CN112973188A - System for deeply treating slurry foaming of desulfurization absorption tower - Google Patents
System for deeply treating slurry foaming of desulfurization absorption tower Download PDFInfo
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- CN112973188A CN112973188A CN202110316060.4A CN202110316060A CN112973188A CN 112973188 A CN112973188 A CN 112973188A CN 202110316060 A CN202110316060 A CN 202110316060A CN 112973188 A CN112973188 A CN 112973188A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D15/00—Separating processes involving the treatment of liquids with solid sorbents; Apparatus therefor
- B01D15/08—Selective adsorption, e.g. chromatography
- B01D15/10—Selective adsorption, e.g. chromatography characterised by constructional or operational features
- B01D15/20—Selective adsorption, e.g. chromatography characterised by constructional or operational features relating to the conditioning of the sorbent material
- B01D15/203—Equilibration or regeneration
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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
- 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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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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Abstract
The invention discloses a system for deeply treating slurry foaming of a desulfurization absorption tower, which comprises a feeding bin, wherein the bottom of the feeding bin is connected with the upper part of a fixed bed adsorber, an adsorbent is filled in the fixed bed adsorber, the lower part of the fixed bed adsorber is connected with a swirler through an adsorbent flushing water pipe, the fixed bed adsorber is connected with a thermal desorption tank through a discharge pipe, a stop valve is arranged on the discharge pipe, and the thermal desorption tank is connected with the feeding bin through a solid conveying device; the other side of the upper part of the fixed bed adsorber, which is opposite to the feeding bin, is connected with an adsorbent flushing water pipe; the two ends of the fixed bed adsorber are respectively connected with an absorption tower slurry outlet and a slurry inlet through pipelines. The invention discloses a system for deeply treating slurry foaming of a desulfurization absorption tower, which solves the problem that slurry foaming is caused by overhigh COD (chemical oxygen demand) of slurry due to continuous accumulation and difficult elimination of organic matters in the slurry of the desulfurization absorption tower in the prior art.
Description
Technical Field
The invention belongs to the technical field of limestone-gypsum wet desulphurization, and particularly relates to a system for deeply treating slurry foaming of a desulphurization absorption tower.
Background
Limestone-gypsum wet flue gas desulfurization is a main means for controlling the sulfur dioxide emission limit value of a coal-fired power plant, and has the characteristics of mature removal process, high efficiency, strong adjustability and the like. However, with the long-term operation of the limestone-gypsum wet flue gas desulfurization system, the quality of the slurry in the desulfurization absorption tower is deteriorated, so that the problem of slurry foaming and overflowing is caused, and the normal operation of the desulfurization system is seriously influenced. In order to control the slurry foaming phenomenon, the traditional method is to add some liquid antifoaming agents into the slurry in the absorption tower, although the slurry foaming can be relieved in the initial foaming stage, a large amount of organic substances are accumulated in the slurry in the absorption tower along with the continuous addition of the antifoaming agents, so that the COD of the slurry is high; at the same time, the effect of adding the antifoaming agent becomes worse, and finally the slurry in the absorption tower is irreversibly deteriorated, so that it is difficult to fundamentally suppress the foaming tendency of the slurry.
At present, the treatment of slurry foaming has great limitation, the content of organic substances in the slurry is difficult to reduce, and the slurry foaming is fundamentally eliminated. Research shows that slurry foaming is easy to occur when COD in slurry of the absorption tower is within the range of 300-600 mg/L. Therefore, an effective method is urgently needed, which treats the foam generated in the slurry by reducing the content of organic substances in the slurry of the absorption tower, and avoids the hidden trouble of slurry foaming caused by accumulation of organic substances in the slurry of the absorption tower due to excessive use of additives such as a defoaming agent and the like.
Disclosure of Invention
The invention aims to provide a system for deeply treating slurry foaming of a desulfurization absorption tower, which solves the problem that slurry foaming is caused by overhigh COD (chemical oxygen demand) of slurry caused by continuous accumulation and difficult elimination of organic matters in the slurry of the desulfurization absorption tower in the prior art.
The technical scheme adopted by the invention is that the system for deeply treating slurry foaming of the desulfurization absorption tower comprises a feeding bin, wherein the bottom of the feeding bin is connected with the upper part of a fixed bed adsorber, an adsorbent is filled in the fixed bed adsorber, the lower part of the fixed bed adsorber is connected with a swirler through an adsorbent flushing water pipe, the fixed bed adsorber is connected with a thermal desorption tank through a discharge pipe, a stop valve is arranged on the discharge pipe, and the thermal desorption tank is connected with the feeding bin through a solid conveying device;
the other side of the upper part of the fixed bed adsorber, which is opposite to the feeding bin, is connected with an adsorbent flushing water pipe; the two ends of the fixed bed adsorber are respectively connected with an absorption tower slurry outlet and a slurry inlet through pipelines.
The invention is also characterized in that:
the thermal desorption tank is positioned below the side of the fixed bed adsorber; the thermal desorption tank is internally provided with an adsorbent, the annular space in the thermal desorption tank is an air chamber, the lower part of the thermal desorption tank is connected with a hot air inlet pipeline, and the upper part of the air chamber is connected with a hot air outlet pipeline and is connected to a boiler.
The discharge pipe is an inclined pipe.
One end of an adsorbent flushing water pipe connected with the lower part of the fixed bed adsorber is provided with a filter screen.
The solid conveying device is a bucket elevator or a screw feeder.
One end of the solid conveying device is connected with the bottom of the thermal desorption tank, and the other end of the solid conveying device is connected with the top of the feeding bin.
The adsorbent is any one, any two or three of expanded graphite, fly ash molding particles and high oil absorption resin.
The invention has the beneficial effects that:
according to the system for deeply treating the slurry foaming of the desulfurization absorption tower, organic substances in the slurry of the desulfurization absorption tower are removed through an efficient adsorbent bed, the COD index of the absorption tower is reduced, and the slurry foaming of the absorption tower is treated; the system for deeply treating slurry foaming of the desulfurization absorption tower disclosed by the invention can avoid the hidden danger of slurry foaming caused by accumulation of organic matters in the slurry of the absorption tower due to excessive use of additives such as a defoaming agent and the like; the invention discloses a system for deeply treating slurry foaming of a desulfurization absorption tower, which solves the problem that slurry foaming is caused by overhigh COD (chemical oxygen demand) of the slurry due to continuous accumulation and difficult elimination of organic matters in the slurry of the desulfurization absorption tower.
Drawings
FIG. 1 is a schematic diagram of a system for deeply treating slurry foaming in a desulfurization absorption tower according to the present invention.
In the figure, 1 is a fixed bed adsorber, 2 is a feeding bin, 3 is a thermal desorption tank, 4 is a cyclone, 5 is an adsorbent, 6 is a solid conveying device, 7 is a discharging pipe, 8 is an air chamber, and 9 is a filter screen.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the system for deeply treating slurry foaming of a desulfurization absorption tower comprises a feeding bin 2, wherein the bottom of the feeding bin 2 is connected with the upper part of a fixed bed adsorber 1, an adsorbent 5 is filled in the fixed bed adsorber 1, the lower part of the fixed bed adsorber 1 is connected with a cyclone 4 through an adsorbent flushing water pipe, the fixed bed adsorber 1 is connected with a thermal desorption tank 3 through a discharge pipe 7, a stop valve is arranged on the discharge pipe 7, and the thermal desorption tank 3 is connected with the feeding bin 2 through a solid conveying device 6;
the other side of the upper part of the fixed bed adsorber 1, which is opposite to the feeding bin 2, is connected with an adsorbent flushing water pipe; the two ends of the fixed bed adsorber 1 are respectively connected with an absorption tower slurry outlet and a slurry inlet through pipelines.
