Notes

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

In the last few years, the application of biomass fuel is increasing. In several locations, there arise competitors between biomass gas and also natural gas. In this flow, I will certainly take boiler burning for instance, as well as compare the tools price, procedure price and atmosphere impact of biomass boiler as well as natural gas central heating boiler.



This blog compares the economic and also environmental effect of biomass fuel and also natural gas. The devices expense of biomass boiler is greater than that of natural gas boiler. Considering the high cost of natural gas, the yearly operating cost (consisting of the expense of gas, electricity, labors and maintenance) of natural gas is greater than biomass boiler.



When utilizing biomass gas, it calls for to be furnished with dirt collector, sulfur and also nitrate removing tool to guarantee the contaminant discharge meet the standard. As for natural gas central heating boiler, it takes on low-nitrogen combustion innovation or denitrification device to guarantee the NOx emission satisfy the requirement.




Evaluation of biomass energy

Biomass power is solar energy deposited in biomass products in the form of chemical energy. It originates from the photosynthesis of green plants. It has the kind of solid, liquid and gas. Biomass power is called a renewable resource.



According to the various resources, the biomass fuels can be classified right into 6 kinds: plant straw, forestry waste, pet dung, marine plants, energy plants, life waste.



Biomass power has the adhering to benefits

Low cost, broad circulation, big volume, renewability, storable, easy to use.



Biomass energy also has some negative aspects:

Reduced power thickness, not appropriate for long-distance transport. To make sure the biomass fuel supply, it requires huge space for storage space, which brings administration issue.

Crop straw has wide circulation, yet it is affected by regions, periods, climates and various other variables. The supply is not stable. Besides, the calorific worth differs a whole lot. Some are not ideal for boilers.

Various kinds of biomass fuels have different combustion impacts, which might create slagging as well as leaves excessive ash. The alkaline web content in the ash will certainly hinder the continual job of biomass boiler and create deterioration.

Biomass fuels are simple to obtain damp. The dampness content have wonderful effect on the burning temperature. Over-high dampness web content will make the biomass fuel not able to shed.



Economical impact

Devices price

Take a 4t/h heavy steam central heating boiler for instance. The data processor of a DZL horizontal biomass boiler prices around ￥ 180,000, the price of auxiliary equipment and also installation is around ￥ 65,000, so the complete tools expense is ￥ 245,000.



A WNS series gas boiler prices around ￥ 150,000, the expense of supporting equipment as well as setup is ￥ 55,000, so the total devices expense is ￥ 205,000. As a result, the tools price of biomass central heating boiler is more than that of natural gas boiler



biomass fuel boilernatural gas boiler.

Yearly operating expense

We still take a 4t/h heavy steam central heating boiler for example, and also compare the annual procedure cost of biomass fuels and also gas boilers. The operation cost of a central heating boiler consists of fuels cost, electrical power intake, labor expense and maintenance expense



Annual gas price.

For instance:

The warm performance of a biomass central heating boiler is 80%.

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

The price of wood pellets is ￥ 1250/t.

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

The boiler runs for 10 hrs day-to-day.

The yearly running time is 300days.

By computation, the yearly gas cost is ￥ 2,688,800.



Annual electric fee.

As an example:.

The complete power of a force as well as generate draft enjoyable is 29.5 kw.

The total 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 power price is ￥ 1.0/ kwh,.

The everyday running time is 10 hours.


The annual operating days are 300 days.

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



Yearly labor cost.

For example:.

The work has two shifts a day.

Each shifts need 2 person. A fireman and also a water driver.

The wage is ￥ 3000 each.

The labor price is 144,000 per year.



Annual upkeep expense.

Biomass boiler typically has many supporting equipment. Their failing price is greater than gas boiler. The yearly maintenance price remains in proportion to the devices price. If the maintenance cost is 2.5% of the tools cost, after that it is ￥ 6100 every year.



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



Gas central heating boiler.

Yearly gas cost.

For example.

The warmth effectiveness of biomass boiler is 90%.

The calorific worth of 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 operates 10 hrs day-to-day, 300 days each year.

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



Annual electric fee.

The power of the burner is 7.5 kw.

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

So the overall electric power of the biomass boiler is 14.5 kw.

The electrical energy cost is ￥ 1.0/ kwh.

The working time is 10 hours everyday, 300 days annually.

So the yearly electrical power price is ￥ 43500.



Yearly labor price.

The work has 2 changes a day.

As the gas boiler has higher automation, and also the operation is basic, it calls for only 1 firefighter.

