KR20090057441A - Operating method and operation control apparatus for gasification melting furnace - Google Patents

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

OPERATING METHOD AND OPERATION CONTROL APPARATUS FOR GASIFICATION MELTING FURNACE}

The present invention relates to a method and an operation control apparatus for a gasification furnace for treating waste such as municipal waste or industrial waste, and more particularly, to a method and apparatus for adjusting the basicity of slugs discharged from a gasification furnace. .

Background Art Conventionally, as a means for treating waste, a fluidized bed gasification furnace described in, for example, Patent Document 1 is known. The fluidized bed gasification furnace has a fluidized bed gasification furnace in which a fluidized bed is formed by a fluidized gas and a melting furnace at its rear end. The fluidized bed gasifier partially burns waste introduced into the fluidized bed to produce pyrolysis gas. The furnace further burns the pyrolysis gas produced by the fluidized bed gasifier to produce slugs in accordance with dissolving the ash in the same gas. On the top of the melting furnace, an auxiliary burner for maintaining the furnace temperature is provided.

The operation of such a gasification furnace has the following problems to be solved.

1) Burner operation

In the gasification furnace, if the temperature in the furnace reaches about 1300 ° C, the furnace temperature is maintained at a high temperature for a while due to the self-burning of unburned components even if the operation of the burner for the auxiliary combustion is stopped. . Therefore, it is preferable to stop the operation of the burner appropriately from the viewpoint of fuel saving and environmental problems (especially suppression of CO ₂ emission).

However, once the operation of the burner is stopped in this way, it is sometimes impossible to resume good combustion during subsequent re-ignition. For example, if the burner is re-ignited at a time when the temperature in the furnace near the burner drops rapidly due to a certain factor after the burner operation stops and becomes below the spontaneous combustion temperature of the unburned gas present in the vicinity of the burner, abnormal combustion occurs. There is a risk of occurrence.

2) fluidity of slug

In the gasification melting furnace as described above, in order to ensure that the slug is stably discharged from the slug discharge port, it is important to maintain the fluidity. If the state in which the slug fluidity is lowered continues, this slug may block the slug outlet and cause continuous operation to be inhibited.

As parameters that govern the fluidity of the slug, there is a temperature and basicity (CaO / SiO ₂ ) of the slug. In order to maintain the fluidity of the slug, it is condition that the temperature of the slug is higher than the melting point, and there is a significant correlation between the melting point and the basicity of the slug. Specifically, when the basicity of the slug exceeds the value of about 0.7, the melting point of the slug also increases with the increase, for example, when the basicity of the slug is 1, the melting point of the slug reaches up to 1200 ° C. have.

Therefore, in order to perform stable continuous operation of the gasification furnace efficiently, it is important to adjust the basicity of the slug. Even if the operation of maintaining the inside of the melting furnace at a substantially constant temperature, the actual slug fluidity depends on the fluctuation of the basicity, so that stable operation is difficult unless the basicity of the slug is maintained within an appropriate range. In addition, if the operating temperature in the furnace is set a little higher in anticipation of the fluctuation in basicity, which is the above-described form, the decrease in operating efficiency is inevitable. For example, when the basicity of the slug reaches 1, the temperature of the slug must be 1200 ° C or higher in order to allow the slug to be stably exited from the slug outlet. In addition, since the temperature of this discharged slug tends to be lower by 100 to 150 ° C than the furnace temperature of the furnace, the temperature in the furnace must be 1350 ° C or higher in order to stabilize the output of the slug. Continued high temperature operation of this type for a long time will not only increase the need for an increase in external fuel for insulating the furnace, but also increase the operating cost, but also lead to an increase in environmental load or maintenance cost for damage to the refractory. Can be.

Therefore, conventionally, in order to adjust the basicity of the said slug, supplying a basicity regulator to a system is performed. Specifically, in the case of lowering the basicity, silica sand (SiO ₂ ) or the like is supplied into the system, and in the case of increasing the basicity, slaked lime (Ca (OH) ₂ ) or the like is supplied. Only a suitable amount of the basicity regulator of the above form is supplied into the system, so that the basicity of the slug is maintained within a preferable range. That is, determining the supply amount of this basicity regulator to an appropriate amount becomes an essential condition for optimally adjusting the basicity of the slug.

As a method for determining the supply amount of the basicity regulator, Patent Document 2 proposes to measure the basicity of actual slug by an analyzer. The method disclosed in this document includes analyzing the composition of slug actually discharged from the furnace using a simple fluorescence X-ray analyzer or the like, and determining the addition amount of the basicity modifier based on the analysis result.

However, operation management is complicated in this method. Specifically, in order to calculate the basicity of the slug, it is necessary to install a special analyzer and perform regular analysis. In addition, the analytical system is often installed in a specialized institution far from the field, and in this case, transportation of slug samples from the processing facility including the gasification furnace to the specialized institution is necessary. This gives a large temporal difference between when the slug is sampled and when the basicity is found.

In addition, in the above method, it is difficult to determine the reliability of the analysis result. In this method, in order for an analytical system installed outside the facility of the above-described type to be generally used, analysis by the analytical system must be periodically performed at a relatively long interval. The low frequency of the above forms makes it difficult to determine whether the analytical results are suitable for adoption or should be excluded as unexpected values. And if this discrimination is made incorrectly, it will not be possible to determine the appropriate amount of adjustment of basicity regulator.

Patent document 1: Unexamined-Japanese-Patent No. 2006-29678

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

The 1st invention of this invention provides the technique for making it possible to reliably resume good combustion at the time of reignition of the burner, while carrying out a high efficiency operation by appropriately stopping the burner of a gasification furnace. For the purpose of

In order to achieve the above object, after stopping the operation of the burner for burning of the furnace, when the furnace temperature drops to a certain degree, the waste is stopped and the oxygen burner is increased after increasing the oxygen concentration in the gas sent from the gasifier to the furnace. Or re-ignite the burner when the furnace temperature is somewhat high. The above method prevents the burner from re-igniting in a state that is not suitable for re-ignition (e.g., a state where spontaneous combustion of unburned gas is difficult) while carrying out a high-efficiency operation through the stop of the burner. This makes it possible to properly reignite the burner.

Moreover, the 2nd invention of this invention aims at providing the technique which makes it easy to perform appropriate basicity adjustment, without requiring a special analyzer for analyzing a slug composition at the time of operating a gasification melting furnace. do. In order to achieve the above object, the inventors of the present invention have repeatedly studied the basicity adjustment, and as a result, between the calorific value near the unit weight of the waste put into the gasification furnace and the basicity of the slug discharged from the gasification furnace, There is a significant correlation between. The use of the correlation as described above made it possible to quickly and accurately grasp the basicity of the actual slug without using a special analysis device or the like.

