CN109127144A - High frequency couples fine particle with pulse point domain and system is removed in depth - Google Patents

High frequency couples fine particle with pulse point domain and system is removed in depth Download PDF

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Publication number
CN109127144A
CN109127144A CN201811240543.5A CN201811240543A CN109127144A CN 109127144 A CN109127144 A CN 109127144A CN 201811240543 A CN201811240543 A CN 201811240543A CN 109127144 A CN109127144 A CN 109127144A
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Prior art keywords
high frequency
electric field
electric
pulse
fine particle
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CN201811240543.5A
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Inventor
许月阳
杨希刚
薛建明
仲兆平
李永生
管明
管一明
王宏亮
许军进
徐崞铭
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Guodian Science and Technology Research Institute Co Ltd
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Guodian Science and Technology Research Institute Co Ltd
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Priority to CN201811240543.5A priority Critical patent/CN109127144A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/66Applications of electricity supply techniques
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00Details of magnetic or electrostatic separation
    • B03C2201/24Details of magnetic or electrostatic separation for measuring or calculating parameters, efficiency, etc.

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  • Electrostatic Separation (AREA)

Abstract

The present invention, which provides a kind of high frequency and couples fine particle with pulse point domain, is removed in depth system, electric precipitator at least configures three-level electric field in the system, the preceding electric field of electric precipitator is powered using high-frequency direct-current power supply, electric field is powered using the pulse power afterwards, and is equipped with two-way multi-region water conservancy diversion current equalizer in electric precipitation entrance reducer.Preceding electric field compartment removes 2.5 μm or more thick dust particles using high frequency electric source economical and efficient, electric field compartment removes 2.5 μm or less particle dusts using pulse power emphasis economical and efficient afterwards, breach the technical bottleneck that dry electric precipitation is difficult to economical and efficient trapping fine solid particle, and an investment economy and the place limitation of technological transformation project have been taken into account, electric precipitator outlet soot emissions energy-saving mode can be stablized lower than 10mg/m3, high effective model can be lower than 5mg/m3

