Waste Heat Recovery Equipment

We offer a boiler exhaust gas recovery device, which uses the oxygen content in the exhaust gas to control the recovery flow rate. This allows the initially intended high-temperature exhaust gas to be recovered for reuse, achieving energy-saving benefits and reducing pollutant emissions.

    To achieve the above purpose, the technical means adopted in this creation include: a boiler body with an internal combustion chamber; a heating unit located at the front of the combustion chamber; an exhaust gas outlet located on the boiler body. Its characteristic is: the exhaust gas outlet connects a recovery pipe to the heating unit, and a blower is set on the recovery pipe, driven by a variable frequency motor; an oxygen sensor (O2 Sensor) is installed on the recovery pipe to measure the oxygen content in the exhaust gas, converting it to a voltage sent to a controller. The controller, with computer processing capability, receives signals from the oxygen sensor to control the speed of the variable frequency motor, thus automatically controlling the exhaust gas recovery flow rate based on the oxygen content in the exhaust gas.

In another feasible embodiment, its feature is: the exhaust gas outlet connects a recovery pipe to the heating unit, and a switch valve is set on the recovery pipe, driven by a servo motor; an oxygen sensor (O2 Sensor) is installed on the recovery pipe to measure the oxygen content in the exhaust gas, converting it to a voltage sent to a controller. The controller, with computer processing capability, receives signals from the oxygen sensor to control the operation of the servo motor, opening or closing the valve to automatically control the exhaust gas recovery flow rate based on the oxygen content in the exhaust gas.

In yet another feasible embodiment, its feature is: the exhaust gas outlet connects a recovery pipe to the heating unit, and a manual switch valve is set on the recovery pipe; an oxygen sensor (O2 Sensor) is installed on the recovery pipe to measure the oxygen content in the exhaust gas, converting it into a value displayed on an oxygen content display device, allowing manual control of the exhaust gas recovery flow rate based on the oxygen content in the exhaust gas.

With the aforementioned technical structure, this invention measures the oxygen content in the exhaust gas with an oxygen sensor and controls the exhaust gas recovery flow rate of the recovery pipe automatically or manually based on the oxygen content in the exhaust gas to achieve the optimal ratio. Besides energy-saving and carbon reduction, it also optimizes the boiler's efficiency.