CN103896353A - Waste heat recovery treatment method of desulfurization waste water - Google Patents
Waste heat recovery treatment method of desulfurization waste water Download PDFInfo
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- CN103896353A CN103896353A CN201410173340.4A CN201410173340A CN103896353A CN 103896353 A CN103896353 A CN 103896353A CN 201410173340 A CN201410173340 A CN 201410173340A CN 103896353 A CN103896353 A CN 103896353A
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Abstract
The invention discloses a waste heat recovery treatment method of desulfurization waste water. An atomization device is arranged inside a flue gas flue of a boiler; compressed air and desulfurization waste water enter the atomization device; the speed of a liquid drop atomized by the atomization device is 30-45m/s; the particle size of the liquid drop is smaller than 45mum; the atomization angle of the atomization device is smaller than 120 degrees; the length-width ratio of the atomization range is 1.0-3.0; the liquid drop is evaporated in the flue; crystal is discharged out of the flue along with the smoke and enters a dust collector. The desulfurization waste water is evaporated and discharged by using the flue gas waste heat of the boiler after being sprayed; heavy metals such as mercury, lead, nickel, zinc and the like and nonmetal pollutants such as arsenic, fluorine and the like in the desulfurization waste water become fine dust after being dried by the flue gas, enter a dust removal system along with the dust in the smoke, are captured by the dust collector and separated out from the flue gas; the desulfurization waste water is discharged together with the flue gas after being evaporated into steam, so that the pollution to the environment is not generated, and the actual requirements of energy conservation and environment protection are accorded.
Description
Technical field
The present invention discloses a kind of desulfurization wastewater waste heat recovery processing method, divides and belongs to desulfurization wastewater processing technology field by International Patent Classification (IPC) (IPC).
Background technology
2007, new " the national environmental protection Eleventh Five-Year Plan " promulgated of country explicitly calls in key industrys such as iron and steel, electric power, chemical industry, coals promoted cycling utilization of wastewater, strives for waste water and discharges less or zero release.2013, two high appearance judicial explanations: charges are born in discharge in violation of rules and regulations.In report for environmental influence evaluations national and at different levels, power plant desulfurization waste water is arranged to discharge outlet, explicitly call for " zero release ".At present, heat-engine plant wet desulfurization wastewater presents slightly acidic, suspended substance is many, particle is little, major ingredient is dust and desulfurization product (CaSO4 and CaSO3), the muriate and the fluorochemical etc. that contain solubility, also have the heavy metal such as mercury, arsenic and chromium, adopt still qualified discharge well of the chemical process waste water after treatment such as neutralization, flocculation, precipitation, cause waste water after treatment cannot enter system reuse.
Existing desulfuration waste water treatment process spills coal method, rushes grey method, embrane method etc., wherein: spill coal method and send coal yard, pouring use to, after processing, chlorion still enters in desulfurization wastewater with flue gas by firing system, cl concn cannot reduce, directly affect desulfuration efficiency, corrosion sweetener, reduces the sweetener life-span; Directly enter ash trench system, the amount of water required is limited, causes the corrosion of deashing device and pipeline, cannot fully utilize gypsum, and economic serviceability is not strong; Embrane method is that membrane separation technique separates, and treating processes produces dense water.
Chlorion, up to the desulfurization wastewater reuse technology of 20000mg/l, never possesses the technology of industrialization prospect, and desulfurization wastewater " zero release " is in awkward dilemma.Flue spray method is a kind of processing method of desulfurization wastewater processing, specifically with being pumped to front flue of dust collector, compressed air is by desulfurization wastewater atomization in front flue of dust collector, the method investment is less, running cost is lower, exhausted water drops in the subject matter that in flue gas, spray evaporation treatment technology faces: one, how to realize desulfurization wastewater evaporation rapidly after spraying, be to have a difficult problem to be solved always; Two, exhausted water drops in flue and evaporates, and likely causes the corrosion of flue and fly-ash separator.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of desulfurization wastewater waste heat atomization and vaporization device and treatment process, by the optimization to waste water drop atomization parameter, reach rapid evaporation effect.
