Notes

Why is biomass a better choice to natural gas?<br>
Competition in between biomass gas and gas

In the last few years, the application of biomass fuel is raising. In many places, there arise competitors between biomass fuels and also natural gas. In this flow, I will take central heating boiler burning as an example, and also contrast the equipment cost, procedure expense and also environment impact of biomass boiler and gas boiler.



This blog site contrasts the economic as well as ecological effect of biomass fuel as well as natural gas. The equipment expense of biomass central heating boiler is greater than that of gas central heating boiler. Thinking about the high rate of natural gas, the annual operating expense (consisting of the price of fuel, electrical power, labors and upkeep) of gas is greater than biomass central heating boiler.



When using biomass gas, it requires to be equipped with dust collection agency, sulfur and also nitrate getting rid of tool to guarantee the contaminant discharge satisfy the requirement. When it comes to natural gas central heating boiler, it takes on low-nitrogen combustion innovation or denitrification gadget to make certain the NOx emission satisfy the standard.



Analysis of biomass power

Biomass energy is solar power deposited in biomass products in the form of chemical power. It originates from the photosynthesis of eco-friendly plants. It has the type of strong, liquid and gas. Biomass energy is known as a renewable resource.



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



Biomass energy has the following advantages

Affordable, wide distribution, large volume, renewability, storable, easy to use.



Biomass power likewise has some downsides:

Low power thickness, not ideal for long-distance transport. To make certain the biomass gas supply, it needs huge room for storage space, which brings management issue.

Plant straw has wide distribution, however it is influenced by regions, seasons, weather conditions and also various other aspects. The supply is not stable. Besides, the calorific value differs a great deal. Some are not ideal for boilers.

Different type of biomass gas have different burning results, which may create slagging and leaves excessive ash. The alkaline content in the ash will hinder the constant work of biomass boiler and cause deterioration.

Biomass gas are very easy to get damp. The wetness web content have wonderful impact on the combustion temperature level. Over-high moisture web content will certainly make the biomass fuel not able to shed.



Cost-effective result

Equipment cost

Take a 4t/h vapor boiler for example. The data processor of a DZL straight biomass central heating boiler expenses around ￥ 180,000, the expense of supporting equipment and installment is around ￥ 65,000, so the overall devices expense is ￥ 245,000.



A WNS series natural gas boiler costs around ￥ 150,000, the expense of supporting equipment and installment is ￥ 55,000, so the total tools cost is ￥ 205,000. Therefore, the tools price of biomass central heating boiler is more than that of natural gas central heating boiler



biomass gas boilernatural gas central heating boiler.

Annual operating expense

We still take a 4t/h steam central heating boiler as an example, as well as contrast the yearly operation price of biomass gas and gas boilers. The procedure expense of a boiler includes gas expense, electricity consumption, labor cost as well as maintenance cost



Yearly fuel price.

As an example:

The warm 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 hour.

The central heating boiler runs for 10 hours day-to-day.

The annual running time is 300days.

By calculation, the annual gas cost is ￥ 2,688,800.



Annual electrical charge.

For instance:.

The complete power of a pressure as well as induce draft fun is 29.5 kw.

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

Then the total power of the biomass boiler is 39.5 kw.

The electricity rate is ￥ 1.0/ kwh,.

The daily running time is 10 hours.

The annual running days are 300 days.

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



Annual labor expense.

For instance:.

The work has 2 shifts a day.

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

The income is ￥ 3000 per person.

The labor expense is 144,000 per year.



Yearly maintenance price.

Biomass central heating boiler typically has many complementary machinery. Their failure price is higher than gas boiler. The annual maintenance cost is in proportion to the tools price. If the maintenance cost is 2.5% of the equipment price, after that it is ￥ 6100 annually.



By calculation, the annual running cost of biomass boiler is ￥ 2,957,400.



Gas central heating boiler.

Yearly gas cost.

For instance.

The warm performance 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 boiler can consume 315m3 natural gas every hr.

A gas central heating boiler operates 10 hrs daily, 300 days every year.

By computation, 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 other power usage 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 functioning time is 10 hrs each day, 300 days each year.

So the annual electrical energy cost is ￥ 43500.



Annual labor cost.

