JP2002371307A - Method for recycling organic or hydrocarbon waste, and blast furnace facility suitable for recycling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology of treating organic waste and using the combustible gas in a blast furnace. SOLUTION: This recycling method is characterized by melting and gasifying the waste 4 in a vertical furnace, and blowing the generated combustible gas into the blast furnace. The recycling method is also characterized by charging the waste 4, a solid fuel such as cokes grains 6, and a solvent such as limestone grains 7 in the vertical furnace, in order to melt and gasify them, and blowing oxygen 10 and steam 11 into the furnace. The combustible gas is adjusted so as to have a composition with a calorific value of 2,000 kcal/Nm<3> or more. The employed vertical furnace comprises sequentially from above to below, a gas reforming zone, a pre-heating and thermal cracking zone, a moving layer of carbide, a melting and gasifying zone, and a molten material separating zone and the pool, as reaction or function zones. The combustible gas is blown from one or more of a tuyere 9 installed at the tip of the hot-blast air duct in the blast furnace, a tuyere for gas blowing installed in a bosh part, and a tuyere for gas blowing installed in a shaft part. The blast furnace facility 3 has the above vertical gasifying/melting furnace 1 as an auxiliary facility, for the operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the recycling of organic or hydrocarbon waste, in which the waste is melted and gasified in a gasification and melting furnace, and the gas produced is blown into a blast furnace. Related to recycling technology.

[0002]

2. Description of the Related Art General waste and industrial waste contain various properties. Among them, waste collected as garbage is processed by the following process, for example. Incineration, gasification, or melting treatment is performed in a vertical furnace or a garbage incinerator such as a rotary kiln, and the combustion heat generated there is recovered by sensible heat from the waste gas, or the combustible gas generated is secondarily burned for energy. The residue generated by melting and cooling, for example, after removing harmful substances, after appropriate solid treatment, and then used for construction materials and roadbed materials, etc. Only a small amount is landfilled.

As described above, efforts have been made to recycle waste as effectively as possible and to reduce the amount of waste finally disposed of, such as landfill.

For example, Japanese Patent Application Laid-Open No. 11-201427 discloses that combustible waste is gasified in a high-temperature gasifier, the generated gas is dust-removed and desalted, and then burned in a boiler having a heat storage burner, and steam is removed. There has been proposed a technology for generating and recovering energy with higher efficiency than before (hereinafter referred to as “prior art 1”). As described above, the prior art 1 is a technique for treating waste by a so-called thermal recycling process.

[0005] JP-A-9-235559 discloses that waste is heated in a rotary kiln-type pyrolysis reaction vessel.
The pyrolysis coke and pyrolysis gas generated therefrom are charged or blown into a blast furnace to process a large amount of waste and to reduce the operation cost in the blast furnace (hereinafter referred to as “prior art 2”). ") Has been proposed.

[0006] In the prior art 2, as the reaction operation in the waste pyrolysis reaction vessel, only the condition of shutting off air and the condition of heating temperature are specified. For this reason, the focus has been on pyrolysis coke as a product generated by processing waste. Therefore, no proposal has been made regarding the composition of the pyrolysis gas of the waste, the calorific value, and the like, and the effect of reducing the amount of coke used in the blast furnace due to the injection of the gas cannot be expected.

[0007] JP-A-2000-130947 also discloses that
A facility in which a waste treatment furnace and a blast furnace are combined in series has been proposed. Here, a process (hereinafter referred to as “prior art 3”) in which waste is heated by a horizontal carbonization device (see the same publication, FIG. 1) and the obtained carbide and gas are supplied to a blast furnace has been proposed. The effect of reducing the amount of coke used in the blast furnace is described. In Prior Art 3, it is possible to treat both organic waste and inorganic waste as treated waste (see the specification of the same publication, paragraph 0011). Is a desirable process, and therefore, there is little disclosure on the control of gas generated from a carbonization unit as a processing furnace during waste treatment and its utilization. Regarding the effect of charging or blowing into the blast furnace, even if the combined effect of both carbide and gas is evaluated, the intended effect is exhibited only when the inner volume of the blast furnace is about 10 m ^3. (Hot metal production: about 8 t / day), and the internal volume is 10 from the technical and economical viewpoints.
It is limited to blast furnaces of 0 m ³ or less.
15, see Table 1, paragraph 0011). Therefore, prior art 3
Technology of a normal commercial scale blast furnace, e.g.
0 to 4000 m ³ (hot metal production: about 5000 to 10
(Approximately 000 t / day).

