CN101566351A - Flue gas system for unbalance control of flue gas flow - Google Patents
Flue gas system for unbalance control of flue gas flow Download PDFInfo
- Publication number
- CN101566351A CN101566351A CNA200910022348XA CN200910022348A CN101566351A CN 101566351 A CN101566351 A CN 101566351A CN A200910022348X A CNA200910022348X A CN A200910022348XA CN 200910022348 A CN200910022348 A CN 200910022348A CN 101566351 A CN101566351 A CN 101566351A
- Authority
- CN
- China
- Prior art keywords
- air preheater
- flue gas
- flue
- exhaust gases
- gases passes
- 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
Images
Classifications
-
- 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
Abstract
The invention relates to a flue gas system for unbalance control of flue gas flow, which comprises an air preheater, an air preheater outlet flue and an air preheater inlet flue which are communicated with the air preheater. N partition boards are arranged in the air preheater inlet flue to partition the air preheater inlet flue into N+1 small flue gas passages in which N adjusting doors are arranged. By adjusting the flue gas flow through the adjusting doors, the flue gas flow flowing through the air preheater forms certain deviation according to the metal temperature variation of a heat storage plate, namely when the metal temperature of the heat storage plate is lower, the heat transfer temperature pressure with the flue gas is larger, and the flue gas flow flowing through the surface of the air preheater is relatively large; and when the metal temperature of the heat storage plate is raised in the flue gas passage along with the rotation of the air preheater, the flue gas flow flowing through the surface of the air preheater is relatively reduced.
Description
Technical field
The present invention relates to the flue gas system of station boiler, be specifically related to the flue gas system of a kind of station boiler with the non-equilibrium control of flue gas flow.
Background technology
Along with the application of rotary regenerative air preheater and the capacity development of power station unit, the flue-gas temperature distribution bias of air preheater exhaust pass is increasing.With certain 1000MW unit boiler is example, its air preheater exhaust gases passes upper end (turns to differentiation by air preheater, rotor partly is the upper end from the exhaust gases passes that air side at first is transferred to, the part that changes over to after the upper end is the lower end, down together) the outlet flue gas is minimum, its temperature is lower more than 40 ℃ than exhaust gases passes outlet lower end, than low about 20 ℃ of average flue-gas temperature.This Temperature Distribution is totally unfavorable to reducing exhaust gas temperature, because when flue-gas temperature was lower than its certain value below acid dew-point temperature, serious cold end corrosion and stifled ash can appear in air preheater.When flue-gas temperature is evenly distributed, as long as exhaust gas temperature is more than this is worth.But when serious uneven distribution appears in flue-gas temperature, exhaust gas temperature is controlled at certain by the flue gas mean temperature to be worth when above, the cold end corrosion and stifled ash of air preheater then can occur than the low-temperature region of low about 20 ℃ of mean temperature, and finally cause the cold end corrosion and stifled ash of air preheater; Exhaust gas temperature is controlled by the temperature in minimum temperature zone, and exhaust gas temperature exceeds about 20 ℃ when being evenly distributed than flue-gas temperature, makes boiler thermal output reduce more than 1%.
In existing flue gas system, air preheater is imported and exported has only an exhaust gases passes, flue gas flows through the heat accumulation plate of rotary regenerative air preheater equably, along turning to of air preheater, in exhaust gases passes, the heat accumulation plate metal temperature of air preheater constantly raises, from exhaust gases passes upper end to the lower end, the exit gas temperature of air preheater is then more and more higher, thereby causes the flue-gas temperature deviation of air preheater outlet.This phenomenon is insurmountable in existing flue gas system and device thereof.
From the heat exchange principle, when the heat accumulation plate of air preheater rotor when air side forwards fume side to, at exhaust gases passes topmost, the metal temperature of heat accumulation plate is minimum, with the heat transfer temperature and pressure maximum of flue gas, heat exchange is the strongest.Subsequently, along with the rotation of rotor, the metal temperature of its heat accumulation plate progressively raises, and the heat transfer temperature and pressure of itself and flue gas are then more and more littler, and the heat exchange effect also worse and worse.This shows, the single flue balance is distributed the temperature changing regularity of flue gas flow and air preheater heat accumulation plate and is not matched, make the heat exchange effect of heat accumulation plate and flue gas not reach best, therefore, heat transfer temperature and pressure reasonable distribution flue gas flow according to heat accumulation plate and flue gas can be obtained better heat exchange effect, thereby reaches the purpose that reduces exhaust gas temperature.
