Hot-air generating apparatus for biological substance for combustion
A hot air generating device and biomass technology, applied in heating devices, lighting and heating equipment, dryers, etc., can solve the problem of uneven air distribution of Γ-shaped directional air caps, turbulent air flow in dense phase areas, and large wear of adjacent air caps, etc. problems, to avoid local non-fluidization or poor fluidization, stabilize the hot air volume and temperature, and enhance the effect of swirling fluidization
Inactive Publication Date: 2007-08-29
TSINGHUA UNIV
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Problems solved by technology
Most of these types of hoods have certain defects: mushroom-shaped hoods and inverted conical flat-plate gap hoods have no directional function, and are prone to slag leakage; bell-type hoods have greater wear on the water-cooled wall, and greater wear on adjacent hoods. The directional slag discharge function is weak; the Γ-shaped directional air cap is prone to uneven air distribution, which is likely to cause airflow disturbance in the dense phase area and weaken the overall fluidization effect. It is usually only used near the slag discharge port of the waste incineration fluidized bed that requires special slag discharge; arrow The slag leakage phenomenon in the air chamber is common in the shaped air cap
The disadvantage of using partition heat exchange is that the hot air temperature is greatly disturbed by the fuel side, and it is difficult to keep the hot air temperature stable
Method used
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[0014] The invention is composed of a circulating fluidized bed boiler 1, a biomass feeding system 2, a gas-solid separator 3, an air-water heat exchanger 5, a circulating fan 6, and thermal instruments. The biomass enters the circulating fluidized bed boiler 1 through the biomass feeding system 2. The biomass feeding system adopts a double auger system, and the feeding speed of the second-stage auger in the double-auger system is much higher than that of the first stage. The feeding speed can effectively prevent tempering. The circulating fluidized bed boiler 1 (Fig. 2) uses water or organic heat carrier as the medium, and the water or organic heat carrier adopts forced circulation. The boiler is composed of a furnace and a tail shaft flue. The four walls of the furnace are water-cooled walls 8, and a screen-type heating surface 9 is arranged in the furnace to ensure that the furnace is within the set temperature range, which is beneficial to the combustion of biomass and pre...
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A kind of heat-blow device which burns biomass composes of circulation fluidized bed boiler furnace that burn biomass, biomass-feed system, air-water heat exchanger, circulation fan, thermodynamic instrument and so on. Its basic characteristic is: the circulation fluidized bed boiler furnace's main fuel is biomass such as agricultural and forestry waste materials, and its mediator is organic heat carrier or water; the front tank walls of the boiler furnace is water wall, Directional Buttons are set on the all Air Ventilation Board, and the Directional Buttons are laid rotatably; the speed of the furnace tank empty bed is up rated. The characteristic of the device lays yet, to set secondary heat exchanging system, to adapt converter technique and heated air recycling technique after drying and so on, which makes sure hot-air flux and temperature are stable. This invention has the merits of energy conservation and environmental protection. We can control the hot air temperature exactly. The wind rate and wind temperature are particularly stable, and when drying agricultural and forestry things, food substance and other substance needing hot-wind drying under low temperature, it is very stable, economical and environmental.
Description
technical field [0001] The invention relates to a biomass-burning hot air generating device, in particular to a biomass-burning circulating fluidized bed boiler, which belongs to the field of biomass energy and renewable energy utilization equipment. Background technique [0002] Because biomass has the characteristics of high moisture content, high volatile content, low fuel density, and relatively loose structure, the design and operation mode selection of biomass combustion equipment needs to consider the combustion characteristics of different types of biomass. In the existing technology, the bed combustion furnace burns biomass. Due to the fast precipitation of biomass volatiles, the incomplete combustion will be caused by uneven air mixing, thereby affecting the combustion efficiency; at the same time, due to the high moisture content of the biomass, it is difficult to Surface ignition also affects its combustion efficiency. Circulating fluidized bed boilers have wide...
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Login to View More IPC IPC(8): F26B23/02
Inventor 张衍国李清海姚忠建蒙爱红
Owner TSINGHUA UNIV