Method and system for determining industrial steam supply production cost of heat supply unit

Abstract

The invention belongs to the technical field of energy conservation and consumption reduction, and provides a method and system for determining the industrial steam supply production cost of a heat supply unit, and the technical scheme is that the unit is limited based on unit operation boundary limiting conditions, and thermal performance test data of the unit under each working condition is calculated through obtained unit data; calculating external gas supply coal consumption cost and steam supply plant power consumption cost of the unit based on the thermal performance test data of the unit under each working condition; unit output capacity reduction loss and unit start-stop benefit loss are calculated by combining thermal performance test data and spot market operation rules of the unit under each working condition; and calculating the total cost of industrial gas supply by combining the external gas supply coal consumption cost of the unit, the power consumption cost of the steam supply plant, the unit output capacity reduction loss, the unit start-stop benefit loss, the power consumption cost of the steam supply plant and other financial costs. And the current industrial steam supply cost calculation method of the heat supply unit is simplified.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy saving and consumption reduction, and in particular relates to a method and system for determining the production cost of industrial steam supply of a heating unit. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The industrial steam extraction price plays a decisive role in whether the industrial steam extraction unit is profitable. At present, the calculation of the industrial steam extraction price is mainly through the calculation of coal consumption through thermal tests, and the calculation is relatively simple. However, for industrial steam extraction units, there are many factors that determine its cost. It becomes extremely complicated to calculate whether the unit is profitable under all working conditions. It is necessary to consider the operating cost, spot market income, industrial steam extraction price of the unit, industrial steam extraction parameters, unit purchased power costs, water costs, material costs, public system maintenance costs and other financial cost increases. The existing technical methods cannot accurately calculate the cost of industrial steam supply for heating units. Summary of the invention

[0004] In order to solve at least one technical problem existing in the above-mentioned background technology, the present invention provides a method and system for determining the industrial steam supply cost of a heating unit, which analyzes the unit model under the operation mode of electricity spot trading rules, determines the unit type, industrial steam extraction parameters and other conditions, and proposes a simplified calculation method.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A first aspect of the present invention provides a method for determining the cost of industrial steam supply for a heating unit, comprising the following steps:

[0007] Obtain the thermal performance data of the unit under various operating conditions, draw the industrial steam supply condition diagram of the corresponding unit based on the thermal performance data of the unit under various operating conditions, and determine the boundary restriction conditions of the unit operation;

[0008] The unit is restricted based on the unit operation boundary restriction conditions, and the thermal performance test data of the unit under various operating conditions is calculated through the acquired unit data;

[0009] Based on the thermal performance test data of the unit under various working conditions, the coal consumption cost of the unit's external gas supply and the electricity cost of the steam plant are calculated;

[0010] Combining the thermal performance test data of the unit under various operating conditions and the spot market operation rules, the unit output capacity reduction loss and the unit start-up and shutdown benefit loss are calculated;

[0011] The total cost of industrial gas supply is calculated by combining the unit's coal consumption cost for external gas supply, the steam plant's electricity cost, the unit's output capacity reduction loss, the unit's start-up and shutdown benefit loss, the steam plant's electricity cost and other financial costs.

[0012] Furthermore, the thermal performance data of the unit under various operating conditions include the unit pure condensation test, 50%, 60%, 75% electric load and different industrial steam supply conditions test data and different industrial steam supply conditions test data at the maximum continuous evaporation amount of the boiler.

[0013] Furthermore, the operating boundary constraints of the unit include the maximum evaporation capacity of the boiler and the maximum industrial steam supply capacity.

[0014] Furthermore, the calculation method of the unit's external steam and coal consumption cost under various operating conditions includes:

[0015] The unit's power generation coal consumption rate under steam supply conditions is determined by multiplying the unit's power generation coal consumption rate under the same electrical load under pure condensing conditions by the coal consumption correction coefficient caused by the decrease in cylinder efficiency;

[0016] Calculate the unit's coal consumption for power generation based on the unit's coal consumption rate under steam supply conditions;

[0017] The total coal consumption of the unit minus the coal consumption of the unit for power generation is the coal consumption of the unit for external steam supply;

[0018] The unit's external steam and coal consumption cost is calculated based on the unit's external steam and coal consumption and the unit price of coal.

