A method, apparatus, and electronic equipment for calculating the operating point of a slurry circulation pump.

Abstract

This invention discloses a method, apparatus, and electronic equipment for calculating the operating point of a slurry circulation pump. The method includes: acquiring the attribute information and operating data of the slurry circulation pump, the first relative density of limestone solids, and the second relative density of the limestone slurry to be transported; calculating the hydraulic performance of the slurry when the slurry circulation pump transports limestone slurry based on the attribute information, operating data, first relative density, and second relative density; acquiring the particle size of all particles in the limestone slurry and the volume percentage and weight percentage concentration of the limestone slurry; calculating the pipeline characteristics of the slurry circulation pump based on the particle size, volume percentage concentration, and weight percentage concentration; and calculating the operating point based on the hydraulic performance of the slurry and pipeline characteristics corresponding to the slurry circulation pump transporting different flow rates of clean water. This invention, through indirect calculation, effectively overcomes the limitation of existing technologies that cannot perform on-site measurements and are difficult to determine the true operating point, providing strong data support for subsequent energy-saving renovations.

Description

Technical Field

[0001] This invention relates to the field of thermal power plant desulfurization technology, specifically to a method, apparatus, and electronic equipment for calculating the operating point of a slurry circulation pump. Background Technology

[0002] The energy-saving and consumption-reduction effects of desulfurization in thermal power plants are directly related to environmental issues. The limestone-gypsum wet flue gas desulfurization process has advantages such as readily available absorbent solvents, high desulfurization efficiency, and the ability to recycle desulfurization byproducts, making it widely used in coal-fired power plants with a high proportion of engineering applications. The desulfurization system consumes a significant portion of the plant's total power consumption, making it a high-power-consuming system in coal-fired power plants, and its electricity costs account for a large portion of the total operating cost of the desulfurization system. The slurry pumps in the desulfurization system have high drive power, consuming approximately 50% of the system's electricity, making them a significant electricity consumer within the power plant. To achieve clean and efficient power generation, it is necessary to reduce the plant's power consumption rate of the desulfurization system. Reducing the plant's power consumption rate not only improves the economic efficiency of the desulfurization system's operation but also lowers power generation costs, which is of great significance for the long-term development of thermal power plants.

[0003] As a major power consumer in the desulfurization system, the slurry circulation pump's main function is to provide power for the recirculation of limestone slurry in the absorption tower. However, since the limestone slurry it transports is a non-Newtonian fluid with complex physical properties, and given the limitations of current technology, it is impossible to directly measure the flow rate of the slurry circulation pump on-site, understand its operating conditions, or determine its actual operating point. Consequently, it is impossible to formulate further energy-saving retrofit measures for the slurry circulation pump system. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a method for calculating the operating point of a slurry circulation pump, in order to solve the problem that the prior art cannot understand the on-site working performance requirements of the slurry circulation pump and is difficult to determine the actual operating point.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a method for calculating the operating point of a slurry circulation pump, including:

[0007] The property information and operating data of the slurry circulation pump, the first relative density of the limestone solid, and the second relative density of the limestone slurry to be transported are obtained. The operating data is the measurement data of the slurry circulation pump when transporting clean water.

[0008] Based on the attribute information and operating data, the first relative density of limestone solid and the second relative density of limestone slurry to be transported, the hydraulic performance of the slurry when the slurry circulation pump transports limestone slurry is calculated.

[0009] Obtain the particle size of all particles in the limestone slurry and the volume percentage and weight percentage concentration of the limestone slurry;

[0010] The pipeline characteristics of the slurry circulation pump are calculated based on the particle size, volume percentage concentration, and weight percentage concentration.

[0011] The operating point of the slurry circulation pump is calculated based on the hydraulic performance of the slurry and the pipeline characteristics corresponding to the different flow rates of clean water.

[0012] Optionally, the calculation of the operating point of the slurry circulation pump based on the hydraulic performance of the slurry and the pipeline characteristics corresponding to the pumping of clean water at different flow rates includes:

[0013] Based on the hydraulic performance of the slurry and the pipeline characteristics of the slurry circulation pump when delivering clean water at different flow rates, hydraulic performance curves and pipeline characteristic curves are plotted in the same coordinate system.

[0014] The intersection of the hydraulic performance curve and the pipeline characteristic curve is taken as the operating point of the slurry circulation pump.

[0015] Optionally, the step of calculating the hydraulic performance of the limestone slurry when the slurry circulation pump delivers the limestone slurry based on the attribute information and operating data, the first relative density of the limestone solid, and the second relative density of the limestone slurry to be transported includes:

[0016] Based on the operating data and the attribute information, the hydraulic performance of the slurry circulation pump when conveying clean water is calculated. The hydraulic performance of clean water includes: first head, first efficiency and first shaft power.

[0017] The head ratio and efficiency ratio of the limestone slurry circulation pump are calculated based on the hydraulic properties of the clear water, the first relative density, and the second relative density.

[0018] The hydraulic performance of the slurry circulation pump when transporting limestone slurry is calculated based on the aforementioned clear water hydraulic performance, head ratio, and efficiency ratio. The slurry hydraulic performance includes: second head, second efficiency, and second shaft power.

[0019] Optionally, calculating the hydraulic performance of the slurry circulation pump when conveying clean water based on the operating data and the attribute information includes:

[0020] Obtain the average density of the clean water medium inside the slurry circulation pump;

[0021] Extract the pipe diameter data of the slurry circulation pump from the attribute information, and extract the flow rate data, pressure data, distance data, motor power and motor efficiency from the operating data;

[0022] The first head of the slurry circulation pump when transporting clean water is calculated based on the pipe diameter data, flow rate data, pressure data, distance data, and average density.

[0023] Multiplying the motor power by the motor efficiency yields the first shaft power of the slurry circulation pump when transporting clean water.

[0024] The first efficiency of the slurry circulation pump when transporting clean water is calculated based on the average density, flow rate data, first shaft power, and first head.

[0025] Optionally, the step of calculating the hydraulic performance of the slurry when the slurry circulation pump is conveying limestone slurry based on the hydraulic performance of the clear water, the head ratio, and the efficiency ratio includes:

[0026] The second head is calculated based on the first head and the head ratio;

[0027] The second efficiency is calculated based on the first efficiency and the efficiency ratio.

[0028] The second shaft power is calculated based on the second efficiency, the second head, and the weight of the slurry.

[0029] Optionally, the step of calculating the pipeline characteristics of the slurry circulation pump based on the particle size, volume percentage concentration, and weight percentage concentration includes:

[0030] The type of limestone slurry is determined based on the particle size, volume percentage concentration, weight percentage concentration, and a preset threshold. The slurry type includes homogeneous slurry and typical slurry.

[0031] Calculate the head and flow rate of the slurry circulation pump based on the slurry type;

[0032] The pipeline characteristics of the slurry circulation pump are calculated using the head and flow rate.

[0033] Optionally, the calculation of the pipeline characteristics of the slurry circulation pump using the head and the flow rate includes:

[0034] When the slurry type is homogeneous slurry, the attribute data of the slurry circulation pump and the first flow rate and first head when the conveying medium is clean water are obtained; the static head of the slurry circulation pump is calculated based on the attribute data, and the static head is the head when the flow rate of the slurry circulation pump is 0; the first pipeline characteristic between the flow rate and the head is calculated through the static head, the first head and the first flow rate.

[0035] When the slurry type is a typical slurry, the static head of the slurry circulation pump when conveying homogeneous slurry, the pipe diameter of the slurry circulation pump, the first relative density of limestone solids, and the second relative density of limestone slurry are obtained; the critical settling velocity is calculated based on the pipe diameter, volume percentage concentration, first relative density, and second relative density; the second head and second flow rate of the slurry circulation pump at different speeds are calculated based on the static head and the critical settling velocity; and the second pipeline characteristic between flow rate and head is calculated based on the second head and second flow rate of the slurry circulation pump at different speeds.

[0036] This invention also provides a device for calculating the operating point of a slurry circulation pump, comprising:

[0037] The first acquisition module is used to acquire the attribute information and operating data of the slurry circulation pump, the first relative density of limestone solid, and the second relative density of the limestone slurry to be transported. The operating data is the measurement data of the slurry circulation pump when transporting clean water.

[0038] The first calculation module is used to calculate the hydraulic performance of the slurry circulation pump when transporting limestone slurry based on the attribute information and operating data, the first relative density of limestone solid and the second relative density of limestone slurry to be transported.

[0039] The second acquisition module is used to acquire the particle size of all particles in the limestone slurry and the volume percentage concentration and weight percentage concentration of the limestone slurry.

[0040] The second calculation module is used to calculate the pipeline characteristics of the slurry circulation pump based on the particle size, volume percentage concentration, and weight percentage concentration.

[0041] The third calculation module is used to calculate the operating point of the slurry circulation pump based on the hydraulic performance of the slurry and the pipeline characteristics corresponding to the slurry hydraulic performance when the slurry circulation pump delivers clean water at different flow rates.

[0042] This invention also provides an electronic device, comprising:

[0043] The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes these computer instructions to perform the slurry circulation pump operating point calculation method provided in this embodiment of the invention.

[0044] This invention also provides a computer-readable storage medium storing computer instructions for causing a computer to execute the slurry circulation pump operating point calculation method provided in this invention.

[0045] The technical solution of this invention has the following advantages:

[0046] This invention provides a method for calculating the operating point of a slurry circulation pump. It involves acquiring the pump's attribute information and operating data, the first relative density of limestone solids, and the second relative density of the limestone slurry to be transported. The operating data refers to measurements taken when the pump is transporting clean water. Based on the attribute information, operating data, the first relative density of limestone solids, and the second relative density of the limestone slurry, the hydraulic performance of the slurry when transporting limestone slurry is calculated. The method also involves acquiring the particle size of all particles in the limestone slurry and the volume percentage and weight percentage concentration of the limestone slurry. The pipeline characteristics of the slurry circulation pump are calculated based on the particle size, volume percentage concentration, and weight percentage concentration. Finally, the operating point of the slurry circulation pump is calculated based on the hydraulic performance of the slurry and the pipeline characteristics corresponding to different flow rates of clean water. This invention, through indirect calculation, effectively overcomes the limitations of existing technologies that cannot perform on-site measurements to determine the true operating point, providing strong data support for subsequent energy-saving retrofits. Attached Figure Description

[0047] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0048] Figure 1 This is a flowchart of the method for calculating the operating point of the slurry circulation pump in an embodiment of the present invention;

[0049] Figure 2 This is a flowchart illustrating the calculation of the hydraulic performance of limestone slurry when transported by a slurry circulation pump according to an embodiment of the present invention.

