燃料協会誌
Online ISSN : 2185-226X
Print ISSN : 0369-3775
ISSN-L : 0369-3775
48 巻, 4 号
選択された号の論文の7件中1~7を表示しています
  • 戸川 嘉正
    1969 年 48 巻 4 号 p. 205-206
    発行日: 1969/04/20
    公開日: 2010/06/28
    ジャーナル フリー
  • 近藤 希賢
    1969 年 48 巻 4 号 p. 207-215
    発行日: 1969/04/20
    公開日: 2010/06/28
    ジャーナル フリー
    General description on the burning process of cement clinker especially on the kiln with suspension preheater system and wetlong kiln are given briefly.
    The most important point in the buning process is to reduce heat consumption and it can be achieved by improving the mechanism of heat enchange between gas and material. The heat consumption of the kiln with suspension preheater is about 40% less than that of wet long kiln.
    Nearly all of the sulphur coming from raw material and fuel oil is fixed to the clinker as CaSO4 so SO2 content in the exit is very low. The behaviour of sulphur circulation inside the kiln and preheater is also reported.
  • 配合コークスの反応性
    樫野 泰三, 和佐 昭, 横山 徹, 松井 稔
    1969 年 48 巻 4 号 p. 216-225
    発行日: 1969/04/20
    公開日: 2010/06/28
    ジャーナル フリー
    Reactivities of many different cokes produced from coal blend by 1 kg test retort or 330kg test oven have been measured using the method which was illustrated at previous report, and next results have been obtained.
    (1) Reactivity of coke from coal blend can be predicted relatively by the reactivities from unblended coals which compose the blend, but the reactivity from coal blend does not correspond to that calculated on the basis of additivity.
    (2) Adding coal tar pitch to unblended coal or coal blend, coke reactivity becomes low, and the effect of it is especially good at a little addition.
    (3) The effect of oil coke to coke reactivity is complicated. Blending green oil coke to unblended coal or coal blend, the reactivities of cokes produced from some blends have a minimum value at a little blending rate (about 5%) of green oil coke, but those from other blends have not such a phenomenon.
    (4) Correlation coke reactivity and microstrength is found with cokes produced from similar coal blend. But the correlation becomes doubtful with cokes produced from coal blend in which coal tar pitch or green oil coke is blended.
    (5) Correlation between reactivity of fine coke and apparent specific gravity or porosity of lump coke is found only with the cokes produced from similar coal blend at equal carbonization temperature. That is, macroscopic property of lump coke effects to reactivity of fine coke to some extent.
  • 西野 浩, 武田 詔平
    1969 年 48 巻 4 号 p. 226-234
    発行日: 1969/04/20
    公開日: 2010/06/28
    ジャーナル フリー
    In order to establish the manufacturing process of smokeless domestic fuel from Japanese fine coals of weakly caking property, their heat treatments at 400-475°C with a fluidized bed, followed by direct briquetting of hot chars formed, were fundamentally studied.
    The reactor, made of refractory glass, was heated up by external electric heater at the selected temperature.
    In each batch, 35g of fine coal was heat treated in the reactor and char obtained was fed to the mould and compressed with an oil press.
    Results of the tests on several factors affecting on briquettability of char were as follows:
    (a) When weakly caking coals of free swelling number ranging from 3 to 61/2 were used, they gave briquettes of high compression strength.
    (b) The properties of briquettes were good, when the range of heat treatment temperature was between 425°C and 450°C, and also when the temperature of mould was maintained above 350°C.
    (c) In general, reducing the oxygen content in the fluidizing was, the strength of briquettes increased.
    But for higher rank coals used, when the oxygen content was reduced extremely, the blockage was observed in the reactor due to agglomeration of coal particles.
    (d) The volatile matter of char was from 25% to 35% (d. a. f.).
  • 石炭の微細孔隙構造の研究
    畑見 正男, 戸田 雄三, 吉田 雄次
    1969 年 48 巻 4 号 p. 235-240
    発行日: 1969/04/20
    公開日: 2010/06/28
    ジャーナル フリー
    The experiment of CO2 adsorption on twelve kinds of Japanese coals and five kinds of foreign coals was carried out and the applicability of Dubinin's theory of micro-pore volume filling was examined. The results were satisfactory.
    The isosteric differential heat of adsorption evaluated from the characteristic curve was almost constant over the whole rank.
    The evaluation of surface area was also made by Marsh's method. The plot of the surface areas of Japanese coals against C% showed a concave curve with a minimum at about 85%C and was somewhat smaller than that of foreign coals obtained by Marsh.
    The rate of adsorption of CO2 on coals was usually slow and different in rank. The relative adsorption values (Vt/V∞) at adsorption time 1, 800sec were plotted against C%. The Vt/V∞ value increased with rank and had a maximum at about 85%C. This shape of curve was also observed in the plot of the gradient of rectilinear characteristic curve against C%.
    In conclusion, the average pore diameter is small in low rank coals and, with the increase of coal rank, it increases and has a maximum of about 85%C and then decreases. On the contrary, the variation of the surface area with rank was entirely opposite to that of the average pore diameter.
  • 喜多 信之, 布施 芳哉
    1969 年 48 巻 4 号 p. 241-250
    発行日: 1969/04/20
    公開日: 2010/06/28
    ジャーナル フリー
    The control of nitrogen oxides by exhaust recirculation, intake throttling and injection timing has been investigated experimentally on small type high speed diesel engine, while power out put, smoke contamination and carbon monooxide concentration have been measured at the same time.
    Based on the results of these tests, the author concludes with recomendation concerning choice of operation conditions to ensure a minimum discharge of nitrogen oxides.
  • 1969 年 48 巻 4 号 p. 254-257
    発行日: 1969/04/20
    公開日: 2010/06/28
    ジャーナル フリー
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