JP5105294B1 - Heat transfer tube cleaning device and exhaust heat recovery heat exchanger in warm waste heat recovery system - Google Patents

Abstract

The present invention relates to a heat transfer tube in a warm wastewater heat recovery system that can perform a heat transfer tube cleaning operation more completely without interrupting exhaust heat recovery and improve energy saving efficiency with a simpler system and structure. An object of the present invention is to produce a cleaning device and an exhaust heat recovery heat exchanger.
In a cleaning device for a heat transfer tube of an exhaust heat recovery heat exchanger for recovering exhaust heat of warm waste water, a cleaning plate having a heat transfer tube insertion hole is inserted into the heat transfer tube and sandwiched between a pair of plates. And a heat transfer tube cleaning device in a warm drainage heat recovery system comprising a drive device for reciprocatingly sliding the cleaning plate in the longitudinal direction of the heat transfer tube by moving the pair of plates. Settled.
[Selection] Figure 4

Description

  The present invention relates to a heat transfer tube cleaning device in a novel warm wastewater heat recovery system that removes sludge and soot adhering to the outer surface of a heat transfer tube of a waste heat recovery heat exchanger for hot wastewater discharged from a hot spring.

  In recent years, using the heat of hot wastewater discharged from hot spring facilities and other baths to reduce the impact on the natural world due to the release of hot water from hot springs and to conserve energy by recovering heat from the hot wastewater, Equipment for helping to raise the temperature of clean water used for washing hot water, rising hot water, etc., is increasing. In such equipment, heat exchangers are used to recover the exhaust heat of the hot waste water.

  However, if the hot water discharged from the bathhouse is passed through the heat exchanger for recovering heat from the hot water, dirt, detergent and hair mixed in the hot water will adhere to the heat transfer tube and lower the heat transfer rate. Therefore, the heat recovery efficiency is deteriorated and the energy saving effect is reduced. In order to prevent this, a heat transfer pipe cleaning device is usually provided in a hot spring facility having a function of recovering heat from a hot waste water, and soot and dirt adhering to the heat transfer pipe are periodically removed.

JP 2003-130454 A Japanese Patent Laid-Open No. 2007-3078

  The heat exchanger cleaning device disclosed in Patent Document 1 is a device that injects a cleaning ball from one end of a tubular heat exchanger, moves it to multiple ends by pump water pressure, and cleans the inside of the heat transfer tube by sliding friction. The pump water pressure is required, the balls may be clogged in the heat transfer tube due to oxidation, corrosion, etc. in the heat transfer tube, and the structure is complicated and the cleaning work is not easy.

The heat exchanger cleaning device disclosed in Patent Document 2 is provided with a flow path switching device that repeatedly changes the warm drainage pressure in the heat transfer tube of the exhaust heat recovery heat exchanger and a device that blows air into the heat transfer tube. It is a device that removes sludge adhering to the heat transfer tube, but the hot wastewater sent by the pump into the adhering tube such as soot and dirt must pass through the flow path switching device twice at the inlet / outlet of the heat exchanger. In addition, although the apparatus is complicated, there is a possibility that the effect of removing wrinkles and dirt due to air bubbles and pressure fluctuations is not sufficient.

The present invention relates to a heat transfer tube cleaning device in a warm wastewater heat recovery system that can perform a heat transfer tube cleaning operation more completely without interrupting exhaust heat recovery and improve energy saving efficiency with a simpler system and structure. The purpose is to produce.

