CN217130427U - Gas-liquid dual-purpose safety valve device - Google Patents
Gas-liquid dual-purpose safety valve device Download PDFInfo
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- CN217130427U CN217130427U CN202220087522.XU CN202220087522U CN217130427U CN 217130427 U CN217130427 U CN 217130427U CN 202220087522 U CN202220087522 U CN 202220087522U CN 217130427 U CN217130427 U CN 217130427U
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Abstract
The application provides a gas-liquid dual-purpose safety valve device, which comprises a gas-liquid separator connected with an outlet of a safety valve pipeline of protected equipment, wherein the top of the gas-liquid separator is vertically connected with a gas vent pipe for discharging gas, and the bottom of the gas-liquid separator is vertically connected with a liquid vent pipe for discharging liquid; the gas-liquid separator is of a structure with two narrow ends and a wide middle, the side edge of the gas-liquid separator is provided with a vent pipe inlet, the top of the gas-liquid separator is provided with a gas outlet, the bottom of the gas-liquid separator is provided with a liquid outlet, and a floating ball is arranged inside the gas-liquid separator; the gas outlet is communicated with a gas vent pipe, the liquid outlet is communicated with a liquid vent pipe, and the vent pipe inlet is horizontally communicated with an outlet pipeline of a safety valve of protected equipment; the diameter of the floating ball is larger than the diameter of the gas outlet and the diameter of the liquid outlet. The utility model discloses not only can save unnecessary relief valve for the device, pipeline and pipe fitting have reduced the device cost, have still simplified pressure relief device's structure to the work load of field personnel operation and maintenance has been reduced.
Description
Technical Field
The utility model relates to the technical field of machinery, especially, relate to a dual-purpose relief valve device of gas-liquid.
Background
In the petrochemical industry, the safety valve has the advantages of simple structure, compact arrangement, higher sensitivity and safety, and is widely applied to the protection of equipment and pipelines. The safety valve needs to be released in time under various overpressure conditions to achieve the purpose of protecting equipment.
Sometimes, the safety valve may need to have both gas and liquid release functions. To ensure relief safety, gas and liquid need to be bled to different locations. This requires the designer to take full consideration of the bleed-off, and avoids the problems associated with bleeding gas into the liquid phase system or bleeding liquid into the gas phase system.
The method commonly adopted in the industry at present is to set two or more sets of safety valve systems specially used for discharging gas and liquid for the same equipment according to different discharge working conditions. The implementation method of the method is that different tripping pressures are set for different safety valves, different discharge working conditions of the device are distinguished, and it is ensured that a discharge medium enters a correct emptying system. This approach has several drawbacks 1. it adds unnecessary equipment, piping, and plumbing, increasing the cost of the device. 2. This increases the workload on field operators and maintenance personnel, as the safety valve requires periodic verification and maintenance. 3. Because different relief valves need to set different take-off pressures, the complexity of the device operation is further increased, and the space for pressure regulation is further reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the defect that above-mentioned prior art exists, provide a dual-purpose relief valve device of gas-liquid.
A gas-liquid dual-purpose safety valve device comprises a gas-liquid separator connected with an outlet of a safety valve pipeline of protected equipment, wherein the top of the gas-liquid separator is vertically connected with a gas vent pipe for discharging gas, and the bottom of the gas-liquid separator is vertically connected with a liquid vent pipe for discharging liquid;
the gas-liquid separator is of a structure with two narrow ends and a wide middle part, the top of the gas-liquid separator is provided with a gas outlet, the bottom of the gas-liquid separator is provided with a liquid outlet, the side of the gas-liquid separator is provided with a vent pipe inlet, and a floating ball is arranged inside the gas-liquid separator; the gas outlet is communicated with a gas vent pipe, the liquid outlet is communicated with a liquid vent pipe, and the vent pipe inlet is communicated with the pipeline outlet of a safety valve of protected equipment; the diameter of the floating ball is larger than that of the gas outlet and that of the liquid outlet.
