CN102921287B - Double-tower double-circulation limestone wet method desulfurization device and method - Google Patents
Double-tower double-circulation limestone wet method desulfurization device and method Download PDFInfo
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- CN102921287B CN102921287B CN201210423242.2A CN201210423242A CN102921287B CN 102921287 B CN102921287 B CN 102921287B CN 201210423242 A CN201210423242 A CN 201210423242A CN 102921287 B CN102921287 B CN 102921287B
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Abstract
The invention discloses a double-tower double-circulation limestone wet-method desulfurization device and method. The double-tower double-circulation limestone wet-method desulfurization device comprises a smoke purification part, an absorbent supply part, a slurry oxidization and crystallization part and a gypsum slurry dehydration part, wherein the smoke purification part consists of a first-stage circulation absorption tower and a second-stage circulation absorption tower; the absorbent supply part consists of a gypsum slurry tank, a gypsum slurry pump and a slurry supply pipeline; the slurry oxidization and crystallization part consists of a oxidization fan, a first-stage circulation absorption tower oxidization spraying gun, a second-stage circulation absorption tower oxidization spraying gun and an oxidization air pipeline; and the gypsum slurry dehydration part consists of a first-stage circulation gypsum discharging pump, a gypsum whirlcone and a vacuum dehydration belt conveyer. The desulfurization device is extremely high in desulfurization efficiency, and the aims of reducing the sulfur dioxide and purifying air are fulfilled; and moreover, gypsum with extremely high quality can be obtained.
Description
Technical field
The present invention relates to Wet Limestone Desulfurization technical field, particularly a kind of Wet Limestone Desulfurization device and fume desulphurization method.
Background technology
At present, China is more and more stricter to the environmental requirement in thermal power plant, and fossil-fuel power plant atmospheric pollutant emission standard further improves, and the desulfurization emission reduction tasks that thermal power generation unit faces is severe all the more.According to national environmental protection portion " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011); the existing desulfurizer of most of thermal power plants all can not meet new emission request; need to carry out capacity-increasing transformation to existing desulfurization facility, improve desulfuration efficiency.
Existing Wet Limestone Desulfurization technology, is all to adopt single tower structure, and former flue gas directly enters in absorption tower and reacts.SO in flue gas
2after once removing, just, through demister, clean flue, smoke stack emission, reacted gypsum slurries directly enters the equipment such as cyclone, vacuum belt dewaterer and removes moisture, separates out gypsum crystal.SO in the method in flue gas
2only, through a spray washing, desulfuration efficiency is subject to certain restrictions, and is difficult to reach more than 97.5% efficiency.In addition, along with increasing of desulfuration efficiency, the pH value of slurries also can increase, and causes gypsum crystallization difficulty, and finished product gypsum moisture content is high, is difficult to reach qualified requirement, is unfavorable for comprehensive utilization.
Summary of the invention
The invention provides the two circulation Wet Limestone Desulfurization device and methods of a kind of double tower, solve that existing Wet Limestone Desulfurization technology cannot reach that very high desulfuration efficiency, gypsum moisture content is high, desulfurizer transformation idle time is long, technical problem to ature of coal bad adaptability.
For achieving the above object, the present invention adopts following technical scheme: the two circulation Wet Limestone Desulfurization devices of a kind of double tower, comprise gas cleaning part, absorbent supply section, slurries oxidizing and crystallizing part and gypsum slurries dehydration part, it is characterized in that: described gas cleaning part is made up of one-level circulating absorption tower and secondary circulating absorption tower, and the outlet of the one-level circulating flue gas at one-level circulating absorption tower top is communicated with the secondary circulating flue gas entrance at secondary circulating absorption tower middle part through transmitting flue, the secondary at the secondary circulating absorption tower top clean exhanst gas outlet that circulates is communicated with atmosphere by exit flue,
The inside hypomere of described one-level circulating absorption tower has one-level circulating absorption tower slurry pool, epimere has one-level circulating absorption tower spraying layer and one-level circulation demister, and one-level circulation demister is positioned at the top of one-level circulating absorption tower spraying layer, the one-level circulation circulation line that the shower of one-level circulating absorption tower spraying layer connects is outward connected with one-level circulating absorption tower slurry pool, on this one-level circulation circulation line, is connected with one-level circulation circulating pump.
The inside hypomere of described secondary circulating absorption tower has secondary circulating absorption tower slurry pool, epimere has secondary circulating absorption tower spraying layer and secondary circulation demister, and secondary circulation demister is positioned at the top of secondary circulating absorption tower spraying layer, the secondary circulation circulation line that the shower of secondary circulating absorption tower spraying layer connects is outward connected with secondary circulating absorption tower slurry pool, on this secondary circulation circulation line, is connected with secondary circulation circulating pump.