According to a second aspect of the present invention, there is provided a gasification system having a slug outlet for pyrolyzing the waste introduced, dissolving ash in the pyrolysis gas generated by the pyrolysis and discharging the slug generated by the dissolution out of the furnace. When operating the furnace, a method for adjusting the basicity of the slug is provided. The method includes supplying a basicity regulator for adjusting the basicity of the slug discharged from the slug outlet at a position upstream of the slug outlet, and detecting the weight of the waste put into the gasification furnace about a unit time. And detecting a parameter corresponding to a calorific value near a unit weight of the waste, calculating an estimated value of slug basicity generated in the gasification melting furnace based on the detected value of the parameter, and calculating the calculated value. Based on the expected value of basicity, adjusting the amount of supply of said basicity regulator in the direction of approaching the basicity of said slug to the target value of predetermined basicity.

In the above method, using the correlation between the parameters corresponding to the calorific value near the unit weight of the waste and the actual slug basicity makes it possible to obtain an expected value of the actual slug basicity without performing a complicated analysis of the slug composition. do. That is, it is possible to calculate the expected value of the basicity based on the detected value of the parameter, the correlation, and the like. Therefore, the appropriate addition amount of a basicity regulator is determined based on the estimated value of the slug basicity.

The method is an apparatus for adjusting the slug basicity, the basicity regulator supplying means for supplying a basicity regulator for adjusting the basicity of the slug discharged from the slug outlet at a position upstream of the slug outlet, and unit time Waste input amount detecting means for detecting the weight of the waste introduced into the gasification furnace, parameter detecting means for detecting a parameter corresponding to the calorific value near the unit weight of the waste, and the gasification based on the detected value of the parameter. A basicity predicting means calculating means for calculating an estimated value of slug basicity generated in the melting furnace, and a basicity adjusting agent supplying amount adjusting means for adjusting the supplying amount of the basicity adjusting agent in a direction in which the basicity is approached to a target value of a predetermined basicity based on the basicity expected value. Equipped device Is realized.

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

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

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

4 is a flowchart showing an example of control for determining the timing of burner re-ignition based on the gas oxygen concentration in the operation control of the gasification furnace.

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

It is a figure which shows the example of a facility for performing control which determines the timing of burner reignition based on the integrated value of the air supply amount in the operation control of the said gasification melting furnace.

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

It is a figure which shows the whole structure of the waste processing apparatus which concerns on 2nd invention embodiment of this invention.

9 is a graph showing an example of annual trends in waste calorific value and slug basicity.

10 is a graph showing an example of the correlation between waste calorific value and slug basicity.

It is a graph which shows the example of setting the basicity regulator supply amount based on the estimated value of slug basicity.

Preferred embodiment of 1st invention of this invention is described based on FIG.

1 shows an example of a waste treatment facility equipped with a fluidized bed gasification melting furnace. Further, the present invention can be widely applied to the operation of a gasification furnace having a gasifier and a melting furnace. The overall configuration of the waste treatment facility into which the gasification furnace is introduced is not particularly limited.

As shown in Fig. 1, waste as waste is preferentially stored in the waste pit 1 and fed into the hopper 2a of the feeder 2, which is a waste feeder, by a crane (not shown). The feeder 2 quantitatively supplies waste to the gasifier 3 of the fluidized bed type.

In the gasifier 3, for example, partial combustion is performed under the condition of an air ratio of 0.2 to 0.4, and pyrolysis, that is, primary combustion, is performed while maintaining the temperature of the fluidized bed, which is a sand layer or the like, at 450 ° C to 650 ° C. Non-combustibles in the waste introduced by the feeder (2) come out of the bottom of the road through a screw conveyor (5) and vibrating body (6) and charity (磁選 機, not shown) incombustibles, nonferrous metals, iron, flow Each is separated into sand, and the flow sand therein is returned to the sand layer of the gasifier 3 and reused.

The pyrolysis gas generated in the gasifier 3 is led to the melting furnace 4 and is burned once more in the melting furnace 4 under, for example, a total air ratio of 1.3. In the melting furnace 4, high-temperature combustion of about 1300 ° C is performed while swirl flow is formed. The heat generated by the high temperature combustion dissolves the ash in the pyrolysis gas, separates it as slug from the pyrolysis gas, and decomposes harmful substances in gases such as dioxins. The molten slug comes out of the bottom of the melting furnace 4 and is taken out by the slug discharging device 7 including a conveyor or the like and cooled by the slug cooling device 8 at the lower portion thereof and recovered.

The melting furnace exhaust gas discharged from the swirl flow melting furnace 4 passes through the air heater 9 and the waste heat boiler 10, where heat in the same gas is recovered. The exhaust gas after the heat recovery is once again cooled by the gas cooler 11 and is damped by the bug filter 12. The exhaust gas purified as mentioned above is discharged from the chimney 15 via the decoction fan 13 through the denitration apparatus 14.

FIG. 2 shows the structure of the gasification melting furnace comprised by the said gasifier 3 and the melting furnace 4 in detail.

In the same figure, the distribution plate 20 which has many gas injection ports 22 is provided in the bottom part of the said gasifier 3, and the wind phase 24 is formed in the lower part. Fluidized bed 26 consisting of sand particles on the upper side of the dispersion plate 20, for example, as the upwardly fluidized gas is injected from the wind-phase 24 through the gas injection port 22 of the dispersion plate 20. Is formed. In addition, a non-combustible discharge port 28 is provided at the center of the dispersion plate 20. The incombustibles are extracted from the incombustibles outlet 28 and guided to the screw conveyor 5 and the vibrating body 6.

Above the fluidized bed 26, a waste inlet 30 connected to the feeder 2 is provided, and a damper for opening and closing a copper path in a path for binding the feeder 2 to the waste inlet 30. (32) is provided. A gas burner 34 is installed at a height approximately equal to the waste inlet 30. A secondary combustion free board 36 is formed on the upper side thereof, and a pyrolysis gas outlet 38 is provided on the furnace part.

The pyrolysis gas discharged from the pyrolysis gas outlet 38 is supplied to the top of the swing furnace 4. In the place of the swinging melting furnace 4 (the top of the drawing example), the burner 40 for supporting is installed downward, and the pyrolysis gas inlet 42 is provided directly underneath, and this pyrolysis gas inlet ( 42 is connected to the pyrolysis gas outlet 38 of the gasifier 3 via a duct 44 which is a pyrolysis gas passage. The burner 40 is used for raising the temperature of the melting furnace 4 and maintaining the temperature (for example, securing a temperature state of 1300 ° C or higher). Operation of the burner 40 will be described later.

In addition, a slug discharge port 43 is provided at the bottom of the melting furnace 4, and the slug discharge device 7 is connected to the slug discharge port 43.

An oxygen concentration meter 45 is provided in the duct 44. The oxygen concentration meter 45 detects the gas flowing in the duct 44, that is, the concentration of oxygen in the gas sent from the gasifier 3 to the melting furnace 4. In the vicinity of the burner 40 (in the above-described embodiment, in the vicinity of the route of the swing melting furnace 4), the thermometer 46 which detects the inside temperature of the furnace (in this embodiment, the landing temperature). Is installed.

