JPH10202034A - System for monitoring differential pressure of back washing of ceramic filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To timely execute the adequate action meeting the condition change of respective elements of a ceramic filter by detecting differential pressures between the inlets and outlets of the respective elements, computing the output signals thereof via an A/D converter, housing the results thereof to a disk and emitting a display and alarm. SOLUTION: The signals outputted by the differential pressure detectors 11a to 11f in the inlets and outlets of the respective elements of the ceramic filter are inputted to the A/D converter 1 for multiple channels and are converted to 16-bit signals. These 16-bit signals are inputted to a computer 2 and are converted to differential pressure values. The waveforms of these differential pressure values are analyzed and the differential pressure waveforms are computed by the computer 2. The results thereof are housed to a disk drive 5. The changes of the respective elements with lapse of time are displayed by a CRT 3. Further, the computed results decide the conditions by the prescribed values and an alarm 6 emits the alarm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ceramic filter backwash differential pressure monitoring device applied to a pressurized fluidized bed combustor or the like.

[0002]

2. Description of the Related Art Combustion gas generated by a pressurized fluidized bed combustor (hereinafter referred to as PFBC) and supplied to a gas turbine is purified by a ceramic filter. The details thereof will be described below with reference to FIG. explain.

[0003] In FIG. 4, the gas generated by the PFBC 15 is removed after coarse-grained ash is removed by the cyclone 16.
It is sent to the ceramic filter 13 through the pipe 17.
The gas sent to the ceramic filter 13 passes through each element 14 attached inside the filter, from which fine ash is removed, and is sent to a gas turbine via a pipe 19.

[0004] A backwash line 20 is connected to each of the elements 14 because the removed fine ash adheres thereto.
Each element 14 is set in the backwash line 2 in the set cycle.
The pressure is increased from 0, and the attached ash is removed.

[0005] In a conventional ceramic filter disposed between a pressurized fluidized bed combustor and a gas turbine, FIG.
The differential pressures at the entrance and exit of each element 14 detected by the differential pressure detectors 11a to 11f shown in FIG. 1 are displayed by a pen recorder, and the values are visually checked and calculated to determine the performance.

[0006]

In the conventional ceramic filter, as described above, the change in the differential pressure at the entrance and exit of each element shown in the pen recorder is visually read to determine the state of the increase in the differential pressure. , Could not respond quickly.

Also, since the change in the differential pressure is extremely fast,
It was difficult to read accurate numbers with a pen recorder. Furthermore, this recorder has a problem in feeding charts and the like, and is not suitable for long-time continuous measurement. The present invention seeks to solve the above problems.

[0008]

According to a first aspect of the present invention, there is provided a ceramic filter backwash differential pressure monitoring apparatus for detecting a differential pressure between an inlet and an outlet of each element provided in a ceramic filter. The signal output by the differential pressure detector is input through an analog / digital (hereinafter, referred to as A / D) converter, and the differential pressure value of each element before backwashing, the maximum differential pressure value during backwashing, and the differential pressure after backwashing. A computer that calculates the pressure value, a disk that inputs and records the calculation results of the computer, and a cathode ray tube (hereinafter, referred to as a CRT) that continuously displays the changes over time.
CRT), and inputting the calculation result of the computer, when the maximum value of the differential pressure during backwash exceeds the set value, and when the backwash rate obtained from the differential pressure value before backwash and the differential pressure value after backwash is the set value. It is characterized by having an alarm device for issuing an alarm when the pressure drops further and when the differential pressure value after the backwash exceeds a set value.

In the above, each signal output from the differential pressure detector provided in each element of the ceramic filter is input to a computer via an A / D converter. The time when the backwashing was performed, the differential pressure value before backwashing, the maximum differential pressure value during backwashing, the differential pressure value after backwashing, and the pressure waveform were calculated, and the calculated result was recorded on the disk and displayed. , The change over time of all data is continuously displayed on the CRT.

In addition, when the maximum value of the differential pressure during backwash exceeds a set value, when the backwash rate calculated by the differential pressure value before and after backwash falls below the set value, and when the differential pressure value after backwash increases to the set value. If it exceeds, the alarm will sound an alarm.

In the present invention, since a disk is used, comparison and analysis with past data can be performed, and since a CRT is used, monitoring of a pressure waveform at the time of backwashing of each element and its change with time can be performed. This makes it easy to grasp the backwashing performance and issues an alarm in a predetermined case, so that timely execution of appropriate treatment in accordance with a change in the status of each element becomes possible.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A ceramic filter backwash differential pressure monitoring apparatus according to one embodiment of the present invention will be described with reference to FIG.

The ceramic filter to which the monitoring device according to the present embodiment is applied is a PEBC as shown in FIG.
15 is used for purifying the combustion gas generated and supplied to the gas turbine, and backwashing of the plurality of elements 14 provided therein is performed in each set cycle.

The ceramic filter backwash differential pressure monitoring apparatus according to the present embodiment shown in FIG. 1 is connected to a plurality of elements provided inside the ceramic filter and detects differential pressures at inlets and outlets. 11f, an A / D converter 1 for inputting the output signals of the differential pressure detectors 11a to 11f and performing A / D conversion. The A / D converter 1 is connected to the A / D converter 1 via a computer communication cable 21 and converts digital signals. A computer 2 for inputting and calculating; a CRT 3 and a disk drive 5 connected to the computer 2;
A color printer 4 and an alarm 6 connected to the RT 3 are provided.

In the above, the signals output from the differential pressure detectors 11a to 11f which have detected the differential pressures at the entrance and exit of each element 14 of the ceramic filter are input to the multi-channel A / D converter 1 and input to the 16-bit A / D converter 1. Converted to a signal. The converted 16-bit signal is input to the computer 2 via the computer communication cable 21, and is converted into a differential pressure value in the computer 2.

FIG. 2 shows a differential pressure waveform of each element 14 detected by the differential pressure detectors 11a to 11f. The computer 2 analyzes this waveform and outputs a differential pressure value 7 before backwash shown in FIG. , The differential pressure maximum value 8 during backwash, the differential pressure value 9 after backwash, and the differential pressure waveform for 6 seconds are calculated. The differential pressure value 9 after backwashing is an average value for one second.

The result of this operation is recorded on the disk stored in the disk drive 5 together with the backwash time,
The change over time of each element 14 is displayed on the CRT 3 by switching. The data recorded on the disc can be retrieved and analyzed as needed. The image displayed on the CRT 3 can be hard copied by the color printer 4.

When the maximum value of the differential pressure during backwashing 8 exceeds a set value, when the backwash rate calculated from the differential pressure values before and after backwash 7 and 9 becomes lower than the set value, and when the differential pressure value after backwash 9 becomes 9 Is greater than the set value, the alarm 6 issues an alarm.

As a result, it is possible to accurately grasp the change in the status of each element of the ceramic filter, and to perform appropriate processing in a timely manner in accordance with the change.

[0020]

According to the present invention, there is provided a ceramic filter backwash differential pressure monitoring apparatus, comprising: a differential pressure detector for detecting a differential pressure between an inlet and an outlet of each element of a ceramic filter; and an A / D converter for outputting an output signal of the detector. A computer for inputting and calculating via a computer, a disk for inputting and recording the calculation results of the computer, a CRT for displaying the data, and an alarm device for issuing an alarm.
Analyzes can be performed to monitor the pressure waveform during backwashing of each element and its change over time, making it easy to grasp the backwashing performance. An apparatus capable of performing a treatment in a timely manner is realized.

[Brief description of the drawings]

FIG. 1 is a block diagram of a ceramic filter backwash differential pressure monitoring device according to an embodiment of the present invention.

FIG. 2 is a pressure waveform diagram of a differential pressure applied to each element of the ceramic filter according to the one embodiment.

FIG. 3 is a detailed view of FIG. 2;

FIG. 4 is an explanatory diagram of a ceramic filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 A / D converter 2 Computer 3 CRT 4 Color printer 5 Disk drive 6 Alarm 7 Differential pressure value before backwashing 8 Maximum pressure difference during backwashing 9 Differential pressure value after backwashing 11 Differential pressure detector 12 Capillary tube 13 Ceramic Filter 14 Element 15 PFBC 16 Cyclone 17 Piping 18 Piping 19 Piping 20 Backwash line 21 Computer communication cable

Claims (1)

[Claims] 1. A differential pressure detector for detecting a differential pressure between an inlet and an outlet of each element provided in a ceramic filter,
A computer for inputting a signal output from the differential pressure detector via an analog / digital converter and calculating a differential pressure value before backwashing, a maximum differential pressure value during backwashing, and a differential pressure value after backwashing for each element. The CRT that displays the discs that record by inputting the calculation results of the above and the continuous changes over time of each disc, and the differential pressure value before backwashing when the maximum pressure difference during backwash exceeds the set value by inputting the calculation results of the above computer The ceramic characterized by having an alarm which gives an alarm when the backwash rate obtained from the differential pressure value after backwash falls below the set value and when the differential pressure value after backwash exceeds the set value. Filter backwash differential pressure monitoring device.