JPS61180890A - Molded shape consisting of synthetic resin for heat accumulation type heat conduction in heat exchanger and heataccumulator formed from said molded shape - 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 Technical Field The present invention relates to a molded body of synthetic resin for regenerative heat transfer in a heat exchanger, which has a number of heat exchange medium flow ducts partitioned in honeycomb shape by walls. The present invention relates to a heat storage body formed from this type of molded body.

BACKGROUND OF THE INVENTION Molded bodies of this type are used for installing a heat storage body in a heat storage chamber of a regenerative heat exchanger. The regenerative heat exchanger can have a stationary regenerator with rotating supply and exhaust hoods for supplying and discharging various heat exchange media, but it is also possible to provide a regenerator with rotary movement. can. In this case, stationary supply and discharge hoods are provided.

In particular, when regenerative heat exchangers are used to reheat boiler exhaust gases that have been previously cleaned in a wet cleaning stage, there is a considerable risk that the regenerative heat exchangers will become contaminated or corrode. This is because, although the water droplet removal device is connected, the cleaning gas coming from the cleaning device' contains a relatively large amount of moisture, and this moisture evaporates on the heat storage body. As a result, deposits form on the inside of the heat storage element or scale builds up, which not only affects the heat conduction but also gradually narrows the flow-through duct through which the heat exchange medium flows.

To this end, a method and a regenerative heat exchanger are already known from DE 32 38 941 A1 for reheating or predrying clean gas obtained from the raw gas of a boiler plant by scrubbing the smoke gases. This method and the regenerative heat exchanger ensure, by simple techniques, a high drying rate of the clean gas, even if the temperature of the exhaust gas is only around 130°, thus considerably reducing the contamination of the regenerative heat exchanger.

The technical idea of the above method and the regenerative heat exchanger for carrying out this method is to use - part of the raw gas heated to a certain degree of temperature twice for heating the regenerative heat exchanger, A portion of the clean gas that has been heated by a relatively high temperature level of a portion of the gas is fed back into the clean gas as a whole, and this feed is replaced by heating the clean gas as a whole by the whole raw gas having a lower temperature level. This is done before reaching the part of the regenerative heat exchanger. By adjusting the overall temperature of the clean gas to a high value in this way, the water droplets contained in it are already evaporated before they enter the regenerative heat exchanger, so that the salts carried along with the water droplets are absorbed into the regenerative heat exchanger. Sticking to the heating surface is sufficiently avoided.

In order to avoid the risk of contamination and corrosion of the heat storage body in the heat storage type heat exchanger of boiler equipment, it is also known to construct the heat storage body in the heat storage chamber from laminated synthetic resin plates (Magazine "' Energie “No. 32, Nr.
12, December 1980, pp. 463-46
(page 5). In this case, a 7'C plastic plate each with a corrugated cross section is provided between two flat plastic plates for forming a heat exchange medium flow duct. However, when forming a heat exchange medium flow duct by laminating heat storage bodies for a heat storage chamber of a regenerative heat exchanger, regardless of whether the heat storage body is composed of a metal plate or a synthetic resin plate, It is clear, for example, from US Pat. No. 2,313,081 alone that the manufacturing costs are considerably high. This applies to the fan-shaped divisions of the heat storage chamber, regardless of whether the individual plates are designed approximately flat or have a longitudinal cross section for the formation of flow-through ducts. This is because plates of various widths are required for assembly, and each of these plates must be assembled into a predetermined sector.

The last-mentioned drawback is always pointed out insofar as the heat storage body of a regenerative heat exchanger is constructed from plate-like elements; The same disadvantage exists if the body-shaped element is designed substantially flat and has plates attached as spacers.

Another drawback of this type of heat storage is that packs of heat storage that are formed by joining individual elements, for example by ultrasonic welding,
It cannot withstand very high mechanical loads and therefore especially water,
It is easily destroyed during the cleaning process using steam and air.

Purpose The purpose of the present invention is to not only enable basic elements for forming a heat storage body to be manufactured easily and economically, but also to provide a heat storage chamber of a regenerative heat exchanger with a heat storage body or a heat storage material having high inherent strength. 1. Also, the heat exchange medium flow duct should not be narrowed or clogged.

According to the invention, blocks with ducts which are adjacent to each other in the width direction of the cross section and in the height direction of the cross section and which are separated by walls and extend in a plain manner from each other can be assembled as an integral extruded part. This is achieved by being shaped like architectural stone.

