Chemical looping combustion method using dual metal compound oxide

Abstract

A chemical looping combustion method using a dual metal compound oxide includes the following steps: a fuel material combusting with the dual metal compound oxide in a first reactor to obtain a metal product; supplying the metal product obtained in the first reactor into a second reactor, and the metal product reacting with the air in the second reactor to obtain the dual metal compound oxide; and, supplying the dual metal compound oxide obtained in the second reactor into the first reactor. The dual metal compound oxide used in the chemical looping combustion process has high oxidation rate as well as high reduction rate so as to increase the efficiency of the chemical looping combustion process.

1 . A chemical looping combustion method using dual metal compound oxide, comprising the following steps of:
 supplying a dual metal compound oxide into a first reactor, wherein the dual metal compound oxide comprises an oxide of a first metal, an oxide of a second metal, and an oxide of a compound of the first metal and the second metal;   a fuel material combusting with the dual metal compound oxide in the first reactor to obtain a metal product and a gas;   supplying the metal product obtained in the first reactor into a second reactor;   the metal product reacting with the air in the second reactor to obtain the dual metal compound oxide; and   supplying the dual metal compound oxide obtained in the second reactor into the first reactor.   
     
     
         2 . The method of  claim 1 , wherein the dual metal compound oxide is a Fe—Ni compound oxide, and the metal product comprises iron, nickel, and a compound of iron and nickel. 
     
     
         3 . The method of  claim 2 , wherein the Fe—Ni compound oxide comprises Fe 2 O 3 , NiO, and NiFe 2 O 4 . 
     
     
         4 . The method of  claim 1 , further comprising the following steps of:
 mixing a metal salt of the first metal and a metal salt of the second metal uniformly in an aqueous solution to obtain a dual metal solution;   adding a water-soluble polymer into the dual metal solution to obtain a precipitate, and then drying the precipitate;   pulverizing and calcining the dried precipitate to obtain the dual metal compound oxide.   
     
     
         5 . The method of  claim 1 , wherein the temperature for calcining dried precipitate is in the range of 500° C. to 1600° C., and preferably 700° C. to 1100° C. 
     
     
         6 . The method of  claim 4 , wherein the dual metal compound oxide is a Fe—Ni compound oxide, the first metal is iron, the second metal is nickel, the metal salt of the first metal is ferric nitrate, the metal salt of the second metal is nickel nitrate, and the water-soluble polymer is polyethylene glycol. 
     
     
         7 . The method of claim  11 , wherein the fuel material is methane. 
     
     
         8 . The method of  claim 1 , further comprising the following steps of:
 loading the dual metal compound oxide on a carrier; and   supplying the dual metal compound oxide and the carrier into the first reactor.   
     
     
         9 . The method of  claim 1 , wherein the first reactor and the second reactor are fluidized bed reactors. 
     
     
         10 . The method of  claim 1 , further comprising the following steps of:
 drawing the gas from the first reactor;   condensing the gas to remove the water vapor from the gas; and   sealing and storing the condensed gas.