CN112551627A - Desulfurization waste water enrichment facility and zero discharge system - Google Patents
Desulfurization waste water enrichment facility and zero discharge system Download PDFInfo
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- CN112551627A CN112551627A CN202011353764.0A CN202011353764A CN112551627A CN 112551627 A CN112551627 A CN 112551627A CN 202011353764 A CN202011353764 A CN 202011353764A CN 112551627 A CN112551627 A CN 112551627A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The invention provides a desulfurization wastewater concentration device which comprises a concentration tower, wherein the concentration tower is provided with a desulfurization wastewater inlet and a concentrated solution outlet, the concentration tower is provided with a concentration area for storing desulfurization wastewater, the concentrated solution outlet is positioned at the bottom of the concentration area, the concentration tower is also provided with a high-temperature gas inlet and a low-temperature gas outlet, the high-temperature gas inlet is close to and higher than the concentrated solution outlet, the low-temperature gas outlet and the desulfurization wastewater inlet are both positioned above the concentration area, the concentration area is provided with a bubble generator, and the bubble generator is communicated with the high-temperature gas inlet. According to the invention, the high-temperature flue gas directly exchanges heat with the desulfurization wastewater in the concentration zone in the form of bubbles, so that the purpose of concentrating the desulfurization wastewater is achieved, the equipment has no intermediate medium heat exchange problem, and the problem of scaling of the desulfurization wastewater in the concentration process is avoided.
Description
Technical Field
The invention relates to desulfurization wastewater treatment, in particular to a desulfurization wastewater concentration device and a zero discharge system.
Background
In the wet flue gas desulfurization process of the existing coal-fired power plants and industrial kilns, in order to remove pollutants such as acid gas, dust and the like in flue gas, waste water needs to be discharged at regular time, and limestone slurry needs to be supplemented. The discharged wastewater is the desulfurization wastewater which has the characteristics of acidity, high content of suspended matters, high content of heavy metals, high content of soluble chlorides and the like. At present, the most common domestic desulfurization wastewater treatment method is a chemical precipitation method, namely a three-header process, and most of suspended matters, heavy metals and the like are removed by physical and chemical methods through neutralization, precipitation, flocculation, clarification and the like, so that the desulfurization wastewater reaches the discharge standard. However, the wastewater treated by the method still contains a large amount of Ca2+，Mg2+，Cl—，SO4 2—If the plasma is directly discharged outside for a long time, the plasma can have serious influence on the surrounding water body. Meanwhile, with the improvement of national environmental standards, zero discharge of desulfurization wastewater becomes a necessary trend.
Aiming at the current situation, the current coal-fired power plant or industrial kiln provides a process scheme for treating desulfurization wastewater by using flue gas waste heat, one part is to concentrate the desulfurization wastewater by using flue gas, and the other part is to evaporate and crystallize the desulfurization wastewater by using flue gas.
In the scheme of utilizing the waste heat of the flue gas, a part of schemes are to take the flue gas before a dust remover, and the defects are that the flue gas has too large dust content, so that the subsequent heat exchange equipment is frequently blocked, and the flue gas contains a large amount of corrosive gas, so that the heat exchange equipment or other equipment is easily corroded, and meanwhile, the whole coal-fired efficiency of the boiler can be influenced by the taken amount of the flue gas, and even the operation safety of the subsequent equipment at the flue gas taking position is reduced; the other part scheme adopts flue gas and desulfurization waste water directly to pass through the heat exchanger heat transfer, leads to heat exchanger desulfurization waste water side scale deposit to block up very easily like this, and the heat exchanger must adopt high-grade anticorrosive material simultaneously, and is with high costs, and the heat exchanger needs regular chemical cleaning simultaneously, produces the danger waste product.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a desulfurization wastewater concentrating device and a zero discharge system.
The invention is realized by the following steps:
the invention provides a desulfurization wastewater concentration device which comprises a concentration tower, wherein the concentration tower is provided with a desulfurization wastewater inlet and a concentrated solution outlet, the concentration tower is provided with a concentration area for storing desulfurization wastewater, the concentrated solution outlet is positioned at the bottom of the concentration area, the concentration tower is also provided with a high-temperature gas inlet and a low-temperature gas outlet, the high-temperature gas inlet is close to and higher than the concentrated solution outlet, the low-temperature gas outlet and the desulfurization wastewater inlet are both positioned above the concentration area, the concentration area is provided with a bubble generator, and the bubble generator is communicated with the high-temperature gas inlet.
