Why does wet cotton spontaneously ignite?

According to the personal database, the reasons why wet cotton will spontaneously ignite are as follows:

Cotton itself is a flammable substance, containing a lot of cellulose, which can react with oxygen in the air to generate heat and flame.

When cotton is wet, it will be fermented by microorganisms, and heat and flammable gases, such as carbon monoxide and methane, will be produced in the process.

Cotton has a good thermal insulation effect. If the cotton is stacked too densely or poorly ventilated, the heat inside the cotton will be difficult to dissipate, which will lead to an increase in temperature.

When the temperature inside cotton reaches its ignition point (about 150℃), it will spontaneously ignite and burn from the inside out.

Therefore, attention should be paid to moistureproof, fire prevention and ventilation measures to avoid spontaneous combustion accidents.