[0008]

DISCLOSURE OF THE INVENTION The present inventors set an object as wide as possible in industrial waste and general waste and treat it in a large and efficient manner.
Reduce the amount of coke used in the blast furnace operation and contribute to environmental conservation through proper waste treatment.In addition, waste is effectively recycled as part of measures to deplete coking coal resources in steelmaking coke. An object of the present invention is to develop a technology that can contribute to cost reduction.

In order to achieve the above object, the above-mentioned prior arts 1 to 3 do not solve the following problems. That is, according to Prior Art 1, energy is recovered into high-temperature, high-pressure steam while absorbing the fluctuations in the amount and composition of flammable gas generated in waste treatment and suppressing the generation of harmful substances such as dioxin. According to Prior Art 1, by injecting the flammable gas into a blast furnace, a series of a high-temperature gasification furnace and a blast furnace can be used. It is difficult to recycle waste combined with the above. Also,
According to the prior arts 2 and 3, it is possible to recycle waste by combining a high-temperature gasifier and a blast furnace in series, but as described above, in the prior art 2, the flammable gas generated by the waste treatment is converted into a blast furnace. Even if it is blown into the furnace, it cannot be expected that the hot metal production cost will be reduced. Also,
In the prior art 3, this cannot be applied to a normal practical blast furnace.

Therefore, the present inventors have developed a technology for generating a combustible gas having appropriate properties which can contribute to a reduction in the amount of coke used in a normal commercial blast furnace. In order to recycle waste, it is conducted in waste treatment in a gasification and melting furnace, and is also operated in an integrated process in which combustible gas obtained in the waste treatment in the gasification and melting furnace is blown into a blast furnace. Making the conditions appropriate is set as a problem to be solved in the present invention.

The present invention solves the above-mentioned problems by treating a wide range of industrial waste and general waste in a gasification / melting furnace while suppressing generation of harmful substances. An object of the present invention is to provide a waste recycling technology that can reduce the amount of coke used in a stable blast furnace operation by injecting the generated combustible gas into a blast furnace and can contribute to environmental conservation.

[0012]

Means for Solving the Problems The inventor of the present invention has conducted intensive tests and examinations to solve the above-mentioned problems and achieve the goals.
The following ideas and findings were obtained.

First, the main types of treated waste are those mainly containing at least organic waste and / or hydrocarbon waste in order to widely treat the collected waste. As a result, the obtained combustible gas is blown into a blast furnace, and even when the composition ratio of organic and / or inorganic waste is small, generally a low calorific gas generated in that case is temporarily removed from the blast furnace. Supply to energy-necessary equipment, the range of types of waste to be treated can be expanded, and large-scale treatment of waste can be achieved, and efficient and stable operation of gasification and melting furnaces can be achieved. I focused on what could be possible.

As a waste treatment reactor for treating a wide range of waste species as described above, a waste preheating function, a thermal decomposition (including gas decomposition) function, a carbonization function, and a carbonization function are produced. Combustible gas generation function by combustion of carbide (hereinafter referred to as “carbonization and gasification function”), gas reforming function, melting and slagging function of high melting point material, and separation function of molten metal and molten slag With the development of a high-temperature atmosphere reactor and its furnace operation technology capable of exhibiting functions, it has been expected that the above-mentioned object of the present invention can be achieved. However, depending on the type of waste, for example, it is not necessary to fluidize the waste. However, a reactor that is actually installed is desirably a reactor that can exhibit all of the above functions in order to be able to handle various types of waste treatment.

[0015] Such a reactor is a vertical reactor of a fluidized bed type, which is a high-temperature reactor having a freeboard portion of an appropriate height range on the upper side of the reactor, and a high-concentration oxygen gas and It is desirable that a device for blowing high-temperature steam into the furnace be provided.

[0016] Organic and / or hydrocarbon-based waste is charged into the above-mentioned high-temperature gasification and melting furnace in a predetermined form (shape, size, moisture, etc.), and coke as a solid fuel and melt production are prepared. Limestone as a slag material is charged, while a gas for forming a fluidized bed is blown from the peripheral wall on the lower side of the furnace, while a suitable oxygen gas-containing gas and steam are blown, and the inside of the furnace is brought to a suitable high temperature state. It has been found that the intended purpose can be achieved by adjusting and blowing the combustible gas thus generated in the gasification / melting furnace together with hot air from the blowing tuyere of the blast furnace. At this time, charging of waste into the gasification / melting furnace and blowing of oxygen gas and steam are performed so that the calorific value of the combustible gas generated in the gasification / melting furnace becomes 2000 kcal / Nm ³ or more. It was found that the effect of reducing the amount of coke used in the blast furnace operation was further enhanced by adjusting the incorporation conditions.

The present invention has been made based on the above idea and knowledge, and the gist is as follows.

The method for recycling organic or hydrocarbon waste according to the first aspect of the present invention uses a vertical furnace to melt and discharge organic or hydrocarbon waste containing waste. It is characterized in that it is gasified and the combustible gas thus generated is blown into the blast furnace.

According to a second aspect of the present invention, there is provided a method for recycling organic or hydrocarbon waste, comprising: a waste, solid fuel and medium containing organic or hydrocarbon waste in a vertical furnace. A solvent is charged, and an oxygen gas-containing gas and steam are blown into the vertical furnace to generate a combustible gas in the vertical furnace, and the generated combustible gas is blown into the furnace of the blast furnace. It is characterized by the following.

According to a third aspect of the present invention, there is provided the method for recycling organic or hydrocarbon waste according to the first or second aspect of the present invention, wherein the waste is gasified by the vertical furnace to produce flammable waste. It is characterized in that the reactive gas is adjusted to a component composition having a calorific value of 2000 kcal / Nm ³ or more.

According to a fourth aspect of the present invention, there is provided a method for recycling organic or hydrocarbon-based waste according to any one of the first to third aspects of the present invention, wherein the vertical furnace is used for the reaction and function in the furnace. As a zone, a furnace in which a gas reforming zone, a preheating and pyrolysis zone, a carbide moving bed, a melting and gasification zone, and a melt separation zone and a pool portion are formed in order from top to bottom is used. In particular, it has features.

According to a fifth aspect of the present invention, there is provided a method of recycling organic or hydrocarbon-based waste according to any one of the first to fourth aspects, wherein the flammable gas is introduced into the blast furnace. Conventionally, the tuyere provided at the tip of the hot air blower tube, the tuyere is provided at the bosh section for gas injection, and the tuyere provided at the bosh section and the gas blown at the shaft It is characterized in that a tuyere is provided and the operation is performed from any one or more of the three tuyeres provided on the shaft portion.

A blast furnace facility suitable for recycling organic or hydrocarbon waste according to the invention according to claim 6 comprises a freeboard section, a fluidized bed, and a carbide moving bed in the furnace in order from top to bottom. A vertical gasification / melting furnace in which a high-temperature combustion / melting zone, and a melt separation zone and a pool are formed, and an incident of injecting combustible gas generated in the vertical gasification / melting furnace into the furnace. And a blast furnace body equipped with equipment.

[0024]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram illustrating an example of blast furnace equipment including a gasification / melting furnace and the like, which is used when the method for recycling organic or hydrocarbon waste according to the present invention is performed. As shown in the figure, the main components of this blast furnace facility are:
Vertical gasification / melting furnace 1, gas cleaning device 2, blast furnace 3,
And various devices attached to each of them. The gas purifying device 2 is not necessarily installed in consideration of a case where the combustible gas generated in the gasification / melting furnace 1 has good cleanliness or a case where the combustible gas is to be recycled in a high-temperature gas state. Alternatively or alternatively, the combustible gas may be bypassed by installing the bypass 2a of the gas cleaning device, and may not be used.

