JPS59164825A - Method for controlling combustion of dryer for cereal - Google Patents

Abstract

PURPOSE:To suppress abrupt change in feed fuel so as to make stable burning possible at all times even when interrupt processing is carried out by a microcomputer, by prolonging the time of one cycle of control of fuel supply when interrupt processing is carried out. CONSTITUTION:When a water content information intake request is given, then after a cycle time is reset, an arithmetic and control section 101 starts the water content value information intake processing. That is, when a judgment that there is the water content value intake request is made, and if the time of one cycle set in a step 20 has already passed for example 5sec, 10sec is set again by the fact that the judgment that there is the water content value intake request is made. As a result, when water content value intake processing is carried out, the time of one cycle of control of fuel is prolonged by 5sec to become 15sec. Thus, the amount of the supply of fuel per unit time given to the burner can be prevented from increasing, and stable burning can be provided at all times.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling the combustion of a grain dryer equipped with a rotary gasification burner.

As is well known, rotary gasification burners are powered by a motor.

It is equipped with a carburetor cylinder that is rotationally driven by a cylinder, a combustion disk fixed around the carburetor cylinder, and a fan mechanism that blows air from the front of the combustion disk through the inside of the vaporizer cylinder to the outside. The rotation and combustion heat atomizes and gasifies it, which is blown out from the front of the combustion disk by the air provided by the fan mechanism to form flames. In such a rotary gasification burner,
Since the relationship between the amount of fuel supplied and the amount of air blown has a significant effect on proper combustion, the amount of air blown is automatically adjusted in accordance with the amount of fuel supplied.

However, in a rotary gasification burner, there are differences in response to changes in fuel supply and changes in air flow, and while changes in supplied fuel appear relatively quickly, changes in air flow appear later than that. If the change is large, there is a problem that misfire or backfire may occur, impairing the stability of combustion. In other words, if the amount of supplied fuel suddenly decreases, the reduction in the amount of air blown will be slightly delayed, causing the fuel to become air-like and cause a misfire. This could cause a backfire.

From this point of view, in conventional grain dryers, when controlling the combustion of the rotary gasification burner using a micro-convenience store, the fuel supply control cycle is set to 10, for example, to prevent sudden fluctuations in the supplied fuel. It is configured to control the fuel supply amount for each time interval. However, in grain dryers, the display of the target drying temperature and the acquisition of moisture value information are processed by interrupts, so when such interrupt processing is performed, fuel and fuel supply control The cycle time of the fuel is shortened, which may cause sudden changes in the supplied fuel, which may impair the stability of combustion.

Therefore, the present invention aims to improve the 12 drawbacks of the conventional technology.The purpose of the present invention is to provide a combustion control method that can suppress rapid fluctuations in supplied fuel and always provide stable combustion even when interrupt processing is performed. Our goal is to provide the following.

A feature of the present invention for achieving the above object is that, in a combustion control method for a grain dryer in which combustion of a rotary gasification burner is controlled by a microcomputer, an interrupt processing request including calling up a target drying temperature and taking in moisture value information is provided. is given to the microcomputer, the cycle time of fuel supply control to the rotary gasification burner is extended, and the amount of change in fuel supplied to the burner per unit time is controlled to be equal to or less than a predetermined value. This is in the combustion control method of grain dryers such as grain dryers. The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a block diagram of a control device according to the method of the present invention;
The figure shows a flowchart of the configuration of FIG.

In FIG. 1, reference number -1 is a microcomputer, which includes an arithmetic control section 101, a memory 102, and a display memory 10.
3 and a counter 104.

The arithmetic control unit 10.1 receives operation information 2.2 as input information.
Sensor information 3. Grain information 4. Upon receiving the hot air temperature information 5, moisture value information 6, and moisture value information import request 7, the display device 8. Drive system 9. Output information is sent to the combustion system 10 and the fuel supply valve 11. The operation information 2 includes operation information for calling the target drying temperature in addition to loading operation information, drying operation information, and discharge operation information. The calculation control unit 101 is
Upon receiving these inputs, output information corresponding to each input is given to the target controlled object, causing it to perform operations according to the inputs. The sensor information 3 includes information such as a paddy jam sensor or an overheat sensor. The arithmetic control unit 101 receives these sensor information and outputs a signal to stop driving the drive system 9 and/or the combustion system 10 according to necessity. The grain information 4 includes information regarding the target moisture value of the grains to be dried, in addition to information regarding the loading amount and grain type. The calculation control unit 101 calculates and determines the drying target temperature TC in the dryer based on the information regarding the loading amount and grain type, stores the information in the memory 102, and also stores the target moisture value information of the grains to be dried. Similarly, it is stored in the memory 102. The target moisture value information is used to automatically stop the dryer when the moisture value of the grain to be dried reaches the target moisture value. That is, the arithmetic control unit 10 reads the current actual moisture value 6 of the grains to be dried every time a request 7 for acquiring moisture value information 7 is given, and when the actual moisture value reaches the target moisture value, Force the dryer to stop automatically. The hot air temperature information 6 is information regarding the actual temperature TB inside the dryer due to burner combustion. In this embodiment, as will be described later, a control pulse signal is input to the arithmetic control unit 101 every 10 seconds and is used to control the opening and closing of the fuel supply valve 11 according to the temperature difference between the drying target temperature Tc and the memory 102. Combustion control is performed by determining the amount of change in the on-time width of . The control 011 pulse signal given to the valve 11 is a so-called on-time control pulse with a constant period and variable A2 time width.

