CN110745927A - Coupling separation device for removing SS (suspended substance) in catalytic cracking flue gas desulfurization wastewater - Google Patents

Coupling separation device for removing SS (suspended substance) in catalytic cracking flue gas desulfurization wastewater Download PDF

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Publication number
CN110745927A
CN110745927A CN201911127358.XA CN201911127358A CN110745927A CN 110745927 A CN110745927 A CN 110745927A CN 201911127358 A CN201911127358 A CN 201911127358A CN 110745927 A CN110745927 A CN 110745927A
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CN
China
Prior art keywords
sludge
flue gas
guide cylinder
guide
catalytic cracking
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CN201911127358.XA
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Chinese (zh)
Inventor
丁海荣
王庆芬
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YIXING RONG SHENG DA ENVIRONMENTAL PROTECTION CO Ltd
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YIXING RONG SHENG DA ENVIRONMENTAL PROTECTION CO Ltd
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Priority to CN201911127358.XA priority Critical patent/CN110745927A/en
Publication of CN110745927A publication Critical patent/CN110745927A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281Installations for water purification using chemical agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/18Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents

Abstract

The invention discloses a coupling separation device for removing SS (suspended solid) in catalytic cracking flue gas desulfurization wastewater, which comprises a tank body, a two-stage reaction stirring coagulator, a guide cylinder, a guide reflection device, a mud scraper, a sludge concentration hopper and a sludge collection reflux device, wherein the two-stage reaction stirring coagulator is arranged on the outer side of the tank body and is communicated with the guide cylinder through a liquid inlet pipe, liquid, solid and medicament enter the guide cylinder after being coagulated with reflux granular sludge through stirring and coagulation, the guide reflection device is arranged below the guide cylinder, the area in the tank body around the guide cylinder and the guide reflection device is set as a clarification area, the top of the clarification area is provided with a liquid outlet pipe, the bottom of the clarification area is provided with a cone-shaped bottom plate, the sludge concentration hopper is arranged at the lower port of the bottom center of the bottom plate, the mud scraper is arranged above the periphery of the bottom plate. The invention has high solid-liquid separation efficiency and good SS removal effect, and is suitable for treating high-concentration fine particle solid-containing industrial wastewater.