Further, still be provided with the bubble buffer board in the concentrated district, the bubble buffer board horizontal separation concentrated district, and in the equipartition has a plurality of bleeder vents on the bubble buffer board.
Furthermore, the bubble buffer plates are multiple, and the bubble buffer plates are sequentially arranged at intervals along the longitudinal direction of the concentration area.
Furthermore, the high-temperature air inlets are uniformly distributed along the circumferential direction of the bottom of the concentration area, the bubble generator is distributed along the cross section of the concentration tower, and a plurality of bubble holes are uniformly distributed on the bubble generator.
Further, concentrated district from top to bottom divides into full liquid level, well liquid level and low liquid level in proper order, wherein full liquid level is the highest liquid level of the new liquid of concentrated district's supplementary desulfurization waste water, well liquid level is the concentrated interior desulfurization waste water of concentrated district after need discharge the liquid level, low liquid level is the concentrated interior desulfurization waste water of district after need supply new liquid level.
The embodiment of the invention also provides a desulfurization wastewater zero-discharge system which comprises a high-temperature flue, a desulfurization tower and the concentration device, wherein the high-temperature flue is connected with the desulfurization tower, a liquid outlet of the desulfurization tower is communicated with the desulfurization wastewater inlet, the concentrated desulfurization wastewater discharged from the concentrated liquid outlet is sprayed into the high-temperature flue, and a low-temperature gas outlet is communicated with a gas inlet of the desulfurization tower.
Further, the high-temperature air inlet is communicated with the high-temperature flue.
The device further comprises an agglomeration complexing agent preparation device, wherein concentrated liquid discharged from a concentrated liquid outlet is introduced into the agglomeration complexing agent preparation device through a triple box, a liquid outlet of the agglomeration complexing agent preparation device is connected with a spray gun, and a nozzle of the spray gun extends into the high-temperature flue.
Furthermore, a dust remover is arranged on the high-temperature flue, a nozzle of the spray gun extends into the high-temperature flue in front of the dust remover, and a high-temperature air inlet and a low-temperature air outlet of the concentration device are communicated with the high-temperature flue behind the dust remover.
Furthermore, the two sets of the concentration devices are connected in parallel.
The invention has the following beneficial effects:
in the concentration device, when the desulfurization wastewater is concentrated, the desulfurization wastewater is introduced into the concentration area, the bubble generator is immersed in the desulfurization wastewater, high-temperature gas is introduced into the concentration tower through the high-temperature gas inlet, specifically high-temperature flue gas is introduced into the high-temperature flue, the high-temperature flue gas enters the bubble generator to generate bubbles, the bubbles float upwards along the desulfurization wastewater, and the bubbles exchange heat with the desulfurization wastewater, so that a large amount of water in the desulfurization wastewater can be evaporated, and the water is discharged from the low-temperature gas outlet, and the aim of concentrating the desulfurization wastewater is fulfilled. By the mode, the heat of the flue gas is fully utilized, the problem of heat exchange of an intermediate medium is solved, and the problem of scaling in the concentration process of the desulfurization wastewater is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a desulfurization wastewater zero-discharge system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a desulfurization wastewater zero-discharge system provided by an embodiment of the invention, which is provided with two groups of desulfurization wastewater concentration devices.