Product details
Brief:
The sludge containing hazardous organic impurities, etc, for the country to determine risk of solid compounds, drying in the process of toxic gas emissions, are difficult to be closed-loop drying, drying process to the pollutants into the incinerator, should not be so use the tail flue gas direct drying method, the reason is: 1) if the tail flue gas direct drying, dry flue gas must be back to the chamber and a large number of circular flue gas interior, causes incinerator combustion instability, low efficiency of the boiler, fan energy consumption increases, must check the fan performance curve, if necessary, to replace the fan; 2) dry heat utilization efficiency is less than 40%, to 130 ℃ of flue gas After dryer to 80 ℃, the heat utilization efficiency up to 38.5% (130-80) / 130 =; 3) if the incinerator tail exhaust smoke temperature is low, the tail heating surface (such as Economizer and air preheater) and corrosion, chimney easily happened affect system stable operation. Between the above reasons, this scheme adopts the heat transfer fluid drying methods, heat carrier for steam. Internal closed loop flow, dry waste unnecessary waste gas into the incinerator, no emissions. Dry heat source for vapor, dryer export hot water back into the incinerator, using the steam gasification of latent heat drying sludge, dry heat utilization efficiency can reach 85% (heat loss mainly equipment heat dissipation and fluidization wind to take away part of the sensible heat). If the tail a chimney for wet, can be appropriately reduce the flue gas temperature, improve the steam flow rate, fire out of dry system energy balance point of view, is equal to the use of the tail flue gas heat.
The principle of After mechanical dewatering by transmitter into wet sludge fluidized bed dryer, under the action of High temperature flue gas are suspended boiling state, High temperature flue gas and sludge in cross flow, High temperature flue gas as High efficient heat exchange medium, the sludge in the process of boiling, evaporates. Specially designed fluidized bed dryer internal structure can make wet sludge to join in a row, from the end product of dry sludge from the other end of the continuous eduction. Was evaporated water through the condenser to recycling, side by side to Handled sewage system. Part of the dried sludge and wet sludge mixture in the mixer and then into the fluidized bed dryer. Sludge pyrolysis is under the condition of the anaerobic or anoxia, heated to a certain temperature (high temperature: 500-1000 ℃, low temperature, less than 500 ℃), the solid material is decomposed into three kinds of fuel oil, no non-condensable gas and carbon.
The main features
(1) operation is flexible and can run continuously. According to the requirements of the sludge ultimate disposal, by adjusting the fuel/coal, bed velocity, sludge quantificationally, get different dry solid content of sludge.
(2) because of the particles in the fluidized layer in a state of intense exercise, mass transfer and heat transfer between the particles and gas quickly and high heat transfer efficiency and the evaporation rate, water content can be more than 80% of the high humidity in a dry raw materials to water content below 5%, low energy consumption. And sludge moisture volatilizes instant reaction in the fluidized bed, short drying time, temperature distribution in the furnace is consistent, dry degree of the product and granularity.
(3) design of fluidized bed dryer is compact, Handled capacity per unit area is very big, the space share is low, no mechanical transmission parts, less failure, low construction cost and investment cost.
(4) product dried sludge has good physical form, such as appearance, size, color, moisture absorption, etc.), chemical form (water, organic matter, total phlegm and trace elements) stable and does not produce secondary pollution, disposal or resource utilization is safe.
(5) can be according to the requirements of different matching of different drying process. (such as Rotary drum drier, Vibration fluidized bed drier, paddle drier, belt type drier, etc.