CN105972632A - System and process for protecting air preheater of coal-fired power plant from blockage and corrosion through hot-air counterflow - Google Patents
System and process for protecting air preheater of coal-fired power plant from blockage and corrosion through hot-air counterflow Download PDFInfo
- Publication number
- CN105972632A CN105972632A CN201610295797.1A CN201610295797A CN105972632A CN 105972632 A CN105972632 A CN 105972632A CN 201610295797 A CN201610295797 A CN 201610295797A CN 105972632 A CN105972632 A CN 105972632A
- Authority
- CN
- China
- Prior art keywords
- hot
- air
- cold
- hot blast
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D11/00—Heat-exchange apparatus employing moving conduits
- F28D11/02—Heat-exchange apparatus employing moving conduits the movement being rotary, e.g. performed by a drum or roller
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention relates to a system and process for protecting an air preheater of a coal-fired power plant from blockage and corrosion through hot-air counterflow, and aims to overcome the defect that in the prior art, no system can be adopted for effectively protecting the heating surface of the air preheater from corrosion and blockage. The system comprises a tri-sectional rotary air preheater, a heat exchanging sheet, a hot primary air pipeline and a hot secondary air pipeline, and is characterized by further comprising a hot primary air lead-out pipeline, a hot secondary air lead-out pipeline, a hot air lead-in cold-end pipeline and a hot air communication pipeline; first fan-shaped plates composed of a cold-end first fan-shaped plate and a hot-end first fan-shaped plate are arranged in the tri-sectional rotary air preheater; an independent counterflow heating bin is formed between the cold-end first fan-shaped plate and the hot-end first fan-shaped plate, and positioned between a secondary air sectional bin and a smoke sectional bin; a cold-end stable pressure cavity is formed in the cold-end first fan-shaped plate; and a hot-end balanced pressure cavity is formed in the hot-end first fan-shaped plate. By adoption of the system and the process provided by the invention, the problem that the heat exchanging surface of the air preheater is subjected to relatively severe corrosion and blockage when a coal-fired power plant boiler is operational can be effectively solved.
Description
Technical field
The present invention relates to that air preheater hot blast adverse current in a kind of coal-burning power plant is the most anti-blocking and the system of corrosion and technique thereof, belong to the blocking of coal-fired power station boiler air preheater, corrosion Prevention Technique field.
Background technology
Coal-burning power plant can generate SO when using the ature of coal containing certain sulfur3, the SO that generated3Amount affected from several ppm to tens ppm the highest by factors such as coal sulfur height.By environmental protection standard control, coal-burning power plant installs SCR system the most entirely, for the NO producing burningxCarry out removing to meet environmental protection standard to NOxThe requirement of concentration of emission.SCR system removing NOxProcess need according to boiler generate NOxAmount sprays into substantial amounts of NH3, limited by field condition, part NH3Fail to participate in reaction completely thus cause certain density the escaping of ammonia, additionally, the catalyst in SCR system is to SO in flue gas2It is oxidized to SO3There is certain catalytic action, cause SO in SCR reactor2It is oxidized to SO3Amount can change in the range of 0.3～2%.
High-temperature flue gas enters downstream air preheater after reaction in SCR system and carries out heat exchange (general air preheater entrance flue gas temperature is 350～400 DEG C), heating boiler one secondary wind.After the heat exchange of the whole flow process of air preheater, air preheater cold side outlet flue gas mean temperature is typically reduced to 130～160 DEG C, the SO in period flue gas3Condense, thus exchange hot side and cause corrosion, meanwhile, the SO condensed in flue gas3And NH3Reaction generates NH4HSO4, NH4HSO4Having the strongest viscosity, easily stick to air preheater heat exchanger fin surface, meanwhile, stronger viscosity the most easily adheres to the flying dust in flue gas, thus causes air preheater inlet outlet pressure differential to be gradually increased, blocks and gradually increase the weight of, and finally affects unit output.For air preheater blockage problem; power plant generally uses steam soot blowing or the modes such as steam air heater that come into operation to alleviate; on the one hand this affect unit economy increases coal consumption; on the other hand blockage problem cannot at all being solved; then need shutdown water under high pressure to be rinsed when blocking serious, have impact on unit load rate.
Existing technology is difficult to solve the problems referred to above, if publication date is on October 22nd, 1997, in the Chinese patent of Publication No. CN2265482, disclose a kind of blocking-resistance device for boiler air preheating, this blocking-resistance device for boiler air preheating is installed in air preheater, it is additionally arranged floating net frame for gear on air preheater top, by hanger spring, floating net frame for gear hung on air preheater top, ash disposal spring it is mounted with in air preheater smoke pipe, ash disposal lower spring end has lifted weight, flue gas perturbation action is utilized to make floating net frame for gear, ash disposal spring produces sink-float vibration, in sticking to fume pipe, flyash constantly strikes off, to reach the anti-blocking purpose of air preheater, but NH4HSO4Having the strongest viscosity, scraping effect is undesirable, and blocking-proof result is poor.
Based on above reason, for efficiently solving above-mentioned air preheater heated surface corrosion and the problem of blocking, new preventing and treating air preheater anticorrosion and the process system of blocking need to be developed.