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a desulfurization wastewater concentrating apparatus, including a concentrating tower 1, which is mainly used for concentrating desulfurization wastewater generated in a desulfurization tower 2, and has a desulfurization wastewater inlet 11 and a concentrated solution outlet 12, the desulfurization wastewater generated in the desulfurization tower 2 can enter the concentrating tower 1 through the desulfurization wastewater inlet 11, and the concentrated desulfurization wastewater is discharged from the concentrating tower 1 through the concentrated solution outlet 12; a concentration zone 13 is arranged in the concentration tower 1, the desulfurization wastewater entering the concentration tower 1 from the desulfurization wastewater inlet 11 is stored in the concentration zone 13, the concentration zone 13 is actually an internal space of the concentration tower 1, specifically, a section of space extending upwards from the bottom of the concentration tower 1, the above-mentioned concentrate outlet 12 is located at the bottom of the concentration zone 13, the bottom of the concentration tower 1 has a tapered structure 14 extending downwards, and the concentrate outlet 12 is at the bottom corner of the tapered structure 14, so that the desulfurization wastewater in the concentration tower 1 can be conveniently emptied, and the desulfurization wastewater inlet 11 is located at the upper end of the concentration tower 1, specifically, the upper end of the concentration zone 13, generally the side wall of the concentration tower 1 and a position close to the top; in addition, the concentration tower 1 is further provided with a high temperature gas inlet 15 and a low temperature gas outlet 16, wherein the high temperature gas inlet 15 is mainly used for introducing high temperature gas into the desulfurization tower 2, the high temperature gas can be high temperature flue gas generated after a deduster draught fan is adopted, the desulfurization wastewater in the concentration tower 1 is subjected to heat exchange concentration through the high temperature flue gas, the high temperature gas inlet 15 is arranged on the side wall of the concentration tower 1 and is close to and higher than the concentrated solution outlet 12, the low temperature gas outlet 16 is used for discharging gas generated in the concentration tower 1 in the concentration process, the gas is usually high temperature flue gas (with reduced temperature after heat exchange) and water vapor introduced into the concentration tower 1, the gas is also higher than the concentration zone 13 and is generally arranged at the top of the concentration tower 1, the top of the concentration tower 1 can also be provided with an upward extending tapered structure 17, the low temperature gas outlet 16 is arranged at the top angle position of the tapered structure 17, and the temperature of the gas outlet 16 is lower, it does not mean that the temperature of the gas it discharges is relatively low; a bubble generator 18 is further arranged in the concentration zone 13 of the concentration tower 1, the bubble generator 18 is arranged at a height close to the high-temperature gas inlet 15 and is communicated with the high-temperature gas inlet 15, namely, the high-temperature flue gas introduced into the concentration tower 1 by the high-temperature gas inlet 15 enters the bubble generator 18, so that a large amount of bubbles are generated in the concentration zone 13. In the invention, the concentration zone 13 is different from a desulfurization wastewater storage zone in the traditional concentration tower 1, the desulfurization wastewater storage zone is mainly used for storing concentrated desulfurization wastewater, but in the invention, the desulfurization wastewater directly flows into the concentration zone 13 instead of entering the desulfurization tower 2 in a spraying manner, for example, when the concentration is started, the desulfurization wastewater in the desulfurization tower 2 firstly flows into the concentration zone 13 from the desulfurization wastewater inlet 11, and when the desulfurization wastewater in the concentration zone 13 reaches a certain liquid level, high-temperature flue gas is introduced into the concentration tower 1 through the high-temperature gas inlet 15 to concentrate the desulfurization wastewater. Specifically, after replenishing desulfurization waste water in concentrated district 13, bubble generator 18 submergence is in the bottom position of desulfurization waste water, after letting in high temperature flue gas, bubble generator 18 can produce a large amount of bubbles, high temperature flue gas floats up gradually in desulfurization waste water with the form of bubble, and can directly exchange heat with desulfurization waste water at the in-process that floats up, desulfurization waste water temperature rises, and then can be so that the moisture in the desulfurization waste water evaporates in a large number, by low temperature gas outlet 16 discharge concentration tower 1, thereby reach the purpose of concentrated desulfurization waste water. By adopting the mode, the high-temperature flue gas can be fully contacted with the desulfurization wastewater, no conducting medium exists between the high-temperature flue gas and the desulfurization wastewater, the heat exchange efficiency is very high for direct heat exchange, and the scaling problem in the traditional desulfurization wastewater concentration process can be effectively avoided.
