CN110765590B - Internal threaded pipe for improving anti-scaling performance of valve and design optimization method - Google Patents
Internal threaded pipe for improving anti-scaling performance of valve and design optimization method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005457 optimization Methods 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 64
- 239000007787 solid Substances 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 31
- 239000012530 fluid Substances 0.000 claims abstract description 29
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 238000005728 strengthening Methods 0.000 claims abstract description 11
- 230000005514 two-phase flow Effects 0.000 claims description 21
- 230000001965 increasing effect Effects 0.000 claims description 14
- 230000005484 gravity Effects 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 9
- 230000003139 buffering effect Effects 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 239000012071 phase Substances 0.000 description 6
- 238000004088 simulation Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002455 scale inhibitor Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses an internal threaded pipe for improving the anti-scaling performance of a valve and a design optimization method. The internal threaded pipe is formed by an inlet reinforcing section and an outlet reinforcing sectionThe port buffer section and the normal flow section are different in length and shape; the length of the inlet strengthening section is 150mm, and the pitch ratio p12.02 of/D, groove depth ratio e10.07 is/D; the length of the outlet buffer section is 100mm, and the pitch ratio p32.43,/D, groove depth ratio e30.09/D; pitch ratio p of the normal flow section21.82, groove depth ratio e2and/D is 0.06. After the solid-liquid mixed phase passes through the internal thread pipe, most solid particles are thrown to the pipe wall of the internal thread pipe under the action of centrifugal force, and fluid continuously flows into the valve, so that the dirt resistance of the valve is improved.
Description
Technical Field
The invention relates to the field of valves, in particular to a device capable of improving the anti-fouling performance of a coal chemical industry valve.
Background
The valve is a pipeline accessory with the functions of determining the opening and closing of a pipeline, controlling the flow direction of fluid, adjusting the parameters of circulating media and the like, and is installed in fluid conveying systems of various pipelines, equipment and the like. The valve can be used for various fluids such as air, water, steam, slurry, oil products, liquid metal and the like, a solid-liquid two-phase flowing medium is often used, and solid particles are doped in the using process, so that the surfaces of the valve clack and the valve seat are scraped to cause abrasion. Due to the fact that the temperature is increased, the solubility is reduced, precipitates can be separated out, solid particles are deposited inside the valve, scaling is caused, the flowing of fluid is affected, flowing resistance in the valve is improved, conveying energy consumption is increased, and the service life of the valve is shortened.
The scale is removed by chemical cleaning liquid, so that the cleaning effect is not easy to judge, and the waste of the cleaning liquid or the insufficient cleaning degree of the scale are easy to cause. The scale inhibitor is generally used in water, and cannot be applied to the transportation process of all fluids, such as mud or oil products.
Disclosure of Invention
Aiming at the scaling problem in the use process of the existing valve, the invention provides the internal threaded pipe for improving the scaling resistance of the valve, which is suitable for various fluid media containing solid particles, and has the advantages of simple operation and convenient replacement.
The invention adopts the following technical scheme:
an internal threaded pipe for improving the anti-scaling performance of a valve is characterized in that the internal threaded pipe (1) is arranged at the front end of an inlet of the valve (7), and solid-liquid two-phase flow enters the valve (7) after passing through the internal threaded pipe (1); the internal threaded pipe (1) consists of an inlet reinforcing section, an outlet buffering section and a normal flow section, and the three sections of pipelines respectively enable solid particles in solid-liquid two-phase flow to be deposited on the pipe wall of the internal threaded pipe as much as possible by adjusting the length, the pitch ratio and the groove depth ratio.
Preferably, the length of the inlet reinforcing section is 150mm, and the pitch ratio p12.02 of/D, groove depth ratio e1/D＝0.07。
Further, the length of the outlet buffer section is 100mm, and the pitch ratio p32.43,/D, groove depth ratio e3/D＝0.09。
Further, the pitch ratio p of the normal flow section21.82, groove depth ratio e2/D＝0.06。
Furthermore, the drift diameter DN of the valve (7) is 20mm, the outer diameter of the pipeline of the internal thread pipe (1) is 26.7mm, the wall thickness is 1mm, and the inner diameter D of the pipeline is 24.7 mm.
