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Horizontal Water Fire Tube Chain Grate Coal Fired Steam Boiler For Central Heating, Residential Heating
1.Model:DZL Chain Grate Stoker Type Boiler
2.Capacity:1-20ton/h
3.Pressure:0.7Mpa(7bar),1.0Mpa(10bar),1.25Mpa(13bar),1.6Mpa(16bar),2.5Mpa(25bar)
4.Steam temperature:174 °c,184 °c,194°c, 204°c,225°c
5.Fuel:coal,biomass
6.Structure:horizontal water-fire tube, single drum
7.Type:we have two types.
DZL :Chain grate stoker automatic feeding fuel and removing dregs . DZH :Manual operate moving grate, needs labour to feed fuel and remove the dregs.
8.Application:industrial production and processing
Sush as:Medicine, chemical, light industry, textile, building material, cultivation, food and beverage, plastic foam, printing, dyeing and washing, rubber processing, paper products,wood processing, hotel, clothing and leather manufacturer etc.
DZL type horizontal chain coal- fired steam boiler is a horizontal three - trip water - fire tube boiler.Two fire tubes are arranged in the pot barrel, and both sides of the furnace chamber are equipped with light tubes and water wall tubes.The combustion equipment adopts light chain grate to realize mechanical coal feeding, and is equipped with drum and induced draft fan to realize mechanical ventilation.The fuel falls on the grate from the coal sill, burns along with the grate, and the flue gas passes through the upper combustion chamber of the rear arch, enters the first bundle through the smoke chamber of the rear shed pipe to the front smoke box, folds into the second bundle from the front smoke box to the back smoke box, is introduced into the flue, dust collector and chimney through the induced draft fan, and finally exhausts to the atmosphere.The boiler automation level is high, the boiler feed water automatic regulation, high and low water level alarm, low water level interlock protection, lead, fan interlock protection.Boiler coal, slag and other operation mechanization, reduce the labor intensity of workers, complete supporting auxiliary machines.
Technical Parameters
| Model Item | DZL1-0.7-T DZL1-1.0-T DZL1-1.25-T | DZL2-0.7-T DZL2-1.0-T DZL2-1.25-T | DZL4-1.25-T DZL4-1.6-T | DZL6-1.25-T DZL6-1.6-T | DZL8-1.25-T DZL8-1.6-T | DZL10-1.25 DZL10-1.6 |
| Rated evaporation capacity (t/h) | 1 | 2 | 4 | 6 | 8 | 10 |
| Working pressure(Mpa) | 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 temperature(℃) | 170/184/194 | 170/184/194 | 194/204 | 194/204 | 194/204 | 194/204 |
| Feed water temperature(℃) | 20 | 20 | 20 | 20 | 20 | 20 |
| Effective area of grate(m2) | 2.22 | 4.1 | 5.85 | 7.95 | 9.75 | 10.77 |
| Fuel consumption (Kg/h) | 200 | 400 | 800 | 1200 | 1600 | 2010 |
| Exhaust flue gas temperature(C) | 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 8.6x 3.0x 2.6 |
| Weight (t) | 17 | 23 | 25 | 35 | 45 | 33 28 |
Performance Advantages
1. Excellent chain grate
1) The small scale chain grate boiler could resist the temperature as high as 1200℃, long working life.
2) The chain grate has a low coal leakage because of the small gap.
3) High automatic degree, decrease labor cost.
4) Convenient for maintenance, it could be done without boiler shut down.
5) Based on customers’ requirement and fuel characteristics, the grate could be designed as small scale grate, chain belt grate, bar grate, etc.
2. High thermal efficiency
1)The spirally corrugated tube strengthen the heat transfer, improve thermal efficiency. The flue gas has the foundation of disturbance, avoid ash depositing in tube.
2)The furnace wall was poured entirely by the heat-resistance concrete and high-temperature-resistance refractory brick, and the boiler shell use aluminium silicate board for heat preservation, low heat loss.
3) Equipped with economizer, make full use of the heat of flue gas, decrease the exhaust smoke temperature, increase thermal efficiency.
3. Avoid bulging
The riser tube bundle under the drum, remove the dead water region at the bottom of drum, sludge is not easy for depositing, the high temperature area of drum has better cooling, prevent bulging.
4. Avoid tube plate cracking
1) The steam boiler adopts arched tube plate and spirally corrugated tube, change the quasi-steel body into quasi-elastic body structure, reduce stress, solves the problems of tube plate cracking.
2) Arrange two sides gas duct in drum, the smoke gas could enter into the front smoke chamber smoothly, the temperature of tube plate is lower than 600℃, avoid cracking leaded by high temperature.
5. Sufficient output
Adopts horizontal type three pass structure and large furnace, to ensure the sufficient combustion, and the boiler could absorb the thermal expansion effectively. The large diameter boiler drum increases the radiant heating surface, to ensure the sufficient output.
6. Environmental protection
1) The splayed wall and smoke outlet have the function of dust removal, decrease the concentration of smoke emission.
2) The moving grate boiler adopts several environmental protect measures (bag dust collector, double towers desulfurization, etc.) to meet the national emission requirement.
Boilers Application
Medicine, chemical, light industry, textile, building material, cultivation, food and beverage, plastic foam, printing, dyeing and washing, rubber processing, paper products,wood processing, hotel, clothing and leather manufacturer 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.