摘要:
There is disclosed a method of generating superheated steam for use in power generation. The method comprises: (a) preheating feed water to a temperature below its boiling point; (b) boiling the preheated feed water to produce steam; and (c) superheating the steam. The feed water is boiled by heat exchange with a heat transfer fluid which has been heated by heat collected in a first solar radiation absorption device. In addition, one or other or both of the preheating and superheating is carried out by direct heating in a further solar radiation absorption device or devices. The invention also relates to an apparatus for generating superheated steam for use in power generation. The apparatus comprises: (1)a superheated steam generating portion for generating superheated steam, comprising: (a)a preheater zone for preheating a feed water to a temperature below its boiling point; (b)a boiler zone downstream of the preheater zone for boiling the preheated feed water to produce steam; and (c)a superheater zone downstream of the boiler zone, for superheating the steam; and (2)a heat transfer fluid portion comprising a first solar radiation absorption device for heating a heat transfer fluid and being configured to transfer heat from the heated heat transfer fluid to the feed water in the boiler zone. One or other of the preheater zone and the superheater zone comprises a further solar radiation absorption device for direct heating of the feed water or the steam, or wherein each of the preheater zone and the superheater zone comprises a further solar radiation absorption device for direct heating respectively of the feed water and the steam.
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:
Corrosion is avoided by using an external superheater heated by the clean gas exhaust coming from the internal combustion machine (ICM) mixed with pure air, with duct firing to adjust the steam superheating temperature, in the same way the existing natural gas/waste power plant do. The difference in the proposed patent is that the ICM is chosen not to match the steam amount produced in the waste boiler, which is superheated to a corrosion safe temperature say 400 C or less, but just to provide the plant own power consumption. We need to increase this ICM exhaust flow with pure air and use duct firing (11,12) to raise the gas mixture temperature, say between 600 C and 700 C, high enough to superheat the steam in the external superheater (3) to approximately 500 C. If we use pure air at ambient temperature, the amount of natural gas in the duct burners (11,12) will be very high decreasing the natural gas efficiency. To reduce the natural gas consumption in the duct burner (11,12) we use the hot gas leaving the external superheater (3), around 420 C, to preheat the ambient air to say 390 C, in a air/gas heat exchanger (13), before it is mixed with the ICM exhaust, increasing the mixture temperature to a value close to 400 C, reducing drastically the natural gas consumption in the duct firing (11,12).
摘要:
Provided is a reheat boiler in which the imbalance in temperature distribution of the temperature of the combustion gas at the outlet of a reheat furnace is reduced by changing the gas flow pattern in the reheat burner. A reheat boiler (10A) includes a main boiler (106) configured such that main combustion gas generated in combustion in a burner (101) flows from a furnace (102) through a superheater (104) and evaporator tubes (105), a reheat furnace (108) that is disposed on the downstream of the evaporator tubes (105) and produces reheat combustion gas by combustion in a reheat burner (107), and a reheater (109) disposed above the reheat furnace (108). A closing plate (130), serving as a drift preventing portion, is provided at a reheat furnace outlet (120) that connects the reheat furnace (108) and the reheater (109) to form a flow path for the combustion gas and the reheat combustion gas so as to narrow the cross-sectional area of the flow path for the combustion gas.
摘要:
In a heat pump system including a water purifier (1) and an evaporator (2) for evaporating feed-water (10) to produce steam (12), water (11) used for spray cooling is effectively used and productivity of purified water used for the spray cooling is increased. Discharged water (21) from the water purifier (1) is supplied to the evaporator (2) when water used for spray cooling is produced by use of the water purifier (1). Otherwise, drain (22) of the evaporator (2) having higher temperature is supplied to the water purifier (1) by using such a fact that in a reverse osmosis membrane type water purifier (1), the higher the temperature of feed-water (10) is, the higher the purified water productivity becomes.
摘要:
The invention relates to a method and a device for generation of superheated steam. According to the invention, essentially saturated or wet steam is generated in a main plant in which a superheating is technically not possible or to limited degree, said steam is then superheated in an auxiliary plant, the superheater of the auxiliary plant being regulated depending on the steam production from the main plant.