CN210950804U - First class liquid high-risk chemical storage and conveying system - Google Patents

Abstract

A high-risk chemical storage and conveying system for class-A liquid comprises an underground storage tank, a first cache tank, a second cache tank, a centrifugal conveying pump and a DCS monitoring controller, wherein the first cache tank is arranged below the second cache tank and connected with the second cache tank through a first conveying pipeline, a first electromagnetic control valve is arranged on the first conveying pipeline, and a side wall liquid outlet at the bottom of the first cache tank, the centrifugal conveying pump and a side wall liquid inlet at the bottom of the second cache tank are sequentially connected through conveying pipelines; the top of the second buffer tank is connected with a chemical output pipeline, a second electromagnetic control valve is arranged on the second buffer tank, the underground storage tank is connected with the top of the first buffer tank through a second conveying pipeline, and the centrifugal conveying pump, the first electromagnetic control valve and the second electromagnetic control valve are respectively and electrically connected with the DCS monitoring controller. The utility model discloses a design of buffer memory jar has avoided in the transportation process unstable factor to relapse dangerous process operation for the multifrequency that operating personnel brought to through DCS controller remote control, improved the security that the chemicals were carried.

Description

First class liquid high-risk chemical storage and conveying system

Technical Field

The utility model relates to a liquid conveying system especially relates to a first class liquid high-risk chemical stores conveying system.

Background

With the rapid development of national industrial economy in recent years, the situation of safe production management is extremely severe, and the requirements of safe management work are continuously improved, especially in the petrochemical industry. From the activity theme of safe production month in 2019, namely 'preventing risk, removing hidden danger and suppressing accidents', the identification of safety risk factors and the investigation of the safety hidden danger are improved to the top of the current safe production management work, and the long-term and short-term recognition of the national safe management work is fully reflected.

As the petrochemical industry which focuses on national safety management work, various safety production influence factors and major hazard source hidden dangers are frequently and frequently found, and the variety is various, such as storage of chemical materials, conveying and transferring of the chemical materials and the like, especially high-risk liquid chemicals of class A.

In the petrochemical industry at present, most of class A liquid high-risk chemicals are stored in an overground storage tank. In addition, the site needs to keep an absolute safety distance with adjacent buildings and production devices, so that the occupied area of the storage tank site is large, and effective site resources are wasted; the storage tank site of the high-risk liquid chemicals of the class A needs to be provided with cooling water and a light shield so as to avoid the problems of evaporation, loss and the like of the high-risk liquid chemicals caused by the environmental factors such as ultraviolet irradiation, temperature change and the like of the storage tank. And finally, the total construction cost of the project is improved, the construction process is complicated, and the progress is slow.

According to the physicochemical property characteristics of the high-risk chemical of the class A liquid, "electrostatic phenomenon" in the conveying process is an important safety influence factor. At present, in the petrochemical industry, the country (company) pays particular attention to the electrostatic phenomenon in the process of conveying high-risk chemicals, the conveying flow rate of different types of high-risk chemicals has strict control standards, the conveying matching device is required to be explosion-proof, and complete and effective electrostatic jumper wires and final grounding devices are required to be arranged among pipelines, flanges, valves and conveying pumps. In addition, on-site patrol and operators need to wear the antistatic working clothes according to the standards strictly. However, according to incomplete statistics, in the field of 10 years, the number of fire and explosion accidents caused by electrostatic phenomena in the process of on-site chemical delivery is as high as 154, the number of on-site casualties is nearly 220, and the direct property loss is about 85 billion yuan. In view of the above surprising statistical data of the safety accidents, the reason for this is that the serious consequences occur after the accidents occur due to the poor operating conditions, the low level of operators and the large number of field inspection and operators on the high-risk chemical delivery field.

The centrifugal pipeline conveying pump is liquid material transferring and conveying equipment commonly used in petrochemical industry, and has the advantages of simple structure, high working efficiency, convenience in maintenance and the like. But the inconvenience lies in that before the pump operates, the pump body must be filled with liquid materials (commonly called as pump filling) to ensure the normal operation. At present, common pump filling methods in petrochemical enterprises include a tap water pump filling method (on the premise that tap water does not have a physicochemical reaction on a conveyed material), a forward flow pump filling method, a backflow pump filling method, an air suction and suction method and the like. The above several pump filling methods are all industrial commonly used centrifugal conveying pump filling methods, and all have certain limitations or operation leaks, field operators often need to repeatedly perform pump filling operations for multiple times due to production requirements, especially in the process of conveying high-risk chemical substances such as class A liquid, the repeated pump filling operations for multiple times are a great safety influence factor, the personal life safety of the field operators is seriously threatened, and the conveying process is unstable, and in addition, once the centrifugal conveying pump is arranged at a special position due to the design requirements of industrial production, the above several methods cannot perfectly meet the requirements of stable production.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome prior art drawback, a first class liquid high-risk chemical storage conveying system is provided, it has changed the mode that first class liquid high-risk chemical tradition of petrochemical industry ground storage tank was saved to through the design of buffer memory jar, the multifrequency that has avoided among the transportation unstable factor to bring for field operation personnel repeats dangerous process operation, whole storage conveyer passes through DCS controller remote control operation simultaneously, also provides the safety guarantee for high-risk chemical transportation process.

The utility model provides a technical scheme that its technical problem adopted is:

a conveying system for storing high-risk class-A liquid chemicals comprises an underground storage tank, an overground conveying unit and a DCS monitoring controller, wherein the overground conveying unit comprises a first cache tank, a second cache tank and a centrifugal conveying pump which are arranged on the ground, the first cache tank is arranged below the second cache tank, a backflow liquid inlet at the top of the first cache tank is connected with a backflow liquid outlet at the bottom of the second cache tank through a first conveying pipeline, a first electromagnetic control valve is arranged on the first conveying pipeline, the centrifugal conveying pump is arranged on one side of a liquid outlet on the side wall of the bottom of the first cache tank, the centrifugal conveying pump and a liquid inlet on the side wall of the bottom of the second cache tank are sequentially connected through conveying pipelines, and a first spherical control valve and a second spherical control valve are respectively arranged on a liquid inlet pipeline and a liquid outlet pipeline of the centrifugal conveying pump, a first one-way check valve is arranged between the second spherical control valve and a liquid outlet of the centrifugal conveying pump, a chemical tank opening is formed in the top of the first cache tank, and a third spherical control valve is arranged at the chemical tank opening;

the top of the second cache tank is connected with a chemical output pipeline, and a second electromagnetic control valve and a flowmeter are arranged on the chemical output pipeline;

the underground storage tank is connected with the top of the first cache tank through a second conveying pipeline, the bottom of the second conveying pipeline is arranged at the bottom of the underground storage tank, a magnetic float liquid level meter is arranged on the underground storage tank, and a vent hole is formed in the top of the underground storage tank and connected with an external tail gas absorption system; the centrifugal delivery pump, the first electromagnetic control valve, the second electromagnetic control valve, the flowmeter and the magnetic float level meter are respectively and electrically connected with the DCS monitoring controller.

Above-mentioned first class liquid high-risk chemical storage conveying system, the volume of first buffer memory jar and second buffer memory jar equals, and is greater than second pipeline's volume. The phenomenon of 'empty pump' of the centrifugal delivery pump in the process of first starting is avoided.

Above-mentioned conveyor system is stored to first class liquid high-risk chemical, the top of second buffer memory jar is still connected and is provided with one-way admission line, set up the one-way admission valve of second on the one-way admission line.

Above-mentioned first class liquid high-risk chemical storage conveying system, centrifugal delivery pump with first buffer memory jar is horizontal setting.

Above-mentioned first class liquid high-risk chemical stores conveying system, the underground storage tank is the SF storage tank.

The utility model has the advantages that:

the high-risk chemical storage tank is arranged underground, the safety distance is shortened, the safety factor is improved, and the construction difficulty and the construction cost are relatively reduced; secondly, two high-risk chemical buffer tanks interact with each other in the conveying process, so that the condition that the centrifugal conveying pump is empty due to uncertain factors in the conveying field is avoided, the dangerous process that operators repeatedly fill the pump for multiple times in the conveying process is omitted, and the first-level guarantee is added to the safety and the stability of the whole high-risk chemical conveying process; thirdly, the monitoring and the control of the whole high-risk chemical conveying process are remotely operated by one key through the DCS controller, the number of the conveying field patrol and the number of operators are reduced, and the personal safety of the operators is also practically guaranteed.

Drawings

The present invention will be further explained with reference to the accompanying drawings.

Fig. 1 is a schematic view of the overall structure of the present invention.

In the figure: 1. an underground storage tank; 2. a DCS monitoring controller; 3. a first cache tank; 3-1, filling a chemical tank opening; 3-2, a third ball type control valve; 4. a second cache tank; 5. a centrifugal delivery pump; 6. a first delivery conduit; 7. a first solenoid control valve; 8. a first ball-type control valve; 9. a second ball-type control valve; 10. a first one-way check valve; 11. a chemical output conduit; 12. a one-way air intake duct; 13. a second solenoid control valve; 14. a flow meter; 15. a second one-way intake valve; 16. a second delivery conduit; 17. a magnetic float level gauge; 18. a vent port; 19. and a tail gas absorption system.

Detailed Description

The present invention will be further described with reference to the following examples.

Referring to fig. 1, the high-risk chemical storage and delivery system of the present invention comprises an underground storage tank 1, an above-ground delivery unit and a DCS monitor controller 2, wherein the above-ground delivery unit comprises a first buffer tank 3, a second buffer tank 4 and a centrifugal delivery pump 5, the first buffer tank 3 is disposed below the second buffer tank 4, a backflow inlet at the top of the first buffer tank 3 is connected to a backflow outlet at the bottom of the second buffer tank 4 through a first delivery pipe 6, the first delivery pipe 6 is provided with a first solenoid control valve 7, when delivering chemicals outwards, the first solenoid control valve 7 is closed, the centrifugal delivery pump 5 is disposed at one side of a bottom side wall liquid outlet of the first buffer tank 3, the centrifugal delivery pump 5 and the bottom side wall liquid inlet of the second buffer tank 4 are horizontally disposed, and the bottom side wall liquid outlet of the first buffer tank 3, the centrifugal delivery pump 5 and the bottom side wall liquid inlet of the second buffer tank 4 are sequentially connected through delivery pipes, a liquid inlet pipeline and a liquid outlet pipeline of the centrifugal conveying pump 5 are respectively provided with a first spherical control valve 8 and a second spherical control valve 9, the two spherical control valves are in a normally open state (except for being closed when parking and maintenance are carried out), a first one-way check valve 10 is arranged between the second spherical control valve 9 and the liquid outlet of the centrifugal conveying pump 5 to prevent liquid from flowing back, the top of the first cache tank 3 is provided with a chemical tank opening 3-1, and a third spherical control valve 3-2 is arranged at the chemical tank opening 3-1;

the top of the second cache tank 4 is connected with a chemical output pipeline 11 and a one-way air inlet pipeline 12, the chemical output pipeline 11 is provided with a second electromagnetic control valve 13 and a flowmeter 14, and the one-way air inlet pipeline 12 is provided with a second one-way air inlet valve 15;

the underground storage tank 1 is an SF storage tank and is arranged underground, and is connected with the top of the first cache tank 3 through a second conveying pipeline 16, the bottom of the second conveying pipeline 16 is arranged at the bottom of the underground storage tank 1, a magnetic float liquid level meter 17 is arranged on the underground storage tank 1, and a vent 18 is arranged at the top of the underground storage tank 1 and is connected with an external tail gas absorption system 19; the centrifugal delivery pump 5, the first electromagnetic control valve 7, the second electromagnetic control valve 13, the flow meter 14 and the magnetic float level meter 17 are respectively and electrically connected with the DCS monitoring controller 2. The volumes of the first buffer tank 3 and the second buffer tank 4 are equal and larger than the volume of the second conveying pipeline 16.

The working process is as follows: when high-risk chemicals are stored and conveyed for the first time, manual filling operation is required along with the first cache tank 3, the high-risk chemicals are filled into the first cache tank from a chemical filling opening 3-1 in the top of the first cache tank 3, the high-risk chemicals flow into the underground storage tank 1 from the second conveying pipeline 16, the liquid level height of liquid in the underground storage tank is measured through the magnetic float liquid level meter 17, after filling is finished, the third spherical control valve 3-2 is manually closed, and field operators are evacuated; then, the centrifugal delivery pump 5 is remotely started through the DCS monitoring controller 2, and meanwhile, the linkage setting is carried out according to a program in advance of the DCS monitoring controller 2, at the moment, the first electromagnetic control valve 7 on the first delivery pipeline 6 is automatically closed, the second electromagnetic control valve 13 on the chemical output pipeline 11 is automatically opened, and the first spherical control valve 8 and the second spherical control valve 9 are in an open state; meanwhile, the centrifugal delivery pump 5 is started, high-risk chemicals in the underground storage tank 1 enter the first cache tank 3 through the second delivery pipeline 16, then enter the second cache tank 4 through the centrifugal delivery pump 5, and finally are output to a production workshop through the chemical output pipeline 11.

Before the conveying process is finished, the centrifugal conveying pump 5 is remotely closed through the DCS monitoring controller 2, meanwhile, according to the previous program linkage setting of the DCS monitoring controller 5, the first electromagnetic control valve 7 on the first conveying pipeline 6 is automatically opened, the second electromagnetic control valve 13 on the chemical output pipeline 11 is automatically closed, and high-risk chemicals in the second cache tank 4 automatically flow back to the first cache tank 3 by means of self gravity. After the conveying process is stopped, the whole system is in a negative pressure state, and the second one-way air inlet valve 15 on the one-way air inlet pipeline 12 at the top of the second cache tank 4 is arranged, so that the empty pump operation phenomenon of the centrifugal conveying pump 5 can not occur when the next high-risk chemical conveying process is started, and the field work conveying and tank filling operation is avoided.

In the process of conveying high-risk chemicals, the chemical liquid level condition in the underground storage tank 1 is monitored through a magnetic float liquid level meter 17 arranged in the underground storage tank, the magnetic float liquid level meter 17 is electrically connected with a DCS monitoring controller, and the magnetic float liquid level meter transmits a liquid level signal to the DCS monitoring controller to realize remote monitoring of the DCS monitoring controller; in addition, the flowmeter 14 on the chemical output pipeline 11 is electrically connected with the DCS monitoring controller, so that the remote monitoring and control of the chemical conveying flow speed are realized, and the phenomenon that the conveying flow speed exceeds the maximum flow speed requirement of high-risk chemicals, the electrostatic phenomenon occurs and safety accidents are caused is avoided.

Claims (5)

1. The utility model provides a class A liquid high-risk chemical stores conveying system which characterized in that: the conveying system comprises an underground storage tank (1), an overground conveying unit and a DCS monitoring controller (2), wherein the overground conveying unit comprises a first cache tank (3), a second cache tank (4) and a centrifugal conveying pump (5), the first cache tank (3) is arranged below the second cache tank (4), a backflow liquid inlet at the top of the first cache tank (3) is connected with a backflow liquid outlet at the bottom of the second cache tank (4) through a first conveying pipeline (6), a first electromagnetic control valve (7) is arranged on the first conveying pipeline (6), the centrifugal conveying pump (5) is arranged on one side of a bottom side wall liquid outlet of the first cache tank (3), the centrifugal conveying pump (5) and a bottom side wall liquid inlet of the second cache tank (4) are sequentially connected through conveying pipelines, a liquid inlet pipeline and a liquid outlet pipeline of the centrifugal conveying pump (5) are respectively provided with a first spherical control valve (8) and a second spherical control valve (9), a first one-way check valve (10) is arranged between the second spherical control valve (9) and the liquid outlet of the centrifugal conveying pump (5), the top of the first cache tank (3) is provided with a chemical tank opening (3-1), and a third spherical control valve (3-2) is arranged at the chemical tank opening (3-1);

the top of the second buffer tank (4) is connected with a chemical output pipeline (11), and a second electromagnetic control valve (13) and a flowmeter (14) are arranged on the chemical output pipeline (11);

the underground storage tank (1) is connected with the top of the first cache tank (3) through a second conveying pipeline (16), the bottom of the second conveying pipeline (16) is arranged at the bottom of the underground storage tank (1), a magnetic float liquid level meter (17) is arranged on the underground storage tank (1), and a vent hole (18) is formed in the top of the underground storage tank (1) and is connected with an external tail gas absorption system (19); the centrifugal delivery pump (5), the first electromagnetic control valve (7), the second electromagnetic control valve (13), the flowmeter (14) and the magnetic float level meter (17) are respectively and electrically connected with the DCS monitoring controller (2).

2. The high-risk class A liquid chemical storage and delivery system according to claim 1, wherein: the volumes of the first buffer tank (3) and the second buffer tank (4) are equal and larger than the volume of the second conveying pipeline (16).

3. The high-risk class A liquid chemical storage and delivery system according to claim 2, wherein: the top of the second buffer tank (4) is also connected with a one-way air inlet pipeline (12), and a second one-way air inlet valve (15) is arranged on the one-way air inlet pipeline (12).

4. The high-risk class A liquid chemical storage and delivery system according to claim 3, wherein: the centrifugal delivery pump (5) and the first buffer tank (3) are horizontally arranged.

5. The high-risk class A liquid chemical storage and delivery system according to claim 4, wherein: the underground storage tank (1) is an SF storage tank.

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