JP2012127834A - Liquid sampling/measuring system using back pressure valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid sampling/measuring system facilitating the maintenance and capable of reducing the cost by a possible simple structure.SOLUTION: The liquid sampling/measuring system includes a sub-line that is branched from a main line and communicated with the main line, the sub-line is formed with a sampling/measuring mechanism unit, and the sampling/measuring mechanism unit is sequentially provided with a back pressure valve and a measuring instrument towards the downstream side. During operation when the main line passes liquid, the back pressure valve is "open" to alow measurement liquid, or processing liquid to pass through the measuring instrument disposed in the downstream side and, when stopping the operation where the main line passes no liquid, the back pressure is "closed". The liquid sampling/measuring system is configured to measure the liquid quality by the measuring instrument installed in the downstream side during the operation when the back pressure valve is "open".

Description

  The present invention relates to a liquid sampling measurement system including a sampling measurement mechanism unit that can periodically perform the quality of treated water in a sub-line, and in particular, a simple valve mechanism without using a complicated automatic control valve. The present invention relates to a liquid sampling measurement system that can simplify the measurement mechanism and reduce the amount of discarded fluid to be measured.

  For example, the boiler water used as the boiler medium is preliminarily alkali-treated and phosphate-treated before being stored in the boiler water supply tank in order to suppress corrosion of the heat transfer pipes and pipes. Then, chemical treatment such as volatile substance treatment is performed.

  For example, NaOH is used as a pH adjuster, and further, a material obtained by adding phosphate to NaOH as a sludge control agent is used. In addition, when NaOH is used, alkaline corrosion occurs when a high temperature, high pressure, and high concentration atmosphere is reached, and therefore, phosphate treatment and volatile substance treatment are also applied.

  Further, with respect to boiler water in a recent boiler apparatus, first, most of the dissolved oxygen is mechanically removed, and then the remainder is chemically removed. Examples of the mechanical de-dissolved oxygen treatment include a treatment using a degassing heater, and the chemical de-dissolved oxygen treatment uses, for example, a deoxygenating agent such as hydrazine or sodium sulfite. The processing that was performed is performed.

  In any case, it is necessary to inspect whether raw water such as clean water or industrial water maintains a desired water quality before being stored in a water supply tank, for example. That is, it is necessary to perform sampling (off-line) measurement. When performing the sampling operation, it is common to use an automatic valve in order to prevent loss (blow) of the fluid under measurement when water is not flowing.

JP 2003-236532 A

  However, the sampling system using an automatic valve has a disadvantage that the equipment cost is high and the control itself is complicated, so that the total cost becomes extremely high.

  Under such circumstances, the present invention has been invented, and an object of the present invention is to provide a liquid sampling measurement system that is simple in structure, low in cost, and easy to maintain. is there.

  In order to solve the above-described problems, the inventors of the present application have conducted intensive research.As a result, the difference in pressure between the pipes during operation and when the operation is stopped can be utilized without using a so-called expensive automatic control mechanism. The inventors have found that a desired purpose can be achieved by arranging and using a pressure valve on the upstream side of the measuring meter, and have arrived at the present invention.

  That is, the liquid sampling measurement system of the present invention has a sub-line branched from the main line and communicating with the main line, and the sub-line has a sampling measurement mechanism section, and the sampling The measurement mechanism section has a back pressure valve and a measuring meter in order toward the downstream side, and the back pressure valve is in an “open” state during operation when the main line is passing liquid, The measuring liquid that is the processing liquid can pass through the measuring meter that is arranged, and the back pressure valve is in the `` closed '' state when the operation is stopped when the main line is not passed. During the operation in which the back pressure valve is in the “open” state, the liquid quality is measured by a measuring meter installed on the downstream side.