Preferably, the thermal desorption tank 3 is located below the side of the fixed bed adsorber 1; the thermal desorption jar 3 is equipped with adsorbent 5 in, and the annular space in the thermal desorption jar 3 is air chamber 8, and the lower part of thermal desorption jar 3 links to each other with hot-blast entry pipeline, and 8 upper portions of air chamber link to each other with hot-blast export pipeline, and are connected to the boiler.
The adsorbent 5 is positioned in the middle of the thermal desorption tank 3.
Preferably, the discharge pipe 7 is an inclined pipe.
Preferably, the end of the adsorbent flushing water pipe connected with the lower part of the fixed bed adsorber 1 is provided with a filter screen 9.
Preferably, the solids conveying device 6 is a bucket elevator or screw feeder.
Preferably, one end of the solid conveying device 6 is connected with the bottom of the thermal desorption tank 3, and the other end is connected with the top of the feeding bin 2.
Preferably, the adsorbent 5 is any one, any two or three of expanded graphite, fly ash molded particles and high oil absorption resin. The particle size of the adsorbent 5 is 5 to 50 mm.
The invention relates to a system for deeply treating slurry foaming of a desulfurization absorption tower, which has the working principle that:
the fixed bed adsorber 1 is used for adsorbing organic substances in slurry; the feeding bin 2 is positioned right above the fixed bed adsorber 1 and is used for filling the adsorbent 5 into the fixed bed adsorber 1; the thermal desorption tank 3 is used for thermal desorption regeneration of the adsorbent 5; the bottom of an air chamber 8 of the thermal desorption tank 3 is connected with a hot air inlet pipeline, the upper part of the air chamber 8 is connected with a hot air outlet pipeline, hot air is sent into the thermal desorption tank 3 from the bottom of the air chamber 8 and is in direct contact with the adsorbent 5 for heating the adsorbent 5, so that organic substances in the adsorbent 5 are separated by the hot air, the thermal desorption regeneration of the adsorbent 5 is realized, and meanwhile, the hot air is sent to a boiler for combustion; wherein the temperature of the hot air is determined according to the type of the adsorbent 5; the cyclone 4 is positioned below the fixed bed adsorber 1 and is used for solid-liquid separation of the wastewater; the bottom flow of the cyclone 4 is conveyed to a dewatering belt conveyor for dewatering, and the top flow is conveyed to a wastewater treatment system for treatment.
In the actual operation process, the slurry of the absorption tower is sent to the inlet of the fixed bed adsorber 1 by the slurry circulating pump, flows through the bed layer of the adsorbent 5, a large amount of organic substances are adsorbed on the adsorbent 5, and the treated slurry flows out from the outlet of the fixed bed adsorber 1 and returns to the absorption tower, so that the adsorption of the organic substances in the slurry and the reduction of COD are realized. Adsorbent 5 is added from feed bin 2 to fixed bed adsorber 1. When the adsorbent 5 is regenerated, isolating the slurry of the absorption tower, washing the fixed bed adsorber 1 by using adsorbent washing water, washing the slurry on the surface of the adsorbent 5, sending the washing water into the cyclone 4, directly sending the bottom flow of the cyclone 4 into a dewatering belt conveyor, and sending the top flow into a wastewater treatment system. And opening the stop valve, and communicating the discharge pipe 7 between the bottom of the fixed bed adsorber 1 and the thermal desorption tank 3 to enable the adsorbent particles to be poured into the middle of the thermal desorption tank 3. And then, closing the stop valve, closing the discharge pipe 7, introducing hot air into the air chamber 8 of the thermal desorption tank 3, directly contacting the adsorbent 5, raising the temperature of the adsorbent 5, removing the organic substances from the inner surface and the outer surface of the adsorbent 5, taking the organic substances out by the hot air and delivering the organic substances to a boiler for combustion, and completing thermal desorption regeneration of the adsorbent 5. After the regeneration of the adsorbent 5 is completed, the adsorbent is conveyed to the feeding bin 2 by the solid conveying device 6 for standby.
