JP4080849B2 - Boiler management method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a boiler management method used in a thermal power plant. In particular, the present invention relates to a boiler management method during boiler storage (for example, when a thermal power plant is stopped for a long period of time) or when a boiler is restored (for example, when a thermal power plant that has been stopped for a long period of time is operated).
[0002]
[Prior art]
A thermal power plant is known as a thermal power plant. A schematic diagram of an example of a thermal power plant is shown in FIG.
In the thermal power plant shown in FIG. 1, a turbine 20 (for example, a steam turbine) and a generator 30 are connected by a rotating shaft. The turbine 20 includes a high pressure turbine 21, an intermediate pressure turbine 22, and a low pressure turbine 23. A condensate system for recirculating steam is also provided. A schematic diagram of the condensate system is shown in FIG.
The thermal power plant shown in FIG. 1 operates as follows.
The boiler 17 supplies steam generated by heating water to the high-pressure turbine 21. The steam discharged from the high-pressure turbine 21 is reheated by the boiler 17 and then supplied to the intermediate-pressure turbine 22. The steam discharged from the intermediate pressure turbine 22 is supplied to the low pressure turbine 23.
The steam discharged from the low pressure turbine 23 is supplied to the condenser 11. The condenser 11 cools the steam discharged from the low-pressure turbine 23 with a cooling medium to generate water, and returns the generated water to the boiler 17.
The generator 30 is driven by the turbine 20 to generate electric power, and supplies the generated electric power to an electric power system or the like.
By the way, in a thermal power plant having a condensing system for returning steam discharged from a turbine to a boiler via a condenser, the boiler 17 is dissolved by oxygen (dissolved oxygen) dissolved in water injected into the condenser. There is a possibility that corrosion or the like may occur in an inner wall portion of a pipe or the like provided between the condenser 11 and the boiler 17. For this reason, the condensate system is provided with a dissolved oxygen removing device for removing dissolved oxygen. For example, as shown in FIG. 2, the condensate system is provided with a low-pressure feed water heater 13, a deaerator 14, and a high-pressure feed water heater 16 as a dissolved oxygen removing device.
Furthermore, in order to remove the dissolved oxygen that cannot be removed by the dissolved oxygen removing apparatus, a chemical solution in which a chemical for removing oxygen (deoxygenating agent) is added to water is used. As the oxygen scavenger, for example, hydrazine is used. During operation of the thermal power plant, since the steam circulates, the concentration of the drug solution is set low (low concentration drug solution).
In the condensate system, the condensate pump 12 that supplies the chemical solution from the condenser 11 to the deaerator, the feed water pump 15 that supplies the chemical solution from the deaerator 14 to the boiler, and the chemical solution in the boiler 17 are supplied. A circulation pump 18 for circulation is provided.
In the following, piping between the condenser 11 and the deaerator 14 (including the condensing pump 12 and the low-pressure feed water heater 13) is referred to as “condensation piping”, and piping between the deaerator 14 and the boiler 17 ( The water supply pump 15, the high-pressure water heater 16, etc.) are called “water supply pipes”.
[0003]
When shutting down a thermal power plant with such a condensate system for a long period of time (when storing boilers), it is possible to prevent the boiler and piping of the condensate system from corroding while the thermal power plant is stopped (while the boiler is stopped). In order to do this, each part of the condensate system (boiler, deaerator, pipes, etc.) should have a drug solution (high concentration drug solution) with a concentration higher than the concentration of the drug solution (low concentration drug solution) during operation of the thermal power plant It is necessary to accumulate. Furthermore, it is necessary to make the concentration of the high concentration drug solution uniform.
In the conventional boiler management method during boiler storage, first, the low-concentration chemical solution remaining in the boiler, water supply pipe, deaerator, condensate pipe, etc. of the condensate system is drained, and then A chemical solution (high-concentration chemical solution) whose concentration is uniformly adjusted to a predetermined concentration is generated by a condenser, and the generated high-concentration chemical solution is supplied from the condenser to a condenser pipe, a deaerator, a water supply pipe, and a boiler. The method of supplying and storing in etc. is used.
Also, when starting a thermal power plan having such a condensate system from a state where it has been stopped for a long time (when the boiler is restored), a chemical solution (high concentration) stored in each part of the condensate system It is necessary to set the concentration of the drug solution to a concentration (low concentration) suitable for the operation of the thermal power plant (operation of the boiler).
In the conventional boiler management method at the time of boiler recovery, first, the high-concentration chemical solution remaining in the boiler, water supply pipe, deaerator, condensate pipe, etc. provided in the condensate system is drained. After that, a drug solution (low concentration drug solution) whose concentration is uniformly adjusted to a low concentration is generated by a condenser, and the generated low concentration drug solution is supplied from a condenser to a condenser pipe, a deaerator, and water supply. It is used to supply and collect in pipes and boilers.
