JP4808208B2 - Condenser water chamber level switch - Google Patents

Description

  The present invention relates to a condenser water chamber level switch for detecting whether or not the amount of seawater flowing into a water chamber has reached a normal water level in a condenser provided in a thermal power generation facility or a nuclear power generation facility. About.

  In general, in a thermal power generation facility and a nuclear power generation facility (hereinafter referred to as a power plant), steam is generated by heating boiler water and coolant in a boiler and a nuclear reactor, and a steam turbine is driven by the generated steam. is doing. The steam that has passed through the steam turbine is cooled and liquefied by the condenser. In the condenser, a large amount of seawater as cooling water is sent to the heat exchanging section by a circulation pump through the intake channel, and is exchanged with steam, and then discharged to the sea through the discharge channel.

  A predetermined amount of seawater flows into the water chamber of the condenser. A condenser water chamber level switch for detecting whether or not the amount of seawater in the water chamber has reached a normal water level is disposed outside the water chamber of the condenser. This condenser water chamber level switch is composed of a pipe for introducing a part of seawater flowing into the water chamber, a float housing part for arranging a float, a switch control unit provided above the float housing part, and one end to the float. It has a rod shaft that is fixed and whose other end extends to the switch controller.

  Such a condenser water chamber level switch introduces a part of seawater that is to reach a predetermined amount in the water chamber of the condenser into the float housing section. Therefore, the float in the float housing unit moves upward in accordance with the seawater (water level) that is about to reach a predetermined amount in the water chamber of the condenser. Thereby, the presence / absence of the detection signal is determined based on whether or not the other end of the rod shaft pushed up by the float reaches a predetermined portion of the switch control unit. That is, in order for the condenser water chamber level switch to operate normally, the sea level of the float housing section rises in the same manner as the sea water level that is about to reach a predetermined amount in the water chamber of the condenser, and The smooth operation of the float according to this water level is important.

Conventionally, the float housing part of the condenser water chamber level switch is made of a casting, and its inner wall is lined with resin so as not to be affected by seawater. There are also known measures to prevent the attachment and breeding of marine organisms to various members that come into direct contact with seawater by electrolyzing seawater in the vicinity of the condenser water chamber to generate hypochlorous acid ( For example, see Patent Document 1).
JP 2002-219468 A

  Even if the above measures are taken, the float storage part of the condenser water chamber level switch is gradually polluted by marine organisms and other impurities contained in the seawater as the operating time of the power plant elapses. Therefore, it is inevitable that deposits adhere to the inner wall of the float housing part.

  When the adhesion of the deposit in the float accommodating portion increases, there is a concern that the float may malfunction. For this reason, it is necessary to clean an inner wall part at the time of the disassembly inspection of a float accommodating part. When cleaning the inside of the float housing part, the lining of the inner wall is often damaged. For this reason, there was a problem that seawater entered from the damaged lining and the cast body of the float housing part was easily corroded. When corrosion of the inner wall proceeds, the float housing portion swells due to rust and narrows the inner diameter (see FIG. 5). As a result, the float housing portion becomes impeded by the movement of the float, and therefore must be replaced before causing a float malfunction.

  The present invention has been made in view of the circumstances as described above, and particularly relates to a float housing part of a water chamber level switch of a condenser using seawater as a cooling medium. It is an object of the present invention to provide a condenser water chamber level switch that can greatly reduce concerns and contribute to longer life and improved work efficiency.

  The present inventor has found that the main body of the float housing part, which has conventionally been a casting, can be suitably manufactured from stainless steel that does not cause fatal damage to the inner wall (lining, etc.), and provides the following configuration To do.

  (1) A float that moves up and down in accordance with the liquid level, a rod shaft member that is fixed at one end to the float and transmits the vertical movement of the float, and a guide portion that guides the vertical movement of the rod shaft member A switch control unit that is turned on and off in response to the vertical movement of the other end of the rod shaft member, and a first opening and a second opening for receiving and supplying water at the lower and upper sides of the float, respectively. A float housing part using a first stainless steel pipe having a first connecting pipe using a second stainless steel pipe connected to the first opening, and a second connecting part connected to the second opening. A condenser water chamber level comprising: a second connecting pipe using a stainless steel pipe of 3; and a fastening member for detachably connecting the float housing part and the guide part. switch.

