WO2008038492A1

WO2008038492A1 - Operating method and operation control apparatus for gasification melting furnace

Info

Publication number: WO2008038492A1
Application number: PCT/JP2007/067003
Authority: WO
Inventors: Hiroyuki Hosoda; Koji Minakawa; Tadashi Ito; Hiroo Nikaido
Original assignee: Kobelco Eco-Solutions Co., Ltd.
Priority date: 2006-09-26
Filing date: 2007-08-31
Publication date: 2008-04-03
Also published as: EP2322855A3; PL2068081T3; EP2068081B1; KR101107787B1; PL2322855T3; KR20090057441A; EP2068081A4; EP2068081A1; EP2322855A2; ES2461769T3; EP2322855B1

Abstract

[PROBLEMS] 1. To realize high-efficiency operation of a gasification melting furnace by cessation of an auxiliary burner and, at the same time, to avoid abnormal combustion of unburned gas in reignition of the auxiliary burner. 2. To facilitate the regulation of the basicity to a proper value without the need to use a special analyzer for a slag composition in the operation of a gasification melting furnace. [MEANS FOR SOLVING PROBLEMS] 1. In a gasification melting furnace, the operation of a burner of the melting furnace is stopped when the operation state satisfies a predetermined requirement. Thereafter, when the temperature in the vicinity of the burner is lowered to a predetermined temperature, the supply of a waste material from a dust feeder to the gasification furnace is stopped. This burner is reignited when the concentration of oxygen in gas in the outlet of the gasification furnace is increased by stopping the supply of the waste material to the gasification furnace. 2. The basicity of slag discharged from a slag-discharge port in a melting furnace is adjusted by supplying a basicity adjuster from an apparatus for supplying the basicity adjuster. Correlation between a parameter corresponding to the calorific value of the waste material per unit weight and the slag basicity is used to determine the amount of the basicity adjuster supplied.

Description

Specification

Operation method and operation control apparatus for gasification melting furnace

Technical field

TECHNICAL FIELD [0001] The present invention relates to an operation method and operation control device for a gasification melting furnace for treating waste such as municipal waste and industrial waste, and also relates to slag discharged from the gasification melting furnace. The present invention relates to a method and an apparatus for adjusting basicity.

Background art

Conventionally, for example, a fluidized bed gasification melting furnace as described in Patent Document 1 is known as a means for treating waste. This fluidized bed type gasification and melting furnace includes a fluidized bed type gasification furnace in which a fluidized bed is formed by the fluidized gas and a subsequent stage melting furnace. The fluidized bed gasifier partially burns the waste introduced into the fluidized bed to generate pyrolysis gas. The melting furnace further burns the pyrolysis gas generated by the fluidized bed gasification furnace to melt ash in the gas to generate slag. At the top of the melting furnace, an auxiliary burner is installed to maintain the furnace temperature.

[0003] The operation of such a gasification melting furnace has the following problems to be solved.

[0004] 1) About PANA operation

In the gasification melting furnace, if the temperature in the melting furnace has reached about 1300 ° C, the temperature in the furnace will remain for a while due to self-combustion of unburned components even if the operation of the auxiliary burner is stopped in that state. Kept at high temperature. Therefore, fuel savings and environmental issues (especially CO emissions)

2) From the viewpoint of suppression, it is desirable to stop the operation of the above-mentioned PANA as appropriate.

[0005] However, once the operation of the PANA is stopped in this way, good combustion may not be resumed during subsequent re-ignition. For example, when the temperature of the furnace in the vicinity of the burner rapidly decreases for some reason after the operation of the burner stops, and the temperature of the unburned gas in the vicinity of the burner falls below the self-ignition temperature of the burner, the burner is reignited. Then, abnormal combustion may occur.

[0006] 2) Fluidity of slag

In the gasification melting furnace as described above, the slag is stably discharged from the slag discharge port. In order to keep the bag, it is important to maintain its fluidity. If the slag fluidity continues to decline, this slag may block the slag outlet and hinder continuous operation.

[0007] As parameters governing the fluidity of the slag, the temperature and basicity (C aO / SiO) of the slag exist. In order for the slag to maintain its fluidity, the slag

2

The temperature is higher than the melting point, and there is a significant correlation between the melting point and the basicity of the slag. Specifically, when the basicity of the slag exceeds about 0.7, the melting point of the slag increases with the increase. For example, when the basicity of the slag is 1, the melting point of the slag is 1200 It is known to reach up to ° C.

[0008] Therefore, in order to efficiently perform a stable continuous operation of the gasification melting furnace, it is important to adjust the basicity of the slag. Even if operation is performed to maintain the inside of the melting furnace at a substantially constant temperature, the fluidity of the actual slag is affected by fluctuations in its basicity, so the basicity of the slag is maintained within an appropriate range. Otherwise, stable operation is difficult. In addition, if the in-furnace operating temperature is set high in anticipation of such basicity fluctuations, a reduction in operating efficiency cannot be avoided. For example, when the basicity of the slag reaches 1, the temperature of the slag must be 1200 ° C or higher in order for the slag to be stably discharged from the slag discharge port. Moreover, since the temperature of the discharged slag tends to be 100 to 150 ° C lower than the furnace temperature of the melting furnace, after all, the temperature in the melting furnace is set to 1350 to stabilize the output of the slag. It must be above ° C. Continuing such high-temperature operation over a long period of time is not only necessary for increasing the amount of external fuel to keep the temperature in the furnace, but also incurring an increase in the environmental burden and increasing the running cost. An increase in repair costs can also result.

Therefore, conventionally, in order to adjust the basicity of the slag, a basicity adjusting agent has been supplied into the system. Specifically, when reducing the basicity, cinnabar (SiO 2)

2 is supplied, and conversely, when raising the basicity, slaked lime (Ca (OH)) is supplied. This

2

The basicity of the slag is kept within a preferable range by supplying an appropriate amount of such a basicity adjusting agent into the system. In other words, it is an indispensable condition for accurately adjusting the basicity of the slag to determine the supply amount of the basicity adjusting agent to an appropriate amount. [0010] As a method for determining the supply amount of the basicity adjusting agent, Patent Document 2 proposes that an actual slag basicity is measured by an analyzer. The method disclosed in this document includes a step of analyzing the composition of slag actually discharged from the furnace using a simple fluorescent X-ray analyzer and the like, and a basicity adjusting agent based on the analysis result. Decide the amount to add

However, operation management is complicated in this method. Specifically, it is necessary to install a special analyzer and perform periodic analysis work in order to calculate the basicity of slag. In addition, the analyzer is often installed in a specialized institution that is remote from the site, and in that case, it is necessary to transport the slag sample from the processing facility including the gasification melting furnace to the specialized institution. This gives a large time lag between the sampling time of slag and the time when its basicity is known.

[0012] In addition, this method makes it difficult to determine the reliability of analysis results! In this method, an analyzer installed outside the equipment as described above is generally used, and therefore analysis by the analyzer must be performed periodically at relatively long intervals. It is difficult to determine whether the analysis results obtained in such a low frequency are worthy of adoption, or whether they should be excluded as specific values that occur suddenly. If you make this mistake, you will not be able to determine the correct amount of basicity adjuster! /.

Patent Document 1: Japanese Unexamined Patent Publication No. 2006-29678

Patent Document 2: Japanese Patent Laid-Open No. 2001-182924

Disclosure of the invention

[0013] The first invention of this application is to reliably resume good combustion at the time of re-ignition of the burner while performing a highly efficient operation by appropriately stopping the burner of the gasification melting furnace. The purpose is to provide the technology to make this possible.

