CN103981319A - Hot blast stove system and combustion control method thereof - Google Patents
Hot blast stove system and combustion control method thereof Download PDFInfo
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- CN103981319A CN103981319A CN201410227557.9A CN201410227557A CN103981319A CN 103981319 A CN103981319 A CN 103981319A CN 201410227557 A CN201410227557 A CN 201410227557A CN 103981319 A CN103981319 A CN 103981319A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
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Abstract
The invention provides a hot blast stove system. The combustion air is controlled by two valves (a flow-rate adjusting valve and an oxygen volume adjusting valve), the flow-rate adjusting valve can precisely adjust the ratio of the air and the combustion natural gas to be 15:1 so as to guarantee the sufficient combustion of the combustion natural gas; the oxygen volume adjusting valve controls the hot-blast oxygen volume entering the system to be less than 1 percent according to the feedback of an oxygen volume measuring point, so that not only can sufficient oxygen be supplied to the combustion of low-temperature pyrolysis gas, but also the system hot-air inert atmosphere can be maintained, and the spontaneous combustion and explosive risk of the drying and pyrolysis process of the crude coal can be prevented. The weakness of the combustion of the hot blast stove in the prior art can be overcome.
Description
Technical field
The present invention relates generally to a kind of improved hot blast stove system and corresponding method for controlling combustion thereof.
Background technology
Brown coal are pit coals that degree of coalification is minimum, a kind of brownish black, lacklustre grizzle between peat and pitch coal.Be rich in volatile matter, be easy to burn and smolder.Brown coal are due to high-moisture, high-volatile, low heat value, and the feature of spontaneous combustion very easily, thus be unsuitable for standing storage and long-distance transportation, be considered for a long time a kind of low-grade coal resource, only be used as at present near coal-mine Power Plant Fuel and near coal-mine gasified raw material, limited the rational exploitation and utilization of lignite resource.How Efficient Conversion utilizes the low-rank coal such as brown coal just to become a major issue of coal utilization.Wherein the most interestingly brown coal are converted into relatively clean liquid fuel.Effective comprehensive utilization of brown coal becomes in recent years a popular research and has the field of DEVELOPMENT PROSPECT.
At present, the equipment of Combustion of Hot Air Furnace technology is more both at home and abroad, mainly contains following several:
Top burning type hot blast stove combustor and control method thereof (patent No. CN1254761A) the present invention is a kind of for extending ventilation cooling device and the control method thereof in top burning type hot blast stove combustor life-span, belongs to the ironmaking technology field in Iron And Steel Industry.The present invention establishes a logical cold wind endless tube on the combustion air endless tube of existing top combustion stove, and described logical cold wind endless tube is connected with cold blast pipeline by logical cold air duct, on logical cold air duct, is provided with logical cold wind intercepting valve and logical cold air adjusting valve.The control method of the logical cold air refrigerating device of top burning type hot blast stove combustor provided by the invention, can realize neither allowing hot blast enter burner not allow again too much cold wind enter the object that top combustion stove affects wind-warm syndrome.
A kind of combustion engine for hot blast stove of combustion engine for hot blast stove (patent No. CN201787574U), is comprised of casing, burner, gas blower.Install combustion device and gas blower in casing, burner is pre-mixing gas combustion burner, by housing, premixer, gas blower Link Port, combustion gas Link Port, burner plate, combustion chamber, formed, housing by one end, combustion chamber stretches out outside casing together with combustion chamber, and hotblast stove fire door is stretched into together with the housing outside casing in combustion chamber.The combustion air of combustion gas and gas blower output enters premixer simultaneously, after the pre-mixing before burning, through burner plate, enters combustion chambers burn, and flame is sprayed to burner hearth by fire door.Because have, the fresh combustion-supporting wind regime of gas blower continues, fair supply in combustion gas, the pre-mixing of Geng Youjing premixer before burning, and sufficient combustion is thorough, and thermo-efficiency is high.
