1、 Structure Introduction
The new DZH series hot water boiler is a single drum vertical water fire tube shell boiler, and the combustion equipment is a movable grate. The water-cooled walls on both sides of the furnace are radiation heating surfaces, and the two wings of the furnace are convection heating surfaces. Threaded smoke pipes are arranged inside the boiler drum for convection heating surfaces. The furnace wall is made of heat-resistant concrete and is poured and compacted into a new process. The outer side of the boiler main engine is a three-dimensional protective plate shell. The boiler body adopts a symmetrical arrangement of upper drum, water-cooled wall tubes, and headers in the overall structure. The drum is composed of a cylinder body and front and rear tube plates welded together. The boiler furnace is equipped with spark walls, which have high combustion efficiency. This series of boilers adopts new scientific research achievements, such as header return water injection, arch tube plate, threaded smoke tube, etc., to solve the problems of tube plate cracks, water-cooled wall tube bursting, low thermal efficiency, insufficient output, and poor coal quality adaptability in shell boilers.
2、 Combustion process
The fuel enters the furnace through the active grate for combustion, and the generated flue gas enters the two wing convection tube bundle through the outlet smoke window on the eight shaped wall at the bottom of the drum. It enters the threaded smoke pipe through the front smoke box, passes through the economizer and dust collector, and is drawn by the induced draft fan and discharged into the atmosphere through the chimney.
