CN111992321A - Limestone slurry preparation system and slurry preparation method - Google Patents

Limestone slurry preparation system and slurry preparation method Download PDF

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Publication number
CN111992321A
CN111992321A CN202010829566.0A CN202010829566A CN111992321A CN 111992321 A CN111992321 A CN 111992321A CN 202010829566 A CN202010829566 A CN 202010829566A CN 111992321 A CN111992321 A CN 111992321A
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CN
China
Prior art keywords
slurry
limestone slurry
limestone
ball mill
wet ball
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010829566.0A
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Chinese (zh)
Inventor
贾西部
黄伟岗
陈鹏
熊二虎
张新旭
郭静娟
康秦豪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Energy Hami Coal Power Co ltd
Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
Original Assignee
State Grid Energy Hami Coal Power Co ltd
Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Energy Hami Coal Power Co ltd, Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd filed Critical State Grid Energy Hami Coal Power Co ltd
Priority to CN202010829566.0A priority Critical patent/CN111992321A/en
Publication of CN111992321A publication Critical patent/CN111992321A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • 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
    • 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
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/10—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with one or a few disintegrating members arranged in the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C9/00—Combinations with other devices, e.g. fans, expansion chambers, diffusors, water locks
    • 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
    • B01D2251/602—Oxides

Abstract

The invention discloses a limestone slurry preparation system which comprises a primary wet ball mill, wherein an outlet of the primary wet ball mill is connected with a recirculation box; the recycling tank is connected with a limestone slurry cyclone through a slurry circulating pump, the underflow port of the limestone slurry cyclone is connected with the inlet of the primary wet ball mill, the overflow port of the limestone slurry cyclone is connected with a distributor, the distributor is connected with the inlet of a secondary separator, the underflow port of the secondary separator is connected with the inlet of a secondary wet ball mill, the overflow port of the secondary separator is connected with a limestone slurry tank, and the limestone slurry tank is connected with an absorption tower slurry pool through an absorption tower slurry supply pump. The invention also discloses a pulping method of the limestone slurry, wherein more than 90 percent of particles in the finished limestone slurry are less than 40 mu m. This lime stone thick liquid preparation system avoids unqualified lime stone thick liquid of fineness to carry to absorption tower thick liquid pond, delays the equipment wearing and tearing of thick liquid circulation system, reduces the calcium-sulfur ratio of desulfurization system operation.

Description

Limestone slurry preparation system and slurry preparation method
Technical Field
The invention belongs to the technical field of limestone-gypsum wet desulphurization equipment, and particularly relates to a limestone slurry preparation system and a pulping method thereof.
Technical Field
The phenomenon of accumulation of sediments at the bottom of the absorption tower generally exists in a limestone-gypsum wet desulphurization system, most of the sediments are limestone particles which do not meet the grinding requirement, and the least of the sediments are silica crystals which are doped in limestone ore and are not easy to grind. A large amount of sediments are piled up in the bottom of the absorption tower, and on the one hand, the desulfurization system sprays the circulation repeatedly along with the slurry circulating pump at the operation in-process, and the sediment granule causes the wearing and tearing of the inside lining and the impeller of slurry circulating pump, spraying layer pipeline and nozzle to influence the power of slurry circulating pump and the atomization effect on spraying layer. On the other hand, the continuous deposition of large solid particles reduces the volume of a slurry pool of the absorption tower, thereby bringing certain risks to the stable operation of the desulfurization system. On the other hand, in the machine set shutdown maintenance process, the sediment at the bottom of the absorption tower needs to be cleaned manually, so that the workload of machine set maintenance is greatly increased, and the maintenance period is prolonged.
The limestone slurry preparation system mainly comprises two processes, namely a limestone powder pulping process and a wet ball mill process. The powder pulping process comprises a limestone powder bin, a limestone slurry tank and a limestone slurry tank stirrerThe device comprises a fluidization fan, a fluidization air heater and a bin top dust remover. Limestone powder purchased from outside the plant (the passing rate of 325 meshes is 90 percent), and the limestone powder is conveyed into a limestone powder bin by an own pneumatic conveying pump for an external limestone powder tanker, is uniformly conveyed into a limestone slurry tank by a limestone powder feeder, and is then conveyed into filtrate water or standby water source process water in proportion to prepare the limestone powder with the density of 1200-1240 kg/m3And then the limestone slurry is pumped to the absorption tower by the limestone slurry pump. The wet ball mill process route is as follows: and transporting the limestone blocks with the granularity of less than or equal to 20mm purchased from the dump truck into a factory to be discharged into a discharge hopper, conveying the limestone in the discharge hopper into a vibrating conveyor with a metal separator by a feeder, and conveying the limestone into a limestone bin through an embedded scraper conveyor by a bucket elevator. The upper part of the discharge hopper is provided with a steel grating for preventing limestone with large grain size from entering. A shutoff door and a weighing feeder are arranged at the bottom outlet of a limestone bin, limestone and water are fed into a wet ball mill system according to a certain weight ratio (3:1) to be ground into limestone slurry, the slurry at the outlet of the ball mill flows downstream to a circulating slurry tank (each tank is provided with a stirrer), a circulating pump of the mill slurry sends the limestone slurry to a cyclone station, the limestone slurry is separated by the cyclone, a finished product which is qualified in overflow directly enters the limestone slurry tank, and a finished product which is unqualified in underflow enters a wet grinder to be ground continuously. Qualified limestone slurry is stored in a slurry tank and is pumped to the absorption tower by a limestone slurry pump.
The sediment in the limestone slurry is deposited in a box body without selectivity, sediment accumulation can also be carried out at the bottom of the limestone slurry box matched with the desulfurization system, and the accumulation amount of the sediment is mainly determined by the elevation of an inlet pipeline of a limestone slurry supply pump. When the accumulation amount of the sediment at the bottom of the limestone slurry tank reaches the upper limit, sediment particles are accumulated at the bottom of the absorption tower. The accumulation amount of the sediments in the absorption tower mainly depends on the usage amount of the limestone and the fineness of the limestone powder. The larger the usage amount of limestone is, the larger the deposition amount of the sediments is, with the same standard limestone powder in unit time. The same limestone dosage in unit time, the worse the limestone powder fineness, the larger the sediment measurement. Meanwhile, the elevation of the gypsum slurry discharge pump also has certain influence, but because the section of the absorption tower is overlarge, the deposition height and the shape of the sediments at the bottom of the absorption tower are related to the installation position of the inlet of the slurry circulating pump and the output of the stirrer of the absorption tower.
Disclosure of Invention
The invention aims to provide a limestone slurry preparation system, which can prevent limestone slurry with unqualified fineness from being conveyed to a slurry tank of an absorption tower, delay the equipment abrasion of a slurry circulating system and reduce the running calcium-sulfur ratio of a desulfurization system.
The invention also aims to provide a method for pulping the limestone slurry.
The invention adopts the technical scheme that the limestone slurry preparation system comprises a primary wet ball mill, wherein an outlet of the primary wet ball mill is connected with a recirculation box; the recycling tank is connected with a limestone slurry cyclone through a slurry circulating pump, the underflow port of the limestone slurry cyclone is connected with the inlet of the primary wet ball mill, the overflow port of the limestone slurry cyclone is connected with a distributor, the distributor is connected with the inlet of a secondary separator, the underflow port of the secondary separator is connected with the inlet of a secondary wet ball mill, the overflow port of the secondary separator is connected with a limestone slurry tank, and the limestone slurry tank is connected with an absorption tower slurry pool through an absorption tower slurry supply pump.
The invention is also characterized in that
The outlet of the secondary wet ball mill is connected with the inlet of the secondary separator through a slurry recirculation pump.
