Method and system for calculating failure proportion and time of boiler make-up water mixed bed

Abstract

The invention discloses a boiler make-up water mixed bed failure proportion and time calculation method and system, and the method comprises the steps: collecting the operation parameters of a mixed bed, and calculating the mixed bed cation resin failure proportion and the mixed bed anion resin failure proportion according to the operation parameters of the mixed bed; determining the residual water production amount of the mixed bed according to the operation parameters of the mixed bed; and calculating the time from the mixed bed to the next regeneration according to the residual water production amount of the mixed bed. The method and the system can accurately calculate the failure ratio of the anion resin and the cation resin in the mixed bed and the time from the next regeneration.

Description

Technical Field

[0001] The invention belongs to the technical field of mixed bed monitoring, and relates to a method and system for calculating the failure ratio and time of a boiler feed water mixed bed. Background Art

[0002] A mixed bed is a mixed ion exchange column that removes ions and other impurities from water at a certain flow rate through alternating arrangements of anion exchange resins and cation exchange resins, thereby producing high-purity water. When the exchange capacity of the cation exchange resin or anion exchange resin reaches a certain level, it needs to be regenerated. In actual operation, to ensure the quality of the effluent, water production is generally terminated before the resin fails. Acid and alkali regeneration is performed to restore the water production capacity by statistically analyzing the water production volume. However, due to variations in the incoming water quality, the amount of ions entering the mixed bed is not uniform. This may cause the resin to fail before the expected water production volume is reached, resulting in substandard desalinated water quality. Alternatively, a large amount of resin may be regenerated prematurely before failure, leading to waste of regenerated acid and alkali. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method and system for calculating the failure ratio and time of a boiler feed water mixed bed. The method and system accurately calculate the failure ratio of the cation and cation resins in the mixed bed and the time to the next regeneration.

[0004] To achieve the above object, the present invention discloses a method for calculating the failure ratio and time of a boiler feed water mixed bed, comprising:

[0005] Collect the operating parameters of the mixed bed, including the instantaneous flow rate of water into the mixed bed q (m 3 / h), instantaneous conductivity of influent D1 (μS / cm), instantaneous conductivity of mixed bed effluent D2 (μS / cm), mixed bed cation exchange capacity E1 (mol / m 3 ), cationic resin volume V1 (m 3 ), mixed bed anion resin exchange capacity E2 (mol / m 3 ), anion resin volume V2 (m 3 ), power generation per unit time (ZMW·h) and external heat supply R (m 3 / h);

[0006] Calculate the failure ratio of the mixed bed cation resin and the failure ratio of the mixed bed anion resin according to the operating parameters of the mixed bed;

[0007] Determine the remaining water production of the mixed bed based on the operating parameters of the mixed bed;

[0008] Calculate the time until the next regeneration of the mixed bed based on the remaining water production of the mixed bed.

[0009] The further improvement of the method for calculating the failure ratio and time of the boiler feed water mixed bed of the present invention is:

[0010] Furthermore, the failure ratio η1 of the mixed bed cation resin and the failure ratio η2 of the mixed bed anion resin are:

[0011] η1=m1 / (E1×V1) (18)

[0012] η2=m2 / (E2×V2) (19)

[0013] Among them, E1 is the exchange capacity of mixed bed cation resin, V1 is the volume of mixed bed cation resin, E2 is the exchange capacity of mixed bed anion resin, V2 is the volume of anion resin, m1 is the Na exchanged by mixed bed cation resin + Molar weight, m2 is the Cl exchanged by the mixed bed anion resin - Molar amount.

[0014] Furthermore, the mixed bed cation resin has exchanged Na + Molar amount m1 and mixed bed anion resin have exchanged Cl - The molar amounts m2 are:

[0015] m1=Σ(a1-b1) / n (8)

[0016] m2=Σ(a2-b2) / n (9)

[0017] Among them, n is the flow rate and conductivity data corresponding to the number of data recorded each hour, a1 is the mixed bed inlet water Na + Molar flow rate, a2 is the mixed bed inlet water Cl - Molar flow rate, b1 is the mixed bed outlet water Na + Molar flow rate, b2 is the mixed bed effluent Cl - Molar flow rate.

[0018] Furthermore, the mixed bed inlet water Na + Molar flow rate a1, mixed bed inlet water Cl - Molar flow rate a2, mixed bed outlet water Na + Molar flow rate b1 and mixed bed outlet water Cl - The molar flow rates b2 are:

[0019] a1=q×C1×23 / 58.5=0.393×C1×q (4)

[0020] a2=q×C1×35.5 / 58.5=0.607×C1×q (5)

[0021] b1=q×C2×23 / 58.5=0.393×C2×q (6)

[0022] b2=q×C2×35.5 / 58.5=0.607×C2×q (7)

[0023] Among them, q is the instantaneous flow rate of mixed bed inlet water, C1 is the instantaneous sodium chloride concentration of mixed bed inlet water, and C2 is the instantaneous sodium chloride concentration of mixed bed outlet water.

[0024] Furthermore, the instantaneous sodium chloride concentration C1 of the mixed bed inlet water and the instantaneous sodium chloride concentration C2 of the mixed bed outlet water are respectively:

[0025] C1=a×D1+b (2)

[0026] C2=a×D2+b (3)

[0027] Where D1 is the instantaneous conductivity of the mixed bed inlet water, D2 is the instantaneous conductivity of the mixed bed outlet water, and a and b are the fitting coefficients.

[0028] Furthermore, the time t from the mixed bed to the next regeneration is:

[0029] t=Q / Y (23)

[0030] Among them, Y is the desalted water replenishment of the unit per hour, and Q is the residual water production of the mixed bed.

[0031] Furthermore, the remaining water production Q of the mixed bed is:

[0032] Q = min(Q1, Q2) (22)

[0033] Among them, Q1 is the remaining water production of the mixed bed cation resin, and Q2 is the remaining water production of the mixed bed anion resin.

[0034] Furthermore, the remaining water production of the mixed bed cation resin Q1 and the remaining water production of the mixed bed anion resin Q2 are respectively:

[0035] Q1=(E1×V1-m1) / (x1-y1) (20)

[0036] Q2=(E2×V2-m2) / (x2-y2) (21)

[0037] Among them, E1 is the exchange capacity of mixed bed cation resin, V1 is the volume of mixed bed cation resin, E2 is the exchange capacity of mixed bed anion resin, V2 is the volume of anion resin, m1 is the Na exchanged by mixed bed cation resin + Molar weight, m2 is the Cl exchanged by the mixed bed anion resin - Molar weight, x1 is the mixed bed inlet water Na + Average molar concentration, x2 is the Cl in the mixed bed inlet - Average molar concentration, y1 is the Na of mixed bed effluent + Average molar concentration, y2 is the Cl of mixed bed effluent -Average molar concentration.

[0038] Furthermore, the unit's hourly desalted water replenishment amount Y is:

[0039] Y=c×Z+d+R (24)

[0040] Where Z is the power generation per hour, R is the external heat supply per hour, and c and d are the fitting coefficients.

[0041] The present invention discloses a boiler feed water mixed bed failure ratio and time calculation system, comprising:

[0042] Acquisition module, used to collect operating parameters of the mixed bed;

[0043] The first calculation module is used to calculate the failure rate of the mixed bed cation resin and the failure rate of the mixed bed anion resin according to the operating parameters of the mixed bed;

[0044] A determination module, used to determine the remaining water production of the mixed bed according to the operating parameters of the mixed bed;

[0045] The second calculation module is used to calculate the time until the next regeneration of the mixed bed according to the remaining water production of the mixed bed.

[0046] The present invention has the following beneficial effects:

[0047] During specific operation, the method and system for calculating the failure ratio and time of a mixed bed for boiler feed water described in the present invention collect operating parameters of the mixed bed to calculate the failure ratio of the cation resin and the failure ratio of the anion resin in the mixed bed, as well as the time until the next regeneration of the mixed bed, so that operating personnel can understand the operating status of the mixed bed and predict the regeneration time, thereby ensuring the quality of desalted water while maximizing the water production capacity of the mixed bed and planning the regeneration work in advance. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0049] Figure 1 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0050] 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 them. 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.

[0051] In the description of the present invention, it is to be understood that the terms “include” and “comprise” indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0052] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0053] It should be further understood that the term "and / or" as used in the present specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0054] It should be understood that although the terms "first," "second," and "third" may be used to describe preset ranges in embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are merely used to distinguish one preset range from another. For example, without departing from the scope of embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0055] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0057] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0058] Example 1

[0059] refer to Figure 1 The method for calculating the failure ratio and time of a boiler feed water mixed bed according to the present invention comprises the following steps:

[0060] 1) Collecting the operating parameters of the mixed bed, including the instantaneous flow rate of water into the mixed bed q (m 3 / h), instantaneous conductivity of influent D1 (μS / cm), instantaneous conductivity of mixed bed effluent D2 (μS / cm), mixed bed cation exchange capacity E1 (mol / m 3 ), cationic resin volume V1 (m 3 ), mixed bed anion resin exchange capacity E2 (mol / m 3 ), anion resin volume V2 (m 3 ), power generation per unit time (ZMW·h) and external heat supply R (m 3 / h);

[0061] Since the mixed bed inlet water is treated by reverse osmosis or "cation bed-anion bed", the main ions of the mixed bed inlet and outlet water are Na + and Cl - , the relationship between NaCl molar concentration C and conductivity D is established as:

[0062] C=a×D+b (1)

[0063] Wherein, C is the molar concentration of NaCl in water, mmol / L; D is the conductivity of water, μS / cm; a and b are the coefficients obtained by fitting.

[0064] Calculate the mixed bed inlet water sodium chloride concentration and outlet water sodium chloride concentration according to the mixed bed inlet water instantaneous conductivity and outlet water instantaneous conductivity:

[0065] C1=a×D1+b (2)

[0066] C2=a×D2+b (3)

[0067] Wherein, C1 is the instantaneous sodium chloride concentration of the mixed bed inlet water, mmol / L; C2 is the instantaneous sodium chloride concentration of the mixed bed effluent water, mmol / L; D1 is the instantaneous conductivity of the mixed bed inlet water, μS / cm; D2 is the instantaneous conductivity of the mixed bed effluent water, μS / cm.

[0068] Calculate the Na in the mixed bed inlet and outlet water + 、Cl - Molar flow rate:

[0069] a1=q×C1×23 / 58.5=0.393×C1×q (4)

[0070] a2=q×C1×35.5 / 58.5=0.607×C1×q (5)

[0071] b1=q×C2×23 / 58.5=0.393×C2×q (6)

[0072] b2=q×C2×35.5 / 58.5=0.607×C2×q (7)

[0073] Among them, q is the instantaneous flow rate of mixed bed water, m 3 / h; a1 is the mixed bed inlet water Na + Molar flow rate, mmol / h; a2 is the Cl in the mixed bed inlet - Molar flow rate, mmol / h; b1 is the mixed bed effluent Na + Molar flow rate, mmol / h; b2 is the Cl content of the mixed bed effluent - Molar flow rate, mmol / h.

[0074] Calculate the exchanged Na of mixed bed cation resin + Molar amount, anion resin has exchanged Cl - Molar weight:

[0075] m1=Σ(a1-b1) / n (8)

[0076] m2=Σ(a2-b2) / n (9)

[0077] Among them, m1 is the mixed bed cation resin that has exchanged Na + Molar weight, mmol; m2 is the Cl exchanged by the mixed bed anion resin - Molar weight, mmol; n is the number of data recorded every hour corresponding to the flow rate and conductivity data.

[0078] 2) Calculate the average conductivity of the mixed bed inlet water and the average conductivity of the outlet water, that is:

[0079] d1=average(D1) (10)

[0080] d2=average(D2) (11)

[0081] Wherein, d1 is the average conductivity of the mixed bed inlet water, μS / cm; d2 is the average conductivity of the mixed bed outlet water, μS / cm.

[0082] Calculate the average concentration of sodium chloride in the mixed bed inlet and outlet:

[0083] c1=a×d1+b (12)

[0084] c2=a×d2+b (13)

[0085] Wherein, c1 is the average concentration of sodium chloride in the mixed bed inlet water, mmol / L; c2 is the average concentration of sodium chloride in the mixed bed outlet water, mmol / L.

[0086] Calculate the mixed bed influent Na + 、Cl - Average molar concentration and Na of mixed bed effluent + 、Cl - The average molar concentration is:

[0087] x1=c1×23 / 58.5=0.393×c1 (14)

[0088] x2=c1×35.5 / 58.5=0.607×c1 (15)

[0089] y1=c2×23 / 58.5=0.393×c2 (16)

[0090] y2=c2×35.5 / 58.5=0.607×c2 (17)

[0091] Among them, x1 is the mixed bed inlet water Na + Average molar concentration, mmol / L; x2 is the Cl in the mixed bed inlet - Average molar concentration, mmol / L; y1 is the Na + Average molar concentration, mmol / L; y2 is the Cl content of the mixed bed effluent -Average molar concentration, mmol / L.

[0092] 3) Calculate the failure ratio of mixed bed cation and anion resins:

[0093] η1=m1 / (E1×V1) (18)

[0094] η2=m2 / (E2×V2) (19)

[0095] Wherein, η1 is the failure ratio of mixed bed cation resin; η2 is the failure ratio of mixed bed anion resin; E1 is the exchange capacity of mixed bed cation resin, mol / m 3 ; V1 is the volume of mixed bed cationic resin, m 3 ; E2 is the exchange capacity of the mixed bed anion resin, mol / m 3 ; V2 is the volume of anion resin, m 3 .

[0096] Calculate the remaining water production of the mixed bed anion resin and the remaining water production of the anion resin:

[0097] Q1=(E1×V1-m1) / (x1-y1) (20)

[0098] Q2=(E2×V2-m2) / (x2-y2) (21)

[0099] Q = min(Q1, Q2) (22)

[0100] Among them, Q1 is the residual water production of the mixed bed cation resin, m 3 ; Q2 is the residual water production of the mixed bed anion resin, m 3 ; Q is the residual water production of the mixed bed, m 3 .

[0101] 4) Calculate the time until the next regeneration:

[0102] t=Q / Y (23)

[0103] Among them, t is the time from the mixed bed to the next regeneration, h; Y is the amount of desalted water added to the unit per hour, m 3 / h.

[0104] Y=c×Z+d+R (24)

[0105] Among them, Z is the power generation per hour, MW·h; R is the external heat supply per hour, m 3 / h; c and d are the coefficients obtained by fitting. The amount of desalted water required for a fixed unit power generation is constant.

[0106] Example 2

[0107] The boiler feed water mixed bed failure ratio and time calculation system of the present invention comprises:

[0108] Acquisition module, used to collect operating parameters of the mixed bed;

[0109] The first calculation module is used to calculate the failure rate of the mixed bed cation resin and the failure rate of the mixed bed anion resin according to the operating parameters of the mixed bed;

[0110] A determination module, used to determine the remaining water production of the mixed bed according to the operating parameters of the mixed bed;

[0111] The second calculation module is used to calculate the time until the next regeneration of the mixed bed according to the remaining water production of the mixed bed.

[0112] The division of modules in the embodiments of the present application is illustrative and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the present application may be integrated into a single processor, or may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0113] Example 3

[0114] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for calculating the failure rate and time of a boiler feed water mixed bed are implemented, for example, including: collecting operating parameters of the mixed bed; calculating the failure rate of the cation resin and the failure rate of the anion resin in the mixed bed based on the operating parameters of the mixed bed; determining the remaining water production capacity of the mixed bed based on the operating parameters of the mixed bed; and calculating the time until the next regeneration of the mixed bed based on the remaining water production capacity of the mixed bed. The memory may include internal memory, such as a high-speed random access memory (RAM), or may also include non-volatile memory, such as at least one disk drive. The processor, network interface, and memory are interconnected via an internal bus, which may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (ESIA) bus, and may be classified as an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the programs may include program code, which includes computer operating instructions. The memory may include both internal memory and non-volatile memory, and provides instructions and data to the processor.

[0115] Example 4

[0116] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for calculating the failure ratio and time of a mixed bed of boiler feed water, for example, including: collecting operating parameters of the mixed bed; calculating the failure ratio of the cation resin in the mixed bed and the failure ratio of the anion resin in the mixed bed based on the operating parameters of the mixed bed; determining the remaining water production of the mixed bed based on the operating parameters of the mixed bed; and calculating the time until the next regeneration of the mixed bed based on the remaining water production of the mixed bed. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0117] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0118] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0121] Those skilled in the art will readily identify other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0122] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0123] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for calculating the failure ratio and time of a boiler feed water mixed bed, characterized in that: include: Collect operating parameters of the mixed bed; Calculate the failure ratio of the mixed bed cation resin and the failure ratio of the mixed bed anion resin according to the operating parameters of the mixed bed; Determine the remaining water production of the mixed bed based on the operating parameters of the mixed bed; Calculate the time until the next regeneration of the mixed bed based on the remaining water production of the mixed bed.

2. The method for calculating failure ratio and time of a boiler feed water mixed bed according to claim 1, characterized in that: The failure ratios of mixed bed cation resin η1 and mixed bed anion resin η2 are: η1=m1 / (E1×V1) (18) η2=m2 / (E2×V2) (19) Among them, E1 is the exchange capacity of mixed bed cation resin, V1 is the volume of mixed bed cation resin, E2 is the exchange capacity of mixed bed anion resin, V2 is the volume of anion resin, m1 is the Na exchanged by mixed bed cation resin + Molar weight, m2 is the Cl exchanged by the mixed bed anion resin - Molar amount.

3. The method for calculating failure ratio and time of a boiler feed water mixed bed according to claim 2, characterized in that: Mixed bed cation resin has exchanged Na + Molar amount m1 and mixed bed anion resin have exchanged Cl - The molar amounts m2 are: m1=Σ(a1-b1) / n (8) m2=Σ(a2-b2) / n (9) Among them, n is the flow rate and conductivity data corresponding to the number of data recorded each hour, a1 is the mixed bed inlet water Na + Molar flow rate, a2 is the mixed bed inlet water Cl - Molar flow rate, b1 is the mixed bed outlet water Na + Molar flow rate, b2 is the mixed bed effluent Cl - Molar flow rate.

4. The method for calculating failure ratio and time of a boiler feed water mixed bed according to claim 3, characterized in that: Mixed bed inlet water Na + Molar flow rate a1, mixed bed inlet water Cl - Molar flow rate a2, mixed bed outlet water Na + Molar flow b1 and mixed bed outlet water Cl - The molar flow rates b2 are: a1=q×C1×23 / 58.5=0.393×C1×q (4) a2=q×C1×35.5 / 58.5=0.607×C1×q (5) b1=q×C2×23 / 58.5=0.393×C2×q (6) b2=q×C2×35.5 / 58.5=0.607×C2×q (7) Among them, q is the instantaneous flow rate of mixed bed inlet water, C1 is the instantaneous sodium chloride concentration of mixed bed inlet water, and C2 is the instantaneous sodium chloride concentration of mixed bed outlet water.

5. The method for calculating failure ratio and time of a boiler feed water mixed bed according to claim 4, characterized in that: The instantaneous sodium chloride concentration C1 of the mixed bed inlet water and the instantaneous sodium chloride concentration C2 of the mixed bed outlet water are: C1=a×D1+b (2) C2=a×D2+b (3) Where D1 is the instantaneous conductivity of the mixed bed inlet water, D2 is the instantaneous conductivity of the mixed bed outlet water, and a and b are the fitting coefficients.

6. The method for calculating failure ratio and time of a boiler feed water mixed bed according to claim 1, characterized in that: The time t from the mixed bed to the next regeneration is: t=Q / Y (23) Among them, Y is the desalted water replenishment of the unit per hour, and Q is the residual water production of the mixed bed.

7. The method for calculating failure ratio and time of a boiler feed water mixed bed according to claim 6, characterized in that: The remaining water production Q of the mixed bed is: Q = min(Q1, Q2) (22) Among them, Q1 is the remaining water production of the mixed bed cation resin, and Q2 is the remaining water production of the mixed bed anion resin.

8. The method for calculating failure ratio and time of a boiler feed water mixed bed according to claim 7, characterized in that: The remaining water production of the mixed bed cation resin Q1 and the remaining water production of the mixed bed anion resin Q2 are: Q1=(E1×V1-m1) / (x1-y1) (20) Q2=(E2×V2-m2) / (x2-y2) (21) Among them, E1 is the exchange capacity of mixed bed cation resin, V1 is the volume of mixed bed cation resin, E2 is the exchange capacity of mixed bed anion resin, V2 is the volume of anion resin, m1 is the Na exchanged by mixed bed cation resin + Molar weight, m2 is the Cl exchanged by the mixed bed anion resin - Molar weight, x1 is the mixed bed inlet water Na + Average molar concentration, x2 is the Cl in the mixed bed inlet - Average molar concentration, y1 is the Na of mixed bed effluent + Average molar concentration, y2 is the Cl of mixed bed effluent - Average molar concentration.

9. The method for calculating failure ratio and time of a boiler feed water mixed bed according to claim 6, characterized in that: The unit's hourly desalted water supply Y is: Y=c×Z+d+R (24) Where Z is the power generation per hour, R is the external heat supply per hour, and c and d are the fitting coefficients.

10. A boiler feed water mixed bed failure ratio and time calculation system, characterized in that: include: Acquisition module, used to collect operating parameters of the mixed bed; The first calculation module is used to calculate the failure rate of the mixed bed cation resin and the failure rate of the mixed bed anion resin according to the operating parameters of the mixed bed; A determination module, used to determine the remaining water production of the mixed bed according to the operating parameters of the mixed bed; The second calculation module is used to calculate the time until the next regeneration of the mixed bed according to the remaining water production of the mixed bed.

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