Method for improving circulation efficiency of paper mill boiler materials
A technology of material circulation and paper mills, applied in the field of paper making, can solve the problems of insufficient material separation, difficult connection of boiler heat load, high exhaust temperature, etc., and achieve the effect of increasing separation efficiency, improving boiler economic efficiency and increasing separation capacity
Active Publication Date: 2019-09-10
LIANSHENG PAPER IND LONGHAI
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Problems solved by technology
[0004] The design center height of the existing circulating fluidized bed boiler is 8.3 meters. When coal ash with high ash content is used, the separation of materials is insufficient and the exhaust gas temperature is high, which makes it difficult to take over the heat load of the boiler
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[0025] In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.
[0026] see figure 1 as well as figure 2 , this embodiment relates to a boiler furnace in a paper mill, the left furnace is a combustion chamber 10, the right furnace is a cyclone separator, the cyclone separator is connected to the combustion chamber 10 through a feeder, and the feeder fan is arranged below. The material burns for the first time in the combustion chamber 10 and enters the cyclone separator. The cyclone separator separates the recyclable materials into the feeder, and the recycler sends the recyclable materials back to the combustion chamber 10 for secondary combustion.
[0027] In particular, it relates to a method for improving the material circulation efficiency of a boiler in a paper mill, comprising the followi...
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The invention relates to a method for improving the circulation efficiency of paper mill boiler materials. The method comprises the following steps that the ash content of coal needing to be added into a boiler is detected, and the height of a boiler cyclone separator central cylinder is adjusted; the air pressure at the bottom of a combustion chamber and the air pressure at aninlet of the cycloneseparator central cylinder are detected, and whether the differencebetweenair pressure ofthe bottom of the combustion chamber and the inlet of the cyclone separator central cylinder is within a preset range or not is calculated; and if the difference betweenair pressure at the bottom of the combustion chamber and the inlet of the cyclone separator central cylinder is within the preset range, normal combustion is carried out, otherwise, adjusting of the height of the boiler cyclone separator central cylinder is continuously carried out. Differing from the prior art, the method has the characteristics that the difference between the air pressure at the bottom of the combustion chamber and the inlet of the cyclone separator central cylinder can be kept within the preset range, and thus suspended particles are prevented from being taken away by rising air flows due to expanding of the diameters of the air flows; and the material separating capability is effectively improved, so that the materials are fully recycled, and the economic efficiency of the boiler is improved.
Description
technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for improving material circulation efficiency of boilers in paper mills. Background technique [0002] In the prior art, the boilers used in paper mills are generally single drums, which are generally divided into two shafts at the front and the rear. The front shaft is a general suspension structure, surrounded by membrane water walls. The tail shaft adopts a supporting structure, and the two shafts are connected by a vertical cyclone separator, and the lower part of the separator is connected with a return device and an ash cooler. [0003] The principle of the boiler cyclone separator is that the hot flue gas of the high-temperature material passes through the upper part of the cyclone separator, and enters the central cylinder under the action of gravity to rotate, and the suspended particles fall from between the inner and outer cylinders. Upward movement into...
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IPC IPC(8): F23C10/10F23C10/26F23C10/28
CPCF23C10/10F23C10/26F23C10/28F23C2206/10
Inventor 蒋忠生卢占导
Owner LIANSHENG PAPER IND LONGHAI