1、 Industry background and demand analysis

The petrochemical industry, as a technology intensive field, has production facilities with characteristics such as high temperature and high pressure, flammability and explosiveness, and toxicity and harm. According to statistics,2019According to data from the State Administration of Work Safety, the proportion of fires and explosions caused by combustible gas leaks in accidents in the petrochemical industry exceeds60%Poisoning and suffocation accidents caused by toxic gas leaks have long been among the top occupational hazards. With the transformation of the industry towards intelligence and greenness, traditional monitoring methods can no longer meet the needs of real-time, accuracy, and scalability. Based onTCP/IPThe industrial Ethernet technology of the architecture has become the core support for building a gas monitoring system for the entire plant area due to its openness, compatibility, and high-speed transmission capability.

IITCP/IPArchitectural technology advantages

1) Compatibility and real-time data transmission

through supportHTTPTheFTPTheSMTPBy following standard protocols, devices from different vendors can be seamlessly integrated to achieve cross platform data sharing, while data transmission efficiency is much higherRS485,A single switch can support256Number of detection nodes, coverage radius extended to2Kilometers to meet the needs of large factory areas.

2) Cost effectiveness and maintainability

Compared to traditional fieldbus,TCP/IPArchitecture is achieved through standardized hardware (such asMOXA NportSeries serial port servers enable serial device networking, reducing30%Wiring cost. Remote management function supports throughWebInterface orSSHProtocol parameter configuration reduces annual maintenance hours for a certain enterprise400Hour by hour, the efficiency of fault location is improved70%.

3、 System architecture design

1. TCP/IParchitecture system

2. Selection of key equipment

Detection terminal:

ATheNGPGCombustible gas detector: range0～100%LELAccuracy ±3%FS

BTheNGPGHydrogen sulfide gas detector: range0～100ppmAccuracy ±3%FS

CTheNGPGAmmonia gas detector: range0～100ppmAccuracy ±3%FS

DTheNGPGCarbon monoxide gas detector: range0～1000ppmAccuracy ±3%FS

ETheNGPGOxygen detector: range0～25%VOLAccuracy ±3%FS

FTheNGPGTemperature and humidity detector: temperature range-20℃～80℃, humidity range0%RH～100%RH

ETheNGPGPressure detector: Range: Optional based on actual pipeline pressure

ETheNGPGCommunication control box: controls the fan (on or off); Control solenoid valve (open or close); Control the water pump (on or off); Control barrier gate (open or close); Control access control (opening or closing); Control water gates (open or close), etc

Transmission equipment:

A、Adopting industrial grade fiber optic switches, supporting ring network function, adapting to-40℃~75℃ wide temperature environment.

B、NGPGData acquisition gateway, supporting serial port acquisition and supporting multiple protocols throughLAN（4G）Data transmission method requires local transmissionUIAccess and data query functions.

Monitoring platform:

A、Hardware category:X86Architecture Server（CPUsupport16nucleus32Threads, memory support64GBAbove), installationLinuxsystem andSQL serverdatabase

B、Software category: InstallationNGPGSystem level application platform, supporting simultaneous use by multiple platforms, protocols, and users, and self customizedUIMulti page display. And it can also have functions such as engineering backup