This invention 1 made | formed in order to solve the said objective WHEREIN: In the cleaning apparatus of the heat exchanger tube of the waste heat recovery heat exchanger for collect | recovering the waste heat of warm wastewater, the cleaning board which has a heat exchanger tube penetration hole in the center , sandwiched by inserted through and a pair of plate to the heat transfer tubes, wherein comprises a drive device for reciprocally sliding the cleaning plate in the longitudinal direction of the heat transfer tube by moving the pair of plate, the cleaning plate is the It is made of hard rubber or plastic that slides along the heat transfer tube, the cleaning plate is elastic, and is provided with a slit in one place, and the pair of plates consists of a vertical plate and a vertical plate. A space having a dimension larger than the thickness of the sandwiched cleaning plate is provided between the holding vertical plate and the vertical plate .
According to such a configuration, all the cleaning plates attached to all the heat transfer tubes are strongly moved simultaneously by pushing in the forward direction and then moved by pulling in the backward direction, and this reciprocating sliding is automatically and periodically performed. with the effect of ensuring the cleaning of the heat transfer tube outer surface by repeating, surely removing the results of the heat transfer tube cleaning Ri effect there that can check easily visually garbage and dirt adhering to the heat transfer tube outer surface When the cleaning plate is worn or worn, there is an effect that it can be easily replaced manually without interrupting the exhaust heat recovery.

In order to solve the above-described object, the present invention 2 is characterized in that one of the pair of plates sandwiching the cleaning plate is held in a non-tightened state.
According to such a configuration, when replacing the cleaning plate, there is an effect that the cleaning plate can be replaced only by pulling up one of the pair of plates without loosening the bolts and nuts.

This invention 3 made | formed in order to solve the said objective uses a polishing tube for the said heat exchanger tube, It is characterized by the above-mentioned.
According to such a configuration, there is an effect that wrinkles and dirt adhering to the outer surface of the heat transfer tube are reduced, and adhering wrinkles and dirt are easily removed.

This invention 4 made in order to solve the said objective is equipped with the said heat exchanger tube cleaning apparatus, the warm water tank which accumulates warm wastewater around the said heat exchanger tube, and the weir provided in the said warm water tank, There is a gap at the bottom of the weir to allow dredging of dirt and dirt heavier than the drainage, and the bottom gap of the weir provided in the hot water tank has a length for adjusting the amount of drainage outflow from the gap. An adjustment plate having a plurality of holes is provided .
According to such a configuration, among the scraped dirt and dirt, those that are heavier than the drainage flow with the drainage from the gap, and those that are lighter than the drainage overflow with the drainage over the weir and also drain the heat of the warm drainage. There is an effect that heat exchange absorbed in the water is performed without delay. Furthermore, it is possible to keep the differential pressure of the warm drainage between the inlet and outlet of the exhaust heat recovery heat exchanger low, and it is possible to perform the exhaust heat recovery without using the warm drain pump, thereby improving the energy saving efficiency. There is. Also, the adjustment plate mounting position can be changed by changing the position of the bolts and nuts that tighten the elongated holes, and the amount of drainage that flows out of the gap can be adjusted, so that the dredging and dirt that have fallen to the bottom are appropriate. There is an effect that can be drained.

According to the first aspect of the present invention, all the cleaning plates attached to all the heat transfer tubes are strongly pushed simultaneously and moved in the forward direction, and then pulled and moved in the backward direction. This reciprocating sliding is automatically and periodically performed. By repeating the above, there is an effect of ensuring the cleaning of the outer surface of the heat transfer tube, and an effect that the result of the heat transfer tube cleaning can be easily visually confirmed, so that wrinkles and dirt adhering to the outer surface of the heat transfer tube can be surely removed. There is an effect, and when the cleaning plate is worn or worn, there is an effect that it can be easily replaced manually without interrupting the exhaust heat recovery.

According to the second aspect of the present invention, when replacing the cleaning plate described above, there is an effect that the cleaning plate can be replaced only by pulling the holding plate upward without loosening the bolts and nuts.

According to the third aspect of the present invention, there is an effect that the wrinkles and dirt adhering to the outer surface of the heat transfer tube are reduced and the attached wrinkles and dirt are easily removed.