The shortcoming that above-mentioned Combustion of Hot Air Furnace equipment mainly exists:
In hotblast stove, can for combustion-supporting fresh air, only have the part of fire door inflow, can not meet the combustion-supporting demand of large flow gas far away, cause a large amount of combustion gas just by the heat absorption blower fan of defeated hot system, to be siphoned away without burning, waste the energy, increase oven dry cost;
The pyrolysis gas calorific value producing in the pyrolytic process of coal is low, and hearth of hot-blast stove temperature is low, pyrolysis gas incomplete combustion, and discharge has caused atmospheric pollution.
Summary of the invention
The object of the present invention is to provide a kind of improved hot blast stove system and method for controlling combustion thereof, can overcome the defect of Combustion of Hot Air Furnace in prior art.
To achieve these goals, hot blast stove system of the present invention has adopted following structure: it includes hotblast stove, burner blower, burner, air door, valve, measuring sensor, described hotblast stove includes combustion chamber and the mixing section separating by partition, described burner is arranged on combustion chamber, described burner blower converting operation is accurately controlled combustion air volume, on pipeline between burner blower and burner, be provided with exhaust-valve, between described exhaust-valve and burner, be provided with quick closing damper, after hotblast stove flame failure protection action, this quick closing damper quick closedown, prevent that in stove, oxygen amount rises suddenly, pipeline between described quick closing damper and burner is divided into arranged side by side two, be respectively Flow-rate adjustment pipeline and oxygen flow regulation pipeline, on described Flow-rate adjustment pipeline, be provided with Flow-rate adjustment air door, on described oxygen flow regulation pipeline, be provided with oxygen flow regulation air door, being provided with of described Flow-rate adjustment air door is beneficial to hotblast stove Initial Stage after Ignition accurate adjustment air quantity, meet the requirement of burner blower operation minimum flow rate, avoid burner blower to move at unstable region, regulate the aperture of described Flow-rate adjustment air door, provide enough combustion airs that combustion gas can fully be burnt, described oxygen flow regulation air door is according to oxygen quantity sensor feedback signal, fine adjustment hot blast oxygen level, maintain inert atmosphere, meet subsequent technique needs.
Further, it also includes the quick-closing valve being arranged on combustion-supporting natural gas line hot blast stove system of the present invention, natural gas line between described quick-closing valve and described burner is divided into two, be respectively combustion-supporting natural gas line and igniting natural gas line, on described combustion-supporting natural gas line, be also provided with combustion-supporting natural gas adjusting valve, on described igniting natural gas line, be also provided with igniting natural gas adjusting valve, according to fire box temperature, regulate above-mentioned two valves, remain that fire box temperature is between 800 to 950 degrees Celsius, igniting natural gas adjusting valve is often opened, play pilot burner effect.
Further, the spout of burner is along circumference, combustion-supporting Sweet natural gas is evenly arranged in inner periphery, low heat value pyrolysis gas is evenly arranged in excircle, when chamber temperature declines, open large combustion-supporting natural gas valve, turn down low heat value low temperature pyrogenation air valve, improve chamber temperature, guarantee the warm abundant mixed firing of venting one's spleen of low heat value.
Further, hot blast stove system of the present invention, low heat value pyrolysis gas enters the burner of hotblast stove by pyrolysis gas pipeline, on described pyrolysis gas pipeline, be provided with damper, in the combustion chamber of described hotblast stove, be provided with chamber temperature measuring point, for monitoring chamber temperature, keep chamber temperature between 800 to 950 degrees Celsius, according to the feedback of chamber temperature measuring point, adjust in time the pyrolysis tolerance that enters burner hearth, prevent that the too low hotblast stove of chamber temperature is flame-out.
Further, hot blast stove system of the present invention, mix wind and by mixing wind pipeline, enter the mixing section of hotblast stove, on described mixing wind pipeline, be provided with damper, in the mixing section of described hotblast stove, be provided with system hot blast temperature measuring point, with monitoring, enter system hot blast temperature, make to enter system hot blast temperature and meet that coal is dry, pyrolytic process needs, according to the temperature that enters system hot blast temperature measuring point, show the temperature that accurate adjustment enters system hot blast.
