JP5956211B2 - Operating method of pressurized fluidized furnace system - Google Patents

Description

  The present invention relates to a method for stopping a pressurized fluidized furnace system for burning an object to be treated such as sewage sludge, biomass, municipal waste, and more specifically, to completely treat an object to be treated remaining in the pressurized fluidized furnace. The present invention relates to a method for stopping a pressurized flow furnace system that suppresses generation of harmful substances by burning.

Conventionally, in order to reduce harmful substances such as carbon monoxide and dioxin generated due to incomplete combustion of the object to be processed remaining in the combustion chamber, it continues to the tip portion that supplies combustion air evenly throughout the interior of the combustion chamber. A waste combustion furnace provided with a combustion air pipe having a slit-shaped outlet has been proposed (see Patent Document 1).
In addition, a pressurized fluidized-furnace system is known as an incineration facility that focuses on effectively taking out the energy of combustion exhaust gas discharged from an incinerator by combusting sewage sludge, biomass, municipal waste, etc. Yes. The pressurized fluidized furnace system includes a pressurized fluidized furnace for burning a workpiece, a turbine rotated by combustion exhaust gas discharged from the pressurized fluidized furnace, and a turbine fixed coaxially with the turbine. The system is characterized by having a supercharger that is internally rotated and that supplies compressed air. In a pressurized flow reactor system, the turbine of the turbocharger is driven by combustion exhaust gas generated when the workpiece is completely burned, and it is necessary for combustion of the workpiece and fluidized bed flow by compressed air discharged from the compressor. Independent operation that covers all the combustion air is possible. It has been known that since the self-sustained operation is possible, the conventionally required flow blower and induction fan are unnecessary, and the running cost is reduced (see Patent Document 2).

JP-A-7-208716 JP 2005-28251 A

However, the supply device for supplying combustion air to the combustion air pipes described in Patent Documents 1 and 2 is one that is normally used, and if the supply device malfunctions, there is no backup mechanism, so there is no combustion chamber. The supply of combustion air to the combustion chamber is interrupted, and the object to be treated remaining in the combustion chamber burns incompletely, and harmful substances such as carbon monoxide and dioxin resulting from incomplete combustion may be discharged outside the equipment. was there.
In addition, in the supercharged flow facility, combustion air is supplied by using the combustion exhaust gas of the object to be processed. Therefore, when there is no need to operate the means for supplying the object to be processed or when the facility is shut down When the supply device for the processing object stops, the driving force of the turbine decreases due to a rapid decrease in the amount of combustion exhaust gas, and the conveying force of the combustion air to be supplied by the compressor decreases rapidly. Combustion air supplied to the fuel is reduced, the object to be treated remaining in the pressurized flow is incompletely burned, and harmful substances such as carbon monoxide and dioxin may be discharged out of the facility.

  Therefore, the main problem of the present invention is to eliminate such problems.

The present invention and effects obtained by solving the above problems are as follows.
That is, the first invention provides a workpiece supply apparatus for supplying a workpiece to a pressurized fluidized furnace for burning the workpiece, and a turbine rotated by combustion exhaust gas discharged from the pressurized fluidized furnace. A turbocharger that is rotated with the rotation of the turbine and supplies a combustion air to the pressurized fluidized furnace, and a compressor that branches off from the flow path to the compressor suction side of the turbocharger during startup Air is supplied to the pressurized fluidized furnace through a bypass flow passage arranged between the flow passage on the side and air is supplied to the compressor of the supercharger , and the combustion exhaust gas supplied to the turbine is A starter blower that stops after the temperature of the pressurized fluidized furnace reaches a predetermined temperature, and a first concentration meter that measures the unburned gas concentration in the combustion exhaust gas discharged from the pressurized fluidized furnace and oxygen Measure concentration A method of operating a pressurized fluid Douro system with two densitometer,
The Restart startup blower on condition stopping the quantitative feeder feeder of the object, of the startup blower and poured pump stops supplying device after a restart to the pressurized flow reactor of the object Stop supplying , supplying air from the starter blower to the compressor of the supercharger ,
Combustion air supplied from the compressor to the pressurized flow furnace is less than 50% of the rated capacity, the unburned gas concentration is a predetermined set value or more, or the pressure of the compressed air discharged from the starter blower is discharged from the compressor. When the pressure is higher than the pressure of the combustion air, the bypass flow path is opened and air is supplied from the starter blower to the pressurized flow furnace via the bypass flow path when the pressure falls within at least one characterized in that it.

