CN102764580A - White mud/ carbide slag-gypsum wet flue gas desulfurization device and method - Google Patents

White mud/ carbide slag-gypsum wet flue gas desulfurization device and method Download PDF

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CN102764580A
CN102764580A CN2012102487094A CN201210248709A CN102764580A CN 102764580 A CN102764580 A CN 102764580A CN 2012102487094 A CN2012102487094 A CN 2012102487094A CN 201210248709 A CN201210248709 A CN 201210248709A CN 102764580 A CN102764580 A CN 102764580A
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chamber
flue gas
bubbling
slurries
tower
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CN102764580B (en
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程常杰
刘兴利
莫建松
盛海强
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Zhejiang Tianlan Environmental Protection Technology Co Ltd
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Zhejiang Tianlan Environmental Protection Technology Co Ltd
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Abstract

The invention discloses a white mud/carbide slag-gypsum wet flue gas desulfurization device and a white mud/ carbide slag-gypsum wet flue gas desulfurization method. The device comprises an absorption tower; the top and the middle part of the absorption tower are respectively provided with a flue gas outlet and a first flue gas inlet; a demister, a spraying device, a spraying chamber and a tower kettle are sequentially arranged in the absorption tower from top to bottom; the tower kettle is divided into a slurry chamber and a bubbling chamber by a side wall which is arranged in the tower kettle and is perpendicular to the tower bottom; the bubbling chamber is externally connected with a gypsum pump; a stirrer, an oxidation air pipe and a plurality of bubbling pipes are arranged in the bubbling chamber; the wall of the absorption tower is provided with a second flue gas inlet communicated with the bubbling pipes; and the side wall is provided with an overflow port communicated with the slurry chamber. According to the device and the method, the absorption tower is designed according to the property of white mud/carbide slag, spraying desulfurization is implemented in the spraying chamber, and bubbling oxidation of desulfurized slurry is implemented in the bubbling chamber, so that the spraying desulfurization and the bubbling oxidation are implemented separately in the absorption tower, the desulfurization efficiency and the quality of gypsum are ensured, equipment is simplified, and the cost is reduced.

Description

The apparatus and method of a kind of white clay/carbide slag-gypsum wet flue gas desulfurizing
Technical field
The present invention relates to the flue gas desulfurization technique field, be specifically related to the apparatus and method of a kind 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 the hollow-spraying-tower tower structure is simple, be difficult for producing fouling, but this device desulfuration efficiency is lower; The bubble tower desulfuration efficiency is higher, if but adopt water spray to flue gas cool-down, will cause systematic water balance unbalance, if adopt the slurries spray, will cause more serious fouling clogging to flue gas cool-down.At present, adopt the device and the existing a large amount of reports of technology of various ways combined desulfurization.
Application number is that 991139414.3 Chinese invention patent application discloses a kind of lime/gypsum method flue gas desulfurization technique and device; Flue gas after the dedusting is done the secondary desulfurization through spray liquid through porous plate bubble tower flue gas after desulfurization again in tower, flue gas after being purified adds hot driving through flue gas heater again after the cat head gas-liquid separator separates.Application number is that 201120100177.0 Chinese utility application discloses a kind of downstream injection bubbling wet desulphurization device, and flue gas gets into from cat head, and is descending, after spray equipment, bubbling device desulfurization, discharges from the middle part, has only a tower still in the desulfurizing tower.Application number is that 200810226157.0 Chinese invention patent application discloses a kind of bubble tower as desulfurizer and uses thereof; This invention also is to adopt flue gas to get into from top; Descending; The technology of after spray equipment, bubbling device desulfurization, discharging from the middle part, the different absorbents that is to use is a red mud.The desulfurizer that above-mentioned patent relates to all tower still has only a subregion, and flue gas is discharged after twice desulfurization.Though desulfuration efficiency is high, output gypsum quality is low, and influence utilizes again.
