JPH0734075A - Method for inspecting flow-down of slag of coal-gasification furnace and apparatus therefor - Google Patents

Abstract

PURPOSE:To accurately inspect the state of a slag while avoiding the problems inherent to the inspection of the stag state by temperature detection and image pickup and to prevent the stop of the flow-down of slag, the clogging of a slag discharge hole and the breakage of the slag discharge hole before the occurrence of these troubles. CONSTITUTION:A sound detector 30 to detect the sound and vibration generated by the collision of a falling slag 10 with cooling water 4 in a sink 21 is placed above the cooling water 4 in the sink 21. A controller 33 is connected to an operation apparatus of e.g. a slag tap burner 15 which promotes the flow down of the slag 10 by heating. The volume and temperature of the fallen slag can be estimated from the intensity of the sound and vibration caused by the collision of the slag 10 with water and the variation of the frequency of the sound, etc., with time. The data on the intensity of the sound and vibration and the variation pattern of the frequency of the sound, etc., generated by the collision of the stag 10 having 2 risk to cause the clogging of stag 10 are preparatorily inputted into the controller 33 and a counter-measure such as the start-up of a slag tap burner 15 is taken by the controller 33 when the variation pattern is observed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention processes a solid carbonaceous raw material represented by coal such as a spouted bed coal gasifier at a high temperature in a gasification furnace while melting ash to remove harmful components. The present invention relates to a coal gasifier slag flow monitoring method and device for monitoring the state of slag and preventing clogging of a slag discharge hole in a device that takes out slag that is difficult to elute to the outside of the system.

[0002]

2. Description of the Related Art Coal is a useful energy source with abundant reserves, but its treatment method is difficult because it contains a dozen or more percent of ash mainly composed of alumina, silica, etc. and harmful metals such as Cr. Its use range was narrowed. However, in a spouted bed coal gasifier or the like, coal can be treated at a high temperature to melt ash and be taken out of the system as slag in which harmful components are difficult to elute. For this reason, the field of application is greatly expanded, and it is particularly promising to be used as a fuel for power generation or a raw material for industry.

A system diagram of a conventional spouted bed coal gasification furnace is shown in FIG. In this device, pulverized coal is conveyed using line 5, oxygen-containing gas and steam are injected into high-temperature gasification furnace 1 using lines 6 and 7, respectively, and partially combusted in gasification section 2. Is. The gas generated by this partial combustion is sent through the gasification furnace 1 and through the discharge hole at the top and the line 8 to the downstream gas purification process for dedusting, desulfurizing, etc. When used for power generation, the gas turbine is used. Send to.
The gas refining process is omitted in FIG.

On the other hand, as a byproduct of the above-mentioned partial combustion, the ash content in the coal is melted to form the slag 10. This slag 10 is made to flow down along the slag discharge hole 3 provided below the gasification furnace 1, and is dropped into the cooling water 4 which fills the space portion 40 below the slag discharge hole 3 for water granulation and cooling. Discharge from the discharge port 9.

The above-mentioned partial combustion is usually carried out at a high temperature of about 1500 to 1700 ° C., which is about 100 ° C. higher than the melting temperature of the raw ash.
Combustion at such a temperature is based on the following considerations. That is, in order to improve the cold gas efficiency (ratio of generated gas calorific value to coal calorific value), CO ₂
It is necessary to suppress the supply amount of excess oxygen that causes the generation of non-pyrogenic substances, such that the partial combustion temperature is preferably relatively low, while the slag 10 is solidified when the temperature becomes too low. However, it becomes difficult to flow down and collect the slag 10. As a result, unless the slag can be stably discharged by the spouted bed coal gasifier, the coal cannot be stably gasified in the gasification furnace and continuous operation cannot be performed.

For this reason, the partial combustion temperature is kept high enough to melt the slag 10. However, since the cooling water 4 is generally a low temperature of 100 ° C. or less, the following problems are still avoided in the conventional apparatus. I can't.

