CN114371113B - Device and method for measuring influence of coke bulk on air permeability and liquid permeability of blast furnace - Google Patents
Device and method for measuring influence of coke bulk on air permeability and liquid permeability of blast furnace Download PDFInfo
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- CN114371113B CN114371113B CN202111486318.1A CN202111486318A CN114371113B CN 114371113 B CN114371113 B CN 114371113B CN 202111486318 A CN202111486318 A CN 202111486318A CN 114371113 B CN114371113 B CN 114371113B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- C21—METALLURGY OF IRON
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- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G01N2015/0873—Dynamic sorption, e.g. with flow control means
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Abstract
The invention provides a device and a method for measuring influence of coke bulk on blast furnace air permeability and liquid permeability, wherein the device comprises the following components: an inlet part for placing a coke block to be measured; one end of the first sealing part is connected with the access part, and the other end of the first sealing part is provided with a valve in a sealing way or is connected with the liquid inflow unit; the accommodating part is used for accommodating a coke block to be measured; the invention solves the problem that the existing index measurement method can not accurately predict the blast furnace condition, provides a new method for the characterization of the air permeability and the liquid permeability of coke, and is applicable to iron and steel enterprises and laboratory researches.
Description
[ Field of technology ]
The invention relates to the technical field of coke for blast furnace ironmaking, in particular to a device and a method for measuring influence of coke bulk on ventilation and liquid permeability of a blast furnace.
[ Background Art ]
The burden in the blast furnace is distributed in layers and descends, and the thickness of the material layer and the granularity of coke influence the air permeability and the liquid permeability of the blast furnace. After entering the blast furnace, the coke is subjected to the influence of chemical actions such as carbon melting loss reaction, alkali metal corrosion, slag iron corrosion and the like, the quality of the coke is continuously deteriorated, the strength of the coke is reduced, the block size of the coke is gradually reduced, and the coke is finally almost completely consumed in the blast furnace. Coke is one of the most important raw materials in the blast furnace smelting process, and the size of the coke can directly indicate the quality degradation degree. The coke has serious granularity degradation in the descending process of the blast furnace, so that the air permeability and liquid permeability in the furnace are poor, and the stable and smooth operation of the blast furnace is affected.
The ventilation and liquid permeability of the blast furnace is an important parameter of a monitoring index of the blast furnace, the forward running condition of the blast furnace is judged according to the pressure difference of coal gas passing through a material layer and the change rule of the dripping time of liquid in the furnace in a coke bed, whether the blast furnace has abnormal furnace conditions such as pipelines, suspended materials, material collapse and the like can be rapidly judged, and the blast furnace can be rapidly recovered forward running through timely adjustment.
Good air permeability means that the amount of air passing through the material layer is large, and good liquid permeability means that the amount of dripping through the material layer is large. Therefore, the change trend of the air permeability and the liquid permeability of the material layer in the furnace is controlled in time and accurately predicted, and the method is very necessary for assisting an operator in keeping the blast furnace stable and smooth in actual production. At this time, it is important to develop a new method for measuring the air permeability and liquid permeability of cokes of different grades.
Accordingly, there is a need to develop an apparatus and method for measuring the impact of coke bulk on blast furnace gas permeability to address deficiencies in the prior art to solve or mitigate one or more of the problems described above.
[ Invention ]
In view of the above, the invention provides a device and a method for measuring the influence of coke bulk on the air permeability and liquid permeability of a blast furnace, which solve the problem that the existing index measurement method can not accurately predict the furnace condition of the blast furnace, provide a new method for the characterization of the air permeability and liquid permeability of the coke, and are applicable to the research of iron and steel enterprises and laboratories.
In one aspect, the present invention provides an apparatus for measuring the effect of coke bulk on blast furnace gas permeability, the apparatus comprising:
an inlet part for placing a coke block to be measured;
one end of the first sealing part is connected with the access part, and the other end of the first sealing part is provided with a valve in a sealing way or is connected with the liquid inflow unit;
the accommodating part is used for accommodating a coke block to be measured;
And one end of the second sealing part is connected with the inlet part through the accommodating part, and the other end of the second sealing part is hermetically arranged or connected with the gas inflow unit through a valve.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, the accommodating portion is funnel-shaped, a gas-liquid connection channel is provided at the bottom of the funnel, and the gas inflow unit is connected to the accommodating portion through the gas-liquid connection channel.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, where a liquid flow identifier is provided on a side surface of the accommodating portion, and the liquid flow identifier is used for measuring the flow of the introduced liquid.
