CN115325843A - Method and system for measuring air quantity of sintering charge level - Google Patents
Method and system for measuring air quantity of sintering charge level Download PDFInfo
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- CN115325843A CN115325843A CN202210829064.7A CN202210829064A CN115325843A CN 115325843 A CN115325843 A CN 115325843A CN 202210829064 A CN202210829064 A CN 202210829064A CN 115325843 A CN115325843 A CN 115325843A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 238000001514 detection method Methods 0.000 claims abstract description 13
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- 239000000463 material Substances 0.000 claims description 13
- 238000005259 measurement Methods 0.000 claims description 11
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- 239000000243 solution Substances 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 description 1
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
- F27D2021/0007—Monitoring the pressure
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Abstract
The invention discloses a method and a system for measuring sintering charge level air quantity, wherein the system comprises a pressure detection device and a terminal device, the pressure detection device comprises a pressure gauge and a diversion air pipe arranged on a sintering charge level, the pressure gauge is connected to the diversion air pipe and used for measuring pressure data on the surface of the diversion air pipe when the diversion air pipe arranged on the sintering charge level runs along with a sintering trolley, and the terminal device is connected with the pressure gauge, and the method comprises the following steps: acquiring pressure data acquired by a pressure gauge; determining the wind speed of the sintering charge level based on the pressure data; and determining the air quantity of the sintering charge level based on the air speed of the sintering charge level. The measuring method can more accurately measure the effective air quantity of the sintering charge level, and effectively solves the problem that the air speed of the sintering charge level is too low to accurately measure.
Description
Technical Field
The invention relates to the technical field of iron ore sintering, in particular to a method and a system for measuring air quantity of a sintering charge surface.
Background
The technologies of reducing the flue gas circulation of the total amount of sintering flue gas, reducing the steam spraying discharged by carbon monoxide and dioxin in the sintering process, reducing the hydrogen-rich fuel injection discharged by carbon in the sintering process and the like become the attention points of the steel industry at present, and the accurate control of the effective air volume of the sintering charge surface is one of the keys of successful implementation of the technologies.
The effective air flow of the sintering charge level refers to the air flow passing through the sintering charge level in the sintering process. The charge level air volume is important basic data for mastering the operation condition of sintering equipment and the state of a sintering process and improving the quality of a sintering ore. Compared with sintering air leakage rate, the charge surface air quantity directly participates in the sintering reaction and is the effective air quantity in the sintering process. The quantity of the partial air volume directly influences various indexes such as quality, yield and solid fuel consumption of the sintered ore.
The existing charge level air quantity testing method is relatively poor in operability and stability, the difference of air permeability of each part of a sintering machine from front to back in the sintering process is large, the air permeability of a material layer is poor due to the existence of an over-wet layer at the front section of the sintering of a sintering charge level, the air speed of the sintering charge level is small, the proportion of loose and hard finished sintering ores at the tail section of the sintering is increased, the air permeability of the material layer is greatly increased, the air speed of the sintering charge level is relatively large, and the difficulty of accurate measurement is further increased. The common charge level air quantity measuring method is to directly place an anemoscope on a sintering charge level, measure the air speed passing through the sintering charge level, and calculate the air quantity of the whole sintering charge level according to the measured value of the air speed, but the accuracy of the air speed measurement is difficult to ensure.
Disclosure of Invention
The embodiment of the application provides the method and the system for measuring the air quantity of the sintering charge level, the method can more accurately measure the effective air quantity of the sintering charge level, and the problem that the air speed of the sintering charge level is too low to accurately measure is effectively solved.
In a first aspect, the present invention provides the following technical solutions through an embodiment of the present invention:
a method for measuring air quantity of a sintering charge level is applied to a system for measuring air quantity of the sintering charge level, the system comprises a pressure detection device and a terminal device, the pressure detection device comprises a pressure gauge and a diversion air pipe arranged on the sintering charge level, the pressure gauge is connected to the diversion air pipe and used for measuring pressure data on the surface of the diversion air pipe when the diversion air pipe runs along with a sintering trolley, and the terminal device is connected with the pressure gauge, wherein the method comprises the following steps: acquiring pressure data acquired by the pressure gauge; determining a wind speed of the sintering charge level based on the pressure data; and determining the air quantity of the sintering charge level based on the air speed of the sintering charge level.
