Notes

Why is biomass a better choice to gas?<br>
Competition in between biomass fuel as well as gas

Over the last few years, the application of biomass gas is raising. In lots of places, there arise competitors between biomass fuels as well as gas. In this flow, I will take boiler burning as an example, and compare the tools price, operation price as well as atmosphere result of biomass boiler and gas boiler.



This blog compares the economic and also ecological effect of biomass gas as well as natural gas. The equipment expense of biomass central heating boiler is greater than that of gas central heating boiler. Thinking about the high cost of gas, the annual operating cost (including the cost of fuel, electrical power, labors and also maintenance) of natural gas is more than biomass boiler.



When using biomass fuels, it calls for to be geared up with dirt collector, sulfur and nitrate getting rid of tool to make sure the contaminant discharge meet the criterion. When it comes to natural gas central heating boiler, it takes on low-nitrogen burning technology or denitrification gadget to make certain the NOx emission satisfy the standard.



Analysis of biomass energy

Biomass power is solar power deposited in biomass materials in the form of chemical power. It comes from the photosynthesis of environment-friendly plants. It has the kind of solid, liquid as well as gas. Biomass power is known as a renewable energy.



According to the different resources, the biomass gas can be identified right into 6 kinds: crop straw, forestry waste, animal dung, water plants, energy plants, life waste.



Biomass energy has the adhering to benefits

Affordable, wide distribution, big volume, renewability, storable, easy to use.



Biomass power additionally has some downsides:


Reduced energy density, not appropriate for long-distance transport. To guarantee the biomass fuel supply, it needs huge room for storage space, which brings monitoring issue.

Plant straw has broad circulation, yet it is impacted by regions, periods, weather conditions as well as various other elements. The supply is not steady. Besides, the calorific value differs a whole lot. Some are not suitable for central heating boilers.

Various sort of biomass gas have various burning effects, which may trigger slagging and leaves way too much ash. grain pellet machine in the ash will prevent the continual job of biomass boiler and cause deterioration.

Biomass gas are simple to obtain damp. The wetness content have excellent impact on the burning temperature level. Over- manual animal feed pellet machine will certainly make the biomass fuel unable to melt.



Economical effect

Tools cost

Take a 4t/h vapor central heating boiler as an example. The mainframe of a DZL straight biomass central heating boiler prices around ￥ 180,000, the cost of auxiliary machinery as well as installment is around ￥ 65,000, so the overall devices price is ￥ 245,000.



A WNS collection natural gas boiler prices around ￥ 150,000, the cost of supporting machinery and also installment is ￥ 55,000, so the overall devices price is ￥ 205,000. Consequently, the tools expense of biomass boiler is greater than that of natural gas boiler



biomass fuel boilernatural gas central heating boiler.

Yearly operating cost

We still take a 4t/h vapor boiler for instance, and compare the annual procedure cost of biomass fuels as well as natural gas boilers. The operation cost of a central heating boiler includes fuels cost, electrical energy intake, labor cost and upkeep expense



Yearly fuel price.

As an example:

The warmth efficiency of a biomass boiler is 80%.

The calorific value of biomass fuel is 17.58 MJ/kg at least.

The expense of timber pellets is ￥ 1250/t.

A biomass boiler eat 717kg timber pellet per hour.

The boiler competes 10 hours everyday.

The yearly running time is 300days.

By calculation, the annual gas price is ￥ 2,688,800.



Annual electric fee.

For example:.

The total power of a pressure and induce draft enjoyable is 29.5 kw.

The overall power of the decrease box, feeder, water pump and also conveyor is 10kw.

Then the complete power of the biomass boiler is 39.5 kw.

The electricity cost is ￥ 1.0/ kwh,.

The daily running time is 10 hours.

The yearly operating days are 300 days.

Then the electrical cost for a year is ￥ 118,500.



Annual labor expense.

For example:.

The job has two changes a day.

Each changes need 2 person. A firefighter and also a water driver.

The wage is ￥ 3000 per person.

The labor expense is 144,000 per year.



Annual maintenance price.

Biomass central heating boiler typically has many auxiliary equipment. Their failing rate is more than gas central heating boiler. The annual maintenance expense is in proportion to the tools expense. If the maintenance expense is 2.5% of the devices cost, after that it is ￥ 6100 yearly.



By estimation, the annual running cost of biomass central heating boiler is ￥ 2,957,400.



Gas boiler.

Annual gas cost.

For instance.

The heat efficiency of biomass central heating boiler is 90%.

The calorific worth of natural gas is 35.58 MJ/kg.

The rate of natural gas is ￥ 3.1/ m3.

A gas boiler can consume 315m3 gas every hour.

A gas central heating boiler runs 10 hours daily, 300 days yearly.

By estimation, the annual gas price is ￥ 2,929,500.



Annual electrical charge.

The power of the heater is 7.5 kw.

The power of water pump and also various other power utilization devices is 7kw.

