CN115991391A - Overpressure environment-friendly protection method for powder tank - Google Patents
Overpressure environment-friendly protection method for powder tank Download PDFInfo
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- CN115991391A CN115991391A CN202310116223.3A CN202310116223A CN115991391A CN 115991391 A CN115991391 A CN 115991391A CN 202310116223 A CN202310116223 A CN 202310116223A CN 115991391 A CN115991391 A CN 115991391A
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Abstract
The invention discloses an overpressure environment-friendly protection method for a powder tank, which comprises the following steps: s1, setting the lifting pressure of a powder tank pressure safety valve to be smaller than or equal to the lifting pressure of a gas transmission pressure safety valve; s2, closing a discharge valve, a feed valve and an emptying valve, and opening an air inlet valve; s3, pre-pressurizing the powder tank from an air inlet of the powder tank through the air pipe; s4, after the powder tank is pre-pressurized to the specified pressure, the discharging valve is opened, powder in the powder tank is conveyed out from the discharging pipe through the discharging valve, and when the powder tank is over-pressurized due to abnormality on the discharging pipe, the gas transmission pressure safety valve on the gas transmission pipe and the powder tank pressure safety valve on the powder tank flow due to the pressure difference, and the gas transmission pressure safety valve is started to jump and reduce the pressure at first. When the air pressure difference exists between the air pipe and the powder tank, the air pressure safety valve arranged on the air pipe reaches the take-off pressure earlier than the pressure safety valve of the powder tank, so that the powder in the powder tank is prevented from leaking.
Description
Technical Field
The invention belongs to the technical field of overpressure protection of powder tanks, and particularly relates to an overpressure environment-friendly protection method of a powder tank.
Background
The drilling machine powder conveying system of the ocean platform is a system for providing drilling mud materials and cement powder for well cementation for an offshore drilling machine, and the conveying system mainly adopts dried compressed air as power to carry out closed conveying of pipeline powder. The powder tank can be used as a receiving tank or a transmitting tank in the powder conveying system, and in the process of receiving powder by the receiving tank, the air for conveying the powder is continuously discharged through the air discharging pipe by the air discharging port on the powder tank, so that the overpressure of the tank body can hardly occur under the working condition. The powder tank body overpressure mainly occurs in the working condition that the tank body is used as a sending tank to carry out powder to the outside, because the working condition is that compressed air is used for pre-pressurizing the tank body and simultaneously fluidizing the powder in the tank body, the pre-pressurizing is carried out the powder through a discharging pipeline to a certain pressure, at the moment, if unexpected conditions such as damage of a discharging valve or blockage of the discharging pipeline occur on the discharging pipeline, the powder tank overpressure can be caused, a safety valve on the powder tank can be opened after a certain pressure value is reached, the powder in the powder tank is sprayed out along with the compressed air through the safety valve, the surrounding environment is polluted, and even dangerous accidents such as dust explosion are caused.
Disclosure of Invention
In order to solve at least one of the technical problems, the invention provides an overpressure environment-friendly protection method for a powder tank.
The aim of the invention is achieved by the following technical scheme:
the invention provides a powder tank overpressure environment-friendly protection method, which comprises a compressed air unit and a powder tank, wherein a feed inlet connected with a feed pipe, a discharge outlet connected with a discharge pipe, a vent connected with a blow-down pipe, an air inlet connected with an air delivery pipe of the compressed air unit and a discharge outlet provided with a powder tank pressure safety valve are respectively arranged on the powder tank, the feed pipe is provided with the feed valve, the discharge pipe is provided with the discharge valve, the blow-down pipe is provided with the vent valve, the air delivery pipe is provided with the air delivery pressure safety valve, and an air inlet valve is arranged on the air delivery pipe between the air delivery pressure safety valve and the air inlet, and the overpressure environment-friendly protection method comprises the following steps:
s1, setting the take-off pressure of a powder tank pressure safety valve and a gas transmission pressure safety valve, so that the take-off pressure of the gas transmission pressure safety valve is smaller than or equal to the take-off pressure of the powder tank pressure safety valve;
s2, closing a discharge valve, a feed valve and an emptying valve, and simultaneously opening an air inlet valve;
s3, pre-pressurizing the powder tank from an air inlet of the powder tank through an air pipe of the compressed air unit to fluidize the powder in the powder tank;
s4, after the powder tank is pre-pressurized to the specified pressure, the discharging valve is opened, powder in the powder tank is conveyed out from the discharging pipe through the discharging valve, and when the powder tank is over-pressurized due to abnormality on the discharging pipe, the gas transmission pressure safety valve on the gas transmission pipe and the powder tank pressure safety valve on the powder tank flow due to pressure difference, and the gas transmission pressure safety valve reaches the take-off pressure before the powder tank pressure safety valve so as to take-off and reduce the pressure.