The main raw material for the gasification / melting furnace 1 is the waste that has been separated and processed at an intermediate treatment plant (not shown), among those recovered as industrial waste or general waste. Waste pit 4 attached to the gasification and melting furnace 1
a, 4b, 4c,... Each of the waste types of the waste pits 4a, 4b, 4c,... Includes an organic waste or a hydrocarbon waste.
The organic or hydrocarbon wastes include, for example, used plastics, car shredders, household wastes reduced in volume and solidified, construction mixed wastes, wood chips and waste paper, etc. It is stored in. When storing each type of waste, information on the calorific value of each type of waste is managed together with the weight received.

The wastes 4 are charged into the vertical gasification / melting furnace 1 from the furnace top using the waste charging device 5. Further, coke particles 6 as a solid fuel and limestone particles 7 as a slag-making agent are charged from the furnace top using a quantitative supply device 8. A tuyere 9 as a gas blowing mechanism is provided on the peripheral wall on the lower side of the gasification / melting furnace 1. The tuyeres 9 are provided in three stages, and the main tuyeres 9a,
The tuyere comprises a sub tuyere 9b and an upper tuyere 9c, and each of these tuyeres comprises a plurality of tuyeres. Oxygen gas 10 and steam 11 are blown from the tuyere 9. In addition, hot air 1
Also inject 2.

The waste 4 charged from the furnace top is mainly due to the action of these gases blown from the tuyere 9.
A fluidized bed 13 is formed in an intermediate height region in the furnace, where it is preheated and decomposed into gas as it is thermally decomposed. On the other hand, the coke particles 6 charged from the furnace top descend mainly to the high-temperature combustion / melting zone 15 including the raceway 14 formed in front of the main tuyere 9a in the furnace, where they burn violently. The internal temperature of the raceway 14 is 2000-2200
° C, and the high temperature gas containing CO generated by the combustion of the coke particles 6 in the high temperature combustion / melting zone 15 rises in the furnace. Thus, the heat of combustion of the coke particles 6 becomes the main heat source of the gasification and melting furnace 1. A part of the waste 4 also burns in the furnace and becomes a heat source.

In response to the furnace operation and the reaction state in the furnace, the reaction state in the gasification / melting furnace 1 is as follows.

First, as shown schematically in FIG. 2, the in-furnace region includes a free board section 16 and a fluidized bed 1 in order from the top.
3. The zone can be divided into a carbide transfer layer 17, a high-temperature combustion / melting zone 15, and a zone of a melt separation zone and a basin 18. The main reactions and functions in each zone are as follows.

In the freeboard section 13, the combustible gas containing various components rising from below is reformed (gas reforming zone). That is, about 800 to 1300
In a high-temperature atmosphere of about ℃, the gas of multi-bond molecules and long-chain molecules contained in the gas generated by the thermal decomposition of organic substances and hydrocarbon substances in the waste 4 is converted into monomolecules. Or reformed into a small molecular weight hydrocarbon-based gas to produce, for example, methane and ethane.

In the fluidized bed 13, the waste 4 is preheated, and the organic or hydrocarbon waste is thermally decomposed into a combustible gas and solid carbon. The other four wastes are carbonized at high temperatures (about 700 to 1000 ° C.) and gradually fall (preheating and pyrolysis zones).

In the carbide moving bed 17, the organic or hydrocarbon-based substances in the waste 4 that have descended without gas decomposition in the fluidized bed 13 are further carbonized and gradually descend.

