KR950014045B1 - Element basket assembly for heat exchanger - Google Patents

Abstract

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Description

[Name of invention]

Element basket assembly for heat exchanger

[Brief Description of Drawings]

1 is a perspective view of a rotary regeneration heat exchanger,

2 is a plan view of a rotary heat exchanger taken along line 2-2 of FIG. 1,

3 is a perspective view of an element basket assembly designed according to the present invention,

4 is a plan view from above of the third Doy element basket assembly,

5 is a cross-sectional side view of the element basket assembly taken along line 5-5 of FIG. 4,

6 is a cross-sectional view of the left end of the element basket assembly of FIG.

7 is a cross-sectional view of the right end of the element basket assembly of FIG.

Detailed description of the invention

[Background of invention]

The present invention relates to a basket of heat transfer elements, and more particularly, to an assembly of heat absorbing plates in a basket for heat exchangers in which heat is transferred by plates from a high temperature heat exchange fluid to a low temperature heat exchange fluid. The present invention is particularly applicable to a heat transfer device of a rotary regeneration type in which a heat transfer element plate supported on the basket is heated in contact with a hot gas heat exchange fluid, after which the heat transfer element provides the heat and contacts the cool gas heat exchange fluid. The element basket of the present invention is best for use at the hot end of a rotary regenerative heat exchanger.

One type of heat exchanger device commonly used for gas to gas heat exchange and gas to air heat exchange on steam generators in the processing industry is a known rotary regenerative heat exchanger. The rotary regenerative heat exchanger has a cylindrical rotor that is divided into sectoral partitions that place a mass of heat transfer elements that are exposed to the vapor of the heating gas when the rotor is rotated and that the rotor is rotated with respect to the vapor of the cooling air or other gas fluid to be heated. The heat absorption mass includes a plurality of heat transfer element basket assemblies mounted to the sectoral partition. Each heat transfer element basket assembly assembles a plurality of heat transfer plates in which heat absorbed from the heat gas by the heat transfer plates is transferred to the cooling gas when exposed to the heat of gas absorption heat and exposed to cooling air or other gas fluid to be heated.

The element basket comprises a framed housing having a plurality of sheet-shaped heat transfer plates described in the text. The element basket housing is provided by combined side straps that interconnect end members along their sides as shown in US Pat. Nos. 3,314, 472, 4, 561, 492 and 4, 606, 400. And a frame formed of a pair of spaced apart plate end members held together.

The plurality of heat transfer plates are stacked in close proximity within the basket housing to provide a plurality of passages between adjacent plates through which the heat exchange fluid passes. Side straps interconnecting the spaced end members extend along opposite sides of the stacked array of heat exchange elements. On each side of the heat exchange element there is a first side strap extending between the upper regions of the spaced apart end members and a second side strap extending parallel between the lower regions of the spaced apart end member and parallel to the first side straps. The side straps are flanged inwardly along a longitudinal edge placed at the edge of the basket assembly providing a retaining surface that protects the heat transfer plate from falling out of the open end of the element basket as described in US Pat. No. 3,314,472. .

The element basket has in the past consisted of a box-like housing as shown in US Pat. No. 3,379,240. As described herein, the element basket is formed of a rigid sheet folded into a U-shaped member having a base end and two outwardly extending branch legs. The rigid precision end plates are welded between the outward end portions of the U-shaped member legs after the heat exchange element sheet is laminated in the housing defined by the U-shaped members. An elastic flexure pressing member is disposed between the laminated element sheet and the base end of the U-shaped member imposed against the laminated element such that the pressing force is applied to the laminated element to hold the element sheet in an array tightly packed against the end plate welded between the legs of the U-shaped member. do.

The element basket is a frame housing or a box housing, and a plurality of retaining bars are welded between the end members across their upper and lower ends to further help keep the heat transfer element plate falling out of the open end of the element basket.

The retainer bar is provided such that the heat transfer plate lies across the top and bottom edges, as shown in US Pat. No. 4,561,492. In order to provide a short basket for a given plate height, the retaining bar is placed in a recess cut at the upper and lower edges of the heat transfer plate as described in US Pat. No. 4,606,400.

In addition, the retaining bar assists in the handling of the assembled element basket and in particular serves as a structural sub-support for the lifting means to assist in the removal and installation of the element basket from the heat exchanger.