Description

Coupling separation device for removing SS (suspended substance) in catalytic cracking flue gas desulfurization wastewater
Technical Field
The invention belongs to the technical field of industrial wastewater clarification and separation, and particularly relates to a coupling separation device for removing catalytic cracking flue gas desulfurization wastewater SS, which is mainly used for clarification and separation of petrochemical catalytic cracking flue gas desulfurization solid-containing wastewater with high solid content, fine particle size and difficult separation.
Background
At present, most of petrochemical catalytic cracking flue gas desulfurization devices in China adopt wet desulfurization. The wet desulphurization is the flue gas desulphurization process which is the most mature and widely applied in the prior art. The limestone/lime-gypsum wet flue gas desulfurization technology accounts for about 85% of the FGD system which is put into operation in the world, the limestone/lime-gypsum wet flue gas desulfurization technology is adopted in most of the desulfurization modes of large coal-fired power generating sets in China, and the desulfurization efficiency can generally reach more than 95%.
However, with the development of economy and society in China, the emission of smoke is on a rising trend, and the smoke becomes a prominent problem in the prevention and treatment of regional air environmental pollution. Therefore, in recent years, countries have implemented stricter smoke emission control standards, and the smoke pollutant emission limit value is greatly reduced. In order to achieve standard emission, the most direct solution is generally adopted for the existing wet desulphurization system, namely increasing the ratio of the desulphurization liquid to the desulphurization gas to improve the desulphurization efficiency. Because of the increase of the liquid-gas ratio, more fog drops containing the desulfurization slurry can enter a demister along with flue gas; the existing folded plate demister has low demisting efficiency on fog drops below 20 mu m, a large amount of fine fog drops pass through a demister discharge chimney, condensed water is separated out from saturated flue gas containing desulfurization slurry fog drops along with the reduction of temperature in the discharge process, gypsum rain, ammonium sulfate aerosol and the like are formed at the periphery of a desulfurization device together with escaping fog drops, the particulate matter discharge is caused to seriously exceed the standard, and a new environmental problem is brought to enterprises.
On the other hand, the existing method for treating solid-containing wastewater generated by catalytic cracking flue gas desulfurization has the following problems: firstly, because the catalyst particles in the solid-containing wastewater of catalytic cracking flue gas desulfurization are fine, the particles with the particle size of 1.0-5 mu m account for more than 76 percent, the solid content is as high as 0.15-0.5 percent, and the separation efficiency is low by the conventional liquid-solid precipitation method, and the requirement of the emission standard cannot be met; secondly, the fine filter is often blocked, so that the requirement of normal operation of the production device is more difficult to meet after the emission standard of the flue gas is improved.
Meanwhile, considering that the problems of large water consumption and low water resource efficiency of petrochemical industry project units in China at present, the large scale and the large volume of petrochemical production devices and the fact that water resources become a prominent contradiction related to the development of the petrochemical industry in China, a high-efficiency separation technology with high solid-liquid settling separation efficiency, low system operation cost, investment saving and small occupied area is needed so as to enhance the water resource recycling system of the petrochemical device and integrally improve the water resource efficiency in the petrochemical production process.
Disclosure of Invention
The invention aims to meet the national requirement for improving the flue gas emission control standard, overcome the defects of the conventional flue gas desulfurization wastewater treatment technology, aim at the industrial characteristics of the solid-containing wastewater of catalytic cracking flue gas desulfurization and consider the integral improvement of the water resource efficiency of a catalytic cracking flue gas desulfurization device, and provide a novel coupling separation device for efficiently removing SS (suspended substances) in the catalytic cracking flue gas desulfurization wastewater.
In order to achieve the purpose, the invention adopts the technical scheme that: a coupling separation device for removing SS (suspended solid) in catalytic cracking flue gas desulfurization wastewater comprises a tank body, a two-stage reaction stirring coagulation device, a guide cylinder, a guide reflection device, a mud scraper, a sludge concentration hopper and a sludge collection reflux device. The two-stage reaction stirring coagulator is arranged outside the tank body and is communicated with the guide flow cylinder through a liquid inlet pipe, liquid, solid and chemicals enter the guide flow cylinder after being mixed and coagulated and backflow granular sludge is condensed, the guide flow cylinder is arranged below the guide flow cylinder, the areas in the tank body around the guide flow cylinder and the guide flow reflection device are arranged into a clarification area, the top of the clarification area is provided with a liquid outlet pipe, the bottom of the clarification area is provided with a cone-shaped bottom plate, the sludge concentration hopper is arranged at the lower port of the center of the bottom plate, the sludge scraper is arranged above the periphery of the bottom plate, and the sludge collection reflux device is arranged below the bottom plate.
Preferably, an inclined plate for ascending and guiding clarified liquid is arranged below the liquid outlet pipe and above the clarification zone, and the inclined plate is arranged between the outer wall of the guide cylinder and the inner wall of the tank body.
