SZL Series Coal Fired Hot Water Boiler

SZL series coal-fired hot water boiler

Product Thermal Capacity: 4.2-17.5 MW

Working Pressure:1.0-1.25 MPA

Available Fuel: Bituminous Coal,Lean Coal,Anthracite

Available Industries: Heating, hotels, schools, hospitals

SZL Series Hot Water Boiler Introduction

SZL series coal fired boiler, adopts quick fitting and assembly structure. The 4-6t/h boiler is of quick fitting tube structure, exit shop after completely assembled, the boiler of 6-35t/h is composed of 2 main components. The upper assembled component is the boiler proper heat absorbing part, and the lower assembled component is of combustion equipment. The SZL series hot water boiler former part of the boiler proper is arranged a membrane wall. The upper part of it is connected to boiler cylinder. And its lower part is connected to collective chest, so as to form a combustion room and absorb the radiated heat from the furnace. Its rear part is arranged with dense convection tubes between upper and lower boiler cylinders. The high temperature smog after combustion shall stand for twice returning flushing transversely to the heat accepting surfaces, and shall be introduced to coal saver singly arranged, and flow into duster and exhausted from chimney in the end.

SZL Series Hot Water Boiler Advantages

CNC manufacturing technology

SZL series double-drum longitudinal-type chain furnace drain hot water boiler adopts quick assembly or assembly structure. 2.8~4.2MW is the structure of quick-loading water pipe, which is factory-installed after being completely assembled in the factory; 4.2~29MW is composed of two upper and lower parts, the upper part is the body heating surface, and the lower part is the combustion equipment. The front end of the boiler body is surrounded by the upper part of the water-cooled wall and the lower part of the drum is connected with the header to form a combustion chamber to absorb the radiant heat of the furnace. And the rear end of the boiler is arranged with a dense convection tube bundle between the upper and lower drums, and the high-temperature smoke after combustion after passing through the second return stroke, the gas is flushed to the convective heating surface and then led to the separately arranged economizer, and finally enters the dust collector and is discharged through the chimney.


Advanced welding process

  1. The welding of important parts like the vertical and circular seams of the boiler, the tubes, the inside of boiler and the flange are all adopted automated welding processes such as submerged arc welding or gas shielded welding to ensure the welding quality.
  2. All the vertical and circular seams will be done 100% radiographic inspection.
  3. This series of industry boilers adopt tube flange weld adopts robot welding.
  4. The chain grate panel, front and rear smoke chamber panel adopts CNC plasma cutting machine to cut orderly and beautifully.


Precise parts processing

  1. Advanced manufacturing technology, using assembly line automatic spinning manufacturing.
  2. Enhance heat transfer and raise boiler thermal efficiency.
  3. Threaded smoke tubes are highly efficient heat transfer elements which is from many years research of our company.
  4. After continuous optimization, the heat transfer coefficient is 1.8 times higher than normal smoke tubes.


Unique structural design

  1. According to different capacity, different numbers of independent air bins are arranged from front to back of the grate.
  2. The user can reasonably adjust the air distribution according to different combustion conditions to ensure that the fuel is fully burnt.
  3. Secondary air is input to disturb fuel gas in the furnace, to ensure the fuel is burnt totally.
  4. The independent secondary fan makes it easy to control and adjust the air volume and air pressure.
  5. Feeds evenly feeding and avoid flashback.


SZL Series Coal Fired Boiler Specification

Model Rated thermal power (MW) Rated working pressure (MPa) Rated output water temperature (℃) Thermal efficiency (%) Maximum transport dimension (m)
SZL4.2-1.0/95/70-AⅡ 4.2 1.0 95 >80 6.20×2.80×3.65
SZL5.6-1.0/95/70-AⅡ 5.6 1.0 95 >80 7.80×3.25×3.61
SZL7-1.0/95/70-AⅡ 7.0 1.0 95 >80 7.80×3.25×3.61
SZL7-1.0/115/70-AⅡ 7.0 1.0 115 >80 7.80×3.25×3.61
SZL7-1.25/115/70-AⅡ 7.0 1.25 115 >80 7.80×3.25×3.61
SZL8.4-1.0/95/70-AⅡ 8.4 1.0 95 >80 8.80×3.52×3.65
SZL8.4-1.0/115/70-AⅡ 8.4 1.0 115 >80 8.80×3.52×3.65
SZL8.4-1.25/115/70-AⅡ 8.4 1.25 115 >80 8.80×3.52×3.65
SZL10.5-1.0/95/70-AⅡ 10.5 1.0 95 >80 9.65×3.28×3.60
SZL10.5-1.0/115/70-AⅡ 10.5 1.0 115 >80 9.65×3.28×3.60
SZL10.5-1.25/115/70-AⅡ 10.5 1.25 115 >80 9.65×3.28×3.60
SZL14-1.0/95/70-AⅡ 14 1.0 95 >80 10.65×3.28×3.60
SZL14-1.0/115/70-AⅡ 14 1.0 115 >80 10.65×3.28×3.60
SZL14-1.25/130/70-AⅡ 14 1.25 130 >80 10.65×3.28×3.60
SZL17.5-1.0/95/70-AⅡ 17.5 1.0 95 >81 11.65×3.80×3.60
SZL17.5-1.0/115/70-AⅡ 17.5 1.0 115 >81 11.65×3.80×3.60
SZL17.5-1.25/130/70-AⅡ 17.5 1.25 130 >81 11.65×3.80×3.60

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