Environment-friendly and energy-saving boiler with flue gas recirculation function

The environment-friendly and energy-saving boiler comprises a boiler body, the outer side of the boiler body is sleeved with an installation sleeve, the bottom of the installation sleeve is fixedly connected with a supporting frame, a base is installed at the bottom of the supporting frame, and the bottom of the boiler body communicates with an exhaust pipe; the positions, located on the two sides of the exhaust pipe, of the bottom of the boiler body communicate with air inlet pipes correspondingly, a device cylinder is installed at the bottom of the boiler body, and a filtering device is installed in the device cylinder. The filter device comprises a filter cartridge and a filter screen, the filter cartridge is provided with a cylindrical structure, the filter screen is arranged on the outer side of the filter cartridge, and a brushing device is mounted on the inner wall of the filter cartridge; the invention relates to the technical field of environment-friendly and energy-saving boilers. According to the e