  (2) The fastening member includes a first flange provided at one end of the first stainless steel pipe and a plurality of implantation bolts protruding from the first flange, and the first connection pipe is a joint. The condenser water chamber level switch according to (1), further comprising a second flange on a side, and the second connecting pipe having a third flange on a joint side.

  (3) The first flange and the stud bolt are made of the same kind of stainless steel as the first stainless steel pipe, and the second flange is made of the same kind of stainless steel as the second stainless steel pipe. The condenser water chamber level switch according to (2), wherein the third flange is made of the same type of stainless steel as the third stainless steel pipe.

  (4) The condenser water chamber according to any one of (1) to (3), wherein the first, second, and third stainless steel pipes are made of the same type of stainless steel. Level switch.

  (5) The condenser water chamber level switch according to any one of (1) to (3), wherein inner surfaces of the first, second, and third stainless steel pipes are coated with salt resistance.

  According to the present invention, regarding the water chamber level switch of the condenser provided in the power plant, the float housing part body is formed of the stainless steel pipe, so that it is possible to realize a body structure that is not easily affected by seawater. As a result, it is possible to greatly reduce the concern about damage to the inner wall during disassembly and cleaning, thereby contributing to longer life and improved work efficiency. Moreover, since such stainless steel pipes are available in appropriate types and dimensions as defined by JIS (Japanese Industrial Standards), it is easy to process and manufacture the desired type, and the manufactured float housing body is an existing one. It can be installed without any problems.

  FIG. 1 is a schematic view of a condenser water chamber level switch according to the present invention. The condenser water chamber level switch 1 is disposed on a predetermined portion of the outer wall of the condenser 100. The condenser 100 circulates seawater as cooling water to exchange heat with steam from the steam turbine. As is well known, the condenser 100 causes a predetermined amount of seawater to be circulated through a tube nest (collection of narrow tubes) that performs heat exchange into a water chamber at the tube nest end. The condenser water chamber level switch 1 is configured such that when a part of seawater that is about to reach a predetermined amount is supplied in the water chamber of the condenser 100, the seawater in the water chamber reaches a predetermined amount (water level). Detect whether or not.

  The condenser water chamber level switch 1 includes a float housing part 2, a guide part 3, and a switch control part 4. Basically, only the float housing part 2 is exposed to seawater. The float 5 indicated by a broken line accommodated in the float accommodating portion 2 moves up and down in accordance with the liquid level of inflowing seawater or the like. The float 5 has a somewhat elliptical shape, and some of the floats 5 are made of castings and some of them are made of resin members. The float 5 may be made of stainless steel having excellent corrosion resistance. One end of a rod shaft member 6 is fixed to the float 5. The rod shaft member 6 has, for example, an iron core 7 at the other end, and transmits the vertical movement of the float 5 to the switch control unit 4 via the guide unit 3. The switch control unit 4 includes, for example, an iron core cylinder 8 and is configured to control on / off of a switch 9 that is operated by a reaction of a magnet (not shown) arranged around the iron core cylinder 8. . For example, when the other end of the rod shaft member 6 rises as the float 5 rises and the iron core 7 approaches a predetermined position of the iron core cylinder 8, a magnet (not shown) arranged around the iron core cylinder 8 reacts, 9 changes from off to on. Further, for example, when the other end of the rod shaft member 6 is lowered in accordance with the lowering of the float 5 and the iron core 7 is moved away from a predetermined position of the iron core cylinder 8, a magnet (not shown) arranged around the iron core cylinder 8 reacts. The switch 9 changes from on to off. Accordingly, the switch control unit 4 holds a detection signal corresponding to whether the switch 9 is turned on or off.

