Ship-shore nitrogen supplementing device for waste gas recovery device

Abstract

The utility model discloses a ship-shore nitrogen supplementing device for a waste gas recovery device, which relates to the technical field of waste gas recovery, and comprises a pipeline, a nitrogen pipe, and an intake oxygen content detector, a pressure / vacuum valve, a gas-liquid separator, a detonation-resistant flame arrester and an exhaust oxygen content detector which are arranged on the pipeline, the exhaust gas oxygen content detector is installed at the gas outlet end of the pipeline, the gas inlet end of the nitrogen pipe is connected with nitrogen, the gas outlet end of the nitrogen pipe is connected with the gas-liquid separator, and the pressure / vacuum valve is installed between the inlet gas oxygen content detector and the gas-liquid separator. According to the utility model, parameters such as pressure, temperature, flow, oxygen content and the like of oil gas in the ship loading process are monitored on line, so that the functions of automatic self-inspection, automatic alarm and automatic protection are realized, abnormal conditions of oxygen content can be timely handled, linkage with ship loading operation at a wharf is kept, and a nitrogen access port is reserved, so that the oxygen content is prevented from exceeding the standard, and the cleaning work is carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas recovery, in particular to a ship-shore nitrogen replenishing device for a waste gas recovery device. Background Art

[0002] The ship-shore safety device is an important part of the waste gas recovery facilities at port terminals. The safe design and stable operation of the system are directly related to the safety of ships and the stability of loading operations, as well as the safe production of onshore oil and gas recovery facilities. According to the standards, the waste gas generated by loading must be below the lower explosion limit before entering the waste gas recovery device. It must pass through the "ship-shore safety device" to ensure that the waste gas is within a safe range before it can be collected and treated.

[0003] Currently, all waste gas recovery devices on the docks in the market require the ship to inertate them by itself to meet the requirements; for ships that cannot inert themselves, they need to be inerted with nitrogen at the dock, which reduces operating efficiency and brings risks to dock operations. Utility Model Content

[0004] The purpose of the utility model is to solve the problems existing in the prior art and to propose an exhaust gas recovery device and a ship-shore nitrogen replenishing device.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An exhaust gas recovery device and a ship-shore nitrogen replenishment device include a pipeline, a nitrogen pipe, and an intake oxygen content detector, a pressure / vacuum valve, a gas-liquid separator, a detonation-proof flame arrester and an exhaust oxygen content detector arranged on the pipeline. The intake oxygen content detector is installed at the intake end, and the exhaust oxygen content detector is installed at the outlet end of the pipeline. The intake end of the nitrogen pipe is connected to nitrogen and the outlet end is connected to the gas-liquid separator. The pressure / vacuum valve is installed between the intake oxygen content detector and the gas-liquid separator, and the detonation-proof flame arrester is installed between the gas-liquid separator and the exhaust oxygen content detector.

[0007] Preferably, a fire stop cap is provided on the pressure / vacuum valve, and an electric drain valve is provided on the fire stop cap and the pressure / vacuum valve.

[0008] Preferably, an air intake valve is installed between the detonation-proof flame arrester and the gas-liquid separator, and a self-operated pressure regulating valve and an electric regulating valve are provided on the nitrogen pipe. The electric regulating valve is opened when the air intake oxygen content detector detects that the volume ratio of the oxygen content of the gas in the pipeline is higher than 6%. The exhaust oxygen content detector detects the target value of the outlet oxygen content and alarms. When the volume ratio of the oxygen content in the pipeline is higher than 8%, the air intake valve is closed and emergency discharge and chain alarm shutdown are implemented through the electric drain valve.

[0009] Preferably, the electric regulating valve adopts PID to adjust the nitrogen supplement amount, and the operating parameter of PID to adjust the nitrogen supplement amount adopts one of a proportional coefficient, an integral coefficient and a differential coefficient.

[0010] Preferably, nitrogen is introduced into the nitrogen pipe for inerting to ensure that the volume ratio of oxygen content at the outlet is lower than 8%, and the exhaust oxygen content detector detects that the target value of oxygen content at the outlet is 5%.

[0011] Preferably, the specifications of the intake oxygen content detector and exhaust oxygen detector adopt three-wire system, ExdICT6, IP65, 0-25% v / v, 4-20ma.

[0012] Preferably, an intake pressure detector for detecting pressure is installed on the pipeline, and two intake pressure detectors are provided and installed between the intake oxygen content detector and the pressure / vacuum valve.

[0013] Preferably, the detonation-proof flame arrester is provided with temperature transmitters located in front of and behind the detonation-proof flame arrester, and the temperature transmitters are used to detect temperature.

