CN212396137U - Demister flushing system capable of automatically adjusting water balance of desulfurizing tower - Google Patents
Demister flushing system capable of automatically adjusting water balance of desulfurizing tower Download PDFInfo
- Publication number
- CN212396137U CN212396137U CN202020639199.3U CN202020639199U CN212396137U CN 212396137 U CN212396137 U CN 212396137U CN 202020639199 U CN202020639199 U CN 202020639199U CN 212396137 U CN212396137 U CN 212396137U
- Authority
- CN
- China
- Prior art keywords
- demister
- desulfurizing tower
- flushing
- flue gas
- washing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model provides a demister flushing system for automatically adjusting water balance of a desulfurizing tower, which comprises a process water tank, the desulfurizing tower, a multi-stage demister, a flushing system, a parameter measuring device and a control system; the process water tank is connected with the multistage demister through a water pipe; the multistage demister is arranged in the desulfurizing tower, and a flue gas inlet and a flue gas outlet are respectively arranged on the desulfurizing tower; the flushing system is arranged adjacent to the multi-stage demister; the parameter measuring device is arranged on the desulfurizing tower, and the control system is electrically connected with the parameter measuring device. When guaranteeing the defroster and washing the effect, have the defroster and wash the water yield and adjust according to load and liquid level, automatically regulated water balance's advantage. On the other hand, the usability of automatic control of the equipment program is improved, and the working intensity of operators is reduced.
Description
Technical Field
The utility model belongs to the technical field of coal-fired thermal power plant's desulfurization defroster washes and specifically relates to a defroster rinse-system of automatically regulated desulfurizing tower water balance is related to.
Background
Fossil fuels such as a large amount of coal are used in a thermal power plant, and flue gas contains a large amount of acidic gases such as SO2 and SO3, which cause serious pollution to the environment and require desulfurization treatment. The wet desulphurization technology is the mainstream technology of the current gas desulphurization due to the advantages of high desulphurization efficiency, cheap and easily available raw materials and the like.
The wet desulfurization mainly adopts a limestone-gypsum method as a main method, limestone slurry is used as a desulfurizer, the desulfurization efficiency is 90-95 percent, the highest desulfurization efficiency can reach 99 percent, the desulfurization efficiency is stable, and the technology is mature and reliable. The main desulfurization process is as follows: the limestone powder is made into slurry and then is injected into a slurry pool at the lower part of the desulfurizing tower, the slurry is sprayed from top to bottom under the action of a slurry circulating pump, the slurry fully reacts with the flue gas introduced from the lower part of the desulfurizing tower, SO2 in the flue gas is absorbed and is forcibly oxidized in the slurry pool to generate hydrated calcium sulfate, and the hydrated calcium sulfate is obtained through dehydration. The flue gas carries a large amount of desulfurization slurry liquid drops after being repeatedly sprayed. The liquid drops contain gypsum, limestone and other components, which cause scaling, contamination and other phenomena in the rear flue, affect the operation safety, and cause gypsum rain and other phenomena when discharged through a chimney. Therefore, a demister, generally in the form of a baffle plate, is installed at the upper part of the desulfurization tower. The slurry droplets carried by the flue gas are separated by inertial impact against the baffle. In order to ensure the demisting efficiency, the demisters are generally arranged in 2-3 stages, flushing water is arranged between every two stages of demisters for timing flushing, and solids contained in slurry are prevented from being deposited on the demisters.
The washing nozzles of the demisters at all layers can be opened in sequence through program sequence control, the washing is automatically completed, one group of nozzles are used for washing for 60s, and the general whole washing period is completed once within 2 h. Or the operator manually operates the flushing.
At present, demister washing water comes from a process water tank, and belongs to external water supplement of a desulfurization system, and the water balance of the desulfurization system can be influenced by overlarge water consumption. At present, a demister flushing system only comprises a flushing water pump, a flushing valve and a nozzle thereof, and the quantity of water for flushing every time is fixed. The current program sequence control method is characterized in that the washing process is continuously carried out between the demisters at all layers from the lowest layer, the washing time of each spray head is fixed, the washing water quantity is fixed, but the water quantity discharged from the desulfurization system changes along with the load, so the water balance is difficult to control due to the existing solid demister washing system and the control method thereof, and the method is particularly characterized in that:
when the load is reduced, the flue gas volume is obviously reduced, the temperature is reduced, the steam which is brought out of the desulfurization system by the wet saturated flue gas is also reduced, but the sequence control program of the washing water volume still keeps the fixed washing duration, and the washing water volume still keeps the water volume required by the full load. Making water balance difficult to maintain. Meanwhile, at the time of low load, because the liquid drops carried by the flue gas are reduced, and because the flow velocity is reduced, the separation efficiency of the demister is reduced, and the size attached to the demister is less than that of the size attached to the demister during normal full-load operation, so that the washing water is excessive actually. The problem is more prominent when a large number of coal-fired units are in low-load operation for a long time at present.
