CN105627018A - Fluid damping device used for coping with pipeline pressure jump - Google Patents
Fluid damping device used for coping with pipeline pressure jump Download PDFInfo
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- CN105627018A CN105627018A CN201610116803.2A CN201610116803A CN105627018A CN 105627018 A CN105627018 A CN 105627018A CN 201610116803 A CN201610116803 A CN 201610116803A CN 105627018 A CN105627018 A CN 105627018A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
- F16L55/05—Buffers therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/043—Devices damping pulsations or vibrations in fluids specially adapted for protecting instruments from water hammer or vibrations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
- F16L55/055—Valves therefor
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Abstract
The invention discloses a fluid damping device used for coping with pipeline pressure jump. The fluid damping device comprises a box body. The box body is in a shape like a rotation body, wherein an ovoid curve rotates around the axis by a cycle to form the rotation body; and the two ends of the box body are coaxially provided with an outlet, an inlet and a connecting device for connecting an upstream gas pipeline with a downstream gas pipeline. Multiple groove pipes pointing to the outlet are evenly distributed on the inner wall, close to the outlet, of the box body in a spaced manner in a peripheral direction. The radian of the groove pipes is consistent with that of the inner wall of the box body. A plastic ball is smooth in surface and is movably placed in an inner cavity of the box body. The diameter of the plastic ball is larger than the diameter of the upstream gas pipeline and the diameter of the downstream gas pipeline. By changing the circulation area and the local resistance coefficient, the response time of downstream pressure jump is prolonged, the purpose that pressure is adjusted slowly is achieved, the structure and the principle are simple and clear, the fluid damping device is easy to mount and maintain, sensitive to response and fast in adjustment, the influence of upstream pressure jump on downstream pipeline instruments and equipment is relieved, the operating cost of enterprises is lowered, and safe and stable operation of the pipelines is guaranteed.
Description
Technical field
The present invention relates to a kind of fluid damping system, it is specifically related to a kind of fluid damping system tackling pipeline pressure sudden change.
Background technology
At present, gas transports mainly through pipe network system, and during gas utilization, the Sweet natural gas of upstream is transported to gas or large-scale user by pipe network. The emergency case occurred in air feed and gas transmission process due to Sweet natural gas or the upstream such as equipment such as valve, voltate regulator causes the fluctuation of pipe natural gas pressure when regulating or damage, cause the sudden change of flow velocity further, this kind of instantaneous change causes certain impact to equipment, instrument surface, produce vibrations simultaneously, the normal use of equipment, instrument can be affected time serious, threaten the safe operation of gas pipeline, so pressure and sudden change of flow speed should be avoided before important upstream device, instrument, postpone the mutation time of pressure and flow velocity.
The normal situation adopting damping system to slow down this kind of pressure jump in engineering, damping system is the relevant type damping system of a kind of speed without rigidity, comprises densify fluid damping system, magnetorheological fluid damp device, magneto-rheological grease damping system etc. Damping refer to the relative movement hindering object and motion Conversion of energy be heat energy or other can a kind of effect of dissipation energy. In mechanical-physical, the reduction damping vibration of the energy of system is not all because resistance causes, and with regard to mechanical vibration, one is because of friction resistance heat-dissipating, the mechanical energy of system is reduced, is converted into interior energy, and this kind of damping is frictional damping; Another kind is the vibrations that system causes particle around, the energy of system is radiate to surrounding gradually, turns into the energy of ripple, and this kind of damping is radiation damping. Chinese invention patent CN102562929A relates to a kind of Leak-free rotary fluid damping system, utilize the blades turning in Magnetic force tracting damping system, upon rotation of the blade, damping fluid flows through the little round tube hole on blade, consume energy when damping fluid flows through the little round tube hole on blade, play the effect of control vibration. Chinese invention patent CN104632989A provides a kind of high performance fluids damping isolator, add the use of rigidity bar, it is to increase the bending stiffness of vibration isolation, it is to increase the performance and application scope of vibration isolator. Chinese invention patent CN104776151A relates to the device for preventing leakage of a kind of fluid damping system, this patent viscoelastic material replaces conventional hermetic circle, viscoelastic material is consolidated by sulfidizing and piston rod and steel cylinder inwall, utilize viscoelastic material shearing strain effect big, tensile strength and tearing toughness height, ageing resistance is good, and the feature such as sulfuration consolidation ability is strong, makes up the deficiency of conventional seals circle.