[0014] Preferably, the detonation-proof flame arrester and the gas-liquid separator are both provided with a differential pressure transmitter, and the differential pressure transmitter is used to detect pressure.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are:

[0016] Through online monitoring of oil and gas pressure, temperature, flow, oxygen content and other parameters during the loading process, it plays the role of automatic self-inspection, automatic alarm and automatic protection. It can respond to abnormal oxygen content in time, keep in touch with the loading operation at the terminal, and leave a nitrogen inlet to prevent the oxygen content from exceeding the standard and carry out cleaning work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the ship-shore nitrogen replenishment device for the exhaust gas recovery device proposed in the utility model.

[0018] Legend: 1. Intake oxygen content detector; 2. Pressure / vacuum valve; 3. Gas-liquid separator; 4. Detonation-proof flame arrester; 5. Exhaust oxygen content detector; 6. Flame arrester cap; 7. Electric drain valve; 8. Intake valve; 9. Intake pressure detector; 10. Temperature transmitter; 11. Differential pressure transmitter. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] like Figure 1 As shown, the utility model provides a ship-shore nitrogen replenishing device for an exhaust gas recovery device, comprising a pipeline, a nitrogen pipe, and an intake oxygen content detector 1, a pressure / vacuum valve 2, a gas-liquid separator 3, a detonation-proof flame arrester 4 and an exhaust oxygen content detector 5 arranged on the pipeline. The intake oxygen content detector 1 is installed at the intake end, and the exhaust oxygen content detector 5 is installed at the outlet end of the pipeline. The intake end of the nitrogen pipe is connected to the nitrogen and the outlet end is connected to the gas-liquid separator 3. The pressure / vacuum valve 2 is installed between the intake oxygen content detector 1 and the gas-liquid separator 3, and the detonation-proof flame arrester 4 is installed between the gas-liquid separator 3 and the exhaust oxygen content detector 5.

[0022] In this embodiment, a flame arrester cap 6 is provided on the pressure / vacuum valve 2 , and an electric exhaust valve 7 is provided on the flame arrester cap 6 and the pressure / vacuum valve 2 .

[0023] In this embodiment, an air intake valve 8 is installed between the detonation-proof flame arrester 4 and the gas-liquid separator 3, and a self-operated pressure regulating valve and an electric regulating valve are provided on the nitrogen pipe. The air intake oxygen content detector 1 opens the electric regulating valve when the volume ratio of the oxygen content of the gas in the pipeline is higher than 6%, and the exhaust oxygen content detector 5 detects the target oxygen content at the outlet and alarms. When the volume ratio of the oxygen content in the pipeline is higher than 8%, the air intake valve 8 is closed and emergency discharge and chain alarm shutdown are implemented through the electric drain valve 7. The air intake valve 8 is automatically controlled and can be actuated after receiving a closing or opening indication signal. If the control signal is lost, it can be automatically closed and an alarm is triggered at the same time.

[0024] In this embodiment, the electric regulating valve adopts PID to adjust the nitrogen supplement amount, and the operating parameter of PID to adjust the nitrogen supplement amount adopts one of a proportional coefficient, an integral coefficient and a differential coefficient.

[0025] In this embodiment, nitrogen is introduced into the nitrogen pipe for inerting to ensure that the volume ratio of oxygen content at the outlet is lower than 8%. The exhaust oxygen content detector 5 detects a target value of oxygen content at the outlet of 5%.

[0026] In this embodiment, the specifications of the intake oxygen content detector 1 and the exhaust oxygen detector are three-wire, ExdICT6, IP65, 0-25% v / v, and 4-20ma.

[0027] In this embodiment, an intake pressure detector 9 for detecting pressure is installed on the pipeline. Two intake pressure detectors 9 are provided and installed between the intake oxygen content detector 1 and the pressure / vacuum valve 2. The range of the intake pressure detector 9 is 2.8kPa-11.2kPa. When it exceeds 11.2KPa, an alarm is issued and the pressure / vacuum valve 2 is opened to discharge.

[0028] In this embodiment, the detonation-proof flame arrester 4 is provided with temperature transmitters 10 located in front of and behind the detonation-proof flame arrester 4 . The temperature transmitters 10 are used to detect temperature.

[0029] In this embodiment, the detonation-proof flame arrester 4 and the gas-liquid separator 3 are both provided with a differential pressure transmitter 11 , which is used to detect pressure.

