Under 4 different conditions (the smallest air door αpy =1.60, the smaller air door αpy =2.20, the larger air door αpy =3.16 and the largest air door αpy =4.41), the double fire grates boiler designed by the author have been tested. The corresponding result is that the temperature distribution appears similar law in height, depth and width. Secure, stabile and economical operation of the boiler has been realized on the better work state (between condition 2 and condition 3). It will be an important type of straw briquette boiler. It lays foundation for optimization design of burning equipment and running adjustment.
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