The lift means are a pair of spaced apart holes formed in a centrally located retaining bar as described in US Pat. No. 4,552,204, or centered as described in US Pat. No. 4,557,318. And a pair of spaced apart pins passing through the retained bar.

When the lift means comprise a pair of holes in U. S. Patent No. 4, 552, 204 described above, the element basket is lifted by a pair of clevis means arranged to span the center retaining bar for each lift hole. Each clevis is connected to the retaining bar by pins passing through each side of the clevis and the ascending holes that span the bar. The lift means are raised against a pair of lift lugs that simply grip pins extending through the bars in U. S. Patent No. 4, 557, 318 described above.

The prior art element baskets are well formed for many years. However, the boxed element basket is limited in use due to its weight on the cooling end of the heat exchanger only when the basket at the cooling end is about one foot deep. Because of the rigid wall structure of the boxed element basket, the weight and material cost of deeper boxed baskets is expensive. While longer than similarly sized boxed baskets, prior art framed baskets are more labor intensive because of the number and number of independent members welded together to form a framed housing. Alternatively, torsion of the via-shaped member occurs during welding of the frame, which is difficult to limit the holding characteristics.

It is an object of the present invention to provide an improved element basket assembly which is lighter than small sized prior art box baskets while the element basket is less susceptible to frame shape or torsion and is less labor intensive than prior art framed baskets. To provide.

[Summary of invention]

In order to achieve the above and other objects which are clear from the description of the present text, the element basket of the present invention includes a plurality of heat transfer element plates arranged in parallel in a stacked array to form a plurality of flow passages, and a heat transfer element for supporting the element plate. And a basket frame surrounding the stacked array of plates. The basket frame is formed of a drip-shaped member having a base end portion and a pair of spaced gaps extending outwardly from its base end in the branch member and extending vertically between the corners of the base end portion of the vertically spaced up and down cell member. Each upper and lower cell member interconnected to its base end portion by a pair of spaced-angle bars and interconnected to the outward end of its leg by an end cover plate to form a frame with respect to the stacked array of heat transfer element plates. . Holding means connected to the frame is provided along the top and bottom surfaces of the stacked array of heat transfer element plates for holding the heat transfer plate in the basket frame.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIG. 1, there is shown a regenerative heat exchanger device 2 in which the heat transfer element basket solvibody of the present invention is utilized. The rotary regenerative heat exchanger 2 comprises a housing 10 which encloses the rotor 12 in which the heat transfer element basket assembly 30 of the present invention is supported. The rotor 12 includes a cylindrical cell 14 connected to the rotor post 16 by a radially extending diaphragm 15. Heating fluid enters housing 10 through conduit 18, while fluid to be heated enters housing 10 from its opposite end via conduit 22.

The rotor 12 is rotated about its axis by a motor connected to the rotor post 16 via a suitable reduction gearing not shown in the text. When the rotor 12 is rotated, or in a sectoral partition formed by a radially extending diaphragm 15, referred to as a plate and supported in the element basket assembly 30, the heat transfer element 32 disposed in the rotor is therefrom. The heat is first moved in contact with the heating fluid entering the housing through the heat absorbing conduit 18 and then in contact with the fluid to enter and heat the housing through the conduit 22. As the heating fluid passes over the heat transfer element plate, the heat transfer element plate absorbs heat therefrom. When the fluid to be heated continuously passes over the heat transfer element plate, the fluid absorbs heat from the heat transfer element plate that is picked up when the plate is in contact with the heating fluid.

Rotary regenerative heat exchangers often preheat the air that the heat absorbing element provides to transfer heat from the hot fuel gas generated in the fossil fuel ignition furnace to the circulating air to be supplied to the furnace as a means of preheating the combustion air and increasing the overall combustion efficiency. Take advantage. Fuel gas leaving the furnace is loaded with particulates generated during combustion settling. These particulates tend to be placed on the heat transfer plate at the cooling end of the heat exchanger where any condensation of any moisture in the gas occurs. In order to provide periodic cleanliness of the heat transfer elements disposed within the element basket assembly, the heat exchanger is disposed in the passageway for the fluid to be heated adjacent to the cooling end of the rotor 12 and opposite the open end of the heat transfer element basket assembly. The nozzle 20 is provided. The cleaning nozzle 20 directs the high pressure cleaning fluid, ie air, water or air, through the slowly rotating plate while the nozzle is being cleaned across the end face of the rotor. The high pressure fluid passing through the heat transfer element plate causes a vibrating plate to loosen the loose fly ash and other particles are disposed of the cleaner therein. Loose particles then enter high pressure steam and are transported out of the rotor.