Further, method for controlling combustion corresponding to a kind of and above-mentioned hot-air system, step 1, hotblast stove igniting, by starting burner blower, opens quick closing damper, Sweet natural gas quick-closing valve, turn-on flow rate damper and igniting natural gas adjusting valve, initial igniter igniting; Step 2, hotblast stove heats up, and regulates combustion-supporting natural gas adjusting valve to start to heat up, and adjust flux damper fine adjustment air compares 15:1 with combustion-supporting Sweet natural gas; Step 3, stable burning, when system hot blast temperature reaches after design temperature, regulates mixing wind damper to maintain system hot blast temperature according to system hot blast temperature measuring point feedback temperature stable.
Further, Combustion of Hot Air Furnace control method as above, in step 3, carrying out along with burning, system hot blast temperature can rise, and there is gradually the Low Temperature Thermal generation of venting one's spleen, progressively open described low temperature pyrogenation gas damper, according to chamber temperature measuring point Temperature Feedback, open large combustion-supporting natural gas adjusting valve and Flow-rate adjustment air door guarantees flameholding.
Further, Combustion of Hot Air Furnace control method as above, according to the feedback of oxygen gauge point, by regulating oxygen flow regulation air door control system hot blast oxygen amount below 1%.
Further, Combustion of Hot Air Furnace control method as above, along with the vent one's spleen increase of output of main device Low Temperature Thermal, progressively drive large low temperature pyrogenation gas damper, combustion-supporting natural gas adjusting valve, Flow-rate adjustment air door, oxygen flow regulation air door are to increase hotblast stove thermal load until main device oepration at full load.
Hot blast stove system of the present invention, owing to having adopted two valves to control combustion air (flow control valve and oxygen flow regulation valve), described Flow-rate adjustment air door fine adjustment air than 15:1, guarantees that combustion-supporting Sweet natural gas fully burns with combustion-supporting Sweet natural gas; Described oxygen flow regulation air door is according to the feedback of oxygen gauge point, control enters system hot blast oxygen amount below 1%, enough oxygen is provided can to low temperature pyrogenation gas firing, can maintains again system hot blast inert atmosphere, prevent that raw coal is in dry, pyrolytic process generation spontaneous combustion, risk of explosion.
Adopted after above-mentioned control method, can make chamber temperature maintain all the time more than 800 ℃, to guarantee that low heat value pyrolysis gas fully completes burning, fine adjustment burning combustion air, make oxygen amount can meet the combustion gas needs that fully burn, can maintain hot blast inert atmosphere again, avoid feed coal spontaneous combustion in dry thermal cracking process to occur.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of Combustion of Hot Air Furnace control method of the present invention.
Embodiment
Object for a better understanding of the present invention, below in conjunction with background, accompanying drawing and actual condition, is described in detail hot blast stove system of the present invention and corresponding method for controlling combustion technique thereof.
Hot blast stove system of the present invention includes: hotblast stove 14, burner blower 1, burner 15, a plurality of air doors, a plurality of valves, a plurality of measuring sensors, described hotblast stove 14 includes combustion chamber and the mixing section separating by partition, described burner 15 is arranged at the sidepiece of combustion chamber, described burner blower 1 converting operation is accurately controlled combustion air volume, on pipeline between burner blower 1 and burner 15, be provided with exhaust-valve 2, between described exhaust-valve 2 and burner 15, be provided with quick closing damper 3, after hotblast stove flame failure protection action, these quick closing damper 3 quick closedowns, prevent that in stove, oxygen amount rises suddenly, pipeline between described quick closing damper 3 and burner is divided into arranged side by side two, be respectively Flow-rate adjustment pipeline and oxygen flow regulation pipeline, on described Flow-rate adjustment pipeline, be provided with Flow-rate adjustment air door 4, on described oxygen flow regulation pipeline, be provided with oxygen flow regulation air door 5, being provided with of described Flow-rate adjustment air door 4 is beneficial to hotblast stove Initial Stage after Ignition accurate adjustment air quantity, meet the requirement of burner blower operation minimum flow rate, avoid burner blower to move at unstable region, regulate the aperture of described Flow-rate adjustment air door 4, provide enough combustion airs that combustion gas can fully be burnt, described oxygen flow regulation air door 5 is according to oxygen quantity sensor 12 feedback signals, fine adjustment hot blast oxygen level, maintain inert atmosphere, meet subsequent technique needs.