Description

High frequency couples fine particle with pulse point domain and system is removed in depth
Technical field:
The invention belongs to flue dust minimum discharge technical fields, specifically the technologies such as are homogenized in real time using high frequency electric source, the pulse power, flow field The high-efficiency particulate removing system for devising a kind of high frequency+pulse point domain coupling matching, for flow field control accurate, strengthens thin The charged coalescence of grain improves mercury oxidation and accumulation ability, to realize high-effective dust-removing, energy saving and efficiency increasing and collaboration demercuration.
Background technique:
As coal-fired flue-gas is discharged into history the stage processed of most keeping under strict control, granular material discharged control is required to meet ultralow limit value 10mg/ m3, even lower gas fired-boiler emission limit 5mg/m3It is required that conventional dry electrostatic precipitation technology faces, fine grained difficulty is charged, high energy The series techniques bottleneck such as consumption and rapping escape, transform cloth bag as or electric bag composite dedusting technology will increase dramatically investment, and increases Operating power consumption is significantly increased in air and gas system resistance, and is limited to the factors such as place space, transformation duration, accessories rebuilding.Such as Original Process ba- sis can be based oneself upon, realizes that dedusting mentions effect, energy-saving run and the discharge of ultralow limit value, technology, economy, environment, society Benefit will be than more significant.
Traditional electrostatic precipitation technology is difficult to charged trapping, especially less than 1 μm of fine powder to 2.5 μm and following subparticle Dirt is even more too far behind to catch up, and electric precipitation rapping especially final stage electric field rapping will lead to the fine dust escape being captured in addition, at The technical bottleneck broken through is difficult to for electric precipitator.In addition, simple increase dust charged ability by improving charged power and voltage, It is too low to improve trapping efficiency of dust collection cost performance.Therefore, 2.5 μm are solved and following subparticle is charged, especially less than 1 μm micro- Fine dust is charged, is that electric precipitator makes a breakthrough and realize that outlet dust concentration reaches 10mg/m3Minimum discharge requirement, even 5mg/m3The technical bottleneck of gas fired-boiler standard limit of smog release.Therefore, divide Dust Characteristics and its charged demand according to different-grain diameter And comprehensively considering different input conditions, the high-efficiency low energy consumption dedusting technology and equipment that exploitation novel power supply is coupled have real Use meaning.
Summary of the invention:
The present invention existing technology there are aiming at the problem that, a kind of dual power supply point domain is provided and couples accurate dust pelletizing system.
The specific technical solution of the present invention is as follows:
A kind of high frequency couples fine particle with pulse point domain and system is removed in depth, and electric precipitator at least configures three-level in the system The preceding electric field of electric field, electric precipitator is powered using high frequency electric source, and rear electric field is powered using the pulse power, and in electric precipitation entrance Reducer is equipped with two-way multi-region water conservancy diversion current equalizer.
The present invention, which further designs, to be:
Be provided with perpendicular to airflow direction two groups of vertical and horizontal of the bidirectional guide current equalizer are used for vertical and horizontal tune Section enters the flue gas of electric precipitator.
The present invention is further designed and is also resided in:
The two-way real-time water conservancy diversion current equalizer of multi-region is equipped with blade assembly, driving unit and control unit in the system.
The present invention is further designed and is also resided in:
System configuration total electric field number m value 6 >=m >=4, high frequency electric source quantity >=1, the pulse power >=2.
The present invention is further designed and is also resided in:
When electric precipitator total electric field number is six, first four electric field is powered using high frequency electric source, latter two electric field is using pulse electricity Source power supply.
The present invention is further designed and is also resided in:
Two-way multi-region water conservancy diversion current equalizer is respectively set in electric precipitation entrance reducer multizone, distinguishes water conservancy diversion for multizone and flows Control.
The present invention is further designed and is also resided in:
The system is additionally provided with top control module, with the real-time current sharing control module of two-way multi-region, the height connecting respectively with top control module Frequency control module and pulse control module, wherein two-way current sharing control module, for adjusting bidirectional guide current equalizer blade Aperture, top control module can match collaboration and call each sub-module to realize to system according to different input conditions and duty parameter Optimization adjustment.
The present invention has the advantages that compared to present technology
1, the traditional electric precipitation of present invention breakthrough traps fine dust in flue gas difficult, easily because rapping is escaped, and tradition upgrading By the series technique warp of many restrictions such as place space, basic carrying, equipment investment, system resistance, operation energy consumption, blowing out duration The bottleneck that helps limits.
2, innovative development of the present invention high frequency+pulse subarea management control energy saving and efficiency increasing technology, preceding electric field compartment use high frequency Power supply economical and efficient removes 2.5 μm or more thick dust particles, and rear electric field compartment is using pulse power emphasis economical and efficient removing 2.5 μm or less particle dust, breach the technical bottleneck that existing dry electric precipitation is difficult to economical and efficient trapping fine solid particle, and it is simultaneous An investment economy and the place limitation of technological transformation project are cared for, electric precipitator outlet soot emissions energy-saving mode, which can be stablized, to be lower than 10mg/m3, high effective model can be lower than 5mg/m3.Solve the problems, such as that energy consumption is high when controlling only with high frequency electric source.
3, the Microsecond grade pulse power can be used in the present invention, exports microsecond based on DC power supply unit in a manner of resonant transformation Grade superimposed pulse voltage, strengthen fine grained it is charged and intervene generate plasma play the role of coalescence to fine grained, efficiently solve Fine grained easily escapes and is not easy the technical problem of charged trapping.It ensure that the concentration of electric charges of the instantaneous superelevation of electric field.It greatly improves Fine grain charge capacity.
