CN116688741A - System and process for eliminating gypsum accumulation in central area of slurry pool of large-diameter absorption tower - Google Patents

System and process for eliminating gypsum accumulation in central area of slurry pool of large-diameter absorption tower Download PDF

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Publication number
CN116688741A
CN116688741A CN202310602128.4A CN202310602128A CN116688741A CN 116688741 A CN116688741 A CN 116688741A CN 202310602128 A CN202310602128 A CN 202310602128A CN 116688741 A CN116688741 A CN 116688741A
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China
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slurry
diversion
tower
tower body
absorption tower
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CN202310602128.4A
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Inventor
仇洪波
周永跃
刘述平
吕和武
吕扬
高星磊
杨凤岭
冯超
董如鑫
尹鹏
管闯
李智洋
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Shandong Guoshun Construction Group Co Ltd
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Shandong Guoshun Construction Group Co Ltd
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Priority to CN202310602128.4A priority Critical patent/CN116688741A/en
Publication of CN116688741A publication Critical patent/CN116688741A/en
Pending legal-status Critical Current

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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B01F27/70—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms
    • B01F27/701—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers
    • B01F27/706—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis with paddles, blades or arms comprising two or more shafts, e.g. in consecutive mixing chambers with all the shafts in the same receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/808—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers driven from the bottom of the receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/90—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with paddles or arms 
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/606—Carbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/608—Sulfates
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a system and a method for eliminating gypsum accumulation in the central area of a slurry pool of a large-diameter absorption tower, wherein a bottom cone bucket collects sprayed slurry to form liquid level potential energy, the collected slurry rapidly flows down through a diversion throat, impacts a diversion blade, the slurry forms a rotational flow under the diversion effect of the diversion blade, the rotational flow slurry is rotated obliquely downwards under the diversion effect of a diffusion port, and is matched with a side-entering stirrer component to eliminate gypsum suspension dead areas in the central area and the bottom area of the slurry pool of the absorption tower. The system utilizes the liquid level potential energy of the whole circulating slurry and the kinetic energy of downward impact to effectively cooperate with the side-entering stirrer to solve the gypsum accumulation problem in the central area of the slurry tank, and the suspension of the slurry tank at the bottom of the whole absorption tower is realized through the system and the process.

Description

System and process for eliminating gypsum accumulation in central area of slurry pool of large-diameter absorption tower
Technical Field
The invention belongs to the technical field of wet desulfurization, and particularly relates to a system and a method for eliminating gypsum accumulation in a central area of a slurry pool of a large-diameter absorption tower.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the field of wet desulfurization application, the limestone/lime-gypsum desulfurization process has the advantages of sufficient raw material supply, high desulfurization efficiency and the like, and becomes the first-choice desulfurization process for most industrial enterprises. In recent decades, the desulfurization process is always the main stream process in the technical field of atmospheric treatment of industrial enterprises, and the market coverage rate is as high as more than 90%. The most core equipment of the limestone/lime-gypsum desulfurization process is an absorption tower, and the limestone/lime-gypsum process is adoptedThe by-product is gypsum (CaSO) 4 ·2H 2 And O) particles with a large specific gravity are easy to deposit in the slurry pool at the bottom of the absorption tower, especially, the gypsum particles form accumulation in a suspension dead zone, namely the center area of the slurry pool at the bottom, so that the actual use volume of the slurry pool is greatly reduced, and the absorption tower cannot work normally in severe cases.
In this regard, the existing solutions are mainly the following two:
(1) Through setting up one or more layers of side formula agitators in the side of absorbing tower bottom thick liquid pond all around, evenly arrange, produce certain angle turning force and downward pushing force power, make the thick liquid in the absorbing tower inside take place the whole circulation to produce certain suspension force simultaneously, in order to prevent that the bottom of absorbing tower from taking place the gypsum deposition phenomenon.
(2) A special pulse suspension system is additionally arranged, and the slurry in the tower is subjected to strong up-down disturbance in the whole cross section range by a high-flow pulse suspension pump, so that the gypsum deposition phenomenon in any area at the bottom of the absorption tower is prevented.
