A system and method for continuously measuring the air permeability of sintering mixture
By setting up a detection unit at the head of the sintering machine, including a blower, a main pipe and a branch pipe, and using a gas pressure measuring instrument to measure the breathability of the sintered mixture online, the problem of the inability to continuously measure in the prior art is solved, and the sintering efficiency and production effect are improved.
Patent Information
- Application Number
- CN202010958337.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-09-14
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2040-09-14
AI Technical Summary
The prior art cannot continuously measure the air permeability of sintered mixtures online, affecting the mass transfer, heat transfer and physical and chemical reactions of the sintering process, resulting in unstable yield and quality.
The head of the sintering machine is equipped with a detection unit, including a blower, a main pipe and a branch pipe. The pressure in the branch pipe is measured through a gas pressure measuring instrument to ensure that the gas flow of the two branch pipes is equal, and the gas flow is controlled through the flow control valve and the control valve. The branch pipe is out of the branch pipe. The air port is tilted and the screen is installed to ensure the accuracy and stability of the measurement.
The online continuous air permeability measurement of the sintered mixture is realized, the sintering efficiency and production effect are improved, and the accuracy and reliability of the measurement results are ensured.
Smart Images
Figure CN111929222B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of metallurgical sintering, and more particularly to a system for continuously measuring the air permeability of a sintering mixture and a measuring method thereof. Background Art
[0002] The sintering process is to mix the sintering batch materials (a mixture of iron ore powder, flux, solid fuel, return ore, etc.) with an appropriate amount of water, mix and granulate them into a mixture, and then spread them on the sintering trolley. Under the suction action of the lower bellows, the solid fuel in the surface mixture is ignited and a high-temperature physical and chemical (sintering) reaction is carried out from top to bottom, so that the mixture is transformed into sintered ore.
[0003] During the sintering process, the flow condition and change law of gas in the sintering mixture layer are related to the mass transfer, heat transfer and physical and chemical reactions of the sintering process, and thus have a great impact on the output, quality and energy consumption of sintered ore. Therefore, the permeability of sintered ore is the most important factor affecting the utilization factor of the sintering machine. The sintering cup test, as the main test method for sintering process research, can only measure the permeability of the original material layer offline, and cannot perform online continuous measurement during the actual sintering production process. Summary of the invention
[0004] 1. Technical problem to be solved by the invention
[0005] The purpose of the present invention is to overcome the problem in the prior art that sintering mixtures cannot be continuously measured online, and to provide a system for continuously measuring the permeability of sintering mixtures and a measurement method thereof; the present invention is provided with a detection unit at the head of a sintering machine, and a gas pressure measuring instrument installed in each branch pipe through the detection unit measures the pressure in the corresponding pipeline, and finally the permeability of the detected mixture is obtained, and the entire system has a simple structure and is easy to operate.
[0006] 2. Technical solution
[0007] In order to achieve the above object, the technical solution provided by the present invention is:
[0008] A system for continuously measuring the air permeability of a sintered mixture of the present invention comprises a ore trough, a distributor and a sintering machine. The head of the sintering machine is provided with a detection unit, which comprises a blower, a main pipe and a branch pipe. One end of the main pipe is connected to the blower, and the other end of the main pipe is connected to two branch pipes, which are arranged in a vertical direction, and one end of the branch pipe is inserted into the mixture. A gas pressure measuring instrument is provided in the branch pipe.
[0009] As a further improvement of the present invention, the gas flow rates in the two branch pipes are equal.
[0010] As a further improvement of the present invention, the height difference between the two branch pipes is H, the height between the branch pipe close to the sintering trolley table and the bottom surface of the material is G, and G≥1.5H.
[0011] As a further improvement of the present invention, a flow control valve is provided at a corresponding position on each of the two branch pipes, and the flow control valve is arranged at an end away from the mixture.
[0012] As a further improvement of the present invention, the gas pressure measuring instrument is arranged between the corresponding flow control valve and the mixture, the distance between the gas pressure measuring instrument and the corresponding flow control valve is greater than 10 times the inner diameter of the branch pipe, and the gas pressure measuring instrument is in the pipeline area outside the material surface line.
[0013] As a further improvement of the present invention, the air outlet of the branch pipe is arranged tilted, and its tilting direction is toward the table surface of the knotting trolley, and the tilting angle is α, α≤35°.
[0014] As a further improvement of the present invention, a screen is installed at the air outlet of the branch pipe.
[0015] As a further improvement of the present invention, the two branch pipes are located in the middle of the sintering trolley.
[0016] As a further improvement of the present invention, a control valve is provided on the main pipe.
[0017] A method for measuring the air permeability of a sintering mixture continuously, using the above-mentioned system for measuring the air permeability of a sintering mixture continuously, wherein the process is as follows: a distributor distributes the mixture from the ore trough on the sintering trolley, blows air into the main pipe through a blower, and then the air enters the two branch pipes, and the flow rate flowing into the branch pipes is controlled by the corresponding flow control valve, so that the air flow rate in the two branch pipes is equal, that is, Q = Q1 = Q2, unit: m 3 / min; then the pressure in the corresponding branch pipe is measured by a gas pressure measuring instrument to obtain the pressure drop △p of the material layer, unit: Pa, △p=|p1-p2|; finally, the permeability P of the sintering mixture is obtained,
[0018]
[0019] Where, A: cross-sectional area of branch pipe, m 2 ;
[0020] H: The distance between two branches, m.
[0021] 3. Beneficial effects
[0022] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:
[0023] (1) A system for continuously measuring the air permeability of a sintering mixture of the present invention comprises a detection unit at the head of a sintering machine, air is introduced into the main pipe and the branch pipe by a blower, and the front end of the branch pipe is inserted into the mixture, and a gas pressure measuring instrument installed in each branch pipe by the detection unit measures the pressure in the corresponding pipe, and finally obtains the air permeability of the detected mixture. The whole system has a simple structure, is easy to operate, and can continuously detect the air permeability of the mixture;
[0024] (2) A system for continuously measuring the permeability of a sintered mixture of the present invention can effectively ensure the accuracy of subsequent permeability test results by controlling the gas flow rates in the two branch pipes to make the gas flow rates of the two branch pipes equal; in addition, by controlling the heights of the two branch pipes and the bottom surface of the material, the gas flowing out of the branch pipes will not flow downward to affect the accuracy of the measurement;
[0025] (3) A system for continuously measuring the permeability of a sintered mixture of the present invention controls the gas flow rate flowing into the corresponding pipeline by providing flow control valves on the two branch pipes and a control valve on the main pipe, thereby effectively controlling the gas flow rate flowing out of the outlet of the branch pipe, avoiding blowing away the mixture at the outlet and affecting the permeability detection, thereby ensuring the accuracy of the detection result;
[0026] (4) The system for continuously measuring the air permeability of sintered mixtures of the present invention controls the tilt angle and the size of the tilt angle so that when the mixture is piled on the table, it will not affect the gas outlet of the branch pipe, thereby minimizing the impact on the test results and improving the accuracy of the test results; at the same time, since the gas outlet of the branch pipe is inclined, the gas will not affect the mixture at the gas outlet during the outflow process, that is, the airflow will not blow away the mixture at the gas outlet and affect the permeability test;
[0027] (5) In a system for continuously measuring the air permeability of a sintered mixture of the present invention, a screen is installed at the gas outlet of each branch pipe, and the screen is used to block the mixture to prevent the mixture from entering the branch pipe and affecting the detection;
[0028] (6) The present invention provides a method for continuously measuring the permeability of a sintered mixture. The method uses the above-mentioned system for continuously measuring the permeability of a sintered mixture to perform online measurement of the mixture. The entire measurement process is simple and convenient, and can improve the sintering efficiency and production effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] Figure 1 It is a structural schematic diagram of a system for continuously measuring the air permeability of sintering mixtures according to the present invention;
[0030] Figure 2 for Figure 1 Schematic diagram of the top view structure.
[0031] Explanation of the symbols in the schematic diagram:
[0032] 10. Ore chute; 11. Feeder; 20. Distributor; 30. Mixing material; 40. Star wheel; 41. Material plate; 42. Fan; 43. Ignition furnace; 44. Guardrail; 51. Blower; 52. Main pipe; 521. Control valve; 53. Branch pipe; 531. Gas pressure measuring instrument. DETAILED DESCRIPTION
[0033] In order to further understand the content of the present invention, the present invention is described in detail in conjunction with the accompanying drawings and embodiments.
[0034] Example 1
[0035] The present embodiment provides a system for continuously measuring the air permeability of a sintering mixture, comprising a ore trough 10, a distributor 20 and a sintering machine, wherein the sintering machine comprises a sintering trolley, a material plate 41, a fan 42, an ignition furnace 43 and a fence 44, Figure 1 and Figure 2 The ore trough 10 is used to store the mixture 30, and the mixture 30 is sent to the distributor 20 through the feeder 11 at the lower part of the ore trough 10. The mixture 30 is evenly transported to the sintering trolley by the distributor 20. Under the action of the whole material plate 41, the high uniformity of the mixture 30 is ensured.
[0036] It is worth noting that the distributor 20 of this embodiment adopts a nine-roller distributor, which is set at an angle, and under the action of the sintering trolley star wheel 40, the mixed material 30 is evenly distributed on the table surface of the trolley, and then the mixed material 30 is sintered under the action of the fan 42 and the ignition furnace 43.
[0037] For the mixture 30, its permeability is the most important factor affecting the utilization coefficient of the sintering machine. By measuring the permeability of the mixture, it is possible to determine whether the moisture content of the mixture, the ratio of quicklime, the comprehensive properties of the mixture 30, etc. have changed. At the same time, it can provide a basis for implementing pre-feedback control for the sintering endpoint control and improve the control effect of the sintering endpoint control.
[0038] In order to facilitate the online continuous measurement of the air permeability of the mixture 30 in the actual production process, the present embodiment provides a detection unit at the head of the sintering machine, and the detection unit includes a blower 51, a main pipe 52 and a branch pipe 53, wherein one end of the main pipe 52 is connected to the blower 51, and the other end of the main pipe 52 is connected to two branch pipes 53, and the two branch pipes 53 are arranged in a vertical direction, that is, the two branch pipes 53 are arranged in a direction perpendicular to the table surface of the sintering trolley, and one end of the branch pipe 53 is inserted into the mixture 30, and a gas pressure measuring instrument 531 is provided in the branch pipe 53, and the pressure in the corresponding branch pipe 53 is measured by the gas pressure measuring instrument 531, so as to calculate the air permeability of the mixture 30, and the whole system has a simple structure and is easy to operate.
[0039] It is worth noting that, in this embodiment, a control valve 521 is provided on the main pipe 52, and the amount of air blown by the blower 51 is controlled by the control valve 521. In addition, flow control valves are provided at corresponding positions on the two branch pipes 53, and the flow control valves are arranged at one end away from the mixture 30. During the detection process, the gas flow in the two branch pipes 53 is controlled. For example, the gas flow of one branch pipe 53 is Q1, and the gas flow of the other branch pipe 53 is Q2. The gas flow of the two branch pipes is controlled to be equal, that is, Q = Q1 = Q2, unit: m 3 / min.
[0040] In this embodiment, the gas flow rate is controlled by the control valve 521 and the flow control valves on each branch pipe 53, so that the accuracy of the subsequent pressure measurement of each branch pipe 53 can be ensured. If the branch pipes 53 are not controlled, since the branch pipes 53 are inserted into the mixed material 30 and the positions in the mixed material 30 are different, the pressures received by the two branch pipes 53 are also different, resulting in different gas flow rates flowing into the two branch pipes 53, thereby affecting the final permeability test result.
[0041] Furthermore, in this embodiment, the height difference between the two branch pipes 53 is H, the height between the branch pipe 53 close to the sintering trolley table and the bottom of the material is G, and G≥1.5H, which can be G=1.6H, G=1.75H, G=1.8H or G=2H……
[0042] Preferably, in this embodiment, G=1.8H.
[0043] In order to further ensure the accuracy of the test results, the gas pressure measuring instrument 531 located in each branch pipe 53 is arranged between the corresponding flow control valve and the mixed material 30, and the distance between the gas pressure measuring instrument 531 and the corresponding flow control valve is greater than 10 times the inner diameter of the branch pipe 53, and the gas pressure measuring instrument 531 is in the pipeline area outside the material surface line.
[0044] This embodiment controls the position of the gas pressure measuring instrument 531 so that the airflow at the position where the gas pressure measuring instrument 531 is located is more stable and the detected result is more accurate, thereby ensuring the accuracy of the final result.
[0045] The measuring method of the system for continuously measuring the air permeability of sintered mixtures in this embodiment adopts the above-mentioned system for continuously measuring the air permeability of sintered mixtures, and the process is as follows: the distributor 20 distributes the mixture 30 from the ore trough 10 on the sintering trolley, blows air into the main pipe 52 through the blower 51, and then the air enters the two branch pipes 53, and the flow rate flowing into the branch pipes 53 is controlled by the corresponding flow control valve, so that the air flow rate in the two branch pipes 53 is equal, that is, Q = Q1 = Q2, unit: m 3 / min; then the pressure in the corresponding branch pipe 53 is measured by the gas pressure measuring instrument 531 to obtain the pressure drop △p of the material layer, unit: Pa, △p=|p1-p2|, p1 is the pressure in one of the branch pipes 53, p2 is the pressure in the other branch pipe 53; finally, the permeability P of the sintering mixture 30 is obtained,
[0046]
[0047] Where, A: cross-sectional area of branch pipe, m 2 ;
[0048] H: The distance between two branches, m.
[0049] Through the above process and related calculations, the air permeability P of the mixture 30 can be obtained, and the mixture 30 can be measured online. The entire measurement process is simple and convenient, and can improve the sintering efficiency and the production effect.
[0050] Example 2
[0051] The system for continuously measuring the air permeability of sintering mixture in this embodiment is basically the same as that in embodiment 1. Furthermore, in this embodiment, the outlet of the branch pipe 53 is inclined, and its inclination direction is toward the table of the sintering trolley. Figure 1 As shown, the inclination angle is α, and 0<3α≤35°, which can be 10°, 15°, 20°...25° or 35°.
[0052] Preferably, the inclination angle α is 35°.
[0053] Since the mixture 30 is distributed to the table of the sintering trolley by the distributor 20, the mixture falls from the top to the table, and one end of the branch pipe 53 is inserted into the mixture 30. This embodiment controls the inclination angle and the size of the inclination angle so that when the mixture 30 is piled up on the table, it will not affect the air outlet of the branch pipe 53, thereby minimizing the impact on the detection result and improving the accuracy of the detection result; at the same time, since the air outlet of the branch pipe 53 is inclined, the gas will not affect the mixture 30 at the air outlet during the outflow process, that is, the airflow will not blow away the mixture 30 at the air outlet, thereby affecting the permeability detection.
[0054] For the airflow flowing out of the air outlet, it first contacts the mixture 30 below the branch pipe 53, and then contacts the mixture 30 from other directions. Therefore, the airflow will first flow out from the bottom of the branch pipe 53, so it has less effect on the looseness of the mixture 30, thereby improving the accuracy of the detection result.
[0055] It is worth noting that due to the different raw materials used for sintering and the different stacking thicknesses of the mixed material 30 on the sintering trolley, the air flow in the main pipe 52 and the branch pipe 53 can be changed according to the actual production and processing conditions, but it is necessary to ensure that the airflow blown out by the branch pipe 53 will not disperse the mixed material 30.
[0056] In addition, a screen is installed at the air outlet of each branch pipe 53 to block the mixed material 30 to prevent the mixed material 30 from entering the branch pipe 53 and affecting the detection.
[0057] Preferably, the hole spacing of the screen in this embodiment is 3 mm.
[0058] like Figure 2 As shown, the two branch pipes 53 of this embodiment are located in the middle of the sintering trolley, so that the branch pipes 53 are far away from the sintering trolley guardrail 44, thereby ensuring that the test results are representative and can reflect the air permeability of the entire mixture 30.
[0059] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.
Claims
1. A system for continuously measuring the air permeability of a sintering mixture, comprising a ore trough (10), a distributor (20) and a sintering machine, characterized in that: The head of the sintering machine is provided with a detection unit, which includes a blower (51), a main pipe (52) and a branch pipe (53). One end of the main pipe (52) is connected to the blower (51), and the other end of the main pipe (52) is connected to two branch pipes (53). The two branch pipes (53) are arranged in a vertical direction, and one end of the branch pipe (53) is inserted into the mixed material (30). A gas pressure measuring instrument (531) is provided in each of the two branch pipes (53); a control valve (521) is provided on the main pipe (52), and the two branch pipes (53) are located in the middle of the sintering trolley.
2. A system for continuously measuring the air permeability of sintering mixture according to claim 1, characterized in that: The gas flow rates in the two branch pipes (53) are equal.
3. A system for continuously measuring the permeability of sintering mixture according to claim 2, characterized in that: The height difference between the two branch pipes (53) is H, and the height between the branch pipe (53) close to the sintering trolley table and the bottom surface of the material is G, and G≥1.5H.
4. A system for continuously measuring the permeability of sintering mixture according to claim 3, characterized in that: A flow control valve is provided at a corresponding position on each of the two branch pipes (53), and the flow control valve is arranged at an end away from the mixed material (30).
5. A system for continuously measuring the permeability of sintering mixture according to claim 4, characterized in that: The gas pressure measuring instrument (531) is arranged between the corresponding flow control valve and the mixed material (30), the distance between the gas pressure measuring instrument (531) and the corresponding flow control valve is greater than 10 times the inner diameter of the branch pipe (53), and the gas pressure measuring instrument (531) is in the pipeline area outside the material surface line.
6. A system for continuously measuring the permeability of sintered mixture according to any one of claims 2 to 5, characterized in that: The air outlet of the branch pipe (53) is arranged tilted, with its tilting direction facing the table surface of the trolley, and the tilting angle is α, α≤35°.
7. A system for continuously measuring the air permeability of sintering mixture according to claim 6, characterized in that: The air outlet of the branch pipe (53) is equipped with a screen.
8. A method for continuously measuring the permeability of a sintering mixture system, characterized in that: The system for continuously measuring the air permeability of sintering mixtures as described in claim 7 is used, and the process is as follows: the distributor (20) distributes the mixture from the ore trough (10) on the sintering trolley, and the air is blown into the main pipe (52) by the blower (51), and then the air enters the two branch pipes (53), and the flow rate flowing into the branch pipes (53) is controlled by the corresponding flow control valves so that the air flow rates in the two branch pipes (53) are equal, that is, Q = Q1 = Q2, unit: m 3 / min; then the pressure in the corresponding branch pipe (53) is measured by a gas pressure measuring instrument (531) to obtain the pressure drop △p of the material layer, in units of Pa, where △p=|p1-p2|; finally, the permeability P of the sintering mixture (30) is obtained, Where, A: cross-sectional area of branch pipe, m 2 ; H: The distance between two branches, m.