  Further, as a preferred aspect of the liquid sampling measurement system of the present invention, the back pressure valve is in an “open” state during operation in which the main line is in fluid flow and the back pressure valve operating set pressure or higher, and the downstream side The back pressure valve can be passed through a measuring meter disposed at the time of operation stoppage when the main line is not passed or when the back pressure valve is less than the set operating pressure of the back pressure valve. During the operation, the device is in the “closed” state, and during the operation in which the back pressure valve is in the “open” state, the liquid quality is measured by the measuring meter installed on the downstream side. Is done.

  Moreover, as a preferable aspect of the liquid sampling measurement system of the present invention, a liquid processing unit for adjusting the liquid quality of the supplied stock solution, and a processing liquid storage tank for storing the processed processing liquid And a main line connecting these liquid processing units and the processing liquid storage tank, and a sub-line branched from the main line and communicating with the main line, the sub-line includes a sampling measurement mechanism unit The sampling measurement mechanism unit has a back pressure valve and a measuring meter sequentially toward the downstream side, and the back pressure valve feeds the processing liquid from the liquid processing unit to the processing liquid storage tank. During operation that exceeds the set operating pressure of the back pressure valve, it is in an “open” state so that the processing liquid can pass through a measuring meter disposed downstream, and the back pressure valve is a liquid processing unit. When the operation is stopped when the supply of the processing liquid to the processing liquid storage tank is stopped or during the operation at a pressure lower than the operation pressure setting of the back pressure valve, the back pressure valve is in the “closed” state. During operation in the “open” state, the liquid quality is measured by a measuring meter installed on the downstream side.

  Moreover, as a preferable aspect of the liquid sampling measurement system of the present invention, the measurement meter is configured to be a pH measurement meter.

  The liquid sampling measurement system including the sampling measurement mechanism of the present invention has a sub-line branched from the main line and communicating with the main line, and the sampling measurement mechanism is formed in the sub-line. The sampling measurement mechanism unit has a back pressure valve and a measuring meter in order toward the downstream side, and the back pressure valve is in operation while the main line is in fluid flow and the operating pressure of the back pressure valve is higher than the set pressure. `` Open '', and the measurement liquid, which is the treatment liquid, can pass through the measuring instrument disposed downstream, and the back pressure valve is used when the operation is stopped when the main line is not flowing or when the During operation with the pressure valve operating below the set pressure, it is in the “closed” state, and during operation with the back pressure valve in the “open” state, the liquid quality is measured with a meter installed downstream. It is configured so that Without using an expensive automatic control that, as far as possible simplified structure, and that at a lower cost becomes easy maintenance, it expresses very excellent effect.

  The installation of a back pressure valve on the upstream side of the measuring meter, expecting to open and close in response to fluctuations in the pressure on the upstream side of the back pressure valve, and using it like an automatic valve is a very original that does not exist in the past. It is a technical idea.

FIG. 1 is a diagram showing a schematic process flow showing treatment of boiler water as an example of a liquid sampling measurement system including a sampling measurement mechanism unit. FIG. 2 is a cross-sectional view showing a schematic configuration of a back pressure valve incorporated in the sampling measurement mechanism.

  Hereinafter, as a preferred example of the liquid sampling measurement system including the sampling measurement mechanism unit of the present invention, the boiler water treatment will be described, but the present invention is not particularly limited to this embodiment. Furthermore, in the present invention, the sample liquid to be sampled is not limited to water, but can be applied to various liquids.

  FIG. 1 is a schematic process flow diagram showing treatment of boiler water as an example of a liquid sampling measurement system including a sampling measurement mechanism. FIG. 2 is a cross-sectional view showing a schematic configuration of a back pressure valve incorporated in the sampling measurement mechanism.

  As shown in FIG. 1, from the upstream side of the process flow for treating the boiler water, the raw water storage tank 10 (raw liquid storage tank 10), the water treatment unit 20 (liquid treatment unit 20), the treated water storage tank 60 (treatment) A liquid storage tank 60) is disposed, and treated water (treated liquid) is sent to the boiler via these devices.

