CN102921288B - Y-shaped absorption tower and method for performing flue gas desulfurization by using Y-shaped absorption tower - Google Patents
Y-shaped absorption tower and method for performing flue gas desulfurization by using Y-shaped absorption tower Download PDFInfo
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Abstract
The invention discloses a Y-shaped absorption tower and a method for performing flue gas desulfurization by using the Y-shaped absorption tower. The Y-shaped absorption tower comprises a tower body, a flue gas outlet formed in the top of the tower body, a spraying layer positioned below the flue gas outlet, and a flue gas inlet formed in the lower part of the tower body, wherein a Y-shaped isolator covering the cross section of the tower body is arranged between the spraying layer and the flue gas inlet and comprises a plurality of tightly adjacent basic units; each basic unit comprises two strip-type perforated plates crossing the cross section of the tower body, a plurality of liquid collection buckets which are connected with the bottom edges of the two strip-type perforated plates and are tightly adjacent to one another along the length directions of the strip-type perforated plates, and liquid drop pipes communicated with the bottoms of the liquid collection buckets; the bottoms of the two strip-type perforated plates are inclined towards each other; and at least one liquid layer height controller communicated with the tower body is arranged on a position on the outer wall of the tower body and corresponds to the position of the Y-shaped isolator. Compared with the conventional absorption tower, the absorption tower has the advantages that the occupied area is small, the height is low, the desulfurization is high, and the desulfurization energy consumption is low.
Description
Technical field
The present invention relates to smoke gas treatment technical field, a kind of method that is specifically related to Y type baffle tower and carries out flue gas desulfurization with it.
Background technology
The tower that is applied at present the gas-liquid contact reaction of chemical industry, field of Environment Protection mainly contains spray column, bubble tower, sieve-plate tower etc.
Spray column is mainly spray void tower, is laid with some nozzles in tower, multilayer layout, and this tower is most widely used, and feature is technology maturation, and investment cost is low, but reaction efficiency is not high, and energy consumption is larger.
Pallet tower/percolation tower is the derivative tower of spray column, lays porous pallet in the bottom of spraying layer, increases the gas-liquid contact reaction time, and gas, liquid all flow through from perforate, and this tower technology is relatively ripe, and reaction efficiency is higher than spray void tower, and liquid-gas ratio decreases; But the resistance of pallet is larger, gas-liquid fluidised form shakiness, technology and cost advantage not obvious compared with spray void tower.
The representative of bubble tower is Japanese CT121 type bubble tower, and the Chinese invention patent that the patent No. is ZL200810226157.0 discloses a kind of for removing the bubble tower of sour gas of dusty gas, and it comprises: tower body; Be arranged on tower body top for passing into the air inlet of dusty gas; One or more layers spray mother for spraying liquid who is positioned at described air inlet below manages, and wherein on the female pipe of each spray, is provided with many nozzles; Be positioned at the dividing plate of the female pipe of described spray below; Be arranged in the playpipe that dividing plate below and one end are immersed in liquid; Through described dividing plate and its one end be positioned at dividing plate below for adding or the liquid supplementation pipe of liquid make-up; The demister that is arranged on the middle and lower part of tower body and be communicated with the sidewall of tower body and be arranged on after demister for discharging the exhaust outlet of purified gas; One end stretch in liquid for passing into the oxidation airduct of oxic gas; For the agitator of agitated liquid; Be arranged on the bottom of tower body for discharging the discharging tube of liquid in tower, optionally this discharging tube is communicated with the slurry pump of discharging for accelerating liquid.
The feature of bubble tower is that absorption reaction efficiency is high, and equipment is few, but floor space is larger, and more than SR has reached 3000Pa, operating cost is higher.
Sieve-plate tower is a kind of ripe tower, be mainly used in chemical field, the Chinese utility model patent that for example patent No. is ZL201120559568.9 discloses a kind of sieve-plate tower for flue gas of sintering machine, belong to resource and environment protection field, device comprises absorption tower, absorption tower is provided with smoke inlet, exhanst gas outlet and desulfurizing agent entrance, in absorption tower, be provided with successively from top to bottom demist layer, spraying layer, sieve plate and stock tank, desulfurizing agent entrance is positioned at smoke inlet top, sieve plate is between desulfurizing agent entrance and smoke inlet, sieve plate top is provided with downflow weir, sieve plate is divided into overflow area and bubbling area by downflow weir, the sieve aperture of sieve plate is located at bubbling area, bubbling area is positioned at the side of sieve plate near desulfurizing agent entrance, below, overflow area is provided with overflow pipe.
The feature of sieve-plate tower is that absorption efficiency is high, and technology maturation takes multilayer to arrange, resistance is larger, because sieve aperture is less, while using the larger slurries of solid content, easily stops up.
Summary of the invention
A kind of method that the invention provides Y type baffle tower and carry out flue gas desulfurization with it, solves that existing absorption tower floor space is large, energy consumption is high, susceptible to plugging problem.
A kind of Y type baffle tower, comprise tower body, be positioned at tower body top exhanst gas outlet, be positioned at the spraying layer of exhanst gas outlet below and be positioned at the smoke inlet of tower body bottom, between described spraying layer and smoke inlet, be provided with the Y type isolator of the cross section that covers described tower body, described Y type isolator comprises the base unit that several next-door neighbours arrange
Described base unit comprises: two several liquid collecting buckets that are connected across the bar shaped orifice plate of described tower body cross section and bottom opposite tilt, with two described bar shaped orifice plate bases and arrange along bar shaped orifice plate length direction next-door neighbour and the downspout being communicated with described liquid collecting bucket bottom
On described tower body outer wall and with corresponding position, Y type isolator position, be provided with the height of liquid layer controller that at least one is communicated with tower body.
In tower body of the present invention, single-layer separator is installed, isolator is made up of some bar shaped porous baffles, and bar shaped orifice plate and attached liquid collecting bucket, the seemingly Y type of its cross sectional shape of base unit of downspout composition, therefore claim Y type baffle tower.
Preferably, the bottom opening of described downspout is horn mouth.
The liquid that liquid collecting bucket is mainly collected spray liquid and flowed down from bar shaped orifice plate inclined-plane, the funnel-form that is square together with downspout, arranges along the bottom next-door neighbour of two bar shaped orifice plates, quantity defines according to bar shaped orifice plate length; Downspout afterbody is diffusion bell mouth shape.Liquid collecting bucket, the downspout arranged along two block length bar orifice plate bottoms form a base unit together with two orifice plates.Different according to absorption tower area and shape, Y type isolator is made up of several base units, only need lay a small amount of unidirectional crossbeam in tower while laying, convenient, cost savings is installed, and has reduced stopping air-flow.
The downspout gravity flow of Y type isolator dense distribution forms scrubber layer, liquid forms certain scattering angle to cover the whole cross section of tower body, absorption tower by the diffusion horn mouth of downspout afterbody, the sulfur-containing smoke gas entering with smoke inlet carries out preliminary haptoreaction, and its desulfuration efficiency is 25～32%; Flue gas is lowered the temperature, make steam-laden in flue gas, prevent from forming in Y type isolator bottom surface dry wet interface and cause fouling.The liquid of Y type isolator liquid layer bottom continues to drain into below by liquid collecting bucket and downspout, has strengthened the upper and lower transition from the old to the new of liquid layer, ensures the reactivity of liquid layer.
Preferably, the angle of described bar shaped orifice plate and horizontal plane is 45～60 °.
More preferably 60 ° of the angles of described bar shaped orifice plate and horizontal plane.Bar shaped orifice plate is horizontal, and minor face tilts and is 60 ° with horizontal plane angle, and every two bar shaped orifice plates are according to V-type layout and be mutually 60 ° of angles.
Preferably, the width of described bar shaped orifice plate is 80～150mm, more preferably 100mm.
Preferably, the perforate aperture of described bar shaped orifice plate is 10～15mm, and percent opening is 10～20%; More preferably 12mm of perforate aperture, percent opening more preferably 17.6%, perforate is circular, circular hole adopts equilateral triangle mode to arrange, be that spacing between adjacent three holes is identical, pitch of holes is preferably set to 25mm, and t ≈ 2.1 (t=pitch of holes/aperture), can be set between 1.2～3 according to actual conditions t.