4, of the invention add in deduster entrance reducer can real-time online adjustment and homogenizing deduster inside smoke flow field Two-way multizone water conservancy diversion current equalizer, the blade for being arranged in deduster reducer section each region can individually control with subregion With adjustment aperture, section flue gas flow field can longitudinal and transverse two-way multizone adjust in real time, to flue gas operating condition change in real time homogenizing adjust Throttle field, effectively solves the problems, such as that the generally existing flow field of deduster is uneven, local velocity is too fast, the escape of fine grained flue dust, shows It writes and improves efficiency of dust collection.
5, the electric fields of rear end of the present invention two are using the pulse power for strengthening the charged coalescence of subparticle, and when rapping guarantees there is one A electric field puts into operation, and in addition adjusts final stage electric field shaking cycle, can prevent and treat subparticle escape.
6, the Microsecond grade pulse power can be used in the present invention, exports microsecond based on DC power supply unit in a manner of resonant transformation Grade superimposed pulse voltage, strengthen fine grained it is charged and intervene generate plasma play the role of coalescence to fine grained, efficiently solve Fine grained easily escapes and is not easy the technical problem of charged trapping and takes into account low energy consumption and economy.It ensure that the instantaneous superelevation of electric field Concentration of electric charges.Greatly improve fine grain charge capacity
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of the embodiment of the present invention one, and also make an abstract attached drawing.
Fig. 2 is two kinds of control model PM2.5Emission effect compares figure.
Fig. 3 is to control deduster concentration field test result figure only with high frequency electric source.
Fig. 4 is using high frequency+pulse dual power supply coupling control deduster concentration field test result figure.
Specific embodiment:
Embodiment one:
As shown in Figure 1, high frequency of the present invention, which couples fine particle with pulse point domain, is removed in depth system, dust pelletizing system uses two Room The electric field of front end 4 of six electric field structures, every room is powered using high frequency electric source, and 2, rear end electric field are powered using the pulse power.Dedusting Device entrance reducer adds bidirectional guide current equalizer.
Preceding electric field compartment removes 2.5 μm or more crude particle dusts using high frequency electric source emphasis economical and efficient;Rear end electric field is adopted With novel pulse power supply power supply, reinforced fine particle coalescence and charged trapping, emphasis economical and efficient remove 2.5 μm or less thin Grain dust, and effectively inhibit because of reentrainment of dust caused by rapping;Its entrance reducer of dedusting adds bidirectional guide current equalizer, can For on-line control and improve deduster section flow field;Entire dust pelletizing system is using a kind of multi-dimensional intelligent feedback that can be precisely controlled More control system.
The each electric field power supply of electric precipitator front end is using based on the ultra-thin material of the modified ultracrystallite of the element dopings such as B, Nb and crisp Property cold conditions compression molding, accurate solid-solution and aging heat treatment technique production iron core new type power supply with high frequency (the present embodiment using state electricity The HF-01 type high frequency electric source of Environmental Protection Technology Co., Ltd).
(the present embodiment is using Guo electricity Environmental Protection Technology Co., Ltd using Microsecond grade high-voltage pulse power source for the power supply of rear end electric field HFPPS-01 high-voltage pulse power source) for its iron core using based on the modified ultracrystallite material of the element dopings such as B, Nb, production uses brittleness The ultra-thin molding of cold conditions molding and precisely solid-solution and aging heat treatment technique, and DC pulse superposition type controlled resonant converter frequency modulation is intervened, The concussion period may be implemented lower than 75 microseconds, even lower than 30 microseconds, which uses bipolar power supply, can produce positive negative electricity Son promotes and enhances fine particle coalescence and strengthens trapping.
Its entrance reducer of deduster adds one kind can be with leaf water conservancy diversion current equalizer (the present embodiment use of on-line control No. 201620689154.0, flue gas water conservancy diversion current equalizer), deduster section flue gas flow field can longitudinal and transverse two-way multiple regions difference Adjusting in real time, to adjust flow field with real-time be homogenized of flue gas operating condition variation, the generally existing flow field unevenness of effective solution deduster, The problem of local velocity is too fast, fine grained flue dust is escaped, significantly improves efficiency of dust collection.Setting is longitudinal and transverse double perpendicular to airflow direction It is flowed to multizone and adjusts component, it can be achieved that the flue gas online dynamic regulation of two-way flue gas in length and breadth, improves deduster section flow field.
The present invention establishes matching high frequency+pulse-couple control mode, in combination with coal-fired ash content characteristic and the practical feelings of unit Condition determines the optimal economic match pattern of two kinds of power supplys of high frequency and pulse.
The present invention has a characteristic that
(1) electric field of electric precipitator front end four uses the height based on the modified ultracrystallite ultra-thin materials iron core of the element dopings such as boron, niobium Frequency power, emphasis traps 2.5 μm of most crude particle or more dust, and most latter two electric field is using based on elements such as boron, niobiums The Microsecond grade pulse power of doping vario-property ultracrystallite ultra-thin materials iron core, to trap the fine solid particle escaped from front, and most At least ensure that an electric field is being run when latter two electric field rapping, to prevent from causing fine solid particle to be escaped because of rapping reason.
When total electric field number is m, the electric field number of pulse power source control rear end is 1) n(is more than or equal to, then front end high frequency electric source The electric field number that control electric field number is controlled with backend pulse power supply optionally determines that Matching band potential electrical field series is defeated according to electric precipitator Enter condition combination electrostatic precipitator structure feature to determine, influence factor has exhaust gas volumn, cross dimensions, fire coal and ash characteristics, each room The factors such as air flow method situation.
(2) dust catcher chamber's number is comprehensive according to unit and treatment quantity scale combination field determines, general 1-4 dedusting Device, the configuration total electric field number m (6 >=m >=4 under normal circumstances) of each dirt pocket, deduster section flue gas flow rate (v) 0.5- 1.5m/s considers to determine with specific reference to combined factors such as coal, the type of furnace, places.Dust Characteristics and Inlet dust concentration Cin, outlet Dust concentration CoutFor 0-30mg/m3
(3) at least ensured that an electric field is being in non-rapping state when most latter two electric field rapping, to prevent because of rapping Reason causes fine solid particle to be escaped.
(4) high frequency+pulse field domain power supply couples optimal economic allocation models:
Impulse electric field number n=3 × 10-11ρξ(n calculated result rounds up, and as n < 0.5,0) n takes
ε --- dispensing index, 0.5~1
Cout--- outlet dust concentration, mg/m3
ξ --- compound correction factor, Ω-1·s-1
Cin--- Inlet dust concentration, g/m3
A --- electric precipitator specific dust collection area, m2/m3/s
V --- flue gas flow rate, m/s
ρ --- dust specific resistance, Ω m
(5) the plasma discharge effect of the pulse power agglomerates PM to fine particle2.5Particle diameter distribution ratio improve, PM2.5Removing Rate 50-90%.
(6) high-frequency electric field quantity l=total electric field number m- impulse electric field number n.
Application example one:
Certain 1000MW unit, body of deduster are four Room, six electric field, section flue gas flow rate (v) 1.2m/s, import dust concentration 13357mg/m3, outlet dust concentration requirement is no more than 10mg/m3, dust specific resistance.Deduster entrance is provided with can real-time online The two-way multizone water conservancy diversion current equalizer of adjustment and homogenizing deduster inside smoke flow field, according to high frequency+pulse field domain power supply coupling Close optimal economic allocation models.Four electric field of every room electric precipitator front end is charged using high frequency electric source, and emphasis traps most of dust. The electric field of rear end two is charged using the Microsecond grade pulse power, to trap the fine solid particle escaped from front, and most latter two electricity At least ensure that an electric field is being run when the rapping of field, to prevent from causing fine solid particle to be escaped because of rapping reason.
Application example two: certain 330MW unit high frequency+pulse divides domain to couple demonstrative project
Certain power plant #1 unit uses four electric field electric precipitator of dual chamber.Every 2043382 m of furnace Design of Electrostatic Precipitator exhaust gas volumn of original3/ H, design efficiency 99.7%, house outlet concentration of emission guarantee value≤50mg/m3, electric precipitator high voltage system is power frequency Electric supply system.
In order to realize energy-saving and emission-reduction synergy, electric precipitator is transformed in power plant.Improvement project is that former electricity is being kept to remove The bases such as dirt device ontology are transformed #1 unit electric dust-removing power supply, improve control system, reduce deduster consumption rate, improve Electric precipitation efficiency of dust collection.By former the first, second electric field of electric precipitator power frequency supply be changed to high frequency electric source power supply, and by third, Four electric field power supplies are changed to pulse power power supply, further increase ESP Efficiency.
Carry out both of which fine particle emission reduction effect experimental study under 299MW loading condiction, the results showed that, it uses High frequency+pulse mode compares the pure high frequency mode of tradition under close input condition, ESP outlet PM after transformation2.5Concentration of emission from 8.89 mg/m3Drop to 3.03 mg/m3, reduce 65.9%.PM under two kinds of control models2.5Emission effect is as shown in Figure 2.
Application example two: certain five electric field Applied D emonstration of 350MW dual chamber
All using concentration of emission under high frequency electric source energy-saving mode before five electric field Retrofit on electrostatic precipitator of certain power plant 350MW unit 23.7-27.9mg/m3, it is unsatisfactory for the special emission limit 20mg/m required at that time3It is required that when transformation, beside former high frequency electric source It is additionally arranged set of pulses power supply respectively, has carried out both of which power supply matching correct, two kinds of power supplys matching controls when super electricity saving mode Operating condition compares under the conditions of system:
Situation (1): 1,2,3,4 electric field of front end uses high frequency electric source, and 5 electric fields use the pulse power;
Situation (2): 1,2,3 electric field of front end uses high frequency electric source, and 4,5 electric fields use the pulse power;
It can be seen that two kinds of power supply coupling dust removing effects are obviously improved, it is superior to pure high frequency electric source power supply, meets special emission limit 20mg/m3It is required that the relatively former design economize on electricity 19.4% of situation (1).And situation (1) is changing into situation (2), ESP outlet soot emissions Concentration is from 15.6 mg/m3Drop to 13.4 mg/m3, economize on electricity 4.3% on the basis of situation (2) relative case (1);
Application example three: certain 1000MW Applied D emonstration
By taking the ultralow six electric field Retrofit on electrostatic precipitator of demonstration subitem of certain power plant 1000MW unit as an example, Fig. 3 is that transformation is preceding only with height Frequency power controls deduster concentration field test result figure.Fig. 4 is that two-way multizone water conservancy diversion current equalizer is arranged and uses high frequency+arteries and veins Rush dual power supply coupling control deduster concentration field experimental test result figure.
Deduster entrance be provided with the present invention can real-time online adjustment and homogenizing deduster inside smoke flow field it is two-way more Region water conservancy diversion current equalizer, using high frequency+pulse dual power supply coupled configuration, the electric field of front end 4 is powered using high frequency electric source, rear end 2, electric field are powered using the pulse power.
Under same entry condition, total particulate concentration is exported from 15.4mg/m3Drop to 4.8 mg/m3, meet particulate matter Minimum discharge 10mg/m3Limit value requirement, flow field velocity deviation drop to 8.3% from 17.9%, and flow field uniformity is obviously improved.
The 1000MW dedusting channel difference control model, testing experiment compare the test point of single channel deduster test concentrations field Cloth situation See Figure 3, Fig. 4, PM2.5Removal efficiency 21.4% is promoted to 76.3%.

