Project / Steam furnace type |
Fuel name | Thermal efficiency (%) | Burnout rate (%) | Unit price | Consumption / ton of steam | Cost / ton |
Gas boiler |
natural gas | 91 | 99 | 3.5 yuan / Nm3 | 75Nm3 |
262 yuan |
Gas boiler |
LPG | 92 | 99 | 6500 yuan / ton | 60kg |
390 yuan |
Gas boiler |
dimethyl ether | 92 | 99 | 3500 yuan / ton | 100kg |
350 yuan |
Diesel boiler |
Diesel | 85 | 99 | 6000 yuan / ton | 70kg |
420 yuan |
Heavy oil boiler |
Heavy oil | 84 | 98 | 3600 yuan / ton | 75kg |
270 yuan |
Coal-fired boiler |
coal | 67 | 70 | 500 yuan / ton | 200kg |
100 yuan |
Electric boiler |
Electric | 98 | 100 | 1 yuan / degree | 700 degrees | 700 yuan |
1. The rated steam output of 1 ton gas steam boiler is 1 ton per hour, natural gas consumption is 70 cubic meters, and the price of natural gas is calculated according to 3.5 yuan / cubic (the price will vary from place to place).
Gas cost is: 70 * 3.5 = 245 yuan.
2. 1 ton gas-fired steam boiler the main electricity part is the burner and water pump, the others are weak electricity, the burner power is 1.5kw, the pump power is 2.2kw, and the other weak electricity is 2kw. During normal use of the boiler, the electrical power is 0.65 times the full load power. The calculated power consumption is (1.5kw + 2.2kw + 2kw) * 0.65 = 3.7kw electricity fee 1 yuan / degree.
The electricity cost is 3.7kw * 1 = 3.7 yuan / hour.
3. Water cost
A 1 ton steam boiler can turn 1 ton of water into 1 ton of steam in an hour. In the middle, due to sewage and softened water treatment, 1.1 tons of water is required to produce 1 ton of steam during normal use. The water is calculated at 3 yuan / ton.
The water fee is 1.1 * 3 = 3.3 yuan / hour.
5. Labor cost. The gas boiler is a fully automatic boiler. It does not require special personnel to operate. It only needs to go back and forth to inspect manually. An inspector is calculated according to the salary of 2,000 yuan in January, and works 8 hours a day. The cost for one hour is
2000/30/8 = 8.3 yuan / hour.
6. Maintenance cost the gas boiler’s fully automatic boiler has a very low failure rate and very low maintenance cost. For a 1 ton gas steam boiler, 2000 maintenance costs per year are sufficient. According to 365 days a year, 8 hours a day, the maintenance cost of one hour is2000/365/8 = 0.68 yuan / hour.
A total of 1 ton gas-fired steam boiler, when operating at full load, the operating cost is 245 + 3.7 + 3.3 + 8.3 + 0.68 = 252.6 yuan / hour.