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



Annual maintenance expense.

The upkeep work of a gas boiler is not much, the cost is low.

Mean the upkeep cost is 1% of the devices expense, after that it is ￥ 2100 annually.

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



Conclusion.

In terms of the equipment price, biomass central heating boiler is higher than natural gas central heating boiler. In regards to the annual running cost, as natural gas central heating boiler has higher automation degree, requires less power intake gadget, as well as much less maintenance, the electrical cost, labor cost and upkeep expense is less than that of biomass central heating boiler. But thinking about the high price of gas, the total operation cost of natural gas boiler is higher than that of biomass boiler.



Ecological impact.

Biomass fuel.

Researchers measured the exhaust of smoke, SO2 as well as NOx in 2 biomass boiler.



These 2 central heating boilers has comparable dissipation capability. Both of them are not geared up with sulfur and nitrate getting rid of tool. But the initial one is geared up with a bag-type dust collector, and also the 2nd one is furnished with a film-type dust collector.



The central heating boiler outfitted with film-type dust collector can reduce the ash discharge efficiently. In regards to SO2 emission, the wood pellets can fulfill the stated criterion even without sulfur removing gadget. As for NOx exhaust, the timber pellets can satisfy the criterion in boilers outfitted with film-type dirt enthusiast.



Natural gas.

Gas is a high quality and also tidy gas fuel. The fostering of natural gas in the central heating boiler can minimize the air contamination incredibly. The ash, sulfur and also nitrogen web content in the gas is reduced. The smoke of natural gas consists of little SOx, which a fulfill stated requirement. But the NOx exhaust is still a trouble. Investigated discovered the NOx exhaust of natural gas central heating boiler is 125mg/m3, as well as 25% of them is more than 150mg/m3.



Verdict.

According to the evaluation over, the type of biomass fuel has wonderful influence on the toxin exhaust. Wood pellets has much less SO2 discharge than straw pellets. The biomass boiler with film-type dirt collection agency has much better ash eliminating effect than bag-type dirt collection agency.



The NOx exhaust is beyond requirement in biomass central heating boilers without sulfur or nitrate getting rid of tool, whatever wood pellets or straw pellets. Consequently, it is suggest to gear up reliable dust collector, and sulfur and nitrate getting rid of gadget.



Natural gas has advantages in reducing smoke and also SO2 emission. Yet with the increasing discharge criterion, more gas central heating boilers will take on low-nitrogen burning modern technology as well as nitrate removing gadget.



The respective advantages of natural gas as well as biomass fuel.

The rate of biomass central heating boiler is higher than gas. Their operating expense is similar taking into consideration the surge of natural gas price. Besides, used wood pellet mill for sale is simpler to control, and it does not take much flooring area or fuel storage room.



The cost of natural gas is under government control, so it won't fluctuate sharply. The gas supply can be assured when the gas boiler remains in usage. Biomass pellets supply is limited by periods. small pellet mill price and supply is unsteady, which generally occupies big stockroom room.



In terms of environmental protection, biomass boilers have to be geared up with dirt enthusiast, sulfur as well as nitrate removing device to guarantee the smoke, SO2 and also NOx discharge meet the requirement. Yet gas boilers doesn't require dirt collection agency or desulfurizer, but it need to embrace low-nitrogen burning technology or nitrate eliminating device to cut the NOx emission. Besides, the natural gas central heating boiler doesn't require dust cleaning process.



Beyond, biomass fuel is renewable. It is solar energy transferred in plants by photosynthesis. As data reveal, the biomass power created by photosynthesis is 173 billion heap, however only 3% of them are made use of. Besides, biomass energy is carbon neutral, which suggests the CO2 consumption in its growth amounts to the discharge in biomass gas burning.



Fluidized-bed combustion is a technology based on gas-solid fluidized state. It has good flexibility to biomass gas, the toxin gas emission is reduced. By including desulfurizer to the fluidized bed, it can eliminate the sulfur directly, and also minimize the SO2 content in the smoke sharply.



Nowadays, the fluidized bed can be made use of for the combustion of different sort of gas, suitable for the co-firing of biomass as well as coals. The type of gas and also their percentage is adjustable, so you can choose them according the cost to lower your price.



The high cost of gas is a problem. And the price variation in between summertime and winter months is getting serious. Biomass is an exceptional substitute for standard fuels. To satisfy the ecological demand and also attain greater cost-effective benefits, it is important to enhance the application modern technology of biomass fuel, and also boost the percentage of biomass in power mix.


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