FIG. 12 is an enlarged sectional view of a conventional slag discharge hole portion. As shown in FIG. 1, the slag 10 is an upper portion of the slag discharge hole 3 (hereinafter, referred to as “upper portion of slag discharge hole”) 1.
In No. 2, it is in a molten state. On the other hand, in the lower part of the slag discharge hole 3 (hereinafter referred to as the lower part of the slag discharge hole) 11, heat is taken by radiation or the like due to the influence of the low temperature cooling water 4 below, or from the upper part of the slag discharge hole 12 to the lower part of the slag discharge hole 11 The temperature decreases due to heat dissipation (the point becomes more prominent as the size of the device increases) while moving to the slag 10, which causes the slag 10 flowing out along the slag discharge hole 3 to fall below the slag discharge hole 1.
The risk of solidification near 1 increases. In order to solve this, an attempt has been made to raise the temperature of the gasification section (partial combustion section) 2. However, as described above, it is necessary to increase the amount of oxygen, which increases the non-pyrogenic substance. As a result, there arises a problem that the cold gas efficiency is lowered. Further, in this case, there is also a problem that the material of the gasification section 2 must be able to withstand higher temperatures.

In addition to the above, as a general problem related to gasification, coal is often not a uniform component (ash) at different mining sites even if it has the same type of coal, due to its nature.
Even if the temperature of the slag discharge hole 3 is kept constant, there is a problem that the flow of the slag 10 changes and stable slag discharge is impossible. Furthermore, since the slag temperature and the gasification temperature are high, it is difficult to measure them directly with a thermocouple. As a countermeasure, it may be considered to measure with a radiation thermometer, but in this case, there is a problem that it is difficult to perform accurate measurement because it is difficult to limit the blackness (emissivity).

Due to the above problems, various slag flow monitoring devices, slag blockage prevention devices, etc. have been proposed so far in order to stabilize the slag flow.
These will be described below.

In Japanese Utility Model Laid-Open No. 60-161151, a temperature detector is provided inside the lower wall of the slag discharge hole, and it is possible to selectively apply it based on the comparison information between the detected value and the separately calculated adiabatic flame temperature. There is disclosed a technique for stably discharging the generated slag without lowering the cold gas efficiency by providing the slag flow promoting means.

In Japanese Patent Laid-Open No. 1-24893, the temperature distribution obtained by imaging a slag discharge hole of a coal gasification furnace with a radiation thermometer is image-processed to destroy the slag discharge hole and stop the slag flow down. There is disclosed a technique for detecting a situation such as slag discharge hole blockage before they occur so as to accurately monitor the slag discharge hole.

In Japanese Laid-Open Patent Publication No. 1-28894, the slag dropped from the slag discharge hole of the coal gasification furnace is imaged, and the obtained image is processed to accurately diagnose the slag downflow condition and the furnace condition. Techniques for monitoring are disclosed.

In Japanese Utility Model Laid-Open No. 3-70256, the output of an optical sensor for measuring the brightness of slag activates a slag tap burner provided below a slag discharge hole of a coal gasification furnace to block the slag discharge hole. Techniques for preventing the above are disclosed.

Japanese Unexamined Patent Publication No. 60-88091 discloses a technique in which a slag that flows down is imaged by a video camera or the like, image processing is performed, and the amount of slag that flows down is measured to monitor whether the slag tap hole is blocked. Has been done.

Japanese Unexamined Patent Publication (Kokai) No. 2-115611 discloses a technique in which an optical sensor for detecting the amount of light of the slag flowing down is provided to detect blockage of the slag flow-out port and activate the slug.

[0016]

The problem shown in FIG. 13 is as follows.
Among the above-mentioned conventional techniques, the method described in Japanese Utility Model Laid-Open No. 60-161151 is provided with a slag flow monitoring device using a thermometer. With this device, by monitoring by temperature, properties such as viscosity can be estimated from the temperature of the slag, but the amount of slag flowing down, the state after cooling, etc. are not known. Also,
Even if the temperature of the slag is measured in an attempt to monitor the slag flow state, if the property of the coal species changes as described above, the slag flow state cannot be monitored even if the slag temperature is directly measured. Furthermore, if the slag covers the thermometer, the temperature cannot be measured accurately. Moreover, if the value measured by the thermometer is trusted and the amount of the oxidant supplied is increased in such a state, not only the gasification efficiency is lowered, but also the risk of damaging the gasification furnace arises. In addition, since the viscosity of the slag naturally rises immediately before the slag blockage, which is the most important factor in the slag flow monitoring device, increases the amount attached to the thermometer, so the reliability of the temperature measurement value is low. It will be even lower.