Current Gas Industry there is no the damping system for hydrodynamicpressure and velocity jump, although above-mentioned damping system can reach requirement on regulating effect, but the structure of device is comparatively complicated, device fabrication cost is higher, installing with maintenance difficulties big, damping fluid is revealed and will pipe safety and smooth running be threatened simultaneously. So for the characteristic of natural gas line flowing, needing the principle with reference to damping system in engineering, studying the new Novel damping device being applicable to pipe natural gas.
Summary of the invention
It is an object of the invention to overcome prior art Problems existing, there is provided a kind of anti-leak performance good, adjustment speed is fast, less energy-consumption, easily manufacture, the pipeline fluid damping system easily safeguarded, the change of quick and sensitive adjustment upstream line pressure, on the impact of upstream device, ensures the normal operation of upstream device.
The present invention realizes the technical scheme of above-mentioned purpose:
Tackle a fluid damping system for pipeline pressure sudden change, comprising:
Casing, its shape is the solid of revolution rotating about the axis by oval curve to become for a week, two ends coaxially are provided with entry and exit and the coupling device for connecting upstream and downstream gas pipeline, described casing is circumferentially intervally distributed with the groove pipe of the described outlet of some sensings near the inwall exported evenly, the radian of described groove pipe is consistent with the inwall of casing, described groove Guan Keyu casing is one-body molded, it is also possible to be directly welded on the inwall of casing;
Baton round, smooth surface, activity is positioned in the inner chamber of casing and diameter is greater than upstream and downstream gas pipeline diameter.
The change of the upstream fluid flow state of this scheme causes the change of baton round kinestate, and then cause fluid to be changed by the circulation area of damping system, alter leads to the pressure in downstream, increases the reaction times of pressure jump, to realize the object that pressure slowly regulates.
Further, described coupling device comprises the upstream connecting thread of connect box entrance and the downstream connecting thread of connect box outlet, is applicable to the natural gas line that connection diameter is less.
Further, described coupling device comprises the upstream joint flange of connect box entrance and the downstream joint flange of connect box outlet, is applicable to the natural gas line that connection diameter is bigger.
Further, the form of the alkali-free alumina silicate glass material that the top curve surface place of described casing is provided with the kinestate for observing baton round and position, thus judge upstream fluid kinestate, convenient observation, there is heat-resistant stability and physical strength height simultaneously, the impact of general pipeline impurity can be resisted, thermal expansivity is low, softening temperature height, the advantages such as stable chemical performance.
Further, the curved surface place, bottom of described casing is provided with wash water valve, and described wash water valve can be small ball valve, and volume is little, and structure is simple, favorable sealing property, present position at casing lowest part, for regular discharge tube pollutent.
Further, Sweet natural gas consistent in density when the density of described baton round and pressure-stabilisation, so, when gas pressure is in steady state, the kinestate of baton round is also in steady state, i.e. stationary state, baton round is in stress balance, and baton round is subject to buoyancy will float on the middle position of cabinets cavity, even if when pressure has fluctuation and moves, also can move as far as possible between two parties, it is achieved Flow Resistant Coefficient slowly changes.
Further, described baton round is the hollow ball adopting POM plastic, the natural gas fluid that pressure is consistent with upstream line gas pressure design pressure it is filled with in ball, POM plastic has the characteristic of high rigidity, high rigidity, high abrasion, make it and Sweet natural gas consistent in density during pressure-stabilisation by arranging density that is hollow and the conveniently adjusted baton round of filled natural air-flow body, and difficult deformation.
Further, described casing and groove pipe are 304 stainless steels, and it has good solidity to corrosion, thermotolerance, low temperature intensity and mechanical characteristics, and punching press, the hot workability such as bending are good, it is easy to being processed into the casing with radian and certain bending face, corrosion-resistant intensity is also high.
Further, the diameter of described baton round is 1.2��1.5 times of natural gas line caliber.
Further, the height of described groove pipe is the 1/10��1/6 of natural gas line caliber, groove tube-surface grinder buffing, roughness is by polishing intensity and the degree of depth is determined, according to the radian of the coefficient of partial resistance that the requirement design roughness of actual pipeline operating mode, the roughness of groove pipe and fluid passage section size (radian and height) common decision fluid pass through and highly also can will affect the coefficient of partial resistance of damping system.
The present invention compared with prior art has following useful effect:
1, structure is simple, is easy to safeguard; This fluid damping system only by form, wash water valve, casing, baton round and groove pipe totally 5 parts form, manufacturing processed is simple, and material easily obtains, and it is convenient to fill unloading process. In use pipeline internal contamination thing is got rid of in time by sewage draining exit, and in spheroid, kinestate and position are fed back in time by form, can judge the kinestate of pipeline inner fluid further.
2, regulate rapidly, highly sensitive; Baton round is in stationary state when upstream fluid steady flow, and the coefficient of partial resistance that now fluid passes through is very little, can ignore; When upstream fluid pressure is undergone mutation, motion forward or backward will be there is rapidly in baton round according to the imbalance by power, owing to the difference of baton round kinestate and position determines the difference of fluid by this damping system coefficient of partial resistance, the pressure of downstream fluid is caused slowly to change, after about 3��5S, baton round returns to equilibrium state again, now upstream and fluid pressure downstream are substantially convergent, effectively slow down upstream pressure change to the impact in downstream, while not increasing foreign electron equipment, realize the automatic adjustment of pressure in pipeline.
3, turndown ratio is big, security and stability height; The principle of the invention is simple, damping system size can be designed according to requirement of actual working condition, effectively carry out adjustment process for each operating mode, do not introduce other tramp materiaies, seal degree height, can ensure unicity and the steady flow of pipeline fluid, and the baton round in damping system can serve as the effect of vacuum breaker simultaneously, effective anti-fluid refluxes, and ensures the safety of conduit running.
Accompanying drawing explanation
Fig. 1 is a kind of fluid damping system structural representation tackling pipeline pressure sudden change of the embodiment of the present invention.
Fig. 2 be natural gas upstream when being in steady flow condition baton round by power analysis and fluid flow state schematic diagram.
Baton round kinestate schematic diagram when Fig. 3 is natural gas upstream pressure jump.
Fig. 4 be natural gas upstream pressure jump too much time baton round kinestate schematic diagram.
Fig. 5 baton round kinestate schematic diagram when to be that natural gas upstream pressure is prominent subtract.
Fig. 6 baton round kinestate schematic diagram when to be that natural gas upstream pressure is prominent subtract too much.
Fig. 7 is a kind of fluid damping system size marking schematic diagram tackling pipeline pressure sudden change.
Fig. 8 be in Fig. 7 A-A to section size marking schematic diagram.
Shown in figure it is: 1-upstream joint flange; 2-form; 3-wash water valve; 4-casing; 5-baton round; 6-groove pipe; 7-downstream joint flange.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with accompanying drawing, the technical scheme of the present invention is carried out clear, complete description, but embodiments of the present invention are not limited to this.
As shown in Figure 1, a kind of fluid damping system tackling pipeline pressure sudden change, comprise form 2, wash water valve 3, casing 4, baton round 5, groove pipe 6, the shape of casing 4 is the solid of revolution rotating about the axis by oval curve to become for a week, two ends coaxially are provided with out, entrance and for connect, the upstream joint flange 1 of downstream gas pipeline and downstream joint flange 7, described casing 4 is circumferentially intervally distributed with the groove pipe 6 of the described outlet of some sensings near the inwall exported evenly, the radian of described groove pipe 6 is consistent with the inwall of casing 4, described groove pipe 6 can be one-body molded with casing 4, can also directly be welded on the inwall of casing 4, baton round 5 smooth surface, activity is positioned in the inner chamber of casing 4 and diameter is greater than upstream and downstream gas pipeline diameter.
