Method for measuring and calculating core indexes of coal-fired power plant

Abstract

The invention discloses a method for measuring and calculating a core index of a coal-fired thermal power plant, which comprises the following steps of: determining relevant basic parameters of fuel blending combustion of the coal-fired thermal power plant, and measuring and calculating a planned heat value of coal as fired on the basis of a heat value of each coal type and a corresponding blending combustion ratio; fuel core indexes are measured and calculated based on preset known fuel management conditions and a planned as-fired coal heat value, and the fuel core indexes at least comprise the coal consumption, the blending combustion amount of all coal types, the incoming coal amount, the heat value difference, the standard coal unit price and the inventory related indexes; by constructing a dynamic linkage measurement and calculation system of fuel core indexes, fuel management precision and lean of the coal-fired thermal power plant are effectively achieved, the planned heat value of coal as fired is measured and calculated on the basis of heat values and blending combustion ratios of all coal types, and it is ensured that index source data are accurate; and by correlating core indexes such as coal consumption, blending combustion and heat value difference, the correlative indexes are synchronously updated when any index input data is modified, so that the problem of data disjunction caused by traditional isolated measurement and calculation is avoided, and the management requirements of the thermal power plant are met.

Description

Technical Field

[0001] This invention relates to the field of coal-fired power plant management, and in particular to a method for calculating core indicators of coal-fired power plants. Background Technology

[0002] Fuel costs account for a very high proportion of the total operating costs of coal-fired power plants. Accurate calculation of core fuel indicators such as coal consumption, blending of different types of coal, coal delivered to the plant, calorific value difference, standard coal price, and inventory-related indicators is crucial to ensuring the economical and safe operation of the units.

[0003] However, the current traditional calculation methods have many shortcomings: the calculation of basic parameters is rough, the planned calorific value of coal fed into the furnace is mostly estimated by the average calorific value of a single coal type, without combining the dynamic weighted calculation of the blending ratio of each coal type, which leads to the distortion of source data and directly causes a large deviation between the calculation and the actual downstream indicators such as coal consumption. Core indicators are calculated in isolation. For example, the coal delivery plan relies solely on historical experience and is not linked to real-time blending volume and inventory structure, which can easily lead to coal stockpiling or shortages. The standard coal unit price calculation is also not synchronously linked to changes in the calorific value and transportation costs at the plant, lagging behind actual cost changes. The control of calorific value difference is passive, mostly based on post-event statistics. When the difference is exceeded, it is difficult to pinpoint the root cause, and the adjustment methods are crude. In addition, data is fragmented across departments. Data from departments such as procurement, quality inspection, blending, and inventory management cannot be exchanged in real time. Data needs to be manually summarized, resulting in low calculation efficiency and large errors. There is an urgent need for targeted core indicator calculation methods to solve the above problems. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is the inaccuracy of traditional measurement methods.

[0005] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a method for calculating core indicators of coal-fired power plants, which includes, Determine the basic parameters related to fuel blending in coal-fired power plants, and calculate the planned calorific value of coal to be fed into the furnace based on the calorific value of each type of coal and the corresponding blending ratio. Based on the preset known conditions of fuel management and the planned calorific value of coal fed into the furnace, the core fuel indicators are calculated respectively. The core fuel indicators include at least the amount of coal consumed, the amount of each type of coal blended, the amount of coal delivered to the plant, the difference in calorific value, the unit price of standard coal and related inventory indicators. By associating various core fuel indicators, the system can independently calculate a single core fuel indicator and combine multiple core fuel indicators for calculation.

[0006] In a preferred embodiment of the method for calculating core indicators of coal-fired power plants according to the present invention: the preset known conditions for fuel management include coal consumption for power supply, planned power generation, and plant power consumption rate; the formula for calculating coal consumption is:

[0007] Where d is the planned calorific value of the coal fed into the furnace; e is the amount of coal consumed; a is the coal consumption for power supply; b is the planned power generation; and c is the plant's power consumption rate.