The raw water storage tank 10 stores water to be treated such as clean water or industrial water.
For example, treated water that has been subjected to predetermined treatment by the water treatment unit 20 that is subjected to chemical treatment or water softening treatment is sent to the treated water storage tank 60 and stored.

  As shown in FIG. 1, the water treatment unit 20 and the treated water storage tank 60 are connected by the main line 100, and the sub line 110 communicates with the main line 100 from the middle of the main line 100. Branched. “Branched in a communicating state” means that when the main line 100 is in a water-permeable state, an action is also taken to cause water to flow in the branched sub-line 110.

  The distinction between the main line and the sub-line at the time of branching is determined by the amount of fluid flowing in the pipe. That is, it is determined by (fluid amount Qm of main line)> (fluid amount Qs of sub-line).

  A sampling measurement mechanism 30 is formed in the sub line 110 branched from the main line 100. As shown in FIG. 1, the sampling measurement mechanism unit 30 is configured by sequentially including a back pressure valve 40 and a measurement meter 50 toward the downstream side. That is, the back pressure valve 40 is arranged upstream of the measuring meter 50. The measuring meter 50 measures various physical properties such as pH, hardness, turbidity, dissolved oxygen, electrical conductivity, and various dissolved ion amounts of the liquid to be measured, and is not particularly limited.

  In the process shown in FIG. 1, the back pressure valve 40 is in an “open” state during operation in which the main line 100 is passing water and is equal to or higher than the operation set pressure of the back pressure valve. That is, the back pressure valve 40 is in an “open” state during operation in which treated water is being sent from the water treatment unit 20 to the treated water storage tank 60 at a pressure higher than the set pressure of the back pressure valve. The treated water can pass through the measuring meter 50 arranged on the downstream side.

  On the contrary, the back pressure valve 40 is in a “closed” state when the operation is stopped when the main line 100 is not watered or during operation at a pressure lower than the set pressure of the back pressure valve. That is, the back pressure valve 40 is in a “closed” state when the supply of treated water from the water treatment unit 20 to the treated water storage tank 60 is stopped or during operation at a pressure lower than the operation pressure setting of the back pressure valve.

  The quality measurement of the treated water by the measuring meter 50 is performed during the operation in which the back pressure valve 40 installed on the upstream side is in the “open” state. In addition, it can be said that there is no problem since the water supply to the treated water storage tank 60 without measuring the water quality immediately after the start of operation is for boilers, for example.

  In the present invention, the operation set pressure at which the back pressure valve 40 is opened is Pb, and the pipe internal pressure of the main line 100 during operation in which treated water is being sent from the water treatment unit 20 to the treated water storage tank 60 is P1. When the pipe internal pressure of the main line 100 during the operation stop when the water supply of the treated water from the water treatment unit 20 to the treated water storage tank 60 is stopped is P0, the operation is performed so as to satisfy the condition of P0 <Pb ≦ P1. A set pressure Pb is set.

  The back pressure valve 40 includes a mechanism for releasing the pressure to the downstream side through the valve when the upstream fluid pressure becomes larger than the set pressure.

  FIG. 2 is a simplified cross-sectional structure diagram illustrating an example of the back pressure valve 40. As shown in FIG. 2, the back pressure valve 40 includes a diaphragm 43 for pressure adjustment, a spring 42 placed on the diaphragm 43, a handle 41 for adjusting the pressing force by the spring 42, and the diaphragm 43. It has the valve body set 44 and 45 which interlocks, and is comprised. And the back pressure valve 40 in this invention opens and closes a valve in response to the change of an upstream pressure, and exhibits the effect | action as if an automatic valve.

  During operation in which treated water is being sent from the water treatment unit 20 to the treated water storage tank 60 at a pressure higher than the set pressure of the back pressure valve, the back pressure valve 40 is “open”, so that the sub-line 110 is in a water passage state. After measuring the quality of the treated water by the measuring instrument 50, the treated water that has been measured and inspected is discarded from the end of the sub-line as shown (see line 120).

  As shown in FIG. 1, the present embodiment illustrates a case where treated water stored in the treated water storage tank 60 is used as boiler treated water. The treated water stored in the treated water storage tank 60 is sent directly or through several steps to the boiler.

  In the present invention, the measurement target water in the sampling measurement mechanism unit has been described as boiler treated water. However, the present invention can be applied to other processes, and is not particularly limited.

  As described above, the liquid sampling measurement system of the present invention has a sub-line branched from the main line and communicating with the main line, and the sampling measurement mechanism section is formed in the sub-line. The sampling measurement mechanism has a back pressure valve and a measuring meter in the downstream direction, and the back pressure valve is arranged on the upstream side of the measuring meter. Is in the open state during operation that exceeds the set operating pressure of the back pressure valve, and the measurement liquid that is the processing liquid can pass through the measurement meter arranged downstream. The back pressure valve is in the “closed” state when the operation is stopped when the main line is not circulated or when the operation is under the set pressure of the back pressure valve, and the back pressure valve is in the “open” state. During operation, the measuring instrument installed on the downstream side Since the measurement of the quality or the like is configured to be made without using a so-called expensive automatic control, as much as possible simplified structure, and that at a lower cost becomes easy maintenance, it expresses very excellent effect.

DESCRIPTION OF SYMBOLS 10 ... Raw water storage tank 20 ... Water treatment unit 30 ... Sampling measurement mechanism part 40 ... Back pressure valve 50 ... Measuring meter 60 ... Treated water storage tank 100 ... Main line 110 ... Sub line

Claims (4)

A sub-line branched from the main line and communicating with the main line,
The sub-line is formed with a sampling measurement mechanism,
The sampling measurement mechanism section has a back pressure valve and a measurement meter in the downstream direction,
The back pressure valve is in an `` open '' state during operation in which the main line is passing liquid, and the measurement liquid as the processing liquid can pass through the measurement meter disposed on the downstream side,
The back pressure valve is in a “closed” state when the operation is stopped when the main line is not passed through.
Liquid sampling using a back pressure valve, wherein the back pressure valve is configured to measure liquid quality with a measuring meter installed downstream while the back pressure valve is in an “open” state. Measuring system. The back pressure valve is in an “open” state during operation in which the main line is in fluid flow and the operation pressure exceeds the back pressure valve operation setting pressure, and the measurement liquid disposed on the downstream side is treated as the processing liquid. It can be passed,
The back pressure valve is in a “closed” state when the operation is stopped when the main line is not passed or during operation at a pressure lower than the set operating pressure of the back pressure valve,
The liquid using the back pressure valve according to claim 1, wherein the liquid quality is measured by a measuring meter installed on the downstream side during the operation in which the back pressure valve is in an "open" state. Sampling measurement system. In the liquid sampling measurement system using the back pressure valve according to claim 1 or 2,
A liquid processing unit for adjusting the quality of the supplied stock solution, a processing liquid storage tank for storing the processed processing liquid, and the liquid processing unit and the processing liquid storage tank are connected to each other. A main line and a sub line branched from the main line and communicating with the main line,
The sub-line is formed with a sampling measurement mechanism,
The sampling measurement mechanism unit sequentially has a back pressure valve and a measurement meter toward the downstream side,
The back pressure valve is in an “open” state during the operation in which the processing liquid is sent from the liquid processing unit to the processing liquid storage tank and exceeds the operation setting pressure of the back pressure valve. The treatment liquid can pass through,
The back pressure valve is in a “closed” state when the operation is stopped when the supply of the processing liquid from the liquid processing unit to the processing liquid storage tank is stopped or during the operation at a pressure lower than the set operating pressure of the back pressure valve. And
A liquid sampling measurement system using a back pressure valve configured to perform liquid quality measurement with a measurement meter installed on the downstream side during operation in which the back pressure valve is in an “open” state.   The sampling measurement system according to claim 1, wherein the measurement meter is a pH measurement meter.

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