Scraper device of plate heat exchanger with heat exchange plate with uneven surface

Abstract

The utility model relates to a scraper device of a plate heat exchanger with a heat exchange plate with an uneven surface. The scraper blade comprises a plurality of scraper blade units, each scraper unit is provided with a frame formed by connecting a plurality of vertical beams and a plurality of cross beams; the same side of each vertical beam is connected with a pair of curved-surface scraping plates, one curved-surface scraping plate is provided with a bending part which is bent forwards, and the other curved-surface scraping plate is provided with a bending part which is bent backwards; the curved-surface scraping plate is an elastic thin steel plate; the scraper units are arranged in parallel at equal intervals and connected with one ends of the control rods. And the other ends of the plurality of control rods are connected with a cross rod and are connected with a driving rod through the cross rod. In the using process, the heat exchange surfaces of the heat exchange plates are well attached, pressure is moderate, the heat exchange plates can be suitable for the heat exchange surfaces with different flatness, and universality is high; and the possibility of being clamped when the heat exchange plates move is avoided, and the friction resistance is small.

Description

Technical Field

[0001] The utility model relates to the technical field of online physical scale removal and scale prevention, in particular to a scraper device of a plate heat exchanger with a heat exchange plate having an uneven surface. Background Art

[0002] Leachate is a liquid produced by the decomposition of garbage in landfills or garbage treatment facilities. It contains a large amount of harmful substances such as organic matter, heavy metals, and nutrients. As an organic wastewater with complex components and extremely high concentrations of pollutants, leachate is extremely difficult to treat. Once improperly treated, it will pose a serious threat to the surface water and groundwater environment.

[0003] In response to leachate, a wastewater with complex composition and extremely high pollutant concentration, the Ministry of Ecology and Environment of China issued the "Standards for Pollution Control of Domestic Waste Landfills", proposing a concept of "full-quantity" treatment, aiming to achieve comprehensive treatment of leachate. It is explicitly prohibited to re-inject the concentrated liquid into the domestic waste landfill or discharge it into the centralized sewage treatment facility, and emphasizes the separate disposal of the concentrated liquid produced by the leachate. For leachate, the mother liquor after evaporation is concentrated, evaporated and crystallized, which is the last kilometer of the full-quantity treatment process. As the water evaporates, the concentration of solutes (such as salts and harmful substances) will gradually increase. When a certain concentration is reached, crystals may form, block the pipeline and damage the evaporation equipment. As the concentration increases, more energy is required to drive the evaporation process, resulting in increased treatment costs. The existing shell and tube evaporator is completely unable to adapt to this working process. At present, the general method is to introduce this part of the concentrated liquid into the heating kettle for reheating and evaporation. Due to the small heating area of ​​the heating kettle and the large liquid mass, the heat transfer efficiency of the equipment itself is very low. In addition, whether it is concentrated crystallization or scaling problems, it will cause serious wall sticking, which not only seriously affects the heat transfer effect, but also often jams the agitator and scraper, resulting in a large maintenance workload or equipment damage.

[0004] In recent years, corrugated plate heat exchangers and their unique performance have been widely used in various fields, but serious scaling problems will occur when used in the field of evaporation of highly concentrated viscous fluids. The heat exchange plate core of the corrugated plate heat exchanger is assembled from a number of heat exchange plates at a certain distance. There is space between the heat exchange plates, which provides space and convenient conditions for installing descaling scrapers. Since the heat exchange surface of the heat exchange plate is not a flat surface, but an uneven bulging round surface, it is difficult for ordinary scrapers to make close contact with the uneven heat exchange surface when moving, and they cannot play a role in removing dirt. Utility Model Content

[0005] The purpose of the utility model is to provide a scraper device for a plate heat exchanger with a heat exchange plate having an uneven surface, which mainly solves the problems existing in the above-mentioned prior art. It can effectively descale the plate heat exchanger with a heat exchange plate having an uneven surface. When in use, it has a good fit to the heat exchange surface of the heat exchange plate, moderate pressure, can be suitable for heat exchange surfaces of different flatnesses, and has strong versatility. There is no possibility of getting stuck when moving between the heat exchange plates, and the friction resistance is small.

