CN113413735A - Demister washing water recycling system and method - Google Patents
Demister washing water recycling system and method Download PDFInfo
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- CN113413735A CN113413735A CN202110876084.5A CN202110876084A CN113413735A CN 113413735 A CN113413735 A CN 113413735A CN 202110876084 A CN202110876084 A CN 202110876084A CN 113413735 A CN113413735 A CN 113413735A
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- demister
- water
- water tank
- tank
- reuse
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/04—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia
- B01D45/08—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising inertia by impingement against baffle separators
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/30—Relating to industrial water supply, e.g. used for cooling
Abstract
The invention discloses a system and a method for recycling demister flushing water, wherein an outlet of a demister flushing water tank is communicated with an inlet of a demister flushing water pump, an outlet of a reuse water tank is communicated with an inlet of the reuse water pump, an outlet of the reuse water pump and an outlet of the demister flushing water pump are communicated with one end of a clarification water tank flushing water valve and a demister flushing water pipe through a pipeline after being connected in parallel, the other end of the clarification water tank flushing water valve is communicated with a clarification water tank, a top opening of a demister flushing water collecting tank is opposite to the lower end of a demister, a bottom outlet of the demister flushing water collecting tank is communicated with one end of a collecting tank drain pipe, and the other end of the collecting tank drain pipe is inserted into the clarification water tank; the top of the clear water tank is provided with a clear water tank cofferdam overflow trough, and the outlet of the clear water tank cofferdam overflow trough is communicated with a reuse water tank.
Description
Technical Field
The invention belongs to the technical field of water saving, and relates to a system and a method for recycling flushing water of a demister.
Background
High-efficient ridge formula defroster of desulfurization absorption tower general configuration, but the ultralow back of discharging transformation, desulfurization system water balance is difficult to guarantee, can only reduce the frequency of washing of the biggest equipment defroster of desulfurization system water consumption to cause the defroster to block up, the condition such as collapsing frequently happens, seriously threatens unit safe operation. Therefore, the circulating utilization technology of the washing water of the demister in the absorption tower needs to be developed, the washing frequency of the demister is increased, even the demister is continuously washed, the water balance problem of a desulfurization system is thoroughly solved, the demister can efficiently and stably operate, and the water consumption of a unit is realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for recycling washing water of a demister, which can realize the recycling of the washing water of the demister in an absorption tower and reduce water consumption.
In order to achieve the aim, the demister flushing water recycling system comprises a demister flushing water tank, a clarified water tank, a reuse water tank, a demister flushing water collecting tank, a collecting tank drain pipe, a reuse water pump and a demister flushing water pipe;
the outlet of the demister flushing water tank is communicated with the inlet of a demister flushing water pump, the outlet of the reuse water tank is communicated with the inlet of the reuse water pump, the outlet of the reuse water pump and the outlet of the demister flushing water pump are communicated with one end of a clarifying water tank flushing water valve and a demister flushing water pipe after being communicated through a pipeline and a pipe, the other end of the clarifying water tank flushing water valve is communicated with the clarifying water tank, the top opening of a demister flushing water collecting tank is opposite to the lower end of a demister, the bottom outlet of the demister flushing water collecting tank is communicated with one end of a collecting tank drain pipe, and the other end of the collecting tank drain pipe is inserted into the clarifying water tank;
the top of the clear water tank is provided with a clear water tank cofferdam overflow trough, and the outlet of the clear water tank cofferdam overflow trough is communicated with the reuse water tank.
The outlet of the reuse water pump is provided with a reuse water shutoff valve.
And a demister washing water shutoff valve is arranged at the outlet of the demister washing water pump.
The bottom outlet of the clarified water tank is divided into two paths, wherein one path is communicated with a bottom flow pump of the clarified water tank, and the other path is communicated with a drainage pit of the desulfurization island.
A bottom flow pump inlet valve of the clarified water tank is arranged between the bottom outlet of the clarified water tank and the bottom flow pump of the clarified water tank.
A clarifying water tank emptying valve is arranged between the bottom outlet of the clarifying water tank and the desulfurization island drainage pit.
A reuse water tank stirrer and a reuse water tank liquid level meter are arranged in the reuse water tank.
The outlet of the clear water tank cofferdam overflow groove is communicated with the reuse water tank through an overflow water pipe.
A method for recycling washing water of a demister of a desulfurization absorption tower comprises the following steps:
opening a flushing water valve of the clarification water tank, injecting water into the clarification water tank through a demister flushing water pump until the liquid level in the clarification water tank is higher than the design liquid level, and then closing the flushing water valve of the clarification water tank;
opening a demister washing water pump, and discontinuously washing the demister;
flushing water after the demister is flushed passes through the inclined blade gap of the demister, is guided to a demister flushing water collecting water tank and automatically flows into a clarifying water tank;
when the clear water tank reaches the highest liquid level, overflowing to the reuse water tank through a clear water tank cofferdam overflow trough;
and closing the demister washing water pump, opening the reuse water pump, and starting to wash the demister by using reuse water.