In addition to the control program, the memory 102 stores necessary fixed data and input data. The fixed data is O,' 1, which is the amount of change in the on-time width, as described later.
Examples include m5ec and 0.5insec. The performance control unit 101 determines whether the temperature difference ΔT between the heat Ill temperature TB and the target temperature TO is 0°C<ΔT<6°C or -6°C<ΔT<-1°C.
Then change the same width on R or take out 0.1 III S OC, and take out 0.5m5ec at ΔT≧6℃ or 8T≦-6℃. The reason why the amount of change in A time 1 width is divided into Q, 1m5eo and 0.5nl S e C using a temperature difference of 161℃ as a boundary is that the hot air temperature can be stabilized quickly against changes in the combustion supply chain. This is based on a rule of thumb. In addition, the maximum change amount of the on-time width was set to 0°5 m5ec because
The inventor has found experimental data that shows that if the amount of change in fuel supplied per unit time is kept below about 0.2% of the maximum amount of fuel supplied, changes in the number of dispatchers will suitably follow and proper combustion can always be ensured. This is due to the fact that Q, 5m5
eC is one cycle of fuel supply control as shown in this example.
If it is 0 seconds, it satisfies the above type ('t. Note that the maximum fuel 1 supply section naturally follows the capacity of the rotary cast burner. On the other hand, as input data, heat r@temperature T
B, there is information regarding the target wetness Tc, the measured actual moisture value, etc. Of course, the hot air temperature and the measured moisture value are updated and stored to the latest data.

The display memory 103 is for temporarily storing display output information, and normally hot air temperature and actual moisture value are stored alternately every 10 seconds, and when the target drying temperature is called, the target drying temperature is stored instead. Information regarding temperature is stored. The counter 104, as described later,
Since the time is counted in J cycles (10 seconds in this example), the star 1~ and reset are performed by the arithmetic control section 101. .

The display device 8 digitally displays temperature information and moisture value information. The drive system 9 includes a motor that drives an elevator, etc., and the combustion system 10 includes a fuel supply cylinder 1, an ignition heater, a burner fan motor, and the like. The fuel supply valve 11 opens and closes in accordance with a control pulse signal given from the calculation control section 101 to control the amount of fuel supplied to the burner. Note 1. This control pulse signal is converted into a voltage signal proportional to the on-time width, and is used to control the rotational speed of the burner fan motor, that is, automatically adjust the air flow rate.

The operation of the above structure will be explained below using the flowchart shown in FIG.

When the grain dryer is powered on, the microcomputer 1 enters the operating state, and executes a combustion control cycle, that is, a cycle time in which the amount of fuel supplied to the burner is changed according to the comparison between the hot air temperature and the drying target temperature. (In this example, 1
0 seconds) is counted from 1 to 1, and the counter 104 starts counting the time (step 20), and the elapsed time is determined by the time determination block described later. According to the start of the combustion control cycle, the calculation control unit 101 takes in the hot air temperature information 5 and grain information 4, stores the hot air humidity information in the memory 102, and calculates the drying target temperature based on the grain information and similarly uses the results. Store in memory 102 (step 21.22).

After the current hot air temperature and drying target temperature are stored in the memory 102, if drying is desired, if the combustion system is in the operating state (step 23), step 24. '25.2
22 of the 31st supply vinegar control pulse signal according to 6 and 27
Changing the time width (2) Determination is now performed, but in this example it is assumed that the drying switch has not been operated yet and therefore the combustion system has not been put into operation.

As a result, the on-time width change amount determination process is skipped and the process moves to the next display process.

The display process consists of steps 28, 29, 30 and 31, in which it is first determined whether the previous display on the display device 8 was a moisture value or a hot air temperature (step 28). However, since there is no previous display when the microcomputer starts operating, it is assumed that the display starts with the hot air temperature. As a result,
The hot air temperature information already stored in the memory 102 is transferred to the display memory IQ3 and given to the display M E3 as a display output (step 29.31). This display will be maintained for a cycle 01 of 10 seconds.

The flow then moves to determine whether the 10 second cycle time has elapsed (step 32). If it is assumed that one cycle time has not yet elapsed according to the judgment in step 32, the process moves to the input check (step 25) via a judgment as to whether or not there is an interrupt request (step 33.3!I). Input checks include loading operation information, drying operation information, discharge operation information, safety sensor information, etc.
The target control object is driven/112 or executed according to the results of these checks. Note that if the sensor information indicates that there is lightning, the driving of the drive system and/or combustion system is stopped.

