CN202302714U - Automatic pressure relief device of low pressure tank - Google Patents
Automatic pressure relief device of low pressure tank Download PDFInfo
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- CN202302714U CN202302714U CN2011204120945U CN201120412094U CN202302714U CN 202302714 U CN202302714 U CN 202302714U CN 2011204120945 U CN2011204120945 U CN 2011204120945U CN 201120412094 U CN201120412094 U CN 201120412094U CN 202302714 U CN202302714 U CN 202302714U
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Abstract
The utility model discloses an automatic pressure relief device of a low pressure tank, wherein pressure switches (2), a pressure relief valve group (4) and a pressure compensation valve group (5) are communicated with a gas phase of a low pressure tank (1), two or four pressure switches (2) are arranged, and the transmission signal of the pressure switches (2) respectively controls the pressure relief valve group (4) or the pressure compensation valve group (5), or simultaneously controls the opening and closing of the pressure relief valve group (4) and the pressure compensation valve group (5). Through arranging the pressure switches (2) on the gas phase of the low pressure tank (1), during the normal collecting, releasing and storing processes of the low pressure tank, resources are reasonably utilized, so the pressure of the gas phase in the tank is maintained within an appropriate scope which not only does not exceed the emergency releasing of the design pressure but also does not pump the tank at lower pressure to be shrunk, the emergency releasing is avoided, the energy is saved, the consumption is reduced, and the tank is guaranteed to safely operate.
Description
Technical field
The utility model belongs to petrochemical industry low pressure tank technical field, and what relate generally to is that a kind of low pressure tank is mended pressure relief device automatically.Be applicable to low pressure tank receive, pay, in the course of normal operation such as storage, a gaseous pressure in rationally utilizing jar is avoided emergency drain, guarantees the storage tank safe operation.
Background technique
Low pressure tank in API Std620:2002 " design of large-scale welding low pressure tank and construction ", be defined as " ... the storage tank metal temperature be no more than 250 ℉ (121 ℃) and jar in gas or the steam space be no more than 15lb/in
2(0.1MPa) storage tank of gauge pressure." domestic design and the construction of in most cases carrying out low pressure tank with reference to this standard, oil and gas industry standard SY/T 0608-2006 " design of large-scale welding low pressure tank and construction " has carried out revising employing to above-mentioned standard.
Petroleum chemical industry standard SH/T 3007-2007 " Oil Storage and Transport System of Petrochemistry tank field design code " 4.2.3 money regulation: " saturation vapor pressure should be selected low pressure tank or pressure vessel for use more than or equal to atmospheric material under the storage temperature.”?。The designer is when the storage tank type selecting, and general consideration is selected according to the ultimate property of material, that is to say, if vapour tension repeatedly occurs greater than atmospheric situation, just according to designing than exacting terms, selects low pressure tank or pressure vessel for use.Because pressure vessel limit by conditions such as construction cost, tank volume, in the high throughput industrial processes, during the approaching or superatmospheric slightly material of storage saturation vapour pressure, low pressure tank is a kind of rational selection.
According to code requirement, low pressure tank need be considered Decompression valves and vacuum Decompression valves when design, cause the storage tank unstability to prevent head space gas phase superpressure and negative pressure.Decompression valves is generally realized with safety valve, after the storage tank tank deck gas phase superpressure as the emergency facilities under the accident condition; Safety valve direct action; The gaseous pressure low-pressure pipe network to downstream of releasing fast prevents that the storage tank superpressure from causing disastrous accident, and safety valve need carry out the level pressure test again after the pressure release; The vacuum Decompression valves need have suitable source of the gas to replenish into jar as the emergency service under the storage tank negative pressure state, and after the storage tank negative pressure was low to moderate vacuum Decompression valves operating pressure, the vacuum Decompression valves was opened automatically, and gas make-up is advanced jar, prevents that the storage tank negative pressure from taking out flat.These two kinds of equipment only use under the state of emergency, are not allow these two kinds of device motion in the normal productive process.
Being controlled at for the gaseous pressure that can guarantee low pressure tank in the scope of Decompression valves and the akinesia of vacuum Decompression valves, also is the operation pressure scope of low pressure tank, and the common practice is that pressure release and ftercompction are carried out in manual work, and the material medium stored owing to low pressure tank is lighter; The factor affecting such as gentle supplied materials of being bullied is big, and the fluctuation of head space gas phase pressure is very big, and when the gentle temperature rise of rewinding process, pressure rises very fast; When paying the decline of material process and temperature, pressure descends very fast, and the manual operation difficulty is big; Cause the waste of gaseous pressure easily, the gas phase amount of releasing is big, simultaneously; It is big that gas (being generally nitrogen) is mended amount, be unfavorable for saving energy and reduce the cost, and; Careless slightly, with the accident action that causes Decompression valves and vacuum Decompression valves, bring hidden danger for the safe operation of storage tank.
How can in daily production process, keeping a jar interior gaseous pressure and be in a normal scope, make rational use of resources, avoid emergency drain, promptly is the utility model problem anxious to be solved.
Summary of the invention
The purpose of the utility model is to propose a kind of low pressure tank to mend pressure relief device automatically; Make that it is normally received at low pressure tank, pays, in the storage process; Make rational use of resources, the gaseous pressure in keeping jar be in one not only be no more than design pressure promptly release, but also only low pressure take out the OK range of flat storage tank, avoid emergency drain; Energy-saving and cost-reducing, guarantee the storage tank security of operation.
The utility model realizes that the technological scheme that above-mentioned purpose is taked is: it mainly reaches the Decompression valves group, pressure-supplementing valve group and the pressure switch that are communicated with it by low pressure tank and forms; Two or four pressure switches are set on the low pressure tank gas phase; The signal of pressure switch transmission is used for controlling respectively the switch of Decompression valves group or pressure-supplementing valve group, perhaps controls the open and close of Decompression valves group and pressure-supplementing valve group simultaneously.
The design principle of the utility model be according to low pressure tank when rewinding process or temperature raise, along with gas-phase space
The volatilization aggravation of minimizing and material, gaseous pressure constantly rises, and when being lower than safety valve emergency drain pressure, just operates pressure release normally and reduces the pressure release amount as far as possible; When paying the decline of material process or temperature; Along with the expansion of gas-phase space and the compression of gas phase self, gaseous pressure constantly descends, and before being higher than the urgent tonifying Qi pressure of vacuum Decompression valves, just operates ftercompction normally and reduces the ftercompction amount as far as possible; Thereby keep the scope that jar interior gaseous pressure is in a best; Under the prerequisite of energy saving, avoid emergency drain, guarantee the stable operation of storage tank.
Because petrochemical industry is produced and is designed with the low pressure releasing system usually, can discharge during tank deck mixed oil and gas superpressure; And the gas that nitrogen or other permission are provided is used for mending gas phase, keeps a jar interior micro positive pressure.Therefore two groups of valve groups of control are automatically arranged, be respectively applied for pressure release and ftercompction; On the tank deck gas phase, draw four tunnel pressure switches then; Be set at low pressure tank respectively and mend high, high and low, the low operating pressure of pressure relief device automatically; Supervisory system through the control room is handled, and when the head space gas phase pressure rose paramount high pressure, the Decompression valves group was opened discharging; When pressure dropped to high pressure, the Decompression valves group was closed and is stopped discharging with the minimizing amount of releasing; The head space gas phase pressure drops to when hanging down low pressure, and the pressure-supplementing valve group is opened tonifying Qi, when pressure rises to low pressure; The pressure-supplementing valve group is closed and is stopped ftercompction and reduce gas phase and mend into amount and only keep jar an interior micro positive pressure, thereby realization can effectively utilize the evaporativity of material self, the quantity of minimizing pressure release; The benefit that can as far as possible reduce external gas is again gone into, and reduce to consume, realize low pressure tank in course of normal operation, keep jar in gas phase be in suitable pressure range; Avoid emergency drain, guarantee the storage tank security of operation.
On the basis of such scheme; The utility model is also established the gas-liquid equilibrium pipe between the low pressure tank of material of the same race, realize the complementation of each jar gas phase, avoids occurring a storage tank in ftercompction and another contradictory phenomena in pressure release; Further reduce overpressure relief and low pressure mend into, energy conservation and consumption reduction effects is obvious.
The utility model is monitored gaseous pressure teletransmission to the control room of low pressure tank, and realization high and low pressure alarm signal is reported to the police automatically.If it is when mending the pressure relief system fault automatically, can in time manually mend pressure release, thereby possibly reducing to of storage tank superelevation, low pressure is minimum.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Among the figure, the 1-low pressure tank; 2-gaseous pressure switch; The 3-safety valve; 4-Decompression valves group; 5-pressure-supplementing valve group; The 6-pressure relief pipe; 7-ftercompction source of the gas.
Embodiment
Further specify below in conjunction with 1 pair of the utility model of accompanying drawing, its purpose is to explain better the content and the implementation of the utility model, the restriction of the example that the protection domain of the utility model does not receive to be lifted.In the accompanying drawings, supplementary equipment more known in those skilled in the art such as conventional valve, instrument etc. are not indicated.
As shown in Figure 1: the low pressure vault chemical industry light oil storage tank that the said low pressure tank 1 of present embodiment is nominal volume 5000m3; Design pressure＜0.1MPa; The highest operation pressure that technology allows is 0.08MPa and keeps malleation that in storage tank rewinding and temperature uphill process, gaseous pressure constantly rises; Pay in material and the temperature decline process at storage tank, gaseous pressure constantly descends.Keeping on the basis of manually mending pressure release, on the head space gas phase space of low pressure tank 1, be provided with four pressure switches 2, level pressure is 0.08MPa (high), 0.07MPa (height), 0.03MPa (low), 0.02MPa (low) respectively.Also can only arrange two pressure switches 2; Level pressure is 0.08MPa (high) and 0.07MPa (height) respectively; Perhaps level pressure is 0.03MPa (low) and 0.02MPa (low), only realizes two point control releasing pressure automaticallies or the automatic ftercompction of two point control, and pressure release and ftercompction do not have inevitable binding relation.
Pressure switch 2 (pressure controller) is a kind of simple pressure control device; Select according to parameters such as pressure range, operating conditions during design selection; Can install after verification is qualified; Be connected through the adapter of tank deck impulse with low pressure tank, using more brand at present has U.S. SOR series, Nagano, Japan series etc.Select to use the 4B4-K4-M4-C2A-TT-CL-PK-YY pressure switch in the U.S. SOR series in this example.The output terminal of pressure switch 2 is introduced the supervisory system in control room through signaling line; When being reached rating value by measuring pressure; Pressure switch can give the alarm or control signal; Realize the SC sigmal control Decompression valves group 4 and 5 actions of pressure-supplementing valve group of pressure switch, the unified control room of introducing of all signals is convenient to operator field condition is monitored.
Simultaneously; Realize that gaseous pressure teletransmission to control room shows and warning, the low pressure tank of identical material is complementary through realizing gas phase gas phase connecting tube, thereby on the basis that guarantees the storage tank safe operation; Rationally utilize the evaporation potential of material self; Avoid emergency drain, reduce overpressure relief and ambient atmos mend into, save energy and reduce the cost.
Claims (5)
1. a low pressure tank is mended pressure relief device automatically; Comprise low pressure tank (1) and the Decompression valves group (4) and the pressure-supplementing valve group (5) that are communicated with it; It is characterized in that: two or four pressure switches (2) are set on said low pressure tank (1); The signal of pressure switch (2) transmission is controlled the open and close of said Decompression valves group (4) or pressure-supplementing valve group (5) respectively, perhaps controls the open and close of Decompression valves group (4) and pressure-supplementing valve group (5) simultaneously.
2. low pressure tank according to claim 1 is mended pressure relief device automatically; It is characterized in that: said pressure switch (2) is four; Level pressure is high, high and low, low respectively, and high, the high signal of said pressure switch (2) transmission is used to control the open and close of Decompression valves group (4); Low, the low signal of transmission is used to control the open and close of pressure-supplementing valve group (5).
3. low pressure tank according to claim 1 is mended pressure relief device automatically; It is characterized in that: said pressure switch (2) is two; Level pressure is low, low for high, high or level pressure respectively; When said pressure switch (2) level pressure was high, high, high, the high signal of transmission was used to control the open and close of Decompression valves group (4); When said pressure switch (2) level pressure was low, low, low, the low signal of transmission was used to control the open and close of pressure-supplementing valve group (5).
4. low pressure tank according to claim 1 is mended pressure relief device automatically, it is characterized in that: said pressure switch (2) is introduced the supervisory system in control room through lead, realizes the telecontrol valve switch through system's conversion.
5. low pressure tank according to claim 1 is mended pressure relief device automatically, it is characterized in that: between the low pressure tank tank deck gas phase of limited a plurality of media of the same race, be set gas phase connecting tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204120945U CN202302714U (en) | 2011-10-26 | 2011-10-26 | Automatic pressure relief device of low pressure tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204120945U CN202302714U (en) | 2011-10-26 | 2011-10-26 | Automatic pressure relief device of low pressure tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202302714U true CN202302714U (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204120945U Expired - Fee Related CN202302714U (en) | 2011-10-26 | 2011-10-26 | Automatic pressure relief device of low pressure tank |
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| CN (1) | CN202302714U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344127A (en) * | 2015-11-30 | 2016-02-24 | 新疆大全新能源有限公司 | Rectifying tower system and method and device for stabilizing pressure of rectifying tower |
| CN107420740A (en) * | 2017-08-07 | 2017-12-01 | 中国核工业第五建设有限公司 | Gas pressure control system in LNG tank |
| CN108413243A (en) * | 2018-06-12 | 2018-08-17 | 东北石油大学 | A kind of vertical storage tank promptly surpasses, the automatic balancing arrangement of negative pressure |
| CN109099312A (en) * | 2018-09-08 | 2018-12-28 | 彭圭 | Cold drum or crude benzol workshop section emission-control equipment and the method for intelligent pressure maintaining and control oxygen |
| CN112050073A (en) * | 2020-07-29 | 2020-12-08 | 邯郸钢铁集团有限责任公司 | Liquid storage tank pressurizing and depressurizing method |
| CN112978837A (en) * | 2019-12-16 | 2021-06-18 | 中国石油天然气股份有限公司 | Gas field water tank work system |
| CN114044278A (en) * | 2021-11-10 | 2022-02-15 | 常州艾恩希纳米镀膜科技有限公司 | Automatic pressure maintaining system for CVD coating liquid raw material tank |
| CN115155089A (en) * | 2022-06-23 | 2022-10-11 | 泰兴金江化学工业有限公司 | Pressure balancing device for ethyl acetate rectifying tower |
-
2011
- 2011-10-26 CN CN2011204120945U patent/CN202302714U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344127A (en) * | 2015-11-30 | 2016-02-24 | 新疆大全新能源有限公司 | Rectifying tower system and method and device for stabilizing pressure of rectifying tower |
| CN107420740A (en) * | 2017-08-07 | 2017-12-01 | 中国核工业第五建设有限公司 | Gas pressure control system in LNG tank |
| CN108413243A (en) * | 2018-06-12 | 2018-08-17 | 东北石油大学 | A kind of vertical storage tank promptly surpasses, the automatic balancing arrangement of negative pressure |
| CN108413243B (en) * | 2018-06-12 | 2024-05-03 | 东北石油大学 | Automatic balancing device for emergency super and negative pressure of vertical storage tank |
| CN109099312A (en) * | 2018-09-08 | 2018-12-28 | 彭圭 | Cold drum or crude benzol workshop section emission-control equipment and the method for intelligent pressure maintaining and control oxygen |
| CN109099312B (en) * | 2018-09-08 | 2024-04-19 | 山东环易达环保科技有限公司 | Cold drum or crude benzene section waste gas treatment device and intelligent pressure maintaining and oxygen controlling method |
| CN112978837A (en) * | 2019-12-16 | 2021-06-18 | 中国石油天然气股份有限公司 | Gas field water tank work system |
| CN112050073A (en) * | 2020-07-29 | 2020-12-08 | 邯郸钢铁集团有限责任公司 | Liquid storage tank pressurizing and depressurizing method |
| CN114044278A (en) * | 2021-11-10 | 2022-02-15 | 常州艾恩希纳米镀膜科技有限公司 | Automatic pressure maintaining system for CVD coating liquid raw material tank |
| CN115155089A (en) * | 2022-06-23 | 2022-10-11 | 泰兴金江化学工业有限公司 | Pressure balancing device for ethyl acetate rectifying tower |
| CN115155089B (en) * | 2022-06-23 | 2024-01-05 | 泰兴金江化学工业有限公司 | Pressure balancing device for ethyl acetate rectifying tower |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20191026 |