As the oxygen concentration meter 45, one having excellent durability is preferable. Specifically, a zirconium oxide type oxygen concentration meter is very suitable, for example.

It is preferable that the thermometer 46 is excellent in durability and excellent in the degree of detection in a high temperature region, and a radiation thermometer (especially an infrared radiation thermometer) and the like are particularly suitable. Although the installation position of the said thermometer 46 can be set suitably in the range which a peak temperature can be detected, the position which can monitor as stably as possible is preferable. For example, when a combustion air supply nozzle 48 as shown in FIG. 3 is installed near the pyrolysis gas inlet 42 of the furnace 4, the thermometer 46 is shown. As described above, the nozzle 48 is preferably provided at a position capable of monitoring the inside of the furnace 4 through the nozzle 48 from the position on the upstream side of the nozzle 48. The arrangement of the thermometer 46 uses the flow of combustion air from the nozzle 48 to the inside of the melting furnace 4, and the detection window of the thermometer 46 is blocked by ash in the melting furnace 4. It is possible to effectively prevent the thing, thereby enabling stable temperature monitoring.

The position at which the thermometer 46 is installed can be appropriately set in the region near the burner 40. Specifically, the burner 40 can be appropriately set in a range close to the burner 40 to the extent that combustion of unburned gas may occur due to the ignition of the burner 40.

In addition, the gasification melting furnace is provided with a control system 50 having the form shown in FIG. 2, and output signals (detection signals) of the oxygen concentration meter 45 and the thermometer 46 are input to the control system 50, respectively. .

The control system 50 is constituted by a computer or the like and has a feed control unit 54 as a burner control unit 52 as a function thereof. The burner control unit 52 outputs a command signal for causing the burner 40 to stop operation and re-ignition, respectively. The feed control unit 54 stops and restarts the feeder 2. Outputs a command signal to execute.

Next, the operation of the gasification furnace and the contents of the operation control performed by the control system 50 will be described with reference to the flowchart of FIG. 4.

In the "normal operation state" (S1 step) as shown in FIG. 4, the feeder 2 is driven and the burner 40 of the melting furnace 4 is ignited. In the normal operation state, the feeder 2 feeds waste such as municipal waste into the gasifier 3 from the waste inlet 30 of the gasifier 3. The waste is first burned into the fluidized bed 26 in the gasifier 3, whereby pyrolysis gas is generated. The pyrolysis gas is sent from the pyrolysis gas outlet 38 of the furnace through the duct 44 to the pyrolysis gas inlet 42 of the melting furnace 4, and is introduced from the inlet 42 into the upper part of the melting furnace 4. In the melting furnace 4, the combustible component in the pyrolysis gas is further burned at a higher temperature, and the heat generated by the combustion dissolves the ash in the gas into slugs. The slug is attached to the furnace wall, and further downstream to the slug outlet 43 of the furnace, leading out of the furnace.

The top temperature of the melting furnace 4 is maintained at a high temperature by the ignition of the burner 40. However, when the top temperature reaches about 1300 ° C, the furnace temperature is maintained at a high temperature for a while due to the self-combustion of unburned components even when the burner for the burning operation is stopped. Therefore, it is preferable to stop the operation of the burner appropriately from the viewpoint of fuel saving and environmental problems (especially suppression of CO ₂ emission).

Then, the control system 50 outputs a burner stop command signal for stopping the operation of the burner 40 at the point in time at which the current operating state matches the preset burner stop condition (step S2). ).

The burner stop condition can be set in various ways. For example, the following conditions are very suitable.

1) The state where the top temperature detected by the said thermometer 46 is more than predetermined burner stop temperature (for example, 1100 degreeC) is maintained more than predetermined time (for example, 30 minutes). The determination of the above-mentioned "treatment temperature" may be performed by confirming an instantaneous value in a suitable sampling period, and may be performed based on the moving average value of the above-mentioned temperature in a suitable time (for example, said predetermined time). Okay. When the condition of 1) is set, there is an advantage that the thermometer 46 for confirming the fulfillment of the condition can be used as a means for achieving the timing of sudden stop and burner re-ignition described later.

2) The moving average value of the low calorific value of waste is more than a preset calorific value (for example, 2000 kcal / kg). The term "low-level waste heat generation amount" as used herein means a calorie value held by the waste introduced into the gasifier 3 by the feeder 2 per unit time, and corresponds to the calorific value of the waste.

The waste heat retention amount of the waste is, for example, disclosed in Japanese Patent Laid-Open No. 2004-37049, and can be calculated from a heat balance of a waste treatment facility. In general, a waste gas flow meter installed at a position downstream of the bug filter 12 is provided. To be regarded as the same as the exhaust gas discharge heat quantity Q calculated on the basis of the temperature Te (° C.) of the exhaust gas detected by the exhaust gas thermometer installed at the same position as the flow rate Fe (Nm 3 / h) detected by the exhaust gas. Also good. Specifically, the exhaust gas discharge heat quantity Q (kcal / h) is expressed by the following equation when the specific heat of the exhaust gas is cE.

Q = cE × Fe × Te

In order to perform a more accurate calorie calculation, in addition to the said exhaust gas discharge heat quantity Q, the amount of heat input by the other medium (for example, air, water, and auxiliary fuel of the burner 40), and the expenditure by the said medium It is preferable that calorie | heat amount etc. add to calculation of the said calorific value. This point is as described in the above publication.

As said burner stop condition, only one of the said 1) and 2) may be employ | adopted, and both may be employ | adopted. That is, the operation of the burner 40 may be stopped when at least one of the conditions 1) and 2) is satisfied, or the operation of the burner 40 may be stopped only when both of the conditions are satisfied.

The burner stop command signal output in step S3 may be used as a control signal as it is, or may be used as a notification signal to an operator. In the former case, automatic stop control of the burner 40 can be realized by inputting the burner stop command signal to the actuator of the burner 40. In the latter case, the burner stop command signal is input to, for example, the operation panel to light up the display of the operation panel, so that an appropriate burner stop timing is notified to the operator and the operation of the burner 40 is stopped by the operator. It is operated manually and stopped at an appropriate timing.

The burner 40 may be re-ignited at an appropriate timing after the burner 40 is stopped in the above manner. However, when the burner 40 is re-ignited at a temperature below the spontaneous ignition temperature after the burner temperature becomes lower than the spontaneous ignition temperature of the unburned gas due to some factor after the operation of the burner 40 stops, Depending on the concentration of the combustion gas, it is also conceivable that the re-ignition of the burner 40 may cause an explosion.

Therefore, the control system 50 which concerns on the said embodiment at the time when the top temperature detected by the said thermometer 46 dropped to preset waste input stop temperature (900 degreeC in this embodiment) (in step S4). YES), a feed stop command signal for stopping feed by the feeder 2 is output (step S5). Like the burner stop command signal, the feed stop command signal can also function as a signal for automatically stopping the feed by the feeder 2 when it is input as it is to the drive unit of the feeder 2, for example. In addition, when the display unit is input to turn on the display unit or the like, it is also possible to function as a signal for transmitting an appropriate sudden stop timing to the operator.

