is increased when the flue gas finally leaves the flue, the attached heat exchange tube is directly communicated with the heat exchange tube, so that the installation and the modification are easy, and the modification can be carried out on the existing economizer.
Preferably, the auxiliary heat exchange tubes in the middle of the lower end of the heat exchange tube panel are bent downwards and accommodated in the air inlet conical tube joint, and the auxiliary heat exchange tubes are arranged in rows and are communicated with the heat exchange tubes arranged in rows correspondingly. The design can better arrange the attached heat exchange tube inside the air inlet conical tube joint, the heat exchange area is increased when the flue gas just enters the flue, the attached heat exchange tube is directly communicated with the heat exchange tube, so that the installation and the modification are easy, and the modification can be carried out on the existing economizer.
Preferably, the outer walls of the heat exchange tubes and the heat exchange tubes are welded with H-shaped fins or metal spiral fins. Such a design can further improve the heat exchange effect.
Preferably, a plurality of air pressure regulators with variable volumes are uniformly distributed on the outer wall surrounding the exhaust conical pipe, the inner end openings of the air pressure regulators are communicated with the inside of the exhaust conical pipe, and the connection positions of the air pressure regulators are arranged in a sealing mode. Such a design allows for the adjustment of the air pressure and flow rate within the flue by adjusting the volume of the air pressure regulator to achieve the best heat exchange effect.
Preferably, a plurality of air pressure regulators with variable volumes are uniformly distributed on the outer wall surrounding the air inlet conical pipe, the inner end openings of the air pressure regulators are communicated with the interior of the air outlet conical pipe, and the connecting positions of the air pressure regulators are arranged in a sealing mode. Such a design allows for the adjustment of the air pressure and flow rate within the flue by adjusting the volume of the air pressure regulator to achieve the best heat exchange effect. And the air pressure regulator on the outer wall of the air inlet conical pipe can be matched with the air pressure regulator on the outer wall of the exhaust conical pipe for regulation, so that the regulation effect is further improved.
Preferably, the air pressure regulator comprises a first regulating cylinder, the side wall of the first regulating cylinder is a telescopic corrugated wall, the middle part of the bottom plate of the first regulating cylinder is connected with a first deformation air cylinder, openings connected with the air pressure regulator are formed in the exhaust conical pipe and the air inlet conical pipe respectively, a first connecting rod is fixed on each opening, and the end part of an output rod of the first deformation air cylinder is connected with the middle part of the first connecting rod. The design can change the volume of the adjusting cylinder through the driving of the deformation cylinder to adjust the air pressure in the flue, thereby playing the role of adjusting the flue gas wind speed.
Preferably, the air pressure regulator comprises a second regulating cylinder, a sliding plate is connected in the second regulating cylinder in a sliding mode along the axial direction, a sealing air ring is arranged on the outer edge of the sliding plate and is tightly pressed between the outer edge of the sliding plate and the inner wall of the second regulating cylinder, a second deformation air cylinder is connected to the middle of the sliding plate, openings connected with the air pressure regulator are formed in the exhaust conical pipe and the air inlet conical pipe respectively, a second connecting rod is fixed to the openings, and the end portion of an output rod of the second deformation air cylinder is connected to the middle of the second connecting rod. The design can change the volume of the adjusting cylinder through the driving of the deformation cylinder to adjust the air pressure in the flue, thereby playing the role of adjusting the flue gas wind speed.
Preferably, an outer cover body is further fixed to the bottom of the second adjusting cylinder, an air hole is formed in the outer cover body, a guide rod is further arranged on the outer end face of the sliding plate, a guide hole is formed in the outer cover body, and the guide rod is connected with the guide hole in a sliding fit mode. Such a design makes the sliding plate slide more stably.
The invention has the advantages and beneficial effects that: through such design, through set up at rectangular bodily form heat exchange tube panel upper end and lower extreme and attach the heat exchange tube group, can utilize the partial space in air inlet taper pipe coupling and exhaust taper pipe coupling originally, improve heat transfer area, and then improve heat exchange efficiency and heat transfer effect, can further reduce the energy consumption.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the heat exchange tube panel and the attached heat exchange tube of the present invention;
FIG. 3 is a schematic structural view of an air pressure regulator according to embodiment 2;
fig. 4 is a schematic structural diagram of an air pressure regulator in embodiment 3.