When the liquid level in the desulfurizing tower is already at a higher liquid level, the liquid level is rapidly increased due to the full-load flushing, and when the liquid level is over a set liquid level value (each unit is determined according to the specification and the operation experience of the desulfurizing tower, such as 13m), the flushing program is forced to automatically stop in order to prevent slurry overflow. The normal washing flow is interrupted, and the normal washing effect can not be achieved.
Because present flushing system can't guarantee to put into automatic operation washing when high load or high liquid level, consequently operating personnel can only frequently manual operation, and the experience of operating personnel is highly relied on to the washing effect of defroster this moment, has increased the risk that the defroster blockked up and scale deposit, has increased the operating personnel work load simultaneously.
SUMMERY OF THE UTILITY MODEL
To the above problem, the utility model provides an automatically regulated desulfurizing tower water balance's defroster rinse-system when guaranteeing defroster washing effect for the defroster washes the water yield and adjusts automatically regulated water balance according to load and liquid level. Meanwhile, the usability of automatic control of the equipment program is improved, and the working intensity of operators is reduced.
The utility model provides a demister flushing system for automatically adjusting water balance of a desulfurizing tower, which comprises a process water tank, the desulfurizing tower, a multi-stage demister, a flushing system, a parameter measuring device and a control system; the process water tank is connected with the multistage demister through a water pipe; the multistage demister is arranged in the desulfurizing tower, and a flue gas inlet and a flue gas outlet are respectively arranged on the desulfurizing tower; the flushing system is arranged adjacent to the multi-stage demister; the parameter measuring device is arranged on the desulfurizing tower, and the control system is electrically connected with the parameter measuring device;
the flushing system comprises: a washing water pump, a plurality of washing valves and a plurality of nozzles; the flushing water pump is arranged on the water pipe, and the plurality of flushing valves and the plurality of nozzles are arranged on the water pipe near the multistage demister.
Preferably, the control system is a DCS controller.
Preferably, the parameter measuring device comprises a flue gas flow meter, and the flue gas flow meter is connected with the flue gas inlet.
Preferably, the parameter measuring device further comprises a liquid level meter, and the liquid level meter is positioned at the bottom of the desulfurization tower.
Preferably, the multistage mist eliminator comprises five stages.
Preferably, there are five flush valves for each stage of the demister.
Compared with the prior art, the beneficial effects of the utility model are that: a parameter measuring device and a control system are added on the basis of the original demister flushing system, so that the flushing water quantity of the demister can be adjusted according to the real-time flue gas load and the liquid level, and the water balance is automatically adjusted; meanwhile, the usability of automatic control of the equipment program is improved, and the working intensity of operators is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a demister flushing system for automatically adjusting the water balance of a desulfurizing tower according to an embodiment of the present invention;
fig. 2 is the embodiment of the utility model provides an automatic demister of adjusting desulfurizing tower water balance washes principle schematic diagram.
Description of reference numerals:
1: a process water tank; 2: a desulfurizing tower; 3: a multistage demister; 4: a DCS controller; 5: a flue gas inlet; 6: a flue gas outlet; 7: a water pump is flushed; 8: flushing the valve; 9: a nozzle; 10: a flue gas flow meter; 11: a liquid level meter.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the utility model provides a demister washing system for automatically adjusting water balance of a desulfurizing tower, which comprises a process water tank 1, a desulfurizing tower 2, a multi-stage demister 3, a washing system, a parameter measuring device and a control system; the process water tank 1 is connected with the multistage demister 3 through a water pipe; the multistage demister 3 is arranged in the desulfurizing tower 2, and the desulfurizing tower 2 is respectively provided with a flue gas inlet 5 and a flue gas outlet 6; the flushing system is arranged adjacent to the multistage demister 3; the parameter measuring device is arranged on the desulfurizing tower 2, and the control system is electrically connected with the parameter measuring device;
the flushing system comprises: a washing water pump 7, a plurality of washing valves 8 and a plurality of nozzles 9; the washing water pump 7 is arranged on the water pipe, and the plurality of washing valves 8 and the plurality of nozzles 9 are arranged on the water pipe near the multistage demister 3. Each stage of demister is provided with a matched flushing system 7, and the number of the flushing valves 8 and the nozzles 9 is multiple, so that a better cleaning effect is realized.
