CN203392270U - Raw material storage tank having nitrogen sealing protection function in benzene hydrogenation device - Google Patents
Raw material storage tank having nitrogen sealing protection function in benzene hydrogenation device Download PDFInfo
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- CN203392270U CN203392270U CN201320464199.4U CN201320464199U CN203392270U CN 203392270 U CN203392270 U CN 203392270U CN 201320464199 U CN201320464199 U CN 201320464199U CN 203392270 U CN203392270 U CN 203392270U
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Abstract
The utility model relates to a raw material storage tank having a nitrogen sealing protection function in a benzene hydrogenation device. The raw material storage tank comprises a tank body, a tank cover is fixedly arranged at the top of the tank body, an inner floating roof capable of moving up and down is arranged in the tank body, the upper portion of a side wall of the tank body is provided with 2-6 vent holes, the vent holes are sealed, the tank cover is provided with a nitrogen sealing device and a breathing valve, the nitrogen sealing device comprises a nitrogen supply valve and a nitrogen discharging valve, the nitrogen supply valve is connected to the tank cover through a nitrogen inlet pipe, and the nitrogen discharging valve is connected to the tank cover through a nitrogen outlet pipe. The nitrogen sealing device has the effects of sealing and protecting benzene materials in the raw material storage tank, benzene volatilization loss is effectively reduced, environmental pollution caused by benzene volatilization is avoided simultaneously, major accidents of ignition and explosion easily caused by thunder are avoided, and economic benefit is increased.
Description
Technical field
The utility model relates to a kind of raw material storage tank, specifically a kind of raw material storage tank that is applied to have in benzene hydrogenation device nitrogen protection effect.
Background technology
Benzene hydrogenation method is domestic and international crude benzene refining vanguard technology, crude benzene refining technique is that crude benzol cut is carried out to catalytic hydrogenation, remove the impurity compositions such as sulphur, nitrogen, then hydrogenated oil is carried out to rectification and purification separation and obtain benzene, toluene and dimethylbenzene product, and the benzene obtaining, toluene quality are high, belong to the production technology of environmental protection.Benzene hydrogenation apparatus system is complicated, equipment is many, raw material storage tank Wei Yi top in benzene hydrogenation device is fixedly connected with the cell body of storage tank lid, cell body inside is provided with inner floating roof, inner floating roof is in order to seal material in cell body, structure as shown in Figure 1, inner floating roof is one deck aluminium sheet, by polylith aluminium sheet, be connected to form, the bottom of inner floating roof is connected with support, frame bottom is fixedly installed a plurality of floating drums and a plurality of support post, floating drum can produce buoyancy upwards, inner floating roof is under the double action of buoyancy and gravity, with medium liquid level, fluctuate, inner floating roof edge and cell body contact position arrange leather bag to play sealing function, support post is for inner floating roof lower space is provided when overhauling inner floating roof.The inner symmetrical both sides of storage tank respectively have steel cable from top through inner floating roof link slot at the bottom of, prevent that inner floating roof from rotating in unsteady process under water.An air extractor vent that is provided with DN300 at cell body top, cell body upper side is provided with 2-6 air extractor vent by cell body volume difference, the about 0.1m of each air extractor vent area
2; In production application process, find that this device exists following shortcoming:
1, because there are gap and leather bag in every aluminium sheet junction of inner floating roof, contact with cell body and when tight or medium liquid level declines, on cell wall, leave medium, easily cause inner floating roof top to have a large amount of medium steams, when particularly groove in summer top temperature is higher, large quantity of air is due to convection action, from side air extractor vent, suck, along groove top air extractor vent, discharge, cause a large amount of benzene class steam to evaporate in air, cause the loss of benzene class, contaminated environment.
2, whole cell body is without lightning protection, the air extractor vent that is positioned at top during thunderstorm has played the thunder effect that connects, when having a large amount of benzene class steam volatilization, its top air extractor vent benzene vapour concentration is: take purified petroleum benzin groove as example: according to Peter Antonie for saturated vapour pressure (Antoine) Solving Equations of benzene, toluene and ethylbenzene, calculate
Be lgP
0=A-B/ (t+C)
T-------system temperature in formula, ℃
P
0-----saturated vapour pressure, kPa
A, B, C---Peter Antonie Changshu.
The Peter Antonie constant of benzene sees attached list.
| Peter Antonie constant | A | B | C |
| Benzene | 6.023 | 1206.35 | 220.24 |
Summer, purified petroleum benzin temperature was by 35 ℃ of calculating,
lgP
0＝A－B/(t+C)
lgP
0＝6.023-1206.35/(35+220.24)
lgP
0＝1.30 P
0＝19.95kPa
Under normal pressure, benzene vapour concentration is v%=19.95/101.3 * 100%
v%=19.7%
And the explosive limits scope of benzene is 1.2-8.0(%), and calculate according to theory, the liquid level of cell body and the benzene vapour concentration between inner floating roof in the time of 35 ℃ far above the explosive limits scope of benzene, so within inner floating roof top very easily reaches explosive limits, thunderstorm hour very easily causes the great serious accident of Fire explosion.
According to theory, calculate, the liquid level of cell body and the benzene vapour concentration between inner floating roof are 19.7%(v/v in the time of 35 ℃).Barrier effect due to inner floating roof, in space between inner floating roof and groove top, benzene vapour concentration will reduce, and by 1/10th calculating, benzene vapour concentration contains 2%(v/v) left and right, temperature compare Gao Shi top air extractor vent gas flow rate is 0.5m/s, and top air extractor vent gas flows amount is:
Vs=3.14×0.15×0.15×0.5×3600
Vs=127m
3/h
The benzene amount of carrying is:
127×2%/22.4×78=8.84kg/h
Groove district has 16 storage tanks, can discharge less every year benzene class amount to be:
8.84×16×24×365=1239t/y
Benzene class is by 8600 yuan/ton of calculating, and loss benefit is:
Ten thousand yuan/year of 1239 * 8600=1065.54()
When 3, material is thick, light benzene in cell body, in thick, light benzene, contain sulfide, be easy to the ferrous sulphide that cell body wall forms easy spontaneous combustion, when in cell body, liquid level declines, the ferrous sulphide forming is directly exposed in air, because spontaneous combustion very easily makes cell body, produces Fire explosion, causes great serious accident.
Summary of the invention
For the deficiencies in the prior art; the utility model provides the raw material storage tank of protecting with nitrogen envelope in a kind of benzene hydrogenation device, and the air extractor vent that this device has been eliminated existing raw material storage tank causes benzene hydrocarbon gase to extraneous volatilization, to cause the hidden danger of environmental pollution and fire hazardous.
The technical solution of the utility model is as follows:
The raw material storage tank of protecting with nitrogen envelope in a kind of benzene hydrogenation device; comprise cell body; cell body top is fixedly installed groove lid, and cell body inside is provided with inner floating roof moving up and down, and cell body side wall upper part is provided with 2-6 air extractor vent; it is characterized in that; described air extractor vent is sealing, and groove covers and is provided with nitrogen seal device and breathing valve, and described nitrogen seal device comprises for nitrogen valve and lets out nitrogen valve; for nitrogen valve, by nitrogen inlet pipe, be connected to groove and cover, let out nitrogen valve and by nitrogen, go out pipe and be connected to groove and cover.
The utility model is preferred, and described groove lid is arch configuration, and breathing valve is arranged on Cao Gai center, nitrogen seal device for nitrogen valve and let out the periphery that nitrogen valve is arranged on breathing valve.The groove of existing benzene hydrogenation device Raw storage tank covers and is provided with air extractor vent; the utility model has replaced existing air extractor vent with breathing valve; the expiration of breathing valve and suction pressure are far above supplying nitrogen valve and inflation and the relieving pressure of letting out nitrogen valve; only have when supplying nitrogen valve and letting out nitrogen valve to break down; for preventing raw material storage tank hypertonia or the too low cell body that damages, breathing valve plays temporary transient protective effect.
Further preferred, described supplying nitrogen valve and let out nitrogen valve is oppositely arranged.
The utility model is preferred, and the bottom of described inner floating roof is connected with support, and frame bottom is connected with floating drum and support post.
The utility model is preferred, is provided with anti-rotation rope in cell body, and anti-rotation rope one end is connected to groove and covers, and the other end is connected to cell body bottom through inner floating roof, and described anti-rotation rope is two, is symmetricly set on cell body inside.Anti-rotation rope is for preventing that inner floating roof from rotating in the unsteady process of liquid.
The utility model is preferred, and described nitrogen inlet pipe is connected with the nitrogen inlet pipe of adjacent raw material storage tank.Described light, crude benzol raw material storage tank is because frequency of usage is higher, and nitrogen seal device operation is frequent, and use that nitrogen inlet pipe is connected with the nitrogen inlet pipe of adjacent raw material storage tank has improved the safety factor of raw material storage tank.
Preferably, described breathing valve is fire-retardant breather valve.
Nitrogen seal device of the present utility model is by for nitrogen valve with let out nitrogen valve two parts and form.For nitrogen valve, by pilot valve and main valve two parts, formed; Letting out nitrogen valve is comprised of the type that the presses off micropressure adjusting valve of internal feedback.When adding materials in raw material storage tank, liquid level rises, gas phase partial volume between inner floating roof and groove lid reduces, and pressure raises, when raw material storage tank internal pressure rises to when letting out nitrogen valve pressure set points, pressure feedback is to letting out on nitrogen valve, let out nitrogen valve and open, to extraneous liberating nitrogen gas, tank internal pressure is declined, be down to while letting out nitrogen device pressure set-point, let out nitrogen device and automatically close.When raw material storage tank blowing, liquid level declines, and the gas phase partial volume between inner floating roof and groove lid increases, raw material storage tank internal pressure reduces, and opens, to nitrogen injection in raw material storage tank for nitrogen valve, make raw material storage tank internal pressure increase, when raw material storage tank internal pressure rises to for nitrogen valve, automatically close.Raw material storage tank nitrogen seal device has to imitate and reduces the volatilization of benzene class and cause loss of material, has avoided the volatilization of benzene class to cause environmental pollution simultaneously.
Compare with existing benzene hydrogenation device Raw storage tank, the utlity model has following advantage:
1, the air extractor vent of benzene hydrogenation device raw material storage tank cell body side wall upper part of the present utility model is sealing; avoided existing air extractor vent circulation effect to cause benzene class material to the external world, to wave loose; at groove, cover and be provided with nitrogen seal device and breathing valve; nitrogen seal device plays benzene class material in seal protection raw material storage tank; even if the leather bag between inner floating roof edge and cell body is aging; also can effectively reduce benzene class air loss, avoid the volatilization of benzene class to cause environmental pollution simultaneously.
2, nitrogen seal device of the present utility model makes the gas phase part between inner floating roof and groove lid can not have benzene class steam, eliminate benzene hydrocarbon gase and caused environmental pollution to extraneous volatilization, avoid thunderstorm hour very easily to cause the great serious accident of Fire explosion, increased economic benefit.
3, the utility model is simple in structure, easy to operate, and environmental pollution is thoroughly improved, and is suitable for large-scale promotion utilization.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing benzene hydrogenation device Raw storage tank;
Fig. 2 is the structural representation of the raw material storage tank with the protection of nitrogen envelope of the present utility model;
Fig. 3 is the nitrogen inlet pipe cascaded structure schematic diagram of nitrogen inlet pipe and adjacent raw material storage tank.
