Flat plate type catalyst pilot plant test sample cutting method and sample quantity calculation method
By cutting and calculating sample quantity based on plate indentation in plate type catalyst pilot detection, the problem of inaccurate sample edge-skin adhesion and inaccurate sample quantity calculation in catalyst pilot detection is solved, and the reliability of experimental results and the accuracy of performance evaluation are improved.
Patent Information
- Application Number
- CN202510134940.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2025-06-20
AI Technical Summary
In the prior art, flat-type catalysts are prone to collapse and sticking after cutting during pilot testing, which affects the experimental results of flue gas flowability. At the same time, there is a lack of effective sample quantity calculation method, which affects the performance evaluation of catalysts.
A flat-type catalyst test sample cutting method is provided, which is tailored according to the indentation of the catalyst plate body to ensure the integrity of the indentation, and provides a sample quantity calculation method, and then rounded by calculating the theoretical sample quantity through specific surface area and sample box width.
The cutting method avoids edge-collapse adhesion of the test sample, improves the reliability of the flue gas flowability experimental results, and more accurately detects the catalyst performance through accurate sample count calculation.
Smart Images
Figure CN120177140A_ABST
Abstract
Description
Technical Field
[0001] Embodiments of the present disclosure belong to the technical field of pilot-scale technology for flat catalysts, and particularly relate to a method for cutting pilot-scale samples of flat catalysts and a method for calculating the number of samples. Background Art
[0002] The substrate of the selective catalytic reduction (SCR) denitration flat catalyst is a wire mesh, and the active components are extruded and adhered to the substrate, having good wear resistance and being widely used in denitration projects with high dust content. The width specification of the flat catalyst plate is generally 450*450mm to 464*464mm, while the full-scale pilot test requires the catalyst cross-section to be (150±2)mm. Therefore, the catalyst single plate needs to be cut before sample loading and testing.
[0003] The SCR denitration flat catalyst is different from the honeycomb catalyst. Its processing technology is to extrude 3 or 4 corrugations on the single plate, and achieve a high open pore rate through the arrangement and assembly of different upper and lower corrugations. And the plate has a certain flexibility to improve the anti-blocking and ash-accumulation ability of the catalyst. Different catalyst manufacturers have different extrusion quantities for the corrugation design of the single plate. If the edge is directly cut, it is easy to cause the collapse and adhesion of the pilot-scale catalyst sample, thus affecting the experimental results of detecting the flue gas flowability.
[0004] In addition, the geometric specific surface area of the conventional flat catalyst is determined by the number of catalyst sheets in the monomer and the area of the single plate. However, the cross-section of the laboratory pilot-scale detection device is 150*150mm, and it is impossible to determine the number of plate samples in the test sample box by reducing in equal proportion. The calculation method for the number of pilot-scale detection samples of flat catalysts is not specified in the currently released denitration catalyst detection specifications and standards, and the number of samples in the sample will also affect the evaluation of the catalyst performance. Summary of the Invention
[0005] Embodiments of the present disclosure aim to at least solve one of the technical problems existing in the prior art, and provide a method for cutting pilot-scale samples of flat catalysts and a method for calculating the number of samples.
[0006] One aspect of the present disclosure provides a method for cutting pilot-scale samples of flat catalysts, and the cutting method includes:
[0007] When the distance between the indentations of the flat catalyst is less than the sample width required for the pilot test, cut out a first sample with two indentations and a second sample with one indentation; wherein, the central axis of the first sample coincides with the middle line of its two indentations, and the central axis of the second sample coincides with its indentation;
[0008] When the distance between the indentations of the flat catalyst is greater than the sample width required for the pilot test, a third sample with one indentation is cut out; wherein, the central axis of the third sample deviates from its indentation.
[0009] Further, when the distance between the indentations of the flat catalyst is 130 mm and the sample width required for the pilot test is 150 mm, the cutting method includes:
[0010] Cut respectively at 10 mm on the first side of the first indentation and 10 mm on the second side of the second indentation of the flat catalyst to obtain the first sample.
[0011] Further, when the distance between the indentations of the flat catalyst is 130 mm and the sample width required for the pilot test is 150 mm, the cutting method includes:
[0012] Cut respectively at 75 mm on both sides of the third indentation of the flat catalyst to obtain the second sample.
[0013] Optionally, the cutting method further includes:
[0014] Install a first support bar at the central axis of the inner surface of the top of the pilot test sample loading box; wherein, the height of the first support bar is equal to the height of the first indentation and the second indentation;
[0015] Install a second support bar and a third support bar respectively at 10 mm from the opposite side edges on the inner surface of the bottom of the pilot test sample loading box; wherein, the height of the second support bar and the third support bar is equal to the height of the third indentation.
[0016] Further, when the distance between the indentations of the flat catalyst is 170 mm and the sample width required for the pilot test is 150 mm, the cutting method includes:
[0017] Cut respectively at 20 mm and 130 mm on both sides of the fourth indentation of the flat catalyst to obtain the third sample.
[0018] Optionally, the cutting method further includes:
[0019] Install a fourth support bar at 20 mm from the first side on the inner surface of the top of the pilot test sample loading box, and install a fifth support bar at 130 mm from the first side on the inner surface of the bottom of the pilot test sample loading box; wherein,
[0020] the height of the fourth support bar and the fifth support bar is equal to the height of the fourth indentation.
[0021] Further, the cutting method further includes: cutting the length of the first sample, the second sample or the third sample to the sample length required for pilot testing.
[0022] Another aspect of the present disclosure provides a method for calculating the number of pilot samples of a flat catalyst, the calculation method including:
[0023] Obtaining the specific surface area of the flat catalyst unit and the width of the pilot sample loading box respectively;
[0024] Calculating the theoretical number of samples based on the specific surface area of the flat catalyst unit and the width of the pilot sample loading box;
[0025] Rounding the theoretical number of samples to obtain the number of pilot samples in the pilot sample loading box.
[0026] Further, the calculating the theoretical number of samples based on the specific surface area of the flat catalyst unit and the width of the pilot sample loading box includes:
[0027] Calculating the theoretical number of samples according to the following formula:
[0028]
[0029] In the formula, n is the theoretical number of samples, A p is the specific surface area of the flat catalyst unit, and L b is the width of the pilot sample loading box.
[0030] Further, the rounding the theoretical number of samples includes:
[0031] Rounding the theoretical number of samples in a rounding-off manner.
[0032] A method for cutting pilot samples of a flat catalyst and a method for calculating the number of samples according to an embodiment of the present disclosure, by cutting with the indentation of the flat catalyst plate as a reference, ensures the integrity of the indentation and avoids the phenomenon of edge collapse and adhesion of pilot samples, thereby ensuring the reliability of the experimental results of the flue gas flowability of the flat catalyst; by converting the number of samples in the loading box based on the specific surface area of the flat catalyst unit, compared with reducing the number of samples proportionally according to the size of the loading box, the catalyst performance of the actual product can be detected more accurately during pilot testing. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 is a schematic diagram of an existing flat catalyst plate;
[0034] Figure 2 is a flowchart of a method for cutting pilot samples of a flat catalyst according to an embodiment of the present disclosure;
[0035] Figure 3 Schematic diagram of cutting pilot samples of another embodiment of the present disclosure;
[0036] Figure 4 Schematic diagram of the arrangement of pilot samples in the sample loading box of another embodiment of the present disclosure;
[0037] Figure 5 Schematic diagram of the structure of the sample loading box of pilot samples of another embodiment of the present disclosure;
[0038] Figure 6 Schematic diagram of cutting pilot samples of another embodiment of the present disclosure;
[0039] Figure 7 Schematic diagram of the arrangement of pilot samples in the sample loading box of another embodiment of the present disclosure;
[0040] Figure 8 Schematic diagram of the structure of the sample loading box of pilot samples of another embodiment of the present disclosure;
[0041] Figure 9 Schematic flow chart of a method for calculating the number of pilot samples of a flat catalyst of another embodiment of the present disclosure. Detailed implementation manners
[0042] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.
[0043] In addition, the described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to give a full understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. can be used. In other cases, well-known methods, devices, implementations or operations are not shown or described in detail to avoid obscuring various aspects of the present disclosure.
[0044] The flow chart shown in the accompanying drawings is only an exemplary illustration, and does not necessarily include all the contents and operations / steps, nor is it necessary to be executed in the described order. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined. Therefore, the actual execution order may be changed according to the actual situation.
[0045] It should be understood that although terms such as first, second, and third may be used in this disclosure to describe various components, these components should not be limited by these terms. These terms are used to distinguish one component from another. Thus, the first component discussed below may be referred to as the second component without departing from the teachings of the concepts of this disclosure. As used in this disclosure, the term "and / or" includes any one of the associated listed items and all combinations of one or more of them.
[0046] Those skilled in the art can understand that the drawings are only schematic diagrams of exemplary embodiments, and the modules or processes in the drawings are not necessarily essential for implementing this disclosure, and thus cannot be used to limit the protection scope of this disclosure.
[0047] SCR denitration flat catalysts are usually applied in the form of flat catalyst units in industrial practice. Usually, 60 to 80 flat catalyst plates as Figure 1 shown are installed in each flat catalyst unit. For example, there are mainly two types of plate bodies in existing applications: one plate body has a width of 460 mm and has four V-shaped indentations, and the distance between every two indentations is 130 mm; the other plate body has a width of 455 mm and has three V-shaped indentations, and the distance between every two indentations is 170 mm. And currently, the cross-section of the usual pilot test detection device is 150 * 150 mm, so it is required that the width of the pilot test samples submitted for inspection be cut to 150 mm.
[0048] As Figure 2 shown, an embodiment of this disclosure provides a method for cutting a pilot test sample of a flat catalyst. The cutting method includes:
[0049] Method M1: When the distance between the indentations of the flat catalyst is less than the width of the sample required for the pilot test, cut out a first sample with two indentations and a second sample with one indentation; wherein, the central axis of the first sample coincides with the middle line of its two indentations, and the central axis of the second sample coincides with its indentation.
[0050] Specifically, as Figure 3 shown, taking a single flat catalyst plate with four V-shaped indentations 31, 32, 33, 34, and the distance between every two indentations is 130 mm as an example, the distance between the indentations is less than the width of the sample required for the pilot test, which is 150 mm. Cut at 10 mm to the left of the indentation 31 and 10 mm to the right of the indentation 32 respectively to obtain a first sample 35 with a width of 150 mm, and its central axis exactly coincides with the middle line of the two indentations 31 and 32. Cut at 75 mm on both sides of the indentation 34 respectively to obtain a second sample 36 with the same width of 150 mm, and its central axis exactly coincides with the indentation 34.
[0051] When conducting pilot tests, the above-mentioned first sample 35 and second sample 36 are stacked alternately in the pilot sample loading box, and the arrangement of the samples in the loading box is as Figure 4 shown.
[0052] To ensure that the pilot samples after cutting have good support in the loading box, as Figure 5 shown, a first support bar 51 can be installed at the mid-axis of the inner surface of the top of the pilot sample loading box, and a second support bar 52 and a third support bar 53 are respectively installed at a distance of 10 mm from the relative two side edges of the inner surface of the bottom of the pilot sample loading box. Ideally, the height of the first support bar 51 is equal to the height of the above-mentioned first indentation 31 and second indentation 32, and the heights of the second support bar 52 and the third support bar 53 are equal to the height of the above-mentioned indentation 34.
[0053] Method M2: When the distance between the indentations of the flat catalyst is greater than the sample width required for pilot tests, a third sample with one indentation is cut out; wherein, the mid-axis of the third sample deviates from its indentation.
