Introduction of SZL series double drum coal fired steam boilerSZL series coal/biomass chain grate boilers with high efficiency, strong overload capacity and various fuel adaptability (biomass pellets or coal), are well known as the best design among contemporary domestic similar products and have reached the world's advanced level. The boiler is mainly composed of upper and lower drums, convection tubes, water-cooling wall tubes, down pipes and headers. The upper and lower drums are arranged longitudinally and with belt type chain grate as its combustion equipment and non-polar speed-changing device drivers. The boiler proper is composed of upper and lower longitudinal drums and convection tubes. With the arrangement of the Φ51*3 pipes in the combustion chamber as the water-cooling wall, water-steam separation device and continuous sewage device in the upper drum and periodical sewage device in the lower drum for assure steam quality. Equipped continuous automatic feeding water device for making sure that the boiler can be safely operated. The economizer is laid at the end of the boiler. Main Features of szl series double drum coal fired steam boiler1. By adopting the water-cooling system in packaged boilers which is usually used in power plant boilers, the boiler can achieve large heat transfer area, high heat transfer efficiency, low heat loss, good air tightness, and no distortion or dust leakage of the brickwork.2. The front and back water-cooling wall tubes stretch themselves to the upper side of the chain grate, which increases the heating surface and overload capacity. The frames of the front and the rear arch are made of water-cooling tube wall, together with high-alumina cement, which can avoid the defects of the cracking and collapsing of the arch and extend its lifespan.3. The distance between the front shaft and the rear shaft of the grate stoker is longer than other similar type domestic products. In this way, the combustion time of the fuel in the furnace is extended and the fuel combustion is more sufficient and the carbon content in the slag is decreased. Meanwhile, the actual heating surface of the grate is increased and the overload capacity is remarkably enhanced.4. There are six independent wind chambers arranged lengthways and each chamber has an independent air adjuster, which can respectively adjust the air volume in each chamber so as to achieve the best combustion effect.

WNS series gas/oil fired steam boiler is horizontal three pass fire tube wet back full automatic steam boiler.  It normally suitable for 500kg to 20ton/h capacity, use all kinds of gas and oil fuels,such as natural gas, lpg,lng,cng,city gas,biogas, diesel oil,heavy oil.1.Model:WNS2.Capacity:500kg, 1 ton,1.5 ton,2 ton, 3 ton, 4 ton, 5 ton,6 ton, 8 ton,10 ton, 12 ton, 15 ton,20 ton3.Design pressure:1.0Mpa(10bar/10kg/145psi), 1.25Mpa(13bar/13kg/180psi), 1.6Mpa(16bar/16kg/232psi),2.5Mpa(25bar/25kg/362psi)4.Steam temperature:184℃,194℃,205℃,226℃5.Design fuel:natural gas, lpg,lng,cng,city gas,biogas, diesel oil,heavy oil6.Structure: three pass fire tube wet back  1.High Efficiency 1) Equipped with high quality and reliable burner, high combustion efficiency, low harmful gas emission and noiseless operation. 2) Adopts horizontal type three pass structure, absorbs the thermal expansion effectively. Uses large diameter corrugated furnace, large combustion space, high combustion efficiency. 3) The spirally corrugated tube strengthen the disturbance of flue gas, high heat transfer efficiency. 4) The boiler shell use aluminium silicate board for heat preservation, low heat loss. 5) Equipped with economizer, make full use of the heat of flue gas, decrease the exhaust smoke temperature, the thermal efficiency could be increased to as high as 97%. 2. High Safety Performance 1) Complete gas manifolds and protection system, including filter, pressure regulating valve, and solenoid valve, etc., to ensure the safety performance of fuel. 2) Reliable boiler auxiliaries and multiple safety protection devices, such as pressure controller, pressure transmitter, water level alarm, safety valve, etc. 3) Equipped with explosion proof equipment, discharge high energy when deflagration happened in furnace, to ensure the boiler operate safety and efficiently. 3. Full Automatic Control Adopts PLC full automatic intelligent control cabinet and interlock protection program, has the protection function of water shortage, over pressure, over temperature, gas leakage, flame out, electric leakage, and phrase-lacking or overloading of motor, etc. 4. Low Cost 1) Adopts proprietary technology of  Mer Boiler, the boiler is 100% butt welding, high quality, and long working life, low maintenance fee. 2) The boiler has high combustion efficiency，energy saving, and low cost on fuel.   5. Save Space Adopts fast assemble structure, compact structure, convenient for transportation, small occupation.   6. Convenient Maintenance 1) There are manhole, head hole, and special hand hole on the boiler. The front and back smoke chambers are equipped with movable doors, convenient for boiler internal installation, inspection and clean. 2) The explosion proof door has the fire sight glass and inspection gallery, convenient for furnace checking and maintaining. 