Application number is that 200720311773.7 Chinese utility application discloses a kind of flue gas desulfurization and oxidation unit; Tower body inside is divided into desulfurization chamber and the oxidizing chamber that upper gas is communicated with by vertical clapboard; Smoke inlet is located at desulfurization chamber one side of tower body; And exhanst gas outlet is located at oxidizing chamber one side of tower body, and this device is spray/Bubbling method integrated apparatus.Desulfurization chamber removes most SO in the flue gas 2, oxidizing chamber is with not removing SO in the flue gas 2And NO, Hg oxidation removal.The device that this patent relates to has two tower stills, and the tower still is not communicated with, and it is to remove reducing substances in the flue gas that the oxidation absorption liquid of spurting into oxidizing chamber mainly acts on.
White clay is the discarded object that produces in the 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 that is produced is about more than 90% of full pulping process; And paper white sludge is to be the sediment that raw material generates with the black liquor of pulp making, also just causes in the white clay COD content very high; Carbide slag is the discarded object that carbide is produced PVC, and main component is Ca (OH) 2But, contain reducing substanceses such as a large amount of sulphur anions, zeroth order sulphur, phenol, phosphorus in the carbide slag.Make desulfurizing agent with white clay/carbide slag, the reducing substances in white clay/carbide slag gets into slurries, and calcium sulfite oxidation is produced inhibitory action, influences final output gypsum quality.Said method all is not suitable for the flue gas desulfurization technique that white clay/carbide slag is made desulfurizing agent.
Application number is that 200810062830.1 Chinese invention patent application discloses the method and apparatus that a kind of white clay removes sulfur dioxide in flue gas, adopts the white clay slurries to make desulfurizing agent, sulfur in smoke is carried out two-part absorb desulfurization.In the desulfurizing tower bottom flue gas is carried out the phase I desulfurization, the doctor solution counter current contacting of flue gas and spray; On desulfurizing tower top flue gas is carried out the second stage desulfurization, flue gas and doctor solution be counter current contacting on the eddy flow plate, demist afterwards, discharging.Outside desulfurizing tower, be provided with high-order recycle slurry liquid chamber; 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 that high-order circulation stores; Be mainly used in flue gas desulfurization, the doctor solution pH value 3.0-5.5 that low level circulation stores is mainly used in the oxidation of desulfurization slurry.The serum pot of high-order circulation is positioned at outside the absorption tower in this device.
Application number is that 200910101848.2 Chinese invention patent application discloses the method that reducing substances separates and removes in a kind of acetylene sludge-gypsum process desulphurization liquid; Tower still desulfurization slurry is delivered to cyclone; Cyclone is separated the most of reducing substances in the doctor solution, utilizes the forced oxidation jar that the reducing substances forced oxidation is removed and returned and absorbs the Tata still.This method is on the basis of original desulfurizer, to have set up forced oxidation jar outside the tower.
Though above-mentioned two kinds of methods are the desulfurizers to white clay/carbide slag characteristics design, under the prerequisite that guarantees desulfuration efficiency, effectively improved the quality of desulfurated plaster; But tower has been set up auxiliary equipment outward; Floor space is big, and equipment cost is high, is unfavorable for the control of enterprise to cost.
Summary of the invention
The invention provides the apparatus and method of a kind of white clay/carbide slag-gypsum wet flue gas desulfurizing; To white clay/carbide slag characteristics design absorption tower, make spray desulfurization and bubbling oxidation all in the absorption tower and separate carrying out, assurance desulfuration efficiency and gypsum quality; Simplified apparatus reduces cost.
The device of a kind of white clay/carbide slag-gypsum wet flue gas desulfurizing,
Comprise the absorption tower; The top on said absorption tower and middle part are respectively equipped with the exhanst gas outlet and first smoke inlet; Be followed successively by demister, spray equipment, spray chamber and tower still in the said absorption tower from top to bottom; Said tower still is separated into slurries chamber and bubbling chamber by being arranged in the tower still and perpendicular to the sidewall at the bottom of the tower, the outdoor gypsum pump that connects of said bubbling, and said bubbling chamber interior is provided with agitator, oxidation airduct and some bubbling pipes; The tower wall on said absorption tower is provided with second smoke inlet that is communicated with said bubbling pipe, and said sidewall is provided with the overfall that is communicated with said slurries chamber.
