CN105107629A - Specific resistance conditioning agent used for lowering fly ash resistivity and application of specific resistance conditioning agent - Google Patents
Specific resistance conditioning agent used for lowering fly ash resistivity and application of specific resistance conditioning agent Download PDFInfo
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- CN105107629A CN105107629A CN201510596639.5A CN201510596639A CN105107629A CN 105107629 A CN105107629 A CN 105107629A CN 201510596639 A CN201510596639 A CN 201510596639A CN 105107629 A CN105107629 A CN 105107629A
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- conditioning agent
- ratio resistance
- resistance conditioning
- fly ash
- specific resistance
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Abstract
The invention discloses a specific resistance conditioning agent used for lowering fly ash resistivity. The specific resistance conditioning agent is an aqueous solution containing alkali metal salt; the alkali metal salt comprises sodium acetate and dipotassium phosphate. The invention discloses the application and a using method of the specific resistance conditioning agent. By means of the specific resistance conditioning agent, the specific resistance of fly ash can be effectively reduced, and the removal efficiency over the fly ash of an electrostatic dust collector is improved.
Description
Technical field
The invention belongs to energy and environment field, relate to a kind of ratio resistance conditioning agent, more specifically, relate to a kind of ratio resistance conditioning agent for reducing fly ash resistivity.The invention still further relates to the application of this ratio resistance conditioning agent.
Background technology
Electrostatic precipitator is more and more extensive in the application of power industry.This is because electrostatic precipitator utilizes highfield to make gas ionization, namely corona discharge is produced, and then make dust charged, and under the effect of electric field force, the dust arrester that dust is separated from gas, electrostatic precipitator comparatively other dedusting method has many good qualities: can process large discharge gas and high temperature or corrosive gas; Coulomb force directly acts on the particle swum in gas, and equipment mechanism is simple, air velocity is low, therefore the deduster pressure loss is little, and dust collector efficiency is high, can reach more than 99%, simultaneously high temperature resistant; The series of advantages such as operation and maintenance cost is low.General dust specific resistance is 10
4-10
10be most appropriate to time within the scope of Ω cm electrically gather dust, and in power industry is produced, often run into ratio resistance higher than 5 × 10
10the dust of Ω cm and high resistivity dust, so the problem of gathering dust solving high specific resistance has and great meaning for raising electrostatic precipitator efficiency of dust collection.
According to present Research both domestic and external and part power plant operative practice, setting up flue gas quality regulating system to improve electrostatic precipitator to the adaptability of fire coal with improve efficiency of dust collection further to electric dust removing system, is the effective and promising approach of one solving dust emission problem.Wherein, the performance of ratio resistance conditioning agent plays again conclusive effect.The modified technology be most widely used at present is S0
3modified, S0
3modified principle is by a small amount of controllable S0
3be ejected in the middle of flue gas, S0
3acid mist is adsorbed on flying dust, forms an adsorption layer, reduce ratio resistance by surface conductance on the surface of flying dust, makes dust more easily collecting, thus improves efficiency of dust collection.Although this technology develops comparatively perfect comparatively speaking, application is comparatively general, still there are some problems, shows the following aspects: (1) S0
3generation sulfuric acid vapor can be combined by steam in flue gas, thus corrosion is produced to electrostatic precipitator and flue; (2) part S0 is had
3by chimney discharged to air, atmospheric environment can be affected; (3) at S0
3in the operation and maintenance of flue gas conditioning device injector nozzle blocking corrosion be also one by question of common concern; (4) expensive, regular maintenance, operating cost are higher.Thus, develop a kind of safety, economical, environmental protection, efficient novel ratio resistance conditioning agent, for minimizing dust emission concentration, meeting constantly strict provisions of laws and regulations will be significant.
Summary of the invention
One of the object of the invention is to provide a kind of ratio resistance conditioning agent for reducing fly ash resistivity.This ratio resistance conditioning agent can reduce dust specific resistance, thus solution high resistivity dust affects problem to electrostatic precipitator efficiency of dust collection, and can not produce corrosion to electrostatic precipitator, flue and injector nozzle.
