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ECCJ / TextReport Vietnam

Guideline Items
Items of Guideline
  1. Rationalization of combustion of fuels
  2. Rationalization of heating, cooling, heat transfer
  3. Waste heat recovery
  4. Rationalization of heat-to-power conversion
  5. Elimination of heat loss by emission, conduction, electric resistance
  6. Rationalization of electricity-to-power/heat conversion
Numerically Expressed Items among Guideline
  1. Air ratio of boilers
  2. Air ratio of furnaces
  3. Exhaust gas temperature of boilers
  4. Waste heat recovery ratio of furnaces
  5. Surface temperature of furnaces
  6. Facilities of which power factor should be increased
Guideline --- Combustion / Boiler
Air Ratio Standard for Boilers by the Law
Purpose of use Load ratio % Solid fuel Liquid fuel Gas fuel Blast furnace gas & others
Fixed bed Fluid'd bed
Power utl'y 75 - 100  -   -  1.05 - 1.2 1.05 - 1.1 1.2
Others
(Capacity t/h)		   　 　 　 　 　
30 -  50 - 100 1.3 - 1.45 1.2 - 1.45 1.1 - 1.25 1.1 - 1.2 1.2 - 1.3
10 - 30 50 - 100 1.3 - 1.45 1.2 - 1.45 1.15 - 1.3 1.15 - 1.3  - 
5 - 10 50 - 100  -   -  1.2 - 1.3 1.2 - 1.3  - 
- 5 50 - 100  -   -  1.2 - 1.3 1.2 - 1.3  - 
Air Ratio Target for Boilers
Purpose of use Load ratio % Solid fuel Liquid fuel Gas fuel Blast furnace gas & others
Fixed bed Fluid'd bed
Power utl'y 75 - 100  -   -  1.05 - 1.1 1.05 - 1.1 1.15 - 1.2
Others
(Capacity t/h)		   　 　 　 　 　
30 -  50 - 100 1.2 - 1.3 1.2 - 1.25 1.05 - 1.15 1.05 - 1.15 1.2 - 1.3
10 - 30 50 - 100 1.2 - 1.3 1.2 - 1.25 1.15 - 1.25 1.15 - 1.25  - 
5 - 10 50 - 100  -   -  1.15 - 1.3 1.15 - 1.25  - 
- 5 50 - 100  -   -  1.15 - 1.3 1.15 - 1.25  - 
Guideline --- Combustion / Furnace
Air Ratio for Furnaces by the Law (Standard / Target)
Categories Type of fuel & operation Remarks
Gaseous fuel firing Liquid fuel firing
Continuous Batch Continuous Batch
Melting furnace for metal casting 1.25 / 1.05-1.20 1.35 / 1.05-1.25 1.30 / 1.05-1.25 1.40 / 1.05-1.30  
Continuous reheating furnace for steel 1.20 / 1.05-1.15   1.25 / 1.05-1.20    
Metal heating furnace except continuous steel reheating 1.25 / 1.05-1.20 1.35 / 1.05-1.30 1.25 / 1.05-1.20 1.35 / 1.05-1.30  
Metal heat treatment furnace 1.20 / 1.05-1.15 1.25 / 1.05-1.25 1.25 / 1.05-1.20 1.30 / 1.05-1.30  
Petroleum heating furnace 1.20 / 1.05-1.20   1.25 / 1.05-1.25    
Heat cracker, reformer 1.20 / 1.05-1.20   1.25 / 1.05-1.25    
Cement kiln 1.30 / 1.05-1.25   1.30 / 1.05-1.25   Liquid value be applied for pulvirized coal firing
Lime kiln 1.30 / 1.05-1.25 1.35 / 1.05-1.35 1.30 / 1.05-1.25 1.35 / 1.05-1.35 Liquid value be applied for pulvirized coal firing
Dryer 1.25 / 1.05-1.25 1.45 / 1.05-1.45 1.30 / 1.05-1.30 1.50 / 1.05-1.50 Only for burner
Guideline --- Heat Recovery
Waste Heat Recovery Ratio Standard & Target for Furnaces
Exhaust gas tempereture (deg.C)
Capacity class
Exhaust heat Standard
(%)
recovery ratio Target
(%)
(Reference for target)
Waste gas
temperature(°C)		 Preheat air
temperature(°C)
500 & under
A & B
25
35
275
190
500 & under,over 600
A & B
25
35
235
230
600 & under,over 700
A
B
C
35
30
25
40
35
30
365
400
435
305
270
230
700 & under,over 800
A
B
C
35
30
25
40
35
30

420
460
505
350
310
265
800 & under,over 900
A
B
C
40
30
25
45
40
35
435
480
525
440
395
345
900 & under,over 1000
A
B
C
45
30
25
55
45
40
385
485
535
595
495
440
1,000 & over
A
B
C
45
30
25
55
45
40
 
 

Notes:
A:Rating capacity of over 20 Gcal/h(84 GJ/h)
B:Rating capacity of 5 to20 Gcal/h(21 to 84 GJ/h)
C:Rating capacity of 1 to 5 Gcal/h(4 to 21 GJ/h)
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