Notes

Why is biomass a much better option to gas?<br>
Competitors between biomass gas and also natural gas


Recently, the application of biomass gas is enhancing. In lots of locations, there emerge competitions between biomass fuels as well as gas. In this passage, I will take central heating boiler burning for example, and also compare the tools cost, procedure cost and setting effect of biomass boiler and also gas boiler.



This blog compares the economic and also environmental effect of biomass fuel and also natural gas. The tools cost of biomass boiler is greater than that of natural gas boiler. Considering the high rate of gas, the annual operating cost (consisting of the expense of fuel, electrical power, labors and maintenance) of gas is greater than biomass central heating boiler.



When using biomass gas, it requires to be furnished with dust collection agency, sulfur as well as nitrate eliminating tool to ensure the pollutant exhaust satisfy the criterion. When it comes to gas boiler, it embraces low-nitrogen combustion innovation or denitrification device to make certain the NOx discharge satisfy the standard.




Evaluation of biomass power

Biomass power is solar energy transferred in biomass materials in the form of chemical energy. It originates from the photosynthesis of environment-friendly plants. It has the form of strong, liquid and gas. Biomass power is referred to as a renewable resource.



According to the different sources, the biomass gas can be identified right into 6 kinds: plant straw, forestry waste, pet dung, water plants, energy plants, life rubbish.



Biomass energy has the complying with advantages

Low cost, large circulation, huge volume, renewability, storable, easy to use.



Biomass power likewise has some negative aspects:

Low energy thickness, not appropriate for long-distance transport. To guarantee the biomass gas supply, it calls for large space for storage, which brings management trouble.

Plant straw has wide circulation, but it is affected by areas, periods, climates as well as other aspects. The supply is not secure. Besides, the calorific worth differs a whole lot. Some are not suitable for central heating boilers.

Different type of biomass fuels have various burning effects, which might create slagging as well as leaves excessive ash. The alkaline web content in the ash will certainly impede the constant work of biomass central heating boiler and also cause deterioration.

Biomass fuels are easy to obtain damp. The dampness material have fantastic impact on the burning temperature. Over-high dampness web content will certainly make the biomass gas not able to shed.



Economical impact

Devices cost

Take a 4t/h heavy steam boiler as an example. The data processor of a DZL horizontal biomass boiler prices around ￥ 180,000, the price of auxiliary machinery and also installation is around ￥ 65,000, so the complete devices price is ￥ 245,000.



A WNS collection gas boiler expenses around ￥ 150,000, the expense of supporting machinery and also setup is ￥ 55,000, so the overall tools cost is ￥ 205,000. Consequently, the devices cost of biomass central heating boiler is higher than that of natural gas central heating boiler



biomass gas boilernatural gas boiler.

Yearly operating expense

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



Annual fuel price.

As an example:

The warmth effectiveness of a biomass central heating boiler is 80%.

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

The expense of wood pellets is ￥ 1250/t.

A biomass boiler eat 717kg timber pellet per hr.

The boiler competes 10 hours day-to-day.

The yearly running time is 300days.

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



Annual electrical charge.

For example:.

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

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

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

The electrical power price is ￥ 1.0/ kwh,.

The daily running time is 10 hrs.

The yearly operating days are 300 days.

After that the electric cost for a year is ￥ 118,500.



Annual labor price.

For example:.

The job has 2 shifts a day.

Each shifts need 2 individual. A fire fighter as well as a water operator.

The salary is ￥ 3000 each.

The labor expense is 144,000 annually.



Annual upkeep cost.

Biomass central heating boiler usually has several auxiliary equipment. Their failing price is more than gas boiler. The yearly maintenance expense remains in percentage to the devices price. If the maintenance expense is 2.5% of the devices expense, then it is ￥ 6100 annually.



By computation, the yearly running expense of biomass boiler is ￥ 2,957,400.



Gas central heating boiler.

Annual fuel price.

For instance.

The warm efficiency of biomass boiler is 90%.

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

The cost of natural gas is ￥ 3.1/ m3.

A gas central heating boiler can eat 315m3 gas every hr.

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

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



Yearly electric charge.

The power of the burner is 7.5 kw.

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

So the overall electrical power of the biomass central heating boiler is 14.5 kw.

The power price is ￥ 1.0/ kwh.

The working time is 10 hrs each day, 300 days each year.

So the yearly electrical energy expense is ￥ 43500.



Annual labor expense.

The job has 2 shifts a day.

As the gas central heating boiler has higher automation, and the operation is easy, it requires just 1 firefighter.

