CN105042624A - Flue-gas and air system and flow guide device, of flue-gas and air system, at cold secondary air inlet of air preheater - Google Patents
Flue-gas and air system and flow guide device, of flue-gas and air system, at cold secondary air inlet of air preheater Download PDFInfo
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- 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
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Abstract
The invention discloses a flow guide device at a cold secondary air inlet of an air preheater. The flow guide device is used for a thermal power plant and comprises a first connecting device which is used for being connected with an air feeder and has a certain dispersion angle. The outlet end of the first connecting device is circular. The flow guide device further comprises a flow dividing piece, bent pipes and square circular sections. The flow dividing piece is used for flow dividing and comprises a plurality of circular air pipes, and the inlet end of the flow dividing piece is connected with the outlet end of the first connecting device. The bent pipes are connected with the outlet ends of the circular air pipes of the flow dividing piece, and the number of the bent pipes is equal to the number of the circular air pipes of the flow dividing piece. The square circular sections are connected with the outlet ends of the bent pipes, and the number of the square circular sections is equal to the number of the bent pipes. According to the flow guide device, an original circular air pipe is changed into the multiple circular air pipes through the flow dividing piece, the evenness of air flow at the cold secondary air inlet of the air preheater is improved accordingly, and the heat exchange effect of the air preheater is improved accordingly. The invention further discloses a flue-gas and air system.
Description
Technical field
The present invention relates to cooling technology field, particularly relate to the guiding device of the cold Secondary Air entrance of a kind of air preheater.The invention still further relates to a kind of air and gas system comprising the guiding device of the cold Secondary Air entrance of above-mentioned air preheater.
Background technology
In the air and gas system in thermal power plant, boiler air preheater utilizes the flue gas heat of boiler tail to add the visual plant of hot-air.Air preheater utilizes the heat in flue gas to add hot-air, and air themperature is raised, and exhaust gas temperature reduces, not only decrease the flue gas loss of boiler, in addition, send into after air is heated in stove, make stove fuel catch fire rapidly, burning is completely strong, thus decreases the extent of damage of fuel.Therefore, the quality of the effect of the exchange heat of flue gas and air in boiler air preheater, will directly affect the efficiency of boiler.
In 600MW and above large-size thermal power plant unit, for boiler provides pressure fan many employings axial flow blower of cold Secondary Air, pressure fan is horizontally disposed more than level ground, boiler room.In normal use procedure, thermal power plant air preheater cold Secondary Air entrance often adopts the guiding device with the cold secondary air duct of rectangle or the guiding device with circular cold secondary air duct.As Figure 1-Figure 4, Fig. 1 is a kind of structure chart of guiding device when being connected with pressure fan with the cold secondary air duct of rectangle, and Fig. 2 is the front view of Fig. 1; Fig. 3 is a kind of structure chart of guiding device when being connected with pressure fan with circular cold secondary air duct, and Fig. 4 is the front view of Fig. 3.
The pressure fan 1 connected for above-mentioned two kinds of guiding devices all adopts round exit, the cold Secondary Air interface 3 of boiler air preheater is generally rectangular opening, and because be subject to the impact of heat exchange efficiency in air preheater, require the flow velocity that the flow velocity that cold Secondary Air enters air preheater exports far below pressure fan 1, therefore the area of the cold Secondary Air interface 3 of air preheater differs larger with pressure fan 1 discharge area.In addition, vertically downward, the absolute altitude of its interface surface is generally no more than 14m to the cold Secondary Air interface 3 of air preheater.Therefore, after air enters pressure fan 1, blade effect through pressure fan 1 is penetrated from the outlet level of pressure fan 1, in cold secondary air duct 2 through diffusion, 90 ° of turning upwards flow, then enter in air preheater from the cold Secondary Air interface 3 of air preheater after spreading and carry out heat exchange with flue gas.
Because the guiding device with circular cold secondary air duct has the advantage that bearing capacity is strong, consumptive material is few and vibration is less likely to occur, then there is the guiding device of circular cold secondary air duct compared with more conventional in the guiding device with the cold secondary air duct of rectangle.