[0019] Furthermore, the electricity cost calculation method of the steam supply plant is to convert the steam supply plant electricity consumption according to the heat supply ratio multiplied by the total plant electricity consumption, calculate the steam supply plant electricity consumption by the computer group, and convert the steam supply plant electricity cost per ton.

[0020] Furthermore, the calculation process of the unit output capacity reduction loss includes:

[0021] According to the reheat steam flow rate and desuperheating water spray ratio and the average enthalpy of reheat steam in the test results, the power generation reduction of the unit due to each ton of industrial steam supply is converted;

[0022] Count the probability that the load factor of the units in the spot market is greater than the set threshold throughout the year, and determine the profitable electricity price in the load segment;

[0023] The power generation loss cost caused by each ton of industrial steam supply is calculated by combining the power generation reduction of the unit due to each ton of industrial steam supply, the probability that the operating unit load is greater than the set threshold, and the product of the profitable electricity price of the load section;

[0024] The calculation process of the unit start-up and shutdown benefit loss includes:

[0025] Calculate the power generation cost of each load section based on the unit power generation coal consumption rate in the test results;

[0026] When the power generation cost of each load segment is less than the transaction price, calculate the downtime opportunity loss;

[0027] When the downtime opportunity loss is greater than the startup cost, the unit start-up and shutdown benefit loss is calculated based on the difference between the downtime opportunity loss and the startup cost.

[0028] Furthermore, after obtaining the total cost of industrial gas supply, the selling price of gas is calculated according to the current standard coal price and the required increase in revenue and profit.

[0029] A second aspect of the present invention provides a system for determining the cost of industrial steam supply for a heating unit, comprising:

[0030] An operation boundary determination module is used to obtain the thermal performance data of the unit under various operating conditions, draw the industrial steam supply condition diagram of the corresponding unit based on the thermal performance data of the unit under various operating conditions, and determine the unit operation boundary restriction conditions;

[0031] A test data calculation module is used to restrict the unit based on the unit operation boundary restriction conditions, and obtain the thermal performance test data of the unit under various working conditions through the obtained unit data calculation;

[0032] The cost calculation module is used to calculate the unit's external gas supply coal consumption cost and the steam supply plant electricity cost based on the unit's thermal performance test data under various operating conditions; calculate the unit's output capacity reduction loss and unit start-up and shutdown benefit loss in combination with the unit's thermal performance test data under various operating conditions and the spot market operation rules; and calculate the total industrial gas supply cost by combining the unit's external gas supply coal consumption cost, the steam supply plant electricity cost, the unit's output capacity reduction loss, the unit start-up and shutdown benefit loss, the steam supply plant electricity cost and other financial costs.

[0033] A third aspect of the present invention provides a computer-readable storage medium.

[0034] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps in the method for determining the industrial steam supply cost of a heating unit as described above.

[0035] A fourth aspect of the present invention provides a computer device.

[0036] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps in the method for determining the industrial steam supply cost of a heating unit as described above are implemented.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention analyzes the unit model under the operation mode of power spot trading rules, determines the unit type, industrial steam extraction parameters and other conditions, and proposes a simplified calculation method to solve the problem that there are many factors that determine the cost of industrial steam extraction units, and the cost of industrial steam supply for heating units cannot be accurately calculated.

[0039] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0041] Figure 1 It is a flow chart of a method for determining the cost of industrial steam supply for a heating unit provided by an embodiment of the present invention;

[0042] Figure 2 An industrial steam supply condition diagram of a certain unit obtained by drawing according to test data provided by an embodiment of the present invention;

[0043] Figure 3 is the traditional gas supply coal consumption cost provided by the embodiment of the present invention;

[0044] Figure 4 It is the coal consumption for power generation under mixed industrial steam supply operation of current general units in various working conditions provided by the embodiment of the present invention;

[0045] Figure 5 It is a curve diagram showing the change of coal consumption rate of power generation of a unit along with steam supply flow rate provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Embodiment 1

[0050] like Figure 1 As shown, this embodiment provides a method for determining the cost of industrial steam supply for a heating unit, comprising the following steps:

[0051] Step 1: Obtain the thermal performance data of the unit under various operating conditions, draw the industrial steam supply condition diagram of the corresponding unit based on the thermal performance data of the unit under various operating conditions, and determine the boundary restriction conditions of the unit operation;

[0052] The unit is operated with industrial steam supply for a long time, and its operating characteristics are different from those of pure condensing units. In order to determine the operating boundaries of the unit under different operating conditions, it is necessary to draw the industrial steam supply condition diagram of the corresponding unit, such as Figure 2 The figure shows the industrial steam supply condition diagram of a unit drawn based on the test data;

[0053] According to the results of the industrial steam supply condition diagram, there are two boundary constraints for the unit operation under the industrial steam supply condition:

[0054] First, the maximum evaporation capacity of the boiler limits the maximum power generation and steam supply capacity of the unit; second, the maximum industrial steam supply limit line limits the maximum steam supply capacity of the unit under different operating conditions.

[0055] It should be noted that Figure 2 The minimum electrical load limit line for industrial steam supply is not included. During the test, in order to ensure the safe operation of the unit, the test load did not apply for a lower load, so the minimum electrical load limit line for industrial steam supply cannot be drawn; during the test, the unit steam supply operation is controlled at the lowest electrical load, and the maximum industrial steam supply demand is met under this load.

[0056] According to the industrial steam extraction conditions of the unit Figure 2 Used to guide subsequent operation of the unit.

[0057] Step 2: Restrict the unit based on the unit operation boundary restriction conditions, and calculate the thermal performance test data of the unit under various operating conditions through the acquired unit data;

[0058] In this embodiment, the calculated unit thermal performance test results include pure condensation test of a 300,000-level unit, 50%, 60%, 75% electric load different industrial steam supply conditions test data and different industrial steam supply conditions test data under the maximum continuous evaporation of the boiler;

[0059] During the thermal test, each operating condition is tested, provided that the parameter adjustment and system isolation meet the requirements of the test outline, and the test is stabilized for half an hour and recorded for one hour.

[0060] Test result processing: Data processing selects a relatively stable period of continuous recorded data (generally one to two hours) recorded by the data acquisition system for each working condition to obtain the average value as the basis for performance calculation. The measurement values ​​of multiple measurement points of the same parameter are taken as the arithmetic mean; the differential pressure measurement value is taken as the square of the average value of the square root of the measurement value at each moment. The water level change of each water storage container is converted into equivalent flow rate according to the container size, test duration and medium density.

[0061] The main condensate flow rate is calculated using the calibrated outflow coefficient for formula (3). The flow rate calculation formula is expressed by formula (1):

[0062]

[0063] Where C is the nozzle discharge coefficient, ε is the expansion coefficient of the fluid, d is the nozzle throat diameter under actual operating conditions, unit: m; Δp is the nozzle differential pressure, unit: Pa; ρ f1 is the density of the measured medium, kg / m 3 , is the ratio of the nozzle throat diameter to the pipe inner diameter under actual operating conditions;

[0064] Calculation of test results: The calculation of test results mainly includes the calculation of each measured flow rate, final feed water flow rate, main steam flow rate, reheat steam flow rate, high-pressure heater heat balance, turbine flow rate at each stage, test heat rate, power generation coal consumption rate, industrial steam supply coal consumption rate, etc. The steam leakage flow rate of shaft seals, gate rods, etc. is determined, and the steam leakage flow rate of each shaft seal and gate rod is taken as the design value.

[0065] Distribution of unknown leakage in the system: If the unknown leakage rate of the system does not exceed 0.1%, all the unknown leakage in the system will be assigned to the boiler side. If the unknown leakage rate of the system is greater than 0.1% and less than 0.3%, the 0.1% part will be assigned to the boiler, and the rest will be assigned to the boiler and the turbine half and the boiler half respectively. The unknown leakage rate of the industrial steam supply condition test can refer to the pure condensation test.

[0066] The main calculation formulas include:

[0067] The unknown leakage of the system is used in formula (4) and is expressed by formula (2):

[0068] ΔG=G da +G hw -G ml (2)

[0069] In the formula, ΔG is the unknown leakage of the system, t / h, G da is the equivalent flow rate of the water level change in the deaerator tank (the water level drops as positive), t / h; G hw is the equivalent flow rate of the condenser hot well water level change (the water level drop is positive), t / h; G mlis the system apparent leakage, t / h.