The distributor is also connected to a recirculation tank.
The invention adopts another technical scheme that a limestone slurry preparation system is adopted in the limestone slurry preparation method, and the limestone slurry preparation method is implemented according to the following steps:
step 1, conveying limestone particles and water to a primary wet ball mill for grinding, and sorting by a limestone slurry cyclone to produce a finished limestone slurry a;
and 2, automatically flowing the limestone slurry a obtained in the step 1 into a secondary separator, grinding the separated bottom sediment in a secondary wet ball mill again, returning the ground qualified limestone slurry into the secondary separator again through a slurry recirculation pump to separate coarse particles together with newly supplemented slurry, and overflowing and separating limestone slurry b with good fineness and quality in the secondary separator. The mass concentration of the limestone slurry b is 25 percent; more than 90% of the particles in the limestone slurry b are smaller than 40 μm.
The limestone slurry preparation system has the beneficial effects that the limestone slurry with unqualified fineness and quality is prevented from being conveyed to the slurry tank of the absorption tower due to the operation failure of the main slurry preparation system or the blockage of the limestone slurry cyclone and other problems, so that sediments are accumulated at the bottom of the slurry tank, and the equipment abrasion of the slurry circulation system is delayed; meanwhile, the machine set shutdown maintenance time is shortened; meanwhile, the calcium-sulfur ratio of the operation of a desulfurization system is reduced, and the cost of the absorbent is saved; better maintaining reasonable slurry residence time.
Drawings
Fig. 1 is a schematic structural diagram of a stone limestone slurry preparation system according to the present invention.
In the figure, 1, a primary wet ball mill, 2, a recirculation box, 3, a slurry circulating pump, 4, a limestone slurry cyclone, 5, a distributor, 6, a secondary separator, 7, a secondary wet ball mill, 8, a slurry recirculation pump, 9, a limestone slurry box, 10, an absorption tower slurry supply pump and 11, an absorption tower slurry pool.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention relates to a limestone slurry preparation system, which comprises a primary wet ball mill 1, wherein lime stone and water for pulping are supplemented through an inlet of the primary wet ball mill 1, and an outlet of the primary wet ball mill 1 is connected with a recirculation tank 2; the recycling tank 2 is connected with a limestone slurry cyclone 4 through a slurry circulating pump 3, the bottom flow port of the limestone slurry cyclone 4 is connected with the inlet of a primary wet ball mill 1, the overflow port of the limestone slurry cyclone 4 is connected with a distributor 5, the distributor 5 is connected with the recycling tank 2, the distributor 5 is also connected with the inlet of a secondary separator 6, the bottom flow port of the secondary separator 6 is connected with the inlet of a secondary wet ball mill 7, the outlet of the secondary wet ball mill 7 is connected with the inlet of the secondary separator 6 through a slurry recycling pump 8, the overflow port of the secondary separator 6 is connected with a limestone slurry tank 9, and the limestone slurry tank 9 is connected with an absorption tower slurry pool 11 through an absorption tower slurry supply pump 10.
The distributor 5 is used for guiding part of overflow slurry to the recirculation tank 2, so that the liquid level of the recirculation tank 2 is maintained and the slurry circulation pump 8 is prevented from idling; the overflow slurry may also be diverted to a different limestone slurry tank 9 for storage.
The purpose of the recirculation tank 2 is to continuously provide a steady flow of slurry to the slurry circulation pump 8, avoiding idling of the slurry circulation pump 8.
The slurry circulating pump 8 is used for providing enough pressure for the cyclone under the set slurry flow rate to realize the centrifugal separation effect of coarse particles and fine particles of the limestone slurry.
The secondary separator 6 can select static natural separation such as overflow sedimentation tank and return sedimentation tank, or can select mechanical centrifugal separation such as cyclone, mechanical filtration separation such as vibrating screen, etc.
The invention relates to a limestone slurry preparation system, which has the specific working principle that:
limestone particles and water are continuously conveyed into a primary wet ball mill 1 according to a certain proportion for grinding, produced limestone slurry automatically flows to a recycling tank 2, is conveyed to a limestone slurry cyclone 3 through a slurry circulating pump 3, the underflow of the limestone slurry cyclone 4 returns to the primary wet ball mill 1 for continuous grinding, the overflow automatically flows into a secondary separator 6 through a distributor 5, bottom sediment is naturally or mechanically separated and enters a secondary wet ball mill 7 for further grinding, limestone slurry produced by the secondary wet ball mill 7 is conveyed into the secondary separator 6 again through a slurry recycling pump 8, separated limestone slurry with good fineness and quality automatically flows into a limestone slurry tank 9, and finally is conveyed to an absorption tower slurry tank 11 through an absorption tower supply pump 10.
The invention relates to a limestone slurry pulping method, which is implemented according to the following steps:
step 1, conveying limestone particles and water to a primary wet ball mill 1 for grinding, and sorting by a limestone slurry cyclone 4 to produce a finished limestone slurry a;
the fineness of limestone slurry can not meet the requirement due to the problems of operation adjustment of a main pulping system, equipment failure and the like;
step 2, the limestone slurry a obtained in the step 1 automatically flows into a secondary separator 6, the separated bottom sediment enters a secondary wet ball mill 7 to be ground again, the ground qualified limestone slurry passes through a slurry recirculating pump 8 and returns to the secondary separator 6 again to be separated into coarse particles together with newly supplemented slurry, and limestone slurry b with good fineness and quality is separated out in the secondary separator 6 in an overflowing manner;
the mass concentration of the limestone slurry b is 25 percent; more than 90% of the particles in the limestone slurry b are smaller than 40 μm, which is even better than the requirement.

