Drum Cooler Drum

Abstract

The present invention discloses a drum of a slag cooler, comprising a heat-insulating layer, a shell, a heat-exchanging tube, fins, a spiral propulsion plate, a slag-raising plate, a membrane heat-exchanging tube panel, curved fins, a central tube, etc. The fins of the outer heat-exchanging tube of the drum of the slag cooler are installed in a radial direction, and a shell is added outside the existing outer heat-exchanging tube, and the outer side of the shell is covered with a heat-insulating layer; a membrane heat-exchanging tube panel composed of heat-exchanging tubes and fins is installed inside the slag cooler drum, and curved fins are installed on the heat-exchanging tube panel to increase the effective heat-exchanging area.

Description

Technical Field

[0001] The invention relates to a roller of a slag cooler. Background Art

[0002] In the current industrial production process, the power, cement and metallurgical industries will produce a lot of high-temperature ash that needs to be cooled. For example, the circulating fluidized bed boiler unit in the power industry will produce a large amount of high-temperature ash. If these ash cannot be effectively cooled, not only will the heat energy be greatly wasted, but it will also cause great safety problems to nearby people and equipment. Therefore, it is necessary to recycle the physical heat of these ash to improve energy utilization and achieve civilized production.

[0003] In order to recover the heat of ash, various types of ash cooling devices have appeared. A large number of practices have proved that drum coolers have more advantages in reliability and energy efficiency indicators. Therefore, most of the fluidized bed boiler ash cooling devices in my country are drum coolers.

[0004] With the advancement of technology, the output of the commonly used roller slag cooler is getting bigger and bigger. However, since the heat exchange characteristics between ash / cooling water are different from those between fluids, the heat exchange surface utilization efficiency of the roller of the commonly used roller slag cooler is low, and even the contact heat exchange area is less than 40% of the total heat exchange area. This makes the slag cooler larger in size and the outlet water temperature is not high. Summary of the invention

[0005] In view of the existing problems, the object of the present invention is to provide a drum of a slag cooler with a high effective heat exchange area, so as to achieve high output and high outlet water temperature.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: changing the installation direction of the fins of the current drum membrane wall of the drum slag cooler from circumferential installation to radial installation, and at the same time adding a shell layer outside the existing outer heat exchange tube, and covering the outside of the shell with an insulation layer; installing a membrane heat exchange tube panel composed of internal heat exchange tubes and fins inside the drum of the slag cooler, and installing curved fins on the heat exchange tube panel to increase the effective heat exchange area.

[0007] The device has the characteristics of simple structure, high efficiency, low cost, convenient maintenance and low power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Attached Figure 1 It is a schematic diagram of the cross section of the drum of the drum cooler.

[0009] Attached Figure 2 This is a partial enlarged view of the drum. DETAILED DESCRIPTION

[0010] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0011] 1 - Insulation layer 2 - Outer heat exchange tube 3 - Fins 4 - Shell 5 - Spiral propulsion plate 6 - Slag lifting plate 7 - Internal heat exchange tube 8 - Fins 9 - Front curved fins 10 - Back curved fins 11 - Center tube

[0012] In the attached Figure 1 In the drum cooler shown, the outer shell 4 of the drum cooler is covered with an insulation layer 1, the outer heat exchange tube 2 passes through the spiral propulsion plate 5 and is connected to the shell 4 through the fins 3, the spiral propulsion plate 5 is installed on the inner surface of the shell 4, and the slag lifting plate 6 is welded on the outer heat exchange tube 2 and is located between the spiral propulsion plates 5. A membrane heat exchange tube panel consisting of an internal heat exchange tube 7 and fins 8 is installed inside the drum cooler, and a front curved fin 9 and a rear curved fin 10 are installed at the front and rear of the heat exchange tube panel, wherein the cavity opening direction formed by the front curved fin 9, the internal heat exchange tube 7 and the fin 8 is away from the axis direction of the drum cooler, and the cavity opening direction formed by the rear curved fin 10, the internal heat exchange tube 7 and the fin 8 is toward the axis direction of the drum cooler. The center tube 11 is installed on the center line of the drum.

[0013] When the drum cooler is working, Figure 1 The rotation direction of the drum and the tube panel shown is counterclockwise, and the slag lifting plate 6 lifts part of the slag in the drum. In the process of the slag lifting plate 6 carrying the slag upward, part of the heat of the slag is released to the outer heat exchange tube 2, and the heat is taken away by the heat exchange medium in the heat exchange tube 2. After the slag reaches a certain height, the slag will be thrown out from the slag lifting plate 6 and fall on the membrane heat exchange tube panel. Part of the slag enters the cavity formed by the front curved fin 9, the internal heat exchange tube 7 and the rib 8, and the other part of the slag will slide onto another axially symmetrically installed membrane heat exchange tube panel and enter the cavity formed by the rear curved fin 10, the internal heat exchange tube 7 and the rib 8. The slag falling into the cavity transfers heat to the heat exchange medium in the membrane heat exchange tube panel. As the drum and the tube panel continue to rotate, the slag in the front and rear cavities of the tube panel is continuously filled and scattered, so that the heat of the slag is continuously transferred to the heat exchange medium in the internal heat exchange tube 7. The heat exchange medium in the outer heat exchange tube 2 and the inner heat exchange tube 7 is collected by the central tube 11. The ash that is not lifted up at the bottom of the drum is continuously mixed with the lifted up ash and is continuously pushed by the spiral propulsion plate 5, moving from the inlet to the outlet of the slag cooler drum, and the temperature gradually decreases, and finally discharged from the slag cooler.

[0014] Since the fins 3 between the outer heat exchange tube 2 and the shell 4 in the drum of the drum slag cooler are radially installed, when the slag lifting plate 6 carries the slag upward, the entire outer heat exchange tube 2 is buried in the slag, thus increasing the effective heat exchange area. Figure 1The number of heat exchange tube panels arranged mainly depends on whether it is convenient for personnel to enter for maintenance.

[0015] In order to improve the heat utilization efficiency of the ash, the drum is covered with an insulation layer 1 to prevent a large amount of heat loss and prevent scalding accidents.

[0016] The present invention is not limited to the above-mentioned best implementation mode, and anyone can obtain other various forms of products under the enlightenment of the present invention. However, no matter what changes are made in its shape or structure, all technical solutions that are the same or similar to the present invention are within its protection scope.

Claims

1. A drum of a drum slag cooler, comprising an insulation layer, a shell, heat exchange tubes, fins, a spiral propulsion plate, a slag lifting plate, a membrane heat exchange tube panel, a curved fin and a central tube, wherein the outer surface of the shell of the drum slag cooler is covered with an insulation layer, a spiral propulsion plate is installed on the inner surface of the shell, the outer heat exchange tube passes through the spiral propulsion plate and is connected to the shell through the fins, the slag lifting plate is welded on the outer heat exchange tube and is located between the spiral propulsion plates, a membrane heat exchange tube panel composed of internal heat exchange tubes and fins is installed inside the drum, curved fins are welded on the front and rear surfaces of the fins of the heat exchange tube panel, the fins, the internal heat exchange tubes and the fins form a semi-enclosed cavity, with the rotation direction as a reference, the cavity opening in front of the tube panel faces the centrifugal direction, the cavity opening behind the tube panel faces the centripetal direction, and the central tube is installed on the axis of the drum.

2. The drum of the slag cooler according to claim 1, characterized in that: The number of membrane heat exchange tube panels inside the drum is even and they are installed in an axisymmetric manner.

3. The drum of the drum slag cooler according to claim 1, characterized in that: Heat exchange fins are welded on the centripetal surface of the outer heat exchange tube.

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