From the cold end corrosion and stifled grey principle of prevention air preheater, single flue flue gas flow balance is distributed makes the air preheater heat accumulation plate minimum in the top of its exhaust gases passes temperature, and its exit gas temperature is also minimum, the easiest cold end corrosion and the stifled ash of causing.For the cold end corrosion and stifled ash that prevents air preheater, must guarantee that air preheater exhaust gases passes exit gas temperature topmost more than the acid dew-point temperature numerical value, like this, raises exhaust gas temperature at it, boiler thermal output reduces.If the flue gas mean temperature is controlled at it below acid dew-point temperature value,, can cause the cold end corrosion and stifled ash of air preheater though exhaust gas temperature is reduced.This contradiction is insurmountable in existing flue gas system.
The essence that the problems referred to above occur is that existing air preheater list import exhaust gases passes can only balance distribute flue gas flow, and can't regulate artificially, therefore, in existing flue gas system and device thereof is to solve the bigger problem of air preheater exit gas temperature distribution bias, also can't improve the heat exchange efficiency of air preheater.This shows, address the above problem that effective method is to be in operation can control flue gas flow artificially and distribute, so that reasonably carry out the non-equilibrium control (by test to obtain the optimal flow rate deviation profile) of flue gas flow according to actual conditions.This just need improve existing flue gas system, and flue-gas temperature distributes and relative low exhaust gas temperature so that obtain relatively uniformly in the air preheater outlet.This is to reducing exhaust gas temperature, and the cold end corrosion of prevention air preheater and stifled ash improve station boiler safety in operation and economy and have great practical significance.
Summary of the invention
The objective of the invention is to overcome the above-mentioned shortcoming of existing flue gas system, a kind of flue gas system that can regulate the non-equilibrium control of flue gas flow of each passage flue gas flow of fume side is provided.This system is in operation and can finally reaches the purpose that reduces exhaust gas temperature and improve its Temperature Distribution by the adjustment to N+1 passage flue gas flow.
For achieving the above object, the technical solution used in the present invention is: the air preheater exhaust pass and the air preheater inlet flue duct that comprise air preheater and be connected with air preheater, in the air preheater inlet flue duct, be provided with N demarcation strip, by N demarcation strip the air preheater inlet flue duct is divided into N+1 flue gas passage aisle, in N flue gas passage aisle, also is furnished with N adjustment doors.
The present invention is by N demarcation strip, the air preheater inlet flue duct is divided into N+1 passage, and on N passage, adjustment doors is installed, by adjusting the adjustment doors of N little exhaust gases passes, make the metal temperature variation formation certain deviation of the flue gas flow of the air preheater of flowing through according to heat accumulation plate.Promptly when the heat accumulation plate metal temperature is low more, the heat transfer temperature and pressure of itself and flue gas are big more, its surperficial flue gas flow of flowing through is relatively also big more, when the metal temperature of heat accumulation plate when exhaust gases passes raises along with the air preheater rotation, its surperficial flue gas flow of flowing through is also done corresponding reduction.The heat exchange efficiency of flue gas and heat accumulation plate is improved; Simultaneously, can also improve the flue-gas temperature distribution of air preheater exhanst gas outlet.In addition, also can be according to the metal temperature Changing Pattern of air preheater heat accumulation plate, the flue-gas temperature of controlling the air preheater outlet artificially distributes, when the heat accumulation plate metal temperature is low, the exhanst gas outlet temperature controlled compare higher, after the heat accumulation plate metal temperature raises, then control the exhanst gas outlet temperature relatively low, with cold end corrosion and the stifled ash that solves air preheater.This shows that the main effect of non-equilibrium control system of flue gas flow and device is: (1) reduces exhaust gas temperature; (2) cold end corrosion of prevention air preheater and stifled ash, the steam air heater of alternative air and gas system or hot blast EGR to a certain extent; (3) the more important thing is that can be further reduction exhaust gas temperature has created condition, finally reach the purpose that improves unit operation security and economy.
