Environmental & Energy Industry Gas Detection Solutions: Nexisense Empowering Clean Production and Emission Compliance

In the environmental and energy sector, such as thermal power plants, waste incineration, biomass power generation, industrial boilers, and desulfurization and denitrification facilities, flue gas treatment has become a core environmental requirement. Desulfurization (FGD), denitrification (SCR/SNCR), and dust removal processes involve multiple gases, including ammonia (NH₃, used as a denitrification reducing agent), hydrogen sulfide (H₂S), nitrogen oxides (NOx), sulfur dioxide (SO₂), carbon monoxide (CO), ozone (O₃), and volatile organic compounds (VOCs). If these gases leak or exceed emission limits, they not only threaten operator health but also intensify atmospheric pollution and may even cause secondary environmental hazards or safety accidents.

National standards for fixed pollution source emissions are becoming increasingly stringent (such as the “Emission Standard of Air Pollutants for Thermal Power Plants” GB 13223 and the “Standard for Pollution Control on Municipal Solid Waste Incineration” GB 18485), requiring real-time continuous monitoring of key pollutants and networking with environmental protection platforms. Establishing a reliable online gas monitoring system has become an essential measure for environmental and energy enterprises to achieve ultra-low emissions and green transformation.

Nexisense focuses on industrial-grade gas detection technology, providing complete solutions from single-point sensors to full-process monitoring systems, helping enterprises achieve accurate monitoring, timely warnings, and efficient linkage under complex flue gas environments.

Core Challenges and Necessity of Environmental & Energy Gas Monitoring

Gas monitoring in environmental and energy processes faces multiple challenges:

• Complex gas types: involving toxic (NH₃, H₂S, CO), corrosive (SO₂, NOx), and reactive gases (ozone, VOCs), requiring different sensing principles.

• Harsh environments: high temperature, high humidity, high dust, and corrosive flue gas demand extremely high equipment durability.

• Compliance pressure: emission data must be uploaded to environmental authorities in real time; exceeding limits triggers penalties.

• Safety risks: ammonia leakage as a reducing agent or accumulation of combustible components in exhaust gas may lead to poisoning or explosions.

Effective monitoring enables early leak detection, process optimization (such as ammonia injection control), reduction of ammonia slip, and ensures compliant exhaust emissions, balancing environmental protection and economic benefits.

How to Select Gas Detection Equipment for Environmental & Energy Applications?

Selection should comprehensively consider target gases, measurement range, installation environment, and system integration:

• Clarify monitoring targets: NH₃ and NOx are key in denitrification processes; SO₂ in desulfurization; comprehensive exhaust monitoring includes CO and O₂.

• Range and accuracy: NH₃ 0–100 ppm; SO₂/NOx 0–2000 mg/m³, meeting CEMS standards.

• Protection level: high-temperature probe (resistant to 800℃+), anti-corrosion housing, IP66 or above.

• Output interfaces: 4–20mA, RS485 Modbus RTU, convenient for PLC/DCS or environmental networking.

• Reliability: imported sensors + temperature and humidity compensation algorithms ensure accurate data.

Ignoring these factors may result in large drift, slow response, or frequent maintenance, affecting compliance.

Nexisense Core Product Lines

Nexisense has developed multiple adapted products for environmental and energy scenarios.

Online Fixed Gas Detector — SGA-500 Series

This industrial-grade online detector adopts original imported sensor chips, combined with a 32-bit microprocessor and 24-bit high-precision ADC, achieving full-range temperature and humidity compensation and patented algorithm optimization. Plug and play, powered by 24V, displays real-time concentration and automatically alarms at preset thresholds.

Key Advantages:

• Supports electrochemical, infrared, catalytic combustion and other sensor types, covering NH₃, H₂S, SO₂, NOx, CO, etc.

• Triple protection design (high concentration overload protection, misoperation prevention, lightning protection), suitable for Zone 1/2 hazardous areas.

• High-brightness LCD display for intuitive on-site reading.

(Image example: Nexisense SGA-500 online gas detector installed near industrial pipelines)

Pollution Source VOC Online Monitoring System — SGA-900 Series

Specially designed for exhaust VOCs and boiler NOx, equipped with high-temperature sampling probe, high-efficiency pretreatment (dust and moisture removal), supporting continuous automatic monitoring. Data can be directly transmitted to environmental platforms, enabling unattended compliance management.

Suitable for waste incineration and coal-fired boilers, ensuring VOC and NOx compliance.

(Image example: schematic diagram of online monitoring equipment in flue gas desulfurization and denitrification process)

Alarm Controller and System Integration

The SGA-800 series controller supports multi-channel (4/8/16 channels), unified power supply and concentration display of each point. When exceeding limits, it triggers sound and light alarms and links fans, valves, or spray systems through relays.

The detector output signal easily connects to PLC, DCS, or CEMS systems, forming closed-loop control: ammonia slip exceeding limits automatically adjusts ammonia injection; SO₂ abnormalities trigger process optimization.

(Image example: Nexisense multi-channel gas alarm controller panel showing real-time concentration)

Installation Location and Specification Guidelines

Installation location directly affects response speed and accuracy. Nexisense recommends the following principles:

• Gases heavier than air (such as SO₂, H₂S, CO): install 30–60 cm below the leakage source to capture settling gas.

• Gases lighter than air (such as NH₃, H₂): install above the leakage source or 30–60 cm below the highest point.

• Horizontal distance: toxic gases not exceeding 1 m; combustible gases not exceeding 7.5 m.

• Oxygen: can be installed upper or lower, recommended 30–60 cm.

• Notes: avoid vents, direct sunlight, and rain; use shielded cables (3-core/4-core), corresponding to S+, V+, V- or S-/GND terminals.

Proper installation allows detectors to capture signals at the early stage of gas diffusion, gaining valuable response time.

Typical Application Scenarios

• Thermal power/boiler desulfurization and denitrification: monitor NH₃ slip, SO₂, NOx to ensure SCR/SNCR efficiency.

• Waste incineration plants: online monitoring of exhaust VOCs, CO, HCl, linked with environmental CEMS.

• Biomass energy: CH₄ and H₂S monitoring in biogas to prevent leakage and explosion.

• Post-industrial dust removal: boundary VOC and ozone monitoring to evaluate diffusion impact.

  
  

Frequently Asked Questions (FAQ)

1. What gases does the Nexisense SGA-500 series mainly monitor in environmental and energy applications? Does it support multi-gas combinations?
The series covers key environmental gases: NH₃ (0–100/200 ppm), H₂S (0–100 ppm), SO₂ (0–2000 mg/m³), NO/NO₂/NOx (0–2000 mg/m³), CO (0–1000 ppm), O₃, VOCs, etc. A single unit provides high-precision monitoring for one gas; for composite needs, four-in-one or multi-sensor customized versions are available.

2. Is the equipment suitable for high-temperature, high-humidity, and high-dust flue gas environments? How about protection and durability?
Yes. The SGA-900 series is equipped with an 800℃ high-temperature sampling probe and high-efficiency pretreatment unit (cyclone dust removal + condensation dehumidification). The housing features anti-corrosion and explosion-proof design up to Ex d IIC T6 Gb. Sensors are optimized with temperature and humidity compensation algorithms for long-term stability.

3. How to ensure data meets environmental networking and CEMS requirements? What communication protocols are supported?
Supports 4–20mA and RS485 Modbus RTU protocols, seamlessly connecting to PLC/DCS or CEMS hosts. The SGA-900 series integrates direct transmission modules compatible with HJ/T75 and HJ 212 standards, enabling minute-level uploads and over-limit alarms.

4. What are the special requirements for monitoring ammonia (NH₃) slip as a denitrification reducing agent?
Ammonia slip control below 3–5 ppm is crucial. Electrochemical sensors are recommended, range 0–50/100 ppm, response time <30 s. Install at the SCR reactor outlet or before the chimney, linked with ammonia injection pumps for closed-loop optimization.

5. What is the sensor lifespan and calibration cycle? Is maintenance costly?
Electrochemical sensors (NH₃, SO₂, NOx) last 2–3 years; infrared types (CO₂, CH₄) over 5 years. Built-in lifespan prediction and drift self-diagnosis; calibration every 6–12 months. Nexisense provides remote diagnostics with low total ownership cost.

6. Can wireless solutions be used for retrofitting old environmental facilities? How about transmission stability and security?
Supports LoRa or 4G wireless modules, suitable for chimneys and tank areas with difficult wiring. LoRa covers several kilometers, AES-128 encryption + heartbeat mechanism ensures reliable data. Signal surveys are recommended for optimal deployment.

7. Is the system linkage logic flexible? Can it achieve multi-level alarms and zoned control?
Supports multi-level thresholds (pre-alarm/alarm/high-high alarm), each independently linked (e.g., level 1 starts fan, level 2 reduces ammonia injection, level 3 stops furnace). Multiple relay groups + logic configuration meet complex flue gas process control needs.

8. How to obtain detailed technical materials, 3D models, or project cases? How long is the quotation process?
Submit gas types, working conditions, and number of points via the official website; preliminary plan within 24 hours. Provide full manuals (selection tables, installation drawings, explosion-proof certificates), 3D models, and case layouts. Standard products quoted within 1–3 working days; customized or bulk within 5–10 working days.

Conclusion: Nexisense Empowering Green Upgrade in Environmental & Energy Sector

Environmental and energy transformation relies on precise gas monitoring. With reliable sensor technology, industrial-grade design, and flexible integration capability, Nexisense provides full-chain support from leak warning to emission compliance. Whether for new environmental facilities or upgrading existing systems, efficient matching solutions are available.

If your project involves flue gas treatment or exhaust monitoring, contact the Nexisense team for customized selection advice, site survey, and technical support. Clean production starts with reliable monitoring.