JP3507807B2 - Pyrolysis equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided with a pyrolysis drum which indirectly heats waste with a heating gas supplied from a heating gas supply unit to thermally decompose the thermal decomposition residue and thermal decomposition gas.
The pre-pyrolysis drum relates to a pyrolysis facility in which a heating gas receiving unit, a heating pipe through which the heating gas is passed, and a heating gas discharge unit are provided in the pyrolysis drum body.

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Patent Laid-Open No. 2000-314511, a heating gas supply unit in the above thermal decomposition equipment is a hot stove that burns fossil fuel such as kerosene to generate heating gas. A heating gas circulating blower for circulating the heating gas is provided so that the heating gas is supplied to the heating gas receiving portion of the pyrolysis drum and returned from the heating gas discharge portion to the hot stove side. So, I had to keep burning the fossil fuel in the hot stove while the pyrolysis drum was in operation.

[0003]

According to the above-mentioned conventional structure, since the fossil fuel must be continuously burned in the hot stove during the operation of the pyrolysis drum, the fuel costs a lot and the operating cost is high. There was a problem that would be high.

In order to solve this problem, the pyrolysis drum is heated at the exit side of the combustion exhaust gas of the combustion melting furnace for burning the pyrolysis gas from the pyrolysis drum and the carbon residue selected from the pyrolysis residue. A technique has been proposed in which a heater for indirectly heating the gas from the gas discharge portion with the combustion exhaust gas is provided.

However, since a large amount of hydrogen chloride is contained in the combustion exhaust gas of the combustion melting furnace, there is a new problem that the heater is easily corroded by hydrogen chloride.

The present invention has been made in view of the above situation, and an object thereof is to suppress corrosion of a heating gas supply unit and a heating tube of a pyrolysis drum without providing a heater while reducing operating costs. The point is to provide a thermal decomposition equipment that can do.

[0007]

The constitution, operation and effect of the invention according to claim 1 are as follows.

[Structure] In the thermal decomposition equipment described at the beginning, the heating gas supply unit is composed of a heating gas first supply means for starting operation and a heating gas second supply means for operation after starting operation. Is provided so as to be switchable between a heating gas supply state and a non-supplying state, and the heating gas second supply means heats a predetermined amount of the thermal decomposition gas from the thermal decomposition gas from the thermal decomposition drum. A cracked gas combustor is provided, and the gas discharged from the heating gas discharge part of the pyrolysis drum and collected on the gas recovery path side is mixed with the combustion exhaust gas from the pyrolysis gas combustor to generate the heating gas. A gas mixer is provided, and a gas neutralization processing device for neutralizing the gas from the heating gas discharge part is provided in the gas recovery passage.

[Operation] With the above configuration, as an example, the operation can be performed as follows.

[B] When starting the operation of the thermal decomposition drum, the heating gas first supply means is set to the heating gas supply state side. Then, for example, a burner provided in the heating gas first supply means burns fossil fuel such as kerosene to generate heating gas, which is supplied to the heating gas receiving portion of the pyrolysis drum.

[B] When the pyrolysis gas and the pyrolysis residue are discharged from the pyrolysis drum, the heating gas second supply means is also switched to the gas supply side, and the pyrolysis gas from the pyrolysis drum is discharged. A predetermined amount of pyrolysis gas is introduced into the pyrolysis gas combustor and burned.

Then, the gas discharged from the heating gas discharge portion of the pyrolysis drum and collected in the gas recovery passage and the combustion exhaust gas from the pyrolysis gas combustor are mixed by a gas mixer to generate heating gas. The heating gas is supplied to the heating gas receiving portion of the pyrolysis drum.

By the way, about 25% of chlorine contained in the waste is transferred to the thermal decomposition gas and about 75% is transferred to the thermal decomposition residue. Therefore, when only the pyrolysis gas is burned in the pyrolysis gas combustor, the HCl concentration in the combustion exhaust gas is when the pyrolysis residue and the pyrolysis gas are burned together, or when only the pyrolysis residue is burned. Is lower than the HCl concentration in the combustion exhaust gas.

However, in the case of the former, it is possible to eliminate the problem that the heating pipe of the pyrolysis drum is corroded.
It is not as low as the Cl concentration.

Therefore, the gas from the heated gas discharge portion is neutralized by the gas neutralization processing device provided in the gas recovery passage and then supplied to the gas mixer.

That is, the pyrolysis gas combustor burns only the pyrolysis gas separately from the pyrolysis residue to obtain a combustion exhaust gas having a low HCl concentration, and the combustion exhaust gas having a low HCl concentration is neutralized. Since the heated gas is generated by mixing the above-described gas (gas from the heated gas discharge part), the HCl concentration in the heated gas supplied to the heated gas receiving part side can be further lowered.

By operating as described above, the amount of pyrolysis gas burned in the pyrolysis gas combustor is gradually increased, and the amount of fossil fuel burned in the heating gas first supply means is gradually reduced. To go.

[C] When the amount of the pyrolysis gas discharged from the pyrolysis drum reaches the set amount, the gas supply operation of the heating gas first supply means is stopped to bring it into the non-supplying state, and the heating gas second
The heating gas is sent to the heating gas receiving section only by the supply means.
Steady operation starts in this state.

[D] Since the operation can be performed as described in [a] to [c] above, in the first heating gas supply means, only during the above [a] and [b] before the steady operation is started. It suffices to burn fossil fuels, which consumes less fossil fuels.

[Effect] Therefore, the above-mentioned actions [a] to [d]
As a result, it is possible to provide a thermal decomposition facility that can reduce the operating cost, suppress a decrease in operating rate, and suppress corrosion of the heating gas supply unit and the heating pipe of the thermal decomposition drum.

The constitution, operation and effect of the invention according to claim 2 are as follows.

[Structure] In the structure of the present invention according to claim 1, the gas neutralization processing device comprises a neutralizing agent supply mechanism for supplying a neutralizing agent to the gas recovery passage, and neutralizes the gas mixer and the gas mixer. A bag filter is provided between the agent supply mechanism.

[Operation] In addition to the same operation as the operation of the first aspect, the following operation can be performed.

The gas from the heating gas discharge portion of the pyrolysis drum is neutralized with a neutralizing agent from a neutralizing agent supply mechanism provided in the gas recovery passage, and dust is removed from the gas with a bag filter, and then the gas is removed. Supply to the mixer.

[Effect] Therefore, in addition to the same effect as the effect according to the first aspect, the corrosion of the heating gas supply unit and the heating pipe of the pyrolysis drum can be further suppressed, In addition, it was possible to provide a thermal decomposition facility capable of removing dust at the same time.

The constitution, operation and effect of the invention according to claim 3 are as follows.

[Configuration] In the configuration of the invention according to claim 2, an HCl concentration detector for detecting the HCl concentration of the gas discharged from the bag filter is provided, and the bag is detected based on the detection result of the HCl concentration detector. Control means is provided for controlling the neutralizing agent supply mechanism so that the HCl concentration of the gas from the filter does not exceed the set concentration.

[Operation] In addition to the same operation as the operation according to the second aspect, the following operation can be performed.

HCl of the gas discharged from the bag filter
The concentration is detected with an HCl concentration detector. And for example HC
When the l concentration is high, the control means controls the neutralizing agent supply mechanism to increase the supply amount of the neutralizing agent so that the HCl concentration of the gas from the bag filter does not exceed the set concentration.

[Effects] Therefore, in addition to the same effects as the effects according to the second aspect, it is possible to further suppress the corrosion of the heating gas supply unit and the heating pipe of the pyrolysis drum. We were able to provide a disassembly facility.

The constitution, operation and effect of the invention according to claim 4 are as follows.

[Structure] In the structure according to the first aspect of the present invention, the gas treatment device is composed of a neutralizer packing tower.

[Operation] In addition to the same operation as the operation according to the first aspect, the following operation can be achieved.

The gas from the heated gas discharge portion of the pyrolysis drum is neutralized by a neutralizer packed tower provided in the gas recovery passage, and dust is removed from the gas before being supplied to the gas mixer.

The packing which has undergone the neutralization reaction is continuously or intermittently withdrawn from the lower part of the column, and the unreacted packing is supplied from the upper part of the column.

[Effect] Therefore, in addition to the same effect as the effect according to the first aspect, the heat that can further suppress the corrosion of the heating gas supply unit and the heating pipe of the thermal decomposition drum can be obtained. We were able to provide a disassembly facility.

The structure, operation, and effect of the invention according to claim 5 are as follows.

[Structure] In the structure of the present invention according to any one of claims 1, 2, 3, and 4, the neutralizing agent is sodium bicarbonate.

[Operation] In addition to the same operation as the operation according to any one of claims 1, 2, 3 and 4, the following operation can be performed.

In this type of thermal decomposition equipment, the temperature of the gas discharged from the heating gas discharge part of the thermal decomposition drum is generally about 320 ° C. According to the structure of claim 5, the neutralizing agent is used. The temperature of the gas is 32 because it is baking soda (NaHCO ₃ ).
Even at about 0 ° C, HCl can be effectively removed.

[Effects] Therefore, it becomes easier to obtain the same effects as the effects of the configuration according to any one of claims 1, 2, 3, and 4.

The structure, operation and effect of the invention according to claim 6 are as follows.

[Structure] In the structure of the invention according to any one of claims 1, 2, 3, 4, and 5, the heating gas first
In the supply means, a damper is provided in the pyrolysis gas pipe upstream of the pyrolysis gas combustor, and a combustion mechanism for burning fossil fuel is provided in the pyrolysis gas combustor.

[Operation] In addition to the same operation as the operation according to any one of claims 1, 2, 3, 4, and 5, the following operation can be performed.

When the operation of the pyrolysis drum is started, the damper of the pyrolysis gas pipeline on the upstream side of the pyrolysis gas combustor is closed, and the combustion mechanism burns fossil fuel such as kerosene to generate heated gas. . Then, this heating gas is supplied to the heating gas receiving portion of the pyrolysis drum.

When the pyrolysis gas and the pyrolysis residue are discharged from the pyrolysis drum, the damper is gradually opened,
The heating gas second supply means is also switched to the gas supply state side, and a predetermined amount of the pyrolysis gas from the pyrolysis gas is introduced into the pyrolysis gas combustor and burned.

In this way, while gradually increasing the amount of pyrolysis gas burned in the pyrolysis gas combustor,
The amount of fossil fuel burned by the heating gas first supply means is gradually reduced.

As described above, since the pyrolysis gas combustor of the heating gas second supply means is also used as a part of the heating gas first supply means, it is possible to avoid increasing the number of parts of the heating gas supply section. can do.

[Effects] Therefore, claims 1, 2, 3, 4,
In addition to the effect similar to the effect of any one of the configurations of No. 5, the structure can be simplified.

[0050]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a pyrolysis gasification and melting plant which is a treatment plant for general waste such as household waste and industrial waste such as car shredder dust and electric appliances.

This pyrolysis gasification and melting plant comprises a pretreatment facility 1, a pyrolysis facility 2, a pyrolysis residue sorting facility 3, a high temperature combustion melting facility 4, a boiler power generation facility 5, and an exhaust gas treatment facility 6.

[Pretreatment Facility 1] The waste stored in the waste pit 7 is crushed by a crusher, and the crushed waste is sent to the thermal decomposition facility 2 by a transporting device or the like.

[Pyrolysis facility 2] As shown in FIGS. 1 and 2, the waste from the waste pit 7 is conveyed and supplied to the pyrolysis drum 12, and the pyrolysis drum 1 is supplied from the heating gas supply unit 102.
Supply heating gas to 2.

Then, while indirectly heating the waste with this heating gas, the waste is pyrolyzed into a pyrolysis gas and a pyrolysis residue at about 450 ° C. in an oxygen-free or low-oxygen atmosphere,
The pyrolysis gas is sent to the high-temperature combustion melting furnace 13 described later, and the pyrolysis residue is sent to the pyrolysis residue sorting facility 3. The structure of the equipment 2 will be described in detail later.

[Pyrolysis residue selection equipment 3] Pyrolysis drum 1
The thermal decomposition residue from No. 2 is sent to the bucket conveyor 55 side via the vibration feeder 70 and the cooling vibration conveyor 14. Then, the thermal decomposition residue from the bucket conveyor 55 is sent to the thermal decomposition residue sorting apparatus 91 via the vibration conveyor 59 for sealing.

The pyrolysis residue after the iron / aluminum and the like has been sorted by the pyrolysis residue sorting device 91 is crushed (the crushed product is hereinafter referred to as "carbon residue"). The carbon residue is sent to the carbon residue silo 61, and the carbon residue silo 6
The carbon residue in 1 is blown into the high temperature combustion melting furnace 13 from the furnace top side. Further, the iron sorted by a magnetic separator (not shown) is collected in the iron container 96, and the aluminum sorted by an aluminum sorter (not shown) is collected in the aluminum container 97.
To collect.

[High-Temperature Combustion and Melting Facility 4] Pyrolysis gas, carbon residue, and dust collection dust are blown into the high-temperature combustion and melting furnace 13 from the furnace top side to swirl and combust them. The incinerated ash and dust collected will be melted and continuously discharged from the bottom of the furnace.

[Boiler power generation equipment 5] Exhaust gas is cooled in the boiler radiation zone, and is brought to a uniform temperature in the evaporation tube group, and then sent to the superheated steam tube group. The boiler 18 recovers heat from the steam, and the turbine / generator (not shown) recovers it as electricity.

[Exhaust Gas Treatment Equipment 6] Exhaust gas is processed in the gas cooling chamber 21, the first bag filter 17, the second bag filter 22 and the like and exhausted from the chimney 25.

Next, the thermal decomposition equipment 2 will be described.

<Structure of Thermal Decomposition Drum 12> As shown in FIG. 2, the thermal decomposition drum 12 has a horizontal type heat transfer mechanism for the screw conveyor 10 that receives and conveys the waste from the waste pit 7 into the conveyor case 11. Disassembly drum body 27
(Hereinafter, simply referred to as "drum body 27") is inserted from one end side in the axial direction in a state along the axial direction, and a plurality of gases for heating waste gas from the heating gas supply unit 102 are circulated. The heating tube 28 is constructed so as to extend along the longitudinal direction of the drum main body 27 across the partition wall 36 on one end side in the axial direction and the partition wall 37 on the other end side in the hollow of the drum main body 27.

A heating gas receiving portion 29 and a pyrolysis gas / pyrolysis residue discharging portion 31 are provided on the other end side of the drum body 27 in the axial direction, and one end side of the drum body 27 in the axial direction is heated. A gas discharge part 30 is provided.

From the partition wall 37 on the other end side in the axial direction of the drum body 27, the residue discharge pipe 3 having a diameter smaller than that of the drum body 27.
8 extends coaxially with the drum body 27 on the lower side in the transport direction. A residue feed screw 101 is provided on the inner peripheral surface side of the residue discharge pipe 38.

The heating gas receiving portion 29 is such that the heating gas receiving case 40 having the heating gas receiving port 39 surrounds the middle portion of the residue discharge pipe 38 in the longitudinal direction and allows the drum body 27 to rotate. It is configured to be supported by the support base 35.

The pyrolysis gas / pyrolysis residue discharge part 31
Is constructed by providing a pyrolysis gas / pyrolysis residue discharge case 45 in a state of covering the discharge port of the residue discharge pipe 38. The pyrolysis gas is discharged from the outlet 46 and sent to the high temperature combustion melting furnace 13, and the pyrolysis residue is discharged from the pyrolysis residue discharge port 47 on the lower end side of the pyrolysis gas / pyrolysis residue discharge case 45 to generate the pyrolysis residue. It is sent to the sorting equipment 3.

The pyrolysis gas is attracted by the attraction fan 130 (see FIG. 1) on the upstream side of the chimney 25 in the exhaust gas treatment facility 6.

The heating gas exhausting section 30 encloses the heating gas exhausting case 43 having the heating gas exhausting port 42 so as to surround the conveyor case portion extending over a predetermined length of the screw conveyor 10 and rotating the drum body 27. It is configured to be supported by the support base 35 in a permitted state.

<Structure of heating gas supply unit 102> As shown in FIG. 2, the heating gas supply unit 102 includes a heating gas first supply means 103 for starting operation and a heating gas second unit for operation after the operation starts. The supply means 104 is provided so as to be switchable between the heating gas supply state and the heating gas non-supply state.

<Structure of the heating gas second supply means 104> The heating gas second supply means 104 will be described. The pyrolysis gas / pyrolysis residue discharge case 4 of the pyrolysis drum 12 is described.
5 from the pyrolysis gas pipeline 108 for guiding the pyrolysis gas from 5 to the high-temperature combustion melting furnace 13 through the pyrolysis gas branch pipeline 109.
Is branched.

Then, the pyrolysis gas combustion furnace 110 for burning the pyrolysis gas introduced into the pyrolysis gas branch pipe 109 (that is, a predetermined amount of the pyrolysis gas from the pyrolysis drum 12) is burned. (Corresponding to a pyrolysis gas combustor), and an air supply device 1 for the pyrolysis gas combustion furnace 110
24 is provided.

The air supply device 124 is constructed by providing the combustor pushing fan 121 and the pushing air heater 123 in the air supply line 122.

The gas discharged from the heating gas discharge case 43 of the pyrolysis drum 12 and recovered on the gas recovery passage 105 side is mixed with the combustion exhaust gas from the pyrolysis gas combustion furnace 110 to generate heating gas. A gas mixer 111 is provided, and the heating gas discharge case 43 is provided in the gas recovery path 105.
A neutralizing agent supply mechanism 113 (corresponding to a gas neutralization processing device) for neutralizing the gas from is provided, and a bag filter 114 is provided in the gas recovery path 105 between the gas mixer 111 and the neutralizing agent supply mechanism 113. There is.

The gas from the heating gas exhaust case 43 is collected by the recovery fan 116 provided in the gas recovery passage 105 between the gas mixer 111 and the bag filter 114.
Install on the 05 side.

The gas recovery passage 105 is provided with the bag filter 11
4 is branched on the upstream side, and a predetermined amount of gas introduced into the gas recovery passageway 105 side is supplied to the inlet of the boiler 18 through the branch pipe passage 119 by the exhaust fan 120.

The neutralizing agent from the neutralizing agent supply mechanism 113 for the gas from the heated gas discharge case 43 is baking soda. The neutralizing agent supply mechanism 113 is used in the baking soda storage tank 12
6 and baking soda supply drive unit 128.

<Structure of the heating gas first supply means 103> In order to configure the heating gas first supply means 103, a damper 107 is provided in the pyrolysis gas pipeline 109 on the upstream side of the pyrolysis gas combustion furnace 110 to generate heat. A burner 106 (corresponding to a combustion mechanism) for burning kerosene is provided in the cracked gas combustion furnace 110.

That is, when the operation of the pyrolysis drum 12 is started, the damper 107 is closed and the pyrolysis gas combustion furnace 110 is closed.
The kerosene is burned by the burner 106 while the air is being supplied by the air supply device 124 to the heating gas collected by the collecting fan and mixed by the mixer to generate the heating gas. Then, this heating gas is supplied to the heating gas receiving case 40 of the pyrolysis drum 12.

<Structure of Control System for Heating Gas First Supply Means 103 and Heating Gas Second Supply Means 104> [1] Exhaust gas temperature detector 134 for detecting the temperature of the gas discharged from the heating gas discharge case 43. And a recovery fan controller 135 for controlling the recovery fan 116 based on the detection result of the exhaust gas temperature detector 134.

[2] HCl concentration detector 12 for detecting the HCl concentration of the gas discharged from the bag filter 114.
9, and controls the baking soda supply drive unit 128 (control so that the HCl concentration of the gas from the bag filter 114 does not exceed the set concentration based on the detection result of the HCl concentration detector 129). (Corresponding to the means) is provided.

[3] Heating gas temperature detector 13 for detecting the temperature of the heating gas supplied to the heating gas receiving case 40.
1 is provided, and an exhaust fan controller 132 that controls the electric motor 133 of the exhaust fan 120 based on the detection result of the heating gas temperature detector 131 is provided.

With the above structure, the thermal decomposition equipment 2 is operated as follows.

1) When the operation of the pyrolysis drum 12 is started, the damper 107 of the pyrolysis gas pipeline 109 on the upstream side of the pyrolysis gas combustion furnace 110 is closed, and the pyrolysis gas combustion furnace 110 is closed.
Kerosene is burned by a burner 106 provided in the above to generate heating gas. Then, this heating gas is supplied to the heating gas receiving case 40 of the pyrolysis drum.

The heating gas flowing through the heating pipe 28 of the thermal decomposition drum 12 and discharged from the heating gas discharge case 43 of the thermal decomposition drum 12 is recovered to the gas mixer 111 side and heated again by the burner 106. Return to the heated gas receiving case 40. Excess heating gas from the heating gas discharge case 43 is supplied to the inlet of the boiler 18 through the branch pipe line 119.