1, the air extractor vent on cell body sidewall, 2, the air extractor vent that covers of groove, 3, inner floating roof, 4, for nitrogen valve, 5, let out nitrogen valve, 6, breathing valve, 7, support post, 8, anti-rotation rope.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
In embodiment for nitrogen valve, let out nitrogen valve all purchased from Chongqing Chuanwu Instrument Co., Ltd., model: V-500c, latus rectum DN25.Fire-retardant breather valve is purchased from Chinese Volkswagen Valve Group Co.,Ltd, model: CYH-17, malleation: 980Mpa, negative pressure: 295Mpa.
Embodiment 1:
The raw material storage tank of protecting with nitrogen envelope in a kind of benzene hydrogenation device; structure as shown in Figure 2; comprise cell body; cell body top is fixedly installed groove lid; groove lid is arch configuration; cell body inside is provided with inner floating roof 3 moving up and down, and the bottom of inner floating roof is connected with support (not shown), and frame bottom is connected with floating drum (not shown) and support post 7.In cell body, be also provided with anti-rotation rope 8, anti-rotation rope 8 one end are connected to groove and cover, and the other end is connected to cell body bottom through inner floating roof 3, and anti-rotation rope 8 is two, is symmetricly set on cell body inside.Cell body side wall upper part is provided with 2 air extractor vents 2, air extractor vent 2 is sealing, and groove covers and is provided with nitrogen seal device and breathing valve 6, and nitrogen seal device comprises for nitrogen valve 4 and lets out nitrogen valve 5, for nitrogen valve 4, by nitrogen inlet pipe, be connected to groove and cover, let out nitrogen valve 5 and by nitrogen, go out pipe and be connected to groove and cover.Breathing valve 6 is arranged on Cao Gai center, supplies nitrogen valve 4 and lets out the periphery that nitrogen valve 5 is arranged on breathing valve 6, supplies nitrogen valve 4 and let out nitrogen valve 5 to be oppositely arranged, and breathing valve 6 is fire-retardant breather valve.
Embodiment 2:
In benzene hydrogenation device, with the raw material storage tank of nitrogen envelope protection, structure is with embodiment 1, and difference is,
Described nitrogen inlet pipe is connected with the nitrogen inlet pipe of adjacent raw material storage tank, and structure as shown in Figure 3.On the nitrogen inlet pipe of series connection, be provided with valve, the state of valve in opening during use, be equivalent to a raw material storage tank and there are two cover nitrogen seal devices, one of them nitrogen seal device cisco unity malfunction, another works on, and storage tank nitrogen seal pressure is unaffected, and safety factor doubles, in adjacent feed storage tank, should be medium of the same race, otherwise dielectric property can be affected.
Claims (7)
1. the raw material storage tank of protecting with nitrogen envelope in a benzene hydrogenation device; comprise cell body; cell body top is fixedly installed groove lid, and cell body inside is provided with inner floating roof moving up and down, and cell body side wall upper part is provided with 2-6 air extractor vent; it is characterized in that; described air extractor vent is sealing, and groove covers and is provided with nitrogen seal device and breathing valve, and described nitrogen seal device comprises for nitrogen valve and lets out nitrogen valve; for nitrogen valve, by nitrogen inlet pipe, be connected to groove and cover, let out nitrogen valve and by nitrogen, go out pipe and be connected to groove and cover.
2. the raw material storage tank with nitrogen envelope protection according to claim 1, is characterized in that, described groove lid is arch configuration, and breathing valve is arranged on Cao Gai center, nitrogen seal device for nitrogen valve and let out the periphery that nitrogen valve is arranged on breathing valve.
3. the raw material storage tank with the protection of nitrogen envelope according to claim 2, is characterized in that, described supplying nitrogen valve and let out nitrogen valve is oppositely arranged.
4. the raw material storage tank with the protection of nitrogen envelope according to claim 1, is characterized in that, the bottom of described inner floating roof is connected with support, and frame bottom is connected with floating drum and support post.
