An apparatus and method for particulate capture from gas streams and a method of removing soluble particulate from a gas
AssigneeStamicarbon B.V.
InventorBrian Sayre HIGGINS
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for the removal of soluble particulate matter from a gas stream, such as urea dust from the off-gas of a finishing section of a urea production plant. The method comprises subjecting the off-gas to at least two quenching stages an aqueous quenching liquid. The quenching liquid used in a first, upstream quench stage, is allowed to have a higher concentration of dissolved particulate matter than the quenching liquid in the second, downstream quench stage. The quenched gas is led through a particle capture zone, typically comprising one or more of a wet scrubber, a Venturi scrubber, and a wet electrostatic precipitator.
Claims20
A method for the removal of soluble particulate matter from a gas stream, the method comprising subjecting the gas stream to quenching with an aqueous quenching liquid and passing the quenched gas through at least one particle capture zone, wherein the gas stream is subjected to said quenching in at least two stages in series, using an upstream quenching liquid and a downstream quenching liquid, with the terms upstream and downstream being defined with reference to the flowing direction of the gas stream, wherein soluble particulate matter dissolves in the aqueous quenching liquid and wherein the downstream quenching liquid has a lower concentration of dissolved said particulate matter than the upstream quenching liquid.
A particle capture system comprising, in series, a gas inlet, a first quenching zone, a particle capture zone, and a gas outlet, the first quenching zone comprising a liquid inlet for the distribution of a quenching liquid, downstream thereof a gas flow-line to the particle capture zone, and a liquid outlet for the quenching liquid, said liquid inlet and outlet optionally forming part of a first recirculation loop for the quenching liquid, wherein downstream of the first quenching zone, and upstream of a gas outlet of the particle capture zone, at least a second quenching zone is provided, said second quenching zone having a liquid inlet and a liquid outlet for a quenching liquid, wherein the liquid inlet and outlet of the second quenching zone optionally form part of a second recirculation loop that can be operated independently of said first recirculation loop, the term downstream being defined with reference to the flowing direction of the gas stream.
A method of modifying an existing urea plant, said existing plant comprising a synthesis and recovery section;
- said section being in fluid communication with an evaporation section, said evaporation section being in fluid communication with a finishing section and having a gas flow line to a condensation section;
- said finishing section having a gas flow line to a dust scrubbing section, wherein the method comprises installing a first quenching system between the finishing section and the dust scrubbing section, said quenching system being in fluid communication with the gas flow line between the finishing section and the dust scrubbing section, and installing at least one second quenching system downstream of the first quenching system, wherein the first and second quenching systems each optionally form part of a recirculation loop that can be operated one independently of the other, the term downstream being defined with reference to the intended flowing direction of the gas stream from the finishing section to the dust scrubbing section.
Dependencies are inferred from the claim text.