Evaluation of environmental benefits of solar water heating system
Issue Time:2017-04-24
We know that the solar hot water system is good, solar energy has been the country's requirements, has been included in the national work plan, one can see the importance of solar energy utilization. Today, the small solar engineering company I will give you a brief introduction of solar water heating system based on the evaluation of environmental benefits and practical visible environmental benefits.
The environmental benefits of solar water heating system are reflected in the reduction of pollutant emissions due to the reduction of conventional energy sources. In the calculation of these indicators, the first part of the life of the system should be converted into the standard energy of the quality of coal, the calculation formula (13)
The quality of standard coal can be saved by kg in the formula Coal-;
N- system life cycle;
According to the QS- type (3) and (3) calculation.
The system has been running for 15 years and the quality of the standard coal is as follows: Coal=18548 tons
3.6.1 carbon dioxide emission reduction assessment
Because of the different carbon content of different energy sources, the amount of carbon dioxide produced during combustion varies. The amount of carbon dioxide emission reduction common calculation method is: according to the auxiliary energy used by the system, the energy conversion system under different conditions during the life of the quality standard of coal; carbon emissions multiplied by the factor corresponding to the energy, will be converted into standard coal carbon content in the carbon content of the energy; then calculate the solar hot water system of carbon dioxide emissions reductions. The formula is (14).
Kg carbon dioxide emission reduction in the life cycle of type QCO2- system;
Coal- saves the quality of standard coal in the life period, kg;
FCO2- carbon emission factor, see table 1.
Substitution formula
To replace coal, 15 years of carbon dioxide emissions: QCO2=49375t
Auxiliary energy
Natural gas
Carbon emission factor (kg carbon /kg standard coal)
Zero point seven two six
Zero point five three four
Zero point four zero four
Zero point eight six six
Table 1 carbon emission factors
3.6.2 sulfur dioxide emission reduction assessment
According to the calculation method of environmental protection department, the sulfur dioxide emissions from domestic sources can be calculated by formula (15).
Life = life source SO2 emissions and other coal consumption rate of 0.8 * 2 * * sulfur (15)
In the actual use of the coal sulfur content is unknown, is calculated per kg of standard coal 0.02kg emissions of sulfur dioxide, sulfur dioxide emissions formula (16).
Qso2=0.02Coal (16)
Type Qso2- system in the life cycle of sulfur dioxide emission reduction, kg.
15 years of sulfur dioxide emissions: Qso2=370.96t
Evaluation of 3.6.3 emission reduction
The reduction of smoke and dust is related to the amount of smoke and dust and the removal rate of the dust removal facilities. For example, the use of vibration furnace burning 1t coal, coal ash is 18%, then produce 36kg smoke.
Calculation of soot emissions should be taken into account when the dust removal facilities such as ETA, calculation type (17)
QYCP=Efs (1-) (17)
Formula QYCP- soot emissions, kg;
Efs- soot production, kg;
The removal rate of N - dust removal facilities.
If you do not know the removal rate, can be calculated according to the standard 0.01kg emission reduction of soot emissions per kg standard coal, see formula (18).
QYCP=0.01Coal (18)
15 years of soot emissions: QYCP= 185.48t
4 Summary
Through the above, the use of solar energy hot water system project after the section of energy significantly, give full play to the advantages of renewable energy solar energy, energy saving and emission reduction to make a contribution.