Generally for the guide functions of raising 90 ° of elbows, reduce local resistance loss during rocket motor, need adopt slow turning head, the radius of curvature R of slow turning head is at least greater than 1D (for the guiding device with circular cold secondary air duct, D is the air channel diameter of guiding device).For the cold secondary air duct of conventional circular, cold secondary air duct 2 size is comparatively large, and when taking slow turning head, the straight section distance of air-flow to air preheater entrance after elbow is shorter, air-flow can be partial to outside elbow under centrifugal action, causes the air flow method entering air preheater uneven; And due to the distance of air channel to air preheater entrance after 90 ° of elbows too short, the anemostat in guiding device cannot meet the requirement that angle of flare need be less than 20 °.In the scheme of the cold secondary air duct of circle, the angle of flare of the circumference joint after 90 ° of elbows is about 40 °, this not only adds local resistance during Diffusion of gas stream, also make air-flow have little time diffusion and integrated distribution in the central area of air preheater interface, the air flow method causing entering air preheater is uneven.
For the phenomenon occurring said flow skewness when entering air preheater, design feature due to the guiding device with circular cold secondary air duct cannot realize in circular winding pipe, establish deflector to carry out the effect of water conservancy diversion, and therefore air-flow can not get solving in the skewness problem of the cold Secondary Air porch of air preheater.
Therefore, how to improve the uniformity of air-flow in the cold Secondary Air porch of air preheater, the heat transfer effect improving air preheater with this is those skilled in the art's technical issues that need to address.
Summary of the invention
In view of above problem, the invention provides the guiding device of the cold Secondary Air entrance of a kind of air preheater, this guiding device can improve the uniformity of air-flow in the cold Secondary Air porch of air preheater, can improve the heat transfer effect of air preheater with this.The present invention also provides a kind of air and gas system comprising the guiding device of the cold Secondary Air entrance of above-mentioned air preheater.
A guiding device for the cold Secondary Air entrance of air preheater, for thermal power plant, comprises first jockey with certain diffusion angle for being connected with pressure fan, and the port of export of described first jockey is circular, also comprises:
For the position of splitter with many circular ducts shunted, the arrival end of described position of splitter is connected with the port of export of described first jockey;
The bend pipe be connected with the port of export of the circular duct of described position of splitter, the quantity of described bend pipe is equal with the quantity of the circular duct of described position of splitter;
The circumference be connected with the port of export of described bend pipe saves, and the quantity of described circumference joint is equal with the quantity of described bend pipe.
The guiding device of the cold Secondary Air entrance of air preheater provided by the invention, relative to the guiding device with circular cold secondary air duct of the prior art, air-flow is by the situation originally flowing through a circular duct, become and flow through in many circular ducts of position of splitter, the bend pipe be then connected with the circular duct of position of splitter has had space of turning round fully, and the cross section of every root bend pipe is less, the elbow radius of the bend pipe in guiding device provided by the invention can be designed as the bending radius being greater than existing bend pipe, the larger resistance then suffered by air-flow of bending radius due to bend pipe is less, when the resistance be then subject to when air-flow diminishes, air-flow just increases in the uniformity of the cold Secondary Air entrance of air preheater, secondly, many bend pipes carry out 90 ° turn round after, then by little circumference joint, its angle of flare obviously reduces, and can be controlled within 20 °, thus reduces the local resistance of Diffusion of gas stream and ensure the uniformity of Diffusion of gas stream, simultaneously, in guiding device, air-flow is first divided into multiply air-flow by the position of splitter playing shunting action, be connected with air preheater respectively by multiple little circumference joint respectively by after many bend pipe water conservancy diversion again, the uniformity of the air-flow of air preheater porch can be made to be much improved, because the uniformity of air-flow in the cold Secondary Air porch of air preheater improves, thus improve the heat transfer effect of air preheater.
Wherein in an embodiment, the quantity of the circular duct of described position of splitter be greater than 1 natural square root.
Wherein in an embodiment, the circular duct of described position of splitter is evenly arranged in described position of splitter, and the described circular duct row formed of arranging is equal with columns.
Wherein in an embodiment, the quantity of the circular duct of described position of splitter is 4.
The quantity of the circular duct of position of splitter is 4, air-flow through four circular ducts enter four bend pipes carry out 90 ° turn round after, save Secondary Air entrance cold with air preheater respectively by little circumference to be again connected, the diffusion angle of the little circumference joint of every root just can control within 20 °, the local resistance of Diffusion of gas stream can be reduced and ensure the uniformity of air-flow local diffusion, then air-flow is improved in the uniformity of the cold Secondary Air entrance of air preheater, thus improves the heat transfer effect of air preheater.
Wherein in an embodiment, if the diameter of the arrival end of described position of splitter is D, the circulation area S=π * (D/2) of the arrival end of described position of splitter
2=1/4 π D
2, the diameter of each circular duct of described position of splitter is D/2, and the circulation area of each circular duct of described position of splitter is S1=π * (D/2/2)
2=1/16 π D
2.
Wherein in an embodiment, the bent tube section that described bend pipe comprises the first straight-tube portion, the second straight-tube portion and is arranged between described first straight-tube portion and described second straight-tube portion, welds between described first straight-tube portion, described second straight-tube portion and described bent tube section.
Wherein in an embodiment, described first straight-tube portion being positioned at the described bend pipe of inner side is shorter than the first straight-tube portion of the described bend pipe being positioned at outside, and the second straight-tube portion being positioned at the described bend pipe of inner side is shorter than the second straight-tube portion of the described bend pipe being positioned at outside.
Wherein in an embodiment, be all set to maintain a certain distance in level and vertical direction between the outer wall of each circular duct of described position of splitter.
Wherein in an embodiment, also comprise the second jockey be arranged between described first jockey and described position of splitter, described second jockey becomes straight-tube shape.
Between the first jockey and position of splitter, be provided with the second jockey, position of splitter can be avoided directly to be connected with the first jockey, and the second jockey of straight-tube shape serves the effect of a middle transition.
A kind of air and gas system, for thermal power plant, comprise pressure fan and air preheater, also comprise the guiding device described in above-mentioned any one, one end of described guiding device is connected with described pressure fan, and the other end of described guiding device is connected with described air preheater.
Accompanying drawing explanation
Fig. 1 is a kind of structure chart of guiding device when being connected with pressure fan with the cold secondary air duct of rectangle;
Fig. 2 is the front view of Fig. 1;
Fig. 3 is a kind of structure chart of guiding device when being connected with pressure fan with circular cold secondary air duct;
Fig. 4 is the front view of Fig. 3;
The structure chart of guiding device when being connected with pressure fan of the cold Secondary Air entrance of air preheater that Fig. 5 provides for the embodiment of the present invention;
Fig. 6 is the front view of Fig. 5;
Fig. 7 is the right view of Fig. 5;
Fig. 8 is the top view of Fig. 5;
The stereogram of the position of splitter that Fig. 9 provides for the embodiment of the present invention;
The stereogram of the bend pipe that Figure 10 provides for the embodiment of the present invention;
The stereogram of the circumference joint that Figure 11 provides for the embodiment of the present invention;
The front view of the position of splitter that Figure 12 provides for the embodiment of the present invention;
The top view of the position of splitter that Figure 13 provides for the embodiment of the present invention.
Detailed description of the invention
Core of the present invention is to provide the guiding device of the cold Secondary Air entrance of a kind of air preheater, and this guiding device can improve the uniformity of air-flow in the cold Secondary Air porch of air preheater, can improve the heat transfer effect of air preheater with this.Another core of the present invention is to provide a kind of air and gas system comprising the guiding device of the cold Secondary Air entrance of above-mentioned air preheater.
As shown in Figure 5-Figure 8, the structure chart of guiding device when being connected with pressure fan of the cold Secondary Air entrance of air preheater that provide for the embodiment of the present invention of Fig. 5; Fig. 6 is the front view of Fig. 5; Fig. 7 is the right view of Fig. 5; Fig. 8 is the top view of Fig. 5.
The guiding device of the cold Secondary Air entrance of the air preheater that the embodiment of the present invention provides, it is circular for comprising the port of export with the first jockey 4, first jockey 4 of certain diffusion angle be connected with pressure fan 1, also comprises:
For the position of splitter 5 with many circular ducts shunted, the arrival end of position of splitter 5 is connected with the port of export of the first jockey 4;
The bend pipe 6 be connected with the port of export of the circular duct of position of splitter 5, the quantity of bend pipe 6 is equal with the quantity of the circular duct of position of splitter 5;
The circumference be connected with the port of export of bend pipe 6 saves 7, and the quantity of circumference joint 7 is equal with the quantity of bend pipe 6.
Multiple circumference joints 7 that the embodiment of the present invention provides can be independently, multiple joint 7 that independently has an area of can be linked together by certain molding mode, as welding, certainly, multiple circumference joints 7 that the embodiment of the present invention provides also can be integrally manufactured, namely be exactly an entirety when multiple circumference joint 7 creates, do not need to use other connected modes to be connected together by multiple circumference joint 7 again.
For being parts separately between position of splitter 5, bend pipe 6 and circumference joint 7, be then assembled to together; Certainly, also can be one-body molded between position of splitter 5, bend pipe 6 and circumference joint 7 three.
The guiding device of the cold Secondary Air entrance of the air preheater that the embodiment of the present invention provides, relative to the guiding device with circular cold secondary air duct of the prior art, air-flow is by the situation originally flowing through a circular duct, become and flow through in many circular ducts of position of splitter 5, the bend pipe 6 be then connected with the circular duct of position of splitter 5 has had space of turning round fully, and the cross section of every root bend pipe 6 is less, the elbow radius of the bend pipe 6 in guiding device provided by the invention can be designed as the bending radius being greater than existing bend pipe, the larger resistance then suffered by air-flow of bending radius due to bend pipe 6 is less, when the resistance be then subject to when air-flow diminishes, air-flow just increases in the uniformity of the cold Secondary Air entrance of air preheater, secondly, many bend pipes 6 carry out 90 ° turn round after, then by little circumference joint 7, its angle of flare obviously reduces, and can be controlled within 20 °, thus reduces the local resistance of Diffusion of gas stream and ensure the uniformity of Diffusion of gas stream.Simultaneously, in guiding device, the position of splitter 5 that air-flow has first passed through shunting action is divided into multiply air-flow, be connected with air preheater respectively by multiple little circumference joint 7 respectively by after many bend pipes 6 water conservancy diversion again, the airflow homogeneity of air preheater porch can be made to be much improved, because the uniformity of air-flow in the cold Secondary Air porch of air preheater improves, thus improve the heat transfer effect of air preheater.
First jockey 4 of above-mentioned indication has certain diffusion angle, be different with the diameter of its port of export from the arrival end of the first jockey 4 that pressure fan 1 connects, the diameter of arrival end is less than the diameter of the port of export, namely in the first jockey 4, air-flow can carry out diffusion to a certain degree, thus can ensure that cold Secondary Air enters the flow velocity of air-flow velocity far below the outlet of pressure fan 1 of air preheater flow through the cold secondary air duct of guiding device formation at air-flow after.
Above-mentioned " arrival end " and " port of export " is all that the direction of foundation air-flow sets, and namely the upstream end of air-flow is arrival end, and the outflow end of air-flow is the port of export.
The arrival end of position of splitter 5 is the one end be connected with the first jockey 4, and the port of export of position of splitter 5 is provided with many circular ducts, and namely position of splitter 5 has multiple port of export.
The arrival end of the circular duct of position of splitter 5 is connected with the body of position of splitter 5, and the body of position of splitter 5 refers to the little cylindrical parts being in its arrival end of position of splitter 5.
Circumference joint 7, be round entrance end below being, top is the parts of square outlet end, and square can the guarantee be designed to above is docked fully with air preheater.