Summary of the invention
The present invention is to effectively solve air preheater heat-transfer surface corrosion during coal-fired plant boiler (especially burning high sulfur coal burning boiler) runs and inlet outlet pressure differential is relatively big, blocking is the most serious problem, and then provides a kind of coal-burning power plant air preheater hot blast adverse current the most anti-blocking and the system of corrosion and technique thereof.
nullThe present invention solves the problems referred to above and be the technical scheme is that this anti-blocking and corrosion system of coal-burning power plant's air preheater hot blast adverse current includes trisector air heater、Heat exchanger fin、Cold First air pipeline、Cold secondary wind pipeline、Heat primary air pipeline and hot secondary wind pipeline，Described heat exchanger fin is positioned at trisector air heater，Described trisector air heater is provided with flue gas point storehouse、Wind separating bin and secondary air separating storehouse，The cold end of described cold First air pipeline and a wind separating bin connects，The hot junction of described heat primary air pipeline and a wind separating bin connects，Described cold secondary wind pipeline is connected with the cold end in secondary air separating storehouse，Described hot secondary wind pipeline is connected with the hot junction in secondary air separating storehouse，Described flue gas divides storehouse for connecting with flue，Its construction features is: also include heat primary air introduction pipe、Hot secondary wind introduction pipe、Heat primary air draws flow electric control valve、Hot secondary wind draws flow electric control valve、Hot blast introduces cold side conduits、Hot blast connecting pipe、Hot secondary wind booster fan and hot blast introduce hot secondary air box pipeline，Described trisector air heater is provided with a fanning strip，A described fanning strip includes being positioned at number fanning strip of cold end of the cold end of trisector air heater and being positioned at hot junction one fanning strip in trisector air heater hot junction，An independent adverse current heating cabinet is formed between number fanning strip of described cold end and hot junction one fanning strip，Number fanning strip of described cold end is provided with cold end voltage stabilizing chamber，Described cold end pressure stabilizing cavity indoor are provided with hot blast deflector，Described cold end voltage stabilizing chamber is provided with a several hot air spout towards the one side of heat exchanger fin，Described hot junction one fanning strip is provided with hot junction pressure balance chamber，Described hot junction pressure balance chamber is provided with several No. two hot air spouts towards the one side of heat exchanger fin，One end of described heat primary air introduction pipe and heat primary air pipeline connect，The other end of this heat primary air introduction pipe and heat primary air are drawn flow electric control valve and are connected，Described hot blast introduces one end and the connection of cold end voltage stabilizing chamber of cold side conduits，This hot blast introduces one end of cold side conduits and faces hot blast deflector，Described hot blast introduces the other end and the heat primary air extraction flow electric control valve connection of cold side conduits，One end of described hot secondary wind introduction pipe and hot secondary wind pipeline connect，The other end of this hot secondary wind introduction pipe and hot secondary wind are drawn flow electric control valve and are connected，Described hot secondary wind draws flow electric control valve and hot blast connecting pipe connects，Described hot blast connecting pipe and hot secondary wind booster fan connect，Described hot secondary wind booster fan and hot blast introduce cold side conduits and connect，Described hot blast introduces one end and the connection of hot junction pressure balance chamber of hot secondary air box pipeline，This hot blast introduces the other end and the connection of hot secondary wind pipeline of hot secondary air box pipeline.
As preferably, the present invention is when the direction of rotation of trisector air heater is flue gas → First air → secondary wind, and described cold end voltage stabilizing chamber and hot junction pressure balance chamber are respectively positioned between flue gas point storehouse and secondary air separating storehouse；When the direction of rotation of trisector air heater is flue gas → secondary wind → First air, described cold end voltage stabilizing chamber and hot junction pressure balance chamber are respectively positioned between flue gas Fen Cang and a wind separating bin.
As preferably, a hot air spout of the present invention and No. two hot air spouts are slit shape structure.
As preferably, hot blast deflector of the present invention is airfoil structure, and the distance introducing cold side conduits in the middle of hot blast deflector to hot blast introduces the distance of cold side conduits more than hot blast deflector both sides to hot blast.
As preferably, hot blast deflector of the present invention is positioned at directly over the outlet of one end that hot blast introduces cold side conduits.
As preferably, number fanning strip of cold end of the present invention and hot junction one fanning strip are overlapping along the axial direction of trisector air heater.
As preferably, a fanning strip of the present invention is fixed on the central truss of trisector air heater.
As preferably, the width of cold end voltage stabilizing chamber of the present invention and hot junction pressure balance chamber is respectively less than the width between adjacent two apex seals of trisector air heater.
As preferably, in one end of hot blast of the present invention introducing cold side conduits and cold end voltage stabilizing chamber, the one side of heat exchanger fin connects dorsad, and in one end of the described hot blast hot secondary air box pipeline of introducing and hot junction pressure balance chamber, the one side of heat exchanger fin connects dorsad.
A kind of coal-burning power plant air preheater hot blast adverse current using described system to carry out is the most anti-blocking and the technique of corrosion, its feature is: the step of described technique is as follows: cold First air and cold secondary wind respectively by cold First air pipeline and cold secondary wind pipeline after trisector air heater heats, flow out along heat primary air pipeline and hot secondary wind pipeline respectively, when unit is when properly functioning, the heat primary air of partial high pressure is drawn from heat primary air introduction pipe, adjust to desired flow through heat primary air extraction flow electric control valve and introduce cold end voltage stabilizing chamber, heat exchanger fin is inversely sprayed into along flue gas again by a hot air spout, by hot blast adverse current heating, on the one hand the NH that the cold end of high-temperature evaporation trisector air heater generates4HSO4, on the other hand improve trisector air heater cold end integrated temperature, the NH that suppression generates4HSO4Prevent sulfuric acid vapor from condensing while frozen plug, also there is purging effect in the heat primary air exchange backing of high pressure simultaneously, finally introduce hot secondary air box pipeline through hot blast and cause hot secondary wind pipeline and enter burner hearth together with hot secondary wind and participate in burning, when coal-fired ature of coal be not very poor cause trisector air heater blocking less serious time, hot secondary wind draws flow electric control valve and hot secondary wind booster fan is in cutting out resting state, when coal-fired ature of coal is very poor cause trisector air heater blocking more to effectively cause primary air fan nominal output deficiency time, open hot secondary wind and draw flow electric control valve and hot secondary wind booster fan, thus open hot secondary wind and draw bypass, to increase hot blast rate.
The present invention compared with prior art, has the following advantages and effect: effectively solve the problem that during coal-fired plant boiler (especially burning high sulfur coal burning boiler) runs, the corrosion of air preheater heat-transfer surface and inlet outlet pressure differential are relatively big, blocking is the most serious.The present invention is by hot blast adverse current heating, the NH that on the one hand the cold end of high-temperature evaporation generates4HSO4, on the other hand can improve air preheater cold end integrated temperature, the NH that suppression generates4HSO4Prevent sulfuric acid vapor from condensing while frozen plug, also there is purging effect in high-pressure hot wind heat exchanging element simultaneously, can effectively solve, with this, the problem that in coal-fired plant boiler (especially burning high sulfur coal burning boiler) running, the corrosion of air preheater heat-transfer surface and inlet outlet pressure differential are relatively big, blocking is the most serious.Additionally, install flue gas heat-exchange unit by afterbody, the energy loss that can the raising of air preheater exhaust gas temperature be caused reclaims, it is achieved the purpose that flue gas energy recovery utilizes.
Accompanying drawing explanation
Fig. 1 is that in the embodiment of the present invention, coal-burning power plant's air preheater hot blast adverse current is the most anti-blocking and the structural representation of system of corrosion.
Fig. 2 is the structural representation of trisector air heater in the embodiment of the present invention.
Fig. 3 be in Fig. 2 A to structural representation.
Fig. 4 is the structural representation of a cold number fanning strip of end in the embodiment of the present invention.
Fig. 5 be in Fig. 4 B to structural representation.
Fig. 6 is the sectional structure schematic diagram in D-D face in Fig. 4.
Fig. 7 is the sectional structure schematic diagram in C-C face in Fig. 5.
Fig. 8 is the structural representation of number fanning strip in hot junction in the embodiment of the present invention.
Fig. 9 be in Fig. 8 E to structural representation.
Figure 10 is the sectional structure schematic diagram in F-F face in Fig. 8.
Figure 11 is the sectional structure schematic diagram in G-G face in Fig. 9.
Figure 12 is flue gas point storehouse and the upstream region cold side outlet circumference Temperature of Working distribution schematic diagram of trisector air heater in the embodiment of the present invention.
Figure 13 is the structural representation of flue gas waste heat recovery system in the embodiment of the present invention.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following example are explanation of the invention and the invention is not limited in following example.
Embodiment.
Seeing Fig. 1 to Figure 13, in the present embodiment, anti-blocking and corrosion the system of coal-burning power plant's air preheater hot blast adverse current includes that trisector air heater 1, heat exchanger fin 2, cold First air pipeline 7, cold secondary wind pipeline 8, heat primary air pipeline 9, hot secondary wind pipeline 10, heat primary air introduction pipe 11, hot secondary wind introduction pipe 12, heat primary air draw flow electric control valve 13, hot secondary wind draws flow electric control valve 14, hot blast introduces cold side conduits 15, hot blast connecting pipe 16, hot secondary wind booster fan 17 and hot blast and introduces hot secondary air box pipeline 18.
Heat exchanger fin 2 in the present embodiment is positioned at trisector air heater 1, trisector air heater 1 is provided with flue gas Fen Cang, a wind separating bin and secondary air separating storehouse, cold First air pipeline 7 is connected with the cold end of a wind separating bin, heat primary air pipeline 9 is connected with the hot junction of a wind separating bin, cold secondary wind pipeline 8 is connected with the cold end in secondary air separating storehouse, hot secondary wind pipeline 10 is connected with the hot junction in secondary air separating storehouse, and flue gas point storehouse is for connecting with flue 21.
Trisector air heater 1 in the present embodiment is provided with a fanning strip 3, a number fanning strip 3 includes being positioned at number fanning strip 3-1 of cold end of the cold end of trisector air heater 1 and being positioned at the hot junction one fanning strip 3-2 in trisector air heater 1 hot junction, forms an independent adverse current heating cabinet between number fanning strip 3-1 of cold end and hot junction one fanning strip 3-2.
Number fanning strip 3-1 of cold end in the present embodiment is provided with cold end voltage stabilizing chamber 6, it is provided with hot blast deflector 29 in cold end voltage stabilizing chamber 6, cold end voltage stabilizing chamber 6 is provided with a several hot air spout 30 towards the one side of heat exchanger fin 2, hot junction one fanning strip 3-2 is provided with hot junction pressure balance chamber 5, and hot junction pressure balance chamber 5 is provided with several No. two hot air spouts 31 towards the one side of heat exchanger fin 2.
nullOne end and the heat primary air pipeline 9 of the heat primary air introduction pipe 11 in the present embodiment connect，The other end of this heat primary air introduction pipe 11 and heat primary air are drawn flow electric control valve 13 and are connected，One end and the cold end voltage stabilizing chamber 6 of hot blast introducing cold side conduits 15 connect，This hot blast introduces one end of cold side conduits 15 and faces hot blast deflector 29，The other end of hot blast introducing cold side conduits 15 and heat primary air are drawn flow electric control valve 13 and are connected，One end and the hot secondary wind pipeline 10 of hot secondary wind introduction pipe 12 connect，The other end of this hot secondary wind introduction pipe 12 and hot secondary wind are drawn flow electric control valve 14 and are connected，Hot secondary wind draws flow electric control valve 14 and hot blast connecting pipe 16 connects，Hot blast connecting pipe 16 and hot secondary wind booster fan 17 connect，Hot secondary wind booster fan 17 and hot blast introduce cold side conduits 15 and connect，One end and the hot junction pressure balance chamber 5 of the hot blast hot secondary air box pipeline 18 of introducing connect，The other end and the hot secondary wind pipeline 10 of this hot blast hot secondary air box pipeline 18 of introducing connect.
When the direction of rotation of trisector air heater 1 is flue gas → First air → secondary wind, cold end voltage stabilizing chamber 6 and hot junction pressure balance chamber 5 in the present embodiment are respectively positioned between flue gas point storehouse and secondary air separating storehouse；When the direction of rotation of trisector air heater 1 is flue gas → secondary wind → First air, cold end voltage stabilizing chamber 6 and hot junction pressure balance chamber 5 in the present embodiment are respectively positioned between flue gas Fen Cang and a wind separating bin.
A hot air spout 30 and No. two hot air spouts 31 in the present embodiment are slit shape structure.Hot blast deflector 29 is airfoil structure, and the distance introducing cold side conduits 15 in the middle of hot blast deflector 29 to hot blast introduces the distance of cold side conduits 15 more than hot blast deflector 29 both sides to hot blast.Hot blast deflector 29 is positioned at directly over the outlet of one end that hot blast introduces cold side conduits 15.Number fanning strip 3-1 of cold end and hot junction one fanning strip 3-2 is overlapping on the axial direction along trisector air heater 1.A number fanning strip 3 is fixed on the central truss 28 of trisector air heater 1.The width of cold end voltage stabilizing chamber 6 and hot junction pressure balance chamber 5 is respectively less than the width between adjacent two apex seals of trisector air heater 1.In one end of hot blast introducing cold side conduits 15 and cold end voltage stabilizing chamber 6, the one side of heat exchanger fin 2 connects dorsad, and in one end of the hot blast hot secondary air box pipeline 18 of introducing and hot junction pressure balance chamber 5, the one side of heat exchanger fin 2 connects dorsad.
Coal-burning power plant air preheater hot blast adverse current in the present embodiment is the most anti-blocking and the step of the technique of corrosion is as follows: cold First air and cold secondary wind respectively by cold First air pipeline 7 and cold secondary wind pipeline 8 after trisector air heater 1 heating, flow out along heat primary air pipeline 9 and hot secondary wind pipeline 10 respectively, when unit is when properly functioning, by heat primary air (the about 10kPa of partial high pressure, 350 DEG C) draw from heat primary air introduction pipe 11, adjust to desired flow through heat primary air extraction flow electric control valve 13 and introduce cold end voltage stabilizing chamber 6, heat exchanger fin 2 is inversely sprayed into along flue gas again by a hot air spout 30, by hot blast adverse current heating, on the one hand the NH that the cold end of high-temperature evaporation trisector air heater 1 generates4HSO4, on the other hand improve trisector air heater 1 cold end integrated temperature, the NH that suppression generates4HSO4Prevent sulfuric acid vapor from condensing while frozen plug, also there is purging effect in the heat primary air exchange backing 2 of high pressure simultaneously, finally introduce hot secondary air box pipeline 18 through hot blast and cause hot secondary wind pipeline 10 and enter burner hearth together with hot secondary wind and participate in burning, when coal-fired ature of coal be not very poor cause trisector air heater 1 to block less serious time, hot secondary wind draws flow electric control valve 14 and hot secondary wind booster fan 17 is in cutting out resting state, when coal-fired ature of coal is very poor cause trisector air heater 1 to block more effectively causing primary air fan nominal output deficiency time, open hot secondary wind and draw flow electric control valve 14 and hot secondary wind booster fan 17, thus open hot secondary wind and draw bypass, to increase hot blast rate.
Trisector air heater 1 usually three points of storehouse syntype structure rotary regenerative air preheaters of typical case in the present embodiment, being also provided with No. two fanning strips 4 on trisector air heater 1, No. two fanning strips 4 include No. two fanning strip 4-1 of cold end and hot junction two fanning strip 4-2.
Air preheater rotational order is flue gas → First air → secondary wind, voltage stabilizing chamber 6 is isolated near secondary wind side at fanning strip 3-1, the plane steel plate of the close heat exchanger fin 2 of voltage stabilizing chamber 6 is outputed slit shape spout 30, its opposite planar steel plate is outputed circular hot-wind inlet and is connected with hot blast introducing cold side conduits 15；Pressure balance chamber 5 is isolated near secondary wind survey at fanning strip 3-2, the plane steel plate of the close heat exchanger fin 2 of pressure balance chamber 5 is outputed slit shape spout 31, its opposite planar steel plate is outputed circular hot-blast outlet and is connected with the hot blast hot secondary air box pipeline 1 of introducing.
As shown in Fig. 4 to Figure 11, hot blast introduces cold side conduits 15 and the hot blast hot secondary air box pipeline 18 of introducing is divided into two-way and leads in/out cold end voltage stabilizing chamber 6 and hot junction pressure balance chamber 5, in cold end voltage stabilizing chamber 6, corresponding two-way hot blast introduces cold side conduits 15 and is respectively provided with the hot blast deflector 29 of aerofoil profile, the hot blast deflector 29 of two pieces of aerofoil profiles introduces the surface of cold side conduits 15 outlet respectively at two-way hot blast, essentially identical to realize each spout flow of a hot air spout 30 of each slit in cold end voltage stabilizing chamber 6.
