GB 31830-2024 PDF English
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Norm of energy consumption per unit production of toluene diisocyanate and diphenyl methane diisocyanate
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Norm of energy consumption per unit product of diphenyl methane diisocyanate
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GB 31830-2024: Norm of energy consumption per unit production of toluene diisocyanate and diphenyl methane diisocyanate
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB31830-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.010
CCS F 01
Replacing GB 31828-2015, GB 31830-2015
Norm of Energy Consumption Per Unit Production of
Toluene Diisocyanate and Diphenyl Methane Diisocyanate
Issued on: APRIL 29, 2024
Implemented on: MAY 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Norm Level of Energy Consumption... 5
5 Technical Requirements... 5
6 Statistical Range and Calculation Method... 5
Appendix A (Informative) Reference Coefficients of Various Energy Sources
Converted to Standard Coal (Reference Values)... 9
Appendix B (Informative) Equivalent Energy Values of Various Energy-Consumed
Mediums... 11
Norm of Energy Consumption Per Unit Production of
Toluene Diisocyanate and Diphenyl Methane Diisocyanate
1 Scope
This Document specifies the norm levels, technical requirements, and statistical range of energy
consumption per unit production (abbreviated as energy consumption) of toluene diisocyanate
(TDI) and diphenyl methane diisocyanate (MDI); and describes the calculation method for them.
This Document is applicable to the calculation and assessment of energy consumption per unit
production of TDI produced with dinitrotoluene (DNT), hydrogen, chlorine, and carbon
monoxide as raw materials, and MDI produced with aniline, formaldehyde, chlorine, and
carbon monoxide as raw materials, as well as energy consumption control for new construction
and renovation and expansion projects.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 2589 General principles for calculation of total production energy consumption
GB/T 12723 General principles of stipulation of energy consumption norm for unit product
GB/T 13941 Diphenylmethane diisocyanate
GB/T 32469 Plastics - Polyurethane raw materials - Toluene diisocyanate
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB/T 12723 and the
following apply.
3.1 Comprehensive energy consumption of toluene diisocyanate product
During the reporting period, the total amount of various energy actually consumed in the entire
production process of TDI product.
6.1.1 The comprehensive energy consumption of TDI and MDI products includes various
primary energy (raw coal, oil, natural gas, etc.), secondary energy (electricity, heat, petroleum
products, coke, gas, etc.) consumed by the production system, auxiliary production system and
affiliated production system; and energy-consumed mediums used in production (energy
consumed by water, oxygen, compressed air, etc.); excluding energy used in the construction
and renovation process and living energy (referring to the energy used in dormitories, schools,
cultural entertainment, medical care, commercial services and childcare and early childhood
education within the enterprise system).
6.1.2 Energy consumption of TDI and MDI production systems are as follows.
a) Energy consumption of TDI production system includes. Various energy consumption,
using DNT, hydrogen, chlorine, carbon monoxide as raw materials, through
hydrogenation unit, phosgene synthesis unit, phosgenation unit, distillation unit to TDI
product entering finished product tank and sending out by-product hydrogen chloride gas.
b) Energy consumption of MDI production system includes. Various energy consumption,
using aniline, formaldehyde, chlorine, carbon monoxide as raw materials, through
condensation unit, phosgene synthesis unit, phosgenation unit, separation unit to finished
MDI tank area and waste liquid, waste residue, waste gas are sent out after pretreatment.
6.1.3 Energy consumption of auxiliary production system includes. Energy consumption of
power supply, machine repair, water supply, gas supply, heating, refrigeration, instrument repair,
lighting, warehouse and raw material site in the factory, as well as for safety, environmental
protection (waste liquid, waste residue, waste gas are sent out after pretreatment), energy saving
and other devices that facilities serving the production system.
6.1.4 Energy consumption of auxiliary production system includes. Energy consumption of
dispatch room, office, operation room, control room, lounge, dressing room, bathhouse, central
control analysis, product inspection, maintenance section and other facilities specially
configured for the production system.
6.1.5 The waste heat, waste energy and chemical reaction heat generated in the recycling and
utilization production process of TDI and MDI are not included in the energy consumption. If
the waste heat, waste energy and chemical reaction heat are used by other devices outside the
statistical range of 6.1.2 ~ 6.1.4, they shall be deducted from the system according to the
actually used energy.
6.1.6 The statistics and accounting of energy consumption shall include all production links and
systems; and shall neither be repeated nor omitted. The energy consumed by routine overhaul
and storage loss shall be included in the energy consumption of the production system.
6.2 Calculation method
6.2.1 The calculation of comprehensive energy consumption shall comply with the provisions
of GB/T 2589.
6.2.2 The calorific value of various energy sources shall be converted into a unified unit of
measurement, kilograms of standard coal (kgce). The calorific value of various energy sources
shall be based on the actual measured value of the enterprise during the reporting period. If
there is no actual measurement condition, the reference coefficients of various energy sources
for standard coal conversion given in Appendixes A or B may be used for conversion.
6.2.3 The outsourced steam shall be converted into standard coal according to the enthalpy
value of the purchased steam.
6.2.4 The output of TDI and MDI products shall be the physical quantity of qualified products.
TDI products shall meet the quality requirements of GB/T 32469; and qualified MDI products
shall meet the quality requirements of GB/T 13941.
6.2.5 The comprehensive energy consumption of TDI and MDI products shall be calculated
according to Formula (1).
Where.
E - Comprehensive energy consumption of TDI and MDI products, in kilograms of standard
coal (kgce);
m - Number of energy types input into the production system;
eis - Physical quantity of the ith energy input into the production system of TDI and MDI
products;
Ki - The standard coal conversion coefficient of the ith energy input into the production system;
n - Number of energy types input into the auxiliary production system and the subsidiary
production system;
ejf - Physical quantity of the jth energy input into the auxiliary production system and the
subsidiary production system of TDI and MDI products;
Kj - The standard coal conversion coefficient of the jth energy input into the auxiliary production
system and the subsidiary production system;
l - Number of energy types recovered in the production process and used by devices outside the
statistical range;
erh - Physical quantity of the rth energy recovered in the production process of TDI and MDI
products and used by devices outside the statistical range;
Kr – The standard coal conversion coefficient of the rth energy recovered in the production
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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