Recycling ammonia desulphurization process

An ammonia-based desulfurization and recycling technology, applied in the field of flue gas desulfurization, can solve the problems of high cost of manganese carbonate and low oxidation efficiency, achieve high product quality, simple process operation, and meet the requirements of industrial production

Active Publication Date: 2015-07-01
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Abstract
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Problems solved by technology

[0005] Aiming at the problems of low oxidation efficiency and high production cost of manganese carbonate in the traditional ammonia desulfurization process for preparing ammonium sulfate in the prior art, the object of the present invention is to provide a desulfurization product obtained by using ammonium bicarbonate as a flue gas desulfurization agent. , and then cleverly use desulfurization products to reduce pyrolusite and obtain high-purity manganese carbonate and ammonium sulfate products at the same time. , to meet industrial production

Method used

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  • Recycling ammonia desulphurization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A. Desulfurization: Ammonium bicarbonate, part of ammonium sulfate solution, and a certain proportion of process water are configured to form an ammonium bicarbonate solution with a concentration of 20% ammonium bicarbonate, which is input into the ammonium absorption tower through the slurry pump and is in reverse contact with the flue gas. SO 2 The concentration is 2100mg / Nm 3 The flow velocity of the flue gas passing through the absorption tower is 5m / s, and the liquid-gas ratio in the tower is 10L / m 3 , ammonium bicarbonate and SO in flue gas 2 A reaction occurs and ammonium bisulfite is formed. After desulfurization, SO 2 The removal efficiency is 97%, SO in the net flue gas 2 The concentration is 65mg / Nm 3 .

[0044] B. Oxidation regeneration: the desulfurized slurry is transported to the oxidation regeneration reactor, where the ammonium bisulfite is replaced by MnO in pyrolusite (manganese content 25%, 220 mesh) 2 For oxidation regeneration, the blower blo...

Embodiment 2

[0048] A. Desulfurization: Ammonium bicarbonate, part of ammonium sulfate solution, and a certain proportion of process water are configured to form an ammonium bicarbonate solution with a concentration of 26% ammonium bicarbonate, which is input into the ammonium absorption tower through the slurry pump and is in reverse contact with the flue gas. SO 2 The concentration is 2400mg / Nm 3 The flow velocity of the flue gas passing through the absorption tower is 3.4m / s, and the liquid-gas ratio in the tower is 10L / m 3 , ammonium bicarbonate and SO in flue gas 2 A reaction occurs and ammonium bisulfite is formed. After desulfurization, SO 2 The removal efficiency is 97%, SO in the net flue gas 2 The concentration is 72mg / Nm 3 .

[0049] B. Oxidation regeneration: the desulfurized slurry is transported to the oxidation regeneration reactor, where the ammonium bisulfite is replaced by MnO in pyrolusite (30% manganese content, 220 mesh) 2 Oxidation regeneration, the blower blows...

Embodiment 3

[0053] A. Desulfurization: ammonium bicarbonate and the precipitated liquid in Step C of Example 2 and a certain proportion of process water are configured to form an ammonium bicarbonate solution with a concentration of 18% ammonium bicarbonate, which is input into the ammonium absorption tower through the slurry pump and is in reverse contact with the flue gas. , SO 2 The concentration is 2000mg / Nm 3 The flow velocity of the flue gas passing through the absorption tower is 5m / s, and the liquid-gas ratio in the tower is 10L / m 3 , ammonium bicarbonate and SO in flue gas 2 A reaction occurs and ammonium bisulfite is formed. After desulfurization, SO 2 The removal efficiency is 97%, SO in the net flue gas 2 The concentration is 60mg / Nm 3 .

[0054] B. Oxidation regeneration: the desulfurized slurry is transported to the oxidation regeneration reactor, where the ammonium bisulfite is replaced by MnO in pyrolusite (30% manganese content, 220 mesh) 2 For oxidation regenerati...

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Abstract

The invention discloses a recycling ammonia desulphurization process. According to the process, ammonium bicarbonate is used as an absorption agent to absorb sulfur dioxide smoke so as to generate an ammonium bisulfate intermediate product, the ammonium bisulfate intermediate product is used for reducing and carbonizing pyrolusite by utilizing the oxidization performance of the pyrolusite, and high-quality manganese carbonate and ammonium sulfide products are obtained; the sulfur dioxide smoke, ammonium bicarbonate and pyrolusite raw materials selected in the process are wide in source and cheap in price, the manganese carbonate and ammonium sulfide products with relatively high additional values are obtained, the economic benefit is remarkable, and the problems of low oxidization efficiency in the process of preparing ammonium sulfide from ammonium bisulfate and high production cost in the manganese carbonate preparation process can be overcome; moreover, the process is simple to operate, the process conditions are moderate, the reaction can be completed under a room temperature condition, the prepared product is high in quality, and the industrialized production requirement can be met.

Description

technical field [0001] The invention relates to a process for desulfurizing sulfur dioxide flue gas by using ammonium bicarbonate as a desulfurizing agent, and using the obtained product to reduce pyrolusite and co-produce manganese carbonate and ammonium sulfate, belonging to the technical field of flue gas desulfurization. Background technique [0002] Wet desulfurization technologies mainly include limestone method, double alkali method, ammonia method, etc. The ammonia desulfurization process is a green process, which can use liquid ammonia, ammonia water, ammonium bicarbonate, etc. as desulfurizers. Ammonia, ammonium bicarbonate, etc. are used as desulfurizers to react with sulfur dioxide in the flue gas, and air is blown in to oxidize ammonium sulfite to ammonium sulfate. Due to the poor effect of forced oxidation of ammonium sulfite, the quality of ammonium sulfate produced is not good. high. Therefore, the development of an ammonia desulfurization process that can ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/96C01G45/00C01C1/24
Inventor 杨有余曾毅夫叶明强周益辉
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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