[0070] The water flow rate is expressed by formula (3):

[0071] G ffw =G cw +G da +G HP3d +G DAstm -G shs -G rhs -G gxss (3)

[0072] In the formula, G ffw is the final water supply flow rate, t / h; G cw Main condensate flow, t / h; G HP3d is the drain flow rate of No. 3 high-pressure heater, t / h; G DAstm is the steam flow rate of the deaerator, t / h; G shs is the desuperheater water flow rate, t / h; G rhs is the reheater desuperheating water flow rate, t / h; G gxs It is the flow rate of industrial steam desuperheating water, t / h.

[0073] The main steam flow rate is expressed by formula (4):

[0074] G ms =G ffw +G shs -ΔG b (4)

[0075] In the formula, G ms is the main steam flow, t / h; ΔG b It is the furnace side leakage, which is equal to 50% of the unknown leakage of the ΔG system (when there is no special requirement), t / h.

[0076] The cold reheat steam flow is expressed by formula (5):

[0077]

[0078] In the formula, G crh is the cold reheat steam flow rate, t / h; G vlHP is the total steam leakage of the high-pressure valve rod, t / h; G glHP G is the total steam leakage of the front and rear shaft seals of the high-pressure cylinder, t / h; exi is the steam supply flow rate, t / h.

[0079] The hot reheat steam flow rate is expressed by formula (6):

[0080] G hrh =G crh +G rhs (6)

[0081] In the formula, G hrh Indicates the hot reheat steam flow rate, t / h;

[0082] The test heat rate is expressed by formula (7):

[0083]

[0084] Where HR is the test heat rate, kJ / (kW.h); G gxs is the industrial steam supply flow, t / h; G k Industrial steam supply and water flow rate, t / h; h k is the enthalpy corresponding to the industrial steam supply and water supply flow rate; h ms 、h hrh 、h ffw 、h shs 、h crh 、h rhs 、h gxs Enthalpy corresponding to main steam flow, hot reheat steam flow, final feed water flow, superheater desuperheating water flow, cold reheat steam flow, reheater desuperheating water flow, and industrial steam supply desuperheating water flow, kJ / kg; P g is the generator output power, MW; P i The power consumed by each item when static excitation and electric main oil pump are used, MW;

[0085] The unit power generation coal consumption rate is expressed by formula (8):

[0086]

[0087] Where b s is the coal consumption rate for power generation, g / (kW.h); η b is the boiler efficiency; η p The piping efficiency and boiler efficiency are determined by interpolation of the main steam flow rate with reference to recent boiler performance test results.

[0088] The calculation process of industrial steam supply coal consumption rate includes:

[0089] Method 1: Common algorithm. According to DL / T_904-2015 "Calculation Method for Technical and Economic Indicators of Thermal Power Plants", the benefits of heat supply (steam supply) are attributed to the power generation part. The heat supply is calculated according to the heat absorption of the unit cycle without distinguishing the quality. The specific calculation method is expressed by formula (9):

[0090]

[0091] Where b ex is the coal consumption rate for industrial steam supply, g / t; h exs The value of h gxs Consistency;

[0092] Method 2: Operating condition comparison method. The power dispatching department usually allocates units according to the electric load. By comparing the energy consumption changes of the units under the same load under the heating condition and the pure condensing condition, the changes in the heating cost of the units are calculated. This method can be considered as the actual energy consumption cost of the heating of the units. Specifically for the heating condition, it can be understood that the actual coal consumption of the unit is used for the power generation and heating of the unit. The coal consumption of the power generation part is basically the same as the coal consumption rate under the pure condensing condition with the same load. After deducting the coal consumption of power generation, the remaining is the coal consumption of steam supply, which is expressed by formula (10):

[0093]

[0094] Where b ex is the power generation coal consumption rate, g / kW.h; ξ is the rate of change of the unit power generation coal consumption rate caused by the change of cylinder efficiency; P is the unit power generation power, MW; Q is the unit cycle heat absorption, the unit cycle heat absorption Q, expressed by formula (11): Q = G ms ×h ms +G hrh ×h hrh -G ffw ×h ffw -G shs ×h shs -G crh ×h crh -G rhs ×h rhs .

