JP2013204582A - Calorie measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a calorie measurement device that prevents a value indicated in a calorie meter from slightly varying due to the influence of exhaust gas pressure.SOLUTION: A calorie measurement device 1 including a plurality of calorie meters 10 each measuring calorie of a fuel gas, a plurality of supply lines for supplying a part of the fuel gas to the plurality of the calorie meters 10, and a plurality of exhaust gas pipes 50 connected to the plurality of the calorie meters 10, respectively. Exhaust ports 52 for the plurality of the exhaust gas pipes 50 are independently opened.

Description

  The present invention relates to a calorie measuring device for measuring the calorie of fuel gas used for controlling a gas turbine in a power plant.

  Conventionally, a calorimeter is used for gas turbine control in a power plant. The calorimeter measures the calorie of the fuel gas, and the measurement result is used to adjust the amount of air supplied to the combustor of the gas turbine equipment. That is, the control device of the gas turbine acquires the measurement value of the calorimeter, and corrects the amount of air supplied to the combustor according to the change in the calorie of the fuel gas.

  Further, as this type of conventional technique, there is a technique described in Patent Document 1. In Patent Document 1, the calorimeter measures the calorific value of the fuel gas mixed with boil-off gas, and based on the measured value of the calorimeter, the flow rate adjustment valve is opened for the required time and the required opening, A heat increasing gas or a heat reducing gas, which is a gas, is supplied to the calorific value adjusting device. A technology is disclosed in which, when a calorific value variation occurs, the calorific value adjusting device supplies a calorific value adjusting gas to a fuel gas flowing in a pipe and adjusts to a required fuel gas calorific value and composition.

  By the way, normally, three calorimeters are installed, and an intermediate value of these three calorimeters is used for gas turbine control. The gas that has passed through the three calorimeters is released into the atmosphere through a common collecting tube.

  In addition, equipment for supplying calibration gas to each of the three calorimeters is provided, and the calorimeter is calibrated by supplying calibration gas to the calorimeter one by one in regular inspection.

JP 2002-188460 A

  However, conventionally, in the regular inspection, calibration gas is supplied to each calorimeter, but at this time, the exhaust pressure of the calibration gas passing through the calorimeter is slightly higher than the exhaust pressure of the fuel gas, The exhaust pressure of the collecting pipe will increase. Due to the change in the exhaust pressure, the indicated values of other calorimeters that have not been calibrated change slightly. If the indicated value of the calorimeter changes, the amount of air supplied to the combustor changes, which may affect gas turbine control.

  An object of the present invention is to provide a calorie measuring apparatus that solves such problems and prevents a calorimeter indicating value from changing delicately due to a change in exhaust pressure.

  In order to achieve the above object, the present invention has the following configuration.

  (1) A plurality of calorimeters for measuring the calories of fuel gas, a plurality of supply lines for supplying a part of the fuel gas to each of the plurality of calorimeters, and each of the plurality of calorimeters A calorie measuring device comprising a plurality of exhaust lines, wherein the exhaust ports of the plurality of exhaust lines are independently opened.

  According to (1), since the exhaust ports of the plurality of exhaust lines are independently opened, the numerical value measured by the plurality of calorimeters is not affected by the flow rate of the fuel gas flowing through the other calorimeters, and is accurate. Can measure the calories.

  (2) The calorie measuring device according to (1), wherein the exhaust ports of the plurality of exhaust lines are at positions spaced apart from each other and all face the same direction.

  According to (2), since the directions of the exhaust ports in the plurality of exhaust lines are all the same, the gas from one exhaust line does not enter the other exhaust line. Thereby, the exhaust gas in the exhaust line does not affect the exhaust pressure in the other exhaust lines.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the calorie measuring apparatus which prevented that the indication value of the calorimeter changed delicately by the change of exhaust pressure.

It is explanatory drawing which shows the structure of the calorie measuring apparatus 1 in one Embodiment of this invention. It is explanatory drawing which shows the structure of the conventional calorie measuring apparatus 1 of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory diagram showing a configuration of a calorie measuring device 1 according to an embodiment of the present invention. The calorie measuring apparatus 1 includes a calorimeter 10, a main pipe 20, a manual valve 22, a main pressure reducing valve 24, a fuel gas supply pipe 30 corresponding to a supply line, a first cock valve 31, and a pressure reducing valve 32. The second cock valve 33, the flow rate adjusting valve 34, the flow meter 35, the calibration gas supply unit 40, and the exhaust gas pipe 50 corresponding to the exhaust line are provided.

  The calorimeter 10 is for measuring the calorie of the fuel gas, and the calorimeter 1 is provided with three calorimeters 10. An intermediate value in these three calorimeters 10 is used for gas turbine control.

  The main pipe 20 is connected to a fuel gas mother pipe 100 and introduces a part of the fuel gas flowing through the mother pipe 100. The main pipe 20 is provided with a manual valve 22, and a main pressure reducing valve 24 is provided downstream thereof.

  The manual valve 22 is a valve that manually opens and closes the main pipe 20. The main pressure reducing valve 24 is an automatic valve that lowers the flow pressure of the fuel gas from the mother pipe 100 and sends the fuel gas downstream while keeping the low pressure constant.

  The fuel gas supply pipe 30 is a pipe connected between the main pipe 20 and the calorimeter 10, and three fuel gas supply pipes 30 are connected to the main pipe 20. The fuel gas supply pipe 30 includes a first cock valve 31, a pressure reducing valve 32, a second cock valve 33, a flow rate adjusting valve 34, and a flow meter 35 in this order from the main pipe 20 side to the calorimeter 10 side. Is provided.

  The first cock valve 31 and the second cock valve 33 are valves that open and close the fuel gas supply pipe 30. The pressure reducing valve 32 is an automatic valve that lowers the flow pressure of the fuel gas from the main pipe 20 and sends the fuel gas downstream while keeping the low pressure constant. The flow rate adjusting valve 34 adjusts the flow rate of the fluid (fuel gas, calibration gas) flowing through the calorimeter 10. The flow meter 35 measures the flow rate of the fluid (fuel gas, calibration gas) flowing through the calorimeter 10.

  The calibration gas supply unit 40 supplies calibration gas to the fuel gas supply pipe 30, and includes a zero gas supply pipe 41, a zero gas needle valve 42, a calibration gas cylinder 43 filled with zero gas, and a span gas supply pipe 44. , A span gas needle valve 45 and a calibration gas cylinder 46 filled with the span gas. Here, zero gas is a fuel gas having a caloric value set as a reference, and span gas is a fuel gas having a higher caloric value than zero gas.

  The zero gas supply pipe 41 is a pipe connecting the calibration gas cylinder 43 and the fuel gas supply pipe 30. The zero gas supply pipe 41 is provided with a zero gas needle valve 42. Supply or non-supply of the zero gas in the calibration gas cylinder 43 to the fuel gas supply pipe 30 is determined by opening and closing the zero gas needle valve 42.

  The span gas supply pipe 44 is a pipe that connects the calibration gas cylinder 46 and the fuel gas supply pipe 30. The span gas supply pipe 44 is provided with a span gas needle valve 45. Supply or non-supply of the span gas of the calibration gas cylinder 46 to the fuel gas supply pipe 30 is determined by opening and closing the span gas needle valve 45. The zero gas supply pipe 41 and the span gas supply pipe 44 are connected between the second cock valve 33 and the flow rate adjusting valve 34 in the fuel gas supply pipe 30.

  The exhaust gas pipe 50 is a pipe that discharges the gas used for calorie measurement in the calorimeter 10, and the gas used for calorie measurement is released into the atmosphere from an exhaust port 52 at the tip of the exhaust gas pipe 50. An exhaust gas pipe 50 is connected to each of the three calorimeters 10, and exhaust ports 52 corresponding to the three calorimeters 10 are independent from each other. Further, the exhaust ports 52 in the three exhaust gas pipes 50 are located at positions separated from each other, and the directions of the exhaust ports 52 are all the same.

  When the calorimeter 10 performs calorie measurement of fuel gas, the manual valve 22, the first cock valve 31, and the second cock valve 33 are opened, and the zero gas needle valve 42 and the span gas needle valve 45 are closed. A part of the fuel gas flowing through the mother pipe 100 is supplied to the three calorimeters 10. At this time, the worker adjusts the flow rate adjusting valve 34 while looking at the flow meter 35 so that the flow rate in the three calorimeters 10 becomes a prescribed flow rate. And the three calorimeters 10 transmit a measurement result to the control apparatus which controls a gas turbine.

