JP6309709B2 - BOILER WITH CORROSION CONTROL DEVICE AND BOILER CORROSION CONTROL METHOD - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a boiler with a corrosion suppression device including a corrosion suppression device for preventing corrosion of a boiler, particularly a superheater tube, and a boiler corrosion suppression method.

  As a conventional boiler, there is a boiler that burns fuel in a combustion furnace and superheats the steam in the superheater by the heat of combustion or the heat of the combustion exhaust gas, thereby generating high-temperature and high-pressure superheated steam. . This superheated steam can be used for power generation.

Here, in recent years, from the viewpoint of CO ₂ reduction and waste heat utilization, it is possible to use, for example, biomass such as construction waste wood and waste such as waste tires and plastic as fuel for boilers. It is being advanced.

In such biomass fuel and waste fuel, the fuel contains salts such as Na, K, Cl, and heavy metals such as lead and zinc. Therefore, due to combustion in the combustion furnace, for example, some of KCl, NaCl, ZnCl ₂ , K ₂ SO ₄ , Na ₂ SO _4, etc. are combined to form a low melting point (about 300 ° C.) molten salt (both Crystal salt) is produced, and such molten salt flows to the superheater on the downstream side together with the combustion ash. Since the superheater generates high-temperature and high-pressure steam used for the power generation, the gas temperature is set higher than the melting point of the molten salt. Therefore, the molten salt produced by combining some of KCl, NaCl, ZnCl ₂ , K ₂ SO ₄ , Na ₂ SO _4, etc., forms a superheater tube that constitutes a high-temperature superheater of 300 ° C. or higher. Adhering to the surface causes the problem that the superheater tube corrodes.

  Next, an example of a conventional boiler corrosion prevention method for solving the problem that the superheater tube corrodes in this way will be described (for example, see Patent Document 1).

  In this boiler corrosion prevention method, a predetermined amount of predetermined particles (corrosion prevention particles) are supplied into a combustion furnace, and the corrosion prevention particles are converted into molten salt particles (molten salt particles) generated in the combustion furnace. ). By this mixing, the molten salt particles are well dispersed so that the surface of the molten salt particles is surrounded by the corrosion preventing particles, and the molten salt particles can be diluted with the corrosion preventing particles. Since the diluted molten salt particles adhere to the surface of the superheater tube on the downstream side, the concentration and the contact area of the molten salt particles adhering to the surface of the superheater tube are reduced by the corrosion preventing particles. can do. This is to suppress the corrosion of the superheater tube.

  The corrosion preventing particles have a melting point higher than the combustion temperature of the combustion furnace, do not melt in the vicinity of the combustion furnace and the superheater, and have a chlorine concentration, Na concentration, K concentration, and heavy metal concentration of 1000 ppm or less, respectively. Therefore, it contains almost no molten salt component.

  And the average particle diameter of a corrosion prevention particle is prescribed | regulated to 10-20 micrometers. The average particle diameter is defined in this way because when the average particle diameter exceeds 20 μm, the corrosion prevention particles are too large and the molten salt particles are difficult to be surrounded by the corrosion prevention particles, and the corrosion prevention particles are placed in the superheater tube. It becomes difficult to adhere. In addition, if the average particle size of the corrosion prevention particles is smaller than 10 μm, the corrosion prevention particles are too small to get on the combustion exhaust gas flow and go around the superheater tube, and it is difficult for the corrosion prevention particles to adhere to the superheater tube. ing.

JP 2006-308179 A

  However, the conventional boiler corrosion prevention method attempts to suppress corrosion of the superheater tube by reducing the concentration and contact area of the molten salt particles adhering to the surface of the superheater tube with the corrosion prevention particles. However, it is unclear how much corrosion prevention particles should be supplied into the combustion furnace in order to effectively suppress the corrosion of the superheater tube.

  Therefore, if the supply amount of the corrosion prevention particles into the combustion furnace is excessive, the cost of the corrosion prevention particles increases, and the cost for treating the combustion ash containing the corrosion prevention particles also increases. And when the supply amount of the corrosion prevention particles into the combustion furnace is insufficient, the corrosion of the superheater tube cannot be effectively suppressed.

  Further, even if the corrosion prevention particles are supplied into the combustion furnace, it is necessary to supply the corrosion prevention particles into the combustion furnace so that the corrosion prevention particles and the molten salt particles are sufficiently mixed with each other. There is no disclosure of such a supply method.

  The present invention has been made in order to solve the above-described problems, and can effectively suppress corrosion of the superheater tube and can reduce the amount of corrosion-inhibiting particles used. It aims at providing the boiler with an apparatus and the corrosion control method of a boiler.

A boiler with a corrosion suppression apparatus according to an aspect of the present invention is an exhaust gas passage through which combustion exhaust gas passes, a superheater pipe provided in the exhaust gas passage, and a corrosion suppressor for the superheater pipe caused by molten salt . In a boiler with a corrosion inhibiting device comprising a corrosion inhibiting device, a plurality of portions dispersed in the exhaust gas passage cross section of the space in which the superheater tube in the exhaust gas passage is installed or in the exhaust gas passage cross section of the superheater tube A plurality of corrosion sensors that detect the degree of corrosion of each of the plurality of dispersed parts and generate a detection signal corresponding to the degree of corrosion , wherein the flow direction of the flue gas in the vicinity of each of the plurality of parts of said plurality of corrosion sensors including corrosion sensor provided on the upstream side position, a plurality of than the superheater pipes is provided on the upstream side of the flow of the combustion exhaust gas Corrosion of the superheater tube is suppressed by adhering to the surface of the superheater tube having a particle diameter of 0.1 μm or more and less than 10 μm provided in each of the inlet and the plurality of blowing ports. It has a particle supply part for supplying corrosion-inhibiting particles, and a desired weight of corrosion-inhibiting particles can be blown into the exhaust gas passage from one or more desired blowing ports among the plurality of blowing ports. Based on the particle supply device and the detection signals generated by the plurality of corrosion sensors, the plurality of portions can be supplied with corrosion-inhibiting particles having a weight corresponding to the degree of corrosion in each portion. And a control unit for controlling the particle supply device.

  According to the boiler with the corrosion suppressing device according to the present invention, the plurality of corrosion sensors detect the degree of corrosion at each of the plurality of portions of the superheater tube and generate a detection signal corresponding to the degree of corrosion. Can do. The particle supply device blows the corrosion-inhibiting particles into the exhaust gas passage from one or more of the plurality of blowing ports provided on the upstream side of the flow of the combustion exhaust gas from the superheater tube. be able to. In addition, the control unit controls the corrosion of each portion of the superheater tube based on the plurality of detection signals generated by the plurality of corrosion sensors and corresponding to the degree of corrosion in each portion. The particle supply device can be controlled so that the particles can be supplied.

  Therefore, for example, since a drift occurs in the flow of combustion exhaust gas containing corrosive particles in the exhaust gas passage, even if a part of the superheater tube may be locally corroded, A large weight of the corrosion-inhibiting particles corresponding to the degree of corrosion at that part can be supplied. Then, for the portion of the superheater tube where the degree of corrosion is small, the corrosion-inhibiting particles having a small weight corresponding to the degree of corrosion in that portion can be supplied.

In the boiler with a corrosion suppressing apparatus according to another aspect of the present invention, the exhaust gas passage through which the combustion exhaust gas passes, the superheater tube provided in the exhaust gas passage, and the corrosion of the superheater tube by molten salt are suppressed. In the boiler with a corrosion suppression device for the above, the corrosion suppression device includes a plurality of parts dispersed in the cross section of the exhaust gas passage in the space where the superheater pipe in the exhaust gas passage is installed, or the overheating Corrosion that detects the concentration of corrosive particles and / or corrosive gas in each flue gas dispersed in the exhaust gas passage cross section of the pipe and generates a detection signal corresponding to the concentration a sensor, the plurality of corrosion, including corrosion sensor provided upstream position in the flow direction of the combustion exhaust gas in each vicinity of the plurality of partial And capacitors, a plurality of blowing port provided on the upstream side of the flow of the superheater combustion exhaust gas than tube, and said provided plurality each blow port, the particle diameter of 0.1μm or more 10μm A particle supply unit that supplies corrosion-suppressing particles that are less than the surface of the superheater tube and suppress corrosion of the superheater tube, and one or more of the plurality of blowing ports Each of the plurality of portions based on the detection signal generated by the plurality of corrosion sensors, and the particle supply device capable of blowing the corrosion-inhibiting particles having a desired weight into the exhaust gas passage from the desired blowing port. On the other hand, a control unit for controlling the particle supply device is provided so that corrosion-inhibiting particles having a weight corresponding to the concentration at each portion can be supplied.

  According to the boiler with a corrosion suppressing device according to the present invention, the plurality of corrosion sensors detect the concentration of corrosive particles and / or corrosive gas in the flue gas in each of a plurality of portions of the superheater tube, A detection signal corresponding to the concentration can be generated. The particle supply device has a desired weight in the exhaust gas passage from one or two or more desired injection ports among the plurality of injection ports provided on the upstream side of the flow of the combustion exhaust gas from the superheater tube. Corrosion inhibiting particles can be blown. In addition, the control unit, for each of the plurality of portions of the superheater tube, based on the plurality of detection signals generated by the plurality of corrosion sensors, corrosive particles and / or corrosive gas at each portion. The particle supply device can be controlled so that the corrosion-inhibiting particles having a weight corresponding to the concentration of can be supplied.

  In the boiler with a corrosion suppressing device according to the present invention, the control unit is a portion of the plurality of portions where the degree of corrosion of the superheater tube is larger than other portions, or corrosive particles and / or corrosive gas. It is preferable to control the particle supply device so that the weight of the corrosion-inhibiting particles supplied to the part is higher than that of the other part in the part where the concentration of the is higher than the other part.

  If it does in this way, corrosion in each part of a plurality of superheater tubes can be controlled effectively.

In the above-described boiler with a corrosion inhibitor, the plurality of corrosion sensors include a plurality of first corrosion sensors provided on the upstream side of the flow of the combustion exhaust gas from the plurality of injection ports, and the plurality of injections. A plurality of second corrosion sensors provided on the downstream side of the flow of the combustion exhaust gas from the mouth, wherein the plurality of first corrosion sensors corresponds to the degree of corrosion corresponding to the degree of corrosion of each of the excess portions. Is generated at a predetermined position, and generates a first detection signal corresponding to the corresponding degree of corrosion. The control unit generates a plurality of the first detection signals generated by the plurality of first corrosion sensors. The corrosion inhibiting particles of the plurality of blowing openings are supplied to each of the plurality of portions so that the corrosion inhibiting particles having a weight corresponding to the degree of corrosion in each portion can be supplied. 1 blowing weight The first blowing weight is adjusted based on the second detection signal generated by the second corrosion sensor, and the corrosion inhibiting particles having the first blowing weight adjusted from the plurality of blowing ports are provided. The particle supply device may be controlled so as to be blown.

  In this way, the plurality of first corrosion sensors detect the degree of corrosion at each of the plurality of portions of the superheater tube and the degree of corrosion corresponding thereto, and the first detection according to the corresponding degree of corrosion. A signal can be generated. Based on the plurality of first detection signals generated by the plurality of first corrosion sensors, the control unit applies a weight corresponding to the degree of corrosion at each portion to the plurality of portions of the superheater tube. The particle supply device can be controlled so that the corrosion-inhibiting particles can be supplied.

In the above-described boiler with a corrosion inhibitor, the plurality of corrosion sensors include a plurality of first corrosion sensors provided on the upstream side of the flow of the combustion exhaust gas from the plurality of injection ports, and the plurality of injections. A plurality of second corrosion sensors provided on the downstream side of the flow of the combustion exhaust gas from the mouth, wherein the plurality of first corrosion sensors are corrosive particles or corrosiveness in each of the plurality of portions of the combustion exhaust gas. Provided at a predetermined position where the concentration corresponding to the concentration of the gas or both of them can be detected, generates a first detection signal corresponding to the corresponding concentration, and the control unit generates a plurality of the plurality of first corrosion sensors. On the basis of the first detection signal of each of the plurality of portions, the corrosion-inhibiting particles having a weight corresponding to the concentration of corrosive particles and / or corrosive gas in each portion are provided for each of the plurality of portions. The first blowing weight of the corrosion-inhibiting particles at the plurality of blowing ports is set so that the first blowing weight is adjusted based on a second detection signal generated by the second corrosion sensor. And it is good to control the said particle | grain supply apparatus so that the corrosion suppression particle | grains of the said 1st blowing weight adjusted from the said several blowing inlet may be blown.

  In this way, the plurality of first corrosion sensors detect concentrations corresponding to the concentrations of corrosive particles and / or corrosive gases in the flue gas in the respective portions of the superheater tube, and A first detection signal corresponding to the corresponding concentration can be generated. Based on the plurality of first detection signals generated by the plurality of first corrosion sensors, the control unit performs corrosive particles or corrosive gas in each portion on the plurality of portions of the superheater tube. The particle feeder can be controlled so that both concentrations and corresponding weights of corrosion-inhibiting particles can be fed.

