CN102764580B - A kind of apparatus and method of white clay/carbide slag-gypsum wet flue gas desulfurizing - Google Patents
A kind of apparatus and method of white clay/carbide slag-gypsum wet flue gas desulfurizing Download PDFInfo
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- CN102764580B CN102764580B CN201210248709.4A CN201210248709A CN102764580B CN 102764580 B CN102764580 B CN 102764580B CN 201210248709 A CN201210248709 A CN 201210248709A CN 102764580 B CN102764580 B CN 102764580B
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Abstract
The invention discloses a kind of apparatus and method of white clay/carbide slag-gypsum wet flue gas desulfurizing, device comprises absorption tower, the top on described absorption tower and middle part are respectively equipped with exhanst gas outlet and the first smoke inlet, demister is followed successively by from top to bottom in described absorption tower, spray equipment, spray chamber and tower reactor, described tower reactor is by be arranged in tower reactor and to be separated into slurries room and bubbling room perpendicular to the sidewall at the bottom of tower, described bubbling outdoor connects gypsum pump, its inside is provided with agitator, oxidation air and some bubbling pipes, the tower wall on described absorption tower is provided with the second smoke inlet be communicated with described bubbling pipe, described sidewall is provided with the overfall be communicated with described slurries room.Apparatus and method of the present invention are for white clay/Properties of Carbide Slag design absorption tower, spray desulfurization is carried out in spray chamber, the bubbling oxidation of desulfurization slurry is carried out in bubbling indoor, spray desulfurization and bubbling oxidation all separately to be carried out in absorption tower, ensure desulfuration efficiency and gypsum qualitt, simplified apparatus, reduces costs.
Description
Technical field
The present invention relates to flue gas desulfurization technique field, be specifically related to a kind of apparatus and method of white clay/carbide slag-gypsum wet flue gas desulfurizing.
Background technology
At present, the device principal mode that wet method removes sulfur dioxide in flue gas has: hollow-spraying-tower, column plate, packed tower, bubble tower etc., and hollow-spraying-tower tower structure is simple, not easily produce fouling, but this device desulfuration efficiency is lower; Bubble tower desulfuration efficiency is higher, but if adopt water spray to flue gas cool-down, systematic water balance will be caused unbalance, if adopt slurries spray to flue gas cool-down, will cause more serious fouling and clogging phenomenon.At present, the device of various ways combined desulfurization and the existing a large amount of report of technique is adopted.
Application number be 991139414.3 Chinese invention patent application disclose a kind of lime/gypsum method flue gas desulfurization technique and device, flue gas after dedusting makes secondary desulfuration through spray liquid again through porous plate bubble tower flue gas after desulfurization in tower, the flue gas after purification after tower top gas-liquid separator separates again through flue gas heater heating exhaust.Application number be 201120100177.0 Chinese utility model patent application discloses that a kind of downstream jet bubbling wet-method desulfurizing device, flue gas enters from tower top, descending, after spray equipment, bubbling device desulfurization from middle part discharge, only have a tower reactor in desulfurizing tower.Application number be 200810226157.0 Chinese invention patent application disclose a kind of bubble tower as desulfurizer and uses thereof, this invention is also adopt flue gas to enter from top, descending, after spray equipment, bubbling device desulfurization from middle part discharge technique, unlike the use of absorbent be red mud.The desulfurizer that above-mentioned patent relates to all tower reactor only has a subregion, and flue gas is discharged after twice desulfurization.Although desulfuration efficiency is high, output gypsum qualitt is low, impact recycling.
Application number be 200720311773.7 Chinese utility model patent application discloses that a kind of flue gas desulfurization and oxidation unit, inner desulfurization chamber and the oxidizing chamber being divided into upper gas connection by vertical clapboard of tower body, smoke inlet is located at the desulfurization chamber side of tower body, and exhanst gas outlet is located at the oxidizing chamber side of tower body, this device is spray/Bubbling method integrated apparatus.Desulfurization chamber removes most SO in flue gas
2, oxidizing chamber does not remove SO by flue gas
2and NO, Hg oxidation removal.The device that this patent relates to has two tower reactors, and tower reactor is not communicated with, and the oxidative absorption liquid Main Function spurting into oxidizing chamber removes reducing substances in flue gas.
