CN103071369B - Seawater desulfurization system suitable for frequency change of coal quality - Google Patents
Seawater desulfurization system suitable for frequency change of coal quality Download PDFInfo
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- CN103071369B CN103071369B CN201310023177.9A CN201310023177A CN103071369B CN 103071369 B CN103071369 B CN 103071369B CN 201310023177 A CN201310023177 A CN 201310023177A CN 103071369 B CN103071369 B CN 103071369B
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Abstract
The invention provides a seawater desulfurization system suitable for frequency change of coal quality. The seawater desulfurization system comprises an absorption system and a water quality recovery system. As an annular spray layer is arranged on the topmost layer of an absorbing tower and high-concentration boiler blow-off water (drum boiler) or alkali-mixed seawater (direct current furnace) are jetted, the mass transfer power and the desulfurization efficiency near a wall face can be significantly increased, and therefore the overall desulfurization efficiency is increased. A liquid redistributor is arranged under the spray layer, so that the spray liquid near the wall face can be redistributed, and the spray liquid near the wall face is dispersed into droplets again. The specific surface area is increased, and the absorbing ability is enhanced. SO2 near the wall face is absorbed again, and further the desulfurization ability near the wall face is enhanced. During the frequency change of coal quality, the amount of the sprayed seawater in the spray layer (drum boiler) or the concentration of alkali liquor (direct current furnace) are controlled in an associated mode through a second SO2 measuring point, the concentration of sulfur dioxide at an outlet is controlled, and therefore the seawater desulfurization system is suitable for the condition of frequency change of coal quality.
Description
Technical field
The present invention relates to coal fired power plant desulphurization control technical field, particularly a kind ofly adapt to the Deuslfurizing system for sea water that ature of coal is changeable.
Background technology
China will can not change taking coal as main energy resource structure within very long a period of time in future, but the burning of coal can cause serious environmental problem, as the acid rain problem causing because of the discharge of oxysulfide.Along with the appearance of " thermal power plant's air pollution emission standard " GB13223-2011, Air Pollutant Emission limit value standard before in thermal power plant has reduced by 4 times, this can find out the resolution of China aspect acid rain improvement on the one hand, is also the test very large to desulfur technology on the other hand.
Flue gas desulfurization with seawater is mainly to utilize the natural basicity of seawater to absorb SO
2, seawater desulfurizing process investment is little, and without discarded object, technique is simple, and operation maintenance is convenient, does not have the problem such as fouling and obstruction, has bright development prospect.
Although flue gas sea water desulfuration technology has a lot of advantages, but engineering practice proves, still have some key technical problems to need to solve, subject matter is that sea water desulfuration is to utilize the natural basicity of seawater to carry out desulfurization, the natural basicity of seawater is limited, therefore sea water desulfuration technology is only only applicable to the desulfurization of middle low-sulfur coal, and further strict along with current discharge standard, and the coal accommodation of sea water desulfuration technology will further be dwindled.But the ature of coal of China alters a great deal, thermal power plant usually needs to determine operation coal according to the height of coal price, and tends to burning inferior coal.Under this background, the accommodation of sea water desulfuration technology is very little, is key points that sea water desulfuration technology is implemented and how to adapt to the national conditions that China's ature of coal is changeable.
Summary of the invention
The object of the present invention is to provide a kind of Deuslfurizing system for sea water that ature of coal is changeable that adapts to, thereby increase the coal accommodation of sea water desulfuration technology.
