Exhaust gas recycling control system of combustion device

Abstract

An exhaust gas recycling control system includes a combination device, having inlet and exhaust ends. The exhaust end is connected to the inlet end by a recycling tube which has a control valve to control an open or closed state. An oxygen sensor mounted detects oxygen content in an exhaust gas and convert the oxygen content detected signal into a voltage signal sent to a controller. The controller controls the control valve to open or close. When the oxygen content of the exhaust gas is higher than a threshold, the control valve opens and a high oxygen content of exhaust gas flows through the recycling tube to the inlet end.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to an exhaust gas recycling control system of combustion device, and more particularly to an oxygen content of exhaust gas as a control of the opening or closing the backflow path.[0003]2. Description of the Related Art[0004]Due to the rising of the oil and electricity prices and the greenhouse effect, energy-saving and carbon reduction have become serious issues in our life and industry, especially in industry. The fuel as an energy source is required for all kinds of boilers, incinerators, power generation device, etc. However, a lot of exhaust gas is inevitably generated during the combustion process of these devices, and is constantly emitted to the atmosphere. A boiler as an example has the following drawbacks:[0005]1. Generally, the emission temperature of a boiler is between 150° C. and 208° C. Such a high temperature of exhaust gas emitted to the atmosphere not only causes air pollution but...

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Benefits of technology

[0014]Base on the features disclosed, the present invention provides the recycling tube and the oxygen sensor to detect the oxygen content in an exhaust gas and send the high oxygen content to the inlet end, and thus to greatly reduce the

Problems solved by technology

Due to the rising of the oil and electricity prices and the greenhouse effect, energy-saving and carbon reduction have become serious issues in our life and industry, especially in industry.

However, a lot of exhaust gas is inevitably generated during the combustion process of these devices, and is constantly emitted to the atmosphere.

2. The continuous emission of the exhaust gas of 150° C. to 280° C. causes continuous loss of the temperature of a combustion chamber; such that, the fuel and cold air must be continually add into the device, resulting in increasing costs.

3. The average oxygen content of the above-mentioned exhaust gas is over 9%, even up to 18%. The boiler, for example,

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