JP2001011544A - Producing method and producing apparatus of sintered ore - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producing method of a sintered ore, by which coal having high volatile matter or waste synthetic resin materials, or the like, conventionally impossible to use as solid fuel, can be used in the case of producing the sintered ore, and a producing apparatus therefor. SOLUTION: When the sintered ore is produced by sintering pseudo grain composed of at least powdery ore, flux and solid fuel with a downward sucking type endless shifting sintering machine, plural wind boxes 18 are continuously arranged in the downward sucking type endless shifting sintering machine 200 and hydrocarbon component in exhaust gas in continuous wind boxes 18 containing a burn-rising point(BRP) and a burn-through point(BTP) decided from the waste gas temp. measured value in at least each wind box, is removed with removing devices 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a sintered ore for producing a sintered ore using an endless mobile sintering machine of a downward suction type.

[0002]

2. Description of the Related Art In the production of sinter, generally, a downward suction type endless moving type Dwyroid type sintering machine (hereinafter referred to as a sintering machine) is used. Usually, the production of sinter by a sintering machine is performed by adding fine ore as a sintering raw material, returning ore, a medium solvent, a solid fuel, and quicklime as a granulating binder, and an appropriate amount of water. The mixture is mixed and pre-granulated by a primary mixing granulator, and further granulated by a secondary granulator to form pseudo particles, and then the pseudo particles are filled on a pallet of a sintering machine to form a raw material layer. Then, after igniting the surface of the raw material layer to ignite the coke breeze, it is fired while sucking air downward.

[0003] As the above-mentioned solid fuel, coke breeze is generally used, and as an alternative to coke breeze, anthracite with low volatility is used. If other raw materials can be used, the range of choices for solid fuels is widened, which is preferable in operation. From such a viewpoint, a technique using rubber-based waste such as waste tires or styrene foam as a solid fuel has been proposed.

For example, Japanese Unexamined Patent Publication No. Hei 9-164378 discloses that, instead of coke breeze, crushed pieces of rubber waste are sprayed on the surface of a sintering material layer filled on a pallet, ignited and fired. It describes that by tying, the amount of reaction heat in the upper layer of the pallet is increased, thereby achieving both improvement in yield and rubber-based waste disposal.

Japanese Unexamined Patent Publication (Kokai) No. 59-166632 discloses that styrene foam of an appropriate size is subjected to one or both of a primary granulation step and a secondary granulation step of a sintering raw material.
0.1 to 1.0 wt% is added to and mixed with the sintering raw material, and the obtained sintering raw material is loaded on a sintering machine pallet, whereby the styrene foam pieces function as a rough filler, and the air permeability of the raw material layer is increased. It is described that the styrene foam mixed with the raw material layer burns with the progress of the sintering reaction and can be used as a substitute for solid fuel, in addition to improving the product yield and productivity.

[0006]

However, conventionally,
When a highly volatile fuel such as coal is used as a solid fuel, hydrocarbon-based gas is generated in the combustion process,
This generated gas is contained in the exhaust gas without burning,
It has been known that the dust adheres to the inside of an exhaust gas treatment facility such as an electric dust collector or the inner wall portion of a main exhaust gas duct to cause a trouble such as a fire of the electric dust collector or a blockage of a main exhaust gas duct. Therefore, there is a limitation that only anthracite that does not substantially contain coke breeze or volatile components can be used as the solid fuel.

Further, when rubber waste such as waste tires or styrofoam is used as a partial substitute for coke breeze as in the above-mentioned prior art, similarly to the case where coal is used, hydrocarbons are used in the combustion process. The main component gas is generated,
There arises a problem that a trouble such as a fire of the electric dust collector or a blockage of the main exhaust gas duct occurs.

In recent years, industrial waste waste plastics and general waste waste plastics (hereinafter collectively referred to as waste synthetic resin materials) have been used for reasons such as generation of dioxins and depletion of landfill sites. However, the conventionally performed incineration and landfill treatment are becoming difficult. Therefore,
If waste synthetic resin material can be used as a solid fuel in the production of sinter ore, the range of choice of solid fuel can be widened and it is convenient from the viewpoint of waste disposal. Also, a gas mainly containing hydrocarbons is generated in the combustion process, which may cause the same trouble.

