Reaction container, device and method for measuring liquid level in container

Abstract

The present invention discloses a reaction container, a device and method for measuring the liquid level height in the container. The measuring device is installed at the center of the top of each chamber of the reaction container. Infrared rays are reflected from the main reflector to the sliding reflector through the probe cover, and then reflected from the sliding reflector to the infrared detector; by adjusting the positions of the main reflector and the sliding reflector, a circular infrared field scanning image of the monitored reaction container is obtained; on this basis, a measurement system operation strategy and an image enhancement segmentation method are further designed to automatically identify the contact line between the slurry and the inner wall of the reaction container, thereby obtaining liquid level information. The present invention can be applied to specific high temperature, high pressure, strong acid and alkali environments to achieve accurate measurement of the liquid level in the container.

Description

Technical Field

[0001] The invention relates to a liquid level measurement technology in a reaction container, in particular to a reaction container, a device and a method for measuring the liquid level height in the container. Background Art

[0002] The hydrometallurgical production of zinc metal has good energy efficiency and little environmental pollution, and is the main method of modern zinc metal production. In the hydrometallurgical zinc smelting technology, the atmospheric pressure oxygen-enriched zinc smelting technology and the oxygen pressure leaching zinc smelting technology can directly acid-leach sphalerite, abandoning the traditional hydrometallurgical zinc roasting process: sulfur is produced in the form of sulfur, the zinc recovery rate is high, the process adaptability is good, and the technical development potential and prospects are excellent. Compared with the above two fully hydrometallurgical zinc smelting technologies, the oxygen pressure leaching zinc smelting method has a better recovery rate and better overall efficiency within the same system operation time, but the process has relatively high requirements for production equipment. Its main equipment is the hydrometallurgical zinc smelting reactor, which has a high temperature and high pressure acidic environment inside, a reaction temperature of about 150°C, a leaching pressure of about 1300kPa, and a viscous slurry. Conventional float-type level gauges are susceptible to corrosion and have a short lifespan. However, there is a partition wall structure inside the hydrometallurgical zinc smelting reactor. The slurry level in each sub-chamber cannot be obtained by simply subtracting the inlet material volume from the outlet material volume and the exhaust volume. This limits the automation level of the oxygen pressure leaching zinc smelting system, and the operation quality depends on manual experience.

[0003] The hydrometallurgical zinc smelting reactor is a special equipment. At present, there are relatively few scientific research and transformation results on the measurement of slurry level in each chamber under production conditions. The existing technology proposes to use the current feedback of the stirring paddle motor entering the reactor to calculate the liquid level. However, since the stirring shaft is equipped with axial and radial blades at the same time, the force is complex, and the slurry stirring state cannot be accurately monitored. In essence, the feedback current of the stirring paddle motor lacks analytical basis, and the calculated liquid level has limited credibility. At present, there is no effective and accurate measurement method for the slurry level inside the hydrometallurgical zinc high-pressure oxygen-enriched smelting equipment. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a reaction container, a device and a method for measuring the liquid level in the container in view of the deficiencies in the prior art, so as to achieve accurate measurement of the liquid level in the container.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a device for measuring the liquid level in a container, comprising:

[0006] Pedestal;

[0007] A driving shaft, the top end of which is fixedly connected to the driving device, and the bottom end of which passes through the center of the base and is fixedly connected to a main reflector disposed below the base and parallel to the base;

[0008] The main reflector can rotate on a horizontal plane driven by the driving shaft;

[0009] The lower surface of the main reflector is a reflective surface, and the upper surface is electrically connected to the base through a conductive structure;

[0010] A sliding reflector is installed below the main reflector on one side of the driving shaft and can rotate synchronously with the main reflector; the sliding reflector is parallel to the main reflector and can move in the vertical direction;

[0011] An infrared detector mounted on the lower surface of the primary reflector;

[0012] or,

[0013] The first sliding reflector and the second sliding reflector are both installed below the main reflector and can rotate synchronously with the main reflector. The first sliding reflector and the second sliding reflector are symmetrically arranged about the extension line of the driving shaft. The first sliding reflector and the second sliding reflector are both parallel to the main reflector and can move in the vertical direction. The upper surface of the first sliding reflector and the upper surface of the second sliding reflector are always at the same height position;

[0014] A first infrared detector and a second infrared detector are installed on the lower surface of the main reflector, and the first infrared detector and the second infrared detector are symmetrically arranged about the extension line of the driving shaft.