Patent Documents 1 and 2 disclose a technique for making the concentration of the drug solution in the condensate system uniform during boiler storage.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 62-196506
[Patent Document 2]
JP 62-233606 A
[0005]
[Problems to be solved by the invention]
As described above, the conventional boiler management method at the time of boiler storage or at the time of boiler recovery is that the chemical solution remaining in the boiler, water supply pipe, deaerator and condensate pipe of the condensate system is removed. After draining, a method is used in which a high-concentration chemical solution or a low-concentration chemical solution is stored in a condenser, condenser pipe, deaerator, water supply pipe, boiler, or the like of a condensate system.
Here, the boiler and deaerator of the condensate system have a large capacity, but the structure is simple, and the drainage valves provided in the boiler and deaerator are large in capacity and a small number. The amount of work when draining the chemical solution in the air vessel is small, and the drainage time is also short. On the other hand, the piping of the condensate system (water supply piping, condensate piping) has a small capacity (low flow rate per unit time) and a complicated piping system, and the drain valve provided in the piping is Since the number is small and the number is large, the amount of work (the number of drain valves to be operated) when draining the chemical solution in the pipe is large, and the drainage time is also long.
For this reason, in the conventional boiler management method, a large amount of work is required when the boiler is stored or when the boiler is restored, and a long work time is required until the work is completed.
Therefore, an object of the present invention is to provide a boiler management method that can reduce the amount of work during boiler storage or boiler recovery, and can reduce work time.
[0006]
[Means for Solving the Problems]
A first invention of the present invention for solving the above problem is a boiler management method as described in claim 1.
In the boiler management method according to claim 1, the condensate is stored in a state in which a chemical solution (for example, a low-concentration chemical solution) remains in the condenser, the condensate piping, and the deaerator when the boiler is stored. A circulation path including a condenser, a condensate pipe and a deaerator is formed to generate a drug solution of a predetermined concentration (for example, a high concentration drug solution), and the generated drug solution of the predetermined concentration is supplied from the deaerator to the boiler After that, the chemical | medical agent is inject | poured in a boiler and the density | concentration of the chemical | medical agent solution in a boiler is adjusted (for example, it adjusts to high concentration). In the present invention, since the work of draining the chemical solution remaining in the condensate pipe and the deaerator is unnecessary, the work amount can be reduced and the work time can be shortened. Furthermore, since a chemical solution (for example, a low concentration drug solution) remaining in the condenser pipe and the deaerator can be used, a drug solution having a predetermined concentration (for example, a high concentration drug solution) is generated. The amount of water and chemicals used can be reduced. Thereby, the cost at the time of boiler storage can be reduced.
The second invention of the present invention is a boiler management method as described in claim 2.
The boiler management method according to claim 2, wherein a chemical solution (for example, a low-concentration chemical solution) remains in the condensate pipe, the deaerator, the feed water pipe, and the boiler with a predetermined concentration by a circulation path. A drug solution (for example, a high concentration drug solution). In this invention, since the operation | work which drains the chemical | medical solution which remain | survives in a boiler and piping for water supply is also unnecessary, while being able to reduce work amount more, working time can be shortened more. Here, if supply of the chemical solution of a predetermined concentration in the deaerator to the boiler is performed using, for example, a water supply pump, the chemical solution remaining in the water supply pipe (for example, a low concentration chemical solution) is removed. It can be quickly replaced with a drug solution of a predetermined concentration (for example, a high concentration drug solution), and the working time can be further shortened. Furthermore, since the chemical solution (for example, low concentration chemical solution) remaining in the boiler and the water supply pipe can be used, when the chemical solution of a predetermined concentration (for example, high concentration chemical solution) is stored in the boiler. The amount of water and chemicals used can be reduced, and the cost for boiler storage can be further reduced.
A third aspect of the present invention is a boiler management method according to the third aspect.
The boiler management method according to claim 3, wherein a drug solution (for example, a low concentration drug solution) remaining in the boiler is supplied before supplying a drug solution (for example, a high concentration drug solution) having a predetermined concentration to the boiler. Drain a part of it. The concentration of the drug solution during boiler storage is very high compared to the concentration of the drug solution during boiler operation. Moreover, when supplying the chemical solution of a predetermined density | concentration to a boiler, the chemical | medical solution exceeding the liquid level in a boiler is drained, for example. For this reason, by draining a part of the low concentration drug solution remaining in the boiler in advance, a predetermined concentration of the drug solution (for example, a high concentration drug solution) is supplied to the boiler. The drug solution can be used effectively, and the amount of the drug necessary for adjusting the concentration of the drug solution in the boiler can be reduced.
The fourth aspect of the present invention is a boiler management method as set forth in claim 4.
In the boiler management method according to the fourth aspect, the step of generating a drug solution having a predetermined concentration by the circulation path and the step of draining a part of the drug solution remaining in the boiler are performed in parallel. Thereby, the working time at the time of boiler storage can be further shortened.
A fifth aspect of the present invention is a boiler management method as set forth in the fifth aspect.