5. the raw material storage tank with the protection of nitrogen envelope according to claim 1, is characterized in that, is provided with anti-rotation rope in cell body; anti-rotation rope one end is connected to groove and covers; the other end is connected to cell body bottom through inner floating roof, and described anti-rotation rope is two, is symmetricly set on cell body inside.
6. the raw material storage tank with the protection of nitrogen envelope according to claim 1, is characterized in that, described nitrogen inlet pipe is connected with the nitrogen inlet pipe of adjacent raw material storage tank.
7. according to the raw material storage tank with the protection of nitrogen envelope described in claim 1-6 any one, it is characterized in that, described breathing valve is fire-retardant breather valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320464199.4U CN203392270U (en) | 2013-07-31 | 2013-07-31 | Raw material storage tank having nitrogen sealing protection function in benzene hydrogenation device |
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|---|---|---|---|
| CN201320464199.4U CN203392270U (en) | 2013-07-31 | 2013-07-31 | Raw material storage tank having nitrogen sealing protection function in benzene hydrogenation device |
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| CN203392270U true CN203392270U (en) | 2014-01-15 |
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| CN201320464199.4U Expired - Fee Related CN203392270U (en) | 2013-07-31 | 2013-07-31 | Raw material storage tank having nitrogen sealing protection function in benzene hydrogenation device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104709624A (en) * | 2014-12-09 | 2015-06-17 | 莱芜钢铁集团有限公司 | Groove bottom slag flushing structure and slag flushing method of benzene hydrogenation raw material storage tank |
| CN104843357A (en) * | 2014-02-17 | 2015-08-19 | 五冶集团上海有限公司 | Tank of benzene hydrogenation engineering and manufacturing and mounting method thereof |
| CN105836332A (en) * | 2016-05-25 | 2016-08-10 | 中国石油天然气股份有限公司广西石化分公司 | Aviation kerosene storage tank capable of preventing microorganism breeding |
| CN106903481A (en) * | 2015-12-22 | 2017-06-30 | 五冶集团上海有限公司 | The method for prefabricating of large-size stainless steel groove tank base plate under hot environment |
| CN108212024A (en) * | 2017-12-25 | 2018-06-29 | 海南汉地阳光石油化工有限公司 | It is a kind of that there is the finishing reactor of lightning strike protection |
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2013
- 2013-07-31 CN CN201320464199.4U patent/CN203392270U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104843357A (en) * | 2014-02-17 | 2015-08-19 | 五冶集团上海有限公司 | Tank of benzene hydrogenation engineering and manufacturing and mounting method thereof |
| CN104843357B (en) * | 2014-02-17 | 2017-02-15 | 五冶集团上海有限公司 | Tank of benzene hydrogenation engineering and manufacturing and mounting method thereof |
| CN104709624A (en) * | 2014-12-09 | 2015-06-17 | 莱芜钢铁集团有限公司 | Groove bottom slag flushing structure and slag flushing method of benzene hydrogenation raw material storage tank |
| CN104709624B (en) * | 2014-12-09 | 2017-03-15 | 莱芜钢铁集团有限公司 | Bottom land flushing cinder structure and flushing cinder method in a kind of benzene hydrogenation raw material storage tank |
| CN106903481A (en) * | 2015-12-22 | 2017-06-30 | 五冶集团上海有限公司 | The method for prefabricating of large-size stainless steel groove tank base plate under hot environment |
| CN105836332A (en) * | 2016-05-25 | 2016-08-10 | 中国石油天然气股份有限公司广西石化分公司 | Aviation kerosene storage tank capable of preventing microorganism breeding |
| CN108212024A (en) * | 2017-12-25 | 2018-06-29 | 海南汉地阳光石油化工有限公司 | It is a kind of that there is the finishing reactor of lightning strike protection |
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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 |
Granted publication date: 20140115 Termination date: 20160731 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |