CN102188894A - Method and system for supplying desulphurization absorbent in flue - Google Patents
Method and system for supplying desulphurization absorbent in flue Download PDFInfo
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- CN102188894A CN102188894A CN2010101207133A CN201010120713A CN102188894A CN 102188894 A CN102188894 A CN 102188894A CN 2010101207133 A CN2010101207133 A CN 2010101207133A CN 201010120713 A CN201010120713 A CN 201010120713A CN 102188894 A CN102188894 A CN 102188894A
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- absorbent
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- desulfuration absorbing
- absorbing tower
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Abstract
The invention provides a method and system for supplying a desulphurization absorbent in a flue. The method comprises the followings steps: supplying the desulphurization absorbent for a desulphurization absorption tower by using a serous fluid supply device; obtaining the pH value of a gypsum slurry in the desulphurization absorption tower; judging whether the obtained pH value is lower than a preset minimum pH value or not; and if so, controlling a standby serous fluid supply device to supply the desulphurization absorbent to the grounded pit of the desulphurization absorption tower. When the pH value of the gypsum slurry in the absorption tower is too low due to the failure of a desulphurization absorbent supply system, the system for supplying the desulphurization absorbent in the flue provided by the invention can be used for supplying the desulphurization absorbent to the grounded pit of the desulphurization absorption tower promptly, thereby preventing SO2 in flue gas from polluting the air.
Description
Technical field
The present invention is about a kind of flue gas treatment technology, especially in regard to a kind of flue desulfurization absorbent Supply Method and system.
Background technology
Contain a large amount of sulfur dioxide in the flue gas that coal-burning boiler produces, if directly be discharged in the atmosphere, will serious environment pollution, handle so must carry out desulfurization.
Generally the no bypass flue desulfurization of employing system carries out the flue gas desulfurization processing at present, the technological process of no bypass flue desulfurization system is: boiler smoke is drawn by air-introduced machine and is entered the absorption tower, in the absorption tower, finish the sulfur dioxide in flue gas absorbing and removing, flue gas after the processing is sent into chimney (cooling tower) discharging again after demister is removed droplet.Need in the absorption tower for supplying lime stone slurry, lime stone in the gypsum slurries and SO by the slurries supply system
2Reaction becomes gypsum, thereby makes that the interior pH value stabilization of gypsum slurries within the specific limits in the absorption tower.When the slurries supply system breaks down and can not supply lime stone slurry the time, the pH value will descend, cause desulfuration efficiency to descend.
In order to address the above problem, by accident slurries case or adjacent boiler absorption tower supply lime stone slurry, still the concentration of lime stone slurry is not high in the adjacent boiler absorption tower, supply rate is slow and slurry flow is limited in the prior art.
Summary of the invention
Embodiment of the invention purpose is to provide a kind of flue desulfurization absorbent Supply Method and system, to solve because desulfurization absorbent supply system fault causes the pH value in the absorption tower to cross low and problem that can not carry out complete desulfurization to flue gas.
In order to solve the realization above-mentioned purpose, the embodiment of the invention provides a kind of flue desulfurization absorbent Supply Method, and described method comprises: adopt the slurries supply equipment to supply desulfurization absorbent in desulfuration absorbing tower; Obtain the pH value of gypsum slurries in the described desulfuration absorbing tower; Judge whether the described pH value that obtains is lower than default minimum pH value; If then control standby slurries supply equipment and in the melt pit of described desulfuration absorbing tower, supply desulfurization absorbent.
In order to solve the realization above-mentioned purpose, the embodiment of the invention also provides a kind of flue desulfurization absorbent supplying system, and described system comprises: the slurries supply equipment is used for supplying desulfurization absorbent to desulfuration absorbing tower; The pH value acquiring unit is used for obtaining the pH value of described desulfuration absorbing tower gypsum slurries; The pH value judging unit is used to judge whether the described pH value that obtains is lower than default minimum pH value; Device control cell is used for controlling standby slurries supply equipment and supplies desulfurization absorbent to the melt pit of described desulfuration absorbing tower.
