JPH0529837B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] 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 emit dirty waste gas. Such processing includes glass melting and non-ferrous metal melting. These waste gases contain solid 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.

Small-scale heat recovery devices, such as regenerative burners, are generally used to recover It is inappropriate as a device. 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 becomes contaminated or clogged with waste gas contaminants. Therefore, thermal storage beds require extensive 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]

According to the invention, therefore, a chamber for storing a heat storage bed in the form of separate particles, a closable inlet for introducing new particles into the chamber in order to replace contaminated particles, and an inlet for introducing new particles into the chamber are provided. A regenerative heat exchanger for a regenerative heat exchange device is provided, characterized in that the regenerative heat exchanger has a closable outlet for removing contaminant particles from the chamber for introduction.

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

〔Example〕

Referring to the drawings, the 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 within a cylindrical shell 4 made of an insulating material of heat-resistant fiber or ceramic fiber, and the cylindrical shell 4 is itself surrounded by a cylindrical metal shell 5 at a gap,
Shell 4 serves as an insulating lining for metal shell 5.

This lining is made of shell 5 as shown in the drawing.
It rests on an inwardly directed annular metal member 6 fixed to the lower end of the .

The outer chamber 3 is formed in the gap between the metal shell 5 and the generally cylindrical outer metal shell 7.

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

The uppermost end of the outer shell 7 also comprises an inwardly directed annular metal member 10 which is secured to the outer shell 7 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 facing annular metal member 11 , which is fixed to the inner metal shell 5 and rests on the annular metal member 10 .

Therefore, in effect, the lining 4 is supported by the inner shell 5. This inner shell 5 is supported by an outer shell 7, and the outer shell 7 is supported by a platform 9.

The upper end of the regeneration heat exchanger 1 has an annular metal member 11
and a cover 12 resting on the top edge of the lining 4
and the cover 12 is suitably secured to these components. The cover 12 is generally circular in shape and has an interior comprised of a ceramic or refractory fiber insulating material 13 housed within a surrounding metal shell 14. The cover 12 serves, in certain modes of operation of the regenerative heat exchanger 1, as an outlet for the discharge of combustion air reserved in the regenerative heat exchanger, and vice versa, as will be understood by those skilled in the art. In this mode of operation, it is provided with a vertically extending opening 15 which serves as an inlet for waste gas for heating the regenerative heat exchanger 1. The cover 12 is also provided with another opening 16 which serves as an inlet port for introducing heat storage particles into the chamber 2 formed by the lining 4 . Opening 1 for obvious reasons
It will be appreciated that 5, 16 lead directly into chamber 2. The opening 16 has a removable viewing glass 1 made of suitably reinforced heat-resistant material.
It is closed by 7.

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 heat 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 includes a large number of spaced metal bars 23 forming a structure in the shape of a pen glass.
have. The part of the bar 23 forming the cage "stem" 24 is joined by two spaced metal strips 25, and the part of the bar 23 forming the cage's grooved uppermost part 26 is joined by a metal strip 25. They are joined by a steel strip 27, which is suitably shaped for its purpose. 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 base in the form of a working metal plate 29 supported on 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 the metal plate 2 is positioned such that in effect the closure assembly 18 is supported on the platform 9.
It is fixed to 9.

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

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 shell 7 has two openings 32 and 33.
2 and 33 are respectively inlets that bring combustion air to preheat the inside of the inner chamber 2, and after the gas passes through the inner chamber 2 and heats or reheats the heat storage bed, the waste gas is converted into heat for regeneration. It serves as an outlet for exhaust from the exchanger. As will be appreciated, when inlet 32 is supplying baking air, outlet 33 is closed;
When the outlet 33 is discharging waste gas, the inlet 3
2 is closed. The inlet and outlet are each formed by two male threaded stud pipes 34 and 35 fixed to the shell 7. The inlet pipe 34 may be connected to a suitable source of heating air, and the outlet pipe 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. 8306795. For this purpose, the cover 12 is provided with a perforated metal plate 37 and an opening 1
A portion of the cover 12 forming the metal plate 5 protrudes from 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.
In one mode of operation of the regenerative heat exchanger 1, the openings 39 of the burner 36 allow the waste gas entering the burner 36 from the forward end 40 of the burner 36 to be routed to a furnace or similar enclosure (not shown). In the reverse operating mode, it serves as an inlet for receiving combustion air preheated in the regeneration heat exchanger 1 from the regeneration heat exchanger 1. The burner 36 includes a fuel gas inlet 41,
The fuel gas is supplied to the burner 36 via the fuel gas inlet 41.
The combustion air may be introduced into the burner 36 to mix with preheated combustion air in the burner 36 and then be passed as combustion gas through the forward end 40 of the burner 36 into the furnace or enclosure to which the burner 36 is connected.
The burner 36 also has a pilot air inlet 42 for the purpose described in detail in my UK Patent Application No. 8306795, as well as a spark probe 43 for ignition purposes and a flame detection sight port 44.

The heat 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 in the form of ceramic spherules 45. In FIG. These particles are introduced into the inner chamber 2 through the inlet port 16 at the top of the regenerative heat exchanger 1 . For that purpose, the sight glass 17 is removed and replaced once a sufficient number of particles have been introduced. Closure assembly 18 at the bottom of heat exchanger 1 for regenerating contaminant particles by shifting plates 31
and the plate 31 is replaced, after which new particles are introduced into the inner chamber 2. In this way, even if the heat storage bed becomes clogged with charge contaminants carried by the waste gas, the heat storage bed can be removed and replaced with new material.

This operation may be performed intermittently or continuously depending on the type and amount of pollutants carried by the waste gas. Thermal storage particles can also be cleaned and reused in some cases. 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, while heating the charge,
Therefore, the evacuation/reloading procedure can be performed with reduced 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 drawings]

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...
…particle.

Claims (1)

[Scope of Claims] 1. A regenerative heat exchanger of a regenerative heat exchange device, comprising an inner chamber for storing heat storage beds in the form of separate particles and fresh particles for replacing contaminated particles. a closable inlet for introducing into the inner chamber, a closable outlet for removing contaminant particles from the inner chamber so that new particles can be introduced; an outer chamber that serves to receive air from the inner chamber or to supply heating air to the inner chamber after passing through the inner chamber; a first end with a first opening through which heated and heated air can exit the inner chamber; an opposite second end with a second opening through which air can enter the inner chamber, the second opening opening into a portion of the outer chamber and oriented in a 1 opening to the second opening, and the portion extends from the second opening to the second opening.
a regeneration device located beyond the end, the outer chamber serving both to exhaust waste gas from the regeneration heat exchanger and to receive air for heating within the regeneration heat exchanger; heat exchanger. 2. Claim 1, wherein the outer chamber has an outlet for discharging waste gas and an inlet for receiving air for heating.
Regeneration heat exchanger as described in section. 3. The outer chamber has an inlet for heating air into the outer chamber, the inlet and the first opening being substantially at the same end of the regenerative heat exchanger. The regeneration heat exchanger according to item 1.