CN116401891A - Optimization method for connection mode and spatial arrangement of fan and smoke system of power plant - Google Patents
Optimization method for connection mode and spatial arrangement of fan and smoke system of power plant Download PDFInfo
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- 239000000779 smoke Substances 0.000 title claims abstract description 60
- 238000005457 optimization Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000006872 improvement Effects 0.000 claims abstract description 5
- 239000000428 dust Substances 0.000 claims description 18
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- 239000000843 powder Substances 0.000 abstract description 6
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- 239000002817 coal dust Substances 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 7
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- 229910000831 Steel Inorganic materials 0.000 description 4
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
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- 239000003546 flue gas Substances 0.000 description 1
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Abstract
The invention discloses an optimization method for connection mode and space arrangement of a power plant air-smoke system, which is one of the most important systems of a power plant and mainly comprises a primary air duct, a secondary air duct, a flue and a powder feeding pipeline. According to the invention, by respectively carrying out simulation calculation on each part of air duct, analyzing and optimizing modification are carried out on the existing primary air duct, secondary air duct, flue and powder feeding pipeline of the air-smoke system of a certain power plant, parts with larger resistance are found out, unreasonable connection mode and space arrangement mode are adopted, and space arrangement mode with smaller resistance is provided, so that the aim of optimizing operation is achieved. After finishing the improvement, the design level of the boiler smoke and coal dust pipeline of the power plant and the actual running efficiency of the fan are improved, and the method has very important significance for optimizing the running of the plant and saving energy and reducing emission.
Description
Technical Field
The invention relates to an optimization technical method for a wind and smoke system of a certain power plant, in particular to an optimization method for a connection mode and spatial arrangement of the wind and smoke system of the power plant.
Background
The wind and smoke system is one of the most important systems of the power plant, and the stable operation of the wind and smoke system has important influence on the economy of the power plant and the stability of the whole plant. At present, the importance of smoke channel design and resistance calculation is not realized in the power plant economy research, and the research method of the smoke coal powder pipeline of the power plant at the present stage mainly comprises the following steps: on one hand, the design and calculation are still carried out along the old standard and calculation method; on the other hand, the optimization of the smoke and wind channel is focused on the selection of the fan, the selection of the margin of the fan and the transformation of the air leakage of the smoke and wind channel, and the method which is often adopted is to adopt an experimental method to test the smoke and wind system of the power station boiler as a research object, analyze the energy consumption of the induced draft fan, find out the reason of the low operation efficiency of the fan and conduct targeted transformation; in addition, experimental researches and analyses are carried out on the blower, the induced draft fan, the flue gas dust remover and the powder making system, and a modification method is provided for reducing energy consumption and improving efficiency. However, the researches neglect that the fan is selected improperly due to calculation errors of the resistance of the smoke channel, and neglect the improvement and optimization of parts with larger resistance to the smoke and coal powder pipeline.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an optimization method for the connection mode and the spatial arrangement of the electric plant wind and smoke system, and the method improves the efficiency of the electric plant wind and smoke system by improving the connection mode and the spatial arrangement of the electric plant wind and smoke system, thereby having important significance for the economy of the whole plant.
In order to achieve the above object, the present invention adopts the following technical method:
the scheme A is that square pipes are transformed into round pipes, space optimization is carried out at the same time, and three continuous elbows arranged in the original scheme are replaced by two bent pipes and a section of space inclined pipe; the scheme B is that under the condition of space permission, the positions of the fans are rearranged to reduce two elbows, and meanwhile, the turning angle of the elbow in front of the inlet of the air preheater is reduced, so that the resistance is reduced; the scheme C is that the conical diffusion pipe is changed into a tower-shaped diffusion pipe on the basis of the scheme B, so that the elbow of the inlet of the air conditioner is changed from a diffusion elbow into a common elbow; the scheme D is that the scheme B is changed into a round tube from a rectangular tube under the condition of unchanged area;
the optimization of the flue of the primary air system of the air and smoke system of the electric plant comprises that in order to reduce the use of one elbow, the scheme A replaces the original Z-shaped elbow with a 45-degree elbow, and in the scheme B, all rectangular pipes of the section are changed into circular pipes on the basis of the scheme A;
the optimization of the outlet of the air preheater of the air-smoke system of the electric plant to the inlet of the primary hot air main pipe in front of the furnace comprises the steps of firstly reducing the distance between the second elbow and the shrinkage pipe and simultaneously reducing the turning radius of the second elbow; secondly, reducing the distance between the space elbows to enable L/b=2-4, wherein L is the length of a transition section of the connection of the two elbows, and b is the diameter of the section of the pipeline; finally, the space obtained by optimization is utilized to reform the right-angle elbow and the sharp elbow into slow-turning elbows and adjust the distance between the right-angle elbow and the sharp-turning elbows;
the optimization of the flue of the hot secondary air system of the air and smoke system of the electric plant comprises the steps of changing a contracted right-angle elbow into a contracted corner-cut elbow or a slow turning head by transformation, and optimizing the distance between the arrangement and the next elbow, wherein L/b=3.5, so that the resistance of the section is reduced; the resistance of the groove is equivalent to that of the section shrink and shrink reducing pipe, so that a chamfer or a round angle is added at the shrink opening or the shrink opening, and the streamline can be slowly transited;
the optimization for the outlet of the flue air preheater to the inlet of the dust remover of the power plant comprises the following aspects: each channel of the flue is provided with only two elbows, the turning angles of the elbows are the same and are 30 degrees, meanwhile, the length of the flue is shortened, and the total length is changed into 2/3 of the original total length;
the improvement optimization of the dust remover outlet to the induced draft fan inlet of the fan system of the power plant comprises the following aspects: firstly, the combination of the original pipelines is changed into the first turning and then the combination, so that the collision of fluid is avoided; secondly, changing a rectangular pipe in the original pipeline into a circular pipe; and finally, carrying out space optimization transformation on a space elbow formed by continuous turning, wherein the included angle of the converging section of the two flues is changed from the original relative arrangement to 60 degrees, and the angle between the inlet section of the flue and the converging section is changed from the original 90 degrees to 135 degrees.
The invention has the following advantages:
the invention provides an optimization method aiming at a connection mode and a spatial arrangement of a wind and smoke system of a power plant. The result shows that the improvement of the wind and smoke system of the power plant reduces the economic cost of the thermal power plant, saves resources, has extremely high economic benefit and environmental protection value, and provides effective guarantee for safe and efficient production of the power plant.
Drawings
FIG. 1 shows a primary air duct of a fan and smoke system for optimizing the connection mode and the spatial arrangement of the fan and smoke system of a power plant.
Fig. 2a and fig. 2B are an optimization scheme a and an optimization scheme B of a primary air duct of a fan-smoke system according to the optimization method of the connection mode and the spatial arrangement of the fan-smoke system of the present invention.
Fig. 3a and fig. 3b are an optimizing scheme C and an optimizing scheme D of a primary air duct of a fan-smoke system according to the optimizing method of the fan-smoke system connection mode and the space arrangement of the present invention.
FIG. 4 shows a primary hot air duct of a fan and smoke system according to the method for optimizing the connection mode and the spatial arrangement of the fan and smoke system of a power plant.
Fig. 5a, fig. 5B and fig. 5c are a primary hot air duct scheme, a transformation scheme a and a transformation scheme B of the air and smoke system according to the optimization method of the connection mode and the spatial arrangement of the air and smoke system of the electric plant.
FIG. 6 shows the outlet of the air preheater of the air-smoke system to the inlet of the primary hot air duct in front of the furnace for the optimization method of the connection mode and the spatial arrangement of the air-smoke system of the electric power plant.
FIG. 7 shows the outlet of the air preheater of the air-smoke system to the inlet of the furnace front heat secondary air header of the air-smoke system according to the optimization method of the connection mode and the spatial arrangement of the air-smoke system of the electric power plant.
Fig. 8a and 8b are perspective views of a dust collector inlet and a modified dust collector inlet flue of a wind and smoke system of a power plant according to the wind and smoke system of the invention and the wind and smoke system of the invention.
Fig. 9a and 9b are vector diagrams of the inlet flue velocity of the dust collector of the air and smoke system and the inlet flue velocity of the improved dust collector of the air and smoke system of the optimizing method aiming at the connection mode and the spatial arrangement of the air and smoke system of the electric plant.
