JP2006097909A - Molten material granulating cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for easily granulating and cooling a molten material cindered and discharged from a waste melting furnace directly melting non-industrial wastes and industrial wastes, without using a device of complicated structure. <P>SOLUTION: In this granulating cooling device for the molten material discharged from the melting furnace, comprising a molten material flow channel air-tightly connected with the melting furnace for disposing the non-industrial wastes and industrial wastes, a molten material dropping cooling pipe air-tightly connected with the molten material flow channel, and a water tank mounted at a lower part of the molten material dropping cooling pipe and storing the water in a state of keeping water sealing of furnace inner pressure, the inside of the molten material dropping cooling pipe is composed of a water wetted wall. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an apparatus for granulating and cooling a molten material discharged from a melting furnace in a waste melting furnace for directly melting general waste and industrial waste.

  Conventionally, as a processing apparatus for a melt discharged from a waste melting furnace, for example, Patent Document 1 discloses that granulated slag is granulated without forming a needle shape or an acute lump shape, and a particle size of a flag. When the molten slag discharged from the ash melting furnace is subjected to water granulation, the water temperature of the water sprayed from the nozzle by the water granulated water injection pump and the water storage tank should be in the range of 60 to 85 ° C. Are listed.

  Patent Document 2 discloses a solidified product obtained by cooling a molten material composed of slag and metal discharged from a discharge port into water and granulating it in the treatment of the discharged molten material from a melting furnace that directly melts waste. The granulated solidified material is separated into two stages of fine particles and coarse particles using a particle size sorter, and the slag solidified material is finely divided into fine particles. The waste melting furnace water is recovered by separating and further collecting the solidified material of the slag efficiently in a slag receiving container by magnetically separating only the fine-grained solidified material by a magnetic separator and removing the solidified material of the metal. A method for separating crushed slag is described.

  In Patent Document 3, in order to smoothly and continuously discharge the molten material such as slag and metal generated in the waste melting furnace from the melting furnace to the recovery device, the structure of the melt outlet of the melting furnace is melted. Formed with a flow channel for flowing the melt provided at the lower part of the furnace, a metal water-cooled jacket, and a cylindrical outlet for dropping the melt vertically from the tip of the channel, and a vertical wall of the cylindrical outlet It is described that it comprises a plurality of water injection nozzles that are provided and spray cooling water on the melt, and a melt recovery tank disposed below the cylindrical outlet.

Patent Document 4 is an apparatus similar to the apparatus described in Patent Document 3, wherein the upper end height of the metal water cooling jacket on the side on which the melt flows is made lower than that on the opposite side, and the melt flows. It is described that a collar is provided on the upper part of the metal water cooling jacket on the incoming side.
However, the above-described conventional methods have a problem that the structure of the apparatus is complicated and control is difficult.

Japanese Patent No. 3091161 Japanese Patent No. 3374709 JP 2002-349839 A JP 2003-314969 A

  An object of the present invention is to provide an apparatus for easily granulating and cooling a molten material discharged from a waste melting furnace for directly melting general waste or industrial waste without using a complicated structure apparatus. And

As a result of intensive studies to solve the above problems, the present inventors have obtained the following knowledge.
(1) Since the amount of slag discharged from the waste melting furnace is small, it is considerably granulated by dripping and dropping over a long distance (for example, 4 m), enters a water tank, partially breaks and further granulates, and is suitable for use. (If a large amount of slag falls, it will be difficult to granulate, but if it falls in a small amount, it will granulate. On the other hand, if it is too small, agglomeration will occur at the dropping port and stable continuous granulation cannot be achieved.)
(2) When the melt falls for a long distance, it drops into an appropriate particle diameter (stabilized particle diameter) by its surface tension, and solidifies or enters the water tank and solidifies in that state.
(3) When a wetting wall is provided in the fall path, the wet wall promotes radiative cooling and prevents metal and slag from adhering to the wall.
(4) The chopper reduces troubles (occurrence of icicles) due to melt agglomeration at the start of dropping.
(5) Additional water jet promotes granulation.

