Intelligent peak regulation coal treatment system for thermal power generation

Abstract

The invention provides an intelligent peak regulation coal material treatment system for thermal power generation, and relates to the technical field of thermal power generation, the intelligent peak regulation coal material treatment system for thermal power generation comprises a crushing and screening device, a washing device, a drying device, a coal grinding device, a transmission device, an intelligent regulation and control device and an energy storage device; the crushing and screening equipment, the washing and selecting equipment, the drying equipment, the coal grinding equipment and the transmission equipment are used for processing coal and transmitting the coal to a boiler, the intelligent regulation and control equipment is used for controlling the operation states of the crushing and screening equipment, the washing and selecting equipment, the drying equipment, the coal grinding equipment and the transmission equipment by adopting a regulation and control algorithm according to power utilization wave peaks and power utilization wave troughs, and the energy storage equipment is used for storing power at the power utilization wave peaks; the system is energy-saving, can be matched with the load of a power grid, and reduces the power supply pressure of the power grid.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal power generation, and in particular to an intelligent peak-shaving coal material processing system for thermal power generation. Background Art

[0002] As an important component of power supply, thermal power generation occupies an important position worldwide. With the development of social economy and the improvement of people's living standards, the demand for electricity is growing, and the load of the power grid shows obvious peak-to-valley differences. Especially during peak hours, the power grid faces huge power supply pressure. In order to ensure the stable operation of the power system, effective measures need to be taken to deal with this load fluctuation.

[0003] Traditional thermal power plants often follow a fixed process when processing coal, regardless of the actual needs of the power grid. This approach may lead to insufficient equipment utilization when the power grid load is low, and may not be able to meet the needs of rapid response during peak loads due to limited processing capacity. Therefore, how to flexibly respond to changes in power grid load while ensuring power generation efficiency has become an urgent problem to be solved.

[0004] The existing coal handling system usually lacks the ability to match the real-time load of the power grid and cannot dynamically adjust the speed and amount of coal handling according to the changes in the power grid load. In addition, with the increasing awareness of environmental protection, reducing pollutant emissions has become another challenge facing thermal power plants. Traditional treatment methods are often accompanied by higher pollutant emissions and do not meet the requirements of sustainable development.

[0005] Therefore, we propose a coal handling system that is energy-saving, matches the grid load, and reduces the power supply pressure of the grid. Summary of the invention

[0006] The purpose of the present invention is to provide an intelligent peak-shaving coal processing system for thermal power generation, which not only has the advantage of energy saving, but also can match the power grid load and reduce the power supply pressure of the power grid.

[0007] The present invention is achieved through the following technical solutions:

[0008] An intelligent peak-shaving coal processing system for thermal power generation, comprising crushing and screening equipment, washing equipment, drying equipment, coal grinding equipment, transmission equipment, intelligent control equipment and energy storage equipment;

[0009] The crushing and screening equipment is used to crush the raw coal and screen out coal lumps of suitable size;

[0010] The washing equipment is used to clean the coal blocks by physical or chemical methods to remove some impurities;

[0011] The drying equipment is used to dry the cleaned coal blocks;

[0012] The coal grinding equipment is used to grind coal lumps into coal powder;

[0013] The transmission equipment is used to transmit the pulverized coal to the boiler for incineration and power generation;

[0014] The intelligent control device is used to control the operating status of the crushing and screening equipment, washing equipment, drying equipment, coal grinding equipment and transmission equipment by adopting a control algorithm according to the peak and valley of electricity consumption;

[0015] The energy storage device is used to store electricity during the electricity consumption trough period.

[0016] Furthermore, the control steps of the regulation algorithm include:

[0017] S1. Initialize system parameters;

[0018] S2. Collect power grid data in real time and calculate the ratio of current power consumption to average power consumption;

[0019] S3. Determine whether the current state is a peak or a trough according to the ratio and the preset peak threshold;

[0020] S4. When the power consumption of the power grid is at a trough state, the operating frequency of each device is increased, and energy storage equipment is used to store excess power;

[0021] S5. When the power consumption of the power grid is at a peak, reduce the operating frequency of each device and give priority to using stored power;

[0022] S6. Regularly monitor the impact of coal processing power on the power load of the power grid, and feed back the impact results to S4 and S5 to make corresponding adjustments to increase or decrease the operating frequency of each device.

[0023] Furthermore, the process of presetting the peak threshold and the trough threshold includes:

[0024] S31. Obtaining power grid electricity consumption data at various times over the years;

[0025] S32. Preprocessing the data;

[0026] S33. Calculate the average power consumption and standard deviation of each day in the historical data;

[0027] S34. According to the calculation results of S33, select the candidate time periods of the peak and trough;

[0028] S35. Calculate specific peak thresholds and trough thresholds according to candidate time periods of peaks and troughs.

