Method and device for reprocessing CO;containing exhaust gases
First Claim
1. A method for reprocessing CO2-containing exhaust gases in a multi-stage reduction process, the CO2-containing waste gas being conducted in a solid mass flow of bulk material, which cannot be gasified, and a thermally decomposable organic mass, through a plurality of zones to produce pyrolysis gases, said method comprising:
- a. thermally decomposing organic mass of a solid mass flow of bulk material under reducing conditions to form i) pyrolysis gases comprising short-chain hydrocarbons, hydrogen and carbon monoxide, along with ii) the creation of coke and a residue in a combustion gas generating stage;
b. performing oxidation of the coke in an intermediate stage at an increasing temperature, in which the carbon monoxide being created is drawn off opposite the direction of the solid mass flow in the direction of the combustion gas generating stage;
c. converting remaining coke residue, together with carbon dioxide, in a carbon monoxide generating stage at 800 to 1,600°
C. to carbon monoxide while adjusting the pressure and temperature in accordance with the Boudouard equilibrium;
d. cooling solid residue materials and coarse pieces of bulk material which was not gasified in a cooling stage in the CO2 counterflow to below 100°
C. and are moved out; and
e. returning at least the removed bulk material which was not gasified into the circulation after having been taken out.
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Abstract
The invention relates to a method for reprocessing CO2-containing exhaust gases in a multistage reduction process. The CO2-containing exhaust gas is conducted in the counter stream to a solid mass stream of inert bulk material and organic material that can be thermally decomposed through a plurality of zones (4, 3, 2, 1) into a pressure equalization region and is thereby converted into pyrolysis gases. In the flow direction of the solid mass stream in a fuel gas production stage (1) at 250-700° C., the organic matter is thermally decomposed under reducing conditions into short-chained hydrocarbons, hydrogen and carbon monoxide to produce coke and residue. In an intermediate stage (2) with increasing temperature, oxidation of the pyrolysis coke is carried out, wherein the developing carbon monoxide is suctioned off counter to the solid mass stream in the direction of the fuel gas production stage (1). In a carbon monoxide production stage (3) at 800-1,600° C., the remaining coke residue is converted with carbon dioxide into carbon monoxide by setting the pressure and temperature according to the Boudouard equilibrium. In a cooling stage (4), the developing solid residual material and the bulk material are cooled in the CO2 counter stream to below 100° C. and are separated, wherein the bulk material is returned to the cycle.
28 Citations
20 Claims
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1. A method for reprocessing CO2-containing exhaust gases in a multi-stage reduction process, the CO2-containing waste gas being conducted in a solid mass flow of bulk material, which cannot be gasified, and a thermally decomposable organic mass, through a plurality of zones to produce pyrolysis gases, said method comprising:
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a. thermally decomposing organic mass of a solid mass flow of bulk material under reducing conditions to form i) pyrolysis gases comprising short-chain hydrocarbons, hydrogen and carbon monoxide, along with ii) the creation of coke and a residue in a combustion gas generating stage; b. performing oxidation of the coke in an intermediate stage at an increasing temperature, in which the carbon monoxide being created is drawn off opposite the direction of the solid mass flow in the direction of the combustion gas generating stage; c. converting remaining coke residue, together with carbon dioxide, in a carbon monoxide generating stage at 800 to 1,600°
C. to carbon monoxide while adjusting the pressure and temperature in accordance with the Boudouard equilibrium;d. cooling solid residue materials and coarse pieces of bulk material which was not gasified in a cooling stage in the CO2 counterflow to below 100°
C. and are moved out; ande. returning at least the removed bulk material which was not gasified into the circulation after having been taken out. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification