CN113237447A - Method for estimating thickness of carbon brick on side wall of blast furnace hearth - Google Patents
Method for estimating thickness of carbon brick on side wall of blast furnace hearth Download PDFInfo
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- CN113237447A CN113237447A CN202110429142.XA CN202110429142A CN113237447A CN 113237447 A CN113237447 A CN 113237447A CN 202110429142 A CN202110429142 A CN 202110429142A CN 113237447 A CN113237447 A CN 113237447A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
- G01B21/085—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness using thermal means
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
- C21B7/06—Linings for furnaces
Abstract
The invention relates to the technical field of blast furnace smelting, in particular to a method for estimating the thickness of a carbon brick on the side wall of a blast furnace hearth, which comprises the following steps: according to the current water temperature difference delta t of the cooling water inlet and outlet in the target area on the side wall of the blast furnace hearthWater (W)Calculating to obtain the heat quantity Qs absorbed by cooling water in the target area per second; calculating the heat quantity Q transferred from the furnace shell to the air in the target areaShell(ii) a Combining the heat quantity Qs absorbed by cooling water in the target area per second and the heat quantity Q transferred to air by the furnace shellShellAnd estimating the thickness L of the carbon brick in the target area. According to the method, the thickness of the carbon brick of the hearth can be estimated through related parameters without measuring temperature through a galvanic couple.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a method for estimating the thickness of a carbon brick on the side wall of a blast furnace hearth.
Background
The blast furnace hearth is a key part for blast furnace production, the thickness of the carbon brick is a key for determining the service life of a first-generation furnace, and through long-term production, the hearth temperature measuring thermocouples are damaged in different degrees, even all the thermocouples in the same direction are damaged, and because of many reasons for damage, the damage of all the thermocouples in the direction does not necessarily represent that the carbon brick is completely corroded, but the corrosion condition of the carbon brick at the position lacks a monitoring means, and if the carbon brick is burnt through, the consequences are extremely serious.
Disclosure of Invention
According to the method for estimating the thickness of the carbon brick on the side wall of the blast furnace hearth, the thickness of the carbon brick of the hearth can be estimated through related parameters without measuring temperature through a galvanic couple.
The invention provides a method for estimating the thickness of a carbon brick on the side wall of a blast furnace hearth, which comprises the following steps:
according to the current water temperature difference delta t of the cooling water inlet and outlet in the target area on the side wall of the blast furnace hearthWater (W)Calculating to obtain the heat quantity Qs absorbed by cooling water in the target area per second;
calculating the heat quantity Q transferred from the furnace shell to the air in the target areaShell；
Combining the heat quantity Qs absorbed by cooling water in the target area per second and the heat quantity Q transferred to air by the furnace shellShellAnd estimating the thickness L of the carbon brick in the target area.
Further, the current water temperature difference delta t according to the inlet and outlet of cooling water in a target area on the side wall of the blast furnace hearthWater (W)Calculating to obtain the heat Qs absorbed by the cooling water in the target area per second, specifically comprising the following steps:
measuring the current water temperature difference of the inlet and outlet of each cooling water pipe in the target area, and levelingObtaining the current water temperature difference delta t of the inlet and outlet of the cooling water through the mean valueWater (W)；
Measuring the flow velocity v of the cooling water in the current target areaWater (W)Obtaining the water quantity V flowing through the target area per secondWater (W)；
According to the current water temperature difference delta t of the cooling water in and out of the target areaWater (W)And an amount of water V flowing through the target area per secondWater (W)And obtaining the heat quantity Qs absorbed by the cooling water in the target area every second.