[0030] How to use and working principle of this device:

[0031] Through the operation and control of the programmable controller PLC, the intake oxygen content detector 1 detects the volume ratio of the oxygen content of the gas in the pipeline and is set to 6%. The exhaust oxygen content detector 5 detects the target value of the volume ratio of the oxygen content of the gas in the pipeline and is set to 5%. When the volume ratio of the oxygen content of the gas in the pipeline is higher than 6%, the electric control valve is opened and nitrogen is supplemented from the nitrogen pipe for inerting. The electric control valve is opened and the oxygen content is adjusted to meet the safety requirements through the PID operating parameters and diluted to the target value of the outlet oxygen content. When the volume ratio of the oxygen content is higher than 8%, the intake valve 8 is closed and the electric pressure relief valve is opened for emergency discharge, and the chain alarm is shut down.

[0032] Through online monitoring of parameters such as pressure, temperature, and oxygen content of oil and gas during the loading process, it plays the role of automatic self-inspection, automatic alarm, and automatic protection. It can respond to abnormal oxygen content in a timely manner, maintain linkage with the loading operation at the terminal, and leave a nitrogen inlet to prevent the oxygen content from exceeding the standard and carry out cleaning work, ensuring rapid shutdown in the event of an accident.

[0033] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any other form. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification, equivalent change and modification of the above embodiment made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. Nitrogen replenishing device for ship-shore use of waste gas recovery device, characterized in that: It includes a pipeline, a nitrogen gas pipe, an inlet oxygen content detector, a pressure / vacuum valve, a gas-liquid separator, a detonation arrestor, and an exhaust oxygen content detector provided on the pipeline. The inlet oxygen content detector is installed at the inlet end, and the exhaust oxygen content detector is installed at the outlet end of the pipeline. The inlet end of the nitrogen gas pipe is connected to nitrogen gas, and the outlet end is connected to the gas-liquid separator. The pressure / vacuum valve is installed between the inlet oxygen content detector and the gas-liquid separator, and the detonation arrestor is installed between the gas-liquid separator and the exhaust oxygen content detector.

2. The nitrogen replenishing device for ship-shore use of the waste gas recovery device according to claim 1, characterized in that: A flame arrester is provided on the pressure / vacuum valve, and an electric drain valve is provided on the flame arrester and the pressure / vacuum valve.

3. The nitrogen replenishing device for ship-shore use of the waste gas recovery device according to claim 2, characterized in that: An inlet valve is installed between the detonation arrestor and the gas-liquid separator. A self-operated pressure regulating valve and an electric regulating valve are provided on the nitrogen gas pipe. When the inlet oxygen content detector detects that the volume ratio of oxygen in the gas in the pipeline is higher than 6%, the electric regulating valve is opened. The exhaust oxygen content detector detects the target value of the oxygen content at the outlet and gives an alarm. When the volume ratio of oxygen in the pipeline is higher than 8%, the inlet valve is closed, and emergency discharge and interlock alarm shutdown are implemented through the electric drain valve.

4. The nitrogen replenishing device for ship-shore use of the waste gas recovery device according to claim 3, characterized in that: The electric regulating valve uses PID to adjust the nitrogen supplement amount, and the operating parameters for PID to adjust the nitrogen supplement amount are one of the proportional coefficient, integral coefficient, and differential coefficient.

5. The nitrogen replenishing device for ship-shore use of the waste gas recovery device according to claim 1, characterized in that: Nitrogen gas is introduced into the nitrogen gas pipe for inerting to ensure that the volume ratio of oxygen at the outlet end is lower than 8%. The exhaust oxygen content detector detects that the target value of the oxygen content at the outlet end is 5%.

6. The nitrogen replenishing device for ship-shore use of the waste gas recovery device according to claim 1, characterized in that: The specifications of the inlet oxygen content detector and the exhaust oxygen are three-wire system, ExdICT6, IP65, 0-25% v / v, 4-20 mA.

7. The nitrogen replenishing device for ship-shore use of the exhaust gas recovery device according to claim 1, characterized in that: An inlet pressure detector for detecting pressure is installed on the pipeline. Two inlet pressure detectors are provided and installed between the inlet oxygen content detector and the pressure / vacuum valve.

8. The nitrogen replenishing device for ship-shore use of the waste gas recovery device according to claim 1, characterized in that: Temperature transmitters are installed in front of and behind the detonation arrestor on the detonation arrestor. The temperature transmitters are used to detect temperature.

9. The nitrogen replenishing device for ship-shore use of the exhaust gas recovery device according to claim 1, characterized in that: Differential pressure transmitters are provided on both the detonation arrestor and the gas-liquid separator. The differential pressure transmitters are used to detect pressure.

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