초록 ▼

A flow body flow meter includes a flow body and a sensor having one or more probes in the flow body. As a wet gas stream enters the flow body, an internal passage imparts angular momentum to the stream to induce a rotating flow. The wet gas stream at least intermittently carries liquid phase particl

A flow body flow meter includes a flow body and a sensor having one or more probes in the flow body. As a wet gas stream enters the flow body, an internal passage imparts angular momentum to the stream to induce a rotating flow. The wet gas stream at least intermittently carries liquid phase particles and the inertia of the denser liquid phase particles separates them from the rotating flow. The probes of the sensor are located in a part of the rotating flow that is free of any liquid phase particles. The internal passage may include an axial swirler and a cylindrical section downstream from the axial swirler. The axial swirler imparts the nonlinear motion to the stream, and tips of the probes are located near a center axis of the cylindrical section so they are free of any liquid phase particles.

대표청구항 ▼

1. A flow measurement system for a duct, comprising: a flow body flow meter receiving a wet gas stream from a larger wet gas stream in the duct, the flow body flow meter comprising: a sensor having one or more probes in a flow body, wherein the one or more probes are in a path of the wet gas stream;

1. A flow measurement system for a duct, comprising: a flow body flow meter receiving a wet gas stream from a larger wet gas stream in the duct, the flow body flow meter comprising: a sensor having one or more probes in a flow body, wherein the one or more probes are in a path of the wet gas stream;the flow body, comprising: a lateral inlet about a first end of the flow body, the inlet receiving the wet gas;an internal passage, comprising: an axial swirler downstream from the inlet, the axial swirler providing a rotational path imparting angular momentum to the wet gas stream to induce a rotating flow; anda cylindrical section downstream from the axial swirler, one or more tips of the one or more probes being located near a center axis of the cylindrical section and away from an interior wall of the cylindrical section; anda lateral outlet about a second end of the flow body, the outlet returning the wet gas stream from the flow body back into the duct, wherein the flow body is mounted at the first or the second end to an inner wall of the duct. 2. The system of claim 1, wherein the wet gas stream at least intermittently carries liquid phase particles, and the angular momentum of the wet gas stream forces the denser liquid phase particles to the periphery, and the one or more probes of the sensor are located in a part of the flow body that is free of any liquid phase particles. 3. The system of claim 1, further comprising the duct, wherein the inlet points substantially into a flow direction of the larger wet gas stream. 4. The system of claim 3, wherein the outlet points substantially away from the flow direction, and the flow body is mounted normal to the inner wall at a point along a duct circumference so the inlet is higher than the outlet. 5. The system of claim 3, wherein the duct is vertical, the flow body is mounted normal to the inner wall, and the outlet points substantially away from the flow direction. 6. The system of claim 1, wherein the axial swirler is selected from the group consisting of angled partitions extending from a central hub, a twisted band in the flow body, and a helical channel comprising a surface that spirals around an annular space between a central hub and an inner wall of the flow body. 7. The system of claim 1, wherein the internal passage further comprises a narrowing section downstream from the axial swirler and upstream from the cylindrical section. 8. The system of claim 1, wherein: the flow body comprises an outer cylinder around an inner cylinder, the outer cylinder defining the inlet, the inner cylinder defining the internal passage and the outlet, and the outer cylinder and the inner cylinder being connected by an opening; andthe internal passage further comprising a narrowing section downstream from the axial swirler and upstream from cylindrical section. 9. The system of claim 1, further comprising a purge system periodically injecting a purge stream into the flow body at one of the inlet, upstream of the axial swirler, downstream of the axial swirler, or at the outlet. 10. The system of claim 1, further comprising: another flow body flow meter in the duct, the other flow body flow meter comprising another sensor; anda support rod inserted at least partially into the duct, the support rod supporting the flow body flow meter and the other flow body flow meter. 11. The system of claim 10, further comprising an electronic controller coupled to receive signals from the sensor and the other sensor to obtain an average property within the duct. 12. The system of claim 1, wherein the sensor is a thermal anemometer sensor. 13. A flow body flow meter to be fitted to a duct, the flow body flow meter measuring a wet gas stream that at least intermittently carries liquid phase particles, the flow body flow meter comprising: a flow body, comprising: a lateral inlet about a first end of the flow body, the lateral inlet pointing substantially into a flow direction of the wet gas stream in the duct;an internal passage downstream from the lateral inlet, the internal passage comprising: an axial swirler imparting angular momentum to the wet gas stream to induce a rotating flow;a narrowing section downstream from the axial swirler;a cylindrical section downstream from the narrowing section; andan elbow downstream from the cylindrical section; anda lateral outlet downstream from the elbow and about a second end of the flow body, the lateral outlet pointing substantially away from the flow direction of the duct, wherein the flow body is mounted at the first or the second end normal to an inner wall of the duct; anda sensor comprising one or more probes extending axially from the first or the second end into the cylindrical section, wherein one or more tips of the one or more probes are located near a center axis of the cylindrical section and away from an interior wall of the cylindrical section.