The diameter of the absorption tower is generally 4-20m, and for large-diameter absorption towers (such as more than 10 m), the output power and the action range of the side-entering stirrer are far insufficient, so that the driving force cannot penetrate into the central area of the slurry pool at all. In practice, the central region of the slurry pool of the absorption tower is basically a suspended dead zone, and solid matters such as gypsum in the slurry are extremely easy to deposit in the suspended dead zone to form accumulation. Along with the continuous operation of the absorption tower, gypsum in the central area of the slurry pool is accumulated more and more seriously, the required cleaning time is longer, and the method is very unfavorable for shortening the maintenance period and quickly recovering production.
The application effect of adding a set of pulse suspension system is not ideal, the action area of the pulse nozzle is limited, and the gypsum deposition problem in the peripheral area of the absorption tower and the area away from the pulse nozzle still exists. The pulse suspension pump not only has larger body shape and occupies valuable peripheral space of the absorption tower, but also has huge power consumption and high energy consumption during operation. In addition, the abrasion of the pulse suspension pipeline and the nozzle is serious, and the process reliability is not high. Once a problem occurs in the pulse suspension pipe or nozzle, the absorber slurry pool will immediately deposit, resulting in an inability to function properly.
Disclosure of Invention
The absorber contains a huge amount of circulating slurry flowing back and forth up and down, and huge potential energy and impact energy are not developed and utilized. The circulating slurry is pumped out from the bottom of the absorption tower in a concentrated way, is lifted to a spraying layer at the top of the absorption tower under the pressurized driving of a circulating pump, and then is sprayed down from top to bottom and falls into the slurry pool in a uniform and dispersed manner in a slurry particle manner. However, the high potential energy and the impact kinetic energy generated when falling down are wasted. The huge amount of circulating slurry refers to the total flow of circulating slurry in an absorption tower, and because the wet desulfurization process generally adopts a plurality of circulating pumps to spray in the tower, the liquid-gas ratio reaches 10-30L/Nm during operation 3 Therefore, the total flow rate of the circulating pump can be very large, and can reach or exceed the total push liquid amount of the side-entering stirrer of the absorption tower by tens times. In the face of such huge amount of circulating slurry, if an effective process and method are adopted, the liquid level potential energy and the downward impact kinetic energy contained in the whole circulating slurry are utilized to a certain extent, so that the liquid level potential energy and the downward impact kinetic energy are cooperated with a side-entering stirrer, and the slurry pool at the bottom of the absorption tower is enabled to obtain sufficient stirring and suspending energy, so that the problem of gypsum deposition at the bottom of the slurry pool of the absorption tower can be thoroughly solved.
In view of the deficiencies of the prior art, it is an object of the present invention to provide a system and method for eliminating gypsum accumulation in the central region of a large diameter absorber slurry pond. The system utilizes the liquid level potential energy of the whole circulating slurry and the kinetic energy of downward impact to effectively cooperate with the side-entering stirrer to solve the gypsum accumulation problem in the central area of the slurry tank, and the suspension of the slurry tank at the bottom of the whole absorption tower is realized through the system and the process.
In order to achieve the above object, the present invention is realized by the following technical scheme:
in a first aspect, the invention provides a system for eliminating gypsum accumulation in a central area of a slurry pool of a large-diameter absorption tower, which comprises a tower body, a bottom cone bucket, a guide vane assembly and a side-entering stirrer assembly, wherein the bottom cone bucket is arranged on the side wall of the bottom of the tower body through a large-diameter end of the bottom cone bucket, and a small-diameter end of the bottom cone bucket is connected with a small-diameter end of a diffusion opening through a guide throat;
the guide vane component is fixedly arranged at the bottom of the tower body in a radial shape through the central shaft, is in a fan shape and is positioned at the inner side of the diffusion opening;
the side-entering stirrer is arranged on the side wall of the bottom of the tower body, and the advancing direction of the side-entering stirrer to the slurry is the same as the rotational flow direction of the guide vane;
the bottom cone bucket collects sprayed slurry to form liquid level potential energy, the collected slurry flows down fast through a diversion throat, impacts a diversion blade, the slurry forms rotational flow under the diversion effect of the diversion blade, the rotational flow slurry flows obliquely downwards under the diversion effect of a diffusion opening, and the rotational flow slurry is matched with a side-entering stirrer component to eliminate gypsum suspension dead areas in the central area and the bottom area of a slurry pool of an absorption tower.
