JP3739026B2 - Waste treatment plant - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a pyrolysis reaction facility for pyrolyzing waste into pyrolysis gas and pyrolysis residue in a pyrolysis reactor, and combusts the pyrolysis gas and a carbon residue selected from the pyrolysis residue. A combustion melting facility for receiving and burning in the melting furnace, a boiler facility using the combustion gas of the combustion melting furnace as a heat source, a main burner in the combustion melting furnace being located in the flow path of the pyrolysis gas The present invention relates to a waste treatment plant provided in
[0002]
[Prior art]
In the above-mentioned waste treatment plant, when the waste treatment starts, when the amount of waste supplied to the pyrolysis reaction facility decreases, or when trouble occurs on the pyrolysis reaction facility side, a combustion melting furnace ( Hereinafter, the supply amount of the pyrolysis gas and the carbon residue to the “melting furnace” in this section and the like is reduced.
[0003]
Therefore, if the combustion with pyrolysis gas or the like is continued as it is, the temperature of the combustion gas in the melting furnace decreases, causing various problems in the boiler equipment and the equipment on the lower side using the generated steam ( For example, in a plant where power generation equipment is installed on the lower side of boiler equipment and steam turbines / generators are operated using steam from the boiler, power generation becomes impossible or operation of the steam turbine becomes unstable. To do).
[0004]
Therefore, at the start of the treatment of the above-mentioned waste, for example, the temperature of the combustion gas is raised by oiling in a melting furnace with an oil-fired main burner (hereinafter referred to as “main burner” in this section). Yes.
[0005]
Since the main burner is provided in a state in which the pyrolysis gas flows, the main burner is cooled by the pyrolysis gas during the normal operation in which the pyrolysis gas and the carbon residue are burned in the melting furnace. The temperature of the main body does not rise excessively, but the amount of pyrolysis gas supplied during oiling is small or zero, so the temperature of the burner main body rises excessively and the burner main body creeps. Is not unthinkable.
[0006]
In view of such a situation, conventionally, the burner body has been composed of a highly heat-resistant member.
[0007]
[Problems to be solved by the invention]
However, the high heat-resistant member corresponding to oiling in the melting furnace is expensive.
[0008]
In addition, there is a limit to the temperature that can be handled by a high heat resistant member, and even if the temperature of the high heat resistant member exceeds 1000 ° C., it cannot be said that creep destruction does not occur.
[0009]
An object of the present invention is to ensure that the main burner in the combustion melting furnace can be constructed at a low cost while the creep destruction of the main burner can be surely avoided.
[0010]
[Means for Solving the Problems]
The structure, operation, and effect of the invention according to claim 1 are as follows.
[0011]
[Constitution]
In the waste treatment plant described at the beginning, a pyrolysis gas pipe for circulating and guiding the pyrolysis gas from the pyrolysis reactor to the combustion melting furnace, or a main reactor boiler in the boiler equipment. A branch steam line branched from the steam line is connected in communication, and can be switched between a steam supply state in which steam is supplied to the combustion melting furnace via the branch steam line and a non-supply state in which no steam is supplied. Switching means is provided, and the main burner can be cooled by the steam by switching to the steam supply state by the switching means.
[0012]
[Action]
[I] For example, during oiling (that is, during burner combustion), the amount of pyrolysis gas supplied to the melting furnace is small or zero, so the main burner cannot be cooled with pyrolysis gas. The main burner can be cooled by switching to the steam supply state by means.
[0013]
That is, when switching to the steam supply state by the switching means, steam from the boiler flows through the branch steam line and the pyrolysis gas line and enters the melting furnace. Alternatively, when the steam supply state is switched by the switching means, the steam from the boiler flows through the branch steam line, the pyrolysis reactor, and the pyrolysis gas pipe and enters the melting furnace.
[0014]
In this case, since the main burner is located in the flow path of the pyrolysis gas, the main burner can be cooled by the steam flowing through the pyrolysis gas pipe.
[0015]
[B] Since the pyrolysis gas pipe for supplying the pyrolysis gas to the melting furnace is in a low oxygen or oxygen-free atmosphere, for example, the structure is such that air is supplied to the pyrolysis gas pipe to cool the burner body. In the apparatus, there is a problem that air enters the pyrolysis gas pipe in the low oxygen or oxygen-free atmosphere and the pyrolysis gas burns in the pyrolysis gas pipe. Since the steam is supplied to the gas pipeline, there is no such problem.
[0016]
[C] Since the main burner is cooled as described in [A] above, the burner body can be composed of a member having lower heat resistance than the conventional one.
[0017]
[D] The steam supplied to the pyrolysis reactor or pyrolysis gas pipe via the branch steam pipe is a part of the steam from the existing boiler, and the pyrolysis reactor or pyrolysis gas Since it is not necessary to provide a dedicated boiler for supplying to the pipeline, the equipment is not expensive.
[0018]
[E] Cost is not required as compared with a structure in which nitrogen gas or the like is supplied to the pyrolysis reactor or pyrolysis gas pipe to cool the main burner.
[0019]
[F] Drop the soot of the flow path with the steam flowing through the branch steam line and the pyrolysis gas pipe, or with the steam flowing through the branch steam line, the pyrolysis reactor, and the pyrolysis gas pipe. You can also.
[0020]
[effect]
Therefore, the above operations [A], [B], and [C] make it possible to reliably avoid the main burner from being destroyed by creep while the main burner in the combustion melting furnace can be constructed at a low cost.
[0021]
Further, the cost for cooling the main burner can be kept low by the actions [d] and [e], and the cooling of the pyrolysis gas flow path is performed together with the cooling of the main burner by the action [f]. I was able to do it.
[0022]
The structure, operation, and effect of the invention according to claim 2 are as follows.
[0023]
[Constitution]
In the configuration of the invention according to claim 1, a temperature sensor for detecting the temperature of the burner body of the main burner and a control means for controlling the switching means based on the detection result are provided, and the temperature of the burner body is a set value. When the temperature sensor detects that the temperature exceeds the limit, the control means controls the switching means to enter the steam supply state.
[0024]
[Action]
In addition to the effects similar to the effects of the configuration of the first aspect, the following effects can be achieved.
[0025]
When the temperature sensor detects that the temperature of the burner main body exceeds the set value, the control means controls the switching means based on the detection result to set the steam supply state.
[0026]
Since the steam supply state can be automatically set in this way, the operator does not have to switch the switching means one by one, and problems such as forgetting to switch can be avoided.
[0027]
[effect]
Therefore, the labor of the operator can be reduced, and the same effect as that of the structure of claim 1 can be obtained more easily.
[0028]
The structure, operation, and effect of the invention according to claim 3 are as follows.
[0029]
[Constitution]
In the configuration of the invention according to claim 1 or 2, the main burner is inserted into a pyrolysis gas pipe portion on the combustion melting furnace side, and the pyrolysis gas is around the main burner in the axial direction of the main burner. And flows into the combustion melting furnace.
[0030]
[Action]
In addition to being able to achieve the same effect as that of the structure of claim 1 or 2, the pyrolysis gas (or steam) flows around the main burner in the axial direction of the main burner, so that the main burner is cooled. It becomes easy to do.
[0031]
[effect]
Therefore, in addition to the effects similar to the effects of the configuration of claim 1 or 2, the cooling efficiency of the main burner can be increased, and the same effects as the effects of the configuration of claim 1 or 2 can be achieved. It became easier to get.
[0032]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0033]
FIG. 1 shows a pyrolysis gasification melting plant, which is a processing plant for household waste and other general waste and industrial waste such as car shredder dust and electrical appliances.