Combustion-supporting Sweet natural gas enters burner 15 by combustion-supporting natural gas line, on described combustion-supporting natural gas line, establishes quick-closing valve 6, and quick closedown after hotblast stove flame failure protection action prevents that the rear a large amount of Sweet natural gases of fire extinguishing from entering hotblast stove, and then blasts; Natural gas line between described quick-closing valve 6 and described burner 15 is divided into two, be respectively combustion-supporting natural gas line and igniting natural gas line, on described combustion-supporting natural gas line, be also provided with combustion-supporting natural gas adjusting valve 7, on described igniting natural gas line, be also provided with igniting natural gas adjusting valve 8, according to fire box temperature, regulate above-mentioned two valves, remain that fire box temperature is between 800 to 950 degrees Celsius, igniting natural gas adjusting valve 8 is often opened, and plays pilot burner effect.
Low Temperature Thermal is vented one's spleen and by pyrolysis gas pipeline, is entered the combustion chamber of hotblast stove, on described pyrolysis gas pipeline, be provided with damper 9, in the combustion chamber of described hotblast stove, be provided with chamber temperature measuring point 11, be used for monitoring chamber temperature, keep chamber temperature between 800 to 950 degrees Celsius, according to the feedback of chamber temperature measuring point 11, adjust in time the pyrolysis tolerance that enters burner hearth, prevent that the too low hotblast stove of chamber temperature is flame-out; Mix wind and by mixing wind pipeline, enter the mixing section of hotblast stove, on described mixing wind pipeline, be provided with damper 10, in the mixing section of described hotblast stove, be provided with system hot blast temperature measuring point 13, with monitoring, enter system hot blast temperature, make to enter system hot blast temperature and meet that coal is dry, pyrolytic process needs, according to the temperature that enters system hot blast temperature measuring point 13, show the temperature that accurate adjustment enters system hot blast.
Further, described hotblast stove inside is two chambers by building that refractory brick cuts off burner hearth, and anterior combustion chamber maintains sufficiently high temperature (800 ℃～950 ℃), guarantees the Low Temperature Thermal fully burning of venting one's spleen; Rear portion mixing section is by the aperture of adjusting mixing air valve 10, and fine adjustment enters system hot blast temperature (300 ℃～550 ℃), meets that raw coal is dry, pyrolysis needs.
Below in conjunction with the structure of above-mentioned fuel gas hot-blast stove, the detailed method for controlling combustion of introducing this fuel gas hot-blast stove.System nitrogen replacement is complete, and hotblast stove oxygen level, below 1%, starts burner blower 1, opens quick closing damper 3, Sweet natural gas quick-closing valve 6, turn-on flow rate damper 4 and igniting natural gas adjusting valve 8, initial igniter igniting.After combustion chamber catches fire, tuning to open combustion-supporting natural gas adjusting valve 7 starts to heat up, adjust flux damper 4 fine adjustment air compare 15:1 with combustion-supporting Sweet natural gas, when system hot blast temperature reaches after design temperature, according to system hot blast temperature measuring point 13 feedback temperature, regulate mixing wind damper 10 to maintain system hot blast temperature stable.
Along with system hot blast temperature rises, there is gradually the Low Temperature Thermal generation of venting one's spleen, progressively open low temperature pyrogenation gas damper 9, because of the Low Temperature Thermal calorific value of venting one's spleen low, fire box temperature can start to decline, and opens large combustion-supporting natural gas adjusting valve 7 and Flow-rate adjustment air door 4 (maintain all the time air with combustion-supporting Sweet natural gas than 15:1) guarantee flameholding according to chamber temperature measuring point 11 Temperature Feedback.According to the feedback regulation oxygen flow regulation air door 5 Controlling System hot blast oxygen amounts of oxygen gauge point 12 below 1%.Along with the vent one's spleen increase of output of main device Low Temperature Thermal, progressively drive large low temperature pyrogenation gas damper 9 according to the method described above, combustion-supporting natural gas adjusting valve 7, Flow-rate adjustment air door 4, oxygen flow regulation air door are to increase hotblast stove thermal load until main device oepration at full load.
Improved Combustion of Hot Air Furnace control method of the present invention, can make chamber temperature maintain all the time more than 800 ℃, to guarantee that low heat value pyrolysis gas fully completes burning, fine adjustment burning combustion air, make oxygen amount can meet the combustion gas needs that fully burn, can maintain hot blast inert atmosphere again, avoid feed coal spontaneous combustion in dry thermal cracking process to occur.
The above be only hot blast stove system of the present invention with and a kind of embodiment of method for controlling combustion; should be understood that; for those skilled in the relevant art; under the premise without departing from the principles of the invention; trickle modification and the improvement made, also should be considered as belonging to protection scope of the present invention.
Claims (8)
1. a hot blast stove system, it includes hotblast stove (14), burner blower (1), burner (15), air door, measuring sensor, the inside of described hotblast stove (14) is provided with to cut off hotblast stove is divided into combustion chamber and mixing section, and described burner (15) is arranged on combustion chamber; On pipeline between described burner blower (1) and burner (15), be provided with exhaust-valve (2), between described exhaust-valve (2) and burner (15), be provided with quick closing damper (3), after hotblast stove flame failure protection action, this quick closing damper (3) quick closedown, prevents that in stove, oxygen amount rises suddenly; Pipeline between described quick closing damper (3) and burner is divided into arranged side by side two, be respectively Flow-rate adjustment pipeline and oxygen flow regulation pipeline, on described Flow-rate adjustment pipeline, be provided with Flow-rate adjustment air door (4), on described oxygen flow regulation pipeline, be provided with oxygen flow regulation air door (5).
2. hot blast stove system as claimed in claim 1, it also includes the quick-closing valve (6) being arranged on combustion-supporting natural gas line, natural gas line between described quick-closing valve (6) and described burner (15) is divided into two, be respectively combustion-supporting natural gas line and igniting natural gas line, on described combustion-supporting natural gas line, be also provided with combustion-supporting natural gas adjusting valve (7), on described igniting natural gas line, be also provided with igniting natural gas adjusting valve (8), according to fire box temperature, regulate above-mentioned two valves, remain that fire box temperature is between 800 to 950 degrees Celsius, igniting natural gas adjusting valve (8) is often opened, play pilot burner effect.
3. hot blast stove system as claimed in claim 2, pyrolysis gas enters burner by pyrolysis gas pipeline, on described pyrolysis gas pipeline, be provided with damper (9), in the combustion chamber of described hotblast stove, be provided with chamber temperature measuring point (11), be used for monitoring chamber temperature, keep chamber temperature between 800 to 950 degrees Celsius, according to the feedback of chamber temperature measuring point (11), adjust in time the pyrolysis tolerance that enters burner hearth, prevent that the too low hotblast stove of chamber temperature is flame-out.
4. hot blast stove system as claimed in claim 2, mix wind and by mixing wind pipeline, enter the mixing section of hotblast stove, on described mixing wind pipeline, be provided with damper (10), in the mixing section of described hotblast stove, be provided with system hot blast temperature measuring point (13), with monitoring, enter the hot blast temperature of system, make the hot blast temperature of the system of entering meet that coal is dry, pyrolytic process needs, according to the temperature that enters system hot blast temperature measuring point 13, show the temperature that accurate adjustment enters system hot blast.
5. one kind according to the method for controlling combustion of hot-air system described in aforementioned arbitrary claim, step 1, hotblast stove igniting, by starting burner blower (1), open quick closing damper (3), Sweet natural gas quick-closing valve (6), turn-on flow rate damper (4) and igniting natural gas adjusting valve (8), initial igniter igniting; Step 2, hotblast stove heats up, and regulates combustion-supporting natural gas adjusting valve (7) to start to heat up, and adjust flux damper (4) fine adjustment air compares 15:1 with combustion-supporting Sweet natural gas; Step 3, stable burning, when system hot blast temperature reaches after design temperature, regulates mixing wind damper (10) to maintain system hot blast temperature according to system hot blast temperature measuring point (13) feedback temperature stable.
