CN113237447B - Method for estimating thickness of carbon bricks on side wall of blast furnace hearth - Google Patents
Method for estimating thickness of carbon bricks on side wall of blast furnace hearth Download PDFInfo
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- CN113237447B CN113237447B CN202110429142.XA CN202110429142A CN113237447B CN 113237447 B CN113237447 B CN 113237447B CN 202110429142 A CN202110429142 A CN 202110429142A CN 113237447 B CN113237447 B CN 113237447B
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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 cooling water in and out in a target area on the side wall of a blast furnace hearth Water and its preparation method Calculating to obtain heat Qs absorbed by cooling water in the target area every second; calculating heat Q transferred from furnace shell to air in target area Shell and shell The method comprises the steps of carrying out a first treatment on the surface of the Combining the heat absorbed per second by the cooling water Qs in the target area with the heat transferred to the air Q by the furnace shell Shell and shell The thickness L of the carbon brick in the target area is estimated. According to the invention, the temperature measurement by a thermocouple is not needed, and the thickness of the carbon brick of the hearth can be estimated by the related parameters.
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 furnace hearth of the blast furnace is a key part in the production of the blast furnace, the thickness of the carbon bricks is a key for determining the service life of the furnace age, after long-term production, the furnace hearth temperature measuring couple is damaged to different degrees, even thermocouples in the same direction are all damaged, and the complete damage of the thermocouples in the direction is not necessarily represented that the carbon bricks are completely eroded due to the reason of the damage, but the carbon brick erosion condition lacks a monitoring means, and if the carbon bricks are once burnt through, the result is extremely serious.
Disclosure of Invention
According to the method for estimating the thickness of the carbon bricks on the side wall of the blast furnace hearth, provided by the invention, the temperature measurement is not needed through a thermocouple, and the thickness of the carbon bricks of the hearth can be estimated through related parameters.
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 cooling water in and out in a target area on the side wall of a blast furnace hearth Water and its preparation method Calculating to obtain heat Qs absorbed by cooling water in the target area every second;
calculating heat Q transferred from furnace shell to air in target area Shell and shell ；
Combining the heat absorbed per second by the cooling water Qs in the target area with the heat transferred to the air Q by the furnace shell Shell and shell The thickness L of the carbon brick in the target area is estimated.
Further, according to the current water temperature difference delta t of the cooling water in and out of the target area on the side wall of the blast furnace hearth Water and its preparation method The heat quantity Qs absorbed by the cooling water in the target area per second is calculated, and the method specifically comprises the following steps:
measuring the current water temperature difference of each cooling water pipe in and out in the target area, and averaging to obtain the current water temperature difference delta t of the cooling water in and out Water and its preparation method ；
Measuring the flow velocity v of cooling water in the current target area Water and its preparation method Obtaining the water quantity V flowing through the target area per second Water and its preparation method ；
According to the current water temperature difference delta t of the cooling water in the target area Water and its preparation method And the amount of water V flowing through the target area per second Water and its preparation method The heat quantity Qs absorbed by the cooling water per second in the target area is obtained.
Further, the heat quantity Q transferred to the air by the furnace shell in the target area is calculated Shell and shell The method specifically comprises the following steps:
measuring the furnace shell temperature t of the target region Shell and shell And ambient temperature t Air-conditioner ；
According to the furnace shell temperature t Shell and shell And ambient temperature t Air-conditioner Respectively calculating radiation heat transfer Q of furnace shell to air in target area Shell radiation And convection heat transfer Q of furnace shell to air Shell convection ；
Radiant heat transfer Q of furnace shell to air in target zone Shell radiation And convection heat transfer Q of furnace shell to air Shell convection Summing to obtain heat Q transferred from furnace shell to air Shell and shell 。
Further, the combination of the heat Qs absorbed by the cooling water per second in the target area and the heat Q transferred from the furnace shell to the air Shell and shell Estimating the thickness L of the carbon brick in the target area, which specifically comprises the following steps:
calculating a convection heat exchange coefficient alpha of cooling water in a cooling water pipe;
based on the convective heat transfer coefficient alpha, the heat quantity qos absorbed by the cooling water per second in the target area, and the average temperature t of the cooling water in the cooling water pipe Water and its preparation method Calculating to obtain the temperature t of the inner wall of the cooling water pipe in the target area In-pipe ；
According to the temperature t of the inner wall of the cooling water pipe in the target area In-pipe Calculating the temperature t of the outer wall of the cooling water pipe Outside of the tube ；
Based on the heat quantity Qs absorbed by cooling water per second in the target area and the heat quantity Q transferred from the furnace shell to the air Shell and shell Calculating the total heat flow intensity q of the target area Total (S) ；
Based on the heat quantity Qs absorbed by cooling water in the target area per second and the heat quantity Q transferred from the furnace shell to the air Shell and shell And cooling water pipe outer wall temperature t Outside of the tube Calculating the temperature T of the hot surface of the cooling wall where the cooling water pipe is positioned in the target area Heat of the body ；
Based on the total heat flow intensity q of the target area Total (S) And the temperature T of the hot face of the cooling wall Heat of the body And estimating to obtain the thickness L of the carbon brick in the target area.
