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Guarding the Energy Hub: Nexisense Gas Detection and Safety Protection Solutions for the Power Industry
As the power source of modern industry, the power industry's production safety and environmental emissions have always received high attention. From traditional thermal power generation to modern high-voltage power transmission and distribution, gas monitoring is not only related to the safety of operators but is also the key to achieving "Net Zero Emissions" and long-term stable equipment operation.
Leveraging its deep foundation in sensing technology, Nexisense has tailored a one-stop gas detection system for power enterprises, ranging from end-of-pipe treatment monitoring to power transmission and distribution environmental safety.
Key Gas Monitoring Scenarios in the Power Industry
In modern power plants and substations, gas monitoring requirements are mainly concentrated in three dimensions: production process optimization, personnel safety protection, and environmental compliance.
1. Ammonia (NH3) Safety Monitoring in Denitrification Processes
To eliminate nitrogen oxides (NOx) in flue gas, thermal power plants commonly use SCR or SNCR denitrification technologies, where liquid ammonia is stored and used in large quantities as a reducing agent. Liquid ammonia is highly irritating and toxic; once a leak occurs, it not only poses a health hazard but can also trigger serious accidents. Nexisense's ammonia monitoring systems are deployed around ammonia storage tanks, unloading areas, and evaporators to achieve 24-hour early warning.
2. Flue Gas Emission Monitoring (CEMS Auxiliary Systems)
During the combustion process, thermal power plants produce carbon monoxide (CO), carbon dioxide (CO2), sulfur dioxide (SO2), and various nitrogen oxides (NO, NO2). Nexisense's pretreatment detection system can sample and purify flue gas with high humidity and high dust, working with high-precision sensor modules to provide reliable data support for enterprise environmental emission reduction.
3. GIS Switchroom and SF6 Insulation Monitoring
Sulfur hexafluoride (SF6) has excellent insulation and arc-extinguishing properties and is widely used in high-voltage switchgear. However, SF6 is a potent greenhouse gas and produces toxic decomposition products during discharge failures. Additionally, SF6 is dense and tends to accumulate in low-lying areas, causing potential suffocation. Nexisense's SF6 + Oxygen (O2) monitoring solution is standard equipment for substation operation and maintenance.
Nexisense Core Products: Power-Grade High-Reliability Architecture
Designed for the complex environments of power plants characterized by high temperature, high humidity, and strong electromagnetic fields, Nexisense's product series have reached the industrial peak in durability and accuracy.
Pretreatment Gas Detection System
Gases in the power industry are often accompanied by condensed water and particulates. Nexisense's sampling pretreatment system integrates automatic drainage, multi-stage filtration, and constant temperature control technology to ensure that the gas entering the sensor chamber is dry and clean, significantly increasing sensor lifespan and measurement accuracy.
SGA Series: Intelligent Sensor Modules
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Multi-parameter Integration: Can simultaneously monitor various factors such as $NH_3$, $NO_x$, and $SO_2$, supporting modular expansion.
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Anti-interference Design: Circuit shielding is specifically designed for the strong magnetic environments of power plants to ensure signal transmission is not disturbed by electromagnetic pulses from large current and high-voltage equipment.
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Plug and Play: Modules feature built-in factory calibration parameters. On-site maintenance does not require returning the unit to the factory, greatly lowering the technical threshold for power plant O&M personnel.
Industry Benchmarks: Nexisense Facilitating Smart Power Construction
Nexisense's solutions have been successfully applied in multiple large power groups and pilot platforms:
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Power Generation Group Applications: Guangdong Yuedian Group, Foshan Nanhai Power Plant, and other units utilize Nexisense online monitoring systems for round-the-clock monitoring of ammonia leaks in denitrification areas.
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Local Grids and Energy Companies: Dalian Ganjizi Power Plant and Nanjing Nandian Group achieved refined analysis of flue gas components by deploying Nexisense pretreatment systems.
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Power Testing and Research: Professional institutions such as Hubei Zhongshi Power use Nexisense high-precision sensor modules for power equipment fault diagnosis and environmental safety assessments.
FAQ: In-depth Q&A for Power Industry Gas Detection
| Question | Nexisense Professional Answer |
|---|---|
| Q1: How to choose the range for ammonia monitoring in the denitrification area? | A1: Ammonia monitoring is usually divided into "leakage alarm" and "slip monitoring." For safety protection in ammonia storage and unloading areas, a range of 0-50ppm or 0-100ppm is suggested to capture low-concentration signals early. For "ammonia slip" in flues, professional laser or pretreatment systems are required. Nexisense SGA-500 series offers customized ranges with accuracy up to 0.1ppm. |
| Q2: Why monitor both SF6 and Oxygen in SF6 switchrooms? | A2: SF6 is colorless, odorless, and heavier than air, accumulating at the bottom and displacing oxygen, leading to suffocation. Toxic byproducts also form during faults. Nexisense recommends a "SF6+O2" dual solution. If SF6 exceeds limits or O2 drops below 19.5% VOL, the system links to exhaust fans to ensure safety before personnel entry. |
| Q3: Flue gas environments are harsh; how does Nexisense prevent sensor damage? | A3: Flue gas is humid, corrosive, and hot. Nexisense uses an extractive pretreatment solution rather than direct exposure. We use heated sampling lines to prevent $SO_2$ absorption by condensation, followed by multi-stage hydrophobicity and fine filtration to deliver dry, room-temperature gas to the SGA module, extending sensor life by 3-5 times. |
| Q4: How are NO and NO2 handled in NOx detection? | A4: NOx in emissions consists of NO and some NO2. Nexisense modules support dual-channel collection or utilize a high-performance NOx converter to unify the gas for measurement, ensuring total NOx data complies with national environmental standards. |
| Q5: How do Nexisense detectors communicate with existing DCS systems? | A5: Our fixed detectors come standard with industry-standard RS485 Modbus RTU protocols, allowing direct connection to mainstream DCS (like Siemens, HollySys). We also support 4-20mA analog output and provide LoRa or 5G wireless options for modern smart plants. |
| Q6: What equipment is needed for confined spaces (e.g., cable tunnels, boiler interiors)? | A6: Maintenance personnel must use the Nexisense SGA-600 series pump-suction portable detector. It should be configured as a 4-in-1 or 5-in-1 device to monitor Combustible Gas (Ex), Oxygen (O2), Carbon Monoxide (CO), and Hydrogen Sulfide (H2S) in real-time before and during entry. |
| Q7: How is zero drift in SF6 detectors resolved? | A7: For SF6, Nexisense uses NDIR (Non-Dispersive Infrared) technology, which offers superior zero-point stability compared to electrochemical sensors. Additionally, our systems feature automatic calibration to perform intelligent zeroing in background air, effectively avoiding false alarms. |
| Q8: Are there special rules for ammonia detector installation height? | A8: Ammonia (NH3) has a molecular weight of 17, lighter than air (~29). Nexisense suggests installing detectors 0.5m-2m above the potential leak source. However, in extremely cold regions or under high-pressure spray where ammonia forms a cold mist, the height must be optimized based on airflow. |
Technical Summary: Professional Parameters and Standards
Nexisense power industry solutions strictly implement the following technical specifications:
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Communication Protocols: Modbus RTU, 4-20mA, HART, Wireless LoRa.
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Protection Levels: Detectors feature IP66 explosion-proof ratings; pretreatment cabinets support IP55 or higher.
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Measurement Indicators: $NH_3$ (0-50/100ppm), $SF_6$ (0-1000/3000ppm), $O_2$ (0-25% VOL).
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Environmental Adaptability: Pretreatment systems support flue gas temperatures up to $400^circ C$ (with front-end cooling); host operating temperature $-20^circ C sim 50^circ C$.
Conclusion:
Every ignition and every kilowatt-hour sent by the power industry requires a precise safety foundation. Through high-sensitivity sensing cores and mature system integration experience, Nexisense is deeply involved in the construction of green power and smart grids.
