CN105202517A - Power station boiler residual heat utilization system capable of achieving intelligent control for fan frequency - Google Patents
Power station boiler residual heat utilization system capable of achieving intelligent control for fan frequency Download PDFInfo
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- CN105202517A CN105202517A CN201510684627.8A CN201510684627A CN105202517A CN 105202517 A CN105202517 A CN 105202517A CN 201510684627 A CN201510684627 A CN 201510684627A CN 105202517 A CN105202517 A CN 105202517A
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Abstract
The invention provides a power station boiler residual heat utilization system capable of achieving intelligent control for fan frequency. The system comprises a boiler, a main flue, a bypass flue, a heat exchanger, a flue temperature sensor and a central controller, wherein smoke generated by the boiler enters into the heat exchanger through an inlet of the bypass flue; smoke subjected to heat exchange flows into the main flue via the outlet of the bypass flue and then is discharged; a main flue fan is arranged on the main flue; a bypass flue fan is arranged on the bypass flue; the flue temperature sensor measures the temperature of discharged smoke; the central controller is in data connection with the temperature sensor, the main flue fan and the bypass flue fan; the central controller automatically adjusts the frequency of the main flue fan and the bypass flue fan according to the exhaust gas temperature measured by the temperature sensor. According to the power station boiler residual heat utilization system, the exhaust gas temperature of smoke is automatically controlled through intelligently controlling fan frequency to adjust flow of smoke participating in residual heat utilization and heat exchange, so that low-temperature corrosion is avoided, and intelligentized adjustment of the system is realized.
Description
Technical field
The invention belongs to steam boiler field, particularly relate to steam boiler waste heat and utilize field.
Background technology
Along with China's rapid economic development, energy resource consumption increases day by day, and the problem that urban air quality goes from bad to worse is also outstanding all the more, and the problem of economize energy and the discharge of minimizing environment harmful is extremely urgent.In common steam generating process; high, the with serious pollution one of the main reasons of energy consumption is that the exhaust gas temperature of boiler smoke is too high, wastes mass energy, therefore carries out recycling to waste heat of boiler tail gas; realize the object of energy-saving and emission-reduction, simultaneously can also protection of the environment.But in prior art while meeting fume afterheat, cold end corrosion may be there is, therefore cold end corrosion how is avoided to be an important problem, if simultaneously in order to just to avoiding cold end corrosion, then waste heat waste is too many in flue gas in some cases, cause the bad problem of exhaust heat utilization effect occurs, therefore above-mentioned relevant issues are urgently to be resolved hurrily.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of new residual heat from boiler fume to utilize system.
The technical solution used in the present invention is as follows: a kind of station boiler bootstrap system of blower fan frequency Based Intelligent Control, described system comprises boiler, flue collector, bypass flue and heat exchanger, the flue gas that described boiler produces enters heat exchanger by bypass flue entrance, and the flue gas after heat exchange discharges after becoming owner of flue by the outlet of bypass flue;
Flue collector blower fan is set at flue collector, bypass flue arranges bypass flue blower fan;
Described system comprises flue temperature sensor further, the temperature of described flue temperature sensor measurement discharge flue gas, described system comprises central controller, central controller and temperature sensor, flue collector blower fan valve and bypass flue blower fan carry out data cube computation, and central controller adjusts the frequency of flue collector blower fan and bypass flue blower fan automatically according to the exhaust gas temperature of temperature sensor measurement.
As preferably, if the flue-gas temperature measured is too low, then central controller is by turning the frequency of bypass flue blower fan down, increases the frequency of flue collector blower fan simultaneously, thus increases the exhaust gas volumn entering flue collector, reduces the flue gas flow entering by-pass flue.
As preferably, if the temperature measured is too high, then central controller is by increasing the frequency of bypass flue blower fan, reduce the frequency of flue collector blower fan simultaneously, thus reduce the exhaust gas volumn entering flue collector, increase the flue gas flow entering by-pass flue, avoid, because too much flue gas flows into flue collector, causing the loss of UTILIZATION OF VESIDUAL HEAT IN.