As shown in Figure 12 and Figure 13, furnace outlet gas temperature flue gas enters trisector air heater 1 heat exchange through denitrating system 19, exiting flue gas after heat exchange flows through flue 21 and electric cleaner 22, increased owing to hot blast adverse current heel row cigarette temperature designs relatively, flue gas heat-exchange unit 24 is installed between air-introduced machine 23 and desulfurizing tower, partial coagulation water passes through an electric control valve 25, No. two electric control valves 26 and water circulating pump 27 are in flue gas heat-exchange unit 24 and after flue gas heat exchange, converge through the condensation water that low-pressure heater 20 heats with another part and flow through next stage heater, the purpose of flue gas heat recovery is realized with this.
Trisector air heater 1 rotational order in the present embodiment is flue gas → First air → secondary wind, cold end voltage stabilizing chamber 6 is isolated near secondary wind side at number fanning strip 3-1 of cold end, on the plane steel plate of heat exchanger fin 2, output a hot air spout 30 of slit shape at cold end voltage stabilizing chamber 6, its opposite planar steel plate is outputed circular hot-wind inlet and is connected with hot blast introducing cold side conduits 15.When the rotational order of trisector air heater 1 is flue gas → secondary wind → First air, only need to cold end voltage stabilizing chamber 6, hot junction pressure balance chamber 30, No. two hot air spouts 31 of 5, hot air spout be arranged in the fanning strip of a number fanning strip 3-2 radial symmetric of number fanning strip 3-1 of cold end and hot junction, its cold end voltage stabilizing chamber 6 and hot junction pressure balance chamber 5 also should be near First air sides.
The present embodiment is by hot blast adverse current heating, the NH that on the one hand the cold end of high-temperature evaporation generates4HSO4, on the other hand can improve air preheater cold end integrated temperature, the NH that suppression generates4HSO4Prevent sulfuric acid vapor from condensing while frozen plug, also there is purging effect in high-pressure hot wind heat exchanging element simultaneously, can effectively solve, with this, the problem that during coal-fired plant boiler (especially burning high sulfur coal burning boiler) runs, the corrosion of air preheater heat-transfer surface and inlet outlet pressure differential are relatively big, blocking is the most serious.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, be named title etc. can be different, and the above content described in this specification is only to present configuration example explanation.All equivalence changes done according to structure, feature and the principle described in inventional idea of the present invention or simple change, be all included in the protection domain of patent of the present invention.Described specific embodiment can be made various amendment or supplements or use similar mode to substitute by those skilled in the art; without departing from the structure of the present invention or surmount scope defined in the claims, protection scope of the present invention all should be belonged to.
Claims (10)
- null1. a coal-burning power plant air preheater hot blast adverse current is the most anti-blocking and the system of corrosion，Including trisector air heater (1)、Heat exchanger fin (2)、Cold First air pipeline (7)、Cold secondary wind pipeline (8)、Heat primary air pipeline (9) and hot secondary wind pipeline (10)，Described heat exchanger fin (2) is positioned at trisector air heater (1)，Described trisector air heater (1) is provided with flue gas point storehouse、Wind separating bin and secondary air separating storehouse，Described cold First air pipeline (7) is connected with the cold end of a wind separating bin，Described heat primary air pipeline (9) is connected with the hot junction of a wind separating bin，Described cold secondary wind pipeline (8) is connected with the cold end in secondary air separating storehouse，Described hot secondary wind pipeline (10) is connected with the hot junction in secondary air separating storehouse，Described flue gas divides storehouse for connecting with flue (21)，It is characterized in that: also include heat primary air introduction pipe (11)、Hot secondary wind introduction pipe (12)、Heat primary air draws flow electric control valve (13)、Hot secondary wind draws flow electric control valve (14)、Hot blast introduces cold side conduits (15)、Hot blast connecting pipe (16)、Hot secondary wind booster fan (17) and hot blast introduce hot secondary air box pipeline (18)，Described trisector air heater (1) is provided with a fanning strip (3)，A described fanning strip (3) includes number fanning strip (3-1) of cold end being positioned at trisector air heater (1) cold end and is positioned at hot junction one fanning strip (3-2) in trisector air heater (1) hot junction，An independent adverse current heating cabinet is formed between number fanning strip (3-1) of described cold end and hot junction one fanning strip (3-2)，Number fanning strip (3-1) of described cold end is provided with cold end voltage stabilizing chamber (6)，It is provided with hot blast deflector (29) in described cold end voltage stabilizing chamber (6)，Described cold end voltage stabilizing chamber (6) is provided with a several hot air spout (30) towards the one side of heat exchanger fin (2)，Described hot junction one fanning strip (3-2) is provided with hot junction pressure balance chamber (5)，Described hot junction pressure balance chamber (5) is provided with several No. two hot air spouts (31) towards the one side of heat exchanger fin (2)，One end of described heat primary air introduction pipe (11) and heat primary air pipeline (9) connect，The other end of this heat primary air introduction pipe (11) and heat primary air are drawn flow electric control valve (13) and are connected，Described hot blast introduces one end and the connection of cold end voltage stabilizing chamber (6) of cold side conduits (15)，This hot blast introduces one end of cold side conduits (15) and faces hot blast deflector (29)，Described hot blast introduces the other end and heat primary air extraction flow electric control valve (13) connection of cold side conduits (15)，One end of described hot secondary wind introduction pipe (12) and hot secondary wind pipeline (10) connect，The other end of this hot secondary wind introduction pipe (12) and hot secondary wind are drawn flow electric control valve (14) and are connected，Described hot secondary wind draws flow electric control valve (14) and hot blast connecting pipe (16) connects，Described hot blast connecting pipe (16) and hot secondary wind booster fan (17) connect，Described hot secondary wind booster fan (17) and hot blast introduce cold side conduits (15) and connect，Described hot blast introduces one end and hot junction pressure balance chamber (5) connection of hot secondary air box pipeline (18)，This hot blast introduces the other end and hot secondary wind pipeline (10) connection of hot secondary air box pipeline (18).
