A flue gas acid production system that recovers the low-level heat of the second suction process

A technology for making acid and flue gas from flue gas, which is applied in the direction of inorganic chemistry, chemical instruments and methods, sulfur compounds, etc., can solve the problems of unusable and waste of heat, and achieve the effect of reasonable setting, economic benefits and huge economic benefits

Active Publication Date: 2021-05-28
中化重庆涪陵化工有限公司
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Problems solved by technology

Due to the low acid temperature at the outlet of the existing second-absorption tower, it cannot be utilized by the acid-making process system. At present, all the heat of the outlet acid of the second-absorption tower is discharged into the air through the cooling tower, resulting in part of the heat in the second-absorption process. waste of

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  • A flue gas acid production system that recovers the low-level heat of the second suction process
  • A flue gas acid production system that recovers the low-level heat of the second suction process
  • A flue gas acid production system that recovers the low-level heat of the second suction process

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with embodiment, but does not limit the present invention thereby. The operation methods and devices involved in the following examples are conventional methods and devices unless otherwise specified.

[0025] The invention provides a second absorption tower capable of realizing low-level heat recovery. The second absorption tower is used for secondary absorption of sulfur trioxide in the sulfuric acid preparation process. The second absorption tower includes a tower body and an acid separation tower arranged on the upper part of the tower device, the packing arranged under the acid separator and the acid circulation tank arranged at the bottom of the tower body, the spray density of the acid separator of the second suction tower is set at 2.0-3.5m 3 / m 2 · h; the packing of the second suction tower is set as a ceramic packing with a diameter of 20-50 mm.

[0026] The spray density of 98% sulfuric ac...

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Abstract

The invention discloses a flue gas acid production system for recovering low-level heat of a second-suction process, which includes a fan, a converter, a first-suction tower and a second-suction tower connected through gas pipelines, the second-suction tower includes a tower body, and is arranged on the tower body. The upper part of the acid distributor, the packing arranged under the acid distributor and the acid circulation tank arranged at the bottom of the tower body, the spray density of the acid distributor is 2.0-3.5m 3 / m 2 h; the filler is a φ20-50mm ceramic filler; the outlet end of the acid circulation tank of the second absorption tower is connected to the first preheater and the second preheater through a liquid pipeline; the first preheater is arranged at the The flue gas inlet of the fan; the second preheater is arranged at the flue gas outlet of the first suction tower. The flue gas acid production system provided by the invention can recover low-level heat in the secondary suction process, the system improvement is simple and feasible, economic costs can be saved, and huge economic benefits can be realized.

Description

technical field [0001] The invention relates to the technical field of low-level heat recovery in a sulfuric acid preparation process, in particular to a flue gas acid production system for recovering low-level heat in a secondary suction process. Background technique [0002] Sulfuric acid is an important basic chemical raw material and the most important product in the chemical industry with a wide range of uses. At present, the methods commonly used in the industry to produce sulfuric acid include pyrite acid production method, sulfur acid production method and smelting flue gas acid production method. The commonly used industrial acid production process usually adopts the "two conversion and two suction" production process, that is, the SO produced by pyrite calcination and sulfur incineration 2 or SO from smelting flue gas 2 Converted to SO for the first time by the converter 3 , SO generated by one conversion 3 Then it is absorbed through a suction tower, and the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/80
CPCC01B17/80
Inventor 陈廷明冯永刚罗于庆
Owner 中化重庆涪陵化工有限公司
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