In recent times, the application of biomass gas is enhancing. Inhop pelletizer , there emerge competitions between biomass gas and gas. In this passage, I will take boiler burning for example, as well as compare the devices cost, procedure price as well as environment effect of biomass central heating boiler and also gas central heating boiler.
This blog compares the economic and environmental effect of biomass fuel and natural gas. The tools price of biomass boiler is greater than that of natural gas boiler. Taking into consideration the high price of natural gas, the annual operating expense (consisting of the price of fuel, electrical power, labors as well as upkeep) of natural gas is more than biomass boiler.
When using biomass fuels, it needs to be outfitted with dirt collection agency, sulfur and also nitrate eliminating device to make certain the contaminant emission fulfill the standard. As for gas boiler, it embraces low-nitrogen burning technology or denitrification device to ensure the NOx emission satisfy the requirement.
Analysis of biomass energy
Biomass energy is solar power transferred in biomass materials in the form of chemical energy. It originates from the photosynthesis of environment-friendly plants. It has the type of strong, fluid and gas. Biomass energy is referred to as a renewable resource.
According to the various resources, the biomass fuels can be identified right into 6 kinds: plant straw, forestry waste, pet dung, aquatic plants, power plants, life rubbish.
Biomass power has the complying with advantages
Low cost, large circulation, large quantity, renewability, storable, easy to use.
Biomass energy likewise has some drawbacks:
Reduced energy density, not appropriate for long-distance transportation. To ensure the biomass fuel supply, it needs large space for storage, which brings administration problem.
Crop straw has large distribution, yet it is influenced by regions, periods, weather conditions as well as various other factors. The supply is not secure. Besides, the calorific value varies a great deal. Some are not ideal for boilers.
Various sort of biomass fuels have different combustion impacts, which might trigger slagging as well as leaves way too much ash. The alkaline content in the ash will certainly impede the continual work of biomass boiler and also trigger rust.
Biomass gas are very easy to get damp. The wetness material have excellent effect on the burning temperature. Over-high wetness content will certainly make the biomass fuel incapable to melt.
Cost-effective effect
Tools expense
Take a 4t/h vapor boiler for example. The mainframe of a DZL straight biomass central heating boiler prices around 180,000, the expense of auxiliary machinery and installment is around 65,000, so the overall devices expense is 245,000.
A WNS collection gas boiler costs around 150,000, the price of complementary equipment and installation is 55,000, so the overall equipment price is 205,000. Therefore, the equipment expense of biomass central heating boiler is more than that of natural gas central heating boiler
biomass fuel boilernatural gas boiler.
Yearly operating expense
We still take a 4t/h vapor boiler for instance, and compare the yearly procedure expense of biomass gas and natural gas boilers. The operation expense of a central heating boiler consists of gas expense, electrical power usage, labor price as well as maintenance price
Annual fuel price.
For instance:
The heat efficiency of a biomass central heating boiler is 80%.
The calorific value of biomass gas is 17.58 MJ/kg at the very least.
The cost of wood pellets is 1250/t.
A biomass central heating boiler eat 717kg timber pellet per hour.
The central heating boiler runs for 10 hours daily.
The annual running time is 300days.
By computation, the yearly fuel price is 2,688,800.
Annual electrical cost.
For instance:.
The overall power of a pressure and also cause draft enjoyable is 29.5 kw.
The overall power of the reduction box, feeder, water pump and also conveyor is 10kw.
Then the overall power of the biomass boiler is 39.5 kw.
The electricity rate is 1.0/ kwh,.
The everyday running time is 10 hrs.
The yearly operating days are 300 days.
After that the electrical fee for a year is 118,500.
Yearly labor price.
For instance:.
The job has 2 changes a day.
Each shifts need 2 person. A firefighter and a water driver.
The wage is 3000 each.
The labor cost is 144,000 annually.
Annual maintenance price.
Biomass central heating boiler typically has several complementary machinery. Their failure rate is more than gas boiler. The yearly maintenance price is in percentage to the tools expense. If the upkeep price is 2.5% of the devices expense, then it is 6100 yearly.
By computation, the yearly running cost of biomass boiler is 2,957,400.
Gas central heating boiler.
Yearly fuel cost.
For instance.
The warm efficiency of biomass central heating boiler is 90%.
The calorific value of gas is 35.58 MJ/kg.
The price of gas is 3.1/ m3.
A gas boiler can consume 315m3 gas every hr.
A gas central heating boiler operates 10 hrs everyday, 300 days yearly.
By computation, the yearly fuel price is 2,929,500.
Annual electrical cost.
The power of the heater is 7.5 kw.
The power of water pump and various other power utilization tools is 7kw.
So the complete electric power of the biomass boiler is 14.5 kw.
The electrical power rate is 1.0/ kwh.
The working time is 10 hours everyday, 300 days annually.
