CN107367168A - A kind of gas-fired heater and its method for heating titanium and titanium alloy ingot casting - Google Patents
A kind of gas-fired heater and its method for heating titanium and titanium alloy ingot casting Download PDFInfo
- Publication number
- CN107367168A CN107367168A CN201710806093.0A CN201710806093A CN107367168A CN 107367168 A CN107367168 A CN 107367168A CN 201710806093 A CN201710806093 A CN 201710806093A CN 107367168 A CN107367168 A CN 107367168A
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- CN
- China
- Prior art keywords
- heating furnace
- burner hearth
- preheating
- gas
- titanium
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/12—Travelling or movable supports or containers for the charge
- F27D3/123—Furnace cars
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Tunnel Furnaces (AREA)
Abstract
The invention discloses a kind of gas-fired heater, including heated by natural gas device, heating furnace and preheating burner hearth, heated by natural gas device is connected with heating furnace, one end of heating furnace is provided with the first dodge gate, the other end of heating furnace is connected with preheating one end of burner hearth, the other end of preheating burner hearth is provided with the 3rd dodge gate, and the second dodge gate is provided between heating furnace and preheating burner hearth；Flue is provided with preheating burner hearth, the port of flue one end connects with heating furnace, and heating furnace and preheating burner hearth bottom are provided with track, coordinate on track and are provided with the chassis with transmission device.The device of the present invention utilizes the waste heat that flue gas is discharged in gas furnace heating process, by setting up preheating burner hearth, rationally designing silica brick heat conduction flue and useless cigarette tapping equipment, in the case where not increasing fuel, using reasonable, feasible heating technology controlling and process, to complete the warm to ingot casting.The invention also discloses a kind of method of gas heating stove heat titanium and titanium alloy ingot casting.
Description
Technical field
The present invention relates to titanium or titanium alloy firing equipment technical field, and in particular to a kind of gas-fired heater, the present invention is also
It is related to the method for the gas heating stove heat titanium and titanium alloy ingot casting.
Background technology
Titanium is a kind of important structural metal to grow up the 1950s, and titanium or titanium alloy has light weight, low
The excellent combination property such as density, Gao Biqiang, corrosion-resistant, high temperature resistant, nonmagnetic, bio-compatible, it is widely used in aviation, boat
My god, naval vessel, weapons, oil, chemical industry, the field such as medical treatment.But the more difficult control of titanium and its alloy work process, processing technology are complicated,
First titanium or titanium alloy due to own physical characteristic limit, thermal conductivity factor is very low, λ=15.24W/ (m.K), about the 1/5 of iron,
The 1/14 of aluminium, therefore, in titanium and titanium alloy ingot casting heating process, the heat time is longer, and thermal energy consumption is larger；Second, due to titanium
And titanium alloy thermal conductivity factor is low, to avoid producing larger internal stress in heating process, titanium and titanium alloy ingot casting is in heating process
In, it is required to carry out long period preheating to ingot casting at 700~800 DEG C；Third, titanium and titanium alloy ingot casting cogging heating process
In, heating-up temperature height (1000~1200 DEG C), and due to filling, coming out of the stove repeatedly, in use, resistance wire damage is frequently for resistance furnace
It is numerous.
The content of the invention
It is an object of the invention to provide a kind of gas-fired heater, and the preheating to ingot casting is completed by setting up preheating burner hearth,
It instead of the warm that titanium and titanium alloy ingot casting uses natural gas in heating furnace.
It is a further object to provide a kind of method of gas heating stove heat titanium and titanium alloy ingot casting.
The technical solution adopted in the present invention is a kind of gas-fired heater, including heated by natural gas device, heating furnace and
Burner hearth is preheated, heated by natural gas device is connected with heating furnace, and one end of heating furnace is provided with the first dodge gate, heating furnace
The other end be connected with preheating one end of burner hearth, the other end for preheating burner hearth is provided with the 3rd dodge gate, and heating furnace is with preheating
The second dodge gate is provided between burner hearth；Flue is provided with preheating burner hearth, the port of flue one end connects with heating furnace, heating furnace
Thorax and preheating burner hearth bottom are provided with track, coordinate on track and are provided with the chassis with transmission device.
The features of the present invention also resides in：
Heating furnace includes heating furnace body, and heating furnace lining is provided with heating furnace body.
Preheating burner hearth includes preheating body of heater, preheating furnace lining is provided with preheating furnace body, flue is arranged on the inwall of preheating furnace lining
On.
Preheating and be additionally provided with fume extractor on the preheating body of heater of burner hearth, fume extractor includes smoke explorer, and the one of smoke explorer
End connects with flue, and the other end of smoke explorer is connected with smoke exhaust fan, and the exhaust outlet of smoke exhaust fan is connected with chimney.
Flue is silica brick heat conduction flue.
The first temperature-detecting device is provided with heating furnace, second temperature detection means is provided with preheating burner hearth.
Another technical scheme of the present invention is a kind of side of gas heating stove heat titanium and titanium alloy ingot casting
Method, using a kind of gas-fired heater, comprise the following steps：
Step 1, it would be desirable to which the titanium and titanium alloy ingot casting of heating transports heating furnace by chassis；
Step 2, it would be desirable to which the titanium and titanium alloy ingot casting of preheating transports preheating burner hearth by chassis；
Step 3, heating furnace is heated, while opened smoke-discharging device, heating furnace is heated to 1000~1200
DEG C, keep 3~5h；Preheating burner hearth is preheating to 700~800 DEG C, keeps 3~5h；
Step 4, the titanium and titanium alloy ingot casting heated is transported into heating furnace；
Step 5, preheated titanium and titanium alloy ingot casting is transported into heating furnace, repeat step 2-5 operation.
A kind of beneficial effect of gas-fired heater of the present invention is, using discharging cigarette in natural gas combustion device heating process
The waste heat of gas, by setting up preheating burner hearth, rationally designing silica brick heat conduction flue and useless cigarette tapping equipment, do not increasing the feelings of fuel
Under condition, using reasonable, feasible heating technology controlling and process, to complete the warm to ingot casting.This method instead of completely titanium and
Titan alloy casting ingot uses the warm of natural gas in heating furnace, the cyclic utilization rate of natural gas is improved 30%.
Brief description of the drawings
Fig. 1 is a kind of structural representation of gas-fired heater of the present invention.
In figure, 1. first dodge gates, 2. heating furnaces, 3. second dodge gates, 4. preheating burner hearths, 5. flues, 6. the 3rd live
Dynamic door, 7. tracks, 8. fume extractors, 9. chassis, 10. heated by natural gas devices.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
A kind of gas-fired heater of the present invention, as shown in figure 1, including heated by natural gas device 10, heating furnace 2 and preheating
Burner hearth 4, heated by natural gas device 10 are connected with heating furnace 2, and one end of heating furnace 2 is provided with the first dodge gate 1, heating furnace
The other end of thorax 2 is connected with preheating one end of burner hearth 4, and the other end of preheating burner hearth 4 is provided with the 3rd dodge gate 6, heating furnace 2
The second dodge gate 3 is provided between preheating burner hearth 4；Flue 5, the port of the one end of flue 5 and heating furnace are provided with preheating burner hearth 4
2 connections, heating furnace 2 and preheating burner hearth 4 bottom are provided with track 7, coordinate on track 7 and are provided with the chassis 9 with transmission device.
Heating furnace 2 includes heating furnace body, and heating furnace lining is provided with heating furnace body.
Preheating burner hearth 4 includes preheating body of heater, and preheating furnace lining is provided with preheating furnace body, and flue 5 is arranged on the interior of preheating furnace lining
On wall.
Preheat and be additionally provided with fume extractor 8 on the preheating body of heater of burner hearth 4, fume extractor 8 includes smoke explorer, smoke explorer
One end connects with flue 5, and the other end of smoke explorer is connected with smoke exhaust fan, and the exhaust outlet of the smoke exhaust fan is connected with cigarette
Chimney.
Flue 5 is silica brick heat conduction flue.
The first temperature-detecting device is provided with heating furnace 2, second temperature detection means is provided with preheating burner hearth 4.
A kind of method of a kind of gas heating stove heat titanium and titanium alloy ingot casting of the present invention, using gas-fired heater, bag
Include following steps：
Step 1, it would be desirable to which the titanium and titanium alloy ingot casting of heating transports heating furnace 2 by chassis 9；
Step 2, it would be desirable to which the titanium and titanium alloy ingot casting of preheating transports preheating burner hearth 4 by chassis 9；
Step 3, heating furnace 2 is heated, while opened smoke-discharging device 8, heating furnace 2 is heated to 1000~
1200 DEG C, keep 3~5h；Preheating burner hearth is preheating to 700~800 DEG C, keeps 3~5h；
Step 4, the titanium and titanium alloy ingot casting heated is transported into heating furnace 2；
Step 5, preheated titanium and titanium alloy ingot casting is poured into heating furnace 2, repeat step 2-5 operation.
