Water treatment process system and method for wet desulfurization

Abstract

The invention discloses a water treatment process system for wet desulfurization. The system comprises: a multilayer spray water collector arranged in a desulfurized flue to recover water in flue gas;an evaporative cooling tower, wherein a heat exchange pipeline and a spray pipeline are arranged in the evaporative cooling tower; a first path which communicates the circulating cooling water outletof the desulfurized flue with the heat exchange pipeline inlet of the evaporative cooling tower; a second path which communicates the heat exchange pipeline outlet of the evaporative cooling tower with the circulating cooling water inlet of the desulfurized flue to supply circulating cooling water to the multilayer spray water collector; and a third pass which communicates the wastewater outlet of a wet desulfurization absorption tower with the inlet of the spray pipeline of the evaporative cooling tower. The system can effectively combine the water saving and wastewater treatment effects ofa whole unit, and has a good economical performance and a good market prospect. The invention also provides a water treatment process method for wet desulfurization based on the system.

Description

technical field [0001] The invention relates to the technical field of environmental protection of thermal coal-fired units, in particular to a process system and method for wet desulfurization water treatment. Background technique [0002] With the rapid development of the economy, the consumption of energy resources has continued to increase in recent years. The atmospheric environment and resource conservation are facing unprecedented pressure. The atmospheric situation and water conservation situation are becoming increasingly severe. Based on the particularity of the industry, thermal power plants, as major water users, are also major pollutant dischargers. In addition, as the national environmental protection policy increasingly strengthens the control of total pollutant discharge, the scale of thermal power plants expands, resulting in continuous growth of total pollutant discharge and water resource consumption of thermal power plants. On the one hand, due to the un...

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Problems solved by technology

However, the cooling effect of this method is greatly affected by the ambient temperature. In the case of high ambient temperature, the cooling effect of the evaporative cooling tower is usually improved by spraying outside the heat exchange tube. The evaporative air-cooling tower has become another "big water consumer" and cannot fundamentally achieve effective water saving

[0005] In addition, in the existing wastewater treatment technology using hot flue gas spray evaporation, due to the limitation of its own structure, it is impossible to quickly complete the complete evaporation of desulfurization wastewater, and the incompletely evaporated desulfurization wastewater is attached to the flue wall. This results in fouling; even part of the desulfurization wastewater enters the electrostatic precipitator in a liquid state, causing the ash conveying pipe of the electrostatic precipitator to be blocked or even short-circuited in the electric field, thereby affecting dust emission

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