In a more preferred embodiment, as shown in FIG. 1, the control system is a DCS controller 4. The DCS controller 4 inputs therein control logic as shown in fig. 2.
In a more preferred embodiment, the parameter measuring means comprise a flue gas flow meter 10, the flue gas flow meter 10 being connected to the flue gas inlet 5.
In a more preferred embodiment, the parameter measuring device further comprises a liquid level meter 11, and the liquid level meter 11 is positioned at the bottom of the desulfurization tower 2.
In a more preferred embodiment, the multi-stage mist eliminator 3 comprises five stages. The stage number of the demister can be adjusted according to actual conditions.
In a more preferred embodiment, there are five flush valves 8 for each stage of demister. The number of the flushing valves can be adjusted according to actual conditions.
When the washing operation is started, the DCS controller 4 sends a washing command, a first-stage demister washing water program is automatically started, the flue gas flowmeter 10 obtains the real-time flue gas flow Q1, the flow signal is input into the DCS controller 4 to be calculated and compared with the full-load flue gas flow Q, and the load correction parameter a is obtained1，a1K 1Q 1/Q, k1 > 1, k1 are correction parameters, and are obtained through experiments according to different desulfurization units. Setting the opening time of each flushing valve 8 of the first-stage demister to be t1，t1＝60*a1(s). Assuming that K1 is 1.2 and Q1/Q is 0.6, then a1＝0.72，t143.2(s). Compare with a set of nozzle of prior art and wash 60s, the utility model discloses the time of having practiced thrift greatly, also saved the water consumption.
Opening a first flushing valve 8 of the first-stage demister, and waiting for t after the first flushing valve 8 of the first-stage demister is opened1S; when the waiting is finished, automatically opening a second flushing valve 8 of the first-stage demister; simultaneously, automatically closing a first flushing valve 8 of the first-stage demister; waiting for t after the second flushing valve 8 of the first demister is opened1S; when the waiting is finished, automatically opening a third flushing valve 8 of the first-stage demister; simultaneously, automatically closing a second flushing valve 8 of the first-stage demister; third flushing valve 8 of first-stage demisterAfter having been opened, wait for t1S; when the waiting is finished, automatically opening a fourth flushing valve 8 of the first-stage demister; simultaneously, automatically closing a third flushing valve 8 of the first-stage demister; after the fourth flushing valve 8 of the first-stage demister is opened, waiting for t1S; when the waiting is finished, automatically opening a fifth flushing valve 8 of the first-stage demister; simultaneously, automatically closing a fourth flushing valve 8 of the first-stage demister; waiting for t after the fifth flushing valve 8 of the first-stage demister is opened1S; and when the waiting is finished, automatically closing a fifth flushing valve 8 of the first-stage demister. At this time, the first-stage demister is flushed.
The liquid level meter 11 obtains real-time liquid level flow H1, liquid level signals are input to the DCS controller 4 for calculation and are compared with a high liquid level set value H to obtain a liquid level correction parameter b1，b1K2 × H1/H, k2 are correction parameters, and are obtained through experiments according to different desulfurization units. The DCS controller 4 outputs a command and sets a delay T1After the time, the second-stage demister is automatically started to wash, T1＝600*b1(s)。
And repeating the steps, and starting the second stage by the demister until the fifth stage washing procedure is completed.
Utilize the utility model discloses a defroster rinse-system can reduce the time of washing of every shower nozzle when the low-load, reduces to accomplish once to wash used washing water yield. Meanwhile, waiting time T is increased between each layer of demister washing, the time length of T is adjusted according to the liquid level in the desulfurizing tower, the washing interval between each layer of demister is increased during high liquid level, the washing period is prolonged, and the washing water quantity entering a desulfurizing system in unit time is reduced. Meanwhile, the usability of automatic control of equipment programs is improved, and the working intensity of operators is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. A demister flushing system capable of automatically adjusting the water balance of a desulfurizing tower is characterized by comprising a process water tank (1), a desulfurizing tower (2), a multi-stage demister (3), a flushing system, a parameter measuring device and a control system; the process water tank (1) is connected with the multistage demister (3) through a water pipe; the multistage demister (3) is arranged in the desulfurizing tower (2), and a flue gas inlet (5) and a flue gas outlet (6) are respectively arranged on the desulfurizing tower (2); the flushing system is arranged adjacent to the multistage demister (3); the parameter measuring device is arranged on the desulfurizing tower (2), and the control system is electrically connected with the parameter measuring device;
the flushing system comprises: a washing water pump (7), a plurality of washing valves (8) and a plurality of nozzles (9); the flushing water pump (7) is arranged on the water pipe, and the plurality of flushing valves (8) and the plurality of nozzles (9) are arranged on the water pipe near the multistage demister (3).