Heated by natural gas device 10 provides heat for heating furnace, and the critical piece of heated by natural gas device 10 includes naturally
Gas burner and gas pipeline, air pipe line, heated by natural gas device 10 can ensure that natural gas is steady, efficient in heating process
Burning；Heating furnace 2 includes heating furnace body and heating furnace lining, and heating furnace body is welded by Q235 channel-section steels, in operating temperature
Upper section uses Cr25Ni20 heat resisting steel, ensures that body of heater is integrally indeformable, durable；Heating furnace lining uses high-temperature fibre
Cotton, it is ensured that the heating furnace overall heat resistance of heating furnace and heat insulating ability when being heated at high temperature for 1200 DEG C；Preheating burner hearth 4 is included in advance
Hot stove body and preheating furnace lining, wherein preheating body of heater is welded by Q235 channel-section steels, are used in operating temperature upper section
Cr25Ni20 heat resisting steel, it is ensured that body of heater is integrally indeformable, durable；Preheat furnace lining to form using highiy refractory brick, protect
The heat resistance and durability of card preheating burner hearth preheated charge in 700~800 DEG C of temperature ranges, are set on preheating furnace lining inwall
Silica brick heat conduction flue, the cigarette being had surplus heat to band caused by combustion of natural gas in heating furnace can be realized by fume extractor 8
The Rational flow of gas, to complete the preheating to preheating burner hearth；First dodge gate 1, the second dodge gate 3 and the 3rd dodge gate 6
The lifting of dodge gate is realized to be driven by cogwheel, decelerator and motor, the transmission device of chassis 9 is by cogwheel, deceleration
Device and motor are driven to form；Furnace temperature passes through the first temperature-detecting device and the second temperature respectively in heating furnace 2 and preheating burner hearth 4
Detection means is spent to detect, and the first temperature-detecting device and second temperature detection means are temperature thermocouple.
Furnace temperature parameter in heating furnace 2 and preheating burner hearth 4 be can transmit in control system, and day is controlled by control system
Right gas heater 10 provides suitable heat for heating furnace 2, while control system also controls the first dodge gate 1, second
The unlatching of the dodge gate 6 of dodge gate 3 and the 3rd and the motion of chassis 9, control system are realized using computer (technical grade) host computer
The input of required control parameter, status monitoring, data storage and required data output and printing, host computer are touched using China's band is ground
The inserted all-in-one of screen.Control system uses SIMATIC S7-1500PLC as system control core, and a full set uses Germany suddenly
Coudé combustion system and control system, the configuration of system are based on PROFIBUS-DP industrial on-site networks, and SIMATICS7-1500 makees
For DP main websites, line number can be entered by the PROFIBUS-DP interfaces being integrated on SIMATICS7-1500CPU and other control units
According to transmission, automatically controlling for system is realized.
Do not shed externally in order to which burner hearth heat is effectively ensured, the sealing system of preheating burner hearth 4 is included to the He of the second dodge gate 3
Sealing, the side seal of preheating burner hearth 4 and chassis 9 of 3rd dodge gate 6；The sealing of dodge gate is using weight compression formula sealing knot
Structure, the side seal of chassis 9 use sand seal blade sealing structure.
The process heated to titanium and titanium alloy ingot casting, preheated is：First dodge gate 1 and the second dodge gate 3 are opened,
Chassis 9 is outputed outside heating furnace 2 along track 7, transported the ingot casting loading chassis 9 for needing to heat using driving a vehicle or taking on truck
Deliver in heating furnace 2, the 3rd dodge gate 6 is opened, chassis 9 is outputed outside preheating burner hearth 4 along track 7, it would be desirable to preheat
Ingot casting load chassis 9 and be transported in preheating burner hearth 4, then fall the first dodge gate 1, the second dodge gate 3 successively and the 3rd live
Dynamic door 6；When heating furnace 2 heats to titanium and titanium alloy ingot casting therein, flue gas is by being arranged in caused by combustion of natural gas
The silica brick heat conduction flue 5 set on the preheating inwall of burner hearth 4, in the presence of fume extractor 8, preheating burner hearth 4 is continually flowed through,
The incidental waste heat of flue gas itself will be between preheating burner hearth 4 be heated to 700~800 DEG C by way of conduction, and preheating burner hearth 4 is logical
Cross the convection current of air and the radiation of burner hearth is realized and the synchronous of ingot casting in preheating burner hearth 4 is preheated, when the ingot casting in heating furnace 2 adds
After the completion of heat, the first dodge gate 1 and the second dodge gate 3 are opened, chassis 9 is outputed outside heating furnace 2 along track 7, is utilized
Drive a vehicle or take on truck and remove the ingot casting heated and produced, meanwhile, using driving a vehicle or take on truck by preheated casting
Ingot is moved in heating furnace 2 by preheating burner hearth 4 and heated, and then opens the 3rd dodge gate 6, in burner hearth 4 is preheated again
Loading needs the ingot casting that preheats, and chassis 9 is opened in the relevant position of preheating burner hearth 4 along track 7, falls the first dodge gate 1, the
Two dodge gates 3 and the 3rd dodge gate 6, igniting are heated, and now, preheated ingot casting is begun to warm up in heating furnace 2, preheating
The ingot casting for needing to preheat in burner hearth 4 also begins to be preheated.
Embodiment 1
The pure titanium ingot casting that the raw material selection trade mark is TA2, specification is 1020 × 2800mm of Φ, ingot weight is 10t.
The ingot casting for needing to heat will be installed in heating furnace 2；Chassis 9 is outputed outside preheating burner hearth 4 along track 7, utilized
Drive a vehicle or take on truck 1020 × 2800mm of Φ of required preheating, the pure titanium ingot casting that ingot weight is 10t are fitted into chassis 9, by platform
Car 9 is opened inside preheating burner hearth 4 along track 7；The titanium and titanium alloy ingot casting that is installed therein is heated when passing through heating furnace 2
When, flue gas caused by combustion of natural gas is by being arranged in the silica brick heat conduction flue 5 preheated on burner hearth 4, in the effect of fume extractor 8
Under, preheating burner hearth 4 is continually flowed into, the incidental waste heat of flue gas itself is heated to by the form of conduction by burner hearth 4 is preheated
Between 700~800 DEG C；Burner hearth 4 is preheated to realize to pre- in preheating burner hearth 4 by the convection current of air and the radiation of silica brick heat conduction flue 5
The synchronous preheating of hot-cast ingot.
After the completion of the ingot casting heating in heating furnace 2, chassis 9 is outputed outside heating furnace 2 along track 7, utilizes row
Car takes on truck and removes the ingot casting heated and produced, meanwhile, using driving a vehicle or take on truck by preheated Φ
1020 × 2800mm, ingot weight are 10t, temperature is moved in heating furnace 2 in 700~800 DEG C of pure titanium ingot casting by preheating burner hearth 4
Row heating, meanwhile, being reloaded in burner hearth 4 preheat needs the ingot casting that preheats, and preheated ingot casting starts to add in heating furnace 2
Heat, preheat the ingot casting that needs to preheat in burner hearth 4 and also begin to be preheated, when the ingot casting heating process in heating furnace 2 terminates, in advance
The warm of ingot casting also synchronously completes in hot stove thorax 4, so that total heat time of ingot casting shortens 4~5 hours.
Such as being heated per hour with gas furnace needs 400m3/ h combustion gas, the pure titanium ingot castings of preheating Φ 1020mm need 4 hour, days
Right gas price lattice are 2 yuan/m3, natural gas 1600m can be saved by being computed every gas furnace one pure titanium ingot casting of stove Φ 1020mm of heating3,
3200 yuan of saving fund.
Embodiment 2
The pure titanium ingot casting that the raw material selection trade mark is TA2, specification is Φ 820mm, ingot weight is 5t.
The process heated to pure titanium ingot casting, preheated such as embodiment 1.
Total heat time of ingot casting is shortened 3~4 hours.Such as being heated per hour with gas furnace needs 400m3/ h fires
Gas, the pure titanium ingot castings of preheating Φ 820mm need 3 hours, Gas Prices be 2 yuan/m3, it is computed every gas furnace and heats a stove Φ
The pure titanium ingot castings of 820mm can save natural gas 1200m3, save 2400 yuan of fund.
A kind of gas-fired heater of the present invention has the following advantages：Using discharging flue gas in natural gas combustion device heating process
Waste heat, by setting up preheating burner hearth, rationally designing silica brick heat conduction flue and useless cigarette tapping equipment, do not increasing the situation of fuel
Under, using reasonable, feasible heating technology controlling and process, to complete the warm to ingot casting.This method instead of titanium and titanium completely
Alloy cast ingot uses the warm of natural gas in heating furnace, titanium and titanium alloy ingot casting total heat time is substantially shortened,
Heating furnace utilization ratio is improved, the cyclic utilization rate of natural gas is improved 30%.
Claims (7)
1. a kind of gas-fired heater, it is characterised in that including heated by natural gas device (10), heating furnace (2) and preheating burner hearth
(4), the heated by natural gas device (10) is connected with heating furnace (2), and one end of the heating furnace (2) is provided with the first work
Dynamic door (1), the other end of the heating furnace (2) is connected with one end of preheating burner hearth (4), described to preheat the another of burner hearth (4)
End is provided with the 3rd dodge gate (6), and the second dodge gate (3) is provided between the heating furnace (2) and the preheating burner hearth (4)；
Flue (5) is provided with the preheating burner hearth (4), the port of described flue (5) one end connects with heating furnace (2), the heating
Burner hearth (2) and preheating burner hearth (4) bottom are provided with track (7), coordinate on the track (7) and are provided with the chassis with transmission device
(9)。
2. a kind of gas-fired heater according to claim 1, it is characterised in that the heating furnace (2) includes heating furnace
Body, the heating furnace body is interior to be provided with heating furnace lining.
3. a kind of gas-fired heater according to claim 1, it is characterised in that the preheating burner hearth (4) includes preheating furnace
Body, the preheating furnace body is interior to be provided with preheating furnace lining, and the flue (5) is arranged on the inwall of preheating furnace lining.
A kind of 4. gas-fired heater according to claim 3, it is characterised in that the preheating body of heater of the preheating burner hearth (4)
On be additionally provided with fume extractor (8), the fume extractor (8) includes smoke explorer, one end of the smoke explorer with flue (5) even
Logical, the other end of the smoke explorer is connected with smoke exhaust fan, and the exhaust outlet of the smoke exhaust fan is connected with chimney.
5. a kind of gas-fired heater according to claim 4, it is characterised in that the flue (5) is silica brick heat conduction flue.
6. a kind of gas-fired heater according to claim 1, it is characterised in that first is provided with the heating furnace (2)
Temperature-detecting device, the preheating burner hearth (4) is interior to be provided with second temperature detection means.
A kind of 7. method of gas heating stove heat titanium and titanium alloy ingot casting, it is characterised in that using as claimed in claim 1
A kind of gas-fired heater, comprises the following steps：
Step 1, it would be desirable to which the titanium and titanium alloy ingot casting of heating transports heating furnace (2) by chassis (9)；
Step 2, it would be desirable to which the titanium and titanium alloy ingot casting of preheating transports preheating burner hearth (4) by chassis (9)；
Step 3, heating furnace (2) is heated, while opened smoke-discharging device (8), heating furnace (2) is heated to 1000~
1200 DEG C, keep 3~5h；Preheating burner hearth is preheating to 700~800 DEG C, keeps 3~5h；
Step 4, the titanium and titanium alloy ingot casting heated is transported into heating furnace (2)；
Step 5, preheated titanium and titanium alloy ingot casting is transported into heating furnace (2), repeat step 2-5 operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710806093.0A CN107367168A (en) | 2017-09-08 | 2017-09-08 | A kind of gas-fired heater and its method for heating titanium and titanium alloy ingot casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710806093.0A CN107367168A (en) | 2017-09-08 | 2017-09-08 | A kind of gas-fired heater and its method for heating titanium and titanium alloy ingot casting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107367168A true CN107367168A (en) | 2017-11-21 |
Family
ID=60312426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710806093.0A Pending CN107367168A (en) | 2017-09-08 | 2017-09-08 | A kind of gas-fired heater and its method for heating titanium and titanium alloy ingot casting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107367168A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108251853A (en) * | 2018-02-27 | 2018-07-06 | 浙江绿维环境股份有限公司 | A kind of descaling bath acid mist collection system |
| CN109405549A (en) * | 2018-12-04 | 2019-03-01 | 大禹节水（天津）有限公司 | A kind of electric furnace for carbon black detection |
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| CN201922001U (en) * | 2010-12-28 | 2011-08-10 | 西部钛业有限责任公司 | Energy saving device for producing cast ingots of titanium and titanium alloy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108251853A (en) * | 2018-02-27 | 2018-07-06 | 浙江绿维环境股份有限公司 | A kind of descaling bath acid mist collection system |
| CN109405549A (en) * | 2018-12-04 | 2019-03-01 | 大禹节水（天津）有限公司 | A kind of electric furnace for carbon black detection |
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