Further, the heat quantity Q transferred from the furnace shell to the air in the target area is calculatedShellThe method specifically comprises the following steps:
measuring the furnace shell temperature t of the target area respectivelyShellAnd the ambient temperature tAir (a)；
According to furnace shell temperature tShellAnd the ambient temperature tAir (a)Respectively calculating the radiation heat transfer Q from the furnace shell to the air in the target areaShell radiationAnd convection heat transfer Q from the furnace shell to the airShell convection；
Radiation heat transfer Q from furnace shell to air in target areaShell radiationAnd convection heat transfer Q from the furnace shell to the airShell convectionThe summation obtains the heat Q transferred from the furnace shell to the airShell。
Further, the heat quantity Qs absorbed by the cooling water per second in the combination target area and the heat quantity Q transferred to the air by the furnace shellShellEstimating the thickness L of the carbon brick in the target area, which specifically comprises the following steps:
calculating the convective heat transfer coefficient alpha of the cooling water in the cooling water pipe;
according to the convective heat transfer coefficient alpha, the heat quantity Qs absorbed by the cooling water in the target area per second and the average temperature t of the cooling water in the cooling water pipeWater (W)And calculating to obtain the inner wall temperature t of the cooling water pipe in the target areaIn the pipe；
According to the inner wall temperature t of the cooling water pipe in the target areaIn the pipeCalculating the temperature t of the outer wall of the cooling water pipeOutside of tubes；
According to the heat quantity Qs absorbed by cooling water in a target area per second and the heat quantity Q transferred to air by a furnace shellShellCalculating the total heat of the target areaIntensity of flow qGeneral assembly；
According to the heat quantity Qs absorbed by cooling water in a target area per second and the heat quantity Q transferred to air by a furnace shellShellAnd the outer wall temperature t of the cooling water pipeOutside of tubesCalculating the temperature T of the hot surface of the cooling wall where the cooling water pipe is located in the target areaHeat generation；
Total heat flux intensity q based on target areaGeneral assemblyAnd the temperature T of the hot face of the stave coolerHeat generationAnd estimating to obtain the thickness L of the carbon bricks in the target area.
Further, the convection heat transfer Q from the furnace shell to the air in the target area is calculatedShell convectionThe method also comprises the following steps:
and calculating the Reynolds number Re of the cooling water in the target area, and judging whether the cooling water in the target area is laminar flow or turbulent flow.
Further, the convection heat transfer Q from the furnace shell to the air in the target area is calculatedShell convectionThe method specifically comprises the following steps:
determining a natural convection heat transfer coefficient C and an index n according to a judgment result of cooling water in a target area;
based on the furnace shell temperature tShellAmbient temperature tAir (a)Natural convection heat transfer coefficient C and index n, and calculating convection heat transfer Q from the furnace shell to the air in the target areaShell convection。
Further, the estimation formula of the thickness L of the carbon brick in the target area is as follows:
in formula (9), T0Is an erosion isotherm of a dead iron layer in a blast furnace hearth, lambdaCarbon brickThe thermal conductivity of the carbon brick in the target area.
Further, the temperature t of the outer wall of the cooling water pipe in the target areaOutside of tubesThe calculation formula of (2) is as follows:
in the formula (5), rOuter coverIs the outer diameter of the cooling water pipe rInner partFor cooling the inner diameter of the water pipe lPipeIs the length of the cooling water pipe in the target area, lambdaSteelIs the heat conductivity of the cooling water pipe.
Further, the temperature t of the inner wall of the cooling water pipe in the target areaIn the pipeThe calculation formula of (2) is as follows:
in the formula (4), S1 represents the tube inner area of the cooling water tube in the target region.
Further, the temperature T of the hot surface of the cooling wall of the target area where the cooling water pipe is locatedHeat generationThe calculation formula of (2) is as follows:
in the formula (8), s1The distance between the cooling pipe in the target region and the hot surface of the cooling wall, S is the area of the cooling wall in the target region, and lambdaCopper (Cu)Cast copper is the material of the stave for its thermal conductivity.
In the invention, the thickness of the carbon brick of the hearth is estimated by the temperature difference of the cooling water entering and exiting the target area and the known parameters of the target area. The method of the invention can estimate the thickness of the carbon brick of the hearth by researching the cooling water in the cooling water pipe in the furnace without depending on a thermocouple.
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 according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a target area of a blast furnace 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.
Supposing that all temperature measuring couples in the E direction of the temperature measuring couple at a certain blast furnace hearth h1 are invalid, the sectional view of the target area is shown in figure 2, and the hearth structure sequentially comprises the following steps: carbon brick 1, stave 2, condenser tube 3, mud jacking material 4 and stove outer covering 5, wherein, condenser tube 3 is the steel pipe, and its main part sets up in stave 2. The surface of the cooling wall 2 contacted with the carbon brick 1 is the hot surface of the cooling wall. In the present embodiment, the material of the stave 2 is cast copper.