As a countermeasure for such a trouble, removal of hydrocarbon components contained in the sintering exhaust gas can be considered.
For example, in a sintering machine having a firing area of 400 m ² class, the amount of exhaust gas reaches 700,000 to 1,000,000 m ³ per hour, so that the equipment for removing hydrocarbon components has to be large, which is not practical.

[0010] The present invention has been made in view of such circumstances, and uses coal or waste synthetic resin material having a high volatile content that could not be used as a solid fuel in the production of sinters. It is an object of the present invention to provide a method and an apparatus for producing a sintered ore that can be produced.

[0011]

Means for Solving the Problems As a result of repeated studies to solve the above-mentioned problems, the present inventors have found that when a substance having a high volatile content such as coal or synthetic resin material is used as a solid fuel, downward suction is performed. It has been found that the hydrocarbon concentration in the exhaust gas in each of the wind boxes provided continuously in the endless mobile sintering machine is not constant, but is high only in a specific range of the wind boxes.

That is, conventionally, when coal or waste synthetic resin material having a high volatile content is used as a solid fuel, volatile gas mainly containing hydrocarbons is produced from coal or waste synthetic resin material during the sintering reaction process. It was thought that the volatile gas was generated and flowed into the exhaust gas treatment system via the wind box without being burned.However, according to the detailed study of the present inventors, each of the sintering machines in the machine direction was considered. The hydrocarbon concentration in the exhaust gas in the wind box is not constant. In the wind box from the first wind box to the burn rising point (BRP), hydrocarbon components are hardly detected, but the burn rising point (BRP)
It was found that the concentration of hydrocarbons was high in the wind box between the burn-through point and the burn-through point (BTP).

The present invention has been completed on the basis of such findings, and comprises a sintering method in which at least pseudo particles composed of fine ore, a solvent medium, and a solid fuel are fired by a downward suction type endless moving sintering machine. In the ore production method, of a plurality of wind boxes continuously provided in a downward suction type endless moving sintering machine,
A sinter ore, characterized in that at least a burn rising point (BRP) and a burn-through point (BTP) determined from measured values of the exhaust gas temperature of each wind box are used to remove hydrocarbon components in the exhaust gas of the continuous wind box. A manufacturing method is provided.

The present invention is also directed to a sintered ore manufacturing apparatus for manufacturing a sintered ore by firing pseudo particles comprising at least a fine ore, a solvent medium and a solid fuel, wherein the pseudo particles are placed in a horizontal direction. Moving grate, an ignition furnace for igniting pseudo particles on the moving grate, a plurality of wind boxes continuously arranged below the moving grate along a traveling direction of the moving grate, and the plurality of wind boxes And a gas discharge mechanism that discharges exhaust gas through a burn-rising point (BRP) and a burn-through point (BTP) determined from at least exhaust gas temperature measurement values of each of the plurality of wind boxes. An apparatus for producing a sintered ore, comprising: a removing mechanism for removing a hydrocarbon component in exhaust gas from a wind box.

According to the above configuration, a substance having a high volatile content can be used as the solid fuel. Here, a substance having a high volatile content means that when added as a solid fuel, a gas containing hydrocarbon as a main component is generated in a combustion process, which may cause a trouble such as a fire of an electric dust collector or a blockage of a main exhaust gas duct. It refers to a substance, typically a fuel such as coal having a high volatile content, and a synthetic resin material such as waste plastic and waste tire. The volatile content of coal is
It is a volatile matter measured by industrial analysis of coal (JIS M 8812), and a coal having a high volatile matter is a coal having a volatile matter measured in this manner of about 10% or more. Incidentally, anthracite which has been conventionally used as a substitute for coke breeze has a volatile content of 10% or less.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. The method for producing a sintered ore according to the present invention includes a method of producing a sintered ore by firing at least pseudo particles composed of fine ore, a medium solvent, and a solid fuel in a downward suction type endless moving sintering machine. Among a plurality of wind boxes continuously provided in the endless mobile sintering machine, a burn rising point (B) determined from at least the exhaust gas temperature measurement value of each wind box.
(RP) and a burn-through point (BTP) to remove hydrocarbon components in exhaust gas of a continuous wind box. This makes it possible to use a substance with a high volatile content as the solid fuel, as will be described in detail later.

The highly volatile substances applied as solid fuel are used in admixture with coke breeze. As the substance having a high volatile content, a fuel such as coal having a high volatile content or a synthetic resin material can be used. When a coal having a high volatile content (that is, a volatile content of about 10% or more) is used as the solid fuel, the upper limit of the blending ratio in the solid fuel is 50 wt%.
This is because coal is less flammable than coke.
On the other hand, when a synthetic resin material such as a waste synthetic resin material is used, the upper limit of the mixing ratio in the solid fuel is 40 wt%. This is because combustion of the synthetic resin material requires a time of 3 minutes or more at a temperature of 1100 ° C. or more, and the compounding ratio of the synthetic resin material is 40
If the content exceeds wt%, a combustion zone described later expands and the maximum temperature of the combustion zone does not increase, and as a result, productivity decreases.

The highly volatile substance used as the solid fuel is preferably ground to a suitable particle size. When coal having a volatile content of about 10% or more is used, the particle size is almost the same as the conventionally used coke fine particle size, and the maximum particle size is desirably 5 mm and -125 μm is desirably 30% or less. On the other hand, it may not be technically easy to finely pulverize a synthetic resin material, and a particle size of 1 to 10 mm is easily available.

In the step of granulating the pseudo particles, the substance having a high volatile content added as a solid fuel is added at an appropriate position depending on the pseudo particles to be obtained. For example, when using coal as a substance with a high volatile content, if added at the entrance of the primary granulator, most of the coal will be embedded in pseudo particles,
In addition, if added at the entrance of the secondary granulator, the ratio of packaging to the pseudo particles increases. On the other hand, when a synthetic resin material is used, if it is added at the entrance of the primary granulator, most of it will be embedded in the pseudo-particles as in the case of coal, but if it is added at the entrance of the secondary granulator. However, since the synthetic resin material has a larger particle size than coal or coke breeze, most of the synthetic resin material is not packaged on the surface of the pseudo-particles but becomes a mixture with the pseudo-particles.

Coal and synthetic resin materials used as solid substances as highly volatile substances may be used alone or in combination. Since the synthetic resin material is used as a part of the solid fuel, the synthetic resin material is not limited to the waste synthetic resin material, but may be a general synthetic resin material.

Next, equipment for implementing the present invention will be described. FIG. 1 is a schematic configuration diagram showing an example of equipment for carrying out the method of the present invention. This equipment includes a pseudo particle manufacturing equipment 100 and a downward suction type endless moving sintering machine 200.

The quasi-particle manufacturing equipment 100 includes a hopper 1 for storing a sintering raw material, a hopper 2 for storing returned ore, a hopper 3 for storing a solvent medium, and a hopper 4 for storing a granulated binder (quick lime). A hopper 5 for storing coke breeze as a solid fuel; a hopper 6 for storing coal (volatile content of 10% or more) as a solid fuel; a primary mixer 8 and a secondary mixer 9.

Then, from the hoppers 1 to 5, sintering raw materials,
A predetermined amount of returned ore, a solvent medium, a granulated binder, and coke breeze as a solid fuel is cut out, an appropriate amount of water is added thereto, and the mixture is mixed and pre-granulated by the primary mixer 8.
Next, the pre-granulated material is charged into the next mixer 9, and the rest of coke breeze and coal are added from the hoppers 5 and 6, and further granulated to produce pseudo particles. At this time, the ratio of coke breeze and coal in the solid fuel is appropriately set according to the following procedure.

The downward suction type endless mobile sintering machine 200 has an endless mobile type moving grate 15, on which the bedding ore is supplied from a bedding ore hopper 11. The pseudo particles are supplied by a roll feeder 13 via a surge hopper 12.

The moving path of the moving grate 15 includes the ignition furnace 1
The sintering is started when the pseudo particles on the moving grate 15 pass through the ignition furnace 14 to start sintering, and a sintering bed 16 is formed. At the outlet side of the moving grate 15, a crusher 17 is provided. The crusher 17 crushes the sinter dropped from the moving grate 15 and supplies the crushed ore to a conveyor (not shown).

A plurality of wind boxes 18 are arranged directly below the moving grate 15 along the traveling direction of the moving grate 15, and a vertical duct 19 is connected to each wind box 18. These vertical ducts 19 are connected to a horizontally arranged main exhaust gas duct 20, and the exhaust gas is
It is to be discharged through. The exhaust gas is discharged from the main exhaust gas duct 20 by the main blower 25, the electric dust collector 24, the desulfurization tower 26, and the chimney 27.