Product description I.General introduction 1.Model:DZL 2.Capacity:1-20ton/h 3.Pressure:1.0Mpa(10bar),1.25Mpa(13bar),1.6Mpa(16bar),2.5Mpa(25bar) 4.Steam temperature:184 °c,194°c, 204°c,225°c 5.Fuel:coal/biomass/rice husk 6.Structure:horizontal water-fire tube, single drum 7.Type:we have two types.One is DZL chain grate stoker automatic feeding fuel and removing dregs type. Another is DZH hand operate moving grate type which needs labour to feed fuel and remove the dregs. 8.Application:industrial production and processing.III.Technical datasheet Notice:1.For other capacity like 8 ton/h and 12ton/h, we can also provide.2.This table only shows pressure 1.0Mpa(10bar and 1.25Mpa(13bar), we also manufacture  boiler 1.6Mpa(16bar) and 2.5Mpa(25bar).3.The parameters are for reference, we have been improving our technology. If the technology is improved, please refer to the data showed on drawing.IV.Our boiler advantages 1.Three pass structure.Function: ectend the flow of smoke and enhance the heat transfer.  2. Water-fire tube type. Function:Fire tube:the flue goes through furnace, wing-shape flue and fire tubes to form three pass as said in the above.Water tube:  water in some tubes rises after heating and some declines, which forms  a natural circulation. 3.Spirally corrugated tube Function: heat transfer enhancement, reduce the spirally corrugated tube numbers, and improve the suppleness to avoid the tube plate cracking. 4.Arched tube plateFunction: reduce the thermal stress of weld and improve the tube plate suppleness,meantime, simplify the structure and save the boiler room space.5.Wing-shape flue. Function:reduce the smoke temperature of high temperature tube plate to slow down subcooled boiling. In this way, it can prevent tube plate cracking, reduce heat load of boiler bottom and prevent bulge.6.Simple circulation loop, large sized down pipe and bottom container. Function: Prevent tube explosion , increase the reliability of water circulation ,avoid deposition of debris and dirt,reduce fuel consumption and improving the operating time of boiler.7.New type arch made with refractory cement by overall pouring and big size furnace.  Function: Reduce fuel consumption and protect the environment. 8.Optimally designed water feeding apparatus and steam separation device.Function: The optimally designed water feeding apparatus reduces overhigh water level in shell high temperature zone due to overheat9.optimally designed steam separation device is good for  gravity separation, which makes the steam humidity lower than 1%, obviously lower than national standard of 4%;Small overall dimensions and low boiler room investment cost. Function: The main heating surface is installed in the shell, and a boiler with less capacity can cancel the rear heating surface. Its overall dimension is obviously lower than other furnaces. The boiler below 100 steam tons (70MW) can be arranged in single layer, making the investment of the boiler room save more than 50% than other furnaces;10.Complete protection deviceFunction: deal with the situation of overpressure,overtemperature,water shortage and flameout.

Power station boilers are our main products, often in conjunction with steam turbines, providing a whole solution to the power shortage of factories in Africa and South America. This boiler mainly work  with 10 ton/h, 20 ton/h, 30 ton/h, 35 ton/h, 45 ton/h  capacity . generally more than 25 bar pressure, after the power generation,the low temperature steam can also be used for production, is the factory use electricity, also is a kind of energy-saving solutions