[0095] According to the relevant provisions of the test procedures, the second type of correction is made to the heat rate test results of pure condensing conditions.

[0096] The second type of correction uses the relevant correction curves provided by the manufacturer to correct parameters, mainly including main steam pressure, main steam temperature, reheat pressure loss, reheat temperature, and low-pressure cylinder exhaust pressure.

[0097] The corrected heat rate of the unit is expressed by formula (12):

[0098] H r =H t / C1 / C2 / C3 / C4 / C5 (12),

[0099] In the formula: C1, C2, C3, C4, C5 are the correction coefficients of main steam pressure, main steam temperature, reheat pressure loss, reheat temperature, and low-pressure cylinder exhaust pressure on heat rate. t The value of is consistent with HR.

[0100] Finally, the data obtained based on the above calculation formula are shown in Tables 1 to 5;

[0101] Table 1 Main test results of pure condensation condition

[0102]

[0103] Table 2 Test results of 50% electrical load and different industrial steam supply conditions

[0104]

[0105]

[0106] Table 3 Test results of different industrial steam supply conditions with 60% electrical load

[0107]

[0108] Table 4 Test results of different industrial steam supply conditions with 75% electrical load

[0109]

[0110]

[0111] Table 5 Main test results of different industrial steam supply conditions under the maximum continuous evaporation of the boiler

[0112]

[0113] Since the unit uses reheat steam mixed with desuperheated water from the middle tap of the feed water pump, the flow measurement point measures the total steam supply after mixing. Therefore, the reheat steam supply flow rate must first be determined based on the heat balance relationship. The calculation results are listed in the table above.

[0114] Step 3: The coal consumption cost of the computer group supplying gas to the outside;

[0115] According to the calculation method specified in the "Calculation Method of Technical and Economic Indicators of Thermal Power Plants" (DL / T 904-2015), the steam and coal consumption rate depends only on the external heating parameters of the unit and has nothing to do with the unit's operating mode and load rate. Figure 3 The unit's external steam supply is cooled and decompressed to near the required parameters, so the steam supply coal consumption rate is not affected by the unit's operation adjustment and basically remains fixed. Determine the steam supply coal consumption rate of a unit under various operating conditions, and calculate the unit's external steam supply coal consumption cost according to industry standards.

[0116] In terms of steam supply revenue, the current calculation standard converts the heat (steam supply) revenue to the power generation side.

[0117] According to the current general calculation method, compared with the test results of pure condensing conditions, the coal consumption of power generation under mixed industrial steam supply operation of each working condition is calculated. Figure 4 .

[0118] Through the current general calculation method, it can be found that it attributes the benefits of heat (steam) supply to the power generation side, and evaluates the economic efficiency of unit heat supply by the reduction of power generation coal consumption rate. The heat (steam) supply cost calculated in this way is not accurate enough, and secondly, it cannot intuitively express the changes in the heat (steam) supply cost.

[0119] In this embodiment, a new calculation is adopted, specifically:

[0120] The unit's power generation coal consumption rate under steam supply conditions is determined by multiplying the unit's power generation coal consumption rate under the same electrical load under pure condensing conditions by the coal consumption correction coefficient caused by the decrease in cylinder efficiency;

[0121] Calculate the unit's coal consumption for power generation based on the unit's coal consumption rate under steam supply conditions;

[0122] The total coal consumption of the unit minus the coal consumption of the unit for power generation is the coal consumption of the unit for external steam supply;

[0123] The curve of the unit's coal consumption rate changing with steam flow rate is as follows: Figure 5 As shown;

[0124] The unit's external steam and coal consumption cost is calculated based on the unit's external steam and coal consumption and the unit price of coal.

[0125] Step 4: Combine the thermal performance test data of the unit under various operating conditions and the spot market operation rules to calculate the unit output capacity reduction loss and the unit start-up and shutdown benefit loss;

[0126] The revenue from electricity sales of the units is affected by the relationship between electricity supply and demand. When the electricity price exceeds 1 yuan per kilowatt-hour during the period of tight electricity supply, the generator units need to increase their power output to obtain revenue.

