Drainage multi-path switching and water quality standard-reaching control process for heater of heat supply network

Abstract

The invention discloses a heating network heater drainage multi-path switching and water quality standard reaching control technology, and relates to the field of path switching and water quality control, and the technology comprises the steps: configuring a foundation of a heating network heater drainage system, including a conventional drainage path and an accident drainage path, the conventional drainage path is composed of a drainage pump, a drainage pipeline, a drainage control valve and a pipeline connected with a condensate water mother pipe, and the accident drainage path is composed of a drainage pipeline, an accident drainage control valve and a discharge connector connected with a waste heat boiler fixed discharge pipeline. A tubular heat supply network heater is arranged in a heat supply network circulating water system, and a multi-path drainage drainage system comprising a conventional drainage path and an accident drainage path is established on the outlet side of the heat supply network heater, so that graded recovery and abnormal isolation of drainage are realized; and continuously monitoring the hydrophobicity by combining an on-line conductivity analyzer, an on-line pH analyzer and an on-line iron ion analyzer.

Description

Technical Field

[0001] This invention relates to the field of path switching and water quality control, and in particular to a process for multi-path switching of condensate drains from a heating network heater and water quality compliance control. Background Technology

[0002] Heat network heaters are key equipment in centralized heating systems used to increase the temperature of circulating water, ensure heat exchange efficiency, and maintain system stability. During operation, heat network heaters generate a certain amount of condensate. If the condensate quality meets the circulating water standards, it can be recovered through the conventional condensate path and sent to the condensate header for heat energy reuse. If the condensate quality does not meet the requirements, it must be discharged through the emergency condensate path to avoid polluting the circulating water. With the increasing demands for energy utilization and water quality stability in heating systems, how to accurately switch between condensate recovery and discharge, and how to ensure the stability of the water level in the heat network tank and the quality of the circulating water when the water quality is substandard for an extended period, has become an important technical direction for the operation and management of heat networks.

[0003] Existing heat network heater condensate treatment technologies typically rely on a single path for discharge or recycling, lacking a real-time monitoring and assessment mechanism for condensate quality, conductivity, pH value, and iron ion concentration. This makes it impossible to dynamically adjust according to water quality changes, resulting in a low condensate quality compliance rate and low thermal energy utilization. Furthermore, when condensate quality remains substandard for an extended period, existing systems lack a coordinated strategy with the chemical makeup water treatment system, making it impossible to balance condensate recovery and makeup water addition while maintaining water quality compliance. This can easily lead to fluctuations in the heat network water tank level and a decline in circulating water quality. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a multi-path switching and water quality compliance control process for the condensate drain of a heating network heater. This process involves configuring conventional and emergency condensate drain paths, combined with online conductivity, pH, and iron ion analyzers to monitor condensate water quality in real time, and using a condensate water quality determination function for path switching control. When the condensate water quality remains substandard for an extended period, the decentralized control system automatically activates the chemical makeup water treatment system. This system provides demineralized water to the heating network system via a two-stage reverse osmosis unit and a mixed ion exchanger, balancing the condensate recovery rate and makeup water dosage in real time to maintain a stable water level in the heating network tank. This ensures that the conductivity of the circulating water does not exceed 2.0 μS / cm and the dissolved oxygen does not exceed 20 μg / L. This process not only improves the condensate recovery rate and thermal energy utilization rate but also guarantees the stability of the circulating water quality and the safe operation of the heating system.

[0005] Therefore, this application provides a process for multi-path switching of condensate drains in heating network heaters and water quality compliance control, including the following steps:

[0006] Step S100: Configure the basics of the heating network heater drainage system, including: conventional drainage path and emergency drainage path.

[0007] The conventional drainage path consists of a drainage pump, drainage pipeline, drainage control valve, and a pipe connected to the condensate header. The emergency drainage path consists of a drainage pipeline, an emergency drainage control valve, and a discharge interface connected to the waste heat boiler's scheduled discharge pipeline.

[0008] Step S200: Collect hydrophobic water quality monitoring data and compare it with the threshold, configure the hydrophobic path switching judgment function, execute the hydrophobic path switching logic, configure the automatic switching and manual intervention mechanism, and set the switching action confirmation and safety delay.

[0009] Step S300: Configure the online monitoring module for condensate water quality, establish a data input channel, set up a water quality compliance control module, bind the judgment logic, set the threshold for condensate water quality compliance, establish an early warning mechanism, and configure dynamic adjustment and path control strategies.

[0010] Step S400: Identify abnormal operating conditions based on water quality compliance control results; develop an accident drainage path maintenance strategy based on the abnormal operating condition identification results; set an accident emergency procedure triggering and segmented adjustment strategy based on the abnormal operating condition identification results; and determine abnormal trends based on the abnormal operating condition identification results.

[0011] Step S500: Configure the makeup water dosing start-up conditions, configure the chemical makeup water treatment system and makeup water dosing regulation, and configure the dual-constraint circulating water quality maintenance.

[0012] Step S600: Configure the hydrophobic operation data record and time series database, configure the hydrophobic operation index statistics and evaluation model, set the operation optimization and threshold correction strategy, and perform personnel operation and strategy verification.

[0013] As a preferred embodiment of the present invention, step S100 specifically includes:

[0014] Step S100.1: Configure the basics of the heat network heater drainage system, including: conventional drainage path and emergency drainage path.

[0015] In the circulating water system of the heating network, a tubular heating network heater is installed, and a multi-path drainage system is constructed on the outlet side of the tubular heating network heater. The multi-path drainage system includes: a regular drainage path and an emergency drainage path.

[0016] The conventional condensate drain path delivers condensate generated during the operation of the heating network heater to the condensate header via a condensate pump under normal operating conditions. The emergency condensate drain path discharges condensate into the waste heat boiler's scheduled discharge pipeline during the start-up phase of the heating network heater or when the condensate quality generated by the heating network heater does not meet the set standards.

[0017] Independent drainage control valves and flow detection devices are installed in both the conventional drainage path and the emergency drainage path. The drainage control valves are used to switch the opening and closing of the drainage path according to the control command during operation. The flow detection devices are used to monitor the drainage flow in real time. The switching between the conventional drainage path and the emergency drainage path is controlled by a distributed control system.

[0018] As a preferred embodiment of the present invention, step S200 specifically includes:

[0019] Step S200.1: Collect hydrophobic water quality monitoring data, compare it with the threshold, configure the hydrophobic path switching judgment function, and execute the hydrophobic path switching logic.

[0020] In the initial stage of operation of the heating network heater, the distributed control system receives real-time monitoring data from online conductivity analyzers, online pH analyzers, and online iron ion analyzers installed on the conventional drainage path and the emergency drainage path. The water quality judgment standard consists of conductivity judgment threshold, pH judgment threshold, and iron ion judgment threshold as follows: the conductivity judgment threshold is set to less than or equal to 2.0 microsiemens / cm, the pH judgment threshold is set to 9.0 to 10.0, and the iron ion judgment threshold is set to less than or equal to 0.10 mg / L.

[0021] When the real-time monitoring values ​​of conductivity, pH, and iron ions received by the distributed control system simultaneously meet the above three judgment thresholds, the hydrophobic water quality is judged as qualified hydrophobic. If any parameter exceeds the threshold range, it is judged as unqualified hydrophobic.

[0022] The distributed control system uses a decision function to make logical judgments on real-time sampled data. The hydrophobic water quality decision function serves as the trigger condition input for the control logic and directly determines the switching state of the hydrophobic path.

[0023] When the output of the condensate quality judgment function is 0, the distributed control system issues a control command to close the condensate control valve on the normal condensate path and open the condensate control valve on the emergency condensate path, discharging the unqualified condensate into the waste heat boiler's scheduled discharge pipeline. When the output of the condensate quality judgment function is 1, the distributed control system issues a control command again to open the condensate control valve on the normal condensate path and close the condensate control valve on the emergency condensate path, allowing the condensate to re-enter the condensate header, thus achieving condensate recycling.

[0024] Step S200.2: Configure automatic switching and manual intervention mechanisms, and set switching action confirmation and safety delay.

[0025] The entire process of switching the drainage path is automatically executed by the distributed control system, which also has a manual intervention function. Operators can directly issue valve opening or closing commands by selecting the manual switching button for the normal drainage path or the emergency drainage path in the operation interface of the distributed control system, so as to realize manual switching. In an emergency, operators can immediately switch the drainage path through the manual intervention function.

[0026] After issuing the drain path switching command, the distributed control system collects the on / off status signals of the drain control valve and the monitoring data of the flow detection device in real time to confirm whether the valve action and flow change are consistent. When executing the drain path switching logic, the distributed control system sets a 30-second delay confirmation mechanism. If the drain is determined to be unqualified, it must be determined to be unqualified three times in a row within 30 seconds before switching to the emergency drain path. If the drain is determined to be qualified, it must be determined to be qualified three times in a row within 30 seconds before switching to the normal drain path.

[0027] As a preferred embodiment of the present invention, step S300 specifically includes:

[0028] Step S300.1: Configure the online monitoring module for condensate water quality, establish a data input channel, set up a water quality compliance control module, and bind the judgment logic.

[0029] Step S300.2: Set the threshold for water quality compliance for condensate drainage, establish an early warning mechanism, and configure dynamic adjustment and path control strategies.

[0030] As a preferred embodiment of the present invention, step S400 specifically includes:

[0031] Step S400.1: Identify abnormal operating conditions based on the water quality compliance control results, and formulate an emergency drainage path maintenance strategy based on the abnormal operating condition identification results.

[0032] When the distributed control system receives data transmitted by the online water quality monitoring module and calls the water quality compliance control module to determine that the condensate water quality is continuously unqualified and the unqualified period lasts for more than 5 minutes, the distributed control system determines that it has entered an abnormal water quality condition. When the water quality is in the warning range and the warning state lasts for more than 10 minutes, the distributed control system also determines that it has entered an abnormal water quality condition.

[0033] In the event of abnormal water quality, the distributed control system immediately keeps the emergency drainage path control valve fully open while closing the regular drainage path control valve, so that all drainage is discharged through the emergency drainage path. At the same time, the distributed control system issues a command to start the backup drainage cooler, which cools the drainage entering the emergency drainage path to a safe discharge temperature of 70°C to 90°C before discharging it into the waste heat boiler's fixed discharge pipeline.

[0034] Step S400.2: Trigger the emergency response procedure and set the segmented adjustment strategy based on the abnormal operating condition identification results, and judge the abnormal trend based on the abnormal operating condition identification results.

[0035] The distributed control system accumulates the duration of abnormal water quality conditions in real time. When the abnormal duration exceeds 30 minutes, the distributed control system automatically triggers the emergency response procedure. The emergency response procedure includes: uploading the emergency condition status signal to the operation record system, saving the real-time monitoring values ​​of conductivity, pH, and iron ions, as well as the hydrophobic flow data collected by the flow detection device, and writing the saved data into the historical database at a resolution of 1 second for subsequent abnormal condition analysis and optimization of control strategies.

[0036] After the emergency response procedure is triggered, the distributed control system enters a segmented adjustment mode. When the real-time conductivity monitoring value recovers to less than or equal to 2.5 μSiemens / cm, the real-time pH monitoring value is between 8.8 and 10.2, and the real-time iron ion monitoring value recovers to less than or equal to 0.15 mg / L, the distributed control system gradually adjusts the opening of the emergency drainage path control valve from 100% to 50%, and simultaneously gradually adjusts the opening of the regular drainage path control valve from 0% to 50%, forming a dual-path diversion operation. In the diversion operation mode, the distributed control system is set with a 30-second confirmation mechanism. When the water quality judgment signal is qualified for drainage for three consecutive monitoring cycles, the opening of the regular drainage path control valve is adjusted to 100%, and the emergency drainage path control valve is closed. If any judgment parameter exceeds the set threshold again in the diversion operation mode, the distributed control system immediately reverts to the fully open state of the emergency drainage path.

[0037] During the abnormal operating condition analysis, the distributed control system calls the abnormal trend judgment formula to judge the trend of the real-time conductivity monitoring value.

[0038] When the rate of change of conductivity is less than -0.05 microsiemens / cm·min, it indicates that the conductivity is gradually decreasing and the water quality is in a recovery trend. When the rate of change of conductivity is greater than 0.05 microsiemens / cm·min, it indicates that the conductivity is gradually increasing and the water quality is in a deterioration trend.

[0039] Based on the trend of the change rate of conductivity, the distributed control system decides whether to extend the opening time of the emergency drainage path or to start the diversion operation mode in advance.

[0040] As a preferred embodiment of the present invention, step S500 specifically includes:

[0041] Step S500.1: Configure the conditions for adding makeup water and configure the chemical makeup water treatment system.

[0042] Step S500.2: Configure the replenishment water addition and adjustment, and configure the dual-constraint circulating water quality maintenance.

[0043] The distributed control system collects water level monitoring data from the water tank level gauge of the heating network in real time, and calls on the monitoring data from the condensate flow detection device and the makeup water flow meter to establish a balance formula between the condensate recovery amount and the makeup water addition amount.

[0044] The distributed control system calculates the water level changes in the heating network tank in real time according to the formula and sets the water level control threshold: when the water level in the heating network tank is below 1.2 meters, the amount of makeup water added is increased; when the water level in the heating network tank is above 2.0 meters, the amount of makeup water added is reduced; when the water level in the heating network tank is between 1.5 meters and 1.8 meters, a dynamic balance between makeup water addition and drainage recovery is maintained.

[0045] During the makeup water dosing process, the distributed control system uses real-time data from the online conductivity analyzer and the online dissolved oxygen analyzer to determine water quality constraints: when the real-time conductivity monitoring value is less than or equal to 2.0 μS / cm, it is determined to be qualified circulating water; when the real-time dissolved oxygen monitoring value is less than or equal to 20 μg / L, it is determined to be qualified circulating water. If the conductivity or dissolved oxygen exceeds the above thresholds, the distributed control system automatically reduces the makeup water dosing rate and triggers an audible and visual alarm, prompting operators to check the operating status of the secondary reverse osmosis unit and the mixed ion exchanger.

[0046] As a preferred embodiment of the present invention, step S600 specifically includes:

[0047] Step S600.1: Configure the hydrophobic operation data record and time series database, and configure the hydrophobic operation index statistics and evaluation model.

[0048] Step S600.2: Set up operation optimization and threshold correction strategies, and verify personnel operations and strategies.

[0049] Based on the statistical results of hydrophobic recovery rate, water quality compliance rate, and heat recovery rate, the data analysis module optimizes the hydrophobic path switching threshold, makeup water dosing parameters, and water quality warning boundaries: When the hydrophobic recovery rate is below 80% and the water quality compliance rate is above 95%, it is recommended to appropriately relax the conductivity cut-off threshold, adjusting it from 1.90 μSiemens / cm to 2.10 μSiemens / cm. When the heat recovery rate is below 85% and the emergency hydrophobic path opening time exceeds 30 minutes / day, it is recommended to narrow the upper limit of the warning interval, adjusting the conductivity warning range from 1.8–2.0 μSiemens / cm to 1.7–1.9 μSiemens / cm. When the conductivity or iron ion concentration fluctuates frequently during operation, triggering multiple threshold switching, the distributed control system calls the smoothing correction algorithm to perform weighted optimization of the switching judgment function parameters.

[0050] After receiving optimization suggestions from the data analysis module, operators can manually confirm and correct parameters in the strategy management interface of the distributed control system. The distributed control system provides simulation verification functions, allowing operators to verify the impact of new thresholds on hydrophobic recovery rate and water quality stability under virtual operating conditions.

[0051] In summary, the multi-path switching and water quality compliance control process for condensate drains from a heating network heater provided in this application achieves graded recovery and abnormal isolation of condensate drains by configuring a tubular heating network heater in the heating network circulating water system and establishing a multi-path condensate drain system including conventional and emergency condensate drain paths at the heater outlet. This process combines online conductivity analyzer, online pH analyzer, and online iron ion analyzer for continuous monitoring of condensate drains and utilizes a distributed control system for automatic switching of condensate drain paths and threshold delay confirmation, effectively preventing unqualified condensate drains from entering the condensate header and contaminating the circulating water. Simultaneously, the water quality compliance control module improves water quality stability through an early warning mechanism and diversion operation strategy. When condensate drains are consistently unqualified, the chemical makeup water treatment system promptly activates to replenish demineralized water, maintaining the dual stability of the heating network water tank level and water quality indicators, ensuring that the heating network system can still achieve efficient and reliable heat recovery and water quality control under complex operating conditions. Attached Figure Description

[0052] Figure 1 This is an overall flow chart of a multi-path switching and water quality compliance control process for a heat network heater condensate provided in an embodiment of this application. Detailed Implementation

[0053] Please refer to Figure 1 It illustrates a flow chart of an embodiment of a multi-path switching and water quality compliance control process for a heating network heater condensate according to the present disclosure.

[0054] like Figure 1As shown, a multi-path switching process for condensate drainage in a heating network heater and a water quality compliance control process include the following steps:

[0055] Step S100: Configure the basics of the heating network heater drainage system, including: conventional drainage path and emergency drainage path.

[0056] The conventional drainage path consists of a drainage pump, drainage pipeline, drainage control valve, and a pipe connected to the condensate header. The emergency drainage path consists of a drainage pipeline, an emergency drainage control valve, and a discharge interface connected to the waste heat boiler's scheduled discharge pipeline.

[0057] Step S200: Collect hydrophobic water quality monitoring data and compare it with the threshold, configure the hydrophobic path switching judgment function, execute the hydrophobic path switching logic, configure the automatic switching and manual intervention mechanism, and set the switching action confirmation and safety delay.

[0058] Step S300: Configure the online monitoring module for condensate water quality, establish a data input channel, set up a water quality compliance control module, bind the judgment logic, set the threshold for condensate water quality compliance, establish an early warning mechanism, and configure dynamic adjustment and path control strategies.

[0059] Step S400: Identify abnormal operating conditions based on water quality compliance control results; develop an accident drainage path maintenance strategy based on the abnormal operating condition identification results; set an accident emergency procedure triggering and segmented adjustment strategy based on the abnormal operating condition identification results; and determine abnormal trends based on the abnormal operating condition identification results.

[0060] Step S500: Configure the makeup water dosing start-up conditions, configure the chemical makeup water treatment system and makeup water dosing regulation, and configure the dual-constraint circulating water quality maintenance.

[0061] Step S600: Configure the hydrophobic operation data record and time series database, configure the hydrophobic operation index statistics and evaluation model, set the operation optimization and threshold correction strategy, and perform personnel operation and strategy verification.

[0062] In some specific embodiments, step S100 specifically includes:

[0063] Step S100.1: Configure the basics of the heat network heater drainage system, including: conventional drainage path and emergency drainage path.

[0064] In the circulating water system of the heating network, a tubular heating network heater is installed, and a multi-path drainage system is constructed on the outlet side of the tubular heating network heater. The multi-path drainage system includes: a regular drainage path and an emergency drainage path.

[0065] The conventional condensate drain path delivers condensate generated during the operation of the heating network heater to the condensate header via a condensate pump under normal operating conditions. The emergency condensate drain path discharges condensate into the waste heat boiler's scheduled discharge pipeline during the start-up phase of the heating network heater or when the condensate quality generated by the heating network heater does not meet the set standards.

[0066] Independent drainage control valves and flow detection devices are installed in both the conventional drainage path and the emergency drainage path. The drainage control valves are used to switch the opening and closing of the drainage path according to the control command during operation. The flow detection devices are used to monitor the drainage flow in real time. The switching between the conventional drainage path and the emergency drainage path is controlled by a distributed control system.

[0067] In some specific embodiments, step S200 specifically includes:

[0068] Step S200.1: Collect hydrophobic water quality monitoring data, compare it with the threshold, configure the hydrophobic path switching judgment function, and execute the hydrophobic path switching logic.

[0069] In the initial stage of operation of the heating network heater, the distributed control system receives real-time monitoring data from online conductivity analyzers, online pH analyzers, and online iron ion analyzers installed on the conventional drainage path and the emergency drainage path. The water quality judgment standard consists of conductivity judgment threshold, pH judgment threshold, and iron ion judgment threshold as follows: the conductivity judgment threshold is set to less than or equal to 2.0 microsiemens / cm, the pH judgment threshold is set to 9.0 to 10.0, and the iron ion judgment threshold is set to less than or equal to 0.10 mg / L.

[0070] When the real-time monitoring values ​​of conductivity, pH, and iron ions received by the distributed control system simultaneously meet the above three judgment thresholds, the hydrophobic water quality is judged as qualified hydrophobic. If any parameter exceeds the threshold range, it is judged as unqualified hydrophobic.

[0071] The distributed control system uses a decision function to perform logical judgments on real-time sampled data. The hydrophobic water quality decision function serves as the trigger condition input for the control logic, directly determining the switching state of the hydrophobic path, specifically:

[0072]

[0073] In the formula: Q(t) is the output of the hydrophobic water quality judgment function. A value of 1 indicates qualified hydrophobicity, and a value of 0 indicates unqualified hydrophobicity. EC(t) is the real-time monitoring value of conductivity at the current moment, in microsiemens / cm. pH(t) is the real-time monitoring value of pH at the current moment. Fe(t) is the real-time monitoring value of iron ions at the current moment, in milligrams / liter. QtQk represents other cases.

[0074] When the output of the condensate quality judgment function is 0, the distributed control system issues a control command to close the condensate control valve on the normal condensate path and open the condensate control valve on the emergency condensate path, discharging the unqualified condensate into the waste heat boiler's scheduled discharge pipeline. When the output of the condensate quality judgment function is 1, the distributed control system issues a control command again to open the condensate control valve on the normal condensate path and close the condensate control valve on the emergency condensate path, allowing the condensate to re-enter the condensate header, thus achieving condensate recycling.

[0075] Step S200.2: Configure automatic switching and manual intervention mechanisms, and set switching action confirmation and safety delay.

[0076] The entire process of switching the drainage path is automatically executed by the distributed control system, which also has a manual intervention function. Operators can directly issue valve opening or closing commands by selecting the manual switching button for the normal drainage path or the emergency drainage path in the operation interface of the distributed control system, so as to realize manual switching. In an emergency, operators can immediately switch the drainage path through the manual intervention function.

[0077] After issuing the drain path switching command, the distributed control system collects the on / off status signals of the drain control valve and the monitoring data of the flow detection device in real time to confirm whether the valve action and flow change are consistent. When executing the drain path switching logic, the distributed control system sets a 30-second delay confirmation mechanism. If the drain is determined to be unqualified, it must be determined to be unqualified three times in a row within 30 seconds before switching to the emergency drain path. If the drain is determined to be qualified, it must be determined to be qualified three times in a row within 30 seconds before switching to the normal drain path.

[0078] In some specific embodiments, step S300 specifically includes:

[0079] Step S300.1: Configure the online monitoring module for condensate water quality, establish a data input channel, set up a water quality compliance control module, and bind the judgment logic.

[0080] Both the conventional and emergency drainage paths are equipped with online water quality monitoring modules. These modules consist of an online conductivity analyzer, an online pH analyzer, and an online iron ion analyzer. The three types of online analyzers introduce the sampled water flow through the sampling port of the main drainage pipe and complete the electrical signal conversion on-site.

[0081] The 4–20 mA signal output by the online conductivity analyzer corresponds to a conductivity range of 0.01 μSiemens / cm to 500 μSiemens / cm, the 4–20 mA signal output by the online pH analyzer corresponds to a pH range of 0 to 14, and the 4–20 mA signal output by the online iron ion analyzer corresponds to an iron ion concentration range of 0 mg / L to 2.00 mg / L. All monitoring signals are connected to the input module of the distributed control system via fieldbus, and the distributed control system timestamps them at a resolution of one second and enters them into the historical database.

[0082] A water quality compliance control module is set up in the distributed control system. The functions of the water quality compliance control module include: collecting real-time data from the online conductivity analyzer, online pH analyzer and online iron ion analyzer; calling the hydrophobic water quality judgment logic unit to perform threshold comparison and status judgment; and feeding back the judgment result to the hydrophobic control valve execution unit to decide whether to continue to maintain the normal hydrophobic path or switch to the emergency hydrophobic path.

[0083] The input to the hydrophobic water quality determination logic unit is real-time sampled data, and the output is a qualified hydrophobicity determination signal or a failed hydrophobicity determination signal. The specific determination rules are as follows:

[0084]

[0085] In the formula: X avg (t) is the moving average value at the current time, X(ti) is the valid data value at the current time and the previous two sampling periods, t is the current sampling time, and i is the sampling number, with a value range of 0 to 2.

[0086] Step S300.2: Set the threshold for water quality compliance for condensate drainage, establish an early warning mechanism, and configure dynamic adjustment and path control strategies.

[0087] The water quality compliance control module has the following threshold settings: conductivity threshold, pH threshold and iron ion threshold.

[0088] The conductivity sliding average value is less than or equal to 2.0 μSiemens / cm for qualified, and greater than 2.0 μSiemens / cm for unqualified. The pH determination threshold pH sliding average value is between 9.0 and 10.0 for qualified, and less than 9.0 or greater than 10.0 for unqualified. The iron ion determination threshold iron ion sliding average value is less than or equal to 0.10 mg / L for qualified, and greater than 0.10 mg / L for unqualified.

[0089] When the real-time sampling data approaches the boundary threshold, the water quality compliance control module automatically triggers the early warning mechanism. The boundary threshold is defined as: conductivity between 1.8 and 2.0 microsiemens / cm, pH between 8.9 and 9.0 or between 10.0 and 10.1, and iron ion concentration between 0.09 and 0.10 mg / L. When the warning range is entered, the distributed control system automatically issues an audible and visual alarm and generates a prompt message on the operator interface, indicating to the operators that the effluent water quality is approaching an unqualified state.

[0090] When the water quality compliance control module determines that the drainage is qualified, the distributed control system keeps the normal drainage path open. When the water quality compliance control module determines that the drainage is unqualified, the distributed control system executes the defined automatic switching action and switches the drainage path to the emergency drainage path. If the water quality is in an early warning state, the distributed control system does not switch immediately, but takes dynamic adjustment measures.

[0091] The dynamic adjustment measures include: reducing the opening of the conventional drainage path control valve to 80% of the original set value, while adjusting the opening of the emergency drainage path control valve to 20%, forming a dual-path partial diversion operation mode. The distributed control system re-determines the water quality status within 30 seconds. If the three consecutive sliding average values ​​are still in the warning range, the diversion operation is maintained. If it enters the qualified range, the conventional drainage path is restored to full opening. If it enters the unqualified range, it switches to the emergency drainage path being fully open.

[0092] In some specific embodiments, step S400 specifically includes:

[0093] Step S400.1: Identify abnormal operating conditions based on the water quality compliance control results, and formulate an emergency drainage path maintenance strategy based on the abnormal operating condition identification results.

[0094] When the distributed control system receives data transmitted by the online water quality monitoring module and calls the water quality compliance control module to determine that the condensate water quality is continuously unqualified and the unqualified period lasts for more than 5 minutes, the distributed control system determines that it has entered an abnormal water quality condition. When the water quality is in the warning range and the warning state lasts for more than 10 minutes, the distributed control system also determines that it has entered an abnormal water quality condition.

[0095] In the event of abnormal water quality, the distributed control system immediately keeps the emergency drainage path control valve fully open while closing the regular drainage path control valve, so that all drainage is discharged through the emergency drainage path. At the same time, the distributed control system issues a command to start the backup drainage cooler, which cools the drainage entering the emergency drainage path to a safe discharge temperature of 70°C to 90°C before discharging it into the waste heat boiler's fixed discharge pipeline.

[0096] Step S400.2: Trigger the emergency response procedure and set the segmented adjustment strategy based on the abnormal operating condition identification results, and judge the abnormal trend based on the abnormal operating condition identification results.

[0097] The distributed control system accumulates the duration of abnormal water quality conditions in real time. When the abnormal duration exceeds 30 minutes, the distributed control system automatically triggers the emergency response procedure. The emergency response procedure includes: uploading the emergency condition status signal to the operation record system, saving the real-time monitoring values ​​of conductivity, pH, and iron ions, as well as the hydrophobic flow data collected by the flow detection device, and writing the saved data into the historical database at a resolution of 1 second for subsequent abnormal condition analysis and optimization of control strategies.

[0098] After the emergency response procedure is triggered, the distributed control system enters a segmented adjustment mode. When the real-time conductivity monitoring value recovers to less than or equal to 2.5 μSiemens / cm, the real-time pH monitoring value is between 8.8 and 10.2, and the real-time iron ion monitoring value recovers to less than or equal to 0.15 mg / L, the distributed control system gradually adjusts the opening of the emergency drainage path control valve from 100% to 50%, and simultaneously gradually adjusts the opening of the regular drainage path control valve from 0% to 50%, forming a dual-path diversion operation. In the diversion operation mode, the distributed control system is set with a 30-second confirmation mechanism. When the water quality judgment signal is qualified for drainage for three consecutive monitoring cycles, the opening of the regular drainage path control valve is adjusted to 100%, and the emergency drainage path control valve is closed. If any judgment parameter exceeds the set threshold again in the diversion operation mode, the distributed control system immediately reverts to the fully open state of the emergency drainage path.

[0099] During abnormal operating condition analysis, the distributed control system calls the abnormal trend judgment formula to judge the trend of the real-time conductivity monitoring value, specifically:

[0100]

[0101] In the formula: T EC EC(t) represents the rate of change of conductivity, in microsiemens per centimeter per minute. EC(t) is the real-time conductivity value at the current moment, and EC(t-5) is the real-time conductivity value 5 minutes ago.

[0102] When the rate of change of conductivity is less than -0.05 microsiemens / cm·min, it indicates that the conductivity is gradually decreasing and the water quality is in a recovery trend. When the rate of change of conductivity is greater than 0.05 microsiemens / cm·min, it indicates that the conductivity is gradually increasing and the water quality is in a deterioration trend.

[0103] Based on the trend of the change rate of conductivity, the distributed control system decides whether to extend the opening time of the emergency drainage path or to start the diversion operation mode in advance.

[0104] In some specific embodiments, step S500 specifically includes:

[0105] Step S500.1: Configure the conditions for adding makeup water and configure the chemical makeup water treatment system.

[0106] When the distributed control system receives real-time monitoring data from the online water quality monitoring module and the flow detection device, and determines that the condensate water quality has been unqualified for a long period of time, the emergency condensate path has been kept fully open for more than 60 minutes, and the condensate recovery rate is lower than the set threshold of 70%, the distributed control system automatically activates the chemical makeup water treatment system. The chemical makeup water treatment system includes a two-stage reverse osmosis unit and a mixed ion exchanger. The two-stage reverse osmosis unit is used to remove dissolved salts from the water, and the mixed ion exchanger is used to further remove residual ions from the water.

[0107] The operation process of the chemical makeup water treatment system is as follows: Raw water first enters the secondary reverse osmosis unit. The operating pressure of the secondary reverse osmosis unit is controlled between 1.0 MPa and 1.6 MPa, and the desalination rate is greater than 99%. The product water from the secondary reverse osmosis unit flows into the mixed ion exchanger. The mixed ion exchanger is filled with strong acid cation exchange resin and strong base anion exchange resin to further remove residual sodium ions, calcium ions, chloride ions, and sulfate ions from the secondary reverse osmosis product water. The effluent from the mixed ion exchanger is demineralized water with a conductivity of less than or equal to 0.2 μSiemens / cm and dissolved oxygen of less than or equal to 10 μg / L.

[0108] Step S500.2: Configure the replenishment water addition and adjustment, and configure the dual-constraint circulating water quality maintenance.

[0109] The distributed control system collects real-time water level monitoring data from the water tank level gauges in the heating network, and uses monitoring data from the condensate flow detection device and the makeup water flow meter to establish a balance formula for the condensate recovery rate and the makeup water dosage, specifically:

[0110] W tank (t)=W tank (t-1)+Q return (t)+Q makeup (t)-Q cons (t)

[0111] In the formula: W tank (t) represents the current water level in the heating network tank, in meters (W). tank (t-1) represents the water level in the heating network tank at the previous moment, in meters. Q return (t) represents the current hydrophobic recovery flow rate, in tons per hour. makeup (t) represents the current water supply flow rate, in tons per hour. cons(t) represents the current water consumption of the heating network system, in tons per hour.

[0112] The distributed control system calculates the water level changes in the heating network tank in real time according to the formula and sets the water level control threshold: when the water level in the heating network tank is below 1.2 meters, the amount of makeup water added is increased; when the water level in the heating network tank is above 2.0 meters, the amount of makeup water added is reduced; when the water level in the heating network tank is between 1.5 meters and 1.8 meters, a dynamic balance between makeup water addition and drainage recovery is maintained.

[0113] During the makeup water dosing process, the distributed control system uses real-time data from the online conductivity analyzer and the online dissolved oxygen analyzer to determine water quality constraints: when the real-time conductivity monitoring value is less than or equal to 2.0 μS / cm, it is determined to be qualified circulating water; when the real-time dissolved oxygen monitoring value is less than or equal to 20 μg / L, it is determined to be qualified circulating water. If the conductivity or dissolved oxygen exceeds the above thresholds, the distributed control system automatically reduces the makeup water dosing rate and triggers an audible and visual alarm, prompting operators to check the operating status of the secondary reverse osmosis unit and the mixed ion exchanger.

[0114] In some specific embodiments, step S600 specifically includes:

[0115] Step S600.1: Configure the hydrophobic operation data record and time series database, and configure the hydrophobic operation index statistics and evaluation model.

[0116] During the process of switching between multiple paths for condensate drainage in the heating network heater and controlling water quality compliance, the distributed control system records the condensate drainage path switching status signal, the real-time conductivity monitoring value, the real-time pH monitoring value, the real-time iron ion monitoring value collected by the online water quality monitoring module, the condensate drainage flow data collected by the condensate drainage flow detection device, and the makeup water flow data of the chemical makeup water treatment system.

[0117] The recorded data is written to the time series database in the form of timestamps, with a sampling period of 1 second. The database stores the following: real-time conductivity monitoring value, real-time pH monitoring value, real-time iron ion monitoring value, hydrophobic recovery flow rate, emergency hydrophobic discharge flow rate, makeup water addition flow rate, water level monitoring value of the heating network tank, and operating status signals and effluent conductivity data of the secondary reverse osmosis unit and the mixed ion exchanger.

[0118] Based on a time-series database, the distributed control system calculates key operating indicators through a data analysis module, including hydrophobic switching frequency, water quality compliance rate, hydrophobic recovery rate, and heat recovery rate.

[0119] The hydrophobic recovery rate is calculated as follows:

[0120]

[0121] In the formula: R rec (t) represents the hydrophobic recovery rate for the current statistical period, expressed as a percentage. return (t) represents the cumulative flow of condensate collected into the condensate header during the statistical period, expressed in tons. dis (t) represents the cumulative flow of drainage discharged through the accident drainage path within the statistical period, in tons.

[0122] The water quality compliance rate is calculated as follows:

[0123]

[0124] In the formula: P qual (t) represents the compliance rate of condensate water quality for the current statistical period, expressed as a percentage. N qual (t) represents the number of sampling points N that simultaneously meet the qualified thresholds for conductivity, pH, and iron ion concentration. total (t) represents the total number of sampling points within the statistical period.

[0125] The heat recovery rate is calculated as follows:

[0126]

[0127] In the formula: E rec (t) represents the heat recovery rate, expressed as a percentage, in C. w The specific heat capacity is hydrophobic, and is taken as 4.19 kJ / (kg·℃). sw (t) represents the current hydrophobic temperature, in °C (T). ref The reference temperature is 25℃, and T is the statistical duration in hours.

[0128] Step S600.2: Set up operation optimization and threshold correction strategies, and verify personnel operations and strategies.

[0129] Based on the statistical results of hydrophobic recovery rate, water quality compliance rate, and heat recovery rate, the data analysis module optimizes the hydrophobic path switching threshold, makeup water dosing parameters, and water quality warning boundaries: When the hydrophobic recovery rate is below 80% and the water quality compliance rate is above 95%, it is recommended to appropriately relax the conductivity cut-off threshold from 1.90 μSiemens / cm to 2.10 μSiemens / cm. When the heat recovery rate is below 85% and the emergency hydrophobic path opening time exceeds 30 minutes / day, it is recommended to narrow the upper limit of the warning interval, adjusting the conductivity warning range from 1.8–2.0 μSiemens / cm to 1.7–1.9 μSiemens / cm. When conductivity or iron ion concentration fluctuates frequently during operation, triggering multiple threshold switching, the distributed control system calls a smoothing correction algorithm to perform weighted optimization of the switching judgment function parameters, specifically:

[0130] θ new =α·θ current +(1-α)·θ mean

[0131] In the formula: θ new For the corrected threshold, θ current θ is the current threshold. mean The mean of the optimal threshold over the past statistical period is α, which is a smoothing factor ranging from 0.6 to 0.8.

[0132] After receiving optimization suggestions from the data analysis module, operators can manually confirm and correct parameters in the strategy management interface of the distributed control system. The distributed control system provides simulation verification functions, allowing operators to verify the impact of new thresholds on hydrophobic recovery rate and water quality stability under virtual operating conditions.

[0133] In practical application, the above involves first configuring tubular heating network heaters in the heating network circulating water system, and then constructing a multi-path condensate discharge system at the outlet of the tubular heating network heaters. The multi-path condensate discharge system includes a conventional condensate path and an emergency condensate path. The conventional condensate path is used to recover condensate that meets the circulating water standards to the condensate header to achieve heat recovery. The emergency condensate path is used to discharge condensate into the waste heat boiler's fixed discharge pipeline when the condensate quality does not meet the set standards, in order to avoid contaminating the circulating water. Condensate control valves and flow detection devices are installed on the conventional condensate path and the emergency condensate path, respectively. The distributed control system manages the opening and closing status of the condensate control valves and the condensate flow rate throughout the entire process.

[0134] Subsequently, when the heating network heaters are put into operation, the distributed control system receives real-time monitoring data from online conductivity analyzers, online pH analyzers, and online iron ion analyzers. The conductivity threshold is no greater than 2.0 μSiemens / cm, the pH threshold is 9.0 to 10.0, and the iron ion threshold is no greater than 0.10 mg / L. The distributed control system performs logical judgments on the real-time monitoring values ​​of conductivity, pH, and iron ion. When all three parameters are within the threshold range, the condensate is determined to be qualified condensate, and the condensate is recovered through the conventional condensate path. When any monitoring value exceeds the threshold, the condensate is determined to be unqualified condensate. The distributed control system closes the conventional condensate path control valve and opens the emergency condensate path control valve, directing the condensate into the waste heat boiler's stator to prevent contamination of the circulating water.

[0135] Subsequently, the distributed control system activates a safety confirmation mechanism when switching drainage paths. If the drainage water quality is determined to be substandard, the system will only switch to the emergency drainage path if three consecutive tests within 30 seconds show substandard drainage water quality. If the drainage water quality is determined to be acceptable, the system will only resume normal drainage path operation if three consecutive tests within 30 seconds show acceptable drainage water quality. Operators can select the manual switching button in the distributed control system's interface to directly operate the control valves of the normal or emergency drainage path, enabling manual intervention. In manual switching mode, the distributed control system still records valve opening and closing signals and drainage flow rate, providing complete data for operational analysis.

[0136] Next, the condensate from the heating network heaters is continuously monitored by an online water quality monitoring module consisting of an online conductivity analyzer, an online pH analyzer, and an online iron ion analyzer. The data is timestamped and written to the historical database at a one-second resolution. The distributed control system then calls the water quality compliance control module to compare the monitoring data with the water quality compliance thresholds. These thresholds include: conductivity not exceeding 2.0 μS / cm, pH between 9.0 and 10.0, and iron ion concentration not exceeding 0.10 mg / L. The water quality compliance control module has an early warning mechanism. When the conductivity is between 1.8 and 2.0 μSiemens / cm, or the pH value is between 8.9 and 9.0 or between 10.0 and 10.1, or the iron ion concentration is between 0.09 and 0.10 mg / L, the distributed control system triggers an audible and visual alarm to remind operators that the condensate water quality is approaching an unacceptable state. Under the warning state, the distributed control system adjusts the opening of the regular condensate path control valve to 80% and the opening of the emergency condensate path control valve to 20%, forming a partial diversion operation mode, and reassesses the water quality status within 30 seconds.

[0137] Then, when the condensate water quality is continuously substandard for more than 5 minutes, the distributed control system determines it to be an abnormal water quality condition. It immediately keeps the emergency condensate path fully open while closing the regular condensate path to prevent substandard condensate from flowing back into the heating network. Under the abnormal water quality condition, the distributed control system starts the backup condensate cooler to cool the condensate entering the emergency condensate path to 70°C to 90°C before discharging it into the waste heat boiler's fixed discharge pipeline. When the abnormal water quality lasts for more than 30 minutes, the distributed control system automatically triggers the emergency procedure, writing the real-time conductivity, pH, and iron ion monitoring values ​​and condensate flow rate into the historical database and starting the segmented adjustment mode. When the conductivity is no greater than 2.5 μSiemens / cm, the pH is between 8.8 and 10.2, and the iron ion is no greater than 0.15 mg / L, the system gradually adjusts the control valve openings of the emergency condensate path and the regular condensate path to 50%, forming a dual-path diversion operation. After three consecutive cycles of testing show qualified condensate, the regular condensate path is fully opened and the emergency condensate path is closed.

[0138] Finally, if the condensate drain fails to meet standards for an extended period and the emergency condensate drain path remains fully open for more than 60 minutes, while the condensate recovery rate is below 70%, the decentralized control system activates the chemical makeup water treatment system. This system includes a two-stage reverse osmosis unit and a mixed ion exchanger. The two-stage reverse osmosis unit operates at a pressure of 1.0 MPa to 1.6 MPa, achieving a desalination rate greater than 99% and a permeate conductivity of no more than 0.2 μSiemens / cm. The mixed ion exchanger further treats the permeate from the two-stage reverse osmosis unit, ensuring that the dissolved oxygen in the effluent is no more than 10 μg / L. The decentralized control system then injects makeup water into the heating network water tank, adjusting the tank level in real time according to the balance formula between the condensate recovery flow rate and the makeup water flow rate. The tank level is maintained between 1.5 meters and 1.8 meters, with a conductivity not exceeding 2.0 μSiemens / cm and dissolved oxygen not exceeding 20 μg / L, ensuring stable circulating water quality and improving heat recovery efficiency.

Claims

1. A heat network heater drain multi-path switching and water quality up-to-standard control process, characterized in that, It comprises the following steps: S100, configure the basis of the heat network heater drainage system, including: conventional drainage path and accident drainage path; The conventional drainage path is composed of a drainage pump, a drainage pipeline, a drainage control valve, and a pipeline connected to the condensate main pipe. The accident drainage path is composed of a drainage pipeline, an accident drainage control valve, and a discharge interface connected to the fixed drainage pipeline of the waste heat boiler; S200, collect drainage water quality monitoring data and compare it with the threshold value, configure the drainage path switching judgment function, and perform the drainage path switching execution logic, configure the automatic switching and manual intervention mechanism, and set the switching action confirmation and safety delay; S300, configure the drainage water quality online monitoring module, establish the data input channel, set up the water quality standard control module, bind the judgment logic, set the drainage water quality standard threshold, and establish the early warning mechanism, configure the dynamic adjustment and path control strategy; S400, based on the abnormal working condition recognition result, the accident drainage path maintenance strategy, the accident emergency program triggering and segmented adjustment strategy setting, and the abnormal trend judgment; S500, configure the makeup water addition start condition, configure the chemical makeup water treatment system and makeup water addition adjustment, configure the double-constrained circulating water quality maintenance; S600, configure the drainage operation data record and time series database, configure the drainage operation index statistics and evaluation model, set the operation optimization and threshold correction strategy, and perform personnel operation and strategy verification.

2. The process of claim 1, wherein, The S100 specifically comprises: S100.1, configure the basis of the heat network heater drainage system, including: conventional drainage path and accident drainage path; In the heat network circulating water system, a tubular heat network heater is arranged, and a multi-path drainage discharge system is constructed on the outlet side of the tubular heat network heater, the multi-path drainage discharge system including: a conventional drainage path and an accident drainage path; The conventional drainage path is used to transport the drainage generated in the heat network heater running process to the condensate main pipe under conventional working conditions, and the accident drainage path is used to discharge the drainage into the fixed drainage pipeline of the waste heat boiler during the start-up stage of the heat network heater or when the drainage water quality generated by the heat network heater does not meet the set standard; In the conventional drainage path and the accident drainage path, independent drainage control valves and flow detection devices are installed, the drainage control valves are used to realize the opening and closing switching of the drainage path according to the control instructions during the running process, and the flow detection devices are used to monitor the drainage flow in real time, and the switching of the conventional drainage path and the accident drainage path is controlled by the distributed control system.

3. The process of claim 1, wherein the process further comprises: The S200 specifically comprises: S200.1, collect drainage water quality monitoring data and compare it with the threshold value, configure the drainage path switching judgment function, and perform the drainage path switching execution logic; In the initial stage of the operation of the heat network heater, the distributed control system receives real-time monitoring data of the conductivity online analyzer, the pH online analyzer and the iron ion online analyzer installed on the conventional drainage path and the emergency drainage path, and the water quality determination criteria are composed of the conductivity determination threshold, the pH determination threshold and the iron ion determination threshold: the conductivity determination threshold is set to be less than or equal to 2.0 microsiemens / centimeter, the pH determination threshold is set to be 9.0 to 10.0, and the iron ion determination threshold is set to be less than or equal to 0.10 mg / L; When the conductivity real-time monitoring value, the pH real-time monitoring value and the iron ion real-time monitoring value received by the distributed control system simultaneously satisfy the above three determination thresholds, the drainage water quality is determined to be qualified drainage, and if any parameter exceeds the threshold range, it is determined to be unqualified drainage; The distributed control system uses a determination function to logically judge the real-time sampling data, the drainage water quality determination function is input as the trigger condition of the control logic, and directly determines the switching state of the drainage path; When the drainage water quality determination function output is 0, the distributed control system issues a control instruction to close the drainage control valve on the conventional drainage path and simultaneously open the drainage control valve on the emergency drainage path, and unqualified drainage is discharged into the waste heat boiler fixed discharge pipeline, when the drainage water quality determination function output is 1, the distributed control system reissues a control instruction to open the drainage control valve on the conventional drainage path and close the drainage control valve on the emergency drainage path, so that the drainage reenters the condensate water main pipe, realizing the recycling of the drainage; S200.2, configure an automatic switching and manual intervention mechanism, and set a switching action confirmation and safety delay; The whole process of the drainage path switching is automatically executed by the distributed control system and has a manual intervention function, and the operator can directly issue an open valve or close valve instruction by selecting the manual switching button of the conventional drainage path or the emergency drainage path in the operation interface of the distributed control system, to realize manual switching, and in an emergency, the operator can immediately switch the drainage path through the manual intervention function; After the distributed control system issues a drainage path switching instruction, it collects the open / close state signal of the drainage control valve and the monitoring data of the flow detection device in real time, to confirm whether the valve action and the flow change are consistent, and the distributed control system sets a 30-second delay confirmation mechanism when executing the drainage path switching logic, when it is determined to be unqualified drainage, it needs to be continuously determined to be unqualified drainage for three times within 30 seconds, and only then will it be switched to the emergency drainage path, and when it is determined to be qualified drainage, it needs to be continuously determined to be qualified drainage for three times within 30 seconds, and only then will it be switched to the conventional drainage path.

4. The process of claim 1, wherein the process further comprises, The S300 specifically includes: S300.1, configure a drainage water quality online monitoring module, establish a data input channel, set up a water quality compliance control module, and bind a determination logic; In the conventional drainage path and the emergency drainage path, a water quality online monitoring module is arranged, the water quality online monitoring module is composed of a conductivity online analyzer, a pH online analyzer and an iron ion online analyzer, the three types of online analyzers introduce the sampling water flow through the sampling port of the drainage main pipe, and complete the electrical signal conversion on site; The 4-20 milliamp signal output by the conductivity online analyzer corresponds to a conductivity range of 0.01 microsiemens / cm to 500 microsiemens / cm, the 4-20 milliamp signal output by the pH online analyzer corresponds to a pH range of 0 to 14, and the 4-20 milliamp signal output by the iron ion online analyzer corresponds to an iron ion concentration range of 0 mg / L to 2.00 mg / L. The monitoring signals are input into a distributed control system input module through a field bus and are time-stamped by the distributed control system at a resolution of one second and entered into a historical database; A water quality compliance control module is set up in the distributed control system, and the functions of the water quality compliance control module include: collecting real-time data of the conductivity online analyzer, the pH online analyzer, and the iron ion online analyzer, calling a blowdown water quality judgment logic unit for threshold comparison and state judgment, and feeding back the judgment result to a blowdown control valve execution unit to determine whether to continue to maintain the normal blowdown path or switch to the emergency blowdown path; The input of the blowdown water quality judgment logic unit is real-time sampling data, and the output is a qualified blowdown judgment signal or an unqualified blowdown judgment signal; S300.2, setting a blowdown water quality compliance threshold and establishing a warning mechanism, configuring a dynamic adjustment and path control strategy; The judgment thresholds set in the water quality compliance control module include: a conductivity judgment threshold, a pH judgment threshold, and an iron ion judgment threshold; The conductivity sliding average value less than or equal to 2.0 microsiemens / cm is qualified, and more than 2.0 microsiemens / cm is unqualified. The pH sliding average value between 9.0 and 10.0 is qualified, and less than 9.0 or more than 10.0 is unqualified. The iron ion sliding average value less than or equal to 0.10 mg / L is qualified, and more than 0.10 mg / L is unqualified. When the real-time sampling data approaches the boundary threshold, the water quality compliance control module automatically triggers the warning mechanism. The approach to the boundary threshold is defined as: conductivity between 1.8 and 2.0 microsiemens / cm, pH between 8.9 and 9.0 or between 10.0 and 10.1, and iron ion concentration between 0.09 and 0.10 mg / L. When entering the warning interval, the distributed control system automatically issues an audible and visual alarm and generates a prompt message on the operator interface, prompting the operator that the blowdown water quality is approaching an unqualified state; When the water quality compliance control module determines that the blowdown water is qualified, the distributed control system keeps the normal blowdown path open. When the water quality compliance control module determines that the blowdown water is unqualified, the distributed control system performs a defined automatic switching action to switch the blowdown path to the emergency blowdown path. If the water quality determination is in a warning state, the distributed control system does not immediately switch, but takes dynamic adjustment measures. The dynamic adjustment measure comprises: reducing the opening degree of the conventional drainage path control valve to 80% of the original set value, and adjusting the opening degree of the emergency drainage path control valve to 20%, forming a double-path partial diversion operation mode, and the distributed control system re-judges the water quality state within 30 seconds, if the continuous three moving average values are still in the warning interval, the partial diversion operation is maintained, if it enters the qualified interval, the conventional drainage path is fully opened, if it enters the unqualified interval, the emergency drainage path is fully opened.

5. The process of claim 1, wherein the process further comprises: The S400 specifically comprises: S400.1, abnormal working condition identification based on water quality standard control results, and emergency drainage path maintenance strategy based on abnormal working condition identification results; When the distributed control system receives the data transmitted by the water quality online monitoring module, and calls the water quality standard control module to determine that the drainage water quality state is continuously unqualified, and the unqualified duration exceeds 5 minutes, the distributed control system determines that the water quality enters an abnormal working condition, when the water quality is in the warning interval and the warning state lasts more than 10 minutes, the distributed control system also determines that the water quality enters an abnormal working condition; Under the water quality abnormal working condition, the distributed control system immediately keeps the emergency drainage path control valve fully open, and closes the conventional drainage path control valve, so that all the drainage is discharged through the emergency drainage path, and the distributed control system simultaneously sends a command to start the standby drainage cooler, and the drainage entering the emergency drainage path is cooled to a safe discharge temperature of 70-90°C and then discharged into the waste heat boiler fixed discharge pipeline; S400.2, emergency program triggering and segmented adjustment strategy setting based on abnormal working condition identification results, and abnormal trend judgment based on abnormal working condition identification results; The distributed control system accumulates the duration after entering the water quality abnormal working condition in real time, when the abnormal duration exceeds 30 minutes, the distributed control system automatically triggers the emergency program, and the emergency program comprises: uploading the emergency working condition state signal to the operation record system, saving the real-time conductivity monitoring value, the real-time pH monitoring value, the real-time iron ion monitoring value and the drainage flow data collected by the flow detection device, writing the saved data into the historical database with 1 second resolution, for subsequent abnormal working condition analysis and optimization control strategy correction; The distributed control system enters a segmented regulation mode after triggering of an emergency procedure, and when the real-time monitoring value of the conductivity is restored to less than or equal to 2.5 microsiemens per centimeter, the real-time monitoring value of the pH is between 8.8 and 10.2, and the real-time monitoring value of the iron ion is restored to less than or equal to 0.15 mg / L, the distributed control system gradually adjusts the opening degree of the emergency blowdown path control valve from 100% to 50%, and gradually adjusts the opening degree of the normal blowdown path control valve from 0% to 50%, to form a double-path diversion operation. In the diversion operation mode, the distributed control system sets a 30-second confirmation mechanism. When the water quality determination signals of three consecutive monitoring cycles are all qualified blowdown, the opening degree of the normal blowdown path control valve is adjusted to 100%, and the emergency blowdown path control valve is closed. If any determination parameter again exceeds the set threshold value in the diversion operation mode, the distributed control system immediately returns to the full-opening state of the emergency blowdown path; In the abnormal working condition analysis process, the distributed control system calls an abnormal trend determination formula to determine the trend of the real-time monitoring value of the conductivity; When the conductivity change rate is less than -0.05 microsiemens per centimeter per minute, it indicates that the conductivity is gradually decreasing, and the water quality is in a recovery trend. When the conductivity change rate is greater than 0.05 microsiemens per centimeter per minute, it indicates that the conductivity is gradually increasing, and the water quality is in a deterioration trend. According to the trend determination result of the conductivity change rate, the distributed control system determines whether to extend the opening time of the emergency blowdown path or to start the diversion operation mode in advance.

6. The process of claim 1, wherein the process further comprises: The S500 specifically includes: S500.1, configure a make-up water dosing start condition, and configure a chemical make-up water treatment system; When the distributed control system receives real-time monitoring data from the water quality online monitoring module and the flow detection device, determines that the blowdown water quality is unqualified for a long time, the emergency blowdown path has been kept in full-opening operation for more than 60 minutes, and the blowdown recovery rate is lower than the set threshold value of 70%, the distributed control system automatically starts the chemical make-up water treatment system. The chemical make-up water treatment system includes a secondary reverse osmosis device and a mixed ion exchanger. The secondary reverse osmosis device is used to remove dissolved salts in water, and the mixed ion exchanger is used to further remove residual ions in water. The operation process of the chemical make-up water treatment system is as follows: raw water first enters the secondary reverse osmosis device. The operation pressure of the secondary reverse osmosis device is controlled at 1.0 MPa to 1.6 MPa, the desalination rate is greater than 99%, the secondary reverse osmosis device produces water, and the water flows into the mixed ion exchanger. The mixed ion exchanger is filled with strong acid cation exchange resin and strong base anion exchange resin, which is used to further remove residual sodium ions, calcium ions, chloride ions and sulfate ions in the secondary reverse osmosis water. The water discharged from the mixed ion exchanger is desalted water, the conductivity of which is less than or equal to 0.2 microsiemens per centimeter, and the dissolved oxygen is less than or equal to 10 micrograms per liter. S500.2, configure make-up water dosing adjustment, and configure double-constrained circulating water quality maintenance; The distributed control system collects water level monitoring data of the heat network water tank level gauge in real time, and calls monitoring data of the blowdown flow detection device and the make-up water flowmeter to establish a balance formula of the blowdown recovery amount and the make-up water dosing amount. The decentralized control system calculates the water level change of the heat network water tank in real time according to a formula and sets a water level control threshold: when the water level of the heat network water tank is lower than 1.2 meters, the make-up water injection amount is increased; when the water level of the heat network water tank is higher than 2.0 meters, the make-up water injection amount is reduced; and when the water level of the heat network water tank is in the range of 1.5 meters to 1.8 meters, the make-up water injection and the water recovery are dynamically balanced; In the process of make-up water injection, the decentralized control system calls data of the conductivity online analyzer and the dissolved oxygen online analyzer in real time to make water quality constraint judgment: when the real-time monitoring value of the conductivity is less than or equal to 2.0 microsiemens per centimeter, the circulating water is determined to be qualified; when the real-time monitoring value of the dissolved oxygen is less than or equal to 20 micrograms per liter, the circulating water is determined to be qualified; if the conductivity or the dissolved oxygen exceeds the threshold value, the decentralized control system automatically reduces the make-up water injection rate and triggers an audible and light alarm to prompt the operator to check the operation state of the secondary reverse osmosis device and the mixed ion exchanger.

7. The process of claim 1, wherein the process further comprises, The S600 specifically includes: S600.1, configuring a water recovery operation data record and a time series database, and configuring a water recovery operation index statistics and evaluation model; In the process of heat network heater water recovery multi-path switching and water quality standard control, the decentralized control system records the water recovery path switching state signal, the real-time monitoring value of the conductivity collected by the water quality online monitoring module, the real-time monitoring value of the pH, the real-time monitoring value of the iron ion, the water recovery flow data collected by the water recovery flow detection device, and the make-up water flow data of the chemical make-up water treatment system; The record data is written into the time series database in the form of a time stamp, the sampling period is set to 1 second, and the database storage content includes: the record data is written into the time series database in the form of a time stamp, the sampling period is set to 1 second, and the database storage content includes the real-time monitoring value of the conductivity, the real-time monitoring value of the pH, the real-time monitoring value of the iron ion, the water recovery flow, the emergency water discharge flow, the make-up water injection flow, the water level monitoring value of the heat network water tank, and the operation state signal and the water outlet conductivity data of the secondary reverse osmosis device and the mixed ion exchanger; On the basis of the time series database, the decentralized control system calculates key operation indexes, including the water recovery switching frequency, the water quality standard rate, the water recovery rate, and the heat energy recovery rate, through a data analysis module; S600.2, setting an operation optimization and threshold correction strategy, and performing personnel operation and strategy verification; The data analysis module optimizes the switch threshold of the drain path, the dosing parameters of make-up water and the water quality warning boundary according to the statistical results of the drain recovery rate, the water quality compliance rate and the heat recovery rate: when the drain recovery rate is lower than 80% and the water quality compliance rate is higher than 95%, it is suggested to appropriately relax the conductivity switch threshold, adjusting it from 1.90 μS / cm to 2.10 μS / cm; when the heat recovery rate is lower than 85% and the opening time of the emergency drain path is more than 30 minutes / day, it is suggested to narrow the upper limit of the warning interval, adjusting the conductivity warning range from 1.8-2.0 μS / cm to 1.7-1.9 μS / cm; when the conductivity or the iron ion concentration frequently fluctuates during operation, triggering multiple threshold switches, the distributed control system calls the smoothing correction algorithm to optimize the parameters of the switch determination function by weighting; After receiving the optimization suggestions output by the data analysis module, the operation personnel can perform manual confirmation and parameter correction operations on the strategy management interface of the distributed control system. The distributed control system provides a simulation verification function, allowing the operation personnel to verify the influence of the new threshold on the drain recovery rate and water quality stability under virtual working conditions.

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