Next, in the high-temperature combustion / melting zone 15, the carbides and coke particles 6 are burned to generate a high-temperature flammable gas mainly containing CO, and to generate hydrogen gas by decomposition of the steam 11. On the other hand, waste 4
Such as metallic materials, glass materials or refractory materials
All substances that have not been burned or thermally decomposed are melted under high temperature conditions (about 1200 to 1500 ° C.).
That is, in the process where the waste 4 descends to the high-temperature combustion / melting zone 15, of the various metals mixed in the waste 4,
Some of the specific metals become fume dusts such as oxides and are discharged from the furnace top, but most of them become molten metals or are slagged by limestone grains 7 to melt metal oxides. (Melt and gasification zone).

Then, in the molten material separation zone and the pool 18, the molten metal and the molten slag are separated due to the difference in their physical properties, and the molten metal is accumulated on the bottom side. The molten metal and the molten slag are appropriately discharged from the discharge port 19. ,
The molten metal and molten slag discharged from the discharge port 19 also
As a part of so-called material recycling, it can be used as various metal substitutes, and as civil engineering and construction materials such as roadbed materials and concrete materials.

As described above, the organic or hydrocarbon-based waste is gasified using a gasification / melting furnace, and the recovered combustible gas is appropriately added to the combustible gas according to the cleanliness of the combustible gas and the recycling application. The flammable gas is subjected to a cleaning treatment, and the obtained flammable gas is blown into a blast furnace, where the flammable gas can be used as a heat source and an iron ore reducing material. It can be used as a partial substitute for coke in blast furnace operation. Here, the main component of the flammable gas 20 is C
O, consists _{H 2, CO 2, H 2} O and CH _4, also the temperature will vary by furnace operation conditions, about 800-1300
The high-temperature gas discharged at a temperature of about 300 ° C. is reduced to about 300 ° C. or less by a cleaning treatment mainly for removing dust.

In order to stably and reliably reduce the amount of coke used in the operation of the blast furnace by recycling the organic or hydrocarbon waste of the present invention, the flammable gas 20 generated in the gasification / melting furnace is used. It is important to increase the calorific value of the composition, and it is desirable to adjust the component composition to have a calorific value of 2000 kcal / Nm ³ or more. For this purpose, in the present invention, the types of waste to be received in the waste pit are limited to wastes containing organic wastes or hydrocarbon wastes. It is necessary to control the amount of oxygen gas to be blown into the gasification / melting furnace, the amount of steam to be blown into the gasification / melting furnace, and the furnace that manages the amount and temperature of the material. Here, in the present invention, by blowing steam, hydrogen gas can be generated, thereby enabling reduction of iron ore in the blast furnace and increase in calorific value. Further, in order to perform appropriate gas reforming in the free board part, the waste 4 is adjusted in order to adjust the height region of this part and to adjust the furnace temperature within an appropriate range, for example, about 800 to 1300 ° C. And the conditions for blowing oxygen gas and water vapor.

FIG. 3 is a flowchart for explaining a blast furnace operating method in which the combustible gas after the cleaning treatment is blown into the blast furnace for recycling. Combustible gas 20 after cleaning treatment
Is blown from the tuyere 21 of the blast furnace. The method and conditions for injecting the flammable gas 20 from the tuyere 21 basically depend on appropriate operating conditions specific to the blast furnace. When the charcoal 22 and the granular plastic 23 are blown, and when the flammable gas 20 is blown from the tuyere,
For example, blowing is performed as shown in FIG.
That is, FIG. 1A shows that pulverized coal 22 having excellent ignition / combustibility is first blown into the fluid of the hot air 12 from a lance 22a, and a granular plastic 23 which is inferior to ignition / combustibility than pulverized coal is injected in front of the lance 22a. A method of blowing high-temperature combustible gas 20 from the lance 20a while blowing the lance 23a to improve the combustibility of the granular plastic 23 is shown.

FIG. 4B shows a state in which the pulverized coal 22 and the granular plastic 23 are combined and mixed in advance in the high-speed transport pipe before the position where the blowing lance 25 is inserted into the blower branch pipe 24 of the hot air 12. And the mixed powder 22+
A method is shown in which a gas 23 is blown into the fluid of the hot air 12 from the blowing lance 25 and a relatively high temperature combustible gas is blown in front of the gas. In this manner, the combustible gas 20 can be efficiently used as a heat source and a reducing agent for iron ore in the blast furnace 3, and the state of the raceway 26 formed in front of the tuyere 21 is well maintained, Blast furnace operation can be stabilized.

Next, the flammable gas 20 is blown into the tuyere 2
Not only from 1, but also a gas-blowing tuyere (see 27 and 28 in FIG. 1) may be provided in the bosh section or the shaft section, and the whole or a part thereof may be blown alone. However, in the case where the combustible gas 20 is to be blown alone from the bosh section or the shaft section, the combustible gas 20 is partially burned before being blown or heated to a predetermined temperature, for example, 900 to 1100 ° C. Keep it high. Further, when the blast furnace 3 is shut down or the operation is unsatisfactory, the blowing of the flammable gas 20 into the blast furnace 3 may be stopped, and the flammable gas 20 may be sent to a heating furnace or the like in another manufacturing process in the steel mill through a bypass line. Alternatively, it may be used as a fuel for power generation. On the other hand, when the gasification / melting furnace is shut down, the decrease in the amount of heat supplied to the blast furnace due to the shutdown is dealt with by increasing the use of coke or pulverized coal.

As the gasification / melting furnace 1 in the present invention, any equipment having the above-described auxiliary equipment and functions may be used, and equipment such as a paused blast furnace may be used. Similarly, as for the gas cleaning device, an existing dust collecting device having a surplus can be used.

The present invention will be described with reference to the flow chart of the blast furnace facility including the gasification / melting furnace shown in FIG. 1 and the method for injecting the flammable gas into the blast furnace shown in FIG. −
This will be described in more detail with reference to 1 and 2.

(Embodiment Example 1) A gasification / melting furnace 1
Spent plastic having the composition shown in Table 1 is continuously charged from the furnace top at a charging rate of 10 t / h, coke granules 6 at 0.5 t / h, and limestone granules 7 at a charging speed of 0.1 t / h. .

[0044]

[Table 1]

On the other hand, pure oxygen gas 10 at normal temperature is blown at 5000 Nm ³ / h and steam 11 at 150 ° C. at a flow rate of 2500 kg / h from the tuyere 9 at the lower part of the gasification / melting furnace 1. However, it blows in 5: 3: 2 from each tuyere of the main tuyere 9a, the sub tuyere 9b, and the upper tuyere 9c provided in the peripheral wall of the furnace. The gas reforming temperature is operated at 1000 ° C.

The combustible gas generated in the furnace is subjected to a water cleaning treatment in the gas purifier 2 to collect the dust-removed and purified combustible gas. In this case, the temperature of the combustible gas at the furnace outlet is 1000 ° C., the pressure is 3000 mmH ₂ O,
After cleaning, the temperature is 300 ° C and the pressure is 21 ° C.
00mmH the ₂ O. The composition of the flammable gas after cleaning is as shown in Table 2, and the flammable gas flow rate is 18000 Nm ³ / h in terms of dry. This corresponds to a gasification efficiency of the waste 4 in the gasification / melting furnace 1 of about 77%. Here, the gasification efficiency is defined as the ratio of the energy efficiency recovered as gas energy to the retained energy of waste.

[0047]

[Table 2]

The obtained flammable gas 20 is transported to a blast furnace,
As shown in FIG. 3A, the hot air 12 is blown into the furnace from the tuyere 21 of the blast furnace 3 together with the pulverized coal 22 and the used granular plastic 23 in the flow of the hot air 12 that is blown into the furnace. The blast furnace 3 is a practical blast furnace having an internal volume of 2000 to 5000 m ³ class.