According to the fourth aspect of the present invention , among the scraped soot and dirt, those that are heavier than the drainage flow with the drainage through the gap, and those that are lighter than the drainage overflow with the drainage over the weir and the heat of the warm drainage. There is an effect that heat exchange that absorbs the water into the clean water is performed without delay. In addition, it is possible to keep the differential pressure of the warm drainage between the inlet and outlet of the exhaust heat recovery heat exchanger low, and it is possible to perform exhaust heat recovery without using the warm drain pump, which has the effect of increasing energy saving efficiency. is there. Also, the adjustment plate mounting position can be changed by changing the position of the bolts and nuts that tighten the elongated holes, and the amount of drainage that flows out of the gap can be adjusted, so that the dredging and dirt that have fallen to the bottom are appropriate. There is an effect that can be drained.

It is a flow sheet of an exhaust heat recovery system including a heat exchanger tube cleaning device. It is the schematic of an exhaust heat recovery heat exchanger. FIG. 3 is a detailed view of part A in FIG. 2. It is a perspective view which shows a heat exchanger tube cleaning apparatus. FIG. 3 is a detailed view of part B in FIG. 2. FIG. 3 is a detailed view of part C in FIG. 2.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

FIG. 1 is a flow sheet showing a configuration of an exhaust heat recovery system for hot spring drainage in which the heat transfer tube cleaning device of the present invention is incorporated. The hot spring water supplied to the bath 1 from the source is stored in the bathtub 2 and overflows, and flows out from the bath 1 as hot wastewater together with the hot water supplied from the plurality of hot water taps 3 and used. The warm waste water that flows out from the bath 1 flows into the exhaust heat recovery heat exchanger 4 through a drain groove or a pipe.

Depending on the positional relationship between the bathhouse 1 and the exhaust heat recovery heat exchanger 4, there is a case where the warm wastewater is stored in the warm drainage tank 10 and sent to the exhaust heat recovery heat exchanger 4 by the warm drainage pump 11.

FIG. 2 is a schematic view of the exhaust heat recovery heat exchanger 4.
The heat transfer tube cleaning device 7 is attached to the heat transfer tube 5 and reciprocates in the longitudinal direction of the straight tube of the heat transfer tube 5.

The heat transfer tubes are connected in a form in which a plurality of U-shaped tubes arranged in a plane are stacked in a plurality of stages, and both sides are supported by a heat transfer tube support 45. A union joint 47 is used for connection between the water inlet 43 and the water outlet 44.

The weir 6 is installed inside the heat transfer tube support 45.

    The heat transfer tube cleaning device 7 moves between the heat transfer tube support 45 on the side opposite to the weir 6.

Since the support tube 78 in the heat transfer tube cleaning device 7 needs to be attached in a direction that exactly matches the direction of movement of the connecting shaft of the drive device 12 in order to move smoothly, one of the ends of the support tube 78 is flange 49. The other side is fastened by using the adjustment support tube 48 and screwing in bolts from three directions arranged at intervals of 120 degrees in the circumferential direction.

The inside of the hot water tank 40 is partitioned by the weir 6, and the hot drainage is accumulated on the warm drainage inflow side, and the heat transfer pipe 5 is immersed therein. The warm wastewater that has flowed in is cooled by clean water flowing through the pipe wall of the heat transfer pipe 5 and overflows from the top of the weir 6 as cooled drainage.

There is a gap at the bottom of the weir 6. Of the deposits and dirt removed from the heat transfer tube 5, the heavier than the drainage flows out of the gap with the drainage, and the lighter than the drainage is the weir 6. It overflows with drainage from the top. Both flow out from the bottom of the exhaust heat recovery heat exchanger 4 as cooled waste water.

FIG. 3 is a detailed view of part A in FIG. An adjustment plate 61 is attached to the lowermost part of the weir 6 to adjust the flow rate of drainage flowing out from the gap. A plurality of elongated holes 62 are formed in the portion where the bottom of the weir and the adjustment plate 61 overlap, and the amount of outflow is adjusted by changing the vertical position where the bolts and nuts 63 are tightened together, and it falls to the bottom. It prevents soot and dirt from accumulating.

