Full-automatic high-safety low-nitrogen hot air heating combustion system and operation method thereof

Abstract

The invention discloses a full-automatic high-safety low-nitrogen hot air heating combustion system and an operation method thereof. In the system, when the combustible gas component on the outlet side of a hot blast heater exceeds a safety set value, the total gas inlet pressure is lower than a set safety pressure value, the pressure of a combustion-supporting air pipeline is lower than the set safety pressure value, and the pressure in front of a main gas manual adjusting valve is higher than the set safety pressure value, an alarm is given to a controller so that the system cannot be started or automatically stops running; a first main gas cut-off valve and a second main gas cut-off valve are controlled by the controller, and whether the cut-off valves leak or not can be automatically detected by combining a pressure switch between the first main gas cut-off valve and the second main gas cut-off valve; an air-fuel proportional valve is connected into the combustion-supporting air pipeline through a pressure taking pipeline, and the air-fuel ratio is automatically adjusted in a linkage mode in real time through the pressure of the combustion-supporting air pipeline; a first ignition gas cut-off valve and a second ignition gas cut-off valve are controlled by the controller; and the controller can conduct PID control over an electric adjusting valve according to the difference value between the temperature uploaded by a thermocouple and the target temperature. The full-automatic high-safety low-nitrogen hot air heating combustion system is high in safety and stability and ultralow in NOx emission.

Description

technical field [0001] The invention belongs to the technical field of hot air heating, and in particular relates to a fully automatic high-safety low-nitrogen hot air heating combustion system and an operating method thereof. Background technique [0002] The hot air heating system is widely used in the industrial field. According to the different heating temperature of the hot air, it is mainly divided into high temperature hot air heating (above 750°C) and medium and low temperature hot air heating (normal temperature to 750°C). Among them, the medium and low temperature hot air heating is more widely used. , Such as strip steel coating drying, automotive coating drying, paper drying, textile tenter setting, industrial packaging, indoor temperature adjustment and other fields. According to different heating methods, it is mainly divided into electric heating and gas heating. Among them, gas heating has more cost advantages and is favored by more and more industrial enterp...

AI Technical Summary

Problems solved by technology

However, there is a natural safety risk in the low-temperature heating of gas. Due to the low temperature of the combustion environment, the safe self-ignition point temperature cannot be reached after the gas is introduced, and the combustion itself will cause the formation of nitrogen oxides.

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