JP5940724B1 - Maintenance planning method for plant equipment - Google Patents

Abstract

A plant maintenance planning method for rationally determining a combination of maintenance menus in consideration of a result of evaluating profits obtained from plant operation based on an expected plant operation rate. A maintenance planning method for selecting a maintenance menu candidate mk from a plurality (K) of maintenance menu candidates mk (1 ≦ k ≦ K) of a plant facility 1, wherein each of the plurality of maintenance menu candidates mk is selected. In the operation rate change index calculation step for calculating the operation rate change index ΔAk of the plant equipment 1 when the maintenance menu candidate mk is executed, and when each maintenance menu candidate mk is executed based on the operation rate change index ΔAk Based on the first profit change calculation step for calculating the first profit change Pck obtained by the operation of the plant facility 1 and the first profit change Pck calculated for each maintenance menu candidate mk, the maintenance menu candidate mk A maintenance menu selection step of selecting a combination. [Selection] Figure 3

Description

  The present disclosure relates to a technique for maintaining plant equipment having a long operation period until cancellation, and more specifically, to a method for formulating a maintenance plan for the plant equipment.

  In recent years, with the sale of various plants, which are large-scale products with a long retirement age, long-term maintenance contracts (LTSA) and specific plant maintenance plans for the plant after sale are sold by the vendor (plant manufacturer) and customers (plants). There are an increasing number of cases of negotiations with other customers. In the plant maintenance plan, a major goal is to ensure that the actual operating rate of the plant does not fall below the target operating rate.

  In formulating a plant maintenance plan, it is important to achieve the target operating rate. On the other hand, the long-term maintenance service fee for the plant accounts for a large percentage of the maintenance cost of the components that make up the plant. There is also a problem. Therefore, in the planning of the plant maintenance plan, not only the target operating rate of the plant is achieved, but also the viewpoint of cost effectiveness and the profit improvement effect obtained by the plant maintenance becomes important. In other words, when considering a plant maintenance plan, in order to create a combination of maintenance menus that is beneficial to both the customer and the seller, a combination of maintenance menus that improve customer profits and prevent profits from being made to the seller It is necessary to make a reasonable decision.

  Patent Documents 1 to 3 allow a maintenance plan covering the entire depreciation period of a plant to be planned for each of a plurality of periods (each month, each year, etc.) until the plant is canceled from a quantitative viewpoint. The method for determining the optimum maintenance plan is disclosed. The method described in Patent Document 1 determines the equipment to be inspected and repaired and the cost required for each period based on the damage probability of each constituent equipment. In addition, the method described in Patent Document 1 selects a maintenance plan that minimizes the maintenance cost and the damage cost caused by the plant shutdown as an optimal candidate. On the other hand, the method described in Patent Document 2 converts a maintenance cost generated in each period into a present value for each of a plurality of maintenance plan candidates, and then selects a maintenance plan that maximizes the NPV (net present value) as an optimal candidate. Select as The optimum maintenance plan determination method described in Patent Document 3 is based on a maintenance plan candidate that is expected to be able to minimize the maintenance cost without falling below the target plant utilization rate among a plurality of maintenance plan candidates for each period. Select.

JP 2003-099119 A JP 2003-330532 A JP 2013-061819 A

  In the optimum maintenance plan determination methods described in Patent Documents 1 to 3, a maintenance plan is generated that suppresses maintenance costs and damage costs caused by plant shutdown as much as possible, or considers the achievement of the target operating rate as a constraint to be satisfied. However, in the optimum maintenance plan determination methods described in Patent Documents 1 to 3, the profit obtained from the operation of the plant is evaluated based on the expected plant operation rate, and the maintenance plan is appropriately determined in consideration of the evaluation result of the profit. Cannot be selected. Therefore, the optimum maintenance plan determination methods described in Patent Documents 1 to 3 rationally determine the combination of maintenance menus in consideration of the result of evaluating the profits obtained from the plant operation based on the expected plant operation rate. It does not disclose or suggest the mechanism.

  In view of the above problems, at least one embodiment according to the present invention provides a plant maintenance planning method that rationally determines a combination of maintenance menus in consideration of a result of evaluating profits expected to be obtained by plant operation. The purpose is to obtain.

  (1) In some embodiments according to the present invention, a maintenance planning method for selecting a maintenance menu from a plurality of maintenance menu candidates for plant equipment, the maintenance menu candidates for each of the plurality of maintenance menu candidates. An operation rate change index calculation step for calculating an operation rate change index indicating a change in the operation rate of the plant equipment depending on the presence or absence of implementation, and based on the presence or absence of implementation of each of the maintenance menu candidates based on the operation rate change index, A combination of the maintenance menu candidates is selected based on a first profit change calculating step for calculating a change in the first profit obtained by operating the plant equipment and the first profit calculated for each of the maintenance menu candidates. And a maintenance menu selection step.

  Thus, in the plant facility maintenance planning method according to the embodiment of the present invention, in the method (1), the operation rate change index of the plant facility is obtained according to whether or not a plurality of maintenance menu candidates are implemented, and the operation is performed. A combination of maintenance menu candidates is selected based on the change in the first profit calculated based on the rate change index. Therefore, in the above method (1), not only the maintenance cost and the damage cost caused by the plant stoppage are suppressed, but also the result of evaluating the profit obtained from the operation of the plant based on the expected improvement of the plant operation rate. The maintenance menu combination can be reasonably determined in consideration. As a result, in the method (1), it is possible to rationally determine a combination of maintenance menus that is expected to sufficiently improve the profit obtained from the expected improvement in the plant operation rate.

  (2) In some embodiments according to the present invention, in the maintenance menu selection step included in the method of (1), among the combinations of the maintenance menus satisfying at least one constraint condition to be satisfied by the plant equipment. The combination of the maintenance menu candidates is selected based on the change in the first profit.

  As a result, in the method (2), the maintenance menu candidates that can be implemented using a desired constraint condition are narrowed down, and then the combination of the maintenance menu candidates is selected based on the change in the first profit. it can. On the other hand, in the method (2) above, one or more combinations of the maintenance menu candidates are selected based on the change in the first profit, and the maintenance satisfying a desired constraint condition is selected from the selected combinations. Only menu combinations can be narrowed down as possible combinations. Therefore, in the method (2), when performing a plant maintenance plan, two requirements that are in a trade-off relationship between improvement in profits obtained from plant operation and satisfaction of desired constraints to be satisfied by the plant are compatible. A combination of maintenance menus can be selected.

  (3) In some embodiments according to the present invention, the at least one constraint condition in (2) is that the preventive maintenance cost necessary for implementing the combination of maintenance menu candidates is within the operation budget of the plant equipment. It includes at least one of a condition that it falls within, or a condition that the expected operating rate of the plant facility when the combination of maintenance menu candidates is implemented is equal to or higher than a target operating rate.

  As a result, in the method (3), the maintenance that satisfies the condition that the preventive maintenance cost necessary for the long-term maintenance of the plant is within the predetermined budget or the condition that the actual operating rate of the plant during the maintenance period does not fall below the target operating rate. From the menu combinations, it is possible to appropriately select a combination of maintenance menus in consideration of the result of evaluating the profits obtained from the plant operation based on the expected plant operation rate. On the other hand, in the method (3) above, among maintenance menu combinations selected in consideration of the results of evaluating the profits obtained from plant operations based on the expected plant availability, it is necessary for long-term plant maintenance. It is possible to appropriately select a maintenance menu combination that satisfies the condition that the preventive maintenance cost falls within a predetermined budget or the condition that the actual operation rate of the plant during the maintenance period does not fall below the target operation rate. Therefore, in the method of (3) above, when performing a plant maintenance plan, there is a trade-off between satisfying constraints including achievement of the target operating rate and budget restrictions required for preventive maintenance, and improvement of profits obtained from plant operation. A combination of maintenance menus can be selected in such a way that two related requirements are compatible.

  (4) In some embodiments according to the present invention, in the maintenance menu selection step included in the methods (1) to (3), all of the one or more maintenance menu candidates that increase the first profit are selected. If only the selected one or more maintenance menu candidates do not satisfy at least one constraint condition that the plant equipment should satisfy, the remaining maintenance menu candidates are satisfied so that the at least one constraint condition is satisfied. Add at least one of

  In the method (4), the first maintenance (revenue expected to be obtained by plant operation) is maximized by selecting all maintenance menu candidates that increase the first earnings, and the selected maintenance menu is selected. In the candidate group, the remaining maintenance menu candidates for reducing the first profit are additionally selected only when the above constraint conditions cannot be satisfied. That is, in the method (4), it is possible to rationally determine a maintenance menu combination that makes the first profit as large as possible within a range in which a desired constraint condition can be satisfied. As a result, in the method (4), when performing a plant maintenance plan, the two requirements that are in a trade-off relationship between the improvement of profits obtained from the plant operation and the satisfaction of the desired constraints to be satisfied by the plant are compatible. A combination of maintenance menus can be selected.

  (5) In some embodiments according to the present invention, in the maintenance menu selection step included in the method of (4), the at least one restriction condition is satisfied only by the selected one or more maintenance menu candidates. Otherwise, until the at least one constraint is satisfied, the remaining maintenance menu candidates are added in order from the candidate with the smallest amount of decrease in the first revenue.

  In the method (5), the customer revenue is maximized by selecting all the maintenance menu candidates that increase the first revenue, and only when the selected maintenance menu candidate group does not satisfy the above constraint condition, The maintenance menu candidates with the smallest margins of decrease in profit are additionally selected in order. That is, in the method (5), it is possible to rationally determine a maintenance menu combination that theoretically maximizes the first profit within a range in which a desired constraint condition can be satisfied. As a result, in the method of (5) above, when performing a plant maintenance plan, the two requirements that are in a trade-off relationship between the improvement of the profits obtained from the plant operation and the satisfaction of the desired constraints to be satisfied by the plant are compatible. A combination of maintenance menus can be selected.

  (6) In some embodiments according to the present invention, in the maintenance menu selection step included in the methods (1) to (4) above, a maintenance menu set candidate including a combination of two or more maintenance menu candidates, It is determined whether the preventive maintenance cost necessary for the execution of the maintenance menu set candidate is within the operation budget of the plant equipment. If the preventive maintenance cost exceeds the operation budget, the preventive maintenance cost is It is characterized in that at least one maintenance menu candidate is removed from the maintenance menu set candidates so as to fit within.

  In the method of (6) above, the first profit (expected to be obtained by plant operation) is within the range that the preventive maintenance cost required when the maintenance menu is combined can be included in the operation budget of the plant equipment. The combination of maintenance menus that make the revenue as large as possible can be reasonably determined. In other words, in the above method (6), even when there is an upper limit on the budget for the customer to pay the maintenance service fee when the plant long-term maintenance contract (LTSA) is concluded, the first profit can be as much as the budget allows. A combination of maintenance menus to be enlarged can be rationally determined. As a result, in the method of (6) above, when performing a plant maintenance plan, the two requirements that are in a trade-off relationship between the limitation of the budget required for preventive maintenance and the improvement of profits obtained from plant operation are compatible. A combination of maintenance menus can be selected.

  (7) In some embodiments according to the present invention, in the maintenance menu selection step included in the method of (6), the maintenance menu set candidate is a maintenance menu set candidate composed of a combination of two or more maintenance menu candidates. It is determined whether or not the preventive maintenance cost necessary for the implementation of the candidate is within the operation budget of the plant equipment, and when the preventive maintenance cost exceeds the operation budget, the preventive maintenance cost is within the operation budget. The maintenance menu candidates are removed from the maintenance menu set candidates in order from the maintenance menu candidates having a low cost-effectiveness.

  In the method (7) above, the first profit is taken into consideration while considering the cost-effectiveness of each maintenance menu within a range in which the preventive maintenance costs necessary for the combination of maintenance menus can be kept within the predetermined operation budget. It is possible to determine a combination of maintenance menus that makes the maximum possible. In other words, in the method (7) above, even if there is an upper limit to the budget for paying the maintenance service fee, as long as the budget allows, the first profit can be made as much as possible without implementing a maintenance menu with low cost effectiveness as much as possible. A combination of maintenance menus to be enlarged can be rationally determined. As a result, in the method (7), when performing the plant maintenance plan, the two requirements that are in a trade-off relationship between the limitation of the budget required for preventive maintenance and the improvement of the profits obtained from the plant operation are compatible. A combination of maintenance menus can be selected.

  (8) In some embodiments according to the present invention, in the above methods (1) to (7), from one or more combinations of the maintenance menu candidates that satisfy at least one constraint condition that the plant equipment should satisfy. A maintenance menu set selection step for selecting a plurality of maintenance menu set candidates, an operation rate calculation step for calculating an operation rate of the plant equipment when each of the maintenance menu set candidates is implemented, and the plurality of maintenance menus Based on the standard operating rate and the operating rate of the plant equipment when no candidate is implemented, the second revenue or the second revenue obtained by operating the plant facility when each of the maintenance menu set candidates is implemented A second profit calculation step of calculating a change in the maintenance menu selection step, The increase amount of the second revenue or second revenue and selects the maintenance menu set candidates having the maximum.

  In the above method (8), the expected operating rate when each maintenance menu is executed in order to determine a combination of maintenance menus in consideration of profits obtained from plant operation within the range of given constraints. Use availability rather than change metrics. Here, the operating rate is an operating rate expected when a maintenance menu set candidate combining two or more maintenance menus is executed. In addition, the maintenance menu set candidate is a combination of two or more maintenance menus selected in advance as satisfying a given constraint condition. As described above, in the method (8), the expected operating rate is obtained for the entire maintenance menu set that satisfies a given constraint condition and is composed of a combination of two or more maintenance menus selected in advance. Evaluate the profits earned from plant operation based on the utilization rate. Therefore, after evaluating the revenue more accurately than when evaluating the revenue from the expected utilization rate change index for individual maintenance menus included in the maintenance menu set candidates, the customer is within the scope of the given constraints. It is possible to determine a combination of maintenance menus in consideration of profits.

  (9) In some embodiments according to the present invention, in the method of (8), the reference operating rate is different from the plurality of maintenance menu candidates, and only the standard maintenance menu of the plant equipment is executed. The expected operating rate of the plant equipment in

  In the method of (9) above, the expected operating rate of the plant equipment when only the standard maintenance menu of the plant equipment is implemented is set as the standard operating rate, and together with the expected operating rate expected for other maintenance menu candidates Evaluate changes in primary revenue. Therefore, the standard maintenance menu is a maintenance menu including inspection items and preventive maintenance items (for example, statutory inspection items and preventive maintenance items) that are minimally necessary regardless of the maintenance cost and actual operation rate requirements. Thus, the reference operating rate can be calculated based on an appropriate standard.

  From the above, at least one embodiment according to the present invention can obtain a plant maintenance planning method that rationally determines a combination of maintenance menus in consideration of a result of evaluating profits expected to be obtained by plant operation. it can.

It is a figure which shows the structure of the plant equipment which concerns on one Embodiment of this invention. It is a figure which shows the relationship between the failure rate of each component apparatus which comprises plant equipment, and operation time. It is a figure which shows the one or more combination (maintenance menu set) of the maintenance menu candidate selected for a plant maintenance plan. It is a figure which shows the whole computer system for the plant maintenance plan which concerns on one Embodiment of this invention. It is a figure which shows the internal structure of the maintenance plan server which concerns on one Embodiment of this invention. It is a figure which shows the whole flow of the plant maintenance planning method which concerns on one Embodiment of this invention. It is a figure which shows the 1st example of the processing flow for selecting the combination (maintenance menu set) of the optimal maintenance menu candidate. It is a figure which shows the 2nd example of the processing flow for selecting the combination candidate of an optimal maintenance menu candidate. It is a figure explaining the example scenario at the time of performing the processing flow shown in FIG. 7 using a numerical example. FIG. 10 is a process flow diagram for explaining an additional process for more appropriately selecting an optimal combination of maintenance menu candidates (maintenance menu set). It is a figure which shows the relationship between the plant operation rate and target operation rate before and after preventive maintenance.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state. On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.
Hereinafter, before describing the maintenance plan method for a plant facility according to some embodiments, an example of the plant facility to which the maintenance plan method is applied will be described with reference to FIG. Next, processing contents of the maintenance planning method will be described with reference to FIGS.

  FIG. 1 shows an example of plant equipment to which a maintenance planning method according to some embodiments of the present invention is applied. The plant facility 1 is a simple specific example of a coal-fired power plant, and has a boiler 2. The boiler 2 includes a furnace wall 4 in which a furnace (combustion chamber) 3 is formed, a burner 5 installed in multiple stages below the furnace wall 4, and an outlet near the furnace 3. An air nozzle 6 for supplying to the furnace 3, a flue 7 connected to the outlet of the furnace 3, a superheater 8, a reheater 9 and an economizer 10 arranged in order from the upper part of the furnace 3 toward the flue 7; And a drum 11 provided at the top of the furnace 5. The furnace wall 4 is configured as a water-cooled wall in which a plurality of water pipes whose tube axis directions are directed in the vertical direction are arranged, and water that is superheated for driving the steam turbine passes through the water-cooled wall.

  The plant facility 1 further supplies a fuel supply means 12 for supplying fuel to the burner 5 and an air supply means 13 for supplying combustion air to the air nozzle 6 (air is supplied from the wind box 13b to the burner 5 via the air duct 13c). For example, and a heat exchanger 13d for exchanging heat between the supply air and the exhaust gas). The plant facility 1 further includes an exhaust gas line 14 for exhausting exhaust gas from the flue 7 to the outside (denitration device 14b interposed in the exhaust gas duct 14a for exhaust gas treatment, an electrostatic precipitator 14c, an induction fan 14d, desulfurization) Device 14e and chimney 14f).

  Further, after water supplied from a water supply pump (not shown) is preheated by exchanging heat with combustion gas in an economizer 10 arranged in a flue gas, it is further superheated while passing through the furnace wall 4, and from water and saturated steam. It becomes a gas-liquid two-phase flow. In this gas-liquid two-phase flow, the saturated water separated from the saturated steam by the drum 11 is sent back to the furnace wall 4 and reheated, and the saturated steam is further superheated by the superheater 8 to become superheated steam. Used to drive steam turbines. Moreover, the steam taken out in the middle of the expansion process by the steam turbine is reheated by the reheater 9 and supplied to the steam turbine again.

Hereinafter, with reference to FIG. 2 thru | or FIG. 6, the maintenance plan method which selects a maintenance menu candidate from several maintenance menu candidates of the plant equipment 1 according to some embodiment of this invention is demonstrated. As described above with reference to FIG. 1, the plant facility 1 is composed of a plurality of devices, and in the following description, these plurality of devices are expressed as component devices D1, D2,. To do. FIG. 2 shows a failure rate curve calculated from the performance of each device, etc., indicating how the failure rate of the component devices D1 to D8 changes with the passage of plant operation time, and using the failure rate curve. In the following, one or more maintenance menu candidates m _{0 to} m _{K as} will be described later are obtained. Here, the entire plant operating time up to the plant cancellation point is divided into a plurality of periods (for example, a first period to an n-th period). In the following description regarding the present embodiment, the standard maintenance menu m ₀ will be described on the assumption that it is a maintenance menu that must be performed at least for the maintenance of the plant equipment 1. Further, optional plurality of maintenance menu candidate m ₁ ~m _K, with the exception of the standard maintenance menu m _0, in order to improve the reliability of the plant equipment 1, which is optionally implemented in the form to be added to the standard maintenance menu m ₀ The description will be made assuming that the maintenance menu is. Each kind of maintenance menu candidates m _{1 to} m _K performs what type of maintenance work item at any time for any of the components D1, D2,..., DJ. Is shown.

In the maintenance planning method according to some embodiments of the present invention, only the standard maintenance menu m ₀ described above is performed, and the plant equipment 1 in the case where a plurality of optional maintenance menu candidates m _{1 to} m _K are not performed. reference operation rate calculating step of calculating a reference operation rate a _b is executed. Here, in an exemplary embodiment, the reference operation rate A _b is different from the plurality of maintenance menu candidate m ₁ ~m _K, plant equipment in the case of performing only standard maintenance menu m ₀ of plant equipment 1 An expected operating rate of 1 may be used. Further, the shape in an exemplary embodiment, a plurality of maintenance menu candidate m ₁ ~m _K, with the exception of the standard maintenance menu m ₀ is to be added in order to improve the reliability of the plant equipment 1, the standard maintenance menu m ₀ It may be an optional maintenance menu that is optionally implemented.

In the present embodiment, the entire operation period of n years until the plant equipment cancellation period is divided into short-term maintenance periods τ _i (1 ≦ i ≦ n) every year, so that the operation rate of the plant equipment and the plant The explanation is based on the assumption that the revenue generated from operation is evaluated at each short-term maintenance period. However, in the present embodiment, the entire operation period may be divided into other lengths of short-term maintenance periods such as every three months or every six months, or non-uniform lengths of short-term maintenance periods.