In the step S4, a sudden stop command signal may be output immediately at the moment when the top temperature drops to the waste input stop temperature. However, in order to exclude re-ignition when the corresponding top temperature suddenly drops due to any factor, the state where the top temperature has dropped to the waste input stop temperature continues for a predetermined time or more (for example, 2 to 20 seconds). It is preferable that the said emergency stop command signal is output when it is made.

The stopping of the feed as described above increases the concentration of oxygen in the gas discharged from the gasifier 3 and sent to the melting furnace 4, so that the burner 40 can be safely reignified in the melting furnace 4. It is in a state. The control system 50 monitors the oxygen concentration in the gas detected by the oxygen concentration meter 45, and the burner re-ignition concentration (burner re-ignition concentration; 10% in the present embodiment) whose oxygen concentration is preset. At step S6, the burner re-ignition command signal (burner re-ignition command signal) is output (step S8).

In addition, even if the said oxygen concentration does not rise to the burner re-ignition concentration, the said control system 50 raises a predetermined temperature higher by some factor than the burner re-ignition temperature (950 degreeC in this embodiment). At the point of arrival (YES in step S7), the burner re-ignition command signal is output. Like the burner stop signal, the above signal is also input to the actuator of the burner 40 as it is, so that the burner 40 is automatically fired, and the burner recursively input to the operation panel is appropriate for the operator. It may be a display of the timing of the conversation.

After that, the control system 50 confirms that the feeder 2 can be started (YES in step S9), and outputs a restart command signal to the feeder 2 to restart the feeder 2. (Step S10). It is also preferable that the restart is performed manually by the operator.

The operation of the above-described form ensures high safety during the re-ignition of the burner 40 while saving the fuel and suppressing CO ₂ emission by stopping the burner 40 at an appropriate timing. Make it possible.

Another example of operation for ensuring high safety of the above form is as shown in FIG. Among the operation control operations shown in the drawing, the operation up to the burner stop command signal output (step S3) is equivalent to that shown in FIG. 4 above. After the output, the control system 50 outputs the burner re-ignition command signal at the time when the top temperature drops to the preset burner re-ignition temperature (1000 ° C in this embodiment) (YES in step S11) (S12). step).

The burner re-ignition temperature is set to a high temperature to such an extent that when the burner 40 is re-ignited at that temperature, abnormal combustion of unburned gas due to the re-ignition is certainly avoided and high safety is ensured. Generally, it is the temperature which doubled the safety factor sufficient to the spontaneous ignition temperature (for example, about 680 degreeC in the case of natural gas) of the said unburned gas, and it is preferable to employ | adopt the temperature confirmed safety by test etc.

In the operation of the above-described mode, after the burner 40 is stopped, the burner 40 is re-ignited before the top temperature is too low, thereby preventing excessive cooling in the melting furnace 4 in advance, and at the same time, burner recurrence. High security of fire can be ensured.

In addition, for the above operation, in order to prevent the accident when the operation of the burner 40 is not stopped even when the burner re-ignition command signal is output in step S12 or when the output of the corresponding signal is disabled. It is also preferable that the operation shown in Fig. 4, that is, the operation of stopping the feeding and increasing the oxygen concentration of the outlet gas by gasification is also performed.

The operation control as shown in FIG. 4 above determines the timing of the reignition of the burner according to the gas oxygen concentration after stopping the feeding, but from the stopping of the feeding as a parameter directly affecting the gas oxygen concentration. It is also preferable to monitor the integrated value of the amount of air supplied to the upstream side of (4), and to determine the timing of reignition of the burner in accordance with this integrated value. An example thereof will be described with reference to FIGS. 6 and 7.

The facility shown in FIG. 6 is equipped with the blower 60 and the flowmeter 62. As shown in FIG. The blower 60 is for supplying air to the fluidized-bed gasifier 3, which is supplied as a fluidizing gas into the wind-bed 24 of the gasifier 3, and in some cases, It is supplied as purge air in the free board 36. The furnace section is provided with a pyrolysis gas outlet 38. The flow meter 62 is provided at the outlet side of the blower 60 to detect the flow rate of air supplied from the blower 60 to the gasifier 3, and outputs a detection signal for the flow rate. . The detection signal is input to the control system 50.

The control operation of the control system 50 is as shown in FIG. In FIG. 7, the operation (steps S1 to S5) until the output of the sudden stop command signal is output is equivalent to the operation performed by the control shown in FIG. After the sudden stop command signal is output, the burner control unit 52 accumulates the amount of air supplied to the gasifier 3 from the point where the feeding stops, in accordance with the detection signal (step S6A). When the integrated value reaches a preset value (YES in step S6B), the burner re-ignition command signal is output (step S8).

The control also controls the burner 40 at a timing at which it can be predicted that the oxygen concentration in the vicinity of the burner 40 is increased to some extent by the supply of air from the blower 60 after the burner 40 is stopped. Makes it possible to reignite. This ensures high safety at burner re-ignition.

As the air to be accumulated, all of those that can be supplied to the upstream side of the melting furnace 4 and contribute to an increase in the oxygen concentration in the melting furnace 4 are included. Therefore, this air is not limited to what is supplied in the gasifier 3. For example, when a purge gas is supplied to the duct 44 provided between the gasifier 3 and the melting furnace 4, this purge gas is also included in the said accumulation object.

As described above, according to the first aspect of the present invention, a gasification furnace for gasifying an introduced waste and a pyrolysis gas generated by the gasification furnace are introduced to burn combustible components in the introduced pyrolysis gas to dissolve ash in the copper gas. Provided is an operation method for operating a gasification melting furnace having a melting furnace and a burning burner installed in the melting furnace. The operation method includes an operation of stopping the operation of the burner when the operation state of the gasification furnace satisfies a specific burner stop condition, and adding waste in which the temperature in the furnace near the burner is preset after the operation of the burner is stopped. The operation of stopping the input of the waste into the gasifier at the time when the temperature falls to the stop temperature, and the burner re-ignition in which the concentration of oxygen in the gas sent from the gasifier to the melting furnace after the input of the waste is stopped is preset. And re-igniting the burner at the time point up to the concentration.

Here, about the position which detects "the melting furnace temperature in the vicinity of a burner", it is possible to set suitably in the area | region which can burn unburned gas by reignition of the said burner in the vicinity of the said burner.

In addition, about the form of "stopping the said injection of the said waste into the said gasifier at the time when the temperature in the furnace near the burner fell to the preset waste input stop temperature", the temperature in the said furnace reaches the said waste input stop temperature. In addition to stopping the input of the waste at the moment of the drop, except for the case where the temperature in the furnace suddenly drops, only a predetermined time has elapsed since the temperature in the furnace has dropped to the waste input stop temperature. In this case, the form of stopping the input of the waste is also included.

