Testing Method and Testing System for Partition Dust Removal Efficiency

Abstract

The present invention relates to the technical field of boiler emissions and discloses a test method and a test system for the dust removal efficiency of partitions. The test method includes measuring the dust removal efficiency of the boiler dust collector by using the grid method to obtain the dust collector efficiency η 总 , collecting the dust in the bin pump by using a density box with a preset volume, respectively measuring the weights of the density box filled with the dust and the empty density box. The dust density ρ in the bin pump satisfies that within a preset time, the volume of the dust in the bin pump is measured by using a detector to obtain the dust volume υ of the dust in the bin pump. The dust removal efficiency η of the i-th dust removal partition in multiple dust removal partitions i satisfies. The test method of the present invention can test the dust removal efficiency of the partitions of the boiler dust collector, so as to accurately evaluate the dust removal performance of the partitions, and provide reference for relevant technical personnel when maintaining, overhauling and conducting relevant acceptance inspections on the partitions of the boiler dust collector.

Description

Technical Field

[0001] The present invention relates to the technical field of boiler emissions, and specifically, to a method and a system for testing the dust removal efficiency of partitions. Background Art

[0002] To meet the requirements of environmental protection emissions, domestic coal-fired boilers are all equipped with dust collectors, and the vast majority of the dust collectors are electrostatic precipitators or bag filters. The dust removal efficiency is a crucial performance index of the dust collector. At the same time, the efficiency of the dust collector reflects the quality of the operation of the dust collector.

[0003] In the related art, how to test the dust removal efficiency of partitions of an electrostatic precipitator is a technical problem to be solved urgently. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, an embodiment of the present invention provides a method and a system for testing the dust removal efficiency of partitions. The testing method can test the dust removal efficiency of partitions of a boiler dust collector, so as to accurately evaluate the dust removal performance of the partitions, and provide reference for relevant technical personnel when maintaining, overhauling and conducting relevant acceptance inspections on the partitions of the boiler dust collector.

[0005] The testing method for the dust removal efficiency of partitions of the present invention, wherein the boiler dust collector includes a plurality of dust removal partitions, and each of the dust removal partitions is provided with a corresponding bin pump. The testing method includes:

[0006] Measuring the dust removal efficiency of the boiler dust collector by using the grid method to obtain the dust collector efficiency η 总 ;

[0007] Collecting the dust in the bin pump by using a density box with a preset volume, and respectively measuring the weights of the density box filled with the dust and the empty density box. The dust density ρ in the bin pump satisfies:

[0008]

[0009] wherein, 装 is the weight of the density box filled with the dust, 空 is the weight of the empty density box for the dust, 箱 is the preset volume of the empty density box for the dust;

[0010] Measuring the volume of the dust in the bin pump by using a detector within a preset time to obtain the dust volume υ of the dust in the bin pump;

[0011] The dust removal efficiency η i of the i-th dust removal partition among the plurality of dust removal partitions satisfies:

[0012]

[0013]

[0014] Among them,

[0015] n is the number of dust removal zones in the boiler dust collector;

[0016] M is the total mass of dust collected by the boiler dust collector;

[0017] η 总 is the dust removal efficiency of the boiler dust collector;

[0018] ρ i or ρ i is the dust density of the i-th or j-th dust removal zone, where i ∈ n and j ∈ n;

[0019] υ i or υ j is the dust volume of the i-th or j-th dust removal zone, where i ∈ n and j ∈ n;

[0020] η i is the dust removal efficiency of the i-th dust removal zone.

[0021] The test method for the dust removal efficiency of the partitions of the present invention can test the dust removal efficiency of the partitions of the boiler dust collector, so as to accurately evaluate the dust removal performance of the partitions. When maintaining, overhauling and conducting relevant acceptance inspections on the partitions of the boiler dust collector, it provides reference for relevant technical personnel. That is to say, the tested dust removal efficiency of the partitions can provide technical support for relevant technical personnel, so as to provide quantitative data support for acceptance evaluation work such as local transformation, overhaul and maintenance of the boiler dust collector.

