A wet flue gas purification system and method with energy saving function

Abstract

The application discloses a wet flue gas purification system and method with energy-saving functions, including a washing pump, a washing tower, a hot water pump and a hot water tank; the flue gas inlet is set on the wall of the washing tower, and the flue gas outlet is set on the top of the tower , the washing liquid circulation pool, washing liquid heat collector, washing liquid uniform distributor, washing liquid diversion tank layer, washing spray layer, water accumulation tray, condensation demister are arranged in the tower from bottom to top; washing liquid heat extraction The washing liquid distributor and the washing liquid distributor are located below the flue gas inlet; the washing liquid uniform distributor is located at the height corresponding to the flue gas inlet; the washing pump is connected to the washing liquid circulation pool and the washing spray layer; the inlet of the hot water pump is connected to the hot water tank and the outlet are respectively connected to the water inlet of the condensing demister and the water inlet of the washing liquid heater; the water outlet of the condensing demister is connected to the water inlet of the washing liquid heater, and the water outlet is connected to the outside of the washing tower. The application effectively recovers the low-grade heat of the flue gas in the wet desulfurization tower, and at the same time solves the problems of extremely uneven distribution of washing liquid and strong abrasiveness.

Description

technical field [0001] This application relates to the field of new energy and energy saving, in particular to a wet flue gas purification system and method with energy saving function. Background technique [0002] my country's industrial energy consumption accounts for about 70% of the country's total energy consumption, and the average unit energy consumption of major industrial products is about 30% higher than the international advanced level. In addition to factors such as relatively backward production technology and unreasonable industrial structure, the low utilization rate of industrial waste heat is an important reason for the high energy consumption per unit of industrial output value. my country's energy utilization rate is only about 33%, which is about 10% lower than that of developed countries. 50% of industrial energy consumption is directly discharged or discarded as various forms of waste heat. Among the waste heat that is directly discharged or discarded,...

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Problems solved by technology

[0004] Recovering the heat in the flue gas below 90°C after the cooler in the wet desulfurization tower can effectively avoid the problems of heat exchanger corrosion due to acid dew point and large water consumption of the wet desulfurization tower, but there are the following problems: 1. Existing The wet desulfurization system is mainly responsible for the flue gas purification function, and it is difficult to achieve low-grade waste heat extraction without affecting the flue gas purification efficiency; 2. The gas-liquid two-phase flow in the wet desulfurization tower is strong, and the distribution of the washing liquid is extremely uneven and wears out. Strong resistance, conventional heat exchangers are difficult to adapt to long-term stable operation

At present, the field of efficient recovery of low-grade waste heat in flue gas in the wet desulfurization tower is still blank

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