BOILER HOUSE INSTRUMENTATION AND CONTROLS
Boiler House Instrumentation And Controls
Boilers are used in a broad range of industries such as electric power, pharmaceuticals, chemicals, ceramics, and paper and pulp. Amid the rising energy costs, tightening environmental regulations, and increasing awareness of safety as of late, the needs for high efficiency operation, low emission operation, and safe and stable operation of boilers are growing.
DRUM LEVEL MEASUREMENT
Overview and Problems
- Drum level measurement
- High stability measurement required under large static pressure change
Solution
- Field proven silicon resonant sensor guarantees long-term stability
- EJA: 0.1 % of URL 5 years
- EJX: 0.1 % of URL 10 years
- Under all conditions (temperature, static and over pressures)
Benefits
- Long term high stability measurement is realized under actual plant condition
COMBUSTION CONTROL
Overview and Problems
- Perform safe and stable control at low cost
- Lower levels of emission output
Solution
- Simple programming by Function Block wiring method
- Cascade primary direct control
– Stable level control when the boiler is started - Cross limit control calculation
– Air and flow are calculated so that air flow always exceeds fuel flow to prevent incomplete combustion and explosion - Feedforward control
– The mainstream pressure and feed water level are controlled quickly in response to changes in the mainstream flow
Benefits
- Reduced debugging time
- Improvement of the reliability of programs
- Safe and stable control at low cost
STEAM FLOW MEASUREMENT
Overview and Problems
- Flow measurement for utility steam
- Conventional orifice flowmeter requires complicated, high-cost installation and is not accurate
Solution
- Inline flowmeter
- Built-in temperature sensor, Tek-Vor 1300C MV
- Steam mass flow measurement without additional temperature sensor/transmitter and flow computer
- Accuracy 2 % of reading
Benefits
- Low installation and operational costs
- Safety operation to reduce leakage points
- Save energy by accurate measurement
COMBUSTION CONTROL
Overview and Problems
- O2control for optimum combustion of large-sized combustion equipment
- High installation cost for multipoint measurement
Solution
- Maximum 8 detectors can be connected to one AV550G converter
- O2measurement of multiple points, individual concentration, and average values
Benefits
- Accurate control by multipoint measurement
- Installation cost reduction
EXHAUST GAS ANALYSIS
Overview and Problems
- Air pollution control by continuous emissions monitoring
- High maintenance frequency
Solution
- Simultaneous measurement of up to five components, NOx, SO2, CO, CO2, O2
- Sample conditioning system designed to reduce maintenance
- No moving parts in the sensor
Benefits
- Accurate control by multipoint measurement
- Installation cost reduction