The useful technique effect of the embodiment of the invention: cross when low when desulfurization absorbent supply system fault causes pH value in the absorption tower, desulfurization absorbent supply system of the present invention can in time be supplied desulfurization absorbent in the melt pit of absorption tower, prevent the SO in the flue gas
2Contaminated air.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 has the structural representation of bypass flue desulfurization system for design in the prior art;
Fig. 2 is the structure chart of embodiment of the invention flue desulfurization absorbent supplying system;
Fig. 3 is an embodiment of the invention flue desulfurization absorbent Supply Method flow chart;
Fig. 4 is the structural representation of embodiment of the invention flue desulfurization absorbent supplying system;
Fig. 5 is the structural representation of another embodiment of the present invention flue desulfurization absorbent supplying system.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 has the structural representation of bypass flue desulfurization system for design in the prior art; The flue gas that produces in the boiler enters flue collector 101, enters absorption tower 103 under the air inducing effect of air-introduced machine 102, flue gas carries out desulfurization in absorption tower 103 handle after through demister 104 go out in the flue gas (drop is discharged in the atmosphere through chimney 105 at last.Available technology adopting desulfurization absorbent supply system is carried out desulfurization to the flue gas in the absorption tower, the desulfurization absorbent supply system comprises absorbent case 106 and the transfer pump 107 that is used to deposit absorbent, and transfer pump 107 is constantly sent into the absorbent in the absorbent case 106 in the absorption tower.
Fig. 2 is the structure chart of embodiment of the invention flue desulfurization absorbent supplying system; As shown in Figure 2, described system comprises: slurries supply equipment 201 is used for supplying desulfurization absorbent to desulfuration absorbing tower.PH value acquiring unit 202 is used for obtaining the pH value of described desulfuration absorbing tower gypsum slurries.PH value judging unit 203 is used to judge whether the described pH value that obtains is lower than default minimum pH value, and default minimum pH value can be 4.5, the invention is not restricted to this.Device control cell 204 is used for controlling standby slurries supply equipment and supplies desulfurization absorbent to the melt pit of described desulfuration absorbing tower.Specifically be used to generate the device start signal, and in the melt pit of described desulfuration absorbing tower, supply desulfurization absorbent according to the standby slurries supply equipment of described device start signal controlling.
When the described pH value that obtains when described pH value judgment unit judges was higher than default the highest pH value, described device control cell generated the equipment stop signal, closes described standby slurries supply equipment.Described the highest default pH value is 5.3, the invention is not restricted to this.
Described standby slurries supply equipment comprises: the absorbent storehouse is used for the storage absorbent powder; Discharger couples with described absorbent storehouse, is used for the absorbent powder in absorbent storehouse is sent in the desulfuration absorbing tower melt pit; Water supply installation is used for supplying water to the desulfuration absorbing tower melt pit.
Described standby slurries supply equipment also comprises: auger conveyor is used for the absorbent powder that described discharger unloads is sent into the desulfuration absorbing tower melt pit.
Fig. 3 is an embodiment of the invention flue desulfurization absorbent Supply Method flow chart; As shown in Figure 3, described method comprises:
Step S301: adopt the slurries supply equipment in desulfuration absorbing tower, to supply desulfurization absorbent.
Step S302: the pH value that obtains gypsum slurries in the described desulfuration absorbing tower.
Step S303: judge whether the described pH value that obtains is lower than default minimum pH value, if carry out step S304.
Step S304: control standby slurries supply equipment and in the melt pit of described desulfuration absorbing tower, supply desulfurization absorbent.The standby slurries supply equipment of described control is supplied desulfurization absorbent and is comprised in the melt pit of described desulfuration absorbing tower: generate the device start signal; In the melt pit of described desulfuration absorbing tower, supply desulfurization absorbent according to the standby slurries supply equipment of described device start signal controlling.
