Device for automatic cleaning of hard scale in heat exchange tubes

Abstract

The invention discloses a device for automatic cleaning of hard scale in heat exchange tubes. According to the device for automatic cleaning of the hard scale in the heat exchange tubes, a steel wire cleaning helix in each heat exchange tube is installed on an inlet fixing frame or on a fixing hole plate of an inlet pipe box after being connected with a soft tightening spring in series. The steel wire cleaning helix vibrates violently in the radial direction when the device operates, and then the hard scale and crystal salt scale can be removed violently. A rotary stop vane or a stop vane which swings and rotates back and forth which is driven by a power head or a power blade is installed in an outlet pipe box, outlet resistance is increased sharply when the stop vane skims over an outlet of each heat exchange tube, the flow rate inside each tube is decreased greatly, and the tightening spring contracts to drive the steel wire cleaning helix to retract and move by a distance which is larger than the length of the screw pitch of the steel wire cleaning helix. The uniformity of scale cleaning is effectively improved due to the reciprocating motion of the steel wire cleaning helix. The steel wire cleaning helix also serves as a convective heat transfer augmentation element inside the corresponding tube, and the heat transfer augmentation amplitude is more than one time that of a continuous rotation steel wire helix. Therefore, the device for automatic cleaning of the hard scale in the heat exchange tubes has the advantage that continuous and efficient operation of heat-transfer equipment (such as evaporators, crystallizers and condensers) can be guaranteed for a long time.

Description

technical field [0001] The patent of the present invention relates to an automatic cleaning device for hard scales in heat exchange tubes, and relates to automatic cleaning and anti-scaling of hard scales and various crystalline salt scales in heat exchange tubes and enhancement of convective heat transfer. It is suitable for cooling frozen crystallizers, heating crystallizers, inorganic salt solution evaporators, tube-and-tube water-cooled condensers with hard scale, heat conduction oil heaters, oil boilers, reboilers, and is especially suitable for vacuuming steam turbine auxiliary equipment Equipment, water-cooled condensers with hard scale. Background technique [0002] Evaporators, crystallizers, heat exchangers for geothermal utilization, hard cooling water condensers, etc., the crystallized salt scale and scale in the heat exchange tubes are relatively hard and grow fast, which has a particularly serious impact on efficiency. Although there are quite a lot of automat...

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Problems solved by technology

The self-rotating steel wire spiral cleaning technology reported in the literature (experimental research on heat transfer technology of automatic rotating helix, chemical equipment technology, 1997, No. 5 p4-8), has strong automatic cleaning ability and good convective heat transfer enhancement effect , and the structure is simple, the resistance is low, and the overall performance is relatively ideal, but there are serious defects in the inner wall of the wear tube, and the cleaning uniformity is poor and the residual dirt is more

The patented self-rotating plastic-coated steel wire spiral cleaning technology (a plastic spiral device for cleaning dirt with enhanced heat transfer fluid power, ZL03124542.0, 2008.3.26.) solves the important problem of the steel wire spiral wearing the inner wall of the pipe, but loses valuable Hard dirt cleaning ability

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