Vertical fluidized flue gas drying process for bagasse

Abstract

The invention relates to a vertical fluidized flue gas drying process for bagasse. The process comprises the following steps of: (1) inputting flue gas and undried bagasse into a vertical fluidized flue gas dryer; (2) mixing the flue gas and the undried bagasse to obtain a fluidized mixture of the undried bagasse and the flue gas; (3) vertically flowing the fluidized mixture of the undried bagasse and the flue gas upwards along an inner cavity of the vertical fluidized flue gas dryer under the action of a drying system draught fan; (4) monitoring the condition of the fluidized mixture, and regulating and controlling the input amount of the undried bagasse; (5) performing mixed flow for heat exchange, feeding the fluidized mixture into a setting separator, discharging the separated dried bagasse from a bagasse discharging device, and feeding dusty flue gas into a purification device; and (6) treating the dusty flue gas through a cyclone separation purifier, discharging the obtained bagasse from the bagasse discharging device for recycling, and exhausting the waste flue gas from the draught fan. The vertical fluidized flue gas drying process has the advantages of high drying efficiency and easy popularization.

Description

technical field [0001] The invention relates to a bagasse drying process, in particular to a vertical fluidized flue gas drying process of bagasse. Background technique [0002] Bagasse is a renewable biomass energy source. Sugar factories use bagasse after papermaking fibers are extracted to produce steam and generate electricity, realizing resource recycling in the form of sugar-electricity co-production. Because the combustion efficiency of wet bagasse is not high, and even coal needs to be burned, at present, the sugar factory uses the flue gas discharged from the boiler of the self-provided thermal power plant with a temperature as high as about 200°C to dry the bagasse in the mode of mixing-drying-separation, such as When the water content of bagasse is reduced from about 50% to about 35%, the calorific value will increase by 800 kcal / kg, the furnace temperature will increase by 20%, and the steam production will increase by 16-18%. Yuan's economic benefits. Even so,...

AI Technical Summary

Problems solved by technology

Even so, the mode of mixing-drying-separation has the advantages of high efficiency and large quantity, but it is difficult to separate the bagasse from the dried fluid gas-slag mixture at one time, especially the fine dust-like substances will be The airflow takes it away and requires further treatment; because the evaporated water vapor in the low-temperature flue gas discharged from the dryer makes the dust material damp, it is difficult to remove the bagasse produced by the separation and purification equipment, and the exhaust flow is large, and it is difficult to ensure It does not affect the normal work of the boiler, and there is currently no effective method capable of handling this task in China