Preferably, the diversion air pipe includes an upper pipe and a lower pipe close to the sintering charge level, the inner diameter of the upper pipe is smaller than that of the lower pipe, the load cell is configured to measure a pressure difference between the upper pipe and the lower pipe when the diversion air pipe runs along with the sintering trolley, and the determining the wind speed of the sintering charge level based on the pressure data includes: and determining the wind speed of the sintering charge level based on the pressure difference.
Preferably, the determining the wind speed of the sintering charge level based on the pressure difference comprises: and determining the wind speed of the sintering charge level based on the calculated wind speed of the sintering charge level, the shape expanded area ratio of the diversion air pipe, the total resistance loss of the diversion air pipe and the ambient air density, wherein the calculated wind speed of the sintering charge level is determined based on the pressure difference, the gravity acceleration and the flow coefficient, and the shape expanded area ratio of the diversion air pipe is determined based on the inner diameter of the upper-section pipe and the inner diameter of the lower-section pipe.
Preferably, the determining the air volume of the sintering charge level based on the air speed of the sintering charge level comprises: and determining the air volume of the sintering charge level based on the air speed of the sintering charge level, the starting time point and the stopping time point of the operation of the diversion air pipe, the machine speed of the sintering trolley and the width of the sintering trolley.
Preferably, before the acquiring the pressure data collected by the load cell, the method further includes: selecting a preset flat area on the surface of the sintered material as a measuring point; and tightly attaching the diversion air pipe to the measuring point.
Preferably, the selecting a preset flat area on the sintering material surface as a measuring point comprises: selecting a plurality of preset flat areas as measuring points in a direction perpendicular to the running direction of the sintering trolley to obtain a plurality of measuring points; and respectively clinging the diversion air pipes to the measuring points.
In a second aspect, the present invention provides the following technical solutions according to an embodiment of the present invention:
a measurement system of sintering charge level air quantity comprises: the pressure detection device comprises a pressure gauge and a diversion air pipe, and the pressure gauge is connected to the diversion air pipe; the flow guide air pipe is arranged on the sintering charge level and runs along with the sintering trolley, and the pressure gauge is used for measuring the pressure data of the surface of the flow guide air pipe when the flow guide air pipe runs along with the sintering trolley; and the terminal equipment is connected with the pressure gauge and used for determining the air volume of the sintering charge level based on the pressure data.
Preferably, the diversion air pipe comprises an upper section pipe and a lower section pipe close to the sintering charge level, the upper section pipe and the lower section pipe are both cylindrical, and the upper section pipe and the lower section pipe are connected through a tapered reducer pipe, so that a cavity communicating structure is formed inside the diversion air pipe; the inner diameter of the upper section pipe is smaller than that of the lower section pipe, and the pressure gauge is used for measuring the pressure difference between the upper section pipe and the lower section pipe in the operation process of the diversion air pipe.
Preferably, the inner diameter of the upper tube is half of the inner diameter of the lower tube, and the height of the upper tube is half of the height of the lower tube.
Preferably, the system further comprises: the flexible base is arranged at the lower end of the diversion air pipe, and the diversion air pipe is tightly attached to the sintering charge level through the flexible bottom.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the method for measuring the air quantity of the sintering charge level, provided by the embodiment of the invention, the diversion air pipe connected with the pressure gauge is placed on the sintering charge level, so that the diversion air pipe runs along with the sintering trolley, the diversion air pipe in running is influenced by air, the surface of the diversion air pipe can bear certain pressure, the pressure data generated on the surface of the diversion air pipe is measured by the pressure gauge, the air speed of the sintering charge level is determined based on the collected pressure data, and the air quantity of the sintering charge level is determined based on the air speed. According to the method, the air quantity of the sintering charge level is determined based on the pressure data, when the air speed of the sintering charge level is unstable, the tiny air speed change on the sintering charge level can be converted into the pressure change, the pressure data is obtained through the pressure measuring instrument, and the air quantity is obtained based on the pressure data through a calculation mode. The measuring and calculating method provided by the invention is simple and effective, can adapt to different sintering production process conditions, and has higher popularization value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method for measuring air quantity of a sintering charge level according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a diversion air duct provided in an embodiment of the present invention.