Optimizing above-mentioned embodiment, still being provided with bubble buffer plate 19 in concentrated district 13, this bubble buffer plate 19 horizontal partition concentrated district 13, and the equipartition has a plurality of bleeder vents on bubble buffer plate 19, and the bubble need pass corresponding bleeder vent along desulfurization waste water come-up in-process, shows that the size of bleeder vent is greater than the pore size on bubble generator 18. In the present embodiment, the bubble buffer plate 19 is horizontally arranged, and the bubble buffer plate 19 divides the condensation section 13 into upper and lower two spaces, although when the bubble buffer plate 19 is plural, the respective bubble buffering plates 19 are sequentially provided at intervals in the longitudinal direction of the condensation section 13, thereby dividing the condensation section 13 into n +1 when the number of the bubble buffering plates 19 is n, in a preferred embodiment, there are three bubble buffer plates 19, so that the three bubble buffer plates 19 divide the concentrating region 13 into four spaces, the air holes are uniformly distributed along the cross section of each bubble buffer plate 19, a large amount of bubbles generated by the bubble generator 18 float up along the desulfurization wastewater and need to pass through the air holes on each bubble buffer plate 19 in sequence, and when there are more bubbles, each bubble needs to pass through the corresponding air hole in sequence, and further the floating time of the bubbles can be delayed, so that the heat exchange between the high-temperature flue gas and the desulfurization wastewater can be fully realized.
Continuing to optimize the above embodiment, the number of the high temperature air inlets 15 is also plural, each high temperature air inlet 15 is uniformly arranged along the circumferential direction of the bottom of the concentration zone 13, actually, the high temperature air inlets 15 are uniformly arranged along the circumferential direction of the concentration tower 1, the bubble generator 18 is also arranged along the cross section of the concentration tower 1, the arrangement mode of the bubble generator is close to that of the bubble buffer plate 19, each high temperature air inlet 15 is communicated with the bubble generator 18, that is, the bubble generator 18 is used for introducing air from plural directions, in addition, the bubble buffer plate 19 is also uniformly distributed with a plurality of bubble holes, specifically, the bubble generator is uniformly distributed along the cross section of the concentration zone 13, and further, the bubble generator 18 can generate bubbles on the whole cross section of the concentration zone 13, so as to avoid the bubble generating positions from being excessively concentrated and being incapable of performing uniform heat. In the present invention, the bubble generator 18 is disposed at a position near the bottom of the concentration zone 13, specifically, at a top position of the tapered structure of the concentration zone 13, for example, when the tapered structure of the concentration zone 13 is an inverted cone, the bubble generator 18 is located at a top position of the inverted cone, and the desulfurization waste water can pass through the bubble generator 18 and enter a corresponding region of the tapered structure 14. Generally, the desulfurization waste water will form a certain amount of sedimentation in the concentration zone 13, when the concentrated solution outlet 12 is not opened, the sediment of the desulfurization waste water will be concentrated in the corresponding area of the tapered structure of the concentration zone 13, and in addition, because the bubble generator 18 is connected with the high temperature gas inlet 15, the temperature around the bubble generator 18 is highest in the concentration tower 1, i.e. the concentration efficiency of the desulfurization waste water in the area is highest, and further the concentration of the desulfurization waste water at the bottom of the concentration zone 13 is very high, so that after the desulfurization waste water in the concentration zone 13 is concentrated for a period of time, the concentration of the desulfurization waste water at the bottom is higher than that at the upper part thereof, specifically, along the height direction of the liquid level of the desulfurization waste water, the concentration of the desulfurization waste water is lower and lower, and further the concentrated solution outlet 12 can be opened for a period of time to discharge the desulfurization waste water with high concentration at the bottom, and then the concentrated solution outlet 12 is closed, meanwhile, new desulfurization wastewater is continuously added into the concentration zone 13, and the desulfurization wastewater in the concentration zone 13 is gradually concentrated to the required concentration through the periodic circulation, and is finally discharged from the concentrated solution outlet 12.