6. Combustion of Hot Air Furnace control method as claimed in claim 5, in step 3, carrying out along with burning, system hot blast temperature can rise, and there is gradually the Low Temperature Thermal generation of venting one's spleen, progressively open described low temperature pyrogenation gas damper (9), according to chamber temperature measuring point (11) Temperature Feedback, open large combustion-supporting natural gas adjusting valve (7) and Flow-rate adjustment air door (4) assurance flameholding.
7. Combustion of Hot Air Furnace control method as claimed in claim 6, according to the feedback of oxygen gauge point (12), by regulating oxygen flow regulation air door (5) Controlling System hot blast oxygen amount below 1%.
8. Combustion of Hot Air Furnace control method as claimed in claim 6, along with the vent one's spleen increase of output of main device Low Temperature Thermal, progressively drive large low temperature pyrogenation gas damper (9), combustion-supporting natural gas adjusting valve (7), Flow-rate adjustment air door (4), oxygen flow regulation air door (5) to increase hotblast stove thermal load until main device oepration at full load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410227557.9A CN103981319B (en) | 2014-05-27 | 2014-05-27 | The method for controlling combustion of a kind of hot blast stove system and correspondence thereof |
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| CN201410227557.9A CN103981319B (en) | 2014-05-27 | 2014-05-27 | The method for controlling combustion of a kind of hot blast stove system and correspondence thereof |
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| CN103981319A true CN103981319A (en) | 2014-08-13 |
| CN103981319B CN103981319B (en) | 2015-12-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805247A (en) * | 2015-05-18 | 2015-07-29 | 上海联达节能科技有限公司 | Energy-saving regulating and controlling method for combustion fan of blast furnace hot blast stove |
| CN105238899A (en) * | 2015-09-30 | 2016-01-13 | 北京首钢国际工程技术有限公司 | Efficient low-emission high-temperature low-oxygen hot blast stove |
| CN106403277A (en) * | 2016-10-20 | 2017-02-15 | 内蒙古京能锡林煤化有限责任公司 | Oxygen-enriched staged combustion hot-blast stove suitable for various fuel sources |
| CN108826353A (en) * | 2018-03-21 | 2018-11-16 | 长沙卡特尔环保科技有限公司 | A kind of combustion-supporting control method of natural gas boiler |
| CN109956640A (en) * | 2019-03-28 | 2019-07-02 | 北京云水浩瑞环境科技有限公司 | The system for handling sludge |
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| CN201678693U (en) * | 2010-03-31 | 2010-12-22 | 宝钢集团新疆八一钢铁有限公司 | Oxygen-enriched blending combustion device of hot blast heater |
| CN103451342A (en) * | 2013-09-05 | 2013-12-18 | 鞍钢股份有限公司 | Device and method for increasing temperature of blast furnace hot air |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1888083A (en) * | 2005-06-27 | 2007-01-03 | 天津天铁冶金集团有限公司 | Hot blast stove burning method |
| CN201678693U (en) * | 2010-03-31 | 2010-12-22 | 宝钢集团新疆八一钢铁有限公司 | Oxygen-enriched blending combustion device of hot blast heater |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104805247A (en) * | 2015-05-18 | 2015-07-29 | 上海联达节能科技有限公司 | Energy-saving regulating and controlling method for combustion fan of blast furnace hot blast stove |
| CN105238899A (en) * | 2015-09-30 | 2016-01-13 | 北京首钢国际工程技术有限公司 | Efficient low-emission high-temperature low-oxygen hot blast stove |
| CN105238899B (en) * | 2015-09-30 | 2017-11-21 | 北京首钢国际工程技术有限公司 | Efficient low-discharging high temperature low oxygen hot blast furnace |
| CN106403277A (en) * | 2016-10-20 | 2017-02-15 | 内蒙古京能锡林煤化有限责任公司 | Oxygen-enriched staged combustion hot-blast stove suitable for various fuel sources |
| CN108826353A (en) * | 2018-03-21 | 2018-11-16 | 长沙卡特尔环保科技有限公司 | A kind of combustion-supporting control method of natural gas boiler |
| CN109956640A (en) * | 2019-03-28 | 2019-07-02 | 北京云水浩瑞环境科技有限公司 | The system for handling sludge |
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| CN103981319B (en) | 2015-12-09 |
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