CN113916014A - Steel rolling heating furnace flue gas recirculation deNOx systems - Google Patents
Steel rolling heating furnace flue gas recirculation deNOx systems Download PDFInfo
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- CN113916014A CN113916014A CN202111186339.1A CN202111186339A CN113916014A CN 113916014 A CN113916014 A CN 113916014A CN 202111186339 A CN202111186339 A CN 202111186339A CN 113916014 A CN113916014 A CN 113916014A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
- F27D17/002—Details of the installations, e.g. fume conduits or seals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/04—Circulating atmospheres by mechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/04—Circulating atmospheres by mechanical means
- F27D2007/045—Fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0012—Monitoring the composition of the atmosphere or of one of their components
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
Abstract
The invention relates to the technical field of emission reduction of industrial flue gas nitrogen oxides, in particular to a steel rolling heating furnace flue gas recirculation denitration system. The system comprises an air-smoke side smoke taking device or a coal-smoke side smoke taking device, a recirculation fan, a PLC (programmable logic controller) and an air-smoke mixer system, wherein the air-smoke side smoke taking device or the coal-smoke side smoke taking device extracts a part of smoke from an air-smoke side or a coal-smoke side flue and then enters the recirculation fan, the smoke flowing through the recirculation fan is sent into the air-smoke mixer and is mixed with air passing through an air feeder and then sent into a steel rolling heating furnace, the effects of temperature reduction of a combustion part and oxygen concentration control can be realized, and therefore the NO is reducedxIs performed. The system recycles the flue gas discharged by the heating furnace and has the function of removing NOxHigh efficiency and good applicationAnd (4) the advantages are realized.
Description
Technical Field
The invention relates to the technical field of emission reduction of industrial flue gas nitrogen oxides, in particular to a steel rolling heating furnace flue gas recirculation denitration system.
Background
The steel rolling heating furnace is one of main production equipment of steel enterprises, and the work content of the steel rolling heating furnace is to heat a steel billet to a rolling temperature suitable for a steel rolling process by using heat generated by fuel combustion. However, the fuel combustion process generates significant amounts of NOxCausing severe photochemical smog and acid rain damage to the environment. In order to further meet the limit requirement of the ultra-low emission standard of the atmospheric pollutants in the steel industry (DB13/2169-xAnd (5) emission reduction treatment.
The flue gas recirculation denitration technology has short construction period and small equipment transformation range, is widely applied to flue gas treatment of gas-fired boilers, but basically does not relate to the field of flue gas treatment of heating furnaces in iron and steel enterprises. On the one hand, the fuel of an industrial gas-fired boiler is natural gas, while the fuel of a steel rolling heating furnace is generally blast furnace gas or converter gas, and the main components and the heat values of the two fuels are different, so that the contents of nitrogen oxides and other reaction products generated by combustion are different. On the other hand, the temperature of the flue gas discharged by the gas boiler is about 200 ℃, the waste heat utilization effect after recycling is good, and the temperature of the flue gas discharged by the steel rolling heating furnace is 120-150 ℃, and is lower. The boiler utilizes a flue gas recirculation technology to reduce nitrogen oxide emission, and mainly extracts a part of flue gas after combustion to recirculate to the boiler, the oxygen content of the flue gas directly influences the oxygen content in the mixed flue gas, and the temperature of the flue gas can also influence the temperature of the mixed flue gas. In addition, because a part of flue gas is introduced by flue gas recirculation, the temperature in the hearth is reduced, the flow velocity of the flue gas is increased, the heat distribution between the hearth and each heating surface is changed, and certain influence is generated on the boiler efficiency. In the actual operation process, the introduction of the flue gas recirculation can cause phenomena such as unstable combustion and the like. Moreover, the gas-fired boiler and the steel rolling heating furnace have great differences in the aspects of fuel, combustion conditions, internal structures of the boilers and the like.
Therefore, in order to solve the problems, the invention provides a steel rolling heating furnace flue gas recirculation denitration system, which reduces the emission of nitrogen oxides of a heating furnace, reduces the consumption of high-quality coal gas, improves the energy utilization efficiency and effectively reduces the emission of nitrogen oxides and greenhouse gases of iron and steel enterprises through flue gas recirculation.
Disclosure of Invention
The invention aims to provide a flue gas recirculation denitration system of a steel rolling heating furnace.
The flue gas recirculation denitration system of the steel rolling heating furnace comprises an air-smoke side flue gas taking device or a coal-smoke side flue gas taking device, a recirculation fan, a PLC (programmable logic controller) and an air-flue gas mixer, wherein,
the smoke taking device at the air smoke side or the coal smoke side is respectively connected with an air smoke side smoke pipeline or a coal smoke side smoke pipeline of the original heating furnace and the recirculation fan through pipelines;
the other end of the recirculation fan is connected with the air-flue gas mixer through a pipeline;
the other end of the air-flue gas mixer is connected with the original heating furnace;
the air smoke side smoke taking device or the coal smoke side smoke taking device extracts partial smoke from an air smoke side or a coal smoke side flue, then the partial smoke enters the recirculation fan, then the partial smoke is sent into the air smoke mixer, the partial smoke and the air are mixed and then sent into the steel rolling heating furnace, and the PLC controller sets an optimal combustion curve according to the quantity of the recovered smoke and the combustion load, so that automatic control is realized.
According to the steel rolling heating furnace flue gas recirculation denitration system, the PLC simultaneously regulates and controls the safety interlocking protection system, and the PLC control system is used for automatically regulating and controlling the recirculation fan device, the flue gas flow and the safety interlocking protection system.
According to the steel rolling heating furnace flue gas recirculation denitration system, a control valve is arranged on the pipeline.
According to the steel rolling heating furnace flue gas recirculation denitration system, a quick cut-off valve and a pneumatic adjusting valve are installed at the inlet of the recirculation fan.
According to the steel rolling heating furnace flue gas recirculation denitration system, the outlet of the recirculation fan is provided with the quick cut-off valve and the manual cut-off valve.
According to the steel rolling heating furnace flue gas recirculation denitration system, a pneumatic valve is arranged between the air flue gas mixer and the recirculation fan.
According to the steel rolling heating furnace flue gas recirculation denitration system, a laser oxygen meter and a laser CO detector are arranged between the original heating furnace and the air flue gas mixer.
According to the steel rolling heating furnace flue gas recirculation denitration system, the PLC is respectively connected with the recirculation fan and the laser oxygen meter.
According to the flue gas recirculation denitration system for the steel rolling heating furnace, the air blower is connected with the air flue gas mixer.
According to the steel rolling heating furnace flue gas recirculation denitration system, the air blower is provided with the pressure transmitter.
The technical scheme of the application has the advantages that:
at present, a low-nitrogen combustion device of a steel rolling heating furnace is mainly focused on low-nitrogen combustor equipment modification and is not applied to a recirculation system on the steel rolling heating furnace. To the recirculation system on the steel rolling heating furnace, the flue gas temperature and the component content of the generated products all can influence the follow-up flue gas extraction quantity, and in the flue gas extraction process of the recirculation fan, the improper extraction quantity can cause the uneven distribution phenomenon of the oxygen partial pressure of the gas in the hearth, finally can lead to the generation of the local high temperature problem in the hearth, and the blank forming is influenced while the low-nitrogen combustion effect and the quality are reduced. The smoke circulating system is innovatively introduced, air/soot is extracted and mixed with air and then sent to the steel rolling heating furnace, oxygen content and carbon monoxide content in the smoke are controlled, air is reasonably distributed, air-fuel ratio is adjusted, and a local high-temperature area is restrained. The generation amount of nitrogen oxides is greatly reduced. Solves the problem that a large amount of nitrogen oxides are generated by the combustion of blast furnace gas or converter gas in the blank heating process of the current heating furnace.
Drawings
FIG. 1 is a frame diagram of a flue gas recirculation denitration system of a steel rolling heating furnace according to the present invention.
Reference numerals:
1: a steel heating furnace; 2: an air-smoke blower; 3: a recirculation fan; 4: a PLC controller; 5: an air-flue gas mixer; 6: a laser oxygen meter; 7: an air duct; 8: a quick cut-off valve; 9: a pneumatic adjustment gate; 10: a quick shut-off valve 10; 11: manually shutting off the valve; 13: a pneumatic valve; 14: an air blower; 15: a pressure transmitter.
Detailed Description
The technical solution of the present application is described in detail below with reference to specific embodiments.
The flue gas recirculation denitration system of the steel rolling heating furnace comprises an air-smoke side flue gas taking device or a coal-smoke side flue gas taking device, a recirculation fan, a PLC (programmable logic controller) and an air-flue gas mixer, wherein,
the smoke taking device at the air smoke side or the coal smoke side is respectively connected with an air smoke side smoke pipeline or a coal smoke side smoke pipeline of the original heating furnace and the recirculation fan through pipelines;
the other end of the recirculation fan is connected with the air-flue gas mixer through a pipeline;
the other end of the air-flue gas mixer is connected with the original heating furnace;
the air smoke side smoke taking device or the coal smoke side smoke taking device extracts partial smoke from an air smoke side or a coal smoke side flue, then the partial smoke enters the recirculation fan, then the partial smoke is sent into the air smoke mixer, the partial smoke and the air are mixed and then sent into the steel rolling heating furnace, and the PLC controller sets an optimal combustion curve according to the quantity of the recovered smoke and the combustion load, so that automatic control is realized.
According to the steel rolling heating furnace flue gas recirculation denitration system, the PLC simultaneously regulates and controls the safety interlocking protection system, and the PLC control system is used for automatically regulating and controlling the recirculation fan device, the flue gas flow and the safety interlocking protection system.
According to the steel rolling heating furnace flue gas recirculation denitration system, a control valve is arranged on the pipeline.
According to the steel rolling heating furnace flue gas recirculation denitration system, a quick cut-off valve and a pneumatic adjusting valve are installed at the inlet of the recirculation fan.
According to the steel rolling heating furnace flue gas recirculation denitration system, the outlet of the recirculation fan is provided with the quick cut-off valve and the manual cut-off valve.
According to the steel rolling heating furnace flue gas recirculation denitration system, a pneumatic valve is arranged between the air flue gas mixer and the recirculation fan.
According to the steel rolling heating furnace flue gas recirculation denitration system, a laser oxygen meter and a laser CO detector are arranged between the original heating furnace and the air flue gas mixer.
According to the steel rolling heating furnace flue gas recirculation denitration system, the PLC is respectively connected with the recirculation fan and the laser oxygen meter.
According to the flue gas recirculation denitration system for the steel rolling heating furnace, the air blower is connected with the air flue gas mixer.
According to the steel rolling heating furnace flue gas recirculation denitration system, the air blower is provided with the pressure transmitter.
According to the steel rolling heating furnace flue gas recirculation denitration system, the control valve is arranged on the pipeline. When the diameter of the newly-added pipeline is more than or equal to DN500, the actual wall thickness is more than or equal to 8mm, and when the diameter of the pipeline is less than DN500, the actual wall thickness is more than or equal to 6 mm. The newly-added valve maintenance platform can reach each instrument, valve department, and platform decorative pattern thickness is not less than 5 mm.
The flue gas of the steel rolling heating furnace according to the invention is recycledAnd the saltpeter system, the recirculation fan control system, the flue gas flow control and safety interlocking protection system are regulated and controlled by the PLC control system. The PLC controller sets an optimal combustion curve according to the quantity of the recovered flue gas and the combustion load, and automatic control is achieved. According to different working conditions of the heating furnace, the recovery amount of flue gas is automatically adjusted to reduce the oxygen content of air, the air distribution is reasonable, the air-fuel ratio is adjusted, a local high-temperature area is inhibited, and NO is reducedxIs generated in large quantities. Meets the limit requirement of the ultra-low emission standard of the atmospheric pollutants in the steel industry (DB 13/2169-2018). The flow of the recirculated flue gas is automatically adjusted by a PLC automatic system through a pipeline oxygen meter, the oxygen content of the original air side is reduced from 21% to about 16%, and the oxygen content of the mixed flue gas is stable about 16%.
According to the steel rolling heating furnace flue gas recirculation denitration system, the PLC control system adopts an advanced proportional control type automatic control system, the flow of the recirculated flue gas can be effectively controlled, perfect safety interlocking protection is set, forced shutdown is carried out when an alarm signal is sent out, and the safety and reliability in operation of the system are ensured. In the operation process of the flue gas recirculation denitration system of the steel rolling heating furnace, the process of fusing combustion-supporting air and extracting the circulating flue gas is very critical, and if the combustion-supporting air and the circulating flue gas cannot be uniformly and effectively mixed together, the phenomenon of unbalanced oxygen partial pressure in a hearth can be caused, so that the local high-temperature problem is caused, and the efficiency and the quality of nitrogen combustion are reduced. The flue gas recirculation denitration system of the steel rolling heating furnace effectively avoids the problems and reduces NO by reducing the oxygen content of air, reasonably distributing air, adjusting the air-fuel ratio and inhibiting a local high-temperature areaxThe amount of production. And the method has the advantages of small modification range of the existing equipment, low operation cost, simple operation and high safety.
The technical scheme of the application is described in detail in the following with the accompanying drawings.
As shown in FIG. 1, the flue gas recirculation denitration system of the steel rolling heating furnace comprises a steel rolling heating furnace 1, an air-smoke blower 2, a recirculation blower 3, a PLC 4, an air-smoke mixer 5 and a laser oxygen meter 6, wherein the steel rolling heating furnace 1 is connected with the air-smoke blower 2, the recirculation blower 3 is connected with the air-smoke blower 2 through an air pipe 7, a quick cut-off valve 8 and a pneumatic regulating valve 9 are installed at the inlet of the recirculation blower 3, a quick cut-off valve 10 and a manual cut-off valve 11 are installed at the outlet of the recirculation blower 3, the air-smoke mixer 5 is connected with the recirculation blower 3 through the air pipe 7, a pneumatic valve 13 is arranged between the air-smoke mixer 5 and the recirculation blower 3 and is connected through the air pipe 7, the steel rolling heating furnace 1 is connected with the air-smoke mixer 5, the laser oxygen meter 6 and the laser CO detector 17 are arranged between the steel rolling heating furnace 1 and the air-smoke mixer 5, through the connection of tuber pipe 7, recirculation fan 3 and laser oxygen meter 6 are connected to PLC controller 4, and air blower 14 is connected with air gas blender 5, and air blower 14 installs pressure transmitter 15.
Wherein, the steel rolling heating furnace 1 is connected with a soot blower 2.
Wherein the recirculation fan 3 is connected with the soot fan through an air pipe 7.
The steel rolling heating furnace flue gas recirculation denitration system has the following operation mode:
s1, extracting a part of smoke from the smoke side flue through the smoke air blower 2;
s2, the extracted flue gas is sent to an air flue gas mixer 5 through a recirculation fan 3, and is sent to a steel rolling heating furnace together with air after being mixed, the flue gas amount extracted by an air flue gas fan 2 is automatically controlled by setting an optimal combustion curve through the flue gas amount recovered by a PLC controller and the combustion load, and the flue gas flow rate of a flue gas recirculation system is adjusted through a pipeline oxygen amount meter so as to control the flow rate of the recirculated flue gas;
s3 mixed flue gas is sent into a steel rolling heating furnace 1 for backflash, the oxygen content of the original air side is reduced from 21% to 16%, the oxygen content of the mixed flue gas is stabilized at about 16%, the oxygen content in the air is reduced, an oxygen-poor atmosphere is formed before the mixed flue gas enters the steel rolling heating furnace, the formation of a local high-temperature area in the heating furnace is inhibited by adjusting the air-fuel ratio and reasonably distributing air, and therefore NO is reducedxAnd (4) generating.
The flue gas recirculation denitration system of the steel rolling heating furnace has good environmental protection effect, and reduces NO of the steel rolling heating furnacexThe discharge amount of (2) reaches the pre-discharge amountStage of NOxThe removal effect, namely: the heat value of the existing fuel (mixed fuel) is less than 1000kcal/Nm3In the case of modified NOxConcentration < 100mg/Nm3(converted to 8% oxygen); the heat value of the existing fuel (mixed fuel) is more than 1000kcal/Nm3In the case of modified NOxConcentration < 120mg/Nm3(converted to 8% oxygen). Meets the limit requirement of the ultra-low emission standard of the atmospheric pollutants in the steel industry (DB 13/2169-2018).
In another embodiment, the extracted flue gas is obtained by extracting the flue gas at the soot side by a soot fan, mixing the flue gas with the air delivered by an air blower, and delivering the mixture into a steel rolling heating furnace, wherein the oxygen content of the mixed flue gas is stabilized at about 16% by automatic regulation and control of a PLC (programmable logic controller), so that the NO (nitric oxide) is greatly reducedxThe emission concentration of (c).