For the above-mentioned concentration mode, the concentration area 13 may be set with three liquid levels, which are a full liquid level, a middle liquid level and a low liquid level from top to bottom in sequence. Wherein the full liquid level is the highest liquid level of the desulfurization wastewater stored in the concentration zone 13, and the liquid level of the desulfurization wastewater in the concentration zone 13 and the liquid level after adding a new liquid (new desulfurization wastewater) are full liquid levels when aeration concentration is started; the middle liquid level is the liquid level when the desulfurization wastewater in the concentration zone 13 is concentrated and the lower part of high-concentration desulfurization wastewater needs to be discharged, namely, after the desulfurization wastewater in the concentration zone 13 is reduced to the middle liquid level from the full liquid level, the concentrated solution outlet 12 is opened and the high-concentration desulfurization wastewater at the bottom is discharged; the low liquid level is the liquid level after the high concentration desulfurization waste water discharges in the concentration zone 13, namely when the desulfurization waste water in the concentration zone 13 is reduced to the low liquid level from the middle liquid level, the concentrate outlet 12 is closed, the desulfurization waste water inlet 11 is opened simultaneously, new liquid is supplemented to the full liquid level in the concentration zone 13, and the concentration period in the concentration tower 1 is completed at this moment. Of course, the full level, the middle level and the low level are all detected by the level sensor 111 to control the corresponding actions, which can be set according to actual needs. In the invention, the concentration tower 1 adopts intermittent liquid feeding and discharging, and controls liquid feeding amount and liquid discharging amount through a liquid level sensor, wherein concentration multiplying power is (liquid discharging amount/(evaporation amount + liquid discharging amount), wherein the evaporation amount is the difference between a full liquid level and a middle liquid level, and the liquid discharging amount is the difference between the middle liquid level and a low liquid level, so that the concentration multiplying power is controllable and very convenient in the whole process.
Referring to fig. 1 again, an embodiment of the present invention further provides a desulfurization wastewater zero discharge system, including a high temperature flue 3, a desulfurization tower 2 and the above-mentioned concentration device, where the high temperature flue 3 is connected to the desulfurization tower 2, and high temperature flue gas in the high temperature flue 3 enters the desulfurization tower 2 to be subjected to wet desulfurization, so as to generate desulfurization wastewater, and generally, the high temperature flue 3 leads out high temperature flue gas generated in a boiler 4 or a kiln, and the high temperature flue gas is subjected to denitration treatment by a denitration device 8, treatment by an air preheater 33, a dust remover 6, and the like, then enters the desulfurization tower 2 to be treated, and finally is discharged to the external atmosphere by a chimney 9. Wherein the liquid outlet of desulfurizing tower 2 and the desulfurization waste water import 11 intercommunication of concentrating tower 1, the leading-in concentrating tower 1 of desulfurization waste water that desulfurizing tower 2 produced is concentrated, and concentrated back desulfurization waste water of concentrate export 12 exhaust of concentrating tower 1 then can spout into in high temperature flue 3, carry out the evaporative crystallization through the high temperature flue gas in the high temperature flue 3, low temperature gas outlet 16 then communicates with the air inlet of desulfurizing tower 2, concentrate exhaust flue gas and the water vapor that evaporates in the concentrating tower 1 and all get into in desulfurizing tower 2 again through low temperature gas outlet 16 promptly. In general, when the conventional process is used for heat exchange and concentration of desulfurization wastewater, bubbles are prevented from being generated in the concentration process, and particularly when spray concentration is performed, a bubble removing structure is usually required to be arranged to remove bubbles so as to prevent the bubbles from carrying the desulfurization wastewater, but in the invention, the concentration tower 1 adopts bubble heat exchange, and discharged gas is returned to the desulfurization tower 2 again. Before the concentrated desulfurization waste water is sprayed into the high-temperature flue 3, the desulfurization waste water flows into the triple box 5, the desulfurization waste water is precipitated and purified in the clarification tank 51 of the triple box 5, the precipitate in the clarification tank 51 is treated by the filter press 10 and then is specially treated, for example, the precipitate is transported by a truck, and the supernatant in the clarification tank 51 can be sprayed into the high-temperature flue 3 for evaporation and crystallization. Therefore, zero emission of the desulfurization wastewater can be realized in the whole process.
