Dangerous trash (danger of the following abbreviation is useless) difference of complex, area spends phyletic and various, part serious, handle undeserved meeting to bring a series of the people's livelihood and social issue. Our country from 20 centuries 90 time begin to use rotary kiln to burn stage by stage systematic processing danger is useless. In recent years, because fireproof material mars the accident stopping kiln that cause to have more,happen, affected danger badly to abandon burn the steady movement rate of product line, useless to rotary kiln danger incinerator is able to bear or endure the innovation of material is optimized, green environmental protection and efficient move etc raised pressing requirement.
1, our country danger is useless harmless change deal with the current situation in recent years, danger of our country industry abandons generation capacity to increase quickly. According to statistic, 2018 200 big, medium capacity of useless generation of urban industry danger amounts to 46.43 million T, harmless change deal with measure twenty-four million eight hundred and twenty-five thousand T. 2020, because new coronal is pneumonic the influence of epidemic situation, a large number of the medical treatment danger of generation is useless addition, danger useless gross is added to nearly 100 million T. Burn the law is special effective harmless change deal with one of methods, include incinerator of professional rotary kiln and cement kiln to cooperate with two kinds of means. According to statistic, our country danger is useless 2018 burn deal with produce can dimensions is achieved annual 6.16 million T, rotary kiln of course of study of its technical secondary school burns occupy than 53% , basically distributing in and other places of Zhejiang, Jiangsu, Shandong, Heibei, Fujian.
2, rotary kiln of system of rotary kiln incinerator burns systematic sketch map sees figure below, by rotary kiln, 2 light room, more than heat boiler, urgent cold tower, de-acidification, remove dust the system is formed.
Graph 1 note: Danger abandons rotary kiln of our country of system of incinerator of rotary kiln type burn the system has 800 processing product line about, processing capability from everyday 20t arrives everyday 120t differs, basically be with direct current type is given priority to.
3, rotary kiln liner is able to bear or endure the danger of processing of danger useless incinerator abandons rotary kiln of material design current situation to basically be contain Cl, S, P, haloid material, inorganic salt, fluoride to wait for a few chemical stock, handle a few waste gas and liquid waste at the same time, stock character is complex. Rotary kiln noumenon is the equipment of key of rotary kiln incinerator.
Be designed according to workshop and energy-saving wait for a requirement, brick of optional choose monolayer, double deck brick, compound brick and whole are pouring wait for different design program. According to handling temperature and danger useless sort differs, material can choose working layer firebrick commonly character tall aluminous brick, corundum is Mo Laishi brick, chromic zirconium corundum brick. Design total ply basis to need, differ to 350mm from 200mm.
Graph 2 note: Rotary kiln designs sketch map
4, fireproof material mars liner temperature of job of state rotary kiln is 800~1200 ℃ , temperature of the flue gas inside actual kiln achieves 1300 ℃ above, partial liner contacts fluid of percolation filtration of the eject inside slaggy, kiln to wait directly, to fireproof material refuse the demand such as sex of aggressivity, heatproof shake and corrosion resistance taller.
Graph 3 note: Distributinging sketch map of area of incinerator of rotary kiln of distributinging sketch map of area of rotary kiln incinerator sees a picture 3, cent expects to enter area of area, dry section, combustion is mixed area burning ashes. Grow diameter to compare according to rotary kiln or each area change.
Graph 4 note: Rotary kiln is fireproof ply of material incomplete brick pursues 4 show case of ply of remains of the firebrick after giving some danger to abandon a project to use 1 year. Basically mar flake in order to heat up, physics wears away and chemistry is eroded give priority to, kiln head flakes with heat into makings end and mechanical wear is given priority to, dry paragraph wear away equably, high temperature area is eroded with chemistry, mechanical wear is given priority to. Among them, fireproof material mars high temperature area quickly is the main reason of overhaul stopping furnace. The diffraction of ray of incomplete brick X after corundum brick uses some project chromium 1 year is analysed (see a picture 5) show, produced many nepheline kind mineral, detect at the same time piece 6 price chromium exists. Its microstructure is analysed (see a picture 6) show, look of glass of compact firebrick interior is more, can conclude salt of the natrium in stock and fireproof material produce reaction, erode and bring about fireproof material to mar, can produce ruinous bulk to expand at the same time, destroy fireproof material composition.
Graph 5 note: The XRD a collection of illustrative plates of brick of rotary kiln incomplete
Graph 6 note: The SEM photograph of brick of incomplete of chromium steel jade
5, basis of liner of epilogue danger useless rotary kiln needs, design formal diversity, should pay close attention to the element such as content of good stuff of waste liquid quantity, moisture content, metal pail, salt and fluorine content. To area of combustion of high temperature of incinerator of slaggy type rotary kiln, chromic corundum pledges fireproof material is fought erode an advantage apparent. But danger is useless burn chromium of below operating mode 6 price forms a problem to highlight, should begin change research without chromium. Be opposite as the country of the superintendency strength of dangerous trash increase, large rotary kiln burns technical general receives wider application in danger useless processing, fireproof to rotary kiln incinerator material is optimized and the design posed a challenge.
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