Described upstream joint flange 1 and downstream joint flange 7 will connect the pipeline of upstream and downstream, it may also be useful to time is selected to be threaded or Flange joint according to the situation of actual condition, when designed gas pipeline caliber is less, pressure is lower, generally with being threaded. When caliber is relatively big, pressure is higher often with Flange joint, generally select slip on flange. Casing 4 two ends and upstream and downstream pipeline are respectively provided with the first sealing-ring and the 2nd sealing-ring that two possess sealing effect, to prevent damping system gas leakage. Simultaneously being provided with thrust-augmenting nozzle in closed cavity in the middle of two sealing-rings, thrust-augmenting nozzle can be connected with inert fluid gas cylinder, for blowing the impurity inside cleaning toward damping system.
Described form 2 is arranged on the top curve surface place of described casing 4, adopting alkali-free alumina silicate glass, thickness is 12mm, and withstand voltage scope is between 1��30MPa, its position can the motion conditions of baton round 5 in gross examination of skeletal muscle damping system, and then judge the pressure changing of upstream gas fast.
Described wash water valve 3 is arranged on the curved surface place, bottom of described casing 4, can regularly get rid of the pollutent in damping system, ensures that groove tube-surface roughness is constant.
Described casing 4 material is 304 stainless steels, and internal surface is smooth, and the height of casing and radian will affect the coefficient of partial resistance of flow of fluid damping system, can design casing specification according to pipeline actual condition.
Described baton round 5 is the hollow ball adopting POM plastic, the natural gas fluid that pressure is consistent with upstream line gas pressure design pressure it is filled with in ball, Sweet natural gas consistent in density when density and pressure-stabilisation, the diameter of baton round 5 is 1.2��1.5 times of natural gas line caliber, smooth surface, so fluid and baton round 5 almost do not have the effect of frictional force, i.e. no pressure loss. The front and back motion of baton round 5 will determine that gas is by the flow area size of damping system, and when upstream fluid steady flow, baton round is subject to fluid buoyancy and floats in the air, and will be in stationary state due to stress balance, as shown in Figure 2; When baton round moves forward, time namely toward downstream movement, as shown in Figure 3, actual internal area diminishes, and droop loss will strengthen; If upstream pressure change is too fast, the exit of damping system is arrived in top by baton round, and as shown in Figure 4, now the coefficient of partial resistance of fluid is maximum. When upstream fluid pressure diminishes suddenly, baton round will move backward, as shown in Figure 5. Downstream fluid will be caused to reflux when upstream fluid pressure is too low, owing to baton round 5 diameter ratio pipe diameter is big, so now baton round can be stuck in damping system ingress, as shown in Figure 6, now baton round serves as the effect of vacuum breaker, ensures the safety of upstream line equipment and the safe gas of other pipelines.
Described groove pipe 6 material is 304 stainless steels, its surfaceness determines the pressure-losses of fluid by damping system, roughness is determined by the intensity polished and the degree of depth, can according to the requirement design roughness of actual pipeline operating mode, and then alter is by the coefficient of partial resistance of damping system, the simultaneously radian of groove pipe and highly also will affect the coefficient of partial resistance of damping system, the more big then resistance coefficient of radian is more big, and groove pipe height is designed between the 1/10��1/6 of natural gas line caliber.
The present embodiment on the sudden change of current natural gas line upstream pressure on the impact of upstream device, device and safe gas, the device of a design fluid damping, can tackling upstream pressure sudden change fast to the impact in downstream, extend the pressure change time, its concrete principle of work and process are as follows:
Changing condition according to gas pressure, it is possible to be divided into steady state, pressure jump state, pressure to dash forward hydrodynamicpressure state and subtract state.
