A heat exchange system and process for scr-rto outlet flue gas

Abstract

The invention provides a heat exchange system for SCR-RTO outlet flue gas, which includes an RTO regenerative oxidation furnace, an SCR reactor, a denitration heat exchanger, a mixed heat flue, an ammonia water evaporation system, an ammonia injection heat exchanger and a fan. The denitrification heat exchanger, the RTO thermal storage oxidation furnace, the SCR reactor, the ammonia injection heat exchanger and the denitrification heat exchanger are sequentially connected through pipelines, the combustion chamber of the RTO thermal storage oxidation furnace, the outlet of the SCR reactor, the fan The inlet and the ammonia injection heat exchanger are all connected to the heat mixing flue through pipes, the outlet of the fan is connected to the ammonia water evaporation system, and the ammonia water evaporation system is connected to the inlet of the SCR reactor. A valve control system within the pipeline. The invention can solve the overheating of the RTO combustion chamber. By using this part of waste heat, the temperature of the flue gas at the outlet of the RTO is raised by means of the SCR outlet. After the RTO and the SCR cooperate to mix heat, the temperature requirements of ammonia injection and catalytic reduction for denitrification are completed. Realize the utilization of waste heat and optimize the process flow.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a heat exchange system and process for flue gas at the outlet of an SCR-RTO. Background technique [0002] RTO is a regenerative thermal oxidizer, which is a thermal combustion method with a regenerative bed. It is mainly composed of a combustion system, a heat storage system (generally a ceramic heat storage body), a valve reversing system, and a smoke exhaust system. It is mainly used to treat VOCs. During the treatment process, the temperature of the combustion chamber is about 700-850°C, and the organic waste gas is oxidized and decomposed into CO 2 and H 2 O. However, due to the high concentration of CO and VOCs in the flue gas after sintering, the heat energy released by it sometimes makes the temperature inside the RTO relatively high. The heat energy generated by this part has a great influence on the operation of RTO. [0003] The current mainstream me...

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Problems solved by technology

[0008] Aiming at the deficiencies in the prior art, the present invention provides a heat exchange system for SCR-RTO outlet flue gas, which solves the difficulty in the SCR inlet temperature (mainly ammonia injection temperature) existing in the prior art after heat exchange. The temperature after control and heat exchange cannot meet the process requirements, and it is necessary to use a heating furnace to supplement heat and increase fuel consumption, which increases energy consumption costs

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