The temperature t of the furnace shell 5 at the position is measured by measuring the temperature of all four inlet water of the cooling wall at the position (target area) to be 40 ℃, the temperature of all outlet water to be 40.3 DEG CShellAt 50 deg.C, ambient air temperature (ambient temperature) tAir (a)The temperature was 30 ℃.
By measurement, the dimensions of the stave at this point are known: l (long): 2m, w (wide): 0.954m, h (high): 0.125 m; 3 inner diameter D of the cooling water pipe: 0.058m, the length of the cooling water pipe 3 in the cooling wall: lPipe: 2m, thickness s of the cooling water tube 3Pipe: 0.006 m; the distance s between the cooling water pipe 3 and the hot surface of the cooling wall1: 0.023 m; current flow velocity v of cooling water in target areaWater (W)＝2.2m/s。
Looking up the table, the heat conductivity coefficient lambda of the cast copperCopper (Cu)300W/m K, heat conductivity coefficient lambda of steel pipeSteel48W/m K, coefficient of thermal conductivity lambda of carbon brickCarbon brick＝16W/m*K。
As shown in fig. 1, the method for estimating the thickness of the carbon brick on the sidewall of the hearth of the blast furnace according to the embodiment includes:
101. according to the current water temperature difference delta t of the cooling water inlet and outlet in the target area on the side wall of the blast furnace hearthWater (W)Calculating to obtain the heat quantity Qs absorbed by cooling water in the target area per second; specifically, the method comprises the following steps:
1011. measuring the current water temperature difference of the inlet and outlet of each cooling water pipe in the target area, and averaging to obtain the current water temperature difference delta t of the inlet and outlet of the cooling waterWater (W)；
In this embodiment, four cooling water pipes are provided, the inlet water temperature is 40 ℃, the outlet water temperature is 40.3 ℃, the water temperature difference is expressed by thermodynamic temperature, and the current water temperature difference Δ tWater (W)＝0.3K。
1012. Measuring the flow velocity v of the cooling water in the current target areaWater (W)Obtaining the water quantity V flowing through the target area per secondWater (W)；
Current flow velocity v of cooling water in target areaWater (W)2.2m/s, the amount of water flowing through the target area per second, V, is calculatedWater (W)：
In the target area, there are four cooling water pipes, V according to equation (1)Water (W)＝0.02112592m3。
1013. According to the current water temperature difference delta t of the cooling water in and out of the target areaWater (W)And an amount of water V flowing through the target area per secondWater (W)Obtaining the heat quantity Qs absorbed by the cooling water in the target area per second:
Qs＝Vwater (W)*ρWater (W)*cWater (W)*ΔtWater (W) (2)
In the formula (2), ρWater (W)Is the density of water, cWater (W)Is the specific heat capacity of water;
qs 0.02112592m calculated from equation (2)3×992.2kg/m3×4178j/kgK×0.3K＝26272.6w。
102. Calculating the heat quantity Q transferred from the furnace shell to the air in the target areaShell(ii) a Specifically, the method comprises the following steps:
1021. measuring the furnace shell temperature t of the target area respectivelyShellAnd the ambient temperature tAir (a)；
Furnace shell 5 temperature t at target areaShellAt 50 deg.C, ambient air temperature (ambient temperature) tAir (a)The temperature was 30 ℃.
1022. According to furnace shell temperature tShellAnd the ambient temperature tAir (a)Respectively calculating the radiation heat transfer Q from the furnace shell to the air in the target areaShell radiationAnd convection heat transfer Q from the furnace shell to the airShell convection。
10221. Radiation heat transfer Q from furnace shell to air in target areaShell radiationThe calculation formula of (2) is as follows:
Qshell radiation＝ε*σb*S*(tShell+273)4 (6)
In the formula (6), the emissivity e of the material is 0.8, and the radiation constant σ of the black body isb＝5.67*10-8W/(m2*K4) The pipe internal area S of four cooling water pipes is 4 pi D lPipe；
Q is calculated from the formula (6)Shell radiation＝0.8×5.67*10-8W/(m2*K4)×(50K+273K)4×2m× 0.954m＝1001.7W。
Calculating the convective heat transfer Q from the furnace shell to the air in the target areaShell convectionThe method also comprises the following steps:
10222. calculating the Reynolds number Re of the cooling water in the target area, and judging whether the cooling water in the target area is laminar flow or turbulent flow;
wherein, vWater (W)The kinematic viscosity of water;
the cooling water in the target region is judged to be a sufficiently developed turbulent flow in the cooling pipe.