Further, in step S303,, then carry out step S302, continue to obtain the pH value of gypsum slurries in the described desulfuration absorbing tower if the described pH value that obtains is higher than default minimum pH value.
The supply desulfurization absorbent is supply absorbent powder and a water in the melt pit of described desulfuration absorbing tower in the melt pit of described desulfuration absorbing tower.Absorbent powder can the invention is not restricted to this for limestone powder, lime powder or calcium hydroxide powder.
After step S304, described method comprises: the pH value that obtains gypsum slurries in the desulfuration absorbing tower; Judge whether the described pH value that obtains is higher than the highest default pH value; If control standby slurries supply equipment and stop in described desulfuration absorbing tower melt pit, supplying desulfurization absorbent.The described supply desulfurization absorbent that stops in described desulfuration absorbing tower melt pit comprises: generate the equipment stop signal; Close described standby slurries supply equipment according to described equipment stop signal.
After supplying in the desulfuration absorbing tower melt pit according to described switch open signal, described method comprises: the pH value that obtains gypsum slurries in the desulfuration absorbing tower; Judge whether the described pH value that obtains is higher than the highest default pH value; If stop in described desulfuration absorbing tower melt pit, supplying desulfurization absorbent; The described supply desulfurization absorbent that stops in described desulfuration absorbing tower melt pit comprises: generate the switch shutdown signal; Close absorbent storehouse and water supply installation according to described switch shutdown signal.
Specify embodiments of the invention below.
Fig. 4 is the structural representation of embodiment of the invention flue desulfurization absorbent supplying system; The embodiment of the invention adopts lime stone slurry as desulfurization absorbent, the invention is not restricted to this.In conjunction with Fig. 1, shown in Figure 4, flue gas enters absorption tower 401 from the smoke inlet 402 on absorption tower, and the exhanst gas outlet 403 from desulfuration absorbing tower 401 after the desulfurization enters demister 104, is discharged in the atmosphere then.Desulfuration absorbing tower 401 left sides are existing slurries supply system, form by limewash slurries case 404 and connected transfer pump 405, and two transfer pumps of limewash slurries case 404 general connections, an operation, another is standby.When the transfer pump of operation breaks down, enable standby transfer pump.
The pH value of gypsum slurries can not be lower than 4.5 in the absorption tower, if be lower than 4.5, can cause desulfurization not thorough.During lime stone slurry supply system operate as normal, the pH value of gypsum slurries generally can be stabilized in 5～5.5 the scope.But when the lime stone slurry supply system breaks down (two transfer pumps all break down), will can in the absorption tower, not supply lime stone slurry.Along with SO in the flue gas
2Constantly with the absorption tower in gypsum slurries in lime stone slurry reaction, the pH value of gypsum slurries will be lower than 4.5, if do not continue to supply lime stone slurry in desulfuration absorbing tower 401 SO in the flue gas
2Can not eliminate fully, atmosphere will be polluted, and can cause absorption tower equipment sour corrosion, reduce service life.
In order to guarantee that when the lime stone slurry supply system breaks down desulfurization is complete, the invention provides a kind of flue desulfurization absorbent supplying system, as shown in Figure 4, described system comprise the slurries supply equipment, be subjected to scattered control system (Distributed Control System DCS) control control appliance 406 and standby slurries supply equipment.Described control appliance 406 comprises the pH value acquiring unit 202 among Fig. 2, pH value judging unit 203 and device control cell 204.Standby slurries supply equipment comprises: absorbent storehouse 408, and discharger 409 and water supply installation 410, water supply installation can be feedwater piping.Control appliance 406 be connected to desulfuration absorbing tower 401, slurries supply system 404, transfer pump 405, control cabinet 407.Whether control appliance 406 can monitor transfer pump 405 and break down, and obtains the pH value of gypsum slurries in the desulfuration absorbing tower 401 in real time.When monitoring two transfer pumps 405 when all breaking down, control appliance 406 judges whether the pH value of gypsum slurries is lower than default minimum pH value (for example being 4.5), when the pH value of gypsum slurries was lower than default minimum pH value, control appliance 406 was to control cabinet 407 transmit button start signal.Control cabinet 407 is according to the standby slurries supply equipment of switch open unblanking, open trigger switch water filling in desulfuration absorbing tower melt pit 412 of water supply installation 410, the motor of opening discharger 409 is discharged to the absorbent powder in the absorbent storehouse 408 on the auger conveyor 414, and auger conveyor 414 is sent into absorbent powder in the desulfuration absorbing tower melt pit 412.In another embodiment, discharger 409 is directly sent into absorbent powder in the desulfuration absorbing tower melt pit 412, as shown in Figure 5.
