JPS6182854A - Operating method of electrostatic precipitator - Google Patents

Abstract

PURPOSE:To operate automatically an electrostatic precipitator always in the optimum charged state by subjecting the optimum value of spark frequency to an arithmetic processing on basis of a specified formula to calculate the preset value. CONSTITUTION:In an electrostatic precipitator provided with a charging appara tus supplying DC high voltage to a dust collecting part, the arithmetic value of the gate interrupting time (t) in spark discharge detection period, the voltage peak value Vp and the spark frequency (n) is applied to a theoretical equation I for dust collecting performance and the spark frequency making the dust collecting performance maximum is obtained. The upper limited value under charging is computed and treated to set automatically the spark frequency. By this method, the optimum intermittent charging automatical operation is performed in accordance with the operating state of the electrostatic precipita tor.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to optimally controlling the charging state of an electrostatic precipitator (hereinafter abbreviated as EP) that is equipped with a charging device that supplies a DC high voltage to a dust collecting section. E, which aims to improve IP performance and save labor, from K
, P.

[Conventional technology]

Generally, IP includes a power supply device that generates high DC voltage.
The current from this power supply gives an electric charge to the dust introduced into the EP, and the charged dust is collected by the Coulomb force generated by the high electric field. This is to separate and remove dust from the gas by attaching iK. In the conventional power supply device for such an EP, for example, as shown in figure g7,
AC power supply person, C is Nyris! It is adjusted by controlling the phase of the Nyristor 2 with the ignition signal from the control device 1, and passes through the high voltage transformer 3, rectifier 4, and DC reactor 5.
Supplied to EP6. In this case, the current detector 1 and the voltage detector 8 detect the current and voltage supplied to the EP 6, respectively, and feed them back to the regulator control device 1.

[Problem that the invention seeks to solve]

In such EPs, in charging conditions where spark discharge occurs frequently, the appropriate spark frequency has conventionally been set by manual operation of the spark setting device 9 based on the operator's experience. It required advanced driving techniques, and it was difficult to respond immediately to changes in fuel and combustion conditions.

The present invention was proposed in order to solve the above-mentioned situation, and calculates by applying the calculated values of the gate cut-off time and voltage peak value at the time of spark discharge detection and the spark frequency to the theoretical formula of dust collection performance. As a result, we obtained the spark frequency that maximizes the dust collection performance, and applied this to the above value (
The purpose of the present invention is to provide an EP operation method that performs optimal operation of the EP by automatically setting the spark frequency by calculating the gate cut-off time, the calculated value of the voltage peak value, and the spark intensity. It is something.

[Means for solving problems]

The method for operating an IP according to the present invention includes determining the gate cut-off time t during charging, the voltage peak value Vp, and the spark frequency n in an EP equipped with a charging device that supplies a DC high voltage to the dust collecting section. It is characterized by controlling the charge so that the maximum value nB is achieved.

[Effect]

The EP operating method according to the present invention is based on the control parameters (gate and interruption time) of the DC high voltage power supply and the data during operation (1
It focuses on the pressure peak value, actual spark frequency) K, performs arithmetic processing obtained from the theoretical formula of dust collection performance, and automatically sets the optimal spark bottle degree according to the operating conditions of the xp.
In an EP that is equipped with a charging device that supplies a DC high voltage to the dust collecting section and a means for detecting a voltage signal from the charging device, the control device controls the gate cut-off time, voltage peak value Vp, and spark frequency during charging. Process the calculated value of
By automatically setting the spark bottle degree during charging, the above Σ
By operating the P, the actual zp charging voltage waveform and the dust collection theory are combined based on the actual data, and the dust collection theory formula can be created directly using software, making it easy to achieve 1cE.
This allows for optimal charging operation of P.

Please note that the applicant's application @Application 59-0178
In No. 04, the control device periodically controls the voltage peak value vp.
The intermittent charging automatic operation that maximizes the dust collection efficiency is performed by detecting the average value Vm of the voltage and voltage, and setting the spark frequency to the maximum value Vp:<vm based on the comparison between the new and old data. However, in the present invention, the control parameters (gate cut-off time) and the data during operation (peak voltage value, actual spark frequency) are calculated by fitting them to a dust collection theoretical formula, and the calculation process is performed according to the operating status of the IP. The present invention provides an optimal intermittent charging automatic operation machine by automatically setting the optimal spark frequency.

〔Example〕

An embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows an EP used to carry out the method of the present invention.
2, 3, and 4 are explanatory diagrams for explaining the method of the present invention; FIG. 5 is a flowchart of the automatic intermittent charging control program in FIG. 1;
FIG. 6 is a block diagram of the microcomputer unit shown in FIG. 1.

In Fig. 1, 12 is a transistor circuit, 13 is a high voltage transformer, 14 is a rectifier, 15 is a DC reactor, and 16 is an E
P and I7 are current detectors, 18 is a voltage detector, 20 is a control device, and 21 is a microcomputer unit.