[0029] Furthermore, the preprocessing method of S32 includes cleaning the data and smoothing the data using a moving average method.

[0030] Furthermore, the average power consumption calculation formula of S33 is:

[0031]

[0032] Where n is the number of time periods, P i is the electricity consumption in each time period;

[0033] The calculation formula of the standard deviation is:

[0034]

[0035] Furthermore, the calculation formula of the peak threshold is:

[0036] T peak =P avg +k 1 σ;

[0037] The calculation formula of the trough threshold is:

[0038] T valley =P avg -K 2 ·σ.

[0039] Furthermore, the peak threshold calculated in S35 is also used for correction according to real-time environmental data.

[0040] Furthermore, the correction formula of the peak threshold is:

[0041] T peak_correct =T peak +k 3 ·|T ambient -T ref |

[0042] Among them, T peak_correct is the corrected peak threshold, k 3 Indicates the degree of influence of each degree of temperature change on the peak threshold, |T ambient -T ref |Indicates the absolute difference between the current ambient temperature and the reference temperature.

[0043] Furthermore, the energy storage device includes a storage battery and a solar generator, wherein the storage battery is used to receive excess power from the power grid and power output by the solar generator.

[0044] Furthermore, the motors in the crushing and screening equipment, washing equipment, drying equipment, coal grinding equipment and transmission equipment adopt variable frequency drive motors.

[0045] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0046] The present invention dynamically adjusts the operating state of the coal handling system through intelligent control equipment during peak power consumption, reduces unnecessary power consumption, and achieves the effect of energy saving and emission reduction; and reduces the frequent start and stop of each device through intelligent control, which helps to reduce the generation of emissions and improve environmental quality;

[0047] The control algorithm can flexibly adjust the operating status of each device according to the actual situation of the power grid, so as to match the power grid load well and reduce the power supply pressure of the power grid; and because the operating status of the equipment is dynamically adjusted, it avoids long-term operation under high load conditions, which helps to extend the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0049] Figure 1 A schematic diagram of the structure of a coal processing system provided in Example 1 of the present invention;

[0050] Icons: 1. Crushing and screening equipment; 2. Washing equipment; 3. Drying equipment; 4. Coal grinding equipment; 5. Transmission equipment; 6. Intelligent control equipment; 7. Energy storage equipment. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0054] In the description of the present invention, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0055] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Example 1

[0057] Combined with Figure 1 An intelligent peak-shaving coal material processing system for thermal power generation, comprising a crushing and screening device 1, a washing and selecting device 2, a drying device 3, a coal grinding device 4, a transmission device 5, an intelligent control device 6 and an energy storage device 7;

[0058] The crushing and screening equipment 1 is used to crush the raw coal and screen out coal lumps of suitable size;

[0059] The washing equipment 2 is used to clean the coal blocks by physical or chemical methods to remove some impurities;

[0060] The drying device 3 is used to dry the cleaned coal blocks;

[0061] The coal grinding equipment 4 is used to grind coal blocks into coal powder;

[0062] The transmission device 5 is used to transmit the pulverized coal to the boiler for incineration and power generation;

[0063] The crushing and screening equipment 1, the washing equipment 2, the drying equipment 3, the coal grinding equipment 4 and the transmission equipment 5 constitute the processing of coal and the transmission to the boiler. Although the number of equipment involved in the processing process is relatively large, it can effectively remove impurities in the coal, so that the coal sent to the boiler for combustion and power generation can have a better combustion effect, which is conducive to improving the power generation efficiency; and the coal generated by the processing process is finer, and can also effectively reduce the harmful substances discharged by the coal in the process of combustion and power generation, so as to achieve the purpose of green energy saving;

[0064] The intelligent control device 6 is used to control the operating states of the crushing and screening equipment 1, the washing equipment 2, the drying equipment 3, the coal grinding equipment 4 and the transmission equipment 5 by using a control algorithm according to the peak and valley of electricity consumption;

[0065] The peak of electricity consumption means that the supply side demand of the power grid is large, so the power plant needs more coal to generate electricity, while the trough of electricity consumption means that the supply side demand of the power grid is small, and the power generation of the power plant will be partially redundant;

[0066] Therefore, the intelligent control device 6 is used to adjust the operating power of the crushing and screening equipment 1, the washing equipment 2, the drying equipment 3, the coal grinding equipment 4 and the transmission equipment 5 at the peak and valley stages of electricity consumption, that is, during the peak period of electricity consumption, the operating power of each device is reduced to reduce the load on the power grid, and during the valley period of electricity consumption, the operating power of each device is increased to produce and store part of the coal for consumption during the peak period of electricity consumption;