Object of the present invention is achieved through the following technical solutions: a kind of ratio resistance conditioning agent for reducing fly ash resistivity, and be the aqueous solution containing alkali metal salt, described alkali metal salt comprises sodium acetate and dipotassium hydrogen phosphate.
Containing alkali metal salt in ratio resistance conditioning agent provided by the invention, there is sodium, potassium alkali metal ions, according to flying dust electrical conduction mechanism, no matter be surface conductance or volume conduction process, alkali metal ion is all the main carriers of conducting process charge migration, and the ratio resistance height of flying dust is also often that alkali metal ion content measured is few or be difficult to the reason that discharges.Ratio resistance conditioning agent of the present invention is that flying dust additionally provides appropriate sodium potassium ion, enhances the electric conductivity of flying dust, reduces fly ash resistivity, make it reach the ratio resistance scope of the most applicable electrostatic precipitator work.
In the present invention, the addition of sodium acetate and dipotassium hydrogen phosphate can adjust according to flying ash in electric power plant character.As an embodiment of the invention, in solution, the mass percent of described sodium acetate is 0.001%-0.01%, and the mass percent of described dipotassium hydrogen phosphate is 0.001%-0.1%.Preferably, the mass percent of described sodium acetate is 0.005%-0.01%, and the mass percent of described dipotassium hydrogen phosphate is 0.01%-0.1%.
Further, described alkali metal salt also comprises lignin sodium carbonate, and this lignin sodium carbonate not only can provide sodium ion, also possess dispersiveness to a certain degree, can be adsorbed on ash surface, strengthen metal ion exchanged, promote the release of sodium potassium ion, more effectively reduce the ratio resistance of flying dust.The sodium carbonate of lignin described in the present invention mass percent is in the solution 0.001%-0.005%.
Two of object of the present invention is to provide the application of above-mentioned ratio resistance conditioning agent, and particularly, the application in high specific resistance flying dust removed by described ratio resistance conditioning agent in power plant's dedusting.
Three of object of the present invention is to provide the using method of above-mentioned ratio resistance conditioning agent in power plant's dedusting.Particularly, this using method is as follows: test flue gas and flying dust character and granular material discharged concentration and exhaust gas volumn, each amounts of components is regulated according to test result determination ratio resistance, in flue before electrostatic precipitator, ratio resistance conditioning agent is sprayed into 10-40 μm of particle diameter, described ratio resistance conditioning agent is adsorbed on fly ash granule, thus reduce the ratio resistance of flying dust, improve electrostatic precipitator to the removal efficiency of high specific resistance flying dust.The consumption of different unit ratio resistance conditioning agent is different, and the straying quatity of ratio resistance conditioning agent is relevant with boiler smoke tolerance, 10000m per hour
3needed for flue gas, the amount of conditioning agent is about 1t, now best results.
Of the present inventionly to have the following advantages:
(1) ratio resistance conditioning agent of the present invention effectively can reduce the ratio resistance of flying dust, improves electrostatic precipitator to its removal efficiency.
Sodium acetate and dipotassium hydrogen phosphate are that flying dust additionally provides appropriate sodium, potassium ion, enhance the electric conductivity of flying dust, reduce fly ash resistivity, make it reach the ratio resistance scope of the most applicable electrostatic precipitator work.When containing lignin sodium carbonate in ratio resistance conditioning agent further, lignin sodium carbonate not only can provide sodium ion, also there is dispersiveness to a certain degree, can be adsorbed on the surface of flying dust, strengthen metal ion exchanged, promote the release of sodium potassium ion, significantly can reduce the ratio resistance of flying dust, electrostatic precipitator in coal-fired power plant can be made to export dust concentration and to reduce about 30%, there is wide commercial promise.
(2) ratio resistance conditioning agent main component of the present invention is salts substances, effectively reduces conditioning agent to the corrosion of flue.
(3) ratio resistance conditioning agent raw material sources of the present invention are extensive, cheap, and chemical composition is simple, building-up process simple and fast, are applicable to commercial introduction.