[0015] The present invention is based on the difference in infrared characteristics between the inner wall of the reaction container and the slurry, uses a main reflector and a sliding reflector to form an optical path, and constructs the above-mentioned liquid level measuring device in combination with an infrared detector. The measuring device is not susceptible to corrosion and has a long service life. There is no need to install a stirring paddle motor inside the reactor, which solves the problem that the stirring shaft in the prior art is subjected to complex forces due to the simultaneous installation of axial and radial blades, and the slurry stirring state cannot be accurately monitored. The pixel value of the field of view scanning position can be converted through the main reflector angle and the sliding reflector height, which is convenient for judging the dividing line and then calculating the liquid level. It can effectively avoid complex mechanical calculations and slurry flow field analysis, and realize accurate measurement of the liquid level in the container.

[0016] In the present invention, the conductive structure includes a plurality of metal conductive plates fixed on the upper surface of the primary reflector, the metal conductive plates are in contact with a conductive roller, the conductive roller is mounted on a conductive roller bracket, and the conductive roller bracket is electrically connected to the lower surface of the base.

[0017] In the present invention, in order to further ensure reliable electrical connection, the conductive roller bracket is fixedly connected to one end of the spring, and the other end of the spring is connected to the lower surface of the base; the spring jacket is provided with an insulating telescopic sleeve.

[0018] In the present invention, a main positioning gear is installed on the upper surface of the main reflector, and the main positioning gear is meshed with the auxiliary positioning gear. When the main reflector rotates on a horizontal plane, the main positioning gear drives the auxiliary positioning gear to convert the real-time position information of the main reflector into an electrical signal through a positioner installed on the lower surface of the base.

[0019] In the present invention, when the number of sliding reflectors is one, a lifting motor bracket is fixed on the upper surface of the main reflector; a lifting motor is installed on the lifting motor bracket; the lifting motor is used to drive a threaded lifting rod; and the bottom end of the threaded lifting rod is fixedly connected to the sliding reflector.

[0020] In the present invention, when the number of sliding reflectors is 2, a first lifting motor and a second lifting motor are installed on the lifting motor bracket; the first lifting motor is used to drive the first threaded lifting rod, and the second lifting motor is used to drive the second threaded lifting rod; the bottom end of the first threaded lifting rod is fixedly connected to the first sliding reflector, and the second threaded lifting rod is fixedly connected to the second sliding reflector.

[0021] In the present invention, in order to prevent the sliding reflector from swinging away from the rotation plane, a limiting frame is fixed to the lower surface of the main reflector, and the limiting frame is in contact with the side surfaces of the sliding reflector respectively.

[0022] When the number of sliding reflectors is two, two limit frames are fixed to the lower surface of the main reflector, and the two limit frames are symmetrical about the extension line of the driving shaft; the two limit frames are in contact with the side surfaces of the first sliding reflector and the second sliding reflector respectively.

[0023] A partition is provided on the lower surface of the main reflector between the first infrared detector and the second infrared detector; and both sides of the bottom end of the partition are fixedly connected to a shading plate. The partition and the shading plate can separate the first infrared detector and the second infrared detector to ensure that they do not interfere with each other during measurement.

[0024] In the present invention, in order to facilitate cooling of the measuring device, an air inlet and an air outlet are provided on the base.

[0025] The lower surface of the base is fixedly connected to the outer cover; the main reflector, the conductive structure, and all the sliding reflectors are arranged in the outer cover. The outer cover can protect the relevant structures of the measuring device, such as the main reflector, the conductive structure, the sliding reflector, etc. The outer cover should be made of transparent material.

[0026] As an inventive concept, the present invention further provides a reaction container, in which the above-mentioned measuring device is installed, and the base of the measuring device is fixed at the geometric center of the top of the reaction container.

[0027] As an inventive concept, the present invention also provides a wet zinc smelting reactor, which includes a plurality of the above reaction vessels.