[0127] Negative electricity prices will occur during periods of sufficient supply, requiring generators to reduce their output or even shut down to avoid losses. Industrial steam extraction units need to ensure a stable industrial steam supply, and the operation of the units has corresponding operating boundary restrictions, namely the unique operating range of thermal power units, which limits the units' ability to participate in the regulation of the electricity spot market and results in opportunity cost losses.

[0128] It is specifically reflected in two aspects: first, the unit's high-load capacity decreases, power generation decreases during peak periods of electricity demand, and the income from high-priced electricity decreases; second, industrial steam supply is restricted, and the unit must ensure stable operation above a specific load. During periods of low electricity demand, it cannot adopt low load or shutdown peak regulation to avoid losses, and is forced to bear losses from low or even negative electricity prices.

[0129] The specific steps include:

[0130] Step 401: The calculation process of the unit output capacity reduction loss includes:

[0131] Step 4011: Calculate the power generation reduction of the unit due to each ton of industrial steam supply based on the reheat steam flow rate, steam desuperheating water spray ratio, and the average enthalpy of reheat steam in the test results;

[0132] The specific calculation process is:

[0133] Firstly, according to the ratio of reheat steam flow rate to steam desuperheating water flow rate in the test results, the amount of reheat steam consumed per ton of industrial steam supply is calculated;

[0134] Then calculate the difference between the average enthalpy of the hot steam and the exhaust enthalpy of the low-pressure cylinder of the unit (design value);

[0135] Finally, according to the calculation formula for the unit's reduced power generation due to each ton of industrial steam supply, the unit's reduced power generation due to each ton of industrial steam supply is calculated. Among them, the calculation formula for the unit's reduced power generation due to each ton of industrial steam supply is: the unit's reduced power generation due to each ton of industrial steam supply = (reheat steam volume × enthalpy difference) / mechanical efficiency / generator efficiency / 3600.

[0136] Step 4012: Considering that power generation loss will only occur when the grid load rate is high, this cost accounting assumes that this loss will occur when the unit load rate is greater than the set threshold, such as 80% of the rated capacity. When it is lower than 80%, the unit load is not affected by industrial steam supply.

[0137] Step 4013: According to the settlement sheet provided by the power plant, the probability that the load rate of the units in the spot market for the whole year is greater than 80% of the rated capacity is calculated, for example, 90%, and the profitable electricity price of the load segment corresponding to 80%-90% of the rated capacity in the spot market is determined;

[0138] Step 4014: Calculate the power generation loss cost caused by each ton of industrial steam supply by combining the power generation reduction per ton of industrial steam supply, the probability that the unit load factor is greater than THA, and the product of the profitable electricity price of the load section.

[0139] Step 402: The calculation process of the unit start-stop benefit loss includes:

[0140] According to the conclusion of spot market operation, when the power supply exceeds the demand, the unit electricity price will be significantly lower than the cost price. At this time, the unit should choose to shut down to avoid losses. However, due to industrial steam supply, the unit cannot choose to shut down, resulting in loss of operating benefits.

[0141] Step 4021: Calculate the power generation cost of each load section according to the unit power generation coal consumption rate as a result of the test;

[0142] Specifically, the cost of each kilowatt-hour of electricity put online is calculated by multiplying the unit's coal consumption rate under various operating conditions by the current standard coal price.

[0143] Step 4022: When the power generation cost of each load segment is less than the transaction price, there is a downtime opportunity loss;

[0144] The calculation method is: first calculate the difference between the power generation cost per unit time and the on-grid electricity price, then multiply the downtime by the rated capacity, that is, calculate the power generation based on the rated capacity per unit time, and finally combine the product of the difference between the power generation cost per unit time and the on-grid electricity price and the power generation, which is the loss of this downtime opportunity.

[0145] Step 4023: Considering that starting and stopping the unit requires time and money, it is impossible to consider shutting down the unit during every period of negative revenue to reduce operating losses.

[0146] The specific shutdown opportunity loss for peak load regulation should be considered. The shutdown opportunity loss will only occur when it is greater than the startup cost. This cost accounting believes that this loss will occur when the unit shutdown opportunity loss is greater than the set threshold, such as 300,000 (taking 300MW units as an example). The loss is the difference between the shutdown opportunity loss and the startup cost; the shutdown opportunity loss of units below 300,000 will not be affected.

[0147] Step 5: Calculate the electricity cost and other financial costs of the steam plant;

[0148] The calculation method of electricity cost of steam supply plant is:

[0149] The electricity consumption of the steam supply plant is calculated by multiplying the heat supply ratio by the total electricity consumption of the plant. The electricity consumption of the steam supply plant is shared by the computer group to calculate the electricity cost per ton of the steam supply plant.

[0150] Other financial cost calculation methods are:

[0151] Industrial steam supply leads to an increase in other financial costs such as the cost of purchasing power for the units, water costs, material costs, public system maintenance costs, and increased labor intensity of personnel. The above costs should be apportioned and reflected in the steam supply cost.

[0152] When calculating cost sharing, first calculate the steam supply ratio according to the ratio of steam supply coal consumption to the total coal consumption of the plant, and then calculate the capacity ratio according to the ratio of unit capacity to the proportion of all operating units in the plant. Multiply each cost by the capacity ratio and steam supply ratio in turn to get the unit steam supply sharing cost, and further calculate the unit steam sharing amount.

[0153] Step 7: Calculate the total cost of industrial steam supply based on fuel cost, loss of unit output capacity reduction, loss of unit start-up and shutdown benefits, power consumption of steam supply plant and other financial costs;

[0154] In this embodiment, the total cost of industrial steam supply per unit of a 300,000-level unit is calculated, and the specific results are listed in Table 6.

[0155] Table 6 Total cost of industrial steam supply for a unit

[0156]

[0157] Step 7: Calculate the steam selling price according to the current standard coal price and the required increase in revenue and profit; at the same time, the steam selling price can also be adjusted in time according to the current standard coal price to ensure that the steam supply of the unit is in a profitable state.

[0158] Embodiment 2

[0159] This embodiment provides a system for determining the industrial steam supply production cost of a heating unit, including:

[0160] An operation boundary determination module is used to obtain the thermal performance data of the unit under various operating conditions, draw the industrial steam supply condition diagram of the corresponding unit based on the thermal performance data of the unit under various operating conditions, and determine the unit operation boundary restriction conditions;

[0161] A test data calculation module is used to restrict the unit based on the unit operation boundary restriction conditions, and obtain the thermal performance test data of the unit under various working conditions through the obtained unit data calculation;

[0162] The cost calculation module is used to calculate the unit's external gas supply coal consumption cost and the steam supply plant electricity cost based on the unit's thermal performance test data under various operating conditions; calculate the unit's output capacity reduction loss and unit start-up and shutdown benefit loss in combination with the unit's thermal performance test data under various operating conditions and the spot market operation rules; and calculate the total industrial gas supply cost by combining the unit's external gas supply coal consumption cost, the steam supply plant electricity cost, the unit's output capacity reduction loss, the unit start-up and shutdown benefit loss, the steam supply plant electricity cost and other financial costs.

[0163] Embodiment 3

[0164] This embodiment provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps in the method for determining the industrial steam supply production cost of a heating unit as described above are implemented.

[0165] Embodiment 4

[0166] This embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps in the method for determining the industrial steam supply production cost of a heating unit as described above are implemented.

[0167] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0168] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0169] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0170] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0171] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and when the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

[0172] The above description is only a preferred embodiment of the present invention and is 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. A method for determining the production cost of industrial steam supply for a heating unit, characterized in that: The steps include: Obtain the thermal performance data of the unit under various operating conditions, draw the industrial steam supply condition diagram of the corresponding unit based on the thermal performance data of the unit under various operating conditions, and determine the boundary restriction conditions of the unit operation; The unit is restricted based on the unit operation boundary restriction conditions, and the thermal performance test data of the unit under various operating conditions is calculated through the acquired unit data; Based on the thermal performance test data of the unit under various working conditions, the coal consumption cost of the unit's external gas supply and the electricity cost of the steam plant are calculated; Combining the thermal performance test data of the unit under various operating conditions and the spot market operation rules, the unit output capacity reduction loss and the unit start-up and shutdown benefit loss are calculated; The total cost of industrial gas supply is calculated by combining the unit's coal consumption cost for external gas supply, the steam plant's electricity cost, the unit's output capacity reduction loss, the unit's start-up and shutdown benefit loss, the steam plant's electricity cost and other financial costs.

2. A method for determining the production cost of industrial steam supply for a heating unit according to claim 1, characterized in that: The thermal performance data of the unit under various operating conditions include the unit pure condensation test, 50%, 60%, 75% electric load and different industrial steam supply conditions test data and different industrial steam supply conditions test data under the maximum continuous evaporation capacity of the boiler.

3. The method for determining the production cost of industrial steam supply of a heating unit according to claim 1, characterized in that: The operating boundary constraints of the unit include the maximum evaporation capacity of the boiler and the maximum industrial steam supply capacity.

4. A method for determining the production cost of industrial steam supply for a heating unit according to claim 1, characterized in that: The calculation methods for the unit's external steam and coal consumption costs under various operating conditions include: The unit's power generation coal consumption rate under steam supply conditions is determined by multiplying the unit's power generation coal consumption rate under the same electrical load under pure condensing conditions by the coal consumption correction factor caused by the decrease in cylinder efficiency; Calculate the unit's coal consumption for power generation based on the unit's coal consumption rate under steam supply conditions; The total coal consumption of the unit minus the coal consumption of the unit for power generation is the coal consumption of the unit for external steam supply; The unit's external steam and coal consumption cost is calculated based on the unit's external steam and coal consumption and the unit price of coal.

5. The method for determining the production cost of industrial steam supply of a heating unit according to claim 1, characterized in that: The method for calculating the electricity cost of the steam supply plant is to convert the electricity consumption of the steam supply plant by multiplying the heat supply ratio by the total electricity consumption of the plant, calculate the electricity consumption of the steam supply plant by the computer group, and convert the electricity cost of the steam supply plant per ton.

6. A method for determining the production cost of industrial steam supply for a heating unit according to claim 1, characterized in that: The calculation process of the unit output capacity reduction loss includes: According to the reheat steam flow rate and desuperheating water spray ratio and the average enthalpy of reheat steam in the test results, the power generation reduction of the unit due to each ton of industrial steam supply is converted; Count the probability that the load factor of the units in the spot market is greater than the set threshold throughout the year, and determine the profitable electricity price in the load segment; The power generation loss cost caused by each ton of industrial steam supply is calculated by combining the power generation reduction of the unit due to each ton of industrial steam supply, the probability that the operating unit load is greater than the set threshold, and the product of the profitable electricity price of the load section; the calculation process of the unit start-up and shutdown benefit loss includes: Calculate the power generation cost of each load section based on the unit power generation coal consumption rate in the test results; When the power generation cost of each load segment is less than the transaction price, calculate the downtime opportunity loss; When the downtime opportunity loss is greater than the startup cost, the unit start-up and shutdown benefit loss is calculated based on the difference between the downtime opportunity loss and the startup cost.

7. A method for determining the production cost of industrial steam supply for a heating unit according to claim 1, characterized in that: After obtaining the total cost of industrial gas supply, calculate the selling price of gas according to the current standard coal price and the required increase in revenue and profit.

8. A system for determining the production cost of industrial steam supply for a heating unit, characterized in that: include: An operation boundary determination module is used to obtain the thermal performance data of the unit under various operating conditions, draw the industrial steam supply condition diagram of the corresponding unit based on the thermal performance data of the unit under various operating conditions, and determine the unit operation boundary restriction conditions; A test data calculation module is used to restrict the unit based on the unit operation boundary restriction conditions, and obtain the thermal performance test data of the unit under various working conditions through the obtained unit data calculation; A cost calculation module is used to calculate the unit's external gas supply coal consumption cost and the steam supply plant electricity cost based on the unit's thermal performance test data under various operating conditions; calculate the unit's output capacity reduction loss and unit start-up and shutdown benefit loss in combination with the unit's thermal performance test data under various operating conditions and the spot market operation rules; and calculate the total industrial gas supply cost by combining the unit's external gas supply coal consumption cost, the steam supply plant electricity cost, the unit's output capacity reduction loss, the unit start-up and shutdown benefit loss, the steam supply plant electricity cost and other financial costs.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of a method for determining the production cost of industrial steam supply for a heating unit as described in any one of claims 1 to 7 are implemented.

10. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps in the method for determining the industrial steam supply production cost of a heating unit according to any one of claims 1-7 are implemented.

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