waste

The new technology to help achieve optimization biogas plant

effectiveBiogas process optimizationRequirements of key parameters in situ monitoring: methane, carbon dioxide, and humidity.In the past, this cannot be achieved through the existing monitoring technology,Visa MGP261Create opportunities for the waste: to improve the profitability of biogas plant, help reduce the amount of waste, to reduce greenhouse gas emissions, as well as with the nutrient recycling agriculture.

Governments around the world are seeking to reduce greenhouse gas (GHG) emissions, in order to cope with climate change, reduce waste landfill, and improve the utilization of renewable energy according to the international agreement.In many countries/regions, therefore, provide subsidies to encourage the development of gas fields.

According to the international renewable energy agency (IRENA), a third of the global electricity capacity now based on renewable energy, and of all new power in 2018, almost two-thirds come from renewable resources.Most of the recent growth is provided by the solar and wind power, but in the past 10 years, the global biomass power is about three times as much as before.

Compared with the wind and solar energy, and agricultural products to generate biogas generated from the wet rot waste of renewable energy is the source of more reliable and more predictable.But, as the wind and solar energy technology becomes more efficient and biogas subsidies to reduce methane gas field had to focus on process optimization, in order to maintain profitability and competitive with other forms of energy production and in the long run can be maintained.

Waste waste?

Waste management has brought great challenges to the society, is increasingly seen as resources and waste.Organic waste due to its ability to generate methane, a powerful greenhouse gas) and particular attention.From organic waste anaerobic fermentation (AD) of gas can be used as contains and the use of renewable energy sources.These gases burn to generate renewable energy, or in the cogeneration (CHP) engine, to power generation and heat at the same time.Biogas can also upgrade to the biological methane (> 99%) is methane to compression and injection gas network, or used as transportation fuel.AD plant operators can also pass will be exported to the electricity grid, to the local business community sales heat or biogas, as well as the waste collection JinMenFei, into the factory to obtain income.Such plants produce renewal has rich nutrients, can be used as a fertilizer and soil amendment.

Whatever the process, the factory need to optimize the biogas production process, at the same time try to reduce cost and waste and downtime.However, biogas is a kind of corrosive and explosive gas, therefore, in the past, it is difficult to perform on-line monitoring.So far, the solution is to extract the sample to outside of the process are analyzed.

In order to realize efficient process optimization, visa MGP261 is developed, and it is the triad methane monitoring instrument, used to measure the methane, carbon dioxide and moisture at the same time.It is important that the instrument after the risk industry explosion-proof certification, can be used to partition 0/1, this support in the presence of explosive gas environment of pipe and pipe (pipe in the surrounding area level of partition 1) online installation.

Anaerobic digestion process

Within the pool will be the four main processes in order to generate biogas.These processes are contributed to by different groups of bacteria, and efficient process optimization is a key feature of a balance of the health of these microorganisms.The four main process is:

hydrolysis- complex organic substances (such as proteins, carbohydrates and fats) by bacteria enzyme decomposition into sugar, fatty acids and amino acids.
acidification- different fermentation reaction will be larger molecules into organic acids,
Alcohol, ammonia, carbon dioxide, hydrogen and hydrogen sulphide.
Acetic acid,- oxidation into simpler forms fermentation products, such as acetate and carbon dioxide.
methanationArchaea (single-celled organisms) acetic acid and hydrogen can be converted to methane and carbon dioxide.

After the interference of the two process will be led to a decline in biogas production, and can through methane: ratio of carbon dioxide to detect the change.Therefore, the need for continuous monitoring.

Process monitoring in order to improve efficiency

Biogas is usually in the 50% to 75% methane, the main components of the residual carbon dioxide and water vapor, and a small amount of other gases, such as the above mentioned gases.It is obvious that by monitoring methane, can measure the success of the plant operation;And by monitoring methane, carbon dioxide ratio, can to plant operators provide continuous real-time pool behavior index, as well as the status of microbes in the biogas.

Can through a variety of ways to use the relevant data of methane and carbon dioxide.First of all, the operator can use this information to adjust the load rate and waste source types, if possible, to improve state of bacteria.Second, when one is using biogas engine, you can use the measure to optimize the engine performance.Third, if is to refine biogas to inject gas network, you can use these data to inform biological methane upgrade process.

Of course, can also be extracted from the reactants sample for subsequent laboratory analysis.Which can provide process condition of accurate indicator, but the delay means that, as a result of subsequent analysis cannot be instant or automatic response, in order to optimize the process.Therefore, biogas methane and carbon dioxide on-line monitoring helps to reduce the need of costly laboratory analysis.

Why monitoring gas humidity?

The humidity in the biogas represents a potential problem for a variety of reasons.The humidity in the gas may occur due to the change of pressure or temperature condensation - for example, in the pressure regulator or pipes.Such condensation may cause serious damage, must be avoided.Similarly, biogas in excess moisture transmission to the CHP will increase the humidity in the engine oil in the engine, resulting in need more frequent replacement of engine oil.Obviously, due to engine service maintenance or repair of engine downtime should be shortened as far as possible, because this can lead to dissatisfaction with the user, but also may result in lost revenue every day from 3000 to 5000 euros.