The present inventors have completed the present invention based on the above findings, and the invention is as follows.
(1) A melt flow path sealed and connected to a melting furnace, a melt drop cooling pipe sealed and connected to the melt flow path, a furnace disposed below the melt drop cooling pipe, and a furnace An apparatus for granulating and cooling a melt discharged from the melting furnace, comprising a water tank in which water is stored so as to maintain a water seal with an internal pressure, wherein the inside of the melt drop cooling pipe is wet with water A granulated cooling device for a melt characterized by being a wall.
(2) The melt granulation cooling apparatus according to (1), wherein a melt drop distance in the melt drop cooling pipe is 2 m or more.
(3) The melt granulation cooling apparatus according to (1), wherein a melt drop distance in the melt drop cooling pipe is 4 m or more.
(4) The melt granulation cooling apparatus according to any one of (1) to (3) above, wherein a falling flow rate of the melt is 0.01 kg / second to 2.0 kg / second.
(5) The melt according to any one of (1) to (4) above, wherein a chopper for intermittently cutting the fallen melt is disposed above the melt drop cooling pipe. Granulation cooling device.

(6) The granulation of the melt according to any one of the above (1) to (5), wherein the water of the wet wall of the melt drop cooling pipe is a circulating water of the water tank. Cooling system.
(7) The water intake for forming the water wetting wall is set near the water surface portion of the water tank, and a filtration system for circulating the water in the water tank in the vicinity of the water intake is separately provided, and the granulated melt is supplied to the water intake The melt granulation cooling apparatus according to the above (6), characterized in that the inflow of the melt is reduced.
(8) A water injection mechanism for directly cooling the fallen melt in the melt drop cooling pipe is provided. The melt according to any one of (1) to (7), Granulation cooling device.
(9) The melt granulation cooling apparatus according to any one of (1) to (7), wherein the melt drop cooling pipe has a water cooling jacket structure.
(10) The melt granulation cooling apparatus according to any one of (1) to (9), wherein the melting furnace is a waste gasification melting furnace or a gasification melting reforming furnace.

  According to the present invention, a simple apparatus is used to obtain a granular material having a relatively uniform particle size, which can be reused as a resource, from a melt discharged from a waste melting furnace that directly melts general waste and industrial waste. Can be manufactured.

The melt granulation cooling device of the present invention can be used, for example, by being attached to a slag homogenization step in a gasification reforming type waste treatment furnace as shown in the figure.
The gasification reforming system shown in the figure is composed of the following processes.
1. 1. Press and degas channel (1) Waste compression, (2) Drying and pyrolysis 2. High-temperature reactor / homogenization furnace (3) Gasification and melting, (4) Slag homogenization, (5) Gas reforming Gas purification (6) Rapid cooling (rapid cooling / acid cleaning, acid cleaning), (7) Gas purification (alkali cleaning, desulfurization, dehumidification)
4). Water treatment (8) Water treatment (precipitation, desalination, etc.)

Next, an outline of the melt granulation cooling device of the present invention is shown in FIG.
A melt drop cooling pipe (hereinafter referred to as “fall cooling pipe”) 2 is connected to the molten slag discharge port 4 of the homogenizing furnace 1, and a chopper 3 is provided above the drop cooling pipe 2. The lower end of the drop cooling pipe 2 is submerged in the water in the water tank 6 to maintain a water seal at the furnace pressure. From the molten slag discharge port 4 of the homogenization furnace 1 to the water surface in the drop cooling pipe 2 This distance is the fall distance of the melt. The solidified slag discharged from the lower end of the fall cooling pipe 2 and precipitated in the water tank is carried out of the water tank 6 by the slag conveyor 5.

  The water in the water tank 6 is supplied to the wall surface of the drop cooling pipe 2 through the suction strainer 7, the pump 8, and the cooler 9 to form a wet wall. The water in the water tank is sent from the intake 11 to the filter 13 via the pump 12 to remove the granulated melt and returned to the water tank 6. The water intake 10 is provided in the vicinity of the water surface portion of the water tank, while the water intake 11 is disposed at a position deeper than the intake 10 of the wet wall feed water.

