Application Background Printer Friendly Version
Geothermal electric power stations are generally been located where high temperature geothermal resources are available near the surface, often near areas where there are natural hot springs.
These power stations are a good energy source, harnessing the energy from hot steam however there are many issues relating to noxious gasses also emitted from geothermal springs and these need to be carefully monitored to minimise the impact on the environment. Hot springs have noxious gases venting into the atmosphere as well as the steam, and the weather plays an important part as well.
In addition to dissolved gases, hot water from geothermal sources may hold in solution trace amounts of toxic chemicals. These chemicals come out of solution as the water cools, and can cause environmental damage if released.
Plant construction can adversely affect land stability and the surrounding land scan also be monitored for seismic activity to ensure there is no change to the seismic data as a result of the Geothermal power station installation.
Firstly, there will be a requirement to monitor the weather in the area using Tier 2 weather station equipment to record the ambient conditions, especially wind speed and direction, so there is good knowledge of the general wind conditions to make sure emissions from the plant are not being carried by the wind to areas of population, such as a local town or city. There may be the need for one Tier 2 to be installed at the plant and at each perimeter fence of the facility to get a good reading for the local area.
Unidata supplies various weather station instruments, either a multifunction ultrasonic weather transmitter, which is very convenient to install, as well as separate discrete weather instruments. For this application, the simpler ultrasonic weather transmitter would most likely be the best choice for the application.
A Neon Remote Terminal can be connected to each weather station and be set up to read the instruments every minute, and store the raw and average readings every 5 minutes, and transmit the data to a central Neon Server every, say, 15 minutes
As well as weather station equipment to measure weather conditions such as wind speed, direction, humidity, temperature, solar radiation etc., there would also be a requirement to add additional instruments to measure the presence of noxious gases and to also seismic activity
There are many manufacturers of gas monitoring equipment. One such manufacturer is Draeger and there are sensors to measure noxious gases such as CO, CO2, NO, H2S, SO2 as well as O2 and N.
These instruments typically provide a 4-20mA analog output or a Modbus output which can be read by Neon Remote Terminal or Module routinely, perhaps every minute and then routinely send the data to the Neon Server every 15 minutes.
The system could also be equipped with a ground seismic monitor to take daily readings of seismic activity so a clear pattern of the base level of activity can be determined, and then use that base level to see if there are any local area changes to that activity as a result of any different load levels / different operation patterns for the Geothermal Power Station.
The Neon Remote Terminal scheme / program can also be set up to check parameters each minute and raise an alarm and an immediate transmission to the Neon Server in the event of any reading is outside its preset limits. The Neon Server can also be set up with alarm actions, to notify staff by email or text, with an escalation process, of any out of limits conditions.
As well as the immediate actions to deal with for high / dangerous gas levels, data can be analyzed and long term trends can be determined to minimise environmental impacts and optimize production.
Finally, water quality measurements for any outflows can be important, so a water quality instrument on any outflows would allow outflows to be checked for quality, to maintain environmental compliance. These instruments can also be connected with a Neon Remote Terminal to the central Neon Server, either with a radio link, or by connecting directly into the plant network using an Ethernet cable.
|Options for Application Specific Instruments / Inputs||Unidata Part Number||Description|
|Drager Gas Detection Instruments||Drager MiniWarn||CO2/CO Gas Monitor|
|Vaisala Weather Transmitter WXT536||6501V-H||Vaisala Weather Transmitter measure barometric pressure, humidity, precipitation, |
temperature and wind speed and direction
|Temperature Thermistor Probes||6507E||Red Thermistor Probe 3K@25C with requested cable lengths|
|Precision Temperature Probes||6507D||Robust Thermistor Probe 0.1C with requested cable lengths|
|Linear Temperature Probe||6535A||Temperature Probe LM34 with requested cable lengths|
|Humidity and Temperature Probe||6539B||Humidity and Temperature Probe|
|Rain Gauge||6506C||Rain Gauge/Tipping Bucket|
|Mounting Arrangement for Temperature Probes||6704A||Radiation Gill Screen and Mounting - Full Size|
|Mounting Arrangement for Temperature Probes||6704B||Radiation Gill Screen and Mounting - Half Size|
|Radiation Sensor||7241C-A||Pyranometer Sensor – Solar Energy|
|Mounting Arrangement for Pyranometers||7241M||Pyranometer Sensor Instrument Mounting and Hardware|
|Four Electrode Conductivity Instrument||6536E||4EL Water Conductivity Instrument|
|Four Electrode Water Conductivity Probe||6536P-2-X||4EL Water Conductivity Probe with 10m, 20m, 30m or 50m of cable|
|Options for Neon Telemetry - NRT / RTU / Field Units||Unidata Part Number||Description|
|Cellular RTU 3G||2013F-AB03||Neon Metering Module 3G with Antenna and Li Battery|
|Cellular RTU 4G||2013F-AB04||Neon Metering Module 4G with Antenna and Li Battery|
|Cellular RTU 3G - Industrial||2016F-AB03||Neon Remote Terminal 3G with Antenna and Li Battery|
|Cellular RTU 4G - Industrial||2016F-AB04||Neon Remote Terminal 4G with Antenna and Li Battery|
|Low Earth Orbit Satellite Globalstar||2015E-AB0||Neon Remote Terminal - Satellite Globalstar Modem with Antenna and three Li Batteries|
|Ethernet||2017E-0B0-1 or 3||NRT Ethernet with single or triple Ethernet Ports|
with three Li Batteries
|Equatorial Orbit Satellite - Inmarsat||2018E-AB0-1 or 3||NRT Ethernet with single or triple Ethernet Ports|
with three Li Batteries
|LCD Display||2500E||NRT LCD Display|
|NRT Field Termination Strip||2103F||2015E,2016F,2017E, and 2018E NRT FTS|
|NRT Firmware Option||2303A-8M||8M Extended Memory Option|
|NRT Firmware Option||2303A-8M-CAM||8M Extended Memory & Serial Camera Option|
|NRT Firmware Option||2303A-CAM||Serial Camera Option|
|Options for Neon Application Software - Customer Server||Unidata Part Number||Description|
|Neon Application Software||2302A||Neon Server Software Licence Incl 5 NAL |
|Neon Application Software||2302A-10||Additional 10 NRT Access Licences|
|Neon Application Software||2302A-20||Additional 20 NRT Access Licences|
|Neon Application Software||2302A-50||Additional 50 NRT Access Licences|
|Options for Neon Application Software - Unidata Server||Unidata Part Number||Description|
|Neon Application Software||2301A||Neon Data Initial Subscription Setup Fee|
|Neon Hosting Service||2301A-01||Neon Data Service Fee for 1-50 NRTs|
|Neon Hosting Service||2301A-02||Neon Data Service Fee for 51-100 NRTs|
|Neon Hosting Service||2301A-10||Neon Data Service Fee Metering|
|Options for Conventional Dataloggers / Field Units||Unidata Part Number||Description|
|Standards Starlogger||6004D-11||Red Logger 512K with Alkaline Battery|
|Display Starlogger||6004D-21||Blue Logger 512K with LCD and Alkaline Battery|
|Prologger||7001D-11||Green Logger 1M with LCD and Alkaline Battery|
|Starlogger Field Termination Strip||6103E||6004D FTS|
|Prologger Field Termination Strip||7100E||7001D FTS|
|Starlog V4 Management Software||6308A-AUE||Starlog V4 Full Licence Key|