CN217110517U - Energy-saving electric furnace flue gas treatment system - Google Patents
Energy-saving electric furnace flue gas treatment system Download PDFInfo
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- CN217110517U CN217110517U CN202220362598.9U CN202220362598U CN217110517U CN 217110517 U CN217110517 U CN 217110517U CN 202220362598 U CN202220362598 U CN 202220362598U CN 217110517 U CN217110517 U CN 217110517U
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Abstract
The utility model relates to an energy-conserving electric stove flue gas processing system, including the steel scrap preheating well, the flue gas burner, spray cooling device, dust removal unit and emission unit, the first flue gas outlet pipe of steel scrap preheating well configuration is connected with the flue gas burner, other the having connected the bypass pipe on first flue gas outlet pipe, the bypass pipe is connected to flue gas burner and sprays the flue gas pipeline between the cooling device on, all be equipped with flow control valve and trip valve on bypass pipe and the first flue gas outlet pipe, the valve accuse unit on the first flue gas outlet pipe is located the low reaches of the other contact of bypass pipe. The bypass pipe is arranged on the outlet flue gas pipe of the waste steel preheating well, the amount of flue gas entering the flue gas combustion device can be adjusted, outlet high-temperature flue gas of the flue gas combustion device is mixed with bypass flue gas in the bypass pipe, dioxin in the bypass flue gas can be fully decomposed, the flue gas treatment amount of the flue gas combustion device is reduced, consumption of fuels such as natural gas is correspondingly saved, and better environmental protection and economical efficiency are obtained.
Description
Technical Field
The utility model belongs to the technical field of electric stove production, concretely relates to energy-conserving electric stove flue gas processing system.
Background
In the steel-making process of the modern ultrahigh power electric arc furnace, the heat taken away by the discharged flue gas accounts for about half of the input electric energy, so that more heat is dissipated in a smoke exhaust pipeline and the surrounding environment, and the waste of resources and energy is great. Therefore, a scrap preheating technology for heating scrap steel before entering a furnace to a certain level by using heat contained in the discharged flue gas is developed; the technology can recover the heat in the flue gas to the preheated scrap steel, on one hand, the waste of the heat discharged by the flue gas can be reduced, on the other hand, the energy and time required by melting the preheated scrap steel are reduced, and the double effects of reducing the smelting energy consumption and improving the productivity can be realized.
If the scrap used in electric arc furnace steelmaking is clean, such techniques can ideally achieve partial recovery of the heat in the flue gas without adversely affecting the surrounding environment. The term "clean" means that the scrap does not contain organic compounds such as fats and oils, paints, and plastics, particularly chlorine-containing organic compounds. However, clean scrap generally means a low source and high price. This is disadvantageous for steelmaking productivity and cost control. The scrap steel with wide source and low price is generally social scrap steel. Such scrap comes from waste products of all social industries and is mixed together in the recycling process and is not substantially clean. In the process of preheating the waste steel by using the heat of the flue gas, the temperature of the flue gas is higher in the upstream stage of flowing of the flue gas, and organic compounds mixed in the waste steel can be decomposed into a mixture of organic micromolecules, carbon monoxide, carbon dioxide and the like. In the flowing process, the temperature of the flue gas is continuously reduced along with the continuous heat transfer of the flue gas to the waste steel with lower temperature. Generally, when the temperature is reduced to a range of about 850 to 250 ℃, the mixture contained in the flue gas starts to react and rapidly generates highly carcinogenic dioxin. If treatment measures aiming at dioxin are not taken subsequently, the dioxin is introduced into production and living environments along with dust removal ash and tail gas after dust removal, and permanent damage is caused to the health of human beings and other organisms.
