Powder cleaning systems and methods

Patent metadata

Field	Value
Publication number	US-11097340-B2
Application number	US-201816194830-A
Country	US
Kind code	B2
Filing date	Nov 19, 2018
Priority date	Nov 19, 2018
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A powder cleaning system can include a fluidized bed reactor configured to retain powder and fluidize the powder to remove adsorbate and/or other contaminants from the powder, at least one inlet line, and one or more gas sources configured to be in selective fluid communication with the fluidized bed reactor via the at least one inlet line to selectively provide an inlet flow having one or more gases to the fluidized bed reactor to fluidize the powder with the one or more gases within the fluidized bed reactor. The system can include at least one outlet line in fluid communication with the fluidized bed reactor and configured to allow removal of outlet flow which comprises the adsorbate and/or other contaminants from the fluidized bed reactor.

First claim

What is claimed is:

1. A powder cleaning system, comprising:
a fluidized bed reactor configured to retain powder and fluidize the powder to remove adsorbate and/or other contaminants from the powder;
at least one inlet line;
one or more gas sources configured to be in selective fluid communication with the fluidized bed reactor via the at least one inlet line to selectively provide an inlet flow having one or more gases to the fluidized bed reactor to fluidize the powder with the one or more gases within the fluidized bed reactor;
at least one outlet line in fluid communication with the fluidized bed reactor and configured to allow removal of outlet flow which comprises the adsorbate and/or other contaminants from the fluidized bed reactor;
a bypass line configured to fluidly connect the inlet line and the liquid trap to allow at least some gas in the inlet line to flow to the vent, wherein the bypass line includes a bypass valve configured to selectively allow bypass flow; and
pressure release valve (PRV) disposed in the inlet line to allow bleeding of pressure above a threshold pressure, wherein the PRV is downstream of the bypass line.

2. The system of claim 1 , further comprising a filter for capturing particles, the filter disposed in the at least one outlet line.

3. The system of claim 2 , further comprising a liquid trap disposed downstream of the filter and configured to trap liquid entrained in the outlet flow.

4. The system of claim 3 , wherein the liquid trap includes a vent for venting gas of the outlet flow.

5. The system of claim 4 , wherein the inlet line includes at least one inlet line valve configured to selectively allow flow from the one or more gas sources to the fluidized bed reactor.

6. The system of claim 1 , further comprising a pressure sensor downstream of the PRV.

7. The system of claim 6 , wherein the at least one inlet line valve is downstream of the pressure sensor.

8. The system of claim 7 , wherein the one or more gas sources each include a source valve and a mass flow controller (MFC) for controlling an amount and/or proportion of each gas in the inlet flow.

9. The system of claim 8 , wherein the one or more gas sources can include at least one of an argon (Ar) source, an ammonia (NH 3 ) source, a nitrogen (N 2 ) source, a hydrogen (H 2 ) source or a helium (He) source.

10. The system of claim 1 , wherein the fluidized bed reactor includes an outer housing defining an outer space and a powder container disposed within the outer space and defining an inner space.

11. The powder container of claim 10 , further comprising a gas distributor plate between the outer space and the inner space at a bottom of the powder container, wherein the gas distributor plate includes a plurality of holes smaller than particles of the powder configured to prevent powder from falling through the gas distributor plate and to allow the inlet gas to pass therethrough into the powder within the powder container to fluidize the powder, wherein the inlet line is in fluid communication with the outer space and the outlet line is in fluid communication with the inner space such that inlet gas must flow through the gas distributor plate and fluidize the powder.

12. The system of claim 11 , further comprising a temperature sensor disposed in thermal communication with the outer space to sense a temperature of the inlet gas, and a temperature sensor in thermal communication with the outlet line to sense a temperature of the outlet gas.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Mcgee Randolph Carlton
• She Ying

Classifications

• B01J8/24 Primary

  according to "fluidised-bed" technique (B01J8/20 takes precedence) · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title

• B22F10/34

  of powder characteristics, e.g. density, oxidation or flowability · CPC title

• B22F1/14

  Treatment of metallic powder (mixing with lubricating or binding agents or with organic material B22F1/10) · CPC title

• B22F10/73

  of powder · CPC title