- Air preheater hot blast adverse current in coal-burning power plant the most according to claim 1 is the most anti-blocking and the system of corrosion, it is characterized in that: when the direction of rotation of trisector air heater (1) is flue gas → First air → secondary wind, described cold end voltage stabilizing chamber (6) and hot junction pressure balance chamber (5) are respectively positioned between flue gas point storehouse and secondary air separating storehouse；When the direction of rotation of trisector air heater (1) is flue gas → secondary wind → First air, described cold end voltage stabilizing chamber (6) and hot junction pressure balance chamber (5) are respectively positioned between flue gas Fen Cang and a wind separating bin.
- Air preheater hot blast adverse current in coal-burning power plant the most according to claim 1 is the most anti-blocking and the system of corrosion, it is characterised in that: a described hot air spout (30) and No. two hot air spouts (31) are slit shape structure.
- Air preheater hot blast adverse current in coal-burning power plant the most according to claim 1 is the most anti-blocking and the system of corrosion, it is characterized in that: described hot blast deflector (29) is airfoil structure, and the distance introducing cold side conduits (15) in the middle of hot blast deflector (29) to hot blast introduces the distance of cold side conduits (15) more than hot blast deflector (29) both sides to hot blast.
- Air preheater hot blast adverse current in coal-burning power plant the most according to claim 1 is the most anti-blocking and the system of corrosion, it is characterised in that: described hot blast deflector (29) is positioned at directly over the outlet of one end that hot blast introduces cold side conduits (15).
- Air preheater hot blast adverse current in coal-burning power plant the most according to claim 1 is the most anti-blocking and the system of corrosion, it is characterised in that: number fanning strip (3-1) of described cold end and hot junction one fanning strip (3-2) be overlap on the axial direction along trisector air heater (1).
- Air preheater hot blast adverse current in coal-burning power plant the most according to claim 1 is the most anti-blocking and the system of corrosion, it is characterised in that: a described fanning strip (3) is fixed on the central truss (28) of trisector air heater (1).
- Air preheater hot blast adverse current in coal-burning power plant the most according to claim 1 is the most anti-blocking and the system of corrosion, it is characterised in that: the width of described cold end voltage stabilizing chamber (6) and hot junction pressure balance chamber (5) is respectively less than the width between adjacent two apex seals of trisector air heater (1).
- Air preheater hot blast adverse current in coal-burning power plant the most according to claim 1 is the most anti-blocking and the system of corrosion, it is characterized in that: in one end of described hot blast introducing cold side conduits (15) and cold end voltage stabilizing chamber (6), the one side of heat exchanger fin (2) connects dorsad, in one end of the described hot blast hot secondary air box pipeline (18) of introducing and hot junction pressure balance chamber (5), the one side of heat exchanger fin (2) connects dorsad.
- null10. coal-burning power plant's air preheater hot blast adverse current that a kind uses system as described in claim 1～9 any claim to carry out is the most anti-blocking and the technique of corrosion，It is characterized in that: the step of described technique is as follows: cold First air and cold secondary wind respectively by cold First air pipeline (7) and cold secondary wind pipeline (8) after trisector air heater (1) heats，Flow out along heat primary air pipeline (9) and hot secondary wind pipeline (10) respectively，When unit is when properly functioning，The heat primary air of partial high pressure is drawn from heat primary air introduction pipe (11)，Adjust to desired flow through heat primary air extraction flow electric control valve (13) and introduce cold end voltage stabilizing chamber (6)，Heat exchanger fin (2) is inversely sprayed into along flue gas again by a hot air spout (30)，By hot blast adverse current heating，On the one hand the NH that high-temperature evaporation trisector air heater (1) cold end generates4HSO4, on the other hand improve trisector air heater (1) cold end integrated temperature, the NH that suppression generates4HSO4Prevent sulfuric acid vapor from condensing while frozen plug, also there is purging effect in heat primary air exchange backing (2) of high pressure simultaneously, finally introduce hot secondary air box pipeline (18) through hot blast and cause hot secondary wind pipeline (10) and enter burner hearth together with hot secondary wind and participate in burning, when coal-fired ature of coal be not very poor cause trisector air heater (1) blocking less serious time, hot secondary wind draws flow electric control valve (14) and hot secondary wind booster fan (17) is in cutting out resting state, when coal-fired ature of coal is very poor cause trisector air heater (1) blocking more to effectively cause primary air fan nominal output deficiency time, open hot secondary wind and draw flow electric control valve (14) and hot secondary wind booster fan (17), thus open hot secondary wind and draw bypass, to increase hot blast rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610295797.1A CN105972632B (en) | 2016-05-06 | 2016-05-06 | Air preheater hot wind adverse current in coal-burning power plant is anti-blocking and the system and its technique of corrosion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610295797.1A CN105972632B (en) | 2016-05-06 | 2016-05-06 | Air preheater hot wind adverse current in coal-burning power plant is anti-blocking and the system and its technique of corrosion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105972632A true CN105972632A (en) | 2016-09-28 |