In the figure: 1. a heat exchange tube panel; 2. an air intake flue; 3. an air inlet bent pipe; 4. an air inlet taper pipe joint; 5. a heat exchange flue; 6. an exhaust conical pipe joint; 7. an exhaust elbow; 8. an exhaust flue; 9. a heat exchange pipe; 10. a water inlet main pipe; 11. a water outlet main pipe; 12. a heat exchange tube set is attached; 13. an additional heat exchange pipe; 14. a pressure regulator; 15. a first adjustment barrel; 16. a telescoping corrugated wall; 17. a first deforming cylinder; 18. a first connecting rod; 19. a second adjustment barrel; 20. a sliding plate; 21. sealing the air ring; 22. a second deforming cylinder; 23. a second connecting rod; 24. an outer cover body; 25. a guide rod.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 to 4, the low-temperature economizer for the power plant comprises a flue and a heat exchange tube panel 1 fixed in the flue, wherein the flue comprises an air inlet flue 2, a heat exchange flue 5 and an exhaust flue 8 which are sequentially arranged along the flow direction of flue gas, and the air inlet flue 2 and the exhaust flue 8 are respectively communicated with the heat exchange flue 5 through an air inlet bent pipe 3 and an exhaust bent pipe 7; the pipe diameter of the heat exchange flue 5 is larger than that of the air inlet elbow 3 and the air outlet elbow 7, and the heat exchange flue 5 is correspondingly connected with the air inlet elbow 3 and the air outlet elbow 7 through an air inlet conical pipe joint 4 and an air outlet conical pipe joint 6 respectively; the heat exchange tube panel 1 is fixed on the inner wall of a heat exchange flue 5 through a heat exchange tube panel 1 support, the heat exchange tube panel 1 is composed of a plurality of bent and circuitous heat exchange tubes 9 in rows, and two ends of the heat exchange tubes 9 are communicated with a water inlet main pipe 10 and a water outlet main pipe 11; the heat exchange tube panel 1 is rectangular, an attached heat exchange tube group 12 is arranged in the middle of the upper end and/or the middle of the lower end of the heat exchange tube panel 1, the attached heat exchange tube group 12 comprises a plurality of U-shaped attached heat exchange tubes 13, and two ends of each attached heat exchange tube 13 are communicated with adjacent heat exchange tubes 9.
The heat exchange tube panel 1 is characterized in that the auxiliary heat exchange tubes 13 in the middle of the upper end are bent upwards and are accommodated in the exhaust conical tube joint 6, and the auxiliary heat exchange tubes 13 are arranged in rows and are communicated with the corresponding heat exchange tubes 9 arranged in rows.
The auxiliary heat exchange tubes 13 in the middle of the lower end of the heat exchange tube panel 1 are bent downwards and are accommodated in the air inlet conical tube joint 4, and the auxiliary heat exchange tubes 13 are arranged in rows and are communicated with the heat exchange tubes 9 arranged in rows correspondingly.
And H-shaped fins or metal spiral fins are welded on the outer walls of the auxiliary heat exchange tube 13 and the heat exchange tube 9.
A plurality of air pressure regulators 14 with variable volumes are uniformly distributed on the outer wall of the exhaust conical pipe, openings at the inner ends of the air pressure regulators are communicated with the interior of the exhaust conical pipe, and the connection positions of the air pressure regulators are arranged in a sealing mode.
A plurality of air pressure regulators 14 with variable volumes are uniformly distributed on the outer wall of the air inlet conical pipe, the inner end openings of the air pressure regulators 14 are communicated with the interior of the air outlet conical pipe, and the connecting positions of the air pressure regulators are arranged in a sealing mode.
The air pressure regulator 14 comprises a first regulating cylinder 15, the side wall of the first regulating cylinder 15 is a telescopic corrugated wall 16, the middle of the bottom plate of the first regulating cylinder 15 is connected with a first deformation air cylinder 17, openings connected with the air pressure regulator 14 are formed in the exhaust conical pipe and the air inlet conical pipe, a first connecting rod 18 is fixed on the openings, and the end part of an output rod of the first deformation air cylinder 17 is connected with the middle of the first connecting rod 18.
The air pressure regulator 14 comprises a second regulating cylinder 19, a sliding plate 20 is connected in the second regulating cylinder 19 in a sliding mode along the axial direction, a sealing air ring 21 is arranged on the outer edge of the sliding plate 20, the sealing air ring 21 is tightly pressed between the outer edge of the sliding plate 20 and the inner wall of the second regulating cylinder 19, a second deformation air cylinder 22 is connected to the middle of the sliding plate 20, openings connected with the air pressure regulator 14 are formed in the exhaust conical pipe and the air inlet conical pipe, a second connecting rod 23 is fixed to the openings, and the end portion of an output rod of the second deformation air cylinder 22 is connected to the middle of the second connecting rod 23.
An outer cover body 24 is further fixed to the bottom of the second adjusting cylinder 19, an air hole is formed in the outer cover body 24, a guide rod 25 is further arranged on the outer end face of the sliding plate 20, a guide hole is formed in the outer cover body 24, and the guide rod 25 is connected with the guide hole in a sliding fit mode.
Example 1
A low-temperature economizer of a power plant comprises a flue and a heat exchange tube panel 1 fixed in the flue, wherein the flue comprises an air inlet flue 2, a heat exchange flue 5 and an exhaust flue 8 which are sequentially arranged along the flowing direction of flue gas, and the air inlet flue 2 and the exhaust flue 8 are respectively communicated with the heat exchange flue 5 through an air inlet bent pipe 3 and an exhaust bent pipe 7; the pipe diameter of the heat exchange flue 5 is larger than that of the air inlet bent pipe 3 and the air exhaust bent pipe 7, and the heat exchange flue 5 is correspondingly connected with the air inlet bent pipe 3 and the air exhaust bent pipe 7 through an air inlet conical pipe joint 4 and an air exhaust conical pipe joint 6 respectively; the heat exchange tube panel 1 is fixed on the inner wall of a heat exchange flue 5 through a heat exchange tube panel 1 support, the heat exchange tube panel 1 is composed of a plurality of bent and circuitous heat exchange tubes 9 in rows, and two ends of the heat exchange tubes 9 are communicated with a water inlet main pipe 10 and a water outlet main pipe 11; the heat exchange tube panel 1 is cuboid, an auxiliary heat exchange tube group 12 is arranged in the middle of the upper end and/or the middle of the lower end of the heat exchange tube panel 1, the auxiliary heat exchange tube group 12 comprises a plurality of U-shaped auxiliary heat exchange tubes 13, and two ends of each auxiliary heat exchange tube 13 are communicated with the adjacent heat exchange tubes 9.
The heat exchange tube panel 1 is characterized in that the auxiliary heat exchange tubes 13 in the middle of the upper end are bent upwards and are accommodated in the exhaust conical tube joint 6, and the auxiliary heat exchange tubes 13 are arranged in rows and are communicated with the corresponding heat exchange tubes 9 arranged in rows.
The auxiliary heat exchange tubes 13 in the middle of the lower end of the heat exchange tube panel 1 are bent downwards and are accommodated in the air inlet conical tube joint 4, and the auxiliary heat exchange tubes 13 are arranged in rows and are communicated with the heat exchange tubes 9 arranged in rows correspondingly.
And H-shaped fins or metal spiral fins are welded on the outer walls of the auxiliary heat exchange tube 13 and the heat exchange tube 9.
