Method and system for coal purification and complete burning for clean fossil fuel

Abstract

In one aspect, a method for coal purification and gasification may include steps of heating the coal including various hydrocarbons and harmful substances such as sulfides, phosphates, etc. to 900 to 1200° C. in a coal gasifier; providing a reaction chamber with oxygen and connecting with the coal gasifier; the sulfides, phosphates, etc. in the gasified coal entering the reaction chamber from the coal gasifier and reacting with the oxygen therein; separating mixtures from the reaction chamber to collect hydrocarbons in its fluidized phase; heating the fluidized hydrocarbons; and providing oxygen to react with the gasified form of hydrocarbons to achieve a complete burning of the hydrocarbons.

What is claimed is: 
     
         1 . A method for coal purification and complete burning comprising steps of:
 (a) heating the coal in a solid form to a gasified form without air including various hydrocarbons and harmful substances to a predetermined range of temperature in a coal gasifier, and the temperature is controlled by a feedback control system;   (b) providing a reaction chamber with oxygen and connecting with the coal gasifier;   (c) separating the harmful substances from the hydrocarbons;   (d) condensing the gasified coal from the reaction chamber to collect hydrocarbons in its fluidized phase;   (e) heating the fluidized hydrocarbons to become a gasified form;   (f) providing oxygen to mix with the gasified form of the fluidized hydrocarbons; and   (g) igniting mixed hydrocarbons and oxygen to achieve complete burning.   
     
     
         2 . The method for coal purification and complete burning of  claim 1 , wherein harmful substances include sulfides and phosphates. 
     
     
         3 . The method for coal purification and complete burning of  claim 2 , wherein sulfides can be removed through a sulfonation process according to the formula below:
   2S+3O 2 =2SO 3   (i)
     C 6 H 6 +SO 3 =C 6 H 5 SO 3 H  (ii)
     C 6 H 5 SO 3 H+H 2 O=C 6 H 6 +H 2 SO 4   (iii)
   
     
     
         4 . The method for coal purification and complete burning of  claim 2 , wherein phosphates can be removed through a phosphoriation process according to the formula below:
   2P+3O 2 =2PO 3   (i)
     C 6 H 6 +PO 3 =C 6 H 5 PO 3 H  (ii)
     C 6 H 5 PO 3 H+H 2 O=C 6 H 6 +H 2 PO 4   (iii)
   
     
     
         5 . The method for coal purification and complete burning of  claim 1 , wherein carbon dioxide (CO 2 ) generated in the coal purification and complete burning is removed through the formula below:
   2CO 2 +2H 2 O+2CaO→2Ca(OH)CO 3 +H 2   (i)
   
     
     
         6 . The method for coal purification and complete burning of  claim 1 , wherein the fluidized hydrocarbons are positively charged and the oxygen is negatively charged. 
     
     
         7 . The method for coal purification and complete burning of  claim 1 , wherein the coal gasifier can be operated between 500 and 1500° C. 
     
     
         8 . The method for coal purification and complete burning of  claim 1 , wherein the feedback control system includes an electrical heater, a temperature sensing unit and a temperature control unit. 
     
     
         9 . The method for coal purification and complete burning of  claim 8 , wherein the temperature of electrical heater can be sensed or measured by the temperature sensing unit, which is configured to transmit a signal regarding the temperature of the electrical heater to the temperature control unit that is configured to control the temperature of the electrical heater. 
     
     
         10 . The method for coal purification and complete burning of  claim 5 , wherein the step (g) of igniting mixed hydrocarbons and oxygen to achieve complete burning heat may include a step of using the heat generated by reaction (i) can be used in step (g).