By recycling the used plastic to the blast furnace 3 by gasification, the operation results of the blast furnace 3 are as follows:
The amount of coke used is reduced, and the amount of CO ₂ emitted into the top gas of the blast furnace 3 is reduced. Table 3 shows the conditions for injecting the combustible gas 20 into the blast furnace 3, the amount of reduction in the amount of coke used in the blast furnace 3, the amount of CO ₂ component reduction in the furnace top gas, and other operating results. In the table, “recycling efficiency in the furnace” represents [(amount of gas energy used for reduction in the blast furnace) / (amount of gas energy input into the blast furnace)] × 100 (%). The “recycling efficiency” indicates [(amount of energy generated by gas discharged from the blast furnace top (furnace top gas)) / (amount of energy input to the blast furnace)] × 100 (%). (The same applies to Table 6.)

[0050]

[Table 3]

The amount of decrease in the amount of coke used in the blast furnace is as follows:
When converted to a coke ratio, it corresponds to 2.7 kg / t-hot metal.

(Embodiment 2) Here, shredder dust having a component composition shown in Table 4 was replaced with a shredder dust having a composition of 10 t / h in place of the used plastic as the charging waste in Embodiment 1. Charge continuously at the entry speed. The composition of the shredder dust is such that incombustibles are significantly increased and carbon and hydrogen contents are reduced to approximately 3/5 to 1/2 as compared with used plastics. Accordingly, the coke grains 6 are increased to 1.5 t / h, and the limestone grains 7 are increased to 0.2 t / h, and charged continuously from the furnace top, and operated according to the method of Embodiment Example-1. .

[0053]

[Table 4]

On the other hand, pure oxygen gas 10 at normal temperature is blown at 5000 Nm ³ / h and steam 11 at 150 ° C. at a flow rate of 2500 kg / h from the tuyere 9 at the lower part of the gasification / melting furnace 1. However, it blows in 5: 3: 2 from each tuyere of the main tuyere 9a, the sub tuyere 9b, and the upper tuyere 9c provided in the peripheral wall of the furnace. The furnace operates at 1000 ° C.

The combustible gas generated in the furnace is subjected to a water cleaning treatment in the gas cleaning device 2 to collect the dust-removed and cleaned combustible gas. In this case, the temperature of the combustible gas at the furnace outlet is 1000 ° C., the pressure is 3000 mmH ₂ O,
After cleaning, the temperature is 300 ° C and the pressure is 25 ° C.
00mmH the ₂ O. The component composition of the combustible gas after cleaning is as shown in Table 5, and the combustible gas flow rate is 13,000 Nm ³ / h in terms of dry. This corresponds to a gasification efficiency of the waste 4 in the gasification / melting furnace 1 of about 74%. The definition of gasification efficiency is the same as that described above.

[0056]

[Table 5]

The resulting combustible gas 20 is transported to a blast furnace,
As shown in FIG. 3B, the hot air 12 is blown into the furnace from the tuyere 21 of the blast furnace 3 together with the pulverized coal 22 and the used granular plastics 23 in the flow of the hot air 12 that is blown into the furnace. The blast furnace 3 is a practical blast furnace having an internal volume of 2000 to 5000 m ³ class.

By recycle to the blast furnace 3 by the gasification of the shredder dust, the operation result of the blast furnace 3 is reduced in the amount of coke used.
O ₂ emissions are reduced. Table 6 shows the conditions for injecting the combustible gas 20 into the blast furnace 3, the amount of decrease in the amount of coke used in the blast furnace 3, the amount of reduction in the CO ₂ component in the furnace top gas, and other operating results.

[0059]

[Table 6]

The amount of decrease in the amount of coke used in the blast furnace is as follows:
When converted to a coke ratio, it corresponds to 1.6 kg / t-hot metal.

[0061]

As described above, according to the method for recycling organic or hydrocarbon waste and the blast furnace equipment suitable for recycling according to the present invention, the organic or hydrocarbon waste recovered from industrial waste and general waste can be obtained. A large amount of combustible gas with a high calorific value can be efficiently generated from hydrocarbon waste, and this combustible gas is blown into a blast furnace to be used as fuel in the blast furnace and used as a reducing material for iron ore. be able to. Therefore, it contributes to a reduction in the amount of coke used in the blast furnace operation. Metals and slag by-produced in the gasification and melting furnace also contribute to material recycling of waste. Further, from the viewpoint of waste treatment, according to the method and the blast furnace facility of the present invention, a large amount of waste can be treated while maintaining environmental conservation.