Described absorbent supply section is made up of lime stone slurry case, lime stone slurry supply pump and flow inlet road, and the discharging opening of lime stone slurry case is communicated with one-level circulating absorption tower slurry pool, secondary circulating absorption tower slurry pool by lime stone slurry supply pump and flow inlet road.
Described slurries oxidizing and crystallizing part is made up of oxidation fan, one-level circulating absorption tower oxidation spray gun, secondary circulating absorption tower oxidation spray gun and oxidation air pipeline, and oxidation fan is communicated with one-level circulating absorption tower slurry pool by oxidation air pipeline and one-level circulating absorption tower oxidation spray gun, oxidation fan is communicated with secondary circulating absorption tower slurry pool by oxidation air pipeline and secondary circulating absorption tower oxidation spray gun.
Described gypsum slurries dehydration part is made up of one-level circulation gypsum excavationg pump, gypsum cyclone and vacuum dehydration belt feeder, described one-level circulating absorption tower slurry pool is provided with gypsum slurries outlet, and gypsum slurries outlet is connected with the charging aperture of gypsum cyclone with pipeline by gypsum excavationg pump, and the discharging opening of gypsum cyclone is communicated with the charging aperture of vacuum dehydration belt feeder again.
Described secondary circulating absorption tower slurry pool is provided with gypsum slurries Returning outlet, and gypsum slurries Returning outlet returns to pump by secondary circulation gypsum slurries and pipeline is communicated with one-level circulating absorption tower slurry pool.
Described secondary circulating absorption tower slurry pool is provided with plaster serum rotational flow outlet, and plaster serum rotational flow outlet is communicated with the charging aperture of slurries circulation cyclone by secondary circulation plaster serum rotational flow pump and pipeline, and the discharging opening of slurries circulation cyclone is communicated with one-level circulating absorption tower slurry pool, secondary circulating absorption tower slurry pool by pipeline again.
In described one-level circulating absorption tower slurry pool, be provided with one-level circulating absorption tower agitator, in secondary circulating absorption tower slurry pool, be provided with secondary circulating absorption tower agitator.
A kind of two circulation Wet Limestone Desulfurization methods of double tower of having applied the two circulation Wet Limestone Desulfurization devices of double tower, it is characterized in that step is as follows: steps A, former flue gas enters one-level circulating absorption tower inside through the former smoke inlet at one-level circulating absorption tower middle part, flue gas flow rate is controlled at 3.0～3.5m/s, gypsum slurries in one-level circulating absorption tower stock tank is delivered in the shower on one-level circulating absorption tower spraying layer by one-level circulation circulating pump and one-level circulation circulation line, then former flue gas is washed and fallen in one-level circulating absorption tower stock tank, the pH value of the gypsum slurries in this one-level circulating absorption tower stock tank is controlled at 4.6～5.0, the control of slurries stay cycle is 5 minutes, CaCO
3dissolution time be controlled at more than 30 minutes, the crystallization time of gypsum is controlled at more than 12 hours.
Step B, flue gas after once washing upwards passes through the demist of one-level circulation demister, enter secondary circulating absorption tower inside through transmitting flue again, flue gas flow rate is controlled at 3.3～3.8m/s, gypsum slurries in secondary circulating absorption tower stock tank is delivered in the shower on secondary circulating absorption tower spraying layer by secondary circulation circulating pump and secondary circulation circulation line, then the flue gas after once washing carried out to secondary washing and fall in secondary circulating absorption tower stock tank, the pH value of the gypsum slurries in this secondary circulating absorption tower stock tank is controlled at 5.8～6.4, the control of slurries stay cycle is 4～5 minutes, CaCO
3dissolution time be controlled at more than 30 minutes, the crystallization time of gypsum is controlled at more than 12 hours.
Flue gas after step C, secondary washing upwards passes through the demist of secondary circulation demister, removes after large drop again by exit flue qualified discharge.
Gypsum slurries in step D, one-level circulating absorption tower stock tank is also delivered to gypsum cyclone by one-level circulation gypsum excavationg pump, and then eddy flow is delivered to the dehydration of vacuum dehydration belt feeder again after concentrating, and finally obtains the gypsum crystal that moisture content is less than 10%.
In carrying out steps A, step B, step C, gypsum slurries in secondary circulating absorption tower slurry pool also returns to pump by secondary circulation gypsum slurries and is delivered in one-level circulating absorption tower stock tank, controls the liquid level equilibrium of one-level circulating absorption tower stock tank and secondary circulating absorption tower slurry pool with this.
In carrying out steps A, step B, step C, gypsum slurries in secondary circulating absorption tower slurry pool is delivered to slurries circulation cyclone by secondary circulation plaster serum rotational flow pump, then eddy flow concentrated after through being delivered to respectively one-level circulating absorption tower stock tank, secondary circulating absorption tower slurry pool by pipeline, control the serum density balance of one-level circulating absorption tower stock tank and secondary circulating absorption tower slurry pool with this.
A preparation method for the two circulation Wet Limestone Desulfurization devices of double tower, is characterized in that step is as follows: step a, a newly-built circulating absorption tower with spraying layer and demister, make this circulating absorption tower as secondary circulating absorption tower; Step b, remove the exhanst gas outlet at top and being connected of exit flue of the circulating absorption tower in the Wet Limestone Desulfurization device of traditional single tower structure; Step c, the secondary circulating flue gas entrance at the exhanst gas outlet at the top of the circulating absorption tower in the Wet Limestone Desulfurization device of traditional single tower structure and secondary circulating absorption tower middle part is communicated with, the secondary at the secondary circulating absorption tower top clean exhanst gas outlet that circulates is communicated with exit flue, and now the circulating absorption tower in the Wet Limestone Desulfurization device of traditional single tower structure becomes one-level circulating absorption tower; Steps d, absorbent supply section, slurries oxidizing and crystallizing part and gypsum slurries dehydration part are set.
In described steps d, gypsum slurries Returning outlet is set, secondary circulation gypsum slurries returns to pump and pipeline, make gypsum slurries Returning outlet return to pump by secondary circulation gypsum slurries and pipeline is communicated with one-level circulating absorption tower slurry pool.
In described steps d, plaster serum rotational flow outlet, secondary circulation plaster serum rotational flow pump, slurries circulation cyclone and pipeline are set, plaster serum rotational flow outlet is communicated with the charging aperture of slurries circulation cyclone by secondary circulation plaster serum rotational flow pump and pipeline, and the discharging opening of slurries circulation cyclone is communicated with one-level circulating absorption tower slurry pool, secondary circulating absorption tower slurry pool by pipeline again.
Compared with prior art the present invention has following characteristics and beneficial effect: the present invention advanced person that possesses skills, and equipment is reliable, and the ratio of performance to price is high, and coal-fired sulfur is had to the features such as good adaptability.Its cardinal principle is the sulfur dioxide (SO utilizing in twice of lime stone (CaO) front and back and flue gas
2) reaction, be aided with oxidation air, by sulfur dioxide (SO simultaneously
2) catch and the final gypsum (CaSO that generates
4.2H
2o), the sulfur dioxide (SO of twice
2) clearance stack, thereby reach a very high desulfuration efficiency, realize the reduction of discharging of sulfur dioxide and the object purifying air.
Two circulating absorption towers in desulfurizer of the present invention are relatively independent, the control of the cyclic process in two circulating absorption towers is also independently, avoid the mutual restriction between parameter, can make course of reaction more optimize, can adapt to fast coal type change and load variations.
After having used the present invention, flue gas through pretreatment, has reduced the content of dirt, HCL, HF in one-level circulation, is conducive to secondary circulation and reaches high desulfurization efficiency.
Flue gas flow rate in one-level circulating absorption tower in the present invention is controlled at 3.0～3.5m/s, and the PH of the gypsum slurries in one-level circulating absorption tower slurry pool is controlled at 4.6～5.0, and the control of slurries stay cycle is 5 minutes, CaCO
3dissolution time be controlled at more than 30 minutes, the crystallization time of gypsum is controlled at more than 12 hours.The benefit of doing is like this, under sour environment, oxidation efficiency can be very high, can ensure excellent calcium sulfite oxidation effect and sufficient gypsum crystallization time, be conducive to the dissolving of lime stone and the crystallization of gypsum, can improve gypsum qualitt, improve gypsum dehydration rate, can obtain the gypsum that quality is very high; Meanwhile, under sour environment, oxidation air coefficient can reduce greatly, and oxidation air consumption can be reduced, so can significantly reduce the power consumption of oxidation fan.
Flue gas flow rate in secondary circulating absorption tower in the present invention is controlled at 3.3～3.8m/s, and the PH of the gypsum slurries in secondary circulating absorption tower stock tank 33 is controlled at 5.8～6.4, and the control of slurries stay cycle is 4～5 minutes, CaCO
3dissolution time be controlled at more than 30 minutes, the crystallization time of gypsum is controlled at more than 12 hours.The benefit of doing is like this that high pH value can ensure very high desulfuration efficiency, and can greatly reduce recycle slurry liquid measure, reduces circulating pump liquid-gas ratio, reduces energy consumption.
Sulfur method of the present invention is because adopted two-stage absorption tower, so the volume of dump stock tank is less than the volume of the dump stock tank in traditional Wet Limestone Desulfurization technology.
The independent control of each circulation of sulfur method of the present invention, is easy to optimize and rapid adjustment, can adapt to the significantly variation of sulfur content and load, and the adaptive capacity of traditional Wet Limestone Desulfurization technology is less.
Traditional Wet Limestone Desulfurization technology all adopts the desulfurization of single tower single cycle, has that absorption tower height is high, the capacious shortcoming of stock tank, is two-stage absorption tower and the present invention adopts, so their height is lower, stock tank volume is little, takes up room little.
Traditional Wet Limestone Desulfurization technology all adopts the desulfurization of single tower single cycle, only has a stock tank, so should obtain high-quality gypsum, obtain again high desulfurization efficiency, can make the control of plasm PH value become a contradiction, be difficult to reach balance, therefore generally can only meet a requirement, and sulfur method of the present invention can obtain high-quality gypsum, can obtain again high desulfurization efficiency.
Traditional Wet Limestone Desulfurization technology all adopts the desulfurization of single tower single cycle, and the desulfurization of single tower single cycle can only be selected single anticorrosion material, and every tower in sulfur method of the present invention can be selected different suitable anticorrosion materials according to different PH.
The present invention is a kind of novel Wet Limestone Desulfurization technology, can on the basis of the Wet Limestone Desulfurization device of traditional single tower structure, form by capacity-increasing transformation, its advantage have following some.1, in capacity-increasing transformation process, can make full use of the relevant device of original desulfurizer, avoid tearing open the least favorable situation that tower weight is built.2, in capacity-increasing transformation process, in the situation that not changing desulfurizing agent, can effectively improve desulfuration efficiency, strengthen contacting of transformation newly added equipment and existing equipment, improve the reliability of whole desulphurization system, reduce cost.3, in capacity-increasing transformation process, normal influence on system operation to existing desulfurizer is less, the idle time of existing desulfurizer is shorter, and after transformation, desulphurization system can be moved continually and steadily, and the start and stop of desulphurization system and normal operation all do not affect the safe operation of unit and carrying out production strictly in line with rules and regulations of power plant.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Fig. 1 is structural representation of the present invention.
Reference numeral: 1-one-level circulating absorption tower, 2-secondary circulating absorption tower, 3-one-level circulation circulating pump, 4-secondary circulation circulating pump, 5-one-level circulating absorption tower spraying layer, 6-secondary circulating absorption tower spraying layer, 7-one-level circulation demister, 8-secondary circulation demister, 9-one-level circulating absorption tower agitator, 10-secondary circulating absorption tower agitator, 11-one-level circulating absorption tower oxidation spray gun, 12-secondary circulating absorption tower oxidation spray gun, 13-one-level circulation gypsum excavationg pump, 14-gypsum cyclone, 15-vacuum dehydration belt feeder, 16-oxidation fan, 17-lime stone slurry case, 18-lime stone slurry supply pump, 19-limestone slurry box stirrer, 20-secondary circulation gypsum slurries returns to pump, 21-secondary circulation plaster serum rotational flow pump, 22-slurries circulation cyclone, 23-one-level circulation circulation line, 24-secondary circulation circulation line, the former smoke inlet of 25-, the outlet of 26-one-level circulating flue gas, 27-secondary circulating flue gas entrance, the 28-secondary clean exhanst gas outlet that circulates, 29-transmits flue, 30-oxidation air pipeline, 31-lime stone slurry pipeline, 32-one-level circulating absorption tower slurry pool, 33-secondary circulating absorption tower slurry pool, 34-exit flue.
Detailed description of the invention
Embodiment is shown in Figure 1, and the two circulation Wet Limestone Desulfurization devices of this double tower comprise gas cleaning part, absorbent supply section, slurries oxidizing and crystallizing part and gypsum slurries dehydration part.
Described gas cleaning part is made up of one-level circulating absorption tower 1 and secondary circulating absorption tower 2, and the one-level circulating flue gas at one-level circulating absorption tower 1 top outlet 26 is communicated with the secondary circulating flue gas entrance 27 at secondary circulating absorption tower 2 middle parts through transmitting flue 29, the secondary at the secondary circulating absorption tower 2 tops clean exhanst gas outlet 28 that circulates passes through exit flue 34 and is communicated with atmosphere.
The inside hypomere of described one-level circulating absorption tower 1 has one-level circulating absorption tower slurry pool 32, epimere has one-level circulating absorption tower spraying layer 5 and one-level circulation demister 7, and one-level circulation demister 7 is positioned at the top of one-level circulating absorption tower spraying layer 5, the one-level circulation circulation line 23 that the shower of one-level circulating absorption tower spraying layer 5 connects is outward connected with one-level circulating absorption tower slurry pool 32, on this one-level circulation circulation line 23, is connected with one-level circulation circulating pump 3.
The inside hypomere of described secondary circulating absorption tower 2 has secondary circulating absorption tower slurry pool 33, epimere has secondary circulating absorption tower spraying layer 6 and secondary circulation demister 8, and secondary circulation demister 8 is positioned at the top of secondary circulating absorption tower spraying layer 6, the secondary circulation circulation line 24 that the shower of secondary circulating absorption tower spraying layer 6 connects is outward connected with secondary circulating absorption tower slurry pool 33, on this secondary circulation circulation line 24, is connected with secondary circulation circulating pump 4.
Described absorbent supply section is made up of lime stone slurry case 17, lime stone slurry supply pump 18 and flow inlet road 31, and the discharging opening of lime stone slurry case 17 is communicated with one-level circulating absorption tower slurry pool 32, secondary circulating absorption tower slurry pool 33 by lime stone slurry supply pump 18 and flow inlet road 31.
Described slurries oxidizing and crystallizing part is made up of oxidation fan 16, one-level circulating absorption tower oxidation spray gun 11, secondary circulating absorption tower oxidation spray gun 12 and oxidation air pipeline 30, and oxidation fan 16 is communicated with one-level circulating absorption tower slurry pool 32 by oxidation air pipeline 30 and one-level circulating absorption tower oxidation spray gun 11, oxidation fan 16 is communicated with secondary circulating absorption tower slurry pool 33 by oxidation air pipeline 30 and secondary circulating absorption tower oxidation spray gun 12.That is to say, oxidation fan 16 passes into respectively the inside of one-level circulating absorption tower slurry pool 32 and the inside of secondary circulating absorption tower slurry pool 33 via oxidation air pipeline 30 and by one-level circulating absorption tower oxidation spray gun 11 and secondary circulating absorption tower oxidation spray gun 12 by air.
Described gypsum slurries dehydration part is made up of one-level circulation gypsum excavationg pump 13, gypsum cyclone 14 and vacuum dehydration belt feeder 15; Described one-level circulating absorption tower slurry pool 32 is provided with gypsum slurries outlet, and gypsum slurries outlet is connected with the charging aperture of gypsum cyclone 14 with pipeline by gypsum excavationg pump 13, and the discharging opening of gypsum cyclone 14 is communicated with the charging aperture of vacuum dehydration belt feeder 15 again.
Described secondary circulating absorption tower slurry pool 33 is provided with gypsum slurries Returning outlet, and gypsum slurries Returning outlet returns to pump 20 by secondary circulation gypsum slurries and pipeline is communicated with one-level circulating absorption tower slurry pool 32.It is to control the liquid level equilibrium of one-level circulating absorption tower stock tank 32 and secondary circulating absorption tower slurry pool 33 that the object that gypsum slurries Returning outlet and secondary circulation gypsum slurries return to pump 20 is set.
Described secondary circulating absorption tower slurry pool 33 is provided with plaster serum rotational flow outlet, and plaster serum rotational flow outlet is communicated with the charging aperture of slurries circulation cyclone 22 by secondary circulation plaster serum rotational flow pump 21 and pipeline, and the discharging opening of slurries circulation cyclone 22 is communicated with one-level circulating absorption tower slurry pool 32, secondary circulating absorption tower slurry pool 33 by pipeline again.The object that plaster serum rotational flow outlet, secondary circulation plaster serum rotational flow pump 21 and slurries circulation cyclone 22 are set is to control the serum density balance of one-level circulating absorption tower stock tank 32 and secondary circulating absorption tower slurry pool 33.
In described one-level circulating absorption tower slurry pool 32, be provided with one-level circulating absorption tower agitator 9, in secondary circulating absorption tower slurry pool 33, be provided with secondary circulating absorption tower agitator 10.
This two circulation Wet Limestone Desulfurization methods of double tower of having applied the two circulation Wet Limestone Desulfurization devices of above-mentioned double tower, its step is as follows.
Steps A, former flue gas enters one-level circulating absorption tower 1 inside through the former smoke inlet 25 at one-level circulating absorption tower 1 middle part, flue gas flow rate is controlled at 3.0～3.5m/s, gypsum slurries in one-level circulating absorption tower stock tank 32 is delivered in the shower on one-level circulating absorption tower spraying layer 5 by one-level circulation circulating pump 3 and one-level circulation circulation line 23, then former flue gas is washed and fallen in one-level circulating absorption tower stock tank 32, the pH value of the gypsum slurries in this one-level circulating absorption tower stock tank 32 is controlled at 4.6～5.0, the control of slurries stay cycle is 5 minutes, CaCO
3dissolution time be controlled at more than 30 minutes, the crystallization time of gypsum is controlled at more than 12 hours, this process can remove in former flue gas 30%～80% SO
2.
Step B, flue gas after once washing upwards passes through 7 demists of one-level circulation demister, enter secondary circulating absorption tower 2 inside through transmitting flue 29 again, flue gas flow rate is controlled at 3.3～3.8m/s, gypsum slurries in secondary circulating absorption tower stock tank 33 is delivered in the shower on secondary circulating absorption tower spraying layer 6 by secondary circulation circulating pump 4 and secondary circulation circulation line 24, then the flue gas after once washing carried out to secondary washing and fall in secondary circulating absorption tower stock tank 33, the pH value of the gypsum slurries in this secondary circulating absorption tower stock tank 33 is controlled at 5.8～6.4, the control of slurries stay cycle is 4～5 minutes, CaCO
3dissolution time be controlled at more than 30 minutes, the crystallization time of gypsum is controlled at more than 12 hours, this process can remove and in flue gas, remain SO
290%-97%.
Flue gas after step C, secondary washing upwards passes through 8 demists of secondary circulation demister, removes after large drop again by exit flue 34 qualified discharges.
Gypsum slurries in step D, one-level circulating absorption tower stock tank 32 is also delivered to gypsum cyclone 14 by one-level circulation gypsum excavationg pump 13, then eddy flow is delivered to vacuum dehydration belt feeder 15 after concentrated again and dewaters, and does like this and can finally obtain the gypsum crystal that moisture content is less than 10%.
In carrying out steps A, step B, step C, gypsum slurries in secondary circulating absorption tower slurry pool 33 also returns to pump 20 by secondary circulation gypsum slurries and is delivered in one-level circulating absorption tower stock tank 32, and the object of doing is like this to control the liquid level equilibrium of one-level circulating absorption tower stock tank 32 and secondary circulating absorption tower slurry pool 33.
In carrying out steps A, step B, step C, gypsum slurries in secondary circulating absorption tower slurry pool 33 is delivered to slurries circulation cyclone 22 by secondary circulation plaster serum rotational flow pump 21, then eddy flow concentrated after through being delivered to respectively one-level circulating absorption tower stock tank 32, secondary circulating absorption tower slurry pool 33 by pipeline, the object of doing is like this to control the serum density balance of one-level circulating absorption tower stock tank 32 and secondary circulating absorption tower slurry pool 33.
Taking certain test as example: the present invention is applied to the flue gas desulfurization test of 2*300MW unit, wherein one-level circulating absorption tower or secondary circulating absorption tower can utilize the front original slurries circulating absorption tower of transformation, every a set of desulfurizer of stove, transformation idle time is less than one month, and main operational factor is as follows: 1. SO in former flue gas
2mass concentration is 10947mg/ Nm
3(mark dry state, 6%O
2), clean flue gas SO
2mass concentration is 142.3mg/m
3(mark dry state, 6%O
2), desulfuration efficiency is 98.7%; 2. former flue-gas temperature is 132 DEG C, and clean flue-gas temperature is 53.2 DEG C; 3. finished product gypsum moisture content is 7.52%.From test run effect, the two circulation Wet Limestone Desulfurization methods of double tower of the present invention can reach very high desulfuration efficiency.Compare existing fume desulphurization method, obtain that the power consumption that same desulfuration efficiency consumes is low, the quality of gypsum wants high.
The preparation method (being a kind of method that Wet Limestone Desulfurization plant modification by traditional single tower structure becomes the two circulation Wet Limestone Desulfurization devices of double tower) of the two circulation Wet Limestone Desulfurization devices of above-mentioned double tower, its step is as follows.
Step a, a newly-built circulating absorption tower with spraying layer and demister, make this circulating absorption tower as secondary circulating absorption tower 2.
Step b, remove the exhanst gas outlet at top and being connected of exit flue of the circulating absorption tower in the Wet Limestone Desulfurization device of traditional single tower structure.
Step c, the exhanst gas outlet at the top of the circulating absorption tower in the Wet Limestone Desulfurization device of traditional single tower structure is communicated with the secondary circulating flue gas entrance 27 at secondary circulating absorption tower 2 middle parts, the secondary at the secondary circulating absorption tower 2 tops clean exhanst gas outlet that circulates is communicated with exit flue 34, and now the circulating absorption tower in the Wet Limestone Desulfurization device of traditional single tower structure becomes one-level circulating absorption tower 1.
Steps d, absorbent supply section, slurries oxidizing and crystallizing part and gypsum slurries dehydration part are set.Gypsum slurries Returning outlet is set simultaneously, secondary circulation gypsum slurries returns to pump 20 and pipeline, makes gypsum slurries Returning outlet return to pump 20 by secondary circulation gypsum slurries and pipeline is communicated with one-level circulating absorption tower slurry pool 32.Plaster serum rotational flow outlet, secondary circulation plaster serum rotational flow pump 21, slurries circulation cyclone 22 and pipeline are also set simultaneously, plaster serum rotational flow outlet is communicated with the charging aperture of slurries circulation cyclone 22 by secondary circulation plaster serum rotational flow pump 21 and pipeline, and the discharging opening of slurries circulation cyclone 22 is communicated with one-level circulating absorption tower slurry pool 32, secondary circulating absorption tower slurry pool 33 by pipeline again.
Claims (6)
1. the two circulation Wet Limestone Desulfurization methods of double tower of the two circulation Wet Limestone Desulfurization devices of double tower have been applied for one kind, the two circulation Wet Limestone Desulfurization devices of described double tower comprise gas cleaning part, absorbent supply section, slurries oxidizing and crystallizing part and gypsum slurries dehydration part, described gas cleaning part is made up of one-level circulating absorption tower (1) and secondary circulating absorption tower (2), and the one-level circulating flue gas at one-level circulating absorption tower (1) top outlet (26) is communicated with the secondary circulating flue gas entrance (27) at secondary circulating absorption tower (2) middle part through transmitting flue (29), the secondary at secondary circulating absorption tower (2) the top clean exhanst gas outlet (28) that circulates is communicated with atmosphere by exit flue (34), the inside hypomere of described one-level circulating absorption tower (1) has one-level circulating absorption tower slurry pool (32), epimere has one-level circulating absorption tower spraying layer (5) and one-level circulation demister (7), and one-level circulation demister (7) is positioned at the top of one-level circulating absorption tower spraying layer (5), the one-level circulation circulation line (23) that the shower of one-level circulating absorption tower spraying layer (5) connects is outward connected with one-level circulating absorption tower slurry pool (32), on this one-level circulation circulation line (23), is connected with one-level circulation circulating pump (3), the inside hypomere of described secondary circulating absorption tower (2) has secondary circulating absorption tower slurry pool (33), epimere has secondary circulating absorption tower spraying layer (6) and secondary circulation demister (8), and secondary circulation demister (8) is positioned at the top of secondary circulating absorption tower spraying layer (6), the secondary circulation circulation line (24) that the shower of secondary circulating absorption tower spraying layer (6) connects is outward connected with secondary circulating absorption tower slurry pool (33), on this secondary circulation circulation line (24), is connected with secondary circulation circulating pump (4), described absorbent supply section is by lime stone slurry case (17), lime stone slurry supply pump (18) and flow inlet road (31) formation, and the discharging opening of lime stone slurry case (17) is communicated with one-level circulating absorption tower slurry pool (32), secondary circulating absorption tower slurry pool (33) by lime stone slurry supply pump (18) and flow inlet road (31), described slurries oxidizing and crystallizing part is made up of oxidation fan (16), one-level circulating absorption tower oxidation spray gun (11), secondary circulating absorption tower oxidation spray gun (12) and oxidation air pipeline (30), and oxidation fan (16) is communicated with one-level circulating absorption tower slurry pool (32) by oxidation air pipeline (30) and one-level circulating absorption tower oxidation spray gun (11), oxidation fan (16) is communicated with secondary circulating absorption tower slurry pool (33) by oxidation air pipeline (30) and secondary circulating absorption tower oxidation spray gun (12), described gypsum slurries dehydration part is made up of one-level circulation gypsum excavationg pump (13), gypsum cyclone (14) and vacuum dehydration belt feeder (15), described one-level circulating absorption tower slurry pool (32) is provided with gypsum slurries outlet, and gypsum slurries outlet is connected with the charging aperture of gypsum cyclone (14) with pipeline by gypsum excavationg pump (13), the discharging opening of gypsum cyclone (14) is communicated with the charging aperture of vacuum dehydration belt feeder (15) again, it is characterized in that step is as follows:
Steps A, former flue gas enters one-level circulating absorption tower (1) inside through the former smoke inlet (25) at one-level circulating absorption tower middle part, flue gas flow rate is controlled at 3.0～3.5m/s, gypsum slurries in one-level circulating absorption tower slurry pool (32) is delivered in the shower on one-level circulating absorption tower spraying layer (5) by circulate circulating pump (3) and one-level circulation circulation line (23) of one-level, then former flue gas is washed and fallen in one-level circulating absorption tower slurry pool (32), the pH value of the gypsum slurries in this one-level circulating absorption tower slurry pool (32) is controlled at 4.6～5.0, the control of slurries stay cycle is 5 minutes, CaCO
3dissolution time be controlled at more than 30 minutes, the crystallization time of gypsum is controlled at more than 12 hours,
Step B, flue gas after once washing upwards passes through one-level circulation demister (7) demist, enter secondary circulating absorption tower (2) inside through transmitting flue (29) again, flue gas flow rate is controlled at 3.3～3.8m/s, gypsum slurries in secondary circulating absorption tower slurry pool (33) is delivered in the shower on secondary circulating absorption tower spraying layer (6) by circulate circulating pump (4) and secondary circulation circulation line (24) of secondary, then the flue gas after once washing carried out to secondary washing and fall in secondary circulating absorption tower slurry pool (33), the pH value of the gypsum slurries in this secondary circulating absorption tower slurry pool (33) is controlled at 5.8～6.4, the control of slurries stay cycle is 4～5 minutes, CaCO
3dissolution time be controlled at more than 30 minutes, the crystallization time of gypsum is controlled at more than 12 hours,
Flue gas after step C, secondary washing upwards passes through secondary circulation demister (8) demist, removes after large drop again by exit flue (34) qualified discharge;
Gypsum slurries in step D, one-level circulating absorption tower slurry pool (32) is delivered to gypsum cyclone (14) by one-level circulation gypsum excavationg pump (13), then eddy flow is delivered to vacuum dehydration belt feeder (15) dehydration again after concentrating, and finally obtains the gypsum crystal that moisture content is less than 10%.
2. the two circulation Wet Limestone Desulfurization methods of double tower of having applied the two circulation Wet Limestone Desulfurization devices of double tower according to claim 1, it is characterized in that: described secondary circulating absorption tower slurry pool (33) is provided with gypsum slurries Returning outlet, and gypsum slurries Returning outlet returns to pump (20) by secondary circulation gypsum slurries and pipeline is communicated with one-level circulating absorption tower slurry pool (32).
3. the two circulation Wet Limestone Desulfurization methods of double tower of having applied the two circulation Wet Limestone Desulfurization devices of double tower according to claim 1, it is characterized in that: described secondary circulating absorption tower slurry pool (33) is provided with plaster serum rotational flow outlet, and plaster serum rotational flow outlet is communicated with the charging aperture of slurries circulation cyclone (22) by secondary circulation plaster serum rotational flow pump (21) and pipeline, and the discharging opening of slurries circulation cyclone (22) is communicated with one-level circulating absorption tower slurry pool (32), secondary circulating absorption tower slurry pool (33) by pipeline again.
4. the two circulation Wet Limestone Desulfurization methods of double tower of having applied the two circulation Wet Limestone Desulfurization devices of double tower according to claim 1, it is characterized in that: in described one-level circulating absorption tower slurry pool (32), be provided with one-level circulating absorption tower agitator (9), in secondary circulating absorption tower slurry pool (33), be provided with secondary circulating absorption tower agitator (10).
5. the two circulation Wet Limestone Desulfurization methods of double tower of having applied the two circulation Wet Limestone Desulfurization devices of double tower according to claim 1, it is characterized in that: in carrying out steps A, step B, step C, gypsum slurries in secondary circulating absorption tower slurry pool (33) also returns to pump (20) by secondary circulation gypsum slurries and is delivered in one-level circulating absorption tower slurry pool (32), controls the liquid level equilibrium of one-level circulating absorption tower slurry pool (32) and secondary circulating absorption tower slurry pool (33) with this.
6. the two circulation Wet Limestone Desulfurization methods of double tower of having applied the two circulation Wet Limestone Desulfurization devices of double tower according to claim 1, it is characterized in that: carrying out steps A, step B, when step C, gypsum slurries in secondary circulating absorption tower slurry pool (33) is delivered to slurries circulation cyclone (22) by secondary circulation plaster serum rotational flow pump (21), then eddy flow concentrated after through being delivered to respectively one-level circulating absorption tower slurry pool (32) by pipeline, secondary circulating absorption tower slurry pool (33), control the serum density balance of one-level circulating absorption tower slurry pool (32) and secondary circulating absorption tower slurry pool (33) with this.
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