Ultralow-temperature economizer of secondary reheating unit
By designing the positioning mechanism and purification mechanism in the ultra-low temperature economizer, the problem of difficulty in positioning the snake-shaped heat exchange tube and the attachment of flue gas dust is solved, and more efficient equipment use and flue gas purification effect is achieved.
Patent Information
- Application Number
- CN202421215910.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-30
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-05-30
AI Technical Summary
During the use of ultra-low temperature economizer, the positioning structure of the two sides of the serpentine heat exchange tube is lacking, which makes it difficult to replace and position the serpentine heat exchange tubes of different widths, and tar or dust in the flue gas adheres to the surface of the pipe fittings, affecting the heat absorption efficiency.
An ultra-low temperature economizer including a sealing cover, a positioning mechanism and a purification mechanism is designed. The positioning mechanism adjusts and locates the diameter and width of the serpentine heat exchange tube through the side support arm, transverse guide plate and guide sleeve rod; the purification mechanism purifies the flue gas by purifying the filter element and fasteners to prevent dust from adhering to the surface of the pipe fittings.
Through the use of the positioning mechanism, flexible positioning and replacement of the serpentine heat exchange tube is achieved, and the efficiency of the equipment is improved. Through the purification treatment of the purification mechanism, the purification efficiency of the flue gas is improved, the dust emission concentration is reduced, and the heat absorption efficiency of the equipment is protected.
Smart Images
Figure CN222578222U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of economizers, in particular to an ultra-low temperature economizer for a secondary reheat unit. Background Art
[0002] The feed water below the saturation temperature flows in the economizer tube, which can effectively cool the flue gas at the outlet of the low-temperature superheater / primary low-temperature reheater / secondary low-temperature reheater. The outlet flue gas temperature of the low-pressure economizer is reduced to 85°C, which can significantly reduce the resistivity of fly ash and improve the dust collection rate of electrostatic precipitator.
[0003] During the use of the ultra-low temperature economizer, the flue gas heats the circulating liquid. However, during use, the number and width of the serpentine heat exchange tubes need to be adjusted according to the injection amount of the flue gas. However, the economizer itself lacks a positioning structure on both sides of the serpentine heat exchange tubes, which increases the difficulty of replacing and positioning serpentine heat exchange tubes of different widths. During the use of the ultra-low temperature economizer, when the flue gas is directly injected into the interior of the shell, tar or dust in the flue gas will continuously adhere to the surface of the pipe, which will affect the heat absorption efficiency of the pipe. Summary of the invention
[0004] The purpose of the utility model is to provide an ultra-low temperature economizer for a secondary reheat unit to solve the above-mentioned defects caused by the prior art.
[0005] The ultra-low temperature economizer of the secondary reheat unit comprises an economizer shell, a sealing cover plate is arranged directly above the economizer shell, a liquid injection pipe is connected through the top end of the sealing cover plate, a positioning mechanism is arranged directly below the sealing cover plate, the positioning mechanism adjusts the diameter and width of the heat exchange pipe according to the heat exchange demand to meet the positioning processing on both sides of the heat exchange pipe of different sizes, and a purification mechanism is arranged inside the economizer shell, the purification mechanism purifies the injected flue gas to prevent dust in the flue gas from directly adhering to the surface of the circulation pipe and affecting the heat absorption efficiency of the circulation pipe.
[0006] Preferably, the positioning mechanism includes a side support arm, a transverse guide plate, a serpentine heat exchange tube, a transverse guide groove and a guide sleeve rod, the top end of the side support arm is connected to the transverse guide groove, the transverse guide groove is symmetrically arranged at the bottom end of the sealing cover plate, the outer side of the side support arm is connected to the serpentine heat exchange tube, a transverse guide plate is connected between the two groups of side support arms, and a guide sleeve rod is welded to the bottom end of the sealing cover plate.
[0007] Preferably, the serpentine heat exchange tube is connected with the bottom end of the liquid injection tube through the top end penetrating through the sealing cover plate.
[0008] Preferably, the purification mechanism includes a transverse support arm, a fastener, a purification filter element, and an air intake pipe. The transverse support arm is symmetrically arranged inside the coal-saving shell, the top end of the transverse support arm is penetrated and connected with the fastener, the purification filter element is connected directly below the fastener, and the air intake pipe is penetrated and connected to one side of the purification filter element.
[0009] Preferably, the sealing cover plate is connected to the interior of the economizer shell via a guide sleeve rod welded at the bottom end.
[0010] Preferably, an air outlet pipe is connected through one side of the coal-saving shell.