In FIG. 1, the clean water fed by the clean water pump 8 so as to pass through the heat transfer pipe 5 is
The heat of the hot drainage is absorbed through the tube wall of the heat transfer tube 5, the temperature is raised, the heat flows into the hot water heater 9, further heated to an appropriate temperature, and supplied to the hot water faucet 3 of the bath 1.

FIG. 4 is a perspective view of the heat transfer tube cleaning device. A pair of plates is constituted by the contact plate 72 and the holding plate 73, and the cleaning plate 71 is sandwiched therebetween. The abutment plate 72 includes an abutment plate 721, an abutment plate 722, and a connecting plate 723. The abutment plate 721 serves to connect the abutment plate 722, and the abutment plate 722 supports and pushes the cleaning plate 71 to move. Have a role.

The contact plate support plate 74 integrated with the contact plate 72 is placed on the support tube 77 with the slide plate 75 integrated with the contact plate support plate 74, so that the cleaning plate 71 can be prepared for mounting.

The cleaning plate 71 is attached to all the heat transfer tubes 5.

The cleaning plate 71 is a disk or hexagon plate made of plastic or hard rubber having a thickness of several millimeters with a heat transfer tube insertion hole 712 formed in the center. The heat transfer tube 5 is inserted into the heat transfer tube insertion hole 712, and the cleaning plate By sliding 71, the wrinkles and dirt adhering to the heat transfer tube 6 are scraped off.

In the case of the cleaning plate 71 provided with one slit 711, the clearance of the slit 711 is expanded by manually twisting using the elasticity of the cleaning plate material, and the heat transfer tube 5. Can be removed, and can be mounted as well.

Some cleaning plates do not have slits 711, but when these are used, a union joint is attached to one end of each heat transfer tube. Remove the union joint. This type of cleaning plate is a disc or hexagonal plate with no slit, and the diameter of the insertion hole is the same as the outer diameter of the heat transfer tube, and the diameter of the insertion hole is 0.5 mm from the outer diameter of the heat transfer tube. There are some which are thinned and provided with a plurality of short slits having a length of about 5 to 10 mm around them.

The holding plate 73 includes a holding horizontal plate 731 and a holding vertical plate 732, and the holding horizontal plate 731 has a function of connecting the holding vertical plate 732, and the holding vertical plate 732 sandwiches the cleaning plate 71 between the vertical plate 722. It has the role of supporting and pushing the cleaning plate 71 when it is pulled and moved.

FIG. 5 is a detailed view of part B of FIG. The cleaning plate 71 inserted through the heat transfer tube insertion hole 712 in the heat transfer tube 5 is illustrated as being sandwiched between the vertical plate 722 and the holding vertical plate 32.

In FIG. 4, in order to connect the horizontal plate 721 and the holding horizontal plate 731 with bolts and nuts 76,
A plurality of contact notches 771 and restraining notches 772 are provided and fastened with bolts and nuts 76, but the nuts on the lateral plate 721 side are firmly tightened, but the restraining notches 772 side has a bolt head. The holding plate 73 is simply suspended by the bolt shaft between the horizontal plate 731 and the head of the bolt. This is for simplifying the operation of pulling the holding plate 73 upward when the cleaning plate 71 is replaced.

FIG. 6 is a detailed view of part C of FIG. The driving device 12 is connected to the contact plate 72, and the cleaning start / stop time is set. As shown in FIG. 6, this connection is made by welding a rectangular connection plate 723 so as to connect the two located at the center of the vertical plate 722, but a hole is made in the center of the connection plate 723 to drive the connection. The drive shaft 121 coming out of the device 12 is fastened with a nut 122 through a threaded tip.

As the driving device, a driving device such as an air cylinder or an electric motor is used.

    The drive device is installed on the drive device support 46.

When it is assumed that soot and dirt accumulate, the cleaning device starts sliding, reciprocates several times from end to end of the cleaning range in the longitudinal direction of the heat transfer tube, stops after cleaning. This periodic sliding is automatically controlled by an instrument built into the drive.