As preferably, described heat exchanger connects radiator, and described radiator is convector, and the flue gas in described heat exchanger transfers heat to the water of radiator, thus realizes utilizing waste heat to carry out heat supply.
As preferably, described radiator comprises the finned tube of upper header and lower collector pipe and the circular section between upper header and lower collector pipe thereof, described finned tube comprises base tube and is positioned at the fin of matrix periphery, the cross section of described base tube is circular arc, described fin comprises the first fin and the second fin, described first fin stretches out from the mid point of circular arc, described second fin comprises multiple fin of stretching from the facing epitaxy at the circular arc place of circular arc and from the outward extending multiple fin of the first fin, the second fin extended to same direction is parallel to each other, the base of described circular arc, first fin, the end that second fin extends forms isosceles triangle, described substrate tube arranges first fluid passage, and described first fin inside arranges second fluid passage, described first fluid passage and second fluid channel connection.
As preferably, described second fin is relative to the face specular at the first fin center line place, and the distance of adjacent the second described fin is L1, and the base length of described circular arc is W, and the length of the waist of described isosceles triangle is S, meets following formula:
L1/S*100=A*Ln (L1/W*100)+B* (L1/W)+C, wherein Ln is logarithmic function, A, B, C are coefficients, 0.66<A<0.70,21<B<24,3.3<C<5.2;
0.06<L1/S<0.07,0.08<L1/W<0.10；
3mm<L1<5mm；
40mm<S<75mm；
30mm<W<50mm；
The drift angle that the line of the mid point of circular arc and the two-end-point of circular arc is formed is a, 100 ° of <a<160 °.
Compared with prior art, the present invention has following advantage:
1) flow being adjusted the flue gas participating in UTILIZATION OF VESIDUAL HEAT IN heat exchange by the Based Intelligent Control of blower fan frequency controls the exhaust gas temperature of flue gas automatically, avoids cold end corrosion.
2) when ensureing to avoid cold end corrosion, when fume afterheat utilizing status is bad, arranges ancillary heating equipment to ensure and meet UTILIZATION OF VESIDUAL HEAT IN.
3) Automatic-heating equipment adjusts heating power automatically according to UTILIZATION OF VESIDUAL HEAT IN situation, ensures economize energy.
4) have developed the new radiator in UTILIZATION OF VESIDUAL HEAT IN, and optimize the dimensional structure of radiator, strengthen the effect of UTILIZATION OF VESIDUAL HEAT IN.
Accompanying drawing explanation
Fig. 1 is an embodiment schematic diagram of boiler waste heat utilization system of the present invention;
Fig. 2 is another embodiment schematic diagram of boiler waste heat utilization system of the present invention;
Fig. 3 is the schematic diagram that an embodiment of boiler waste heat utilization system of the present invention is improved;
Fig. 4 is the schematic diagram that another embodiment of boiler waste heat utilization system of the present invention is improved;
Fig. 5 is the schematic diagram of user's heat radiator fin pipe of the present invention;
Fig. 6 is the cross sectional representation of finned tube;
Fig. 7 is that Fig. 6 is from the schematic diagram viewed from left side;
Fig. 8 is the tangent plane schematic diagram of the fin of Fig. 6 providing holes.
Reference numeral is as follows:
1 boiler, 2 flue collector control valves, 3 bypass flue control valves, 4 total air exhausters, 5 flue temperature sensors, 6 heat exchangers, 7 central controllers, 8 inlet temperature sensors, 9 radiators, 10 bypass flue blower fans, 11 main road flue blower fans, 12 flue collectors, 13 bypass flue entrances, 14 bypass flue outlets, 15 ancillary heating equipment, 16 bypass flues, 17 first fluid passages, 18 first fins, 19 second fins, 20 second fins, 21 first limits, 22 Second Edges, 23 bases, 24 holes, 25 second fluid passages, 26 base tubes.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Fig. 1 illustrates a kind of station boiler bootstrap system, described system comprises boiler 1, flue collector 12, bypass flue 16 and heat exchanger 6, the flue gas part that described boiler 1 produces directly is got rid of by flue collector, a part enters heat exchanger 6 by bypass flue entrance 13, and the flue gas after heat exchange discharges after flowing into flue collector 12 by the outlet 14 of bypass flue.
