1. Severe scale buildup.
Method: Open the manhole, crawl into the bottom of the boiler drum to scrape off thick scale, and clean the pipe scale with a pipe cleaning device (electric pipe cleaner). Then, boil the boiler with sodium carbonate and trisodium phosphate (3 kg each for one ton of water), followed by rinsing with clean water. If the scale remains severe, perform an acid wash and then a pressure test.
2. The boiler is operating at positive pressure.
Inspect boilers and flues for air leaks causing smoke short-circuit, and seal them.
Boiler output is low (unable to reach adequate steam pressure).
Check the flame and furnace temperature; the volatile matter of the coal should be greater than 25%, the lower calorific value should be greater than 4500 BTU, the moisture content between 8-10%, the coal bed thickness (10-15 cm), grate speed (200-800 rpm), and the blower should be properly adjusted.
②The furnace wall collapsed, causing a short circuit of smoke and significant heat loss. (When the furnace wall collapses or refractory bricks fall, instruct the bricklayer to clean up the collapsed area, wet it with water, and then use refractory bricks, refractory cement, and pre-cut refractory materials.)
③ Severe scale buildup or excessive ash on the exterior of the boiler or in the water and fire tubes leads to poor heat transfer.
④ Poor insulation performance of boilers and pipelines. Insulation should be carried out as required.
⑤If there is too much fly ash or if the slagging tendency of the coal is too strong, increase the blower to one size larger. Vertical furnaces over half a ton require a 3KW blower (airflow over 2000 cubic meters, pressure over 1 MPa).
News Center Co., Ltd.