The heat exchange material conveyed to the rotor 12 has a metal heat transfer element plate, called a sheet, formed in corrugations or waves so that when the plates are placed in a stacked array in adjacent relationship, a series of internal passages are provided for the heating and cooling fluids to flow therethrough. do. The plates are assembled into a quadrilateral array of plates with independent plates that are kept stacked so as they are treated as an integral assembly for placement in the sectoral bulkhead in the rotor of the heat exchanger.

As shown in FIG. 3, the element basket assembly 30 is a stack of plates with a plurality of flow passages therebetween to provide heat flow passages through which the heat exchange fluid passes through the heat exchange relationship with the plates 32. A plurality of heat transfer element plates 32 are arranged side by side in a spatial relationship providing an array. The plate 32 is a thin metal sheet that is rolled or stamped into the required shape. However, the present invention is not limited only to the use of the metal sheet. The plate 32 is not limited thereto and is in the shape of various faces, such as flat or corrugated or wavy surfaces, or combinations thereof having flat plates alternatively laminated between corrugated or corrugated plates.

In the element basket assembly 30 of the present invention, regardless of the plate shape and material configuration, the laminated array of the heat transfer element plates 32 is provided with a gate-like member 42a, which serves as a means for holding element waves inside the four-side housing. Its base end portion by means of a vertically extending angular bar 35 mutually connected to an end of its outwardly extending leg by a cover plate 38 to form a four side housing closed at its top and bottom by 42b). It is accommodated in the basket frame formed of the lower drip-cell member 44 and the upper drip-cell member 34 interconnected to the corner of the.

Referring to FIGS. 4-7, the framed structure of the element basket assembly 30 of the present invention is shown in various concepts with the element plate 32 not shown to improve the concept of the framed structure. And the upper and lower cell members 34 and 44 are formed of drip-shaped members having base end portions 342 and 442 and a pair of spaced legs 344 and 444 extending outwardly from their base end portions in a branching manner. Flanked members. As best shown in FIGS. 4-6, the top and bottom cell members 34, 44 are disposed at one corner and the base end portion of the top and bottom cell members 34, 44 interconnecting the spaced cell members. It is interconnected to its base end portion by brace means 35 which best comprises a pair of vertically extending angle bars disposed at the other corners of 342 and 442.

To close the four-side basket housing, the end cover member 36 extends between its lower end and the outwardly extending leg 344 of the constant cell member 34 between the end portions of the outward end leg 444 of the lower cell member 44. Between the upper end portions thereof. Although the end cover member 36 includes a solid plate member, it is preferable to form the end cover member 36 as a framed member in order to reduce the overall weight of the element basket. Thus, the end cover portion 36 is horizontally interconnected by vertically extending corner angle bars 56, 58 welded thereto to form a framed member having an opening center portion, as best shown in FIG. 7. The upper and lower flank members 52 and 54 spaced apart are best formed.

In order to retain the stacked array of heat transfer elements 32 inside the four-side housing formed by the interconnected upper and lower cell members 34 and 44 and the end cover 36, the grate member 42a is formed by a heat transfer element plate ( 32 is mounted between the end cover member 36 and the upper cell member 34 so as to extend across the top surface of the stacked array of 32, and the grate-shaped member 42b is a stacked array of heat transfer element plates 32. It is mounted between the end cover member 36 and the lower cell member 44 to extend across the lower surface of the. The grate member 42b forms a floor support structure in which a stacked array of heat transfer elements 32 lies within the basket housing, while the grate member 42a protects the element that falls out of the basket housing during shipping and handling. Shape the ceiling structure on the housing. The grate members 42a and 42b pass through the flow passages between the adjacent element plates 32 so as to maintain a large opening flow area for the flow of gas and heating gas to be heated into and out of the basket. Is formed. The lifting means as described above and described in U.S. Pat.Nos. 4,552,204 and 4,557,318 are retaining bars that form the upper grate member 42a to assist in the removal, installation and handling of the element basket solbite from the heat exchanger. Provide 48.

The assembly of the element basket assembly 30 of the present invention is less labor intensive than the assembly of a conventional framed basket. The preformed drip-shaped upper and lower cell members 34 and 44 for manufacturing the element basket assembly 30 of the present invention include spaced apart upper and lower cell members 34 and 44 that form a three-sided housing assembly. , 442 are interconnected in a spaced apart relationship by angle bars 35 welded therebetween to extend in a vertical direction. As shown in Figure 6, the four parts of the bond are needed to form the housing assembly. The height or depth of the element basket is easily varied from application to application without a significant increase in the weight of the basket by a simple selection angle bar 35 of the required length that provides the overall required basket depth. The upper and lower holding members 42a and 42b are then welded between the base end and the outwardly extending legs of the upper and lower cell members 34 and 44, which easily form a housing for receiving the heat transfer element.

The partially assembled basket frame is fixed with the base ends of the upper and lower cell members 34 and 44 like its base, and the heat transfer element plates 32 are stacked in parallel to fill a basket having the required number of heat transfer element plates. . For heat transfer element plates 32 arranged in a stacked array in a partially assembled basket frame, an end cover member 36 for forming two horizontally extending members and two vertically extending members as described above is provided as a seventh. As shown in the figure, a four-part joint is welded between the outward ends of the legs 344 and 444 of the upper and lower cell members 34 and 44.

While the heat transfer element basket assembly preferably illustrates a rotating regenerated heat exchanger in which the heat absorbing material is alternately rotated between the heating fluid and the fluid to be heated, the heat transfer element assembly of the present invention is a multiplicity of regeneration or recovery forms. The use of other known heat exchangers is evident by those skilled in the art. Alternatively, the various element shapes mentioned in the text are easily incorporated into the heat transfer basket elements of the present invention by those skilled in the art. Accordingly, the present invention is capable of covering the modifications described in the text as well as all other changes that fall within the spirit and scope of the invention as defined by the appended claims.

Claims (4)

A rotary regenerative heat exchanger (2) comprising a plurality of heat transfer element plates (32) arranged in parallel in a stacked array to form a plurality of flow passages, and a basket frame surrounding the stacked array of heat transfer element plates (32) in a supporting relationship. In the element basket assembly (30), there is a pair of elongated flanked members formed out of drip members having parallel end spaces (342, 442) and extending outwardly from the base end portion. The first and second cell members 34 and 44, including the spaced legs 344 and 444, and the base end portion 342 of the first cell member 34, the base end portion 442 of the second cell member. Outside of the spaced legs 344, 444 of the first and second cell members 34, 44 to form a frame for the stacked array of heat transfer element plates 32 and means 35 for interconnecting End cover member (36) mounted between substrate ends And means 43 for adjoining the top and bottom surfaces of the stacked array of heat transfer element plates 32 and for connecting to the frame to maintain the heat transfer plate 32 in the frame, wherein the first cell member 34 comprises a heat transfer element plate. (32) disposed along an upper portion of the stacked array, wherein the second cell member (44) is disposed along a lower portion of the stacked array of heat transfer element plates (32). 2. A means according to claim 1, wherein said means (35) for connecting the base end portion (442) of the first cell member (34) to the base end portion (442) of the second cell member (44) is a drip-shaped first cell. An element basket assembly comprising a pair of spaced-angle bars that connect a corner of the member (34) to a corner of the drip-shaped second cell member (44) and extend vertically therebetween. 2. The means (42) according to claim 1, wherein said means (42) adjacent the top and bottom surfaces of the stacked array of heat transfer plates (32) and connecting to the frame to retain the heat transfer plates (32) in the frame are end portions of the first cell member (34). At least one retaining bar 48 mounted between the cover member 36 and extending across the top surface of the stacked array of heat transfer element plates 32, the second cell member 44 and the end cover member 36. An element basket assembly comprising at least one retaining bar (48) mounted therebetween and extending across the bottom surface of the stacked array of heat transfer element plates (32). 2. The element basket assembly of claim 1, wherein the spaced legs (344, 444) of each of the first and second cell members (34, 44) extend outwardly with a separating means.