[0028] As an inventive concept, the present invention also provides a method for measuring the liquid level height in a container, which is realized by using the measuring device of the present invention. The method includes:

[0029] Calculating the pixel value of the field of view scanning position in the container by using the following formula: P(θ α ,h q ) = f(θ α ,h q ) - f(θ α ,h q-1 ) - … - f(θ α ,h1), P(θ α ,h q ) represents the infrared current response correction function, θ α is the angle between the main reflector and the initial position, 0 < α < π, h q represents the height of the sliding reflector, that is, the distance between the first sliding reflector or the second sliding reflector and the main reflector, q is the sampling point mark of the sliding reflector in the vertical direction, and 1 < q < β, β is the longitudinal sampling density; f(θ α ,h q ) represents the current value at the current sampling position when the angle between the main reflector and the initial position is θ α , f(θ α ,h q-1 ) is the current value at the previous sampling position when the angle between the main reflector and the initial position is θ α , f(θ α ,h1) is the current value at the initial position when the angle between the main reflector and the initial position is θ α ; is the image function after current normalization processing, x and y are the abscissa and ordinate of each pixel point respectively;

[0030] Sharpen the image function to obtain the enhanced infrared distribution matrix A:

[0031] Use the matrix C to obtain the field of view dividing line, and use the field of view dividing line to obtain the liquid level height in the container; The element C (x,y) of the matrix C satisfies the following conditions:

[0032]

[0033] Wherein, mean(A,:) is the average value of all elements of the matrix A, m and n are the number of rows and columns of the matrix A respectively.

[0034] In the present invention, the specific implementation process of obtaining the visual field boundary line using the matrix C includes: if the element value in the matrix C changes from 1 to 0, or from 0 to 1, and S consecutive elements maintain the changed value after the change, then the element 1 at the position where the element value changes is identified as the point on the visual field boundary line, that is, the change position point, and the change position point is the point on the liquid surface in the container. The value of S can be set according to actual use needs, for example, set to 20 elements.

[0035] In the present invention, the horizontal coordinate x and the vertical coordinate y of the transformation position point are calculated using the following formula:

[0036]

[0037] Among them, L1 represents 0.5 times the length of the main reflector, L2 represents the reflection constant; k1 and k2 are the correction coefficients of the horizontal coordinate and the vertical coordinate respectively; A1 represents the sine value of the complementary angle of the reflection angle:

[0038] Through the above formula, the horizontal coordinate x and the vertical coordinate y of the transformation position point can be determined, that is, the coordinates of the point on the liquid surface in the container are determined, and the height of the liquid surface in the container can be known through the coordinates of the point.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The present invention utilizes the difference in infrared characteristics between the inner wall of the reaction container and the slurry to determine the dividing line and then calculate the liquid level, which can effectively avoid complex mechanical calculations and slurry flow field analysis;

[0041] 2. The liquid level measuring device of the present invention is not susceptible to corrosion, can be used in specific high temperature, high pressure, strong acid and alkali environments, and has a long service life;

[0042] 3. The present invention does not need to install a stirring paddle motor inside the reactor, thus avoiding the problem that the stirring shaft of the existing measuring device is subjected to complex forces due to the simultaneous installation of axial and radial blades, and the slurry stirring state cannot be accurately monitored, and can achieve accurate measurement of the liquid level in the reaction container. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a front view of a liquid level measuring device for a zinc hydrometallurgical reactor according to an embodiment of the present invention;

[0044] Figure 2 It is a top view of the liquid level measuring device of the hydrometallurgical zinc smelting reactor according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The upper surface referred to in the embodiments of the present invention below refers to the surface of the corresponding component away from the liquid surface when the liquid level measuring device is installed in the reaction container, and the lower surface refers to the surface of the corresponding component close to the liquid surface. Similarly, the upper end refers to the end of the corresponding component away from the liquid surface, and the lower end refers to the end of the corresponding component close to the liquid surface.

[0046] like Figure 1 and Figure 2 As shown, the liquid level measuring device (i.e., measuring probe) of the embodiment of the present invention is installed at the center position of the top of each chamber of the reaction container, and the entire measuring probe is fixed by relying on the probe base 26. The probe base 26 is disc-shaped and adopts corrosion-resistant and heat-resistant material. The main driving shaft 2 (i.e., driving shaft) opening is reserved at the center of the circle, and the cooling gas inlet 28 and the cooling gas outlet 29 are symmetrically installed at the edge of the probe base 26.

[0047] A main rotating motor 1 (driving device of the main drive shaft, the main rotating motor is arranged at the top of the reaction vessel) is installed at the opening of the refractory material above the probe base 26. The output shaft of the main rotating motor 1 is fixedly connected to the upper end of the main drive shaft 2. The main rotating motor 1 is buried in the opening of the corrosion-resistant and heat-resistant material, and the lower end of the main drive shaft is fixedly connected to the main reflector. The main rotating motor is responsible for providing uniform rotational power in the horizontal direction of the internal mechanism of the probe. 16 groups of conductive rollers 22 are symmetrically installed about the center line (i.e., the axis of the main drive shaft and its extension line) below the probe base 26. The lower surface of the probe base 26 is fixedly connected to the oval probe cover 27. The probe cover is an oval structure with a magnesium fluoride coating on the inside. The probe cover is made of tempered glass. The gap between the probe cover and the base is sealed. The probe cooling gas is designed to be nitrogen, and its pressure is not less than the internal pressure of the reactor to reduce the stress on the probe cover and ensure that the positive pressure is maintained inside the probe when the seam seal is damaged.

[0048] The conductive roller 22 is mounted on the conductive roller bracket 23, and the conductive roller bracket 23 is connected to the lower surface of the probe base 26 through the conductive roller bracket spring 24. The conductive roller bracket spring 24 is provided with an insulating telescopic sleeve 30. The conductive roller is made of metal and is mounted on the conductive roller bracket to supply power to the rotating mechanism in the measuring probe or to realize control signal transmission. The conductive roller bracket is restricted by the insulating telescopic sleeve and can only move in the vertical direction. The two ends of the conductive roller bracket spring are respectively connected to the probe base and the conductive roller bracket. After the measuring device is installed, all the conductive roller bracket springs are in a compressed state to ensure that the conductive roller is in close contact with the conductive disk.

[0049] The main rotating motor 1 is connected to the main reflector 25 via the main driving shaft 2, and drives the main reflector 25 and related mechanisms to rotate counterclockwise at a constant speed.

[0050] The main reflector 25 is a rectangular parallelepiped structure with a square cross section. The side length of the square (i.e., the width and height of the rectangular parallelepiped) is much smaller than the length of the rectangular parallelepiped. The main reflector 25 is made of high-strength resin material, and its lower surface is silver-plated for reflecting infrared rays. At the same time, the main reflector 25 also serves as the base of the internal device of the measuring probe. Eight concentric but non-contacting metal conductive disks 21 are symmetrically installed on its upper part. The conductive disks 21 are in direct contact with the conductive rollers 22 for power supply and control signal transmission; the main positioning gear 18 and the lifting motor bracket 4 are installed on the upper surface of the main reflector 25 to ensure that the relative positions of the first sliding reflector 8, the second sliding reflector 9 and the main reflector 25 are correct. The first sliding reflector limit frame 31 and the second sliding reflector limit frame 32 are installed on the side of the main reflector 25; infrared detector A (first infrared detector 13), infrared detector B (second infrared detector 14) and matching light-shielding partitions are installed below the main reflector 25.

[0051] The main positioning gear 18 rotates counterclockwise at a constant speed with the main reflector 25, and acts as a driving gear to drive the auxiliary positioning gear 20 to convert the real-time position information of the main reflector 25 into an electrical signal through the positioner 19, and transmit it to the local control system for analysis and processing. The positioner 19 is installed near the center of the probe base 26.

[0052] The lifting motor bracket 4 is fixed at the center of the upper surface of the main reflector 25, and is used to install the first lifting motor 3 and the second lifting motor 5. In order to ensure that the first threaded lifting rod 6 and the second threaded lifting rod 7 are respectively aligned with the side screw holes of the first sliding reflector 8 and the second sliding reflector 9 and to maintain uniform rotation force, the lifting motor bracket 4 is designed to symmetrically install the two lifting motors with the main drive shaft 2 as the center.