When the circularly sprayed slurry is dispersed and dropped in a liquid drop shape, strong mechanical impact force can not be generated. The system firstly utilizes the bottom cone hopper to collect a large amount of circulating slurry sprayed from the upper part of the absorption tower, and the circulating slurry is collected above the bottom cone hopper, so that the circulating slurry naturally flows downwards under the driving of liquid level potential energy, and equipment and components such as the bottom cone hopper, the diversion throat, the diversion blades, the diffusion openings and the like. The bottom cone hopper, the diversion throat, the diversion vanes, the diffusion opening and other devices are all arranged right above the central area of the slurry pool and directly face the key area where potential gypsum accumulation can occur. Due to the smaller diameter of the flow diversion throat, the slurry flowing through will be accelerated, thus creating a considerable mechanical impact force. Such mechanical impact forces would be quite striking given the very large total amount of recycled slurry. The accelerated slurry is impacted in a surfing mode in the inclined downward and circumferential directions through the diffusion opening, so that a stronger suspension stirring effect of the whole bottom area is generated.
The flow guiding throat is also provided with flow guiding vanes, the downward impacting slurry also generates a certain transverse rotation acting force, and the direction of the transverse rotation acting force is consistent with the advancing direction of the side-entering stirrer, so that a synergistic effect in the aspect of rotary flow is formed in the slurry pool, namely: the slurry flowing out of the diffusion opening transversely rotates and flows downwards obliquely, and the slurry is pushed by the side-entering stirrer around to rotate and flow in the same direction as the slurry pushed by the side-entering stirrer around, so that the integral homodromous rotation driving force of the slurry at the bottom of the tower is formed, and the integral suspension state is obviously improved. Slurry flowing out of the diffusion opening and facing obliquely downwards can have a good impact effect on the bottom of the tower, so that the settlement of gypsum can be further prevented.
Therefore, the system of the invention not only can overcome the problem that gypsum accumulation occurs because the original central area cannot obtain sufficient suspension power, but also can greatly improve the suspension level of the bottom area of the slurry pool of the whole absorption tower.
After the system of the invention is put into operation, the unfavorable situation that the suspension can be carried out by pushing and hydraulic power of the side-entering stirrer is changed into: the beneficial situation of suspension is realized by the cooperation of downward impact and transverse rotation impact generated from the central area of the absorption tower and lateral rotation thrust generated from the side wall area of the absorption tower by virtue of the stirrer. This situation ensures that the entire bottom area of the absorber slurry pond is no longer free of any suspended dead space.
The impact kinetic energy converted from the potential energy of the circulating slurry is utilized by the suspension process, and the fundamental source of the energy is the driving force of the existing circulating pump, so that the suspension process does not need new and additional mechanical kinetic energy injection in the operation process, and accords with the principles of energy conservation and consumption reduction.
All parts of the system are fixedly installed, the guide vane can not rotate, the overall reliability and the service life can be improved, and long-term stable operation is ensured.
In some embodiments, the ratio of the flow directing throat to the inner diameter of the tower is 1:5-10. The diversion throat in the proportion range can effectively collect the slurry sprayed circularly and has better acceleration effect on the slurry, so that the slurry can generate larger impact force.
In some embodiments, a liquid storage cylinder is enclosed between the upper part of the bottom cone and the tower body, and the volume of the liquid storage cylinder is 1/3-1/2 of the volume of the slurry pool.
Preferably, the side wall of the bottom cone is inclined at an angle of 50 ° -75 °.
In some embodiments, a wear-resistant ceramic plate is arranged below the guide vane, is arranged at the bottom of the tower body, is positioned below the diffusion opening, and has a diameter at least larger than that of the large-diameter end of the diffusion opening.