[0034]
This pyrolysis gasification and melting plant consists of pretreatment equipment 1, pyrolysis reaction equipment 2, pyrolysis residue sorting equipment 3, high temperature combustion melting equipment 4, boiler power generation equipment 5, exhaust gas treatment equipment 6, from waste to iron and aluminum -It is a plant that is suitable for global environmental conservation and a recycling-oriented environmental society, such as being able to collect valuable materials such as glass in a form that can be easily reused, with high thermal and power generation efficiency, low NOx and low dioxin.
[0035]
Next, processing of the waste by the pyrolysis gasification melting plant will be described.
[Pretreatment equipment 1]
The waste stored in the waste pit 7 is crushed to 150 mm square or less by the crusher 8, and the crushed waste is sent to the thermal decomposition reaction facility 2 by the transport device 9 or the like.
[0036]
[Pyrolysis reaction facility 2]
The waste from the waste pit 7 is received by the screw conveyor 10 into the conveyor case 11 and conveyed and supplied into the pyrolysis reactor 12, and the pyrolysis reactor 12 causes the waste to be about 450 ° in an oxygen-free or low-oxygen atmosphere. Pyrolysis into C pyrolysis gas and pyrolysis residue. The pyrolysis gas is sent to a high-temperature combustion melting furnace 13 (hereinafter referred to as “melting furnace 13”), and the pyrolysis residue is sent to the pyrolysis residue sorting equipment 3. The detailed structure of each part will be described later.
[0037]
[Pyrolysis residue sorting equipment 3]
The thermal decomposition residue from the thermal decomposition reaction facility 2 is selected by the coarse vibration screen 78, and the selected thermal decomposition residue is conveyed while being cooled by the cooling vibration conveyor 14, and is passed through the primary vibration screen 15, the cleaning drum 79, and the like. Then, valuable materials such as iron, aluminum, copper, and glass (hereinafter referred to as “irons”) are collected in the iron yard 16, and carbon residues other than iron are sent from the carbon residue silo 80 to the melting furnace 13.
[0038]
The cooling vibration conveyor 14 is a nitrogen-filled water-cooled jacket type, and cools the pyrolysis residue in a nitrogen atmosphere to a temperature at which ignition or the like does not occur (about 80 ° C.).
[0039]
[High-temperature combustion melting equipment 4]
Pyrolysis gas, carbon residue, and dust collection dust (ash from the boiler 18 and the electric dust collector 17 described later) are blown into the melting furnace 13 from the furnace top side, and these are swirled and burned. The collected dust is melted and discharged continuously from the furnace bottom. The detailed structure of each part will be described later.
[0040]
[Boiler power generation equipment 5]
The exhaust gas is cooled in the boiler radiation zone, made uniform in the evaporator tube group, sent to the superheated steam tube group at about 600 ° C., and sent to the electric dust collector 17 at about 200 ° C. through the economizer. Steam of 40 at 400 ° C. is recovered by the boiler 18 and recovered as electricity by the turbine 19 and the generator 20.
[0041]
[Exhaust gas treatment facility 6]
The gas cooling chamber 21, the electric dust collector 17, the bag filter 22, etc. are used for processing and exhausted from the chimney 25. Since the amount of exhaust gas is small, the exhaust gas treatment facility 6 can be installed even in a narrow space.
[0042]
Next, the thermal decomposition reaction facility 2 will be described.
[0043]
As shown in FIGS. 4 and 5, this pyrolysis reaction facility 2 is provided with a pyrolysis reactor 12 for pyrolyzing waste into pyrolysis gas and pyrolysis residue, and waste from the waste pit 7. Is provided in a state in which the conveyor case portion on the conveyance end side enters the pyrolysis reactor 12.
