A kind of integrated management system for continuous drainage

Abstract

The present invention relates to the technical field of boiler drainage resource recovery management, and proposes a drainage integrated management system. The specific implementation steps of the present invention include: real-time monitoring of drainage related parameters of the target boiler through sensors, and grouping and mixing wastewater from different pipelines; then, determining the inlet steam temperature through the steam-water mixing heat balance equation, and calculating the steam-water mixing heat loss; combining the heat conservation equation to determine the ideal steam output temperature, and calculating the waste heat recovery heat loss; then, constructing a steam-water pollution displacement function based on historical data; finally, constructing a drainage integrated optimization function based on the data of each module, optimizing it through a simulated annealing algorithm, and obtaining the best inlet steam data. The present invention realizes drainage treatment and energy efficiency optimization by comprehensively considering heat recovery, steam cost and pollution emissions.

Description

Technical Field

[0001] The invention relates to the technical field of boiler drainage resource recovery management, and in particular to a boiler drainage integrated management system. Background Art

[0002] Continuous drainage is the process in which the boiler drum continuously absorbs heat and water turns into steam in the drum. In order to ensure the quality of boiler water and steam, it is necessary to continuously discharge a part of the wastewater near the liquid surface, that is, continuous sewage discharge, referred to as continuous drainage. This part of the continuous drainage has a very high heat, which is equivalent to water close to 100°C under atmospheric pressure (0.1MPa). For example, for high-temperature and high-pressure boilers, continuous drainage is water at about 310°C under 9.8MPa pressure. If the boiler wastewater is not discharged in time, impurities will be deposited and the inner wall and pipelines of the boiler will be corroded, thereby affecting the operating efficiency and safety of the boiler. Therefore, the adoption of effective continuous drainage management can not only reduce the operating risks of the boiler, but also reduce energy waste, maximize the recovery of heat energy, reduce operating costs, and reduce water resource consumption.

[0003] At present, the existing technology usually uses flash recovery technology for steam recovery and heat recovery through heat exchange technology when recycling continuous drainage water. This not only causes a waste of some heat and water resources, but also causes the unused continuous drainage water to fail to meet the emission standards, thereby affecting the continuous drainage water recovery efficiency and increasing the cost of continuous drainage water treatment.

[0004] In order to solve the problems existing in the prior art, an integrated drainage management system is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a comprehensive management system for continuous drainage, which performs comprehensive management of continuous drainage by considering the heat loss, steam cost and pollution emission in the process of waste heat recovery of continuous drainage. In order to solve the above problems, the present invention first monitors the continuous drainage related parameters of the target boiler in real time through sensors, and groups and mixes the wastewater from different pipelines; then, the inlet steam temperature is determined by the steam-water mixing heat balance equation, and the steam-water mixing heat loss is calculated; the ideal steam output temperature is determined in combination with the heat conservation equation, and the waste heat recovery heat loss is calculated; then, a steam-water-pollution displacement function is constructed based on historical data; finally, a continuous drainage comprehensive optimization function is constructed by integrating the data of each module, and optimized by a simulated annealing algorithm to obtain the optimal inlet steam data. The present invention realizes continuous drainage treatment and energy efficiency optimization by comprehensively considering heat recovery, steam cost and pollution emission.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions: a water drainage integrated management system, comprising the following modules:

[0007] The wastewater data collection module monitors and collects the first-stage drainage data, second-stage drainage data, steam-water mixed steam data, pollution emission data and steam output temperature of several target boilers in real time through sensors;

[0008] The pipeline data monitoring module determines whether to perform pressure reduction treatment according to the first drainage data of the output wastewater for different target boilers; calculates the second drainage temperature difference and the second drainage pressure difference through the second drainage data, and performs wastewater grouping and mixing treatment; for the same group of wastewater, determines the inlet steam temperature by combining the second drainage data and the steam-water mixing heat balance equation; calculates the steam-water mixing heat loss through the steam-water mixing steam data and the ideal parameters of the mixed steam;

[0009] The waste heat recovery monitoring module of the water discharge system determines the ideal steam output temperature by combining the heat conservation equation and the steam-water mixed steam data; and calculates the waste heat recovery heat loss according to the steam output temperature and the ideal steam output temperature;

[0010] An emission monitoring module, which constructs a steam-water-pollution emission function according to the steam-water mixed steam data, the first continuous water discharge data and the historical pollution emission data at a historical time;

[0011] The integrated analysis module for continuous and draining water integrates the pipeline data monitoring module, the continuous and draining water waste heat recovery monitoring module and the emission monitoring module to construct a comprehensive optimization function for continuous and draining water, and optimizes it through a simulated annealing algorithm to obtain the best imported steam data.

[0012] Preferably, the first wastewater discharge data represents wastewater data detected at the wastewater outlet of the target boiler; the second wastewater discharge data represents wastewater data detected after the wastewater is depressurized by the wastewater expansion tank; the first wastewater discharge data, the second wastewater discharge data and the steam-water mixed steam data all include temperature, flow, pressure and compound concentration.

[0013] Preferably, the pipeline data monitoring module calculates the second water discharge temperature difference and the second water discharge pressure difference, and the process of performing wastewater grouping and mixed treatment includes:

[0014] According to the first drainage data of several target boilers, the corresponding first drainage pressure is obtained; if the first drainage pressure is greater than or equal to the predetermined pressure threshold, the wastewater of the target boiler is depressurized and the depressurized wastewater is output; according to the second drainage data of all the target boilers, the corresponding second drainage temperature and second drainage pressure are obtained, and the second drainage temperature difference and the second drainage pressure difference between different target boilers are calculated; if the second drainage temperature difference is less than the predetermined temperature difference threshold and the second drainage pressure difference is less than the predetermined pressure difference threshold, the wastewater in the corresponding pipeline is divided into a group for mixed treatment.

[0015] Preferably, the pipeline data monitoring module determines the inlet steam temperature by the steam-water mixing heat balance equation in a specific implementation process including:

[0016] The second drainage flow of the same group of wastewater is obtained, and the inlet steam pressure and the inlet steam flow are set. The inlet steam temperature is calculated by the steam-water mixing heat balance equation in combination with the second drainage temperature and the second drainage pressure. The calculation formula of the steam-water mixing heat balance equation is:

[0017] ;

[0018] in, represents the inlet steam flow rate; represents the inlet steam pressure; represents the gas constant of steam; represents the inlet steam temperature; 273.15 represents the value used for temperature unit conversion; represents the specific heat capacity of steam; represents the saturated steam temperature at the inlet steam pressure, obtained from the thermodynamic parameter table of saturated steam; Indicates The second drainage flow rate of the wastewater in the pipeline; Indicates the number of drainage pipes for mixing soda and water; It indicates the drainage density; Indicates The heat of evaporation required for the wastewater in the first pipe to evaporate at the second drainage pressure; Indicates The specific enthalpy of the wastewater in the first pipe at the second drainage pressure; represents the specific heat capacity of wastewater; Indicates The second discharge temperature of the wastewater in the pipeline; Indicates The saturated water temperature of the wastewater in a pipeline under the second drainage pressure.

[0019] Preferably, the specific implementation process of the pipeline data monitoring module calculating the heat loss of the steam-water mixture includes:

[0020] According to the steam-water mixed steam data, the mixed steam temperature, mixed steam pressure and mixed steam flow are obtained; through the ideal mixed steam parameters, the ideal mixed steam temperature and the ideal mixed steam pressure are obtained, and the steam-water mixed heat loss is calculated. The specific calculation formula is:

[0021] ;

[0022] in, represents the heat loss of the soda-water mixture; represents the mixed steam flow rate; represents the specific enthalpy of saturated steam at the mixed steam pressure; represents the specific enthalpy of saturated steam at the ideal pressure of the mixed steam; represents the specific heat capacity of steam; represents the mixed steam temperature; represents the temperature of saturated steam at the mixed steam pressure; Indicates the ideal temperature of the mixed steam; It represents the temperature of saturated steam at the ideal pressure of the mixed steam.

[0023] Preferably, the drainage waste heat recovery monitoring module obtains the mixed steam temperature, mixed steam pressure and mixed steam flow rate according to the steam-water mixed steam data; obtains the desalted water flow rate and initial temperature, and calculates the ideal steam output temperature through the heat conservation equation; and determines the waste heat recovery heat loss in combination with the steam output temperature.

[0024] Preferably, the specific implementation process of the emission monitoring module constructing the steam-water-pollution emission function includes:

[0025] Acquire the steam-water mixed steam data at historical time, the chemical concentration of the first continuous water discharge data and the corresponding historical pollution emission data;

[0026] The steam-water-pollution discharge function is constructed according to the steam-water mixed steam data at the historical time, the chemical concentration of the first continuous water discharge data and the historical pollution emission data.

[0027] Preferably, the combined drainage comprehensive analysis module obtains the inlet steam temperature, the steam-water mixing heat loss, the waste heat recovery heat loss and the steam-water-pollution displacement function respectively through the pipeline data monitoring module, the combined drainage waste heat recovery monitoring module and the emission monitoring module; determines the heat recovery loss by combining the steam-water mixing heat loss and the waste heat recovery heat loss; calculates the inlet steam cost through the inlet steam temperature; and constructs the combined drainage comprehensive optimization function by combining the heat recovery loss, the inlet steam cost and the steam-water-pollution displacement function;

[0028] The formula of the combined drainage optimization function is expressed as:

[0029] ;

[0030] in, Represents the comprehensive optimization function of the continuous drainage Find the minimum value; Indicates inlet steam data, including inlet steam temperature, inlet steam pressure and inlet steam flow rate; represents the heat recovery cost; represents the heat loss of the soda-water mixture; represents the waste heat recovery heat loss; denotes said imported steam cost; Indicates the historical pollution emission data The soda-water-pollution emission function of the emission components; Indicates The cost of treating each emission component; The number of types of emission components; , and represents an optimization weight coefficient, which is used to measure the influence factor of the heat recovery loss, the imported steam cost and the steam-water-pollution displacement function on the combined drainage comprehensive optimization function; , and The mean value interval of Inside, and .

[0031] Preferably, the inlet steam cost is calculated by the inlet steam temperature, and the specific calculation formula is:

[0032] ;

[0033] in, denotes said imported steam cost; represents the inlet steam quality, which is obtained by the inlet steam pressure and the inlet steam flow rate; It represents the specific enthalpy of inlet steam; represents the specific heat capacity of steam; Indicates the inlet steam temperature and the saturated steam temperature at the inlet steam pressure The temperature difference between Indicates the energy density of the fuel; It represents the heat conversion efficiency; Indicates the gas cost.

[0034] Preferably, the specific implementation process of optimizing by simulated annealing algorithm to obtain the optimal inlet steam data includes:

[0035] Initialize an initial solution , i.e. the initial inlet steam data, and set a predetermined temperature reduction coefficient and a maximum number of iterations; in each iteration, according to the current solution Generate a neighborhood solution ; Calculate the current solution With neighborhood solution The value of the combined optimization function of drainage and consolidation; judging whether to solve the neighborhood by the Metropolis criterion Update to new current solution If updated, the temperature parameters in the current solution are reduced according to the predetermined temperature reduction coefficient; whether the termination condition is met is determined, and if the termination condition is met, the current solution is returned as the optimal inlet steam data; if the termination condition is not met, the next round of iteration is continued.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] 1. The pipeline data monitoring module proposed in the present invention accurately monitors and optimizes the wastewater treatment and steam recovery processes, effectively optimizing the wastewater treatment process. According to the wastewater data of different pipelines, the wastewater is grouped and mixed, which helps to improve the wastewater treatment efficiency and heat recovery efficiency; by using the steam-water mixing heat balance equation to accurately calculate the inlet steam temperature, and combining the ideal parameters of the mixed steam to calculate the heat loss, the precise control of the steam-water mixed steam is achieved, reducing energy waste and improving thermal efficiency.

[0038] 2. The waste heat recovery monitoring module for continuous drainage proposed in the present invention obtains the mixed steam temperature, pressure and flow rate according to the steam-water mixed steam data, and calculates the ideal steam output temperature by the heat conservation equation in combination with the desalted water flow rate and initial temperature, which can accurately control the heat loss in the waste heat recovery process, thereby improving the thermal efficiency of the continuous drainage system. This module effectively reduces energy waste, improves the performance of the waste heat recovery system, optimizes the management of steam output temperature, and helps reduce energy consumption.

[0039] 3. The emission monitoring module proposed in the present invention can realize accurate prediction and control of emissions by constructing a steam-water-pollution emission function, which helps to optimize water discharge management, ensure that emissions meet environmental protection requirements, reduce pollutant emissions, and improve system operation efficiency.

[0040] 4. The integrated analysis module for continuous drainage proposed in the present invention can effectively improve the overall efficiency of continuous drainage management. By constructing a comprehensive optimization function for continuous drainage, it is possible to accurately evaluate and optimize the combined impact of heat recovery, steam cost and pollution emissions, thereby maximizing energy utilization and minimizing costs; in addition, the simulated annealing algorithm in the optimization process can accurately find the optimal inlet steam parameters through repeated iterations and gradual adjustments, further reducing heat loss and emissions, and improving the operating costs and environmental pollution of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A flowchart of specific implementation steps of a drainage integrated management system provided by an embodiment of the present invention;

[0042] Figure 2 A schematic diagram of the system structure of a drainage integrated management system provided by an embodiment of the present invention;

[0043] Figure 3 A flowchart of solving the combined optimization function of drainage and connection using a simulated annealing algorithm provided in an embodiment of the present invention;

[0044] Figure 4 An industrial flow chart for waste heat recovery from drainage provided in an embodiment of the present invention.

[0045] In the figure: 1. Boiler; 2. Continuous expansion tank; 3. Expansion tank electric valve; 4. Continuous pipeline electric valve; 5. Steam pipeline electric valve; 6. Steam output electric valve; 7. Boiler continuous waste heat recovery device; 8. Steam input electric valve. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Since boilers operate under high temperature and high pressure conditions, the discharged wastewater often contains a large amount of heat energy, chemicals and pollutants. Therefore, the reasonable treatment and recovery of boiler wastewater is of great significance to improving energy efficiency, reducing environmental pollution and reducing production costs. Through comprehensive management of continuous drainage, real-time monitoring and optimization of the entire process of boiler continuous drainage treatment can be achieved, the operating cost in the waste heat recovery process can be optimized, and the maximum recovery and utilization of heat energy can be achieved while ensuring that wastewater discharge meets environmental protection standards.

[0048] In order to illustrate the effectiveness of the integrated drainage management system proposed by the present invention, the specific implementation of the integrated drainage management system will be described in detail in combination with the accompanying drawings of this embodiment and the following two embodiments.

[0049] Embodiment 1

[0050] The present application embodiment will be combined with Figure 1 The specific implementation of a drainage integrated management system provided by the present invention is described. Figure 1 The flowchart is a specific implementation step of a water conduit integrated management system. The specific implementation steps of the water conduit integrated management system include: S1. Real-time monitoring and collection of the first water conduit data, the second water conduit data, the steam-water mixed steam data, the pollution emission data and the steam output temperature of several target boilers; S2. According to the first water conduit data, determine whether to perform decompression treatment; through the second water conduit data, perform wastewater grouping and mixing treatment; S3. Combine the steam-water mixed heat balance equation and the second water conduit data to determine the inlet steam temperature and calculate the steam-water mixed heat loss; S4. Combine the heat conservation equation steam-water mixed steam data to determine the ideal steam output temperature and calculate the waste heat recovery heat loss; S5. According to the steam-water mixed steam data, the first water conduit data and the historical pollution emission data, construct the steam-water-pollution displacement function; S6. Construct a comprehensive optimization function for water conduit, and optimize it through the simulated annealing algorithm to obtain the best inlet steam data.

[0051] The integrated drainage management system includes: a wastewater data acquisition module, a pipeline data monitoring module, a drainage waste heat recovery monitoring module, a discharge monitoring module and an integrated drainage analysis module; Figure 2, which is a system structure diagram of a continuous drainage integrated management system. Among them, the wastewater data acquisition module monitors and collects the first continuous drainage data, the second continuous drainage data, the steam-water mixed steam data, the pollution emission data and the steam output temperature of several target boilers in real time through sensors, corresponding to the above-mentioned step S1; the first continuous drainage data represents the wastewater data detected at the wastewater outlet of the target boiler; the second continuous drainage data represents the wastewater data detected after the continuous drainage is depressurized by the continuous drainage expansion tank; the first continuous drainage data, the second continuous drainage data and the steam-water mixed steam data all include temperature, flow, pressure and compound concentration.

[0052] Through real-time monitoring and data collection of the wastewater data collection module, the wastewater discharge status of the target boiler can be fully understood, thereby improving the management efficiency of continuous wastewater discharge. In addition, the monitoring of steam-water mixed steam data can help optimize the interaction between steam and water in boiler operation and reduce the cost and pollution emissions of boiler operation.

[0053] Furthermore, the pipeline data monitoring module determines whether to perform pressure reduction treatment for different target boilers according to the first drainage data of the output wastewater; calculates the second drainage temperature difference and the second drainage pressure difference through the second drainage data, and performs wastewater grouping and mixing treatment; corresponding to the above step S2, the specific implementation process includes:

[0054] According to the first drainage data of several target boilers, the corresponding first drainage pressure is obtained; if the first drainage pressure is greater than or equal to the predetermined pressure threshold, the wastewater of the target boiler is depressurized and the depressurized wastewater is output; according to the second drainage data of all the target boilers, the corresponding second drainage temperature and second drainage pressure are obtained, and the second drainage temperature difference and the second drainage pressure difference between different target boilers are calculated; if the second drainage temperature difference is less than the predetermined temperature difference threshold and the second drainage pressure difference is less than the predetermined pressure difference threshold, the wastewater in the corresponding pipeline is divided into a group for mixed treatment.

[0055] Through the above process, the treatment process of the target boiler wastewater can be effectively optimized, and the efficiency of wastewater reduction and resource recovery can be improved. By real-time monitoring of the first drainage pressure, it is possible to timely reduce the pressure when the pressure is too high, avoid damage to pipes or equipment, and ensure the safe and stable operation of the system; the calculation and analysis of the second drainage temperature and pressure difference, and group mixing treatment, not only improves the effect of wastewater treatment, but also avoids the treatment difficulties and adverse effects that may be caused by the mixing of wastewaters of different temperatures and pressures, and improves the efficiency of drainage treatment.

[0056] Furthermore, the pipeline data monitoring module corresponds to the same group of wastewater, combines the steam-water mixing heat balance equation and the second connected water discharge data to determine the inlet steam temperature; corresponding to the above step S3, specifically includes:

[0057] The second drainage flow of the same group of wastewater is obtained, and the inlet steam pressure and the inlet steam flow are set. The inlet steam temperature is calculated by the steam-water mixing heat balance equation in combination with the second drainage temperature and the second drainage pressure. The calculation formula of the steam-water mixing heat balance equation is:

[0058] ;

[0059] in, represents the inlet steam flow rate; represents the inlet steam pressure; represents the gas constant of steam; represents the inlet steam temperature; 273.15 represents the value used for temperature unit conversion; represents the specific heat capacity of steam; represents the saturated steam temperature at the inlet steam pressure, obtained from the thermodynamic parameter table of saturated steam; Indicates The second drainage flow rate of the wastewater in the pipeline; Indicates the number of drainage pipes for mixing soda and water; It indicates the drainage density; Indicates The heat of evaporation required for the wastewater in the first pipe to evaporate at the second drainage pressure; Indicates The specific enthalpy of the wastewater in the first pipe at the second drainage pressure; represents the specific heat capacity of wastewater; Indicates The second discharge temperature of the wastewater in the pipeline; Indicates The saturated water temperature of the wastewater in a pipeline under the second drainage pressure.

[0060] Through the steam-water mixing heat balance equation, the inlet steam temperature can be accurately calculated, thereby effectively improving the thermodynamic control accuracy of the steam and wastewater mixing process; by obtaining the second drainage data of the same group of wastewater, combined with the pressure and flow of the inlet steam, the steam parameters can be dynamically adjusted in real time to ensure the energy balance of the mixing process, improve the efficiency of wastewater heat recovery, and optimize the overall thermal utilization rate of the drainage system.

[0061] Furthermore, the pipeline data monitoring module calculates the steam-water mixed heat loss through the steam-water mixed steam data and the ideal parameters of the mixed steam; the specific implementation process includes:

[0062] According to the steam-water mixed steam data, the mixed steam temperature, mixed steam pressure and mixed steam flow are obtained; through the ideal mixed steam parameters, the ideal mixed steam temperature and the ideal mixed steam pressure are obtained, and the steam-water mixed heat loss is calculated. The specific calculation formula is:

[0063] ;

[0064] in, represents the heat loss of the soda-water mixture; represents the mixed steam flow rate; represents the specific enthalpy of saturated steam at the mixed steam pressure; represents the specific enthalpy of saturated steam at the ideal pressure of the mixed steam; represents the specific heat capacity of steam; represents the mixed steam temperature; represents the temperature of saturated steam at the mixed steam pressure; Indicates the ideal temperature of the mixed steam; It represents the temperature of saturated steam at the ideal pressure of the mixed steam.

[0065] Through the heat loss of steam-water mixture, the management of continuous drainage can be effectively optimized. By real-time monitoring of the temperature, pressure and flow of mixed steam and comparing them with ideal parameters, the heat loss can be accurately evaluated, so as to timely discover possible heat energy waste in the system, which not only improves the energy efficiency of the system and reduces unnecessary energy consumption, but also provides data support for equipment maintenance and enhances the stability and reliability of the system.

[0066] Further, see Figure 1 In step S4, the waste heat recovery monitoring module of the continuous water discharge obtains the mixed steam temperature, mixed steam pressure and mixed steam flow rate according to the steam-water mixed steam data; obtains the desalted water flow rate and initial temperature, and calculates the ideal steam output temperature through the heat conservation equation. The specific formula is expressed as follows:

[0067] ;

[0068] in, represents the ideal output temperature of the steam; represents the mixed steam temperature; Indicates the desalted water flow rate; Indicates the density of deionized water; It represents the heat capacity of desalinated water; Indicates the final temperature of the desalted water; represents the initial temperature of the desalted water; Indicates the gas constant of steam; 273.15 indicates the value used for temperature unit conversion; represents the mixed steam flow rate; represents the mixed steam pressure; represents the specific heat capacity of steam;

[0069] Combined with the steam output temperature, the waste heat recovery heat loss is determined, and the specific formula is:

[0070] ;

[0071] in, Represents the waste heat recovery heat loss.

[0072] The waste heat recovery monitoring module provided in the embodiment of the present application performs heat conservation calculation based on the steam data of the steam-water mixture, the desalted water flow rate and the initial temperature, and can accurately obtain the ideal output temperature of the mixed steam, and optimize the waste heat recovery process in combination with the steam output temperature. This module not only effectively improves the efficiency of waste heat recovery, but also monitors the heat loss of waste heat recovery in real time, reduces energy waste, and ensures the stability and economy of system operation.

[0073] Furthermore, the emission monitoring module constructs a steam-water-pollution emission function according to the steam-water mixed steam data, the first continuous water discharge data and the historical pollution emission data at a historical time; corresponding Figure 1 The S5 step includes:

[0074] Obtain the steam-water mixed steam data at historical time, including historical mixed steam temperature and historical mixed steam pressure; obtain the chemical concentration of the first discharge water data at historical time, including historical carbon content concentration, historical sulfur content concentration, historical nitrogen content concentration and historical suspended solids concentration; obtain the corresponding historical pollution emission data, including carbon dioxide emissions, nitrogen oxide emissions, sulfur dioxide emissions and dust emissions;

[0075] The steam-water-pollution discharge function is constructed according to the steam-water mixed steam data at the historical time, the chemical concentration of the first continuous water discharge data and the historical pollution emission data. The specific formula is:

[0076] ;

[0077] in, Indicates The historical pollution emissions of each pollutant component and , corresponding to carbon dioxide emissions, nitrogen oxide emissions, sulfur dioxide emissions and dust emissions respectively; Indicates the mixed steam temperature at the corresponding historical time point; Indicates the mixed steam pressure at the corresponding historical time point; Indicates the corresponding historical time point The chemical concentration of the first connected drainage data of the chemical composition, They correspond to the historical carbon content concentration, historical sulfur content concentration, historical nitrogen content concentration and historical suspended matter concentration respectively; Indicates The constant coefficient of each pollution component; , and Indicates Proportional coefficient of each pollution component; , , and It is obtained by fitting the data of the steam-water mixture at historical time, the chemical concentration of the first discharge water data and the historical pollution emission data.

[0078] The embodiment of the present application exemplarily lists the carbon emission data at different time points, as shown in Table 1. Among them, the unit of historical mixed steam temperature is ° C, the unit of historical mixed steam pressure is MPa, the unit of historical carbon content concentration is mg / L, and the unit of carbon dioxide emission is g / h.

[0079] Table 1. Some examples of carbon emission data at different time points

[0080]

[0081] Through the steam-water-pollution emission function, the influence of the chemical composition of continuous drainage and mixed steam data on pollution emissions can be described, thereby effectively improving the accuracy and efficiency of continuous drainage management. It can not only evaluate the pollutant concentration of continuous drainage in real time, but also provide a basis for optimizing emission control measures.

[0082] Furthermore, corresponding Figure 1 In step S6, the continuous drainage comprehensive analysis module obtains the inlet steam temperature, the steam-water mixing heat loss, the waste heat recovery heat loss and the steam-water-pollution displacement function through the pipeline data monitoring module, the continuous drainage waste heat recovery monitoring module and the emission monitoring module respectively; determines the heat recovery loss by combining the steam-water mixing heat loss and the waste heat recovery heat loss; calculates the inlet steam cost through the inlet steam temperature; and constructs the continuous drainage comprehensive optimization function by combining the heat recovery loss, the inlet steam cost and the steam-water-pollution displacement function;

[0083] The formula of the combined drainage optimization function is expressed as:

[0084] ;

[0085] in, Represents the comprehensive optimization function of the continuous drainage Find the minimum value; Indicates inlet steam data, including inlet steam temperature, inlet steam pressure and inlet steam flow rate; represents the heat recovery cost; represents the heat loss of the soda-water mixture; represents the waste heat recovery heat loss; denotes said imported steam cost; Indicates the historical pollution emission data The soda-water-pollution emission function of the emission components; Indicates The cost of treating each emission component; The number of types of emission components; , and represents an optimization weight coefficient, which is used to measure the influence factor of the heat recovery loss, the imported steam cost and the steam-water-pollution displacement function on the combined drainage comprehensive optimization function; , and The mean value interval of Inside, and .

[0086] By introducing the integrated optimization function of continuous drainage, the continuous drainage system can be accurately managed and optimized, significantly improving the system's heat recovery efficiency and economy. The optimization function comprehensively considers multiple factors, including steam-water mixing heat loss, waste heat recovery heat loss, imported steam cost, and pollution emissions, and adjusts the impact of each factor on the overall benefits of the system through weight coefficients, so that heat recovery loss is effectively controlled and steam cost is optimized, thereby reducing energy consumption and operating costs and improving energy utilization efficiency.

[0087] Furthermore, the inlet steam cost is calculated by the inlet steam temperature, and the specific calculation formula is:

[0088] ;

[0089] in, denotes said imported steam cost; Indicates the inlet steam quality, obtained by the inlet steam pressure and the inlet steam flow rate, in kg; It represents the specific enthalpy of inlet steam; represents the specific heat capacity of steam; Indicates the inlet steam temperature and the saturated steam temperature at the inlet steam pressure The temperature difference between Indicates the energy density of the fuel in kJ / kg; It represents the heat conversion efficiency; Indicates the gas cost.

[0090] By calculating the cost of imported steam, the economic feasibility of imported steam can be effectively evaluated, providing a decision-making basis for optimizing energy use. In the process of continuous drainage management, combined with the cost calculation of imported steam, energy consumption and costs can be further reduced. By reasonably adjusting the steam temperature and pressure, unnecessary energy losses can be effectively reduced and heat conversion efficiency can be improved.

[0091] Furthermore, the combined flow and drainage analysis module is optimized by a simulated annealing algorithm to obtain the optimal inlet steam data; Figure 3 , which is a flow chart of solving the combined optimization function of continuous drainage by using the simulated annealing algorithm; the specific process includes:

[0092] S601. Initialize an initial solution , i.e. the initial inlet steam data, and setting a predetermined temperature reduction coefficient and a maximum number of iterations;

[0093] S602. Based on the current solution Generate a neighborhood solution ; Calculate the current solution With neighborhood solution The value of the combined optimization function of drainage;

[0094] S603. Determine whether to solve the neighborhood by using the Metropolis criterion Update to new current solution , if updated, then reducing the temperature parameter in the current solution according to the predetermined temperature reduction coefficient;

[0095] S604. Determine whether the termination condition is met. If the termination condition is met, return the current solution as the optimal inlet steam data; if the termination condition is not met, return to step S602 and continue to the next round of iteration.

[0096] Optionally, the optimization is terminated with a termination condition of The current solution is not updated or the maximum number of iterations is reached.

[0097] The embodiment of the present application optimizes the imported steam data by using a simulated annealing algorithm, which can gradually approach the optimal solution in multiple iterations, thereby achieving precise control of the imported steam. This process effectively reduces the conflict between steam flow and drainage efficiency, and improves the system's operational stability and resource utilization.

[0098] Embodiment 2

[0099] The present application embodiment applies a combined drainage management system proposed by the present invention to Figure 4 The waste heat recovery industrial process of continuous drainage is shown in the figure to achieve comprehensive management of the continuous drainage of a power plant boiler.

[0100] Specifically, see Figure 4 An industrial flow chart for waste heat recovery of continuous drainage provided in an embodiment of the present application. Among them, the solid line is a continuous drainage circulation pipeline, including a first wastewater pipeline, a second wastewater pipeline and a third wastewater pipeline; the dotted line is a steam circulation pipeline, including a first steam pipeline and a second steam pipeline. On different continuous drainage circulation pipelines, the boiler 1 is connected to the expansion tank electric valve 3 and the continuous pipeline electric valve 4, and the expander electric valve 3 is connected to the continuous expansion tank 2; the expander electric valve 3 is used to control the continuous drainage output of the boiler 1 to input the continuous expansion tank 2; the continuous expansion tank 2 is used to reduce the pressure of the high-pressure continuous drainage. On different steam circulation pipelines, the steam output electric valve 6 and the steam input electric valve 8 are connected to both sides of the boiler continuous waste heat recovery device 7; the steam pipeline electric valve 5 is directly connected to the steam inlet and the steam outlet, and is used to adjust the temperature of the output steam; the boiler continuous waste heat recovery device 7 is used to heat exchange the steam input from the steam input electric valve 8, and output it from the steam output electric valve 6.

[0101] In an embodiment of the present application, the wastewater data acquisition module monitors and collects the first drainage data, the second drainage data, the steam-water mixed steam data, the pollution emission data and the steam output temperature of the boiler 1 on different drainage circulation pipes in real time through sensors; wherein, the first drainage data represents the relevant data of the wastewater output of the boiler 1; the second drainage data represents the relevant data of the wastewater output of the pipeline electric valve 4; the steam-water mixed steam data represents the relevant data of the steam input electric valve 8 output steam; the historical pollution emission data represents the relevant data of the pollutants emitted by the boiler chain waste heat recovery device 7.

[0102] Furthermore, the pipeline data monitoring module obtains the corresponding first drainage pressure according to the first drainage data of the wastewater output by the boiler 1 on different drainage circulation pipes; if the first drainage pressure is greater than or equal to the predetermined pressure threshold, the expansion tank electric valve 3 is opened and the row pipe electric valve 4 is closed, and the wastewater of the boiler 1 is input into the row expansion tank 2 for pressure reduction treatment to obtain the decompressed wastewater; at the same time, the row pipe electric valve 4 is opened to output the decompressed wastewater; according to the second drainage data on all drainage circulation pipes, the corresponding second drainage temperature and second drainage pressure are obtained; the second drainage temperature difference and the second drainage pressure difference between different drainage circulation pipes are calculated; if the second drainage temperature difference is less than the predetermined temperature difference threshold and the second drainage pressure difference is less than the predetermined pressure difference threshold, the wastewater of the corresponding pipeline is divided into a group for mixing treatment; the inlet steam temperature at the steam inlet is determined by combining the steam-water mixing heat balance equation and the second drainage data of the same group of wastewater; the steam-water mixing heat loss is calculated by the steam-water mixing steam data and the ideal parameters of the mixed steam.

[0103] Specifically, mixing the wastewater from different drainage pipes means mixing the wastewater from multiple pipes with similar temperatures with the steam input from the steam inlet to obtain mixed steam, and then exchanging heat through the same boiler drainage waste heat recovery device 7 to improve the efficiency of the integrated drainage management. For example, the drainage of several medium-temperature and medium-pressure boilers is converted to heat by the same waste heat recovery device, while the drainage of medium-temperature and medium-pressure boilers and high-temperature and high-pressure boilers are converted to heat by different waste heat recovery devices.

[0104] Furthermore, the waste heat recovery monitoring module combines the heat conservation equation and the steam-water mixed steam data to determine the ideal steam output temperature; and calculates the waste heat recovery heat loss based on the steam output temperature and the ideal steam output temperature.

[0105] Optionally, when the steam output temperature is lower than the steam temperature to be transmitted to downstream users, the steam pipeline electric valve 5 can be opened to mix the steam output by the steam output electric valve 6 with the steam input by the steam inlet to increase the steam temperature to reach the steam temperature required by downstream users.

[0106] Furthermore, the emission monitoring module constructs a steam-water-pollution emission function based on the steam-water mixed steam data, the first continuous drainage data and the historical pollution emission data at historical times; the continuous drainage comprehensive analysis module integrates the pipeline data monitoring module, the continuous drainage waste heat recovery monitoring module and the emission monitoring module to construct a continuous drainage comprehensive optimization function, and optimizes it through a simulated annealing algorithm to obtain the optimal imported steam data.

[0107] The embodiment of the present application exemplarily lists the temperature and pressure of the second drainage data, steam-water mixed steam data and output steam data corresponding to different boilers in the integrated drainage management process, as shown in Table 2. The unit of temperature is °C; the unit of pressure is MPa.

[0108] Table 2. Some examples of wastewater and steam related parameters for different boilers

[0109]

[0110] According to the data in Table 2, it can be seen that the temperature and pressure of the second drainage data of GL01 and GL03 are similar, and the same waste heat recovery device is used for heat energy conversion; while the temperature and pressure of the second drainage data of GL02 and GL04 are relatively high, and the same waste heat recovery device is used for heat energy conversion, which can reduce heat loss and improve the utilization rate of drainage.

[0111] The present invention significantly improves the overall efficiency of drainage management through the synergistic effect of multiple modules. The pipeline data monitoring module optimizes the wastewater treatment efficiency and heat recovery efficiency by accurately monitoring the wastewater treatment and steam recovery process, reduces energy waste and improves thermal efficiency; the drainage waste heat recovery monitoring module optimizes the waste heat recovery process through accurate calculation of the heat conservation equation, reduces heat loss, further improves the thermal efficiency of the system, and effectively reduces energy consumption; the emission monitoring module ensures that emissions meet environmental protection standards, reduces pollutant emissions, and improves the operating efficiency of the system; the drainage comprehensive analysis module uses comprehensive optimization functions and simulated annealing algorithms to optimize imported steam parameters, maximize energy utilization, minimize costs, further reduce heat loss and emissions, and reduce system operating costs and environmental pollution.

[0112] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water drainage integrated management system, characterized in that: include: The wastewater data collection module monitors and collects the first-stage drainage data, second-stage drainage data, steam-water mixed steam data, pollution emission data and steam output temperature of several target boilers in real time through sensors; The pipeline data monitoring module determines whether to perform pressure reduction treatment according to the first drainage data of the output wastewater for different target boilers; calculates the second drainage temperature difference and the second drainage pressure difference through the second drainage data, and performs wastewater grouping and mixing treatment; for the same group of wastewater, determines the inlet steam temperature by combining the second drainage data and the steam-water mixing heat balance equation; calculates the steam-water mixing heat loss through the steam-water mixing steam data and the ideal parameters of the mixed steam; The waste heat recovery monitoring module of the water discharge system determines the ideal steam output temperature by combining the heat conservation equation and the steam-water mixed steam data; and calculates the waste heat recovery heat loss according to the steam output temperature and the ideal steam output temperature; An emission monitoring module, which constructs a steam-water-pollution emission function according to the steam-water mixed steam data, the first continuous water discharge data and the historical pollution emission data at a historical time; The integrated analysis module for continuous and draining water integrates the pipeline data monitoring module, the continuous and draining water waste heat recovery monitoring module and the emission monitoring module to construct a comprehensive optimization function for continuous and draining water, and optimizes it through a simulated annealing algorithm to obtain the best imported steam data.

2. The integrated drainage management system according to claim 1, characterized in that: The first wastewater discharge data represent wastewater data detected at the wastewater discharge outlet of the target boiler; the second wastewater discharge data represent wastewater data detected after the wastewater is depressurized by the wastewater expansion tank.

3. The integrated drainage management system according to claim 1, characterized in that: The process in which the pipeline data monitoring module calculates the second water connection and drainage temperature difference and the second water connection and drainage pressure difference, and performs wastewater grouping and mixed treatment includes: According to the first drainage data of several target boilers, the corresponding first drainage pressure is obtained; if the first drainage pressure is greater than or equal to the predetermined pressure threshold, the wastewater of the target boiler is depressurized and the depressurized wastewater is output; according to the second drainage data of all the target boilers, the corresponding second drainage temperature and second drainage pressure are obtained, and the second drainage temperature difference and the second drainage pressure difference between different target boilers are calculated; if the second drainage temperature difference is less than the predetermined temperature difference threshold and the second drainage pressure difference is less than the predetermined pressure difference threshold, the wastewater in the corresponding pipeline is divided into a group for mixed treatment.

4. The integrated drainage management system according to claim 1, characterized in that: The specific implementation process of the pipeline data monitoring module determining the inlet steam temperature through the steam-water mixing heat balance equation includes: The second drainage flow of the same group of wastewater is obtained, and the inlet steam pressure and the inlet steam flow are set. The inlet steam temperature is calculated by the steam-water mixing heat balance equation in combination with the second drainage temperature and the second drainage pressure. The calculation formula of the steam-water mixing heat balance equation is: ； in, represents the inlet steam flow rate; represents the inlet steam pressure; represents the gas constant of steam; represents the inlet steam temperature; 273.15 represents the value used for temperature unit conversion; represents the specific heat capacity of steam; represents the saturated steam temperature at the inlet steam pressure, obtained from the thermodynamic parameter table of saturated steam; Indicates The second drainage flow rate of the wastewater in the pipeline; Indicates the number of drainage pipes for mixing soda and water; It indicates the density of drainage; Indicates The heat of evaporation required for the wastewater in the first pipe to evaporate at the second drainage pressure; Indicates The specific enthalpy of the wastewater in the first pipe at the second drainage pressure; represents the specific heat capacity of wastewater; Indicates The second discharge temperature of the wastewater in the pipeline; Indicates The saturated water temperature of the wastewater in a pipeline under the second drainage pressure.

5. The integrated drainage management system according to claim 1, characterized in that: The specific implementation process of the pipeline data monitoring module calculating the heat loss of the steam-water mixture includes: According to the steam-water mixed steam data, the mixed steam temperature, mixed steam pressure and mixed steam flow are obtained; through the ideal mixed steam parameters, the ideal mixed steam temperature and the ideal mixed steam pressure are obtained, and the steam-water mixed heat loss is calculated. The specific calculation formula is: ； in, represents the heat loss of the soda-water mixture; represents the mixed steam flow rate; represents the specific enthalpy of saturated steam at the mixed steam pressure; represents the specific enthalpy of saturated steam at the ideal pressure of the mixed steam; represents the specific heat capacity of steam; represents the mixed steam temperature; represents the temperature of saturated steam at the mixed steam pressure; Indicates the ideal temperature of the mixed steam; It represents the temperature of saturated steam at the ideal pressure of the mixed steam.

6. The integrated drainage management system according to claim 1, characterized in that: The waste heat recovery monitoring module for water discharge obtains the mixed steam temperature, mixed steam pressure and mixed steam flow rate according to the steam-water mixed steam data; obtains the desalted water flow rate and initial temperature, and calculates the ideal steam output temperature through the heat conservation equation; and determines the waste heat recovery heat loss in combination with the steam output temperature.

7. The integrated drainage management system according to claim 1, characterized in that: The specific implementation process of the emission monitoring module constructing the steam-water-pollution emission function includes: Acquire the steam-water mixed steam data at historical time, the chemical concentration of the first continuous water discharge data and the corresponding historical pollution emission data; The steam-water-pollution discharge function is constructed according to the steam-water mixed steam data at the historical time, the chemical concentration of the first continuous water discharge data and the historical pollution emission data.

8. The integrated drainage management system according to claim 1, characterized in that: The combined drainage comprehensive analysis module obtains the inlet steam temperature, the steam-water mixing heat loss, the waste heat recovery heat loss and the steam-water-pollution displacement function respectively through the pipeline data monitoring module, the combined drainage waste heat recovery monitoring module and the discharge volume monitoring module; determines the heat recovery loss by combining the steam-water mixing heat loss and the waste heat recovery heat loss; calculates the imported steam cost through the inlet steam temperature; and constructs the combined drainage comprehensive optimization function by combining the heat recovery loss, the imported steam cost and the steam-water-pollution displacement function; The formula of the combined drainage optimization function is expressed as: ； in, Represents the comprehensive optimization function of the continuous drainage Find the minimum value; Indicates inlet steam data, including inlet steam temperature, inlet steam pressure and inlet steam flow rate; represents the heat recovery cost; represents the heat loss of the soda-water mixture; represents the waste heat recovery heat loss; denotes said imported steam cost; Indicates the historical pollution emission data The soda-water-pollution emission function of the emission components; Indicates The cost of treating each emission component; The number of types of emission components; , and represents an optimization weight coefficient, which is used to measure the influence factor of the heat recovery loss, the imported steam cost and the steam-water-pollution displacement function on the combined drainage comprehensive optimization function; , and The mean value interval of Inside, and .

9. The integrated drainage management system according to claim 8, characterized in that: The inlet steam cost is calculated by the inlet steam temperature. The specific calculation formula is: ； in, denotes said imported steam cost; represents the inlet steam quality, which is obtained by the inlet steam pressure and the inlet steam flow rate; It represents the specific enthalpy of inlet steam; represents the specific heat capacity of steam; Indicates the inlet steam temperature and the saturated steam temperature at the inlet steam pressure The temperature difference between Indicates the energy density of the fuel; It represents the heat conversion efficiency; Indicates the gas cost.

10. The integrated drainage management system according to claim 1, characterized in that: The specific implementation process of optimizing by simulated annealing algorithm to obtain the optimal inlet steam data includes: Initialize an initial solution , i.e. the initial inlet steam data, and set a predetermined temperature reduction coefficient and a maximum number of iterations; in each iteration, according to the current solution Generate a neighborhood solution ; Calculate the current solution With neighborhood solution The value of the combined optimization function of drainage and consolidation; judging whether to solve the neighborhood by the Metropolis criterion Update to new current solution If updated, the temperature parameters in the current solution are reduced according to the predetermined temperature reduction coefficient; whether the termination condition is met is determined, and if the termination condition is met, the current solution is returned as the optimal inlet steam data; if the termination condition is not met, the next round of iteration is continued.

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