Inlet opening 1. When it is recognized that the drying operation information has been given according to the
-11, through step 36, fuel supply 1
- is controlled 17fH (step 37). The drying scale fi lL'i CJ, the fuel ITh+ is supplied to the barb in accordance with the A-time-width-cut-period value stored in advance as fixed data in the drying scale 102, thereby checking whether it is in a dry state. To be peddled (Konaru)

When the progress of 1 cycle and 111 is recognized, as is clear from step 32, the next 1 cycle time is given and a count of 11.1 is started (stave 20). As a result, a new fever I! I temperature is taken in and the previous hot air temperature is updated, and the target thirst 1 odor is also updated. As mentioned above, the target temperature is determined based on the filling amount, grain type, etc., but it is generally corrected based on the outside temperature (not shown) and is updated accordingly.

After these are stored, the process moves to step 23 to determine the amount of change in a 22-hour period. When making this determination, the temperature difference △ 1 summer between the hot air temperature T8 and the drying target temperature TC is determined, and when this temperature difference is 6126°C or △-[≦-6°C, the process moves to step 27, and the temperature is set to 0°C. 〈△-“...6°C or -6°C
When <ΔT<-1°C, the process moves to step 26 (steps 24 and 25). The amount of change in the ON time width determined in this way is temporarily stored in a predetermined area of the memory 102, and the change is applied to the control pulse signal when controlling the fuel supply amount (step 37). .

After the amount of change in the on-time width in the cycle time is determined, a display process begins. Since the previous display was the hot air temperature, the measured moisture value will be displayed after steps 2.8.30 and 31.

Step 34゜40' imports the measured moisture value information.
, 41, 42, and 43 are stored in the memory 102 by interrupt processing. This process of acquiring moisture value information is carried out at predetermined intervals, and is carried out from the moisture bar 1 to the performance controller 1.
The time for taking in moisture value information is determined according to the presence or absence of a request for taking in moisture value information given to 01 (step 34). When a moisture (fJ) information acquisition request is given, after resetting the cycle time from 1 to 1 (step 40), the pupil control unit 10''l enters moisture value information acquisition processing. 1, which is set in step 20, when it is determined that there is import processing.
→Compared to "C" (J5 seconds have elapsed and Torere has reached C, the right judgment has been made in the moisture value import process, and the player is sent back to record 1 again for 10 seconds. As a result, 1) When moisture value import processing is performed, in the above example, one recycle time of fuel control is extended by 5 seconds to 15 seconds.In this way, in the case of interrupt processing related to moisture value information. , as a result of the 1 recycle time of combustion 1 control becoming longer, lj rank 1
The amount of change in U' fuel supply r1 per cycle time is smaller than when the cycle time is 10 seconds. Therefore, as long as the amount of change in the supplied fuel per unit time between 1-recycle time of 10 seconds is set to be less than 0.2% of the maximum supply amount, even if there is an interrupt process, the above supply! B
, and the stable combustion of the burner is not disturbed. The given measured moisture value information is calculated by performing a predetermined average pupil calculation between the measured moisture value and the previous moisture value.
The average value is stored in the memory 102 as the current moisture value (steps 41, 42, /13). Therefore, when displaying the moisture value, this moisture value information is used as a display output.

The interrupt processing is performed not only when the above-mentioned moisture value information is taken in, but also when calling the IJ target temperature. The operator control unit 101 determines whether or not there is a request based on whether or not target temperature call information has been given (step 33).Target temperature call information is generally issued by pressing an operation button using a Δberator. Given a demand, the 1'+j cycle time of the fuel 1'+1 control becomes 1-
It’s done! After ζ (step 38), drying target humidity information is sent to the display device 8. As a result,
As in the case of the moisture value, the interruption process prevents the burner combustion from being adversely affected.

As explained above, according to the present invention, one cycle time of the -C fuel supply control is extended during microcomputer interrupt processing, thereby preventing an increase in the amount of fuel supplied to the burner per unit time. It is possible to provide a combustion control method for a grain dryer that can always provide stable combustion.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control device according to the method of the present invention;
The figure numbers indicate flow steps of the configuration shown in FIG. 1...Eikl] computer

Claims (2)

[Claims] (1) In a combustion control method for a grain dryer in which combustion of a rotary gasification burner is controlled by a microcomputer, when an interrupt processing request including calling up a target drying temperature and taking in moisture value information is given to the microcomputer. Combustion of a grain dryer, characterized in that the cycle time of the fuel supply control to the rotary gasification burner is extended so that the amount of change in fuel supplied to the burner per unit time is controlled to be equal to or less than a predetermined value. Control method. (2) The combustion control method for a grain dryer according to claim 1, wherein the amount of change in fuel supply per unit time is about 0.2% of the maximum fuel supply (2).