Analysis of circulating fluid bed sludge incineration process

Author: Taida machine       Release time:2016-08-19
Reading guidance:I. Composition of circulating fluid bed sludge incineration process 1.Sludge pool: types of sludge pool are decided by scale of incineration project. Small scale can choose steel sludge pool. Large sca
I. Composition of circulating fluid bed sludge incineration process
  1. Sludge pool: types of sludge pool are decided by scale of incineration project. Small scale can choose steel sludge pool. Large scale can choose reinforced concrete sludge pool. Anti-corrosion matters are supposed to be added in the inner wall of sludge pool.
  2. Sludge conveying equipment. Adopt sludge conveying pump to convey sludge directly to sludge incineration furnace and sludge dehydration equipment.
  3. Sludge dehydration system: the function of sludge dehydration system is to dry sludge with 80% moisture content to 40% to 50% semi-dry sludge. Sludge drying equipment, hollow oar leaf dry machine or twisted cage can be used for drying machine, hollow blade dry machine as an example that drying process: hollow blade type sludge dry system by sludge re-claimer, sludge feeder, hollow blade type sludge dryer sludge out feeding machine, condenser, dry sludge conveyor, condensation waste water composition.
   4. Sludge disposal system: condensated water in sludge after evaporation is sewage; can choose the biological treatment technology of membrane separation technology for processing; can also be transported to the sewage treatment plant.
   5. Storage and transportation system for dried sludge: Dry sludge from the sludge dry equipment out to dry sludge storage are odor source. Dry sludge from the sludge drying equipment to dry sludge storing, using closed type belt conveyor. Sludge storing the negative pressure technology to prevent the leakage of smell. Dry sludge from the repository to the front of the furnace dry sludge bin sent by belt conveyor.
  6. Storage and conveying system for coal: General municipal sludge calorific value for tens of thousands of cards per kilogram, theoretically, incineration method processes the heat balance. But due to the burning of the loss of process in the boiler efficiency and dry heat loss in the process, moisture content of 80% of the sludge in the incineration process need to add about 5% to 10% weight ratio of raw coal.
  7. Fluid bed sludge incineration furnace: Incinerator with fluid bed combustion technique, for the sludge in the furnace suspension combustion and low calorific value characteristics, incinerator with a certain size of quartz sand as a heat carrier, in the flow of air blowing in the role, the coarse quartz sand in the combustion chamber is arranged under the tumbling motion, fine particles blowing from the furnace chamber is high-temperature separator detached and send back to form a circulating material, so as to improve the incineration furnace suspension space gas solid mixing and heat and mass transfer rate, the furnace temperature uniformity.
  8. Flue gas purification tower: The purification tower is mainly used in the process of removing the acid gas in the flue gas by using the method of spraying activated carbon adsorption of dioxin. So that the flue gas sulfur dioxide and dioxin emission standards.
II. Environmental protection function of circulating fluid bed sludge incineration disposal process
  1. Anti-odor design: The odor is mainly source from sludge tank inlet and dried sludge thermal! So in process design will be sludge pool remain blocked, and odor by a wind machine is pumped to the incineration boiler, sludge pool area and sludge drying area to keep negative pressure, to prevent the escape of the odor.
  2. Boiler flue gas disposal: Fluid bed is a kind of clean burning, burning furnace sludge "coal and bed material doped mixed is very fierce, complete and stable combustion, the combustion in the furnace temperature is maintained between 850-950 degrees Celsius, the flue gas in the furnace residence time over 3S, effective inhibition of NOx and dioxin generation.
  3. Waste water disposal: The equipment is used for cooling water after cooling. The sewage sludge is collected into the sewage treatment system. After being treated by the sewage treatment system, the sewage treatment system is used for the greening of the plant area, the ash humidification water and the washing water.
  4. Solid wastes disposal: how to dispose fly ash is decided by analysis result.
III. Advantages of circulating fluid bed sludge incineration process
  1. Incineration can reduce the volume of excess sludge to the minimum, and the reduction is the most thorough.
  2. After passing relevant tests, incineration ash can be used for building materials, is a relatively safe way to dispose of sludge.
  In summary, sludge treatment of circulating fluid bed boiler, sludge treatment method is the most complete, most can achieve the sludge "harmless, reduction, resource of the target; 80% moisture content of sludge incineration in circulating fluid bed boiler, with the steam drying part of the sludge, the sludge containing the calorific value of the efficient use of its energy, basic to achieve self balance, the auxiliary fuel is less, greatly reduces the cost of sludge treatment; incineration furnace adopts a cylindrical insulation design, low failure rate; waste heat boiler main steam for sludge drying, using low-pressure super heated steam, with low material requirement; make the boiler overall low cost, and high reliability; belongs to the general waste and hazardous waste sludge can be used self-balancing circulating fluid bed sludge incineration technology for processing. 

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