CN108563809A - The computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing - Google Patents
The computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing Download PDFInfo
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- CN108563809A CN108563809A CN201810016490.2A CN201810016490A CN108563809A CN 108563809 A CN108563809 A CN 108563809A CN 201810016490 A CN201810016490 A CN 201810016490A CN 108563809 A CN108563809 A CN 108563809A
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Abstract
The invention discloses a kind of computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing, including it is as follows：Step A, the simulated technological process that LPG cyoinders are released is established using technological process simulation softward；Step B, material is obtained to release required discharge area；Step C, safety check is carried out to liquefied petroleum gas process of releasing, and obtains the second peak value amount of releasing；Step D, when safety checks qualified, the second peak value amount of releasing is designed into the be must satisfy minimum amount of releasing as pressure relief system.When being designed to the pressure relief system of LPG cyoinders using this method, the effective protection to LPG cyoinders can not only be formed, and the investment of pressure relief system and ground flare will be greatly reduced.
Description
Technical field
The present invention relates to a kind of computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing.
Background technology
China has built a large amount of Tank Farm of Liquefied Petroleum in recent years, due to the leaking of liquefied petroleum gas, artificial maloperation etc.
The fire of initiation, explosion, intoxication accident are more.Safety valve (PSV) has obtained the protective action of such storage tank relatively broad
Approval.But when accident occurs, safety valve is only capable of controlling the pressure of system in release pressure and maximum allowable build pressure model
In enclosing, active pressure release can not be played the role of to tank body/pipeline, to can not actively reduce equipment/pipe stress, and prevented non-
Wetting surface is since hot-spot is ruptured more than the material stress limit, or reduces to burning things which may cause a fire disaster " dispensing " fuel.Pressure relief system
It is insufficient using this has been filled up just.
NORSOK Standard S-DP-001-1996《Design principles technical safety》Regulation
" when equipment exits and entrances valve is closed, pressure should be equipped with to the pressure vessel containing 1.0t hydrocarbons or untreated crude oil
Power bleed-off system ".Shell corporate specification also provides " in normal operation condition, to store 4m3 or more butane or volatility is stronger
The bleeder valve of remote control should be arranged in the pressure vessel of liquid ".It is domestic equally to use API 521-1997《Pressure-
relieving and depressuring systems》Related specifications SY/T 10043-2002 is worked out《Pressure release and decompression
System guide》, promote the popularization and application of pressure relief system.
API 521-2014 are that " pressure relief system should be in 15min, by equipment to fire working pressure release rate requirement
Operating pressure is down to the 50% or 690kPa (taking wherein minimum pressure) of design pressure from pressure of initially releasing ".Tank field ground
Torch is difficult the amount of releasing for meeting the liquefied petroleum gas storage tank pressure relief system according to this Specification Design.
Invention content
The technical problem to be solved by the present invention is to be set by API521-2014 for the pressure relief system for solving LPG cyoinders
The processing capacity of timing, ground flare cannot meet the problem of pressure relief system discharge capacity requires, it is proposed that a kind of liquefied petroleum gas
The computational methods of the storage tank pressure relief system amount of releasing.
The present invention is to solve above-mentioned technical problem by following technical proposals：
A kind of computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing, feature is, includes the following steps：
Step A, the simulated technological process that LPG cyoinders are released is established using technological process simulation softward, and obtains first
The peak value amount of releasing；
Step B, it is to bring hole into as basic data by the obtained first peak value amount of releasing and corresponding physical parameter
The calculation formula of plate obtains material and releases required discharge area；
Step C, it using the discharge area as the input data of Hysys dynamic pressure release modules, releases to liquefied petroleum gas
Process carries out safety check, and obtains the second peak value amount of releasing；
Step D, when safety checks qualified, the second peak value amount of releasing must satisfy as pressure relief system design
The minimum amount of releasing.
Preferably, in step A, using Aspen, Hysys, PROII technological process simulation softward, by establishing processing simulation
Flow or the method for dynamic analog obtain the first peak value amount of releasing.
Preferably, the first peak value amount of releasing operating mode is calculated by fire working.
Preferably, in step B, useCalculate the discharge area, wherein q is the quality of fluid
Flow velocity, i.e., the described first peak value amount of releasing, units/kg/h；α is discharge coefficient；ε is the coefficient of expansion；D is orifice diameter, unit
mm；ρ is fluid density, units/kg/m3；Δ p is the pressure drop before and after orifice plate, units/kg/cm2。
Preferably, pressure relief system uses the dynamic pressure release module of Hysys in step C.
Preferably, in step C, with the orifice plate of the first peak value amount of releasing corresponding physical data and the discharge area
Input data of the area as Hysys dynamic pressure release module fire workings, after flow convergence, when pressure inside the tank and temperature be not with outer
The progress of portion's fire and gradually rise, then safety is checked qualified.
Preferably, in step B, it is set as flashing 3 DEG C of increase every time.
