CN117625864A - Method for automatically detecting water leakage of blast furnace - Google Patents
Method for automatically detecting water leakage of blast furnace Download PDFInfo
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- CN117625864A CN117625864A CN202311406297.7A CN202311406297A CN117625864A CN 117625864 A CN117625864 A CN 117625864A CN 202311406297 A CN202311406297 A CN 202311406297A CN 117625864 A CN117625864 A CN 117625864A
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- blast furnace
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- hydrogen
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 64
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000001257 hydrogen Substances 0.000 claims abstract description 58
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 58
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 14
- 210000001015 abdomen Anatomy 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims description 25
- 239000003245 coal Substances 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 13
- 239000001301 oxygen Substances 0.000 claims description 13
- 229910052760 oxygen Inorganic materials 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- -1 blast humidity Substances 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
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- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a method for automatically detecting water leakage of a blast furnace, which comprises the following steps: collecting and storing blast furnace data; periodically calculating and storing the furnace top gas quantity, the content of hydrogen in the furnace belly gas and the hydrogen utilization rate according to the blast furnace data; comparing the average value of the hydrogen utilization rates of a plurality of recent statistical periods, and judging whether the hydrogen content in the top gas is increased or not; comparing the average value of the ratio CC2 of the carbon monoxide content and the carbon dioxide content in the top gas in a plurality of most recent statistical periods, and judging whether the blast furnace has pipeline leakage or not; if the blast furnace does not leak, and the content of the hydrogen in the top gas is calculated to be increased, a blast furnace operator is reminded that the blast furnace possibly has water leakage.
Description
Technical Field
The invention belongs to the technical field of blast furnace ironmaking, and particularly relates to a method for automatically detecting water leakage of a blast furnace.
Background
The temperature is high and the service environment is bad in the production process of the blast furnace, so that cooling water pipes are required to be arranged at the positions of the furnace body, the furnace waist, the furnace abdomen, the furnace hearth and the like to cool the blast furnace in the production process of the blast furnace. However, the complex production environment of the blast furnace can also corrode the cooling equipment, which is not only required to withstand high temperatures, but also subjected to mechanical wear of the burden and scouring of the high-velocity gas stream. In general, the cooling water pipe is damaged and leaked after a certain period of production, and the cooling water pipe is easily ignored by blast furnace operators in the early stage of water leakage. The gas flow is disturbed, the furnace temperature is greatly fluctuated and the fuel ratio is increased due to the light water leakage of the blast furnace; the serious accident can be caused by furnace cooling, furnace hearth freezing and the like. Therefore, the water leakage or damage of the cooling wall is discovered early, and the blast furnace operator is reminded to take corresponding measures, so that the normal smelting of the blast furnace and the service life of the blast furnace are directly influenced.
Disclosure of Invention
In order to solve the technical problems, the invention provides an automatic method for detecting water leakage of a blast furnace, which can utilize the changes of blast furnace air quantity, oxygen enrichment and top gas components, and synthesize the changes of the furnace condition and hydrogen utilization rate of the blast furnace to help a blast furnace operator to judge whether the cooling wall water leakage exists in the blast furnace in time.
The technical proposal is as follows:
a method for automatically detecting water leakage of a blast furnace, comprising the following steps:
collecting and storing blast furnace data;
periodically calculating and storing the furnace top gas quantity, the content of hydrogen in the furnace belly gas and the hydrogen utilization rate according to the blast furnace data;
comparing the average value of the hydrogen utilization rates of a plurality of recent statistical periods, and judging whether the hydrogen content in the top gas is increased or not;
comparing the average value of the ratio CC2 of the carbon monoxide content and the carbon dioxide content in the top gas in a plurality of most recent statistical periods, and judging whether the blast furnace has pipeline leakage or not;
if the blast furnace does not leak, and H in the top gas is calculated 2 If the volume fraction of the blast furnace is increased, the operator of the blast furnace is reminded that the blast furnace possibly has water leakage.
Further, the blast furnace data includes: the method comprises the steps of oxygen-containing air quantity of a blast furnace, oxygen-enriched quantity of the blast furnace, hydrogen content in top gas, nitrogen content in top gas, coal powder carrying quantity, coal powder injection quantity, hydrogen content of coal powder, blast humidity, carbon dioxide content in top gas and carbon monoxide content in top gas.
Further, the method comprises the steps of,
the calculation formula of the furnace top gas quantity is as follows:
VTOP＝[(BV5M-k1*BVO)*k2+BVINJ*k3]/N2
the calculation formula of the content of hydrogen in the furnace belly gas is as follows:
VBSH2＝[k4*WINJ*INJH+k5*BV5M*MOI]*k6
the calculation formula of the hydrogen utilization rate is as follows:
ETAH2＝k7*[VBSH2-(k8*VTOP*H2)]/VBSH2
wherein BV5M is oxygen-containing air quantity; BVO is oxygen enrichment; h2 is the hydrogen content in the top gas; n2 is the nitrogen content in the top gas; BVINJ is the coal powder air-carrying capacity; WINJ is pulverized coal injection quantity; INJH is the hydrogen content of coal powder; and k1 to k8 are coefficients.
Further, the average value of the hydrogen utilization rate in a plurality of most recent statistical periods is taken for comparison, and the method for judging whether the hydrogen content in the top gas is increased is as follows:
setting a statistical period, and calculating and storing an average value of hydrogen utilization rate in each statistical period;
taking the average value of the hydrogen utilization rate of the last three statistical periods, recording the average value as ETAH2 (k), ETAH2 (k-1) and ETAH2 (k-2), and outputting the calculation results of the ETAH2 (k) -ETAH2 (k-1) and the ETAH2 (k) -ETAH2 (k-2);
comparing the two calculations with a set first threshold, and if one of the two calculations is less than the first threshold, then the hydrogen content in the top gas is considered to be increased.
Further, the average value of the ratio CC2 of the carbon monoxide content and the carbon dioxide content in the top gas in the most recent statistical periods is compared, and the method for judging whether the blast furnace has pipeline leakage is as follows:
setting a statistical period, calculating and storing an average value of the ratio of the carbon monoxide content to the carbon dioxide content in the top gas in each statistical period, and recording the average value as CC2;
taking the average value of the CC2 of the last three statistical periods, marking the average value as CC2 (k), CC2 (k-1) and CC2 (k-2), and outputting the calculation results of the CC2 (k) -CC2 (k-1) and the CC2 (k) -CC2 (k-1);
comparing the two calculation results with a set second threshold value, and if both calculation results are smaller than the second threshold value, considering that the blast furnace does not have pipeline leakage.
Further, the method further comprises the step of taking a water supplementing curve of the expansion tank at the top of the furnace, taking slope data of a plurality of last statistical periods, and considering that the possibility of water leakage exists in the blast furnace if the change value of the slope is larger than a set third threshold value.
The automatic water leakage method for the blast furnace can periodically extract the ratio of the hydrogen utilization rate to the carbon monoxide content and the carbon dioxide content in the top gas from the blast furnace data, and help a blast furnace operator to judge whether the cooling wall water leakage condition exists in the blast furnace according to the change rule of the hydrogen utilization rate and the carbon monoxide content and the carbon dioxide content.
Drawings
FIG. 1 is a flow chart of a method of automatically detecting water leakage in a blast furnace according to the present invention.
Detailed Description
For further illustration of the various embodiments, the invention is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible embodiments and advantages of the present invention. The components in the figures are not drawn to scale and like reference numerals are generally used to designate like components.
The invention will now be further described with reference to the drawings and detailed description.
Example 1
As shown in fig. 1, the embodiment provides a method for automatically detecting water leakage of a blast furnace, which comprises the following steps:
step S1: and collecting and storing blast furnace data.
The blast furnace data includes: oxygen-containing air quantity of the blast furnace, oxygen-enriched quantity of the blast furnace, hydrogen content in top gas, nitrogen content in top gas, coal powder carrying quantity, coal powder injection quantity, hydrogen content of coal powder, blast humidity, carbon dioxide content in top gas, carbon monoxide content in top gas and the like. The hydrogen content in the top gas represents the volume fraction of hydrogen in the top gas, the remainder being the same.
All data are collected and stored by the data collection system of the blast furnace, in this embodiment, the collected data are collected in five minutes as a sampling period, and the average value of five minutes is calculated, and then stored for later analysis and further calculation.
Step S2: and periodically calculating the furnace top gas quantity, the content of hydrogen in the furnace belly gas and the hydrogen utilization rate according to the blast furnace data.
