CN1626681B - High temperature hot blast furnace - Google Patents
High temperature hot blast furnace Download PDFInfo
- Publication number
- CN1626681B CN1626681B CN 200410033158 CN200410033158A CN1626681B CN 1626681 B CN1626681 B CN 1626681B CN 200410033158 CN200410033158 CN 200410033158 CN 200410033158 A CN200410033158 A CN 200410033158A CN 1626681 B CN1626681 B CN 1626681B
- Authority
- CN
- China
- Prior art keywords
- blast furnace
- high temperature
- gas
- temperature
- hot blast
- Prior art date
- 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.)
- Expired - Fee Related
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 57
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 239000007789 gas Substances 0.000 claims description 44
- 239000003034 coal gas Substances 0.000 claims description 23
- 238000005338 heat storage Methods 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 2
- 239000002912 waste gas Substances 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 22
- 238000009434 installation Methods 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 208000011580 syndromic disease Diseases 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Images
Landscapes
- Air Supply (AREA)
Abstract
The present invention relates to a high temperature hot blast furnace for further resolving the problem of improving temperature of high temperature hot blast furnace to satisfy arbitrary temperature required by high temperature hot blast furnace, and the high temperature hot blast furnace is suitable for rebuilding to facilitate the installation and maintain. The main technical character comprises, adding a pre-heating device (1) for gas and/or combustion air, which can conveniently improve the temperature of blast of the high temperature hot blast furnace. Meantime, the invention has advantages that the temperature setting value of gas and/or combustion air is convenient to adjust and tend to be best match of operation condition of the hot blast furnace; temperature grads, pressure field and fluid field in the main chamber of the hot blast furnace are not basically influenced which conduce stability of the hot blast furnace; the supply process of gas and/or combustion air is stable and continuous; and afterheat utilizing method is not excluded.
Description
Affiliated technical field
The present invention relates to a kind of high temperature hot-blast furnace that is used for blast furnace.
Background technology
Blast-furnace smelting needs the enough high temperature hot blast, and hotblast stove provides the indispensable device of this hot blast.The hotblast stove that current industrial is used is made up of furnace shell, refractory lining, combustion unit, heat storage and channel system.Receive the restriction of calorific value of fuel and fuel and combustion air initial temperature, the common wind pushing temperature of existing hotblast stove generally about 1000-1200 ℃, can not adapt to higher processing requirement.What pay particular attention to is that under so high temperature, the raising again of temperature is very difficult; Simultaneously, even only improve tens degree, also be very useful to smelting process.Therefore, the someone has proposed to increase to use on the top, combustion chamber of hotblast stove to improve furnace temperature through the fuel of preheating and the method for combustion air auxiliary burning nozzle; Usually from the basic purpose of UTILIZATION OF VESIDUAL HEAT IN, interchanger is set at the flue place improves coal gas and the AT that gets into burner besides, obtained the positively effect that improves hot blast temperature.But the weak point of first method is: 1. because it is it is perforate on the sidewall of the high-temperature zone of hotblast stove, bigger to the intensity effect of hotblast stove housing, and incompatible the transformation.2. because its installation site is higher, the installation of equipment and maintenance are extremely inconvenient.3. because there is the problem that the interior useful space utilization ratio of stove is lower and leak out easily in Cowper stove, exist by the substituted tendency of top combustion stove, therefore, applying also of aforesaid method more and more is restricted.4. if attempt aforesaid method is applied to top combustion stove, get the uniform distribution that entraining air stream will influence the pressure field its combustion chamber in, the nonuniform heating of initiation heat storage and cause the undesirable of final hot blast temperature.As for second method, from energy-conservation angle, its effect is more satisfactory; But; When being the angle of primary and foremost purpose to improve the hot blast temperature that hotblast stove produced, it is a kind of limited improvement, does not reach the purpose that increases substantially hot blast temperature.
Summary of the invention
The object of the invention, be to provide a kind of wind-warm syndrome higher, more adapt to transform, safer, installation and easy to maintenance, efficient is higher, the high temperature hot-blast furnace that is used for blast furnace that has wide range of applications.
Basic design of the present invention is; Setting is exclusively used in to increase substantially and gets into or mix the coal gas of main burner and the outer heating unit of combustion air temperature comes coal gas and combustion air are preheated; Send into the temperature of the coal gas and the combustion air of main burner with raising, and then improved theoretical combustion temperature and finally obtained the hot blast that temperature significantly improves.
