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SITETOP > Technical
Information > Technical Review
> VOL.18 NO.1 (published in Jun-2010)
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VOL.18 NO.1
(published in Jun-2010)
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Photo in Cover :Suita Municipal Waste Incineration
Facility
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| Trends in Crushing and Sorting, and Recycling
Facilities for Municipal Waste |
Seiji SATO*
(*Environmental Engineering Dept. Ⅱ) |
(Abstract)
The treatment technologies that were employed at the crushing and recycling
facilities for municipal waste were initially more for the crushing facilities,
consisting mainly of crushers, to help in smooth feeding of combustible bulk
refuse, such as “Tatami” straw mats, “Futon” bedding, and furniture, into the
incinerator. However, as the country has moved into the era of mass consumption
and mass disposal as a result of high economic growth, emphasis has been placed
more on sorting technologies to help in recycling and in reduction of the volume
of the waste that goes for final disposal. Furthermore, as the sorted collection
of waste progresses, with the institution of various laws and regulations
relating to recycling, disposal systems have been diversified and at the same
new disposal technologies have been introduced. Also, facilities have been built
and improved for the edification of local residents to curb the generation of
waste. This paper summarizes the changes and trends in waste-treatment
technologies, including those for crushing and sorting. |
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| Suita Municipal Waste Incineration Facility |
Takayuki ODA* and Tsuyoshi SATOH*
(*Environmental Engineering Dept. Ⅱ) |
(Abstract)
We had delivered a refuse-incineration power plant to Suita Municipal Office in
March 2010.
This refuse-incineration power plant positively recovers heat generated in
the course of incinerating refuse and then, generates electric power with the
heat. Simultaneously, by availing of the generated power, the plant melts
incineration slag and fly ash via an arc melting furnace.
After implementing trial runs for performance testing for about six
months, it was proven that both the incineration facility and the melting
facility satisfied the respective design capabilities, and further, the
exhaust-gas measured value and the molten slag leaching test value fully
satisfied the respective reference values. |
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Demonstrative Operation of an Energy-saving, Low-cost
Sludge-concentration and Dehydration
system
－A Combination of a Rotating Drum-type Thickener and a High-efficiency Screw-type Dehydrator－ |
Hirofumi YAMASHITA*, Hiroki WADA** and Ken-ichi
SHISHIDA**
(*Sewerage Bureau, Tokyo Metropolitan Government, **Sewerage Engineering Dept.) |
(Abstract)
Along with the spread and upgrading of the sewerage system, it has been desired
to develop more efficient treatment systems with due considerations to cost for
the construction of a sludge treatment facility, and its maintenance and
operation, and also to the measures for global environment protection, including
the prevention of global warming.
In the systems commonly employed for conventional sludge treatment, raw
sludge is thickened by gravity and the excess sludge, with a centrifugal
thickener. The respective types of thickened sludge are mixed and then
centrifugally dehydrated. In contrast, the writers together with others have
conducted tests for evaluation of the treatment performance of a
sludge-treatment system by considering energy saving, low cost, and space saving
to concentrate and dehydrate mixed raw sludge using a rotating drum-type
thickener and high-efficiency screw-type dehydrator (manufactured by Ishigaki
Company, Ltd.).
The test result revealed that the subject treatment system performs as or
better than the conventional systems and also that electric power and chemicals
costs can be reduced by 60-70% and Co2 emissions, by 30-50%.
Incidentally, this report presents part of the results of a joint research
program with Sewerage Bureau, Tokyo Metropolitan Government. |
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| System for Recovery of Energy from by-product Glycerin
on the Dry Methane Fermentation Process －Kyoto Bio-cycle Project－ |
Taisuke KUBORI*, Daisuke IWASAKI*, Naoki IRIE* and
Ken-ichi SHISHIDA*
(*Sewerage Engineering Dept.) |
(Abstract)
As part of the “Kyoto Bio-cycle Project”, a project of the
Ministry of the Environment for development of global warming countermeasure
technologies, testing was conducted for verification of biogas recovery from
by-product glycerin and also for check of safety of the by-product glycerin
receiving and charging system in an attempt for effective use of
glycerin-containing wastes by-produced from the BDF production process.
As a result of the continuous operation of thermophilic dry methane fermentation of mixed by-product glycerin and kitchen waste
(about 4% of by-product glycerin mixture ratio), it was confirmed that there was
1,140m3N／ton-by-product glycerin of biogas generation,
approximately the same with 1,080m3N／ton-by-product
glycerin, which had been obtained in the basic research phase. It has also been
confirmed through the laboratory and field tests that the concentration of
combustible ingredients in the volatile gas will not reach the explosion limit
when stored at 40℃ by diluting by-product glycerin twice and that thus safety
operation is possible though there may be certain variations in concentration of
by-product glycerin at the time of its receiving. |
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| Report on Installation of a RPF-fired Boiler |
Yuji FUJIWARA*, Hisaaki HIDAKA* and Keiji MUKAI*
(*Energy Engineering Dept.Ⅰ) |
(Abstract)
While the construction and operation of boilers using woody fuel and other
biomass fuels have been popular, it has been getting more difficult to secure
woody fuel because of the increase in the demand for it in recent years. RPF has
attracted attention as a substitute for these biomass fuels and also for fossil
fuels.
This paper reports the outline of the facility plan and the results of
the operation of the RPF-fired fluidized bed boiler plant that was delivered to
Kaga Paperboard Manufacturing Co., Ltd., Ishikawa Prefecture, in July 2009. The
subject plant, consisting of a RPF-fired cogeneration system, has achieved
favorable combustion state in the performance test and it has been verified that
it is capable of delivering the performance required to meet the design
specifications. Also, it is found that it clears the regulation values related
to environmental pollution, including those for effluent gas and incineration
ash. |
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| Development of Catalyst for Methanol Synthesis |
Muneharu FUJIKAWA* and Kazuhiro SATO*
(*Energy & Environment Development Dept.) |
(Abstract)
A epochal high-efficiency reactor vessel and the catalyst that is highly active
at low temperatures for methanol synthesis have been developed with a view to
establish a system for biomass gasification and methanol synthesis due to
increasing a use for a small amount of local biomass energy.
A copper／zinc catalyst, which retains a high level of activity under the
temperatures as low as 200℃ and is also highly durable, has successfully been
developed by improvements in the dispersibility of copper and thermal
conductivity of the catalyst.
As a result of the demonstration test to verify the performance of the
newly developed catalyst, the stable yields of methanol were attained and no
deterioration was observed over one month of continuous operation. |
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| Cases of Operation of the TIPLOS System (Total
Operational Support System) and Future Prospects |
Hiroyuki FUJIKAWA*, Jun-ichi TANAKA*, Katsunori
MAEKAWA**
(*Electrical & Instrumentation Dept. **Takuma System Control Co., Ltd.) |
(Abstract)
The “total operational support system (TIPLOS†)” to provide total
remote operation support services using the Internet, whose operations started
in April 2004, is connected to ten domestic refuse incineration or ash melting
plants and one overseas refuse incineration or ash melting plant, as of March
2010.
While some of the functions of the subject system were described in the
previous report (Vol.12, No.1, 2004), this issue covers cases of operation of
the system after introducing the remote monitoring and analysis／reporting
services, consisting mainly of DSC displays monitoring, ITV displays
monitoring, and alarm monitoring, and also the proposals concerning the support
to DBO projects as tasks for the future.
†TIPLOS stands for Takuma Intelligent Plant Observation System. |
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| Report on the Installation of a High-efficiency
Gas-fired City Boiler |
Hiroshi HIRAYAMA*, Yuichiro HANAYAMA* and Takayuki HATAGI*
(*Energy Engineering Dept. Ⅰ) |
(Abstract)
A variety of efforts have been made to reduce CO2 emissions for
prevention of global warming. The fuel conversion to city gas consisting mainly
of natural gas, which is the most environmentally-friendly among the fossil
fuels, is part of such efforts, and further enhancement of the efficiency of the
system is required. Against such a background, TAKUMA delivered a city gas-fired
boiler to Energy Advance Co., Ltd. to be installed within the premises at the
Ashigara Site of the Kanagawa Factory, Fujifilm Corporation.
This city gas-fired boiler is intended to replace the existing
heavy-oil-fired high-pressure high-temperature boiler at the site in order to
reduce CO2 emissions and gain energy-saving effect.
Reporting is done here about the outline of the boiler facility plan and
its features, and also about the results of its test run. |
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SITETOP > Technical
Information > Technical Review
> VOL.18 NO.1 (published in Jun-2010)
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