At present, an effective treatment measure is to heat the flue gas rich in dioxin and low in temperature to over 900 ℃ by a burner and keep the temperature for a certain time, so that the dioxin is fully decomposed at the high temperature. Then, the material is rapidly cooled to below about 250 ℃ in a spraying water mist cooling mode. Otherwise, the decomposition product of dioxin will react again and generate dioxin rapidly when the subsequent slow cooling is performed in the range of about 850-250 ℃. However, the combustion of the burner needs to consume a large amount of natural gas, and the economical efficiency and environmental friendliness are to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model relates to an energy-saving electric stove flue gas treatment system, which can at least solve part of the defects of the prior art.
The utility model relates to an energy-conserving electric stove flue gas processing system, include the waste steel preheating well with electric stove waste steel entry linkage and along flue gas burner, spray cooling device, dust removal unit and the emission unit that flue gas circulation direction connected gradually, waste steel preheating well disposes first flue gas outlet pipe, first flue gas outlet pipe with flue gas burner connects, in other the connecing has the bypass pipe on the first flue gas outlet pipe, the other end of bypass pipe is connected to flue gas burner with spray on the flue gas pipeline between the cooling device, the bypass pipe reaches all be equipped with the valve accuse unit on the first flue gas outlet pipe, the valve accuse unit includes flow control valve and trip valve, the valve accuse unit on the first flue gas outlet pipe is located the low reaches of the other contact point of bypass pipe.
As one embodiment, a flue gas mixing chamber is arranged on a flue gas pipeline between the flue gas combustion device and the spray cooling device, and the bypass pipe is connected to the flue gas mixing chamber.
As one embodiment, a smoke detection unit is arranged on the smoke inlet side of the spray cooling device, the smoke detection unit comprises a smoke temperature sensor and/or a smoke component analyzer, and the smoke detection unit is in interlocking control with the two sets of valve control units.
In one embodiment, a flue gas pipeline between the spray cooling device and the dust removal unit is provided with a spraying unit for spraying a dioxin adsorbent into the pipeline.
In one embodiment, a low-temperature flue gas mixing pipe is connected to a flue gas pipeline between the spray cooling device and the dust removal unit.
As an embodiment, the energy-saving electric furnace flue gas treatment system further comprises a second flue gas outlet pipe connected with the electric furnace flue, the second flue gas outlet pipe is bypassed to the first flue gas outlet pipe, and a second flue gas outlet pipe bypass point is located upstream of the bypass pipe bypass point.
As one embodiment, a two-inlet one-outlet three-way regulating valve is arranged at a bypass point of the second flue gas outlet pipe.
As an embodiment, the dust removing unit includes a bag-type dust remover.
The utility model discloses following beneficial effect has at least:
the utility model provides an electric stove flue gas processing system sets up the bypass pipe on the export flue gas pipe of steel scrap preheating well, and the flue gas volume in the adjustable flue gas burner that gets into utilizes the export high temperature flue gas of flue gas burner to mix with the bypass flue gas in the bypass pipe, can make the dioxin that probably contains in the bypass flue gas fully decompose to reduce flue gas burner's flue gas handling capacity, correspondingly practice thrift the consumption of fuels such as natural gas, obtain better feature of environmental protection and economic nature.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electric furnace flue gas treatment system provided by an embodiment of the present invention;
fig. 2 is a sectional view taken along line a-a of fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention are described below clearly and completely, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, the embodiment of the utility model provides an energy-saving electric furnace flue gas treatment system, which comprises a scrap preheating well 2 connected with an electric furnace scrap inlet, a flue gas combustion device 3, a spray cooling device 4, a dust removal unit 7 and a discharge unit 8 which are connected in sequence along the flue gas circulation direction, the scrap preheating well 2 is provided with a first flue gas outlet pipe 21, the first flue gas outlet pipe 21 is connected with the flue gas combustion device 3, a bypass pipe 22 is connected to the first flue gas outlet pipe 21, the other end of the by-pass pipe 22 is connected to the flue gas pipeline between the flue gas combustion device 3 and the spray cooling device 4, and the bypass pipe 22 and the first flue gas outlet pipe 21 are both provided with a valve control unit, the valve control unit comprises a flow control valve and a stop valve, and the valve control unit on the first flue gas outlet pipe 21 is positioned at the downstream of the bypass pipe bypass point.