Further, even when the gas temperature in the space 40 is measured without directly measuring the temperature of the slag, char, clinker, slag, etc. adhere to the temperature, making it impossible to accurately measure the temperature.

In order to stabilize the flowing state of the slag, it is desirable to raise the slag temperature in the slag discharge hole 3 portion as high as possible. However, industrially used platinum-based thermocouples cannot be used for a long time for temperature measurement at high temperatures of 1700 ° C or more, and if they are used for a long time at 1650 ° C, they will contain a lot of errors, which will increase the reliability. Disappears.

As described above, the temperature when the slag is flowing is 1500 to
It is about 1700 ℃. In order to measure this temperature, a protective tube is usually attached to the thermocouple, but since this protective tube contains slag components such as alumina, it is melted into the slag at such temperatures, so use it for a long time in such an environment. The current situation is that the protection tube that can be used has not been developed yet.

Further, JP-A-1-24893 and JP-A-1-24893.
No. 24894, Japanese Utility Model Laid-Open No. 3-70256, JP-A-60
Although the technique disclosed in Japanese Patent No. 88091 discloses infrared light, images, and light as the measurement targets, any monitoring device detects the temperature or shape of the slag by imaging. FIG. 14 shows an example of the slag downflow monitoring device using these images. In these devices, the peep window 43 is caused by dirt such as slag, char and clinker in the coal gasification furnace.
If it is covered, the resolution is reduced and the monitoring ability is reduced. Therefore, even if the resolution is to be maintained, the gasification furnace is in a high pressure vessel of several tens of atmospheres, and the gasification furnace is filled with combustible and highly toxic gas such as CO and H ₂ . Therefore, maintenance such as cleaning of the observation window 43 cannot be easily and safely performed. Further, infrared measuring devices or image processing devices are generally expensive.

Further, in the slag monitoring apparatus by imaging, pressure glass is used for the observation window 43. In order to prevent the peephole 43 from becoming cloudy, an aspirator 45 is installed for the purpose of blowing away chars and the like, and nitrogen gas or the like is used to prevent the peephole 43 from being cleaned and soiled. This nitrogen gas cools the slag discharge hole 3 of the space 40 to increase the viscosity of the slag 10,
If the slag discharge hole 3 is clogged and the amount of oxygen is increased to maintain the temperature, the cold gas efficiency decreases. Also, if slag or clinker enters the peephole 43, it cannot be taken out during operation, so slag cannot be monitored. Further, since the amount of nitrogen gas used is increased, the concentration of nitrogen in the produced gas is increased, the calorific value of the produced gas is lowered, and the operating cost is increased.

Also in the technique disclosed in Japanese Patent Laid-Open No. 2-115611, the optical sensor must receive light through the viewing window, and the same problem as in the technique of detecting the temperature or the shape of the slag by the above-mentioned imaging occurs.

An object of the present invention is to avoid such problems caused by monitoring the slag state by temperature detection or imaging, accurately monitor the state of the slag, stop the slag flow down, close the slag discharge hole, and close the slag discharge hole. It is an object of the present invention to provide a slag flow-down monitoring method and device capable of detecting conditions such as destruction before they occur and preventing them.

[0024]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems is to provide a slag produced by melting ash content of coal burned in a coal gasification furnace from the coal gasification furnace to the coal gasification furnace. Coal gasification comprising a step of dripping into cooling water in a sink provided below the bottom of the slag and a step of detecting sound and / or vibration generated when the dripping slag lands on the cooling water. This is a method for monitoring the downflow of furnace slag.

