Flue gas waste heat recovery and utilization method

Abstract

The invention belongs to the technical field of energy recovery, and particularly discloses a flue gas waste heat recovery and utilization method using a flue gas waste heat recovery device for wasteheat recovery. The flue gas waste heat recovery and utilization method comprises the following operation steps that (1) before using, the operation situation of the device is checked firstly; (2) a heating cylinder is fully filled with water, under the effect of a floating ball, a first through opening is opened, and a second through opening is plugged; (3) after the second through opening is plugged, the water is added into an upper cavity of a water storage tank; (4) flue gas generated during working of a boiler is led into a flue gas channel; (5) water in a heat-insulation water tank is conveyed to the place where water needs to be used; and (6) the surplus water in the upper cavity is checked regularly, and the water in the upper cavity is replenished in time. Waste heat of the flue gas is recycled through the flue gas waste heat recovery and utilization method, thus energy is effectively recycled, and the thermal efficiency of the boiler is improved.

Description

technical field [0001] The invention belongs to the technical field of energy recovery, and in particular relates to a method for recovering and utilizing flue gas waste heat. Background technique [0002] At present, for boilers, whether they are coal-fired boilers, gas-fired boilers, oil-fired boilers, or biomass boilers, there is a problem of low thermal efficiency. Among them, the loss of exhaust gas is one of the most important reasons for the low thermal efficiency of boilers. The temperature of the flue gas discharged from these boilers is as high as 90 degrees. The flue gas is directly discharged to the outside after environmental protection treatment, and the heat of the flue gas cannot be effectively used. my country is a large coal-fired country. Tens of millions of tons of smoke and dust are discharged, and the heat of the flue gas cannot be recovered, resulting in a great waste of resources. Therefore, the recovery of waste heat from flue gas has become the main ...

AI Technical Summary

Problems solved by technology

[0002] At present, for boilers, whether they are coal-fired boilers, gas-fired boilers, oil-fired boilers, or biomass boilers, there is a problem of low thermal efficiency. Among them, the loss of exhaust smoke is one of the most important reasons for the low thermal efficiency of boilers.

The temperature of the flue gas discharged from these boilers is as high as 90 degrees. The flue gas is directly discharged to the outside after environmental protection treatment, and the heat of the flue gas cannot be effectively used. my country is a large coal-fired country. There are tens of millions of tons of smoke and dust discharged, and the heat of the flue gas cannot be recovered, resulting in a great waste of resources. Therefore, the recovery of waste heat from flue gas has become the main research direction for improving the thermal efficiency of boilers.

Images