Double-oxidation ammonia desulfurization process and device

Abstract

The invention discloses a double-oxidation ammonia desulfurization process and a double-oxidation ammonia desulfurization device. The device comprises an ammonia water preparation device, an absorption tower, a pre-scrubber, a buffer oxidation tank, a cyclone, a centrifugal machine, a drying bed, a tail gas scrubber, a packaging machine and an ammonia water storage tank. Sulfur dioxide is removedfrom flue gas by liquid ammonia, and ammonium sulfate crystals with the purity of over 99 percent are obtained; and the invention has the advantages that: the cost of the conventional ammonia desulfurization is reduced, the absorption efficiency is improved, the desulfurization efficiency is over 95 percent, the yield is improved, the ammonium sulfate crystals with the purity of over 99 percent are obtained, the waste is changed into treasure, economic benefit is increased, the ammonium sulfate yield is over 96 percent, and the ammonia escape volume is reduced and is less than 8mg / m<3>.

Description

technical field

[0001] The invention relates to a flue gas desulfurization process, in particular to a double ammonia oxidation desulfurization process and device, which uses liquid ammonia to remove sulfur dioxide in flue gas, and belongs to the field of chemical industry. Background technique

[0002] With the development of economy, the progress of society and the enhancement of people's awareness of environmental protection, the removal of SO2 from industrial flue gas has been paid more and more attention.

[0003] Ammonia desulfurization process is based on ammonia and SO 2 , The basic mechanism of water reaction to generate desulfurization products, mainly wet ammonia method, electron beam ammonia method, pulse corona ammonia method, simple ammonia method and so on.

[0004] The wet ammonia desulfurization process system is mainly composed of desulfurization washing system, flue gas system, ammonia storage system, ammonium sulfate production system (if it is not the a...

Examples

Embodiment 1

[0050] A hydrogen peroxide desulfurization process, comprising the following steps:

[0051] (1) Preparation of desulfurizing agent ammonia water, ammonia water is prepared from liquid ammonia through an ammonia water preparation device, the mass fraction of the prepared ammonia water is 20%, stored in the ammonia water storage tank, and pumped into the bottom circulation pipeline of the absorption tower by a circulation pump when in use;

[0052] The ammonia water preparation process is as follows: liquid ammonia enters two liquid ammonia gasification heat exchange devices respectively, and the ammonia water gasifies into an endothermic reaction, which can cool down the circulating water that is fed in, and at the same time cool down the ammonia water to be discharged, and the gasified The ammonia water gas mixture enters the spray ammonia water absorption device, mixes the circulating water and the preparation water to prepare ammonia water with a mass concentration of 20%, a...

Embodiment 2

[0064] Such as figure 1 and figure 2 Shown, a kind of hydrogen peroxidation method desulfurization device comprises ammonia water preparation device 10, absorption tower 4, pre-washing tower 5, buffer oxidation box 6, cyclone 7, centrifuge 8, drying bed 9, tail gas scrubber 11, Packaging machine 12, ammonia storage tank 101; described absorption tower 4 is provided with demister 1, rotary plate convection ammonia absorption device 2, spray layer 3 and 1 / 2 perforated plate 41 sequentially from top to bottom, described The bottom of the absorption tower 4 is a slurry pool 42; the ammonia water preparation device 10 is connected with the ammonia water storage tank 101, and the ammonia water storage tank 101 is connected with the buffer oxidation tank 6, and the described pre-washing tower 5 is connected with the bottom of the absorption tower 4 , the top of the absorption tower 4 is connected with the chimney; the pre-wash tower 5 is connected with the buffer oxidation tank 6, ...

technical field

[0001] The invention relates to a flue gas desulfurization process, in particular to a double ammonia oxidation desulfurization process and device, which uses liquid ammonia to remove sulfur dioxide in flue gas, and belongs to the field of chemical industry. Background technique

[0002] With the development of economy, the progress of society and the enhancement of people's awareness of environmental protection, the removal of SO2 from industrial flue gas has been paid more and more attention.

[0003] Ammonia desulfurization process is based on ammonia and SO 2 , The basic mechanism of water reaction to generate desulfurization products, mainly wet ammonia method, electron beam ammonia method, pulse corona ammonia method, simple ammonia method and so on.

[0004] The wet ammonia desulfurization process system is mainly composed of desulfurization washing system, flue gas system, ammonia storage system, ammonium sulfate production system (if it is not the a...

Examples

Embodiment 1

[0050] A hydrogen peroxide desulfurization process, comprising the following steps:

[0051] (1) Preparation of desulfurizing agent ammonia water, ammonia water is prepared from liquid ammonia through an ammonia water preparation device, the mass fraction of the prepared ammonia water is 20%, stored in the ammonia water storage tank, and pumped into the bottom circulation pipeline of the absorption tower by a circulation pump when in use;

[0052] The ammonia water preparation process is as follows: liquid ammonia enters two liquid ammonia gasification heat exchange devices respectively, and the ammonia water gasifies into an endothermic reaction, which can cool down the circulating water that is fed in, and at the same time cool down the ammonia water to be discharged, and the gasified The ammonia water gas mixture enters the spray ammonia water absorption device, mixes the circulating water and the preparation water to prepare ammonia water with a mass concentration of 20%, a...

Embodiment 2

[0064] Such as figure 1 and figure 2 Shown, a kind of hydrogen peroxidation method desulfurization device comprises ammonia water preparation device 10, absorption tower 4, pre-washing tower 5, buffer oxidation box 6, cyclone 7, centrifuge 8, drying bed 9, tail gas scrubber 11, Packaging machine 12, ammonia storage tank 101; described absorption tower 4 is provided with demister 1, rotary plate convection ammonia absorption device 2, spray layer 3 and 1 / 2 perforated plate 41 sequentially from top to bottom, described The bottom of the absorption tower 4 is a slurry pool 42; the ammonia water preparation device 10 is connected with the ammonia water storage tank 101, and the ammonia water storage tank 101 is connected with the buffer oxidation tank 6, and the described pre-washing tower 5 is connected with the bottom of the absorption tower 4 , the top of the absorption tower 4 is connected with the chimney; the pre-wash tower 5 is connected with the buffer oxidation tank 6, ...

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