CN203489008U - ESD system for LNG and LCNG site sub station skid-mounted full integration - Google Patents

Abstract

The utility model discloses an ESD system for LNG and LCNG site sub station skid-mounted full integration, belongs to a hydraulic or compressed gas supplying system, and particularly relates to a safety system for LNG and LCNG site sub station skid-mounted full integration. The ESD system is characterized in that the ESD system comprises an ESD control gas pipeline connected to a gas-phase gas outlet pipeline of an LNG storage tank; an electromagnetic three-way valve is installed on the ESD control gas pipeline; the portion, behind the electromagnetic three-way valve, of the ESD control gas pipeline is respectively connected with a backpressure chamber of a gas-phase gas outlet pipeline quick action emergency valve, a backpressure chamber of a liquid-phase pipeline quick action emergency valve and a backpressure chamber of a supercharger liquid-phase pipeline quick action emergency valve, and a control wire of the electromagnetic three-way valve is connected to a control output circuit of a system alarming and emergency processing unit of a site sub station controller. The ESD system can automatically conduct polling on data of each sensor, judge abnormal phenomena and send alarming signals or automatically take emergency shutdown measures according to the range of abnormal data.

Description

The on-the-spot substation of the fully integrated LNG of skidization and LCNG ESD system

Technical field

The utility model belongs to the safety system of liquefaction or the fully integrated LNG of pressurized gas supply system, particularly skidization and the on-the-spot substation of LCNG.

Background technique

Along with rock gas is more and more in the quantity that is widely used LNG and the on-the-spot substation of LCNG skidization of automotive field, existing on-the-spot substation does not have perfect ESD system (being Emergency Shutdown Device emergency stopping system), all generally to record relevant data by sensor, the control room of transmitting, there are control personnel normally whether to operate according to detecting data, when finding that appearance is abnormal, manual operation is stopped in emergency, this mode handling failure not in time, and need professional to operate, be not suitable for telecontrol.

Model utility content

In order to overcome the deficiency of the on-the-spot substation LNG of existing LNG and LCNG skidization and the on-the-spot substation of LCNG skidization, the utility model provides the fully integrated LNG of a kind of skidization and the on-the-spot substation of LCNG ESD system, the on-the-spot substation of the fully integrated LNG of this skidization and LCNG ESD system can realize the data of each sensor of automatic detecting, in time anomaly is judged and can send respectively alarm signal or automatically take the measure of stopping in emergency according to the scope of abnormal data.

The utility model solves the technological scheme that its technical problem adopts: the on-the-spot substation of the fully integrated LNG of a kind of skidization and LCNG ESD system, it is characterized in that: comprise the ESD control gas pipeline on the gas phase outlet pipe that is connected to LNG holding vessel, on this pipeline, three-way solenoid valve is installed, between three-way solenoid valve and LNG holding vessel, be equipped with and control source of the gas valve, ESD after three-way solenoid valve control with gas pipeline respectively with gas phase outlet pipe Emergeny Cutoff Valves, liquid pipe Emergeny Cutoff Valves, the back pressure chamber of pressurized machine liquid pipe Emergeny Cutoff Valves is connected, the guide line of three-way solenoid valve is connected on the system alarm of on-the-spot substation controller and the control output circuit of emergency processing unit,

On the described system alarm of on-the-spot substation controller and the control output circuit of emergency processing unit, be also connected acoustic-optic alarm,

The described system alarm of on-the-spot substation controller and the data capture end of emergency processing unit are being connected the sensor that is positioned at prying body each several part.

The described sensor that is positioned at prying body each several part comprises that at least one is arranged on the leak check prober on prying body.

The described sensor that is positioned at prying body each several part comprises that at least one is arranged on the flammable gas alarm on prying body.

The described sensor that is positioned at prying body each several part comprises and is connecting the pressure transducer being arranged on each air filling gun and/or liquid feeding gun barrel road.

The described sensor that is positioned at prying body each several part comprises and is connecting the pressure transducer being arranged on LNG immersed pump and LCNG plunger pump.

Under normal circumstances, system is not reported to the police and abnormal state.ESD system (being Emergency Shutdown Device emergency stopping system), among monitoring in real time, can not made intervention to LNG and the fully integrated device of LCNG skidization.But when abnormal generation, ESD system judges according to logic program, according to system emergency, makes corresponding processing.Such as acoustooptic alarm, termination of pumping shutdown, emergency blow-down and emergency cut-off LNG liquid and gas valve etc.

If find LNG and the fully integrated device of LCNG skidization, there are the urgent anomalies of system such as leakage phenomenon, combustible gas height are reported to the police, air filling gun is broken.In ESD system responses control flow chart, ESD cellular system can be carried out logical analysis and judgement to system exception phenomenon, and then the rank of the anomaly of distinguishing one from the other makes concrete intervening measure.According to the difference size of procedures system parameter and normal setting value, be divided into 1 grade of warning, 2 grades of warnings, 3 grades of warnings and stop in emergency.In ESD system logic figure, be first that system powers on and carries out self check, after system is normal, carry out logic judgement below.

The first system leak check prober TE1, TE2, TE3, TE4, TE5, TE6,

Second system checks flammable gas alarm AE1, AE2, AE3, AE4, AE5, AE6,

The 3rd checks the delivery pressure of LNG immersed pump,

The 4th checks the delivery pressure of LCNG plunger pump,

The 5th checks that LNG adds hydraulic coupling,

The 6th checks that CNG adds atmospheric pressure,

According to above detection, according to procedure parameter and the size of normal setting value judge, if belong to state of alarm, according to the rank of state of alarm, carry out 1 grade of warning of acousto-optic, 2 grades of acousto-optics and 3 grades of warnings of warning acousto-optic.If system is in emergency circumstances, emergency treatment request is made to LNG and LCNG substation in ESD unit: the gas phase valve and the liquid phase valve that cut off LNG storage tank.LNG and LCNG substation obtain after ESD unit requests, according to program, carry out following operation: allow the DO clamp of PLC, FV-1 three-way solenoid valve obtains electric.FV-1 three-way solenoid valve obtain electric before, the back pressure chamber of EMS-1EMS-2EMS-3 emergency stop cock communicates with atmosphere by FV-1 three-way solenoid valve, the back pressure chamber pressure of emergency stop cock equals zero.Now, EMS-1EMS-2EMS-3 emergency stop cock is channel status.FV-1 three-way solenoid valve obtain electric after, actuator's back pressure chamber is by FV-1 three-way solenoid valve, with the top BOG UNICOM of LNG storage tank.Pressure improves rapidly, and its pressure is equal to LNG tank top pressure, has closed rapidly EMS-1EMS-2EMS-3 emergency stop cock.In the case, LNG aerator and LCNG aerator, do not had raw material sources, and system is under comparatively safe pattern.

The beneficial effects of the utility model are data that the fully integrated LNG of this skidization and the on-the-spot substation of LCNG ESD system can realize each sensor of automatic detecting, in time anomaly are judged and can send respectively alarm signal or automatically take the measure of stopping in emergency according to the scope of abnormal data.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model,

Fig. 2 is ESD components of system as directed logic diagram.

In figure, 1.LNG holding vessel, 2. gas phase outlet pipe, 3.ESD control gas pipeline, 4. three-way solenoid valve, the emptying end of 41. three-way solenoid valve, 5. control source of the gas valve, 6. gas phase outlet pipe Emergeny Cutoff Valves, 7. liquid pipe Emergeny Cutoff Valves, 8. pressurized machine liquid pipe Emergeny Cutoff Valves, 9. liquid pipe, 10. pressurized machine liquid pipe, 11. gas phase interfaces, 12. liquid phase interfaces, 13. pressurized machine liquid phase interfaces, 21. system power-on self-tests, 22. Leak testtion judgements, 23. gas leakages detect judgement, the judgement of 24.LNG pump discharge pressure, the judgement of 25.LCNG pump discharge pressure, the judgement of 26.LNG liquid filler pressure, the judgement of 27.CNG filling machine pressure, 28. acoustic-optic alarms, 29. electromagnetic cross valve control equipment, 30. gas phases, liquid phase, pressurized machine liquid phase emergency cut-off valve control system.

Embodiment

Embodiment of the present utility model is, as shown in the figure:

Embodiment 1, the on-the-spot substation of the fully integrated LNG of a kind of skidization and LCNG ESD system, it is characterized in that: comprise that the ESD on the gasphase outlet pipe 2 that is connected toLNG holding vessel 1 controls withgas pipeline 3, three-way solenoid valve 4 is installed on this pipeline, between three-way solenoid valve and LNG holding vessel, be equipped with and control source of thegas valve 5, ESD after three-way solenoid valve control with gas pipeline respectively with gas phase outlet pipeEmergeny Cutoff Valves 6, liquid pipeEmergeny Cutoff Valves 7, the back pressure chamber of pressurized machine liquid pipe Emergeny Cutoff Valves 8 is connected, the guide line of three-way solenoid valve is connected on the system alarm of on-the-spot substation controller and the control output circuit of emergency processing unit,

On the described system alarm of on-the-spot substation controller and the control output circuit of emergency processing unit, be also connected acoustic-optic alarm,

The described system alarm of on-the-spot substation controller and the data capture end of emergency processing unit are being connected the sensor that is positioned at prying body each several part.

The described sensor that is positioned at prying body each several part comprises that at least one is arranged on the leak check prober on prying body.

The described sensor that is positioned at prying body each several part comprises that at least one is arranged on the flammable gas alarm on prying body.

The described sensor that is positioned at prying body each several part comprises and is connecting the pressure transducer being arranged on each air filling gun and/or liquid feeding gun barrel road.

The described sensor that is positioned at prying body each several part comprises and is connecting the pressure transducer being arranged on LNG immersed pump and LCNG plunger pump.

Claims (5)

1. the on-the-spot substation of the fully integrated LNG of skidization and LCNG ESD system, it is characterized in that: comprise the ESD control gas pipeline on the gas phase outlet pipe that is connected to LNG holding vessel, on this pipeline, three-way solenoid valve is installed, between three-way solenoid valve and LNG holding vessel, be equipped with and control source of the gas valve, ESD after three-way solenoid valve control with gas pipeline respectively with gas phase outlet pipe Emergeny Cutoff Valves, liquid pipe Emergeny Cutoff Valves, the back pressure chamber of pressurized machine liquid pipe Emergeny Cutoff Valves is connected, the guide line of three-way solenoid valve is connected on the system alarm of on-the-spot substation controller and the control output circuit of emergency processing unit,

On the described system alarm of on-the-spot substation controller and the control output circuit of emergency processing unit, be also connected acoustic-optic alarm,

The described system alarm of on-the-spot substation controller and the data capture end of emergency processing unit are being connected the sensor that is positioned at prying body each several part.

2. the on-the-spot substation of the fully integrated LNG of skidization according to claim 1 and LCNG ESD system, is characterized in that: the described sensor that is positioned at prying body each several part comprises that at least one is arranged on the leak check prober on prying body.

3. the on-the-spot substation of the fully integrated LNG of skidization according to claim 1 and LCNG ESD system, is characterized in that: the described sensor that is positioned at prying body each several part comprises that at least one is arranged on the flammable gas alarm on prying body.

4. the on-the-spot substation of the fully integrated LNG of skidization according to claim 1 and LCNG ESD system, is characterized in that: the described sensor that is positioned at prying body each several part comprises and connecting the pressure transducer being arranged on each air filling gun and/or liquid feeding gun barrel road.

5. the on-the-spot substation of the fully integrated LNG of skidization according to claim 1 and LCNG ESD system, is characterized in that: the described sensor that is positioned at prying body each several part comprises and connecting the pressure transducer being arranged on LNG immersed pump and LCNG plunger pump.

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