A coal gasification furnace that burns coal, a slag discharge hole that is formed in the bottom of the coal gasification furnace and into which slag that is generated by melting the ash content of the coal is dropped, and below the bottom of the coal gasification furnace. Coal gasifier slag flow monitoring provided with a sink that is provided in the sink and is filled with cooling water, and a device that detects a sound and / or a vibration generated when the slag that drops into the cooling water in the sink is landed The device is also the present invention.

A coal gasification furnace that burns coal, a slag discharge hole that is formed in the bottom of the coal gasification furnace and into which slag generated by melting the ash content of the coal is dropped, and below the bottom of the coal gasification furnace. Coal provided with a sink filled with cooling water, a crusher for crushing the slag dropped in the cooling water in the sink, and a device for detecting sound and / or vibration generated at the time of crushing the crusher The gasifier slag flow monitoring device is also included in the present invention.

[0027] A slag flow-down promoting device for promoting the flow-down of the slag in the coal gasification furnace, and a preset pattern of sound and / or vibration detected by the device for detecting the sound and / or vibration. When it becomes, any one of the coal gasification furnace slag flow monitoring device with a controller for instructing the slag flow promoting device to start operation of the slag flow promoting device or further promote the slag flow promoting Invented.

[0028]

According to the above construction, since the state of the slag is monitored by detecting the sound and / or the vibration generated when the slag dropped on the cooling water comes into contact with the slag, the temperature of the slag can be detected as in the conventional case. It is possible to accurately monitor the slag state by avoiding the above-mentioned problems caused by monitoring the slag state by imaging.

In the case of the above-mentioned apparatus equipped with a crusher, the state of the slag is monitored by detecting the sound and / or the vibration generated when the crusher is crushed. It is possible to accurately monitor the state of the slag by avoiding the above-mentioned problems caused by monitoring the state of.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of a gasification furnace equipped with a coal gasification furnace slag flow monitoring device according to a first embodiment of the present invention. In the figure, the members having the same reference numerals as those in FIG. 11 are the same members as the conventional example already described with reference to FIG. In the first embodiment, the sound wave detector 30 is provided above the cooling water 4 of the sink 21. The sound wave detector 30 is for detecting a sound or vibration generated when the slag 10 dripped from the slag discharge hole 3 into the cooling water 4 in the sink 21 is landed. Further, the coal gasification furnace slag downflow monitoring device of this embodiment includes an amplifier 31, a frequency distribution measuring device 32, and a controller 33. However, the amplifier 31 and the frequency distribution measuring device 32 are installed to remove noise and analyze the slag flow state in each frequency range, and the sonic detector 30 alone cannot monitor the slag flow state. it can. Therefore, the amplifier 31 and the frequency distribution measuring device 32 may not be provided.

When the low-temperature slag 10 flows down from the slag discharge hole 3 and reaches the cooling water 4 of several tens of degrees Celsius, the cooling water 4 rapidly cools the slag 10 on the surface of the slag 10 and the water evaporates. The sound wave detector 30 for detecting these sounds and shock waves,
It is provided on the wall surface of the space 40 of the sink 21 for the cooling water 4. An amplifier 31 for amplifying the signal of the sound wave detector 30 is wired to the sound wave detector 30. The frequency distribution measuring device 32 for measuring the signal from the amplifier 31 is wired to the amplifier 31. Further, a controller 33 is wired to the frequency distribution measuring device 32, and the controller 33 is connected to operating devices such as the slag tap burner 15 provided on the wall surface of the space 40 and the steam flow control valve 13 provided in the line 7. ing. The slag tap burner 15 is for promoting the flow down of the slag 10 by heating.