As shown in FIG. 1, the Nyristor circuit 12 includes an AC power source A,
C is supplied, and AC current [A,
C is input to the primary side of the high voltage transformer 13. An AC power source C is input from the secondary side of this high voltage transformer 13 to a rectifier 14, and this rectifier 14 consists of a diode, a capacitor, etc., and passes through a DC reactor 15.
A DC high voltage is input to the discharge electrode of ZI"16, and this f, PI3 is a collection artw electrode B to which dust etc. in the gas charged by the corona discharge of the discharge electrode A is attached.
It is equipped with

Further, a voltage detector 18 for detecting a voltage signal Vt from the secondary side of the high voltage transformer 13 is provided. This voltage detector 18 is
The detected voltage signal vI is input to a microcomputer unit 2 included in the control device fl120. The automatic control program shown in FIG. 5 is input to this -r icon unit) 21, and the voltage detector 18
The voltage peak value Vp of the voltage signal Vl from and the spark frequency (number of spark discharges) n obtained by spark discharge detection are integrated, and the spark frequency during charging is automatically changed based on the value obtained by arithmetic processing. , outputs a control signal C (Nyristor ignition signal) to the tillerister circuit 12 at the optimum spark frequency, and controls the switching operation of the tillerister circuit 12. Also ζ
A current detector 12 is installed on the primary side of the high-voltage transformer 13-, and the current detector 12 is configured to feed back to the control device [21]. When supplied to the discharge electrode A of EPI 6, dust etc. in the gas is charged by the Delona discharge of the discharge electrode λ. This charged dust etc. adheres to the grounded collecting electrode B due to electrostatic force, and the gas It is possible to separate and remove dust etc. from inside.

Next, the operation of one embodiment of the present invention will be explained. first,
The processing and principle within the microcomputer unit 21 of the method of the present invention will be explained. The ICP voltage V detected by the voltage detector 18 in FIG. 1 is processed in the microcomputer unit 21 shown in FIG. 1K6 and outputted from the control device 20 as a control signal C. The order is as follows: (The charged voltage V of the IIEP passes through the isolation amplifier 31 and the λ/D converter 32 at a constant cycle, and then passes through the central processing unit 33 (hereinafter referred to as C
0 (21CPu5sC is N pressure O beam NLVp 0Wl
H4° The number of spark discharges is integrated by the spark discharge detection.

(3) By checking the peak value vp of this voltage and the number of spark discharges, it is processed according to the operating conditions! ! The spark frequency is changed to the appropriate spark frequency.

(See Figure 5).

Next, the spark placement setting value explained above is calculated based on the following principle.

In the charging situation shown in Figure 2, the EP@electric voltage (average value) is Vm = Vp・1−vp・t・n =Vp(1−nt) ・・・・・・+11 On the other hand, the EP dust collection Efficiency (η) is: Person η = 1-eQ (2)
ω=appetizer・vp−vm (3) Here, Vm is the voltage indicated by the voltmeter (average value) (KV), t is the voltage caused by sparks, and the interruption time (minutes), and Vp is the peak value of the voltage ( XV) ω is the moving speed of dust, e is the base of the natural logarithm, and is a constant.The dust collection area Q is the amount of gas to be processed. ...(4)
...(5) Next, to examine the change in the function before and after the inflection point, you can find it by ticking from equation (5).

Therefore, from the above, the graph of equation (6) becomes K as shown below, so the spark bottle degree f&optimal value is as follows.

Therefore, in the present invention, the optimum value of spark frequency is calculated based on (7) 2 to obtain the set value, and the EP load 't! Detects L℃ pressure by numbering CVpo) and detects the number of spark occurrences by pcna)
By performing arithmetic processing, the optimum spark bottle degree n1 K
If set, it will be possible to achieve optimal intermittent load 2 automatic operation for EP. It has been confirmed and demonstrated in a real root test that this effect is generally applicable to EP exhibiting reverse ionization.

In FIG. 6, 34 is a memory (ROM) in which the program is stored, 35 is a % port, 36 is an operator console interface, 37 is an operator console, 38 is a memory (RAM), and 39 is a 1)/A conversion circuit. It shows.

〔Effect of the invention〕

As described above, in the conventional spark discharge control method, when charging is performed with frequent spark discharges, the control parameters are set manually based on the operator's experience, which requires advanced operating skills. In addition, it has been difficult to respond immediately to changes in criminal records and conditions of criminal charges, but according to the present invention, the following excellent effects can be obtained.

! 1) Conventional operating techniques such as those mentioned above are no longer required, resulting in significant labor savings.

(2) Ef' can always be kept in the optimal female charge state.

(3) Significant energy savings can be expected as the charging device can be automatically operated optimally.

[Brief explanation of drawings]

Figure 1 shows an embodiment of the EP used to carry out the method of the present invention. Figure 2, Figure 3, and Figure 4 are explanatory diagrams for explaining the method of the present invention. The figure is a flowchart diagram of the intermittent charging automatic control program in No. 11,
Fig. flcG is a configuration diagram of the microcomputer unit in Fig. 1, and Fig. 7 is a diagram showing a conventional example. 12... Thyristor circuit, 13... High voltage transformer, 1
4... Rectifier, 1s... DC reactor, 16...
・EP, J7... Current detector, 18... Voltage detector, 20... Control) 1 R, x 1... Microcomputer unit. Applicant's sub-agent Patent attorney Takehiko Suzue Figure N1 Figure 2 Figure N3 Figure O Figure 4'dn Figure 5 Figure 6

Claims (1)

[Claims] In an electrostatic precipitator equipped with a charging device that supplies a DC high voltage to a dust collecting section, the gate cut-off time t during charging, the voltage peak value Vp, and the spark frequency n are determined, and n_3= 1/t-(Vp)/[2(dVp)/(dn)
] A method of operating an electrostatic precipitator, characterized in that charging is controlled so that the maximum spark frequency value n_3 obtained from the formula.