Combustion – Heated line section feeds flame holder – Distinct exhaust products line heats feed line
Patent
1994-12-15
1996-05-28
Jones, Larry
Combustion
Heated line section feeds flame holder
Distinct exhaust products line heats feed line
431 11, 126 91A, 432150, F23D 1144
Patent
active
055205348
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a heating apparatus, which uses regenerative burner units including at least a pair of regenerative burner units having a fuel injection nozzle and a heat regenerator provided for a combustion air supply path and employing such an alternative change-over combustion system that one regenerative burner unit is supplied with fuel through a fuel shut-off valve and a fuel change-over valve, and supplied with combustion air through a supply and exhaust change-over valve to carry out combustion operation, while the other regenerative burner unit is operated for heat regeneration by passing a combustion waste gas, and an operating method of such an heating apparatus.
BACKGROUND ART
Such a heating apparatus is well known in the art (See Japanese Patent Laid-open No. 2-254210) and can be used to carry out exhaust heat recovery, resulting in enhancement of thermal efficiency.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to ensure combustion stability of a heating apparatus including one regenerative burner unit for combustion operation and another regenerative burner unit for regenerative operation by relatively simple means.
Further, according to the present invention, it is possible to more enhance thermal efficiency of the heating apparatus. In addition, according to the present invention, it is possible to prevent a thermally damageable member from being exposed to a hot combustion waste gas.
Besides, according to the present invention, it is possible to facilitate removal or attachment of a heat regenerator in the regenerative burner unit of the heating apparatus, and facilitate exchange of only one part thereof.
According to the present invention, at least one sensor for measuring a temperature of the combustion waste gas is mounted in a conduit for externally exhausting the combustion waste gas through a supply and exhaust change-over valve.
In the heating apparatus according to the present invention, flow regulating valves are respectively provided for air conduits for supplying combustion air and interposed between the respective regenerative burner units and the supply and exhaust change-over valve.
A fuel change-over valve includes one three-way valve which is attached to both the regenerative burner units in common. The supply and exhaust change-over valves may include two three-way valves respectively attached to both the regenerative burner units.
The heat regenerator of the regenerative burner unit constituting the heating apparatus includes a plurality of segments. The segment itself may be formed by the heat regenerator, or a large number of heat regenerating elements may be accommodated in a segment-shaped container.
The regenerative burner unit includes a main burner and a pilot burner, and a burner gun of the main burner includes the pilot burner and a combined ignition and flame detection electrode for the pilot burner.
With respect to an operation of the heating apparatus as described above, according to the present invention, it is proposed that the temperature of the waste gas may be measured after providing heat for the heat regenerator of the regenerative burner unit for regenerative operation so as to change the fuel change-over valve and the supply and exhaust change-over valve depending upon the measured waste gas temperature.
Further, successive measurement on a specified cycle is made to measure the unburnt gas concentration of the combustion waste gas externally exhausted from the regenerative burner unit for regenerative operation through the supply and exhaust change-over valve. When the unburnt gas concentration detected in a specified decision cycle increases to exceed a specified upper limit after a time point where the unburnt gas concentration exceeds a specified lower limit, fuel fed into the regenerative burner unit for combustion operation is immediately shut off. When the detected unburnt gas concentration is between the upper limit and the lower limit, an alarm is activated at a time of end of the cycl
Abe Yoshio
Hirata Motohiro
Kojima Kazuhiro
Kuramoto Koushi
Nakagawa Tsuguhiko
Jones Larry
Kawasaki Seitetsu Kabushiki Kaisha
Otto Corporation
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