KURZ Thermal mass flowmeters aimed to improve combustion efficiency. AUTOMATION INSTRUMENTATION SUMMIT July 4th 2018 Gianantonio Favalessa

Transcription

1 KURZ Thermal mass flowmeters aimed to improve combustion efficiency AUTOMATION INSTRUMENTATION SUMMIT July 4th 2018 Gianantonio Favalessa

2 Ital Control Meters srl

3 Ital Control Meters srl Year of constitution: 1993 Headquarter in Carate Brianza Process instrument & analysis Products sales & field services

4 Ital Control Meters srl

5 Ital Control Meters srl

6 Ital Control Meters srl Categories of distributed products Macro areas of activity

7 Ital Control Meters srl Not only products but also technical services

8 Air and flue gas flow measurement Monitoring and control of combustion air and flue gas up to emission

9 Air and flue gas flow measurement Let s talk about combustion: Combustion is a chemical reaction of exothermic type (with release of energy) between fuel and oxidizer. Oxidizer is normally oxigen from air (combustion air).

10 Air and flue gas flow measurement Combustion efficiency: Ratio between fuel and oxidizer is the key for an optimal combustion efficiency that means an efficient fuel consumption and reduction of emission to environment. This ratio changes with fuel type (i.e. 14,7:1 for gasoline or 9,53:1 for CH4 and 2,38:1 for H2). Accurate and efficient measurement of combustion air is a main key for an efficient combustion.

11 Air and flue gas flow measurement Accurate and reliable measurement of combustion air means: Ratio increase between produced energy and use of fuel Reduction of harmful emissions from stack to environment So we need to pay more attention to the air flowmeter selection

12 Air and flue gas flow measurement Air flowmeters: Several available technologies on the market from years: dp (averaging pitot tube, venturi, orifice plate, ), ultrasonic (probe or cross stack), turbine, vortex, coriolis, optical scintillation correlation. We know all of them with advantage and disadvantages but the most interesting technology for industrial plant in order to measure combustion air, often in critical condition, from our experience is the thermal mass flowmeter of KURZ Instrument Inc.

13 Thermal from KURZ 40 years of experience in thermal mass flow Headquarter in Monterey CA (USA) Distributed in Italy from over 25 years KURZ key arguments: Sensor design for extreme conditions CT (constant temperature) technology Multi point concept K-BAR2000B WGF the first thermal sensor for wet gas QAL1 EN14181 and certification

14 Thermal from KURZ CT (Constant Temperature) thermal mass flow meter, measuring principle: Reference Sensor (process) Velocity Sensor (heated) One RTD measures the process temperature and a second RTD is heated to higher temp As gas flows by it pulls heat away from the heated sensor skin, the electronics increase current flow to maintain a constant differential The current flow (power delivered to the heated sensor) directly relates to the gas mass flow rate (do not need external P and T compensation)

15 Thermal from KURZ The right sensor is kept at a constant temperature difference against the left sensor. Gas flows along the heated sensor and takes the heat away. The more molecules are passing, the more heat is taken away, the more power is needed to maintain the temperature difference. The amount of power is proportional with the flow

16 Thermal from KURZ Main feature of a KURZ thermal mass flow meter: Direct mass flow measurement without extra sensors and calculation Wide measure dynamics starting from zero flow (CT technique) Can be used also below ambient pressure with negligible pressure drop Fast reaction time (CT technique) suitable for process control loop High temperature version up to 500 C with high accuracy VTM feature ATEX for Ex area installation SIL 1 for safety application QAL1 for emission monitoring

17 Thermal from KURZ In 2014 KURZ developed and patented an exclusive technique that allows the use of a thermal sensor for measurement of wet gas WGF (Wet Gas Flow) uses the Leidenfrost effect and a specific high temperature technique to grant stable and accurate flow measure in condensing gas environment, impossible for other thermal mass flowmeters.

18 Thermal from KURZ Already in years 90 KURZ developped a multipoint thermal mass flow meter to answer the problem of not totally developped flow profile.

19 Thermal from KURZ Flow profile changes with stack geometry but also with flow velocity. With K-BAR2000B we can install more sensors and more probes as it is needed And we can also apply a dynamic flow compensation sensor by sensor to match flow profile changes

20 Thermal from KURZ Suitable for application up to 500 C (932 F) Designed for accuracy under any flow condition Perfect for uneven velocity flow profiles Fast response to velocity and temperature changes (less than 1 sec) Exceptional turn-down characteristics Unsurpassed low-flow sensitivity (start from zero flow) Single and multi-point, each sensor with independent microprocessor, 4-20 ma, modbus, Profibus and Hart outputs Resistant to dirt, moisture or corrosion No moving parts, low maintenance cost Easy Installation for all kind of ducts or stacks Suitable for combustion air but also flue gas and emission acc. QAL1

21 Thermal from KURZ Probe removed after about 10 years in the stack The sensitive areas of the sensor are perfectly clean KURZ sensors can perform efficiently in dirty environments

22 Thermal from KURZ Application example Combustion air: Primary air control Big rectangular duct Multipoint system

23 Thermal from KURZ Application example Stack emission: Suitable also for low flow All stacks size CEMS acc QAL1

24 Thermal from KURZ

25 Advanced flow measurement