CN206771420U - A kind of block-resistant type air preheater step-by-step arrangement system - Google Patents

A kind of block-resistant type air preheater step-by-step arrangement system Download PDF

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Publication number
CN206771420U
CN206771420U CN201720509389.1U CN201720509389U CN206771420U CN 206771420 U CN206771420 U CN 206771420U CN 201720509389 U CN201720509389 U CN 201720509389U CN 206771420 U CN206771420 U CN 206771420U
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air preheater
air
temperature
preheater
flue
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党黎军
杨辉
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

A kind of block-resistant type air preheater step-by-step arrangement system, including it is arranged in the high-temperature air preheater after boiler back end ductwork SCR denitration device;The flue gas of high-temperature air preheater outlet enters hot electrostatic precipitator through flue, and the flue gas of hot electrostatic precipitator outlet enters in low-temperature air preheater through flue again to be exchanged heat;Cold First air enters low-temperature air preheater through a cold air channel, air-supply enters low-temperature air preheater through air supply duct, after cold First air and air-supply absorb flue gas heat in low-temperature air preheater, enter the First air side and air-supply side entrance of high-temperature air preheater through medium temperature a wind pipe and medium temperature air supply duct respectively.Air preheater step-by-step arrangement system can fundamentally solve the stifled grey problem of air preheater in the utility model, and so as to effectively reduce exhaust gas temperature, and a wind-warm syndrome, secondary air temperature can increase, and boiler thermal output gets a promotion.

Description

A kind of block-resistant type air preheater step-by-step arrangement system
Technical field
The utility model belongs to field of boilers, and in particular to a kind of block-resistant type air preheater step-by-step arrangement system.
Background technology
Visual plant of the air preheater (hereinafter referred to as " air preheater ") as station boiler, its effect is to utilize pot Air needed for the burning of stove tail flue gas heat.For rotary regenerative air preheater, if air preheater exchange capability of heat Decline, on the one hand cause exhaust gas temperature to raise, heat loss due to exhaust gas increase, boiler thermal output reduces;Another aspect air is pre- Hot device outlet heat primary air temperature reduces, if maintaining the pulverizer outlet temperature under given coal-supplying amount, then can cause First air Amount increases, the increase of primary air fan consumption rate.Hot secondary air temperature reduces, then can influence the reduction of furnace flame temperature.
According to statistics, domestic most power plant face Ash Blocking in Air Preheater problem, air preheat during some power plant's high load capacities Device fume side differential pressure is 2kPa~3kPa, causes blower fan consumption rate bigger than normal, has a strong impact on unit on-load ability, is forced dock Reason.The decline of air preheater exchange capability of heat is mainly relevant with the stifled grey factor of air preheater heat accumulating element corrosion, causes air pre- The reason for corrosion of hot device heat accumulating element is stifled grey has two kinds.One kind blocks up grey type for ammonium hydrogen sulfate corrosion;Another kind is low-temperature corrosion.Closely As the progressively implementation that minimum discharge is transformed, domestic most coal units are provided with 3 layers of denitrating catalyst, realize denitration over year The raising of efficiency, denitrating system outlet NOx disclosure satisfy that no more than 50mg/m3It is required that the increasing yet with caltalyst accumulated amount Add, SO in flue gas2To SO3Conversion ratio rise, SO in flue gas3Concentration increase, in the case of a certain amount of the escaping of ammonia, causes denitration System outlet ammonium hydrogen sulfate growing amount increases, (the conventional air preheater middle-temperature section when cigarette temperature is in 146 DEG C~230 DEG C of scopes At low-temperature zone heat accumulating element) ammonium hydrogen sulfate is liquid, now the ammonium hydrogen sulfate of liquid coheres the fly ash granule in flue gas, causes The stifled ash of air preheater corrosion.Additionally, due to SO in flue gas3Concentration increase, improves flue gas acid dew point, adds air preheat The risk of device low-temperature zone heat accumulating element low-temperature corrosion.