[0022] Optionally, the grid method includes:

[0023] Optionally, the detector is a non-contact γ-ray detector.

[0024] Optionally, the density box is square, and the side length of the density box is 400 mm to 600 mm.

[0025] Optionally, the dust in the silo pump is collected by using a density box with a preset volume, and the weights of the density box filled with the dust and the empty density box are measured respectively. The dust density ρ in the silo pump satisfies the following:

[0026] The dust density of the dust in the silo pump is measured multiple times.

[0027] Optionally, the preset time is 1 h to 2 h.

[0028] The test system of the present invention includes:

[0029] A fixed plate, which is arranged on the silo pump;

[0030] A detector, which is the above-mentioned detector and is arranged on the fixed plate;

[0031] A data acquisition board, which is electrically connected to the detector;

[0032] A computer, which is electrically connected to the data acquisition board.

[0033] Optionally, the test system further includes:

[0034] An amplifier, which is electrically connected between the detector and the data acquisition board.

[0035] Optionally, at least one detector is arranged on each silo pump.

[0036] Optionally, the fixed plate is located in the upper middle part of the silo pump, and the detector is parallel to the horizontal plane. Description of the Drawings

[0037] Figure 1 is a schematic diagram of the test system according to an embodiment of the present invention.

[0038] Reference numerals: 1 - silo pump, 2 - detector, 3 - amplifier, 4 - high-voltage power supply, 5 - fixed plate, 6 - data acquisition board, 7 - computer. Detailed Embodiments

[0039] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0040] The test method for the partition dust removal efficiency according to an embodiment of the present invention will be described below with reference to the drawings. The test method for the partition dust removal efficiency according to an embodiment of the present invention includes: measuring the dust removal efficiency of the boiler dust collector by using the grid method to obtain the dust collector efficiency η 总 ;

[0041] Collecting the dust in the silo pump by using a density box with a preset volume, and respectively measuring the weights of the density box filled with dust and the empty density box. The dust density ρ in the silo pump satisfies:

[0042]

[0043] Wherein, 装 is the weight of the density box filled with dust, 空 is the weight of the empty density box for dust,箱 The preset volume of the density box for empty dust;

[0044] Within a preset time, use a detector to measure the volume of the dust located in the silo pump, and obtain the dust volume v of the dust in the silo pump;

[0045] The dust removal efficiency η of the i-th dust removal zone among multiple dust removal zones i Satisfy:

[0046]

[0047]

[0048] Among them, is the number of dust removal zones in the boiler dust collector;

[0049] M is the total mass of the dust collected by the boiler dust collector;

[0050] η 总 Is the dust removal efficiency of the boiler dust collector;

[0051] ρ i Or ρ i Is the dust density of the i-th or j-th dust removal zone, i ∈ n, j ∈ n;

[0052] υ i Or v j Is the dust volume of the i-th or j-th dust removal zone, i ∈ n, j ∈ n;

[0053] η i Is the dust removal efficiency of the i-th dust removal zone.

[0054] The test method for the dust removal efficiency of each zone in the embodiments of the present invention can test the dust removal efficiency of each zone of the boiler dust collector, so as to accurately evaluate the dust removal performance of each zone. When maintaining, repairing, and conducting relevant acceptance inspections on the zones of the boiler dust collector, it provides a reference for relevant technical personnel. That is to say, the tested dust removal efficiency of each zone can provide technical support for relevant technical personnel, so as to provide quantitative data support for acceptance evaluation work such as local transformation, repair and maintenance of the boiler dust collector.

[0055] Some specific embodiments of the test method for the dust removal efficiency of each zone of the present invention will be described below.

[0056] It should be noted that the boiler dust collector includes multiple dust removal zones, and each dust removal zone is provided with a corresponding silo pump 1, that is, the soot in the boiler dust collector passes through multiple dust removal zones in sequence, and each dust removal zone processes the soot in sequence.

