Two-stage separation circulation fluidized bed boiler with high-low bed
A circulating fluidized bed and two-stage separation technology, applied in the boiler field, can solve the problems of unsatisfactory separation of fly ash and low combustion efficiency, and achieve the effect of reducing refractory materials and reducing the total height of the boiler
Active Publication Date: 2011-03-23
黎仲文 +1
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Problems solved by technology
[0003] Regardless of whether it is an internal circulating fluidized bed boiler or an external circulating fluidized bed boiler, although the structure of the separator is not complicated, the effect of separating fly ash is not ideal. In addition, the fly ash returns to the same bed for combustion, and the combustion efficiency is not high
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[0012] control figure 1 , the circulating fluidized bed boiler with two-stage separation of high and low beds in the present invention consists of a main bed that is a high fluidized bed 1, an auxiliary bed that is a low fluidized bed 2, a slag overflow tank 3, a front membrane wall 4, a rear membrane wall 5, The cyclone separator is composed of 6. The front and rear membrane walls 4 and 5 divide the furnace into a main bed 1 and an auxiliary bed 2 and make the flue gas form three return journeys. The fuel flows into the main bed 1 from the coal drop pipe 6 and burns, the burnt ash and stones are discharged through the slag discharge pipe 7, and the unburned lighter coal particles slip through the slag overflow groove 3 to the auxiliary bed 2 to continue burning And ignite the fly ash on the auxiliary bed 2. The unburned fine particles blown by the wind on the main bed 1 rise to the upper suspension section of the main bed 1 to continue burning. The flue gas and fly ash flo...
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The invention provides a two-stage separation circulation fluidized bed boiler with a high-low bed, which comprises a cyclone separator. Two platen type membrane walls are arranged in a furnace hearth, and the furnace hearth is divided into three parts to form a main fluidized bed and an accessory fluidized bed i.e. a high-low fluidized bed and three backhaul flue gas channels, wherein a first backhaul is a main bed and a suspension section, a second backhaul is a flue gas channel formed by a front membrane wall and a back membrane wall, and a third backhaul is a flue gas channel formed by the back membrane wall and a back wall. Because high-low bed three-backhaul combustion is adopted, the carbon content of slag is lowered to 0.04 percent, the carbon content of fly ashes is lowered to 3.52 percent, the heat efficiency of the boiler achieves 86 percent, and the effects of energy saving and emission reduction are remarkable. The invention can be used for a single drum or double drum circulation fluidized bed boiler which is newly designed or reformed.
Description
technical field [0001] The invention relates to a boiler, in particular to a circulating fluidized bed boiler with two-stage separation of high and low beds. Background technique [0002] An important feature of existing circulating fluidized bed boilers is the separator, whose function is to separate the fly ash containing combustibles from the flue gas. The better the separation effect, the higher the combustion efficiency of the boiler. According to the separator, there are two types of circulating fluidized bed boilers: one is an internal circulating fluidized bed boiler, which uses a membrane wall to form a vortex separator in the furnace; the other is an external circulating fluidized bed, which One or two cyclone separators are installed at the outlet of the furnace for this type of boiler. The separated fly ash returns to the fluidized bed for combustion. [0003] Regardless of whether it is an internal circulating fluidized bed boiler or an external circulating fl...
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IPC IPC(8): F23C10/26F23C10/08
Inventor 黎仲文陈业东
Owner 黎仲文