[0011] Compared with the prior art, the utility model has the following advantages:
[0012] 1. During use, the lateral spacing is adjusted through the side support arms arranged on both sides, and the side support arms and the lateral guide grooves are locked through the fastening holes opened at equal intervals. According to the use requirements, the two sides of the serpentine heat exchange tube are positioned, and the other two sides of the serpentine heat exchange tube are positioned through the lateral guides arranged on both sides. During use, the back of the fin plate can also be positioned by the side support arms and the lateral guides to complete the heat absorption and heat conduction treatment.
[0013] 2. When the serpentine heat exchange tube needs to be cleaned, four sets of guide sleeve rods are used to position the bottom end of the sealing cover plate, and the serpentine heat exchange tube is driven to rise and fall vertically through the sealing cover plate, so as to facilitate the cleaning of the surface of the serpentine heat exchange tube and purify the dust in the flue gas through the purification filter element, which can effectively recover the heat of the flue gas system, improve the flue gas purification efficiency, and reduce the dust emission concentration of the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model.
[0015] Figure 2 It is a schematic diagram of the internal structure of the coal-saving shell in the utility model.
[0016] Figure 3 It is a bottom view of the structure of the sealing cover plate in the utility model.
[0017] Figure 4 It is a schematic diagram of the sealing cover plate rising in the utility model.
[0018] Figure 5 It is a schematic diagram of the side view structure of the coal-saving shell in the utility model.
[0019] in:
[0020] 1. Economizer shell; 2. Sealing cover plate; 3. Liquid injection pipe; 4. Positioning mechanism; 5. Exhaust pipe; 6. Inlet pipe; 7. Side support arm; 8. Horizontal guide vane; 9. Serpentine heat exchange tube; 10. Purification mechanism; 11. Purification filter element; 12. Horizontal support arm; 13. Fasteners; 14. Horizontal guide groove; 15. Guide sleeve rod. DETAILED DESCRIPTION
[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.
[0022] like Figures 1 to 5 As shown, the ultra-low temperature economizer of the secondary reheat unit includes an economizer shell 1, a sealing cover plate 2 is arranged directly above the economizer shell 1, a liquid injection pipe 3 is connected through the top of the sealing cover plate 2, and a positioning mechanism 4 is arranged directly below the sealing cover plate 2. The positioning mechanism 4 adjusts the diameter and width of the heat exchange pipe according to the demand of heat exchange to meet the positioning processing on both sides of the heat exchange pipes of different sizes. A purification mechanism 10 is arranged inside the economizer shell 1, and the purification mechanism 10 purifies the injected flue gas to prevent dust in the flue gas from directly adhering to the surface of the circulation pipe and affecting the heat absorption efficiency of the circulation pipe.
[0023] In this embodiment, the positioning mechanism 4 includes a side support arm 7, a transverse guide plate 8, a serpentine heat exchange tube 9, a transverse guide groove 14 and a guide sleeve 15. The top end of the side support arm 7 is connected to the transverse guide groove 14, and the transverse guide groove 14 is symmetrically arranged at the bottom end of the sealing cover plate 2. The outer side of the side support arm 7 is connected to the serpentine heat exchange tube 9, and a transverse guide plate 8 is connected between the two groups of side support arms 7. The guide sleeve 15 is welded to the bottom end of the sealing cover plate 2, and the sealing cover plate 2 is vertically lifted and lowered by the guide sleeve 15 to position the serpentine heat exchange tubes 9 of different sizes.
[0024] In this embodiment, the serpentine heat exchange tube 9 is connected with the bottom end of the injection tube 3 through the top end penetrating the sealing cover plate 2 , and the top end of the economizer shell 1 is shielded and sealed by the sealing cover plate 2 .
[0025] In this embodiment, the purification mechanism 10 includes a transverse support arm 12, a fastener 13, a purification filter element 11, and an air intake pipe 6. The transverse support arm 12 is symmetrically arranged inside the coal-saving shell 1. The top of the transverse support arm 12 is penetrated by the fastener 13. The purification filter element 11 is connected directly below the fastener 13. One side of the purification filter element 11 is penetrated by the air intake pipe 6, and the flue gas is directly discharged into the air intake pipe 6, and the flue gas dust is filtered.
[0026] In this embodiment, the sealing cover plate 2 is connected to the inside of the economizer shell 1 via a guide sleeve rod 15 welded at the bottom end, and the bottom end of the sealing cover plate 2 is positioned by the guide sleeve rod 15 to prevent the sealing cover plate 2 from being offset.
[0027] In this embodiment, an air outlet pipe 5 is connected through one side of the economizer shell 1 , and the flue gas after absorbing heat is directly discharged through the air outlet pipe 5 to avoid heat accumulation inside the economizer shell 1 .