When the central hole of the cleaning plate is worn or damaged to the extent that it cannot be used, it is manually replaced with a new cleaning plate without interrupting the exhaust heat recovery.

Waste heat recovery heat exchanger manufactured to cool and recover heat from Kamiyamada hot spring drainage in Nagano Prefecture,
The heat transfer tube cleaning device is attached to a set of 20 20ASUS304L tubes each having a straight pipe length of 1 m, in which 5 tubes are set horizontally and 4 tubes are set vertically. As the cleaning plate, a Teflon (registered trademark) sheet having a thickness of 3 mm is used. A cleaning plate is removed and a union joint is attached to each heat transfer tube. The actual moving distance is 760 mm. As the driving device, an air cylinder CDG1LN80-830J-K59W manufactured by SMC is used. As a result of operation from April 20, 2011, the effect of removing dirt and detergent wrinkles, hair and other wrinkles and dirt is sufficiently improved, and the effect of exhaust heat recovery is also improved.

It was invented to easily and reliably remove dirt from the heat transfer tubes of a commercial hot spring exhaust heat recovery heat exchanger, and to replace the cleaning plate without stopping exhaust heat recovery. However, in addition to recovering and cooling waste heat from hot effluents in bathhouses other than hot springs, other industrial hot effluents and waste heat recovery from exhaust heat recovery heat exchangers used for exhaust heat recovery and cooling from thermal waste liquids It can be used for removal.

DESCRIPTION OF SYMBOLS 1 Bathhouse 2 Bathtub 3 Hot water faucet 4 Waste heat recovery heat exchanger 40 Warm water tank 41 Warm drain inlet 42 Warm drain outlet 43 Water inlet 44 Water outlet 45 Heat transfer pipe support 46 Drive support 47 Union joint 48 Adjustment support pipe 49 Flange 5 Heat Transfer Tube 6 Weir 61 Adjustment Plate 62 Elongated Hole 63 Bolt / Nut 7 Heat Transfer Tube Cleaning Device 71 Cleaning Plate 711 Slit 712 Heat Transfer Tube Insertion Hole 72 Contact Plate 721 This Horizontal Plate 722 This Vertical Plate 723 Connection Plate 73 Control Plate 731 Control Horizontal Plate 732 Hold vertical plate 74 Push plate support plate 75 Sliding plate 76 Bolt / nut 77 Notch 771 Push notch 772 Hold notch 78 Support pipe 8 Water pump 9 Water heater 10 Warm drain tank 11 Warm drain pump 12 Drive unit 121 drive shaft 122 nut

Claims (4)

In the heat transfer tube cleaning device of the exhaust heat recovery heat exchanger for recovering the exhaust heat of the hot waste water, a cleaning plate having a heat transfer tube insertion hole in the center is inserted through the heat transfer tube and sandwiched between a pair of plates. The cleaning plate is made of hard rubber or plastic that slides along the heat transfer tube, has elasticity and is provided with a slit at one location, and the pair of plates hold down the vertical plate and the vertical plate A space having a size larger than the thickness of the sandwiched cleaning plate is provided between the holding vertical plate and the vertical plate, and the cleaning is performed by moving the pair of plates. A heat transfer tube cleaning device in a warm drainage heat recovery system, comprising a drive device for reciprocatingly sliding a plate in the longitudinal direction of the heat transfer tube. 2. The heat transfer tube cleaning device according to claim 1, wherein one of the pair of plates sandwiching the cleaning plate is held by the other plate in an untightened state. 3. The heat transfer tube cleaning device according to claim 1, wherein a polishing tube is used as the heat transfer tube. A heat transfer tube cleaning device according to any one of claims 1 to 3, and the hot water tank to accumulate the thermal discharge around the heat transfer tube comprises a weir provided in the hot water tank, the bottom of the weir The exhaust heat recovery is characterized in that there is a clearance for draining dredging and dirt heavier than the drainage, and an adjustment plate having a plurality of elongated holes for adjusting the drainage flow rate from the clearance. Heat exchanger.

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