Flue gas heat recovery device high in safety

Abstract

The invention discloses a flue gas heat recovery device high in safety. The device comprises a heat exchange component, a condensed water drainage component, a leakage and blocking monitoring component, a pressure release and stream exhaust component and a water-water heat exchanger, wherein the heat exchange component comprises a heat exchange shell and a gas-water heat exchange coil, a flue gas inlet and a flue gas outlet are formed in the two ends of the heat exchange shell respectively, a water inlet and a water outlet are formed in the gas-water heat exchange coil, and the gas-water heat exchange coil extends out of the side face of the heat exchange shell and is connected with an external circulating water pipe; the condensed water drainage component is connected to the heat exchange shell, and the leakage and blocking monitoring component is connected between the condensed water drainage component and the water inlet; the pressure release and stream exhaust component is connected to the water outlet; the two ends of the water-water heat exchanger are connected with the water inlet and the water outlet respectively. According to the flue gas heat recovery device, the structure is simple, the design is reasonable, the water drainage and pressure release function are achieved simultaneously, the heat exchange efficiency is high, leakage and blocking can be effectively monitored and treated, and the safety factor is high.

Description

technical field [0001] The invention relates to the field of boiler flue gas heat recovery, in particular to a high-safety flue gas heat recovery device. Background technique [0002] Flue gas is the product of fuel combustion during the working process of various fuel boiler equipment, which contains a large amount of waste heat, which is discharged into the atmosphere together with the flue gas. Flue gas waste heat recovery is mainly to convert the heat carried by the flue gas into usable heat through a certain heat exchange method, so as to improve the utilization rate of fuel. The high-temperature flue gas discharged from various boilers often takes away 20-50% of the heat supplied by the furnace, and the heat contained in the general boiler flue gas is also more than 10% of the total heat supplied. Therefore, in order to further improve the thermal efficiency of the boiler and achieve the purpose of saving energy and reducing consumption, it is an important energy-savi...

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Problems solved by technology

[0003] 1. High-temperature flue gas may cause the circulating water inside the heat exchange coil to boil, and eventually cause the heat exchanger to overpressure and explode;

[0004] 2. After the corrosive gas contained in the flue gas condenses, it can cause corrosion and leakage of the heat exchanger, causing a large amount of liquid water in the heat exchange coil to leak out and flow into the boiler furnace along the smoke pipe, and cause serious damage to the boiler;

[0005] 3. The flue gas contains a large amount of water vapor, which will partially or completely condense after cooling. If it cannot be effectively discharged, it will also flow into the furnace along the flue, causing damage to the boiler.

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