Utility model content
The purpose of this utility model is to provide a kind of block-resistant type air preheater step-by-step arrangement system, the system and tradition Boiler air preheater system is compared, and can effectively control air preheater heat accumulating element burn into block up grey problem.Air preheater Step-by-step arrangement system is by most of fly ash granule in flue gas and its SO of absorption2、SO3Removed, flying dust in one side flue gas Grain concentration substantially reduces, and controls liquid sulfuric acid hydrogen ammonium in air preheater heat accumulating element and coheres fly ash granule in flue gas and causes sternly The trend of ash is blocked up again;SO in another aspect flue gas2、SO3Concentration reduces, and flue gas acid dew point temperature reduces, air preheater accumulation of heat member The risk that low-temperature corrosion occurs for part declines, and ensures that the stifled ash of burn into does not occur for air preheater heat accumulating element under the two collective effect Problem.
In order to achieve the above object, the technical solution adopted in the utility model is:
A kind of block-resistant type air preheater step-by-step arrangement system, including after being arranged in boiler back end ductwork SCR denitration device High-temperature air preheater, hot electrostatic precipitator and low-temperature air preheater;The flue gas of high-temperature air preheater outlet is through cigarette Road enters hot electrostatic precipitator, and the flue gas of hot electrostatic precipitator outlet enters in low-temperature air preheater through flue again to be changed Heat;After cold First air and air-supply absorb flue gas heat in low-temperature air preheater, respectively through medium temperature a wind pipe and medium temperature Air supply duct enters the First air side and air-supply side entrance of high-temperature air preheater.
The utility model, which further improves, to be, high-temperature air preheater is tubular air preheater or swinging air Preheater, low-temperature air preheater are rotary regenerative air preheater.
The utility model, which further improves, to be, steam or sound wave are provided with the smoke inlet of high-temperature air preheater Soot blower, cigarette temperature alarm device and spraying system of fire fighting.
The utility model, which further improves, to be, double medium soot blowings are provided with the smoke inlet of low-temperature air preheater Device.
The utility model further improve is, low-temperature air preheater exiting flue gas after low temperature electric precipitation successively By air-introduced machine with being discharged after desulfurizer.
The utility model, which further improves, to be, the entrance and exit of hot electrostatic precipitator is horn-like flue, and Deflector is provided with horn-like flue.
The utility model, which further improves, to be, the heat accumulating element of high-temperature air preheater highly be 800mm~ 1100mm;Cold First air enters low-temperature air preheater through a cold air channel, blows and is preheated through air supply duct into Cryogenic air Device.
The utility model, which further improves, to be, the heat accumulating element of low-temperature air preheater is highly 1000mm.
The utility model further improve is, flue, a wind pipe, medium temperature air supply duct, air supply duct and Some type metal expansion joints are arranged with air channel.
The utility model, which further improves, to be, the elbow of flue is disposed with flue deflector.
Compared with prior art, the beneficial effects of the utility model are:
The utility model is respectively height by being provided with two air preheater systems connected in boiler smoke flow Warm air preheater and low-temperature air preheater, it is disposed between high-temperature air preheater and low-temperature air preheater on flue Hot electrostatic precipitator inlet flue gas temperature can be reduced to 250 DEG C by hot electrostatic precipitator, the setting of high-temperature air preheater, on the one hand 230 DEG C of the temperature spot that this temperature is changed into liquid sulfuric acid hydrogen ammonium compared with gaseous sulfuric acid hydrogen ammonium is higher, make flue-gas temperature be down to 230 DEG C it Most of fly ash granule can remove in preceding flue gas, while adsorb sour gas (such as SO on fly ash granule2、SO3) in the lump by Removing, the fly ash granule content after hot electrostatic precipitator in flue gas substantially reduces, even if NH in flue gas3With SO2, water vapour it is anti- Should generate ammonium hydrogen sulfate, but due in flue gas fly ash granule significantly reduce, liquid sulfuric acid hydrogen ammonium cohere fly ash granule be attached to it is low The problem of heat accumulating element of warm air preheater, is controlled, and due to SO2Concentration reduces, and flue gas acid dew point temperature reduces, bright It is aobvious to improve low-temperature air preheater running environment.High-temperature air preheater and low-temperature air preheater in the utility model Heat accumulating element heat exchange area is identical with conventional air preheater, but air preheater step-by-step arrangement system can be solved fundamentally The stifled grey problem of air preheater, so as to effectively reduce exhaust gas temperature, and a wind-warm syndrome, secondary air temperature can increase, pot Furnace thermal efficiency gets a promotion.