Fig. 10a and fig. 10b are an original scheme and a modification optimization scheme of a pipeline from an outlet of a dust remover of a fan system to an inlet of a draught fan, aiming at the optimization method of the connection mode and the spatial arrangement of the fan system of a power plant.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
In the subsystem of the thermal power plant, the boiler pulverized coal and pulverized coal system plays a role in transporting and distributing boiler pulverized coal and pulverized coal. Most of modern power station fans are high-efficiency fans, the highest efficiency is more than 85%, but the actual running efficiency is often lower; due to the restriction of the space of the power plant and the restriction of the manufacturing conditions of the pipeline, the pipeline space arrangement of the wind and smoke system of the power plant is often compact, the pipeline commonly adopts a rectangular pipeline, namely, the design of the boiler wind and coal dust pipeline is unreasonable and the fan is misselected to cause mismatching of the fan and the wind and smoke system. Therefore, stall, surge, even galloping and the like occur in the operation of part of fans. The improper fan type selection is caused by the imperfect fan type selection design method and inaccurate resistance of a smoke system, an air quantity and a smoke and air system calculated in the power plant design process. Through improving the spatial arrangement form and the pipeline modification of the wind and smoke pipeline of the power plant, the design level and the actual operation efficiency of the wind and the smoke and coal powder pipeline of the power plant can be obviously improved, and the method has very important significance for optimizing operation, saving energy and reducing emission of the power plant.
Aiming at the operation characteristics of a wind and smoke system of a certain power plant, the following power plant wind and smoke system optimization method is provided to solve the defects of low efficiency and high loss of the wind and smoke system.
FIG. 1 shows a cold primary air system duct of a power plant, wherein the duct has a diffuser rear elbow and a space elbow, and the rear elbow in the space elbow is a diffuser elbow. The diffusion tube is connected with the elbow directly, so that the resistance is increased, and the flow is uneven. The distance between the two subsequent space bends is not within the optimal distance of L/b=2-4, so that the design of the section of air duct is unreasonable and reasonable modification is needed.
The scheme A is as shown in figure 2a, by reforming the square tube into a round tube and simultaneously carrying out space optimization, and replacing three continuous elbows arranged in the original scheme with two bent tubes and a section of space inclined tube; scheme B as shown in FIG. 2B, the resistance is reduced by rearranging the position of the blower to reduce the two bends and simultaneously reduce the turning angle of the bend in front of the inlet of the air preheater under the condition of space allowance; scheme C is as shown in FIG. 3a, in order to change the conical diffusion pipe into a tower-shaped diffusion pipe on the basis of scheme B, so that the elbow of the inlet of the air preheater is changed from a diffusion elbow into a common elbow; scheme D is shown in fig. 3B, where scheme B is changed from rectangular tube to circular tube under the condition of constant area.
The comparison of the original solution and the optimized solution shows that the solution A reduces the number of bends, but the total resistance value is not reduced. The adoption of the scheme has the advantages that the length of the flue is reduced, so that the consumption of steel is reduced, and the manufacturing cost is saved. The reason why the resistance is not reduced but increased is that the connection mode of the bend and the diffusion pipe existing in front of the inlet of the hollow preheater in the scheme is changed from the original turning plane and the diffusion plane which are not in the same plane to the same plane, so that the resistance is increased. The scheme B and the scheme C can effectively reduce the resistance, and the scheme B and the scheme C can reduce the resistance by about 50 Pa. However, the amount of steel consumed by the use of scheme B is significantly reduced compared to that of scheme C, and thus the cost can be greatly reduced. Therefore, the scheme B also provides a new idea for optimizing the tower-shaped diffusion pipe. Compared with the scheme B, C, the scheme D has smaller resistance, can reduce the resistance by about 70Pa, and has smaller steel consumption, so that the use of the round tube in the cold primary air duct instead of the rectangular tube can reduce the resistance, realize the economic operation target and reduce the manufacturing cost.
Two optimization schemes are provided for the primary hot air duct shown in fig. 4 and 5a, one elbow is reduced in the modification scheme A shown in fig. 5B, the original Z-shaped elbow is replaced by one 45-degree elbow, and all rectangular pipes of the section are changed into round pipes on the basis of the scheme A in the scheme B shown in fig. 5 c. Numerical simulation calculation shows that the original scheme has obvious low-speed flow areas near the concave surfaces of the two elbows of the Z-shaped elbow and the inner wall of the outlet of the Z-shaped elbow, vortex areas are easy to form in the areas, and the modification scheme has no obvious vortex areas. And when the whole section adopts the scheme B with round pipes, the resistance is only about one third of that of the original scheme, and the drag reduction effect is obvious.