Description of drawings
Fig. 1 has newly established 1 (being N=1) individual demarcation strip and adjustment doors for the embodiment of the invention 1, and little exhaust gases passes quantity is 2, and the flue gas system schematic diagram of the impartial non-equilibrium control of flue gas flow of dividing of flow area;
Fig. 2 has newly established 1 (being N=1) individual demarcation strip and adjustment doors for the embodiment of the invention 2, and little exhaust gases passes quantity is 2, and the flue gas system schematic diagram of 2 non-impartial non-equilibrium controls of flue gas flow of dividing of little exhaust gases passes flow area employing; In this system, be in the little exhaust gases passes of the little exhaust gases passes circulation area of air preheater exhaust gases passes upper end less than its lower end;
Fig. 3 has newly established 1 (being N=1) individual demarcation strip and adjustment doors for the embodiment of the invention 3, and little exhaust gases passes quantity is 2, and the flue gas system schematic diagram of 2 non-impartial non-equilibrium controls of flue gas flow of dividing of little exhaust gases passes flow area employing; In this system, be in the little exhaust gases passes of the little exhaust gases passes circulation area of air preheater exhaust gases passes upper end greater than its lower end;
Fig. 4 has newly established 2 (being N=2) individual demarcation strip and adjustment doors for the embodiment of the invention 4, and little exhaust gases passes quantity is 3, and the flue gas system schematic diagram of the impartial non-equilibrium control of flue gas flow of dividing of flow area;
Fig. 5 has newly established 2 (being N=2) individual demarcation strip and adjustment doors for the embodiment of the invention 5, and little exhaust gases passes quantity is 3, and the flue gas system schematic diagram of 3 non-impartial non-equilibrium controls of flue gas flow of dividing of little exhaust gases passes flow area employing; In this system, the little exhaust gases passes circulation area that is in air preheater exhaust gases passes upper end is successively less than two little exhaust gases passes of its lower end (be demarcation strip 4 form with former flue the relative minimum of little exhaust gases passes flow area);
Fig. 6 has newly established 2 (being N=2) individual demarcation strip and adjustment doors for the embodiment of the invention 6, and little exhaust gases passes quantity is 3, and the flue gas system schematic diagram of 3 non-impartial non-equilibrium controls of flue gas flow of dividing of little exhaust gases passes flow area employing; In this system, the little exhaust gases passes circulation area that is in air preheater exhaust gases passes upper end is successively greater than two little exhaust gases passes of its lower end (be demarcation strip 4 form with former flue the relative maximum of little exhaust gases passes flow area);
Fig. 7 has newly established 3 (being N=3) individual demarcation strip and adjustment doors for the embodiment of the invention 7, and little exhaust gases passes quantity is 4, and the flue gas system schematic diagram of the impartial non-equilibrium control of flue gas flow of dividing of flow area;
Fig. 8 has newly established 3 (being N=3) individual demarcation strip and adjustment doors for the embodiment of the invention 8, and little exhaust gases passes quantity is 4, and the flue gas system schematic diagram of 4 non-impartial non-equilibrium controls of flue gas flow of dividing of little exhaust gases passes flow area employing; In this system, the little exhaust gases passes circulation area that is in air preheater exhaust gases passes upper end is successively less than three little exhaust gases passes of its lower end (be demarcation strip 4 form with former flue the relative minimum of little exhaust gases passes flow area);
Fig. 9 has newly established 3 (being N=3) individual demarcation strip and adjustment doors for the embodiment of the invention 9, and little exhaust gases passes quantity is 4, and the flue gas system schematic diagram of 4 non-impartial non-equilibrium controls of flue gas flow of dividing of little exhaust gases passes flow area employing; In this system and device, the little exhaust gases passes circulation area that is in air preheater exhaust gases passes upper end is successively greater than three little exhaust gases passes of its lower end (be demarcation strip 4 form with former flue the relative maximum of little exhaust gases passes flow area);
Figure 10 has newly established 4 (being N=4) individual demarcation strip and adjustment doors for the embodiment of the invention 10, and little exhaust gases passes quantity is 5, and the flue gas system schematic diagram of the impartial non-equilibrium control of flue gas flow of dividing of flow area:
Figure 11 has newly established 5 (being N=5) individual demarcation strip and adjustment doors for the embodiment of the invention 11, and little exhaust gases passes quantity is 6, and the flue gas system schematic diagram of the impartial non-equilibrium control of flue gas flow of dividing of flow area;
Figure 12 has newly established 6 (being N=6) individual demarcation strip and adjustment doors for the embodiment of the invention 12, and little exhaust gases passes quantity is 7, and the flue gas system schematic diagram of the impartial non-equilibrium control of flue gas flow of dividing of flow area;
Figure 13 has newly established 7 (being N=7) individual demarcation strip and adjustment doors for the embodiment of the invention 12, and little exhaust gases passes quantity is 8, and the flue gas system schematic diagram of the impartial non-equilibrium control of flue gas flow of dividing of flow area;
Figure 14 has newly established 8 (being N=8) individual demarcation strip and adjustment doors for the embodiment of the invention 14, and little exhaust gases passes quantity is 9, and the flue gas system schematic diagram of the impartial non-equilibrium control of flue gas flow of dividing of flow area;
Figure 15 has newly established 9 (being N=9) individual demarcation strip and adjustment doors for the embodiment of the invention 15, and little exhaust gases passes quantity is 10, and the flue gas system schematic diagram of the impartial non-equilibrium control of flue gas flow of dividing of flow area.