The technical idea of the present invention is to produce a molded body made of synthetic resin as a block, which has a predetermined cross-sectional size and length, and also has a predetermined number and length of through-flow ducts, in a single manufacturing process. It is in. Therefore, by arranging a large number of identical or similar molded bodies like building stones, it is possible to create an optimal heat storage body without fear of contamination in the heat storage chamber of a regenerative heat exchanger. In particular, according to claim 2, each block corresponds to or is adapted, at least in terms of its cross-sectional configuration, to the geometry and/or size of the cells of the heat storage chamber. was found to be advantageous in actual use.

For the formation of shaped bodies, i.e. blocks, it is necessary not only to have heat conduction properties favorable for the purposes of the invention, but also to deposit impurities carried along with the heat exchange medium, such as soot and salts carried along with water droplets. Synthetic laminated materials are used to prevent this.

According to claim 3, the ratio of the hydrodynamic diameter of the duct through which the heat exchange medium can flow and the thickness of the wall in the block delimiting the duct is 1:
It is particularly advantageous if it lies between 0.2 and 1:0.3.

According to claim 4, the shaped body according to the invention is characterized in that the blocks have a polygonal shape whose contour is geometrically similar to the cross-sectional shape of the individual duct through which flow is possible. It is characterized by According to claim 5, the individual flowable ducts in the block have a square or rectangular cross section, and the block has a square or rectangular contour. According to claim 6, the block has a length that is between 10:1 and 50=1 with respect to the hydrodynamic diameter of the duct.

In actual use of this type of block-shaped extrusion molded part made of synthetic resin, the side length of the cross section of the molded part is between 10 g and 300 g, and the direction normal to this cross section is It has been found to be advantageous for the length to be between 150 and 500 meters. In this case, it is advantageous if the lateral length of the cross section of the number of flowable ducts inside the block is between 7 and 10, while adjacent flowable ducts are bounded inside the block. The wall thickness can be between 1.5 and 31 DI.

According to claim 7, the boundaries of the cross-sections of the blocks are all constituted by flat walls.

According to claim 8, the thickness of the boundary wall can then be approximately half the thickness of the wall bounding the through-flow duct inside the block.

According to claim 9, the heat storage body or heat storage material of a regenerative heat exchanger, which in particular has a stationary heat storage chamber, but can optionally also have a rotating heat storage chamber, may be an individual a number of integral extruded parts formed as blocks of plastic and made of synthetic resin are arranged in the housing and/or framework of the heat storage chamber side by side and stacked one above the other; , that all the blocks are arranged so as to occupy the same direction in the housing and/or framework by their ducts through which they can flow, and that the blocks stacked in the longitudinal direction of the ducts through which they can flow are They are characterized by being aligned and oriented by ducts through which flow can flow.

A heat storage body for an annularly demarcated heat storage chamber in which the heat storage chamber housing and/or framework is divided into fan-shaped sections comprises:
According to claim 10, the boundary surfaces of the individual fan-shaped parts of the regenerator housing and/or the framework are provided with a flat support surface or contact surface, the size of the support surface or contact surface being , corresponds to the side length of the cross section of at least one block, i.e. the extruded part, and these supporting surfaces, i.e. contact surfaces, respectively, correspond to the abutment position between at least two stacked blocks. It is characterized by certain things.

According to claim 11, each block can also be provided in a sheet metal cover, which can also consist of another impact-resistant laminate material suitable for receiving the blocks.

The cross-sectional shape of the block installed in such a cover is already f'W! at the extrusion stage so that it can be fitted into the cover. ? The dimensions can be made precise to correspond to the geometry and/or size of the cells of the regenerator. According to an advantageous development of claim 12, each block is formed from a prefabricated extruded part into the cover, corresponding to the geometry and/or size of the cells of the heat storage chamber. It can be cut and shaped before insertion.

A heat storage body to be incorporated into a heat storage chamber of a regenerative heat exchanger which is divided into a large number of cells is provided according to claim 13, in which at least the filling of the individual cells corresponds to each other in a complementary manner. Advantageously, it is formed from a plurality of blocks forming a cross section.

By applying the invention, which is based on standardized individual moldings made of synthetic resin, the various installations in the heat storage chamber can be adapted to the conditions with simple assembly operations, and the moldings can be A heat storage body or heat storage material for the regenerative heat exchanger should be provided, such that the individual shaped bodies can be replaced section by section in the event of damage or in the event of excessive narrowing or blockage of the flow-through duct. is obvious.

Actual IM example Next, embodiments of the present invention will be described using the accompanying drawings.

Figure 1 shows a heat storage body 2 in a heat storage chamber 3 of a heat storage type heat exchanger.
1 is a perspective view of a molded body 1 suitable for installing a This arrangement is illustrated in FIGS. 2 and 3. As can be seen from FIGS. 2 and 3, the heat storage body 2 consists of a large number of molded bodies 1, and these molded bodies 1 are stacked horizontally and vertically in the heat storage chamber 3. The placement is distorted so that it appears. In this case, the heat storage chamber 3 can be delimited annularly by an outer surface 4 and an inner surface 5 and can be partitioned fan-shaped by radially extending columns and/or walls 6 .

It is preferred that the individual sectors 7 of the housing or framework of the storage chamber 3 are provided with special attachment elements 8atab, 8c on their outer and inner surfaces 4 and 5 as well as on the radial struts and/or walls 6. It is a purpose.

These mounting elements 8a, 8b, 8c each have a flat support area, i.e. a contact area 9a; 9b's9b
9c'+9c', and its size is equal to the side length of at least one molded body 1 in the cross section, as shown in FIG.

In particular, as can be seen from FIG. 3, the mounting with support areas, i.e. contact areas 9a:9b', 9b':9c', 9c', means that the elements 8a, 8b, 8c each have at least one outer surface. 4 and two raised molded volume parts beside the inner side 5 and the radial struts and/or walls 6 of the storage chamber 3 are arranged.

As can be seen in FIG. 1, the individual molded bodies 1 form a block 10 which is formed as an integral extruded part. The block 10 is made of a synthetic resin that not only has excellent thermal conductivity but also does not attract contaminants such as soot and/or salt.

In this connection, it has proven particularly advantageous to manufacture the individual blocks 10 as extruded parts made of polyethylene sulfone plastic.

This type of synthetic resin is known, for example, under the BASF trademark "UNras'on".

The block 10, manufactured as a one-piece extruded part of synthetic resin, is formed as a hollow body and has a number of through-flow ducts 13 which are adjacent to each other in the width 11 of its cross section and in the height 12 of its cross section. have. The through-flow duct 13 extends in the normal direction to the cross section of the block 10,
That is, they extend parallel to each other in the longitudinal direction 14 of the block 10, and are partitioned into a comb shape by walls 15 and 16.

In the embodiment of the block 10 illustrated in FIG. 1, the block 10 is provided with eight through-flow ducts 13 each in the direction of the width 11 of the cross section and in the direction of the height 12 of the cross section, so that the block 10 has 64 throughflow ducts 13. A through-flow duct 13 is provided.

It is expedient to form the block 10 polygonally so that its contour is geometrically similar to the cross-sectional shape of the individual flow duct 13. For example, individual flow-through ducts 13
If the block 10 has a square or rectangular cross section, it is preferable that the block 10 also has a square or rectangular outline.

However, it is also possible for some or all of the blocks to have a trapezoidal or parallelogram-shaped contour, so that the cross section of the flow-through duct 13 is triangular.

Block 1 manufactured as an integral extruded part
In the embodiment shown in FIG.
and the thickness of the walls 15,16 separating the through-flow ducts 13 from each other, for example 1:0.
．． It has been found to be advantageous to have a ratio between 2 and 1:0.3.

Each throughflow duct 13 actually has, for example, 7 circles and 10M.
In this case, the bomb 19 or 20 of the wall 15,16 should be selected between 1.51WIn and 3WIn.

Also, the side length 1] and 1 in the contour surface area of the block 10
2 is selected between 100 and 300 pieces, and block 1
The length 14 in the normal direction to the base of 0 is 1501
It has also been found to be advantageous to choose between 101 and 50011 m.

Block 10 for the hydrodynamic diameter of the flow-through duct 13
The length 14 is for example between 10:1 and 50:1.

Other features of the construction of the block 10, such as when the block is square or rectangular in shape, have a parallelogram profile, or if two walls facing each other at the periphery are of the same length. For example, the cross-sectional boundaries of the block 10 consist of one flat wall 22 on all sides.

However, if the block has a trapezoidal profile, the opposing walls will have different side lengths, so these opposing walls will bend at equal intervals, and in this case, the wall with the longer side will bend. It curves convexly, and the shorter side wall curves concavely.

