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A New Concept for the Generation of Syn-Gas

IP.com Disclosure Number: IPCOM000031777D
Publication Date: 2004-Oct-09
Document File: 9 page(s) / 40K

Publishing Venue

The IP.com Prior Art Database

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A New Concept for the Generation of Syn-Gas

Summary:

A new concept for the generation of syn-gas (CO + H2) is proposed.  Relatively high purity syn-gas (as much as 91% syn-gas) is capable of being produced using this concept.  The concept uses a gas generator in conjunction with oxy-combustion to produce high quality syn-gas for use in the industry.  An additional embodiment with ASU integration is also proposed.  If implemented, the system removes the need for Steam Methane Reforming (SMR).  The concept is flexible in producing Syn-Gas, Power, Water etc.

Invention Summary:

A new concept for the generation of syn-gas (CO + H2) is discussed.  Relatively high purity syn-gas ( as much as 91% syn-gas) is capable of being produced using this concept.  The concept uses a gas generator in conjunction with oxy-combustion to produce high quality syn-gas for use in the industry.

 

Invention Description:

           

A gas generator can be used to produce high quality syn-gas in conjunction with oxygen and water under the right conditions.  Shown in Fig. 1 is a typical schematic on how this can be achieved.

Fig. 1 Schematic of the process for generation of syn-gas

Oxygen from an air separation unit is supplied to the gas generator along with fuel (natural gas, typically) and water in the right proportion to produce a gas that after combustion yields about 91% of syn-gas as shown in Table 1.  The oxygen concentration is kept below the stoichiometric amount to allow fuel rich conditions.  The system is optimized by varying the concentrations of fuel, oxygen and water to produce the highest concentration of syn-gas in the exit stream.  A chemical equilibrium and kinetics tool called CHEMKIN is used to compute and optimize the concentration of syn-gas in the flue gas.  Variation of syn-gas concentration with pressure is also shown below and it is seen that this concept is applicable irrespective of the pressure of operation. (Table A1)

The high concentration syn-gas from the gas generator is sent to a condensor where the water is condensed and recycled.  At this point there is a small amount of CO2 and CH4 in the stream that needs to be removed.  This is accomplished using a Pressure Swing Adsorption (PSA) unit at the end of which is obtained a very pure syn-gas stream with a CO:H2 concentration that can be varied by changing the inlet concentration ratios of fuel, oxygen and water depending on the requirement.  An already existing gas generator may be modified or used as is to generate the syn-gas as shown above.

 

4CASE A

2CASE C

1CASE D

6CASE I

XCH4

XO2 (initial)

XH2O

0.4

0.2

0.4

0.5

0.25

0.25

0.57

0.29

0.14

0.615

0.31

0.075

 

 

 

 

 

Pi (atm.)

1

1

1

1

Ti (K)

500

500

500

500

Po

(atm.)

1

1

1

1

To (K)

954

987

1020

1033

 

 

 

 

 

XH2

0.55

0.59

0.61

0.62

XH2O

0.19

0.11

0.07

0.044

XCH4

0.02

0.02

0.02

0.025

XCO

0.15

0.22

0.26

0.29

XCO2

0.09

0.06

0.04

0.025

6 has best H2 and CO conversion

Table 1.  Summary of calc...