JPS5938592A - Basket for heat accumulation type heat exchanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a basket for a regenerative heat exchanger.

Regenerative heat exchangers are used to transfer heat from one fluid stream to another. These use multiple plates that serve as heat storage elements, which are alternately exposed to two fluid streams. The fluid streams have different temperatures and transfer heat from one stream to another. For example, when exposed to a hot fluid stream, the plate absorbs heat, and this heat is transferred to the cold fluid stream when the plate is exposed to the cold fluid stream.

In a common type of such a regenerative heat exchanger, a plurality of −
basket·! is installed on a continuously rotating rotor. Each basket includes a plurality of plates defining air passages therebetween.

At one point along the rotational path of the rotor, a fixed duct structure directs one fluid stream into a passageway in the basket, and at another point along the rotor path, another duct structure directs another fluid stream into the basket. In the regenerative heat exchanger type, the basket retaining member is stationary and the two duct-forming elements rotate relative to it.

One field in which such regenerative heat exchangers are used extensively is in the field of steam boilers. Here, a heat exchanger is used to transfer heat from the hot gases obtained from combustion to the relatively cool (surrounding) intake air used for soot burning. The hot gas stream obtained from combustion is corrosive, so plates exposed to it deteriorate over time. This is especially true for boilers that use fuels that produce large amounts of corrosive gases when burned. The fuel that falls under this category is high-sulfur coal. As a result, the heat exchange plates are assembled in groups. Each group is held within a basket, and the basket is removably installed within the heat exchanger. Therefore, when the boards of a given basket become severely deteriorated, these boards can be replaced and a new set of boards installed.

As the boards deteriorate, they become legs, take up less space, and become more fragile as they deteriorate. 0-
In a conventional heat exchanger with baskets intersecting each other, the plates inside the baskets move for this purpose. Movement of the plates within the basket is caused by the force of the passing steam flow, causing the plates to flap. As the plates move, the plates become brittle due to deterioration and then break down.Obviously, problems arise when the plates begin to move within the basket and when the plates begin to shatter.

During this time, it is best to remove the basket containing the deteriorated board before the board deteriorates. However, this is not always done.

Replacing the basket generally requires the heat exchanger to be taken out of service. There is usually no spare heat converter, so the steam boiler must be shut down. Shutting down the boiler of a large power plant reduces the plant's electrical output and cuts off the supply of electrical energy to the users. Therefore, the POI2- can only be deactivated when a supplementary charger is available from other sources. If adequate supplementary power is not available, the boiler must continue to operate even if the heat exchanger plates are known to have severely deteriorated.

Another factor that influences the timing of basket replacement is that they are often large and heavy, requiring large and powerful mechanical equipment to perform the replacement operation. Such equipment must be brought in from elsewhere, and planning takes time.

One proposed solution to the problem of plate movement is to spring load the stack of plates in the basket to hold the plates in place 11c even as the plates become thinner due to deterioration. An example of this is disclosed in US Pat. No. 8,814.472. Commercial examples of overcast structures maintain the board in the foot position even with slight board deterioration, but severely deteriorated boards may not provide sufficient spring loading to achieve the motion described above. It is. Furthermore, with severely deteriorated boards, is there extra space? It appears that there is not enough spring load to remove it and the plate is in a brittle condition, so the spring load itself has an adverse effect on the heavily deteriorated plate.

In other constructions, the basket framework includes bars across the edges of the basket that abut the edges of the plates and prevent vertical movement of the plates within the basket. An example of such a structure is shown in FIG. 8 of US Pat. No. 8,879,240. Depending on their number and arrangement, the darning bars can form a cage body for hanging heavily deteriorated boards in the basket.

According to the present invention, there is another important factor in the regenerative heat exchanger. That is, it is a gap in the capacity of the heat exchanger. The capacity of the heat exchanger, ie, the amount of heat transferred between the two fluid streams that make up the temperature bracket by a certain amount, is influenced by the mass of the heat storage element, the surface area of this mass, and the material of which this mass is made. Since it is generally practical to change materials, mass and surface area are mainly considered in design. For a given heat exchanger that accepts a buskeratola with a given maximum dimension,
The heat transfer capacity of the heat exchanger is increased because the mass and surface area of the plates disposed in the basket are large. The principal object of the present invention is to maximize mass and surface area while retaining the cage effect obtained by the use of bars across the ends of the basket as described above. Another advantage provided by the invention is that in embodiments of the invention the bars not only prevent longitudinal movement of the heat exchanger plates, but also prevent lateral movement.

According to the invention, the ends of the plates have recesses and the rod extends through these recesses to the end of the basket. The fourth part has sufficient dimensions to receive the rod. The ends of the plates are located approximately at the ends of the basket, ie approximately flush with the outer surface of the bar. This allows the basket to have the maximum mass and surface area of the heat exchange elements and to include bars that prevent longitudinal movement of the plates beyond the edges of the basket. Furthermore, with such a structure, the rod not only prevents the plate from moving in the vertical direction, but also serves to prevent the plate from moving laterally. The reason is that the rods will abut on one or both sides depending on their position within the basket.

The inventor is aware that US Pat. No. 2,579,212 includes some structural elements that pass through the plate, but not at right angles to the plate. However, this structural element (40 in FIG. 8 of the above US special fraud) is a spoke of the rotor, and nowhere is it stated that these have the effect of blocking the plates. Although this US time #f was investigated, the existence of such a blocking effect was not suggested. This is because the illustrated spokes extend through relatively large holes in the plate and the plate does not abut the spokes. The plates can move considerably within the rotor before contacting the spokes.