It has been found to be expedient in many cases to make the boundary wall 22 of each block 10 approximately half the thickness of the walls 15 and 16 separating the flow ducts 13 inside the block 10. In this way, in the contact area of two blocks 10 that are adjacent to each other inside the heat storage body 2, a wall thickness equal to the wall thickness inside the individual blocks 10 is obtained.

By constructing the molded body 1 or the block-shaped integral stamped part 10 forming it according to FIGS. 2 and 3, all blocks 10 have their throughflow ducts 13 oriented in the same direction. The blocks 10, which are received in the housing and/or the frame of the heat storage chamber 3 in an oriented state and stacked in the longitudinal direction of the through-flow ducts 13, also have their through-flow ducts 13 aligned.

The shaped body 1 or block 10 described above is particularly advantageously suitable for forming a heat storage body 2 or heat storage material in a stationary heat storage chamber 3 that is annularly delimited and divided into sectors. A regenerative heat exchanger with a rotating heat storage chamber can also be used for forming the heat storage body 2, ie, the heat storage material.

In this case, the relatively lightweight design of the block 10, which is made of synthetic resin as an integral extruded part, has particularly advantageous results.

As can be seen from FIGS. 4 and 5, the individual fan-shaped portions 7 of the housing or framework of the heat storage chamber 3 are divided into several self-contained cells a, each adjacent to one another and each having an approximately trapezoidal boundary wall. It can be divided into 7b. In this case, as shown in FIGS. 4 and 5, blocks 10a and 10b having corresponding contours can be inserted into each self a*7b.

Blocks 10a and 10b can be extruded as compacts that exactly match the dimensions of the individual cells a+7b, but blocks 10a and 10b can be extruded with different geometries and/or Depending on the dimensions, it is advantageous to cut from a prefabricated extruded part and then insert it into a sheet metal cover 23a or 23b adapted to the contour of the respective self a or 7b. Instead of the sheet forces 1<-23a and 23b, it is also possible to use covers made of other laminate materials, especially impact-resistant materials.

As shown by thick solid lines in FIG. 5, the heat storage body 2 is formed into a heat storage type heat exchanger by filling the individual cells a and 7b with several blocks that can be cut from extruded parts manufactured in advance. It can also be formed in the individual cells a, 7b of the heat storage chamber 3 of the vessel. For example, the cell a on the left side of FIG. 5 is filled by arranging five blocks with different contour shapes. The cell on the right side of FIG. 5 is filled with three blocks of different contour shapes, while the cell b of FIG. 5 is filled by mirror-image juxtaposition of blocks with the same contour shape. In this case, the individual blocks are brought together by a thin plate cover 23a or 23b, which allows them to be exchangeably accommodated in the self-container a or 7b.

The molded body 1 shown in FIG. 6 is a block 10 having a trapezoidal outline as an extrusion molded part made of synthetic resin.
It is created as. The shaped body 1 is provided with ducts 13aw13be13c through which flow can flow, which ducts have different opening cross-sections, ie through-flow cross-sections. That is, the duct 13a has a square opening cross section, that is, a through-flow cross section.
, while the duct 13b has an approximately hexagonal through-flow cross-section, and the duct 13c has a slit-shaped opening cross-section.

Because the block 10 has a trapezoidal profile, the walls forming the sloped sides of a block have different thicknesses in the direction from one end of the wall to the other; are equal, the duct 13 immediately adjacent to the wall
It is clear that as13b*13c has a cross-sectional shape that deviates more or less from the normal standard shape.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a block, that is, a molded body, for installing a heat storage body or heat storage material in the heat storage chamber of a regenerative heat exchanger, which is approximately the actual size, and Fig. 2 is a housing or framework of the heat storage chamber. 2 is a plan view of an annularly delimited regenerator for a regenerative heat exchanger in which the regenerator is divided into fan-shaped parts, and for simplicity, the regenerator or 3 is an enlarged view of the region I in FIG. 2, and FIG. 4 is a plan view corresponding to FIG. 2 of a modified embodiment of the heat storage chamber of the regenerative heat exchanger. Figure 5 is the ■ of Figure 4.
The sixth figure is a perspective view of a block for installing a heat storage body or a heat storage substance in the heat storage chamber of a regenerative heat exchanger, that is, a molded body, and the block has a trapezoidal outline. death,
FIG. 3 shows, for simplicity, ducts through which flow can flow with different opening cross-sections; 1... Molded body, 2... Heat storage body, 3... Heat storage chamber, 4
t5.6... Regenerator housing and/or frame 17+7at7b... Cell, 9 a: 9 b', 9b": 9 c'*9c'
...Support area (contact area), -10, 10a, 10b-block, 11...Block cross-sectional width, 12...Block cross-sectional height, ] 3 + 13 a + 13 b + 13 c
"" Heat exchange medium flow duct, 15.16... wall

Claims (13)

[Claims] (1) In a molded body made of synthetic resin for regenerative heat transfer in a heat exchanger, which has a number of heat exchange medium flow ducts partitioned in a honeycomb shape by walls, the cross-sectional width (11) A block (10) with ducts (13) which are adjacent to each other in the direction and the height (12) of the cross section and which are separated by walls (15, 16) and extend parallel to each other.
A molded article characterized in that it is formed as an integral extruded part like architectural stone. (2) Each block (10 or 10a, 10b) is a cell (3) of the heat storage chamber (3) at least in terms of its cross-sectional configuration.
7a, 7b), characterized in that it corresponds to or is adapted to the geometric shape and/or size of
A molded article according to claim 1. (3) A duct (1
3) and the thickness (19 or 20) of the internal wall (15 or 16) of the block (10) separating the duct (13) is 1:0. 2 and 1:0.3
The molded article according to claim 1 or 2, characterized in that the molded article is between. (4) The block (10) has individual flowable ducts (
13) cross-sectional shape (17/18) and outline (11/12)
4. Molded body according to claim 1, characterized in that the molded bodies have geometrically similar polygonal shapes. (5) characterized in that the individual flowable ducts (13) inside the block (10) have a square or rectangular cross section, and the block (10) has a square or rectangular contour; A molded article according to any one of claims 1 to 4. (6) The length (14) is such that the block (10) is between 10:1 and 50:1 to the hydrodynamic diameter of the duct.
).
The molded article according to any one of Items 1 to 5. (7) Any one of claims 1 to 6, characterized in that the boundary of the cross section of the block (10) is entirely composed of flat walls (22 or 23).
The molded article described in . (8) The thickness of the boundary wall (22) is approximately half the thickness (19 or 20) of the wall (15 or 16) bounding the through-flow duct (13) inside the block (10). The molded article according to any one of claims 1 to 7, characterized in that: (9) In a heat storage body for integration into a heat storage chamber of a regenerative heat exchanger, a number of integral extruded parts formed as individual blocks (10) and made of synthetic resin form part of the housing and/or framework of the heat storage chamber. are arranged side by side and stacked one above the other in the housing, and all blocks (10) are connected to said housing and/or framework by means of their ducts (13) through which flow can occur. The blocks (10) stacked in the longitudinal direction of the duct (13) through which flow can flow are arranged so as to occupy the same direction within the blocks (13), and the blocks (10) stacked in the longitudinal direction of the duct (13) through which flow can flow are aligned. A heat storage body characterized by being oriented. (10) for an annularly bounded regenerator in which the regenerator housing and/or framework is divided into fan shapes;
In the heat storage body according to claim 9, the boundary surfaces of the individual fan-shaped portions of the heat storage chamber housing and/or the framework (4, 5, 6) are flat support surfaces, that is, contact surfaces (9a;
9b', 9b'';9c',9c''), the size of the support surface or contact surface being at least one block (
10), i.e. correspond to the side length (11 or 12) of the cross section of the extruded part, and their supporting surfaces, i.e. contact surfaces (9a; 9b', 9b'';9c',9c'') but,
A heat storage body, characterized in that it is located at least in the end region of each block (10) and/or in the abutment position between two stacked blocks. (11) Any one of claims 1 to 3 and 7, characterized in that each block (10a, 10b) is provided in a thin plate cover (23a, 23b). 1. The molded article according to item 1. (12) Each block (10a, 10b) has a heat storage chamber (3
) are prefabricated extruded parts (
1), the molded article according to any one of claims 1 to 3, 7, and 11. (13) In a heat storage body to be incorporated into a heat storage chamber of a regenerative heat exchanger that is divided into a large number of cells, the filling of at least the individual cells (7 or 7a, 7b) complements each other so that the cells ( A plurality of blocks (10 or 10a, 10b) forming a cross section corresponding to 7 or 7a, 7b)
) A heat storage body characterized by being formed from.