Preferably, the base spacing of two described bar shaped orifice plates is 15～50mm, more preferably 25mm.
The bar shaped orifice plate of Y type isolator adopts inclination mode to arrange, orifice plate area summation is equivalent to 1.6 times that absorbing tower body section amasss, and when monolithic bar shaped orifice plate percent opening reaches 17.6%, the flue gas flow-passing surface of Y type isolator reaches 28%; The bar shaped orifice plate being in tilted layout carries out water conservancy diversion to flue gas, and the drag losses under dry state is below 400Pa; Bar shaped orifice plate is only 65mm apart from depth displacement between maximum hole between the upper and lower, and the drag effects that liquid layer pressure differential is caused air-flow is down to zone of reasonableness, has guaranteed that air-flow is evenly distributed.
The gas-liquid contact of tradition tower is mostly forward counter current contacting, mutually impacts strongly, and be the major incentive of fluidised form unstability, skewness after Gas-Liquid Contacting.The present invention adopts the bar shaped orifice plate being in tilted layout, and liquid flows to liquid collecting bucket along bar shaped orifice plate inclined-plane, and flue gas enters along perforate is oblique, 120 ° of gas-liquid contact angle <, and the froth bed of formation is more stable; The bar shaped orifice plate being in tilted layout produces guide functions to air-flow, and air-flow is through curved rising situation after circular hole, in liquid layer the time of staying longer, react more abundant, the sulfur dioxide removal rate after Y type isolator haptoreaction in flue gas has reached 92～98%.
Preferably, the distance between described spraying layer and Y type isolator is 1～3m, and magnitude setting is single or multiple lift.The fluid flow that spraying layer sprays into designs according to actual conditions.
Preferably, described height of liquid layer controller comprises: the horizontal isocon that is communicated with the tower body at Y type isolator end face place, be arranged on horizontal isocon bottom for the control plate of level of control isocon inner chamber aperture and the overflow pipe of the horizontal isocon afterbody of connection and tower body bottom.
More preferably, the top of described horizontal isocon is provided with control handwheel, and described control handwheel is connected with described control plate by screw rod.Convenient to controlling the adjusting of plate.
Described height of liquid layer controller is used for controlling the height of liquid layer on Y type isolator top, the partially liq spraying flows down by the downspout of Y type isolator, other liquid need continue by height of liquid layer controller, stable overflow enters absorption tower tower reactor, and height of liquid layer remains unchanged; Regulate by the height of controlling plate in height of liquid layer controller, the overflow position height of adjustable liquid layer, thus reach the object of adjusting height of liquid layer.
Liquid via controller carries out continual and steady overflow and remains unchanged to ensure height of liquid layer, and when exhaust gas volumn reduces, adjustment control plate to reduce height of liquid layer, ensures that the phenomenon of leakage does not occur orifice plate to low level, reduces system operation energy consumption; When exhaust gas volumn improves, heighten height of liquid layer and prevent the generation of liquid flooding and crossfire phenomenon, improve desulfuration efficiency, guaranteed larger operating flexibility.
Overflow pipe passes into tower reactor middle and lower part, and the pressure that relies on the liquid level of tower reactor self to form prevents that gas from passing through.Can be multiple along isolator periphery according to the big or small height of liquid layer controller of Y type isolator area, even to ensure height of liquid layer.Preferred as one, height of liquid layer controller and exhaust gas volumn link to realize automation control.
Described cross section, absorption tower can be square or circular, preferred as one, absorption tower sectional area≤20m
2time, adopt absorption tower, square-section, be conducive to arrange Y type isolator, increasing section utilization rate; Absorption tower sectional area > 20m
2time, adopt circular cross-section absorption tower, to ensure structural strength.Absorption tower sectional area is that 4～6m/s designs by empty tower gas velocity.
