JPH0774345B2 - Slag flow monitor for coal gasifier - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spouted bed coal gasification furnace, and more particularly to a device for monitoring the discharge status of molten slag from the gasification section of the gasification furnace.

[0002]

2. Description of the Related Art Conventionally, a slag flow monitoring device in a spouted bed type coal gasification furnace has a structure as shown in FIG. That is, the gasification section a, the hearth plate c, and the slag cooling section b are provided,
The slag cooling part b is composed of a space part e and a water tank f.
A tip portion h of a fiberscope g is attached to the space portion e so as to look into the interior from the inner wall of the refractory material, and the flowing state of the molten slag k falling from the slag tap d of the hearth plate c is monitored. Then, the nitrogen gas from the nitrogen gas line 1 is fed with the nitrogen gas from the nitrogen gas line 1 so that the glass at the tip end h of the fiberscope g is not contaminated by floating dust or the like.
From the inner wall of the refractory material and the tip end h of the fiberscope g was previously installed. In addition, i is a water supply line to the water tank f, and j is a drainage line.

[0003]

As described above, in this space portion e, high-concentration suspended dust and char are scattered, and the tip end portion h of the fiberscope g cannot be sufficiently monitored. Nitrogen gas was purged from the tip h of g to remove dirt. However, since this method purges a large amount of nitrogen gas, the slag tap d of the hearth plate c is cooled more than necessary, and the hearth plate c of the molten slag k is cooled.
However, there is a problem that the molten slag k cannot be stably flowed down. Further, if the tip end h of the fiberscope g is installed so as to be retracted from the inner wall of the refractory material in advance, the field of view becomes extremely narrow, and there is a problem that the flow down state of the molten slag k cannot be sufficiently grasped.

An object of the present invention is to provide an apparatus for monitoring the discharge status of molten slag flowing down from a gasification section in a jet-bed type coal gasification furnace by a sensor, without the molten slag sticking to the hearth plate The present invention is to provide a device for preventing the molten slag from being contaminated by foreign matter such as dust, grasping the molten slag flow condition of the entire hearth plate slag tap, and thereby stably flowing the molten slag of the coal gasification furnace.

[0005]

To achieve the above object, the first invention of the present application cools the molten slag by dropping it into a water tank while monitoring the flow-down state of the molten slag falling from the gasification section with a sensor. In the coal gasification furnace, the sensor tip is arranged in the water in the water tank.

The second invention of the present application is the same as the first invention of the present application.
A cleaning means for applying cleaning water to the tip of the sensor is provided.

The third invention of the present application is the same as the second invention of the present application.
The cleaning means also serves as a water supply means to the slag cooling section water tank.

According to a fourth invention of the present application, in the second or third invention of the present application, the cleaning means is provided with a jacket cylinder around the long sensor and spaced apart from the sensor, and the jacket cylinder and the sensor. The cleaning water flows through the gap.

[0009]

[Function] Since the sensor tip portion for monitoring the flow down condition of the molten slag falling from the gasification portion is arranged in the water in the slag cooling portion water tank, the sensor tip portion is the same as the conventional slag cooling portion space. Even if water is not contaminated by suspended dust or the like and solid matter is mixed in the water in the water tank, it is relatively transparent, and the flowing state of the molten slag can be well monitored through this water.

Further, since the sensor tip portion is provided with a cleaning means for applying washing water, solid matters and the like settled and accumulated on the sensor tip portion are removed, and the suspended solid matter in water is kept away from the sensor tip portion. .

Further, since the cleaning means also serves as a water supply means to the water tank of the slag cooling section, the structure is simple and the manufacture is easy in addition to the above-mentioned operation.

Since the cleaning means is provided with a jacket cylinder around the long sensor and apart from the sensor, and the cleaning water flows through a gap between the jacket cylinder and the sensor. It has the same effect.

[0013]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an example of a slag flow monitoring device in a spouted bed type coal gasification furnace of the present invention.

This figure mainly shows the lower structure of the jet bed type coal gasification furnace. The gasification section 2 and the slag cooling section 3 are shown.
And the space between them is divided by the hearth plate 4. The slag cooling section 3 includes a space section 5 and a water tank 6 filled with quench water, a crusher 7 is provided under the water tank 6, and a slag discharge nozzle 8 is provided under the crusher 7, and the entire casing 12 is provided.
It is surrounded by. The gasification section 2 is lined with a refractory material 11, and is provided with a water cooling pipe 10 for cooling that protects the refractory material 11, a coal supply burner (not shown), and the like. Incidentally, 9 is a header. The hearth plate 4 includes a plurality of slag taps 4 that perform self-circulation heating to prevent slag cooling and solidification.
a and a gas tap 4b. Slag cooling unit 3
Is lined with a refractory material 11 like the gasification section 2, and the space section 5 has a starter burner 17 connected to a fuel line 18 using oils as fuel and an air line 19, and burner combustion at start-up. It is a room. In the water tank 6, a fiberscope (hereinafter referred to as "fiberscope 13") which is a sensor 13 connected to the camera 15 and the monitor 16 and connected to the water supply line 14 is provided as a protective casing 13c.
Is installed through. Further, a water level detection seat 22 for detecting the water level, a drainage line 20 including a flow control valve 21 and a controller 23 for automatically adjusting the water level to drain water are attached.

Next, the operation of this apparatus will be described. In the coal gasification furnace 1, the molten slag 24 generated in the gasification section 2 flows down from the slag tap 4a and the slag cooling section 3
It falls into the quench water in the water tank 6 and is instantly cooled.
Due to the thermal shock at this time, the molten slag 24 is crushed, that is, water-crushed to become the water-crushed slag 25. The uncrushed slag is 10m in size due to the crusher 7 attached to the lower part of the water tank.
Fine-grained slag 26 having a size of m or less is taken out from the slag discharge nozzle 8.

In the operation of the coal gasification furnace 1, it is necessary to grasp the flow-down state of the molten slag 24 and adjust the temperature so that the molten slag 24 can flow down stably. Therefore, fiberscope 13
The front end 13a of the molten slag 24 is placed in the water of the water tank 6, and the monitor 16 through the camera 15 monitors the flowing down state of the molten slag 24. As described above, since the tip portion 13a of the fiberscope 13 is placed in the water in the slag cooling portion water tank 6, it is not contaminated by the floating dust or the like in the slag cooling portion space portion 5 as in the conventional case. Further, since the slag and other solid matters in the water tank 6 are constantly moving and the water is relatively transparent, the flowing down state of the molten slag 24 is monitored through this water. The molten slag 24 has a temperature of about 140.
Since it is a high temperature of 0 to 1700 ° C, it is easy to see, and below the water surface 6a 5
If the water level is about 0 mm, it is possible to sufficiently monitor the flowing state of the molten slag 24 even from the water.

Next, by providing a cleaning means for applying cleaning water to the tip portion 13a of the fiberscope 13, it is possible to prevent sedimentation and accumulation of solid matter mixed in water. As the cleaning means, a part of the water from the water supply line i in the conventional apparatus of FIG. 3 may be piped as cleaning water and applied to the tip portion 13a of the fiberscope 13, or as shown in FIG. The water tank 6 may also serve as a water supply means.

The cleaning means shown in FIG. 1 has a structure as shown in FIG. 2, and is provided with a fiberscope 13 and an outer cylindrical body 13b spaced apart from the fiberscope 13 and the fiberscope 13. It is housed in a protective casing 13c integrally with the outer tubular body 13b and attached to the side wall of the coal gasification furnace 1. And the water supply line 14
The cleaning water 14a from the above flows to the tip portion 13a along the gap between the fiberscope 13 and the outer cylinder body 13b, and cleans the tip portion 13a. The shape of the tip of the jacket tube 13b is such that the jacket tube 13b is slightly longer than the tip end 13a of the fiberscope 13, as shown in FIG. 2, so that the cleaning water 14a hits the tip 13a of the fiberscope 13. It has a bent shape.

Although the water level in the water tank 6 must be kept constant, the water tank 6 is fed from the tip portion 13a of the fiberscope 13.
By the drainage commensurate with the rising water level due to the water supply to
The water level in the aquarium 6 is kept constant.

[0020]

According to the first invention of the present application, since the sensor tip portion is arranged in the water in the slag cooling portion water tank, it is contaminated by the floating dust or the like in the space portion of the slag cooling portion as in the conventional case. And the molten slag is not fixed to the hearth plate. Also, the slag and other solids in the water tank are constantly moving, and even if the solids are mixed in the water in the water tank, it is relatively transparent, so the flow of molten slag through this water is good. Can be monitored.

According to the second invention of the present application, since the tip of the sensor is provided with the washing means for applying washing water, in addition to the effect of the first invention of the present application, the tip of the solid matter mixed in the water is provided. There is no sedimentation or deposition on the tip, and the suspended solids in water are kept away from the tip, so the sensor tip can be cleaned reliably.

According to the third invention and the fourth invention of the present application, the cleaning means also serves as water supply means to the slag cooling section water tank.
The tip of the sensor is cleaned by supplying water to the water tank of the slag cooling unit, and further the cleaning water flows toward the tip along the gap between the outer cylinder and the sensor, and is sprayed from this tip to be washed. Therefore, in addition to the effects of the first invention and the second invention of the present application, the device becomes simple and the manufacture is easy.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an example of a slag flow-down monitoring device for a coal gasification furnace of the present invention.

FIG. 2 is an enlarged cross-sectional view illustrating cleaning of the sensor tip portion in FIG.

FIG. 3 is a diagram illustrating a conventional slag flow monitoring device for a coal gasification furnace.

[Explanation of symbols]

 1 Coal Gasifier 2 Gasifier 3 Slag Cooler 4 Hearth Plate 4a Slag Tap 5 Space 6 Water Tank 13 Sensor 13a Tip 13b Outer Cylinder 13c Protective Casing 14 Water Supply Line 14a Wash Water 24 Molten Slag

Claims (4)

[Claims] 1. A slag flow monitoring device for a coal gasification furnace, which cools the molten slag by dropping it into a water tank while monitoring the flow down state of the molten slag falling from a gasification section by a sensor, wherein the sensor tip is And a slag flow monitoring device for a coal gasifier, which is disposed in water in the water tank. 2. The slag flow monitoring device for a coal gasification furnace according to claim 1, further comprising cleaning means for applying cleaning water to a tip portion of the sensor. 3. The apparatus for monitoring slag flow of a coal gasification furnace according to claim 2, wherein the cleaning means also serves as water supply means to the slag cooling section water tank. 4. The cleaning means according to claim 2 or 3, wherein the cleaning means is provided with a jacket cylinder around the long sensor and spaced from the sensor, and a gap between the jacket cylinder and the sensor is cleaned with cleaning water. A slag downflow monitoring device for a coal gasification furnace, characterized in that