CN215983939U - Sectional type low-emission steel rolling heating furnace system - Google Patents
Sectional type low-emission steel rolling heating furnace system Download PDFInfo
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- CN215983939U CN215983939U CN202122498976.4U CN202122498976U CN215983939U CN 215983939 U CN215983939 U CN 215983939U CN 202122498976 U CN202122498976 U CN 202122498976U CN 215983939 U CN215983939 U CN 215983939U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 79
- 239000010959 steel Substances 0.000 title claims abstract description 79
- 238000010438 heat treatment Methods 0.000 title claims abstract description 73
- 238000005096 rolling process Methods 0.000 title claims abstract description 68
- 239000000779 smoke Substances 0.000 claims abstract description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000001301 oxygen Substances 0.000 claims abstract description 16
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 16
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000003517 fume Substances 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 29
- 239000003546 flue gas Substances 0.000 abstract description 29
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 21
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Abstract
The utility model relates to the technical field of emission reduction of nitrogen oxides in industrial flue gas, in particular to a segmented low-emission steel rolling heating furnace system. The system comprises a steel rolling heating furnace, an air-smoke induced draft fan, a recirculation fan and a blower, wherein the steel rolling heating furnace, the air-smoke induced draft fan and the recirculation fan are sequentially communicated, the blower is also respectively communicated with inlets of all sections of the steel rolling heating furnace, and air smoke introduced by the air-smoke induced draft fan is mixed with air introduced by the blower through the recirculation fan and then is input into all sections of the steel rolling heating furnace through a sectional air inlet pipe for backflash. This application is through setting up recirculation fan with empty smoke side flue gas circulation to steel rolling heating furnace and carry out the backflash, and the oxygen concentration in the mixed flue gas of each burning section of accurate control steel rolling heating furnace has greatly reduced steel rolling heating furnace's nitrogen oxide emission.
Description
Technical Field
The utility model relates to the technical field of emission reduction of nitrogen oxides in industrial flue gas, in particular to a segmented low-emission steel rolling heating furnace system.
Background
In recent years, fossil fuels have been widely used in industrial fields such as coal-fired power generation, steel making and iron making, and the like, resulting in a large amount of NOx emission. This causes a series of environmental problems such as acid rain, photochemical pollution, greenhouse effect, and ozone depletion. The control and abatement of environmental pollution caused by NOx is imminent. In the steel industry, in order to meet the limit requirements of the ultralow emission standard of atmospheric pollutants in the steel industry (DB13/2169-2018) and the market standard of Tianjin, the flue gas of a steel rolling heating furnace needs to be subjected to low-nitrogen transformation.
In the prior denitration technology, the denitration efficiency of the SCR method is high, the emission standard can reach 90%, but the process is complex, and the later investment cost and the subsequent operation and treatment cost are high. The SNCR method has the advantages of low investment and low subsequent operation treatment cost, but the denitration efficiency can only reach 60 percent, and the low-nitrogen emission requirement of a steel rolling heating furnace can not be met.
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, the amount of flue gas introduced becomes a key to limit the development of the technology.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of the existing flue gas recirculation combustion technology, the utility model provides a sectional type low-emission steel rolling heating furnace system which can obviously reduce the emission of NOx.
The sectional type low-emission steel rolling heating furnace system comprises a steel rolling heating furnace, an air-smoke induced draft fan, a recirculation fan and a blower, wherein,
the hearth of the steel rolling heating furnace is divided into a preheating section, a heating section and a soaking section along the length direction, the mixed flue gas of air and air smoke is respectively introduced into the preheating section, the heating section and the soaking section of the steel rolling heating furnace by a recirculation fan for back combustion (checking is carried out by combining with the attached drawing, the air sent by a blower controlled by the recirculation fan is not shown in figure 1, please check),
the outlet of the steel rolling heating furnace is connected with the inlet of the air-smoke induced draft fan, the outlet of the air-smoke induced draft fan is connected with the inlet of the recirculation fan, the outlet of the recirculation fan is respectively communicated with the inlets of all the sections of the steel rolling heating furnace, the air feeder is also respectively communicated with the inlets of all the sections of the steel rolling heating furnace, and the air smoke of the air-smoke induced draft fan is mixed with the air introduced by the air feeder through the recirculation fan and then is input into all the sections of the steel rolling heating furnace through the sectional air inlet pipe for backflash.