According to this operation method, after stopping the operation of the burner, when the temperature in the melting furnace near the burner drops to a predetermined waste input stop temperature (for example, it becomes a temperature state where spontaneous combustion of unburned gas becomes difficult). In this case, first, the introduction of the waste into the gasifier can be stopped to increase the concentration of oxygen in the gas sent from the gasifier to the melting furnace, and then the concentration is increased to the preset burner reignition concentration. By re-igniting the burner at this point, it is possible to reliably avoid abnormal combustion of the unburned gas due to the re-ignition and to resume good combustion.

In addition, after the burner operation is stopped, the temperature in the furnace near the burner is a preset temperature and is high enough to avoid abnormal combustion of unburned gas (eg, unburned gas). Temperature), it is also preferable to re-ignite the burner regardless of the oxygen concentration.

In the operation method, after the operation of stopping the burner when the operation state of the gasification furnace satisfies a specific burner stop condition, the temperature in the furnace near the burner drops to a preset burner re-ignition temperature. You may perform the operation which reignites the said burner at one point in time. This method also makes it possible to prevent the burner from reignition in an excessively low temperature region (for example, a temperature region in which spontaneous combustion of unburned gas becomes difficult) and to ensure good combustion.

The burner stop condition can be appropriately set. However, if the burner stop condition is a condition that the state in which the temperature in the furnace near the burner or the moving average value is equal to or greater than the preset burner stop temperature is maintained for a predetermined time, the timing of stopping the waste input or re-ignition of the burner In order to achieve the timing, the burner stop condition can also be determined using the means for detecting the temperature.

Moreover, in this operation method, the operation | movement which stops the operation of the said burner when the operation state of the said gasification furnace meets a specific burner stop condition, and after the operation of the said burner are stopped, the temperature in the furnace near the burner advances beforehand. After the operation of stopping the input of the waste into the gasifier when the temperature is dropped to the set waste input stop temperature or the like is performed, the integrated value of the amount of air supplied to the upstream side of the melting furnace is changed from the time when the input of the waste is stopped. The burner may be re-ignited when a certain value is reached. This operation makes it possible to re-ignite after sufficiently securing the oxygen concentration in the combustion region of the burner, and ensures good combustion.

An operation control apparatus for a gasification furnace for carrying out the above operation method, comprising: a waste injector for introducing the waste into the gasifier, a thermometer for detecting the temperature in the furnace near the burner, and a gasifier from the gasifier to the melting furnace. Is provided with an oxygen concentration meter for detecting the oxygen concentration in the gas, and a control system for controlling the operation of the gasification furnace based on the detection result of the thermometer and the oxygen concentration meter. The control system includes a burner control unit that outputs a burner stop command signal for stopping the operation of the burner when the operation state of the gasification furnace satisfies a specific burner stop condition, and after the operation of the burner is stopped, the thermometer And a waste input control unit for outputting a waste input stop command signal for stopping the input of the waste into the gasifier furnace by the waste injector when the temperature drops to a predetermined waste input stop temperature by The burner control unit, after stopping the input of the waste by the waste injector, burner reignition for reburning the burner when the oxygen concentration detected by the oxygen concentration meter rises to a preset burner reignition concentration. Output the command signal.

In the apparatus, the burner control unit, when the operation of the burner is stopped, when the temperature in the furnace near the burner detected by the thermometer is a predetermined temperature and rises to a temperature higher than the waste input stop temperature, The burner reignition signal may be output regardless of the oxygen concentration.

In addition, as a separate operation control device for executing the operation method, a waste injector for injecting the waste into the gasifier, a thermometer for detecting the temperature in the furnace near the burner, and based on the detection result of the thermometer And a control system for controlling the operation of the burner, which outputs a burner stop signal for stopping the operation of the burner when the operation state of the gasification furnace satisfies a specific burner stop condition. After the burner stops operating, it is provided to output a burner re-ignition signal for resuming the operation of the burner when the temperature drops by the thermometer to a preset burner re-ignition temperature.

The burner stop condition in the apparatus as described above preferably includes a condition that the temperature detected by the thermometer or the moving average value is equal to or higher than the preset burner stop temperature is maintained for a predetermined time.

In addition, as a separate operation control device for executing the operation method, a burner control unit for outputting a burner stop signal for stopping the operation of the burner when the operation state of the gasification furnace meets a specific burner stop condition; And after the burner is stopped, when the temperature detected by the thermometer falls to a preset waste input stop temperature, waste input stop for stopping the input of the waste into the gasifier by the waste input machine. And a waste input control unit for outputting a command signal, wherein the burner control unit accumulates the amount of air detected by the air quantity detecting unit from the time when the input of the waste by the waste injector is stopped, and the integrated value is increased. When the burner reaches a preset value, the burner operation is resumed. A device for outputting a signal is provided for a burner recurrence screen.

In addition, the above-described operation control apparatus includes a gasification furnace for gasifying the introduced waste, a waste injector for introducing waste into the gasification furnace, and pyrolysis gas generated in the gasification furnace, where combustible components in the introduced pyrolysis gas are introduced. It is possible to constitute an excellent gasification melting furnace together with a melting furnace for burning ash to dissolve ash in copper gas and a burner for combustion provided in the melting furnace.

Next, an embodiment of the second invention of the present invention will be described with reference to FIG. 8.

8 shows the overall configuration of a waste treatment facility including a gasification furnace, to which the second invention is applied. The facility includes a gasification furnace 110, a waste supply unit 112 for supplying waste to the gasification furnace 110, and a gas treatment unit 114 for processing gas discharged from the gasification furnace 110. ).

The said garbage supply part 112 is equipped with the garbage pit 116, the garbage conveying apparatus 118, and the feeder 120. As shown in FIG. The said waste pit 116 receives the waste which is the process object carried in from the exterior of a facility, and stores it once. The waste conveying apparatus 118 is equipped with a crane, and catches the waste in the said waste pit 116, and conveys it to the said feeder 120. FIG. The feeder 120 includes a hopper 122, and the hopper 122 receives waste input from the waste conveying apparatus 118. The input amount corresponds to the garbage input amount in the gasification furnace 110. The feeder 120 has a built-in screw conveyor for conveying waste, and supplies the waste introduced into the hopper 122 to the gasification melting furnace 110.

The gasification furnace 110 includes a gasification furnace 124 and a melting furnace 126. The gasifier 124 pyrolyzes the waste supplied from the feeder 120, thereby generating pyrolysis gas. For the gasifier 124, for example, a well-known fluidized bed furnace or kiln furnace can be applied as it is. The melting furnace 126 burns the combustible components in the pyrolysis gas at a high temperature, and simultaneously dissolves ash in the copper gas and generates slugs. The slug is attached to the furnace wall, for example in the furnace 126. The slug outlet 128 is installed in the furnace of the melting furnace 126. The slug outlet 128 serves to discharge the slug attached to the furnace wall and out of the furnace. In addition, in the melting furnace 126, the auxiliary fuel is burned by a burner not shown in order to adjust the temperature in the furnace.

The gas processing unit 114 includes a waste heat boiler 130, a temperature reduction tower 132, a dust collector 134, a manned blower 136, and a chimney 138.

