SZS series gas-fired(oil-fired) steam boiler introduction

SZS series boiler body is longitudinal 2-drum, D-type chamber combustion structure. The furnace is on right side and the convec-tion bank tube is on left side. The body is fixed on the body chassis by flexible supports in the middle and two ends of the lower drum, and it can secure to let the whole boiler body to expand sideways. Surround furnace there are narrow space membrane cooling tube wall. It is totally sealed and separated between the membrane wall on furnace left side and the convection bank tube. The rear part of convection tube bank is a tube-reducing staggered structure, and the front part is aligned structure. The flue gas generated from fur-nace combustion flows from furnace rear outlet to the end of combu-stion chamber, convection tube bank area, and then turns from the front- left of furnace to the spiral finned tube energy saver, and finally flows into ducting and through chimney emits to atmosphere.

Manufacturing Process Features

Boiler manufacturing process

The key processing technology like material preparation of steel tubes, circling, drilling of tube plate, etc are all adpot advanced CNC machining process to decrease the assemble stress and extend the boiler working life.

Interior thermal insulation is adopted to flue gas duct and flue gas port to reduce the noise during the boiler operation.

Allconvectiontubesofhightemperatureareausevibrating- proof fastener to provent the pipe orifice of convection tubes from fracturing.

The inside of observation hole uses moulding high-alumina refractory and manhole cover sealing device to solve the problem of overheating of this part by constructed with refr¬actory bricks.

Every piece of membrane wall between furnace and con¬vection tubes use high temperature resistance stainless steel Cr25Ni20. This avoid the breakdown of high temperature flue gas short circuit caused by using refractory material.

Impeller blasting and stoving varnish are done to boiler to make sure the boiler has good-looing appearance and anti¬septic property.

Boiler welding process

The boiler vertical and circular seam adopts advanced unionmelt welding process to ensure the welding quality. All the vertical and circular seams will be done 100% radiographic inspection.

Water circulation

The boiler water circulation adopts enforced circulation to secure each heat absorbing part can» get efficient cooling and prevent vaporization;

Membrane type structure

Whole membrane wall structure D-type arrangement

Convection tubes of upper and lower drum form the convection heating surface and ensure the whole boiler expand towards the two ends.

The combustion chamber adopts narrow pitch membrane wall which has good gas tightness and reduce heat loss and improve boiler heat efficiency.

The rear part of convection tubes is rare shifted structure while the front part is sequnce structure.

The front and rear walls of boiler body adopt membrane type structure which highly improve the working life of front and rear wall up to more than 20 years.

The sealing of both sides of membrane wall and drums adopt comb plate to avoid the reveal of condensate water and fuel gas caused by sealing with refractory concrete.

Furnace insulation

Adopt high-class aluminium silicate fibre. Use refractory mortar to keep the furnace temperature under 45° and co¬ntrol heat loss effeciently.

Combustion chamber

Due to combustion chamber applying whole membrane water cooling structure and adopted micro-positive pressure combustion, there is no smoke leakage, and there is no pollution in operation environment;

Manholes&Check door

The manholes are arranged at the two ends of upper and lower drums, and check door is set a rear part of boiler. These openings make users easy for entering inside doing maintenance and cleaning work; prevent vaporization;

Technical data