The invention applies the flue gas recirculation denitration technology to the flue gas treatment of the steel rolling heating furnace, provides the flue gas recirculation denitration system of the steel rolling heating furnace, and effectively reduces NO in the flue gas discharged by the steel rolling heating furnacexAvoids the disadvantages and shortcomings of the prior art. The flue gas discharged by the heating furnace is recycled, and NO is removedxHigh efficiency and flexible application (can be used for independently denitrating the flue gas of the heating furnace and can also be used together with other denitration processes). The flue gas at the outlet of the heating furnace and the preheated air are mixed and fed into the heating furnace, so that the effects of temperature reduction of a combustion part and oxygen concentration control can be realized, and NO is reducedxIs performed.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, and any modifications made on the basis of the present invention are within the scope of the present invention.
Claims (10)
1. A steel rolling heating furnace flue gas recirculation denitration system is characterized by comprising an air smoke side flue gas taking device or a coal smoke side flue gas taking device, a recirculation fan, a PLC (programmable logic controller) and an air flue gas mixer, wherein,
the smoke taking device at the air smoke side or the coal smoke side is respectively connected with an air smoke side smoke pipeline or a coal smoke side smoke pipeline of the original heating furnace and the recirculation fan through pipelines;
the other end of the recirculation fan is connected with the air-flue gas mixer through a pipeline;
the other end of the air-flue gas mixer is connected with the original heating furnace;
the air smoke side smoke taking device or the coal smoke side smoke taking device extracts partial smoke from an air smoke side or a coal smoke side flue, then the partial smoke enters the recirculation fan, then the partial smoke is sent into the air smoke mixer, the partial smoke and the air are mixed and then sent into the steel rolling heating furnace, and the PLC controller sets an optimal combustion curve according to the quantity of the recovered smoke and the combustion load, so that automatic control is realized.
2. The steel rolling heating furnace flue gas recirculation denitration system of claim 1, wherein the PLC controls the safety interlock protection system at the same time.
3. The steel rolling heating furnace flue gas recirculation denitration system of claim 1, wherein a control valve is provided on the pipeline.
4. The steel rolling heating furnace flue gas recirculation denitration system of claim 1, wherein an inlet of the recirculation fan is provided with a quick cut-off valve and a pneumatic adjusting valve.
5. The steel rolling heating furnace flue gas recirculation denitration system of claim 1, wherein the outlet of the recirculation fan is provided with a quick cut-off valve and a manual cut-off valve.
6. The steel rolling heating furnace flue gas recirculation denitration system of claim 1, wherein a pneumatic valve is arranged between the air flue gas mixer and the recirculation fan.
7. The steel rolling heating furnace flue gas recirculation denitration system of claim 1, wherein a laser oxygen meter and a laser CO detector are arranged between the original heating furnace and the air flue gas mixer.
8. The steel rolling heating furnace flue gas recirculation denitration system of claim 7, wherein the PLC controller is respectively connected with a recirculation fan and a laser oxygen meter.
9. The steel rolling heating furnace flue gas recirculation denitration system of claim 1, wherein an air blower is connected to the air flue gas mixer.
10. The steel rolling heating furnace flue gas recirculation denitration system of claim 9, wherein the air blower is equipped with a pressure transmitter.
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| CN202111186339.1A CN113916014A (en) | 2021-10-12 | 2021-10-12 | Steel rolling heating furnace flue gas recirculation deNOx systems |
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| CN202111186339.1A CN113916014A (en) | 2021-10-12 | 2021-10-12 | Steel rolling heating furnace flue gas recirculation deNOx systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526612A (en) * | 2022-03-21 | 2022-05-24 | 江苏道和环保科技有限公司 | CSP heating furnace flue gas recirculation waste heat recovery system |
| CN114777509A (en) * | 2022-05-07 | 2022-07-22 | 山东京博石油化工有限公司 | Heating furnace flue gas circulating combustion system and method |
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2021
- 2021-10-12 CN CN202111186339.1A patent/CN113916014A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114526612A (en) * | 2022-03-21 | 2022-05-24 | 江苏道和环保科技有限公司 | CSP heating furnace flue gas recirculation waste heat recovery system |
| CN114777509A (en) * | 2022-05-07 | 2022-07-22 | 山东京博石油化工有限公司 | Heating furnace flue gas circulating combustion system and method |
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