Heat carrier boiler refers to a new type of heat energy conversion equipment in which the heat carrying working medium is high temperature heat conducting oil (also known as hot coal body, heat carrier). The capacity of the furnace is also usually expressed by "MW" (megawatt), and the old unit is also expressed by "million kilowatts/hour" or "million kcal/ hour", that is, "104kcal/h". Organic heat carrier boilers, also known as heat-conducting oil furnaces, are widely used because of their advantages of "high temperature and low pressure" and smooth operation.