JP3924038B2 - Steam trap operating condition evaluation method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam trap operating state evaluation method for evaluating the operating state of a steam trap, that is, whether or not condensate is normally discharged by detecting the temperature of the steam trap.
[0002]
Steam traps are attached to steam lines and equipment that use steam, and do not leak steam, but automatically discharge only condensate. If it does not operate properly, steam transport and production activities will be seriously hindered. For example, if the condensate discharge function is defective, that is, a trap with a discharge capacity smaller than the generated condensate volume is selected and the capacity is insufficient, or the condensate discharge function is lost and the trap is exhausted. In such a case, condensate stays in the inlet side piping of the steam trap, causing water and hammer, reducing the efficiency of steam-using equipment, and destroying the equipment. Moreover, if the valve closing function is lowered and steam is leaked, expensive energy is wasted.
[0003]
[Prior art]
Therefore, it has been conventionally practiced to evaluate the operating state of the steam trap, one of which is disclosed in Japanese Patent Publication No. 5-14839. The technology disclosed here detects the temperature and vibration of the steam trap with the temperature and vibration detection means, supplies the detected temperature signal and the detected vibration signal to the evaluation circuit, and the condensate discharge function from the detected temperature by the evaluation circuit. And detecting a steam leak from the detected vibration. When the steam trap becomes insufficient or funneled, the steam trap leaks due to the detection of a defective condensate discharge function based on the fact that the temperature drops compared to when the condensate is discharged normally. Then, the steam leakage is detected based on the fact that the vibration becomes larger than when the condensate is discharged normally.
[0004]
[Problems to be solved by the invention]
In the conventional steam trap operating state evaluation method, there is a case where the steam leak cannot be detected when the steam leak is small. This is because the vibration caused by a small amount of steam leakage may be smaller than the vibration produced when the condensate is normally discharged to the maximum.
[0005]
Therefore, the technical problem of the present invention is to provide a steam trap operating state evaluation method capable of accurately detecting the steam trap condensate discharge function failure and steam leakage.
[0006]
[Means for Solving the Problems]
In order to solve the above technical problem, the steam trap operating state evaluation method of the present invention detects the temperature and vibration on the primary side of the steam trap valve port by means of temperature and vibration detection means, and detects this primary side. A first evaluation process for supplying a detection temperature signal and a primary detection vibration signal to the evaluation circuit, and detecting a defect in the condensate discharge function based on the primary detection temperature and the reference temperature by the evaluation circuit; A second evaluation process for detecting a steam leak based on the primary side detection vibration and the normal upper limit vibration, and the temperature on the secondary side of the steam trap valve port is detected by the temperature and vibration detection means. The detected temperature signal is supplied to the evaluation circuit and the pressure on the secondary side of the steam trap valve port is input to supply the secondary pressure to the evaluation circuit. The secondary side supplied by the evaluation circuit Convert pressure to secondary saturation temperature It is characterized in that and a third evaluation step of detecting steam leakage based on the secondary-side detection temperature and the secondary side saturation temperature above evaluation circuit.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The method for evaluating the operating state of a steam trap according to the present invention detects a defect in the condensate discharge function based on the detected temperature on the primary side of the valve port of the steam trap and the reference temperature, and detects the primary side vibration of the valve port of the steam trap. The steam leak is detected based on the normal upper limit vibration, and the steam leak is detected based on the secondary detection temperature of the steam trap valve port and the secondary saturation temperature of the steam trap valve port. The temperature on the secondary side of the steam trap valve port is higher when steam leaks than when the condensate is discharged normally. Steam leaks can be detected based on temperature. As described above, since the defective condensate discharge function is detected based on the detected temperature and the steam leak is detected based on the detected temperature and the detection vibration, it is possible to accurately detect the defective condensate discharge function and the steam leak of the steam trap.
[0008]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIGS. 1 and 2).
FIG. 2 is a block diagram showing a schematic configuration of an apparatus used in the method for evaluating the operating state of the steam trap, and a program incorporating temperature and vibration detecting means for detecting the temperature and vibration of the steam trap (not shown). A probe 1 and an apparatus body 2 for processing the detected temperature signal and the detected vibration signal of the probe 1;
[0009]
The apparatus main body 2 amplifies the detected temperature signal and the detected vibration signal supplied from the probe 1 via the dedicated cable 3 by the signal amplifier 4 and digitizes the amplified signal by the A / D converter 5. It has CPU6 as an evaluation circuit into which a signal is input.
[0010]
The CPU 6 processes the temperature signal and vibration signal input from the A / D converter 5 and the pressure signal input from the operation unit 7 in accordance with the processing program stored in the storage unit 8, thereby the steam trap. Evaluate the operating state of Then, the evaluation result is displayed on the display unit 9. The operation unit 7 is constituted by, for example, a push button (key) for inputting the pressure signal and giving an operation command to the CPU 6. Further, the display unit 9 is configured by, for example, a liquid crystal panel in order to display the above evaluation result or to display the above operation command according to the display command from the CPU 6.
[0011]
Next, the operation of the CPU 6 will be described with reference to the flowchart of FIG. Probe 1 is pressed against the primary side piping (not shown) near the steam trap or the primary side of the steam trap valve port to detect the temperature and vibration on the primary side of the steam trap port. (Step S1). The detected primary side detected temperature signal and primary side detected vibration signal are supplied to the CPU 6 via the signal amplifier 4 and the A / D converter 5. Then, the pressure on the primary side of the steam trap valve port is inputted from the operation section 7 (step S2). The input primary pressure is supplied to the CPU 6.
[0012]
The CPU 6 converts the supplied primary pressure into a primary saturation temperature (step S3), and determines whether the supplied primary detection temperature Ti is a reference temperature, for example, 40 ° C. or more (step S4). . If the answer to this step S4 is No, it is evaluated as a drunkenness (step S5). If the answer to this step S4 is Yes, it is determined whether or not the supplied primary side detected temperature Ti is, for example, a value obtained by multiplying the converted primary side saturation temperature Sti by 0.6 (step S6). . If the answer to step S6 is No, it is evaluated that the capacity is insufficient (step S7).
[0013]
If the answer to step S6 is Yes, it is determined whether the supplied primary detection vibration UL is equal to or less than the normal upper limit vibration (step S8). If the answer to step S8 is No, it is determined whether or not the supplied primary-side detection vibration UL is equal to or greater than the leakage small upper limit vibration (step S9). If the answer to this step S9 is No, it is evaluated that the steam leakage is small (step S10). If the answer to step S9 is Yes, it is determined whether or not the supplied primary-side detection vibration UL is greater than or equal to the upper limit vibration during leakage (step S11). If the answer to step S11 is No, it is evaluated that steam is leaking (step S12). If the answer to step S11 is Yes, it is determined whether the supplied primary detection vibration UL is greater than or equal to the leak large upper limit vibration (step S13). If the answer to step S13 is No, the steam leak is evaluated as large (step S14). If the answer to this step S13 is Yes, it is evaluated as blown away (step S15).
[0014]
If the answer to step S8 is yes, the probe 1 is pressed against the secondary side piping near the steam trap or the secondary side of the steam trap valve port, and the secondary of the steam trap valve port is pressed. The side temperature and vibration are detected (step S16). The detected secondary side detection temperature signal and secondary side detection vibration signal are supplied to the CPU 6 via the signal amplifier 4 and the A / D converter 5. Then, the pressure on the secondary side of the valve port of the steam trap is inputted from the operation unit 7 (step S17). The input secondary pressure is supplied to the CPU 6.
[0015]
The CPU 6 converts the supplied secondary pressure into a secondary saturation temperature (step S18), and the supplied secondary detection temperature To is, for example, 0.6 converted to the converted secondary saturation temperature Sto. It is determined whether or not the value is greater than or equal to (step S19). If the answer to this step S19 is No, it is evaluated that the steam leakage is small (step S20). If the answer to step S19 is Yes, it is evaluated as normal (step S21).
[0016]
【The invention's effect】
As described above, the steam trap operating state evaluation method of the present invention accurately detects a steam trap by detecting a defect in the condensate discharge function based on the detected temperature and detecting a steam leak based on the detected temperature and detected vibration. The condensate discharge function is poor and steam leakage can be detected.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a CPU program used in an embodiment of a steam trap operating state evaluation method according to the present invention.
FIG. 2 is a block diagram showing a schematic configuration of an apparatus used in an embodiment of a method for evaluating an operating state of a steam trap according to the present invention.
[Explanation of symbols]
1 Probe (temperature detection means)
2 device body 4 signal amplifier 5 A / D converter 6 CPU (evaluation circuit)
7 Operation unit 8 Storage unit 9 Display unit

Claims (1)

The temperature and vibration detection means detects the temperature and vibration on the primary side of the steam trap valve port, supplies the primary side detection temperature signal and the primary side detection vibration signal to the evaluation circuit, and the evaluation circuit detects the primary side detection temperature. A first evaluation process for detecting a defect in the condensate discharge function based on the reference temperature and a second evaluation process for detecting a steam leak based on the primary detection vibration and the normal upper limit vibration in the evaluation circuit; The temperature and vibration detection means detects the temperature on the secondary side of the steam trap valve mouth, supplies this secondary side detected temperature signal to the evaluation circuit, and adjusts the pressure on the secondary side of the steam trap valve mouth. Input and supply this secondary side pressure to the evaluation circuit, convert the secondary pressure supplied by the evaluation circuit to a secondary saturation temperature, and use the evaluation circuit to detect the secondary side detected temperature and the secondary side. A third to detect steam leakage based on the saturation temperature Mutorappu operating state evaluation method - steel, characterized in that it comprises a valence process, the.

Images