2) When the thermal decomposition gas and the thermal decomposition residue are discharged from the thermal decomposition gas / thermal decomposition residue discharge case 45 of the thermal decomposition drum 12, the damper 107 is gradually opened,
A predetermined amount of the pyrolysis gas from the pyrolysis gas / pyrolysis residue discharge case 45 is decomposed into the pyrolysis gas combustion furnace 11
Lead to 0 and burn.

Then, the gas discharged through the heating gas discharge case 43 through the heating pipe 28 of the thermal decomposition drum 12 is recovered to the gas recovery passage 105 side, and the neutralizing agent supply mechanism 113 provided in the gas recovery passage 105. The gas is neutralized with baking soda from the same, dust is removed from the gas by a bag filter 114, and the gas from which the dust is removed is mixed with the gas mixer 111.
Supply to.

The gas mixer 111 mixes the gas with the combustion exhaust gas from the pyrolysis gas combustion furnace 110 to generate a heating gas, which is supplied to the heating gas receiving case 40.

3) When the amount of kerosene burned in the burner 106 is gradually reduced and the amount of pyrolysis gas discharged from the pyrolysis gas / pyrolysis residue discharge case 45 reaches a set amount, the burner 106 is operated. The heating gas is sent to the heating gas receiving case 40 only by the pyrolysis gas combustion furnace 110 and the gas mixer 111. Steady operation starts in this state.

As described above, in the pyrolysis gas combustion furnace 110, only the pyrolysis gas is burned separately from the pyrolysis residue to obtain combustion exhaust gas having a low HCl concentration, and the low HCl concentration is obtained.
Since the combustion gas having a concentration is mixed with the neutralized gas (gas from the heating gas discharge case 43) to generate the heating gas, the HCl concentration in the heating gas supplied to the heating gas receiving case 40 is further lowered. be able to.

In the above 1) to 3), the temperature of the gas discharged from the heating gas discharge case 43 is set to 320 ° C. When the exhaust gas temperature detector 134 detects that the temperature becomes lower than 320 ° C., the recovery fan controller 135 increases the number of revolutions of the recovery fan 116 to increase the gas circulation amount.

The HCl concentration of the gas discharged from the bag filter 114 should not exceed 5 ppm. When the HCl concentration detector 129 detects that the HCl concentration exceeds 5 ppm, the baking soda supply driving unit controller 130 (corresponding to a control means) controls the baking soda supply driving unit 128 so that the gas from the bag filter 114 is released. Increase the supply of baking soda so that the HCl concentration does not exceed 5 ppm.

The temperature of the heating gas supplied to the heating gas receiving case 40 is set to 530.degree. This temperature is 530
When the heating gas temperature detector 131 detects that the temperature becomes lower than 0 ° C., the exhaust fan controller 132 causes the exhaust fan 12 to operate.
The number of revolutions of the electric motor 133 of 0 is increased to increase the supply amount of the pyrolysis gas to the pyrolysis gas combustion furnace 110 to set the temperature to 530 ° C.

(Example) Waste of 2000 Kcal / Kg was treated, and as shown in FIG. 2, the amount G of pyrolysis gas supplied to the gas mixer 111 was 6900 Nm ³ / H and the gas temperature T.
Was set to 320 ° C. so that the HCl concentration H did not exceed 5 ppm and the dust concentration D did not exceed 0.001 g / Nm ³ .

The heating gas supply amount G to the heating gas receiving case 40 of the pyrolysis drum 12 is 8840 Nm ³ /
When H and gas temperature T were set to 530 ° C., HCl concentration H was 50 ppm and dust concentration D was 0.02 g / Nm ^3.
I was able to

When the pyrolysis gas is combusted in the pyrolysis gas combustion furnace 110, the HCl concentration H becomes about 200 ppm, but as described above, in the pyrolysis equipment 2, the HCl of the heating gas to the heating gas receiving case 40 is Concentration H is 1/4 at 50p
could be pm.

FIG. 3 shows the result of an experiment for the effect of HCl concentration on the corrosion weight loss ratio of low alloy steel (STBA24). In FIG. 3, the corrosion weight loss ratio is expressed as a ratio based on the corrosion weight loss (weight loss amount) of a certain material under certain conditions. The weight reduction ratio is 1 when the gas temperature is 500 ° C. and the HCl concentration is 50 ppm. As described above, when only the pyrolysis gas is burned in the pyrolysis gas combustion furnace 110 (that is, the structure without the gas mixer 111), the HCl concentration of the gas is about 200 ppm. According to this structure, since the HCl concentration H can be set to 50 ppm, as can be seen from FIG. 3, the degree of corrosion is one-sixth of that in the above case (only when the pyrolysis gas is burned). It can be a degree.

[Other Embodiments] As shown in FIG. 4, the gas neutralization treatment apparatus may be constituted by a baking soda packed tower 136 (corresponding to a neutralizer packed tower).

The baking soda packed tower 136 is a tower body 137 packed with baking soda, which can neutralize gas and remove dust from the gas.

The neutralizing agent is not limited to sodium bicarbonate, and may be sodium carbonate, for example.

The numerical values raised in the above embodiment are examples and may be different numerical values.

[Brief description of drawings]

FIG. 1 Schematic diagram of pyrolysis gasification and melting plant

FIG. 2 is a schematic vertical sectional front view of a thermal decomposition facility.

FIG. 3 is a diagram showing the effect of HCl concentration on the corrosion weight loss ratio of low alloy steel.

FIG. 4 is a diagram showing another embodiment.

[Explanation of symbols]

12 Pyrolysis drum 29 Heated gas receiving part 30 Heating gas exhaust 102 heating gas supply unit 103 Heating Gas First Supply Means 104 heating gas second supply means 105 gas recovery path 106 Combustion mechanism 107 damper 109 pyrolysis gas pipeline 110 Pyrolysis gas combustor 111 gas mixer 113,136 Gas neutralization processing device 114 Bug Filter 124 HCl concentration detector 130 control means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI F23G 5/027 B09B 3/00 304H 5/16 ZAB 5/20 B01D 53/34 118B 5/46 F23J 15/00 Z F23J 15 / 00 (58) Fields investigated (Int.Cl. ⁷ , DB name) B09B 3/00 B01D 53/40 B01D 53/77 F23G 5/027 F23G 5/16 F23G 5/20 F23G 5/46 F23J 15/00

Claims (6)

(57) [Claims] 1. A pyrolysis drum that indirectly heats waste with a heating gas supplied from a heating gas supply unit to thermally decompose it into a thermal decomposition residue and a thermal decomposition gas, wherein the pre-pyrolysis drum is a heating gas. A pyrolysis facility comprising a receiving part, a heating pipe through which the heating gas is passed, and a heating gas discharge part provided in the pyrolysis drum body, wherein the heating gas supply part is configured to start operation. First heating gas supply means and second heating gas for operation after the start of operation
A supply means is provided so as to be switchable between a heating gas supply state and a heating gas non-supply state, and the heating gas second supply means burns a predetermined amount of the pyrolysis gas from the pyrolysis gas from the pyrolysis drum. A pyrolysis gas combustor is provided to allow the gas discharged from the heating gas discharge part of the pyrolysis drum to be recovered on the gas recovery path side,
A gas mixer for generating the heating gas by mixing with the combustion exhaust gas from the pyrolysis gas combustor is provided, and a gas neutralization processing device for neutralizing the gas from the heating gas discharge part is provided in the gas recovery path. Pyrolysis equipment provided and configured. 2. The gas neutralization processing device comprises a neutralizing agent supply mechanism for supplying a neutralizing agent to the gas recovery passage, and a bag filter is provided between the gas mixer and the neutralizing agent supply mechanism. The thermal decomposition facility according to claim 1, which is provided. 3. An HCl concentration detector for detecting the HCl concentration of the gas discharged from the bag filter is provided,
The heat control device according to claim 2, further comprising control means for controlling the neutralizing agent supply mechanism so that the HCl concentration of the gas from the bag filter does not exceed a set concentration based on the detection result of the Cl concentration detector. Decomposition equipment. 4. The thermal decomposition facility according to claim 1, wherein the gas neutralization treatment device is constituted by a neutralizer packing tower. 5. The method of claim 1, wherein the neutralizing agent is baking soda.
The thermal decomposition equipment according to any one of 3 and 4. 6. In the heating gas first supply means, a damper is provided in the pyrolysis gas pipeline upstream of the pyrolysis gas combustor, and fossil fuel is burned in the pyrolysis gas combustor. A combustion mechanism is provided.
Pyrolysis equipment according to any one of 5.