JPS62171949A - Water granulation equipment for waste molten slag - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a waste molten slag water crushing apparatus. More specifically, the present invention relates to an apparatus for crushing molten slag produced when wastes such as municipal garbage incineration ash and sewage sludge incineration ash are processed in a melting processing furnace.

[Prior art] Various types of waste such as municipal garbage, sewage sludge, and treated wastewater discharged from mines and factories are incinerated in incinerators, and the resulting incinerated ash has conventionally been disposed of by landfilling, etc. . However, as it has become difficult to secure land for landfills, and there is a risk that the harmful heavy metals contained in them may leach into the ground, contaminating the area around the landfill and causing secondary pollution, electric arc furnaces are A method has been proposed in which the material is melted and solidified using a direct current melting furnace or the like.

For example, a method described in JP-A-52-86976 is known as a method using a melting furnace using electric arc heating. According to this method, molten slag containing mainly inorganic components is produced by melting incineration ash. Furthermore, harmless metals (for example, iron) in the incineration ash settle to the bottom of the furnace as molten metal. If you take these out and solidify them,
The volume reduction rate is extremely large, which helps reduce the need for landfill sites.

Further, since harmful metals are incorporated into the molten slag and become insoluble in water, the problem of secondary pollution caused by landfilling is also solved. Furthermore, the solidified slag has the advantage that it can be reused as aggregate for civil engineering, and the solidified harmless metal can be reused as scrap.

[Problems to be Solved by the Invention] As the melting process progresses, the generated molten slag is gradually transferred from the outlet of the melting process furnace to a granulation tank filled with water. The molten slag is discharged, rapidly cooled, and granulated assimilated, but the molten slag is
It is maintained at a high temperature of 50 to 1550'C, and if it comes into contact with the outside air before reaching the granulation tank during discharge, the temperature will drop, and icicles will hang down from the discharge port, solidify, and melt. Situations may occur in which the slag may block the flow path of the slag, or it may adhere to and block the granulating nozzle provided outside the molten slag flow, thereby impeding subsequent discharge. Further, the amount of molten slag discharged and the thickness of the flow vary depending on the amount of incinerated ash processed, the input power, etc. Roughly speaking, as mentioned above, exposure to the outside air lowers the temperature and increases the viscosity, and the flow trajectory (flow line) of the molten slag flow irregularly meanders, so the center of the flow line also irregularly escapes and melts. Water jetted from the granulating nozzle with a circular opening provided on the outside of the slag flow will not reach the granulating water evenly, the granulating effect will not be sufficiently exerted, and abnormal lumps of slag may solidify while flowing down. Smooth discharge work may not be possible. Such a phenomenon is particularly likely to occur when the amount of molten slag discharged is small.

In this case, the assimilates are manually broken down and removed, but this involves crushing high-temperature materials and is extremely dangerous.

[Means for Solving the Problem] The inventors of the present invention have made various studies to solve the above-mentioned problem, and have achieved the following: A water jet is provided outside the molten slag flow so that the molten slag is always surrounded by a water film curtain and evenly sprayed with cooling water to crush the molten slag and prevent the formation of abnormal lumps of slag in the flow path. The injection opening of the nozzle has a specific shape, and the injection angle or the amount of water injection is controlled remotely so as to be variable in order to uniformly spray water in response to changes in the flow line of the molten slag flow, This enables safe and smooth continuous discharge.

That is, the present invention provides a water crushing device that is installed in a discharge path of molten slag formed in a waste melting processing furnace to cool and crush the molten slag by injecting water toward the flow of the molten slag being discharged. a nozzle that is equipped with a flat jet opening that jets water so as to surround the molten slag flow with a water film curtain, and whose jet angle can be adjusted in accordance with changes in the flow line of the molten slag flow; A waste product characterized by comprising: a continuous monitoring device that monitors changes in the flow line; and a control device that receives a signal from the monitoring device and instructs adjustment of the injection angle of the nozzle or adjustment of the amount of water injected. The gist is a molten slag water crushing device.

[Example 1] Hereinafter, the present invention will be explained based on an example shown in the drawings.

First, FIG. 1 is a schematic diagram of a submerged arc furnace, which is one type of arc heating furnace, and 1 contains one or more of carbon, magnesia, alumina, etc.! The furnace body is made of refractory material, and its upper surface is covered with a furnace lid 2. A plurality of electrodes 3 pass through the furnace lid 2, and an incineration ash inlet 4 and an exhaust gas duct 5 are provided.

This furnace is generally used for refining pig iron, metal alloy, copper, curved lead, tin, etc., and for manufacturing chemical products such as carbide, phosphorus, and soluble phosphorous fertilizer. It is a melting and processing furnace that melts and processes vehicles without generating a (submerged) arc between the material to be melted or the molten slag charged into the furnace.

The method of operating the furnace is to sequentially charge the incinerated ash a from the incinerated ash inlet 4 so that it has a uniform thickness and melt it. Through this process, two layers are formed from the incineration ash a: a molten metal mainly consisting of iron and a molten slag C consisting of one layer of inorganic components.The molten metal B is at the bottom of the furnace, and on top of that is the molten slag C1. Unmelted incineration ash a is layered on top of it.

The molten slag C generated in the mouth of the furnace body is 135
The high temperature of 0 to 1550'C is maintained, but as the volume of the molten slag increases due to continuous charging of incinerated ash a, it is sequentially discharged from the discharge port 30. 6 is an auxiliary inlet for a melting initiator to prevent solidification of the molten slag C at the discharge port 30; 7 is an auxiliary HD heating electrode for preventing assimilation; The discharge port 30 moves up and down on the passage.

This will be further explained with reference to FIG. 2, which is a partially enlarged view of FIG.

Reference numeral 12 denotes a frame that supports this, and an arm 14 that is threadedly engaged with the drive shaft 11 moves up and down on a shaft 13 that is fixed within the same frame 12 as the drive shaft 11 rotates. Therefore, assimilation can be prevented by moving the auxiliary IJ [1 thermal electrode 7 held at the tip of the arm 14 downward by one step depending on the degree of fluidity of the molten slag C in the discharge port 30 passage and heating it. .

15, the discharged molten slag C flows down vertically and water 1
This is a cover that keeps the water warm in the vertical flow passage until it is introduced into the granulation tank 17 filled with water. The temperature of the protective cover 15 is lowered when the molten slag C comes into contact with the outside air.
As expected, it has a function that prevents it from forming into icicles and solidifying inside the passageway.

The inside of the protective cover 15 is provided with a damper to prevent the vertical flow of the flowing molten slag C (if the amount of discharged slag is particularly small, the temperature will drop quickly upon contact with the outside air, the viscosity will increase, and the slag will meander and wobble in the vertical flow direction). A water crushing nozzle 18 is provided for injecting pressure cooling water to rapidly cool and crush C1.

25 is an optical pyrometer (remote monitoring thermometer) that emits a certain amount of light and measures the temperature of the flowing path of the flowing molten slag C while maintaining a corresponding temperature, and converts the continuously measured temperature into an electrical signal and transmits it. It is installed above the arrangement position of the water granulation nozzle 18. Reference numeral 26 is a control means which functions to receive the electric signal and issue an instruction to adjust the injection angle and the amount of water to be injected from the water pulverizing nozzle 1B. In addition, light high temperature training 2
In the fifties, television equipment consisting of a television camera and a television receiver can also be used.

The granulating nozzle 18 will be explained based on FIG. 3, which shows an enlarged plan view taken along line xx' in FIG. Rotating injection pipes 19b and 19c connected in a horseshoe shape
, 19d, and is provided outside the molten slag flow C so as to surround the vertical flow of the molten slag C.

As shown in the perspective view of FIG. 4, each of the injection pipes includes lip-shaped flat injection openings 20a, 20b for injecting cooling water;
20c and 20d, cooling water forms a film-like curtain and is injected from these openings from four directions to cool the molten slag C.
The molten slag C meandered in a biased direction during the flow and ran in a different direction, trying to escape from the collision of the jet water,
Alternatively, the material solidifies when it comes into contact with the outside air while flowing down, and when the flow path tries to grow and enlarge during the flow, it is reliably detected from four directions and cooled and crushed. Further, each injection pipe is provided with injection angle adjustment L/bars 21a, 21b, 21c, and 21d, which are connected to arms 22a, 22b, and 21d, respectively.
2c and 22d, it is rotated in the direction of the arrow by a step motor 23 (or a hydraulic cylinder). As a result, the injection openings 20a, 20b,
20c.

The opening direction of 20d is diagonally downward at 45° from the horizontal.
It is adjusted within the range of angle θ) formed in the direction of the arrow in the figure. The inventor of the present invention has determined that by adjusting the injection opening angle in this manner, the cooling injection water can more reliably catch the flow path of the molten slag C, and the slag can be efficiently performed. Next, a cooling water introduction pipe 27 connected to a water supply source via a solenoid valve 28 is cut into the cheese 20 connected to each injection pipe.

In the above-described fracking equipment, the outlet 5 of the melting furnace
When the molten slag C flowing down from the optical pyrometer 25 enters the sensing area of the optical pyrometer 25, its surface temperature is measured and transmitted as an electrical signal to the control means 26.

If the temperature value converted from the signal is below a pre-input value (if the flow path of the molten slag C comes into contact with the outside air and indicates a sign of cooling assimilation), the controller controls the water supply source. An opening command is issued to the electromagnetic valve 28 provided in the pipe connecting the cooling water introduction pipe 27, and water is injected from the injection opening of each injection pipe. The amount of water injected is adjusted by means such as increasing or decreasing the opening amount of the solenoid valve 28. Further, the control means 26 performs a detailed analysis of the electrical signal from the optical pyrometer 25 that senses the state of the molten slag flow, and adjusts the amount of water injected or the water injection opening angle θ for each electromagnetic valve 28 or each injection pipe. A command is issued to the step motor 23 (or hydraulic cylinder) to adjust and rotate each individual in a range from 0° in the horizontal direction to 45° diagonally downward. When a television equipment is used instead of the optical pyrometer 25, a person may generate the signal by looking at the television screen.

Through the control operations described above, the water jet direction can be individually changed depending on the shape of the molten slag flow in the downstream passage.
By increasing or decreasing the amount of cooling injection water, water is evenly injected into the flow path to prevent it from growing, enlarging, or meandering down, and continuously and smoothly crushing the water, and the crushed slag becomes underwater slag 26. The water then accumulates at the bottom of the water crushing tank 17.

The pressurized water jetted from the water pulverizing nozzle 18 is collected into the water pulverizing tank 17 together with the solidified slag that has been cooled and crushed.

[Function] The molten slag flow that is discharged from the melting furnace and flows down vertically is surrounded by a water film curtain, and at the same time, when the slag comes into contact with the outside air, its viscosity increases and the slag flows down in a meandering manner or becomes enlarged. The molten slag flow is continuously cooled, crushed, and solidified by cooling water by sensing the deviation of the water and adjusting the injection angle or amount of water injection from four directions.

[Experiment example] Municipal garbage incineration ash (moisture content 15%) was melted at a rate of approximately 1 ton/hr using a waste melting furnace with a capacity of 9.6 M'' as shown in Figures 1 and 2. However, about 7
Molten slag was produced at a rate of 0ONg/hr. When this material was discharged, an abnormal lump of slag with a maximum diameter of 450 φ and a length of 700 to 110,001 I1 was generated in the molten slag flow, and the injection nozzle shown in Figs. 5kg/CI at the inclination angle of the range of movement
As a result of injecting JX's pressurized water, the water was evenly injected in the downstream passage, and the molten slag flow could be continuously crushed to an appropriate particle size without causing meandering enlargement and assimilation.

[Effects] As described above, the present invention surrounds the molten slag flow with a water film curtain in the discharge path of the molten slag generated in the melting processing furnace, and detects changes in the flow line with a monitoring device. It is provided with a mechanism for adjusting the injection angle or amount of injection cooling water from the water fracking nozzle. As a result, the escape from the flow line is caught, the injected cooling water is reliably caught and collided with the molten slag flow, and quenched crushing is performed, whereby the molten slag in the flow path hangs down and solidifies. This eliminates nozzle blockage due to adhesion to the water granulation nozzle, eliminates the situation where slag is assimilated in a strange appearance, and also enables smooth continuous discharge, greatly contributing to safe operation. It is.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic side sectional view of a melting processing furnace, FIG. 2 is a schematic side sectional view showing an enlarged part of FIG. 1, and FIG. Fig. 4 is a perspective view of the nozzle, Fig. 5 is a plan view taken along the line X-X-
FIG. 1... Furnace body 2... Furnace lid 3... Electrode
4...Incineration ash input port 5...Discharge port
6... Auxiliary input lower... Auxiliary heating electrode 8.
...Lifting device 16...Water 17...Crushing tank 18...Crushing nozzle 19a-d...Injection pipe 2
0a-d...Injection openings 21a-d...Angle adjustment lever 23...Step motor

Claims (1)

[Scope of Claims] 1. Injecting water toward a flow of molten slag formed in a waste melting processing furnace into a discharge path,
A water fracturing device provided for cooling and fracturing is provided with a flat jetting opening for jetting water so as to surround the flowing path with a water film curtain, and the jetting angle is set at a flow line of the molten slag flow. A nozzle that can be adjusted according to changes, a continuous monitoring device that monitors changes in the flow line, and a control that instructs adjustment of the injection angle of the nozzle or adjustment of the amount of water injected in response to a signal from the monitoring device. An apparatus for crushing waste molten slag, comprising means. 2. The waste molten slag granulation apparatus according to claim 1, wherein the waste melting processing furnace is a municipal waste incineration ash melting processing furnace. 3. The waste molten slag water crushing apparatus according to claim 1, wherein the injection angle is adjusted by driving a hydraulic cylinder or a step motor. 4. The waste molten slag water crushing apparatus according to claim 1, wherein the continuous monitoring device is an optical pyrometer or a television equipment. 5 The injection angle is from 0° to 4 degrees diagonally downward from the horizontal direction.
Claim 1, which is adjustable within a range of 5°
A water crushing device for waste molten slag as described in Section 1.