[0054] Specifically, as Figure 6 shown, taking a flat catalyst single plate with three V-shaped indentations 61 and a distance of 170 mm between every two indentations 61 as an example, the distance between the indentations 61 is greater than the sample width of 150 mm required for pilot tests. Cuts are made 20 mm to the left and 130 mm to the right of one indentation 61 respectively to obtain a third sample 63 with a width of 150 mm.
[0055] When conducting pilot tests, the above-mentioned third sample 63 is stacked alternately in the reverse direction in the pilot sample loading box, and the arrangement of the samples in the loading box is as Figure 7 shown.
[0056] Correspondingly, to ensure that the pilot samples after cutting have good support in the loading box, as Figure 8 shown, a fourth support bar 84 can be installed 20 mm from the left side of the inner surface of the top of the pilot sample loading box, and a fifth support bar 85 is installed 130 mm from the left side of the inner surface of the bottom of the loading box, that is, 20 mm from the right side. Ideally, the heights of the fourth support bar 84 and the fifth support bar 85 are equal to the height of the above-mentioned indentation 61.
[0057] Exemplarily, after cutting the width of the flat catalyst plate using the above method, the length of the flat catalyst plate can be further cut according to the actual situation based on the size of the pilot sample loading box. For example, when the length of the sample is greater than the length of the loading box, the length of the above-mentioned sample is uniformly cut to be equal to the length of the loading box, which is conducive to obtaining more accurate pilot test results.
[0058] A method for cutting pilot-scale samples of a flat-plate catalyst according to an embodiment of the present disclosure cuts based on the indentation of the flat-plate catalyst plate body, ensuring the integrity of the indentation and avoiding the phenomenon of edge collapse and adhesion of the pilot-scale samples, thereby ensuring the reliability of the experimental results of the flue gas flow-through performance of the flat-plate catalyst.
[0059] As Figure 9 shown, another embodiment of the present disclosure provides a method for calculating the number of pilot-scale samples of a flat-plate catalyst. The calculation method includes:
[0060] Step S1: Obtain the specific surface area of the flat-plate catalyst unit and the width of the pilot-scale sample loading box respectively.
[0061] Specifically, the specific surface area is an important indicator affecting the catalytic effect of the SCR denitration flat-plate catalyst unit. The specific surface area A p is expressed in square meters per cubic meter (m 2 / m 3 ), and can be calculated from the total number of single plates in the catalyst unit, the surface area of the single plate before bending, and the volume of the assembled catalyst unit. The specific surface area of each catalyst unit is a fixed value after being assembled and formed. Currently, the cross-section of the general pilot-scale detection device is 150*150 mm, that is, the width of the pilot-scale sample loading box used during pilot-scale detection is usually 150 mm.
[0062] Step S2: Calculate the theoretical number of samples based on the specific surface area of the flat-plate catalyst unit and the width of the pilot-scale sample loading box.
[0063] Specifically, to ensure that the specific surface area of the pilot-scale sample is consistent with that of the actual industrial product, it is necessary to calculate the number of samples in the pilot-scale sample loading box according to the designed specific surface area. First, calculate the theoretical number of samples according to the following formula:
[0064]
[0065] In the formula, n is the theoretical number of samples, A p is the specific surface area of the flat-plate catalyst unit, and L b is the width of the pilot-scale sample loading box.
[0066] Taking a flat-plate catalyst unit with 68 catalyst single plates and a specific surface area of 300 m 2 / m 3 as an example, when it is necessary to conduct pilot-scale detection on it, after obtaining multiple pilot-scale samples with a width of 150 mm, that is, 0.15 m, which meet the requirements, using the above formula, the theoretical number of samples that should be loaded into the pilot-scale sample loading box is calculated to be 22.5.
[0067] Step S3: Round the theoretical sample quantity to obtain the quantity of pilot-scale samples in the pilot-scale sample loading box.
[0068] Specifically, the rounding of the theoretical sample quantity can be performed by the method of rounding up or down. Taking the theoretical sample quantity of 22.5 obtained in the previous step as an example, after rounding, the quantity of pilot-scale samples in the pilot-scale sample loading box is 23. According to this result, 23 pilot-scale samples with a width of 150 mm should be stacked and loaded into the pilot-scale sample loading box.
[0069] A method for calculating the quantity of pilot-scale samples of a flat catalyst according to an embodiment of the present disclosure converts the quantity of samples in the loading box based on the specific surface area of the flat catalyst unit. Compared with reducing the quantity of samples proportionally according to the size of the loading box, it can more accurately detect the catalyst performance of the actual product during pilot-scale testing.
[0070] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principle of the present disclosure. However, the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered within the protection scope of the present disclosure.
Claims
1. A method for cutting a flat-plate catalyst pilot sample, characterized in that: The cutting method comprises: When the distance between the indentations of the flat catalyst is less than the sample width required for the pilot test, a first sample with two indentations and a second sample with one indentation are cut out; wherein the central axis of the first sample coincides with the middle lines of its two indentations, and the central axis of the second sample coincides with its indentation; When the distance between the indentations of the flat-plate catalyst is greater than the sample width required for the pilot test, a third sample with one indentation is cut out; wherein the central axis of the third sample deviates from its indentation.
2. The cutting method according to claim 1, characterized in that: When the distance between the indentations of the flat catalyst is 130 mm and the sample width required for the pilot test is 150 mm, the cutting method includes: The flat-plate catalyst was cut at 10 mm from the first side of the first indentation and at 10 mm from the second side of the second indentation to obtain a first sample.
3. The cutting method according to claim 2, characterized in that: When the distance between the indentations of the flat catalyst is 130 mm and the sample width required for the pilot test is 150 mm, the cutting method includes: The second sample was obtained by cutting the flat-plate catalyst at 75 mm on both sides of the third indentation.
4. The cutting method according to claim 3, characterized in that: The cutting method further comprises: A first support bar is installed at the central axis of the top inner surface of the pilot sample loading box; wherein the height of the first support bar is equal to the height of the first indentation and the second indentation; A second support bar and a third support bar are respectively installed on the bottom inner surface of the pilot sample loading box at a distance of 10 mm from the opposite two side edges; wherein the height of the second support bar and the third support bar is equal to the height of the third indentation.
5. The cutting method according to claim 1, characterized in that: When the distance between the indentations of the flat catalyst is 170 mm and the sample width required for the pilot test is 150 mm, the cutting method includes: The flat-plate catalyst was cut at 20 mm and 130 mm on both sides of the fourth indentation to obtain a third sample.
6. The cutting method according to claim 5, characterized in that: The cutting method further comprises: A fourth support bar is installed on the top inner surface of the pilot sample loading box at a distance of 20 mm from the first side, and a fifth support bar is installed on the bottom inner surface of the pilot sample loading box at a distance of 130 mm from the first side; wherein, The heights of the fourth support bar and the fifth support bar are equal to the height of the fourth indentation.
7. The cutting method according to any one of claims 1 to 6, characterized in that: The cutting method further includes: cutting the length of the first sample, the second sample or the third sample to the sample length required for the pilot test.
8. A method for calculating the number of flat plate catalyst pilot samples, characterized in that: The calculation method includes: The specific surface area of the flat-plate catalyst unit and the width of the pilot sample loading box are obtained respectively; The theoretical number of samples is calculated based on the specific surface area of the flat-plate catalyst unit and the width of the pilot sample loading box; The theoretical sample quantity is rounded to obtain the pilot sample quantity in the pilot sample loading box.
9. The calculation method according to claim 8, characterized in that: The method of calculating the theoretical number of samples according to the specific surface area of the flat-plate catalyst unit and the width of the pilot sample loading box comprises: The theoretical sample quantity is calculated according to the following formula: Where n is the theoretical number of samples, A p is the specific surface area of the flat-plate catalyst unit, L b The width of the sample box for pilot samples.
10. The calculation method according to claim 8 or 9, characterized in that: The rounding of the theoretical sample quantity comprises: The theoretical sample quantity is rounded off.