Preferably, the liquid outlet pipe at the top of the clarification zone is positioned outside the tank body and is connected with the liquid outlet of the water collecting weir plate.
As a further priority of the scheme, the mud scraper comprises a speed reduction motor, a transmission shaft, a scraping arm and a scraping plate, wherein the scraping plate is positioned above a bottom plate at the bottom of the clarification area.
Preferably, the guide shell is of a primary or secondary structure; the first-stage guide cylinder is composed of a first-stage guide cylinder, and the upper end of the first-stage guide cylinder is fixedly connected to the center of the top end of the groove body; the second-stage guide cylinder is composed of a first-stage guide cylinder and a second-stage guide cylinder, and the second-stage guide cylinder is sleeved on the periphery of the first-stage guide cylinder.
Preferably, the sludge collecting and returning device is used for collecting sludge with a heavier specific gravity at the bottom of the clarification zone, and the sludge collected in the sludge collecting and returning device is lifted by the slurry pump through a return outlet and then flows back to the two-stage reaction stirring and coagulation device, so as to enhance the settling and separating efficiency of the system.
Preferably, the sludge collecting and returning device is arranged at the center between the center of the bottom of the conical bottom plate and the outer wall of the tank body.
As a further preferred mode of the scheme, the sludge concentration hopper is funnel-shaped, and the bottom of the sludge concentration hopper is connected with a sludge discharge pipe; the sludge concentration hopper is used for further concentrating the sludge with light specific gravity so as to improve the sludge discharge concentration.
Compared with the prior art, the invention has the beneficial effects that: based on the unique structural design of the high-efficiency coupling separation technical device, the device realizes the aim of high-efficiency separation of the catalytic cracking flue gas desulfurization high-solid-content wastewater through the following functions:
1. and a fluid flow guide device is arranged to enhance the solid-liquid separation effect. The center position in the clarification device is arranged in to the draft tube, and draft tube upper end mouth is equipped with the inlet, and the draft tube structure can set up to one-level (I level) or second grade (I level + II level), and I level draft tube upper end fixed connection is in the top center department of cell body, and the I level draft tube outside is arranged in to its II level draft tubes of second grade draft tube structure, and it is fast to solve to contain solid waste water entering clarification district velocity of flow, the water distribution is inhomogeneous, turbulent flow serious scheduling problem to realize high-efficient separation.
2. Set up collection mud reflux unit, promote backward flow mud concentration. Sludge at the bottom of the clarification device is scraped into the sludge collection reflux device through the sludge scraper, so that the concentration of the returned sludge is improved, the process condition that the concentration of the returned sludge in the conventional mechanical clarification tank is lower is changed, the returned sludge is rapidly condensed with liquid, solid and medicine to form large-particle aggregates to accelerate sedimentation, and the aim of efficiently separating the liquid from the solid is fulfilled.
3. And a sludge concentration hopper is arranged for sludge reduction treatment. Sludge at the bottom of the clarification device is scraped into a sludge concentration hopper by a mud scraper for further concentration, and the sludge is concentrated to 3 percent, thereby reducing the sludge treatment capacity and consumption and achieving the aims of energy conservation and consumption reduction.
In conclusion, the coupling separation device for removing SS in catalytic cracking flue gas desulfurization wastewater has the following characteristics:
1. the solid-liquid separation efficiency is high, the SS removing treatment effect is good, and the method is suitable for treating high-concentration fine particle solid-containing industrial wastewater.
2. The problem that the existing flue gas desulfurization causes the standard exceeding of flue gas emission particulate matters due to the increase of the liquid-gas ratio and the improvement of the desulfurization effect can be solved.
3. The waste water treatment system has the advantages of low investment, small occupied area and low operating cost.
4. And a foundation is laid for enhancing the water resource recycling and integrally improving the water resource efficiency of the process system.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Labeled as: the device comprises a tank body 1, a double-stage reaction stirring coagulator 2, a guide flow cylinder 3-I stage, a guide flow cylinder 4-II stage, a guide flow reflection device 5, a clarification area 6, a bottom plate 7, a sludge concentration hopper 8, a sludge collection reflux device 9, a liquid inlet pipe 10, a liquid outlet pipe 11, a water collection weir plate 12, an inclined plate 13, a speed reduction motor 14, a transmission shaft 15, a scraping arm 16 and a blow-off pipe 17.
Detailed Description
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, and not all of the embodiments. 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.
Referring to fig. 1, the present embodiment provides: a coupling separation device for removing SS (suspended solid) in catalytic cracking flue gas desulfurization wastewater comprises a tank body 1, a two-stage reaction stirring coagulation device 2, a guide cylinder, a guide reflection device 5, a mud scraper, a sludge concentration hopper 8 and a sludge reflux device 9, wherein the two-stage reaction stirring coagulation device 2 is arranged on the outer side of the tank body 1, which is communicated with the guide shell through a liquid inlet pipe 10, liquid, solid and medicament enter the guide shell after being mixed and coagulated and returned to granular sludge for coagulation, the guide flow reflection device 5 is arranged below the guide flow cylinder, the area in the groove body around the guide flow cylinder and the guide flow reflection device 5 is set as a clarification area 6, a liquid outlet pipe 11 is arranged at the top of the clarification zone 6, a conical bottom plate 7 is arranged at the bottom, the sludge concentration hopper 8 is arranged at the lower port of the center of the bottom plate 7, and the mud scraper is arranged above the periphery of the bottom plate 7, and the mud collecting reflux device 9 is arranged below the bottom plate 7.