Further, for conventional air preheater, high-temperature air preheater and low-temperature air preheater accumulation of heat Element heights are 800mm~1100mm, and height is only conventional air preheater heat accumulating element mid-height or so, even if high temperature is empty Air preheater, low-temperature air preheater still suffer from slight stifled grey problem, because low-temperature air preheater heat accumulating element highly has Limit, low-temperature air preheater soot blower can effectively penetrate whole heat accumulating element, reach preferable soot blowing effect.
Further, because the exit gas temperature of high-temperature air preheater 1 is higher than 230 DEG C, the ammonium hydrogen sulfate under this cigarette temperature For gaseous state, cause to block up the situation of ash in the absence of fly ash granule is cohered.The heat primary air temperature of the outlet of high-temperature air preheater 1, air-supply Temperature disclosure satisfy that boiler milling system and combustion requirements.
Brief description of the drawings
Fig. 1 is the utility model block-resistant type air preheater step-by-step arrangement system schematic;
Wherein, 1 is high-temperature air preheater, and 2 be low-temperature air preheater, and 3 be hot electrostatic precipitator, and 4 be flue, and 5 are Ash bucket, 6 be steam or acoustic wave ash ejector, and 7 be type metal expansion joint, and 8 be double medium soot blowers, and 9 be medium temperature a wind pipe, and 10 are Medium temperature air supply duct, 11 be air supply duct, and 12 be cold a wind pipe, and 13 be deflector;14 be insulator chamber, and 15 lead for flue Flowing plate.
Embodiment
The utility model is described in further details below in conjunction with the accompanying drawings.
Referring to Fig. 1, the utility model be based on conventional air preheater difference arrangement, propose a kind of block-resistant type air Preheater step-by-step arrangement system, it is therefore an objective on the basis of boiler thermal output is not influenceed, thoroughly improve air preheater heat accumulating element Working environment, to tackle the stifled grey problem of air preheater generally existing after SCR denitration device puts into operation.
The system includes high-temperature air preheater 1, hot electrostatic precipitator 3 and low-temperature air preheater 2.Cryogenic air is pre- Before hot device 2 is arranged in low temperature electric cleaner, the fume side between high-temperature air preheater and low-temperature air preheater is disposed with high temperature Electric cleaner, the wind side between high-temperature air preheater and low-temperature air preheater is disposed with medium temperature a wind pipe 9 and medium temperature is sent Wind pipeline 10.
High-temperature air preheater and low-temperature air preheater are arranged in boiler tail flue gas flow.High-temperature air preheater After 1 is arranged in conventional boiler back-end ductwork SCR denitration device, the cigarette temperature into high-temperature air preheater 1 is about 350 DEG C or so, After the heat exchange of high-temperature air preheater 1, flue-gas temperature is reduced to about 250 DEG C.Due to the exit gas temperature of high-temperature air preheater 1 Higher than 230 DEG C, ammonium hydrogen sulfate is gaseous state under this cigarette temperature, causes to block up the situation of ash in the absence of fly ash granule is cohered.High temperature air The exiting flue gas of preheater 1 enters hot electrostatic precipitator 3 through flue 4, and hot electrostatic precipitator 3 exports cleaner flue gas and passes through cigarette again Road 4, which enters in low-temperature air preheater 2, to be exchanged heat.The exiting flue gas of low-temperature air preheater 2 again after low temperature electric precipitation according to It is secondary to pass through air-introduced machine, desulfurizer, discharged from chimney.Most of fly ash granule is removed in flue gas in hot electrostatic precipitator 3, Sour gas (such as SO of the absorption on fly ash granule simultaneously2、SO3) be removed in the lump, after hot electrostatic precipitator 3 in flue gas Fly ash granule content substantially reduces, even if NH in flue gas3With SO2, steam reaction generation ammonium hydrogen sulfate, but due in flue gas fly Ash particle significantly reduces, and liquid sulfuric acid hydrogen ammonium coheres the problem of fly ash granule is attached to the heat accumulating element of low-temperature air preheater 2 Controlled.
The cold First air (i.e. pressure-air) of primary air fan outlet enters low-temperature air preheater 2 through a cold air channel 12, Air-supply enters low-temperature air preheater 2 through pressure fan, air supply duct 11, and cold First air and air-supply are in low-temperature air preheater 2 After absorbing flue gas heat, enter high-temperature air preheater 1 once through medium temperature a wind pipe 9 and medium temperature air supply duct 10 respectively Wind side and air-supply side entrance, the heat primary air temperature of the outlet of high-temperature air preheater 1, wind pushing temperature disclosure satisfy that boiler milling system And combustion requirements.
High-temperature air preheater 1 can be rotary regenerative air preheater or tubular air preheater, low-temperature air preheater 2 For rotary regenerative air preheater, rotary regenerative air preheater includes two sets of transmission devices of major-minor, guide bearing and thrust bearing, fan Shape plate, stppage alarm device etc..Fixed sealing or flexible sealing etc. can be selected in the sealing device of rotary regenerative air preheater. According to boiler combustion needs, rotary regenerative air preheater can be two Fen Cang, three points of storehouses or four points of storehouses.
When high-temperature air preheater 1 is rotary regenerative air preheater, its heat accumulating element is highly 800mm~1100mm or suitable When height, heat accumulating element template is using the wide template (such as DU) of business application.The exiting flue gas temperature of high-temperature air preheater 1 About 250 DEG C or so of degree, to ensure that the cigarette temperature into hot electrostatic precipitator 3 is higher than 230 DEG C, avoid due to cigarette temperature drop as little as 230 When below DEG C, gaseous sulfuric acid hydrogen ammonium is converted into liquid, coheres stifled ash under the higher flue gas environment of fly ash granule content and asks Topic.Steam or acoustic wave ash ejector 6, cigarette temperature alarm device and fire-fighting spraying are provided with the smoke inlet of high-temperature air preheater 1 System.
The heat accumulating element of low-temperature air preheater 2 is highly 1000mm or so or appropriate height, heat accumulating element plating enamel, is stored Thermal element template can use the wide fat pipe of business application, big wave mode template.At the smoke inlet of low-temperature air preheater 2 It is provided with double medium soot blowers 8.
The utility model in boiler tail SCR denitration device exhaust pass by arranging high-temperature air preheater, flue gas warp As little as 250 DEG C or so of cigarette temperature drop after high-temperature air preheater, the flue gas of high-temperature air preheater outlet pass through hot electrostatic precipitator, Hot electrostatic precipitator removes most of fly ash granule in flue gas under about 250 DEG C of cigarette temperature, and in the process due to flying dust The suction-operated of grain, acid gas in flue gas SO2、SO3Removed in the lump Deng with fly ash granule.Hot electrostatic precipitator exports Flue gas passes through low-temperature air preheater again, now into fly ash granule content, SO in the flue gas of low-temperature air preheater2And SO3's Concentration has reduced, even if NH in flue gas3With SO2, steam reaction generation ammonium hydrogen sulfate, but due in flue gas fly ash granule it is obvious Reducing, liquid sulfuric acid hydrogen ammonium coheres the problem of fly ash granule is attached to air preheater heat accumulating element and controlled, and due to SO2 Concentration is reduced, and flue gas acid dew point temperature reduces, and the risk of low-temperature air preheater heat accumulating element low-temperature corrosion is controlled.Cold one Secondary airduct, air supply duct are correspondingly connected to the First air of low-temperature air preheater, air-supply side, and primary air fan, pressure fan export Cold wind after being heated by low-temperature air preheater, then by medium temperature primary air piping, that medium temperature ajutage correspondingly introduces high temperature air is pre- The First air of hot device, air-supply side, the heat primary air temperature of high-temperature air preheater outlet, wind pushing temperature disclosure satisfy that boiler powder system System and combustion requirements.