As one preferably, described boiler waste heat utilization system adjusts exhaust gas temperature automatically to avoid cold end corrosion.The embodiment mainly taked is as follows:
Flue collector control valve 2 is set between the bypass flue entrance 13 and bypass flue outlet 14 of flue collector 12, for regulating the exhaust gas volumn of flue collector 12, bypass flue control valve 3 is set on bypass flue 16 simultaneously, regulates the exhaust gas volumn of bypass flue 16.
Described system comprises flue temperature sensor 5 further, and described flue temperature sensor 5 is arranged on the downstream of the outlet 14 of the bypass flue of flue collector 12, for measuring the temperature of discharge flue gas.Described system comprises central controller 7, central controller 7 and temperature sensor 5, flue collector control valve 2 and bypass flue control valve 3 carry out data cube computation, central controller 7 adjusts the aperture of flue collector control valve and bypass flue control valve automatically according to the exhaust gas temperature of temperature sensor measurement, to avoid cold end corrosion.
If the exhaust gas temperature measured is too low, then central controller 7 is by tuning up the aperture of flue collector control valve 2, reduces the aperture of bypass flue control valve 4 simultaneously.By reducing the flue gas flow entering by-pass flue like this, avoiding because too much flue gas carries out heat exchange and causes exhaust gas temperature too low, thus avoiding cold end corrosion.If the exhaust gas temperature measured is too high, then central controller 7 is by reducing the aperture of flue collector control valve 2, increases the aperture of bypass flue control valve 4 simultaneously.By increasing the flue gas flow entering by-pass flue like this, avoid, because too much flue gas flows into flue collector, causing the loss of UTILIZATION OF VESIDUAL HEAT IN.
Certainly, as a preferred embodiment, flue collector control valve and bypass flue control valve can not be set, as shown in Figure 2, bypass flue arranges the bypass flue blower fan 10 with central controller 7 data cube computation, at flue collector 12, flue collector blower fan 11 is set, blower fan 10 and 11 respectively with central controller 7 data cube computation, central controller 7 regulates by the frequency of adjustment bypass flue blower fan 10 and flue collector blower fan 12 exhaust gas volumn entering flue collector 12 and bypass flue 16.If the temperature measured is too low, then central controller 7 is by turning the frequency of bypass flue blower fan 10 down, increase the frequency of flue collector blower fan 12 simultaneously, thus increase the exhaust gas volumn entering flue collector, reduce the flue gas flow entering by-pass flue, avoid because too much flue gas carries out heat exchange and causes exhaust gas temperature too low, thus avoid cold end corrosion.Otherwise, if the temperature measured is too high, then central controller 7 is by increasing the frequency of bypass flue blower fan 10, reduce the frequency of flue collector blower fan simultaneously, thus reduce the exhaust gas volumn entering flue collector, increase the flue gas flow entering by-pass flue, avoid, because too much flue gas flows into flue collector, causing the loss of UTILIZATION OF VESIDUAL HEAT IN.
As preferably, described heat exchanger 6 connects radiator 9, and described radiator 9 is convector.Flue gas in described heat exchanger 6 transfers heat to the water of radiator 9, thus realizes utilizing waste heat to carry out heat supply.
As preferably, at the entrance inlet porting temperature sensor 8 of radiator 9, measured the temperature of the water entered in radiator 9 by temperature sensor 8.
An inventive point of the present invention is by controlling to enter the flow of bypass flue flue gas, thus controls the temperature entering water in radiator 9, avoids water temperature over-high or too low.
For the improvement of the embodiment of Fig. 1, as one preferably, if the temperature entering the water of radiator 9 that temperature sensor 8 is measured is too low, then central controller 7 is by reducing the aperture of flue collector control valve 2, increases the aperture of bypass flue control valve 4 simultaneously.By increasing the flue gas flow entering by-pass flue like this, thus increase the temperature that heat exchange amount improves the water entered in radiator.
