Biomass gasification fuel gas
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During biomass gasification, if too much air is used, high levels of carbon dioxide are produced, making it difficult to ignite the gas； When the amount of air is low, it is also difficult to ignite – what is the reason for this?
Nitrogen levels must also be over 60% in order to be able to ignite
To ensure good combustion, oxygen-enriched combustion can be used to reduce nitrogen
The effective products of biomass gasification are mainly combustible gases such as carbon monoxide. 1. A large volume of ventilation generates excessive carbon dioxide, which is not flammable ； 2. Insufficient ventilation causes a large amount of organic matter to carbonize, resulting in little available combustible material that is not easy to ignite.
There are still many people and companies working in this field, so more technical expertise should be accumulated.
Biomass gasification is primarily used to produce the combustible gas CO; oxygen-enriched combustion is employed, and it should be noted that using pure oxygen in the combustion zone certainly yields better results, but it also increases the cost of gas production. Most of the biomass gasifiers produced are intended for use by farmers, and it is clearly not advisable to use pure oxygen
There’s too much nitrogen! ! Reduce the amount of nitrogen
What the original poster might be referring to is a situation where air is used as a vaporizing agent, with some of the material burning while another part is vaporized; more air flow leads to more burning, and thus less combustible gas is produced； Less ventilation can also lead to less gas production due to insufficient heating. If water vapor is used as the vaporizing agent, this problem does not arise, but an external heat source must be considered, such as direct combustion of biomass to provide the necessary heat.
Biomass gasification also requires a certain amount of heat release to maintain the gasification temperature. If too little gasifying agent is used, the gasification temperature drops, the carbon conversion rate decreases, and accordingly the volume ratio of nitrogen increases, resulting in failure to ignite
The oxidation method has a low calorific value; it’s the dry distillation and pyrolysis methods that have a promising future!
11# vikeyzhao: Although the dry distillation and pyrolysis method has its advantages, the removal of tar remains a significant issue when it comes to gas collection. Most importantly, it requires high energy consumption; therefore, it is not suitable if the generated gas is intended for use in cooking by farmers.