CN104147891B - A kind of device and method controlling the discharge of wet process of FGD fine grained - Google Patents
A kind of device and method controlling the discharge of wet process of FGD fine grained Download PDFInfo
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- CN104147891B CN104147891B CN201410422991.2A CN201410422991A CN104147891B CN 104147891 B CN104147891 B CN 104147891B CN 201410422991 A CN201410422991 A CN 201410422991A CN 104147891 B CN104147891 B CN 104147891B
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Abstract
The invention discloses a kind of device and method controlling the discharge of wet process of FGD fine grained, this device includes wet flue gas desulfurization tower, diffusion type steam jet, vapor mass flow controller, acoustic agglomeration room, acoustic wave generation unit, demister and flooding nozzle.Flue gas is regulated by this device, fine grained is reunited with growing up and is concentrated on acoustic agglomeration indoor with elimination effect and complete, efficiently avoid traditional acoustic to reunite and promote that the reunite efficiency grown up of fine grained is low, sound pressure level is high, the defect that energy consumption is big, avoid simultaneously and utilize steam phase transforming principle to promote when fine particle removes, single dependence adds the defect that energy consumption needed for the flue gas that steam makes moisture content low realizes supersaturation is significantly high, overcome the problem that steam phase transforming needs to set up conditioning chamber and phase change chamber simultaneously, simplify apparatus structure and operating cost, and do not change original Structure of Flue Gas Desulfuration Absorbing, realize the fine grain low energy consumption of wet process of FGD, efficient removal.
Description
Technical field
The invention belongs to pollution control equipment and manufacture field, be specifically related to a kind of device and method controlling the discharge of wet process of FGD fine grained.
Background technology
The fine particle particularly aerodynamic diameter particulate matter (PM less than 2.5 microns2.5) it is the primary pollutant of China's urban atmosphere, fire coal is one of main source of fine particle in China's air, along with haze weather takes place frequently, PM2.5Polluting and caused the extensive concern of the public and the great attention of government, the emission control of fine particle becomes the key issue being badly in need of solving.But at present tradition dedusting technology and equipment, for fine particle PM2.5Removal efficiency non-normally low, cause substantial amounts of PM2.5It is discharged in atmospheric environment.
The main path of current Fine Particles is the pretreatment measure that arranges before conventional dust removal equipment so that it is grown up for being removed after bulky grain by physically or chemically effect.These pretreatment measures include acoustic agglomeration, electromagnetism reunion and steam phase transforming etc..Wherein steam phase transforming preconditioning technique combines with a wet flue gas desulfurization technique is one of important channel controlling wet desulfurization fine particle of being fuming.Patent CN201105202Y, CN101219333A disclose the fine grain device of cooperation-removal in a kind of smoke-gas wet desulfurization, and this device by being respectively provided with smoke reutilizer and phase transformation condensing chamber before and after desulfurizing tower, it is achieved fine grain condensation growth；CN101732970B discloses the device and method promoting fine particle elimination in a kind of coal-burning wet flue gas desulfuration process, this device arranges prewashing column and steam phase transforming room before wet desulfuration tower, smoke moisture is improved by prewashing column, adding steam in phase change chamber makes flue gas reach supersaturation and undergo phase transition condensation growth, and the fine grained after condensation growth is removed by desulfurizing tower.Above technology adopts steam phase transforming to combine with wet loss of hairs sulfur, is provided with pretreatment chamber and phase change chamber so that technique becomes extremely complex, in addition, individually adopt steam phase transforming technology to obtain high condensation growth removal efficiency, it is necessary to high degree of supersaturation, increase steam consumption.Acoustic agglomeration is combined for the fine grained removing in flue gas with electric cleaner and sack cleaner respectively by acoustic agglomeration technology for public technology such as CN103736356 and the CN101637683A of Fine Particles.Both technology are all not involved with wet process of FGD and steam phase transforming, and individually adopt acoustic agglomeration technology, and the raising of fine grained reunion efficiency is very limited, will obtain good acoustic agglomeration efficiency, it is necessary to significantly high sound pressure level, significantly increase energy consumption.
For improving acoustic agglomeration efficiency, CN100531862C devises one and removes fine grain apparatus and method based on sound wave with additional seed grain synergy, although the method is conducive to improving fine grain removal efficiency, but owing to solid seed grain adds difficulty, it is difficult to be dispersed in air-flow, have impact on agglomerating effect, add solid particle simultaneously in the gas flow and increase again the load of dust remove of follow-up cleaner unit；CN103706219A proposes acoustic agglomeration and combines the apparatus and method of spraying synergy elimination fine particulates, this technology solves the problem that solid seed grain adds difficulty to a certain extent, but owing to the surface tension of drop itself is very big, it is difficult to be combined with fine grained, therefore, the raising of particle agglomeration efficiency is limited.Both the above technology all make use of the granule of different-grain diameter to carry the difference of coefficient in acoustic wavefield secretly, relative motion is caused to improve fine grain collision reunion efficiency, still fall within the category of acoustic agglomeration in essence, thus to obtain higher reunion efficiency and remain a need for higher sound pressure level, the sound pressure level such as CN103706219A work has reached 140dB～150dB.
Summary of the invention
Goal of the invention: for solving problems of the prior art, the present invention provides a kind of device and method controlling the discharge of wet process of FGD fine grained, by using acoustic agglomeration and steam phase transforming coupling as the fine grain pretreatment measure of dust-contained airflow, overcome traditional acoustic reunion efficiency low, sound pressure level is high, the shortcoming that energy consumption is big, solve seed grain in acoustic wavefield and add difficulty, sound pressure level is high, the problems such as subsequent treatment trouble, in combination with follow-up cleaner, achieve when low sound pressure levels, efficient removal fine particle, greatly reduce the energy consumption of acoustic agglomeration.
Technical scheme: for realizing above-mentioned technical purpose, the present invention proposes a kind of device controlling the discharge of wet process of FGD fine grained, it includes wet flue gas desulfurization tower, also include acoustic agglomeration room, the top exit of described wet flue gas desulfurization tower communicates with the lower entrances of described acoustic agglomeration room, and described wet flue gas desulfurization tower is for carrying out wet process of FGD to flue gas.
Wherein, described acoustic agglomeration room includes diffusion type steam jet, vapor mass flow controller, acoustic wave generation unit, demister and flooding nozzle,
Described diffusion type steam jet is arranged at the porch of described acoustic agglomeration chamber interior, spray direction is in opposite direction with flue gas, described vapor mass flow controller is arranged at the outside of described acoustic agglomeration room and is connected with described diffusion type steam jet, diffusion type steam jet injects steam into flue gas in a counter-current fashion and uses, and by the addition of steam flow controller adjustment steam, thus regulate the flue gas degree of supersaturation that acoustic agglomeration is indoor.
Described acoustic wave generation unit includes signal generator, power amplifier and at least one sound source, and described sound source is connected with the side of described acoustic agglomeration room by flexible anemostat, and described sound source is sequentially connected with signal generator and power amplifier；The integral multiple that distance is wavelength of sound source and acoustic agglomeration room offside can be regulated by regulating the length of the flexible anemostat that sound source is connected with acoustic agglomeration room, thus at the one or more standing-wave sound field of acoustic agglomeration indoor formation, regulated frequency and the sound pressure level of sound source by signal generator and power amplifier simultaneously.
Described demister and flooding nozzle are arranged at the top exit place of described acoustic agglomeration room；Described demister is arranged on the lower section of flooding nozzle, the flushing direction of described flooding nozzle is in opposite direction with flue gas, wherein, demister is for removing the fine particle of condensation growth, and flooding nozzle for regularly being carried out guaranteeing the efficiency of dust collection of demister to demister.
The number of sound source substantially can be determined according to treatment quantity, when the particle content of flue gas is too high, it is possible to arrange several sound source more.Preferably, the number of sound source is 2～8.
Preferably, the frequency of described sound source is 1600～2200Hz, and sound pressure level is 110dB～140dB.
As preferably, described demister is mesh mist eliminator or corrugated plating demister.
Described device is additionally provided with dust outlet in the bottom of acoustic agglomeration room.
The invention allows for a kind of method controlling the discharge of wet process of FGD fine grained, comprise the steps:
(A) wet process of FGD: high-temperature flue gas is introduced and carries out wet process of FGD in wet flue gas desulfurization tower；
(B) sound source running parameter is adjusted: select the operating frequency of sound source, calculate the wave length of sound under this operating frequency, the integral multiple that distance is wavelength of sound source and acoustic agglomeration room offside is made, with at acoustic agglomeration indoor formation standing-wave sound field by regulating the length of the flexible anemostat that sound source is connected with acoustic agglomeration room；
(C) steam phase transforming and acoustic agglomeration: the flue gas processed through wet process of FGD in step is introduced acoustic agglomeration room, temperature according to wet flue gas desulfurization tower exit flow, humidity, the flue gas degree of supersaturation S of flue gas flow and acoustic agglomeration room, calculate required steam addition, steam is sprayed into acoustic agglomeration chamber inlet place, make flue gas degree of supersaturation S >=1 of acoustic agglomeration room, open simultaneously and be arranged on the sound source that acoustic agglomeration is indoor, one or more sound sources are opened according to processing smoke condition, thus at the one or more standing-wave sound field of acoustic agglomeration indoor formation, the supersaturated vapor indoor at acoustic agglomeration undergoes phase transition condensation growth with the fine grained in flue gas for the nuclei of condensation, under the effect of standing-wave sound field, there is the reunion effect of growing up simultaneously；
(D) except mist discharges: the fine grained in flue gas removes through demister after step (C) is reunited and grown up, and the flue gas after purification is connected to smoke stack emission by air-introduced machine, and fine grained is then discharged by dust outlet.
Wherein it is preferred to, described in step (B), the operating frequency of sound source is 1600Hz～2200Hz, and sound pressure level is 110dB～140dB.
The operation principle of assembly of the invention is: heat smoke enters wet flue gas desulfurization tower, with doctor solution counter current contacting in desulfurizing tower, the water capacity making flue gas improves rapidly, general desulfurizing tower exiting flue gas humidity reaches more than 85%, desulfurizing tower outlet high-humidity gas fume enters into acoustic agglomeration room, injecting steam into by being arranged on the diffusion type steam jet at acoustic agglomeration chamber inlet place, owing to desulfurizing tower exiting flue gas water capacity is very high, only need to add a small amount of steam just can make flue gas degree of supersaturation S >=1；Start sound source, one or more sound source can be opened according to processing smoke condition simultaneously, at the one or more standing-wave sound field of acoustic agglomeration indoor formation, in acoustic agglomeration indoor, supersaturated vapor undergoes phase transition condensation growth with fine grained for the nuclei of condensation, under acoustic wave action, there is the reunion effect of growing up simultaneously, acoustic agglomeration and steam phase transforming are mutually promoted, greatly improve fine grained to reunite and grow up efficiency, drop after condensation growth is removed by demister, and by being arranged on the flooding nozzle in acoustic agglomeration ceiling portion, demister regularly is carried out guaranteeing the efficiency of dust collection of demister, the purifying smoke of acoustic agglomeration room outlet is connected to smoke stack emission.
Beneficial effect: the present invention is directed to the feature that wet fuel gas desulfurizing technology exiting flue gas moisture content is high, only need to add a small amount of steam can reach capacity or hypersaturated state, supersaturation flue gas is processed by application sound wave, make fine grained occur to reunite and phase transformation condensation growth under sound wave and phase transformation coupling effect simultaneously, greatly improve the reunion of fine particle to grow up efficiency, effectively reduce the sound field intensity of steam addition and acoustic agglomeration, adopt high efficiency demister that the drop of condensation growth is removed, it is achieved that efficient removal PM under low energy consumption2.5Purpose.By controlling to combine with sound wave phase transformation by wet fuel gas desulfurizing technology, efficiently avoid the defect that efficiency is low, sound pressure level is high, energy consumption is big that traditional acoustic reunion promotes fine grained reunion to grow up, avoiding when utilizing steam phase transforming principle to promote fine particle elimination, single dependence adds the defect that energy consumption needed for the flue gas that steam makes moisture content low realizes supersaturation is significantly high simultaneously.Acoustic agglomeration and steam phase transforming effect are combined, makes two kinds of effects mutually promote, greatly reduce the sound pressure level of acoustic agglomeration, decrease the energy consumption of acoustic agglomeration, and greatly improve fine grain removal efficiency.Simultaneously, flue gas is regulated by this device, fine grained reunites with growing up concentrates on acoustic agglomeration indoor with elimination effect and completes, overcome the problem that steam phase transforming needs to set up conditioning chamber and phase change chamber simultaneously, greatly simplify wet process of FGD and control the apparatus structure of fine grained discharge, simplify operation process and operating cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of assembly of the invention；
Fig. 2 is the structural representation of the preferred version of application assembly of the invention.
