CN110566815B - System for unloading tank car light oil by using rotary piston pump and operation method thereof - Google Patents
System for unloading tank car light oil by using rotary piston pump and operation method thereof Download PDFInfo
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- CN110566815B CN110566815B CN201810571389.3A CN201810571389A CN110566815B CN 110566815 B CN110566815 B CN 110566815B CN 201810571389 A CN201810571389 A CN 201810571389A CN 110566815 B CN110566815 B CN 110566815B
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- unloading
- gas
- rotary piston
- oil
- piston pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Abstract
The invention provides a system for unloading tank car light oil by using a rotary piston pump and an operation method thereof. The system and the operation method can effectively prevent the phenomenon that the bin cannot be swept, the frequency conversion controller can obviously reduce the frequency of the rotary piston pump to solve the problem of cavitation, and the arrangement of the oil supplementing pipe of the rotary piston pump can solve the problems of overlarge pump vibration, high noise intensity and easiness in damage of the pump.
Description
Technical Field
The invention relates to the technical field of unloading oil products transported by a train tank car by a displacement pump, in particular to a system for unloading light oil of the tank car by using a rotary piston pump and an operation method thereof.
Background
The positive displacement oil pump has strong self-absorption capacity, for example, a rotary piston pump can directly pump oil from a train tank car without oil guiding and pump filling, so the positive displacement oil pump is widely applied to tank car oil unloading in recent years. Meanwhile, because the displacement pump adopts negative pressure oil discharge, the problems of air resistance and cavitation are not fundamentally solved, and therefore, the following problems are easily caused if the process method is improper in high-temperature and low-pressure areas: (1) the bin sweeping efficiency is extremely low, and even the situation that the bin cannot be swept occurs; (2) the gas-liquid mixed transmission ratio is too large, the working range of the rotary piston pump is exceeded, the oil pipeline and the rotary piston pump vibrate violently, the field noise intensity is high, and the pump is easy to damage; (3) the gas-liquid mixed transportation ratio is too large, and the floating plate in the storage tank is easy to turn over, so that major accidents are caused.
Disclosure of Invention
The system is reasonable in structural design, the phenomenon that a bin cannot be swept is prevented, the frequency conversion controller arranged can obviously reduce the frequency of the rotary piston pump to solve the cavitation problem, and the arrangement of the oil supplementing pipe of the rotary piston pump can effectively prevent the problems that the pump vibration is too large, the noise intensity is high and the pump is easy to damage due to the fact that the gas-liquid mixed delivery ratio is too high.
In order to solve the problems, the technical measures adopted by the invention are as follows:
a system for unloading tank car light oil by using a rotary piston pump comprises an unloading oil filling pipe, the rotary piston pump, a gas-liquid separation tank, a centrifugal pump and a control system, wherein an unloading oil suction pipe and a bin sweeping oil suction pipe are vertically arranged in the unloading oil filling pipe of a sleeve type structure, a liquid level probe is fixedly arranged at the bottom of the unloading oil suction pipe, the unloading oil suction pipe and the bin sweeping oil suction pipe are respectively connected with an unloading pipeline and a bin sweeping pipeline, the unloading oil suction pipe and the bin sweeping oil suction pipe are communicated with an oil conveying pipeline after being converged and are connected to a filter inlet, a filter outlet pipeline is connected with the inlet of the rotary piston pump, the outlet pipeline of the rotary piston pump is connected with the gas-liquid separation tank, a discharge pipeline of the gas-liquid separation tank is connected with the inlet of the centrifugal pump, and the rotary piston pump and the centrifugal pump are respectively connected to the control system through a variable frequency, the outlet pipeline of the centrifugal pump is divided into two branches, wherein one branch is connected to the storage tank through an oil pipeline, and the other branch is used as an oil supplementing pipe of the rotary piston pump and is communicated with the inlet pipeline of the rotary piston pump.
Particularly, the unloading pipeline and the bin sweeping pipeline are respectively provided with an unloading electric valve and a bin sweeping electric valve.
Particularly, the top of the gas-liquid separation tank is also provided with a gas pipeline, the gas pipeline is provided with an exhaust valve, and exhausted gas enters a gas pipeline network system or oil-gas recovery equipment.
Particularly, the liquid level probe is of a two-section structure, and the liquid level probe transmits a liquid level signal to the control system.
In particular, a centrifugal pump inlet valve is also provided on the inlet line of the centrifugal pump.
Particularly, a rotary piston pump oil supplementing pipe valve is arranged on the rotary piston pump oil supplementing pipe, and a storage tank feeding valve is arranged on an oil conveying pipeline connected with the storage tank.
Particularly, an inlet valve of the gas-liquid separation tank is arranged on an inlet pipeline of the gas-liquid separation tank.
A system operation method for unloading tank car light oil by adopting a rotary piston pump comprises the following operation steps:
firstly, closing an electric valve of a bin sweeping line, opening an electric valve of an unloading line, an inlet valve of a gas-liquid separation tank, an inlet valve of a centrifugal pump, a feeding valve of a storage tank and an exhaust valve of the gas-liquid separation tank, and starting a rotary piston pump and the centrifugal pump in sequence to unload the tank car;
secondly, oil products in the tank car enter an unloading pipeline through an unloading oil suction pipe under the self-priming action generated by a rotary piston pump, the oil products enter a gas-liquid separation tank for gas-liquid separation after being filtered by a filter, upper-layer gas after separation enters a gas pipeline network system or oil-gas recovery equipment from a gas pipeline at the top of the gas-liquid separation tank, liquid after separation is conveyed to a centrifugal pump through a discharge pipeline, and liquid materials after centrifugal separation are conveyed to a storage tank through an oil conveying pipeline;
and thirdly, when the unloading is finished, the two-section type liquid level probe fixed at the bottom of the unloading oil suction pipe sends a signal, the unloading electric valve is closed, the bin sweeping electric valve is opened, and meanwhile, the frequency of the rotary piston pump and the frequency of the centrifugal pump are respectively reduced through the two variable frequency controllers, so that bin sweeping operation is carried out.
Particularly, when the bin sweeping operation is carried out, if the gas-liquid mixed conveying proportion is too high, the oil supplementing pipe valve of the rotary piston pump is opened when the rotary piston pump shakes strongly, and oil is supplemented to an inlet pipeline of the rotary piston pump, so that the gas-liquid mixed conveying proportion is reduced; and after the bin sweeping is finished, closing a bin sweeping electric valve, an unloading electric valve, a gas-liquid separation tank inlet valve, a centrifugal pump inlet valve, a storage tank feeding valve, a rotary piston pump oil supplementing pipe valve and a gas-liquid separation tank exhaust valve, and finishing the unloading operation.
The beneficial effect of the invention is that,
1. the bin sweeping pipeline and the unloading pipeline are separately arranged, and the pipe diameters of the bin sweeping pipeline and the unloading pipeline are different, so that the phenomenon that bins cannot be swept is avoided;
2. the rotary piston pump is connected to the variable frequency controller, so that the frequency of the rotary piston pump can be obviously reduced during the sweeping operation, and the cavitation problem caused by the flow rate being smaller than the rated flow rate is solved, thereby realizing the unloading and sweeping operation process by one pump;
3. the rotary piston pump oil supplementing pipe is additionally arranged on the inlet pipeline of the rotary piston pump, so that the problems of overlarge pump vibration, high noise intensity and easy damage of the pump when the gas-liquid mixed transmission ratio is too high are solved;
4. the gas-liquid separation tank connected with the rotary piston pump is additionally arranged, so that the safety of the storage tank and the normal use of the centrifugal pump are ensured.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure, 1-unloading arm; 2-unloading the pipeline; 3-a bin sweeping pipeline; 4-a filter; 5-a rotary piston pump; 6-gas-liquid separation tank; 7-a gas line; 8-a centrifugal pump; 10-an oil pipeline; 11-a variable frequency controller; 12-a control system; 13-a liquid level probe; 14-a bin sweeping electric valve; 15-electric unloading valve; 16-inlet valve of gas-liquid separation tank; 17-centrifugal pump inlet valve; 18-a tank feed valve; 19-oil pipe valve of rotary piston pump; 20-unloading oil suction pipe; 21-a bin sweeping oil suction pipe; 22-gas-liquid separation tank exhaust valve.
Detailed Description
As shown in figure 1, a system for unloading light oil from a tank car by using a rotary piston pump comprises an unloading arm 1, a rotary piston pump 5, a gas-liquid separation tank 6, a centrifugal pump 8 and a control system 12, wherein an unloading oil suction pipe 20 and a bin sweeping oil suction pipe 21 are vertically arranged in the unloading arm 1 of a sleeve type structure, a liquid level probe 13 is fixedly arranged at the bottom of the unloading oil suction pipe 20, the upper ends of the unloading oil suction pipe 20 and the bin sweeping oil suction pipe 21 are respectively connected with an unloading pipeline and a bin sweeping pipeline 2, the unloading oil suction pipe 20 and the bin sweeping oil suction pipe 21 are communicated with an oil pipeline 10 and connected to the inlet of a filter 4 after being converged, the outlet pipeline of the filter 4 is connected with the inlet of the rotary piston pump 5, the outlet pipeline of the rotary piston pump 5 is connected with the gas-liquid separation tank 6, the discharge pipeline of the gas-liquid separation tank 6 is connected with the inlet of the centrifugal pump 8, the rotary piston pump 5 and the centrifugal pump 8, the outlet pipeline of the centrifugal pump 8 is divided into two branches, wherein one branch is connected to the storage tank through an oil pipeline 10, and the other branch is used as a rotary piston pump oil supplementing pipe and is communicated with the inlet pipeline of the rotary piston pump 5.
The unloading pipeline and the bin sweeping pipeline 2 are respectively provided with an unloading electric valve 15 and a bin sweeping electric valve 14; the top of the gas-liquid separation tank 6 is also provided with a gas pipeline 7, the gas pipeline 7 is provided with a gas exhaust valve, and the exhausted gas enters a gas pipeline network system or oil-gas recovery equipment; the liquid level probe 13 is of a two-section structure, and the liquid level probe 13 transmits a liquid level signal to the control system 12; a centrifugal pump inlet valve 17 is also arranged on an inlet pipeline of the centrifugal pump 8; a rotary piston pump oil supplementing pipe valve 19 is arranged on the rotary piston pump oil supplementing pipe, and a storage tank feeding valve 18 is arranged on an oil pipeline 10 connected with a storage tank; an inlet pipeline of the gas-liquid separation tank 6 is provided with a gas-liquid separation tank inlet valve 16.
A system operation method for unloading tank car light oil by adopting a rotary piston pump comprises the following operation steps:
firstly, closing a bin sweeping electric valve 14, opening an unloading electric valve 15, a gas-liquid separation tank inlet valve 16, a centrifugal pump inlet valve 17, a storage tank feeding valve 18 and a gas-liquid separation tank exhaust valve 22, and sequentially starting a rotary piston pump 5 and a centrifugal pump 8 to unload the tank car;
secondly, oil in the tank car enters an unloading pipeline through an unloading oil suction pipe 20 under the self-priming action generated by a rotary piston pump 5, the oil is filtered by a filter 3 and then enters a gas-liquid separation tank 6 for gas-liquid separation, the separated upper layer gas enters a gas pipeline network system or oil-gas recovery equipment from a gas pipeline 7 at the top of the gas-liquid separation tank 6, the layered liquid is conveyed to a centrifugal pump 8 through a discharge pipeline, and the centrifugally separated liquid material is conveyed to a storage tank through an oil conveying pipeline 10;
and thirdly, when the unloading is finished, the two-section type liquid level probe 13 fixed at the bottom of the unloading oil suction pipe 20 sends a signal, the unloading electric valve 15 is closed, the bin sweeping electric valve 14 is opened, and meanwhile, the frequencies of the rotary piston pump 5 and the centrifugal pump 8 are respectively reduced through the two variable frequency controllers 11, so that bin sweeping operation is carried out.
When the bin sweeping operation is carried out after the unloading is finished, if the gas-liquid mixed conveying proportion is too high, the rotary piston pump oil supplementing pipe valve 19 is opened when the rotary piston pump 5 shakes strongly, and oil is supplemented to an inlet pipeline of the rotary piston pump 5, so that the gas-liquid mixed conveying proportion is reduced; and after the bin sweeping is finished, closing the bin sweeping electric valve 14, the unloading line electric valve 15, the gas-liquid separation tank inlet valve 16, the centrifugal pump inlet valve 17, the storage tank feeding valve 18, the rotary piston pump oil supplementing pipe valve 19 and the gas-liquid separation tank exhaust valve 22, and finishing the unloading operation.
According to the invention, the bin sweeping pipeline 2 and the unloading pipeline are separately arranged, and the pipe diameters of the bin sweeping pipeline 2 and the unloading pipeline are different, so that the phenomenon that bins cannot be swept is avoided; the rotary piston pump 5 is connected to the variable frequency controller 11, so that the frequency of the rotary piston pump 5 can be obviously reduced during the sweeping operation, and the cavitation problem caused by the flow rate smaller than the rated flow rate is solved, thereby realizing the unloading and sweeping operation process of one pump; the rotary piston pump oil supplementing pipe is additionally arranged on the inlet pipeline of the rotary piston pump 5, so that the problems of overlarge pump vibration, high noise intensity and easy damage of the pump when the gas-liquid mixed transmission ratio is too high are solved; and a gas-liquid separation tank 6 connected with the rotary piston pump 5 is additionally arranged, so that the safety of the storage tank and the normal use of the centrifugal pump 8 are ensured.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (9)
1. The system for unloading the light oil of the tank car by using the rotary piston pump is characterized by comprising an unloading oil filling pipe, the rotary piston pump, a gas-liquid separation tank, a centrifugal pump and a control system, wherein an unloading oil suction pipe and a bin sweeping oil suction pipe are vertically arranged inside the unloading oil filling pipe of a sleeve type structure, a liquid level probe is fixedly arranged at the bottom of the unloading oil suction pipe, the upper ends of the unloading oil suction pipe and the bin sweeping oil suction pipe are respectively connected with an unloading pipeline and a bin sweeping pipeline, the unloading pipeline and the bin sweeping pipeline are communicated with an oil conveying pipeline after being converged and connected to a filter inlet, a filter outlet pipeline is connected with the inlet of the rotary piston pump, the outlet pipeline of the rotary piston pump is connected with the gas-liquid separation tank, a discharge pipeline of the gas-liquid separation tank is connected with the inlet of the centrifugal pump, and the rotary piston pump and the centrifugal pump are respectively connected to the control system, the outlet pipeline of the centrifugal pump is divided into two branches, wherein one branch is connected to the storage tank through an oil pipeline, and the other branch is used as an oil supplementing pipe of the rotary piston pump and is communicated with the inlet pipeline of the rotary piston pump.
2. The system for unloading light oil from a tanker using a rotary piston pump as claimed in claim 1, wherein said unloading line and said sweeping bin line are provided with an unloading electric valve and a sweeping bin electric valve, respectively.
3. The system for unloading a light oil from a tank car using a rotary piston pump according to claim 2, wherein a gas line is further provided on the top of the gas-liquid separation tank, a gas discharge valve of the gas-liquid separation tank is provided on the gas line, and the discharged gas is introduced into the gas piping system or the oil gas recovery apparatus.
4. The system for unloading a tank car light oil using a rotary piston pump according to claim 3, wherein the liquid level probe has a two-stage structure, and transmits a liquid level signal to the control system.
5. A system for unloading a tanker light oil using a rotary piston pump according to claim 4, wherein a centrifugal pump inlet valve is also provided in the inlet line of the centrifugal pump.
6. The system for unloading light oil from a tank car by using a rotary piston pump according to claim 5, wherein a rotary piston pump oil supply pipe valve is provided on the rotary piston pump oil supply pipe, and a tank feed valve is provided on an oil delivery line connected to the tank.
7. The system for unloading a light oil from a tank car using a rotary piston pump according to claim 6, wherein a gas-liquid separation tank inlet valve is provided on the gas-liquid separation tank inlet line.
8. A method of operating a system for unloading tanker light oil using a rotary piston pump according to claim 7, characterized by the following steps:
firstly, closing an electric valve of a bin sweeping line, opening an electric valve of an unloading line, an inlet valve of a gas-liquid separation tank, an inlet valve of a centrifugal pump, a feeding valve of a storage tank and an exhaust valve of the gas-liquid separation tank, and starting a rotary piston pump and the centrifugal pump in sequence to unload the tank car;
secondly, oil products in the tank car enter an unloading pipeline through an unloading oil suction pipe under the self-priming action generated by a rotary piston pump, the oil products enter a gas-liquid separation tank for gas-liquid separation after being filtered by a filter, upper-layer gas after separation enters a gas pipeline network system or oil-gas recovery equipment from a gas pipeline at the top of the gas-liquid separation tank, liquid after separation is conveyed to a centrifugal pump through a discharge pipeline, and liquid materials after centrifugal separation are conveyed to a storage tank through an oil conveying pipeline;
and thirdly, when the unloading is finished, the two-section type liquid level probe fixed at the bottom of the unloading oil suction pipe sends a signal, the unloading electric valve is closed, the bin sweeping electric valve is opened, and meanwhile, the frequency of the rotary piston pump and the frequency of the centrifugal pump are respectively reduced through the two variable frequency controllers, so that bin sweeping operation is carried out.
9. The method according to claim 8, wherein in the sweeping operation, if the gas-liquid mixture ratio is too high, the rotary piston pump oil-replenishing pipe valve is opened when the rotary piston pump is strongly vibrated, so as to replenish oil to the inlet pipeline of the rotary piston pump, thereby reducing the gas-liquid mixture ratio; and after the bin sweeping is finished, closing a bin sweeping electric valve, an unloading electric valve, a gas-liquid separation tank inlet valve, a centrifugal pump inlet valve, a storage tank feeding valve, a rotary piston pump oil supplementing pipe valve and a gas-liquid separation tank exhaust valve, and finishing the unloading operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810571389.3A CN110566815B (en) | 2018-06-06 | 2018-06-06 | System for unloading tank car light oil by using rotary piston pump and operation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810571389.3A CN110566815B (en) | 2018-06-06 | 2018-06-06 | System for unloading tank car light oil by using rotary piston pump and operation method thereof |
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| Publication Number | Publication Date |
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| CN110566815A CN110566815A (en) | 2019-12-13 |
| CN110566815B true CN110566815B (en) | 2021-03-19 |
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| CN114620668B (en) * | 2022-03-31 | 2024-03-22 | 山东京博物流股份有限公司 | Asphalt unloading pump pool anti-blocking device and method |
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