The invention has the following beneficial effects:
when the system and the method for recycling the flushing water of the demister are specifically operated, water is injected into the clarifying water tank through the demister flushing water pump until the liquid level in the clarifying water tank is higher than a design liquid level, then the demister is flushed by the clarifying water tank, the demister flushing water is collected by the demister flushing water collecting tank and flows into the clarifying water tank, and the clarified clear water is used for circularly flushing the demister, so that the aim of recycling the flushing water of the demister is fulfilled, the problem of water balance of a desulfurization system of a unit is solved, and the water consumption is reduced.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a schematic structural diagram of an arrangement of a washing water collection tank 4 of a demister in the first embodiment;
fig. 3 is a schematic structural view of the arrangement of a washing water collection tank 4 of a demister in the second embodiment.
Wherein, 1 is a demister flushing water tank, 2 is a clear water tank, 3 is a reuse water tank, 4 is a demister flushing water collection tank, 5 is a collection tank drain pipe, 6 is a demister flushing water pump, 7 is a demister flushing water shutoff valve, 8 is a clear water tank flushing water valve, 9 is a clear water tank cofferdam overflow trough, 10 is a clear water tank underflow pump, 11 is a clear water tank underflow pump inlet valve, 12 is a clear water tank emptying valve, 13 is a desulfurization island drainage pit, 14 is an overflow water pipe, 15 is a reuse water tank stirrer, 16 is a reuse water tank liquidometer, 17 is a reuse water pump, 18 is a reuse water shutoff valve, 19 is a demister support beam, 20 is a demister, and 21 is a demister flushing water pipe.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the demister washing water recycling system according to the present invention includes a demister washing water tank 1, a clarifying water tank 2, a reuse water tank 3, a demister washing water collection tank 4, and a collection tank drain pipe 5;
the outlet of the demister flushing water tank 1 is communicated with the inlet of a demister flushing water pump 6, the outlet of the reuse water tank 3 is communicated with the inlet of a reuse water pump 17, the outlet of the reuse water pump 17 and the outlet of the demister flushing water pump 6 are communicated with one end of a clarifying water tank flushing water valve 8 and a demister flushing water pipe 21 after being combined by a pipeline, a reuse water shut-off valve 18 is arranged at the outlet of the reuse water pump 17, a demister flushing water shut-off valve 7 is arranged at the outlet of the demister flushing water pump 6, the other end of the clarifying water tank flushing water valve 8 is communicated with a clarifying water tank 2, the top opening of a demister flushing water collecting tank 4 is just opposite to the lower end of a demister 20, the bottom outlet of the demister flushing water collecting tank 4 is communicated with one end of a collecting tank drain pipe 5, and the other end of the collecting tank drain pipe 5 is inserted into the clarifying water tank 2;
the top of the clear water tank 2 is provided with a clear water tank cofferdam overflow trough 9, and the outlet of the clear water tank cofferdam overflow trough 9 is communicated with the reuse water tank 3 through an overflow water pipe 14.
The bottom outlet of the clarified water tank 2 is divided into two paths, wherein one path is communicated with a bottom flow pump 10 of the clarified water tank through an inlet valve 11 of the bottom flow pump of the clarified water tank, and the other path is communicated with a drainage pit 13 of the desulfurization island through an emptying valve 12 of the clarified water tank.
A reuse water tank stirrer 15 and a reuse water tank liquid level meter 16 are arranged in the reuse water tank 3.
The invention relates to a method for recycling washing water of a demister of a desulfurization absorption tower, which comprises the following steps:
before the system is started, the reuse water shutoff valve 18 is closed, the demister washing water shutoff valve 7 is opened, and the inlet valve 11 of the bottom flow pump of the clarifying tank and the emptying valve 12 of the clarifying tank are closed.
Opening a clear water tank flushing water valve 8, injecting water into the clear water tank 2 through a demister flushing water pump 6 until the liquid level in the clear water tank 2 is higher than a designed liquid level, and then closing the clear water tank flushing water valve 8, wherein the designed liquid level is higher than the liquid column obtained by converting the maximum flue gas pressure in the absorption tower from the lowest part of a collecting water tank drain pipe 5 inserted into the clear water tank 2;
opening a demister washing water pump 6 and discontinuously washing a demister 20;
flushing water after the demister 20 is flushed is guided to a demister flushing water collecting tank 4 through the inclined blade gap of the demister 20 and automatically flows to the clarifying water tank 2 through a collecting tank drain pipe 5, and the collecting tank drain pipe 5 is inserted below the liquid level of the clarifying water tank 2, so that a water sealing effect can be achieved, and smoke in the absorption tower is prevented from escaping to the clarifying water tank 2;
when the clear water tank 2 reaches the highest liquid level, the clear water after being cleared overflows to the reuse water tank 3 through a clear water tank cofferdam overflow trough 9 and an overflow water pipe 14;
the demister washing water pump 6 and the demister washing water shut-off valve 7 are closed, the reuse water shut-off valve 18 and the reuse water pump 17 are opened, and the demister 20 starts to be washed with reuse water.
The demister 20 is washed with recycled water in an intermittent washing manner or a continuous washing manner.
When the liquid level of the reuse water tank 3 is lower than the lowest liquid level, directly supplementing water into the reuse water tank 3 to enable the reuse water washing system to reach dynamic balance, namely starting the demister washing water pump 6, washing the demister 20 by adopting the demister 20 to replenish the washing water volume of the reuse water tank 3, and enabling the reuse water washing system to reach dynamic balance.
In addition, the inlet valve 11 of the underflow pump at the bottom of the clarified water tank needs to be opened periodically, and the pipelines and the pumps of the desulfurization system are washed by the underflow pump 10 of the clarified water tank, so that the solid content of water in the clarified water tank 2 is reduced, and the dynamic balance is achieved.
Meanwhile, the emptying valve 12 of the clarified water tank needs to be opened periodically, and the water with high solid content at the bottom of the clarified water tank 2 is emptied to the drainage pit 13 of the desulfurization island periodically, so that the solid content in the water in the clarified water tank 2 is reduced, and dynamic balance is achieved.
Example one
Referring to fig. 2, the first demister 20 and the third demister 20 are ridge-type structures and are disposed on the bottom demister support beam 19, and the second demister 20 is an inverted ridge-type structure and is disposed on the upper demister support beam 19 together with the third demister 20; the demister washing water collection tank 4 is disposed on the side or bottom of the bottom demister support beam 19.
Example two
Referring to fig. 3, the three demister layers 20 are all ridge-type structures, and are respectively arranged on the three demister support beams 19; the demister washing water collection tank 4 is disposed on the side or bottom of the bottom demister support beam 19.
The invention is mainly characterized in that:
the invention utilizes a demister washing water collecting tank 4 to collect washing water of a demister 20 to a clarified water tank 2, the clarified clear water circularly washes the demister 20, and muddy water at the bottom of the clarified water tank 2 washes a desulfurization system pipeline and a pump or is discharged to a desulfurization island drainage pit 13, so that the aim of recycling the washing water of the demister 20 is fulfilled in a simplest and feasible mode, the problem of water balance of most unit desulfurization systems is solved, and the following effects are obtained:
when the demister 20 is washed in an intermittent manner, the present invention can increase the frequency of washing the demister 20, reduce the risk of blockage of the demister 20, and reduce the overall water consumption of the desulfurization system.
When the demister 20 is flushed by adopting a continuous flushing mode, the invention thoroughly solves the blocking risk of the demister 20, reduces the overall water consumption of the desulfurization system, and can obviously reduce dust in flue gas because the flue gas is continuously washed in the process of continuously flushing the demister 20.
Claims (9)
1. A demister washing water recycling system is characterized by comprising a demister washing water tank (1), a clarifying water tank (2), a reuse water tank (3), a demister washing water collecting tank (4), a collecting tank drain pipe (5), a reuse water pump (17) and a demister washing water pipe (21);
the outlet of the demister flushing water tank (1) is communicated with the inlet of a demister flushing water pump (6), the outlet of the recycling water tank (3) is communicated with the inlet of the recycling water pump (17), the outlet of the recycling water pump (17) and the outlet of the demister flushing water pump (6) are communicated with one end of a clarifying water tank flushing water valve (8) and a demister flushing water pipe (21) after being connected in parallel through a pipeline, the other end of the clarifying water tank flushing water valve (8) is communicated with the clarifying water tank (2), the top opening of a demister flushing water collecting tank (4) is right opposite to the lower end of a demister (20), the bottom outlet of the demister flushing water collecting tank (4) is communicated with one end of a collecting tank drain pipe (5), and the other end of the collecting tank drain pipe (5) is inserted into the clarifying water tank (2);
the top of the clear water tank (2) is provided with a clear water tank cofferdam overflow trough (9), and the outlet of the clear water tank cofferdam overflow trough (9) is communicated with the reuse water tank (3).
2. Demister washing water recycling system according to claim 1, characterized in that the outlet of the reuse water pump (17) is provided with a reuse water shut-off valve (18).
3. Demister washing water recycling system according to claim 1, characterized in that the demister washing water shut-off valve (7) is provided at the outlet of the demister washing water pump (6).
4. The demister washing water recycling system according to claim 1, characterized in that the bottom outlet of the clarified water tank (2) is divided into two paths, one path is communicated with the clarified water tank bottom flow pump (10), and the other path is communicated with the desulfurization island drainage pit (13).
5. The demister washing water recycling system according to claim 4, wherein a clarified water tank underflow pump inlet valve (11) is provided between the bottom outlet of the clarified water tank (2) and the clarified water tank underflow pump (10).
6. Demister washing water recycling system according to claim 4, characterized in that a clarified water tank emptying valve (12) is arranged between the bottom outlet of the clarified water tank (2) and the desulfurization island drainage pit (13).
7. Demister washing water recycling system according to claim 1, characterized in that a reuse tank stirrer (15) and a reuse tank level meter (16) are provided in the reuse tank (3).
8. Demister washing water recycling system according to claim 1, characterized in that the outlet of the clear water tank cofferdam overflow launder (9) is in communication with the reuse water tank (3) via an overflow water pipe (14).
9. A recycling method of washing water of a demister of a desulfurization absorption tower is characterized in that the recycling system of washing water of the demister is based on claim 1, and comprises the following steps:
opening a clear water tank flushing water valve (8), injecting water into the clear water tank (2) through a demister flushing water pump (6) until the liquid level in the clear water tank (2) is higher than the designed liquid level, and then closing the clear water tank flushing water valve (8);
opening a demister washing water pump (6) and discontinuously washing the demister (20);
flushing water after washing the demister (20) is guided to a demister flushing water collecting tank (4) through inclined blade gaps of the demister (20) and flows into a clarifying tank (2) automatically;
when the clear water tank (2) reaches the highest liquid level, the clear water tank cofferdam overflow trough (9) overflows to the reuse water tank (3);
and closing the demister washing water pump (6), opening the reuse water pump (17), and starting to wash the demister (20) by using reuse water.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110876084.5A CN113413735A (en) | 2021-07-30 | 2021-07-30 | Demister washing water recycling system and method |
| PCT/CN2022/102269 WO2023005577A1 (en) | 2021-07-30 | 2022-06-29 | Flushing water recirculation system and method for mist eliminator |
| JP2022002388U JP3239131U (en) | 2021-07-30 | 2022-07-20 | Demister rinse water recycling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110876084.5A CN113413735A (en) | 2021-07-30 | 2021-07-30 | Demister washing water recycling system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113413735A true CN113413735A (en) | 2021-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110876084.5A Pending CN113413735A (en) | 2021-07-30 | 2021-07-30 | Demister washing water recycling system and method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3239131U (en) |
| CN (1) | CN113413735A (en) |
| WO (1) | WO2023005577A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023005577A1 (en) * | 2021-07-30 | 2023-02-02 | 西安西热锅炉环保工程有限公司 | Flushing water recirculation system and method for mist eliminator |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114604925A (en) * | 2022-03-29 | 2022-06-10 | 西安西热锅炉环保工程有限公司 | Energy-saving and water-saving desulfurization wastewater concentration treatment system and method |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4155977A (en) * | 1977-08-11 | 1979-05-22 | Baker Bob G | Pollution control system |
| US4452766A (en) * | 1982-08-30 | 1984-06-05 | Airpol, Inc. | Double alkali process for removal of sulfur dioxide from gas streams |
| CN102716639B (en) * | 2012-07-20 | 2014-08-20 | 中电投远达环保工程有限公司 | High-efficiency wet-type electric dust removal and desulfuration system and process |
| CN104971610B (en) * | 2015-06-26 | 2017-12-05 | 国家电投集团远达环保工程有限公司 | Flexible high-efficiency demisting dust pelletizing system and its technique |
| CN107803111A (en) * | 2017-12-07 | 2018-03-16 | 北京兴晟科技有限公司 | A kind of desulfuration absorbing tower mist eliminator flushing water system for recycling |
| CN209423285U (en) * | 2018-10-09 | 2019-09-24 | 大唐陕西发电有限公司 | A kind of desulfurization absorber tower defogger flusher |
| CN109603479A (en) * | 2018-12-29 | 2019-04-12 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | A kind of recovery and processing system for collecting desulfurizer mist eliminator flushing water |
| CN113413735A (en) * | 2021-07-30 | 2021-09-21 | 西安西热锅炉环保工程有限公司 | Demister washing water recycling system and method |
-
2021
- 2021-07-30 CN CN202110876084.5A patent/CN113413735A/en active Pending
-
2022
- 2022-06-29 WO PCT/CN2022/102269 patent/WO2023005577A1/en unknown
- 2022-07-20 JP JP2022002388U patent/JP3239131U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023005577A1 (en) * | 2021-07-30 | 2023-02-02 | 西安西热锅炉环保工程有限公司 | Flushing water recirculation system and method for mist eliminator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3239131U (en) | 2022-09-15 |
| WO2023005577A1 (en) | 2023-02-02 |
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