CN206597462U - A kind of system for avoiding air preheater surfaces from generating ammonium hydrogen sulfate - Google Patents
A kind of system for avoiding air preheater surfaces from generating ammonium hydrogen sulfate Download PDFInfo
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- CN206597462U CN206597462U CN201720227183.XU CN201720227183U CN206597462U CN 206597462 U CN206597462 U CN 206597462U CN 201720227183 U CN201720227183 U CN 201720227183U CN 206597462 U CN206597462 U CN 206597462U
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- Prior art keywords
- air preheater
- hydrogen sulfate
- ammonia
- flue gas
- ammonium hydrogen
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Abstract
The utility model discloses a kind of system for avoiding air preheater surfaces from generating ammonium hydrogen sulfate, compared with conventional boiler afterbody system, the system has installed escape ammonia removal system additional, it launches a large amount of high energy electrons using ion generator, oxygen molecule and high energy electron fierceness in fresh air collide and form active oxygen ion, active oxygen ion and escape ammonia react to reach the effect of removing escape ammonia, and then avoid escape ammonia and SO3Reacted in air preheater surfaces, prevent the generation of ammonium hydrogen sulfate, can effectively prevent the dust stratification of air preheater surfaces from blocking.The utility model can fundamentally remove the escape ammonia that SCR device crosses spray, it is to avoid ammonium hydrogen sulfate is adhered on air preheater surfaces, effectively avoid the problem of power station boiler air pre-heater superficial dust is blocked, and greatly improve the economy of station boiler.
Description
Technical field
The utility model belongs to the Anti-clogging technical field of coal fired power plant air preheater, and more particularly to one kind avoids sky
The system of air preheater Surface Creation ammonium hydrogen sulfate.
Background technology
Coal-burning power plant's SCR denitration device needs to spray into substantial amounts of NH during NOx is removed3, part NH3Fail completely
Denitration reaction is participated in cause certain density the escaping of ammonia.In addition, the catalyst in SCR system is to the SO in flue gas2Have
Certain catalytic action, causes to there are about 0.3~2% SO2It is oxidized to SO3。NH3And SO3Carried by flue gas to the air in downstream
In preheater, and ammonium hydrogen sulfate is generated in air preheater surfaces, its reaction is as follows：NH3+SO3+H2O=NH4HSO4, hydrogen sulfate
The dew point of ammonium is 147 DEG C, and it is in molten in the range of 147~207 DEG C.Temperature after flue gas air inlet preheater after denitration
Be gradually reduced, when temperature is down to below 207 DEG C, gaseous sulfuric acid hydrogen ammonium in flue gas can air preheater heat transfer element table
Face solidifies.Ammonium hydrogen sulfate is a kind of viscosity very strong material, and flying dust can be adhered in flue gas, air preheater dust stratification is caused
Block, cause the resistance of air preheater to become big, heat exchange efficiency reduction, have a strong impact on the economy of station boiler.The country is existing
Part power plant is because that can not solve or alleviate the problem of ammonium hydrogen sulfate dust stratification is blocked by forced-stopping machine.
The measure that conventional reply air preheater dust stratification is blocked includes installing steam air heater additional or uses thermal wind sensor system, but
Both counter-measures are all, to sacrifice the utilization rate of air preheater as cost, to greatly reduce the heat exchange of air preheater
Performance, causes exhaust gas temperature to increase, flue gas loss increase, and in fact, some power plant are also failed to using above two measure
Play the effect that substantially reduction air preheater dust stratification is blocked.The high-pressure washing technology that part power plant uses is also because cost is higher
Fail to promote, according to statistics, after dust stratification, which occurs, for air preheater blocks, the cycle of high-pressure washing is about 3-12 months, and unit is opened
Stop an expense huge, by taking 600MW units as an example, per start and stop once, about 2,000,000 yuan of expense.Currently for station boiler air
The phenomenon that preheater dust stratification is blocked, still without effective solution.
The content of the invention
The purpose of this utility model is that escape ammonia and SO can fundamentally be avoided by providing one kind3In air preheater table
Face reacts, and prevents the generation of ammonium hydrogen sulfate, and can effectively prevent the blocking of air preheater surfaces dust stratification avoids air
The system that preheater surfaces generate ammonium hydrogen sulfate.
For up to above-mentioned purpose, the technical solution adopted in the utility model is：Including flow of flue gas system, escape ammonia removal system
System and ammonia process wet desulphurisation system；
Described flow of flue gas system includes the SCR denitration device being connected with boiler economizer exiting flue gas, SCR denitration
Device bypass is provided with ammonia spout, and SCR denitration device outlet connection mixed reactor, mixed reactor connection air is pre-
Hot device, air preheater connection desulfurizing tower, the flue gas after being handled via desulfurizing tower is discharged to air；
Described escape ammonia removal system includes the filter being connected with fresh air inlet, filter outlet connection air-supply
Machine, pressure fan is connected by ion generator with mixed reactor；
The described ammonia water spray device for being installed on desulfurizing tower top exit.
Compared to prior art, the utility model has the following advantages：
The method that the utility model is ionized using ion removes the escape ammonia in the flue gas for flowing through SCR denitration device, that is, leads to
Cross and install ion emitter additional, can be from root using the excessive spray ammonia of the reaction efficient removal SCR device of active oxygen ion and ammonia
The generation of ammonium hydrogen sulfate is avoided in sheet, the effect that prevention air preheater dust stratification is blocked is reached, while wet ammonia process desulfurizing system
Can be by micro NOx and SO2Remove, it is to avoid be directly discharged in air, effectively reduce the discharge of pollutant.This practicality is new
Type can avoid the blocking of air preheater and reduce the discharge of pollutant.
Brief description of the drawings
Fig. 1 is overall structure diagram of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
Referring to Fig. 1, the utility model includes flow of flue gas system, escape ammonia removal system and ammonia process wet type desulfurizing system
System；
Described flow of flue gas system includes the SCR denitration device 6 being connected with boiler economizer exiting flue gas, and SCR takes off
The bypass of nitre device 6 is provided with ammonia spout 5, and the outlet of SCR denitration device 6 connection mixed reactor 7, mixed reactor 7 connects
Air preheater 8 is connect, the connection desulfurizing tower 9 of air preheater 8, the flue gas after being handled via desulfurizing tower 9 is discharged to air；
Described escape ammonia removal system includes the filter 2 being connected with fresh air inlet 1, the outlet of filter 2 connection
Pressure fan 3, pressure fan 3 is connected by ion generator 4 with mixed reactor 7；
Fresh air inlet 1 connects filter 2, after removing impurity through filter 2, then is sent fresh air by pressure fan 3
Enter ion generator 4, ion generator 4 launches a large amount of high energy electrons in the presence of electric field, and high energy electron is filled in hybrid reaction
Put in 7 and collided with the oxygen molecule in air and form active oxygen ion O2 +/O2 -.Active oxygen ion O2 +/O2 -With the ammonia in flue gas
React to remove the spray ammonia of SCR excessively, occur following reaction：NH3+O2 ++O2 -→NOx+3H2O, its conversion ratio 95% with
On.Therefore the escape ammonia in flue gas can be effectively removed, fundamentally avoids air preheater surfaces generation ammonium hydrogen sulfate.
Micro NOx will be generated after escape ammonia by being removed in mixed reactor.
The described ammonia water spray device 10 for being installed on the top exit of desulfurizing tower 9.After the removing escape ammonia of mixed reactor 7
The micro NOx of generation can be with the SO in doctor solution3 2-Complicated sulphur nitrogen compound is generated, while the SO in flue gas2Also can be in desulfurization
It is removed in tower 9.
The micro NOx generated after mixed reactor removing escape ammonia can be with the SO in doctor solution3 2-Generate complicated sulphur nitrogen
Compound, while the SO in flue gas2Also it can be removed in desulfurizing tower.Therefore micro NOx and SO can be avoided2Directly discharge
Polluted among air.
The utility model comprises the following steps：
When boiler SCR denitration device 6 is run, it is ensured that sufficient spray ammonia is most of in flue gas to remove as far as possible
NOx, while fresh air is sent into escape ammonia removal system, open ion generator make its produce substantial amounts of high energy active oxygen from
Son.Active oxygen ion is carried to mixed reactor using fresh air, and flows through the flue gas generation of mixed reactor instead
Should, excessive spray ammonia during removing SCR denitration.The micro NOx of this reaction generation finally flows into desulfurization under the carrying of flue gas
In tower, and with the SO in doctor solution3 2-Occurs complicated chemical reaction generation sulphur nitride, it is to avoid by SO2With micro NOx emission
Into air.
The utility model can fundamentally avoid the generation of ammonium hydrogen sulfate, reach what prevention air preheater dust stratification was blocked
Effect, while wet ammonia process desulfurizing system can be by micro NOx and SO2Remove, it is to avoid be directly discharged in air, effectively drop
The low discharge of pollutant.Compared with the measure that traditional prevention air preheater dust stratification is blocked, the utility model has higher
Efficiency and relatively low cost.
Claims (1)
1. a kind of system for avoiding air preheater surfaces from generating ammonium hydrogen sulfate, it is characterised in that：Including flow of flue gas system, escape
Ammonia removal system of escaping and ammonia process wet desulphurisation system；
Described flow of flue gas system includes the SCR denitration device (6) being connected with boiler economizer exiting flue gas, SCR denitration
Device (6) bypass is provided with ammonia spout (5), SCR denitration device (6) outlet connection mixed reactor (7), hybrid reaction dress
(7) connection air preheater (8) is put, air preheater (8) connection desulfurizing tower (9), the flue gas after being handled via desulfurizing tower (9) is arranged
To air；
Described escape ammonia removal system includes the filter (2) being connected with fresh air inlet (1), and filter (2) outlet connects
Blower fan (3) is picked, pressure fan (3) is connected by ion generator (4) with mixed reactor (7)；
The described ammonia water spray device (10) for being installed on desulfurizing tower (9) top exit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720227183.XU CN206597462U (en) | 2017-03-09 | 2017-03-09 | A kind of system for avoiding air preheater surfaces from generating ammonium hydrogen sulfate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720227183.XU CN206597462U (en) | 2017-03-09 | 2017-03-09 | A kind of system for avoiding air preheater surfaces from generating ammonium hydrogen sulfate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206597462U true CN206597462U (en) | 2017-10-31 |
Family
ID=60147002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720227183.XU Expired - Fee Related CN206597462U (en) | 2017-03-09 | 2017-03-09 | A kind of system for avoiding air preheater surfaces from generating ammonium hydrogen sulfate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206597462U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107965787A (en) * | 2017-11-22 | 2018-04-27 | 西安交通大学 | System and method for the classification rotary regenerative air preheater for mitigating ammonium hydrogen sulfate deposition |
-
2017
- 2017-03-09 CN CN201720227183.XU patent/CN206597462U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107965787A (en) * | 2017-11-22 | 2018-04-27 | 西安交通大学 | System and method for the classification rotary regenerative air preheater for mitigating ammonium hydrogen sulfate deposition |
| CN107965787B (en) * | 2017-11-22 | 2019-06-11 | 西安交通大学 | For mitigating the system and method for the classification rotary regenerative air preheater of ammonium hydrogen sulfate deposition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171031 Termination date: 20190309 |