JP3354299B2 - Automatic high-pressure and high-pressure sample water supply system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water quality control device for a boiler plant of a power plant, and more particularly to an automatic supply device for high-temperature and high-pressure sample water.

[0002]

2. Description of the Related Art In general, a boiler plant is provided with a water quality adjusting device for preventing a trouble caused by boiler water, that is, a decrease in thermal efficiency due to corrosion of a boiler, a turbine, or the like or adhesion of scale. This water quality control device is composed of an automatic supply device for high-temperature and high-pressure sample water for normal sampling (hereinafter, sometimes simply referred to as an automatic supply device) and a chemical liquid injection device for injecting a required chemical liquid. It is configured.

To explain the automatic feeder, in FIG. 2, high-temperature and high-pressure sample water collected from a boiler plant 10 is first cooled in a cooler 12 to a predetermined normal temperature, and then a pressure reducing mechanism 14 and an inflow / Constant head vessel mechanism 2 with outflow lines 16 and 18
At 0, the pressure is reduced to a predetermined pressure. The sample water at normal temperature and normal pressure is supplied to the downstream measuring device 24 via the piping system 22 to measure the water quality. It should be noted that the water quality adjustment device can achieve predetermined water quality adjustment by injecting a predetermined chemical solution into the boiler plant via a chemical solution injection device (not shown) based on the measurement result. is there.

However, in order to achieve accurate measurement in the automatic supply device, it is important to maintain the supply amount q of the sample water to the measuring device 24 at a constant pressure and a constant flow rate. For this reason, the automatic supply device generally includes a piping system 22.
The head valve mechanism 20 is provided with a flow regulating needle valve 26 in front of the head vessel mechanism 20, and the pressure reducing mechanism 14 is controlled by a pressure detector 28, a pressure setter 30 and a controller 32, so that its secondary The side pressure, that is, the pressure before the needle valve 26 is maintained at a predetermined constant pressure.

[0005] According to such a configuration, the sample water Q collected from the boiler plant 10 is caused to overflow the predetermined outflow amount ΔQ from the outflow line 18 in the head vessel mechanism 20 so that the supply amount of the water sample is supplied. Since q = Q-ΔQ can be set to a predetermined constant flow rate, accurate measurement can be achieved. Reference numeral 34 in the figure indicates a relief valve.

[0006]

However, the above-mentioned conventional apparatus for automatically supplying high-temperature and high-pressure sample water has basic disadvantages as described below.

That is, in the conventional automatic supply apparatus, as described above, the flow rate adjusting needle valve 26 controls the pressure at the preceding stage to a predetermined set pressure by the pressure reducing mechanism 14 to supply the sample water. Quantity q = Sampling quantity Q-Outflow quantity Δ
It is configured to keep Q constant. However,
Since the needle valve has a very narrow valve passage, if foreign matter is present in the handling liquid, a large number of foreign matter is deposited in the boiler plant sample water (particularly, the drum sample water). Occurs.

For this reason, the following problems have occurred in the automatic supply device. That is, when the needle valve is clogged, the passing flow rate (collected amount) Q first decreases, but at this time, the pressure in the preceding stage of the needle valve increases, so that the pressure reducing mechanism is controlled so as to further narrow its opening. .
Therefore, as a result, the flow rate Q further decreases. That is, the conventional automatic supply device has a basic difficulty that when the sampling amount Q decreases, it is further reduced without increasing it, in other words, in the opposite direction to the original control direction. Had. It is to be noted that if the amount of decrease exceeds the outflow amount ΔQ, the supply amount q of the sample water becomes insufficient, and accurate measurement becomes impossible. On the other hand, if the outflow amount ΔQ is set large in order to prevent such a shortage of the supply amount q of the sample water, it is apparent that the energy loss increases. Since the conventional automatic supply device requires a needle valve and the like as described above, it also has a disadvantage that the configuration becomes complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an automatic high-temperature and high-pressure sample water supply apparatus which can maintain the supply amount of sample water appropriately and efficiently and constantly and can be configured relatively easily. .

[0010]

In order to achieve the above object, an automatic hot water supply apparatus for a high temperature and high pressure sample water according to the present invention is provided. The head vessel mechanism includes a flow detector on its inflow line, and the decompression mechanism includes a vessel inflow through the flow detector. Control the secondary pressure to keep the volume constant,
The apparatus is characterized in that the supply amount to the measuring device is kept constant.

In this case, the pressure reducing mechanism can be configured to control the secondary pressure so that the inflow amount of the vessel is set as small as possible.

[0012]

When the amount of sample water sampled Q increases for some reason, for example, the outflow amount ΔQ from the head vessel mechanism, that is, the inflow amount ΔQ into the head vessel, also increases in response to the increase. In this case, in the present invention, the pressure reducing mechanism is controlled so as to eliminate the increase in the inflow amount ΔQ, that is, to maintain the inflow amount ΔQ constant. It is therefore clear that the sampling quantity Q and the supply quantity q are thereby kept constant and that accurate measurement is achieved. In this case, it is apparent that the energy loss can be suppressed to the minimum by setting the inflow amount ΔQ to be as small as possible, that is, zero or more.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of an automatic high-temperature and high-pressure sample water supply apparatus according to the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, the same components as those of the conventional device shown in FIG.
Detailed description is omitted.

In FIG. 1, the basic structure of the automatic supply device of the present invention is the same as that of the conventional one (see FIG. 2). Therefore, the description will be briefly repeated again for easy understanding. That is, the automatic supply device basically cools the high-temperature and high-pressure sample water collected from the boiler plant 10 to a predetermined normal temperature in the cooler 12, and then continuously cools the decompression mechanism 14 and the inflow / outflow lines 16 and 18. The pressure is reduced to a predetermined pressure in the head vessel mechanism 20. And this normal temperature, normal pressure sample water,
The water quality is measured by supplying the water to the downstream measuring device 24 via the piping system 22.

However, according to the present invention, in the above-described configuration, the head vessel mechanism 20 has the inflow line 1
6, a flow detector 40, and a pressure reducing mechanism 14
The flow rate detector 40, the flow rate setting device 42 and the controller 4
4 to control the pressure on the secondary side, that is, the pressure on the upstream side of the inflow line 16 of the head vessel mechanism 20, so that the vessel inflow (ie, outflow) ΔQ
Is kept constant.
Thus, the configuration is such that the collection amount Q from the boiler plant 10 and the supply amount q to the measuring device 24 are kept constant. In this case, the pressure reducing mechanism 14
Is controlled such that the vessel inflow amount ΔQ is set as small as possible.

More specifically, to explain more operatively, for example, when the pressure of the boiler plant 10 rises and the sampling amount Q of the sample water increases, the inflow amount ΔQ into the head vessel also increases. The increase is caused by the flow detector 4
If detected at 0, the pressure reducing mechanism 14 is controlled via the flow rate setting device 42 and the controller 44 to eliminate the increase in the inflow amount ΔQ and thereby keep the supply amount q constant. Activate

As described above, the automatic supply device according to the present invention controls the pressure reducing mechanism via the amount of sample water flowing into the head vessel mechanism to maintain the amount of sample water supplied to the measuring device constant. As compared with the conventional automatic feeding apparatus of this type, that is, a method of controlling the pressure reducing mechanism via the pressure at the preceding stage of the flow adjustment needle valve, the disadvantage due to the clogging of the needle valve and the like is eliminated. This is eliminated and the supply amount of the sample water is appropriately and efficiently maintained at a constant level, and a needle valve or a relief valve (see FIG. 2) is not required, so that the configuration is simplified. Therefore, accurate measurement can be achieved, and a reduction in manufacturing cost can be achieved. Furthermore, since the inflow of the vessel can be set to a flow rate as small as possible equal to or more than zero,
Energy loss can also be minimized.

While the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and many design changes can be made without departing from the spirit of the present invention. In addition, it is needless to say that the present invention can be applied to various processes other than the boiler plant in the same manner as described above.

[0019]

As described above, the automatic high-pressure and high-pressure sample water supply apparatus according to the present invention measures the high-temperature and high-pressure sample water through the cooler, the decompression mechanism, and the constant head vessel mechanism with inflow / outflow lines. The head vessel mechanism has a flow detector on its inflow line, and the decompression mechanism keeps the vessel inflow constant through the flow detector. By controlling the secondary side pressure and maintaining the supply amount to the measuring device constant,
The decompression mechanism can be controlled via the amount of sample water flowing into the head vessel mechanism, and the amount of sample water supplied to the measuring device can be kept constant. In other words, compared to the method in which the pressure reducing mechanism is controlled via the pressure at the previous stage of the flow control needle valve, the inconvenience due to clogging of the needle valve is eliminated, and the supply amount of sample water is kept appropriately and efficiently at a constant level. In addition to this, there is an advantage that a needle valve or a relief valve or the like is not required, and the configuration can be simplified.

Therefore, according to the present invention, accurate measurement can be achieved, and the manufacturing cost can be reduced.
In addition, since the vessel inflow rate can be set to a flow rate as small as possible, that is, zero or more, energy loss can be suppressed to the minimum.

[Brief description of the drawings]

FIG. 1 is a control system diagram showing an embodiment of an automatic supply device for high-temperature and high-pressure sample water according to the present invention.

FIG. 2 is a control system diagram showing a configuration of a conventional automatic supply device for high-temperature and high-pressure sample water.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Boiler plant 12 Cooler 14 Decompression mechanism 16 Inflow line 18 Outflow line 20 Head vessel mechanism 22 Piping system 24 Measuring instrument 40 Flow rate detector 42 Flow rate setting unit 44 Controller

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 62-99817 (JP, U) JP-A 3-61554 (JP, U) JP-B-56-12806 (JP, B2) JP-B-53 12226 (JP, Y2) Jiko 64-64 (JP, Y2) Toshiaki Ishihara, “Water Quality Management and Water Treatment Equipment 4. Water Quality Control Equipment”, Thermal and Nuclear Power Generation, Japan, Japan Nuclear Power Technical Association, 1992 October 15, Vol. 43, No. 10, p. 1234-1245 Toshiaki Ishihara, "Recent Water Management Technology 2. Automation", Boiler Research, Japan, Japan Boiler Association, February 1, 1992, No. 251, p. 16-19 (58) Field surveyed (Int. Cl. ⁷ , DB name) G01N 1/00-1/44 JICST file (JOIS)

Claims (2)

(57) [Claims] 1. An automatic high-pressure and high-pressure sample water supply device for supplying high-temperature and high-pressure sample water to measuring equipment via a cooler, a decompression mechanism, and a constant head vessel mechanism with an inflow / outflow line, wherein the head vessel mechanism comprises A flow rate detector is provided on the inflow line, and the pressure reducing mechanism controls the secondary pressure so as to maintain the flow rate of the vessel through the flow rate detector at a constant level, and keeps the supply rate to the measuring device constant. An automatic supply device for high-temperature and high-pressure sample water, characterized in that it is configured to perform 2. The automatic high-temperature and high-pressure sample water supply apparatus according to claim 1, wherein the pressure reducing mechanism controls the secondary pressure so that the inflow amount of the vessel is set as small as possible.