Fig. 6 is a perspective view of an air duct from an outlet of the air preheater to an inlet of a primary hot air duct in front of a furnace of the power plant, and it can be found that an unreasonable component design, special-shaped piece connection and space arrangement exist in the original air duct, so that the flow loss is large, and phenomena such as blockage and the like possibly exist, so that the resistance of an actual test result is large, and the resistance loss cause of the section of air duct can be categorized into the following points:
1) The original flue has a right angle bend and a sharp bend, the speed vector diagram shows that the speed at the right angle bend and the outer corner of the sharp bend is obviously smaller than the speed value of other parts, and the flow diagram and the speed vector diagram show that obvious vortex exists at the right angle bend and the outer corner of the sharp bend;
2) The continuous arranged elbows exist, the channel is provided with two space elbows and a Z-shaped elbow, the previous simulation shows that the distance between the space elbows has an optimal value, the distance is generally optimal between 2 and 4, but the distance arrangement of the space elbows in the original scheme is unreasonable;
3) The second turning radius is larger from the air preheater outlet, but as is known from the slow turning resistance coefficient curve, the change in resistance coefficient is small when R/b is greater than 2, so that the turning radius can be reduced appropriately to provide space for the next turn and the distance between them.
4) There is a continuous arrangement of shrink-followed turns in the air preheater outlet section, and the value of resistance to successive turns after shrink-tubing increases as the distance between them increases, as known from profile connections. Therefore, firstly, the distance between the shrinkage tube and the elbow can be properly reduced, so that on one hand, the connection resistance between the shrinkage tube and the elbow is reduced; on the other hand, the distance between the shrinkage pipe and the elbow is reduced, and space is provided for the subsequent reconstruction of the right-angle elbow. And secondly, the resistance of the shrinkage tube is reduced by lengthening the length of the shrinkage tube, and the distance between the shrinkage tube and the elbow is reduced, so that the total resistance is reduced.
Based on the analysis, a reconstruction scheme can be obtained, firstly, the distance between the second elbow and the shrinkage tube is properly reduced, and meanwhile, the turning radius of the second elbow is properly reduced; secondly, reducing the distance between the space elbows so that L/b=2-4; and finally, fully utilizing the space obtained by optimization to reform the right-angle elbow and the sharp-turn elbow into slow-turn elbows and adjust the distance between the right-angle elbow and the sharp-turn elbow.
FIG. 7 shows the flow line and velocity vector from the air preheater outlet to the inlet of the furnace front hot secondary air header, and the related data obtained by numerical simulation method according to the optimized pipeline space structure, and the conclusion is: there is a significant swirl at the upper and lower corners of the tee and at the recess of the channel before the header inlet. The swirl at the tee is mainly because the flow turns around a right angle, which is equivalent to a contracted elbow in terms of separation, and an elbow exists behind the elbow to form a space elbow, so the main method for reducing the resistance at the space elbow is to change the contracted elbow into a contracted corner or a slow turning head by modifying, and reasonably arrange the distance from the next elbow so as to reduce the resistance at the space elbow. The resistance of the groove is equivalent to that of the section shrink and swell reducing pipe, so that a chamfer or a round angle can be added at the swell opening or the swell opening, and the streamline can be slowly transited.
Fig. 8a and 8b are perspective views of the inlet of the dust remover of the wind and smoke system of the power plant and the inlet flue of the dust remover after modification. Each channel in the original flue is provided with three elbows, but the spacing arrangement of the elbows is unreasonable, so that the total resistance is larger, and on the other hand, the turning angle of the third elbow in the channel with the shortest length is smaller and can be ignored, so that the resistance difference of the three channels is larger, the flow distribution is uneven, and the operation of the dust remover is not facilitated. And each channel of the modified flue is provided with only two elbows, and the turning angle of each elbow is different by 30 degrees, so that the resistance of the flue is reduced, and the flow distribution of the dust removal inlet is uniform. Meanwhile, the optimized flue length is smaller than the original channel length and is 2/3 of the original length, so that steel can be saved, and investment cost is reduced.
Fig. 9a and 9b are graphs of flue velocity vectors of the inlet of the power plant dust collector and the inlet of the modified dust collector, and it can be seen that the flow states of the channels of the optimized flue are similar, so that the resistance and the flow distribution are uniform. The flow turns are relatively gentle, so that the flushing effect on the pipeline is relatively small.