Humidity should be taken seriously in the operation of the activated carbon filter, because the humidity of activated carbon filter is designed to in particular within the scope of work.Carbon filter is common, because the methane of impurities (such as hydrogen sulfide, a variety of organic siloxane and other gases) will need to be removed, in order to prevent damage to the engine, or generate enough purity so that suitable for biological methane gas to the pipeline (G2G) applications.Humidity may cause carbon filter premature wear and tear, resulting in costly repair needs.Some factories need to replace carbon filter several times a year, which may lead to spending more than 10000 euros a year.But the humidity is too low for some filters may also be a problem, because this may lead to insufficient carbon filter operation.

Why the in situ measurement?

In the past, the only option is to use the biogas analyzer, samples to through electrochemical or fixed wavelength infrared instrument for subsequent measurements.These technologies require frequent calibration again, so the cost is high, the human cost, the ability to continuously monitoring and may damage the plant.Also need to pump and gas pipelines, and need to dry samples, in order to prevent the error due to condensation and potential damage.Therefore, the humidity meter cannot measure sample.This also means that measurement results got from extraction instrument is based on dry.By definition, these readings will be higher than on the basis of moisture readings were obtained through the in situ measurement, although both wet and dry, visa MGP261 can provide measurement.

Samples in cold climate and frozen samples of pipeline risk, this will stop the flow and lead to wrong data.Can pass through the industrial explosion protection dangerous trace heating pipeline to correct the problem, but doing so costly, so it is difficult to implement.

Electrochemical can be extracted and fixed wavelength infrared gas analyzer has a relatively short working life, it is very important when considering the total cost of ownership.In addition, the technology has a shorter calibration interval, and requires frequent sampling system maintenance, so the cost may be higher.

Visa MGP261 pull overcomes the drawback of early extraction technology.

Visa technology

As the triad biogas analyzer, MGP261 relies on CARBOCAP ® technology, this technology has been used in many other industrial sectors for many years.Its characteristic is that the meter will be used to measure methane, carbon dioxide and the humidity of the second generation CARBOCAP ® technology integrated into a compact probe, the probe after industrial explosion-proof dangerous certification, can be directly in the corrosion resistance of explosive gas flow operation.MGP261 also have fast startup time (less than 2 minutes), suitable for after industrial used in the measuring instrument of explosion-proof dangerous authentication.

Visa pull CARBOCAP ® sensor has the electronic tuning method in - perot interferometer (FPI) filter.In addition to measuring target species, the micro mechanical FPI filter can also execute the reference measurement in not happen absorption wavelength.When performing reference measurement, the FPI filter for electric adjustment, so that the switch from absorption wavelength band pass band to the absorption wavelength.The reference measurement compensation of any possible changes in the intensity of light source and optical path of pollution, which means that the sensor with the passage of time is also highly reliable.

Visa by micro glow infrared light source, the user can from the low power, high stability and benefit for up to 15 years of service life.Within the MGP261, the same filter is used to measure the humidity and carbon dioxide, and the second light channel is used to measure the methane.In many ways, this will be the laboratory analysis of spectrometer function and industrial process control instrument is simple, rugged design combined.

From a user's point of view, the main advantages of this technology, including in situ measurement, it is the direct monitoring of process conditions, without the costs associated with other methods, problems and delays.Long-term stability to achieve less maintenance - need to be replaced when the probe filters become dirty, replace the often during engine maintenance.In addition, the self calibration function of the instrument would reduce operating costs, because without technical personnel frequent for service or calibration.And by reliable humidity control reduces the CHP engine maintenance and downtime, thus greatly save the money.

Where is the monitoring?

The application of this technique include monitoring of the anaerobic fermentation and landfill gas, methane gas treatment technology in the process of activated carbon filter and CHP engine feed gas monitoring.

In biogas plant, methane, carbon dioxide, and the typical humidity monitoring should be inside the pool or behind, so that by monitoring the CH4, CO2 ratio and the corresponding adjustment waste, loading rate, to optimize the digestive process, after or in the heat exchanger, in order to measure the humidity to optimize the drying process.Other possible monitoring can be in front of the activated carbon filter, the humidity measurement in order to optimize filtering;Here, in front of the CHP engine measuring humidity can realize the engine protection, and methane monitoring helps to optimize the engine performance, or in front of the methane upgrading device, in order to optimize process.

Global population growth and the associated waste management problems, at the same time also need to reduce greenhouse gas emissions, which are the main challenges facing the world today.Biogas industry is one of the most important aspects of the solution.But the biogas production is an organic process, affected by many variables as.Visa pull MGP261 able to perform accurate and reliable on-line monitoring, can reduce operating costs and by optimizing the production process to improve the efficiency of biogas plant, leading to higher value from waste.