JP2013194949A - Chemical infusing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chemicals infusing apparatus that improves a work environment for workers in the operation test of a chemical infusing pump.SOLUTION: A chemicals infusing apparatus 1 includes a chemicals tank 10 which contains chemicals; a chemical infusion line 20 injecting the chemicals in the chemicals tank 10 to a supply line 100; a chemicals infusing pump 30 provided to the chemicals infusion line 20; a chemicals discharge line 40; a chemicals discharge valve 42; a safety valve 52; a flow rate measurement line 60 which is connected to the downstream side of the chemicals infusing pump 30 in the chemicals infusion line 20, and into which part of a fluid flowing in the chemicals infusion line 20 flows in to measure the flow rate of the chemicals infusion line 20; a flow rate measurement valve 62 which opens and closes the flow rate measurement line 60; a cleaning water supply line 70 which is connected to the chemicals infusion line 20 upstream from the chemicals infusing pump 30, and supplies cleaning water for cleaning the chemicals infusing pump 30; a cleaning water supply valve 72 which opens and closes the cleaning water supply line, and an inlet valve 24 which opens and closes the chemicals infusion line 20 upstream from the connection place of the cleaning water supply line 70.

Description

  The present invention relates to a chemical liquid injector that injects chemicals such as dilute hydrazine and ammonia into a water supply line of a boiler of a power plant.

  Conventionally, in a power generation facility, in order to prevent troubles caused by corrosive water or the like, chemical treatment is injected into a water supply system of a boiler to perform water treatment.

  Conventionally, as this type of technology, there is an apparatus described in Patent Document 1. Patent Document 1 discloses an apparatus for injecting a diluted hydrazine solution into a system including a steam converter and a system including a condensate demineralization facility, and injecting a concentrated hydrazine solution into a system including an auxiliary feed water pump.

  A chemical liquid injection device for injecting chemical liquid into a boiler water supply line is a chemical liquid tank that stores chemical liquid, a chemical injection line that consists of piping connecting the chemical liquid tank and the boiler water supply system, and chemical liquid in the chemical liquid tank. It has a chemical injection pump that feeds it to the boiler water supply system. In addition, a chemical discharge line that discharges the chemical solution in the chemical tank is connected to the downstream side of the chemical injection pump. This chemical discharge line bypasses the chemical discharge valve that opens and closes the chemical discharge line and the chemical discharge valve. A bypass line is provided. In addition, the bypass line is provided with a safety valve that opens and closes when the pressure of the chemical liquid discharge line rises above a certain level and releases the chemical liquid upstream of the chemical liquid discharge valve in the chemical liquid discharge line to the downstream side of the chemical liquid discharge valve. It has been. When the safety valve is opened, the chemical solution is blown to a predetermined facility through the bypass line.

  By the way, the chemical solution injection pump is periodically disassembled and inspected. In addition, after the inspection, a trial run is performed to detect the flow rate of the chemical solution per unit time and evaluate the performance of the chemical injection pump. However, the chemical injection line and the chemical solution discharge line do not have a place for blowing the chemical solution to the outside. Therefore, since the safety valve can be replaced, when performing a test run, replace the safety valve with a test safety valve that has a function of blowing the chemical solution to the outside, and measure the flow rate by measuring the amount of chemical solution blown from the test run safety valve. And evaluated the performance of the drug injection pump.

JP 2002-372205 A

  However, conventionally, when a safety valve is replaced with a safety valve for trial operation in order to perform a trial operation of a chemical injection pump, the chemical liquid may leak from the safety valve and an operator may touch the chemical liquid.

  Further, conventionally, since there is no facility for cleaning the chemical injection pump, there is a possibility that the chemical liquid remaining in the chemical injection pump flows down to the outside when the chemical injection pump is disassembled. Furthermore, in the past, since the flow rate was measured using a chemical solution in the flow measurement at the time of the trial run of the chemical injection pump, if there is a problem with the performance of the chemical injection pump as a result of the trial run, Note The work to remove the pump will be performed. At that time, the work is performed while paying attention to the chemical solution remaining in the chemical injection pump. Thus, the advent of a technique for further improving the working environment of workers during the trial operation of the chemical injection pump is desired.

  An object of this invention is to provide the chemical | medical solution injection | pouring apparatus which solved such a problem and implement | achieved improving the working environment of the worker at the time of trial operation of a chemical injection pump.

  In order to achieve the above object, the present invention has the following configuration.

  (1) A chemical solution tank for storing a chemical solution to be injected into the water supply line of the boiler, a chemical injection line for injecting the chemical solution in the chemical solution tank into the water supply line, and the chemical solution in the chemical solution tank provided in the chemical injection line. A chemical injection pump for feeding to the water supply line; a chemical discharge line connected to the downstream side of the chemical injection pump for discharging the chemical liquid in the chemical liquid tank; a chemical discharge valve for opening and closing the chemical discharge line; and the chemical discharge A safety valve that opens and closes when the line pressure rises above a certain level, and releases the chemical liquid upstream of the chemical liquid discharge valve in the chemical liquid discharge line to the downstream side of the chemical liquid discharge valve; and the drug in the chemical injection line A flow rate measurement line connected to the downstream side of the injection pump and for allowing a part of fluid to flow through the injection line to measure the flow rate in the injection line, and the flow rate A flow rate measuring valve for opening and closing a constant line, a wash water supply line connected to an upstream side of the chemical injection pump in the chemical injection line, for supplying cleaning water for cleaning the chemical injection pump, and the cleaning water supply line A chemical injection device comprising: a cleaning water supply valve that opens and closes; and an inlet valve that is provided upstream of a connection portion of the cleaning water supply line in the chemical injection line and opens and closes the chemical injection line.

  According to (1), when disassembling the chemical injection pump, the chemical injection pump is closed by closing the chemical injection valve, opening the cleaning water supply valve, and flowing the cleaning water from the cleaning water supply line to the chemical injection pump. Can be cleaned. For this reason, it becomes possible to disassemble the chemical pump after cleaning the chemical in the chemical pump. Moreover, when performing a trial run of the chemical injection pump, after opening the flow rate measuring valve, the washing water is poured into the chemical injection line and the trial operation of the chemical injection pump is started. This makes it possible to evaluate the performance of the chemical injection pump by measuring the flow rate of the cleaning water in the chemical injection line, eliminating the need to use chemicals for measuring the flow rate as in the past, and providing a safety valve. No need to replace the safety valve for trial operation. In this way, it is possible to reduce the direct contact of the chemical solution with the worker when the chemical pump is disassembled and inspected, and the working environment of the worker during the trial operation of the chemical pump can be significantly improved.

  (2) In (1), the flow rate measurement line is connected immediately before the water supply line in the chemical injection line.

  According to (2), it becomes possible to measure the flow rate close to the flow rate of the chemical solution sent to the water supply line.

  (3) In (1) or (2), the chemical injection pump is a volumetric pump.

  According to (3), since the chemical injection pump is a volumetric pump and there is almost no difference between the volume of the chemical solution and the volume of the washing water, the performance evaluation of the chemical injection pump can be accurately performed even if the washing water is used for the flow rate measurement. It becomes possible to do. In addition, since the contact of the worker with the chemical is reduced, work safety is improved.

  (4) In (1) to (3), the chemical injection tank stores a dilute hydrazine solution or an ammonia solution as a chemical solution.

  According to (4), it becomes possible to perform the water treatment in the water supply line.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the chemical | medical solution injection | pouring apparatus which implement | achieved improving the working environment of the worker at the time of trial operation of a chemical injection pump.

It is explanatory drawing which shows the structure of the chemical injection device 1 in one Embodiment of this invention. It is explanatory drawing which shows the opening-and-closing state of each valve at the time of trial operation.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory diagram showing a configuration of a chemical liquid injector 1 according to an embodiment of the present invention. The chemical solution injection device 1 is a device that injects a chemical solution into a boiler water supply line 100, and includes a chemical solution tank 10, a chemical injection line 20, a tank original valve 22, a strainer 23, an inlet valve 24, and a chemical injection valve 26. The test valve 28, the chemical injection pump 30, the chemical solution discharge line 40, the chemical solution discharge valve 42, the bypass line 50, the safety valve 52, the flow rate measurement line 60, the flow rate measurement valve 62, and the wash water supply line 70. A washing water supply valve 72, a pressure measurement line 80, a pressure gauge main valve 82, and a pressure gauge 84. Specific examples of the injection point into the water supply line 100 include a condensate pump outlet.

  The chemical liquid tank 10 is a tank for storing a chemical liquid to be injected into the boiler water supply line 100. A dilute hydrazine solution or an ammonia solution is applicable as the chemical solution. In the present embodiment, a dilute hydrazine solution is stored in the chemical tank 10.

  The medicinal injection line 20 is a pipe that is connected to the chemical liquid tank 10 and the water supply line 100 and injects a diluted hydrazine solution into the water supply line 100. In the chemical injection line 20, a tank main valve 22, a strainer 23, an inlet valve 24, a chemical injection valve 26, and a test valve 28 are provided in the order described above from the chemical liquid tank 10 side toward the water supply line 100 side.

  The tank main valve 22, the inlet valve 24, the chemical injection valve 26, and the test valve 28 are valves that open and close the chemical injection line 20, and the strainer 23 is a net-like instrument that removes solid components from the diluted hydrazine solution.

  The chemical injection pump 30 is a positive displacement pump that is provided downstream of the inlet valve 24 and upstream of the chemical injection valve 26 in the chemical injection line 20, and sends the dilute hydrazine solution in the chemical liquid tank 10 to the water supply line 100. Here, the volume pump is a pump that sends out a fluid by a volume change caused by a reciprocating motion of a diaphragm or a piston.

  The chemical liquid discharge line 40 is connected to the downstream side of the chemical injection pump 30 in the chemical injection line 20 and upstream of the chemical injection valve 26, and is a pipe for discharging the dilute hydrazine solution in the chemical injection pump 30 to a predetermined facility. . The chemical solution discharge valve 42 is a valve that is provided in the chemical solution discharge line 40 and opens and closes the chemical solution discharge line 40.

  The bypass line 50 is a pipe that bypasses the chemical solution discharge valve 42 in the chemical solution discharge line 40. The safety valve 52 is an automatic valve that is provided in the bypass line 50 and opens when the pressure in the chemical liquid discharge line 40 exceeds a certain level.

  The flow rate measurement line 60 is connected to the downstream side of the chemical injection valve 26 in the chemical injection line 20 and upstream of the test valve 28, and passes through the chemical injection line 20 in order to measure the flow rate of the fluid flowing through the chemical injection line 20. This is a pipe through which a part of the fluid flows. Here, the connection location of the flow rate measurement line 60 in the medicinal injection line 20 is set immediately before the water supply line 100. The flow rate measurement valve 62 is a valve that is provided in the flow rate measurement line 60 and adjusts the amount of fluid flowing downstream by opening and closing the flow rate measurement line 60.

  The washing water supply line 70 is a pipe that is connected downstream of the inlet valve 24 in the chemical injection line 20 and upstream of the chemical injection pump 30 and supplies cleaning water to the chemical injection pump 30. The cleaning water supply valve 72 is a valve that is provided in the cleaning water supply line 70 and opens and closes the cleaning water supply line 70.

  The pressure measurement line 80 is connected to the upstream side of the connection portion on the inlet side of the bypass line 50 in the chemical liquid discharge line 40. The pressure gauge main valve 82 is a valve that is provided in the pressure measurement line 80 and opens and closes the pressure measurement line 80. The pressure gauge 84 is an instrument that is provided in the pressure measurement line 80 and measures the pressure in the pressure measurement line 80.

  FIG. 1 shows the open / close state of each valve when a dilute hydrazine solution is injected into the water supply line 100, and the closed valve is shown in black. That is, the tank main valve 22, the inlet valve 24, the chemical injection valve 26, the test valve 28, and the pressure gauge main valve 82 are opened, and the chemical liquid discharge valve 42, the flow rate measuring valve 62, and the washing water supply valve 72 are closed. Thereby, the diluted hydrazine solution in the chemical liquid tank 10 is injected into the water supply line 100 through the chemical injection line 20. The pressure gauge 84 measures the pressure in the pressure measurement line 80 and displays the pressure value. Moreover, when the pressure in the chemical injection line 20 increases, the pressure of the chemical discharge line 40 increases, and the safety valve 52 opens when the pressure of the chemical discharge line 40 exceeds a certain level. Thereby, the diluted hydrazine solution in the chemical liquid discharge line 40 is blown through the bypass line 50. Thereby, it is prevented that the pressure in the medicine injection line 20 becomes higher than a certain level. The safety valve 52 is automatically closed when the pressure in the chemical liquid discharge line 40 falls below a certain level.

  Next, the work at the time of periodic inspection will be described. In the periodic inspection, first, an operation of discharging the dilute hydrazine solution in the chemical injection pump 30 is performed.

  When each valve is in the state shown in FIG. 1, first, the inlet valve 24 is closed to stop the supply of the diluted hydrazine solution in the chemical liquid tank 10. Next, the chemical injection pump 30 is driven for a predetermined time with the chemical liquid discharge valve 42 opened. Thereby, the dilute hydrazine solution in the chemical injection pump 30 is blown through the chemical liquid discharge line 40.

  Next, an operation for cleaning the chemical injection pump 30 is performed. First, the medicine injection valve 26 is closed, the washing water supply valve 72 is opened, and washing water is supplied to the medicine injection pump 30. Then, by driving the medicinal pump 30 for a predetermined time, the medicinal pump 30 is washed by the washing water passing through the medicinal pump 30. Wash water that has passed through the chemical injection pump 30 is blown through the chemical liquid discharge line 40.

  Next, the washing water supply valve 72 is closed and the chemical injection pump 30 is stopped. Then, the chemical injection pump 30 is detached from the chemical injection line 20 and the chemical injection pump 30 is disassembled and inspected. After completion of the overhaul, the assembled chemical injection pump 30 or a new chemical injection pump 30 is attached to the chemical injection line 20 and then a test operation is performed to evaluate the performance of the chemical injection pump 30.

  FIG. 2 is an explanatory view showing the open / closed state of each valve during the test operation. The worker opens the chemical injection valve 26, the flow rate measuring valve 62, and the pressure gauge main valve 82, the inlet valve 24, the test valve 28, The chemical solution discharge valve 42 is closed. In addition, a container 90 with a memory for receiving the fluid flowing out from the flow measurement line 60 is placed at the end of the flow measurement line 60.

  The worker then drives the chemical injection pump 30 to open the cleaning water supply valve 72 and supply cleaning water to the chemical injection pump 30. Thereby, washing water flows into the medicinal injection line 20, and a part of the washing water of the medicinal injection line 20 flows out from the flow rate measuring line 60 to the container 90 with memory. Further, the washing water of the other chemical injection line 20 is blown from the chemical liquid discharge line 40 through the bypass line 50. Thereby, the pressure in the medicine injection line 20 is kept constant.

  And an operator measures the amount of washing water in container 90 for every hour, and evaluates the performance of chemical injection pump 30 by calculating the flow rate per unit time. When it is determined that the medicinal pump 30 is operating normally, after washing water in the medicinal pump 30 is blown, each valve is switched as shown in FIG. 1 to dilute hydrazine to the water supply line 100. Resume the solution injection. If it is determined that the medicinal pump 30 is not operating normally, it may be overhauled or replaced with a new medicinal pump 30, and then a test run is performed again to evaluate the performance of the medicinal pump 30. Do. At this time, since the chemical solution is not attached to the chemical injection pump 30, it is possible to perform the removal work safely.

  As described above, according to the present embodiment, it is possible to significantly reduce the chance that the worker touches the dilute hydrazine solution at the time of overhauling or trial operation.

  According to the present embodiment configured as described above, at the time of overhauling the chemical injection pump 30, the inlet valve 24 and the chemical injection valve 26 are closed, the cleaning water supply valve 72 is opened, and the cleaning water supply line is opened. By flowing the washing water from 70 to the chemical injection pump 30, the chemical injection pump 30 can be cleaned. For this reason, after washing | cleaning the chemical | medical solution in the chemical injection pump 30, it becomes possible to disassemble the chemical injection pump 30. FIG. In addition, when performing the trial operation of the medicinal pump, after opening the flow rate measuring valve 62, the washing water supply valve 72 is opened to allow the washing water to flow into the medicinal injection line 20 and the trial operation of the medicinal pump 30 is started. Thereby, it becomes possible to evaluate the performance of the medicinal pump 30 by measuring the flow rate of the washing water of the medicinal injection line 20, and it becomes unnecessary to use medicinal solution for the flow rate measurement as in the prior art. There is no need to replace the safety valve 52 with a safety valve for trial operation. In this way, it is possible to reduce the direct contact of the chemical solution with the worker when the chemical pump is disassembled and inspected, and the working environment of the worker during the trial operation of the chemical pump can be significantly improved.

  In addition, according to the present embodiment, the flow rate measurement line 60 is connected immediately before the water supply line 100 in the chemical injection line 20, thereby measuring a flow rate close to the flow rate of the chemical liquid injected into the water supply line 100. Is possible.

  Further, according to the present embodiment, the medicinal pump 30 is composed of a volumetric pump, and there is almost no difference between the volume of the medicinal solution and the volume of the washing water. It becomes possible to perform performance evaluation accurately. In addition, since the contact of the worker with the chemical is reduced, work safety is improved.

  As mentioned above, although embodiment of this invention was described, embodiment of this invention is not restricted to embodiment mentioned above. For example, according to the above-described embodiment, the dilute hydrazine solution is applied as the chemical solution. However, the solution is not limited thereto. For example, an ammonia solution may be used as long as the chemical solution is used for water treatment of the water supply line 100. Applicable.

DESCRIPTION OF SYMBOLS 1 Chemical liquid injection device 10 Chemical liquid tank 20 Chemical injection line 22 Tank main valve 23 Strainer 24 Inlet valve 26 Chemical injection valve 28 Test valve 30 Chemical injection pump 40 Chemical liquid discharge line 42 Chemical liquid discharge valve 50 Bypass line 52 Safety valve 60 Flow measurement line 62 Flow rate Measuring valve 70 Washing water supply line 72 Washing water supply valve 80 Pressure measurement line 82 Pressure gauge main valve 84 Pressure gauge 90 Container 100 Water supply line

Claims (4)

A chemical tank for storing chemicals to be injected into the boiler water supply line;
A chemical injection line for injecting chemical liquid from the chemical liquid tank into the water supply line;
A chemical injection pump provided in the chemical injection line, for sending the chemical liquid in the chemical liquid tank to the water supply line;
A chemical solution discharge line connected to the downstream side of the chemical injection pump and discharging the chemical solution in the chemical solution tank;
A chemical discharge valve for opening and closing the chemical discharge line;
A safety valve that opens and closes when the pressure of the chemical liquid discharge line rises above a certain level, and releases the chemical liquid upstream of the chemical liquid discharge valve in the chemical liquid discharge line to the downstream side of the chemical liquid discharge valve;
A flow rate measuring line connected to the downstream side of the medicinal pump in the medicinal line and allowing a portion of fluid to flow through the medicinal line to measure the flow rate in the medicinal line;
A flow measurement valve for opening and closing the flow measurement line;
A cleaning water supply line connected to the upstream side of the chemical injection pump in the chemical injection line and supplying cleaning water for cleaning the chemical injection pump;
A cleaning water supply valve for opening and closing the cleaning water supply line;
An inlet valve provided on the upstream side of the connecting portion of the cleaning water supply line in the chemical injection line, and opens and closes the chemical injection line;
A chemical injection device characterized by comprising:   The chemical flow injection device according to claim 1, wherein the flow rate measurement line is connected immediately before the water supply line in the chemical injection line.   The chemical injection device according to claim 1 or 2, wherein the chemical injection pump is a volumetric pump. The chemical solution injection device according to any one of claims 1 to 3, wherein the chemical solution tank stores a diluted hydrazine solution or an ammonia solution as a chemical solution.

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