摘要:
PROBLEM TO BE SOLVED: To prevent the damage of equipment such as a heat transfer tube of an exhaust heat recovery boiler by properly limiting the amount of fuel supplied to combustion assisting devices of the exhaust heat recovery boiler according to an operating state of a gas turbine.SOLUTION: The exhaust heat recovery boiler includes the combustion assisting devices 50, 52 for heating exhaust gas upstream of one of heat exchangers, and a fuel supply system for supplying fuel to the combustion assisting devices. In order to avoid the damage of the heat transfer tube by high temperature exhaust gas, an index value for limiting the amount of fuel supplied to the combustion assisting devices 50, 52 is set, and the amount of fuel supplied to the combustion assisting devices 50, 52 is limited so as to not exceed the limit of the index value.
摘要:
A module based oxy-fuel boiler system comprising a first boiler (112) configured as a main boiler and a second boiler (216) configured as a reheat boiler, said first boiler including: plurality of first boiler tubes (T) for carrying water, the tubes forming at least one water wall, a feedwater inlet line (230) in flow communication with said plurality of first boiler tubes (T), said feedwater inlet line (230) configured to be connected to an external source of water, a steam outlet line (246) in flow communication with said plurality of first boiler tubes and configured to be connected to a first turbine (238), said turbine (238) having a steam outlet that is configured to be coupled to a reheat line (248) of said second boiler (216), the first boiler (212) configured to substantially prevent the introduction of air, a first boiler oxygen supply (218) for supplying oxygen having a purity of greater than 21 percent; a first boiler carbon based fuel supply (220) for supplying a carbon based fuel; at least one first boiler oxy-fuel burner system (222) coupled to said first boiler oxygen supply (218) and said first boiler carbon based supply (220), the first boiler oxy-fuel burner system (222) configured to feed the oxygen and the carbon based fuel into the first boiler (212) in a near stoichiometric proportion to one another to limit an excess of either the oxygen or the carbon-based fuel to a predetermined tolerance, a first boiler flue gas exit line (213) for discharging exhaust gas generated as a result of the combustion in said first boiler (212), wherein the first boiler tubes (T) are configured for direct, radiant energy exposure for energy transfer to the water to produce steam; a second boiler (216) having a a reheat inlet line (248) in flow communication with the steam outlet of said turbine (238); a reheat steam outlet line (250) in flow communication with a second turbine (240), a second boiler flue gas exit line (217) for discharging exhaust gas generated as a result of the combustion in said second boiler (216), wherein the second boiler(216) is configured to carry out a different energy transfer function than the first boiler (212) and is configured to substantially prevent the introduction of air; a second boiler supply (218) for supplying oxygen having a purity of greater then 21 percent; a second boiler carbon based fuel supply (20, 120) for supplying a carbon based fuel; at least one second boiler oxy-fuel burner system(226), the second boiler oxy-fuel burner system (226) configured to feed the oxygen and the carbon based fuel into the second boiler (216) in a near stoichiometric proportion to one another to limit an excess of either the oxygen or the carbon based fuel to a predetermined tolerance.
摘要:
PROBLEM TO BE SOLVED: To concentrate a dilute solution diluted by an absorber by either sunlight heat or a burning heat source and perform operation with good efficiency.SOLUTION: The sunlight heat utilized steam absorption chiller includes a regenerator 1 which uses steam generated by sunlight heat as a heat source, the absorber 6, an evaporator 5, and a condenser 4, and has a heat exchanger 10 for allowing heat exchange between a dilute solution flowing from the absorber to the regenerator and a concentrated solution flowing from the regenerator to the absorber. The chiller is provided with a means for generating steam by the burning heat source, and either the steam generated by the burning heat source or the steam generated using sunlight heat can be input as the heat source for the regenerator. The chiller is provided with a steam drain heat recovery unit 105 for allowing heat exchange between at least part of the dilute solution flowing from the absorber to the regenerator and a steam drain discharged from the regenerator to allow heat recovery from the steam drain.