In the concrete operation, according to the sampling data of each time point, calculating the data such as the furnace top gas quantity, the content of hydrogen in the furnace belly gas, the hydrogen utilization rate and the like.
The calculation formula of the furnace top gas quantity is as follows:
VTOP＝[(BV5M-BVO/60)*79+BVINJ*100]/N2
the formula can be expressed as:
VTOP＝[(BV5M-k1*BVO)*k2+BVINJ*k3]/N2
the calculation formula of the hydrogen content in the furnace gas is as follows:
VBSH2＝[WINJ*(1000/60)*INJH/1000+BV5M*MOI*0.001
*(2/18)]*11.2
the formula can be expressed as:
VBSH2＝[k4*WINJ*INJH+k5*BV5M*MOI]*k6
the calculation formula of the hydrogen utilization rate is as follows:
ETAH2＝[VBSH2-(VTOP*60*H2/100)]/VBSH2*100
the formula can be expressed as:
ETAH2＝k7*[VBSH2-(k8*VTOP*H2)]/VBSH2
wherein BV5M is oxygen-containing air quantity; BVO is oxygen enrichment; h2 is the hydrogen content in the top gas; n2 is the nitrogen content in the top gas; BVINJ is the coal powder air-carrying capacity; WINJ is pulverized coal injection quantity; INJH is the hydrogen content of coal powder; k1 to k8 are constants set or obtained from empirical data.
All the data above were calculated once for 5 minutes and then stored.
Step 3: and comparing the average value of the hydrogen utilization rates of the most recent statistical periods to judge whether the hydrogen content in the top gas is increased.
In a specific operation, the average of the last three times of hydrogen utilization is first calculated and recorded as the ETAH215, i.e., the average of 15 minutes of hydrogen utilization, and then stored. In a specific operation, the statistical period may be adjusted as desired, such as 20 minutes, 30 minutes, etc.
The last three ETAHs 215 were taken and denoted ETAH215 (k), ETAH215 (k-1) and ETAH215 (k-2).
Comparing the relationship of ETAH215 (k) -ETAH215 (k-1) or ETAH215 (k) -ETAH215 (k-2) to the set threshold value 1, if either is less than threshold value 1, the hydrogen content in the top gas is considered to be increased. The threshold 1 is defined by parameters based on empirical data, and the specific value of the threshold 1 is not limited herein.
In particular operations, it is also necessary to exclude variations in the hydrogen content due to the pipe travel.
Step S4: and comparing the average value of the ratio CC2 of the carbon monoxide content and the carbon dioxide content in the top gas in the most recent statistical periods, and judging whether the blast furnace has pipeline leakage or not.
CO: carbon monoxide content in top gas, CO2: carbon dioxide content in the top gas; cc2=co/CO 2.
The calculation period of CC2 was 5 minutes.
In a specific operation, the average of the last three CC 2's is first calculated as CC215, i.e. CO and CO in the top gas 2 The average value of the ratio of the contents for 15 minutes is then stored.
The last three times of CC215 are denoted as CC215 (k), CC215 (k-1) and CC215 (k-2), respectively.
Comparing the calculation results of CC215 (k) -CC215 (k-1) and CC215 (k-1) -CC215 (k-2) with a set threshold value 2, and when both calculation results are smaller than threshold value 2, it is considered that no pipeline leakage has occurred in the blast furnace. As above, the threshold 2 is defined by parameters based on empirical data, and the specific value of the threshold 2 is not limited herein.
Steps S3 and S4 are not sequential.
Step S5: if the blast furnace does not leak, and the content of the hydrogen in the top gas is calculated to be increased, reminding a blast furnace operator that the blast furnace possibly has water leakage; at this time, a plumber needs to confirm a specific leakage point on site and take corresponding measures for dealing with the leakage point.
In order to further judge the water leakage condition of the blast furnace, the following means can be further adopted:
step S6: taking the water replenishing curve of the expansion tank at the top of the furnace, taking the latest slope data, and if the change value delta mu of the slope is larger than the set threshold value 3, indicating that water replenishing is suddenly fast, and the possibility of water leakage exists. As above, the threshold 3 is defined by parameters based on empirical data, and the specific value of the threshold 2 is not limited here.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A method for automatically detecting water leakage of a blast furnace, comprising the steps of:
collecting and storing blast furnace data;
periodically calculating and storing the furnace top gas quantity, the content of hydrogen in the furnace belly gas and the hydrogen utilization rate according to the blast furnace data;
comparing the average value of the hydrogen utilization rates of a plurality of recent statistical periods, and judging whether the hydrogen content in the top gas is increased or not;
comparing the average value of the ratio CC2 of the carbon monoxide content and the carbon dioxide content in the top gas in a plurality of most recent statistical periods, and judging whether the blast furnace has pipeline leakage or not;
if the blast furnace does not leak, and the content of the hydrogen in the top gas is calculated to be increased, a blast furnace operator is reminded that the blast furnace possibly has water leakage.
2. The method for automatically detecting water leakage in a blast furnace according to claim 1, wherein: the blast furnace data includes: the method comprises the steps of oxygen-containing air quantity of a blast furnace, oxygen-enriched quantity of the blast furnace, hydrogen content in top gas, nitrogen content in top gas, coal powder carrying quantity, coal powder injection quantity, hydrogen content of coal powder, blast humidity, carbon dioxide content in top gas and carbon monoxide content in top gas.
3. The method for automatically detecting water leakage in a blast furnace according to claim 2, wherein:
the calculation formula of the furnace top gas quantity is as follows:
VTOP＝[(BV5M-k1*BVO)*k2+BVINJ*k3]/N2
the calculation formula of the content of hydrogen in the furnace belly gas is as follows:
VBSH2＝[k4*WINJ*INJH+k5*BV5M*MOI]*k6
the calculation formula of the hydrogen utilization rate is as follows:
ETAH2＝k7*[VBSH2-(k8*VTOP*H2)]/VBSH2
wherein BV5M is oxygen-containing air quantity; BVO is oxygen enrichment; h2 is the hydrogen content in the top gas; n2 is the nitrogen content in the top gas; BVINJ is the coal powder air-carrying capacity; WINJ is pulverized coal injection quantity; INJH is the hydrogen content of coal powder; and k1 to k8 are coefficients.
4. The method for automatically detecting water leakage in a blast furnace according to claim 1, wherein: the average value of the hydrogen utilization rate of a plurality of recent statistical periods is taken for comparison, and the method for judging whether the hydrogen content in the top gas is increased is as follows:
setting a statistical period, and calculating and storing an average value of hydrogen utilization rate in each statistical period;
taking the average value of the hydrogen utilization rate of the last three statistical periods, recording the average value as ETAH2 (k), ETAH2 (k-1) and ETAH2 (k-2), and outputting the calculation results of the ETAH2 (k) -ETAH2 (k-1) and the ETAH2 (k) -ETAH2 (k-2);
comparing the two calculations with a set first threshold, and if one of the two calculations is less than the first threshold, then the hydrogen content in the top gas is considered to be increased.
5. The method for automatically detecting water leakage in a blast furnace according to claim 1, wherein: the average value of the ratio CC2 of the carbon monoxide content and the carbon dioxide content in the top gas in the most recent multiple statistical periods is taken for comparison, and the method for judging whether the blast furnace has pipeline leakage or not comprises the following steps:
setting a statistical period, calculating and storing an average value of the ratio of the carbon monoxide content to the carbon dioxide content in the top gas in each statistical period, and recording the average value as CC2;
taking the average value of the CC2 of the last three statistical periods, marking the average value as CC2 (k), CC2 (k-1) and CC2 (k-2), and outputting the calculation results of the CC2 (k) -CC2 (k-1) and the CC2 (k) -CC2 (k-1);
comparing the two calculation results with a set second threshold value, and if both calculation results are smaller than the second threshold value, considering that the blast furnace does not have pipeline leakage.
6. The method for automatically detecting water leakage in a blast furnace according to claim 1, wherein: the method further comprises the step of taking a water supplementing curve of the expansion tank at the top of the furnace, taking slope data of a plurality of most recent statistical periods, and if the change value of the slope is larger than a set third threshold value, considering that the possibility of water leakage exists in the blast furnace.
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| CN202311406297.7A CN117625864A (en) | 2023-10-26 | 2023-10-26 | Method for automatically detecting water leakage of blast furnace |
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