1. When the oven runs continuously for a long time (such as the drying tunnel of the spraying line, or the box-type oven can continuously open 4-5 furnaces), the coal-fired hot air.
The consumption cost of the heating system (semi-automatic) is the lowest; however, if it is operated intermittently (for the curing oven, only one oven a day).
Due to the fire and the residual carbon in the oven, the waste of dyes and labor is large, and the consumption cost of the coal-fired hot air heating system has no advantage at this time.
2. In the state of intermittent operation, the gas hot air heating system (automatic) has the lowest operating cost, and is convenient to start and shut down; even if it runs continuously for a long time, the consumption cost of the gas hot air heating system has a very large advantage. The first choice for curing oven; from the perspective of ease of use, degree of automation and cleanliness and environmental protection, the gas heating system (automatic) is also very good for the pipeline drying tunnel heating.
3. If the amount of spraying is very small, the far-infrared electric radiation heating system (fully automatic) with the least one-time investment can be considered. The advantages of the electric heating system are: the price is very low, and it is also fully automatic control; The disadvantages of electric heating system as below:
(1) The operating cost is high, which is the highest consumption among the 4 heating systems;
(2) The electric heating element of the heating system occupies a large space in the curing oven, and the actual usable volume of the curing furnace box of the same size will become smaller, especially the width;
(3) The workpiece must be kept at a certain distance from the electric heating element, otherwise the local temperature will be too high, resulting in chromatic aberration, which further reduces the available space in the curing oven.