Further, the convective heat transfer Q of the furnace shell to the air in the target area is calculated Shell convection Also included before is:
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 or turbulent.
Further, the convective heat transfer Q of the furnace shell to the air in the target area is calculated Shell convection Concrete packageThe method comprises the following steps:
according to the judging result of the cooling water in the target area, determining a natural convection heat exchange coefficient C and an index n;
based on the furnace shell temperature t Shell and shell Ambient temperature t Air-conditioner Calculating the convection heat transfer Q of the furnace shell to the air in the target area by the natural convection heat transfer coefficient C and the index n Shell convection 。
Further, the estimation formula of the thickness L of the carbon brick in the target area is as follows:
in the formula (9), T 0 Is the erosion isotherm lambda of the dead iron layer in the hearth of the blast furnace Carbon brick Is the thermal conductivity of the carbon brick in the target area.
Further, the outer wall temperature t of the cooling water pipe in the target area Outside of the tube The calculation formula of (2) is as follows:
in the formula (5), r Outer part For the external diameter of the cooling water pipe r Inner part For cooling water pipe inner diameter l Pipe Is the pipe length lambda of the cooling water pipe in the target area Steel and method for producing same Is the heat conductivity coefficient of the cooling water pipe.
Further, the temperature t of the inner wall of the cooling water pipe in the target area In-pipe The calculation formula of (2) is as follows:
in the formula (4), S1 is the area of the cooling water pipe in the target area.
Further, the temperature T of the hot surface of the cooling wall where the cooling water pipe is located in the target area Heat of the body The calculation formula of (2) is as follows:
in the formula (8), s 1 S is the area of the cooling wall in the target area, lambda is the distance from the cooling tube to the hot surface of the cooling wall in the target area Copper (Cu) Copper is the material of the cooling wall for its thermal conductivity.
In the invention, the thickness of the carbon brick of the hearth is estimated through the temperature difference of cooling water entering and exiting in the target area and the known parameters of the target area. According to the method, the thickness of the carbon bricks of the hearth can be estimated by researching cooling water in the cooling water pipe in the hearth without depending on a thermocouple.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method according to an embodiment of the invention;
fig. 2 is a schematic cross-sectional view of a blast furnace target area according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
Assuming that the temperature measuring couple in the E direction at the position of a hearth h1 of a blast furnace is completely invalid, the sectional view of the target area is changed to be shown as figure 2, and the hearth structure is as follows in sequence when the molten iron points to the air direction: the cooling water pipe 3 is a steel pipe, and a main body of the cooling water pipe 3 is arranged in the cooling wall 2. The surface of the cooling wall 2 contacted with the carbon bricks 1 is the cooling wall hot surface. In this embodiment, the material of the stave 2 is cast copper.
The temperature t of the furnace shell 5 is measured by measuring the temperature of four water inlets of the cooling wall at the position (target area) to be 40 ℃ and the temperature of water outlets to be 40.3 DEG C Shell and shell 50℃ambient air temperature (ambient temperature) t Air-conditioner Is 30 ℃.