Attempts were also made several years ago to bond stacks of boards together. These plates, along with long pins, were used as operating members of the basket. Is this attempt a large basket? This was done in order to solve the problem of va, that is, the outer panels bulge outward due to the dimensions of the stack. a hole perpendicular to the plate is drilled through the stack, a pin or rod passing through the hole and welded to the skin;
The stack is compressed and held without bulging. However, this method has become popular. Perhaps the reason is that there has been some discovery in forming holes midway between the edges of the sheet. If you drill one hole at a time in the sheet,
This is because the holes inevitably become misaligned. If a complete stack is to be drilled through key metal holes [2], the drill will contact at least some of the sheets where the shape of the sheets is sloped (where they are used to define passages between sheets). . Contact of the drill with the inclined surface forces the drill to the side, resulting in an off-centered hole and/or breakage of the drill. In any case, its implementation was cancelled.

The present invention will be described in detail below based on illustrated embodiments, but the present invention is not limited thereto.

The basket of FIG. 1 is of the type that can be used in the regenerative heat exchanger shown in FIG. 1.2 of US Pat. No. 1' No. 3,814,472. The heat exchanger has a rotor with a plurality of pockets, each pocket receiving a rotor.

Within the frame lo that the basket of FIG. 1 has is a stack of plates indicated at 11. Each plate of the stack abuts adjacent plates, and the plates have spaced apart portions defining fluid passageways, e.g., 18i. These fluid passages extend from one end of the stack to the other so that the fluid giving or removing heat by transfer flows through the stack in one of the directions indicated by double arrows 14. There is.

The precise shape of the plates forming such gaps (passages) is not critical to the invention. In the illustrated embodiment, two types of plates 15, 16 are arranged alternately f*. Each type of plate has a specific construction, one type of plate being different from the other, and the combination is such that portions of the plates are spaced apart to form passageways.

The frame of the basket includes outer frame plates 19 and 2Q, respectively. The sides of these frame plates are bent to form flanges 19.
Make a and 20af respectively. There are eight bars at each end, consisting of a central bar 21 and two outer bars 22. Each rod is welded to a respective skin 19,20. Although in FIG. 1 the outer bar is spaced apart from the plate 7 flange, many manufacturers will desire to place the bar abutting the flange. The number and arrangement of rods will depend on the particular manufacturer's or user's preferences and the size and shape of the basket for the particular heat exchanger. The rod has an outer surface 21a, 22a and an inner surface 21b.

22b and side surfaces 21c and 22c, respectively. The thickness of each side varies depending on the type of basket, but has a predetermined size and width for a particular basket.

Board J5. lfl has an edge 25. A recess is formed in each of these holes to receive a rod. Accordingly, the plate 15 in FIG. 2 has a quadrilateral section 2 ($) receiving the center rod 21 and a quadrilateral section 27 receiving the outer rod 2z. It has a surface 28 and a surface 29 substantially parallel to the edges of the plate.

The length tl of the surface 28 corresponds to the width of the surface '21c of the rod, and the length of the surface 29 approximately corresponds to the width of the surface 21b of the rod.

The rod therefore fits snugly within the recess, with only sufficient clearance as would normally be provided to facilitate assembly of the basket. Similarly, the recess 27 has surfaces f30 and 81 having lengths approximately equal to the widths of the surfaces 22a and 22b, respectively. In this structure, the ends 25 of the plates and the outer surfaces 21a, 2 of the bars are
2a are substantially in the same plane. Edge 25 is outer surface 21
a, 22a; such a configuration reduces the total surface area of the plate provided within the basket. The remaining plates have recesses corresponding to those described above for plate 15. The materials available for the various parts of the basket are the same as those used for regular baskets.

Since the edges 29, 8 of the plate abut aJzlb and z2b of the plate, respectively, the plate moves vertically (i.e., in the direction indicated by the double arrow 14)? be effectively restrained from doing so. Similarly, the sides 28, 30 (and the opposite side of the basket at 80) abut the sides of the bar to hold the plate against lateral movement.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the basket of the present invention; Fig. 2 is an enlarged perspective view of a part of the board stack used in the embodiment of Fig. 1; Fig. 8 is a perspective view of a part of the board stack used in the embodiment of Fig. 1; FIG. 2 is a view similar to FIG. 2 showing the bar portion. 10...Frame, 11...Bond stack of boards, 18.
...Passage, F5, 16...Plate, 19.2'0...Outer frame plate, 1lla, 20a.../Flange, 21.
・・Center rod, 21 a, 22 a-outer surface, 21 b, 2
2t)--inside. Surface, 22... Outer rod, 25... Edge, 26.27.
... recess, 28, 20.80.31... surface. Patent Applicant: Nidward J. Cullinan 4

Claims (1)

[Claims] L having a space of predetermined size in the heat exchanger for receiving the basket, for passing the fluid from one end of the basket to the other, from which heat is to be given or removed by transfer; an outer frame open at an end, and a stack of heat exchange plates within said frame, each said plate having an end R' generally coincident with said end of the basket.
fr--with the plates abutting adjacent plates of the stack to define fluid passageways therebetween extending from edge to edge of the plates, and the frame having a plurality of plates extending across the front end of the basket.
11, the plate is vertically moved within the basket υ
1, and each of the bars has a first surface of a predetermined width lined up with the edge of the board, and is substantially perpendicular to the edge. With the second side of a predetermined width? In the basket for use in a regenerative heat exchanger, each of the plates has a recess at each position where the plate and the rod abut, each recess substantially corresponding to the predetermined width of the first surface. the rod having a width parallel to the edge of the plate and a length measured at an angle IG to the edge of the plate substantially corresponding to the predetermined width of the second surface; and the plate extends substantially to the end of the basket so that for a basket of a predetermined size, there is approximately the maximum plate surface effective for heat exchange. Dexterous basket.