CN204582943U - Flue gas desulphurization system - Google Patents
Flue gas desulphurization system Download PDFInfo
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- CN204582943U CN204582943U CN201520161423.1U CN201520161423U CN204582943U CN 204582943 U CN204582943 U CN 204582943U CN 201520161423 U CN201520161423 U CN 201520161423U CN 204582943 U CN204582943 U CN 204582943U
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Abstract
The utility model discloses a kind of flue gas desulphurization system, it comprises pre-desulfurizing tower and main desulfurizing tower, the mouth that enters of described pre-desulfurizing tower is connected with the exhanst gas outlet of smelting furnace, the outlet flue of pre-desulfurizing tower is connected with the air inlet of main desulfurizing tower, the liquid outlet place of pre-desulfurizing tower and/or the desulfurizing agent import department of main desulfurizing tower are provided with metrological service, described metrological service comprises control unit and pH value detecting unit, pH value signal is also delivered to control unit by the liquid pH value in pH value detecting unit signal piping, control unit receives pH value signal and control and regulation input the desulfurizing agent flow in pre-desulfurizing tower and/or main desulfurizing tower.The method of fractional steps is adopted to process sulfur-containing smoke gas, effectively can ensure that the flue gas after processing reaches discharge standard like this, in addition, by tracer liquid pH value to control to adjust the desulfurizing agent flow in the pre-desulfurizing tower of input and/or main desulfurizing tower in advance, so not only can guarantee that sulfur-containing smoke gas is effectively addressed, and the utilization rate of desulfurizing agent can be improved.
Description
Technical field
The utility model relates to chemical production field, is specifically related to a kind of flue gas desulphurization system.
Background technology
In the process of pyrometallurgical smelting copper, for the sulfur-containing smoke gas of discharging in smelting furnace, copper mine corporate boss domestic at present will adopt the methods such as ionic liquid method, magnesium oxide method, ammonia process, gypsum, sodium method to process, and reaches SO to make flue gas
2discharge standard.But in actual production process, because the exhaust gas volumn fluctuation produced in melting/converting furnace is large, and the SO in flue gas
2concentration is high, these high concentration SO
2the low concentration SO produced in the smelting furnace such as flue gas and anode furnace
2when the desulfurizing tower entering desulphurization system after flue gas mixing carries out desulfurization, once the exhaust gas volumn in melting/converting furnace increases instantaneously, SO in flue gas
2when concentration becomes large, desulfurizing tower cannot adapt to the high load capacity flue gas change occurred instantaneously, cause the tail row SO of system
2concentration over-standard.In order to solve the problem of pending flue gas fluctuation, desulfurizing tower and auxiliary facility thereof need design by the peak value of smoke treatment by copper mine enterprise, cause the input cost of the raw material such as equipment investment cost and desulfurizing agent very high.In addition, during for magnesium oxide method smoke treatment, because system loading fluctuation is large, when the unexpected step-down of load, because Systematical control is delayed, desulfurizing agent can be caused to contain magnesian slurries and all cannot be converted into magnesium sulfite, and then cause the loss of desulfurizing agent.Therefore, how to reduce fume treatment cost, this is concerning extremely important copper mine enterprise.
Summary of the invention
The purpose of this utility model is to provide the flue gas desulphurization system that a kind of cost of investment is low, desulfurized effect is good.
For achieving the above object, the technical solution adopted in the utility model is: a kind of flue gas desulphurization system, it is characterized in that: comprise pre-desulfurizing tower and main desulfurizing tower, the mouth that enters of described pre-desulfurizing tower is connected with the exhanst gas outlet of smelting furnace, the outlet flue of pre-desulfurizing tower is connected with the air inlet of main desulfurizing tower, the liquid outlet place of pre-desulfurizing tower and/or the desulfurizing agent import department of main desulfurizing tower are provided with metrological service, described metrological service comprises control unit and pH value detecting unit, pH value signal is also delivered to control unit by the liquid pH value in pH value detecting unit signal piping, control unit receives pH value signal and control and regulation input the desulfurizing agent flow in pre-desulfurizing tower and/or main desulfurizing tower.
