SZL-type steam boiler pipe assembly, is a double drum longitudinal chain grate boilers. Boiler from the vertical position, the lower drum and convection bundle components. Left and right side of the combustion chamber is equipped with a light tube water wall tubes. Built with the drum separator unit and surface sewage plant, pot cylinder with regular sewage system. Arranged in the rear of the boiler economizer. Light chain grate combustion part is to achieve mechanical stokers, with blower, Fan mechanical ventilation, and air-screw machine automatic slag slag. Fuel from coal bucket fell on the grate into the combustion chamber, the flame is refracted through the arch upward through the body burning ember room off to the convection bank, after entering the economizer exit through smoke, dust, and then by the induced draft fan evacuating through the flue to the chimney into the atmosphere. Features: 1. The boiler division, under the two pieces of the factory, including boilers bulky upper body, upper steel wall oven set lower bulky including coal bucket, chain grate, steel base, the lower part of the furnace wall, in addition to masonry wall in the middle of the field remaining components are assembled outside the factory. Rear of the boiler economizer cast iron stove and air duct with supporting factory. 2. The use of light chain grate combustion section, bilateral air intake. Under the grate has six independent air chambers in the side room with adjustable air wind mechanism, by bubbling air from the blower at the lower side of the base into the second duct by tiaofeng institutions to enter the independent air chambers. 3. The upper part of the furnace wall assembly factory by factory, around the lower part of the furnace wall and arch made of refractory clay and silica fiber insulation materials. Since fuel stoker coal hopper through the gates into the furnace burning, burning ember cinder running under the grate slag bucket from falling into the spiral of slag discharged. The boiler has electronic control console, the console has a boiler thermal parameters display instrument, drums, Fan opening of the indicator, remote control button electric actuators. Boiler feed water supply system and features automatic over-temperature alarm device. 5. Suitable low calorific value coal combustion ≥17750J / Kg, volatile matter> 38.5%, ash content ≤32.4% of bituminous coal II. Boiler evaporation model (t / h) Rated pressure (MPa) steam temperature water temperature (℃) heating area (m2) thermal efficiency (%) combustion equipment SZL (H) 2-1.25-WIII 2 1.25 20 56 ≥77 chain saturated and moving grate SZL (H) 4-1.25-WIII 4 1.25 20 112 ≥77 chain and moving grate SZL (H) 4-1.25-WIII 4 2.5 20 113 ≥77 chain and moving grate SZL6-1.25-WIII 6 1.25 105 133 ≥77 chain and moving grate SZL6-1.6-WIII 6 1.6 105 150 ≥76 chain SZL8-1.25-WIII 8 1.25 30 173 ≥78 chain SZL10-1.25-WIII 10 1.25 105 286 ≥78 chain SZL15-1.25- WIII 15 1.25 105 310 ≥78 chain SZL20-1.5-WIII 20 1.6 105 431 ≥78 chain