Boiler economizer

The invention discloses a boiler economizer comprising a thermal insulation shell and a water storage layer. One side of the top of the thermal insulation shell is connected with a smoke inlet, and the other side of the top of the thermal insulation shell is connected with a smoke outlet; high-temperature resistant filter bags are installed below the smoke inlet and the smoke outlet, and the side,close to the smoke inlet, of the water storage layer communicates with a cold water inlet; the other side of the water storage layer communicates with a hot water outlet, and the inner side of the water storage layer communicates with coiled pipes wound around the high temperature resistant filter bags; and a plurality of heat conduction fins are installed on the inner side of the water storage layer uniformly. The boiler economizer has the beneficial effects that the contact area between high temperature smoke and heat exchange media is increased, so that the heat exchange efficiency of equipment is improved; the energy-saving efficiency is high, and meanwhile the high-temperature resistant filter bags are arranged, and can be used for filtering the high temperature smoke in the boiler economizer; an ash clearing mechanism is arranged, so that massive accumulation of ash in the boiler economizer is reduced effectively; the heat exchange efficiency is ensured, and the energy-saving efficiency is further improved; and the service life of the equipment is further prolonged.