[0028] The actual application of the ultra-low temperature economizer of this double reheat unit includes the following work contents:
[0029] Step 1: During use, the sealing cover plate 2 is pulled so that the sealing cover plate 2 is lifted vertically inside the economizer housing 1 through the guide sleeve rod 15 provided at the bottom end, so as to prevent the sealing cover plate 2 from shaking the air during the displacement process, and the size and number of the serpentine heat exchange tubes 9 are adjusted, and the transverse support arms 12 provided on both sides are pulled to slide on the outside of the transverse guide grooves 14, and the spacing of the transverse support arms 12 is adjusted, so as to position the two sides of the serpentine heat exchange tubes 9;
[0030] Step 2: The operator inserts the bolts into the positioning holes, locks the connection between the transverse support arm 12 and the sealing cover plate 2, and then makes multiple groups of transverse guide vanes 8 contact the outer sides of the transverse support arms 12 on both sides, and then locks the connection between the transverse guide vanes 8 and the transverse support arm 12 by bolts, and the fin plate can be installed on the outer side of the transverse support arm 12, so as to facilitate the synchronous heating of the transverse support arm 12, the transverse guide vanes 8 and the serpentine heat exchange tube 9 by the flue gas;
[0031] Step 3: The operator directly injects the liquid into the interior of the serpentine heat exchange tube 9 through the liquid injection pipe 3, and the serpentine heat exchange tube 9 directly discharges the liquid through the other end, and directly injects the flue gas into the interior of the economizer shell 1 through the air inlet pipe 6 set on one side, and uses the purification filter element 11 to filter the dust in the flue gas, and directly injects the flue gas into the interior of the economizer shell 1, and directly discharges the heat-absorbing flue gas through the exhaust pipe 5 set on one side through the circulating flue gas;
[0032] Step 4: During use, the purification filter element 11 is installed inside the economizer housing 1, and the two sides of the purification filter element 11 are positioned by the lateral support arms 12 arranged on both sides, and the two sides of the purification filter element 11 are locked by rotating the fasteners 13. After the flue gas is purified, it is directly injected into the interior of the economizer housing 1. At the same time, the condensed liquid in the flue gas can directly flow into the interior of the purification filter element 11, driving the dust inside the purification filter element 11 to be discharged from the interior of the economizer housing 1.
[0033] Therefore, the embodiments disclosed above are only illustrative in all aspects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.
Claims
1. The ultra-low temperature economizer of the secondary reheat unit is characterized by: The invention comprises a coal-saving shell (1), wherein a sealing cover plate (2) is arranged directly above the coal-saving shell (1), and a liquid injection pipe (3) is connected to the top end of the sealing cover plate (2), and a positioning mechanism (4) is arranged directly below the sealing cover plate (2). The positioning mechanism (4) adjusts the diameter and width of the heat exchange pipe according to the heat exchange requirements to meet the positioning requirements for the two sides of the heat exchange pipes of different sizes. A purification mechanism (10) is arranged inside the coal-saving shell (1), and the purification mechanism (10) purifies the injected flue gas to prevent dust in the flue gas from directly adhering to the surface of the circulation pipe and affecting the heat absorption efficiency of the circulation pipe.
2. The ultra-low temperature economizer of the secondary reheat unit according to claim 1, characterized in that: The positioning mechanism (4) comprises a side support arm (7), a transverse guide plate (8), a serpentine heat exchange tube (9), a transverse guide groove (14) and a guide sleeve (15); the top end of the side support arm (7) is connected to the transverse guide groove (14); the transverse guide groove (14) is symmetrically arranged at the bottom end of the sealing cover plate (2); the outer side of the side support arm (7) is connected to the serpentine heat exchange tube (9); a transverse guide plate (8) is connected between two groups of the side support arms (7); and the bottom end of the sealing cover plate (2) is welded with a guide sleeve (15).
3. The ultra-low temperature economizer of the secondary reheat unit according to claim 2, characterized in that: The serpentine heat exchange tube (9) is connected to the bottom end of the liquid injection tube (3) through the top end penetrating the sealing cover plate (2).
4. The ultra-low temperature economizer of the secondary reheat unit according to claim 1, characterized in that: The purification mechanism (10) comprises a transverse support arm (12), a fastener (13), a purification filter element (11), and an air intake pipe (6); the transverse support arm (12) is symmetrically arranged inside the economizer housing (1); the top end of the transverse support arm (12) is penetrated and connected with the fastener (13); the purification filter element (11) is connected directly below the fastener (13); and one side of the purification filter element (11) is penetrated and connected with the air intake pipe (6).
5. The ultra-low temperature economizer of the secondary reheat unit according to claim 2, characterized in that: The sealing cover plate (2) is connected to the interior of the economizer housing (1) via a guide sleeve rod (15) welded at the bottom end.
6. The ultra-low temperature economizer of the double reheat unit according to claim 1, characterized in that: An air outlet pipe (5) is connected through one side of the economizer housing (1).