THIẾT BỊ ĐO LƯU LƯỢNG KHÓI GIÓ LÒ HƠI

BOILER COMBUSTION AIR/ GASES FLOWMETER

In almost coal-fired thermal power plants, accurate, responsive and reliable air fow measurement is critical to the automated control of the dampers and the effciency of the boiler, which also ensures safe operation of the boiler and reduces plant operation energy costs.

There are two main types: Pulverized Coal boilers (PC) and Circulating Fluidized Bed boilers (CFB).

1. Pulverized Coal boilers (PC)

In a pulverized coal (PC) boiler for a coal-fired power plant, controlling airflow is crucial for efficient combustion and maintaining operational stability. The main airflow locations that typically need to be controlled include:
– Primary air: PA fan (Primary air fan)
– Hot air: Heated and transporting pulverized-coal from the pulverizer mill to the burners.
– Cold air: sealing air to coal-feeder, adjust the coal temperature at the separator outlet, supply air to the sealing fan to get sealing air to pulverizer and mixed air damper.
– Secondary air: FD fan (Forced draft fan)
– Hot air: Supply oxygen for combustion in furnace, participate in adjusting the negative pressure of combustion chamber vacuum. Proper control of secondary air is critical for optimizing combustion and minimizing emissions.
– Cold air: Sealing air to the burners.
– Exhaust gas flow (Flue gas): Control the exhaust gas flow of the CEMS system.

2. Circulating Fluidized Bed boilers (CFB)

In Circulating Fluidized Bed (CFB) boilers, airflow is critical for maintaining the fluidization of the bed and ensuring efficient combustion. The key airflow locations that need to be controlled in CFB boilers are:

– Primary air flow: Need to control to create and maintain fluidized bed as well as balance fuel/air ratio according to design. This position is very important for the overall boiler efficiency.
– Secondary air flow (upper/lower): Controls the combustion efficiency of fuel in the combustion chamber.
– Cyclone/Loop seal inlet air flow: Controls the separation efficiency, fuel return of Cyclone, providing air to the loop seal..
– Coal-feed inlet air flow: Controls the air to insert and seal at the coal-feeder.
– Starting burner air flow, fuel oil: Controls and optimizes the starting combustion process with FO oil and fuel oil combustion when necessary at different loads.
– Ash-cooler air flow: Controls the ash cooling process, avoiding slag accumulation.
– Flue gas flow: Controls the exhaust gas flow of the CEMS system.

ST80 boiler air/ gases flowmeter

(Insertion type)

Origin: FCI- USA

ST80 is a high performance, rugged thermal dispersion technology air/gas flow meter that combines ultra-reliable, feature-rich electronics, and FCI innovations such as Adaptive Sensing Technology™ (AST™) with the industry’s most extensive selection of application-matched flow sensors, including FCI’s patented “S-style” sensor for boiler air/ gases and new “wet gas” flow element.

ST80 Features

Direct mass flow measuring (Nm3/hr, t/h, kg/h, kg/s,..)
Flow rate, totalized flow, temperature
No moving parts, virtually no maintenance
Patented AST™ thermal measuring mode
Process temperatures up to 850°F [454°C]
Analog outputs and bus communications
Global agency approvals for hazardous Ex installations
SIL 1 compliant
Graphical multivariable LCD readout
3-point in-situ calibration drift check
Exclusive wet gas/rain shield sensor option
Integral or remote mounting
Accuracy: ± 1.0% reading

ST102AA Dual-element boiler air/ gases flowmeter

(Insertion, dual-element averaging system)

Origin: FCI- USA

ST102AA is high performance dual-element averaging system, thermal dispersion technology gas flow meter that combines the most feature- and function- rich electronics, and innovations such as FCI patented Adaptive Sensing Technology™ (AST™), with the industry’s most advanced flow sensors such as FCI patented “S-style” flow element for boiler air/ gases flow and new “wet gas” sensor.

ST102AA Features

Direct mass flow measuring (Nm3/hr, t/h, kg/h, kg/s,..)
Flow rate, totalized flow, temperature
No moving parts, virtually no maintenance
Patented AST™ thermal measuring mode
Process temperatures up to 850°F [454°C]
Three (3) 4-20mA analog outputs and Modbus 485 communications
Global agency approvals for hazardous Ex installations
SIL 1 compliant
Graphical multivariable LCD readout
3-point in-situ calibration drift check
Onboard data logging to retractable 8GB micro-SD card
Integral or remote mounting
Accuracy: ± 0.75% reading

MT100 Multipoint Stack gas Flow Meters

Up to 8 points, high accuracy, best-in-class transmitter/electronics

Origin: FCI- USA

The MT100 Series is an insertion type, multipoint thermal flow meter specifically designed for large diameter pipes, such as stacks, industrial chimneys, and flues, and large rectangular ducts. FCI’s MT100 places up to eight (8) flow sensing points in the flow stream and averages them which results in a highly accurate and repeatable flow rate measurement.

MT100 Features

Direct mass flow measuring (Nm3/hr, t/h, kg/h, kg/s,..)
Main Transmitter/Electronics: Polished stainless steel, NEMA 4X/IP67
Readout / Display / Keypad: Large 7″ diagonal color LCD with touch-screen
Hazardous Ex installations: FM/FMc / ATEX/ IECE
Patented AST™ thermal measuring mode
Process temperatures up to 850°F [454°C]
Outputs: Two 4-20 mA, HART, frequency/pulse, Modbus 485, USB, Ethernet ports
Data Logger: Log to on-board 8 GB micro SD card/ CEMS test pass/fail status
CEMS Compliance (Optional): US-EPA CEM’s and EU AMS per EN 15267 (QAL1)
Flow Repeatability: ± 0.5% reading

ST75V/ ST75AV Hydrogen flowmeter

In-line, 1/4″ to 2″ [6 mm to 51 mm] line

Origin: FCI- USA

The ST75V/ ST75AV flow meter sensing element features precision, platinum RTD in small diameter, “equal-mass,” all-metal thermowells to provide superior accuracy, repeatability and fast response. Include Vortab^® flow conditioners built-in to the spool-piece to provide accurate and repeatable flow measurement installations with limited straight-run and/or for operating in transitional flow ranges

ST75 Features

Installation: In-line “T”, NPT or tube
Type: Thermal dispersion
Materials of Construction: All-welded 316SS probe element with Hastelloy-C22 thermowells;
Operating Pressure: Tube: 600 psig [ 41 bar(g)]
Enclosure: NEMA 4X, IP66, IP67
Output Signal: (2) 4-20 mA, (1) 0-500 Hz pulse for total flow, HART, Modbus RS485
Agency Approvals: ATEX, IECEx, FM/ FMc
Repeatability: ± 0.5% reading