Wan Wang Peng

US Patent:

8303696, Nov 6, 2012

Filed:

Jul 9, 2010

Appl. No.:

12/833023

Inventors:

Pannalal Vimalchand - Birmingham AL, US
Guohai Liu - Birmingham AL, US
Wan Wang Peng - Birmingham AL, US

Assignee:

Southern Company - Birmingham AL

International Classification:

B01D 53/08
B01D 53/12

US Classification:

96123, 96135, 96150, 95108, 95139

Abstract:

Disclosed are apparatus and method to treat large amounts of flue gas from a pulverized coal combustion power plant. The flue gas is contacted with solid sorbents to selectively absorb CO, which is then released as a nearly pure COgas stream upon regeneration at higher temperature. The method is capable of handling the necessary sorbent circulation rates of tens of millions of lbs/hr to separate COfrom a power plant's flue gas stream. Because pressurizing large amounts of flue gas is cost prohibitive, the method of this invention minimizes the overall pressure drop in the absorption section to less than 25 inches of water column. The internal circulation of sorbent within the absorber assembly in the proposed method not only minimizes temperature increases in the absorber to less than 25 F. , but also increases the COconcentration in the sorbent to near saturation levels. Saturating the sorbent with COin the absorber section minimizes the heat energy needed for sorbent regeneration.

US Patent:

8308836, Nov 13, 2012

Filed:

Apr 20, 2009

Appl. No.:

12/426700

Inventors:

Guohai Liu - Birmingham AL, US
Wan Wang Peng - Birmingham AL, US
Pannalal Vimalchand - Birmingham AL, US

Assignee:

Southern Company - Birmingham AL

International Classification:

B01D 46/30

US Classification:

55517, 553151, 55319, 55516, 422145

Abstract:

A system for depressurizing and cooling a high pressure, high temperature dense phase solids stream having coarse solid particles with entrained gas therein. In one aspect, the system has an apparatus for at least partially depressurizing and cooling the high pressure, high temperature dense phase solids stream having gas entrained therein and a pressure letdown device for further depressurization and separating cooled coarse solid particles from a portion of the entrained gas, resulting in a lower temperature, lower pressure outlet of solid particles for downstream processing or discharge to a storage silo for future use and/or disposal. There are no moving parts in the flow path of the solids stream in the system.

US Patent:

20080216655, Sep 11, 2008

Filed:

Mar 9, 2007

Appl. No.:

11/684405

Inventors:

Pannalal Vimalchand - Birmingham AL, US
Guohai Liu - Birmingham AL, US
Wan Wang Peng - Birmingham AL, US

International Classification:

B01D 45/12

US Classification:

95271, 422144

Abstract:

The system of the present invention comprises a centripetal cyclone for separating particulate material from a particulate laden gas solids stream. The cyclone comprises a housing defining a conduit extending between an upstream inlet and a downstream outlet. In operation, when a particulate laden gas-solids stream passes through the upstream housing inlet, the particulate laden gas-solids stream is directed through the conduit and at least a portion of the solids in the particulate laden gas-solids stream are subjected to a centripetal force within the conduit.

US Patent:

20100263342, Oct 21, 2010

Filed:

Apr 20, 2009

Appl. No.:

12/426669

Inventors:

Guohai Liu - Birmingham AL, US
Wan Wang Peng - Birmingham AL, US
Pannalal Vimalchand - Birmingham AL, US

International Classification:

B01D 46/00

US Classification:

55474

Abstract:

A system for depressurizing and cooling a high pressure, high temperature fine solid particles stream having entrained gas therein. In one aspect, the system has an apparatus for cooling the high pressure, high temperature fine solid particles stream having entrained gas therein and a pressure letdown device for depressurization by separating the cooled fine solid particles from a portion of the fine solid particles stream having entrained gas therein, resulting in a lower temperature, lower pressure outlet of solid particles for disposal or handling by downstream equipment.

US Patent:

20110146152, Jun 23, 2011

Filed:

Dec 16, 2010

Appl. No.:

12/969997

Inventors:

Pannalal Vimalchand - Birmingham AL, US
Guohai Liu - Birmingham AL, US
Wan Wang Peng - Birmingham AL, US

International Classification:

C10J 3/48
B01J 7/00

US Classification:

48 61, 48197 R

Abstract:

The improvements proposed in this invention provide a reliable apparatus and method to gasify low rank coals in a class of pressurized circulating fluidized bed reactors termed “transport gasifier.” The embodiments overcome a number of operability and reliability problems with existing gasifiers. The systems and methods address issues related to distribution of gasification agent without the use of internals, management of heat release to avoid any agglomeration and clinker formation, specific design of bends to withstand the highly erosive environment due to high solid particles circulation rates, design of a standpipe cyclone to withstand high temperature gasification environment, compact design of seal-leg that can handle high mass solids flux, design of nozzles that eliminate plugging, uniform aeration of large diameter Standpipe, oxidant injection at the cyclone exits to effectively modulate gasifier exit temperature and reduction in overall height of the gasifier with a modified non-mechanical valve.

US Patent:

20110146153, Jun 23, 2011

Filed:

Dec 16, 2010

Appl. No.:

12/970006

Inventors:

Pannalal Vimalchand - Birmingham AL, US
Wan Wang Peng - Birmingham AL, US
Guohai Liu - Birmingham AL, US

International Classification:

C10J 3/68

US Classification:

48 77, 48210

Abstract:

A coal feed system to feed pulverized low rank coals containing up to 25 wt % moisture to gasifiers operating up to 1000 psig pressure is described. The system includes gas distributor and collector gas permeable pipes imbedded in the lock vessel. Different methods of operation of the feed system are disclosed to minimize feed problems associated with bridging and packing of the pulverized coal. The method of maintaining the feed system and feeder device exit pressures using gas addition or extraction with the pressure control device is also described.

US Patent:

20150044014, Feb 12, 2015

Filed:

Sep 17, 2014

Appl. No.:

14/488323

Inventors:

- Birmingham AL, US
Guohai Liu - Birmingham AL, US
Wan Wang Peng - Birmingham AL, US

International Classification:

B01J 3/02
C10J 3/50
C10J 3/30

US Classification:

414805

Abstract:

A coal feed system to feed pulverized low rank coals containing up to 25 wt % moisture to gasifiers operating up to 1000 psig pressure is described. The system includes gas distributor and collector gas permeable pipes imbedded in the lock vessel. Different methods of operation of the feed system are disclosed to minimize feed problems associated with bridging and packing of the pulverized coal. The method of maintaining the feed system and feeder device exit pressures using gas addition or extraction with the pressure control device is also described.