D-type Water Tube Oil & Gas Fired Boiler

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D-type Water Tube Oil & Gas Fired Boiler

? Boiler parameter range:

SZS2~65t/h,SZS7~70MW?

? Technical characteristics:

This type of boiler is of double drum, vertical arrangement and “D” type furnace design with 1 or 2 burners located where the front wall stands. Inside it has an air-tight furnace structure with densely arranged tubes and air-proof casing. Outside it is covered with insulation materials and convex color plates. The flue gas takes a U turn. It goes into the 1st convection tube bank from the furnace, turns after passing the flue, and flows into the economizer with finned tubes when leaving the 2nd convection tube bank. The water which goes into the upper drum from the economizer is turned into steam by means of natural circulation after passing the convection tube bank and water cooled wall, and then supplied to the user via the main steam valve. Combustion at a slight positive pressure allows for a furnace volume heat release rate as large as nearly 40×103kcal.h/m3. Upper and lower drums and convection tube banks are assembled and subjected to a hydrostatic test prior to delivery. The steam boiler has a capacity of 2~75t/h and working pressure of 0.7~5.4Mpa, while the hot water boiler has a capacity of 0.7~21MW. The feedwater and return water temperatures are 95?/70? and 115?/70? respectively.

The boiler has the characteristics of small volume, compact structure, high combustion efficiency, convenient installation , high degree of automation, etc.

Adopting micro positive pressure combustion to improve the thermal efficiency and reduce the operation cost

Upper drum adopts F 1000 - F 1200 diameter to increase the separation height and guarantee the quality of steam

Boiler flue gas partition wall adopt seal membrance structure not only improve sealing and prevent short circuit  but also increase flue gas and improve the utilization ratio of steel and effectively reduce the size of our boiler.

holes are pre-opened on membrane wall baffles for timely inspection and repair. The inspection of convection tube banks is no longer a problem. 

Convection tube banks are assembled with special tooling/fixtures, and must pass a hydrostatic test prior to delivery. It not only reduces the installation workload, but also ensures the boiler quality.

The structure design of densely arranged tubes and membrane wall with finned tubes ensures that it would never go overheating outside the furnace tube wall, and the sealing would be maintained. The temperature of insulation and sealing steel plates would not go over 250?, which ensures the sealing steel plates’ ability of oxidation corrosion resistance.

The design of internal seal casing and external embossed casing not only ensures good sealing, but also gives the boiler a better appearance

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? Technical Specifications of SZS Series Oil/Gas-fired Steam Boiler:

Note: The data in the table are all for the boiler with mark ?.