| 摘要 |
In this disclosure is shown a natural circulation type waste heat boiler (1), preferably a steam boiler, which recovers the thermal energy in exhaust gases from a Diesel engine or the like, and the output of which is variable. The output is controlled by moving the water level (37) in the water tube constructions of convection part (31). The change in boiler output is due to the different heat transfer characteristics of water and steam, even though the quantity of exhaust gas flowing in the convection part (31) remains unchanged. The exhaust flow velocity is chosen such that it is sufficiently high for keeping the boiler clean. The valve (4) and/or the pump (5) controls the feed water flow (3) to the steam cylinder (2), wherein a guide plate (11) is provided on the partition (10) for augmenting the heat exchange between steam (9) and feed water (7). The steam cylinder (2) and the lower end of the convection part (31) are directly connected by means of at least one drain pipe (30). Flooding of the waste heat boiler (1) is prevented by means of a high water level control (16) provided in the lower part of the steam cylinder (2). |