  When calibrating the calorimeter 10 during periodic inspection, the fuel gas supply of the calorimeter 10 to be measured is started from the state in which a part of the fuel gas flowing through the mother pipe 100 is supplied to the three calorimeters 10. The first cock valve 31 and the second cock valve 33 provided in the pipe 30 are closed. Then, zero gas is supplied to the calorimeter 10 by opening the needle valve 42 for zero gas. At this time, the flow rate adjusting valve 34 is adjusted while looking at the flow meter 35 so that the zero gas has a prescribed flow rate. Then, the indication value of the calorimeter 10 is adjusted so as to become an indication value corresponding to zero gas. Next, the zero gas needle valve 42 is closed and the span gas needle valve 45 is opened to supply the span gas to the calorimeter 10. At this time, the flow rate adjusting valve 34 is adjusted while looking at the flow meter 35 so that the span gas has a prescribed flow rate. Then, adjustment is made so that the indicated value of the calorimeter 10 becomes the indicated value corresponding to the span gas. The calorimeter 10 calibrates the indicated value by proportional calculation based on the adjusted two values.

  When the calibration of the calorimeter 10 to be measured is completed, the worker closes the span gas needle valve 45, opens the first cock valve 31 and the second cock valve 33, and supplies the calorimeter 10 with the calorie of the fuel gas. Resume measurement. Then, the next calorimeter 10 is calibrated.

Here, as a reference, the configuration of a conventional calorie measuring apparatus will be described with reference to FIG.
When comparing the conventional calorie measuring apparatus 1 shown in FIG. 2 with the calorie measuring apparatus 1 of the present embodiment shown in FIG. 1, the conventional calorie measuring apparatus 1 shown in FIG. 2 includes one collecting tube 60. It differs from the calorie measuring device 1 of this embodiment shown in FIG.

  Exhaust gas pipes 50 extending from the three calorimeters 10 are connected to the collecting pipe 60, and exhaust gases from the three calorimeters 10 are collected by the collecting pipe 60 and released into the atmosphere from one outlet 62. Is done.

  Thereby, as described above, in the regular inspection, the calibration gas is supplied to the calorimeter 10 for each unit. At this time, the calibration gas (zero gas and span gas) is more than the exhaust pressure when the fuel gas is supplied. Since the exhaust pressure when supplying is slightly high, the exhaust pressure of the collecting pipe 60 is increased. Due to the change in the exhaust pressure, there is a possibility that the indication value of the other calorimeter 10 that has not been calibrated may slightly change.

  On the other hand, according to the present embodiment, since the exhaust ports 52 of the plurality of exhaust gas pipes 50 are opened independently, the gas discharged from the calorimeter 10 being calibrated affects the exhaust pressure of the other calorimeters 10. No longer give. For this reason, the indication value of the other calorimeter 10 that has not been calibrated does not change slightly.

  As described above, according to the present embodiment, since the exhaust ports 52 of the plurality of exhaust gas pipes 50 are opened independently, the numerical values measured by the three calorimeters 10 are the other calorimeters 10. Because it is not affected by the flow rate of the gas flowing through, it becomes possible to measure accurate calories.

  In addition, since the exhaust ports 52 in the three exhaust gas pipes 50 are at positions separated from each other and all face the same direction, the gas from one exhaust gas pipe 50 enters the other exhaust gas pipes 50. Therefore, the exhaust pressure of other exhaust gas pipes 50 is not affected.

DESCRIPTION OF SYMBOLS 1 Calorie measuring apparatus 10 Calorimeter 20 Main piping 22 Manual valve 24 Main pressure reducing valve 30 Fuel gas supply piping 31 1st cock valve 32 Pressure reducing valve 33 2nd cock valve 34 Flow control valve 35 Flowmeter 40 Calibration gas supply part 41 Zero gas Supply pipe 42 Zero gas needle valve 43, 46 Calibration gas cylinder 44 Span gas supply pipe 45 Span gas needle valve 50 Exhaust gas pipe 52 Exhaust port 60 Collecting pipe 62 Exhaust port 100 Mother pipe

Claims (2)

Multiple calorimeters that measure the fuel gas calories,
A plurality of fuel gas supply pipes for supplying a part of the fuel gas to each of the plurality of calorimeters;
In a calorie measuring device comprising a plurality of exhaust lines connected to each of a plurality of calorimeters,
A calorie measuring apparatus, wherein the exhaust ports of the plurality of exhaust lines are opened independently.   2. The calorie measuring apparatus according to claim 1, wherein the exhaust ports of the plurality of exhaust lines are at positions separated from each other and all face the same direction.

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