ECCJ / Text / Thailand / Appendix 3-1 / Standards for Judgment by Enterprises for Streamlining of Energy Use at Plants and Implementation Businesses

ECCJ / Text

Thailand

Attachment Table 2 (B) Target waste gas temperature and target waste-heat recovery rate (II 1 (2) 20))

(2)Target waste-heat recovery rates for industrial furnaces (II 1 (2) 20))

Exhaust gas temperature means the temperature at the furnace outlet or recuperator inlet for exhaust gas emitted from the furnace chamber.
The capacity categories for industrial furnaces are as follows:
1. Furnaces with a rated capacity of from 84,000 MJ per hour.
2. Furnaces with a rated capacity of from 21,000 MJ to under 84,000 MJ per hour.
3. Furnaces with a rated capacity of from 840 MJ to under 21,000 MJ per hour.

Notes:
1. Values for target waste-heat recovery rate given in the table indicate the recovered heat value as a proportion of the sensible heat value of exhaust gas emitted from the furnace chamber at combustion at near rated load.
2. Values for target waste-heat recovery rate given in the table shall not apply to the waste-heat recovery rates of the following industrial furnaces; provided, however, that consideration shall be given to increasing the waste-heat recovery rate based on the table where possible.
  - (1) Furnaces with a rated capacity of under 840 MJ.
  - (2) Furnaces requiring a special atmosphere for oxidation or reduction.
  - (3) Furnaces combusting byproduct gas with a heat value of no more than 3,800 kJ per normal cubic meter.
  - (4) Boilers not in operation at regular inspection or otherwise not in regular operation, and boilers used for development, research or trial production.
3. Values for waste gas temperature and preheated air temperature given under the Additional information column in the table were determined by calculating the waste gas temperature for waste-heat recovery at the target waste-heat recovery rate and the preheated air temperature for air preheating by such recovered waste heat under the following conditions:
  - (1) Temperature reduction of 60°C due to radiated heat loss from the furnace outlet to the heat exchanger for air preheating.
  - (2) Diffusion heat of 5% from the heat exchanger.
  - (3) Fuel is liquid fuel (heavy oil equivalent).
  - (4) Outside air temperature of 20°C.
  - (5) Air ratio of 1.2.

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