JP2019214772A - Corrosion suppression method and device - Google Patents

Abstract

To suppress corrosion of a stoker furnace body.SOLUTION: A rotary grate stoker type incinerator 1 comprises a cooling water supply line 28 which supplies boiler water 31 to a water tube 5 of a stoker furnace body 2 from a waste heat boiler 16. A corrosion suppression device 34 comprises: a heat exchanger 36 provided in the cooling water supply line; a supply line 39 which supplies fluid of temperature lower than that of the boiler water 31 to the heat exchanger 36; a flow rate adjustment part which adjusts a supply amount of the fluid supplied to the heat exchanger 36; a measuring instrument 35 which measures concentration of a corrosive component in the exhaust gas 19 of the rotary grate stoker type incinerator 1; and a controller 41. The controller 41 sets a target temperature of the boiler water 31 supplied to the water tube 5 to be sequentially low with increase of the concentration of the corrosive component in the exhaust gas 19 on the basis of information received from the measuring instrument 35, and gives the flow rate adjustment part a command for adjusting the supply amount of the fluid of low temperature supplied to the heat exchanger 36 so that the temperature of the boiler water 31 after having passed through the heat exchanger 36 becomes a target temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method and an apparatus for controlling corrosion of a stoker furnace main body in a rotary stoker type incinerator.

  As one of the incinerators for incinerating wastes or other objects to be treated, there is a rotary stoker type incinerator (for example, see Patent Document 1).

  The rotary stoker type incinerator has an inlet header pipe and an outlet header pipe formed in a ring shape, a plurality of water pipes arranged at regular intervals in the circumferential direction and connected between the header pipes, and a plurality of water pipes. It has a cylindrical stoker furnace main body having a configuration including fins mounted in gaps between the fins and air holes formed in each fin. The stalker furnace main body is rotatably placed in the cover casing in an inclined posture in which the outlet header tube is lower than the inlet header tube.

  In addition, the rotary stoker type incinerator has a driving device that rotates the stoker furnace main body, a wind box that supplies primary combustion air from below the stoker furnace main body, and loads waste in the input hopper into the stoker furnace main body. And the inside of the rotating stoker furnace main body becomes a primary combustion chamber.

  Furthermore, the rotary stoker type incinerator includes a secondary combustion chamber and a waste heat boiler downstream of the outlet side of the stoker furnace main body, and a rotary joint connected to an outlet header pipe of the stoker furnace main body, and a rotary. A cooling water supply line connecting the cooling water inlet of the joint and the waste heat boiler, a circulating pump provided in the cooling water supply line, and a cooling water return line connecting the cooling water outlet of the rotary joint and the waste heat boiler; Is provided.

  Thus, the rotary stoker type incinerator is configured to cool the stoker furnace main body and recover heat by circulating boiler water guided from the waste heat boiler by operating the circulation pump through the water pipe of the stoker furnace main body. ing.

  Steam generated in a waste heat boiler of a rotary stoker type incinerator is often used as a working fluid in a steam turbine that drives a generator.

  The boiler water is saturated water under the boiler pressure. When the waste heat boiler has a boiler pressure of 3 MPa, the temperature of the saturated water is about 230 degrees.

  In the rotary stoker type incinerator, depending on the quality and properties of the object to be incinerated, metal salts such as metal chlorides and sulfates may be generated in the stoker furnace main body. In some cases, a eutectic salt that melts at a lower temperature than a simple metal salt may be produced. In the rotary stoker type incinerator, when these metal salts and eutectic salts exist in a molten state in the stoker furnace main body, the corrosiveness to metal surfaces such as water tubes and fins of the stoker furnace main body increases.

  Therefore, in the conventional rotary stoker type incinerator, the temperature of the water pipe of the stoker furnace main body and the surface of the fin are not raised to a temperature range in which metal salts and eutectic salts that are assumed to be generated in the stoker furnace main body are melted. The temperature of the boiler water supplied to the water pipe of the stoker furnace body is set, and the boiler pressure of the waste heat boiler is determined in accordance with the temperature of the boiler water.

JP 2003-279020 A

  By the way, in recent years, rotary stoker type incinerators have been desired to improve the efficiency of power generation by driving a steam turbine, and for the purpose of improving such power generation efficiency, a rotary stoker type incinerator has a waste heat boiler. There is a demand for higher pressure of generated steam.

  However, when increasing the pressure of the steam generated in the waste heat boiler, the temperature of the boiler water circulated and supplied from the waste heat boiler to the water pipe of the stoker furnace body rises more than before. For example, when the boiler pressure of the waste heat boiler is set to 4 MPa, the temperature of the boiler water rises to about 250 degrees. When the boiler pressure of the waste heat boiler is further increased, the temperature of the boiler water further increases.

  Therefore, when increasing the pressure of steam generated in a waste heat boiler, the rotating stoker type incinerator requires a temperature range in which the surface temperature of the water pipes and fins of the stoker furnace body is higher than the temperature range in which conventional corrosion was avoided. Become. Therefore, when a metal salt or a eutectic salt that melts in the temperature range is generated in the stoker furnace main body, corrosion is likely to occur on the metal surface of the water tube and the fin of the stoker furnace main body.

  Therefore, in the rotary stoker type incinerator, it is desired to take measures for suppressing corrosion of the stoker furnace main body when increasing the pressure of steam generated in the waste heat boiler.

  Therefore, the present invention seeks to provide a corrosion suppression method and apparatus capable of suppressing corrosion of a stoker furnace body when increasing the pressure of steam generated in a waste heat boiler in a rotary stoker type incinerator. is there.

  The present invention provides a heat exchanger provided in a cooling water supply line for supplying boiler water from a waste heat boiler to a water pipe of a stoker furnace main body of a rotary stoker type incinerator, A supply line that supplies a fluid having a lower temperature than the boiler water used for heat exchange with the boiler water, and a flow rate adjustment unit that adjusts a supply amount of the fluid that is supplied from the supply line to the heat exchanger. A concentration information acquisition device that acquires information on the concentration of corrosive components in the exhaust gas discharged from the rotary stoker type incinerator, and a controller, wherein the controller is configured to control the concentration information in the exhaust gas from the concentration information acquisition device. A function of receiving the concentration information of the corrosive component, a target temperature setting function of setting a target temperature of the boiler water supplied to the water pipe based on the concentration information, and the target of the set boiler water. Warm Based on, a corrosion inhibiting device having a structure and a function of providing an instruction to the flow rate regulator.

  The controller, as the target temperature setting function, as the concentration of the corrosive component in the exhaust gas in the concentration information received from the concentration information acquisition device increases from a low state to a high state, to the water pipe of the stoker furnace body. A configuration may be provided having a function of setting the target temperature of the supplied boiler water to a temperature sequentially lowered from the temperature of the saturated water corresponding to the boiler pressure of the waste heat boiler.

  The controller supplies the temperature of the boiler water after passing through the heat exchanger to the heat exchanger, which is required to match the target temperature set by the target temperature setting function. A configuration having a target flow rate setting function of obtaining the flow rate of the fluid and setting the target flow rate, and a function of giving the target flow rate set by the target flow rate setting function as a command to the flow rate adjusting unit may be provided. Good.

  The concentration information acquisition device may be configured to have a function of acquiring information on the concentration of hydrogen chloride and the concentration of sulfur oxide as the corrosive components in the exhaust gas.

  The cooling water supply line on the downstream side of the heat exchanger includes a thermometer, and the controller is configured to set an actual measurement value of the temperature of the boiler water received from the thermometer by the target temperature setting function. It may be configured to have a function of performing feedback control on the target flow rate of the fluid supplied to the heat exchanger so as to match the target temperature of the boiler water.

  Further, in a rotary stoker type incinerator, a cooling water supply line for supplying boiler water from a waste heat boiler to a water pipe of the stoker furnace main body, a heat exchanger provided in the cooling water supply line, and the heat exchanger A supply line for supplying a fluid having a temperature lower than that of the boiler water, and a flow rate adjusting unit for adjusting a supply amount of the fluid to be supplied from the supply line to the heat exchanger, wherein exhaust gas of the rotary stoker type incinerator is provided. The process of acquiring the concentration information of the corrosive component, and, based on the information of the concentration of the corrosive component in the exhaust gas, as the concentration of the corrosive component increases from low to high, the stoker furnace body A process for setting the target temperature of the boiler water to be supplied to the water pipe from a temperature of the saturated water corresponding to the boiler pressure of the waste heat boiler to a temperature that is sequentially reduced; and a process of setting the boiler water after passing through the heat exchanger. A process of determining the flow rate of the fluid to be supplied to the heat exchanger, which is required to match the temperature to the target temperature, and setting the target flow rate; and setting the set target flow rate to the flow rate adjustment. And a process for giving a command to a part.

  ADVANTAGE OF THE INVENTION According to the corrosion suppression method and apparatus of this invention, when increasing the pressure of the steam generated in the waste heat boiler in the rotary stoker type incinerator, the corrosion of the stoker furnace main body can be suppressed.

It is a schematic diagram showing a 1st embodiment of a corrosion control device used for performing a corrosion control method. It is a figure which shows the basic structure of a rotary stoker type incinerator. It is a figure which shows an example of the relationship between the density | concentration of the corrosive component in exhaust gas, and the target temperature of boiler water supplied to a water pipe. It is a flowchart which shows the process by the controller of a corrosion suppression apparatus. It is a schematic diagram showing a 2nd embodiment of a corrosion control device.

  Hereinafter, a method and an apparatus for controlling corrosion of the present disclosure will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic diagram illustrating a first embodiment of a corrosion suppression device used for performing the corrosion suppression method of the present disclosure. 2A and 2B show a basic configuration of a rotary stoker type incinerator. FIG. 2A is a cut side view, and FIG. 2B is a view taken in the direction of arrows AA in FIG. 2A. FIG. 2C is an enlarged view of a portion B in FIG. 2B. FIG. 3 is a diagram showing an example of the relationship between the concentration of corrosive components in exhaust gas and the target temperature of boiler water supplied to a water pipe. FIG. 4 is a flowchart showing processing by the controller of the corrosion suppression device.

  The corrosion suppression device of the present embodiment is applied to a rotary stoker type incinerator 1 as shown in FIGS. 2 (a), 2 (b) and 2 (c).

  Here, a basic configuration of the rotary stoker type incinerator 1 will be described.

  As shown in FIGS. 2A, 2B, and 2C, the rotary stoker-type incinerator 1 includes a cylindrical stoker furnace main body 2 having an internal space serving as a primary combustion chamber.

  The stoker furnace main body 2 is arranged at a constant interval in the circumferential direction between the inlet-side header tube 3 and the outlet-side header tube 4 formed in a ring shape, and the header tubes 3, 4. , 4, a plurality of water pipes 5 connected to each other, fins 6 attached to gaps between adjacent water pipes 5, and air holes 7 formed in the fins 6. Thus, the stoker furnace main body 2 is a stoker in which the furnace wall is formed by the water pipe 5 and the fins 6 having the air holes 7.

  The stalker furnace main body 2 is rotatably placed in the cover casing 8 in an inclined posture in which the outlet header tube 4 is lower than the inlet header tube 3.

  The rotary stoker type incinerator 1 further includes a driving device 9 for rotating and driving the stoker furnace main body 2, a wind box 10 for supplying primary combustion air 11 from below the stoker furnace main body 2, and a waste 13 as a processing target. And a dust feeding device 14 for charging the waste 13 in the charging hopper 12 into the stoker furnace main body 2.

  The rotary stoker type incinerator 1 is configured to include a secondary combustion chamber 15 connected to a cover casing 8 and a waste heat boiler 16 for recovering heat, on the downstream side of the stoker furnace main body 2. The secondary combustion chamber 15 is provided with a nozzle 17 for supplying secondary combustion air 18.

  Thus, the rotary stoker-type incinerator 1 loads the waste 13 in the charging hopper 12 into the stoker furnace main body 2 by the dust feeding device 14 in a state where the stoker furnace main body 2 is rotationally driven by the driving device 9. Further, the waste 13 can be burned in the stoker furnace main body 2 by the primary combustion air 11 blown from below from the wind box 10 through the air holes 7 of the fins 6.

  In the rotary stoker type incinerator 1, unburned gas generated when the waste 13 is burned in the stoker furnace main body 2 is guided to the secondary combustion chamber 15 and burned by the secondary combustion air 18 blown from the nozzle 17. The heat generated by this combustion is recovered by a waste heat boiler 16 connected to the secondary combustion chamber 15.

  In the present embodiment, as shown in FIG. 1, downstream of the waste heat boiler 16 of the rotary stoker type incinerator 1, a flow path 20 of the exhaust gas 19 discharged from the waste heat boiler 16, , A dust collecting device 22 and an induction blower 23 are sequentially provided, and a downstream side of the flow passage 20 is connected to a chimney 24.