[0008] In a preferred embodiment of the method for calculating core indicators of coal-fired power plants according to the present invention: the calculation of the blending amount of each type of coal is based on the coal consumption and the blending ratio of each type of coal, and the calculation formula is as follows:

[0009] Where e is the amount of coal consumed, g is the amount of each type of coal blended, and f is the blending ratio of each type of coal. The calculation methods for blending amounts of various coal types include monthly cumulative blending amount, annual cumulative blending amount, and phased cumulative blending amount. Furthermore, the blending amount of each coal type can be corrected by adjusting the coal consumption for power supply, planned power generation, and blending ratio.

[0010] In a preferred embodiment of the method for calculating core indicators of coal-fired power plants according to the present invention: the calculation of the coal inflow is based on the blending amount of each type of coal to formulate the coal inflow plan, and it is necessary to determine the planned coal inflow ratio of each type of coal. The formula for calculating the planned coal inflow ratio is as follows:

[0011] Where v is the planned coal delivery ratio; z is the total coal delivery volume to the plant; h is the coal delivery volume of any coal type to the plant, and the total coal delivery volume to the plant is the sum of the coal delivery volumes of each coal type to the plant.

[0012] In a preferred embodiment of the method for calculating core indicators of coal-fired power plants described in this invention: when formulating the coal delivery plan, the coal delivery plan scheme is determined by cyclically adjusting the amount of coal delivered to the plant, the blending amount of each type of coal, the blending ratio, and the inventory structure; the inventory structure is determined by inventory-related indicators, which include the ending inventory of each type of coal and the total ending inventory.

[0013] In a preferred embodiment of the method for calculating core indicators of coal-fired power plants according to the present invention: the formula for calculating the calorific value difference is:

[0014] Where i is the calorific value difference, j is the weighted calorific value of the coal entering the plant, and k is the weighted calorific value of the coal entering the furnace; The weighted calorific value of the coal entering the plant is the weighted average of the amount of coal entering the plant for each type of coal and the corresponding calorific value. The weighted calorific value of the coal entering the furnace is the weighted average of the amount of coal blended for each type of coal and the corresponding calorific value. The calculation types of the calorific value difference include monthly cumulative calorific value difference, annual cumulative calorific value difference, and periodic cumulative calorific value difference.

[0015] In a preferred embodiment of the method for calculating core indicators of coal-fired power plants described in this invention: when the calorific value difference exceeds the preset target value of the coal-fired power plant, control measures are formulated by adjusting at least one of the following: coal input structure, standard coal unit price, inventory structure, or blending scheme. The adjustment of the coal intake structure includes modifying the amount of coal entering the plant or the calorific value of coal entering the plant; the adjustment of the blending scheme includes modifying the blending ratio; and the adjustment of the inventory structure includes modifying the ending inventory of each type of coal.

[0016] In a preferred embodiment of the method for calculating core indicators of coal-fired power plants described in this invention: the standard coal unit price includes the standard coal unit price of each type of coal and the comprehensive standard coal unit price; The unit price of standard coal for each coal type is calculated based on its calorific value at the plant, unit calorific value, and transportation and miscellaneous costs. The calculation formula is as follows:

[0017] Where p is the standard coal unit price of each coal type, l is the calorific value of each coal type delivered to the plant, m is the unit price, and n is the transportation and miscellaneous charges; The formula for calculating the price per card is as follows:

[0018] Where m is the price per calorie, w is the contract price per coal type, and x is the contract calorific value per coal type.

[0019] In a preferred embodiment of the method for calculating core indicators of coal-fired power plants described in this invention: the comprehensive standard coal unit price is the weighted average of the standard coal unit price of each type of coal and the corresponding amount of coal delivered to the plant; The calculation methods for the standard coal unit price and comprehensive standard coal unit price of each coal type include monthly cumulative calculation, annual cumulative calculation, and phased cumulative calculation.

[0020] In a preferred embodiment of the method for calculating core indicators of coal-fired power plants according to the present invention: the dynamic linkage of indicators means that when the input data of any fuel core indicator is modified, all other fuel indicator data associated with that indicator are updated synchronously. The target values ​​of indicators preset by coal-fired power plants are used as critical thresholds, and control measures are adjusted based on the updated indicator data.

[0021] The beneficial effects of this invention are as follows: by constructing a dynamic linkage calculation system for core fuel indicators, it effectively achieves precision and efficiency in fuel management of coal-fired power plants. It calculates the planned calorific value of coal fed into the furnace based on the calorific value and blending ratio of each type of coal, ensuring the accuracy of the source data of the indicators. Furthermore, by linking core indicators such as coal consumption, blending amount, and calorific value difference, it enables synchronous updates of related indicators when the input data of any indicator is modified, avoiding the data disconnect problem caused by traditional isolated calculations and meeting the management needs of thermal power plants. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A flowchart is shown for the method of calculating core indicators for coal-fired power plants. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, specific embodiments are described below. The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0024] Reference Figure 1 This embodiment provides a method for calculating core indicators of coal-fired power plants, including... S1: Determine the basic parameters related to fuel blending in coal-fired power plants, and calculate the planned calorific value of coal to be fed into the furnace based on the calorific value of each type of coal and the corresponding blending ratio; According to industry standards for fuel calculation in thermal power plants, the formula for calculating the planned calorific value (unit: Kcal / kg) of coal fed into the furnace is as follows:

[0025] Where n is the total number of coal types involved in blending, q i Let be the measured calorific value of the i-th type of coal, in kcal / kg, and ri be the blending ratio of the i-th type of coal. This means summing the calorific value of all blended coal types by multiplying the blending ratio. By weighting the blending ratio, it reflects the contribution of different coal types in the blended coal, avoiding misjudgment of the overall calorific value due to fluctuations in the calorific value of a single coal type.

[0026] S2: Based on the preset known conditions of fuel management and the planned calorific value of coal fed into the furnace, calculate the core fuel indicators respectively. The core fuel indicators include at least the amount of coal consumed, the amount of each type of coal blended, the amount of coal delivered to the plant, the difference in calorific value, the unit price of standard coal and related inventory indicators. S2.1: The preset known conditions for fuel management include coal consumption for power supply, planned power generation, and plant power consumption rate; based on the preset coal consumption for power supply, planned power generation, plant power consumption rate, and the planned calorific value d of the coal fed into the furnace obtained in step S1, the coal consumption E is calculated using a formula, which is:

[0027] Where d is the planned calorific value of the coal fed into the furnace; e is the amount of coal consumed; a is the coal consumption for power supply; b is the planned power generation; c is the plant power consumption rate. The unit of the amount of coal consumed is 10,000 tons; the unit of the coal consumption for power supply is g / kW·h; the unit of the planned power generation is 100 million kWh; and the unit of the planned calorific value of the coal fed into the furnace is kcal / kg.

[0028] S2.2: Calculate the amount of each type of coal to be blended based on the coal consumption obtained in step S2.1 and the blending ratio of each type of coal determined in step S1. The calculation of the blending amount of each coal type is based on the coal consumption and the blending ratio of each coal type. The calculation formula is as follows:

[0029] Where e is the amount of coal consumed, g is the amount of each type of coal blended, and f is the blending ratio of each type of coal. The calculation methods for blending amounts of various coal types include monthly cumulative blending amount, annual cumulative blending amount, and phased cumulative blending amount. Furthermore, the blending amount of each coal type can be corrected by adjusting the coal consumption for power supply, planned power generation, and blending ratio.

[0030] S2.3: Based on the blending amount of each coal type obtained in step S2.2, formulate the coal input plan and calculate the coal input amount of each coal type; The calculation of the coal delivery volume is based on the coal delivery plan formulated according to the blending amount of each coal type. It is necessary to determine the planned delivery ratio of each coal type. The formula for calculating the planned delivery ratio is as follows:

[0031] Where v is the planned coal delivery ratio; z is the total coal delivery volume to the plant; and h is the coal delivery volume of any coal type to the plant. The total coal delivery volume to the plant is the sum of the coal delivery volumes of all coal types, which is the sum of the coal delivery volumes of all coal types to the plant.

[0032] S2.5: When formulating the coal delivery plan, the coal delivery quantity, blending quantity and blending ratio of each coal type are adjusted cyclically to determine the coal delivery plan scheme; the inventory structure and related inventory indicators are determined, including the ending inventory of each coal type and the total ending inventory.

[0033] S2.6: Calculate the difference between the weighted calorific value of the coal entering the plant and the weighted calorific value of the coal entering the furnace to obtain the calorific value difference; The formula for calculating the difference in calorific value is:

[0034] Where i is the calorific value difference, j is the weighted calorific value of the coal entering the plant, and k is the weighted calorific value of the coal entering the furnace; The weighted calorific value of the coal entering the plant is the weighted average of the amount of coal entering the plant for each type of coal and the corresponding calorific value. The weighted calorific value of the coal entering the furnace is the weighted average of the amount of coal blended for each type of coal and the corresponding calorific value. The calculation types of the calorific value difference include monthly cumulative calorific value difference, annual cumulative calorific value difference, and periodic cumulative calorific value difference.

[0035] When the difference in calorific value exceeds the target value preset by the coal-fired power plant, control measures shall be formulated by adjusting at least one of the following: coal input structure, standard coal unit price, inventory structure, or blending scheme. The adjustment of the coal intake structure includes modifying the amount of coal entering the plant or the calorific value of coal entering the plant; the adjustment of the blending scheme includes modifying the blending ratio; and the adjustment of the inventory structure includes modifying the ending inventory of each type of coal.

[0036] S2.7. Based on the calorific value, unit price, and transportation and miscellaneous charges of each type of coal, calculate the standard coal unit price of each type of coal, and based on the standard coal unit price of each type of coal and the corresponding quantity delivered to the plant, calculate the comprehensive standard coal unit price. The standard coal unit price includes the standard coal unit price for each coal type and the comprehensive standard coal unit price. The calculation of the standard coal unit price for each coal type is based on the calorific value, unit calorie price, and transportation and miscellaneous charges for each coal type. The invention will be further described in detail below, along with the accompanying drawings. The calculation formula is as follows:

[0037] Where p is the standard coal unit price of each coal type, l is the calorific value of each coal type delivered to the plant, m is the unit price, and n is the transportation and miscellaneous charges; The formula for calculating the price per card is:

[0038] Where m is the price per calorie, w is the contract price for a single coal type, x is the contract calorific value for a single coal type, and the comprehensive standard coal unit price is the weighted average of the standard coal unit price for each coal type and the corresponding amount of coal delivered to the plant; the calculation types of the standard coal unit price for each coal type and the comprehensive standard coal unit price include monthly cumulative calculation, annual cumulative calculation and phased cumulative calculation.

[0039] S3. By associating various core fuel indicators, calculate the single core fuel indicator independently and combine multiple core fuel indicators for calculation.

[0040] The specific implementation method of linking the core fuel indicators strictly follows the document content as follows: when the input data of any core fuel indicator is modified, the data of all other core fuel indicators that are related to that indicator will be updated synchronously.

[0041] For example, when adjusting the planned calorific value of coal fed into the furnace, the coal consumption will be updated simultaneously. Changes in coal consumption will in turn update the blending amount of each type of coal, thereby affecting indicators such as the amount of coal delivered to the plant and the ending inventory, ensuring that the related data always remain consistent. Furthermore, the target values ​​of indicators preset by coal-fired power plants are used as critical thresholds. Control measures are adjusted based on the updated indicator data. For example, when the difference in calorific value exceeds the limit, control measures can be formulated by adjusting the coal input structure, standard coal unit price, inventory structure, blending scheme, etc. Through targeted adjustments, each indicator is always within the target value range. Meanwhile, the cross-departmental system, including fuel procurement, quality inspection, blending operations, inventory management, and cost accounting, forms a closed-loop management system through inter-departmental collaboration, enabling precise and lean fuel management and supporting the safe, environmentally friendly, and economical operation of thermal power plants.

[0042] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A method for calculating core indicators of coal-fired power plants, characterized in that: include, Determine the basic parameters related to fuel blending in coal-fired power plants, and calculate the planned calorific value of coal to be fed into the furnace based on the calorific value of each type of coal and the corresponding blending ratio. Based on the preset known conditions of fuel management and the planned calorific value of coal fed into the furnace, the core fuel indicators are calculated respectively. The core fuel indicators include at least the amount of coal consumed, the amount of each type of coal blended, the amount of coal delivered to the plant, the difference in calorific value, the unit price of standard coal and related inventory indicators. By associating various core fuel indicators, the system can independently calculate a single core fuel indicator and combine multiple core fuel indicators for calculation.

2. The method for calculating core indicators of coal-fired power plants according to claim 1, characterized in that: The preset known conditions for fuel management include coal consumption for power supply, planned power generation, and plant power consumption rate; the formula for calculating coal consumption is: Where d is the planned calorific value of the coal fed into the furnace; e is the amount of coal consumed; a is the coal consumption for power supply; b is the planned power generation; and c is the plant's power consumption rate.

3. The method for calculating core indicators of coal-fired power plants according to claim 2, characterized in that: The calculation of the blending amount of each coal type is based on the coal consumption and the blending ratio of each coal type. The calculation formula is as follows: Where e is the amount of coal consumed, g is the amount of each type of coal blended, and f is the blending ratio of each type of coal. The calculation methods for blending amounts of various coal types include monthly cumulative blending amount, annual cumulative blending amount, and phased cumulative blending amount. Furthermore, the blending amount of each coal type can be corrected by adjusting the coal consumption for power supply, planned power generation, and blending ratio.

4. The method for calculating core indicators of coal-fired power plants according to claim 1, characterized in that: The calculation of the coal delivery volume is based on the coal delivery plan formulated according to the blending amount of each coal type. It is necessary to determine the planned delivery ratio of each coal type. The formula for calculating the planned delivery ratio is as follows: Where v is the planned coal delivery ratio; z is the total coal delivery volume to the plant; h is the coal delivery volume of any coal type to the plant, and the total coal delivery volume to the plant is the sum of the coal delivery volumes of each coal type to the plant.

5. The method for calculating core indicators of coal-fired power plants according to claim 4, characterized in that: When formulating the coal delivery plan, the coal delivery volume, blending volume and blending ratio of each coal type are adjusted cyclically, and the inventory structure is used to determine the coal delivery plan scheme. The inventory structure is determined by inventory-related indicators, including the ending inventory of each coal type and the total ending inventory.

6. The method for calculating core indicators of coal-fired power plants according to claim 1, characterized in that: The formula for calculating the difference in calorific value is: Where i is the calorific value difference, j is the weighted calorific value of the coal entering the plant, and k is the weighted calorific value of the coal entering the furnace; The weighted calorific value of the coal entering the plant is the weighted average of the amount of coal entering the plant for each type of coal and the corresponding calorific value. The weighted calorific value of the coal entering the furnace is the weighted average of the amount of coal blended for each type of coal and the corresponding calorific value. The calculation types of the calorific value difference include monthly cumulative calorific value difference, annual cumulative calorific value difference, and periodic cumulative calorific value difference.

7. The method for calculating core indicators of coal-fired power plants according to claim 6, characterized in that: When the difference in calorific value exceeds the target value preset by the coal-fired power plant, control measures shall be formulated by adjusting at least one of the following: coal input structure, standard coal unit price, inventory structure, or blending scheme. The adjustment of the coal intake structure includes modifying the amount of coal entering the plant or the calorific value of coal entering the plant; the adjustment of the blending scheme includes modifying the blending ratio; and the adjustment of the inventory structure includes modifying the ending inventory of each type of coal.

8. The method for calculating core indicators of coal-fired power plants according to claim 1, characterized in that: The standard coal unit price includes the standard coal unit price for each type of coal and the comprehensive standard coal unit price; The calculation of the standard coal unit price for each coal type is based on the calorific value delivered to the plant, the unit calorific value, and transportation and miscellaneous charges for each coal type. The calculation formula is as follows: Where p is the standard coal unit price of each coal type, l is the calorific value of each coal type delivered to the plant, m is the unit price, and n is the transportation and miscellaneous charges; The formula for calculating the price per card is as follows: Where m is the price per calorie, w is the contract price per coal type, and x is the contract calorific value per coal type.

9. The method for calculating core indicators of coal-fired power plants according to claim 8, characterized in that: The comprehensive standard coal unit price is the weighted average of the standard coal unit price of each coal type and the corresponding coal quantity delivered to the plant. The calculation methods for the standard coal unit price and comprehensive standard coal unit price of each coal type include monthly cumulative calculation, annual cumulative calculation, and phased cumulative calculation.

10. The method for calculating core indicators of coal-fired power plants according to claim 1, characterized in that: The dynamic linkage of indicators means that when the input data of any core fuel indicator is modified, all other fuel indicator data associated with that indicator are updated synchronously. The target values ​​of indicators preset by coal-fired power plants are used as critical thresholds, and control measures are adjusted based on the updated indicator data.

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