CN101844819A - Spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station - Google Patents
Spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station Download PDFInfo
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- CN101844819A CN101844819A CN 201010179796 CN201010179796A CN101844819A CN 101844819 A CN101844819 A CN 101844819A CN 201010179796 CN201010179796 CN 201010179796 CN 201010179796 A CN201010179796 A CN 201010179796A CN 101844819 A CN101844819 A CN 101844819A
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Abstract
The invention discloses a spray evaporation treatment method of the wet method flue gas desulfurization wastewater in a thermal power station. In the method, an atomizing nozzle is arranged in the region with the temperature at 413-470 K and the flue gas speed of 5-11 m/s in a flue of the boiler tail part; desulfurization wastewater is pumped by utilizing a water pump, air is compressed by a compressor, and the pressure ratio of the compressed air to the desulfurization wastewater entering into the atomizing nozzle is 0.25-0.6; the speed of liquid droplets atomized by the atomizing nozzle is 50-80 m/s, and particle diameters of the liquid droplets are less than 50 mu m; and the liquid droplets are evaporated and then exhausted out of a chimney together with the flue gas. The invention can save chemical drugs utilized in the conventional wastewater treatment method; overcome the defects of many apparatuses, large investment, high running cost and heavy apparatus repair and maintenance load of a wastewater treatment system in the prior art, overcome the great corrosion influence of chlorine ions in water meta-acidity environment, reduce the specific resistance of ashes in a dust collector and improve the dust collector efficiency through increasing the flue gas humidity and properly lowering the flue gas temperature.
Description
Technical field
The present invention relates to a kind of treatment process of heat-engine plant wet flue gas desulfurization waste-water, relate in particular to a kind of spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station.
Background technology
The treatment process of general heat-engine plant wet flue gas desulfurization waste-water is to adopt chemical processes such as neutralization, flocculation, precipitation to carry out.But because the special property of heat-engine plant wet desulfurization wastewater: present slightly acidic, the pH value is lower than 5.7; The suspension object height, but particle is tiny, and major ingredient is dust and desulfurization product (CaSO4 and CaSO3); The muriate and fluorochemical, the nitrate etc. that contain solubility; Also have heavy metals such as mercury, lead, nickel, arsenic and chromium, adopt the waste water qualified discharge well still after chemical processes such as neutralization, flocculation, precipitation are handled.Because the waste water chlorion (still do not have chemical agent at present and can remove chlorion) after the desulfurization wastewater chemical treatment method is handled still can't be removed, and chlorion has the big characteristics of corrodibility in the slant acidity water surrounding, waste water after causing handling can't enter system's reuse, and does not reach emission standard.
The industrial application of carrying out Conversion of energy with droplet evaporation of development in recent years is as the refrigeration agent spray cooling technology in the intrasystem mist cooling of droplet evaporation, power vent in the firing system, spraying coating process, the laser surgey etc.Its common trait is to utilize nozzle with the liquid uniform atomizing, and drop absorbs heat from air-flow, evaporates in the extremely short time then.Thereby this spray evaporation treatment technology with droplet evaporation absorption heat has significant advantages such as heat exchange is abundant, the time spent short, energy-conservation.
Therefore, if will utilize residual heat from boiler fume to carry out discharge vaporization after the desulfurization wastewater spraying, as long as the control flue-gas temperature is higher than acid dew-point temperature, just can not produce corrosion to flue and electric precipitator, non-metal contaminants such as heavy metals such as the mercury in the desulfurization wastewater, lead, nickel, zinc and arsenic, fluorine become fine dusts behind flue gas drying, enter dust-removal system with dust in flue gas, catch from flue gas by fly-ash separator and to separate, desulfurization wastewater discharges with flue gas after flashing to steam, can not cause and stain, meet the actual requirement of energy-conserving and environment-protective environment.
Handle if utilize the boiler tail flue gas waste heat that desulfurization wastewater is carried out spray evaporation, just can realize the zero release that desulfurization wastewater is real, meet the actual requirement of energy-conserving and environment-protective.Exhausted water drops in the subject matter that the spray evaporation treatment technology faces in the low-temperature flue gas: one, how to realize desulfurization wastewater evaporation rapidly after spraying, be that a difficult problem to be solved is arranged always; Two, exhausted water drops in the low-temperature flue gas and evaporates, and can reduce flue-gas temperature and increase smoke moisture, might cause the corrosion of flue and fly-ash separator.
Summary of the invention
In order to address the above problem, the invention provides a kind of spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station, this method control drop spray into particle diameter and speed, and the temperature of flue gas and flow velocity, the decoration form of atomizing nozzle, thereby the time that the control drop evaporates fully,, avoid the corrosion of flue gas to flue and fly-ash separator to reach the purpose of control flue-gas temperature and humidity.
Spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station provided by the invention, velocity of flue gas is 5～11m/s in boiler back end ductwork, and temperature is provided with atomizing nozzle in the zone of 413K～470K; Utilize water pump to extract desulfurization wastewater, the pressure ratio that air compressor machine pressurized air, pressurized air and desulfurization wastewater enter in the atomizing nozzle is 0.25～0.6; Liquid drop speed after the atomizing nozzle atomizing is 50～80m/s, and size droplet diameter is less than 50um; Discharge chimney with flue gas behind the atomization and vaporization.
Further, described atomizing nozzle is at least two, in flue with the vertical cross section of flue gas flow rate on, zero dimension between atomizing nozzle longitudinal pitch and the flue sectional area is closed and is: during boiler capacity≤220t/h, L=2.7-7.7S; Boiler capacity when 220～1000t/h, L=1.7-0.7S; During boiler capacity 〉=1000t/h, L=0.9+0.13S, wherein L represents the ratio of nozzle longitudinal pitch and 0.3m, S represents that flue sectional area and boiler capacity are the ratio of the corresponding flue sectional area of 1000t/h; On the flue gas flow rate parallel direction, the transverse pitch between the atomizing nozzle is greater than 5 meters;
Further, the described zone of atomizing nozzle that is provided with is between the low temperature air preheater and fly-ash separator of boiler back end ductwork.
Compared with prior art, spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station has following advantage:
1, adopt waste water drop evaporation process method can save the pharmaceutical chemicals that conventional method of wastewater treatment adopts.
2, adopt waste water drop evaporation process method can overcome the shortcoming that the Waste Water Treatment configuration device is many in the prior art, investment is big, running cost is high and the equipment repair and maintenance amount is big.
3, after employing waste water drop evaporation process method was handled, the chlorion in the waste water was caught by fly-ash separator with the formation of particulate matter, has overcome chlorion big influence of corrodibility in the slant acidity water surrounding in the prior art.
4, because of the evaporation heat absorption of desulfurization wastewater atomizing back, the increase of smoke moisture and the reduction of flue-gas temperature have reduced the ratio resistance of ash in the fly-ash separator, have improved dust collector efficiency.
5, the waste water drop evaporation process technology of Cai Yonging can realize the actual requirement of energy-conserving and environment-protective.
Description of drawings
Accompanying drawing is a structural representation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done explanation in further detail.
Spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station at first is provided with desulfurization wastewater spray evaporation treatment system, as shown in the figure on boiler 4 back-end ductworks.Velocity of flue gas is 5～11m/s in boiler 4 back-end ductworks, and temperature is provided with atomizing nozzle 1 in the zone of 413K～470K, and temperature is higher than flue gas dew point t
1d, flue gas dew point calculates according to the percentage ratio of water vapour in the flue gas and sulphur trioxide pressure component, that is:
t
1d＝186+201lgH
2O+26lgSO
3。Utilize the desulfurization wastewater 5 after the 9 pairs of discharge tail gas in water pump 2 extraction absorption towers are handled, air compressor machine 3 pressurized air; Desulfurization wastewater 5 and pressurized air insert atomizing nozzle 1 simultaneously, control pressurized air and desulfurization wastewater well to enter pressure in the atomizing nozzle 1, and pressure ratio is 0.25～0.6; Liquid drop speed after atomizing nozzle 1 atomizing is 50～80m/s, and size droplet diameter is less than 50um; Drop after the atomizing evaporates fully in this zone, can discharge chimney 6 thereby reach with flue gas after desulfurization wastewater evaporates in back-end ductwork.
In flue with the vertical cross section of flue gas flow rate on, zero dimension between atomizing nozzle longitudinal pitch and the flue sectional area is closed and is: during boiler capacity≤220t/h, L=2.7-7.7S; Boiler capacity when 220～1000t/h, L=1.7-0.7S; During boiler capacity 〉=1000t/h, L=0.9+0.13S, wherein L represents the ratio (length of considering spray atomization angle and liquid drop movement is got 0.3m) of nozzle longitudinal pitch and 0.3m, and S represents that flue sectional area and capacity are the ratio of the corresponding flue sectional area of 1000t/h boiler.On the flue gas flow rate parallel direction, the transverse pitch between the atomizing nozzle is greater than 5 meters, when boiler capacity during smaller or equal to 220t/h, arrange 1 fog discharge nozzle, boiler capacity is arranged 2 fog discharge nozzles when 220～1000t/h, when boiler capacity during, arrange 3 fog discharge nozzles greater than 1000t/h.It is 25L/h that atomizing nozzle in the present embodiment is chosen nozzle flow, mainly avoid the drop behind the back-end ductwork internal spraying to occur intersecting, the drop that reaches after the spraying atomizes fully, the quantity of atomizing nozzle 1 can be determined according to actual needs, is 4.2m for certain the separate unit 300MW of power plant generator set desulfurization wastewater flow rate for example
3/ h, flue sectional area 42m
2Situation, getting the two-fluid spray nozzle flow is 25L/h, only need by top described with the vertical flue of flue gas flow rate cross section on arrange that nozzle can satisfy the processing of desulfurization wastewater amount.
The atomizing zone is arranged between the interchanger 7 and fly-ash separator 8 of boiler back end ductwork, neither influence the heat-exchange capacity of interchanger, can make non-metal contaminants such as heavy metal such as mercury after the desulfurization wastewater evaporation, lead, nickel, zinc and arsenic, fluorine behind flue gas drying, become fine dusts again, enter dust-removal system with dust in flue gas, catch from flue gas by fly-ash separator 8 and separate.
Specifically describe as embodiment with certain power plant's separate unit 300WM unit below.
Choosing the interior velocity of flue gas of boiler back end ductwork is 5～11m/s, and temperature is in the zone of 413K～470K, in flue with the vertical cross section of flue gas flow rate on, it is L=0.9+0.13S that zero dimension between nozzle longitudinal pitch and the flue sectional area is closed, wherein L represents the ratio of the length (getting 0.3 meter) of nozzle longitudinal pitch and consideration spray atomization angle and liquid drop movement, and S represents that flue sectional area and capacity are the ratio of the corresponding flue sectional area of 1000t/h boiler; On the flue gas flow rate parallel direction, transverse pitch between the nozzle is greater than 5 meters, arrange 2 row's nozzles, atomizing nozzle keeps flow 25L/h, compressed air pressure 0.4MPa, controls vapour-liquid ratio in 0.25～0.6 scope by the aperture of regulating pressurized air spinner-type flowmeter inlet valve, and the liquid drop speed after atomizing nozzle 1 atomizing is 50～80m/s, show after testing, can atomized particle diameter less than the symmetrical liquid drop of 50um, drop can evaporation gasification fully in 1 second, and is as shown in the table.
Improve flue-gas temperature, density and flow velocity under the situation that does not influence boiler output as much as possible, flue-gas temperature is high more, and the complete evaporation time of drop is short more, and flue-gas temperature descends more little, and is far away more apart with acid dew point; Drop density is big more, the easy more fragmentation of the drop that particle diameter is bigger, and the complete evaporation time of drop is short more; Flue gas flow rate is big more, and under the pressure of a certain amount of compressed air pressure and desulfurization wastewater, the gas-liquid speed of relative movement is big more, the easy more fragmentation of bigger drop, the complete evaporation time of all drops can be short more, and the vaporization efficiency of drop is just high more, and waste water evaporation process efficient is just high more.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technical scheme of the present invention, and not breaking away from the aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (3)
1. spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station, it is characterized in that: velocity of flue gas is in 5～11m/s and the zone of temperature at 413K～470K atomizing nozzle (1) to be set in boiler (4) back-end ductwork; Utilize water pump (2) to extract desulfurization wastewater (5), the pressure ratio that air compressor machine (3) pressurized air, pressurized air and desulfurization wastewater (5) enter in the atomizing nozzle (1) is 0.25～0.6; Liquid drop speed after atomizing nozzle (1) atomizing is 50～80m/s, and size droplet diameter is less than 50um; Discharge chimney (6) with flue gas behind the atomization and vaporization.
2. spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station according to claim 1, it is characterized in that: described atomizing nozzle (1) is at least two, in flue with the vertical cross section of flue gas flow rate on, zero dimension between atomizing nozzle (1) longitudinal pitch and the flue sectional area is closed: during boiler capacity≤220t/h, and L=2.7-7.7S; Boiler capacity when 220～1000t/h, L=1.7-0.7S; During boiler capacity 〉=1000t/h, L=0.9+0.13S, wherein L represents the ratio of nozzle longitudinal pitch and 0.3m, S represents that flue sectional area and boiler capacity are the ratio of the corresponding flue sectional area of 1000t/h; On the flue gas flow rate parallel direction, the transverse pitch between the atomizing nozzle (1) is greater than 5 meters.
3. spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station according to claim 1 and 2 is characterized in that: the described zone that atomizing nozzle (1) is set is positioned between the interchanger (7) and fly-ash separator (8) of boiler (4) back-end ductwork.
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