(1) steady state
When natural gas upstream pressure is in steady state, the kinestate of baton round 5 is also in steady state, i.e. stationary state, and baton round 5 is in stress balance. baton round 5 is subject to buoyancy and will float in the air, and due to baton round 5 lighter weight, on vertical direction, gravity and buoyancy can cancel each other, and this device mainly considers horizontal reactive force. owing to the existence of baton round 5 causes flow of fluid area to change, the area that circulates during fluid flow baton round 5 end reduces suddenly, and the area that circulates after flowing through baton round 5 expands suddenly, fluid local is made to do pressure vortex flow, form local eddy currents, under the effect of groove pipe 6, this eddy current can increase intensity further, eddy current is respectively having a vortical force up and down, this vortical force opposite direction acts on baton round 5, cumulative with the static pressure of downstream fluid thus with upstream fluid thrust is cancelled out each other, so there is a stress balance state when upstream fluid flow is in stable condition, namely now baton round 5 is in stationary state, as shown in Figure 2.
Known when fluid flows through solid wall surface, except the skim that viscous effects near wall face is serious, the flowing in all the other regions can be considered the vortex free motion of perfect fluid, i.e. circulation district, and Chu Zeshi vortex core district occurs vortex.
Being assumed to be permanent flow state, the pressure distribution that can obtain circulation district fluid with Lagrange integration is:
Utilize Euler's differential equation of motion can obtain the pressure distribution of vortex cavity fluid:
Illustrate vertical thick line section corresponding be the pressure values of P2.
(2) pressure jump state
When natural gas upstream pressure increases suddenly, the original equilibrium state of baton round 5 will be broken, under upstream fluid thrust, moment moves forward, as shown in Figure 3, fluid will be moved forward along with baton round 5 and progressively increase by the coefficient of partial resistance of damping system, and then causing droop loss to increase, downstream charge amplitude will be more much smaller than upstream plenum amplitude, to realize the effect slowly regulating fluid pressure downstream. If but mutational range has exceeded design scope, then baton round is by immediate roof to damping system lower exit, and as shown in Figure 4, coefficient of partial resistance is certain, i.e. pressure drop effect is determined, so damping system regulating effect is by not obvious. Now due to groove pipe Disjunct distribution in casing, as shown in Figure 7, so upstream fluid still flows into downstream line by groove ligament, what meet downstream line uses gas requirement, and gap circulation area is determined by ��. Baton round moves forward after for some time, due to the effect of vortical force and the static pressure of downstream fluid, baton round 5 will move gradually backward, Flow Resistant Coefficient slowly diminishes in this process, cause downstream pressure slowly close to upstream pressure, final baton round 5 will return to a steady state again, and upstream pressure is approximate equals fluid pressure downstream. For the damping system that designs, when different mutation pressure finally reaches stable, voltage drop value can difference to some extent.
(3) pressure is prominent subtracts state
When natural gas upstream pressure reduces suddenly, the original equilibrium state of baton round 5 also will be broken, for the inverse process that pressure increases suddenly, move under upstream fluid thrust backward, as shown in Figure 5, fluid will be moved forward along with baton round 5 and progressively increase little by the coefficient of partial resistance of damping system, and then cause droop loss to reduce, now baton round 5 will reach new stress balance. If but sudden change value has exceeded design scope, then baton round 5 is by immediate roof to damping system upstream inlet, and as shown in Figure 6, now damping system is equivalent to the effect of vacuum breaker, prevents downstream fluid from flowing backwards, and ensures the safety of upstream line equipment and air feed.
Below in conjunction with concrete example, the working process of a kind of fluid damping system tackling pipeline pressure sudden change is further described: during certain voltage regulating station stable state, gas pressure P1 is 4.0bar, mass rate is about 1000kg/h, gas flow rate V1 is about 15m/s, pipe diameter D1 is 80mm, in pipeline, quality of natural gas flow is certain, but gaseous tension and flow velocity exist change. It is 190mm according to this operating condition design damping system raising middle flask body length L, baton round diameter D2 is 100mm, in baton round 5, pressure is consistent with during pipeline stable state, the maximum caliber of damping system (D2+2R) is 160mm, groove pipe is divided into 8 pieces and is evenly arranged on the surface of cabinet wall, �� angle is 22.5 ��, and highly ((d1-d2)/2) are 10mm, and radian is about �� and is=20 ��.