Detailed description of the invention
A kind of device controlling the discharge of wet process of FGD fine grained, as shown in Figure 1, including wet flue gas desulfurization tower 1 and acoustic agglomeration room 7, wet flue gas desulfurization tower 1 is internal arranges doctor solution nozzle 23 groups in parallel and a mist separator of desulfurization 3, and mist separator of desulfurization 3 is arranged at the top of doctor solution nozzle 2.The top exit of wet flue gas desulfurization tower 1 communicates with the lower entrances of acoustic agglomeration room 7, and wherein, acoustic agglomeration room 7 includes diffusion type steam jet 5, vapor mass flow controller 6, acoustic wave generation unit, demister 12 and flooding nozzle 13.Acoustic wave generation unit includes to 3 sound sources 8, power amplifier 9, signal generator 10 and telescopic flexible anemostat 11, sound source 8 is sequentially connected with power amplifier 9 and signal generator 10, wherein sound source 8 is connected with the side of acoustic agglomeration 7 by flexible anemostat 11, the integral multiple that distance is wavelength of sound source 8 and acoustic agglomeration room offside can be regulated by regulating the length of flexible anemostat 11, thus forming one or more standing-wave sound fields in acoustic agglomeration room 7, regulated frequency and the sound pressure level of sound source 8 by power amplifier 9 and signal generator 10 simultaneously.Diffusion type steam jet 5 is arranged at the porch within acoustic agglomeration room 7, and spray direction is in opposite direction with flue gas；Vapor mass flow controller 6 is arranged at the outside of acoustic agglomeration room 7 and is connected with diffusion type steam jet 5；Diffusion type steam jet 5 injects steam in flue gas in a counter-current fashion, and is regulated the addition of steam by steam flow controller 6, thus the flue gas degree of supersaturation regulated in acoustic agglomeration room 7.Demister 12 and flooding nozzle 13 are arranged at the top exit place of described acoustic agglomeration room 7；Demister 12 is arranged on the lower section of flooding nozzle 13, and the flushing direction of flooding nozzle 13 is in opposite direction with flue gas.In order to improve the fine grain emission effect of wet process of FGD further, assembly of the invention can also include an electrostatic precipitator 16, this electrostatic precipitator is connected with the entrance of wet flue gas desulfurization tower, can tentatively be removed the big dust particle in flue gas by electrostatic precipitator.
Illustrate that the present invention controls a specific embodiments of the technological process of fine grained discharge in coal-burning wet flue gas desulfuration process below in conjunction with Fig. 2.The high-temperature flue gas that coal-burning boiler 15 produces first passes through the big dust particle that electrostatic precipitator 16 is removed in flue gas, high-temperature flue gas after dedusting enters desulfurizing tower 1, reverse contact with the doctor solution of doctor solution nozzle 2 spray, flue-gas temperature is reduced to 50～65 DEG C by original 90～120 DEG C, smoke moisture brings up to more than 85% or close to hypersaturated state, the flue gas after desulfurization through desulfurizer mist eliminator 3 remove water smoke laggard enter acoustic agglomeration room 7.
Flue gas degree of supersaturation S according to the temperature of wet flue gas desulfurization tower 1 exiting flue gas, humidity, flue gas flow and acoustic agglomeration room 7, calculates required steam addition, and computing formula is as follows:
In formula, Q is exhaust gas volumn, and S is degree of supersaturation, and Ps is saturated vapor pressure during temperature T (T is flue-gas temperature),For initial flue gas relative humidity, ρvFor vapour density, m is steam mass flow, and P is the gross pressure of flue gas.
Select the operating frequency of sound source 8, calculate the wave length of sound under this operating frequency, the integral multiple that distance is wavelength of sound source 8 and acoustic agglomeration room 7 offside is made by regulating the length of the flexible anemostat 11 that sound source 8 is connected with acoustic agglomeration room 7, to form standing-wave sound field in acoustic agglomeration room 7, frequency and the sound pressure level of sound source 8 is regulated by signal power amplifier 9 and signal generator 10, the frequency of sound source 8 is arbitrarily adjustable within the scope of 1600～2200Hz, and sound pressure level is arbitrarily adjustable within the scope of 110dB～140dB.
After determining the frequency of steam addition and sound source 8, desulfurizing tower 1 is exported high-humidity gas fume and is incorporated into acoustic agglomeration room 7, open the diffusion type steam jet 5 being arranged on porch, acoustic agglomeration room 7 to inject steam into, steam addition is regulated, flue gas degree of supersaturation S >=1 in acoustic agglomeration room 7 by steam flow controller 6；Open sound source 8 simultaneously, one or more sound source 8 can be opened according to processing smoke condition simultaneously, one or more standing-wave sound fields are formed in acoustic agglomeration room 7, in acoustic agglomeration room 7, supersaturated vapor undergoes phase transition condensation growth with fine grained for the nuclei of condensation, under acoustic wave action, there is the reunion effect of growing up simultaneously, acoustic agglomeration and steam phase transforming are mutually promoted, greatly improve fine grained to reunite and grow up efficiency, drop after condensation growth is removed by demister 12, by being arranged on the flooding nozzle 13 at top, acoustic agglomeration room 7, demister 12 regularly is carried out guaranteeing the efficiency of dust collection of demister 12, the purifying smoke of acoustic agglomeration room 7 outlet is connected to chimney 18 by air-introduced machine 17 and discharges, fine grained is then discharged by the dust outlet bottom acoustic agglomeration room 7.
The present invention is directed to the feature that wet fuel gas desulfurizing technology exiting flue gas moisture content is high, only need to add a small amount of steam can reach capacity or hypersaturated state, supersaturation flue gas is processed by application sound wave, make fine grained occur to reunite and phase transformation condensation growth under sound wave and phase transformation coupling effect simultaneously, greatly improve the reunion of fine particle to grow up efficiency, effectively reduce the sound field intensity of steam addition and acoustic agglomeration, adopt high efficiency demister that the drop of condensation growth is removed, it is achieved that efficient removal PM under low energy consumption2.5Purpose.By controlling to combine with sound wave phase transformation by wet fuel gas desulfurizing technology, efficiently avoid the defect that efficiency is low, sound pressure level is high, energy consumption is big that traditional acoustic reunion promotes fine grained reunion to grow up, avoiding when utilizing steam phase transforming principle to promote fine particle elimination, single dependence adds the defect that energy consumption needed for the flue gas that steam makes moisture content low realizes supersaturation is significantly high simultaneously.Acoustic agglomeration and steam phase transforming effect are combined, makes two kinds of effects mutually promote, greatly reduce the sound pressure level of acoustic agglomeration, decrease the energy consumption of acoustic agglomeration, and greatly improve fine grain removal efficiency.Simultaneously, flue gas is regulated by this device, fine grained reunites with growing up concentrates on acoustic agglomeration indoor with elimination effect and completes, overcome the problem that steam phase transforming needs to set up conditioning chamber and phase change chamber simultaneously, greatly simplify wet process of FGD and control the apparatus structure of fine grained discharge, simplify operation process and operating cost.
Claims (8)
1. the device controlling the discharge of wet process of FGD fine grained, this device includes wet flue gas desulfurization tower (1), it is characterized in that, it also includes acoustic agglomeration room (7), and the top exit of described wet flue gas desulfurization tower (1) communicates with the lower entrances of described acoustic agglomeration room (7)；
Wherein, described acoustic agglomeration room (7) includes diffusion type steam jet (5), vapor mass flow controller (6), acoustic wave generation unit, demister (12) and flooding nozzle (13)；
Described diffusion type steam jet (5) is arranged at the porch that described acoustic agglomeration room (7) is internal, and spray direction is in opposite direction with flue gas；
Described vapor mass flow controller (6) is arranged at the outside of described acoustic agglomeration room (7) and is connected with described diffusion type steam jet (5)；
Described acoustic wave generation unit includes power amplifier (9), signal generator (10) and at least one sound source (8), described sound source (8) is connected with the side of described acoustic agglomeration room (7) by flexible anemostat (11), and described sound source (8) is sequentially connected with power amplifier (9) and signal generator (10)；
Described demister (12) and flooding nozzle (13) are arranged at the top exit place of described acoustic agglomeration room (7)；Described demister (12) is arranged on the lower section of flooding nozzle (13), and the flushing direction of described flooding nozzle (13) is in opposite direction with flue gas.
2. the device of control wet process of FGD fine grained according to claim 1 discharge, it is characterised in that the number of described sound source (8) is 2～8.
3. the device of control wet process of FGD fine grained according to claim 1 and 2 discharge, it is characterised in that the frequency of described sound source (8) is 1600Hz～2200Hz, and sound pressure level is 110dB～140dB.
4. the device of control wet process of FGD fine grained according to claim 1 discharge, it is characterised in that described demister (12) is mesh mist eliminator or corrugated plating demister.
5. the device of control wet process of FGD fine grained according to claim 1 discharge, it is characterized in that, the size of described acoustic agglomeration room (7) is determined by the exhaust gas volumn processed, it is ensured that flue gas in acoustic agglomeration room (7) the time of staying >=3 seconds.
6. the device of control wet process of FGD fine grained according to claim 1 discharge, it is characterised in that the bottom of described acoustic agglomeration room (7) is provided with dust outlet.
7. the method controlling the discharge of wet process of FGD fine grained, it is characterised in that comprise the steps:
(A) wet process of FGD: high-temperature flue gas is introduced in wet flue gas desulfurization tower (1) and carry out wet process of FGD；
(B) sound source running parameter is adjusted: select the operating frequency of sound source (8), calculate the wave length of sound under this operating frequency, the integral multiple that distance is wavelength of sound source (8) and acoustic agglomeration room (7) offside is made, to form standing-wave sound field in acoustic agglomeration room (7) by regulating the length of the flexible anemostat (11) that sound source (8) is connected with acoustic agglomeration room (7)；
null(C) steam phase transforming and acoustic agglomeration: the flue gas processed through wet process of FGD in step (A) is introduced acoustic agglomeration room (7)，Temperature according to wet flue gas desulfurization tower (1) exit flow、Humidity、The flue gas degree of supersaturation S of flue gas flow and acoustic agglomeration room (7)，Calculate required steam addition，Steam is sprayed into acoustic agglomeration room (7) porch，Make flue gas degree of supersaturation S >=1 of acoustic agglomeration room (7)，Open the sound source (8) being arranged in acoustic agglomeration room (7) simultaneously，One or more sound sources (8) are opened according to processing smoke condition，Thus forming one or more standing-wave sound fields in acoustic agglomeration room (7)，Supersaturated vapor in acoustic agglomeration room (7) undergoes phase transition condensation growth with the fine grained in flue gas for the nuclei of condensation，Under the effect of standing-wave sound field, there is the reunion effect of growing up simultaneously；
(D) except mist discharges: the fine grained in flue gas removes through demister after step (C) is reunited and grown up, flue gas after purification is connected to chimney (18) discharge by air-introduced machine (17), and fine grained is then got rid of by dust outlet.
8. method according to claim 7, it is characterised in that the operating frequency of described sound source (8) is 1600Hz～2200Hz, sound pressure level is 110dB～140dB.
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| CN201543378U (en) * | 2009-11-23 | 2010-08-11 | 尚俊法 | Wet flue gas desulfurization device using dilute ammonia water as desulfurizing agent |
| CN201949801U (en) * | 2011-01-14 | 2011-08-31 | 华电环保系统工程有限公司 | Flue gas desulfurization device of thermal power generating unit of burning high-sulfur coal |
| CN202823151U (en) * | 2012-09-19 | 2013-03-27 | 浙江蓝天求是环保集团有限公司 | Multistage spray efficient wet process of flue gas desulfurization and synergistic mercury removal integrated device |
| CN103706219B (en) * | 2013-12-26 | 2015-10-07 | 浙江大学 | Acoustic agglomeration combines the devices and methods therefor that spraying synergy removes fine particulates |
-
2014
- 2014-08-25 CN CN201410422991.2A patent/CN104147891B/en not_active Expired - Fee Related
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