Preferably, the pipeline and the valve are connected by flanges, threads or clamps.
Another objective of the present invention is to provide a method for optimizing the design of structural parameters of the internally threaded tube, which comprises the following steps:
s1: determining the outer diameter of the pipeline of the internal threaded pipe (1) according to the nominal diameter of the valve (7);
s2: constructing a stress analysis model of solid particles, and determining respective specific structural parameters of three sections of pipelines in the internal threaded pipe (1) by combining the flow characteristics of different internal threaded pipe shapes;
wherein, the gravity borne by the solid particles in the solid-liquid two-phase flow is as follows:
dpis the particle diameter, m;
ρpis the particle density, kg/m3；
g is gravity acceleration, and is 9.80m/s2；
The fluid acting force on solid particles in the solid-liquid two-phase flow is as follows:
FD＝8dp 2τw 2 (2)
τwis wall shear stress, N/m2；
The centrifugal force applied to solid particles in the solid-liquid two-phase flow is as follows:
wherein v ismThe average speed of the solid-liquid two-phase flow;
s3: adjusting the pitch ratio and the groove depth ratio of the inlet reinforcing section according to the stress analysis model to enable the internal threaded pipe to be in the inlet reinforcing section, fully utilizing the inlet effect, increasing solid particles deposited on the pipe wall by increasing the pitch and the groove depth and simultaneously reinforcing the spiral motion of the fluid;
s4: according to the stress analysis model, adjusting the pitch ratio and the groove depth ratio of the outlet buffer section to enable the inner diameter D of the outlet part of the outlet buffer section to be equal to the inner diameter of a valve (7), and enabling the groove shape to tend to be gentle by reducing the groove depth, so that solid particles can be favorably lifted and deposited on the upper part of the inner pipe wall of the inlet strengthening section;
s5: and adjusting the pitch ratio and the groove depth ratio of the normal flow section according to the stress analysis model, and enhancing the spiral motion of the fluid by increasing the groove depth to ensure that more solid particles in the solid-liquid two-phase flow move to the bulge of the thread and stay in place, and the liquid continuously flows forwards.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) after the internal thread pipe is used for a period of time, when solid particles deposited in the pipe reach a certain degree, the internal thread pipe can be replaced at any time, the operation is simple, and substances harmful to the environment can not be generated;
(2) the internal thread pipe is suitable for various fluids including slurry and oil products, is not limited to water, and can reduce most solid particles from entering the valve body no matter what solid particles are, so that the abrasion of the valve is reduced, the scaling phenomenon in the valve is improved, and the service life of the valve is prolonged.
(3) According to the diameters of different particles, the force of the solid particles can be changed by controlling the flow rate, so that the solid particles are thrown to the pipe wall under the action of centrifugal force and overcome the action of gravity and fluid, and compared with an internal thread pipe with a fixed pitch ratio (p/D is 1.82) and a fixed groove depth ratio (e/D is 0.06), the solid particles can be added by 28.57% and adhered to the pipe wall, and the anti-scaling capacity of the valve is improved.
Drawings
In order that the disclosure of the invention may be more readily understood, reference is now made to the following detailed description of the invention taken in conjunction with the accompanying drawings and examples, in which:
FIG. 1 is a schematic plan view of a user device according to the present invention;
FIG. 2 is a schematic view of an internally threaded tube according to the present invention;
in the figure: 1. an internally threaded tube; 2. a bolt; 3. a gasket; 4. a flange; 5. a seal ring; 6. a nut; 7. and (4) a valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in figure 1, the internal thread pipe for improving the anti-scaling performance of the valve in the invention is characterized in that the internal thread pipe (1) is arranged at the front end of an inlet of the valve (7), and solid-liquid two-phase flow enters the valve (7) after passing through the internal thread pipe (1). The internal thread pipe (1) is connected with the valve (7) through the flange (4), the flange (4) is fastened through the bolt (2), the gasket (3) and the nut (6), and waterproof sealing is carried out through the sealing ring (5). The internal threaded pipe (1) is designed in a three-section mode and consists of an inlet strengthening section, an outlet buffering section and a normal flowing section. The external diameter of the internally threaded tube 1 is determined by the nominal diameter of the valve 7. Different from the traditional internal threaded pipe with fixed pitch ratio and groove depth ratio, the three-section pipeline has different shapes (including pitch ratio and groove depth ratio) and lengths, and needs to deposit solid particles in solid-liquid two-phase flow on the wall of the internal threaded pipe as much as possible by respectively adjusting the lengths, the pitch ratio and the groove depth ratio.