Claims (7)

1. a kind of high frequency couples fine particle with pulse point domain and system is removed in depth, electric precipitator at least configures three in the system Grade electric field, it is characterised in that: the preceding electric field of electric precipitator is powered using high frequency electric source, and rear electric field is powered using the pulse power, and And bidirectional guide current equalizer is equipped in electric precipitation entrance reducer.
2. high frequency couples fine particle with pulse point domain and system is removed in depth according to claim 1, it is characterised in that: institute Two groups of vertical and horizontal that bidirectional guide current equalizer is provided with perpendicular to airflow direction are stated, adjusts and enters for vertical and horizontal The flue gas of electric precipitator.
3. high frequency couples fine particle with pulse point domain and system is removed in depth according to claim 2: two-way in the system Multi-region water conservancy diversion current equalizer is equipped with blade assembly, driving unit and control unit.
4. -3 any high frequencies couple fine particle with pulse point domain and system, feature are removed in depth according to claim 1 It is: system configuration total electric field number m value 6 >=m >=4, high frequency electric source quantity >=1, the pulse power >=2.
5. high frequency couples fine particle with pulse point domain and system is removed in depth according to claim 4, it is characterised in that: electricity When deduster total electric field number is six, first four electric field is powered using high frequency electric source, latter two electric field is powered using the pulse power.
6. high frequency couples fine particle with pulse point domain and system is removed in depth according to claim 4, it is characterised in that: electricity Bidirectional guide current equalizer is respectively set in dedusting entrance reducer multizone, is used for multizone water conservancy diversion sharing control.
7. high frequency couples fine particle with pulse point domain and system is removed in depth according to claim 4, it is characterised in that: should System is additionally provided with top control module, with connect respectively with top control module two-way multi-region current sharing control module, high frequency control module And pulse control module, wherein two-way current sharing control module, for adjusting the aperture of bidirectional guide current equalizer blade.
CN201811240543.5A 2018-10-23 2018-10-23 High frequency couples fine particle with pulse point domain and system is removed in depth Pending CN109127144A (en)

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Cited By (3)

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CN109847937A (en) * 2019-03-04 2019-06-07 佛山华碳环境科技有限公司 A kind of electric precipitation defogging method
WO2020216368A1 (en) * 2019-04-25 2020-10-29 上海必修福企业管理有限公司 Apparatus and method for treating vocs gas
CN117380394A (en) * 2023-12-08 2024-01-12 国家能源集团科学技术研究院有限公司 Ultra-clean electric dust collector with pulse power supply and high-frequency power supply coupled with partition

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