Study On High Efficient Incineration Technology Of Ship Garbage Supplemented By Pulverized Coal

The mechanism of ship garbage incineration and the main factors of affecting the incineration were expounded, the methods and theories of combustion characteristics and reaction kinetics were introduced. and the ultimate analysis, proximate analysis,calorific value test and thermal analysis of the main combustible components of ship garbage, such as kitchen waste, waste paper, wood, rubber, plastic, fabric, sludge and so on, were carried out to elaborately study the thermal dynamic performance of ship garbage incineration. Results show that the combustion characteristic and reaction kinetics of the ship garbage varies greatly from one component to another, weightless stage of ship garbage mainly concentrates in the range from 250 ℃ to 600 ℃, the apparent activation energy mostly less than 100 k J·mol-1, easy to realize the combustion reaction and suitable for incineration. Ship garbage overall has the physical property characteristics of high moisture, high volatile and low calorific value, low ash content, in order to reduce the drying time of ship garbage and guarantee the stability of ignition and incineration, it is necessary for ship garbage to supplement the auxiliary fuel.The high efficient incineration technology of ship garbage supplemented by ultrafine pulverized coal was explored, by comparison of ultrafine and conventional pulverized coal in the particle size distribution, porosity and specific surface area, coal quality, to study the combustion characteristics and reaction kinetics of ultrafine pulverized Fujian anthracite. Results show that ultrafine pulverized Fujian anthracite has more uniform particle size distribution, increased porous volume and specific surface area and higher volatile matter content. Besides, with the decrease of coal particle size, the activation energy of Fujian anthracite reduces and its ignition and burnout temperatures linearly decrease in a linear trend. According to the more apparent uptrend of the comprehensive combustion characteristic parameter of Fujian anthracite with the decrease of the coal particle size, ultrafine pulverized action has more positive significance to Fujian anthracite which has difficulties in ignition, stabilization and burnout. Taking Fujian Longtanlin anthracite as an example, as the average coal particle size decreased from 53.488 μm to 13.716 μm, its ignition temperature, burnout temperature and apparent activation energy reduced from 673.17 ℃, 802.05 ℃ and 191.39 k J·mol-1 to 658.07 ℃, 773.7 ℃ and 177.28 k J·mol-1, respectively, while its comprehensive combustion characteristic index increases from 4.919×10-8 to 5.705×10-8.The high efficient incineration technology of ship garbage supplemented by blended pulverized coal was explored, by studying the blended coal combustion characteristics and reaction kinetics under various blended proportions study under &coal mixing proportion, taking pulverized Shenmu coal and Fujian anthracite with different particle sizes as objects. Results show that there are obvious changes in combustion characteristics compared the blended coal with kinds of single coals. The existence of the coal with high reactivity can significantly improve the ignition and combustion of the fire resistant coal. As the fire resistant Fujian anthracite blended with high quality Shenmu coal, the initial release temperature of volatile, ignition temperature and burnout temperature respectively drops about 260 ℃, 240 ℃, and 40 ℃, the comprehensive combustion characteristic index raises an order of magnitude, the apparent activation energy also significantly decreases. Besides, the smaller particle size of Fujian anthracite hard to ignite and burn, the greater contribution to improve the effect of combustion characteristic of blended coal. Taking the improvement of fire resistant coal and the cost saving of high quality coal into comprehensively, it is preferred that the proportion of these two kinds of corresponding coals is seven to three.Numerical simulation of the shipborne garbage incinerator supplemented by pulverized coal was carried out using ANSYS CFX, such as combustion temperature field, radiation intensity field, concentration field and so on. Results show that the shipborne garbage incinerator supplemented by pulverized coal, the main gas phase zone in its furnace almost lies in the high temperature at 1000 K to 1400 K and the radiation intensity in its furnace is also at a high level, helpful for sufficient combustion of combustible component of the ship garbage, improving the efficiency of ship garbage incineration, effectively preventing the generation of dioxin-like pollutants.