The income is ￥ 3000 each month, so the yearly labor price is ￥ 72000.



Annual maintenance cost.

The maintenance work of a gas boiler is very little, the price is reduced.

Intend the upkeep price is 1% of the devices expense, then it is ￥ 2100 every year.

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



Final thought.

In terms of the devices price, biomass boiler is higher than gas boiler. In regards to the annual running price, as gas boiler has greater automation degree, needs much less power intake device, and also much less maintenance, the electrical cost, labor price as well as maintenance cost is less than that of biomass central heating boiler. But considering the high rate of natural gas, the overall operation price of gas boiler is higher than that of biomass central heating boiler.



Ecological result.

Biomass gas.

Scientist measured the discharge of smoke, SO2 and NOx in 2 biomass central heating boiler.



These 2 boilers has similar dissipation capacity. Both of them are not outfitted with sulfur and nitrate getting rid of tool. However the first one is outfitted with a bag-type dirt collection agency, and the second one is outfitted with a film-type dirt collector.



The boiler geared up with film-type dirt collector can lower the ash emission effectively. In terms of SO2 exhaust, the wood pellets can fulfill the stated requirement even without sulfur removing tool. As for NOx emission, the timber pellets can fulfill the criterion in central heating boilers furnished with film-type dirt collection agency.



Natural gas.

Natural gas is an excellent quality as well as clean gas fuel. The fostering of gas in the boiler can minimize the air pollution extremely. The ash, sulfur as well as nitrogen content in the natural gas is low. The smoke of gas contains little SOx, which a meet stated standard. However the NOx discharge is still an issue. Looked into discovered the NOx exhaust of gas central heating boiler is 125mg/m3, and 25% of them is greater than 150mg/m3.



Verdict.

According to the analysis above, the sort of biomass fuel has wonderful impact on the contaminant discharge. Timber pellets has less SO2 emission than straw pellets. The biomass boiler with film-type dust collector has better ash getting rid of impact than bag-type dust collection agency.



The NOx exhaust is beyond standard in biomass boilers without sulfur or nitrate eliminating tool, whatever timber pellets or straw pellets. Therefore, it is suggest to equip reliable dust collection agency, as well as sulfur and also nitrate removing device.



Gas has advantages in cutting smoke and also SO2 emission. However with feed pellet maker machine enhancing emission criterion, more gas central heating boilers will adopt low-nitrogen combustion innovation and nitrate removing tool.



The corresponding benefits of gas as well as biomass gas.

The rate of biomass central heating boiler is greater than gas. Their operating expense is comparable thinking about the increase of gas rate. Besides, the natural gas boiler is simpler to regulate, as well as it doesn't take much floor room or fuel storage room.



The price of natural gas is under federal government control, so it will not vary sharply. The natural gas supply can be guaranteed when the gas boiler remains in use. Biomass pellets supply is limited by seasons. The cost as well as supply is unsteady, which generally takes up huge storage facility room.



In regards to environmental management, biomass boilers need to be outfitted with dust collection agency, sulfur and also nitrate eliminating tool to guarantee the smoke, SO2 and also NOx discharge satisfy the standard. Yet natural gas central heating boilers doesn't need dirt collection agency or desulfurizer, however it require to adopt low-nitrogen combustion modern technology or nitrate eliminating device to cut the NOx exhaust. Besides, the natural gas central heating boiler does not need dirt cleansing procedure.



Beyond, biomass gas is sustainable. It is solar energy transferred in plants by photosynthesis. As stats show, the biomass power produced by photosynthesis is 173 billion ton, yet just 3% of them are made use of. Besides, biomass power is carbon neutral, which implies the carbon dioxide intake in its growth amounts to the emission in biomass gas burning.



Fluidized-bed combustion is an innovation based upon gas-solid fluidized state. It has great flexibility to biomass fuels, the pollutant gas discharge is reduced. By adding small wood pellet making machine to the fluidized bed, it can eliminate the sulfur directly, and also decrease the SO2 content in the smoke sharply.



Nowadays, the fluidized bed can be made use of for the burning of different type of fuels, suitable for the co-firing of biomass as well as coals. The kind of gas and also their proportion is adjustable, so you can pick them according the price to decrease your cost.



The high cost of natural gas is a trouble. As well as the rate difference in between summer as well as winter season is getting serious. Biomass is an outstanding substitute for standard gas. To satisfy the environmental need and attain higher cost-effective benefits, it is essential to boost the application technology of biomass gas, as well as raise the percentage of biomass in power mix.


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