CN2272107Y

CN2272107Y - Centrifugal water film bubble dust remover

Info

Publication number: CN2272107Y
Application number: CN 96209522
Authority: CN
Inventors: 许绍仙
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-05-15
Filing date: 1996-05-15
Publication date: 1998-01-07
Anticipated expiration: 2006-05-15

Abstract

The utility model relates to a smoke prevention dust control and desulfurizing apparatus with high efficiency, which is composed of a tower body, an inverted cone centrifugal water film section, two to four layers of sieve plates, a water supply system, a dehydrator, etc. Because of the corrosion, abrasion and blockage of the sieve plates and unreasonable structure design and arrangement of the sieve plates, the existing bubble dust removing method is not commendably popularized and applied. Aiming at the problems, the utility model is additionally provided with the inverted cone centrifugal water film section between a flue inlet and a lower sieve plate, and corresponding technical measures are taken to the arrangement of the aperture size of each layer of sieve plates. Through detection, the emission standard which is required by GB13271-91 can be reached after the primary treatment of the apparatus under the condition that the initial concentration of the flue is less than 35 g/Nm<3>.

Description

Centrifugal moisture film bubble dust collector

The utility model relates to the dust-remover device in a kind of environmental protection smoke gas treatment, is specially adapted to the improvement of Circulation fluidized-bed furnace, fluidized bed furnace, coal-powder boiler flue gas.

At present in the improvement side of industrial waste gas especially boiler flue and, wet scrubber commonly used has impact water bath, centrifugal moisture film, the centrifugal moisture film of venturi, inclined rodbank, turbulent flow tower, rotating stream tray scrubber deduster etc.These wet scrubbers because simple in structure, maintenance cost is low, long service life and have advantage such as desulfurization concurrently, and be widely used, but along with the raising day by day of environmental requirement, the ash-laden gas of handling high concentration with the single-stage wet scrubber of single principle does not often reach the environmental requirement in one, two class areas.

The sieve plate bubble dust collector of for example having reported and being applied to produce, its principle is: dusty gas is with the sieve aperture of certain speed by sieve plate, with the liquid foamization that sprays on the sieve plate, gas-liquid fully contacts, dust in flue gas comprises that thinner dust is hunted down, because of its mass transport process obtains highly enriched, so the foam method dedusting can obtain higher efficiency of dust collection, but because this deduster lower floor sieve plate directly is subjected to the impact of bulky grain high concentrate dust in the flue gas, sieve plate is subjected to strong wear, thereby shortened the service life of sieve plate, increased maintenance cost and changed number of times, and the dust of high concentration has often made the sieve pore blockade of lower floor's sieve plate.In addition in the past the report the sieve plate bubble dust collector, the screen-aperture of emphasizing upper sieve plate should be greater than the screen-aperture of following sieve plate, and flue gas is every through one deck sieve plate, exhaust gas volumn diminishes because of the decline of cigarette temperature, if the upper sieve plate sieve aperture is also the same with following sieve plate sieve aperture big even bigger like this, then the foam layer height on the upper sieve plate will reduce, the foaming degree of froth bed also will variation, thereby influenced efficiency of dust collection, played the sieve plate sieve aperture more little in addition, then easy more obstruction.

The purpose of this utility model, aim to provide a kind of efficiency of dust collection height, long service life, simple in structure, cost is low, safe and reliable to operation, the dust arrester that is referred to as centrifugal moisture film bubble dust collector that is easy to apply, to realize just making the dust-laden flue gas of high concentration reach the purification requirement, overcome weak point of the prior art with primary dust removing.

This centrifugal moisture film bubble dust collector has gas approach, ash hole water seal skewed slot, dedusting tower body and arrangement percolation sieve plate, water spray system, dehydrator wherein thereof.Be characterized in the dedusting tower body, centrifugal water film dedusting section directly being connected with sieve plate foam dust-removing section, centrifugal water film dedusting section is between tangential inlet flue and the following sieve plate, be the reverse taper shape, reversed cone angle is between 3 °～10 °, ratio of height to diameter is 1.2-2.5, sieve plate foam dust-removing section is made up of 2-4 layers of percolation sieve plate, the aperture of following sieve plate is greater than the aperture of upper sieve plate, sieve plate bubble dust collector epimere is provided with water spray system, dehydrator successively, the above tower sections of dehydrator is that section is done in centrifugal foam removal, and its ratio of height to diameter is 2.0-3.5.

The utility model is in common sieve plate bubble dust collector, has increased the centrifugal water film dedusting section of a reverse taper between gas approach and sieve plate, has concentrated the advantage separately of centrifugal water film dedusting and sieve plate foam dust-removing.Tube tower body in garden is made with granite or iron and steel liner glass cermaic plate in the device.Press the flue gas flow path direction, below the aperture of sieve plate sieve aperture greater than the aperture of top sieve plate, help like this improving efficiency of dust collection and service life.

Below in conjunction with drawings and Examples the utility model is described in detail.

Fig. 1 is the utility model example structure cutaway view.

Fig. 2 is Figure 1A-A cutaway view;

Wherein: 1, ash hole water seal skewed slot; 2, dedusting tower body; 3, gas approach; 4, centrifugal water film dedusting section; 5, percolation sieve plate; 6, spray section; 7, water spray system; 8, dehydrator; 9, section is done in centrifugal foam removal; 10, exhanst gas outlet.

As shown in the figure, tower body 2 material granite in the present embodiment, inner structural members such as water spray system 7, dehydrator 8 all adopt reinforced plastics in sieve plate 5 and supporting member thereof, the tower, to prevent the corrosion of sour gas in the flue gas effectively.Adopt eddy flow plate dehydrator in dehydrator 8 present embodiments, the depth-width ratio of gas approach 3 is preferably 1.5-2.0, and angle of declination is desirably 8-12 ° most, pours in down a chimney to prevent stifled ash of floss hole and sieve plate leakage fluid; The reversed cone angle of the centrifugal water film dedusting section 4 of reverse taper is 4 °-8 °, and its height is 1.5-2 times of following tower sections internal diameter; The aperture of upper, middle and lower sieve plate 5 is respectively successively and increases progressively, the arrangement that assumes diamond in shape of its hole shape, and stagger mutually in upper and lower sieve plate 5 its hole sites apart, and the spacing of sieve plate 5 generally equates; Be spray section 6 between water spray system 7 and the upper sieve plate 5, it is 2.3-3.0 that section 9 comparatively ideal ratio of height to diameters are done in centrifugal foam removal.

Purification process of the present utility model is: ash-laden gas tangentially enters in the dedusting tower body 2 from the angle of declination of gas approach 3 with 8 °-12 °, and the spiral rotation is risen, under inertia, action of centrifugal force, carried out rough dusting in the centrifugal water film dedusting section 4 of reverse taper, most of meal dirt be captured down (moisture film of centrifugal water film dedusting section 4 by down the leakage fluid of sieve plate 5 supply with).Simultaneously, the dust of no show tower wall, because effect falls in the pouring of sieve plate 5 leakage fluids, being fallen liquid than meal dirt by pouring captures, thinner dust is by moistening (for next step sieve plate foam dust-removing provides advantageous conditions), dusty gas behind centrifugal water film dedusting section 4 primary purifyings, again with the sieve aperture of certain speed by percolation sieve plate 5, with the liquid foamization that sprays on the sieve plate 5, gas-liquid fully contacts, the granule dust catching of collection at large in the centrifugal moisture film dust removal process in water, is so passed through the foam dust-removing of multilayer sieve plate, and the size particles in the flue gas is almost captured by foam.Flue gas after being purified is done section 9 through eddy flow plate dehydrator 8 dehydration and centrifugal foam removal and is dewatered, by air-introduced machine through chimney and emptying.Through moisture film and the dedusting of foam two-stage and the dust that traps in the water drains into sedimentation basin with the form of buck through ash hole water seal skewed slot 1.

The utlity model has following advantage:

1, efficiency of dust collection height is processed the high concentration flue dust, and efficient can reach more than 98.5%, and resistance moderate be 950-1300Pa, the recirculated water consumption is gas liquid ratio 0.3-0.51/Nm³。

2, floor space is little, simple in structure, can be for the treatment of the big occasion of flue gas flow. For example, adapted is on the 75t/h Circulation fluidized-bed furnace, and exhaust gas volumn is 150000m³/ h, with the centrifugal water film bubble dust remover parallel connection of two Φ, 2500/ Φ 2900, recording the import dust concentration is 26.8g/Nm³, the outlet dust concentration is 295mg/Nm³, the recirculated water consumption is 38t/h, outlet Excess air coefficient is 1.45, and resistance is 1240Pa, and efficiency of dust collection reaches 98.9%.

3, not burn into not easy to wear, can not stop up, cost is low, easy to maintenance, the operation Reliably.

4, can eliminate black smoke well, and acidic gas in flue gas is had certain catharsis.

Claims

1, a kind of centrifugal moisture film bubble dust collector, has gas approach, ash hole water seal skewed slot, dedusting tower body and arrangement percolation sieve plate wherein thereof, water spray system, dehydrator, it is characterized in that: in dedusting tower body (2), centrifugal water film dedusting section (4) is directly connected with sieve plate foam dust-removing section, centrifugal water film dedusting section (4) is between tangential inlet flue (3) and the following sieve plate (5), be the reverse taper shape, reversed cone angle is between 3 °～10 °, ratio of height to diameter is 1.2～2.5, sieve plate foam dust-removing section is made up of 2-4 layers of percolation sieve plate (5), the aperture of following sieve plate (5) is greater than the aperture of upper sieve plate (5), sieve plate foam dust-removing epimere is provided with water spray system (7) successively, dehydrator (8), the above tower sections of dehydrator (B) is that section (9) is done in centrifugal foam removal, and its ratio of height to diameter is 2.0～3.5.

2, according to the described centrifugal moisture film bubble dust collector of claim 1, it is characterized in that the inlet angle of declination of gas approach (3) is not less than 8 °, its depth-width ratio is not less than 1.5.

3, according to claim 1 or 2 described centrifugal moisture film bubble dust collectors, it is characterized in that the arrangement that assumes diamond in shape of its hole shape of sieve plate (5), stagger mutually in upper and lower its hole site of sieve plate (5) apart.