CN105202617B - A kind of station boiler bootstrap system of setting ancillary heating equipment - Google Patents

Abstract

The invention provides a kind of station boiler heating system of setting ancillary heating equipment, described system includes 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 is discharged after the outlet of bypass flue flows into flue collector；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 realizing carrying out heat supply using waste heat；Ancillary heating equipment is arranged on the entrance pipe of described radiator, enters the water in radiator for heating.According to UTILIZATION OF VESIDUAL HEAT IN situation adjust automatically heating power it is ensured that heating effect, energy saving is it is achieved that the intelligent of system is adjusted the automatic firing equipment of the present invention.

Description

A kind of station boiler bootstrap system of setting ancillary heating equipment

Technical field

The invention belongs to steam boiler field, more particularly, to steam boiler waste heat utilize field.

Background technology

With China's rapid economic development, energy resource consumption increasingly increases, and the problem that urban air quality goes from bad to worse also is got over Send out prominent, the problem of energy saving and minimizing environment harmful discharge is extremely urgent.In common steam generating process, energy consumption High, with serious pollution one of the main reasons is that the exhaust gas temperature of boiler smoke is too high, wastes mass energy, therefore to boiler tail Gas waste heat carries out recycling, realizes the purpose of energy-saving and emission-reduction, simultaneously can be with environmental protection.But full in prior art It may occur that cold end corrosion while sufficient fume afterheat, cold end corrosion therefore how is avoided to be an important problem, simultaneously If in order to just to avoiding cold end corrosion, in flue gas, waste heat wastes too much in some cases, lead to waste heat profit With the bad problem of effect, therefore above-mentioned relevant issues are urgently to be resolved hurrily.

Content of the invention

The technical problem to be solved 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 heating system of setting ancillary heating equipment, described System includes boiler, flue collector, bypass flue and heat exchanger, and the flue gas that described boiler produces passes through the entrance of bypass flue entrance and changes Hot device, the flue gas after heat exchange is discharged after the outlet of bypass flue flows into flue collector；

Described heat exchanger connects radiator, and described radiator is convector, and the flue gas in described heat exchanger is by heat Pass to the water of radiator, thus realizing carrying out heat supply using waste heat；

Ancillary heating equipment is arranged on the entrance pipe of described radiator, enters the water in radiator for heating.

Preferably, described ancillary heating equipment is electric heating equipment,

Preferably, described system includes temperature sensor and central controller, temperature sensor is arranged on radiator Entrance, enters the temperature of the water in radiator, central controller and temperature sensor and electrical heating by temperature sensor measurement Device data connects, if the temperature of the water of entrance radiator of temperature sensor measurement is too low, central controller opens automatically Galvanic electricity firing equipment.

Preferably, central controller adjusts heating power according to the inlet temperature of the entrance radiator of measurement；Work as survey When the inflow temperature of amount is less than temperature a, electric heating equipment starts heating, and is heated with power A；Enter water temperature when thermal measurement When degree is less than temperature b lower than temperature a, electric heating equipment is heated with the power B higher than power A；Enter water temperature when measure When degree is less than temperature c lower than temperature b, electric heating equipment is heated with the power C higher than power B；Enter water temperature when measure When degree is less than temperature d lower than temperature c, electric heating equipment is heated with the power D higher than power C；Enter water temperature when measure When degree is less than temperature e lower than temperature d, electric heating equipment is heated with the power E higher than power D.

Preferably, the water outlet in radiator arranges another temperature sensor, by two temperature sensors The startup power to calculate electric heating equipment for the meansigma methodss of the temperature of measurement.

Preferably, described heat exchanger connects radiator, described radiator is convector, the cigarette in described heat exchanger Gas transfers heat to the water of radiator, thus realizing carrying out heat supply using waste heat.

Preferably, described radiator includes upper header and lower collector pipe and its is located at the circular arc between upper header and lower collector pipe The finned tube of tee section, the fin that described finned tube includes base tube and is located at matrix periphery, the cross section of described base tube is round Arc, described fin includes the first fin and the second fin, and described first fin is to stretch out from the midpoint of circular arc, and described Two fins include the multiple fins extending outwardly being located from the circular arc of circular arc and from the first fin stretch out many Individual fin, the second fin extending to same direction is parallel to each other, and the base of described circular arc, the first fin, the second fin prolong The end stretched forms isosceles triangle；Described substrate tube arranges first fluid passage, setting second inside described first fin Fluid passage, described first fluid passage and second fluid channel connection.

Preferably, the face specular that described second fin is located with respect to the first fin center line, adjacent is described The distance of the second 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 such as Lower formula：

L1/S*100=A*Ln (L1/W*100)+B* (L1/W)+C, wherein Ln are logarithmic functions, and 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 midpoint of circular arc is a with the drift angle of the line formation of the two-end-point of circular arc, 100 °<a<160°.

Compared with prior art, the present invention has the advantage that：

1）Automatically control the exhaust gas temperature of flue gas by controlling the flow of the flue gas participating in UTILIZATION OF VESIDUAL HEAT IN heat exchange, it is to avoid low Temperature corrosion.

2）In the case of ensureing to avoid cold end corrosion, when fume afterheat utilizing status are bad, setting auxiliary adds Hot equipment is ensureing to meet UTILIZATION OF VESIDUAL HEAT IN.

3）Automatically firing equipment is according to UTILIZATION OF VESIDUAL HEAT IN situation adjust automatically heating power, energy saving.

4) have developed the new radiator in UTILIZATION OF VESIDUAL HEAT IN, and optimize the dimensional structure of radiator, strengthen waste heat profit Effect.

Brief description

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 improved schematic diagram of an embodiment of boiler waste heat utilization system of the present invention；

Fig. 4 is the improved schematic diagram of another embodiment of boiler waste heat utilization system of the present invention；

Fig. 5 is the schematic diagram of user's heat radiator fin pipe of the present invention；

Fig. 6 is the cross-sectional view of finned tube；

Fig. 7 is schematic diagram in terms of left side for the Fig. 6；

Fig. 8 is the tangent plane schematic diagram of the fin of Fig. 6 providing holes.

Reference is as follows：

1 boiler, 2 flue collector regulating valves, 3 bypass flue regulating valves, 4 total air exhausters, 5 flue temperature sensors, 6 heat exchange Device, 7 central controllers, 8 inlet temperature sensors, 9 radiators, 10 bypass flue blower fans, 11 main road flue blower fans, 12 main cigarettes Road, 13 bypass flue entrances, 14 bypass flue outlets, 15 ancillary heating equipment, 16 bypass flues, 17 first fluid passages, 18 First fin, 19 second fins, 20 second fins, 21 first sides, 22 second sides, 23 bases, 24 holes, 25 second fluid passages, 26 base tubes.

Specific embodiment

Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described in detail.

Fig. 1 illustrates a kind of station boiler bootstrap system, and described system includes boiler 1, flue collector 12, bypass flue 16 and heat exchanger 6, the flue gas part that described boiler 1 produces directly is excluded by flue collector, a part of is entered by bypass flue Mouth 13 entrance heat exchangers 6, the flue gas after heat exchange is discharged after flowing into flue collector 12 by the outlet 14 of bypass flue.

As one preferably, described boiler waste heat utilization system adjust automatically exhaust gas temperature is avoiding cold end corrosion.Mainly The embodiment taken is as follows：

Export and between 14, flue collector regulating valve 2 is set in the bypass flue entrance 13 of flue collector 12 and bypass flue, be used for Adjust the exhaust gas volumn of flue collector 12, bypass flue regulating valve 3 is arranged on bypass flue 16 simultaneously, adjust the cigarette of bypass flue 16 Tolerance.

Described system further includes flue temperature sensor 5, and described flue temperature sensor 5 is arranged on flue collector 12 The downstream of the outlet 14 of bypass flue, for the temperature of measurement discharge flue gas.Described system includes central controller 7, central authorities' control Device 7 processed and temperature sensor 5, flue collector regulating valve 2 and bypass flue regulating valve 3 carry out data cube computation, central controller 7 basis The exhaust gas temperature of temperature sensor measurement carrys out the aperture of adjust automatically flue collector regulating valve and bypass flue regulating valve, low to avoid Temperature corrosion.

If measurement exhaust gas temperature too low, central controller 7 by tuning up the aperture of flue collector regulating valve 2, simultaneously Reduce the aperture of bypass flue regulating valve 4.By such flue gas flow reducing and entering by-pass flue, it is to avoid because excessive cigarette Gas carries out heat exchange and leads to exhaust gas temperature too low, thus avoiding cold end corrosion.If the exhaust gas temperature of measurement is too high, central authorities' control Device 7 processed passes through to reduce the aperture of flue collector regulating valve 2, increases the aperture of bypass flue regulating valve 4 simultaneously.By so increase into Enter the flue gas flow of by-pass flue, it is to avoid because excessive flue gas flows into flue collector, cause the loss of UTILIZATION OF VESIDUAL HEAT IN.

Certainly, as a preferred embodiment, flue collector regulating valve and bypass flue regulating valve can be not provided with, such as scheme Shown in 2, on bypass flue, setting and the bypass flue blower fan 10 of central controller 7 data cube computation, arrange master in flue collector 12 Flue blower fan 11, blower fan 10 and 11 respectively with central controller 7 data cube computation, central controller 7 pass through adjust bypass flue wind The frequency of machine 10 and flue collector blower fan 12 enters the exhaust gas volumn of flue collector 12 and bypass flue 16 to adjust.If the temperature of measurement Too low, then central controller 7, by turning the frequency of bypass flue blower fan 10 down, increases the frequency of flue collector blower fan 12 simultaneously, from And increase the exhaust gas volumn entering flue collector, reduce the flue gas flow entering by-pass flue, it is to avoid because excessive flue gas is changed Heat and lead to exhaust gas temperature too low, thus avoiding cold end corrosion.Whereas if the temperature of measurement is too high, then central controller 7 leads to Cross the frequency increasing bypass flue blower fan 10, reduce the frequency of flue collector blower fan simultaneously, thus reducing the flue gas entering flue collector Amount, increases the flue gas flow entering by-pass flue, it is to avoid because excessive flue gas flows into flue collector, cause the damage of UTILIZATION OF VESIDUAL HEAT IN Lose.

Preferably, described heat exchanger 6 connects radiator 9, described radiator 9 is convector.In described heat exchanger 6 Flue gas transfer heat to the water of radiator 9, thus realizing carrying out heat supply using waste heat.

Preferably, in the entrance inlet porting temperature sensor 8 of radiator 9, being entered by temperature sensor 8 measurement and dissipate The temperature of the water in hot device 9.

One inventive point of the present invention is by controlling the flow entering bypass flue flue gas, thus controlling entrance radiating The temperature of water in device 9, it is to avoid water temperature over-high or too low.

For the improvement of the embodiment of Fig. 1, preferred as one, if the entrance radiator 9 of temperature sensor 8 measurement The temperature of water is too low, then central controller 7 passes through to reduce the aperture of flue collector regulating valve 2, increases bypass flue regulating valve 4 simultaneously Aperture.By such flue gas flow increasing and entering by-pass flue, thus increase heat exchange amount entering in radiator to improve The temperature of water.

If the temperature of the water of entrance radiator of measurement is too high, central controller 7 passes through to increase flue collector regulating valve 2 Aperture, simultaneously reduce bypass flue regulating valve 4 aperture.By such flue gas flow reducing and entering by-pass flue, thus Reduce heat exchange amount to be lowered into the temperature of the water in radiator.

For the improvement of the embodiment of Fig. 2, preferred as one, if the entrance radiator 9 of temperature sensor 8 measurement The temperature of water is too low, then central controller 7 passes through to reduce the frequency of flue collector blower fan 11, increases bypass flue blower fan 10 simultaneously Frequency.By such flue gas flow increasing and entering by-pass flue, it is lowered into the exhaust gas volumn of flue collector, thus increasing heat exchange amount To improve the temperature entering the water in radiator.

If the temperature of the water of entrance radiator of measurement is too high, central controller 7 passes through to increase flue collector blower fan 11 Frequency, simultaneously reduce bypass flue blower fan 10 frequency.By such flue gas flow reducing and entering by-pass flue, thus subtracting Lack heat exchange amount to be lowered into the temperature of the water in radiator.

Certainly, as a preferred embodiment, flue collector regulating valve and bypass flue regulating valve can be not provided with, such as scheme Shown in 2, only setting and the bypass flue blower fan 10 of central controller 7 data cube computation on bypass flue, are not provided with flue collector wind Machine 11.Adjust the exhaust gas volumn entering bypass flue 16 by the frequency changing bypass flue blower fan 10.If the entrance of measurement The temperature of radiator is too low, then central controller 7 passes through to increase the frequency increase entrance by-pass flue of bypass flue blower fan 10 Flue gas flow, thus increase heat exchange amount to improve the temperature entering the water in radiator.

If the temperature of the entrance radiator of measurement is too high, central controller 7 passes through to reduce bypass flue blower fan 10 Frequency reduces the flue gas flow added into by-pass flue, thus reducing heat exchange amount to be lowered into the temperature of the water in radiator.

Certainly, as a preferred embodiment, as shown in Figure 3,4, the described entrance pipe of radiator 9 is arranged auxiliary Help firing equipment 15, enter the water in radiator for heating.By increasing ancillary heating equipment, a purpose is to ensure that In radiator, the temperature of water reaches heating temperature.

Preferably, described ancillary heating equipment is electric heating equipment 15, by the change of the power of electric heating equipment 15 Change and to provide different heats to the water entering in radiator 9.

If the temperature of the water of entrance radiator 9 of temperature sensor measurement is too low, central controller 7 automatic electricity Firing equipment.

Preferably, central controller 7 adjusts heating power according to the inlet temperature of the entrance radiator of measurement.Work as survey When the inflow temperature of amount is less than temperature a, electric heating equipment starts heating, and is heated with power A；Enter water temperature when thermal measurement When degree is less than temperature b lower than temperature a, electric heating equipment is heated with the power B higher than power A；Enter water temperature when measure When degree is less than temperature c lower than temperature b, electric heating equipment is heated with the power C higher than power B；Enter water temperature when measure When degree is less than temperature d lower than temperature c, electric heating equipment is heated with the power D higher than power C；Enter water temperature when measure When degree is less than temperature e lower than temperature d, electric heating equipment is heated with the power E higher than power D.

Of course, it is possible to select, in order to increase the accuracy of measurement temperature, can set in the water outlet of radiator 9 Put another temperature sensor, calculate opening of electric heating equipment by the meansigma methodss of the temperature of the measurement of two temperature sensors Dynamic power.

It is to prevent from, during heating, cold end corrosion occurs by another purpose increasing ancillary heating equipment.Main Reason is wanted to be 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 that may result in participation heat exchange is excessive, leads to generation exhaust gas temperature too low, thus there is cold end corrosion.And pass through Increase ancillary heating equipment, cold end corrosion can be avoided well, heating needs can also be met simultaneously.

As preferred embodiment, if the temperature of the water of entrance radiator of measurement is too low, central controller 7 passes through Reduce the aperture of flue collector regulating valve 2, increase the aperture of bypass flue regulating valve 4, to increase the exhaust gas volumn of participation simultaneously.This When, if the temperature of the smoke evacuation measurement of measurement reaches the critical temperature of cold end corrosion, now the aperture of bypass flue regulating valve 4 is not It is further added by；If the temperature of the water of entrance radiator 9 now measuring is still too low, central controller controls electric heating equipment Automatic.

As a preferred embodiment, meet the demand of heating by improving the embodiment in Fig. 2.Other by changing The frequency of road flue blower fan 10 enters the exhaust gas volumn of bypass flue 16 to adjust.If the temperature mistake of the entrance radiator of measurement Low, then central controller 7 passes through to increase the frequency of bypass flue blower fan 10, increases the flue gas flow entering by-pass flue, thus Increase heat exchange amount to improve the temperature entering the water in radiator.Now, if the temperature of the smoke evacuation measurement of measurement reaches low temperature Corrosion critical temperature, now the frequency of bypass flue blower fan be not further added by；If the water of entrance radiator now measuring Temperature is still too low, then central controller controls electric heating equipment automatic.

Can avoid unilaterally meeting heat demand by such equipment and lead to exhaust gas temperature that cold end corrosion occurs.

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, same When can also meet heating needs.

The method comprises the following steps：

The first step, first measure flue gas exhaust gas temperature, the aperture of the exhaust gas temperature adjust automatically valve according to flue gas or The frequency of person's blower fan.

If the temperature of measurement is too low, for the embodiment of Fig. 1, then central controller 7 is by tuning up flue collector regulation The aperture of valve 2, reduces the aperture of bypass flue regulating valve 4 simultaneously.For the embodiment of Fig. 2, then central controller 7 is by turning down The frequency of bypass flue blower fan 10, increases the frequency of flue collector blower fan simultaneously.Reduced by above-mentioned measure and enter by-pass flue Flue gas flow, it is to avoid because excessive flue gas carries out heat exchange and leads to exhaust gas temperature too low.

If the temperature of measurement is too high, for the embodiment of Fig. 1, then central controller 7 is by reducing big flue collector tune The aperture of section valve 2, increases the aperture of bypass flue regulating valve 4 simultaneously.For the embodiment of Fig. 2, then central controller 7 is by increasing Plus the frequency of bypass flue blower fan 10, reduce the frequency of flue collector blower fan simultaneously.

Cold end corrosion is mainly prevented by first step.

Second step, then measures the inlet temperature of radiator again, determines whether that starting auxiliary adds according to the temperature of measurement Hot equipment.

If the temperature of measurement is too low, central controller automatic ancillary heating equipment.

While preventing cold end corrosion, mainly meet the needs of heating by second step.

Described radiator includes upper header and lower collector pipe and its finned tube between upper lower collector pipe, described finned tube bag The fin 18-20 including base tube 26 and being located at base tube periphery, as shown in Figure 5,6, the cross section of described base tube is circular arc, described Fin includes the first fin 18 and the second fin 19,20, and described first fin 18 is to extension from the midpoint of the circular arc of circular arc Stretch, described second fin 19,20 include the multiple fins 19 extending outwardly being located from two sides of circular arc and from Multiple fins 20 that first fin stretches out, the second fin 19,20 extending to same direction is parallel to each other, for example, such as Fig. 2 Shown, from circular arc the second side 22（The side on the left side）The second fin 19,20 stretching out is parallel to each other, from isosceles triangle On one side 21（The i.e. side on the right）The second fin 19,20 stretching out is parallel to each other, described first fin 18, the second fin 19, The end of 20 extensions forms isosceles triangle, as shown in Fig. 2 the length of the waist of isosceles triangle is S；Set inside described base tube 26 Put first fluid passage 17, the internal setting second fluid passage 25 of described first fin 18, described first fluid passage 18 and the Two fluid channel connections 25.For example, as described in Figure 5, connect in the position at the midpoint of circular arc.

By structure setting so, so that base tube 26 is outside arranges multiple fins, increase radiating, simultaneously first So that fluid enters in the first fin, the second fin being directly connected with the first fin is entered for setting fluid passage inside fin Row heat exchange, increased heat-sinking capability.

The fluid of described first fluid passage and second fluid passage is preferably water.

General finned tube is all surrounding or both sides setting fin, but finds in engineering, the side contacting with wall Fin generally heat convection effect is bad because air wall side flow relatively poor, therefore the present invention will Circular arc base 23 is set to plane, when therefore installing fin, directly can be in close contact plane with wall, with other Radiator is compared, and can greatly save installing space, it is to avoid the waste in space, take special fin configuration simultaneously it is ensured that Meet optimal radiating effect.

Preferably, the face specular that described second fin 19,20 is located with respect to the first fin 18 center line, that is, relatively The face specular that the line at the midpoint being located in midpoint and the base of circular arc is located, in other words with respect to midpoint and the circle of circular arc The face specular that the line in the center of circle that arc is located is located.

Preferably, the second fin extends perpendicular to two waists of isosceles triangle.

In the case that the midpoint of circular arc is certain with the angle a of the line formation of the end points of arc and the length of arc, the One fin 18 and the second fin 19,20 are longer, then heat transfer effect is better in theory, find, when the first fin in process of the test When reaching certain length with the second fin, then heat transfer effect just increases very inconspicuous, is primarily due to the first fin Increase with the second finned length, also more and more lower in the temperature of flight tip, reduce to a certain extent with temperature, then can lead to Heat transfer effect is inconspicuous, the cost that also add material on the contrary and the space occupying considerably increasing radiator, changes meanwhile In thermal process, if the spacing between the second fin is too little, also easily cause the deterioration of heat transfer effect, because with fin pipe range The increase of degree, in air uphill process, boundary region is thickening, causes boundary region between adjacent fins mutually to coincide, and deteriorates heat transfer, wing Piece length of tube is too low or the second fin between spacing cause greatly very much heat exchange area to reduce, have impact on the transmission of heat, therefore Long in the distance of the second adjacent fin, the length of the length of side of circular arc, the first fin and the second fin and heat sink An optimized size relationship is met between degree.

Therefore, the present invention is optimal the dissipating being summed up by thousands of test datas of multiple various sizes of radiators The dimensionally-optimised relation of hot device.

The distance of adjacent the second described fin is L1, and the base length of described circular arc is W, described isosceles triangle Waist length be S, meet equation below：

L1/S*100=A*Ln (L1/W*100)+B* (L1/W)+C, wherein Ln are logarithmic functions, and 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 midpoint of circular arc is a with the drift angle of the line formation of the two-end-point of circular arc, 100 °<a<160°.

Preferably, base tube length is L, 0.02<W/L<0.04,800mm<L<2500mm.

Preferably, A=0.68, B=22.6, C=4.3.

It should be noted that adjacent second fin is to start, from the center of the second fin, the distance counted apart from L1, such as As shown in Fig. 5.

Tested again after result of calculation, by calculating the numerical value on border and intermediate value, the result of gained is basic Above match with formula, substantially within 3.44%, maximum relative error is less than 3.78% to error, and mean error is 2.32%.

Preferably, the distance of described the second adjacent fin is identical.

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;

Preferably, 0.9mm<b2<1mm,2.0mm<b1<3.2mm.

Preferably, the width of second fluid passage is 0.85-0.95 times of the width of the second fin, preferably 0.90- 0.92 times.

Width b1, b2 herein refers to the mean breadth of fin.

It is found through experiments and takes fin width, channel width of above-mentioned optimization and other effects, optimal changing can be reached Thermal effect.

Preferably, it is to be changed according to certain rule for the distance between second fin, concrete rule is from circle To the midpoint of circular arc, the distance between second fin 19 extending from two sides 21,22 of circular arc is less and less for the end points of arc, from The midpoint of circular arc to the end of the first fin 18, the distance between second fin 20 extending from the first fin 18 is increasing. Main cause be on circular arc setting the second fin, heat dissipation capacity be gradually increased from circular arc end points to arcuate midway point it is therefore desirable to Increase the quantity of fin, the therefore spacing by reducing fin increases the quantity of fin.In the same manner, along the first fin 18, from End is arrived, the quantity of radiating is fewer and feweri, therefore reduces the quantity of fin accordingly in the middle part of circular arc.By being arranged such, permissible Greatly improve radiating efficiency, simultaneously great material-saving.

Preferably, the midpoint from the end points of circular arc to circular arc, between the second fin 19 that two sides of circular arc extend The amplitude that reduces of distance less and less, from the midpoint of circular arc to the end of the first fin 18, extend from the first fin 18 the The amplitude that the distance between two fins 20 increase is increasing.It is found through experiments, by above-mentioned setting, with increase or minimizing Amplitude is identical to be compared, it is possible to increase about 15% radiating effect.Therefore there is good radiating effect.

Preferably, although the width of the second fin or distance change, it is preferred that still conform to above-mentioned The regulation of optimum formula.

Preferably, as shown in figure 8, on the first and/or second fin providing holes 24, for destroying laminar sublayer.Mainly Reason is that the second fin mainly carries out heat exchange by the convection current of air, and air carries out free convection from the bottom up of the second fin Flowing, during air flows upwards, the thickness of boundary region constantly becomes big, or even finally results in adjacent second fin Between boundary region overlapped, this kind of situation can lead to the deterioration of heat exchange.Therefore border can be destroyed by providing holes 24 Layer, thus augmentation of heat transfer.

Preferably, the shape in hole 24 is semicircle or circular.

Preferably, the thickness of the whole fin of hole 24 insertion, as shown in Figure 8.

As one preferably, along the direction of the flowing of air, i.e. the top from the bottom of fin to radiator, hole 9 Density（I.e. quantity）Constantly increase.Main cause is the direction of the flowing along air, and the thickness of boundary region constantly increases, Therefore pass through to arrange the density in ever-increasing hole 9, so that constantly increasing to the destructiveness of boundary region, thus strengthening Heat transfer.

Preferably, the density in hole 9 place the closeest is 1.26-1.34 times of the density in place the thinnest, preferably 1.28 Times.

Although the present invention is disclosed as above with preferred embodiment, the present invention is not limited to this.Any art technology Personnel, 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 When being defined by claim limited range.

Claims (2)

1. a kind of station boiler bootstrap system of setting ancillary heating equipment, described system includes 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 passes through side The outlet of road flue is discharged after flowing into flue collector；

Described heat exchanger connects radiator, and described radiator is convector, and the flue gas in described heat exchanger is by heat transfer To the water of radiator, thus realizing carrying out heat supply using waste heat；

Ancillary heating equipment is arranged on the entrance pipe of described radiator, enters the water in radiator for heating；

The fin that described radiator includes upper header and lower collector pipe and its is located at the circular section between upper header and lower collector pipe Pipe, the fin that described finned tube includes base tube and is located at base tube periphery, described base tube is the passage of radiused cross-section, described Fin includes the first fin and the second fin, and described first fin is to stretch out from the midpoint of circular arc, described second fin bag Include the multiple fins stretch out from the multiple fins extending outwardly at the circular arc place of circular arc and from the first fin, to The second fin that same direction extends is parallel to each other, the base of line formation of circular arc two-end-point, the first fin, the second fin The end extending forms isosceles triangle；Described substrate tube arranges first fluid passage, setting the inside described first fin Two fluid passages, described first fluid passage and second fluid channel connection；

The face specular that described second fin is located with respect to the first fin center line, the distance of adjacent the second described fin For L1, the base length that the line of circular arc two-end-point is formed is W, and the length of the waist of described isosceles triangle is S, meets as follows Formula：

L1/S*100=A*Ln (L1/W*100)+B* (L1/W)+C, wherein Ln are logarithmic functions, and A, B, C are coefficients, 0.66<A< 0.70,21<B<24,3.3<C<5.2；

It is characterized in that：Described ancillary heating equipment is electric heating equipment,

Described system includes temperature sensor and central controller, and temperature sensor is arranged on the entrance of radiator, by temperature Sensor measurement enters the temperature of the water in radiator, central controller and temperature sensor and electric heating equipment data cube computation, If the temperature of the water of entrance radiator of temperature sensor measurement is too low, central controller automatic electric heating equipment.

2. station boiler bootstrap system as claimed in claim 1 it is characterised in that

0.06<L1/S<0.07,0.08<L1/W<0.10；

3mm<L1<5mm；

40mm <S<75mm；

30mm <W<50mm；

The midpoint of circular arc is a with the drift angle of the line formation of the two-end-point of circular arc, 100 °<a<160°.