Further, the quantity of the circular duct of position of splitter 5 can be 2, when position of splitter 5 has two circular ducts, air-flow can be shunted, thus the uniformity of air-flow in the cold Secondary Air porch of air preheater can be improved, the heat transfer effect of air preheater can be improved with this.
The quantity of the circular duct of certain position of splitter 5 can for the natural square root being greater than 1, namely the quantity of the circular duct of position of splitter 5 can be 4,9,16,25 or 36 etc., namely the quantity of circular duct can be the quantity root of natural square except 1, and the circular duct of position of splitter 5 is evenly arranged in position of splitter 5, the circular duct row formed of arranging is equal with columns.
The row of circular duct is equal with columns both can ensure the easy for installation of position of splitter 5, can ensure again the uniformity coefficient shunted.
As Figure 9-Figure 11, the stereogram of position of splitter that provides for the embodiment of the present invention of Fig. 9; The stereogram of the bend pipe that Figure 10 provides for the embodiment of the present invention; The stereogram of the circumference joint that Figure 11 provides for the embodiment of the present invention.
The quantity that can set the circular duct of position of splitter 5 on above-mentioned basis is further 4, then the quantity of corresponding bend pipe 6 is also four, and the number of circumference joint 7 is also four.
When the quantity of the circular duct of position of splitter 5 is 4, suppose that the duct dimension of single large circular duct is that (wherein D is pipeline outer wall diameter to Φ DmmxSmm, S is the wall thickness of pipeline), namely the duct dimension of the arrival end of position of splitter 5 is Φ DmmxSmm.
As shown in Figure 8, the internal diameter size of the cold Secondary Air interface 3 of air preheater is that (wherein A is perpendicular to pressure fan Way out size to AmmxBmm, B is the size being parallel to pressure fan Way out), the direction being parallel to pressure fan outlet is the flow direction of wind in pressure fan 1, and the direction perpendicular to pressure fan outlet is the direction perpendicular with the flow direction of wind in pressure fan 1.
According to the duct dimension of above-mentioned single circular duct, one one of composition Novel flow guide device is divided into position of splitter 5, four bend pipes 6 of the circular duct of four, and the accessory size of four circumference joints 7 can be determined by following principle:
The circulation area S=π * (D/2) of single circular duct before shunting
2=1/4 π D
2; After shunting, the circulation area of single circular duct is S1=π * (D/2/2)
2=1/16 π D
2, shunt the circulation gross area S=4S1=1/4 π D of rear four little circular ducts
2.Therefore, the circulation area of the circular cooling duct before and after shunting is the same.
As shown in FIG. 12 and 13, the front view of position of splitter that provides for the embodiment of the present invention of Figure 12; The top view of the position of splitter that Figure 13 provides for the embodiment of the present invention.
The center line of the small circular airduct after four shuntings is relative to the location dimension d of center line in vertical ground direction of large circular duct before shunting, only need from welded and installed angle consideration easily, can value d=(1.01D ~ 1.05D)/4, make the outer wall of upper and lower two small circular airducts keep certain distance.
And the center line of small circular airduct after four shuntings is relative to the center line location dimension c in the horizontal direction of large circular duct before shunting, then depend on the cold Secondary Air interface 3 internal diameter size A of air preheater.Can c=A/4 be made, make the center line maintenance of the bend pipe 6 after position of splitter 5, circumference joint 7 point-blank.The length L of position of splitter 5, the foundation of its value will ensure that the angle of flare of position of splitter is not more than 20 ° exactly, can meet the requirement of DL/T5121-2000 " thermal power plant cigarette wind pulverized coal channel designing technique code ".
The angle of flare of above-mentioned position of splitter 5 is: with the mass axis of position of splitter for normal line, and the port of export of position of splitter 5 is to the straight line of its arrival end and normal line angulation.
The caliber being in position of splitter 5 four bend pipes 6 is below Φ D/2mmxSmm.Bend pipe 6 can turn bend design by slow, and the value of its radius of curvature R is the air channel diameter of 1 ~ 1.5 times.
Further, the bent tube section that above-mentioned bend pipe 6 can comprise the first straight-tube portion, the second straight-tube portion and be arranged between the first straight-tube portion and the second straight-tube portion, welds between the first straight-tube portion, the second straight-tube portion and bent tube section.
The length of the first straight-tube portion of bend pipe 6, the second straight-tube portion and position of splitter 5 can be determined according to the profile of front and back part and position, ensures that each part connects smoothly.
The size of the rectangular interface of the circumference joint 7 after four little welding bend pipes 6 can be undertaken dividing equally consideration by the internal diameter size (AmmxBmm) of the cold Secondary Air interface 3 of air preheater, then the rectangular duct of each little circumference joint 7 is of a size of A/2mmxB/2mmxSmm.And the value foundation having an area of the length of joint 7 wants the angle of flare of guarantor's round knot 7 to be not more than 20 ° exactly.
The angle of flare of above-mentioned circumference joint 7 is the angle of inclination of circular portion to rectangle part.
When having a situation of 9 or 16 or other quantity root circular ducts for position of splitter 5, its position of splitter 5, bend pipe 6, and the size of circumference joint 7 also can design according to the situation with four circular ducts.
Further, in order to ensure the measure-alike of used circumference joint 7, first straight-tube portion that can arrange the bend pipe 6 being positioned at inner side is shorter than the first straight-tube portion of the bend pipe 6 being positioned at outside, and the second straight-tube portion being positioned at the bend pipe 6 of inner side is shorter than the second straight-tube portion of the bend pipe 6 being positioned at outside.
Further, the second jockey 8, the second jockey 8 one-tenth straight-tube shapes be arranged between the first jockey 4 and position of splitter 5 are also comprised.Between the first jockey 4 and position of splitter 5, be provided with the second jockey 8, position of splitter 5 can be avoided directly to be connected with first fill 4 to put and be connected, the second jockey 8 of straight-tube shape serves the effect of a middle transition.
Finally obtain optimum embodiment provided by the present invention, position of splitter 5 comprises four circular ducts, and four circular ducts weld bend pipe 6 be connected with four, and four welding bend pipes 6 have an area of joint 7 be connected with four.Bend pipe 6 comprises the first straight-tube portion, the second straight-tube portion and bent tube section, its angle of bend is 90 °, the first straight-tube portion being positioned at the bend pipe 6 of inner side is shorter than the first straight-tube portion of the bend pipe 6 being positioned at outside, and the second straight-tube portion being positioned at the bend pipe 6 of inner side is shorter than the second straight-tube portion of the bend pipe 6 being positioned at outside; Weld between each several part of bend pipe 6; And between the first jockey 4 and position of splitter 5, be provided with the second jockey 8 played a transition role.
The guiding device that the embodiment of the present invention provides, air-flow is by after position of splitter 5 shunting of a point four, the welding bend pipe 6 that every root is little has had space of turning round fully, and the cross section of single circular weld bend pipe 6 is less, the bending radius of bend pipe 6 can be designed as the air channel diameter (the larger then resistance of bending radius of bend pipe is less) of 1 ~ 1.5 times, have better guide functions, the flow field uniformity after circular weld bend pipe 6 in same distance is better.Four little circular weld bend pipes 6 carry out 90 ° turn round after, then by little circumference joint 7 respectively Secondary Air entrance cold with air preheater be connected.The diffusion angle of the little circumference joint 7 behind the air channel of the circular duct that every root is little just can control within 20 °, can reduce the local resistance of Diffusion of gas stream and ensure the uniformity of Diffusion of gas stream.Simultaneously, in Novel flow guide device, air-flow is first divided into four strands of air-flows by the position of splitter 5 of a point four, again respectively by after four little circular weld bend pipe 6 water conservancy diversion, again by four little circumference joints 7 respectively Secondary Air entrance cold with air preheater be connected, the uniformity of the air-flow after bend pipe 6 at least improves more than 1 times than single large circular winding pipe.Therefore, the diversion air duct of Novel flow guide device makes the uniformity of air preheater porch air-flow be very significantly improved, and improves the heat exchange efficiency of boiler air preheater equipment.
For certain typical 600MW thermal power generation unit, Novel flow guide device compares its drag reduction 30Pa than originally traditional guiding device with circular cold secondary air duct, considerably reduces equipment operating cost.
Above thermal power plant provided by the present invention air preheater cold Secondary Air entrance Novel flow guide device is described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. the guiding device of the cold Secondary Air entrance of air preheater, for thermal power plant, comprise first jockey (4) with certain diffusion angle for being connected with pressure fan (1), the port of export of described first jockey (4) is circular, it is characterized in that, also comprise:
For the position of splitter (5) with many circular ducts shunted, the arrival end of described position of splitter (5) is connected with the port of export of described first jockey (4);
The bend pipe (6) be connected with the port of export of the circular duct of described position of splitter (5), the quantity of described bend pipe (6) is equal with the quantity of the circular duct of described position of splitter (5);
The circumference be connected with the port of export of described bend pipe (6) saves (7), and the quantity of described circumference joint (7) is equal with the quantity of described bend pipe (6).
2. guiding device according to claim 1, is characterized in that, the quantity of the circular duct of described position of splitter (5) be greater than 1 natural square root.
3. guiding device according to claim 2, is characterized in that, the circular duct of described position of splitter (5) is evenly arranged in described position of splitter (5), and the described circular duct row formed of arranging is equal with columns.
4. guiding device according to claim 3, is characterized in that, the quantity of the circular duct of described position of splitter (5) is 4.
5. guiding device according to claim 4, is characterized in that, if the diameter of the arrival end of described position of splitter (5) is D, and the circulation area S=π * (D/2) of the arrival end of described position of splitter (5)
2=1/4 π D
2, the diameter of each circular duct of described position of splitter (5) is D/2, and the circulation area of each circular duct of described position of splitter is S1=π * (D/2/2)
2=1/16 π D
2.
6. guiding device according to claim 1, it is characterized in that, the bent tube section that described bend pipe (6) comprises the first straight-tube portion, the second straight-tube portion and is arranged between described first straight-tube portion and described second straight-tube portion, welds between described first straight-tube portion, described second straight-tube portion and described bent tube section.
7. guiding device according to claim 6, it is characterized in that, described first straight-tube portion being positioned at the described bend pipe (6) of inner side is shorter than the first straight-tube portion of the described bend pipe (6) being positioned at outside, and the second straight-tube portion being positioned at the described bend pipe (6) of inner side is shorter than the second straight-tube portion of the described bend pipe (6) being positioned at outside.
8. guiding device according to claim 1, is characterized in that, is all set to maintain a certain distance between the outer wall of each circular duct of described position of splitter (5) in level and vertical direction.
9. the guiding device according to any one of claim 1-8, it is characterized in that, also comprise the second jockey (8) be arranged between described first jockey (4) and described position of splitter (5), described second jockey (8) becomes straight-tube shape.
10. an air and gas system, for thermal power plant, comprise pressure fan (1) and air preheater, it is characterized in that, also comprise the guiding device as described in any one of claim 1-9, one end of described guiding device is connected with described pressure fan (1), and the other end of described guiding device is connected with described air preheater.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN105333451A (en) * | 2015-11-25 | 2016-02-17 | 中国能源建设集团广东省电力设计研究院有限公司 | Cold air feeding device for air preheater of thermal power plant |
| CN105351954A (en) * | 2015-11-25 | 2016-02-24 | 中国能源建设集团广东省电力设计研究院有限公司 | Flue system for outlet of tower-type furnace air pre-heater of thermal power plant |
| CN110449092A (en) * | 2019-08-19 | 2019-11-15 | 中国科学技术大学 | A kind of fluidized-bed air-inlet system |
| CN110449092B (en) * | 2019-08-19 | 2021-04-23 | 中国科学技术大学 | Fluidized bed air inlet system |
| CN113654068A (en) * | 2021-09-13 | 2021-11-16 | 上海市特种设备监督检验技术研究院 | Coal fired boiler desulfurization system inlet flue |
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