Apparatus for producing a pyrolysis product

Abstract

The invention relates to an apparatus for producing a pyrolysis product, the apparatus comprising a pyrolysis reactor for forming pyrolysis product fractions from raw material by fast pyrolysis, a condensing device for condensing gaseous pyrolysis product fractions to mainly liquid pyrolysis product fractions, a combustion boiler arranged in conjunction with the pyrolysis reactor for forming energy fractions, and feeding devices for feeding raw materials to the pyrolysis reactor and the combustion boiler. According to the invention, the apparatus comprises a separating device arranged substantially in conjunction with the pyrolysis reactor for separating other fractions from the gaseous pyrolysis product fractions after the pyrolysis and means for conducting other fractions than the gaseous pyrolysis product fractions from the separator to the combustion boiler.

1 . An apparatus for producing a pyrolysis product, the apparatus comprising
 a pyrolysis reactor for forming pyrolysis product fractions from raw material by fast pyrolysis,   a condensing device for condensing gaseous pyrolysis product fractions to mainly liquid pyrolysis product fractions,   a combustion boiler for forming energy product fractions, the pyrolysis reactor being arranged in conjunction with the combustion boiler,   means for circulating the heat transfer material that is heated in the combustion boiler from the combustion boiler to the pyrolysis reactor,   feeding devices for feeding raw materials to the pyrolysis reactor and the combustion boiler, and   means for feeding carrier gas to the pyrolysis reactor,   
       wherein the apparatus comprises
 means for feeding the carrier gas including oxygen to the pyrolysis reactor for performing the pyrolysis in the pyrolysis reactor in the presence of oxygen in order to improve stability of the liquid pyrolysis product. 
 
     
     
         2 . The apparatus according to  claim 1 , wherein the apparatus comprises means for adding oxygen to the carrier gas for increasing the oxygen content of the carrier gas. 
     
     
         3 . The apparatus according to  claim 1 , wherein the apparatus comprises means for forming the carrier gas which contains oxygen from the combustion gas of the combustion boiler and means for circulating the carrier gas to the pyrolysis reactor. 
     
     
         4 . The apparatus according to  claim 3 , wherein the apparatus comprises a device for purifying the combustion gas. 
     
     
         5 . The apparatus according to  claim 1 , wherein the carrier gas contains oxygen in an amount of 1 to 7% by volume. 
     
     
         6 . The apparatus according to  claim 1 , wherein the apparatus comprises a separating device for separating other fractions than gaseous pyrolysis product fractions from the gaseous pyrolysis product fractions after the pyrolysis. 
     
     
         7 . The apparatus according to  claim 1 , wherein the apparatus comprises means for conducting the solids containing flow including solids and heat transfer material from the separating device to the combustion boiler. 
     
     
         8 . The apparatus according to  claim 1 , wherein the apparatus comprises means for mixing the raw material of the pyrolysis reactor with the carrier gas to form a mixture and means for conducting the heated heat transfer material from the combustion boiler to the mixture of the raw material of the pyrolysis reactor and the carrier gas in the pyrolysis reactor. 
     
     
         9 . The apparatus according to  claim 1 , wherein the heat transfer material is selected from the group comprising sand, bed sand, aluminum oxide based material, other fluidization material or the like 
     
     
         10 . The apparatus according to  claim 1 , wherein the heat transfer material is bed sand. 
     
     
         11 . The apparatus according to  claim 1 , wherein the apparatus comprises a heat exchanger for adjusting the temperature of the heat transfer material before the pyrolysis reactor. 
     
     
         12 . The apparatus according to  claim 1 , wherein the feeding device is arranged to feed raw materials selected from the group comprising a wood-containing material, residuals from the forest industry and/or biomass to the pyrolysis reactor. 
     
     
         13 . The apparatus according to  claim 1 , wherein the feeding device is arranged to feed raw materials selected from the group comprising residuals from the forest industry, bark-containing material, peat, coal, lignite, oil shale and a multi-fuel mixture to the combustion boiler. 
     
     
         14 . A method for producing a pyrolysis product, the method comprising
 feeding raw materials to a pyrolysis reactor and a combustion boiler, the pyrolysis reactor being arranged in conjunction with the combustion boiler,   forming pyrolysis product fractions from raw material by fast pyrolysis in the pyrolysis reactor,   condensing gaseous pyrolysis product fractions to mainly liquid pyrolysis product fractions,   forming energy product fractions in the combustion boiler,   heating heat transfer material in the combustion boiler and circulating the heat transfer material from the combustion boiler to the pyrolysis reactor, and   feeding carrier gas to the pyrolysis reactor,   
       wherein the method comprises
 feeding the carrier gas including oxygen to the pyrolysis reactor and performing the pyrolysis in the pyrolysis reactor in the presence of oxygen in order to improve stability of the liquid pyrolysis product. 
 
     
     
         15 . The method according to  claim 14 , wherein the method comprises
 adding oxygen to the carrier gas for increasing the oxygen content of the carrier gas.   
     
     
         16 . The method according to  claim 14 , wherein the method comprises
 forming the carrier gas which contains oxygen from the combustion gas of the combustion boiler and circulating it to the pyrolysis reactor.   
     
     
         17 . The method according to  claim 14 , wherein the carrier gas contains oxygen in an amount of 1 to 7% by volume. 
     
     
         18 . The method according to  claim 14 , wherein the method comprises
 mixing the raw material of the pyrolysis reactor with the carrier gas to form a mixture and conducting the heated heat transfer material from the combustion boiler to the mixture of the raw material of the pyrolysis reactor and the carrier gas in the pyrolysis reactor.