To achieve these goals, the present invention adopts following technical scheme:
Adapt to the Deuslfurizing system for sea water that ature of coal is changeable, comprise absorption system and quality recovery system;
Described absorption system comprises flue gas system and sea water service system;
Described flue gas system comprises FGD inlet baffle, booster fan, absorption tower, FGD outlet damper and wet chimney; The port of export of FGD inlet baffle is connected with the arrival end of booster fan, the booster fan port of export connects the arrival end on absorption tower, absorption tower is provided with preaeration tank, liquid re-distributor, spraying layer, annular spraying layer and demister from the bottom to top successively, the port of export at top, absorption tower connects the arrival end of FGD outlet damper, and the port of export of FGD outlet damper connects wet chimney;
Described sea water service system comprises distribution well, pump suction pond, the first seawater booster pump and the second seawater booster pump; The port of export of distribution well connects pump inhales the arrival end in pond, and the port of export that pump absorbs connects the arrival end of the first seawater booster pump and the second seawater booster pump; The port of export of the first seawater booster pump connects the preaeration tank on absorption tower; The port of export of the second seawater booster pump connects the spraying layer spray inlet end on absorption tower;
Described quality recovery system comprises oxidation fan, mixing pit, aeration tank, blowoff basin and Aeration fan; The arrival end of preaeration tank connects the port of export of oxidation fan, connect the port of export of the first seawater booster pump simultaneously, the port of export of preaeration tank connects the arrival end of mixing pit, the arrival end of mixing pit connects pump simultaneously and inhales the port of export in pond, the port of export of mixing pit connects the arrival end of aeration tank, the arrival end of aeration tank connects the port of export of Aeration fan simultaneously, and the port of export of aeration tank connects blowoff basin;
Spray liquid in annular spraying layer is boiler blowdown water or mixes Aral Sea water; The bottom of annular spraying layer is provided with some spouts and sprays to wall direction, and the wall after injection flows to into liquid re-distributor and distributes, makes near the spray liquid of wall again disperse to become droplet and further absorbs near the SO of wall
2.
The present invention further improves and is: in the time that this Deuslfurizing system for sea water connects drum boiler, described absorption system also comprises the foul drainage system that boiler blowdown water is provided, and described foul drainage system comprises boiler-steam dome, blowdown system, sedimentation basin and heat exchanger; The port of export of boiler-steam dome connects the arrival end of blowdown system, the port of export of blowdown system connects the arrival end of sedimentation basin, the port of export of sedimentation basin connects the arrival end of heat exchanger, and the port of export of heat exchanger connects the spray inlet end of the annular spraying layer in absorption tower.
The present invention further improves and is: heat exchanger adopts double pipe heat exchanger, and inner tube passes into sewer, and outer tube passes into demineralized water; The arrival end of inner tube is connected with the port of export of sedimentation basin, and the port of export of inner tube is connected with the spray inlet end of the annular spraying layer in absorption tower.
The present invention further improves and is: between the port of export of FGD outlet damper and wet chimney, be provided with the 2nd SO
2measuring point; By regulating the amount of the sprayed sea water in the spraying layer under annular spraying layer to regulate the absorption efficiency on absorption tower; The amount of the sprayed sea water in spraying layer is by the 2nd SO
2measuring point is associated to be controlled.
The present invention further improves and is: in the time that this Deuslfurizing system for sea water connects Once-through Boiler, the alkali lye of the alkali lye system that provides is also provided described absorption system; Described alkali lye system comprises alkali liquid tank, adds alkali pump and the 3rd seawater booster pump; Pump is inhaled the entrance of outlet connection the 3rd seawater booster pump in pond, the port of export of alkali liquid tank is connected with the arrival end that adds alkali pump simultaneously, add the spray inlet end that enters the annular spraying layer in absorption tower together with the seawater blending that alkali delivery side of pump and the 3rd seawater booster pump outlet flow out, provide to annular spraying layer and mix Aral Sea water.
The present invention further improves and is: between the port of export of FGD outlet damper and wet chimney, be provided with the 2nd SO
2measuring point; By regulating spray liquid concentration in annular spraying layer to regulate the absorption efficiency on absorption tower; Spray liquid concentration is by the 2nd SO
2measuring point is associated to be controlled.
The present invention further improves and is: the absorption liquid after desulfurization enters the preaeration tank of bottom, absorption tower, simultaneously blending fresh seawater and carry out preaeration in preaeration tank, the mixed liquor of absorption liquid and fresh seawater enters mixing pit again to be mixed with the fresh seawater of another part, enter again aeration tank and carry out aeration recovery water quality, after aeration, discharge by blowoff basin.
The present invention further improves and is: the blending ratio of the absorption liquid after the fresh seawater passing in preaeration tank and desulfurization is 0.8; Be fresh seawater volume with desulfurization after the ratio of volume of absorption liquid be 0.8:1.
Further improvement of the present invention is:, described liquid re-distributor is positioned under spraying layer, on the entrance of absorption tower; Liquid re-distributor comprises some blocks of two-layer interlaced arrangement; Block is oblique triangular prism shape, comprise end face, the first bottom surface, the second bottom surface, the first baffle plate and second baffle, wherein end face and absorption tower wall oblique lower layout at 45 °, end face is flat board or corrugated plating, the angle being arranged between the first bottom surface and second bottom surface of end face below is less than 90 °, and the first baffle plate and second baffle are vertically fixed on end face both sides.
The present invention further improves and is: the width of the end face of upper strata block is more than or equal to the gap width between the end that adjacent lower floor block is fixed on absorption tower inwall.
At the entrance on absorption tower and enter on the pipeline before wet chimney and be equipped with SO
2measuring point, wherein the measuring point that enters to wet before chimney with control function.For the corresponding Deuslfurizing system for sea water of drum boiler, this control point is associated with the seawater amount that sprays into absorption tower.For Once-through Boiler for Deuslfurizing system for sea water, this control point is associated with the alkali number of mixing in seawater.
With respect to prior art, the major advantage of system of the present invention is:
1, the superiors of the present invention spraying layer adopts annular spraying layer can significantly improve desulfuration efficiency.Reason is as follows: along with the rising of flue gas, its sulfur content reduces gradually, and therefore mass transfer power also reduces.In order to improve the mass transfer power on upper strata, can improve on the one hand the basicity of seawater, can increase on the other hand spray flux.In fact, absorption tower central authorities seawater area coverage is larger, and absorption efficiency is very high, and surrounding is because adherent impact, and desulfuration efficiency is low.What the annular spraying layer adopting in the present invention sprayed is the mixing Aral Sea water (comprise boiler blowdown water or mix the seawater of alkali) and spray to wall direction of high concentration, thereby can improve to a great extent near desulfuration efficiency wall, and then improves total desulfuration efficiency.
2, the present invention is provided with liquid re-distributor and can redistributes near spray liquid wall under spraying layer on the entrance of absorption tower, make near the spray liquid of wall again disperse to become droplet, specific area increases, and absorbability strengthens, and again absorbs near the SO of wall
2, further strengthen near the desulphurizing ability of wall; Two bottom surfaces of liquid re-distributor form wedge shape, can obviously reduce the flow resistance of flue gas; Two baffle plates that are arranged in liquid re-distributor end face both sides can effectively prevent that the liquid of collecting from flowing out from both sides.
3, in the present invention, bottom, absorption tower has increased preaeration tank, thereby has reduced the pressure of follow-up aeration, improves aeration effect, saves the floor space of Deuslfurizing system for sea water.In preaeration tank, mix fresh seawater and blending ratio is 0.8, can effectively prevent absorbed SO on the one hand
2overflow, the mode of limit aeration limit blending can reduce the dilution of absorption liquid on the other hand, improves mass transfer power, reaches than the direct better oxidation effectiveness of this mode of aeration after blending fresh liquid in mixing pit.
4, corresponding to drum boiler, boiler blowdown water utilizes the object that can reach the treatment of wastes with processes of wastes against one another completely, by regulating the sprayed sea water amount of spraying layer under annular spraying layer, thereby can regulate the absorption efficiency on absorption tower to adapt to the variation of ature of coal.Need in the sprayed sea water of annular spraying layer, mix alkali corresponding to Once-through Boiler, thereby thereby can regulate the absorption efficiency on absorption tower to adapt to the variation of ature of coal by changing the concentration of alkali lye.
Brief description of the drawings
Fig. 1 is the Deuslfurizing system for sea water figure corresponding to drum boiler of the present invention;
Fig. 2 is the Deuslfurizing system for sea water figure corresponding to Once-through Boiler of the present invention;
Fig. 3 is liquid re-distributor schematic diagram.
In figure: 1, FGD inlet baffle, 2, booster fan, 3, a SO
2measuring point, 4, absorption tower, 5, FGD outlet damper, 6, the 2nd SO
2measuring point, 7, wet chimney, 8, boiler-steam dome, 9, blowdown system, 10, sedimentation basin, 11, heat exchanger, 12, demineralized water booster pump, 13, distribution well, 14, pump is inhaled pond, 151, the first seawater booster pump, 152, the second seawater booster pump, 153, the 3rd seawater booster pump, 16, oxidation fan, 17, mixing pit, 18, aeration tank, 19, blowoff basin, 20, Aeration fan, 21, seawater, 22, demineralized water, 23, absorption liquid, 24, sewer, 25, flue gas after dedusting, 26, air, 27, valve, 28, sea, 29, to oxygen-eliminating device, 30, to low-temperature heater, 31, preaeration tank, 70, liquid re-distributor, 701, end face, 702, the first bottom surface, 703, the second bottom surface, 704, the first baffle plate, 705, second baffle, 32, spraying layer, 33, annular spraying layer, 34, demister, 80, alkali liquid tank, 90, add alkali pump.
Instrument code implication in Fig. 1, Fig. 2 is in table 1.
Table 1
| Code | Code meaning | Code | Code meaning |
| T | Temperature | P | Pressure |
| F | Flow | SO 2 | Sulfur dioxide concentration |
| pH | PH value | I | Show |
| C | Control | ? | ? |
Detailed description of the invention
Shown in Fig. 1, mainly comprise absorption system and quality recovery system corresponding to the changeable Deuslfurizing system for sea water of the adaptation ature of coal of drum boiler, basic procedure connected mode is as follows:
The connected mode of absorption system flue gas flow: after dedusting, flue gas 25 enters the arrival end of FGD inlet baffle 1, the port of export of FGD inlet baffle 1 is connected with the arrival end of booster fan 2, and booster fan 2 ports of export connect a SO
2the arrival end of measuring point 3, a SO
2the port of export of measuring point 3 connects the arrival end on absorption tower 4, flue gas is successively through the liquid re-distributor 70 in absorption tower 4, spraying layer 32, annular spraying layer 33, demister 34, arrive the port of export on absorption tower 4, the port of export on absorption tower 4 connects the arrival end of FGD outlet damper 5, and the port of export of FGD outlet damper 5 connects the 2nd SO
2the arrival end of measuring point 6, the 2nd SO
2the port of export of measuring point 6 connects the operation of discharging fume of wet chimney 7.
The connected mode of absorption system seawater flow process: seawater 21 enters the entrance of distribution well 13, the port of export of distribution well 13 connects the rear connection pump of valve 27 and inhales the arrival end in pond 14, the port of export in pump suction pond 14 connects the arrival end of the first seawater booster pump 151 and the second seawater booster pump 152, and the port of export of the second seawater booster pump 152 connects the spraying layer 32 spray inlet ends on absorption tower 4.
The connected mode of absorption system sewer flow process: the port of export of boiler-steam dome 8 connects the arrival end of blowdown system 9, the port of export of blowdown system 9 connects the arrival end of sedimentation basin 10, the port of export of sedimentation basin 10 connects the arrival end of heat exchanger 11, and the port of export of heat exchanger 11 connects the spray inlet end of the annular spraying layer 33 in absorption tower 4.
The connected mode of quality recovery system: absorption liquid 23 enters preaeration tank 31, the arrival end of preaeration tank 31 connects the port of export of oxidation fan 16, connect the port of export of the first seawater booster pump 151 simultaneously, the port of export of preaeration tank 31 connects the arrival end of mixing pit 17, the arrival end of mixing pit 17 connects pump simultaneously and inhales the port of export in pond 14, the port of export of mixing pit 17 connects the arrival end of aeration tank 18, the arrival end of aeration tank 18 connects the port of export of Aeration fan 20 simultaneously, and the port of export of aeration tank 18 pond 19 of running in connects sea 28 and carries out draining.
Heat exchanger 11 adopts double pipe heat exchanger, and inner tube is walked sewer 24, and outer tube is walked demineralized water 22, and the arrival end of inner tube is connected with the port of export of sedimentation basin 10, and the port of export of inner tube is connected with the spray inlet end of the annular spraying layer 33 in absorption tower 4.The outer tube that demineralized water 22 enters heat exchanger 11 heats.
Shown in Fig. 2, be mainly divided into absorption system and quality recovery system corresponding to the changeable Deuslfurizing system for sea water of the adaptation ature of coal of Once-through Boiler, basic procedure connected mode is as follows:
Equal identical with corresponding to drum boiler corresponding to absorption system flue gas flow, the connected mode of absorption system seawater flow process and the connected mode of quality recovery system of Once-through Boiler.Because there is not continuous blowdown system of boiler water in Once-through Boiler, thus there is not the connected mode of absorption system sewer flow process, and there is the connected mode of absorption system alkali lye flow process.
The connected mode of absorption system alkali lye flow process: the entrance that pump is inhaled outlet connection the 3rd seawater booster pump 153 in pond 14 is connected, simultaneously the port of export of alkali liquid tank 80 is connected with the arrival end that adds alkali pump 90, and the outlet that adds alkali pump 90 enters the spray inlet end of the annular spraying layer 33 in absorption tower 4 together with exporting seawater 21 blending of coming with the 3rd seawater booster pump 153.
With reference to Fig. 3, liquid re-distributor 70 is positioned under spraying layer 32, on 4 entrances of absorption tower; Liquid re-distributor 70 comprises some blocks of two-layer interlaced arrangement; Block is oblique triangular prism shape, be divided into end face 701, the first bottom surface 702 and the second bottom surface 703, the first baffle plate 704 and second baffle 705, wherein end face 701 and absorption tower 4 wall oblique lower layout at 45 °, end face 701 can be flat board or corrugated plating, and the angle being arranged between the first bottom surface 702 and second bottom surface 703 of end face 701 belows is less than 90 °, and the first baffle plate 704 and second baffle 705 are vertically fixed on end face 701 both sides.The end face 701 that near spray liquid 23 4 walls of absorption tower can be fallen liquid re-distributor 70 absorption that again distributes.The width of the end face 701 of upper strata block is more than or equal to the gap width between the end that adjacent lower floor block is fixed on absorption tower inwall, can make like this liquid homomergic flow of absorption tower inwall on upper strata block or lower floor's block, then flow down along the front end of upper strata block or lower floor's block, make near the spray liquid of wall again disperse to become droplet and further absorb near the SO of wall
2.
The operation principle corresponding to the changeable Deuslfurizing system for sea water of the adaptation ature of coal of drum boiler shown in Fig. 1 is as follows:
1) after boiler blowdown water 24 and demineralized water 22 heat exchange, temperature is down to 50 DEG C by 157 DEG C, and the temperature of boiler blowdown water 24 reduces, and is conducive to improve desulfuration efficiency.Boiler blowdown water 24 sprays after entering annular spraying layer 33, and annular spraying layer 33 can significantly improve near the absorption efficiency 4 walls of absorption tower.Simultaneously, the pH value of boiler blow-off 24 can reach 10 ~ 14, be greater than the pH value of seawater 21, thereby annular spraying layer 23 can avoid 4 tops, absorption tower while adopting boiler blowdown water 24 as absorption liquid 23 mass transfer power that cause and seawater weakens because amount of sulfur contenting in smoke reduces, can significantly improve the mass transfer power of absorption tower 4 top absorption processes.Because the application of boiler blowdown water 24 can embody the thought of the treatment of wastes with processes of wastes against one another, so no matter how ature of coal changes, boiler blowdown water is all whole application.In the time that ature of coal changes, for example, when sulfur content increases, can improve desulfuration efficiency, concrete grammar by the spray flux that improves seawater 21: by the 2nd SO
2the control of measuring point 6 and the second seawater booster pump 152 is associated, by regulating the second seawater booster pump 152 to regulate seawater spraying amount and then adapting to the variation of ature of coal.
2) in the bottom on absorption tower 4, preaeration tank 31 is set, simultaneously preaeration adopts the mode of limit blending fresh seawater (blending ratio is 0.8) limit aeration, and absorption liquid is through a preaeration process, pH 1.5 left and right that raise.If absorption liquid 23 does not carry out a preaeration process in advance, but similar traditional Deuslfurizing system for sea water absorption liquid 23 enters aeration tank 18 after directly entering mixing pit 17, can there is following shortcoming: while first entering mixing pit, because the pH value of absorption liquid 23 is very low, in mixing pit 17, be very easy to overflow sour gas, next absorption liquid 23 enters mixing pit 17 to be mixed, be actually absorption liquid 23 has been carried out to dilution to a great extent, can reduce the oxidation effectiveness of follow-up aeration process, increase the aeration investment of follow-up aeration process.
The operation principle corresponding to the changeable Deuslfurizing system for sea water of the adaptation ature of coal of Once-through Boiler shown in Fig. 2 is as follows:
Alkali liquid tank 80 alkali lye is out by adding alkali pump 90 and seawater 21 blending that enter annular spraying layer 33, is that the absorption efficiency of adjustable desulfurizing tower is to adapt to the variation of ature of coal by the adjusting alkali lye amount in seawater of mixing.Concrete grammar: by the 2nd SO
2measuring point 6 and the control that adds alkali pump 90 are associated, and the size that adds alkali number by adjusting regulates and enters the variation that annular spraying layer 33 is mixed the pH value of Aral Sea water and then adapted to ature of coal.
The operation principle of the liquid re-distributor shown in Fig. 3 is as follows:
Near spray liquid 23 4 walls of absorption tower is fallen after the end face 701 of liquid re-distributor 70 because the metering function of the first baffle plate 704 and second baffle 705 flows down to form along end face 701 and is reuptaked near the SO in flue gas wall after droplet
2, further improve near the desulfuration efficiency of absorption tower 4 walls.Because the first bottom surface 702 and second bottom surface 703 of liquid re-distributor 70 form wedge shape, so resistance increment is little when the inlet flue gas on absorption tower 4 passes through liquid re-distributor 70.System of the present invention is owing to considering that current various places, all removing or lead sealing gas bypass, so this Deuslfurizing system for sea water no longer arranges gas bypass, but are provided with seawater bypass, and object is in the time that system breaks down, and can seawater be discharged by bypass.
In system of the present invention, seawater both can have been taken from ocean, and cooling if power plant adopts seawater to carry out, the seawater in system is the desirable process cooling water of using from condenser also, and intake equipment now can be set no longer specially, saved investment and operating cost.
