909 ジェネライト排熱投入型温水ヒーターの開発(OS-6 低炭素社会実現に向けたエネルギーシステム(2))

In order to promote the development of biogas project in cold northern rural areas, this paper introduces some details about a set of warming system compounded with biogas and the waste heat from industrial boiler's flue gas or solar energy ,which can makes the biomass fermented normally even if the weather is so cold that the reaction is slow.Facing to the problem of the unreasonable use in waste heat of industrial boiler's flue gas, the warming system provides a reasonable way to utilize.Compared with the effect of raising temperature and the heat loss in biogas system, the warming system can ensure the stable operation of the biogas project.This paper can provide a reference to the construction of supporting facilities in biogas warming system in cold northern rural areas.

The Imanta district heating plant began operation in 1974 as one of the main heating plants for the Riga district heating system. Until now, it has undergone several reconstructions. First, the ordinary boiler plant with steam and hot water boilers was reconstructed to be a natural gas-fueled combined cycle cogeneration plant supported with hot water boilers. Then, one of the cooling towers of the cogeneration section was replaced by an absorption heat pump/chiller, thus providing the closed cooling water circulation system and recovering 2 MWth (7 MMBTU/h) low-grade heat otherwise lost in the atmosphere. The driving force for the absorption heat pump is steam produced by the steam boiler (3 MWth = 10 MMBTU/h) already located at the boiler plant. The efficiency of the absorption heat pump is closely related to the operation of the cogeneration unit, outside temperature, and district heating water temperature regimes. The case study confirms that a more efficient energy production system reduces the fuel consumption with the same amount of the produced energy, thus lowering the expenses on energy production and reducing the amount of the polluting emissions into the atmosphere.

by Idaho National Laboratory to efficiently treat wastewater and consume carbon dioxide. With this research, we determined that COHO is able to capture up to 75% of a power plant’s CO2 emissions if supplying and treating the boiler water feed. The installation of COHO at a power plant will (1) reduce wastewater volumes, (2) reduce the energy costs to treat wastewater, (3) expand the capabilities of water treatment all while (4) reducing the cost of carbon capture from flue gas.