According to the present invention, it is possible to provide a method for recycling such organic or hydrocarbon-based waste, and a blast furnace facility suitable for recycling such waste. Is brought.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a blast furnace facility including a gasification / melting furnace and the like, which is used when the method for recycling organic or hydrocarbon waste according to the present invention is performed.

FIG. 2 is a flowchart of signal processing of a current measurement value in the embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating a method for determining a signal processing result of a current measurement value according to an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Gasification / melting furnace 2 Gas purifier 2a Gas purifier bypass 3 Blast furnace 4 Waste 4a, 4b, 4c, ... Waste pit 5 Waste charging device 6 Coke particles 7 Limestone particles 8 Quantitative supply device 9 Tuyere (gasification / melting furnace) 9a Main tuyere 9b Secondary tuyere 9c Upper tuyere 10 Oxygen gas 11 Steam 12 Hot air 13 Fluidized bed 14 Raceway (at tuyere of gasification / melting furnace) 15 High temperature combustion / Melting zone 16 Free board 17 Carbide moving layer 18 Melt separating zone and pool section 19 Outlet 20 Combustible gas 20a (combustible gas injection) lance 21 Blast furnace tuyere 22 pulverized coal 22a (pulverized coal injection) lance 23 Granular plastic 23a (Granular plastic injection) Lance 24 Hot air blower branch 25 Injection run (of mixed powder of pulverized coal and granular plastic) 26 (of the blast furnace feather lip service) Raceway 27 (of blast furnace morning glory part) tuyeres 28 (of the blast furnace shaft subordinate part) tuyeres 29 raw materials instrumentation Irimen

Continued on the front page F term (reference) 3K061 AA16 AB02 AB03 AC01 AC13 AC17 BA01 BA07 CA07 CA08 DA02 DA19 DB16 DB20 4K015 AA02 AD01 AD05 AE10

Claims (6)

[Claims] An organic waste or a hydrocarbon-containing waste is melted and gasified using a vertical furnace, and the generated combustible gas is blown into a furnace of a blast furnace. To recycle organic or hydrocarbon waste. 2. A vertical furnace is charged with waste containing organic waste or hydrocarbon waste, a solid fuel and a solvent, and oxygen-containing gas and water vapor are fed into the vertical furnace. A method for recycling organic or hydrocarbon-based waste, comprising blowing a combustible gas into the vertical furnace and blowing the combustible gas into a furnace of a blast furnace. 3. The flammable gas generated by gasification of the waste in the vertical furnace is 2,000 kcal / Nm ^3.
3. The method for recycling organic or hydrocarbon waste according to claim 1 or 2, wherein the composition is adjusted to a component composition having the above calorific value. 4. As the vertical furnace, as a reaction and function zone in the furnace, a gas reforming zone, a preheating and pyrolysis zone, a carbide moving bed, a melting and gasification zone, 2. A furnace in which a melt separation zone and a pool is formed.
4. The method for recycling organic or hydrocarbon waste according to any one of claims 1 to 3. 5. The blowing of the combustible gas into the furnace of the blast furnace is performed by providing a tuyere provided at a tip of a hot-air blower tube and a tuyere for gas injection at a bosh section. One of the tuyere provided in the shaft portion and the tuyere provided in the shaft portion by providing a gas injection tuyere in the shaft portion.
The method is performed from more than one kind of tuyere.
4. The method for recycling organic or hydrocarbon waste according to any one of 4. 6. A vertical type in which a free board portion, a fluidized bed, a carbide moving bed, a high-temperature combustion / melting zone, a melt separation zone and a pool portion are formed in the furnace in order from the top to the bottom. For the recycling of organic or hydrocarbon waste, including a gasification / melting furnace and a blast furnace body equipped with ancillary equipment for blowing flammable gas generated in the vertical gasification / melting furnace into the furnace. Suitable blast furnace equipment.