CN100393389C - Method for changing electrostatic precipitator in coal-fired power plant to bag type dust catcher - Google Patents
Method for changing electrostatic precipitator in coal-fired power plant to bag type dust catcher Download PDFInfo
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- CN100393389C CN100393389C CNB2005100403323A CN200510040332A CN100393389C CN 100393389 C CN100393389 C CN 100393389C CN B2005100403323 A CNB2005100403323 A CN B2005100403323A CN 200510040332 A CN200510040332 A CN 200510040332A CN 100393389 C CN100393389 C CN 100393389C
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Abstract
The present invention relates to a method for changing an electrostatic dust catcher in a coal-fired power plant to a bag type dust catcher, which comprises the following steps: a, dismantling an anodic plate, cathode rays, etc. in a casing of the original electrostatic dust catcher; installing a pattern board of the bag type dust catcher on the upper end in the casing; installing a plurality of filter bags on the pattern board; taking a reserved ash bucket as a lower box body; b, reforming an outlet fume box of the original dust catcher, namely sealing a fume outlet of the original air-out fume box on the casing, and installing an air-out fume box in the position above the pattern board of the same side of the original fume outlet of the casing to form the end out of the fume; c, reforming an inlet fume box of the original dust catcher, namely installing at least a layer of air flow distribution board in the inlet fume box to make the end out and end in of the boiler fume; d, additionally installing a precoating ash system on a flue of the fume inlet of the inlet fume box; e, installing a blowing system in a clean box of the casing. The present invention has the advantages that the handling capacity of each chamber is more homogeneous, the adaptive inlet dust concentration range is big, the service life of the filter bag is long and the dust removing effect is high.
Description
Relate to the field
The invention belongs to coal-burning power plant's cleaner, relate to the method that original electrostatic precipitator is changed into sack cleaner.
Background technology
Current, what Chinese most coal fired thermal power plant boilers adopted all is electrostatic precipitator.Issuing and implementation along with new national environmental standard, emission control (as dust emission concentration, SO2 discharging etc.) to the coal-fired plant boiler atmosphere pollution is had higher requirement, many for this reason power plant begin to use low-sulfur coal or take the desulfurization measure, this just makes that the ratio resistance of dust changes in the flue gas, exceeded the optimum scope of electrostatic precipitator, cause the dust-collecting efficiency of electrostatic precipitator to descend, can not satisfy present discharge standard.In the present cleaner, the most reliable what can satisfy discharge standard is exactly sack cleaner.Sack cleaner belongs to high-effective dust-removing equipment, and efficiency of dust collection is not subjected to the influence of dust characteristic, and sack cleaner is at filtrate, ash-clearing technology, technology such as control has all had significant progress automatically in recent years.Coal-fired plant boiler in many developed countries such as Australia adopts sack cleaner more and more, can say for certain that sack cleaner has broad application prospects in the coal-burning power plant, but it is because domestic in the commerical test that begins successively in several small-sized station boilers, to carry out sack cleaner at the bottom of the seventies, because the religion of the integral level of sack cleaner at that time falls behind, the equipment and material and the operation control technology that lack dependable performance, finally do not succeed, so sack cleaner is not applied at most coal fired thermal power plants of China.
Summary of the invention
The present invention seeks to provides a kind of electrostatic precipitator that does not reach emission request that coal-fired plant boiler is used now to change sack cleaner into for the above-mentioned defective that solves prior art, changes the method for sack cleaner into the electrostatic precipitator in coal-fired power plant that satisfies more and more stricter atmosphere pollutants emission standards.
Purpose of the present invention also can realize by following technical solution
Electrostatic precipitator in coal-fired power plant changes the method for sack cleaner into, and it includes following steps:
A. remove positive plate, cathode line, erecting by overhang and all rapping apparatus of former electrostatic precipitator enclosure interior; Be provided with the card of sack cleaner in the upper end of enclosure interior, hang a plurality of filter bags on card, filter bag supports with the bag cage, and each filter bag bag cage forms the filter chamber; Housing is the boundary with the card, is upper box for clean casing above the card, is the promptly middle casing in filter chamber below the card; The ash bucket that keeps is as lower box.
B. the outlet smoke box of former deduster is transformed, remove former smoke box and the flute profile baffle plate of giving vent to anger, the outlet flue of the former smoke box of giving vent to anger on the closure casing, the clean box location of the homonymy of former outlet flue place is provided with the smoke box of giving vent to anger on housing, the smoke box of giving vent to anger is communicated with clean casing, forms bringing out of flue gas;
C. the import smoke box of former deduster is transformed, be provided with one deck airflow-distribution board at least in the import smoke box, the direction that makes boiler smoke enter the import smoke box is consistent with the direction of leaving the outlet smoke box, is straight direction, and boiler smoke forms the end inlet side and goes out;
D. set up the precoating ash system at the flue place, gas approach position of import smoke box,
E. in the clean case of housing, injection system is set, adopts compressed air filter-bag blowing line by line.
Purpose of the present invention also can further realize by following technology solution:
Aforesaid electrostatic precipitator in coal-fired power plant changes the method for sack cleaner into, wherein said in the import smoke box described in the step c airflow-distribution board be provided with in the face of the air current flow direction and with the air current flow direction is vertical for positive, airflow-distribution board is provided with airflow hole, is positioned at center position that air communication the crosses blind plate district for not perforate on airflow-distribution board.In the import smoke box along airflow direction in the back of airflow-distribution board the parallel airflow uniform distribution plate that is provided with, evenly open air-flow distribution hole on the described airflow uniform distribution plate.
Aforesaid electrostatic precipitator in coal-fired power plant changes the method for sack cleaner into, wherein be linked with spoiler vertically downward at the adjacent of each filter chamber in clean casing described in the step a, the height of each spoiler successively decreases in regular turn according to airflow direction, the line of each spoiler forms a wedge shape discharge pipe, and this discharge pipe is communicated with the outlet smoke box.
The invention has the advantages that each chamber treating capacity is more even, running resistance is low; The inlet dust content scope that adapts to is big; Life of bag filter is long, and is stable, simple to operate; The efficiency of dust collection height exports dust emission concentration＜30mg/Nm generally speaking
3, satisfy the requirement of country and local dust emission standard fully; The automatization level height; Operation is simple, maintenance cost is low.
Purpose of the present invention, advantage and characteristics will illustrate and explain that these embodiment only provide as an example with reference to accompanying drawing by the non-sex-limited explanation of following preferential embodiment.
Description of drawings
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is a cross-sectional view of the present invention.
Fig. 3 is an airflow-distribution board structural representation of the present invention.
The specific embodiment
As shown in Figure 1-Figure 3, the present invention operates by following step: deduster housing (1) is transformed
Remove the high voltage isolator at top; Remove positive plate, cathode line, erecting by overhang, the rapping apparatus of electric cleaner inside, remove electric motor of shaker, cable and crane span structure, platform and the insulation etc. of electric cleaner outside; Press the designing requirement of sack cleaner then and transform housing, sack cleaner relevant devices and member are installed.Filter bag 1 is the core component of sack cleaner, so the selection of filtrate just becomes the key that can transformation successful, according to each coal-fired plant flue gas characteristic, optimizes and chooses suitable filtrate, reduces running resistance, increases the service life, and reduces operation and maintenance cost.(as using an overhaul life), be provided with the card of sack cleaner in the upper end of enclosure interior, on card, be provided with a plurality of filter bags 1, filter bag 1 supports with the bag cage, and each filter bag bag cage forms filter chamber; Housing is the boundary with the card, is upper box 3 for clean casing above the card, is the promptly middle casing 4 in filter chamber below the card; The ash bucket 19 that keeps is as lower box 5.The adjacent of each filter chamber is linked with spoiler 6 vertically downward in clean casing 3, and the height of each spoiler 6 successively decreases in regular turn according to airflow direction, and the line of each spoiler forms a wedge shape discharge pipe; For reducing the resistance of sack cleaner, and make air current composition reasonable, help prolonging the service life of filter bag, improve the deduster reliability of operation,, determine that the use side inlet side goes out form according to fluid mechanics principle and through the air current composition simulated test; And airflow-distribution board 9 and air-flow uniform board 10 be set in import smoke box 8.
Remove the original smoke box of giving vent to anger of electric cleaner, redesign outlet smoke box 11; Simultaneously also must carry out part and remove and transform importing and exporting flue because of the setting of the transformation of air-introduced machine and valve.Outlet smoke box to former deduster is transformed, remove former smoke box and the flute profile baffle plate of giving vent to anger, the outlet flue of the former smoke box of giving vent to anger on the closure casing, the clean box location of the homonymy of former outlet flue place is provided with the smoke box of giving vent to anger on housing, the feasible smoke box 11 of giving vent to anger of the discharge pipe of clean casing 3 is communicated with clean casing, forms bringing out of flue gas; Import smoke box 3 to former deduster is transformed, and is provided with one deck airflow-distribution board 9 in the import smoke box at least, and the direction that makes boiler smoke enter the import smoke box is consistent with the direction of leaving the outlet smoke box, is straight direction, and boiler smoke forms the end inlet side and goes out; Airflow-distribution board is provided with in the face of the air current flow direction and with the air current flow direction is vertical for positive in the described import smoke box, and airflow-distribution board is provided with airflow hole 12.The described blind plate district 13 that on airflow-distribution board, is positioned at center position that air communication crosses for not perforate.In the import smoke box along airflow direction in the back of airflow-distribution board the parallel airflow uniform distribution plate 10 that is provided with, evenly open air-flow distribution hole on the described airflow uniform distribution plate 10.Flue 21 places set up precoating ash system 14 in the gas approach position of import smoke box 3, and the coal-burning power plant needs oil spout combustion-supporting under special circumstances, contains mist of oil in the flue gas, for avoiding sticking bag, need before the ignition of the boiler fuel oil filter bag surface precoating flyash.In the clean casing of housing injection system is set, injection system comprises gas bag 15, pulse valve 16, jet pipe 17 and nozzle 18, adopts compressed air filter-bag blowing line by line, and the dust of filter bag is trembled in the ash bucket 19.The pulse dust cleaning of sack cleaner mainly sprays into filter bag by the air that compressed air is managed inducing peripheral by jetting in the extremely short time, make filter bag produce the pulse expansion and vibrate, and the dust on the filter bag is gone into ash bucket by flake-off.The pulse dust cleaning of sack cleaner needs the compressed air of 0.3～0.5MPa, requires compressed air to remove water treatment through oil removing, so should newly-built air compressor air feed and cleaning system.
In addition, also need boiler induced-draft fan 20 is carried out supporting transformation.After electric cleaner changed sack cleaner into, the running resistance of its deduster will increase about 1500Pa, so the air-introduced machine and the motor of being joined thereof also must be done corresponding transformation or replacing.The total head of air-introduced machine should be able to satisfy the extra pressure loss of bag-type dust removing system, guarantees the normal operation of boiler.In addition, corresponding transformation also should be carried out in air-introduced machine, motor basis.
Also need improvement and design is carried out in electrical control and electric supply installation.The sack cleaner body does not need power supply, therefore the electric supply installation of power supply of the negative electrode of former electric cleaner and anode vibrated system also just become unnecessary; And the control of the blowback pulse dust cleaning of sack cleaner is different from the vibration dust-cleaning control of electric cleaner, therefore to remove original power supply and control device and corresponding cable testing bridge thereof, according to the requirement of sack cleaner, design new power supply and control device and relevant auxiliary facilities thereof (illumination, maintenance, cable and cable testing bridge etc.).Parameter monitoring when new electric autocontrol system should comprise boiler operatiopn and abnormal conditions are reported to the police, for operating condition and the accident alarming of grasping boiler, parameter (temperature, pressure, oxygen content etc.) to sack cleaner all has automatic monitoring and automatic control system, abnormal conditions (as superhigh temperature, oxygen content exceed standard, resistance exceeds standard etc.) report to the police.
Simultaneously to the supporting transformation of carrying out of ash-transmission system: each electric field efficiency of dust collection of former electrostatic precipitator is about 75-80%, each electric field ash amount differs bigger, major part concentrates on an electric field (when an electric field has fault, concentrating on one, two electric fields), and rear portion electric field ash amount is less; After changing sack cleaner into, each chamber (corresponding former each electric field) smoke treatment amount is more even, and ash amount deviation is little, therefore need transform ash disposal system, examine unloading valve and, adjust control program towards the disposal ability of gray water tank (waterpower ash discharge) or storehouse pump (strength ash discharge).
In addition according to user's actual conditions and requirement, selectively dispose urgent mist cooling system, by-pass flue etc.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (7)
1. electrostatic precipitator in coal-fired power plant changes the method for sack cleaner into, and it includes following steps:
A. remove positive plate, cathode line, erecting by overhang and all rapping apparatus of former electrostatic precipitator enclosure interior; Be provided with the card of sack cleaner in the upper end of enclosure interior, be provided with a plurality of filter bags on card, filter bag supports with the bag cage, and each filter bag bag cage forms the filter chamber; Housing is the boundary with the card, is upper box for clean casing above the card, is the promptly middle casing in filter chamber below the card; The ash bucket that keeps is as lower box;
B. the outlet smoke box of former deduster is transformed, remove former smoke box and the flute profile baffle plate of giving vent to anger, the outlet flue of the former smoke box of giving vent to anger on the closure casing, the clean cavity of the homonymy of former outlet flue position is provided with the smoke box of giving vent to anger on housing, the smoke box of giving vent to anger is communicated with clean casing, forms bringing out of flue gas;
C. the import smoke box of former deduster is transformed, be provided with one deck airflow-distribution board at least in the import smoke box, the direction that makes boiler smoke enter the import smoke box is consistent with the direction of leaving the outlet smoke box, is straight direction, and boiler smoke forms the end inlet side and goes out;
D. set up the precoating ash system at the flue place, gas approach position of import smoke box;
E. in the clean case of housing, injection system is set, adopts compressed air filter-bag blowing line by line.
2. electrostatic precipitator in coal-fired power plant according to claim 1 changes the method for sack cleaner into, it is characterized in that airflow-distribution board is provided with in the face of the air current flow direction and with the air current flow direction is vertical for positive in the import smoke box described in the step c, airflow-distribution board is provided with airflow hole.
3. electrostatic precipitator in coal-fired power plant according to claim 1 changes the method for sack cleaner into, it is characterized in that being positioned at center position that air communication the crosses blind plate district for not perforate described in the step c on airflow-distribution board.
4. electrostatic precipitator in coal-fired power plant according to claim 1 changes the method for sack cleaner into, it is characterized in that in step c, in the import smoke box along airflow direction in the back of airflow-distribution board the parallel airflow uniform distribution plate that is provided with, evenly open air-flow distribution hole on the described airflow uniform distribution plate.
5. electrostatic precipitator in coal-fired power plant according to claim 1 changes the method for sack cleaner into, it is characterized in that being linked with spoiler vertically downward at the adjacent of each filter chamber in clean casing described in the step a, the height of each spoiler successively decreases in regular turn according to airflow direction, the line of each spoiler forms a wedge shape discharge pipe, and this discharge pipe is communicated with the outlet smoke box.