Number in the figure is represented respectively: 1, air preheater, 2, the air preheater exhaust pass, 3, the air preheater inlet flue duct, 4, demarcation strip, 5, second demarcation strip, the 6, the 3rd demarcation strip, the 7, the 4th demarcation strip, 8, the 5th demarcation strip 5,9, the 6th demarcation strip, the 10, the 7th demarcation strip, the 11, the 8th demarcation strip, 12, the 9th demarcation strip, 13, adjustment doors, 14, second adjustment doors, the 15, the 3rd adjustment doors, 16, the 4th adjustment doors, 17, the 5th adjustment doors, the 18, the 6th adjustment doors, the 19, the 7th adjustment doors, 20, the 8th adjustment doors, the 21, the 9th adjustment doors.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Embodiment 1: referring to Fig. 1, present embodiment comprises air preheater 1 and air preheater exhaust pass 2 that is connected with air preheater 1 and air preheater inlet flue duct 3, in air preheater inlet flue duct 3, be provided with a demarcation strip 4, this demarcation strip 4 is divided into the little exhaust gases passes that two circulation areas equate with air preheater inlet flue duct 3, also is provided with adjustment doors 13 on the little exhaust gases passes that is in air preheater exhaust gases passes lower end.Present embodiment has been newly established 1 demarcation strip 4 and adjustment doors 13 in original flue gas system, make flue gas before entering air preheater, be separated into two little exhaust gases passes, can be by the adjustment doors 13 that is installed in the little exhaust gases passes according to the flue gas flow of two little exhaust gases passes of operation needs adjusting, when effectively preventing the air preheater cold end corrosion and blocking up ash, reduce the exhaust gas temperature of boiler.
Embodiment 3: referring to Fig. 3, the demarcation strip 4 positions deflection of present embodiment turns to the little exhaust gases passes of the lower end of differentiation by air preheater, former flue is divided into the bottom flue that 2 circulation areas do not wait, and it is relatively little to be in the little exhaust gases passes flow area of air preheater exhaust gases passes lower end.Other annexation is with embodiment 1.
Embodiment 4: referring to Fig. 4, present embodiment is installed two demarcation strips in air preheater inlet flue duct 3, the demarcation strip 4 and second demarcation strip 5, simultaneously, demarcation strip 4 and and second demarcation strip, 5 equivalent arrangements in air preheater inlet flue duct 3, air preheater inlet flue duct 3 is divided into the little exhaust gases passes that 3 circulation areas equate.Also be provided with adjustment doors 13 and second adjustment doors 14, other annexation on 2 little exhaust gases passes that face mutually of air preheater exhaust gases passes lower end with embodiment 1 being in.
Embodiment 5: referring to Fig. 5, turn to differentiation by air preheater, the demarcation strip 4 of present embodiment and second demarcation strip, 5 positions are partial to the lower end certain distance respectively successively, air preheater inlet flue duct 3 is divided into the bottom flue that 2 circulation areas do not wait, and the little exhaust gases passes flow area that is in air preheater exhaust gases passes lower end is maximum relatively, middle little exhaust gases passes takes second place the flow area minimum of the little exhaust gases passes in upper end.Other annexation is with embodiment 4.
Embodiment 6: referring to Fig. 6, turn to differentiation by air preheater, the demarcation strip 4 of present embodiment and second demarcation strip 5 are partial to the upper end certain distance respectively successively, air preheater inlet flue duct 3 is divided into the bottom flue that 3 circulation areas do not wait, and the little exhaust gases passes flow area that is in air preheater commentaries on classics exhaust gases passes lower end is minimum relatively, middle little exhaust gases passes is placed in the middle, the flow area maximum of the little exhaust gases passes in upper end.Other annexation is with embodiment 4.
Embodiment 7: referring to Fig. 7, present embodiment is installed three demarcation strips in air preheater inlet flue duct 3, demarcation strip 4, second and third demarcation strip 5,6, demarcation strip 4, second and third demarcation strip 5,6 equivalent arrangements are divided into the bottom flue that 4 circulation areas equate at this section with air preheater inlet flue duct 3 in air preheater inlet flue duct 3.Also be provided with adjustment doors 13, second and third adjustment doors 14,15 on 3 continuous little exhaust gases passes of air preheater exhaust gases passes lower end, other annexation is with embodiment 1.
Embodiment 8: referring to Fig. 8, turn to differentiation by air preheater, the demarcation strip 4 of present embodiment, second and third demarcation strip 5 and 6 positions are partial to air preheater exhaust gases passes lower end certain distance respectively successively, air preheater inlet flue duct 3 is divided into the bottom flue that 4 circulation areas do not wait, to its upper end, the flow area of little exhaust gases passes reduces successively from air preheater exhaust gases passes lower end.Other annexation is with embodiment 1.