The waste heat boiler 130 serves to recover heat from the high-temperature exhaust gas from the melting furnace 126, specifically, serves to generate and discharge steam by using the heat of the exhaust gas. . The discharge steam flow rate, that is, the amount of steam generated per unit time for the waste heat boiler 130, is a parameter corresponding to the calorific value of the waste injected per unit time for the gasification furnace 110.

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

The dust collector 134 captures dust and the like in the gas discharged from the thermal tower 132. The gas damped by the dust collector 134 passes through the manned blower 136 and is discharged from the chimney 138.

In addition, the above facilities include a basicity adjusting device 140. The basicity adjusting device 140 is for adjusting the basicity of the slug discharged from the slug outlet 128 of the melting furnace 126, the basicity regulator supply device 142, the steam flow meter 144, and the waste input amount It has an output unit 146 and a controller 150.

The basicity regulator supply device 142 is for supplying a basicity regulator into the waste put into the gasifier 124, and the screw conveyor 147, which is a conveying means for the supply, and the screw conveyor 147 The motor 148 which rotates is provided. The said basicity regulator is suitably selected. In the above embodiment, only when the basicity of the slug discharged is excessively high, it is assumed, and therefore, as the basicity regulator, silica sand (SiO ₂ ) for lowering the basicity of the slug is selected.

The steam flow meter 144 measures the discharge steam flow rate of the waste heat boiler 130, that is, the amount of steam generated at a unit time with respect to the waste heat boiler 130.

The waste input amount output unit 146 outputs an information signal about the weight of the waste put into the gasifier 124 at a unit time. Specifically, the waste input amount output unit 146 is installed in the waste conveying apparatus 118 to calculate the weight load and the number of conveyances or the waste conveying quantity applied to the waste conveying apparatus 118, and calculates the amount of the waste gas from the gasifier ( 124) is provided to the controller 150 as information corresponding to the amount of garbage input.

The controller 150 is configured by a microcomputer or the like and has a function of performing overall control of the entire facility. In addition, a function of adjusting the basicity of the slug includes a basicity predicting value calculating unit 152 and a basicity adjusting agent supply amount adjusting unit 154.

The basicity predicted value calculating unit 152 is output from the waste input amount output unit 146 and measured by the steam flow meter 144 and an information signal about the weight of the waste put into the gasifier 124 about a unit time. The estimated value of the slug basicity discharged from the slug discharge outlet 128 is calculated according to the vapor flow rate to be obtained. The calculation of the estimated value may include calculating a calorific value of the rubbish per unit weight based on the input amount of the rubbish per unit time and the discharge steam flow rate and calculating an estimated value of the basicity based on the generation amount of the rubbish per unit weight. Is achieved by.

There is a correlation between the discharge steam flow rate or waste calorific value per unit waste weight and the slug basicity. Said correlation can be calculated | required beforehand by actual measurement. Specifically, as shown through the examples to be described later, the correlation can be estimated by measuring the basicity of the actual slug corresponding to the steam flow rate by a analyzer for a certain period of time. The correlation can be approximated to, for example, a linear equation.

The basicity predicting value calculating unit 152 stores the correlation and calculates the estimated value of the basicity based on the relation and the steam flow rate measured by the steam flow meter 144.

In addition, as a value of the discharge | emission steam flow volume which is the basis of calculation of the said basicity anticipated value, the average value is employ | adopted within the specific period of the indication value of the said steam flowmeter 144. As shown in FIG. The specific period can be appropriately set, and generally about 6 to 24 hours are very suitable.

The basicity regulator supply amount adjusting unit 154, based on the estimated value of the basicity of the slug calculated by the basicity predicting value calculating unit 152, and the information signal for the waste input amount input from the waste input amount output unit 146, The basicity is determined to supply a basicity adjuster for approaching a predetermined target value (for example, 0.5). Then, in the form in which the determined supply amount can be obtained, a control signal is output to the motor 148 of the basicity regulator supply device 142 to control the driving speed. The relationship between the expected value and the actual amount of basicity regulator supply can be prepared in advance by theory or by simulation.

In the apparatus shown above and the adjustment method of the slug basicity performed with respect to this apparatus, the parameter about the waste calorific value (here discharge steam flow rate of the waste heat boiler 130) which is closely related with the basicity is paying attention, and the parameter The expected value of the basicity is calculated based on the detected value of the above and the above relationship. This is unlike a conventional method of advancing operation while actually measuring slug basicity in an analytical system, and it is possible to determine the amount of basicity regulator to be supplied appropriately and quickly as a simple configuration using existing equipment.

The method allows the waste heat boiler 130 to be carried out even for equipment in which it is omitted. In this case, the cooling water supply flow rate in the temperature reduction tower 132 can be selected as a parameter for the waste heat generation amount, for example. The temperature reduction tower 132, as described above, the temperature sensor for detecting the gas temperature at the outlet of the tower body, and the cooling water by the spray device to maintain the outlet gas temperature detected by the temperature sensor constant Since it is provided with a controller for adjusting the supply flow rate, the cooling water supply flow rate corresponds to the calorific value of the waste put into the gasification furnace 110 per unit time.

The supply position of the basicity regulator is not limited to the inlet side of the gasifier 124. The supply position can be arbitrarily set in the region upstream of the slug outlet 128. For example, the position may be set in an area between the gasifier 124 and the melting furnace 126, and in the combustion chamber upstream of the slug outlet 128 in the melting furnace 126. It may be set.

Example

Hereinafter, the Example regarding adjustment of the slug basicity in the said waste processing facility shown in FIG. 8 is demonstrated.

1) Correlation between waste calorific value per unit weight and basicity of slug

There is a correlation between the calorific value per unit weight and the slug basicity that can be obtained as an approximation of the linear function.

9 shows the annual trend of waste calorific value (kcal / kg) and basicity of slugs near unit weight in any waste treatment facility. The figure clearly shows that the waste calorific value and the basicity change approximately.

FIG. 10 graphically shows the relationship between the waste calorific value and the basicity of the slug obtained by actual measurement for two waste treatment facilities (facilities A and B). As shown in the figure, in any of the facilities A and B, a predetermined correlation is established between the amount of waste heat generated and the basicity of the slug. In both equipments A and B, the relationship between the waste calorific value and the basicity differs between equipments A and B in order to change the components of the waste put into the gasification furnace. Can be approximated by a linear function. Therefore, when the relational expression is previously inputted and stored in the basicity predicting value calculating unit 52, the calculating unit 52 may slug based on a parameter corresponding to the waste heat generation amount (for example, the discharge steam flow rate of the waste heat boiler 30). It is possible to quickly estimate the estimate of basicity.

2) Relationship between the estimated basicity of slug and the amount of basicity regulator

The relationship between the estimated value of slug basicity and the basicity regulator supply amount can be set in advance based on the theory or simulation. For example, in the case where only the adjustment for lowering the slug basicity is assumed, the relationship between the supply amount of the basicity regulator (for example, silica sand) (for example, the supply amount corresponding to the input amount of garbage per unit time) and basicity expected value is shown in FIG. 11. It is preferable if the settings are as shown. According to the above setting, when the basicity expected value exceeds the target value (for example, 0.5), an amount of basicity regulator corresponding to the excess is supplied.