Fig. 10a and 10b show the original scheme and the modification optimization scheme of the pipeline from the outlet of the dust remover to the inlet of the induced draft fan. The scheme is mainly characterized in that the original scheme is modified from the following aspects, firstly, the combination of the original scheme is changed into the combination of the vertical turning, and then the vertical turning is changed into the combination of the vertical turning, so that the collision of fluid is avoided; secondly, changing the rectangular tube in the original scheme into a circular tube; and finally, carrying out space optimization transformation on the space elbow formed by continuous turning. Through calculation, the resistance of the modified flue can be greatly reduced, and the resistances are respectively reduced by 139.8Pa and 160.1Pa, which is very beneficial to the economic operation of the dust remover, and meanwhile, the optimized flow is stable and uniform, so that the abrasion to the flue is reduced.
Claims (1)
1. An optimization method for connection mode and space arrangement of a fan and smoke system of a power plant is characterized by comprising the following steps of: the optimization of the flue of the cold primary air system of the air and smoke system of the electric plant comprises four modes, wherein in the scheme A, a square pipe is transformed into a round pipe, space optimization is carried out at the same time, and three continuous elbows arranged in the original scheme are replaced by two bent pipes and a section of space inclined pipe; the scheme B is that under the condition of space permission, the positions of the fans are rearranged to reduce two elbows, and meanwhile, the turning angle of the elbow in front of the inlet of the air preheater is reduced, so that the resistance is reduced; the scheme C is that the conical diffusion pipe is changed into a tower-shaped diffusion pipe on the basis of the scheme B, so that the elbow of the inlet of the air conditioner is changed from a diffusion elbow into a common elbow; the scheme D is that the scheme B is changed into a round tube from a rectangular tube under the condition of unchanged area;
the optimization of the flue of the primary air system of the air and smoke system of the electric plant comprises that in order to reduce the use of one elbow, the scheme A replaces the original Z-shaped elbow with a 45-degree elbow, and in the scheme B, all rectangular pipes of the section are changed into circular pipes on the basis of the scheme A;
the optimization of the outlet of the air preheater of the air-smoke system of the electric plant to the inlet of the primary hot air main pipe in front of the furnace comprises the steps of firstly reducing the distance between the second elbow and the shrinkage pipe and simultaneously reducing the turning radius of the second elbow; secondly, reducing the distance between the space elbows to enable L/b=2-4, wherein L is the length of a transition section of the connection of the two elbows, and b is the diameter of the section of the pipeline; finally, the space obtained by optimization is utilized to reform the right-angle elbow and the sharp elbow into slow-turning elbows and adjust the distance between the right-angle elbow and the sharp-turning elbows;
the optimization of the flue of the hot secondary air system of the air and smoke system of the electric plant comprises the steps of changing a contracted right-angle elbow into a contracted corner-cut elbow or a slow turning head by transformation, and optimizing the distance between the arrangement and the next elbow, wherein L/b=3.5, so that the resistance of the section is reduced; the resistance of the groove is equivalent to that of the section shrink and shrink reducing pipe, so that a chamfer or a round angle is added at the shrink opening or the shrink opening, and the streamline can be slowly transited;
the optimization for the outlet of the flue air preheater to the inlet of the dust remover of the power plant comprises the following aspects: each channel of the flue is provided with only two elbows, the turning angles of the elbows are the same and are 30 degrees, meanwhile, the length of the flue is shortened, and the total length is changed into 2/3 of the original total length;
the improvement optimization of the dust remover outlet to the induced draft fan inlet of the fan system of the power plant comprises the following aspects:
firstly, the combination of the original pipelines is changed into the first turning and then the combination, so that the collision of fluid is avoided; secondly, changing a rectangular pipe in the original pipeline into a circular pipe; and finally, carrying out space optimization transformation on a space elbow formed by continuous turning, wherein the included angle of the converging section of the two flues is changed from the original relative arrangement to 60 degrees, and the angle between the inlet section of the flue and the converging section is changed from the original 90 degrees to 135 degrees.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117910170A (en) * | 2024-03-19 | 2024-04-19 | 西安慧金科技有限公司 | Method and system for designing upper air duct of industrial furnace |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117910170A (en) * | 2024-03-19 | 2024-04-19 | 西安慧金科技有限公司 | Method and system for designing upper air duct of industrial furnace |
| CN117910170B (en) * | 2024-03-19 | 2024-06-11 | 西安慧金科技有限公司 | Method and system for designing upper air duct of industrial furnace |
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