CN206131827U - Cold ware of high temperature cigarette fan heater system suitable for SCR deNOx systems - Google Patents
Cold ware of high temperature cigarette fan heater system suitable for SCR deNOx systems Download PDFInfo
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- CN206131827U CN206131827U CN201621168678.1U CN201621168678U CN206131827U CN 206131827 U CN206131827 U CN 206131827U CN 201621168678 U CN201621168678 U CN 201621168678U CN 206131827 U CN206131827 U CN 206131827U
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- air heater
- air
- high temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model relates to a cold ware of high temperature cigarette fan heater system suitable for SCR deNOx systems, including flue gas condenser, primary air fan, cold air duct, first fan heater, hot air duct, overfire air fan, secondary cold air duct, second fan heater, secondary hot air duct, pipeline. The utility model discloses can reduce the high temperature flue gas that the SCR reactor entered the mouth more than 410 DEG C to 380 DEG C of left and right sides, help making the SCR catalyst to be in the best operating temperature scope, reduce SCR reactor's SO2SO3 conversion rate, reduce the SO3 concentration that gets into the air preheater pre -heater and reduce SO3 and discharge to help improving the anti ammonium hydrogen sulfate capacity of blocking that temperature and reinforcing air heater are synthesized to air preheater pre -heater cold junction.
Description
Technical field
This utility model belongs to the SO in the SCR denitrating flue gas of thermal power plant3Control field, and in particular to one kind is applied to
The high temperature cigarette cooler-steam air heater system of SCR denitration system.
Background technology
Coal unit is control NOx emission, and SCR equipment for denitrifying flue gas, flue gas are arranged between boiler and air preheater
Part SO when catalyst, in flue gas2It is oxidized to SO3, and lifted with temperature, SO2/SO3Conversion ratio increases sharply, SO2/
SO3The relation of conversion ratio and temperature is referring to Fig. 1.Part uses anthracite, the station boiler of brown coal needs higher to enter stove one, two
Secondary pathogenic wind-warm, guarantees the stability burnt, and this requires the flue-gas temperature of air preheater entrance higher than 410 DEG C of enhancing air preheats
Device exchanges heat, i.e., SCR catalyst will be run at a high temperature of more than 400 DEG C, causes following Railway Project：In SCR reactors
SO2/SO3Conversion ratio is higher, the SO in exiting flue gas3Concentration increases, and affects SO3The control of concentration of emission；Air preheater entrance
SO in flue gas3Concentration increases, and deteriorates the chocking-up degree of cold end ammonium hydrogen sulfate；To reduce the SO under high temperature2/SO3Conversion ratio, needs drop
Low catalyst activity, so as to the use volume of catalyst need to be increased.
Coal unit minimum discharge service requirement controls NOx emission concentration to 50mg/m3Hereinafter, catalyst raising need to be increased
SCR denitration efficiency increased the control difficulty of ammonia slip concentration to more than 90%, especially when running temperature is more than 410 DEG C, cigarette
SO in gas3Concentration is increased considerably, and is degrading the ammonium hydrogen sulfate blocking of air preheater, be increased flue resistance power consumption, or even
Have influence on unit on-load.SCR operation flue-gas temperatures are reduced, SO of flue gas when catalyst is reduced3Generate concentration, this be from
Mitigate a new way of air preheater ammonium hydrogen sulfate blocking in root.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of SCR operation too high suitable for coal unit reduction
Flue-gas temperature, mitigate the blocking of air preheater ammonium hydrogen sulfate, and guarantee the hot blast temperature being passed through in boiler suitable for SCR denitration
The high temperature cigarette cooler-steam air heater system of system.
