Abstract:
Disclosed is a combustion method in which heated flue gas heats a regenerator (100) through which a mixture of fuel and flue gas containing NOx is passed to undergo endothermic reactions that produce syngas and destroy NOx.
Abstract:
A combustion system for operational connection to an energy conversion system and a method of providing thermal energy to the energy conversion system. The system comprises a combustor to be oxy-fired at above atmospheric pressure, using solid, liquid or gaseous fuels, with a supply of oxygen and supercritical carbon dioxide. The combustion gases from the combustor are delivered to a heat exchanger which interfaces with the energy conversion system. Temperatures in the combustor, and the delivery temperature to the heat exchanger, are controlled by selective recirculation of at least part of the combustion gases to the combustor, and by modulating the supply of oxygen and fuel to the combustor. Any combustion gases which are not recirculated are processed to separate carbon dioxide for use or sequestration. The system and method substantially eliminate emissions of carbon dioxide, while providing a highly efficient supply of thermal energy to the energy conversion system.
Abstract:
An air- fired combustion unit such as a utility boiler is converted to oxy- fired operation and a second oxy- fired combustion unit is operatively connected upstream so that its flue gas is fed into the combustion chamber of the first unit.
Abstract:
A premix burner arrangement for safely oxygen-enriching a premix air-fuel combustion system is disclosed. In the disclosed burner arrangement, a first conduit is arranged and disposed to provide a first gas stream. The first gas stream is a self-reactive or self- flammable premixture comprising air and a combustible gas. At least one second conduit is arranged and disposed to provide a second gas stream circumferentially around the first gas stream. The second gas stream includes oxygen. The premix burner arrangement is configured to combust or react the first stream at a temperature at least 1000° F greater than the temperature of the second stream. A method and combustion system including the premix burner arrangement are also disclosed.
Abstract:
A method of controlling a process of generating power in a power plant with a boiler by combusting carbonaceous fuel with substantially pure oxygen. At full load conditions, the method includes introducing a first carbonaceous fuel feed stream into a furnace, introducing a first substantially pure oxygen feed stream into the furnace for combusting the first carbonaceous fuel feed stream with the oxygen, and recirculating a portion of the exhaust gas discharged from the furnace at a first recirculation flow rate to the furnace, to form, together with the first substantially pure oxygen feed stream, a first inlet gas stream having a predetermined average oxygen content, thereby discharging exhaust gas from the furnace at a first discharge flow rate. In second load conditions, corresponding to at most 90% load, the method includes introducing a second carbonaceous fuel feed stream into the furnace, introducing a second substantially pure oxygen feed stream into the furnace for combusting the second carbonaceous fuel feed stream with the oxygen, and recirculating a portion of the exhaust gas discharged from the furnace at a second recirculation flow rate to the furnace, to form, together with the second substantially pure oxygen feed stream, a second inlet gas stream, so as to discharge exhaust gas from the furnace at a second discharge flow rate, and controlling the second recirculation flow rate to be from the first recirculation flow rate to a value providing the second discharge flow rate to be substantially as high as the first discharge flow rate.
Abstract:
Systems and methods for exhaust gas recirculation in which at least a desired effective oxygen concentration is maintained for stable combustion at increased recirculation rates. Oxygen-enriched gas is injected into the recirculated exhaust gas to achieve the desired effective oxygen concentration.
Abstract:
NOx emissions from combustion are reduced, NOx reduction efficiency by SNCR is improved, and other efficiencies are realized, by injecting oxygen into a fuel-rich combustion zone (10) under controlled conditions.
Abstract:
The object of the invention is a method for environmentally friendly utilization of lean gases, so that lean gases could be burnt better than before like natural gas in gas-engines, gas-turbines and gas-burners. The invention relates to a method for environmentally-friendly utilization of lean gases, so that lean gases are burnt in a burning area with the addition of air, which is characterized by that a lean (7-24 MJ/Nm ) gas mixture is burnt with air with higher oxygen content than environmental air (20.95 %). In a preferable application of the method according to the invention in case of gas-engine, or gas-turbine or gas-burner a gas-mixture of low calorific value is burnt with air of 22-36 % oxygen content.
Abstract:
The object of the invention is a method for environmentally friendly utilization of lean gases, so that lean gases could be burnt better than before like natural gas in gas-engines, gas-turbines and gas-burners. The invention relates to a method for environmentally-friendly utilization of lean gases, so that lean gases are burnt in a burning area with the addition of air, which is characterized by that a lean (7-24 MJ/Nm 3 ) gas mixture is burnt with air with higher oxygen content than environmental air (20.95 %). In a preferable application of the method according to the invention in case of gas-engine, or gas-turbine or gas-burner a gas-mixture of low calorific value is burnt with air of 22-36 % oxygen content.
Abstract:
A steam-generating coumbustion system includes an oxygen enriched gas provided as at least part of an oxidant stream. A combustionchamber receives and combusts a fuel in the oxidant stream and generate stea. The combustion chamber generates flue gas having a lfue gas volume which is smaller than a volume of flue gas generated by the combustion chamber when operated with air as the oxidant stream. A flue gas pollutant control system receives the flue gas from the combustion chamber and reduces at least one of particulate matter, SO x NO x and mercury. The reduction in flue gasvolume allows the implementation of much smaller pollutant control equipment, since the size of the pollutant control units is mainly based on the volume or mass flow rate of flue gas to be treated. Moreover, the system including oxygen-enriched gas in the oxidant will lead to concentrated levels of the pollutants in the flue gas. The high concentrations of pollutants will enhance their absorption in the different pollutant control systems, improving removal efficiency for all species.
Abstract translation:蒸汽发生的共同系统包括作为氧化剂流的至少一部分提供的富氧气体。 燃烧室接收并燃烧氧化剂流中的燃料并产生炉渣。 燃烧室产生烟气,其烟气体积小于当用空气作为氧化剂流操作时由燃烧室产生的烟道气体积。 烟道气体污染物控制系统接收来自燃烧室的烟气,并且减少至少一种颗粒物质,SO> x x <和汞。 烟气体积的减少允许实施更小的污染物控制设备,因为污染物控制单元的尺寸主要基于待处理的烟道气体积或质量流量。 此外,包括氧化剂中的富氧气体的系统将导致烟道气中的污染物的浓度水平。 高浓度污染物将增强其在不同污染物控制系统中的吸收,提高所有物种的去除效率。