阅读说明：本技术 一种热轧机及热轧机组 (Hot rolling mill and hot rolling unit ) 是由 文福 范锦龙 黄艳秋 舒刚 范卫华 王怡 张增磊 夏朝晖 罗新华 于 2020-07-24 设计创作，主要内容包括：本发明涉及一种热轧机,轧机出口处设有喷淋位和位于喷淋位下游的抽尘位；在喷淋位,于带钢运行通道上方和/或下方布置有雾化喷嘴；在抽尘位布置有抽尘风管并且抽尘风管的抽风口位于带钢运行通道上方。另外还涉及一种热轧机组,至少其中一台热轧机采用上述热轧机。本发明通过在轧机出口处布置雾化喷嘴和抽尘风管,雾化喷嘴喷吹的雾化水与高温烟气接触后快速蒸发,在避免使钢板表面温度明显降低的情况下,可使烟气温度降低、热压降低,烟气体积显著地减少,再由抽尘风管捕集去除；通过雾化喷嘴与抽尘风管相结合,能有效地减少系统处理烟气量,减少后续配套设施的设计处理风量,显著地降低热轧系统的投资和运行能耗。(The invention relates to a hot rolling mill, wherein a spraying position and a dust extraction position positioned at the downstream of the spraying position are arranged at the outlet of the rolling mill; atomizing nozzles are arranged above and/or below the strip steel operation channel at the spraying position; a dust exhaust pipe is arranged at the dust exhaust position, and an air exhaust opening of the dust exhaust pipe is positioned above the strip steel running channel. In addition, the hot rolling mill group is also related, and at least one hot rolling mill adopts the hot rolling mill. According to the invention, the atomizing nozzle and the dust exhaust air pipe are arranged at the outlet of the rolling mill, atomized water sprayed by the atomizing nozzle is quickly evaporated after contacting with high-temperature flue gas, the temperature of the flue gas can be reduced, the hot pressing is reduced under the condition of avoiding obviously reducing the surface temperature of a steel plate, the volume of the flue gas is obviously reduced, and the flue gas is collected and removed by the dust exhaust air pipe; by combining the atomizing nozzle with the dust exhaust pipe, the flue gas treatment capacity of the system can be effectively reduced, the designed treatment capacity of subsequent supporting facilities can be reduced, and the investment and the operation energy consumption of the hot rolling system can be remarkably reduced.)

1. A hot rolling mill comprising a roll stand and rolls arranged on said roll stand, characterized in that: a spraying position and a dust extraction position are arranged at the outlet of the rolling mill; at the spraying position, atomizing nozzles are arranged above and/or below the strip steel operation channel and are connected with a water supply pipe and a medium gas supply pipe; a dust extraction air pipe is arranged at the dust extraction position, and an air extraction opening of the dust extraction air pipe is positioned above the strip steel running channel; and the dust extraction position is arranged at the downstream of the spraying position along the running direction of the strip steel.

2. The hot rolling mill of claim 1, wherein the atomization parameters of the atomizing nozzles are determined by the following method, and the atomization parameters include initial particle size of water mist, amount of water spray, angle of spray, and arrangement position of the atomizing nozzles:

s1, establishing a geometric model according to the outlet area of the rolling mill, arranging an air suction opening at a preset position, and performing grid division on the outlet area of the rolling mill by using preprocessing software;

s2, setting initial conditions, wherein the initial conditions comprise the surface temperature of the strip steel and dust source points; performing numerical simulation calculation of a continuous phase by solving a Reynolds average Navistokes equation, opening a DPM (differential Power model) after the calculation of the continuous phase reaches convergence, adding preset atomization parameters, and performing iteration of a discrete phase;

s3, after the calculation in S2 reaches convergence, analyzing the evaporation movement time of the water mist under the preset atomization parameters and the influence of the water mist on the high-temperature flue gas flow field, judging whether the preset atomization parameters are proper or not, if not, adjusting the atomization parameters, and performing the numerical simulation calculation in S2 again until the proper atomization parameters are obtained; wherein, the proper atomization parameter needs to reach the cooling target of the high-temperature flue gas flow field, and the vaporization quantity of the sprayed atomized water is in the target range;

in the numerical simulation, a turbulence model selects a readable k-model, a pressure velocity coupling term selects a PISO iterative algorithm, a momentum and energy equation adopts a second-order windward format, and turbulence kinetic energy and turbulence dissipation rate adopt a first-order windward format; the selected injection mode in the DPM model is a hollow conical nozzle, the particle type is Droplet, the material is liquid water, and the evaporation phase is H₂O。

3. The hot rolling mill of claim 2, wherein the dust extraction parameters are determined by a method comprising air extraction rate, air extraction opening size, and relative position between the air extraction opening and the atomizing nozzle:

step one, after the atomization parameters are determined, giving a speed outlet boundary condition to an air suction opening, carrying out numerical simulation calculation on a continuous phase by solving a Reynolds average Navigneaux equation, opening a DPM (differential pulse-width modulation) model after the continuous phase calculation reaches convergence, adding the determined atomization parameters, and carrying out discrete phase calculation;

step two, after the calculation is converged, analyzing the flue gas flow field condition in the outlet area of the rolling mill, judging whether the endowed dust extraction parameter is appropriate, if not, adjusting the dust extraction parameter, and performing numerical simulation calculation in the step one again until the appropriate dust extraction parameter is obtained;

in the numerical simulation, a turbulence model selects a readable k-model, a pressure velocity coupling term selects a PISO iterative algorithm, a momentum and energy equation adopts a second-order windward format, and turbulence kinetic energy and turbulence dissipation rate adopt a first-order windward format; the selected injection mode in the DPM model is a hollow conical nozzle, the particle type is Droplet, the material is liquid water, and the evaporation phase is H₂O。

4. The hot rolling mill of claim 1, wherein: the dust exhaust air pipe is embedded in the rolling mill frame.

5. The hot rolling mill of claim 4, wherein: and a water supply pipe and a medium gas supply pipe above the strip steel operation channel are arranged in the dust extraction air pipe.

6. The utility model provides a hot rolling mill group, includes a plurality of hot rolling mills that arrange in proper order along belted steel traffic direction, its characterized in that: at least one of the hot rolling mills employs the hot rolling mill of any one of claims 1 to 5.

7. The hot rolling mill train of claim 6, wherein: the dust exhaust device is characterized by further comprising a smoke dust treatment mechanism, and each dust exhaust pipe is connected with the smoke dust treatment mechanism.

8. The hot rolling mill train of claim 7, wherein: the smoke dust treatment mechanism comprises a dehydration unit and a dust removal unit which are sequentially arranged along the smoke dust flowing direction.

9. The hot rolling mill train of claim 8, wherein: the dehydration unit comprises a cyclone dehydrator.

10. The hot rolling mill train of claim 8, wherein: the dust removal unit comprises a sintering plate dust remover.

Technical Field

The invention belongs to the technical field of metallurgical equipment, and particularly relates to a hot rolling mill and a hot rolling unit adopting the hot rolling mill.

Background

In the process of rolling the strip steel in a hot rolling production workshop of a steel enterprise, the temperature of the strip steel is very high (about 1000 ℃), and the strip steel and a roller rub at a high speed to generate a large amount of high-temperature dust-containing smoke at the rolling mill. The steel rolling process with relaxed requirement on the rolling temperature of the strip steel generally adopts a dust suppression mode of spraying water or atomized water, and water drops contact and agglomerate with dust particles in smoke and then fall to the surface of the strip steel to realize the effect of purifying the smoke. However, for some hot rolled products with very thin thickness, the requirement on the temperature of the strip steel in the rolling process is strict, and a large amount of water drops on the surface of the strip steel to reduce the temperature of the strip steel and influence the product quality, so that an external dust hood way is adopted, a top suction dust hood is arranged near the outlet or the inlet of a rolling mill, the top or the side part of the dust hood is connected with a dust removal pipeline, and the generated high-temperature dust-containing flue gas is collected by the dust hood and then is conveyed to a dust remover for purification and then reaches the standard to be discharged; because the dust hood is arranged outside the rolling mill, a large amount of ambient wild wind is inevitably mixed into the collected flue gas, so that the treatment air volume of purification facilities such as a dust remover is increased, and the initial investment and the operating cost of the system are high; meanwhile, in order to effectively control the overflowing smoke, the size of the external dust hood is large, a large space between the racks of the rolling mill is occupied, the dust hood needs to be removed firstly during equipment maintenance between the racks, and maintenance time and cost are increased.

Disclosure of Invention

The invention relates to a hot rolling mill and a hot rolling unit adopting the hot rolling mill, which can at least solve part of defects in the prior art.

The invention relates to a hot rolling mill, which comprises a rolling mill frame and a roller arranged on the rolling mill frame, wherein a spraying position and a dust extraction position are arranged at an outlet of the rolling mill; at the spraying position, atomizing nozzles are arranged above and/or below the strip steel operation channel and are connected with a water supply pipe and a medium gas supply pipe; a dust extraction air pipe is arranged at the dust extraction position, and an air extraction opening of the dust extraction air pipe is positioned above the strip steel running channel; and the dust extraction position is arranged at the downstream of the spraying position along the running direction of the strip steel.

As one embodiment, the atomization parameters of the atomizing nozzle are determined by the following method, wherein the atomization parameters comprise the initial water mist particle size, the water spraying amount, the spraying angle and the arrangement position of the atomizing nozzle:

s1, establishing a geometric model according to the outlet area of the rolling mill, arranging an air suction opening at a preset position, and performing grid division on the outlet area of the rolling mill by using preprocessing software;

s2, setting initial conditions, wherein the initial conditions comprise the surface temperature of the strip steel and dust source points; performing numerical simulation calculation of a continuous phase by solving a Reynolds average Navistokes equation, opening a DPM (differential Power model) after the calculation of the continuous phase reaches convergence, adding preset atomization parameters, and performing iteration of a discrete phase;

s3, after the calculation in S2 reaches convergence, analyzing the evaporation movement time of the water mist under the preset atomization parameters and the influence of the water mist on the high-temperature flue gas flow field, judging whether the preset atomization parameters are proper or not, if not, adjusting the atomization parameters, and performing the numerical simulation calculation in S2 again until the proper atomization parameters are obtained; wherein, the proper atomization parameter needs to reach the cooling target of the high-temperature flue gas flow field, and the vaporization quantity of the sprayed atomized water is in the target range;

in the numerical simulation, a turbulence model selects a Realizblek-model, a pressure velocity coupling term selects a PISO iterative algorithm, a momentum and energy equation adopts a second-order windward format, and turbulence kinetic energy and turbulence dissipation rate adopt a first-order windward format; selection in DPM modelThe spray mode is selected from hollow conical nozzle, particle type is selected from Droplet, material is selected from liquid water, evaporation phase is selected from H₂O。

As one embodiment, the dust extraction parameters are determined by the following method, and the dust extraction parameters comprise the air extraction amount, the size of the air extraction opening and the relative position between the air extraction opening and the atomizing nozzle:

step one, after the atomization parameters are determined, giving a speed outlet boundary condition to an air suction opening, carrying out numerical simulation calculation on a continuous phase by solving a Reynolds average Navigneaux equation, opening a DPM (differential pulse-width modulation) model after the continuous phase calculation reaches convergence, adding the determined atomization parameters, and carrying out discrete phase calculation;

step two, after the calculation is converged, analyzing the flue gas flow field condition in the outlet area of the rolling mill, judging whether the endowed dust extraction parameter is appropriate, if not, adjusting the dust extraction parameter, and performing numerical simulation calculation in the step one again until the appropriate dust extraction parameter is obtained;

in the numerical simulation, a turbulence model selects a Realizblek-model, a pressure velocity coupling term selects a PISO iterative algorithm, a momentum and energy equation adopts a second-order windward format, and turbulence kinetic energy and turbulence dissipation rate adopt a first-order windward format; the selected injection mode in the DPM model is a hollow conical nozzle, the particle type is Droplet, the material is liquid water, and the evaporation phase is H₂O。

In one embodiment, the dust extraction duct is embedded in the mill housing.

As one embodiment, a water supply pipe and a medium gas supply pipe above the strip steel running channel are arranged in the dust extraction air pipe.

The invention also relates to a hot rolling mill group which comprises a plurality of hot rolling mills arranged in sequence along the running direction of the strip steel, wherein at least one hot rolling mill adopts the hot rolling mill.

In one embodiment, the hot rolling mill train further includes a smoke treatment mechanism, and each of the dust exhaust ducts is connected to the smoke treatment mechanism.

As one embodiment, the soot treatment mechanism includes a dehydration unit and a dust removal unit arranged in this order in a soot flow direction.

As an embodiment, the dewatering unit comprises a cyclonic dewaterer.

As one embodiment, the dust removal unit includes a sintered plate dust remover.

The invention has at least the following beneficial effects:

according to the hot rolling mill and the hot rolling unit provided by the invention, the atomizing nozzle and the dust exhaust pipe are arranged at the outlet of the rolling mill, atomized water sprayed by the atomizing nozzle is rapidly evaporated after contacting with high-temperature flue gas, the temperature of the flue gas can be reduced, the hot pressing can be reduced, the volume of the flue gas is obviously reduced under the condition of avoiding obviously reducing the surface temperature of a steel plate, and the dust-containing flue gas with reduced hot pressing and volume is collected and removed by the dust exhaust pipe. By combining the atomizing nozzle with the dust exhaust air pipe, the flue gas treatment capacity of the system can be effectively reduced, and the designed treatment air capacity of subsequent supporting facilities is reduced, so that the investment and the operation energy consumption of the hot rolling system are remarkably reduced.

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 diagram of a hot rolling mill according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a hot rolling mill train according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.