Preferably, the area of the wear-resistant ceramic plate is not smaller than 4-10 times of the sectional area of the diversion laryngeal opening. The cyclone slurry flowing down from the diffusion port has high flow velocity, and a large amount of solid particles are carried in the slurry, so that strong friction force is generated on the bottom of the tower body. And a wear-resistant ceramic plate is arranged at the position and is used for effectively protecting the bottom of the tower.
Preferably, the thickness of the wear-resistant ceramic plate is 10-20mm.
In some embodiments, the tower body and the bottom cone are made of corrosion-resistant materials, and the thickness is 6-20mm. The surfaces of the tower body and the bottom cone hopper are smoothly arranged.
Preferably, the bottom cone is supported by adopting a reinforcing rib and a supporting structure. To ensure adequate load carrying capacity.
In some embodiments, the ratio of the central axis to the diameter of the diversion throat is 1:0.2-0.5. The central shaft has enough supporting strength to bear the impact force of the liquid flow transmitted by the guide rotating blades; the central shaft is made of corrosion-resistant and wear-resistant materials;
the guide vane can make the slurry flowing at the guide throat generate a component force of lateral rotation, so that the slurry can flow downwards in an impact manner and also has a certain lateral rotation.
The initial velocity of the rotary flow generated by the guide vane is basically consistent with the initial flow velocity of the rotary pushing of the lateral stirrer arranged on the wall of the absorption tower.
In some embodiments, the number of guide vanes is 4-8, each having an angle of inclination of 30 ° -55 °.
Preferably, the thickness of the guide vane is 10-30mm. The guide vane is made of corrosion-resistant and wear-resistant materials, has the thickness controlled between 10 mm and 30mm, and has enough impact strength and service life.
In some embodiments, the ratio of the distance of the diffuser to the bottom plate of the tower to the throat diameter is 1:0.5-1.5.
In some embodiments, the bottom of the tower body is connected with the spraying layer at the top of the tower body through a slurry circulating pipe and a slurry circulating pump, and the connection position of the slurry circulating pipe and the tower body is higher than the installation position of the Yu Cejin stirrer.
In a second aspect, the present invention provides a method for eliminating gypsum accumulation in a central region of a slurry pond of a large diameter absorber, comprising the steps of:
the bottom cone bucket collects the slurry sprayed circularly and forms liquid level above the bottom cone bucket to form liquid level potential energy;
the collected slurry is accelerated in the process of flowing through the diversion throat, and forms rotational flow under the diversion effect of the diversion vane after flowing through the diversion vane;
the swirling slurry forms fluid which is directed to the swirling flow obliquely downwards under the diversion effect of the diffusion opening, plays the roles of impacting and suspending the slurry at the bottom of the tower, and eliminates the gypsum suspension dead zone at the bottom of the tower together with the side-entering stirrer.
In some embodiments, the slurry flow rate of the diversion throat is 1-2.5m/s.
The beneficial effects achieved by one or more embodiments of the present invention described above are as follows:
the invention firstly uses the bottom cone hopper to concentrate all the circulating slurry which is sprayed and fallen to form a certain liquid level potential energy, then releases the potential energy downwards from the central area of the slurry pool, so that the potential energy has huge impact energy to the bottom of the central area, and the slurry has a certain transverse rotation force under the action of the guide vane at the throat opening, thereby thoroughly eliminating the gypsum suspension dead zone of the central area and the whole bottom area and fundamentally solving the gypsum deposition problem;
the power requirements of the side-entering stirrer can be reduced to a certain extent by having good rotation synergistic effect with the side-entering stirrer;
the liquid level potential energy of the original white-lost circulating slurry is utilized, and the whole system and the running process have no newly increased energy consumption.
All parts of the system are fixedly arranged, no moving parts exist, and the operation is stable and reliable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a schematic diagram of the overall construction of a system for removing gypsum buildup in the center area of an absorber slurry pond according to an embodiment of the present invention;
FIG. 2 is an enlarged view of the working area of an embodiment of the present invention;
FIG. 3 is a system cross-sectional view of a work area of an embodiment of the present invention;
fig. 4 is a schematic view of a structure of a rotary guide vane according to an embodiment of the present invention.
Wherein, 1-a liquid storage cylinder; 2-side entry stirrer; 3-a slurry circulation pump; 4-slurry circulation pipe; 5-spraying pipe; 6-a bottom cone bucket; 7-diversion laryngeal opening; 8-a diffusion port; 9-guide vanes; 10-center axis; 11-wear-resistant ceramic plate.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The invention is further illustrated below with reference to examples.
As shown in fig. 1 and 2, a system for eliminating gypsum accumulation in the central area of a slurry pool of a large-diameter absorption tower comprises a tower body, a bottom cone bucket 6, a guide vane 9 assembly and a side-entering stirrer 2 assembly, wherein the bottom cone bucket 6 is arranged on the side wall of the bottom of the tower body through a large-diameter end thereof, and a small-diameter end of the bottom cone bucket 6 is connected with a small-diameter end of a diffusion port 8 through a guide throat 7; a liquid storage cylinder is enclosed between the upper part of the bottom cone hopper and the tower body, and the volume of the liquid storage cylinder is 1/3-1/2 of the volume of the slurry pool; the side wall of the bottom cone 6 is inclined at an angle of 50-75 deg..
The guide vane 9 assembly is fixedly arranged at the bottom of the tower body in a radial shape through a central shaft, is in a fan shape and is positioned at the inner side of the diffusion opening;
the lower part of the guide vane 9 is provided with a wear-resistant ceramic plate 11, the wear-resistant ceramic plate 11 is arranged at the bottom of the tower body, is positioned below the diffusion opening 8, and has a diameter at least larger than that of the large-diameter end of the diffusion opening 8; the area of the wear-resistant ceramic plate 11 is not smaller than 4-10 times of the sectional area of the diversion throat opening 7; the thickness of the wear-resistant ceramic plate 11 is 10-20mm.
The side-entering stirrer 2 is arranged on the side wall of the bottom of the tower body, and the advancing direction of the side-entering stirrer to the slurry is the same as the rotational flow direction of the guide vane 9;
the bottom cone bucket 6 collects sprayed slurry to form liquid level potential energy, the collected slurry flows down fast through the diversion throat 7, impacts the diversion blades 9, the slurry forms rotational flow under the diversion effect of the diversion blades 9, the rotational flow slurry flows obliquely downwards under the diversion effect of the diffusion opening 8, and the rotational flow slurry is matched with the side-entering stirrer 2 component to eliminate gypsum suspension dead areas in the central area and the bottom area of the slurry pool of the absorption tower.
The bottom of the tower body is connected with a spraying layer at the top of the tower body through a slurry circulating pipe 4 and a slurry circulating pump 3, and the connecting position of the slurry circulating pipe 4 and the tower body is higher than the mounting position of the Yu Cejin stirrer 2.
The tower body and the bottom cone hopper 6 are made of corrosion-resistant materials, and the thickness is 6-20mm; the bottom cone hopper 6 is supported by adopting a reinforcing rib and a supporting structure;
the diameter ratio of the central shaft 10 to the diversion throat 7 is 1:0.2-0.5.
The number of the guide vanes 9 is 4-8, and the inclination angle of each vane is 30-55 degrees; the thickness of the guide vane is 10-30mm.
The ratio of the distance between the diffusion opening 8 and the tower bottom plate to the diameter of the throat opening is 1:0.5-1.5.
The operation of the system for eliminating gypsum accumulation in the central region of the slurry pond of the large-diameter absorption tower comprises three processes, respectively shown as follows:
the first process, the collection process, is: firstly, a huge amount of circulating slurry which naturally falls after gas-liquid reaction contact in the absorption towers is collected in a liquid storage cylinder to be concentrated, and liquid level potential energy is accumulated to a certain extent.
The volume of the liquid storage cylinder is controlled in the range of 1/3-1/2 of the volume of the slurry pool;
the upper section of the liquid storage cylinder is the same as the slurry Chi Jiemian of the absorption tower, namely, the liquid storage cylinder can completely seal the downward flow of the circulating slurry, so that all the slurry can only be released downwards in a centralized manner through a diversion throat opening, a diversion rotary vane, a central shaft and the like at the bottom of the liquid storage cylinder, thereby forming a certain downward potential energy impact, but not entering the bottom of the slurry tank downwards in a direct droplet dispersing manner like the original one, and in that case, the droplet-like dispersed slurry does not have any downward mechanical impact force.
In the second process, the dropping and rotating process of the circulating slurry, namely, when a huge amount of circulating slurry flows downwards through the bottom cone hopper and the diversion throat, the circulating slurry is stirred by the central shaft and the diversion rotary blades arranged at the throat, and a certain degree of transverse rotation occurs.
The diversion throat is a closing-in section pipeline connected with the bottom cone hopper, and the flow speed of slurry in the section pipeline is obviously increased, so that a certain degree of downward impact force is generated;
the slurry flow rate of the diversion throat is controlled within the range of 1-2.5 m/s;
the length to diameter ratio of the diversion throat opening is controlled within the range of 1-4 times.
And in the third process, the release process, namely, huge circulating slurry flowing through a central shaft and guide rotating blades, generates a larger vertical impact force downwards, generates a certain rotating force under the action of the guide blades, then gushes out to the periphery of a diffusion port, and generates a peripheral rotation synergistic effect with a side-entering stirrer arranged on the tower wall, so that huge suspension force is generated on the slurry at the bottom of the tower together, the integral suspension effect at the bottom of the slurry tank of the absorption tower is ensured, and no suspension dead zone exists. In order to prevent rapid wear of the bottom plate directly below the diffusion opening, a wear-resistant ceramic plate is laid there.
The process flow of the invention is described as follows:
the circulating slurry in the absorption tower is sprayed into the tower through the circulating pump group 3, the circulating pipe group 4 and the spray pipe group 5, then falls into the liquid storage barrel 1 downwards, flows through the bottom cone hopper 6 and the diversion throat 7, and generates impact flow downwards under the action of the diversion blades 9 and the central shaft 10, and meanwhile generates transverse rotary flow to a certain extent, and the direction of the transverse rotary flow is consistent with the direction of the slurry pushed by the stirrer. Then, the circulating slurry passes through the diffusion port 8, enters the bottom slurry pool, is pumped again by the circulating pump (group) 3 into the circulating pipe (group) 4 and the spraying pipe (group) 5, and flows in a reciprocating up-and-down circulating manner.
Wherein, the diffusion opening 8 is connected with the lower part of the slurry pool of the absorption tower;
the circulating slurry flows are scattered from the original disorder, are changed into collected by the liquid storage cylinder and then are released from the diffusion port in a concentrated mode, so that the flow field condition at the bottom of the slurry pool of the absorption tower is thoroughly changed, and a complete, fully effective slurry suspension system without dead areas at the bottom of the absorption tower is formed by cooperation with rotation of a side-entering stirrer.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A system for removing gypsum accumulation in a central region of a slurry pond of a large-diameter absorption tower, which is characterized in that: the side-entering type stirring device comprises a tower body, a bottom cone bucket, a guide vane assembly and a side-entering type stirrer assembly, wherein the bottom cone bucket is arranged on the side wall of the bottom of the tower body through a large diameter end of the bottom cone bucket, and a small diameter end of the bottom cone bucket is connected with a small diameter end of a diffusion opening through a guide throat;
the guide vane component is fixedly arranged at the bottom of the tower body in a radial shape through the central shaft, is in a fan shape and is positioned at the inner side of the diffusion opening;
the side-entering stirrer is arranged on the side wall of the bottom of the tower body, and the advancing direction of the side-entering stirrer to the slurry is the same as the rotational flow direction of the guide vane;
the bottom cone bucket collects sprayed slurry to form liquid level potential energy, the collected slurry flows down fast through a diversion throat, impacts a diversion blade, the slurry forms rotational flow under the diversion effect of the diversion blade, the rotational flow slurry flows obliquely downwards under the diversion effect of a diffusion opening, and the rotational flow slurry is matched with a side-entering stirrer component to eliminate gypsum suspension dead areas in the central area and the bottom area of a slurry pool of an absorption tower.
2. The system for removing gypsum accumulation in the center area of a large diameter absorber slurry pond according to claim 1, wherein: the ratio of the diversion throat opening to the inner diameter of the tower body is 1:5-10.
3. The system for removing gypsum accumulation in the center area of a large diameter absorber slurry pond according to claim 1, wherein: a liquid storage cylinder is enclosed between the upper part of the bottom cone hopper and the tower body, and the volume of the liquid storage cylinder is 1/3-1/2 of the volume of the slurry pool;
preferably, the side wall of the bottom cone is inclined at an angle of 50 ° -75 °.
4. The system for removing gypsum accumulation in the center area of a large diameter absorber slurry pond according to claim 1, wherein: the lower part of the guide vane is provided with a wear-resistant ceramic plate which is arranged at the bottom of the tower body, is positioned below the diffusion opening and has a diameter at least larger than that of the large-diameter end of the diffusion opening;
preferably, the area of the wear-resistant ceramic plate is not smaller than 4-10 times of the sectional area of the diversion laryngeal opening;
preferably, the thickness of the wear-resistant ceramic plate is 10-20mm.
5. The system for removing gypsum accumulation in the center area of a large diameter absorber slurry pond according to claim 1, wherein: the tower body and the bottom cone hopper are made of corrosion-resistant materials, and the thickness is 6-20mm;
preferably, the bottom cone hopper is supported by adopting a reinforcing rib and a supporting structure;
preferably, the diameter ratio of the central shaft to the diversion laryngeal opening is 1:0.2-0.5.
6. The system for removing gypsum accumulation in the center area of a large diameter absorber slurry pond according to claim 1, wherein: the number of the guide vanes is 4-8, and the inclination angle of each vane is 30-55 degrees;
preferably, the thickness of the guide vane is 10-30mm.
7. The system for removing gypsum accumulation in the center area of a large diameter absorber slurry pond according to claim 1, wherein: the ratio of the distance between the diffusion opening and the tower bottom plate to the diameter of the throat opening is 1:0.5-1.5.
8. The system for removing gypsum accumulation in the center area of a large diameter absorber slurry pond according to claim 1, wherein: the bottom of the tower body is connected with a spraying layer at the top of the tower body through a slurry circulating pipe and a slurry circulating pump, and the connecting position of the slurry circulating pipe and the tower body is higher than the mounting position of the Yu Cejin stirrer.
9. A method for eliminating gypsum accumulation in the central area of a slurry pool of a large-diameter absorption tower is characterized by comprising the following steps: the method comprises the following steps:
the bottom cone bucket collects the slurry sprayed circularly and forms liquid level above the bottom cone bucket to form liquid level potential energy;
the collected slurry is accelerated in the process of flowing through the diversion throat, and forms rotational flow under the diversion effect of the diversion vane after flowing through the diversion vane;
the swirling slurry forms fluid which is directed to the swirling flow obliquely downwards under the diversion effect of the diffusion opening, plays the roles of impacting and suspending the slurry at the bottom of the tower, and eliminates the gypsum suspension dead zone at the bottom of the tower together with the side-entering stirrer.
10. The method for eliminating gypsum accumulation in the center area of a large diameter absorber slurry pond according to claim 9, wherein: the slurry flow rate of the diversion throat is 1-2.5m/s.
CN202310602128.4A 2023-05-24 2023-05-24 System and process for eliminating gypsum accumulation in central area of slurry pool of large-diameter absorption tower Pending CN116688741A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117443175A (en) * 2023-11-22 2024-01-26 安徽雨辰机电制造有限公司 Desulfurization thick liquid does not have stirring and prevents deposiing device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117443175A (en) * 2023-11-22 2024-01-26 安徽雨辰机电制造有限公司 Desulfurization thick liquid does not have stirring and prevents deposiing device
CN117443175B (en) * 2023-11-22 2024-04-16 安徽雨辰机电制造有限公司 Desulfurization thick liquid does not have stirring and prevents deposiing device

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