Notes

Why is biomass a better option to gas?<br>
Competition between biomass fuel and gas

Recently, the application of biomass fuel is increasing. In numerous areas, there arise competitions between biomass gas and also gas. In this flow, I will certainly take central heating boiler burning for instance, as well as compare the devices price, operation expense as well as environment impact of biomass boiler and natural gas boiler.



This blog site compares the financial as well as environmental impact of biomass fuel and also natural gas. The equipment price of biomass boiler is more than that of gas boiler. Considering the high cost of natural gas, the annual operating cost (including the cost of gas, electricity, labors and upkeep) of gas is higher than biomass boiler.




When utilizing biomass gas, it needs to be equipped with dirt collection agency, sulfur and also nitrate eliminating device to guarantee the contaminant emission meet the standard. When it comes to natural gas boiler, it adopts low-nitrogen burning innovation or denitrification device to guarantee the NOx exhaust 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 eco-friendly plants. It has the kind of strong, fluid and also gas. Biomass power is called a renewable energy.



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



Biomass power has the following benefits

Low cost, broad distribution, huge quantity, renewability, storable, easy to use.



Biomass energy also has some disadvantages:

Low power thickness, not ideal for long-distance transport. To ensure the biomass gas supply, it needs huge area for storage, which brings monitoring problem.

Crop straw has large circulation, yet it is affected by areas, seasons, weather conditions and various other factors. The supply is not steady. Besides, the calorific worth varies a great deal. Some are not suitable for boilers.

Different sort of biomass gas have various combustion impacts, which might cause slagging and leaves too much ash. The alkaline material in the ash will impede the continual job of biomass boiler and also trigger corrosion.

Biomass fuels are easy to obtain damp. The wetness material have excellent effect on the burning temperature level. Over-high moisture material will make the biomass gas not able to shed.



Affordable impact

Tools cost

Take a 4t/h heavy steam boiler as an example. The data processor of a DZL horizontal biomass central heating boiler costs around ￥ 180,000, the cost of complementary equipment and setup is around ￥ 65,000, so the total equipment cost is ￥ 245,000.



A WNS series gas boiler expenses around ￥ 150,000, the cost of complementary machinery and also installment is ￥ 55,000, so the overall equipment price is ￥ 205,000. For that reason, the devices price of biomass central heating boiler is greater than that of gas boiler



biomass gas boilernatural gas boiler.

Annual operating expense

We still take a 4t/h vapor boiler as an example, and also contrast the yearly procedure cost of biomass fuels and natural gas central heating boilers. The operation expense of a boiler consists of gas expense, power usage, labor cost and maintenance cost



Yearly gas cost.

As an example:

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

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

The cost of wood pellets is ￥ 1250/t.

A biomass central heating boiler consume 717kg timber pellet per hour.

The central heating boiler runs for 10 hrs everyday.

The yearly running time is 300days.

By calculation, the yearly gas expense is ￥ 2,688,800.



Yearly electric cost.

For instance:.

The overall power of a force and generate draft fun is 29.5 kw.

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

After that the total power of the biomass central heating boiler is 39.5 kw.

The electrical energy cost is ￥ 1.0/ kwh,.

The daily running time is 10 hrs.

The annual running days are 300 days.

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



Annual labor price.

For instance:.

The work has 2 changes a day.

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

The income is ￥ 3000 per person.

The labor cost is 144,000 each year.



Annual upkeep expense.

Biomass central heating boiler typically has numerous supporting machinery. Their failure price is higher than gas boiler. The yearly maintenance cost remains in proportion to the devices cost. If the maintenance expense is 2.5% of the equipment cost, after that it is ￥ 6100 annually.



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



Gas central heating boiler.

Annual gas price.

As an example.

The heat effectiveness of biomass boiler is 90%.

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

The price of natural gas is ￥ 3.1/ m3.

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

A gas central heating boiler operates 10 hours daily, 300 days each year.

By calculation, the yearly gas expense is ￥ 2,929,500.



Yearly electrical charge.

The power of the burner is 7.5 kw.

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

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

The power cost is ￥ 1.0/ kwh.

The functioning time is 10 hrs everyday, 300 days every year.

So the yearly power cost is ￥ 43500.



Yearly labor price.

The job has 2 shifts a day.

As the gas central heating boiler has higher automation, and the procedure is straightforward, it calls for just 1 firefighter.

The income is ￥ 3000 per month, so the annual labor price is ￥ 72000.



Yearly maintenance expense.