When the heat exchange tube panel is used, smoke flows from the directions of the air inlet flue 2, the air inlet bent tube 3, the air inlet conical tube joint 4, the heat exchange flue 5, the air outlet conical tube joint 6, the air outlet bent tube 7 and the air outlet flue 8, and the heat exchange tube panel 1 is cuboid-shaped and fixed on the inner wall of the heat exchange flue 5 through the heat exchange tube panel 1 support; when flowing through the heat exchange tube panel 1, the flue gas is subjected to heat exchange with a low-temperature medium (condensed water) in the heat exchange tube 9, the condensed water absorbs heat of exhaust smoke in the heat exchange tube panel 1, the temperature of the exhaust smoke is reduced, and the exhaust smoke is heated and then returns to a low-pressure heater system of the steam turbine to replace part of low-pressure heaters. Under the condition that the generated energy is not changed, the energy consumption of the unit can be saved. Meanwhile, the smoke temperature entering the desulfurizing tower is reduced, so that the consumption of the desulfurizing process water can be saved. In order to further improve the heat exchange area, an additional heat exchange tube group 12 is arranged in the middle of the upper end and the middle of the lower end of the heat exchange tube panel 1, the additional heat exchange tube group 12 comprises a plurality of U-shaped additional heat exchange tubes 13, and two ends of each additional heat exchange tube 13 are communicated with the adjacent heat exchange tube 9.
The auxiliary heat exchange tubes 13 are accommodated in the exhaust conical tube joint 6 and the air inlet conical tube joint 4, the original vacant space is utilized, the heat exchange area is increased, and the heat exchange effect is improved.
Example 2
According to further optimization of the embodiment 1, a plurality of air pressure regulators 14 with variable volumes are uniformly distributed on the outer wall of the exhaust conical pipe, openings at the inner ends of the air pressure regulators are communicated with the interior of the exhaust conical pipe, and the connection positions are arranged in a sealing mode.
A plurality of air pressure regulators 14 with variable volumes are uniformly distributed on the outer wall of the air inlet conical pipe in a surrounding mode, openings at the inner ends of the air pressure regulators 14 are communicated with the interior of the air outlet conical pipe, and the connecting positions of the air pressure regulators are arranged in a sealing mode.
The air pressure regulator 14 comprises a first regulating cylinder 15, the side wall of the first regulating cylinder 15 is a telescopic corrugated wall 16, the middle of the bottom plate of the first regulating cylinder 15 is connected with a first deformation air cylinder 17, openings connected with the air pressure regulator 14 are formed in an exhaust conical pipe and an air inlet conical pipe, a first connecting rod 18 is fixed on the openings, and the end part of an output rod of the first deformation air cylinder 17 is connected with the middle part of the first connecting rod 18.
Under an ideal state, the air pressure difference in the heat exchange flue 5 is stable, the flow rate of the flue gas is approximately constant, the flow rates of media in the heat exchange tube 9 and the attached heat exchange tube 13 are stable, and the best heat exchange effect can be achieved only by matching reasonable flue gas flow rate with certain medium flow rate. However, in use, the pressure of the flue gases entering the heat exchange flue 5 will vary, and if the pressure is too high, heat will not be exchanged and will be discharged from the exhaust flue 8, and if the pressure is too low, the heat exchange efficiency will be too low, and the medium will flow through without raising the temperature to the predetermined temperature. In this application, set up a plurality of gas pressure regulators 14 on with exhaust conical tube and the conical tube that admits air, 5 atmospheric pressure in heat transfer flue are too high, and when the flue gas velocity of flow was too fast, the gas pressure regulator 14 on the exhaust conical tube progressively compressed the volume, and the gas pressure regulator 14 on the conical tube that admits air progressively enlarges the volume for temporarily produce in heat transfer flue 5 and offset the air current, reduce the flue gas velocity, control the heat exchange effect.
On the contrary, when the flow rate of the flue gas is too low, the volume of the gas pressure regulator 14 on the exhaust conical pipe is gradually enlarged, and the volume of the gas pressure regulator 14 on the gas inlet conical pipe is gradually compressed, so that the propelling gas flow is temporarily generated in the heat exchange flue 5, the flue gas speed is improved, and the heat exchange effect is controlled.
The volume expanding or reducing mechanism is realized through the air pressure regulator 14, the telescopic corrugated wall 16 has the structural characteristics of compression and expansion, preferably a polytetrafluoroethylene corrugated pipe, when an output rod of the first deformation air cylinder 17 extends out, a bottom plate of the regulating cylinder is separated from the first connecting rod 18, and the telescopic corrugated wall 16 expands, so that the volume in the regulating cylinder is increased; the opposite is a decrease in volume.
