Ammonia process type double-cycle desulfurization and denitrification dust removal system

Abstract

The invention discloses an ammonia process type double-cycle desulfurization and denitrification dust removal system and belongs to the technical field of environmental protection equipment. The system comprises a cleaning absorbing tower and an oxidation circulation tank, wherein the cleaning absorbing tower sequentially comprises an efficient water mist removal section, a reinforced ammonia mist removal section, an absorption liquid mist removal section, a secondary absorption section, a primary absorption section and a cleaning cooling section; the oxidation circulation tank sequentially comprises an oxidation section, a secondary absorption liquid circulation section and a primary absorption liquid circulation section; the oxidation section is communicated with the cleaning cooling section through a pipeline; the secondary absorption liquid circulation section is communicated with the secondary absorption section through a pipeline; the primary absorption liquid circulation section is communicated with the primary absorption section through a pipeline. The system has the advantages that the desulfurization efficiency is high, generation of ammonia escape, aerosol and particulate matters is reduced from the start and blocked in the process, and the system has high adaptability to coal types and boiler load changes, occupies small area and is compact in arrangement and simple to mount and requires less investment.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to an ammonia-based double-cycle desulfurization, denitrification and dust removal system. Background technique [0002] my country's sulfur dioxide emissions are huge, causing serious pollution to the atmospheric environment. The emissions rank first in the world, exceeding the self-purification capacity of my country's atmospheric environment. The area with an annual precipitation pH value of less than 5.6 accounts for about 40% of the country's land area, causing huge economic losses. , Seriously affect my country's ecological environment and people's health. SO 2 Emissions and the formation of acid rain mainly come from industries such as coal-burning, metallurgy, and chemical industry. [0003] With the development of economy and technology and the deepening of the concept of circular economy, the ammonia method highlights its advantages, with high d...

AI Technical Summary

Problems solved by technology

[0004] Affected by factors such as the improvement of emission standards and changes in the quality of coal-fired coal, when the flue gas SO 2 When the concentration is high (≥4000mg / Nm 3 ), when the desulfurization rate is high (>99%), ammonia desulfurization adopts a single-stage absorption process, the operating pH value of the absorption liquid is high, the density of the absorption liquid is high, the oxidation rate of the system is low, and it is easy to cause aerosol generation and the concentration of discharged particulate matter High (>20mg / Nm 3 ), the tailing phenomenon of flue gas at the outlet of the desulfurization device is serious, which cannot meet the emission requirements

Simply increase the spray layer in the internal desulfurization tower to increase SO 2 The absorption rate can no longer meet the current environmental protection standards, and the traditional technology must be improved and innovated to develop a double-cycle desulfurization, denitrification and dust removal technology

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