A method for inhibiting corrosion of a boiler according to an aspect of the present invention is provided for suppressing corrosion of an exhaust gas passage through which combustion exhaust gas passes, a superheater tube provided in the exhaust gas passage, and corrosion of the superheater tube by molten salt . A corrosion control device, wherein the corrosion control device includes a corrosion sensor, a particle supply device, and a control unit. In the method for controlling corrosion of a boiler, a plurality of corrosion sensors are installed in the superheater pipe in the exhaust gas passage. and detects the degree of each of the corrosion of said plurality of parts distributed in the exhaust gas passage section of the exhaust gas passage a plurality of portions or the superheater tubes dispersed in the cross section of the space, the corresponding detection signal and the degree of corrosion 1 or 2 or more desired inlets among the plurality of inlets provided on the upstream side of the flow of the combustion exhaust gas from the superheater tube. In the exhaust gas passage, a desired weight of corrosion-inhibiting particles that have a particle diameter of 0.1 μm or more and less than 10 μm and adhere to the surface of the superheater tube to suppress corrosion of the superheater tube can be blown into the exhaust gas passage. The control unit supplies corrosion inhibiting particles having a weight corresponding to the degree of corrosion in each portion to each of the plurality of portions based on the detection signals generated by the plurality of corrosion sensors. The particle supply device is controlled so as to be able to do so.

  According to the method for inhibiting corrosion of a boiler according to the present invention, the same operation as that of the boiler with a corrosion inhibiting device according to the first aspect of the present invention can be achieved.

A method for inhibiting corrosion of a boiler according to another aspect of the present invention includes suppressing an exhaust gas passage through which combustion exhaust gas passes, a superheater tube provided in the exhaust gas passage, and corrosion of the superheater tube by molten salt. And a corrosion control method for a boiler having a corrosion sensor, a particle supply device, and a controller, wherein the corrosion sensor is installed in the superheater pipe in the exhaust gas passage. each corrosive particles or corrosive gases or concentration of both the combustion exhaust gas of the exhaust gas channel plurality of moieties distributed in the cross section portion or portions dispersed in the flue gas passage section of the superheater tube space being And a detection signal corresponding to the concentration is generated, and the particle supply device is provided with a plurality of blowers provided upstream of the superheater tube in the flow of the combustion exhaust gas. The detection signal generated by the plurality of corrosion sensors can be produced by blowing a desired weight of corrosion-inhibiting particles into the exhaust gas passage from one or more desired inlets of the outlets. And controlling the particle supply device so that the corrosion-inhibiting particles having a weight corresponding to the concentration at each portion can be supplied to each of the plurality of portions. It is.

  According to the method for inhibiting corrosion of a boiler according to the present invention, the same operation as that of the boiler with a corrosion inhibiting apparatus according to the second present invention can be achieved.

According to the boiler with a corrosion inhibiting device and the method for inhibiting corrosion of a boiler according to the present invention, the degree of corrosion in each part, or corrosive particles or each of the plurality of parts dispersed in the cross section of the exhaust gas passage of the superheater pipe Since the corrosion-inhibiting particles having a weight corresponding to the concentration of the corrosive gas or both can be supplied, the corrosion of the superheater tube can be effectively suppressed and the amount of the corrosion-inhibiting particles used can be reduced. Can be reduced. As a result, the cost for the corrosion-inhibiting particles and the cost for treating the combustion ash containing the corrosion-inhibiting particles can be reduced.

It is a schematic perspective view which shows the internal structure of the boiler with a corrosion inhibitor which concerns on 1st Embodiment of this invention. It is a schematic cross section which shows the internal structure of the boiler with a corrosion inhibitor shown in FIG. It is a general | schematic partial expansion perspective view which shows the internal structure of the boiler with a corrosion inhibitor shown in FIG. It is a block diagram which shows the control structure of the boiler which concerns on the 1st Embodiment. It is a block diagram which shows the control structure of the boiler which concerns on 2nd and 3rd embodiment of the same invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a first embodiment of a boiler 19 with a corrosion inhibiting device and a boiler corrosion inhibiting method according to the present invention will be described with reference to FIGS. 1 and FIG. 2, a boiler with a corrosion inhibitor (hereinafter sometimes simply referred to as “boiler”) 19 burns fuel in a combustion furnace 10, and combustion heat and combustion exhaust gas generated by the combustion are generated. The steam in the superheater tube 27 is superheated by the heat it has, and high-temperature and high-pressure superheated steam can be generated.

  The boiler 19 is provided with a corrosion suppression device 59. The corrosion suppression device 59 blows corrosion suppression particles into the second flue 21, thereby providing a superheater provided on the downstream side. Corrosion of the tube 27 can be suppressed. The boiler 19 is an exhaust heat boiler that uses, for example, a waste incinerator as the combustion furnace 10, and further generates power using high-temperature and high-pressure superheated steam obtained through the superheater tube 27. Machine 11 is provided.

  The garbage incinerator (combustion furnace) 10 is provided with a hopper 12 for supplying garbage as shown in FIGS. The hopper 12 is connected to the main combustion chamber 14 via the chute 13, and the dust supplied from the hopper 12 is sent to the main combustion chamber 14 through the chute 13. The main combustion chamber 14 is provided with a dry stoker 15, a combustion stoker 16, and a post-combustion stoker 17. Primary air is sent from below the stokers 15, 16, and 17, and secondary air is sent from the ceiling 14 a of the main combustion chamber 14.

  The garbage in the main combustion chamber 14 shown in FIG. 1 is first sent to the drying stoker 15 and dried and ignited by the primary air and the radiant heat of the main combustion chamber 14. The ignited garbage is sent to the combustion stoker 16. In addition, combustible gas is generated from the ignited garbage by pyrolysis. This combustible gas is sent to the gas layer above the main combustion chamber 14 by the primary air, and flame burns with the secondary air in this gas layer. The temperature of the dust is further increased by the heat radiation accompanying the flame combustion. A part of the ignited garbage is combusted by the combustion stoker 16, and the remaining unburned portion is sent to the post-combustion stoker 17. Unburned waste is burned by the post-combustion stoker 17, and the incineration ash remaining after the combustion is discharged from the chute 18 to the outside.

  Further, as shown in FIG. 1, the main combustion chamber 14 is connected to a radiation chamber 20 provided in the boiler 19, and combustion exhaust gas generated by combustion of garbage is transferred from the main combustion chamber 14 to the radiation chamber 20. Will be sent. This combustion exhaust gas is guided to the third flue 22 through the second flue 21 of the boiler 19 and then discharged to the atmosphere after being detoxified by an exhaust gas treatment facility (not shown).

  The boiler 19 shown in FIG. 1 is provided with a plurality of water pipes 23 connected to a boiler drum 24 on each of walls defining the radiation chamber 20 and the second flue 21. The water pipe 23 is formed of, for example, carbon steel (for example, STB340), and water sent from the boiler drum 24 flows therein. The water in the water pipe 23 recovers the waste heat of the first or second flue 20, 21, part of which evaporates and becomes brackish water and is returned to the boiler drum 24. A part of the brackish water returning to the boiler drum 24 is vaporized to become steam. The steam is sent from the boiler drum 24 to a superheater 25 provided in the third flue 22 to be superheated. The superheated steam that has been heated up to high temperature and high pressure is sent to the turbine 26 and drives the generator 11.