When preheating temperature at 800 ℃-900 ℃ even below 1000 ℃ the time, outer heating unit can adopt the heat exchanger of non-stop run, this device can be employed in the substruction of the heat exchanger of similar production superheated vapour in the thermal power generation unit.Along with the generation of novel high performance material, under the situation that adopts this heat exchanger, it also is possible further improving Heating temperature.
When the preheating temperature of needs more than 900 ℃ even 1000 ℃ the time, outer heating unit can also be a kind of heat exchanger with public combustion chamber and a plurality of heat storage groups, such device will be compacter, more practical and investment still less.
In two media, require lower the time as a kind of pre-heating temperature of medium, outer heating unit can also be the associated plant of heat exchanger with heat exchanger and non-stop run of public combustion chamber and a plurality of heat storage groups.
Sometimes, only require one of coal gas or combustion air are carried out preheating, at this moment, as long as heating unit is just passable outside on needing the medium channel of preheating, being provided with.As for the above-mentioned outer heating unit of selecting which kind of form for use, can be according to multiple factor balance decisions such as preheating requirements.
When adopting the heat exchanger of non-stop run, adopt heat-accumulating burner also can obtain the double effects of energy-saving and environmental protection.
When adopting the heat-exchange system of alternation, because heat exchanging process hockets, the fluctuation that the temperature of its preheating will inevitably generating period property; At this moment; Can adopt a kind of Gas mixing valve, keep the stable of output temperature or be used for regulating output temperature, make it to meet the requirement of setting.Certainly, when adopting the heat exchanger of non-stop run, also can adopt Gas mixing valve, to obtain to the quick-adjustsing effect of the temperature of gas mixture.
Above said Gas mixing valve can by comprise low wet inlet, High Temperature Gas inlet, mixed gas outlet, to outer extension member have sealing function valve casing and steerable, have positioning function, can form through the valve plate that shift in position is adjusted mixture temperature.
The invention has the beneficial effects as follows: 1. under the condition that refractory materials, heat storage material and system allow, the wind pushing temperature of hotblast stove can reach the required arbitrary temp of technology, thereby can realize the optimization of the maximum of wind-warm syndrome factor in the smelting process.2. the desired temperature of coal gas and combustion air is convenient to adjustment, is easy to realize the optimum matching with the blast furnace operating mode, particularly when the heat exchanger of the similar production superheated vapour of employing.3. the air feed process of coal gas and combustion air is continuous, stable, particularly when adopting the heat exchanger of similar production superheated vapour.4. do not influence thermograde, pressure field and flow field in the hotblast stove primary chamber, help the stable smooth operation of hotblast stove.5. under the prerequisite that does not reduce thermo-efficiency, the present invention has the effect to the smelting system complementary energy.6. the present invention does not repel the basic purpose from UTILIZATION OF VESIDUAL HEAT IN, improves the initial air method of temperature through heat exchanger, and after the method through serial connection employing UTILIZATION OF VESIDUAL HEAT IN, also helps to reduce the size of this heating unit.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.7 pages of drawings attacheds of the present invention, totally 10 width of cloth, wherein:
Fig. 1 is the structure iron of embodiments of the invention one.Wherein, [1] is a kind of traditional hotblast stove, and it can be an internal combustion type; It also can be external combustion type; Can also be top ignition or other forms of, the position of the burner on this hotblast stove should confirm that the position shown in the figure only is a kind of symbolistic expression according to the needs of the type of furnace; Because the configuration of traditional hotblast stove belongs to prior art, just repeated no more about the details of this respect.[2] be a kind of pre-warmed outer heating unit to be carried out in combustion gas and combustion air.Specifically, outer heating unit [2] is a kind of heat exchanger of non-stop run, and it can be employed in the substruction of vapor superheater in the thermal power generation unit.What need special instruction is; Present embodiment is the burning-stage regenerator in traditional hotblast stove [1]; The initial temperature of the coal gas that improves main burner and combustion air reach improve heat storage self temperature requirement as means, significantly improve the purpose of the wind pushing temperature of traditional hot wind furnace with realization.In the accumulation of heat phase of hotblast stove [1], after coal gas and combustion air heat up through outer heating unit [2] through pipeline [3] and [4] respectively, get into the main burner of hotblast stove [1], significantly improved theoretical combustion temperature.