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


Expect the upkeep expense is 1% of the equipment expense, then it is ￥ 2100 annually.

By estimation, the yearly running price of a biomass boiler is ￥ 3,047,100.



Verdict.

In regards to the tools expense, biomass central heating boiler is more than natural gas boiler. In terms of the annual running expense, as gas central heating boiler has higher automation level, needs less power intake device, and also much less maintenance, the electrical charge, labor price and also upkeep expense is lower than that of biomass central heating boiler. However taking into consideration the high price of natural gas, the complete operation cost of gas central heating boiler is more than that of biomass central heating boiler.



Environmental impact.

Biomass gas.

Scientist determined the discharge of smoke, SO2 and NOx in 2 biomass boiler.



These 2 boilers has comparable dissipation capacity. Both of them are not furnished with sulfur and also nitrate getting rid of tool. However the first one is geared up with a bag-type dust collector, and also the 2nd one is outfitted with a film-type dirt collection agency.



The central heating boiler outfitted with film-type dust enthusiast can reduce the ash discharge efficiently. In regards to SO2 exhaust, the timber pellets can satisfy the specified requirement also without sulfur getting rid of tool. When it comes to NOx discharge, the wood pellets can meet the standard in boilers geared up with film-type dirt collection agency.



Gas.

Natural gas is an excellent quality and tidy gas fuel. The adoption of gas in the boiler can decrease the air contamination extremely. rdf pellet mill , sulfur as well as nitrogen content in the natural gas is reduced. The smoke of natural gas contains little SOx, which a satisfy specified standard. However the NOx exhaust is still a problem. Looked into located the NOx discharge of natural gas central heating boiler is 125mg/m3, and 25% of them is greater than 150mg/m3.



Conclusion.

According to the evaluation above, the type of biomass fuel has great impact on the contaminant exhaust. Timber pellets has less SO2 exhaust than straw pellets. The biomass central heating boiler with film-type dust collector has better ash getting rid of effect than bag-type dust collection agency.



The NOx exhaust is beyond requirement in biomass central heating boilers without sulfur or nitrate getting rid of gadget, whatever timber pellets or straw pellets. As a result, it is recommend to furnish reliable dirt collection agency, and also sulfur and nitrate getting rid of tool.



Gas has advantages in cutting smoke and also SO2 discharge. But with the increasing discharge criterion, even more natural gas boilers will take on low-nitrogen burning technology as well as nitrate eliminating gadget.



The particular benefits of natural gas and also biomass gas.

The rate of biomass boiler is greater than natural gas. Their operating cost is similar taking into consideration the rise of natural gas rate. Besides, the natural gas central heating boiler is much easier to control, as well as it doesn't take much floor space or gas storage room.



The cost of natural gas is under federal government control, so it will not vary greatly. The natural gas supply can be assured when the gas boiler is in usage. yulong pellet mill is restricted by seasons. The rate and supply is unstable, which generally takes up large storehouse area.



In regards to environmental protection, biomass boilers need to be furnished with dirt enthusiast, sulfur and also nitrate eliminating tool to make certain the smoke, SO2 and NOx exhaust satisfy the requirement. But gas central heating boilers does not require dirt enthusiast or desulfurizer, yet it require to take on low-nitrogen combustion technology or nitrate getting rid of gadget to reduce the NOx emission. Besides, the natural gas boiler doesn't require dust cleansing process.



Beyond, biomass gas is renewable. It is solar energy deposited in plants by photosynthesis. As stats reveal, the biomass energy generated by photosynthesis is 173 billion load, yet only 3% of them are used. Besides, water ring pelletizer is carbon neutral, which means the CO2 usage in its development equates to the exhaust in biomass gas burning.



Fluidized-bed burning is a technology based upon gas-solid fluidized state. It has great flexibility to biomass fuels, the toxin gas discharge is reduced. By adding desulfurizer to the fluidized bed, it can get rid of the sulfur straight, as well as minimize the SO2 content in the smoke greatly.



Nowadays, the fluidized bed can be made use of for the combustion of different kinds of gas, appropriate for the co-firing of biomass and also coals. The sort of fuels and their proportion is flexible, so you can pick them according the rate to lower your cost.



The high cost of gas is a problem. And the rate variation in between summer as well as winter is buckling down. Biomass is an outstanding substitute for traditional gas. To meet the ecological need and also accomplish greater affordable advantages, it is essential to boost the application technology of biomass fuel, as well as raise the proportion of biomass in energy mix.


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