CN109554513B - Method for obtaining conveying pipe diameter of desulfurizing agent for molten iron blowing desulfurization - Google Patents
Method for obtaining conveying pipe diameter of desulfurizing agent for molten iron blowing desulfurization Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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Abstract
The invention relates to a method for obtaining the conveying pipe diameter of a desulfurizer for molten iron blowing desulfurization, which comprises the following steps: determining the consumption W of the desulfurizer according to the molten iron blowing desulfurization process requirement and desulfurizer conditionpAnd the blowing time t, calculating the corresponding transport mass flow G of the desulfurizer particless: determining the appropriate range of the solid-gas ratio m of the desulfurizer in conveying according to the requirements of the molten iron blowing desulfurization process and the physical properties of the desulfurizer; calculating the carrier gas mass flow G based on the determined appropriate range of the solid-gas ratio mgA range of (d); calculating the inner diameter d of the spray gun nozzlenA range of (d); determining the air velocity U at the end of a desulfurizer conveying pipelineeA range of (d); calculating to obtain the proper range of the desulfurizer conveying pipe diameter D, wherein the calculation formula is as follows:
according to the influence rule of the actual process requirement of molten iron blowing desulfurization, the desulfurization reaction kinetic condition, the physical property of the desulfurizing agent and the like on the conveying parameters of the desulfurizing agent, the proper range of the conveying pipe diameter of the desulfurizing agent, which is in accordance with the actual conditions on site, can be scientifically and reasonably obtained.
Description
Technical Field
The invention belongs to the technical field of molten iron pretreatment, and particularly relates to a method for obtaining a conveying pipe diameter of a desulfurizing agent for molten iron blowing desulfurization.
Background
The desulfurizer injection conveying pipeline is used as a bridge for connecting the desulfurizer injection tank and the spray gun, and is of great importance to the molten iron injection desulfurization process.
Whether the pipe diameter of the conveying pipeline is reasonably selected or not can play a decisive role in the uniformity and stability of the process of conveying the desulfurizer:
when the diameter of the conveying pipe is too small, on one hand, the pressure loss of the desulfurizing agent in the conveying process is increased due to the reduction of the diameter of the conveying pipe, so that the power loss of the blowing process is increased, and on the other hand, in order to ensure that the desulfurizing agent amount conveyed to a molten iron bath in unit time can meet the process requirements, the conveying speed has to be increased, so that the pipeline abrasion is accelerated, the pressure loss of the desulfurizing agent in the conveying process is aggravated, and the strong vibration of blowing equipment is also caused;
on the contrary, when the selected value of the diameter of the conveying pipe is too large, although the increase of the diameter of the conveying pipe brings the benefit of reducing the pressure loss of the desulfurizer in the conveying process, under the condition of ensuring that the using amount of the desulfurizer can meet the process requirement, the conveying speed is forced to be reduced, especially the conveying speed of the starting end of the conveying pipe is possibly reduced to be below the deposition speed and the choking speed of the current conveying material, intermittent pulsation in the blowing process is easily caused, the pipeline is blocked in serious cases, and the continuity of the production process is influenced.
At present, a relatively suitable conveying pipe diameter of the desulfurizer is determined according to a relatively simple empirical formula and by referring to the pipeline parameters adopted in the existing molten iron blowing desulfurization project. However, due to the physical properties (density, particle size distribution, viscosity, etc.) of the transported materials, the actual process requirements for molten iron injection desulphurization, the molten iron tank conditions and the injection conditions, etc., all have different degrees of influence on the proper desulfurizer transport pipe diameter. When the various conditions of the target object have large deviation from the applicable range of the empirical formula, or no similar engineering pipeline parameters can be used as references, the desulfurizer conveying pipe diameter determined in such a way is not necessarily applicable.
Disclosure of Invention
The embodiment of the invention relates to a method for obtaining the conveying pipe diameter of a desulfurizing agent for molten iron blowing desulfurization, which can at least solve part of defects in the prior art.