1, baton round 5 kinestate and gas drag losses analysis when natural gas upstream is in steady flow condition
When natural gas upstream pressure is in steady state, namely when pressure P 1 is 4.0bar, the kinestate of baton round 5 is also in steady state, baton round 5 is subject to buoyancy and will float in the air, and gravity and buoyancy can cancel each other at vertical direction, and the present invention mainly considers transverse movement, vortical force and the pressure in circulation district, downstream hydrostatic pressures power P3 suffered by baton round 5 will offset upstream gas to the thrust of baton round, now baton round 5 is in stress balance, i.e. stationary state, as shown in Figure 2.
During balance by power analysis it is:
P1S1+P1cos45 �� of S2=P3S3+ (P ring cos45 �� of+P revolves) S ring
By
Substitution condition can solve now that baton round 5 center is in the 155mm place of damping system cross section diameter, and namely when upstream line gaseous tension is in steady state, it is the position at 155mm place at vertical red cross section diameter that baton round 5 stops.
Mach number is a non-dimensional parameter characterizing flow field compressibility size, is the important basic physical parameters of in high-speed air kinetics, and the similarity criterion of reflection flow field compressibility size, is often used to divide the type of flow of fluid:
By V=15m/s, Sweet natural gas coefficient of heat insulation k=1.31, R=287.1J/kg K, T=288.15K, then
M=0.046 < 0.5
So pipe natural gas is incompressible fluid in the design.
Then can obtain according to fluid continuity equation and Bernoulli equation:
(1) process of P1 to P2, is subject to the local resistance of ducting
V1A1=V2A2
W is the combustion gas V-bar of pipeline section, is similar to and can be taken as V1
�� 1 is the summation of coefficient of partial resistance in run of designing, now copies square elbow coefficient of partial resistance value to be 1.1 according to gas pipeline design specifications.
(2) process of P2 to P3, is subject to the local resistance of ducting
V2A2=V3A3
W is the combustion gas V-bar of pipeline section, is similar to and can be taken as V2
�� 2 is the summation of coefficient of partial resistance in run of designing, now copies stopping valve coefficient of partial resistance value to be 11.0 according to gas pipeline design specifications.
Substitute into above-mentioned condition to calculate:
The maximum cross section of baton round 5 is in damping system interior diameter when being 150mm, it is achieved that stress balance, now:
V1=15.0m/sP1=4.0bar,
V2=8.63m/sP2=3.99bar,
V3=15.0m/sP3=3.98bar,
Namely when Sweet natural gas is in stable state, Sweet natural gas is 0.02bar through the pressure drop of this damping system, is similar to and ignores.
2, during natural gas upstream pressure jump, baton round 5 kinestate and gas drag losses are analyzed
When hydrodynamicpressure increases suddenly, owing to mass rate and pipe diameter are constant, so flow velocity will reduce. Assume that now hydrodynamicpressure P1 increases to suddenly 6bar, now corresponding V1=11.14m/s, stress balance when baton round 5 body is in stable state will be broken, baton round 5 is promoted by Sweet natural gas and moves forward, as shown in Figure 3, make the circulation area of gas stream overdamping device more and more less, the more big i.e. pressure drop now of corresponding fluid resistance is more big, in time can be calculated that to be in damping system cross section diameter to baton round center before now baton round 5 will be pushed away at most be 120mm, namely the cross section diameter at vertical thick line place is 120mm.
Owing to this process is dynamic changing process, three some static point when desirable baton round moves forward are as computation model, simulate dynamic process by multiple static point, when the cross section diameter getting vertical thick line place is 130mm, 125mm and 120mm, calculate the force value of now corresponding gas downstream.