If the temperature entering the water of radiator measured is too high, then central controller 7 is by increasing the aperture of flue collector control valve 2, reduces the aperture of bypass flue control valve 4 simultaneously.By reducing the flue gas flow entering by-pass flue like this, thus reduce the temperature that heat exchange amount reduces the water entered in radiator.
For the improvement of the embodiment of Fig. 2, as one preferably, if the temperature entering the water of radiator 9 that temperature sensor 8 is measured is too low, then central controller 7 is by reducing the frequency of flue collector blower fan 11, increases the frequency of bypass flue blower fan 10 simultaneously.By increasing the flue gas flow entering by-pass flue like this, reduce the exhaust gas volumn entering flue collector, thus increase the temperature that heat exchange amount improves the water entered in radiator.
If the temperature entering the water of radiator measured is too high, then central controller 7 is by increasing the frequency of flue collector blower fan 11, reduces the frequency of bypass flue blower fan 10 simultaneously.By reducing the flue gas flow entering by-pass flue like this, thus reduce the temperature that heat exchange amount reduces the water entered in radiator.
Certainly, as a preferred embodiment, flue collector control valve and bypass flue control valve can not be set, as shown in Figure 2, only the bypass flue blower fan 10 with central controller 7 data cube computation be set on bypass flue, flue collector blower fan 11 is not set.The exhaust gas volumn entering bypass flue 16 is regulated by the frequency changing bypass flue blower fan 10.If the temperature entering radiator measured is too low, then central controller 7 enters the flue gas flow of by-pass flue by the frequency increase increasing bypass flue blower fan 10, thus increases the temperature that heat exchange amount improves the water entered in radiator.
If the temperature entering radiator measured is too high, then central controller 7 adds by the frequency minimizing reducing bypass flue blower fan 10 flue gas flow entering by-pass flue, thus reduces the temperature that heat exchange amount reduces the water entered in radiator.
Certainly, as a preferred embodiment, as shown in Figure 3,4, the entrance pipe of described radiator 9 arranges ancillary heating equipment 15, for heating the water entered in radiator.By increasing ancillary heating equipment, an object to ensure that in radiator, the temperature of water reaches heating temperature.
As preferably, described ancillary heating equipment is electric heating equipment 15, by the change of the power of electric heating equipment 15 to the water extraction entered in radiator 9 for different heats.
If the temperature entering the water of radiator 9 of temperature sensor measurement is too low, then central controller 7 starts electric heating equipment automatically.
As preferably, central controller 7 adjusts heating power according to the inlet temperature entering radiator measured.When the inflow temperature measured is lower than temperature a, electric heating equipment starts heating, and heats with power A; When the inflow temperature of thermal measurement is lower than the temperature b lower than temperature a, electric heating equipment heats with the power B higher than power A; When the inflow temperature measured is lower than the temperature c lower than temperature b, electric heating equipment heats with the power C higher than power B; When the inflow temperature measured is lower than the temperature d lower than temperature c, electric heating equipment heats with the power D higher than power C; When the inflow temperature measured is lower than the temperature e lower than temperature d, electric heating equipment heats with the power E higher than power D.
Certainly, it is an option that the accuracy in order to increase measuring tempeature, another temperature sensor can be set at the water outlet of radiator 9, be calculated the starting power of electric heating equipment by the mean value of the temperature of the measurement of two temperature sensors.
In heating process, occur cold end corrosion in order to preventing by increasing another object of ancillary heating equipment.Main cause is if the temperature entering the water of radiator 9 is too low, by increasing the aperture of bypath valve or the frequency of blower fan, the flue gas quantity participating in heat exchange may be caused too much, cause producing exhaust gas temperature too low, thus cold end corrosion occurs.And by increasing ancillary heating equipment, cold end corrosion can be avoided well, heating needs can also be met simultaneously.
As preferred embodiment, if the temperature entering the water of radiator measured is too low, then central controller 7 is by reducing the aperture of flue collector control valve 2, increases the aperture of bypass flue control valve 4, to increase the exhaust gas volumn of participation simultaneously.Now, if the temperature that the smoke evacuation of measuring is measured reaches the critical-temperature of cold end corrosion, now the aperture of bypass flue control valve 4 no longer increases; If the temperature entering the water of radiator 9 now measured is still too low, then central controller controls electric heating equipment starts automatically.
As a preferred embodiment, met the demand of heating by the embodiment improved in Fig. 2.The exhaust gas volumn entering bypass flue 16 is regulated by the frequency changing bypass flue blower fan 10.If the temperature entering radiator measured is too low, then central controller 7 is by increasing the frequency of bypass flue blower fan 10, increases the flue gas flow entering by-pass flue, thus increases the temperature that heat exchange amount improves the water entered in radiator.Now, if the temperature that the smoke evacuation of measuring is measured reaches the critical-temperature of cold end corrosion, now the frequency of bypass flue blower fan no longer increases; If the temperature entering the water of radiator now measured is still too low, then central controller controls electric heating equipment starts automatically.
Can avoid unilaterally meeting heat demand by equipment like this and cause exhaust gas temperature to occur cold end corrosion.
As preferably, ancillary heating equipment 15 is arranged on the upstream of temperature sensor 8.
Certainly, for system above, present invention also offers a kind of method, the method can avoid cold end corrosion, can also meet heating needs simultaneously.
The method comprises the following steps:
The first step, first measures the exhaust gas temperature of flue gas, according to the aperture of exhaust gas temperature self regulating valve door or the frequency of blower fan of flue gas.
If the temperature measured is too low, then for the embodiment of Fig. 1, then central controller 7 is by tuning up the aperture of flue collector control valve 2, reduces the aperture of bypass flue control valve 4 simultaneously.For the embodiment of Fig. 2, then central controller 7 is by turning the frequency of bypass flue blower fan 10 down, increases the frequency of flue collector blower fan simultaneously.Reduced the flue gas flow entering by-pass flue by above-mentioned measure, avoid because too much flue gas carries out heat exchange and causes exhaust gas temperature too low.
If the temperature measured is too high, then for the embodiment of Fig. 1, then central controller 7 is by reducing the aperture of large flue collector control valve 2, increases the aperture of bypass flue control valve 4 simultaneously.For the embodiment of Fig. 2, then central controller 7 is by increasing the frequency of bypass flue blower fan 10, reduces the frequency of flue collector blower fan simultaneously.
Mainly cold end corrosion is prevented by first step.
Second step, and then the inlet temperature measuring radiator, determine whether to start ancillary heating equipment according to the temperature measured.
If the temperature measured is too low, then central controller starts ancillary heating equipment automatically.
While preventing cold end corrosion, the needs of heating are mainly met by second step.
Described radiator comprises upper header and lower collector pipe and the finned tube between upper lower collector pipe thereof, described finned tube comprises base tube 26 and is positioned at the fin 18-20 of base tube periphery, as Fig. 5, shown in 6, the cross section of described base tube is circular arc, described fin comprises the first fin 18 and the second fin 19, 20, described first fin 18 is outward extending from the mid point of the circular arc of circular arc, described second fin 19, 20 comprise multiple fins 19 of stretching from the facing epitaxy at the place, two limits of circular arc and from the outward extending multiple fin 20 of the first fin, the second fin 19 extended to same direction, 20 is parallel to each other, such as, as shown in Figure 2, limit from the circular arc Second Edge 22(left side) outward extending second fin 19, 20 is parallel to each other, from the isosceles triangle first limit 21(i.e. limit on the right) outward extending second fin 19, 20 is parallel to each other, described first fin 18, second fin 19, 20 ends extended form isosceles triangle, as shown in Figure 2, the length of the waist of isosceles triangle is S, described base tube 26 inside arranges first fluid passage 17, and described first fin 18 inside arranges second fluid passage 25, described first fluid passage 18 and second fluid channel connection 25.Such as, as described in Figure 5, be communicated with in the position of the mid point of circular arc.
By vibrational power flow so, the multiple fin of base tube 26 outer setting can be made, increase heat radiation, fluid passage is set in the first fin inside simultaneously, make fluid enter in the first fin, the second fin be directly connected with the first fin carries out heat exchange, adds heat-sinking capability.
The fluid of described first fluid passage and second fluid passage is preferably water.
General finned tube is all that surrounding or both sides arrange fin, but find in engineering, generally heat convection effect is bad for the fin of the side contacted with wall, because air wall side flow relatively poor, therefore circular arc base 23 is set to plane by the present invention, time therefore fin is installed, can directly by plane and wall close contact, compared with other radiator, installing space can be saved greatly, avoid the waste in space, take special fin configuration simultaneously, ensure to meet best radiating effect.
As preferably, described second fin 19,20 is relative to the face specular at the first fin 18 center line place, namely relative to the face specular at the line place of the mid point of circular arc and the mid point at place, base, in other words relative to the face specular at the line place in the mid point of circular arc and the center of circle at circular arc place.
As preferably, the second fin extends perpendicular to two waists of isosceles triangle.
When the length of the angle a that the line of the mid point of circular arc and the end points of arc is formed and arc is certain, first fin 18 and the second fin 19, 20 is longer, then heat transfer effect is better in theory, find in process of the test, when the first fin and the second fin reach certain length time, then heat transfer effect just increases very not obvious, main because along with the first fin and the increase of the second finned length, also more and more lower in the temperature of flight tip, along with temperature is reduced to a certain degree, heat transfer effect then can be caused not obvious, also add the cost of material on the contrary and considerably increase the space occupied of radiator, simultaneously, in heat transfer process, if the spacing between the second fin is too little, also the deterioration of heat transfer effect is easily caused, because along with the increase of finned tube length, in air uphill process, boundary layer is thickening, boundary layer between adjacent fins is caused to overlap mutually, worsen heat transfer, spacing between too low or the second fin of finned tube length causes too greatly heat exchange area to reduce, have impact on the transmission of heat, therefore in the distance of the second adjacent fin, the length of side of circular arc, an optimized size relationship is met between the length of the first fin and the second fin and heat sink length.
Therefore, the present invention is the dimensionally-optimised relation of the radiator of the best summed up by thousands of test datas of the radiator of multiple different size.
The distance of adjacent the second described fin is L1, and the base length of described circular arc is W, and the length of the waist of described isosceles triangle is S, meets following formula:
L1/S*100=A*Ln (L1/W*100)+B* (L1/W)+C, wherein Ln is logarithmic function, A, B, C are coefficients, 0.66<A<0.70,21<B<24,3.3<C<5.2;
0.06<L1/S<0.07,0.08<L1/W<0.10；
3mm<L1<5mm；
40mm<S<75mm；
30mm<W<50mm；
The drift angle that the line of the mid point of circular arc and the two-end-point of circular arc is formed is a, 100 ° of <a<160 °.
As preferably, base tube length is L, 0.02<W/L<0.04,800mm<L<2500mm.
As preferably, A=0.68, B=22.6, C=4.3.
It should be noted that, the distance L1 of adjacent second fin is the distance counted from the center of the second fin, as shown in Figure 5.
By testing after result of calculation, by the numerical value of computation bound and median, the result of gained matches with formula substantially, and error is substantially within 3.44%, and maximum relative error is no more than 3.78%, and mean error is 2.32% again.
Preferably, the distance of described the second adjacent fin is identical.
As preferably, the width of the first fin is greater than the width of the second fin.
Preferably, the width of the first fin is b1, and the width of the second fin is b2, wherein 2.2*b2<b1<3.1*b2;
As preferably, 0.9mm<b2<1mm, 2.0mm<b1<3.2mm.
As preferably, the width of second fluid passage be the 0.85-0.95 of the width of the second fin doubly, be preferably 0.90-0.92 doubly.
Width b1, b2 herein refer to the mean breadth of fin.
Found through experiments the effect such as fin width, channel width taking above-mentioned optimization, best heat transfer effect can be reached.
Preferably, change according to certain rule for the distance between the second fin, concrete rule is the mid point from the end points of circular arc to circular arc, distance between the second fin 19 that two limits 21,22 of circular arc extend is more and more less, end from the mid point of circular arc to the first fin 18, the distance between the second fin 20 that the first fin 18 extends is increasing.Main cause is the second fin arranged on circular arc, and heat dissipation capacity increases from circular arc end points gradually to arcuate midway point, and therefore need the quantity increasing fin, the spacing therefore by reducing fin increases the quantity of fin.In like manner, along the first fin 18, to end in the middle part of circular arc, the quantity of heat radiation is fewer and feweri, therefore reduces the quantity of fin accordingly.By setting like this, radiating efficiency can be improved greatly, save material greatly simultaneously.
As preferably, mid point from the end points of circular arc to circular arc, the amplitude that distance between the second fin 19 that two limits of circular arc extend reduces is more and more less, end from the mid point of circular arc to the first fin 18, the amplitude that the distance between the second fin 20 that the first fin 18 extends increases is increasing.Found through experiments, by above-mentioned setting, with increase or minimizing amplitude identical compared with, the radiating effect of about 15% can be improved.Therefore there is good radiating effect.
As preferably, although the width of the second fin or distance change, preferably, still meet the regulation of above-mentioned optimum formula.
Preferably, as shown in Figure 8, providing holes 24 on the first and/or second fin, for breakable layer laminar sublayer.Main cause is that the second fin carries out heat exchange mainly through the convection current of air, air upwards carries out the flowing of free convection from the bottom of the second fin, in the process of air flows upwards, the thickness in boundary layer constantly becomes large, even finally cause the boundary layer between adjacent second fin to overlap, this kind of situation can cause the deterioration of heat exchange.Therefore boundary layer can be destroyed by providing holes 24, thus augmentation of heat transfer.
Preferably, the shape in hole 24 is semicircle or circular.
Preferably, the thickness of the through whole fin in hole 24, as shown in Figure 8.
As one preferably, along the direction of the flowing of air, the top namely from the bottom of fin to radiator, the density (i.e. quantity) in hole 9 constantly increases.Main cause is the direction of the flowing along air, and the thickness in boundary layer constantly increases, and therefore by arranging the density in ever-increasing hole 9, can make constantly to increase the destructiveness in boundary layer, thus augmentation of heat transfer.
Preferably, the density in the place that hole 9 is the closeest is 1.26-1.34 times of the density in the thinnest place, preferably 1.28 times.
Although the present invention discloses as above with preferred embodiment, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (6)
1. the station boiler bootstrap system of a blower fan frequency Based Intelligent Control, described system comprises boiler, flue collector, bypass flue and heat exchanger, the flue gas that described boiler produces enters heat exchanger by bypass flue entrance, and the flue gas after heat exchange discharges after becoming owner of flue by the outlet of bypass flue;
Flue collector blower fan is set at flue collector, bypass flue arranges bypass flue blower fan;
Described system comprises flue temperature sensor further, the temperature of described flue temperature sensor measurement discharge flue gas, described system comprises central controller, central controller and temperature sensor, flue collector blower fan valve and bypass flue blower fan carry out data cube computation, and central controller adjusts the frequency of flue collector blower fan and bypass flue blower fan automatically according to the exhaust gas temperature of temperature sensor measurement.
2. station boiler bootstrap system as claimed in claim 1, if the flue-gas temperature measured is too low, then central controller is by turning the frequency of bypass flue blower fan down, increase the frequency of flue collector blower fan simultaneously, thus increase the exhaust gas volumn entering flue collector, reduce the flue gas flow entering by-pass flue.
3. station boiler bootstrap system as claimed in claim 1, if the temperature measured is too high, then central controller is by increasing the frequency of bypass flue blower fan, reduce the frequency of flue collector blower fan simultaneously, thus reduce the exhaust gas volumn entering flue collector, increase the flue gas flow entering by-pass flue, avoid, because too much flue gas flows into flue collector, causing the loss of UTILIZATION OF VESIDUAL HEAT IN.
4. the station boiler bootstrap system as described in claim 1 or 2 or 3, described heat exchanger connects radiator, and described radiator is convector, and the flue gas in described heat exchanger transfers heat to the water of radiator, thus realizes utilizing waste heat to carry out heat supply.
5. station boiler bootstrap system as claimed in claim 4, described radiator comprises the finned tube of upper header and lower collector pipe and the circular section between upper header and lower collector pipe thereof, described finned tube comprises base tube and is positioned at the fin of matrix periphery, the cross section of described base tube is circular arc, described fin comprises the first fin and the second fin, described first fin stretches out from the mid point of circular arc, described second fin comprises multiple fin of stretching from the facing epitaxy at the circular arc place of circular arc and from the outward extending multiple fin of the first fin, the second fin extended to same direction is parallel to each other, the base of described circular arc, first fin, the end that second fin extends forms isosceles triangle, described substrate tube arranges first fluid passage, and described first fin inside arranges second fluid passage, described first fluid passage and second fluid channel connection.
6. station boiler bootstrap system as claimed in claim 5, it is characterized in that, described second fin is relative to the face specular at the first fin center line place, the distance of adjacent the second described fin is L1, the base length of described circular arc is W, the length of the waist of described isosceles triangle is S, meets following formula:
L1/S*100=A*Ln (L1/W*100)+B* (L1/W)+C, wherein Ln is logarithmic function, A, B, C are coefficients, 0.66<A<0.70,21<B<24,3.3<C<5.2;
0.06<L1/S<0.07,0.08<L1/W<0.10；
3mm<L1<5mm；
40mm<S<75mm；
30mm<W<50mm；
The drift angle that the line of the mid point of circular arc and the two-end-point of circular arc is formed is a, 100 ° of <a<160 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510684627.8A CN105202517B (en) | 2015-10-22 | 2015-10-22 | A kind of station boiler afterheat utilizing system of blower fan frequency intelligent control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510684627.8A CN105202517B (en) | 2015-10-22 | 2015-10-22 | A kind of station boiler afterheat utilizing system of blower fan frequency intelligent control |
Publications (2)
| Publication Number | Publication Date |
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| CN105202517A true CN105202517A (en) | 2015-12-30 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108194911A (en) * | 2017-11-30 | 2018-06-22 | 中国海洋石油集团有限公司 | A kind of thermal recovery boiler Pulsed steam generating means and method |
| CN110748912A (en) * | 2018-07-24 | 2020-02-04 | 青岛科技大学 | Power station boiler waste heat utilization system based on smoke temperature communication control valve |
| CN110748913A (en) * | 2018-07-24 | 2020-02-04 | 青岛科技大学 | Power station boiler waste heat utilization system based on heat storage air temperature communication control |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110410816B (en) * | 2018-07-24 | 2020-11-13 | 苏州海陆重工股份有限公司 | Power station boiler waste heat utilization system capable of intelligently controlling fan operation in communication mode |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900389A (en) * | 2014-04-14 | 2014-07-02 | 山东理工大学 | Intelligent-control efficient kiln waste heat utilization system |
| CN104713388A (en) * | 2014-04-14 | 2015-06-17 | 中北大学 | Combined heat and power generation system with regulating valves adapting to changes |
| CN104791875A (en) * | 2014-04-14 | 2015-07-22 | 中北大学 | Combined heat and power generation system calculating heat losses |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900389A (en) * | 2014-04-14 | 2014-07-02 | 山东理工大学 | Intelligent-control efficient kiln waste heat utilization system |
| CN104713388A (en) * | 2014-04-14 | 2015-06-17 | 中北大学 | Combined heat and power generation system with regulating valves adapting to changes |
| CN104791875A (en) * | 2014-04-14 | 2015-07-22 | 中北大学 | Combined heat and power generation system calculating heat losses |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108194911A (en) * | 2017-11-30 | 2018-06-22 | 中国海洋石油集团有限公司 | A kind of thermal recovery boiler Pulsed steam generating means and method |
| CN110748912A (en) * | 2018-07-24 | 2020-02-04 | 青岛科技大学 | Power station boiler waste heat utilization system based on smoke temperature communication control valve |
| CN110748913A (en) * | 2018-07-24 | 2020-02-04 | 青岛科技大学 | Power station boiler waste heat utilization system based on heat storage air temperature communication control |
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| CN105202517B (en) | 2018-04-10 |
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