Patent Publication Number: US-2012030999-A1

Title: Preparation and use method of coal carbon efficient energy-saving desulphurization additive

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS) 
     This application is related to co-pending Chinese Patent Application No. 200810238447.7, filed on Dec. 12, 2008, in the State Intellectual Property Office of the People&#39;s Republic of China, the entire content of which is incorporated herein by reference. 
     BACKGROUND 
     1. Field 
     The present invention relates to a method of preparation and application for high-efficiency and energy-saving desulfuration additive of coal, particularly to the methods which provide desulfuration, smoke abatement, dust removal and energy-saving in coal firing when the said additive is used. 
     2. Description of the Related Art 
     If firing coal in the existing boilers or kilns, it will generate a large amount of sulfur dioxide and nitrogen monoxide as well as smoke and dust, which pollutes the environment. Although a plurality of methods and approaches are available for eliminating smoke and dust, the effect is not quite satisfactory. Moreover, the existing firing process of coal leaves some unburned core and cinder, which leading to energy waste. 
     SUMMARY 
     The present invention is intended to provide a method of preparation and application for high-efficiency and energy-saving desulfuration additive of coal. While the coal is fired, the said method not only supports combustion to reduce coal consumption but also more effectively decreases harmful gases in the furnace by firing, removing and defusing impurities and harmful substances in the coal so that no harmful substances are formed and discharged, i.e. eliminating and defusing harmful substances from the source to meet the discharge standard for harmful substances. 
     The method of preparation for high-efficiency and energy-saving desulfuration additive of coal, which is characterized in that its components comprise the following materials by weight percentage: 
     30-40% ammonium perchlorate, 5-12% manganese carbonate, 5-12% zinc oxide, 10-23% sodium permanganate, 3-9% manganese dioxide, and 20-35% calcium phosphate primary. 
     The above materials are then mixed, broken up, and screened with sieve of 250-300 meshes. 
     The method of application for high-efficiency and energy-saving desulfuration additive of coal is characterized in that the above additive is fully mixed with coal for firing in furnace, wherein the weight ratio between the above additive and the coal is between 3 to 1000 and 8 to 1000. 
     The beneficial effect of the present invention is that the coal is fully burned and the utilization factor of coal resource improved, saving coal by up to 20%. Furthermore, harmful gases in coal are decreased during firing so that the discharged fume meets the national standard. Repeated tests and comparison monitoring indicate that the discharge amount of smoke and dust are reduced by 88%, Ringelmen blackness dropped to Grades 0-0.5, sulfur dioxide reduced by 85% and carbon monoxide by 35%, and the effect is better than the widely used desulfuration and dust-removing processes by physical and mechanical equipment at present. 
    
    
     DETAILED DESCRIPTION 
     The method of preparation for high-efficiency and energy-saving desulfuration additive of coal, wherein, its components comprise the following materials by weight percentage: 33% ammonium perchlorate, 8% manganese carbonate, 8% zinc oxide, 17% sodium permanganate, 6% manganese dioxide, and 28% calcium phosphate primary. 
     The method of application for high-efficiency and energy-saving desulfuration additive of coal is that the above additive is fully mixed with coal for firing in furnace, wherein the weight ratio between the above additive and the coal is between 3 to 1000 and 8 to 1000. 
     In the present invention, the ammonium perchlorate supports combustion and oxidation and contributes to full combustion of coal; manganese carbonate enables catalysis and desulfuration; zinc oxide absorbs carbon dioxide and water; sodium permanganate supports oxidation and eliminates harmful gases; and calcium phosphate primary suppresses the formation of sulfur dioxide and carbon monoxide when coal is fired. 
     Attached: Monitoring of smoke and dust before and after use of additive in coal (I) (by Environment Monitoring Station in Quanzhou, Fujian Province) 
     
       
         
           
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                 Analysis of coal-fired 
                 Analysis of coal-fired 
               
               
                 without additive: 
                 with additive: 
               
               
                   
               
             
            
               
                 Concentration of smoke and dust: 
                 Concentration of smoke and dust: 
               
               
                 1504 mg/m 3 , dry 
                 515 mg/m 3 , dry 
               
               
                 Ringelmen blackness: Grade 3.8 
                 Ringelmen blackness: Grade 0.4 
               
               
                 Sulfur dioxide: 152.9 mg/m 3 , dry 
                 Sulfur dioxide: 73.1 mg/m 3 , dry 
               
               
                   
               
            
           
         
       
     
     Monitoring of smoke and dust before and after use of additive in coal (II) (by Environment Monitoring Station in Quanzhou, Fujian Province) 
     
       
         
           
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 Analysis of coal-fired 
                 Analysis of coal-fired 
               
               
                 without additive: 
                 with additive: 
               
               
                   
               
             
            
               
                 Concentration of smoke and dust: 
                 Concentration of smoke and dust: 
               
               
                 2180 mg/m 3 , dry 
                 363 mg/m 3 , dry 
               
               
                 Ringelmen blackness: Grade 4.5 
                 Ringelmen blackness: Grade 0.5 
               
               
                 Sulfur dioxide: 355.6 mg/m 3 , dry 
                 Sulfur dioxide: 94.4 mg/m 3 , dry 
               
               
                   
               
            
           
         
       
     
     Monitoring of smoke and dust before and after use of additive in coal I (by Central Environment Monitoring Station in Xiamen) 
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 3 
               
               
                   
               
             
            
               
                   
                   
                   
                 Concentration 
                 Discharge of 
                 Ringelmen 
               
               
                   
                   
                 Sampling 
                 of smoke and 
                 smoke and 
                 blackness 
               
               
                 No. 
                 Measurement points 
                 frequency 
                 dust (mg/m 3 ) 
                 dust (kg/h) 
                 (Grade) 
               
               
                   
               
               
                 1 
                 Flue (before using 
                 1 
                 245.1 
                 0.52 
                 2 (10 min.) 
               
               
                   
                 of additive) 
               
               
                 2 
                   
                 2 
                 350.9 
                 0.66 
                 3 (20 min.) 
               
               
                   
                   
                   
                 Sulfur dioxide 
                 Nitrogen oxide 
               
               
                   
                   
                   
                 (mg/m 3 ) 
                 (mg/m 3 ) 
               
               
                 3 
                   
                 1 
                 3082 
                 71.4 
               
               
                 4 
                   
                 2 
                 (1079 ppm) 
                 37.6 
               
               
                   
               
               
                   
                   
                   
                 Concentration 
                 Discharge of 
                 Ringelmen 
               
               
                   
                   
                   
                 of smoke and 
                 smoke and 
                 blackness 
               
               
                   
                   
                   
                 dust (mg/m 3 ) 
                 dust (kg/h) 
                 (Grade) 
               
               
                   
               
               
                 5 
                 Flue (after using 
                 1 
                 63.5 
                 0.22 
                 0.5 (60 min.) 
               
               
                   
                 of additive) 
               
               
                 6 
                   
                 2 
                 64.9 
                 0.17 
               
               
                   
                   
                   
                 Sulfur dioxide 
                 Nitrogen oxide 
               
               
                   
                   
                   
                 (mg/m 3 ) 
                 (mg/m 3 ) 
               
               
                 7 
                   
                 1 
                 1062 
                 1.06 
               
               
                 8 
                   
                 2 
                 (372 ppm) 
                 0.85 
               
               
                   
               
            
           
         
       
     
     In view of the foregoing, an embodiment of the present invention provides and relates to a method of preparation for high-efficiency and energy-saving desulfuration additive of coal, which is characterized in that its components comprise the following materials by weight percentage: 30-40% ammonium perchlorate, 5-12% manganese carbonate, 5-12% zinc oxide, 10-23% sodium permanganate, 3-9% manganese dioxide, and 20-35% calcium phosphate primary. The above materials are mixed and broken up, and screened with sieve of 250-300 meshes. Also, an embodiment of the present invention provides and relates to a method of application for high-efficiency and energy-saving desulfuration additive of coal is characterized in that the above additive is fully mixed with coal for firing in furnace, wherein the weight ratio between the above additive and the coal is between 3 to 1000 and 8 to 1000. While the coal is fired, the invention not only supports combustion to reduce coal consumption but more effectively decreases harmful gases in the furnace by firing, removing and defusing impurities and harmful substances in the coal so that no harmful substances are formed and discharged, i.e. eliminating and defusing harmful substances from the source to meet the discharge standard for harmful substances. 
     While the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, and equivalents thereof.