To solve above technical problem, this utility model is adopted the following technical scheme that：
A kind of high temperature cigarette cooler-steam air heater system suitable for SCR denitration system, it is described suitable for SCR denitration system
High temperature cigarette cooler-steam air heater system include being arranged in the flue being communicated between boiler and SCR reactors so as to will be described
Flue in flue-gas temperature reduce flue gas condenser, primary air fan, for by the outlet of described primary air fan and with institute
A cold air duct that first air intake of the air preheater that the exhanst gas outlet of the SCR reactors stated is connected is connected, set
Put the first steam air heater in a described cold air duct, for by the first air outlet slit of described air preheater with it is described
The coal pulverizer of boiler be connected and for hot-flow flue, a secondary wind of air of the conveying in a described cold air duct
Machine, the secondary cold wind for the outlet of described overfire air fan is connected with the second air intake of described air preheater
Road, the second steam air heater being arranged in described secondary cold air duct, for by the second air outlet slit of described air preheater
It is connected with described boiler and for the second heat air channel of air of the conveying in described secondary cold air duct, for by institute
The flue gas condenser stated is connected with the first described steam air heater and for by described flue gas condenser and described second
Steam air heater is connected and constitutes closed circuit so as to the air in described a cold air duct and secondary cold air duct is heated
Pipeline.
Preferably, the described high temperature cigarette cooler-steam air heater system suitable for SCR denitration system is also described including being arranged on
Pipeline on water pump.
Preferably, the described high temperature cigarette cooler-steam air heater system suitable for SCR denitration system also includes being separately positioned on
Valve on the pipeline of the entrance of the entrance and the second described steam air heater of the first described steam air heater.
Preferably, the described high temperature cigarette cooler-steam air heater system suitable for SCR denitration system is also described including being arranged on
Pipeline on attemperator.
Preferably, described flue gas condenser, described pipeline, the first described steam air heater, the second described steam air heater
Demineralized water is passed through in the closed circuit of composition.
Preferably, described flue gas condenser is fin type flue gas condenser.
Preferably, the first described steam air heater and the second described steam air heater are respectively fin type steam air heater.
Preferably, the first described steam air heater and the second described steam air heater are parallel with one another.
Preferably, the boiler described in is correspondingly arranged on the SCR reactors described in multiple stage, per the boiler described in platform and every
Flue gas condenser described in one is arranged in the flue between SCR reactors described in platform, the flue gas condenser pair described in
The primary air fan that should have described in one and the overfire air fan described in.
It is highly preferred that the boiler described in is correspondingly arranged on the SCR reactors described in two to three.
Due to the enforcement of above technical scheme, this utility model is had the advantage that compared with prior art：
1st, flue gas condenser can reduce SCR inlet flue-gas temperature to about 380 DEG C, make the denitration catalyst in SCR reactors
Agent is in optimal temperature range of operation, and the SO of denitrating catalyst can be also greatly lowered2/SO3Conversion ratio, and be conducive to improving
NOx in SCR inlet flue gas self mixing uniformity；2nd, steam air heater improves about 30 DEG C of cold wind temperature, is guaranteeing air preheater
While outlet hot blast temperature is required, air preheater cold-end air integrated temperature is improve, with reference to entrance SO3The reduction of concentration, has
Beneficial to enhancing air preheater sulfuric-resisting hydrogen ammonium blocking ability；3rd, reduce SO3Concentration of emission about 27%, contributes to realizing SO3It is up to standard
Discharge.
Description of the drawings
Accompanying drawing 1 is SO2/SO3The graph of a relation of conversion ratio and temperature；
Accompanying drawing 2 is structural representation of the present utility model；
Wherein, 1, boiler；2nd, SCR reactors；3rd, air preheater；4th, flue gas condenser；5th, flue；6th, a cold wind
Road；7th, a hot-flow flue；8th, pipeline；9th, the first steam air heater；10th, water pump；11st, valve；12nd, secondary cold air duct；13rd, the second warm braw
Device；14th, second heat air channel.
Specific embodiment
Embodiment 1：
As shown in Fig. 2 flue 5 is for the exhaust opening of boiler 1 is connected with the smoke inlet of SCR reactors 2, specifically
Ground, flue 5 be located at boiler 1 economizer and the ammonia-spraying grid of SCR reactors 2 between, the smoke inlet of air preheater 3 with
The exhanst gas outlet of SCR reactors 2 is connected.Include that flue gas is cold suitable for the high temperature cigarette cooler-steam air heater system of SCR denitration system
Condenser 4, primary air fan, overfire air fan, 6, hot-flow flue 7 of a cold air duct, the first steam air heater 9, overfire air fan, secondary cold wind
Road 12, second heat air channel 14, the second steam air heater 13, pipeline 8 and demineralized water.
Flue gas condenser 4 is arranged in flue 5.Cold air duct 6 is for by the outlet of primary air fan and air preheater 3
The first air intake be connected, a hot-flow flue 7 is for by the coal-grinding of the first air outlet slit of air preheater 3 and boiler 1
Machine is connected, so as to the air in a cold air duct 6 is entered boiler 1 by burner；Secondary cold air duct 12 is used for will
The outlet of overfire air fan is connected with the second air intake of air preheater 3, and second heat air channel 14 is for by air preheater 3
The second air outlet slit be connected with boiler 1 so as to the air in secondary cold air duct 12 is delivered in boiler 1；It is once hot
Hot-air in air channel 7 and second heat air channel 14 ensure that the stability of 1 fuel combustion of boiler.
First steam air heater 9 is arranged on the entrance of a cold air duct 6, and the second steam air heater 13 is arranged on entering for secondary cold air duct 12
Mouthful, pipeline 8 is for flue gas condenser 4 and the first steam air heater 9 and flue gas condenser 4 are connected with the second steam air heater 13 and structure
Into closed circuit, the first steam air heater 9 and the second steam air heater 13 are parallel with one another, are provided with water pump 10, positioned at the first warm braw on pipeline 8
It is separately provided for controlling the valve 11 of flow on the pipeline 8 of the entrance of the entrance of device 9 and the second steam air heater 13.On pipeline 8
It is provided with the attemperator for being incubated to pipeline 8.
In the present embodiment, flue gas condenser 4 is 13 points of fin type flue gas condenser 4, the first steam air heater 9 and the second steam air heater
Wei not fin type steam air heater.
In the present embodiment, a boiler 1 is correspondingly arranged on two SCR reactors 2 and 2 air preheaters 3, every boiler
It is provided with a flue gas condenser 4 in flue 5 between 1 and every SCR reactor 2, flue gas condenser 4 pairs there should be one
Primary air fan and an overfire air fan.
Demineralized water in the presence of water pump 10 flue gas condenser 4, pipeline 8, the first steam air heater 9, the second steam air heater 13 it
Between circulate.High-temperature flue gas in the relatively low demineralized water Jing flue gas condensers of temperature 4 and flue 5 carry out heat exchange so that
The temperature for obtaining demineralized water is raised, and the temperature of high-temperature flue gas is reduced, and the decline of demineralized water Jing pipelines 8 after temperature is raised divides two-way difference
Into the first steam air heater 9 and the second steam air heater 13 being in parallel and the heat release cooling in the first steam air heater 9 and the second steam air heater 13
So that desalination coolant-temperature gage is reduced, the air themperature in a cold air duct 6 and secondary cold air duct 12 is raised.Demineralized water is in flue gas
Continuous heat absorption is carried out between condenser 4, the first steam air heater 9 and the second steam air heater 13 and rises gentle heat release temperature-fall period, it becomes possible to
The entrance flue gas temperature of SCR reactors 2 is reduced to 380 DEG C or so, and improves the cold wind temperature of 3 air intake of air preheater extremely
45～50 DEG C.
After the reaction of denitration catalyst oxidant layer, air inlet preheater 3 discharges heat to SCR inlet flue gas after temperature reduction
130 DEG C or so discharges are reduced to, the heat that flue gas is discharged in air preheater 3 exchanges heat for the heating to air preheater 3
Element carries out accumulation of heat, is heated and changes after the cold wind air inlet preheater 3 Jing after the first steam air heater 9 and the second steam air heater 13 are heated
Thermal element is burnt into boiler 1 by a hot-flow flue 7 and second heat air channel 14 after being heated to about 370 DEG C respectively.
2 entrance flue gas temperature of SCR reactors is reduced to about 380 DEG C, SO when denitrating catalyst, in flue gas2/SO3Turn
Rate is reduced, and reduces SO3Generate, reduce the SO in 3 smoke inlet of air preheater3Concentration, alleviates air preheater 3
Ammonium hydrogen sulfate is blocked.
Embodiment 2：Using the fortune of the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system of above-described embodiment
Row case
Certain 600MW unit, at full capacity under about 410 DEG C of SCR inlet flue-gas temperature, the cigarette temperature about 340 under 350MW loads
DEG C, about 324.4 DEG C of minimum continuous spray ammonia temperature.SO in SCR inlet flue gas2About 2146 μ L/L of concentration, SO3About 21.5 μ L/L of concentration.
The SO of the SCR catalyst under design at full capacity2/SO3Conversion ratio is 1.5%, SO in 3 inlet flue gas of air preheater3Concentration is about
56.2 μ L/L, ammonium hydrogen sulfate ABS gross blockage factors Nu are 27061.
4) flue-gas temperature is reduced to after 380 DEG C by 410 DEG C by flue gas condenser, the SO of SCR catalyst2/SO3Conversion
Rate can be reduced to 0.8% by 1.5%, SO in 3 inlet flue gas of air preheater3Concentration is reduced to 41.2 μ L/L by 56.2 μ L/L.
9 heat release of steam air heater lifts about 30 DEG C of cold First air and secondary wind temperature respectively, and heat primary air and secondary wind temperature are than original design value
About 2 DEG C are reduced, exhaust gas temperature about increases by 3 DEG C than original design value.The ammonium hydrogen sulfate ABS gross blockage factor Nu of air preheater 3 are
17312, the sulfuric-resisting hydrogen ammonium blocking ability of air preheater 3 is greatly improved.Original design performance data and flue gas condensing
The contrast of 9 improved performance data of device 4- steam air heaters is shown in Table 1.
About 340 DEG C of SCR inlet flue-gas temperature during unit 350MW underrun, to guarantee SCR inlet flue-gas temperature not
Less than 324.4 DEG C of minimum continuous spray ammonia temperature, need to suitably reduce the water circulation speed in pipeline 8, reduce the heat absorption of cigarette cooler, really
Protect SCR bringing normally into operation.
Table 1
Above this utility model is described in detail, its object is to make the personage's energy for being familiar with this art much of that
Solve content of the present utility model and be carried out, protection domain of the present utility model can not be limited with this, it is all according to this practicality
Equivalence changes or modification that new spirit is made, should all cover in protection domain of the present utility model.
Claims (10)
1. a kind of high temperature cigarette cooler-steam air heater system suitable for SCR denitration system, it is characterised in that：It is described suitable for SCR
The high temperature cigarette cooler-steam air heater system of denitrating system includes being arranged on and is communicated in boiler（1）With SCR reactors（2）Between cigarette
Road（5）It is interior so as to by described flue（5）The flue gas condenser that interior flue-gas temperature is reduced（4）, primary air fan, for will be described
Primary air fan outlet and with described SCR reactors（2）The air preheater that is connected of exhanst gas outlet（3）It is first empty
The cold air duct that gas entrance is connected（6）, be arranged on a described cold air duct（6）The first interior steam air heater（9）, for will
Described air preheater（3）The first air outlet slit and described boiler（1）Coal pulverizer be connected and for conveying from
A described cold air duct（6）Hot-flow flue of interior air（7）, overfire air fan, for going out described overfire air fan
Mouth and described air preheater（3）The secondary cold air duct that is connected of second air intake（12）, be arranged on it is described secondary
Cold air duct（12）The second interior steam air heater（13）, for by described air preheater（3）The second air outlet slit with it is described
Boiler（1）It is connected and for conveying from described secondary cold air duct（12）The second heat air channel of interior air（14）, be used for
By described flue gas condenser（4）With the first described steam air heater（9）It is connected and for by described flue gas condenser（4）
With the second described steam air heater（13）It is connected and constitutes closed circuit so as to by a described cold air duct（6）With it is secondary
Cold air duct（12）The pipeline of interior air heating（8）.
2. the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system according to claim 1, it is characterised in that：
The described high temperature cigarette cooler-steam air heater system suitable for SCR denitration system also includes being arranged on described pipeline（8）On water
Pump（10）.
3. the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system according to claim 1, it is characterised in that：
The described high temperature cigarette cooler-steam air heater system suitable for SCR denitration system also includes being separately positioned on positioned at described first
Steam air heater（9）Entrance and the second described steam air heater（13）Entrance pipeline（8）On valve（11）.
4. the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system according to claim 1, it is characterised in that：
The described high temperature cigarette cooler-steam air heater system suitable for SCR denitration system also includes being arranged on described pipeline（8）On guarantor
Warm device.
5. the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system according to claim 1, it is characterised in that：
Described flue gas condenser（4）, described pipeline（8）, described first steam air heater（9）, described second steam air heater（13）Structure
Into closed circuit in be passed through demineralized water.
6. the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system according to claim 1, it is characterised in that：
Described flue gas condenser（4）For fin type flue gas condenser（4）.
7. the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system according to claim 1, it is characterised in that：
The first described steam air heater（9）With the second described steam air heater（13）Respectively fin type steam air heater.
8. the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system according to claim 1, it is characterised in that：
The first described steam air heater（9）With the second described steam air heater（13）It is parallel with one another.
9. the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system according to claim 1, it is characterised in that：
Boiler described in one（1）The SCR reactors being correspondingly arranged on described in multiple stage（2）, per the boiler described in platform（1）With per described in platform
SCR reactors（2）Between flue（5）Flue gas condenser described in interior setting one（4）, the flue gas condenser described in
（4）To the overfire air fan described in the primary air fan that should have described in one and.
10. the high temperature cigarette cooler-steam air heater system suitable for SCR denitration system according to claim 9, its feature exist
In：Boiler described in one（1）The SCR reactors being correspondingly arranged on described in two to three（2）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621168678.1U CN206131827U (en) | 2016-11-02 | 2016-11-02 | Cold ware of high temperature cigarette fan heater system suitable for SCR deNOx systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621168678.1U CN206131827U (en) | 2016-11-02 | 2016-11-02 | Cold ware of high temperature cigarette fan heater system suitable for SCR deNOx systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206131827U true CN206131827U (en) | 2017-04-26 |
Family
ID=58576388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621168678.1U Withdrawn - After Issue CN206131827U (en) | 2016-11-02 | 2016-11-02 | Cold ware of high temperature cigarette fan heater system suitable for SCR deNOx systems |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206131827U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556022A (en) * | 2016-11-02 | 2017-04-05 | 苏州西热节能环保技术有限公司 | A kind of high temperature cigarette cooler steam air heater system suitable for SCR denitration system |
-
2016
- 2016-11-02 CN CN201621168678.1U patent/CN206131827U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106556022A (en) * | 2016-11-02 | 2017-04-05 | 苏州西热节能环保技术有限公司 | A kind of high temperature cigarette cooler steam air heater system suitable for SCR denitration system |
| CN106556022B (en) * | 2016-11-02 | 2019-05-03 | 苏州西热节能环保技术有限公司 | A kind of high temperature cigarette cooler-steam air heater system suitable for SCR denitration system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170426 Effective date of abandoning: 20190503 |
|
| AV01 | Patent right actively abandoned |