Notes

Why is biomass a better alternative to natural gas?<br>
Competitors between biomass fuel and natural gas

In recent times, the application of biomass fuel is boosting. In many areas, there arise competitions in between biomass gas as well as natural gas. In this flow, I will take central heating boiler burning for example, and contrast the equipment expense, operation price and also setting effect of biomass boiler as well as natural gas boiler.



This blog compares the financial and also environmental result of biomass fuel as well as gas. The devices cost of biomass central heating boiler is higher than that of gas central heating boiler. Thinking about the high price of natural gas, the yearly operating cost (including the cost of fuel, electricity, labors and also maintenance) of gas is higher than biomass boiler.



When utilizing biomass fuels, it needs to be equipped with dirt enthusiast, sulfur and also nitrate eliminating gadget to guarantee the pollutant discharge meet the standard. As for natural gas central heating boiler, it takes on low-nitrogen combustion innovation or denitrification device to make sure the NOx discharge satisfy the requirement.



Evaluation of biomass energy

Biomass energy is solar power transferred in biomass materials in the form of chemical power. It comes from the photosynthesis of environment-friendly plants. It has the type of strong, liquid and gas. Biomass energy is called a renewable energy.



According to the different resources, the biomass gas can be classified into 6 kinds: plant straw, forestry waste, pet dung, water plants, energy plants, life trash.



Biomass power has the following benefits

Inexpensive, wide circulation, large quantity, renewability, storable, easy to use.



Biomass power likewise has some disadvantages:

Low energy thickness, not suitable for long-distance transportation. To ensure the biomass gas supply, it requires huge room for storage, which brings management trouble.

Crop straw has broad distribution, but it is impacted by areas, periods, climates and various other factors. The supply is not steady. Besides, the calorific value differs a whole lot. Some are not appropriate for boilers.

Different kinds of biomass fuels have various combustion results, which may create slagging and leaves excessive ash. The alkaline web content in the ash will prevent the continual work of biomass central heating boiler and also trigger rust.

Biomass fuels are simple to obtain damp. The dampness web content have great result on the burning temperature level. Over-high wetness material will certainly make the biomass fuel not able to melt.



Economical impact

Devices cost

Take a 4t/h vapor boiler as an example. The mainframe of a DZL horizontal biomass boiler costs around ￥ 180,000, the cost of complementary machinery as well as installation is around ￥ 65,000, so the complete equipment cost is ￥ 245,000.



A WNS series natural gas central heating boiler expenses around ￥ 150,000, the expense of complementary machinery and also installment is ￥ 55,000, so the overall equipment cost is ￥ 205,000. Therefore, the tools cost of biomass boiler is more than that of gas central heating boiler



biomass fuel boilernatural gas boiler.

Yearly operating cost

We still take a 4t/h vapor central heating boiler for example, as well as contrast the yearly procedure price of biomass fuels as well as natural gas central heating boilers. The operation expense of a central heating boiler includes gas price, power consumption, labor cost and also upkeep price



Yearly gas expense.

As an example:

The heat effectiveness of a biomass boiler is 80%.

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

The cost of timber pellets is ￥ 1250/t.

A biomass central heating boiler take in 717kg wood pellet per hour.

The boiler runs for 10 hrs everyday.

The yearly running time is 300days.

By estimation, the annual fuel price is ￥ 2,688,800.



Annual electric fee.

For instance:.

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

The overall power of the reduction box, feeder, water pump as well as conveyor is 10kw.

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

The electrical power rate is ￥ 1.0/ kwh,.

The day-to-day running time is 10 hours.

The yearly operating days are 300 days.

Then the electric fee for a year is ￥ 118,500.



Yearly labor cost.

For example:.

The job has 2 shifts a day.


Each changes require 2 person. pet pelletizer and a water driver.

The wage is ￥ 3000 each.

The labor expense is 144,000 per year.



Yearly maintenance price.

Biomass boiler generally has lots of supporting machinery. Their failure rate is more than gas boiler. chicken manure fertilizer pellet making machine is in percentage to the tools cost. If the upkeep expense is 2.5% of the tools expense, then it is ￥ 6100 each year.



By computation, the yearly running price of biomass central heating boiler is ￥ 2,957,400.



Natural gas boiler.

Yearly gas expense.

For instance.

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

The calorific worth of gas is 35.58 MJ/kg.

The price of natural gas is ￥ 3.1/ m3.

A gas boiler can take in 315m3 gas every hour.

A gas boiler operates 10 hours day-to-day, 300 days yearly.

By estimation, the annual fuel expense is ￥ 2,929,500.



Yearly electrical charge.

The power of the burner is 7.5 kw.

The power of water pump and also other power usage equipment is 7kw.


So the complete electrical power of the biomass boiler is 14.5 kw.

The electrical power rate is ￥ 1.0/ kwh.