The present invention also provides a kind of method of utilizing described Y type baffle tower to carry out flue gas desulfurization, comprising:
The slurries that sprayed by spraying layer are enriched in bar shaped orifice plate, a part flows out from downspout, exit at downspout forms scrubber layer, with the flue gas haptoreaction being passed into by smoke inlet, a part is deposited on and on bar shaped orifice plate, forms liquid layer and carry out absorption reaction with the flue gas through bar shaped orifice plate, and the height of liquid layer is regulated by height of liquid layer controller;
Described flue gas is passed in tower body by smoke inlet, the slurries that flow down with the downspout of Y type isolator carry out initial reaction, then enter in the liquid layer of bar shaped orifice plate and carry out absorption reaction with liquid layer through the bar shaped orifice plate of Y type isolator, finally enter spraying layer below through liquid layer, absorption reaction is carried out in the slurries absorption continuing under spraying with spraying layer, discharges finally by exhanst gas outlet.
Beneficial effect of the present invention:
The absorption tower towers such as traditional spray void tower, sieve-plate tower, pallet tower (percolation tower), CT121, respectively have weak point and application limitation.Traditional spray void tower liquid-gas ratio is large, and absorption tower height is high, and tower diameter is large; Sieve-plate tower is easy blockage phenomenon in the time using the higher slurries of solid content, and operating flexibility is low, and tolerance variation can cause liquid flooding or the phenomenon of leakage to occur; , easily there is gas, the reciprocal wave phenomenon of liquid in pallet tower (percolation tower) pallet overdraught skewness in the time that sectional area is larger; CT121 floor space is large, and resistance is high, and design difficulty is high.
More conventional absorption tower, absorption tower of the present invention floor space reduces nearly 30%, in the situation of same treatment ability, tower height reduces by 3～5m, liquid-gas ratio is equivalent to 25～33% of traditional spray washing technology, full tower draught control is below 1600Pa, the perforate of Y type isolator is larger, can adapt to the slurries of solid content below 25%, operation steady in a long-term and blockage phenomenon not.Absorption tower of the present invention is not only applicable to new construction, is applicable to the reconstruction project of operation surplus simultaneously, reduces project investment and operation cost.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is top view of the present invention.
Fig. 3 is that invention Y type isolator is along the A shown in Fig. 1 to view.
Fig. 4 is the structural representation of bar shaped orifice plate of the present invention.
Fig. 5 is the fluidised form distribution schematic diagram on absorption tower of the present invention.
Shown in figure, Reference numeral is as follows:
1, base unit, 2, bar shaped orifice plate, 3, liquid collecting bucket, 4, downspout, 5, horizontal isocon, 6, control plate, 7, control handwheel, 8, overflow pipe, 9, mounting interface base, 10, smoke inlet, 11, entrance space, 12, spray space, 13, spraying layer, 14, shower nozzle, 15, outlet space, 16, gravity flow scrubber layer, 17, liquid layer, 18, tower body.
Detailed description of the invention
As shown in Figure 1, a kind of Y type baffle tower, comprise tower body 18, in present embodiment, the cross section of tower body 18 is square, tower body 18 is interior arranges spraying layer 13 near top place, and some shower nozzles 14 that spraying layer 13 is managed and is arranged on by mother on female pipe form, and spraying layer 13 can be set to single or multiple lift as required; Spraying layer 13 tops form outlet spaces 15, and outlet 15 tops, space are exhanst gas outlet (in figure for illustrating); Below spraying layer 13,2m place arranges Y type isolator, and the space between Y type isolator and spraying layer 13 is spray space 12; On tower wall below Y type isolator, smoke inlet 10 is set, the space between smoke inlet 10 and Y type isolator is entrance space 11; Be the tower reactor of tower body 18 in the bottom of entrance space 11; At tower body 18 outer walls and corresponding position, Y type isolator position, height of liquid layer controller is set, in present embodiment, height of liquid layer controller is set to 1.
As shown in Figures 1 to 3, Y type isolator covers the whole cross section of tower body 18, arranged and formed by several base units 1 (the dotted line frame part in Fig. 2) next-door neighbour, each base unit 1 comprises bar shaped orifice plate 2, the liquid collecting bucket 3 being connected with the base of two bar shaped orifice plates 2 of two bottom opposite tilts and the downspout 4 being communicated with liquid collecting bucket 3 bottoms.
Bar shaped orifice plate 2 is the critical piece of base unit 1, structure as shown in Figure 4, in present embodiment, is the width steel plate that is 100mm, length defines according to actual conditions, adapt to the width of tower body 18, ensure the cross section of horizontal fast whole tower body 18, on plate, have the circular hole that 4 round footpaths are 12mm, pitch of holes is 25mm, two row's circular holes are staggeredly arranged, and adjacent three circular hole spacing are all 25mm, and percent opening is 17.6%.
As shown in Figure 3, in each base unit 1, two bar shaped orifice plates 2 are horizontal, minor face tilts and also and between horizontal plane is 60 ° of angles, V-shaped layout, between two boards, be 60 ° of angles, the spacing between two bar shaped orifice plate 2 bases is 25mm, along the length direction of bar shaped orifice plate 2, next-door neighbour arranges several liquid collecting buckets 3, the top edge of liquid collecting bucket 3 is closely connected with the base of two boards, is communicated with a downspout 4 in the bottom of each liquid collecting bucket 3, and slurry pipe 4 extends to tower reactor direction, afterbody is diffusion horn mouth, and liquid collecting bucket 3 forms square-shaped hopper shape together with downspout 4.
As shown in Figure 1 and Figure 2, on tower body 18 outer walls and with corresponding position, Y type isolator position, a height of liquid layer controller is set, an opening is set on the tower wall above Y type isolator, the base of this opening flushes with the end face of Y type isolator, tower body 18 outer walls arrange one with the horizontal isocon 5 of this open communication, the mounting interface base 9 of horizontal isocon 5 flushes with the base of bar shaped orifice plate 2, and the afterbody of horizontal isocon 5 is communicated with the middle and lower part of tower reactor by an overflow pipe 8.
Arrange one in the bottom of horizontal isocon 5 and control plate 6, control plate 6 along vertically inserting in horizontal isocon 5 to passing tube wall, the upper edge of controlling plate 6 is arranged in the inner chamber of horizontal isocon 5, a control handwheel 7 is set on tube wall above horizontal isocon 5, controlling handwheel 7 is connected with the upper edge of controlling plate 6 by a screw rod stretching in inner chamber, the height of the upper edge of rotation control handwheel 7 adjusting control plates 6 in inner chamber, regulate the aperture of inner chamber, reach and control in Y type isolator the height of liquid layer on liquid layer.
As shown in Figure 5, for the fluidised form schematic diagram in invention absorption tower, flue gas is in smoke inlet 11 enters tower body 18, motion from bottom to top, liquid is in spraying layer 13 sprays into tower body 18, fall on Y type isolator from top to bottom and form the liquid layer 17 of certain altitude, partially liq is the lower gravity flow scrubber layer 16 that forms of umbrella row by downspout 4 afterbodys after liquid collecting bucket 3 is collected, gravity flow scrubber layer 16 is lowered the temperature to the flue gas in entrance space 11 and once contacts, flue gas is through once rising to each bar shaped orifice plate 2 belows after contact, because bar shaped orifice plate 2 area of passages are much smaller than tower body 18 sectional areas, flue gas flow rate increases and high speed is passed the circular hole on bar shaped orifice plate 2, hold liquid layer 17 and prevent that liquid from falling from circular hole, flue gas and liquid layer 17 carry out entering spray space 12 after secondary haptoreaction, and rise to outlet space 15 after carrying out three haptoreactions in spray space 12 with spray liquid, finally discharged by exhanst gas outlet.
In running, according to actual condition demand, the height of liquid layer 17 is regulated, controlled by height of liquid layer controller, rotation is controlled handwheel 7 and is regulated the height of controlling plate 6, liquid need stride across the upper edge of control plate 6 and carry out overflow, control plate 6 highly higher, liquid layer 17 is highly higher, otherwise both reduces, and overflow liquid enters the tower reactor bottom of the rear importing tower body 18 of overflow pipe 8.Application examples
Certain the 1 × 130t/h of power plant coal burning flue gas desulfurization system, mark condition exhaust gas volumn is 170,000 Nm
3/ h, 130 DEG C of entrance flue gas temperatures, entrance sulfur dioxide concentration 4000～5000mg/Nm
3, adopting absorption tower of the present invention, tower section is square, area 11m
2, tower height 16m, adopts individual layer spray, and spray flux is 680m
3/ h, under full load condition, full tower resistance 1500Pa, moves nearly 1 year, and mean efficiency of desulfurization is to be 6000h 98.5 time between overhauls(TBO)s, the more conventional spray void tower of operating cost Techniques For Reducing 9～16%.
Claims (10)
1. a Y type baffle tower, comprise tower body, be positioned at tower body top exhanst gas outlet, be positioned at the spraying layer of exhanst gas outlet below and be positioned at the smoke inlet of tower body bottom, it is characterized in that,
Between described spraying layer and smoke inlet, be provided with the Y type isolator of the cross section that covers described tower body,
Described Y type isolator comprises the base unit that several next-door neighbours arrange,
Described base unit comprises: two several liquid collecting buckets that are connected across the bar shaped orifice plate of described tower body cross section and bottom opposite tilt, with two described bar shaped orifice plate bases and arrange along bar shaped orifice plate length direction next-door neighbour and the downspout being communicated with described liquid collecting bucket bottom
On described tower body outer wall and with corresponding position, Y type isolator position, be provided with the height of liquid layer controller that at least one is communicated with tower body.
2. Y type baffle tower according to claim 1, is characterized in that, the bottom opening of described downspout is horn mouth.
3. Y type baffle tower according to claim 1, is characterized in that, the angle of described bar shaped orifice plate and horizontal plane is 45～60 °.
4. Y type baffle tower according to claim 3, is characterized in that, the width of described bar shaped orifice plate is 80～150mm.
5. Y type baffle tower according to claim 4, is characterized in that, the perforate aperture of described bar shaped orifice plate is 10～15mm, and percent opening is 10～20%.
6. Y type baffle tower according to claim 5, is characterized in that, the base spacing of two described bar shaped orifice plates is 15～50mm.
7. Y type baffle tower according to claim 1, is characterized in that, the distance between described spraying layer and Y type isolator is 1～3m, and magnitude setting is single or multiple lift.
8. according to the Y type baffle tower described in the arbitrary claim of claim 1～7, it is characterized in that, described height of liquid layer controller comprises:
The horizontal isocon that is communicated with the tower body at Y type isolator end face place, be arranged on horizontal isocon bottom for the control plate of level of control isocon inner chamber aperture and the overflow pipe of the horizontal isocon afterbody of connection and tower body bottom.
9. Y type baffle tower according to claim 8, is characterized in that, the top of described horizontal isocon is provided with control handwheel, and described control handwheel is connected with described control plate by screw rod.
10. a method of utilizing the Y type baffle tower described in claim 1 to carry out flue gas desulfurization, is characterized in that, comprising:
The slurries that sprayed by spraying layer are enriched in bar shaped orifice plate, a part flows out from downspout, exit at downspout forms scrubber layer, with the flue gas haptoreaction being passed into by smoke inlet, a part is deposited on and on bar shaped orifice plate, forms liquid layer and carry out absorption reaction with the flue gas through bar shaped orifice plate, and the height of liquid layer is regulated by height of liquid layer controller;
Described flue gas is passed in tower body by smoke inlet, the slurries that flow down with the downspout of Y type isolator carry out initial reaction, then enter in the liquid layer of bar shaped orifice plate and carry out absorption reaction with liquid layer through the bar shaped orifice plate of Y type isolator, finally enter spraying layer below through liquid layer, absorption reaction is carried out in the slurries absorption continuing under spraying with spraying layer, discharges finally by exhanst gas outlet.
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| CN108970383A (en) * | 2018-09-19 | 2018-12-11 | 合肥水泥研究设计院有限公司 | A kind of fume desulfurating absorption tower with twin-stage airflow distribution device |
| FR3093652B1 (en) * | 2019-03-13 | 2022-09-16 | Lab Sa | Installation for the wet purification of exhaust fumes from an engine of a marine vessel |
| CN111229036A (en) * | 2020-01-20 | 2020-06-05 | 宁波大学 | A kind of ship exhaust gas desulfurization device |
| CN112221286A (en) * | 2020-09-08 | 2021-01-15 | 中石化宁波工程有限公司 | Deep absorption tower for flue gas treatment, flue gas treatment system and process |
| CN112414195B (en) * | 2020-10-27 | 2022-05-31 | 攀枝花市蓝鼎环保科技有限公司 | Energy-saving industrial flue gas treatment device |
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