Power generating method of carbon-molecule gasification combustion boiler

Abstract

A power generating method of Carbon-molecule gasification combustion, the method comprising the following main processes: taking coal with desulfurizing agent, and first conducting desulfirization and gasification in a molecular gasifier to produce clean coal gas; mixing hot coal gas and low excess air for combustion in the furnace of a boiler; conducting coke refining and dust removal in accordance with coal quality and demand; after heat transfer via the heated surface of the boiler, emitting high temperature flue gas complying with the standard from the chimney; and the vapor generated by the boiler drives a steam turbine to generate power. The gasification method can be applied to a power generating system of a gas engine and a gas turbine to produce desired cooling coal gas, and can also produce chemical feed gas. The method has a simple process, which is energy saving.

1 . A power generating method of Carbon-molecule gasification combustion, the method comprising the following main steps:
 step 1: adding a desulfurizing agent to coal, and conducting desulfiurization and gasification in a molecular gasifier to produce a hot coal gas and a coke dust wherein;   the structure of the molecular gasifier is designed so that inside the gasifier the complete oxidization of a thick bed with a large interface designed in the molecular level matches the positive reduction reaction of a thick bed with a small cross section;   the molecular gasifier can desulfurize the coal in the absence of the oxygen where the ratio between Ca and S in the desulfurizing agent approaches 1;   the molecular gasifier is provided with a regional adjusting means comprising an annular temperature measurement hole on the upper reduction zone and an annular steam spraying hole correspondingly provided on lower oxidation zone
 wherein, depending the change of temperature measured on the temperature measurement point, an adjustment can be effected by means of steam to ensure a complete oxidation of the thin bed with a large interface matching the positive reduction of the thick bed with a small cross section steadily operate; 
   a fuel for the molecular gasifier can be any one of various coal, biomass and other organic waste,   step 2: mixing the hot coal gas and low excess air for combustion in a furnace of a boiler with more than one sides, after heat transfer via a heated side of the boiler, emitting a high temperature flue gas complying with the standard from a chimney, wherein
 a vapor generated by the boiler drives a steam turbine to generate power, 
 said hot coal as is mixed with and burned with the low excess air with an air coefficient α which can approach a value of 1; 
   step 3: wherein the boiler is provided on the lower part thereof with a coke removal chamber for coke dust refining and coke dust removal in accordance with coal quality and as desired, wherein the coke removal chamber for coke dust refining and coke dust removal is designed so as to interchange between the refining and the removal.   
     
     
         2 . A power generating method of carbon-molecule gasification combustion in accordance with  claim 1 , wherein the coke dust contains calcium from the desulfurization in the absence of air and can be used as the raw material of cement. 
     
     
         3 . The power generating method of Carbon-molecule gasification combustion in accordance with  claim 1 , wherein in the step 3,
 the coke removal chamber is provided on the too circumference thereof with an outer combustor which can turn on or off and adjust air to spray downward the heated coal gas and which can
 refine the coke dust with the effect of an impact drive force when an air valve of the outer combustor is turned off or 
 remove the dust by a clean combustion of the hot coal gas and the air cooperating with the hot coal gas and adjusted and supplied at any time as desired; 
 and wherein the outer combustor can be placed symmetrically on two sides or four sides of the boiler or furnace or on one side or three sides of the boiler of furnace. 
   
     
     
         4 - 6 . (canceled) 
     
     
         7 . The power generating method of carbon-molecule gasification combustion in accordance with  claim 1  wherein in the hot coal gas produced in step 1 can be used in various boilers or furnaces, or for producing a desired cold coal gas for use in gas inner combustion engines and gas turbines, or for producing a chemical raw material. 
     
     
         8 . A power generating method of Carbon-molecule gasification combustion in accordance with  claim 1 , wherein the following ratios are controlled so that the former is maximized and the latter is minimized:
     Q   energy of used coal /( Q   original total energy of coal   +Q   total consumed energy as utilizing coal )( B   pollutants discharging amount as utilizing coal   +B   controlled pollutants discharging total amount )/ B   total amount of original pollutants of coal .