CN102588994B - Boiler-gas mixed-combustion gas supply pipe and gas supply method - Google Patents
Boiler-gas mixed-combustion gas supply pipe and gas supply method Download PDFInfo
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- CN102588994B CN102588994B CN201110007503.8A CN201110007503A CN102588994B CN 102588994 B CN102588994 B CN 102588994B CN 201110007503 A CN201110007503 A CN 201110007503A CN 102588994 B CN102588994 B CN 102588994B
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- 239000007789 gas Substances 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000567 combustion gas Substances 0.000 title abstract description 6
- 239000003034 coal gas Substances 0.000 claims abstract description 127
- 238000002156 mixing Methods 0.000 claims abstract description 90
- 238000002485 combustion reaction Methods 0.000 claims abstract description 42
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 27
- 239000003546 flue gas Substances 0.000 claims description 27
- 239000006227 byproduct Substances 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 239000003245 coal Substances 0.000 abstract 2
- 239000000446 fuel Substances 0.000 description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Abstract
The invention relates to a boiler-gas mixed-combustion gas supply pipe which comprises a gas supply pipe body of a main coal gas supply pipeline (1) and a blending coal gas supply pipeline (2), wherein the mixing coal gas supply pipeline (2) is connected with the middle part of the main coal gas supply pipeline (1) in a mode of gas seal. A water-sealed valve (3) and a mixed coal gas flow regulating valve (5) are arranged on the main coal gas supply pipeline, and a blending coal gas flow regulating valve (4) is arranged on the mixing coal gas supply pipeline. The inner part of the main coal gas supply pipeline is also provided with a plurality of guide plates (6). The invention also discloses a gas supply method based on the boiler-gas mixed-combustion gas supply pipe. According to the gas supply pipe and the gas supply method, under the premise that the original combustion system and combustion equipment of a gas fired-boiler are not changed, the gas fired-boiler is changed from single combustion of blast-furnace gas into mixed combustion of various coal gases in a mode of direct pipeline mixing. Parts meet the requirement of stable operation of the boiler, other by-product coal gases are fully utilized, and secondary energy sources are fully utilized.
Description
Technical field
The present invention relates to a kind of to the air mixture air supply pipe of burning boiler air feed and vent method, belong to air feed heating field.Be specially adapted to the various boiler air feed in producing to iron and steel enterprise.
Background technology
Iron and steel enterprise in process of production, produces the by-product gas such as a large amount of blast furnaces, converter, coke-stove gas.Wherein blast furnace gas because of calorific value lower, combustion instability, is more difficult to get always and makes full use of.In recent years, along with the continuous progress of technology, be that the gas fired-boiler of fuel is developed and is used widely with low combustion value furnace gas.The application of this kind of boiler, make use of the low-calorie blast furnace gas of iron and steel enterprise in a large number, what improve enterprise's secondary energy sources utilizes level.Because the generation of blast furnace gas affects comparatively large by blast fumance, therefore, gas fired-boiler many employings heavy oil or natural gas as the auxiliary fuel of security personnel or steady combustion, the steady production of boiler during to guarantee that blast furnace gas calorific value is unstable or under-supply.But due to heavy oil and gas cost higher, oil, autogenous cutting change comparatively complicated, add factors such as being unfavorable for environmental protection, with heavy oil or natural gas for security measures bring many difficulties to the operation of boiler, operation.
On the other hand, due in Production Process for Steel Enterprise, not only produce a large amount of blast furnace gases, also produce a large amount of converters, coke-stove gas, how to make full use of these secondary energy sources, realize the energy-saving and emission-reduction of enterprise, need enterprise to take necessary technological means to improve constantly the recycling level of these by-product gas.
Disclosed Chinese Patent Application No. is: CN200910243176.9, name is called: in a kind of patent document of three-gas mixed burning volume regulating method for gas boiler, disclose a kind of three-gas mixed burning volume regulating method for gas boiler, the burner combustion device of its application is spiral-flow type structure, air and flow in fuel are through the ejection of guiding swirl vane, lighted after entrainmenting high-temperature flue gas and smooth combustion, burner divides four layers, outermost layer hot-air, second layer fuel gas with low heat value, the combustion gas of third layer medium Btu is finally high heating value combustion gas and automatic ignition device, combustion gas use amount increases with burner radius and increases progressively, specified adjustment is made by the change of fuel mass and supply, when a certain fuel mass or supply change, correspondingly remaining two kinds of fuel is made to the adjustment of furnace entering volume, for there is quality of steam in check index, fire box temperature, exhaust gas temperature, oxygen content of smoke gas load boiler canonical parameter, controling parameters is as follows: in the middle of, low calorie fuels supply is unstable, when having fluctuation, the parameter controlled is: fuel gas with low heat value consumption is share 85% ~ 90% in total amount of fuel, medium calorific value gas 10.2% ~ 15%, exotic fuels consumption controls 0 ~ 0.15%, when the not good and middle combustion value fuel supply discontinuity of fuel gas with low heat value quality, the parameter of control is: fuel gas with low heat value consumption 90% ~ 99%, natural gas consumption≤1%.
