JP5583786B2 - Molten salt detection device, fluidized bed boiler and stoker furnace, molten salt detection method - Google Patents

Description

The present invention relates to a molten salt detection device capable of detecting that molten salt generated in a boiler has adhered to the boiler, a fluidized bed boiler and stoker furnace equipped with the molten salt detection device, and a molten salt detection method .

  Conventionally, as described in Patent Document 1 below, biomass fuels and waste fuels contain salts such as Na, K, Cl, etc., and by burning these fuels, such as KCl, NaCl, etc. It is known that molten salts are produced and these molten salts adhere to the surface of the heat transfer tube and corrode.

JP 2006-308179 A

  Therefore, in order to cope with the corrosion, it is desired to develop a detection means capable of detecting that the molten salt has adhered to the boiler.

The present invention has been made to solve such a problem, and a molten salt detection device capable of detecting that molten salt generated in a boiler has adhered to the boiler, and a fluidized bed boiler provided with the same. And a stoker furnace and a molten salt detection method .

  A molten salt detection device according to one aspect of the present invention is a molten salt detection device arranged in a boiler, and a test electrode and a reference electrode arranged apart from each other and a molten salt generated in the boiler are tested. And a detection unit that detects electrical continuity between the test electrode and the verification electrode when attached across the electrode and the verification electrode.

  In this molten salt detection apparatus, when the molten salt generated in the boiler adheres across the test electrode and the verification electrode, the test electrode and the verification electrode are brought into conduction, and this conduction is detected by the detection unit. Therefore, it can be detected that the molten salt generated in the boiler has adhered to the boiler.

  Here, the detection unit may detect vibration of the potential of the test electrode with respect to the reference electrode. In this way, after the molten salt generated in the boiler adheres across the test electrode and the reference electrode, the test electrode wears due to the corrosion of the test electrode due to the adhered molten salt or the collision of the fluidized material flowing in the boiler. When this occurs, it is possible to detect these wears and to determine whether these wears are local or full based on the vibration of the detected potential.

  Moreover, you may provide the determination part which determines the form of the abrasion which generate | occur | produced in the test electrode based on the vibration of the electric potential which a detection part detects. In this way, it is possible to automatically determine whether the wear generated on the test electrode is local or complete.

  Moreover, you may provide the cooling part which cools a test electrode and a collation electrode. In this way, it becomes possible to cool the test electrode and the verification electrode to the same temperature as the heat transfer tube to which the molten salt adheres in the boiler, and the molten salt generated in the boiler adheres across the test electrode and the verification electrode. This can be reliably detected.

  The fluidized bed boiler which concerns on one side of this invention is a fluidized bed boiler provided with the above-mentioned molten salt detection apparatus, Comprising: The test electrode and the collation electrode are provided in the vicinity of the heat exchanger and at least one of the furnace. In this fluidized bed boiler, the test electrode and the reference electrode of the above-mentioned molten salt detection device are provided in the vicinity of the heat exchanger and at least one of the furnace, so it is detected that the molten salt has adhered to the heat exchanger or the furnace. it can.

  Moreover, you may provide the warning part which issues a warning when an abnormal value is detected by the detection part. In this way, the operator can be surely notified that an abnormal value has been detected by the detection unit.

  A stoker furnace according to one aspect of the present invention is a stoker furnace including the above-described molten salt detection device, and the test electrode and the verification electrode are provided in the vicinity of the heat exchanger. Since this stoker furnace is equipped with the test electrode and verification electrode of the above-mentioned molten salt detection apparatus in the vicinity of the heat exchanger, it can detect that molten salt has adhered to the heat exchanger.

  Moreover, you may provide the warning part which issues a warning when an abnormal value is detected by the detection part. In this way, the operator can be surely notified that an abnormal value has been detected by the detection unit.

ADVANTAGE OF THE INVENTION According to this invention, the molten salt detection apparatus which can detect that the molten salt generate | occur | produced in the boiler adhered in the boiler, a fluidized bed boiler provided with this, a stoker furnace , and a molten salt detection method can be provided. .

It is a schematic sectional drawing which shows the molten salt detection apparatus which concerns on embodiment. It is a figure which shows the example of the adhesion state of molten salt in case conduction | electrical_connection is detected. It is a schematic sectional drawing which shows the adhesion state of molten salt. It is a schematic sectional drawing which shows the state which the local corrosion generate | occur | produced in the test electrode by adhesion of molten salt. It is a time-dependent change figure of the potential when local wear has occurred in a test electrode. It is a time-dependent change figure of the electric potential at the time of whole wear generating to a test electrode. It is a schematic structure figure showing a fluid bed boiler concerning an embodiment. It is a schematic block diagram which shows the stoker furnace which concerns on embodiment.

  Hereinafter, a preferred embodiment of a molten salt detection device will be described in detail with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view illustrating a molten salt detection device according to an embodiment, and FIG. 2 is a diagram illustrating an example of a molten salt adhesion state when conduction is detected.

  The molten salt detection device 1 is for detecting that the molten salt generated in the boiler has adhered to the boiler, and includes a test electrode 2, a verification electrode 3, a cooling unit 4, and a detection unit 5. .

  The test electrode 2 has a connection terminal 21 extending in the horizontal direction in the figure and a disk-like test electrode part 22 connected to an end of one side (right side in the figure) of the connection terminal 21 (FIG. 2). reference). The test electrode 2 is made of a material similar to that used for a heat transfer tube or the like in the boiler, and here, carbon steel is used.

  The verification electrode 3 is a reference electrode, has the same shape as the test electrode 2, and includes a connection terminal 31 and a verification electrode portion 32 connected to the connection terminal 31. The reference electrode 3 is made of a material that is not corroded by salt, and here, platinum is used.

  The test electrode 2 and the reference electrode 3 are arranged apart from each other in a sheath 6 that is a cylindrical metal tube having the same length as these, and at one end of the sheath 6, The test electrode unit 22 and the verification electrode unit 32 are exposed on the surface, and at the other end of the sheath 6, the wiring from the detection unit 5 is connected to the connection terminal 21 and the connection terminal 31, respectively. The sheath 6 is filled with an insulating material 61 so that the test electrode 2 and the verification electrode 3 are insulated from each other.

  The cooling unit 4 is for cooling the test electrode unit 22 of the test electrode 2 and the verification electrode unit 32 of the verification electrode 3, and includes a cooling pipe 41, a thermocouple 42, and a cooling control unit 43. .

  The cooling pipe 41 sends cooling air for cooling the test electrode part 22 and the verification electrode part 32, and is arranged in the sheath 6 so as to be in contact with the back surfaces of the test electrode part 22 and the verification electrode part 32. .

  The thermocouple 42 is for measuring the temperature of the verification electrode part 32, and is arranged in the sheath 6 so that the tip thereof is in contact with the back surface of the verification electrode part 32. Note that the temperature of the test electrode unit 22 may be measured by arranging the tip of the thermocouple 42 so as to be in contact with the back surface of the test electrode unit 22.

  The cooling control unit 43 adjusts the amount of cooling air sent to the cooling pipe 41 based on the temperature measured by the thermocouple 42 by controlling the driving of, for example, a blower. The electrode part 32 can be cooled to a desired temperature. Here, the cooling temperature of the test electrode unit 22 and the verification electrode unit 32 is set to 300 ° C. to 400 ° C., which is the same temperature as the heat transfer tube to which the molten salt S adheres in the boiler.

  The detection unit 5 is for detecting conduction between the test electrode 2 and the verification electrode 3, and detects the potential of the test electrode 2 with respect to the verification electrode 3.

  The sheath 6 including the test electrode 2, the verification electrode 3, the cooling pipe 41, and the thermocouple 42 as described above is disposed in, for example, a CFB (circulating fluidized bed boiler) in which a fluid material flows. In this CFB, a fuel containing biomass, waste, or the like is burned, and the temperature in the boiler is set to 800 ° C. to 900 ° C. here. And since the test electrode part 22 and the collation electrode part 32 are cooled by the cooling part 4 and set to the same temperature as the heat transfer tube to which the molten salt S adheres in the boiler, the molten salt generated in the boiler S easily adheres to the test electrode unit 22 and the verification electrode unit 32.

  As shown in FIG. 2, when the molten salt S adheres across the test electrode unit 22 and the verification electrode unit 32, potentials are generated in the test electrode 2 and the verification electrode 3, respectively. Conduction between. Here, the potential generated at the test electrode 2 and the potential generated at the verification electrode 3 are different because the test electrode 2 and the verification electrode 3 are made of different materials. The potential of the electrode 2 is detected. That is, conduction between the test electrode 2 and the verification electrode 3 is detected.

  3 is a schematic cross-sectional view showing a state of adhesion of the molten salt, FIG. 4 is a schematic cross-sectional view showing a state in which local corrosion has occurred on the test electrode due to adhesion of the molten salt, and FIG. 5 is a diagram showing local wear on the test electrode. FIG. 6 is a time-dependent change diagram of potential when full wear occurs on the test electrode.

  As shown in FIGS. 3 and 4, the surface of the test electrode portion 22 is oxidized by being exposed to high-temperature combustion gas in the boiler, and an oxide film 22a is formed on the surface. As shown in FIG. 3, in a state where the molten salt S adheres across the test electrode part 22 and the verification electrode part 32 (see FIG. 2), the potential of the test electrode 2 with respect to the verification electrode 3 is constant (FIG. 5). (See potential E1).

  Here, after the molten salt S adheres across the test electrode portion 22 and the verification electrode portion 32, the oxide film 22a of the test electrode portion 22 is locally broken by corrosion by the molten salt S as shown in FIG. When the molten salt S reaches the test electrode section 22, as shown in FIG. 5, the constant potential E1 immediately decreases to the potential E2, and then the potential value gradually decreases at a rate slower than the rate of the decrease. A vibration pattern with a large amplitude and a long period of increasing is generated. Note that such a vibration pattern of the potential is such that after the molten salt S adheres across the test electrode unit 22 and the verification electrode unit 32, a fluid material such as silica sand that flows in the boiler collides with the test electrode unit 22. Thus, it is also detected when the test electrode portion 22 is locally worn.

  In addition, when the molten salt S causes overall corrosion rather than local, a small-amplitude short-cycle vibration pattern is generated in which the potential vibrates repeatedly increasing and decreasing as shown in FIG. Note that such a vibration pattern of the potential is such that after the molten salt S adheres across the test electrode unit 22 and the verification electrode unit 32, a fluid material such as silica sand that flows in the boiler collides with the test electrode unit 22. Thus, it is also detected when the test electrode portion 22 is completely worn.

  The detection unit 5 wears (corrosion, wear) of the test electrode unit 22 due to corrosion of the test electrode unit 22 due to the adhering molten salt S or wear of the test electrode unit 22 due to collision of a fluid material flowing in the boiler. 5 is detected, and it is determined whether the detected potential vibration pattern corresponds to the vibration pattern shown in FIG. 5 or FIG. 6, and whether these wears are local or complete. It is determined whether it is.

  As described above, in the molten salt detection device 1 according to the present embodiment, when the molten salt S generated in the boiler adheres across the test electrode unit 22 and the verification electrode unit 32, the test electrode 2 and the verification electrode 3 Since the continuity is conducted and this conduction is detected by the detection unit 5, it is possible to detect that the molten salt S generated in the boiler has adhered to the boiler. Moreover, in this molten salt detection apparatus 1, since the detection part 5 can detect the conduction | electrical_connection between the test electrode 2 and the collation electrode 3 without providing an additional power supply, a disturbance is not input from a power supply, but a boiler. It is possible to accurately detect that the molten salt S generated inside has adhered to the boiler.

  Further, since the detection unit 5 determines the form of wear generated in the test electrode unit 22 based on the vibration of the detected potential, whether the wear generated in the test electrode unit 22 is local or entirely Can be automatically determined.

  Moreover, since the cooling unit 4 for cooling the test electrode unit 22 and the verification electrode unit 32 is provided, the test electrode unit 22 and the verification electrode unit 32 can be cooled to the same temperature as the heat transfer tube to which the molten salt S adheres in the boiler. The molten salt S generated in the boiler adheres across the test electrode unit 22 and the verification electrode unit 32, and this can be reliably detected.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the detection unit 5 automatically determines the form of wear generated in the test electrode unit 22 based on the vibration of the detected potential, but displays the detected vibration of the potential on the monitor. Based on the display on the monitor, the operator may determine the form of wear that has occurred in the test electrode unit 22.

  Moreover, in the said embodiment, although the detection part 5 detects continuity by measuring the electric potential of the test electrode 2 with respect to the collation electrode 3, a lamp | ramp is provided in the detection part 5, and the said lamp will be turned on when it conducts. Thus, continuity may be detected.

  Moreover, in the said embodiment, although the two electrodes of the test electrode 2 and the collation electrode 3 are used, this may be made into 3 electrodes and an energization amount may be monitored.

  Moreover, in the said embodiment, although cooling air is used as a cooling medium sent to the cooling pipe 41, it may replace with this and may use a cooling water. In the above embodiment, the molten salt detection device 1 includes the cooling unit 4 and the cooling pipe 41 is built in the sheath 6, assuming that cost reduction and downsizing can be achieved. What is the molten salt detection device 1? Alternatively, a cooling unit may be installed so that the test electrode unit 22 and the verification electrode unit 32 are cooled.

  Moreover, when adhesion of the molten salt on the test electrode unit 22 is detected, the adhesion of the molten salt is reduced by reducing the amount of biomass, waste, etc. contained in the fuel combusted in the boiler according to the form. It is possible to reduce boilers and prevent wear and to extend the life of boilers.

  Next, the fluidized bed boiler according to the embodiment will be described. FIG. 7 is a schematic configuration diagram illustrating a fluidized bed boiler according to the embodiment. As shown in FIG. 7, a fluidized bed boiler 100 includes a furnace 101, a cyclone 102, a first super heater (heat exchanger) 103, a second super heater (heat exchanger) 104, a turbine 105, and a bag filter (dust collector) 106. , A pump 107 and a chimney 108 are provided.

  The furnace 101 is a furnace for burning a fuel containing biomass, waste, or the like. A furnace tube (not shown) is provided inside the furnace 101. In the furnace 101, the heat generated by the combustion of the fuel can be recovered by flowing the steam into the furnace tube. On the side wall of the furnace 101, a fuel input port 101a for supplying fuel is provided.

  A gas outlet 101 b that sends exhaust gas generated by fuel combustion to the cyclone 102 is provided at the upper portion of the furnace 101. An air supply line 101c that introduces air used for fuel combustion, fuel flow, and the like communicates with the lower portion of the furnace 101. At the bottom of the furnace 101, there is provided a discharge port 101d that periodically discharges solids (so-called in-furnace bed material) accumulated in the bottom of the furnace to the outside.

  The cyclone 102 is a solid gas separation device that separates the exhaust gas generated in the furnace 101 into a solid gas. A gas outlet 102 a for sending the exhaust gas after solid-gas separation to the first super heater 103 is provided at the upper part of the cyclone 102. Under the cyclone 102, a return line 102b, which is a pipe for returning the solid particles separated from the exhaust gas to the furnace 101, is provided.

  The first super heater 103 collects heat from the exhaust gas, and is provided in the pipe P <b> 1 on the downstream side of the cyclone 102. The first super heater 103 has a furnace tube (not shown) provided meandering across the pipe P1. The first super heater 103 heat-exchanges the steam in the furnace tube to superheated steam by exchanging heat between the steam flowing in the furnace tube and the exhaust gas, and sends the superheated steam to the turbine 105.

  The second super heater 104 recovers heat from the solid particles after the solid-gas separation by the cyclone 102, and is provided in the return line 102b. The second super heater 104 has a furnace tube (not shown) provided meandering across the return line 102b. The second super heater 104 heat-exchanges the steam in the furnace tube to superheated steam by exchanging heat between the steam flowing in the furnace tube and the solid particles, and sends the superheated steam to the turbine 105. In the turbine 105, power generation is performed using superheated steam from the first super heater 103 and the second super heater 104.

  The bag filter 106 removes fine particles such as fly ash accompanying the exhaust gas, and is provided on the downstream side of the first super heater 103. The pump 107 sends the exhaust gas purified by the bag filter 106 to the chimney 108 and discharges the purified exhaust gas from the chimney 108 to the outside.

  Such a fluidized bed boiler 100 includes a first molten salt detection device 1a, a second molten salt detection device 1b, and a third molten salt detection device 1c that are substantially the same as the molten salt detection device 1 described above.

  The sheath 6 of the first molten salt detection device 1a detects the degree of wear in the furnace tube of the furnace 101 (degree of wear such as adhesion of molten salt, local wear, or overall wear). Is provided. More specifically, the sheath 6 of the first molten salt detection device 1 a is provided in the vicinity of the furnace tube in the furnace 101. That is, the test electrode 2 and the verification electrode 3 incorporated in the sheath 6 are provided in the vicinity of the furnace tube in the furnace 101. In other words, the test electrode 2 and the verification electrode 3 incorporated in the sheath 6 are provided around the furnace tube of the furnace 101. The test electrode unit 22 and the verification electrode unit 32 of the first molten salt detection device 1 a are cooled by the cooling unit 4 to a temperature equivalent to the surface temperature of the furnace tube of the furnace 101.

