JPS63131992A - Heat exchanger for regeneration of regeneration 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] [Industrial application field] The present invention relates to a regenerative heat exchanger for a regenerative heat exchange device.

[Conventional technology]

Approximately 50% of the fuel gas used in high temperature processing is used in plants that produce dirty waste gases. Such processing includes glass melting and non-ferrous metal melting. These waste gases contain homogeneous unreacted contaminants originating from the charge being treated or other contaminants in the form of vapor phase compounds that condense when the waste gases are cooled.

[Problem that the invention seeks to solve]

Although these waste gases are by no means an ideal recoverable heat source for preheating combustion air for fuel gas, they can be used for preheating combustion air using conventional regenerative heat exchange equipment. Attempts were made to exploit the potential of gas.

For example, small-scale heat recovery devices such as regenerative burners
They are generally unsuitable as heat recovery devices because the flue gas (waste gas) passages within the burner tend to become clogged by materials carried in the flue gas. Additionally, many of the contaminants are corrosive to the metals from which regenerative burners are made.

On the other hand, when a regenerative heat exchanger using a conventional regenerative heat exchanger is used to extract waste heat from waste gas, the heat storage bed through which the gas passes can become contaminated or clogged with waste gas contaminants. Thermal storage beds are large-scale and require cleaning and maintenance.

Therefore, an object of the present invention is to provide a regenerative heat exchanger for a regenerative heat exchange device that solves these problems.

[Means for solving problems]

Thus, according to the invention, there is provided a chamber for storing a thermal storage bed in the form of separate particles, an inlet that can be closed to allow new particles to be introduced into the chamber to replace contaminated particles, and an inlet for introducing new particles into the chamber. A regenerative heat exchanger for a regenerative heat exchange device is provided, characterized in that the regenerative heat exchanger has a closable outlet of a reservoir for removing contaminant particles from the chamber.

An embodiment of the invention will now be described with reference to the accompanying drawings.

〔Example〕

Referring to the drawings, a regeneration heat exchanger 1 has an inner chamber 2 for accommodating a heat storage bed, and an outer chamber 3 surrounding the inner chamber.

The inner chamber 2 is formed in a cylindrical shell 4 made of heat-resistant fiber or ceramic fiber insulation material, which is itself surrounded by a cylindrical metal shell 5 at a gap, the shell 4 serves as an insulating lining for the metal shell 5.

This lining rests on an inwardly directed annular metal member 6 secured to the lower end of the shell 5 as shown in the drawings.

The outer chamber 3 is formed in the interstitial space between the metal shell 5 and the generally cylindrical Araku metal shelf.

The araku shell 7 has at its lowermost end an inwardly directed annular metal member 8 which is fixed to the outer shelf and rests on a platform 9. Platform 9 supports regenerative heat exchanger 1 off the ground.

The uppermost end of the Araku shell 7 also comprises an inwardly directed annular metal member 10 which is secured to the outer shelf and serves as a support for the inner metal shell 5. For this purpose, the uppermost end of the inner metal shell is provided with an outwardly directed annular metal member 11.
1 is fixed to the inner metal shell 5 and rests on the annular metal member 10.

Therefore, in effect, the lining 4 is the inner shell 5
It is supported by This inner shell 5 is supported by an outer shelf, and the outer shelf is supported by a platform 9.

The upper end of the regenerative heat exchanger 1 has a cover 12 which rests on an annular metal member 11 and a lining 40, the cover 12 being suitably secured to these components. The cover 12 is generally circular in shape and has an interior comprised of a ceramic or heat resistant fiber insulating material 13 housed within a surrounding metal shell 14 . As one skilled in the art will understand, the cover 12 serves as an outlet for the discharge of combustion air preheated in the regenerative heat exchanger in the mode of operation of the regenerative heat exchanger 1 and vice versa. It is provided with a vertically extending opening 15 which serves as an inlet for waste gas for heating the regenerative heat exchanger 1 in the operating mode. The cover 12 also includes heat storage particles in the chamber 2 formed by the lining 4.
It is provided with another opening 16 which serves as an entry boat for introduction into the interior. For obvious reasons opening 15.1
It will be appreciated that 6 opens directly into chamber 2. The opening 16 is closed by a removable viewing glass 17 made of suitably reinforced heat-resistant material.

The lowermost end of the chamber 2 is closed with a closure assembly 18, shown in detail in FIG. 2, which serves to support the bottom end of the thermal storage bed. The closure assembly 18 has an uppermost portion in the form of a metal cage 19 and a lowermost portion 20 consisting of a cylindrical metal ring 21 secured to the lower edge of the cage 19 and having a circular flange 22 at its lowermost end. have.

The cage 19 has a number of spaced metal bars 23 forming a structure in the shape of a champagne glass.

A portion of the bar 23 forming the "stem" 24 of the cage is 2
A part of the bar 23 forming the grooved uppermost part 26 of the cage is joined by a metal strip 27, which is suitable for the purpose. It is appropriately shaped. The grooved portion 26 of the cage 19 extends inwardly into the lowermost end of the inner chamber 2 and terminates short of the inner wall of the lining 4. An annular plate 28 is fixed to the edge of the grooved part 26 of the cage 19 so as to serve as a barrier to the escape of heat storage particles between the cage 19 and the lining 4.