For achieving the above object, the present invention is achieved by the following technical solutions:
A kind of desulfurization wastewater waste heat recovery processing method, is characterized in that: flue gas radial center and temperature in boiler flue arrange atomisation unit in the region of 110 ~ 160 DEG C; Utilize water pump to extract desulfurization wastewater, air compressor machine pressurized air, the pressure ratio that pressurized air and desulfurization wastewater enter in atomisation unit is 0.1 ~ 0.5; Liquid drop speed after atomisation unit atomization is 30～45m/s, and size droplet diameter is less than 45um, and wherein the spray angle of atomisation unit is less than 120 °, and the long-width ratio of spread of spray is between 1.0～3.0; After atomization and vaporization, discharge flue with flue gas and enter fly-ash separator.
The head of described atomisation unit is round table-like, and its round platform inclined-plane arranges that some spray orifices form the dispersive nozzle of ring-types, and the gas-vapor mix liquid in atomisation unit is sprayed and atomization forms drop by each spray orifice through shower nozzle blocking reflected.
Described atomisation unit apart from fly-ash separator between 10～20m.
The present invention will utilize residual heat from boiler fume to carry out discharge vaporization after desulfurization wastewater spraying, as long as control flue-gas temperature higher than acid dew-point temperature, just can not produce corrosion to flue and fly-ash separator, the non-metal contaminants such as the heavy metals such as mercury in desulfurization wastewater, lead, nickel, zinc and arsenic, fluorine become fine dusts after flue gas drying, enter dust-removal system with the dust in flue gas, catch from flue gas and separate by fly-ash separator, desulfurization wastewater discharges after flashing to steam together with flue gas, can environment not caused and be stained, meet the actual requirement of energy-conserving and environment-protective.
Brief description of the drawings
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is side-view of the present invention.
Fig. 3 is gas-vapor mix schematic diagram of the present invention.
Fig. 4 is shower nozzle of the present invention and spread of spray schematic diagram.
Fig. 5 is shower nozzle side-view of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
Embodiment: refer to Fig. 1 and Fig. 5, a kind of desulfurization wastewater waste heat recovery processing method arranges atomisation unit 2 in the interior radial center of boiler flue 1 and temperature in the region of 110 DEG C～160 DEG C; Utilize water pump 3 to extract desulfurization wastewater, air compressor machine or blower fan 4 pressurized air, the pressure ratio that pressurized air and desulfurization wastewater enter in atomisation unit 2 is 0.1～0.5; Liquid drop speed after atomisation unit atomization is 30～45m/s, and size droplet diameter is less than 45um, and wherein the spray angle of atomisation unit is less than 120 °, and the long-width ratio of spread of spray is between 1.0～3.0; After atomization and vaporization, discharge flue with flue gas and enter fly-ash separator.The head of atomisation unit 2 of the present invention is round table-like, and its round platform inclined-plane arranges that some spray orifices 200 form the dispersive nozzle of ring-type, and the gas-vapor mix liquid in atomisation unit is through shower nozzle blocking reflected and sprayed and atomization forms drop by each spray orifice.Atomisation unit apart from fly-ash separator between 10～20m.
Fig. 4 is nozzle atomization scope schematic diagram of the present invention, and in figure, the first width is A, and its corresponding length is D, the second width is that maximum width is B, and its corresponding length is F, and the maximum length of spraying is E, E:B is wherein 1.79, and the maximum subtended angle C of the present invention's spraying reaches 120 °.
Fig. 3 is gas-vapor mix schematic diagram of the present invention, extracts desulfurization wastewater enter atomisation unit at water pump 3 after well heater 51 is heated, and blower fan 4 pressurized air enter atomisation unit through well heater 52.
The configuration of atomisation unit of the present invention is applicable drop by desulfurization wastewater (dense water) atomization, water droplet and the high-temperature flue gas of being convenient to atomization conducts heat rapidly in design time, mass transfer, evaporation, prevent that drop from producing the not water of vaporization in fly-ash separator, to cohering of fly-ash separator polar curve, pole plate, more than the reduction of boiler smoke funnel temperature is controlled at flue gas acid dew point.
The present invention, by best flue gas mixed effect, determines drop atomizing particle size, and the structure of atomisation unit and material ensure drop atomizing particle size; The configuration of atomisation unit and best atomizing effect.
Above record, only, for utilizing the embodiment of this origination techniques content, modification, variation that any those skilled in the art use this creation to do, all belong to the scope of the claims that this creation is advocated, and be not limited to those disclosed embodiments.