The specific design optimization method of the structural parameters such as the shape, the length and the like in the internal thread pipe comprises the following steps:
(1) determining the outer diameter of the pipeline of the internal threaded pipe according to the nominal diameter of the valve;
(2) and (3) constructing a stress analysis model of the solid particles, analyzing the stress condition of the solid particles, determining specific structural parameters of each section by combining the flow characteristics of different internal threaded pipe shapes, depositing the solid particles in the solid-liquid two-phase flow on the pipe wall of the internal threaded pipe as much as possible so as to improve the anti-scaling capacity of the valve, and enabling the fluid to normally flow into the valve. In the stress analysis process, self gravity, fluid acting force and centrifugal force generated by spiral motion are mainly considered, the flow velocity is adjusted to ensure that the centrifugal force is greater than the resultant force of the gravity and the fluid acting force, and as many solid particles as possible are thrown to the wall surface.
Wherein, the gravity borne by the solid particles in the solid-liquid two-phase flow is as follows:
dpis the particle diameter, m;
ρpis the particle density, kg/m3；
g is gravity acceleration, and is 9.80m/s2。
The calculation formula of the fluid acting force on the solid particles in the solid-liquid two-phase flow is as follows:
FD＝8dp 2τw 2 (2)
τwis wall shear stress, N/m2；
The centrifugal force applied to solid particles in the solid-liquid two-phase flow is as follows:
wherein v ismIs the average velocity of the fluid and can be formulated
Calculating, m/s; average density
kg/m3；αkIs the volume fraction of the kth phase; rhokIs the density of the k-th phase, kg/m3，vkIs the velocity of the k phase, m/s. In the invention, for solid-liquid two-phase flow, only a solid phase and a liquid phase exist, so that the value of n is 2.
The stress analysis model can be used for simulating and optimizing the optimal structural parameters of each section, multiple groups of parameters can be set in the optimization process for simulation, and the optimal group is selected according to the expected effect.
(3) According to the stress analysis model, adjusting the pitch ratio and the groove depth ratio of the inlet strengthening section, and designing the inlet strengthening section of the internal thread pipe: considering the influence of the inlet effect, when the thickness of the boundary layer is smaller, the fluid acting force on the solid particles is smaller, the flow velocity is adjusted to ensure that the centrifugal force is larger than the resultant force of gravity and the fluid acting force, more particles are thrown to the pipe wall, meanwhile, the solid particles deposited on the pipe wall can be increased by increasing the screw pitch, and the spiral motion of the fluid can be enhanced by properly increasing the groove depth. Through multiple tests, the pitch ratio p is selected12.02 of/D, groove depth ratio e1The length of this segment is 150mm, where/D is 0.07. At this time, due to the existence of the inlet effect, the solid particles can be deposited as much as possible under the structural parameters, and the flow resistance in the section can be properly reduced by fully utilizing the inlet effect.
(4) According to the stress analysis model, adjusting the pitch ratio and the groove depth ratio of the outlet buffer section, and designing the outlet buffer section connected with the valve: the internal diameter D of the outlet part is equal to the internal diameter of the valve, and particles are easy to accumulate at the bottom of the internally threaded pipe due to the deep grooveThe particles are flushed into the valve and the groove depth needs to be reduced appropriately. Through multiple tests, the pitch ratio is defined as p32.43,/D, groove depth ratio e3The flute shape became gentle to facilitate the rising of the solid particles, and the length of this flute became 100mm, where D was 0.09.