The invention relates to a system for deeply treating slurry foaming of a desulfurization absorption tower, which has the advantages that:
the system for deeply treating slurry foaming of the desulfurization absorption tower can effectively treat organic substances in slurry of the absorption tower in limestone-gypsum wet desulfurization, reduce COD (chemical oxygen demand) of the slurry, fundamentally avoid slurry foaming hidden troubles caused by accumulation of organic substances in the slurry of the absorption tower or excessive addition of a defoaming agent in the long-term operation process of the desulfurization system, and ensure high-efficiency and stable operation of the desulfurization system.
Claims (7)
1. The system for deeply treating slurry foaming of the desulfurization absorption tower is characterized by comprising a feeding bin (2), wherein the bottom of the feeding bin (2) is connected with the upper part of a fixed bed adsorber (1), an adsorbent (5) is filled in the fixed bed adsorber (1), the lower part of the fixed bed adsorber (1) is connected with a cyclone (4) through an adsorbent flushing water pipe, the fixed bed adsorber (1) is connected with a thermal desorption tank (3) through a discharge pipe (7), the discharge pipe (7) is provided with a stop valve, and the thermal desorption tank (3) is connected with the feeding bin (2) through a solid conveying device (6);
the other side of the upper part of the fixed bed adsorber (1) opposite to the feeding bin (2) is connected with an adsorbent flushing water pipe; and two ends of the fixed bed adsorber (1) are respectively connected with an absorption tower slurry outlet and a slurry inlet through pipelines.
2. The system for deeply treating the slurry bubbling of the desulfurization absorption tower according to claim 1, wherein the thermal desorption tank (3) is positioned below the side of the fixed bed adsorber (1); adsorbent (5) are equipped with in thermal desorption jar (3), the annular space in thermal desorption jar (3) is air chamber (8), the lower part and the hot-blast inlet pipeline of thermal desorption jar (3) link to each other, air chamber (8) upper portion links to each other with hot-blast outlet pipeline, and is connected to the boiler.
3. A system for deeply remediating the slurry foaming of a desulfurization absorption tower as recited in claim 1, wherein said discharge pipe (7) is an inclined pipe.
4. The system for deeply treating slurry foaming of a desulfurization absorption tower according to claim 1, wherein one end of the adsorbent flushing water pipe connected with the lower part of the fixed bed adsorber (1) is provided with a filter screen (9).
5. The system for deeply treating the slurry foaming of the desulfurization absorption tower according to claim 1, wherein the solid conveying device (6) is a bucket elevator or a screw feeder.
6. The system for deeply treating the slurry foaming of the desulfurization absorption tower according to claim 5, wherein one end of the solid conveying device (6) is connected with the bottom of the thermal desorption tank (3), and the other end is connected with the top of the feeding bin (2).
7. The system for deeply treating slurry foaming of a desulfurization absorption tower according to claim 1 or 2, wherein the adsorbent (5) is any one, any two or three of expanded graphite, fly ash molded particles and high oil absorption resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110316060.4A CN112973188A (en) | 2021-03-24 | 2021-03-24 | System for deeply treating slurry foaming of desulfurization absorption tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110316060.4A CN112973188A (en) | 2021-03-24 | 2021-03-24 | System for deeply treating slurry foaming of desulfurization absorption tower |
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| CN112973188A true CN112973188A (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110316060.4A Pending CN112973188A (en) | 2021-03-24 | 2021-03-24 | System for deeply treating slurry foaming of desulfurization absorption tower |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113457447A (en) * | 2021-06-29 | 2021-10-01 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for removing COD (chemical oxygen demand) of desulfurization absorption tower slurry by wet catalytic oxidation |
-
2021
- 2021-03-24 CN CN202110316060.4A patent/CN112973188A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113457447A (en) * | 2021-06-29 | 2021-10-01 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for removing COD (chemical oxygen demand) of desulfurization absorption tower slurry by wet catalytic oxidation |
| CN113457447B (en) * | 2021-06-29 | 2023-10-17 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Method for removing COD (chemical oxygen demand) of slurry of desulfurization absorption tower by wet catalytic oxidation |
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