In the boiler management method according to claim 5, before supplying a chemical solution of a predetermined concentration (for example, high concentration chemical solution) to the boiler, one of the chemical solutions (for example, low concentration chemical solution) in the water supply pipe is supplied. Drain the part. As a result, the concentration of the drug solution of a predetermined concentration (for example, high concentration drug solution) supplied into the water supply pipe is lowered by the drug solution (for example, low concentration drug solution) remaining in the water supply pipe. Therefore, it is possible to reliably store a chemical solution having a predetermined concentration in the water supply pipe.
A sixth aspect of the present invention is a boiler management method as set forth in the sixth aspect.
The boiler management method according to claim 6, wherein the concentration of the drug solution in the condenser is at least in a state where a drug solution (for example, a high concentration drug solution) remains in the condensate pipe and the water supply pipe. Is adjusted (for example, adjusted to a low concentration), and then the condensate is discharged with the chemical solution initially supplied to the deaerator being drained from the remaining chemical solution. The chemical solution is supplied and stored from the vessel, and then the chemical solution supplied to the boiler is supplied from the deaerator to the boiler that drains the remaining chemical solution. To do. In the present invention, the chemical solution (for example, high concentration chemical solution) remaining in the condensate pipe or the feed water pipe is supplied from the condenser to the deaerator or supplied from the deaerator to the boiler. It pushes out to a deaerator or a boiler with the chemical | medical agent solution (for example, low concentration chemical | medical solution), and drains from the large capacity | capacitance drain valve provided in the deaerator or a boiler. Thereby, since it is not necessary to drain the chemical solution remaining in the condensate pipe and the water supply pipe when the boiler is restored, the work amount can be reduced and the work time can be shortened.
A seventh aspect of the present invention is a boiler management method as set forth in the seventh aspect.
In the boiler management method according to the seventh aspect, the step of adjusting the concentration of the drug solution in the condenser and the step of draining the drug solution remaining in the deaerator are performed in parallel. Thereby, the work time at the time of boiler recovery can be shortened more.
An eighth aspect of the present invention is a boiler management method as set forth in the eighth aspect.
In the boiler management method according to the eighth aspect, the step of adjusting the concentration of the chemical solution in the condenser and the step of draining the chemical solution remaining in the deaerator and the boiler are performed in parallel. Thereby, the work time at the time of boiler recovery can be further shortened.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the following description, a case will be described in which the present invention is applied to a thermal power plant having the condensate system shown in FIG. 2 and having a schematic configuration diagram shown in FIG.
First, a boiler management method during boiler storage will be described.
[0008]
A conventional boiler management method during boiler storage will be described with reference to FIGS.
For example, when the thermal power plant is stopped for a long period of time (when the boiler is stored), first, the chemical solution (low concentration chemical solution) remaining in the condensate system is drained. For example, as shown in FIG. 6, a drain valve provided in the deaerator 14 and the boiler 17, a condensate pipe provided between the condenser 11 and the deaerator 14 (condensate pump 12, low pressure (Including feed water heater 13), and open a drain valve provided in a feed water pipe (including feed water pump 15 and high pressure feed water heater 16) provided between deaerator 14 and boiler 17 (open control) Then, the low concentration chemical solution remaining in the deaerator 14, the boiler 17, the condensate pipe, and the water supply pipe is drained. In the condenser 11, a low-concentration drug solution is left in order to produce a drug solution with an adjusted concentration.
Next, as shown in FIG. 7, a circulation path including the condenser 11, the condensate pump 12 and the circulation pipeline is formed, and the circulation pump 12 is operated to circulate the chemical solution in the condenser 11. . At this time, the concentration of the drug solution in the condenser 11 is adjusted to a concentration (high concentration) suitable for boiler storage by injecting the drug (corrosion inhibitor) and water into the condenser 11.
Next, as shown in FIG. 8, the condensate pump 12 is operated, and the high concentration chemical solution in the condenser 11 is supplied to the deaerator 14 through the condensate pipe.
Next, as shown in FIG. 9, the water supply pump 15 is operated to supply the high concentration chemical solution in the deaerator 14 to the boiler 17 through the water supply pipe.
[0009]
Here, since the high-concentration chemical solution produced by the condenser 11 is also supplied to the condensate pipe, the deaerator, and the water supply pipe, the boiler for one batch of the high-concentration chemical solution produced by the condenser 11 is used. 17 does not fill the high concentration drug solution.
For this reason, as shown in FIG. 10, a circulation path including the condenser 11, the condensate pump 12, and the circulation pipe line similar to the circulation path shown in FIG. 7 is formed, and again in the condenser 11. In addition, a drug solution (high concentration drug solution) having a concentration suitable for stopping the pump is generated.
Next, as shown in FIG. 11, the condensate pump 12 is operated, and the high concentration chemical solution in the condenser 11 is supplied to the deaerator 14 through the condensate pipe.
Next, as shown in FIG. 12, the feed water pump 15 is operated, and the high concentration drug solution in the deaerator 14 is filled in the boiler 17 via the water supply pipe, and the high concentration drug solution is filled in the boiler 17. Supply up to.