As mentioned above, the 2nd invention of this invention pyrolyzes the waste thrown in, dissolves the ash in the pyrolysis gas produced by the pyrolysis, and discharges the slug discharge port for discharging the slug produced by the dissolution to the outside of a furnace. Eggplant provides a method for adjusting the basicity of the slug when operating the gasification melting furnace. The salt airway adjustment method, the step of supplying a basicity regulator for adjusting the basicity of the slug discharged from the slug outlet at a position upstream than the slug outlet, and the weight of the waste put into the gasification furnace about a unit time Detecting a parameter corresponding to the calorific value near the unit weight of the waste, calculating an estimated value of the basicity of slug generated in the gasifier based on the detected value of the parameter, and calculating And adjusting the supply amount of the basicity modifier in a direction in which the basicity of the corresponding slug approaches the target value of the predetermined basicity based on the expected value of basicity.

In the basicity adjustment method, the correlation between the parameters corresponding to the calorific value near the unit weight of the waste and the actual degree of slug basicity is used, so that the estimated value of the basicity of the actual slug can be estimated without complex analysis of the slug composition. It is possible to get That is, it is possible to calculate the expected value of the basicity based on the detected value of the parameter and the correlation. And the appropriate addition amount of a basicity regulator is determined based on the estimated value of the basicity of the said slug.

Specifically, as a parameter corresponding to the calorific value near the unit weight of the waste, it is effective to detect the amount of steam generated per unit time in a waste heat boiler that generates steam by using the heat of the gas discharged from the gasification furnace. The steam generation amount is easy to detect. In addition, the calorific value of the waste per unit weight can be accurately calculated based on the amount of steam generated and the amount of waste input per unit time of the gasification furnace.

As a specific means for calculating the estimated value of the basicity, for example, before the step of calculating the estimated value of the basicity of the slug generated in the gasification furnace, the actual step of requesting the relationship between the parameter and the basicity of the actual slug by actual measurement It is effective to calculate the estimated value of the basicity of the slug which generate | occur | produces in the said gasification melting furnace based on this relationship and the detected value of the said parameter. In this method, an appropriate estimated value of the basicity of the slug is quickly calculated based on the relationship between the parameter previously obtained and the basicity of the slug.

Moreover, the basicity adjustment apparatus of a gasification melting furnace for implementing such a basicity adjustment method is provided. The apparatus includes a basicity regulator supplying means for supplying a basicity regulator for adjusting the basicity of the slug discharged from the slug outlet at a position upstream of the slug outlet, and the weight of waste introduced into the gasification furnace about a unit time. A waste input amount detecting means for detecting a gas, a parameter detecting means for detecting a parameter corresponding to a calorific value near the unit weight of the waste, and an estimated value of the basicity of slug generated in the gasification furnace based on the detected value of the parameter. A basicity predicting means calculating means and a basicity adjusting agent supplying amount adjusting means for adjusting the supplying amount of the basicity adjusting agent in a direction in which the basicity approaches a target value of a predetermined basicity based on the estimated value of the basicity.

As the parameter detecting means of the apparatus, for example, it is very suitable to detect the amount of steam generated per unit time in a waste heat boiler that generates steam by using the heat of the gas discharged from the gasification furnace. In this case, it is preferable that the basicity predicting value calculating means calculates the calorific value of the waste per unit weight based on the parameter detected by the parameter detecting means and the amount of the waste input per unit time in the gasification furnace.

In addition, as said basicity regulator supply amount adjusting means, for example, the relationship between the parameter obtained by actual measurement and the actual slug basicity is stored, and the basicity is based on the stored relationship and the detected value of the parameter. It is very appropriate to determine the supply of modifiers.

Through the operation method and the operation control apparatus of the gasification furnace according to the present invention, it is possible to reliably resume good combustion during the re-ignition of the burner while carrying out a high-efficiency operation by appropriately stopping the burner of the gasification furnace. When the gasification furnace is operated, it is possible to easily perform appropriate basicity adjustment without requiring a special analyzer for analyzing slug composition.

Claims (18)

