JPH0452406B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a moisture content detection method and device for detecting the moisture content of air in a predetermined surrounding environment, and in particular to a moisture content detection method and device for detecting moisture content in exhaust gas in an industrial drying treatment device. The present invention relates to a method and apparatus for detecting moisture content in which the detected apparent moisture content is adjusted by coefficients of a relational expression stored in a microprocessor.

In general, in industrial drying processing equipment, it is extremely desirable economically if the coefficients of the relational expression related to the moisture content in the exhaust gas can be accurately adjusted so that the operation is performed at maximum efficiency. This was even more desirable in an era when fuel costs were high. However, due to air pollution, hygrometer,
It has often been the case that the functions of other humidity detecting sections are affected and deteriorate as the number of days of air pollution passes.

Up until now, various attempts have been made to improve the humidity detection section and prevent or minimize the deterioration of its functionality, but these efforts have been far from complete. .

According to one aspect of the present invention, even if the detection of the moisture content of the surrounding environment air by the humidity detection unit is an apparent moisture content and is inaccurate,
A moisture content detection method in which accurate moisture content is detected by adjusting a process or operation based on a corresponding correction signal, wherein the humidity detection section detects the moisture content of surrounding environmental air. It emits an output signal according to the state of A moisture content sensing method is provided.

In other aspects of the present invention, even if the detection of the moisture content of the ambient air surrounding the humidity detection unit is an apparent moisture content and an inaccurate moisture content, a correction signal corresponding to the detected moisture content is used to process the moisture content. Alternatively, the moisture content detection device is capable of accurately detecting moisture content by adjusting the operation, wherein the moisture detection section outputs an output signal according to the state of the moisture content of the surrounding environment air. a means for generating a correction signal according to a certain relational expression whose output signal is a function; and a means for accurately adjusting the moisture content using the correction signal. A sensing device is provided.

This moisture content detection device has a storage means in which the above-mentioned relational expression is stored, and the means for emitting and adjusting a correction signal according to the relational expression and detecting an accurate moisture content is stored in the storage means. It operates according to the relational expression.

Furthermore, the means for adjusting according to the stored relational expression activates the correction signal at regular time intervals, and the output signal of the humidity detector at at least one predetermined value of the moisture content is stored. The computer should have a storage means for storing information.

Furthermore, a warning means is provided for issuing a warning signal in case the output signal at any predetermined value of the moisture content exceeds a predetermined range over time or does not reach a predetermined level. I am trying to set it up.

Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

To explain Fig. 1, the material to be dried B
Oven A, which accommodates
℃, and air with a dew point of 20℃ is supplied. Air is material B
and receives moisture from the material in the process.
It is discharged from the outlet hole E in a state where the humidity is reduced but the dew point is increased. A portion of the discharged air is discharged from position F, and the rest reenters the oven A via the pipe P through the inlet hole D together with the heated dry air sucked in through the hole G. In order to achieve the most efficient drying, the amount of air discharged from position F and the amount of make-up air taken in through hole G should be adjusted to correspond to the amount of moisture in the air exhausted through exit hole E. is generally required.

Referring to FIG. 2, block H represents a hygrometer or other humidity sensing device located in the air exiting from outlet hole E shown in FIG.
The primary detection part result of the humidity detection part is represented by curve a,
The moisture content x thereby generates an output signal y.

This output (output signal y) of the humidity detection section is given to a microprocessor, and one of the functions of this microprocessor is to calculate the relational expression as shown in the figure by using the curve aa as a function of the output signal y. is to be stored in memory. Another function of the microprocessor is to generate a correction signal xx in response to its stored relationships. This correction signal is applied to the moisture content regulator C, where the first
The proportion of air discharged at position F shown in the figure and other coefficients of the above relationship are adjusted.

According to the test, as time passes, the sensitivity of the humidity detection section H decreases due to air pollution and changes to the state shown by the curve da. In this case, an apparent moisture content reduced from the original moisture content x is generated as the output signal dy. This apparent output signal dy is expressed by the relational curve, which is its relational expression.
Application of aa will generate a reduced apparent signal dxx. This apparent signal turns into an inaccurate apparent moisture content with respect to the actual moisture content x, resulting in a detection lower than the actual moisture content, which reduces the detection effect.

In order to correct the detection of moisture content by the moisture detection section H whose function has deteriorated, the connected microprocessor performs the following steps at time intervals determined by the connected microprocessor:
Arithmetic processing is performed to correct the moisture content detected by the moisture detection unit in accordance with the stored known moisture content of different ambient air, and the result is transmitted as an output signal. In this case, the known moisture content is generally different from the apparent mixed content indicated by the moisture detection section.

These output signals generate correction signals according to the relational expressions stored in the memory of the microprocessor, and accurately correct the apparent signal dxx generated by the apparent output signal dy detected by the humidity detection section H. Change the signal to xx, or at least change it so that it approaches this.

Note that in some implementations of moisture content detection, it is necessary to employ only one ambient air, so that the relation stored in the memory of the microprocessor is Calculation processing is performed based on this information, and the correction is made. on the other hand,
In cases where the sensitivity of the humidity detection section H is extremely poor or the moisture content regulator C is extremely malfunctioning and precision is required,
Three or more different predetermined values of the ambient air are employed to detect the moisture content.

The relational expression stored in the memory of the microprocessor is: d=fyn+k d: Moisture content at the dew point of the surrounding environment air f: log y: Output n of the moisture content from the humidity detection section (hygrometer) : Multiplier value k: Represented in the form of a constant, a relational expression is stored in memory as a function of the output signal y, and is represented by the curve aa shown in FIG.

On the other hand, the moisture content x of the ambient air detected by the humidity detection unit is generally determined by using the dew point as a reference value, and the moisture content at that dew point is Equal to d=logx・n+k,
The result is as shown by curve a in FIG.

The sensitivity of the humidity detection unit, which determines the moisture content at the dew point of the surrounding environment air, changes over time due to deterioration and detects the curve da, so although it is not accurate, it is The value of the moisture content d at the dew point of the surrounding environment air is equal to the relational expression that is a predetermined reference value stored, and based on this, the reading of the moisture content by the humidity detection unit over time is adjusted and always accurate. so that it is.

In this way, the moisture content d at the dew point stored in the microprocessor is equal to the moisture content at the dew point of the ambient ambient air.

Therefore, the curve a shown in FIG. 2 represents the reading of the humidity detection section, and the reading successively represents the moisture content of the surrounding environment air, which is stored in the microprocessor. The apparent output signal dy due to the change over time of the humidity detection section is corrected by the curve aa stored in the microprocessor.

In addition, as one of the moisture content detection methods and devices for detecting the moisture content of the air in a predetermined surrounding environment, the output signal from the humidity detection section is monitored for a certain period of time. If the output signal changes by more than a predetermined value during this period, a warning signal may be generated to indicate that it is not reliable for the humidity sensor to be used for this purpose. good.

In another embodiment of this device, the humidity detection section may be provided with purification means if necessary, and is used, for example, when a warning signal is issued due to severe functional deterioration. This purification means includes gas purification treatment,
There is a liquid purification process or a heat purification process, and the appropriate selection is made depending on the nature of the humidity detection unit and its contamination.

If it is desired to change the relational expression stored in the microprocessor, the connection between the moisture content regulator C and the microprocessor must be disconnected. However, in many cases it is done during the drying process of the equipment and may be less of a problem even if no adjustments are made. Furthermore, in another embodiment,
A case where two combinations of a humidity detection section, a microprocessor, and a moisture content regulator are made, and when one of these combinations is operated, the relational expression stored in the other microprocessor can be changed. The microprocessor is capable of displaying the coefficients or conditions of the relational expression using graphical, numerical or other display formats. In addition, the microprocessor determines the final equilibrium state, or the time to reach such a state, to accurately adjust the moisture content detection of the humidity sensor according to the stored response characteristics in response to changes in the ambient air. must be programmable so that it can be predicted.

Although the moisture content detection method and its device described above are related to the detection of moisture content in environmental air, the present invention can be applied to other gases, liquids, solids, or other gases by making appropriate changes. These two
It can also be used to detect moisture content in mixtures.

Although the correction signal in the embodiments described above is applied to process or operational adjustments, it is not limited to the fact that the condition of the humidity sensor is still relatively unaffected and indicates an accurate moisture content in the surrounding environment. The advantage is that it can also be applied to environmental air.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an industrial drying oven which is an embodiment of the present invention, and FIG. 2 is an explanatory diagram of an adjustment mechanism of the oven shown in FIG. A: Oven, B: Drying material, C: Moisture content regulator, D: Inlet hole, E: Outlet hole, F: Discharge hole, G: Heated air inlet, H: Humidity detection section, P: Pipe, a: detection curve, x: moisture content, y: output signal, xx: correction signal.

Claims (1)

[Claims] 1. Even if the humidity detection section initially accurately reads the moisture content of the ambient air around it, but begins to transmit inaccurate readings due to a deterioration phenomenon, it cannot be used. A moisture content detection method that accurately indicates the moisture content within a certain operating time, comprising: (a) detecting the moisture content of the surrounding environment air by a humidity detection section; and (b) displaying an indication of the detection. Even if it is the apparent moisture content of the surrounding environment air, the humidity detection section detects the moisture content and outputs an output signal. arithmetic processing is carried out by a control means that controls by comparison with the relationship as a function of the output signal of the amount, and (d) If the result of the arithmetic processing indicates that the humidity detection section has deteriorated in function, the extent of the deterioration is assessed. For this reason, a correction signal is issued in comparison with the standard value, and the correction signal is used to adjust the control that is dependent on the humidity detection unit deteriorating and transmitting malfunctions, and to cascade commands for accurate display. A moisture content detection method characterized by transmitting a message. 2. Even if the humidity detection unit initially accurately reads the moisture content of the ambient air around it, but begins to transmit inaccurate readings due to deterioration phenomena, it may be used and A moisture content detection method that accurately indicates the moisture content in the surrounding environment, comprising: (a) detecting the moisture content of the surrounding environment air by a humidity detection section; and (b) displaying the detection as the appearance of the surrounding environment air. Even if the moisture content is , the humidity detection section detects the moisture content and issues an output signal, c This output is a function of the output signal of the moisture content stored in the storage means. d) If the humidity detection section has deteriorated in function as a result of the calculation, the degree of deterioration can be evaluated by comparing it with standard values. e, an activation signal is issued to purify the humidity detection part, and e the activation signal causes the humidity detection part to be purified, to recover from deterioration, and to accurately display and transmit the moisture content. Characteristic moisture content detection method. 3. Even if the humidity sensor initially accurately reads the moisture content of the ambient air, but deteriorates and begins to give inaccurate readings within a certain operating time, This is a moisture content detection device that is commanded to accurately display the moisture content, and a) it initially read the moisture content accurately, but due to deterioration, inaccurate readings may occur within a certain operating time. (a) a humidity detection unit that detects the apparent moisture content even if the moisture content is detected; b) the output signal from the humidity detection unit is an output signal of the moisture content stored in the storage means; a control means that performs arithmetic processing by comparison with a relationship as a function; (d) The correction means corrects the control that is likely to rely on statements that malfunction due to deterioration of the humidity detection unit, so that the moisture content of the ambient air is accurately displayed. 1. A moisture content detection device comprising: an adjustment means that continuously sends an instruction to increase moisture content. 4. The moisture content detection device according to claim 3, wherein the storage means, control means, correction means, and adjustment means are constituted by a microprocessor.