[0010]
As described above, the conventional boiler management method during boiler storage is to first drain the low-concentration chemical solution remaining in the boiler, water supply pipe, deaerator, and condensate pipe. Do. For this reason, it is necessary to open many drain valves provided in the water supply pipe and the condensate pipe, and the amount of work is large. Furthermore, it takes a long time to drain the chemical solution remaining in the water supply pipe and the condensate pipe.
In addition, since the low concentration drug solution remaining in each part of the condensate system is not used, the amount of water or drug used to produce the high concentration drug solution is large.
Moreover, it is necessary to perform the process of producing a high-concentration drug solution with a condenser several times (for example, twice), which also increases the work time.
[0011]
On the other hand, according to the boiler management method of the present invention at the time of boiler storage, the work amount can be reduced and the work time can be shortened. Furthermore, since the low concentration drug solution in the condensate system is used, the amount of water or drug used to generate the high concentration drug solution can be reduced.
An embodiment of a boiler storage method during boiler storage according to the present invention will be described with reference to FIGS.
When the thermal power plant is stopped for a long period of time, first, the chemical solution (low concentration chemical solution) remains in the boiler 17, the water supply pipe, the deaerator 14, the condensate pipe and the condenser 11. In the state, for example, as shown in FIG. 3, a condenser 11, a condensate pipe (including a condensate pump 12 and a low-pressure feed water heater 13), a deaerator 14, and a circulation path including a circulation pipe are provided. Form.
And the condensate pump 12 is operated and the chemical | medical solution in the condenser 11, the condensate piping, and the deaerator 14 is circulated in a circulation path. At this time, by injecting chemical (corrosion inhibitor) and water into the condenser 11, the concentration of the chemical solution in the circulation path (in the condenser 11, the condenser pipe and the deaerator 14) is stored in the boiler. Adjust to a predetermined density (high density) that is appropriate at times.
It should be noted that the amount of medicine and water injected into the condenser 11 is such that a predetermined amount of medicine solution is accumulated in the deaerator 14 (for example, the level of the liquid level in the deaerator 14 reaches the upper limit level). To adjust). Further, the place where the medicine and water are injected is not limited to the condenser, and may be any place in the circulation path. Various methods can be used to adjust the concentration of the drug solution in the circulation path to a predetermined concentration (high concentration). The concentration of the drug solution in the circulation path is measured, and the measured concentration is predetermined. It is preferable to use a method of adjusting the injection amounts of the drug and water so as to obtain a concentration (high concentration).
[0012]
Next, as shown in FIG. 4, the water supply pump 15 is operated to supply a chemical solution (high concentration chemical solution) in the deaerator 14 to the boiler 17 through the water supply pipe. Thereby, the drug solution (low concentration drug solution) remaining in the water supply pipe is replaced (extruded) by the drug solution (high concentration drug solution) supplied from the deaerator 14.
The amount of the high concentration drug solution supplied from the deaerator 14 to the boiler 17 can be set as appropriate. For example, a method of operating the feed water pump 15 for a predetermined time or a method of supplying the high concentration chemical solution to the boiler 17 until the liquid level in the boiler 17 reaches the upper limit level can be used.
Next, as shown in FIG. 5, the circulation pump 18 provided in the boiler 17 is operated to circulate the chemical solution in the boiler 17. At this time, the chemical | medical agent is inject | poured into the boiler 17, and the density | concentration of the chemical | medical agent solution in the boiler 17 is adjusted to predetermined density | concentration (high concentration). As a method for adjusting the concentration of the drug solution in the boiler 17 to a predetermined concentration, various methods can be used. The concentration of the drug solution in the boiler 17 is measured, and the measured concentration is set to a predetermined concentration (high concentration). It is preferable to use a method of adjusting the injection amount of the drug so that
[0013]
When supplying a high concentration drug solution from the deaerator 14 to the boiler 17, it is necessary to supply a high concentration drug solution in such an amount that at least the low concentration drug solution remaining in the water supply pipe can be replaced with the high concentration drug solution. . In this case, the amount of the chemical solution in the boiler 17 may exceed a predetermined amount (for example, the liquid level exceeds the upper limit level). Usually, when the amount of the drug solution in the boiler 17 exceeds a predetermined amount (for example, when the liquid level exceeds an upper limit level), the boiler 17 is adjusted to discharge the drug solution that exceeds the predetermined amount. A device is provided. For this reason, when supplying the high concentration drug solution from the deaerator 14 to the boiler 17, if the amount of the drug solution in the boiler 17 exceeds a predetermined amount, the drug solution exceeding the predetermined amount is drained to the outside.
Here, the density | concentration (low concentration) of the chemical | medical solution at the time of boiler operation is very low compared with the density | concentration (high concentration) of the chemical | medical solution at the time of boiler storage. For this reason. When supplying the high concentration drug solution from the deaerator 14 to the boiler 17, if the amount of the drug solution in the boiler 17 exceeds the predetermined amount and is drained to the outside, the high concentration drug solution supplied to the boiler 17 is efficiently used. Cannot use well. In this case, for example, in order to adjust the concentration of the drug solution in the boiler 17 to a predetermined concentration (high concentration), the amount of the drug injected into the boiler 17 increases, and the cost increases.
