Fabric filter system and method for cleaning the same

Patent metadata

Field	Value
Publication number	US-9656200-B2
Application number	US-201514631116-A
Country	US
Kind code	B2
Filing date	Feb 25, 2015
Priority date	Feb 26, 2014
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

The invention relates to a fabric filter system, having a first fabric filtering device in the form of elongated tubular fabric bag; a first gas tank for providing compressed gas; a first pulsing gas duct fluidly connected between the first fabric filtering device and the first gas tank through a first pulsing valve for cleaning the first fabric filtering device. The fabric filter system further includes a second gas tank for providing compressed gas. The second gas tank is fluidly connected with the first gas tank through a control valve. The first pulsing valve is opened to introduce the compressed gas into the first filtering device for cleaning when the control valve remains open. The control valve is closed after a predetermined time. A method for cleaning the fabric filter system is disclosed.

First claim

The invention claimed is:

1. A fabric filter system, comprising:
a first fabric filtering device in the form of an elongated tubular fabric bag;
a first gas tank configured to provide compressed gas;
a first pulsing gas duct fluidly connected between the first fabric filtering device and the first gas tank with a first pulsing valve arranged in the first pulsing gas duct between the first fabric filtering device and the first gas tank for compressed gas flow from the first gas tank through the first pulsing valve and the first pulsing gas duct for cleaning the first fabric filtering device;
a second gas tank configured to provide compressed gas;
a second pulsing gas duct fluidly connected between a second fabric filtering device and the second gas tank with a second pulsing valve arranged in the second pulsing gas duct between the second fabric filtering device and the second gas tank for compressed gas flow from the second gas tank through the second pulsing valve and the second pulsing gas duct for cleaning the second fabric filtering device; and
a control valve arranged between the first gas tank and the second gas tank thereby fluidly connecting the first gas tank and the second gas tank when the control valve is opened, and fluidly isolating the first gas tank from the second gas tank when the control valve is closed;
wherein the first pulsing valve is configured to be opened to introduce the compressed gas into the first fabric filtering device via the first pulsing gas duct to clean the first fabric filtering device while the control valve fluidly connected to the second gas tank remains open for a predetermined time before closing.

2. The fabric filter system according to claim 1 , wherein the second fabric filtering device is in the form of an elongated tubular fabric bag, and the second pulsing gas duct is fluidly connected between the second fabric filtering device and the second gas tank with the second pulsing valve arranged in the second pulsing gas duct between the second fabric filtering device and the second gas tank for compressed gas flow from the second gas tank through the second pulsing gas duct and the second pulsing valve to clean the second fabric filtering device.

3. The fabric filter system according to claim 1 , wherein the predetermined time ranges within 2 ms to 2000 ms.

4. The fabric filter system according to claim 1 , wherein the predetermined time ranges within 20 ms to 500 ms.

5. The fabric filter system according to claim 1 , wherein the first and second gas tanks are configured such that compressed gas is introduced into the first and second gas tanks when the control valve is open.

6. The fabric filter system according to claim 5 , wherein the first pulsing valve is configured such that the first pulsing valve is opened to introduce the compressed gas into the first fabric filtering device for cleaning after the control valve is opened but when the second pulsing valve is closed.

7. The fabric filter system according to claim 1 , wherein the control valve is configured to be opened after a first period of time has elapsed since a last time the control valve was previously opened.

8. The fabric filter system according to claim 1 , wherein the control valve is configured to be opened when a pre-selected pressure drop in gas flow is measured between an inlet duct and an outlet duct of either the first fabric filter system or the second fabric filter system.

9. The fabric filter system according to claim 8 , wherein the inlet ducts are configured such that gas is passable into the first or second fabric filter system via the inlet duct associated therewith such that a first portion of the gas that passed through the inlet duct passes through the first or second fabric filtering device; and the outlet ducts are configured such that the first portion of the gas is output from the first or second fabric filter system after the first portion of the gas is passed through the first or second fabric filtering device.

10. The fabric filter system according to claim 1 , wherein the control valve is closed while the first pulsing valve remains open until the first gas tank is emptied to a pre-selected level during cleaning of the first fabric filtering device.

11. The fabric filter system according to claim 10 , wherein the pre-selected level of the first gas tank is a level at which the first gas tank has a pressure of 0.5 bar.

12. The fabric filter system according to claim 10 , wherein the first and second gas tanks are configured such that compressed gas is introduced into the first and second gas tanks when the control valve is open, the first pulsing valve is configured such that the first pulsing valve is opened to introduce the compressed gas into the first fabric filtering device for cleaning after the control valve is opened, the control valve is configured to be opened when a pre-selected pressure drop in gas flow is measured between the inlet duct of the first fabric filter system and the outlet duct of the first fabric filter system, the inlet duct being configured such that gas is passable into the first fabric filter system via the inlet duct such that a first portion of the gas that passed through the inlet duct passes through the first fabric filtering device, and the outlet duct being configured such that the first portion of the gas is output from the first fabric filter system after the first portion of the gas is passed through the first fabric filtering device.

13. The fabric filter system according to claim 12 , wherein the second pulsing valve is configured to be opened to introduce compressed gas into the second fabric filtering device for cleaning when the control valve is open and the first pulsing valve is closed.

14. The fabric filter system according to claim 13 , wherein the second fabric filter system is configured such that the second pulsing valve is configured to remain open after the control valve is closed until the second gas tank is emptied to a pre-selected level during cleaning of the second fabric filtering device.

Assignees

• Alstom Technology Ltd
• Geneal Electric Tech Gmbh

Inventors

• Hjelmberg Anders Erik Martin
• Moestam Per Robert

Classifications

• B01D46/023

  Pockets filters, i.e. multiple bag filters mounted on a common frame · CPC title

• B01D46/04 Primary

  Cleaning filters · CPC title

• B01D46/0068

  Operations & Transport · mapped topic

• B01D46/002

  Operations & Transport · mapped topic

• B01D46/71 Primary

  with pressurised gas, e.g. pulsed air · CPC title