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Volume 57, Issue 6
Displaying 1-7 of 7 articles from this issue
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[in Japanese]1978 Volume 57 Issue 6 Pages 383
Published: June 20, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (224K) -
Yoshiaki MIURA1978 Volume 57 Issue 6 Pages 384-398
Published: June 20, 1978
Released on J-STAGE: October 21, 2011
JOURNAL FREE ACCESSChanges in the coal belnding theory, which is a basic condition for the manufacture of blast furnace coke, are comprehensively considered.
Both rank and caking property parameters, founded on the basic concept on coal blending, has been used in the determination of coal blending in practice. Five couples of rank and caking property parameters are analyzed and compared. As a result, it was revealed that the relative positions of each coal group and charged coal for chamber oven are approximately constant, on the axis of co-ordinates of rank and caking property parameters. Therefore, the selection of the method for determining the blending standard is the one of the measuring procedure for the para-meters.
At the end the author considered the character of each blending parameter. In future we will have to cope with the new conditions of the enlargement in coal sour-ces, development of new coke making processes and clarification of coke property under heat. For this purpose it was suggested that the texture and constitution of coal, caking property under heat and the texture and constitution of coke should be clarified.View full abstractDownload PDF (1952K) -
Masayoshi SADAKATA1978 Volume 57 Issue 6 Pages 399-407
Published: June 20, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA low excess air combustion technics was reviewed on the basis of previous works from the point of view of an economical usage of fuel and the control of pollutants emission. The contents were summarized as follows.
(1) Emissions of fuel NOx and SO3 can be reduced by the low excess air combustion whilst an emission of thermal NO from nearly premixed flame can not be controlled only by the decrease of an excess air.
(2) An improvement of the mixing of fuel and air is inevitable to control emissions of unburnt species such as CO, H2 and soots under the low excess air condition. The basic principle for the improvement of mixing on the basis of turbulent mixing mechanism was presented.
(3) The development of air ratio control system which can follow quickly to an unpredictable disturbance to maintain the initially fixed air ratio is required for the completion of low excess air combustion techniques. The new control system which applies the spectroscopic characteristics of flame was introduced as an example.View full abstractDownload PDF (1175K) -
[in Japanese], [in Japanese]1978 Volume 57 Issue 6 Pages 408-411
Published: June 20, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (674K) -
Pilot-Plant ExperimentYuusai YAMAHATA, Kazuhiko OHI, Tamotsu TAKEBAYASHI, Katsumi MASE1978 Volume 57 Issue 6 Pages 412-418
Published: June 20, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSExperiments were carried out in order to reduce NOx emission with a 600mmφ/900mmφ sectioned fluidized bed sewage sludge incinerator based on Raschka's technique in West Germany. This paper presents the effects of the staged combustion technique for NOx reduction applied to the fluidized bed incinerator. In the operation, the fluidized bed was maintained at the less-stoichiometric condition and the rest of the combustion air, the secondary air, was introduced into the free-board.
We examined four kinds of the injection method of the secondary air. First one is no secondary air. Second one is the single staged injection just above the bed. Third one is the uniform supply from the five staged nozzles, and last one is the delayed injection from upper three nozzles attached to the freeboard.
The experimental results showed that the NOx emission was appreciably reduced by applying the multi-staged injection of the secondary air in comparison with both the no-injection and the single stage which are the conventional operation.
Especially, the three staged injection method is the most effctive, and makes NOx emission less than 60ppm.View full abstractDownload PDF (840K) -
Fuel Oil Additive Committee, The Fuel Society of J1978 Volume 57 Issue 6 Pages 419-424
Published: June 20, 1978
Released on J-STAGE: February 23, 2011
JOURNAL FREE ACCESSAs a first step to study the low temperature flow properties of some residual fuels and to investigate the measurement of the efficacy by flow impro-vers, a comparative test was conducted with two methods of the CFPP and the JIS.
From some experimental results, the following conclusions were obtained.
(1) It is possible to estimate the CEPP as a testing method for gas oil and diesel oil mixed with flow improvers.
(2) In order to establish the CEPP as a formal testing method, many very strict restrictions must be obeyed for the accuracy of the measurement and some factors that affect to the low temperature flow properties of fuels.
(3) As the flow improvers have the optimum mixing weight for improving the low temperature flow properties respectively, in case of comparing the efficacies by them, it mustikbe considered that.View full abstractDownload PDF (737K) -
Tsuyoshi OGAWA1978 Volume 57 Issue 6 Pages 425-429
Published: June 20, 1978
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe researches on identification of discharged oil into the sea were carried out with the analysis of nitrogen contents in petroleum and the ratio of sulphur/nitrogen.
From the results, it was proved that: -
(1) Analysis of nitrogen contents in oil may be able to identify the productionzone of imported crude Oil
(2) Nitrogen contents of oil and the ratio of sulphur/nitrogen were little changed in weathering.
(3) At the discharge accidents of oil into the sea, it may be applied to identify a kinds of discharged oil with nitrogen contents and sulphun/nitrogen ratio.View full abstractDownload PDF (486K)
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