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Oxidized form compound additive applied to limestone wet process flue gas desulfurization and preparation method thereof

A technology of wet flue gas desulfurization and composite additives, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of limited improvement of desulfurization efficiency, achieve thorough absorption, accelerated absorption, and simple and convenient preparation methods Effect

Inactive Publication Date: 2018-02-02
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compound additives studied at present only optimize the combination of existing additives, and the improvement of desulfurization efficiency is limited. Therefore, it is still necessary to develop high-efficiency additives to further improve the flue gas desulfurization efficiency of limestone.

Method used

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  • Oxidized form compound additive applied to limestone wet process flue gas desulfurization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Parts by weight of each component of the oxidized composite additive:

[0019] 85 parts of 0.5M iodine aqueous solution, 5 parts of disodium edetate, 10 parts of succinic acid, 8 parts of iron sulfate, 10 parts of calcium acetate monohydrate, and 5 parts of manganese acetate tetrahydrate.

[0020] The preparation method is: take iodine elemental substance and potassium iodide in a molar ratio of 1:4, and dissolve them in water to prepare a 0.5M iodine aqueous solution (I 3- The concentration of ion is 0.5M); According to each group, take iodine aqueous solution, disodium edetate, succinic acid, ferric sulfate, calcium acetate monohydrate, manganese acetate tetrahydrate and mix to obtain the oxidized composite additive.

[0021] The composite additive is added into the limestone slurry for use, and the amount of the additive added is 60g / L. The simulated mixed flue gas is introduced from the bottom of the absorption tower (the ratio of slurry to flue gas is 13L / m 3 ), ...

Embodiment 2

[0028] Parts by weight of each component of the oxidized composite additive:

[0029] 80 parts of 0.5M iodine aqueous solution, 10 parts of disodium edetate, 15 parts of succinic acid, 10 parts of iron sulfate, 10 parts of calcium acetate monohydrate, 5 parts of manganese acetate tetrahydrate.

[0030] The preparation method is: weigh iodine element and potassium iodide at a molar ratio of 1:4, dissolve in water to prepare a 0.5M iodine aqueous solution; weigh iodine aqueous solution, disodium ethylenediaminetetraacetic acid, succinic acid, and ferric sulfate respectively according to each group , Calcium acetate monohydrate, manganese acetate tetrahydrate mixed oxidized compound additives.

[0031] The composite additive is added into the limestone slurry for use, and the amount of the additive added is 60g / L. The simulated mixed flue gas is introduced from the bottom of the absorption tower (the ratio of slurry to flue gas is 13L / m 3 ), where N 2 is the carrier gas, O 2 ...

Embodiment 3

[0033] Parts by weight of each component of the oxidized composite additive:

[0034] 80 parts of 0.5M iodine aqueous solution, 10 parts of disodium edetate, 5 parts of succinic acid, 3 parts of iron sulfate, 15 parts of calcium acetate monohydrate, 2 parts of manganese acetate tetrahydrate.

[0035] The preparation method is as follows: Weigh elemental iodine and potassium iodide at a molar ratio of 1:4, dissolve in water to prepare a 0.5M iodine aqueous solution; weigh iodine aqueous solution, disodium ethylenediaminetetraacetic acid, calcium acetate monohydrate, Manganese acetate mixed with oxidized composite additives.

[0036] The composite additive is added into the limestone slurry for use, and the amount of the additive added is 60g / L. The simulated mixed flue gas is introduced from the bottom of the absorption tower (the ratio of slurry to flue gas is 13L / m 3 ), where N 2 is the carrier gas, O 2 Concentration is 10%, SO 2 The concentration is 1200ppm, and the sim...

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Abstract

The invention discloses an oxidized composite additive for limestone wet flue gas desulfurization and a preparation method thereof. The oxidized composite additive is mainly made of the following raw materials in parts by weight: 65-95 parts of iodine aqueous solution, succinic acid 5‑15 parts, 5‑10 parts of disodium edetate, 3‑10 parts of iron sulfate, 10‑20 parts of calcium acetate monohydrate, 2‑10 parts of manganese acetate tetrahydrate. The oxidized composite additive prepared by the invention is added to the limestone slurry, which can accelerate the absorption of SO2 gas in the limestone slurry, improve the reactivity between limestone and SO2, and improve the removal efficiency of SO2. At the same time, the preparation method of the oxidized composite additive of the present invention is simple and convenient, does not require heating and pressurization, does not require production equipment, and can be directly added to limestone slurry, which saves costs and can be popularized and applied on a large scale.

Description

technical field [0001] The invention relates to the field of wet flue gas desulfurization, in particular to an oxidized composite additive for limestone wet flue gas desulfurization and a preparation method thereof. Background technique [0002] Limestone-gypsum wet desulfurization is currently the most widely used flue gas desulfurization technology at home and abroad. In this process, the flue gas enters the absorption tower from the bottom of the absorption tower, and contacts the limestone slurry sprayed out from the top of the absorption tower in reverse. , SO in flue gas 2 CaCO 3 A chemical reaction occurs to generate calcium sulfite and calcium sulfate, thereby realizing SO in the flue gas 2 removal. Although the limestone-gypsum wet desulfurization technology is relatively mature, if the SO 2 CaCO 3 Reaction rate, increasing SO 2 removal rate, thereby increasing the SO 2 The removal rate can ensure that the desulfurization efficiency meets the target requireme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
CPCB01D53/80B01D53/502B01D2251/108B01D2251/404B01D2251/608B01D2251/70B01D2251/80B01D2251/902B01D2258/0283
Inventor 侯贵华刘怀平曹月斌崔恩田宋正华张峰姜瑞雨张勤芳
Owner YANCHENG INST OF TECH
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