Air supply system and method for industrial furnace

Abstract

The invention provides an air supply method of an industrial furnace. When air pressure is required to be increased, opening degrees of air doors of frequency conversion fans are increased; when the air pressure is required to be further increased, opening degrees of air doors of constant-speed fans are increased; when the air pressure is still required to be increased, working frequency of each frequency conversion fan is increased; when the air pressure is required to be decreased, the working frequency of each frequency conversion fan is decreased; when the air pressure is required to be further decreased, the opening degrees of the air doors of the frequency conversion fans are decreased; and when the air pressure is still required to be decreased, the opening degrees of the air doors of the constant-speed fans are decreased. The air supply method of the industrial furnace has the advantages as follows: for the fan units operating in an air door adjustment mode, only part of fans are subjected to frequency conversion renovation; and on the basis that the air pressure is stably adjusted through frequency conversion, the part of fans and other fans are controlled coordinately and combined to the overall fan unit network for stable operation.

Description

technical field [0001] The invention relates to an industrial furnace air supply system and a method thereof, which keep the pressure of the industrial furnace combustion-supporting hot air stable during the combustion process of the industrial furnace. Background technique [0002] At present, the air pressure automatic adjustment technology of domestic industrial furnace fan units is basically realized by adjusting the opening of each fan inlet damper, and controlling the output pressure parameters of the main pipe by changing the blade angle within a range of 90 degrees. The characteristic of this solution is that the investment cost is low, but the damper damper adjustment increases the pipeline resistance while throttling, and the motor needs to consume extra power to overcome the increased pipeline resistance, resulting in increased energy consumption. [0003] With the development of motor frequency conversion technology, some domestic single fans have begun to use fr...

AI Technical Summary

Problems solved by technology

The frequency conversion scheme has many advantages: energy saving in operation, stable start, and quick response, but its investment cost is relatively high. For the same fan, the investment of the frequency conversion scheme may be 15 to 20 times that of the damper adjustment scheme.

In general large-scale production equipment, multiple fans are usually operated in parallel. If all fans are driven by frequency conversion, the investment will be too large.

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