Low-temperature plate type economizer convenient to clean

Abstract

The utility model discloses a low-temperature plate-type economizer convenient to clean, which belongs to the technical field of boiler flue gas recovery equipment and comprises a shell, a plurality of parallelly arranged cooling plates are fixedly connected in the shell, flue gas flow channels are formed among the cooling plates, scrapers are arranged at the tops of the flue gas flow channels, and two sides of each scraper abut against the outer surfaces of the cooling plates. One end of each cross rod is in threaded connection with a screw rod, and the other end of each cross rod is in sliding connection with a guide rod; mounting grooves corresponding to the guide rods and the screws are formed in the inner walls of the two sides of the end of the shell, the screws are rotationally connected into the corresponding mounting grooves, the top ends of the screws penetrate through the shell to be in transmission connection with motors, the guide rods are fixedly connected into the corresponding mounting grooves, and the cross rods penetrate through the mounting grooves to be connected with the guide rods and the screws. Dust and dirt on the two side walls of the cooling plate can be scraped off by the scraping plate moving up and down, the cleaning effect is achieved, the dust and dirt are prevented from influencing heat transfer, increasing resistance or corroding the cooling plate, and therefore the service life of the economizer is prolonged, and efficient operation of the economizer is maintained.

Description

Technical Field

[0001] The utility model belongs to the technical field of boiler fume recovery equipment, and in particular relates to a low-temperature plate-type economizer which is easy to clean. Background Art

[0002] Excessively high flue gas temperature of the boiler will affect the boiler efficiency and the cycle efficiency of the power plant, and increase the amount of coal used. In order to solve the problem of excessively high flue gas temperature and waste of heat energy, many power plants install economizers in the flue to recover the temperature of the flue gas. Currently, power plant boilers often use plate economizers, which achieve heat energy transfer by exchanging heat between two fluids (usually flue gas and boiler inlet water during the combustion process) in a plate heat exchanger. The flue gas is cooled in the plate economizer, and the boiler inlet water is heated, thereby reducing the flue gas temperature of the coal-fired boiler and improving the thermal efficiency of the boiler.

[0003] However, since the low-temperature plate economizer is installed under flue gas conditions, the flue gas contains a large amount of dust and various solid particles. After the flue gas side of the plate economizer has been running for a period of time, dust and scaling will accumulate on the plate surface, affecting heat transfer, increasing resistance, and even causing under-scale corrosion due to scaling, affecting the equipment service life and efficient operation of the economizer.

[0004] Therefore, a low-temperature plate economizer which is easy to clean is proposed. Utility Model Content

[0005] In order to solve the above technical problems, the utility model proposes a low-temperature plate economizer which is easy to clean.

[0006] To achieve the above-mentioned purpose, the utility model provides a low-temperature plate economizer which is easy to clean, comprising: an outer shell, a plurality of cooling plates arranged in parallel are fixedly connected in the outer shell, a flue gas flow duct is formed between the cooling plates, a scraper is arranged on the top of the flue gas flow duct, both sides of the scraper are abutted against the outer surface of the cooling plate, the front and rear ends of the scraper are respectively fixed with cross bars, one end of the cross bar is threadedly connected with a screw, and the other end of the cross bar is slidably connected with a guide rod; mounting grooves are opened on the inner walls on both sides of the end of the outer shell corresponding to the guide rod and the screw, the screw is rotatably connected to the corresponding mounting groove, the top end of the screw passes through the outer shell and is transmission-connected to a motor, the guide rod is fixed in the corresponding mounting groove, and the cross bar passes through the mounting groove to be connected with the guide rod and the screw.

[0007] Preferably, the scraper includes a connecting rod and four scrapers, the four scrapers are circumferentially fixed to the side wall of the connecting rod, the four scrapers are respectively located at the upper left, lower left, upper right and lower right positions of the connecting rod, the ends of the four scrapers away from the connecting rod are all in contact with the outer wall of the cooling plate on the corresponding side, and are inclined relative to the cooling plate; the two ends of the connecting rod are respectively fixed to the corresponding side walls of the cross bar.

[0008] Preferably, a flexible protective sleeve is fixedly connected to one end of the scraper away from the connecting rod, and the flexible protective sleeve abuts against the outer wall of the cooling plate.