Further, according to the gas-liquid dual-purpose safety valve device, the tail end of the liquid emptying pipe is horizontally connected with the horizontal liquid emptying pipe, and the tail end of the horizontal liquid emptying pipe is upwards and vertically connected with the vertical liquid emptying pipe;
setting the height of the gas vent pipe to be H1, the height of the vertical liquid vent pipe to be H2, and the stable pressure of the gas vent main pipe to be P1; the stable pressure of the liquid emptying header pipe is P2, the density of the liquid medium is rho, and then:
when P1 is more than P2, H1 is 1.5-2 m; h2> (P1-P2)/rho g +0.5 m;
h1> (P2-P1)/rho g +0.5m when P1 < P2; h2 is 1.5-2 m;
when P1+ delta P1 is P2+ delta P2, H1 is 1.5-2 m; h2 is 1.5-2 m.
Further, in the gas-liquid dual-purpose safety valve device, the floating ball can float in the discharged liquid; and does not corrode with the medium of the gas and liquid emptying header pipe; and has a certain mechanical strength.
Furthermore, in the gas-liquid dual-purpose safety valve device, two cut-off valves are sequentially connected between the outlet of the protected device and the gas-liquid separator, and a safety valve is connected between the two cut-off valves; a check valve is arranged between the first cut-off valve and the safety valve; two ends of the two cut-off valves are connected in parallel with a safety valve auxiliary line valve.
Further, in the above-described dual-purpose relief valve device for gas and liquid, | P1-P2| < ═ 0.08 Mpa.
Furthermore, in the gas-liquid dual-purpose safety valve device, two 45-degree joints are sequentially connected to the tail end of the gas vent pipe, the two joints have opposite angle positions, and a gas vent main pipe is horizontally connected to the tail end of the second 45-degree joint;
the tail end of the vertical liquid emptying pipe is sequentially connected with two 45-degree joints, the two joints are opposite in angle position, and the tail end of the second 45-degree joint is horizontally connected with a liquid emptying header pipe.
Further, according to the gas-liquid dual-purpose safety valve device, a pipeline sight glass and a liquid supplementing funnel for observing the liquid level height and supplementing the liquid seal are additionally arranged on the side of the vertical liquid emptying pipe.
Has the advantages that:
the utility model provides a dual-purpose relief valve device of gas-liquid has avoided setting up the condition of many sets of relief valves in order to ensure discharging of gas and liquid of discharging, through the bleeder of one set of relief valve, can release gas and liquid and get into different unloading systems. The design not only can save redundant safety valves, pipelines and pipe fittings for the device, reduce the manufacturing cost of the device, but also simplifies the structure of the pressure relief device and reduces the workload of the operation and maintenance of field personnel.
Drawings
FIG. 1 is a schematic structural view of a gas-liquid dual-purpose safety valve device of the present invention;
reference numerals:
1-a protected device; 2-safety valve; 3-a shut-off valve; 4-safety valve secondary line valve; 5-a check valve; 6-gas-liquid separator; 7-gas emptying header pipe; 8-liquid emptying header pipe; 61-inlet of emptying pipe; 62-gas outlet; 63-a liquid outlet; 64-floating ball.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In order to cope with the complex situation which may occur in the device in actual operation, the relief valve relief pipes of gas phase and liquid phase must be kept open at the same time and all the time during the operation of the device, so as to prevent the situation that the medium cannot be discharged due to the accidental relief of the relief valve. Therefore, it is necessary to ensure that the gas/liquid medium is discharged into the correct path by a reasonable design, taking the system pressure drop into full account. Meanwhile, the medium cross-connection of the open gas-phase system and the open liquid-phase system is ensured to be avoided when the device normally operates.
The application cannot be used for devices in which gas and liquid venting systems need to be absolutely isolated. In actual operation, there may be a very small amount of liquid entering the gas venting system, or a very small amount of gas entering the liquid venting system.
The application can not be used for the emptying system with the backpressure difference of the gas and liquid discharge system exceeding 0.08 MPa.
As shown in fig. 1, the gas vent manifold and the liquid vent manifold are typically two different pressure systems within the device, and therefore the back pressure of the relief valve is different. After passing through the safety valve, the medium (whether gas or liquid) will be discharged to the system with lower pressure.
The stable pressure of the gas discharge main pipe 7 is P1; the liquid discharge manifold 8 is stabilized at a pressure P2. The density of the liquid medium is ρ.
As shown in fig. 1, the present application provides a gas-liquid dual-purpose safety valve device, which comprises a gas-liquid separator 6 connected with an outlet of a safety valve pipeline of a protected device, wherein a gas vent pipe for discharging gas is vertically connected to the top of the gas-liquid separator 6, and a liquid vent pipe for discharging liquid is vertically connected to the bottom of the gas-liquid separator;
the gas-liquid separator 6 is of a structure with two narrow ends and a wide middle part, the top of the gas-liquid separator is provided with a gas outlet 62, the bottom of the gas-liquid separator is provided with a liquid outlet 63, the side of the gas-liquid separator is provided with a vent pipe inlet 61, and a floating ball 64 is arranged inside the gas-liquid separator; the gas outlet 62 is communicated with a gas vent pipe, the liquid outlet 63 is communicated with a liquid vent pipe, and the vent pipe inlet 61 is communicated with a safety valve pipeline outlet of protected equipment; the diameter of the float ball 64 is larger than the diameter of the gas outlet 62 and also larger than the diameter of the liquid outlet 63.
The tail end of the gas emptying pipe is sequentially connected with two 45-degree joints, the angle positions of the two joints are opposite, and the tail end of the second 45-degree joint is horizontally connected with a gas emptying header pipe 7;
the tail end of the liquid emptying pipe is horizontally connected with a horizontal liquid emptying pipe, the tail end of the horizontal liquid emptying pipe is vertically connected with a vertical liquid emptying pipe upwards, the tail end of the vertical liquid emptying pipe is sequentially connected with two 45-degree joints, the two joints are opposite in angle position, and the tail end of the second 45-degree joint is horizontally connected with a liquid emptying header pipe 8.
Two cut-off valves 3 are sequentially connected between the outlet of the protected equipment and the gas-liquid separator 6, and a safety valve 2 is connected between the two cut-off valves 3; a check valve 5 is arranged between the first cut-off valve 3 and the safety valve 2; two ends of the two shut-off valves 3 are connected in parallel with a safety valve auxiliary line valve 4.
The following table shows the installation requirements of the device in actual application
| Condition | H1 | H2 |
| When P1>P2 | 1.5～2m | >(P1-P2)/ρg+0.5m |
| When P1 < P2 | >(P2-P1)/ρg+0.5m | 1.5～2m |
| When P1+ delta P1 is equal to P2+ delta P2 | 1.5～2m | 1.5～2m |
The gas-liquid separator is of a structure with two narrow ends and a wide middle, and a floating ball with a diameter slightly larger than that of the upper and lower emptying pipes is placed in the gas-liquid separator. The floating ball material needs to satisfy the following conditions: 1. can float in the discharged liquid, 2, does not corrode with the media of the gas phase and liquid emptying header. 3. Has certain mechanical strength.
The gate valves at the front and the rear of the safety valve are cut-off valves of the safety valve, and the cut-off valves are firstly closed in the inspection and the overhaul of the safety valve, so that upstream and downstream gas is prevented from being mixed. And the check valves at the front and rear parts of the safety valve are used for checking whether gas remains in the pipeline after the front and rear cut-off valves are closed. The cut-off double-line valve is used for purging equipment and pipelines in the process of shutdown of a device or verification of a safety valve.
For economic and safety reasons, the present application recommends the use of systems in which | P1-P2| < ═ 0.08Mpa, and the gas venting and liquid venting systems are not in a strictly prohibited isolated state.
