CN104028041B - A kind of subparticle liquid-solid separation device - Google Patents

A kind of subparticle liquid-solid separation device Download PDF

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Publication number
CN104028041B
CN104028041B CN201410318241.0A CN201410318241A CN104028041B CN 104028041 B CN104028041 B CN 104028041B CN 201410318241 A CN201410318241 A CN 201410318241A CN 104028041 B CN104028041 B CN 104028041B
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plate
liquid
subparticle
thickener
connects
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CN104028041A (en
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吴嘉乐
田克胜
徐日升
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China Haisum Engineering Co Ltd
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China Haisum Engineering Co Ltd
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Abstract

The invention provides a kind of subparticle liquid-solid separation device, comprise thickener, thickener top connects clear liquid groove, connects medial launder bottom thickener; Medial launder connects plate and frame filter press by filter pressing pump, and the liquid outlet of plate and frame filter press connects clear liquid groove, and clear liquid groove connects reservoir at the bottom of absorbing tower by solution pump.Device provided by the invention overcomes the deficiencies in the prior art, enter the subparticle in absorbing liquid with flue gas after can removing calcium and sodium double alkali method desulfurizing, dependable performance, by thickener, slurry solid content is thickened to 10% ~ 20% from 1% ~ 2%, then in filter-pressing device, subparticle is filtered out, improve operating efficiency high, energy-conserving and environment-protective, also reduce the cost of sulfur removal technology simultaneously, be conducive to the continuous reliability service of desulfurizer.