The job has 2 changes a day.

As the gas central heating boiler has higher automation, as well as the operation is straightforward, it calls for only 1 firefighter.

The wage is ￥ 3000 monthly, so the yearly labor expense is ￥ 72000.



Yearly upkeep cost.

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

Mean the upkeep price is 1% of the tools expense, after that it is ￥ 2100 yearly.

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



Final thought.

In terms of the devices price, biomass boiler is greater than gas boiler. In terms of the yearly running cost, as gas boiler has greater automation degree, needs much less power consumption tool, and less maintenance, the electrical cost, labor cost and also upkeep price is less than that of biomass boiler. Yet thinking about the high price of natural gas, the overall procedure price of gas boiler is more than that of biomass boiler.



Ecological effect.


Biomass fuel.

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



These 2 boilers has comparable evaporation capacity. Both of them are not equipped with sulfur as well as nitrate removing tool. But the initial one is furnished with a bag-type dirt enthusiast, as well as the 2nd one is outfitted with a film-type dust enthusiast.



The central heating boiler equipped with film-type dust collection agency can minimize the ash emission effectively. In regards to SO2 exhaust, the wood pellets can meet the specified criterion also without sulfur removing tool. As for NOx exhaust, the timber pellets can satisfy the requirement in central heating boilers furnished with film-type dust collection agency.



Gas.

Natural gas is a high quality and clean gas fuel. The fostering of gas in the central heating boiler can lower the air contamination extremely. The ash, sulfur and nitrogen content in the gas is low. The smoke of gas includes little SOx, which a fulfill specified standard. However the NOx emission is still an issue. Investigated located the NOx discharge of natural gas central heating boiler is 125mg/m3, as well as 25% of them is greater than 150mg/m3.



Verdict.


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



The NOx emission is past requirement in biomass boilers without sulfur or nitrate getting rid of device, whatever timber pellets or straw pellets. Consequently, it is suggest to furnish effective dust enthusiast, and sulfur and also nitrate removing gadget.



Gas has advantages in reducing smoke and SO2 exhaust. However with pe pelletizing machine raising emission standard, even more gas boilers will certainly take on low-nitrogen combustion technology as well as nitrate getting rid of tool.



The respective advantages of gas and biomass gas.

The cost of biomass boiler is higher than natural gas. Their operating cost is comparable thinking about the increase of natural gas price. Besides, the gas central heating boiler is much easier to control, and also it does not take much floor space or fuel storage room.



The price of gas is under government control, so it will not change sharply. The gas supply can be assured when the gas central heating boiler is in usage. Biomass pellets supply is limited by seasons. The cost and also supply is unsteady, which normally occupies big storage facility room.



In terms of environmental protection, biomass boilers need to be equipped with dirt collection agency, sulfur as well as nitrate removing gadget to guarantee the smoke, SO2 as well as NOx discharge satisfy the standard. However gas central heating boilers does not need dust collection agency or desulfurizer, however it require to adopt low-nitrogen burning modern technology or nitrate eliminating device to cut the NOx discharge. Besides, the natural gas boiler does not need dirt cleansing procedure.



Beyond, biomass gas is eco-friendly. It is solar power transferred in plants by photosynthesis. As data show, the biomass power created by photosynthesis is 173 billion ton, yet just 3% of them are made use of. Besides, biomass power is carbon neutral, which means the CO2 usage in its growth equals the emission in biomass fuel burning.



Fluidized-bed combustion is a technology based on gas-solid fluidized state. It has excellent adaptability to biomass fuels, the contaminant gas discharge is reduced. By including desulfurizer to the fluidized bed, it can eliminate the sulfur directly, and also reduce the SO2 material in the smoke greatly.



Nowadays, the fluidized bed can be utilized for the burning of various sort of fuels, suitable for the co-firing of biomass as well as coals. The type of fuels and also their proportion is flexible, so you can pick them according the rate to decrease your cost.



The high cost of gas is a problem. And the price variation between summertime as well as winter months is getting serious. Biomass is an excellent substitute for conventional gas. To satisfy the environmental need as well as attain greater cost-effective benefits, it is important to improve the application innovation of biomass fuel, as well as increase the percentage of biomass in energy mix.


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