So the annual electricity expense is 43500.
Yearly labor cost.
The work has 2 shifts a day.
As the gas central heating boiler has higher automation, as well as the procedure is straightforward, it needs only 1 fire fighter.
The income is 3000 each month, so the yearly labor cost is 72000.
Annual upkeep price.
The upkeep work of a gas central heating boiler is not much, the expense is reduced.
Mean the upkeep expense is 1% of the tools expense, then it is 2100 yearly.
By computation, the annual running cost of a biomass central heating boiler is 3,047,100.
Verdict.
In regards to the devices price, biomass central heating boiler is greater than gas central heating boiler. In regards to the annual running price, as natural gas boiler has greater automation level, requires much less power intake tool, and much less upkeep, the electrical fee, labor expense and upkeep cost is lower than that of biomass central heating boiler. But thinking about the high price of natural gas, the total operation cost of natural gas boiler is more than that of biomass central heating boiler.
Ecological result.
Biomass gas.
Researchers measured the exhaust of smoke, SO2 as well as NOx in 2 biomass boiler.
These 2 central heating boilers has comparable dissipation capacity. Both of them are not equipped with sulfur and nitrate getting rid of gadget. However the initial one is furnished with a bag-type dirt collector, and also the 2nd one is furnished with a film-type dust enthusiast.
The central heating boiler outfitted with film-type dust collector can decrease the ash discharge efficiently. In regards to SO2 emission, the wood pellets can fulfill the stated standard also without sulfur eliminating gadget. When it comes to NOx discharge, the timber pellets can satisfy the requirement in boilers furnished with film-type dirt enthusiast.
Natural gas.
Natural gas is a top quality and also tidy gas fuel. The fostering of natural gas in the central heating boiler can lower the air pollution remarkably. The ash, sulfur and nitrogen material in the gas is reduced. The smoke of gas includes little SOx, which a satisfy specified requirement. Yet the NOx emission is still a problem. Investigated discovered the NOx exhaust of gas boiler is 125mg/m3, and 25% of them is more than 150mg/m3.
Verdict.
According to the evaluation above, the sort of biomass gas has terrific influence on the pollutant emission.2nd hand pellet machinehas less SO2 emission than straw pellets. The biomass boiler with film-type dust enthusiast has far better ash getting rid of result than bag-type dirt enthusiast.
The NOx discharge is past standard in biomass central heating boilers without sulfur or nitrate eliminating gadget, whatever wood pellets or straw pellets. For that reason, it is advise to gear up efficient dust collector, and sulfur as well as nitrate eliminating tool.
Natural gas has advantages in reducing smoke as well as SO2 emission. Yet with the boosting exhaust requirement, more natural gas boilers will embrace low-nitrogen combustion technology and nitrate removing device.
The respective advantages of gas and also biomass gas.
The cost of biomass boiler is greater than natural gas. Their operating cost is comparable considering the increase of natural gas rate. Besides, the natural gas central heating boiler is simpler to manage, and also it does not take much flooring space or gas storeroom.
The price of gas is under federal government control, so it won't change dramatically. The natural gas supply can be guaranteed when the gas central heating boiler is in use. Biomass pellets supply is limited by seasons. The rate and also supply is unpredictable, which generally uses up big warehouse room.
In regards to environmental management, biomass central heating boilers need to be geared up with dirt collection agency, sulfur and also nitrate getting rid of tool to make certain the smoke, SO2 and also NOx emission satisfy the criterion. However gas boilers does not need dust enthusiast or desulfurizer, however it require to embrace low-nitrogen combustion technology or nitrate getting rid of tool to reduce the NOx discharge. Besides, the natural gas central heating boiler does not need dirt cleansing process.
On the other side, biomass gas is renewable. It is solar energy transferred in plants by photosynthesis. As stats reveal, the biomass power generated by photosynthesis is 173 billion bunch, but only 3% of them are made use of. Besides, biomass energy is carbon neutral, which suggests the CO2 intake in its development amounts to the discharge in biomass gas burning.
Fluidized-bed burning is a technology based upon gas-solid fluidized state. It has great adaptability to biomass fuels, the contaminant gas exhaust is low. By including desulfurizer to the fluidized bed, it can remove the sulfur directly, and also decrease the SO2 web content in the smoke greatly.
Nowadays, the fluidized bed can be utilized for the combustion of various type of gas, ideal for the co-firing of biomass and coals. The sort of fuels as well as their proportion is adjustable, so you can choose them according the rate to decrease your price.
The high price of gas is a problem. And also the cost disparity in between summer season as well as winter season is getting serious. Biomass is an outstanding replacement for traditional fuels. To fulfill the ecological requirement and also attain greater economical benefits, it is necessary to enhance the application innovation of biomass gas, and increase the proportion of biomass in energy mix.
