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4T/H Industrial Biomass Pellet Fired Chain Grate Packaged Steam Boiler In Myanmar
The new DZL series coal fired boiler is a single-drum vertical water-fire tube shell boiler, and the combustion equipment is a chain grate. The water walls on the left and right sides of the furnace are radiant heating surfaces, the two wings of the furnace are convective heating surfaces, and the convection heating surfaces of threaded smoke pipes are arranged in the drum. Shield shell.
This series of coal fired steam boilers use the latest scientific research results, such as: arched tube sheet, threaded smoke tube, etc., to solve the problems of shell-type boiler tube sheet cracks, bulging at the bottom of the drum, tube bursts on the water wall, low thermal efficiency, and insufficient output.
Model: DZL Series Chain Grate Boiler
Structure: Three Pass Water and Fire Tube
Capacity: 1-10 ton/h
Pressure:0.7/1.0/1.25/1.6/2.5Mpa
Temperature:170/184/194/204/225C
Application:Rice mill,sugar mill, wood processing, textile mill, food industry, chemical plant etc
DZL series coal biomass fired boiler is single drum water tube and fire tube boiler, combustion equipment is chain grate. Water wall tubes at left and right sides of furnace are the radiated heating area. the two wings at furnace and screw fire tube in the drum are convection heating area. This boiler uses the upper drum, water wall tube and head are in symmetrical arrangement mode. This furnace structure in reasonable arrangement and high efficiency. This series boiler adopts several environmental protect measures (bag dust collector, double towers desulfurization, etc.) to meet the national emission requirement.
Coal Fired Boiler Burning process
The fuel falls from the coal hopper to the front of the grate. With the operation of the grate, the coal undergoes preheating, dry distillation, ignition, and embers. The slag falls into the slag hopper and is discharged from the furnace at any time by the slag remover. The flue gas is in the front and back arches. The throat between the throat can form a vortex to fully mix with the air, heat the front arch, improve the fire conditions, enter the two-wing convection tube bundle through the exit smoke window on the upper part of the arch, enter the threaded smoke pipe through the front smoke box, and pass through the economizer and dust collector. The induced draft fan is led to the chimney and discharged.
Technical Parameters
| Model | DZL1-0.7-T | DZL2-0.7-T | DZL4-1.25-T | DZL6-1.25-T | DZL8-1.25-T | DZL10-1.25 |
| Rated evaporation | 1 | 2 | 4 | 6 | 8 | 10 |
| Working | 0.7/1.0/1.25 | 0.7/1.0/1.25 | 1.25/1.6 | 1.25/1.6 | 1.25/1.6 | 1.25/1.6 |
| Rated steam | 170/184/194 | 170/184/194 | 194/204 | 194/204 | 194/204 | 194/204 |
| Feed water | 20 | 20 | 20 | 20 | 20 | 20 |
| Effective area of | 2.22 | 4.1 | 5.85 | 7.95 | 9.75 | 10.77 |
| Fuel consumption | 200 | 400 | 800 | 1200 | 1600 | 2010 |
| Exhaust flue gas | 150 | 150 | 150 | 150 | 150 | 150 |
| Thermal Efficiency | 82 | 82 | 82 | 82 | 82 | 82 |
| Size(m) | 5.1x 2.2x 3.0 | 5.5x 2.3x 3.3 | 6.6x 2.6x 3.6 | 8.2x 2.9x 3.8 | 8.1x 3.1x 3.8 | 7.7x 3.2x 3.6 |
| Weight (t) | 17 | 23 | 25 | 35 | 45 | 33 |
Technical characteristics
(1) The arched tube sheet and the threaded smoke tube are used to form the drum, so that the drum is changed from a quasi-steel body to a quasi-elastomeric structure, and the bracing parts in the tube plate area are eliminated, and the stress is reduced. The smoke pipe is changed from two-pass to single-pass, which solves the problem of tube sheet cracks.
(2) Due to the arrangement of the rising pipe row at the bottom of the drum, the dead water area at the bottom of the drum is eliminated, so that the sludge is not easy to deposit, and the high temperature area of the drum can be well cooled, preventing the bulge in the lower part of the boiler shell.
(3) The use of high-efficiency heat transfer threaded smoke pipes achieves enhanced heat transfer effects, achieves the characteristics of rapid boiler heating and pressure rise, and improves the thermal efficiency of the boiler.
(4) The structure is compact, and compared with the same type of boiler, the overall size is small, which saves the investment in the infrastructure of the boiler house.
(5) Stable operation, convenient adjustment and sufficient output. Has a certain overload capacity.
(6) Threaded smoke tube is used to enhance heat transfer, which improves the heat transfer coefficient and thermal efficiency. Because the flue gas has a disturbing effect in the tube, it is not easy to accumulate dust in the smoke tube, which plays a role of self-cleaning.
Quality Inspection
Strength calculation report with applied materials information;
100% NDT(non-destructive inspection) report of steel plate, tube and welding rod;
100% X-ray inspection report (welding seam): to ensure the quality of the entire boiler;
Hydraulic test report: ensure the standard working pressure and safety;
Third-party inspection report: by Zhoukou Institute of Special Equipment Inspection & Technical Research (China official).
Application scope:
This steam boiler is used for producing desired steam for manufacturing process in the weave factory, printing and dyeing, papermaking and other industry like: food, rubber, plastic, chemical, pharmaceutical, etc, and for heating room and bath in factories, departments, hotels, schools, restaurants, services industries etc.
FAQ of coal fired boiler
1.What is the size of furnace door and blower hopper?
Size of furnace door:
Standard elliptical furnace door:300*800*1500
Blower hopper size:
2 tons conical hopper: 1400*800*1500
4 tons conical hopper: 2200*1400*1500
2.What is the combustion mode of coal/biomass fired boiler?
The combustion mode of coal/biomass fired boiler is layer combustion. Place the flue on the fixed or moved grate, to form an evenly fuel bed with a certain thickness, air comes from the bottom of grate, and combustion occurred on the fuel bed.
3.Material of boiler drum / steel plate / tube.
Boiler drum material: Q245R,carbon steel, executive standard: GB713-2008
Tube material: 20# seamless steel pipe, carbon steel, executive standard: GB3087-2008
Still kettle material: Q345R, alloy steel, executive standard: GB713-2008
4.What is the height of chimney?
The chimney is usually 30m, irrespective of the special circumstances.
5.What are the heat-resistance temperature of grate and furnace?
The heat resistance temperature of grate is related to the grate material, the highest temperature could be as high as 1100℃, and the lower temperature could be 700℃.
6.What is the temperature of smoke gas?
The highest temperature of smoke gas is 165℃.
7.How long can the coal/biomass fired boiler works?
Coal/biomass boilers could work for 10~15 years, under correct operation, high water and coal quality, etc.
8.How to avoid collapse of bricks, and what should be done if it happened?
When boiler installation finished, drying the boiler according to the manual, it’s very important to avoid collapse of bricks.
9.How many stokers do I need for one boiler?
Usually 3 person, every 8 hours a shift.