The beneficial effect adopting technique scheme to produce is: adopt the method for fractional steps to process sulfur-containing smoke gas, effectively can ensure that the flue gas after processing reaches discharge standard like this, concrete, pre-desulfurizing tower is first adopted to carry out pre-desulfurization to the sulfur-containing smoke gas of discharging in smelting furnace, and then the sulfur-containing smoke gas after pre-desulfurization is carried out secondary desulfuration by main desulfurizing tower, thus effectively improve flue gas desulfurization effect, and in addition, the SO in the sulfur-containing smoke gas in smelting furnace
2during content fluctuation, the liquid pH value of discharging in pre-desulfurizing tower can be caused to change, simultaneously in order to ensure the desulfurized effect of main desulfurizing tower, therefore by the liquid pH value in signal piping with control to adjust in advance input pre-desulfurizing tower and/or main desulfurizing tower in desulfurizing agent flow, so not only can guarantee that sulfur-containing smoke gas obtains effective desulfurization process, and the utilization rate of desulfurizing agent can be improved, and then reduce fume treatment cost.Concrete, disclosed in the utility model, desulphurization system is applicable to wet desulphurization, and as magnesium oxide method, limestone-gypsum method, sodium method and the ammonia process of desulfurization, it is applied widely.
Accompanying drawing explanation
Fig. 1,2 is structure charts of two kinds of embodiments of desulphurization system of the present utility model.
Detailed description of the invention
A kind of flue gas desulphurization system, it comprises pre-desulfurizing tower 10 and main desulfurizing tower 20, the mouth 11 that enters of described pre-desulfurizing tower 10 is connected with the exhanst gas outlet of smelting furnace, the outlet flue 12 of pre-desulfurizing tower 10 is connected with the air inlet 21 of main desulfurizing tower 20, liquid outlet 13 place of pre-desulfurizing tower 10 and/or desulfurizing agent import 22 place of main desulfurizing tower 20 are provided with metrological service 30, described metrological service 30 comprises control unit and pH value detecting unit, pH value signal is also delivered to control unit by the liquid pH value in pH value detecting unit signal piping, control unit receives pH value signal and control and regulation input the desulfurizing agent flow in pre-desulfurizing tower 10 and/or main desulfurizing tower 20.As shown in Figure 1, 2, the utility model adopts the method for fractional steps to process sulfur-containing smoke gas, effectively can ensure that the flue gas after processing reaches discharge standard like this, concrete, first adopt the sulfur-containing smoke gas of discharging in pre-desulfurizing tower 10 pairs of smelting furnaces to carry out pre-desulfurization, and then the sulfur-containing smoke gas after pre-desulfurization is carried out secondary desulfuration by main desulfurizing tower 20, thus effectively improve desulfurized effect, in addition, as the SO in the sulfur-containing smoke gas in smelting furnace
2during content fluctuation, can cause surveying the liquid pH value of discharging in pre-desulfurizing tower 10 to change, simultaneously in order to ensure the desulfurized effect of main desulfurizing tower 20, therefore by the liquid pH value in signal piping with control to adjust in advance input pre-desulfurizing tower 10 and/or main desulfurizing tower 20 in desulfurizing agent flow, so effectively can improve the utilization rate of desulfurizing agent, and then reduce fume treatment cost.During actual use, regulate the desulfurizing agent flow in the pre-desulfurizing tower 10 of input by metrological service 30, so not only can ensure effective utilization of desulfurizing agent, the SO in the sulfur-containing smoke gas after pre-desulfurization can also be guaranteed
2relative concentration is stablized, and then makes winner's desulfurizing tower 20 effectively sulfur-containing smoke gas be carried out desulfurization process and to reach outer row's standard.Certainly, actual in using, also can only by tolerance and SO
2the flue gas that fluctuation of concentration is large passes in pre-desulfurizing tower 10 and carries out pretreatment, with by the SO in flue gas
2concentration drops to certain value, and then passes into main desulfurizing tower 20 in the lump after mixing with the flue gas that other low concentration stablizes tolerance, and the flue gas concentration entered like this in main desulfurizing tower is stablized, thus ensure that the desulfuration efficiency of main desulfurizing tower 20.Desulphurization system disclosed in the utility model adopts combined type desulfurization, is passed in pre-desulfurizing tower 10 by desulfurizing agent excessive in main desulfurizing tower 20 again and carries out fume treatment, effective like this waste avoiding desulfurizing agent.