Part raw flue gas gets into spray chamber through first smoke inlet, and a part of raw flue gas gets into the bubbling chamber from second smoke inlet, gets into spray chamber by the bubbling chamber again; With mix from the raw flue gas of first smoke inlet after move upward, with the spray the reverse haptoreaction of white clay slurries, the gained desulfurization slurry falls in the slurries chamber; Advance in the bubbling chamber through the overfall overflow,, reduce the pH of slurries with flue gas haptoreaction from second smoke inlet; In the bubbling chamber, feed oxidation air simultaneously; Under low pH, desulfurization slurry is oxidized to gypsum slurries, gypsum slurries is got rid of through the gypsum pump, and flue gas after being purified is got rid of from exhanst gas outlet after demist.
Feed the indoor raw flue gas slurry pH value that bubbling is indoor of bubbling and be reduced to 3.0~5.5; Help the oxidation of calcium sulfite; The indoor pH value of slurries is controlled at 5.5~7.0, helps improving the desulfurization of flue gas, the desulfurization of flue gas and the oxidation of the desulfurization slurry inter-sync and independently carrying out on the absorption tower; Both guarantee desulfuration efficiency, guaranteed desulfurated plaster purity again.
Preferably, the indoor top of said bubbling is provided with upper spacer and lower clapboard, and the cavity that said upper spacer, lower clapboard, sidewall and absorption Tata wall surround is communicated with said second smoke inlet;
Said bubbling pipe arranges that vertically the upper end is stretched into said lower clapboard and is communicated with said cavity;
Be provided with the escape pipe that runs through said upper spacer and lower clapboard, this escape pipe and the dislocation of said bubbling pipe are arranged;
Be provided with the flue gas redistributor that only supplies flue gas to pass through between said bubbling chamber and the spray equipment, said flue gas redistributor is obliquely installed, and the upper end is fixed on the tower wall with said bubbling chamber homonymy, and the lower end extends to top, slurries chamber.
The lower end of escape pipe is communicated with the space of lower clapboard below; The upper end is communicated with spray chamber, and the space that upper spacer, lower clapboard, sidewall and absorption Tata wall surround is airtight relatively, after raw flue gas gets into cavity; Move downward in the desulfurization slurry that gets into the bubbling chamber through bubbling pipe earlier; With upwards get into spray chamber again after the desulfurization slurry reaction through escape pipe, after mixing, move upward from the raw flue gas of first smoke inlet, after spray washing and demist drying, discharge.The sulfur dioxide of a part is sloughed in desulfurization slurry reaction in flue gas and the bubble tower, and the pH value of slurries is reduced, and is beneficial to the slurries oxidation.
If from the raw flue gas of first smoke inlet with from the evenly directly rising of flue gas unmixed of bubbling chamber; Through spray equipment; Cause easily through flue gas flow inequality on the same cross section of spray equipment, content of sulfur dioxide is uneven, causes this desulfurizer desulfuration efficiency lower.
Therefore; Flow velocity and concentration are even everywhere with the flue gas of sprayed slurry counter current contacting in order to make; Preferably; Also be provided with division board in the said absorption tower, the upper edge of said division board is connected with said flue gas redistributor lower end, the lower edge extends in the slurries chamber and be positioned at 40~50cm place, said overfall below, and the gas approach at the said first smoke inlet place runs through absorption Tata wall and is inlaid on this division board.
Leave the space between said division board and the absorption Tata wall; The lower edge of division board extends in the slurries chamber in the slurries; The flue gas of sending into from first smoke inlet directly gets into the space that division board and flue gas redistributor surround; The raw flue gas that gets into from first smoke inlet so just can directly not crossed the flue gas redistributor and moved upward, but rises after mixing with flue gas from the bubbling chamber at flue gas redistributor place again.
Described first smoke inlet and second smoke inlet are in same horizontal plane; If first smoke inlet is too low, flooded by the spray chamber slurries easily, flue gas can not circulate smoothly; If first smoke inlet is too high, flue gas is not easy to mix with the flue gas of process bubbling chamber.