Calculating the convective heat transfer Q from the furnace shell to the air in the target areaShell convectionThe method specifically comprises the following steps:
10223. determining a natural convection heat transfer coefficient C and an index n according to a judgment result of cooling water in a target area;
since the cooling water in the target area is a well-developed turbulent flow in the cooling pipe, C is 0.10 and n is 1/3.
10224. Based on the furnace shell temperature tShellAmbient temperature tAir (a)Natural convection heat transfer coefficient C and index n, and calculating convection heat transfer Q from the furnace shell to the air in the target areaShell convection：
In the formula (7), the volume expansion coefficient
Wherein, the qualitative temperature tCharacterization of nature(30+50)/2 ═ 40 ℃; nu is kinematic viscosity coefficient of air, PrAir (a)Is the Plantt number, λ, of airAir (a)Is the thermal conductivity of air, d is the sizing size of the furnace shell, g is the acceleration of gravity, and S is the area of the stave in the target zone.
According to equation (7):
belongs to turbulent flow, C is 0.10, n is 1/3;
then Q isShell convection＝0.10(13731649361)1/3×0.02754W/m.K×20℃×2m×0.954m＝125.8W
1023. Radiation heat transfer Q from furnace shell to air in target areaShell radiationAnd convection heat transfer Q from the furnace shell to the airShell convectionThe summation obtains the heat Q transferred from the furnace shell to the airShell：
QShell＝QShell spokeShooting device+QShell convection＝1001.7W+125.8W＝1126.5W。
103. Combining the heat quantity Qs absorbed by cooling water in the target area per second and the heat quantity Q transferred to air by the furnace shellShellEstimating the thickness L of the carbon brick in the target area, specifically:
1031. calculating the convective heat transfer coefficient alpha of the cooling water in the cooling water pipe:
in the formula (3), the nussel number Nuf is 0.023 Re0.8*Pr0.4；
Calculated from equation (3):
1032. according to the convective heat transfer coefficient alpha, the heat quantity Qs absorbed by the cooling water in the target area per second and the average temperature t of the cooling water in the cooling water pipeWater (W)And calculating to obtain the inner wall temperature t of the cooling water pipe in the target areaIn the pipe：
In the formula (4), S1 represents the tube inner area of the cooling water tube in the target region, and S1 is 4 pi × D × lPipe。
Calculated from equation (4):
1033. according to the inner wall temperature t of the cooling water pipe in the target areaIn the pipeCalculating the temperature t of the outer wall of the cooling water pipeOutside of tubes：
In the formula (5), rOuter coverIs the outer diameter of the cooling water pipe rInner partFor cooling the inner diameter of the water pipe lPipeIs the length of the cooling water pipe in the target area, lambdaSteelThe heat conductivity coefficient of the cooling water pipe;
calculated from equation (5):
1034. according to the heat quantity Qs absorbed by cooling water in a target area per second and the heat quantity Q transferred to air by a furnace shellShellCalculating the total heat flow intensity q of the target areaGeneral assembly：
Calculated from equation (10):
1035. according to the heat quantity Qs absorbed by cooling water in a target area per second and the heat quantity Q transferred to air by a furnace shellShellAnd the outer wall temperature t of the cooling water pipeOutside of tubesCalculating the temperature T of the hot surface of the cooling wall where the cooling water pipe is located in the target areaHeat generation：
In the formula (8), s1The distance between the cooling pipe in the target area and the hot surface of the cooling wall, S is the pipe internal area of the cooling water pipe in the target area, and lambdaCopper (Cu)Thermal conductivity for cast copper;
calculated by the formula (8)
1036. Based onTotal heat flux intensity q of target areaGeneral assemblyAnd the temperature T of the hot face of the stave coolerHeat generationEstimating to obtain the thickness L of the carbon brick in the target area:
in formula (9), T0Is an erosion isotherm of a dead iron layer in a blast furnace hearth, lambdaCarbon brickThe thermal conductivity of the carbon brick in the target area;
calculated by formula (9)
In this embodiment, the correlation coefficient for water can be found by looking up table 1:
in the embodiment, the temperature measurement is not carried out through an electric couple, and the thickness of the hearth carbon brick is estimated through related parameters; the thickness of the carbon brick is calculated by measuring the temperature difference of water entering and leaving the cooling wall in the target area and utilizing the heat transfer principle; and calculating the thickness L of the carbon brick corresponding to the cooling wall of the target area by measuring the temperature difference of water inlet and outlet of four water pipes of one cooling wall by using the related known parameters of the cooling wall, the carbon brick and the furnace shell.