(4) ratio resistance conditioning agent environmentally safe of the present invention, meets current environmental protection concept.
(5) because most of toxic heavy metal is all enriched on fine particle, the integration adopting ratio resistance conditioning agent of the present invention can also realize heavy metal removes.
Accompanying drawing explanation
Fig. 1 is ratio resistance conditioning agent using method FB(flow block) of the present invention.
Detailed description of the invention
The preparation method of ratio resistance conditioning agent of the present invention: add running water in the mixing container, then adds sodium acetate and dipotassium hydrogen phosphate under at the uniform velocity stirring, and after the two dissolves completely, adds lignin sodium carbonate, is then stirred to and dissolves completely.
Ratio resistance conditioning agent is pressed different component before combination and is independently stored, and also can be made into highly concentrated solution in proportion and store, and adds running water dilution during use in proportion.But the time should not be excessively of a specified duration, was advisable with one week.
For different power plant; different flue gas condition and burned-coal fly ash characteristic regulate the ratio of ratio resistance conditioning agent different component; determine ratio resistance conditioning agent consumption; arrange double-current atomizer in flue before deduster, ratio resistance conditioning agent is sprayed into 10-40 μm of particle diameter, reduce the ratio resistance of flying dust; improve deduster to the removal efficiency of high specific resistance flying dust; reduce smoke dust discharge concentration, reduce pollutant discharge of enterprise expense, environment protection.
To itemize embodiment below, in embodiment, percentage is mass percent.
embodiment 1
Sodium acetate 0.001%
Dipotassium hydrogen phosphate 0.001%
Lignin sodium carbonate 0.001%
All the other are water.
Test flue gas and flying dust character and granular material discharged concentration and exhaust gas volumn, regulate each amounts of components, as said ratio according to test result determination ratio resistance.This ratio resistance conditioning agent is sprayed in flue between air preheater and electrostatic precipitator, the droplet that ratio resistance conditioning agent is atomized into average grain diameter about 30 μm under the effect of fresh air sprays into flue, both interact in flue, the time of staying is about 10s, ratio resistance conditioning agent contacts with flying dust, merge, regulate ratio resistance, and then caught by follow-up electrostatic precipitator.Exit, electrostatic precipitator rear portion adopts isokinetic sampling's instrument to carry out Constant flow sample, measures particulate emission concentration.Result shows, after spraying into ratio resistance conditioning agent, after dust arrester, dust concentration is by 130.6mg/m when not spraying into ratio resistance conditioning agent
3be down to 90.8mg/m
3, reduction ratio reaches 30.5%.
embodiment 2
Sodium acetate 0.005%
Dipotassium hydrogen phosphate 0.005%
Lignin sodium carbonate 0.002%
All the other are water.
Test flue gas and flying dust character and granular material discharged concentration and exhaust gas volumn, regulate each amounts of components, as said ratio according to test result determination ratio resistance.Before electrostatic precipitator, by dosing pump, compressed air, double-current atomizer, ratio resistance conditioning agent is pressed 0.05Kg/Nm
3the flow of flue gas, sprays in vertical gas pass with the particle diameter of about 25 μm, and smoke dust discharge concentration is by original 38.8mg/Nm
3be reduced to 25.7mg/Nm
3, reduce about 33.8%, reach the granular material discharged standard in coal-burning power plant that country is up-to-date.
embodiment 3
Sodium acetate 0.007%
Dipotassium hydrogen phosphate 0.007%
Lignin sodium carbonate 0.005%
All the other are water.
embodiment 4
Sodium acetate 0.01%
Dipotassium hydrogen phosphate 0.1%
Lignin sodium carbonate 0.005%
All the other are water.
embodiment 5
Sodium acetate 0.003%
Dipotassium hydrogen phosphate 0.003%
Lignin sodium carbonate 0.002%
All the other are water.
embodiment 6
Sodium acetate 0.007%
Dipotassium hydrogen phosphate 0.05%
Lignin sodium carbonate 0.005%
All the other are water.
embodiment 7
Sodium acetate 0.01%
Dipotassium hydrogen phosphate 0.01%
Lignin sodium carbonate 0.003%
All the other are water.
