Low temperature flue gas waste heat utilization, desulphurization, denitration and white smoke elimination integrated system of industrial furnace

Abstract

The invention discloses a low temperature flue gas waste heat utilization, desulphurization, denitration and white smoke elimination integrated system of an industrial furnace. The system comprises asupercharging wind turbine, a multi-refrigerant heat exchange system, a flow control valve, a flow meter, a flue gas condensation and denitration reactor, an alkaline pool, a demisting filter and a chimney. The system has the following advantages that convenience is provided for operation of the industrial furnace, and online construction is realized; fuel consumption is reduced, and the thermal efficiency of the industrial furnace is improved; the service life of system equipment and parts is ensured; flue gas waste heat utilization, desulphurization, denitration and white smoke elimination are integrated; the denitration efficiency is >=80% and the desulphurization efficiency is >=90%; water consumption is reduced; the land occupation area is reduced, and the cost is reduced; droplet water in the discharged flue gas is reduced; the concentration of pollutants in the local region near the chimney is reduced; energy is saved, environment pollution is reduced, and visual pollution is eliminated; energy-saving, emission-reducing, water-saving and steam-saving are all realized; the operation cost is low; and the application range is wide.

Description

technical field [0001] The invention relates to an integrated system for utilization of waste heat from low-temperature flue gas of an industrial furnace and desulfurization, nitric acid and white smoke elimination. Background technique [0002] The conventional desulfurization and denitrification currently applied are two independent systems. And the reaction temperature required by each is different. [0003] The temperature range of the denitrification reaction is 250~590°C. The desulfurization reaction temperature is 50~60°C. [0004] In a conventional desulfurization system, the temperature of the flue gas entering the desulfurization tower is generally around 120°C, while the desulfurization reaction requires a temperature of 50-60°C. Therefore, it is necessary to cool the flue gas with a large amount of precious water, so that when the flue gas is finally discharged into the chimney , with a high water content. If the flue gas is not reheated, a "wet chimney" phen...

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Problems solved by technology

[0008] At the same time, since the flue gas produced by fuel combustion contains a large amount of water vapor (content 10-20%), its latent heat of vaporization (accounting for about 10% of the low calorific value of the fuel) is discharged with the flue gas, resulting in a great waste of energy

[0009] Moreover, under low thermal efficiency, the amount of flue gas emission is large, the amount of pollutant emission is large, the concentration of pollutant emission is high, and the environmental pollution is serious.

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