A biomass gasifier is a device that converts biomass materials, such as wood chips, agricultural residues, or even municipal solid waste, into a combustible gas known as producer gas or syngas. This process is called biomass gasification. 

     The gasification process typically involves heating the biomass in a low-oxygen environment, which causes it to undergo pyrolysis and produce volatile gases. These gases are then reacted with a controlled amount of air or oxygen to produce a mixture of carbon monoxide, hydrogen, methane, and other gases. 

    Biomass gasifiers can be used to produce heat, electricity, or biofuels, and they are often used in decentralized energy systems, such as small-scale power plants or for providing heat in industrial processes. Gasification offers a way to utilize biomass resources efficiently while reducing greenhouse gas emissions compared to traditional combustion processes.