Fixed in order to prevent the absorbent powder in the absorbent storehouse 408, storehouse fluidizer (not shown) can also be installed on absorbent storehouse 408.
A melt pit agitator 413 is arranged in the desulfuration absorbing tower melt pit 412, absorbent powder and water are mixed, when the flue desulfurization absorbent supplying system is supplied absorbent in desulfuration absorbing tower melt pit 412, the very fast arrival sump pump 415 of liquid level that breaks away from the absorption tower melt pit 412 starts the liquid level that need reach, and sump pump 415 is just sent into the absorbent that mixes in the desulfuration absorbing tower.
The useful technique effect of the embodiment of the invention: cross when low when desulfurization absorbent supply system fault causes pH value in the absorption tower, desulfurization absorbent supply system of the present invention can in time be supplied desulfurization absorbent in the desulfuration absorbing tower melt pit, prevent the SO in the flue gas
2Contaminated air.
The above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is the specific embodiment of the present invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of being made, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. flue desulfurization absorbent method is characterized in that described method comprises:
Adopt the slurries supply equipment in desulfuration absorbing tower, to supply desulfurization absorbent;
Obtain the pH value of gypsum slurries in the described desulfuration absorbing tower;
Judge whether the described pH value that obtains is lower than default minimum pH value;
If then control standby slurries supply equipment and in the melt pit of described desulfuration absorbing tower, supply desulfurization absorbent.
2. the method for claim 1 is characterized in that, the standby slurries supply equipment of described control is supplied desulfurization absorbent and comprised in the melt pit of described desulfuration absorbing tower:
Generate the device start signal;
In the melt pit of described desulfuration absorbing tower, supply desulfurization absorbent according to the standby slurries supply equipment of described device start signal controlling.
3. the method for claim 1, it is characterized in that, in the melt pit of described desulfuration absorbing tower, supply desulfurization absorbent according to the standby slurries supply equipment of described device start signal controlling and comprise: in the melt pit of described desulfuration absorbing tower, supply absorbent powder and water respectively according to the standby slurries supply equipment of described device start signal controlling.
4. the method for claim 1 is characterized in that, after supplying desulfurization absorbent according to the standby slurries supply equipment of described device start signal controlling in the melt pit of described desulfuration absorbing tower, described method comprises:
Obtain the pH value of gypsum slurries in the desulfuration absorbing tower;
Judge whether the described pH value that obtains is higher than the highest default pH value;
If control standby slurries supply equipment and stop in described desulfuration absorbing tower melt pit, supplying desulfurization absorbent.
5. method as claimed in claim 4 is characterized in that, the described supply desulfurization absorbent that stops in described desulfuration absorbing tower melt pit comprises:
Generation equipment stop signal;
Close described standby slurries supply equipment according to described equipment stop signal.
6. a flue desulfurization absorbent supplying system is characterized in that, described system comprises:
The slurries supply equipment is used for supplying desulfurization absorbent to desulfuration absorbing tower;
The pH value acquiring unit is used for obtaining the pH value of described desulfuration absorbing tower gypsum slurries;
The pH value judging unit is used to judge whether the described pH value that obtains is lower than default minimum pH value;
Device control cell is used for controlling standby slurries supply equipment and supplies desulfurization absorbent to the melt pit of described desulfuration absorbing tower.
