In the 13th Five-Year Plan, biomass boilers and waste heat boilers are important renewable energy and recycling energy equipment. Just because the fuel of these boilers is very valuable: renewable, low cost, low pollution, high furnace efficiency, wide coverage and so on. At present, more and more provinces and cities have introduced subsidies for biomass boilers and subsidies for waste heat utilization boilers, which have opened up a good market prospect for the widespread application of biomass boilers and waste heat boilers.
There are many types of biomass fuels. Straw boilers, sugar aldehyde slag boilers, and palm shell boilers have appeared in the boiler market. The furnace types of these boilers are roughly the same, but the parameters of the boiler are different depending on the design of the fuel. The calculation of biomass boiler fuel consumption and the calculation of gas consumption of gas boilers and the calculation of coal consumption of coal-fired boilers are also determined by boiler efficiency and fuel calorific value.
Especially in terms of fuel calorific value, fuel is mostly used for combustion. It is impossible to release the condensation heat of water vapor because all kinds of exhaust gas temperatures exceed the condensation temperature of water vapor. Therefore, the low calorific value of fuel is generally used as the calculation basis in energy utilization. Different countries have different choices. Japan and North America are accustomed to high calorific value. China, the former Soviet Union, Germany and the Organisation for Economic Cooperation and Development are converted by low calorific value, and some countries adopt both calorific values.
1. Calculation of consumption of biomass pellet fuel combustion boiler
Biomass furnace consumption per hour = 600,000 kcal * tonnage / fuel calorific value / boiler combustion efficiency
Take the problem of how much fuel is used in a 10 ton straw steam boiler for 1 hour. 1 ton is 600,000 kcal. Assuming that the fuel heat is 4000kcal and the boiler thermal efficiency is 85%, then a 10 ton biomass biomass pellet boiler needs a fuel quantity of 600000*10/4000/85% for 1 hour, which is about 1800kg/h.
2. Estimation of fuel consumption of each tonnage burning straw boiler (assumed that the conditions are equivalent to the above)
| Fuel requirement of 1 ton briquette biomass boiler for 1 hour is 180 kg/h |
Fuel consumption per hour of 2 ton biomass combustion boilers is 360kg/h |
| Fuel consumption of 4 ton biomass pellet boilers in one hour is 720 kg/h |
Fuel consumption per hour of 5 ton biomass boilers is 900kg/h |
| 1 hour fuel consumption of 6 ton biomass chain steam boiler 1080 kg/h |
Fuel consumption per hour of 8 ton straw fuel boiler is 1440 kg/h |
| Fuel consumption per hour of 10T straw biomass boiler is 1800kg/h |
1 hour fuel consumption of 12 ton biomass boiler 2160 kg/h |
| 1 hour fuel consumption of 15 ton biomass boiler 2700 kg/h |
Fuel consumption per hour of a 20-ton biomass-fired pellet boiler is 3600 kg/h |
| Fuel consumption of 25 ton biomass boilers in one hour is 4500 kg/h |
30 ton biomass pellet steam boiler needs 5400 kg/h fuel per hour |
| Fuel consumption of 35t straw-burning boiler in one hour is 6300kg/h |
Fuel consumption of 40 ton biomass boilers in one hour is 7 200 kg/h |
| The minimum fuel requirement of 45 ton corner tube biomass steam boiler is 8100 kg/h per hour. |
Fuel consumption of 50 tons biomass briquette fuel boiler in one hour is 9000 kg/h |
| A 55-ton biomass pellet-fired boiler needs 9,900 kg/h of fuel per hour |
60 ton biomass boiler consumes 10800 kg/h of straw per hour |
| 1 hour straw fuel consumption of 65 ton boiler 11700 kg/h |
75 ton biomass power boiler consumes 13500 kg/h of biomass per hour |
3. Summary of calorific value of common biomass fuels:
| The calorific value of weed fuel is 3873 kcal/Kg |
The calorific value of straw fuel is 4215 kcal/Kg |
| The calorific value of rice husk fuel is 3828 kcal/Kg |
The calorific value of corn stalk fuel is 4241 kcal/Kg |
| Corn cob fuel calorific value 4238 kcal/Kg |
wheat straw fuel calorific value 4429 kcal/Kg |
| Peanut shell fuel calorific value 5119 kcal/Kg |
Chinese fir fuel calorific value 4587 kcal/Kg |
| The calorific value of pine fuel is 4552 kcal/Kg |
The calorific value of poplar fuel is 4286 kcal/Kg |
| The calorific value of cow manure fuel is 2779 kcal/Kg |
The calorific value of fuelwood fuel is 4003 kcal/Kg |
| Leaf fuel calorific value 3502 kcal/Kg |
Corn stalk fuel calorific value 4241 kcal/Kg |
| Corn cob fuel calorific value 4238 kcal/Kg |
wheat straw fuel calorific value 4429 kcal/Kg |
| The calorific value of straw fuel is 4215 kcal/Kg |
The calorific value of rice husk fuel is 3828 kcal/Kg |
| The calorific value of soybean stalk fuel is 3862 kcal/Kg |
The calorific value of sorghum stalk fuel is 3601 kcal/Kg |
| Cotton stalk fuel calorific value 4323 kcal/Kg |
wood chips fuel calorific value 4401 kcal/Kg |
| The calorific value of wood fuel is 4557 kcal/Kg |
The calorific value of wheat straw fuel is 3649 kcal/Kg |
| Fuel calorific value of glucuronide residue is 3145 kcal/Kg |
Fuel calorific value of wheat straw grain is 4300-4800 kcal/Kg |
Generally speaking, the calorific value of pellet fuel for agricultural raw materials is generally about 3000-4200 KCAL/KG, and that for forestry raw materials is generally higher about 4200-5000 KCAL/KG. After carbonization, the calorific value of forestry pellet fuel is not less than 7000KCAL/KG, which is completely comparable to the required calorific value of standard coal.
At present, the price of all kinds of biomass fuels is generally 600-900 yuan/ton. The fuel cost of a biomass briquette fuel boiler can be estimated according to the biomass fuel consumption per hour of the boiler.
