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ALUMINA/CARBOXYL METHYL CELLULOSE BED TO REMOVE MOISTURE CONTENT IN PRODUCER GAS

IP.com Disclosure Number: IPCOM000228008D
Publication Date: 2013-Jun-03
Document File: 3 page(s) / 208K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention relates to biomass gasification plant. Biomass gasification gas cleanup system has a system of chilled water scrubbers which reduces producer gas temperature to 20-25C. Three scrubbers are typically used in series and the third scrubber also removes moisture from gas to meet engine requirements. The invention proposes replacing the third stage chiller catalyst adsorbent, such as beds of carboxy methyl cellulose (CMC) on alumina, which reduces moisture in the gas to as low as 10 ppm. The adsorbent column would require regeneration periodically, during which time a standby adsorbent bed is used. This concept can reduce the auxiliary load of biomass plant by 50 - 60%, thereby improving energy efficiency, while eliminating requirement of a chiller, associated pump, cooling tower and scrubber.

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ALUMINA/CARBOXYL METHYL CELLULOSE BED TO REMOVE MOISTURE CONTENT IN PRODUCER GAS

BACKGROUND

The invention relates to biomass gasification plant. Biomass gasification gas cleanup system has a system of chilled water scrubbers which reduces producer gas temperature to 20-25°C. Three scrubbers are typically used in series and the third scrubber also removes moisture from gas to meet engine requirements. The temperature of gas coming out of the cooling water scrubber number 2 is around 50°C that is sufficient for engine inlet conditions, if moisture could be removed by other means. The power consumption of the last stage chiller contributes to around 50% in the total plant auxiliary load (for a MW, the chiller consumption remains around 60 - 70 KW) and therefore removing the third chiller would provide considerable energy savings. The invention presents a method of moisture removal from the producer gas using catalyst adsorbent beds.  

DRAWING

Alumina/carboxyl methyl cellulose bed to remove moisture content in producer gas is disclosed further with reference to the following drawing:

Figure 1 shows alumina/CMC bed to remove moisture content in producer gas in biomass gasification plant.

DETAILED DESCRIPTION

The invention proposes replacing the third stage chiller in the producer gas cooling system of biomass gasification plant by two beds of catalyst adsorbent. In one embodiment shown in Fig. 1, carboxy methyl cellulose (CMC) on alumina is used as adsorbent which reduces moisture in the gas to as low as 10 ppm. As the third chilled water scrubber is removed there may be potential carryover of solids and water, for which a knockout pot is provided as shown in Fig. 1, which ensures removal of carryover solids and tar from the producer gas.

The adsorbent column would require regeneration periodically, du...