[0009] Preferably, a sliding collar and an internal threaded collar are respectively fixedly connected to both ends of the cross bar, the sliding collar is sleeved on the guide rod, and the internal threaded collar is threadedly connected to the screw rod.

[0010] Preferably, a water flow channel is provided inside the cooling plate, one end of the water flow channel is connected to a water inlet branch pipe, and the other end is connected to a water outlet branch pipe, several of the water inlet branch pipes are connected to a water inlet main pipe, and several of the water outlet branch pipes are connected to a water outlet main pipe.

[0011] Preferably, a cavity is provided inside the cooling plate, and a plurality of guide plates are staggered and fixedly connected inside the cavity of the cooling plate, and the guide plates divide the cavity into S-shaped water flow channels.

[0012] Preferably, a plurality of columnar protrusions are provided on the outer wall of the cooling plate, and the scraper is provided with grooves corresponding to the columnar protrusions.

[0013] Preferably, flange plates are fixedly connected to both ends of the shell, and a plurality of connecting holes are formed on the flange plates.

[0014] Compared with the prior art, the utility model has the following advantages and technical effects:

[0015] Dust and scale are easily accumulated on the outer walls of the cooling plates on both sides of the flue gas flow duct. After the dust and scale are accumulated, the motor is started. The motor is a forward and reverse motor. The motor drives the screw to rotate. One end of the cross bar is threadedly connected to the screw, and the other end is slidably connected to the guide rod. Therefore, when the screw rotates, the cross bar moves up and down along the direction of the screw and the guide rod, thereby making the scraper fixed to it move up and down, so that the scraper can scrape off the dust and dirt on the two side walls of the cooling plate. The dust and dirt that are not adhered can float out of the economizer with the flue gas, achieving a cleaning effect, avoiding dust and dirt affecting heat transfer, increasing resistance, and even corroding the cooling plate, thereby increasing the equipment service life of the economizer and maintaining its efficient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the structure of the low-temperature plate economizer that is easy to clean according to the utility model;

[0018] Figure 2 It is a side view of the low-temperature plate economizer which is easy to clean according to the utility model;

[0019] Figure 3 for Figure 2 Sectional view of AA in the middle;

[0020] Figure 4 This is a schematic diagram of the internal structure of the low-temperature plate economizer that is easy to clean according to the utility model;

[0021] Figure 5 This is a schematic diagram of the internal structure of the cooling plate of the utility model;

[0022] Figure 6 This is a schematic diagram of the scraper structure of the utility model.

[0023] In the figure: 1. shell; 2. cooling plate; 3. flue gas flow channel; 4. scraper; 5. cross bar; 6. screw; 7. guide rod; 8. mounting groove; 9. motor; 10. sliding collar; 11. internal thread collar; 12. water flow channel; 13. water inlet branch pipe; 14. water outlet branch pipe; 15. water inlet main pipe; 16. water outlet main pipe; 17. guide plate; 18. columnar protrusion; 19. flange plate; 20. connecting hole; 401. connecting rod; 402. scraper; 403. flexible protective cover; 404. groove. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Reference Figures 1 to 6 As shown, the present embodiment provides a low-temperature plate economizer which is easy to clean, comprising: an outer shell 1, in which a plurality of cooling plates 2 arranged in parallel are fixedly connected, a flue gas flow duct 3 is formed between the cooling plates 2, a scraper 4 is arranged on the top of the flue gas flow duct 3, and both sides of the scraper 4 abut against the outer surfaces of the cooling plates 2, and the front and rear ends of the scraper 4 are respectively fixed with cross bars 5, one end of the cross bar 5 is threadedly connected with a screw rod 6, and the other end of the cross bar 5 is slidably connected with a guide rod 7; mounting grooves 8 are provided on the inner walls on both sides of the end of the outer shell 1 corresponding to the guide rod 7 and the screw 6, the screw 6 is rotatably connected in the corresponding mounting groove 8, the top end of the screw 6 passes through the outer shell 1 and is transmission-connected with a motor 9, the guide rod 7 is fixed in the corresponding mounting groove 8, and the cross bar 5 passes through the mounting groove 8 to be connected with the guide rod 7 and the screw 6.