Referring to fig. 2, in the preferred embodiment, the high temperature inlet 15 of the concentrating tower 1 is in communication with the high temperature flue 3. Specifically, the high-temperature air inlet 15 is communicated with the high-temperature flue 3 behind the dust remover 6, that is, the high-temperature flue 3 between the dust remover 6 and the desulfurizing tower 2, and high-temperature flue gas purified and dedusted by the dust remover 6 can enter the concentrating tower 1 through the high-temperature air inlet 15. In this embodiment, a fan 31 is disposed in the high-temperature flue 3 between the dust remover 6 and the desulfurizing tower 2, wet desulfurization is performed on high-temperature flue gas introduced into the desulfurizing tower 2 by the fan 31, meanwhile, a branch pipe 32 is further connected to the section of the high-temperature flue 3, the branch pipe 32 extends to the high-temperature gas inlet 15, and another fan 321 is disposed in the branch pipe 32, so that a part of high-temperature flue gas discharged from the dust remover 6 can directly enter the desulfurizing tower 2, and a part of high-temperature flue gas can enter the concentrating tower 1 via the branch pipe 32 to exchange heat with desulfurization wastewater, of course, the fan 321 in the branch pipe 32 should adopt a booster fan, so that the pressure of flue gas at the high-temperature gas inlet 15 should be higher than the pressure of gas. Generally speaking, the dust collector 6 is an electrostatic dust collector 6 and a bag-type dust collector 6, the content of particulate matters in the high-temperature flue gas purified by the dust collector 6 is very low, the temperature can reach about 110 ℃, the temperature of the desulfurization wastewater discharged into the concentration tower 1 by the desulfurization tower 2 is generally 45 ℃, namely, in the concentration tower 1, the high-temperature flue gas at about 110 ℃ and the desulfurization wastewater at 45 ℃ are adopted for direct heat exchange, so that the energy loss is reduced, the temperature difference between the high-temperature flue gas and the desulfurization wastewater is large, the heat exchange efficiency is high, and the heat utilization rate of the flue gas is improved. In addition, a thermometer 110 is arranged in the concentration tower 1 and is used for detecting the temperature of each section in the concentration tower 1, for example, the temperature of the gas discharged from the concentration tower 1 is detected at the position, close to the low-temperature gas outlet, of the top of the concentration tower 1, when the concentration zone 13 is detected at the position, close to the bubble generator 18, for concentration heat exchange, the temperature of the desulfurization wastewater near the bubble generator 18, and if necessary, the temperature of the high-temperature flue gas at the high-temperature gas inlet 15 should also be detected, and by detecting the temperatures of these positions, the temperature can be used for judging the heat exchange condition between the bubbles in the concentration tower 1 and the desulfurization wastewater, and further can be used for adjusting the flow of the. The embodiment is continuously optimized, two groups of concentration devices are arranged, the two groups of concentration devices are connected in parallel, the connection arrangement of the high-temperature air inlet 15, the low-temperature air outlet 16, the desulfurization wastewater inlet 11 and the concentrated solution outlet 12 of the two groups of concentration devices is the same, and the two groups of concentration devices are connected with corresponding pipelines in the zero-emission system; in another kind of mode, when specifically being the desulfurization waste water emission in the desulfurizing tower is more, two sets of enrichment facility simultaneous working to the desulfurization waste water that produces in the rapid concentration desulfurizing tower guarantees concentration efficiency.
Further, the zero discharge system also comprises an agglomeration complexing agent preparation device 7, the desulfurization wastewater discharged from the concentrated solution outlet 12 is treated by the triple box 5 and then is led into the agglomeration complexing agent preparation device 7, namely, supernatant of a clarification tank 51 in the triple box 5 is led into the agglomeration complexing agent preparation device 7, the desulfurization wastewater and the agglomeration complexing agent are mixed according to the mass percentage to prepare an agglomeration complexing solution, then the agglomeration complexing solution is sprayed into the high-temperature flue 3 by a spray gun 71, wherein the high-temperature flue 3 is the high-temperature flue 3 in front of the dust remover 6, namely the boiler 4 or the high-temperature flue 3 between the kiln and the dust remover 6, specifically, the spray guns 71 are arranged in the front high-temperature flue 3 and the rear high-temperature flue 3 of the denitration device 8, the temperature of the high-temperature flue gas in the front high-temperature flue 3 of the denitration device 5 can reach 400-500 ℃, the temperature of the high-temperature flue gas in the rear high-temperature flue 3 of the denitration device 8 can reach, when the agglomerated composite solution is sprayed into the high-temperature flue 3 in the temperature range, the agglomerated composite solution can be quickly evaporated, and water is evaporated into steam which enters the dust remover 6 or the desulfurizing tower 2 along with flue gas or is discharged into the atmosphere. Most of various salts in the agglomerated composite liquid enter the dust remover 6 along with the fly ash to be collected, and a very small part of various salts enter the desulfurizing tower 2 (which can be ignored). Wherein the agglomerated composite solution can inhibit the activity of Cl ions in the desulfurization wastewater on one hand, and solves the problem that the desulfurization wastewater evaporates in the high-temperature flue 3 to corrode the high-temperature flue 3 and equipmentOn the other hand, the SO in the high-temperature flue gas can be trapped3Or other particulate matter to purify the high temperature flue gas. Based on the situation, the air preheater 33 in the flue behind the denitration device 8 can adopt the low-cost material Q355, so that the corrosion prevention cost is lower.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a desulfurization waste water enrichment facility, includes the concentrator column, the concentrator column has desulfurization waste water import and concentrate export, its characterized in that: the concentrated tower has the concentrated district that supplies desulfurization waste water to deposit, the concentrate export is located concentrated district bottom, still be provided with high temperature air inlet and low temperature gas outlet on the concentrated tower, the high temperature air inlet is close to and is higher than the concentrate export, the low temperature gas outlet with desulfurization waste water import all is located concentrated district top, and in concentrated district is provided with bubble generator, bubble generator with the high temperature air inlet intercommunication.