Claims (5)

1. The limestone slurry preparation system is characterized by comprising a primary wet ball mill (1), wherein an outlet of the primary wet ball mill (1) is connected with a recirculation box (2); recirculation case (2) are connected with limestone slurry swirler (4) through slurry circulating pump (3), the underflow opening and the wet ball mill (1) entry linkage of limestone slurry swirler (4), overflow mouth connection distributor (5) of limestone slurry swirler (4), secondary separator (6) entry is connected in distributor (5), secondary wet ball mill (7) entry is connected to the underflow opening of secondary separator (6), limestone slurry case (9) is connected to the overflow mouth of secondary separator (6), limestone slurry case (9) supplies slurry pump (10) to connect absorption tower thick liquid pond (11) through the absorption tower.
2. Limestone slurry preparation system according to claim 1, characterized in that the secondary wet ball mill (7) outlet is connected to the secondary separator (6) inlet by a slurry recirculation pump (8).
3. Limestone slurry preparation system according to claim 1, characterized in that the distributor (5) is also connected to a recirculation tank (2).
4. A method for preparing limestone slurry by using the limestone slurry preparation system as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:
step 1, conveying limestone particles and water to a primary wet ball mill (1) for grinding, and sorting by a limestone slurry cyclone (4) to produce a finished limestone slurry a;
and 2, automatically flowing the limestone slurry a obtained in the step 1 into a secondary separator (6), grinding the separated bottom sediment in a secondary wet ball mill (7) again, returning the ground qualified limestone slurry into the secondary separator (6) again through a slurry recirculation pump (8) to separate coarse particles together with newly-supplemented slurry, and overflowing and separating limestone slurry b with good fineness and quality in the secondary separator (6).
5. The limestone slurry pulping method according to claim 4, wherein the mass concentration of the limestone slurry b is 25%; more than 90% of particles in the limestone slurry b are smaller than 40 mu m.
CN202010829566.0A 2020-08-18 2020-08-18 Limestone slurry preparation system and slurry preparation method Pending CN111992321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010829566.0A CN111992321A (en) 2020-08-18 2020-08-18 Limestone slurry preparation system and slurry preparation method

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Application Number Priority Date Filing Date Title
CN202010829566.0A CN111992321A (en) 2020-08-18 2020-08-18 Limestone slurry preparation system and slurry preparation method

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CN111992321A true CN111992321A (en) 2020-11-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113499724A (en) * 2021-07-12 2021-10-15 翱华工程技术股份有限公司 Carbide slag slurry manufacturing equipment, carbide slag slurry manufacturing method and carbide slag slurry

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113499724A (en) * 2021-07-12 2021-10-15 翱华工程技术股份有限公司 Carbide slag slurry manufacturing equipment, carbide slag slurry manufacturing method and carbide slag slurry

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