[0053] The first lifting motor 3 and the second lifting motor 5 receive the same command from the local industrial computer 12 to ensure that the first sliding reflector 8 and the second sliding reflector 9 are always in the same straight line, and the infrared image is updated accurately and orderly. In the embodiment of the present invention, the first sliding reflector 8 and the second sliding reflector 9 have the same size, and the first sliding reflector 8 and the second sliding reflector 9 are always in the same straight line, which means that the height of the first sliding reflector 8 and the second sliding reflector 9 is the same, that is, the distance from the upper surface (reflection surface) of the first sliding reflector 8 and the upper surface (reflection surface) of the second sliding reflector 9 to the lower surface of the main reflector is exactly the same.

[0054] The structures of the first sliding reflector 8 and the second sliding reflector 9 are similar to those of the main reflector 25, and are both designed as rectangular parallelepiped structures. The width of the rectangular parallelepiped is the same as that of the main reflector, and the length is slightly less than that of the main reflector. The thickness is the height of the rectangular parallelepiped, and the thickness is small. The material is a high-strength resin that is the same as the material of the main reflector. The top surface (upper surface) of the sliding reflector A (the first sliding reflector 8) and the sliding reflector B (the second sliding reflector 9) are silver-plated. The sliding reflector A and the sliding reflector B are installed with screw holes on the side near the main drive shaft. Under the joint action of the sliding reflector limit frame and the threaded lifting rod, the sliding reflector maintains a horizontal state and moves in a vertical plane parallel to the main reflector. When the system (i.e., the measuring device) is in operation, the first sliding reflector 8 and the second sliding reflector 9 rely on the first sliding reflector limit frame 31 and the second sliding reflector limit frame 32 respectively. During the rotation of the main reflector 25, they are always in the same vertical plane with the main reflector 25 and remain parallel. The first sliding reflector limit frame 31 and the second sliding reflector limit frame 32 are respectively used to prevent the first sliding reflector 8 and the second sliding reflector 9 from swinging during the rotation process.

[0055] The first infrared detector 13 and the infrared detector 14 are both lead sulfide infrared photoresistors. They are close to the center of the main reflector and are symmetrically installed (symmetrically about the extension line of the main drive shaft) on the lower surface of the main reflector. When the main reflector rotates, the two detectors work simultaneously, and the infrared image of the field of view based on the current intensity is updated in real time by scanning. In order to ensure that the infrared rays measured by the infrared detector come from the preset optical path, infrared detector A shading plate 15 and infrared detector B shading plate 16 are installed, and an infrared detector center partition 17 is provided between the first infrared detector 13 and the infrared detector 14. Figure 1 It can be seen that the infrared detector A shading plate 15 and the infrared detector B shading plate 16 are both L-shaped, the top of the L-shaped vertical part is fixedly connected to the lower surface of the main reflector, and one end of the L-shaped horizontal part is fixedly connected to the infrared detector central partition 17. The infrared detector A shading plate 15 and the infrared detector B shading plate 16 are symmetrically installed about the infrared detector central partition 17.

[0056] The control system is installed on-site outside the hydrometallurgical zinc smelting reactor, and relies on wires to supply power to the mechanism inside the reaction vessel and transmit control signals. The local industrial computer 12 receives system status feedback and is responsible for giving operating instructions. All signals are converted to digital via the analog input / output module 11. The current signals of the first infrared detector 13 and the infrared detector 14 are fed back to the analog input / output module 11 by the power supply 10.

[0057] In another embodiment of the present invention, there may be only one sliding reflector. In this case, the main reflector and the sliding reflector should be installed on one side of the main drive shaft or its extension line (for example Figure 1 The number of the infrared detector, the lifting motor, the spiral lifting rod, and the sliding reflector limit frame are all 1, which are also installed on one side of the main driving shaft or its extension line.

[0058] The infrared rays are reflected from the main reflector to the sliding reflector through the probe cover, and then reflected from the sliding reflector to the infrared detector. By adjusting the positions of the main reflector and the sliding reflector, a circular infrared field scanning image of the monitored reaction vessel is obtained. On this basis, the contact line between the slurry and the inner wall of the reaction vessel is automatically identified according to the image enhancement segmentation method, thereby obtaining the liquid level information.

[0059] by Figure 1 For example, when the liquid level measurement of the hydrometallurgical zinc smelting reactor of the embodiment of the present invention is in operation, the temperature in the reactor is limited to between 145°C and 155°C, and the temperature in the reactor fluctuates back and forth according to the sine law to increase the difference in infrared characteristics between the reaction slurry and the refractory material on the inner wall of the reaction container. The control process is implemented by the local industrial computer 12. The probe is set to rotate one main reflector as an independent cycle, and the infrared detector current is sampled during this cycle. During this period, the height of the sliding reflector remains unchanged. After rotating one circle, the sliding reflector moves downward for a certain distance ( Figure 1 In the figure, 8' and 8" are two positions during the movement of the first sliding reflector, and correspondingly, 9' and 9" are two positions during the movement of the second sliding reflector). It should be noted that the smaller the distance moved, the greater the sampling density, and the more image pixels generated for discrimination, but the longer the time consumed to complete a sampling cycle. The specific setting should take into account the flow velocity of the slurry, and the single sampling cycle time is recommended to be less than 2 minutes. The sampling process repeats the main reflector rotation cycle. The operating range of the sliding reflector is limited by the length of the threaded lifting rod. To ensure the effectiveness of the measuring device, when the sliding reflector moves to the uppermost position, the infrared light source point received by the infrared detector should be above the highest value of the slurry surface when the reaction vessel system is operating normally; similarly, when the sliding reflector moves to the lowermost position, the infrared light source point received by the infrared detector should be below the lowest value of the slurry surface when the reaction vessel system is operating normally. At this time, the infrared light actually received by the infrared detector comes from the slurry surface. After the sliding reflector reaches the lowest limit (i.e., it drops to the lowest position), the measuring device is reset to the initial state and the above process is repeated.

[0060] Another embodiment of the present invention provides an infrared image enhancement segmentation processing method based on the above device, which can indirectly measure the slurry level inside the hydrometallurgical zinc smelting reactor by analyzing the infrared characteristics inside the reactor, and provide a control basis for the system and operators. Specifically, it includes:

[0061] After the infrared detector current signal is filtered, the continuous current is segmented and sampled, and the instantaneous value of the current intensity is corrected, that is, the pixel value converted to the field of view scanning position through the main reflector angle and the sliding reflector height.

[0062] Get image based on current correction value There are:

[0063]

[0064] P(θ α , h q ) = f(θ α , h q ) - f(θ α , h q-1 ) - … - f(θ α , h1);

[0065] Among them, P(θ α , h q ) represents the infrared current response correction function, θ α is the angle between the primary mirror and the initial position, where 0 < α < π, and α is the horizontal sampling density; h q represents the height of the sliding mirror, that is, the distance between the sliding mirror A and the sliding mirror B and the primary mirror, where q is the vertical sampling point mark of the sliding mirror, and 1 < q < β, and β is the longitudinal sampling density; f(θ α , h q ) represents the current value at the current sampling position when the angle between the primary mirror and the initial position is θ α , f(θ α , h q-1 ) is the current value at the previous sampling position at the angle of θ α , and f(θ α , h1) is the initial position current value at the angle of θ α , is the image function after current normalization processing, and x and y are the horizontal and vertical coordinates of each pixel point respectively. f(θ α , h q ), f(θ α , h q-1 ) are obtained by detecting with an infrared detector. For easy judgment, the second-order differential method is used to sharpen the image, and we get:

[0066]

[0067] In the above formula, A is the enhanced infrared distribution matrix, and each element in the matrix A corresponds to the enhanced image pixel point, and its dimension is determined by α and β.

[0068] Further design the binarization threshold, and there is:

[0069]

[0070] Among them, mean(A, :) is the average value of all elements of the matrix A, m and n are the number of rows and columns of the matrix A respectively, then let the element C of the judgment matrix C (x,y)The following conditions must be met:

[0071]

[0072] Further determine the distribution of elements in the judgment matrix C: the matrix is ​​composed of element 0 and element 1, and the transformation position point is searched row by row from left to right. If the element value changes from 1 to 0 or the element value changes from 0 to 1, and a number of consecutive elements (set to 20 elements in the embodiment of the present invention) maintain the changed value after the above change occurs, then the 1 element (i.e. element 1, the element whose value at the transformation position is 1) at which the element value changes is determined to be the transformation position point (i.e. the point on the liquid surface in the container); further, the horizontal coordinate x, the vertical coordinate y and θ of the element are determined. α 、h q The relationship can be expressed as:

[0073]

[0074] Where L1 represents 0.5 times the length of the main reflector, L2 represents the reflection constant, which is determined by the infrared detector model; k1 and k2 are the correction coefficients for the horizontal and vertical coordinates respectively (k1 and k2 are empirical coefficients, for example, both k1 and k2 can be less than 0.5); A1 represents the sine value of the complementary angle of the reflection angle:

[0075]

[0076] Through the above formula, the horizontal coordinate x and the vertical coordinate y of the transformation position point can be determined, that is, the coordinates of the point on the liquid surface in the container are determined, and the height of the liquid surface in the container can be known through the coordinates of the point.

[0077] Repeat the above steps to obtain the liquid level information in real time, and transmit the obtained liquid level information to the upper control system in real time.

[0078] Example:

[0079] Taking a domestic enterprise's hydrometallurgical zinc reactor as the object, a 1:10 single-chamber model was established with a temperature of 145°C to 155°C and a pressure of 1300 kPa. The main reflector speed of the probe was set to 0.5 r / s, and the sliding reflector moved down 1 mm after each independent cycle, and the field sampling density was 100×100. Since the material in the single-chamber leaching reaction container is controllable, the theoretically calculated slurry height is similar to the liquid level height calculated by the method of the present invention, and the experimental error is less than 10%, which confirms the effectiveness and practical significance of the invention.

Claims

1. A device for measuring the liquid level in a container, characterized in that: include: Pedestal; A driving shaft, the top end of which is fixedly connected to the driving device, and the bottom end of which passes through the center of the base and is fixedly connected to a main reflector disposed below the base and parallel to the base; The main reflector can rotate on a horizontal plane driven by the driving shaft; The lower surface of the main reflector is a reflective surface, and the upper surface is electrically connected to the base through a conductive structure; A sliding reflector is installed below the main reflector on one side of the driving shaft and can rotate synchronously with the main reflector; the sliding reflector is parallel to the main reflector and can move in the vertical direction; An infrared detector mounted on the lower surface of the primary reflector; or, The first sliding reflector and the second sliding reflector are both installed below the main reflector and can rotate synchronously with the main reflector. The first sliding reflector and the second sliding reflector are symmetrically arranged about the extension line of the driving shaft. The first sliding reflector and the second sliding reflector are both parallel to the main reflector and can move in the vertical direction. The upper surface of the first sliding reflector and the upper surface of the second sliding reflector are always at the same height position; A first infrared detector and a second infrared detector are installed on the lower surface of the main reflector, and the first infrared detector and the second infrared detector are symmetrically arranged about the extension line of the driving shaft.

2. The device for measuring the liquid level in a container according to claim 1, characterized in that: The conductive structure includes a plurality of metal conductive plates fixed on the upper surface of the primary reflector, the metal conductive plates are in contact with a conductive roller, the conductive roller is mounted on a conductive roller bracket, and the conductive roller bracket is electrically connected to the lower surface of the base.

3. The device for measuring the liquid level in a container according to claim 2, characterized in that: The conductive roller bracket is fixedly connected to one end of the spring, and the other end of the spring is connected to the lower surface of the base; the outer sleeve of the spring is provided with an insulating telescopic sleeve.

4. The device for measuring the liquid level in a container according to claim 1, characterized in that: A main positioning gear is installed on the upper surface of the main reflector, and the main positioning gear is meshed with the auxiliary positioning gear. When the main reflector rotates on a horizontal plane, the main positioning gear drives the auxiliary positioning gear to convert the real-time position information of the main reflector into an electrical signal through a positioner installed on the lower surface of the base.

5. The device for measuring the liquid level in a container according to claim 1, characterized in that: A lifting motor bracket is fixed on the upper surface of the main reflector; a lifting motor is installed on the lifting motor bracket; the lifting motor is used to drive a threaded lifting rod; the bottom end of the threaded lifting rod is fixedly connected to the sliding reflector.

6. The device for measuring the liquid level in a container according to claim 5, characterized in that: The first lifting motor and the second lifting motor are installed on the lifting motor bracket; the first lifting motor is used to drive the first threaded lifting rod, and the second lifting motor is used to drive the second threaded lifting rod; the bottom end of the first threaded lifting rod is fixedly connected to the first sliding reflector, and the second threaded lifting rod is fixedly connected to the second sliding reflector.

7. The device for measuring the liquid level in a container according to claim 1, characterized in that: A limit frame is fixed on the lower surface of the main reflector, and the limit frames are in contact with the side surfaces of the sliding reflector respectively; or, two limit frames are fixed on the lower surface of the main reflector, and the two limit frames are symmetrical about the extension line of the driving shaft; the two limit frames are in contact with the side surfaces of the first sliding reflector and the second sliding reflector respectively.

8. The device for measuring the liquid level in a container according to any one of claims 1 to 7, characterized in that: When the first infrared detector and the second infrared detector are installed on the lower surface of the main reflector, a partition is provided on the lower surface of the main reflector between the first infrared detector and the second infrared detector; Both sides of the bottom end of the partition are fixedly connected to a shading plate.

9. The device for measuring the liquid level in a container according to any one of claims 1 to 7, characterized in that: An air inlet and an air outlet are provided on the base.

10. The device for measuring the liquid level in a container according to any one of claims 1 to 7, characterized in that: The lower surface of the base is fixedly connected to the outer cover; the main reflector, the conductive structure, and all the sliding reflectors are arranged in the outer cover.

11. A reaction container, characterized in that: The reaction container is installed with the measuring device according to any one of claims 1 to 10, and the base of the measuring device is fixed at the geometric center of the top of the reaction container.

12. A hydrometallurgical zinc smelting reactor, characterized in that: Comprising a plurality of reaction containers as described in claim 11.

13. A method for measuring the liquid level in a container, implemented by using the measuring device according to any one of claims 1 to 10, characterized in that: The method includes: The pixel value of the scanning position in the field of view within the container is calculated using the following formula: P(θ α ,h q ) = f(θ α ,h q ) - f(θ α ,h q-1 ) - … - f(θ α ,h1), P(θ α ,h q ) represents the infrared current response correction function, θ α is the angle between the primary mirror and the initial position, 0 < α < π, h q represents the height of the sliding mirror, that is, the distance between the first sliding mirror or the second sliding mirror and the primary mirror, q is the sampling point mark of the sliding mirror in the vertical direction, and 1 < q < β, β is the longitudinal sampling density; f(θ α ,h q ) represents the current value at the current sampling position when the angle between the primary mirror and the initial position is θ α , f(θ α ,h q-1 ) is the current value at the previous sampling position when the angle between the primary mirror and the initial position is θ α , f(θ α ,h1) is the current value at the initial position when the angle between the primary mirror and the initial position is θ α ; is the image function after current normalization, x and y are the abscissa and ordinate of each pixel point respectively; Sharpen image function The enhanced infrared distribution matrix A is obtained: Using the matrix C to obtain the field of view boundary line, and using the field of view boundary line to obtain the height of the liquid level in the container; The element C of the matrix C (x,y) The following conditions must be met: in, mean(A,:) is the average value of all elements in matrix A, where m and n are the number of rows and columns of matrix A respectively.

14. The method according to claim 13, characterized in that The specific implementation process of using matrix C to obtain the field of view boundary line includes: if the element value in matrix C changes from 1 to 0, or changes from 0 to 1, and S consecutive elements maintain the changed value after the change, then element 1 at the position where the element value changes is identified as the point on the field of view boundary line, that is, the transformation position point, and the transformation position point is the point on the liquid surface in the container.

15. The method according to claim 14, characterized in that The horizontal and vertical coordinates of the transformed position point are calculated using the following formula: Among them, L1 represents 0.5 times the length of the main reflector, L2 represents the reflection constant; k1 and k2 are the correction coefficients of the horizontal coordinate and the vertical coordinate respectively; A1 represents the sine value of the complementary angle of the reflection angle:

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