JPH0722570Y2 - Concentration blow system abnormality detection device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is provided with an automatic blower device attached to a boiler for maintaining a high degree of dryness of generated steam to prevent a failure such as clogging of a blower system occurring in the device. The present invention relates to a concentrated blow system abnormality detection device that can be detected and dealt with early.

(Prior Art) Generally, in boilers, the can water in the boiler is concentrated when the amount of vapor generated and utilized increases as it continues to be heated at high temperature for a long time, and the injected chemical liquid is used. The concentration and the residual density of detoxifying impurities also become large, and as a result, it becomes difficult to maintain the high dryness of the generated steam.

Therefore, conventionally, in a separator downcomer of a boiler, a concentration blow valve that discharges can water to the outside by a blow pipe when it is normally closed and opened is installed via a strainer, , A control unit is provided in a circuit connecting the electric conductivity measurement sensor installed in the downfall pipe, and the sensor detects a change in electric conductivity in proportion to the concentration of the can water in the downfall pipe, When the conductivity exceeds a specified value, the control unit is controlled by a control signal generated by the sensor to open the concentration blow valve to discharge highly concentrated canned water to the outside, and at the same time, supply water with the discharge of the canned water. When the water is diluted with new can water that is automatically replenished into the can through the device, the concentration of the whole can water decreases and the electric conductivity of the can water drops below a specified value. Disappears and the concentration blow valve closes itself The automatic blow device formed thereby achieving a high dryness degree maintenance of steam generated is attached to the boiler.

(Problems to be solved by the invention) However, in the conventional automatic blower attached to such a boiler, as described above, a blow operation signal is emitted when the concentration of the can water progresses and the electric conductivity exceeds the specified value. When the concentrated blow valve is opened to discharge the concentrated canned water, the concentrated canned water is diluted by the new canned water supplied instead, and the concentration of the entire canned water decreases, and when the electrical conductivity falls below the specified value, the signal disappears and the concentrated blow is performed. The operation of repeating the valve self-closing and stopping the discharge of canned water is repeated.At this time, if the blow system such as the blow pipe or strainer is clogged or the concentrated blow valve is malfunctioning, the concentrated canned water will not be discharged, so There is a problem that the operation signal continues to be concentrated even if it is left as it is, and it is difficult to detect the above failure, so it is difficult to maintain the high dryness of the generated steam. -If can water leaks from the system more than necessary, there is a problem that it will lead to heat loss and reduce the operating efficiency of the boiler.

The present invention has been made in view of the above circumstances, and controls an automatic blower device attached to a boiler that emits a blow operation signal and discharges highly concentrated canned water detected by an electric conductivity measurement sensor by opening a blow valve. The circuit connecting the section and the temperature sensor provided on the blow valve downstream side is provided with a determination section for comparing the blow operation signal emitted by the control section and the temperature change in the blow valve downstream detected by the temperature sensor, The aim is to detect abnormalities in the enrichment blow system early from the tendency of temperature change and deal with them to improve the operation efficiency of the boiler.

(Means for Solving the Problems) The features of the concentrated blow system abnormality detection device of the present invention for solving the above-mentioned problems are that the concentrated blow valve and the electric conductivity measurement sensor applied to boiler can water are connected to them. By including the control unit, when the electric conductivity of the can water detected by the sensor exceeds a specified value, the concentration blow valve is opened via the control unit by a signal from the sensor, In a configuration of an automatic blower that operates as if operated, a temperature sensor is installed downstream of the concentration blow valve, and a blow operation signal from the control unit and the temperature sensor are provided in a circuit connecting the temperature sensor and the control unit. In the configuration, a determination unit for comparing the temperature change on the downstream side of the blow valve detected in 1) is provided.

(Operation) According to the concentration blow system abnormality detection device of the present invention having the above-described structure, however, the controller of the automatic blower attached to the boiler is connected to the temperature sensor provided on the downstream side of the concentration blow valve. The determination unit provided in the circuit has a high concentration of canned water,
Whether or not there is a blow operation signal from the control unit depending on the dilution,
The temperature change on the downstream side of the concentrating blow valve that moves up and down due to the discharge and stop of the hot canned water is constantly measured and displayed. At this time, when the blow system operates normally, the concentration always changes to a constant value. The temperature on the downstream side of the blow valve rises when the can water is discharged, and then decreases after the discharge is stopped.

Therefore, if there is any difference between the tendency of the above-mentioned temperature change at each blow actuation signal measured at the judgment unit and the time of the stoppage of the blow and the tendency at the time of normal blow actuation, the blow system is abnormal due to some failure. Can be determined to have occurred,
Since the boiler can be dealt with promptly, safe operation of the boiler is maintained, and the above-mentioned problem is solved.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing an example of the concentration blow system abnormality detection device of the present invention.

In the figure, (1) is a boiler, and a water supply pipe (2) of a water supply device equipped with a check valve, a filter, a chemical injection device, etc. is connected to the lower part of the boiler (1) so as to communicate with the water supply pipe (2). The other end of the water is connected to a water source such as a water supply or a well, and the water of the water source is filtered by the operation of the water supply pump (P) to become a chemical canister water into which a chemical solution has been injected and is supplied into the boiler (1) can. Further, as shown in the figure, a separator (11) is connected to one side of the boiler (1) through a steam communication pipe (12) and a downcomer pipe (3) so as to communicate with the upper and lower parts of the boiler (1) inside the can. Further, a blow pipe (6) having an electromagnetic valve-opening concentration blow valve (4) and a strainer (5) inserted therein is connected to the middle portion of the precipitation (3) so as to communicate therewith.

( C ) is a known automatic blower, which is detected by the sensor (7) in the circuit connecting the electrical conductivity measuring sensor (7) installed downstream of the downcomer pipe (3) and the concentration blow valve (4). When the electric conductivity of the downstream portion of the downcomer pipe (3) that changes in proportion to the concentration of the can water exceeds a specified value, the sensor (7) outputs a control signal to control the electric conductivity, and the normal closing is performed. A control unit (8) for issuing a blow operation signal for opening the concentrated blow valve (4) is provided.

Then, the control unit (8) of the automatic blower ( C ) has a blow operation signal for opening the concentration blow valve (4) by the control signal from the sensor (7) and the concentration operation. A determination unit (9) for determining an abnormality in the blow system by comparing the temperature signal of the temperature sensor (10) installed on the downstream side of the blow valve (4) is also provided.

The temperature detected by the sensor (10) may be transmitted to the determination unit (9) via a circuit and constantly measured and displayed.

Next, an explanation will be given of a concrete example of detection of abnormality of the concentration blow system using the device of the present invention. The concentration blow valve (which is detected by the temperature sensor (10) and is constantly measured and displayed on the determination unit (9) ( 4) When the blow system operates normally, the downstream temperature rises when the high-temperature can water is discharged, and the temperature decreases when discharge stops, when the blow system normally operates.

At this time, in the determination unit (9), the temperature of the downstream side of the concentration blow valve (4) after the control unit (8) transmits the blow operation signal repeatedly and intermittently issued to the concentration blow valve (4) and after the suspension. If the temperature change is different from the tendency at the normal time and the temperature rise is not recognized after the blow operation signal is transmitted, there is a poor drainage of can water due to clogging of the blow system, and the blow operation signal is stopped. If the temperature rise is still recognized after the transmission, it is possible that the concentrated blow valve (4) is not properly closed and that the can water leaks. Furthermore, the blow signal is emitted and the temperature difference within the suspension time is different from that during normal operation. Even if the amount is smaller than the above, it is considered that there is leakage of can water, so in all of these cases, it can be determined that an abnormality has occurred in the concentration blow system.

When an abnormality is detected, the fact is notified by an appropriate notifying means.

(Effect of the Invention) As described above, the present invention has a temperature sensor installed on the downstream side of the concentrating blow valve of the automatic blower provided with the boiler, and the temperature sensor is connected to the controller of the automatic blower. Since the determination unit for comparing the presence or absence of the blow operation signal generated by the control unit and the temperature change on the downstream side of the blow valve detected by the temperature sensor is provided, after the blow operation signal is transmitted,
It is possible to immediately determine whether the operation of the concentrated blow system is normal or abnormal by simply comparing the tendency of temperature change on the downstream side of the blow valve after the suspension of communication with the temperature change data during normal blow operation. It is extremely useful in practice, for example, it is possible to quickly deal with the occurrence of the occurrence, maintain a high dryness of the boiler, and facilitate maintenance management to improve the operation efficiency of the boiler.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of the concentration blow system abnormality detection device of the present invention. ( C ) …… Automatic blower, (1) …… Boiler, (3)
…… Separator downcomer, (4) …… Concentration blow valve,
(7) ... electric conductivity measurement sensor, (8) ... control section, (9) ... determination section, (10) ... temperature sensor.

Claims (1)

[Scope of utility model registration request] 1. A concentration blow valve (4) applied to boiler water of a boiler (1), an electric conductivity measuring sensor (7), and a control section (8) connected to these, whereby the sensor is provided. When the electric conductivity of the can water to be detected exceeds a specified value, the signal from the sensor opens the concentration blow valve via the control unit, and the automatic blow device (C) operates as if operated. In the configuration, a temperature sensor (10) is installed on the downstream side of the concentration blow valve, and a blow operation signal from the control unit and a blow valve downstream detected by the temperature sensor are provided in a circuit connecting the temperature sensor and the control unit. An enrichment blow system abnormality detection device comprising a determination unit (9) for comparing a temperature change on the side.