Claims (8)
1. adapt to the Deuslfurizing system for sea water that ature of coal is changeable, it is characterized in that, comprise absorption system and quality recovery system;
Described absorption system comprises flue gas system and sea water service system;
Described flue gas system comprises FGD inlet baffle (1), booster fan (2), absorption tower (4), FGD outlet damper (5) and wet chimney (7); The port of export of FGD inlet baffle (1) is connected with the arrival end of booster fan (2), booster fan (2) port of export connects the arrival end on absorption tower (4), absorption tower (4) is provided with preaeration tank (31), liquid re-distributor (70), spraying layer (32), annular spraying layer (33) and demister (34) from the bottom to top successively, the port of export at top, absorption tower (4) connects the arrival end of FGD outlet damper (5), and the port of export of FGD outlet damper (5) connects wet chimney (7);
Described sea water service system comprises distribution well (13), pump suction pond (14), the first seawater booster pump (151) and the second seawater booster pump (152); The port of export of distribution well (13) connects pump inhales the arrival end in pond (14), and the port of export of pump absorption (14) connects the arrival end of the first seawater booster pump (151) and the second seawater booster pump (152); The port of export of the first seawater booster pump (151) connects the preaeration tank (31) on absorption tower (4); The port of export of the second seawater booster pump (152) connects spraying layer (32) the spray inlet end on absorption tower (4);
Described quality recovery system comprises oxidation fan (16), mixing pit (17), aeration tank (18), blowoff basin (19) and Aeration fan (20); The arrival end of preaeration tank (31) connects the port of export of oxidation fan (16), connect the port of export of the first seawater booster pump (151) simultaneously, the port of export of preaeration tank (31) connects the arrival end of mixing pit (17), the arrival end of mixing pit (17) connects pump simultaneously and inhales the port of export in pond (14), the port of export of mixing pit (17) connects the arrival end of aeration tank (18), the arrival end of aeration tank (18) connects the port of export of Aeration fan (20) simultaneously, and the port of export of aeration tank (18) connects blowoff basin (19);
Spray liquid in annular spraying layer (33) is boiler blowdown water or mixes Aral Sea water; The bottom of annular spraying layer (33) is provided with (4) the wall direction injection to absorption tower of some spouts, and the wall after injection flows to into liquid re-distributor (70) and distributes;
Described liquid re-distributor (70) is positioned under spraying layer (32), on the entrance of absorption tower (4), liquid re-distributor (70) comprises some blocks of two-layer interlaced arrangement, block is oblique triangular prism shape, comprise end face (701), the first bottom surface (702), the second bottom surface (703), the first baffle plate (704) and second baffle (705), wherein end face (701) and absorption tower (4) wall oblique lower layout at 45 °, end face (701) is flat board or corrugated plating, the angle being arranged between the first bottom surface (702) and the second bottom surface (703) of end face (701) below is less than 90 °, the first baffle plate (704) and second baffle (705) be vertically fixed on end face (701) along absorption tower (4) both sides radially.
2. a kind of Deuslfurizing system for sea water that ature of coal is changeable that adapts to according to claim 1, it is characterized in that, in the time that described Deuslfurizing system for sea water connects drum boiler, described absorption system also comprises the foul drainage system that boiler blowdown water is provided, and described foul drainage system comprises boiler-steam dome (8), blowdown system (9), sedimentation basin (10) and heat exchanger (11); The port of export of boiler-steam dome (8) connects the arrival end of blowdown system (9), the port of export of blowdown system (9) connects the arrival end of sedimentation basin (10), the port of export of sedimentation basin (10) connects the arrival end of heat exchanger (11), and the port of export of heat exchanger (11) connects the spray inlet end of the annular spraying layer (33) in absorption tower (4).
3. a kind of Deuslfurizing system for sea water that ature of coal is changeable that adapts to according to claim 2, is characterized in that, heat exchanger (11) adopts double pipe heat exchanger, and inner tube passes into sewer (24), and outer tube passes into demineralized water (22); The arrival end of inner tube is connected with the port of export of sedimentation basin (10), and the port of export of inner tube is connected with the spray inlet end of the annular spraying layer (33) in absorption tower (4).
4. a kind of Deuslfurizing system for sea water that ature of coal is changeable that adapts to according to claim 2, is characterized in that, between the port of export of FGD outlet damper (5) and wet chimney (7), is provided with the 2nd SO
2measuring point (6); By regulating the amount of the sprayed sea water in the spraying layer (32) under annular spraying layer (33) to regulate the absorption efficiency of absorption tower (4); The amount of the sprayed sea water in spraying layer (32) is by the 2nd SO
2measuring point (6) is associated to be controlled.
