DZL series coal-fired hot water boiler

DZL series coal-fired hot water boiler


Boiler manufacturing process:

The key machining processes such as steel plate blanking, circle circle and tube plate drilling all adopt advanced CNC machining technology to reduce assembly stress, extend boiler service life and reduce cost;

Steel pipe cutting, threaded pipe pressing, and convection pipe processing are all advanced CNC machining processes;

In the country, the first use of arched tube plate and threaded pipe structure to increase heat transfer, completely solve the problem of tube plate cracking;

Chain grate panel, front and rear smoke box panels are cut by CNC plasma cutting machine, neat and beautiful;

Boiler welding process:

The vertical and circumferential seam welding of the boiler adopts advanced submerged arc automatic welding technology to ensure the welding quality. 100% radiographic inspection of all longitudinal and circumferential seams;

The welding of the pipe and the tube sheet is firstly pre-expanded to eliminate the gap between the tube and the tube sheet, and then the welding process of automatic welding by argon arc is adopted to effectively eliminate the stress and prolong the service life of the boiler;

Pipe flange welding, using robot welding;


DZL series coal-fired hot water boiler is a horizontal three-return water-fire pipe chain grate boiler, burning medium-sized bituminous coal and anthracite. The boiler body is arranged in a longitudinal direction of a single drum, and a threaded tobacco pipe is arranged in the drum to form a convection heating surface, and the drum and the water-cooling walls on both sides constitute a furnace heating surface. The combustion equipment uses a light chain grate. The overall quick release form is shipped. Electrical control realizes stepless speed regulation of the grate, limit parameter alarm and interlock protection.

The characteristics of this type of boiler: compact structure, simple size, capital investment investment; mechanical addition of coal and slag; boiler output and high efficiency. DZL series coal-fired hot water boiler is a popular heating equipment for the production of gas for the majority of small and medium-sized industrial and mining enterprises and the heating of the people.

Technical data

Model Rated thermal power(t/h/MW) Working pressure(MPa) Rated output water temperature(℃) Return water temperature(℃)
DZL0.7-0.7/95/70-M 0.7 0.7 95 70
DZL1.4-0.7/95-70-M 1.4 0.7 95 70
DZL2.8-0.7/95/70-M 2.8 0.7 95 70
DZL4.2-1.0/115/70-M 4.2 1 115 70

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