[0050] Figure 3 This is a flowchart illustrating the calculation of the hydraulic performance of a slurry circulation pump when delivering clean water, according to an embodiment of the present invention.

[0051] Figure 4 This is a flowchart for calculating the hydraulic properties of slurry according to an embodiment of the present invention;

[0052] Figure 5 This is a flowchart illustrating the calculation of the pipeline characteristics of the slurry circulation pump according to an embodiment of the present invention;

[0053] Figure 6 This is a flowchart illustrating the calculation of pipeline characteristics for different slurries according to an embodiment of the present invention;

[0054] Figure 7 This is a flowchart illustrating the calculation of the operating point of the slurry circulation pump according to an embodiment of the present invention;

[0055] Figure 8 This is a schematic diagram of the operating point calculation device of the slurry circulation pump in an embodiment of the present invention;

[0056] Figure 9 This is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] According to an embodiment of the present invention, an embodiment of a method for calculating the operating point of a slurry circulation pump is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0059] This embodiment provides a method for calculating the operating point of a slurry circulation pump, which can be used in the aforementioned terminal equipment, such as a computer, etc. Figure 1 As shown, the method for calculating the operating point of the slurry circulation pump includes the following steps:

[0060] Step S1: Obtain the attribute information and operating data of the slurry circulation pump, the first relative density of the limestone solid, and the second relative density of the limestone slurry to be transported. The operating data refers to the measurement data of the slurry circulation pump when transporting clean water. Specifically, when obtaining the operating data, the transport medium of the slurry circulation pump is changed from limestone slurry to clean water, the pump is started and runs normally, and the measurement is performed after the operating conditions of the slurry circulation pump stabilize.

[0061] Step S2: Based on the attribute information and operational data, the first relative density of the limestone solid, and the second relative density of the limestone slurry to be transported, the hydraulic performance of the limestone slurry transported by the slurry circulation pump is calculated. Specifically, through indirect calculation, the hydraulic performance of the limestone slurry transported by the slurry circulation pump can be conveniently understood on-site, overcoming the drawback of existing technologies where the flow rate during the operation of the slurry circulation pump cannot be directly measured, thus preventing the understanding of its hydraulic performance. This also provides data support for the calculation work point.

[0062] Step S3: Obtain the particle size of all particles in the limestone slurry and the volume percentage and weight percentage concentration of the limestone slurry. Specifically,

[0063] Step S4: Calculate the pipeline characteristics of the slurry circulation pump based on particle size, volume percentage concentration, and weight percentage concentration. Specifically, the volume percentage concentration C... v C is the percentage of solid volume to slurry volume flowing per unit time; weight percentage concentration C. w It is the percentage of the weight of solids flowing per unit time to the weight of slurry.

[0064] Step S5: Calculate the operating point of the slurry circulation pump based on the hydraulic performance of the slurry and the pipeline characteristics corresponding to the pump delivering different flow rates of clean water. Specifically, through indirect calculation, this effectively overcomes the limitation of existing technologies that cannot perform on-site measurements and thus cannot determine the true operating point, providing strong data support for subsequent energy-saving retrofits.

[0065] Through the above steps S1 to S4, the method for calculating the operating point of a slurry circulation pump provided in this embodiment of the invention can effectively solve the problem that the existing technology cannot understand the on-site working performance of the slurry circulation pump and is difficult to determine the actual operating point by means of indirect calculation, thus providing strong data support for subsequent energy-saving renovation.

[0066] Specifically, in one embodiment, step S2 described above is as follows: Figure 2 As shown, the specific steps include the following:

[0067] Step S21: Calculate the hydraulic performance of the slurry circulation pump when conveying clean water based on operating data and attribute information. The hydraulic performance includes: first head, first efficiency, and first shaft power. Specifically, by calculating the hydraulic performance of the slurry circulation pump when conveying clean water, data support is provided for the subsequent indirect calculation of the hydraulic performance of the slurry circulation pump when conveying limestone slurry.

[0068] Step S22: Calculate the head ratio and efficiency ratio of the slurry circulation pump for transporting limestone slurry using the hydraulic properties of clear water, the first relative density, and the second relative density. Specifically, obtain the volume of limestone solids and limestone slurry transported by the slurry circulation pump per unit time. The volume of limestone solids is Q. s The volume of the limestone slurry is Q. m The weight of solids and the weight of slurry transported by the slurry circulation pump per unit time are calculated based on the first relative density, the second relative density, and the volume. The first relative density S of limestone solids is the ratio of the density of limestone solids to the density of water.

[0069]

[0070] The second relative density S of limestone slurry m This refers to the ratio of the density of limestone slurry to the density of water.

[0071]

[0072] In the formula, ρm is the density of the limestone slurry, that is, the mass per unit volume;

[0073] The weight of the solid can be obtained through conventional weight calculations: SQ s The weight of the slurry is S. m Q m .

[0074] The weight percentage concentration of limestone slurry is calculated by combining the solid weight and the slurry weight. Specifically, the weight percentage concentration C of the limestone slurry can be calculated using the following formula. w It is the percentage of the weight of solids flowing per unit time to the weight of slurry.

[0075]

[0076] The head ratio and efficiency ratio of the slurry circulation pump for conveying limestone slurry and clean water are calculated based on the first relative density, the preset median particle size, and the weight percentage concentration. Specifically, the head ratio H for conveying limestone slurry can be calculated using the formula. R Efficiency ratio E R .

[0077]

[0078] In the formula: H R For the same flow rate and rotational speed, the head (H) of the slurry circulation pump delivering limestone slurry is... m The ratio of the head (H) when conveying clean water;

[0079] ER is the efficiency (η) of a slurry circulation pump in transporting limestone slurry at the same flow rate and rotational speed. m The ratio of H to the efficiency (η) when conveying clean water. Generally, when conveying typical slurries, H... R =E R ;

[0080] d 50 The median particle size refers to the particle size of 50% of the total weight of particles during sample sieving. It ensures that the weight share of particles larger than this particle size is the same as that of particles smaller than this particle size, in mm or μm.

[0081] By calculating the head ratio and efficiency ratio, the relationship between transporting limestone slurry and clean water under the same flow rate and speed conditions can be clearly understood. Based on the above relationship, the hydraulic performance of the slurry circulation pump in transporting limestone slurry can be indirectly calculated without measuring the flow rate of the slurry circulation pump during operation.

[0082] Step S23: Calculate the hydraulic performance of the limestone slurry when the slurry circulation pump is transporting limestone slurry based on the clear water hydraulic performance, head ratio, and efficiency ratio. The slurry hydraulic performance includes: second head, second efficiency, and second shaft power. Specifically, through indirect calculation, the hydraulic performance of the limestone slurry transported by the slurry circulation pump can be conveniently understood on-site, overcoming the drawback of existing technologies where the flow rate during slurry circulation pump operation cannot be directly measured, thus preventing the understanding of its hydraulic performance and providing data support for the calculation work point.

[0083] Specifically, in one embodiment, the step S1 described above, which involves obtaining the operating data of the slurry circulation pump, includes the following:

[0084] At the same rotational speed, the outlet opening of the slurry circulation pump was adjusted to obtain different operating data for the pump when delivering different flow rates of clean water. Operating data was then extracted from these different operating data. Specifically, by adjusting the outlet opening of the slurry circulation pump, operating data for delivering clean water at different flow rates under the same rotational speed can be obtained, providing data for subsequent indirect calculations of limestone slurry under various conditions.

[0085] Specifically, in one embodiment, step S21 described above is as follows: Figure 3 As shown, the specific steps include the following:

[0086] Step S211: Obtain the average density of the clean water medium inside the slurry circulation pump.

[0087] Step S212: Extract the pipe diameter data of the slurry circulation pump from the attribute information, and extract the flow rate data, pressure data, distance data, motor power, and motor efficiency from the operating data. Specifically,

[0088] Step S213: Calculate the first head of the slurry circulation pump when conveying clean water based on pipe diameter data, flow rate data, pressure data, distance data, and average density. Specifically, the operating data includes: flow rate Q, inlet pressure P1, outlet pressure P2, vertical distance z2 from the center of the pump outlet pressure gauge to the reference plane, vertical distance z1 from the center of the pump inlet pressure gauge to the reference plane, and motor power P when the conveying medium is clean water. mot Electric motor efficiency η motThe motor efficiency can be obtained from the motor's technical specifications; the attribute information includes: the inlet pipe diameter D1 and the outlet pipe diameter D2 of the slurry circulation pump.

[0089] Step S214: Multiply the motor power by the motor efficiency to obtain the first shaft power of the slurry circulation pump when conveying clean water. Specifically, the inlet pipe velocity v1 and outlet pipe velocity v2 of the slurry circulation pump can be calculated according to the following formulas:

[0090]

[0091] The first head H of the slurry circulation pump in clean water medium can be calculated using the following formula:

[0092]

[0093] Step S215: Calculate the first efficiency of the slurry circulation pump when conveying clean water based on average density, flow rate data, first shaft power, and first head. Specifically, the shaft power P of the slurry circulation pump under clean water medium can be calculated according to the following formula. s ;

[0094] P s =P mot η mot

[0095] The effective power of the slurry circulation pump when conveying clean water is calculated using average density, flow rate data, and the first head. Specifically, the effective power P of the slurry circulation pump in clean water medium is calculated according to the following formula. u ;

[0096] P u =ρgHQ

[0097] The ratio of effective power to first shaft power is taken as the first efficiency. Specifically, according to the formula, the first efficiency η of the slurry circulation pump in clean water medium can be calculated:

[0098]

[0099] By calculating the hydraulic performance of the slurry circulation pump when transporting clean water, more accurate data support is provided for the subsequent indirect calculation of the hydraulic performance of the slurry circulation pump when transporting limestone slurry. This method has high reliability. At the same time, by calculating the effective power and then the first efficiency through the data, the efficiency of the slurry circulation pump when transporting clean water can be accurately understood, and the working performance of the slurry circulation pump can be understood.

[0100] Specifically, in one embodiment, step S23 described above is as follows: Figure 4 As shown, the specific steps include the following:

[0101] Step S231: Calculate the second head based on the first head and the head ratio. Specifically, the second head H of the slurry circulation pump delivering limestone slurry under the same flow rate and speed conditions can be calculated using the following formula. m :

[0102] H m =H R H.

[0103] Step S232: Calculate the second efficiency based on the first efficiency and the efficiency ratio. Specifically, the second efficiency η of the slurry circulation pump transporting limestone slurry under the same flow rate and speed conditions can be calculated using the following formula. m .

[0104] η m =E R η.

[0105] Step S233: Calculate the second shaft power based on the second efficiency, second head, and slurry weight. Specifically, the second shaft power P of the slurry circulation pump when delivering slurry under the same flow rate and speed conditions can be calculated using the following formula. m .

[0106]

[0107] By using indirect calculations, the hydraulic performance of limestone slurry transported by the slurry circulation pump can be conveniently understood on-site, overcoming the drawback of existing technologies that cannot directly measure the flow rate of the slurry circulation pump during operation, thus making it impossible to understand its hydraulic performance.

[0108] Specifically, in one embodiment, step S4 described above is as follows: Figure 5 As shown, the specific steps include the following:

[0109] Step S41: Determine the type of limestone slurry based on particle size, volume percentage concentration, weight percentage concentration, and a preset threshold. Slurry types include homogeneous slurry and typical slurry. Specifically, to determine the type of limestone slurry, if the particle size of all particles in the limestone slurry is less than 100 μm, the weight percentage concentration C... w ≤30%, volume percentage concentration C v ≤15%, the limestone slurry is a homogeneous slurry; if the median particle size d of the slurry is... 50 Between 100 μm and 300 μm, the weight percentage concentration C w ≤40%, volume percentage concentration C v ≤20%, this limestone slurry is a typical slurry.

[0110] Step S42: Calculate the head and flow rate of the slurry circulation pump based on the slurry type. Specifically, by calculating the head and flow rate for different slurry types separately, the differences in the transportation process of different types of slurry are fully considered, providing more accurate and powerful data support for subsequent calculations of pipeline characteristics.

[0111] Step S43: Calculate the pipeline characteristics of the slurry circulation pump using head and flow rate. Specifically, the pipeline characteristics are calculated separately for two types of slurry, based on available data without on-site measurements. By classifying the slurry types and then comprehensively considering various factors for different slurry types, the pipeline characteristics of the slurry circulation pump can be directly calculated based on existing data without on-site measurements. This not only breaks through the limitations of existing technology but also provides strong data support for subsequent energy-saving retrofits.

[0112] Specifically, in one embodiment, step S43 described above is as follows: Figure 6 As shown, the specific steps include the following:

[0113] Step S431: When the slurry type is homogeneous slurry, obtain the attribute data of the slurry circulation pump and the first flow rate and first head when the conveying medium is clean water; calculate the static head of the slurry circulation pump based on the attribute data, where the static head is the head when the flow rate of the slurry circulation pump is 0; calculate the first pipeline characteristic between the flow rate and the head using the static head, the first head, and the first flow rate. Specifically, the first flow rate Q1 and the first head H1 of the pump when the conveying medium of the slurry circulation pump is clean water can be directly obtained through measurement. The process of calculating the static head of the slurry circulation pump includes: extracting the static pressure data and liquid height data of the container liquid surface from the attribute data. The static pressure data includes the static pressure of the slurry circulation pump sucking into the container liquid surface and the static pressure of the slurry circulation pump outputting from the container liquid surface. The liquid height data is the total geometric height of the liquid being lifted.

[0114] The static head H is calculated using the following formula. st :

[0115]

[0116] In the formula, P A The static pressure of the liquid surface in the slurry circulation pump suction container; P B The static pressure of the liquid level in the slurry circulation pump output container; H t ρ is the total geometric height to which the liquid is lifted; ρ is the density of pure water; g is the acceleration due to gravity.

[0117] Put the point (0, H) st Substituting (Q1, H1) into the following formula, the pipeline characteristics of the slurry circulation pump can be obtained:

[0118]

[0119] In the formula, Q is the flow rate of the slurry circulation pump; H c The head of the device is the total head required by the pipeline system to transport liquid; Ψ is a constant.

[0120] Specifically, when the slurry is homogeneous, the pipeline characteristic curve of the slurry circulation pump is obtained by measuring the pipeline parameters when the conveying medium is clean water, rather than directly measuring the relevant parameters of the pipeline when conveying limestone slurry. This effectively solves the problem that existing technologies cannot directly measure and calculate on-site due to limited technical conditions.

[0121] Step S432: When the slurry type is a typical slurry, obtain the static head of the slurry circulation pump when delivering homogeneous slurry, the pipe diameter of the slurry circulation pump, the first relative density of limestone solids, and the second relative density of limestone slurry; calculate the critical settling velocity based on the pipe diameter, volume percentage concentration, first relative density, and second relative density; calculate the second head and second flow rate of the slurry circulation pump at different speeds based on the static head and critical settling velocity; calculate the second pipeline characteristics between flow rate and head based on the second head and second flow rate of the slurry circulation pump at different speeds. Specifically, compare the pipe diameter with a preset pipe diameter value; when the pipe diameter is smaller than the preset pipe diameter value, calculate the critical settling velocity V using the following formula. L : When the pipe diameter D ≤ 200 mm, the critical settlement velocity can be calculated using this formula, where S L The relative density of the carrier is given. The carrier consists of a liquid and solid particles with a diameter of less than 100 μm and can be obtained directly.

[0122] When the pipe diameter is larger than the preset pipe diameter value, the critical settlement velocity V is calculated using the following formula. L :

[0123] When the pipe diameter D > 200 mm, the critical settlement velocity can be calculated using this formula, where d 50 The median particle size refers to the particle size of the 50% of particles by weight during sample sieving, ensuring that particles larger than this size and particles smaller than this size have an equal weight share; D is the pipe diameter; g is the acceleration due to gravity; F L C is a coefficient related to particle size and concentration. V S is the volume percentage concentration; S is the first relative density; S L This is the second relative density.

[0124] Specifically, since the critical settling velocity is affected by the friction of solid particles in the slurry and the siltation velocity, different pipe diameters will have a significant impact on the critical settling velocity. By distinguishing between different pipe diameters and performing different calculations, the accuracy of the calculated critical settling velocity can be effectively guaranteed, ensuring that the calculated critical settling velocity can guarantee the normal flow of the slurry in the pipe.

[0125] The first pipeline characteristics between flow rate and head are calculated by static head, first head, and first flow rate; the second head of the slurry circulation pump at different speeds is calculated based on the first pipeline characteristics and critical settling velocity; and the second flow rate corresponding to the second head is calculated according to the preset velocity corresponding value of pipeline head loss.

[0126] Pipeline characteristics when using slurry circulation pump with clean water as the medium The flow velocity v = V can be calculated. L The device head H at that time L1 Calculate v = 1.3V L The device head H at that time L2 ;

[0127] According to the formula Calculate v = 0.7V L Traffic Q 0.7VL v = 1.3V L Traffic Q 1.3VL , where A is the cross-sectional area of ​​the pipeline.

[0128] Specifically, the head loss in pipelines for typical slurries has the following characteristics: Under the same pipeline conditions, when the slurry velocity is 0.7 times its critical velocity (v = 0.7V), the head loss increases significantly. L When the head loss of the slurry is equal to the head loss of the clear water at the critical settling velocity of the slurry (v = V), the head loss of the slurry is equal to the head loss of the clear water at the critical settling velocity of the slurry (v = V). L The head loss is the same during flow; when the flow velocity of the slurry is 1.3 times its critical settling velocity (v = 1.3V), the head loss is the same. L When the slurry flows at the same velocity, the head loss is the same as that of clean water. Based on this characteristic, the second head and second flow rate of the slurry circulation pump at different velocities can be calculated, providing data support for calculating the pipeline characteristics of the slurry circulation pump when transporting typical slurries.

[0129] Put point (Q) 0.7VL H L1 ), (Q 1.3VL H L2 Substitute into the formula The pipeline characteristics of the slurry circulation pump when transporting typical slurries are determined, where Ψ is a constant for a specific pipeline, and its value varies depending on the pipeline model. When the slurry is a typical slurry, the pipeline characteristics of the slurry circulation pump are obtained by measuring the pipeline characteristics when the transport medium is clean water and combining this with the characteristics of the pipeline head loss when transporting slurry, rather than directly measuring the relevant parameters of the pipeline when transporting limestone slurry. This effectively solves the problem in existing technologies where direct on-site measurement and calculation are not possible due to limited technical conditions.

[0130] Specifically, in one embodiment, step S5 described above is as follows: Figure 7 As shown, the specific steps include the following:

[0131] Step S51: Based on the hydraulic performance of the slurry and the pipeline characteristics corresponding to the slurry circulation pump when conveying clean water at different flow rates, plot the hydraulic performance curve and the pipeline characteristic curve in the same coordinate system.

[0132] Step S52: The intersection of the hydraulic performance curve and the pipeline characteristic curve is taken as the operating point of the slurry circulation pump. Specifically, if the medium transported by the slurry pump is a homogeneous slurry, the Q value when the slurry pump is transporting homogeneous limestone slurry is taken as the operating point. m -H m The characteristic curves of the slurry circulation pump and the pipeline characteristic curve for conveying homogeneous slurry are plotted on the same graph at the same scale. The intersection of the two curves is the operating point of the slurry pump when conveying homogeneous limestone slurry. When the slurry is homogeneous, there is a certain relationship between the operating point of the slurry circulation pump and the operating point of the slurry circulation pump when conveying clean water. The operating point of the slurry circulation pump when conveying homogeneous slurry is indirectly obtained by calculating the hydraulic performance and pipeline characteristics of the slurry circulation pump when conveying clean water, and combining this relationship, rather than directly measuring and calculating the pipeline characteristic curve when conveying homogeneous limestone slurry.

[0133] If the medium transported by the slurry pump is a typical slurry, plot the Qm-Hm characteristic curve of the slurry pump when transporting typical limestone slurry and the pipeline characteristic curve of the slurry circulation pump when transporting typical slurry on the same graph at the same scale. The intersection of the two curves is the operating point of the slurry pump when transporting typical limestone slurry. When the slurry is a typical slurry, there is a certain relationship between the operating point of the slurry circulation pump and the operating point of the slurry circulation pump when transporting clean water. The operating point of the slurry circulation pump when transporting typical slurry can be indirectly obtained by calculating the hydraulic performance and pipeline characteristics of the slurry circulation pump when transporting clean water, and combining this relationship, rather than directly measuring and calculating the pipeline characteristic curve when transporting typical limestone slurry.

[0134] The method provided in this embodiment, through indirect acquisition, can effectively solve the problem that existing technologies cannot understand the on-site working performance of slurry circulation pumps and are difficult to determine the actual operating point, thus providing strong data support for subsequent energy-saving renovations.

[0135] This embodiment also provides a slurry circulation pump operating point calculation device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0136] This embodiment provides a device for calculating the operating point of a slurry circulation pump, such as... Figure 8 As shown, it includes:

[0137] The first acquisition module 101 is used to acquire the attribute information and operating data of the slurry circulation pump, the first relative density of the limestone solid, and the second relative density of the limestone slurry to be transported. The operating data is the measurement data of the slurry circulation pump when transporting clean water. For details, please refer to the relevant description of step S1 in the above method embodiment, which will not be repeated here.

[0138] The first calculation module 102 is used to calculate the hydraulic performance of the slurry circulation pump when transporting limestone slurry based on attribute information, operating data, the first relative density of limestone solid, and the second relative density of limestone slurry to be transported. For details, please refer to the relevant description of step S2 in the above method embodiment, which will not be repeated here.

[0139] The second acquisition module 103 is used to acquire the particle size of all particles in the limestone slurry and the volume percentage concentration and weight percentage concentration of the limestone slurry. For details, please refer to the relevant description of step S3 in the above method embodiment, which will not be repeated here.

[0140] The second calculation module 104 is used to calculate the pipeline characteristics of the slurry circulation pump based on the particle size, volume percentage concentration, and weight percentage concentration. For details, please refer to the relevant description of step S4 in the above method embodiment, which will not be repeated here.

[0141] The third calculation module 105 is used to calculate the operating point of the slurry circulation pump based on the hydraulic performance of the slurry and the characteristics of the pipeline when the slurry circulation pump is delivering clean water at different flow rates. For details, please refer to the relevant description of step S5 in the above method embodiment, which will not be repeated here.

[0142] In this embodiment, the operating point calculation device of the slurry circulation pump is presented in the form of a functional unit. Here, a unit refers to an ASIC circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0143] Further functional descriptions of the above modules are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0144] According to embodiments of the present invention, an electronic device is also provided, such as... Figure 9 As shown, the electronic device may include a processor 901 and a memory 902, wherein the processor 901 and the memory 902 may be connected via a bus or other means. Figure 9 Taking the example of a connection between China and Israel via a bus.

[0145] Processor 901 can be a Central Processing Unit (CPU). Processor 901 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0146] The memory 902, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the methods in the method embodiments of the present invention. The processor 901 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions, and modules stored in the memory 902, thereby implementing the methods in the above method embodiments.

[0147] The memory 902 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the processor 901, etc. Furthermore, the memory 902 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 902 may optionally include memory remotely located relative to the processor 901, and these remote memories may be connected to the processor 901 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0148] One or more modules are stored in memory 902, and when executed by processor 901, they perform the methods described in the above method embodiments.

[0149] The specific details of the aforementioned electronic device can be understood by referring to the relevant descriptions and effects in the above method embodiments, and will not be repeated here.

[0150] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the methods described above. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0151] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for calculating the operating point of a slurry circulation pump, characterized in that, include: The property information and operating data of the slurry circulation pump, the first relative density of the limestone solid, and the second relative density of the limestone slurry to be transported are obtained. The operating data is the measurement data of the slurry circulation pump when transporting clean water. Based on the attribute information and operating data, the first relative density of limestone solid and the second relative density of limestone slurry to be transported, the hydraulic performance of the slurry when the slurry circulation pump transports limestone slurry is calculated. Obtain the particle size of all particles in the limestone slurry and the volume percentage and weight percentage concentration of the limestone slurry; The pipeline characteristics of the slurry circulation pump are calculated based on the particle size, volume percentage concentration, and weight percentage concentration. The operating point of the slurry circulation pump is calculated based on the hydraulic performance of the slurry and the pipeline characteristics corresponding to the different flow rates of clean water.

2. The method for calculating the operating point of a slurry circulation pump according to claim 1, characterized in that, The calculation of the operating point of the slurry circulation pump based on the hydraulic performance of the slurry and pipeline characteristics corresponding to different flow rates of clean water includes: Based on the hydraulic performance of the slurry and the pipeline characteristics of the slurry circulation pump when delivering clean water at different flow rates, hydraulic performance curves and pipeline characteristic curves are plotted in the same coordinate system. The intersection of the hydraulic performance curve and the pipeline characteristic curve is taken as the operating point of the slurry circulation pump.

3. The method for calculating the operating point of a slurry circulation pump according to claim 1, characterized in that, The calculation of the hydraulic performance of the limestone slurry when the slurry circulation pump delivers the limestone slurry based on the attribute information, operating data, the first relative density of the limestone solid, and the second relative density of the limestone slurry to be transported includes: Based on the operating data and the attribute information, the hydraulic performance of the slurry circulation pump when conveying clean water is calculated. The hydraulic performance of clean water includes: first head, first efficiency and first shaft power. The head ratio and efficiency ratio of the limestone slurry circulation pump are calculated based on the hydraulic properties of the clear water, the first relative density, and the second relative density. The hydraulic performance of the slurry circulation pump when transporting limestone slurry is calculated based on the aforementioned clear water hydraulic performance, head ratio, and efficiency ratio. The slurry hydraulic performance includes: second head, second efficiency, and second shaft power.

4. The method for calculating the operating point of a slurry circulation pump according to claim 3, characterized in that, The calculation of the hydraulic performance of the slurry circulation pump when conveying clean water based on the operating data and the attribute information includes: Obtain the average density of the clean water medium inside the slurry circulation pump; Extract the pipe diameter data of the slurry circulation pump from the attribute information, and extract the flow rate data, pressure data, distance data, motor power and motor efficiency from the operating data; The first head of the slurry circulation pump when transporting clean water is calculated based on the pipe diameter data, flow rate data, pressure data, distance data, and average density. Multiplying the motor power by the motor efficiency yields the first shaft power of the slurry circulation pump when transporting clean water. The first efficiency of the slurry circulation pump when transporting clean water is calculated based on the average density, flow rate data, first shaft power, and first head.

5. The method for calculating the operating point of a slurry circulation pump according to claim 3, characterized in that, The calculation of the hydraulic performance of the slurry circulating pump when transporting limestone slurry based on the clear water hydraulic performance, head ratio, and efficiency ratio includes: The second head is calculated based on the first head and the head ratio; The second efficiency is calculated based on the first efficiency and the efficiency ratio. The second shaft power is calculated based on the second efficiency, the second head, and the weight of the slurry.

6. The method for calculating the operating point of a slurry circulation pump according to claim 1, characterized in that, The pipeline characteristics of the slurry circulation pump calculated based on the particle size, volume percentage concentration, and weight percentage concentration include: The type of limestone slurry is determined based on the particle size, volume percentage concentration, weight percentage concentration, and a preset threshold. The slurry type includes homogeneous slurry and typical slurry. Calculate the head and flow rate of the slurry circulation pump based on the slurry type; The pipeline characteristics of the slurry circulation pump are calculated using the head and flow rate.

7. The method for calculating the operating point of a slurry circulation pump according to claim 6, characterized in that, The calculation of the pipeline characteristics of the slurry circulation pump using the head and the flow rate includes: When the slurry type is homogeneous slurry, the attribute data of the slurry circulation pump and the first flow rate and first head when the conveying medium is clean water are obtained; the static head of the slurry circulation pump is calculated based on the attribute data, and the static head is the head when the flow rate of the slurry circulation pump is 0; the first pipeline characteristic between the flow rate and the head is calculated through the static head, the first head and the first flow rate. When the slurry type is a typical slurry, the static head of the slurry circulation pump when conveying homogeneous slurry, the pipe diameter of the slurry circulation pump, the first relative density of limestone solids, and the second relative density of limestone slurry are obtained; the critical settling velocity is calculated based on the pipe diameter, volume percentage concentration, first relative density, and second relative density; the second head and second flow rate of the slurry circulation pump at different speeds are calculated based on the static head and the critical settling velocity; and the second pipeline characteristic between flow rate and head is calculated based on the second head and second flow rate of the slurry circulation pump at different speeds.

8. A device for calculating the operating point of a slurry circulation pump, characterized in that, include: The first acquisition module is used to acquire the attribute information and operating data of the slurry circulation pump, the first relative density of limestone solid, and the second relative density of the limestone slurry to be transported. The operating data is the measurement data of the slurry circulation pump when transporting clean water. The first calculation module is used to calculate the hydraulic performance of the slurry circulation pump when transporting limestone slurry based on the attribute information and operating data, the first relative density of limestone solid and the second relative density of limestone slurry to be transported. The second acquisition module is used to acquire the particle size of all particles in the limestone slurry and the volume percentage concentration and weight percentage concentration of the limestone slurry. The second calculation module is used to calculate the pipeline characteristics of the slurry circulation pump based on the particle size, volume percentage concentration, and weight percentage concentration. The third calculation module is used to calculate the operating point of the slurry circulation pump based on the hydraulic performance of the slurry and the pipeline characteristics corresponding to the slurry hydraulic performance when the slurry circulation pump delivers clean water at different flow rates.

9. An electronic device, characterized in that, include: The system includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the method for calculating the operating point of the slurry circulation pump according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to execute the method for calculating the operating point of the slurry circulation pump according to any one of claims 1-7.

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