So the total electric power of the biomass central heating boiler is 14.5 kw.

The electrical energy price is ￥ 1.0/ kwh.

The functioning time is 10 hours daily, 300 days each year.

So the yearly electrical power expense is ￥ 43500.



Annual labor cost.

The work has 2 changes a day.

As the gas boiler has greater automation, as well as the procedure is easy, it requires only 1 firefighter.

The salary is ￥ 3000 per month, so the annual labor expense is ￥ 72000.



Annual upkeep price.

The maintenance job of a gas boiler is very little, the cost is reduced.

Intend the maintenance price is 1% of the equipment expense, after that it is ￥ 2100 yearly.

By computation, the annual running price of a biomass boiler is ￥ 3,047,100.



Conclusion.

In regards to the tools cost, biomass central heating boiler is more than natural gas boiler. In regards to the annual running cost, as gas boiler has higher automation level, needs much less power consumption tool, and less maintenance, the electric charge, labor price as well as upkeep cost is lower than that of biomass boiler. Yet thinking about the high price of natural gas, the complete operation expense of natural gas central heating boiler is more than that of biomass boiler.



Ecological effect.

Biomass gas.

Researchers gauged the discharge of smoke, SO2 and NOx in 2 biomass boiler.



These 2 central heating boilers has similar dissipation capacity. Both of them are not equipped with sulfur as well as nitrate getting rid of gadget. However the initial one is geared up with a bag-type dust collection agency, and also the 2nd one is equipped with a film-type dirt enthusiast.



The central heating boiler furnished with film-type dust collection agency can minimize the ash exhaust efficiently. In regards to SO2 exhaust, the timber pellets can fulfill the stipulated criterion even without sulfur eliminating device. As for NOx exhaust, the timber pellets can fulfill the standard in boilers furnished with film-type dust enthusiast.



Gas.

Gas is a high quality as well as tidy gas fuel. The adoption of natural gas in the central heating boiler can minimize the air pollution incredibly. The ash, sulfur and nitrogen web content in the gas is low. The smoke of natural gas includes little SOx, which a fulfill specified standard. But the NOx discharge is still an issue. Looked into located the NOx exhaust of natural gas central heating boiler is 125mg/m3, and 25% of them is more than 150mg/m3.



Verdict.

According to the evaluation over, the kind of biomass gas has excellent influence on the pollutant exhaust. Timber pellets has less SO2 emission than straw pellets. The biomass boiler with film-type dust collection agency has far better ash removing effect than bag-type dirt enthusiast.



The NOx emission is beyond criterion in biomass boilers without sulfur or nitrate getting rid of gadget, whatever timber pellets or straw pellets. As a result, it is suggest to gear up efficient dirt collector, as well as sulfur as well as nitrate getting rid of tool.



Natural gas has advantages in reducing smoke and SO2 exhaust. However with the enhancing emission requirement, even more natural gas boilers will certainly embrace low-nitrogen burning innovation as well as nitrate getting rid of tool.



The respective benefits of gas and biomass gas.

The cost of biomass central heating boiler is more than gas. Their operating expense is comparable thinking about the surge of gas price. Besides, the natural gas boiler is simpler to control, as well as it does not take much floor space or fuel storage room.



The price of gas is under federal government control, so it won't vary greatly. The gas supply can be assured when the gas central heating boiler is in use. Biomass pellets supply is limited by seasons. The rate and supply is unstable, which generally occupies large storehouse room.



In regards to environmental management, biomass central heating boilers have to be furnished with dust collector, sulfur and also nitrate removing device to make certain the smoke, SO2 as well as NOx discharge fulfill the criterion. Yet gas central heating boilers doesn't need dust collection agency or desulfurizer, yet it need to adopt low-nitrogen burning innovation or nitrate eliminating gadget to cut the NOx discharge. Besides, the natural gas boiler doesn't require dirt cleaning process.



Beyond, biomass fuel is eco-friendly. It is solar power deposited in plants by photosynthesis. As statistics show, the biomass power generated by photosynthesis is 173 billion bunch, yet just 3% of them are made use of. Besides, biomass energy is carbon neutral, which implies the CO2 usage in its development amounts to the emission in biomass gas burning.




Fluidized-bed burning is an innovation based upon gas-solid fluidized state. It has good adaptability to biomass gas, the contaminant gas emission is reduced. By including desulfurizer to the fluidized bed, it can remove the sulfur directly, and minimize the SO2 material in the smoke dramatically.



Nowadays, the fluidized bed can be used for the combustion of various kinds of fuels, appropriate for the co-firing of biomass as well as coals. The sort of fuels and also their percentage is adjustable, so you can pick them according the rate to reduce your expense.



The high cost of gas is a problem. As well as the cost variation in between summer and wintertime is buckling down. Biomass is an excellent replacement for standard fuels. To fulfill the ecological demand and also accomplish greater affordable benefits, it is essential to enhance the application technology of biomass fuel, and enhance the percentage of biomass in energy mix.


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