Fig. 3 is in embodiment one, and to heating unit [2] structure diagram of coal gas and combustion air, the characteristics of the scheme shown in this figure are that heat exchanger coexistence to the heating of coal gas and combustion air is in same combustion chamber.Among the figure, [9] are the combustion chambers, and [10] are the heat exchangers that is used to add heating gas; [11] be the heat exchanger that is used to heat combustion air; [12] then be the burner that heats to the combustion chamber, note that when this burner [12] adopts heat-accumulating burner; Except can utilizing low-calorie blast furnace gas, also can obtain energy-conservation and double effects environmental protection.
Fig. 4 also is in embodiment one; Heating unit [2] structure diagram to coal gas and combustion air; The characteristics of the scheme shown in this figure are, are to use independently combustion chamber separately to the heat exchanger of coal gas and combustion air heating, so that to their independent control of Heating temperature.The implication of each code name among the figure among the implication of each code name and Fig. 4 is identical.
Fig. 5, Fig. 6 have explained two kinds of difform tubular heater exchhangers respectively.After placing them in the combustion chamber, pipe at first is heated, and also just has been heated through the gas in managing.Certainly, the specific form of heat exchanger is diversified, has not just explained one by one at this.
Fig. 2 is the structure iron of embodiment two.Wherein, [20] are a kind of coal gas and combustion air to be carried out pre-warmed outer heating unit, and [6] are Gas mixing valves, and [7] and [8] are respectively lower coal gas of temperature and combustion air inlet, and the implication of other label is identical with the implication of the label described in Fig. 1.Specifically, outer heating unit [20] is a kind of heat exchanger with public combustion chamber and a plurality of heat storage groups.
Figure 10 is the sketch with heat exchanger [20] of public combustion chamber and a plurality of heat storage groups.Among the figure, [21] are public combustion chambers, and [22] are in numerous valves; [23], [24], [25] and [26] are respectively in a plurality of heat storage groups, [27] are the gas mains of treating preheating, [28] are the gas mains after the preheating; [29] be the combustion air house steward who treats preheating; [30] be combustion air house steward after the preheating, [31] are useless flue gas discharge manifolds, and [32] are the burners of combustion chamber etc.The working process of this heat exchanger is such, under original state, reserve necessary exhaust gases passes after; Make all the other valves place the position of complete shut-down; After the burner [32] of combustion chamber started, the temperature of public combustion chamber [21] was able to rapid raising, at this moment; Change the keying state of related valve, high-temperature flue gas can pass through any one heat storage group.If heat only through heat storage group [23] and [25], and to this heat storage group; When this heat storage group is heated to the temperature of regulation; Switch the passage of high-temperature flue gas; Make it to get into heat storage group [24] and [26], at this moment, the keying state of the related valve in adjustment coal gas and the combustion air device; Make the coal gas of treating preheating and combustion air gets into heat storage group [23] respectively and heat [25], be sent to the main burner of hotblast stove then.When the temperature of heat storage group [23] and [25] descends and after the temperature of heat storage group [24] and [26] rises to the numerical value of expection, again with its mutual switching.So constantly hocket, to realize the function of thermal exchange.
In addition, in the system of preheating gas, go back the explosion-proof problem of considered.
The valve of numerous separations among Figure 10 can be used the Several combination valve instead and replace, and for example, 2 independent valve among the figure in each circle can be replaced etc. by a two position three-way valve, and are further again, can also use the higher valve of integrated level etc.
Fig. 7 is the structure diagram of the funtion part of employed a kind of Gas mixing valve [6] in embodiment two, and it has adopted the scheme of high and low temperature inlet mouth interlock control.Among the figure, [13] are valve casings, and [14] are the valve plates that in locating slot [15], moves, and [16] are low wet inlets, and [17] are the High Temperature Gas inlets, and [18] are the outlets of gas mixture.Note that the outer extension member that stretches out the outside bar subordinate Yu Benfa of valve of valve casing [13] and valve plate [14], should be provided with tightness system here,, do not represent in the drawings because this belongs to routine techniques.Under shown position, High Temperature Gas inlet [17] is in full-gear, and low wet inlet [16] then is in complete shut-down.Along with by the moving down gradually of the valve plate [14] handled, the opening degree of High Temperature Gas inlet [17] just diminishes gradually, until being zero; On the contrary, along with moving down gradually of the valve plate of being handled [14], the opening degree of low wet inlet [16] just becomes big from zero gradually, until standard-sized sheet.In theory, high and low temperature gas can be realized the mixing of arbitrary proportion, like this, just can realize that the temperature of gas mixture is adjustable arbitrarily between the temperature of high and low temperature gas self.In order to guarantee the temperature according with process requirements of gas mixture, can adopt temperature measuring equipment to measure the temperature of gas mixture, and according to this as the foundation to the Gas mixing valve adjustment.As for the adjustment to Gas mixing valve, except can adopting the artificial adjustment of monitoring in real time, preferably adopting with the design temperature is the autocontrol method of target, because this method belongs to mature technology in automation field, just no longer adds to have explained at this.
Fig. 8 is the structure diagram of the funtion part of employed another kind of Gas mixing valve [6] in embodiment two, and it has also adopted the scheme of high and low temperature inlet mouth interlock control.Among the figure, [19] are the valve plates that can make reciprocally swinging, and the implication of other label then implication with the label shown in Fig. 7 is identical.Under shown position, High Temperature Gas inlet [17] is in full-gear, and low wet inlet [16] then is in complete shut-down.When by the valve plate [19] handled when opposite side swing, the opening degree of High Temperature Gas inlet [17] just diminishes gradually, until being zero; On the contrary, along with the swing gradually of the slide plate of being handled [19], the opening degree of low wet inlet [16] just becomes big from zero gradually, until standard-sized sheet.Valve plate [19] is to carry out radial and axial localizedly through its rotating shaft, specifically can realize through the axis hole and the additional structure on this of its rotating shaft; In addition, the rotating shaft of valve plate [19] also belongs to the outer extension member of this valve, also tightness system should be set between it and its housing [13]; But,, thereby do not illustrate in the drawings in view of these all are ordinary technology.Along with the swing of valve plate [19], in theory, high and low temperature gas can be realized the mixing of arbitrary proportion.The temperature that can realize gas mixture like this, equally is adjustable arbitrarily between the temperature of high and low temperature gas self.In order to guarantee the temperature according with process requirements of gas mixture, also can adopt temperature measuring equipment to measure the temperature of gas mixture, and according to this as the foundation to the Gas mixing valve adjustment.As for the adjustment to Gas mixing valve, except can adopting the artificial adjustment of monitoring in real time, preferably adopting with the design temperature is the autocontrol method of target, because this method belongs to mature technology in automation field, just no longer adds to have explained at this.
What need to specify a bit is, embodiment one and below in the system described in the embodiment three that will propose, also can adopt Gas mixing valve [6].When using the heat exchanger of non-stop run, adopted after the Gas mixing valve [6], can obtain the quick-adjustsing effect of the temperature of gas mixture.
Fig. 9 is the structure iron of embodiment three.Wherein, [33] are a kind of coal gas and combustion air to be carried out pre-warmed outer heating unit, and [6] are Gas mixing valves, and [7] and [8] are respectively lower combustion gas of temperature and combustion air inlet, and the implication of other label is identical with the implication of the label described in Fig. 1.Specifically, outer heating unit [33] is a kind of combination of heat exchanger with the heat friendship device with public combustion chamber and a plurality of heat storage groups of non-stop run.This outer heating unit [33] is specially adapted to have in the two media a kind of lower situation of Heating temperature of medium; For example; When the desired preheating temperature of coal gas less than, when equaling 800 ℃; Can make its heat exchanger, and let the very high combustion air of desired preheating temperature heat, to strive for obtaining best effect through heat exchange system with high temperature preheating function through non-stop run.
Should be fully clear and definite a bit be that the present invention allows only one of coal gas or combustion air to be heated.Because all the two is considered by heating them simultaneously in above-mentioned each enforcement, therefore, when needs only heat one of coal gas or combustion air, as long as the outer heating unit of removing in that paths that need not heat is just passable.
Embodiment
In practical application, adopt aforesaid method to heat and the whole coal gas employing of the main burner conventional heating in flue place the whole combustion airs of main burner, possibly be optimum.
Claims (6)
1. high temperature hot-blast furnace that is used for blast furnace; It is made up of furnace shell, refractory lining, combustion unit, heat storage, valve and channel system; It is characterized in that; It is provided with to be exclusively used in and increases substantially entering or mix the coal gas of main burner and the outer heating unit of combustion air temperature, and described outer heating unit is the heat exchanger with public combustion chamber and a plurality of heat storage groups.
2. the high temperature hot-blast furnace that is used for blast furnace as claimed in claim 1 is characterized in that, described outer heating unit is the heat exchanger of non-stop run.