  Further, a drug supply device 25 is attached to a position on the upstream side of the dust collecting device 22 in the flow passage 20. The medicine supply device 25 has a function of dispersing and supplying a medicine 26 for absorbing an acidic gas such as slaked lime in the exhaust gas 19 flowing through the flow passage 20 at a set supply amount. As a result, the exhaust gas 19 flowing through the flow passage 20 is converted into an acid gas such as hydrogen chloride (HCl) or sulfur oxide (SOx) contained in the exhaust gas 19 by the medicine 26 supplied from the medicine supply device 25. Neutralized and removed. The reaction product generated by the neutralization reaction of the acidic gas by the chemical 26 is sent to the dust collecting device 22 by the flow of the exhaust gas 19 flowing through the flow passage 20, and the dust collecting process in the dust collecting device 22 causes fly ash or It is separated from the exhaust gas 19 together with the dust.

  In the rotary stoker type incinerator 1, a rotary joint 27 is connected to the outlet side header pipe 4 of the stoker furnace main body 2, as shown in FIGS.

  Further, as shown in FIG. 1, one end serving as a downstream end of a cooling water supply line 28 provided with a circulation pump 29 is connected to a cooling water inlet 27 a of the rotary joint 27. The other end, which is the upstream end of the cooling water supply line 28, is connected to the waste heat boiler 16.

  One end, which is the upstream end of the cooling water return line 30, is connected to the cooling water outlet 27b of the rotary joint 27. The other end, which is the downstream end of the cooling water return line 30, is connected to the waste heat boiler 16.

  Thereby, the rotating stoker type incinerator 1 operates the circulation pump 29 to transfer the boiler water 31 guided from the waste heat boiler 16 through the cooling water supply line 28 to the water pipe 5 of the stoker furnace main body 2 via the rotary joint 27. It can be circulated and supplied as cooling water. Therefore, in the rotary stoker type incinerator 1, the water pipe 5 and the fins 6 on the furnace wall of the stoker furnace main body 2 can be cooled by the boiler water 31 circulated and supplied to the water pipe 5, and heat can be recovered. . The boiler water 31 heated for use in heat recovery in the water pipe 5 is led to the waste heat boiler 16 through the rotary joint 27 and the cooling water return line 30 and is used as a heat source for generating steam in the waste heat boiler 16. Is done.

  2 (a), 2 (b) and 2 (c), a reference numeral 32 denotes a post-combustion device for the incineration ash provided in the rotary stoker type incinerator 1, and a reference numeral 33 denotes the primary combustion air 11 supplied from the wind box 10. Is a seal member for suppressing blow-through into the cover casing 8.

  The corrosion suppression device of the present embodiment applied to the rotary stoker type incinerator 1 having the above configuration is indicated by reference numeral 34 in FIG. 1, and is a corrosive component in the exhaust gas 19 discharged from the rotary stoker type incinerator 1. 35, a heat exchanger 36 provided in the cooling water supply line 28, and a fluid 37 lower in temperature than the boiler water 31 (hereinafter referred to as a low temperature fluid 37). A supply unit 38 for supplying the heat exchanger 36, a supply line 39 connecting the supply unit 38 and the heat exchanger 36, a flow control valve 40 as a flow control unit provided in the supply line 39, and a controller 41. It is configured.

  In the present embodiment, the measuring device 35 is provided at a position downstream of the cooling tower 21 in the flow path 20 of the exhaust gas 19 and upstream of a mounting location of the drug supply device 25. According to this configuration, the measuring device 35 targets the exhaust gas 19 discharged from the rotary stoker-type incinerator 1 and the exhaust gas 19 before the neutralization of the acidic gas by the chemical 26 is performed. Measurement of the concentration of corrosive components therein can be performed. In addition, the measuring device 35 may be provided at a position on the upstream side of the cooling tower 21 in the flow passage 20 according to the heat resistance performance of the measuring device 35.

  By the way, the exhaust gas 19 to be measured by the measuring instrument 35 is in a state containing a corrosive component. Therefore, as the measuring instrument 35, a non-contact measuring instrument 35 capable of measuring the concentration of the corrosive component without contact with the exhaust gas 19, for example, a measuring instrument 35 such as a laser analyzer may be used. preferable.

The measuring device 35 in the present embodiment measures, for example, the concentration C _HCl [ppm] of hydrogen chloride (HCl) and the concentration C _SOx [ppm] of sulfur oxide (SOx) in the exhaust gas 19 as corrosive components. It has the function to do. The measuring device 35 has a function of measuring the concentration of hydrogen chloride C _HCl and the concentration of sulfur oxide C _SOx in the exhaust gas 19 because the metal salt involved in the corrosion of the stoker furnace main body 2 is used. This is mainly because they are metal chlorides, sulfates, and eutectic salts thereof.

Furthermore, the measurement device 35 sends the measurement result, and the concentration C _HCl hydrogen chloride in the exhaust gas 19 discharged from the rotary stoker incinerator 1, the information density C _SOx sulfur oxides, to the controller 41 functions It has.

  In this embodiment, the heat exchanger 36 is provided at a position downstream of the circulation pump 29 in the cooling water supply line 28.

  The heat exchanger 36 has a configuration in which a flow path 42 for the boiler water 31 and a flow path 43 for the low-temperature fluid 37 are provided in a state separated by a heat transfer surface. The heat transfer surface may be of any type, such as a tube wall of a heat transfer tube or a flat plate.

  The flow path 42 has an inlet 42a connected to the downstream end of the upstream cooling water supply line 28, and an outlet 42b connected to the upstream end of the downstream cooling water supply line 28.

  The downstream end of the supply line 39 is connected to the inlet 43 a of the flow path 43. The upstream side of the supply line 39 is connected to the supply unit 38. The upstream side of the recovery line 44 for the low temperature fluid 37 is connected to the outlet 43 b of the flow path 43. The downstream side of the recovery line 44 is connected to a heat utilization unit 45 that utilizes heat held by the low-temperature fluid 37.

  Thereby, the heat exchanger 36 allows the boiler water 31 guided from the waste heat boiler 16 through the cooling water supply line 28 to flow through the flow path 42 by the operation of the circulation pump 29, and is guided from the supply unit 38 through the supply line 39. The heat exchange between the boiler water 31 and the low-temperature fluid 37 can be performed with the low-temperature fluid 37 flowing through the flow path 43. The low-temperature fluid 37 has a lower temperature than the boiler water 31 supplied as saturated water from the waste heat boiler 16. Therefore, in the heat exchanger 36, heat can be transferred from the boiler water 31 to the low-temperature fluid 37 by heat exchange between the boiler water 31 and the low-temperature fluid 37, and the temperature of the boiler water 31 can be reduced. Can be.