  The sheath 6 of the second molten salt detection device 1b is provided in the pipe P1 provided with the first super heater 103 in order to detect the degree of wear of the first super heater 103 in the furnace tube. More specifically, the sheath 6 of the second molten salt detection device 1b is provided in the vicinity of the downstream side of the first super heater 103 in the pipe P1. That is, the test electrode 2 and the verification electrode 3 incorporated in the sheath 6 are provided in the pipe P1 provided with the first super heater 103, more specifically, in the vicinity of the downstream side of the first super heater 103. Is provided. In other words, the test electrode 2 and the verification electrode 3 built in the sheath 6 are provided around the first super heater 103. The test electrode unit 22 and the verification electrode unit 32 of the second molten salt detection device 1 b are cooled by the cooling unit 4 to a temperature equivalent to the surface temperature of the furnace tube of the first super heater 103.

  The sheath 6 of the third molten salt detector 1c is provided on the return line 102b provided with the second super heater 104 in order to detect the degree of wear of the second super heater 104 in the furnace tube. More specifically, the sheath 6 of the third molten salt detection device 1c is provided in the vicinity of the downstream side of the second super heater 104 in the return line 102b. That is, the test electrode 2 and the verification electrode 3 incorporated in the sheath 6 are provided in the return line 102b in which the second super heater 104 is provided, and more specifically, in the vicinity of the downstream side of the second super heater 104. Is provided. In other words, the test electrode 2 and the verification electrode 3 incorporated in the sheath 6 are provided around the second super heater 104. The test electrode unit 22 and the verification electrode unit 32 of the third molten salt detector 1 c are cooled by the cooling unit 4 to a temperature equivalent to the surface temperature of the furnace tube of the second super heater 104.

  A warning device (warning unit) 7 is connected to each detection unit 5 of the first molten salt detection device 1a, the second molten salt detection device 1b, and the third molten salt detection device 1c. In this warning device 7, the detection unit 5 detects abnormal values (a constant potential due to adhesion of molten salt, a large-amplitude long-period vibration potential due to local wear, a small-amplitude short-cycle vibration potential due to total wear, etc.). When this happens, a warning sound is emitted or a warning or the like is displayed on the display, thereby warning the operator.

  In such a fluidized bed boiler 100, the fuel input from the fuel input port 101a flows along with the solid matter accumulated at the bottom of the furnace 101 by the air introduced from the air supply line 101c, and is about 800 ° C to 900 ° C. Burn at ℃. The exhaust gas generated by this combustion is sent from the gas outlet 101 b to the cyclone 102 and is separated into solid and gas by the cyclone 102.

  The exhaust gas after the solid-gas separation is sent from the gas outlet 102 a to the first super heater 103, heat exchanged by the first super heater 103 and cooled. The cooled exhaust gas is purified by the bag filter 106 and discharged from the chimney 108 through the pump 107 to the outside.

  Further, the solid particles after the solid-gas separation by the cyclone 102 are sent to the second super heater 104 through the return line 102 b, heat-exchanged by the second super heater 104, cooled, and returned to the furnace 101.

  Here, in the fluidized bed boiler 100, for example, when adhesion of molten salt or local or total wear occurs in the furnace tube of the furnace 101, an abnormal value is detected by the detection unit 5 of the first molten salt detection device 1a. The warning device 7 issues a warning. Further, for example, when adhesion of molten salt or local or total wear occurs in the furnace tube of the first super heater 103, an abnormal value is detected by the detection unit 5 of the second molten salt detection device 1b, and a warning device is provided. 7 gives a warning. Further, when, for example, adhesion of molten salt or local or total wear occurs in the furnace tube of the second super heater 104, an abnormal value is detected by the detection unit 5 of the third molten salt detection device 1c, and a warning device is provided. 7 gives a warning. Therefore, the operator can prevent the fluidized bed boiler 100 from being damaged by stopping the operation of the fluidized bed boiler 100 as necessary and changing the fuel.

  As mentioned above, in the fluidized bed boiler 100 which concerns on this embodiment, since the test electrode 2 and the collation electrode 3 of the 1st molten salt detection apparatus 1a are provided in the furnace 101, the wear degree in the furnace tube of the furnace 101 can be detected.