White clay is the discarded object produced in alkali recovery process, and main component is CaCO
3can be used as the desulfurizing agent of flue gas desulfurization, but soda pulping process gained black liquor is the primary pollution source of pulping and paper-making industry, the COD produced is about more than 90% of full pulping process, and paper white sludge take black liquor of pulp making as the sediment that raw material generates, also just cause COD content in white clay very high; Carbide slag is the discarded object that carbide produces PVC, and main component is Ca (OH)
2but, containing reducing substanceses such as a large amount of sulphur anion, zeroth order sulphur, phenol, phosphorus in carbide slag.Make desulfurizing agent with white clay/carbide slag, the reducing substances in white clay/carbide slag enters slurries, produces inhibitory action, affect final output gypsum qualitt to calcium sulfite oxidation.Said method is not all suitable for the flue gas desulfurization technique that white clay/carbide slag makes desulfurizing agent.
Application number be 200810062830.1 Chinese invention patent application disclose a kind of method and apparatus of removing sulfur dioxide in flue gas with white slime, adopt white clay slurries to make desulfurizing agent, two-part Absorption Desulfurization carried out to the sulfur dioxide in flue gas.In desulfurizing tower bottom, first stage desulfurization is carried out to flue gas, the doctor solution counter current contacting of flue gas and spray; On desulfurizing tower top, second stage desulfurization is carried out to flue gas, flue gas and doctor solution counter current contacting on spiral board, demist afterwards, discharge.High-order recycle slurry liquid chamber is provided with outside desulfurizing tower, doctor solution after the second stage of collecting absorbs is carried to low level circulation overflow, the doctor solution pH value 5.5-7.0 of high-order recycling storage, be mainly used in flue gas desulfurization, the doctor solution pH value 3.0-5.5 of low level recycling storage, is mainly used in the oxidation of desulfurization slurry.In this device, the serum pot of high-order circulation is positioned at outside absorption tower.
Application number be 200910101848.2 Chinese invention patent application disclose a kind of reducing substances from carbide slag-gypsum process desulfuration liquid be separated and remove method, tower reactor desulfurization slurry is delivered to cyclone, most of reducing substances in doctor solution is separated by cyclone, utilizes forced oxidation tank removed by reducing substances forced oxidation and return absorption tower tower reactor.The method is on the basis of original desulfurizer, set up the outer forced oxidation tank of tower.
Although above-mentioned two kinds of methods are the desulfurizers for white clay/Properties of Carbide Slag design, under the prerequisite ensureing desulfuration efficiency, effectively improve the quality of desulfurated plaster, but set up auxiliary equipment outside tower, floor space is large, and equipment cost is high, is unfavorable for the control of enterprise to cost.
Summary of the invention
The invention provides a kind of apparatus and method of white clay/carbide slag-gypsum wet flue gas desulfurizing, for white clay/Properties of Carbide Slag design absorption tower, spray desulfurization and bubbling oxidation all separately to be carried out, guarantee desulfuration efficiency and gypsum qualitt in absorption tower, simplified apparatus, reduces costs.
A device for white clay/carbide slag-gypsum wet flue gas desulfurizing,
Comprise absorption tower, the top on described absorption tower and middle part are respectively equipped with exhanst gas outlet and the first smoke inlet, demister is followed successively by from top to bottom in described absorption tower, spray equipment, spray chamber and tower reactor, described tower reactor is by be arranged in tower reactor and to be separated into slurries room and bubbling room perpendicular to the sidewall at the bottom of tower, described bubbling outdoor connects gypsum pump, described bubbling chamber interior is provided with agitator, oxidation air and some bubbling pipes, the tower wall on described absorption tower is provided with the second smoke inlet be communicated with described bubbling pipe, described sidewall is provided with the overfall be communicated with described slurries room.
Part raw flue gas enters spray chamber by the first smoke inlet, part raw flue gas enters bubbling room from the second smoke inlet, spray chamber is entered again by bubbling room, move upward after mixing with the raw flue gas from the first smoke inlet, with the reverse haptoreaction of white clay slurries of spray, gained desulfurization slurry falls in slurries room, enter in bubbling room by overfall overflow, react with the smoke contacts from the second smoke inlet, reduce the pH of slurries, in bubbling room, pass into oxidation air simultaneously, at a low ph desulfurization slurry is oxidized to gypsum slurries, gypsum slurries is got rid of through gypsum pump, flue gas after purification is got rid of from exhanst gas outlet after demist.
The slurry pH value of bubbling indoor is reduced to 3.0 ~ 5.5 by the raw flue gas passing into bubbling indoor, be conducive to the oxidation of calcium sulfite, the pH value of slurries indoor controls 5.5 ~ 7.0, be conducive to the desulfurization improving flue gas, the desulfurization of flue gas and the oxidation of desulfurization slurry are in absorption tower inter-sync and independently carry out, both ensure desulfuration efficiency, ensure desulfurated plaster purity again.
Preferably, the indoor top of described bubbling is provided with upper spacer and lower clapboard, and the cavity that described upper spacer, lower clapboard, sidewall and absorbing tower wall surround is communicated with described second smoke inlet;
Described bubbling pipe is vertically arranged, described lower clapboard and described cavity connects are stretched in upper end;
Be provided with the escape pipe running through described upper spacer and lower clapboard, this escape pipe and described bubbling pipe misplace and arrange;
Be provided with between described bubbling room and spray equipment only for the flue gas redistributor that flue gas passes through, described flue gas redistributor is obliquely installed, and upper end is fixed on on the tower wall of described bubbling room homonymy, and lower end extends to above slurries room.
The lower end of escape pipe is communicated with the space below lower clapboard, upper end is communicated with spray chamber, the space that upper spacer, lower clapboard, sidewall and absorbing tower wall surround is relatively airtight, after raw flue gas enters cavity, first move downward in the desulfurization slurry entering bubbling room through bubbling pipe, upwards enter spray chamber through escape pipe again after reacting with desulfurization slurry, move upward together with after mixing with the raw flue gas from the first smoke inlet, discharge after spray washing and demist drying.Desulfurization slurry in flue gas and bubble tower reacts the sulfur dioxide sloughing a part, and the pH value of slurries is reduced, is beneficial to slurries and is oxidized.
If the raw flue gas from the first smoke inlet and the flue gas unmixed from bubbling room evenly directly rise, through spray equipment, easily cause flue gas flow on the same cross section of spray equipment uneven, content of sulfur dioxide is uneven, causes this desulfurizer desulfuration efficiency lower.
Therefore, in order to make and the flue gas of sprayed slurry counter current contacting flow velocity and even concentration everywhere, preferably, also division board is provided with in described absorption tower, the upper edge of described division board is connected with described flue gas redistributor lower end, lower edge extends in slurries room and be positioned at 40 ~ 50cm place below described overfall, and the gas approach at described first smoke inlet place runs through absorbing tower wall and is inlaid on this division board.
Space is left between described division board and absorbing tower wall, the lower edge of division board to extend in slurries room in slurries, the flue gas sent into from the first smoke inlet directly enters the space that division board and flue gas redistributor surround, the raw flue gas entered from the first smoke inlet so directly would not be crossed flue gas redistributor and be moved upward, but rises after flue gas redistributor place mixes with the flue gas from bubbling room again.
The first described smoke inlet and the second smoke inlet are in same level, if the first smoke inlet is too low, easily flooded by spray chamber slurries, flue gas can not circulate smoothly, if the first smoke inlet is too high, flue gas is not easy to mix with the flue gas through bubbling room.
The space size left between described division board and desulfurizing tower calculates: the falling speed of sprayed slurry drop in spray chamber calculates according to 6 ~ 8m/s, maximum desulfurization slurry amount when the circulating pump of spray chamber all comes into operation is known, just can calculate the maximum flow area of needs, this maximum flow area 1.2 ~ 1.5 times be just space size between division board and desulfurizing tower.
Described flue gas redistributor must have two conditions simultaneously, one must be able to make flue gas upwards pass through smoothly, its two spray equipment is sprayed under slurries be drained in slurries room, and do not make slurries pass through from flue gas redistributor, fall in the escape pipe of bubbling room and block escape pipe.