Of the above-mentioned wind boxes 18, a wind box 18 corresponding to BRP, which will be described later, and a wind box 18 corresponding to _BRP and BTP.
Multiple wind boxes 18 including _BTP (three in the figure)
A vertical duct 19 provided with a removing device 21 for removing a hydrocarbon component is provided. An annular pipe having a plurality of nozzles (not shown) is provided in the removing device, and the exhaust gas passing through the vertical duct 19 is sprayed with washing water from the nozzles to remove hydrocarbons. Has become. That is, partial treatment of the sintering exhaust gas is performed. The waste water after washing generated at that time is sent from the steam separator 22 to the coke plant via the pipe 40, where it is combined with the low-temperature water and treated.

Next, another example of a facility for producing a sintered ore from a raw material via pseudo particles will be described with reference to FIG. This equipment includes a pseudo-particle manufacturing equipment 100 'and a downward suction type endless moving sintering machine 200'. The simulated particle production facility 100 ′ is provided with a hopper 7 for storing waste plastic instead of the hopper 6 in the simulated particle production facility 100, and waste plastic is used as solid fuel from the hopper 7 in the primary mixer 8 and the secondary mixer 9. Only the point of supply to both is different from the pseudo particle production facility 100.

A downward suction type endless moving type sintering machine 20
0 ′ is a vertical duct 1 continuous with a plurality of wind boxes 18 including the wind box 18 _BRP and the wind box 18 _BTP of FIG.
9 is replaced with a sub exhaust gas duct 30 for collecting exhaust gas from these wind boxes and an exhaust gas circulation hood 32 provided on the sintering bed 16 only in the point of being provided with a downward suction type. It is different from the endless mobile sintering machine 200. That is, in the downward suction type endless mobile sintering machine 200 ', is a set of a plurality of wind boxes 18 consecutive include wind box 18 _BRP and windbox 18 _{B TP} exhaust gas to Fukuhai gas duct 30, which exhaust gas circulation It returns to the exhaust gas circulation hood 32 via the duct 31. Thereby, the circulating exhaust gas is sucked into the sintering bed below the exhaust gas circulating hood 32, and the hydrocarbon components in the circulating exhaust gas are completely burned in the high-temperature sintering zone. The exhaust gas circulating hood 32 is
It is necessary to provide in a range where the sintering zone exists on the downstream side of 4.

Next, the partial treatment of the sintering exhaust gas will be described in detail. FIG. 3 is a cross-sectional view showing a sintering raw material layer on a moving grate of a sintering machine, and is a view showing a process in which a sintering reaction proceeds. FIG. 4 shows A of the sintering raw material layer of FIG.
It is a figure which shows the -A 'cross section. 3 and 4, the sintering completion layer 51 is a region where the sintering reaction is completed by ending the combustion of the solid fuel inside or outside the pseudo particles. The internal temperature of the sintering completion layer 51 is 100 ° C to 500 ° C.
The sintering zone 52 is an area where the solid fuel is burning intensely.
The temperature in the layer is highest at 1250 ° C. to 1350 ° C., and is a region where solid-liquid coexistence occurs where a mineral synthesis reaction occurs. The drying zone 53 is a region formed immediately below the sintering zone 52, and the moisture content is as low as 2 to 3 wt% because the moisture evaporates due to the sensible heat of the sintering zone 52. The temperature in the layer of the drying zone 53 is 100 ° C to 200 ° C. The wet zone 54 is an area formed below the dry zone 53,
Here, since the water added in the process of producing the pseudo particles is concentrated, the water content is as high as 7 to 15 wt%, and the air permeability is the lowest. The temperature of the wet zone 54 is usually 80 ° C. to 90 ° C.
° C.

FIG. 5 shows a measurement example of the exhaust gas temperature in each wind box of the sintering machine. In this measurement example, the wind box is No. in the machine length direction of the sintering machine from the ignition furnace side to the mining section. 1 to 24
Up to 24 are installed. In FIG. 5, Nos. 1 to 21
The exhaust gas temperature of the wind box is about 40 to 50 ° C.
The exhaust gas temperature after the 22nd wind box rises rapidly and becomes constant at about 400 ° C. In FIG. 5, the point at which the temperature of the exhaust gas suddenly starts rising is represented by a burn rising point (BRP).
The point at which the exhaust gas temperature rises to a maximum value is called a burn-through point (BTP).

Generally, the temperature of the exhaust gas is low while the wet zone 54 remains on the grate, and when the wet zone 54 disappears and the dry zone 53 and the sintered zone 52 reach the lower part of the raw material layer, the exhaust gas temperature rises sharply. I do. When only the sintering completed layer 51 is provided on the grate, the exhaust gas temperature becomes constant after showing the highest value.
Therefore, the wet zone 54 exists up to the BRP, and the BRP
Between BTP and BTP, the wet zone 54 disappears, the drying and sintering reaction proceed, and the sintering reaction is completed with BTP.

Conventionally, a substance having a high volatile content (10% volatile content)
When the above coal or waste synthetic resin material) is used as a solid fuel, volatile gas mainly composed of hydrocarbons is generated from the coal or waste synthetic resin material during the sintering reaction process, and this volatile gas is burned. Instead, it was thought that the gas flowed into the exhaust gas treatment system via the wind box. However, according to detailed studies by the present inventors, the hydrocarbon concentration in the exhaust gas in each wind box in the machine direction of the sintering machine was determined. Was not constant and was found to be high only in certain wind boxes. That is, No. Hydrocarbon components are hardly detected in wind boxes from 1 wind box to BRP,
It was found that the concentration of hydrocarbons was high in the wind box between BRP and BTP.

This corresponds to No. From 1 to BRP, volatile hydrocarbon components are trapped in the low-temperature wet zone just below the combustion zone, so they are hardly detected in the exhaust gas from the wind box, but the wet zone disappears in the range between BRP and BTP. Therefore, it is considered that the hydrocarbon components reach the wind box together with the exhaust gas without being trapped in the wet zone. The reason why the hydrocarbon component is not detected in the wind box after the BTP is that the solid fuel is completely burned before the BTP.

Therefore, when removing the hydrocarbon component in the exhaust gas, it is sufficient to remove the hydrocarbon component only from the exhaust gas from the wind box between BRP and BTP. That is, the amount of the sintering exhaust gas from which the hydrocarbon component is to be removed can be reduced to about 1/10 to 1/6 of the case where the entire amount is treated, and tar adhesion to the inside of the exhaust gas treatment device can be relatively easily prevented. can do. For this reason, a large-sized hydrocarbon component removal facility is unnecessary, and as described above, a substance having a high volatile content, which has not been conventionally used as a solid fuel, such as a fuel such as coal or a synthetic resin material is used as a fuel. Becomes possible. In actual operation, BRP and BTP
Moves slightly back and forth depending on the operating conditions, so it is more preferable to provide extra wind boxes before and after each of them to remove hydrocarbon components in the exhaust gas.

As described above, in order to remove only the hydrocarbon component in the exhaust gas from the wind box between BRP and BTP, the exhaust gas is directed into the vertical duct 19 below the wind box 18 as shown in FIG. It is effective to provide a removing device 21 for spraying water from a plurality of nozzles in a spray form to wash the exhaust gas.
In this case, since the wastewater after washing contains tar components, the same wastewater treatment as that of the low-temperature water generated from the coke oven may be performed. That is, as described above, the wastewater after washing is sent from the steam separator 22 to the coke plant via the pipe 40,
Therefore, the treatment may be performed by combining with the low-temperature water generated from the coke oven.

The exhaust gas from which the hydrocarbon components have been removed by the above-described method is combined with the exhaust gas of another wind box in the main exhaust gas duct 20 and discharged to the atmosphere from the chimney 27 via the electric dust collector 24. As shown, if necessary, a desulfurization treatment tower 26 may be provided to perform desulfurization treatment and discharge the air from the chimney 27 to the atmosphere. May be discharged.

As a method for removing hydrocarbon components in the exhaust gas, in addition to the washing method using water spray shown in FIG. 1, as shown in FIG. 2, the auxiliary exhaust gas duct 30, the exhaust gas circulation duct 31, and the exhaust gas circulation Hood 32 is provided and B
It is also effective to circulate the exhaust gas from the wind box 18 between the RP and the BTP to the downstream side of the ignition furnace 14, suck the exhaust gas into the sintering bed, and completely burn in the high-temperature combustion zone. In this case, if the exhaust gas circulation duct 31 is kept warm, the sensible heat of the exhaust gas can be recovered. In addition, it is also possible to adopt a method of circulating the exhaust gas of the wind box between BRP and BTP to the ignition furnace and burning it as secondary air in the ignition furnace. In the case of a method of circulating exhaust gas downstream of the ignition furnace or to the ignition furnace, wastewater treatment is not required.

[0039]

Embodiments of the present invention will be described below. (Example 1) In this example, sintered ore was manufactured using the equipment shown in FIG. Table 1 shows the composition and particle size of the used sintering raw material, the particle size of coke breeze and coal used as a part of the solid fuel, and the industrial analysis value of coal.

First, a predetermined amount of sintering raw material, returned ore, a solvent medium, a granulated binder (quick lime), and coke breeze as a solid fuel are cut out from hoppers 1 to 5, respectively, and an appropriate amount of water is added thereto. The pre-granulated material is mixed and pre-granulated in the primary mixer 8, and then the pre-granulated material is charged into the secondary mixer 9, and the remaining coke breeze and coal are added from the hoppers 5 and 6, and further granulated. , Pseudo particles.
That is, part of the coke breeze is added to the primary mixer and the rest is added to the secondary mixer, while the total amount of coal is 2 parts.
Next, it was added with a mixer. Here, the ratio of coke breeze to coal in the solid fuel was 50:50. The obtained pseudo particles pass through a surge hopper 12 and are supplied to a roll feeder 13.
Was charged on the moving grate 15 of the sintering machine 10 and sintering was performed in accordance with normal sintering operation conditions.

A total of 24 wind boxes 18 are arranged.
No. corresponding to BRP. No. 21 corresponding to BTP from wind box No. 21 The exhaust gas of three consecutive wind boxes up to 23 wind boxes is
The cleaning device 21 provided in the vertical duct 19 of each wind box 18 sprayed washing water from a nozzle onto exhaust gas passing through the duct to remove hydrocarbon components. The waste water after washing generated at that time was sent from the steam separator 22 to the coke plant via the pipe 40, and was combined with the low-temperature water for treatment.

Further, the exhaust gas after washing is combined with the exhaust gas of another wind box from the steam separator 22 through the duct 23, subjected to the desulfurization treatment in the desulfurization treatment tower 26 through the electric dust collector 24, and then discharged from the chimney 27. did.

The oil content in the dust of the electric precipitator 24 was measured by an acetone extraction method in order to examine whether or not the hydrocarbon component adhered to the exhaust gas treatment system.

As a result, even if the electric dust collector 2 is operated for a long time,
The oil content in dust of No. 4 was 1 wt% or less, and there was almost no difference from the case where only coke breeze was used as the solid fuel,
It was confirmed that even when coal was used up to 50 wt% of the solid fuel, no tar adhered to the inside of the exhaust gas treatment device.

The quality of the obtained sinter, for example, reducibility, reduction pulverizability, rotational strength, etc., was comparable to the case where only coke breeze was used as the solid fuel.

Example 2 In this example, coke breeze and waste synthetic resin material were used as solid fuels, and sintered ore was produced using the equipment shown in FIG. That is, instead of the hopper 6 of FIG. 1, a hopper 7 storing waste synthetic resin material is used,
Further, as a method of removing hydrocarbon components in the exhaust gas, the exhaust gas of the wind box between BRP and BTP was circulated to the downstream side of the ignition furnace using the auxiliary exhaust gas duct 30, the exhaust gas circulation duct 31, and the exhaust gas circulation hood 32. .

Table 1 shows the sintering raw materials and coke breeze used.
The composition and the particle size were the same as those shown in FIG. The used synthetic resin material used is industrial waste waste plastic crushed to a particle size of 1 to 5 mm and an average particle size of 3 mm, and the ratio of the waste synthetic resin material and coke breeze in the solid fuel is used. Was 40:60.

As for the addition of the solid fuel, coke breeze was dividedly added to the primary mixer and the secondary mixer in the same manner as in Example 1, and 50% of the waste synthetic resin material was also added to the primary mixer. The remaining 50% was added in portions to the secondary mixer. Other mixing / granulation conditions and sintering operation conditions were the same as in Example 1.

In addition, No. corresponding to BRP No. 21 corresponding to BTP from wind box No. 21 The exhaust gas from the three wind boxes up to the 23 wind boxes was collected in the auxiliary exhaust gas duct 30, and then returned to the exhaust gas circulating hood 32 provided on the sintering bed by the exhaust gas circulating duct 31.

The circulating exhaust gas was sucked into the sintering bed below the circulating hood 32, and the hydrocarbon components in the circulating exhaust gas were completely burned in the high-temperature sintering zone. In this case, the exhaust gas circulation hood 32 needs to be provided in a range where the sintering zone exists downstream of the ignition furnace 14.

As in the case of Example 1, the oil content in the dust of the electrostatic precipitator was measured by the acetone extraction method in order to check whether or not hydrocarbon components adhered to the exhaust gas treatment system. The oil content in the dust of the dust collector is 1 wt% or less, and there is almost no difference from the case where only coke powder is used as the solid fuel. Even when the waste synthetic resin material is used up to 40 wt% of the solid fuel, it enters the exhaust gas treatment device. It was confirmed that no tar adhesion occurred.

Also, in Example 2, the quality of the obtained sintered ore, for example, reducibility, reduced pulverizability, rotational strength, etc., was equivalent to that when only coke breeze was used as the solid fuel. Was.

As another embodiment, a method of connecting the exhaust gas circulation duct 31 to the secondary air pipe of the ignition furnace 14 and burning and removing hydrocarbon components in the ignition furnace was also carried out. The effect was obtained.

[0054]

[Table 1]

[0055]

As described above, according to the present invention,
Hydrocarbons in the exhaust gas of a continuous wind box including at least BRP and BTP determined from the exhaust gas temperature measurement value of each of the plurality of wind boxes continuously provided in the downward suction type endless mobile sintering machine Since the components are removed, the amount of the sintering exhaust gas from which the hydrocarbon components should be removed is reduced by about 1 /
It can be reduced to about 10 to 1/6, and tar adhesion to the inside of the exhaust gas treatment device can be relatively easily prevented. Therefore, a large-sized hydrocarbon component removal facility is not required, and a substance having a high volatile content, such as a fuel such as coal or a synthetic resin material, which could not be conventionally used as a solid fuel, can be used as a fuel.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of equipment for performing a method of the present invention.

FIG. 2 is a schematic configuration diagram showing another example of equipment for carrying out the method of the present invention.

FIG. 3 is a cross-sectional view showing a sintering raw material layer on a moving grate for explaining the progress of a sintering reaction.

FIG. 4 is a cross-sectional view taken along the line AA ′ of FIG. 3, showing a sintering raw material layer on a moving grate, for explaining the progress of the sintering reaction.

FIG. 5 is a view showing an example of a measurement result of exhaust gas temperature in each wind box of the sintering machine.

[Explanation of symbols]

 14; ignition furnace 15; moving grate 16; sintering bed 18; wind box 20; main exhaust gas duct 21; removal device 30; auxiliary exhaust gas duct 31; exhaust gas circulation duct 32; exhaust gas circulation hood BRP; burn rising point BTP; point

Claims (2)

[Claims] 1. A method for producing a sintered ore in which pseudo particles comprising at least fine ore, a solvent medium and a solid fuel are fired by a downward suction type endless moving type sintering machine, comprising: a downward suction type endless moving type sintering. Among a plurality of wind boxes provided continuously in the machine, the exhaust gas of a continuous wind box including a burn rising point (BRP) and a burn-through point (BTP) determined from at least measured values of the exhaust gas temperature of each wind box. A method for producing a sintered ore, comprising removing a hydrocarbon component. 2. A sinter ore manufacturing apparatus for manufacturing a sinter by firing at least pseudo particles comprising fine ore, a medium solvent, and a solid fuel, wherein the pseudo particles are placed and moved in a horizontal direction. Great, an ignition furnace that ignites the pseudo particles on the moving great, a plurality of wind boxes continuously arranged below the moving great along the traveling direction of the moving great, and an exhaust gas through the plurality of wind boxes. A gas discharge mechanism that discharges air; and a burn rising point (BRP) determined from at least measured exhaust gas temperature of each of the plurality of wind boxes.
And a burn-through point (BTP) for removing hydrocarbon components in exhaust gas from a continuous wind box.