The world energy demand is increasing along with the increase of population and rise of the standard of living and if this would be supplied only by the fossil fuels, much limitation will be imposed on human activities by the environmental problem.rnThe use of nuclear energy for generating electricity is now well established all over the world. Because more than 50% of the energy cunsumed in nonelectrical energy, it is important to develop methods to apply nuclear energy to the fields other than generating electricity. Since the modular high Temperature gas -cooled reactor (M-HTR) can supply high temperature energy of 700℃ to 1000℃ and possesses high level inherent safety, the M-HTR seems to be most suitable to apply the industries that need high temperature energy.rnIn Japan, JAERI is now constructing the High temperature Engineering Test Reactor (HTTR) and the new era is coming for the development and utilization of HTR.rnRecognizing that the heat utilization of HTR would mitigate problems of envi -ronment and resources and contribute the effective use and steady supply of the energy, FAPIG organized a working group named " HTR-HUC " to study the heatrnutilization of HTR in the field other than electric power generation.rnWe chose three kinds of plants to study, 1)a co-generation plant in which the existing power units supplying steam and electricity can be replaced by a nuclear plant, 2)Coal gasification plant which can accelerate the clean use of coal and contribute stable supply of the energy and preservation of the environment in the world and 3)Hydrogen production plant which can help to break off the use of the new energy carrier HYDROGEN and will release people from the dependence of fossil energy.rnIn this paper the former two plants, Co-generation chemical plant and Coal-gasification plant are focussed on. The main features of these plants are as follows. (1) Co-generation chemical plantrnA typical chemical plant in Japan was selected as the reference plant. The reactor system consists of 2 modules of HTR with the thermal output of 450MWt each and the reactor outlet temperature of 700℃. 640ton/hr of steam of 200 ℃ to 450℃ and 210MW of electricity are supplied to the chemical plant in which 1800ton/day of ammonia, 1200ton/day of methanol, 1700t/day of ammonium sulphate and so on are produced. The total heat untilization efficiency in this plant comes up to 74%.rn(2) Coal-gasification plantrnThe coal gasification/ammonia production plant was selected as the reference plant of coal gasification. The reactor system consists of 4 modules of HTR with IHX, with the thermal output of 170MWt each and the reactor outlet temperature of 950℃ . The coal is gasified by the steam gasification process u-sing fluidized bed gasification furnace with gasification temperature of 750 ℃ and the product gas is supplied to the ammonia plant of the capacity of 1700ton/day. The amount of CO_2 emission from this plant is reduced by 20% than that from current coal-gasification plant.
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