The shortcoming of this patent is to realize three gas multifuel combustions, and need to change boiler-burner into four-layer structure, boiler existing equipment must be changed.Simultaneously, on design parameter controls, just comparatively wide in range according in, low heat value supply is unstable or quality is not good situation sets the proportion of various coal gas, the method cannot carry out fine adjustment according to the different load of boiler or boiler oil total amount, also according to the main coal gas amount of blending gas supply amount size fine adjustment, thus the smooth combustion of boiler cannot be ensured.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of boiler flue gas mixed combustion air supply pipe, and it does not need to improve boiler existing equipment, just can realize carrying out air mixture air feed to boiler.
Another technical problem that the present invention will solve is: provide a kind of boiler flue gas mixed combustion air supply method, it more accurately can control the flow of main coal gas and blending coal gas.Thus when realizing main coal gas deficiency on the one hand, the stable operation of boiler; On the other hand, by carrying out air mixture burning to boiler, effectively utilizing the by-product gas that enterprise is more than needed, improving secondary energy sources and recycling level.
In order to solve the problems of the technologies described above, the invention provides a kind of boiler flue gas mixed combustion air supply pipe, it comprises gas supply body, this gas supply body comprises main coal gas steam line and blending coal gas steam line, and described blending coal gas steam line is connected with hermetic seal in the middle part of main coal gas steam line; At the air inlet of described main coal gas steam line be provided with water-sealed valve between described blending coal gas steam line and main coal gas steam line junction, described blending coal gas steam line is provided with blending gas flow control valve, the main coal gas steam line after described blending coal gas steam line and main coal gas steam line junction is provided with mixed gas flow control valve.
According to boiler flue gas mixed combustion air supply pipe of the present invention, be preferably, the main coal gas steam line inside after described blending coal gas steam line and main coal gas steam line junction is provided with polylith deflector.
According to boiler flue gas mixed combustion air supply pipe of the present invention, be preferably, described deflector is fixed on described main coal gas steam line inwall brokenly.
According to boiler flue gas mixed combustion air supply pipe of the present invention, be preferably, the angular range of described deflector place straight line and described main coal gas steam line internal face is 30 ~ 60 °.
According to boiler flue gas mixed combustion air supply pipe of the present invention, be preferably, the length of described deflector is 2/51/2 of described main coal gas steam line internal diameter.
A kind of boiler flue gas mixed combustion air supply method, it adopts aforementioned boiler flue gas mixed combustion air supply pipe to carry out air feed to gas fired-boiler, and in described blending coal gas steam line, gas pressure is 1.1 ~ 1.2 times of gas pressure in described main coal gas steam line.Wherein, the flow of the main coal gas in described main coal gas steam line and the blending coal gas in blending coal gas steam line meets following formula and requires: V
1× Q
1+ V
2× Q
2=(V
1+ V
2) × Q
m
In above formula: V
1, Q
1be respectively main gas flow, calorific value;
V
2, Q
2be respectively blending gas flow, calorific value;
Q
mfor mixed gas calorific value, Q
m≤ 1.2Q
1.
According to boiler flue gas mixed combustion air supply method of the present invention, be preferably, when boiler is lower than 100% load operation, described blending gas flow V
2according to main gas flow V
1setting, its computing formula is:
V
2＝25KV
0/Q
2
Wherein: V
0for coal gas design hour demand main during gas fired-boiler 100% load;
V
2for blending gas flow;
K is coal gas blending coefficient;
Q
2for blending coal gas Lower heat value;
The following value of above-mentioned coal gas blending COEFFICIENT K:
Work as V
1< 0.4V
0time, blending valve is forbidden to open, i.e. K=0;
Work as 0.4V
0< V
1< 0.5V
0time, K=1;
Work as 0.5V
0< V
1< 0.6V
0time, K=3;
Work as 0.6V
0< V
1< 0.75V
0time, K=5;
Work as 0.75V
0< V
1< 0.95V
0time, K=8.
