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Composite absorbent for flue gas desulfurization

An absorbent and flue gas technology, applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., to achieve the effect of rich raw material sources, low viscosity, and high mass transfer coefficient

Active Publication Date: 2016-12-28
JIANGSU DAXIN ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

We absorb SO in the membrane 2 A lot of experimental research work has been done on composite absorbents, and novel and efficient composite absorbents have been proposed, which are currently used in flue gas purification of SO 2 There is no use and report in the field

Method used

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  • Composite absorbent for flue gas desulfurization
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  • Composite absorbent for flue gas desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A performance evaluation method for the application of composite absorbents for flue gas desulfurization in membrane contactors.

[0030] Operating conditions: room temperature (19-22°C), mixed gas pressure 0.11MPa, membrane mass transfer area 1.5 m 2 , the gas flow rate is 0.5-2 L / min, and the liquid flow rate is 200-500mL / min.

[0031] Such as figure 1 shown, respectively from N 2 Gas cylinder 1-1 and SO 2 After the gas in the gas cylinder 1-2 is measured by the gas quality control instrument 2, it enters the mixing and stabilizing tank 3 to form SO containing 0.1%-0.6% (volume percentage). 2 Mixed gas, the mixed gas after the air flow is stabilized enters the membrane contactor 4, and the SO in the mixed gas 2 It diffuses through the membrane pores to the other side of the membrane, is absorbed by the composite absorbent, and enters the liquid phase. The absorbed gas phase is released from the gas outlet at the other end of the membrane contactor. The absorbent i...

Embodiment 2

[0040] The composite absorbent used for flue gas desulfurization is an aqueous solution of potassium citrate / sodium citrate and ethylenediamine, the total concentration of potassium citrate / sodium citrate and ethylenediamine in the aqueous solution is 0.1~6mol / L, citric acid The molar ratio of potassium / sodium citrate to ethylenediamine is 1: (0.5~2).

[0041] The performance evaluation method in Example 1 is used for detection.

[0042] Process operating conditions: room temperature, gas phase pressure 0.11MPa, mixed gas SO 2 Content 0.1%-0.6% (volume percentage), membrane mass transfer area 1.5m 2 , gas velocity: 0.5-2L / min, liquid velocity: 200-500mL / min.

[0043] The performance evaluation results of various absorbents under various conditions are shown in Table 1.

[0044] Table 1 Performance evaluation results of composite absorbents

[0045]

[0046] The results show that the composite absorbent has high adaptability, not only suitable for low-concentration flue ...

Embodiment 3

[0048] The composite absorbent used for flue gas desulfurization is an aqueous solution of potassium citrate / sodium citrate and methoxyethylamine, and the total concentration of potassium citrate / sodium citrate and methoxyethylamine in the aqueous solution is 0.1~6mol / L, the molar ratio of potassium citrate / sodium citrate to methoxyethylamine is 1: (0.5~2).

[0049] The performance evaluation method in Example 1 is used for detection.

[0050] Process operating conditions: room temperature, gas phase pressure 0.11MPa, mixed gas SO 2 Content 0.1%-0.6% (volume percentage), membrane mass transfer area 1.5m 2 , gas velocity: 0.5-2L / min, liquid velocity: 200-500mL / min.

[0051] The performance evaluation results of various absorbents under various conditions are shown in Table 2.

[0052] Table 2 Composite absorbent performance evaluation results

[0053]

[0054] The results show that the composite absorbent has high adaptability, not only suitable for low-concentration fl...

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Abstract

The invention relates to the field of liquid-gas separation, especially to the field of flue gas desulphurization, specifically to a composite absorbent used for flue gas desulphurization. The objective of the invention is to provide a sulfur dioxide absorbent used for absorption of a membrane contactor. The composite absorbent used for flue gas desulphurization is composed of citrate and an aqueous solution of organic amine mixed according to a mol ratio of 1: 0.5-2. The composite absorbent has the advantages of good chemical stability, small foamability, small viscosity and a wide source, easy purchasing and a low price of raw materials. A desulphurization process using the composite absorbent has the advantages of a high mass transfer coefficient, no disturbance during flowing of gas and liquid, small mass transfer resistance, a high desulfurization rate, convenience in operation, great operational flexibility, no secondary pollution and stable running in the membrane contactor.

Description

technical field [0001] The invention relates to the field of liquid-gas separation, in particular to the field of flue gas desulfurization, and more specifically to a composite absorbent for flue gas desulfurization. Background technique [0002] SO in the flue gas of coal-fired power plants and metallurgical industries 2 It is one of the main pollutants in the atmosphere and the source of acid rain. With the increasing requirements of environmental protection on the emission of air pollutants, in the flue gas desulfurization purification, how to reasonably select the desulfurization process to achieve SO 2 Emissions in line with the national emission standards is a key issue for the healthy development of flue gas desulfurization in coal-fired power plants and metallurgical industries. Therefore, various high-performance SO 2 The development of absorbents is one of the research topics in this field. In recent years, composite absorbents have become a hot topic in the res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
Inventor 陆建刚陆春婷陈悦张慧许正文
Owner JIANGSU DAXIN ENVIRONMENTAL SCI & TECH
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