Claims (8)
1. for reducing a ratio resistance conditioning agent for fly ash resistivity, it is characterized in that, described ratio resistance conditioning agent is the aqueous solution containing alkali metal salt, and described alkali metal salt comprises sodium acetate and dipotassium hydrogen phosphate.
2. the ratio resistance conditioning agent for reducing fly ash resistivity according to claim 1, is characterized in that, the mass percent concentration of described sodium acetate is 0.001%-0.01%, and the mass percent concentration of described dipotassium hydrogen phosphate is 0.001%-0.1%.
3. the ratio resistance conditioning agent for reducing fly ash resistivity according to claim 1, is characterized in that, the mass percent concentration of described sodium acetate is 0.005%-0.01%, and the mass percent concentration of described dipotassium hydrogen phosphate is 0.01%-0.1%.
4. the ratio resistance conditioning agent for reducing fly ash resistivity according to any one of claim 1-3, it is characterized in that, described alkali metal salt also comprises lignin sodium carbonate.
5. the ratio resistance conditioning agent for reducing fly ash resistivity according to claim 4, is characterized in that, described lignin sodium carbonate mass percent concentration is in the solution 0.001%-0.005%.
6. the application in high specific resistance flying dust removed by the ratio resistance conditioning agent described in any one of claim 1-5 in power plant's dedusting.
7. the using method of ratio resistance conditioning agent in power plant's dedusting described in any one of claim 1-5, it is characterized in that, sprayed into 10-40 μm of particle diameter by ratio resistance conditioning agent in flue before deduster, described ratio resistance conditioning agent is adsorbed on fly ash granule, thus reduces the ratio resistance of flying dust.
8. the described using method of ratio resistance conditioning agent in power plant's dedusting according to claim 7, is characterized in that, 10000m per hour
3needed for flue gas, the amount of ratio resistance conditioning agent is 1t.
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|---|---|---|---|
| CN201510596639.5A CN105107629A (en) | 2015-09-18 | 2015-09-18 | Specific resistance conditioning agent used for lowering fly ash resistivity and application of specific resistance conditioning agent |
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| CN201510596639.5A CN105107629A (en) | 2015-09-18 | 2015-09-18 | Specific resistance conditioning agent used for lowering fly ash resistivity and application of specific resistance conditioning agent |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996040436A1 (en) * | 1995-06-07 | 1996-12-19 | Ada Technologies, Inc. | Method for removing undesired particles from gas |
| WO2000078463A1 (en) * | 1999-06-17 | 2000-12-28 | Ada Environmental Solutions, Llc | Composition and method for flue gas conditioning |
| US6797035B2 (en) * | 2002-08-30 | 2004-09-28 | Ada Environmental Solutions, Llc | Oxidizing additives for control of particulate emissions |
| CN202398427U (en) * | 2011-12-16 | 2012-08-29 | 江苏瑞帆环保装备股份有限公司 | Device for conditioning dust on sintering machine head |
| CN104487170A (en) * | 2012-07-20 | 2015-04-01 | 诺文达集团公司 | Enhanced fly ash collection |
-
2015
- 2015-09-18 CN CN201510596639.5A patent/CN105107629A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996040436A1 (en) * | 1995-06-07 | 1996-12-19 | Ada Technologies, Inc. | Method for removing undesired particles from gas |
| WO2000078463A1 (en) * | 1999-06-17 | 2000-12-28 | Ada Environmental Solutions, Llc | Composition and method for flue gas conditioning |
| US6797035B2 (en) * | 2002-08-30 | 2004-09-28 | Ada Environmental Solutions, Llc | Oxidizing additives for control of particulate emissions |
| CN202398427U (en) * | 2011-12-16 | 2012-08-29 | 江苏瑞帆环保装备股份有限公司 | Device for conditioning dust on sintering machine head |
| CN104487170A (en) * | 2012-07-20 | 2015-04-01 | 诺文达集团公司 | Enhanced fly ash collection |
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Application publication date: 20151202 |