Coal dry distillation device

Abstract

The coal dry distillation device is provided with a dry distillation device of their invention main body which is provided with an inner tube to which the dry coal is supplied and an outer tube which covers the inner tube, and which indirectly heats the dry coal in the inner tube by means of a heating gas supplied to the outer tube and generates dry-distilled coal and dry distillation gas. This coal dry distillation device is provided with a mercury adsorption suppressing means which suppresses adsorption of mercury contained in the dry distillation gas into the dry-distilled coal, wherein the mercury adsorption suppressing means is an exhaust tube which discharges a gas inside the inner tube. The gas inlet port of the exhaust tube is arranged in a region between the substantially central portion in the longitudinal direction and the coal heating unit outlet in the inner tube.

1 . A coal pyrolysis device including a pyrolysis device main unit including an inner tube to which dried coal is fed and an outer tube which covers the inner tube, and configured to produce pyrolysis coal and pyrolysis gas by indirectly heating the dried coal in the inner tube with heating gas fed into the outer tube, characterized in that the coal pyrolysis device comprises low-mercury-content pyrolysis coal producing means for reducing adsorption of mercury contained in the pyrolysis gas to the pyrolysis coal, or removing the pyrolysis coal to which the mercury has adsorbed, to produce the pyrolysis coal containing a small amount of the mercury. 
     
     
         2 . The coal pyrolysis device according to  claim 1 , characterized in that
 the low-mercury-content pyrolysis coal producing means is a discharge pipe through which to discharge the gas in the inner tube, and   a gas inlet port of the discharge pipe is located in the inner tube between a substantially center portion in a longitudinal direction and an exit of a coal heating portion in which the coal is heated by the heating gas.   
     
     
         3 . The coal pyrolysis device according to  claim 2 , characterized in that the coal pyrolysis device further comprises:
 pyrolysis coal discharging means for discharging the pyrolysis coal; and   carrier gas feeding means for feeding carrier gas to the pyrolysis coal discharging means.   
     
     
         4 . The coal pyrolysis device according to  claim 3 , characterized in that the coal pyrolysis device further comprises heating gas delivering means for delivering the heating gas discharged from the outer tube to the carrier gas feeding means. 
     
     
         5 . The coal pyrolysis device according to  claim 4 , characterized in that the heating gas delivering means includes:
 cooling means for cooling the heating gas;   purifying means for purifying the cooled gas cooled by the cooling means; and   a purified gas delivery pipe through which to deliver the purified gas purified by the purifying means to the carrier gas feeding means.   
     
     
         6 . The coal pyrolysis device according to  claim 1 , characterized in that the low-mercury-content pyrolysis coal producing means is preheating drying means, provided at a stage before the pyrolysis device main unit, for producing preheated dried coal by indirectly heating the dried coal before being fed into the inner tube with preheating gas. 
     
     
         7 . The coal pyrolysis device according to  claim 6 , characterized in that the dried coal is heated by the preheating gas to between 280 and 350° C. 
     
     
         8 . The coal pyrolysis device according to  claim 1 , characterized in that
 the coal pyrolysis device further comprises pyrolysis coal discharging means for discharging the pyrolysis coal, and   the low-mercury-content pyrolysis coal producing means includes: a classification device configured to classify the pyrolysis coal discharged from the pyrolysis coal discharging means into coarse pyrolysis coal with a predetermined particle size or larger and fine pyrolysis coal with a particle size smaller than the predetermined particle size; and fine pyrolysis coal discharging means for discharging the fine pyrolysis coal classified by the classification device.   
     
     
         9 . The coal pyrolysis device according to  claim 8 , characterized in that
 the classification device includes a classification plate for classifying the pyrolysis coal, and   a through-hole in the classification plate measures 0.42 mm to 2 mm.   
     
     
         10 . The coal pyrolysis device according to  claim 1 , characterized in that
 the coal pyrolysis device further comprises pyrolysis coal discharging means for discharging the pyrolysis coal, and   the low-mercury-content pyrolysis coal producing means includes: a classification device located between the inner tube and the pyrolysis coal discharging means and configured to classify the pyrolysis coal discharged from the inner tube into coarse pyrolysis coal with a predetermined particle size or larger and fine pyrolysis coal with a particle size smaller than the predetermined particle size; and fine pyrolysis coal discharging means for discharging the fine pyrolysis coal classified by the classification device.   
     
     
         11 . The coal pyrolysis device according to  claim 1 , characterized in that
 the coal pyrolysis device further comprises pyrolysis coal discharging means for discharging the pyrolysis coal, and   the low-mercury-content pyrolysis coal producing means is a pyrolysis coal transport acceleration device configured to quickly transport the pyrolysis coal in the inner tube toward the pyrolysis coal discharging means.   
     
     
         12 . The coal pyrolysis device according to  claim 11 , characterized in that a tip portion of the pyrolysis coal transport acceleration device is located in the vicinity of a furnace wall of the outer tube on a pyrolysis coal discharge port side. 
     
     
         13 . The coal pyrolysis device according to  claim 1 , characterized in that
 the coal pyrolysis device further comprises pyrolysis coal discharging means for discharging the pyrolysis coal in the inner tube,   the low-mercury-content pyrolysis coal producing means is a plate body fixed to the pyrolysis coal discharging means and extending in a longitudinal direction of the inner tube, and   the plate body is located in contact with an upper portion of the pyrolysis coal.   
     
     
         14 . The coal pyrolysis device according to  claim 13 , characterized in that the coal pyrolysis device further comprises inert gas feeding means for feeding inert gas into the pyrolysis coal discharging means. 
     
     
         15 . The coal pyrolysis device according to  claim 1 , characterized in that
 the coal pyrolysis device further comprises pyrolysis coal discharging means for discharging the pyrolysis coal, and   the low-mercury-content pyrolysis coal producing means is a heating device provided in the pyrolysis coal discharging means and configured to heat the pyrolysis coal in the vicinity of the pyrolysis coal discharging means.   
     
     
         16 . The coal pyrolysis device according to  claim 15 , characterized in that the heating device is a burner. 
     
     
         17 . The coal pyrolysis device according to  claim 15 , characterized in that the heating device is a heat exchange tube which is provided rotatably and in which heating gas is capable of flowing. 
     
     
         18 . The coal pyrolysis device according to  claim 1 , characterized in that
 the coal pyrolysis device further comprises pyrolysis coal discharging means for discharging the pyrolysis coal, and   the low-mercury-content pyrolysis coal producing means is an oxidant feed device configured to feed oxidant to the pyrolysis coal in the vicinity of the pyrolysis coal discharging means.