[0014] In order to achieve the purpose, after the operation of the auxiliary furnace burner of the melting furnace is stopped, if the melting furnace temperature drops to some extent, the waste input is stopped and sent to the gasifier power melting furnace After the oxygen concentration in the gas is increased, the PANA is reignited, or the PANA is reignited while the melting furnace temperature is high to some extent. This method is more efficient due to the burner being out of service! /, Operating! /, But suitable for re-ignition! / It is possible to prevent the PANA from being re-ignited in a state where it is difficult to self-ignite the fuel gas, and to re-ignite the PANA.

[0015] Further, the second invention of this application is to easily perform appropriate basicity adjustment without requiring a special analyzer for analyzing the slag composition when operating the gasification melting furnace. The purpose is to provide technology that makes it possible. In order to achieve this object, the present inventors have repeatedly studied the basicity adjustment described above, and as a result, the calorific value per unit weight of the waste to be input to the gasification melting furnace and the gasification melting It was found that there is a significant correlation between the basicity of slag discharged from the furnace! The use of such correlation makes it possible to quickly and accurately grasp the basicity of actual slag without using a special analyzer.

[0016] In the second invention of this application, the waste to be charged is thermally decomposed, the ash in the pyrolysis gas generated by the thermal decomposition is melted, and the slag generated by the melting is discharged out of the furnace. In order to operate a gasification melting furnace having a slag discharge port, a method for adjusting the basicity of the slag is provided. The method includes a step of supplying a basicity adjusting agent for adjusting the basicity of the slag discharged from the slag discharge loca to a position upstream of the slag discharge port, and the gasification melting furnace per unit time. A step of detecting the weight of the waste to be introduced into the gas, a step of detecting a parameter corresponding to the calorific value per unit weight of the waste, and a gas generated in the gasification and melting furnace based on the detected value of the parameter A step of calculating an expected value of basicity of slag, and supply of the basicity adjuster in a direction to bring the basicity of the slag closer to a preset target value of basicity based on the calculated predicted value of basicity Adjusting the amount.

[0017] In this method, the use of the correlation between the parameter corresponding to the calorific value per unit weight of the waste and the basicity of the actual slag can be realized without performing a complicated analysis of the slag composition. It makes it possible to obtain the expected value of basicity of slag. That is, it is possible to calculate the expected value of the basicity based on the detected value of the parameter and the correlation. Based on the expected basicity of the slag, an appropriate amount of basicity adjusting agent is determined.

[0018] This method is an apparatus for adjusting the basicity of a slag, the slag outlet A basicity adjusting agent supplying means for supplying a basicity adjusting agent for adjusting the basicity of the slag discharged to a position upstream of the slag outlet, and the gasification melting furnace per unit time A waste input amount detecting means for detecting the weight of the waste to be input to the apparatus, a parameter detecting means for detecting a parameter corresponding to the calorific value per unit weight of the waste, and the parameter based on the detected value of the parameter. The basicity expected value calculation means for calculating the basic value of the slag generated in the gasification melting furnace, and based on the predicted basicity value, the basicity is set to a preset basicity target value. This is realized by an apparatus provided with basicity adjusting agent supply amount adjusting means for adjusting the supply amount of the basicity adjusting agent in the approaching direction.

Brief Description of Drawings

FIG. 1 is an overall configuration diagram of a waste treatment facility equipped with a gasification melting furnace according to an embodiment of the first invention of this application.

FIG. 2 is a cross-sectional view showing the structure of the gasification melting furnace.

FIG. 3 is a cross-sectional view showing an arrangement example of thermometers in the gasification melting furnace.

FIG. 4 is a flowchart showing an example of control for determining the timing of re-ignition of the PANA based on the gas oxygen concentration, which is the operation control of the gasification melting furnace.

FIG. 5 is a flowchart showing an example of control for determining the timing of re-ignition of the burner based on the top temperature of the gasification melting furnace.

FIG. 6 is a diagram showing an example of equipment for performing control for determining the timing of re-ignition of the PANA based on the integrated value of the air supply amount, which is operation control of the gasification melting furnace.

FIG. 7 is a flowchart showing an example of control for determining the timing of re-ignition of the burner based on the integrated value of the air supply amount, which is the operation control of the gasification melting furnace.

FIG. 8 is a diagram showing an overall configuration of a waste treatment facility according to an embodiment of the second invention of this application.

FIG. 9 is a graph showing an example of annual changes in waste heat generation and basicity of slag.

FIG. 10 is a graph showing an example of a correlation between waste heat generation and basicity of slag.

FIG. 11 is a graph showing an example of setting the basicity regulator supply amount based on the expected basicity of slag. BEST MODE FOR CARRYING OUT THE INVENTION

[0020] The preferred embodiment of the first invention of this application is described below based on FIG. 1 to FIG.

[0021] FIG. 1 shows an example of a waste treatment facility equipped with a fluidized bed gasification melting furnace. The present invention can be widely applied to the operation of a gasification melting furnace including a gasification furnace and a melting furnace. The overall configuration of the waste treatment facility where the gasification melting furnace is introduced is not particularly limited.

In FIG. 1, waste as waste is temporarily stored in the waste pit 1 and is put into a hopper 2a of a dust feeder 2 which is a waste feed machine by a turret (not shown). A dust feeder 2 quantitatively supplies the waste to a fluidized bed gasifier 3.

[0023] In the gasification furnace 3, for example, partial combustion is performed under the condition of an air ratio of 0.2 to 0.4, and thermal decomposition is performed in which the temperature of a fluidized bed composed of a sand layer or the like is maintained at 450 ° C to 650 ° C. That is, one-seven fire combustion is performed. Non-combustible material out of the waste thrown in by the dust feeder 2 is extracted from the bottom of the hearth, screw conveyor 5 and vibrating sieve! /, 6 and not shown! /, Through a magnetic separator, non-combustible material, non-ferrous metal , Iron and fluidized sand are separated, and the fluidized sand is returned to the sand layer of the gasifier 3 and reused.

The pyrolysis gas generated in the gasification furnace 3 is guided to the melting furnace 4 and further combusted in the melting furnace 4 under the condition of a total air ratio of 1.3, for example. In the melting furnace 4, high temperature combustion of about 1300 ° C is performed while a swirling flow is formed. The heat generated by this high-temperature combustion melts the ash in the pyrolysis gas, separates it from the pyrolysis gas as slag, and decomposes harmful substances in the gas such as dioxin. The molten slag is extracted from the bottom of the melting furnace 4 and is carried out by a slag carry-out device 7 including a conveyor, etc., and cooled and collected by a slag cooler 8 below the molten slag.

[0025] The melting furnace exhaust gas discharged from the swirling flow melting furnace 4 passes through the air heater 9 and the waste heat boiler 10, and the heat in the gas is recovered here. The exhaust gas after the heat recovery is further cooled by the gas cooler 11 and removed by the bag filter 12. The exhaust gas thus purified passes through the induction fan 13, passes through the denitration device 14, and is discharged from the chimney 15.

FIG. 2 shows the details of the structure of the gasification melting furnace constituted by the gasification furnace 3 and the melting furnace 4. In the figure, a dispersion plate 20 having a large number of gas injection ports 22 is provided at the bottom of the gasification furnace 3, and an air box 24 is formed below the dispersion plate 20. For example, fluidized gas is jetted upward from the wind box 24 through the gas injection port 22 of the dispersion plate 20, thereby forming a fluidized bed 26 made of sand particles above the distribution plate 20. In addition, an incombustible outlet 28 is provided in the center of the dispersion plate 20. Incombustible material is extracted from the incombustible material outlet 28 and guided to the screw conveyor 5 and the vibrating screen 6.

[0028] Above the fluidized bed 26, a waste input port 30 connected to the dust feeder 2 is provided, and the same path in the path connecting the waste input port 30 and the dust feeder 2 is provided. A damper 32 is provided to open and close the door! A gasifier temperature raising pan 34 is provided at a height substantially equal to the waste inlet 30. Further above that, a freeboard 36 for secondary combustion is formed, and a pyrolysis gas outlet 38 is provided at the top of the furnace.

The pyrolysis gas discharged from the pyrolysis gas outlet 38 is supplied to the upper part of the swirling melting furnace 4. At the appropriate place of the swirling melting furnace 4 (top of the figure in the figure), an auxiliary combustion burner 40 is provided downward, and a pyrolysis gas inlet 42 is provided immediately below it. The opening 42 is connected to the thermal decomposition gas outlet 38 of the gasification furnace 3 through a duct 44 which is a pyrolysis gas passage. The panner 40 is used for raising the temperature and maintaining the temperature of the melting furnace 4 (for example, ensuring a temperature state of 1300 ° C. or higher). The operation of this PANA 40 will be described in detail later.

Further, a slag outlet 43 is provided at the bottom of the melting furnace 4, and the slag unloading device 7 is connected to the slag outlet 43.

[0031] The duct 44 is provided with an oxygen concentration meter 45. The oxygen concentration meter 45 detects the concentration of oxygen in the gas flowing in the duct 44, that is, in the gas sent from the gasification furnace 3 to the melting furnace 4. A thermometer 46 for detecting the temperature inside the furnace (in this embodiment, the furnace top temperature) is provided in the vicinity of the PANANER 40 (in this embodiment, in the vicinity of the top of the swivel melting furnace 4). Being! /

[0032] The oxygen concentration meter 45 is preferably one having excellent durability. Specifically, for example, a zirconia oximeter is suitable.

[0033] The thermometer 46 has excellent durability and detection accuracy in a high temperature range. Specifically, a radiation thermometer (especially an infrared radiation thermometer) is suitable. The thermometer 46 is preferably disposed at a position where it can be monitored as stably as possible. For example, if a melting furnace combustion air supply nozzle 48 as shown in FIG. 3 is provided in the vicinity of the pyrolysis gas inlet 42 of the melting furnace 4, the thermometer 46 is connected to the nozzle 48 as shown in the figure. It is preferable to be provided at a position where the inside of the furnace top of the melting furnace 4 can be monitored through the nozzle 48 from the upstream position. The arrangement of the thermometer 46 is such that the detection window of the thermometer 46 is blocked by ash or the like in the melting furnace 4 by using the flow of combustion air from the nozzle 48 into the melting furnace 4. It is possible to effectively prevent this from occurring, thereby enabling stable temperature monitoring.

[0034] The position where the thermometer 46 is provided can be appropriately set within a region in the vicinity of the panner 40. Specifically, it can be appropriately set within a range close to the burner 40 to such an extent that unburned gas can be burned by ignition of the burner 40.

Further, the gasification melting furnace is equipped with a control system 50 as shown in FIG. 2, and the control system 50 receives output signals (detection signals) from the oxygen concentration meter 45 and the thermometer 46. Each is entered.

[0036] The control system 50 is configured by a computer or the like, and has a panner control unit 52 and a dust supply control unit 54 as its functions. The PANA control unit 52 outputs a command signal for causing the PANANER 40 to stop operation and re-ignite. The dust supply control unit 54 outputs a command signal for causing the dust feeder 2 to be stopped and restarted.

Next, the operation of the gasification melting furnace and the contents of the operation control performed by the control system 50 will be described with reference to the flowchart of FIG.

In the “normal operation state” (step S 1) shown in FIG. 4, the dust feeder 2 is driven and the burner 40 of the melting furnace 4 is ignited. In this normal operation state, the dust feeder 2 feeds waste such as municipal waste into the furnace 3 from the waste inlet 30 of the gasifier 3. This waste is burned for seven times in the fluidized bed 26 in the furnace 3, thereby generating pyrolysis gas. This pyrolysis gas is sent from the pyrolysis gas outlet 38 at the top of the furnace through the duct 44 to the pyrolysis gas inlet 42 of the melting furnace 4, and is introduced into the upper part of the furnace 4 from this inlet 42. In this melting furnace 4, the combustible component in the pyrolysis gas burns at a higher temperature, and the heat generated by this combustion is the gas. Melt the ash content in the slag. This slag adheres to the furnace wall and then flows down to the slag outlet 43 at the bottom of the furnace and is led out of the furnace.

[0039] The furnace top temperature of the melting furnace 4 is maintained at a high temperature by the ignition of the PANA 40. However, if the top temperature of the furnace reaches about 1300 ° C, the furnace temperature can be kept high for a while by self-combustion of unburned components even if the operation of the auxiliary burner is stopped in that state. . Therefore, from the viewpoint of fuel saving and environmental problems (especially C02 emission control), it is desirable to stop the operation of the burner appropriately.

[0040] Therefore, the control system 50 outputs a panner stop command signal for stopping the operation of the parner 40 when the current operating state matches the preset parner stop condition (step S2). (Step S3).

[0041] Various conditions for stopping the PANA can be set. For example, the following conditions are suitable

Yes

[0042] 1) The state where the furnace top temperature detected by the thermometer 46 is equal to or higher than a preset Pana shutdown temperature (eg, 1100 ° C) is maintained for a predetermined time (eg, 30 minutes) or longer. The determination of the “top temperature” may be performed by confirming an instantaneous value at an appropriate sampling period, or the moving average value of the top temperature within an appropriate time (for example, the predetermined time). May be performed on the basis of When the condition of 1) is set, there is an advantage that the thermometer 46 for confirming the satisfaction of the condition can also be used as a means for timing the stoppage of dust supply and timing for re-igniting the burner, which will be described later. is there.

[0043] 2) The moving average value of the lower heating value of waste is not less than a preset heating value (for example, 2000 kcal / kg). The “low heat generation amount” of the waste here means the amount of heat held by the dust that is put into the gasification furnace 3 by the dust feeder 2 per unit time, and corresponds to the heat amount of waste. .

[0044] The amount of heat retained by the dust can be calculated from the heat balance of the waste disposal facility as disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-37049, and is generally located at a position downstream of the bag filter 12. It is calculated based on the exhaust gas flow rate Fe (Nm3 / h) detected by the exhaust gas flow meter installed in the exhaust gas and the exhaust gas temperature Te (° C) detected by the exhaust gas thermometer installed at the same position. It can be considered that it is equal to the exhaust gas heat output Q. Specifically, this exclusion The heat Q (kcal / h) from the gas is expressed by the following equation, where the specific heat of the exhaust gas is cE.

[0045] Q = cE X Fe XTe

In order to calculate calorie with higher accuracy, in addition to the exhaust gas heat Q, the amount of heat brought in by other media (for example, air, water, and auxiliary fuel of the PANA 40) and The amount of heat is preferably added to the calculation of the calorific value. This point is as described in the publication.

[0046] As the Pana stop condition, either one of the above 1) and 2) may be employed, or both may be employed. That is, the operation of the PANANER 40 may be stopped when at least one of the conditions 1) and 2) is satisfied, or the operation of the PANANER 40 is stopped only when both are satisfied. May be.

[0047] The Pana stop command signal output in step S3 may be used as it is as a control signal or may be used as a notification signal to the operator. In the former case, the automatic stop control of the parner 40 can be realized by inputting the paran stop command signal to the actuator of the parner 40. In the latter case, for example, by inputting the Pana stop instruction signal to the operation panel and lighting the display section of the operation panel, the operator is notified of an appropriate PANA stop timing, and the operator performs the PANA stop timing.

The operation of 40 is stopped at an appropriate timing while being manual.

[0048] After the operation of the parner 40 is stopped in this manner, the parner 40 may be re-ignited at an appropriate timing. However, if the furnace top temperature falls below the self-ignition ignition temperature of the unburned gas for some reason after the operation of the Pana 40 is stopped, if the PANANER 40 is re-ignited at a temperature below the self-burning ignition temperature, the unburned gas Depending on the concentration, re-ignition of the PANA 40 may cause an explosion.

[0049] Therefore, in the control system 50 according to this embodiment, the furnace top temperature detected by the thermometer 46 has dropped to a preset waste charging stop temperature (900 ° C in this embodiment). At that time (YES in step S4), a dust supply stop command signal for stopping the dust supply by the dust feeder 2 is output (step S5). Similarly to the burner stop command signal, this dust supply stop command signal can function as a signal for automatically stopping the dust supply by the dust feeder 2 if it is directly input to the drive unit of the dust feeder 2, for example. S can and again If an operation panel or the like is input so as to light its display unit, it can function as a signal that conveys an appropriate supply stop timing to the operator.

[0050] In step S4, a dust supply stop command signal may be output immediately at the moment when the furnace top temperature falls to the waste charging stop temperature. In order to exclude re-ignition when the furnace top temperature suddenly drops for some reason, the state in which the furnace top temperature has dropped to the waste charging stop temperature remains for a certain period of time. It is preferable that the dust supply stop command signal is output when the above operation continues (for example, 2 to 20 seconds).

[0051] The stoppage of the dust supply as described above increases the concentration of oxygen in the gas discharged from the gasification furnace 3 and sent to the melting furnace 4, and safely reignites the burner 40 in the melting furnace 4. Be ready for Therefore, the control system 50 monitors the oxygen concentration in the gas detected by the oximeter 45, and the oxygen concentration of the gas is set in advance to the Pana reignition concentration (burner reignition concentration; this embodiment). When 10% is reached (YES in step S6), a burner re-ignition command signal (Pana re-ignition command signal) is output (step S8).

[0052] Further, even if the oxygen concentration has not risen to the Pana reignition concentration, the control system 50 has a predetermined temperature higher than the Pana reignition temperature due to a rise in the furnace top temperature for some reason. When the temperature reaches (950 ° C in this embodiment) (YES in step S7), the above-mentioned Pana re-ignition command signal is output. This signal may also be input to the actuator of the PANANER 40 as it is to the PANANER STOP signal and cause the PANANER 40 to be automatically re-ignited, or may be input to the operation panel to allow the operator to properly re-ignite the burner. It may even be a timing display.

[0053] After that, the control system 50 confirms that the dust feeder 2 can be started (YES in step S9), and then outputs a restart command signal to the dust feeder 2 to turn off the dust feeder 2. Reboot (Step S10). This restart may also be performed manually by the operator.

[0054] The above operation ensures high safety when re-igniting the PANANER 40 while reducing the fuel and suppressing C02 emission by stopping the PANANER 40 at an appropriate timing. Is made kurakura.

[0055] FIG. 5 shows another example of operation for ensuring such high safety. Of the operation control operations shown in this figure, the operation up to the PANANER stop command signal output (step S3) is the previous operation. It is equivalent to that shown in Fig. 4. After that output, the control system 50, when the furnace top temperature falls to the preset Pana re-ignition temperature (1000 ° C in this embodiment) (YES in Step S11), A signal is output (step S12).

[0056] The Pana re-ignition temperature reliably prevents the occurrence of abnormal combustion of unburned gas due to the re-ignition when PANA 40 is re-ignited at that temperature, thereby ensuring high safety. The temperature is set to a high level. In general, if the self-ignition temperature of the unburned gas (for example, about 680 ° C in the case of natural gas) is multiplied by a sufficient safety factor and a temperature that has been confirmed to be safe by testing, etc. is adopted. Good.

[0057] Such operation also prevents excessive cooling in the melting furnace 4 in advance by reigniting the PANANER 40 before the furnace top temperature drops so much after the PANA 40 operation is stopped. In addition to this, it is possible to ensure high safety when re-igniting the PANA.

[0058] In this operation, the fail-safe operation is performed when the burner re-ignition command signal is output in step S12 but the operation of the burner 40 is not stopped or the output of the signal itself is disabled. Therefore, the operation shown in FIG. 4 above, that is, the operation of stopping the supply and increasing the oxygen concentration of the gasifier outlet gas may be performed together.

[0059] The operation control shown in Fig. 4 is a force that determines the timing of re-ignition of the burner based on the gas oxygen concentration after stopping the supply of fuel, as a parameter that directly affects the gas oxygen concentration. The integrated value of the amount of air supplied to the upstream side of the melting furnace 4 after the dust is stopped may be monitored, and the timing of re-ignition of the burner may be determined based on this integrated value. An example of this will be described with reference to FIGS.

The facility shown in FIG. 6 includes a blower 60 and a flow meter 62. The blower 60 is for supplying air to the fluidized bed gasification furnace 3, and this air is supplied as fluidized gas into the wind box 24 of the gasification furnace 3, and Is supplied as purge air into the freeboard 36. A pyrolysis gas outlet 38 is provided at the top of the furnace. The flow meter 62 is provided on the outlet side of the blower 60, detects the flow rate of air supplied from the blower 60 to the gasification furnace 3, and outputs a detection signal for the flow rate. This detection signal is input to the control system 50. The control operation of this control system 50 is shown in FIG. In FIG. 7, the operations (steps S1 to S5) until the dust supply stop command signal is output are the same as the operations performed in the control shown in FIG. After the dust supply stop command signal is output, the PANA controller 52 integrates the amount of air supplied to the gasifier 3 from the time when the dust supply stops based on the detection signal (step When the integrated value reaches a preset constant value (YES in step S6B), a Pana re-ignition command signal is output (step S8).

[0062] This control is also performed by supplying air from the blower 60 after the operation of the parner 40 is stopped.

It is possible to reignite the PANANER 40 at a timing when it can be expected that the oxygen concentration in the vicinity of 40 has increased to some extent. This ensures a high level of safety during Pana reignition.

[0063] The air to be integrated includes all air that is supplied to the upstream side of the melting furnace 4 and can contribute to the increase in the oxygen concentration in the melting furnace 4. Therefore, this air is not limited to that supplied into the gasification furnace 3. For example, when purge gas is supplied to a duct 44 provided between the gasification furnace 3 and the melting furnace 4, this purge gas is also included in the accumulation target.

[0064] As described above, according to the first invention of this application, a gasification furnace for gasifying waste to be input and a pyrolysis gas generated in the gasification furnace are introduced and introduced. Method for operating a gasification melting furnace comprising a melting furnace that burns combustible components in the pyrolysis gas and melts ash in the gas, and an auxiliary burner provided in the melting furnace I will provide a. In this operation method, the operation of stopping the operation of the gas generator when the operation state of the gasification melting furnace satisfies a specific condition of stopping the furnace, and the melting furnace in the vicinity of the burner after the operation of the heater is stopped. The operation of stopping the introduction of the waste into the gasification furnace when the internal temperature falls to a preset waste introduction stop temperature, and after the introduction of the waste is stopped, from the gasification furnace And an operation of reigniting the burner when the concentration of oxygen in the gas sent to the melting furnace rises to a preset burner reignition concentration.

[0065] Here, the position where the "temperature in the melting furnace near the burner" is detected is in the vicinity of the burner and in a region where unburned gas can be burned by reignition of the burner. It is possible to set appropriately.

[0066] Further, as an aspect of "stopping the introduction of the waste into the gasification furnace when the temperature in the melting furnace in the vicinity of the paner falls to a preset waste introduction stop temperature" In addition to a mode in which the introduction of the waste is stopped at the moment when the temperature in the melting furnace drops to the waste charging stop temperature, in order to exclude cases where the temperature in the melting furnace suddenly drops, Also included is a mode in which the input of the waste is stopped when the state in which the internal temperature has dropped to the waste input stop temperature has elapsed for a preset time.

[0067] According to this operation method, after the operation of the burner is stopped, the melting furnace temperature in the vicinity of the burner falls to a preset waste charging stop temperature (for example, self-combustion of unburned gas). When the temperature becomes such that ignition is difficult, first, the introduction of the waste into the gasifier is stopped, and the concentration of oxygen in the gas sent from the gasifier to the melting furnace After that, when this concentration rises to the preset re-ignition concentration of the PANA, the PANA is re-ignited to ensure that abnormal combustion of the unburned gas due to this re-ignition is avoided. And good combustion can be resumed.

[0068] After the operation of the burner is stopped, the temperature in the melting furnace in the vicinity of the burner is a preset temperature that is higher than the waste charging stop temperature (for example, unburned gas When the temperature rises to a high enough temperature to avoid abnormal combustion, the PANA may be re-ignited regardless of the oxygen concentration! /.

[0069] In this operation method, after the operation of stopping the operation of the burner is performed when the operation state of the gasification melting furnace satisfies a specific condition of stopping the partner, the inside of the melting furnace in the vicinity of the burner is performed. An operation may be performed to re-ignite the PANA when the temperature drops to a preset PANA re-ignition temperature. This method also makes it possible to prevent the re-ignition of the PANA in an excessively low temperature range (for example, a temperature range in which self-ignition of unburned gas is difficult) and to ensure good combustion. .

[0070] The Pana stop condition can be set as appropriate. However, if the condition for stopping the panner is such that the temperature in the melting furnace in the vicinity of the panner or the moving average value thereof is equal to or higher than the preset temperature at which the panner is stopped, the disposal is performed. Stuffing In order to determine the timing of stopping or the timing of reignition of the burner, it is possible to determine the burner stop condition by using the means for detecting the temperature.

[0071] Further, in this operation method, when the operation state of the gasification melting furnace satisfies a specific partner stop condition, the operation of stopping the operation of the partner is stopped, and after the operation of the partner is stopped, When the temperature in the melting furnace in the vicinity of the temperature falls to a preset waste charging stop temperature, the operation of stopping the charging of the waste into the gasification furnace is performed, and then the charging of the waste is performed. When the integrated value of the amount of air supplied to the upstream side of the melting furnace has reached a certain value from the time when is stopped, an operation of reigniting the panner may be performed. This operation makes it possible to re-ignite after ensuring a sufficient oxygen concentration in the combustion region of the panner, thereby ensuring good combustion.

[0072] As an operation control device of the gasification melting furnace for executing the operation method, a waste input device for inputting the waste into the gasification furnace, and a temperature in the melting furnace in the vicinity of the panner are detected. Of the gasification melting furnace based on the detection results of the thermometer and the oxygen concentration meter, and the oxygen concentration meter for detecting the oxygen concentration in the gas sent from the gasification furnace to the melting furnace. And a control system for controlling operation. The control system includes a panner control unit that outputs a panner stop command signal for stopping the operation of the panner when the operation state of the gasification melting furnace satisfies a specific panner stop condition, and the operation of the panner is stopped. After that, when the temperature falls to the waste input stop temperature set in advance by the thermometer, the waste input for stopping the input of the waste into the gasifier by the waste input machine is performed. A waste input control unit that outputs a stop command signal, and the panner control unit has an oxygen concentration detected by the oximeter after the waste input by the waste input device is stopped. When the PNA re-ignition concentration rises to a preset level, a PANA re-ignition command signal is output to re-ignite the PANA.

[0073] In this apparatus, after the operation of the panner is stopped, the burner control unit is configured such that the temperature in the melting furnace in the vicinity of the panner detected by the thermometer is a preset temperature, and the waste When the temperature rises to a temperature higher than the charging stop temperature, the Pana reignition signal may be output regardless of the oxygen concentration. [0074] Further, as another operation control device for executing the operation method, a waste input device that inputs the waste into the gasification furnace, and a temperature that detects a temperature in the melting furnace in the vicinity of the panner And a control system for controlling the operation of the burner based on the detection result of the thermometer, and this control system stops the operation of the gasification melting furnace with a specific When a condition is satisfied, a Pana stop signal for stopping the operation of the PANA is output.After the operation of the PANA is stopped, the temperature is reduced to a preset re-ignition temperature by the thermometer. One that outputs a Pana reignition signal to resume PANA operation is provided.

[0075] In the above-described apparatus, the condition for stopping the panner is that the temperature detected by the thermometer or its moving average value is equal to or higher than the preset panner stop temperature for a predetermined time. It is preferable that the condition is included! /.

[0076] Further, as another operation control device for executing the operation method, a panner stop for stopping the operation of the panner when an operation state of the gasification melting furnace satisfies a specific condition for stopping the partner When the temperature detected by the thermometer drops to a preset waste charging stop temperature after the operation of the panner is stopped and the temperature of the temperature detected by the thermometer decreases, A waste input control unit that outputs a waste input stop command signal for stopping the input of the waste into the gasifier, and the panner control unit includes the waste input by the waste input device. The amount of air detected by the air amount detecting means is integrated from the time when the introduction of the article is stopped, and when the integrated value reaches a predetermined constant value, the operation of the panner is resumed. An apparatus for outputting a banner re-ignition signal is provided.

[0077] Further, the operation control device described above is generated by a gasification furnace for gasifying the input waste, a waste input machine for inputting the waste into the gasification furnace, and the gasification furnace. An excellent pyrolysis gas is introduced together with a melting furnace that burns combustible components in the introduced pyrolysis gas and melts ash in the gas, and a combustion burner installed in the melting furnace. A gasification melting furnace can be constituted.

Next, an embodiment of the second invention of this application will be described with reference to FIG.

[0079] Fig. 8 shows a waste treatment facility including a gasification melting furnace to which the second invention is applied. The overall configuration is shown. This facility includes a gasification melting furnace 110, a waste supply unit 112 for supplying waste as waste to the gasification melting furnace 110, and a gas for treating the gas discharged from the gasification melting furnace 110. A gas processing unit 114.

The waste supply unit 112 includes a waste pit 116, a waste transport device 118, and a dust feeder 120. The garbage pit 116 receives the garbage which is a treatment target to which external equipment force is also carried, and temporarily stores it. The waste transport device 118 includes a crane, and grips the dust in the waste pit 116 and transports it to the dust feeder 120. The dust feeder 120 has a hopper 122 2, and the hopper 122 accepts the waste introduced from the waste transport device 118. This input amount corresponds to the amount of waste input into the gasification melting furnace 110. The feeder 120 has a built-in screw conveyor for conveying garbage, and supplies the garbage charged into the hopper 122 to the gasification melting furnace 110.

The gasification melting furnace 110 includes a gasification furnace 124 and a melting furnace 126. The gasification furnace 124 pyrolyzes the waste supplied from the dust feeder 120, thereby generating pyrolysis gas. As this gasification furnace 124, for example, a well-known fluidized bed furnace or kiln furnace can be applied as it is. The melting furnace 126 burns combustible components in the pyrolysis gas at a high temperature and melts ash in the gas to generate slag. This slag adheres to the furnace wall of the melting furnace 126, for example. A slag discharge port 128 is provided at the bottom of the melting furnace 126. The slag discharge port 128 is for discharging the slag adhering to the furnace wall and flowing down to the outside of the furnace. Further, in this melting furnace 126, auxiliary fuel is burned by a burner (not shown) as necessary to adjust the temperature in the furnace.

The gas processing unit 114 includes a waste heat boiler 130, a temperature reducing tower 132, a dust collector 134, an induction fan 136, and a chimney 138.

[0083] The waste heat boiler 130 is for recovering heat from the high-temperature exhaust gas emitted from the melting furnace 126. Specifically, the waste heat boiler 130 generates steam using the heat held by the exhaust gas. , It will be discharged. The flow rate of the discharged steam, that is, the amount of steam generated per unit time in the waste heat boiler 130 is a parameter corresponding to the amount of heat generated by the waste introduced into the gasification melting furnace 110 per unit time. It becomes.

[0084] The temperature reducing tower 132 includes a tower main body into which the gas discharged from the waste heat boiler 130 is introduced. A spraying device for spraying cooling water into the tower body, a temperature sensor for detecting the gas temperature at the outlet of the tower body, and the spraying device for keeping the outlet gas temperature detected by the temperature sensor constant. And a controller for adjusting the cooling water supply flow rate.

The dust collector 134 captures dust and the like in the gas discharged from the temperature reducing tower 132. The gas removed by the dust collector 134 is discharged from the chimney 138 through the induction fan 136.

[0086] Further, the equipment includes a basicity adjusting device 140. The basicity adjusting device 140 is for adjusting the basicity of the slag discharged from the slag discharge port 128 of the melting furnace 126. The basicity adjusting agent supply device 142, the steam flow meter 144, An input amount output unit 146 and a controller 150 are provided.

[0087] The basicity adjusting agent supply device 142 is for supplying the basicity adjusting agent into the garbage put into the gasification furnace 124, and is a screw conveyor 147 serving as a conveying means for supplying the basicity adjusting agent. And a motor 148 for rotating the screw conveyor 147. The above basicity adjusting agent is appropriately selected. In this embodiment, it is assumed only when the basicity of the discharged slag is excessively high, and therefore, the basicity adjusting agent is selected from dredged sand (SiO 2) for reducing the basicity of the slag. ! /

2

The steam flow meter 144 measures the exhaust steam flow rate of the waste heat boiler 130, that is, the amount of steam generated per unit time in the waste heat boiler 130.

The waste input amount output unit 146 outputs an information signal about the weight of waste input into the gasifier 124 per unit time. Specifically, the waste input amount output unit 146 is attached to the waste transport device 118, calculates a waste transport amount from the weight load applied to the waste transport device 118 and the number of times of transport, and calculates the waste transport amount. This information is provided to the controller 150 as information corresponding to the amount of waste input to the plant.

The controller 150 is constituted by a microcomputer or the like, and has a function of performing overall control of the entire facility. The functions for adjusting the basicity of the slag include a basicity expected value calculation unit 152 and a basicity adjusting agent supply amount adjustment unit 154.

[0091] The basicity expected value calculation unit 152 outputs an information signal about the weight of the waste to be input into the gasifier 124 per unit time, which is output from the waste input amount output unit 146. Based on the steam flow rate measured by the steam flow meter 144, a predicted value of the basicity of the slag discharged from the slag discharge port 128 is calculated. The calculation of the predicted value is based on the step of calculating the heat generation amount of the waste per unit weight based on the input amount of the waste per unit time and the exhaust steam flow rate, and the generation amount of the waste per unit weight. And calculating a predicted value of the basicity.

[0092] There is a correlation between the flow rate of discharged steam per unit waste weight or the amount of heat generated from waste and the basicity of slag. This correlation can be obtained in advance by actual measurement. Specifically, as shown in the examples described later, the correlation can be estimated by measuring the basicity of the actual slag corresponding to the steam flow rate with an analyzer for a certain period. The correlation can be approximated to, for example, a linear expression (linear expression).

[0093] The predicted basicity value calculation unit 152 stores the correlation, and calculates the predicted basicity value based on the relationship and the steam flow rate actually measured by the steam flow meter 144.

Yes

[0094] The average value of the indicated value of the steam flow meter 144 within a specific period is adopted as the value of the exhaust steam flow rate that is the basis for calculating the basicity expected value. The specific period can be set appropriately, and generally 6 to 24 hours is preferable.

[0095] The basicity adjuster supply amount adjusting unit 154 receives the predicted value of the basicity of the slag calculated by the basicity expected value calculation unit 152 and the garbage input from the waste input amount output unit 146. Based on the information signal about the input amount, the supply amount of the basicity adjusting agent for bringing the basicity close to a preset target value (for example, 0.5) is determined. Then, a control signal is output to the motor 148 of the basicity adjusting agent supply device 142 to control the driving speed so that the determined supply amount can be obtained. The relationship between the predicted value and the actual supply amount of basicity adjuster can be prepared in advance theoretically or by simulation.

[0096] In the apparatus described above and the method for adjusting the basicity of slag performed in this apparatus, parameters for the amount of generated waste heat (herein, waste heat boiler 130) closely related to the basicity. The predicted basicity value is calculated based on the detected value of the parameter and the relationship. This means that the actual slag basicity Unlike conventional methods in which operation is carried out while actually measuring, the amount of basicity adjusting agent to be supplied can be determined appropriately and quickly with a simple configuration using existing equipment.

[0097] This method can be executed even in a facility in which the waste heat boiler 130 is omitted. In that case, for example, a cooling water supply flow rate in the temperature-decreasing tower 132 can be selected as a parameter for the waste heat generation amount. As described above, the temperature-decreasing tower 132 includes a temperature sensor that detects the gas temperature at the outlet of the tower body, and cooling water generated by the spray device so as to keep the outlet gas temperature detected by the temperature sensor constant. And a controller for adjusting the supply flow rate, the supply flow rate of the cooling water corresponds to the amount of heat generated by the waste introduced into the gasification melting furnace 110 per unit time.

The supply position of the basicity adjusting agent is not limited to the inlet side of the gasification furnace 124. This supply position can be arbitrarily set within a region upstream of the slag discharge port 128. For example, the position may be set in a region between the gasification furnace 124 and the melting furnace 126, or in the combustion chamber upstream of the slag discharge port 128 in the melting furnace 126. It may be set.

Example

[0099] Hereinafter, an embodiment relating to the adjustment of the basicity of slag in the waste treatment facility shown in Fig. 8 will be described.

[0100] 1) Correlation between waste heat generation per unit weight and basicity of slag

There is a correlation that can be approximated by a linear function between the amount of generated heat per unit weight and the basicity of the slag.

[0101] Figure 9 shows the annual trends in waste heat per unit weight (kcal / kg) and basicity of slag in a waste treatment facility. This figure clearly shows that the waste heat generation amount and the basicity change close to each other!

[0102] Fig. 10 is a graph showing the relationship between the waste heat value and the basicity of the slag obtained by actual measurement for two waste treatment facilities (Equipment A and Facility B). As shown in this figure, in both facilities A and B, a predetermined correlation is established between the amount of generated heat and the basicity of the slag. In both facilities A and B, the gasification melting furnace will be charged. The relationship between the amount of generated heat and the basicity is different between facilities A and B, but the correlation is approximated by a linear function in both facilities A and B. Can be done. Accordingly, if the relational expression is input and stored in advance in the basicity expected value calculation unit 52, the calculation unit 52 is based on a parameter corresponding to the waste heat generation amount (for example, the exhaust steam flow rate of the waste heat boiler 30). It is possible to quickly calculate the expected basic value of slag.

[0103] 2) Relationship between expected basicity of slag and supply of basicity modifier

The relationship between the expected basicity of the slag and the supply amount of the basicity adjusting agent can be set in advance theoretically or based on simulation. For example, if only adjustment to lower the basicity of slag is assumed, the supply amount of basicity adjusting agent (for example, silica sand) for that purpose (the supply amount corresponding to the input amount of waste per unit time) and the basicity expected value The relationship shown in Fig. 11 should be set. According to this setting, when the basicity prediction value exceeds the target value (for example, 0.5), an amount of basicity adjusting agent corresponding to the excess is supplied.

[0104] As described above, the second invention of this application is to pyrolyze the waste to be charged, melt the ash in the pyrolysis gas generated by the thermal decomposition, and slag generated by the melting. A method for adjusting the basicity of the slag is provided in operating a gasification melting furnace having a slag discharge port for discharging the slag out of the furnace. The basicity adjusting method includes a step of supplying a basicity adjusting agent for adjusting the basicity of slag discharged from the slag discharge port at a position upstream of the slag discharge port, and per unit time. Detecting the weight of the waste charged into the gasification melting furnace, detecting a parameter corresponding to a calorific value per unit weight of the waste, and detecting the gas based on the detected value of the parameter Based on the step of calculating the expected basicity of the slag generated in the chemical melting furnace and the calculated basicity of the basicity, the basicity of the slag is brought closer to the preset basicity target value. And a step of adjusting the supply amount of the basicity adjusting agent.

[0105] This basicity adjustment method uses the correlation between the parameter corresponding to the calorific value per unit weight of the waste and the basicity of the actual slag, thereby complicating the slag composition. It is possible to obtain an expected value of the basicity of the actual slag without performing a detailed analysis. In other words, the predicted value of basicity can be calculated based on the detected value of the parameter and the correlation. And based on the expected value of the basicity of the slag, an appropriate addition amount of the basicity adjusting agent is determined.

Specifically, as a parameter corresponding to the calorific value per unit weight of the waste, the unit time in the waste heat boiler that generates steam using the heat of the gas discharged from the gasification melting furnace force It is effective to detect the amount of generated steam. This amount of generated steam is easy to detect. Moreover, based on the amount of steam generated and the amount of waste input per unit time into the gasification melting furnace, the calorific value of waste per unit weight can be accurately calculated. .

[0107] As specific means for calculating the basicity prediction, for example, before the step of calculating the basic value of the slag generated in the gasification melting furnace, the parameter and the actual It is effective to include a step of obtaining a relationship with the basicity of the slag by actual measurement, and to calculate the prediction of the basicity of the slag generated in the gasification melting furnace based on this relationship and the detected value of the parameter. In this method, an appropriate expected value of the basicity of the slag is quickly calculated based on the relationship between the parameter obtained in advance and the basicity of the actual slag.

[0108] Further, a basicity adjusting device of a gasification melting furnace for executing such a basicity adjusting method is provided. The apparatus includes a basicity adjusting agent supplying means for supplying a basicity adjusting agent for adjusting the basicity of the slag discharged from the slag discharge outlet to a position upstream of the slag discharge outlet, and per unit time. A waste input amount detecting means for detecting the weight of the waste charged into the gasification melting furnace, a parameter detecting means for detecting a parameter corresponding to a calorific value per unit weight of the waste, and the parameter Based on the detected value, basicity expected value calculation means for calculating the expected value of basicity of the slag generated in the gasification melting furnace, and based on the predicted value of basicity, the basicity is calculated in advance. Basicity adjusting agent supply amount adjusting means for adjusting the supply amount of the basicity adjusting agent in a direction approaching a set target value of the basicity.

[0109] As the parameter detection means of this apparatus, for example, it is discharged from the gasification melting furnace. It is preferable to detect the amount of steam generated per unit time in a waste heat boiler that generates steam using the heat of the gas. In that case, the basicity expected value calculation means may calculate the waste per unit weight based on the parameter detected by the parameter detection means and the amount of waste input to the gasification melting furnace per unit time. What is necessary is just to calculate the calorific value. Further, as the basicity adjusting agent supply amount adjusting means, for example, the relationship between the parameter obtained by actual measurement and the basicity of the actual slag is stored, and the stored relationship and the detected value of the parameter It is preferable to determine the supply amount of the basicity adjusting agent based on the above formula.

Claims

The scope of the claims

[1] A gasification furnace for gasifying the input waste and a pyrolysis gas generated in the gasification furnace are introduced, and combustible components in the introduced pyrolysis gas are combusted in the gas. A gasification melting furnace operating method for operating a gasification melting furnace provided with a melting furnace for melting the ash content of the gas and an auxiliary burner provided in the melting furnace,

An operation of stopping the operation of the burner when the operating state of the gasification melting furnace satisfies a specific condition for stopping the burner;

An operation of stopping the introduction of the waste into the gasification furnace when the temperature in the melting furnace in the vicinity of the panner has dropped to a preset waste introduction stop temperature after the operation of the panner is stopped; ,

The operation of reigniting the burner when the concentration of oxygen in the gas sent from the gasification furnace to the melting furnace rises to a preset reignition concentration of the burner after the introduction of the waste is stopped. And including.

[2] According to the operation method of the gasification melting furnace according to claim 1,!

After the operation of the panner is stopped, when the temperature in the melting furnace in the vicinity of the panner rises to a preset temperature that is higher than the waste charging stop temperature, the panner is controlled regardless of the oxygen concentration. Reignite.

[3] A gasification furnace for gasifying the input waste and a pyrolysis gas generated in the gasification furnace are introduced, and combustible components in the introduced pyrolysis gas are combusted in the gas. A gasification melting furnace operating method for operating a gasification melting furnace provided with a melting furnace for melting the ash content of the gas and an auxiliary burner provided in the melting furnace,

An operation of reigniting the burner when the temperature in the melting furnace near the burner drops to a preset burner reignition temperature after the operation of the burner is stopped.

[4] A gasification furnace for gasifying the input waste and a pyrolysis gas generated in the gasification furnace are introduced, and combustible components in the introduced pyrolysis gas are combusted in the gas. Ash content An operation method of a gasification melting furnace for operating a gasification melting furnace provided with a melting furnace for melting the gas and an auxiliary burner provided in the melting furnace,

And an operation of reigniting the panner when the integrated value of the amount of air supplied to the upstream side of the melting furnace reaches a certain value from the time when the introduction of the waste is stopped.

[5] In the method for operating a gasification melting furnace according to any one of claims 1 to 4,

The condition of the stop of the burner includes a condition that the temperature in the melting furnace in the vicinity of the burner or the moving average value thereof is equal to or higher than the preset stop temperature of the furnace for a predetermined time.

[6] A gasification furnace for gasifying the input waste and a pyrolysis gas generated in the gasification furnace are introduced, and combustible components in the introduced pyrolysis gas are combusted in the gas. A gasification melting furnace operation control device for controlling the operation of a gasification melting furnace comprising a melting furnace for melting the ash content of the gas and an auxiliary burner provided in the melting furnace,

A waste input machine that inputs the waste into the gasifier;

A thermometer for detecting the temperature in the melting furnace near the panner;

An oxygen concentration meter for detecting an oxygen concentration in a gas sent from the gasification furnace to the melting furnace;

A control system for controlling the operation of the gasification melting furnace based on the detection results of the thermometer and the oximeter, the control system comprising:

A burner control unit for outputting a burner stop command signal for stopping the operation of the burner when the operation state of the gasification melting furnace satisfies a specific condition for stopping the burner; and after the operation of the burner is stopped, Waste input stop for stopping the input of the waste into the gasification furnace by the waste input device when the temperature detected by the thermometer falls to a preset waste input stop temperature Output command signal A waste input control unit,

In addition, the Pana control unit, at the time when the oxygen concentration detected by the oximeter increases to a preset Pana reignition concentration after the waste charging by the waste charging machine is stopped, Outputs a Pana reignition command signal to reignite the PANA.

[7] The operation control device for the gasification melting furnace according to claim 6! /,

When the temperature of the temperature detected by the thermometer rises to a preset temperature that is higher than the waste charging stop temperature after the operation of the panner is stopped, the PANA control unit Outputs the Pana reignition signal regardless of the concentration

[8] The operation control device for a gasification melting furnace according to claim 6 or 7!

The Pana stop condition includes a condition that a temperature detected by the thermometer or a moving average value thereof is equal to or higher than a preset Pana stop temperature for a predetermined time.

[9] A gasification furnace for gasifying the input waste and a pyrolysis gas generated in the gasification furnace are introduced, and combustible components in the introduced pyrolysis gas are combusted in the gas. A gasification melting furnace operation control device for controlling the operation of a gasification melting furnace comprising a melting furnace for melting the ash content of the gas and an auxiliary burner provided in the melting furnace,

A waste input machine that inputs the waste into the gasifier;

And a control system for controlling the operation of the burner based on the detection result of the thermometer, and the control system is configured so that the operation state of the gasification melting furnace satisfies a specific burner stop condition. When the temperature detected by the thermometer drops to a preset re-ignition temperature after the stop of the operation, the operation of the controller is stopped. A burner re-ignition signal is output to restart the operation.

[10] The operation control device for the gasification melting furnace according to claim 9! /,

The Pana stop condition includes the temperature detected by the thermometer or the temperature shift. The condition that the state where the dynamic average value is equal to or higher than the preset Pana stop temperature is maintained for a predetermined time is included.

[11] A gasification furnace for gasifying the input waste and a pyrolysis gas generated in the gasification furnace are introduced, and combustible components in the introduced pyrolysis gas are combusted in the gas. The operation of a gasification melting furnace comprising a melting furnace for melting the ash content, an air supply means for supplying air to the upstream side of the melting furnace, and an auxiliary burner provided in the melting furnace is controlled. An operation control device for a gasification melting furnace for

A waste input machine that inputs the waste into the gasifier;

An air amount detection means for detecting the amount of air supplied by the air supply means; and a control system for controlling the operation of the panner. The control system specifies the operating state of the gasification melting furnace. A burner control unit for outputting a burner stop signal for stopping the operation of the burner when a condition for stopping the burner is satisfied, and a temperature detected by the thermometer after the operation of the burner is stopped. A waste input control unit that outputs a waste input stop command signal for stopping input of the waste into the gasification furnace by the waste input device when the waste input stop temperature is lowered. Including,

Further, the Pana control unit integrates the amount of air detected by the air amount detecting means from the time when the waste input by the waste input device is stopped, and the integrated value is a predetermined constant value. When the temperature reaches the burner, a burner re-ignition signal for restarting the operation of the burner is output.

[12] A gasification melting furnace,

A gasification furnace for gasifying the input waste;

A waste input machine that inputs waste into the gasifier;

A melting furnace in which pyrolysis gas generated in the gasification furnace is introduced, combustible components in the introduced pyrolysis gas are burned, and ash in the gas is melted;

A burner provided in the melting furnace;

An operation control device for a gasification melting furnace according to any one of claims 5 to 11;

[13] The waste to be input is pyrolyzed and the ash in the pyrolysis gas generated by the pyrolysis is melted. At the same time, when operating a gasification melting furnace having a slag discharge port for discharging slag generated by the melting out of the furnace, a slag base in the gasification melting furnace is used to adjust the basicity of the slag. A method of adjusting the degree,

Supplying a basicity adjusting agent for adjusting the basicity of the slag discharged from the slag discharge port to a position upstream of the slag discharge port;

A step of detecting the weight of waste charged into the gasification melting furnace per unit time;

Detecting a parameter corresponding to a calorific value per unit weight of the waste; calculating a predicted value of basicity of slag generated in the gasification melting furnace based on a detection value of the parameter;

And a step of adjusting the supply amount of the basicity adjusting agent in a direction to bring the basicity of the slag closer to a preset basicity value based on the calculated predicted value of the basicity of the slag.

[14] The method for adjusting the basicity of the slag in the gasification melting furnace according to claim 13, wherein the parameter is a waste heat boiler that generates steam using the heat of the gas discharged from the gasification melting furnace as the parameter. The amount of steam generated per unit time is detected,

Based on this steam heat generation amount and the amount of waste input to the gasification melting furnace per unit time, the heat generation amount of waste per unit weight is calculated.

[15] In the method for adjusting the basicity of slag in the gasification melting furnace according to claim 13 or 14,

Further, before calculating the predicted value of the basicity of the slag generated in the gasification melting furnace, calculating the predicted value by obtaining a correlation between the parameter and the basicity of the actual slag in advance by actual measurement Then, based on the correlation and the detected value of the parameter, an expected value of basicity of slag generated in the gasification melting furnace is calculated.

[16] The waste that is input is pyrolyzed, and the ash in the pyrolysis gas generated by the pyrolysis is melted, and a slag discharge port is provided for discharging the slag generated by the melting out of the furnace. A slag basicity adjusting device for adjusting the basicity of the slag to adjust the basicity of the slag,

A basicity adjusting agent supplying means for supplying a basicity adjusting agent for adjusting the basicity of the slag discharged from the slag discharge port at a position upstream of the slag discharge port; and the gasification per unit time. Waste input detection means for detecting the weight of waste input to the melting furnace;

Parameter detecting means for detecting a parameter corresponding to the calorific value per unit weight of the waste;

A basicity expected value calculating means for calculating an expected value of the basicity of slag generated in the gasification melting furnace based on the detected value of the parameter;

Basicity adjusting agent supply amount adjusting means for adjusting the supply amount of the basicity adjusting agent in a direction to bring the basicity close to a preset basicity target value based on the predicted basicity value.

[17] The apparatus for adjusting the basicity of slag in the gasification melting furnace according to claim 16, wherein the parameter detecting means generates waste heat using heat of the gas discharged from the gasification melting furnace force. It detects the amount of steam generated in the boiler,

The basicity expected value calculation means is a heat generation amount of waste per unit weight based on a steam generation amount detected by the parameter detection means and an input amount of waste per unit time to the gasification melting furnace. Is calculated.

[18] In the apparatus for adjusting the basicity of slag in the gasification melting furnace according to claim 16 or 17,

The basicity adjusting agent supply amount adjusting means stores a relationship between the parameter obtained by actual measurement in advance and an actual basicity of the slag, and based on the stored relationship and the detected value of the parameter. Determine the supply amount of the degree adjusting agent.