A waste power plant steam flow distribution method, system, terminal and medium

Abstract

The application relates to a garbage power plant steam flow distribution method, system, terminal and medium, and relates to the garbage power generation technical field.The method comprises the following steps: acquiring steam supply parameters of steam input by a steam source; acquiring inlet steam parameters corresponding to a back pressure unit and an extraction condensing unit, and determining a basic distribution ratio of the steam input by the steam source between the two; supplying steam according to the basic distribution ratio; acquiring output parameters of the back pressure unit and heat supply main pipe requirements, and determining a target heat supply flow; adjusting the steam distribution ratio according to the difference between the target heat supply flow and the output flow of the back pressure unit, increasing the inlet flow of the back pressure unit or controlling the extraction of compensation steam by the extraction condensing unit when the heat supply capacity of the back pressure unit is insufficient; and reducing the inlet flow of the back pressure unit and increasing the inlet flow of the extraction condensing unit when the heat supply requirement is reduced.The application can improve the problem that the steam flow distribution between the back pressure unit and the extraction condensing unit in the existing garbage power plant is fixed, it is difficult to adapt to the change of the heat supply requirement, and the heat supply steam supply and the actual requirement are not matched.

Description

Technical Field

[0001] This application relates to the field of waste-to-energy technology, and in particular to a method, system, terminal and medium for steam flow distribution in a waste-to-energy plant. Background Technology

[0002] Waste-to-energy incineration generates heat by burning waste, and then uses waste heat boilers to convert feedwater into steam, which is then converted into energy by turbine units to achieve both power generation and heating. Currently, waste-to-energy incineration plants commonly employ combined heat and power (CHP) mode, operating in conjunction with back-pressure turbine generator units (back-pressure units) and extraction condensing turbine generator units (extraction condensing units). The steam input is used for both power generation and heating. The back-pressure unit primarily handles heating, while the extraction condensing unit can generate electricity while meeting heating demands. This combined configuration has become a common operating mode for waste-to-energy incineration plants.

[0003] In existing technologies, back-pressure units and extraction condensing units typically distribute steam according to preset operating parameters, such as setting a fixed steam supply ratio based on the unit's rated operating conditions, or formulating corresponding adjustment strategies based on historical operating data; some systems use single parameters such as steam pressure to provide feedback control of the unit's operating status.

[0004] However, existing steam distribution methods are usually based on fixed operating strategies and lack the ability to adjust the steam distribution relationship between back pressure units and extraction condensing units according to changes in actual heating demand. This can easily lead to insufficient heating steam supply or unreasonable steam utilization when heating demand changes. Summary of the Invention

[0005] To address the problem of fixed steam flow distribution between back-pressure turbines and extraction condensing turbines in existing waste-to-energy plants, which makes it difficult to adapt to changes in heating demand and leads to a mismatch between the supply of heating steam and actual demand, this application provides a steam flow distribution method, system, terminal, and medium for waste-to-energy plants.

[0006] In a first aspect, this application provides a method for distributing steam flow in a waste-to-energy plant, employing the following technical solution: A method for distributing steam flow in a waste-to-energy plant includes: Obtain the steam supply parameters of the steam source input; Obtain the first steam inlet parameters corresponding to the back pressure unit and the second steam inlet parameters corresponding to the extraction condensing unit; Based on the steam supply parameters, the first steam inlet parameters, and the second steam inlet parameters, determine the basic distribution ratio of the steam source input between the back pressure unit and the extraction condensing unit; Steam is supplied to the back pressure unit and the extraction condensing unit according to the basic allocation ratio; The first output parameters of the steam after passing through the back pressure unit are obtained, wherein the first output parameters include the first output pressure and the first output flow rate; Obtain the heating demand of the main heating pipe and determine the target heating flow rate based on the heating demand; Determine whether the target heating flow rate is greater than the first output flow rate; If it is greater than the target heating flow rate, then obtain the heating difference between the target heating flow rate and the first output flow rate; When the heating difference is not greater than the increaseable heating flow of the back pressure unit, the basic allocation ratio is adjusted according to the increaseable heating flow to increase the steam flow of the back pressure unit and simultaneously reduce the steam flow of the extraction condensing unit. When the heating difference is greater than the increaseable heating flow of the back pressure unit, the heating flow gap is determined based on the difference between the heating difference and the increaseable heating flow. Based on the heating flow gap, the extraction condensing unit is controlled to extract compensating steam from the extraction steam position corresponding to the heating pressure in the heating demand and deliver it to the heating main pipe. If the target heat supply flow rate is not greater than the target flow rate, the basic allocation ratio will be adjusted according to the target heat supply flow rate to reduce the steam inlet flow rate of the back pressure unit and increase the steam inlet flow rate of the extraction condensing unit.

[0007] By adopting the above technical solution, the steam distribution relationship between the back pressure unit and the extraction condensing unit is dynamically adjusted according to changes in heating demand, so that the heating steam supply can be adaptively adjusted according to changes in actual heating demand. When the back pressure unit has the heating compensation capability, the steam supply status of the back pressure unit is adjusted first. When the back pressure unit cannot meet the heating demand, the extraction condensing unit is used for compensation, thereby ensuring that the steam supply of the heating header meets the demand and improving the problem of insufficient heating steam supply or mismatch in distribution when heating demand changes due to the fixed steam distribution method in the existing system.

[0008] Optionally, historical heating flow data within a preset time period can be obtained; Based on historical heating flow data, identify the trend and random fluctuation characteristics of heating flow. Based on the characteristics of trend changes, determine whether the heating demand in the future preset period will show a continuous upward or downward trend; When a continuous upward or downward trend is determined, the trend advance correction amount is calculated based on the characteristics of the trend change. The heating flow rate is updated in advance based on the trend advance correction amount to obtain the advance target heating flow rate, and the advance target heating flow rate is used as the target heating flow rate. When it is determined that there is no continuous upward or downward trend, the fluctuation confidence interval is calculated based on the random fluctuation characteristics. Determine whether the current change in the target heating flow rate is within the fluctuation confidence interval; When the fluctuation confidence interval is within the range, the current change is determined to be an instantaneous random disturbance, and the target heating flow rate is updated with a delay, maintaining the heating flow rate of the previous moment as the target heating flow rate. When the target heating flow rate is not within the fluctuation confidence interval, it is updated based on the current change, and the updated heating flow rate is used as the target heating flow rate.

[0009] By adopting the above technical solution, the trend of heating demand changes can be identified based on historical heating flow data, and the target heating flow can be adjusted in advance when the heating demand continues to change. This allows the back pressure unit and the extraction condensing unit to adjust the steam distribution in advance before the actual heating demand changes. At the same time, by identifying random fluctuations and judging whether the current change is within the normal fluctuation range, the frequent adjustment of the target heating flow caused by instantaneous disturbances can be avoided, thereby improving the timeliness and stability of heating control.

[0010] Optionally, obtain the heating flow rate data within a preset calibration time period before the current moment to obtain the current heating flow rate change sequence; Based on the time range corresponding to the current heating flow change sequence, match multiple historical heating flow change sequences corresponding to the same time range in the historical heating flow data; Calculate the trend similarity between the current heating flow rate change sequence and each historical heating flow rate change sequence; Based on the trend similarity of multiple historical heating flow change sequences, a target historical heating flow change sequence that matches the current heating flow change sequence is determined. Obtain the subsequent heating flow trend characteristics after the corresponding time range of the target historical heating flow change sequence; Determine whether the trend change direction corresponding to the subsequent heating flow trend characteristics is consistent with the trend change direction corresponding to the current heating flow change sequence; If they are consistent, the heating demand trend in the future preset period is determined based on the subsequent heating flow trend characteristics corresponding to the target historical heating flow change sequence. When the trend of subsequent heating flow is continuously increasing, it is determined that the heating demand in the future preset period will show a continuous upward trend. When the trend of subsequent heating flow rate is continuously decreasing, it is determined that the heating demand in the future preset period will show a continuous downward trend. If they are inconsistent, the current change in heating demand is determined to be a random fluctuation.

[0011] By adopting the above technical solution, the current heating flow rate change process is matched with similar historical change processes. The subsequent change trends corresponding to similar historical operating conditions are used to predict the future direction of heating demand changes. This makes the judgment of heating demand trends more consistent with actual operating rules and provides a predictive basis before heating demand undergoes continuous changes, thereby improving the advance and accuracy of heating flow rate adjustments. At the same time, by judging whether the current change process is consistent with the historical change process, random fluctuations can be identified, reducing the impact of irregular fluctuations on heating control.

[0012] Optionally, obtain the current pipe wall temperature of the extraction steam pipeline of the extraction condensing unit; Determine whether the current pipe wall temperature is lower than the preset cold idle threshold; If so, the extraction steam pipeline is determined to be in a cold idle state, and the extraction condensing unit is controlled to introduce pulse steam into the extraction steam pipeline with a preset pulse flow rate and preset pulse duration. Obtain parameters showing changes in pipeline humidity after pulsed steam is introduced; The humidity change parameters of the pipeline are compared with the waterless baseline response of the extraction steam pipeline under the condition of no water accumulation. Based on the comparison results, it is determined whether there is condensate accumulation in the extraction steam pipeline. If there is no condensate accumulation, the extraction condensing unit will execute the conventional pipe warm-up process, and then extract compensating steam from the extraction steam position of the corresponding pressure level and deliver it to the heating main pipe. If condensation accumulates, the preset water treatment process will be executed.

[0013] By adopting the above technical solution, the condition of the extraction steam pipeline is detected before the extraction condensing unit performs heat compensation, and it is possible to identify whether there is condensate accumulation in the extraction steam pipeline. This avoids water hammer caused when high-pressure steam enters the water-containing pipeline, reducing safety risks such as pipeline vibration and equipment damage. At the same time, the corresponding treatment method is determined based on the detection results, so that the extraction steam pipeline can meet the conditions for compensation steam transportation and improve the reliability of heat compensation of the extraction condensing unit.

[0014] Optionally, the execution of the preset water accumulation treatment process includes: Determine the target warm-up extraction steam level from the extraction steam pressure levels corresponding to the extraction condensing unit; The extraction condensing unit controls the steam to be introduced into the extraction pipeline at a preset steam flow rate from the extraction position corresponding to the target steam extraction level. After the warming steam enters the extraction steam pipe, the discharge channel on the outlet side of the extraction steam pipe is closed, so that the warming steam remains in the extraction steam pipe for a preset shut-off time. After the preset pipe shut-off time is reached, the discharge channel on the outlet side of the extraction steam pipe is opened to increase the flow rate of warming steam and allow the warming steam to purge the extraction steam pipe. During the purging process, update the pipeline humidity change parameters until the conditions for steam extraction recovery are met.

[0015] By adopting the above technical solution, the extraction steam pipeline is heated by selecting warm-pipe steam at a pressure level higher than the target heating pressure, which causes the residual condensate in the pipeline to quickly absorb heat and vaporize. The vaporized water vapor is then discharged through the pipe sealing and purging process, reducing the impact of water accumulation in the extraction steam pipeline on the subsequent steam extraction process. At the same time, the water accumulation status is judged based on the changes in pipeline humidity, so that the extraction steam pipeline can be put into heating compensation after meeting the recovery conditions, thereby improving the safety and reliability of the extraction condensing unit's compensation heating.

[0016] Optionally, the flow guiding mechanism at the inlet of the extraction steam pipe can be controlled to adjust the direction of the warm-up steam entering the pipe, so that the warm-up steam deflects relative to the axis of the extraction steam pipe. Warming steam is introduced into the extraction pipe according to the deflected entry direction, so that the warming steam forms a spiral flow that rotates and moves along the pipe wall inside the extraction pipe.

[0017] By adopting the above technical solution, by adjusting the direction of the warming steam entering the extraction steam pipe, the warming steam forms a spiral flow that rotates and moves along the pipe wall inside the pipe, increasing the contact range between the warming steam and the pipe wall and condensate, improving the heating and vaporization efficiency of the condensate, and enhancing the ability to carry and discharge the water adhering to the pipe wall, thereby improving the water accumulation treatment effect of the extraction steam pipe.

[0018] Optionally, the extraction condensing unit can be controlled to input warm-up steam into the extraction steam pipeline according to a preset pulse cycle; Acquire the pipeline pressure change parameters and pipeline humidity change parameters corresponding to each pulse input process; Determine the swirl enhancement requirements for the current purging stage based on pipeline pressure and humidity variation parameters. Gradually increase the steam input flow rate in subsequent pulse cycles according to the swirl enhancement requirements; While increasing the steam input flow rate, the tangential velocity of the warm-up steam entering the extraction steam pipe is increased, so that the spiral flow velocity in the extraction steam pipe increases gradually. When the humidity change parameter in the pipeline is lower than the preset humidity threshold, the current pulse input parameter is maintained to complete the steam extraction pipeline purging.

[0019] By adopting the above technical solution, the swirling enhancement requirement is dynamically judged based on the pipeline pressure and humidity change parameters during the purging process, and the steam input flow rate and tangential velocity are gradually adjusted. This allows the swirling flow intensity in the extraction pipeline to gradually increase as the accumulated water is removed, thereby improving the effect of the warming steam on the pipe wall and residual condensate. At the same time, the current purging parameters are maintained after the humidity parameters meet the preset conditions to avoid over-purging.

[0020] Secondly, this application provides a steam flow distribution system for a waste-to-energy plant, employing the following technical solution: A steam flow distribution system for a waste-to-energy plant includes: The acquisition module is used to acquire steam supply parameters, first steam inlet parameters, second steam inlet parameters, first output parameters, and heating demand. A memory for storing the program for the steam flow distribution method of the waste-to-energy plant; The processor and the program in the memory can be loaded and executed by the processor to implement the steam flow distribution method of the waste-to-energy plant.

[0021] By adopting the above technical solution, the steam distribution relationship between the back-pressure unit and the extraction condensing unit is dynamically adjusted according to changes in heating demand, so that the heating steam supply can be adaptively adjusted according to changes in actual heating demand. When the back-pressure unit has the heating compensation capability, the steam supply status of the back-pressure unit is adjusted first. When the back-pressure unit cannot meet the heating demand, the extraction condensing unit is used for compensation, thereby ensuring that the steam supply of the heating header meets the demand and solving the problem of insufficient heating steam supply or mismatch in distribution when heating demand changes due to the fixed steam distribution method in the existing system.

[0022] Thirdly, this application provides a smart terminal, which adopts the following technical solution: A smart terminal includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of the above methods.

[0023] Fourthly, this application provides a computer storage medium capable of storing corresponding programs, which facilitates the improvement of the problem in existing waste-to-energy plants where the steam flow distribution between back-pressure units and extraction condensing units is fixed and difficult to adapt to changes in heating demand, resulting in a mismatch between the supply of heating steam and the actual demand. The technical solution adopted is as follows: A computer-readable storage medium storing a computer program that can be loaded by a processor and executed any of the above-described methods for distributing steam flow in a waste-to-energy plant.

[0024] In summary, this application includes at least one of the following beneficial technical effects: The steam distribution relationship between the back-pressure turbine and the extraction condensing turbine is dynamically adjusted according to changes in heating demand, so that the heating steam supply can be adaptively adjusted according to changes in actual heating demand. When the back-pressure turbine has heating compensation capability, the steam supply status of the back-pressure turbine is adjusted first. When the back-pressure turbine cannot meet the heating demand, the extraction condensing turbine is used for compensation, thereby ensuring that the steam supply of the heating header meets the demand and improving the problem of insufficient heating steam supply or mismatch in distribution when heating demand changes due to the fixed steam distribution method in the existing system. Based on historical heating flow data, the trend of heating demand changes is identified, and the target heating flow is adjusted in advance when the heating demand continues to change. This allows the back-pressure unit and the extraction condensing unit to adjust the steam distribution in advance before the actual heating demand changes. At the same time, by identifying random fluctuations and judging whether the current change is within the normal fluctuation range, the target heating flow is avoided from being frequently adjusted due to instantaneous disturbances, thereby improving the timeliness and stability of heating control. Before the extraction condensing unit performs heat compensation, the condition of the extraction steam pipeline is inspected to identify whether there is condensate accumulation in the extraction steam pipeline. This avoids water hammer caused when high-pressure steam enters water-containing pipelines, reducing safety risks such as pipeline vibration and equipment damage. At the same time, the corresponding treatment method is determined based on the inspection results to ensure that the extraction steam pipeline can meet the conditions for compensation steam delivery and improve the reliability of heat compensation of the extraction condensing unit. Attached Figure Description

[0025] Figure 1 This is a schematic flowchart of a steam flow distribution method for a waste-to-energy plant according to an embodiment of this application.

[0026] Figure 2 This is a flowchart illustrating a target heating flow rate update method in an embodiment of this application.

[0027] Figure 3 This is a flowchart illustrating a change verification method in an embodiment of this application.

[0028] Figure 4 This is a schematic flowchart of a condensate removal method according to an embodiment of this application.

[0029] Figure 5 This is a schematic flowchart of a preset water accumulation treatment method in an embodiment of this application.

[0030] Figure 6 This is a schematic flowchart of a purging method according to an embodiment of this application.

[0031] Figure 7 This is a flowchart illustrating a purging and adjustment method according to an embodiment of this application. Detailed Implementation

[0032] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1 To be continued Figure 7 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0033] This application discloses a method for steam flow distribution in a waste-to-energy plant. (Refer to...) Figure 1 Steam flow distribution methods for waste-to-energy plants include: Step S101: Obtain the steam supply parameters of the steam source input steam.

[0034] Steam input refers to the steam generated during the waste incineration process that heats the feedwater. This steam serves as the initial energy input for both the back pressure unit and the extraction condensing unit.

[0035] Steam supply parameters refer to data used to characterize the steam supply status of the steam source, including steam pressure and total steam flow rate. Steam pressure reflects the steam pressure level, and steam flow rate reflects the amount of steam supplied by the steam source per unit time.

[0036] Steam supply pressure refers to the pressure value of steam at the output end of the steam source, which is used to determine the pressure level corresponding to the input steam.

[0037] Total steam supply flow refers to the total steam flow provided by the steam source to the downstream equipment, which reflects the total amount of steam that can be allocated by the current steam source.

[0038] For example, when the waste incineration boiler is operating stably, the steam pressure in the steam source output pipeline is maintained at 5 MPa, and the total steam supply flow rate is 100 t / h. The controller detects the current steam supply pressure as 5 MPa through the pressure transmitter and the current total steam supply flow rate as 100 t / h through the steam flow meter.

[0039] At this point, the controller uses "5MPa, 100t / h" as the current steam supply parameters for the steam source input, and further determines the steam distribution strategy for the subsequent back pressure unit and extraction condensing unit based on these parameters.

[0040] Step S102: Obtain the first steam inlet parameters corresponding to the back pressure unit and the second steam inlet parameters corresponding to the extraction condensing unit.

[0041] The first steam inlet parameter refers to the basic steam inlet demand parameter corresponding to the operation of its own control logic, which is used to represent the steam pressure and steam flow required by the back pressure unit under default conditions.

[0042] The second steam inlet parameter refers to the basic steam inlet demand parameter corresponding to its own control logic operation, which is used to represent the steam pressure and steam flow required by the extraction condensing unit under default conditions.

[0043] The system pre-stores the basic steam inlet requirements parameters corresponding to the back-pressure turbine and the extraction condensing turbine. When the steam source distribution control is executed, the controller reads the pre-stored basic steam inlet parameters corresponding to the back-pressure turbine and uses them as the first steam inlet parameter; at the same time, it reads the pre-stored basic steam inlet parameters corresponding to the extraction condensing turbine and uses them as the second steam inlet parameter.

[0044] Step S103: Determine the basic distribution ratio of steam input from the steam source between the back pressure unit and the extraction condensing unit based on the steam supply parameters, the first steam inlet parameters, and the second steam inlet parameters.

[0045] The basic allocation ratio refers to the initial allocation relationship of the steam supply parameters of the steam source input between the back pressure unit and the extraction condensing unit before dynamic adjustment based on real-time heating demand. It is used to determine the basic steam supply of the two units.

[0046] For example, the total steam supply flow rate of the steam source input is 100t / h.

[0047] In the preset first steam inlet parameters, the basic required flow rate for the back pressure unit is 50t / h.

[0048] In the preset second steam inlet parameters, the basic required flow rate for the extraction condensing unit is 50t / h.

[0049] The controller calculates: Demand percentage for back pressure units: 50 ÷ (50 + 50) = 50%. Demand percentage for extraction condensing units: 50 ÷ (50 + 50) = 50%.

[0050] Therefore, the basic steam allocation ratio for the steam source input is determined as: back pressure unit: extraction condensing unit = 1:1.

[0051] The subsequent controller allocates steam to the two units based on this basic allocation ratio, and further adjusts the allocation ratio when heating demand changes.

[0052] Step S104: Supply steam to the back pressure unit and the extraction condensing unit according to the basic distribution ratio.

[0053] The controller adjusts the distribution valves on the steam source output pipeline so that the high-pressure steam input from the steam source enters the back pressure unit and the extraction condensing unit respectively according to the basic distribution ratio.

[0054] The steam entering the back pressure unit expands and does work inside the turbine. The steam pressure is reduced from the input pressure of the steam source to the pressure level required for heating. At the same time, the pressure difference released is used to drive the turbine to rotate and generate electricity, and the reduced-pressure steam is output to the heating main pipe.

[0055] The steam entering the extraction condensing unit expands and does work inside the turbine, converting the steam's thermal energy into electrical energy, and retaining extraction steam capacity according to subsequent heating demand.

[0056] Through the above steam supply process, both the back-pressure unit and the extraction condensing unit are established in a basic operating state, providing an operational basis for subsequent steam regulation based on heating demand.

[0057] For example, the steam input pressure is 5MPa and the total steam supply flow rate is 100t / h.

[0058] The controller controls the steam distribution valve group according to the basic distribution ratio, delivering part of the steam to the back pressure unit and the remaining steam to the extraction condenser unit.

[0059] The steam entering the back-pressure unit has a pressure of 5 MPa. After expansion and work within the back-pressure unit, the steam pressure drops to approximately 1 MPa and is then output to the heating main pipe at a pressure of 1 MPa. During this process, the pressure energy between 5 MPa and 1 MPa is converted into mechanical energy to drive the generator to generate electricity.

[0060] The steam pressure entering the extraction condensing unit is also 5MPa. The steam expands and does work through the turbine stage, converting the energy in the steam into electrical energy, and outputs heating steam from the corresponding extraction position according to the heating demand.

[0061] Step S105: Obtain the first output parameters of steam after passing through the back pressure unit, wherein the first output parameters include the first output pressure and the first output flow rate.

[0062] The first output parameter refers to the steam state parameter of the steam source input steam after it expands and does work through the back pressure unit and is output by the back pressure unit to the heating main pipe side. It is used to characterize the heating steam capacity that the current back pressure unit can provide, including the first output pressure and the first output flow rate.

[0063] The first output pressure refers to the heating steam pressure after being depressurized by the back pressure unit, which is used to reflect the heating pressure level corresponding to the current output steam of the back pressure unit.

[0064] The first output flow rate refers to the amount of steam output from the back pressure unit to the heating header per unit time, which reflects the amount of heating steam that the current back pressure unit can provide.

[0065] After the steam source enters the back pressure unit, it expands and performs work inside the back pressure unit, reducing the steam pressure to the pressure level required by the heating header, for example, from 5MPa to 1MPa.

[0066] A first pressure detection module and a first flow detection module are installed on the heating steam pipeline connecting the back pressure unit outlet to the heating main pipe.

[0067] in: The first pressure detection module is used to detect the steam pressure at the outlet of the back pressure unit in real time. The first flow detection module is used to detect the steam flow rate at the outlet of the back pressure unit in real time.

[0068] The controller receives data from the two detection modules and uses the detected pressure value as the first output pressure and the detected flow rate value as the first output flow rate.

[0069] Step S106: Obtain the heating demand of the heating main pipe and determine the target heating flow rate based on the heating demand.

[0070] The heating main pipe refers to the pipeline that collects the exhaust steam from the back pressure unit and the extraction steam from the extraction condensing unit and distributes the steam to various downstream heat exchange stations.

[0071] Heating demand refers to the sum of steam flow and pressure required by downstream heat exchange stations.

[0072] By collecting steam flow rate and steam pressure data from the heating main pipe, as well as heat demand information from downstream heat exchange stations, the current heating demand is determined. Based on the acquired heating demand, the controller queries a preset heating demand mapping relationship to determine the target heating flow rate corresponding to the current heating demand.

[0073] The target heating flow rate represents the steam flow rate that the current heating header needs to deliver to the downstream heat exchange station, which is used to guide the steam supply adjustment of subsequent back-pressure units and extraction condensing units.

[0074] Step S107: Determine whether the target heating flow rate is greater than the first output flow rate.

[0075] The purpose of this judgment is to determine whether the current back pressure unit exhaust steam volume can meet the total downstream heating demand, thereby deciding whether it is necessary to increase the back pressure unit load or start the extraction condensing unit for steam extraction compensation.

[0076] Step S108: If it is greater than, then obtain the heating difference between the target heating flow rate and the first output flow rate.

[0077] The heating difference refers to the difference between the target heating flow rate and the first output flow rate.

[0078] The controller subtracts the first output flow from the target heating flow and calculates the difference between the two.

[0079] When the target heating flow rate is greater than the first output flow rate, it indicates that the amount of steam required by the current heating main pipe exceeds the amount of heating steam that the back pressure unit can provide, resulting in a heating flow rate gap. Further supplementation is needed by adjusting the steam intake of the back pressure unit or controlling the extraction steam of the extraction condenser unit.

[0080] When the target heat supply flow is less than or equal to the first output flow, it indicates that the current back pressure unit outputs enough steam to meet the heat supply demand. It is necessary to reduce the back pressure unit steam supply ratio and increase the power generation utilization ratio of the extraction condensing unit according to the heat supply demand.

[0081] Step S109: If the heating difference is not greater than the increaseable heating flow of the back pressure unit, adjust the basic distribution ratio according to the increaseable heating flow to increase the steam flow of the back pressure unit and simultaneously reduce the steam flow of the extraction condensing unit.

[0082] The increaseable heat supply flow rate refers to the upper limit of the exhaust steam flow rate that the back pressure unit can increase based on the current level.

[0083] When the heat supply difference is not greater than the increase in heat supply flow of the back pressure unit, it means that the current heat supply shortage can be compensated by increasing the steam supply of the back pressure unit, and there is no need to call the extraction condensing unit to extract steam for heat supply supplementation.

[0084] Since the total amount of steam input remains constant, while increasing the steam intake of the back-pressure unit, the corresponding steam intake of the extraction condensing unit is reduced, so that the steam input from the steam source is redistributed to the two units according to the adjusted distribution ratio.

[0085] During the adjustment process, back-pressure units are used first for heat compensation, so that the increased steam can be directly converted into heating steam after expanding and generating electricity in the back-pressure units, thereby improving heating efficiency.

[0086] Step S110: If the heating difference is greater than the increaseable heating flow of the back pressure unit, determine the heating flow gap based on the difference between the heating difference and the increaseable heating flow.

[0087] The heating flow gap refers to the remaining heating shortfall that cannot be met even after the back pressure unit is at full load.

[0088] When the heating deficit exceeds the additional heating flow rate of the back-pressure turbine, it indicates that the current heating shortage exceeds the self-regulating capacity of the back-pressure turbine, and simply increasing the steam flow into the back-pressure turbine cannot meet the demand of the heating mains. The controller first determines the maximum compensating heating capacity that the back-pressure turbine can provide, i.e., the additional heating flow rate. Then, it subtracts the additional heating flow rate of the back-pressure turbine from the current heating deficit to obtain the remaining heating deficit after compensation by the back-pressure turbine. This remaining heating deficit is used as the heating flow gap, and it serves as the basis for subsequent control of the extraction condensing turbine for steam extraction compensation. The calculation process can be expressed as: Heating flow gap = Heating deficit - Additional heating flow rate.

[0089] For example, the current demand for the main heating pipe is a target heating flow rate of 90t / h.

[0090] Current output of the back pressure unit: First output flow rate 60t / h.

[0091] The heating difference is 90t / h - 60t / h = 30t / h.

[0092] The maximum increase in heat supply flow for the current back pressure unit is 20t / h.

[0093] Since 30t / h > 20t / h, it indicates that the back-pressure unit cannot fully meet the heating demand.

[0094] The controller calculates a heating flow gap of 30t / h - 20t / h = 10t / h.

[0095] At this time, the controller first increases the steam intake of the back pressure unit to the maximum regulation state, thereby increasing its heating output by 20t / h; the remaining 10t / h heating demand is met by the extraction condensing unit extracting compensating steam through the extraction steam position of the corresponding pressure level and delivering it to the heating main pipe.

[0096] Step S111: Based on the heating flow gap, control the extraction condensing unit to extract compensating steam from the extraction steam position corresponding to the heating pressure in the heating demand and deliver it to the heating main pipe.

[0097] Pressure rating refers to the steam pressure state between different turbine stages within an extraction condensing turbine unit. During steam expansion, different extraction ports in the extraction condensing turbine unit correspond to different pressure ratings of steam, allowing the selection of the appropriate pressure rating for output based on heating demand.

[0098] The extraction steam position refers to the steam outlet located inside the turbine of the extraction condensing unit. Different extraction steam positions correspond to different steam pressure levels and are used to output compensating steam to meet different heating pressure requirements.

[0099] Compensating steam refers to steam that is additionally extracted by the extraction condensing unit and transported to the heating main pipe when the heating steam output of the back pressure unit cannot meet the target heating flow rate, in order to supplement the heating flow rate gap.

[0100] The controller acquires the heating flow gap and determines the required compensation steam pressure level based on the heating pressure corresponding to the heating demand. Since the extraction condensing turbine has multiple extraction steam locations with different pressure levels, and the output steam pressure varies at each location, the controller matches the corresponding extraction steam location to the target heating pressure. After determining the target extraction steam location, the controller opens the corresponding extraction steam regulating valve, allowing steam of the corresponding pressure level from within the extraction condensing turbine to enter the heating pipeline.

[0101] At the same time, the extraction steam flow rate is adjusted according to the heating flow gap to match the extraction compensation steam flow rate with the heating flow gap, and the compensation steam is delivered to the heating main pipe to meet the heating demand of the downstream heat exchange station together with the steam output from the back pressure unit.

[0102] For example, the steam input pressure is 5MPa and the total flow rate is 100t / h.

[0103] Current operating status: Back pressure unit outputs 60t / h of heating steam; target heating flow rate of 90t / h for the heating main pipe.

[0104] Therefore, the heating difference is 90t / h - 60t / h = 30t / h.

[0105] The current back pressure unit can increase the heat supply flow by 20t / h.

[0106] The back-pressure unit is unable to fully meet the increased heating demand at this time.

[0107] The controller calculates the heating flow gap as 30t / h - 20t / h = 10t / h.

[0108] Subsequently, the controller increases the steam flow rate into the back pressure unit, thereby increasing the heat output of the back pressure unit by 20t / h.

[0109] After adjustment, the back pressure unit outputs 80t / h of heating steam; the remaining heating flow gap is 10t / h.

[0110] Since the heating main pipe requires a heating pressure of 1MPa, the controller controls the extraction condensing unit to extract 10t / h of compensating steam from the extraction steam position corresponding to the 1MPa pressure level and deliver it to the heating main pipe.

[0111] The final heating main pipe output is: 80t / h (output of back pressure unit) + 10t / h (compensation of extraction condensing unit) = 90t / h.

[0112] This will meet the target heating flow requirements.

[0113] Step S112: If it is not greater than the target heat supply flow rate, the basic allocation ratio is adjusted according to the target heat supply flow rate to reduce the steam inlet flow rate of the back pressure unit and increase the steam inlet flow rate of the extraction condensing unit.

[0114] When the target heating flow rate is less than the first output flow rate, it means that the amount of heating steam output by the current back pressure unit is greater than the actual demand of the heating header. If the current steam source allocation ratio is maintained, the heating steam output by the back pressure unit will exceed the demand, resulting in excessively high pressure in the heating header and reducing the overall power generation efficiency.

[0115] Therefore, the controller determines the amount of steam that the back pressure unit needs to reduce based on the difference between the target heat supply flow and the first output flow.

[0116] Since the total amount of steam input remains constant, by reducing the steam flow rate of the back pressure unit and increasing the steam flow rate of the extraction condensing unit, the reduced steam can enter the extraction condensing unit to expand and do work, thereby improving the utilization rate of steam power generation.

[0117] This application provides a method for updating target heating flow rate, referring to... Figure 2 The method includes: Step S201: Obtain historical heating flow data within a preset time period.

[0118] The preset time period refers to the length of time that is set in advance for collecting historical data.

[0119] Historical heating flow data refers to the actual steam flow rate recorded by the heating main pipe during a past period.

[0120] The controller retrieves heating operation records from the historical operation database and determines the data query range based on a preset time period.

[0121] The heating flow data for each moment within the time period is extracted from the flow detection records corresponding to the heating main pipe and arranged in chronological order to form a historical heating flow data sequence.

[0122] Step S202: Based on historical heating flow data, identify the trend change characteristics and random fluctuation characteristics of heating flow.

[0123] First, the heating flow rate at multiple consecutive time points is fitted to calculate the overall slope of the heating flow rate change over time. The direction of the slope is used to determine whether the heating flow rate shows a continuous increasing or decreasing trend, and the corresponding direction and rate of change are used as trend change characteristics. Then, the actual heating flow rate data is compared with the trend fitting results to calculate the flow rate deviation at each time point. If the flow rate deviation varies within a certain range, this variation is identified as a random fluctuation characteristic, representing short-term disturbances in heating demand outside the overall trend. In this way, historical heating flow rate changes are decomposed into long-term trend changes and short-term random fluctuations, providing a basis for subsequently judging the type of future heating demand changes.

[0124] In actual operation, the heat demand of downstream heat exchange stations is affected by production plans, ambient temperature and user heat consumption behavior, resulting in both long-term variation patterns and short-term fluctuations in heat supply flow.

[0125] After acquiring historical heating flow data, the controller processes the data using time series analysis.

[0126] For example, select heating flow data for 10 consecutive days: If the heating flow rate gradually increases during the same time period each day, and maintains an increasing trend over multiple time periods, then a trend of continuous increase in heating flow rate can be identified. If the overall heating flow rate remains stable, but there are short-term increases at certain times before returning to the original value, then this change is identified as a random fluctuation.

[0127] Step S203: Based on the trend change characteristics, determine whether the heating demand in the future preset period will show a continuous upward or downward trend.

[0128] The future preset time period refers to a preset time range extending backward from the current moment, used to predict the changing trend of heating demand within that time range.

[0129] Specifically, the controller obtains the trend change direction corresponding to the current moment and determines whether the trend change direction remains consistent over multiple consecutive historical time periods.

[0130] When the trend change characteristics indicate that the heating flow rate continues to increase and the rate of increase reaches the preset continuous growth condition, it is predicted that the heating demand will continue to increase in the future preset period, and it is determined that the heating demand in the future preset period will show a continuous upward trend.

[0131] When the trend change characteristics indicate that the heating flow rate is continuously decreasing and the rate of decrease reaches the preset continuous decrease condition, it is predicted that the heating demand will continue to decrease in the future preset period, and it is determined that the heating demand in the future preset period will show a continuous downward trend.

[0132] If the direction of the trend changes frequently, or the magnitude of the change does not meet the preset duration condition, it will not be judged as a continuous upward trend or a continuous downward trend.

[0133] Step S204: When it is determined that there is a continuous upward or downward trend, calculate the trend advance correction amount based on the trend change characteristics.

[0134] Trend advance correction refers to the correction value that adjusts the current target heating flow rate in advance based on the trend of heating demand changes within a preset future period, so as to bring the target heating flow rate closer to the future heating demand in advance.

[0135] The controller uses the current heating flow rate as a benchmark and calculates the trend change rate with the time length corresponding to the preset future period to obtain the expected change value of heating flow rate.

[0136] Simultaneously, the direction of the trend-advancing correction is determined based on the direction of trend change: when heating demand shows a continuous upward trend, the expected increase in heating flow is used as the positive correction; when heating demand shows a continuous downward trend, the expected decrease in heating flow is used as the negative correction. Through this method, the controller can adjust the target heating flow in advance before the actual change in heating demand, reducing the response lag in the adjustment process of back-pressure units and extraction condensing units.

[0137] For example: The current heating flow rate is 60 t / h. Analysis of historical heating flow rate data shows that the heating flow rate has been continuously increasing over the past 10 minutes, with an average growth rate of 0.5 t / h per minute; the preset future time period is 20 minutes. Therefore, the controller calculates that the expected increase in the next 20 minutes is 0.5 × 20 = 10 t / h. Thus, the trend advance correction is determined to be +10 t / h.

[0138] Step S205: Update the heating flow rate in advance according to the trend advance correction amount to obtain the advance target heating flow rate, and use the advance target heating flow rate as the target heating flow rate.

[0139] The advanced target heating flow rate refers to the heating flow rate value obtained by adjusting the current target heating flow rate in advance according to the future heating demand trend. It is used to replace the current target heating flow rate so that the subsequent back pressure unit and extraction condensing unit can adjust the steam distribution in advance according to future demand.

[0140] The controller obtains the trend advance correction amount calculated in step S204, and adds the current target heating flow rate to the trend advance correction amount to obtain the advance target heating flow rate.

[0141] Step S206: When it is determined that there is no continuous upward or downward trend, calculate the fluctuation confidence interval based on the random fluctuation characteristics.

[0142] The fluctuation confidence interval refers to the normal fluctuation range of heating flow determined based on the random fluctuation characteristics in historical heating flow, and is used to determine whether the current change in heating flow belongs to a random disturbance in a short period of time.

[0143] The controller statistically analyzes the amplitude of random fluctuations in historical heating flow and calculates the fluctuation range based on multiple historical random fluctuation data. Specifically, the controller acquires the deviation of heating flow from the trend baseline value during random fluctuations, performs statistical analysis on multiple deviations, and obtains the distribution range of the random fluctuation amplitude. Then, based on a preset confidence level, it determines the normal random fluctuation range and uses this range as the fluctuation confidence interval.

[0144] For example, the overall heating demand may remain around 60t / h during a certain period, but due to valve adjustments at some heat exchange stations, the heating flow rate may change as follows: 68t / h → 62t / h → 69t / h → 61t / h.

