JPH05322607A - Steam flow meter - Google Patents

Abstract

PURPOSE:To obtain a steam flow meter which can determine heat transmission efficiency of a steam heater easily without requiring any additional flow meter for an object to be heated. CONSTITUTION:A steam heater 1 is coupled with a steam supply pipe 10 provided with a steam flow meter 3, a steam pressure sensor 8, and a steam temperature sensor 9. The steam heater 1 is also coupled with a pipe 12 for supplying the object to be heated and a pipe 15 for taking out the object to be heated which are provided, respectively, with temperature sensors 13, 16. The steam heater 1 is coupled, on the secondary thereof, with a condensate delivery pipe 20 provided with a steam trap 7. The steam flow meter 3, the pressure sensor 8, and the temperature sensors 9, 13, 16 are connected with an operating section 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam flow meter capable of measuring the passing flow rate of steam which is heated and dried by various devices. In the steam heating device, a steam flow meter is installed on the inlet side of the device in order to grasp the amount of steam consumed. It is general that dust, scales, rust, etc. contained in the steam adhere to the heating surface of the steam heating device with the lapse of its use time, and the heat transfer efficiency to the object to be heated is reduced. When the heat transfer efficiency decreases, a large amount of steam heat amount, which is more than a predetermined amount, is required to perform the predetermined heating, and the productivity per unit energy decreases, and heat transfer unevenness to the object to be heated causes production quality to deteriorate. I will come.

[0002]

2. Description of the Related Art In order to reliably detect a decrease in heat transfer efficiency in a conventional steam heating device, the pressure and temperature of steam supplied to the steam heating device, the steam flow rate, and the temperature before and after heating the object to be heated. And by measuring the amount of the object to be heated. That is, the amount of heat supplied to the object to be heated is converted from the pressure, temperature and steam flow rate of the supplied steam, and the decrease in heat transfer efficiency was detected depending on how many times the temperature of the object to be heated increased due to this amount of supplied heat. is there.

[0003]

SUMMARY OF THE INVENTION In the above conventional one,
A flow meter for measuring the amount of the object to be heated is required separately from the steam flow meter, and the apparatus cost is high to detect the heat transfer efficiency, and the apparatus configuration is complicated.

Therefore, a technical object of the present invention is to provide a steam flow meter capable of detecting a change in heat transfer efficiency of a steam heating device with a simple structure at a low cost without providing a separate flow meter for a heated object. Is to get.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems comprises a steam flow rate detecting means and a steam pressure temperature detecting means for detecting the pressure and temperature of steam. In the flow meter arranged on the inlet side of the Nari steam heating device, the heat quantity of steam passing through the flow meter is calculated by the signals from the steam flow rate detecting means and the steam pressure temperature detecting means, and the temperature of the object to be heated is detected. The heating object temperature detecting means is provided, and the calculating part for calculating the heat transfer efficiency of the steam heating device from the heat quantity of steam and the temperature of the object to be heated is provided.

[0006]

The operation of the above technical means is as follows.
The object to be heated is heated by the steam supplied to the steam heating device through the flow meter. The amount of heat supplied to the steam heating device is converted by the pressure, temperature and flow rate of the steam. Also,
The temperature on the inlet side and the temperature on the outlet side of the heated object to the heating device are detected by the heated object temperature detecting means. When the supply amount of the object to be heated is constant, the heat transfer efficiency can be easily converted by dividing the difference between the outlet side temperature and the inlet side temperature of the object to be heated by the supply heat amount. Further, the heat transfer efficiency can be similarly converted in a simple manner by dividing the supplied heat amount by a value obtained by subtracting the average value of the inlet side temperature and the outlet side temperature of the object to be heated from the steam temperature. By constantly measuring the flow rate of steam and measuring the change in heat transfer efficiency when the amount of material to be heated is the specified amount, it is possible to detect the adhesion state of foreign matter on the heating surface of the steam heating device, that is, heat transfer efficiency. ,
By properly performing cleaning or the like, the heat transfer efficiency of the device can be maintained within a desired range.

[0007]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). A steam supply pipe 10 for supplying steam is connected to the steam heating device 1, and the steam supply pipe 10 is sequentially connected to the steam supply pipe 10.
A steam flow meter 3 and a pressure sensor 8 and a temperature sensor 9 as a steam pressure temperature detecting means are attached. On the secondary side of the steam heating device 1, a condensate outlet pipe 20 for connecting the condensate generated in the steam heating device 1 is connected, and a steam trap 7 for automatically discharging the condensate that has flowed down is attached. The steam trap 7 is not always necessary if the amount of condensed water generated in the steam heating device 1 is constant. The steam flow meter 3, the pressure sensor-8, and the temperature sensor-9 are connected to the computing unit 6, respectively. Further, an object-to-be-heated supply pipe 12 for supplying the object-to-be-heated is connected to the steam heating device 1 through a valve 14 and a temperature sensor 13 as a temperature detecting means for the object-to-be-heated inlet side, and the object-to-be-heated is also heated. A take-out pipe 15 for taking out is connected via a temperature sensor 16 on the outlet side of the object to be heated. The temperature sensors 13 and 16 are also connected to the arithmetic unit 6.

The steam flow meter 3 may be of any known type, but an orifice type or Karman vortex type flow meter is suitable. Similarly, as the pressure sensor-8, the temperature sensor-9 and the like, conventionally known ones can be used.

On the primary side of the flow meter 3 of the steam supply pipe 10, a control valve 11 for adjusting the amount of supply steam and a separator 22 for separating steam in the steam supply pipe 10 and condensate are provided.
Station for discharging the condensate separated by the separator 22 to the outside of the system
A trap 23 is provided.

Next, the operation will be described. The object to be heated in the steam heating device 1 is latently heated by the steam supplied from the steam supply pipe 10 and taken out from the object to be heated take-out pipe 15. The amount of steam supplied is measured by the steam flow meter 3.
The steam deprived of the heat by the latent heating is condensed and discharged through the steam trap 7 attached to the secondary side of the steam heating device 1 to the outside of the system. Steam flow meter 3 and pressure sensor
8, temperature sensor-9, and heated object temperature sensor-13,
The respective signals from 16 are input to the arithmetic unit 6. The calculation unit 6 calculates the heat quantity of the steam supplied to the steam heating device 1 from the steam flow rate, the steam pressure and the temperature, and calculates the average value of the inlet side temperature and the outlet side temperature of the object to be heated or the outlet side temperature and the inlet side temperature. The side temperature difference is calculated. Further, in the calculation unit 6, a value obtained by dividing the temperature difference between the outlet side temperature and the inlet side temperature of the object to be heated by the steam heat quantity or subtracting the average value of the inlet side temperature and the outlet side temperature of the object to be heated from the steam temperature. The heat transfer efficiency of the heating device 1 can be easily obtained by dividing the steam heat quantity by the method when the supply amount of the object to be heated is substantially constant.

[0011]

As described above, according to the present invention, in order to detect the heat transfer efficiency of the steam heating device, a flow meter for separately detecting the supply amount of the object to be heated is not required, and the cost of the device is low. It is possible to obtain a steam flow meter having a simple structure.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a steam heating device using a steam flow meter of the present invention.

[Explanation of symbols]

 1 Steam heating device 3 Steam flow meter 6 Calculation unit 8 Steam pressure sensor-9 Steam temperature sensor-10 Steam supply pipe 11 Control valve 12 Heated object supply pipe 13 Heated object inlet side temperature sensor-15 Heated object take-out pipe 16 Heated object outlet side temperature sensor

Claims (1)

[Claims] 1. A flow meter comprising steam flow rate detection means and steam pressure temperature detection means for detecting the pressure and temperature of steam, which is disposed on the inlet side of a steam heating device. The heat transfer efficiency of the steam heating device is calculated from the heat quantity of steam and the temperature of the object to be heated by calculating the heat quantity of the steam passing through the flowmeter based on the signal from the means, and by providing means for detecting the temperature of the object to be heated to detect the temperature of the object to be heated. A steam flow meter provided with a calculation unit for calculating.