NI assisted thermal power plant CMS-1000 combustion status monitoring system

CMS-1000 system

"By using NI modular instruments and software, we can significantly reduce the time required to adjust a device while creating a more user-friendly interface without sacrificing measurement accuracy."

-Jordan Pritt, Turbine Technology Services CorporaTIon

challenge:

When the gas turbine combustor is operating at a fuel-air ratio close to the lower flammability limit, it is necessary to minimize possible destructive pressure oscillations to avoid accelerated wear, flame flashback, or lean oil flameout.

solution:

Using NI hardware and NI LabVIEW software to develop a portable combustion status monitoring system, so that we can accurately adjust and debug unstable combustion status.

background

Many power plant operators have experienced damage caused by unstable turbine frequencies. The Dry Low NOx (DLN) combustion chamber designed to meet the current strict emission standards must work at a very low fuel-air ratio. Because the fuel-air ratio is very close to the lower flammability limit, the DLN combustion chamber is prone to dynamic pressure oscillations, resulting in accelerated wear of component interfaces or direct damage to the hardware; flame flashback in the pre-mixing area can cause The melting of other combustion chamber hardware; or the flameout may cause the steam turbine to trip out of line. In order to protect the long-term working components and ensure the integrity of the work under the premise of meeting the emission standards, the DLN system needs to be regularly commissioned and maintained.

CMS-1000 system

In order to avoid accelerated wear and mechanical damage of important components in the turbine, we developed a combustion status monitoring system using NI hardware and LabVIEW software, making the debugging of the turbine relatively easy. This CMS-1000 combustion status monitoring system is compact and can monitor the pressure of each combustion chamber in the steam turbine. For different types of steam turbines, we can monitor the dynamic pressure in up to 18 combustion chambers. There is a monitoring box on each side of the turbine. Each monitoring box receives half of the signal input. The sensor cable is taken out from each combustion chamber and then connected to the dynamic pressure sensor in any monitoring box.

In addition to the built-in pressure sensor, the monitoring box is also equipped with a damping coil as a signal compensation system, which can eliminate the attenuation of the sensor signal line. In addition, the NI 9234 dynamic signal acquisition (DSA) module is installed in the monitoring box. The analog signal generated by the pressure sensor is output to the NI I / O module and NI cDAQ-9188 chassis in each monitoring box. By setting up NI hardware and software, synchronous data collection can be achieved between the two monitoring boxes. The collected dynamic pressure signal is transmitted to a laptop computer located in the local control room of the steam turbine via the NI MES-3980 industrial Ethernet switch.

The LabVIEW program performs fast Fourier transform on the 18 pressure signals to obtain the frequency spectrum (pressure amplitude vs. frequency) of each combustion chamber. The post-processing of these spectrums provides critical amplitude and frequency data to help decision makers make turbine tuning plans. The spectrum and post-processed data can be displayed in a variety of graphs to help engineers more easily and quickly decide how to control the steam turbine fuel and air in real time. Various data record formats can also help engineers write documents and generate reports based on the results of adjustments.

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