Description

A kind of subparticle liquid-solid separation device
Technical field
The present invention relates to a kind of device disposed by the subparticle entered in absorbing liquid with flue gas after calcium and sodium double alkali method desulfurizing, belong to environmental chemical engineering technical field.
Background technology
During the desulfurization such as the regenerated flue gas of fire coal boiler fume, chemical industry, the subparticle carried secretly in flue gas can enter in absorbing liquid.Calcium and sodium double alkali method desulfurizing is conventional a kind of sulfur removal technology, and in calcium and sodium double alkali method desulfurizing technology, soda absorbing liquid adopts limestone vegetation and after regenerating, contains calcium sulfite (CaSO in the soda absorbing liquid of regeneration 3.1/2H 2o), calcium sulfate (also known as gypsum, CaSO 4.2H 2o), the impurity such as flue dust and lime.In the soda suspension of general regeneration, solid content is 1% ~ 2%.
In prior art, absorbing liquid adopts the technique recycled, but due to absorbing liquid treatment process imperfection, or selected device efficiency is low, causes the subparticles such as flue dust constantly to accumulate in absorbing liquid, after running a period of time, just needs to change whole absorbing liquid.The discharge of absorbing liquid not only can produce secondary pollution, also improves the operating cost of calcium and sodium double alkali method desulfurizing.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of device disposed by the subparticle entered in absorbing liquid with flue gas after calcium and sodium double alkali method desulfurizing.
In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide a kind of subparticle liquid-solid separation device, it is characterized in that: comprise thickener, and thickener top connects clear liquid groove, connects medial launder bottom thickener; Medial launder connects plate and frame filter press by filter pressing pump, and the liquid outlet of plate and frame filter press connects clear liquid groove, and clear liquid groove connects reservoir at the bottom of absorbing tower by solution pump.
Preferably, agitating device is provided with in described medial launder.
Preferably, described thickener is inclined plate settler.
Preferably, described inclined plate settler is rectangular configuration, can the inclined plate settler module of isolated operation or flushing form by 2 ~ 6.
Preferably, in described inclined plate settler module, swash plate and horizontal direction angle are 60 °.
Preferably, the distance between plates of described inclined plate settler module is 35 ~ 50mm, and swash plate height is 0.8 ~ 1.2m, and swash plate surface loading is 1.6 ~ 2m 3/ (m 2.h), swash plate sheet metal thickness is 2 ~ 3mm.
Preferably, the centrifugal pump of described filter pressing pump to be lift be 60m.
Preferably, the operating pressure of described plate and frame filter press is 0.6MPa, the material anti-chlorine ion corrosion of described plate and frame filter press.
Preferably, the filter cake thickness of described plate and frame filter press is 10 ~ 20mm.
When subparticle liquid-solid separation device provided by the invention uses, the slurries containing subparticle deliver to thickener by slush pump, and the overflowing liquid overflow after clarification is to clear liquid groove, and the underflow liquid after thickening flows into medial launder.Agitating device is provided with, to prevent deposition of solid in medial launder.Underflow liquid in medial launder delivers to plate and frame filter press press filtration through filter pressing pump, and filter cake is transported by truck, and filtrate overflow is to clear liquid groove, and the liquid in clear liquid groove returns to reservoir at the bottom of absorbing tower by solution pump, in order to recycling.
Device provided by the invention overcomes the deficiencies in the prior art, enter the subparticle in absorbing liquid with flue gas after can removing calcium and sodium double alkali method desulfurizing, dependable performance, by thickener, slurry solid content is thickened to 10% ~ 20% from 1% ~ 2%, then in filter-pressing device, subparticle is filtered out, improve operating efficiency high, energy-conserving and environment-protective, also reduce the cost of sulfur removal technology simultaneously, be conducive to the continuous reliability service of desulfurizer.
Accompanying drawing explanation
Fig. 1 is subparticle liquid-solid separation device schematic diagram provided by the invention;
Fig. 2 is inclined plate settler schematic diagram;
Fig. 3 is M-M sectional view in Fig. 2.
Detailed description of the invention
For making the present invention become apparent, hereby with a preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Fig. 1 is subparticle liquid-solid separation device schematic diagram provided by the invention, and described subparticle liquid-solid separation device comprises thickener S101, and thickener S101 top connects clear liquid groove V102, connects medial launder V101 bottom thickener S101.Medial launder V101 connects plate and frame filter press PF101 by filter pressing pump P102, and the liquid outlet of plate and frame filter press PF101 connects clear liquid groove V102, and clear liquid groove V102 connects reservoir V103 at the bottom of absorbing tower by solution pump P103.
In calcium and sodium double alkali method desulfurizing technology, containing flue dust, lime impurity, calcium sulfate, calcium sulfite etc. in mixed liquor after regeneration of absorption solution, the slurries ML containing these subparticles is needed to deliver to thickener S101 by slush pump P101, overflowing liquid overflow after clarification is to clear liquid groove V102, and the underflow liquid after thickening flows into medial launder V101.Agitating device is provided with, to prevent deposition of solid in medial launder V101.Underflow liquid in medial launder V101 delivers to plate and frame filter press PF101 press filtration through filter pressing pump P102, filter cake FC is transported by truck, filtrate overflow is to clear liquid groove V102, and the liquid in clear liquid groove V102 returns to reservoir V103 at the bottom of absorbing tower, in order to recycling by solution pump P103.
For ammonia desulfurizing process, because the content of flue dust is low, reach 1% also can not affect desulfurization even if flue dust accumulates solid content in systems in which, so without the need to arranging thickener, a part of solution directly being delivered to plate and frame filter press press filtration, can subparticle be removed.This method is the solid content of flue dust in initialization system, determines the suspension treating capacity delivering to filter press thus.After one-phase runs, make the subparticle amount that enters in sweetening process in ammonia absorbing liquid equal with the subparticle amount that filter press removes, the solid content in such ammonia absorbing liquid would not improve, and thus eliminates the continuous accumulation of flue dust in absorbing liquid.
To calcium and sodium double alkali method desulfurizing technology, for reducing the amount of solution delivering to plate and frame filter press, to control the filtration time of plate and frame filter press, thickener is provided with in the present invention, regenerated suspension is delivered to thickener thickening, solid content in its solution is thickened to 10% ~ 20% by 1% ~ 2%, then goes press filtration.
Thickener S101 and plate and frame filter press PF101 is two capital equipments in subparticle liquid-solid separation device provided by the invention.
1, thickener
Thickener is a kind of continuous sedimentation device, and it mainly considers the sinking speed of particle.Such as calcium sulfite (CaSO 3.1/2H 2o) it is of a size of the flat crystal of (3 ~ 5 μm) × (10 ~ 20 μm), and be equivalent to the particle of 5 ~ 10 μm of sizes, its sinking speed and sedimentation time are as following table:
In vertical-flow settler, in 5 μm of particle diameters, settling height 1000mm needs 8.34h, so will reach requirement, settling area must be very large.For improving settling efficiency, adopt inclined plate settler, due to the compactedness of process unit of its composition, so a very large settling area can be provided in a less volume, because herein is provided the efficient means of a process intensification.Such as, in subparticle sedimentation, select the distance between plates of swash plate to be 50mm, then its settling height is 100mm, and the required sedimentation time is 0.834h, and thus inclined plate settler is compared its efficiency of vertical-flow settler and generally improved 8 ~ 10 times.
In addition, although inclined plate settler and inclined tube settler are high-efficiency sedimentation device, when applying in desulfurization, as calcium sulfite, it has certain adhesiveness, is deposited on swash plate, therefore needs periodic flushing so swash plate just has calcium sulfite after certain hour runs.From easy to clean, inclined plate settler is better than inclined tube settler.
Composition graphs 2, inclined plate settler adopts rectangular configuration, it can be formed (adopting I, II, III, IV4 block combiner in Fig. 2) by 2 ~ 6 inclined plate settler module assembleds, be beneficial to rinse and run be used alternatingly, and water flushing device is set, each module all can carry out separately running or rinsing, and does not affect the operation of whole regenerative system.During rectangular configuration, also comparatively circular configuration is reasonable for the layout of swash plate module.In addition, in swash plate module, swash plate and horizontal direction angle α (inclination angle) are 60 °.
Composition graphs 3, inclined plate settler is made up of the section of protection A, supernatant layer B, swash plate C, cushion D and mud section E, and inclined plate settler vibrational power flow is as follows:
2, plate and frame filter press
Subparticle suspension needs to adopt filter-pressing method to be separated by subparticle, the selection of general filter is when domain size distribution is wide, mainly by the impact of subparticle concentration, such as, be greater than 10 μm of particles in suspension when being no more than 10%, need to adopt pressure filtration.
For reducing the flow of press filtration suspension, generally by the solid concentration thickening of suspension, then filter.
If the filtrability of subparticle is poor, can filter aid be added, as diatomite, perlite, flyash or spent lime, to change the character of suspension, make suspension have character desired by applicable lock out operation.Such as, in magnesium oxide method sulfur removal technology, the magnesian content of desulfurizing agent is 70% ~ 80%, therefore containing impurity 20% ~ 30%, generating magnesium sulfate through aeration after magnesia FGD, when discharging Adlerika, needing first impurity, flue dust etc. in plate and frame filter press removing magnesia.For improving strainability, select to add filter aid diatomite.
The operating pressure of plate and frame filter press is 0.6MPa, material anti-chlorine ion corrosion.According to filter medium characteristic and fine grain size, select filter cake thickness on filter cloth, determine the filter area of sheet frame thus, general filter cake thickness is 10 ~ 20mm.
In addition, be also important, generally select centrifugal pump in the selection of filter pressing pump P102, its lift is 60m.
The advantage of subparticle liquid-solid separation device is:
(1) desulfurizer and absorbing liquid post processing reliable, absorbing liquid without the need to change, general continuous operation only need supplement remove SO 2molal quantity 10% ~ 15% soda amount, therefore operating cost is low.
(2) thickener is improved by the solid content in liquid, to reduce the liquid measure of filtering required process.General thickener overflow liquid measure is 80% of import liquid measure, and underflow liquid measure is 20% of import liquid measure, therefore the filtration time of plate and frame filter press can be reduced, this is that filtrability is poor, after filter cake reaches certain thickness because calcium sulfite is subparticle, filtration becomes difficulty, filtration time can be multiplied, so during subparticle solid-liquor separation, usually all needs to set up efficient thickener.
(3) according to particle diameter and the performance of subparticle, the design parameter of choose reasonable thickener and plate and frame filter press, can guarantee desulfurizer reliability of operation.

