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Volume 52, Issue 10
Displaying 1-8 of 8 articles from this issue
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[in Japanese]1973 Volume 52 Issue 10 Pages 755-756
Published: October 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1708K) -
Yoshiro Morita, Masami Takayasu1973 Volume 52 Issue 10 Pages 757-765
Published: October 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn this paper, the appearance and the mechanism of the catalytic reduction of NO are generalized. The most interesting matter is the promotive action of Oxygen. Some discussions refer to this effect.View full abstractDownload PDF (1111K) -
Masaaki Oya1973 Volume 52 Issue 10 Pages 766-770
Published: October 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSNitrogen oxides are important in air pollution control because they are involved in photochemical reactions in the atmosphere. Stationary sources, the largest single source category contribute over 60 percent of all the manmade NOx emitted in Japan.
When fossil fuels are burned with air, some of the oxygen and nitrogen gas present combine to form NO.The main factors in NOx formation are: the flame temperature, the residence time the combustion gases are maintained at that temperature, and the amount of excess air present in the flame. In addition, nitrogen in fuels is also related to NO formation.
The theoretical calculations were based on kinetic and thermodynamic data in the literature.View full abstractDownload PDF (565K) -
Yoshimi Ishihara1973 Volume 52 Issue 10 Pages 771-777
Published: October 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe nitrogen oxides removal processes have been developed to tr eat the tail gases from nitric acid plants, or metal pickling plants . In recently, research and developement of combustion flue gas treatment for removing nitrogen oxides have been started.
The major problems at the combustion flue gas treatment may be the interferences by sulfur dioxide, oxygen, and dust in flue gases.
These problems are discussed in this paper.View full abstractDownload PDF (894K) -
Influence of Combustion ConditionsKatsuya Nagata, Masahiko Mochizuki1973 Volume 52 Issue 10 Pages 778-784
Published: October 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn this paper, thermal NOx in diffusion flame is studied using the small size apparatus similar to industrial combustion system burning gaseous fuel.
Part (I) contents the consideration about influence of some combustion conditions on NOX formation.
The main results are summarized as follows.
1) The fundamental relation between NOX emission and excess air factor is convex carve having NOX peak at some excess air factor. But this relation is varried by the mixing property of fuel and air flow in combustion chamber.
2) Increase of NOX formation as combustion air temperature is estimated numericaly through the kinetic consideration.
3) Mixing of fuel and air impacts the NOx formation. As mixing is improved, NOx Emission very reduces, follow to increase. This reason is the decrease of residence time of combustion gas in high temperature region.View full abstractDownload PDF (901K) -
Properties of Some NOx Control Techniques and Prediction Method of NOx FormationKatsuya Nagata, Masahiko Mochizuki1973 Volume 52 Issue 10 Pages 785-790
Published: October 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn part (II), using the same apparatus in part (I) the effect of some NOx reduction techniques is studied.
Practical NOx formation rate obtained through experimental results in this paper and NOx formation process is calculated by applying this rate to temperature profiles of combustion gas.
The results are as follow.
1) CO2 pre-mixing in the combustion air indicates higher NOx reduction than N2 or A. N2 pre-mixing is same to A, in spite of lower combustion temperature. Because N2 concentration is higher than A.
2) Effect of two-stage combustion is greater as mixing more improves.
3) The calculated concentration using the NOx formation rate and temperature history diagram coincides with experimental data.View full abstractDownload PDF (728K) -
Yasuo Hirose, Teruo Kannari1973 Volume 52 Issue 10 Pages 791-797
Published: October 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSAs a countermeasure for control of NOx emissions from natural draft burner, we have developed new type burner so called “Self recirculating gasification (SRG) ” burner, in which both gas recirculation and two stage combustion technique are being effectively applied by utilizing rolling up phenomenon of high velocity fluid.
To evaluate the burner characteristics, tests were conducted in a laboratory using various fuel oil such as C, B, A class heavy oil and also kerosene since these oil are containing different amount of Fuel Nitrogen, which are 0.289, 0 .180, 0.030 wt% and almost negligible, respectively. And the results were compared with those obtained by a conventional natural draft “Tandem” type burner at the identical operating conditions.
When we operated SRG burner with 30% excess air, 37% NOx reduction on C heavy oil, 30% on B oil, 18% on A oil and 15% on kerosene have been observed compared to the conventional burner.
Furtheremore, it has become clear that when higher Fuel N oil is used larger NOx reduction can be expected.
From the above, SRG burner can perform to contral Fuel NOx and, at the same time, due to the recirculation of combustion products into burner tile, it is also possible to reduce soot formation.
As a conclusion, by applying SRG burners on natural draft process heaters or similar type furnaces NOx emission could be reduced considerably without use of any additional equipments.View full abstractDownload PDF (877K) -
1973 Volume 52 Issue 10 Pages 804-809
Published: October 20, 1973
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (825K)
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