Therefore, before supplying the high concentration drug solution from the deaerator 14 to the boiler 17, it is preferable to drain a part of the low concentration drug solution remaining in the boiler 17 by, for example, a drain valve. The amount of drainage can be adjusted as appropriate. For example, a method of adjusting the opening time of the drain valve or a method of controlling the opening of the drain valve until the level of the liquid level in the boiler reaches a predetermined level can be used.
In addition, it is preferable to perform the process which drains a part of chemical | medical solution in the boiler 17 in parallel with the process which produces | generates a predetermined concentration chemical | medical solution (high concentration chemical | medical solution) by the above-mentioned circulation path. By performing a part of the waste water treatment of the chemical solution in the boiler 17 and the production process of the high concentration chemical solution by the circulation path, the working time can be further shortened.
[0014]
As described above, in the present embodiment, the low-concentration chemical solution remaining in the boiler 17, the water supply pipe, the deaerator 14 and the condensate pipe, in particular, the water supply pipe and the condensate pipe. There is no need to drain the remaining low concentration drug solution. For this reason, the operation | work which operates the drain valve provided in the boiler 17, water supply piping, deaerator 14, and condensate piping, especially the drain valve provided in water supply piping and condensate piping is unnecessary. Thus, the amount of work can be reduced. Accordingly, there is no need to wait until the low-concentration chemical solution remaining in the boiler 17, the water supply pipe, the deaerator 14 and the condensate pipe is drained (removing the drainage time from the work time). Work time can be shortened.
In addition, in order to generate a drug solution (high concentration drug solution) having a predetermined concentration suitable for boiler storage using the low concentration drug solution remaining in the condenser 11, the condensate pipe and the deaerator 14, It is possible to reduce the amount of drug and water required to produce a high concentration drug solution. Therefore, the cost at the time of boiler storage can be reduced.
Further, since the low-concentration drug solution remains in the boiler 17, the amount of the high-concentration drug solution supplied from the deaerator 14 to the boiler 17 may be smaller than that in the conventional example. For this reason, it is necessary to perform the process of generating the high concentration chemical solution by the circulation path including the condenser 11, the condensate pipe and the deaerator 14 only once, and the high concentration sufficient to supply the boiler 17. A drug solution can be produced. This also shortens the work time.
In addition, when the boiler management method at the time of boiler storage according to the present embodiment is used, the working time can be reduced to 1/6 and the amount of drained water can be reduced to 1/5 compared to the conventional example. I was able to reduce it.
[0015]
The boiler management method at the time of boiler storage of the present invention is not limited to the method described in the above embodiment, and various changes, additions, and deletions are possible.
For example, in the state where the low concentration chemical solution remains in the boiler 17, the water supply pipe, the deaerator 14, the condensate pipe and the condenser 11, the condenser 11, the condensate pipe and the deaerator The high-concentration drug solution is generated by the circulation path including 14, but the high-concentration drug solution is generated by the circulation path in a state where the drug solution remains in at least the deaerator 14, the condensate pipe and the condenser. That's fine. In this case, since it is not necessary to drain at least the low-concentration chemical solution remaining in the deaerator 14 and the condensate pipe, the work amount can be reduced and the work time can be shortened. it can.
Further, by supplying the high concentration drug solution from the deaerator 14 to the boiler 17 in a state where the low concentration drug solution remains in the water supply pipe, the low concentration drug solution in the water supply pipe is converted to the high concentration drug solution. However, a method of supplying the high concentration drug solution from the deaerator 14 to the boiler 17 after draining the low concentration drug solution remaining in the water supply pipe may be used. In this case, in order to drain the low-concentration chemical solution remaining in the water supply pipe, it is necessary to operate a drain valve provided in the water supply pipe and the residual water in the water supply pipe. It is necessary to wait until the low-concentration chemical solution is drained, and the work amount increases accordingly, and the work time becomes longer. However, since the high-concentration chemical solution adjusted to a predetermined concentration can be accurately supplied into the water supply pipe, corrosion in the water supply pipe can be reliably prevented during boiler storage. In this case, the process of draining part of the drug solution in the boiler 17 in advance can be omitted, and the high-concentration drug solution can be used efficiently.
Moreover, although the case where it applied to a thermal power plant was demonstrated, the management method of the boiler at the time of boiler storage of this invention can be applied to various thermal power plants other than a thermal power plant.
[0016]
Next, a boiler management method at the time of boiler recovery will be described.
A conventional boiler management method at the time of boiler recovery will be described with reference to FIGS.
When the operation is started from a state where the thermal power plant has been stopped for a long time (when the boiler is restored), first, the chemical solution (high concentration chemical solution) in the condensate system is drained. For example, as shown in FIG. 16, the deaerator 14, the boiler 17, the condensate piping provided between the condenser 11 and the deaerator 14 (including the condensate pump 12 and the low-pressure feed water heater 13). The drain valve provided in the water supply pipe (including the water supply pump 15 and the high-pressure feed water heater 16) provided between the deaerator 14 and the boiler 17 is opened, and the deaerator 14, boiler 17, Drain the high-concentration chemical solution remaining in the water pipe and water supply pipe. In the condenser 11, a high concentration drug solution is left in order to generate a drug solution with an adjusted concentration.
Next, as shown in FIG. 17, the condensate pump 12 is operated with the drain valve provided in the deaerator 14 open, and the high-concentration chemical solution remaining in the condenser 11 is recovered. It supplies to the deaerator 14 through water piping, and drains from the drain valve provided in the deaerator. When the discharge of the chemical solution in the condenser 11 is completed (for example, when the liquid level in the condenser 11 reaches the lower limit level), the operation of the condenser pump 12 is stopped, and then the condenser 11 is turned on. Water is injected to reduce the concentration of the drug solution in the condenser 11. When the injection of water into the condenser 11 is completed (for example, when the liquid level in the condenser reaches the upper limit level), the concentration of the chemical solution in the condenser 11 is measured. When the measured concentration is not lowered to a concentration that does not hinder the operation of the boiler (low concentration), the condensate pump 12 is operated and supplied to the deaerator 14 via the condensate pipe. It drains from the drain valve provided in 14. The above processing is repeated until the measured concentration drops to a concentration that does not hinder boiler operation (low concentration).
[0017]
When the concentration of the chemical solution in the condenser 11 is lowered to a concentration that does not hinder the operation of the boiler (low concentration), the drain valve provided in the deaerator 14 is closed as shown in FIG. And the condensate pump 12 is operated and the low concentration chemical | medical solution in the condenser 11 is supplied to the deaerator 14 via the piping for condensate. At this time, while injecting water into the condenser 11, the low-concentration drug solution in the condenser 11 is supplied to the deaerator 14 until the low-concentration drug solution reaches a predetermined amount in the deaerator 14 ( For example, it is supplied until the liquid level in the deaerator 14 reaches the upper limit level).
Next, as shown in FIG. 19, the water supply pump 15 is operated, and the low concentration chemical | medical solution in the deaerator 14 is supplied to the boiler 17 via piping for water supply.
[0018]
As described above, the conventional boiler management method at the time of boiler recovery first drains the high-concentration chemical solution remaining in the deaerator 14, boiler 17, water supply pipe and condensate pipe. . For this reason, it is necessary to operate the drain valves provided in the deaerator 14, the boiler 17, the water supply pipe and the condensate pipe, in particular, the numerous drain valves provided in the water supply pipe and the condensate pipe. There is a lot of work.
Further, since it takes a long time to drain the high concentration chemical solution remaining in the water supply pipe and the condensate pipe, the working time becomes long.
[0019]
On the other hand, according to the boiler management method at the time of boiler recovery according to the present invention, the work amount can be reduced and the work time can be shortened.
An embodiment of a boiler storage method at the time of boiler recovery according to the present invention will be described with reference to FIGS.
When the operation is started from a state where the thermal power plant has been stopped for a long time (when the boiler is restored), for example, as shown in FIG. 13, the drain valves provided in the deaerator 14 and the boiler 17 are opened. Then, the high concentration chemical solution remaining in the deaerator 14 and the boiler 17 is drained.
Further, a circulation path including the condenser 11, the condensate pump 12 and the circulation pipeline is formed, and the high concentration chemical solution in the condenser 11 is circulated in the circulation path. At this time, by injecting water into the condenser 11, the concentration of the high-concentration drug solution in the circulation path is adjusted to a concentration that does not hinder the operation of the boiler (low concentration). Various methods can be used as a method for adjusting the concentration of the drug solution in the circulation path, but the concentration of the drug solution in the circulation path is measured, and water is measured until the measured concentration reaches a predetermined concentration (low concentration). It is preferable to use a method of injecting.
For example, when the liquid level in the condenser 11 exceeds the upper limit level, the chemical solution exceeding the upper limit level is drained from the condenser 11 by the liquid amount adjusting device.
The waste water treatment of the high concentration drug solution remaining in the deaerator 14 and the boiler 17 and the process of adjusting the concentration of the high concentration drug solution in the condenser 11 to a low concentration are preferably performed in parallel. Thereby, working time is shortened.
[0020]
Next, as shown in FIG. 14, the condensate pump 12 is operated, and the chemical solution (low-concentration chemical solution) in the condenser 11 whose concentration is adjusted is deaerated through the condenser pipe. To supply.
Here, since the high-concentration chemical solution remains in the condensate pipe, when the low-concentration chemical solution in the condenser 11 is supplied to the deaerator 14 through the condensate pipe, the supply starts at the beginning. The high-concentration drug solution remaining in the condensate pipe is pushed out to the deaerator 14 side (the high-concentration drug solution is replaced with the low-concentration drug solution). Therefore, when supplying a low-concentration chemical solution from the condenser 11 to the deaerator 14, the drain valve provided in the deaerator 14 is opened during the beginning of the supply, and the degasser 14 is degassed. The high-concentration drug solution pushed out to the ventilator is drained from a drain valve provided in the deaerator.
The time for controlling the opening of the drain valve provided in the deaerator 14 at the start of the supply of the low-concentration chemical solution from the condenser 11 to the deaerator 14 can be set as appropriate. For example, the method of closing the drain valve when the concentration of the drug solution discharged from the deaerator or the concentration of the drug solution in the condensate pipe falls to the set concentration, or the method of opening the drain valve for a set time, etc. Can be used.
Then, for example, when the concentration of the chemical solution in the condensate pipe is equal to or lower than the set concentration, the drain valve provided in the deaerator 14 is closed. As a result, the low-concentration chemical solution supplied from the condenser 11 to the deaerator 14 is accumulated in the deaerator 14.
The conditions for stopping the supply of the low-concentration drug solution from the condenser 11 to the deaerator 14 can be set as appropriate. For example, a method of stopping the supply of the low-concentration chemical solution when the liquid level in the deaerator 14 reaches the upper limit level, or a predetermined amount of the low-concentration chemical solution is supplied from the condenser 11 to the deaerator 14. For example, a method of stopping the supply of the low-concentration drug solution when a predetermined time has elapsed from the start of the supply or the start of supply can be used.
[0021]
Next, as shown in FIG. 15, the water supply pump 15 is operated to supply the low concentration chemical solution in the deaerator 14 to the boiler 17 through the water supply pipe.
Here, since the high-concentration chemical solution remains in the water supply pipe, when the low-concentration chemical solution in the deaerator 14 is supplied to the boiler 17 through the water supply pipe, the supply is initially performed for water supply. The high-concentration chemical solution remaining in the pipe is pushed out to the boiler 17 side. Therefore, when supplying the low-concentration chemical solution from the deaerator 14 to the boiler 17, the drain valve provided in the boiler 17 was opened during the beginning of supply, and the boiler 17 was pushed out from the water supply pipe to the boiler 17. The high concentration drug solution is drained from a drain valve provided in the boiler 17.
The time for controlling the opening of the drain valve provided in the boiler 17 at the start of the supply of the low-concentration chemical solution from the deaerator 14 to the boiler 17 can be set as appropriate. For example, use a method that closes the drain valve when the concentration of the chemical solution discharged from the boiler or the concentration of the chemical solution in the water supply pipe drops to the set concentration, or a method that controls the drain valve to open for a set time. Can do.
For example, when the concentration of the chemical solution in the water supply pipe is equal to or lower than the set concentration, the drain valve provided in the boiler 17 is closed. As a result, the low-concentration drug solution supplied from the deaerator 14 to the boiler 17 is accumulated in the boiler 17.
The conditions for stopping the supply of the low-concentration drug solution from the deaerator 14 to the boiler 17 can be set as appropriate. For example, a method of stopping the supply of the low-concentration drug solution when the liquid level in the boiler 17 reaches the upper limit level, or a time point or supply when a predetermined amount of the low-concentration drug solution is supplied from the deaerator 14 to the boiler 17. A method of stopping the supply of the low-concentration drug solution when a predetermined time has elapsed from the start can be used.
At this time, it is preferable to operate the circulation pump 18 to circulate the drug solution in the boiler 17 to uniformly adjust the concentration of the drug solution in the boiler 17.
[0022]
As described above, in the present embodiment, it is not necessary to drain the high concentration chemical solution remaining in the water supply pipe and the condensate pipe. For this reason, the operation | work which operates the drain valve provided in the piping for water supply and the piping for condensate becomes unnecessary, and the amount of work can be reduced. As a result, there is no need to wait until the high-concentration chemical solution remaining in the water supply pipe and condensate pipe is drained (the drainage time can be deleted from the work time). It can be shortened.
In addition, when the boiler management method at the time of boiler recovery of this Embodiment was used, compared with the prior art example, the work time was able to be shortened to 1/2.
[0023]
The boiler management method at the time of boiler recovery of the present invention is not limited to the method described in the above embodiment, and various changes, additions, and deletions are possible.
For example, the waste water treatment of the high concentration drug solution remaining in the deaerator 14 and the boiler 17 and the process of reducing the concentration of the high concentration drug solution in the condenser 11 were performed in parallel, but at different timings. You may go.
Further, the circulation path including the condenser is formed, and the concentration of the high concentration drug solution is reduced while circulating the high concentration drug solution in the condenser 11 to the circulation path. The method for reducing the concentration of the drug solution is not limited to this. For example, without forming a circulation path, water can be injected into the condenser 11 to reduce the concentration of the high concentration drug solution.
Moreover, when draining the high concentration chemical solution remaining in the deaerator 14 or the boiler 17, some but not all may be drained.
Moreover, although the case where it applied to a thermal power plant was demonstrated, the management method of the boiler at the time of boiler recovery of this invention can be applied to various thermal power plants other than a thermal power plant.
