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A desulfurization tower packing for seawater desulfurization and preparation method thereof

A desulfurization tower, seawater technology, applied in separation methods, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of large area of ​​water quality recovery system and large area of ​​aeration tank , long hydraulic retention time, etc., to achieve the effect of enhancing flue gas desulfurization efficiency, saving design volume, and reducing gas-liquid ratio

Active Publication Date: 2016-01-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the slow oxidation of S(IV) in seawater, the water quality recovery system has problems such as large footprint and large power consumption, which have caused the disadvantages of this process.
[0004] The simple aeration process used in the water quality recovery system of the existing seawater desulfurization process is greatly affected by the pH value, and the oxidation rate can only be faster under the condition of pH>5.0, and hydrogen ions are generated during the oxidation process, acidic Enhancement will hinder the occurrence of the reaction, so the aeration tank needs to be mixed with a large amount of fresh seawater to adjust the pH value, resulting in high energy consumption for aeration, long hydraulic retention time, large area of ​​the aeration tank, and high infrastructure costs.

Method used

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  • A desulfurization tower packing for seawater desulfurization and preparation method thereof
  • A desulfurization tower packing for seawater desulfurization and preparation method thereof
  • A desulfurization tower packing for seawater desulfurization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: The size is Φ30cm, the height is 2m, and the effective volume is 0.5m 3 In the small test device of desulfurization tower, the filling occupies 0.48m 3 Desulfurization tower packing 1# for seawater desulfurization. When preparing 1# packing, add impregnating liquid and sulfuric acid acid-washed porous Raschig ring to the stainless steel reaction kettle. The porous Raschig ring has a size of 2cm×2cm and its composition is SiO 2 , the impregnating solution contains ferrous sulfate 0.02mol / L, manganese sulfate 1.0mol / L, sulfuric acid 0.05mol / L, contains 4% of thermal precipitant, and the components of thermal precipitant are urea and ammonium acetate. The ratio is 1:5, stir, adjust the pH value to 5.0 with sulfuric acid, heat to 40°C, stir at a constant temperature for 24 hours, then heat to 96°C, stir at a constant temperature, precipitate and impregnate for 36 hours, wash with water until the effluent is colorless, and calcined at 500°C 5h. The inlet flue ga...

Embodiment 2

[0024] Example 2: The size is Φ30cm, the height is 2m, and the effective volume is 0.5m 3 In the small test device of desulfurization tower, the filling occupies 0.48m 3 Desulfurization tower packing 2# for seawater desulfurization. When preparing 2# packing, add impregnating liquid and sulfuric acid acid-washed porous Raschig ring to the stainless steel reaction kettle. The porous Raschig ring is 2cm×2cm in size and the composition is SiO 2, the impregnation solution contains 0.1mol / L of ferrous sulfate, 1.0mol / L of manganese sulfate, 0.02mol / L of sulfuric acid, and contains 4.5% of thermal precipitant. The components of thermal precipitant are urea, ammonium bicarbonate and ammonium acetate. The mass ratio of Raschig ring is 1:5, stir, adjust the pH value to 5.0 with sulfuric acid, heat to 40°C, stir at constant temperature for 12h, then heat to 96°C, stir at constant temperature, precipitate and impregnate for 40h, wash with water until the effluent is colorless, in Calcin...

Embodiment 3

[0025] Example 3: The size is Φ80cm, the height is 3m, and the effective volume is 5.5m 3 In the pilot plant of the desulfurization tower, the filling takes up 5m 3 Desulfurization tower packing 3# for seawater desulfurization. When preparing 3# packing, add impregnating liquid and sulfuric acid acid-washed porous Raschig rings into the stainless steel reaction kettle. The porous Raschig rings are 4cm×4cm in size and composed of SiO 2 , the impregnation solution contains 0.2mol / L of ferrous sulfate, 1.0mol / L of manganese sulfate, 0.01mol / L of sulfuric acid, contains 4.5% of thermal precipitant, the composition of thermal precipitant is urea, and the mass ratio of impregnation solution to porous Raschig ring is 1:4, stir, adjust the pH value to 5.0 with sulfuric acid, heat to 40°C, stir at constant temperature for 18h, then heat to 98°C, stir at constant temperature, precipitate and impregnate for 28h, wash with water until the effluent is colorless, and calcinate at 450°C for ...

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Abstract

The invention discloses a novel desulfurizer packing material for seawater desulfurization and a preparation method thereof. The novel desulfurizer packing material for seawater desulfurization is prepared through the following steps of: adding a steeping liquor and porous Raschig ring washed by sulfuric acid into a stainless steel reaction kettle, wherein mass ratio of the steeping liquor to the Raschig ring is at 1:(10-1):1; stirring, regulating pH value to 3.0-5.0 through sulfuric acid, heating to 25-60 DEG C, stirring for 12-36 hours at constant temperature, heating to 85-100 DEG C, stirring, depositing and steeping at constant temperature for 24-48 hours, washing by water until discharged water is colorless, and calcining for 3-5 hours at 400-800 DEG C to obtain the novel desulfurizer packing material for seawater desulfurization. The method is simple and materials are cheap and easily available, and the defects of the conventional seawater desulfurization process which is incomplete in sulfite radicle oxidization of seawater absorbing liquid, large occupied room of aerator, high energy consumption and the like are overcome; and the novel desulfurizer packing material realizes coupling of absorption and oxidization in a desulfurization packing tower, and is environmental-friendly and economical.

Description

technical field [0001] The invention relates to flue gas desulfurization tower packing, in particular to a desulfurization tower packing used for seawater desulfurization and a preparation method thereof. Background technique [0002] Seawater coal-fired flue gas desulfurization is suitable for thermal power plants along the coast of my country. The natural characteristics of seawater are: pH=7.8~8.3, which has the ability to neutralize hydrogen ions; the natural alkalinity is 1.2~2.5mmol / L, contains a certain amount of carbonate and bicarbonate, and has a greater resistance to pH Buffer capacity for value changes; SO 4 2- It is the basic substance of seawater and the source and sink of the natural cycle of sulfur. The principle of seawater desulfurization is to use the alkaline substance HCO naturally contained in seawater 3 - to absorb SO in the flue gas 2 . The average salinity of seawater is 3.5%, with high ionic strength. In the desulfurization process of seawat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/50B01J23/889
Inventor 雷乐成兰天杨彬朱京科李中坚
Owner ZHEJIANG UNIV
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