This will be described in more detail with reference to FIG.
The molten slag discharged from the homogenizing furnace 1 forming the melt flow path falls in the fall cooling pipe 2 and is granulated in the process of dropping to enter the water tank (slag cooling tank) 6. At this time, the falling distance of the molten slag is preferably 2 m or more, more preferably 4 m or more.
This is because the longer the slag fall distance, the more the granulation is promoted. Further, when entering the aquarium 6, a part of the slag is broken and further granulated to have a particle size suitable for use. This is because it is remarkably exhibited. Also, if the drop distance is 4m or more, the surface tension effect will work sufficiently, large drops will be divided into several appropriate sizes, and spherical ones will easily fall into water, and metal and slag And it is crushed by rapid cooling into crushed particles with a particle size of 5 mm or less, and subsequent processes (for example, the process of producing various types of eco-slag (such as soil conditioners) by grinding) It is because it becomes suitable for.

  It is preferable to adjust the falling flow rate of the molten slag to 0.01 kg / second to 2.0 kg / second. This is because when a large amount of molten slag flows, it may drop and fall into the water, and a steam explosion may occur. This is because it may cause

  It is preferable to supply the water in the water tank to the wall surface of the drop cooling pipe 2 through the suction strainer 7, the pump 8, and the cooler 9 to form a wet wall. As a result, radiation cooling of the molten slag is promoted and metal or slag can be prevented from adhering to the wall surface. Further, it is preferable to provide a water injection mechanism for spraying water onto the falling melt in the falling cooling pipe. Thus, granulation is further accelerated | stimulated by injecting water to a fall melt and cooling a melt directly. From the viewpoint of saving water, it is preferable to circulate and use water in the water tank as the water for forming the jet water and the wet wall.

The lower end of the fall cooling pipe 2 is submerged in the water of the water tank 6 and needs to be sealed with water. This is to prevent the toxic gas and combustible gas generated in the furnace from being ejected from the lower end of the falling cooling pipe 2 and to prevent the O ₂ gas in the atmosphere from entering the furnace during troubles. It is.

  It is preferable to provide a chopper 3 in the vicinity of the upper end of the drop cooling pipe 2 for intermittently cutting the fall melt. This is to prevent icicle growth due to molten slag and to avoid the trouble of closing the drop opening. The chopper 3 is washed and cooled with water as shown in the figure.

  The water intake 10 for supplying the water for forming the water wetting wall is provided near the water surface of the water tank 6, and filtration systems 12 and 13 for circulating the water in the water tank in the vicinity of the water intake 10 are separately provided. It is preferable to remove the granulated melt.

  This is because the inflow of the granulated melt floating in the granulated water can be reduced by taking in the water for forming the wetting wall from the vicinity of the water surface of the aquarium, thereby clogging the suction strainer 7, pump 8, cooling This is because troubles such as wear and clogging of the vessel 9 can be suppressed. Moreover, since the granulated melt suspended in the water in the aquarium becomes smaller as it approaches the surface layer, the intake of the wet wall feed water is arranged near the surface, and the intake 11 of the filtration system is the intake 10 of the wet wall feed water. It is desirable to arrange at a deeper position.

  FIG. 3 is a diagram showing details of the drop cooling pipe and the slag conveyor shown in FIG. As shown in the figure, the distance from the slag discharge port of the homogenizing furnace 1 to the inner water surface of the falling cooling pipe is the falling distance of the melt.

FIG. 4 shows an end structure of the drop cooling pipe 2 for forming a wet wall. Circulating water from the water tank enters the casing 14 from the circulating water inlet 15 provided in the casing 14 formed at the upper end of the drop cooling pipe 2, passes through the upper end of the falling cooling pipe 2, and falls from the circulating water outlet 16 to the falling cooling pipe. Flow down the inner wall of 2 to form a wet wall.
Moreover, the cooling capacity in the drop cooling pipe can be further enhanced by adopting a water cooling jacket structure for the drop cooling pipe 2.

  FIG. 5 is a view showing the structure of the chopper 3. The chopper 3 is provided with a cleaning nozzle 17 that uses the circulating water in the water tank 6 as cleaning water, and the chopper 3 is cleaned and cooled.

In a gasification reforming type waste treatment furnace (thermoselect furnace), granulation cooling of the melt was performed using the apparatus shown in FIGS.
This thermoselect furnace is a homogenization furnace and has a temperature of 1600 ° C. The temperature near the outlet is a little lower than this, and it is continuously discharged. In the 100 t furnace, the flow rate was constant to a certain degree with a falling flow rate of 0.12 kg / sec, and the furnace internal pressure was 2000 mmAq at the outlet. The fall distance of the melt is about 4.5 m.
The slag composition was SiO ₂ = 35%, Al ₂ O ₃ = 19%, CaO = 22%, MgO = 3%, Fe ₂ O ₃ = 17%.
As a result of the operation with this apparatus, the obtained granulated slag was mainly composed of particles having a particle diameter of 2 mm or less, and the particle diameter was relatively uniform, and good results were obtained.

  The melt granulation cooling apparatus of the present invention can easily granulate a melt generated in a waste gasification melting furnace or gasification melting reforming furnace.

It is a figure which shows the outline | summary of the waste processing by a gasification reforming system. It is a figure which shows the outline | summary of the granulation cooling apparatus of this invention. It is a figure which shows a part of granulation cooling apparatus of this invention in detail. It is a figure which shows the structure of the upper end part of the fall cooling pipe of the granulation cooling apparatus of this invention. It is a figure which shows the structure of the chopper in the granulation apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Homogenization furnace 2 Fall cooling pipe 3 Chopper 4 Molten slag discharge port 5 Slag conveyor 6 Water tank 7 Suction strainer 8 Pump 9 Cooler 10 Intake port 11 Intake port 12 Pump 13 Filter 14 Casing 15 Circulating water inlet 16 Circulating water outlet 17 Nozzle for cleaning

Claims (10)

  A melt flow path hermetically sealed and connected to the melting furnace, a melt drop cooling pipe hermetically connected to the melt flow path, and a water having a pressure in the furnace disposed below the melt drop cooling pipe A granulation cooling device for the melt discharged from the melting furnace, comprising a water tank in which water is stored so as to maintain a seal, wherein the inside of the melt falling cooling pipe is a wetting wall of water An apparatus for granulating and cooling a melt.   The melt granulation cooling apparatus according to claim 1, wherein a melt fall distance in the melt fall cooling pipe is 2 m or more.   The melt granulation cooling apparatus according to claim 1, wherein a melt drop distance in the melt drop cooling pipe is 4 m or more.   The apparatus for granulating and cooling a melt according to any one of claims 1 to 3, wherein a falling flow rate of the melt is 0.01 kg / sec to 2.0 kg / sec.   The melt granulation cooling apparatus according to any one of claims 1 to 4, wherein a chopper for intermittently cutting the fall melt is disposed on the melt fall cooling pipe.   The melt granulation cooling apparatus according to any one of claims 1 to 5, wherein the water of the wet wall of the melt falling cooling pipe is water circulating in the water tank.   The water intake for forming the water wetting wall is located near the surface of the water tank, and a separate filtration system for circulating the water in the water tank near the intake is provided to allow the granulated melt to flow into the water intake. The melt granulating and cooling apparatus according to claim 6, wherein the phenomenon is reduced.   The melt granulation cooling apparatus according to any one of claims 1 to 7, wherein a water injection mechanism for directly cooling the falling melt in the melt falling cooling pipe is provided.   The melt granulation cooling apparatus according to any one of claims 1 to 7, wherein the melt drop cooling pipe has a water cooling jacket structure.   10. The melt granulating and cooling apparatus according to claim 1, wherein the melting furnace is a waste gasification melting furnace or a gasification melting reforming furnace.

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