The platform 9 has a pedestal in the form of a perforated metal plate 29 supported by four metal legs 30 (only two are shown in the drawing) of chevron-shaped cross section.

The uppermost portion of the metal ring 21 of the closure assembly 18 is located within the hole in the metal plate 29 and is secured to the metal plate 29 such that in effect the closure assembly 18 is supported on the platform 9. .

The lowest end of the metal ring 21 is a removable circular plate 3
1, this circular plate 31 is fixed to the flange 22 with removable bolts (not shown).

The spaces between the bars 23 of the cage 19 allow combustion air to enter the inner chamber 2 and waste gases to exit from the inner chamber 2 as before.

Referring to FIG. 1, the outer metal shelf comprises two openings 32.33, respectively an inlet for providing combustion air for preheating the interior of the inner chamber 2, and an inlet for providing combustion air for preheating the interior of the inner chamber. 2 and serves as an outlet for the waste gas to exit the regeneration heat exchanger after heating or reheating the heat storage bed.

As will be appreciated, when the inlet 32 is supplying combustion air, the outlet 33 pretends to be closed, and likewise when the outlet 33 is discharging waste gas, the inlet 32 is closed.

The inlet and outlet are each formed by two male threaded stud vibes 34 and 35 fixed to the shelf.

The inlet vibe 34 may be connected to a suitable source of combustion air, and the outlet vibe 35 may be connected to a flue.

The opening 15 in the cover 12 communicates with a regenerative burner 36 of the type disclosed in the applicant's UK Patent Application No. 8.306.795. For this purpose, the cover 12 is provided with a perforated metal plate 37 , the part of the cover 12 forming the opening 13 protruding through the hole in the metal plate 37 . This metal plate 37 is fixed to a plate 38 which forms a flange in a corresponding opening 39 of the burner 36.

The opening 39 of the burner 36 is connected to the opening 39 of the regeneration heat exchanger 1.
In one mode of operation, the forward end 40 of burner 36 serves as an outlet for exhausting the waste gases entering burner 36 from a furnace or similar enclosure (not shown); in the opposite mode of operation, it serves as a regenerative heat exchanger. It functions as an inlet for receiving combustion air preheated in the vessel 1 from the regeneration heat exchanger 1. The burner 36 includes a fuel gas inlet 41 through which fuel gas is introduced into the burner 36 to be mixed with preheated combustion air in the burner 36 and then used as combustion gas to enter the burner 36 . front end 40
From there, the burner 36 can be fed into a connected furnace or enclosure.

The burner 36 also has a pilot air inlet 42 for the purpose described in detail in our UK Patent Application No. 8.306.795, together with a spark probe 43 for ignition purposes and a flame detection sight port 44. are doing.

The thermal storage bed itself consists of small discrete particles of any suitable shape and made of insulating material.

In FIG. 1, the particles of the heat storage bed are ceramic spherules 45.
It is in the form of Heat exchanger 1 for regenerating these particles
into the inner chamber 2 through the inlet port 16 at the top of the . For that purpose, the viewing glass 17 is removed and, once a sufficient number of particles have been introduced, this viewing glass 17 is removed.
Undo 7.

Contaminant particles can be removed from the closure assembly 18 at the bottom of the regenerative heat exchanger 1 by shifting the plate 31 and replacing the plate 31 before introducing new particles into the inner chamber 2. In this way, even if the thermal storage bed becomes clogged with charge contaminants carried by the waste gas, it can be removed and replaced with fresh material.

This operation may be performed intermittently or continuously depending on the type and amount of pollutants carried by the waste gas. Heat storage particles can also be cleaned and reused if present. By automating this drain/recharge procedure, there is no need to manually clean the regenerative heat exchanger, which is normally required when using conventional regenerative heat exchangers. In addition, the evacuation/recharging procedure can be performed while heating the charge and thus reducing downtime for maintenance.

The inner shell 5 and lining 4 are air cooled during the air preheating cycle, which is advantageous in extending the life of the lining 4.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the regeneration heat exchanger of the present invention. FIG. 2 is an enlarged side sectional view of the lower part of the regeneration heat exchanger shown in FIG. 1. [List of main reference numbers] 1 Regeneration heat exchanger 2・Chamber 16 Inlet 45, Particles

Claims (3)

[Claims] (1) A regenerative heat exchanger of a regenerative heat exchange device, comprising a chamber for storing a heat storage bed in the form of separate particles and closing to allow new particles to be introduced into the chamber to replace contaminated particles. 1. A regenerative heat exchanger, characterized in that it has an inlet capable of opening the chamber and a closable outlet for removing contaminant particles from the chamber so that new particles can be introduced. (2) The regeneration heat exchanger has an inner chamber for storing a heat storage bed, surrounds the inner chamber, and serves to receive waste gas from the inner chamber after passing through the inner chamber, or heat the inside of the inner chamber. an outer chamber that serves to exhaust waste gas from the regeneration heat exchanger or to provide air for heating within the regeneration heat exchanger. A regenerative heat exchanger according to claim 1, characterized in that the regeneration heat exchanger is adapted to accept the following: (3) The regeneration heat exchanger according to claim (2), wherein the outer chamber has an outlet for discharging waste gas and an inlet for receiving heating air.