Detailed Description
The inventor researches and discovers that the traditional method for measuring the airflow speed of the sintering ore burden surface cannot accurately measure the low-speed airflow speed of the sintering burden surface, and a scientific method for calculating the air volume of the sintering burden surface is not provided.
In view of this, the embodiments of the present application provide a method and a system for measuring air volume of a sintering charge level, and the method effectively solves the problem that the air velocity of the sintering charge level is too low to be accurately measured, and can more accurately measure the air volume of the sintering charge level.
The technical scheme of the embodiment of the application has the following general idea:
a method for measuring air quantity of a sintering charge level is applied to a system for measuring air quantity of the sintering charge level, the system comprises a pressure detection device and a terminal device, the pressure detection device comprises a pressure gauge and a diversion air pipe arranged on the sintering charge level, the pressure gauge is connected to the diversion air pipe and used for measuring pressure data on the surface of the diversion air pipe when the diversion air pipe runs along with a sintering trolley, and the terminal device is connected with the pressure gauge, wherein the method comprises the following steps: acquiring pressure data acquired by the pressure gauge; determining a wind speed of the sintering charge level based on the pressure data; and determining the air volume of the sintering charge level based on the air speed of the sintering charge level.
In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.
It should be noted that the terminal device mentioned in the present application may be a PLC (Programmable logic Controller), a single chip microcomputer, or the like.
In a first aspect, the method for measuring sintering charge level air volume provided by the embodiment of the invention is applied to a system for measuring sintering charge level air volume, the system comprises a pressure detection device and a terminal device, the pressure detection device comprises a pressure gauge and a diversion air pipe arranged on a sintering charge level, the pressure gauge is connected to the diversion air pipe and used for measuring pressure data of the surface of the diversion air pipe when the diversion air pipe arranged on the sintering charge level runs along with a sintering trolley, and the terminal device is connected with the pressure gauge.
Specifically, as shown in fig. 1, the method includes the following steps S101 to S103: and S101, acquiring pressure data acquired by the pressure gauge.
In a specific implementation process, before acquiring the pressure data acquired by the load cell, the method may further include: selecting a preset flat area on the surface of a sintering material as a measuring point; the diversion air pipe is tightly attached to the measuring point.
Specifically, the preset flat area may be an area where the sintered charge level is flat and has no cavity crack, and specifically, the preset flat area may be obtained through manual investigation. The diversion air pipe connected with the upper pressure gauge is arranged on the sintering charge level, the lower end of the diversion air pipe is tightly combined with the sintering charge level, and edge air leakage is avoided, so that the influence of uneven sintering charge level and air leakage on the accuracy of pressure measurement is avoided.
Furthermore, in order to enable the combination between the diversion air pipe and the sintering charge level to be tighter, the lower end of the diversion air pipe can be provided with a flexible base, and the diversion air pipe is tightly attached to the sintering charge level through the flexible base, so that the tight attachment is realized. The material of the flexible mount may be rubber, for example.
In a specific embodiment, the diversion air pipe is arranged on the starting point of the sintering charge level, the diversion air pipe and the pressure measuring instrument run on the sintering charge level along with the sintering trolley from the starting point until the ending point, and the pressure measuring instrument continuously records pressure data on the diversion air pipe during the period until the ending point finishes one measurement. Preferably, the load cell may record pressure data every 5 to 10 seconds. And the terminal equipment acquires pressure data acquired by the pressure gauge in real time.
Further, in order to improve the accuracy of pressure data measurement, the selecting a preset flat area on the sintering material surface as a measurement point may further include: selecting a plurality of preset flat areas as measuring points in a direction vertical to the running direction of the sintering trolley to obtain a plurality of measuring points; and respectively clinging the diversion air pipes to the measuring points. Here, a direction perpendicular to the traveling direction of the sintering carriage may be also referred to as a width direction of the sintering carriage.
Specifically, under the condition that the working conditions of the sintering machine are consistent, a plurality of measuring points are determined in the width direction of the sintering trolley, preferably, the measuring points are evenly distributed, a plurality of diversion air pipes with the same specification are respectively attached to the measuring points, one measuring point corresponds to one diversion air pipe, each diversion air pipe is connected with an independent pressure gauge, the diversion air pipes run along with the sintering trolley from an initial point to an end point on the sintering charge level, and a plurality of pressure data are obtained. For example, 5 or more than 5 measurement points of an average distribution may be determined.
And aiming at the pressure data measured by each pressure measuring instrument, determining the wind speed based on the pressure data, calculating the determined component based on the wind speed to obtain the wind volume respectively corresponding to each diversion air pipe, and taking the arithmetic average value of a plurality of wind volumes as the wind volume of the sintering charge level.
And S102, determining the wind speed of the sintering charge level based on the pressure data.
In a specific embodiment, the diversion air pipe includes an upper pipe and a lower pipe close to the sintering charge level, the inner diameter of the upper pipe is smaller than that of the lower pipe, the pressure gauge is used for measuring the pressure difference between the upper pipe and the lower pipe when the diversion air pipe runs along with the sintering trolley, and the wind speed of the sintering charge level is determined based on the pressure data, including: and determining the wind speed of the sintering charge level based on the pressure difference.
Specifically, as shown in fig. 2, the upper tube and the lower tube are both cylindrical and are connected through the tapered reducer pipe, so that a cavity communicating structure is formed inside the diversion air pipe, the inner diameter of the upper tube is smaller than that of the lower tube, and the diversion air pipe is arranged on the sintering charge level and runs along with the sintering trolley. Specifically, the opening direction of the upper section pipe and the lower section pipe of the diversion air pipe can be perpendicular to the sintering charge level, the lower end of the diversion air pipe is tightly attached to the sintering charge level, and the pressure gauge is used for measuring the pressure difference between the upper section pipe and the lower section pipe of the diversion air pipe in the operation process.
Preferably, assuming that the height of the upper tube is h1, the height of the tapered reducer is h2, the height of the lower tube is h3, and the units of h1, h2 and h3 are millimeters, the inner diameter of the upper tube is d1, the central diffusion included angle of the tapered reducer is alpha, and the inner diameter of the lower tube is d2. As an optional embodiment, in order to obtain more effective pressure difference data, the flow guiding duct provided in the present application may have a structural size as follows: the inner diameter of the upper-stage pipe is half of the inner diameter of the lower-stage pipe, namely 2d1= d2, and the height of the upper-stage pipe is half of the height of the lower-stage pipe, namely 2h1= h3. In addition, the height h1 of the upper tube may be ten times the height h2 of the tapered reducer, i.e., h1=10h2, and the central diffusion included angle α of the tapered reducer is 53.2 °. Of course, the diversion duct can also adopt other structural dimensions, such as: 2.5d1= d2,2.5h1= h3, h1=19h2, etc., and the present application is not limited thereto.
Particularly, adopt the design that the internal diameter of upper segment pipe and lower segment pipe is different, the wind speed of upper segment pipe can obtain the improvement of several times according to the square of the diameter ratio of upper segment pipe and lower segment pipe, when wind speed on the sintering charge level changes, the wind speed in the water conservancy diversion tuber pipe changes, the change of wind speed can arouse the pressure variation of upper segment pipe and lower segment pipe in the water conservancy diversion tuber pipe, the internal diameter of upper segment pipe and lower segment pipe is different, can arouse that the pressure variation of upper segment pipe and lower segment pipe is bigger, consequently under the condition of confirming pressure differential, just can realize the measurement to the amount of wind. Alternatively, the pressure gauge mentioned in the present application may be a differential pressure gauge capable of measuring a pressure difference between an upper tube and a lower tube of the ducted air duct.
In order to achieve better measuring effect, a pressure difference measuring hole is formed in the middle area of the side, close to the sintering trolley, of the upper section pipe and the lower section pipe of the diversion air pipe, and a first measuring end and a second measuring end of a pressure difference meter are respectively arranged in the pressure difference measuring hole and used for measuring the pressure difference between the upper section pipe and the lower section pipe of the diversion air pipe. As shown in FIG. 2, positions of a pressure measuring point 1 and a pressure measuring point 2 are shown, the pressure measuring point 1 is located at 1/2 of an upper section of a diversion air pipe, and the pressure measuring point 2 is located at 1/2 of a lower section of the diversion air pipe. Specifically, the measurement range of the differential pressure gauge can be selected to be-2 k to +2kPa with a measurement accuracy of ± 0.05.
As another optional embodiment, the load cell that this application mentioned can include first load cell and second load cell, and first load cell sets up at upper segment pipe for measure the pressure of upper segment pipe, and the second load cell sets up at lower segment pipe for measure the pressure of lower segment pipe, and wherein, first load cell and second load cell all are connected with terminal equipment, and terminal equipment can acquire the pressure value that first load cell and second load cell gathered to the calculation obtains the pressure differential.
In a particular embodiment, determining the wind speed of the sintered charge level based on the pressure differential may include: and determining the wind speed of the sintering charge level based on the calculated wind speed of the sintering charge level, the shape expanded area ratio of the diversion air pipe, the total resistance loss of the diversion air pipe and the ambient air density, wherein the calculated wind speed of the sintering charge level is determined based on pressure difference, gravity acceleration and a flow coefficient, and the shape expanded area ratio of the diversion air pipe is determined based on ambient temperature, ambient atmospheric pressure and a standard atmospheric pressure value. The total resistance loss of the diversion duct represents the total frictional resistance that the diversion duct experiences when operating with the sintering pallet.
Specifically, the inner diameter of the upper pipe is smaller than that of the lower pipe, so that the surface pressure in the upper pipe and the lower pipe changes based on the ratio of the inner diameters, the calculated air speed of the sintering charge level can be calculated through the pressure difference, and the air speed of the sintering charge level is obtained based on the calculated air speed of the sintering charge level.
Specifically, the sintering machine charge level wind speed V 0 Can be calculated according to equation (1):
in the formula:
V 0 -sinter charge level wind speed in meters per second (m/s);
V' 0 -calculating the wind speed in meters per second (m/s) for the sinter level;
n is the shape enlarging area ratio of the variable cross section diversion air pipe;
h ∑ -total resistance loss of the variable cross-section diversion air duct, with unit of pascal (Pa);
rho-ambient air density in kilograms per cubic meter (kg/m) 3 )。
Specifically, the calculated wind speed V 'of the sintered dough' 0 Can be calculated according to equation (2):
in the formula:
mu-flow coefficient, 0.85;
Δ p — pressure difference in pascals (Pa);
g-acceleration of gravity in meters per square second (m/s) 2 )。
n is the shape enlarging area ratio of the variable cross section diversion air pipe;
rho-ambient air density in kilograms per cubic meter (kg/m) 3 )。
Wherein the gravity acceleration g can be 9.8m/s 2.
The shape expansion area ratio n of the diversion air pipe can be determined according to the inner diameter of the lower section pipe and the inner diameter of the upper section pipe. Specifically, the shape expansion area ratio n of the diversion air duct can be calculated according to the formula (3):
the ambient air density ρ may be determined based on the ambient temperature, the ambient atmospheric pressure, and the standard atmospheric pressure value, and specifically may be calculated according to equation (4):
in the formula:
ρ 0 air density 1.293 in kilograms per cubic meter (kg/m) at 0 ℃ under standard atmospheric pressure 3 )；
273.15-conversion constant between kelvin and centigrade temperatures;
101325-one standard atmospheric pressure in pascal (Pa);
t 0 -ambient temperature in degrees centigrade (° c);
p is the ambient atmospheric pressure in pascals (Pa).
Total resistance loss h of diversion air duct ∑ Can be determined based on the frictional resistance loss of the upper segment pipe, the frictional resistance loss of the lower segment pipe and the local resistance loss of the tapered reducer pipe, specifically, the total resistance h above the expansion segment of the diversion air pipe ∑ Calculating according to the formula (5):
h ∑ ＝h f1 +h f2 +h j ......................................................(5)
in the formula:
h f1 -diversion flue pipe h 1 The frictional resistance loss of a segment in pascals (Pa);
h f2 -diversion flue pipe h 3 Loss of frictional resistance of the segmentsThe position is pascal (Pa);
h j diversion air duct h 2 The local resistance loss of a segment is in pascals (Pa).
Further, said h 1 Frictional drag loss h of segment f1 Can be determined based on the absolute roughness, correction coefficient and index correction coefficient of the diversion air duct, specifically, the diversion air duct h 1 Frictional drag loss h of segment f1 Can be calculated according to equation (6):
k is the absolute roughness of the diversion air duct in unit millimeter (mm);
0.11-correction coefficient of empirical formula;
0.25-empirical formula index correction factor;
V' 0 -calculating the wind speed in meters per second (m/s) for the sinter level;
ρ -ambient air density in kilograms per cubic meter (kg/m) 3 )；
n-the shape enlargement area ratio of the diversion air pipe.
The absolute roughness k of the diversion air pipe can be a set value, the calculated air speed of the sintering charge level can be determined according to the formula 2, the ambient air density can be determined according to the formula 4, and the shape expansion area ratio of the diversion air pipe can be determined according to the formula 3.
Further, a diversion air duct h 3 Frictional drag loss h of segment f2 Can be calculated according to equation (7):
k is the absolute roughness of the diversion air duct in unit millimeter (mm);
0.11-correction coefficient of empirical formula;
0.25-empirical formula index correction factor;
V' 0 -calculating the wind speed in meters per second (m/s) for the sinter level;
ρ -ambient air density in kilograms per cubic meter (kg/m) 3 )；
n is the shape enlarging area ratio of the diversion air pipe.
Further, a diversion air duct h 2 Local drag loss h of segment j Can be calculated according to equation (8):
in the formula: xi-local resistance coefficient of the variable cross section diversion air duct;
V' 0 -calculating the wind speed in meters per second (m/s) for the sinter level;
rho-ambient air density in kilograms per cubic meter (kg/m) 3 )；
n-the shape enlargement area ratio of the diversion air pipe.
Further, the local resistance coefficient ξ of the air guide duct can be calculated according to a formula (9):
in the formula:
alpha-the central diffusion angle of the diversion air duct, and the unit is Degree (DEG);
k is the absolute roughness of the diversion air pipe, and the unit is millimeter (mm);
n is the shape of the diversion air pipe to enlarge the area;
8-local resistance coefficient empirical formula correction coefficient of the expansion pipe.
And S103, determining the air volume of the sintering charge level based on the air speed of the sintering charge level.
Specifically, determining the air volume of the sintering charge level based on the air speed of the sintering charge level may specifically include: and determining the air volume of the sintering charge level based on the air speed of the sintering charge level, the running starting time (namely the measuring starting time of the load cell) and the stopping time (namely the measuring stopping time of the load cell), the machine speed of the sintering trolley and the width of the sintering trolley.
Specifically, the sintering charge level air quantity Q can be calculated according to the formula (10):
in the formula:
q-sintering charge surface air quantity, unit is cubic meter per hour (m) 3 /h)；
t 0 -measuring a start time in seconds(s);
t 1 -measuring the end time in seconds(s);
V 0 -wind speed in meters per second (m/s) of the sinter charge level;
V s -the machine speed of the sintering trolley in meters per minute (m/min);
w-the width of the sintering pallet in meters (m).
Briefly, the specific flow of the measuring method for the sintering charge level provided by the application can be as follows:
step 1: selecting 5 or more than 5 evenly distributed measuring points at the front end of the sintering machine along the width direction of the pallet, wherein the measuring points require that the charge level is flat and no cavity crack exists;
step 2: placing a diversion air pipe connected with an upper pressure gauge on the sintering charge level of the initial point, and ensuring that the bottom surface of the lower end of the diversion air pipe is tightly combined with the charge level of the trolley without air leakage;
and step 3: the method comprises the following steps that a diversion air pipe and a pressure tester run along with a sintering trolley from a starting point, and the pressure tester continuously and automatically records the pressure difference between an upper section pipe and a lower section pipe of the diversion air pipe during the operation, so that a plurality of pressure difference data are obtained;
and 4, step 4: and calculating to obtain the sintering charge level wind speed and wind quantity from the starting point to the ending point of each measuring point according to the pressure difference data and the sintering charge level wind speed and wind quantity calculation formula.
And 5: and calculating the arithmetic mean of the wind speeds of the sintering charge surfaces of the measuring points as the wind speed of the sintering charge surface, and calculating the arithmetic mean of the wind amounts of the sintering charge surfaces of the measuring points as the wind amount of the sintering charge surface.
An example of obtaining the sintering charge surface air volume by using the measurement method provided by the application is given as follows:
for example, the measured specification of the sintering machine in this embodiment is 360m 2 And the thickness of the sintering material layer is 800mm. The average wind speed of the sintering machine is 0.84m/s from 10 m to 75 m away from the head of the sintering machine and 5 measuring points, and the wind volume of the sintering material surface of the section measured at this time is 88.4 ten thousand m 3 And h, calculating the air speed in the igniter and the air collecting cover according to the average air speed to obtain the total air quantity of the sintering charge surface of 108.4 ten thousand meters 3 /h。
The specification of the sintering machine measured in the embodiment is 500m 2 The thickness of the sintered layer is 900mm. The average wind speed of the sintering machine is 0.76m/s from 10 m to 85 m away from the head, 5 measuring points, and the wind quantity of the sintering material surface of the section measured at this time is 159.5 ten thousand m through calculation 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. The total air quantity of the sintering charge surface is 195.7 ten thousand meters by calculating the air speed in the igniter and the tail gas-collecting hood according to the average air speed 3 /h。
The measured specification of the sintering machine in this example was 200m 2 The thickness of the sintered layer is 850mm. The average wind speed of the sintering machine from 8 meters to 74 meters away from the head of the sintering machine at 5 measuring points is 0.82m/s, and the air volume of the sintering material surface at the section measured at this time is 62.4 ten thousand m3/h through calculation. The total air volume of the sintering charge level is 76.6 ten thousand m3/h by calculating the air speed in the igniter and the air collecting cover according to the average air speed.
According to the method for measuring the sintering charge level air quantity, the sintering charge level air quantity is measured by utilizing the differential pressure data of the diversion air pipe and combining with the charge level air quantity calculation formula. The measuring method solves the problems that the air speed of the sintering charge level is too low to be accurately measured, the sintering charge level is not flat, air leakage exists to influence the measuring result and the like, and can accurately measure the accurate effective air volume of the sintering charge level.
In summary, according to the method for measuring the air volume of the sintering charge level provided by the embodiment of the invention, the effective air volume of the sintering charge level can be more accurately measured, and the problem that the air velocity of the sintering charge level is too low and cannot be accurately measured is effectively solved.
In a second aspect, based on the same inventive concept, this embodiment provides a system for measuring air volume of a sintering charge level, including: the pressure detection equipment comprises a pressure gauge and a diversion air pipe, and the pressure gauge is connected to the diversion air pipe; the diversion air pipe is tightly attached to the sintering charge level and runs along with the sintering trolley, and the pressure gauge is used for measuring the pressure data of the surface of the diversion air pipe when running along with the sintering trolley; and the terminal equipment is connected with the pressure gauge and used for determining the air volume of the sintering charge level based on the pressure data.
Furthermore, the diversion air pipe comprises an upper section pipe and a lower section pipe, the upper section pipe and the lower section pipe are both cylindrical, and the upper section pipe and the lower section pipe are connected through a tapered reducer pipe, so that a cavity communicating structure is formed inside the diversion air pipe; the inner diameter of the upper section pipe is smaller than that of the lower section pipe, the opening direction of the upper section pipe of the diversion air pipe and the opening direction of the lower section pipe are perpendicular to the sintering charge level, the diversion air pipe is tightly attached to the sintering charge level through the lower section pipe and runs along with the sintering trolley, and the pressure gauge is used for measuring the pressure difference between the upper section pipe and the lower section pipe of the diversion air pipe in the running process.
Further, the inner diameter of the upper-section pipe is half of the inner diameter of the lower-section pipe, and the height of the upper-section pipe is half of the height of the lower-section pipe.
Furthermore, the lower end of the diversion air pipe is provided with a flexible base, and the diversion air pipe is tightly attached to the sintering charge level through the flexible bottom.
The implementation principle and the generated technical effects of the system for measuring the air quantity of the sintering charge surface provided by the embodiment of the invention are the same as those of the method embodiment, and for the sake of brief description, the corresponding contents in the method embodiment can be referred to where the device embodiment is not mentioned.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for measuring the air quantity of a sintering charge level is characterized by being applied to a system for measuring the air quantity of the sintering charge level, the system comprises a pressure detection device and a terminal device, the pressure detection device comprises a pressure gauge and a diversion air pipe arranged on the sintering charge level, the pressure gauge is connected to the diversion air pipe and used for measuring the pressure data of the surface of the diversion air pipe when the diversion air pipe runs along with a sintering trolley, and the terminal device is connected with the pressure gauge, wherein the method comprises the following steps:
acquiring pressure data acquired by the pressure gauge;
determining a wind speed of the sintering charge level based on the pressure data;
and determining the air volume of the sintering charge level based on the air speed of the sintering charge level.
2. The method of claim 1, wherein the induced draft duct comprises an upper section of tubing and a lower section of tubing adjacent to a sintering level, the upper section of tubing having an inner diameter smaller than an inner diameter of the lower section of tubing, the load cell is configured to measure a pressure differential between the upper section of tubing and the lower section of tubing as the sintering pallet is operated, and wherein determining the wind velocity of the sintering level based on the pressure data comprises:
and determining the wind speed of the sintering charge level based on the pressure difference.
3. The method of claim 2, wherein the determining the wind speed of the sintered charge level based on the pressure differential comprises:
and determining the wind speed of the sintering charge level based on the calculated wind speed of the sintering charge level, the shape expansion area ratio of the diversion air pipe, the total resistance loss of the diversion air pipe and the ambient air density, wherein the calculated wind speed of the sintering charge level is determined based on the pressure difference, the gravity acceleration and the flow coefficient, and the shape expansion area ratio of the diversion air pipe is determined based on the inner diameter of the upper section pipe and the inner diameter of the lower section pipe.
4. The method of claim 2, wherein determining the air volume of the sintering charge level based on the air speed of the sintering charge level comprises:
and determining the air volume of the sintering charge level based on the air speed of the sintering charge level, the starting time point and the stopping time point of the operation of the diversion air pipe, the machine speed of the sintering trolley and the width of the sintering trolley.
5. The method of claim 1, wherein prior to acquiring the pressure data collected by the load cell, further comprising:
selecting a preset flat area on the surface of a sintering material as a measuring point;
and tightly attaching the diversion air pipe to the measuring point.
6. The method according to claim 1, wherein the selecting of the preset flat area on the sintering material surface as the measuring point comprises:
selecting a plurality of preset flat areas as measuring points in a direction perpendicular to the running direction of the sintering trolley to obtain a plurality of measuring points;
and respectively clinging the diversion air pipes to the measuring points.
7. The utility model provides a measurement system of sintering charge level amount of wind which characterized in that includes: the pressure detection device comprises a pressure gauge and a diversion air pipe, and the pressure gauge is connected to the diversion air pipe;
the flow guide air pipe is arranged on the sintering charge level and runs along with the sintering trolley, and the pressure gauge is used for measuring the pressure data of the surface of the flow guide air pipe when the flow guide air pipe runs along with the sintering trolley;
and the terminal equipment is connected with the pressure gauge and used for determining the air volume of the sintering charge level based on the pressure data.
8. The system of claim 7, wherein the diversion air duct comprises an upper section pipe and a lower section pipe close to the sintering charge level, the upper section pipe and the lower section pipe are both cylindrical, and the upper section pipe and the lower section pipe are connected through a tapered reducer pipe, so that a cavity communicating structure is formed inside the diversion air duct;
the inner diameter of the upper section pipe is smaller than that of the lower section pipe, and the pressure gauge is used for measuring the pressure difference between the upper section pipe and the lower section pipe in the operation process of the diversion air pipe.
9. The system of claim 8, wherein the inner diameter of the upper section of tubing is half the inner diameter of the lower section of tubing and the height of the upper section of tubing is half the height of the lower section of tubing.
10. The system of claim 7, further comprising: the flexible base is arranged at the lower end of the diversion air pipe, and the diversion air pipe is tightly attached to the sintering charge level through the flexible bottom.
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| CN202210829064.7A CN115325843A (en) | 2022-07-14 | 2022-07-14 | Method and system for measuring air quantity of sintering charge level |
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| CN202210829064.7A CN115325843A (en) | 2022-07-14 | 2022-07-14 | Method and system for measuring air quantity of sintering charge level |
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