Device for smoke condensation haze-eliminating and white-removing after wet desulphurization and technical method

Abstract

The invention relates to a device for smoke condensation haze-eliminating and white-removing after wet desulphurization and a technical method. The device comprises a smoke dehumidifier, a water spraying tower, a desulphurization tower and a smoke deep cooler. Preprocessed smoke exchanges heat with the discharged smoke to enter a chimney through the smoke dehumidifier; the smoke enters the water spraying tower through a draught fan; the smoke after being sprayed enters the desulphurization tower; the smoke after desulphurization treatment is differently treated according to different environmental temperatures; when the environmental temperature is low, the ambient air exchanges heat with the smoke after desulphurization in the smoke deep cooler under the effect of an air blower; and preheated air is supplied to a production system, so that the heat recycling is realized and the fuel energy consumption of the production system can be reduced. According to the smoke haze-eliminating and white-removing device and the technical method provided by the invention, the temperature of the smoke discharged to the atmosphere can be increased, the water content in the smoke and the contents of pollutants, such as NOx and SOx, can be reduced, the smoke diffusion speed is higher, and the generation of environmental haze can be extremely avoided.

Description

technical field [0001] The invention relates to the technical field of industrial flue gas purification treatment, in particular to a device and a process method for condensation, haze, and whitening of flue gas after wet desulfurization. Background technique [0002] In recent years, as environmental protection requirements have become increasingly stringent and smog has become more and more serious, the situation to achieve the goal of energy conservation and emission reduction is very severe. In particular, a series of policies and related emission standards have been formulated to promote energy conservation and emission reduction. In the face of boiler / electricity / petrochemical industries with large flue gas volumes, high H2O content after wet desulfurization, and flue gas containing NOx and SOx characteristics, causing the chimney to emit low-temperature wet white smoke containing pollutants. And subsequently brought a series of environmental problems. [0003] 1. Eq...

AI Technical Summary

Problems solved by technology

[0003] 1. Equipment corrosion: the problem of anti-corrosion treatment of wet chimneys. After the flue gas is desulfurized, although the content of sulfur dioxide in the flue gas is greatly reduced, after wet desulfurization, the humidity of the flue gas increases and the temperature decreases, so the flue gas is easily deposited on the inner wall of the chimney. Condensation, after the residual sulfur trioxide in the flue gas dissolves, it forms a highly corrosive dilute sulfuric acid solution, which corrodes the inner wall of the chimney

[0004] 2. The exhaust gas temperature is low, the diffusion range of pollutants such as NOx and Sox in the flue gas is reduced, and the vertical diffusion speed is low, which affects the surrounding environment;

Due to the current corrosion and leakage of GGH, domestic GGH cannot be widely used; 2. Adding a flue gas heater and using steam to heat the clean flue gas is also a solution, but it is very uneconomical

In most cases, the wet chimney scheme has the lowest investment, operation and maintenance costs. Based on economic considerations and no clear regulations, most of the newly designed wet desulfurization in my country chooses wet chimney operation. However, wet chimney operation produces The problem has not been fundamentally resolved, and with the gradual tightening of environmental protection, other factors such as smoke dispersion and opacity of the plume may overwhelm economic considerations

Images