초록 ▼

This invention discloses the synergistic integration of solid fuel combustion, low NOx control technologies (such as Low NOx Burners, reburning and Advanced Reburning) with partial in-duct gasification of coal or other solid fuels. For partial gasification, the solid fuel can be transported and inje

This invention discloses the synergistic integration of solid fuel combustion, low NOx control technologies (such as Low NOx Burners, reburning and Advanced Reburning) with partial in-duct gasification of coal or other solid fuels. For partial gasification, the solid fuel can be transported and injected by recycled flue gas stream at 600-800° F. in the reburning zone or in the upper section of the main combustion zone of a boiler. This allows the fuel to be preheated and partially pyrolyzed and gasified in the duct and then injected into the boiler as a mixture of coal, gaseous products, and char. Gasification increases coal reactivity and results in lower carbon-in-ash levels. As an option, the gaseous and solid products can be split using a cyclone separator. Splitting the gasified fuel stream will allow the volatile matter to be used for reburning and the fixed carbon to be injected into the high-temperature main combustion zone.

대표청구항 ▼

This invention discloses the synergistic integration of solid fuel combustion, low NOx control technologies (such as Low NOx Burners, reburning and Advanced Reburning) with partial in-duct gasification of coal or other solid fuels. For partial gasification, the solid fuel can be transported and inje

This invention discloses the synergistic integration of solid fuel combustion, low NOx control technologies (such as Low NOx Burners, reburning and Advanced Reburning) with partial in-duct gasification of coal or other solid fuels. For partial gasification, the solid fuel can be transported and injected by recycled flue gas stream at 600-800° F. in the reburning zone or in the upper section of the main combustion zone of a boiler. This allows the fuel to be preheated and partially pyrolyzed and gasified in the duct and then injected into the boiler as a mixture of coal, gaseous products, and char. Gasification increases coal reactivity and results in lower carbon-in-ash levels. As an option, the gaseous and solid products can be split using a cyclone separator. Splitting the gasified fuel stream will allow the volatile matter to be used for reburning and the fixed carbon to be injected into the high-temperature main combustion zone. erant passage is larger than the passage diameter of the third refrigerant passage. 5. The ejector according to claim 1, wherein a ratio of the passage diameters of the first refrigerant passage, the second refrigerant passage and the third refrigerant passage is approximately 20: 2: 3. 6. The ejector according to claim 1, wherein the mixing portion has a cylindrical passage having a constant passage diameter. 7. An ejector for an ejector cycle system including a compressor, a radiator, an evaporator and a gas-liquid separator, the ejector cycle system being constructed such that gas refrigerant separated in the gas-liquid separator is supplied to a suction side of the compressor and liquid refrigerant separated in the gas-liquid separator is supplied to the evaporator, the ejector comprising: a nozzle for decompressing high-pressure refrigerant flowing from the radiator by converting a pressure energy of the high-pressure refrigerant to a speed energy; and a pressure-increasing portion in which the speed energy is converted to the pressure energy so that the pressure of refrigerant is increased while refrigerant jetted from the nozzle and gas refrigerant from the evaporator are mixed, wherein: the nozzle includes a taper portion in which a passage sectional area is reduced toward a downstream refrigerant side to have a throttle portion at which the passage sectional area becomes smallest, and an outlet passage portion connected to the throttle portion at a refrigerant downstream side; and the taper portion has a taper angle at a refrigerant inlet side, that is larger than that at a side of the throttle portion. 8. The ejector according to claim 7, wherein the taper portion has a taper angle that is changed stepwise. 9. The ejector according to claim 7, wherein the outlet passage portion of the nozzle has a cylindrical shape having a constant passage diameter. 10. The ejector according to claim 7, wherein the outlet passage portion of the nozzle is tapered such that a passage sectional area is gradually increased from the throttle portion toward the refrigerant downstream side.