CN111806912B - Pressure stabilizing protection system of nylon 66 saline solution storage tank - Google Patents
Pressure stabilizing protection system of nylon 66 saline solution storage tank Download PDFInfo
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- CN111806912B CN111806912B CN202010716326.XA CN202010716326A CN111806912B CN 111806912 B CN111806912 B CN 111806912B CN 202010716326 A CN202010716326 A CN 202010716326A CN 111806912 B CN111806912 B CN 111806912B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
- B65D90/36—Weakened parts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
Abstract
The invention belongs to the technical field of nylon 66 salt, and particularly relates to a pressure stabilizing protection system of a nylon 66 salt water solution storage tank. The pressure stabilizing protection system of the aqueous solution storage tank comprises a first pressure stabilizing tank and a second pressure stabilizing tank, wherein the first pressure stabilizing tank and the second pressure stabilizing tank are both connected with water replenishing pipelines; an air supplementing pipeline is inserted into the first pressure stabilizing tank, a first pressure stabilizing pipeline is arranged at the top of the first pressure stabilizing tank, and a first overflow pipeline is arranged at the lower part of the first pressure stabilizing tank; and a second pressure stabilizing pipeline is inserted into the second pressure stabilizing tank, the tail end of the first pressure stabilizing pipeline is positioned on the second pressure stabilizing pipeline, and a second overflow pipeline is arranged at the lower part of the second pressure stabilizing tank. According to the invention, through the design of the first pressure stabilizing tank and the second pressure stabilizing tank, the stability of the nitrogen sealing pressure of the nylon 66 saline solution storage tank is realized, and the consumption of nitrogen is reduced.
Description
Technical Field
The invention belongs to the technical field of nylon 66 salt, and particularly relates to a pressure stabilizing protection system of a nylon 66 salt water solution storage tank.
Background
Along with the enhancement of the awareness of energy conservation and environmental protection of people, the consumption of energy in chemical production is more and more emphasized by people, and the problem that people need to solve urgently is how to save the energy and produce qualified chemical products. The nylon 66 salt is a monomer for synthesizing the nylon chain cloth, and is white or yellowish gem-shaped monoclinic crystal system crystals which are odorless, non-corrosive and slightly ammoniacal at normal temperature. Nylon 66 salt is relatively stable in dry or solution at room temperature, but when the temperature is above 200 ℃, polymerization occurs.
At present, nylon 66 salt mainly comprises two production processes of an aqueous solution method and a solvent crystallization method. The aqueous solution method is to take water as a solvent, and the water solution of nylon 66 is obtained by neutralization reaction of equivalent weight of hexamethylene diamine and adipic acid in the aqueous solution. The cost of the nylon 66 salt generated by the aqueous solution method is relatively low, the product quality is stable, and the nylon 66 salt can be transported in a short distance, so that the nylon 66 salt is dominant in the production of the nylon 66 salt, and the storage of the nylon 66 salt in the transportation is critical.
The nylon 66 salt is characterized by easy decomposition at 50 ℃, easy oxidation when contacting with air, easy degradation under the irradiation of sunlight and short storage period of less than six months. Therefore, the aqueous solution needs to be protected by nitrogen gas for storage. At present, nitrogen after pressure reduction is adopted to directly enter a storage tank and then is discharged from an exhaust port of the storage tank, micro-positive pressure in the tank is always maintained, the nitrogen is discharged, the consumption amount of the nitrogen is large, and pressure fluctuation in the tank is also large. Therefore, a pressure stabilizing protection system for a nylon 66 saline solution storage tank is needed, which can reduce the consumption of nitrogen even if the pressure in the tank can be maintained stable.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention provides a pressure stabilizing protection system of a nylon 66 saline solution storage tank. The pressure stabilizing protection system realizes the stability of the nitrogen seal pressure of the nylon 66 saline solution storage tank and reduces the consumption of nitrogen through the design of the first pressure stabilizing tank, the second pressure stabilizing tank and pipelines thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a pressure stabilizing protection system of a nylon 66 saline solution storage tank comprises a first pressure stabilizing tank and a second pressure stabilizing tank, wherein the first pressure stabilizing tank and the second pressure stabilizing tank are both connected with water replenishing pipelines;
an air supplementing pipeline is inserted into the first pressure stabilizing tank, a first pressure stabilizing pipeline is arranged at the top of the first pressure stabilizing tank, and a first overflow pipeline is arranged at the lower part of the first pressure stabilizing tank;
and a second pressure stabilizing pipeline is inserted into the second pressure stabilizing tank, the tail end of the first pressure stabilizing pipeline is positioned on the second pressure stabilizing pipeline, and a second overflow pipeline is arranged at the lower part of the second pressure stabilizing tank.
Preferably, the first overflow pipeline is connected with a pressure equalizing pipeline, and the tail end of the pressure equalizing pipeline is connected with a first pressure stabilizing pipeline; an exhaust pipeline is arranged on the second overflow pipeline.
Preferably, the first overflow pipeline is provided with a point E, a point F, a point G, a point H and a point K in sequence from the starting end to the tail end; the point F and the point H are the same in vertical height, the vertical height of the point E is lower than that of the point F, and the point F and the point H are the highest points of the first overflow pipeline; the vertical height between the point G and the point K is greater than the height of the second pressure stabilizing pipeline below the liquid level.
Further preferably, the vertical height between the point K and the point G (i.e. the liquid seal pressure between the point F and the point K of the first overflow pipeline on the first pressure stabilizing pipe) is greater than the height of the second pressure stabilizing pipeline below the liquid level; the vertical height between the point K and the point G is defined as Z, the height of the second pressure stabilizing pipeline below the liquid level is defined as X, and the height of the air supplementing pipeline below the liquid level is defined as Y; in particular, the value of Z is greater than X.
The air supply pipeline of the invention normally delivers 0.4 MPa of nitrogen, and the pressure reducing valve is set to be (X + Y) mmH2O。
Further preferably, the starting end of the pressure equalizing pipeline is arranged at a point F on the first overflow pipeline.
Preferably, the second overflow pipeline is sequentially provided with a point A, a point B and a point C from the starting end to the tail end, the vertical height of the point A is lower than that of the point B, and the point B is the highest point of the second overflow pipeline.
Further preferably, the beginning of the exhaust line is located at point B on the second overflow line.
Preferably, the upper end of the second pressure stabilizing pipeline is connected with the nitrogen seal connecting pipeline.
Preferably, the air supply pipeline is provided with a pressure reducing valve and a pressure gauge.
Preferably, valves are arranged on the air supply pipeline and the water supply pipeline.
Compared with the prior art, the invention has the beneficial effects that:
1. the pressure stabilizing protection system realizes the stability of the nitrogen sealing pressure of the nylon 66 saline solution storage tank and reduces the consumption of nitrogen by the design of the first pressure stabilizing tank, the second pressure stabilizing tank and the connecting pipeline thereof;
2. z needs to be larger than X, and the pressure reducing valve is set to (X + Y) mmH2O, the stability of a voltage stabilizing system can be ensured;
3. an exhaust pipeline is arranged at the point B at the highest point of the second overflow pipe and is connected with the atmosphere, so that the siphon phenomenon is prevented;
4. the design of the pressure equalizing pipeline ensures that the pressure at the F point is consistent with the pressure in the pressure equalizing pipeline and the first pressure stabilizing tank to be X mmH2O。
Drawings
FIG. 1 is a schematic structural diagram of a pressure stabilizing protection system of a nylon 66 saline solution storage tank according to the present invention;
in the figure: 1 is first surge tank, 2 is the second surge tank, 3 is second overflow pipeline, 4 is the exhaust pipe, 5 is the second surge pipeline, 6 is first surge pipeline, 7 is first overflow pipeline, 8 is the pressure-equalizing pipeline, 9 is the moisturizing pipeline, 10 is the relief pressure valve, 11 is the moisturizing pipeline, 12 is the manometer, 13 is nitrogen seal connecting line, 14 is the nitrogen gas storage tank, 15 is the water storage tank.
Detailed Description
The invention is further illustrated, but not limited, by the following examples and the accompanying drawings.
In the description of the present invention, it should be noted that, for the orientation words, such as the terms "height", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific scope of the present invention.
It is noted that the terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used.
Example 1
As shown in fig. 1, the pressure stabilizing protection system for a nylon 66 saline solution storage tank of the present invention comprises a first pressure stabilizing tank 1 and a second pressure stabilizing tank 2, wherein the first pressure stabilizing tank 1 and the second pressure stabilizing tank 2 are both connected with a water replenishing pipeline 11; an air supplementing pipeline 9 is inserted into the first pressure stabilizing tank 1, the tail end of the air supplementing pipeline 9 is an L point, a first pressure stabilizing pipeline 6 is arranged at the top of the first pressure stabilizing tank 1, and a first overflow pipeline 7 is arranged at the lower part of the first pressure stabilizing tank 1. The first overflow pipeline 7 is provided with a point E, a point F, a point G, a point H and a point K in sequence from the starting end to the tail end; the point F and the point H are at the same vertical height, and the point F and the point H are the highest point of the first overflow pipeline; the vertical height of point E is lower than point F. The first overflow pipeline 7 is connected with a pressure equalizing pipeline 8, the starting end of the pressure equalizing pipeline 8 is arranged at a point F on the first overflow pipeline 7, and the tail end of the pressure equalizing pipeline 8 is connected with the first pressure stabilizing pipeline 6.
The second pressure stabilizing tank 2 is internally inserted with a second pressure stabilizing pipeline 5, the tail end of the first pressure stabilizing pipeline 6 is positioned on the second pressure stabilizing pipeline 5, and the upper end of the second pressure stabilizing pipeline 5 is connected with a nitrogen seal connecting pipeline 13. The lower part of the second surge tank 2 is provided with a second overflow pipeline 3, the second overflow pipeline 3 is sequentially provided with a point A, a point B and a point C from the starting end to the tail end, the vertical height of the point A is lower than that of the point B, the point B is the highest point of the second overflow pipeline 3, the second overflow pipeline 3 is provided with an exhaust pipeline 4 connected with the atmosphere, and the starting end of the exhaust pipeline 4 is arranged at the point B on the second overflow pipeline 3.
The end of the nitrogen seal connecting pipeline 13 is connected with a device or equipment needing nitrogen seal.
The water supplementing pipeline 11 is divided into two branches, one branch is connected with the top of the first pressure stabilizing tube 1, the other branch is connected with the top of the second pressure stabilizing tube 2, and valves are arranged on the two branches.
A pressure reducing valve 10 and a pressure gauge 12 are arranged on the air supplementing pipeline 9, a valve is arranged on the air supplementing pipeline 9 between the nitrogen storage tank 14 and the pressure reducing valve 10, and a valve is arranged on the air supplementing pipeline 9 between the pressure gauge 12 and the first pressure stabilizing tank 1.
The water replenishing pipe 11 is connected at its leading end to the water tank 15, and the gas replenishing pipe 9 is connected at its leading end to the nitrogen tank 14.
Water receiving grooves (not shown in the figure) are arranged below the points C and K to guide the water overflowed from the first overflow pipeline and the second overflow pipeline to the trench.
Specifically, the gas supply line 9 of the present invention normally supplies nitrogen gas at 0.4 MPa (the pressure of nitrogen gas from the nitrogen gas tank 14 is 0.4 MPa).
The vertical height between the point K and the point G is defined as Z, the height of the second pressure stabilizing pipeline 5 below the liquid level in the second pressure stabilizing tank 2 is defined as X (the bottom end of the second pressure stabilizing pipeline 5 is defined as the point D, namely the vertical distance between the point D and the liquid level is X), and the gas supplementing pipelineThe height of the gas supplementing pipeline 9 below the liquid level in the first pressure stabilizing tank 1 is defined as Y (the tail end of the gas supplementing pipeline 9 is defined as an L point, namely the vertical distance between the L point and the liquid level is Y), and Z is required to be larger than X, so that the nitrogen-sealed pressure is ensured not to be discharged from a K point at the tail end of the first overflow pipeline 7; the pressure reducing valve is set to (X + Y) mmH2O, when the nitrogen sealing pressure is lower than X mmH2And when O is generated, the nitrogen breaks through the water seal of the first pressure stabilizing tank 1 through the pressure reducing valve 10 and enters the tank.
The first overflow pipeline 7 is provided with a pressure equalizing pipeline 8 at the F point and is connected with the first pressure stabilizing pipeline 6, and the design of the pressure equalizing pipeline 8 ensures that the pressure at the F point is consistent with the pressure in the pressure equalizing pipeline 8 and the pressure in the first pressure stabilizing tank 1 and is X mmH2And O. According to the principle of a communicating vessel, the height of the liquid level of the first pressure stabilizing tank 1 is consistent with the height of the F point.