Therefore, preferred as one, described flue gas redistributor comprise with some smoke through hole base plate and to be positioned at above base plate and with smoke through hole calotte one to one.
More preferably, be provided with waterproof platform around the edge of described smoke through hole, described calotte is erected in this waterproof platform.
Described calotte is generally pinnacle shape or dome-shaped, and the height of waterproof platform is traditionally arranged to be 2 ~ 3cm, and the whole height of calotte and waterproof platform is traditionally arranged to be 5 ~ 6cm.
Flue gas is up moved by the smoke through hole on base plate, and the slurries under spray then drop on base plate through calotte, and washed away by rinse water, waterproof platform prevents in slurries and rinse water access aperture.
Because flue gas redistributor is positioned at below spray equipment, spray and lower slurries fall within flue gas redistributor, if can not flow away smoothly, slurries will be deposited on flue gas redistributor, block flue gas communication port, increase tower pressure, and desulphurization reaction can not be carried out smoothly.
Therefore, can flow into smoothly in slurries room to cause to fall and break to the slurries on flue gas redistributor, not to flue gas by impacting, preferably, the angle of described base plate and described absorption tower center line is 10 ~ 45 degree, is provided with rinse water shower above described flue gas redistributor.
Rinse water shower ejection rinse water washes away being deposited on the slurries of flue gas on distributor.
The place of the mainly reducing substances oxidation of bubbling room, gypsum crystallization, because gypsum nucleus is formed, crystal is grown up needs certain time of staying, therefore, gypsum slurries after desulfurization needs when gypsum crystal meets emission request are temporarily stored in bubbling room, this just requires that the space of bubbling room is larger, and the Main Function of slurries room is desulfurization, indoor for slurries slurries are delivered to spray equipment by slurry circulating pump, sulfur dioxide in spray-absorption flue gas, without the need to mass storage, therefore less to the space requirement of slurries room.
Therefore, preferred as one, the sectional area ratio of described slurries room and bubbling room is 1: 2 ~ 3.Require to be as the criterion with the satisfied spray of the indoor slurries of slurries and overflow, this sectional area refers to sectional area in the horizontal plane.
When absorption tower is normally run, the liquid level of slurries indoor can not be too low, when liquid level close to or lower than the lower end of division board, the partial fume that the first smoke inlet enters overflows from the space between division board and absorbing tower wall, makes spray-absorption flue gas uneven.But the liquid level of slurries indoor can not be too high, when liquid level close to or higher than lower clapboard time, have partial desulfurization gypsum slurries and enter escape pipe, ejection, causes bubbling room can not trouble-free operation.
Therefore, in order to the real-time liquid level to slurries indoor is observed, preferably, described absorbing tower wall is provided with peep hole, described peep hole upper end on lower clapboard and overfall along between and higher than on overfall along 20 ~ 30cm place, lower end under division board along and overfall under edge between and higher than under division board along 20 ~ 30cm place.
A kind of preferred technical side's scheme, described bubbling indoor are provided with liquid level gauge.
Because bubbling room is communicated with slurries room, liquid level gauge is set in bubbling indoor, liquid level in Display Drum bubble chamber, when liquid level is lower, and when can not obtain supply, illustrate that slurries room liquid level is also lower, need supply fresh slurry, when liquid level is higher, timely deslagging, remains that liquid level is near overfall.
Present invention also offers a kind of method utilizing described device to carry out white clay/carbide slag-gypsum wet flue gas desulfurizing, comprise: make desulfurizing agent with white clay/carbide slag, wet desulphurization is carried out to flue gas, a described flue gas part directly enters in the spray chamber of absorption tower by the first smoke inlet, a part enters bubbling room from the second smoke inlet through bubbling pipe, enter in the spray chamber of absorption tower by bubbling room again, with the reverse haptoreaction of white clay/carbide slag slurry of spray after the mixing of two parts flue gas, gained desulfurization slurry falls in slurries room, purifying smoke is discharged after demist drying, bubbling room is entered in desulfurization slurry overflow in slurries room, and the smoke contacts bloated with bubbling pipe reacts, and passes into oxidation air simultaneously, be oxidized to obtain gypsum slurries in bubbling room, and described gypsum slurries discharges Dehydration gypsum.
In described slurries room, pH is 5.5 ~ 7.0, guarantees neat stress sulfur dioxide qualified discharge; In described bubbling room, pH value is 3.0 ~ 5.5, and be oxidized from the reducing substances in white clay/carbide slag, the calcium sulfite oxidation in desulfurization slurry becomes calcium sulfate, obtained desulfurated plaster.
During desulfurization work, the former flue gas of part enters bubbling room, and the indoor desulfurization slurry of acidifying bubbling, makes desulfurization slurry pH value at 3.0-5.5, then enter spray chamber from bubbling room, mix with the former flue gas directly passing into spray chamber; Mixed flue gas rises and contacts with sprayed slurry, completes SO 2 from fume absorption process; Flue gas after purification is discharged through exhanst gas outlet.
The sprayed slurry fallen is collected, is laid in slurries room, and in slurries room, desulfurization slurry flows into bubbling room by overfall, supply bubbling room slurries, and open the indoor agitator of bubbling and oxidation fan, oxidation air is entered in bubbling room by oxidation air.Indoor at bubbling, slurries are oxidized at low ph values, crystallization reaction, and the gypsum slurries met the demands pumps into hydrocyclone by gypsum pump, and the rare gypsum slurries after cyclonic separation is back to slurries room, continue to participate in desulfurization, the process of thick gypsum slurries deslagging.When the indoor liquid level of slurries reduces, by the white clay slurries that pipeline supply is fresh, and maintain sprayed slurry pH value at 5.5-7.0.
Beneficial effect of the present invention:
(1) tower reactor is by be arranged in tower reactor and to be separated into slurries room and bubbling room perpendicular to the sidewall at the bottom of tower, controls the pH value of bubbling room and slurries room respectively at 3.0-5.5,5.5-7.0.While the desulfuration efficiency that maintenance is higher, bubbling room adopts low ph value to run, and the oxygenation efficiency of calcium sulfite is higher, and the utilization rate of white clay/carbide slag improves, and gypsum qualitt improves.
(2) bubbling room adopts bubbling device, compares with spray equipment, and the gas-liquid contact of bubbling device completes in slurries indoor, does not need to set up gas-liquid contact space again.In absorption tower, bubbling room and slurries room are horizontal distribution, do not increase the total height on absorption tower.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structure chart of bubbling room section components;
Fig. 3 is the top view of upper spacer;
Fig. 4 is the top view of lower clapboard;
Fig. 5 is the structural representation of flue gas redistributor base plate;
Fig. 6 is the structural representation of calotte and waterproof platform;
Fig. 7 is the A direction view of Fig. 6;
Fig. 8 is process chart of the present invention.
Detailed description of the invention
As shown in Figure 1, a kind of device of white clay/carbide slag-gypsum wet flue gas desulfurizing, comprise absorption tower 1, absorption tower 1 adopts spray column, tower top arranges exhanst gas outlet 15, and demister tower inner top arranges below demister 14, demister 14 and arranges spray equipment 13, and demister 14 and spray equipment 15 all adopt existing demist and spray equipment, bottom in absorption tower 1 is the tower reactor storing slurries, and the space between tower reactor and spray equipment 13 is spray chamber.
Arrange perpendicular to the sidewall 23 at the bottom of tower in the tower reactor on absorption tower 1, tower reactor is separated into slurries room 5 and bubbling room 6 by sidewall 23, bubbling room 6 and slurries room 5 are 3: 1 at the sectional area ratio of horizontal plane, in bubbling room 6 and slurries room 5, agitator 21 is all set, agitator 21 is for stirring side, and the side in bubbling room 6 arranges oxidation air 21, the external oxidation fan of oxidation air 21 near stirring, sidewall 23 is provided with overfall 19, and overfall 19 is communicated with slurries room 5 and bubbling room 6.