5. a kind of Deuslfurizing system for sea water that ature of coal is changeable that adapts to according to claim 1, is characterized in that, in the time that described Deuslfurizing system for sea water connects Once-through Boiler, the alkali lye of the alkali lye system that provides is also provided described absorption system; Described alkali lye system comprises alkali liquid tank (80), adds alkali pump (90) and the 3rd seawater booster pump (153); The entrance that pump is inhaled outlet connection the 3rd seawater booster pump (153) in pond (14) is connected, the port of export of alkali liquid tank (80) is connected with the arrival end that adds alkali pump (90) simultaneously, add the spray inlet end that enters the annular spraying layer (33) in absorption tower (4) together with the outlet of alkali pump (90) and seawater blending that the 3rd seawater booster pump (153) outlet is flowed out, provide to annular spraying layer (33) and mix Aral Sea water.
6. a kind of Deuslfurizing system for sea water that ature of coal is changeable that adapts to according to claim 5, is characterized in that, between the port of export of FGD outlet damper (5) and wet chimney (7), is provided with the 2nd SO
2measuring point (6); By regulating the interior spray liquid basicity of annular spraying layer (33) to regulate the absorption efficiency of absorption tower (4); Spray liquid basicity is by the 2nd SO
2measuring point (6) is associated to be controlled.
7. a kind of Deuslfurizing system for sea water that ature of coal is changeable that adapts to according to claim 1, it is characterized in that, absorption liquid after desulfurization enters the preaeration tank (31) of bottom, absorption tower (4), simultaneously blending fresh seawater and carry out preaeration in preaeration tank (31), the mixed liquor of absorption liquid and fresh seawater enters mixing pit (17) again to be mixed with the fresh seawater of another part, enter again aeration tank (18) and carry out aeration recovery water quality, after aeration, discharge by blowoff basin (19).
8. a kind of Deuslfurizing system for sea water that ature of coal is changeable that adapts to according to claim 7, is characterized in that, the blending ratio of the absorption liquid after the fresh seawater passing in preaeration tank (31) and desulfurization is 0.8; Be fresh seawater volume with desulfurization after the ratio of volume of absorption liquid be 0.8:1.
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|---|---|---|---|
| CN201310023177.9A CN103071369B (en) | 2013-01-22 | 2013-01-22 | Seawater desulfurization system suitable for frequency change of coal quality |
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|---|---|---|---|
| CN201310023177.9A CN103071369B (en) | 2013-01-22 | 2013-01-22 | Seawater desulfurization system suitable for frequency change of coal quality |
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| CN103071369B true CN103071369B (en) | 2014-12-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0352623A (en) * | 1989-07-21 | 1991-03-06 | Babcock Hitachi Kk | Wet type flue gas desulfurization facility utilizing sea water |
| DE29517697U1 (en) * | 1995-07-29 | 1996-01-18 | Gottfried Bischoff GmbH & Co. KG, 45136 Essen | Flue gas desulfurization plant |
| JPH09239233A (en) * | 1996-03-05 | 1997-09-16 | Mitsubishi Heavy Ind Ltd | Method and apparatus for exhaust gas desulfurization and ship carrying the apparatus |
| CN101670235A (en) * | 2008-09-12 | 2010-03-17 | 浙江菲达环保科技股份有限公司 | Integrated seawater desulfurization washing tower |
| CN201353476Y (en) * | 2009-02-01 | 2009-12-02 | 中冶集团北京冶金设备研究设计总院 | Seawater flue gas desulfurization spray adsorption tower |
| CN102343209B (en) * | 2011-09-28 | 2013-04-17 | 西安交通大学 | Seawater flue gas desulphurization (FGD) system applying boiler blowdown water |
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2013
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