The flowing state of the slag 10 differs depending on the melting temperature of the coal species used as fuel. However, it goes without saying that the slag 10 has a lower viscosity at a higher temperature and a smoother flowing state. According to the experiments conducted by the present inventors, changes in the slag landing sound or vibration due to changes in the properties and the flowing state of the slag 10 are as shown in FIGS. 6-10,
It is a graph which shows the time-dependent change of the magnitude | size of a sound or a vibration at the time of slag 10 water landing, or a frequency. As is clear from the figure,
When the amount of slag flowing down decreases, the amount of boiling of the cooling water 4 also decreases, so the magnitude of sound and vibration becomes smaller, and the frequency becomes slightly lower (see FIG. 6). When the temperature of the slag 10 becomes low, the boiling amount of the cooling water 4 becomes small, the magnitude of sound or vibration becomes slightly small, and the frequency becomes low (see FIG. 7). When the viscosity of the slag 10 is increased by changing the composition of the coal, the size of sound or vibration is slightly reduced,
The frequency becomes lower (see FIG. 8). Next, slag 1 after landing
For the shape of 0, the landing sound or vibration of the slag 10 was as follows. First, when the slag 10 is in the shape of a chip, a sound or vibration that is broken by thermal stress after the water has landed on the slag 10 is detected, and a pulse-shaped sound or vibration can be confirmed by the frequency distribution measuring device 32. Since this sound or vibration is higher and louder than the slag landing sound or vibration, a mountain-shaped waveform appears (see FIG. 9). Further, in the case of a linear slug, the above-mentioned mountain-shaped waveform does not appear (see FIG. 10).

Next, when the magnitude and frequency of the landing sound or vibration of the slag 10 become large, it is appropriate to take measures such as changing the gasification operating conditions or starting the slag tap burner 15. , The data obtained from the experimental results will be explained. For example, in the case of Taiheiyo Coal, the frequency of sound or vibration emitted when landing on the cooling water 4 at 1500 ° C. was 5 to 10 kHz. In case of 1450 ℃, it is almost 5kHz
It was below. For this reason, it is necessary to take measures to prevent the slag discharge hole 3 from being blocked when the frequency becomes 5 kHz or less from the condition of decreasing the slag temperature.

Regarding the magnitude of sound and vibration, in the experimental apparatus used by the present inventors, the slag flow rate started to decrease when it became approximately -10 dB or less and stopped at approximately -30 dB. It was necessary to take measures to prevent the slag discharge hole 3 from being blocked when the magnitude of sound or vibration decreased to -30 dB or less. Such a value depends on the characteristics of the individual coal gasifier.

As described above, the slag 10 to be dripped is determined by the change in the magnitude of sound and vibration and the frequency of the slag 10 when it comes in contact with water.
Of the slag 1
The slag 10 which has a risk of blockage of 0. The magnitude of the sound and vibration when landing on the water, and the temporal change pattern of the frequency are previously set in the controller 3
Set it to 3, and when this change pattern is reached,
The gasification operating condition is changed by the valve 13 or the slag tap burner 15 is activated.

Next, the operation of this embodiment will be described.
When coal is gasified by the same method as the conventional example described with reference to FIG. 6 with the above-described configuration, the slag 10 flows down from the slag discharge hole 3 and lands on the cooling water 4. At this time, slag 10
The temperature of 1000 ~ 1500 ℃. The slag 10 is rapidly cooled by the cooling water 4, and a slag landing sound and a shock wave are generated, which propagate to the wall surface of the space 40 and appear as sound and vibration. This sound or vibration is detected by the sound wave detector 30, amplified by the amplifier 31, analyzed by the frequency distribution measuring device 32, and the preset magnitude of sound and vibration at the time of landing of the slag 10 and the temporal change pattern of the frequency. When it becomes, operate the slag tap burner 15 etc. with the controller 33 to raise the temperature of the slag 10,
The flow down of the slag 10 is promoted. As described above, in the present embodiment, since the flowing state of the slag 10 is monitored by the sound and vibration when the slag 10 reaches the water, it is caused by the temperature detection of the slag 10 and the monitoring of the state of the slag 10 by imaging. Avoiding conventional problems, accurately monitoring the state of the slag 10, detecting conditions such as slag flow stop, blockage of the slag discharge hole 3 and destruction of the slag discharge hole 3 before they occur and prevent them in advance. be able to.

Next, a second embodiment of the present invention will be described. FIG. 2 is a vertical cross-sectional view of a part of a gasification furnace equipped with the coal gasification furnace slag flow monitoring device according to the second embodiment. In this embodiment, the sound wave detector 30 is waterproofed and directly immersed in the cooling water 4. The other points are similar to those of the first embodiment,
The description is omitted. Since the sound wave detector 30 is submerged in water,
Since the temperature of the sound wave detector 30 becomes 100 ° C. or lower and the heat resistance of the sound wave detector 30 does not have to be taken into consideration, the cost can be reduced. In addition, since it is in the cooling water 4, it is possible to directly measure the sound and vibration in the water without passing through the wall surface of the space portion 40 of the sink 21 of the cooling water 4, and to prevent the adhesion of char, slag, clinker, etc. Reliability is improved without worry.

Next, a third embodiment of the present invention will be described. FIG. 3 is a vertical cross-sectional view of a part of a gasification furnace equipped with a coal gasification furnace slag flow monitoring device according to the third embodiment. In this embodiment, similarly to the second embodiment, the sound wave detector 30 is waterproofed and submerged in the cooling water 4. Moreover, the cooling water supply nozzle 41 is arranged in front of the sound wave detector 30. The other points are the same as those of the first embodiment, and the description thereof will be omitted. With such a configuration, each time the cooling water 4 is supplied, as shown in FIG.
As shown by the middle arrow, cooling water can be sprayed onto the acoustic wave detector 30 to wash the acoustic wave detector 30, which makes maintenance free and improves reliability.

Further, a fourth embodiment of the present invention will be described. FIG. 4 is a vertical cross-sectional view of a part of a gasification furnace equipped with the coal gasification furnace slag flow monitoring device according to the fourth embodiment. In this embodiment, the sound wave detector 30 is submerged in water or installed in the space 40. In this embodiment, a ball valve 41 is provided at the mounting portion of the sound wave detector 30.
It can be replaced without stopping the gasification furnace. FIG. 4 shows an example in which the sound wave detector 30 is submerged. The other points are the same as those of the first embodiment, and the description thereof will be omitted. With such a configuration, it is not necessary to interrupt the operation of the gasification furnace even when maintenance is required due to damage due to heat or stains.

Finally, a fifth embodiment of the present invention will be described. FIG. 5 is a vertical cross-sectional view of a part of a gasification furnace equipped with a coal gasification furnace slag flow monitoring device according to the fifth embodiment. In this embodiment, the slag flow monitoring device according to the second embodiment is installed in the coal gasification furnace in which the crusher 34 is installed in the sink 21 of the cooling water 4. The crusher 34 is installed to crush fine thread-like slag and large slag, and is disclosed in, for example, Japanese Utility Model Laid-Open No. 2-90641. The other structure is similar to that of the second embodiment, and the description thereof is omitted. In this embodiment, the slag 10 is crushed by the teeth of the rotating crusher 34. The sound of crushing by the crusher 34 can be detected by the sound wave detector 30. When the crushing sound is measured by the frequency distribution measuring device 32, the crushing sound is 10 to 20.
Appears in the frequency range of kHz. When the crushing sound or the like is detected, it is confirmed that the slag 10 is flowing down. Therefore, when the frequency range of 10 to 20 kHz is no longer detected, the controller 33 may operate the slag tap burner 15 or the like to raise the temperature of the slag 10.

[0041]

According to the present invention described above, the state of the slag is monitored by detecting the sound and / or the vibration generated when the slag dropped on the cooling water comes into contact with water as described above. As described above, it is possible to accurately monitor the state of the slag by avoiding the above-mentioned problems caused by monitoring the state of the slag by detecting the temperature of the slag, capturing the image, or the like.

[Brief description of drawings]

FIG. 1 is a system diagram of a gasification furnace equipped with a coal gasification furnace slag downflow monitoring apparatus according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a part of a gasification furnace equipped with a coal gasification furnace slag downflow monitoring apparatus according to a second embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a part of a gasification furnace equipped with a coal gasification furnace slag downflow monitoring apparatus according to a third embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view of a part of a gasification furnace equipped with a coal gasification furnace slag downflow monitoring apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a part of a gasification furnace equipped with a coal gasification furnace slag downflow monitoring apparatus according to a fifth embodiment of the present invention.