The top of bubbling room 6 arranges upper spacer 17, lower clapboard 18 is set below upper spacer 17, upper spacer 17, lower clapboard 18, sidewall 23 and absorption tower 1 tower wall surround the cavity of a relative closure, and absorption tower 1 tower wall arranges the second smoke inlet 11 with this cavity connects.Vertically arrange some bubbling pipes 7 below lower clapboard 18, lower clapboard 18 and cavity connects are stretched in the top of bubbling pipe 7, and bottom is unsettled; Escape pipe 24 that is some and bubbling pipe 7 interlaced arrangement is set between upper spacer 17 and lower clapboard 18, the top of escape pipe 24 is run through upper spacer 17 and is communicated with spray chamber, bottom is run through lower clapboard 18 and is communicated with space below lower clapboard 18, and overfall 19 is positioned at the below of lower clapboard 18.The top view of upper spacer 17 and lower clapboard 18 respectively as shown in Figure 3 and Figure 4.The bottom of bubbling room 6 is communicated with the entrance of gypsum pump 8, the outlet hydrocyclone 9 of gypsum pump 8.Slurries room 5 is communicated with two to three circulating pumps 4 entrance, and circulating pump 4 outlet is communicated with corresponding spray equipment.
The top of bubbling room 6 arranges flue gas redistributor 12, flue gas redistributor 12 is obliquely installed, one end is upward fixed on the tower wall above bubbling room 6, one end down extends to above slurries room 5, isolated with spray equipment 13 whole bubbling room 6, the angle between flue gas redistributor 12 and tower wall is 15 degree.
As shown in Fig. 5 ~ 7, for the structure of flue gas redistributor 12, comprise the base plate 1201 of the smoke through hole 1202 with some even arrangements, above base plate 1201, the high waterproof platform of 3cm 1204 is set around each smoke through hole 1202, each waterproof platform 1204 sets up a pinnacle shape calotte 1203, the whole height of calotte 1203 and waterproof platform 1204 is 6cm, and the junction of calotte 1203 and waterproof platform 1204 is as 5 indication places in Fig. 7.
Flue gas enters below spray equipment 13 from the space of logical smoke through hole 1202 and calotte 1203, and waterproof platform 1204 prevents sprayed slurry from entering in smoke through hole 1202.
Correspondingly with flue gas redistributor 12 position above flue gas redistributor 12 arrange rinse water shower 16, rinse water shower 16 is made up of the female pipe of spray and the some arms be arranged on the female pipe of spray.
Division board 3 is set in absorption tower 1, the upper edge of division board 3 is fixed with base plate 1201 one end down of flue gas redistributor 12, and lower edge is stretched in slurries room 5, and two vertical sides and tower wall are fixed, have certain space between division board 3 and tower wall, in present embodiment, the size in this space is 0.20m
2, the gas approach at the first smoke inlet 2 place runs through absorbing tower wall and is inlaid on this division board 3, and the lower edge of the first smoke inlet 2 is a little more than lower clapboard 18.When being full of slurries in slurries room 5, flue gas can not directly enter above flue gas redistributor 12, but mixes with the flue gas from bubbling room 6 below flue gas redistributor 12.
The tower wall of slurries room 5 is provided with peep hole 20, peep hole 20 on lower clapboard 18 and overfall 19 along between and upper end higher than on overfall 19 along 20cm place, lower end is between division board 3 times edges and overfall 9 times edges and higher than division board 3 times along 30cm place.
Be provided with liquid level gauge 10 in bubbling room 6, liquid level in Display Drum bubble chamber 6, be equipped with smoke inlet spray in the first smoke inlet 2 and the second smoke inlet 11, reduce entrance flue gas temperature.
Technological process of the present invention is as follows:
As illustrated in figures 1 and 8, former flue gas divides two-way to enter in the spray chamber on absorption tower 1 respectively by the first smoke inlet 2 and the second smoke inlet 11, and at flue gas redistributor 12, place collects, and rises, by spray equipment 13, demister 14, discharges from exhanst gas outlet 15.
Fresh white clay/carbide slag slurry 25 is input in slurries room 5 by white clay/carbide slag slurry supply pipe, and white clay/carbide slag slurry is accumulated in slurries room 5, and open side stirs simultaneously.When white clay/carbide slag slurry is accumulated to a certain amount of, ON cycle pump 4, open rinse water shower 16, white clay/carbide slag slurry is delivered to spray equipment 13, white clay/carbide slag slurry spray and sulfur dioxide in lower absorption flue gas, flue gas after purification is discharged through demister 14, exhanst gas outlet 15, and desulfurization slurry falls in overfall liquid chamber 5.