[0027] Dust and scale are easily accumulated on the outer walls of the cooling plates 2 on both sides of the flue gas flow duct 3. After the dust and scale are accumulated, the motor 9 is started. The motor 9 is a forward and reverse motor 9. The motor 9 drives the screw 6 to rotate. One end of the cross bar 5 is threadedly connected to the screw 6, and the other end is slidably connected to the guide rod 7. Therefore, when the screw 6 rotates, the cross bar 5 moves up and down along the direction of the screw 6 and the guide rod 7, and then the scraper 4 fixed thereto moves up and down, so that the scraper 4 scrapes off the dust and dirt on the two side walls of the cooling plate 2. The dust and dirt that are not adhered can float out of the economizer with the flue gas, thereby achieving a cleaning effect, avoiding dust and dirt from affecting heat transfer, increasing resistance, and even corroding the cooling plate 2, thereby increasing the equipment service life of the economizer and maintaining its efficient operation.

[0028] A further optimized solution is that the scraper 4 includes a connecting rod 401 and four scrapers 402. The four scrapers 402 are circumferentially fixed to the side wall of the connecting rod 401. The four scrapers 402 are respectively located at the upper left, lower left, upper right and lower right positions of the connecting rod 401. One end of the four scrapers 402 away from the connecting rod 401 is in contact with the outer wall of the cooling plate 2 on the corresponding side and is inclined relative to the cooling plate 2; the two ends of the connecting rod 401 are respectively fixed to the side walls of the corresponding cross bar 5.

[0029] The two scrapers 402 on the upper left and right clean the outer walls of the cooling plates 2 on both sides from bottom to top when the cross bar 5 drives the connecting rod 401 upward. The two scrapers 402 on the lower left and right clean the outer walls of the cooling plates 2 on both sides from top to bottom when the cross bar 5 drives the connecting rod 401 downward. This allows the scrapers 4 to clean the inner walls of the cooling plates 2 regardless of whether they are moving upward or downward.

[0030] According to a further optimized solution, a flexible protective sleeve 403 is fixedly connected to one end of the scraper 402 away from the connecting rod 401 , and the flexible protective sleeve 403 abuts against the outer wall of the cooling plate 2 .

[0031] The flexible protective cover 403 is preferably a silicone protective cover, which can prevent the end of the scraper 402 from scratching the inner wall of the cooling plate 2.

[0032] According to a further optimized solution, a sliding collar 10 and an internally threaded collar 11 are respectively fixedly connected to both ends of the crossbar 5 . The sliding collar 10 is sleeved on the guide rod 7 , and the internally threaded collar 11 is threadedly connected to the screw rod 6 .

[0033] The cross bar 5 is slidably connected to the guide rod 7 via a sliding collar 10 , and the cross bar 5 is threadedly connected to the screw rod 6 via an internal thread collar 11 .

[0034] To further optimize the solution, a water flow channel 12 is arranged inside the cooling plate 2, one end of the water flow channel 12 is connected to a water inlet branch pipe 13, and the other end is connected to a water outlet branch pipe 14, several water inlet branch pipes 13 are connected to a water inlet main pipe 15, and several water outlet branch pipes 14 are connected to a water outlet main pipe 16.

[0035] The boiler inlet water enters the cooling plate 2 through the water inlet main pipe 15, is branched to the water inlet branch pipe 13, and then enters the water flow channel 12 from the water inlet branch pipe 13, exchanges heat with the high-temperature flue gas in the water flow channel 12, so that the high-temperature flue gas is cooled, the boiler inlet water temperature is heated and increased, and the heated water is converged to the water outlet main pipe 16 through the water outlet branch pipe 14 to flow out for utilization, thereby improving the thermal efficiency of the boiler.

[0036] Furthermore, the direction of the flue gas flow is opposite to that of the water flow, and the heat exchange efficiency is high.

[0037] According to a further optimized solution, a cavity is provided inside the cooling plate 2 , and a plurality of guide plates 17 are staggered and fixedly connected inside the cavity of the cooling plate 2 . The guide plates 17 divide the cavity into an S-shaped water flow channel 12 .

[0038] The guide plate 17 divides the cavity in the cooling plate 2 into an S-shaped water flow channel 12, which slows down the speed of water flowing through the cavity and facilitates heat exchange between the water flow and the flue gas.

[0039] According to a further optimized solution, a plurality of columnar protrusions 18 are provided on the outer wall of the cooling plate 2 , and the scraper 402 is provided with grooves 404 corresponding to the columnar protrusions 18 .

[0040] The columnar protrusion 18 can increase the contact area between the flue gas and the cooling plate 2, which is beneficial to the heat exchange between the flue gas and the boiler water inlet in the cooling plate 2. The scraper 402 is correspondingly provided with a groove 404, and the outer end of the scraper 402 is still in contact with the cooling plate 2, which does not affect the cleaning of the scraper 402 and the outer wall of the cooling plate 2.

[0041] According to a further optimized solution, flange plates 19 are fixedly connected to both ends of the housing 1 , and a plurality of connecting holes 20 are formed on the flange plates 19 .

[0042] The flange plate 19 facilitates the connection between the economizer and the flue, and bolts can be arranged in the connection holes 20 to connect with the flue.

[0043] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0044] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A low temperature plate economizer that is easy to clean, characterized in that: include: A shell (1), wherein a plurality of cooling plates (2) arranged in parallel are fixedly connected inside the shell (1), a flue gas flow passage (3) is formed between the cooling plates (2), a scraper (4) is arranged on the top of the flue gas flow passage (3), both sides of the scraper (4) are in contact with the outer surface of the cooling plate (2), the front and rear ends of the scraper (4) are respectively fixedly connected with a cross bar (5), one end of the cross bar (5) is threadedly connected with a screw rod (6), and the other end of the cross bar (5) is slidably connected with a guide rod ( 7); mounting grooves (8) are provided on the inner walls on both sides of the end of the housing (1) corresponding to the guide rod (7) and the screw rod (6); the screw rod (6) is rotatably connected in the corresponding mounting groove (8); the top end of the screw rod (6) passes through the housing (1) and is transmission-connected to a motor (9); the guide rod (7) is fixed in the corresponding mounting groove (8); the cross bar (5) passes through the mounting groove (8) and is connected to the guide rod (7) and the screw rod (6).

2. The low-temperature plate economizer that is easy to clean according to claim 1 is characterized in that: The scraper (4) comprises a connecting rod (401) and four scrapers (402); the four scrapers (402) are circumferentially fixed to the side wall of the connecting rod (401); the four scrapers (402) are respectively located at the upper left, lower left, upper right and lower right positions of the connecting rod (401); the ends of the four scrapers (402) away from the connecting rod (401) are all in contact with the outer wall of the cooling plate (2) on the corresponding side and are arranged obliquely relative to the cooling plate (2); the two ends of the connecting rod (401) are respectively fixed to the corresponding side walls of the cross bar (5).

3. The low-temperature plate economizer that is easy to clean according to claim 2 is characterized in that: A flexible protective sleeve (403) is fixedly connected to one end of the scraper (402) away from the connecting rod (401), and the flexible protective sleeve (403) abuts against the outer wall of the cooling plate (2).

4. The low-temperature plate economizer that is easy to clean according to claim 1 is characterized in that: The two ends of the crossbar (5) are respectively fixed with a sliding collar (10) and an internal thread collar (11); the sliding collar (10) is sleeved on the guide rod (7); and the internal thread collar (11) is threadedly connected to the screw rod (6).

5. The low-temperature plate economizer that is easy to clean according to claim 1 is characterized in that: A water flow channel (12) is provided inside the cooling plate (2); one end of the water flow channel (12) is connected to a water inlet branch pipe (13), and the other end is connected to a water outlet branch pipe (14); a plurality of the water inlet branch pipes (13) are connected to a water inlet main pipe (15), and a plurality of the water outlet branch pipes (14) are connected to a water outlet main pipe (16).

6. The easy-to-clean low-temperature plate economizer according to claim 1, characterized in that: A cavity is provided inside the cooling plate (2), and a plurality of guide plates (17) are staggered and fixedly connected inside the cavity inside the cooling plate (2), and the guide plates (17) divide the cavity into S-shaped water flow channels (12).

7. The easy-to-clean low-temperature plate economizer according to claim 2, characterized in that: A plurality of columnar protrusions (18) are provided on the outer wall of the cooling plate (2), and the scraper (402) is provided with grooves (404) corresponding to the columnar protrusions (18).

8. The easy-to-clean low-temperature plate economizer according to claim 1, characterized in that: Flange plates (19) are fixedly connected to both ends of the housing (1), and a plurality of connection holes (20) are provided on the flange plates (19).

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