The segmented low-emission steel rolling furnace system according to the application, wherein the steel rolling furnace comprises two heating segments.
The sectional type low-emission steel rolling heating furnace system is characterized in that a pneumatic adjusting door is arranged at the inlet of the recirculation fan.
The sectional type low-emission steel rolling heating furnace system is characterized in that a quick shut-off valve and a manual shut-off valve are arranged at the outlet of the recirculation fan.
The sectional type low-emission steel rolling heating furnace system is characterized in that a pressure gauge is arranged at the outlet of the recirculation fan.
The segmented low-emission rolled steel heating furnace system according to the application is characterized in that a flow meter is arranged at the outlet of the recirculation fan.
According to the sectional type low-emission steel rolling heating furnace system, a CO detector is arranged at the downstream of the recirculation fan and used for detecting the content of CO in flue gas.
The sectional type low-emission steel rolling heating furnace system is characterized in that a manual shut-off valve and a quick shut-off valve are arranged at an outlet of the air-smoke induced draft fan.
The sectional type low-emission steel rolling heating furnace system according to the application, wherein an electric regulating valve is arranged at the inlet of the steel rolling heating furnace corresponding to each section of the steel rolling heating furnace.
The sectional type low-emission steel rolling heating furnace system is characterized in that a laser oxygen meter is arranged at the inlet of the steel rolling heating furnace corresponding to each section of the steel rolling heating furnace.
Compared with the prior art, the sectional type low-emission steel rolling heating furnace system has the following beneficial effects:
the recycling combustion technology is little in modification of the existing equipment, the cost of one-time investment for subsequent operation and maintenance is low, the smoke on the air smoke side of the steel rolling heating furnace can be recycled, the smoke on the air smoke side is recycled to the steel rolling heating furnace for back combustion by arranging the recycling fan, the oxygen concentration in the mixed smoke of each combustion section of the steel rolling heating furnace is accurately controlled, and the emission of nitrogen oxides of the steel rolling heating furnace is greatly reduced. Through setting up the segmentation intake pipe, set up the oxygen content value of each section mixed flue gas intake pipe respectively to realize automatic control through the laser oxygen gauge and adjust, every section oxygen concentration in the accurate control steel rolling heating furnace, guaranteeing the operating temperature's of steel rolling heating furnace condition, make the oxygen concentration of every furnace reduce as far as possible, avoid local high temperature district to produce, further reduced steel rolling heating furnace nitrogen oxide's emission.
Drawings
FIG. 1 is a schematic view of a sectional type low-discharge rolled steel heating furnace system in an embodiment of the present invention.
Description of reference numerals:
1-steel rolling heating furnace; 2-air smoke induced draft fan; 3-manually closing the valve; 4-quickly closing the valve; 5-a pneumatic regulating gate; 6-recirculation fan; 7-laser CO detector; 8-a pressure gauge; 9-a flow meter; 10-quick shut-off valve; 12-an electric regulating valve; 13-laser oxygen gauge; 14-blower.
Detailed Description
The technical scheme of the application is described in detail in the following with the accompanying drawings.
As shown in figure 1, the sectional type low-emission steel rolling heating furnace system comprises a steel rolling heating furnace 1 and an air-smoke induced draft fan 2, wherein the air-smoke induced draft fan 2 is connected with the steel rolling heating furnace 1 through an air-smoke discharge pipe and used for conveying air smoke to an air-smoke chimney, and preferably, a manual shut-off valve 3 is arranged at an outlet of the air-smoke induced draft fan 2. Preferably, the air inlet of the steel rolling heating furnace 1 is provided with 4 electric regulating valves 12 for controlling the air inlet flow of the circulating flue gas; the air inlet of the steel rolling heating furnace is provided with 4 laser oxygen meters 13, the regulating valve is controlled according to the oxygen content measured by the oxygen analyzer, and the oxygen content of the mixed flue gas entering the steel rolling heating furnace is accurately controlled by combining with the actual working condition so as to ensure the oxygen content required by the system and achieve the purpose of reducing the NOx emission.
And the outlet of the air smoke induced draft fan 2 is connected with the air inlet of the recirculation fan 6 through an air supply pipe, and the air smoke induced draft fan is used for mixing air smoke with air introduced by the air feeder 14 and then is recycled to the steel rolling heating furnace 1 in a segmented mode for back combustion. The inlet of the recirculation fan 6 is provided with a quick shut-off valve 4 and a pneumatic regulating valve 5. Preferably, the outlet of the recirculation fan 6 is provided with a quick shut-off valve 10 and a manual shut-off valve 3, which are used for quick shut-off when maintenance or operation problems occur, so as to ensure the operation safety. Preferably, the outlet of the recirculation fan 6 is provided with a laser CO detector 7 and is interlocked with a fan inlet and outlet shutoff valve, so that CO is more than 20000ppm, the system is automatically closed, and the safe operation of the process is ensured. The gas outlet of the recirculation fan 6 can be also provided with a flowmeter 8 for monitoring the flow of the flue gas, and a pressure gauge 9 for monitoring the pressure of the flue gas.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sectional type low-emission steel rolling heating furnace system is characterized by comprising a steel rolling heating furnace, an air-smoke induced draft fan, a recirculation fan and a blower, wherein,
the outlet of the steel rolling heating furnace is connected with the inlet of the air-smoke induced draft fan, the outlet of the air-smoke induced draft fan is connected with the inlet of the recirculation fan, the outlet of the recirculation fan is respectively communicated with the inlets of all the sections of the steel rolling heating furnace, the air feeder is also respectively communicated with the inlets of all the sections of the steel rolling heating furnace, and air smoke introduced by the air-smoke induced draft fan is mixed with air introduced by the air feeder and then is input into all the sections of the steel rolling heating furnace through the sectional air inlet pipe for back combustion.
2. The segmented low emission steel rolling furnace system according to claim 1, wherein said steel rolling furnace comprises two heating segments.
3. The segmented low-emission rolled steel heating furnace system according to claim 1 or 2, wherein a pneumatic adjustment gate is provided at an inlet of the recirculation fan.
4. The segmented low-emission rolled steel heating furnace system according to claim 1 or 2, wherein a quick shut-off valve and a manual shut-off valve are provided at an outlet of the recirculation fan.
5. The segmented low emission rolled steel furnace system according to claim 1 or 2 wherein a pressure gauge is provided at the outlet of the recirculation fan.
6. The segmented low-emission rolled steel heating furnace system according to claim 1 or 2, wherein a flow meter is provided at an outlet of the recirculation fan.
7. The segmented low emission rolled steel furnace system according to claim 1 or 2 wherein a CO detector is provided downstream of the recirculation fan.
8. The segmented low-emission rolled steel heating furnace system according to claim 1 or 2, wherein a manual shut-off valve and a quick shut-off valve are provided at an outlet of the air-fume induced draft fan.
9. The segmented low-emission steel rolling furnace system according to claim 1 or 2, wherein an electric control valve is provided at an inlet of the steel rolling furnace corresponding to each segment of the steel rolling furnace.
10. The segmented low-emission steel rolling heating furnace system according to claim 1 or 2, wherein a laser oxygen meter is provided at an inlet of the steel rolling heating furnace corresponding to each segment of the steel rolling heating furnace.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122498976.4U CN215983939U (en) | 2021-10-18 | 2021-10-18 | Sectional type low-emission steel rolling heating furnace system |
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| CN202122498976.4U CN215983939U (en) | 2021-10-18 | 2021-10-18 | Sectional type low-emission steel rolling heating furnace system |
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| CN215983939U true CN215983939U (en) | 2022-03-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114838595A (en) * | 2022-04-14 | 2022-08-02 | 东北大学 | Waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion and its heating method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114838595A (en) * | 2022-04-14 | 2022-08-02 | 东北大学 | Waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion and its heating method |
| CN114838595B (en) * | 2022-04-14 | 2023-08-04 | 东北大学 | Waste heat recovery steel rolling heating furnace based on MILD oxygen-enriched combustion and its heating method |
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