(Function and effect)
Restart startup blower on condition stopping the quantitative feeder feeder of the object, the supply of the start-up blower is stopped poured pump feeder after restart and the pressurized flow reactor of the object And the air is supplied from the starter blower to the compressor of the supercharger, so that it is necessary for the combustion of the workpiece remaining in the pressurized fluidized furnace regardless of the amount of combustion exhaust gas generated in the pressurized fluidized furnace. It is possible to supply a sufficient amount of combustion air, to completely burn the remaining object to be processed, and to suppress generation of harmful substances due to incomplete combustion of the object to be processed.

Less than 50% of the combustion air is rated capacity supplied from the Compressor in pressurized fluidized furnace, unburned gas concentration equal to or higher than a predetermined value, or the pressure of the compressed air discharged from the startup blower from said compressor When the pressure exceeds the pressure of the exhausted combustion air, if at least one of the conditions is met, air is supplied directly from the starter blower to the pressurized flow furnace without going through the compressor of the supercharger. It is possible to completely burn the object to be processed remaining in the pressurized fluidized furnace without consuming a large blowing power.

The second invention is characterized in that, in addition to the configuration of the first invention, the drive of the starter blower is stopped after the measured value of the first densitometer falls below a predetermined value or a predetermined set value.

(Function and effect)
After the measured value of the first densitometer reaches a constant value or falls, the driving of the starter blower is stopped, so that harmful substances can be prevented from being discharged outside the pressurized fluidized furnace system.

The third invention is characterized in that, in addition to the configuration of the second invention, the driving of the starter blower is stopped after the measured value of the second densitometer becomes substantially the same value as the oxygen concentration in the air. .

(Function and effect)
After the measured value of the second densitometer is almost the same as the oxygen concentration in the air, the start-up blower is stopped, so that it is possible to further improve the hazardous substance discharge prevention performance of the pressurized flow furnace system. .

According to a fourth aspect of the invention, in addition to the configuration of the invention according to any one of the first to third aspects , the first concentration meter is a carbon monoxide concentration meter or a dioxin concentration meter.

(Function and effect)
The concentration of carbon monoxide and dioxin generated due to incomplete combustion of the workpiece can be reliably measured.

  According to the above invention, even when the supply of the workpiece is stopped, the workpiece in the pressurized fluidized furnace can be processed without incomplete combustion.

It is explanatory drawing of a pressurized flow furnace system. It is the elements on larger scale of FIG. It is the elements on larger scale of FIG. It is the elements on larger scale of FIG. It is explanatory drawing of a control apparatus. It is a flowchart of the auxiliary supply apparatus of combustion air. It is a flowchart of an operation method. It is a flowchart of another driving | operation method.

  Hereinafter, this embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, in order to make an understanding easy, although it showed and demonstrated the direction for convenience, the structure is not limited by these.

  As shown in FIG. 1, the pressurized fluidized furnace system 1 includes a storage device 10 that stores an object to be processed such as sludge, a pressurized fluidized furnace 20 that combusts the object to be processed supplied from the storage device 10, An air preheater 40 for heating the combustion air supplied to the pressurized fluidized furnace 20 by the combustion exhaust gas discharged from the pressure fluidized furnace 20, a dust collector 50 for removing dust and the like in the combustion exhaust gas, and pressurization driven by the combustion exhaust gas A supercharger 60 for supplying combustion air to the fluidized furnace 20, a white smoke prevention preheater 70 for heating the white smoke prevention air supplied to the flue gas treatment tower 80 by the combustion exhaust gas discharged from the supercharger 60, and And a flue gas treatment tower 80 for removing impurities in the combustion exhaust gas.

(Storage device)
The object to be processed stored in the storage device 10 is mainly sewage sludge dehydrated to a moisture content of 70 to 85% by mass, and the object to be processed contains combustible organic substances. In addition, if a to-be-processed object is a water-containing organic substance, it will not be restrict | limited to a sewage sludge, Biomass, municipal waste, etc. may be sufficient.

  A fixed amount feeder 11 for supplying a predetermined amount of the object to be processed to the pressurized fluidized furnace 20 is disposed in the lower part of the storage device 10, and the object to be processed is pumped to the pressurized fluidized furnace 20 on the downstream side of the quantitative feeder 11. A dosing pump 12 is provided. As the input pump 12, a single screw pump, a piston pump or the like can be used. The supply device in the present invention may be either the metering feeder 11 or the charging pump 12, and the metering feeder 11 and the charging pump 12 may be integrated.

(Pressurized flow furnace)
The pressurized fluidized furnace 20 is a combustion furnace having a predetermined particle size as a fluidized medium and filled with solid particles such as fluidized sand in the lower part of the furnace. The material to be processed supplied from the outside and auxiliary fuel supplied as necessary are burned while maintaining the fluid state of the sand layer.
As shown in FIGS. 1 and 2, an auxiliary fuel combustion device 21 for heating the fluidized sand having a particle size of about 400 to 600 μm filled in the pressurized fluidized furnace 20 is disposed at the lower part of the side wall on one side. A starting burner 22 that heats the fluidized sand at the time of starting is disposed in a portion in the vicinity of the upper side of the auxiliary fuel combustion device 21, and a workpiece supply port 13 </ b> B is provided in an upper portion of the starting burner 22. ing.
In addition, a water gun 23 for cooling the combustion exhaust gas is disposed on the upper part of the pressurized fluidized furnace 20, and cooling water can be sprayed into the furnace as necessary.

  The auxiliary fuel combustion device 21 is provided with a plurality of auxiliary fuels on the upper side of the dispersion pipe (combustion air supply pipe) 24 similarly to the combustion air supply pipe 24 in order to heat the fluidized sand filled in the pressurized fluidized furnace 20. Combustion devices 21 are arranged in parallel. The auxiliary fuel combustion device 21 is supplied with auxiliary fuel such as city gas or heavy oil from an auxiliary fuel supply device 29 installed outside the furnace. A gas gun or an oil gun can be used as the auxiliary fuel combustion device 21.

  The starting burner 22 is disposed so as to fall and incline toward the center of the pressurized fluidized furnace 20 in order to heat the upper surface of the fluidized sand at the time of starting. Similar to the auxiliary fuel combustion device 21, the auxiliary burner 22 is supplied with auxiliary fuel from an auxiliary fuel supply device 29 outside the furnace. The combustion air of the starter burner 22 is covered by the blown air generated by the starter blower 65 through the pipe 96.

  A combustion air supply pipe 24 for supplying combustion air for supplying oxygen used for fluidized bed flow and combustion is disposed inside the pressurized fluidized furnace 20 below the side wall on the other side of the pressurized fluidized furnace 20. Yes. The thinned side wall at the top of the pressurized fluidized furnace 20 is heated with combustion gas generated by the combustion of the auxiliary fuel, the object to be processed, sand filtered water, water existing in the object to be processed, etc. A discharge port 90 </ b> A is formed for discharging the water vapor generated in step 1 to the outside of the furnace. In the present invention, combustion gas or a gas in which combustion gas and water vapor are mixed is referred to as combustion exhaust gas.

The combustion air supply pipe 24 is disposed below the auxiliary fuel combustion device 21 in order to supply combustion air evenly to the auxiliary fuel supplied from the auxiliary fuel combustion device 21.
A plurality of temperature sensors (not shown) for measuring the in-furnace temperature are installed on the side wall of the pressurized flow furnace 20 at predetermined intervals along the height direction. The installation locations are a sand layer and a free board portion, and there are 2 to 3 locations, respectively, for a total of 4 to 6 locations. A thermocouple or the like can be used as the temperature sensor. Here, the free board portion refers to the upper layer portion of the sand layer in the pressurized fluidized bed combustion furnace 11. These temperature sensors output an electrical signal indicating the temperature in the furnace at each installation position to the control device 100.

(Air preheater)
The air preheater 40 is installed at the rear stage of the pressurized fluidized furnace 20 and indirectly exchanges heat between the combustion exhaust gas discharged from the pressurized fluidized furnace 20 and the combustion air, thereby raising the combustion air to a predetermined temperature. It is a device that warms up.
As shown in FIGS. 1 and 3, the air preheater 40 has a combustion exhaust gas supply port 90 </ b> B from the pressurized fluidized furnace 20 formed at the upper portion of one side wall, and a lower vicinity portion of the supply port 90 </ b> B. Is formed with a discharge port 91 </ b> A through which combustion air is discharged from the air preheater 40. The combustion exhaust gas supply port 90 </ b> B is connected to the discharge port 90 </ b> A of the pressurized fluidized furnace 20 through the pipe 90, and the combustion air exhaust port 91 </ b> A is supplied to the combustion air of the pressurized fluidized furnace 20 through the tube 91. Connected to the rear of the tube 24.