The device that this application provided is when the operation is steady, and the accident-free emergence, when the relief valve was in the closed condition, the floater among the vapour and liquid separator can drop in the hole of vapour and liquid separator bottom, keeps apart gas vent system and liquid vent system. The safety valve and the gas emptying system maintain a connection state, and the safety valve meets the installation requirement of the safety valve of the petrochemical device.
The application provides a device when the relief valve begins to release gas, gas can enter into gas-liquid separator and flow upward releases to gas unloading system.
The application provides a device is when the relief valve begins to discharge liquid, and liquid can enter gas-liquid separator to begin to gather the liquid level in the separator bottom, when the liquid level was high enough, the floater can float, and liquid can get into liquid emptying system through the liquid phase pipeline of gas-liquid separator bottom. If liquid volume of releasing is big enough, the liquid level in the vapour and liquid separator can rise, and the floater can rise along with the liquid level, finally plugs up the gas riser of releasing, prevents that liquid from getting into gaseous unloading system.
During the dynamic of the relief valve device that this application provided was released, the condition that liquid got into gaseous unloading riser can appear in the short term, and liquid this moment can form the liquid column that highly is H1 in the riser, can lead to gas discharge system backpressure to be higher than liquid discharge system, and liquid can fall back automatically gradually, gets into liquid discharge system through the pipeline of vapour and liquid separator bottom.
During the dynamic of the relief valve device that this application provided was released, the condition that can appear gas entering liquid unloading riser in the short term, liquid this moment can be blockked up by the liquid seal of height H2, and can not get into liquid emptying system.
The device that this application provided need fill liquid to liquid bag (vertical liquid blow-down pipe) before the operation to guarantee sealed effect, in order to guarantee the operation in-process liquid bag liquid exists always, can add in the liquid bag side and establish pipeline sight glass and fluid infusion funnel, observe the liquid level height and supply the liquid and seal.
The device that this application provided, during designer carried out the safety valve calculation need drop the resistance of the straight tube at gas-liquid top and the liquid bag of bottom and consider the safety valve backpressure.
The device that this application provided, 45 degrees elbows access evacuation is responsible for, and the medium that makes the medium of releasing and former pipeline has the same flow direction, has reduced the erosion, has reduced the pipeline stress of relief valve discharge in-process.
Example (b):
a storage tank V-101 with deionized water is placed on a platform with the height of more than 10m, the tank is isolated from the air by using nitrogen, and pressure control is carried out through a corresponding pressure control valve. The operating pressure of the tank was 0.15MPag and the design pressure was 0.35 MPag. In order to protect the pressure of the tank V-101, a safety valve PSV-001 is arranged, the constant pressure is 0.35MPag, and the safety valve has two discharge working conditions: 1. the pressure control system out of control working condition: the control system of the upstream nitrogen gas is out of control to cause overpressure in the tank. 2. And under the condition of outlet blockage, the deionized water outlet pipeline is blocked to cause overpressure. Because the medium in the tank does not belong to dangerous media, gas is discharged to the atmosphere (far away from personnel safety places), and liquid is discharged to the device pipe ditch.
The solution is as follows: according to the gas-liquid dual-purpose safety valve device provided by the application, a gas-liquid separator is arranged on an outlet pipeline of the safety valve. The top of the gas-liquid separator is provided with a section of straight pipe with the height of H1. The bottom of the gas-liquid separator is provided with a section of straight pipe and a section of liquid bag, the height of the liquid bag is H2, and then the liquid bag is introduced into a pipe ditch.