As a further improvement, the compressed air unit comprises a gas pipe, an air compressor for generating compressed air, a gas storage tank for storing the compressed air, a filter for filtering impurities in the compressed air, and a compressed air dryer for enabling the dew point of water in the compressed air to be lower than 29 degrees below zero.
As a further improvement, the powder conveying system comprises a blowing-assisting pipeline with two ends respectively arranged on the air inlet pipe and the discharging pipe.
The invention provides a powder tank overpressure environment-friendly protection method, which comprises a compressed air unit and a powder tank, wherein a feed inlet connected with a feed pipe, a discharge outlet connected with a discharge pipe, an emptying port connected with an emptying pipe, an air inlet connected with an air delivery pipe of the compressed air unit and a discharge port provided with a powder tank pressure safety valve are respectively arranged on the powder tank, the feed pipe is provided with the feed valve, the discharge pipe is provided with the discharge valve, the emptying pipe is provided with the emptying valve, the air delivery pipe is provided with the air delivery pressure safety valve, and an air inlet valve is arranged on the air delivery pipe between the air delivery pressure safety valve and the air inlet, and the overpressure environment-friendly protection method comprises the following steps: s1, setting the take-off pressure of a powder tank pressure safety valve and a gas transmission pressure safety valve, so that the take-off pressure of the gas transmission pressure safety valve is smaller than or equal to the take-off pressure of the powder tank pressure safety valve; s2, closing a discharge valve, a feed valve and an emptying valve, and simultaneously opening an air inlet valve; s3, pre-pressurizing the powder tank from an air inlet of the powder tank through an air pipe of the compressed air unit to fluidize the powder in the powder tank; s4, after the powder tank is pre-pressurized to the specified pressure, the discharging valve is opened, powder in the powder tank is conveyed out from the discharging pipe through the discharging valve, and when the powder tank is over-pressurized due to abnormality on the discharging pipe, the gas transmission pressure safety valve on the gas transmission pipe and the powder tank pressure safety valve on the powder tank flow due to pressure difference, and the gas transmission pressure safety valve reaches the take-off pressure before the powder tank pressure safety valve so as to take-off and reduce the pressure. According to the invention, the gas transmission pressure safety valve and the powder tank pressure safety valve are respectively arranged on the gas transmission pipe and the powder tank, when the gas pressure difference exists between the two environments, gas flows to a place with relatively low gas pressure, and because the gas transmission pressure safety valve is arranged on the gas transmission pipe and is positioned at the upstream of the powder tank, the gas transmission pressure safety valve is closer to a pressure source of the compressed air unit than the powder tank pressure safety valve, and under the condition of overpressure of the powder tank, the pressure safety valve arranged on the gas transmission pipe can jump up before the pressure safety valve arranged on the powder tank, so that the gas transmission pipe and the powder tank can be depressurized, and the dust in the powder tank is prevented from being sprayed out from the powder tank pressure safety valve to pollute the environment and dangerous accidents caused by explosion because the pressure safety valve arranged on the gas transmission pressure safety valve is smaller than or equal to the pressure safety valve arranged on the powder tank.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a schematic flow chart of the overpressure environmental protection method of the present invention;
FIG. 2 is a numerical control schematic of the powder delivery system of the present invention.
Detailed Description
In order to better understand the technical solutions of the present invention, the following description will be made in detail with reference to the accompanying drawings and specific embodiments, and it should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
Referring to fig. 1, the embodiment of the invention provides an overpressure environment-friendly protection method for a powder tank, wherein a powder conveying system comprises a compressed air unit and the powder tank 1, the powder tank 1 is respectively provided with a feed inlet connected with a feed pipe 3, a discharge outlet connected with a discharge pipe 4, a vent connected with a vent pipe 5, an air inlet connected with an air pipe 2 of the compressed air unit and a vent provided with a powder tank pressure safety valve 11 (Pressure Safety Valve, PSV), the feed pipe 3 is provided with a feed valve 31, the discharge pipe 4 is provided with a discharge valve 41, the vent pipe 5 is provided with a vent valve 51, the air pipe 2 is provided with an air pressure safety valve 22, and the air pipe 2 between the air pressure safety valve 22 and the air inlet is provided with an air inlet valve 21. The take-off pressure of the PSV pressure relief valve is set according to the working pressures of the powder tank 1 and the gas pipe 2, and when the pressure reaches the set point, the pressure relief valve is fully opened, and once the pressure is released by the powder tank 1 and the gas pipe 2, they are closed and continue to work. The feed inlet receives powder conveyed from a support ship and other powder tanks through a feed pipe 3; the air inlet is an interface for using dry compressed air when powder is sent outwards through the air pipe 2, and is also a main power source when the powder is sent outwards; the vent port discharges the gas from powder conveying and feeding when the powder tank 1 receives powder through the vent pipe 5 so as to maintain the micro-positive pressure design of the tank body under the working condition; the discharge port transmits powder outwards through a discharge pipe 4; the relief valve relief port is primarily used for overpressure protection of the tank. The compressed air unit comprises a gas pipe, an air compressor for generating compressed air, a gas storage tank for storing the compressed air, a filter for filtering impurities in the compressed air and a compressed air dryer for enabling the dew point of water in the compressed air to be lower than 29 ℃ below zero. A compressor: air under the atmospheric pressure is compressed and is delivered to the air storage tank at a higher pressure; an air storage tank: storing the compressed air, settling impurities in the air in a tank, separating most of water, oil and dust, and discharging; and (3) a filter: the number of the filters and the position of the compressed air unit are different according to the air quality requirement, and the basic configuration is that the filtering precision is 3 mu m, 1 mu m and 0.01 mu m; and (3) a dryer: the dryer can be used for absorbing and treating the moisture in the compressed air, so that the dew point of the water in the compressed air can meet the use requirement, and the dryer can be selected as a non-heat regeneration dryer, a micro-heat regeneration dryer and the like according to classification.
Taking the powder tank 1 as a sending tank as an example, the overpressure environment-friendly protection method comprises the following steps:
s1, setting the take-off pressure of the powder tank pressure safety valve 11 and the gas transmission pressure safety valve 22, so that the take-off pressure of the gas transmission pressure safety valve 22 is smaller than or equal to the take-off pressure of the powder tank pressure safety valve 11, and setting the actual take-off pressures of the powder tank pressure safety valve 11 and the gas transmission pressure safety valve 22 according to production requirements, such as setting the take-off pressure of the powder tank pressure safety valve 11 to 630kPaG and setting the take-off pressure of the gas transmission pressure safety valve 22 to 650kPaG. In the present embodiment, the take-off pressure of the powder tank pressure relief valve 11 is set to 650kPaG and the take-off pressure of the gas delivery pressure relief valve 22 is set to 650kPaG.
S2, closing the discharge valve 41, the feed valve and the discharge valve 51, and simultaneously opening the air inlet valve 21 so as to pre-charge the powder tank 1;
s3, pre-pressurizing the powder tank 1 from an air inlet of the powder tank 1 through an air pipe 2 of the compressed air unit to fluidize the powder in the powder tank 1;
s4, after the powder tank 1 is pre-pressurized to a specified pressure (the pre-pressurized specified pressure is generally 250-450kPaG in actual production, the pre-pressurized pressure of the powder tank 1 is regulated according to the combination of the powder in the powder tank 1 and the actual situation), the discharging valve 41 is opened so that the discharging pipe 4 communicated with the powder tank 1 starts discharging, the powder in the powder tank 1 is conveyed out from the discharging pipe through the discharging valve 41, and when the discharging pipe 4 is abnormal to cause the overpressure of the powder tank 1, the reason for the abnormality may be: the discharge valve 41 is damaged or the discharge pipe 4 is blocked, at this time, because the gas delivery pressure relief valve 22 on the gas delivery pipe 2 and the powder tank pressure relief valve 11 on the powder tank 1 flow due to the pressure difference, when there is a pressure difference between the two environments, the gas will flow to a place with a relatively low gas pressure, because the gas delivery pressure relief valve 22 is installed on the gas delivery pipe 2 and is located at the upstream of the powder tank 1, the gas delivery pressure relief valve 22 is closer to the pressure source of the compressed air unit than the powder tank pressure relief valve 11, in this embodiment, under the condition that the jump pressures set by the gas delivery pressure relief valve 22 and the powder tank pressure relief valve 11 are the same, the gas delivery pressure relief valve 22 of the gas delivery pipe 2 will reach the jump pressure earlier than the powder tank pressure relief valve 11, so that the gas delivery pipe 2 and the powder tank 1 will be depressurized, thereby avoiding the dust in the powder tank pressure relief valve 11 from spraying out of the powder tank pressure relief valve 11 to pollute the environment, and the dangerous accident due to the explosion.
As a further preferred embodiment, the powder conveying system comprises a blowing assisting pipeline 6 with two ends respectively arranged on the gas conveying pipe 2 and the discharging pipe 4, compressed air generated by a compressed air unit on the gas conveying pipe 2 is used as a pressure source, and when the powder is discharged on the discharging pipe 4, the powder in the discharging pipe 4 is discharged more smoothly and faster through the blowing assisting pipeline.
The embodiment of the invention also provides a powder conveying system, which comprises any one of the further preferable implementation modes of the powder tank overpressure environment-friendly protection method, wherein the powder tank 1 is selected from a cement powder tank, a barite powder tank and a soil powder tank, but is not limited to the cement powder tank, the barite powder tank and the soil powder tank, and can be selected according to production requirements and can be combined in various types. It should be noted that, without conflict, the powder delivery system includes a combination of further preferred embodiments, which should have the same or corresponding benefits of a powder tank overpressure environmental protection method.
In the description above, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore should not be construed as limiting the scope of the present invention.
In summary, while the above-described preferred embodiments have been described, it should be noted that although various changes and modifications can be made by those skilled in the art, it is intended that such changes and modifications be included within the scope of the present invention unless they depart from the scope of the present invention.
Claims (3)
1. The utility model provides a powder jar superpressure environmental protection method, its characterized in that includes compressed air unit, powder jar (1), gas-supply pipe (2), inlet pipe (3) and discharging pipe (4) in the powder conveying system, be equipped with feed inlet, the discharge gate of being connected with inlet pipe (3), the discharge gate of being connected with discharging pipe (4), the discharge gate of being connected with blow-down pipe (5), the air inlet of being connected with gas-supply pipe (2) of compressed air unit and install the discharge gate of powder jar pressure relief valve (11) on powder conveying system, be equipped with feed valve (31) on inlet pipe (3), be equipped with discharge valve (41) on discharging pipe (4), be equipped with blow-down valve (51) on blow-down pipe (5), be equipped with gas-supply pressure relief valve (22) on gas-supply pipe (2) between gas-supply pressure relief valve (22) and the air inlet, the environmental protection method includes following steps:
s1, setting the take-off pressure of a powder tank pressure safety valve (11) and a gas transmission pressure safety valve (22), so that the take-off pressure of the gas transmission pressure safety valve (22) is smaller than or equal to the take-off pressure of the powder tank pressure safety valve (11);
s2, closing a discharge valve (41), a feed valve (31) and a blow-off valve (51), and opening an air inlet valve (21);
s3, pre-pressurizing the powder tank (1) from an air inlet of the powder tank (1) through an air pipe (2) of the compressed air unit to fluidize the powder in the powder tank (1);
s4, after the powder tank (1) is pre-pressurized to a specified pressure, a discharge valve (41) is opened, powder in the powder tank (1) is conveyed out from a discharge pipe through the discharge valve (41), when the discharge pipe (4) is abnormally blocked to cause the overpressure of the powder tank (1), a gas conveying pressure safety valve (22) on a gas conveying pipe (2) and a powder tank pressure safety valve (11) on the powder tank (1) flow due to pressure difference, and the gas conveying pressure safety valve (22) reaches the jump pressure at first than the powder tank pressure safety valve (11) to realize jump pressure reduction.
2. The powder tank overpressure environmental protection method as set forth in claim 1, wherein said compressed air unit comprises a gas pipe, an air compressor for generating compressed air, a gas storage tank for storing compressed air, a filter for filtering impurities in the compressed air, and a compressed air dryer for making the dew point of the compressed air lower than-29 degrees.
3. The overpressure environment-friendly protection method for the powder tank according to claim 1, wherein the powder conveying system comprises a blowing-assisting pipeline (6) with two ends respectively arranged on the air inlet pipe (2) and the discharging pipe (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310116223.3A CN115991391A (en) | 2023-02-15 | 2023-02-15 | Overpressure environment-friendly protection method for powder tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310116223.3A CN115991391A (en) | 2023-02-15 | 2023-02-15 | Overpressure environment-friendly protection method for powder tank |
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| Publication Number | Publication Date |
|---|---|
| CN115991391A true CN115991391A (en) | 2023-04-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310116223.3A Pending CN115991391A (en) | 2023-02-15 | 2023-02-15 | Overpressure environment-friendly protection method for powder tank |
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| CN (1) | CN115991391A (en) |
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- 2023-02-15 CN CN202310116223.3A patent/CN115991391A/en active Pending
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