Process for pneumatically conveying a powdery material

Patent metadata

Field	Value
Publication number	US-11067273-B2
Application number	US-202016788788-A
Country	US
Kind code	B2
Filing date	Feb 12, 2020
Priority date	Nov 28, 2016
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

Process and device for pneumatically conveying a powdery material comprising the steps of
Pneumatically conveying a powdery material in a pneumatic conveying pipeline (first) and into said recipient by a flow generated by a blower, A powdery material dosing step, A fluctuation step of pressure drop in said pneumatic conveying pipeline or up to said recipient,

wherein a sonic device generates sonic waves inside said pneumatic conveying pipeline or up to said recipient and provides a counteraction on the fluctuation step of the pressure drop in said pneumatic conveying pipeline or up to said recipient.

First claim

The invention claimed is:

1. Device for improving capture of polluting compounds from flue gases comprising
a furnace or combustion chamber provided for burning fuel and/or a material to be burned or heated or melted and producing flue gases, said furnace or combustion chamber being connected to a flue gas duct where flue gases generated in said furnace or combustion chamber are directed,
a powdery sorbent storage tank connected to said flue gas duct by means of a first pneumatic conveying pipeline, said first pneumatic conveying pipeline being further connected to a blower provided for pneumatically conveying said powdery sorbent from said powdery sorbent storage tank in said first pneumatic conveying pipeline to said flue gas duct, said first pneumatic conveying pipeline comprising a pipeline wall and being connected to said flue gas duct, said blower being provided to generate a flow of conveying fluid inside said first pneumatic conveying pipeline in which particles of said powdery sorbent are transported,
a powdery sorbent dosing means provided for dosing an amount of said powdery sorbent when entering from said powdery sorbent storage tank into said first pneumatic conveying pipeline, said first pneumatic conveying pipeline being connected to said powdery sorbent storage tank through said dosing means,
a controlling device for adjusting said amount of powdery sorbent in response to a first signal, characterized in that it further comprises a sonic device connected to said first pneumatic conveying pipeline and provided to generate sonic waves inside said first pneumatic conveying pipeline and/or up to said flue gas duct, said sonic device being further provided to counteract on a fluctuation step of the pressure drop in said first pneumatic conveying pipeline and/or up to said flue gas duct,
wherein the sonic device provided to generate sonic waves is an infrasound device provided to generate infrasonic waves;
wherein said infrasound device comprises a first and a second chamber, both first and second chamber being connected to each other by a tube, said first chamber comprising an exciter located inside said first chamber, provided to generate said infrasonic waves by providing infrasound pulses to a first portion of said conveying fluid which is blown inside said first chamber, said generated infrasonic waves being transported through the tube acting as a resonance pipeline to reach the second chamber; and
wherein the device further comprises a flowrate distributor pipe which is provided for deriving a second portion of said conveying fluid blown by said blower and introducing said second portion of said conveying fluid inside said second chamber while said first portion of said conveying fluid is transported through said tube from said first chamber to said second chamber.

2. Device for improving capture of polluting compounds from flue gases according to claim 1 , further comprising a mixing or connecting device located between said dosing means and said first pneumatic conveying pipeline, provided to mix said powdery sorbent in said conveying fluid.

3. Device for improving capture of polluting compounds from flue gases according to claim 1 , further comprising a cooling device located between said blower and said first pneumatic conveying pipeline.

4. Device for improving capture of polluting compounds from flue gases according to claim 1 , wherein said sonic device is connected to said blower and to the first pneumatic conveying pipeline.

5. Device for improving capture of polluting compounds from flue gases according to claim 1 , wherein said sonic device is connected to a second blower and to the first pneumatic conveying pipeline between the powdery sorbent storage tank and the flue gas duct.

6. Device for improving capture of polluting compounds from flue gases according to claim 1 , wherein said sonic device is connected to a second blower and to the first pneumatic conveying pipeline between the powdery sorbent storage tank and the blower.

7. Device for improving capture of polluting compounds from flue gases according to claim 1 , further comprising an adjustable flowrate distributor pipe connected at a first end either to the blower, between the blower and the first chamber or to the first chamber, preferably to the first compartment of the first chamber and at a second end to the second chamber, said adjustable flowrate distributor pipe being provided for deriving a portion of said conveying fluid blown by the blower and introducing it inside the second chamber.

8. Device for improving capture of polluting compounds from flue gases according to claim 1 , wherein the powdery sorbent storage tank is a powdery sorbent storage tank of powdery sorbent selected from the group consisting of hydrated lime, hydrated or semi-hydrated dolime, limestone, dolomite, quick lime, quick dolime, sodium carbonate or bicarbonate, sodium sesquicarbonate dihydrate, halloysite, sepiolite, a carbonaceous organic compound selected from active carbon and lignite coke, fly ash or a mixture of any of these compounds.

9. Device for improving capture of polluting compounds from flue gases according to claim 1 , wherein said conveying fluid is air, inert gas, exhaust gases, or mixture thereof.

10. Device for improving capture of polluting compounds from flue gases according to claim 1 , further comprising an Helmholtz bass trap connected to said first chamber or preferably on the pipeline between the blower and the first chamber, provided to prevent infrasonic waves transported inside said first pneumatic conveying pipeline during said transport of powdery sorbent to reach the blower.

11. Device for improving capture of polluting compounds from flue gases according to claim 1 , comprising an emergency device having a first position being an emergency position and a second position being an operating position, said emergency device comprising a switch connected to an emergency pipe connecting directly the blower to the first pneumatic conveying pipeline, downstream the infrasound device, said emergency position being a position wherein the switch prevents the blown conveying fluid from entering said first chamber and diverting it directly to said first pneumatic conveying pipeline, downstream the infrasound device and wherein the operating position is a position wherein the blown conveying fluid is provided at least partially to said first chamber.

12. Device for improving capture of polluting compounds from flue gases according to claim 1 , wherein said first signal is such as wind speed of environment at the outlet of the chimney, atmospheric pressure of environment at the outlet of the chimney or outside said flue gas duct, temperature of the flue gas, nature of the fuel, sulfur content of the fuel, sulfur content of the flue gas, chloride content of the flue gas, mercury content of the flue gas, chloride content of material to be burned or to be heated or melted, sulfur content of material to be burned or to be heated or melted, mercury content of material to be burned or to be heated or melted, and their combination.

13. Device for improving capture of polluting compounds from flue gases according to claim 1 , wherein said dosing means is selected from a dosing screw, a rotating valve with a vertical shaft or an horizontal shaft, an air slide, a jet feeder, a screw-feeder, an airlock-feeder, a screw pump, a pressure vessel, an air lift, said dosing means being located between said powdery sorbent storage tank and said first pneumatic conveying pipeline being provided to be contacted by sonic waves transported inside said first pneumatic conveying pipeline during said transport o

Assignees

• Lhoist Rech Et Developpement Sa

Inventors

• Baquet Hugues
• Heiszwolf Johan
• Letouzey Joel
• Lyons David
• METZ Chad Timothy
• FITZGERALD Howard Braxton
• Filippelli Gregory M

Classifications

• F23J7/00 Primary

  Arrangement of devices for supplying chemicals to fire · CPC title

• B65G53/521

  means for preventing the accumulation or for removal of deposits (preventing accumulation in pipes in general F16L55/24) · CPC title

• F23J15/006

  Layout of treatment plant · CPC title

• F23J15/003 Primary

  for supplying chemicals to fumes, e.g. using injection devices · CPC title