Example 3
According to further optimization of the embodiment 1, a plurality of air pressure regulators 14 with variable volumes are uniformly distributed on the outer wall of the exhaust conical pipe, openings at the inner ends of the air pressure regulators are communicated with the interior of the exhaust conical pipe, and the connection positions are arranged in a sealing mode.
A plurality of air pressure regulators 14 with variable volumes are uniformly distributed on the outer wall of the air inlet conical pipe in a surrounding mode, openings at the inner ends of the air pressure regulators 14 are communicated with the interior of the air outlet conical pipe, and the connecting positions of the air pressure regulators are arranged in a sealing mode.
The air pressure regulator 14 comprises a second regulating cylinder 19, a sliding plate 20 is connected in the second regulating cylinder 19 in a sliding mode along the axial direction, a sealing air ring 21 is arranged on the outer edge of the sliding plate 20, the sealing air ring 21 is tightly pressed between the outer edge of the sliding plate 20 and the inner wall of the second regulating cylinder 19, a second deformation air cylinder 22 is connected to the middle of the sliding plate 20, openings connected with the air pressure regulator 14 are formed in the exhaust conical pipe and the air inlet conical pipe, a second connecting rod 23 is fixed to the openings, and the end portion of an output rod of the second deformation air cylinder 22 is connected to the middle of the second connecting rod 23.
An outer cover body 24 is further fixed to the bottom of the second adjusting cylinder 19, an air hole is formed in the outer cover body 24, a guide rod 25 is further arranged on the outer end face of the sliding plate 20, a guide hole is formed in the outer cover body 24, and the guide rod 25 is connected with the guide hole in a sliding fit mode.
Under an ideal state, the air pressure difference in the heat exchange flue 5 is stable, the flow rate of the flue gas is approximately constant, the flow rates of media in the heat exchange tube 9 and the attached heat exchange tube 13 are stable, and the best heat exchange effect can be achieved only by matching reasonable flue gas flow rate with certain medium flow rate. However, in use, the pressure of the flue gases entering the heat exchange stack 5 will vary, and if the pressure is too high, heat will not be exchanged and will be removed from the exhaust stack 8, and if the pressure is too low, the heat exchange efficiency will be too low, and the medium will pass through without raising the temperature to the desired level. In this application, set up a plurality of gas pressure regulators 14 on will exhaust the taper pipe and the taper pipe that admits air, 5 atmospheric pressure in heat transfer flue is too high, and when the flue gas velocity of flow was too fast, the gas pressure regulator 14 on the taper pipe that exhausts progressively compressed the volume, and the gas pressure regulator 14 on the taper pipe that admits air progressively enlarges the volume for temporarily produce in heat transfer flue 5 and offset the air current, reduce the flue gas speed, control heat exchange effect.
On the contrary, when the flow rate of the flue gas is too low, the volume of the gas pressure regulator 14 on the exhaust conical pipe is gradually enlarged, and the volume of the gas pressure regulator 14 on the gas inlet conical pipe is gradually compressed, so that the propelling gas flow is temporarily generated in the heat exchange flue 5, the flue gas speed is improved, and the heat exchange effect is controlled.
The volume expanding or reducing mechanism is realized by the air pressure regulator 14, a cavity with variable volume is formed between the sliding plate 20 and the second regulating cylinder 19, when the output rod of the second deformation air cylinder 22 extends, the sliding plate 20 is separated from the second connecting rod 23, the volume of the cavity is increased, and the volume is reduced. Sealed effect has been guaranteed to sealed air ring 21, and the coating has lubricating oil between sealed air ring 21 and the second adjusting cylinder 19, and guide bar 25 plays the guide effect for it is more stable to slide.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make various improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims (4)

1. The utility model provides a low temperature economizer of power plant which characterized in that: the flue comprises an air inlet flue, a heat exchange flue and an exhaust flue which are sequentially arranged along the flow direction of flue gas, wherein the air inlet flue and the exhaust flue are respectively communicated with the heat exchange flue through an air inlet bent pipe and an exhaust bent pipe; the heat exchange flue has a pipe diameter larger than that of the air inlet bent pipe and the air exhaust bent pipe, and is correspondingly connected with the air inlet bent pipe and the air exhaust bent pipe through an air inlet conical pipe joint and an air exhaust conical pipe joint respectively; the heat exchange tube panel is fixed on the inner wall of the heat exchange flue through a heat exchange tube panel support and consists of a plurality of bent and circuitous heat exchange tubes in rows, and two ends of the heat exchange tubes are communicated with the water inlet main pipe and the water outlet main pipe; the heat exchange tube panel is cuboid, an auxiliary heat exchange tube group is arranged in the middle of the upper end and/or the middle of the lower end of the heat exchange tube panel, the auxiliary heat exchange tube group comprises a plurality of U-shaped auxiliary heat exchange tubes, and two ends of each auxiliary heat exchange tube are communicated with adjacent heat exchange tubes;
a plurality of air pressure regulators with variable volumes are uniformly distributed on the outer wall surrounding the exhaust conical pipe, openings at the inner ends of the air pressure regulators are communicated with the inside of the exhaust conical pipe, and the connection positions of the air pressure regulators are arranged in a sealing manner;
a plurality of air pressure regulators with variable volumes are uniformly distributed on the outer wall surrounding the air inlet conical pipe, openings at the inner ends of the air pressure regulators are communicated with the interior of the air outlet conical pipe, and the connecting positions of the air pressure regulators are arranged in a sealing mode;
the air pressure regulator comprises a first regulating cylinder, the side wall of the first regulating cylinder is a telescopic corrugated wall, the middle of the bottom plate of the first regulating cylinder is connected with a first deformation cylinder, openings connected with the air pressure regulator are formed in an exhaust conical pipe and an air inlet conical pipe, a first connecting rod is fixed on each opening, and the end part of an output rod of the first deformation cylinder is connected with the middle of the first connecting rod.
2. The power plant low temperature economizer of claim 1, wherein: the auxiliary heat exchange tubes in the middle of the upper end of the heat exchange tube panel are bent upwards and are accommodated inside the exhaust conical tube joint, and the auxiliary heat exchange tubes are arranged in rows and are communicated with the heat exchange tubes arranged in rows correspondingly.
3. The power plant low-temperature economizer of claim 2, characterized in that: the auxiliary heat exchange tubes in the middle of the lower end of the heat exchange tube panel are bent downwards and are accommodated in the air inlet conical tube joint, and the auxiliary heat exchange tubes are arranged in rows and are communicated with the heat exchange tubes arranged in rows correspondingly.
4. The power plant low temperature economizer of claim 3, wherein: and H-shaped fins or metal spiral fins are welded on the outer walls of the auxiliary heat exchange tubes and the outer walls of the heat exchange tubes.
CN201711078683.2A 2017-11-06 2017-11-06 Low-temperature economizer of power plant Active CN107702084B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711078683.2A CN107702084B (en) 2017-11-06 2017-11-06 Low-temperature economizer of power plant

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Application Number Priority Date Filing Date Title
CN201711078683.2A CN107702084B (en) 2017-11-06 2017-11-06 Low-temperature economizer of power plant

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CN107702084A CN107702084A (en) 2018-02-16
CN107702084B true CN107702084B (en) 2022-12-20

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Citations (4)

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Publication number Priority date Publication date Assignee Title
CN203869018U (en) * 2014-05-28 2014-10-08 江苏釜鼎能源科技有限公司 Heat pipe type low-temperature flue gas waste heat recovery device for coal-fired power plant
CN104976607A (en) * 2015-06-17 2015-10-14 大唐(北京)能源管理有限公司 Boiler smoke-exhaustion waste heat recycling system additionally provided with heat exchange elements
CN106369585A (en) * 2016-08-28 2017-02-01 桂林市晶准测控技术有限公司 Energy-saving low-temperature economizer
CN106918239A (en) * 2015-12-24 2017-07-04 德阳市益友冶金设备制造有限公司 A kind of intermittent high temperature fume processing device

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