  Moreover, in the fluidized bed boiler 100, since the test electrode 2 and the verification electrode 3 of the second molten salt detector 1b are provided in the vicinity of the first super heater 103, the degree of wear of the first super heater 103 in the furnace tube is reduced. It can be detected.

  Moreover, in the fluidized bed boiler 100, since the test electrode 2 and the verification electrode 3 of the third molten salt detection device 1c are provided in the vicinity of the second super heater 104, the degree of wear of the second super heater 104 in the furnace tube is reduced. It can be detected.

  Further, since the fluidized bed boiler 100 includes a warning device 7 that issues a warning when an abnormal value is detected by the detection unit 5, the fluid bed boiler 100 reliably notifies the operator that the abnormal value has been detected by the detection unit 5. Can do.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the cooling unit 4, the detection unit 5, and the warning device 7 are provided in the first molten salt detection device 1a, the second molten salt detection device 1b, and the third molten salt detection device 1c, respectively. You may share between these.

  Moreover, in the said embodiment, although the test electrode 2 and the collation electrode 3 of the 2nd molten salt detection apparatus 1b are provided in the downstream vicinity of the 1st superheater 103, It may be provided between meandering furnace tubes. In short, the test electrode 2 and the reference electrode 3 of the second molten salt detection device 1b have the first superheater 103 so that the adhesion of the molten salt generated, local or overall wear, and the like are the same as those of the first super heater 103. It suffices if it is provided within a certain distance from the super heater 103. Similarly, the test electrode 2 and the verification electrode 3 of the first molten salt detection device 1 a in the furnace 101 may be provided within a certain distance from the furnace tube of the furnace 101. Similarly, the test electrode 2 and the verification electrode 3 of the third molten salt detection device 1c in the return line 102b may be provided within a certain distance from the second super heater 104.

  Next, the stoker furnace according to the embodiment will be described. FIG. 8 is a schematic configuration diagram illustrating a stoker furnace according to the embodiment. As shown in FIG. 8, the stoker furnace 200 includes a furnace 201, a stoker 202, a pair of ash bunkers 20 s and 20 s, a super heater (heat exchanger) 204, a bag filter 205, a pump 206, and a chimney 207.

  The furnace 201 is a furnace that burns fuel containing biomass, waste, or the like. On the side wall of the furnace 201, a fuel input port 201a for supplying fuel is provided. A gas outlet 201 b for sending exhaust gas generated by fuel combustion to the super heater 204 is provided at the upper part of the furnace 201. At the bottom of the furnace 201, there are provided outlets 201c and 201d for discharging ash generated by fuel combustion to the ash bunkers 20s and 20s.

  The stalker 202 has a fixed fixed grate stage (not shown) and a moving grate stage (not shown) that reciprocates with respect to the fixed grate stage. The stalker 202 refines the burning fuel while dropping it to the lower stage by the reciprocating motion of the moving grate stage.

  The super heater 204 recovers heat from the exhaust gas generated in the furnace 201, and is provided in the pipe P2 on the downstream side of the furnace 201. The super heater 204 has a furnace pipe (not shown) provided meandering across the pipe P2, and heat exchange is performed between the steam flowing in the furnace pipe and the exhaust gas, thereby Heat the steam in the tube to superheated steam.

  The bag filter 205 removes fine particles such as fly ash accompanying the exhaust gas, and is provided on the downstream side of the super heater 204. The pump 206 sends the exhaust gas purified by the bag filter 205 to the chimney 207 and discharges the exhaust gas after purification from the chimney 207 to the outside.

  Such a stoker furnace 200 includes a molten salt detection device 1d that is substantially the same as the molten salt detection device 1 described above. The sheath 6 of the molten salt detection device 1d is provided with the super heater 204 for detecting the degree of wear of the super heater 204 in the furnace tube (degree of wear such as adhesion of molten salt, local wear, or full wear). Provided in the pipe P2. More specifically, the sheath 6 of the molten salt detection device 1d is provided in the vicinity of the downstream side of the super heater 204 in the pipe P2. That is, the test electrode 2 and the verification electrode 3 incorporated in the sheath 6 are provided in the vicinity of the downstream side of the super heater 204 in the pipe P <b> 2 where the super heater 204 is provided. The test electrode unit 22 and the verification electrode unit 32 of the molten salt detection device 1d are cooled by the cooling unit 4 to a temperature equivalent to the surface temperature of the furnace tube of the super heater 204.