| CN105972632B CN105972632B (en) | 2018-08-07 |
Family
ID=56992006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610295797.1A Active CN105972632B (en) | 2016-05-06 | 2016-05-06 | Air preheater hot wind adverse current in coal-burning power plant is anti-blocking and the system and its technique of corrosion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105972632B (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107559876A (en) * | 2017-09-04 | 2018-01-09 | 孙孝禹 | The reduction of rotary regenerative air preheater is leaked out anti-blocking ash system and method |
| CN107726355A (en) * | 2017-09-11 | 2018-02-23 | 大唐东北电力试验研究所有限公司 | Rotary regenerative air preheater and its First air side subtract the obstruction-proof method that leaks out |
| CN107816732A (en) * | 2017-10-26 | 2018-03-20 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of air preheater cold end wall temperature adjusting means and method |
| CN107842874A (en) * | 2017-10-26 | 2018-03-27 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of primary and secondary air heat distribution regulating system and method |
| CN108050535A (en) * | 2018-01-25 | 2018-05-18 | 湖南省湘电试验研究院有限公司 | Station boiler rotary regenerative air preheater and flue gas-air heat-exchange system |
| CN110068024A (en) * | 2019-04-15 | 2019-07-30 | 国家电投集团电站运营技术（北京）有限公司 | A kind of cleaning system for preventing air preheater from blocking |
| CN110160080A (en) * | 2019-05-13 | 2019-08-23 | 南京兆能节能科技有限公司 | A kind of rotary regenerative air preheater boosting type control block apparatus and its control blocking method |
| CN110848729A (en) * | 2019-10-18 | 2020-02-28 | 华电电力科学研究院有限公司 | Rotary air preheater blockage prevention and control system and working method thereof |
| CN111271726A (en) * | 2020-03-20 | 2020-06-12 | 西安热工研究院有限公司 | Air preheater inlet and outlet flue gas-air heat exchange system |
| CN111306567A (en) * | 2020-02-20 | 2020-06-19 | 华电电力科学研究院有限公司 | Hot air positive pressure blowing system for inhibiting blockage of air preheater and working method thereof |
| CN112128793A (en) * | 2020-07-31 | 2020-12-25 | 华电电力科学研究院有限公司 | Blockage clearing system and method for air preheater |
| CN112577064A (en) * | 2020-11-11 | 2021-03-30 | 湖南华电常德发电有限公司 | Air preheater anti-blocking structure capable of introducing hot air in sections and working method thereof |
| CN112902218A (en) * | 2021-01-29 | 2021-06-04 | 浙江浙能兰溪发电有限责任公司 | Differential pressure control method and control device for air pre-heater of coal-fired power plant |
| CN113983488A (en) * | 2021-11-08 | 2022-01-28 | 国网山东省电力公司电力科学研究院 | Anti-blocking system and method for air preheater of coal-fired unit boiler |
| WO2023029303A1 (en) * | 2021-08-30 | 2023-03-09 | 浙江兴核智拓科技有限公司 | Anti-blocking system and anti-blocking method based on split ring round-robin heating for rotary heat exchanger |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201137957Y (en) * | 2007-10-19 | 2008-10-22 | 哈尔滨润河科技有限公司 | Follow-up type flexible sealing device of rotary regenerative air pre-heater |
| CN202253724U (en) * | 2011-08-26 | 2012-05-30 | 赵淑芬 | Wind sealing equipment for rotary type air preheater |
| CN104235816A (en) * | 2014-09-30 | 2014-12-24 | 上海援梦电力能源科技咨询中心 | Pulverizing coal and sludge co-combustion environment-friendly power generation system provided with fan mill and medium-speed mill |
| CN104949149A (en) * | 2015-06-29 | 2015-09-30 | 南京博沃科技发展有限公司 | Rotary air preheater dust-blocking-prevention synergy sealing method and system |
| CN205746958U (en) * | 2016-05-06 | 2016-11-30 | 华电电力科学研究院 | Air preheater hot blast adverse current in coal-burning power plant is the most anti-blocking and the system of corrosion |
-
2016
- 2016-05-06 CN CN201610295797.1A patent/CN105972632B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201137957Y (en) * | 2007-10-19 | 2008-10-22 | 哈尔滨润河科技有限公司 | Follow-up type flexible sealing device of rotary regenerative air pre-heater |
| CN202253724U (en) * | 2011-08-26 | 2012-05-30 | 赵淑芬 | Wind sealing equipment for rotary type air preheater |
| CN104235816A (en) * | 2014-09-30 | 2014-12-24 | 上海援梦电力能源科技咨询中心 | Pulverizing coal and sludge co-combustion environment-friendly power generation system provided with fan mill and medium-speed mill |
| CN104949149A (en) * | 2015-06-29 | 2015-09-30 | 南京博沃科技发展有限公司 | Rotary air preheater dust-blocking-prevention synergy sealing method and system |
| CN205746958U (en) * | 2016-05-06 | 2016-11-30 | 华电电力科学研究院 | Air preheater hot blast adverse current in coal-burning power plant is the most anti-blocking and the system of corrosion |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107559876A (en) * | 2017-09-04 | 2018-01-09 | 孙孝禹 | The reduction of rotary regenerative air preheater is leaked out anti-blocking ash system and method |
| CN107726355A (en) * | 2017-09-11 | 2018-02-23 | 大唐东北电力试验研究所有限公司 | Rotary regenerative air preheater and its First air side subtract the obstruction-proof method that leaks out |
| CN107816732A (en) * | 2017-10-26 | 2018-03-20 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of air preheater cold end wall temperature adjusting means and method |
| CN107842874A (en) * | 2017-10-26 | 2018-03-27 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of primary and secondary air heat distribution regulating system and method |