The estimation method of the embodiment is checked by the estimation method of the galvanic couple temperature measurement as follows:
three thermocouples on h1 altitude and P tangent are taken: thermocouple 1, thermocouple 2 and thermocouple 3, the temperature that three thermocouples measured the test point respectively is: t1, T2 and T3. As is known, the test point of thermocouple 1 is 730mm from the furnace shell, the test point of thermocouple 2 is 330mm from the furnace shell, and the test point of thermocouple 1 is x from the carbon brick erosion. Generally, the carbon bricks are eroded from the center to the outside.
The method for estimating the thickness of the carbon brick by adopting the galvanic couple temperature comprises the following steps:
(T1-T2)/(S2/λ)＝q＝(T3-T1)/(x/λ) (11)
in the formula (11), S is a distance from a test point of the thermocouple 1 to a test point of the thermocouple 2, q is a heat flow density, and λ is a thermal conductivity of the carbon brick.
As is known, T1 ═ 202 ℃, T2 ═ 135 ℃, T3 ═ 273 ℃, available according to equation (11): x is approximately equal to 420 mm;
thus, the thickness L730 mm + 1150mm of the carbon brick.
In summary, the results obtained by the estimation method of the galvanic couple temperature measurement are similar to those obtained by the estimation method of the embodiment, so that the accuracy of the estimation method of the invention can be proved.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for estimating the thickness of a carbon brick on the side wall of a blast furnace hearth is characterized by comprising the following steps:
according to the current water temperature difference delta t of the cooling water inlet and outlet in the target area on the side wall of the blast furnace hearthWater (W)Calculating to obtain the heat quantity Qs absorbed by cooling water in the target area per second;
calculating the heat quantity Q transferred from the furnace shell to the air in the target areaShell；
Combining the heat quantity Qs absorbed by cooling water in the target area per second and the heat quantity Q transferred to air by the furnace shellShellAnd estimating the thickness L of the carbon brick in the target area.
2. The blast furnace hearth side wall carbon brick thickness estimation of claim 1The method is characterized in that the current water temperature difference delta t according to the inlet and outlet of cooling water in a target area on the side wall of the blast furnace hearthWater (W)Calculating to obtain the heat Qs absorbed by the cooling water in the target area per second, specifically comprising the following steps:
measuring the current water temperature difference of the inlet and outlet of each cooling water pipe in the target area, and averaging to obtain the current water temperature difference delta t of the inlet and outlet of the cooling waterWater (W)；
Measuring the flow velocity v of the cooling water in the current target areaWater (W)Obtaining the water quantity V flowing through the target area per secondWater (W)；
According to the current water temperature difference delta t of the cooling water in and out of the target areaWater (W)And an amount of water V flowing through the target area per secondWater (W)And obtaining the heat quantity Qs absorbed by the cooling water in the target area every second.
3. The method according to claim 1, wherein the calculation of the heat quantity Q transferred from the furnace shell to the air in the target region is performedShellThe method specifically comprises the following steps:
measuring the furnace shell temperature t of the target area respectivelyShellAnd the ambient temperature tAir (a)；
According to furnace shell temperature tShellAnd the ambient temperature tAir (a)Respectively calculating the radiation heat transfer Q from the furnace shell to the air in the target areaShell radiationAnd convection heat transfer Q from the furnace shell to the airShell convection；
Radiation heat transfer Q from furnace shell to air in target areaShell radiationAnd convection heat transfer Q from the furnace shell to the airShell convectionThe summation obtains the heat Q transferred from the furnace shell to the airShell。
4. The method of estimating the thickness of the carbon bricks on the side wall of the hearth of the blast furnace according to claim 1, wherein the combination of the amount of heat Qs absorbed by the cooling water per second in the target region and the amount of heat Q transferred from the shell to the airShellEstimating the thickness L of the carbon brick in the target area, which specifically comprises the following steps:
calculating the convective heat transfer coefficient alpha of the cooling water in the cooling water pipe;
according to the convective heat transfer coefficient alpha, the heat quantity Qs absorbed by the cooling water in the target area per second and the average temperature t of the cooling water in the cooling water pipeWater (W)And calculating to obtain the inner wall temperature t of the cooling water pipe in the target areaIn the pipe；
According to the inner wall temperature t of the cooling water pipe in the target areaIn the pipeCalculating the temperature t of the outer wall of the cooling water pipeOutside of tubes；
According to the heat quantity Qs absorbed by cooling water in a target area per second and the heat quantity Q transferred to air by a furnace shellShellCalculating the total heat flow intensity q of the target areaGeneral assembly；
According to the heat quantity Qs absorbed by cooling water in a target area per second and the heat quantity Q transferred to air by a furnace shellShellAnd the outer wall temperature t of the cooling water pipeOutside of tubesCalculating the temperature T of the hot surface of the cooling wall where the cooling water pipe is located in the target areaHeat generation；
Total heat flux intensity q based on target areaGeneral assemblyAnd the temperature T of the hot face of the stave coolerHeat generationAnd estimating to obtain the thickness L of the carbon bricks in the target area.
5. The method according to claim 3, wherein the convective heat transfer Q from the shell to the air in the target area is calculatedShell convectionThe method also comprises the following steps:
and calculating the Reynolds number Re of the cooling water in the target area, and judging whether the cooling water in the target area is laminar flow or turbulent flow.
6. The method according to claim 5, wherein the convective heat transfer Q from the shell to the air in the target area is calculatedShell convectionThe method specifically comprises the following steps:
determining a natural convection heat transfer coefficient C and an index n according to a judgment result of cooling water in a target area;
based on the furnace shell temperature tShellAmbient temperature tAir (a)Natural convection heat transfer coefficient C and index n, and calculating convection heat transfer Q from the furnace shell to the air in the target areaShell convection。
7. The method for estimating the thickness of the carbon bricks on the side wall of the blast furnace hearth according to claim 4, wherein the estimation formula of the thickness L of the carbon bricks in the target area is as follows:
in formula (9), T0Is an erosion isotherm of a dead iron layer in a blast furnace hearth, lambdaCarbon brickThe thermal conductivity of the carbon brick in the target area.
8. The method of estimating the thickness of the carbon bricks on the sidewall of the blast furnace hearth according to claim 4, wherein the temperature t of the outer wall of the cooling water pipe in the target area is set to be the target temperatureOutside of tubesThe calculation formula of (2) is as follows:
in the formula (5), rOuter coverIs the outer diameter of the cooling water pipe rInner partFor cooling the inner diameter of the water pipe lPipeIs the length of the cooling water pipe in the target area, lambdaSteelIs the heat conductivity of the cooling water pipe.
9. The method of estimating the thickness of the carbon bricks on the side wall of the blast furnace hearth according to claim 4, wherein the temperature t of the inner wall of the cooling water pipe in the target area is determined by the thickness of the carbon bricks on the side wall of the blast furnace hearthIn the pipeThe calculation formula of (2) is as follows:
in the formula (4), S1 represents the tube inner area of the cooling water tube in the target region.
10. The method of estimating the thickness of a carbon brick on a side wall of a blast furnace hearth according to claim 4, wherein the method further comprises the step of estimating the thickness of a carbon brick on a side wall of a blast furnace hearth according to the thickness of a carbon brickIn that the temperature T of the hot surface of the cooling wall where the cooling water pipe is located in the target areaHeat generationThe calculation formula of (2) is as follows:
in the formula (8), s1The distance between the cooling pipe in the target region and the hot surface of the cooling wall, S is the area of the cooling wall in the target region, and lambdaCopper (Cu)Cast copper is the material of the stave for its thermal conductivity.
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