As further preferred version: described pre-desulfurizing tower 10 is provided with richness, poor desulfurizing agent import 14,15, described rich desulfurizing agent import 14 is connected with the outlet 41 of desulfurizing agent storage tank 40, and poor desulfurizing agent import 15 exports 23 with the first liquid of main desulfurizing tower 20 and is connected.As shown in Figure 1, also containing a certain amount of desulfurizing agent in the liquid produced after desulfurization in main desulfurizing tower 20, therefore, while desulfurizing agent storage tank 40 carries desulfurizing agent in pre-desulfurizing tower 10, the liquid in main desulfurizing tower 20 is also delivered in pre-desulfurizing tower 10, the utilization rate of desulfurizing agent can be improved like this.Moreover, when employing contains magnesian slurries as desulfurizing agent, all containing magnesium sulfite and magnesium bisulfite in the liquid produced after desulfurization in main desulfurizing tower 20 and pre-desulfurizing tower 10, therefore the sweetening liq in main desulfurizing tower 20 is delivered to after discharging again in pre-desulfurizing tower 10, focusing on of liquid can be facilitated, to reduce the equipment investment cost of collecting process accessory substance.
Actual in employing limestone-gypsum method, when sodium method and ammonia process carry out desulfurization to flue gas, can directly adopt the desulphurization system shown in Fig. 2, the liquid of namely discharging from the liquid outlet 13 of pre-desulfurizing tower 10 directly passes into solid-liquid separator 70 and carries out processing, and when desulfurization being carried out to flue gas for magnesium oxide method, consider from the liquid that the liquid outlet 13 of pre-desulfurizing tower 10 is discharged containing recycling magnesium sulfite and magnesium bisulfite, therefore preferred, as shown in Figure 1, described flue gas desulphurization system also comprises regenerated liquid blending tank 50, regenerated liquid retort 60 and solid-liquid separator 70, the inlet of regenerated liquid blending tank 50 is connected with the liquid outlet 13 of the outlet 41 of desulfurizing agent storage tank 40 and pre-desulfurizing tower 10, the tap hole of regenerated liquid blending tank 50 is connected with the inlet of regenerated liquid retort 60, the inlet of solid-liquid separator 70, liquid outlet respectively with the liquid outlet of regenerated liquid retort 60, the desulfurizing agent import 22 of main desulfurizing tower 20 is connected, the metrological service 30 ' that desulfurizing agent import 22 place of main desulfurizing tower 20 is arranged detects the liquid pH value in the pipeline between the liquid outlet of regenerated liquid retort 60 and the desulfurizing agent import 22 of main desulfurizing tower 20 and controls to adjust the desulfurizing agent flow inputted from the outlet 41 of desulfurizing agent storage tank 40 pre-desulfurizing tower 10 and main desulfurizing tower 20.As shown in Figure 1, reality in use, when to adopt containing magnesian slurries and magnesium hydroxide solution as desulfurizing agent, the liquid so entered in regenerated liquid blending tank 50 from the liquid outlet 13 of pre-desulfurizing tower 10 mainly contains magnesium sulfite and magnesium bisulfite, therefore adopt desulfurizing agent storage tank 40 to pass into desulfurizing agent in regenerated liquid blending tank 50 to mix, magnesium bisulfite time in such mixed liquor input regenerated liquid retort 60 in mixed liquor and magnesium hydroxide can react generation magnesium sulfite, when magnesium sulfite unsaturation in solution, its supernatant liquor left standstill in solid-liquid separator 70 after a period of time wherein can directly be delivered in main desulfurizing tower 20 as desulfurizing agent to absorb the SO in flue gas
2and precipitation will be separated out in solid-liquid separator 70 when the magnesium sulfite in pipeline is saturated, to discharge a part of magnesium sulfite, and then guarantee flue gas desulfurization continue carry out, technique scheme is adopted to not only simplify pipe arrangement, and effectively improve the conversion ratio of solid slag magnesium sulfite or magnesium sulfate, and then reduce the slag content in desulfurizing agent.
Reality in use, in order to improve the utilization rate of desulfurizing agent further, as shown in Figure 1, the side of described main desulfurizing tower 20 is provided with delivery pump 80, the entrance point of delivery pump 80 exports 24 with the second liquid that the liquid outlet of solid-liquid separator 70 and main desulfurizing tower 20 are arranged and is connected, the port of export of delivery pump 80 is connected with the desulfurizing agent import 22 of main desulfurizing tower 20, in addition, the pipeline of the first liquid outlet 23 of main desulfurizing tower 20 and the poor desulfurizing agent import 15 of pre-desulfurizing tower 10 is provided with liquid pump 90 and stop valve 100, sweetening liq in main desulfurizing tower 20 can be recycled by the layout of delivery pump 80, to improve the utilization ratio of desulfurizing agent, certainly, also directly can open stop valve 100 sweetening liq in main desulfurizing tower 20 is delivered in pre-desulfurizing tower 10 carries out doing desulfurization again and use and focus on, to improve the utilization ratio of desulfurizing agent.That is, desulphurization system disclosed in the utility model is adopted effectively can to recycle the liquid after absorption flue gas in main desulfurizing tower 20, to reduce flue gas desulfurization cost.
Further, outlet 41 place of described desulfurizing agent storage tank 40 is provided with the pump 130 desulfurizing agent in desulfurizing agent storage tank 40 being delivered to pre-desulfurizing tower 10 and regenerated liquid blending tank 50, the pipeline of the rich desulfurizing agent import 14 of the pre-desulfurizing tower of outlet 10 of described pump 130 and the inlet of regenerated liquid blending tank 50 is respectively arranged with first, second control valve 110, 120, the metrological service 30 ' that the metrological service 30 of liquid outlet 13 place setting of pre-desulfurizing tower 10 and desulfurizing agent import 22 place of main desulfurizing tower 20 are arranged is by control first, second control valve 110, the aperture of 120 is to regulate the desulfurizing agent flow be delivered in pre-desulfurizing tower 10 and main desulfurizing tower 20.Like this when reality uses, the SO in the sulfur-containing smoke gas of discharging in smelting furnace
2when concentration becomes large suddenly, the concentration of the magnesium bisulfite the sweetening liq of discharging in pre-desulfurizing tower 10 will rise, cause sweetening liq pH value on a declining curve, the metrological service 30 that now liquid outlet 13 place of pre-desulfurizing tower 10 is arranged just can control raising first, second control valve 110, the aperture of 120 is to increase the desulfurizing agent flow be delivered in pre-desulfurizing tower 10 and main desulfurizing tower 20, and then ensure that flue gas is able to effective desulfurization, meanwhile, also the liquid pH value in the pipeline of the liquid outlet of solid-liquid separator 70 and the desulfurizing agent import 22 of main desulfurizing tower 20 can be had influence on after solids of sedimentation in the liquid pH value change of discharging in pre-desulfurizing tower 10 and solid-liquid separator 70, therefore the metrological service 30 ' arranged by desulfurizing agent import 22 place of main desulfurizing tower 20 controls first, second control valve 110, the aperture of 120 also can regulate the desulfurizing agent flow be delivered in pre-desulfurizing tower 10 and main desulfurizing tower 20, to guarantee that flue gas is stablized further, reliably desulfurization process.The utility model carrys out the disposal ability of regulating system to the sulfur-containing smoke gas that smelting furnace is discharged by Liang Ge metrological service 30,30 ' from many aspects, and not only automaticity is high but also result of use is good.In general, as high concentration SO
2when flue gas enters desulphurization system disclosed in the utility model, the desulfurizing agent flow that the aperture that the metrological service 30 utilizing liquid outlet 13 place of pre-desulfurizing tower 10 to arrange just can control to improve first, second control valve 110,120 is delivered in pre-desulfurizing tower 10 and main desulfurizing tower 20 with increase, thus pH feedforward control is achieved to the desulfurizing agent passing into main desulfurizing tower 20, make main desulfurizing tower 20 have enough time to adjust answering system change, and then ensure that flue gas is able to effective desulfurization and reaches outer row's standard.
Disclosed in the utility model, flue gas desulphurization system is when coming into operation, it is except being applicable to magnesium oxide method, also be applicable to the multiple wet methods such as calcium method, sodium method and limestone-gypsum method and carry out desulfurization process, in addition, metrological service 30,30 ' is when controlling to adjust the desulfurizing agent content be delivered in pre-desulfurizing tower 10 and main desulfurizing tower 20, except controlling the aperture of first, second control valve 110,120, also can pass through the duty of the parts such as the flowmeter controlling respective line is arranged and realize.
Claims (6)
1. a flue gas desulphurization system, it is characterized in that: comprise pre-desulfurizing tower (10) and main desulfurizing tower (20), the mouth (11) that enters of described pre-desulfurizing tower (10) is connected with the exhanst gas outlet of smelting furnace, the outlet flue (12) of pre-desulfurizing tower (10) is connected with the air inlet (21) of main desulfurizing tower (20), liquid outlet (13) place of pre-desulfurizing tower (10) and/or desulfurizing agent import (22) place of main desulfurizing tower (20) are provided with metrological service (30), described metrological service (30) comprises control unit and pH value detecting unit, pH value signal is also delivered to control unit by the liquid pH value in pH value detecting unit signal piping, control unit receives pH value signal and control and regulation input the desulfurizing agent flow in pre-desulfurizing tower (10) and/or main desulfurizing tower (20).
2. flue gas desulphurization system according to claim 1, it is characterized in that: described pre-desulfurizing tower (10) is provided with richness, poor desulfurizing agent import (14,15), rich desulfurizing agent import (14) is connected with the outlet (41) of desulfurizing agent storage tank (40), and poor desulfurizing agent import (15) exports (23) with the first liquid of main desulfurizing tower (20) and is connected.
3. flue gas desulphurization system according to claim 2, it is characterized in that: described flue gas desulphurization system also comprises regenerated liquid blending tank (50), regenerated liquid retort (60) and solid-liquid separator (70), the inlet of regenerated liquid blending tank (50) is connected with the liquid outlet (13) of the outlet (41) of desulfurizing agent storage tank (40) and pre-desulfurizing tower (10), the tap hole of regenerated liquid blending tank (50) is connected with the inlet of regenerated liquid retort (60), the inlet of solid-liquid separator (70), liquid outlet respectively with the liquid outlet of regenerated liquid retort (60), the desulfurizing agent import (22) of main desulfurizing tower (20) is connected, the metrological service (30) that desulfurizing agent import (22) place of main desulfurizing tower (20) the is arranged liquid pH value detected in the pipeline between the liquid outlet of regenerated liquid retort (60) with the desulfurizing agent import (22) of main desulfurizing tower (20) also controls to adjust the desulfurizing agent flow inputted from the outlet (41) of desulfurizing agent storage tank (40) pre-desulfurizing tower (10) and main desulfurizing tower (20).
4. flue gas desulphurization system according to claim 3, it is characterized in that: the side of described main desulfurizing tower (20) is provided with delivery pump (80), the entrance point of delivery pump (80) exports (24) with the liquid outlet of solid-liquid separator (70) and the upper second liquid arranged of main desulfurizing tower (20) and is connected, and the port of export of delivery pump (80) is connected with the desulfurizing agent import (22) of main desulfurizing tower (20).
5. flue gas desulphurization system according to claim 4, is characterized in that: the pipeline of first liquid outlet (23) of main desulfurizing tower (20) and the poor desulfurizing agent import (15) of pre-desulfurizing tower (10) is provided with liquid pump (90) and stop valve (100).
6. the flue gas desulphurization system according to claim 4 or 5, it is characterized in that: outlet (41) place of described desulfurizing agent storage tank (40) is provided with the pump (130) desulfurizing agent in desulfurizing agent storage tank (40) being delivered to pre-desulfurizing tower (10) and regenerated liquid blending tank (50), the pipeline of the rich desulfurizing agent import (14) of the pre-desulfurizing tower of outlet (10) of described pump (130) and the inlet of regenerated liquid blending tank (50) is respectively arranged with first, second control valve (110, 120), metrological service's (30 ') that the metrological service (30) of liquid outlet (13) place setting of pre-desulfurizing tower (10) and desulfurizing agent import (22) place of main desulfurizing tower (20) are arranged is by control first, second control valve (110, 120) aperture is to regulate the desulfurizing agent flow be delivered in pre-desulfurizing tower (10) and main desulfurizing tower (20).
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| CN201520161423.1U CN204582943U (en) | 2015-03-20 | 2015-03-20 | Flue gas desulphurization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104759195A (en) * | 2015-03-20 | 2015-07-08 | 金隆铜业有限公司 | Flue gas desulphurization system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104759195A (en) * | 2015-03-20 | 2015-07-08 | 金隆铜业有限公司 | Flue gas desulphurization system |
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