JP2021098619A - Fuel-producing apparatus and fuel-producing method for combustible waste - Google Patents

Abstract

To effectively use a combustible waste that is extremely difficult to treat, by stably feeding the combustible waste to a main burner in a cement kiln as an alternate fuel.SOLUTION: A fuel-producing apparatus 1 for a combustible waste includes: carbonization gasification furnaces 2 (2A to 2C), two or more thereof being arranged in parallel, for performing carbonization gasification of the combustible waste; a flow controller 4 for alternately operating two or more carbonization gasification furnaces to control the flow of a carbonization gas (mixed gas) to be discharged from the operating carbonization gasification furnaces; and supplying means (a fan 5 and the like) for supplying the carbonization gasification gas, the flow amount of which is controlled by the flow controller, continuously to a main burner 10a in a cement kiln 10. The carbonization gasification furnace can open a ceiling part 2a and bottom section 2b thereof and can have a capacity of 50 m3 or more. In the supplying means, a differential pressure-type flow amount-measuring apparatus can be mounted on a pipeline in which the carbonization gasification gasses each discharged from the carbonization gasification furnaces are mixed and thereafter go toward the main burner, the flow-amount measuring apparatus measuring a flow amount of the carbonization gasification gas that flows in the pipeline.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fuel conversion device and a fuel conversion method for combustible waste, and more particularly to a technique for converting combustible waste that is difficult to process in a cement manufacturing process into fuel.

There are two combustion zones in the cement manufacturing process, one is a kiln butt and a calciner for promoting the decarbonization reaction from calcium carbonate, and the other is firing clinker, which is an intermediate product of cement. Cement kiln. Burners are installed in each of the calciner and the cement kiln, and the main burner installed in front of the kiln of the cement kiln is particularly important for determining the quality of the clinker.

The fuel used in the above two combustion zones was heavy oil before the oil crisis, but pulverized coal is used after the oil crisis. In addition, the utilization of waste as cement fuel began in the 1980s as an alternative fuel for waste tires, and has been carried out in various forms from the 1990s to the present.

In the combustion zone of kilns and calciners, the input port for combustible waste can be enlarged, the combustion time can be lengthened, and the quality of the clinker cannot be determined, which hinders the transportation system. Unless otherwise, the physical properties of combustible waste are not limited. As a result, all of the fuel used in kilns and calciners has now been replaced by flammable waste.

On the other hand, the main burner of the cement kiln determines the quality of the clinker, so the burner frame must be stable. Therefore, it is restricted by the physical properties of combustible waste as an alternative fuel for the main burner, the ease of inputting combustible waste, the combustion time, and the like. At present, the alternative fuel for the main burner is limited to waste oil that is easy to put in and solids that are easy to process such as hard plastic, and the replacement of the main burner fuel with combustible waste is only about 30%.

Therefore, for example, Patent Documents 1 and 2 disclose a technique for converting waste plastic or the like into dry distillation gas with an external heat type kiln or the like and utilizing it as an alternative fuel for a main burner or the like of a cement kiln.

JP-A-2002-195524 Japanese Unexamined Patent Publication No. 2003-261887

However, in the inventions described in Patent Documents 1 and 2, when flammable waste such as fishing nets and agricultural vinyl, which is extremely difficult to process, is used as an alternative fuel for the main burner of a cement kiln, the inside of the dry distillation gasification furnace is used. There was a problem that hydrocarbons adhered to the fuel, and there was a risk that it could not be supplied stably.

Therefore, the present invention has been made in view of the above-mentioned problems in the prior art, and is capable of stably supplying combustible waste, which is extremely difficult to process, to the main burner of a cement kiln as an alternative fuel for effective use. It is an object of the present invention to provide a fuel conversion device and a fuel conversion method for combustible waste that can be used.

In order to achieve the above object, the present invention is a carbonization device for combustible waste, in which two or more units are installed in parallel to carbonize combustible waste into a dry distillation gas, and two or more units thereof. A flow controller that alternately operates the carbonization gasification furnaces of the carbonization of the above to adjust the flow rate of the carbonization gas discharged from the carbonization gasification furnace in operation, and the dry distillation gas whose flow rate is adjusted by the flow rate regulator It is characterized by being provided with a supply means for continuously supplying the main burner.

According to the present invention, by installing two or more dry distillation gasification furnaces in parallel and operating them alternately, it is possible to prevent adhesion of hydrocarbons to the inside of the dry distillation gasification furnace. Difficult combustible waste can be stably supplied to the main burner of a cement kiln as an alternative fuel for pulverized carbonization. As a result, the fuel alternative rate of the main burner can be improved, and the amount of fossil fuel used can be reduced.

In the above combustible waste fuel conversion device, the dry distillation gasification furnace is capable of opening the ceiling and the bottom of the furnace ^{and having a volume of 50 m 3} or more, so that the combustible waste is efficiently converted into dry distillation gas. be able to.

Further, the supply means is a differential pressure type that measures the flow rate of the dry distillation gas flowing through the pipe toward the main burner after the dry distillation gas discharged from each of the two or more dry distillation gas furnaces merges. By providing a flow rate measuring device, it is possible to grasp the amount of dry distillation gas supplied to the main burner.

Further, by providing a magnetic force sorter, an eddy current sorter and / or a wind power sorter that separates and recovers the metal residue and the cement raw material substitute from the incinerator residue of the dry distillation gasification furnace, the incinerator residue of the dry distillation gasification furnace is effective. It can be used.

Further, by providing a water washing device for removing chlorine contained in the cement raw material substitute, it is possible to avoid adversely affecting the cement quality even if the cement raw material substitute is used as the cement raw material.

Further, the present invention is a method for converting combustible waste into fuel, in which two or more carbonization gasification furnaces for carbonizing combustible waste are installed in parallel to convert the two or more carbonization gas into dry distillation gas. It is characterized by alternately operating the furnaces, adjusting the flow rate of the dry distillation gas discharged from the operating dry distillation gasification furnace, and continuously supplying the adjusted dry distillation gas to the main burner of the cement kiln. To do. According to the present invention, combustible waste that is extremely difficult to process can be stably supplied to the main burner as an alternative fuel, and the amount of fossil fuel used can be reduced.

As described above, according to the present invention, combustible waste that is extremely difficult to process can be stably supplied to the main burner of a cement kiln as an alternative fuel for pulverized coal and can be effectively used.

It is an overall block diagram which shows one Embodiment of the fuel conversion apparatus of combustible waste which concerns on this invention.

Next, a mode for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a combustible waste fuel conversion device according to the present invention, in which the combustible waste fuel conversion device 1 includes a dry distillation gasification furnace 2 (2A to 2C) and a dry distillation gas. A damper 3 (3A to 3C) provided at the outlet of the chemical furnace 2 and a flow regulator 4 for adjusting the flow rate of the combined gas G of the carbonization gas G1 to G3 discharged from the carbonization gasification furnace 2 (2A to 2C). , A fan (supply means) 5 for continuously supplying the confluent gas G to the main burner 10a of the cement kiln 10 and a metal for recovering the metal residue from the incineration residue R discharged from the carbonization gasization furnace 2 of the confluence gas G. It is composed of a residue recovery device 6 and a water washing device 7 for washing and desalting the incineration residue R1 after recovering the metal residue.

A plurality of dry distillation gasification furnaces 2 (three in the illustrated example) are installed in parallel, each having a cylindrical main body 2c having a diameter of 2 m or more, and a ceiling portion 2a and a furnace bottom portion 2b can be opened and closed. , Combustible waste W, which is difficult to process, such as agricultural vinyl and flexible container inclusions, can be input as it is. It is desirable to install at least two dry distillation gasification furnaces 2 and three or more in consideration of operation. ^{The capacity per unit of the carbonization gasification furnace 2 should be 50 m 3} or more in consideration of the burnout time of the combustible waste W and the timing of switching the operation of the carbonization gasification furnaces 2 (2A to 2C). preferable.

The main burner 10a is connected from each of the carbonization gasification furnaces 2 (2A to 2C) by a pipe, and a fan 5 is installed in the middle of the flow path of the pipe so that the dry distillation gasification furnace 2 side has a negative pressure. Is supplied to the main burner 10a.

The flow rate regulator 4 is provided to adjust the flow rate of the merging gas G, and the flow rate of the merging gas G is measured by a differential pressure type flow rate measuring device (not shown) arranged in a pipeline through which the merging gas G flows. As shown in the illustrated example, the flow rate of the merged gas G can be adjusted by the dampers 3 (3A to 3C) provided in each pipe of the carbonization gasification furnaces 2 (2A to 2C), but the fan 5 It is also possible to install an inverter fan in each carbonization gasification furnace 2 without installing the above.

The metal residue recovery device 6 is a magnetic force sorter, an eddy current sorter and / or a wind power sorter, and is selectively installed according to the type and amount of the metal residue to be recovered. Further, the water washing device 7 is provided to remove chlorine and the like contained in the incinerator residue R1, and a filter press or the like is used.

Next, the operation of the combustible waste fuel conversion device 1 having the above configuration will be described.

As shown in the carbonization gasification furnace 2A, which is one of the carbonization gasification furnaces 2, the ceiling portion 2a is opened and combustible waste W such as a fishing net is charged. Next, as shown in the dry distillation gasification furnace 2B, after closing the ceiling portion 2a, the charged combustible waste W is ignited with a gas or kerosene burner (not shown), and after ignition, it is self-combusted to perform dry distillation. Gas G2 is generated, and the combined gas G containing the generated dry distillation gas G2 is guided by the fan 5 to the main burner 10a of the cement kiln 10.

The supply amount of the confluent gas G to the main burner 10a is the damper 3 (3A to 3C) at the outlet of the dry distillation gasification furnace 2 which is operating by alternately operating the three dry distillation gasification furnaces 2 (2A to 2C). (Damper 3B is open in FIG. 1), the flow rate of the merging gas G is measured by a differential pressure type flow rate measuring device, and the flow rate of the merging gas G is adjusted by the flow rate regulator 4.

As shown in the carbonization gasification furnace 2C, after the self-combustion of the combustible waste W is completed, the temperature is naturally lowered for several hours, and after the natural temperature is lowered, the bottom 2b of the furnace is opened to discharge the incinerator residue R.

The incineration residue R after discharge recovers the metal residue H by the metal residue recovery device 6, and the incineration residue R1 after collecting the metal residue H is washed with water and desalted by the water washing device 7 to remove chlorine Cl. , Used as a cement raw material as incineration residue R2. Since the incinerator residue R2 has metal residue and chlorine removed, it does not adversely affect the quality of cement.

As described above, according to the present embodiment, two or more carbonization gasification furnaces 2 are installed in parallel, and these are operated alternately to convert combustible waste W such as a fishing net, which is difficult to process, into fuel. Even in this case, since the flammable waste W burns out in each carbonization gasification furnace 2, it is possible to prevent adhesion of hydrocarbons into the carbonization gasification furnace 2 and the like. It can be stably supplied to the main burner 10a. As a result, the heat possessed by the combustible waste W, which has not been disposed of other than incineration, can be effectively utilized for cement production, the fuel alternative rate of the main burner 10a can be improved, and the fossil fuel The amount used can be reduced. In addition, the burden of exhaust gas and incinerator ash generated when the combustible waste W is treated is almost eliminated. If there is a margin in the supply amount of the combined gas G, it may be used as an alternative fuel for the kiln tail or the calcining furnace in addition to the main burner 10a.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment of the present invention, and various modifications and applications can be made without departing from the gist of the present invention. Is.

1 Combustible waste fueling device 2 (2A-2C) Carbonization gasifier 2a Ceiling 2b Furnace bottom 2c Main body 3 (3A-3C) Damper 4 Flow regulator 5 Fan 6 Metal residue recovery device 7 Water washing device 10 Cement Kiln 10a Main burner Cl Chlorine G Combined gas G1 to G3 Carbonization gas H Metal residue R, R1, R2 Incinerator residue W Combustible waste

Claims (6)

Two or more carbonization gasifiers installed in parallel to convert combustible waste into carbonization gas, and
A flow rate regulator that alternately operates the two or more carbonization gasifiers and adjusts the flow rate of the carbonization gas discharged from the operating carbonization gasifiers.
A combustible waste fueling device comprising a supply means for continuously supplying a dry distillation gas whose flow rate has been adjusted by the flow rate regulator to a main burner of a cement kiln. The combustible waste fuel conversion device according to claim 1, wherein the dry distillation gasification furnace has a ceiling portion and a furnace bottom portion that can be opened ^{and has a volume of 50 m 3 or more.} The supply means is a differential pressure type flow rate measurement for measuring the flow rate of the dry distillation gas flowing through the pipe toward the main burner after the dry distillation gas discharged from each of the two or more carbonization gas furnaces merges. The combustible waste fueling device according to claim 1 or 2, further comprising a container. The invention according to claim 1, 2 or 3, further comprising a magnetic force sorter, an eddy current sorter and / and a wind sorter for separating and recovering the metal residue and the cement raw material substitute from the incinerator residue of the carbonization gasification furnace. Combustible waste fueling equipment. The fuel conversion device for combustible waste according to claim 4, further comprising a water washing device for removing chlorine contained in the cement raw material substitute. Two or more dry distillation gasifiers for carbonizing combustible waste into dry distillation gas were installed in parallel.
The two or more carbonization gasifiers are operated alternately to adjust the flow rate of the carbonization gas discharged from the operating carbonization gasifiers.
A method for fueling combustible waste, which comprises continuously supplying the dry distillation gas having an adjusted flow rate to the main burner of a cement kiln.

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