In accordance with aspects and any one of the possible implementations described above, there is further provided an implementation in which the inlet portion is a sealable on-off container lid.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, in which the second sealing portion is provided with a valve connected to the gas inflow unit, and the first sealing portion is provided in a sealing manner when the air permeability measurement is performed.
In the aspect and any possible implementation manner described above, there is further provided an implementation manner, in which the first sealing portion is provided with a valve connected to the liquid inflow unit, and the second sealing portion is provided in a sealing manner when the liquid permeability measurement is performed.
In accordance with aspects and any one of the possible implementations described above, there is further provided a method of determining the impact of coke bulk on blast furnace gas and liquid permeability, the method comprising:
S1: randomly selecting a plurality of coke blocks to be detected, and obtaining coke samples to be detected in different particle size ranges through particle size screening;
S2: dividing the coke sample to be measured in the same granularity range into a plurality of groups, and respectively placing the groups in a plurality of devices;
S3: measuring air permeability, presetting an air flow speed v Air flow and an air flow S Air flow of an air inflow unit, introducing air from a second sealing part, recording pressure P 1, stopping introducing air, recording a pressure value P 2 after a period of time, and calculating the pressure difference delta P before and after the air passes through a coke block to be measured, wherein the air permeability of a coke sample to be measured corresponds to the granularity range;
S4: performing liquid permeability measurement, presetting a liquid flow velocity v Liquid and its preparation method and a liquid flow rate S Liquid and its preparation method of a liquid inflow unit, injecting liquid from a first sealing part, immersing the liquid above the liquid level of a coke sample to be measured, recording the liquid flow rate S Starting from the beginning at the moment, stopping injecting the liquid, opening a valve at a second sealing part, closing the valve when the liquid descends to a certain height, recording the flow rate S Terminal (A) and the service time t of the liquid after dripping, and calculating the average time deltat before and after the liquid passes through the coke block to be measured, wherein the average time deltat corresponds to the liquid permeability of the coke sample to be measured in the particle size range;
s5: S2-S4 is continuously repeated on the coke to-be-detected samples with different particle size ranges, and the influence result of the coke bulk on the air permeability and the liquid permeability of the blast furnace is obtained.
In the aspect and any possible implementation manner as described above, further provided is an implementation manner, where the particle size screening in S1 is specifically: the screening particle size ranges include (0 mm,40 mm), [40mm,45mm ] and (45 mm, + -infinity) three kinds a coke sample.
In aspects and any possible implementation manner as described above, there is further provided an implementation manner, wherein the gas flow rate is controlled to v Air flow <5L/min; the liquid flow rate is controlled to be v Liquid and its preparation method <3L/min.
In the aspects and any possible implementation manner described above, there is further provided an implementation manner, where the pressure difference Δp is a pressure difference corresponding to a gas before and after passing through the coke material layer;
ΔP＝P2-P1；
the larger the delta P value, the better the air permeability of the coke, and conversely, the worse
Time t is the time required for the liquid to flow through the coke bed to drop to a certain height;
Δt is the average value of t of several groups in the same particle size range, and smaller Δt means better coke liquid permeability, and conversely worse coke liquid permeability.
Compared with the prior art, the invention can obtain the following technical effects: the invention improves the original problem that the ventilation and liquid permeability of the blast furnace can not be accurately predicted, also avoids the error between the simulation of the reaction process and the actual reaction of the blast furnace, directly characterizes the ventilation and liquid permeability of the blast furnace material layer by focusing the carbon block degree, and is used for guiding the blast furnace material distribution system. The method can simply, quickly and accurately detect the influence of cokes with different granularities on the air permeability and the liquid permeability of the blast furnace burden layer, and provides a new thought and a new method for analyzing and judging the air permeability and the liquid permeability of the coke bulk to different material layer thicknesses.
Of course, it is not necessary for any of the products embodying the invention to achieve all of the technical effects described above at the same time.
[ Description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of an apparatus according to an embodiment of the present invention.
[ Detailed description ] of the invention
For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
As shown in fig. 1, the present invention provides an apparatus for measuring the influence of coke bulk on blast furnace gas permeability, comprising:
an inlet part for placing a coke block to be measured;
one end of the first sealing part is connected with the access part, and the other end of the first sealing part is provided with a valve in a sealing way or is connected with the liquid inflow unit;
the accommodating part is used for accommodating a coke block to be measured;
And one end of the second sealing part is connected with the inlet part through the accommodating part, and the other end of the second sealing part is hermetically arranged or connected with the gas inflow unit through a valve.
The accommodating part is funnel-shaped, a gas-liquid connecting channel is arranged at the bottom of the funnel, and the gas inflow unit is connected with the accommodating part through the gas-liquid connecting channel. The side of the containing part is provided with a liquid flow mark for measuring the flow of the introduced liquid. The inlet portion is a sealable on-off container lid. When the air permeability is measured, the second sealing part is provided with a valve connected with the air inflow unit, and the first sealing part is arranged in a sealing way. When liquid permeability measurement is carried out, the first sealing part is provided with a valve connected with the liquid inflow unit, and the second sealing part is arranged in a sealing way.
The invention also provides a method for measuring the influence of coke bulk on the air permeability and liquid permeability of a blast furnace, which comprises the following steps:
S1: randomly selecting a plurality of coke blocks to be detected, and obtaining coke samples to be detected in different particle size ranges through particle size screening;
S2: dividing the coke sample to be measured in the same granularity range into a plurality of groups, and respectively placing the groups in a plurality of devices according to any one of claims 1-6;
S3: measuring air permeability, presetting an air flow speed v Air flow and an air flow S Air flow of an air inflow unit, introducing air from a second sealing part, recording pressure P 1, stopping introducing air, recording a pressure value P 2 after a period of time, and calculating the pressure difference delta P before and after the air passes through a coke block to be measured, wherein the air permeability of a coke sample to be measured corresponds to the granularity range;
S4: performing liquid permeability measurement, presetting a liquid flow velocity v Liquid and its preparation method and a liquid flow rate S Liquid and its preparation method of a liquid inflow unit, injecting liquid from a first sealing part, immersing the liquid above the liquid level of a coke sample to be measured, recording the liquid flow rate S Starting from the beginning at the moment, stopping injecting the liquid, opening a valve at a second sealing part, closing the valve when the liquid descends to a certain height, recording the flow rate S Terminal (A) and the service time t of the liquid after dripping, and calculating the average time deltat before and after the liquid passes through the coke block to be measured, wherein the average time deltat corresponds to the liquid permeability of the coke sample to be measured in the particle size range;
s5: S2-S4 is continuously repeated on the coke to-be-detected samples with different particle size ranges, and the influence result of the coke bulk on the air permeability and the liquid permeability of the blast furnace is obtained.
The granularity screening in the S1 specifically comprises the following steps: the screening particle size ranges include (0 mm,40 mm), [40mm,45mm ] and (45 mm, + -infinity) three kinds a coke sample. The gas flow rate is controlled to be v Air flow <5L/min; the liquid flow rate is controlled to be v Liquid and its preparation method <3L/min. The pressure difference delta P is the pressure difference corresponding to the gas before and after passing through the coke material layer;
ΔP＝P2-P1；
the larger the delta P value, the better the air permeability of the coke, and conversely, the worse
Time t is the time required for the liquid to flow through the coke bed to drop to a certain height;
Δt is the average value of t of several groups in the same particle size range, and smaller Δt means better coke liquid permeability, and conversely worse coke liquid permeability.
Example 1:
the invention provides a method for measuring the air permeability and liquid permeability of cokes with different particle sizes. The method avoids the problem that the existing index measurement method can not accurately predict the blast furnace condition, provides a new method for the characterization of the air permeability and the liquid permeability of the coke, and is suitable for both iron and steel enterprises and laboratory researches. The technical scheme adopted by the invention mainly comprises the following steps:
(1) Randomly selecting a plurality of coke in the furnace as the experimental sample, and screening by a particle size screening device to respectively obtain a plurality of standard coke to-be-detected samples A of <40mm, a plurality of standard coke to-be-detected samples B of 40-45mm and a plurality of standard coke to-be-detected samples C of >50 mm;
(2) Respectively placing part of samples A, B or C to be tested in a formulated air-permeable liquid-permeable model, introducing air, setting a gas flow velocity v Air flow and a pressure value P 1 of the initially introduced gas; another part of the sample A or B or C to be measured is respectively placed in a formulated air-permeable and liquid-permeable model, liquid is injected from the top of the device, and the liquid flow velocity v Liquid and its preparation method and the flow S 1 are set;
(3) After preparation, firstly, carrying out air permeability test on samples with the same granularity, recording a pressure value P 2 of gas after passing through a material layer, and completing 1 group of tests; secondly, performing liquid permeability test on coke samples with the same granularity, recording the dropping quantity S 2 and the dropping time t of liquid passing through a coke layer, and completing 1 group of tests;
(4) Continuously repeating the steps (2) and (3) for coke samples with the same granularity, and carrying out a plurality of groups of air permeability and liquid permeability test experiments;
(5) Counting the pressure values obtained by multiple groups of tests of samples with the same granularity to obtain the pressure difference (delta P) of the gas passing through the coke material layer; Δp characterizes how well coke of different particle sizes is permeable to blast furnaces. Similarly, counting the time t obtained by testing a plurality of groups of samples with the same granularity to obtain the change (delta S) of the dropping quantity of the liquid passing through the coke material layer and the service time (t); Δs characterizes the liquid permeability of coke layers of different particle sizes within the furnace.
In the step (1) of the technical scheme, a method for randomly selecting a plurality of pieces of coke charged into the furnace is adopted to prepare a detection sample, and the granularity of the coke is respectively <40mm, 40-45mm and >50mm.
In the step (2) of the above technical scheme, the gas flow rate is v Air flow =5l/min, and the liquid flow rate is v Liquid and its preparation method =3l/min;
In the step (4) of the technical scheme, at least 5 groups of repeated tests are carried out on the same coke granularity in order to ensure the accuracy of the experimental result.
In the step (5) of the above technical solution, the pressure difference (Δp) is the pressure value change corresponding to the gas before and after passing through the coke layer; the drop change (deltas) is the corresponding change in flow rate of the liquid before and after passing through the coke bed.
In the step (5) of the technical scheme, the larger the delta P value is, the better the air permeability of the coke layer in the furnace is, and the worse the air permeability is otherwise; the larger Δs value means the better the liquid permeability in the blast furnace, and conversely, the worse the liquid permeability.
Example 2:
(1) Randomly selecting a plurality of coke in a furnace of a certain steel mill as the experimental sample, and screening the coke to obtain 40 standard coke samples A to be detected, 40 standard coke samples B to be detected, with the particle size of 40-45mm, and 40 standard coke samples C to be detected, with the particle size of more than 50mm, by particle size screening;
(2) Firstly, 20 standard samples A smaller than 40mm are taken and placed in a ventilation and liquid permeability device (ensuring the sealing of a model), air is introduced from the bottom of the model, a pressure value P 1 is recorded, and the flow rate of the introduced air is set to be 5L/min;
(3) After preparation, carrying out air permeability test on the sample, introducing air from the bottom of the model, and recording the top pressure P 2 after the gas passes through the coke layer after 5min to complete 1 group of tests;
(4) Continuously repeating the steps (2) and (3) on coke samples with the particle size of 40-45mm (sample B) and more than 50mm (sample C), and respectively performing 5 groups of air permeability test experiments;
(5) Taking 20 standard samples A smaller than 40mm, placing in a ventilation and liquid permeability device, injecting liquid from the top of the model to submerge coke to a certain height, recording the liquid volume S 1, and setting the liquid flow rate to be 3L/min;
(6) After preparation, performing liquid permeability test on the sample, controlling liquid to drop from the bottom of the device, and recording the liquid volume S 2 in the container and the liquid drop time t when the liquid drops to a certain height to complete 1 group of tests;
(7) Continuously repeating the steps (5) and (6) on coke samples with the particle size of 40-45mm (sample B) and more than 50mm (sample C), and respectively performing 5 groups of liquid permeability test experiments;
(8) 5 groups of tests are carried out on each sample, and the obtained pressure difference delta P and time t are counted, so that the final result is obtained: Δp A;ΔPB;ΔPC;tA;tB; tC.
The device and the method for measuring the influence of the coke bulk on the air permeability and the liquid permeability of the blast furnace provided by the embodiment of the application are described in detail. The above description of embodiments is only for aiding in the understanding of the method of the present application and its core ideas; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As referred to throughout the specification and claims, the terms "comprising," including, "and" includes "are intended to be interpreted as" including/comprising, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art is able to solve the technical problem within a certain error range, substantially achieving the technical effect. The description hereinafter sets forth a preferred embodiment for practicing the application, but is not intended to limit the scope of the application, as the description is given for the purpose of illustrating the general principles of the application. The scope of the application is defined by the appended claims.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or system comprising such elements.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, and is capable of numerous other combinations, modifications and environments and is capable of changes or modifications within the scope of the inventive concept as expressed herein, either as a result of the foregoing teachings or as a result of the knowledge or technology of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the application are intended to be within the scope of the appended claims.
Claims (4)
1. A method of determining the impact of coke bulk on blast furnace gas and liquid permeability, the method being carried out by an apparatus for determining the impact of coke bulk on blast furnace gas and liquid permeability, the apparatus comprising:
an inlet part for placing a coke block to be measured;
one end of the first sealing part is connected with the access part, and the other end of the first sealing part is provided with a valve in a sealing way or is connected with the liquid inflow unit;
the accommodating part is used for accommodating a coke block to be measured;
One end of the second sealing part is connected with the inlet part through the accommodating part, and the other end of the second sealing part is hermetically arranged or connected with the gas inflow unit through a valve;
The accommodating part is funnel-shaped, a gas-liquid connecting channel is arranged at the bottom of the funnel, and the gas inflow unit is connected with the accommodating part through the gas-liquid connecting channel;
the side surface of the accommodating part is provided with a liquid flow mark for measuring the flow of the introduced liquid;
the inlet part is a container cover capable of being opened and closed in a sealing way;
when the air permeability is measured, the second sealing part is provided with a valve connected with the air inflow unit, and the first sealing part is arranged in a sealing way;
when liquid permeability measurement is carried out, the first sealing part is provided with a valve connected with the liquid inflow unit, and the second sealing part is arranged in a sealing way;
the method comprises the following steps:
S1: randomly selecting a plurality of coke blocks to be detected, and obtaining coke samples to be detected in different particle size ranges through particle size screening;
s2: dividing coke samples to be detected in the same granularity range into a plurality of groups, and respectively placing the groups in the device;
S3: measuring air permeability, presetting an air flow speed v Air flow and an air flow S Air flow of an air inflow unit, introducing air from a second sealing part, recording pressure P 1, stopping introducing air, recording a pressure value P 2 after a period of time, and calculating and obtaining a pressure difference delta P of the air before and after passing through a coke block to be measured, wherein the pressure difference delta P corresponds to the air permeability of a coke sample to be measured in the granularity range;
S4: the method comprises the steps of performing liquid permeability measurement, presetting a liquid flow velocity v Liquid and its preparation method and a liquid flow rate S Liquid and its preparation method of a liquid inflow unit, injecting liquid from a first sealing part, immersing the liquid above the liquid level of a coke sample to be measured, recording the liquid flow rate S Starting from the beginning at the moment, stopping injecting the liquid, opening a valve at a second sealing part, closing the valve when the liquid descends to a certain height, recording the flow rate S Terminal (A) and the use time t of the liquid after dripping, and calculating the average time deltat before and after the liquid passes through the coke block to be measured, wherein the average time deltat corresponds to the liquid permeability of the coke sample to be measured in a granularity range;
s5: S2-S4 is continuously repeated on the coke to-be-detected samples with different particle size ranges, and the influence result of the coke bulk on the air permeability and the liquid permeability of the blast furnace is obtained.
2. The method according to claim 1, wherein the particle size screening in S1 is specifically: the screening grain diameter range comprises 0mm-40mm three coke samples of 40mm-45mm and 45mm- ++.
3. The method of claim 1, wherein the gas flow rate is controlled at v Air flow <5L/min; the liquid flow rate is controlled to be v Liquid and its preparation method <3L/min.
4. The method of claim 1, wherein the pressure differential Δp is a pressure differential corresponding to the gas passing through the coke bed;
ΔP＝P2-P1；
the larger the delta P value, the better the air permeability of the coke, and conversely, the worse
Time t is the time required for the liquid to flow through the coke bed to drop to a certain height;
Δt is the average value of t of several groups in the same particle size range, and smaller Δt means better coke liquid permeability, and conversely worse coke liquid permeability.
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| CN113416807B (en) * | 2021-05-25 | 2022-05-20 | 鞍钢股份有限公司 | Charging method for improving air permeability in large-scale blast furnace |
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| CN103969164A (en) * | 2013-12-24 | 2014-08-06 | 河北钢铁股份有限公司邯郸分公司 | Device and method for determining gas permeability of cohesive zone coke layer |
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