  A warning device 7 is connected to the detection unit 5. In this warning device 7, the detection unit 5 has an abnormal value (a constant potential due to adhesion of molten salt, a large-amplitude long-period vibration potential due to local wear, a small-amplitude short-cycle vibration potential due to overall wear, etc.). When detected, a warning sound is generated or a warning is displayed on the display, thereby warning the operator.

  In such a stoker furnace 200, the fuel input from the fuel input port 201a burns while being refined by the stalker 202. The exhaust gas generated by this combustion is sent from the gas outlet 201b to the super heater 204, and heat is exchanged by the super heater 204 to be cooled. The cooled exhaust gas is purified by the bag filter 106 and discharged from the chimney 108 through the pump 107 to the outside.

  Here, in the stoker furnace 200, for example, when adhesion of molten salt or local or total wear occurs in the furnace tube of the super heater 204, an abnormal value is detected by the detection unit 5 of the molten salt detection device 1d. The warning device 7 issues a warning. Therefore, the operator can prevent damage to the stoker furnace 200 by stopping the operation of the stoker furnace 200 as necessary and changing the fuel.

  As described above, in the stoker furnace 200 according to the present embodiment, the test electrode 2 and the verification electrode 3 of the molten salt detection device 1d are provided in the vicinity of the super heater 204, so that the degree of wear in the super heater 204 can be detected.

  Further, since the stoker furnace 200 is provided with a warning device 7 that issues a warning when an abnormal value is detected by the detection unit 5, the operator can be surely notified that the abnormal value has been detected by the detection unit 5. it can.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the test electrode 2 and the verification electrode 3 of the molten salt detection device 1d are provided in the vicinity of the downstream side of the super heater 204, but in the vicinity of the upstream side of the super heater 204 or between meandering furnace tubes. Etc. may be provided. In short, the test electrode 2 and the reference electrode 3 of the molten salt detection device 1d are at a certain distance from the superheater 204 so that the adhesion of the molten salt generated, local or total wear, and the like are the same as those of the superheater 204. What is necessary is just to be provided in.

  The present invention can detect that the molten salt generated in the boiler has adhered to the boiler.

  DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c, 1d ... Molten salt detection apparatus, 2 ... Test electrode, 3 ... Verification electrode, 4 ... Cooling part, 5 ... Detection part, 7 ... Warning apparatus (warning part), 100 ... Fluidized bed boiler, DESCRIPTION OF SYMBOLS 101 ... Furnace, 103 ... 1st super heater (heat exchanger), 104 ... 2nd super heater (heat exchanger), 200 ... Stoker furnace, 204 ... Super heater (heat exchanger).

Claims (7)

A molten salt detector disposed in a boiler,
A test electrode and a reference electrode spaced apart; and
When the molten salt generated in the boiler adheres across the test electrode and the verification electrode, the detection unit detects conduction between the test electrode and the verification electrode ,
The detection unit detects a vibration of the potential of the test electrode with respect to the reference electrode,
On the basis of the vibration of the potential detecting section detects, further comprising Ru molten salt detecting apparatus determining unit for determining the form of wear that occurred in the test electrode. Molten salt detecting apparatus according to claim 1, further comprising a cooling unit for cooling the test electrode and the reference electrode. A fluidized bed boiler comprising the molten salt detection device according to claim 1 or 2 ,
The test electrode and the reference electrode are fluidized bed boilers provided in the vicinity of a heat exchanger and at least one of a furnace. The fluidized bed boiler according to claim 3 , further comprising a warning unit that issues a warning when an abnormal value is detected by the detection unit. A stoker furnace comprising the molten salt detection device according to claim 1 or 2 ,
The test electrode and the reference electrode are a stoker furnace provided in the vicinity of a heat exchanger. The stoker furnace according to claim 5 , further comprising a warning unit that issues a warning when an abnormal value is detected by the detection unit. A molten salt detection method carried out in a molten salt detection device including a test electrode and a reference electrode disposed in a boiler and spaced apart from each other,
When the molten salt generated in the boiler adheres across the test electrode and the verification electrode, the conduction between the test electrode and the verification electrode is detected, and the test electrode with respect to the verification electrode is detected. Detect potential oscillations,
A molten salt detection method for determining a form of wear generated in the test electrode based on a detected potential vibration.

Images