7. system as claimed in claim 6, it is characterized in that, described device control cell specifically is used to generate the device start signal, and supplies desulfurization absorbent according to the standby slurries supply equipment of described device start signal controlling in the melt pit of described desulfuration absorbing tower.
8. system as claimed in claim 6 is characterized in that, described standby slurries supply system comprises:
The absorbent storehouse is used for the storage absorbent powder;
Discharger couples with described absorbent storehouse, is used for the absorbent powder in absorbent storehouse is sent in the desulfuration absorbing tower melt pit;
Water supply installation is used for supplying water to the desulfuration absorbing tower melt pit.
9. system as claimed in claim 8 is characterized in that, described standby slurries supply equipment also comprises:
Auger conveyor is used for the absorbent powder that described discharger unloads is sent into the desulfuration absorbing tower melt pit.
10. system as claimed in claim 6 is characterized in that,
When the described pH value that obtains when described pH value judgment unit judges was higher than default the highest pH value, described device control cell generated the equipment stop signal, closes described standby slurries supply equipment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010120713 CN102188894B (en) | 2010-03-08 | 2010-03-08 | Method and system for supplying desulphurization absorbent in flue |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010120713 CN102188894B (en) | 2010-03-08 | 2010-03-08 | Method and system for supplying desulphurization absorbent in flue |
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| CN102188894A true CN102188894A (en) | 2011-09-21 |
| CN102188894B CN102188894B (en) | 2013-08-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107899407A (en) * | 2017-12-25 | 2018-04-13 | 国投钦州发电有限公司 | Limestone slurry liquid supply system |
| CN111729481A (en) * | 2020-06-05 | 2020-10-02 | 浙江浩普智能科技有限公司 | Pulse control method and system for limestone slurry in wet desulphurization of coal-fired power plant |
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| US5034028A (en) * | 1988-12-02 | 1991-07-23 | Mitsubishi Jukogyo Kabushiki Kaisha | Exhaust gas treating method |
| US5770161A (en) * | 1995-04-21 | 1998-06-23 | Mitsubishi Jukogyo Kabushiki Kaisha | Flue gas treating system |
| CN1327871A (en) * | 2000-06-14 | 2001-12-26 | 王宇 | Wet dusting and desulfurizing process |
| CN1939573A (en) * | 2005-09-29 | 2007-04-04 | 陈鸣楼 | Efficient lime-gypsum wet desulfurizer |
| CN101327395A (en) * | 2008-05-16 | 2008-12-24 | 贡有成 | Sequencing batch limestone slurry wet desulfurization technique |
-
2010
- 2010-03-08 CN CN 201010120713 patent/CN102188894B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5034028A (en) * | 1988-12-02 | 1991-07-23 | Mitsubishi Jukogyo Kabushiki Kaisha | Exhaust gas treating method |
| US5770161A (en) * | 1995-04-21 | 1998-06-23 | Mitsubishi Jukogyo Kabushiki Kaisha | Flue gas treating system |
| CN1327871A (en) * | 2000-06-14 | 2001-12-26 | 王宇 | Wet dusting and desulfurizing process |
| CN1939573A (en) * | 2005-09-29 | 2007-04-04 | 陈鸣楼 | Efficient lime-gypsum wet desulfurizer |
| CN101327395A (en) * | 2008-05-16 | 2008-12-24 | 贡有成 | Sequencing batch limestone slurry wet desulfurization technique |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107899407A (en) * | 2017-12-25 | 2018-04-13 | 国投钦州发电有限公司 | Limestone slurry liquid supply system |
| CN107899407B (en) * | 2017-12-25 | 2024-04-02 | 国投钦州发电有限公司 | Limestone slurry supply system |
| CN111729481A (en) * | 2020-06-05 | 2020-10-02 | 浙江浩普智能科技有限公司 | Pulse control method and system for limestone slurry in wet desulphurization of coal-fired power plant |
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| CN102188894B (en) | 2013-08-14 |
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