| 摘要 |
A residual carbon analyser for a heating or power plant has an analyser tube (16), preferably of glass, in which an ash sample from the flue duct of the plant, e.g. via a cyclone, can be led through its one end, be deposited in the analyser tube (16) and after a measurement can be blown away or back to where it came from, and whereby an air blast cone (1) has been arranged in the other end of the analyser tube with its top directed upwardly towards the inner of the analyser tube (16), said top forming a bottom for the ash sample in the analyser tube (16) and being shaped as a top cone (3) with a relatively acute top angle, e.g. 40 DEG , and having a wall part of an annular passage or clearance (6) arranged at the lower end of the top cone (3), the largest diameter of said clearance wall part (6) being a minor percentage, e.g. 5,8 %, less than the inner diameter of the analyser tube (16), and which thus together with the analyser tube (16) forms an annular or ring shaped clearance or clearance, whereby the air blast cone (1) immediately below the wall part of the annular clearance (6) being shaped so that its wall parts together with the inner side of the analyser tube (16) form a downwardly closed annular chamber, to which pressurized air can be led in via one or more bores (4, 5 and 11) in the air blast cone (1), wherein said wall part (6) of the outer side of the air blast cone (1) forming the inner wall (6) of the annular clearance, is provided with a number of helical or inclined grooves or channels (2). |