2. Demister flushing system for automatically adjusting the water balance of a desulfurization tower according to claim 1, characterized in that the control system is a DCS controller (4).
3. Demister flushing system for automatic adjustment of the water balance of a desulfurization tower according to claim 1, characterized in that the parameter measuring device comprises a flue gas flow meter (10), the flue gas flow meter (10) being connected with the flue gas inlet (5).
4. Demister washing system for automatically adjusting the water balance of a desulfurization tower according to claim 3, characterized in that the parameter measuring device further comprises a liquid level meter (11), and the liquid level meter (11) is located at the bottom of the desulfurization tower (2).
5. Demister washing system for automatically adjusting the water balance of a desulfurization tower according to claim 1, characterized in that the multi-stage demister (3) comprises five stages.
6. A demister flushing system for automatically adjusting the water balance of a desulfurization tower according to claim 5, wherein five flushing valves (8) are provided for each stage of demister.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020639199.3U CN212396137U (en) | 2020-04-24 | 2020-04-24 | Demister flushing system capable of automatically adjusting water balance of desulfurizing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020639199.3U CN212396137U (en) | 2020-04-24 | 2020-04-24 | Demister flushing system capable of automatically adjusting water balance of desulfurizing tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212396137U true CN212396137U (en) | 2021-01-26 |
Family
ID=74299476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020639199.3U Active CN212396137U (en) | 2020-04-24 | 2020-04-24 | Demister flushing system capable of automatically adjusting water balance of desulfurizing tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212396137U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111450622A (en) * | 2020-04-24 | 2020-07-28 | 大唐环境产业集团股份有限公司 | Demister flushing system capable of automatically adjusting water balance of desulfurization tower and control method |
-
2020
- 2020-04-24 CN CN202020639199.3U patent/CN212396137U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111450622A (en) * | 2020-04-24 | 2020-07-28 | 大唐环境产业集团股份有限公司 | Demister flushing system capable of automatically adjusting water balance of desulfurization tower and control method |
| CN111450622B (en) * | 2020-04-24 | 2024-02-09 | 大唐环境产业集团股份有限公司 | Demister flushing system capable of automatically adjusting water balance of desulfurizing tower and control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203264545U (en) | Ammonia escape preventing device used in flue gas ammonia desulphurization and denitrification process | |
| CN104226099A (en) | Efficient desulfurization single-tower double-circulation system and method | |
| CN201454402U (en) | Wet flue gas desulfurization device by taking sodium alkali as desulfurizer | |
| CN212396137U (en) | Demister flushing system capable of automatically adjusting water balance of desulfurizing tower | |
| CN106362575A (en) | Desulfurization spraying system of thermal power plant, and desulfurization control method | |
| CN104437056A (en) | Flue gas desulfurization device | |
| CN204338002U (en) | A kind of flue gas desulfur device | |
| CN209423285U (en) | A kind of desulfurization absorber tower defogger flusher | |
| CN111450622B (en) | Demister flushing system capable of automatically adjusting water balance of desulfurizing tower and control method | |
| CN111905536A (en) | Automatic control system for pH value of slurry passing through desulfurization absorption tower | |
| CN101596401A (en) | Flue gas desulfurization by easy double alkali method technology and device | |
| CN204841408U (en) | Flue gas desulfurization system | |
| CN208627006U (en) | A kind of swirl-flow devices in coal burning flue gas desulfurization tower apparatus | |
| CN208032269U (en) | A kind of absorption tower for sulfur removal technology | |
| CN204034553U (en) | Lime-gypsum method tower outer circulation desulphurization plant | |
| CN106139877A (en) | Efficient small coal-firing units gas desulfurization device | |
| CN213160199U (en) | Closed-loop control's desulfurization system | |
| CN210786824U (en) | Double-tower double-circulation wet desulphurization device with series-parallel flue | |
| CN201085987Y (en) | Bidirectional absorption column | |
| CN201578988U (en) | Double circulation double alkali method flue gas desulfurization device | |
| CN207385161U (en) | A kind of Multistage desulfuration device | |
| CN201669051U (en) | Calcium oxide base strong-alkali absorption device inside wet flue gas desulfurization tower | |
| CN108126517A (en) | A kind of hydrolysis of power plant supplies ammonia denitrating system and its control method | |
| CN211098349U (en) | Gypsum dewatering mechanism for cement kiln wet desulphurization system | |
| CN215233108U (en) | Smoke outlet spraying dust-settling device for desulfurization and denitrification |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |