Circulating water balance control method of closed circulating cooling water tower

Abstract

The invention relates to the field of circulating water balance treatment control methods, and particularly discloses a circulating water balance control method of a closed circulating cooling water tower, which comprises the following steps of: 1, acquiring an average concentration multiple of a circulating water system in a unified period, and judging the size of the average concentration multiple to determine a dynamic adjustment strategy; 2, different control conditions are selected and triggered according to the dynamic adjustment strategy, and the planned water supplementing amount is determined according to the triggered control conditions; the control conditions comprise a first control condition and a second control condition; 3, determining the water quality water supplementing amount according to the planned water supplementing amount and a water quality balance equation; 4, analyzing the substance concentration in the circulating water according to the water quality and the water supplementing amount, and determining to execute water supplementing or trigger forced pollution discharge; according to the invention, the problems of leakage and water quality pollution discharge of circulating water in the closed circulating cooling water tower are coordinated, so that the water balance control and adjustment method is optimized.

Description

Technical Field

[0001] The invention relates to the field of circulating water balance processing control methods, and in particular to a circulating water balance control method for a closed-loop cooling water tower. Background Art

[0002] The closed-loop cooling water tower adopts the closed-loop water system to realize the method of circulating water balance control; and in the closed loop of the closed-loop water system, in order to ensure the water flow balance, the main considerations are the leakage and water quality problems in the closed system, and the control process of sealing maintenance and water quality balance is realized.

[0003] Patent publication number CN113408831B discloses a water balance control method and device for an open-circuit circulating water system. This method calculates the average concentration multiple over a specified period of time using the accumulated amount of evaporated water and the accumulated amount of replenished water. This is then compared with a pre-set long-term concentration multiple, and the total replenishment volume is controlled based on the comparison result. Furthermore, based on the circulating water quality limits and water balance for single- and dual-quality replenishment, a recommended replenishment volume is calculated to guide replenishment control of the water system. This ensures that the water system remains within its limits, maximizing its capabilities.

[0004] The above solution still has several problems: First, it is not suitable for the circulation system of a closed-loop cooling water tower, and the closed system needs to accurately compensate for water losses such as pipe leakage and valve leakage; second, it does not take into account water quality pollution problems such as scaling and corrosion caused by concentration of circulating water in the closed system, resulting in the destruction of the water balance cycle of the closed system. Summary of the Invention

[0005] The purpose of the present invention is to provide a circulating water balance control method for a closed-loop cooling water tower to solve the following technical problems:

[0006] How to solve the problems of leakage and water quality discharge in closed-loop cooling water towers and optimize the water balance control and adjustment methods.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] The circulating water balance control method of the closed-loop cooling water tower includes:

[0009] Step 1: Obtain the average concentration multiple of the circulating water system within one cycle, determine the average concentration multiple and determine the dynamic adjustment strategy;

[0010] Step 2: Select triggering different control conditions according to the dynamic adjustment strategy, and determine the planned water replenishment amount according to the triggered control conditions; the control conditions include the first control condition and the second control condition;

[0011] Step 3: Determine the water quality replenishment amount based on the planned water replenishment amount and the water quality balance equation;

[0012] Step 4: Analyze the concentration of substances in the circulating water based on the water quality and replenishment volume to determine whether to perform replenishment or trigger forced sewage discharge.

[0013] Preferably, the dynamic adjustment strategy selection triggers different control conditions including:

[0014] When the average concentration multiple N A Not less than the long-term concentration target value N a When the current average concentration factor N is maintained A As the first target concentration multiple N1;

[0015] Trigger the first control condition: obtain the first planned water replenishment amount Q according to the first target concentration multiple N1 j1 ;

[0016] When the average concentration multiple N A Less than the long-term concentration target value N a When , the second target concentration multiple N2 is calculated:

[0017] By the formula N2=N A +(N a -N A )×r is used to calculate the second target concentration multiple N2; where r is the adjustment coefficient; N A is the average concentration multiple; N a is the long-term concentration multiple target value;

[0018] Trigger the second control condition: Calculate the second planned water replenishment amount Q based on the second target concentration multiple N2 j2 .

[0019] Preferably, the first planned water replenishment amount Q j1 The calculation process is:

[0020] Maintain the planned water replenishment frequency and single water replenishment volume in the next cycle, and maintain the planned sewage discharge frequency and single sewage discharge volume in the next cycle; assuming that the planned water replenishment frequency and planned sewage discharge frequency are the same, and sewage discharge is carried out simultaneously with each water replenishment, the duration of a single water replenishment and a single sewage discharge is different;

[0021] Count the total water replenishment Q for the next cycle B and the total sewage volume Q P , the calculation formula is: Q j1 =(|Q B -Q P |)×N1.

[0022] Preferably, the second planned water replenishment amount Q j2 The calculation process is:

[0023] Assuming that the planned water replenishment frequency is the same as the planned sewage discharge frequency, and sewage discharge is carried out simultaneously with each water replenishment, the duration of a single water replenishment and a single sewage discharge is different;

[0024] According to the next cycle, the difference between the water replenishment control state value during the water replenishment duration and the sewage discharge control state value during the sewage discharge duration is determined at the second target concentration N2:

[0025]

[0026] Among them, V sta is the control state difference coefficient; [0, t a ] is the period in the water replenishment control state, t a is the end time of water replenishment control; [0, t b ] is the period in the pollution control state, t b The end time of pollution discharge control; is the average water replenishment amount during the water replenishment control stage; is the average sewage discharge volume in the sewage control stage; Q T is the total water volume inside the closed-loop cooling tower; e is the base of the natural constant;

[0027] Determine the control state difference coefficient V sta Whether the fixed value is met:

[0028] If yes, confirm The second planned water supply Q j2 :

[0029] If not, adjust the water replenishment frequency and sewage discharge frequency, and continue to obtain the control state difference coefficient V sta , until the control state difference coefficient V sta Satisfy the fixed value.

[0030] Preferably, step three includes:

[0031] Through the water balance equation: Q B ×C B =Q P ×C P Among them, Q B is the total water replenishment, C B is the concentration of the substance in the replenishing water; Q P is the total sewage discharge volume; C P is the concentration of the substance in the circulating water;

[0032] By deformation formula: Q B =Q P +Qlk , Q B =Q P ×N;

[0033] Furthermore, Q P ×N=Q P +Q lk ;Q P (N-1)=Q lk ;Q lk is the system leakage;

[0034] Furthermore, the total water supply Q B :

[0035] Substance concentration C in circulating water P :C P =N×C B ;

[0036] Water quality and water replenishment quantity Q MR :

[0037] When the first planned water replenishment amount Q j1 :Q MR =Q j1 ×C P ;

[0038] When the second planned water replenishment amount Q j2 :Q MR =Q j2 ×C P .

[0039] Preferably, step four includes:

[0040] The concentration of the substance in the circulating water C P and safety threshold C limit Compare and judge C P Is it less than or equal to C? limit :

[0041] If so, water replenishment is performed based on the water quality and amount;

[0042] If not, water replenishment is stopped and forced sewage discharge is triggered.

[0043] Preferably, the conditions for triggering forced sewage discharge are:

[0044] When C P Greater than C limit When the water concentration exceeds the standard, the water supply is stopped and the actual concentration multiple N is determined. i Is there any loss of control?

[0045] When the actual concentration multiple N iExceeding the long-term concentration target value N a 120% of the total, triggering mandatory sewage discharge;

[0046] When the actual concentration multiple N i Lower than the long-term concentration target value N a If the water level reaches 80%, the sewage discharge will be stopped.

[0047] Preferably, step 4 further includes performing pressure fluctuation detection to determine the sealing performance of the closed-loop cooling water tower:

[0048] Obtain the system pressure drop value ΔP based on the system leakage:

[0049]

[0050] Where ΔP is the system pressure drop value; V is the system volume; t is the monitoring time; P a is atmospheric pressure.

[0051] Preferably, it is determined whether the system pressure drop value ΔP is greater than a threshold value:

[0052] If so, the planned water replenishment amount is obtained according to the target concentration multiple;

[0053] If not, periodic pressure disturbances are applied and recorded by a high-frequency pressure sensor to determine whether there is a leak. If so, a leak warning signal is generated.

[0054] Preferably, when forced sewage discharge is triggered more than twice in a cycle, the water source structure is adjusted and softened water is added. The specific method is as follows:

[0055] After confirming that the sewage is discharged, add an equal amount of softened water;

[0056] And restore the dynamic adjustment strategy to obtain the planned water replenishment amount.

[0057] The beneficial effects of the present invention are as follows: the present invention sets up a circulating water balance control method through a closed system in a closed-loop cooling water tower, which can realize dynamic adjustment and control of circulating water, and ensure that the planned water replenishment amount information can be accurately obtained according to different control conditions through the dynamic adjustment strategy; and the water quality replenishment amount is determined according to the planned water replenishment amount and the water quality balance equation, and the safety critical value is determined, and the sealing inspection is carried out according to the safety critical value, so that the circulating water leakage problem can be discovered and early-warningly handled in time, and the water replenishment adjustment is triggered according to the leakage amount and the forced sewage treatment is triggered according to the water quality, and then the coordinated water replenishment is carried out, so as to realize the optimization of the water balance control and adjustment process.

[0058] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0060] Figure 1 This is a step diagram of the circulating water balance control method of the closed-loop cooling water tower of the present invention. DETAILED DESCRIPTION

[0061] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0062] See also Figure 1 As shown, the present invention is a circulating water balance control method for a closed-loop cooling water tower, the method comprising:

[0063] Step 1: Obtain the average concentration multiple of the circulating water system within one cycle, determine the average concentration multiple and determine the dynamic adjustment strategy;

[0064] Step 2: Select triggering different control conditions according to the dynamic adjustment strategy, and determine the planned water replenishment amount according to the triggered control conditions; the control conditions include the first control condition and the second control condition;

[0065] Step 3: Determine the water quality replenishment amount based on the planned water replenishment amount and the water quality balance equation;

[0066] Step 4: Analyze the concentration of substances in the circulating water based on the water quality and replenishment volume to determine whether to perform replenishment or trigger forced sewage discharge.

[0067] In the above technical solution, a circulating water balance control method is set up through a closed system in a closed-loop cooling water tower, which can realize dynamic adjustment and control of the circulating water, and ensure that the planned water replenishment amount information can be accurately obtained according to different control conditions by starting the dynamic adjustment strategy; and the water quality replenishment amount is determined according to the planned water replenishment amount and the water quality balance equation, and the safety critical value is determined, and the sealing inspection is carried out according to the safety critical value, so as to realize timely discovery and early warning of circulating water leakage problems, and coordinate water replenishment after triggering water replenishment adjustment according to the leakage amount and triggering forced sewage treatment according to the water quality, so as to realize the optimization of the water balance control and adjustment process.

[0068] The above effects are mainly achieved through the following steps:

[0069] Step 1: Obtain the average concentration multiple within a cycle of the circulating water system, determine the average concentration multiple and determine the dynamic adjustment strategy; the cycle can be considered as a week, a month or other time intervals, and set according to actual needs;

[0070] Specifically, the average concentration factor N A The calculation method is:

[0071]

[0072] Among them, Q Bi is the total water replenishment during the cycle; Q lki The accumulated leakage volume of the cycle; and the leakage volume is collected in real time by the flow meter, and the accumulated leakage volume is determined by recording the real-time leakage volume of each cycle.

[0073] Since evaporation loss is not considered in a closed system, the main losses are leakage and water quality imbalance (high water quality concentration) in the sewage discharge process, which affects the overall water balance control process. Therefore, it is considered to set up a dynamic adjustment strategy to adjust the leakage problem by compensating for water replenishment. The parameter for water replenishment determination is the planned water replenishment amount, and the control setting is carried out by triggering control conditions, which include the first control condition and the second control condition. Specifically, in step two, different control conditions are triggered according to the dynamic adjustment strategy in step one, and the planned water replenishment amount is determined according to the triggered control conditions. It is ensured that the water quality is further determined based on the obtained planned water replenishment amount to ensure the determination of subsequent sewage discharge control conditions.

[0074] As an embodiment of the present invention, the dynamic adjustment strategy includes:

[0075] The dynamic adjustment strategy is divided into two control conditions, and the planned water replenishment obtained is also different, namely the first planned water replenishment and the second planned water replenishment;

[0076] First, when the average concentration multiple N A Not less than the long-term concentration target value N a When the current average concentration factor N is maintained A As the first target concentration multiple N1, trigger the first control condition; here, analyze when the average concentration multiple N A When it is maintained at a higher level, it proves that the current water replenishment can adjust the leakage change. The current average concentration multiple N A That is, the control condition for maintaining the current normal water balance state, and then determining the process of continuing to replenish water;

[0077] Among them, the first control condition is:

[0078] Obtain the first planned water replenishment amount Q according to the first target concentration multiple N1j1 :

[0079] Maintain the planned water replenishment frequency and single water replenishment volume in the next cycle, maintain the planned sewage discharge frequency and single sewage discharge volume in the next cycle; in the closed system, a control process that can coordinate water replenishment and sewage discharge needs to be set up. This control process is usually pre-set, and the premise of the setting is: assuming that the planned water replenishment frequency and the planned sewage discharge frequency are the same, and each water replenishment operation is performed simultaneously with the sewage discharge operation, the duration of single water replenishment and single sewage discharge can be different (adjusted according to the planned water replenishment volume according to the size of the water replenishment port and the valve opening setting; adjusted according to the sewage discharge volume under the equilibrium state according to the size of the sewage discharge port and the valve setting); such condition settings ensure that the data of the water replenishment process and the sewage discharge process can be obtained synchronously, and can accurately ensure that the first planned water replenishment volume is not affected by the changes in the target concentration multiples caused by asynchronous water replenishment and sewage discharge, so as to further determine the circulating water quality balance condition control.

[0080] Specifically, the total water replenishment amount Q of the next cycle is calculated B and the total sewage volume Q P , and its calculation formula is:

[0081] Q j1 =(|Q B -Q P |)×N1

[0082] Among them, Q j1 is the first planned water replenishment amount; N1 is the first target concentration multiple; Q B The total water replenishment amount Q for the next cycle B , and the next cycle has the same length as the previous cycle; Q P is the total sewage discharge volume.

[0083] Second, when the average concentration multiple N A Less than the long-term concentration target value N a When the second target concentration multiple N2 is calculated: Here, the average concentration multiple N is analyzed. A The smaller the value, the more likely it is that the water replenishment amount is too low or the leakage is abnormal. Therefore, it is necessary to further calculate the second target concentration multiple value. The specific calculation formula is:

[0084] By the formula N2=N a +(N a -N A )×r is calculated to obtain the second target concentration multiple N2; when the long-term concentration multiple target value N a Greater than the existing average concentration factor N AWhen the difference between the two is taken as the gap value, the leakage loss or additional water replenishment can be compensated by multiplying it by the adjustment coefficient. Finally, the second target concentration multiple N2 obtained by the above formula is determined after compensation; where r is the adjustment coefficient, and the value of r is 0.05 or 0.1; N A is the average concentration multiple; N a is the long-term concentration multiple target value; the advantage of this calculation is that due to N a This is an artificially set value, which may not be achieved by the actual closed system. Under this setting, when the closed system can reach the limit of the actual target value, it needs to be able to maintain it within this range (in fact, it cannot reach the limit), thereby ensuring that the balance function of the water cycle is maximized;

[0085] Then, the second control condition is triggered; the water replenishment process is realized by triggering the second control condition; specifically, the second control condition is: the second planned water replenishment amount Q is calculated according to the second target concentration multiple N2 j2 , to optimize the water replenishment control process, and optimize the existing problem of being unable to determine whether there is abnormal leakage in the closed system or whether water replenishment is needed based on the average concentration multiple.

[0086] Specifically, as an embodiment of the present invention, the second planned water replenishment amount Q j2 The calculation process is:

[0087] Assuming that the planned water replenishment frequency is the same as the planned sewage discharge frequency, and sewage discharge is carried out simultaneously with each water replenishment, the duration of a single water replenishment and a single sewage discharge is different;

[0088] According to the next cycle, under the second target concentration N2, the difference between the water replenishment control state value during the water replenishment duration and the sewage discharge control state value during the sewage discharge duration is obtained, and the calculation formula is as follows:

[0089]

[0090] Among them, V sta is the control state difference coefficient; [0, t a ] is the period in the water replenishment control state, t a is the end time of water replenishment control; [0, t b ] is the period in the pollution control state, t b The end time of pollution discharge control; is the average water replenishment amount during the water replenishment control stage; is the average sewage discharge volume in the sewage control stage; Q Tis the total water volume inside the closed-loop cooling water tower; e is the base of a natural constant; the control state difference coefficient is obtained by analyzing the difference between the water replenishment control state value during the water replenishment duration and the sewage discharge control state value during the sewage discharge duration; the integral term quantifies the cumulative dilution effect during the water replenishment period and the cumulative concentration effect during the sewage discharge period; the difference between the two integral terms reflects the synergistic effect of water replenishment and sewage discharge, and thus reflects the net concentration change trend of the system;

[0091] The base term of the natural constant e t It reflects the time rate of change of the dilution or concentration effect of the instantaneous flow of water replenishment and sewage discharge on the system concentration. It is mainly because when the concentration of water replenishment is low or the concentration of sewage discharge is high, the system concentration will change rapidly, and as the mixing time goes by, the rate of change will gradually slow down and approach a steady state. Sewage discharge ratio are used as the weight values of water replenishment and sewage discharge respectively. In the integral term, it represents the influence ratio of the average water replenishment and average sewage discharge on the water mixing efficiency in the whole system. The greater the proportion of water replenishment, the greater the influence of the water replenishment integral term. Conversely, the greater the proportion of sewage discharge, the greater the influence of the sewage discharge integral term.

[0092] Furthermore, by judging the control state difference coefficient V sta Whether it satisfies the fixed value: If so, obtain The water supply volume Q for the second plan j2 : If not, adjust the water replenishment frequency and sewage discharge frequency, and continue to obtain the control state difference coefficient V sta , until the control state difference coefficient V sta Satisfy the fixed value; specifically, determine the impact of the difference in integral terms on the net concentration trend of the system. If the difference in integral terms is the formula If the water dilution effect is greater than the fixed value, it is judged that the water dilution effect is dominant, the system concentration gradually decreases and water needs to be replenished in time to determine the second planned water replenishment amount; on the contrary, the sewage concentration effect is dominant and the system concentration tends to increase, then it is necessary to further adjust the relationship between the water replenishment frequency and the sewage discharge comment and control it until the control state difference coefficient V sta Once the fixed value is met, confirm the second planned water replenishment amount.

[0093] Step 3: Determine the water quality replenishment amount based on the planned water replenishment amount and the water quality balance equation; achieve accurate confirmation of the water quality replenishment amount.

[0094] As an embodiment of the present invention, step three specifically includes:

[0095] Through the water balance equation: Q B ×C B =Q P ×CP Among them, Q B is the total water replenishment, C B is the concentration of the substance in the replenishing water; Q P is the total sewage discharge volume; C P is the concentration of substances in the circulating water; here, it means that the total amount of substances brought in by the replenishment water is equal to the total amount of substances brought out by the sewage discharge. In order to solve the concentration of substances in the circulating water, C P , and continued with the following reasoning:

[0096] By deformation formula: Q B =Q P +Q lk , Q B =Q P ×N; the total water replenishment volume is equal to the total sewage discharge volume; and N refers to the concentration multiple; the total water replenishment volume is also equal to the product of the total sewage discharge volume and the concentration multiple; according to the modified formula, the total sewage discharge volume Q P Can be converted to: Q P ×N=Q P +Q lk ;Q P (N-1)=Q lk Among them, Q lk is the system leakage; By correlating the total sewage volume, system leakage volume and concentration multiples, and calculating the total water replenishment volume Q in combination with the system leakage volume, B : Further, according to the water quality balance equation, after incorporating the system leakage into the total sewage discharge, the concentration multiple was obtained. Correlation, solve the circulating water substance concentration C P :C P =N×C B ; Further, calculate the water quality replenishment amount Q MR :When the first planned water replenishment amount Q j1 When the water quality replenishment amount Q MR =Q j1 ×C P ; When the second planned water replenishment amount Q j2 When the water quality replenishment amount Q MR =Q j2 ×C P .

[0097] Step 4: Analyze the concentration of substances in the circulating water based on the water quality and replenishment volume to determine whether to perform replenishment or trigger forced sewage discharge.

[0098] As an embodiment of the present invention, step four includes:

[0099] Judgment C PIs it less than or equal to the safety critical value C? limit :

[0100] If so, water replenishment is performed based on the water quality and amount;

[0101] If not, water replenishment is stopped and forced sewage discharge is triggered.

[0102] In the above technical solution, in step 4, the water replenishment amount C P Make further judgment, when C P ≤C limit When the water quality concentration is normal, that is, the mineral and chloride ion content in the water is normal, water replenishment continues; otherwise, it is judged that the mineral and chloride ion content in the water exceeds the standard, and water replenishment needs to be stopped and forced sewage discharge is triggered; by comparing the water replenishment amount with the critical value, it is used as a control condition for triggering forced sewage discharge, thereby ensuring the coordination of the current water replenishment process and sewage discharge process. The safety critical value C in the system limit It is a pre-set reference value for the standard water quality concentration of the closed-circulation cooling water tower, which is generally the same as the long-term concentration multiple target value N. a For example, setting N a When the concentration of the substance in the replenishing water is C B The product of 5 is 5C B C is the safety critical value limit .

[0103] As an embodiment of the present invention, the conditions for triggering forced sewage discharge are:

[0104] When C P >C limit When the water concentration exceeds the standard, the water supply is stopped and the actual concentration multiple N is determined. i Is there any loss of control?

[0105] When the actual concentration multiple N i Exceeding the long-term concentration target value N a 120% of the total, triggering mandatory sewage discharge;

[0106] When the actual concentration multiple N i Lower than the long-term concentration target value N a 80% of the sewage was stopped.

[0107] In the above technical solution, the specific process for triggering forced sewage discharge is: if the current safety critical value is exceeded, water replenishment is stopped, and the actual concentration multiple N needs to be determined. i Whether it is out of control, according to the actual concentration multiple N i The size determines the conditions for triggering the start and end of forced sewage discharge. The condition for triggering the start of forced sewage discharge is the actual concentration multiple N iExceeding the long-term concentration target value N a 120% of the actual concentration, the condition for stopping sewage discharge is multiple N i Lower than the long-term concentration target value N a and the current triggering compulsory sewage discharge volume is the sewage discharge volume for implementing the planned sewage discharge.

[0108] As an embodiment of the present invention, step 4 further includes performing pressure fluctuation detection to determine the sealing performance of the closed-loop cooling water tower; and obtaining a system pressure drop value ΔP based on the system leakage:

[0109]

[0110] Where ΔP is the system pressure drop value; V is the system volume; t is the monitoring time; P a is atmospheric pressure;

[0111] Determine whether the system pressure drop value ΔP is greater than the threshold:

[0112] If so, the planned water replenishment amount is obtained according to the target concentration multiple;

[0113] If not, periodic pressure disturbances are applied and recorded by a high-frequency pressure sensor to determine whether there is a leak. If so, a leak warning signal is generated.

[0114] In the above technical solution, the degree of leakage is determined by judging the sealing of the closed-loop cooling water tower through pressure fluctuation detection. Under normal conditions, the planned water replenishment volume is obtained according to the target concentration multiple, that is, the first planned water replenishment volume or the second planned water replenishment volume is determined; and in the case where the leakage cannot be coordinated by water replenishment, it is further determined whether additional detection is required based on the size of the system pressure drop value to prevent the risk of a large degree of leakage. The prevention method is to apply periodic pressure disturbances, record them through high-frequency pressure sensors, and determine whether there is a leakage. If so, a leakage warning signal is generated.

[0115] As an embodiment of the present invention, when forced sewage discharge is triggered more than twice in a cycle, the water source structure is adjusted and softened water is added. The specific method is as follows:

[0116] After confirming that the sewage is discharged, add an equal amount of softened water;

[0117] And restore the dynamic adjustment strategy to obtain the planned water replenishment amount.

[0118] In the above technical solution, a method for adjusting the water source structure is also set up to ensure that the accumulation of various types of impurities in the circulating water, which causes changes in water quality, requires timely updating and adjustment of the water source structure. The specific method is: when the forced sewage discharge is triggered more than twice in a cycle, softened water is added; after confirming the execution of sewage discharge, an equal amount of softened water is added; and the dynamic adjustment strategy is restored to obtain the planned water replenishment amount and determine the updated planned water replenishment frequency.

[0119] The various embodiments in this specification are described in a progressive manner. Similar portions between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the device, apparatus, and non-volatile computer storage medium embodiments are generally similar to the method embodiments, so their descriptions are relatively simplified. For relevant details, refer to the descriptions of the method embodiments.

[0120] The foregoing description is of specific embodiments of this specification. Other embodiments are within the scope of the accompanying documents. In some cases, the actions or steps described in this application can be performed in an order different from that shown in the embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0121] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined in this application, they should all fall within the scope of protection of the present invention.

Claims

1. A circulating water balance control method for a closed-loop cooling water tower, comprising a circulating water system, characterized in that: The method comprises: Step 1: Obtain the average concentration multiple of the circulating water system within one cycle, determine the average concentration multiple and determine the dynamic adjustment strategy; Step 2: selecting and triggering different control conditions according to the dynamic adjustment strategy, and determining the planned water replenishment amount according to the triggered control conditions; the control conditions include a first control condition and a second control condition; Step 3: Determine the water quality replenishment amount based on the planned water replenishment amount and the water quality balance equation; Step 4: Analyze the concentration of substances in the circulating water based on the water quality and replenishment volume to determine whether to perform replenishment or trigger forced sewage discharge.

2. The circulating water balance control method of a closed-loop cooling water tower according to claim 1, characterized in that: The dynamic adjustment strategy selection triggers different control conditions including: When the average concentration multiple N A Not less than the long-term concentration target value N a When the current average concentration factor N is maintained A As the first target concentration multiple N1; Trigger the first control condition: obtain the first planned water replenishment amount Q according to the first target concentration multiple N1 j1 ; When the average concentration multiple N A Less than the long-term concentration target value N a When , the second target concentration multiple N2 is calculated: By the formula N2=N A +(N a -N a )×r is used to calculate the second target concentration multiple N2; where r is the adjustment coefficient; N A is the average concentration multiple; N a is the long-term concentration multiple target value; Trigger the second control condition: Calculate the second planned water replenishment amount Q based on the second target concentration multiple N2 j2 .

3. The circulating water balance control method of a closed-loop cooling water tower according to claim 2, characterized in that: The first planned water replenishment amount Q j1 The calculation process is: Maintain the planned water replenishment frequency and single water replenishment volume in the next cycle, and maintain the planned sewage discharge frequency and single sewage discharge volume in the next cycle; assuming that the planned water replenishment frequency and planned sewage discharge frequency are the same, and sewage discharge is carried out simultaneously with each water replenishment, the duration of a single water replenishment and a single sewage discharge is different; Count the total water replenishment Q for the next cycle B and the total sewage volume Q P , the calculation formula is: Q j1 =(|Q B -Q P |)×N1.

4. The circulating water balance control method of a closed-loop cooling water tower according to claim 2, characterized in that: The second planned water replenishment amount Q j2 The calculation process is: Assuming that the planned water replenishment frequency is the same as the planned sewage discharge frequency, and sewage discharge is carried out simultaneously with each water replenishment, the duration of a single water replenishment and a single sewage discharge is different; According to the next cycle, the difference between the water replenishment control state value during the water replenishment duration and the sewage discharge control state value during the sewage discharge duration is determined at the second target concentration N2: Among them, V sta is the control state difference coefficient; [0, t a ] is the period in the water replenishment control state, t a is the end time of water replenishment control; [0, t b ] is the period in the pollution control state, t b The end time of pollution discharge control; is the average water replenishment amount during the water replenishment control stage; is the average sewage discharge volume in the sewage control stage; Q T is the total water volume inside the closed-loop cooling tower; e is the base of the natural constant; Determine the control state difference coefficient V sta Whether the fixed value is met: If yes, confirm The second planned water supply Q j2 : If not, adjust the water replenishment frequency and sewage discharge frequency, and continue to obtain the control state difference coefficient V sta , until the control state difference coefficient V sta Satisfy the fixed value.

5. The circulating water balance control method of a closed-loop cooling water tower according to claim 4, characterized in that: In step 3, the water quality replenishment amount is determined according to the planned water replenishment amount and the water quality balance equation, specifically: Through the water balance equation: Q B ×C B =Q P ×C P Among them, Q B is the total water replenishment, C B is the concentration of the substance in the replenishing water; Q P is the total sewage discharge volume; C P is the concentration of the substance in the circulating water; By deformation formula: Q B =Q P +Q lk , Q B =Q P ×N; Furthermore, Q P ×N=Q P +Q lk ;Q P (N-1)=Q lk ;Q lk is the system leakage; Furthermore, the total water supply Q B : Substance concentration C in circulating water P :C P =N×C B ; Water quality and water replenishment quantity Q MR : When the first planned water replenishment amount Q j1 :Q MR =Q j1 ×C P ; When the second planned water replenishment amount Q j2 :Q MR =Q j2 ×C P .

6. The circulating water balance control method of a closed-loop cooling water tower according to claim 5, characterized in that: The fourth step includes: The concentration of the substance in the circulating water C P and safety threshold C limit Compare and judge C P Is it less than or equal to C? limit : If so, water replenishment is performed based on the water quality and amount; If not, water replenishment is stopped and forced sewage discharge is triggered.

7. The circulating water balance control method of a closed-loop cooling water tower according to claim 6, characterized in that: The conditions for triggering mandatory sewage discharge are: When C P Greater than C limit When the water concentration exceeds the standard, the water supply is stopped and the actual concentration multiple N is determined. i Is there any loss of control? When the actual concentration multiple N i Exceeding the long-term concentration target value N a 120% of the total, triggering mandatory sewage discharge; When the actual concentration multiple N i Lower than the long-term concentration target value N a 80% of the sewage was stopped.

8. The circulating water balance control method for a closed-loop cooling water tower according to claim 6, characterized in that: The fourth step also includes performing pressure fluctuation detection to determine the sealing performance of the closed-loop cooling water tower: Obtain the system pressure drop value ΔP based on the system leakage: Where ΔP is the system pressure drop value; V is the system volume; t is the monitoring time; P a is atmospheric pressure.

9. The circulating water balance control method of a closed-loop cooling water tower according to claim 8, characterized in that: Determine whether the system pressure drop value ΔP is greater than the threshold: If so, the planned water replenishment amount is obtained according to the target concentration multiple; If not, periodic pressure disturbances are applied, recorded by a high-frequency pressure sensor, and a judgment is made as to whether there is a leak. If so, a leak warning signal is generated.

10. The circulating water balance control method of a closed-loop cooling water tower according to claim 1, characterized in that: When forced sewage discharge is triggered more than twice in a cycle, the water source structure is adjusted and softened water is added. The specific method is as follows: After confirming that the sewage is discharged, add an equal amount of softened water; And restore the dynamic adjustment strategy to obtain the planned water replenishment amount.

Images