01740 Recycling of combustion ashes

01740 Recycling of combustion ashes

18 Energy conversion and recycling 99lO1739 Recycle method and apparatus of the treatment gas from dry desulfurizatlon apparatus 99101742 Shono, 0. ...

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18 Energy conversion and recycling 99lO1739 Recycle method and apparatus of the treatment gas from dry desulfurizatlon apparatus


Shono, 0. Jpn. Kokai Tokkyo Koho JP 10 183,145 [98 183,145] (Cl. ClOJ3/46), 14 Jul 1998, Appl. 96/350,633, 27 Dee 1996, 8 pp. (In Japanese) This paper presents a method for recycle of treatment gas after removal of SOz from a high-concentration SOz-containing gas generated from a desulfurizing agent regeneration tower. The method comprises transferring the high-concentration SOz-containing gas from the regeneration tower to the SOz absorption apparatus with an expander equipped and withdrawing a part of the treatment gas from the SOz absorption apparatus to the regeneration tower by passing it through a compressor having the same axis with the expander to increase the pressure of the treatment gas.

Wakayama, H. er al. Jpn. Kokai Tokkyo Koho JP 10 219,258 (98 219.2581 (Cl. ClOGUlO), 18 Aug 1998, Appl. 97/25,262, 7 Feb 1997, 7 pp. (In Japanese) Before thermal decomposition, alkalis are contacted with the macromolecular materials to capture the halogens. Therefore, polyvinyl chloride was heated in a 1N NaOH aqueous solution at 250°C and 39 atm for 1 hour and >95% chlorine was removed. Gas oil substitutes were achieved by heating the resulting macromolecular materials in nitrogen at 450°C.

99lQ1740 Recycling of combustion ashes Alemany, L. J. er al. Ing. Quint., 1998, 30, (344), 169-174. (In Spanish) Recycling of ashes produced by fossil fuel combustion is discussed, with three objectives: as adsorbent for organic contaminants, in aluminosilicabased catalyst supports and recovery-precipitation of vanadium as a catalytic oxide (V-P-O system) of industrial interest.

Study on the mechanism of low-temperature thermochemical conversion process for wastewater sludge


He, P. et nl. Zhon&uo Huanjing Kexue, 1998, 18, (1). 39-42. (In Chinese) A newly developing technology is the low-temperature thermochemical conversion process for sewage sludge, through which the energy can be recovered. The elements transfer, specified transfer temperature and reaction mechanism about the transfer reaction of the conversion process are discussed with the help of elemental composition analysis for sewage sludge and transfered products, thermogravimetric analysis for sewage sludge and GUMS analysis for derived oil. The main conversion reactions are the evaporation of aliphatic compounds, the fission of protein peptide bonds and the group transfer reaction. The main compositions involved in the conversion reaction are aliphatic compounds and proteins, with higher reaction temperatures for the former, lower for the latter and the highest for the saccharide compounds.

Thermal decomposition of halogen-containing macromolecular materials for recycling as fuel substitutes

99lO1743 Waste tires fuel oilfield cement manufacture Caveny, B. et al. Proc. ht. Conf. Gem. Microsc., 1998, (20), 232-245. In this paper, a case history of Capitol Cement’s successful use of waste automobile and truck tyres as a cement kiln fuel to supplement the natural gas, coal and coke traditionally used as fuels in the manufacture of oilfield cements is presented. Other cement-manufacturing plants have been unsuccessful in their attempts to burn tyres in oil-field-cement manufacture, producing cement with properties that did not allow the cement to be used in oilfield applications. For many years tyres have been used in the manufacture of construction cement. The following topics are presented: (1) using microscopy to ensure proper crystal formation, size and homogeneity; (2) using microscopy to ensure a clean burn; (3) ensuring that no damage to the environment occurs as a result of tyre burning; (4) addressing the public relations aspects of burning tyres in an urban cement plant; (5) managing the logistics of handling the tyres and feeding the kiln; (6) comparing the performance of tyre-burn cement with the performance of conventionally fired cement; (7) analysing the geology of the quarry furnishing the raw materials; (8) addressing economic issues. This paper also presents photographic and graphic illustrations of key processes.


Waste treatment and energy recovery

Murata, T. Gekkun Haikibursu, 1998, 24, (4) 118-121. (In Japanese) This paper presents a review of technology of energy recovery from waste treatment, including power generation from waste incineration, biogas manufacturing and methane-related fuel cells.

Fuel and Energy Abstracts

March 1999