Single longitudinal drum boiler is divided into two types: light-weight wall-mounted boilers and heavy-duty wall-mounted bulk boilers, all of which are composed of upper longitudinal drum, water-cooled wall tubes, convection tube bundles and left and right headers.
Structural features: the longitudinal drum boiler is longitudinally arranged in the center of the upper part of the furnace, and two sets of convection tube bundles and water wall tubes are arranged on both sides of the furnace respectively, which are symmetrical left and right, similar to the A-shape. The high-temperature flue gas enters the left convection flue from the left smoke outlet at the back of the furnace, passes through the transverse flue at the front end of the drum from back to front, bends into the right convection flue, and then flows to the economizer from front to back, and is discharged through the induced draft fan and chimney.
Single longitudinal drum boiler has the following advantages: using one drum saves steel;
The furnace body of longitudinal drum boiler is a-shaped, and the insulation layer on the top of the furnace is convenient to lay; There is no partition wall in the convection tube bundles on both sides, and the structure is simple. Disadvantages: the water capacity of a single drum is small, and the steam pressure and water level fluctuate greatly during operation; It requires high water supply quality and operation management level.
The structure of doublelongitudinal drum boiler is mainly composed of upper and lower longitudinal drums, convection tube bundles, water wall tubes, headers and downcomers. The length of the lower drum is about half shorter than that of the upper drum, and the empty space is provided with a furnace, a bent water pipe is arranged between the two drums, and water wall pipes are arranged around the furnace.
The upper and lower vertical drums have large water capacity and good adaptability to load changes; Convection tube bundles are all bent water tubes, and the structure is elastic; The furnace of longitudinal drum boiler is long and narrow, which is suitable for mechanized grate and has high thermal efficiency. Disadvantages: dust is easy to accumulate between convection tubes, and if it is not removed in time, the thermal efficiency will decrease; The quality of water supply is strict, otherwise the scale is not easy to remove.
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