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Indirect gas-fired hot blast stove is mainly suitable for low temperature drying of thermosensitive materials when direct contact with drying materials is not allowed. For example: milk powder, medicine, synthetic resin, fine chemical industry, etc. Heating is a device that uses steam, heat conducting oil and flue gas as carriers to heat air through various heat exchangers. The basic principle of indirect hot stove is heat transfer. The larger the heat transfer area, the higher the heat transfer rate, the better the energy saving effect of the hot blast stove, and the longer the service life of the stove and heat exchanger. On the other hand, the size of heat transfer area can also be identified from the flue gas temperature. The lower the flue gas temperature, the higher the heat transfer rate and the larger the heat transfer area. 间接式分类在工作原理上可分为蓄热式和换热式两种：
The classification of indirect hot blast stoves can be divided into two types: regenerative type and heat exchange type.
Regenerative type, according to the regenerator inside the hot blast stove, divided into spherical hot blast stove (referred to as spherical furnace) and lattice brick hot blast stove, according to the combustion mode can be divided into top combustion, internal combustion, external combustion and other types. How to improve the wind temperature is a long-term research direction of the industry. The commonly used methods are mixing high calorific value gas, increasing the heat transfer area of lattice brick of hot blast stove, changing the material and density of lattice brick, or changing the shape of regenerator (such as regenerative ball), and preheating gas and combustion-supporting air by various methods.
Advantages: high heat transfer temperature and high heat utilization rate.
Disadvantages: large volume, large area, unstable hot air temperature, many switching mechanisms, easy to go wrong, short life of regenerator, high maintenance cost, high purchase cost.
The heat exchanger mainly uses the heat-resistant heat exchanger as the core component. This component can not use the metal heat exchanger of the ceramic hot air stove. It can only use the heat-resistant ceramic heat exchanger. The gas is fully burned in the combustion chamber. After burning, the hot air can be exchanged for fresh cold air through the heat exchanger to make fresh air. The temperature is over 1000 degrees.
Advantages: high heat transfer temperature, high heat utilization rate, small volume, stable hot air temperature, no switching mechanism, long life, high maintenance cost, low purchase cost.
Disadvantage: The heat transfer temperature is not as high as regenerative type, which appears later and is not widely used.
The types of hot stoves can be divided into direct type and indirect type according to their working principles. What is the difference between them? The main difference between direct and indirect hot stoves is the difference in thermal efficiency. Direct hot stoves do not need heat transfer and have higher thermal efficiency. The indirect hot blast stove needs to be converted by heat exchanger, so its efficiency is naturally lower.
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