The functioning time is 10 hrs on a daily basis, 300 days every year.

So the annual electrical power price is ￥ 43500.



Yearly labor expense.

The job has 2 changes a day.

As the gas boiler has higher automation, as well as the operation is easy, it calls for only 1 fireman.

The salary is ￥ 3000 monthly, so the yearly labor cost is ￥ 72000.



Yearly upkeep expense.

The maintenance work of a gas boiler is not much, the expense is reduced.

Suppose the maintenance price is 1% of the devices cost, then it is ￥ 2100 annually.

By computation, the yearly running expense of a biomass central heating boiler is ￥ 3,047,100.



Final thought.

In regards to the tools cost, biomass boiler is greater than gas central heating boiler. In terms of the yearly running expense, as natural gas boiler has greater automation level, calls for less power consumption device, and also much less maintenance, the electric fee, labor price and also maintenance cost is less than that of biomass boiler. However taking into consideration the high rate of gas, the total operation cost of gas boiler is higher than that of biomass boiler.



Environmental effect.

Biomass fuel.

Scientist gauged the exhaust of smoke, SO2 and also NOx in 2 biomass central heating boiler.



These 2 boilers has comparable evaporation capacity. Both of them are not equipped with sulfur and nitrate getting rid of tool. But the very first one is furnished with a bag-type dirt enthusiast, as well as the second one is geared up with a film-type dust enthusiast.



The boiler equipped with film-type dust enthusiast can minimize the ash discharge properly. In terms of SO2 emission, the wood pellets can satisfy the stipulated standard also without sulfur eliminating device. As for NOx exhaust, the timber pellets can fulfill the criterion in central heating boilers geared up with film-type dust collector.



Gas.

Gas is a premium quality and tidy gas fuel. The fostering of gas in the boiler can decrease the air pollution remarkably. The ash, sulfur and also nitrogen material in the natural gas is reduced. The smoke of gas includes little SOx, which a satisfy specified requirement. Yet the NOx exhaust is still a problem. Investigated found the NOx exhaust of gas central heating boiler is 125mg/m3, and also 25% of them is more than 150mg/m3.



Verdict.

According to the analysis over, the type of biomass gas has wonderful impact on the contaminant exhaust. Wood pellets has much less SO2 exhaust than straw pellets. The biomass boiler with film-type dust enthusiast has better ash removing result than bag-type dust enthusiast.



The NOx emission is past criterion in biomass boilers without sulfur or nitrate getting rid of tool, whatever wood pellets or straw pellets. Therefore, press a pellet is suggest to furnish effective dirt collection agency, as well as sulfur as well as nitrate removing device.



Natural gas has advantages in reducing smoke and SO2 discharge. However with the increasing discharge requirement, even more natural gas central heating boilers will take on low-nitrogen burning modern technology and also nitrate getting rid of device.



The corresponding advantages of natural gas as well as biomass gas.

The rate of biomass central heating boiler is more than gas. Their operating expense is similar thinking about the surge of gas price. Besides, the gas boiler is less complicated to regulate, and it does not take much floor area or fuel storage room.



The price of natural gas is under government control, so it will not change sharply. The gas supply can be ensured when the gas boiler is in usage. Biomass pellets supply is limited by periods. The price as well as supply is unsteady, which typically takes up large stockroom room.



In regards to environmental management, biomass central heating boilers need to be outfitted with dust collector, sulfur and nitrate removing device to guarantee the smoke, SO2 and NOx discharge fulfill the standard. However gas boilers does not need dirt collection agency or desulfurizer, however it require to take on low-nitrogen combustion technology or nitrate eliminating gadget to reduce the NOx discharge. Besides, the gas central heating boiler doesn't require dust cleansing process.



On the other side, biomass fuel is sustainable. It is solar power deposited in plants by photosynthesis. As stats reveal, the biomass energy created by photosynthesis is 173 billion heap, but just 3% of them are utilized. Besides, biomass energy is carbon neutral, which suggests the CO2 intake in its development equates to the exhaust in biomass gas burning.



Fluidized-bed burning is a modern technology based on gas-solid fluidized state. It has good adaptability to biomass fuels, the pollutant gas exhaust is reduced. By including desulfurizer to the fluidized bed, it can eliminate the sulfur directly, as well as decrease the SO2 content in the smoke dramatically.



Nowadays, the fluidized bed can be utilized for the burning of various sort of gas, appropriate for the co-firing of biomass and also coals. The sort of gas and also their percentage is flexible, so you can pick them according the cost to lower your cost.



The high price of gas is a trouble. As well as the cost variation between summertime and wintertime is buckling down. Biomass is an exceptional replacement for traditional gas. To meet the environmental demand and also attain higher cost-effective benefits, it is essential to enhance the application modern technology of biomass gas, and also increase the proportion of biomass in power mix.


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