According to boiler flue gas mixed combustion air supply method of the present invention, be preferably, when boiler 100% load operation, according to blending gas flow V
2set main gas flow V
1, its computing formula is:
V
1＝V
0-(Q
2/Q
1)×V
2
Wherein: V
0for coal gas design requirement total amount main during gas fired-boiler 100% load;
V
1it is main gas flow;
V
2for blending gas flow;
Q
1, Q
2be respectively main coal gas and blending coal gas Lower heat value.
Boiler flue gas mixed combustion air supply pipe of the present invention and air supply method, it is under the prerequisite not changing the original combustion system of gas fired-boiler and combustion apparatus, in the mode that direct pipeline mixes, the gas fired-boiler of single burning blast-furnace gas is changed into various kinds of coal gas mixed gas burning (blending coal gas can, according to actual conditions, can be coal gas of converter or coke-stove gas).Simultaneously, according to the accurate control of boiler oil injected volume under different boiler load, the control of various gas pressure, realize the mixed combustion of boiler, meet the demand of stable operation of the boiler on the one hand, utilize the different coal gas mixed combustions of gas fired-boiler on the other hand, make full use of other by-product gas, realize making full use of of secondary energy sources.
Accompanying drawing explanation
Fig. 1 is the structural representation of boiler flue gas mixed combustion air supply pipe of the present invention.
Detailed description of the invention
Below, for a more detailed description to the present invention by reference to the accompanying drawings by embodiment.These embodiments are only the descriptions to best mode for carrying out the invention, do not have any restriction to scope of the present invention.
Embodiment
As shown in Figure 1, described boiler flue gas mixed combustion air supply pipe comprises gas supply body, this gas supply body comprises main coal gas steam line 1 and blending coal gas steam line 2, described blending coal gas steam line is connected with hermetic seal in the middle part of main coal gas steam line, forms a branch road of main coal gas steam line.At the air inlet of described main coal gas steam line 1 be provided with water-sealed valve 3 between described blending coal gas steam line 2 and main coal gas steam line junction.Described blending coal gas steam line 2 is provided with blending gas flow control valve 4, the main coal gas steam line 1 after described blending coal gas steam line 2 with main coal gas steam line 3 junction is provided with mixed gas flow control valve 5.This mixed gas flow control valve 5 one aspect controls mixed gas flow, on the other hand, by interlocking with blending gas flow control valve 4, controls blending gas flow.
Preferably, main coal gas steam line inside after described blending coal gas steam line and main coal gas steam line junction is provided with polylith deflector 6, this deflector 6 can be fixed on described main coal gas steam line inwall brokenly, the angular range of itself and main coal gas steam line internal face is 30 ~ 60 °, and the length of this deflector is 2/5 ~ 1/2 of described main coal gas steam line internal diameter.After this ensure that coal gas mixing, abundant disturbance, forms turbulent flow, thus realizes the abundant mixing of coal gas.
A kind of boiler flue gas mixed combustion air supply method, it adopts aforementioned boiler flue gas mixed combustion air supply pipe to carry out air feed to gas fired-boiler, and in described blending coal gas steam line, gas pressure is 1.1 ~ 1.2 times of gas pressure in described main coal gas steam line.Wherein, the flow of the main coal gas in described main coal gas steam line and the blending coal gas in blending coal gas steam line meets following formula and requires: V
1× Q
1+ V
2× Q
2=(V
1+ V
2) × Q
m
In above formula: V
1, Q
1be respectively main gas flow, calorific value;
V
2, Q
2be respectively blending gas flow, calorific value;
Q
mfor mixed gas calorific value, Q
m≤ 1.2Q
1.
Preferably, when boiler is lower than 100% load operation, described blending gas flow V
2according to main gas flow V
1setting, its computing formula is:
V
2＝25KV
0/Q
2
Wherein: V
0for coal gas design hour demand main during gas fired-boiler 100% load;
V
2for blending gas flow;
K is coal gas blending coefficient;
Q
2for blending coal gas Lower heat value;
The following value of above-mentioned coal gas blending COEFFICIENT K:
Work as V
1< 0.4V
0time, blending valve is forbidden to open, i.e. K=0;
Work as 0.4V
0< V
1< 0.5V
0time, K=1;
Work as 0.5V
0< V
1< 0.6V
0time, K=3;
Work as 0.6V
0< V
1< 0.75V
0time, K=5;
Work as 0.75V
0< V
1< 0.95V
0time, K=8.
When boiler 100% load operation, according to blending gas flow V
2set main gas flow V
1, its computing formula is: V
1=V
0-(Q
2/ Q
1) × V
2
Wherein: V
0for coal gas design requirement total amount main during gas fired-boiler 100% load;
V
1it is main gas flow;
V
2for blending gas flow;
Q
1, Q
2be respectively main coal gas and blending coal gas Lower heat value.