[0024]
【The invention's effect】
As described above, if the boiler management method according to any one of claims 1 to 8 is used, it is possible to reduce the work amount at the time of boiler storage or boiler recovery, and it is possible to shorten the work time. .
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an example of a thermal power plant.
2 is a schematic configuration diagram of a condensate system of the thermal power plant shown in FIG. 1. FIG.
FIG. 3 is a diagram illustrating an embodiment of a boiler management method during boiler storage according to the present invention.
FIG. 4 is a diagram illustrating an embodiment of a boiler management method during boiler storage according to the present invention.
FIG. 5 is a diagram illustrating an embodiment of a boiler management method during boiler storage according to the present invention.
FIG. 6 is a diagram illustrating a conventional boiler management method during boiler storage.
FIG. 7 is a diagram for explaining a conventional boiler management method during boiler storage.
FIG. 8 is a diagram for explaining a conventional boiler management method during boiler storage.
FIG. 9 is a diagram illustrating a conventional boiler management method during boiler storage.
FIG. 10 is a diagram for explaining a conventional boiler management method during boiler storage.
FIG. 11 is a diagram for explaining a conventional boiler management method during boiler storage.
FIG. 12 is a diagram for explaining a conventional boiler management method during boiler storage.
FIG. 13 is a diagram illustrating an embodiment of a boiler management method at the time of boiler recovery according to the present invention.
FIG. 14 is a diagram illustrating an embodiment of a boiler management method at the time of boiler recovery according to the present invention.
FIG. 15 is a diagram illustrating an embodiment of a boiler management method at the time of boiler recovery according to the present invention.
FIG. 16 is a diagram for explaining a conventional boiler management method during boiler recovery.
FIG. 17 is a diagram for explaining a conventional boiler management method during boiler recovery.
FIG. 18 is a diagram for explaining a conventional boiler management method during boiler recovery.
FIG. 19 is a diagram for explaining a conventional boiler management method during boiler recovery.
[Explanation of symbols]
11 Condenser
12 Condensate pump
13 Low pressure water heater
14 Deaerator
15 Water supply pump
16 High pressure water heater
17 Boiler
18 Circulation pump

Claims (8)

Condenser, deaerator, boiler, boiler for condensing boilers in a thermal power plant with a condensate pipe provided between the condenser and the deaerator, and a water supply pipe provided between the deaerator and the boiler Management method,
With the chemical solution remaining in at least the condenser, condensate piping and deaerator, the chemical is injected into the circulation path including the condenser, deaerator and condensate piping to obtain a predetermined concentration. Producing a drug solution;
A step of supplying a chemical solution having a predetermined concentration generated by a circulation path from a deaerator to a boiler via a water supply pipe;
Injecting the drug into the boiler to adjust the concentration of the drug solution in the boiler;
A boiler management method comprising: 2. The boiler management method according to claim 1, wherein the step of generating a chemical solution of a predetermined concentration by a circulation path includes a chemical solution in a condenser, a condenser pipe, a deaerator, a water supply pipe, and the boiler. Boiler management method in a state where there is residual. The boiler management method according to claim 2, wherein the chemical solution of a predetermined concentration generated by the circulation path remains in the boiler before the step of supplying the chemical solution from the deaerator to the boiler through the water supply pipe. A boiler management method comprising a step of draining a part of a drug solution. The boiler management method according to claim 3, wherein the step of generating a drug solution having a predetermined concentration by a circulation path and the step of draining a part of the drug solution remaining in the boiler are performed in parallel. Management method. 3. The boiler management method according to claim 2, wherein the chemical in the water supply pipe is supplied before the step of supplying the chemical solution having a predetermined concentration generated by the circulation path from the deaerator to the boiler via the water supply pipe. A boiler management method comprising a step of draining a solution. Condenser, deaerator, boiler, condensate pipe provided between condenser and deaerator, boiler at the time of boiler recovery in a thermal power plant having a water supply pipe provided between the deaerator and boiler Management method,
A step of adjusting the concentration of the chemical solution in the condenser by injecting water into the condenser with at least the chemical solution remaining in the condenser pipe and the water supply pipe;
Draining the drug solution remaining in the deaerator,
A step of supplying the drug solution from the condenser to the deaerator through the condensate pipe in a state where the drug solution supplied into the deaerator is drained at the beginning of the supply;
Draining the chemical solution remaining in the boiler;
The process of supplying the chemical solution from the deaerator to the boiler via the water supply pipe in a state where the chemical solution supplied into the boiler is drained at the beginning of supply,
A boiler management method comprising: The boiler management method according to claim 6, wherein the step of adjusting the concentration of the drug solution in the condenser and the step of draining the drug solution remaining in the deaerator are performed in parallel. Management method. The boiler management method according to claim 6, wherein the step of adjusting the concentration of the drug solution in the condenser and the step of draining the drug solution remaining in the deaerator and the boiler are performed in parallel. How to manage the boiler.

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