CN101259366A - Oxidation method in flue gas desulfurization course - Google Patents
Oxidation method in flue gas desulfurization course Download PDFInfo
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- CN101259366A CN101259366A CNA200810084224XA CN200810084224A CN101259366A CN 101259366 A CN101259366 A CN 101259366A CN A200810084224X A CNA200810084224X A CN A200810084224XA CN 200810084224 A CN200810084224 A CN 200810084224A CN 101259366 A CN101259366 A CN 101259366A
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- flue gas
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Abstract
The invention relates to an oxidation method for flue gas desulphurization, in particular to a method for oxidizing sulphite with air in the process of sulfur dioxide flue gas desulphurization, By directly increasing the oxygen content in the flue gas directly, the method leads the sulphite generated in the process of adsorption to be contacted with oxygen immediately, thus oxidizing to be sulfate. The method is realized by the following three modes: the first one is to directly pass air into the flue gas; another one is to arrange an air delivery pipe inside adsorption equipment so as to mix the air passed with the flue gas in an absorption tower; the third one is to pass air at an outlet of absorbent with 'slurry' state under the circumstances that the gas liquid falls down with parallel current, which leads the air to mix with the 'slurry' by a gas-liquid mixing device installed. The invention can effectively increase the oxygen content in the flue gas in the case that energy consumption is little, thus improving the oxidation efficiency of sulphite.
Description
Technical field
The present invention relates to the industry environmental protection filed of flue gas purification, be specifically related to the method for oxidation in a kind of flue gas desulfurization course.
Background technology
Along with rapid development of economy, industries such as electric power, metallurgy, chemical industry and building materials produce a large amount of sulfur dioxide flue gas that contains, and enter atmosphere to pollute, and sulfur dioxide becomes one of atmosphere major pollutants.In order to eliminate sulfur dioxide pollution, people find the method for a lot of minimizing SO2 emissions through great efforts, and are wherein with the most use with wet desulphurization.What usually directly obtain during wet desulphurization is sulfur dioxide and the sulphite that the absorbent reaction that is modulated into " slurries " shape generates, and for the ease of the utilization again of desulfurization product, need become sulfate to sulfite oxidation under a lot of situations.Though contain in the flue gas of sulfur dioxide and contain a certain amount of oxygen, can play the effect that ite is oxidized to sulfate, oxygen content is lower in the flue gas after all, can not be completely oxidized to sulfate to ite, needs other supplemental oxygen.Industrial common employing is provided with storage tank at the bottom of the absorption tower, the sulphite of storing in storage tank " slurries " is with the form bubbling air of bubbling, oxidation sulphite.For example, with lime stone or lime is absorbent, when removing sulfur in smoke, be provided with the circulating slot of storing absorbent lime stone or lime and desulfurization product calcium sulfite " slurries " at the bottom of the absorption tower, blast air to circulating slot, the calcium sulfate (gypsum) that makes calcium sulfite oxidation become to be convenient to utilize again; And for example, with zinc oxide is absorbent, when removing sulfur in smoke, is provided with the circulating slot of storing absorbent zinc oxide and desulfurization product zinc sulfite " slurries " at the bottom of the absorption tower, blast air to circulating slot, the zinc sulfate that zinc sulfite is oxidized to be convenient to utilize again.
There are two defectives in the method for this form bubbling air oxidation sulphite with bubbling: " bubbling " mode mass-transfer efficiency is low, and coefficient of oxygen utilization is low, and required air quantity is big, increases the flue gas after desulfurization amount; The air that feeds will pass " slurries " layer, overcome the formed resistance of " slurries " layer, overcomes resistance and requires the expenditure of energy, and requires oxidation effectiveness good, and " slurries " layer that passes through is thick more, and resistance is big more, and it is high more to consume energy.During practical application,, the air-distribution pipe is set, opens equally distributed air outlet slit on the pipe, air can evenly be distributed on the storage tank cross section in order to reach best oxidation effectiveness; Increase " slurries " layer thickness that air passes through simultaneously as far as possible.Must cause carrying the pressure head of the air blast of air to increase like this, increase energy consumption.
Summary of the invention
Purpose of the present invention is to overcome the above-mentioned defective that exists with the method for oxidation sulphite with bubbling form bubbling air, and provides a kind of by directly improving the method with air oxidation sulphite of flue gas oxygen content.
The objective of the invention is to be achieved through the following technical solutions.
A kind of method for oxidation in the flue gas desulfurization course is used for the sweetening process of sulfur dioxide flue gas, is to adopt the oxygen content that improves in the sulfur dioxide flue gas.
Oxygen content in the described raising sulfur dioxide flue gas, adopt following three kinds of methods:
1) direct bubbling air in flue gas;
2) establish an air delivery pipe in addition in absorption equipment, the air of sending into mixes in the absorption tower with flue gas;
3) at gas and liquid flowing and under situation under, at the exit bubbling air of slurries shape absorbent, air and slurries exist
Mix in the Liqiud-gas mixing device that is provided with.
The inventive method adopts the oxygen content that directly improves flue gas, makes the sulphite that generates in absorption process, contacts with oxygen and is oxidized to sulfate immediately, can effectively improve the oxidation effectiveness of sulphite.The present invention effectively increases the content of oxygen in the flue gas under the little situation of energy consumption, thereby has improved the oxidation efficiency of sulphite.
Description of drawings
Fig. 1-1, Fig. 1-2 are the direct schematic diagram of bubbling air mode in flue gas; Wherein: the state diagram when Fig. 1-1 is the air-flow adverse current; State diagram when Fig. 1-2 is gas and liquid flowing;
Fig. 2-1, Fig. 2-2 establishes air delivery pipe, sends into the schematic diagram of air mode in absorption equipment for other; Air is sent into the schematic diagram that mixes with flue gas in the absorption tower; State diagram when wherein Fig. 2-1 is the air-flow adverse current;
State diagram when Fig. 2-2 is gas and liquid flowing;
Fig. 3 is the schematic diagram that Liqiud-gas mixing device is set, the state diagram when being gas and liquid flowing shown in the figure.
The specific embodiment
Containing the oxygen content in the sulfur dioxide flue gas, is to be determined by the technology that produces this flue gas.Usually these technologies all are to consume used airborne oxygen, and the content that produces oxygen in the flue gas is far below airborne 21%.For example: the coal-fired flue gas that produces contains oxygen to be had only about 6%.Though oxygen content is lower in the flue gas also can oxidation sulphite, effect does not reach requirement.Therefore, replenish air, improve the content of oxygen in the flue gas, can effectively improve the oxidation effectiveness of sulphite.
The mode of replenishing oxygen content in air, the raising flue gas has three kinds: a kind of is directly to bubbling air in the flue gas (shown in Fig. 1-1, Fig. 1-2); Another kind is to establish an air delivery pipe in absorption equipment in addition, and air is sent into flue gas and mixed (shown in Fig. 2-1, Fig. 2-2) in the absorption tower; Another be at gas and liquid flowing and under situation under, at " slurries " shape absorbent exit bubbling air, by the Liqiud-gas mixing device that is provided with, air mixes (as shown in Figure 3) with " slurries ".
As Figure 1-1, be direct bubbling air in flue gas, because of being in the air-flow adverse current, replenish air and flue gas and be, the input of " slurries " top from the middle part, absorption tower;
Shown in Fig. 1-2, be direct bubbling air in flue gas, when being in gas and liquid flowing, replenishing air and flue gas is to enter from the top, absorption tower.
Shown in Fig. 2-1, during the air-flow adverse current, establish air delivery pipe at the middle part, absorption tower, in the absorption tower, send into air;
Shown in Fig. 2-2, during gas and liquid flowing, to establish air delivery pipe by the absorption tower neck and replenish air, the flue gas that feeds with the top, absorption tower mixes,
As shown in Figure 3, mend into air, mend the air of going into and in the Liqiud-gas mixing device that top, absorption tower is provided with, mix with slurries in the exit of slurries shape absorbent.
Claims (2)
1. a kind of method for oxidation in the flue gas desulfurization course is used for the sweetening process of sulfur dioxide flue gas, it is characterized in that: be the oxygen content that improves in the sulfur dioxide flue gas.
2. according to a kind of method for oxidation in the described flue gas desulfurization course of claim 1, it is characterized in that: the oxygen content in the described raising sulfur dioxide flue gas, adopt following three kinds of methods:
1) direct bubbling air in flue gas;
2) establish an air delivery pipe in addition in absorption equipment, the air of sending into mixes in the absorption tower with flue gas;
3) at gas and liquid flowing and under situation under, at the exit bubbling air of slurries shape absorbent, air and slurries mix in the Liqiud-gas mixing device that is provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200810084224XA CN101259366A (en) | 2008-03-27 | 2008-03-27 | Oxidation method in flue gas desulfurization course |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA200810084224XA CN101259366A (en) | 2008-03-27 | 2008-03-27 | Oxidation method in flue gas desulfurization course |
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| CN101259366A true CN101259366A (en) | 2008-09-10 |
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| CNA200810084224XA Pending CN101259366A (en) | 2008-03-27 | 2008-03-27 | Oxidation method in flue gas desulfurization course |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102872717A (en) * | 2011-07-11 | 2013-01-16 | 中国石油化工股份有限公司 | Catalytic oxidation method of desulfurizing liquid |
| CN102872718A (en) * | 2011-07-11 | 2013-01-16 | 中国石油化工股份有限公司 | Oxidation method of wet flue gas desulfurizing liquid |
| CN103058351A (en) * | 2013-01-21 | 2013-04-24 | 青岛双瑞海洋环境工程股份有限公司 | Oxygen supply method and device suitable for ship emission seawater desulfurization |
| CN103585877A (en) * | 2013-11-28 | 2014-02-19 | 北京世能中晶能源科技有限公司 | System for preparing magnesium sulfate by using slurry obtained after flue gas desulphurization |
| CN104190239A (en) * | 2014-08-15 | 2014-12-10 | 浙江天翔环保设备有限公司 | High-efficiency desulfurization device |
| CN107684812A (en) * | 2017-09-19 | 2018-02-13 | 于维礼 | Oxidizing process in low-pressure oxidized slurries system and liquid |
-
2008
- 2008-03-27 CN CNA200810084224XA patent/CN101259366A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102872717A (en) * | 2011-07-11 | 2013-01-16 | 中国石油化工股份有限公司 | Catalytic oxidation method of desulfurizing liquid |
| CN102872718A (en) * | 2011-07-11 | 2013-01-16 | 中国石油化工股份有限公司 | Oxidation method of wet flue gas desulfurizing liquid |
| CN102872717B (en) * | 2011-07-11 | 2015-02-18 | 中国石油化工股份有限公司 | Catalytic oxidation method of desulfurizing liquid |
| CN102872718B (en) * | 2011-07-11 | 2015-02-18 | 中国石油化工股份有限公司 | Oxidation method of wet flue gas desulfurizing liquid |
| CN103058351A (en) * | 2013-01-21 | 2013-04-24 | 青岛双瑞海洋环境工程股份有限公司 | Oxygen supply method and device suitable for ship emission seawater desulfurization |
| CN103058351B (en) * | 2013-01-21 | 2014-03-05 | 青岛双瑞海洋环境工程股份有限公司 | Oxygen supply method and device suitable for ship emission seawater desulfurization |
| CN103585877A (en) * | 2013-11-28 | 2014-02-19 | 北京世能中晶能源科技有限公司 | System for preparing magnesium sulfate by using slurry obtained after flue gas desulphurization |
| CN103585877B (en) * | 2013-11-28 | 2015-09-02 | 北京世能中晶能源科技有限公司 | Flue gas desulfurization rear slurry is utilized to prepare the system of magnesium sulfate |
| CN104190239A (en) * | 2014-08-15 | 2014-12-10 | 浙江天翔环保设备有限公司 | High-efficiency desulfurization device |
| CN104190239B (en) * | 2014-08-15 | 2016-04-13 | 浙江天翔环保设备有限公司 | A kind of high effective desulphurization device |
| CN107684812A (en) * | 2017-09-19 | 2018-02-13 | 于维礼 | Oxidizing process in low-pressure oxidized slurries system and liquid |
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Open date: 20080910 |