  According to the boiler 19 configured as described above, components evaporated during combustion and part of the incineration ash soared by the combustion exhaust gas are conveyed to the radiation chamber 20, the second flue 21, and the third flue 22. And deposits on the water tube 23 and the superheater tube 27 of the superheater 25. Incinerated ash contains a molten salt having high corrosiveness, and is a factor that corrodes the superheater tube 27 of the high-temperature superheater 25.

  Next, the corrosion inhibitor 59 will be described. This corrosion suppression device 59 is a device for suppressing the corrosion of the superheater tube 27 shown in FIG. 1, and includes a plurality of corrosion sensors 31 (31a, 31b, 31c, 31d), a particle supply device 60, and a control unit. 100.

  As shown in FIG. 3, the corrosion sensor 31 is provided on the side wall of the third flue 22 of the boiler 19 and on the upstream side of the superheater 25 in the flow direction of the combustion exhaust gas. Located in 3 flues 22. Although not shown, the corrosion sensor 31 has a pair of electrodes provided in the third flue 22 and detects the degree of corrosion of the superheater tube 27 based on a change in electrical resistance between the pair of electrodes. Thus, a corrosion detection signal corresponding to the degree of corrosion is generated.

  The corrosion sensor 31 is preferably provided in the vicinity of the superheater tube 27 group having the most severe corrosion (the highest steam temperature) in the superheater 25.

  Further, for example, as shown in FIG. 3, the corrosion sensors 31 a to 31 d are distributed in a total of four at a position close to the four corners of the third flue 22 having a rectangular cross section. Yes. Since the corrosion sensors 31a to 31d are distributed in this way, a plurality of respective portions A2, B2, C2, D2, E2, and F2 of the space (corrosion environment) in which the superheater tube 27 is installed are provided. ,... Can be detected, and a corrosion detection signal corresponding to the degree of corrosion can be generated.

  That is, for example, the flow of corrosive particles and corrosive gas (hereinafter also simply referred to as “corrosive particles”) contained in the combustion exhaust gas indicated by an arrow 61 in FIG. When the flow is biased to a part (for example, the part A1) of the parts A1, B1, C1, D1, E1, F1,..., The value of the corrosion detection signal generated by the corrosion sensor 31a is large. The value of the corrosion detection signal generated by the sensors 31b, 31c, 31d is a smaller value. And when the flow of corrosive particles is biased toward the portion A1 in the third flue 22 in this way, the corrosion of the portion A2 of the superheater tube 27 located downstream of the flow of corrosive particles. The rate of progress of corrosion increases, and the rate of progress of corrosion in other parts becomes smaller.

  As described above, the corrosion sensors 31a to 31d are used to prevent corrosion at a plurality of portions A2, B2, C2, D2, E2, F2,... Of the space (corrosion environment) where the superheater tube 27 is installed. The degree can be detected, and a corrosion detection signal corresponding to the degree of corrosion can be generated.

  However, although the example which provided four corrosion sensors 31a-31d was shown, you may provide several corrosion sensors other than four.

  And the corrosion sensors 31a to 31d indicate the degree of corrosion in each of the plurality of portions A2, B2, C2, D2, E2, F2,... Of the space (corrosion environment) where the superheater tube 27 is installed. However, instead of this, the degree of corrosion at each of a plurality of portions of the superheater tube 27 itself may be directly detected.

  For example, as shown in FIG. 3, the particle supply device 60 includes six blowing ports 59 a to 59 f through which corrosion-inhibiting particles can be blown. The six blowing ports 59a to 59f are provided three by three on the side wall portions that are provided facing each other and form the second flue 21 having a rectangular cross section. And the particle | grain supply apparatus 60 can blow in the 2nd flue 21 the corrosion suppression particle | grains of a desired weight from the 1 or 2 or more desired blowing port of these six blowing ports 59a-59f. It is configured. And each of these six blowing ports 59a-59f is provided with the 1st-6th particle | grain supply parts 60a-60f shown in FIG. These first to sixth particle supply units 60a to 60f are, for example, particle supply feeders.

  However, although the example which provided six blowing ports 59a-59f was shown, a plurality of blowing ports other than six may be provided, and a particle supply unit may be provided for each of these blowing ports.

  Based on the four respective corrosion detection signals generated by the four corrosion sensors 31a to 31d, the control unit 100 performs a plurality of respective portions A2, B2, C2, D2, E2, F2,. On the other hand, the particle supply device 60 is controlled so that corrosion-inhibiting particles having a weight corresponding to the degree of corrosion at each portion can be supplied. These control unit 100, corrosion sensors 31a to 31d, and first to sixth particle supply units 60a to 60f (particle supply device 60) are electrically connected as shown in the block diagram of FIG.

  That is, as described above, for example, when the flow of corrosive particles contained in the combustion exhaust gas indicated by the arrow 61 in FIG. 3 is biased to a part (for example, A1 part) in the third flue 22, A flow having a correlation with the flow also occurs in the portion where the six air inlets 59a to 59f in the second flue 21 are provided. Therefore, the control unit 100 controls the first to sixth particle supply units 60a to 60f (particle supply device 60) based on the four corrosion detection signals generated by the four corrosion sensors 31a to 31d, and By blowing a predetermined weight of corrosion-inhibiting particles into the second flue 21 from one or more predetermined ones of the two inlets 59a to 59f, a plurality of respective portions A2 of the superheater tube 27 , B2, C2, D2, E2, F2,... Can be supplied with corrosion-inhibiting particles having a weight corresponding to the degree of corrosion at each portion.

  However, the first to sixth particle supply units 60a to 60f (particle supply device 60) are controlled based on the four corrosion detection signals generated by the four corrosion sensors 31a to 31d, and the six inlets 59a are controlled. It has been elucidated in advance by experiments and simulations that the corrosion-inhibiting particles having a predetermined weight are blown into the second flue 21 from one or more predetermined blowing ports of ~ 59f. 100 is recorded in a storage unit provided in 100. Therefore, the control part 100 controls the 1st-6th particle supply parts 60a-60f (particle supply apparatus 60) according to the program memorize | stored in this memory | storage part.

Next, the corrosion inhibiting particles will be described. The corrosion-inhibiting particles are particles having a particle size of 0.1 μm or more and less than 10 μm, and are compounds containing at least one element of Ca, Si, Al, Mg, and Fe as a main component, for example, CaO, SiO ₂ It is. Furthermore, specific examples of the corrosion inhibiting particles include silica sand, diatomaceous earth, dolomite, and zeolite.

  The corrosion inhibiting particles have a melting point of 800 ° C. or higher. The region where the particle supply device 60 blows the corrosion-inhibiting particles is a region where the corrosion-inhibiting particles are not melted by the combustion exhaust gas in the region where the corrosion-inhibiting particles are blown. That is, in this embodiment, the corrosion-inhibiting particles are blown into the second flue 21, and the second flue 21 is a region where the gas temperature of the combustion exhaust gas flowing inside thereof is lower than 800 ° C. .

  Furthermore, in this embodiment, the corrosion-inhibiting particles are mixed with a slurry-like mixed material obtained by mixing the corrosion-inhibiting particles with water, or powder (for example, incinerated ash) having a particle diameter larger than that of the corrosion-inhibiting particles. The obtained powdery mixed substance is blown into the second flue 21 using the particle supply device 60.

  Next, the operation of the boiler 19 with a corrosion inhibitor configured as described above will be described. According to the boiler 19 with a corrosion inhibiting device according to this embodiment, for example, the four corrosion sensors 31a to 31d shown in FIG. 3 include a plurality of respective portions A2 of the space (corrosion environment) in which the superheater pipe 27 is installed, The degree of corrosion at B2, C2, D2, E2, F2,... Can be detected, and a corrosion detection signal corresponding to the degree of corrosion can be generated.

  And the particle | grain supply apparatus 60 is the 2nd smoke from 1 or 2 or more of the 6 inlets 59a-59f provided in the upstream of the flow of combustion exhaust gas rather than the superheater pipe | tube 27, for example. Corrosion inhibiting particles can be blown into the road 21.

  Moreover, the control part 100 is based on each four corrosion detection signals which the four corrosion sensors 31a-31d generate | occur | produce, several each part A2, B2, C2, D2, E2, F2, of the superheater pipe | tube 27, ..., the particle supply device 60 can be controlled so that the corrosion-inhibiting particles having a weight corresponding to the degree of corrosion at each portion can be supplied.

  Therefore, for example, since a drift has occurred in the flow of the combustion exhaust gas containing corrosive particles in the second and third flues 21 and 22 (exhaust gas passages), a part of the superheater tube 27 (parts A2, B2, C2, D2, E2, F2,...) May have a locally high degree of corrosion, but the part has a large weight corresponding to the degree of corrosion in that part. Corrosion inhibiting particles can be supplied. And the corrosion suppression particle | grains of the small weight corresponding to the degree of the corrosion in the part can be supplied with respect to the part with the small degree of corrosion of the superheater pipe | tube 27. FIG.

  In this way, the corrosion-suppressing particles having a weight corresponding to the degree of corrosion in the portions A2, B2, C2, D2, E2, F2,. Therefore, corrosion of the other part of the superheater tube 27 provided on the downstream side can also be suppressed.

  Therefore, corrosion of the superheater tube 27 can be effectively suppressed, and the amount of corrosion-inhibiting particles used can be reduced. As a result, the cost for the corrosion-inhibiting particles and the cost for treating the combustion ash containing the corrosion-inhibiting particles can be reduced.

  As shown in FIG. 3, the four corrosion sensors 31a to 31d are provided in the vicinity of the plurality of portions A2, B2, C2, and D2 of the superheater tube 27 and at the upstream positions thereof. The degree of corrosion at each of the plurality of portions A2, B2, C2, D2, E2, F2,... Of the superheater tube 27 can be accurately detected by the corrosion sensors 31a to 31d.

  Next, a second embodiment of the boiler with a corrosion inhibitor and the boiler corrosion suppression method according to the present invention will be described with reference to FIGS. 3 and 5. As shown in FIG. 3, this boiler with a corrosion suppression device has, as a corrosion sensor 31, one or two or more, for example, provided in the radiation chamber 20 on the upstream side of the flow of the combustion exhaust gas from the inlets 59 a to 59 f. There are four first corrosion sensors 31e to 31h and a plurality of second corrosion sensors 31a to 31d provided in the third flue 22 on the downstream side of the flow of the combustion exhaust gas from the inlets 59a to 59f. ing. These first and second corrosion sensors 31e to 31h and 31a to 31d are equivalent to those of the first embodiment.

  The control unit 100 controls the particle supply device 60 based on the first corrosion detection signals generated by the first corrosion sensors 31e to 31h, so that the corrosion-inhibiting particles blown from one or two or more blowing ports 59a to 59f are controlled. The first blowing weight is set, and the particle feeding device 60 is controlled based on the second corrosion detection signals generated by the second corrosion sensors 31a to 31d to adjust the first blowing weight of the corrosion-inhibiting particles ( Correction).

  Other than this, the second embodiment is the same as the first embodiment, and a detailed description of the equivalent parts is omitted.

  If it does in this way, the control part 100 will control the particle supply apparatus 60 based on the 1st corrosion detection signal which the 1st corrosion sensors 31e-31h generate | occur | produce, and will set the 1st blowing weight of a corrosion suppression particle | grain. Can do.

  In other words, it is possible to detect the degree of corrosion based on the corrosive particles and the corrosive gas in the state before the corrosion-inhibiting particles are mixed with the combustion exhaust gas containing the corrosive particles and the corrosive gas, and It is possible to obtain the absolute weight (first blowing weight) of each of the corrosion-inhibiting particles that needs to be blown from 59a to 59f, and the corrosion of the superheater tube 27 can be effectively suppressed.

  Then, as described in the first embodiment, the control unit 100 determines each part A2, B2, C2, D2 of the superheater tube 27 based on the second corrosion detection signal generated by the second corrosion sensors 31a to 31d. , E2, F2,..., For example, corrosion at each part A2, B2, C2, D2, E2, F2,. The first blowing weight of each of the corrosion-inhibiting particles blown from one or two or more blowing ports 59a to 59f can be adjusted (corrected) so that the target corrosion progressing speed can be suppressed.

  Next, a third embodiment of the boiler with a corrosion inhibitor and the boiler corrosion suppression method according to the present invention will be described with reference to FIGS. 3 and 5. As shown in FIG. 3, the boiler with the corrosion suppressing device includes, for example, four first corrosion sensors 31 e to 31 h in a plurality of respective portions A <b> 2 and B <b> 2 of a space (corrosive environment) in which the superheater pipe 27 is installed. , C2, D2, E2, F2,... Are provided at predetermined positions where the degree of corrosion and the corresponding degree of corrosion can be detected, and a corrosion detection signal corresponding to the corresponding degree of corrosion can be generated. It is provided as follows.

  That is, for example, when the flow of corrosive particles and corrosive gas included in the combustion exhaust gas indicated by the arrow 61 in FIG. 3 is biased to a part (for example, the portion A1) in the third flue 22, A flow having a correlation with the flow also occurs in the portion where the four first corrosion sensors 31e to 31h in the radiation chamber 20 are provided.

