JPH0432290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat-resistant structure for a heat exchange device, and in particular to an inner retaining wall (heat-resistant structure) formed of a heat-resistant block or brick that can be used in a regenerative heat exchange device. Retaining wall for holding replacement elements).

BACKGROUND OF THE INVENTION As energy costs have increased in recent years, there has been an increasing demand for devices that can conserve heat and reduce fuel costs. One of such devices
For example, US Pat. No. 3,895,918 discloses a heat storage device for pollution prevention. The device of that patent includes a central high temperature combustion chamber or incineration chamber surrounded by a number of equiangularly spaced heat exchange sections. These heat exchange sections communicate with the combustion chamber and an external source of pollutants, such as toxic emissions from industrial processes (industrial emissions).
Industrial effluent is fed by automatic dampers to a predetermined number of the heat exchange sections during a predetermined operating cycle. Each heat exchange section is held on the outside by a perforated steel wall (outer retaining wall) and on the inside (combustion chamber side) by another perforated or louvered metal wall (inner retaining wall). It has a heat exchange bed consisting of a stack of a large number of ceramic (high temperature) heat exchange elements. Since a large number of heat exchange elements are inserted into the space between the two inner and outer retaining walls, a large lateral thrust is exerted on the retaining wall due to the total weight of the heat exchange elements.

When the industrial effluent is forced to flow through a given one or more of the heat exchange sections during a treatment cycle, the temperature of the effluent is equal to that of the gas purified in the combustion chamber in the previous cycle. is enhanced by the residual heat obtained when the heat is discharged through the heat exchange section and stored in the heat exchange elements of the heat exchange section. The incoming industrial waste (into the heat exchanger) enters the combustion chamber after a certain preheating, and its harmful components are oxidized in the combustion chamber. The purified waste is
It is then discharged from the combustion chamber through another heat exchanger into the exhaust circuit and into the surrounding atmosphere.

In such heat storage structures, in order to absorb the lateral thrust exerted by the ceramic heat exchange elements, steel tie rods were conventionally used in many cases between the front retaining wall (hot side) and the rear retaining wall (low temperature side). It was necessary to install it horizontally between the These tie rods also serve to prevent the hot surfaces from bending or deflecting due to heat. Special Belleville washers and nuts are used at the end of the tie rod to adjust the tension of the tie rod. Special horizontal pins are also driven into the side edges of the front retaining wall for reinforcement purposes. The incineration temperature is approx.
For equipment reaching temperatures of 649-871°C (1200-1600°), the hot surfaces were typically made of very expensive materials with low creep properties, such as high nickel-chromium steels. . If the combustion chamber is to be operated at higher temperatures, in the range of about 871-982°C (1600-1800°), even more of such expensive steel must be used.

Furthermore, the inner (front) retaining wall of conventional heat exchange equipment is often subject to the decomposition or other chemical destructive effects of certain components of industrial effluents, and the inner (front) retaining wall made of metal life span is shortened. The metal front retaining wall also has substantially no heat exchange properties.

Although checkerboard-like refractory walls have traditionally been used to provide heat exchange properties, they are not constructed to withstand significant loads. U.S. Pat. No. 2,125,193 discloses forming grooves on the side edges of each refractory block such that the grooves of adjacent blocks cooperate to form axial openings through which oxygen flows. Although the configuration is disclosed, it is incorporated into the surrounding wall of the circular combustion chamber.
It does not teach horizontal arched (curved) walls consisting of multiple refractory blocks with axial passages through them.

Problems to be Solved by the Invention and Objectives of the Invention The present invention is intended to solve the above-mentioned problems associated with the conventional heat exchange element retaining wall of a regenerative heat exchange device, and its purpose is to: More heat resistant than conventional heat exchange element retaining walls used in heat exchange equipment, easier to assemble and maintain than traditional retaining walls, and more resistant to chemical attack, compared to traditional metal walls It is an object of the present invention to provide a heat-resistant wall that has a more excellent heat exchange effect and can impart higher strength to the entire combustion chamber surrounding wall (furnace wall) in which it is incorporated than walls of conventional metal/concrete structures.

Means for Solving the Problems The present invention provides an inner retaining wall for retaining a stack of heat exchange elements of a regenerative heat exchange device, in which a series of rows curved in an arc are directly abutted and connected in the horizontal direction. A curved heat exchange element retaining wall having a monolithic structure constructed by stacking a plurality of rows of a plurality of corrosion-resistant heat-resistant perforated blocks vertically is incorporated into the surrounding wall of a central combustion chamber of a regenerative heat exchange device. This solves the above problem. The holes in each of the above perforated blocks are as follows:
A gas conduit is configured to connect the combustion chambers located on both sides of the inner retaining wall and the corresponding one of the heat exchange sections, and the cross-sectional dimensions of the holes of the perforated block are such that the heat exchange elements are in the heat exchange section. The hole is designed to prevent high-pressure gas from passing through the hole.

The curved inner retaining wall according to the invention can be manufactured more economically, can withstand higher combustion temperatures and chemical attacks, and counteracts the lateral thrust pressures exerted by the heat exchange elements. be able to.

