A new era ladle heating device that uses
a dilution/diffusion oxygen combustion system

A DOC (burner) is a burner patented by Praxair, Inc. of the United States.
DOC stands for "Dilute Oxygen Combustion," and refers to dilution/diffusion oxygen combustion.
DOC combustion characteristics
DOC burner injects oxygen and fuel separately at high speeds. Diffusion combustion occurs while mixing in the recycle stream (combustion gas in the combustion chamber), creating a flame with an even temperature without any hot areas.
Low pollution, energy conserving next generation burner
-1 Substantial reduction in fuel consumption volume and CO2. (Combustion gas generation ratio is 1/4 that of air combustion.)
-2 Low NOX.

The vital element in the casting process:
Substantial effects on energy conservation and the environment

Implementation effects
-1

Even flames without hot areas and a recycle stream allows for greater agitation effects to provide even heating down to the bottom of the hearth.
-2

The composition of the combustion gas that is generated is mostly CO2 and H2O, meaning that gas emission increases, leading an increase of heating capabilities and a reduction in ladle heating times.

Advantages/Disadvantages
Advantages

Due to being compact and lightweight, there is no need for large-scale equipment such as a regenerative burner.
Furthermore, reduced operating hours are required to convert existing equipment because there are no issu regarding installation onto lip pour hearth lid heating equipment.
Disadvantages

Costs other than those for fuel are required as the equipment uses paid oxygen (liquid oxygen or PSA) as the oxidant.
*For 13A fuel: 2.3 times the fuel cost required for liquid oxygen, 2.5 times the fuel cost required for PSA.

DOC Burner Basic Structure
Ladle and dundish related equipment engineering achievements
(As of March 2015)		 >>PDF/105KB
Delivery
Year		 Delivery Destination Equipment Name Specifications/Outline Remarks
2004 GODO　STEEL, Ltd.
Funabashi Works		 Ladle (3 vertical units) and TD preheating device fuel conversion Kerosene > 13A Gasification grant
CHIYODA-STEEL CO.,LTD. Ladle (2 vertical units) and TD preheating device fuel conversion Kerosene > 13A Gasification grant
2008 ITOH IRON & STEEL CO.,LTD.
Tsukuba　Works		 TD preheating device fuel conversion Kerosene > 13A
(Ladle heating device new installation)		 Gasification grant
Vertical high efficiency ladle heating device
(2 units)		 Kerosene > 13A
(Ladle heating device new installation)		 Gasification grant
OSAKA STEEL CO., LTD.
Osaka Okajima Works		 TD preheating device fuel conversion Kerosene > 13A Gasification grant
Horizontal ladle heating device (3 units) Kerosene > 13A Gasification grant
2010 ASAHI INDUSTRIES CO., LTD. TD preheating device fuel conversion Reclaimed oil > 13A
Ladle preheating device
(2 horizontal units, 1 vertical unit)		 Reclaimed oil > 13A
2011 CHIYODA-STEEL CO.,LTD. Vertical ladle preheating device DOC installation
(2 units)		 (Development) 13A & PSA Ladle steel insertion capacity 50t
KYOEI　STEEL　LTD.
Nagoya Division		 Vertical ladle preheating device DOC installation
(1 unit)		 13A & PSA Ladle steel insertion capacity 110t
2012 KYOEI　STEEL　LTD.
Nagoya Division		 Horizontal ladle preheating device DOC installation
(1 unit)		 13A & PSA Ladle steel insertion capacity 110t
2013 TOKYO STEEL CO.,LTD.
Utsunomiya Plant		 Vertical ladle preheating device DOC installation (2 units) 13A & liquid oxygen (Subsidy business)
Ladle steel insertion capacity 140t
Chubu Steel Plate Co., Ltd. Vertical ladle preheating device DOC installation (1 unit) 13A & PSA Ladle steel insertion capacity 200t
OTANI STEEL CORPORATION LD preheating device fuel conversion Kerosene > 13A Gasification grant
TD preheating device fuel conversion Kerosene > 13A Gasification grant
2014 SHINKANSAI STEEL CORPORATION
Sakai Works		 Vertical ladle preheating device DOC installation (1 unit) 13A & liquid oxygen Ladle steel Ladle steel insertion capacity 140t
KYOEI　STEEL　LTD.
Yamaguchi Division		 Vertical ladle preheating device DOC installation (2 units) LSIHA ＆PSA (SII subsidy)
Ladle steel insertion capacity 80t
MUKOYAMA STEEL WORKS CO.,LTD. Horizontal ladle preheating device DOC installation (2 units) 13A & PSA (SII subsidy)
Ladle steel insertion capacity 80t
KANTO STEEL LTD. Vertical ladle preheating device DOC installation (1 unit) Kerosene & PSA (SII subsidy)
Ladle steel insertion capacity 70t
Horizontal ladle preheating device DOC installation (1 unit) Kerosene & PSA (SII subsidy)
Ladle steel insertion capacity 70t
SHINKANSAI STEEL CORPORATION
Sakai Works		 Vertical ladle preheating device DOC installation (2 units) 13A & liquid oxygen (SII subsidy)
Ladle steel insertion capacity 140t
JFE Bars & Shapes Corporation
Sendai Works		 Ladle preheating device combustion control system modification Energy saving (fuel 13A)
Colored cells indicate equippment with installed with DOC
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