Wood gasifier

1. Principle of biomass gasifier

Biomass gasification refers to the process in which biomass gasification raw materials (such as straw, sawdust, rice husk, etc.) are pressed into shape or processed by simple crushing and drying, and then sent to a gasification furnace for gasification and cracking under anaerobic conditions. Under certain thermodynamic conditions, the high polymers of biomass undergo pyrolysis, oxidation, reduction, and reforming reactions with the help of some air (or oxygen) and water vapor. The tar associated with pyrolysis is further thermally or catalytically cracked into small molecule hydrocarbons, obtaining combustible gases containing CO, H2, and CH4 and purifying them to obtain product gas.

2. Advantages of biomass gas (biomass gasification gas)

In addition to the general characteristics of biomass fuel, biomass gas also has the following advantages:
▲ Environmentally friendly and clean gas fuel;
Good combustion characteristics and high burnout rate;
▲ Low sulfur content, only about 1/20 of fuel oil, can meet environmental protection requirements without taking any desulfurization measures;
▲ Low nitrogen content, no need to take any denitrification measures during combustion to meet environmental requirements;
▲ Low ash content;
▲ "0" emissions: The CO2 emitted from biomass combustion is the same as the CO2 absorbed during its growth process, and it replaces fossil fuels, reducing net emissions. According to the Kyoto Protocol mechanism, biomass fuel CO2 is an ecological "0" emission.

3. The calorific value, main components, and combustion products of biomass gas (biomass gasification gas)

1) The calorific value of biomass gas is generally 5-8 MJ/m3
2) The composition of biomass gas: Its main combustible components are CO, H2, CH4, some C2H4 polymer hydrocarbons, and a small amount of tar.
3) The combustion products of biomass gas: Biomass gas fuel is a renewable, environmentally friendly, and clean energy source with low sulfur content. The main combustion products are CO2, H2O, and N2.

4. Application of biomass gasifier and biomass gas

Biomass gas refers to the conversion of biomass raw materials into biomass combustible gas through high-temperature gasification in a biomass gasifier, which can replace fuel oil or natural gas and be used in steel kilns, glass kilns, and ceramic kilns.

The quality of biomass gas is basically equivalent to the coal to gas conversion (water gas) currently used in industry, but it has low dust and tar content.

Biomass gas is a very clean living and industrial fuel. Unprocessed biomass gas fuel can be directly transported through pipelines and applied to industrial kilns with lower fuel quality requirements, such as steel heating furnaces, copper smelting reflection furnaces, crucible boilers, industrial boilers, cement rotary furnaces, and refractory tunnel kilns; After undergoing purification processes such as dust removal and coke removal, its application range can be extended to industrial kilns with high fuel quality requirements, such as ceramic kilns, glass kilns, hot air stoves, and power plants.

5. Economic analysis of biomass gasifier:

Using the gas generated by biomass gasification furnaces to replace fuel oil or natural gas in industrial boilers (hot water boilers, thermal oil boilers, steam boilers) and some industrial kilns such as steel kilns, glass kilns, ceramic kilns, etc., can save more than 70% immediately! Here are four different types of biomass fuels for comparison:

The heat generated by biomass gas from 3.1-3.7 kilograms of straw is equivalent to the heat of 1 cubic meter of natural gas,

The heat generated by biomass gas from 3.5-4.1 kilograms of straw is equivalent to 1 liter of diesel.

The heat generated by biomass gas from 3.1-3.7 kilograms of rice husks is equivalent to the heat of 1 cubic meter of natural gas,

The heat generated by biomass gas from 3.5-4.1 kilograms of rice husks is equivalent to 1 liter of diesel.

The heat generated by biomass gas from 2.5-3 kilograms of sawdust and waste wood is equivalent to the heat of 1 cubic meter of natural gas,

The heat generated by biomass gas from 2.8-3.3 kilograms of rice husks is equivalent to 1 liter of diesel.

2The heat generated by biomass gas from 5-3 kilograms of wood chips is equivalent to the heat of 1 cubic meter of natural gas,

The heat generated by biomass gas from 2.8-3.3 kilograms of wood chips is equivalent to 1 liter of diesel.