For 75t/h gas fired-boiler, introduce described boiler flue gas mixed combustion air supply pipe and air supply method in detail:
(1) when boiler is lower than 100% load operation
When blast furnace gas is under-supply, or coal gas of converter is had more than needed, and when needing to regulate digestion, boiler room obtains dispatch command, needs blending coal gas of converter.Now, control coal gas of converter pressure and be not less than 11kPa, regulate mixed gas flow control valve F
2(F
2join trivial with blending gas flow control valve F1), now, F
2flow signal is fed back to F
1, F
1then carry out action, self-regulating rotary producer gas flow according to the control logic of setting.Coal gas of converter mixes with blast furnace gas after entering blast furnace gas main pipeline, and mixed gas is after deflector, and abundant disturbance, after forming turbulent flow, passes through F
2after enter burner.Blending procedure terminates.According to blending formula, coal gas of converter blending amount controls as follows:
Total amount of fuel 30,000 m
3during/h, coal gas of converter blending amount should control at 1000m
3/ h;
Total amount of fuel 40,000 m
3during/h, coal gas of converter blending amount should control at 3000m
3/ h;
Total amount of fuel 50,000 m
3during/h, coal gas of converter blending amount should control at 5000m
3/ h;
Total amount of fuel 60,000 m
3during/h, coal gas of converter blending amount should control at 8000m
3/ h;
(2) when boiler runs at full capacity
Due to need of production, when needing blending coal gas of converter, control coal gas of converter pressure and be not less than 11kPa, regulate mixed gas flow control valve F
2(F
2with blending gas flow control valve F
1join trivial), now, F
2flow signal is fed back to F
1, F
1then carry out action, self-regulating rotary producer gas flow according to the control logic of setting.Coal gas of converter mixes with blast furnace gas after entering blast furnace gas main pipeline, and mixed gas is after deflector, and abundant disturbance, after forming turbulent flow, passes through F
2after enter burner.Blending procedure terminates.According to blending formula, coal gas of converter blending amount controls as follows:
Coal gas of converter blending amount is 1000m
3during/h, BFG injected volume should control at 75000m
3/ h;
Coal gas of converter blending amount is at 2000m
3during/h, BFG injected volume should control at 70000m
3/ h;
Coal gas of converter blending amount is at 4000m
3during/h, BFG injected volume should control at 65000m
3/ h;
Coal gas of converter blending amount is at 6000m
3during/h, BFG injected volume should control at 60000m
3/ h;
Coal gas of converter blending amount is at 8000m
3during/h, BFG injected volume should control at 55000m
3/ h.
Claims (5)
1. a boiler flue gas mixed combustion air supply method, is characterized in that: adopt following boiler flue gas mixed combustion air supply pipe to carry out air feed to gas fired-boiler,
Described boiler flue gas mixed combustion air supply pipe, comprise gas supply body, it is characterized in that: described gas supply body comprises main coal gas steam line and blending coal gas steam line, described blending coal gas steam line is connected with hermetic seal in the middle part of main coal gas steam line;
At the air inlet of described main coal gas steam line be provided with water-sealed valve between described blending coal gas steam line and main coal gas steam line junction, described blending coal gas steam line is provided with blending gas flow control valve, main coal gas steam line after described blending coal gas steam line and main coal gas steam line junction is provided with mixed gas flow control valve
In described blending coal gas steam line, gas pressure is 1.1 ~ 1.2 times of gas pressure in described main coal gas steam line;
The flow of the main coal gas in described main coal gas steam line and the blending coal gas in blending coal gas steam line meets following formula and requires: V
1× Q
1+ V
2× Q
2=(V
1+ V
2) × Q
m
In above formula: V
1, Q
1be respectively main gas flow, Lower heat value;
V
2, Q
2be respectively blending gas flow, Lower heat value;
Q
mfor mixed gas calorific value, Q
m≤ 1.2Q
1,
When boiler is lower than 100% load operation, described blending gas flow V
2according to main gas flow V
1setting,
Its computing formula is:
V
2＝25KV
0/Q
2
Wherein: V
0for coal gas design hour demand main during gas fired-boiler 100% load;
V
2for blending gas flow;
K is coal gas blending coefficient;
Q
2for blending coal gas Lower heat value;
Wherein, the following value of coal gas blending COEFFICIENT K:
Work as V
1<0.4V
0time, blending valve is forbidden to open, i.e. K=0;
Work as 0.4V
0<V
1<0.5V
0time, K=1;
Work as 0.5V
0<V
1<0.6V
0time, K=3;
Work as 0.6V
0<V
1<0.75V
0time, K=5;
Work as 0.75V
0<V
1<0.95V
0time, K=8,
Or when boiler 100% load operation, according to blending gas flow V
2set main gas flow V
1,
Its computing formula is:
V
1＝V
0-(Q
2/Q
1)×V
2
Wherein: V
0for coal gas design requirement total amount main during gas fired-boiler 100% load;
V
1it is main gas flow;
V
2for blending gas flow.
