CN104689676A - Wet-process desulfurization wastewater utilization system and process - Google Patents
Wet-process desulfurization wastewater utilization system and process Download PDFInfo
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Abstract
The invention relates to a wet-process desulfurization wastewater utilization system and process. The system comprises a smoke inlet path, a dust collector, an absorption tower and a wastewater discharge pipeline which are connected in sequence, wherein a gas-liquid two-phase flow atomizer is arranged in the smoke inlet path; original smoke gas entering from the smoke inlet path is mutually acted with atomized wastewater jetted by the gas-liquid two-phase flow atomizer, subjected to dust removal through the dust collector and subjected to desulfurization treatment by entering the absorption tower; the obtained wastewater is conveyed to the gas-liquid two-phase flow atomizer through the wastewater discharge pipeline; the wastewater is sprayed out after being atomized through the gas-liquid two-phase flow atomizer; the atomized wastewater acts with the original smoke gas in a circulating mode, so that the wastewater is utilized. According to the wet-process desulfurization wastewater utilization system and the process thereof disclosed by the invention, a wastewater emission secondary pollution problem and a water resource loss problem are solved, and efficient reutilization of the wastewater in the system is realized, so that the wet-process desulfurization system is completely free of wastewater emission, and the power consumption is reduced; the dust collecting effects of the dust collector are greatly improved, so that the integral saving and environment-friendly effects of the wet-process desulfurization system are promoted. The wet-process desulfurization wastewater utilization system is suitable for being popularized and applied in relevant fields.
Description
Technical field
The Sewage treatment that the present invention relates to fume treatment generation utilizes technical field, particularly relates to wet desulphurization waste water utilization system and technique thereof, fully utilizes the waste water produced in smoke-gas wet desulfurization process.
Background technology
At present, boiler flue gas desulfurization is treated to master in a wet process, there is gas-liquid mass transfer and react in the wet desulfurizing process principle mainly unsaturated flue gas of high temperature and desulfurization slurry, flue gas cool-down humidification forms saturated flue gas, and the sour gas in flue gas and the reducing agent in slurries react and generate salt in absorption tower.Due in boiler smoke with a certain amount of chlorine root, in the mass-transfer progress of wet desulphurization process, the chlorine root in flue gas can be washed down and be accumulated in desulfurization slurry; Meanwhile, herein in reason process, add in the fresh water (FW) of desulphurization system also with a small amount of chlorion; These two kinds of chlorions above-mentioned are sources of chlorion in desulfurization slurry.Along with the carrying out of flue gas desulfurization process, the continuous cumulative rises of the chlorion in desulfurization slurry, and the chlorion of high concentration can cause very large corrosivity to material, meanwhile, chlorion content higher in slurries can reduce system desulfuration efficiency.Therefore, wet desulfurization system is in order to ensure that system chlorion is stabilized in finite concentration (General Requirements is below 20000ppm) and needs to get rid of a certain amount of waste water, make chlorion discharge desulphurization system along with waste water, thus ensure chlorion concentration in desulfurization slurry.The waste water that desulphurization system is discharged generally is entering domestic sewerage systems after serial abatement processes, but, even if inevitably desulfurization wastewater, after treatment still containing more salinity and heavy metal etc., still has larger pollution to environment.Moreover, because desulfurization wastewater is mainly from wet desulfurization system waste water treatment section such as lime stones, containing a small amount of solid and a large amount of material such as chlorion, sulfate inside waste water, conventional Waste Water Treatment discharges after the harmful substance by adding inside desulfurization wastewater in the material removal waste water such as coagulant, flocculation aid, alkali, acid again, this treatment process needs to add a large amount of chemical agents on the one hand, and economical operation cost is high.In addition, direct discharging of waste water wastes water resource, and for the 300MW unit generally used at present, every platform 300MW unit efflux wastewater amount is about 5t/h, and water consumption is huge, and energy loss is serious.
In prior art, patent of invention ZL201110076844.0 discloses a kind of zero emission treatment of desulfured waste water, comprise the following steps: 1) desulfurization wastewater after desulfurizing tower desulfurization is entered preliminary sedimentation tank, through initial gross separation in preliminary sedimentation tank, isolated upper clear supernate is transported in Buffer Pool through slush pump; 2) by the desulfurization wastewater in Buffer Pool successively by atomising device and electrostatic precipitator; 3) waste water larger for preliminary sedimentation tank bottom solid content is transported to sludge buffer pool through sludge pump, the waste water that the solid content in sludge buffer pool is larger is transported to filter press through another sludge pump; 4) waste water after filtration is sent back in preliminary sedimentation tank through slush pump; 5) by the filter mud outward transport after filtration.This invention achieves certain technique effect in using water wisely, but, in environmental protection, also there is filter mud outward transport process hidden danger, and the financial cost of equipment drops into high.
Therefore, for ensureing effective operation of wet desulfurization system device, avoiding equipment corrosion, meanwhile, effectively improving environment protecting, and saving water resource, need the technology developing the waste water that efficient smoke treatment wet desulphurization produces badly.
Summary of the invention
The object of the invention is, for existing wastewater desulfurized by fume wet treatment technology Problems existing, wet desulphurization waste water utilization system and technique thereof are provided, make full use of the system for cleaning fume equipment such as existing wet desulphurization denitration, carry out omnidistance optimum Integration Design, realize waste water in intrasystem efficient recycling, low cost strengthens environment protecting, reduce the loss of other equipment and materials of water resource, save the space other treatment facilities being set and taking, avoid equipment corrosion, meanwhile, fully improve environment protecting.
The technical scheme that the present invention deals with problems is: wet desulphurization waste water utilization system, comprise be connected successively flue, deduster, absorption tower and discharge of wastewater pipeline, wherein, in described flue, be provided with biphase gas and liquid flow atomizer.
Further, in wet desulphurization waste water utilization system of the present invention, described biphase gas and liquid flow atomizer is arranged on the smoke inlet place that described flue is connected with deduster.
Further, in wet desulphurization waste water utilization system of the present invention, described biphase gas and liquid flow atomizer has many groups, and described many group biphase gas and liquid flow atomizers are arranged in the cross section of flue with network structure.
Preferably, in wet desulphurization waste water utilization system of the present invention, described biphase gas and liquid flow atomizer comprises nozzle, air chamber, air intake duct, mixing tube, anemostat, wherein, described nozzle is connected with described air chamber, and described air chamber is connected with mixing tube with described air intake duct respectively, and described air intake duct is connected with outside air, one end and the described nozzle of described mixing tube are adjacent, and the other end of described mixing tube is connected with described anemostat.
Preferably, in wet desulphurization waste water utilization system of the present invention, described nozzle is located in described air chamber, and wherein, the entrance of described nozzle is connected with described discharge of wastewater pipeline, and outlet and the described mixing tube of described nozzle are adjacent.
Present invention also offers a kind of water reuse technique applied above-mentioned wet desulphurization waste water utilization system and carry out, after the atomization waste water that the former flue gas entered by flue and biphase gas and liquid flow atomizer are sprayed interacts, through deduster dedusting, flue gas after dedusting enters absorption tower and carries out desulfurization process, after desulfurization process, gained waste water is transported to biphase gas and liquid flow atomizer through discharge of wastewater pipeline, biphase gas and liquid flow atomizer is by ejection after waste water atomization, atomization waste water again with former Interaction Between Smoke, and so forth, waste water is utilized.
Further, in wet desulphurization water reuse technique of the present invention, the atomization waste water injection direction undertaken by described biphase gas and liquid flow atomizer is identical with former flue gas flow direction.
Further, in wet desulphurization water reuse technique of the present invention, the mist droplet particle size of the atomization waste water that described biphase gas and liquid flow atomizer sprays is less than 600 microns.
Further, in wet desulphurization water reuse technique of the present invention, described biphase gas and liquid flow atomizer spraying in former flue gas by uniformly continous after waste water atomization under compressed air effect.
Further, in wet desulphurization water reuse technique of the present invention, described biphase gas and liquid flow atomizer comprises nozzle, air chamber, air intake duct, mixing tube, anemostat, wherein, described nozzle is located in described air chamber, described air chamber is connected with mixing tube with described air intake duct respectively, described air intake duct is connected with outside air, the entrance of described nozzle is connected with described discharge of wastewater pipeline, the outlet of described nozzle and one end of described mixing tube adjacent, the other end of described mixing tube is connected with described anemostat; The air sucked from the external world is constantly transported in described air chamber by described air intake duct, in described air chamber, compresses air, and gained compressed air enters in described mixing tube; Waste water is transported in described nozzle by described discharge of wastewater pipeline, and waste water is sprayed onto in described mixing tube by described nozzle; In described mixing tube, the waste water that described nozzle sprays and compressed air meet, and under compressed-air actuated effect, waste water is atomized and also sprays from described anemostat, then with former Interaction Between Smoke.
Wet desulphurization waste water utilization system of the present invention makes full use of the system for cleaning fume equipment such as existing wet desulphurization denitration, on existing smoke-gas wet desulfurization treating apparatus basis, add-assembly can obtain, without the need to additionally taking up room, can not have any impact to original desulphurization system equipment, wherein, wet desulfurization system for transforming can be lime stone calcium method desulphurization system, ammonia method desulfurizing system, double alkali method desulfurizing system etc., in addition, wet desulphurization waste water utilization system of the present invention can also carry out add-assembly acquisition on the existing wet flue gas treating apparatus basis that other are relevant, as wet denitration system, wet method demercuration system, and the wet flue gas treating apparatus etc. that wet desulphurization denitration demercuration combines.Apply wet desulphurization waste water utilization system of the present invention and carry out water reuse, the water in waste water will be evaporated in flue gas and reduces flue-gas temperature and be humidified, and the salinity in waste water and solid matter discharge deduster after being collected by deduster along with the dust in flue gas; And, sprayed into the desulfurization wastewater of quantity at this, flue gas subsequently through the absorption tower of wet desulphurization just by the moisture of few evaporation quantity, thus reach water saving object, also really accomplish that wet desulfurization system is arranged without waste water outward; In addition, flue gas reduces owing to spraying into temperature after waste water, and the volume of flue gas will reduce, flows through the flue gas flow rate reduction of deduster, thus is beneficial to the dust removing effects of raising deduster; Meanwhile, the humidity of flue gas increases, and the ratio resistance of dust reduces, and also makes the efficiency of dust collection of deduster be improved thus; And the flue gas after decreasing temperature and increasing humidity is also beneficial to the corrosion reduced equipment.
Compared with prior art, the invention has the beneficial effects as follows: the secondary pollution problem and the water resource loss problem that efficiently solve discharge of wastewater, realize waste water in intrasystem efficient recycling, make the complete non-wastewater discharge of wet desulfurization system, using water wisely, meanwhile, significantly improve the dust removing effects of deduster, thus be also conducive to the raising of the overall fume treatment effect of subsequent wet desulphurization system; In addition, Operation system setting, and to add without the need to carrying out extra sewage treatment equipment without any impact existing equipment device, has relatively significantly saved the loss of equipment and materials, also saves the space that wet desulfurization system entirety takies; Generally, present invention achieves environment protecting enhancing and reduce the parallel of unification mutually with using water wisely and financial cost, and process operation simple optimizing, reliability is high, is suitable for need carrying out applying in the association area of high-temperature flue gas process in fire coal, fuel oil, combustion gas, thermal power plant, metallurgy, chemical industry, solid waste (rubbish) process etc.
Accompanying drawing explanation
Fig. 1 is the structural representation of wet desulphurization waste water utilization system of the present invention;
Fig. 2 is the biphase gas and liquid flow atomizer structure schematic diagram in embodiment 2 in wet desulphurization waste water utilization system of the present invention.
Shown in figure: 1-flue; 2-deduster; 3-absorption tower; 4-discharge of wastewater pipeline; 5-biphase gas and liquid flow atomizer, 501-nozzle, 502-air chamber, 503-air intake duct, 504-mixing tube, 505-anemostat.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be described.
Embodiment 1
As shown in Figure 1, a kind of wet desulphurization waste water utilization system of the present invention, comprise be connected successively flue 1, deduster 2, absorption tower 3 and discharge of wastewater pipeline 4, wherein, in described flue 1, be provided with biphase gas and liquid flow atomizer 5.
In the above-described embodiments, for strengthening water reuse effect, described biphase gas and liquid flow atomizer is preferably arranged on the smoke inlet place that flue 1 is connected with deduster 2; Preferably, described biphase gas and liquid flow atomizer 5 has many groups, many groups biphase gas and liquid flow atomizer 5 is arranged in the cross section of flue with network structure, fully contact with atomization waste water to make former flue gas, the utilization rate of abundant raising waste water, and can effectively prevent the atomization waste water ejiction opening of biphase gas and liquid flow atomizer 5 from blocking, ensure the stable and high effective operation of biphase gas and liquid flow atomizer 5.
In the above-described embodiments, described flue 1, deduster 2, it is indispensable that absorption tower 3 and discharge of wastewater pipeline 4 are the system for cleaning fume equipment institutes such as existing wet desulphurization denitration, existing equipment is made full use of after abundant Optimization analyses, wet desulphurization waste water utilization system of the present invention is obtained with the design of simplifying add-assembly on existing smoke-gas wet desulfurization treating apparatus basis, without the need to additionally taking up room, can not have any impact to original desulphurization system equipment, wherein, wet desulfurization system for transforming can be lime stone calcium method desulphurization system, ammonia method desulfurizing system, double alkali method desulfurizing system etc., also can be other relevant existing wet flue gas treating apparatus, as wet denitration system, wet method demercuration system, and the wet flue gas treating apparatus etc. that wet desulphurization denitration demercuration combines.
Apply wet desulphurization waste water utilization system of the present invention when carrying out water reuse, the existing wet desulfurization system for carrying out fume treatment normally runs, specifically unlike: after the atomization waste water that the former flue gas entered by flue 1 and biphase gas and liquid flow atomizer 5 are sprayed interacts, through deduster 2 dedusting, flue gas after dedusting enters absorption tower 3 and carries out desulfurization process, after desulfurization process, gained waste water is transported to biphase gas and liquid flow atomizer 5 through discharge of wastewater pipeline 4, biphase gas and liquid flow atomizer 5 is by ejection after waste water atomization, atomization waste water again with former Interaction Between Smoke, and so forth, waste water is utilized.
In above-mentioned water reuse embodiment, for the desulfurization wastewater that the waste water being transported to biphase gas and liquid flow atomizer 5 directly can discharge for self-absorption tower 3, also can be the waste water through different modes recycling.
In above-mentioned water reuse embodiment, for make former flue gas with atomization waste water abundant contact action, preferably, make the direction of described biphase gas and liquid flow atomizer 5 jet atomization waste water identical with former flue gas flow direction; Preferably, the mist droplet particle size of the atomization waste water that described biphase gas and liquid flow atomizer 5 sprays is less than 600 microns, fully fuses to make former flue gas and improves water reuse rate with atomization waste water; In addition, preferably, described biphase gas and liquid flow atomizer 5 spraying in former flue gas by uniformly continous after waste water atomization under compressed air effect, thus strengthen the speed of water reuse and the intensity with former smoke contacts thereof.
Applying wet desulphurization waste water utilization system of the present invention carries out in water reuse process, and in flue 1, the water chance high-temperature flue gas in waste water will be heated to be evaporated in flue gas and reduces flue-gas temperature and flue gas is humidified; Flue gas after humidifying cooling enters in deduster 2 and carries out dedusting, and the salinity in waste water and solid matter are collected rear discharge deduster 2 by along with the dust in flue gas by deduster 2; And, in the process, spray into the desulfurization wastewater of quantity, the moisture that flue gas just will evaporate less in the desulfurizing agent spray liquid (carrying out flue gas desulfurization with desulfurizing agent spray liquid in existing wet desulphurization absorption tower) of quantity subsequently when absorption tower 3, thus realize saving overall system water consumption, and then also achieve wet desulfurization system arrange outward without waste water and waste water in intrasystem comprehensive utilization; Moreover flue gas reduces owing to spraying into temperature after waste water, and the volume of flue gas will reduce, and the flue gas flow rate flowing through deduster 2 reduces, make flue gas time of staying increase in deduster 2, thus be beneficial to the dust removing effects of raising deduster 2; Meanwhile, the humidity of flue gas increases, and the ratio resistance of dust reduces, and also makes the efficiency of dust collection of deduster 2 be improved thus; And the flue gas after decreasing temperature and increasing humidity is also beneficial to the corrosion reduced equipment.In addition, it should be noted that, in the treatment systems such as existing smoke-gas wet desulfurization, former flue gas is high-temperature flue gas substantially, and the wastewater flow rate of wet desulfurization system is relatively less, atomization waste water can be vaporized drying faster under high-temperature flue gas effect, therefore, can not cause corrosion to relevant devices such as flue 1 and dedusters 2; And waste water solid content is low, the ratio that the total solid after waste water evaporation drying accounts for the ash content in flue gas is very low, can not impact ash composition, and the salinity in waste water and solid particulate matter are discharged with the ash content in flue gas.Generally, by above-mentioned application, effectively can solve secondary pollution problem and the water resource loss problem of discharge of wastewater, realize waste water in intrasystem efficient recycling, make the complete non-wastewater discharge of wet desulfurization system, achieve environment protecting and strengthen the parallel multiple effect reducing unification mutually with using water wisely and financial cost, and run simple optimizing, reliable and stable.
Embodiment 2
As depicted in figs. 1 and 2, a kind of wet desulphurization waste water utilization system of the present invention, its basic setup and application, with embodiment 1, for strengthening except wastewater utilization effect, and then improving the smoke desulfurization efficiency in downstream, also comprising following setting:
Described biphase gas and liquid flow atomizer 5 comprises nozzle 501, air chamber 502, air intake duct 503, mixing tube 504, anemostat 505, wherein, nozzle 501 is connected with air chamber 502, air chamber 502 is connected with mixing tube 504 with air intake duct 503 respectively, air intake duct 503 is connected with outside air, one end and the nozzle 501 of mixing tube 504 are adjacent, and the other end of mixing tube 504 is connected with anemostat 505.
In above-described embodiment, for strengthening waste water atomizing effect, waste water is made to be atomized into low granularity droplet grain, preferably, described nozzle 501 is located in air chamber 502, wherein, the entrance of nozzle 501 is connected with discharge of wastewater pipeline 4, outlet and the mixing tube 504 of nozzle 501 are adjacent, thus be beneficial to waste water be atomized under compressed air effect and uniformly continous spray, and then strengthen water reuse rate.
Apply above-mentioned wet desulphurization waste water utilization system when carrying out water reuse, the basic method of operation is with embodiment 1, on the basis of technique effect obtaining embodiment 1, the utilization ratio of waste water is improved, and especially the interactional intensity of waste water and former flue gas is improved; Particularly, in the process be atomized waste water in biphase gas and liquid flow atomizer 5, the air sucked from the external world is constantly transported in air chamber 502 by air intake duct 503, and in air chamber 502, compress air, gained compressed air enters in mixing tube 504; Waste water is transported in nozzle 501 by discharge of wastewater pipeline 4, and waste water is sprayed onto in mixing tube 504 by nozzle 501; In mixing tube 504, waste water and compressed air that nozzle 501 sprays meet, and under compressed-air actuated effect, waste water atomization also self-diffusion pipe 505 sprays, then with former Interaction Between Smoke.
The invention is not restricted to above-mentioned embodiment, those skilled in the art make to any apparent improvement of above-mentioned embodiment or change, all can not exceed the protection domain of design of the present invention and claims.
Claims (10)
1. wet desulphurization waste water utilization system, comprise be connected successively flue, deduster, absorption tower and discharge of wastewater pipeline, it is characterized in that, in described flue, be provided with biphase gas and liquid flow atomizer.
2. wet desulphurization waste water utilization system according to claim 1, is characterized in that: described biphase gas and liquid flow atomizer is arranged on the smoke inlet place that described flue is connected with deduster.
3. wet desulphurization waste water utilization system according to claim 1, is characterized in that: described biphase gas and liquid flow atomizer has many groups, and described many group biphase gas and liquid flow atomizers are arranged in the cross section of flue with network structure.
4. wet desulphurization waste water utilization system according to any one of claim 1 to 3, it is characterized in that: described biphase gas and liquid flow atomizer comprises nozzle, air chamber, air intake duct, mixing tube, anemostat, wherein, described nozzle is connected with described air chamber, described air chamber is connected with mixing tube with described air intake duct respectively, described air intake duct is connected with outside air, and one end and the described nozzle of described mixing tube are adjacent, and the other end of described mixing tube is connected with described anemostat.
5. wet desulphurization waste water utilization system according to claim 4, is characterized in that: described nozzle is located in described air chamber, and wherein, the entrance of described nozzle is connected with described discharge of wastewater pipeline, and outlet and the described mixing tube of described nozzle are adjacent.
6. an application rights requires the water reuse technique that the wet desulphurization waste water utilization system according to any one of 1 to 5 carries out, it is characterized in that, after the atomization waste water that the former flue gas entered by flue and biphase gas and liquid flow atomizer are sprayed interacts, through deduster dedusting, flue gas after dedusting enters absorption tower and carries out desulfurization process, after desulfurization process, gained waste water is transported to biphase gas and liquid flow atomizer through discharge of wastewater pipeline, biphase gas and liquid flow atomizer is by ejection after waste water atomization, atomization waste water again with former Interaction Between Smoke, and so forth, waste water is utilized.
7. water reuse technique according to claim 6, is characterized in that: the direction of the jet atomization waste water of described biphase gas and liquid flow atomizer is identical with former flue gas flow direction.
8. water reuse technique according to claim 6, is characterized in that: the mist droplet particle size of the atomization waste water that described biphase gas and liquid flow atomizer sprays is less than 600 microns.
9. water reuse technique according to claim 6, is characterized in that: described biphase gas and liquid flow atomizer spraying in former flue gas by uniformly continous after waste water atomization under compressed air effect.
10. water reuse technique according to claim 6, it is characterized in that: described biphase gas and liquid flow atomizer comprises nozzle, air chamber, air intake duct, mixing tube, anemostat, wherein, described nozzle is located in described air chamber, described air chamber is connected with mixing tube with described air intake duct respectively, described air intake duct is connected with outside air, the entrance of described nozzle is connected with described discharge of wastewater pipeline, the outlet of described nozzle and one end of described mixing tube adjacent, the other end of described mixing tube is connected with described anemostat;
The air sucked from the external world is constantly transported in described air chamber by described air intake duct, in described air chamber, compresses air, and gained compressed air enters in described mixing tube; Waste water is transported in described nozzle by described discharge of wastewater pipeline, and waste water is sprayed onto in described mixing tube by described nozzle; In described mixing tube, the waste water that described nozzle sprays and compressed air meet, and under compressed-air actuated effect, waste water is atomized and also sprays from described anemostat, then with former Interaction Between Smoke.
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| CN104689676B (en) | 2016-11-30 |
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