Since the pressure of the gas vent line and the liquid vent line are equal, P1 is P2. H1 ═ 2m, and H2 ═ 2 m.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. A gas-liquid dual-purpose safety valve device is characterized by comprising a gas-liquid separator (6) connected with an outlet of a safety valve pipeline of protected equipment, wherein the top of the gas-liquid separator (6) is vertically connected with a gas emptying pipe for discharging gas, and the bottom of the gas-liquid separator is vertically connected with a liquid emptying pipe for discharging liquid;
the gas-liquid separator (6) is of a structure with two narrow ends and a wide middle part, the top of the gas-liquid separator is provided with a gas outlet (62), the bottom of the gas-liquid separator is provided with a liquid outlet (63), the side of the gas-liquid separator is provided with a vent pipe inlet (61), and the inside of the gas-liquid separator is provided with a floating ball (64); the gas outlet (62) is communicated with a gas vent pipe, the liquid outlet (63) is communicated with a liquid vent pipe, and a vent pipe inlet (61) is communicated with a pipeline outlet of a safety valve of protected equipment; the diameter of the floating ball (64) is larger than that of the gas outlet (62) and that of the liquid outlet (63).
2. The dual-purpose safety valve device for gas and liquid as claimed in claim 1, wherein a horizontal liquid blow-down pipe is horizontally connected to the end of the liquid blow-down pipe, and a vertical liquid blow-down pipe is vertically connected to the end of the horizontal liquid blow-down pipe;
setting the height of the gas vent pipe to be H1, the height of the vertical liquid vent pipe to be H2, and the stable pressure of the gas vent header pipe (7) to be P1; the stable pressure of the liquid discharge main pipe (8) is P2, the density of the liquid medium is rho, and then:
when P1 is greater than P2, H1 is 1.5-2 m; h2> (P1-P2)/rho g +0.5 m;
h1> (P2-P1)/rho g +0.5m when P1 < P2; h2 is 1.5-2 m;
when P1+ delta P1 is P2+ delta P2, H1 is 1.5-2 m; h2 is 1.5-2 m.
3. The gas-liquid dual-purpose safety valve device according to claim 1, wherein the float ball (64) is capable of floating in a discharged liquid; and does not corrode with the medium of the gas and liquid emptying header pipe; but also has a certain mechanical strength.
4. The dual-purpose safety valve device for gas and liquid as claimed in claim 1, wherein two shut-off valves (3) are connected in sequence between the outlet of the protected equipment and the gas-liquid separator (6), and the safety valve (2) is connected between the two shut-off valves (3); a check valve (5) is arranged between the first shut-off valve (3) and the safety valve (2); two ends of the two cut-off valves (3) are connected in parallel with a safety valve auxiliary line valve (4).
5. The dual-purpose relief valve device of claim 2, wherein | P1-P2| < ═ 0.08 Mpa.
6. The dual-purpose safety valve device for gas and liquid as claimed in claim 2, wherein two 45 degree joints are connected in sequence at the end of the gas vent pipe, the two joints have opposite angle positions, and a gas vent header pipe (7) is horizontally connected at the end of the second 45 degree joint;
the tail end of the vertical liquid emptying pipe is sequentially connected with two 45-degree joints, the angle positions of the two joints are opposite, and the tail end of the second 45-degree joint is horizontally connected with a liquid emptying header pipe (8).
7. The dual-purpose safety valve device for gas and liquid as claimed in claim 2, wherein a pipeline sight glass and a liquid-replenishing funnel for observing liquid level and replenishing liquid seal are additionally arranged at the side of the vertical liquid emptying pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220087522.XU CN217130427U (en) | 2022-01-10 | 2022-01-10 | Gas-liquid dual-purpose safety valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220087522.XU CN217130427U (en) | 2022-01-10 | 2022-01-10 | Gas-liquid dual-purpose safety valve device |
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| Publication Number | Publication Date |
|---|---|
| CN217130427U true CN217130427U (en) | 2022-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220087522.XU Active CN217130427U (en) | 2022-01-10 | 2022-01-10 | Gas-liquid dual-purpose safety valve device |
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|---|---|
| CN (1) | CN217130427U (en) |
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- 2022-01-10 CN CN202220087522.XU patent/CN217130427U/en active Active
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