CN115487545A - Slurry defoaming system and method for limestone-gypsum wet flue gas desulfurization absorption tower - Google Patents
Slurry defoaming system and method for limestone-gypsum wet flue gas desulfurization absorption tower Download PDFInfo
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- CN115487545A CN115487545A CN202211337434.1A CN202211337434A CN115487545A CN 115487545 A CN115487545 A CN 115487545A CN 202211337434 A CN202211337434 A CN 202211337434A CN 115487545 A CN115487545 A CN 115487545A
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- absorption tower
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a slurry defoaming system and a slurry defoaming method for a limestone-gypsum wet flue gas desulfurization absorption tower, wherein the system comprises an absorption tower body, a defoaming box, a defoaming agent storage tank and a spraying layer; the absorption tower body is internally provided with a spraying layer and a foam suppressing liquid seal device positioned below the spraying layer, and the foam suppressing liquid seal device is provided with a plurality of through holes with sawtooth-shaped inner walls; the outlet of the defoaming agent storage tank is communicated with the inlet of the defoaming box, and the inlet of the defoaming box is communicated with the foam outlet on the side surface of the absorption tower body.
Description
Technical Field
The invention belongs to the technical field of flue gas desulfurization, and relates to a slurry defoaming system and method for a limestone-gypsum wet flue gas desulfurization absorption tower.
Background
Limestone-gypsum wet flue gas desulfurization technology is the most widely used flue gas desulfurization technology of coal-fired power plants, and an absorption tower is the core equipment in a wet flue gas desulfurization system. In a desulfurization system adopting a limestone-gypsum wet process, the slurry of an absorption tower often foams, when a large amount of bubbles appear on the liquid level of the slurry of the absorption tower and the foams exist for a long time, the slurry overflows, and even flows back to the flue at the inlet of the absorption tower in serious conditions, so that the operation safety of a booster fan is influenced or GGH (gas-gas heater) is blocked. In addition, the foaming of the slurry in the absorption tower can cause a false liquid level, so that the actual operation liquid level of the absorption tower is reduced, the volume of an actual operation slurry pool is reduced, and the gypsum quality and the desulfurization efficiency are influenced. At present, the measure for solving the foaming problem is mainly to add a large amount of antifoaming agents into the slurry of the absorption tower, and the operation cost of the agent is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for defoaming limestone-gypsum wet flue gas desulfurization absorption tower slurry, wherein the system and the method have the advantages of small defoaming agent amount added into the absorption tower slurry and low medicament operation cost.
In order to achieve the aim, the slurry defoaming system of the limestone-gypsum wet flue gas desulfurization absorption tower comprises an absorption tower body, a defoaming box, a defoaming agent storage tank and a spraying layer;
the absorption tower body is internally provided with a spraying layer and a foam suppressing liquid seal device positioned below the spraying layer, and the foam suppressing liquid seal device is provided with a plurality of through holes with sawtooth-shaped inner walls;
the outlet of the defoaming agent storage tank is communicated with the inlet of the defoaming box, and the inlet of the defoaming box is communicated with the foam outlet on the side surface of the absorption tower body.
The distance between the foam inhibition liquid seal device and the slurry pool at the bottom of the absorption tower body is 0.5m-1m.
The aperture of the through hole is 30-45 mm, and the aperture ratio of the foam suppressing liquid seal device is 30-40%.
The outlet of the slurry pool at the bottom in the absorption tower body is communicated with the inlet of the spraying layer through a slurry circulating pump.
The side of absorption tower body is provided with the flue gas entry, and the top of absorption tower body is provided with the exhanst gas outlet, and exhanst gas outlet, spraying layer, flue gas entry, presses down bubble liquid seal device and foam export distribute in proper order from the top down.
The outlet of the defoaming agent storage tank is communicated with the inlet of the defoaming box through a defoaming agent delivery pump.
The foam collecting pipe is provided with a regulating valve.
The inlet of the defoaming box is communicated with the foam outlet on the side surface of the absorption tower body through the foam collecting pipe.
The gypsum slurry absorber also comprises a gypsum slurry buffer tank, and an inlet of the gypsum slurry buffer tank is communicated with an outlet of the defoaming tank.
The method for defoaming the slurry of the limestone-gypsum wet flue gas desulfurization absorption tower comprises the following steps:
the slurry is atomized and sprayed through the spraying layer, and a liquid holding layer is formed on the foam suppressing liquid seal device after the slurry falls down;
under the working condition of daily operation, foam is eliminated through the liquid seal compression force of a liquid holding layer on the foam inhibition liquid seal device and the through holes with the inner walls in the sawtooth structures, and then the foam enters a slurry pool in the absorption tower body;
when the foam is required to be collected and discharged, the foam slurry at the top of the slurry pool is sent into a defoaming box, and then defoaming is carried out by the defoaming agent output by the defoaming agent storage tank.
The invention has the following beneficial effects:
the limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system and method provided by the invention have the advantages that during specific operation, the physical action of the foam inhibiting liquid seal device is utilized to eliminate foam, and when foam needs to be collected and discharged, the foam at the top of the slurry pool is sent into the defoaming box, so that the volume of the defoaming box is smaller, the slurry defoaming and discharging requirements can be met by using a very small amount of defoaming agent, and the system and method have the characteristics of simplicity, flexibility in operation and low cost.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of a bubble suppressing wet seal apparatus 2 of the present invention.
Wherein, 1 is an absorption tower body, 2 is a foam inhibition liquid seal device, 3 is a foam collecting pipe, 4 is an adjusting valve, 5 is a defoaming box, 6 is a gypsum slurry buffer box, 7 is a defoaming agent storage tank, 8 is a defoaming agent delivery pump, 9 is a slurry circulating pump, and 10 is a spraying layer.
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 and 2, the slurry defoaming system of a limestone-gypsum wet flue gas desulfurization absorption tower according to the present invention includes an absorption tower body 1, a foam suppressing liquid seal device 2, a foam collecting pipe 3, a defoaming box 5, a gypsum slurry buffer box 6, a defoaming agent storage tank 7, a defoaming agent delivery pump 8, a slurry circulating pump 9, and a spray layer 10;
the absorption tower comprises an absorption tower body 1, and is characterized in that a spraying layer 10 and a foam inhibition liquid seal device 2 located below the spraying layer 10 are arranged in the absorption tower body 1, wherein a flue gas inlet is formed in the side surface of the absorption tower body 1, a flue gas outlet is formed in the top of the absorption tower body 1, and a slurry pool is arranged at the bottom of the absorption tower body 1.
The inlet of the gypsum slurry buffer tank 6 is communicated with the outlet of the defoaming tank 5, the outlet of the defoaming agent storage tank 7 is communicated with the inlet of the defoaming tank 5 through a defoaming agent delivery pump 8, the inlet of the defoaming tank 5 is communicated with the foam outlet on the side surface of the absorption tower body 1 through a foam collecting pipe 3, the foam collecting pipe 3 is provided with an adjusting valve 4, and the outlet of the bottom slurry pool in the absorption tower body 1 is communicated with the inlet of the spraying layer 10 through a slurry circulating pump 9.
Wherein, the smoke outlet, the spraying layer 10, the smoke inlet, the foam inhibiting liquid sealing device 2 and the foam outlet are sequentially distributed from top to bottom.
The distance between the foam inhibition liquid seal device 2 and the top of the slurry pool is 0.5m-1m, the material of the foam inhibition liquid seal device 2 is 2205, a plurality of through holes with sawtooth-shaped inner walls are formed in the foam inhibition liquid seal device 2, the hole diameter is 30mm-45mm, and the opening rate is 30% -40%.
The method for defoaming the slurry of the limestone-gypsum wet flue gas desulfurization absorption tower comprises the following steps:
the slurry in the slurry pool is sent into a spraying layer 10 through a slurry circulating pump 9, and then is atomized and sprayed through the spraying layer 10, and a liquid holding layer is formed on the foam suppressing liquid sealing device 2 after the slurry falls down, wherein the height of the liquid holding layer is determined by the spraying amount of the slurry and the aperture ratio of the foam suppressing liquid sealing device 2.
Under the normal operating condition, the regulating valve 4 is closed, and foam is eliminated through the liquid seal compression force of the liquid holding layer on the foam inhibition liquid seal device 2 and the through hole with the inner wall in a zigzag structure.
After the operation for a period of time, when the foam is required to be collected and discharged, the adjusting valve 4 is opened, the foam slurry at the top of the slurry pool is sent into the defoaming box 5, then defoamed by the defoaming agent output by the defoaming agent storage tank 7, discharged into the gypsum slurry buffer tank 6, and further discharged out of the desulfurization system after being treated by the gypsum dehydration device and the wastewater treatment device.
The volume of the defoaming box 5 is 10-20% of the volume of the slurry in the absorption tower.
The limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system and method eliminate foam through the physical action of the foam inhibition liquid seal device 2, when the foam needs to be collected and discharged, the volume of the defoaming box 5 is smaller, the slurry defoaming and discharging requirement can be met by using a very small amount of defoaming agent, and the system has the characteristics of simplicity, flexible operation and low cost.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system is characterized by comprising an absorption tower body (1), a defoaming box (5), a defoaming agent storage tank (7) and a spraying layer (10);
a spraying layer (10) and a foam suppressing liquid seal device (2) positioned below the spraying layer (10) are arranged in the absorption tower body (1), and a plurality of through holes with sawtooth-shaped inner walls are formed in the foam suppressing liquid seal device (2);
an outlet of the defoaming agent storage tank (7) is communicated with an inlet of the defoaming box (5), and an inlet of the defoaming box (5) is communicated with a foam outlet on the side surface of the absorption tower body (1).
2. The limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system as claimed in claim 1, wherein the distance between the foam suppressing liquid seal device (2) and the slurry pool at the bottom of the absorption tower body (1) is 0.5m-1m.