The dimensions of the stave were measured and known here: l (long): 2m, w (width): 0.954m, h (high): 0.125m; cooling water pipe 3 internal diameter D: length of cooling water pipe 3 in stave china 0.058 m: l (L) Pipe : thickness s of cooling water pipe 3 of 2m Pipe :0.006m; distance s of cooling water pipe 3 from cooling wall hot surface 1 :0.023m; flow velocity v of cooling water in the current target area Water and its preparation method ＝2.2m/s。
The table look-up shows that the heat conductivity coefficient lambda of the cast copper Copper (Cu) =300W/m×k, coefficient of thermal conductivity λ of steel tube Steel and method for producing same Heat conductivity coefficient λ of carbon brick =48w/m×k Carbon brick ＝16W/m*K。
As shown in fig. 1, the method for estimating the thickness of the carbon brick on the side wall of the hearth of the blast furnace according to the embodiment comprises the following steps:
101. according to the current water temperature difference delta t of cooling water in and out in a target area on the side wall of a blast furnace hearth Water and its preparation method Calculating to obtain heat Qs absorbed by cooling water in the target area every second; specifically:
1011. measuring the current water temperature difference of each cooling water pipe in and out in the target area, and averaging to obtain the current water temperature difference delta t of the cooling water in and out Water and its preparation method ；
In the embodiment, four cooling water pipes are provided, the water inlet temperature is 40 ℃, the water outlet temperature is 40.3 ℃, the water temperature difference is expressed by thermodynamic temperature, and the current water temperature difference deltat Water and its preparation method ＝0.3K。
1012. Measuring the flow velocity v of cooling water in the current target area Water and its preparation method Obtaining the water quantity V flowing through the target area per second Water and its preparation method ；
Flow rate of cooling water in current target areav Water and its preparation method =2.2m/s, calculate the volume V of water flowing through the target area per second Water and its preparation method ：
In the target area, there are four cooling water pipes, V according to formula (1) Water and its preparation method ＝0.02112592m 3 。
1013. According to the current water temperature difference delta t of the cooling water in the target area Water and its preparation method And the amount of water V flowing through the target area per second Water and its preparation method The heat Qs absorbed by the cooling water per second in the target area is obtained:
Qs＝V water and its preparation method *ρ Water and its preparation method *c Water and its preparation method *Δt Water and its preparation method (2)
In the formula (2), ρ Water and its preparation method For density of water, c Water and its preparation method Is the specific heat capacity of water;
calculated from equation (2), qs= 0.02112592m 3 ×992.2kg/m 3 ×4178j/kgK×0.3K＝26272.6w。
102. Calculating heat Q transferred from furnace shell to air in target area Shell and shell The method comprises the steps of carrying out a first treatment on the surface of the Specifically:
1021. measuring the furnace shell temperature t of the target region Shell and shell And ambient temperature t Air-conditioner ；
Furnace shell 5 temperature t at target zone Shell and shell 50℃ambient air temperature (ambient temperature) t Air-conditioner Is 30 ℃.
1022. According to the furnace shell temperature t Shell and shell And ambient temperature t Air-conditioner Respectively calculating radiation heat transfer Q of furnace shell to air in target area Shell radiation And convection heat transfer Q of furnace shell to air Shell convection 。
10221. Radiant heat transfer Q of furnace shell to air in target zone Shell radiation The calculation formula of (2) is as follows:
Q shell radiation ＝ε*σ b *S*(t Shell and shell +273) 4 (6)
In formula (6), the emissivity epsilon=0.8 of the material, the radiation of a blackbodyConstant sigma b ＝5.67*10 -8 W/(m 2 *K 4 ) The area s=4pi D l in the four cooling water pipes Pipe ；
Q is calculated by the formula (6) Shell radiation ＝0.8×5.67*10 -8 W/(m 2 *K 4 )×(50K+273K) 4 ×2m× 0.954m＝1001.7W。
Calculating convective heat transfer Q of furnace shell to air in target zone Shell convection Also included before is:
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 or turbulent;
wherein v Water and its preparation method Is the kinematic viscosity of water;
the cooling water in the target area is determined to be a sufficiently developed turbulence in the cooling pipe.
Calculating convective heat transfer Q of furnace shell to air in target zone Shell convection The method specifically comprises the following steps:
10223. according to the judging result of the cooling water in the target area, determining a natural convection heat exchange coefficient C and an index n;
since the cooling water in the target area is a well developed turbulence inside the cooling tube, c=0.10, n=1/3.
10224. Based on the furnace shell temperature t Shell and shell Ambient temperature t Air-conditioner Calculating the convection heat transfer Q of the furnace shell to the air in the target area by the natural convection heat transfer coefficient C and the index n Shell convection ：
In the formula (7), the volume expansion coefficient
Wherein the qualitative temperature t Qualitative nature ＝(30+50)/2=40 ℃; v is the kinematic viscosity coefficient, pr of air Air-conditioner Is the Plandter number, lambda of air Air-conditioner And d is the sizing size of the furnace shell, g is the gravitational acceleration, and S is the area of the cooling wall in the target area.
According to formula (7):
belonging to turbulent flow, then c=0.10, n=1/3;
then Q Shell convection ＝0.10(13731649361) 1/3 ×0.02754W/m.K×20℃×2m×0.954m＝125.8W
1023. Radiant heat transfer Q of furnace shell to air in target zone Shell radiation And convection heat transfer Q of furnace shell to air Shell convection Summing to obtain heat Q transferred from furnace shell to air Shell and shell ：
Q Shell and shell ＝Q Shell radiation +Q Shell convection ＝1001.7W+125.8W＝1126.5W。
103. Combining the heat absorbed per second by the cooling water Qs in the target area with the heat transferred to the air Q by the furnace shell Shell and shell Estimating the thickness L of the carbon brick in the target area, specifically:
1031. calculating a convection heat exchange coefficient alpha of cooling water in a cooling water pipe:
in formula (3), nucelf=0.023×re 0.8 *Pr 0.4 ；
Calculated from equation (3):
1032. based on the convective heat transfer coefficient alpha, the heat quantity qos absorbed by the cooling water per second in the target area, and the average temperature t of the cooling water in the cooling water pipe Water and its preparation method Calculating to obtain the temperature t of the inner wall of the cooling water pipe in the target area In-pipe ：
In the formula (4), S1 is the area of the cooling water pipe in the target area, s1=4pi×djl Pipe 。
Calculated from equation (4):
1033. according to the temperature t of the inner wall of the cooling water pipe in the target area In-pipe Calculating the temperature t of the outer wall of the cooling water pipe Outside of the tube ：
In the formula (5), r Outer part For the external diameter of the cooling water pipe r Inner part For cooling water pipe inner diameter l Pipe Is the pipe length lambda of the cooling water pipe in the target area Steel and method for producing same The heat conductivity coefficient of the cooling water pipe;
calculated from equation (5):
1034. based on the heat quantity Qs absorbed by cooling water per second in the target area and the heat quantity Q transferred from the furnace shell to the air Shell and shell Calculating the total heat flow intensity q of the target area Total (S) ：
Calculated from equation (10):
1035. based on the heat quantity Qs absorbed by cooling water in the target area per second and the heat quantity Q transferred from the furnace shell to the air Shell and shell And cooling water pipe outer wall temperature t Outside of the tube Calculating the temperature T of the hot surface of the cooling wall where the cooling water pipe is positioned in the target area Heat of the body ：
In the formula (8), s 1 S is the area in the cooling water pipe in the target area, lambda, which is the distance between the cooling pipe in the target area and the hot surface of the cooling wall Copper (Cu) The heat conductivity coefficient of the cast copper;
calculated from the formula (8)
1036. Based on the total heat flow intensity q of the target area Total (S) And the temperature T of the hot face of the cooling wall Heat of the body Estimating the thickness L of the carbon brick in the target area:
in the formula (9), T 0 Is the erosion isotherm lambda of the dead iron layer in the hearth of the blast furnace Carbon brick The thermal conductivity coefficient of the carbon bricks in the target area;
calculated from the formula (9)
The correlation coefficient for water in this embodiment can be obtained by looking up table 1:
in the embodiment, the temperature is not measured through a thermocouple, and the thickness of the hearth carbon brick is estimated through related parameters; calculating the thickness of the carbon brick by measuring the temperature difference of water entering and exiting 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 in the target area by measuring the water inlet and outlet temperature difference of four water pipes of one cooling wall by using the known parameters related to the cooling wall, the carbon brick and the furnace shell.