Embodiment Referring to FIG. 1, there is shown a regenerative heat exchange device (hereinafter also simply referred to as a "heat exchange device" or "device") 10 constructed in accordance with the present invention. The device 10 has a dome-shaped central combustion chamber 11 (hereinafter also simply referred to as "combustion chamber" or "chamber") with a plurality of radially inwardly projecting burners 21 . The combustion chamber 11 has a circular cross section, and a circular combustion chamber surrounding wall (hereinafter also simply referred to as "surrounding wall") 27
surrounded by. A plurality of heat exchange sections 12 are arranged around the chamber 11, that is, on the outside of the surrounding wall 27 of the chamber 11, at intervals in the circumferential direction. Each heat exchange section 12 includes a perforated (air permeable, gas permeable) outer heat exchange element retaining wall (hereinafter referred to as "perforated or gas permeable outer retaining wall" or "outer retaining wall" or "retaining wall") made of a metal plate. ) 23 and a heat exchange bed having a large number of high-temperature heat exchange elements 24 arranged inside the retaining wall 23. Industrial waste (hereinafter also simply referred to as "exhaust material") is sent to an annular introduction ring 16 through an introduction duct 17,
It is supplied to the space 20 outside the outer retaining wall 23 in the heat exchange section 12 through a supply duct 9 (see FIG. 2) connected thereto. An inlet valve 14 is arranged in each supply duct 9 connected to each heat exchanger for changing the cycle. Another duct 26 is connected to the space 20 through a top wall 25 covering the top of the heat exchange section 12 . The duct 26 is
A valve 26a is provided for introducing purge gas as described in U.S. Pat. No. 3,895,918, supra, if necessary. Each heat exchange section 12
Furthermore, a discharge duct 8 having an outlet valve 19 is connected to the space 20 . The duct 8 is connected to an annular exhaust ring 15, and the exhaust ring 15 is connected to an exhaust duct 18. Exhaust duct 18
can be connected to an exhaust block and chimney (not shown).

As shown in FIGS. 2 and 3, the stack of refractory heat exchange elements 24 is held on the outside by the above-mentioned perforated outer retaining wall (metal plate) 23, and the combustion chamber 11 The inner side adjacent to the combustion chamber is held by a curved perforated (air permeable) wall portion 27a, which will be described later, and which constitutes a portion of the combustion chamber surrounding wall 27. Therefore, the perforated (air permeable) wall portion 27a may also be referred to as a "perforated (air permeable) inner heat exchange element retaining wall" or "a perforated (air permeable) inner retaining wall".
The circular surrounding wall 27 includes arcuately curved perforated (air permeable) wall portions 27a and arcuately curved nonporous (air impermeable) wall portions 27b which are alternately arranged and connected in the circumferential direction. The combustion chamber 1 is configured by
Formed as a continuous cylindrical lining for 1.

The perforated (air-permeable) wall portion 27a is formed by stacking a plurality of corrosion-resistant and heat-resistant perforated blocks or bricks 28 in a plurality of vertically stacked rows connected in butt relation in a curved row. Therefore, it is constructed as an integral structure. The concave side of the curved inner retaining wall 27a is disposed toward the combustion chamber 11, and the convex side of the inner retaining wall is disposed toward the heat exchange element 24 so as to be in contact with the heat exchange element. Perforated blocks 28 in each row
are arranged in a staggered relationship with the perforated blocks 28 in other rows.

The non-porous (impermeable) wall portion 27b is constructed by connecting a plurality of heat-resistant non-porous bricks 30 in the circumferential direction and stacking them one above the other. The perforated wall portions 27a extend corresponding to the respective heat exchange parts 12, and the non-perforated wall portions 27b extend from the perforated wall portions 27.
interposed between a. Perforated block 28 of each perforated wall portion 27a and adjacent non-perforated wall portion 27b
Non-porous bricks 31 and 32 are interposed between the non-porous bricks 30 and the non-porous bricks 31 and 32, which serve as transition parts or joints.

On the rear or outer side of the solid bricks 30, 31, 32 there is an outer wall 34 made of e.g. "monobloc" or other commercially available low density or high density high temperature insulation material (which may be in the form of bricks). will be established. Further, a metal shell 35 is provided to surround the non-porous bricks 30, 31, 32 and each heat exchange section 12 and support them.

As shown in Figures 2-4, each refractory perforated block 28 is provided for passage of industrial emissions into the combustion chamber 11 for treatment and for exiting the combustion chamber for release of the emissions. It has a number of through holes or passages 28b. In the particular embodiment shown, the total cross-sectional area of the holes 28b in each block 28 is one third of the vertical cross-sectional area of that block. This ratio maintains good overall thermal efficiency for this particular installation by maintaining sufficient flow to fully purify emissions within the combustion chamber without creating unnecessarily high pressure drops. It was confirmed that Of course, the number and size of holes or passages 28b in block 28 can be determined depending on the particular application. Generally, the total volume of passageways 28b will be approximately 30-40% of the volume of the block. The hole or passage 28b is
Combustion chambers 11 located on both sides of the inner retaining wall 27a
A gas conduit is configured to connect the heat exchange section 12 and one corresponding heat exchange section 12. The cross-sectional dimensions of the holes or passages 28b are determined to prevent the heat exchange element 24 from passing through the holes or passages 28b under the pressure of the high pressure gas passing through the heat exchange section 12.