The above-mentioned flue gas combustion device 3 is a conventional device in the art, and the detailed structure thereof is not described herein. The flue gas temperature can be improved through the flue gas combustion device 3, and dioxin in the flue gas can be promoted to be decomposed at high temperature; a certain amount of combustible components such as CO and the like may be left in the electric furnace flue gas, and if the combustible components in the electric furnace flue gas are difficult to be fully combusted, fuels such as natural gas and the like can be additionally introduced. Preferably, the flue gas combustion device 3 can heat the temperature of the flue gas to above 1000 ℃.
The spray cooling device 4 can rapidly cool the flue gas to prevent the flue gas from generating dioxin again in the subsequent treatment process. The spray cooling device 4 can adopt a spray tower, a plurality of cooling nozzles are arranged at the flue gas inlet section of the spray tower, and the mixed flue gas can be rapidly cooled under the uniform spray cooling effect of each cooling nozzle, preferably, the temperature of the flue gas is reduced to below 250 ℃. In one embodiment, the cooling nozzle adopts an atomizing nozzle, the sprayed cooling water mist is controlled to be completely evaporated into water vapor while the temperature of the high-temperature flue gas is reduced to be within a set temperature range, and the water vapor cannot be in a liquid state in a spray tower and a subsequent pipeline, so that the corrosion of the flue gas pipeline and the bag pasting phenomenon of a dust filtering cloth bag are avoided.
In one embodiment, the dust removing unit 7 comprises a bag-type dust remover. The above-mentioned discharge unit 8 is a conventional device in the art, and the specific structure thereof is omitted here.
Further preferably, as shown in fig. 1, a low-temperature flue gas mixing pipe 5 is connected to a flue gas pipeline between the spray cooling device 4 and the dust removal unit 7. Through mixing into low temperature flue gas to further reduce the flue gas temperature, prevent the regeneration of dioxin in the flue gas, and avoid dust removal unit 7 to appear sticking with paste the bag phenomenon. In one embodiment, the temperature of the flue gas at the inlet of the dust removal unit 7 is in the range of 120-135 ℃ by mixing low-temperature flue gas. The low-temperature flue gas mixing pipe 5 is preferably introduced into the secondary flue gas of a factory building, namely the low-temperature flue gas mixing pipe 5 is connected with a secondary flue gas pipeline of the factory building; in other embodiments, cold air may be mixed in, for example, a fan is connected to the low-temperature flue gas mixing pipe 5.
Further preferably, as shown in fig. 1, a flue gas pipeline between the spray cooling device 4 and the dust removal unit 7 is provided with a spraying unit 6 for spraying a dioxin adsorbent into the flue gas pipeline. The dioxin adsorbents include, but are not limited to, activated carbon. The dioxin adsorbent sprayed into the tube can firmly adsorb and hold the escaped dioxin, thereby further improving the environmental protection of the flue gas treatment system of the electric furnace.
The electric furnace flue gas treatment system that this embodiment provided sets up bypass pipe 22 on the export flue gas pipe of steel scrap preheating well 2, the adjustable flue gas volume that gets into in flue gas burner 3, the export high temperature flue gas that utilizes flue gas burner 3 mixes with the bypass flue gas in the bypass pipe 22, can impel the dioxin that probably contains in the bypass flue gas to fully decompose, thereby reduce flue gas handling capacity of flue gas burner 3, correspondingly practice thrift the consumption of fuel such as natural gas, obtain better feature of environmental protection and economic nature.
Further preferably, as shown in fig. 1, a flue gas mixing chamber 9 is arranged on a flue gas pipeline between the flue gas combustion device 3 and the spray cooling device 4, and the bypass pipe 22 is connected to the flue gas mixing chamber 9. The high-temperature flue gas at the outlet of the flue gas combustion device 3 and the bypass flue gas in the bypass pipe 22 can be fully mixed in the flue gas mixing chamber 9 and can stay for a certain time, so that the effect of fully decomposing dioxin carried in the bypass flue gas is achieved.
In one embodiment, a smoke detection unit is arranged on the smoke inlet side of the spray cooling device 4, the smoke detection unit comprises a smoke temperature sensor and/or a smoke component analyzer, and the smoke detection unit is controlled by the two sets of valve control units in an interlocking manner. By analyzing the properties of the inlet flue gas of the spray cooling device 4, for example, whether the temperature of the flue gas reaches the standard or not is judged, or whether the flue gas contains dioxin is detected by a flue gas component analyzer, so that the actions of the two groups of valve control units are reliably and accurately guided, the flue gas treatment effect is ensured, and the energy saving performance of system operation is improved. Specifically, when the temperature of the flue gas is insufficient/when dioxin is detected in the flue gas, the amount of the flue gas entering the flue gas combustion device 3 can be increased accordingly.
In the above scheme with the blowing unit 6, the flue gas detection unit may also be interlocked with the blowing unit 6, so that when the inlet flue gas temperature of the spray cooling device 4 is insufficient/dioxin is detected in the flue gas, the blowing unit 6 is guided to operate, and the consumption of the dioxin adsorbent can be saved.
For the interlock control described above, it is obviously a conventional automatic control mode, requiring no additional programming.
The above electric furnace flue gas treatment system is further optimized, and as shown in fig. 1, the electric furnace flue gas treatment system further comprises a second flue gas outlet pipe 11 connected to the electric furnace flue, the second flue gas outlet pipe 11 is bypassed to the first flue gas outlet pipe 21, and the second flue gas outlet pipe bypass point is located upstream of the bypass pipe bypass point. The electric furnace flue can be a fourth hole flue on the cover of the electric furnace and can provide a discharge channel for high-temperature flue gas generated in the steelmaking reaction process of an electric furnace molten pool, one part of the electric furnace flue gas can be discharged through an electric furnace scrap inlet and enters the scrap preheating well 2 for scrap preheating operation, one part of the electric furnace flue gas can be discharged through the electric furnace flue, and the electric furnace flue gas is divided into the two parts of flue gas flows under the condition that other flue gas discharge channels are not provided. In the embodiment, one part of the electric furnace flue gas is led out for preheating the waste steel so as to realize the primary utilization of the flue gas waste heat, the other part of the electric furnace flue gas is directly led out and mixed with the flue gas after the waste steel is preheated, and dioxin possibly contained in the flue gas discharged by the waste steel preheating device can be fully decomposed by the high-temperature electric furnace flue gas, so that the waste steel preheating and the treatment of the dioxin generated in the waste steel preheating process can be simultaneously realized by utilizing the self heat of the electric furnace flue gas, and the consumption of natural gas in the flue gas combustion device 3 can be further saved; even if the flue gas passes through the flue gas combustion device 3, the flue gas can be selected to pass through or not pass through the flue gas combustion device 3 according to specific working conditions, the energy saving performance is better, and the bypass flue gas in the bypass pipe 22 has higher temperature due to the flue gas mixing, so that even if a part of the flue gas enters the flue gas combustion device 3, the amount of the part of the flue gas is also smaller.
Furthermore, a two-in one-out three-way regulating valve is arranged at a side joint point of the second flue gas outlet pipe, obviously, the second flue gas outlet pipe 11 is connected with one inlet of the three-way regulating valve, the front section of the first flue gas outlet pipe 21 is connected with the other inlet of the three-way regulating valve, and the rear section of the first flue gas outlet pipe 21 is connected with the outlet of the three-way regulating valve. The flue gas flow of distributing the first flue gas outlet pipe 21 and the second flue gas outlet pipe 11 is adjusted by the three-way adjusting valve, the waste steel preheating effect is guaranteed, meanwhile, the purpose of adjusting the temperature of the two parts of flue gas after mixing can be achieved, and the dioxin generation condition in the flue gas flow is better controlled.
In a further embodiment, the second flue gas outlet pipe 11 may also be connected to the flue gas mixing chamber 9.
In an alternative embodiment, as shown in fig. 2, a filling cavity is arranged in a part of the well wall of the scrap preheating well 2, and a phase change material 201 is contained in the filling cavity. Through set up phase change material 201 in the wall of a well of steel scrap preheating well 2, when electric stove 1 smelts and produces high temperature flue gas, when high temperature flue gas preheats the steel scrap, phase change material 201 heat absorption and melting become liquid, and when electric stove 1 does not produce high temperature flue gas or flue gas temperature is lower, phase change material 201 heat release, can continuously preheat the steel scrap on the one hand, energy-conserving effect is better, on the other hand, can avoid the wall of a well temperature to produce great fluctuation and reduce life. In one embodiment, the phase change material 201 contained in the filling cavity is molten salt or paraffin, although other phase change materials 201 are also suitable for the embodiment. Generally, the volume of the phase-change material 201 increases after melting from the solid phase to the liquid phase, so the volume of the filling cavity should be sufficient to accommodate the phase-change material 201 in the liquid phase.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an energy-conserving electric furnace flue gas processing system, includes the waste steel preheating well of being connected with electric stove waste steel entry and along flue gas burner, spray cooling device, dust removal unit and the discharge element that flue gas circulation direction connects gradually, waste steel preheating well disposes first flue gas outlet pipe, first flue gas outlet pipe with flue gas burner connects its characterized in that: the other end of the bypass pipe is connected to a flue gas pipeline between the flue gas combustion device and the spray cooling device, the bypass pipe and the first flue gas outlet pipe are respectively provided with a valve control unit, the valve control unit comprises a flow control valve and a stop valve, and the valve control unit on the first flue gas outlet pipe is positioned at the downstream of the bypass pipe side contact point.
2. The energy-saving electric furnace flue gas treatment system according to claim 1, wherein: and a flue gas mixing chamber is arranged on a flue gas pipeline between the flue gas combustion device and the spray cooling device, and the bypass pipe is connected to the flue gas mixing chamber.
3. The energy-saving electric furnace flue gas treatment system according to claim 1, wherein: and a smoke detection unit is arranged on the smoke inlet side of the spray cooling device and comprises a smoke temperature sensor and/or a smoke component analyzer, and the smoke detection unit is in interlocking control with the two groups of valve control units.
4. The energy-saving electric furnace flue gas treatment system according to claim 1 or 3, wherein: and a flue gas pipeline between the spray cooling device and the dust removal unit is provided with a spraying unit for spraying a dioxin adsorbent into the flue gas pipeline.
5. The energy-saving electric furnace flue gas treatment system according to claim 1, wherein: and a low-temperature flue gas mixing pipe is connected beside a flue gas pipeline between the spray cooling device and the dust removal unit.
6. The energy-saving electric furnace flue gas treatment system according to claim 1, wherein: the second flue gas outlet pipe is connected with the electric furnace flue, the second flue gas outlet pipe is connected to the first flue gas outlet pipe in a bypassing mode, and the bypassing point of the second flue gas outlet pipe is located at the upstream of the bypassing point of the bypassing pipe.
7. The energy-saving electric furnace flue gas treatment system according to claim 6, wherein: and a two-inlet one-outlet three-way regulating valve is arranged at the side joint of the second flue gas outlet pipe.
8. The energy-saving electric furnace flue gas treatment system according to claim 1, wherein: the dust removal unit comprises a bag-type dust remover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220362598.9U CN217110517U (en) | 2022-02-22 | 2022-02-22 | Energy-saving electric furnace flue gas treatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220362598.9U CN217110517U (en) | 2022-02-22 | 2022-02-22 | Energy-saving electric furnace flue gas treatment system |
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| CN217110517U true CN217110517U (en) | 2022-08-02 |
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| CN202220362598.9U Active CN217110517U (en) | 2022-02-22 | 2022-02-22 | Energy-saving electric furnace flue gas treatment system |
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