SZL series vertical dual drums chain grate water tube hot water boiler, adopts quick fitting and assembly structure.The 4-6t/h boiler is of quick fitting tube structure, exit shop after completely assembled, the boiler of 6-35t/h is composed of 2 main components. The upper assembled component is the boiler proper heat absorbing part, and the lower assembled component is of combustion equipment. The former part of the boiler proper is arranged a membrane wall, the upper part of it is connected to boiler cylinder, and its lower part is connected to collective chest, so as to form a combustion room and absorb the radiated heat from the furnace. Its rear part is arranged with dense convection tubes between upper and lower boiler cylinders. The high temperature smog after combustion shall stand for twice returning flushing transversely to the heat accepting surfaces, and shall be introduced to coal saver singly arranged, and flow into duster and exhausted from chimney in the end.
CNC manufacturing technology
- ● The key processing technologies such as steel plate blanking, circling, drum and tube plate drilling adopt advanced CNC machining to reduce the assembly stress and prolong the service life of the boiler.
- ● Steel tube cutting, thread tube pressing and convection tube processing all adopt advanced CNC technology.
- ● Arched tube sheets and threaded fire tube was first adopted in China to increase heat transfer and completely solve the problem of cracking of the back tube sheet.
- ● Chain grate plate and back smoke chamber plate is cut by CNC plasma cutting machine, which looks neat and beautiful.
Advanced welding process
- ● The vertical and circumferential seam welding of the boiler adopts advanced automatic submerged arc welding technology to ensure the welding quality. All vertical and circumferential welds will go through 100% ray detection.
- ● The welding of smoke tube and the tube plate adopts pre-expansion to eliminate the gap between the tube and tube plate, then be welded by automatic argon arc welding, which effectively eliminate stress and prolong boiler life.
- ● The flange of the socket is welded by robots.
- ● The chain grate is manufactured by our factory, and it is tested for 72 hours before leaving the factory to ensure that the tightness is moderate and won’t deviate.
Precision parts processing
- ● Advanced manufacturing technology, using assembly line automatic spinning manufacturing.
- ● Enhance heat transfer and raise boiler thermal efficiency.
- ● Threaded smoke tubes are highly efficient heat transfer elements which is from many years research of our company. After continuous optimization, the heat transfer coefficient is 1.8 times higher than normal smoke tubes.
Unique structural design
- ● Disturbed flue gas to ensure complete combustion of volatile matters.
- ● The air volume takes about 30% of the total amount, and the wind speed is 50m³.
- ● The independent secondary fan makes it easy to control and adjust the wind volume and pressure.
- ● The high-temperature smoke generated by the combustion first enters the horoscope flue on both sides of the body from the tail (in this case, the boiler is water tube type), and the flue gas flows outside the tube.