Analysis and Predicting the Energy Consumption of Low-Pressure Carburising Processes
Abstract
:1. Introduction
- a thin layer of up to approximately 0.5 mm;
- a medium layer of up to approximately 1.5 mm; and
- a thick layer of up to approximately 4 mm.
2. Materials and Methods
2.1. Heat Treatment Processes for Metal and the Operating Parameters of the Vacuum Pit Furnace
2.2. A Case Study
2.3. Research Methodology
- furnace heating temperature;
- average pressure in the furnace chamber; and
- number of carburising cycles and the time taken for carburisation, by the energy consumption of the heating and pump systems.
2.4. Data Collection
- Y1—energy consumption of the pump system;
- Y2—energy consumption of the heating system;
- X1—number of cycles;
- X2—heating temperatures;
- X3—pressure;
- X4—time (min).
3. Results
4. Discussion
- pumping the furnace down to target pressure;
- heating the furnace to the target temperature; and
- maintaining the appointed temperature and pressure during the carburizing process.
- The energy consumption of the pump system depends to a large extent on the number of carburising cycles.
- In subsequent carburising cycles, the furnace pressure level increases with the supply of acetylene, or other technical gases, which means that the furnace’s mechanical pump must operate more efficiently and the demand for electricity increases. Each subsequent carburising cycle requires a reduction in pressure in the furnace chamber, which is a direct result of increased energy consumption by the pumping system.
- The energy consumption of both the pump system and the heating system depends heavily on the duration of the carburising process.
- As stated above, in the introduction, both sub-systems consume the most energy and each minute of the process is associated with a certain consumption of electrical energy.
- The energy consumption of the pumping system depends on the average pressure in the carburising process.
- A relatively efficient pumping system allows a pre-determined vacuum value to be achieved in a relatively short time. The power consumption of the pump system, required for a certain value of the vacuum, is constant.
- The energy consumption of the heating system does not depend to any great extent on the heating temperature.
- It can be assumed that the higher the heating temperature, the greater the energy demand of the heating system. According to the research, obtaining a higher temperature, through the heating system, only requires the consumption of more electricity temporarily. When the set temperature, viz., the maximum electricity consumption, is reached, the energy demand decreases, since only the temperature in the furnace chamber has to be maintained. Therefore, it is possible to obtain better carburisation characteristics by using higher temperatures, at lower pressures and in a shorter time. Such settings of the input parameters will result in a reduction in the energy consumption of the carburisation process.
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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No. | Number of Cycles—X1 | Heating Temperatures—X2 (°C) | Pressure—X3 (mbar) | Time—X4 (min) | Energy Consumption of the Pump System (kWh)—Y1 | Energy Consumption of the Heating System (kWh)—Y2 |
---|---|---|---|---|---|---|
1 | 4 | 930 | 2.70 | 232 | 8.29 | 19.80 |
2 | 4 | 930 | 1.66 | 200 | 7.29 | 16.90 |
3 | 4 | 930 | 2.76 | 290 | 10.13 | 18.55 |
4 | 4 | 1040 | 1.84 | 190 | 6.46 | 19.75 |
5 | 4 | 1040 | 1.56 | 265 | 8.88 | 21.54 |
6 | 5 | 960 | 1.47 | 228 | 8.02 | 18.31 |
7 | 5 | 960 | 1.34 | 318 | 8.38 | 19.75 |
8 | 11 | 860 | 1.10 | 525 | 21.62 | 23.78 |
9 | 11 | 860 | 1.18 | 462 | 19.47 | 22.81 |
10 | 11 | 860 | 3.58 | 474 | 20.08 | 24.09 |
11 | 11 | 950 | 1.62 | 606 | 24.57 | 35.75 |
12 | 11 | 950 | 1.87 | 622 | 24.91 | 31.90 |
13 | 11 | 950 | 1.30 | 581 | 23.64 | 32,97 |
14 | 11 | 950 | 1.38 | 536 | 22.29 | 34.20 |
15 | 22 | 1000 | 1.05 | 2387 | 92.50 | 95.42 |
16 | 22 | 1000 | 5.61 | 2403 | 99.86 | 97.14 |
17 | 22 | 1000 | 6.60 | 2460 | 97.53 | 94.72 |
18 | 25 | 985 | 2.14 | 1314 | 111.72 | 100.79 |
Factors | Correlation | r2 | t | p |
---|---|---|---|---|
Energy consumption of the pump system/number of cycles | 0.9630 | 0.9274 | 14.3021 | 0.0000 |
Energy consumption of the pump system/heating temperatures | 0.3500 | 0.1225 | 1.4948 | 0.1544 |
Energy consumption of the pump system/Pressure | 0.5339 | 0.2851 | 2.5260 | 0.0224 |
Energy consumption of the pump system/time [min] | 0.9274 | 0.8600 | 9.9171 | 0.0000 |
Energy consumption of the heating system/number of cycles | 0.9493 | 0.9011 | 12.07928 | 0.0000 |
Energy consumption of the heating system/heating temperatures | 0.4194 | 0.1759 | 1.8481 | 0.0831 |
Energy consumption of the heating system/Pressure | 0.5266 | 0.2773 | 2.4781 | 0.0247 |
Energy consumption of the heating system/time [min] | 0.9424 | 0.8882 | 11.2754 | 0.0000 |
No. | Number of Cycles—X1 | Heating Temperatures—X2 (°C) | Pressure—X3 (mbar) | A Real Energy Consumption (kWh) | A Prediction for the Energy Consumption (kWh) | |
---|---|---|---|---|---|---|
1 | 11 | 950 | 2.03 | 41.77 | 39.58 | −95.0% Gu = 36.62; +95.0% Gu = 42.57 |
2 | 11 | 950 | 2.01 | 41.44 | 39.55 | −95.0% Gu = 36.57; +95.0% Gu = 42.53 |
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Kłos, S.; Patalas-Maliszewska, J.; Piechowicz, Ł.; Wachowski, K. Analysis and Predicting the Energy Consumption of Low-Pressure Carburising Processes. Energies 2021, 14, 3699. https://doi.org/10.3390/en14123699
Kłos S, Patalas-Maliszewska J, Piechowicz Ł, Wachowski K. Analysis and Predicting the Energy Consumption of Low-Pressure Carburising Processes. Energies. 2021; 14(12):3699. https://doi.org/10.3390/en14123699
Chicago/Turabian StyleKłos, Sławomir, Justyna Patalas-Maliszewska, Łukasz Piechowicz, and Krzysztof Wachowski. 2021. "Analysis and Predicting the Energy Consumption of Low-Pressure Carburising Processes" Energies 14, no. 12: 3699. https://doi.org/10.3390/en14123699