Claims (3)
1. a desulfurization wastewater waste heat recovery processing method, is characterized in that: flue gas radial center and temperature in boiler flue arrange atomisation unit in the region of 110 ~ 160 DEG C; Utilize water pump to extract desulfurization wastewater, air compressor machine pressurized air, the pressure ratio that pressurized air and desulfurization wastewater enter in atomisation unit is 0.1 ~ 0.5; Liquid drop speed after atomisation unit atomization is 30～45m/s, and size droplet diameter is less than 45um, and wherein the spray angle of atomisation unit is less than 120 °, and the long-width ratio of spread of spray is between 1.0～3.0; After atomization and vaporization, discharge flue with flue gas and enter fly-ash separator.
2. desulfurization wastewater waste heat recovery processing method according to claim 1, it is characterized in that: the head of described atomisation unit is round table-like, its round platform inclined-plane arranges that some spray orifices form the dispersive nozzle of ring-types, and the gas-vapor mix liquid in atomisation unit is sprayed and atomization forms drop by each spray orifice through shower nozzle blocking reflected.
3. desulfurization wastewater waste heat recovery processing method according to claim 1 and 2, is characterized in that: described atomisation unit apart from fly-ash separator between 10～20m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410173340.4A CN103896353A (en) | 2014-04-28 | 2014-04-28 | Waste heat recovery treatment method of desulfurization waste water |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410173340.4A CN103896353A (en) | 2014-04-28 | 2014-04-28 | Waste heat recovery treatment method of desulfurization waste water |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104528852A (en) * | 2014-12-31 | 2015-04-22 | 华中科技大学 | Spraying device used for treating desulfurization waste water of power plant |
| CN105417604A (en) * | 2016-01-18 | 2016-03-23 | 重庆远达水务有限公司 | Method and device using fume residual heat to treat desulfurization waste water |
| CN106395952A (en) * | 2016-11-16 | 2017-02-15 | 重庆大学 | Desulphurization wastewater and hot flue gas multi-point spray evaporation system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2001010526A1 (en) * | 1999-08-05 | 2001-02-15 | U.S. Aquasonics Corporation | Method and apparatus for economical solid-liquid separation in water-based solutions |
| KR20010037431A (en) * | 1999-10-16 | 2001-05-07 | 천상석 | Management apparatus dirty water livestock raising |
| CN101844819A (en) * | 2010-05-21 | 2010-09-29 | 重庆大学 | Spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station |
| CN103214118A (en) * | 2013-04-03 | 2013-07-24 | 国家电网公司 | Method for treating waste water by utilizing dust-containing smoke gas of coal-fired boiler |
-
2014
- 2014-04-28 CN CN201410173340.4A patent/CN103896353A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001010526A1 (en) * | 1999-08-05 | 2001-02-15 | U.S. Aquasonics Corporation | Method and apparatus for economical solid-liquid separation in water-based solutions |
| KR20010037431A (en) * | 1999-10-16 | 2001-05-07 | 천상석 | Management apparatus dirty water livestock raising |
| CN101844819A (en) * | 2010-05-21 | 2010-09-29 | 重庆大学 | Spray evaporation treatment method of wet method flue gas desulfurization wastewater in thermal power station |
| CN103214118A (en) * | 2013-04-03 | 2013-07-24 | 国家电网公司 | Method for treating waste water by utilizing dust-containing smoke gas of coal-fired boiler |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104528852A (en) * | 2014-12-31 | 2015-04-22 | 华中科技大学 | Spraying device used for treating desulfurization waste water of power plant |
| CN104528852B (en) * | 2014-12-31 | 2016-05-25 | 华中科技大学 | A kind of sprayer unit for the treatment of power plant desulfurization waste water |
| CN105417604A (en) * | 2016-01-18 | 2016-03-23 | 重庆远达水务有限公司 | Method and device using fume residual heat to treat desulfurization waste water |
| CN105417604B (en) * | 2016-01-18 | 2018-11-20 | 重庆远达水务有限公司 | Utilize the method and device of fume afterheat processing desulfurization wastewater |
| CN106395952A (en) * | 2016-11-16 | 2017-02-15 | 重庆大学 | Desulphurization wastewater and hot flue gas multi-point spray evaporation system |
| CN106395952B (en) * | 2016-11-16 | 2019-04-30 | 重庆大学 | A kind of desulfurization wastewater and hot fume multi-point atomizing vapo(u)rization system |
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Application publication date: 20140702 |