The estimation method of the embodiment is proved by the estimation method of thermocouple temperature measurement:
taking three thermocouples on the h1 high line and the P tangent line: thermocouple 1, thermocouple 2 and thermocouple 3, the temperature that three thermocouples were located test point and were measured respectively is: t1, T2 and T3. It is known that the test point of the thermocouple 1 is 730mm from the furnace shell, the test point of the thermocouple 2 is 330mm from the furnace shell, and the test point of the thermocouple 1 is x from the erosion site of the carbon brick. Typically, carbon bricks erode outwardly from the center.
The method for estimating the thickness of the carbon brick by adopting the thermocouple temperature comprises the following steps:
(T1-T2)/(S2/λ)＝q＝(T3-T1)/(x/λ) (11)
in the formula (11), S is the distance from the test point of the thermocouple 1 to the test point of the thermocouple 2, q is the heat flux density, and λ is the thermal conductivity of the carbon brick.
As is known, t1=202 ℃, t2=135 ℃, t3=273 ℃, obtainable according to formula (11): x is approximately 420mm;
thus, the carbon brick thickness L is approximately 730mm+x is approximately 1150mm.
In summary, the result obtained by the thermocouple temperature measurement estimation method is similar to that obtained by the thermocouple temperature measurement estimation method in the embodiment, so that the accuracy of the thermocouple temperature measurement estimation method can be proved.
It should be understood that the specific order or hierarchy of steps in the processes disclosed are examples of exemplary approaches. Based on 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 meant 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 this detailed description, with each claim standing on its own as a separate preferred embodiment of this 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. As will be apparent 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.
The foregoing description 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, as used in the specification or claims, the term "comprising" is intended to be inclusive in a manner similar to the term "comprising," as 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 "non-exclusive or".
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (7)
1. A method for estimating the thickness of a carbon brick on the side wall of a blast furnace hearth, comprising the steps of:
according to the current water temperature difference delta t of cooling water in and out in a target area on the side wall of a blast furnace hearth Water and its preparation method Calculating to obtain heat Qs absorbed by cooling water in the target area every second;
calculating heat Q transferred from furnace shell to air in target area Shell and shell ；
Combining the heat absorbed per second by the cooling water Qs in the target area with the heat transferred to the air Q by the furnace shell Shell and shell Estimating the thickness L of the carbon brick in the target area;
calculating heat quantity Q transferred from furnace shell to air in target area Shell and shell The method specifically comprises the following steps:
measuring the furnace shell temperature t of the target region Shell and shell And ambient temperature t Air-conditioner ；
According to the furnace shell temperature t Shell and shell And ambient temperature t Air-conditioner Respectively calculating radiation heat transfer Q of furnace shell to air in target area Shell radiation And convection heat transfer Q of furnace shell to air Shell convection ；
Radiant heat transfer Q of furnace shell to air in target zone Shell radiation And convection heat transfer Q of furnace shell to air Shell convection Summing to obtain heat Q transferred from furnace shell to air Shell and shell ；
Calculating convective heat transfer Q of furnace shell to air in target zone Shell convection Also included before is:
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 or turbulent;
calculating furnace shell to air in target areaConvective heat transfer Q Shell convection The method specifically comprises the following steps:
according to the judging result of the cooling water in the target area, determining a natural convection heat exchange coefficient C and an index n;
based on the furnace shell temperature t Shell and shell Ambient temperature t Air-conditioner Calculating the convection heat transfer Q of the furnace shell to the air in the target area by the natural convection heat transfer coefficient C and the index n Shell convection ：
In the formula (7), the volume expansion coefficient beta and the qualitative temperature t Qualitative nature The method comprises the steps of carrying out a first treatment on the surface of the V is the kinematic viscosity coefficient, pr of air Air-conditioner Is the Plandter number, lambda of air Air-conditioner And d is the sizing size of the furnace shell, g is the gravitational acceleration, and S is the area of the cooling wall in the target area.
2. The method for estimating a thickness of a carbon brick on a side wall of a blast furnace hearth according to claim 1, wherein the current water temperature difference Δt for cooling water to be introduced and withdrawn is based on a target area on the side wall of the blast furnace hearth Water and its preparation method The heat quantity Qs absorbed by the cooling water in the target area per second is calculated, and the method specifically comprises the following steps:
measuring the current water temperature difference of each cooling water pipe in and out in the target area, and averaging to obtain the current water temperature difference delta t of the cooling water in and out Water and its preparation method ；
Measuring the flow velocity v of cooling water in the current target area Water and its preparation method Obtaining the water quantity V flowing through the target area per second Water and its preparation method ；
According to the current water temperature difference delta t of the cooling water in the target area Water and its preparation method And the amount of water V flowing through the target area per second Water and its preparation method The heat quantity Qs absorbed by the cooling water per second in the target area is obtained.
3. The blast furnace hearth sidewall carbon brick thickness estimation method according to claim 1, wherein the cooling water in the bonding target area is per secondAbsorbed heat Qs and heat transferred from furnace shell to air Q Shell and shell Estimating the thickness L of the carbon brick in the target area, which specifically comprises the following steps:
calculating a convection heat exchange coefficient alpha of cooling water in a cooling water pipe;
based on the convective heat transfer coefficient alpha, the heat quantity qos absorbed by the cooling water per second in the target area, and the average temperature t of the cooling water in the cooling water pipe Water and its preparation method Calculating to obtain the temperature t of the inner wall of the cooling water pipe in the target area In-pipe ；
According to the temperature t of the inner wall of the cooling water pipe in the target area In-pipe Calculating the temperature t of the outer wall of the cooling water pipe Outside of the tube ；
Based on the heat quantity Qs absorbed by cooling water per second in the target area and the heat quantity Q transferred from the furnace shell to the air Shell and shell Calculating the total heat flow intensity q of the target area Total (S) ；
Based on the heat quantity Qs absorbed by cooling water in the target area per second and the heat quantity Q transferred from the furnace shell to the air Shell and shell And cooling water pipe outer wall temperature t Outside of the tube Calculating the temperature T of the hot surface of the cooling wall where the cooling water pipe is positioned in the target area Heat of the body ；
Based on the total heat flow intensity q of the target area Total (S) And the temperature T of the hot face of the cooling wall Heat of the body And estimating to obtain the thickness L of the carbon brick in the target area.
4. A method for estimating a thickness of a carbon brick on a side wall of a hearth of a blast furnace according to claim 3, wherein the estimation formula of the thickness L of the carbon brick in the target area is:
in the formula (9), T 0 Is the erosion isotherm lambda of the dead iron layer in the hearth of the blast furnace Carbon brick Is the thermal conductivity of the carbon brick in the target area.
5. A blast furnace hearth side wall carbon brick thickness estimation method according to claim 3, wherein the targetTemperature t of outer wall of cooling water pipe in region Outside of the tube The calculation formula of (2) is as follows:
in the formula (5), r Outer part For the external diameter of the cooling water pipe r Inner part For cooling water pipe inner diameter l Pipe Is the pipe length lambda of the cooling water pipe in the target area Steel and method for producing same Is the heat conductivity coefficient of the cooling water pipe.
6. A method for estimating a thickness of a side wall carbon brick of a hearth of a blast furnace according to claim 3, wherein the temperature t of an inner wall of a cooling water pipe in the target area In-pipe The calculation formula of (2) is as follows:
in the formula (4), S1 is the area of the cooling water pipe in the target area.
7. The method for estimating the thickness of a carbon brick on a side wall of a hearth of a blast furnace according to claim 3, wherein the temperature T of a hot surface of a cooling wall where a cooling water pipe is located in the target area Heat of the body The calculation formula of (2) is as follows:
in the formula (8), s 1 S is the area of the cooling wall in the target area, lambda is the distance from the cooling tube to the hot surface of the cooling wall in the target area Copper (Cu) Copper is the material of the cooling wall for its thermal conductivity.
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