Embodiment 9: referring to Fig. 9, turn to differentiation by air preheater, the demarcation strip 4 of present embodiment, second and third demarcation strip 5 and 6 positions are partial to air preheater exhaust gases passes upper end certain distance respectively successively, air preheater inlet flue duct 3 is divided into the bottom flue that 4 circulation areas do not wait, to its upper end, the flow area of little exhaust gases passes increases successively from air preheater exhaust gases passes lower end.Other annexation is with embodiment 1.
Embodiment 10: referring to Figure 10, present embodiment is installed four demarcation strips in air preheater inlet flue duct 3, be demarcation strip 4, second and third, four demarcation strips 5,6,7, simultaneously, these four demarcation strip equalizations are positioned at air preheater inlet flue duct 3, at this section former flue are divided into the bottom flue that 5 circulation areas equate.Also be provided with on 4 little exhaust gases passes that air preheater exhaust gases passes lower end links to each other adjustment doors 13, second and third, four adjustment doors 14,15 and 16, other annexation is with embodiment 1.
Embodiment 11: referring to Figure 11, present embodiment is equipped with five demarcation strips in air preheater inlet flue duct 3, the demarcation strip of newly establishing 4, second and third, four, five demarcation strips 5,6,7 and 8 equalizations are positioned at air preheater inlet flue duct 3, will former flue be divided into the bottom flue that 6 circulation areas equate at this section.Also be provided with on 5 little exhaust gases passes that air preheater exhaust gases passes lower end links to each other adjustment doors 13, second and third, four, five adjustment doors 14,15,16 and 17, other annexation is with embodiment 1.
Embodiment 12: referring to Figure 12, present embodiment is equipped with six demarcation strips in air preheater inlet flue duct 3, the demarcation strip of newly establishing 4, second and third, four, five, six demarcation strips 5,6,7,8 and 9 equalizations are positioned at air preheater inlet flue duct 3, will former flue be divided into the bottom flue that 7 circulation areas equate at this section.Also be provided with on six little exhaust gases passes that air preheater exhaust gases passes lower end links to each other adjustment doors 13, second and third, four, five, six adjustment doors 14,15,16,17 and 18, other annexation is with embodiment 1.
Embodiment 13: referring to Figure 13, present embodiment is equipped with seven demarcation strips in air preheater inlet flue duct 3, the demarcation strip of newly establishing 4, second and third, four, five, six, seven demarcation strips 5,6,7,8,9 and 10 equalizations are positioned at air preheater inlet flue duct 3, will former flue be divided into the bottom flue that 8 circulation areas equate at this section.Also be provided with on seven little exhaust gases passes that air preheater exhaust gases passes lower end links to each other adjustment doors 13, second and third, four, five, six, seven adjustment doors 14,15,16,17,18 and 19, other annexation is with embodiment 1.
Embodiment 14: referring to Figure 14, present embodiment is equipped with eight demarcation strips in air preheater inlet flue duct 3, the demarcation strip of newly establishing 4, second and third, four, five, six, seven, eight demarcation strips 5,6,7,8,9,10 and 11 equalizations are positioned at air preheater inlet flue duct 3, will former flue be divided into the bottom flue that 9 circulation areas equate at this section.Also be provided with on eight little exhaust gases passes that air preheater exhaust gases passes lower end links to each other adjustment doors 13, second and third, four, five, six, seven, eight adjustment doors 14,15,16,17,18,19 and 20, other annexation is with embodiment 1.
Embodiment 15: referring to Figure 15, present embodiment is equipped with nine demarcation strips in air preheater inlet flue duct 3, the demarcation strip of newly establishing 4, second and third, four, five, six, seven, eight, nine demarcation strips 5,6,7,8,9,10,11 and 12 equalizations are positioned at air preheater inlet flue duct 3, will former flue be divided into the bottom flue that 10 circulation areas equate at this section.Also be provided with on nine little exhaust gases passes that air preheater exhaust gases passes lower end links to each other adjustment doors 13, second and third, four, five, six, seven, eight, nine adjustment doors 14,15,16,17,18,19,20 and 21, other annexation is with embodiment 1.
The present invention sets up N demarcation strip on the original air preheater inlet flue duct of air preheater, be divided into N+1 little exhaust gases passes, and on N little exhaust gases passes, N adjustment doors is installed, only uneasy dress adjustment doors in 1 little exhaust gases passes of air preheater exhaust gases passes upper end can obtain big relatively flue gas flow to guarantee this passage.By regulating N adjustment doors, can regulate the flue gas flow of N+1 little exhaust gases passes, make the flue gas flow of the air preheater of flowing through form certain deviation, to adapt to the air preheater heat accumulation plate metal rule that temperature progressively raises in exhaust gases passes rotates, relative with heat accumulation plate heat transfer temperature and pressure when big at flue gas, flue gas flow is also big relatively; Relative hour of flue gas and heat accumulation plate heat transfer temperature and pressure, flue gas flow is also relatively little.Like this, in actual motion,, can obtain better heat exchange effect between flue gas and the heat accumulation plate, reduce exhaust gas temperature by adjusting; The more important thing is that the flue-gas temperature that can improve the air preheater outlet distributes, and the flue-gas temperature of controlling the air preheater exhaust pass artificially distribute (when air preheater heat accumulation plate metal temperature is minimum, make its exit gas temperature the highest), prevent air preheater cold end corrosion and stifled grey safety coefficient to improve, or create conditions for boiler further reduces exhaust gas temperature.
By the air preheater heat accumulation plate metal rule that temperature progressively raises in exhaust gases passes rotates, the reasonable distribution flue gas flow can improve total heat exchange efficiency of flue gas and heat accumulation plate, therefore, can reduce exhaust gas temperature.The more important thing is that relative with heat accumulation plate heat transfer temperature and pressure when big at flue gas, because heat transfer efficiency is always less than 100%, therefore, after increasing flue gas flow, its exit gas temperature must raise accordingly.Thereafter, because the metal temperature of heat accumulation plate raises, its flue gas and heat accumulation plate heat transfer temperature and pressure progressively reduce, and flue gas flow is also progressively reducing, and therefore, its flue-gas temperature will relatively progressively reduce.When formation heat accumulation plate metal temperature was low, its exit gas temperature was high relatively; When the heat accumulation plate metal temperature was high relatively, its flue-gas temperature was low relatively, was very beneficial for preventing the cold end corrosion and stifled ash of air preheater.This shows, after adopting non-equilibrium control system of flue gas flow and device thereof, turn to differentiation by air preheater, originally it is lower to be in exhaust gases passes upper end heat accumulation plate metal temperature, the place that exit gas temperature is relatively low, the all relative rising of its flue-gas temperature with the heat accumulation plate metal temperature, and the original heat accumulation plate metal temperature place higher, that exit gas temperature is high that compares, the heat accumulation plate metal temperature is still than higher, and exit gas temperature decreases relatively, thereby makes the both sides flue-gas temperature be tending towards average.The more important thing is: can control heat accumulation plate metal temperature and exhanst gas outlet temperature artificially, obviously improve pre-anti-low-temperature corrosion of air preheater and stifled grey ability.This shows: non-equilibrium control system of flue gas flow and device thereof are fully feasible in theory.Its essence is and utilize the heat accumulation plate metal temperature rule that metal temperature constantly raises in rotary course, obtaining the better heat exchange effect of air preheater distributes with more rational exit gas temperature, when improving air preheater heat exchange effect, improve its safety in operation.
In the boiler smoke system of existing employing rotary regenerative air preheater, has only an exhaust gases passes (being single channel), and more than 50% of the total circulation area of its circulation area duty gas preheater, therefore, the gas approach channel cross-sectional flow area is bigger, be very easy to be divided into N+1 passage, and on N passage, install adjustment doors.Because just in order to obtain the non-equilibrium control of flue gas flow, and the pressure reduction of flue gas is almost 0 between N+1 flue gas passage aisle, need not worry the mutual leakage of flue gas between N+1 the little exhaust gases passes, even leakage is arranged, its amount is also very little, and this reveals the runnability that can not influence air preheater.Therefore,, do not need the air preheater body is made any change, do not need to carry out encapsulation process yet as long as between air preheater inlet flue duct and air preheater interface, separate.Simultaneously, the air preheater exhaust pass need not to cut apart, and still is an exhaust gases passes.This shows: setting up the non-equilibrium control system of flue gas flow and installing is feasible in practice, and very simple, easy to implement.
After adopting non-equilibrium control system of flue gas flow and device thereof, on the air preheater inlet flue duct, set up adjustment doors.The resistance of flue gas system is slightly increased, but the resistance increase is very little.This shows, set up non-equilibrium control system of flue gas flow and device thereof and make little the increasing of power consumption of air-introduced machine, but, improved the security of air preheater operation simultaneously owing to can reduce exhaust gas temperature, therefore, can improve boiler thermal output with and the operation economy and security.
Exhaust gas temperature is with coal, season and round the clock, and unit load changes, after adopting the present invention, when unit during in the night underrun, if exhaust gas temperature is lower than pre-anti-low-temperature corrosion and blocks up the minimum temperature of ash with stifled ash requirement, then can distributing by the flue-gas temperature that non-equilibrium control system of flue gas flow and device thereof obtain to match with heat accumulation plate metal temperature Changing Pattern, (its exit gas temperature was relative high when the heat accumulation plate metal temperature was low, vice versa), at the exhaust gas temperature that totally do not raise, or even under the condition that reduces exhaust gas temperature, guarantee the safety in operation of air preheater; Otherwise; when the unit high load capacity moves down; when cold end corrosion that does not have air preheater and stifled ash; then can distribute flue gas flow and adjust by non-equilibrium control system of flue gas flow and device thereof; take all factors into consideration the effect of reduction exhaust gas temperature and the influence of power consumption recruitment, guarantee to obtain the energy-saving effect that the former income is lost greater than the latter.This shows that non-equilibrium control system of flue gas flow and device thereof can substitute the steam air heater of air and gas system or hot blast recirculating system etc. to a certain extent, play the effect of the cold end corrosion that effectively prevents air preheater and stifled ash; Simultaneously, also can reduce exhaust gas temperature, improve the security and the economy of unit operation.
The present invention is adapted to the coal-burning boiler of adopting rotary regenerative air preheater of the various combustion systems of various capacity.To the boiler that puts into operation, be easy to implement to transform, and do not increase any power-equipment; For newly-built unit boiler, adopt the present invention, exhaust gas temperature can be designed more reasonable, when reducing exhaust gas temperature, guarantee the safety in operation of air preheater.
Compare with the flue gas system of existing equipment, the technique effect that the present invention and utility model are brought is:
1, the flue-gas temperature that can obviously improve air preheater outlet distributes, and effectively prevents air preheater Cold end corrosion and stifled ash; And can improve the heat transfer effect of air preheater and flue gas, make exhaust gas temperature Slightly reduce, thereby when reaching the reduction exhaust gas temperature, the operation that has improved air preheater Security.
2, for new-built unit, by the application of the non-equilibrium control system of flue gas flow and device thereof, can Design more rational exhaust gas temperature, for further reducing exhaust gas temperature, improve the boiler thermal output wound Made condition.
3, for the active service unit, behind the non-equilibrium control system of flue gas flow and plant modification thereof, same The improvement project that can be further reduction exhaust gas temperature creates conditions.
4, for the active service boiler, can be according to actual motions such as coal, atmospheric temperature and unit load variations Situation is adjusted the flue gas flow of each little exhaust gases passes, realizes the non-equilibrium control and regulation of flue gas flow, Improve the cold end corrosion of prevention air preheater and stifled grey safety coefficient, and exhaust gas temperature is slightly fallen Low. To a certain extent steam air heater or hot blast EGR in the alternative boiler smoke wind system.
5, no matter be to be used for the design of newly-built unit boiler or the transformation of active service unit boiler, because after adopting non-equilibrium control system of flue gas flow and plant modification thereof, still can be by adjusting the balance control (promptly returning to original system) that obtains flue gas flow, therefore, its risk is 0.
6, be adapted to the active service and the newly-built coal-burning boiler of rotary regenerative air preheater of the various combustion systems of various capacity.
System of the present invention is very simple, and is easy to implement, and former air preheater flue external form need not changed; Do not need to increase power-equipment, be convenient to very much implement.
Claims (5)
1, the flue gas system of the non-equilibrium control of a kind of flue gas flow, comprise air preheater (1) and air preheater exhaust pass (2) that is connected with air preheater (1) and air preheater inlet flue duct (3), it is characterized in that: in air preheater inlet flue duct (3), be provided with N demarcation strip, by N demarcation strip air preheater inlet flue duct (3) is divided into N+1 flue gas passage aisle, in this flue gas passage aisle, also is furnished with N adjustment doors.
2, the flue gas system of the non-equilibrium control of flue gas flow according to claim 1 is characterized in that: number 1≤N≤9 of described demarcation strip.
3, the flue gas system of the non-equilibrium control of flue gas flow according to claim 1 is characterized in that: in described whole little exhaust gases passes, only be in the exhaust gases passes little exhaust gases passes topmost adjustment doors is not set.
4, the flue gas system of the non-equilibrium control of flue gas flow according to claim 1 is characterized in that: a described N demarcation strip evenly is arranged in the air preheater inlet flue duct (3), and is divided into N+1 little exhaust gases passes.
5, the flue gas system of the non-equilibrium control of flue gas flow according to claim 1 is characterized in that: a described N demarcation strip is heterogeneous to be arranged in the air preheater inlet flue duct (3), and is divided into N+1 little exhaust gases passes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910022348XA CN101566351B (en) | 2009-05-05 | 2009-05-05 | Flue gas system for unbalance control of flue gas flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910022348XA CN101566351B (en) | 2009-05-05 | 2009-05-05 | Flue gas system for unbalance control of flue gas flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101566351A true CN101566351A (en) | 2009-10-28 |
| CN101566351B CN101566351B (en) | 2011-01-26 |
Family
ID=41282635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910022348XA Expired - Fee Related CN101566351B (en) | 2009-05-05 | 2009-05-05 | Flue gas system for unbalance control of flue gas flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101566351B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213437A (en) * | 2011-07-11 | 2011-10-12 | 张家港格林沙洲锅炉有限公司 | Damped forced circulation exhaust gas economizer |
| CN105546562A (en) * | 2016-01-29 | 2016-05-04 | 上海久试电力技术有限公司 | Flue and control method for controlling smoke temperature and improvement method for flue |
| CN108224461A (en) * | 2018-01-29 | 2018-06-29 | 东方电气集团东方锅炉股份有限公司 | Flue-gas temperature step partition type air preheater system |
| CN112728579A (en) * | 2021-01-14 | 2021-04-30 | 湘潭大学 | High-efficient air heater with deashing and anticorrosion function |
| CN113654074A (en) * | 2021-08-27 | 2021-11-16 | 西安热工研究院有限公司 | Flue gas bin-bypass heat regeneration energy-saving system based on air preheater heat transfer deviation |
-
2009
- 2009-05-05 CN CN200910022348XA patent/CN101566351B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102213437A (en) * | 2011-07-11 | 2011-10-12 | 张家港格林沙洲锅炉有限公司 | Damped forced circulation exhaust gas economizer |
| CN105546562A (en) * | 2016-01-29 | 2016-05-04 | 上海久试电力技术有限公司 | Flue and control method for controlling smoke temperature and improvement method for flue |
| CN108224461A (en) * | 2018-01-29 | 2018-06-29 | 东方电气集团东方锅炉股份有限公司 | Flue-gas temperature step partition type air preheater system |
| CN112728579A (en) * | 2021-01-14 | 2021-04-30 | 湘潭大学 | High-efficient air heater with deashing and anticorrosion function |
| CN113654074A (en) * | 2021-08-27 | 2021-11-16 | 西安热工研究院有限公司 | Flue gas bin-bypass heat regeneration energy-saving system based on air preheater heat transfer deviation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101566351B (en) | 2011-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101566351B (en) | Flue gas system for unbalance control of flue gas flow | |
| CN105783579B (en) | Cooling stack Expanding Unit Element System operating system and operation method | |
| CN107191963A (en) | A kind of method that rotary regenerative air preheater and the anti-ammonium hydrogen sulfate of the rotary regenerative air preheater are blocked | |
| CN204693473U (en) | The two-way air preheater system that a kind of coal-burning boiler first and second wind system is isolated | |
| CN201396779Y (en) | Fume flow unbalance control fume system | |
| CN201305608Y (en) | Air heating furnace tandem pre-heating system | |
| CN104390472B (en) | Low temperature exhaust heat boiler is adopted to carry out hardening and tempering method and the modifying device of electric precipitation flue gas | |
| CN103245185A (en) | Parallel-serial type drying and heating system | |
| CN101334170A (en) | Coal-burning boiler heat primary air side road device | |
| CN107228572A (en) | A kind of regulatable complete alternation wind sintering machine cooler afterheat generating system | |
| CN108398035B (en) | Combined cooling system and method for merging auxiliary machine cooling water into main machine indirect cooling tower | |
| CN101592343B (en) | Air system with unbalanced air flow control | |
| CN217568207U (en) | Full-load denitration system | |
| CN103836636B (en) | A kind of device reducing heat primary air cold wind incorporation efficiency | |
| CN215411832U (en) | Composite hot water recirculation system for full-load denitration of supercritical power station boiler | |
| CN207004588U (en) | A kind of more low pressure (LP) cylinder steam turbine generator set system optimization devices | |
| CN201680530U (en) | Primary pump variable flow system with evaporative water chiller | |
| CN209909952U (en) | Full operating mode flue gas denitration and air preheater prevent stifled system | |
| CN203922996U (en) | A kind of lear cooling duct energy conserving system | |
| CN113819481A (en) | Anti-blocking rotary air preheater based on circulating temperature rise and blowing of circulating wheel and anti-blocking method | |
| CN111841861A (en) | System and method for reducing cold air volume of coal mill | |
| CN211040943U (en) | Low-load flue gas circulation pollution-reduction efficiency-improvement heating combustion system of power station boiler | |
| CN203963989U (en) | The heat primary air heater that the bypass of wind side is set of coal-burning boiler | |
| CN206626596U (en) | Meet the afterheat utilizing system of the flue gas cool-down of low temperature electric dust removal requirement | |
| CN220802615U (en) | Urea pyrolysis denitration system of high-capacity W flame coal-fired unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110126 Termination date: 20130505 |