Specifications
The drum consists of arched tube sheet and spirally corrugated tube, so as to prevent the tube sheet from cracking. 
The ascending calandria are arranged under the drum. With this arrangement, the dead water zone at the bottom of drum is eliminated, and the sludge is difficult to subside on it. As a result, the high-temperature region of drum obtains better cooling, and the bulge phenomenon at the bottom of boiler is eliminated effectively.
The optimal design of the spirally corrugated tube strengthens the heat transfer, speeds up temperature rapidly and enhances the boiler steam rate. 
It is the rational design of arch inside the furnace that improves combustion condition, enhances the dust failing function in it and reduces the pollutant emission of the boiler.
With good sealing, the wind box is easily to operate and can provide rational wind. Consequently, it reduces the air excess coefficient and increases the boiler thermal efficiency.
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Technical parameter
Boiler Model
DZL1-0.7-AII
DZL2-1.0-AII
DZL4-1.25
-AII
DZL6-1.25
-AII
DZL10-1.25
-AII
DZL15-1.25
-AII
DZL20-1.25
-AII
Capacity (t / h)
1
2
4
6
10
15
20
Rated Pressure (MPa)
0.7
1.0
1.25
1.25
1.25
1.25
1.25
Rated Steam Temperature (℃)
170
183
194
194
194
194
194
Heating Area (㎡)
30.5
64.2
128
190.4
364.6
594.9
712.1
Effective Area of Grate (㎡)
2
3.6
5.29
7.37
12.67
16.11
22.3
Coal Consumption (kg/h)
191.5
388
780
1155
1890
2250
2980
Smoke Emission Temperature (℃)
158
167.5
165.5
166
156.7
153.5
161.9
Design Efficiency (%)
78.9
78.1
78
79
79.8
80.4
80.1
Weight (t)
15
19.5
25.8
30(TOP)
7.5(BOTTOM)
40(TOP)
32(BOTTOM)
32(TOP)
29(BOTTOM)
32(TOP)
37(BOTTOM)
Dimensions
L × W × H (m)4.6×2.2×2.9
5.3×2.6×3.1
6.5×2.6×3.5
6.3×3.0×3.55
6.6×2.53×1.72
6.5×3.67×3.54
8.2×3.25×2.15
8.4×3.55×3.54
Unpackaged parts
8.6×3.65×3.54
Unpackaged parts
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DZL PRODUCTION PROCESS
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