Reading guidance：Sludge incineration will produce sludge drying for sludge incineration with energy system, can realize the energy saving of sludge treatment. For sludge dehydration and drying process, energy consumpti

    Sludge incineration will produce sludge drying for sludge incineration with energy system, can realize the energy saving of sludge treatment. For sludge dehydration and drying process, energy consumption is the key factor to determine the initial moisture content of sludge drying rate and moisture content of sludge. The target the higher the initial moisture content, drying water target the lower the rate of evaporation, required more water, and the consumption of energy is the water evaporation process of the main energy consumption of dry sludge. And, the more water evaporation, the greater the need amount of gas, carrier gas from the energy is more and more. For the sludge incineration process, not in considering the auxiliary fuel, mud properties incinerator can achieve the temperature and the operation depends on the furnace sludge, especially the water content of sludge into the furnace, and the calorific value of sludge and ash and other industrial analysis and elemental analysis determined Was related to the characteristics. The greater the calorific value of sludge, the proportion of the volatile matter and fixed carbon is higher, ash content is less, the energy generated in the incineration process more. Sludge incineration ash generated less, discharge energy loss is less. Into the furnace sludge moisture content is low, into the burning furnace water less, less heat of vaporization of water absorption in the furnace, and by water vapor caused by exhaust energy loss is less.
   Sludge drying burning combination system in the process of operation, will encounter all sorts of fluctuations in operating conditions, such as the amount of sludge into the factory fluctuations, sludge moisture content into the factory, charging fluctuations, sludge calorific value of sludge moisture content, etc.These fluctuations in operating conditions will have an effect on the combination of the whole system run mode # if excessive sludge drying, highly dry sludge combustion heat generated in the incinerator flue gas, and then through the high temperature flue gas waste heat utilization system for heat is used for the sludge drying, sludge drying process is insufficient energy needs to be added a lot of auxiliary energy.At the same time, due to over temperature of incinerator, may result in burning system run unstable, and burning system on safety of equipment operation and management of material, system installation) the demand is higher.If the dryer is insufficient, the need to add a substantial amount of auxiliary fuel can guarantee the stability of the burning heat, the more is, the more loss.So the total energy consumption is higher.Theoretical calculation that the steam produced sludge incineration is used in the sludge drying needed, when the system reaches equilibrium, for additional steam most hours, system heat utilization efficiency is highest, the lowest cost.
   By establishing sludge dehydration units and residual heat, parameterize all materials and energy brought. Burned for sludge drying operation mode of the combination system were studied. Sludge drying burning combination system energy balance model with environmental conditions, the sludge characteristics of argillaceous (mainly moisture content and heating value) and process operating conditions for the main parameters. Based on the analysis of environmental parameters and mud shale, can be burned on the sludge drying operation mode of the combination system optimization.
  1. the influence caused by moisture content of fed sludge to dehydration and incineration combination system
   Sludge drying process of dry sludge moisture content, the energy consumption increases, because the dry sludge moisture content, the lower the driers to be evaporated water, at the same time, the carrying capacity of need, the more the energy consumption. Energy generated from the sludge incineration process increases with the decreasing of sludge moisture content into the furnace, for charging the sludge moisture content is lower, the less water into the furnace, smoke loss caused by water vapor is the less. But after drying energy generated from the sludge incineration has always been to maintain the same amount of wet sludge drying moisture content to charging, energy gap and decreased with the increase of the degree of sludge drying.
   Factors need to be considered in determining into the furnace sludge moisture content is mainly the incinerator at 850 degrees Celsius bed temperature and stable operation, so that sludge incineration auxiliary fuel at least, the dryer are needed to complement the minimum energy and sludge dry machine's investment is the lowest. Based on these factors into the furnace sludge moisture content in 60%, drying machines need to supplement the energy in the sludge drying to the furnace sludge water rate to the desired intermediate levels of energy supplement.
   2. The influence caused by running load to sludge dehydration and incineration combination system 
  With increase of the amount of sludge treatment, sludge drying need energy and dry sludge incineration generated energy moving average increased, but energy consumption of drying increased faster. If the sludge treatment system is lower than the design load operation, does the system need an external supply of energy is less; such as fruit overload operation. The dry system requires an external supply of energy will increase.
   Adjust the drying unit said adjusting sludge drying unit feed into the furnace. And to ensure that the water content of sludge incineration unit to regulate the 60%. said keep sludge drying unit into the feed to ensure drying after the water content of sludge is 40%, by calculation, regardless of how to adjust the incineration unit, no need for adding auxiliary fuel, but had some effects of energy balance on drying unit. When the load is lower than the design value, the coordinated adjustment of drying system and burning system, reduce the drying system of external energy demand, but because of the high degree of oven dry sludge drying incineration system, is facing the risk of over temperature when the load. Higher than the design value, the feed rate of sludge drying system increases, and increases the amount of steam supplied into the furnace, to ensure the water content of sludge is 60%, the sludge incineration energy increases, so that the drying system of external energy needs Seek the smallest.
   For the influence of inlet sludge loading, it is necessary to consider the impact of sludge drying and incineration combined system, and make a decision based on the external energy supply.
  3. The influence caused by sludge’s thermal value to the balance of system
  Sludge treatment engineering at run time, sludge mud is not fixed. Muddy sludge change of sludge dry incineration combined with operation system mainly in sludge calorific value of sludge incineration system running effect.
   With the increase of sludge calorific value, sludge incineration produces energy linear increase, due to the sludge calorific value of dry process energy consumption has little effect, so dry system the need for external add energy gradually decreases. If the sludge treatment system sludge low calorific value to the design value, into the furnace sludge water rate is 60%, adding auxiliary fuel.
   4. The influence caused by moisture content of sludge fed to balance of dehydration system
    Sludge treatment works at run-time, if encountered in sludge water rate fluctuations, on sludge stem impact system operation. With the increase in plant water content of sludge, sludge drying the consumption of energy increased linearly, drying system the need for external add energy will gradually increase. Due to guarantee into the furnace sludge moisture content is 60%, sludge water content fluctuation on incineration system has little effect.
   Analysis mentioned above is calculated based on dry sludge moisture content control in 40% when the sludge water rate is low, into the furnace of the mixed sludge water rate is low, at this point, appropriate to increase the stem after the sludge moisture content, to reduce sludge dry the energy consumption of the system, and not as the sludge incineration system over temperature operation.
 
  
  
  
 

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