(5) According to the stress analysis model, the pitch ratio and the groove depth ratio of the normal flow section are adjusted, and the normal flow section of the internal thread pipe is designed: the increase of the groove depth strengthens the spiral motion of the fluid, more solid particles in the solid-liquid mixed phase move to the convex part of the screw thread and stay in place, and the liquid continues to flow forwards. Through multiple tests, the pitch ratio is defined as p21.82,/D, groove depth ratio e2The length of the solid in this portion is determined by the length of the inlet strengthening section and the outlet buffer section, where/D is 0.06.
And (4) according to the determined structural parameters of each section of pipeline, producing and processing the corresponding internal threaded pipe pipeline.
The following description is given of the application and effects of the present invention by way of an example to facilitate better understanding of the nature thereof by those skilled in the art.
Example (b):
designing corresponding internal threaded pipe for valve with working pressure PN 1.6MPa, working temperature 20 deg.C and diameter DN 20mm by the above method, and designing corresponding internal threaded pipe with particle diameter dp＝5×10-5m, particle density ρp＝2600kg/m3The method comprises the following specific steps:
(1) when the drift diameter DN of the valve is 20mm, the outer diameter of the pipeline of the internal thread pipe is 26.7mm, the wall thickness is 1mm, and the inner diameter D of the pipeline is 24.7 mm;
(2) the stress condition of the solid particles is analyzed, the self gravity, the fluid acting force and the centrifugal force generated by the spiral motion are mainly considered, and the calculation formulas are respectively shown in the formulas (1) to (3).
(3) Designing an inlet strengthening section of the internal thread pipe, considering the influence of an inlet effect, simultaneously changing the shape of the thread to ensure that more solid particles can be deposited on the pipe wall, increasing the thread pitch to increase the solid particles deposited on the pipe wall, and properly increasing the groove depth to strengthen the spiral motion of the fluid, so that the final selection is carried outPitch ratio p of selected pitch12.02 of/D, groove depth ratio e10.07 for/D, i.e. pitch p1Is 50mm, the groove depth e11.75mm, the solid deposition rate of the section is higher than that of the other two sections, and in order to fully utilize the inlet effect, the length of the inlet strengthening section is determined to be 150 mm. Through simulation, the solid particle volume fraction in the part is 25.02%;
(4) designing an outlet buffer section connected with the valve, wherein the inner diameter D of an outlet part is equal to the inner diameter of the valve, particles are easy to accumulate at the bottom of an internal thread pipe due to too deep groove, and the particles are flushed into the valve under the action of fluid, so that the groove depth is properly reduced, and finally, the pitch ratio is set as p31.82, groove depth ratio e30.06 for/D, i.e. pitch p3Is 45mm, groove depth e3At 1.5mm, the flute shape becomes gentle, which facilitates the rising of solid particles, adheres more to the pipe wall, and the fluid continues to flow into the valve body, which is 100mm in length. Through simulation, the volume fraction of solid particles in the part is 22.35%, compared with other two sections, more particles are accumulated on the upper part of the outlet buffer section, and the solid particles can be prevented from being deposited on the lower part of the inner pipe wall and being flushed into the valve again.
(5) Designing the normal flow section of the internal thread pipe, and finally determining the pitch ratio as p22.43 for D, and e for depth ratio20.09/D, i.e. pitch p260mm, groove depth e22.25mm, the length of the section is determined by the lengths of the inlet strengthening section and the outlet buffering section, and the length of the section is 750mm when the whole length of the threaded pipe 1 is 1 m. The increase of the groove depth strengthens the spiral motion of the fluid, more solid particles in the solid-liquid mixed phase move to the convex part of the screw thread and stay in place, and the liquid continues to flow forwards. The volume fraction of solid particles in this fraction was 20.17% by simulation.
In order to further embody the anti-scaling capability of the invention relative to the traditional structure, a control group with fixed pitch ratio and groove depth ratio of the three-section pipeline is synchronously designed in the embodiment, in the control group, the length of the three-section pipeline is the same as that of the embodiment, but the pitch ratio is all fixed to be p/D equal to 1.82, and the groove depth ratio is all fixed to be e/D equal to 0.06. Simulation shows that the solid particles can be increased by 28.57% to be adhered to the tube wall of the internal threaded tube of the embodiment compared with a control group, and the anti-scaling capability of the valve is improved.
