Improved MVR (mechanical vapor recompression) device applied to zero discharge of catalyst regeneration wastewater

Abstract

The invention relates to an improved MVR (Mechanical Vapor Recompression) device applied to zero discharge of catalyst regeneration wastewater. The improved MVR device comprises a wastewater buffer tank, a raw material pump, a condensate water heat exchanger, a steam heat exchanger, an evaporation pre-degassing tank, a feeding pump, a circulating heater, a circulating separator, a thickening kettle and a centrifugal machine which are sequentially connected in series, an outlet of the wastewater buffer tank is connected with an inlet of the condensate water heat exchanger through a raw material pump, an outlet of the condensate water heat exchanger is connected with an inlet of the steam heat exchanger, and an outlet of the steam heat exchanger is connected with an inlet of the evaporation pre-degassing tank; the outlet of the circulating heater is connected with the inlet of the circulating separator; and the bottom liquid part of the circulating separator flows back to the inlet of the circulating heater. The system has the beneficial effects that a system heat source is fully utilized, and heating energy consumption is reduced. Good heat transfer efficiency is guaranteed, the use amount of heating medium steam is reduced, and system energy consumption is reduced. The overall structure is compact.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an improved MVR device applied to zero discharge of catalyst regeneration wastewater. Background technique [0002] my country's coal-fired power plants have generally adopted desulfurization and denitrification systems to treat flue gas pollutants. As the core component of SCR, denitrification catalysts are used in large quantities and account for a relatively high proportion of denitrification project investment. Due to flue gas pollution, the denitrification catalyst has deactivation such as poisoning and dust accumulation, and its service life is usually about 3 years. The secondary utilization of the spent catalyst after regeneration can significantly reduce the denitrification operation cost of the coal-fired power plant, and has significant economic and environmental benefits. [0003] At present, the regeneration of domestic denitrification catal...

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Problems solved by technology

[0003] At present, the regeneration of domestic denitrification catalysts is mainly based on centralized regeneration and disposal in factories. In the process of cleaning with ultrasonic water and chemical cleaning, regeneration wastewater will be generated, which contains a large amount of suspended solids, heavy metals, surfactants and other polluting components. The difference fluctuates greatly, and it is difficult for conventional treatment technologies to meet the relevant discharge indicators of the "Vadium Industry Pollutant Discharge Standard" (GB26452-2011) and "Sewage Comprehensive Discharge Standard" (GB8978-1996). With the further improvement of environmental protection requirements , zero discharge of catalyst regeneration wastewater through MVR and other technologies will be the best process direction

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