In this embodiment, an inclined plate 13 is arranged below the liquid outlet pipe 11 and above the clarification zone 6, and the inclined plate 13 is installed between the outer wall of the draft tube and the inner wall of the tank body 1; the setting of swash plate 13 makes the clarified liquid upwelling rise along swash plate 13 surface, has set up extra guiding device on the one hand equivalently, can alleviate disturbance and turbulent phenomenon, and on the other hand has equivalently increased the overflow area and has made the lime sediment on swash plate 13 surface, reduces the settling distance, shortens the clarification time. The clarified clear liquid is discharged through a water collecting weir plate 12 and a liquid outlet pipe 11.
In the embodiment, the mud scraper comprises a speed reducing motor 14, a transmission shaft 15 and a scraping arm 16, wherein the scraping arm 16 is arranged above the bottom plate 7 at the bottom of the clarification zone. Because the bottom plate 7 is in an inverted cone shape, the speed reduction motor 14 drives the scraping arm 16 to operate, the scraping arm 16 scrapes a part of sludge on the bottom plate 7 into the sludge concentration hopper 8, the bottom of the sludge concentration hopper 8 is provided with a sludge outlet, and the sludge outlet is connected with the sludge discharge pipe 17 and discharges the concentrated sludge out of the tank body 1 through a sludge pump. On the other hand, the scraping arm 16 scrapes a part of sludge on the bottom plate 7 into the sludge collecting reflux device 9, and the sludge collected in the sludge collecting reflux device 9 is lifted by a slurry pump through a reflux outlet and then flows back to the two-stage reaction stirring and mixing condenser 2 for recycling, so that the process condition of the sludge with lower reflux concentration of the conventional mechanical settling pond is changed, the reflux sludge is rapidly condensed with liquid, solid and medicine to form large-particle aggregates for accelerated settling, and the purpose of efficiently separating the liquid from the solid is achieved.
In this embodiment, the guide shell may be configured as a primary structure or a secondary structure. Wherein, one-level draft tube comprises I level draft tube 3, and this I level draft tube 3 upper end fixed connection is in the top center department of cell body 1. The second grade draft tube comprises a first grade draft tube 3 and a second grade draft tube 4, and the upper end of the second grade draft tube 4 is sleeved on the periphery of the first grade draft tube 3. When the flow velocity is faster, the draft tube with the secondary structure is arranged, so that the problems of high flow velocity, uneven water distribution, serious turbulence and the like when solid wastewater enters a clarification area can be solved, and efficient separation is realized.
The working process of the device is as follows: the reagent feeding port is added into the two-stage reaction stirring and mixing condenser 2, the mixture is rapidly stirred and mixed by the two-stage reaction stirring and mixing condenser 2, the retention time is set to be 3-5 minutes, so that the reagent is fully contacted with solid-containing wastewater and is subjected to coagulation reaction, then the reagent and the solid-containing wastewater enter the guide cylinder through the liquid inlet pipe 10 (a controllable valve is arranged on the liquid inlet pipe), the reagent and the solid-containing wastewater fall onto the guide reflection device 5 and are distributed into the clarification zone 6 through the guide reflection device 5, and the flow rate of the fluid is set to just enable the guide reflection device 5 to push and flow the sewage/the sewage to the edge of the tank body 1 of the clarification zone, so that the disturbance and the turbulence degree caused by water. The inclined plate 13 is arranged above the clarification zone 6, so that the ascending flow ascends along the surface of the inclined plate 13, on one hand, the device is equivalent to an additional flow guide device, the disturbance and the turbulence phenomenon can be reduced, on the other hand, the overflowing area can be increased, so that the sludge ash is precipitated on the surface of the inclined plate 13, the precipitation distance is reduced, and the clarification time is shortened. In addition, because the bottom plate 7 at the bottom of the clarification zone 6 is in an inverted cone shape, the speed reduction motor 14 drives the scraping arm 16 to operate, the scraping arm 16 scrapes part of sludge on the bottom plate 7 into the sludge concentration hopper 8, a sludge outlet is arranged at the bottom of the sludge concentration hopper 8, the sludge outlet is connected with a sludge discharge pipe 17, and the concentrated sludge is discharged out of the tank body 1 through a sludge pump. Meanwhile, the scraping arm 16 scrapes a part of sludge on the bottom plate 7 into the sludge collecting reflux device 9, and the sludge collected in the sludge collecting reflux device 9 is lifted by a slurry pump through a reflux outlet and then flows back to the two-stage reaction stirring and mixing condenser 2 for recycling, so that the process condition that the concentration of the returned sludge of the conventional mechanical clarification tank is low is changed, the returned sludge is rapidly condensed with liquid, solid and medicine to form large-particle aggregates for accelerated sedimentation, and the purpose of efficiently separating the liquid from the solid is achieved.
Finally, it should be noted that while the above-mentioned illustrates and describes embodiments of the present invention, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
The parts not involved in the present invention are the same as or can be implemented using the prior art.