Claims (5)

1. a subparticle liquid-solid separation device, it is characterized in that: comprise thickener (S101), thickener (S101) top connects clear liquid groove (V102), and thickener (S101) bottom connects medial launder (V101); Medial launder (V101) connects plate and frame filter press (PF101) by filter pressing pump (P102), the liquid outlet of plate and frame filter press (PF101) connects clear liquid groove (V102), and clear liquid groove (V102) connects reservoir at the bottom of absorbing tower (V103) by solution pump (P103);
Thickener (S101) is inclined plate settler; Inclined plate settler is rectangular configuration, can the swash plate module of isolated operation or flushing form by 2 ~ 6; In swash plate module, swash plate and horizontal direction angle are 60 °;
The distance between plates of inclined plate settler module is 35 ~ 50mm, and swash plate height is 0.8 ~ 1.2m, and swash plate surface loading is 1.6 ~ 2m 3/ (m 2.h), swash plate sheet metal thickness is 2 ~ 3mm.
2. a kind of subparticle liquid-solid separation device as claimed in claim 1, is characterized in that: be provided with agitating device in described medial launder (V101).
3. a kind of subparticle liquid-solid separation device as claimed in claim 1, is characterized in that: described filter pressing pump (P102) for lift be the centrifugal pump of 60m.
4. a kind of subparticle liquid-solid separation device as claimed in claim 1, is characterized in that: the operating pressure of described plate and frame filter press (PF101) is 0.6MPa, the material anti-chlorine ion corrosion of described plate and frame filter press (PF101).
5. a kind of subparticle liquid-solid separation device as described in claim 1 or 4, is characterized in that: the filter cake thickness of described plate and frame filter press (PF101) is 10 ~ 20mm.
CN201410318241.0A 2014-07-04 2014-07-04 A kind of subparticle liquid-solid separation device Active CN104028041B (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201324569Y (en) * 2008-12-19 2009-10-14 鞍山钢铁集团公司 Steel tailing mud treating system
CN101716439A (en) * 2009-12-18 2010-06-02 中国铝业股份有限公司 Method for dehydrating micro-particle slurry
CN101905099A (en) * 2009-06-04 2010-12-08 唐山市滦河鑫丰矿业有限公司 Tailing treatment method and system
CN102284210A (en) * 2011-05-31 2011-12-21 神华集团有限责任公司 Method for separating and filtering molecular sieve crystallization slurry
CN203556204U (en) * 2013-11-01 2014-04-23 中国海诚工程科技股份有限公司 Impurity elimination module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201324569Y (en) * 2008-12-19 2009-10-14 鞍山钢铁集团公司 Steel tailing mud treating system
CN101905099A (en) * 2009-06-04 2010-12-08 唐山市滦河鑫丰矿业有限公司 Tailing treatment method and system
CN101716439A (en) * 2009-12-18 2010-06-02 中国铝业股份有限公司 Method for dehydrating micro-particle slurry
CN102284210A (en) * 2011-05-31 2011-12-21 神华集团有限责任公司 Method for separating and filtering molecular sieve crystallization slurry
CN203556204U (en) * 2013-11-01 2014-04-23 中国海诚工程科技股份有限公司 Impurity elimination module

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