The space size that leaves between described division board and the desulfurizing tower is calculated: the falling speed of sprayed slurry drop in spray chamber calculated 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 that needs, this maximum flow area 1.2~1.5 times just be that space between division board and the desulfurizing tower is big or small.
Said flue gas redistributor must have two conditions simultaneously; One of which must be able to make flue gas upwards pass through smoothly; Its two with the slurries drainage under the spray equipment spray to the slurries chamber, and slurries are passed through from the flue gas redistributor, fall in the escape pipe of bubbling chamber and stop up escape pipe.
Therefore, as a kind of preferred, said flue gas redistributor comprise the base plate that has some smoke through hole be positioned at the base plate top and with smoke through hole calotte one to one.
More preferably, be provided with the waterproof platform around the edge of said smoke through hole, said calotte is erected on this waterproof platform.
Said 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 up moves through the smoke through hole on the base plate, and the slurries under the spray then drop on the base plate through calotte, is washed away by rinse water, and the waterproof platform prevents that slurries and rinse water from getting in the hole.
Because the flue gas redistributor is positioned at spray equipment below, spray and slurries down fall within on the flue gas redistributor, if can not flow away smoothly, slurries will be deposited on the flue gas redistributor, stop up the flue gas communication port, increase the tower pressure, and desulphurization reaction can not be carried out smoothly.
Therefore; For the slurries that cause to fall and break to the flue gas redistributor can flow in the slurries chamber smoothly, not to flue gas pass through impact, preferably; The angle of said base plate and said absorption tower center line is 10~45 degree, and said flue gas redistributor top is provided with the rinse water shower.
Rinse water shower ejection rinse water will be deposited on the slurries of flue gas on distributor and wash away.
The bubbling chamber mainly is the place of reducing substances oxidation, gypsum crystallization, because the gypsum nucleus forms, crystal is grown up needs certain time of staying; Therefore; Gypsum slurries after desulfurization needs when gypsum crystal satisfies emission request temporarily are stored in the bubbling chamber, and this just requires the space of bubbling chamber bigger, and the main effect of slurries chamber is desulfurization; Slurry circulating pump is delivered to spray equipment with the indoor slurries of slurries; Spray absorbs sulfur in smoke, need not a large amount of storages, and is therefore less to the space requirement of slurries chamber.
Therefore, as a kind of preferred, the sectional area ratio of said slurries chamber and bubbling chamber is 1: 2~3.Require to be as the criterion with satisfied spray of the indoor slurries of slurries and overflow, this sectional area is meant the sectional area on horizontal plane.
When the absorption tower was normally moved, the indoor liquid level of slurries can not be too low, and when the approaching lower end that perhaps is lower than division board of liquid level, the partial fume that first smoke inlet gets into overflows from the space between division board and the absorption Tata wall, makes spray absorption flue gas inhomogeneous.But the indoor liquid level of slurries can not be too high, when liquid level near or when being higher than lower clapboard, have the partial desulfurization gypsum slurries and get into escape pipe, ejection causes the bubbling chamber can not trouble-free operation.
Therefore; In order in real time the indoor liquid level of slurries to be observed; Preferably; Said absorption Tata wall is provided with peep hole, and said peep hole upper end is between lower clapboard and the overfall upper edge and be higher than 20~30cm place, overfall upper edge, lower end between division board lower edge and overfall lower edge and be higher than 20~30cm place, division board lower edge.
A kind of preferred technology side scheme, the indoor liquid level gauge that is provided with of said bubbling.
Because bubbling chamber and slurries chamber are communicated with, at the indoor liquid level gauge that is provided with of bubbling, the interior liquid level of Display Drum bubble chamber, when liquid level lower; And in the time of can not obtaining supply, explain that slurries chamber liquid level is also lower, need the fresh slurries of supply; When liquid level was higher, in time deslagging remained liquid level near overfall.
The present invention also provides a kind of method of utilizing described device to carry out white clay/carbide slag-gypsum wet flue gas desulfurizing; Comprise: make desulfurizing agent with white clay/carbide slag; Flue gas is carried out wet desulphurization, and a said flue gas part is directly got in the spray chamber of absorption tower by first smoke inlet, and a part gets into the bubbling chamber from second smoke inlet through bubbling pipe; Get in the spray chamber of absorption tower by the bubbling chamber again; Two parts flue gas mixes back and the reverse haptoreaction of white clay/carbide slag slurry that sprays, and the gained desulfurization slurry falls in the slurries chamber, and flue is discharged after the demist drying; The bubbling chamber is entered in desulfurization slurry overflow in the slurries chamber, and the flue gas haptoreaction with bubbling pipe bloats feeds oxidation air simultaneously in the bubbling chamber, and oxidation gets gypsum slurries, and said gypsum slurries is discharged dehydration system gypsum.
PH is 5.5~7.0 in the said slurries chamber, guarantees clean SO 2 from fume qualified discharge; The pH value is 3.0~5.5 in the said bubbling chamber, will be from the reducing substances oxidation in white clay/carbide slag, and the calcium sulfite oxidation in the desulfurization slurry becomes calcium sulfate, makes desulfurated plaster.
During desulfurization work, the former flue gas of part gets into the bubbling chamber, and the indoor desulfurization slurry of acidifying bubbling makes desulfurization slurry pH value at 3.0-5.5, gets into spray chamber then from the bubbling chamber, mixes with the former flue gas of direct feeding spray chamber; Mixed flue gas rises and contacts with sprayed slurry, accomplishes the SO 2 from fume absorption process; Flue gas after being purified is discharged through exhanst gas outlet.
The sprayed slurry that falls is collected, is laid in the slurries chamber, and desulfurization slurry flows into the bubbling chamber through overfall in the slurries chamber, and supply bubbling chamber slurries are opened indoor agitator of bubbling and oxidation fan, and oxidation air gets in the bubbling chamber through the oxidation airduct.Indoor at bubbling, oxidation, crystallization reaction take place in slurries under low pH value, and the gypsum slurries that meets the demands pumps into hydrocyclone through the gypsum pump, and the rare gypsum slurries after the cyclonic separation is back to the slurries chamber, continue to participate in desulfurization, and thick gypsum slurries deslagging is handled.When the indoor liquid level of slurries reduces,, and keep sprayed slurry pH value at 5.5-7.0 through the fresh white clay slurries of pipeline supply.
Beneficial effect of the present invention:
(1) the tower still is separated into slurries chamber and bubbling chamber by being arranged in the tower still and perpendicular to the sidewall at the bottom of the tower, and the pH value of controlling bubbling chamber and slurries chamber respectively is at 3.0-5.5,5.5-7.0.In the higher desulfuration efficiency of maintenance, low pH value operation is adopted in the bubbling chamber, and the oxygenation efficiency of calcium sulfite is higher, and the utilization rate of white clay/carbide slag improves the raising of gypsum quality.
(2) bubbling device is adopted in the bubbling chamber, compares with spray equipment, and the gas-liquid contact of bubbling device does not need to set up the gas-liquid attaching space in the indoor completion of slurries again.In the absorption tower, bubbling chamber and slurries chamber are horizontal distribution, do not increase the total height on absorption tower.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structure chart of bubbling chamber part parts;
Fig. 3 is the vertical view of upper spacer;
Fig. 4 is the vertical 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 that the A of Fig. 6 is to view;
Fig. 8 is a process chart of the present invention.
The specific embodiment
As shown in Figure 1, the device of a kind of white clay/carbide slag-gypsum wet flue gas desulfurizing comprises absorption tower 1; Spray column is adopted on absorption tower 1; Cat head is provided with exhanst gas outlet 15, and demister tower inner top is provided with demister 14, demister 14 belows are provided with spray equipment 13, and demister 14 all adopts existing demist and spray equipment with spray equipment 15; Bottom in the absorption tower 1 is for storing the tower still of slurries, and the space between tower still and the spray equipment 13 is a spray chamber.
Be provided with in the tower still on absorption tower 1 perpendicular to the sidewall at the bottom of the tower 23, sidewall 23 is separated into slurries chamber 5 and bubbling chamber 6 with the tower still, and bubbling chamber 6 is 3: 1 with slurries chamber 5 at the sectional area ratio of horizontal plane; In bubbling chamber 6 and the slurries chamber 5 agitator 21 is set all; Agitator 21 stirs for side, and the side in bubbling chamber 6 is provided with oxidation airduct 21, oxidation airduct 21 external oxidation fans near stirring; Sidewall 23 is provided with overfall 19, and overfall 19 is communicated with slurries chamber 5 and bubbling chamber 6.
The top of bubbling chamber 6 is provided with upper spacer 17; Upper spacer 17 belows are provided with lower clapboard 18; Upper spacer 17, lower clapboard 18, sidewall 23 and absorption tower 1 tower wall surround the cavity of a relative closure, and second smoke inlet 11 that is communicated with this cavity is set on the 1 tower wall of absorption tower.Some bubbling pipes 7 are vertically arranged in lower clapboard 18 belows, and the top of bubbling pipe 7 is stretched into lower clapboard 18 and is communicated with cavity, and the bottom is unsettled; Between upper spacer 17 and lower clapboard 18, be provided with some and escape pipes 24 bubbling pipe 7 interlaced arrangement; The top of escape pipe 24 is run through upper spacer 17 and is communicated with spray chamber; The space that lower clapboard 18 is communicated with lower clapboard 18 belows is run through in the bottom, and overfall 19 is positioned at the below of lower clapboard 18.The vertical view of upper spacer 17 and lower clapboard 18 is respectively like Fig. 3 and shown in Figure 4.The bottom of bubbling chamber 6 is communicated with the inlet of gypsum pump 8, and the outlet of gypsum pump 8 is communicated with hydrocyclone 9.Slurries chamber 5 is communicated with two to three circulating pumps, 4 inlets, and circulating pump 4 outlets are communicated with corresponding spray equipment.
The top of bubbling chamber 6 is provided with flue gas redistributor 12; Flue gas redistributor 12 is obliquely installed; An end up is fixed on the tower wall of 6 tops, bubbling chamber; An end down extends to 5 tops, slurries chamber, and whole bubbling chamber 6 and spray equipment 13 are isolated, and the angle between flue gas redistributor 12 and the tower wall is 15 degree.
Shown in Fig. 5~7; Structure for flue gas redistributor 12; Comprise the base plate 1201 that has some smoke through hole of evenly arranging 1202, base plate 1201 tops are provided with the high waterproof platform 1204 of 3cm around each smoke through hole 1202, on each waterproof platform 1204, set up a pinnacle shape calotte 1203; The whole height of calotte 1203 and waterproof platform 1204 is 6cm, calotte 1203 and the junction of waterproof platform 1204 such as 5 indication places among Fig. 7.
Flue gas gets into spray equipment 13 belows from the space of logical smoke through hole 1202 and calotte 1203, and waterproof platform 1204 prevents that sprayed slurry from getting in the smoke through hole 1202.
The corresponding rinse water shower 16 that is provided with flue gas redistributor 12 positions above flue gas redistributor 12, rinse water shower 16 is made up of the female some arms managing and be arranged on the female pipe of spray of spray.
Division board 3 is set in the absorption tower 1; The base plate 1201 of the upper edge of division board 3 and flue gas redistributor 12 end is down fixed, and the lower edge is stretched in the slurries chamber 5, and two vertical sides and tower wall are fixed; Between division board 3 and the tower wall certain space is arranged, the size in this space is 0.20m in this embodiment 2, the gas approach at first smoke inlet, 2 places runs through absorption Tata wall and is inlaid on this division board 3, and the lower edge of first smoke inlet 2 is a little more than lower clapboard 18.When being full of slurries in the slurries chamber 5, flue gas can directly not get into flue gas redistributor 12 tops, but below flue gas redistributor 12, mixes with flue gas from bubbling chamber 6.
On the tower wall of slurries chamber 5, be provided with peep hole 20, peep hole 20 is higher than 20cm place, overfall 19 upper edge, lower end between division board 3 lower edges and overfall 9 lower edges and be higher than 30cm place, division board 3 lower edge between lower clapboard 18 and overfall 19 upper edges and upper end.
Be provided with liquid level gauge 10 in the bubbling chamber 6, liquid level in the Display Drum bubble chamber 6 is equipped with the smoke inlet spray in first smoke inlet 2 and second smoke inlet 11, reduce entrance flue gas temperature.
Technological process of the present invention is following:
Like Fig. 1 and shown in Figure 8, former flue gas divides two-way to pass through in the spray chamber on first smoke inlet 2 and second smoke inlet, 11 entering absorption towers 1 respectively, and 12 places compile at the flue gas redistributor, rises, and through spray equipment 13, demister 14, discharges from exhanst gas outlet 15.
Fresh white clay/carbide slag slurry 25 is input in the slurries chamber 5 through white clay/carbide slag slurry supply pipe, and white clay/carbide slag slurry is accumulated in slurries chamber 5, and open side stirs simultaneously.When white clay/carbide slag slurry is accumulated to when 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 sprays and the following sulfur in smoke that absorbs; Flue gas after being purified is discharged through demister 14, exhanst gas outlet 15, and desulfurization slurry falls in the overfall liquid chamber 5.
The desulfurization slurry liquid level reach a certain height in slurries chamber 5; Desulfurization slurry is gone into bubbling chamber 6 from overfall 19 overflows, and the side of opening bubbling chamber 6 stirs and the oxidation fan that links to each other with oxidation airduct 10, when liquid level there was not the outlet of bubbling pipe 7 in the bubbling chamber 6; Flue gas from second smoke inlet 11 contacts with desulfurization slurry; Desulfurization slurry obtains acidifying, and slurry pH value reduces to 3.0~5.5, and under the effect of oxidation air; Reducing substances, calcium sulfite in the desulfurization slurry are oxidized, form gypsum slurries.
The gypsum slurries that produces in the bubbling chamber 6 is pumped to hydrocyclone 9 by gypsum pump 8, and the rare gypsum slurries 26 after the cyclonic separation is back to slurries chamber 5 through return duct, and the thick gypsum slurries 27 of underflow is handled from the slag notch deslagging.
The trend of flue gas in bubbling chamber 6 is: flue gas is by in the cavity between second smoke inlet, 11 entering upper spacers 17 and the lower clapboard 18; Get in the bubbling pipe 7 downwards; By bubbling pipe 7 bloat with bubbling chamber 6 in the slurries haptoreaction after upwards; Escape pipe 24 through being arranged between upper spacer 17 and the lower clapboard 18 gets into spray chambers, mixes the back at flue gas redistributor 12 places with former flue gas from first smoke inlet 2 and rises.
Embodiment 1
Certain paper mill, 2 75t/h coal-burning boilers adopt this device and technology desulfurization, are desulfurizing agent with the white clay, and bubbling chamber slurry pH value is controlled at 4.5, and slurries chamber slurry pH value is controlled at 6.8, and liquid-gas ratio is selected 6L/m for use 3, import sulfur dioxide concentration 4600mg/m 3, the outlet sulfur dioxide concentration is 200mg/m 3, desulfuration efficiency reaches 95.6%, and gypsum purity reaches 93%, and the calcium sulfite oxidation rate reaches 96%.
Embodiment 2
Certain carbide is produced PVC enterprise, and 3 130t/h coal-burning boilers adopt this device and technology desulfurization, and the employing carbide slag is a desulfurizing agent, and bubbling chamber slurry pH value is controlled at 4.8, and slurries chamber slurry pH value is controlled at 6.5, and liquid-gas ratio is selected 9L/m for use 3, import sulfur dioxide concentration 3600mg/m 3, the outlet sulfur dioxide concentration is 184mg/m 3, desulfuration efficiency reaches 94.9%, and gypsum purity reaches 91%, and the calcium sulfite oxidation rate reaches 95%.

Claims (10)

1. the device of white clay/carbide slag-gypsum wet flue gas desulfurizing; Comprise absorption tower (1); The top on said absorption tower (1) and middle part are respectively equipped with exhanst gas outlet (15) and first smoke inlet (2); Be followed successively by demister (14), spray equipment (13), spray chamber and tower still in the said absorption tower (1) from top to bottom, it is characterized in that, said tower still is separated into slurries chamber (5) and bubbling chamber (6) by being arranged in the tower still and perpendicular to the sidewall at the bottom of the tower (23); The external gypsum pump in said bubbling chamber (6) (8); Inside, said bubbling chamber (6) is provided with agitator (22), oxidation airduct (21) and some bubbling pipes (7), and the tower wall of said absorption tower (1) is provided with second smoke inlet (11) that is communicated with said bubbling pipe (7), and said sidewall (23) is provided with the overfall (19) that is communicated with said slurries chamber (5).
2. device according to claim 1 is characterized in that,
Said bubbling chamber (6) internal upper part is provided with upper spacer (17) and lower clapboard (18), and the cavity that said upper spacer (17), lower clapboard (18), sidewall (23) and absorption tower (1) tower wall surround is communicated with said second smoke inlet (11);
Said bubbling pipe (7) arranges that vertically the upper end is stretched into said lower clapboard (18) and is communicated with said cavity;
Be provided with the escape pipe (24) that runs through said upper spacer (17) and lower clapboard (18), this escape pipe (24) is arranged with said bubbling pipe (7) dislocation;
Be provided with the flue gas redistributor (12) that only supplies flue gas to pass through between said bubbling chamber (6) and the spray equipment (13), said flue gas redistributor (12) is obliquely installed, and the upper end is fixed on the tower wall with said bubbling chamber (6) homonymy, and the lower end extends to top, slurries chamber (5).
3. device according to claim 2; It is characterized in that; Also be provided with division board (3) in the said absorption tower (1); The upper edge of said division board (3) is connected with said flue gas redistributor (12) lower end, the lower edge extends in the slurries chamber (5) and be positioned at 40~50cm place, said overfall (19) below, and the gas approach that said first smoke inlet (2) is located runs through absorption tower (1) tower wall and is inlaid on this division board (3).
4. device according to claim 3 is characterized in that, said flue gas redistributor (12) comprise the base plate (1201) that has some smoke through hole (1202) and be positioned at base plate (1201) top and with smoke through hole (1202) calotte (1203) one to one.
5. device according to claim 4 is characterized in that, is provided with waterproof platform (1204) around the edge of said smoke through hole (1202), and said calotte (1203) is erected on this waterproof platform (1204).
6. device according to claim 5 is characterized in that, said base plate (1201) is 10~45 degree with the angle of said absorption tower (1) center line, and said flue gas redistributor (12) top is provided with rinse water shower (16).
7. device according to claim 6 is characterized in that, said slurries chamber (5) is 1: 2~3 with the sectional area ratio of bubbling chamber (6).
8. device according to claim 7; It is characterized in that; Said absorption tower (1) Ta Bishang is provided with peep hole (20), said peep hole (20) upper end be positioned between lower clapboard (18) and overfall (19) upper edge and be higher than 20~30cm place, overfall (19) upper edge, the lower end is positioned between division board (3) lower edge and overfall (19) lower edge and be higher than 20~30cm place, division board (3) lower edge.
9. method of utilizing the described device of claim 1 to carry out white clay/carbide slag-gypsum wet flue gas desulfurizing comprises:
Make desulfurizing agent with white clay/carbide slag, flue gas carried out wet desulphurization,
It is characterized in that,
A said flue gas part is directly got in the spray chamber of absorption tower by first smoke inlet; A part gets into the bubbling chamber from second smoke inlet through bubbling pipe; Get in the spray chamber of absorption tower by the bubbling chamber again; Two parts flue gas mixes back and the reverse haptoreaction of white clay/carbide slag slurry that sprays, and the gained desulfurization slurry falls in the slurries chamber, and flue is discharged after the demist drying;
The bubbling chamber is entered in desulfurization slurry overflow in the slurries chamber, and the flue gas haptoreaction with bubbling pipe bloats feeds oxidation air simultaneously in the bubbling chamber, and oxidation gets gypsum slurries, and said gypsum slurries is discharged dehydration system gypsum.
10. method according to claim 9 is characterized in that, pH is 5.5~7.0 in the said slurries chamber, and the pH value is 3.0~5.5 in the said bubbling chamber.
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