JP3625698B2 - Sample sludge weight measurement method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a measuring device for sludge moisture content and ignition loss, and relates to a sample sludge weight measuring method for measuring the weight of a sample in a high temperature atmosphere.
[0002]
[Prior art]
In recent years, sewage treatment facilities tend to employ wide-area sludge treatment for the purpose of efficient disposal of sludge. However, the sludge properties that are carried in easily change over time and affect the stable operation of the incineration and melting treatment plants. Measuring the moisture content of the sludge and the loss on ignition in advance in such a treatment plant is important for stable operation of the plant.
[0003]
This measurement is performed based on a test method defined by the Japan Sewerage Association. For the moisture, the sample sludge is dried at 105 to 110 ° C. for 2 hours, the weight of the total evaporation residue after the lapse is measured, and the difference from the weight of the sample sludge before drying is calculated. For ignition loss, the total evaporation residue after moisture content measurement is ashed at 600 ± 25 ° C for 1 hour, and the weight of the ignition residue after the lapse of time is measured, and the difference from the weight of the total evaporation residue is calculated. calculate.
[0004]
In a conventional measuring device for sludge moisture content or loss on ignition, sample sludge is collected in a sample dish, dried or ashed in a heating and weighing chamber, and the weight of each stage of sample sludge is measured.
[0005]
[Problems to be solved by the invention]
The above-described conventional measuring apparatus does not proceed normally, and for example, when it is determined that a trouble has occurred and an abnormal state has occurred during the drying process or the high-temperature ashing process, an automatic stop operation occurs. Factors that determine this abnormal state include the following.
1. 1. When an emergency stop switch is pressed by an operator or an emergency stop signal is input as an operation command. 2. When the measuring device detects a device failure or abnormal operation by itself. When the door of the measuring device is opened for some reason (because an error occurs in weight measurement)
The measuring device stops the supply and heating of sludge in the automatic stop operation. The measuring device removes the cause of the abnormal situation, returns to the initial state by manual operation, and starts the measurement operation from the beginning in response to the automatic measurement start signal.
[0006]
However, depending on the stage of the measurement operation, the return operation differs depending on the position of the sample dish and the state of sludge on the sample dish, for example. It will be a thing.
For this reason, when an abnormality occurs, the operator removes the cause of the abnormality, and at the same time, returns the sample dish to the initial position, and removes sludge during measurement if it remains on the sample dish. It was necessary to return to the position and restart the automatic measurement. In particular, it took time and effort to remove the sludge remaining in the sample pan during measurement.
[0007]
The present invention solves the above-described problems, and an object of the present invention is to provide a weight measurement method for sample sludge that can easily return to an initial state when an abnormal situation occurs.
[0008]
[Means for solving the problems]
In order to solve the above-described problems, the sample sludge weight measuring method of the present invention is a sample that covers the sampling position outside the heating weighing chamber, the measuring position of the weighing pan placed inside the heating weighing chamber, and the disposal position outside the heating weighing chamber. The dish is moved by the robot hand, the sample sludge is collected in the sample dish at the collection position, and the sample sludge is heated to the set temperature by the heat source placed in the upper part of the heating and weighing chamber at the measurement position. Measure the weight of the residue at the end of the drying process and ignition ashing process with a measuring instrument placed outside the heating weighing chamber in support of the weighing pan, and the residue on the sample dish at the disposal position. In a measuring device that sucks and removes the sample pan, then returns the sample pan to the measuring position of the balance pan, cools the heating weighing chamber by exhausting the air in the heating weighing chamber, and returns to the initial state.
When the measuring device stops abnormally in the middle of the measurement operation, as a return operation to return to the initial state, place the sample pan at the measurement position and move to the ignition ashing process, after the ignition ashing process ends Residue on the sample pan is removed by suction at the disposal position, then the sample pan is returned to the measuring position of the weighing pan, and the air in the heating weighing chamber is exhausted to cool the heating weighing chamber and return to the initial state. It is.
[0009]
With the above configuration, when an abnormality occurs, the return operation is performed after the operator removes the cause of the abnormality. This return operation can be performed using the function used by the measurement device in the measurement operation by ashing and removing the sample sludge remaining in the sample pan, and the operator is required to remove the sample sludge. It is easy to return to the initial state without any need.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the measuring device 1 includes a measuring device main body 2 and a measurement control panel 3, and the measuring device main body 2 is partitioned into a sludge collection chamber 4, a heating and weighing chamber 5, an electronic balance chamber 6, and a disposal chamber 7. A space is formed.
[0011]
An electronic balance 8 is arranged as a measuring device in the electronic balance chamber 6, a balance pan 9 of the electronic balance 8 is placed inside the heating weighing chamber 5, and a sample pan 11 for collecting the sample sludge 10 is placed on the balance pan 9. It is location. The heating metering chamber 5 has a halogen lamp device 12 as a heat source at the top, a deodorizing fan 13 at the top of the side wall surface, and a door device 14 for opening and closing an opening 5a formed on one side wall surface. Yes.
[0012]
In the sludge collection chamber 4, a robot hand 15 for handling the sample dish 11 is arranged, a sludge supply system 16 for supplying the sample sludge 10, a suction system 17 for sucking and removing the residue after measurement, A drainage system 18 for dumping excess sludge remaining in the sludge supply system 16 is opened. The sludge supply system 16 has a mud supply pump 19 and an open / close valve 20 in the middle, and has a supply port 21 in the vertical direction at the tip, and the supply port 21 is supplied with compressed air to push the sample sludge 10 with compressed air. The system 22 is in communication. The suction system 17 has a suction blower 23 and an ash collecting can 24 disposed in the disposal chamber 7, and the drainage system 18 has a stirring tank 25 and a drainage pump 26 disposed in the disposal chamber 7.
[0013]
The measurement control panel 3 that controls these devices includes a lamp controller 27 that controls the output of the halogen lamp device 12, an instruction controller 28 that adjusts an instruction amount to the lamp controller 27, and a personal computer 29. 29 receives the output from the temperature sensor 30 and the electronic balance 8 disposed in the heating and weighing chamber 5, and controls each device to perform a measurement operation.
[0014]
Hereinafter, the operation of the above-described configuration will be described. The sludge used for the sample is taken out through a sludge supply system 16 from a main pipe (not shown) that supplies the sludge to the incineration and melting treatment plant. This sludge extraction operation is continuously performed by driving the feed pump 19 to take in real time sludge of the same quality as the sludge flowing through the main pipe, and throwing in the drainage system 18 sludge not collected as a sample. In the initial state of one cycle of the measurement operation, the sample pan 11 is on the balance pan 9 in the heating and weighing chamber 5. The measured weight of the electronic balance 8 at this time is stored as the own weight W ₀ of the sample pan 11.
[0015]
The measurement operation will be described with reference to the flow shown in FIG. The on-off valve 20 is once closed, and the sludge remaining in the supply port 21 is discharged by the compressed air supplied from the compressed air supply system 22. The door device 14 of the heating and measuring chamber 5 is opened, and the robot hand 15 is operated to move the sample dish 11 to the collection position. (St. 1) Compression that supplies the predetermined amount of sample sludge 10 from the supply port 21 to the sample pan 11 by opening the on-off valve 20 for a predetermined time and supplies the sludge remaining in the supply port 21 from the compressed air supply system 22 Exhaust by air. (St.2)
The door device 14 is opened, and the sample pan 11 from which the sample sludge 10 has been collected is placed on the balance pan 9 by the robot hand 15. (St. 3) The door device 14 is closed, the weight of the sample sludge collected by the electronic balance 8 is measured, and the measured value is stored. (St. 4) Thereafter, the weight is continuously measured. The lamp controller 27 lights the halogen lamp device 12 with a predetermined output, heats the sample sludge 10 to a set temperature (105 to 110 ° C.), and dries the sample sludge 10. In this drying process, the time when the weight change per minute becomes zero is defined as the end of the process. (St. 5) The weight measured by the electronic balance 8 at the end of the drying step is stored as the weight of the evaporation residue. (St. 6)
The output of the halogen lamp device 12 is increased by the indicator controller 28, the evaporation residue remaining in the sample pan 11 is heated to a set temperature (600 ± 25 ° C.), and the sample sludge 10 is ashed. In this ignition ashing step, the time when 15 minutes have elapsed after the start of heating is defined as the end of the step. (St. 7) The weight measured by the electronic balance 8 at the end of the ignition ashing process is stored as the weight of the ignition residue. (St. 8)
The sample pan 11 is taken out of the heating and weighing chamber 5 by the robot hand 15, and the sample pan 11 is made to correspond to the suction system 17 at the disposal position. (St. 9) The suction blower 23 is driven to remove the ignition residue on the sample dish 11 and the sucked ash is stored in the ash collecting can 24. (St. 10)
The door device 14 of the heating and weighing chamber 5 is opened, and the sample pan 11 is returned to the measuring position of the balance pan by the robot hand 15. (St. 11) Thereafter, the air in the heating and measuring chamber 5 by the deodorizing fan 13 is exhausted to cool the heating and measuring chamber 5 and the sample pan 11 and return to the initial state. (St. 12)
When the measuring device 1 is abnormally stopped during the measurement operation, a return operation for returning to the initial state is performed. As shown in FIG. 3, when the measuring apparatus 1 is abnormally stopped (St. 13), the operator removes the cause of the abnormality and inputs an instruction to continue or end the operation to the personal computer 29 waiting for command input (St. 14). To do.
[0016]
The personal computer 29 determines the input command (St. 15), and if it is an end instruction, ends the automatic measurement operation. (St. 16) When the operation is continued, it is determined whether the robot hand 15 is in a closed state in which the sample dish 11 is held or in an open state in which the sample dish 11 is released. (St. 17) When the robot hand 15 is in the closed state, the door device 14 of the heating and weighing chamber 5 is opened, and the robot hand 15 is operated to place the sample dish 11 on the balance dish 9. (St. 18) When the robot hand 15 is in the open state, the operation is skipped. Here, the weight W ₀ measured by the electronic balance 8 is stored. (St. 19)
The personal computer 29 takes in the own weight W ₀ of the sample pan 11 measured most recently, and compares the value obtained by subtracting 0.1 g from this weight W ₀ with the current measured weight W of the electronic balance 8 (St. 20). When the current measured weight W is small, an alarm is output on the assumption that the sample pan 11 has dropped from the balance pan 9. (St. 21)
When the current measured weight W is large, the process proceeds to a heat ashing process, and the sludge in the sample dish 11 is heat ashed. (St.22)
After completion of the igniting heat ashing step, the sample pan 11 is taken out from the heating and weighing chamber 5 by the robot hand 15, and the sample pan 11 is made to correspond to the suction system 17 at the disposal position. (St.23) The suction blower 23 is driven to remove the ignition residue of the sample dish 11 and the sucked ash is stored in the ash collection can 24. (St. 24)
The door device 14 of the heating and weighing chamber 5 is opened, and the sample pan 11 is returned to the measuring position of the balance pan by the robot hand 15. (St. 25) Thereafter, the heating metering chamber 5 and the sample pan 11 are cooled by exhausting the air in the heating metering chamber 5 by the deodorizing fan 13, and the initial state is restored. (St. 26)
[0017]
【The invention's effect】
As described above, according to the present invention, when an abnormality occurs, the sample sludge remaining in the sample pan in the middle of measurement is ashed and removed, and the return operation is performed using the function used by the measurement device in the measurement operation. Therefore, the operator can easily return to the initial state without requiring any work for removing the sample sludge, the work environment is improved hygienically, and the maintenance load is reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a measuring apparatus showing an embodiment of the present invention.
FIG. 2 is a flowchart showing a measurement procedure of the measurement apparatus.
FIG. 3 is a flowchart showing a return procedure of the measurement apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Measuring apparatus 4 Sludge collection room 5 Heating weighing room 6 Electronic balance room 7 Disposal room 8 Electronic balance 9 Balance dish 10 Sample sludge 11 Sample dish 12 Halogen lamp device 13 Deodorizing fan 14 Door device 15 Robot hand 16 Sludge supply system 17 Suction system 18 Drainage system 22 Compressed air supply system 27 Lamp controller 28 Indicator controller 29 Personal computer

Claims (1)

The sample pan is moved by the robot hand across the sampling position outside the heating weighing chamber, the measurement position of the weighing pan placed inside the heating weighing chamber, and the disposal position outside the heating weighing chamber, and sample sludge is collected on the sample pan at the sampling position. The sample sludge is heated to the set temperature by the heat source placed at the top of the heating and weighing chamber at the measurement position, and the drying process and the high temperature ashing process are performed. Is measured with a measuring instrument placed outside the heating weighing chamber in support of the weighing pan, and the residue on the sample pan is removed by suction at the disposal position, and then the sample pan is returned to the measuring position of the weighing pan and heated and weighed. In the measuring device that cools the heating measuring chamber by exhausting indoor air and returns to the initial state,
When the measuring device stops abnormally in the middle of the measurement operation, as a return operation to return to the initial state, place the sample pan at the measurement position and move to the ignition ashing process, after the ignition ashing process ends Remove the residue on the sample pan by suction at the disposal position, then return the sample pan to the measurement position of the weighing pan, and cool the heating and weighing chamber by exhausting the air in the heating and weighing chamber to return to the initial state. A method for measuring the weight of sample sludge.

Images