[0057] The test method for the dust removal efficiency of each zone of the present invention includes:

[0058] S100: Measure the dust removal efficiency of the boiler dust collector using the grid method to obtain the dust collector efficiency η 总 .

[0059] Arrange the sampling tube at the measurement point in the sampling hole. The sampling tube sends the flue gas into the automatic smoke and dust (gas) tester, and successively measures the dust emission concentration in the flue at the inlet and outlet of the dust collector to obtain the dust concentration C in the inlet flue of the dust collector in , the dust concentration C in the outlet flue out , and then calculate the dust collector efficiency η according to the following formula 总 .

[0060]

[0061] C in — Inlet flue gas dust concentration (dry flue gas under standard conditions), unit: milligram per cubic meter (mg / m 3 );

[0062] C out — Outlet flue gas dust concentration (dry flue gas under standard conditions), unit: milligram per cubic meter (mg / m 3 );

[0063] α — Dust leakage rate of the dust collector body

[0064] S200: Collect the dust in the silo pump 1 using a density box with a preset volume, and measure the weights of the density box filled with dust and the empty density box respectively. The dust density ρ in the silo pump 1 satisfies:

[0065]

[0066] Wherein, 装 is the weight of the density box filled with dust, 空 is the weight of the empty dust density box, 箱 is the preset volume of the empty dust density box

[0067] Specifically, first measure the weight m 空 of the density box, and then measure the weight m 装 of the density box filled with dust. Through the formula that the dust density ρ in the silo pump 1 satisfies, the dust density ρ can be obtained

[0068] It should be noted that the state of the dust in the density box is the same as the state of the dust in the silo pump 1, that is, the state of the dust is the dust in the free and loose state

[0069] In some specific embodiments, the density box is square, and the side length of the density box is 400 mm to 600 mm. Among them, the preset volume can be obtained according to the side length of the density box

[0070] Optionally, the side length of the density box is 585 mm or 500 mm.

[0071] Optionally, the wall thickness of the density box is 5 mm.

[0072] Optionally, the density box is made of ordinary steel.

[0073] Optionally, the inner surface of the density box is smooth, the structure of the density box is firm, and a handle is provided on the outside of the density box.

[0074] S210: Measure the dust density of the dust in the bin pump 11 multiple times.

[0075] Specifically, in order to improve the accuracy of the dust density, the dust in the bin pump 1 is measured multiple times to obtain multiple dust densities, and then the average value of the multiple dust densities is calculated.

[0076] S300: Measure the volume of the dust in the bin pump 1 by using a detector within a preset time to obtain the dust volume υ of the dust in the bin pump 1;

[0077] At a certain height in the bin pump or the ash hopper, a non-contact γ-ray detector is used to receive the γ-ray of the dust in the bin pump or the ash hopper belonging to each partition of the dust collector. The detector converts the received γ-ray into an electrical pulse signal. The electrical pulse signal is sent to the data acquisition board through an amplifier. The data acquisition board has the functions of signal discrimination and data processing. The data acquisition board transmits the processed data to the computer, and the computer calculates the volume of the fly ash. The power supply of the detector is completed by a dedicated high-voltage power supply; measure the dust volume in a measurement partition within a certain time.

[0078] Working principle: Using a passive nuclear detector as a passive measuring instrument, it can receive the γ-ray with a wavelength in the range of 1 pm to 10 nm emitted by the dust itself. Within the measurement range of the detector, when the amount of dust changes, the ray intensity also changes regularly. According to the change of the ray intensity, the height of the dust is obtained. Since the γ-ray has strong penetration ability and can penetrate substances such as metal, it can be installed outside the container to be measured to measure the height of the dust.

[0079] Taking a silo pump as an example, the measurement process of the dust volume is introduced in detail: The silo pump is a cylindrical barrel with a circular bottom, approximately cylindrical. When the dust gradually accumulates in the silo pump under the action of gravity, the γ-rays released by the dust measured by the detector will change. When the dust stops entering from the inlet of the silo pump, the total radiation intensity received by the detector is determined. There is a fixed functional relationship between the height of the dust and the total radiation intensity received by the detector (on the premise that the height of the silo pump is certain). Thus, the height of the upper surface of the dust pile can be obtained. The other boundary lengths of the dust pile are the same as those of the silo pump. Therefore, the volume of the dust pile can be calculated. During the whole test process, there will be multiple repetitions of the above process, and the cumulative value of the volume is the final volume measurement value.

[0080] In some specific embodiments, the preset time is 1h - 2h.

[0081] In some specific embodiments, the detector is a non-contact γ-ray detector, which has the advantages of not containing a radiation source, cleverly using the γ-rays released by the dust, and obtaining the relevant height of the dust pile by measuring and analyzing the ray intensity; the detector is a non-contact level gauge, which is installed outside the container, does not require drilling holes in the container, has simple installation, convenient debugging, and the installation does not affect the operation of the unit; the detector has high reliability, long life and is maintenance-free.

[0082] S400: The dust removal efficiency η of the i-th dust removal zone among multiple dust removal zones i Satisfy:

[0083]

[0084]

[0085] Wherein,

[0086] n is the number of dust removal zones in the boiler dust collector;

[0087] M is the total mass of the dust collected by the boiler dust collector;

[0088] η 总 Is the dust removal efficiency of the boiler dust collector;

[0089] ρ i Or ρ i Is the dust density of the i-th or j-th dust removal zone, i ∈ n, j ∈ n;

[0090] v i Or υ j Is the dust volume of the i-th or j-th dust removal zone, i ∈ n, j ∈ n;

[0091] η i Is the dust removal efficiency of the i-th dust removal zone.

[0092] Specifically, The total mass of dust entering the boiler dust collector within a preset time; is the mass of dust entering the i-th dust removal zone within a preset time, ρ i · i is the mass of dust collected in the i-th dust removal zone within a preset time.

[0093] For example, taking a boiler dust collector with three dust removal zones as an example for specific description.

[0094] The dust removal efficiency of the boiler dust collector is η 总 , and the dust densities in the first dust removal zone, the second dust removal zone, and the third dust removal zone are ρ1, ρ2, and ρ3 respectively. The dust volume υ1 in the bin pump 1 corresponding to the first dust removal zone, the dust volume υ2 in the bin pump 1 corresponding to the second dust removal zone, and the dust volume υ3 in the bin pump 1 corresponding to the third dust removal zone.

[0095] The total mass M of dust collected by the boiler dust collector is M = 1·1 + 2·2 + 3·3. The dust removal efficiency of the first dust removal zone is The dust removal efficiency of the second dust removal zone is The dust removal efficiency of the second dust removal zone is

[0096] The test system of the embodiment of the present invention includes a fixing plate 5, a detector 3, a data acquisition board 6, and a computer 7. As Figure 1 shown, the fixing plate 5 is arranged on the bin pump 1, the detector 3 is arranged on the fixing plate 5, the data acquisition board 6 is electrically connected to the detector 3, and the computer 7 is electrically connected to the data acquisition board 6. Among them, the data acquisition board has the functions of signal discrimination and data processing. The data acquisition board transmits the processed data to the computer, and the computer obtains the dust volume of a single measurement according to the measured dust pile height, the known boundary parameters of the bin pump or container, the measured dust density, etc. The computer can also perform addition calculation on the volume during the measurement process and calculate the efficiency of each dust removal zone of the dust collector according to the calculation formula of the aforementioned dust removal zones.

[0097] Specifically, the data acquisition board discriminates and processes the received signal pulses, and performs technical and data filtering processing on the electrical pulse signals

[0098] In some specific embodiments, as Figure 1 shown, the test system further includes an amplifier 3, and the amplifier 3 is electrically connected between the detector 2 and the data acquisition board 6. The function of the amplifier is to be able to amplify the signal output by the detector above the signal threshold of the data receiver.

