CN202410312U

CN202410312U - Belt filter

Info

Publication number: CN202410312U
Application number: CN2011205227795U
Authority: CN
Inventors: 李泽清; 莫建松; 程常杰
Original assignee: Zhejiang Tianlan Environmental Protection Technology Co Ltd
Current assignee: Zhejiang Tianlan Environmental Protection Technology Co Ltd
Priority date: 2011-12-14
Filing date: 2011-12-14
Publication date: 2012-09-05
Anticipated expiration: 2021-12-14

Abstract

The utility model discloses a belt filter, belonging to the field of environment and resource protection. The belt filter comprises a vacuum pump, a steam separator, a slurry distributor, a conveyance track and a gypsum slurry inlet, wherein a first resistance reducing device, a washing water pipe and a second resistance reducing device are sequentially arranged above the conveyance track in the operation direction, the first resistance reducing device and the second resistance reducing device consist of supports and resistance reducing gears, and the resistance reducing gears are fixed on the supports and vertically extend along the conveyance track. The belt filter disclosed by the utility model is applied to dewatering treatment on gypsum cake in the belt filter so as to greatly improve the dewatering performance of the belt filter, quickly dewater gypsum to the maximum extent and improve the quality of gypsum.

Description

A kind of band filter

Technical field

The utility model relates to resource and field of environment protection, is specifically related to a kind of band filter.

Background technology

That has used on the desulphurization market at home at present, has more than 10 kind of flue gas desulfurization technique technology such as limestone-gypsum method, flue gas circulating fluidized bed method, sea water desulfuration method.Wherein, the limestone-gypsum method flue gas desulfurization technology is still main flow, puts into operation, in the flue gas desulphurization project of building and having signed a contract, and this technology proportion reaches more than 90%.It is desulfurizing agent that the limestone-gypsum sulfur removal technology mainly adopts natural limestone; The levigate mass content of processing of natural limestone is sent in the absorption tower at the lime stone slurry of 10%-15%, and former boiler smoke gets into the absorption tower and is entered atmosphere by the clean flue gas in lime stone slurry washing absorption back from chimney.

Limestone-gypsum method has technical maturity, advantage such as stable, but has consumed a large amount of natural limestone resources.The main component CaCO of lime stone ₃Be the indissoluble material, dissolution rate is slower, if SO in the flue gas ₂Excessive concentration then needs bigger liquid-gas ratio and bigger absorption tower volume, has increased the cost of investment and the operating cost of wet desulphurization.

Carbide slag is mainly derived from generated by polyvinyl chloride by calcium carbide and vinyl acetate production.The main component of carbide slag is Ca (OH) ₂, have extremely strong alkalescence, Ca in the carbide slag (OH) ₂Content more than 90%, secondly be Al ₂O ₃, SiO ₂, MgO, carbon granule, phosphide, sulfide etc.Ca (OH) ₂Solubility much larger than CaCO ₃Solubility, have higher rate of dissolution, can well adapt to high concentration SO ₂Flue gas.Compare with the lime lime-gypsum method, carbide slag gypsum method has the wider flue gas scope of application, and has reduced the operation energy consumption of desulphurization system.

White clay is the paper industry solid slag.After black liquor concentrate to burn between papermaking alkali recovery vehicle, the fused mass main component that flows out from the combustion furnace bottom was sodium carbonate and vulcanized sodium, be dissolved in rare white liquid after; Become green liquor,, add calcium hydroxide at caustic room; Make sodium carbonate be converted into NaOH, be settled out calcium carbonate simultaneously and be called white clay.The main component of white clay is a calcium carbonate, secondly is Al ₂O ₃, SiO ₂, MgO, CaO, Na ₂S etc.White clay also has stronger alkalescence because alkalinity is higher, and the butt alkalinity is mainly soda about 4%, and its pH value of solution is more than 9.Owing to contain a large amount of sodium ions in the white clay, increased the rate of dissolution of calcium carbonate in the white clay greatly, also can better adapt to high concentration SO ₂Flue gas, the investment operating cost of reduction desulphurization system.