When in slurries room 5, desulfurization slurry liquid level reach a certain height, desulfurization slurry enters bubbling room 6 from overfall 19 overflow, the oxidation fan that the side of opening bubbling room 6 is stirred and is connected with oxidation air 10, when liquid level in bubbling room 6 there was not the outlet of bubbling pipe 7, flue gas from the second smoke inlet 11 contacts with desulfurization slurry, desulfurization slurry obtains acidifying, slurry pH value is down to 3.0 ~ 5.5, and under the effect of oxidation air, reducing substances in desulfurization slurry, calcium sulfite are oxidized, form gypsum slurries.
The gypsum slurries produced in bubbling room 6 is pumped to hydrocyclone 9 by gypsum pump 8, and the rare gypsum slurries 26 after cyclonic separation is back to slurries room 5 by return duct, and the thick gypsum slurries 27 of underflow is from the process of slag notch deslagging.
The trend of flue gas in bubbling room 6 is: flue gas enters in the cavity between upper spacer 17 and lower clapboard 18 by the second smoke inlet 11, enter in bubbling pipe 7 downwards, by bubbling pipe 7 bloat react with the slurry liquid contacts in bubbling room 6 backward on, enter spray chamber through the escape pipe 24 be arranged between upper spacer 17 and lower clapboard 18, rise after flue gas redistributor 12 place mixes with the former flue gas from the first smoke inlet 2.
Embodiment 1
Certain paper mill, 2 75t/h coal-burning boilers adopt this device and technique desulfurization, take white clay as desulfurizing agent, and bubbling room slurry pH value controls 4.5, and slurries room slurry pH value controls 6.8, and liquid-gas ratio selects 6L/m
3, import sulfur dioxide concentration 4600mg/m
3, outlet sulfur dioxide concentration is 200mg/m
3, desulfuration efficiency reaches 95.6%, and gypsum purity reaches 93%, and calcium sulfite oxidation rate reaches 96%.
Embodiment 2
Certain carbide produces PVC enterprise, and 3 130t/h coal-burning boilers adopt this device and technique desulfurization, and employing carbide slag is desulfurizing agent, and bubbling room slurry pH value controls 4.8, and slurries room slurry pH value controls 6.5, and liquid-gas ratio selects 9L/m
3, import sulfur dioxide concentration 3600mg/m
3, outlet sulfur dioxide concentration is 184mg/m
3, desulfuration efficiency reaches 94.9%, and gypsum purity reaches 91%, and calcium sulfite oxidation rate reaches 95%.
Claims (7)
1. the device of a white clay or carbide slag-gypsum wet flue gas desulfurizing, comprise absorption tower (1), the top on described absorption tower (1) and middle part are respectively equipped with exhanst gas outlet (15) and the first smoke inlet (2), demister (14) is followed successively by from top to bottom in described absorption tower (1), spray equipment (13), spray chamber and tower reactor, it is characterized in that, described tower reactor is by be arranged in tower reactor and to be separated into slurries room (5) and bubbling room (6) perpendicular to the sidewall (23) at the bottom of tower, the external gypsum pump (8) of described bubbling room (6), described bubbling room (6) inside is provided with agitator (22), oxidation air (21) and some bubbling pipes (7), the tower wall on described absorption tower (1) is provided with the second smoke inlet (11) be communicated with described bubbling pipe (7), described sidewall (23) is provided with the overfall (19) be communicated with described slurries room (5),
Described bubbling room (6) internal upper part is provided with upper spacer (17) and lower clapboard (18), and the cavity that described upper spacer (17), lower clapboard (18), sidewall (23) and absorption tower (1) tower wall surround is communicated with described second smoke inlet (11);
Described bubbling pipe (7) is vertically arranged, described lower clapboard (18) and described cavity connects are stretched in upper end;
Be provided with the escape pipe (24) running through described upper spacer (17) and lower clapboard (18), this escape pipe (24) and described bubbling pipe (7) misplace and arrange;
Be provided with only for the flue gas redistributor (12) that flue gas passes through between described bubbling room (6) and spray equipment (13), described flue gas redistributor (12) is obliquely installed, upper end is fixed on on the tower wall of described bubbling room (6) homonymy, and lower end extends to top, slurries room (5);
Division board (3) is also provided with in described absorption tower (1), the upper edge of described division board (3) is connected with described flue gas redistributor (12) lower end, lower edge extends in slurries room (5) and be positioned at 40 ~ 50cm place, described overfall (19) below, and the gas approach at described first smoke inlet (2) place runs through absorption tower (1) tower wall and is inlaid on this division board (3).
2. device according to claim 1, it is characterized in that, described flue gas redistributor (12) comprise with some smoke through hole (1202) base plate (1201) and be positioned at base plate (1201) top and with smoke through hole (1202) calotte (1203) one to one.
3. device according to claim 2, is characterized in that, is provided with waterproof platform (1204) around the edge of described smoke through hole (1202), and described calotte (1203) is erected in this waterproof platform (1204).
4. device according to claim 3, it is characterized in that, described base plate (1201) is 10 ~ 45 degree with the angle of described absorption tower (1) center line, and described flue gas redistributor (12) top is provided with rinse water shower (16).
5. device according to claim 4, is characterized in that, described slurries room (5) is 1:2 ~ 3 with the sectional area ratio of bubbling room (6).
6. device according to claim 5, it is characterized in that, described absorption tower (1) Ta Bishang is provided with peep hole (20), described peep hole (20) upper end be positioned at lower clapboard (18) and overfall (19) upper along between and higher than under edge under overfall (19) is positioned at division board (3) along 20 ~ 30cm place, lower end and overfall (19) between edge and higher than under division board (3) along 20 ~ 30cm place.
7. utilize the device described in claim 1 to carry out a method for white clay or carbide slag-gypsum wet flue gas desulfurizing, comprising:
Make desulfurizing agent with white clay or carbide slag, wet desulphurization carried out to flue gas,
It is characterized in that,
A described flue gas part directly enters in the spray chamber of absorption tower by the first smoke inlet, a part enters bubbling room from the second smoke inlet through bubbling pipe, enter in the spray chamber of absorption tower by bubbling room again, with the white clay of spray or the reverse haptoreaction of carbide slag slurry after the mixing of two parts flue gas, gained desulfurization slurry falls in slurries room, and purifying smoke is discharged after demist drying;
Bubbling room is entered in desulfurization slurry overflow in slurries room, and the smoke contacts bloated with bubbling pipe reacts, and passes into oxidation air simultaneously, be oxidized to obtain gypsum slurries in bubbling room, and described gypsum slurries discharges Dehydration gypsum; In described slurries room, pH is 5.5 ~ 7.0, and in described bubbling room, pH value is 3.0 ~ 5.5.
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| CN103055682B (en) * | 2012-12-31 | 2015-08-12 | 武汉凯迪工程技术研究总院有限公司 | Solid fuel power station discarded object comprehensive processing technique and equipment thereof |
| CN105396451B (en) * | 2015-12-03 | 2017-07-07 | 华北电力大学 | Caustic dip efficient removal SO in a kind of spray desulfurizing tower3Technique |
| CN107648988B (en) * | 2017-08-08 | 2023-08-15 | 华电电力科学研究院有限公司 | Device and method for adjusting desulfurization slurry supply flow through double loops |
| CN110559816B (en) * | 2018-06-05 | 2021-10-08 | 中国石油化工股份有限公司 | Flue gas desulfurization tower and flue gas dedusting, desulfurization and wastewater treatment process |
| CN108671739A (en) * | 2018-07-19 | 2018-10-19 | 华南理工大学 | A kind of spray scattering tower apparatus |
| CN109939554B (en) * | 2019-03-19 | 2021-07-20 | 华北电力大学（保定） | White mud desulfurization system and desulfurization method thereof |
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| CN111111408A (en) * | 2019-12-25 | 2020-05-08 | 临沂鲁明环保科技设备有限公司 | Pressurization reverse desulfurization and dust removal integrated equipment |
| CN111514732A (en) * | 2020-04-29 | 2020-08-11 | 宜兴市海纳环境工程有限公司 | Multi-pipe type dust removal and desulfurization integrated equipment |
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