  A discharge port 92A for discharging the combustion exhaust gas to the outside of the device is formed in the lower part on the other side of the air preheater 40, and a supply port 95B for supplying the combustion air into the device is provided in the vicinity of the upper side of the discharge port 92A. Is formed. As the air preheater, a shell and tube heat exchanger is preferable.

(Dust collector)
The dust collector 50 is provided in the subsequent stage of the air preheater 40 and is a device that removes impurities such as dust and finely divided fluidized sand contained in the combustion exhaust gas delivered from the air preheater 40.
As a filter installed in the dust collector 50, for example, a ceramic filter or a bag filter can be used. In the dust collector 50, a supply port 92B for supplying combustion exhaust gas into the device is formed in a lower portion of one side wall. In the upper part, a discharge port 93A for discharging clean combustion exhaust gas from which impurities and the like have been removed to the outside of the device is formed. The combustion exhaust gas supply port 92 </ b> B is connected to the combustion exhaust gas discharge port 92 </ b> A of the air preheater 40 through a pipe 92.

  Inside the dust collector 50, a vacuum filter (not shown) is provided at a portion between the supply port 92B formed in the lower portion and the discharge port 93A formed in the upper portion in the vertical direction. Impurities and the like in the combustion exhaust gas removed by the filter are temporarily stored at the bottom in the dust collector 50 and then periodically discharged to the outside.

(Supercharger)
The supercharger 60 is provided in the subsequent stage of the dust collector 50, and is configured to be rotated by the combustion exhaust gas delivered from the dust collector 50, a shaft 63 that transmits the rotation of the turbine 61, and the same axis as the turbine. The compressor 62 is configured to generate compressed air when the rotation is transmitted by the shaft 63. The generated compressed air is supplied to the pressurized fluidized furnace 20 as combustion air.
A supply port 93 </ b> B for supplying clean combustion exhaust gas from which impurities have been removed by the dust collector 50 into the apparatus is formed in a lower portion of the side wall of the turbocharger 60 on the turbine 61 side (a portion orthogonal to the shaft 63). On the downstream side of the side wall (portion parallel to the shaft 63), a discharge port 97A for discharging combustion exhaust gas to the outside of the device is formed. A clean combustion exhaust gas supply port 93 </ b> B is connected to a discharge port 93 </ b> A of the dust collector 50 through a pipe 93.

  On the upstream side of the side wall on the compressor 62 side of the supercharger 60 (part parallel to the shaft 63), a supply port 67B for sucking air into the equipment is formed, and above the side wall on the turbine 61 side (perpendicular to the shaft 63). A discharge port 94A for discharging compressed air obtained by increasing the pressure of the sucked air to 0.05 to 0.3 MPa is formed in the device. The air supply port 67 </ b> B sucks air through the pipes 16 and 67. Further, it is also connected to an activation blower 65 for supplying combustion air to the pressurized fluidized furnace 20 at the time of startup via pipes 66 and 67. On the other hand, the compressed air discharge port 94 </ b> A is connected to the supply port 95 </ b> B of the air preheater 40 via the pipes 94, 95 and to the rear part of the starting burner 22 of the pressurized fluidized furnace 20 via the pipes 94, 96. Yes. A pipe 94 or 95 connected to the compressed air discharge port is provided with a first pressure sensor 111 that measures the pressure of the compressed air (combustion air) discharged from the compressor 62. The pressure measured here is output to the control device 100 and used for opening / closing control of the damper 68C.

(Starting blower)
The starter blower 65 is a device that supplies combustion air to the starter burner 22 and the combustion air supply pipe 24 of the pressurized fluidized furnace 20 when the pressurized fluidized furnace system 1 is started. Further, the starter blower 65 reduces the water vapor generated in the pressurized fluidized furnace 20 due to the interruption of the supply of the object to be processed from the storage device 10, and the rotational speed of the turbine 61 of the supercharger 60 is reduced. Therefore, when the intake of the outside air by the compressor 62 is reduced, it has a function of forcibly supplying the outside air to the compressor 62 via the pipes 66 and 67.
The starter blower 65 is connected to the rear portion of the starter burner 22 disposed in the pressurized fluidized furnace 20 via pipes 66, 68, 96, and the combustion air of the air preheater 40 is connected via the pipes 66, 68, 95. Is connected to the supply port 67B of the compressor 62 of the supercharger 60 via pipes 66 and 67. The pipe 66 is provided with a second pressure sensor 112 that measures the discharge pressure of the activation blower 65. The pressure measured here is output to the control device 100 and used for opening / closing control of the damper 68C.