3. The limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system as claimed in claim 1, wherein the aperture of the through hole is 30mm-45mm, and the aperture ratio of the foam suppressing liquid seal device (2) is 30% -40%.
4. The limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system as claimed in claim 1, characterized in that the outlet of the bottom slurry pool in the absorption tower body (1) is communicated with the inlet of the spraying layer (10) through a slurry circulating pump (9).
5. The limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system as claimed in claim 1, wherein a flue gas inlet is arranged on the side surface of the absorption tower body (1), a flue gas outlet is arranged on the top of the absorption tower body (1), and the flue gas outlet, the spraying layer (10), the flue gas inlet, the foam inhibition liquid sealing device (2) and the foam outlet are sequentially distributed from top to bottom.
6. The limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system as claimed in claim 1, wherein the outlet of the defoaming agent storage tank (7) is communicated with the inlet of the defoaming tank (5) through a defoaming agent delivery pump (8).
7. The limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system as claimed in claim 1, characterized in that a regulating valve (4) is arranged on the foam collecting pipe (3).
8. The limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system as claimed in claim 1, wherein the inlet of the defoaming box (5) is communicated with the foam outlet on the side of the absorption tower body (1) through the foam collecting pipe (3).
9. The limestone-gypsum wet flue gas desulfurization absorption tower slurry defoaming system as claimed in claim 1, further comprising a gypsum slurry buffer tank (6), wherein the inlet of the gypsum slurry buffer tank (6) is communicated with the outlet of the defoaming tank (5).
10. A method for defoaming slurry of a limestone-gypsum wet flue gas desulfurization absorption tower is characterized in that the slurry defoaming system of the limestone-gypsum wet flue gas desulfurization absorption tower based on claim 1 comprises the following steps:
the slurry is atomized and sprayed through the spraying layer (10), and a liquid holding layer is formed on the foam inhibition liquid sealing device (2) after the slurry falls down;
under the working condition of daily operation, foam is eliminated through the liquid seal compression force of a liquid holding layer on the foam inhibition liquid seal device (2) and through holes with sawtooth-shaped inner walls, and then the foam enters a slurry pool in the absorption tower body (1);
when the foam is required to be collected and discharged, the foam slurry at the top of the slurry pool is sent into a defoaming box (5), and then defoaming is carried out by a defoaming agent output by a defoaming agent storage tank (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211337434.1A CN115487545A (en) | 2022-10-28 | 2022-10-28 | Slurry defoaming system and method for limestone-gypsum wet flue gas desulfurization absorption tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211337434.1A CN115487545A (en) | 2022-10-28 | 2022-10-28 | Slurry defoaming system and method for limestone-gypsum wet flue gas desulfurization absorption tower |
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| CN115487545A true CN115487545A (en) | 2022-12-20 |
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| CN202211337434.1A Pending CN115487545A (en) | 2022-10-28 | 2022-10-28 | Slurry defoaming system and method for limestone-gypsum wet flue gas desulfurization absorption tower |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766303A (en) * | 2017-02-27 | 2017-05-31 | 南通大通宝富风机有限公司 | A kind of MVR evaporators for eliminating steam bubble |
| CN109107228A (en) * | 2017-06-26 | 2019-01-01 | 大唐环境产业集团股份有限公司 | A kind of desulfuration absorbing tower automatic defoaming device and debubbling method |
| CN214075827U (en) * | 2020-09-04 | 2021-08-31 | 大唐韩城第二发电有限责任公司 | Desulfurization absorption tower slurry foaming eliminating device |
| CN216024097U (en) * | 2021-08-12 | 2022-03-15 | 东方电气集团东方锅炉股份有限公司 | Slurry defoaming system of limestone wet desulphurization absorption tower |
| CN115178082A (en) * | 2022-07-07 | 2022-10-14 | 西安热工研究院有限公司 | Desulfurization absorption tower system and slurry foam eliminating method thereof |
-
2022
- 2022-10-28 CN CN202211337434.1A patent/CN115487545A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766303A (en) * | 2017-02-27 | 2017-05-31 | 南通大通宝富风机有限公司 | A kind of MVR evaporators for eliminating steam bubble |
| CN109107228A (en) * | 2017-06-26 | 2019-01-01 | 大唐环境产业集团股份有限公司 | A kind of desulfuration absorbing tower automatic defoaming device and debubbling method |
| CN214075827U (en) * | 2020-09-04 | 2021-08-31 | 大唐韩城第二发电有限责任公司 | Desulfurization absorption tower slurry foaming eliminating device |
| CN216024097U (en) * | 2021-08-12 | 2022-03-15 | 东方电气集团东方锅炉股份有限公司 | Slurry defoaming system of limestone wet desulphurization absorption tower |
| CN115178082A (en) * | 2022-07-07 | 2022-10-14 | 西安热工研究院有限公司 | Desulfurization absorption tower system and slurry foam eliminating method thereof |
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