  By the way, since the boiler water 31 guided from the waste heat boiler 16 to the cooling water supply line 28 is saturated water, the temperature is determined according to the boiler pressure set in the waste heat boiler 16. In addition, since the water pipe 5 and the fins 6 on the furnace wall of the stoker furnace main body 2 need to be cooled, the supply amount of the boiler water 31 to be circulated to the water pipe 5 of the stoker furnace main body 2 by operating the circulation pump 29 is determined. Therefore, in the heat exchanger 36, the flow rate of the boiler water 31 flowing through the flow path 42 is substantially constant.

  The corrosion control device 34 of the present embodiment includes the flow control valve 40 as a flow control unit for controlling the supply amount of the low-temperature fluid 37 supplied to the heat exchanger 36 in the supply line 39. , The flow rate of the low-temperature fluid 37 supplied to the flow path 43 of the heat exchanger 36 becomes zero. In this case, the transfer of heat between the low-temperature fluid 37 remaining in the flow path 43 and the boiler water 31 flowing through the flow path 42 is balanced, and the boiler water 31 exchanges heat without lowering the temperature. To pass through the vessel 36. Therefore, in this case, the boiler water 31 guided from the waste heat boiler 16 to the cooling water supply line 28 can be supplied to the water pipe 5 of the stoker furnace main body 2 without lowering the temperature.

  In addition, the corrosion suppression device 34 of the present embodiment operates the flow control valve 40 from the closed state to the open direction to gradually increase the flow rate of the low-temperature fluid 37 supplied to the flow path 43 of the heat exchanger 36. In the heat exchanger 36, the transfer of heat from the boiler water 31 to the low-temperature fluid 37 can be promoted.

  For this reason, the corrosion suppression device 34 of the present embodiment uses the heat exchanger 36 to convert the low-temperature fluid The amount of heat transferred to the heat exchanger 37 can be increased or decreased, and the amount of decrease in the temperature of the boiler water 31 when passing through the heat exchanger 36 can be increased or decreased.

  Accordingly, the corrosion suppression device 34 of the present embodiment is in a state where the supply of the low-temperature fluid 37 to the flow path 43 of the heat exchanger 36 is stopped by operating the flow control valve 40 while the circulation pump 29 is operating. The boiler water 31 can be supplied from the heat boiler 16 to the cooling water supply line 28 to the water pipe 5 of the stoker furnace main body 2 while maintaining the temperature in the state of saturated water. Therefore, in this case, in the stoker furnace main body 2, the temperature of the water pipe 5 is cooled to a temperature corresponding to the temperature of the boiler water 31 as the saturated water.

  On the other hand, the corrosion suppression device 34 of the present embodiment increases the supply amount of the low-temperature fluid 37 to the flow path 43 of the heat exchanger 36 by operating the flow control valve 40 while the circulation pump 29 is operating. As the supply amount of the low-temperature fluid 37 increases, the boiler water 31 having a lower temperature can be supplied to the water pipe 5 of the stoker furnace main body 2 when passing through the flow path 42 of the heat exchanger 36. Therefore, in this case, in the stoker furnace main body 2, the temperature of the water pipe 5 is cooled to a temperature corresponding to the lowered temperature of the boiler water 31.

  As described above, even when the temperature of the boiler water 31 is reduced and supplied to the water pipe 5 of the stoker furnace main body 2, the boiler pressure of the waste heat boiler 16 and the stoker furnace main body 2 There is no need to change the pressure condition of the path for circulating and supplying the boiler water 31 to the water pipe 5.

  In the corrosion suppression device 34 of the present embodiment, the low-temperature fluid 37 that has been heated and has been subjected to heat exchange with the boiler water 31 in the heat exchanger 36 is guided to the heat utilization unit 45 via the recovery line 44. The heat utilization section 45 utilizes the heat of the low-temperature fluid 37. As described above, the corrosion suppression device 34 of the present embodiment may change the supply amount of the low-temperature fluid 37 to the heat exchanger 36, or may set the supply amount to zero. Therefore, the amount of heat sent from the heat exchanger 36 to the heat utilization unit 45 by the low-temperature fluid 37 passing through the recovery line 44 changes depending on the situation, and may be zero. Therefore, the heat utilization unit 45 may have a function and configuration capable of coping with a change in the amount of heat received from the low-temperature fluid 37 and a change in the amount of heat to zero. An example of this type of heat utilization unit 45 is, for example, a binary power generator.

  Next, the function of the controller 41 will be described, and a corrosion control method performed by the corrosion control device 34 of the present embodiment will be described.

As shown in FIG. 1, the controller 41 has a function of receiving information on the concentration C _{HCl of} hydrogen chloride and the concentration C _SOx of sulfur oxide in the exhaust gas 19 from the measuring device 35.

  Further, the controller 41 is configured to include a target temperature setting function, a target flow rate setting function, and a function of instructing the flow rate control valve 40 the target flow rate set by the target flow rate setting function.

  Here, conditions that are presupposed when performing each of the functions of the controller 41 will be described.

  The configuration of the rotary stoker type incinerator 1 including the water pipe 5 of the stoker furnace main body 2 is known in an actual machine, and the performance regarding heat exchange in the stoker furnace main body 2 is determined. Therefore, in the rotary stoker type incinerator 1, the correlation between the temperature of the boiler water 31 through which the water pipe 5 of the stoker furnace main body 2 flows during operation and the temperature of the furnace wall of the stoker furnace main body 2 including the water pipe 5 is designed. It is known from information or tests using actual equipment.

  Further, in the rotary stoker type incinerator 1, as described above, the temperature of the boiler water 31 guided from the waste heat boiler 16 to the cooling water supply line 28 according to the boiler pressure set in the waste heat boiler 16 is: I have decided. Further, the supply amount of the boiler water 31 circulated and supplied to the water pipe 5 of the stoker furnace main body 2 by the operation of the circulation pump 29 is determined. This supply amount is the same as the supply amount of the boiler water 31 supplied from the waste heat boiler 16 to the flow path 42 of the heat exchanger 36 via the cooling water supply line 28.

  Further, the performance of the heat exchanger 36 regarding heat exchange between the boiler water 31 flowing through the flow path 42 and the low-temperature fluid 37 flowing through the flow path 43 is determined according to the specifications.

  Further, it is assumed that the temperature of the low-temperature fluid 37 supplied from the supply unit 38 to the flow path 43 of the heat exchanger 36 via the supply line 39 is maintained at a certain temperature.

  Thus, in the heat exchanger 36, the temperature and the flow rate of the boiler water 31 supplied to the flow path 42 are determined, and the temperature of the low-temperature fluid 37 flowing through the flow path 43 is determined. The amount of heat exchange with the fluid 37 has a correlation with the flow rate of the low-temperature fluid 37 flowing through the channel 43.

  Therefore, in the heat exchanger 36, according to the change in the flow rate of the low-temperature fluid 37 supplied to the flow path 43, the low-temperature fluid 37 is sent to the water pipe 5 of the stoker furnace main body 2 via the cooling water supply line 28 after passing through the flow path 42. The temperature of the boiler water 31 can be changed. Therefore, the controller 41 determines the flow rate of the low-temperature fluid 37 supplied to the flow path 43 and the boiler water 31 sent to the water pipe 5 of the stoker furnace main body 2 through the cooling water supply line 28 after passing through the flow path 42. Information on the relationship with the temperature is stored in advance.

Further, in the rotary stoker type incinerator 1, metal salts such as metal chlorides and sulfates may be generated inside the stoker furnace main body 2, which is the primary combustion chamber of the waste 13, and furthermore, a plurality of metals may be used. Salts may form eutectic salts that melt at lower temperatures. As described above, in the case where metal chlorides, sulfates, and eutectic salts are generated inside the stoker furnace main body 2, the exhaust gas 19 discharged from the rotary stoker incinerator 1 is used in the rotary stoker incinerator 1. The concentration of hydrogen chloride in the solution, C _HCl , and the concentration of sulfur oxides, C _SOx , increase.

Therefore, for the rotary stoker type incinerator 1, based on the concentration of hydrogen chloride C _HCl and the concentration of sulfur oxide C _SOx in the exhaust gas 19, as shown in the following equation (1), By calculating a concentration coefficient that gives a weight to the concentration C _HCl and the concentration C _SOx of the sulfur oxide, the amount of generated metal salt and eutectic salt inside the stoker furnace main body 2 and the type of generated metal salt and eutectic salt are estimated. can do.

(Concentration coefficient) = η (α × C _HCl + β × C _SOx ) (1)

Here, α, β and η are constants that give weight to the concentration of hydrogen chloride C _HCl , the concentration of sulfur oxide C _SOx , and both concentrations when estimating the generation of metal salts and eutectic salts. It may be determined from experiments and rules of thumb.

  By the way, from the concentration coefficient, it is possible to estimate the amount of generated metal salt and eutectic salt inside the stoker furnace main body 2 and the type of generated metal salt and eutectic salt. As a countermeasure for suppressing the corrosion of the stoker furnace main body 2 in a situation in which the metal salt or the eutectic salt estimated to occur is present inside the stoker furnace main body 2, the temperature of the stoker furnace main body 2 is controlled by controlling the temperature of the metal. The temperature may be lowered to a temperature range in which the salt or the eutectic salt does not melt.

  The information of the temperature range in which a certain metal salt or eutectic salt does not melt is known from the melting point of the metal salt or eutectic salt. Further, as described above, the correlation between the temperature of the boiler water 31 through which the water pipe 5 of the stoker furnace main body 2 flows and the temperature of the furnace wall of the stoker furnace main body 2 including the water pipe 5 is known.

  Therefore, as shown in FIG. 3, the controller 41 in the present embodiment stores in advance information defining the relationship between the concentration coefficient and the target temperature Ts of the boiler water 31 to be supplied to the water pipe 5 of the stoker furnace main body 2. are doing.

  In FIG. 3, as an example, when the value of the concentration coefficient is larger than y1, the target temperature Ts of the boiler water 31 is set to a temperature region from x1 to x2, and the value of the concentration coefficient is y1 or less and y2 or less. Is also large, the target temperature Ts of the boiler water 31 is set to a temperature range from x2 to x3. If the value of the concentration coefficient is y2 or less, the target temperature Ts of the boiler water 31 is set to x3 to x4. The case where the temperature range is set is shown. Here, x1 <x2 <x3 <x4. Although FIG. 1 shows an example in which three sections are set for the concentration coefficient and the target temperature Ts of the boiler water 31, two sections or a plurality of sections of four or more sections may be set. Of course. Further, the temperature region on the highest temperature side of the target temperature Ts of the boiler water 31 may be set to, for example, the temperature of the boiler water 31 as the saturated water according to the boiler pressure of the waste heat boiler 16.

  Next, a process performed by the controller 41 will be described with reference to FIG.

When the operation of the rotary stoker type incinerator 1 is started, the controller 41 starts processing. First, the measuring device 35 supplies the concentration C _{HCl of} the hydrogen chloride in the exhaust gas 19 discharged from the rotary stoker type incinerator 1, and Then, information on the concentration C _SOx of the sulfur oxide is received (step S1).

Next, the controller 41 calculates a concentration coefficient by the above equation (1) based on the received information of the concentration C _HCl and the concentration C _SOx (step S2).

  Further, as a target temperature setting function, the controller 41 uses the stored information of FIG. 3 on the basis of the concentration coefficient obtained in step S2 and uses the stored information of FIG. A target temperature is obtained (step S3).

  Next, the controller 41 performs a determination process of determining whether or not the density coefficient has continued for the set time in the same section (step S4).

  If it is determined by the determination processing in step S4 that the density coefficient has not continued for the time set in the same section, the controller 41 returns to step S1 and performs the processing from step S1 again. .

  On the other hand, when it is determined that the density coefficient has continued for the time set in the same section by the determination processing in step S4, the controller 41 proceeds to step S5.

  In step S5, the controller 41 performs, as a target flow rate setting function, the stored flow rate of the low-temperature fluid 37 supplied to the flow path 43 of the heat exchanger 36 and the temperature of the boiler water 31 after passing through the flow path 42. Based on the information on the relationship between the temperature of the boiler water 31 and the low temperature supplied to the flow path 43 of the heat exchanger 36, which is required to match the temperature of the boiler water 31 with the target temperature of the boiler water 31 obtained in step S3. The flow rate of the fluid 37 is obtained and set as a flow rate target.

  Thereafter, the controller 41 performs a process of giving the target flow rate set in step S5 as a command to the flow rate control valve 40 (step S6).

  Thus, in the corrosion suppression device 34 of the present embodiment, the flow control valve 40 provided in the supply line 39 is operated according to a command from the controller 41. Therefore, the boiler water 31 supplied from the waste heat boiler 16 to the flow path 42 of the heat exchanger 36 exchanges heat with the low-temperature fluid 37 while passing through the flow path 42, and The temperature corresponds to the target temperature Ts set in step S3.

  At this time, as shown in FIG. 1, the corrosion suppression device 34 of the present embodiment connects the heat exchanger 36 to the downstream cooling water supply line 28 connected to the outlet 42 b of the flow path 42 of the heat exchanger 36. After the passage, a thermometer 46 for measuring the temperature of the boiler water 31 supplied to the water pipe 5 of the stoker furnace main body 2 is provided, and information on the actual measurement value of the temperature of the boiler water 31 by the thermometer 46 is transmitted to the controller. It is more preferable to input the data to 41. According to this configuration, the controller 41 controls the flow path 43 of the heat exchanger 36 so that the measured value of the temperature of the boiler water 31 received from the thermometer 46 matches the target temperature Ts set in step S3. Feedback control can be performed on the target flow rate of the low-temperature fluid 37 supplied to the apparatus. Therefore, in the case of this configuration, controllability in controlling the temperature of the boiler water 31 supplied to the water pipe 5 of the stoker furnace main body 2 to the target temperature Ts can be improved.

  Therefore, in the rotary stoker type incinerator 1 including the corrosion suppression device 34 of the present embodiment, the temperature of the boiler water 31 supplied to the water pipe 5 of the stoker furnace main body 2 becomes a temperature corresponding to the target temperature Ts. Therefore, the temperature of the stoker furnace main body 2 is controlled to a temperature range in which the metal salt or the eutectic salt presumably generated inside the stoker furnace main body 2 at that time does not melt.

  Thereby, the stoker furnace main body 2 is prevented from being corroded by the molten metal salt or eutectic salt.

  When the processing in step S6 is completed, the controller 41 returns to step S1 and performs the processing from step S1 again.

The corrosion suppressing apparatus 34 of the present embodiment having the above-described configuration includes the concentration C _{HCl of} hydrogen chloride as a corrosive component in the exhaust gas 19 discharged from the rotary stoker incinerator 1 and the concentration C _{SOx of} sulfur oxide. , A process of calculating a concentration coefficient based on the above equation (1), and a boiler water 31 to be supplied to the water pipe 5 of the stoker furnace main body 2 based on the obtained concentration coefficient. And a heat exchanger 36 required to match the temperature of the boiler water 31 after passing through the heat exchanger 36 provided in the cooling water supply line 28 to the target temperature Ts. The process of obtaining the flow rate of the low-temperature fluid 37 supplied to the heat exchanger 36 and setting the flow rate target as a flow rate target, Directive and , A process of providing Te can implement the corrosion inhibiting method for performing.

Thereby, the corrosion suppressing apparatus 34 of the present embodiment is controlled by the controller 41 from the state where the concentration of hydrogen chloride C _HCl and the concentration of sulfur oxide C _{SOx in} the exhaust gas 19 are low for the rotary stoker type incinerator 1. As the temperature increases, the temperature of the boiler water 31 supplied to the water pipe 5 of the stoker furnace main body 2 may be controlled to be set to a target temperature gradually lowered from the temperature of the saturated water corresponding to the boiler pressure of the waste heat boiler 16. it can.

In the rotary stoker-type incinerator 1, when increasing the pressure of the steam generated in the waste heat boiler 16, the temperature of the boiler water 31 as saturated water guided from the waste heat boiler 16 to the cooling water supply line 28 increases. On the other hand, according to the corrosion suppression method and apparatus of the present embodiment, as the concentration C _{HCl of} hydrogen chloride, which is a corrosive component in the exhaust gas 19, and the concentration C _SOx of sulfur oxide increase from a low state to a high state, When it is estimated that metal salts such as metal chlorides and sulfates or eutectic salts are generated inside the stoker furnace main body 2, the temperature of the boiler water 31 supplied to the water pipe 5 of the stoker furnace main body 2 is set in advance. In the heat exchanger 36, the temperature of the saturated water according to the boiler pressure of the waste heat boiler 16 can be sequentially reduced. Therefore, the method and the apparatus for suppressing corrosion of the present embodiment provide the temperature of the furnace wall provided with the water pipe 5 and the fin 6 of the stoker furnace main body 2 with the metal salt presumed to be generated inside the stoker furnace main body 2, Since the temperature can be controlled to a temperature range in which the eutectic salt does not melt, it is possible to suppress the possibility that corrosion occurs on the furnace wall of the stoker furnace main body 2.

  The corrosion suppression device 34 of the present embodiment is provided with a heat exchanger 36 on the downstream side of the circulation pump 29 in the cooling water supply line 28 with respect to the rotary stoker type incinerator 1 of the same type as the related art. Except for connecting a measuring device 35 for measuring the concentration of corrosive components in the exhaust gas 19 to the flow path 20 of the exhaust gas 19 downstream of the boiler 16, no particular structural change is required. Therefore, the corrosion suppression device 34 of this embodiment can be easily applied to the rotary stoker type incinerator 1 of the same type as the conventional one.

[Second embodiment]
FIG. 5 is a schematic diagram showing a second embodiment of the corrosion suppression device.

  In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

  The corrosion suppression device 34 of the present embodiment has a configuration similar to that of the first embodiment, except that the measuring device 35 is provided on the flow path 20 of the exhaust gas 19 at a position upstream of the mounting position of the drug supply device 25. A concentration information acquisition device for acquiring information on the concentration of corrosive components in the exhaust gas 19 discharged from the rotary stoker type incinerator 1 is provided at a position downstream of the dust collecting device 22 in the flow path 20 of the exhaust gas 19. The measuring device 47 and the calculating device 48 are provided.

  In the present embodiment, the measuring device 47 is provided at a position downstream of the induction blower 23 in the flow path 20 of the exhaust gas 19. According to this configuration, the measuring device 47 can measure the concentration of the corrosive component for the exhaust gas 19 that has passed through the dust collecting device 22. Therefore, in this configuration, fly ash and dust contained in the exhaust gas 19 discharged from the rotary stoker type incinerator 1 (see FIGS. 2A, 2B, and 2C) adhere to the measuring device 47. It is possible to suppress the possibility that the measurement result of the measuring device 47 is affected by the gas or the gas passage in the measuring device 47 being clogged.

The measuring device 47 measures the concentration of hydrogen chloride C _HCl [ppm] and the concentration of sulfur oxide C _SOx [ppm] in the exhaust gas 19 as corrosive components, similarly to the measuring device 35 in the first embodiment. It has the function to do.

The measuring device 47 also has a function of measuring the flow rate Qg [m ³ N / h] of the exhaust gas 19 flowing through the flow passage 20.

  Further, the measuring device 47 has a function of transmitting the measurement results obtained by the above functions to the computing device 48.

Incidentally, the measuring instrument measurement results and the concentration C _HCl hydrogen chloride in the exhaust gas 19 obtained as the 47, the concentration C _SOx sulfur oxides, exhaust gas 19 after being processed by agents 26, which is supplied from the medicine supply apparatus 25 It is the concentration of hydrogen chloride and sulfur oxides remaining in it.

In addition, regarding the chemical 26 used for the treatment of the exhaust gas 19, the removal amount δ _HCl [m ³ N / kg] of hydrogen chloride by the hydrogen chloride removal reaction per unit weight of the chemical 26 and the sulfur per unit weight of the chemical 26 The removal amount of sulfur oxides by the oxide removal reaction, δ _SOx [m ³ N / kg], is based on past data obtained from the exhaust gas treatment of existing rotary stoker incinerators and other types of incinerators. , You can ask. For convenience, in the following description, δ _HCl is referred to as the amount of hydrogen chloride removed per unit weight of the drug 26, and δ _SOx is referred to as the amount of sulfur oxide removed per unit weight of the drug 26.

Specifically, of the chemicals 26 supplied from the chemical supply device 25 to the flow passage 20 of the exhaust gas 19, the ratio contributing to the hydrogen chloride removal reaction and the ratio contributing to the sulfur oxide removal reaction are From actual performance data. This is defined as the contribution ratio ε _HCl [%] of the hydrogen chloride removal reaction of the chemical 26 and the contribution ratio ε _SOx [%] of the sulfur oxide removal reaction.

As for the drug 26, the molecular weight M _C are known, Scheme neutralization reaction of hydrogen chloride with drugs 26, and, Scheme neutralization reaction of sulfur oxides with agents 26 is also known. From Scheme this molecular weight _{M C,} the volume _M HCl hydrogen chloride which react with 1mol agents 26 ^[m 3 N], and the volume _M SOx sulfur oxides react with 1mol agents 26 ^[m 3 N] Can be sought.

Accordingly, the value of the amount of removed hydrogen chloride δ _HCl [m ³ N / kg] per unit weight of the chemical 26 can be calculated by the calculation of M _HCl ÷ M _C × ε _HCl ÷ 100.

Similarly, the value of the sulfur oxide removal amount ^{_{δ SOx [m 3 N / kg}} ] per unit weight of the pharmaceutical 26 _can be calculated in the calculation of _{M SOx ÷ M C × ε SOx} ÷ 100.

Therefore, the calculating device 48 has a function of receiving the measurement results of the concentration C _HCl , the concentration C _SOx , and the flow rate Qg of the exhaust gas 19 from the measuring device 47, and the hydrogen chloride removal amount δ _HCl [m ^3] per unit weight of the chemical 26. with a N / kg] and function of storing information of sulfur oxides removal amount ^{_{δ SOx [m 3 N / kg}} ], and a function of receiving the information of the agent supply amount _{W C} than drug feeder 25, further, the following (2) and (3) by calculation using the equation, and the hydrogen chloride reacted with the drug 26 flow ^{_{Q RHCl [m 3 N / h}} ], the flow rate _Q RSOx ^{[m 3} of sulfur oxides react with the drug 26 N / h].
Q _RHCl [m ³ N / h] = δ _HCl [m ³ N / kg] × W _C [kg / h] (2)
Q _RSOx [m ³ N / h] = δ _SOx [m ³ N / kg] × W _C [kg / h] (3)

Further, the calculation device 48 calculates the concentration of hydrogen chloride reacted with the chemical 26 by dividing the flow rate _QRHC obtained by the above equation (2) by the exhaust gas flow rate Qg as shown in the following equation (4). By adding the value of the measurement result of the concentration C _HCl [ppm] received from the measuring device 47 to the concentration, the exhaust gas 19 discharged from the rotary stoker type incinerator 1 and the treatment with the chemical 26 is performed. It has a function of acquiring information on the concentration of hydrogen chloride C _HCl [ppm] in the previous exhaust gas 19.
Ci _HCl [ppm] = Q _RHCl ÷ Qg + Co _HCl (4)
Here, the (4) In the formula, in order to identify the density before and after the drug treatment, Ci _HCl: concentration of hydrogen chloride before drug treatment, Co _HCl: is the concentration of hydrogen chloride after the treatment.

Further, as shown in the following equation (5), the calculation device 48 calculates the concentration of the sulfur oxide reacted with the chemical 26 by dividing the flow rate _QRSOx obtained by the above equation (3) by the exhaust gas flow rate Qg. Then, by adding the value of the measurement result of the concentration C _SOx [ppm] received from the measuring device 47 to the concentration, the exhaust gas 19 discharged from the rotary stoker type incinerator 1 and the treatment with the chemical 26 is performed. It has a function of acquiring information on the concentration C _SOx [ppm] of the sulfur oxide in the exhaust gas 19 before the emission.
Ci _SOx [ppm] = Q _RSOx ÷ Qg + Co _SOx (5)
Here, in the above equation (5), in order to identify the concentrations before and after the chemical treatment, Ci _SOx : the concentration of the sulfur oxide before the chemical treatment, and Co _SOx : the concentration of the sulfur oxide after the chemical treatment.

Incidentally, the (4) and Equation (5) is finally calculated for the concentration of _{Ci HCl} and _{Ci SOx} units in consideration is ppm, it indicates a calculation method simplified.

Therefore, the information of the concentration C _{HCl of} hydrogen chloride and the concentration C _SOx of sulfur oxides in the exhaust gas 19 discharged from the rotary stoker type incinerator 1 before the treatment with the chemical 26 is performed. For more accurate acquisition, the calculation device 48 may execute the following calculation method.

That is, the calculating device 48 converts the concentration of hydrogen chloride and the concentration of sulfur oxide after chemical treatment into a flow rate based on the measurement results of the concentration C _HCl and the concentration C _SOx received from the measuring device 47 and the exhaust gas flow rate Qg. The calculated result is added to the flow rate of hydrogen chloride before the chemical treatment and the flow rate of the sulfur oxide, and then the total is divided by the flow rate of the exhaust gas, so that the processing before the treatment with the chemical 26 is performed. Information on the concentration C _{HCl of} hydrogen chloride and the concentration C _SOx of sulfur oxides in the exhaust gas 19 is acquired.

Computing device 48, the (4) and the value of _{Ci HCl} calculated by the formula, wherein (5) the value of _{Ci SOx} calculated by the formula, chloride in the exhaust gas 19 discharged from the rotary stoker incinerator 1 A function is provided for sending to the controller 41 as information on the hydrogen concentration C _HCl and the sulfur oxide concentration C _SOx .

  Therefore, the controller 41 can perform the processing shown in FIG. 4 based on the information received from the computing device 48, similarly to the controller 41 in the first embodiment.

  Therefore, the same corrosion suppression method as that of the first embodiment can be performed by the corrosion suppression device 34 of the present embodiment, and the same effect as that of the first embodiment can be obtained.

  In addition, the corrosion suppression method and apparatus of the present disclosure are not limited to the above embodiments.

  The sizes and arrangements of the devices shown in FIGS. 1 and 5 are for convenience of illustration and do not reflect the actual arrangements and sizes of the devices.

  The controller 41 performs a determination process of step S4 following the process of step S2 shown in FIG. 4. When the determination process determines that the density coefficient has continued for the time set in the same section, , The process of step S3 may be performed, and then the process may proceed to step S5.

  In the above embodiments, the flow rate of the low-temperature fluid 37 supplied to the flow path 43 of the heat exchanger 36 is adjusted by operating the flow rate control valve 40. On the other hand, the corrosion suppression device according to the present disclosure has, for example, a configuration in which the supply unit of the low-temperature fluid 37 is configured to have a variable supply amount of the low-temperature fluid 37 by controlling the operation of the pump as the supply unit. The flow rate of the low-temperature fluid 37 supplied to the flow path 43 of the heat exchanger 36 may be adjusted by controlling the operation of the pump of the unit in accordance with a command from the controller 41. In this configuration, the supply unit functions as a flow rate adjustment unit that adjusts the supply amount of the low-temperature fluid 37 supplied to the heat exchanger 36. Even with this configuration, the corrosion suppression device of the present disclosure can obtain the same effects as those of the above embodiments.

  The corrosion suppression method and apparatus of the present disclosure are conventionally implemented or proposed as long as a rotary stoker-type incinerator of a type that supplies boiler water of a waste heat boiler to a water pipe of a stoker furnace body as cooling water is used. And any type of rotary stoker-type incinerator.

  The rotary stoker-type incinerator to which the corrosion suppression method and apparatus of the present disclosure is applied may be one that incinerates an object to be treated other than the waste 13.

  If it is expected that other metal salts other than metal chlorides and sulfates are generated inside the stoker furnace body 2 depending on the properties of the object to be incinerated in the rotary stoker type incinerator 1, The disclosed corrosion suppression device is provided with a function of measuring a concentration of a corrosive component other than hydrogen chloride and sulfur oxide in the exhaust gas related to the another metal salt, and the controller further comprises: A function for controlling the temperature of the stoker furnace body may be provided in a temperature range in which the other metal salt is not melted.

In the second embodiment, the measuring instrument 47, the concentration of hydrogen chloride is a corrosive components in the exhaust gas 19 _C HCl [ppm], the function of measuring the concentration _C SOx [ppm] of the sulfur oxides, the flow passage 20 It has a function of measuring the flow rate Qg [m ³ N / h] of the flowing exhaust gas 19, but a measuring instrument having a function of measuring the concentration of corrosive components and a measurement having a flow measuring function of the exhaust gas 19. It is good also as composition provided with a container separately.

  In addition, it goes without saying that various changes can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Rotary stoker type incinerator 2 Stalker furnace main body 5 Water pipe 16 Waste heat boiler 19 Exhaust gas 28 Cooling water supply line 31 Boiler water 35 Measuring device (concentration information acquisition device)
36 heat exchanger 37 low temperature fluid (fluid)
39 supply line 40 flow control valve (flow control unit)
41 controller 46 thermometer 47 measuring device (concentration information acquisition device)
48 Calculation device (concentration information acquisition device)
C _HCl concentration of hydrogen chloride (concentration of corrosive components)
C _SOx sulfur oxide concentration (concentration of corrosive components)
Ts target temperature

Claims (6)

A heat exchanger provided in a cooling water supply line for supplying boiler water from a waste heat boiler to a water pipe of a stoker furnace main body of a rotary stoker type incinerator;
A supply line that supplies a fluid having a lower temperature than the boiler water used for heat exchange with the boiler water to the heat exchanger;
A flow rate adjustment unit that adjusts a supply amount of the fluid supplied from the supply line to the heat exchanger,
A concentration information acquisition device that acquires information on the concentration of corrosive components in exhaust gas discharged from the rotary stoker type incinerator,
And a controller,
The controller is
A function of receiving information on the concentration of corrosive components in the exhaust gas from the concentration information acquisition device,
A target temperature setting function for setting a target temperature of the boiler water to be supplied to the water pipe based on the concentration information;
A function of giving a command to the flow rate controller based on the set target temperature of the boiler water. The controller, as the target temperature setting function, as the concentration of the corrosive component in the exhaust gas in the concentration information received from the concentration information acquisition device increases from a low state to a high state, to the water pipe of the stoker furnace body. The corrosion suppression device according to claim 1, further comprising a function of setting a target temperature of the supplied boiler water to a temperature that is sequentially reduced from a temperature of saturated water corresponding to a boiler pressure of the waste heat boiler. The controller is
The flow rate of the fluid supplied to the heat exchanger, which is required to match the temperature of the boiler water after passing through the heat exchanger with the target temperature set by the target temperature setting function, A target flow rate setting function for determining and setting the target flow rate;
The corrosion suppression device according to claim 1, further comprising: a function of giving the target flow rate set by the target flow rate setting function to the flow rate adjustment unit as a command. The concentration information acquisition device according to any one of claims 1 to 3, further comprising a function of acquiring information on a concentration of hydrogen chloride and a concentration of a sulfur oxide as the corrosive component in the exhaust gas. The corrosion control device as described. The cooling water supply line downstream of the heat exchanger includes a thermometer,
The controller supplies the measured value of the temperature of the boiler water received from the thermometer to the heat exchanger so as to match the target temperature of the boiler water set by the target temperature setting function. The corrosion suppression device according to any one of claims 1 to 4, further comprising a function of performing feedback control on the target flow rate of the fluid. A rotating stoker type incinerator, a cooling water supply line for supplying boiler water from a waste heat boiler to a water pipe of the stoker furnace main body, a heat exchanger provided in the cooling water supply line, and the boiler water in the heat exchanger. A supply line that supplies a fluid having a lower temperature, and a flow rate adjustment unit that adjusts a supply amount of the fluid that is supplied from the supply line to the heat exchanger,
A process of obtaining information on the concentration of corrosive components in the exhaust gas of the rotary stoker type incinerator,
Based on the information on the concentration of the corrosive component in the exhaust gas, as the concentration of the corrosive component increases from low to high, the target temperature of the boiler water to be supplied to the water pipe of the stoker furnace body is set to the waste temperature. A process of setting the temperature of the saturated water according to the boiler pressure of the heat boiler to a temperature gradually lowered,
A process of obtaining a flow rate of the fluid supplied to the heat exchanger, which is required to match the temperature of the boiler water after passing through the heat exchanger with the target temperature, and setting the flow rate as a target flow rate When,
Providing the set target flow rate as a command to the flow rate control unit.

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