The positive effect of the present invention is that：The pressure relief system of LPG cyoinders is designed using this method
When, the effective protection to LPG cyoinders can not only be formed, and the investment of pressure relief system and ground flare will be greatly reduced.
Description of the drawings
Fig. 1 is the computational methods flow chart of the liquefied petroleum gas storage tank pressure relief system amount of releasing of present pre-ferred embodiments.
Fig. 2 is that the LPG cyoinders rate of releasing of present pre-ferred embodiments changes over time relation schematic diagram.
Specific implementation mode
Preferred embodiment is enumerated below, and completely illustrates the present invention in conjunction with attached drawing to become apparent from.
As shown in Figure 1, the invention discloses a kind of computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing, it is special
Point is, includes the following steps：
Step A, the simulated technological process that LPG cyoinders are released is established using technological process simulation softward, and obtains first
The peak value amount of releasing；
Step B, it is to bring hole into as basic data by the obtained first peak value amount of releasing and corresponding physical parameter
The calculation formula of plate obtains material and releases required discharge area；
Step C, it using the discharge area as the input data of Hysys dynamic pressure release modules, releases to liquefied petroleum gas
Process carries out safety check, and obtains the second peak value amount of releasing；
Step D, when safety checks qualified, the second peak value amount of releasing must satisfy as pressure relief system design
The minimum amount of releasing.
In the advanced optimizing of the present embodiment, in step A, using Aspen, Hysys, PROII technological process simulation softward,
The first peak value amount of releasing is obtained by the method for establishing processing simulation flow or dynamic analog.
In the advanced optimizing of the present embodiment, the first peak value amount of releasing operating mode is calculated by fire working.
In the advanced optimizing of the present embodiment, in step B, useThe discharge area is calculated,
In, q is the mass velocity of fluid, i.e., the described first peak value amount of releasing, units/kg/h；α is discharge coefficient；ε is the coefficient of expansion；d
For orifice diameter, unit mm；ρ is fluid density, units/kg/m3；Δ p is the pressure drop before and after orifice plate, units/kg/cm2。
In the advanced optimizing of the present embodiment, pressure relief system uses the dynamic pressure release module of Hysys in step C.
In the advanced optimizing of the present embodiment, in step C, with the corresponding physical data of the first peak value amount of releasing and institute
Input data of the hole plate suqare of discharge area as Hysys dynamic pressure release module fire workings is stated, after flow convergence, when in tank
Pressure and temperature does not gradually rise with the progress of external fire, then safety is checked qualified.
In the advanced optimizing of the present embodiment, in step B, it is set as flashing every time and increases by 3 DEG C.
In specific implementation, with 2000m3Certain composition liquefied petroleum gas (table 1) storage tank (its specification of equipment be Φ 15 800 ×
50, table 2) for, pressure relief system peak value under fire working is described in detail and is released the computational methods of rate.
| C2H6 | C3H8 | i-C4H10 | n-C4H10 | i-C5H12 |
| 0.005 | 0.580 | 0.250 | 0.150 | 0.015 |
Table 1, liquefied petroleum gas each component molar fraction
Table 2, the operating condition of LPG cyoinders and design parameter
In step A, released process using Hysys software simulated fire operating mode LPG cyoinders.Under fire working, equipment
When interior pressure reaches BDV setting pressure (i.e. PAHH), pressure relief system starts to release.Due to liquefied petroleum gas composition, temperature, pressure
When condition is identical, rate of releasing is directly proportional to tank body operating pressure, to obtain the first peak value amount of releasing, it is assumed that tank body is in pressure release
PAHH pressure is remained in journey.Using physical property method identical with Dynamic Depressuring, parameter of materials, equipment ginseng
Number and operating parameter, are input in this simulated technological process, and set flash distillation every time and increase by 3 DEG C.After simulated technological process convergence, obtain such as figure
Rate of releasing in fire process shown in 2 changes with time situation.
According to flowsheeting as a result, under the influence of external fire hazard thermal amount, liquefied petroleum gas pressure tank is by normally grasping after 2.01h
PAHH is risen to as pressure, BDV valves are opened, and pressure release is started：With continually entering for fire heat, rate of releasing increases rapidly；Through
5h is crossed, rate of releasing reaches the first peak value amount of releasing 7.98 × 104kg/h；Then it constantly reduces；It is flashed by 8 times, 16.62h
Liquefied petroleum gas-liquid phase evaporating completely is gas phase in tank body afterwards, and simulation terminates.
Next B is entered step, in order to verify the feasibility of the program, needs to obtain flowsheeting peak value discharge area.
UsingCalculate the discharge area, wherein q is the mass velocity of fluid, i.e., described first peak value is released
Amount, units/kg/h；α is discharge coefficient；ε is the coefficient of expansion；D is orifice diameter, unit mm；ρ is fluid density, units/kg/m3；
Δ p is the pressure drop before and after orifice plate, units/kg/cm2。
By the first peak value amount of releasing 7.98 × 104Kg/h, fluid density density p=30.66kg/m3, p=9.684kg/cm2
It brings into formula, d=84.44mm is calculated, take restriction orifice aperture Φ=85mm.
Step C carries out safety check, by hole plate suqare (5675mm2) release face as DynamicDepressuring
Product typing Hysys dynamic pressure release modules obtain in 10h gas phase temperature, pressure in LPG cyoinders and change with time relationship.
Situation is changed over time from gas phase temperature in LPG cyoinders：Gas phase temperature with release time lengthening and by
It is decrescence small.In the starting stage, temperature highest (for 55.65 DEG C) is reduced to 27.75 DEG C after 10h；Gaseous pressure is also with the process of releasing
It is gradually reduced, in the starting stage, pressure highest (for 1250kPa) is down to 305kPa after 10h.This result and pertinent literature (king
Your army, Song Fenglian, the strong compressor assembly bleeder valves of Liu's fire calculate [J] Oil ＆ Gas Storages, 2015,34 (4)：413-416.) simulate
Compressor pressure relief system temperature, that pressure changes over time trend is almost the same.
In dynamic pressure leak process, the amount of releasing is gradually reduced with the time of releasing.Starting stage release rate maximum, thus
Obtain the second peak value amount of releasing of dynamic analog.
As it can be seen that when pressure relief system hole plate suqare is using the flowsheeting peak value amount of releasing corresponding discharge area, liquefied petroleum
Gas tank operation temperature, operating pressure are no more than LPG cyoinders design temperature, PAHH, to ensure LPG cyoinders
Safe operation.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
Under the premise of from the principle and substance of the present invention, many changes and modifications may be made, but these are changed
Protection scope of the present invention is each fallen with modification.
Claims (7)
1. a kind of computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing, which is characterized in that include the following steps：
Step A, the simulated technological process that LPG cyoinders are released is established using technological process simulation softward, and obtains the first peak value
The amount of releasing；
Step B, it is to bring orifice plate into as basic data by the obtained first peak value amount of releasing and corresponding physical parameter
Calculation formula obtains material and releases required discharge area；
Step C, it using the discharge area as the input data of Hysys dynamic pressure release modules, releases process to liquefied petroleum gas
Safety check is carried out, and obtains the second peak value amount of releasing；
Step D, when safety checks qualified, the second peak value amount of releasing must satisfy most as pressure relief system design
The small amount of releasing.
2. the computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing as described in claim 1, which is characterized in that step
In A, using Aspen, Hysys, PROII technological process simulation softward, by the side for establishing processing simulation flow or dynamic analog
Method obtains the first peak value amount of releasing.
3. the computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing as claimed in claim 2, which is characterized in that described
The first peak value amount of releasing operating mode is calculated by fire working.
4. the computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing as described in claim 1, which is characterized in that step
In B, useCalculate the discharge area, wherein q is the mass velocity of fluid, i.e., described first peak value
The amount of releasing, units/kg/h；α is discharge coefficient；ε is the coefficient of expansion；D is orifice diameter, unit mm；ρ is fluid density, unit
kg/m3；Δ p is the pressure drop before and after orifice plate, units/kg/cm2。
5. the computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing as described in claim 1, which is characterized in that step
Pressure relief system uses the dynamic pressure release module of Hysys in C.
6. the computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing as described in claim 1, which is characterized in that step
In C, using the hole plate suqare of the corresponding physical data of the first peak value amount of releasing and the discharge area as Hysys, dynamic is let out
The input data of die block fire working, after flow convergence, when pressure inside the tank and temperature are gradual not with the progress of external fire
It increases, then safety is checked qualified.
7. the computational methods of the liquefied petroleum gas storage tank pressure relief system amount of releasing as described in claim 1, which is characterized in that step
In B, it is set as flashing 3 DEG C of increase every time.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113919161A (en) * | 2021-10-14 | 2022-01-11 | 圣泰(北京)工程软件有限公司 | Optimization method for calculating discharge capacity of flare system and optimization method for pressure discharge analysis of flare system |
| CN114647899A (en) * | 2020-12-17 | 2022-06-21 | 宝能汽车集团有限公司 | Pressure relief caliber calculation method and device, storage medium and electronic equipment |
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| JP2013214299A (en) * | 2012-03-07 | 2013-10-17 | Shimizu Corp | Physical quantity simulation method, and physical quantity simulation system using the same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2013214299A (en) * | 2012-03-07 | 2013-10-17 | Shimizu Corp | Physical quantity simulation method, and physical quantity simulation system using the same |
| CN103853875A (en) * | 2013-12-13 | 2014-06-11 | 森松(江苏)海油工程装备有限公司 | Method for simulating gas expansion in container caused by external heat input |
Non-Patent Citations (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114647899A (en) * | 2020-12-17 | 2022-06-21 | 宝能汽车集团有限公司 | Pressure relief caliber calculation method and device, storage medium and electronic equipment |
| CN113919161A (en) * | 2021-10-14 | 2022-01-11 | 圣泰(北京)工程软件有限公司 | Optimization method for calculating discharge capacity of flare system and optimization method for pressure discharge analysis of flare system |
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