The above embodiments are merely specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Other attempts to implement different methods will be apparent to those skilled in the art based on the present disclosure. But variations or substitutions introduced by the present invention without inventive efforts are covered within the protection scope of the present invention.
Claims (6)
1. The structural parameter design optimization method of the internal threaded pipe for improving the anti-scaling performance of the valve is characterized by comprising the following steps of: the internal threaded pipe (1) is arranged at the front end of an inlet of the valve (7), and the solid-liquid two-phase flow enters the valve (7) after passing through the internal threaded pipe (1); the internal threaded pipe (1) consists of an inlet reinforcing section, an outlet buffering section and a normal flow section, and the three sections of pipelines respectively enable solid particles in solid-liquid two-phase flow to be deposited on the pipe wall of the internal threaded pipe as much as possible by adjusting the length, the pitch ratio and the groove depth ratio;
the method comprises the following steps:
s1: determining the outer diameter of the pipeline of the internal threaded pipe (1) according to the nominal diameter of the valve (7);
s2: constructing a stress analysis model of solid particles, and determining respective specific structural parameters of three sections of pipelines in the internal threaded pipe (1) by combining the flow characteristics of different internal threaded pipe shapes;
wherein, the gravity borne by the solid particles in the solid-liquid two-phase flow is as follows:
dpis the particle diameter, m;
ρpis the particle density, kg/m3；
g is gravity acceleration, and is 9.80m/s2；
The fluid acting force on solid particles in the solid-liquid two-phase flow is as follows:
FD＝8dp 2τw 2 (2)
τwis wall shear stress, N/m2；
The centrifugal force applied to solid particles in the solid-liquid two-phase flow is as follows:
wherein v ismThe average speed of the solid-liquid two-phase flow;
s3: adjusting the pitch ratio and the groove depth ratio of the inlet reinforcing section according to the stress analysis model to enable the internal threaded pipe to be in the inlet reinforcing section, fully utilizing the inlet effect, increasing solid particles deposited on the pipe wall by increasing the pitch and the groove depth and simultaneously reinforcing the spiral motion of the fluid;
s4: according to the stress analysis model, adjusting the pitch ratio and the groove depth ratio of the outlet buffer section to enable the inner diameter D of the outlet part of the outlet buffer section to be equal to the inner diameter of a valve (7), and enabling the groove shape to tend to be gentle by reducing the groove depth, so that solid particles can be favorably lifted and deposited on the upper part of the inner pipe wall of the inlet strengthening section;
s5: and adjusting the pitch ratio and the groove depth ratio of the normal flow section according to the stress analysis model, and enhancing the spiral motion of the fluid by increasing the groove depth to ensure that more solid particles in the solid-liquid two-phase flow move to the bulge of the thread and stay in place, and the liquid continuously flows forwards.
2. The structural parameter design optimization method of claim 1, wherein: the length of the inlet strengthening section is 150mm, and the pitch ratio p12.02 of/D, groove depth ratio e1/D＝0.07。
3. The structural parameter design optimization method of claim 2, wherein: length of outlet buffer sectionDegree of 100mm, pitch ratio p32.43,/D, groove depth ratio e3/D＝0.09。
4. The structural parameter design optimization method of claim 3, wherein: pitch ratio p of the normal flow section21.82, groove depth ratio e2/D＝0.06。
5. The structural parameter design optimization method of claim 1, wherein: the drift diameter DN of the valve (7) is 20mm, the outer diameter of the pipeline of the internal thread pipe (1) is 26.7mm, the wall thickness is 1mm, and the inner diameter D of the pipeline is 24.7 mm.
6. The structural parameter design optimization method of claim 1, wherein: the pipeline and the valve are connected by flanges, threads or hoops.
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| CN102564148A (en) * | 2012-02-29 | 2012-07-11 | 石家庄市新华工业炉有限公司 | Heat exchange system of sleeve kiln |
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