Limestone slurry preparation system and limestone slurry preparation method

A limestone slurry and preparation system technology, which is applied in the field of limestone slurry preparation system, can solve the problems affecting the atomization effect of the spray layer of the slurry circulating pump, the wear of the spray layer pipeline and nozzle, and the increase of the maintenance workload of the unit, so as to shorten the Downtime maintenance time, maintenance residence time, and cost-saving effects

Pending Publication Date: 2020-11-27

NORTHWEST BRANCH OF CHINA DATANG CORP SCI & TECH RES INST +1

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Problems solved by technology

[0003] Limestone-gypsum wet desulfurization system generally has the phenomenon of sediment accumulation at the bottom of the absorption tower. Most of the sediment particles are limestone particles that do not meet the grinding requirements, and a very small part are silica crystals doped in limestone ore that are not easy to grind.

A large amount of sediment accumulates at the bottom of the absorption tower. On the one hand, during the operation of the desulfurization system, the sediment particles are repeatedly sprayed and circulated with the slurry circulation pump, which causes the lining and impeller of the slurry ci...

Abstract

The invention discloses a limestone slurry preparation system. The limestone slurry preparation system comprises a primary wet ball mill, and an outlet of the primary wet ball mill is connected with arecirculation box; and the recirculation box is connected with a limestone slurry cyclone through a slurry circulating pump, an underflow opening of the limestone slurry cyclone is connected with aninlet of the primary wet ball mill, an overflow opening of the limestone slurry cyclone is connected with a distributor, the distributor is connected with an inlet of a secondary separator, an underflow opening of the secondary separator is connected with an inlet of a secondary wet ball mill, and an overflow port of the secondary separator is connected with a limestone slurry box which 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, and 90% or more of particles in the limestone slurry of the finished product are less than 40 microns. According to the limestone slurry preparation system, limestone slurry with unqualified fineness is prevented from being conveyed to the absorption tower slurry pool, equipment abrasion of a slurry circulation system is delayed, and the calcium-sulfur ratio of operation of a desulfurization system is reduced.

Application Domain

Vortex flow apparatusDispersed particle separation +1

Technology Topic

Process engineeringBall mill +3

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[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] A limestone slurry preparation system of the present invention, such as figure 1 As shown, including a primary wet ball mill 1, through the inlet of the primary wet ball mill 1 to supplement limestone material and pulping water, the outlet of the primary wet ball mill 1 is connected to the recirculation box 2; The underflow port of the limestone slurry cyclone 4 is connected to the inlet of the primary wet ball mill 1, the overflow port of the limestone slurry cyclone 4 is connected to the distributor 5, the distributor 5 is connected to the recirculation tank 2, and the distributor 5 is also connected The inlet of the secondary separator 6, the underflow port of the secondary separator 6 is connected to the inlet of the secondary wet ball mill 7, and the outlet of the secondary wet ball mill 7 is connected to the inlet of the secondary separator 6 through the slurry recirculation pump 8, and the overflow of the secondary separator 6 is connected. The flow port is connected to the limestone slurry tank 9, and the limestone slurry tank 9 is connected to the absorption tower slurry pool 11 through the absorption tower slurry supply pump 10.

[0020] The purpose of the distributor 5 is to guide the flow, which can guide part of the overflow slurry to the recirculation tank 2, maintain the liquid level of the recirculation tank 2, and avoid the idling of the slurry circulation pump 8; it can also guide the overflow slurry to different. The limestone slurry tank 9 is stored for backup.

[0021] The purpose of the recirculation tank 2 is to continuously provide the slurry circulation pump 8 with a stable flow of slurry, so as to avoid the idling of the slurry circulation pump 8 .

[0022] The purpose of the slurry circulating pump 8 is to provide sufficient pressure for the cyclone under the set slurry flow rate to achieve centrifugal separation of coarse and fine particles of limestone slurry.

[0023] The secondary separator 6 can choose static natural separation such as overflow sedimentation tank and return sedimentation tank, or mechanical centrifugal separation such as cyclone, mechanical filtration separation such as vibrating screen, etc.

[0024] A limestone slurry preparation system of the present invention, and its specific working principle is:

[0025] The limestone particles and water are continuously transported to the primary wet ball mill 1 for grinding according to a certain ratio, and the produced limestone slurry flows to the recirculation box 2, and is transported to the limestone slurry cyclone 3 through the slurry circulation pump 3, and the limestone slurry is swirled. The bottom flow of the device 4 returns to the primary wet ball mill 1 to continue grinding, and the overflow flows through the distributor 5 to the secondary separator 6. After natural or mechanical separation, the bottom sediment enters the secondary wet ball mill 7 for further grinding. The secondary wet ball mill 7 The produced limestone slurry is transported to the secondary separator 6 again through the slurry recirculation pump 8, and the separated limestone slurry with good fineness and quality flows into the limestone slurry tank 9, and finally is transported to the absorption tower slurry through the absorption tower slurry supply pump 10. Pool 11.

[0026] A kind of pulping method of limestone slurry of the present invention is specifically implemented according to the following steps:

[0027] Step 1, the limestone particles and water are transported to the primary wet ball mill 1 for grinding, and the limestone slurry a of the finished product is produced after sorting by the limestone slurry cyclone 4;

[0028] The fineness of limestone slurry does not meet this requirement due to problems such as the operation adjustment of the main pulping system and equipment failure;

[0029] Step 2, the limestone slurry a obtained after step 1 flows into the secondary separator 6, and after separation, the bottom sediment enters the secondary wet ball mill 7 for grinding again, and the grinding qualified limestone slurry passes through the slurry recirculation pump 8, Return to the secondary separator 6 again to separate coarse particles together with the newly replenished slurry, and the overflow in the secondary separator 6 separates limestone slurry b with good fineness and quality;

[0030] The mass concentration of the limestone slurry b is 25%; more than 90% of the particles in the limestone slurry b are smaller than 40 μm, which is even better than this requirement.

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Classification and recommendation of technical efficacy words

Reduce downtime

Limestone slurry preparation system and limestone slurry preparation method

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Description & Claims & Application Information

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