Biomass conversion into biofuels and biogas is a promising way for power and heat generation. Lately, research has focused on the production of biomethane based on biomass gasification followed by methanation as an alternative to fossil natural gas. The challenge of this process remains in the intensive gas cleaning and required tar removal. In order to study tar removal from the producer gas downstream biomass gasification, solid–vapor and liquid–vapor equilibrium must be known for different tar concentrations, ranging between 0.001 and 100 g.Nm⁻³. To assess tar removal by condensation at low temperatures, psychrometric charts are developed. Since the composition of tar is complex, toluene, phenol, indene, naphthalene and fluoranthene are selected as tar representatives. Each component is studied separately in four different producer gas compositions formed mainly of hydrogen, carbon monoxide, carbon dioxide and methane in addition to water and nitrogen. Methods for calculating saturation, isenthalpic and constant relative concentration lines are presented. Psychrometric charts of the different tar components are finally plotted at atmospheric pressure. Results show that temperature of 196.15 K is required to reduce the tar content to 0.001 g.Nm⁻³.

将生物质转化为生物燃料和沼气是发电和供热的有前途的方式。最近，研究集中在基于生物质气化然后甲烷化作为化石天然气的替代品的生物甲烷的生产上。该过程的挑战仍然在于密集的气体清洁和所需的焦油去除。为了研究从生产气下游生物质气化中除去焦油，必须知道不同焦油浓度在0.001至100 g.Nm ^-3之间的固-汽和液-汽平衡。。为了评估在低温下冷凝产生的焦油去除量，开发了干湿图。由于焦油的成分复杂，因此选择甲苯，苯酚，茚，萘和荧蒽作为焦油的代表。在四种不同的生产气体成分中分别研究每种成分，除了天然气和水以外，还主要由氢气，一氧化碳，二氧化碳和甲烷组成。提出了计算饱和度，等焓线和恒定相对浓度线的方法。最后在大气压力下绘制不同焦油成分的干湿图。结果表明，将焦油含量降低至0.001 g.Nm ^-3需要196.15 K的温度。