US 12,391,594 B2 · Method and slurry treatment plant for reducing methane emission from slurry produced in a livestock farm

Abstract

Disclosed is a method for reducing methane emission from slurry (2) produced in a livestock farm (1). The method comprises the steps of guiding the slurry (2) from the livestock farm (1) to a dewatering unit (12) in which the slurry (2) is at least partially dewatered by extracting a watery fraction of said slurry (13), guiding the slurry from the dewatering unit (12) to a steam dryer (3), drying the slurry in the steam dryer (3), guiding the dried slurry (4) into a pyrolysis reactor (5) to produce pyrolysis gas (6) and biochar (7) through a pyrolysis process in the pyrolysis reactor (5), guiding at least a portion of the pyrolysis gas (6) to a combustion unit (8) in which the pyrolysis gas portion is combusted to raise the temperature of the combusted pyrolysis gas (9), guiding the combusted pyrolysis gas (9) to the pyrolysis reactor (5) to drive the pyrolysis process, guiding the combusted pyrolysis gas (9) from the pyrolysis reactor (5) to the steam dryer (3) to increase the temperature of steam (10) in the steam dryer (3), and heating the watery fraction of the slurry 13 to a temperature at least above 75° Celsius by means of the steam (10) from said steam dryer (3). Furthermore, a slurry treatment plant (20) for reducing methane emission from slurry (2) is disclosed.

Claims20

Dependent claims

A method for reducing methane emission from slurry produced in a livestock farm, said method comprising the steps of:

providing at least partially dewatered slurry by guiding said slurry from said livestock farm to a dewatering unit in which said slurry is at least partially dewatered by extracting a watery fraction of said slurry,
guiding said at least partially dewatered slurry from said dewatering unit to a steam dryer,
providing dried slurry by drying said at least partially dewatered slurry in said steam dryer,
guiding said dried slurry into a pyrolysis reactor to produce pyrolysis gas and biochar through a pyrolysis process in said pyrolysis reactor,
guiding at least a portion of said pyrolysis gas to a combustion unit in which said at least portion of said pyrolysis gas is combusted to produce a combusted pyrolysis gas and raise the temperature of said combusted pyrolysis gas,
guiding said combusted pyrolysis gas to said pyrolysis reactor to drive said pyrolysis process,
guiding said combusted pyrolysis gas from said pyrolysis reactor to said steam dryer to increase a temperature of steam in said steam dryer, and
transporting said extracted watery fraction of said slurry to a slurry heating system and heating said extracted watery fraction of said slurry in the slurry heating system to a temperature of above 75° Celsius by means of steam from said steam dryer in the step of drying said at least partially dewatered slurry in said steam dryer.

5 more elements

A slurry treatment plant for reducing methane emission from slurry produced in a livestock farm, said slurry treatment plant comprising:

a dewatering unit arranged to receive slurry from said livestock farm and arranged to at least partially dewater said slurry by extracting a watery fraction of said slurry,
a steam dryer arranged to receive the at least partially dewatered slurry from said dewatering unit and arranged to reduce the water content of said received at least partially dewatered slurry further by exposing said slurry to steam to produce dried slurry,
a pyrolysis reactor arranged for receiving and pyrolyzing said dried slurry, wherein said pyrolysis reactor comprises a transporter arranged for transporting said dried slurry through said pyrolysis reactor to transform said dried slurry into pyrolysis gas and biochar,
a combustion unit arranged for combustion of said pyrolysis gas to produce combusted pyrolysis gas,
a first pyrolysis gas conduit arranged to guide combusted pyrolysis gas to said pyrolysis reactor to drive a pyrolysis process of said pyrolysis reactor,
a second pyrolysis gas conduit arranged to guide combusted pyrolysis gas to said steam dryer to increase the temperature of steam in said steam dryer
a slurry heating system arranged to receive said watery fraction of said slurry from said dewatering unit and arranged to receive steam from said steam dryer, wherein said slurry heating system is further arranged to heat said watery fraction of said slurry to a temperature above 75° Celsius by means of said steam from said steam dryer.

4 more elements

Dependencies are inferred from the claim text.

Method and slurry treatment plant for reducing methane emission from slurry produced in a livestock farm

Life of this patent

Method and slurry treatment plant for reducing methane emission from slurry produced in a livestock farm

Life of this patent

Abstract

Claims20