3. according to claim 1 or claim 2 the high temperature hot-blast furnace that is used for blast furnace is characterized in that it is provided with Gas mixing valve.
4. the high temperature hot-blast furnace that is used for blast furnace as claimed in claim 3; It is characterized in that, described Gas mixing valve by comprise low wet inlet, High Temperature Gas inlet, mixed gas outlet, to outer extension member have sealing function valve casing and steerable, have positioning function, can form through the valve plate that shift in position is adjusted mixture temperature.
5. the high temperature hot-blast furnace that is used for blast furnace as claimed in claim 2 is characterized in that, in its heat exchanger of non-stop run, is provided with heat-accumulating burner.
6. the high temperature hot-blast furnace that is used for blast furnace as claimed in claim 1 is characterized in that, the waste gas of outer heating unit can be incorporated waste gas of hot-blast stove flue into and be connected in series residual heat using device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410033158 CN1626681B (en) | 2003-12-08 | 2004-04-08 | High temperature hot blast furnace |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200310121918 | 2003-12-08 | ||
| CN200310121918.3 | 2003-12-08 | ||
| CN 200410033158 CN1626681B (en) | 2003-12-08 | 2004-04-08 | High temperature hot blast furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1626681A CN1626681A (en) | 2005-06-15 |
| CN1626681B true CN1626681B (en) | 2012-08-22 |
Family
ID=34796323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410033158 Expired - Fee Related CN1626681B (en) | 2003-12-08 | 2004-04-08 | High temperature hot blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1626681B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101974660B (en) * | 2010-11-26 | 2012-08-15 | 中冶赛迪工程技术股份有限公司 | Cofiring-type hot blast stove |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2054508U (en) * | 1989-03-20 | 1990-03-14 | 王剑平 | Turbid water dual-purpose valve |
| CN1276433A (en) * | 2000-06-20 | 2000-12-13 | 侯长连 | High-air temp hot-blast stove for blast furnace |
-
2004
- 2004-04-08 CN CN 200410033158 patent/CN1626681B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2054508U (en) * | 1989-03-20 | 1990-03-14 | 王剑平 | Turbid water dual-purpose valve |
| CN1276433A (en) * | 2000-06-20 | 2000-12-13 | 侯长连 | High-air temp hot-blast stove for blast furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1626681A (en) | 2005-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102878817A (en) | Continuous combusting regenerative industrial furnace | |
| CN102947648A (en) | A flue having an adjustable flue gas flow unit having an optional integrated heat exchanger as a heat generator coupled in parallel | |
| CN102818257A (en) | Heat accumulating type direct-fired boiler using biomass fuel | |
| CN200989723Y (en) | Mine hot air supply system | |
| CN103673592B (en) | The method and system of the combustion gas of a kind of preheating, sintering, igniting stove in parallel and combustion air | |
| CN101430089B (en) | Low-temperature initiation means of catalyst combustion device | |
| CN203273907U (en) | Combustion air system of large-scale household garbage incinerator | |
| CN203687075U (en) | Primary air system of coal mill of thermal power plant | |
| CN1626681B (en) | High temperature hot blast furnace | |
| CN202793046U (en) | Continuous burning heat accumulating type industrial furnace | |
| CN107559812A (en) | Modular multistage phase-change heat-storage high-temperature air burning energy saver | |
| CN107559877A (en) | Multipurpose modular multistage phase-change heat-storage high-temperature air burning energy saver | |
| CN201945175U (en) | Multiple-effect integrated pipe type heating furnace | |
| CN2705464Y (en) | High temperature hot-air furnace | |
| CN201155919Y (en) | Cement rotary kiln using coal gas as fuel | |
| CN217402599U (en) | Air preheater divides adjustable air supply of pipeline to preheat system | |
| CN107723006A (en) | A kind of heater and technique of long flame dry distillation of coal complete alternation gas | |
| CN210481213U (en) | Electric lime kiln | |
| CN207525187U (en) | A kind of heating unit of long flame dry distillation of coal complete alternation gas | |
| CN209284111U (en) | A kind of food baking system | |
| CN206425543U (en) | A kind of big bag roaster | |
| CN201149427Y (en) | Heat-accumulation heat-exchange type heating furnace | |
| CN215175186U (en) | High-temperature flue gas heat exchange system of oxidation-reduction reaction furnace | |
| CN203880710U (en) | Preheating type combustor for industrial kilns and furnaces | |
| CN202116576U (en) | Preheating structure for hot blast stove combustion gas |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120822 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |