Notes

Why is biomass a far better choice to natural gas?<br>
Competitors in between biomass fuel and also natural gas

Over the last few years, the application of biomass fuel is increasing. In lots of areas, there occur competitors in between biomass gas and also natural gas. In manual fish feed making machine , I will certainly take boiler burning for example, and compare the equipment expense, procedure expense and also environment effect of biomass boiler and gas central heating boiler.



This blog compares the economic as well as ecological result of biomass fuel as well as gas. The equipment cost of biomass boiler is higher than that of gas boiler. Thinking about the high price of natural gas, the annual operating cost (consisting of the price of fuel, power, labors and upkeep) of gas is more than biomass central heating boiler.



When using biomass fuels, it calls for to be geared up with dirt collector, sulfur and nitrate eliminating gadget to guarantee the contaminant emission fulfill the requirement. When it comes to gas central heating boiler, it takes on low-nitrogen combustion modern technology or denitrification tool to make sure the NOx discharge satisfy the requirement.



Evaluation of biomass energy

Biomass energy is solar energy transferred in biomass materials in the form of chemical energy. It comes from the photosynthesis of eco-friendly plants. It has the type of solid, fluid and gas. Biomass power is referred to as a renewable resource.



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



Biomass power has the complying with benefits

Inexpensive, broad distribution, large quantity, renewability, storable, easy to use.



Biomass power additionally has some negative aspects:

Low power thickness, not suitable for long-distance transportation. To make sure the biomass gas supply, it needs huge space for storage space, which brings management problem.

Plant straw has large distribution, yet it is affected by regions, seasons, weathers and other aspects. The supply is not secure. Besides, the calorific worth differs a whole lot. Some are not appropriate for boilers.

Different kinds of biomass fuels have different combustion results, which may cause slagging and also leaves way too much ash. The alkaline content in the ash will impede the continual job of biomass boiler and create rust.

Biomass fuels are easy to obtain damp. The dampness material have fantastic effect on the combustion temperature level. Over-high moisture content will certainly make the biomass fuel unable to shed.



Economical impact

Tools price

Take a 4t/h heavy steam central heating boiler as an example. The mainframe of a DZL straight biomass boiler expenses around ￥ 180,000, the price of auxiliary machinery as well as installment is around ￥ 65,000, so the complete equipment price is ￥ 245,000.



A WNS series natural gas boiler prices around ￥ 150,000, the price of supporting machinery as well as setup is ￥ 55,000, so the complete devices cost is ￥ 205,000. For that reason, the tools price of biomass central heating boiler is greater than that of gas boiler



biomass fuel boilernatural gas central heating boiler.

Annual operating cost

We still take a 4t/h heavy steam central heating boiler for instance, and also compare the yearly operation price of biomass gas as well as natural gas central heating boilers. The procedure price of a boiler includes fuels cost, electrical power intake, labor expense and also maintenance expense



Yearly gas cost.

As an example:

The warm efficiency of a biomass boiler is 80%.

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

The price of wood pellets is ￥ 1250/t.

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

The boiler competes 10 hours everyday.

The yearly running time is 300days.

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



Annual electric fee.

As an example:.

The total power of a force and also induce draft fun is 29.5 kw.

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

After that the complete power of the biomass boiler is 39.5 kw.

The electricity price is ￥ 1.0/ kwh,.

The daily running time is 10 hours.

The annual operating days are 300 days.

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



Annual labor cost.

As an example:.

The job has two changes a day.

Each shifts need 2 person. A fire fighter and a water driver.

The income is ￥ 3000 each.

The labor price is 144,000 annually.



Yearly upkeep expense.

Biomass central heating boiler usually has several complementary machinery. Their failure price is greater than gas boiler. The yearly maintenance expense is in proportion to the equipment price. If the upkeep cost is 2.5% of the equipment price, then it is ￥ 6100 every year.



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



Natural gas central heating boiler.

Annual fuel expense.

For example.

The warm efficiency of biomass boiler is 90%.

The calorific value of gas is 35.58 MJ/kg.

The price of gas is ￥ 3.1/ m3.

A gas central heating boiler can eat 315m3 natural gas every hour.

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

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



Yearly electrical cost.

The power of the heater is 7.5 kw.

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

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

The electrical energy rate is ￥ 1.0/ kwh.

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


So the yearly power expense is ￥ 43500.



Annual labor cost.

The job has 2 shifts a day.

As the gas boiler has greater automation, and also the operation is simple, it needs only 1 firefighter.

The wage is ￥ 3000 monthly, so the annual labor price is ￥ 72000.



Yearly upkeep expense.

The upkeep work of a gas central heating boiler is not much, the expense is reduced.

Intend the upkeep expense is 1% of the tools expense, after that it is ￥ 2100 annually.


By calculation, the annual running cost of a biomass boiler is ￥ 3,047,100.



Conclusion.

In regards to the equipment price, biomass central heating boiler is greater than gas central heating boiler. In regards to the yearly running cost, as gas boiler has greater automation degree, calls for much less power intake tool, and also much less maintenance, the electric charge, labor price and also maintenance price is less than that of biomass central heating boiler. But considering the high price of natural gas, the total operation cost of gas central heating boiler is greater than that of biomass central heating boiler.



Environmental impact.

Biomass fuel.

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



These 2 central heating boilers has comparable evaporation capacity. Both of them are not geared up with sulfur as well as nitrate getting rid of gadget. However the first one is outfitted with a bag-type dust collection agency, and the second one is equipped with a film-type dust collector.



The boiler outfitted with film-type dirt collector can lower the ash emission properly. In terms of SO2 discharge, the timber pellets can meet the stipulated standard also without sulfur removing device. As for cattle feed pellet plant , the timber pellets can fulfill the criterion in boilers geared up with film-type dirt enthusiast.



Gas.

Natural gas is an excellent quality and also clean gas fuel. The fostering of gas in the central heating boiler can lower the air contamination remarkably. The ash, sulfur and also nitrogen material in the gas is low. The smoke of gas has little SOx, which a meet specified criterion. Yet the NOx discharge is still an issue. Investigated located the NOx emission of natural gas central heating boiler is 125mg/m3, and also 25% of them is greater than 150mg/m3.



Conclusion.

According to the evaluation over, the sort of biomass gas has fantastic influence on the toxin emission. Timber pellets has much less SO2 discharge than straw pellets. The biomass boiler with film-type dust collector has better ash removing effect than bag-type dust enthusiast.



The NOx exhaust is past criterion in biomass central heating boilers without sulfur or nitrate removing device, whatever timber pellets or straw pellets. Therefore, it is suggest to outfit efficient dirt collection agency, as well as sulfur and also nitrate getting rid of tool.



Natural gas has advantages in reducing smoke and also SO2 discharge. Yet with the enhancing emission standard, more natural gas boilers will certainly adopt low-nitrogen burning technology and also nitrate getting rid of tool.



The respective advantages of natural gas and also biomass gas.

The cost of biomass boiler is more than natural gas. Their operating expense is comparable thinking about the surge of natural gas rate. Besides, the gas central heating boiler is simpler to control, and also it doesn't take much floor area or gas storage room.



The cost of gas is under government control, so it will not vary dramatically. The gas supply can be assured when the gas central heating boiler remains in usage. Biomass pellets supply is limited by periods. The cost and also supply is unstable, which normally occupies huge warehouse room.



In terms of environmental management, biomass boilers have to be equipped with dust enthusiast, sulfur and nitrate removing gadget to guarantee the smoke, SO2 and NOx discharge fulfill the requirement. Yet natural gas central heating boilers does not require dirt collector or desulfurizer, but it require to adopt low-nitrogen combustion innovation or nitrate eliminating gadget to cut the NOx exhaust. Besides, the natural gas central heating boiler doesn't need dust cleaning process.



On the other side, biomass fuel is renewable. It is solar power transferred in plants by photosynthesis. As data reveal, the biomass energy produced by photosynthesis is 173 billion heap, however only 3% of them are made use of. Besides, biomass power is carbon neutral, which indicates the carbon dioxide usage in its growth equates to the emission in biomass fuel burning.



Fluidized-bed burning is a modern technology based upon gas-solid fluidized state. It has great versatility to biomass gas, the pollutant gas emission is reduced. By adding desulfurizer to the fluidized bed, it can eliminate the sulfur straight, and also lower the SO2 content in the smoke sharply.



Nowadays, the fluidized bed can be used for the combustion of different type of gas, ideal for the co-firing of biomass and coals. The type of fuels as well as their proportion is adjustable, so you can choose them according the cost to decrease your expense.



The high cost of gas is an issue. And the cost disparity in between summertime as well as winter season is getting serious. Biomass is an exceptional alternative to typical fuels. To satisfy the environmental need and attain higher economical advantages, it is necessary to improve the application technology of biomass fuel, and raise the percentage of biomass in energy mix.


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