[0067] The energy storage device 7 is used to store electricity during the off-peak period, and can supply power to various devices during the peak period, thereby reducing the load on the power grid during the peak period;

[0068] In addition, the energy storage device 7 includes a storage battery and a solar generator, wherein the storage battery is used to receive excess power from the power grid and power output by the solar generator, thereby further reducing the power supply load of the power grid by increasing the dimension of input energy;

[0069] It should be noted that the motors in the crushing and screening equipment 1, washing equipment 2, drying equipment 3, coal grinding equipment 4 and transmission equipment 5 adopt variable frequency drive motors, so that the intelligent control device 6 can control the working state of each device by adjusting the working frequency of the motor in each device respectively, which has the advantages of convenient operation and accurate control.

[0070] Example 2

[0071] The control steps of the control algorithm include:

[0072] S1. Initialize system parameters, including but not limited to the maximum and minimum working capacity of the equipment, the peak and valley thresholds of power grid consumption, and set the working state variables of each device;

[0073] S2. Collect power grid data in real time and calculate the ratio of current power consumption to average power consumption:

[0074] Among them, the power consumption is set as P(t), and the ratio of the current power consumption to the average power consumption is

[0075] S3. Determine whether the current state is a peak or a trough according to the ratio and the preset peak threshold;

[0076] That is, if R(t)>T peak , it is considered to be in the peak state;

[0077] If R(t) <T valley , it is considered to be in the trough state;

[0078] Otherwise it is in a stable state;

[0079] S4. When the power consumption of the power grid is in a trough state, the operating frequency of each device is increased, and the energy storage device 7 is used to store excess power;

[0080] The operating frequency of each device is f i =f 0 (1+β), where β is the loading factor, f 0 is the rated frequency;

[0081] S5. When the power consumption of the power grid is at a peak, the operating frequency of each device is reduced, and the stored power is used first;

[0082] The operating frequency of each device is f i =f 0 (1+α), where α is the load shedding factor;

[0083] In addition, when the power grid is in a stable state, the equipment maintains the normal operating frequency, that is, f i =f 0 ;

[0084] S6. Regularly monitor the impact of coal processing power on the power load of the power grid, and feed back the impact results to S4 and S5 to make corresponding adjustments to increase or decrease the operating frequency of each device;

[0085] The adjustment process is as follows:

[0086] Record the working status of each device and the real-time power consumption of the power grid before and after each adjustment, analyze the changing trend of the power grid load after adjustment, and evaluate the control effect;

[0087] If it is found that the adjusted grid load is still close to the peak or trough threshold, it indicates that the current load increase or load reduction factor is insufficient to achieve the expected effect, and the value of α or β needs to be readjusted; for example: if the grid load is still low after increasing the operating frequency of the equipment during the trough period, the value of β can be further increased; conversely, if the grid load is still high after reducing the operating frequency of the equipment during the peak period, the value of α can be further increased;

[0088] Dynamically adjust the load increase or load reduction factor according to the changing trend of the power grid load to achieve the best control effect; if the power grid load tends to be stable, gradually restore the equipment to the normal working frequency f i .

[0089] In addition, the process of presetting the peak threshold and the trough threshold includes:

[0090] S31. Obtaining power grid electricity consumption data at various times over the years;

[0091] Based on historical data, it is possible to make a preliminary prediction of the peak and trough periods of power consumption in the power grid, which facilitates the subsequent calculation of specific peak or trough thresholds, thereby improving the efficiency of calculation;

[0092] S32. Preprocessing the data;

[0093] In particular, the preprocessing methods include cleaning the data and smoothing the data using the moving average method, which has the effect of removing outliers and reducing the impact of short-term fluctuations on the data;

[0094] S33. Calculate the average power consumption and standard deviation of each day in the historical data to measure the fluctuation of power consumption;

[0095] S34. According to the calculation results of S33, select the candidate time periods of the peak and trough;

[0096] S35. Calculate specific peak thresholds and trough thresholds according to candidate time periods of peaks and troughs.

[0097] In addition, the average power consumption calculation formula of S33 is:

[0098]

[0099] Where n is the number of time periods, P i is the electricity consumption in each time period;

[0100] The calculation formula of the standard deviation is:

[0101]

[0102] Furthermore, the calculation formula of the peak threshold is:

[0103] T peak =P davg +k 1 σ;

[0104] The calculation formula of the trough threshold is:

[0105] T valley =P davg -K 2 ·σ.

[0106] In addition, the peak threshold calculated in S35 is also used for correction according to real-time environmental data. Due to the large changes in the environment this year, the current environmental climate is often quite different from the climate in previous years. Therefore, the peak threshold obtained based on historical data can be corrected using real-time environmental climate data to obtain an accurate peak threshold.

[0107] Furthermore, the correction formula of the peak threshold is:

[0108] T peak_correct =T peak +k 3 ·|T ambient -T ref |

[0109] Among them, T peak_correct is the corrected peak threshold, k 3 Indicates the degree of influence of each degree of temperature change on the peak threshold, |T ambient -T ref |Indicates the absolute difference between the current ambient temperature and the reference temperature.

[0110] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent peak-shaving coal processing system for thermal power generation, characterized in that: It comprises crushing and screening equipment (1), washing equipment (2), drying equipment (3), coal grinding equipment (4), transmission equipment (5), intelligent control equipment (6) and energy storage equipment (7); The crushing and screening equipment (1) is used to crush the raw coal and screen out coal lumps of suitable size; The washing equipment (2) is used to clean the coal blocks by physical or chemical methods to remove some impurities; The drying device (3) is used to dry the cleaned coal blocks; The coal grinding equipment (4) is used to grind coal lumps into coal powder; The transmission device (5) is used to transmit the pulverized coal to the boiler for incineration and power generation; The intelligent control device (6) is used to control the operating states of the crushing and screening equipment (1), the washing equipment (2), the drying equipment (3), the coal grinding equipment (4) and the transmission equipment (5) by using a control algorithm according to the peak and valley of electricity consumption; The energy storage device (7) is used to store electricity during peak power consumption.

2. The intelligent peak-shaving coal processing system for thermal power generation according to claim 1, characterized in that: The control steps of the control algorithm include: S1. Initialize system parameters; S2. Collect power grid data in real time and calculate the ratio of current power consumption to average power consumption; S3. Determine whether the current state is at a peak or trough according to the ratio and the pre-set peak threshold and trough threshold; S4. When the power consumption of the power grid is in a trough state, the operating frequency of each device is increased, and the energy storage device (7) is used to store excess power; S5. When the power consumption of the power grid is at a peak, reduce the operating frequency of each device and give priority to using stored power; S6. Regularly monitor the impact of coal processing power on the power load of the power grid, and feed back the impact results to S4 and S5 to make corresponding adjustments to increase or decrease the operating frequency of each device.

3. The intelligent peak-shaving coal processing system for thermal power generation according to claim 2, characterized in that: The process of presetting the peak threshold and the trough threshold includes: S31. Obtaining power grid electricity consumption data at various times over the years; S32. Preprocessing the data; S33. Calculate the average power consumption and standard deviation of each day in the historical data; S34. According to the calculation results of S33, select the candidate time periods of the peak and trough; S35. Calculate specific peak thresholds and trough thresholds according to candidate time periods of peaks and troughs.

4. The intelligent peak-shaving coal processing system for thermal power generation according to claim 3, characterized in that: The preprocessing method of S32 includes cleaning the data and smoothing the data using a moving average method.

5. The intelligent peak-shaving coal processing system for thermal power generation according to claim 3, characterized in that: The average power consumption calculation formula of S33 is: Where n is the number of time periods, P i is the electricity consumption in each time period; The calculation formula of the standard deviation is:

6. The intelligent peak-shaving coal processing system for thermal power generation according to claim 3, characterized in that: The calculation formula of the peak threshold is: T peak =P davg +k1·s; The calculation formula of the trough threshold is: T valley =P davg -K2·s.

7. The intelligent peak-shaving coal processing system for thermal power generation according to claim 3, characterized in that: The peak threshold calculated in S35 is also used for correction according to real-time environmental data.

8. The intelligent peak-shaving coal processing system for thermal power generation according to claim 7, characterized in that: The correction formula of the peak threshold is: T peak_correct =T peak +k3·|T ambient -T ref | Among them, T peak_correct is the corrected peak threshold, k3 represents the influence of each degree of temperature change on the peak threshold, |T ambient -T ref |Indicates the absolute difference between the current ambient temperature and the reference temperature.

9. The intelligent peak-shaving coal processing system for thermal power generation according to claim 1, characterized in that: The energy storage device (7) comprises a storage battery and a solar power generator, wherein the storage battery is used to receive excess power from the power grid and power output by the solar power generator.

10. The intelligent peak-shaving coal processing system for thermal power generation according to claim 1, characterized in that: The motors in the crushing and screening equipment (1), the washing equipment (2), the drying equipment (3), the coal grinding equipment (4) and the transmission equipment (5) are variable frequency drive motors.

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