When the cross section diameter at vertical thick line place is 130mm,
Then can obtain by equation of continuity and Bernoulli equation:
(1) process of P1 to P2, is subject to the local resistance of ducting
V1A1=V2A2
W is the combustion gas V-bar of pipeline section, is similar to and can be taken as V1
�� 1 is the summation of coefficient of partial resistance in run of designing, and now gas is subject to square elbow and the shock resistance of groove pipe, then copy square elbow and stopping valve coefficient of partial resistance value to be 3.0 according to gas pipeline design specifications;
(2) process of P2 to P3, is subject to the local resistance of ducting
V2A2=V3A3
W is the combustion gas V-bar of pipeline section, is similar to and can be taken as V2
�� 2 is the summation of coefficient of partial resistance in run of designing, now copies stopping valve coefficient of partial resistance value to be 25.0 according to gas pipeline design specifications
Substitute into above-mentioned condition to calculate:
V1=11.14m/sP1=6.0bar,
V2=15.85m/sP2=5.98bar,
V3=11.14m/sP3=5.84bar,
Namely when Sweet natural gas is in load condition, Sweet natural gas is 0.16bar through the pressure drop of this damping system, and regulation ratio of damping is f=P1/P3 �� 10=10.27.
Table 1 can be obtained with reason
It will be seen that move forward along with baton round 5, more greatly namely pressure drop is more big through the resistance of damping system for natural gas flow, and the ratio of damping of gained is also more big. Afterwards due to the effect of vortical force and the static pressure of downstream fluid, baton round will move gradually backward, again reaches stress balance state, thus completes the whole process delaying disturbances, and slack time is long about 4S when fluid simulation can be calculated.
3, when natural gas upstream pressure jump is too fast, baton round kinestate and gas drag losses are analyzed
When natural gas upstream pressure increase is excessive, baton round under upstream gas thrust by the lower exit place of immediate roof at damping system, as shown in Figure 4, the resistance being now subject to during Sweet natural gas circulation damping system is maximum, i.e. pressure drop effect is the most obvious, �� 1 and �� 2 respectively value be 11.0 and 35.0, corresponding thick line vertical cross section diameter is 115mm. Assuming that now hydrodynamicpressure P1 increases to 7.0bar, now corresponding V1=9.74m/s, then can be obtained by equation of continuity and Bernoulli equation:
V2=38.69m/sP2=5.93bar,
V3=9.74m/sP3=5.57bar,
Namely when Sweet natural gas is in load condition, Sweet natural gas is 1.43bar through the pressure drop of this damping system, and corresponding ratio of damping is f=P1/P3=12.57.
Now to delay the effect of upstream change in resistance the strongest for this damping system, afterwards due to the effect of vortical force and the static pressure of downstream fluid, baton round 5 will move gradually backward, Flow Resistant Coefficient slowly diminishes in this process, cause downstream pressure slowly close to upstream pressure, final baton round 5 will return to a steady state again, and upstream pressure is approximate equals fluid pressure downstream.
4, baton round 5 kinestate and gas drag losses analysis when subtracting that natural gas upstream pressure is prominent
When in stable state pipeline, gas pressure reduces suddenly in original place, the stress balance state of original baton round 5 will be broken, baton round 5 is by rearward movement, as shown in Figure 5, suffered by corresponding baton round 5, the resistance of damping system also will reduce, now baton round reaches a new stress balance again, slows down the speed that downstream gas pressure diminishes. This process is that the inverse process that above-mentioned upstream gas pressure is uprushed, regulating effect and time are close.
Subtract value exceeded design scope when pressure is prominent, then baton round 5 is by immediate roof to damping system upstream inlet, and as shown in Figure 6, now damping system is equivalent to the effect of vacuum breaker, prevents downstream fluid from flowing backwards, the safety of guarantee upstream line equipment and air feed. Can be calculated when pressure decreases beyond 1.0bar, the upstream inlet of damping system is arrived in top automatically by baton round 5.
In sum, the damping system of this kind of reply pipeline fluid pressure jump can be stablized and efficient operation in rational design pressure. When upstream line design pressure is 4.0bar, if upstream line gas pressure is when 3.0��6.0bar changes, by the round motion of baton round 5, it may be achieved slowly regulating the object of downstream gas pressure, regulating time is between 3��5S. When upstream pressure fluctuations is more than 6.0bar, owing to damping system length L is certain, so causing baton round 5 will withstand on lower exit place, pressure regulating effect is deteriorated, it could even be possible to make baton round 5 lose the ability coming and going motion. When upstream pressure fluctuations is lower than 3.0bar, downstream fluid will reflux, and baton round 5 withstands on the upstream inlet place of device, and now baton round 5 serves as the effect of pipe line check valve, ensures steady running and the air feed safety of upstream equipment.
The above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention. For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description. Here without the need to also cannot all enforcement modes be given exhaustive. All any amendment, equivalent replacement and improvement etc. done within the spirit and principles in the present invention, all should be included within the protection domain of the claims in the present invention.
Claims (10)
1. tackle the fluid damping system of pipeline pressure sudden change for one kind, it is characterised in that, comprising:
Casing (4), its shape is the solid of revolution rotating about the axis by oval curve to become for a week, two ends coaxially are provided with entry and exit and the coupling device for connecting upstream and downstream gas pipeline, described casing (4) is circumferentially intervally distributed with the groove pipe (6) of the described outlet of some sensings near the inwall exported evenly, and the radian of described groove pipe (6) is consistent with the inwall of casing (4);
Baton round (5), smooth surface, activity is positioned in the inner chamber of casing (4) and diameter is greater than upstream and downstream gas pipeline diameter.
2. the fluid damping system of reply pipeline pressure according to claim 1 sudden change, it is characterised in that: the downstream connecting thread that described coupling device comprises the upstream connecting thread of connect box (4) entrance and connect box (4) exports.
3. the fluid damping system of reply pipeline pressure according to claim 1 sudden change, it is characterised in that: the downstream joint flange that described coupling device comprises the upstream joint flange of connect box (4) entrance and connect box (4) exports.
4. the fluid damping system of reply pipeline pressure according to claim 1 sudden change, it is characterised in that: the top curve surface place of described casing (4) is provided with the kinestate for observing baton round and position, the form (2) of the alkali-free alumina silicate glass material that thus judges upstream fluid kinestate.
5. the fluid damping system of reply pipeline pressure according to claim 1 sudden change, it is characterised in that: the curved surface place, bottom of described casing (4) is provided with wash water valve (3).
6. the fluid damping system of reply pipeline pressure according to claim 1 sudden change, it is characterised in that: the Sweet natural gas consistent in density when density of described baton round (5) and pressure-stabilisation.
7. the fluid damping system of reply pipeline pressure according to claim 1 sudden change, it is characterized in that: described baton round (5) is the hollow ball adopting POM plastic, is filled with the natural gas fluid that pressure is consistent with upstream line gas pressure design pressure in ball.
8. the fluid damping system of reply pipeline pressure according to claim 1 sudden change, it is characterised in that: described casing (4) and groove pipe (6) are 304 stainless steels.
9. the fluid damping system of reply pipeline pressure according to claim 1 sudden change, it is characterised in that: the diameter of described baton round (5) is 1.2��1.5 times of natural gas line caliber.
10. the fluid damping system of reply pipeline pressure according to claim 1 sudden change, it is characterised in that: the height of described groove pipe (6) is the 1/10��1/6 of natural gas line caliber.
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| CN106523842A (en) * | 2016-12-01 | 2017-03-22 | 深圳市燃气集团股份有限公司 | New spring damping device for coping with pipeline pressure jump |
| CN106763957A (en) * | 2016-11-21 | 2017-05-31 | 肖蕾 | A kind of gas pipeline standpipe additional pressure head compensation device and its compensation method |
| CN108167649A (en) * | 2018-01-23 | 2018-06-15 | 深圳市燃气集团股份有限公司 | A kind of temperature and pressure balancing device applied to pressure energy of natural gas power generation process |
| CN108180343A (en) * | 2018-01-19 | 2018-06-19 | 华南理工大学 | A kind of fluid damping device of novel answering pressure mutation |
| CN108204245A (en) * | 2018-01-23 | 2018-06-26 | 深圳市燃气集团股份有限公司 | A kind of gas distributing system pressure recovery method and device |
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