The embodiment of the invention relates to a method for obtaining the conveying pipe diameter of a desulfurizer for molten iron blowing desulfurization, which comprises the following steps:
step one, determining the consumption W of the desulfurizer according to the molten iron blowing desulfurization process requirement and desulfurizer conditionpAnd blowing time t, and calculating the corresponding transport mass flow G of the desulfurizer particles according to the following formulas：
Determining a proper range of a solid-gas ratio m for conveying the desulfurizer according to the molten iron blowing desulfurization process requirement and the physical property of the desulfurizer;
thirdly, calculating the mass flow G of the carrier gas based on the determined appropriate range of the solid-gas ratio mgThe calculation formula is as follows:
step four, calculating the inner diameter d of the spray gun nozzlenThe calculation formula is as follows:
where ρ isgThe density of the carrier gas at the spray gun nozzle; a ismThe sound velocity of the solid-gas mixture corresponding to the appropriate range based on the determined solid-gas ratio m;
step five, determining the air flow speed U at the end of the desulfurizer conveying pipelineeThe calculation formula is as follows:
wherein, UcsThe deposition rate of the transported desulfurizing agent particles; peAnd PsThe carrier gas pressure at the end and the beginning of the desulfurizer conveying pipeline respectively;
sixthly, calculating to obtain the proper range of the desulfurizer conveying pipe diameter D, wherein the calculation formula is as follows:
wherein n is the number of spray gun nozzles.
As one example, in the second step, the method for determining the suitable range of the solid-gas ratio m of the desulfurizer to be conveyed comprises the following steps:determining the minimum value m of the solid-gas ratio m of desulfurizer transportation according to the safe blowing strength of molten iron blowing desulfurizationminAccording to the average particle size Z of the particles of desulfurizing agent currently usedaveDetermining the corresponding solid-gas ratio m for conveying the desulfurizeraveThe suitable range of the solid-gas ratio m for conveying the desulfurizing agent is mmin～mave。
As one of the examples, maveThe acquisition method comprises the following steps: according to the average particle size Z of the desulfurizing agent particles currently usedaveDetermining the critical velocity v to be reached for the corresponding particle to penetrate the molten metalcThe sound velocity a of the solid-gas mixturem＞vcAnd determining the corresponding maximum desulfurizing agent conveying solid-gas ratio as mave。
As one example, in the second step, the method for determining the suitable range of the solid-gas ratio m for conveying the desulfurizing agent further comprises: determining the upper limit value Z of the usable desulfurizing agent particle size Z according to the kinetic conditions of the molten iron desulfurization reactionmaxAnd determining the maximum value m of the solid-gas ratio m for conveying the desulfurizing agent according to the maximum value mmax，maveMust satisfy m or lessmax。
As one of the examples, mmaxThe acquisition method comprises the following steps: according to the ZmaxDetermining the critical velocity v to be reached for the corresponding particle to penetrate the molten metalcThe sound velocity a of the solid-gas mixturem＞vcAnd determining the corresponding maximum desulfurizing agent conveying solid-gas ratio as mmax。
As one embodiment, the method for obtaining the safe injection strength of molten iron injection desulphurization comprises the following steps:
s100, obtaining the conditions of a hot metal ladle, the blowing conditions and the medium conditions;
s200, calculating and obtaining the gas flow Q required to be blown into the metal molten pool according to the medium conditionsv；
S300, according to formula I ═ QvCalculating to obtain the current blowing strength I, wherein W is the molten iron loading amount in the medium condition;
s400, obtaining molten iron by calculation according to the condition of the molten iron tank, the blowing condition and the medium conditionThe maximum lifting height H of the liquid level of the molten pool near the wall of the tankW，maxAnd the maximum lifting height H of the liquid level of the molten pool near the outer wall of the spray gunL，max；
S500, according to the HW，maxAnd HL，maxJudging whether molten iron splashing or overflow risk is caused, if so, returning to S100 to adjust the blowing condition and/or the medium condition, and sequentially performing subsequent steps until the molten iron splashing or overflow risk is eliminated, wherein the blowing strength I at the moment is the corresponding safe blowing strength under the current working condition; if not, the current blowing intensity I is the corresponding safe blowing intensity under the current working condition.
As an example, in S500, H is judged under the condition that the hot metal ladle is coveredW，maxWhether or not it is greater than HFIf yes, returning to S100 to adjust the blowing condition and/or the medium condition, and sequentially carrying out the subsequent steps until HW，max≤HF；
If H is not covered on the hot metal ladleW，max＞HFAnd HL，max＞HF·if any condition in the alpha is satisfied, returning to S100 to adjust the blowing condition and/or the medium condition, and sequentially carrying out the subsequent steps until HW，max≤HFAnd HL，max≤HF·and α, wherein α is an overflow coefficient determined according to the condition of the hot-metal ladle.
in one embodiment, α is a value in the range of 1.1 to 1.3.
The embodiment of the invention at least has the following beneficial effects:
the method for obtaining the conveying pipe diameter of the desulfurizer for molten iron blowing desulfurization provided by the invention scientifically and reasonably obtains the proper range of the conveying pipe diameter of the desulfurizer, which is fit with the actual conditions on site, according to the actual process requirements of molten iron blowing desulfurization, and simultaneously considers the influence rule of desulfurization reaction kinetic conditions, physical properties of the desulfurizer and the like on the conveying parameters of the desulfurizer, and combines the actually measured characteristic parameters related to the physical properties of particles of the desulfurizer. Therefore, the embodiment can feed back the influence caused by the change of various factors such as the actual process requirement of molten iron injection desulfurization, the condition of the desulfurizing agent, the condition of the molten iron tank, the injection condition and the like in real time, and can provide theoretical guidance and reliable basis for the actual production process and the process design process.
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 flow chart of a method for obtaining a conveying pipe diameter of a desulfurizing agent for molten iron blowing desulfurization according to an embodiment of the present invention;
FIG. 2 shows the particle size of the desulfurizing agent and the critical velocity v required for the particles to invade molten metalcGraph of the relationship of (1);
FIG. 3 shows the solid-gas ratio m for desulfurizing agent delivery and the sonic velocity a of the solid-gas mixture according to the embodiment of the present inventionmGraph of the relationship of (1);
fig. 4 is a schematic flow chart of a method for obtaining the safe injection strength of molten iron pretreatment injection gas according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Example one
Referring to fig. 1, an embodiment of the present invention provides a method for obtaining a conveying pipe diameter of a desulfurizing agent for molten iron blowing desulfurization, including the following steps:
step one, determining desulfurization according to the molten iron blowing desulfurization process requirement and the desulfurizing agent conditionConsumption amount W of the agentpAnd blowing time t, and calculating the corresponding transport mass flow G of the desulfurizer particles according to the following formulas：
The molten iron blowing desulfurization process requirements are easily determined by a person skilled in the art according to working conditions, and comprise initial sulfur content of molten iron, final sulfur content, utilization rate level of a desulfurizing agent, molten iron temperature and molten iron loading amount; the above desulfurizing agent conditions include the kind of the desulfurizing agent and the composition of the desulfurizing agent.
Determining a proper range of a solid-gas ratio m for conveying the desulfurizer according to the molten iron blowing desulfurization process requirement and the physical property of the desulfurizer; the solid-gas conveying ratio m of the desulfurizer is also the mass flow ratio of desulfurizer particles to carrier gas.
Thirdly, calculating the mass flow G of the carrier gas based on the determined appropriate range of the solid-gas ratio mgThe calculation formula is as follows:
step four, calculating the inner diameter d of the spray gun nozzlenThe calculation formula is as follows:
where ρ isgThe density of the carrier gas at the spray gun nozzle; a ismThe sound velocity of the solid-gas mixture corresponding to the appropriate range based on the determined solid-gas ratio m;
step five, determining the air flow speed U at the end of the desulfurizer conveying pipelineeThe calculation formula is as follows:
wherein, UcsIs a transported desulfurizing agentThe deposition rate of the particles, which is related to the physical properties of the particles of the desulfurizing agent, is easily determined by the person skilled in the art according to the prior art; peAnd PsThe carrier gas pressure at the end and the beginning of the desulfurizer conveying pipeline respectively;
sixthly, calculating to obtain the proper range of the desulfurizer conveying pipe diameter D, wherein the calculation formula is as follows:
wherein n is the number of spray gun nozzles.
According to the method for obtaining the conveying pipe diameter of the desulfurizer for molten iron blowing desulfurization, provided by the embodiment, according to the actual process requirement of molten iron blowing desulfurization, the influence rule of desulfurization reaction kinetic conditions, physical properties of the desulfurizer and the like on the conveying parameters of the desulfurizer is considered, and the proper range of the conveying pipe diameter of the desulfurizer, which is in accordance with the actual field conditions, is scientifically and reasonably obtained by combining the actually measured characteristic parameters related to the physical properties of particles of the desulfurizer. Therefore, the embodiment can feed back the influence caused by the change of various factors such as the actual process requirement of molten iron injection desulfurization, the condition of the desulfurizing agent, the condition of the molten iron tank, the injection condition and the like in real time, and can provide theoretical guidance and reliable basis for the actual production process and the process design process.
In the step two, the method for determining the appropriate range of the solid-gas ratio m for conveying the desulfurizer comprises the following steps:
determining the minimum value m of the solid-gas ratio m of desulfurizer transportation according to the safe blowing strength of molten iron blowing desulfurizationminIt is understood that, based on the determined safe injection intensity of molten iron injection desulfurization, corresponding to the maximum allowable injection gas (i.e., carrier gas) flow rate, corresponding to the minimum value m of the desulfurization agent transport solid-gas ratio mmin. According to the average particle size Z of the desulfurizing agent particles currently usedaveDetermining the corresponding solid-gas ratio m for conveying the desulfurizeraveThe suitable range of the solid-gas ratio m for conveying the desulfurizing agent is mmin～maveThe principle is as follows:
as shown in FIG. 2, the desulfurizing agent particle size and the critical velocity v to be achieved for the particles to intrude into the molten metalcThere is an inverse relationship, the larger the particle size of the desulfurizing agent, the greater the critical velocity vcThe smaller; as shown in FIG. 3, the sound velocity a of the solid-gas mixturemAnd the solid-gas ratio m of the desulfurizer transportation is also inversely related. For the sonic nozzle used in the spray gun, the sonic velocity a of the solid-gas mixture is required to be adjustedmGreater than the above-mentioned critical speed vcSo that the desulfurizing agent particles can intrude into the molten metal to effectively participate in the desulfurization reaction, and therefore, the average particle diameter Z of the desulfurizing agent particles used at present is determinedaveAnd the critical velocity v required to be reached based on the above-mentioned desulfurizing agent particle size and particle intrusion into the molten metalcThe corresponding relation between the particles can determine the critical speed v needed to be reached by the corresponding particles to invade the molten metalcAnd further according to the sound velocity a of the solid-gas mixturemIn the range > vcAnd the sound velocity a of the solid-gas mixturemThe corresponding relation between the solid-gas ratio m and the desulfurizer transportation can determine the corresponding solid-gas ratio m of the desulfurizer transportationaveIn which the maximum value is taken as maveThat is (it is understood that, in actual production, it is easy for those skilled in the art to determine a relatively suitable value in the range as the maximum value, and there is no dilemma that the value is not exhaustive in theory).
Further preferably, in the second step, the method for determining the suitable range of the solid-gas ratio m for conveying the desulfurizing agent further comprises: determining the upper limit value Z of the usable desulfurizing agent particle size Z according to the kinetic conditions of the molten iron desulfurization reactionmaxAnd determining the maximum value m of the solid-gas ratio m for conveying the desulfurizing agent according to the maximum value mmax，maveMust satisfy m or lessmaxI.e. to maveAnd mmaxFor comparison, if mave≤mmaxThen m isaveMeet the requirement if mave＞mmaxM may be determined as aboveaveIs selected to be an appropriate value, for example, a suitable range for setting the desulfurizing agent transport solid-gas ratio m to be mmin～mmax. Similarly, m is the same as the aboveaveTo obtain the principle phaseSame, mmaxThe acquisition method comprises the following steps: according to the ZmaxDetermining the critical velocity v to be reached for the corresponding particle to penetrate the molten metalcThe sound velocity a of the solid-gas mixturem＞vcAnd determining the corresponding maximum desulfurizing agent conveying solid-gas ratio as mmax。
Example two
The embodiment provides a method for obtaining the safe injection intensity of molten iron pretreatment injection gas, which can be used in the first embodiment, and the minimum value m of the solid-gas ratio m for conveying the desulfurizing agent is determined according to the obtained safe injection intensity of molten iron injection desulfurizationmin。
As shown in fig. 4, the method for obtaining the safe injection strength of molten iron pretreatment injection gas comprises the following steps:
s100, obtaining the conditions of a hot metal ladle, the blowing conditions and the medium conditions;
s200, calculating and obtaining the gas flow Q required to be blown into the metal molten pool according to the medium conditionsv；
S300, according to formula I ═ QvCalculating to obtain the current blowing strength I, wherein W is the molten iron loading amount in the medium condition;
s400, calculating and obtaining the maximum lifting height H of the liquid level of the molten pool near the wall of the molten iron tank according to the condition of the molten iron tank, the blowing condition and the medium conditionW，maxAnd the maximum lifting height H of the liquid level of the molten pool near the outer wall of the spray gunL，max；
S500, according to the HW，maxAnd HL，maxJudging whether molten iron splashing or overflow risk is caused, if so, returning to S100 to adjust the blowing condition and/or the medium condition, and sequentially performing subsequent steps until the molten iron splashing or overflow risk is eliminated, wherein the blowing strength I at the moment is the corresponding safe blowing strength under the current working condition; if not, the current blowing intensity I is the corresponding safe blowing intensity under the current working condition.
Wherein:
in the above S100, the molten iron tank conditions include a tank shape, a tank size, whether to cover the molten iron tank, and a temperature above a molten bath surfaceHeight H of free spaceF；
In the above S100, the blowing conditions include an immersion depth of the nozzle holes, a size of the nozzle holes, a number of the nozzle holes, a blowing pressure, and a blowing time;
in the above S100, the medium conditions include a desulfurizing agent condition, a carrier gas condition, and a molten iron condition, the desulfurizing agent condition includes a desulfurizing agent type, a desulfurizing agent composition, and a desulfurizing agent consumption, the carrier gas condition includes a carrier gas type and a carrier gas consumption, and the molten iron condition includes a molten iron component, a molten iron temperature, and a molten iron charge W;
in the above S200, the gas flow Q required to be blown into the molten metal bathvCalculated using the following formula:
Qv＝Qcg+Qpt+Qcr
wherein Q iscgFor carrier gas flow, QptQ is the flow rate of gas formed by phase change of the desulfurizer in the temperature rise processcrIs the net gas flow generated by chemical reaction in the temperature rising process of the desulfurizer. Wherein Q isptAnd QcrIs easily calculated and obtained by those skilled in the art according to the properties of the desulfurizing agent, the molten iron desulfurization temperature condition and other working conditions, and will not be described in detail herein.
In the above S400, HW，maxAnd HL，maxThe calculating method comprises the following steps: establishing a computational domain of fluid mechanics calculation according to the condition of the hot metal ladle and the condition of blowing, discretizing the computational domain, setting boundary conditions and initial conditions according to the condition of the hot metal ladle, the condition of blowing and the condition of media, iteratively solving until the calculation process converges to set iteration precision, and outputting flow field information in the whole computational domain. The calculation process is a general process for solving the fluid mechanics theory by using a numerical method, firstly, a spatial domain where a fluid object is located is scattered into discrete units which are mutually associated, such as tetrahedral and/or hexahedral units, then boundary conditions and initial conditions corresponding to the physical object are set on nodes contained in each unit, and finally, iterative solution is carried out by using a proper numerical solution method until the calculation process converges to set iterative precision, and at the moment, various kinds of nodes stored by the nodes of each discrete unit can be used for solvingFlow information including temperature, pressure, velocity, gas/liquid interface position, etc. obtains flow field information throughout the calculated domain. Based on this calculation idea, those skilled in the art can easily perform calculation based on the above flow information, and details are not described here.
According to the method for obtaining the safe injection strength of the molten iron pretreatment injection gas, the physical and chemical reaction theories are accurately applied to the calculation of the actual gas quantity injected into the metal molten pool according to the actual working conditions of the molten iron desulfurization process, the injection gas flow under the actual working conditions is scientifically and reasonably obtained by combining the fluid mechanics theory and the numerical solving method, and whether molten iron splashing or overflowing can be caused or not is judged according to the injection gas flow, so that the basis for adjusting process parameters is provided, and the safe injection strength of the injection gas is obtained. Therefore, the embodiment can feed back the influence caused by various working condition changes in real time, remarkably reduce the cost generated by continuous trial and error in the past, and provide theoretical guidance and reliable basis for the actual production process and the process design process.
Further preferably, in S500, the determination as to whether the risk of molten iron splashing or overflowing is caused may be performed based on the following manner:
(1) under the condition of capping the hot-metal ladle, H is judgedW，maxWhether or not it is greater than HFIf yes, returning to S100 to adjust the blowing condition and/or the medium condition, and sequentially carrying out the subsequent steps until HW，max≤HF；
(2) If H is not covered on the hot metal ladleW，max＞HFAnd HL，max＞HF·if any condition in the alpha is satisfied, returning to S100 to adjust the blowing condition and/or the medium condition, and sequentially carrying out the subsequent steps until HW，max≤HFAnd HL，max≤HF·and α, wherein α is an overflow coefficient determined according to the condition of the hot-metal ladle, the overflow coefficient is an empirical coefficient and can be determined according to the condition of the hot-metal ladle, in the embodiment, the overflow coefficient α is a value within a range of 1.1-1.3, the upper limit is taken for a high-thin hot-metal ladle, and the lower limit is taken for a short-fat hot-metal ladle.
EXAMPLE III
The present embodiment describes a method for obtaining a conveying pipe diameter of a desulfurizing agent for molten iron blowing desulfurization according to an actual production condition.
Step one, molten iron blowing desulfurization process requirements and desulfurizer conditions are given, wherein the initial sulfur content of the molten iron is 350ppm, the end point sulfur content of the process requirements is 50ppm, the utilization rate level of the desulfurizer is 11.7%, the temperature of the molten iron is 1350 ℃, the loading capacity of the molten iron is 150t, the desulfurizer is lime powder, 90% of CaO active ingredients, the average particle size is 0.5mm, and the consumption of the desulfurizer is Wp750kg, and 10min of blowing time, the transport mass flow G of the desulfurizer particles can be calculated according to the following formulasThe concentration of the active carbon is 75kg/min,
determining a proper range of a solid-gas conveying ratio m of the desulfurizer, namely a proper range of a mass flow ratio of desulfurizer particles to carrier gas according to the molten iron blowing desulfurization process requirement and the physical properties of the desulfurizer particles; specifically, the upper limit Z of the range of the usable desulfurizing agent particle size Z is determined according to the dynamic conditions of the molten iron desulfurization reaction measured by experimentsmax1.5mm, and the size of the desulfurizing agent particles and the critical velocity v to be reached for the particles to penetrate into the molten metalcThere is an inverse correlation relationship as shown in FIG. 2, the solid-gas ratio m of the desulfurizer to the sound velocity a of the solid-gas mixturemThere is an inverse correlation relationship as shown in FIG. 3, in order to make the solid-gas mixture reach a sufficient speed at the nozzle outlet, the value of the solid-gas ratio m for conveying the desulfurizing agent cannot be too large, when Z is ZmaxAt 1.5mm, m reaches a maximum value of mmax175kg/kg, in contrast, the lower limit value of the desulfurizing agent conveying solid-gas ratio m is determined by the molten iron blowing desulfurization process requirement, the excessively small value of m can increase the using amount of carrier gas and the metal spraying amount and the lost heat, and the m can be obtained by combining the requirement of safe blowing strengthmin35kg/kg, so that the applicable range of the solid-gas ratio m of the desulfurizer in conveying can be determined to be 35-175kg/kg, finally according to the average particle size Z of the currently actually used desulfurizing agent particlesaveDetermining the upper limit m of the range of the suitable conveying solid-gas ratio m for 0.5mmaveAt 45kg/kg, it can be seen that maveNot more than mmaxThen the suitable conveying solid-gas ratio m can be obtained and ranges from 35kg/kg to 45 kg/kg;
step three, calculating the mass flow G of the carrier gas corresponding to the proper range of the solid-gas ratio m by the following formulagThe range of (A) is 1.67 to 2.14kg/min,
step four, calculating the inner diameter d of the spray gun nozzle by the following formulanThe range of (A) is 12-16 mm,
step five, determining the air flow speed U of the terminal of the desulfurizer conveying pipeline through the following inequalityeThe range of (A) is 30 to 40m/s,
wherein, UcsThe deposition speed of the transported desulfurizer particles is related to the physical properties of the desulfurizer particles, and the experimental determination is 9.14 m/s;
sixthly, calculating by the following formula to obtain the desulfurizer conveying pipe diameter D with the proper range of 22-30 mm,
wherein the number n of nozzles is taken to be 2.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A method for obtaining the conveying pipe diameter of a desulfurizer for molten iron blowing desulfurization is characterized by comprising the following steps:
step one, determining the consumption W of the desulfurizer according to the molten iron blowing desulfurization process requirement and desulfurizer conditionpAnd blowing time t, and calculating the corresponding transport mass flow G of the desulfurizer particles according to the following formulas：
Determining a proper range of a solid-gas ratio m for conveying the desulfurizer according to the molten iron blowing desulfurization process requirement and the physical property of the desulfurizer; the method for determining the appropriate range of the solid-gas ratio m for conveying the desulfurizing agent comprises the following steps: determining the minimum value m of the solid-gas ratio m of desulfurizer transportation according to the safe blowing strength of molten iron blowing desulfurizationminAccording to the average particle size Z of the particles of desulfurizing agent currently usedaveDetermining the corresponding solid-gas ratio m for conveying the desulfurizeraveThe suitable range of the solid-gas ratio m for conveying the desulfurizing agent is mmin～mave；
Thirdly, calculating the mass flow G of the carrier gas based on the determined appropriate range of the solid-gas ratio mgThe calculation formula is as follows:
step four, calculating the inner diameter d of the spray gun nozzlenThe calculation formula is as follows:
where ρ isgThe density of the carrier gas at the spray gun nozzle; a ismThe sound velocity of the solid-gas mixture corresponding to the appropriate range based on the determined solid-gas ratio m;
step five, determining the end of the desulfurizer conveying pipelineAir velocity UeThe calculation formula is as follows:
wherein, UcsThe deposition rate of the transported desulfurizing agent particles; peAnd PsThe carrier gas pressure at the end and the beginning of the desulfurizer conveying pipeline respectively;
sixthly, calculating to obtain the proper range of the desulfurizer conveying pipe diameter D, wherein the calculation formula is as follows:
wherein n is the number of spray gun nozzles.
2. The method for obtaining the diameter of a desulfurizing agent-conveying pipe for molten iron blowing desulfurization according to claim 1, wherein m isaveThe acquisition method comprises the following steps: according to the average particle size Z of the desulfurizing agent particles currently usedaveDetermining the critical velocity v to be reached for the corresponding particle to penetrate the molten metalcThe sound velocity a of the solid-gas mixturem＞vcAnd determining the corresponding maximum desulfurizing agent conveying solid-gas ratio as mave。
3. The method for obtaining the conveying pipe diameter of the desulfurizing agent for molten iron blowing desulfurization according to claim 1, wherein in the second step, the method for determining the suitable range of the solid-gas ratio m for conveying the desulfurizing agent further comprises the following steps: determining the upper limit value Z of the usable desulfurizing agent particle size Z according to the kinetic conditions of the molten iron desulfurization reactionmaxAnd determining the maximum value m of the solid-gas ratio m for conveying the desulfurizing agent according to the maximum value mmax，maveMust satisfy m or lessmax。
4. The method for obtaining the diameter of the conveying pipe of the desulfurizing agent for molten iron blowing desulfurization according to claim 3, wherein m ismaxThe acquisition method comprises the following steps: according to the ZmaxDetermining the critical velocity v to be reached for the corresponding particle to penetrate the molten metalcThe sound velocity a of the solid-gas mixturem＞vcAnd determining the corresponding maximum desulfurizing agent conveying solid-gas ratio as mmax。
5. The method for obtaining the diameter of the delivery pipe of the desulfurizing agent for molten iron blowing desulfurization according to claim 1, wherein the method for obtaining the safe blowing strength of molten iron blowing desulfurization comprises:
s100, obtaining the conditions of a hot metal ladle, the blowing conditions and the medium conditions;
s200, calculating and obtaining the gas flow Q required to be blown into the metal molten pool according to the medium conditionsv；
S300, according to formula I ═ QvCalculating to obtain the current blowing strength I, wherein W is the molten iron loading amount in the medium condition;
s400, calculating and obtaining the maximum lifting height H of the liquid level of the molten pool near the wall of the molten iron tank according to the condition of the molten iron tank, the blowing condition and the medium conditionW，maxAnd the maximum lifting height H of the liquid level of the molten pool near the outer wall of the spray gunL，max；
S500, according to the HW，maxAnd HL，maxJudging whether molten iron splashing or overflow risk is caused, if so, returning to S100 to adjust the blowing condition and/or the medium condition, and sequentially performing subsequent steps until the molten iron splashing or overflow risk is eliminated, wherein the blowing strength I at the moment is the corresponding safe blowing strength under the current working condition; if not, the current blowing intensity I is the corresponding safe blowing intensity under the current working condition.
6. The method for obtaining the conveying pipe diameter of the desulfurizing agent for molten iron blowing desulfurization according to claim 5, characterized in that: s500, judging H under the condition that the hot metal ladle is coveredW，maxWhether or not it is greater than HFIf yes, returning to S100 to adjust the blowing condition and/or the medium condition, and sequentially carrying out the subsequent steps until HW，max≤HF；
If H is not covered on the hot metal ladleW，max＞HFAnd HL，max＞HF·if any condition in the alpha is satisfied, returning to S100 to adjust the blowing condition and/or the medium condition, and sequentially carrying out the subsequent steps until HW，max≤HFAnd HL，max≤HF·and α, wherein α is an overflow coefficient determined according to the condition of the hot-metal ladle.
7. the method for obtaining the conveying pipe diameter of the desulfurizing agent for molten iron blowing desulfurization according to claim 6, wherein α takes a value within a range of 1.1 to 1.3.
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