A gasification furnace for gasifying the introduced waste, a melting furnace for introducing the pyrolysis gas generated in the gasification furnace and burning the combustible components in the introduced pyrolysis gas to dissolve ash in the copper gas; In a method of operating a gasification furnace for driving a gasification furnace equipped with a burner, An operation of stopping the operation of the burner when the operation state of the gasification furnace satisfies a specific burner stop condition; An operation of stopping the input of the waste into the gasifier when the temperature in the melting furnace near the burner drops to a preset waste input stop temperature after the burner operation is stopped; Operating the gasification furnace, wherein the burner is re-ignited when the concentration of oxygen in the gas sent from the gasifier to the melting furnace rises to a preset burner reignition concentration after the input of the waste is stopped. Way. The burner according to claim 1, wherein after the burner operation is stopped, the burner is restarted regardless of the oxygen concentration when the temperature in the melting furnace near the burner rises to a temperature higher than the waste inlet stop temperature at a preset temperature. A method of operating a gasification furnace, characterized in that the gasification furnace. A gasification furnace for gasifying the introduced waste, a melting furnace for introducing the pyrolysis gas generated in the gasification furnace and burning the combustible components in the introduced pyrolysis gas to dissolve ash in the copper gas; In a method of operating a gasification furnace for driving a gasification furnace equipped with a burner, An operation of stopping the operation of the burner when the operation state of the gasification furnace satisfies a specific burner stop condition; And re-ignition the burner when the temperature in the furnace near the burner drops to a preset burner re-ignition temperature after the burner operation is stopped. A gasification furnace for gasifying the introduced waste, a melting furnace for introducing the pyrolysis gas generated in the gasification furnace and burning the combustible components in the introduced pyrolysis gas to dissolve ash in the copper gas; In a method of operating a gasification furnace for driving a gasification furnace equipped with a burner, An operation of stopping the operation of the burner when the operation state of the gasification furnace satisfies a specific burner stop condition; An operation of stopping the input of the waste into the gasifier when the temperature in the melting furnace near the burner drops to a preset waste input stop temperature after the burner operation is stopped; And re-igniting the burner when the integrated value of the amount of air supplied to the upstream side of the melting furnace reaches a constant value from the time when the waste is stopped. The said burner stop condition includes the conditions in which the state in which the temperature inside the furnace near the said burner or the moving average value of the said temperature is more than preset burner stop temperature is maintained for a predetermined time. A method of operating a gasification furnace, characterized in that. A gasification furnace for gasifying the introduced waste, a melting furnace for introducing the pyrolysis gas generated in the gasification furnace and burning the combustible components in the introduced pyrolysis gas to dissolve ash in the copper gas; In the operation control apparatus of the gasification furnace for controlling the operation of the gasification furnace equipped with a burner, A waste injector for injecting the waste into the gasifier; A thermometer for detecting the temperature in the furnace near the burner; An oxygen concentration meter for detecting an oxygen concentration in the gas sent from the gasifier to the melting furnace; A control system for controlling the operation of the gasification furnace based on a detection result of the thermometer and the oxygen concentration meter; The control system, A burner controller for outputting a burner stop command signal for stopping the operation of the burner when the operation state of the gasification furnace satisfies a specific burner stop condition; After the operation of the burner is stopped, when the temperature detected by the thermometer falls to a preset waste input stop temperature, waste input stop for stopping the input of the waste into the gasifier by the waste input machine. Waste input control unit for outputting a command signal, The burner control unit burns the burner for reignition when the oxygen concentration detected by the oxygen concentration meter rises to a preset burner reignition concentration after the input of the waste by the waste injector is stopped. An operation control device for a gasifier, characterized in that for outputting a command signal. The said burner control part is related with the said oxygen concentration, when the temperature which is detected by the said thermometer after the operation | movement of the said burner is a preset temperature and rose to temperature higher than the said waste input stop temperature is carried out. And a burner re-ignition signal to output the gas control furnace. The burner stop condition includes a condition that the temperature detected by the thermometer or the moving average value of the temperature is maintained for a predetermined time according to the burner stop condition. Operation control device for gasification melting furnace. A gasification furnace for gasifying the injected waste, a pyrolysis gas generated by the gasification furnace is introduced, a melting furnace for burning the combustible components in the introduced pyrolysis gas to dissolve ash in the copper gas, and a supporting tank installed in the melting furnace. In the operation control apparatus of the gasification furnace for controlling the operation of the gasification furnace equipped with a burner, A waste injector for injecting the waste into the gasifier; A thermometer for detecting the temperature in the furnace near the burner; A control system for controlling the operation of the burner based on a detection result of the thermometer, The control system outputs a burner stop signal for stopping the operation of the burner when the operation state of the gasification furnace satisfies a specific burner stop condition, and is detected by the thermometer after the burner operation is stopped. And a burner re-ignition signal for resuming the operation of the burner when the temperature is lowered to a preset burner re-ignition temperature. The gas burner according to claim 9, wherein the burner stop condition includes a condition that a temperature detected by the thermometer or a moving average value of the temperature is equal to or greater than a preset burner stop temperature is maintained for a predetermined time. Operation control device. A gasification furnace for gasifying the injected waste, a pyrolysis gas generated by the gasification furnace is introduced, a melting furnace for burning the combustible components in the introduced pyrolysis gas to dissolve ash in the copper gas, and air upstream of the melting furnace. In the operation control apparatus of a gasification melting furnace for controlling the operation of the gasification melting furnace equipped with the air supply means to supply and the burner for a tank provided in the said melting furnace, A waste injector for injecting the waste into the gasifier; Air amount detecting means for detecting an amount of air supplied by the air supply means; A control system for controlling the operation of the burner, The control system, A burner control unit which outputs a burner stop signal for stopping operation of the burner when the operation state of the gasification furnace satisfies a specific burner stop condition; A waste input stop instruction for stopping the input of the waste into the gasifier by the waste feeder when the temperature detected by the thermometer drops to a preset waste input stop temperature after the burner operation is stopped; Waste input control unit for outputting a signal, The burner control unit accumulates the amount of air detected by the air quantity detecting means from the time when the input of the waste by the waste injector is stopped, and operates the burner when the integrated value reaches a predetermined predetermined value. And a burner reignition signal for restarting. A gasifier for gasifying the injected waste, A waste injector for injecting waste into the gasifier, A melting furnace for introducing pyrolysis gas generated by the gasification furnace to burn combustible components in the introduced pyrolysis gas to dissolve ash in the copper gas; A burner for combustion installed in the melting furnace, The gasification melting furnace of Claim 5 thru | or 11 provided with the operation control apparatus of the gasification melting furnace. The sludge basicity when operating a gasification melting furnace having a slug discharge port for pyrolyzing the waste to be introduced, dissolving ash in the pyrolysis gas generated by the pyrolysis and discharging the slug produced by the dissolution to the outside of the furnace. In the method of adjusting the slug basicity of the gasification furnace to control the Supplying a basicity regulator for adjusting the basicity of the slug discharged from the slug outlet at a position upstream of the slug outlet; Detecting a weight of waste introduced into the gasification furnace about a unit time; Detecting a parameter corresponding to the calorific value near the unit weight of the waste; Calculating an estimated value of slug basicity generated in the gasification furnace based on the detected value of the parameter, And adjusting the supply amount of the basicity regulator in a direction to approach the target slug basicity based on the calculated basicity of the slug based on the estimated value of the basicity of the slug. . The method of claim 13, wherein as the parameter, The amount of steam generated per unit time to a waste heat boiler that generates steam by using the heat of the gas discharged from the gasification furnace, is detected, And calorific value of waste per unit weight is calculated on the basis of the steam calorific value and the amount of waste injected into the gasification furnace per unit time. 15. The method according to claim 13 or 14, comprising the step of actually requesting a correlation between the parameter and the actual slug basicity in advance before calculating the expected value of the slug basicity occurring in the gasification furnace, And in the calculating of the expected value, an estimated value of the slug basicity generated in the gasification melting furnace is calculated according to the correlation and the detected value of the parameter. The slug basicity is decomposed at the time of operating a gasification melting furnace having a slug discharge port for pyrolyzing the introduced waste, dissolving ash in the pyrolysis gas generated by the pyrolysis, and discharging the slug produced by the dissolution to the outside of the furnace. In the slug basicity adjusting device of the gasification melting furnace for adjusting, Basicity regulator supply means for supplying a basicity regulator for adjusting the basicity of the slug discharged from the slug outlet at a position upstream of the slug outlet; Waste input amount detecting means for detecting a weight of the waste introduced into the gasification furnace about a unit time; Parameter detecting means for detecting a parameter corresponding to a calorific value near the unit weight of the waste; Basicity predicting means calculating means for calculating an expected value of slug basicity generated in the gasification melting furnace based on the detected value of the parameter; And a basicity regulator supply amount adjusting means for adjusting the basicity of the basicity in the direction of approaching the target value of the basicity set in advance in accordance with the expected value of basicity. The method according to claim 16, wherein the parameter detecting means detects the amount of steam generated in the waste heat boiler that generates steam by using the heat of gas discharged from the gasification furnace, The basicity predicting unit calculates the calorific value of the waste per unit weight based on the amount of steam generated by the parameter detecting unit and the amount of waste per unit time input to the gasification furnace. . The said basicity regulator supply amount adjusting means memorize | stores the relationship between the said parameter calculated | required previously by actual measurement, and the basicity of an actual slug, The stored relationship and the detected value of the said parameter are a thing of Claim 16 or 17. A slug basicity adjusting device for a gasification melting furnace, characterized in that the supply amount of the basicity adjusting agent is determined on the basis of.

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