  The float housing part 2 of the condenser water chamber level switch 1 according to the present invention comprises a stainless steel pipe 13 having a first opening part 11 and a second opening part 12 for water supply and drainage respectively below and above the float 5 as a main body. To do. A stainless steel pipe 14 is connected to the first opening 11 as a first connection pipe. In addition, a stainless steel pipe 15 is connected to the second opening 12 as a second connection pipe.

  The float accommodating portion 2 includes a flange 16 and a planting bolt 17 protruding from the flange 16 as a fastening member for detachably connecting to the guide portion 3 in the stainless steel pipe 13. The stud bolt 17 passes through a fastening hole opened in the flange of the guide portion 3 and is fixed with a nut (not shown).

  As the first connection pipe, the stainless steel pipe 14 includes a flange 18 on the joint side, and as the second connection pipe, the stainless steel pipe 15 includes a flange 19 on the joint side. Thereby, it connects so that some seawater according to seawater amount (water level) may be led from existing equipment which guides seawater of the water room of condenser 100, for example, pipe P1 connected with a water room. The pipes P2 to P8, the flanges F, and the lid panel D are connected at appropriate places. Here, the stainless steel pipe 14 is connected to the pipe P7 by fitting the fastening holes of the flanges (18 and F) with each other and fastening them with bolts and nuts. Further, the stainless steel pipe 15 is connected to the pipe P8 by fitting the fastening holes of the flanges (19 and F) with each other and fastening them with bolts and nuts. Adhesion is improved by interposing a resin member (not shown) between the flanges.

  As described above, the stainless steel pipe 14 and the flange 18 as the first connection pipe and the stainless steel pipe 15 and the flange 19 as the second connection pipe are, for example, the pipe P7, the flange F, and the pipe P8 of the existing equipment. It is preferable that the dimensions and shape are suitable for fitting to the flange F. In that respect, the main body of the float housing part 2 of the condenser water chamber level switch 1 and each connection pipe are mainly made of stainless steel pipes and flanges, so that they can be easily incorporated into existing equipment.

  FIG. 2 is a side view showing a configuration relating to the float housing part 2 of the condenser water chamber level switch 1 according to the present invention. FIG. 3 is a top view of the configuration of FIG. The same parts as those in FIG. The stainless steel pipe 13 which is the main body of the float housing part 2 is preferably made of SUS316 having a nominal diameter of 100A defined by the JIS standard. For the thickness and the inner diameter associated therewith, the schedule 40 is adopted (thickness 6 mm, inner diameter 102.3 mm). SUS316 is a stainless steel that contains approximately 18% Cr and 12% Ni as main features, and has Mo added thereto to improve corrosion resistance and pitting corrosion resistance. SUS316 has superior corrosion resistance to various media including seawater than SUS304, which is a general stainless steel. A flange 16 and a stud bolt 17 welded to the stainless steel pipe 13 are also made of SUS316. The thickness of the flange 16 may be 6 mm or more because of the strength of the stud bolt 17. Six implantation bolts 17 having a diameter of 16 mm are provided. Of course, the dimensions and shape of the flange 16 and the stud bolt 17 are matched to the dimensions and shape of the connecting portion of the guide portion 3 on the switch control portion 4 side.

  The stainless steel pipe 14 and the flange 18 which are the first connection pipes are also made of SUS316 as described above. For example, the stainless steel pipe 14 employs SUS316 and schedule 40 having a nominal diameter of 25A. Such a stainless steel pipe 14 is welded so as to be inserted into the stainless steel pipe 13 in order to form the opening 11 in the stainless steel pipe 13. The flange 18 is configured in consideration of connection with an existing joint (flange F in FIG. 1), and four fastening holes 20 are opened.

  Further, the stainless steel pipe 15 and the flange 19 which are the second connection pipes are also made of SUS316 as described above. For example, the stainless steel pipe 15 also employs SUS316 and schedule 40 having a nominal diameter of 25A. Such a stainless steel pipe 15 is welded so as to be inserted into the stainless steel pipe 13 in order to form the opening 12 in the stainless steel pipe 13. The flange 19 is configured in consideration of connection with an existing joint (flange F in FIG. 1), and four fastening holes 20 are opened.

  It is preferable that the inner surfaces of the stainless steel pipes 13, 14 and 15 in the float housing part 2 as described above are subjected to salt-resistant coating. For example, the salt-resistant coating 30 employs lining (coating) with an epoxy resin having a thickness of several mm. Thereby, lifetime improvement of the float accommodating part 2 can be achieved.

  The dimensions and shapes of the stainless steel pipe 13, flange 16 and stud 17 as well as the stainless steel pipe 14 and flange 18, stainless steel pipe 15 and flange 19 which are the main bodies of the float housing part 2 as described above are the same as those of existing equipment. It is selected considering the ease of incorporation. Depending on the existing equipment, it is conceivable to use means in place of the flange. In addition, the above stainless steel pipes and flanges have been shown to be made of the same type of stainless steel in consideration of processing such as welding, but there is no problem with assembly processing, strength, and corrosion resistance (such as lining and coating). It is also conceivable that the stainless steel pipe and the flange are not composed of the same type of stainless steel.

  According to the condenser water chamber level switch 1 configured as described above, the main body of the float housing part 2 is extremely difficult to be affected by seawater. ) Damage is not fatal. Therefore, care such as having to clean more carefully is unnecessary. For example, when the salt-resistant coating (30) is applied to the inner surface of the float housing part 2, the salt-resistant coating may be peeled off by cleaning or the like. At that time, it can be easily repainted by epoxy resin coating or the like. Moreover, the float accommodating part 2 can be suitably manufactured by a stainless steel pipe and a flange, and can be easily incorporated into existing equipment. As a result, regarding the float housing part of the water chamber level switch of the condenser, the condensate is less susceptible to seawater and can greatly reduce the risk of damage to the inner wall during disassembly and cleaning, contributing to longer life and improved work efficiency. A water chamber level switch can be provided.

  FIG. 4 is a schematic diagram showing an example of a power plant in which the condenser water chamber level switch 1 as described above is arranged. The figure shows a combined power plant. Combined power generation is a combined power generation facility that combines a gas turbine and a steam turbine. In this system, LNG (liquefied natural gas) is burned to rotate a gas turbine, boiler water is boiled by exhaust heat generated at that time, and the steam turbine is further rotated by the steam to generate electric power. A combined power plant is characterized by high efficiency and excellent ability to adjust power demand.

  In FIG. 4, fuel gas (LNG) is fed into the combustor to rotate the gas turbine 201. At that time, the air compressor 202 sends compressed air to the combustor as the gas turbine 201 rotates. The exhaust heat from the gas turbine 201 generates steam in the exhaust heat recovery boiler 203. The steam from the exhaust heat recovery boiler 203 is sent to a steam turbine (for example, HP: for high pressure, IP: for medium pressure, LP: for low pressure) 204 through each steam line 205. The generator 206 generates electricity by the rotation of the gas turbine 201 and each steam turbine 204, and the electric power is transmitted through the transformer 207 and the switch station 208.

  The condenser 100 cools and liquefies the steam that has passed through the steam turbine. In the condenser 100, seawater as cooling water is taken into the water chamber via various pumps (not shown) and the intake channel 209. Then, seawater is sent to a heat exchange part (tube nest (aggregate of thin tubes)) by a circulation pump (not shown). Seawater after heat exchange with steam is discharged into the sea through various pumps (not shown) and the water discharge channel 210. Condensate is used again for steam generation in the exhaust heat recovery boiler 203 via a water supply line.

  The condenser water chamber level switch 1 according to the present invention is disposed in a predetermined part of the outer wall of the water chamber of the condenser 100, and is a unit of seawater that is to reach a predetermined amount in the water chamber of the condenser 100. Parts are supplied. Thereby, it is detected whether or not the seawater in the water chamber has reached a predetermined amount (water level). When notification and confirmation are obtained by a signal that detects that the amount of seawater in the water chamber has reached a predetermined amount (water level), the seawater in the water chamber is converted into a heat exchanger (tube nest ( It moves to the next stage, such as being sent to a collection of tubules)).

  As described above, the combined power plant is highly efficient and has an excellent ability to adjust power demand. Therefore, the period of operation / non-operation may be irregular, and antifouling measures for parts exposed to seawater are very important. In that respect, the condenser water chamber level switch 1 according to the present invention is made of stainless steel in which the damage to the inner wall (lining, etc.) does not cause a fatal damage in the float housing portion 2, and is easy to be incorporated into existing equipment. Made of readily available stainless steel pipe and flange. As a result, as an antifouling measure, cleaning is easy even in disassembly inspection and cleaning of the float housing part 2, and for example, even if the inner surface of the salt-resistant coating is peeled off, it can be easily repainted. In other words, there is no problem even if the coating is somewhat rough. The service life is also greatly increased. In the present invention, for example, as in a conventional condenser water chamber level switch 51 as shown in FIG. 5, the inner diameter of the cast-type float housing 53 is damaged due to damage to the inner wall lining and subsequent corrosion (rust). There is little concern about narrowing. In the present invention, for example, the smooth inner surface of the float housing portion 2 as shown in FIG. 3 can be maintained for a long time.

It is a general-view figure of the condenser water chamber level switch which concerns on this invention. It is a side view which shows the structure regarding the float accommodating part of the condenser water chamber level switch which concerns on this invention. It is a top view of the structure of FIG. It is the schematic which shows an example of the power plant in which the condenser water chamber level switch concerning this invention was arrange | positioned. It is a figure which shows the unpreferable inner wall of the float accommodating part of the conventional condenser water chamber level switch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Condenser water chamber level switch 2 Float accommodation part 3 Guide part 4 Switch control part 5 Float 6 Rod shaft member 7 Iron core 8 Iron core cylinder 9 Switch 11 1st opening part 12 2nd opening part 13 Stainless steel pipe 14 Stainless steel pipe 15 Stainless steel Steel pipe 16 Flange 17 Stud bolt 18 Flange 19 Flange 20 Fastening hole 30 Salt resistant coating 51 Conventional condenser water chamber level switch 53 Inner wall damage of casting type float housing part 201 Gas turbine 202 Air compressor 203 Waste heat recovery boiler 204 Steam Turbine 205 Steam line 206 Generator 207 Transformer 208 Switching station 209 Intake channel 210 Discharge channel

Claims (5)

A float that moves up and down according to the liquid level;
One end is fixed to the float, and a rod shaft member for transmitting the vertical movement of the float;
A guide portion for guiding the vertical movement of the rod shaft member;
A switch controller that turns on and off according to the vertical movement of the other end of the rod shaft member;
A float housing section that houses the float and uses a first stainless steel pipe having a first opening and a second opening for water supply and drainage respectively below and above the float;
A first connection pipe using a second stainless steel pipe connected to the first opening;
A second connecting pipe using a third stainless steel pipe connected to the second opening;
A fastening member for detachably connecting the float housing part and the guide part,
A condenser water chamber level switch characterized by comprising:   The fastening member includes a first flange provided at one end of the first stainless steel pipe and a plurality of studs projecting from the first flange, and the first connection pipe is disposed on the joint side. 2. The condenser water chamber level switch according to claim 1, further comprising a second flange, wherein the second connection pipe includes a third flange on a joint side.   The first flange and the stud bolt are made of the same kind of stainless steel as the first stainless steel pipe, and the second flange is made of the same kind of stainless steel as the second stainless steel pipe, 3. The condenser water chamber level switch according to claim 2, wherein the three flanges are made of the same type of stainless steel as the third stainless steel pipe.   4. The condenser water chamber level switch according to claim 1, wherein the first, second, and third stainless steel pipes are all made of the same type of stainless steel. 5.   The condenser water chamber level switch according to any one of claims 1 to 3, wherein the inner surfaces of the first, second, and third stainless steel pipes are subjected to salt-resistant coating.

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