The second overflow pipeline 3 is provided with an exhaust pipeline 4 at the point B, the arrangement of the exhaust pipeline 4 avoids the siphon phenomenon possibly generated by the second overflow pipeline 3, and according to the principle of a communicating vessel, the height of the liquid in the second pressure stabilizing tank 2 is consistent with the height of the point B. When the nitrogen sealing pressure (the pressure of the second pressure stabilizing pipeline 5, the first pressure stabilizing pipeline 6 and the connected equipment needing nitrogen sealing, hereinafter referred to as nitrogen sealing pressure) is X mmH2When the pressure is O, the gas in the second pressure stabilizing pipeline 5 breaks through the water seal pressure of the second pressure stabilizing tank 2 and is discharged from the exhaust pipeline at the top of the second pressure stabilizing tank 2, so that the nitrogen seal pressure is X mmH2O。
Before the water replenishing device is used, the valve on the water replenishing pipeline 11 is opened to replenish water to the first pressure stabilizing tank 1 and the second pressure stabilizing tank 2, water flows out from the point C of the second overflow pipeline 3 and the point K of the first overflow pipeline 7, and the valve on the water replenishing pipeline 11 is closed after the water flows out. When the liquid level of the second pressure stabilizing tank 2 is reduced to be consistent with the height of the B point, the liquid level is not reduced, when the liquid level of the first pressure stabilizing tank 1 is reduced to be consistent with the height of the F point, the liquid level is not reduced, and the liquid level is stable. At this time, the pressure of the nitrogen seal system (i.e., nitrogen seal pressure) is X mmH2O, the pressure reducing valve 10 of the gas supply line 9 is set to (X + Y) mmH2O, when the nitrogen seal pressure is lower than the pressure (X + Y) mmH of the pressure reducing valve 102And when the nitrogen is in the O state, the nitrogen breaks through the water seal of the first pressure stabilizing tank 1 through the pressure reducing valve 10 to supplement the nitrogen to the nitrogen sealing system. When the nitrogen seal pressure is higher than the water seal pressure X mmH of the second pressure stabilizing tank 22When O is generated, nitrogen willAnd breaking through the water seal of the second pressure stabilizing tank 2 and discharging the water from the tank top exhaust pipeline 4 to the system, and keeping the nitrogen seal pressure stable. The design of the pressure stabilizing protection system ensures that the pressure of equipment needing nitrogen sealing is maintained at X mmH2The stable value of O can automatically exhaust or supplement gas only when the liquid level of the equipment needing nitrogen sealing rises and falls, so that the consumption of nitrogen is low. Since the first surge tank 1 and the second surge tank 2 perform the water replenishing operation once a week, the water consumption amount is also low.
The principle of the invention is briefly described as follows:
from the second surge tank 2, when the nitrogen-sealed pressure is X mmH2When O is detected, the length of the gas supply line 9 extending below the liquid level is Ymm, and the pressure of the pressure reducing valve 10 is set to (X + Y) mmH2And O. When the nitrogen sealing pressure is less than X mmH2And when O is generated, the nitrogen pressure breaks through the water seal and enters equipment or a device needing the nitrogen seal.
When the nitrogen seal pressure is larger than X mmH2At O, the gas in the second surge tank 5 will break through the water seal pressure of the second surge tank 2 and be discharged from the exhaust pipe (not labeled in the figure) of the second surge tank 2.
The depth X mm of the second pressure stabilizing pipeline 5 extending below the liquid level is determined, namely the pressure of the nitrogen seal is XmmH2O。
When the liquid level in the second pressure stabilizing tank 2 is higher than the point B, the liquid overflows, so that the liquid level is the height of the highest point B of the second overflow pipeline 3, and the stability of the liquid level in the tank is ensured. An exhaust pipeline 4 is arranged at the point B at the highest point of the second overflow pipe 3 and is connected with the atmosphere, so that the siphon phenomenon is prevented. The point A at the starting end of the second overflow pipe 3 may be lower than the point B of the liquid level in the tank.
Because of the siphon action of the first overflow pipe 7, the liquid height from the point F to the point G can be lowered to the horizontal position of the point K, and because of the pressure action at the point F, the liquid height from the point F to the point G can be further lowered by X mm, so that the vertical distance Z mm from the lowest point G of the overflow pipe to the point K at the tail end needs to be greater than the pressure height X mm of nitrogen seal, and gas can not break through the water seal at the overflow pipe.
Before the pressure stabilizing protection system is put into use, the nitrogen consumption for producing 10 ten thousand tons of nylon 66 salt in a year is 220 Nm/h, after the pressure stabilizing protection system is put into use, under the same productivity, the nitrogen consumption is 130 Nm/h, the nitrogen consumption is reduced by about 90 Nm/h, the nitrogen consumption is reduced by 41 percent, and the use of nitrogen is greatly reduced.
Claims (7)
1. A pressure stabilizing protection system of a nylon 66 saline solution storage tank is characterized by comprising a first pressure stabilizing tank and a second pressure stabilizing tank, wherein the first pressure stabilizing tank and the second pressure stabilizing tank are both connected with water replenishing pipelines;
an air supplementing pipeline is inserted into the first pressure stabilizing tank, a first pressure stabilizing pipeline is arranged at the top of the first pressure stabilizing tank, and a first overflow pipeline is arranged at the lower part of the first pressure stabilizing tank;
a second pressure stabilizing pipeline is inserted into the second pressure stabilizing tank, the tail end of the first pressure stabilizing pipeline is positioned on the second pressure stabilizing pipeline, a second overflow pipeline is arranged at the lower part of the second pressure stabilizing tank, a pressure equalizing pipeline is connected onto the first overflow pipeline, and the tail end of the pressure equalizing pipeline is connected with the first pressure stabilizing pipeline; an exhaust pipeline is arranged on the second overflow pipeline, and a point E, a point F, a point G, a point H and a point K are sequentially arranged on the first overflow pipeline from the starting end to the tail end; the point F and the point H are the same in vertical height, the vertical height of the point E is lower than that of the point F, and the point F and the point H are the highest points of the first overflow pipeline; the vertical height between the point G and the point K is larger than the height of the second pressure stabilizing pipeline below the liquid level, the second overflow pipeline is sequentially provided with a point A, a point B and a point C from the starting end to the tail end, the vertical height of the point A is lower than that of the point B, and the point B is the highest point of the second overflow pipeline.
2. The pressure stabilizing protection system for a nylon 66 saline solution storage tank as claimed in claim 1, wherein the vertical height between the point K and the point G is greater than the height of the second pressure stabilizing pipeline below the liquid level.
3. The pressure stabilizing protection system for a nylon 66 saline solution storage tank as claimed in claim 1, wherein the beginning end of the pressure equalizing pipeline is arranged at a point F on the first overflow pipeline.
4. The pressure stabilizing protection system for a nylon 66 saline solution storage tank as claimed in claim 1, wherein the beginning end of the exhaust pipeline is arranged at a point B on the second overflow pipeline.
5. The pressure stabilizing protection system for a nylon 66 saline solution storage tank as claimed in claim 1, wherein the upper end of the second pressure stabilizing pipeline is connected with a nitrogen seal connecting pipeline.
6. The pressure stabilizing protection system for nylon 66 saline solution storage tank as claimed in claim 1, wherein a pressure reducing valve and a pressure gauge are arranged on the air supply pipeline.
7. The system of claim 1, wherein valves are disposed on the air supply line and the water supply line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010716326.XA CN111806912B (en) | 2020-07-23 | 2020-07-23 | Pressure stabilizing protection system of nylon 66 saline solution storage tank |
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| CN202010716326.XA CN111806912B (en) | 2020-07-23 | 2020-07-23 | Pressure stabilizing protection system of nylon 66 saline solution storage tank |
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| CN111806912B true CN111806912B (en) | 2022-04-22 |
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| CN202203454U (en) * | 2011-06-02 | 2012-04-25 | 广州科城环保科技有限公司 | Positive and negative pressure water seal safety system for isolating waste gas |
| CN206958321U (en) * | 2017-07-28 | 2018-02-02 | 山东世纪阳光科技有限公司 | A kind of pigment tank field prevents the positive/negative-pressure water seal arrangement that volatilizees |
| CN210479706U (en) * | 2019-08-29 | 2020-05-08 | 福建省天骄化学材料有限公司 | Water seal arrangement of acrylonitrile storage tank |
| CN212387024U (en) * | 2020-07-23 | 2021-01-22 | 河南神马尼龙化工有限责任公司 | Pressure stabilizing protection system of nylon 66 saline solution storage tank |
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