CN206473868U - A kind of Scroll-tupe buck light-dark separation device - Google Patents

Abstract

The utility model provides a kind of Scroll-tupe buck light-dark separation device, and the air-coal separating of wet electrical dust precipitator buck can be realized in the case where not influenceing raw water matter, and concentrated water drainage is small, and operation consumption is low, and simple in construction, cost is relatively low.Scroll-tupe buck light-dark separation device of the present utility model, including the buffer tank with sewage draining exit, the buffer tank is the cylindrical shape that barrel dliameter is more than predetermined value, and the side wall on its top offers the overfall of fresh water, side wall in the middle part of it offers the water inlet connected with water inlet pipe, the water inlet pipe is used to convey pending buck, and the pending buck is introduced into the water inlet in freely overboard form, the water inlet direction of the water inlet is consistent with the direction of the Coriolis inertia force of the pending buck.

Description

A kind of Scroll-tupe buck light-dark separation device

Technical field

The utility model is related to technical field of waste water processing, more particularly to a kind of Scroll-tupe buck light-dark separation device.

Background technology

Because wet electrical dust precipitator (hereinafter referred to as wet electricity) is often the terminal as power plant's atmosphere pollution comprehensive regulation Suspended particle in accurate process equipment, its buck is extremely trickle, when entrance solubility is less than 50mg/Nm³When, 90% suspension Particle diameter is less than 10 μm, and concentration of suspension reaches more than 2000mg/l, when entrance solubility is less than 30mg/Nm³When, 90% suspension Particle diameter is less than 5 μm, and concentration of suspension reaches more than 1000mg/l.Therefore the desalt processing of this high concentration super fine granule suspension Relative difficulty, equipment cost is high.

There are a variety of suspension desalt processing devices in prior art, be summed up the suspension for mainly having following a few quasi-representatives Thing desalt processing device：1st, sedimentation basin；2nd, electric flocculation；3rd, mechanical interception is filtered；4th, cyclonic separation.

The prior art mainly traditional water process mode of use, although presence is set with certain operational effect, but Standby cost is high, and floor space is big, system complex, the big shortcoming of maintenance.It is now as follows to above-mentioned four classes device analysis：

1st, sedimentation basin：Because the suspended particle in wet electrical dust precipitator buck is superfine, settling velocity is minimum, only 15 μm/s, if Without flocculant Accelerated subsidence, its occupied ground area extremely huge will could meet wet electric cycling use of water requirement, and add Equipment and operating cost are not only added after flocculant, other soluble-salt compositions in recirculated water is also add, changes original There is water quality, reduce the circulating ratio of wet electricity water, wet electric draining adds additional flocculant composition can not also be by wet desulphurization Reuse.

2nd, electric flocculation：The suspension of electric flocculation removes the same sedimentation basin of principle, simply instead of and adds by the method for electric flocculation Plus chemical floc, but high-pressure electronic flocculation generator need to be increased, it is added significantly to equipment cost and power consumption cost.

3rd, mechanical interception is filtered：What is be relatively applicable at present is high-precision backwashing automatic filter, but due to wet-esp Suspended particle is thin in device buck, and filtering water is big, and is corrosive, and causes automatic filter equipment cost higher, because of filtering Precision is high, to ensure that backwash dynamics needs higher hydraulic pressure to ensure, causes feed pump energy consumption higher.

4th, cyclonic separation：The general principle of cyclone is by the liquid-liquid with certain density contrast, liquid-solid, liquid-gas etc. two Phase or multiphase mixture are separated under the influence of centrifugal force.Mixed liquor is tangentially entered into cyclone with certain pressure, High speed rotational flow field is produced in cylindrical cavity, the big component of mixture Midst density is axially simultaneously transported downwards in the presence of eddy flow field It is dynamic, move radially outwards, moved downward reaching cone segments along wall, and discharged by underflow opening, material is thus formed outward turning Vortex field；The small component of density is moved to central axial direction, and the inside vortex moved upwards in axis centre formation one, then Discharged by overfall, thus reached the purpose of two-phase laminated flow.Cyclone is divided into desander by the size of partition size, desilted Device, microclone, partition size are smaller, and the nominal diameter of cyclone is smaller, and processing water is also smaller, for wet-esp The grey aqueous suspension particle diameter situation of device, only microclone can be applicable reluctantly, but when wet electrical dust precipitator entrance solubility is less than 30mg/Nm³When, 90% suspension particle diameter is less than 5 μm, and 50% suspension particle diameter is less than 2.5 μm, microclone also without Method is separated.Moreover, the processing water very little of microclone, when meeting the requirement of wet electrical dust precipitator buck big yield, its Equipment cost is also very high, and to reach less than 5 μm of partition size, and its intake pressure is also at a relatively high, pump energy consumption cost also phase It should raise；The underflow displacement accounting of cyclone is very big simultaneously, and the wastewater flow rate of wet electrical dust precipitator can be caused to increase, therefore eddy flow Device is not suitable for the Ash Water Separator operating mode of wet electrical dust precipitator yet.

