CN206244825U - A kind of preheating energy-saving systems - Google Patents
A kind of preheating energy-saving systems Download PDFInfo
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- CN206244825U CN206244825U CN201621200027.6U CN201621200027U CN206244825U CN 206244825 U CN206244825 U CN 206244825U CN 201621200027 U CN201621200027 U CN 201621200027U CN 206244825 U CN206244825 U CN 206244825U
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- heat
- pipe
- chamber
- combustion
- heat exchanging
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Abstract
The utility model discloses a kind of furnace preheating system high,Specifically a kind of preheating energy-saving systems,Including hot-blast stove,Control valve with circuits and in circuits,It is described with setting front combustion in circuits,Preposition air blower is connected on the front end pipeline of the front combustion,It is described to include coal gas heat exchanging pipe and combustion air heat exchanging pipe with circuits,The coal gas heat exchanging pipe and the inlet end of combustion air heat exchanging pipe are connected with the gas outlet of front combustion,With the above mentioned technical proposal,A kind of preheating energy-saving systems described in the utility model are by setting double loop by coal gas and helping hot air,Simultaneously,Attemperator is set,Pipeline is optimized,Further energy-saving and emission-reduction,Make heat exchange efficiency higher,Maximally utilize the heat exchange energy,Ensure the temperature of combustion air,Reduce the consumption of combustion material,Improve efficiency of combustion.
Description
Technical field
The utility model is related to a kind of furnace preheating system high, specifically a kind of preheating energy-saving systems.
Background technology
With the development of process for making technology, reduce blast-furnace roasting consumption and seem more and more important, reduce burning consumption
Major measure is improved wind-warm syndrome, improves gas utilization rate and improves material condition etc., because China's blast furnace air temperature is generally relatively low, because
This improves wind-warm syndrome and also has very big potentiality, and the flue gas that hot-blast stove enters flue is the waste gas after burning, and the flue gas is after combustion still
So there is remaining temperature, its temperature is 200 degree of -300 degree left and right, and exhaust gas volumn is larger, therefore, by using the heat of hot-blast stove fume
It is also research direction main in recent years to carry out warm-up combustion-supporting air, but the mode shortcoming of this simple utilization smoke pre-heating is：
Air themperature after preheating is much not up to combustion-supporting standard, repeatedly repeatedly preheating time it is more long, it is necessary to pipeline it is equally more long,
And energy input is big, combustion air loss, causes utilization rate relatively low in heat transfer process.
Such as Patent No.：200410070660.3, patent name is：Blast furnace combustion air stove high temperature primary heater unit and its
Mentioned in the patent of technique by setting combustion air preheated in high temperature stove before combustion air stove, by preheating furnace by air
Heating, the waste gas that the air after heating is discharged with hot-blast stove mixes, combustion air is heated, and combustion air enters hot-blast stove
In, the wind-warm syndrome in combustion process is improved, advantage of this is that improving wind-warm syndrome, burning consumption is reduced, but shortcoming is its loop
Set complicated, and be intended to improve combustion air temperature, the utilization rate of coal gas is not improved, meanwhile, in the system and it is not provided with heat
Can store and attemperator, thermal energy consumption is larger in hot blast transmit process, causes energy waste, meanwhile, in burning,
When reaching required hot blast rate, it is impossible to stored as needed, to provide the burning needs of next stage, pipeline transmit process compared with
It is long, design and unreasonable, do not meet the fundamental policies of energy-saving and emission-reduction.
Utility model content
In order to make up, the above is not enough, and the utility model provides the pre-heating energy-saving that a kind of loop is reasonable in design, energy consumption is relatively low
System, with solving the problems, such as above-mentioned background technology.
The technical solution of the utility model is：
A kind of preheating energy-saving systems, including hot-blast stove, the control valve with circuits and in circuits, it is described
With front combustion is set in circuits, preposition air blower is connected on the front end pipeline of the front combustion, it is described to match somebody with somebody
Circuits include coal gas heat exchanging pipe and combustion air heat exchanging pipe, the coal gas heat exchanging pipe and combustion air heat exchanging pipe
Inlet end is connected with the gas outlet of front combustion, outlet side and the heat of the coal gas heat exchanging pipe and combustion air heat exchanging pipe
The inlet end of wind furnace is connected, and Ling You mixing chamber is connected in coal gas heat exchanging pipe, and the gas outlet connection of the hot-blast stove is useless
Air pipe, the exhaust pipe outlet end is communicated in mixing chamber, gas change heater of being connected in the coal gas heat exchanging pipe,
The mixing chamber is in pipeline positioned at the front portion of gas change heater, the inlet end connection coal gas air blast of the gas change heater
Machine, the waste gas outlet of the gas change heater is connected with being arranged on by pipeline with the chimney in circuits, the preposition combustion
Heat-storing device of being connected on the pipeline between stove and mixing chamber is burnt, is connected on the pipeline between the heat-storing device and mixing chamber
Unidirectionally controlled valve.
Used as preferred technical scheme, the heat-storing device includes heat accumulation chamber and the incubation cavity being wrapped on the outside of heat accumulation chamber,
The air inlet pipe in the heat accumulation chamber, escaping pipe and bypass escaping pipe both pass through incubation cavity and extend to outside, the air inlet in the heat accumulation chamber
Pipe is connected by connecting line with the gas outlet of front combustion, and the escaping pipe in the heat accumulation chamber is communicated to coal gas heat exchanging pipe
In, the bypass escaping pipe in the heat accumulation chamber is communicated in combustion air heat exchanging pipe, and the combustion air pipeline and coal gas exchange heat
Equal serial temperature determines device in pipeline, is respectively provided with electric-controlled switch in the escaping pipe and bypass escaping pipe in the heat accumulation chamber
Valve, the electric-controlled switch is connected with temperature measuring apparatus by signal.
As preferred technical scheme, there is opening on the outer wall of the incubation cavity, separately there is the vacuum being connected with vavuum pump
Pipe is inserted in the opening.
As preferred technical scheme, there is opening on the outer wall of the incubation cavity, separately there is the inflation being connected with inflator pump
Pipe is inserted in the opening.
As preferred technical scheme, forcing pipe is also connected in the heat accumulation chamber, one section of the forcing pipe passes through incubation cavity
Outside is extended to, the forcing pipe is connected with the pressue device on the outside of incubation cavity.
Used as preferred technical scheme, the gas change heater includes housing shape heat exchanging chamber and is wrapped in heat exchanging chamber outside
External heat-exchanging chamber, inserting heat exchanger tube in the heat exchanging chamber, on the outside of the outer end of the heat exchanger tube extends to through external heat-exchanging chamber,
The inner of the heat exchanger tube is connected through the side wall of heat exchanging chamber with external heat-exchanging chamber, the heat exchange air inlet pipe that is connected with heat exchanging chamber and
Heat exchange escaping pipe each extends to the outside in external heat-exchanging chamber, and there is waste gas to output mouth, the waste gas discharge in the external heat-exchanging chamber
Exhaust emission tube of the inserting with control valve in mouthful.
Used as preferred technical scheme, the heat exchanger tube is communicated with valve, the communicating valve with external heat-exchanging chamber connectivity part
The valve plate inner including being fitted in heat exchanger tube, valve plate is provided with can be described by rotating the intercommunicating pore connected with heat exchanger tube the inner
Connection rotating shaft on valve plate, rotating shaft one end extends to external heat-exchanging chamber outside by the axle sleeve being arranged on external heat-exchanging cavity outer wall,
And the roller end on the outside of externally-located heat exchanging chamber is provided with rotation handle.
Used as preferred technical scheme, the outside connection of the heat exchanger tube sets the wing that goes for a drive in divergent shape around heat exchanger tube
Piece, the section of the fin is arc-shaped.
Used as preferred technical scheme, the external heat-exchanging chamber has the pumping being connected by connecting tube with aspiration pump
Mouthful, the outlet side of the aspiration pump is connected by connecting line with chimney.
By adopting the above-described technical solution, a kind of preheating energy-saving systems described in the utility model are by setting double loop
Coal gas and hot air will be helped, meanwhile, energy-storage system is set, unnecessary heat energy is stored, needed for follow-up burning, it is to avoid
Energy resource consumption, meanwhile, attemperator is set, pipeline is optimized, further energy-saving and emission-reduction make heat exchange efficiency higher, maximize profit
With the heat exchange energy, it is ensured that the temperature of combustion air, the consumption of combustion material is reduced, improve efficiency of combustion.
Brief description of the drawings
In order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the utility model embodiment；
Fig. 2 is the structural representation of the utility model heat exchanger；
Fig. 3 is the structural representation of the utility model heat-storing device；
Fig. 4 is the sectional schematic diagram of the utility model heat exchanger tube.
In figure：1st, hot-blast stove；2nd, front combustion；3rd, preposition air blower；4th, coal gas heat exchanging pipe；5th, combustion air heat exchange
Pipeline；6th, mixing chamber；7th, exhaust pipe；8th, gas change heater；9th, exhaust gas control valve door；10th, gas-blowing engine；11st, chimney；
12nd, heat-storing device；13rd, unidirectionally controlled valve；14th, temperature measuring apparatus；15th, electric-controlled switch valve；16th, preposition air-supply valve；
101st, heat accumulation chamber；102nd, incubation cavity；103rd, air inlet pipe；104th, escaping pipe；105th, escaping pipe is bypassed；106th, vavuum pump；108th, add
Pressure device；201st, heat exchanging chamber；202nd, external heat-exchanging chamber；203rd, heat exchanger tube；204th, valve is controlled；205th, exhaust emission tube；206th, change
Hot air inlet pipe；207th, exchange heat escaping pipe；208th, valve plate；209th, rotating shaft；210th, fin；211st, aspiration pump；
Specific embodiment
Embodiment one：It is as shown in figure 1, a kind of preheating energy-saving systems described in the utility model including hot-blast stove 1, supporting
Pipeline and the control valve in circuits 18, the control valve 18 are arranged on the connecting tube between connection stream oriented device
Lu Shang, the hot-blast stove 1 is common blast furnace, be will not be repeated here, described with front combustion 2 is set in circuits, described
Front combustion 2 is located at pipeline foremost, and the air inlet of front combustion 2 is connected by connecting line with preposition air blower 3,
Preposition air-supply valve 16 is set on the connecting line between the preposition air blower 3 and front combustion 2, preposition blow valve is opened
Door 16, is heated by front combustion 2 and reached by preposition air blower 3 to air, the air of injection is injected in front combustion 2
Assigned temperature, generally 1200 degree -1500 degree opens air-supply step.
It is described to include coal gas heat exchanging pipe 4 and combustion air heat exchanging pipe 5, the He of coal gas heat exchanging pipe 4 with circuits
The inlet end of combustion air heat exchanging pipe 5 is connected with the gas outlet of front combustion 2, the coal gas heat exchanging pipe 4 and combustion-supporting sky
The outlet side of gas heat exchanging pipe 5 is connected with the inlet end of hot-blast stove 1, sends into coal gas heat exchanging pipe 4 and combustion air heat exchanger tube
Hot blast in road 5 is entered in hot-blast stove 1 by heat exchange, energy storage, and Ling You mixing chamber 6 is connected in coal gas heat exchanging pipe 4, described
The gas outlet connection exhaust pipe 7 of hot-blast stove 1, the outlet end of the exhaust pipe 7 is communicated in mixing chamber 6, the waste gas
Series connection exhaust gas control valve door 9 in pipeline 7, the mixing chamber 6 is used for the waste gas of mixing hot blast stove 1 with the heating of front combustion 2
Hot blast, by exhaust gas control valve door 9 opening and closing, control hot blast mix with waste gas two, so as to reach needs exchange heat
Temperature.
In the coal gas heat exchanging pipe 4 connect gas change heater 8, gas change heater 8 have gas entry, gas exit,
Recuperated gas entrance and waste gas outlet, the mixing chamber 6 in pipeline positioned at gas change heater 8 front portion, mixing chamber 6 with
Control valve, the inlet end connection gas-blowing engine 10 of the gas change heater 8, institute are set on the pipeline between gas change heater 8
State the waste gas outlet of gas change heater 8 to be connected with the chimney 11 in circuits with being arranged on by pipeline, the waste gas after heat exchange
Temperature drop, by discharge of pipes to chimney in, by purification runs such as dust removals by filtration, be discharged into air.
Connected on pipeline between the front combustion 2 and mixing chamber 6 heat-storing device 12, the heat-storing device 12 with
Connected on pipeline between mixing chamber 6 unidirectional control valve 13, the gas flow heat-storing device 12 in mixing chamber 6, it is to avoid
Gas backstreaming.
As shown in figure 3, the heat-storing device includes heat accumulation chamber 101 and is wrapped in the incubation cavity 102 in the outside of heat accumulation chamber 101,
Hot blast after the front combustion 2 is heated enters in heat accumulation chamber 101, by the incubation cavity 102 for being arranged on the outside of heat accumulation chamber 101
Be incubated, placed insulation material in incubation cavity 102, the insulation material be have in the prior art, heat-insulating property it is good
Material, will not be repeated here, and the air inlet pipe 103 in the heat accumulation chamber 102, escaping pipe 104 and bypass escaping pipe 105 both pass through insulation
Chamber 102 extends to outside, and the air inlet pipe 103 in the heat accumulation chamber 101 is connected by connecting line with the gas outlet of front combustion 2
Logical, the escaping pipe 104 in the heat accumulation chamber 101 is communicated in coal gas heat exchanging pipe 4, the bypass escaping pipe 105 in the heat accumulation chamber 101
It is communicated in combustion air heat exchanging pipe 5, equal serial temperature determines dress in the combustion air pipeline 5 and coal gas heat exchanging pipe 4
14 are put, the valve 15 with electric-controlled switch is respectively provided with the escaping pipe 104 and bypass escaping pipe 105 in the heat accumulation chamber 101, it is described
Electric-controlled switch is connected with temperature measuring apparatus 14 by signal.
Temperature reaches designated value in the pipeline of temperature measuring apparatus measurement, and temperature measuring apparatus send a signal to automatically controlled opening
Close, control valve 15 is closed, and the hot blast in heat accumulation chamber 101 is no longer exported, be incubated in heat accumulation chamber 101, after being easy to
Afterflame burns to be needed, and when temperature is not up to designated value in the pipeline of temperature measuring apparatus measurement, temperature measuring apparatus send a signal to
Electric-controlled switch, control valve 15 is opened, and the hot blast in heat accumulation chamber 101 is continued to output, and the afterflame burning for hot-blast stove 1 is needed
Will.
While the filling insulation material of the incubation cavity 102, vacuum or pressurized treatments can be carried out, further increase its insulation
Effect, it is to avoid heat energy loss is excessive, has opening on the outer wall of the incubation cavity 102, separately there is the vacuum being connected with vavuum pump 106
Pipe is inserted in the opening.Opening on the outer wall of the incubation cavity 102 can be connected with pressue device, in incubation cavity 102
Pressurization.
Further is increase heat insulation effect, and pressue device 108, the pressue device are also connected in the heat accumulation chamber 101
108 1 sections extend to outside through incubation cavity 102, and the hot blast in heat accumulation chamber 101 is pressurizeed by pressue device 108, and pressure increases
Its temperature has been raised while big.
As shown in Fig. 2 the gas change heater 8 includes housing shape heat exchanging chamber 201 and is wrapped in the outer of the outside of heat exchanging chamber 201
Inserting heat exchanger tube 203 in portion's heat exchanging chamber 202, the heat exchanging chamber 201, the outer end of heat exchanger tube 203 passes through described in the heat exchanger tube 203
External heat-exchanging chamber 202 extends to outside, and hot blast enters in heat exchanger tube 203, and the inner of the heat exchanger tube 203 passes through heat exchanging chamber 201
Side wall be connected with external heat-exchanging chamber 202, the external heat-exchanging chamber 202 is exchanged heat in the outside of heat exchanging chamber 201, meanwhile,
The recuperated gas contact cool exterior air in heat transfer process in heat exchanging chamber 201 is avoided, thermal energy consumption is reduced, connected with heat exchanging chamber 201
Logical heat exchange air inlet pipe 206 and heat exchange escaping pipe 207 each extend to the outside in external heat-exchanging chamber 202, heat exchange air inlet pipe 206 and change
Hot escaping pipe 207 is used for the inlet and outlet of coal gas, and mouth is outputed in the external heat-exchanging chamber 202 with waste gas, is cooled down after heat exchange
Air is discharged by outlet port, and exhaust emission tube 205 of the inserting with control valve 204, described in the outlet port
The chimney 11 of exhaust emission tube more than 205 is connected.
The heat exchanger tube 203 is communicated with valve with the connectivity part of external heat-exchanging chamber 202, and the communicating valve includes being fitted in heat exchange
The inner valve plate 208 of pipe, valve plate 208 is provided with can be by rotating the intercommunicating pore connected with the inner of heat exchanger tube 203, on the valve plate
Connection rotating shaft 209, one end of rotating shaft 209 extends to external heat-exchanging chamber 202 by the axle sleeve being arranged on the outer wall of external heat-exchanging chamber 202
Outside, and the roller end in the outside of externally-located heat exchanging chamber 202 is provided with rotation handle, rotating shaft makes the connection on valve plate 208
Hole connects with heat exchanger tube 203, and the hot blast in heat exchanger tube 203 enters external heat-exchanging chamber 202, and rotational valve plate 208, make intercommunicating pore again
Do not connected with heat exchanger tube 203, only can be exchanged heat in heat exchanging chamber 201, be not required to external heat-exchanging.
As shown in figure 4, the outside connection of the heat exchanger tube 203 sets the fin that goes for a drive in divergent shape around heat exchanger tube 203
210, the section of the fin 210 is arc-shaped, and the fin 210 plays the coal gas wind speed slowed down in entrance heat exchanging chamber 201
Effect, improves heat transfer effect.
The external heat-exchanging chamber 202 has the bleeding point being connected by connecting tube with aspiration pump 211, the aspiration pump
211 outlet side is connected by connecting line with chimney 11.
General principle of the present utility model, principal character and advantage of the present utility model has been shown and described above.One's own profession
The technical staff of industry it should be appreciated that the utility model is not restricted to the described embodiments, described in above-described embodiment and specification
Simply illustrate principle of the present utility model, on the premise of the utility model spirit and scope are not departed from, the utility model is also
Various changes and modifications are had, these changes and improvements are both fallen within the range of claimed the utility model.The utility model
Claimed scope is by appending claims and its equivalent thereof.
Claims (9)
1. a kind of preheating energy-saving systems, including hot-blast stove, the control valve with circuits and in circuits, its feature
It is：It is described with front combustion is set in circuits, connect preposition air blast on the front end pipeline of the front combustion
Machine, it is described to include coal gas heat exchanging pipe and combustion air heat exchanging pipe, the coal gas heat exchanging pipe and combustion air with circuits
The inlet end of heat exchanging pipe is connected with the gas outlet of front combustion, the coal gas heat exchanging pipe and combustion air heat exchanging pipe
Outlet side is connected with the inlet end of hot-blast stove, Ling You mixing chamber is connected in coal gas heat exchanging pipe, and the hot-blast stove goes out
Gas port connects exhaust pipe, and the exhaust pipe outlet end is communicated in mixing chamber, is connected in the coal gas heat exchanging pipe
Gas change heater, positioned at the front portion of gas change heater in pipeline, the inlet end of the gas change heater connects for the mixing chamber
Ventilating coal gas air blower, the waste gas outlet of the gas change heater is connected with being arranged on by pipeline with the chimney in circuits,
Connected on pipeline between the front combustion and mixing chamber heat-storing device, between the heat-storing device and mixing chamber
Connected on pipeline unidirectional control valve.
2. a kind of preheating energy-saving systems as claimed in claim 1, it is characterised in that：The heat-storing device includes heat accumulation chamber and bag
It is rolled in the incubation cavity on the outside of heat accumulation chamber, the air inlet pipe in the heat accumulation chamber, escaping pipe and bypass escaping pipe both pass through incubation cavity extension
To outside, the air inlet pipe in the heat accumulation chamber is connected by connecting line with the gas outlet of front combustion, the heat accumulation chamber
Escaping pipe is communicated in coal gas heat exchanging pipe, and the bypass escaping pipe in the heat accumulation chamber is communicated in combustion air heat exchanging pipe, institute
Serial temperature determines device, the escaping pipe and bypass outlet in the heat accumulation chamber in stating combustion air pipeline and coal gas heat exchanging pipe
The valve with electric-controlled switch is respectively provided with pipe, the electric-controlled switch is connected with temperature measuring apparatus by signal.
3. a kind of preheating energy-saving systems as claimed in claim 2, it is characterised in that：Have on the outer wall of the incubation cavity and open
Mouthful, separately there is the vacuum tube being connected with vavuum pump to insert in the opening.
4. a kind of preheating energy-saving systems as claimed in claim 3, it is characterised in that：Have on the outer wall of the incubation cavity and open
Mouthful, separately there is the gas tube being connected with inflator pump to insert in the opening.
5. a kind of preheating energy-saving systems as described in claim 3 or 4, it is characterised in that：Also connection pressurization in the heat accumulation chamber
Pipe, one section of the forcing pipe extends to outside, the forcing pipe and the pressue device phase on the outside of incubation cavity through incubation cavity
Connection.
6. a kind of preheating energy-saving systems as described in claim 1,2,3 or 4, it is characterised in that：The gas change heater is wrapped
Include inserting heat exchanger tube, the heat exchange in housing shape heat exchanging chamber and the external heat-exchanging chamber being wrapped on the outside of heat exchanging chamber, the heat exchanging chamber
The outer end of pipe extends to outside through external heat-exchanging chamber, and the inner of the heat exchanger tube passes through side wall and the external heat-exchanging chamber of heat exchanging chamber
It is connected, the heat exchange air inlet pipe and heat exchange escaping pipe that are connected with heat exchanging chamber each extend to the outside in external heat-exchanging chamber, the outside
There is heat exchanging chamber waste gas to output mouth, exhaust emission tube of the inserting with control valve in the outlet port.
7. a kind of preheating energy-saving systems as claimed in claim 6, it is characterised in that：The heat exchanger tube is connected with external heat-exchanging chamber
Place is communicated with valve, and the communicating valve includes being fitted in the inner valve plate of heat exchanger tube, and valve plate is provided with can be by rotating and heat exchange
The intercommunicating pore of the inner connection of pipe, connection rotating shaft on the valve plate, rotating shaft one end is by the axle that is arranged on external heat-exchanging cavity outer wall
Set extends to external heat-exchanging chamber outside, and roller end on the outside of externally-located heat exchanging chamber is provided with rotation handle.
8. a kind of preheating energy-saving systems as claimed in claim 7, it is characterised in that：The outside connection of the heat exchanger tube is in diverging
Shape sets the fin that goes for a drive around heat exchanger tube, and the section of the fin is arc-shaped.
9. a kind of preheating energy-saving systems as claimed in claim 7, it is characterised in that：The external heat-exchanging chamber has and aspiration pump
The bleeding point being connected by connecting tube, the outlet side of the aspiration pump is connected by connecting line with chimney.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621200027.6U CN206244825U (en) | 2016-11-07 | 2016-11-07 | A kind of preheating energy-saving systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621200027.6U CN206244825U (en) | 2016-11-07 | 2016-11-07 | A kind of preheating energy-saving systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206244825U true CN206244825U (en) | 2017-06-13 |
Family
ID=59000982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621200027.6U Withdrawn - After Issue CN206244825U (en) | 2016-11-07 | 2016-11-07 | A kind of preheating energy-saving systems |
Country Status (1)
| Country | Link |
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| CN (1) | CN206244825U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399612A (en) * | 2016-11-07 | 2017-02-15 | 上海铁戈炉业有限公司 | Preheating energy saving system and preheating method |
-
2016
- 2016-11-07 CN CN201621200027.6U patent/CN206244825U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399612A (en) * | 2016-11-07 | 2017-02-15 | 上海铁戈炉业有限公司 | Preheating energy saving system and preheating method |
| CN106399612B (en) * | 2016-11-07 | 2019-01-25 | 上海铁戈炉业有限公司 | A kind of preheating energy-saving systems and pre-heating mean |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170613 Effective date of abandoning: 20190125 |
|
| AV01 | Patent right actively abandoned |