Carbide slag, white clay are industrial object waste pollutant, have stronger alkalescence, and carbide slag, white clay replace lime stone are used for wet desulphurization, reduce the lot of consumption of natural limestone resource, can better adapt to the SO of variable concentrations ₂Flue gas, and the purpose of the realization treatment of wastes with processes of wastes against one another.But all contain Al in carbide slag and the white clay ₂O ₃, SiO ₂, material such as coke, Al in the desulphurization system running ₂O ₃, SiO ₂, material such as coke can be discharged in the surface and the inside of carbide slag, white clay particle; And in the slurries system, generate aluminium hydroxide, silicate, coke isocolloid shape amalgam; These gluey amalgam materials are slowly enrichment and finally slagging tap through the band filter with gypsum slurries in inside, absorption tower, and is taken out of desulphurization system.In the gypsum tapping process; These gluey amalgam materials can form the fine and close adhesive film of one deck in gypsum surface; Greatly reduce the dewatering of the gas permeability of gypsum, the suction filtration resistance that has increased gypsum patty will, reduction band filter, thereby cause the gypsum moisture content higher.Because the moisture in the gypsum patty will contains the heavy metal ion of higher concentration, if can not remove the practical value that can reduce gypsum greatly.

The utility model content

The utility model provides a kind of band filter, improves the dewatering of band filter greatly, makes gypsum dehydration to greatest extent fast, improves the quality of gypsum.

A kind of band filter; Comprise vavuum pump, steam-water separator, grout distribution device, carry crawler belt and gypsum slurries inlet; Carry the crawler belt top to be provided with successively first to fall the resistance device along its traffic direction, the resistance device falls in washing pipe and second, described first falls resistance device and second falls the resistance device by support and be fixed on the support and form towards the tooth of coming down to a lower group of carrying crawler belt vertically to extend.

Described first falls the resistance device is positioned at the place apart from gypsum slurries inlet 1.2-1.5m; Described first fall the resistance device to fall resistance tooth space width be 8-12cm.Fall the height that hinders tooth through adjusting, make it can puncture gypsum patty will 3-5mm, the gluey body thin film of the mixing on gypsum patty will surface is punctured, reduce the filtration resistance of gypsum patty will greatly, the water content of gypsum patty will is reduced greatly.

Described washing pipe is positioned at the place apart from gypsum slurries inlet 2.2-2.5m; The gypsum patty will moisture content here is lower; Probably between 14-18%, just can play clean result preferably with a small amount of flushing water, the small-sized nozzle of fresh water (FW) on spray header is sprayed to above the gypsum patty will; The new moisture that sprays passes the gypsum patty will layer rapidly under the vavuum pump suction filtration, play the effect of washing gypsum patty will.When washing water-spraying amount 30-70 liter/ton hour, gypsum there is clean result preferably, heavy metal ion, chlorion, fluorine ion etc. are rinsed water with major part and take away in the gypsum patty will in this process, have improved the quality of gypsum.

Described second falls the resistance device is positioned at the place apart from washing pipe 0.5-0.8m; Described second fall the resistance device to fall resistance tooth space width be 5-8cm.Gypsum patty will is through the spray irrigation of washing pipe; Part colloidal mixture matter can cover gypsum patty will again under the flushing current are always used surface falls the height that falls the resistance tooth that hinders device through regulating second then, it is punctured make it can puncture gypsum patty will 5-8mm; Second falls falling of resistance device hinders the tooth comparatively dense; Can better tear the gluey amalgam film on gypsum patty will top layer, improve the water separation capability of band filter greatly, make gypsum dehydration to greatest extent rapidly.

The beneficial effect of the utility model:

Be provided with first above the filter at band and fall that the resistance section falls in the resistance device, middle washing pipe purge zone and second is fallen the resistance device and fallen the resistance section; Fall the resistance device and puncture the dense film that the colloidal mixture that produces in carbide slag/white clay sweetening process forms on the gypsum patty will top layer; The gas permeability that increases gypsum patty will improves the water separation capability of band filter; Purge zone is utilized fresh water (FW) washing gypsum patty will; Remove heavy metal ion in the gypsum patty will, chlorion, fluorine ion etc., reduced gypsum processing cost, improved the use value of gypsum.

Description of drawings

Fig. 1 is the structural representation of the utility model.

The specific embodiment

As shown in Figure 1; A kind of band filter, the band filter is a vacuum crawler type band filter, comprises the gypsum slurries inlet; Be positioned at the conveying crawler belt 2 in gypsum slurries inlet downstream; Carry the steam-water separator 4 of crawler belt 3 belows, the vavuum pump 2 that is communicated with the gypsum slurries inlet; Carry crawler belt 2 above be equipped with first successively along its traffic direction and fall resistance device 5, washing pipe 6 and second and fall resistance device 7, the first and fall resistance device 5 and second and fall resistance device 7 by support and be fixed on the support towards the teeth composition of coming down to a lower group of carrying crawler belt 2 vertically to extend.

First falls resistance device 5 is installed in 1.2m place, gypsum slurries porch, falls the resistance tooth perpendicular to the traffic direction of carrying crawler belt 2, and the space width of the tooth of coming down to a lower group is 10cm; Washing pipe 6 is arranged on the place apart from gypsum slurries inlet 2.3m, 60 liters/ton of the washing water-spraying amount of gypsum; Second falls resistance device 7 is installed in the 0.6m place apart from washing pipe 6, falls the resistance tooth perpendicular to the traffic direction of carrying crawler belt 2, and the space width that falls the resistance tooth is 6cm.

First falls the height that resistance device 7 falls in resistance device 5 and second can regulate as required, regulate first the resistance device falls and the height that falls the resistance tooth makes it can puncture gypsum patty will 5mm, regulate second the resistance device falls and the height that hinders tooth that falls makes it can puncture gypsum patty will 8mm.

Principle of the utility model and technological process:

The band filter is under the suction function of vavuum pump 3; Filter cloth is adsorbed on the conveying crawler belt 2; Gypsum slurries is pumped to above the filter cloth of band filter through gypsum, and grout distribution device 1 is tiled in gypsum slurries on the filter cloth, and gypsum patty will is divided into three layers under the gravity effect: bottom is a gypsum; The intermediate layer is aluminium hydroxide, silicate, coke isocolloid shape amalgam, and the upper strata is the aqueous solution.Under the vacuum filtration effect of vavuum pump 3, rotate; Filter cloth is with carrying crawler belt 2 to move forward, and equally distributed gypsum slurries filters through filter cloth under the draft of vavuum pump 3 on the filter cloth, and moisture passes filter cloth entering steam-water separator 4 to be separated; The gypsum crystal particle is trapped within the gypsum patty will that the filter cloth top forms the 2-5 cm thick; This moment, colloid layer was condensed into the fine and close film of one deck gradually on the gypsum top layer, had increased the suction filtration resistance of gypsum patty will greatly, fell resistance device 5 places when gypsum patty will moves to first; The fine and close colloidal film on gypsum patty will top layer is fallen the resistance tooth that falls that hinders device 5 by first and tears the gas permeability that has increased gypsum patty will, makes that the gypsum moisture content continues to descend.

The gypsum patty will of tearing the top layer has good gas permeability and water penetration; Under the spray irrigation effect of washing pipe 6; The plurality of heavy metal ion of gypsum particle surface attachment, chlorion, fluorine ion etc. are diluted; Most of ion finally is rinsed water and takes gypsum patty will out of, has reduced the harmful substance in the gypsum.Gypsum patty will is through after washing; Under the effect of flushing water; The colloidal substance part on top layer can cover the gypsum top layer again, in order to reduce the moisture content of gypsum as far as possible, increases by second at 0.6 meter apart from wash tub pipe 6 and falls resistance device 7; Increase and fall the space width density that the resistance tooth falls in the resistance device, make gypsum patty will to be dewatered to greatest extent.

Claims

1. be with filter for one kind; Comprise vavuum pump (3), steam-water separator (4), grout distribution device (1), carry crawler belt (2) and gypsum slurries inlet; It is characterized in that; Carry crawler belt (2) top to be provided with successively first to fall resistance device (5) along its traffic direction, resistance device (7) falls in washing pipe (6) and second, described first falls resistance device (5) and second falls resistance device (7) by support and be fixed on the support and form towards the tooth of coming down to a lower group of carrying the vertical extension of crawler belt (2).

2. band filter according to claim 1 is characterized in that, described first falls resistance device (5) is positioned at the place apart from gypsum slurries inlet 1.2-1.5m.

3. band filter according to claim 1 and 2 is characterized in that, described first fall resistance device (5) to fall resistance tooth space width be 8-12cm.

4. band filter according to claim 1 is characterized in that, described washing pipe (6) is positioned at the place apart from gypsum slurries inlet 2.2-2.5m.

5. band filter according to claim 1 is characterized in that, described second falls resistance device (7) is positioned at apart from washing pipe (6) 0.5-0.8m place.

6. according to claim 1 or 5 described band filters, it is characterized in that, described second fall resistance device (7) to fall resistance tooth space width be 5-8cm.