[0145] The aforementioned changes did not form a sustained trend, but rather were random fluctuations.

[0146] Therefore, the controller performs statistical analysis based on the flow rate variation under similar historical operating conditions.

[0147] For example, in historical random fluctuation data: the maximum increase deviation is +5t / h; the maximum decrease deviation is -4t / h. Therefore, the controller determines the fluctuation confidence interval corresponding to the current heating flow rate as: current heating flow rate ± 5t / h. This interval is used to subsequently determine whether the change in the current heating flow rate belongs to normal random disturbances. A higher confidence level indicates a larger allowable range of historical random fluctuations.

[0148] Step S207: Determine whether the current change in the target heating flow rate is within the fluctuation confidence interval.

[0149] The purpose of this judgment is to distinguish whether the current change in heating flow rate is a normal random fluctuation or an actual change in heating demand that has exceeded the historical fluctuation range, thereby avoiding frequent adjustments to back pressure units and extraction condensing units due to normal fluctuations in a short period of time.

[0150] The controller obtains the change in the current target heating flow rate relative to the target heating flow rate at the previous moment, and compares the change with the fluctuation confidence interval calculated in step S206.

[0151] If the current change is within the confidence interval of the fluctuation, it indicates that the current change in heating flow conforms to the historical random fluctuation pattern, and it is judged as an instantaneous disturbance.

[0152] If the current change exceeds the confidence interval of the fluctuation, it means that the current change has exceeded the normal random fluctuation range, indicating that the heating demand may have changed in reality, and the target heating flow needs to be readjusted according to the current change.

[0153] Step S208: When the fluctuation confidence interval is within the range, the current change is determined to be an instantaneous random disturbance. The target heating flow rate is updated with a delay, and the heating flow rate of the previous moment is maintained as the target heating flow rate.

[0154] Instantaneous random disturbances refer to small changes in heat flow caused by local heat consumption changes and heat exchange station adjustments within a short period of time. These changes do not alter the overall trend of heat demand.

[0155] The heating flow rate at the previous moment refers to the heating flow rate value most recently determined and used for steam flow distribution control before the current moment.

[0156] The controller acquires the heating flow rate stored in the previous moment and continues to use this heating flow rate as the target heating flow rate for the current control cycle. At the same time, the controller continuously collects subsequent changes in heating flow rate, and readjusts the target heating flow rate when subsequent changes continue to exceed the fluctuation range.

[0157] By using the above methods, frequent adjustments to the steam intake of the back pressure unit and the steam extraction of the extraction condensing unit can be avoided due to short-term random fluctuations.

[0158] Step S209: When the target heating flow rate is not within the fluctuation confidence interval, update the target heating flow rate based on the current change and use the updated heating flow rate as the target heating flow rate.

[0159] When step S207 determines that the current change is not within the fluctuation confidence interval, it indicates that the current change in heating flow has exceeded the historical random fluctuation range, which is a situation where heating demand has changed.

[0160] The controller acquires the current change and corrects the target heating flow rate from the previous moment based on the current change. Specifically, the target heating flow rate from the previous moment is superimposed with the current change to obtain the updated heating flow rate, and the updated heating flow rate replaces the original target heating flow rate.

[0161] in: When the current change is positive, it indicates an increase in heating demand, and the target heating flow rate should be increased. When the current change is negative, it indicates that the heating demand has decreased, and the target heating flow rate has been reduced.

[0162] This application provides a change verification method, referring to... Figure 3 The method includes: Step S301: Obtain the heating flow rate data within the preset calibration time length before the current time to obtain the current heating flow rate change sequence.

[0163] The preset calibration time length refers to the historical time range that is pre-set for analyzing the current changes in heating demand, and is used to limit the data collection cycle for the analysis of changes in current heating flow.

[0164] The current heating flow change sequence refers to a set of multiple heating flow data collected consecutively before the current moment, arranged in chronological order.

[0165] The controller traces back a preset calibration time length based on the current time node, extracts the heating flow data at each sampling moment within that time range from the flow detection record corresponding to the heating main pipe, and sorts them according to the acquisition time to form the current heating flow change sequence.

[0166] Step S302: Based on the time range corresponding to the current heating flow change sequence, match multiple historical heating flow change sequences corresponding to the same time range in the historical heating flow data.

[0167] Historical heating flow change sequence refers to a data set formed by arranging heating flow data collected over a continuous time range during historical heating operation in chronological order, used to represent the change process of heating demand over a certain period of time in the past.

[0168] The same time range refers to a historical time interval with the same duration as the current heating flow change sequence. This is used to ensure that the current change process is consistent with the historical change process on the time scale, thereby improving the accuracy of subsequent trend matching.

[0169] The controller obtains the start and end times corresponding to the current heating flow rate change sequence and determines the duration of the current change process.

[0170] Then, the controller uses this time length as a matching condition to perform time window sliding matching in the historical heating flow data, sequentially extracting multiple historical heating flow data segments with the same time length as the current time, and arranging them in chronological order to form multiple historical heating flow change sequences.

[0171] By acquiring multiple historical change sequences with consistent time lengths, the current change in heating flow can be compared with the change process within the same historical period, providing a data basis for subsequently determining similar change patterns.

[0172] For example, if the current time is 10:30, the controller acquires the heating flow rate change sequence from 10:00 to 10:30. The time length corresponding to this change sequence is 30 minutes.

[0173] The controller searches for a data range that lasts for the same 30 minutes in the historical heating flow data, for example: 10:00 to 10:30 the previous day; The first three days, from 10:00 to 10:30; The first seven days are from 10:00 to 10:30.

[0174] Heat flow data within the aforementioned time ranges are extracted to form multiple historical heat flow change sequences.

[0175] Step S303: Calculate the trend similarity between the current heating flow rate change sequence and each historical heating flow rate change sequence.

[0176] Trend similarity refers to an evaluation parameter used to characterize the degree of similarity between two heating flow change sequences in terms of direction, magnitude, and rate of change.

[0177] Trend fitting is performed on the current heating flow rate change sequence and each historical heating flow rate change sequence to obtain the current change slope and the slope of each historical change slope. Then, the absolute difference between the current change slope and each historical change slope is calculated, and the trend similarity is obtained by converting the absolute difference with a preset mapping relationship. The smaller the absolute difference, the closer the current heating flow rate change trend is to the corresponding historical change trend, and the higher the trend similarity is.

[0178] In a feasible embodiment, the controller uses the least squares method to perform linear fitting on the current heating flow change sequence and each historical heating flow change sequence to obtain the change slope K0 corresponding to the current change sequence, and the change slopes K1, K2, K3...Kn corresponding to each historical change sequence.

[0179] Then, calculate the absolute difference between K0 and K1, K2, K3...Kn respectively: ΔKn=|K0-Kn| The controller converts the absolute difference into a trend similarity value based on a preset similarity conversion model. For example, the closer the absolute difference is to 0, the higher the corresponding trend similarity value is set; when the absolute difference exceeds a preset range, the corresponding trend similarity value is reduced.

[0180] Step S304: Based on the trend similarity of multiple historical heating flow change sequences, determine the target historical heating flow change sequence that matches the current heating flow change sequence.

[0181] The target historical heating flow change sequence refers to the historical data sequence that most closely resembles the current heating flow change sequence among multiple historical heating flow change sequences.

[0182] The controller acquires the trend similarity of multiple historical heating flow change sequences and compares each trend similarity with a preset similarity threshold. When a historical heating flow change sequence exists whose trend similarity meets the preset similarity threshold, the historical heating flow change sequence that meets the condition is determined as the target historical heating flow change sequence.

[0183] For example, the current heating flow rate change sequence corresponds to the heating flow rate change in the past 30 minutes, and the controller matches three sets of historical heating flow rate change sequences in the historical heating flow rate data.

[0184] The trend similarity of the first historical sequence is 0.92; the trend similarity of the second historical sequence is 0.76; and the trend similarity of the third historical sequence is 0.85.

[0185] The preset similarity threshold is 0.90. The controller determines that the trend similarity corresponding to the first historical sequence meets the preset similarity threshold, and therefore determines the first historical sequence as the target historical heating flow change sequence.

[0186] Step S305: Obtain the subsequent heating flow trend characteristics after the time range corresponding to the target historical heating flow change sequence.

[0187] Subsequent heating flow trend characteristics refer to the direction and degree of change in heating flow over time after the historical time range corresponding to the target historical heating flow change sequence ends.

[0188] The controller acquires historical heating flow data within a continuously preset time period based on the historical time nodes corresponding to the target historical heating flow change sequence, analyzes the heating flow changes within this time range, obtains the corresponding change direction and change rate, and uses them as the trend characteristics of subsequent heating flow.

[0189] Step S306: Determine whether the trend change direction corresponding to the subsequent heating flow trend characteristics is consistent with the trend change direction corresponding to the current heating flow change sequence.

[0190] The direction of trend change refers to the overall direction of change in heating flow within a corresponding time range, including the direction of continuous increase in heating flow and the direction of continuous decrease in heating flow.

[0191] The controller acquires the current heating flow rate change sequence and the corresponding change direction of the subsequent heating flow rate trend characteristics, and compares the two change directions. When the two change directions are the same, the trend change direction is determined to be consistent; when the two change directions are different, the trend change direction is determined to be inconsistent.

[0192] Step S307: If consistent, determine the heating demand change trend within the future preset time period based on the subsequent heating flow trend characteristics corresponding to the target historical heating flow change sequence.

[0193] In one feasible embodiment, the controller acquires historical heating flow data within a preset time period following the target historical heating flow change sequence, performs linear fitting on the heating flow data within this time range, and obtains the slope of subsequent heating flow change. When the fitting slope is greater than a preset rising threshold, the subsequent heating flow trend is determined to be continuously increasing; when the fitting slope is less than a preset falling threshold, the subsequent heating flow trend is determined to be continuously decreasing; when the fitting slope is within a preset range, the subsequent heating flow trend is determined to be basically stable. The controller determines the heating demand change trend within a preset future time period based on the above trend characteristics.

[0194] Step S308: When the trend change direction corresponding to the subsequent heating flow trend characteristics is continuously increasing, it is determined that the heating demand in the future preset time period shows a continuous upward trend.

[0195] The controller analyzes subsequent heating flow data following the target historical heating flow change sequence, calculating the flow change between adjacent time points. If the flow change at multiple consecutive time points is greater than zero, and the cumulative increase exceeds a preset growth threshold, the trend of subsequent heating flow is determined to be continuously increasing. Based on this determination, the controller determines that heating demand will continue to increase within a preset future time period.

[0196] Step S309: When the trend change direction corresponding to the subsequent heating flow trend characteristics is continuously decreasing, it is determined that the heating demand in the future preset time period shows a continuous downward trend.

[0197] The controller analyzes subsequent heating flow data following the target historical heating flow change sequence, calculating the flow change between adjacent time points. If the flow change at multiple consecutive time points is less than zero, and the cumulative decrease exceeds a preset decrease threshold, the trend of subsequent heating flow is determined to be a continuous decrease. Based on this determination, the controller determines that heating demand will continue to decrease within a preset future time period.

[0198] Step S310: If there is no consistency, the current change in heating demand is determined to be a random fluctuation.

[0199] If the current heating flow rate change sequence corresponds to an increasing trend, while the subsequent trend of the target historical heating flow rate change sequence is decreasing, then the two are determined to have inconsistent trends. Similarly, if the current heating flow rate change sequence corresponds to a decreasing trend, while the subsequent trend of the target historical heating flow rate change sequence is increasing, then the two are also determined to have inconsistent trends.

[0200] When the judgment result is inconsistent, the controller believes that the current change in heating flow has not formed a continuous change pattern corresponding to historical operating conditions, marks the current change in heating demand as random fluctuation, and maintains the current target heating flow update strategy.

[0201] This application provides a method for removing condensate, referring to... Figure 4 The method includes: Step S401: Obtain the current pipe wall temperature of the extraction steam pipeline of the extraction condensing unit.

[0202] Steam extraction pipelines refer to the pipeline structures that connect the steam extraction outlet of the condensing turbine unit to the heating main pipe, and are used to transport the steam extracted by the condensing turbine unit.

[0203] The current pipe wall temperature refers to the temperature value of the metal pipe wall of the extraction steam pipeline at the current moment, which is used to reflect the current thermal state of the extraction steam pipeline.

[0204] Multiple thermocouple temperature sensors are installed on the outer wall of the extraction steam pipeline, and temperature data at each detection location is acquired according to a preset detection interval.

[0205] Specifically, multiple temperature detection points are set along the length of the steam extraction pipeline. Temperature sensors are used to acquire the pipe wall temperature corresponding to each detection point, and the temperature data collected from multiple detection points are sent to the controller.

[0206] The controller averages the temperature data from multiple detection points to obtain the current pipe wall temperature corresponding to the steam extraction pipeline.

[0207] Step S402: Determine whether the current pipe wall temperature is lower than the preset cold idle threshold.

[0208] The cold idle threshold is a pre-set temperature critical value used to distinguish between the normal temperature state and the cold idle state of the extraction steam pipeline. When the current pipe wall temperature is lower than this threshold, it means that the extraction steam pipeline has not been supplied with steam for a long time, and the internal temperature of the pipeline has dropped to a cold state.

[0209] The controller obtains the current pipe wall temperature obtained in step S401 and compares the current pipe wall temperature with the pre-stored cold idle threshold.

[0210] Specifically, calculate the temperature difference between the current pipe wall temperature and the cold idle threshold: ΔT = T c -T.

[0211] Among them, T c This represents the cold idle threshold, and T represents the current pipe wall temperature.

[0212] When ΔT>0, it means that the current pipe wall temperature is lower than the cold idle threshold, and the extraction steam pipeline is determined to be in a cold idle state; when ΔT≤0, it means that the current pipe wall temperature is not lower than the cold idle threshold, and it is not determined to be in a cold idle state.

[0213] Step S403: If yes, then determine that the extraction steam pipeline is in a cold idle state, and control the extraction condensing unit to introduce pulse steam into the extraction steam pipeline with a preset pulse flow rate and preset pulse duration.

[0214] Pulse steam refers to steam intermittently input into the extraction pipeline according to a preset flow rate and preset time interval, used to initially heat up the cold extraction pipeline and detect the internal condition of the pipeline.

[0215] The preset pulse flow rate refers to the steam flow rate value set in advance during a single pulse input process, which is used to control the amount of steam entering the extraction steam pipeline.

[0216] The preset pulse duration refers to the duration of a single pulse of steam input, which is used to control the duration of each steam input.

[0217] After determining that the extraction steam pipeline is in a cold, idle state, the controller opens the steam regulating valve on the extraction steam pipeline and controls the valve opening according to the preset pulse flow rate, allowing the steam output from the extraction condensing unit to enter the extraction steam pipeline at the preset flow rate. Simultaneously, the controller controls the steam input time according to the preset pulse duration, and closes the regulating valve after the single pulse input time is reached, stopping the steam from entering the extraction steam pipeline.

[0218] By intermittently inputting steam, a small amount of high-temperature steam first enters the interior of the cold pipe, exchanges heat with the low-temperature pipe wall, and increases the pipe wall temperature, while avoiding the cold pipe from directly bearing a large flow of steam and causing a drastic temperature difference.

[0219] On the other hand, if the current pipe wall temperature is not lower than the preset cold idle threshold, no action is required.

[0220] Step S404: Obtain the pipeline humidity change parameters after the pulse steam is introduced.

[0221] The pipeline humidity change parameter refers to the data on the change of humidity on the outlet side of the extraction steam pipeline over time after the pulse steam is introduced into the extraction steam pipeline. It is used to reflect whether the pulse steam carries internal residual condensate during the process of flowing through the pipeline.

[0222] The controller is equipped with a humidity detection module at the outlet side of the extraction steam pipeline. After the pulse steam enters the extraction steam pipeline, the humidity detection module continuously collects the humidity value of the steam at the outlet side.

[0223] Specifically, the controller acquires the initial humidity value before the pulse steam is introduced and the real-time humidity value after the introduction, and calculates the humidity difference before and after the introduction, using the humidity difference as a parameter for the change in pipeline humidity.

[0224] Step S405: Compare the humidity change parameters of the pipeline with the waterless baseline response of the extraction steam pipeline under the condition of no water accumulation, and determine whether there is condensate accumulation in the extraction steam pipeline based on the comparison results.

[0225] The waterless reference response refers to the standard response curve formed by the change of outlet humidity over time under the same pulsed steam input conditions when there is no condensate inside the extraction steam pipeline.

[0226] The controller matches the pipeline humidity change parameters acquired after the current pulse steam input with the pre-stored waterless baseline response, comparing the differences between the two in humidity change amplitude, humidity peak occurrence time, and humidity recovery time. The controller determines the water accumulation judgment result based on the response deviation between the two.

[0227] When the deviation between the current humidity change parameter and the waterless baseline response exceeds the preset water accumulation threshold, it indicates that the pulse steam flow carries additional moisture, and it is determined that there is condensate accumulation inside the extraction steam pipe.

[0228] When the deviation between the current humidity change parameter and the waterless baseline response does not exceed the preset water accumulation judgment threshold, it indicates that the current humidity change conforms to the steam flow characteristics under waterless conditions, and it is determined that there is no condensate accumulation inside the extraction steam pipeline.

[0229] Step S406: If there is no condensate accumulation, the extraction condensing unit executes the conventional pipe warm-up process, then extracts compensating steam from the extraction steam position of the corresponding pressure level and delivers it to the heating main pipe.

[0230] Once it is determined that there is no condensate in the extraction steam pipeline, it indicates that the current extraction steam pipeline meets the normal start-up conditions, and the extraction steam channel of the corresponding pressure level is opened according to the preset extraction steam start-up logic.

[0231] The controller matches the extraction steam position of the condensing turbine to the corresponding pressure level inside the unit based on the target heating pressure in the heating demand, and opens the corresponding extraction steam regulating valve to allow steam from inside the condensing turbine to enter the heating header. At the same time, it adjusts the opening of the extraction steam regulating valve according to the heating flow gap to ensure that the extracted compensation steam flow meets the current heating demand.

[0232] Step S407: If condensate accumulates, execute the preset water accumulation treatment process.

[0233] When condensate accumulation is detected in the extraction steam pipeline, the controller invokes a preset condensate removal procedure. This procedure involves drainage, purging, and status monitoring to remove the condensate and restore the extraction steam pipeline to a usable extraction state. For detailed condensate removal procedures, please refer to [link / reference]. Figure 5 The relevant content in the embodiments.

[0234] This application provides a preset water accumulation treatment method, referring to... Figure 5 The method includes: Step S501: Determine the target warm-up extraction steam level from the extraction steam pressure levels corresponding to the extraction condensing unit.

[0235] The target warm-pipe extraction steam level refers to the extraction steam pressure level used to input warm-pipe steam into the extraction steam pipeline. This pressure level is higher than the extraction steam pressure level required for subsequent heating and is used to provide warm-pipe steam with a temperature margin.

[0236] The controller matches the target extraction steam pressure level corresponding to the heating demand to one pressure level higher than the preset stepped extraction steam pressure levels of the extraction condensing unit, and determines the extraction steam position higher than the target extraction steam pressure level as the target warm-up extraction steam level. If steam of the same level as the subsequent working extraction steam is used for warm-up, the actual pipe wall temperature will be difficult to reach the working temperature due to heat dissipation during the warm-up process. Therefore, steam of a higher pressure level is selected for warm-up to increase the warm-up temperature margin and enable the pipeline to quickly reach a stable working state.

[0237] Step S502: Control the extraction condensing unit to introduce pre-set warming steam into the extraction steam pipeline from the extraction position corresponding to the target warming extraction level.

[0238] Warm-up flow rate refers to the amount of warm-up steam input into the extraction steam pipeline per unit time when the extraction steam pipeline is heated and restored, and is used to control the heating rate during the warm-up process.

[0239] According to the target steam extraction level determined in step S501, the controller controls the extraction condensing unit to open the extraction regulating valve at the corresponding extraction position, so that steam at that pressure level enters the extraction pipeline.

[0240] Meanwhile, the controller adjusts the opening of the extraction steam regulating valve according to the preset warming flow rate, so that the warming steam flow rate entering the extraction steam pipeline is maintained within the preset range. The inner wall of the extraction steam pipeline is continuously heated by the low flow rate of steam, avoiding the pipeline temperature from changing too quickly due to the excessive steam flow rate in the initial stage.

[0241] Step S503: After the warming steam enters the extraction steam pipe, close the discharge channel on the outlet side of the extraction steam pipe to keep the warming steam in the extraction steam pipe for a preset blocking time.

[0242] The pipe-closing time refers to the time during the pipe-warming process when the exhaust channel on the outlet side of the extraction pipe is closed, allowing the warming steam to remain temporarily inside the extraction pipe and continue to exchange heat with the pipe wall. This time is used to increase the overall temperature of the extraction pipe.

[0243] After the controller detects that the warm-up steam enters the extraction steam pipeline according to the preset warm-up steam flow rate, it controls the discharge valve in the discharge channel on the outlet side of the extraction steam pipeline to close, so that the outlet of the extraction steam pipeline is in a closed state.

[0244] After the discharge valve is closed, the warm steam that has entered the extraction steam pipe cannot be discharged directly. The steam stays inside the pipe and continues to transfer heat to the pipe wall through heat conduction.

[0245] At the same time, the controller starts the tube blocking timer. When the preset tube blocking time is reached, the tube blocking stage ends, so that the internal temperature of the extraction steam pipeline reaches the requirements for subsequent extraction steam operation.

[0246] Step S504: After the preset pipe shut-off time is reached, open the discharge channel on the outlet side of the extraction steam pipe to increase the flow rate of warming steam and purge the extraction steam pipe with warming steam.

[0247] After the preheating period reaches the preset value, the controller opens the discharge valve on the outlet side of the extraction steam pipeline, restoring steam flow inside the extraction steam pipeline. Then, the controller increases the steam output flow rate at the extraction location corresponding to the target preheating extraction level, ensuring a continuous flow of high-temperature preheating steam into the extraction steam pipeline.

[0248] Because the overall temperature of the extraction steam pipeline has increased during the pipe-closing stage, the residual condensate inside the pipeline absorbs heat upon contact with the warm-pipe steam and vaporizes to form secondary steam. At the same time, the continuously flowing warm-pipe steam carries the vaporized water vapor and trace amounts of incompletely vaporized water droplets toward the outlet side and discharges them through the exhaust channel, thereby reducing the water content inside the extraction steam pipeline.

[0249] Step S505: Update the pipeline humidity change parameters during the purging process until the steam extraction recovery conditions are met.

[0250] Steam extraction recovery conditions refer to the criteria for determining whether the steam extraction pipeline meets the requirements for normal steam extraction operation after warm-up and purging. These conditions are used to determine whether the condensing turbine unit can resume outputting compensating steam from the corresponding steam extraction location.

[0251] The controller acquires the humidity detection value of the outlet emission steam according to the preset sampling cycle, and compares the current humidity detection value with the humidity detection value of the previous detection cycle to obtain the humidity change trend.

[0252] When the outlet humidity is detected to be continuously decreasing and tending to stabilize, it indicates that the residual condensate in the extraction steam pipeline has been basically discharged, and the extraction steam pipeline has reached the extraction recovery condition. If the humidity still increases significantly or fluctuates, the purging state should be maintained and the pipeline humidity change parameters should be continuously updated.

[0253] This application provides a purging method, referring to... Figure 6 The method includes: Step S601: Control the flow guiding mechanism at the inlet of the extraction steam pipe to adjust the direction of the warm-up steam entering the pipe, so that the warm-up steam deflects relative to the axis of the extraction steam pipe.

[0254] A flow guiding mechanism is an adjustment structure installed at the inlet of a steam extraction pipe to change the direction of steam flow into the pipe. Examples include rotatable guide vanes and swirl guide plates, which are used to make the warm-up steam entering the pipe flow in a preset direction.

[0255] The deflection angle is the angle between the actual flow direction of the warm-up steam and the axial direction of the extraction steam pipe, and is used to characterize the flow state of the warm-up steam after it enters the pipe.

[0256] Based on the structural parameters of the extraction steam pipeline and the current warm-up requirements, the controller controls the flow guiding mechanism at the inlet to adjust the deflection angle. When the steam flows through the flow guiding mechanism, under the guidance of the flow guiding surface, the flow direction changes from the straight direction along the pipeline axis to an oblique direction at a certain angle with the axis, thereby generating a deflection relative to the axis of the extraction steam pipeline.

[0257] Because the direction of the warm-up steam inlet is deflected, the steam forms a swirling flow inside the extraction pipe, increasing the contact area between the high-temperature steam and the pipe wall, thus improving the heat exchange efficiency between the warm-up steam and the pipe wall. At the same time, the deflected steam flow enhances the disturbance effect on the pipe wall and residual condensate in low-lying areas, making it easier for condensate generated during subsequent warm-up processes to be carried to the discharge location.

[0258] Step S602: According to the deflected entry direction, warm-pipe steam is introduced into the extraction steam pipe, so that the warm-pipe steam forms a spiral flow that rotates and moves along the pipe wall inside the extraction steam pipe.

[0259] Because the direction of the warm-up steam entering the pipe is deflected relative to the axis of the extraction pipe, the steam entering the pipe has both a velocity component moving along the axial direction of the pipe and a circumferential velocity component rotating around the center of the pipe, causing the warm-up steam to form a spiral flow state that rotates and propels along the pipe wall inside the extraction pipe.

[0260] This spiral flow increases the flow path of warming steam inside the extraction pipe, allowing high-temperature steam to continuously sweep across the pipe wall area, improving the uniformity of pipe wall heating, and enhancing the disturbance effect of steam on the condensate adhering to the pipe wall.

[0261] This application provides a purging and adjustment method, referring to... Figure 7 The method includes: Step S701: Control the extraction condensing unit to input warm-up steam into the extraction steam pipeline according to the preset pulse cycle.

[0262] The preset pulse cycle refers to the time period for intermittently inputting warming steam into the extraction steam pipeline.

[0263] The controller periodically opens and closes the extraction steam regulating valve based on a preset pulse cycle. Within each pulse cycle, the controller first opens the extraction steam regulating valve and maintains the preset pulse input duration to allow warm-up steam to enter the extraction steam pipeline. Then, it closes the extraction steam regulating valve and maintains the preset pulse interval duration to stop the steam from entering. The controller waits for the effect of the current pulse to stabilize before starting the next pulse cycle.

[0264] Step S702: Obtain the pipeline pressure change parameters and pipeline humidity change parameters corresponding to each pulse input process.

[0265] The pipeline pressure change parameter is a set of values ​​showing the change in internal pressure of the extraction pipeline over time during each pulse input process, used to reflect the flow resistance state of steam in the pipeline.

[0266] During each pulse input, the controller collects pressure and humidity data at a fixed sampling frequency using a pressure sensor installed at the inlet side and a humidity detection module installed at the outlet side of the extraction steam pipeline. The controller arranges all pressure values ​​collected within a single pulse input duration in chronological order to form pipeline pressure variation parameters, and simultaneously arranges all humidity values ​​in chronological order to form humidity variation parameters.

[0267] Step S703: Determine the swirl enhancement requirements corresponding to the current purging stage based on the pipeline pressure change parameters and pipeline humidity change parameters.

[0268] The controller analyzes the pressure rise rate and humidity fall rate during a single pulse input. When the pressure rise rate exceeds the preset pressure rise threshold and the humidity fall rate is lower than the preset dehumidification threshold, it indicates that water accumulation in the pipeline is creating significant resistance to steam flow, but the water is being discharged slowly. The controller determines that the current purging phase requires enhanced spiral flow stripping capability, classifying the swirl enhancement requirement as high-level. When the pressure rises gradually and the humidity falls rapidly, it indicates good purging effect, classifying the swirl enhancement requirement as low-level.

[0269] Step S704: Gradually increase the steam input flow rate in subsequent pulse cycles according to the swirl enhancement requirements.

[0270] Based on the currently determined swirl enhancement requirement level, the controller retrieves the steam input flow rate value to be used in the next pulse cycle from the preset flow rate ladder table. When the swirl enhancement requirement is high, the controller increases the steam input flow rate of the next pulse cycle by the preset increment value based on the previous cycle. When the swirl enhancement requirement is low, the controller maintains or slightly increases the steam input flow rate. The controller writes the updated flow rate value into the flow rate setpoint for the next pulse cycle.

[0271] Step S705: While increasing the steam input flow rate, increase the tangential velocity of the warm-up steam when it enters the extraction steam pipe, so that the spiral flow velocity in the extraction steam pipe increases gradually.

[0272] While increasing the steam input flow rate for the next pulse cycle, an angle adjustment command is sent to the guide mechanism at the inlet of the extraction steam pipe to increase the deflection angle of the guide mechanism. With the increased deflection angle, the circumferential velocity component of the steam entering the pipe increases, and the tangential velocity increases accordingly. Under the combined effect of increased axial flow rate and circumferential velocity, the helical flow velocity within the extraction steam pipe gradually increases, and the shearing and stripping effect on the liquid accumulated on the pipe wall gradually intensifies.

[0273] Step S706: When the pipeline humidity change parameter is lower than the preset humidity threshold, maintain the current pulse input parameter to complete the extraction steam pipeline purging.

[0274] The preset humidity threshold refers to the humidity threshold value that is set in advance to determine that the condensate in the steam extraction pipeline has been basically drained.

[0275] During each pulse interval, the latest collected pipeline humidity change parameter is compared with a preset humidity threshold. When the outlet humidity value is detected to be consistently lower than the preset humidity threshold, and the pipeline humidity change parameter remains stable at a low value for several consecutive pulse cycles, the controller determines that the condensate in the extraction steam pipeline has been completely removed. At this point, the controller stops increasing the steam input flow rate and tangential velocity, maintains the flow rate value, deflection angle, and pulse cycle duration of the current pulse cycle, and continues to run for several pulse cycles until the extraction steam pipeline purging is completed.

[0276] Based on the same inventive concept, embodiments of this application provide a steam flow distribution system for a waste-to-energy plant, comprising: The acquisition module is used to acquire steam supply parameters, first steam inlet parameters, second steam inlet parameters, first output parameters, and heating demand. A memory for storing the program for the steam flow distribution method of the waste-to-energy plant described above; The processor can load and execute programs in memory to implement the aforementioned steam flow distribution method for waste-to-energy plants.

[0277] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0278] This application provides a computer-readable storage medium storing a computer program that can be loaded by a processor and executed as a method for distributing steam flow in a waste-to-energy plant.

[0279] Computer storage media include, for example, USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, optical disks, and other media that can store program code.

[0280] Based on the same inventive concept, embodiments of this application provide a smart terminal, including a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as a method for distributing steam flow in a waste-to-energy plant.

[0281] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0282] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A method for distributing steam flow in a waste-to-energy plant, characterized in that, include: Obtain the steam supply parameters of the steam source input; Obtain the first steam inlet parameters corresponding to the back pressure unit and the second steam inlet parameters corresponding to the extraction condensing unit; Based on the steam supply parameters, the first steam inlet parameters, and the second steam inlet parameters, determine the basic distribution ratio of the steam source input between the back pressure unit and the extraction condensing unit; Steam is supplied to the back pressure unit and the extraction condensing unit according to the basic allocation ratio; The first output parameters of the steam after passing through the back pressure unit are obtained, wherein the first output parameters include the first output pressure and the first output flow rate; Obtain the heating demand of the main heating pipe and determine the target heating flow rate based on the heating demand; Determine whether the target heating flow rate is greater than the first output flow rate; If it is greater than the target heating flow rate, then obtain the heating difference between the target heating flow rate and the first output flow rate; When the heating difference is not greater than the increaseable heating flow of the back pressure unit, the basic allocation ratio is adjusted according to the increaseable heating flow to increase the steam flow of the back pressure unit and simultaneously reduce the steam flow of the extraction condensing unit. When the heating difference is greater than the increaseable heating flow of the back pressure unit, the heating flow gap is determined based on the difference between the heating difference and the increaseable heating flow. Based on the heating flow gap, the extraction condensing unit is controlled to extract compensating steam from the extraction steam position corresponding to the heating pressure in the heating demand and deliver it to the heating main pipe. If the target heat supply flow rate is not greater than the target flow rate, the basic allocation ratio will be adjusted according to the target heat supply flow rate to reduce the steam inlet flow rate of the back pressure unit and increase the steam inlet flow rate of the extraction condensing unit.

2. The steam flow distribution method for a waste-to-energy plant according to claim 1, characterized in that, The method further includes: Obtain historical heating flow data within a preset time period; Based on historical heating flow data, identify the trend and random fluctuation characteristics of heating flow. Based on the characteristics of trend changes, determine whether the heating demand in the future preset period will show a continuous upward or downward trend; When a continuous upward or downward trend is determined, the trend advance correction amount is calculated based on the characteristics of the trend change. The heating flow rate is updated in advance based on the trend advance correction amount to obtain the advance target heating flow rate, and the advance target heating flow rate is used as the target heating flow rate. When it is determined that there is no continuous upward or downward trend, the fluctuation confidence interval is calculated based on the random fluctuation characteristics. Determine whether the current change in the target heating flow rate is within the fluctuation confidence interval; When the fluctuation confidence interval is within the range, the current change is determined to be an instantaneous random disturbance, and the target heating flow rate is updated with a delay, maintaining the heating flow rate of the previous moment as the target heating flow rate. When the target heating flow rate is not within the fluctuation confidence interval, it is updated based on the current change, and the updated heating flow rate is used as the target heating flow rate.

3. The steam flow distribution method for a waste-to-energy plant according to claim 2, characterized in that, The method further includes: Obtain the heating flow rate data within the preset calibration time period before the current moment to obtain the current heating flow rate change sequence; Based on the time range corresponding to the current heating flow change sequence, match multiple historical heating flow change sequences corresponding to the same time range in the historical heating flow data; Calculate the trend similarity between the current heating flow rate change sequence and each historical heating flow rate change sequence; Based on the trend similarity of multiple historical heating flow change sequences, a target historical heating flow change sequence that matches the current heating flow change sequence is determined. Obtain the subsequent heating flow trend characteristics after the corresponding time range of the target historical heating flow change sequence; Determine whether the trend change direction corresponding to the subsequent heating flow trend characteristics is consistent with the trend change direction corresponding to the current heating flow change sequence; If they are consistent, the heating demand trend in the future preset period is determined based on the subsequent heating flow trend characteristics corresponding to the target historical heating flow change sequence. When the trend of subsequent heating flow is continuously increasing, it is determined that the heating demand in the future preset period will show a continuous upward trend. When the trend of subsequent heating flow rate is continuously decreasing, it is determined that the heating demand in the future preset period will show a continuous downward trend. If they are inconsistent, the current change in heating demand is determined to be a random fluctuation.

4. The steam flow distribution method for a waste-to-energy plant according to claim 1, characterized in that, The method further includes: Obtain the current pipe wall temperature of the extraction steam pipeline of the extraction condensing unit; Determine whether the current pipe wall temperature is lower than the preset cold idle threshold; If so, the extraction steam pipeline is determined to be in a cold idle state, and the extraction condensing unit is controlled to introduce pulse steam into the extraction steam pipeline with a preset pulse flow rate and preset pulse duration. Obtain parameters showing changes in pipeline humidity after pulsed steam is introduced; The humidity change parameters of the pipeline are compared with the waterless baseline response of the extraction steam pipeline under the condition of no water accumulation. Based on the comparison results, it is determined whether there is condensate accumulation in the extraction steam pipeline. If there is no condensate accumulation, the extraction condensing unit will execute the conventional pipe warm-up process, and then extract compensating steam from the extraction steam position of the corresponding pressure level and deliver it to the heating main pipe. If condensation accumulates, the preset water treatment process will be executed.

5. The steam flow distribution method for a waste-to-energy plant according to claim 4, characterized in that, The execution of the preset water accumulation treatment process includes: Determine the target warm-up extraction steam level from the extraction steam pressure levels corresponding to the extraction condensing unit; The extraction condensing unit controls the steam to be introduced into the extraction pipeline at a preset steam flow rate from the extraction position corresponding to the target steam extraction level. After the warming steam enters the extraction steam pipe, the discharge channel on the outlet side of the extraction steam pipe is closed, so that the warming steam remains in the extraction steam pipe for a preset shut-off time. After the preset pipe shut-off time is reached, the discharge channel on the outlet side of the extraction steam pipe is opened to increase the flow rate of warming steam and allow the warming steam to purge the extraction steam pipe. During the purging process, update the pipeline humidity change parameters until the conditions for steam extraction recovery are met.

6. The steam flow distribution method for a waste-to-energy plant according to claim 5, characterized in that, The method further includes: The flow guiding mechanism at the inlet of the extraction steam pipe is controlled to adjust the direction of the warm-up steam entering the pipe, so that the warm-up steam deflects relative to the axis of the extraction steam pipe. Warming steam is introduced into the extraction pipe according to the deflected entry direction, so that the warming steam forms a spiral flow that rotates and moves along the pipe wall inside the extraction pipe.

7. The steam flow distribution method for a waste-to-energy plant according to claim 6, characterized in that, The method further includes: The extraction condensing unit is controlled to input warm-up steam into the extraction steam pipeline according to a preset pulse cycle; Acquire the pipeline pressure change parameters and pipeline humidity change parameters corresponding to each pulse input process; Determine the swirl enhancement requirements for the current purging stage based on pipeline pressure and humidity variation parameters. Gradually increase the steam input flow rate in subsequent pulse cycles according to the swirl enhancement requirements; While increasing the steam input flow rate, the tangential velocity of the warm-up steam entering the extraction steam pipe is increased, so that the spiral flow velocity in the extraction steam pipe increases gradually. When the humidity change parameter in the pipeline is lower than the preset humidity threshold, the current pulse input parameter is maintained to complete the steam extraction pipeline purging.

8. A steam flow distribution system for a waste-to-energy plant, characterized in that, The system is used to execute the steam flow distribution method for waste-to-energy plants as described in any one of claims 1 to 7, including: The acquisition module is used to acquire steam supply parameters, first steam inlet parameters, second steam inlet parameters, first output parameters, and heating demand. A memory for storing the program for the steam flow distribution method of the waste-to-energy plant; The processor and the program in the memory can be loaded and executed by the processor to implement the steam flow distribution method of the waste-to-energy plant.

9. A smart terminal, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program that can be loaded by the processor and executed as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer program is stored that can be loaded by a processor and execute the method as described in any one of claims 1 to 7.

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