Combustion – Heated line section feeds flame holder – Distinct exhaust products line heats feed line
Patent
1996-05-22
1998-12-15
Price, Carl D.
Combustion
Heated line section feeds flame holder
Distinct exhaust products line heats feed line
431 11, 432180, 432181, 165 8, F24C 300, F23D 1466, F23L 1502
Patent
active
058488855
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a regenerative burner for recovering waste heat from exhaust gas to preheat combustion air, and more particularly to a regenerative burner for alternately passing the combustion air and combustion exhaust gas through a fixed regenerator to preheat and supply the combustion air by using heat of the combustion gas. Further, the present invention relates to a regenerative heat exchange system for performing heat exchange through a regenerator between gas having a relatively-low temperature (low-temperature fluid) such as the combustion air and gas having a relatively-high temperature (high-temperature fluid) such as the combustion exhaust gas or between any other high-temperature gas and low-temperature gas in, e.g., the regenerative burner, and more particularly to a regenerative heat exchange system in which flowing directions of two types of fluid are fixed on a fluid inlet side and a fluid outlet side to cause no switching of passages.
BACKGROUND OF THE INVENTION
As shown in FIG. 18, for example, a prior art regenerative burner with which an extremely-low amount of Nox is generated has such a configuration that burner gun s (fuel nozzles) 102 are provided in respective wind boxes 101 so as to pierce through the wind boxes 101 so that combustion air supplied via regenerators 103 is mixed with fuel within the burner to be injected in a furnace. In other words, each fuel nozzle 102 and each combustion air injection nozzle (the wind box 101 in this example) form a pair in the prior art burner 104. The two burners 104 form a pair so that one burner 104 exhausts the combustion gas while the other burner 104 carries out combustion. The exhaust heat is recovered from the combustion gas in the regenerator 103 when the combustion gas is exhausted through the wind box 101 of one burner. Since the prior art regenerative burner alternately supplies the combustion air and the fuel to a pair of burners, it requires means for selectively connecting a combustion air supply system and an exhaust system to the burners and means for supplying the fuel to either of the burners. In order to switch passages of the combustion gas and the combustion air, combined use of solenoid valves, or use of a four-way valve or a three-way valve is considered to be employed. Note that a reference numeral 105 denotes a four-way valve; 106, a solenoid valve; 107, a forced draft fan; and 108, an induced draft fan in the drawing.
However, in the prior art burner structure in which the air nozzle and the fuel nozzle form a pair, there occurs a problem such as that the fuel nozzle may be damaged due to the emitted combustion exhaust gas having a high temperature or coking of the residual fuel is generated at the idle burner. In order to prevent the fuel nozzle from being damaged, the arrangement or the structure of the fuel nozzle must be complicated as in a burner disclosed in Japanese patent laid-open publication No. 2-10002, which may involves an increase in the size of the burner. In addition, in case of the regenerative burner employing such a system that the burners alternately perform combustion, since it is preferable for ignition to take a lead time in injection of the combustion air so that injection of the fuel is slightly delayed from that of the combustion air, such a complicated control that the fuel is supplied when a predetermined time has passed after changing of a flow of the combustion air is generally required. Thus, the regenerative burner which requires no switching of the fuel is desirable.
Further, when a combination of solenoid valves are used for switching passages of the combustion gas and the combustion air, the solenoid valves which can be used in the high-temperature atmosphere are expensive and involves increase in the facility cost, and since a gas piping solenoid valve is large in size, increase in a number of gas piping solenoid valves used takes up a space and reduction in a number of the valves used is thereby desirable. Also, in this case, supply of th
REFERENCES:
patent: 1858508 (1932-05-01), Kignell et al.
patent: 5275556 (1994-01-01), Hirose
patent: 5456216 (1995-10-01), Kaji et al.
patent: 5460519 (1995-10-01), Hirose et al.
Matsuo Mamoru
Tanaka Ryoichi
Yasuda Tsutomu
Nippon Furnace Kogyo Kabushiki Kaisha
Price Carl D.
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