CN207143176U - A kind of heat accumulating type external heat pressurization pyrolysis of coal device - Google Patents
A kind of heat accumulating type external heat pressurization pyrolysis of coal device Download PDFInfo
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- CN207143176U CN207143176U CN201720492328.9U CN201720492328U CN207143176U CN 207143176 U CN207143176 U CN 207143176U CN 201720492328 U CN201720492328 U CN 201720492328U CN 207143176 U CN207143176 U CN 207143176U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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Abstract
The utility model discloses a kind of heat accumulating type external heat pressurization pyrolysis of coal device, described device includes：Pyrolysis oven, high-temperature flue gas radiant tube group and air burning room.The utility model utilizes the high-temperature flue gas from air burning room, and heat is supplied into pyrolysis oven by high-temperature flue gas radiant tube group, so as to be pyrolyzed to lump coal or fine coal；Gas pressure is 0.1~4.0MPa, and pressurization can reduce the power consumption that follow-up coal gas utilizes process；Coal gas is directly separated with tar and coal tar in carbonization chamber, and gas composition is pure and calorific value is high, and gas-liquid-solid three-phase product yield is high；Go out about 400~800 DEG C of the high-temperature flue gas of pyrolysis oven, 100~200 DEG C are down to by temperature after heat storage, while air themperature raises, thus flue gas waste heat recovery is realized, capacity usage ratio is high.
Description
Technical field
It the utility model is related to pyrolysis of coal technical field, and in particular to a kind of heat accumulating type external heat pressurization pyrolysis of coal device.
Background technology
In short supply with the rise of oil price after the seventies, there occurs new to the various forms of energy by people
Interest, the research about pyrolysis of coal substantially increases.In China, the ground such as Inner Mongol and southwest distributed a large amount of low-disintegration coals, such as
Lignite and jet coal, it can be used as pyrolysis of coal raw material, and then realize sub-prime conversion and the classified utilization of the gas-liquid-solid component of coal.
Pyrolysis of coal is liquefied to coal gasification and burning is respectively provided with highly important meaning, while is also a large amount of low-disintegration coal high-efficient cleanings in China
One of important channel of clean trans-utilization.Pyrolysis of coal process is complex, and it is by coal, moisture, volatile matter content, ash content
The influence of the factors such as content, temperature and pressure.Three kinds of different shapes of gas, liquid, solid of cleaning can be produced by pyrolysis of coal
Product, the above two can be used as chemicals, and the latter's solid-state coal tar can be as the raw material further to gasify.
General pyrolysis of coal R and D work lays particular emphasis on normal pressure, but with pressurized downstream gasification and combustion technology
Development, pressurization pyrolysis of coal technology cause the concern and research of more people.For example, foreign scholar once grinds below 10MPa pressure
Influence of the pressure to pyrolysis weight loss, and the experimental study that Quick-pressing is pyrolyzed in the range of certain pressure are studied carefully.
Within the pyrolytic technique that China generally uses at present based on hot normal pressure lump coal pyrolytic technique.It has the disadvantages that：
Feed coal particle diameter is big, pyrolysis time is long, liquid phase product yield and calorific value are low, coal gas is big etc. using process power consumption.Meanwhile with
The progress of fine coal machinery coal-mining technique, it is difficult to ensure that coal charge size (radius required by interior hot lump coal pyrolytic technique
Coal charge less than 15mm is unsuitable for lump coal pyrolysis).
It would therefore be highly desirable to provide it is a kind of can overcome the shortcomings of above-mentioned pyrolysis of coal technology, while the new of fine coal can also be processed
Moulded coal pyrolysis plant and method.
Utility model content
The purpose of this utility model is to provide a kind of heat accumulating type external heat pressurization pyrolysis of coal device, to solve heat in current
Lump coal pyrolytic technique is unable to the problem of coal charge of the pair radius less than 15mm is pyrolyzed.
To achieve the above object, the utility model discloses following technical scheme：
The utility model discloses a kind of heat accumulating type external heat pressurization pyrolysis of coal device, described device includes：Pyrolysis oven, high temperature
Gas radiation pipe group and air burning room, the pyrolysis oven top is provided with gas exit and is connected with coal gas discharge line, described
High-temperature flue gas radiant tube group is arranged in the inside of the pyrolysis oven, and the upper and lower part of the high-temperature flue gas radiant tube group is set respectively
Gas approach and exhanst gas outlet are equipped with, the air burning room is connected to the gas approach, the flue gas by flue
Outlet is connected with internal the first regenerator and the second regenerator equipped with heat storage by flue and fume reversing valve, and first
Regenerator and the second regenerator are connected to smoke discharge tube road and air burning room.
A kind of above-mentioned heat accumulating type external heat pressurization pyrolysis of coal device, the high-temperature flue gas radiant tube group disclosed in the utility model
Including horizontal radiation pipe group and vertical radiant tube group, the horizontal radiation pipe group is staggeredly connected by more horizontal tubes and formed, described
Horizontal radiation pipe group includes upper level radiant tube group and lower horizontal radiant tube group, the upper level radiant tube group and described
The side of lower horizontal radiant tube group is respectively arranged with gas approach and exhanst gas outlet, and the vertical radiant tube group is by more standpipes
Formation arranged in parallel, the top and bottom of every standpipe are connected with upper level radiant tube group and lower horizontal radiant tube group respectively
Connect.
Above-mentioned a kind of heat accumulating type external heat pressurization pyrolysis of coal device disclosed in the utility model, it is the more horizontal tubes, described
Gap between more standpipes and the housing of pyrolysis oven forms carbonization chamber.
A kind of above-mentioned heat accumulating type external heat pressurization pyrolysis of coal device, the pyrolysis oven hold for pressure disclosed in the utility model
Device, its pressure are 0.1~4.0MPa.
A kind of above-mentioned heat accumulating type external heat pressurization pyrolysis of coal device, the top arrangement of the pyrolysis oven disclosed in the utility model
There are multiple coal lock hoppers and coal bunker, the multiple coal lock hopper top is respectively connecting to multiple coal outlets of the coal bunker bottom, described
Multiple coal lock hopper bottoms are connected to the top of the pyrolysis oven, and a throwing coal is equipped between each coal lock hopper and each coal outlet
Starlike valve, wherein, the pressure of each coal lock hopper is 0.1~4.0MPa.
A kind of above-mentioned heat accumulating type external heat pressurization pyrolysis of coal device, the arranged beneath of the pyrolysis oven disclosed in the utility model
There are a multiple burnt lock hoppers and a coal tar collecting chamber, the top of the multiple burnt lock hopper is respectively connecting to more below the pyrolysis oven
Individual coke outlet, the bottom of the multiple burnt lock hopper are connected to the coal tar collecting chamber, each between burnt lock hopper and each coke outlet
A coal tar Starlike valve is equipped with, wherein, the pressure of each burnt lock hopper is 0.1~4.0MPa.
A kind of above-mentioned heat accumulating type external heat pressurization pyrolysis of coal device, first regenerator and second disclosed in the utility model
Regenerator is respectively connecting to air intake pipe, and air reversing valve, the air burning are provided with the air intake pipe
Room is also associated with fuel gas admission line.
The invention also discloses a kind of heat accumulating type external heat pressurization pyrolysis of coal method, methods described includes：Fine coal or block
Coal is put into pyrolysis oven by coal bunker, throwing coal Starlike valve, coal lock hopper；Fine coal is in the carbonization chamber of pyrolysis oven, in high-temperature flue gas spoke
Penetrate under the influence of the high temperature of pipe group, pyrolytic reaction generation coal gas, tar and coal tar occurs；Coal gas is through gas exit and coal gas discharge pipe
Leave pyrolysis oven in road；The coke outlet of tar and coal tar through bottom of carbonization chamber, coal tar Starlike valve, burnt lock hopper enter coal tar collecting chamber；
Wherein, air is through air intake pipe, air reversing valve, the first regenerator and the second regenerator air inlet combustion chamber, with combustion
Combustion reaction occurs in air burning room for material gas, produces a large amount of 400~800 DEG C of high-temperature flue gas, and high-temperature flue gas passes through pyrolysis
Gas approach on stove enters upper level radiant tube group, then descending by vertical radiant tube group, is radiated into lower horizontal
Pipe group, pyrolysis oven is left finally by exhanst gas outlet.
A kind of above-mentioned heat accumulating type external heat pressurization pyrolysis of coal method, the high-temperature flue gas go out from flue gas disclosed in the utility model
Enter the first regenerator or the second regenerator by fume reversing valve after mouthful discharge, regenerator is absorbed heat, leave the first regenerator or
The temperature of the high-temperature flue gas of second regenerator is reduced to 100~200 DEG C.
A kind of above-mentioned heat accumulating type external heat pressurization pyrolysis of coal method, first regenerator and second disclosed in the utility model
Heat storage in regenerator carries out periodicity heat release and heat absorption successively by fume reversing valve, while air intake pipe passes through sky
The periodically commutation of gas reversal valve is respectively that first regenerator and the second regenerator are put into air, through the first regenerator or second
The commutation cycle of air burning room, the fume reversing valve and the air reversing valve is put into after heat storage heating in regenerator
Identical, each commutation cycle is 30~90s, wherein, when heat storage is put into height by fume reversing valve in first regenerator
When warm flue gas is absorbed heat, second regenerator is put into air by air reversing valve, the accumulation of heat in second regenerator
Body carries out heat release to the air being put into, when first regenerator is put into air, first regenerator by air reversing valve
When interior heat storage carries out heat release to the air being put into, heat storage is put into high temperature by fume reversing valve in second regenerator
Flue gas is absorbed heat.
The utility model has the following advantages that：
The utility model utilizes the high-temperature flue gas from air burning room, is provided heat by high-temperature flue gas radiant tube group
To pyrolysis oven, so as to be pyrolyzed to lump coal or fine coal；Gas pressure is 0.1~4.0MPa, and pressurization can reduce follow-up coal gas
Utilize the power consumption of process；Coal gas is directly separated with tar and coal tar in carbonization chamber, and gas composition is pure and calorific value is high, gas-liquid-solid three
Phase product yield is high；Go out about 400~800 DEG C of the high-temperature flue gas of pyrolysis oven, 100~200 DEG C be down to by temperature after heat storage,
Air themperature rise simultaneously, thus flue gas waste heat recovery is realized, capacity usage ratio is high.
Brief description of the drawings
Fig. 1 is a kind of sectional view of heat accumulating type external heat pressurization pyrolysis of coal device disclosed in the utility model；
Fig. 2 is a kind of top view of the pyrolysis oven of heat accumulating type external heat pressurization pyrolysis of coal device disclosed in the utility model.
Reference：
01：Pyrolysis oven；02：Air burning room；03：Gas exit；04：Coal gas discharge line；05：Vertical radiant tube group；
06：Upper level radiant tube group；07：Lower horizontal radiant tube group；08：Gas approach, 09：Exhanst gas outlet；10：Flue gas commutates
Valve；11：First regenerator；12：Second regenerator；13：Smoke discharge tube road；14：Air intake pipe；15：Air reversing valve；
16：Fuel gas admission line；17：Carbonization chamber；18：Coal lock hopper；19：Coal bunker；20：Coal outlet；21：Throw coal Starlike valve；22：Jiao Suo
Bucket；23：Coal tar collecting chamber； 24：Coke outlet；25：Coal tar Starlike valve.
Embodiment
Following examples are used to illustrate the utility model, but are not limited to the scope of the utility model.
Embodiment 1
With reference to figure 1 and Fig. 2, a kind of heat accumulating type external heat pressurization pyrolysis of coal device disclosed in the present embodiment includes：Pyrolysis oven
01st, high-temperature flue gas radiant tube group and air burning room 02, the top of pyrolysis oven 01 are provided with gas exit 03 and are connected with coal gas discharge
Pipeline 04, high-temperature flue gas radiant tube group are arranged in the inside of pyrolysis oven 01, and high-temperature flue gas radiant tube group includes horizontal radiation pipe group
With vertical radiant tube group 05, horizontal radiation pipe group is staggeredly connected by more horizontal tubes and formed, and horizontal radiation pipe group includes upper water
The side of flat radiant tube group 06 and lower horizontal radiant tube group 07, upper level radiant tube group 06 and lower horizontal radiant tube group 07
Gas approach 08 and exhanst gas outlet 09 are respectively arranged with, vertical radiant tube group 05 is formed by more standpipes are arranged in parallel, and every vertical
The top and bottom of pipe are connected with upper level radiant tube group 06 and lower horizontal radiant tube group 07 respectively, air burning room
02 is connected to gas approach 08 by flue, and exhanst gas outlet 09 is connected with inside by flue and fume reversing valve 10
The first regenerator 11 and the second regenerator 12 equipped with heat storage, the first regenerator 11 and the second regenerator 12 are connected to flue gas
Discharge line 13 and air burning room 02, the first regenerator 11 and the second regenerator 12 are respectively connecting to air intake pipe 14,
Air reversing valve 15 is provided with air intake pipe 14, air burning room 02 is also associated with fuel gas admission line 16.
In addition, with reference to figure 1, the housing of pyrolysis oven 01 is mainly made up of heat insulating material for external, and pyrolysis oven 01 is pressure vessel, even
Be connected to pressure providing device, make its pressure be 0.1~4.0MPa, the housings of more horizontal tubes, more standpipes and pyrolysis oven 01 it
Between gap form carbonization chamber 17, the lump coal of the enough radiuses of clearance space of carbonization chamber 17 less than 15mm and fine coal pass through and heat
Solution；The top of pyrolysis oven 01 is disposed with multiple coal lock hoppers 18 and coal bunker 19, and multiple tops of coal lock hopper 18 are respectively connecting to coal bunker 19
Multiple coal outlets 20 of bottom, multiple bottoms of coal lock hopper 19 are connected to the top of pyrolysis oven 01, and each coal lock hopper 19 is with each going out
One is equipped between coal mouth 20 and throws coal Starlike valve 21, wherein, the pressure that the pressure of each coal lock hopper 19 passes through its upper and lower part
The control of power valve is 0.1~4.0MPa, and the arranged beneath of pyrolysis oven 01 has multiple burnt lock hoppers 22 and a coal tar collecting chamber 23, more
The top of individual burnt lock hopper 22 is respectively connecting to multiple coke outlets 24 of the lower section of pyrolysis oven 01, the bottom connection of multiple burnt lock hoppers 22
To coal tar collecting chamber 23, a coal tar Starlike valve 25 is equipped between each burnt lock hopper 22 and each coke outlet 24, wherein, each
The pressure valve control that the pressure of burnt lock hopper 22 passes through its upper and lower part is 0.1~4.0MPa.
Wherein, the first regenerator and the interior heat storage made of heat-storing material of the second regenerator form, and heat storage can be
Spherical, short cylindrical shape, short hollow cylindrical, abacus pearl, jujube shape, cellular and sheet etc., its material be corundum, mullite,
High alumina, ceramics and heat resisting steel etc..
A kind of heat accumulating type external heat pressurization pyrolysis of coal method disclosed in the present embodiment includes：Fine coal or lump coal pass through coal bunker
19th, coal Starlike valve 21 is thrown, coal lock hopper 18 is put into pyrolysis oven 01；Fine coal is in the carbonization chamber 17 of pyrolysis oven 01, in high-temperature flue gas
Under the influence of the high temperature of radiant tube group, pyrolytic reaction generation coal gas, tar and coal tar occurs；Coal gas is arranged through gas exit 03 and coal gas
Go out pipeline 04 and leave pyrolysis oven 01；The coke outlet 24 of tar and coal tar through the bottom of carbonization chamber 17, coal tar Starlike valve 25, burnt lock hopper 22
Into coal tar collecting chamber 23, then tar and semicoke are separated into through the processing of follow-up workshop section；Wherein, air is through air intake pipe
14th, air reversing valve 15, the first regenerator 11 and the air inlet combustion chamber 02 of the second regenerator 12, with fuel gas in air burning
Combustion reaction occurs in room 02, produces a large amount of 400~800 DEG C of high-temperature flue gas, high-temperature flue gas passes through the flue gas on pyrolysis oven 01
Import 08 enters upper level radiant tube group 06, then descending by vertical radiant tube group 05, into lower horizontal radiant tube group
07, leave pyrolysis oven 01 finally by exhanst gas outlet 09.
Further, high-temperature flue gas from exhanst gas outlet 09 discharge after by fume reversing valve 10 enter the first regenerator 11 or
Second regenerator 12, after making regenerator accumulation of heat, high-temperature flue gas leaves the first regenerator 11 or the second by smoke discharge tube road 13
Regenerator 12, the temperature for leaving the high-temperature flue gas of the first regenerator 11 or the second regenerator 12 are reduced to 100~200 DEG C.First
Heat storage in the regenerator 12 of regenerator 11 and second carries out periodicity heat release and heat absorption successively by fume reversing valve 10, simultaneously
It is respectively that the first regenerator 11 and the second regenerator 12 are put into that air intake pipe 14 is periodically commutated by air reversing valve 15
Air, it is put into air burning room 02, fume reversing valve after the heat storage heating in the first regenerator 11 or the second regenerator 12
10 is identical with the commutation cycle of air reversing valve 15, and each commutation cycle is 30~90s, wherein, stored when in the first regenerator 11
When hot body is put into high-temperature flue gas by fume reversing valve 10 and absorbed heat, the second regenerator 12 is put into sky by air reversing valve 15
Gas, the heat storage in the second regenerator 12 carries out heat release to the air being put into, when the first regenerator 11 passes through air reversing valve 15
It is put into air, when the heat storage in the first regenerator 11 carries out heat release to the air being put into, heat storage leads in the second regenerator 12
Cross fume reversing valve 10 and be put into high-temperature flue gas and absorbed heat, when heat storage passes through cigarette in the first regenerator 11 or the second regenerator 12
When gas reversal valve 10 is put into high-temperature flue gas and absorbed heat, flue gas intake valve in the first regenerator 11 or the second regenerator 12 and
Fume emission valve is opened, and the first regenerator 11 or air inlet valve in the second regenerator 12 and air bleeder valve are turned off, instead
It, when heat storage is put into air, the first regenerator 11 by air reversing valve 15 in the first regenerator 11 or the second regenerator 12
Or the second heat storage in regenerator 12 is to the air being put into when carrying out heat release, in the first regenerator 11 or the second regenerator 12
Flue gas intake valve and fume emission valve are closed, the first regenerator 11 or the air inlet valve in the second regenerator 12 and air discharge
Valve is opened.
Above-mentioned heat accumulating type external heat pressurization pyrolysis of coal method can carry out lump coal and pulverized coal pyrolysis under 0.1~4.0MPa pressure,
Feed coal completely cuts off with high-temperature flue gas, controls the temperature of carbonization chamber 17 to exist by high-temperature flue gas radiant tube group radiations heat energy by high-temperature flue gas
400~800 DEG C.Product gas composition is pure and calorific value is high, and follow-up coal gas is low in energy consumption using process, tar and coal tar is easy to and coal
Qi leel from.After high-temperature flue gas leaves pyrolysis oven 01, first discharged again with air heat-exchange, air is after heat-exchange temperature raises, with fuel
Gas reactive combustion in air burning room.
Although above having made detailed description to the utility model with generality explanation and specific embodiment,
On the basis of the utility model, it can be made some modifications or improvements, this is apparent to those skilled in the art
's.Therefore, the these modifications or improvements on the basis of without departing from the utility model spirit, belonging to the utility model will
Seek the scope of protection.
Claims (7)
- The pyrolysis of coal device 1. a kind of heat accumulating type external heat pressurizes, it is characterised in that described device includes：Pyrolysis oven, high-temperature flue gas spoke Pipe group and air burning room are penetrated, the pyrolysis oven top is provided with gas exit and is connected with coal gas discharge line, the high temperature cigarette Gas radiant tube group is arranged in the inside of the pyrolysis oven, and the upper and lower part of the high-temperature flue gas radiant tube group is respectively arranged with cigarette Gas import and exhanst gas outlet, the air burning room are connected to the gas approach by flue, and the exhanst gas outlet leads to Cross flue and fume reversing valve is connected with internal the first regenerator and the second regenerator that heat storage is housed, the first regenerator Smoke discharge tube road and air burning room are connected to the second regenerator.
- A kind of 2. heat accumulating type external heat pressurization pyrolysis of coal device as claimed in claim 1, it is characterised in that the high-temperature flue gas spoke Penetrating pipe group includes horizontal radiation pipe group and vertical radiant tube group, and the horizontal radiation pipe group staggeredly connects shape by more horizontal tubes Into the horizontal radiation pipe group includes upper level radiant tube group and lower horizontal radiant tube group, the upper level radiant tube The side of group and the lower horizontal radiant tube group is respectively arranged with gas approach and exhanst gas outlet, the vertical radiant tube group by More standpipe formation arranged in parallel, the top and bottom of every standpipe radiate with upper level radiant tube group and lower horizontal respectively Pipe group is connected.
- A kind of 3. heat accumulating type external heat pressurization pyrolysis of coal device as claimed in claim 2, it is characterised in that the more levels Gap between the housing of pipe, the more standpipes and pyrolysis oven forms carbonization chamber.
- 4. a kind of heat accumulating type external heat pressurization pyrolysis of coal device as claimed in claim 1, it is characterised in that the pyrolysis oven is pressure Force container, its pressure are 0.1~4.0MPa.
- A kind of 5. heat accumulating type external heat pressurization pyrolysis of coal device as claimed in claim 1, it is characterised in that the pyrolysis oven it is upper Side is disposed with multiple coal lock hoppers and coal bunker, and the multiple coal lock hopper top is respectively connecting to the multiple of coal bunker bottom and produced coal Mouthful, the multiple coal lock hopper bottom is connected to the top of the pyrolysis oven, is equipped between each coal lock hopper and each coal outlet One throwing coal Starlike valve, wherein, the pressure of each coal lock hopper is 0.1~4.0MPa.
- 6. a kind of heat accumulating type external heat pressurization pyrolysis of coal device as claimed in claim 5, it is characterised in that under the pyrolysis oven Side is disposed with multiple burnt lock hoppers and a coal tar collecting chamber, and the top of the multiple burnt lock hopper is respectively connecting under the pyrolysis oven Multiple coke outlets of side, the bottom of the multiple burnt lock hopper are connected to the coal tar collecting chamber, and each burnt lock hopper is with each the discharging of the coke A coal tar Starlike valve is equipped between mouthful, wherein, the pressure of each burnt lock hopper is 0.1~4.0MPa.
- A kind of 7. heat accumulating type external heat pressurization pyrolysis of coal device as claimed in claim 1, it is characterised in that first regenerator and Second regenerator is respectively connecting to air intake pipe, and air reversing valve, the air are provided with the air intake pipe Combustion chamber is also associated with fuel gas admission line.
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| CN201720492328.9U CN207143176U (en) | 2017-05-05 | 2017-05-05 | A kind of heat accumulating type external heat pressurization pyrolysis of coal device |
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| CN201720492328.9U CN207143176U (en) | 2017-05-05 | 2017-05-05 | A kind of heat accumulating type external heat pressurization pyrolysis of coal device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106995706A (en) * | 2017-05-05 | 2017-08-01 | 北京清创晋华科技有限公司 | A kind of heat accumulating type external heat pressurization pyrolysis of coal device and method |
| CN108531201A (en) * | 2018-04-08 | 2018-09-14 | 王树宽 | External-heat pyrolysis oven |
-
2017
- 2017-05-05 CN CN201720492328.9U patent/CN207143176U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106995706A (en) * | 2017-05-05 | 2017-08-01 | 北京清创晋华科技有限公司 | A kind of heat accumulating type external heat pressurization pyrolysis of coal device and method |
| CN108531201A (en) * | 2018-04-08 | 2018-09-14 | 王树宽 | External-heat pyrolysis oven |
| CN108531201B (en) * | 2018-04-08 | 2020-06-26 | 王树宽 | External heating type pyrolysis furnace |
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