Abstract:
Solid particulate fuels are combusted with a primary oxidant stream of industrially pure oxygen and a secondary oxidant stream of industrially pure oxygen optionally mixed with a portion of recycled flue gas. The fuel is conveyed with a carrier gas of air or recycled flue gas. An oxygen concentration out of the total amount of the fuel stream and the primary and secondary oxidant streams is 40-63% by mass or 47-70% by volume.
Abstract:
A combustion system, and method. A combustor oxy-fired at high pressure delivers flue gas at pressure to a condensing means, such as a condensing heat exchanger, to produce a high temperature condensate for delivering thermal energy to an industrial process system, particularly for power generation, including a Brayton cycle, a Rankine cycle, or a binary fluid cycle system such as a Kalina cycle, and in particular as a bottoming cycle for an organic Rankine cycle. The combustor can concurrently provide direct heat to a secondary system, including a Brayton cycle system, a Rankine cycle system, and a binary fluid cycle system such as a Kalina cycle, without requiring significant modifications to the secondary system. The system and method provide for efficient and advantageous use of the higher temperature condensate produced.
Abstract:
The present invention relates to a combustion method, wherein a burner is used, which contains one or more tubular, semi-permeable burner membranes laid parallel, whereby the fuel is introduced into the combustion space formed of the membranes, and both the oxygen and the nitrogen of the combustion air, in ionized form, are transported through the membrane into the combustion space without the assistance of a compressor, whereby the fuel is reacted with the oxygen of the combustion air. The present invention also relates to such a burner containing one or more tubular semi-permeable membranes.
Abstract:
The present disclosure relates to a method of milling a fuel for an oxy-fuel combustion burner (9), the method comprising: separating air into a hot nitrogen gas stream, having a temperature of at least 150°C and a purity of at least 98 mol-% nitrogen, and an oxygen gas stream; leading at least a part of the nitrogen gas stream to a fuel mill (2); milling the fuel by means of the fuel mill (2) in a nitrogen rich atmosphere formed by means of the nitrogen gas stream; leading the at least a part of the nitrogen gas stream away from the milled fuel; leading the oxygen gas stream to the oxy-fuel combustion burner (9); conveying the milled fuel to the oxy-fuel combustion burner (9); and burning the fuel, by means of the oxy-fuel combustion burner (9), in an oxygen rich atmosphere formed by means of the oxygen gas stream. The present disclosure further relates to a system for milling a fuel for an oxy-fuel combustion burner as well as to a power plant comprising such a system.
Abstract:
According to an embodiment, a method of operating an oxy/fuel system and an oxy/fuel system circulate a support gas in the combustion system prior to activating at least one burner, produce the combustion fluid including CO2, wherein a level of the CO2 in the combustion fluid increases as a function of time, and continue production of the combustion fluid to exceed a predetermined level of the CO2 in the combustion fluid, for a period of time, the predetermined level being sufficient to permit the CO2 to be purified by a CO2 purification unit.
Abstract:
본 발명은 석탄가스화복합발전(IGCC)용 플라즈마 가스화기에 관한 것이다. 본 발명의 일 실시예에 따른 석탄가스화복합발전에 사용되는 플라즈마 가스화기는, 하나 이상의 플라즈마 발생장치를 포함하며, 상기 플라즈마 발생장치는 소정 주파수의 전자파를 발진하는 전자파 공급부, 상기 전자파 공급부로부터 공급된 상기 전자파 및 스팀과 산소의 혼합가스로부터 플라즈마가 발생되는 방전관, 상기 방전관에 스팀과 산소의 혼합가스를 소용돌이 형태로 주입하는 가스 공급부, 상기 방전관 내부에서 생성된 상기 플라즈마에 고체 형태의 석탄을 공급하는 석탄 공급부, 상기 방전관 내부에 플라즈마 발생을 위한 초기 전자를 공급하는 점화부 및 상기 방전관에서 생성된 플라즈마와 석탄의 반응으로부터 합성된 합성가스를 배출하는 가스 배출부를 포함한다.
Abstract:
A combustor apparatus is provided, comprising a mixing arrangement for mixing a carbonaceous fuel with enriched oxygen and a working fluid to form a fuel mixture. A combustion chamber is at least partially defined by a porous perimetric transpiration member, at least partially surrounded by a pressure containment member. The combustion chamber has longitudinally spaced apart inlet and outlet portions. The fuel mixture is received by the inlet portion for combustion within the combustion chamber at a combustion temperature to form a combustion product. The combustion chamber further directs the combustion product longitudinally toward the outlet portion. The porous transpiration member is configured to substantially uniformly direct a transpiration substance therethrough, about the perimeter thereof defining the combustion chamber and longitudinally between the inlet and outlet portions, toward the combustion chamber for buffering interaction between the combustion product and the porous transpiration member. Associated systems are also provided.
Abstract:
A method of controlling a boiler plant during a switchover period from an air- combustion mode to an oxygen-combustion mode. The method includes steps of feeding fuel into a furnace of the boiler plant at a rate determined by a fuel feeding scheme, feeding air into the furnace at a rate determined by a descending air feeding scheme, feeding substantially pure oxygen into the furnace at a rate determined by an ascending oxygen feeding scheme, and recirculating flue gas into the furnace at a rate determined by an ascending flue gas recirculating scheme. The fuel feeding scheme, the air feeding scheme and the oxygen feeding scheme are such that the fuel is combusted and the flue gas containing residual oxygen is produced. Also, the fuel feeding scheme, the air feeding scheme and the oxygen feeding scheme are such that the content of residual oxygen in the flue gas is, during at least a portion of the switchover period, greater than during any of the air-combustion mode and the oxygen-combustion mode. The method makes it possible to reduce CO 2 emissions and O 2 consumption quickly during the short switchover period.