JPH07101083B2 - Boiler intermittent blower - Google Patents

Description

The present invention relates to an intermittent blower for a boiler.

[Conventional technology]

Boiler blow work has two purposes: to reduce the concentration of boiler can water and to discharge the boiler at the bottom of the can. For the former purpose of reducing the concentration of canned water, generally, a method of attaching a continuous blowing device and automatically and continuously blowing in small amounts from the vicinity of the boiler canned water surface is adopted. However, in order to discharge the latter, the intermittent blow has traditionally been
Workers regularly opened and closed the open / close valve of the blow pipe attached to the bottom of the boiler to intermittently blow out the oven.

[Problems to be solved by the invention]

Therefore, the timing of opening the on-off valve is often improper, and, for example, the dough sometimes accumulates too much or blows even if it is not accumulating too much.

In addition, depending on the boiler water, it has to be intermittently blown several times a day, which is a burden on the operator.

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned conventional problems, and intermittently blows a boiler that automatically determines when intermittent blowing should be performed and that intermittently blows without the need for an operator. The purpose is to provide a device.

[Means for solving problems]

The present invention relates to an on-off valve 2 capable of opening and closing a blow pipe 1 of a boiler.
And an evaporation amount detecting device 5 provided in the steam pipe 4 for directly measuring the evaporation amount of the boiler from the flow rate of the steam in the steam pipe 4, and the evaporation amount detected by the evaporation amount detecting device 5 is integrated to obtain an integrated evaporation. An intermittent blower for a boiler, comprising a controller 6 for opening the on-off valve 2 when the amount reaches a predetermined set value, the detector 10 for detecting blown water discharge, and the detector
A blow water detector 9 that outputs a reset signal to the controller 6 at the output of 10 is provided, and the controller 6 resets the integrated value of the evaporation amount when the reset signal is input from the blow water detector 9. It is a characteristic intermittent blower for boilers.

[Action]

The intermittent blower of the present invention integrates an evaporation amount detection device and an evaporation amount detected by the evaporation amount detection device, and when the integrated evaporation amount reaches a predetermined set value, an on-off valve provided in a blow pipe is provided. Since it is equipped with an opening control device, if the accumulated evaporation amount to reach the state where intermittent blowing should be performed is calculated in advance by experiments, etc. and set as a set value, it will be automatically set at the appropriate time when intermittent blowing is required. Can be blown to. Then, the discharge of blow water is directly detected by the detector 10, and the blow water detector 9 outputs a reset signal of the integrated evaporation amount to the control device 6 based on the output of the detector 10, so that high reliability is obtained. To be

〔Example〕

 Embodiments of the present invention will be described with reference to the drawings.

Reference numeral 1 is a blow pipe connected to the bottom of a boiler, which is provided with an on-off valve 2. Reference numeral 3 is a control device for automatically operating the on-off valve 2 based on the integrated evaporation amount of the boiler, and 5 is a detection device for detecting the evaporation amount of the boiler. In the present embodiment, a flow meter (for example, a pulse flow meter) provided in the steam pipe 4 is used as the detection device 5, and the flow rate is detected from the steam flow rate generated from the boiler. It can also be detected from the flow rate of water supplied to the boiler.

The control device 3 is provided with a control unit 6, a timer unit 7, a valve drive unit 8, and a blow water detection unit 9.

The control unit 6 integrates the evaporation amount from the integration start time point (for example, pulse count start time point) based on the flow rate signal (for example, pulse signal) from the detection device 5 to obtain the integrated evaporation amount (for example, the number of pulses corresponding thereto). Compared with the set cumulative evaporation amount (for example, the set pulse number) at which the intermittent blow should be performed, which is obtained by predicting by calculation, calculation, experiment, etc. When the number of pulses is reached, an output signal (for example, a count-up signal) is emitted.

The timer unit 7 outputs an operation signal that lasts for a predetermined time T in which the on-off valve 2 should be opened after receiving the output signal from the control unit 6.

The valve drive unit 8 sends an opening operation signal that lasts for a time T to the opening / closing valve 2 (for example, an electric ball valve), and holds the opening / closing valve 2 in the open state for the time T.

An electrode 10 is provided on the downstream side of the on-off valve 2 of the blow pipe 1 as a detection end for detecting the discharge of blow water, and is adapted to detect the start of blow, and the blow water detector 9 detects the signal from the electrode 10. An integration reset signal (eg, count reset signal) is output to the control unit 6 so as to reset integration (eg, count reset) in the reception control unit 6. Then, the amount of evaporation calculated for the next intermittent blow time is integrated.

Reference numeral 11 is a manual blow cock provided in the blow pipe 1 in parallel with the on-off valve 2.

Therefore, the set integrated evaporation amount of the control unit 6 is set to an appropriate value according to the property of the boiler water.

If the load is now large, the integrated evaporation amount reaches the set integrated evaporation amount at time t ₁ , and during the time T, the on-off valve 2 is automatically opened to perform the intermittent blow. When it is detected that the intermittent blow is performed, the integration is reset. Then, when the load is small, the set cumulative evaporation amount is reached at time t ₂ , and similarly, the blowing is automatically performed.

In this way, every time the accumulated evaporation amount reaches the set accumulated evaporation amount, the intermittent blow is automatically performed and the mash is discharged.

In this embodiment, since the electrode 10 and the blow water detector 9 are provided, the integration can be reset after confirming that the blow water is actually discharged.

〔The invention's effect〕

The blow device of the present invention integrates the evaporation amount and opens the on-off valve provided in the blow pipe each time the integrated evaporation amount reaches a predetermined set value, and also directly detects the discharge of the blow water and blows it. Since the integrated evaporation amount is reset when the water is discharged, it is possible to automatically and reliably blow the water at an appropriate time when intermittent blowing is required.

[Brief description of drawings]

FIG. 1 is a flow chart of the embodiment of the present invention, and FIG. 2 is a time chart thereof. 1 ... Blow pipe, 2 ... On-off valve, 3 ... Control device, 4 ...
... Steam pipe, 5 ... Detecting device, 6 ... Control unit, 7 ... Timer unit, 8 ... Valve drive unit, 9 ... Blow water detection unit, 10 ...
Electrode, 11 …… Blowcock.

Claims (1)

[Claims] 1. An on-off valve 2 capable of opening and closing a blow pipe 1 of a boiler.
And an evaporation amount detecting device 5 provided in the steam pipe 4 for directly measuring the evaporation amount of the boiler from the flow rate of the steam in the steam pipe 4, and the evaporation amount detected by the evaporation amount detecting device 5 is integrated to obtain an integrated evaporation. An intermittent blower for a boiler, comprising a controller 6 for opening the on-off valve 2 when the amount reaches a predetermined set value, the detector 10 for detecting blown water discharge, and the detector
A blow water detector 9 that outputs a reset signal to the controller 6 at the output of 10 is provided, and the controller 6 resets the integrated value of the evaporation amount when the reset signal is input from the blow water detector 9. Characteristic intermittent blower for boiler.