Claims (7)

1. A coupling separation device for removing SS (suspended solid) in catalytic cracking flue gas desulfurization wastewater, the device comprises a tank body, a two-stage reaction stirring coagulator, a guide flow cylinder, a guide flow reflection device, a mud scraper, a sludge concentration hopper and a sludge collection reflux device, wherein the two-stage reaction stirring coagulator is arranged at the outer side of the tank body, which is communicated with the guide shell through a liquid inlet pipe, liquid, solid and medicament enter the guide shell after being mixed and coagulated and returned to granular sludge, the guide flow reflection device is arranged below the guide flow cylinder, the guide flow cylinder and the area in the groove body around the guide flow reflection device are arranged as clarification areas, the top of the clarification zone is provided with a liquid outlet pipe, the bottom of the clarification zone is provided with a cone-shaped bottom plate, the lower port of the center of the bottom plate is provided with the sludge concentration hopper, and the mud scraper is arranged above the periphery of the bottom plate, and the mud collecting reflux device is arranged below the bottom plate.
2. The coupling separation device for removing the SS (suspended solid) in the catalytic cracking flue gas desulfurization wastewater according to claim 1, wherein an inclined plate for ascending and guiding the clarified liquid is arranged below the liquid outlet pipe and above the middle upper part of the clarification zone, and the inclined plate is arranged between the outer wall of the guide cylinder and the inner wall of the tank body.
3. The coupling and separating device for removing the SS wastewater generated by the catalytic cracking flue gas desulfurization according to claim 1, wherein the mud scraper comprises a speed reduction motor, a transmission shaft and a scraping arm, and the scraping arm is arranged above a bottom plate at the bottom of the clarification zone.
4. The coupling separation device for removing the SS from the catalytic cracking flue gas desulfurization wastewater according to claim 1, wherein the guide shell has a primary or secondary structure; the first-stage guide cylinder is composed of a first-stage guide cylinder, and the upper end of the first-stage guide cylinder is fixedly connected to the center of the top end of the groove body; the second-stage guide cylinder is composed of a first-stage guide cylinder and a second-stage guide cylinder, and the second-stage guide cylinder is sleeved on the periphery of the first-stage guide cylinder.
5. The coupling separation device for removing the SS (suspended solid) from the catalytic cracking flue gas desulfurization wastewater according to claim 1, wherein the sludge collecting reflux device is arranged at the center between the center of the bottom of the conical bottom plate and the outer wall of the tank body.
6. The coupling separation device for removing the SS from the catalytic cracking flue gas desulfurization wastewater according to claim 5, wherein the sludge collection reflux device is used for collecting the sludge with a heavier specific gravity at the bottom of the clarification zone, and the sludge collected in the sludge collection reflux device is lifted and refluxed to the two-stage reaction stirring and coagulating device through the reflux outlet thereof and the slurry pump so as to enhance the settling separation efficiency of the system.
7. The coupled separation device for removing the SS from the catalytic cracking flue gas desulfurization wastewater as recited in claim 1, wherein the sludge concentrating hopper is used for further concentrating the sludge with low specific gravity to increase the sludge concentration.
CN201911127358.XA 2019-11-18 2019-11-18 Coupling separation device for removing SS (suspended substance) in catalytic cracking flue gas desulfurization wastewater Pending CN110745927A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111450581A (en) * 2020-05-18 2020-07-28 宜兴市荣盛达环保有限公司 High-effect solid-liquid clarification separator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111450581A (en) * 2020-05-18 2020-07-28 宜兴市荣盛达环保有限公司 High-effect solid-liquid clarification separator

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