巻号一覧
後続誌
69 巻, 2 号
選択された号の論文の13件中1～13を表示しています
- |<
- <
- 1
- >
- >|
-
中島 泰夫1990 年 69 巻 2 号 p. 75
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (204K) -
宮崎 正信1990 年 69 巻 2 号 p. 76-83
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーThis report describes the current state of air quality and its trends, countermeasures.
Nowadays, in environment, sulfer dioxide is keeping good condition, but nitrogen dioxide, suspended particulate matter and oxidants are far from desirable level.
There are many reason to this environmental air pollution, but the biggest problem to solve is automobiles.
Owing to the rapid growth of the traffic of certain types that emit larger amounts of nitrogen oxides, the amount of automobile exhaust has not been decreased significantly.
So we have to make up new regulation, especially for automobiles to achieve the Environmental Quality Standard.抄録全体を表示PDF形式でダウンロード (855K) -
野口 嘉一1990 年 69 巻 2 号 p. 84-91
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーIn Japan, combustion modification and SCR process are widely applied for NO control in thermal power plants. By combustion modification, 50-70% of NOx can be reduced to 40-60 ppm for gas-fired, 80-120ppm for oil-fired and 150-200ppm for coal-fired boilers. Recently, in-furnace NOx reduction techniques such as IFR, three-stage combustion are also developed. When further NOx reduction is needed, flue gas treatment technologies such as SCR should be used. Simultaneous SO2 and NOx control processes using activated char or electron beam being developed for cost reduction. NOx control technologies may become more important in many countries to solve acid rain problem.抄録全体を表示PDF形式でダウンロード (910K) -
大井 明彦1990 年 69 巻 2 号 p. 92-99
発行日: 1990/02/20
公開日: 2011/02/23
ジャーナル フリーAtmospheric environment has been improved in Japan, but compliance rate with the environmental quality standards for nitrogen dioxides has remained at insufficient level. Diesel-powered automobiles are identified as primary emission source of nitrogen dioxides. It is desired that emission standards for diesel-powered automobiles are reinforced.
In this paper, present technical levels and problems were described for NOx control, particularly concerning with engine modification (EM) and exhaust gas recirculation (EGR) techniques, which have been mainly adopted by automobile manufacturers. So far the manufacturers have applied fuel injection timing retard out of EM techniques, but further remarkable improvement of this technique is not expected, so that the application of EGR technique is being studied. Because the durability of many parts in the engine are deteriorated by means of EGR application, the improvement of lubricating oil grade and reduction of sulfur content in gas oil are desired in addition to the improvement of the quality of material in the engine.抄録全体を表示PDF形式でダウンロード (940K) -
永井 建夫, 川上 雅由1990 年 69 巻 2 号 p. 100-106
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーThe authors systematically conducted experiments for determining the present levels of NOx emission from small-size, high-speed to medium-size, medium-speed diesel engines. The effects of various control factors on NOx emission were investigated through experiments and simulating calculations on the engines to find the factors that lower NOx levels.
As a result, it has been found that the reduction in NOx without degrading the specific fuel consumption not so much can be achieved by injection timing retarding and properly increasing the compression ratio and air boost pressure to maintain the Pmax, which decreased by timing retarding, of the design point.
Furthermore, it has been found that the influences of ambient conditions such as ambient temperature, humidity and intake air temperature have to be taken into account for evaluating NOx. And nitrogen content in fuel is also needed to take into account.抄録全体を表示PDF形式でダウンロード (1538K) -
飯田 弘文1990 年 69 巻 2 号 p. 107-111
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーFollowing is the description of next items.
1. Trend of cogeneration in Japan.
2. Current regulatory trend on NOxin Japan.
3. NOx reduction technology of gas engines.
(1) Three way catalyst.
(2) Lean combustion.
4. NOx reduction technology of gas turbines.
(1) Water injection.
(2) Steam injection.
(3) Premixed lean combustor.
