GB/T 37390-2019Guides for energy efficiency assessment of hot rolling process (English PDF)

6.1 Process boundary division

The boundary of hot rolling process starts from the input of raw materials (casting blank), energy, and energy-consumed medium, and ends with the output of final product (rolled material) and steam for external supply.

See Appendix A for the boundary division of hot rolling process.

6.2 Energy consumption statistical range

The energy consumption statistical range of hot rolling process is as follows:

a) Hot rolling production process, including raw material preparation, heating, rolling, cooling, and finishing, etc.;

b) Contain auxiliary production systems such as machine repair, inspection, testing, measuring, transportation, production management and dispatching systems, heating or cooling, lighting, warehousing;

c) Contain the amount of loss of various energies in hot rolling process interface.

The above-mentioned energy consumption statistical range shall deduct the steam recovered and externally-supplied; and does not include the energy consumed by facilities for life purposes (such as canteen, lounge, etc.) which are not related to production.

7.1 Baseline conditions

7.1.1 Baseline conditions are a number of measurable factors which have a greater impact on the baseline energy consumption; and can be classified into objective factors and subjective factors.

7.1.2 The objective factors refer to factors which are affected by the inherent conditions outside the process boundary and are not controllable within the process. They mainly refer to raw material conditions, product conditions, geographical environment, climate temperature, etc.

7.1.3 The subjective factors are factors related to the enterprise's own management level, technical equipment level, operation level, etc. Through the ways such as technical equipment optimization and management level Field data acquisition includes but is not limited to the following contents. The process parameters shall take the data under stable production conditions. The amount of change shall take the average of statistical reporting period:

a) Yield information, including production scale, quantity of qualified products during the statistical reporting period, etc.;

b) Raw material conditions, including raw material cross-section specifications, steel grade, composition, etc.;

c) Product conditions, including product type, specifications, dimensions, etc.;

d) Consumption situation of energy and energy-consumed medium, such as consumption of circulating water, electricity, compressed air, nitrogen, natural gas, coal gas, etc.;

e) Energy recovery situation, such as steam recovery amount, pressure, temperature, etc.;

f) Parameters of main energy-consumed units and important energy-consumed equipment, such as the main parameters of heating furnace, rolling mill, water treatment, and other systems; g) Ambient temperature.

8.3 Actual energy consumption

The actual energy consumption shall be calculated according to formula (3): regulations, policies, and mandatory standards;

b) Whether backward processes and equipment which are prohibited or eliminated by explicit order are used;

c) Use situation of new energy saving processes, new technologies, and new products recommended by the state and industry.

10.2 Energy measuring instrument equipping and monitoring analysis

Energy measuring instrument equipping and monitoring analysis shall include but is not limited to the following:

a) According to the requirements of GB 17167 and GB/T 21368, analyze the scientific and rationality of the equipping plan for energy measuring instrument in the hot rolling process;

b) The energy use state of hot rolling process can be monitored by referring to GB/T 15316.

10.3 Energy efficiency level analysis

The energy efficiency level analysis shall include but is not limited to the following:

a) Energy efficiency analysis of hot rolling process;

b) Energy efficiency analysis of important equipment. GB 18613, GB 30254,

GB 19761, GB 19762 can be referred to;

c) Energy unit consumption analysis;

d) Energy management analysis. GB/T 30258 can be referred to;

e) Rationality analysis of electricity usage. GB/T 3485 can be referred to;

f) Rationality analysis of heat usage. GB/T 3486 can be referred to;

g) Energy saving potential analysis and energy system optimization. GB/T 30715 can be referred to.