[0099] Specifically, the amplifier 3 can transmit the amplified signal to the data acquisition board 6,

[0100] In some specific embodiments, such as Figure 1 shown, the test system further includes a high-voltage power supply 4, and the high-voltage power supply 4, the amplifier 3, and the detector 2 are integrated devices. Only when the high-voltage power supply is powered can the detector output a corresponding current. In this solution, a positive high-voltage power supply is preferably used, so that the detector can output a relatively low and stable current and noise.

[0101] In some specific embodiments, such as Figure 1 shown, at least one detector 2 is provided on each silo pump 1, and the dust volume of the dust in each silo pump 1 can be measured.

[0102] In some specific embodiments, such as Figure 1 shown, the fixing plate 5 is located in the upper middle part of the silo pump 1, and the detector 2 is parallel to the horizontal plane. The installation is between 70% and 80% of the volume because the best storage capacity of the dust in the silo pump in actual production is between 70% and 80%; the silo pump or containers with the same function are arranged vertically on the ground, so that the detector being parallel to the ground can make the measurement result of the height of the dust pile more accurate.

[0103] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0104] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0105] In the present invention, unless otherwise clearly specified or limited, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0106] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely means that the first feature has a lower horizontal height than the second feature.

[0107] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0108] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A test method for the dust removal efficiency of partitions, characterized in that Comprising: The boiler dust collector includes a plurality of dust removal zones, and each of the dust removal zones is provided with a corresponding bin pump. The testing method includes: The dust removal efficiency of the boiler dust collector is measured using the grid method to obtain the dust collector efficiency η 总 ; Collecting the dust in the bin pump by using a density box with a preset volume, and respectively measuring the weights of the density box filled with the dust and the empty density box. The dust density ρ in the bin pump satisfies: where m 装 is the weight of the density box filled with the dust, m 空 is the weight of the empty density box for the dust, V 箱 is the preset volume of the empty density box for the dust; Measuring the volume of the dust in the bin pump by using a detector within a preset time to obtain the dust volume υ of the dust in the bin pump; The dust removal efficiency η of the i-th dust removal zone among multiple dust removal zones i Satisfies: Wherein, n is the number of dust removal zones in the boiler dust collector; M is the total mass of the dust collected by the boiler dust collector; η 总 is the dust removal efficiency of the boiler dust collector; ρ i or ρ j is the dust density of the i-th or j-th dust removal zone, where i ∈ n, j ∈ n; υ i or υ j is the dust volume of the i-th or j-th dust removal zone, where i ∈ n and j ∈ n; η i is the dust removal efficiency of the i-th dust removal zone.

2. The test method according to claim 1, wherein The detector is a non-contact γ-ray detector.

3. The test method according to claim 2, wherein The density box is square, and the side length of the density box is 400 mm to 600 mm.

4. The test method according to claim 1, wherein The collecting the dust in the bin pump by using a density box with a preset volume, and respectively measuring the weights of the density box filled with the dust and the empty density box. The dust density ρ in the bin pump satisfies including: Measuring the dust density of the dust in the bin pump multiple times.

5. The test method according to claim 1, characterized in that, The preset time is 1 h to 2 h.

6. A test system, characterized in that, Comprising: A fixing plate, which is arranged on the bin pump; A detector, which is the detector according to any one of claims 1-5, and the detector is arranged on the fixing plate; A data acquisition board, which is electrically connected to the detector; A computer, which is electrically connected to the data acquisition board.

7. The test system according to claim 6, wherein Further comprising: An amplifier, which is electrically connected between the detector and the data acquisition board.

8. The test system according to claim 6, characterized in that, At least one of the detectors is arranged on each of the bin pumps.

9. The testing system according to claim 6, wherein The fixing plate is located in the upper middle part of the bin pump, and the detector is parallel to the horizontal plane.

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