6. electrostatic precipitator in coal-fired power plant according to claim 1 changes the method for sack cleaner into, it is characterized in that the precoating ash system described in the d step for offering precoating ash charge door at the correct position of gas approach, by grey tank car or spray ash system automatically and in flue, spray into flyash when the fuel oil.
7. electrostatic precipitator in coal-fired power plant according to claim 1 changes the method for sack cleaner into, it is characterized in that the injection system in the e step comprises gas bag, pulse valve, jet pipe and nozzle.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100403323A CN100393389C (en) | 2005-05-31 | 2005-05-31 | Method for changing electrostatic precipitator in coal-fired power plant to bag type dust catcher |
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| CNB2005100403323A CN100393389C (en) | 2005-05-31 | 2005-05-31 | Method for changing electrostatic precipitator in coal-fired power plant to bag type dust catcher |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102198426B (en) * | 2011-03-31 | 2013-05-08 | 合肥水泥研究设计院 | Multiple combined apparatus for air flow distribution board of electrostatic precipitator |
| CN102274793A (en) * | 2011-05-11 | 2011-12-14 | 中冶南方工程技术有限公司 | Electrostatic precipitator with additional anion generators |
| CN102829475A (en) * | 2012-09-18 | 2012-12-19 | 辽宁调兵山煤矸石发电有限责任公司 | Dust-precoating device and method for dust remover of boiler |
| CN103341294B (en) * | 2013-06-26 | 2015-01-28 | 中国石油大学(北京) | High-temperature gas filter device and filtering method thereof |
| CN105194947A (en) * | 2015-10-23 | 2015-12-30 | 苏州宇洋环保设备制造有限公司 | Electricity-to-bag dust collector |
| CN105912745A (en) * | 2016-03-24 | 2016-08-31 | 安徽威达环保科技股份有限公司 | Bag dust filter air distribution multi-parameter optimization method |
| CN106914092A (en) * | 2017-05-05 | 2017-07-04 | 洁华控股股份有限公司 | A kind of stepped electricity changes bag dust collector structure |
| CN107413159A (en) * | 2017-09-22 | 2017-12-01 | 华北电力大学 | A kind of electrostatic fabric filter for integrating energy-saving desulfuration dedusting |
| CN107812417A (en) * | 2017-09-30 | 2018-03-20 | 大唐东北电力试验研究所有限公司 | Thermal generation unit Retrofit on electrostatic precipitator method |
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| CN2561488Y (en) * | 2002-08-19 | 2003-07-23 | 姜凤有 | Large impulse bag dust collector with ash bucket as dust collecting storage |
| CN1537665A (en) * | 2003-04-15 | 2004-10-20 | 沈继平 | Rotary pulse bag type dust collector |
| JP2005028294A (en) * | 2003-07-04 | 2005-02-03 | Kurita Water Ind Ltd | Flue gas treatment method |
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2005
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11244634A (en) * | 1998-03-03 | 1999-09-14 | Nippon Spindle Mfg Co Ltd | Bag filter type dust collector |
| CN2561488Y (en) * | 2002-08-19 | 2003-07-23 | 姜凤有 | Large impulse bag dust collector with ash bucket as dust collecting storage |
| CN1537665A (en) * | 2003-04-15 | 2004-10-20 | 沈继平 | Rotary pulse bag type dust collector |
| JP2005028294A (en) * | 2003-07-04 | 2005-02-03 | Kurita Water Ind Ltd | Flue gas treatment method |
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| CN1872385A (en) | 2006-12-06 |
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Owner name: GUODIAN SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Free format text: FORMER OWNER: GUODIAN ENVIRONMENT PROTECTION INST. Effective date: 20100716 |
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Effective date of registration: 20100716 Address after: 210031 Pudong Road, Pukou District, Jiangsu, No. 10, No. Patentee after: Guodian Science and Technology Research Institute Address before: 210031 Pudong Road, Pukou District, Jiangsu, No. 10, No. Patentee before: Guodian Environment Protection Inst. |