| CN108050535A (en) * | 2018-01-25 | 2018-05-18 | 湖南省湘电试验研究院有限公司 | Station boiler rotary regenerative air preheater and flue gas-air heat-exchange system |
| CN108050535B (en) * | 2018-01-25 | 2024-03-22 | 湖南省湘电试验研究院有限公司 | Rotary air preheater for power station boiler and flue gas-air heat exchange system |
| CN110068024A (en) * | 2019-04-15 | 2019-07-30 | 国家电投集团电站运营技术（北京）有限公司 | A kind of cleaning system for preventing air preheater from blocking |
| CN110160080A (en) * | 2019-05-13 | 2019-08-23 | 南京兆能节能科技有限公司 | A kind of rotary regenerative air preheater boosting type control block apparatus and its control blocking method |
| CN110160080B (en) * | 2019-05-13 | 2020-03-31 | 南京兆能节能科技有限公司 | Pressurization type blockage control device and method for rotary air preheater |
| CN110848729A (en) * | 2019-10-18 | 2020-02-28 | 华电电力科学研究院有限公司 | Rotary air preheater blockage prevention and control system and working method thereof |
| CN111306567A (en) * | 2020-02-20 | 2020-06-19 | 华电电力科学研究院有限公司 | Hot air positive pressure blowing system for inhibiting blockage of air preheater and working method thereof |
| CN111271726A (en) * | 2020-03-20 | 2020-06-12 | 西安热工研究院有限公司 | Air preheater inlet and outlet flue gas-air heat exchange system |
| CN112128793A (en) * | 2020-07-31 | 2020-12-25 | 华电电力科学研究院有限公司 | Blockage clearing system and method for air preheater |
| CN112577064A (en) * | 2020-11-11 | 2021-03-30 | 湖南华电常德发电有限公司 | Air preheater anti-blocking structure capable of introducing hot air in sections and working method thereof |
| CN112577064B (en) * | 2020-11-11 | 2023-04-28 | 湖南华电常德发电有限公司 | Air preheater anti-blocking structure with hot air introduced in sections and working method thereof |
| CN112902218A (en) * | 2021-01-29 | 2021-06-04 | 浙江浙能兰溪发电有限责任公司 | Differential pressure control method and control device for air pre-heater of coal-fired power plant |
| CN112902218B (en) * | 2021-01-29 | 2024-07-02 | 浙江浙能兰溪发电有限责任公司 | Differential pressure control method and device for air preheater of coal-fired power plant |
| WO2023029303A1 (en) * | 2021-08-30 | 2023-03-09 | 浙江兴核智拓科技有限公司 | Anti-blocking system and anti-blocking method based on split ring round-robin heating for rotary heat exchanger |
| CN113983488A (en) * | 2021-11-08 | 2022-01-28 | 国网山东省电力公司电力科学研究院 | Anti-blocking system and method for air preheater of coal-fired unit boiler |
| CN113983488B (en) * | 2021-11-08 | 2024-04-09 | 国网山东省电力公司电力科学研究院 | Anti-blocking system and method for air preheater of coal-fired unit boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105972632B (en) | 2018-08-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105972632A (en) | System and process for protecting air preheater of coal-fired power plant from blockage and corrosion through hot-air counterflow | |
| CN105864817B (en) | The anti-AH of hot Secondary Air supercharging adverse current is blocked and heat-transfer surface etching system and its method | |
| CN105864816A (en) | System and method for inhibiting AH blockage due to ABS solidification through hot primary air countercurrent circulation | |
| CN104949149B (en) | A kind of method and its system of the anti-blocking ash collaboration sealing of rotary regenerative air preheater | |
| CN202769692U (en) | Thermodynamic system for coal-fired power plant boiler flue gas waste heat recovery and waste emission reduction | |
| CN205746958U (en) | Air preheater hot blast adverse current in coal-burning power plant is the most anti-blocking and the system of corrosion | |
| CN101140072A (en) | Desulfurize flue gas waste heat recovery system used in fire coal electric generating set | |
| CN105937773A (en) | Power station boiler condensing flue gas dehumidification and purification energy-saving system | |
| CN205535924U (en) | Rotation air preheater flue gas prevents against current that ammonium hydrogen sulfate blocks up device | |
| CN104266171A (en) | Flue gas waste heat utilization system of thermal power plant | |
| CN208566739U (en) | Rotary regenerative air preheater heat accumulating element control block apparatus and rotary regenerative air preheater | |
| CN108469036A (en) | Corrosion-and blocking-prevention automatically cleaning vertical tubular air preheater | |
| CN205383589U (en) | Novel energy -efficient application system of afterbody flue gas heat energy set | |
| CN205746956U (en) | The system of heat primary air circulated in countercurrent suppression ABS frozen plug AH | |
| CN201103915Y (en) | Desulfurized flue gas waste heat recovery system for fire coal generator set | |
| CN204739615U (en) | Regenerative air preheater prevents stifled ash sealing system in coordination | |
| CN207262470U (en) | Rotary regenerative air preheater | |
| CN204593353U (en) | A kind of integrated system of deep exploitation residual heat from boiler fume | |
| CN102620310B (en) | Air pre-heater system preventing low-temperature corrosion and air pre-heating method | |
| CN208075008U (en) | Corrosion-and blocking-prevention automatically cleaning vertical tubular air preheater | |
| CN208735652U (en) | The eliminating white smoke system that a kind of heat exchanger and air preheater combine | |
| CN205746957U (en) | The anti-AH blocking of hot secondary wind supercharging adverse current and heat-transfer surface etching system | |
| CN106123606A (en) | Sintering circular-cooler exhaust heat utilization system | |
| CN104235825A (en) | Boiler flue gas waste heat recycling system | |
| CN105889963B (en) | A kind of heat-exchanger rig for wet desulfurization system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |