G30 wood chip

[briquette_seller]

Looking at G30 wood chip, it seems to vary in size and shape, i thought G30 was meant to be all roughly the same size, with a surface area of 30mm square.

Does that make the overall size approx 6mm x 5mm?

Or do i have this all wrong?

[renewablejohn]

Here is a typical Spec sheet

 

http://www.uk.remeha.com/fileadmin/user_upload/Professional_Site_UK/Technical_Specifications/Generic_Wood_Chip_Specification.pdf

 

I have some customers who have G30 spec but with fines removed as it is better for their gasifiers.

Edited October 16, 2014 by renewablejohn

[rovers90]

Depends on the chipper the wood has gone through as well! My friend has had samples of G30 sent through that are mor elike G50 and yet the producer claims it is perfect G30.

[renewablejohn]

Depends on the chipper the wood has gone through as well! My friend has had samples of G30 sent through that are mor elike G50 and yet the producer claims it is perfect G30.

 

Sounds more like the guy could not be bothered taking out the 50mm screen and thought he could wing it as a 30mm sample.

[rovers90]

Sounds more like the guy could not be bothered taking out the 50mm screen and thought he could wing it as a 30mm sample.

 

Nope. My friend has had a few different companies in and they all had correct screens in but no one in his eyes produces a genuine G30 chip. Newest one was a brand new heizorhack that still produced a large amount of fines and oversize

[cornish wood burner]

There seems to be a lot of things that affect chip size as well as the screen. Engine power, infeed speed, stress control, blade sharpness, blade cutting edge angle, wood being chipped, moisture content, chipper clearances, wear and even the blower can beat the chip into smaller pieces. We had one chipper that produced a fairly good imitation of G30 through a 80 mm screen

[briquette_seller]

There seems to be a lot of things that affect chip size as well as the screen. Engine power, infeed speed, stress control, blade sharpness, blade cutting edge angle, wood being chipped, moisture content, chipper clearances, wear and even the blower can beat the chip into smaller pieces. We had one chipper that produced a fairly good imitation of G30 through a 80 mm screen

 

80mm screen? Holly crap......

 

I was advised to use a one inch baffled screen (belt discharge, not blown)

 

Massive difference....

[cornish wood burner]

80mm screen? Holly crap......

 

I was advised to use a one inch baffled screen (belt discharge, not blown)

 

Massive difference....

 

Yes but we were after G100. Chipper had a lot of things wrong I believe.

30 mm screen is used to produce G30 in most of the chippers I have come across.

[briquette_seller]

I see the problem with over sized material, but whats wrong with fines in wood chip?

[cornish wood burner]

I see the problem with over sized material, but whats wrong with fines in wood chip?

Depending on the feed system fines could cause a problem with chip flow or machinery if they build up.

Reduced air flow through the chip due to too many fines.

Fines becoming airboure and burning in the wrong place.

Its not a problem we have so others might add to this.