2. The desulfurization waste water concentrating apparatus according to claim 1, wherein: and a bubble buffer plate is further arranged in the concentration area, the bubble buffer plate is horizontally separated from the concentration area, and a plurality of air holes are uniformly distributed in the bubble buffer plate.
3. The desulfurization waste water concentrating apparatus according to claim 2, wherein: the bubble buffer plates are arranged in a plurality of numbers, and each bubble buffer plate is longitudinally arranged along the concentration area at intervals in sequence.
4. The desulfurization waste water concentrating apparatus according to claim 1, wherein: the high-temperature air inlets are uniformly distributed along the circumferential direction of the bottom of the concentration area, the bubble generator is distributed along the cross section of the concentration tower, and a plurality of bubble holes are uniformly distributed on the bubble generator.
5. The desulfurization waste water concentrating apparatus according to claim 1, wherein: the concentrated district from top to bottom divides into full liquid level, well liquid level and low liquid level in proper order, wherein full liquid level is the highest liquid level of concentrated district's supplementary new liquid of desulfurization waste water, well liquid level is the concentrated liquid level that needs discharge after desulfurization waste water is concentrated in the concentrated district, low liquid level is the concentrated district interior desulfurization waste water discharge back needs the supplementary new liquid level.
6. The utility model provides a desulfurization waste water zero discharge system, includes high temperature flue and desulfurizing tower, the high temperature flue with the desulfurizing tower is connected, its characterized in that: the concentration device of any one of claims 1 to 5, wherein the liquid outlet of the desulfurization tower is communicated with the desulfurization waste water inlet, the concentrated desulfurization waste water discharged from the concentrated solution outlet is sprayed into the high-temperature flue, and the low-temperature gas outlet is communicated with the gas inlet of the desulfurization tower.
7. The desulfurization waste water zero discharge system of claim 6, characterized in that: the high-temperature air inlet is communicated with the high-temperature flue.
8. The desulfurization waste water zero discharge system of claim 6, characterized in that: the device also comprises an agglomeration complexing agent preparation device, wherein concentrated solution discharged from a concentrated solution outlet is introduced into the agglomeration complexing agent preparation device through a triple box, a liquid outlet of the agglomeration complexing agent preparation device is connected with a spray gun, and a nozzle of the spray gun extends into the high-temperature flue.
9. The desulfurization waste water zero discharge system of claim 8, characterized in that: and a dust remover is arranged on the high-temperature flue, a nozzle of the spray gun extends into the high-temperature flue in front of the dust remover, and a high-temperature air inlet and a low-temperature air outlet of the concentration device are communicated with the high-temperature flue behind the dust remover.
10. The desulfurization waste water zero discharge system of claim 1, characterized in that: the concentration device is divided into two groups, and the two groups of concentration devices are connected in parallel.
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| CN202011353764.0A CN112551627B (en) | 2020-11-26 | 2020-11-26 | Desulfurization waste water enrichment facility and zero discharge system |
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| CN202011353764.0A CN112551627B (en) | 2020-11-26 | 2020-11-26 | Desulfurization waste water enrichment facility and zero discharge system |
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| CN116813010A (en) * | 2023-08-30 | 2023-09-29 | 上海鲁源控制设备有限公司 | Low temperature flue gas waste heat desulfurization waste water treatment equipment |
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