  The control unit 100 controls the first to sixth particle supply units 60a to 60f (particle supply device 60) based on the four first corrosion detection signals generated by the four first corrosion sensors 31e to 31h. By blowing a predetermined weight (first blowing weight) of the corrosion-inhibiting particles into the second flue 21 from one or more of the six blowing holes 59a to 59f, the superheater To each of the plurality of portions A2, B2, C2, D2, E2, F2,... Of the tube 27, corrosion inhibiting particles having a weight corresponding to the degree of corrosion at each portion can be supplied.

  Other than this, the second embodiment is the same as the second embodiment, and a detailed description of the equivalent parts is omitted.

  According to this boiler or the like with a corrosion inhibiting device, the four first corrosion sensors 31e to 31h are provided with a plurality of respective portions A2, B2, C2, D2, E2 of the space (corrosion environment) where the superheater pipe 27 is installed. , F2,... Can be detected and a corresponding corrosion level can be detected to generate a first corrosion detection signal corresponding to the corresponding corrosion level.

  And the control part 100 is based on each 4th 1st corrosion detection signal which 4 1st corrosion sensors 31e-31h generate | occur | produce, and each some part A2, B2, C2, D2, of the superheater pipe | tube 27, The particle supply device 60 can be controlled so that the corrosion-inhibiting particles having a weight corresponding to the degree of corrosion at each portion can be supplied to E2, F2,.

  Next, the action of the corrosion inhibiting particles will be described. As the corrosion-inhibiting particles, particles having a particle diameter of 0.1 μm or more and less than 10 μm are used.

  In this way, by blowing the corrosion-inhibiting particles having a particle diameter of 0.1 μm or more and less than 10 μm into, for example, the second flue 21, the blown corrosion-inhibiting particles are heated against the metal interface of the superheater tube 27. It can be attached by electrophoresis or inertial collision. As a result, the corrosive particles having a particle diameter of 0.1 to 10 μm scattered in the exhaust gas passage can reduce the adhesion weight and adhesion area adhering to the metal interface or the like of the superheater tube 27, and the superheater tube 27. The progress of corrosion can be suppressed.

  Hereinafter, a mechanism capable of suppressing the progress of corrosion of the superheater tube 27 by blowing the corrosion-inhibiting particles having a particle size of 0.1 μm or more and less than 10 μm into, for example, the second flue 21 will be described.

  The inventor of the present application has a particle diameter of 0.1 to 10 μm scattered in the third flue 22 of the boiler 19 shown in FIG. 1, and corrosion containing Na or K chloride (for example, NaCl, KCl). It has been found that the corrosion of the superheater tube 27 proceeds by the adhering particles (molten salt particles as the oxidizing agent) adhering to the surface of the superheater tube 27 provided in the third flue 22.

  Therefore, the combustion ash is produced by blowing the corrosion-inhibiting particles having the same particle size (0.1 μm or more and less than 10 μm) as the corrosive particles, for example, into the second flue 21 and adhering to the surface of the superheater tube 27. The corrosion weight of the superheater tube 27 is reduced by reducing the adhesion weight and the adhesion area of the corrosive particles having a particle diameter of 0.1 to 10 μm contained in the surface of the superheater tube 27. did.

Furthermore, the corrosion inhibition mechanism by the corrosion inhibition particles will be described in detail.
(1) Corrosive particles having a particle size of 0.1 to 2 μm Corrosive particles having a particle size of 0.1 to 2 μm adhere to the metal interface of the superheater tube 27 mainly by thermophoresis. And among the particles scattered in the third flue 22, there are many particles having a particle diameter of 0.1 to 2 μm centered on the corrosive particles containing Na or K chloride, The corrosive particles have a high corrosive force.

  Therefore, corrosion occurs when these corrosive particles adhere to the metal interface of the superheater tube 27 or the like.

Therefore, according to the boiler 19 with the corrosion suppressing device of this embodiment, the corrosion suppressing device 59 (in FIG. 1, the blowing port 59a among the blowing ports 59a to 59f of the corrosion suppressing device 59 is shown). The corrosion suppression particles having a particle size of 0.1 μm or more and less than 10 μm are blown into the second flue 21, so that the blown corrosion suppression particles are superheated in the third flue 22. It can be attached to the metal interface of the vessel 27 by thermophoresis. As a result, the corrosive particles having a particle diameter of 0.1 to 2 μm in the third flue 22 can reduce the adhesion weight and adhesion area adhering to the metal interface of the superheater tube 27, and the superheater tube. The progress of the corrosion of 27 can be suppressed.
(2) Corrosive particles having a particle diameter of 2 to 10 μm Corrosive particles having a particle diameter of 2 to 10 μm may adhere to the metal interface of the superheater tube 27 by thermophoresis, but more than that. Many of them are mainly attached to the metal interface of the superheater tube 27 due to inertial collision.

  Of the particles (combustion ash) scattered in the third flue 22, the particles having a particle diameter of 2 to 10 μm contain more corrosion inhibiting particles than the corrosive particles containing Na or K chloride. Therefore, it can be said that the corrosive force with respect to the superheater tube 27 is smaller than that in the case (1).

Further, in order for the corrosion to proceed, it is necessary for the corrosive particles to continuously adhere to the metal interface of the superheater tube 27, etc., but using the particle supply device 60, the particle diameter is 0.1 μm or more. When corrosion-inhibiting particles of less than 10 μm are blown into the second flue 21 and the blown-in corrosion inhibiting particles adhere to the metal interface of the superheater tube 27 by inertial collision or thermophoresis, the superheater tube 27 It is possible to prevent the corrosive particles adhering to the metal interface or the like due to inertial collision or the like from diffusing and adhering to the metal interface of the superheater tube 27. Thereby, the progress of corrosion of the superheater tube 27 can be suppressed.
(3) Corrosion-inhibiting particles having a particle size of 10 μm or more (corrosion-inhibiting particles excluded from this embodiment)
Using the particle supply device 60, the corrosion-inhibiting particles having a particle diameter of 10 μm or more were blown into the second flue 21, so that the blown-in corrosion-inhibiting particles were adhered to the metal interface of the superheater tube 27. In this case, there is a high possibility that corrosive particles having a particle diameter of 0.1 to 10 μm enter from a gap between the corrosion-inhibiting particles having a particle diameter of 10 μm or more and adhere to the metal interface of the superheater tube 27. Therefore, when the corrosion-inhibiting particles having a particle diameter of 10 μm or more are used, the corrosion of the superheater tube 27 can hardly be suppressed.

  Therefore, in this embodiment, the corrosion inhibitor particles having the same particle size (0.1 μm or more and less than 10 μm) as the corrosive particles having a particle size of 0.1 to 10 μm are blown into the second flue 21 to be superheater. By adhering to the surface of the tube 27, the weight and area of 0.1 to 10 μm corrosive particles adhering to the surface of the superheater tube 27 are reduced, and the progress of corrosion of the superheater tube 27 is suppressed. I did it.

  However, in each of the above embodiments, each of the plurality of first and second corrosion sensors 31 shown in FIG. 3 has a plurality of respective portions A2, B2, C2 of the space (corrosion environment) in which the superheater tube 27 is installed. , D2, E2, F2,..., Detecting the degree of corrosion (or the degree of corrosion corresponding to the degree of corrosion) and corresponding to the degree of corrosion (or the degree of corrosion corresponding to the degree of corrosion) It is assumed that a corrosion detection signal (depending on the degree) is generated, and the control unit 100, based on a plurality of respective corrosion detection signals generated by the plurality of corrosion sensors 31, a plurality of respective portions A2, B2, C2, D2, E2, F2,... Are supplied with corrosion-inhibiting particles having a weight corresponding to the degree of corrosion at each part (or depending on the degree of corrosion and the corresponding degree of corrosion). Particle supply device 60 so that it can It is configured to control, instead of this, may be the following configuration.

  That is, the first and second corrosion sensors 31 shown in FIG. 3 are corrosive particles in the combustion exhaust gas at the plurality of portions A2, B2, C2, D2, E2, F2,. Alternatively, the concentration of the corrosive gas or both (or the concentration corresponding to the concentration) is detected, and a concentration detection signal corresponding to the concentration (or according to the concentration corresponding to the concentration) is generated, and the control unit 100 Is based on a plurality of respective concentration detection signals generated by the plurality of corrosion sensors 31 for a plurality of respective portions A2, B2, C2, D2, E2, F2,. In this configuration, the particle supply device 60 is controlled so that the weight of the corrosion-inhibiting particles corresponding to the concentration at each portion (or according to the concentration corresponding to the concentration) can be supplied.

  The corrosion sensor 31 is, for example, a particle concentration sensor, a gas concentration sensor, or a gas particle concentration sensor. This gas particle concentration sensor is a sensor that detects the concentration of both corrosive particles and corrosive gas.

  In this way, the plurality of first and second corrosion sensors 31 for detecting the concentration are combusted exhaust gas at the plurality of portions A2, B2, C2, D2, E2, F2,. The concentration (or concentration corresponding to the concentration) of the corrosive particles in the inside is detected, and a concentration detection signal corresponding to the concentration of the corrosive particles or the like (or according to the concentration corresponding to the concentration) is generated. be able to. And the particle supply apparatus 60 is 1 or 2 or more desired injecting ports among the some inflow nozzles 59a-59f provided in the upstream of the flow of combustion exhaust gas rather than the superheater pipe | tube 27, for example. From the above, a desired weight of corrosion inhibiting particles can be blown into the second flue 21. Moreover, the control part 100 is based on several each density | concentration detection signal which the some corrosion sensor 31 produces | generates several each part A2, B2, C2, D2, E2, F2,. In contrast, the particle supply device 60 is controlled so that corrosion-inhibiting particles having a weight corresponding to (or depending on the concentration corresponding to) the concentration of corrosive particles or the like in each portion can be supplied. can do.

  And like the said embodiment, as shown in FIG. 3, four corrosion sensors 31a-31d for density | concentration measurement, for example in the vicinity of each part A2, B2, C2, D2 of the superheater pipe | tube 27, are shown. By providing the upstream side position, the concentration of the corrosive particles or the like in the combustion exhaust gas at each of the plurality of portions A2, B2, C2, D2, E2, F2,. It can detect correctly by the corrosion sensors 31a-31d for density | concentration measurement.

  Further, by providing four second corrosion sensors 31a to 31d for concentration measurement, for example, in the vicinity of the plurality of portions A2, B2, C2, and D2 of the superheater tube 27 and at positions upstream thereof. Similarly to the case where the two second corrosion sensors 31a to 31d for corrosion measurement are provided, the control unit 100 determines each of the superheater tubes 27 based on the second concentration detection signal generated by the second corrosion sensors 31a to 31d. In order to effectively suppress corrosion in the parts A2, B2, C2, D2, E2, F2,..., For example, each part A2, B2, C2, D2, E2, etc. of the superheater tube 27, The blowing weight of each of the corrosion-inhibiting particles blown from one or two or more blowing ports 59a to 59f can be adjusted so that the corrosion at F2,. .

  As described above, the boiler with a corrosion inhibiting device and the method for inhibiting corrosion of a boiler according to the present invention can effectively inhibit corrosion of a superheater tube and reduce the amount of corrosion inhibiting particles used. It has an excellent effect and is suitable for application to such a boiler with a corrosion inhibitor and a method for inhibiting corrosion of a boiler.

10 Combustion furnace (garbage incinerator)
DESCRIPTION OF SYMBOLS 11 Generator 12 Hopper 13 Chute 14 Main combustion chamber 14a Ceiling 15 Dry stalker 16 Combustion stalker 17 Post combustion stalker 18 Chute 19 Boiler 20 Radiation chamber 21 Second flue 22 Third flue 23 Water pipe 24 Boiler drum 25 Superheater 26 Turbine 27 Superheater tube 31 Corrosion sensor 31a-31d 2nd corrosion sensor 31e-31h 1st corrosion sensor 59 Corrosion suppression apparatus 59a-59f Blowing inlet 60 Particle supply apparatus 60a-60f 1st-6th particle supply part 61 Arrow 100 Control Part

Claims (7)