Therefore, a kind of Scroll-tupe buck light-dark separation device of design is needed badly, preferably to meet the ash of wet electrical dust precipitator Water separates demand.

Utility model content

The purpose of this utility model is to provide a kind of Scroll-tupe buck light-dark separation device, can not influence raw water matter In the case of realize the air-coal separating of wet electrical dust precipitator buck, and concentrated water drainage is small, and operation consumption is low, simple in construction, into This is relatively low.

To achieve the above object, the utility model provides a kind of Scroll-tupe buck light-dark separation device, including with row The buffer tank of dirty mouth, the buffer tank is the cylindrical shape that barrel dliameter is more than predetermined value, and the side wall on its top offers fresh water Overfall, the side wall in the middle part of it offers the water inlet connected with water inlet pipe, and the water inlet pipe is used to convey pending buck, And the pending buck is introduced into the water inlet in freely overboard form, the water inlet direction of the water inlet is treated with described The direction for handling the Coriolis inertia force of buck is consistent.

The utility model utilizes spiral vortex type separation principle, and making full use of gravity stream, freely overboard formed owes power source so that Pending buck is run in the case where owing power, and the interior media of buffer tank is in the unstable state that current rotating speed gradually weakens； Now, because feed is short of power, the rotational flow of buffer tank reclaimed water will be tapered off, in the friction of buffer tank inwall Under power effect, the water close to buffer tank edge will slow down and stop motion at first, and the water in buffer tank center will Finally slow down, i.e., the pending buck into buffer tank diametrically has current gradient；Can according to Bernoulli Jacob's flow equation Know, the radial pressure of buffer tank causes heavier suspension to central motion, i.e., principle of the present utility model and cyclone Separation principle is completely contradicted.

Using above-mentioned principle, on the one hand the utility model causes the barrel dliameter of buffer tank to be more than predetermined value, to cause barrel dliameter It is sufficiently large, it is easier to so that pending buck obtains the unstable state that current rotating speed gradually weakens, to be easy to weight particle to buffering The central motion of water tank, and gather in the presence of own wt to centre bottom, in natural subsidence and the double action of whirlpool It is lower to form obvious deep or light layering, reach separating effect；On the other hand, it is freely overboard as deficient power source by the use of gravity stream, with So that pending buck with less initial velocity flow into buffer tank in, without setting feed pump, not only saved the energy, also for Good dynamic foundation has been established in the sedimentation of the utility model suspension；Furthermore, water inlet is opened in the middle part of buffer tank, Overfall is opened in the top of buffer tank, and pending buck enters buffer tank with less initial velocity and carries out owing power in addition Operation so that the inflow of pending buck will not disturb the fresh water that top overflow is formed, in order to avoid suspension in increase fresh water Content；Meanwhile, water inlet is unlikely to too high, is unfavorable for suspended substance sedimentation to avoid the resistance of bottom excessive, water inlet It is unlikely to too low, so that the effect of the sedimentation and whirlpool for suspension provides enough spaces；Especially, the utility model has Effect make use of Coriolis inertia force so that water inlet direction and the direction of the inertia force are substantially uniform, and then utilize the inertia force So that suspension natural subsidence, without being additionally provided rotary power, reduce further energy cost, also suspension is complied with Inertia force is acted, it is to avoid the disturbance inside buffer tank, is more beneficial for suspension and is fully settled, and improves separative efficiency, reduction Suspension content in fresh water.

Alternatively, the water inlet is opened in the tangential of the buffer tank, and guides the water inlet direction to tilt down, To cause the water inlet direction consistent with the direction of the Coriolis inertia force of the pending buck.

Alternatively, the water inlet is square, and the water inlet pipe is round tube, and the water inlet pipe passes through with the water inlet Circumference section connection.

Alternatively, the cross-sectional area of the water inlet is equal with the cross-sectional area of the water inlet pipe.

Alternatively, the overfall is the rectangular opening of wide and flat shape.

Alternatively, the coefficient of friction of the inwall of the buffer tank is more than pre-determined factor.

Alternatively, the bottom of the buffer tank is back taper, and cone angle is more than or equal to 150 degree.

Alternatively, the sewage draining exit is at the cone angle of the bottom of the buffer tank.

Alternatively, the sewage draining exit is communicated with blow-off pipe, is delivered to the concentrated water after processing with will pass through the blow-off pipe Wet desulfurization system is used as process water；And/or, the overfall is communicated with overflow pipe, for the fresh water that overflow goes out to be delivered to Wet electrical dust precipitator is recycled.

Alternatively, the water inlet pipe is not less than the overfall for introducing the entrance of the pending buck, and described There is predetermined height difference between entrance and the overfall.

Brief description of the drawings

Fig. 1 provides a kind of structure of the Scroll-tupe buck light-dark separation device in embodiment by the utility model Schematic diagram；

Fig. 2 is the top view of Scroll-tupe buck light-dark separation device shown in Fig. 1.

In Fig. 1-2：

Sewage draining exit 1, buffer tank 2, overfall 3, water inlet pipe 4, entrance 41, water inlet 5, circumference section 6, blow-off pipe 7, overflow Pipe 8.

Embodiment

The utility model provides a kind of Scroll-tupe buck light-dark separation device, can be in the case where not influenceing raw water matter The air-coal separating of wet electrical dust precipitator buck is realized, and concentrated water drainage is small, operation consumption is low, and simple in construction, cost is relatively low.

Below in conjunction with accompanying drawing, the utility model is specifically introduced, so as to this reality of those skilled in the art's accurate understanding With new technical scheme.

It is as described herein up and down using Scroll-tupe buck light-dark separation device normal operating condition as reference, it is normal in use, It is above-below direction perpendicular to the direction on ground, is upper away from the direction on ground under the direction for pointing to ground is.

It is as described herein radially, axially, it is circumferential etc. with buffer tank 2 be reference, buffer tank 2 is cylindrical shape, then this delays The circular direction of waste preventer 2 is circumference, and the bearing of trend of axis is axial direction, in the horizontal plane perpendicular to axial direction, with Circumferential vertical direction is radially.In the utility model, approximately axially it is equal to above-below direction.

As depicted in figs. 1 and 2, the utility model provides a kind of Scroll-tupe buck light-dark separation device, including cylindrical shape Buffer tank 2, and its barrel dliameter be more than predetermined value；The buffer tank 2 is provided with sewage draining exit 1, overfall 3 and water inlet 5, wherein, Overfall 3 is located at the side wall on top, and water inlet 5 is located at the side wall at middle part, and sewage draining exit 1 is arranged as required to, and can be located at bottom； Overfall 3 is used to export the fresh water that is formed after separation, and water inlet 5 is communicated with water inlet pipe 4, for by pending buck be delivered into The mouth of a river 5, and pending buck can be caused to introduce water inlet 5 in freely overboard form, buffered water is flowed into by water inlet 5 In case 2；Water inlet 5 can make it that water inlet direction is consistent with the direction of the Coriolis inertia force of pending buck.

Wherein, the barrel dliameter of buffer tank 2 refers to more than predetermined value, the buffer tank 2 have for cyclone compared with Big barrel dliameter, to cause pending buck to be at owing dynamic regime, therefore, the predetermined value root after via water inlet 5 entering Carry out integrating setting according to the position etc. that opens up of the flow velocity for the buck for entering water inlet 5, the height of buffer tank 2, water inlet 5, with Auxiliary, which is realized, owes power water inlet.

As shown in figure 1, water inlet 5 can be opened in the tangential of buffer tank 2, and water inlet direction is guided to tilt down, with Enable water inlet direction and the direction of the Coriolis inertia force of pending buck substantially uniform, so as to heavier suspension energy Enough directions along arrow shown in Fig. 1, which are circled round, to be settled, and realizes obvious deep or light layering.Specifically, water inlet direction can dip down Oblique 3 degree, now corresponding gradient is about 1:20.

As shown in Fig. 2 because China is located in the Northern Hemisphere, water inlet direction can in the counterclockwise direction, heavier suspension edge Arrow shown in Fig. 2 is surround counterclockwise from outside to inside, is finally collected in the center of the bottom of buffer tank 2.

In the prior art, because centrifugal motion is processed the constraint of equipment inner wall, when intake pressure is enough, in water tank Media flow can finally reach that stable state, i.e. invariablenes turning speed, the distribution of radial direction material are constant.From Newton's second law, Centripetal acceleration is equal to the difference of radial pressure suffered by unit volume.This gas with earth surface is close by as terrestrial gravitation Inside and outside lamination caused by degree big material meeting outward movment, i.e. centrifugal motion.Cyclone is exactly to utilize this centrifugal principle It is made.

But, when feed is short of power, the rotational flow of the water in water tank will gradually stop, because tank inner wall rubs The effect of power is wiped, the water at edge will slow down at first to stop, and so, current diametrically there is current gradient；Exerted according to uncle Sharp flow equation can be obtained, and the pressure of radial direction causes heavier suspension to central motion, with the flow direction phase under lower state Instead.The utility model is made using this separation principle.

Difference based on principle, in the prior art, cyclone require that interior media has higher stabilized (steady-state) speed, make weight Grain overcomes the resistance of water to be moved to wall, and under the collective effect of self gravitation, is moved along wall downward spiral, thin and small Particle and most of water and close to wall do not do gyration with slurry, reach separating effect then because suffered centrifugal force is small.

The separation principle of cyclone requires that it possesses following factor：

(1) extra addition feed pump is needed to meet the operation power demand of its stabilized (steady-state) speed；

(2) barrel dliameter is unsuitable excessive, and too big barrel dliameter will obtain constant rotational speed huge energy consumption, but small barrel dliameter determines that it is smaller Treating capacity；

(3) to reduce friction energy loss, inwall requires smooth；

(4) it is the monolithic stability eddy flow of acquisition interior media, it is necessary in upper tangential water inlet；

(5) to obtain preferable separating effect, the cone angle of its bottom wall is generally less than 20 °, if particle separation diameter is small or even low In 5 °, processing difficulties.

Relatively, the utility model requires that interior media is run in the case where owing power, interior media is in current all the time and turns The unstable state that speed gradually weakens, it is poly- to centre bottom so that weight particle is to central motion, and in the presence of self gravitation Hold together, form obvious deep or light layering, reach separating effect.

Based on above-mentioned principle, so that pending buck is from wet electrical dust precipitator as an example, in the utility model, on the one hand, It is the ash bucket of wet electrical dust precipitator is high-order freely overboard so that water inlet pipe 4 is by pending buck with the free overboard shape of gravity stream Formula introduces water inlet 5, to meet the demand that it owes power water inlet, also a saving energy consumption and cost, without extra addition feed pump； On the other hand, buffer tank 2 of the present utility model is the cylindrical shape that barrel dliameter is more than predetermined value, and its barrel dliameter is sufficiently large, due to owing dynamic Power is intake, and big barrel dliameter is easier to obtain the unstable state that current rotating speed gradually weakens, and is conducive to heavier suspension to center Motion；Furthermore, to ensure that top overflow is not influenceed by bottom eddy flow, open up water inlet 5 at middle part, and the water inlet 5 can be with So that water inlet direction and the direction of Coriolis inertia force are substantially uniform, and then using inertia force heavier suspension is being returned Natural subsidence during turning so that fresh water forms obvious deep or light layering to overflow, will not also disturb what top overflow was formed Fresh water；Meanwhile, overfall 3 is opened in top, according to above-mentioned principle, more up the content of suspension is fewer in fresh water, therefore opens Fresh water the purest can be exported by being located at the overfall 3 on top so that the fresh water of output disclosure satisfy that the demand of recycling.

It is appreciated that water inlet 5 to open up position unsuitable too high, otherwise, suspension in the lower section of water inlet 5 and just Larger resistance can be produced to the buck newly entered, be unfavorable for the sedimentation of suspension in buck in the buck of processing；Moreover, water inlet The position that opens up of mouth 5 should not be too low, is otherwise not enough to be formed the settlement space of enough height, can not provide enough processing Amount, can influence separative efficiency and separating effect.Therefore, water inlet 5 is opened in the middle part of buffer tank 2 in the utility model.

It will also be appreciated that comparatively middle part of the present utility model, upper and lower part are, middle part refers in buffering The center of the short transverse of water tank 2 central region that extension certain distance is formed downwards upwards respectively, is not defined to strictly The middle of buffer tank 2；Similarly, top refers to the region above middle part, and bottom refers to the region below middle part.

In one embodiment, water inlet 5 could be arranged to square, and opening direction is in the tangentially extending of buffer tank 2； Water inlet pipe 4 can be round tube, be coordinated with the ash bucket preferably with wet electrical dust precipitator, and can be with its tube wall and by water inlet pipe The 4 pending bucks flowed into are fully contacted, and then carry out buffer deceleration to pending buck, with cause pending buck final with Suitable initial velocity flows into buffer tank 2 via water inlet 5, is that follow-up separating treatment lays the foundation；For realize water inlet pipe 4 with The connection of water inlet 5, can be using circumference section 6, as shown in figure 1, realizing the company of water inlet 5 and water inlet pipe 4 by having an area of section 6 It is logical.

Also, the height of water inlet pipe 4 can also be controlled, water inlet pipe 4, which is provided with, to be used to introduce entering for pending buck Mouth 41, the entrance 41 is not less than overfall 3, and there is predetermined height difference with overfall 3.In the embodiment shown in fig. 1, this enters Entrance 41 is higher than overfall 3, and has predetermined height difference between overfall 3, overboard to the freedom of gravity stream using difference in height Initial velocity is controlled, it is possible to requirement according to the content of suspension in pending buck, to forming fresh water after processing etc. Predetermined height difference is controlled, preferably to match with circulation.

Meanwhile, the cross-sectional area of water inlet 5 can be roughly equal with the cross-sectional area of water inlet pipe 4, to reduce pending ash The change of flow velocity when water enters water inlet 5 by the classical prescription round knot 6 of water inlet pipe 4, is easy to control pending buck to enter buffer tank 2 Flow velocity, optimizes separating effect.

When pending buck enters water inlet 5 with suitable flow velocity, the setting of water inlet 5 causes in water inlet direction and section The direction of profit inertia force difficult to understand is consistent, so cause in the presence of the inertia force direction of arrow shown in suspension along Fig. 1 by outer and Interior convolution, and during the convolution in the presence of suspension deadweight natural subsidence, most suspension accumulates in buffer tank 2 at last The center of bottom, and acted on by bottom suspension so that fresh water forms fresh water aquifer on the top of water inlet 5 toward overflow, real Existing air-coal separating.

On the basis of the above, as shown in Fig. 2 overfall 3 could be arranged to the length of the rectangular opening of wide and flat shape, the i.e. rectangular opening Side is more than short side, and difference is larger, for example, long side can be more than twice of short side, to cause overfall 3 to be rendered obvious by as width It is flat-shaped.The short side of overfall 3 may be at above-below direction, and long side can be generally in the circumference of buffer tank 2.

As described above, the content of suspension is relevant with the height residing for it in fresh water, then overfall 3 is set into wide and flat shape Rectangular opening when, can outwards export the relatively low fresh water of the suspension content in higher position, raising exports the pure of fresh water Cleanliness, better meets the use demand of the circulatory system；Simultaneously as overfall 3 is wider, with enough cross-sectional areas, There is enough water yields in unit interval, the demand of fresh water output quantity is met.

In addition, further to strengthen friction eceleration, the inwall of buffer tank 2 can be set to coarse surface, i.e., should The coefficient of friction of inwall is more than pre-determined factor, and the relevant criterion that pre-determined factor is referred to this area is formulated.In a kind of embodiment In, the inwall of buffer tank 2 can be met into requirement using simple glass scale anticorrosion coating.

In addition, in the utility model, the bottom of buffer tank 2 can be back taper, and due to its separation principle with it is existing Cyclone in technology is different, and the bottom cone angle of the utility model buffer tank 2 does not influence separating effect, and only favourable blowdown is Can, therefore the cone angle of its bottom is more than or equal to 150 °, manufacturing process is more simple.

Correspondingly, can be by sewage draining exit 1 at the cone angle of the bottom of buffer tank 2, in favor of blowdown.

The cone angle for being additionally, since bottom is relatively large, then the size of the sewage draining exit 1 in bottom is not by the knot of buffer tank 2 The limitation of structure, can require to determine, its blowdown flow rate is easily controllable, can fully meet according to wet electrical dust precipitator Process of Water Circulating System The water balance requirement of system.

Understood with reference to Fig. 1, the utility model can also include blow-off pipe 7, the blow-off pipe 7 be connected with sewage draining exit 1, for inciting somebody to action The concentrated water formed after processing is delivered to wet desulfurization system, is used as the process water of wet desulfurization system.

The overflow pipe 8 connected with overfall 3 is also provided with, the fresh water for overflow to be formed is delivered to wet-esp The circulatory system of device, is recycled.

Compared with the scheme of prior art in background technology, the utility model has the effect that：

(1) flocculant, need not be added, original water quality, no administration apparatus, reduction equipment cost and operation consumptive material are not influenceed；

(2), only by the appropriate dilatation of original buffer tank 2, no other equipment will not take extra place；

(3) the ash bucket gravity stream, by the use of a high position is freely overboard as deficient power source, and without extra power source, reduction is set Standby cost and operation power consumption；

(4), because the size of sewage draining exit 1 of bottom is not limited by the structure of buffer tank 2, it can be followed according to wet electrical dust precipitator Ring water system technological requirement is determined, and then realizes the concentrated water drainage of very little, meets the service requirement of wet electrical dust precipitator；

(5) it is, simple in construction, it is reliable, wet electrical dust precipitator buck is realized with minimum equipment cost and maintenance cost Air-coal separating.

Scroll-tupe buck light-dark separation device is provided the utility model above to be described in detail.It is used herein Specific case is set forth to principle of the present utility model and embodiment, and the explanation of above example is only intended to help Understand core concept of the present utility model.It should be pointed out that for those skilled in the art, not departing from this On the premise of utility model principle, some improvement and modification can also be carried out to the utility model, these are improved and modification also falls Enter in the utility model scope of the claims.

Claims (10)

1. a kind of Scroll-tupe buck light-dark separation device, including the buffer tank (2) with sewage draining exit (1), it is characterised in that institute The cylindrical shape that buffer tank (2) is more than predetermined value for barrel dliameter is stated, and the side wall on its top offers the overfall (3) of fresh water, its The side wall at middle part offers the water inlet (5) connected with water inlet pipe (4), and the water inlet pipe (4) is used to convey pending buck, and The pending buck is introduced into the water inlet (5), the water inlet direction of the water inlet (5) and institute in freely overboard form The direction for stating the Coriolis inertia force of pending buck is consistent.

2. Scroll-tupe buck light-dark separation device as claimed in claim 1, it is characterised in that the water inlet (5) is opened in The buffer tank (2) it is tangential, and guide the water inlet direction to tilt down, to cause the water inlet direction to wait to locate with described The direction for managing the Coriolis inertia force of buck is consistent.

3. Scroll-tupe buck light-dark separation device as claimed in claim 2, it is characterised in that the water inlet (5) be it is square, The water inlet pipe (4) is round tube, and the water inlet pipe (4) is connected with the water inlet (5) by having an area of section (6).

4. Scroll-tupe buck light-dark separation device as claimed in claim 3, it is characterised in that the water inlet (5) it is transversal Area is equal with the cross-sectional area of the water inlet pipe (4).

5. the Scroll-tupe buck light-dark separation device as described in claim any one of 1-4, it is characterised in that the overfall (3) it is the rectangular opening of wide and flat shape.

6. Scroll-tupe buck light-dark separation device as claimed in claim 5, it is characterised in that the buffer tank (2) it is interior The coefficient of friction of wall is more than pre-determined factor.

7. Scroll-tupe buck light-dark separation device as claimed in claim 6, it is characterised in that the bottom of the buffer tank (2) Portion is back taper, and cone angle is more than or equal to 150 degree.

8. Scroll-tupe buck light-dark separation device as claimed in claim 7, it is characterised in that the sewage draining exit (1) is located at institute At the cone angle for the bottom for stating buffer tank (2).

9. Scroll-tupe buck light-dark separation device as claimed in claim 8, it is characterised in that the sewage draining exit (1) is communicated with Blow-off pipe (7), wet desulfurization system is delivered to as process water will pass through the blow-off pipe (7) by the concentrated water after processing；With/ Or, the overfall (3) is communicated with overflow pipe (8), recycled for the fresh water that overflow goes out to be delivered into wet electrical dust precipitator.

10. Scroll-tupe buck light-dark separation device as claimed in claim 5, it is characterised in that the water inlet pipe (4) is used to draw The entrance (41) for entering the pending buck is not less than tool between the overfall (3), and the entrance and the overfall (3) There is predetermined height difference.