Notes

Why is biomass a better choice to gas?<br>
Competition between biomass fuel as well as natural gas

In recent years, the application of biomass gas is raising. In numerous areas, there arise competitions between biomass fuels and natural gas. In this flow, I will take boiler burning for example, and also compare the devices cost, procedure cost and environment impact of biomass boiler as well as natural gas central heating boiler.



This blog contrasts the financial and also environmental impact of biomass fuel and natural gas. The devices expense of biomass boiler is higher than that of natural gas central heating boiler. Thinking about the high cost of gas, the yearly operating expense (consisting of the expense of gas, electricity, labors as well as upkeep) of natural gas is greater than biomass central heating boiler.



When using biomass gas, it calls for to be geared up with dust enthusiast, sulfur and also nitrate getting rid of tool to ensure the toxin discharge satisfy the requirement. As for gas boiler, it adopts low-nitrogen combustion innovation or denitrification gadget to ensure the NOx exhaust fulfill the criterion.



Analysis of biomass energy

Biomass power is solar power transferred in biomass products in the form of chemical energy. It comes from the photosynthesis of green plants. It has the type of solid, fluid and gas. Biomass energy is called a renewable energy.



According to the different sources, the biomass gas can be classified into 6 kinds: plant straw, forestry waste, animal dung, marine plants, energy plants, life rubbish.



Biomass energy has the following benefits

Inexpensive, vast distribution, huge volume, renewability, storable, easy to use.



Biomass power likewise has some downsides:

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

Crop straw has wide distribution, yet it is influenced by areas, seasons, weathers and other elements. The supply is not stable. Besides, the calorific worth differs a lot. Some are not suitable for central heating boilers.

Different kinds of biomass fuels have different combustion impacts, which may create slagging as well as leaves excessive ash. The alkaline content in the ash will certainly impede the continual work of biomass boiler and create deterioration.

Biomass gas are easy to get damp. The wetness material have terrific impact on the burning temperature. Over-high dampness content will make the biomass gas not able to shed.



Economical result

Equipment cost

Take a 4t/h vapor boiler as an example. The data processor of a DZL straight biomass central heating boiler costs around ￥ 180,000, the price of complementary machinery and also installment is around ￥ 65,000, so the overall tools price is ￥ 245,000.



A WNS series gas boiler costs around ￥ 150,000, the expense of auxiliary equipment and also installment is ￥ 55,000, so the overall equipment cost is ￥ 205,000. For that reason, the tools price of biomass boiler is higher than that of natural gas boiler



biomass fuel boilernatural gas central heating boiler.

Yearly operating expense

We still take a 4t/h heavy steam boiler as an example, and compare the yearly procedure expense of biomass gas and natural gas central heating boilers. The procedure cost of a boiler consists of fuels price, electricity consumption, labor price and also maintenance price



Yearly gas price.

For example:

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


The calorific worth of biomass gas is 17.58 MJ/kg a minimum of.

The price of wood pellets is ￥ 1250/t.

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

The central heating boiler competes 10 hrs daily.

The yearly running time is 300days.

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



Yearly electrical fee.

As an example:.

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

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

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

The electrical power rate is ￥ 1.0/ kwh,.

The everyday running time is 10 hours.

The yearly running days are 300 days.

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



Yearly labor expense.

For example:.

The job has 2 changes a day.


Each shifts need 2 individual. A firefighter as well as a water driver.

The salary is ￥ 3000 each.

The labor price is 144,000 per year.



Yearly upkeep cost.

Biomass boiler generally has numerous auxiliary machinery. Their failing rate is more than gas central heating boiler. The annual maintenance cost is in percentage to the equipment expense. If the upkeep expense is 2.5% of the tools cost, after that it is ￥ 6100 annually.



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



Gas boiler.

Yearly fuel expense.

For example.

The warm performance of biomass boiler is 90%.

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

The cost of gas is ￥ 3.1/ m3.

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

A gas central heating boiler operates 10 hrs everyday, 300 days each year.

By estimation, the yearly fuel price is ￥ 2,929,500.



Annual electrical charge.

The power of the burner is 7.5 kw.

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

So the complete electric power of the biomass central heating boiler is 14.5 kw.

The electrical energy price is ￥ 1.0/ kwh.

The working time is 10 hours each day, 300 days yearly.

So the annual power expense is ￥ 43500.



Yearly labor price.

The work has 2 changes a day.

As the gas central heating boiler has higher automation, and the procedure is basic, it needs just 1 fire fighter.

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



Annual maintenance price.

The upkeep work of a gas central heating boiler is very little, the cost is reduced.

Expect the maintenance expense is 1% of the equipment price, after that it is ￥ 2100 each year.

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



Conclusion.

In terms of the equipment expense, biomass boiler is more than natural gas central heating boiler. In regards to the annual running cost, as gas central heating boiler has higher automation level, requires much less power consumption gadget, and much less upkeep, the electric fee, labor expense as well as upkeep expense is less than that of biomass central heating boiler. Yet thinking about the high price of gas, the total procedure price of gas central heating boiler is more than that of biomass boiler.



Environmental result.

Biomass gas.

Researchers determined the exhaust of smoke, SO2 as well as NOx in 2 biomass central heating boiler.



These 2 boilers has comparable evaporation capability. Both of them are not outfitted with sulfur and also nitrate eliminating gadget. However the first one is geared up with a bag-type dust enthusiast, and also the second one is furnished with a film-type dirt enthusiast.



The boiler geared up with film-type dirt collection agency can minimize the ash exhaust efficiently. In regards to SO2 exhaust, the timber pellets can satisfy the stated requirement also without sulfur removing gadget. When it comes to NOx exhaust, the timber pellets can meet the criterion in boilers furnished with film-type dust enthusiast.



Natural gas.

Gas is a high quality and also clean gas fuel. The fostering of natural gas in the central heating boiler can minimize the air pollution extremely. The ash, sulfur as well as nitrogen web content in the gas is reduced. The smoke of natural gas includes little SOx, which a satisfy specified criterion. Yet the NOx emission is still a problem. Looked into found the NOx emission of gas central heating boiler is 125mg/m3, as well as 25% of them is greater than 150mg/m3.



Final thought.

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



The NOx discharge is beyond criterion in biomass central heating boilers without sulfur or nitrate removing gadget, whatever timber pellets or straw pellets. For that reason, it is recommend to equip reliable dirt collector, as well as sulfur and also nitrate eliminating device.



Gas has advantages in reducing smoke and also SO2 exhaust. However with Richi machinery raising discharge criterion, even more natural gas central heating boilers will embrace low-nitrogen burning innovation as well as nitrate eliminating gadget.



The corresponding benefits of natural gas and biomass fuel.

The price of biomass boiler is more than gas. sawdust pellet machine operating expense is comparable thinking about the surge of gas price. Besides, the gas boiler is simpler to control, and also it doesn't take much flooring space or fuel storage room.



The price of natural gas is under government control, so it won't vary dramatically. The gas supply can be assured when the gas boiler is in use. Biomass pellets supply is restricted by periods. The cost as well as supply is unsteady, which normally takes up huge warehouse room.



In terms of environmental protection, biomass central heating boilers need to be outfitted with dirt collector, sulfur as well as nitrate eliminating gadget to make certain the smoke, SO2 and also NOx discharge satisfy the standard. Yet natural gas boilers does not need dust collection agency or desulfurizer, yet it require to embrace low-nitrogen combustion technology or nitrate removing device to cut the NOx exhaust. Besides, the gas central heating boiler does not need dirt cleansing process.



Beyond, biomass fuel is sustainable. It is solar power deposited in plants by photosynthesis. As statistics show, the biomass energy produced by photosynthesis is 173 billion load, however just 3% of them are used. Besides, biomass power is carbon neutral, which means the carbon dioxide consumption in its development equates to the discharge in biomass fuel burning.



Fluidized-bed burning is a modern technology based on gas-solid fluidized state. It has excellent flexibility to biomass fuels, the contaminant gas exhaust is reduced. By including desulfurizer to the fluidized bed, it can remove 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 type of gas, appropriate for the co-firing of biomass and also coals. The kind of fuels and their percentage is adjustable, so you can pick them according the rate to reduce your price.



The high rate of natural gas is a problem. As well as the price disparity between summer season and also winter is getting serious. Biomass is an outstanding replacement for conventional gas. To satisfy the ecological need as well as attain greater cost-effective benefits, it is very important to boost the application technology of biomass fuel, and also boost the proportion of biomass in energy mix.


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