Regeneration technology of marine vanadium-titanium catalyst for SCR denitrification

Abstract

The invention relates to a regeneration technology of a marine vanadium-titanium catalyst for SCR denitrification. In the main technology, performance of the catalyst is recovered by calcination, oxidation, physical chemical cleaning, active liquid impregnation, drying and activation, etc. In the main technological flow, tail gas generated by calcination and oxidation, acid mist generated by ultrasonic cleaning, chemical cleaning and rinsing, water vapor generated by drying and tail gas generated by drying and activation are collected and then enter a scrubber tower to undergo acid and alkali absorption gas-washing, and discharging is carried out after the processed product reaches the standard. Wastewater generated by physical chemcial treatment in the main technological flow and wastewater generated from the scrubber tower are collected through a wastewater collector and then undergo deep treatment and recycling. Cleaned mud cakes undergo stabilization and solidification to form landfillable solidified blocks. Through the above technological steps, activity of an inactive marine denitrification catalyst can be recovered, zero emission of wastewater can be realized, up-to-standard release of exhaust gas is realized, and the marine catalyst can be recycled.

Description

Technical field [0001] The invention relates to a vanadium-titanium catalyst regeneration process for marine SCR denitration. Background technique [0002] The main power of large ships is generally large diesel engines, and their fuel is usually heavy oil with sulfur and high impurities. Therefore, the exhaust gas emitted by ships contains a lot of NO X , SO 2 , SO 3 As with PM2.5, the pollution caused by ships' exhaust gas to the port and coastal atmosphere cannot be ignored. At the same time, due to the global voyage of ocean-going ships, the pollution is not local, and its exhaust emissions have an impact on the entire earth's atmospheric environment. [0003] In view of the serious pollution of the exhaust gas emitted by ships, the International Maritime Organization passed the amendment to Annex VI "Regulations for the Prevention of Air Pollution from Ships" in October 2008, and formulated more stringent ship SO 2 , SO 3 , NO X Emission regulations. According to the amendment...

AI Technical Summary

Problems solved by technology

Marine catalysts can be regenerated by referring to the above methods, but the pollutants in marine SCR catalysts contain a large amount of oily substances, and it is not suitable to use the common power station denitrification catalyst cleaning and regeneration technology

Invention patent CN103920540A published by China "A method and device for regeneration of SCR denitrification catalyst in aftertreatment of diesel engine exhaust" proposes an ozone low-temperature charcoal regeneration method for online regeneration, which can only preliminarily solve the impact of carbon deposits on marine catalysts , but cannot solve the pollution of the catalyst by other substances such as oils, sulfides, alkali metals, arsenic, etc., nor can it solve the problem of catalyst failure due to the loss of active substances

Images