To ensure flue, air channel swell increment in the process of running, the flue 4 of arrangement, cold air channel 12, an air supply duct 11st, medium temperature a wind pipe 9, be arranged with some type metal expansion joints 7 in medium temperature air supply duct 10, with extraction duct because heat expansion is cold The changes of size caused by reason such as contracting.
The entrance of hot electrostatic precipitator 3 and exit are horn-like flue, and deflector 13 is disposed with horn-like flue, So that the flue gas into hot electrostatic precipitator 3 is uniform.The operating temperature of hot electrostatic precipitator 3 is at 250 DEG C or so, and high-temperature electric 1~2 electric field, including insulator chamber 14, positive plate, cathode line, rapping apparatus and ash bucket 5 etc. are set in deduster 3.Low temperature Electric cleaner is arranged in the flue after low-temperature air preheater.
The inlet flue duct elbow of high temperature electric precipitation 3 and exhaust pass elbow are that the elbow of flue 4 is arranged with flue Deflector 15.
The utility model has advantages below:
(1) air preheater system of two series connection is provided with boiler smoke flow, respectively high temperature air preheats Device and low-temperature air preheater.Hot electrostatic precipitator inlet flue gas temperature can be reduced to 250 DEG C by the setting of high-temperature air preheater, So that the cigarette temperature into hot electrostatic precipitator is higher than 230 DEG C, on the one hand this temperature is changed into liquid sulfuric acid compared with gaseous sulfuric acid hydrogen ammonium 230 DEG C of the temperature spot of hydrogen ammonium is higher, and flue-gas temperature is down to before 230 DEG C, most of fly ash granule removes in flue gas, keeps away When exempting from due to as little as less than 230 DEG C of cigarette temperature drop, gaseous sulfuric acid hydrogen ammonium is converted into liquid, in the higher flue gas ring of fly ash granule content Stifled grey problem is cohered under border, hence it is evident that improve low-temperature air preheater running environment.
(2) for conventional air preheater, high-temperature air preheater and low-temperature air preheater heat accumulating element are high Degree is only conventional air preheater heat accumulating element mid-height or so, even if high-temperature air preheater, low-temperature air preheater are still In the presence of slight stifled grey problem, due to low-temperature air preheater heat accumulating element limited height, low-temperature air preheater soot blower energy It is enough effectively to penetrate whole heat accumulating element, reach preferable soot blowing effect.
(3) air preheater heat accumulating element heat exchange area is consistent compared with conventional air preheater, but air preheater point Section arrangement system can fundamentally solve the stifled grey problem of air preheater, so as to effectively reduce exhaust gas temperature, and once Wind-warm syndrome, secondary air temperature can increase, and boiler thermal output gets a promotion.Because the utility model air preheater can be solved effectively Ash Blocking in Air Preheater problem, reduces flue gas collateral resistance in operation, and blower fan consumption rate substantially reduces.

Claims (10)

1. a kind of block-resistant type air preheater step-by-step arrangement system, it is characterised in that taken off including being arranged in boiler back end ductwork SCR High-temperature air preheater (1), hot electrostatic precipitator (3) and low-temperature air preheater (2) after nitre device;High temperature air preheats The flue gas of device (1) outlet enters hot electrostatic precipitator (3) through flue (4), and the flue gas of hot electrostatic precipitator (3) outlet is again through flue (4) enter in low-temperature air preheater (2) and exchanged heat;Cold First air and air-supply absorb cigarette in low-temperature air preheater (2) After gas heat, enter high-temperature air preheater (1) once through medium temperature a wind pipe (9) and medium temperature air supply duct (10) respectively Wind side and air-supply side entrance.
A kind of 2. block-resistant type air preheater step-by-step arrangement system according to claim 1, it is characterised in that high temperature air Preheater (1) is tubular air preheater or rotary regenerative air preheater, and low-temperature air preheater (2) is swinging air preheat Device.
A kind of 3. block-resistant type air preheater step-by-step arrangement system according to claim 1, it is characterised in that high temperature air Steam or acoustic wave ash ejector (6), cigarette temperature alarm device and spraying system of fire fighting are provided with the smoke inlet of preheater (1).
A kind of 4. block-resistant type air preheater step-by-step arrangement system according to claim 1, it is characterised in that Cryogenic air Double medium soot blowers (8) are provided with the smoke inlet of preheater (2).
A kind of 5. block-resistant type air preheater step-by-step arrangement system according to claim 1, it is characterised in that Cryogenic air Preheater (2) exiting flue gas is after low temperature electric precipitation successively by air-introduced machine with being discharged after desulfurizer.
6. a kind of block-resistant type air preheater step-by-step arrangement system according to claim 1, it is characterised in that high-temperature electric removes The entrance and exit of dirt device (3) is horn-like flue, and deflector (13) is provided with horn-like flue.
A kind of 7. block-resistant type air preheater step-by-step arrangement system according to claim 6, it is characterised in that high temperature air The heat accumulating element of preheater (1) is highly 800mm~1100mm;Cold First air is pre- into Cryogenic air through a cold air channel (12) Hot device (2), blow and enter low-temperature air preheater (2) through air supply duct (11).
A kind of 8. block-resistant type air preheater step-by-step arrangement system according to claim 1, it is characterised in that Cryogenic air The heat accumulating element of preheater (2) is highly 1000mm.
A kind of 9. block-resistant type air preheater step-by-step arrangement system according to claim 1, it is characterised in that flue (4), Some metals are arranged with a wind pipe (9), medium temperature air supply duct (10), air supply duct (11) and an air channel (12) Expansion joint (7).
A kind of 10. block-resistant type air preheater step-by-step arrangement system according to claim 1, it is characterised in that flue (4) Elbow be disposed with flue deflector (15).
CN201720509389.1U 2017-05-09 2017-05-09 A kind of block-resistant type air preheater step-by-step arrangement system Active CN206771420U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106996577A (en) * 2017-05-09 2017-08-01 西安热工研究院有限公司 A kind of block-resistant type air preheater step-by-step arrangement system
CN109631075A (en) * 2019-01-31 2019-04-16 南京博沃科技发展有限公司 A kind of anti-blocking grey air quantity adjusting method of air preheater and device for monitoring running
CN110748913A (en) * 2018-07-24 2020-02-04 青岛科技大学 Power station boiler waste heat utilization system based on heat storage air temperature communication control
CN110748912A (en) * 2018-07-24 2020-02-04 青岛科技大学 Power station boiler waste heat utilization system based on smoke temperature communication control valve

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106996577A (en) * 2017-05-09 2017-08-01 西安热工研究院有限公司 A kind of block-resistant type air preheater step-by-step arrangement system
CN106996577B (en) * 2017-05-09 2023-06-27 西安热工研究院有限公司 Anti-blocking type air preheater sectionalized arrangement system
CN110748913A (en) * 2018-07-24 2020-02-04 青岛科技大学 Power station boiler waste heat utilization system based on heat storage air temperature communication control
CN110748912A (en) * 2018-07-24 2020-02-04 青岛科技大学 Power station boiler waste heat utilization system based on smoke temperature communication control valve
CN109631075A (en) * 2019-01-31 2019-04-16 南京博沃科技发展有限公司 A kind of anti-blocking grey air quantity adjusting method of air preheater and device for monitoring running

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