Method for continuous measurement of dynamic fluid consumption
A method for continuous measurement of the dynamic fluid consumption of a consumer by use of a two-way flow sensor, particularly the measurement of gaseous or liquid fuel, and possibly a conditioning device, whereby the pressure is reduced to a constant exit pressure downstream from the flow sensor. A minimum quantity of fluid is fed through the pressure regulator at any desired time whereby fluid is continuously returned in variable quantities from the region of constant exit pressure to the region between the flow sensor and the pressure regulator to make possible a continuous, accurate and timely highly defined consumption measurement with controlled exit pressure for the fluids using an open system which is able to maintain pressures in the entire line system even at highly dynamic consumption changes and which does not allow the formation of a multiphase flow. The device for to carrying out the method is provided with a pressure control device downstream from the flow sensor and a connecting line with a pump leading from the region behind the pressure control device to the region between the flow sensor and the pressure control device.
1. A method for continuously measuring dynamic fluid consumption of a consumer, comprising the steps of:
(a) supplying a flow of fluid through a flow sensor so as to flow downstream in a line from the flow sensor to a consumer, said flow sensor continuously detecting an actual measured value of fluid flow and fluid consumption,
(b) passing the fluid through a pressure regulator downstream of the flow sensor and upstream of the consumer to reduce fluid pressure to a constant pressure in the line between the pressure regulator and the consumer,
(c) supplying part of the fluid to the consumer, and
(d) continuously returning fluid from the flow of fluid downstream of the pressure regulator and upstream of the consumer to the flow of fluid between the flow sensor and the pressure regulator.
2. The method according to claim 1 , comprising adjusting a temperature of the fluid returned in step (d) to a nearly constant value.
3. The method according to claim 1 , including removing bubbles from the flow of fluid downstream of the pressure regulator.
4. The method according to claim 1 , wherein the flow of fluid in step (a) derives from an air relief tank.
5. An apparatus for continuously measuring dynamic fluid consumption of a fluid consumer, comprising
a fluid delivery line which is connected to a fluid consumer,
a first pump for supplying fluid to said fluid delivery line so as to flow in a downstream direction to the fluid consumer,
a flow sensor in said fluid delivery line, said flow sensor continuously detecting an actual measured value of fluid flow and fluid consumption,
a pressure regulator in said fluid delivery line downstream of said flow sensor,
a first return line which extends from the fluid consumer to the fluid delivery line downstream of the pressure regulator, and
a second return line which extends from the fluid delivery line downstream of the pressure regulator to the fluid delivery line between the flow sensor and the pressure regulator, said second return line including a second pump for continuously returning fluid in variable quantities.
6. The apparatus according to claim 5 , including a third pump in the fluid delivery line downstream of the pressure regulator.
7. The apparatus according to claim 5 , including a bubble separating device in the fluid delivery line downstream of the pressure regulator and upstream of the first return line.
8. The apparatus according to claim 5 , including a heat changer in the fluid delivery line downstream of the pressure regulator.
9. The apparatus according to claim 8 , including a temperature sensor in said fluid delivery line downstream of the pressure regulator.