JP2787396B2 - Steam flow meter - Google Patents

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 a flow rate of steam to be heated or dried by various devices. In a steam heating device, a steam flow meter is attached to the inlet side of the device in order to grasp the consumption of steam. Generally, dust, scale, rust and the like contained in the steam adhere to the heating surface of the steam heating device with the elapse of the usage time, and the efficiency of heat transfer to the object to be heated generally decreases. When the heat transfer efficiency is reduced, a large amount of steam heat is required to perform a predetermined heating, and the productivity per unit energy is reduced. In addition, uneven heat transfer to the object to be heated is caused to lower the production quality. It 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 apparatus, the pressure, temperature, and steam flow rate of steam supplied to the steam heating apparatus, and the temperature before and after heating of an object to be heated. And 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, the temperature, and the steam flow rate of the supplied steam, and a decrease in heat transfer efficiency is detected based on how many times the temperature of the object to be heated has been increased by the amount of supplied heat. is there.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
A flow meter or the like for measuring the amount of the object to be heated is required separately from the steam flow meter, and there has been a problem that the device cost is increased to detect the heat transfer efficiency and the device configuration is complicated.

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

[0005]

Means for Solving the Problems] technical means of the present invention taken in order to solve the technical problems described above, the steam flow rate detecting means and a steam pressure temperature detection means for detecting the pressure and temperature of the steam Having the steam flow rate detecting means and steam pressure temperature
The amount of steam heat passing through the flow meter is determined by the signal from the detection means.
In addition to being able to calculate, the flow meter placed on the inlet side of the steam heating device
Of detecting the inlet-side temperature and the outlet temperature is provided an object to be heated a temperature detecting means, steam heat and the heated object passing through the flow meter
And a calculation unit for calculating the heat transfer efficiency of the steam heating device based on the temperatures on the inlet side and the outlet side .

[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 via the flow meter. The amount of heat supplied to the steam heating device is converted based on 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 heated object 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 heated object by the supplied heat amount. Further, the heat transfer efficiency can be similarly easily converted 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 measuring the flow rate of steam constantly and measuring the change in heat transfer efficiency when the supply amount of the heated object is a predetermined amount, it is possible to detect the state of adhesion of foreign substances on the heating surface of the steam heating device, that is, the heat transfer efficiency. ,
By appropriately performing cleaning or the like, the heat transfer efficiency of the device can be maintained in a desired range.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). A steam supply pipe 10 for supplying steam to the steam heating device 1 is connected, 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 steam pressure and temperature detecting means are mounted. On the secondary side of the steam heating device 1, a condensate outlet pipe 20 for leading out the condensate generated in the steam heating device 1 is connected, and a steam trap 7 for automatically discharging the condensate flowing down is attached. The steam trap 7 is not always necessary if the amount of condensate 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 calculation unit 6, respectively. A heating object supply pipe 12 for supplying an object to be heated is connected to the steam heating device 1 via a valve 14 and a temperature sensor 13 as a temperature detecting means on the inlet side of the object to be heated. A take-out pipe 15 for taking out the heat 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 calculation unit 6, respectively.

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

On the primary side of the flow meter 3 of the steam supply pipe 10, a control valve 11 for adjusting the amount of steam supplied and a separator 22 for separating steam and condensate in the steam supply pipe 10 are provided.
A system that discharges the condensate separated by the separator 22 out of the system
The air trap 23 is provided.

Next, the operation will be described. The object to be heated in the steam heating device 1 is latent-heated by the steam supplied from the steam supply tube 10 and is taken out from the object to be taken out tube 15. The amount of supplied steam is measured by the steam flow meter 3.
The steam deprived of heat by the latent heat is condensed and discharged out of the system through a steam trap 7 attached to the secondary side of the steam heating device 1. Steam flow meter 3 and pressure sensor
8, a temperature sensor-9, and a heated object temperature sensor-13,
Each signal from 16 is input to the arithmetic unit 6. The calculation section 6 calculates the calorific value 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. The side temperature difference is calculated. Further, in the arithmetic 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 calorific value 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 when the supply amount of the object to be heated is substantially constant by dividing the amount of steam heat.

[0011]

As described above, according to the present invention, a flowmeter for separately detecting the supply amount of the object to be heated is not required for detecting the heat transfer efficiency of the steam heating apparatus, and the apparatus is inexpensive and can be used for the apparatus. A steam flow meter having a simple configuration can be obtained.

[Brief description of the 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]

 DESCRIPTION OF SYMBOLS 1 Steam heating device 3 Steam flow meter 6 Operation part 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 Temperature sensor for outlet of heated object

Claims (1)

(57) [Claims] 1. A steam flow detecting device comprising: a steam flow rate detecting means; and a steam pressure / temperature detecting means for detecting a pressure and a temperature of steam.
By the signal from the flow rate detection means and the steam pressure temperature detection means
It can calculate the calorific value of steam passing through the flow meter.
In the flow meter disposed on the inlet side of the steam heating device, provided a heated object temperature detecting means for detecting the inlet side temperature and the outlet side temperature of the heated object to the steam heating device , Flow meter
A steam flow meter comprising a calculation unit for calculating the heat transfer efficiency of a steam heating device based on the amount of steam heat passing therethrough and the temperatures of an inlet side and an outlet side of an object to be heated.