In the Pulverized Coal Boiler, the coal pipes layout are varies and each coal pipes has a different length and layout to the burner.
With the nature of flow loss and resistance, the coal flow will be uneven distributed among different pipe levels to the burner.
However, without a visibility to monitor the coal flow and coal velocity online or continuously, the plant user could not optimize the coal flow balancing.
Due to the change of coal feed supply, the characteristic of coal would varies, i.e. from Bituminous to Subbituminous or low rank, the moisture level, the coal quality will be different.
as such, the operation will need to conduct boiler tuning as soon the coal feed changes. The schedule range from monthly or quarterly even or longer.
often the existing operation only have the portable dirty air flow sensor, which can only measure the air flow velocity, which is in-sufficient.
In order to address this, TECG provides the Online Coal Flow Monitoring and Balancing Solution.
TECG Control offers the unique coal flow measurement system.
The Advanced Coal Flow System is especially developed to measure pulverized coal distribution to each burner. This helps balance particulate coal amount in order to avert combustion issues caused by high LOI results.
Massflow Meter is a microwave based mass flow transmitter. The electronic is mounted in the sensor head.
The wave guide is made of stainless steel. It is leading the microwave into the pipe. In the front is an antenna that is protected by a special wear protection ceramic.
The sensor transmits at a specific frequency. The microwave reflected from the single particles is measured and analysed by a patented algorithm and converted into a flow proportional signal.
The flow meter offers several interfaces to transmit the measurement: galvanic isolated 0/4..20mA, pulse output, or Modbus communication.
The system is drift free and independent from pressure and temperature in a wide range. The system is drift free and independent from pressure and temperature operation in a wide range.
The software runs on the embedded PC integrated in the acquisition unit. It can store the data for at least one year of continuous running. also provide a visualization package that displays the flow and coal flow distribution in bar graphs and a continuous line recorder.
It also offers a software tool to communicate with each connected sensor for monitoring and diagnostic function.
After Balancing – coal mass flow difference below 10%
TECG Control also provide the Purposed Design – COAL Diffusing Valve for the coal flow balancing. It can effective reduce the coal roping effect and balance the coal flow for different burners.
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