[0006] The specific technical solution of the utility model is as follows:

[0007] A scraper device for a plate heat exchanger having a heat exchange plate with an uneven surface, characterized in that it comprises a plurality of scraper units;

[0008] Each scraper unit has a frame formed by connecting a plurality of vertical beams and a plurality of horizontal beams; a pair of curved scrapers are connected to the same side of each vertical beam, wherein one curved scraper has a curved portion that bends forward, and the other curved scraper has a curved portion that bends backward; the curved scrapers are elastic thin steel plates;

[0009] A plurality of scraper units are arranged in parallel and equidistantly, and are connected to one end of a plurality of control rods; the other ends of the plurality of control rods are all connected to a cross rod and are connected to the driving rod through the cross rod.

[0010] The scraper device of the plate heat exchanger with the heat exchange plate having an uneven surface is characterized in that a supporting wheel is arranged at the lower end of the vertical beam.

[0011] The scraper device of the plate heat exchanger with the heat exchange plate having an uneven surface is characterized in that a plurality of spacing grooves are arranged on the curved portion of the curved scraper, and the spacing grooves divide the curved portion into a plurality of small scrapers.

[0012] The scraper device of the plate heat exchanger with the heat exchange plate having an uneven surface is characterized in that the top end of the curved portion of the curved scraper has a shape corresponding to the heat exchange surface of the heat exchange plate with an uneven surface.

[0013] The scraper device of the plate heat exchanger with a heat exchange plate having an uneven surface is characterized in that the thickness of the curved scraper is less than 0.5 mm.

[0014] The scraper device of the plate heat exchanger with the heat exchange plate having an uneven surface is characterized in that the vertical beam and the curved scraper are welded by resistance welding, laser welding or brazing.

[0015] The scraper device of the plate heat exchanger with the heat exchange plate having an uneven surface is characterized in that the vertical beam and the horizontal beam are welded by electric welding argon arc welding process.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] 1. In actual use, both sides of each heat exchange plate are provided with scraper units in the scraper device of the utility model. Multiple scraper units can be driven simultaneously by the driving rod and the control rod. The driving rod retracts and retracts back and forth under the action of the external driving force, thereby controlling the overall scraper device to move back and forth on each heat exchange plate to perform descaling operation, which is convenient and efficient.

[0018] 2. In the utility model, a pair of curved scrapers are connected to the same side of each vertical beam, one of which has a curved portion that bends forward and the other has a curved portion that bends backward; the curved scraper is an elastic thin steel plate; therefore, a flexible scraper is formed, which fits the heat exchange surface of the heat exchange plate well, has moderate pressure, can be suitable for heat exchange surfaces of different flatness, and has strong versatility. When in use, there is no possibility of getting stuck when moving between heat exchange plates, and the friction resistance is small, and the anti-scaling and descaling effect is good, which can ensure that the heat exchanger plate surface does not scale when the plate heat exchanger evaporates highly concentrated mother liquid or very viscous fluid, and maintains efficient heat transfer effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of embodiment 1 of the utility model.

[0020] Figure 2 It is a partial cross-sectional view of Example 1 of the utility model.

[0021] Figure 3 It is a structural schematic diagram of embodiment 2 of the present utility model.

[0022] Figure 4 It is a structural schematic diagram of embodiment 3 of the present utility model.

[0023] Figure 5 It is a structural schematic diagram of embodiment 4 of the present utility model. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0025] See also Figure 1-2 The utility model discloses an embodiment 1 of a scraper device of a plate heat exchanger with a heat exchange plate having an uneven surface, which comprises a plurality of scraper units.

[0026] As shown in the figure: each scraper unit has a frame composed of a plurality of vertical beams 1 and a plurality of horizontal beams 2 (such as a metal frame composed of metal vertical beams and metal horizontal beams, which is the support body of the entire device); a pair of curved scrapers 3 are connected to the same side of each vertical beam 1, one of the curved scrapers 3 has a curved portion that bends forward, and the other curved scraper 3 has a curved portion that bends backward; the curved scrapers 3 are elastic thin steel plates;

[0027] The plurality of scraper units are arranged in parallel and equidistantly, and are connected to one end of a plurality of control rods 5 ; the other ends of the plurality of control rods 5 are connected to a cross bar and connected to the driving rod 6 through the cross bar.

[0028] In the utility model, a support wheel 4 is arranged at the lower end of the vertical beam 1, which can be used to support the scraper device and facilitate the movement of the device.

[0029] In the present invention, the thickness of the curved scraper 3 is less than 0.5 mm.

[0030] In the utility model, the vertical beam 1 and the curved scraper 3 are welded by resistance welding, laser welding or brazing process.

[0031] In the utility model, the vertical beam 1 and the horizontal beam 2 are welded by electric argon arc welding.

[0032] In actual use, both sides of each heat exchange plate have the scraper unit in the scraper device of the utility model. Multiple scraper units can be driven simultaneously by the driving rod 6 and the control rod 5. The driving rod 6 is extended and retracted back and forth under the action of the external driving force to control the overall scraper device to move back and forth on each heat exchange plate to perform descaling operation. The descaling operation is convenient and efficient. In the utility model, a pair of curved scrapers are connected to the same side of each vertical beam, one of which has a curved portion that bends forward and the other has a curved portion that bends backward; the curved scraper is an elastic thin steel plate; therefore, a flexible scraper is formed, which fits the heat exchange surface of the heat exchange plate well, has moderate pressure, can be suitable for heat exchange surfaces of different flatness, and has strong versatility. When in use, there is no possibility of getting stuck when moving between heat exchange plates, and the friction resistance is small, and the anti-scaling and descaling effect is good, which can ensure that the heat exchanger plate surface does not scale when the plate heat exchanger evaporates highly concentrated mother liquor or a fluid with very high viscosity, and maintains an efficient heat transfer effect.

[0033] See also Figure 3 , which is Embodiment 2 of the utility model. In this embodiment, a plurality of spacing grooves 31 are arranged on the curved portion of the curved scraper 3, and these spacing grooves 31 divide the curved portion into a plurality of small scrapers 32, which is more conducive to adapting to the heat exchange surface of different heat exchange plates, effectively removing scale and reducing running resistance.

[0034] See also Figure 4 , 5, which are embodiments 3 and 4 of the utility model. In this embodiment, the top of the curved portion of the curved scraper 3 has a shape corresponding to the heat exchange surface of the heat exchange plate with an uneven surface, which is more conducive to adapting to the heat exchange surface of different heat exchange plates, effectively removing scale and reducing running resistance.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A scraper device for a plate heat exchanger having a heat exchange plate with an uneven surface, characterized in that: It includes several scraper units; Each scraper unit has a frame formed by connecting a plurality of vertical beams (1) and a plurality of horizontal beams (2); a pair of curved scrapers (3) are connected to the same side of each vertical beam (1), wherein one curved scraper (3) has a curved portion that bends forward, and the other curved scraper (3) has a curved portion that bends backward; the curved scraper (3) is an elastic thin steel plate; The plurality of scraper units are arranged in parallel and equidistantly, and are connected to one end of a plurality of control rods (5); the other ends of the plurality of control rods (5) are connected to a cross rod and are connected to a driving rod (6) via the cross rod.

2. The scraper device of a plate heat exchanger with a heat exchange plate having an uneven surface according to claim 1, characterized in that: A supporting wheel (4) is provided at the lower end of the vertical beam (1).

3. The scraper device of a plate heat exchanger with a heat exchange plate having an uneven surface according to claim 1 or 2, characterized in that: A plurality of spacing grooves (31) are arranged on the curved portion of the curved scraper (3), and the spacing grooves (31) divide the curved portion into a plurality of small scrapers (32).

4. The scraper device of a plate heat exchanger with a heat exchange plate having an uneven surface according to claim 1 or 2, characterized in that: The top end of the curved portion of the curved scraper (3) has a shape corresponding to the heat exchange surface of a heat exchange plate with an uneven surface.

5. The scraper device of a plate heat exchanger with a heat exchange plate having an uneven surface according to claim 1 or 2, characterized in that: The thickness of the curved scraper (3) is less than 0.5 mm.

6. The scraper device of a plate heat exchanger with a heat exchange plate having an uneven surface according to claim 1 or 2, characterized in that: The vertical beam (1) and the curved scraper (3) are welded by resistance welding, laser welding or brazing.

7. The scraper device of a plate heat exchanger with a heat exchange plate having an uneven surface according to claim 1 or 2, characterized in that: The vertical beam (1) and the horizontal beam (2) are welded using an electric argon arc welding process.

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