In the illustrated embodiment, each block 28 has a vertical ridge 28a on one side edge and a vertical groove 28c on the other side edge.
, so that the protrusion 28a of each block can be fitted into the groove 28c of the adjacent block. Each block 28, in the illustrated embodiment, includes:
It has a horizontal cross-sectional shape as shown in FIG. 3, making it easy to assemble an arch-shaped (circularly curved) perforated (air permeable) inner retaining wall 27d inside each heat exchange bed 13. Therefore, the combustion chamber surrounding wall 27
Increase the overall hoop strength (strength of joining into the cylindrical shape). In this way, each block 28 has vertical portions (vertical ridges 28a
and a vertical groove 28c). The block 28 extends in front of the opening defined by the non-parallel (U-shaped) walls of each heat exchange section 12.

Effects of the invention Corrosion-resistant and heat-resistant perforated block 2 curved in an arc shape
It has been found that the inner retaining wall 27a consisting of 8 not only exhibits greater mechanical strength than conventional flat metal inner retaining walls, but also achieves considerable manufacturing cost savings. Its assembly is similar to simple masonry work and, unlike traditional metal inner retaining walls, does not require special steel, special washers, special tie rods, or special side drive pins. , no other equipment or assembly costs are required. Moreover, the operating costs of the regenerative heat exchanger can also be reduced, since this wall structure withstands higher combustion temperatures and their harmful effects without resorting to very expensive special steels. Traditional steel walls are
It is more susceptible to chemical attacks (corrosion, oxidation, etc.) than heat-resistant materials, and cannot improve the heat exchange performance of devices as much as heat-resistant materials.

[Brief explanation of drawings]

FIG. 1 is a plan view of the heat exchange device of the present invention, and FIG.
The figure is a partial perspective view of the wall structure seen from the inside of the combustion chamber of the heat exchanger in Figure 1, Figure 3 is a partial sectional view of the wall structure in Figure 2, and Figure 4 is line 4-4 in Figure 3. FIG. 8...Discharge duct, 9...Supply duct, 11...
... Central combustion chamber, 12 ... Heat exchange section, 23 ... Perforated (air permeable) outer retaining wall, 24 ... Heat resistant heat exchange element, 27 ... Surrounding wall, 27a ... Perforated (air permeable) wall portion (perforated inner retaining wall), 27b...non-porous (air impermeable) wall portion, 28...corrosion resistant, heat resistant perforated (air permeable) block or brick, 28a...vertical ridge, 28b... Hole or passage, 38c... Vertical groove, 30... Non-porous (impermeable) brick, 31,3
2...Non-porous (air-impermeable) brick (transition area, joint).

Claims (1)

[Scope of Claims] 1. A heat exchange device having a central high-temperature combustion chamber 11 and a surrounding wall 27 surrounding the combustion chamber, which includes a plurality of spaced apart air-impermeable wall portions 27b made of heat-resistant material 30. (a) a heat exchange part 12 disposed outside the surrounding wall 27 in a space between each of the air-impermeable wall parts 27b so as to be connected to the surrounding wall, and a plurality of heat exchange parts within each heat exchange part 12; an inner holding wall 27a and an air-permeable outer holding wall 23 provided to hold a stack of heat exchange elements 24; means connected to each heat exchange section for draining the purified effluent from the exchange section; the inner retaining wall 27a of each heat exchange section 12 comprises means connected to the spaced apart air impermeable wall 27 of the surrounding wall 27; wall part 27
b, each inner retaining wall 27a is integrally incorporated into the enclosure as an air-permeable wall portion 27a between
Corrosion-resistant and heat-resistant perforated blocks 28 having an inner surface and an outer surface that is in contact with the heat exchange section 12 and that is larger in horizontal dimension than the inner surface are arranged in a row curved in an arcuate shape and abutted at the end surfaces and are horizontally aligned with each other. It is a curved heat exchange element holding wall of an integral structure constructed by stacking a plurality of connected plural rows of the corrosion-resistant and heat-resistant perforated blocks 28 vertically, and the curved inner holding wall 27a is The concave side is the combustion chamber 11
The convex side of the inner retaining wall faces toward the heat exchange element 24 and is in contact with the heat exchange element, and the holes 28b of each perforated block 28
constitute a gas conduit that communicates the combustion chambers located on both sides of the inner retaining wall and the corresponding one of the heat exchange parts, and the cross-sectional dimension of the hole 28b of the perforated block 28 is equal to that of the heat exchange element. 1. A heat exchange device, characterized in that the heat exchanger is configured to prevent the high-pressure gas passing through the heat exchanger from passing through the hole under the pressure of the high-pressure gas passing through the heat exchange section.