2. for a boiler flue gas mixed combustion air supply pipe for boiler flue gas mixed combustion air supply method according to claim 1, it is characterized in that: the main coal gas steam line inside after described blending coal gas steam line and main coal gas steam line junction is provided with polylith deflector.
3. boiler flue gas mixed combustion air supply pipe according to claim 2, is characterized in that: described deflector is fixed on described main coal gas steam line inwall brokenly.
4. the boiler flue gas mixed combustion air supply pipe according to Claims 2 or 3, is characterized in that: the angular range of described deflector place straight line and described main coal gas steam line internal face is 30 ~ 60 °.
5. the boiler flue gas mixed combustion air supply pipe according to Claims 2 or 3, is characterized in that: the length of described deflector is 2/5 ~ 1/2 of described main coal gas steam line internal diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110007503.8A CN102588994B (en) | 2011-01-14 | 2011-01-14 | Boiler-gas mixed-combustion gas supply pipe and gas supply method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110007503.8A CN102588994B (en) | 2011-01-14 | 2011-01-14 | Boiler-gas mixed-combustion gas supply pipe and gas supply method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102588994A CN102588994A (en) | 2012-07-18 |
| CN102588994B true CN102588994B (en) | 2015-01-21 |
Family
ID=46478019
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110007503.8A Expired - Fee Related CN102588994B (en) | 2011-01-14 | 2011-01-14 | Boiler-gas mixed-combustion gas supply pipe and gas supply method |
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| Country | Link |
|---|---|
| CN (1) | CN102588994B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994661B (en) * | 2014-06-10 | 2016-06-08 | 济钢集团有限公司 | Burning gas fitting joined by a kind of sinter machine |
| CN104964305B (en) * | 2015-03-06 | 2018-08-17 | 上海浩用工业炉有限公司 | A kind of tubular heater low calorie fuels gas stabilization combustion method |
| CN110701485A (en) * | 2019-10-12 | 2020-01-17 | 青海盐湖工业股份有限公司 | Recycling method and system of fuel gas of methanol-to-olefin device byproduct |
| CN114249548B (en) * | 2021-12-15 | 2022-11-08 | 广西柳州钢铁集团有限公司 | Method for stably blending fuel in gas double-hearth kiln |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1312147A (en) * | 1919-08-05 | Josiah mowek wallwilir | ||
| CN1062919A (en) * | 1991-01-03 | 1992-07-22 | 山西太原钢铁公司 | The method of control calorific value pressure of mixed gases |
| CN101482732A (en) * | 2008-01-08 | 2009-07-15 | 鞍钢股份有限公司 | Mixed gas calorific value stabilization control method |
| CN101709346A (en) * | 2009-12-25 | 2010-05-19 | 重庆科技学院 | High coke oven gas mixing air supply device of blast furnace hot blast system |
| CN101776280A (en) * | 2009-12-31 | 2010-07-14 | 秦皇岛首秦金属材料有限公司 | Three-gas mixed burning volume regulating method for gas boiler |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009216334A (en) * | 2008-03-12 | 2009-09-24 | Chugoku Electric Power Co Inc:The | Fuel gas feeder for thermal power plant |
-
2011
- 2011-01-14 CN CN201110007503.8A patent/CN102588994B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1312147A (en) * | 1919-08-05 | Josiah mowek wallwilir | ||
| CN1062919A (en) * | 1991-01-03 | 1992-07-22 | 山西太原钢铁公司 | The method of control calorific value pressure of mixed gases |
| CN101482732A (en) * | 2008-01-08 | 2009-07-15 | 鞍钢股份有限公司 | Mixed gas calorific value stabilization control method |
| CN101709346A (en) * | 2009-12-25 | 2010-05-19 | 重庆科技学院 | High coke oven gas mixing air supply device of blast furnace hot blast system |
| CN101776280A (en) * | 2009-12-31 | 2010-07-14 | 秦皇岛首秦金属材料有限公司 | Three-gas mixed burning volume regulating method for gas boiler |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2009-216334A 2009.09.24 * |
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|---|---|
| CN102588994A (en) | 2012-07-18 |
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