  In the middle part of the pipe 68, a damper 68 </ b> C that communicates a part of the pipe 68, which is a bypass passage, far from the connection point with the pipe 67 as viewed from the starter fan 65, and the connection side of the pipe 68 and the pipe 94 A check valve 68D for preventing the backflow of gas is disposed. The damper 68C communicates the pipe 68 from the time when the pressurized fluidized furnace 20 is started (when the starter burner 22 is ignited) until the temperature rise of the pressurized fluidized furnace 20 is completed. The pipe 68 is shut off. That is, from the start of the pressurized fluidized furnace 20 to the completion of the temperature rise of the incinerator, the pressurized fluidized furnace 20 from the starter blower 65 via the starter burner 22 and the air preheater 40 of the pressurized fluidized furnace 20. The combustion air is supplied to the combustion air supply pipe 24, and the combustion air is also supplied to the compressor 62 side of the supercharger 60 through the pipe 67 which is an unclosed air flow path. After that, by closing the damper 68C, the combustion air is supplied from the compressor 62 of the supercharger 60 to the combustion air supply pipe 24 of the pressurized fluidized furnace 20 via the air preheater 40.

(Preheater for white smoke prevention)
The white smoke prevention preheater 70 prevents the white smoke of the combustion exhaust gas discharged from the chimney 87 to the outside, and the white smoke prevention supplied from the combustion exhaust gas discharged from the supercharger 60 and the white smoke prevention fan. It is a device that indirectly exchanges heat with industrial air. By the heat exchange, the combustion exhaust gas is cooled and the white smoke prevention air is heated. The flue gas that has been heat-exchanged and cooled by the white smoke prevention preheater 70 is sent to the subsequent flue gas treatment tower 80. A shell and tube heat exchanger, a plate heat exchanger, or the like can be used as the white smoke preventing preheater 70.

(Smoke exhaust treatment tower)
The flue gas treatment tower 80 is a device that prevents discharge of impurities and the like contained in the combustion exhaust gas outside the equipment, and a chimney 87 is disposed on the upper part of the flue gas treatment tower 80.
As shown in FIGS. 1 and 4, the flue gas treatment tower 80 has a supply port 98 </ b> B for supplying the combustion exhaust gas discharged from the white smoke prevention preheater 70 into the apparatus at the lower part of the side wall on one side. In addition, a supply port 99B is formed in the lower portion of the side wall on one side of the chimney 87 to supply the white smoke prevention air, which is heated and discharged from the white smoke prevention preheater 70 and exchanged with the exhaust gas, into the chimney 87. ing. The combustion exhaust gas supply port 98B is connected to a combustion exhaust gas discharge port 98A formed in the lower portion of the white smoke prevention preheater 70 via a pipe 98, and the white smoke prevention air supply port 99B is connected to the pipe. 99 is connected to a white smoke prevention air discharge 99 </ b> A formed in the upper part of the white smoke prevention preheater 70. The white smoke prevention air of the white smoke prevention preheater 70 is supplied to the white smoke prevention preheater 70 via the pipe 103 by the white smoke prevention air blower 101 and indirectly exchanged with the combustion exhaust gas. It is heated and discharged from the discharge port 99A. In the chimney 87, the combustion exhaust gas at the outlet, which tends to be wet and condensed in the air, is mixed with warm and dry white smoke prevention air at the supply port 99B to reduce the relative humidity of the combustion exhaust gas. To prevent white smoke.

  A spray pipe 84 for spraying water supplied from the outside into the apparatus is arranged on the upper side wall on the other side of the flue gas treatment tower 80, and the intermediate part and the lower part are respectively connected via a circulation pump 83. A spray pipe 85 for spraying caustic soda water containing caustic soda stored at the bottom of the flue gas treatment tower 80 into the apparatus is disposed. Further, the caustic soda water stored in the flue gas processing tower 80 is supplied from a caustic soda tank (not shown) via a caustic soda pump (not shown), and is always maintained at an appropriate amount.

  The combustion exhaust gas supplied to the flue gas treatment tower 80 is mixed with white smoke prevention air after removing impurities and the like, and is discharged from the chimney 87 to the outside.

(Auxiliary supply device for combustion air)
The auxiliary supply device for the combustion air includes a switch 11C for operating the driving state of the quantitative feeder 11 which is a supply device for the object to be processed, a switch 65C for operating the driving state of the starter blower 65, and a pipe 68 which is a bypass flow path. 68C, a carbon monoxide concentration meter (first concentration meter) 98C for measuring the capacity of carbon monoxide and oxygen contained in the combustion exhaust gas whose temperature has been recovered by the air preheater 40, etc. A densitometer (second densitometer) 98D and a control device 100 that controls the output state corresponding to the input state.

  In the present embodiment, the quantitative feeder 11 of the storage device 10 is mounted with a switch 11C for operating the driving state of the quantitative feeder 11, and the activation blower 65 operates the driving state of the activation blower 65. A switch 65C is mounted. Further, in order to measure the carbon monoxide and oxygen content contained in the combustion exhaust gas, a pipe 98 for connecting the white smoke prevention preheater 70 and the smoke treatment tower 80 and flowing the combustion exhaust gas at a relatively low temperature is provided. In addition, a carbon monoxide concentration meter 98C and an oxygen concentration meter 98D are arranged. Further, the damper 68C includes an electric actuator and opens and closes by an output signal of the control device 100.

  As shown in FIG. 5, the switch 11C, the carbon monoxide concentration meter 98C, and the oxygen concentration meter 98D are connected to the input side of the control device 100 via a signal line, and the output side of the control device 100 has a signal A switch 65C and a damper 68C are connected via a line.

(how to drive)
Next, an operation method using the auxiliary supply device for combustion air when supply of the workpiece is stopped will be described.
When a signal is input to the control device 100 when the switch 11C is opened (driving of the quantitative feeder 11 is stopped), as shown in FIG. In order to reduce harmful substances such as carbon monoxide generated from the control device 100, an operation signal of the starter blower 65 is output from the control device 100 and the switch 65C is connected to drive the starter blower 65, and the compressor 62, air Combustion air is supplied to the combustion air supply pipe 24 of the pressurized fluidized furnace 20 via the preheater 40 or the like. As described above, the start condition of the starter blower 65 is set to stop the driving of the quantitative feeder 11. For example, when the measured value of the carbon monoxide concentration meter 98C is equal to or higher than a predetermined set value, the starter is discharged from the compressor 62. The case where combustion air becomes less than 50% of a rated capacity etc. can also be added as additional starting conditions. In the present embodiment, the driving signal of the starter blower 65 is output after the driving of the quantitative feeder 11 is stopped. However, for example, a timer is provided in the control device 100, and the driving of the quantitative feeder 11 is stopped after a certain time has elapsed from the stop. An operation signal can be output to the starter blower 65.

  When there is no change in the measured value of the carbon monoxide concentration meter 98C and the measured value of the oxygen concentration meter 98D is from 18 vol% or more to 21 vol% equivalent to the oxygen concentration in the atmosphere, the controller 100 starts the blower 65 for starting. When the stop signal is output and the switch 65C is opened, the driving of the starter blower 65 is stopped. Further, the mounting positions of the carbon monoxide concentration meter 98C and the oxygen concentration meter 98D are not limited to the piping 98, and can be arranged in the piping 90, 92, 93, 97 by taking heat countermeasures. .

(Other driving methods)
Next, an operation method when the pressurized fluidized furnace system 1 is lowered will be described below.
As shown in FIG. 7, driving of the quantitative feeder 11 and the input pump 12 of the storage device 10 that is a supply device is stopped, and supply of the object to be processed from the storage device 10 into the pressurized fluidized furnace 20 is stopped. By stopping the supply of the object to be processed, the combustion exhaust gas discharged from the pressurized fluidized furnace 20 is reduced, and the rotation of the turbine 61 of the supercharger 60 is gradually reduced and discharged from the compressor 62. Both the flow rate and pressure of combustion air are gradually reduced. On the other hand, the starter blower 65 is restarted in response to the stop of the workpiece supply apparatus. Combustion air supplied from the start-up blower 65, the Compressor 62 supplies combustion air to the combustion air supply pipe 24 the pressurized fluidized furnace 20 via the air preheater 40 and the like.

  Next, when at least one of the following conditions is satisfied, the pipe 68 serving as a bypass flow path is opened, and the combustion air supplied from the starter blower 65 passes through the pipe 68 as a combustion air supply pipe. 24. The first condition is when the combustion air discharged from the compressor 62 becomes less than 50% of the rated capacity. The second condition is when the concentration of unburned gas such as carbon monoxide and dioxin contained in the combustion exhaust gas exceeds a preset value. The unburned gas concentration may be measured by a measuring device appropriately provided on the combustion exhaust gas line. The third condition is when the pressure of the combustion air discharged from the starter blower 65 is higher than the pressure of the combustion air discharged from the compressor 62. In addition, the discharge pressure of 65 of the starter blower may be measured by the second pressure sensor 112, and the pressure of the combustion air discharged from the compressor 62 may be measured by the first pressure sensor 111, and output from these sensors. The value obtained by the control device 100. When at least one of these conditions is satisfied, the combustion air supplied from the starter blower 65 passes through the pipes 66, 68, 95, the air preheater 40, and the pipe 91 at the rear of the combustion air supply pipe 24. To be supplied. The gate valve 66 </ b> C arranged in the pipe 66 is interlocked with an operation signal for operating the starter blower 65 output from the control device 100 and opened, and the pipe 66 communicates with the pipe 68. The damper 68C is opened / closed by the output signal of the control device 100, and is opened when the at least one of the three conditions is satisfied, and the pipe 68 communicates. As a result, the object to be processed remaining in the pressurized fluidized furnace 20 can be completely burned.

  Next, the object to be treated remaining in the pressurized fluidized furnace 20 is completely burned, and the measured value of the carbon monoxide concentration meter 98C falls below a preset value, and the oxygen concentration meter 98D is equivalent to the oxygen concentration in the atmosphere. After reaching 21% or more, the driving of the starter blower 65 is stopped. The gate valve 66 </ b> C disposed in the pipe 66 is interlocked with a stop signal for stopping the starter blower 65 output from the control device 100 and closed, and the pipe 66 is closed and disposed in the pipe 68. The damper 68C is closed by the stop signal of the starter blower 65 from the control device 100, and the pipe 68 is closed.

Next, an operation method when the supply of the workpiece is stopped during the operation of the pressurized fluidized furnace system 1 will be described.
As shown in FIG. 8, by starting the starter blower 65 after the driving of the quantitative feeder 11 of the storage device 10 is stopped, the object to be processed remaining in the pressurized fluidized furnace 20 is completely burned, and the object to be processed This is a stopping method that can prevent the generation of harmful substances such as carbon monoxide generated by incomplete combustion.

  After the metering feeder 11 stops driving, the starter blower 65 is started, and combustion air is supplied from the starter blower 65 to the compressor 62. The quantitative feeder 11 stops the drive by opening the switch 11C and stops driving, but causes the control device 100 to input a signal indicating that the switch 11C is opened. The combustion air discharged from the starter blower 65 is supplied to the compressor 62 through the pipes 66 and 67, and is pressurized by the rotating compressor 62, and then the pipes 94, 96, and 95, the air preheater 40, and the pipe 91. To the rear part of the combustion air supply pipe 24. The gate valve 66 </ b> C disposed in the pipe 66 is interlocked with an operation signal for operating the starter blower 65 output from the control device 100 to be opened, and the pipe 66 communicates.

  For example, combustion air supplied from the compressor 62 to the combustion air supply pipe 24 by starting the starter blower 65 and supplying combustion air from the starter blower 65 to the compressor 62 after the fixed quantity feeder 11 is stopped. Even in a case where the amount of gas is reduced, the object to be processed remaining in the supercharger 60 is completely burned by the combustion air supplied from the starter blower 65, and carbon monoxide generated by incomplete combustion of the object to be processed The generation of harmful substances can be prevented.

  Next, the driving of the charging pump 12 of the storage device 10 is stopped, and the supply of the object to be processed from the charging pump 12 into the pressurized flow furnace 20 is stopped. By stopping the supply of the object to be processed, the combustion exhaust gas discharged from the pressurized fluidized furnace 20 is reduced, and the rotation of the turbine 61 of the supercharger 60 is gradually reduced and discharged from the compressor 62. Combustion air gradually decreases.

  Next, when at least one of the following conditions is satisfied, the combustion air supplied from the starter blower 65 opens the pipe 68 which is a bypass flow path, and the combustion air supply pipe is connected via the pipe 68. 24. The first condition is when the combustion air discharged from the compressor 62 becomes less than 50% of the rated capacity. The second condition is when the concentration of unburned gas such as carbon monoxide and dioxin contained in the combustion exhaust gas exceeds a preset value. The unburned gas concentration may be measured by a measuring device appropriately provided on the combustion exhaust gas line. The third condition is when the discharge pressure of the starter blower 65 is higher than the pressure of the combustion air discharged from the compressor 62. When at least one of these conditions is satisfied, the combustion air supplied from the starter blower 65 is supplied to the combustion air supply pipe 24 via the pipes 66, 68, 95, the air preheater 40, and the pipe 91. Supplied to the rear. The gate valve 66 </ b> C arranged in the pipe 66 is interlocked with an operation signal for operating the starter blower 65 output from the control device 100 and opened, and the pipe 66 communicates with the pipe 68. The damper 68C is opened and closed by an output signal of the control device 100, and the pipe 68 communicates when at least one of the three conditions is satisfied. As a result, the object to be processed remaining in the pressurized fluidized furnace 20 can be completely burned.

  Next, after the object to be processed remaining in the pressurized fluidized furnace 20 is completely burned, the driving of the starter blower 65 is stopped. The gate valve 66 </ b> C disposed in the pipe 66 is interlocked with a stop signal for stopping the starter blower 65 output from the control device 100 and closed, and the pipe 66 is closed and disposed in the pipe 68. The damper 68C is closed by the stop signal of the starter blower 65 from the control device 100, and the pipe 68 is closed.

DESCRIPTION OF SYMBOLS 1 Pressurized flow furnace system 10 Storage apparatus 11 Fixed feeder 12 Charge pump 20 Pressurized flow furnace 21 Auxiliary fuel combustion apparatus 22 Starter burner 24 Combustion air supply pipe 60 Supercharger 61 Turbine 62 Compressor 65 Start blower 70 White smoke prevention Preheater 80 Flue gas treatment tower 87 Chimney 98C Carbon monoxide concentration meter (first concentration meter)
98D oxygen concentration meter (second concentration meter)
100 Control device

Claims (4)

With the supply of the workpiece to be supplied to the pressurized fluidized furnace for burning the workpiece, the turbine rotated by the combustion exhaust gas discharged from the pressurized fluidized furnace, and the rotation of the turbine Between the turbocharger that is rotated and houses the compressor that supplies combustion air to the pressurized flow furnace, and the flow path to the compressor suction side of the supercharger that branches off from the flow path to the compressor suction side at startup In addition to supplying air to the pressurized fluidized furnace via a bypass flow path disposed in the compressor , air is supplied to the compressor of the supercharger, and the combustion exhaust gas supplied to the turbine reaches a predetermined temperature, and A starter blower that stops after the pressure fluidized furnace is heated, a first concentration meter that measures the unburned gas concentration in the combustion exhaust gas discharged from the pressurized fluidized furnace, and a second concentration that measures the oxygen concentration Pressurization with meter Douro method of operating a system,
The Restart startup blower on condition stopping the quantitative feeder feeder of the object, of the startup blower and poured pump stops supplying device after a restart to the pressurized flow reactor of the object Stop supplying , supplying air from the starter blower to the compressor of the supercharger ,
Combustion air supplied from the compressor to the pressurized flow furnace is less than 50% of the rated capacity, the unburned gas concentration is a predetermined set value or more, or the pressure of the compressed air discharged from the starter blower is discharged from the compressor. When the pressure is higher than the pressure of the combustion air, the bypass flow path is opened and air is supplied from the starter blower to the pressurized flow furnace via the bypass flow path when the pressure falls within at least one A method of operating a pressurized fluidized-furnace system characterized by: After said measurement of the first concentration meter is lowered than a predetermined value or a predetermined setting value, a method of operating a pressurized fluid Douro system of claim 1, wherein the stops driving of the start-up blower. The method of operating a pressurized flow furnace system according to claim 2 , wherein the driving of the starter blower is stopped after the measured value of the second densitometer becomes substantially the same as the oxygen concentration in the air. The operating method of the pressurized fluidized furnace system according to any one of claims 1 to 3, wherein the first concentration meter is a carbon monoxide concentration meter or a dioxin concentration meter.

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