(4) Selective catalystic reduction by NH3.抄録全体を表示PDF形式でダウンロード (492K) -
原田 英一, 藤井 健一1990 年 69 巻 2 号 p. 112-117
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーWe need the low-NOx coal combustion system for small boilers. However, conventional methods of low-NOx coal combustion are not effective in small boilers because of the very high combustion rate.
We therfore developed new-low-NOx and low-carbon in flyash coal combustion system for small compact boilers using the Coal Partial Combustor technologies.
This technologies are based on NOx-decomposition with high temperature atmospheres under fuel-rich conditions.
In this paper, the new-low-NOx coal combustion technology for compact coal combustion boilers and the results of combustion tests are reported.抄録全体を表示PDF形式でダウンロード (692K) -
石川 芳治1990 年 69 巻 2 号 p. 118-121
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーThis paper describes control measures for effective combustion process due to low NOx combustion in gas burning boiler.
Measures of process are
(1) Low NOx burner combustion.(2) Exhaust gas recirculating combustion.
Low NOx burner has three (3) types of burner.
(a) Ceramic burner made of ceramics.
(b) Cyrindrical type burner made of metallic perforated plate.
(c) Thin flame combustion burner utilizing gas blowing speed.
Ceramic burner has a premix chamber, and spraied gas from small holes of ceramic spraying plate to form short & dispersed flame.
Cylindrical burner has also premix chamber to make good effect, and spraied gas from small holes of end metallic plate, which enables spraied gas to form short & dispersed flame.
Thin flame (combustion) burner utilies blowing speed of gas to form hollow conical flame, in addition to involving effect of blowing gas at central part.
Exhaust gas circulating combustion enables low combustion temperature by mixing part of exhaust gas and combustion air, and is effective for low NOx combustion.抄録全体を表示PDF形式でダウンロード (429K) -
糸川 英樹1990 年 69 巻 2 号 p. 122-125
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーThis paper describes the production of NOx by oil burning and the method of decreasing NOx.
Tokyo Metropolis enforced the recognition system to NOx apparatus.-commercial boilers, generating low NOx, that is lower than 80ppm (O2=0%) for oil burning.
The concentration of NOx is influenced by a kind of fuel, the structure of boilers and burners.
Now most of boilers are need the countermeasure of low NOx.There are three method of decreasing NOx in small boilers.
(1) Recircuration of combustion waste gas.
(2) Burner with water spray.
(3) Self recircuration burner.抄録全体を表示PDF形式でダウンロード (422K) -
西 徹, 原口 博, 奥原 捷晃1990 年 69 巻 2 号 p. 126-133
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーIt is very important to clarify the deterioration mechanism of coke at the lower part of blast furnace. In this study, the deterioration of coke, which was caused by the interaction of carbon and ash during heat treatment to 2000°C in a nitrogen atmosphere, was investigated.
The following findings were obtained.
(1) After the coke heated up to 2000°C, the weight of coke decreased by approximately 12%. The coke strength decreased with decreasing the weight of coke, and it decreased by 0.5% per 1% of the weight loss of coke.
(2) The vaporization of the ash and the volatile matter of coke and the interaction of carbon and ash caused the weight loss of coke, and the 70% of the weight loss was caused by the interaction of carbon and ash.
(3)The interaction of coke and ash mainly consisted of the reaction where SiC was formed by the interaction of SiO2 and 3Al2O3·2SiO2 included in ash and C in the coke, but at temperature above 1750°C, N2 in the atmosphere, SiO2 and 3Al2O3·2SiO2 interacted. At temperature between 1750°C and 2000°C, SiC and AlN were formed, and the amount of these compounds in the coke reached about 3% and 2% respectively.抄録全体を表示PDF形式でダウンロード (816K) -
C/Cコンポジット早田 喜穂1990 年 69 巻 2 号 p. 134-138
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (1430K) -
吉川 惠也1990 年 69 巻 2 号 p. 144
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (209K) -
浜野 徹三1990 年 69 巻 2 号 p. 145
発行日: 1990/02/20
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (141K)
- |<
- <
- 1
- >
- >|