In a boiler with a corrosion suppression device comprising an exhaust gas passage through which combustion exhaust gas passes, a superheater pipe provided in the exhaust gas passage, and a corrosion suppression device for suppressing corrosion of the superheater pipe due to molten salt ,
The corrosion inhibitor is
Detecting the degree of each of the corrosion of a plurality of parts that are dispersed in the flue gas passage section of a plurality of parts or the superheater tubes dispersed in the flue gas passage section of the space in which the superheater tubes in said exhaust gas passage is installed And a plurality of corrosion sensors that generate detection signals corresponding to the degree of corrosion , the corrosion sensors being provided at upstream positions in the flow direction of the combustion exhaust gas in the vicinity of each of the plurality of portions. Multiple corrosion sensors ,
The plurality of inlets provided on the upstream side of the flow of the combustion exhaust gas from the superheater tube, and the particle diameter provided in each of the plurality of inlets is 0.1 μm or more and less than 10 μm. A particle supply unit for supplying corrosion-suppressing particles that suppress corrosion of the superheater tube by adhering to the surface of the superheater tube, and one or more desired ones of the plurality of blowing ports A particle supplying device capable of blowing a desired weight of corrosion-inhibiting particles into the exhaust gas passage from the blowing port;
Based on the detection signals generated by the plurality of corrosion sensors, the particle supply is performed so that the corrosion-inhibiting particles having a weight corresponding to the degree of corrosion in each portion can be supplied to the plurality of portions. A boiler with a corrosion inhibitor, comprising: a controller that controls the apparatus. In a boiler with a corrosion suppression device comprising an exhaust gas passage through which combustion exhaust gas passes, a superheater pipe provided in the exhaust gas passage, and a corrosion suppression device for suppressing corrosion of the superheater pipe due to molten salt ,
The corrosion inhibitor is
Each corrosion in combustion exhaust gas of a plurality of portions or parts dispersed in the flue gas passage section of the superheater tubes the superheater tubes is dispersed in the flue gas passage section of the space being disposed in said exhaust gas channel A plurality of corrosion sensors that detect the concentration of the corrosive particles and / or the corrosive gas and generate a detection signal corresponding to the concentration , upstream of the flow direction of the combustion exhaust gas in the vicinity of each of the plurality of portions The plurality of corrosion sensors including a corrosion sensor provided at a side position ;
The plurality of inlets provided on the upstream side of the flow of the combustion exhaust gas from the superheater tube, and the particle diameter provided in each of the plurality of inlets is 0.1 μm or more and less than 10 μm. A particle supply unit for supplying corrosion-suppressing particles that suppress corrosion of the superheater tube by adhering to the surface of the superheater tube, and one or more desired ones of the plurality of blowing ports A particle supplying device capable of blowing a desired weight of corrosion-inhibiting particles into the exhaust gas passage from the blowing port;
Based on the detection signals generated by the plurality of corrosion sensors, the particles can be supplied to each of the plurality of portions with corrosion-inhibiting particles having a weight corresponding to the concentration at each portion. A boiler with a corrosion inhibitor, comprising: a controller that controls the supply device.   The controller may include a portion of the plurality of portions where the degree of corrosion of the superheater tube is greater than that of other portions, or a portion where the concentration of corrosive particles and / or corrosive gas is higher than the other portions. 3. The boiler with a corrosion suppression device according to claim 1 or 2, wherein the particle supply device is controlled so that the weight of the corrosion suppression particles supplied to the portion is larger than that of other portions. . The plurality of corrosion sensors include a plurality of first corrosion sensors provided on the upstream side of the flow of combustion exhaust gas with respect to the plurality of injection ports, and a downstream of the flow of combustion exhaust gas with respect to the plurality of injection ports. A plurality of second corrosion sensors provided on the side,
The plurality of first corrosion sensors are provided at predetermined positions where the degree of corrosion corresponding to the degree of corrosion of each of the plurality of portions can be detected, and generate a first detection signal corresponding to the corresponding degree of corrosion. ,
Based on the first detection signals generated by the plurality of first corrosion sensors, the control unit adds corrosion-inhibiting particles having a weight corresponding to the degree of corrosion in each portion to each of the plurality of portions. The first blowing weight of the corrosion-inhibiting particles of the plurality of blowing ports is set so that the first blowing weight can be supplied, and the first blowing weight is determined based on a second detection signal generated by the second corrosion sensor. The said particle | grain supply apparatus is controlled so that the corrosion inhibition particle | grains of the said 1st blowing weight adjusted and adjusted from these several blowing inlets may be blown in, The corrosion inhibitory apparatus of Claim 1 characterized by the above-mentioned. boiler. The plurality of corrosion sensors include a plurality of first corrosion sensors provided on the upstream side of the flow of combustion exhaust gas with respect to the plurality of injection ports, and a downstream of the flow of combustion exhaust gas with respect to the plurality of injection ports. A plurality of second corrosion sensors provided on the side,
The plurality of first corrosion sensors are provided at predetermined positions where the concentrations corresponding to the concentrations of the corrosive particles and / or the corrosive gas in the flue gas of each of the plurality of portions can be detected. A first detection signal is generated in response,
Based on the first detection signal generated by the plurality of first corrosion sensors, the control unit is configured so that the concentration of corrosive particles and / or corrosive gas in each portion is determined for each of the plurality of portions. The first blowing weight of the corrosion-inhibiting particles of the plurality of blowing ports is set so that the corrosion-inhibiting particles having the corresponding weight can be supplied, and the second detection signal generated by the second corrosion sensor is set. The said 1st blowing weight is adjusted based on this, The said particle | grain supply apparatus is controlled so that the corrosion suppression particle | grains of the said 1st blowing weight adjusted from these several blowing inlets may be blown. Item 3. A boiler with a corrosion inhibitor according to Item 2. An exhaust gas passage through which combustion exhaust gas passes, a superheater pipe provided in the exhaust gas passage, and a corrosion inhibitor for suppressing corrosion of the superheater pipe due to molten salt , the corrosion inhibitor is corrosive In a method for inhibiting corrosion of a boiler having a sensor, a particle supply device, and a control unit,
A plurality of corrosion sensors, each of the plurality of portions in which the superheater tubes is dispersed in the flue gas passage section of a plurality of parts or the superheater tubes dispersed in the flue gas passage section of the space being disposed in said exhaust gas channel Detects the degree of corrosion and generates a detection signal corresponding to the degree of corrosion.
In the exhaust gas passage, the particle supply device is connected to the exhaust gas passage from one or two or more desired injection ports among the plurality of injection ports provided on the upstream side of the flow of the combustion exhaust gas from the superheater tube. The particle diameter is 0.1 μm or more and less than 10 μm and the corrosion of the superheater tube is suppressed by adhering to the surface of the superheater tube.
The control unit supplies, to each of the plurality of portions, corrosion-inhibiting particles having a weight corresponding to the degree of corrosion in each portion, based on the detection signals generated by the plurality of corrosion sensors. A method for inhibiting corrosion of a boiler, wherein the particle supply device is controlled so as to be able to do so. An exhaust gas passage through which combustion exhaust gas passes, a superheater pipe provided in the exhaust gas passage, and a corrosion inhibitor for suppressing corrosion of the superheater pipe due to molten salt , the corrosion inhibitor is corrosive In a method for inhibiting corrosion of a boiler having a sensor, a particle supply device, and a control unit,
The corrosion sensor, each of the plurality of parts distributed in the exhaust gas passage section of a plurality of parts or the superheater tubes dispersed in the flue gas passage section of the space in which the superheater tubes in said exhaust gas passage is installed Detecting the concentration of corrosive particles and / or corrosive gas in the combustion exhaust gas, and generating a detection signal corresponding to the concentration,
In the exhaust gas passage, the particle supply device is connected to the exhaust gas passage from one or two or more desired injection ports among the plurality of injection ports provided on the upstream side of the flow of the combustion exhaust gas from the superheater tube. The particle diameter is 0.1 μm or more and less than 10 μm and the corrosion of the superheater tube is suppressed by adhering to the surface of the superheater tube.
Based on the detection signals generated by the plurality of corrosion sensors, the control unit can supply, to each of the plurality of portions, corrosion-inhibiting particles having a weight corresponding to the concentration at each portion. Thus, the corrosion control method of the boiler characterized by controlling the said particle | grain supply apparatus.

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