[0044]
The pyrolysis reactor 12 is provided with a horizontal rotary drum 27 for receiving waste from the screw conveyor 10 in the hollow, and a plurality of heat transfer tubes 28 for circulating a heating gas as a heat medium for heating waste. Provided in the hollow of the rotating drum 27 in a state along the longitudinal direction of the rotating drum 27, a heating gas supply unit 29 for the heat transfer tube 28, a heating gas discharge unit 30, and a pyrolysis gas / pyrolysis residue discharge unit 31. It is provided and configured.
[0045]
In the screw conveyor 10, the conveyance end side of the conveyor case 11 is connected to the one end surface side in the axial direction of the rotary drum 27.
[0046]
The rotating drum 27 is inclined so as to be positioned at the lower side in the waste conveyance direction, and the rotation axis is inclined about 1.5 degrees with respect to the installation surface.
[0047]
In this state, both ends in the longitudinal direction of the rotating drum 27 are individually supported by the pair of idler roller mechanisms 32 so as to be rotatable, and are provided on the outer periphery of the rotating drum portion between the idler roller mechanisms 32 over the entire circumference. The large-diameter gear 33 and the small-diameter gear 34 provided on the electric motor M1 supported by the support base 35 are meshed, and the rotary drum 27 is driven to rotate (1.5 rpm) by driving the electric motor M1. is there.
[0048]
The heat transfer tube 28 is installed across a pair of partition walls 36 and 37 provided separately at both ends of the rotating drum 27, and is in a state in which they are close to the inner wall surface of the rotating drum 27 as shown in FIG. A plurality of pipes (about 2/3 of the total number) are arranged, and a plurality of pipes (about 1 of the total number) are arranged so that the heat transfer tubes 28 are radially arranged on the inner side of the rotary drum 27 with respect to the heat transfer tubes 28. / Number of 3).
[0049]
As a result, as the rotary drum 27 rotates, the waste is scraped up by the heat transfer tube 28 and mixed and stirred, so that the heat of the heated gas is efficiently transmitted.
[0050]
A waste discharge pipe 38 concentric with the rotary drum 27 is extended to the lower side in the transport direction from the partition wall 37 on the lower side in the waste transport direction.
[0051]
The heated gas supply unit 29 is configured so that the heated gas supply case 40 having the heated gas supply port 39 surrounds the intermediate portion in the longitudinal direction of the waste discharge pipe 38 and allows the rotating drum 27 to rotate. The position is fixed to the support base 35.
[0052]
The heated gas supply port 39 is supplied with heated gas from a hot air generating furnace 41. The temperature of the heated gas supplied is about 530 ° C.
[0053]
The heated gas discharge unit 30 surrounds the heated gas discharge case 43 provided with the heated gas discharge port 42 so as to surround a conveyor case portion over a predetermined length of the screw conveyor 10 and allows the rotary drum 27 to rotate. The position is fixed to the support base 35. The temperature of the heated gas discharged from the heated gas discharge port 42 is about 300 ° C.
[0054]
The pyrolysis gas / pyrolysis residue discharge part 31 connects the pyrolysis gas / pyrolysis residue discharge case 45 to the waste discharge pipe portion protruding from the heating gas discharge case 43 to discharge the pyrolysis gas / pyrolysis residue. A pyrolysis gas discharge port 46 is formed on the upper end side of the case 45, and a pyrolysis residue discharge port 47 is formed on the lower end side.
[0055]
The screw conveyor 10 is supported on the carriage 48 on the support base 35 at the conveyance start end side, and is set in a concentric posture with the rotary drum 27 to convey waste among the partition walls 36 and 37 of the rotary drum 27. The end of the conveyor case faces the central hole provided in the partition 36 on the upper side in the direction, and a waste supply port is formed on the upper surface side of the conveyor case portion on the conveyance start side, and interlocked with the electric motor M2 on the carriage 48 The screw shaft 51 is provided with a screw blade 51.
[0056]
Maintenance work or the like is performed by moving the carriage 48 and extracting the screw conveyor 10 from the rotary drum 27.
[0057]
A sealing mechanism is provided between a fixed portion such as the heating gas supply case 40 and the heating gas discharge case 43 and the rotary drum 27 to prevent inflow of air and leakage of the heating gas.
[0058]
Next, the high temperature combustion melting equipment 4 will be described.
[0059]
As shown in FIGS. 2 and 3, the end portion of the pyrolysis gas pipe 52 through which the pyrolysis gas from the pyrolysis reactor 12 is circulated is connected to the furnace top of the melting furnace 13 from above, and the pyrolysis is performed. A carbon residue blowing portion 54 and a dust collecting dust blowing portion 55 are provided in the furnace top portion in the vicinity of the gas blowing portion 53.
[0060]
The dust collecting dust blown into the dust collecting dust blowing section 55 is ash discharged from the boiler 18, the gas cooling chamber 21, and the electric dust collector 17, and these ash is collected in the ash silo 76 by the ash collecting conveyor 77 and the like. A blower 75 supplies the dust collection dust blowing part 55 to the side.
[0061]
An oil-fired main burner 61 (hereinafter referred to as “main burner”) that uses kerosene as fuel is provided in a downward position at the top of the furnace, so that waste is supplied to the pyrolysis reaction facility 2 at the start of waste treatment. It is made to burn when the amount decreases or when trouble occurs on the pyrolysis reaction facility 2 side.
[0062]
That is, at the start of the treatment of the waste, etc., the supply amount of pyrolysis gas and carbon residue to the melting furnace 13 is small, and therefore, combustion with pyrolysis gas or the like continued as it is. Therefore, there is a problem that the temperature of the combustion gas in the melting furnace 13 is lowered, the operation of the boiler 18, the steam turbine 19, and the like becomes unstable and power generation becomes impossible.
[0063]
Therefore, at the start of the above-described waste treatment, the main burner 61 is used for oiling to raise the temperature of the combustion gas and avoid the above problems.
[0064]
The main burner 61 includes an outer cylinder 62 (corresponding to the burner main body) that circulates air from the air pipe 60 and an inner cylinder 63 (corresponding to the burner main body, inserted into the outer cylinder 62 in a concentric manner). And the first half side of the outer cylinder 62 and the inner cylinder 63 is inserted into the end side of the pyrolysis gas pipe 52 (that is, located in the pyrolysis gas flow path) to perform pyrolysis. The gas flows around the outer cylinder 62 in the axial direction of the outer cylinder 62 and enters the melting furnace 13.
[0065]
With this structure, the main burner 61 can be cooled with the pyrolysis gas during normal operation in which the pyrolysis gas / carbon residue is combusted, and excessive temperature rise of the outer cylinder 62 and the inner cylinder 63 can be prevented. .
[0066]
At the top of the furnace around the pyrolysis gas blowing portion 53, an ignition burner 82 which becomes a fire type when the main burner 61 is ignited, and a pilot burner 83 (see FIG. 2) for stably burning the pyrolysis gas. One inspection port 84 and one frame eye 85 (a camera for observing flames) are provided one by one.
[0067]
Further, a plurality of primary combustion air first inlets 56A are distributed and arranged at the top of the furnace around the pyrolysis gas injection portion 53 (and the front end portion of the main burner 61). A primary combustion air second blow-in port 56B is formed around, and a space between the outer cylinder 62 and the inner cylinder 63 of the main burner 61 is formed in the primary combustion air third blow-in port 56C.
[0068]
A plurality of secondary combustion air blowing ports 57 and tertiary combustion air blowing ports 58 in a lateral orientation are distributed in the circumferential direction on the slightly upper side of the furnace wall and substantially in the center in the vertical direction.
[0069]
Air is supplied to the air blowing ports 56A, 56B, 56C, 57, and 58 by causing air to flow through the air duct 60 by the pushing fan 59.
[0070]
The exhaust gas from the bag filter 22 is circulated through a recirculation exhaust gas pipe 71 by an exhaust gas recirculation fan 68 and supplied into the furnace. A plurality of secondary combustion air blowing ports 69 and tertiary combustion air blowing ports 86 for blowing the exhaust gas are referred to as the secondary combustion air blowing port 57 and the tertiary combustion air blowing port 58 on the air duct 60 side. Separately and in a distributed manner in the circumferential direction corresponding to them.
[0071]
Since the exhaust gas blown into the furnace as secondary combustion air or tertiary combustion air has a higher temperature than the outside air, the temperature inside the furnace is lowered by the secondary combustion air or the tertiary combustion air compared to the case where the outside air is blown into the furnace. There is an advantage that it is difficult.
[0072]
With the above structure, the dust collection dust and carbon residue blown into the furnace are swirled. The dust collected is melted, and the molten slag flows along the furnace wall to the lower part of the furnace, and is conveyed to the slag yard 74 via the granulating conveyor 72 and the slag yard conveyor 73.
[0073]
The uppermost first zone Z1 in the furnace has an air ratio of 0.7 and a temperature of 1250 ° C, and the lower second zone Z2 has an air ratio of 0.9 and a temperature of 1350 ° C, and is located below the second zone Z2. The third zone Z3 burns at an air ratio of 1.3 and a temperature of 1400 ° C, and the lowermost fourth zone Z4 maintains an air ratio of 1.3 and a temperature of 1280 ° C by exhaust gas recirculation.
[0074]
Since the waste is converted into fuel by the thermal decomposition reaction facility 2, it can be burned at a low air ratio, and exhaust gas is reduced by the low air ratio combustion. Further, as described above, multistage combustion / exhaust gas recirculation is used to reduce NOx, and a sufficient residence time in the furnace (2 seconds or more) is taken to reduce dioxin.
[0075]
The melting furnace 13 has a water-cooled refractory structure, and is configured so that the temperature of the refractory does not become high and the surface temperature of the refractory is slightly lower than the melting temperature of the slag. A slag self-coating layer is formed on the refractory surface. This self-coating layer functions as a refractory protective layer and prevents refractory erosion.
[0076]
By the way, since the supply amount of pyrolysis gas is small or zero during oil burning (that is, during burner combustion), the outer cylinder 62 and the inner cylinder 63 of the main burner can be cooled with pyrolysis gas. Rather, these temperatures increase.
[0077]
Considering this point, the branch steam pipe 64 branched from the main steam pipe 70 of the boiler 18 is connected to the pyrolysis gas pipe 52 so that the main burner 61 can be cooled with steam.
[0078]
More specifically, a switching valve 65 (switching means) that can be switched between a steam supply state in which steam is supplied from the cracked gas pipe 52 to the melting furnace 13 and a non-supply state in which no steam is supplied via the branch steam line 64. And a thermocouple 66 (corresponding to a temperature sensor) for detecting the temperature of the outer cylinder 62 is attached to the outer wall of the outer cylinder 62, and the detected value of the thermocouple 68 is 700 ° C. (corresponding to a set value). Is exceeded, a control device 67 (corresponding to control means) is provided for controlling the opening of the switching valve 65 so as to be in the steam supply state based on the detection result.
[0079]
Once in the steam supply state, the steam supply state may be continued until oiling is finished. When the detection value of the thermocouple 66 is 700 ° C. or less, the non-supply state is set. You may comprise so that the switching valve 65 may be controlled by the control apparatus 67. FIG.
[0080]
With the above structure, the outer cylinder 62 and the inner cylinder 62 of the main burner 61 can be cooled with steam during oiling, so that an excessive increase in their temperature can be avoided and creep destruction can be avoided.
[0081]
The steam has a temperature of 260 ° C., a pressure of 5 Kg / Cm ² , and a supply amount of 500 Kg / hr (per hour).
[0082]
As shown in FIG. 1, the branch steam pipe 64 has a pipe part on the tip side branched into a plurality of parts, and each pipe part is connected to the pyrolysis gas pipe 52 at a predetermined interval. The soot adhering to the inner wall of the pyrolysis gas pipe 52 can be removed with steam.
[0083]
As described above, the steam supply system via the branch steam pipe 64 has a structure in which the cooling means of the main burner 61 and the soot blower are combined. When operating as a soot blower, steam is supplied to the pyrolysis gas line 52 through all the line parts.
[0084]
When the main burner 61 is operated for cooling, steam is supplied to the pyrolysis gas pipe 52 through one of the pipe parts. In addition, you may supply a vapor | steam to the pyrolysis gas pipe line 52 through all the pipe line parts or some of those pipe line parts.
[0085]
[Another embodiment]
In the above embodiment, the branch steam line 64 is connected in communication with the pyrolysis gas pipe 52, but the branch steam line 64 may be connected in communication with the pyrolysis reactor 12.
[0086]
The temperature sensor 66 may be composed of a sensor other than a thermocouple.
[0087]
The main burner 61 may be a burner using gas as fuel, or a burner using solid such as pulverized coal as fuel.
[0088]
The temperature sensor may detect the temperature of the space around the outer cylinder 62 and the control device 67 may switch the switching valve 65 based on the detection result.
[0089]
In the above-described embodiment, the switching device 65 is controlled to be switched by the control device 67 based on the detection result of the temperature sensor 66. However, without the temperature sensor 66 or the control device 67, the above-described operation is performed upon oiling. The switching valve 65 may be configured to be switched manually.
[0090]
Each numerical value shown in the above embodiment is an example and can be appropriately changed.
[Brief description of the drawings]
[Fig. 1] Schematic diagram of pyrolysis gasification melting plant [Fig. 2] Schematic diagram showing high temperature combustion melting furnace and surrounding structure [Fig. 3] Longitudinal sectional view of the top of high temperature combustion melting furnace [Fig. Schematic longitudinal front view of the decomposition reaction facility [Fig. 5] Vertical section of the pyrolysis drum [Explanation of symbols]
2 pyrolysis reaction equipment 4 combustion melting equipment 5 boiler equipment 12 pyrolysis reactor 13 combustion melting furnace 18 boiler 52 pyrolysis gas pipe 61 main burner 64 branch steam pipe 65 switching means 66 temperature sensor 67 control means 70 main steam pipe Road

Claims (3)

A pyrolysis reaction facility is provided to pyrolyze waste into pyrolysis gas and pyrolysis residue in a pyrolysis reactor, and the pyrolysis gas and carbon residue selected from the pyrolysis residue are received in a combustion melting furnace. Combustion and melting equipment for combustion is provided, boiler equipment using the combustion gas of the combustion and melting furnace as a heat source is provided, and a main burner is provided in the combustion and melting furnace in a state located in the flow path of the pyrolysis gas. A waste treatment plant,
A pyrolysis gas pipe for circulating and guiding the pyrolysis gas from the pyrolysis reactor to the combustion melting furnace, or a branched steam pipe branched from the main steam pipe of the boiler in the boiler equipment to the pyrolysis reactor And a switching means capable of switching between a steam supply state in which steam is supplied to the combustion melting furnace via the branch steam line and a non-supply state in which no steam is supplied. A waste treatment plant configured such that the main burner can be cooled with the steam by switching to the steam supply state. A temperature sensor for detecting the temperature of the burner body of the main burner and a control means for controlling the switching means based on the detection result are provided, and the temperature sensor detects that the temperature of the burner body has exceeded a set value. 2. The waste treatment plant according to claim 1, wherein, when detected, the control means controls the switching means so as to be in the steam supply state. The main burner is inserted into the pyrolysis gas conduit portion on the combustion melting furnace side, and the pyrolysis gas flows around the main burner in the axial direction of the main burner and enters the combustion melting furnace. The waste treatment plant according to claim 1 or 2.

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