Measurement of steam flow rates using a clamp-on ultrasonic flowmeter with various wetness fractions

2021 ◽  
pp. 101997
Author(s):  
Hideki Murakawa ◽  
Shuhei Ichimura ◽  
Katsumi Sugimoto ◽  
Hitoshi Asano ◽  
Shuichi Umezawa ◽  
...  
Keyword(s):  
Ultrasonic Flowmeter ◽  
Steam Flow ◽  
Flow Rates

Use of CFD to Improve Control Valve Effectiveness

2019 ◽  
Author(s):  
Alton Reich
Keyword(s):  
Flow Control ◽  
Control Valve ◽  
Steam Pressure ◽  
Steam Flow ◽  
Effective Control ◽  
Flow Control Valve ◽  
Flow Rates ◽  
Wide Range ◽  
Flow Through ◽  
Inlet Conditions

Abstract Control valves are used to adjust fluid flow rates in an extremely wide variety of applications. This paper discusses a steam flow control valve that is required to operate with a fairly wide range of inlet conditions (steam pressure) and provide effective control over a fairly wide range of steam flow rates. In this particular case a valve design was developed using “classical” methods — a combination of experience and hand calculations. The valve was tested and it did not provide adequate control over the flow for the application. The valve redesign effort used CFD to gain insight into the flow through the valve in order to evaluate control performance before the valve was fabricated and assembled. Several internal geometries were assessed and compared in order to identify two configurations that would meet the flow control requirements. These configurations were fabricated and tested and deemed to be adequate.

Evaluation of Transmitted Ultrasonic Signal for Measuring Steam Flow Rate Using Clamp-on Ultrasonic Flowmeter

2019 ◽  
Vol 2019 (0) ◽  
pp. OS11-02
Author(s):  
Shuhei ICHIMURA ◽  
Hideki MURAKAWA ◽  
Katsumi SUGIMOTO ◽  
Shuichi UMEZAWA ◽  
Katsuhiko SUGITA
Keyword(s):  
Flow Rate ◽  
Ultrasonic Signal ◽  
Ultrasonic Flowmeter ◽  
Steam Flow ◽  
Steam Flow Rate

Dynamic simulation study of the steam temperature in a ultra-supercritical circulating fluidized bed boiler system

2020 ◽  
pp. 095765092091530
Author(s):  
Seongil Kim ◽  
Sangmin Choi ◽  
Tae-Ho Song ◽  
Jari Lappalainen
Keyword(s):  
Fluidized Bed ◽  
Dynamic Simulation ◽  
Circulating Fluidized Bed ◽  
Steam Flow ◽  
Plant Performance ◽  
Steam Temperature ◽  
Cfb Boiler ◽  
Flow Rates ◽  
Fuel Flow ◽  
Load Change

A dynamic simulation of a modern ultra-supercritical circulating fluidized bed (USC-CFB) boiler system was performed using a physics-based model, where the boiler system was composed of an integrated system of heat exchanger (HEX) blocks. In each of the discretized elements of the HEX blocks, supercritical steam flow interacted with the solid–gas flow via heat transfer, and conservation laws, and physical phenomena of the CFB, and the supercritical steam flow was modeled to obtain the flow properties of each material side. By utilizing this model, the dynamic behavior of the main steam temperature, which was selected as the representative performance parameter for achieving safe and fast load changes, was simulated in response to changes applied to the main operating parameters such as the feedwater and fuel flow rates. The dynamic characteristics of the USC-CFB boiler were demonstrated by presenting the temperature responses of the steam and the circulating solid–gas after a step change in the feedwater and fuel flow rates. In the case of a load change, the dynamic response of the steam temperature was quantitatively presented by showing the transient overshoot and undershoot behavior, depending on the selection of the ramp speed when changing the feedwater and fuel flow rates. The steam temperature was also shown to be controlled by manipulating the inlet solid mass flow rate into the final superheater section of the external HEX. The comprehensive set of plant performance data that was generated from the model simulation can be utilized in setting up the operation strategies and/or in determining the control parameters for achieving stable steam temperature behavior during a load change.

Removal of Fluorides and Chlorides from Zinc Oxide Fumes by Microwave Sulfating Roasting

2015 ◽  
Vol 34 (6) ◽  
Author(s):  
Zhiqiang Li ◽  
Libo Zhang ◽  
Guo Chen ◽  
Jinhui Peng ◽  
Liexing Zhou ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Air Flow ◽  
Holding Time ◽  
Steam Flow ◽  
Flow Rates ◽  
Sulfating Roasting ◽  
Roasting Temperature

AbstractDechlorination and defluorination from zinc oxide dust by microwave sulfating roasting was investigated in this study. According to proposed reactions in the process, detailed experiments were systematically conducted to study the effect of roasting temperature, holding time, air and steam flow rates on the efficiency of the removal of F and Cl. The results show that 92.3% of F and 90.5% of Cl in the fume could be purified when the condition of the roasting temperature of 650 °C, holding time at 60 min, air flow of 300 L/h and steam flow of 8 ml/min was optimized. Our investigation indicates that microwave sulfating roasting could be a promising new way for the dechlorination and defluorination from zinc oxide dust.

Evaluation Method of Transmitted Signal for Clamp-on Ultrasonic Flowmeter in Measuring Wet Steam Flow

2019 ◽  
Vol 2019.24 (0) ◽  
pp. A221
Author(s):  
Hideki MURAKAWA ◽  
Shuhei ICHIMURA ◽  
Masaki SHIMADA ◽  
Katsumi SUGIMOTO ◽  
Shuichi UMEZAWA ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Ultrasonic Flowmeter ◽  
Steam Flow ◽  
Wet Steam ◽  
Transmitted Signal ◽  
Wet Steam Flow

scholarly journals Study on Measurement Error for Wet Steam Flow Rate using Clamp-on Ultrasonic Flowmeter

2020 ◽  
Vol 2020 (0) ◽  
pp. OS14-01
Author(s):  
Hideki MURAKAWA ◽  
Katsumi SUGIMOTO ◽  
Syuichi UMEZAWA ◽  
Masayuki IBI ◽  
Hirotoshi TAIRA ◽  
...  
Keyword(s):  
Measurement Error ◽  
Flow Rate ◽  
Ultrasonic Flowmeter ◽  
Steam Flow ◽  
Wet Steam ◽  
Steam Flow Rate ◽  
Wet Steam Flow

Measurement of steam flow rate using clamp-on ultrasonic flowmeter

2018 ◽  
Vol 2018 (0) ◽  
pp. OS4-8
Author(s):  
Shuhei ICHIMURA ◽  
Hideki MURAKAWA ◽  
Katsumi SUGIMOTO ◽  
Hitoshi ASANO ◽  
Shuichi UMEZAWA ◽  
...  
Keyword(s):  
Flow Rate ◽  
Ultrasonic Flowmeter ◽  
Steam Flow ◽  
Steam Flow Rate

Seawater deaeration at very low steam flow rates in the stripping section

Desalination ◽  
2006 ◽  
Vol 201 (1-3) ◽  
pp. 306-314 ◽  
Author(s):  
P. Costa ◽  
A. Ferro ◽  
E. Ghiazza ◽  
B. Bosio
Keyword(s):  
Steam Flow ◽  
Flow Rates

scholarly journals Effect of incident angle on ultrasonic transmission in steam flow for use with clamp-on ultrasonic flowmeter

2020 ◽  
Vol 7 (4) ◽  
pp. 20-00131-20-00131
Author(s):  
Hideki MURAKAWA ◽  
Shuhei ICHIMURA ◽  
Masaki SHIMADA ◽  
Katsumi SUGIMOTO ◽  
Hitoshi ASANO ◽  
...  
Keyword(s):  
Incident Angle ◽  
Ultrasonic Flowmeter ◽  
Steam Flow

scholarly journals Determination of Energy and Exergy of Syngas Produced from Air-steam Gasification of Wheat Straw in a Dual Distributer Fluidized Bed Gasifier

2019 ◽  
pp. 1-24
Author(s):  
Yaning Zhang ◽  
Abdel Ghaly ◽  
Samy S. Sadaka ◽  
Bingxi Li
Keyword(s):  
Total Energy ◽  
Wheat Straw ◽  
Fluidized Bed ◽  
Steam Gasification ◽  
Operating Conditions ◽  
Steam Flow ◽  
Flow Rates ◽  
Energy And Exergy ◽  
Fluidized Bed Gasifier

The energy and exergy of syngas produced from air-steam gasification of wheat straw in a dual-distributor fluidized bed gasifier under different operating conditions were evaluated. Three fluidization velocities (0.35, 0.40 and 0.45 m/s), 3 steam flow rates (0.20, 0.25 and 0.30 kg/min) and 3 biomass: steam ratios (3.00, 4.00 and 5.00 kg/kg) were investigated. The energy values of CO, H2, N2, CO2, CH4, C2H4 and C2H6 varied within the ranges of 1627.09-4646.60, 1543.30-2896.11, 274.75-1742.86, 82.03-574.24, 3225.39-4931.40, 1493.35-3777.44 and 892.74-2319.72 kJ/kg fuel, respectively. The overall energy distribution was (CH4 & CO & C2H4 & H2)>C2H6>(N2 & CO2). The results showed that when the fluidization velocity (FV) was increased from 0.35 m/s to 0.45 m/s (28.57%), the total energy of syngas increased by 1.16-28.59% depending on the steam flow rate (SFR} and biomass: steam ratio (B:S) used. Increasing the SFR from 0.20 kg/min to 0.30 kg/min (50.00%) decreased the total energy of syngas by 27.23-62.35% depending on the FV and B:S used. Increasing the B:S from 3.00 kg/kg to 5.00 kg/kg (66.67%) decreased the total energy of syngas by 11.86-37.33% depending on the FV and SFR used. The exergy values of CO, H2, N2, CO2, CH4, C2H4 and C2H6 were in the ranges of 1486.70-4224.40, 1183.82-2209.00, 60.26-677.26, 54.02-452.97, 2913.74-4448.38, 1404.76-3541.76 and 833.00-2156.42 kJ/kg fuel, respectively. The overall exergy distribution was (CH4 & CO)>(C2H4 & H2 & C2H6)>(N2 &CO2). When the FV was increased from 0.35 to 0.45 m/s(28.57%), the total exergy of syngas increased by 1.45-26.93% depending on the SFR and B:S used. Increasing the SFR from 0.20 kg/min to 0.30 kg/min (50.00%) decreased the total exergy of syngas by 26.78-63.26% depending on the FV and B:S used. Increasing the B:S from 3.00 kg/kg to 5.00 kg/kg (66.67%) decreased the total exergy of syngas by 10.32-36.07% depending on the FV and SFR used. The effect of SFR on the total energy and total exergy of syngas was the highest, followed by B:S and FV. The highest energy (20004.54 kJ/kg fuel) and exergy (16886.06 kJ/kg fuel) of syngas were obtained at the FV of 0.45 m/s, the SFR of 0.20 kg/min and the B:S of 3.00 kg/kg.

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