FIG. 6 is a graph showing a time-dependent change in the magnitude or frequency of sound or vibration when the slag is landed on water in the first embodiment of the present invention.

FIG. 7 is a graph showing a time-dependent change in the magnitude or frequency of sound or vibration when the slag is landed in the first embodiment of the present invention.

FIG. 8 is a graph showing changes over time in the magnitude or frequency of sound or vibration when the slag is landed in the first embodiment of the present invention.

FIG. 9 is a graph showing a time-dependent change in the magnitude and frequency of sound or vibration when the slag is landed in the first embodiment of the present invention.

FIG. 10 is a graph showing a time-dependent change in the magnitude and frequency of sound or vibration when the slag lands in the first embodiment of the present invention.

FIG. 11 is a system diagram of a conventional spouted bed coal gasification furnace.

FIG. 12 is an enlarged cross-sectional view of a slag discharge hole portion of a conventional spouted bed coal gasification furnace.

FIG. 13 is a system diagram of a gasification furnace equipped with a conventional slag flow monitoring device using a thermometer.

FIG. 14 is a vertical cross-sectional view of a part of a gasification furnace equipped with a conventional slag flow monitoring device by imaging.

[Explanation of symbols]

 1 Gasification furnace 2 Gasification part (partial combustion part) 3 Slag discharge hole 4 Cooling water 5 Pulverized coal supply line 6 Oxygen-containing gas supply line 7 Steam supply line 8 Gas discharge line 9 Discharge port 10 Slag 11 Lower part of slag discharge hole 12 Upper part of slag discharge hole 13 Steam flow rate control valve 14 Thermocouple 15 Slag tap burner 16 Thermometer 17 Gas flow rate control valve 18 Gas extraction line 19 Temperature detector 20 Flux supply line 21 Sink 24 Control device 25 Steam flow rate control device 26 High temperature partial combustion Gas extraction valve opening adjustment device 27 Burner point / extinguishing control device 28 Flux agent addition device 29 Fuel supply control valve 30 Sound wave detector 31 Amplifier 32 Frequency distribution measuring device 33 Controller 34 Crusher 40 Space 41 Cooling water supply nozzle 42 Ball Valve 43 Peep window 44 Imaging Device 45 Aspirator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuntaro Koyama 7-1-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Hitachi Research Laboratory (72) Inventor Fumihiko Hanayama 3-1, Nakasode, Sodegaura-shi, Chiba Coal Utilization Hydrogen Manufacturing Technology Research Association Driving Research Institute

Claims (4)

[Claims] 1. A slag generated by melting ash content of coal burned in a coal gasification furnace is dripped from the coal gasification furnace into cooling water in a sink provided below the bottom of the coal gasification furnace. A coal gasifier slag downflow monitoring method comprising the steps of: (1) and a step of detecting a sound and / or a vibration generated when the dropped slag reaches the cooling water. 2. A coal gasification furnace that burns coal, a slag discharge hole into which a slag generated by melting the ash content of coal is pierced at the bottom of the coal gasification furnace, and the bottom of the coal gasification furnace. Coal gasifier slag provided with a sink provided below the cooling water and filled with cooling water, and a device for detecting sound and / or vibration generated when the slag that drops into the cooling water in this sink is landed Downflow monitoring device. 3. A coal gasification furnace that burns coal, a slag discharge hole into which a slag generated by melting the ash content of coal is pierced at the bottom of the coal gasification furnace, and the bottom of the coal gasification furnace. A sink provided under the cooling water, filled with cooling water, a crusher for crushing the slag dropped in the cooling water in the sink, and a device for detecting sound and / or vibration generated at the time of crushing the crusher. Coal gasifier slag downflow monitoring device. 4. A slag flow promoting device for promoting the flow down of the slag in the coal gasification furnace and a sound and / or vibration detected by a device for detecting the sound and / or vibration are preset. The control device for instructing the slag flow-down promoting device to start operation of the slag flow-down promoting device or further promote the slag flow-down when a pattern is formed. Coal gasifier slag downflow monitoring device.