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By technology classification

Osaka Gas believes that technologies serve as the foundation of corporate competitiveness, and considers R&D to be one of the most important elements in the strategy to make a difference.
For this reason, Osaka Gas works actively on R&D and commercialization of new technologies, as presented below.

Regenerative burner system

Overview

A regenerative burner is a combustion heating system allowing extremely high-efficient recovery of exhaust heat in the industrial furnace. Owing to its great reduction effect of fuel efficiency, this system has been specifically adopted and popularized in relatively high temperature furnaces, including heating furnaces for rolling, forging furnaces, heat treatment furnaces, melting furnaces, baking furnaces, and deodorizing furnaces, as a superb means for saving cost energy and reducing CO2.

Number of accumulated sales units of Osaka Gas regenerative burner

Principle and performance of regenerative burner system

Regenerative burner system generally ignites a pair of burners integrated with the heat reservoirs alternately at intervals of several tens of seconds. While one burner is burning, the exhaust gas passes through and heats the other burner’s heat reservoir to recover the energy of the exhaust gas. Then, when the other burner burns, the air for combustion in turn passes through the preheated heat reservoir to recover the exhaust gas energy which had conventionally been wasted, to provide high efficient combustion.

Principle of regenerative burner system

As shown above, for example, 1,200℃ exhaust gas will yield at least 1,000℃ preheated air, so that almost 50% of energy saving can be achieved (compared to the case without exhaust gas recovery).

Relation between preheated air temperature and energy-saving ratio (13A, air ratio 1.1)

Features of regenerative burner system

Energy/cost saving of regenerative burner

  • 1.Energy and cost savings
    In general, 35-50% of energy can be saved by adopting the regenerative burner system, though depending on the furnace temperature, air ratio, and operating patterns of the installed unit.

CO2 reduction in regenerative burner

  • 2.Reduction of CO2 emission
    CO2 emissions can also be reduced greatly as leading to a great reduction in use of fuel. By the fuel conversion from oil to natural gas burner, CO2 emissions can be reduced more because CO2 output per unit heat value becomes less.

  • 3.Reduction of NOx emissions
    Since Osaka Gas regenerative burner is all low NOx emission type, total NOx emissions can be reduced along with the reduction of exhaust gas with saving energy.
  • 4.Uniformity of furnace temperature distribution
    Uniform distribution of furnace temperature has been achieved owing to the luminous flame effect by high-temperature preheated air combustion and the furnace air agitation effect by alternating combustion, so that improvement in product quality and time and energy saving effects can be achieved.

Regenerative burner of Osaka Gas

  • 1.Features
    The regenerative burner has mainly been introduced to large-scale plants including rolling furnaces, because its initial cost was high due to its complicated structure compared to the typical burner. However, Osaka Gas has developed the regenerative burner for installation in small- and middle-size factories and achieved small-sized low-cost design by our own technical development.
  • 2.Lineups
    Osaka Gas provides a series of various types/capacities of regenerative burners to cope with various ranges of usage.

Twin-type Regenerative

Self-type Regenerative

Self-type Regenerative for crucible furnace

Insert-type Regenerative

Radiant Tube Regenerative

  • 3.Safety
    The regenerative burners provided by Osaka Gas conform to "The index of safety technology of industrial gas combustion equipment" (Japan Gas Association) so as to be used more safely.

    Other than in these equipments, the regenerative burners are adopted for various purposes from large-scale to small-scale facilities such as car bottom furnace, rotary furnace, atmosphere gas generator, reverberatory melting furnace, pipe muffle furnace, ladle preheater, and rotational retort furnace.

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