In one exemplary embodiment, the reference operation rate _Ab is the system reliability such as RAM analysis of the operation rate of the plant equipment 1 that is expected when only the standard maintenance menu m ₀ is executed as the maintenance plan of the plant equipment 1. The expected operating rate calculated using the sex analysis technique may be used. The RAM analysis is an analysis method that has been conventionally used for quantitatively and accurately evaluating the operation rate of a mechanical system such as various plants. In the RAM analysis, the maintenance history data is analyzed from the three viewpoints of reliability, availability, and maintainability from maintenance history data. It is something to evaluate. Specifically, in the RAM analysis, a device failure rate in each of the component devices D1 to DJ constituting the plant facility 1 is obtained based on a failure rate curve as shown in FIG. 2, and the component device D1 in the plant facility 1 is obtained. The operation rate of the entire plant is calculated in consideration of the connection of failures between DJs.

Subsequently, in the maintenance planning method, each maintenance menu candidate is added to the standard maintenance menu m ₀ for each of the plurality of maintenance menu candidates m _{1 to} m _K (maintenance menu m _k (1 ≦ k ≦ K)). An operation rate change index calculating step for calculating an operation rate change index ΔA _k ⁽ⁱ⁾ (1 ≦ k ≦ K, 1 ≦ i ≦ n) of the plant equipment 1 when m _k (1 ≦ k ≦ K) is performed. Executed.

Subsequently, in the maintenance planning method, based on the operation rate change index ΔA _k ⁽ⁱ⁾ (1 ≦ k ≦ K, 1 ≦ i ≦ n) calculated for each maintenance menu m _k (1 ≦ k ≦ K), First profit change calculation step of calculating a first profit change Pc _k (1 ≦ k ≦ K) obtained by operating the plant equipment 1 when each maintenance menu candidate m _k (1 ≦ k ≦ K) is executed. Is executed. The first profit change Pc _k (1 ≦ k ≦ K) is the year in each year (the i-th year (1 ≦ i ≦ n)) when each maintenance menu m _k (1 ≦ k ≦ K) is executed. The revenue Pc _k ⁽ⁱ⁾ is calculated by totaling from the first year to the n-th year, and the annual revenue Pc _k ⁽ⁱ⁾ is calculated by the following formula.

In the above formula, RES _k ⁽ⁱ⁾ is the power sales revenue in each year (i-th year (1 ≦ i ≦ n)) when the maintenance menu candidate m _k (1 ≦ k ≦ K) is executed. In addition, BL _k ⁽ⁱ⁾ indicates that the actual operation rate of the plant is the target operation in each year (i-th year (1 ≦ i ≦ n)) when the maintenance menu m _k (1 ≦ k ≦ K) is executed. Represents the amount of compensation paid to the customer (plant delivery company) or the bonus (bonus) received from the customer when the target operating rate is exceeded when the rate falls below the rate. That is, BL _k ⁽ⁱ⁾ is a positive value when the customer receives compensation, and BL _k ⁽ⁱ⁾ is a negative value when paying a bonus. PMC _k ⁽ⁱ⁾ is the preventive maintenance cost for the entire plant required in each year (i-th year (1 ≦ i ≦ n)) when the maintenance menu m _k (1 ≦ k ≦ K) is executed. It may be acquired from the database 220a of the estimation system 220 described later with reference to FIGS. In addition, CMC _k ⁽ⁱ⁾ is a post-maintenance cost for the entire plant required in each year (i-th year (1 ≦ i ≦ n)) when the maintenance menu m _k (1 ≦ k ≦ K) is executed. It is.

Here, t _k ⁽ⁱ⁾ is the annual power generation time in the i-th year, M _k ⁽ⁱ⁾ is the unit price of electric power sales (yen / MWh) x power generation capacity (MW) in the i-th year, and maintenance in the i + 1 year When the candidate for the menu m _k (1 ≦ k ≦ K) is implemented, and the improvement rate of the annual plant operating rate in the i + 1 year seen from the i year is the operating rate change index ΔA _k ⁽ⁱ⁾ , the electricity sales revenue RES _k ⁽ⁱ⁾ is calculated by the following equation.

また、保守メニューｍ_ｋ（１≦ｋ≦Ｋ）を実施した場合の各年（第ｉ年目（１≦ｉ≦ｎ））における賠償金ＢＬ_ｋ ^（ｉ）は、以下の式により算出される。

上記式において、ｂｏｎｕｓは、プラント実稼働率Ａが目標稼働率Ａ_ｇと比べて１％ずつ上回る毎に賞与が増加する幅を定める単位増加幅である。また、ＬＤは、プラント実稼働率Ａが目標稼働率Ａ_ｇと比べて１％ずつ下回る毎に賠償金が増加する幅を定める単位増加幅である。なお、稼働率変化指標ΔＡ_ｋ ^（ｉ）の具体的な算出方法については後述する。 Bonus BL _k ⁽ⁱ⁾ in each year (i-th year (1 ≦ i ≦ n)) when the maintenance menu m _k (1 ≦ k ≦ K) is executed is calculated by the following equation.

The compensation BL _k ⁽ⁱ⁾ in each year (i-th year (1 ≦ i ≦ n)) when the maintenance menu m _k (1 ≦ k ≦ K) is performed is calculated by the following equation. .

In the above formula, bonus is a unit increment to define the width bonus is increased for each higher than the plant production rate A is by 1% as compared to the target operation rate A _g. Further, LD is a unit increment to define the width compensation is increased for each below the plant production rate A is by 1% as compared to the target operation rate A _g. A specific calculation method of the operation rate change index ΔA _k ⁽ⁱ⁾ will be described later.

In an exemplary embodiment, the operation rate change index ΔA _k ⁽ⁱ⁾ when the maintenance menu candidate m _k (1 ≦ k ≦ K) is executed may be calculated by the following calculation method. As described above, the standard maintenance menu m ₀ is a maintenance menu to be performed at a minimum, and the maintenance menu candidates m _k (1 ≦ k ≦ K) are additionally performed to improve the reliability of the plant equipment. This is a maintenance menu. Therefore, operation rate variation index ΔA k ^_(i) may additionally from contributions by only the standard maintenance menu m ₀ to the plant failure rate in addition to the standard maintenance menu m ₀ Maintenance menu candidate _{m k (1 ≦ k ≦ K} ) It may be calculated as a difference excluding the contribution to the plant failure rate when implemented.

Here, let I_b _j ^{i be} a parameter that represents the contribution to the plant failure rate by only the standard maintenance menu m _{0 for} each device (for each component device Dj (1 ≦ j ≦ J)). Further, in addition to the standard maintenance menu m ₀ , the contribution to the plant failure rate when the maintenance menu candidate m _k (1 ≦ k ≦ K) is additionally performed is classified by device (each component device Dj (1 ≦ j ≦ J )) Let the represented parameter be I_a _j ^{(i, k)} . Then, in an exemplary embodiment, I_b _j ⁱ and I_a _j ^{(i, k)} may be calculated according to the following equations:

In the above formula, DH_b _j ⁱ and DHP_b ⁱ are for each device in the i-th year when only the standard maintenance menu m ₀ is executed (for each component device Dj (1 ≦ j ≦ J)). Represents unplanned downtime and annual plant unplanned downtime. DH_a _j ^{(i, k)} and DHP_a ^{(i, k)} are the year in the i-th year when the maintenance menu candidate m _k (1 ≦ k ≦ K) is additionally implemented in addition to the standard maintenance menu m _0. The unplanned downtime and the annual unplanned plant downtime (for each of the component devices Dj (1 ≦ j ≦ J)) for each device. DH_b _j ⁱ , DHP_b ⁱ , DH_b _j ⁱ and DHP_b ⁱ are the RAMs described above for each of the component devices Dj (1 ≦ j ≦ J) in the i-th year (1 ≦ i ≦ n) in the plant operation period. You may calculate by performing an analysis. Finally, the operation rate change index ΔA _k ⁽ⁱ⁾ may be calculated according to the following formula using the calculation results of I_b _j ⁱ and I_a _j ^{(i, k)} .

Post maintenance costs _CMC ^{k (i),} the configuration device Dj (1 ≦ j ≦ J) for each year in the case of carrying out the maintenance menu _{m k (1 ≦ k ≦ K} ) by RAM assay described above (th i th year ( It is calculated as follows from CMC_b _ij obtained as the subsequent maintenance cost in 1 ≦ i ≦ n)).

上記式は、第１年目〜第ｎ年目にわたる売電収入ＲＥＳ_ｋ ^（ｉ）、賠償金／賞与ＢＬ_ｋ ^（ｉ）、予防保守費用ＰＭＣ_ｋ ^（ｉ）、および事後保守費用ＣＭＣ_ｋ ^（ｉ）から第１収益の変化Ｐｃ_ｋを求める際に、ｉ＋１年目の費用を、割引率（１＋ｒ）^ｉによって現在価値に換算し、ｎ年分の和を求めている。このようにすることにより、各保守メニューｍ_ｋ（１≦ｋ≦Ｋ）を実施した場合において、第１年目〜第ｎ年目にわたる売電収入、賠償金／賞与、予防保守費用および事後保守費用から、より現在価値に即した第１収益の変化を算出することが可能となる。何故なら、決済時期が先延ばしされる費用ほど実質的な現在価値において額面から割り引いて評価することができるからである。 In at least one modified embodiment, the change Pc _k of the first profit when each maintenance menu m _k (1 ≦ k ≦ K) is performed may be calculated by the following equation.

The above formula is obtained from the electricity sales revenue RES _k ⁽ⁱ⁾ , compensation / bonus BL _k ⁽ⁱ⁾ , preventive maintenance cost PMC _k ⁽ⁱ⁾ , and subsequent maintenance cost CMC _k ⁽ⁱ when determining the change Pc _k of the first revenue ^from), i + 1 year of the cost, the current terms of the value by the discount rate (1 + r) ^i, is seeking the sum of n year worth. In this way, when each maintenance menu m _k (1 ≦ k ≦ K) is implemented, the electricity sales revenue, compensation / bonuses, preventive maintenance costs and post-maintenance for the 1st to nth years It is possible to calculate the change in the first profit more in line with the present value from the cost. This is because the cost for which the settlement time is postponed can be evaluated by discounting from the face value at the actual present value.

Subsequently, the maintenance plan method according to some embodiments of the present invention, the change of the first revenue calculated for each of the maintenance menu candidate _{m k (1 ≦ k ≦ K} ) Pc k (1 ≦ k ≦ K) Based on the above, a maintenance menu selection step of selecting an appropriate combination (maintenance menu set) M of maintenance menu candidates is executed. FIG. 3 shows an example of a maintenance menu set selected by the maintenance menu selection step. Maintenance menu set M shown in FIG. 3 is one or more combinations of one or more maintenance menu candidate m _k. In FIG. 3, optional maintenance menu candidates included in the maintenance menu set M are maintenance menu candidates m ₁ , m ₂ , m ₃ , m ₄ , and m ₅ .

Thereby, in the maintenance plan method of the plant equipment which concerns on some embodiment of this invention, the utilization rate change parameter | index of the plant equipment 1 according to the presence or absence of implementation of several maintenance menu candidate _mk (1 <= k <= K). ΔA _k is obtained, and an appropriate combination (maintenance menu set) M of maintenance menu candidates is selected based on the change Pc _k of the first profit calculated based on the operation rate change index ΔA _k . Therefore, in the above maintenance planning method, not only the maintenance cost and the damage cost caused by the plant stoppage are suppressed, but also the profit expected to be obtained by the operation of the plant equipment 1 based on the expected improvement of the plant operation rate. An appropriate combination (maintenance menu set) M of the maintenance menu m _k (1 ≦ k ≦ K) can be rationally determined in consideration of the evaluated result.

  As a result, in the maintenance planning methods according to some embodiments, it is possible to rationally determine a combination of maintenance menus that are sufficiently expected to improve profits obtained from the improvement of the plant operating rate. In addition, in the plant facility maintenance planning method according to some embodiments of the present invention, when determining an appropriate maintenance menu set M ′ in consideration of the revenue obtained by plant operation, the revenue is considered in consideration of the following. Is evaluated. That is, according to the plant long-term maintenance contract, the revenue is evaluated in consideration of the compensation paid to the customer or the bonus received from the customer depending on whether or not the actual operating rate of the plant facility 1 can achieve the target operating rate. Therefore, in the plant facility maintenance planning method according to some embodiments of the present invention, when determining an appropriate maintenance menu set M ′ in consideration of profit, according to the specific provisions of the plant long-term maintenance contract. Therefore, it is possible to appropriately evaluate the profits obtained from plant operation.

As described above, in the present embodiment, the change amount Pc _k of the first profit depending on whether or not each maintenance menu candidate m _k (1 ≦ k ≦ K) is executed is obtained, and based on the change amount Pc _k of the first profit, An appropriate combination (maintenance menu set) M of maintenance menu candidates is selected. Thereby, in this embodiment, the combination of maintenance menu candidates (maintenance menu set) M ′ is appropriately set according to the improvement effect of the customer profit when each maintenance menu candidate m _k (1 ≦ k ≦ K) is executed. Can be selected.

In an exemplary embodiment, in the maintenance menu selection step described above with reference to FIG. 3, combinations of maintenance menu candidates m _k (1 ≦ k ≦ K) satisfying at least one constraint condition to be satisfied by the plant facility 1. (Maintenance menu set) From M _h (h = λ1, λ2,..., Λs), an appropriate combination of maintenance menu candidates (maintenance menu set) M ′ is selected based on the change Pc _k of the first profit. Also good. The at least one constraint condition includes a condition that preventive maintenance costs necessary for the implementation of the maintenance menu candidate m _k (1 ≦ k ≦ K) (maintenance menu set) M _h are within the operation budget of the plant equipment. But it ’s okay. Further, the at least one constraint condition is that the plant equipment when a combination of maintenance menu candidates m _k (1 ≦ k ≦ K) (maintenance menu set) M _h (h = λ1, λ2,..., Λs) is executed. The condition that the expected operating rate of 1 is equal to or higher than the target operating rate _Ag may be included.

Condition that Thus, in this embodiment, the plant expected operating rate A in condition or maintenance period of plant prolonged maintenance Preventive maintenance costs PCM required is within a predetermined budget does not fall below the target operating ratio A _g from maintenance combination of menu candidate (maintenance menu set) M _h, the expected combination of the maintenance menu candidate taking into account the results of evaluating the profitability Pc obtained from the plant operating on the basis of the plant operating rate a is (maintenance menu Set) M ′ can be appropriately selected. On the contrary, in this embodiment, a combination of maintenance menu candidates (maintenance menu set) M _h (selected from the result of evaluating the profit Pc obtained from the operation of the plant based on the expected plant operation rate A (maintenance menu set) M _h ( h = λ1, λ2, ..., out of the λs), plant production rate in conditions or maintenance period of preventive maintenance costs PCM required to plant long-term maintenance is within a predetermined budget does not fall below a target operating rate a _g A combination (maintenance menu set) M ′ of maintenance menu candidates that satisfies the condition can be appropriately selected.

ここで、ＰＭＣ_ｋ ^（ｉ）は、保守メニュー候補ｍ_ｋ（１≦ｋ≦Ｋ）を実施した場合の各年（第ｉ年目（１≦ｉ≦ｎ））において必要となるプラント全体の予防保守費用であり、図４および図５を参照しながら後述する見積もりシステム２２０のデータベース２２０ａから取得されても良い。 Incidentally, the maintenance menu candidate _{m k (k = ε1, ε2} , ..., εq) whether and preventive maintenance plant expected operating rate A when carrying out the maintenance menu set M _h including falls below the target operating ratio A _g In order to determine whether or not the cost PCM falls within a predetermined budget, the expected plant operation rate A and the preventive maintenance cost PMC are calculated as follows. That calculation, maintenance menu candidate _{m k (k = ε1, ε2} , ..., εq) when were performed respectively, when the reference operation rate and A _b, preventive maintenance cost and the plant expected operating rate A is, according to the following formula Is done.

Here, PMC _k ⁽ⁱ⁾ is the whole plant prevention required in each year (the i-th year (1 ≦ i ≦ n)) when the maintenance menu candidate m _k (1 ≦ k ≦ K) is executed. The maintenance cost may be obtained from the database 220a of the estimation system 220 described later with reference to FIGS.

Thus, in this embodiment, when the plant maintenance plan, target operating rate A _g of achievement and prevention tradeoff to each other that increase earnings Pc obtained from sufficiency and plant availability constraints, including budget restrictions required for maintenance A maintenance menu candidate combination (maintenance menu set) M ′ can be selected in such a manner that two related requirements are compatible. Regarding a specific method for selecting an appropriate combination (maintenance menu set) M ′ of maintenance menu candidates in such a manner as to satisfy the two requirements of satisfying the constraints described above and improving profit Pc obtained from plant operation The details will be described later with reference to FIGS.

  In an exemplary embodiment, the maintenance planning method for the plant equipment 1 described above with reference to FIGS. 1 to 3 may be implemented using the computer system 20 shown in FIGS. 4 to 6. In FIG. 4, the computer system 20 may be configured as a system in which the maintenance plan server 100 a, the RAM analysis device 210, the estimation system 220, and the user terminal 230 are interconnected so as to be communicable via the local area network 240. Good. The RAM analyzer 210 and the estimation system 220 may include databases 210a and 220a, respectively, in order to store data managed by the RAM analyzer 210 and the estimation system 220.

  The user terminal 230 is used as an input means for a user to input information and commands to the maintenance plan server 100a, the RAM analysis device 210, and the estimation system 220. The user terminal 230 is also used as output means for displaying output information from the maintenance plan server 100a, the RAM analyzer 210, and the estimation system 220 on the screen.

When the combination of one or more maintenance menu candidates m _k (0 ≦ k ≦ K) is input from the outside, the RAM analyzer 210 detects the failure rate and the component devices of the component devices D1 to DJ constituting the plant facility 1. The expected operating rate of the whole plant is calculated based on the failure connection between D1 to DJ. As shown in FIG. 6, the database 210 a included in the RAM analyzer 210 stores information necessary for calculating the expected operating rate of the entire plant by RAM analysis according to a given combination of maintenance menus. For example, the database 210a included in the RAM analyzer 210 stores data representing failure rate curves, failure rate weighting coefficients, and the like for each component device Dj (1 ≦ j ≦ J) as shown in FIG. The database 210a stores a reliability block diagram in the plant facility 1 and the like.

The estimation system 220 outputs an estimation result of maintenance costs (including preventive maintenance costs) for each of the plurality of maintenance menu candidates m _k (0 ≦ k ≦ K) to the maintenance plan server 100 and the user terminal 230. Further, the estimation system 220 manages information for estimating a maintenance cost for each maintenance menu candidate in the database 220a regarding the maintenance of the plant facility 1. The information managed in the database 220a includes the types of inspections, repairs and preventive maintenance performed on each component device Dj (1 ≦ j ≦ J), the cost required for these, necessary tools, required man-hours, and required parts. In addition, information on the required number of necessary parts and the quantity of necessary parts in stock, and the failure rate reduction amount of each component device Dj when various repair items and preventive maintenance items are implemented (see FIG. 6).

  On the estimation system 220, the person in charge of the device may estimate the cost of the maintenance menu candidate for each device (each of the component devices D1 to DJ). The estimation result may include a detailed estimate including the type, quantity, and effect (failure rate reduction amount and MTTR reduction amount for each component device) of inspection items, repair items, and preventive maintenance items. The estimation system 220 displays an input form for inputting information on the screen of the user terminal 230, and the input form can be edited according to the estimated years and the number of plant systems related to various long-term maintenance projects of the plant equipment 1. It may be. In addition, the input form may be mounted so that a human error can be prevented by having a function of checking an input error or an input omission.

Information necessary for the estimation system 220 to generate an estimation result of the maintenance cost required for each execution of the maintenance menu candidates m _k (0 ≦ k ≦ K) is input to the input form. Also, information for newly creating or updating information stored in the database 220a in FIG. 6 is input to the input form. The above estimation result calculated by the estimation system 220 based on the information entered by each device person in charge from the input form may be notified to the project manager after being finally approved through the approval route designated in advance. Good. The estimation system 220 automatically generates a parts list including spare parts and replacement parts necessary for executing each of the maintenance menu candidates m _k (0 ≦ k ≦ K) from information input by the person in charge of each device. You may make it produce | generate. In addition, the estimation system 220 automatically aggregates maintenance cost estimation results for each maintenance menu candidate obtained from information input by each device person in charge for each device (each of the component devices D1 to DJ). The maintenance cost of the whole plant when the candidate m _k (0 ≦ k ≦ K) is executed is calculated.

In response to a request from the user via the user terminal 230, the maintenance plan server 100 sends a plurality of maintenance menu candidates m _k (0 ≦ k ≦ K) and a preventive maintenance cost PMC for each maintenance menu candidate from the estimation system 220. Receive the estimate results for. Subsequently, the maintenance plan server 100 selects and outputs an appropriate maintenance menu set M ′ to the user terminal 230 according to the procedure described above with reference to FIGS.

  Hereinafter, the detailed internal configuration of the maintenance plan server 100 will be described with reference to FIG. The maintenance plan server 100 includes a CPU 110, a main memory 120, and an interface 130. The CPU 110 reads and executes a computer program stored on the main memory 120 in order to execute the maintenance planning method described above with reference to FIGS. The interface 130 provides a communication path for exchanging data and control signals among the CPU 110, the main memory 120, and the local area network 240. A plurality of program modules or functions constituting the computer program may be read from the main memory 120 by the CPU 110 and executed as the functional modules 111 to 119. Hereinafter, the flow of operations when the above-described maintenance planning method described above with reference to FIGS. 1 to 3 is executed by the above-described functional modules 111 to 119 will be described with reference to FIG.

Prior to the execution of the flow of FIG. 6, the input / output unit 111 communicates with the RAM analyzer 210 and the estimation system 220, and based on the information stored in the databases 210 a and 220 a in FIG. Generate m _k (0 ≦ k ≦ K). The input / output unit 111 also functions as a functional module for the above-described functional modules 112 to 119 to exchange data, control commands, and the like with the main memory 120, the database 210, and the control console 220.

When the input / output unit 111 generates a plurality of maintenance menu candidates m _k (0 ≦ k ≦ K) using the information stored in the databases 220a and 220b, the process starts from step S01, and the standard maintenance menu An evaluation of m ₀ is performed. More specifically, in step S01, to determine the execution subject devices and implementation time as maintenance items to be included in the standard maintenance menu m _0. The decision reference operation rate calculating means 112a is repeated to be maintenance item, carried target device, the trial and error of calculating the reference operation rate A _b of the plant equipment 1 while variously changing the implementation period, the reference operation rate You may make it complete | finish when _Ab becomes an appropriate value. Subsequently, in step S02, it is determined whether or not a constraint condition that the cost required for the plant maintenance work is within the operation budget is imposed. If the constraint condition is imposed, the process proceeds to step S05 and imposed. If not, the process proceeds to step S03.

In step S03, each of a plurality of optional maintenance menu candidates m _{1 to} m _K that may be added to the standard maintenance menu m ₀ is evaluated. Specifically, in step S03, the following two steps are performed. As the processing of the first stage, operating rate change index calculation means 113a is of plant equipment 1 in the case of carrying out each of the maintenance menu candidate _{m k (1 ≦ k ≦ K} ) is an addition to the standard maintenance menu m ₀ The operating rate change index ΔA _k ⁽ⁱ⁾ (1 ≦ k ≦ K, 1 ≦ i ≦ n) is calculated. Subsequently, as a process of the second stage, the first revenue change calculating means 114a, based on the reference operation rate _{A b} and uptime change index ^{_{ΔA k (i) (1 ≦}} k ≦ K, 1 ≦ i ≦ n) Then, when each maintenance menu candidate m _k (1 ≦ k ≦ K) is executed, a change Pc _k (1 ≦ k ≦ K) of the first profit obtained by the operation of the plant facility 1 is calculated.

Subsequently, when the execution of step S03 ends, the process proceeds to step S04. In step S04, one or more combinations (one or more maintenance menu candidates m _k) based on the change Pc _k of the first profit calculated for each maintenance menu candidate m _k (1 ≦ k ≦ K) ( Maintenance menu set) M ′ is selected. Specifically, in step S04, the maintenance menu selection unit 115 performs the following three steps. First, step S04A is executed as the first stage process. In step S04A, selected from among a plurality of maintenance menu set _{M h (1 ≦ h ≦ H} ), the constraint condition is satisfied maintenance menu set M _.lambda.1 ~M _{[lambda] s} of plant expected operating rate A exceeds the target operation rate _{A g} Is done. In step S04A, the profit Pc _(h) obtained by the plant operation when the maintenance menu sets M _{λ1 to} M _λs are respectively executed is calculated based on the first profit change Pc _k (1 ≦ k ≦ K). calculate. In an exemplary embodiment, if each maintenance menu candidate included in the maintenance menu set M _h is m _k (k = ε1, ε2,..., Εq), m _k (k = ε1, ε2,. revenue Pc _(h) is obtained by summing the changes Pc _k of the first revenue corresponding for all.

Subsequently, step S04B may be executed as a second-stage process. Step S04B is an optional additional process for recalculating the revenue so that the revenue obtained from the plant operation is more appropriately evaluated when the maintenance menu sets M _{λ1 to} M _λs are executed. Execution of this step may be omitted. As will be described later with reference to FIG. 11 and FIG. 12, the recalculated profits when the maintenance menu sets M _{λ1 to} M _λs are executed are the values for the maintenance menu sets M _{λ1 to} M _λs . Called 2 earnings.

Subsequently, step S04C is executed as a third-stage process. In step S04C, at least one optimum maintenance menu set M ′ is selected from the maintenance menu sets M _{λ1 to} M _λs based on the above-described profit Pc _(h) . Here, the profit obtained by operating the plant when the maintenance menu sets M _{λ1 to} M _λs are respectively executed may be calculated based on the change Pc _k (1 ≦ k ≦ K) of the first profit, The profit (second profit) recalculated for the maintenance menu sets M _{λ1 to} M _λs in step S04B that is optionally executed may be used.

If it is determined in step S02 that a constraint condition that the cost required for the plant maintenance work is within the operation budget is imposed, the process proceeds to step S05. In step S05, each of a plurality of optional additional maintenance menu candidates m _{1 to} m _K that may be added to the standard maintenance menu m ₀ is evaluated. Specifically, in step S05, the following three steps are performed. The processes of the first stage and the second stage are the same as the processes of the first stage and the second stage in S03. In the third stage of processing, the cost effectiveness when each maintenance menu candidate m _k (1 ≦ k ≦ K) is implemented is evaluated for each maintenance menu candidate m _k (1 ≦ k ≦ K).

Subsequently, when the execution of step S05 ends, the process proceeds to step S06. In step S06, based on a change Pc _k of the first revenue calculated for each of the maintenance menu candidate _{m k (1 ≦ k ≦ K} ), one or more maintenance menu candidate _m k respectively (1 ≦ k ≦ K) One or more appropriate maintenance menu sets M ′ are selected from one or more combinations (maintenance menu sets) M _h (1 ≦ h ≦ H). Specifically, in step S06, the maintenance menu selection means 115 performs the following three steps. First, step S06A is executed as the first stage process. In step S06A, the cost requirement for plant maintenance is determined in advance from the plurality of maintenance menu sets M _h (1 ≦ h ≦ H) that satisfies the constraint that the expected plant operating rate exceeds the target operating rate. Maintenance menu sets M _{λ1 to} M _λs that satisfy the constraint that they fall within the operational budget are selected. Further, in step S06A, the profit obtained by the plant operation when each of the maintenance menu sets M _{λ1 to} M _λs is executed is calculated based on the change Pc _k of the first profit. Subsequently, step S06B and step S06C may be executed as the processing of the second stage and the third stage. Since the processing content of step S06B is the same as that of step S04B and step S04C, description is abbreviate | omitted.

  Hereinafter, the detailed operation flow in step S04 of FIG. 6 executed by the maintenance menu selection unit 115a (FIG. 5) will be described with reference to the flowchart of FIG. In the flowchart of FIG. 7, operations corresponding to step S04B are omitted from steps S04A to S04C constituting step S04 of FIG. Of the steps S04A to S04C constituting step S04 in FIG. 6, the entire operation flow of step S04 when the operation corresponding to step S04B is additionally executed will be described later with reference to FIGS.

In the operation flow shown in the flowchart of FIG. 7, all of one or more maintenance menu candidates m _k (k = ε1, ε2,..., Εq) that increase the first profit are selected. Subsequently, if only the selected maintenance menu candidate m _k (k = ε1, ε2,..., Εq) does not satisfy at least one constraint condition that the plant facility 1 should satisfy, the constraint condition is satisfied. , At least one of the remaining maintenance menu candidates m _k (k ≠ ε1, ε2,..., Εq) is added. More specifically, if only the selected maintenance menu candidate m _k (k = ε1, ε2,..., Εq) does not satisfy the constraint, the remaining maintenance menu candidates m until the constraint is satisfied. _k (k ≠ ε1, ε2,..., εq) are added in order from the candidate with the smallest decrease in the first profit.

In the processing according to the flowchart of FIG. 7, the customer revenue is maximized by selecting all the maintenance menu candidates m _k (k = ε1, ε2,..., Kp) that increase the first revenue, and the selected maintenance menu is selected. In the candidate group, the maintenance menu candidates m _k (k ≠ ε1, ε2,..., Kp) are selected in order from the small customer profit decrease range only when the above constraint conditions cannot be satisfied. That is, in the process according to the flowchart of FIG. 7, it is possible to rationally determine a combination of maintenance menu candidates m _k that theoretically maximizes the first profit within a range in which a desired constraint condition can be satisfied. As a result, in the process according to the flowchart of FIG. 7, when performing a plant maintenance plan, two demands that are in a trade-off relationship between improvement in profits obtained from plant operation and satisfaction of desired constraints to be satisfied by the plant are compatible. The combination of the maintenance menu candidates m _k can be selected in such a way as to cause

In the flowchart of FIG. 7, processing is started from step S401, and a list of K maintenance menu candidates m _k (1 ≦ k ≦ K) that can be implemented by adding to the standard maintenance menu m ₀ is created. For each of the K maintenance menu candidates m _k (1 ≦ k ≦ K) in the above list, a first profit change Pc _k (1 ≦ k ≦ K) is calculated in step S03 of FIG. It is associated with the menu candidate m _k (1 ≦ k ≦ K). Subsequently, in step S401, the K maintenance menu candidates m _k (1 ≦ k ≦ K) in the list are sorted in descending order using the first profit change Pc _k (1 ≦ k ≦ K) as a key. If the change of the first revenue during the list _{Pc k (1 ≦ k ≦ K} ) is present a plurality of maintenance menu candidate m _k equal to each other, of the plurality in order value of .DELTA.A _k is greater maintenance menu candidate m _k Sort. Here, ΔA _k represents a change amount in which the expected operating rate of the entire plant equipment 1 varies when the maintenance menu candidate m _k is added to the standard maintenance menu m ₀ and executed.

Subsequently, the process proceeds to step S402, where the index value _k for identifying the maintenance menu candidate m _k is set to 1 (k = 1), and the maintenance menu set M _h composed of a combination of one or more maintenance menu candidates is identified. The index value h to be set is set to 1 (h = 1). Subsequently, the process proceeds to step S403 to determine whether Pc _k is greater than zero (whether Pc _k > 0). If it is determined in step S403 that Pc _k > 0 (YES), the process proceeds to step S408, the maintenance menu candidate m _k is added to the maintenance menu set M1, and the index value for identifying the maintenance menu candidate m _k. The value of k is incremented by 1 (k = k + 1). Subsequently, the process returns to step S403, and steps S403 and S408 are repeatedly executed while incrementing the index value k by 1 until Pc _k ≦ 0. As described above, the process of selecting all the one or more maintenance menu candidates m _k (k = ε1, ε2,..., Εq) that increase the first profit is executed.

When it is determined in step S403 that Pc _k ≦ 0 (NO), the process proceeds to step S404, and the expected operation rate A of the entire plant equipment 1 expected when the maintenance menu set M1 is executed is calculated. whether the target operation rate a _g or higher (whether the a ≧ a _g) are determined. Here, if the maintenance menu candidate included in the maintenance menu set M1 is m _k (k = ε1, ε2,..., Εq), the expected operating rate A of the entire plant facility 1 is calculated according to the above-described equation (8). May be.

If it is determined not to become _A ≧ A _g (NO) in step S404, the maintenance menu candidate the selected _{m k (k = ε1, ε2} , ..., εq) alone, at least to be satisfied by the plant equipment 1 Processing is performed when one constraint is not satisfied. Specifically, if it is determined not to become _A ≧ A _g (NO) in step S404, the process proceeds to step S406. In step S406, it sets the index value h to 2 identifies the maintenance menu set _{M h} (h = 2). All maintenance menu candidates m _k (k = ε1, ε2,..., Εq) included in the maintenance menu set M1 are included in the maintenance menu set M2 in advance. Subsequently, the process proceeds to step S407, and the maintenance menu candidate with the smallest decrease in the first revenue is maintained from the maintenance menu candidates m _k (k ≠ ε1, ε2,..., Εq) that satisfy Pc _k ≦ 0. Add to menu set M2. Subsequently, the process returns to step S404, until it is determined that the _A ≧ A _g (YES), step S406 and step S407 are repeatedly executed. Became A ≧ _{A g} in step S404 when it is determined that (YES), the processing proceeds to step S405, ends the output and the process as an optimum solution candidate maintenance menu set M2.

  Next, in the operation flow shown in FIG. 6, the detailed processing flow of step S06A, which is the first stage of step S06, that is executed when the constraint condition that the cost required for plant maintenance work is within the operation budget is imposed. Will be described with reference to the flowchart of FIG. The flowchart shown in FIG. 8 is executed by the maintenance menu selection unit 115a (FIG. 5).

In the operation flow shown in the flowchart of FIG. 8, first, for at least one maintenance menu set candidate M _h composed of a combination of two or more maintenance menu candidates, the preventive maintenance cost PMC necessary for the execution of the maintenance menu set candidate M _h is It is determined whether or not the budget is within the operation budget B of the facility 1. Subsequently, in the operation flow shown in the flowchart of FIG. 8, when the preventive maintenance cost PMC exceeds the operation budget B, the maintenance menu set candidate M _h (1 ≦ h) so that the preventive maintenance cost falls within the operation budget. Remove at least one maintenance menu candidate m _k from ≦ H). In an exemplary embodiment, when the preventive maintenance cost PMC exceeds the operation budget B, maintenance is performed in order from the maintenance menu candidates m _{k that} are less cost-effective until the preventive maintenance cost PMC falls within the operation budget B. may be Yuku remove from the menu set candidate M _h.

In the process shown in the flowchart of FIG. 8, each maintenance menu candidate m _k combination (maintenance menu set) _Mh is executed within the range in which the preventive maintenance cost PMC necessary for the implementation of M _h can be contained within the predetermined operation budget B. the combination of the maintenance menu candidate m _k to maximize the first revenue while considering the cost-effectiveness of the maintenance menu candidate m _k can be determined (maintenance menu set candidates) M _h. That is, in the process shown in the flowchart of FIG. 8, even if there is an upper limit to the budget for paying the maintenance service fee, as long as the budget B allows, the maintenance menu candidate m _k that is not cost-effective is not implemented as much as possible. A combination of maintenance menus that make the first profit as large as possible can be reasonably determined. As a result, in the process shown in the flowchart of FIG. 8, when performing a plant maintenance plan, two requirements that are in a trade-off relationship between the limitation of the budget B required for preventive maintenance and the improvement of profits obtained from plant operation are reconciled. A combination of maintenance menu candidates m _k (maintenance menu set) M _h can be selected.

In the flowchart of FIG. 8, the process is started from step S601, and a list of K maintenance menu candidates m _k (1 ≦ k ≦ K) that can be implemented by adding to the standard maintenance menu m ₀ is created. For each of the K maintenance menu candidates m _k (1 ≦ k ≦ K) in the above list, the first profit change Pc _k (1 ≦ k ≦ K) and the preventive maintenance cost PMC _{k in} step S05 of FIG. (1 ≦ k ≦ K) is calculated and associated with each maintenance menu candidate m _k (1 ≦ k ≦ K). Here, the preventive maintenance cost PMC _k (1 ≦ k ≦ K) represents the cost for preventive maintenance that occurs when the maintenance menu candidate m _k (1 ≦ k ≦ K) is executed. In step S601, the K maintenance menu candidates m _k (1 ≦ k ≦ K) in the list are sorted in descending order using the first profit change Pc _k (1 ≦ k ≦ K) as a key. If the change of the first revenue during the list _{Pc k (1 ≦ k ≦ K} ) is present a plurality of maintenance menu candidate m _k equal to each other, of the plurality in order value of .DELTA.A _k is greater maintenance menu candidate m _k Sort. Here, ΔA _k represents a change amount in which the expected operating rate A of the entire plant equipment 1 varies when the maintenance menu candidate m _k is added to the standard maintenance menu m ₀ .

Subsequently, the process proceeds to step S602, and a cost-effectiveness index is calculated for each of the K maintenance menu candidates m _k (1 ≦ k ≦ K) included in the list. In an exemplary embodiment, K maintenance menu candidates m _k (1 ≦ k ≦ K) in the above list corresponding to the first change in revenue Pc _k (1 ≦ k ≦ K) and the preventive maintenance cost PMC. _k (1 ≦ k ≦ K) is ranked as an evaluation index. Then, Rank _k that is a rating value of each maintenance menu candidate m _k (1 ≦ k ≦ K) may be calculated by the ranking. Rating value Rank _k corresponding to the maintenance menu candidate _{m k} is the maintenance menu is an example of index indicating the cost-effectiveness of a candidate _{m k,} Rank _k well as cost-effective small, Rank larger _{k is,} cost The effect is bad. In an exemplary embodiment, Rank _k which is a rating value of each maintenance menu candidate m _k (1 ≦ k ≦ K) is calculated as follows. As a result of sorting the K maintenance menu candidates m _k (1 ≦ k ≦ K) in descending order of the first profit change Pc _k (1 ≦ k ≦ K), the maintenance menu candidate m _ε1 is ranked g from the top. In this case, the Pck rank value of the maintenance menu candidate m _ε1 is set to g. Further, when the K maintenance menu candidates m _k (1 ≦ k ≦ K) are sorted in ascending order of the preventive maintenance cost PMC _k (1 ≦ k ≦ K), the maintenance menu candidate m _ε1 becomes the f-th place. Is the PMC rank value of the maintenance menu candidate m _ε1 . On top of that, the calculation result of the Rank _k for the maintenance menu candidate m maintain g + f menu candidate m _.epsilon.1 Pck a value and PMC value obtained by summing the values of the rank of the rank of _.epsilon.1.

Subsequently, the process proceeds to step S603, the index value _k for identifying the maintenance menu candidate m _k is set to 1 (k = 1), and the maintenance menu set candidate M _h composed of a combination of one or more maintenance menu candidates is selected. The index value h to be identified is set to 1 (h = 1). Subsequently, the process of the flowchart illustrated in FIG. 8 proceeds to a loop process including steps S604, S605, S611, S612, S613, and S614. In this loop processing, one or more maintenance items included in the maintenance menu set candidate M _h are determined until a maintenance menu set candidate M _h that achieves the target operating rate and the preventive maintenance cost is within the budget is determined. The process of replacing the menu candidate m _k is repeated. Further, in this loop processing, each time one or more maintenance menu candidates m _k included as elements in the maintenance menu set candidate M _h are replaced, the plant operation rate and the preventive maintenance when the current maintenance menu set candidate M _h is executed. Reevaluate costs. When the maintenance menu set candidate M _h that achieves the target operating rate and the preventive maintenance cost is within the budget is determined by repeating this loop process, the process proceeds to step S606.

Hereinafter, a specific operation flow of the loop processing described above will be described with reference to FIG. Above loop process starts from step S604, the one plant expected operating rate A in the case of carrying out the maintenance menu set candidate M _h is the target operation rate A _g or more (or the A ≧ A _g) is determined . If the process is determined not a A ≧ _{A g} in step S604 (No), the process proceeds to step S614, the maintenance menu candidate _{m k} is added to the maintenance menu set candidate _{M 1,} maintenance menu candidate _{m k} Is incremented by 1 (k = k + 1). Subsequently, the process returns to step S604, until the A ≧ _{A g,} step S604 and step S614 while incrementing the value of the index value k by 1 are repeated. That is, in the above flow, A ≧ _{A g} and made by performing an iterative process repeatedly executes steps S604 and step S614 until, A ≧ _{A g} and until maintenance menu Maintenance candidate _{m k} menu set candidates _{M 1} Add one by one. As described above, the maintenance menu set candidate M _h (h = 1 at this time) in which the plant expected operation rate A is larger than the target operation rate _Ag is generated. In this case, it is assumed that the maintenance menu set M _h includes one or more maintenance menu candidates m _k (k = ε1, ε2,..., Εq).

Subsequently, the process proceeds to step S605, and whether or not the preventive maintenance cost PMC required for executing the maintenance menu set candidate M _h (h = 1 at this time) is equal to or less than the operation budget B (PMC ≦ B). Whether or not) is determined. Note that the preventive maintenance cost PMC required for executing the maintenance menu set candidate M _h (h = 1 at this time) is the maintenance menu candidate included in the maintenance menu set candidate M _h as m _k (k = ε1, If ε2,..., εq), they may be calculated according to the above-described equation (9).

If it is determined in step S605 that PMC ≦ B is not satisfied (No), the process proceeds to step S611, and the maintenance menu candidates included in the maintenance menu set candidate M _h are m _k (k = ε1, ε2,... Εq ), The maintenance menu candidate having the worst cost-effectiveness is removed. In an exemplary embodiment, the maintenance menu set candidate M maintenance menu included in the _h candidate _{m k (k = ε1, ε2} , ..., εq) from the value of the corresponding rating value Rank _k is maximum maintenance Remove menu candidates. Subsequently, the process proceeds to step S612, cost-effective to recalculate the preventive maintenance costs PMC required when carrying out the maintenance menu set candidate M _h after removal of the maintenance menu candidate having the worst. The above-described operations in step S611 and step S612 are for performing the following processing when the preventive maintenance cost required when the maintenance menu set candidate _Mh is executed exceeds the budget. That is, in this process, the maintenance menu candidate m _k (k = ε1, _k) included in the maintenance menu set candidate M _h until the preventive maintenance cost PMC required for executing the maintenance menu set candidate M _h is equal to or less than the budget. This is a process for recalculating the preventive maintenance cost PMC each time, while removing the maintenance menu candidates one by one in the order of poor cost effectiveness from (ε2,..., εq).

Then, processing proceeds to a step S613, whether preventive maintenance costs PMC required when becomes less operational budget B for implementing a maintenance menu set candidate M _h (whether the PMC ≦ B) is determined again The If it is determined in step S613 that PMC ≦ B is not satisfied (No), the process returns to step S611, and steps S611 and S612 are repeatedly executed until PMC ≦ B. In step S613 when it is determined that a PMC ≦ B, the process returns to step S604, the maintenance menu set candidate M plant operating rate A to be expected _{when h} implementing the target operation rate A _g or more (A ≧ If A _g ), the process proceeds again to step S605. If it is determined in step S605 that PMC ≦ B, the process proceeds to step S606.

At step S606, the adding maintenance menu set candidate _{M h} as an element to the set M_opt comprising one or more candidate solutions. Subsequently, the process proceeds to step S607, the incremented by one index value h identifies the maintenance menu set candidate _{M h (h = h + 1} ). Subsequently, the process proceeds to step S608, the maintenance menu set candidate M _h can be added to the maintenance menu candidate whether at least one is present is determined. Here, the maintenance menu candidates that can be added are any maintenance menu set candidates M _h (h = λ1, λ2, belonging to the solution candidate set M_opt among the maintenance menu candidates in the list generated in step S601. .., Λs) are maintenance menu candidates m _k not included. In step S608, the if addable maintenance menu candidate is at least one present, the process proceeds to step S610, the in terms of adding a single additional possible maintenance menu candidate in the maintenance menu set candidate M _h, step S605 Return to. If there is no maintenance menu candidate that can be added in step S608, one or more maintenance menu set candidates M _h (h = λ1, λ2,..., Λs) belonging to the solution candidate set M_opt are output and the process is terminated. .

Next, refer to the numerical table shown in FIG. 9 for an exemplary scenario when the operation flow from step S601 to step S614 described above with reference to the flowchart of FIG. 8 is simulated using actual numerical examples. While explaining. Each row constituting the numerical table shown in FIG. 9 corresponds to each maintenance menu candidate m _k (1 ≦ k ≦ 30). In Table 9, numbers within k-th row from the top corresponds to the maintenance menu candidate m _k. In the table of FIG. 9, the numerical value included in the k-th row from the top is the change in the first profit (Pc _k ) expressed in units of 10,000 yen for the maintenance menu candidate m _k and the prevention expressed in units of 10,000 yen. The maintenance cost (PMC _k ), Pc _k rank, PMC _k rank, rating value Rank _k (= Pck rank + PMCk rank) and ΔA _k are respectively represented.

The numerical table shown in FIG. 9 is obtained as a result of executing steps S601 to S603 in the flowchart of FIG. 8 based on the sample values for simulation execution. At that time, in the case shown in FIG. 9, when the maximum amount B of the available operational budget of 700 yen, the target operating rate A _g of plant equipment 1 to 80%, were performed only standard maintenance menu m ₀ assuming reference operation rate a _b of the plant equipment 1 and were set at 78%. Using the numerical example shown in the table of FIG. 9, the simulation execution after step S604 in the flowchart of FIG. 8 is performed as follows.

First, the iterative process of repeatedly executing steps S604 and S614 until A ≧ A _g is performed, thereby adding maintenance menu candidates m _k to maintenance menu set candidates M ₁ one by one until A ≧ A _g. I will do it. As a result, the maintenance menu set candidate M ₁ includes the maintenance menu candidates {m ₀ , m ₁ , m ₂ , m ₃ , m ₄ , m ₅ }. On top of that, when the maintenance menu set if the candidate _{M 1} is performed obtaining the operation rate A of plant equipment 1 in (maintenance menu candidate _m 0 ~m ₉ is if implemented), next to 81.016%, the target operating It can be seen that the ratio A _g = 80% (A ≧ A _g is satisfied). Further, when the maintenance menu set if the candidate _{M 1} is performed obtaining the preventive maintenance costs PMC required (if the maintenance menu candidate _m 0 ~m ₉ is performed), it becomes PMC = 770 yen, operational budget B = 700 You can see that it exceeds 10,000 yen.

Subsequently, the processing of the flowchart of FIG. 8 proceeds to a stage in which steps S611, S612, and S613 are repeatedly executed. In this stage, until the preventive maintenance cost required when the maintenance menu set candidate M ₁ is conducted is to fit within budget, Rank value of _k in the descending order (the order cost effective poor) maintenance menu set M _The maintenance menu candidate m _k is removed from ₁ . Therefore, when out of the maintenance menu set candidate _{M 1} removes the maintenance menu candidate _{m 4,} maintenance menu candidates included in the maintenance menu set candidates _{M 1} and _{{m 0, m 1, m} 2, m 3, m 5} Become. In that case, preventive maintenance cost required when the maintenance menu set candidate M ₁ is conducted becomes PMC = 500 yen, since below the operational budget B = 700 yen, the budget range. Moreover, the plant operating rate A when the maintenance menu set candidate _{M 1} is carried out, becomes 80.004%, even target operating rate _{A g} is achieved because above target operating rate _A g = 80%.

Subsequently, the process proceeds to step S606 in FIG. 8, lower than the operational budget B = 700 yen, and the maintenance menu set candidate _{M 1} also target utilization rate _A g = 80% is achieved as the solution components candidate set M_opt Add more. Subsequently, the process proceeds to step S607 in FIG. 8, a step which has been treated Maintenance menu set candidate M ₁ as h = 1, proceeds to the step of processing the maintenance menu set candidate M ₂ as h = 2. Subsequently, the process proceeds to step S608 of FIG. 8, since the maintenance menu candidate m _k which can newly added to the maintenance menu candidates included in the maintenance menu set candidate M ₁ does not exist anymore, the process proceeds to step S609. In step S609, the process ends the maintenance menu set candidates included as a solution to a solution candidate set M_opt outputs a (M_opt = a _{{M 1})} M_opt as _{M 1.}

Next, the flow of detailed processing operations executed in step S04B of FIG. 6 will be described with reference to FIGS. In the flowchart shown in FIG. 11, in step S04B of FIG. 6, the process of calculating the second profit for the maintenance menu set candidates M _{λ1 to} M _λs includes the maintenance menu selection unit 115b, the constraint condition satisfaction determination unit 117b, and the operation rate. The operation | movement flow in the case of being additionally performed by the calculation means 118b and the 2nd profit calculation means 119b is shown.

The process of the flowchart shown in FIG. 10 starts from step S701. In step S701, the value of the index value _h for identifying the maintenance menu set candidate Mh is set to 1 (h = 1 is set), and in step S04, the maintenance menu set selected based on the sufficiency of the constraint condition is set. The number of candidates M _{λ1 to} M _λs is set as the value of the parameter hCount. Among the selected maintenance menu set candidates M _{λ1 to} M _λs , the expected plant operation rate exceeds the target operation rate from among a plurality of maintenance menu sets M _h (1 ≦ h ≦ H) in step S04A of FIG. This is a maintenance menu set selected as a maintenance menu set candidate that satisfies the constraint condition.

Subsequently, the process proceeds to step S702, the maintenance menu plant equipment 1 operating rate A when the set candidate M _h is performed to calculate the RAM analysis, the value of the maintenance menu set M _h index value h identifies the Is incremented by 1 (h = h + 1). The above-mentioned operation rate A ′ _h of the plant equipment 1 is instructed by the operation rate calculation means 118 to the RAM analyzer 210 so that the plant operation rate when the entire maintenance menu set candidate M _h is executed is calculated by RAM analysis. It is obtained by doing.

何故なら、この場合には、標準保守メニューｍ_０を実施するだけで、プラント設備１の目標稼働率Ａ_ｇを達成できてしまう。ここで、顧客（プラント納入先企業）から受け取る賞与は、本来であれば、標準保守メニューｍ_０に加えて保守メニューセット候補Ｍ_ｈを追加的に実施した場合について受け取れる差引収支であるが、標準保守メニューｍ_０を実施しただけの場合には、目標稼働率Ａ_ｇを上回った分について顧客（プラント納入先企業）から受け取れる賞与は、ＢＬ＝（Ａ−Ａ_ｂ）×ｂｏｎｕｓとなる。この場合には、追加の保守メニュー候補ｍｋ（１≦ｋ≦Ｋ）を実施した場合の稼働率Ａが基準稼働率Ａ_ｂを上回る分（Ａ−Ａ_ｂ）に賞与単価ｂｏｎｕｓを乗じて算出される賞与ＢＬを顧客から受け取れる。この場合のＡ、Ａ_ｂおよびＡ_ｇの三者の間の大小関係は、図１２の数値軸８１上に９１ａおよび９１ｂとして示したＡおよびＡ_ｂとＡ_ｇとの間の関係に対応する。ステップＳ７１１の実行が終わると、処理はステップＳ７０８に進む。 Subsequently, the process proceeds to step S703, whether the A _g ≦ A _b and the relationship is established between the reference operation rate A _b and the target utilization rate A _g in the case of performing only standard maintenance menu m ₀ judge. If the relationship holds, the process proceeds to step S711, and in step S711, a bonus BL paid by the customer (plant delivery destination company) to the plant seller is calculated according to the following equation.

Because, in this case, only to implement the standard maintenance menu m _0, we can achieve the target operating rate A _g of plant equipment 1. Here, bonuses received from the customer (plant delivery partners), if the original, is a net balance that can be received for the case where the additional implementation of the maintenance menu set candidate M _h in addition to the standard maintenance menu m _0, standard in the case of only were carried out maintenance menu _{m 0} is, bonuses can receive from the customer (plant delivery partners) about the amount that exceeds the target occupancy rate _{a g} is a _{BL = (a-a b)} × bonus. In this case, it is calculated by multiplying the portion (A−A _b ) in which the operation rate A when the additional maintenance menu candidate mk (1 ≦ k ≦ K) is performed exceeds the reference operation rate A _b by the bonus unit price bonus. Bonus BL can be received from customers. Magnitude relationship between the three parties this A case, _{A b} and _{A g} correspond to the relationship between A and _{A b} and _{A g,} shown as 91a and 91b on the value axis 81 in FIG. 12. When the execution of step S711 ends, the process proceeds to step S708.

この場合には、標準保守メニューｍ_０を実施するだけでは、プラント設備１の目標稼働率Ａ_ｇを達成できないので、稼働率不足分Ａ_ｇ−Ａ_ｂと賠償金単価ＬＤとの積に相当する賠償金を顧客に支払わなくてはならなかったはずである。それと同時に、この場合には、追加の保守メニュー候補を実施した場合の稼働率Ａが目標稼働率Ａ_ｇを上回る分（Ａ−Ａ_ｇ）に賞与単価ｂｏｎｕｓを乗じて算出される賞与ＢＬを顧客から受け取れる。従って、顧客に支払わなくてはならなかったはずの賠償金と稼働率Ａが目標稼働率Ａ_ｇを上回る分の賞与の差引収支が顧客（プラント納入先企業）とプラント販売元の差引収支に相当するＢＬの値となる。この場合のＡ、Ａ_ｂ、Ａ_ｃａｐおよびＡ_ｇの四者の間の大小関係は、図１２の数値軸８２上に９２ａおよび９２ｂとして示したＡおよびＡ_ｂとＡ_ｇおよびＡ_ｃａｐとの間の関係に対応する。ステップＳ７１２の実行が終わると、処理はステップＳ７０８に進む。 If a relationship of A _g ≦ A _b does not hold between the reference operating rate A _b and the target operating rate A _g in step S703, the process proceeds to step S704, where A _cap <A _b <A _g and A _g ≦ It is determined whether or not the relationship A is satisfied. If the relationship holds, the process proceeds to step S712, and in step S712, a bonus BL paid by the customer (plant delivery destination company) to the plant seller is calculated according to the following equation.

In this case, only carrying out the standard maintenance menu m _0, you can not achieve the target operating rate A _g of plant equipment 1, corresponding to the product of the compensation unit price LD insufficient operating rate component A _g -A _b The compensation must have been paid to the customer. At the same time, in this case, the customer bonuses BL is calculated by multiplying the amount (A-A _g) the bonus bid bonus occupancy rates A in the case of carrying out additional maintenance menu candidate exceeds the target operation rate A _g Can be received from. Therefore, equivalent net balance of the amount of bonus compensation and utilization A that would have had to be paid to the customer exceeds the target operating rate A _g is the customer (plant delivery partners) to the net balance of the plant vendor BL value to be used. _A in this case, A _b, magnitude relation between the four's _{A cap} and _{A g} are between A and _{A b} and _{A g} and _{A cap} shown as 92a and 92b on the value axis 82 in FIG. 12 Corresponds to the relationship. When the execution of step S712 ends, the process proceeds to step S708.

この場合には、標準保守メニューｍ_０に追加する形で追加の保守メニュー候補ｍ_ｋ（１≦ｋ≦Ｋ）を実施しても依然としてプラント設備１の目標稼働率Ａ_ｇを達成できない。この場合、標準保守メニューｍ_０とは別に保守メニューセット候補Ｍ_ｈを追加的に実施した分に相当する稼働率変化（Ａ−Ａ_ｂ）について受け取れたはずの賞与をプラント販売元は受け取れないので、顧客（プラント納入先企業）とプラント販売元の差引収支がＢＬの値となる。そこで、標準保守メニューｍ_０に追加する形で追加の保守メニュー候補ｍ_ｋ（１≦ｋ≦Ｋ）を実施した場合の稼働率Ａが基準稼働率Ａ_ｂを上回った分に賠償金単価ＬＤを乗じた額を顧客（プラント納入先企業）に支払う賠償金ＢＬとする。この場合のＡ、Ａ_ｂ、Ａ_ｃａｐおよびＡ_ｇの四者の間の大小関係は、図１２の数値軸８３上に９３ａおよび９３ｂとして示したＡおよびＡ_ｂとＡ_ｇおよびＡ_ｃａｐとの間の関係に対応する。なお、Ａ_ｃａｐとはプラント稼働率Ａがこの値を下回っても、当該下回った分に応じた賠償金増額分が発生しない稼働率下限値を意味する。ステップＳ７１３の実行が終わると、処理はステップＳ７０８に進む。 If the relationship A _cap <A _b <A _g and A _g ≦ A does not hold in step S704, the process proceeds to step S705, and the relationship A _cap <A _b <A _g and A _cap <A <A _g is satisfied. It is determined whether or not holds. If the relationship holds, the process proceeds to step S713, and in step S713, a bonus BL paid by the customer (plant delivery destination company) to the plant distributor is calculated according to the following equation.

In this case, not still able to achieve the target operating rate A _g of plant equipment 1 also perform additional maintenance menu candidate is an addition to the standard maintenance menu _{m 0 m k (1 ≦ k} ≦ K). In this case, the plant distributor cannot receive the bonus that should have been received for the change in operating rate (A-A _b ) corresponding to the additional execution of the maintenance menu set candidate M _h separately from the standard maintenance menu m ₀ . The balance of balance between the customer (plant recipient company) and the plant seller is the BL value. Therefore, the compensation bids LD to a separatory occupancy rates A when in the form of added to the standard maintenance menu m ₀ was performed additional maintenance menu candidate m _k a ₍₁ ≦ k ≦ K) exceeds the reference operation rate A _b The amount multiplied is used as compensation BL to be paid to the customer (plant delivery company). _A in this case, A _b, magnitude relation between the four's _{A cap} and _{A g} are between A and _{A b} and _{A g} and _{A cap} shown as 93a and 93b on the value axis 83 in FIG. 12 Corresponds to the relationship. In addition, _Acap means the operation rate lower limit which does not generate | occur | produce the compensation increase amount according to the amount which fell even if the plant operation rate A fell below this value. When the execution of step S713 ends, the process proceeds to step S708.

この場合には、標準保守メニューｍ_０に追加する形で追加の保守メニュー候補ｍ_ｋ（１≦ｋ≦Ｋ）を実施しても依然としてプラント設備１の目標稼働率Ａ_ｇを達成できないだけでなく、基準稼働率Ａ_ｂが稼働率下限値Ａ_ｃａｐ以下となってしまう。そこで、標準保守メニューｍ_０に追加する形で追加の保守メニュー候補ｍ_ｋ（１≦ｋ≦Ｋ）を実施した場合の稼働率Ａが稼働率下限値Ａ_ｃａｐを上回った分に賠償金単価ＬＤを乗じた額を顧客（プラント納入先企業）に支払う賠償金ＢＬとする。この場合のＡ、Ａ_ｂ、Ａ_ｃａｐおよびＡ_ｇの四者の間の大小関係は、図１２の数値軸８４上に９４ａおよび９４ｂとして示したＡおよびＡ_ｂとＡ_ｇおよびＡ_ｃａｐとの間の関係に対応する。ステップＳ７１４の実行が終わると、処理はステップＳ７０８に進む。 If the relationship A _cap <A _b <A _g and A _cap <A <A _g does not hold in step S705, the process proceeds to step S706, where A _cap ≧ A _b and A _cap <A <A _g. It is determined whether or not holds. If the relationship holds, the process proceeds to step S714, and in step S714, a bonus BL paid by the customer (plant delivery destination company) to the plant seller is calculated according to the following equation.

In this case, not only still able to achieve the target operating rate A _g of plant equipment 1 also perform additional maintenance is an addition to the standard maintenance menu m ₀ menu candidate _{m k (1 ≦ k ≦ K} ) , the reference operation rate _{a b} becomes less operation rate limit value _{a cap.} Therefore, the compensation unit price LD is calculated as the operating rate A exceeds the operating rate lower limit A _cap when the additional maintenance menu candidate m _k (1 ≦ k ≦ K) is added to the standard maintenance menu m _0. The amount multiplied by is the compensation amount BL to be paid to the customer (plant delivery company). _A in this case, A _b, magnitude relation between the four's _{A cap} and _{A g} are between A and _{A b} and _{A g} and _{A cap} shown as 94a and 94b on the value axis 84 in FIG. 12 Corresponds to the relationship. When the execution of step S714 ends, the process proceeds to step S708.

If the relationship A _cap ≧ A _b and A _cap <A <A _g does not hold in step S706, the process proceeds to step S707. In this case, corresponding to the situation shown on the numerical axis 85 in FIG. 12, the reference operation rate _Ab and the additional maintenance menu candidate m _k (1 ≦ k ≦ K) when only the standard maintenance menu m ₀ is executed are further calculated. Both of the operating rates A when implemented are below the operating rate lower limit A _cap . _A in this case, A _b, magnitude relation between the four's _{A cap} and _{A g} are between A and _{A b} and _{A g} and _{A cap} shown as 95a and 95b on the value axis 85 in FIG. 12 Corresponds to the relationship. Therefore, in this case, an increase in compensation paid to the customer (plant delivery destination company) does not occur (BL = 0). When the execution of step S707 ends, the process proceeds to step S708.

In step S 708, the maintenance menu set candidate _{M h,} using the value of the above-described step S702 and step operation rate A calculated in S711~S714 _'h and bonus / compensation BL, maintenance menu set candidate _{M h} The second profit Pc ′ _h obtained by operating the plant is calculated. Note that the second profit Pc ′ _h obtained by operating the plant when the maintenance menu set candidate M _h is executed is the above-described expressions (1) and (2) for calculating the change Pc _k of the first profit. It may be calculated based on the same concept. However, the second profit Pc ′ _h is not the operation rate change index ΔA _k ⁽ⁱ⁾ corresponding to each maintenance menu candidate m _k, but the operation rate corresponding to the maintenance menu set candidate M _h by the second revenue calculation means 119. The difference is that it is calculated using A ′ _h .

Subsequently, the process proceeds to step S709, in step S709, h <whether the hCount is determined, h <process when the hCount the processing for the maintenance menu set candidate _{M 1} returns to step S702 from the process proceeds to the maintenance menu set candidate M _2. If h <hCount is not satisfied in step S709, the process proceeds to step S710. By repeating the loop processing from step S702 to S709 as many times as equal to hCount, when step S710 is executed, the second profit Pc ′ _h (h) for each of the maintenance menu set candidates M _{λ1 to} M _λs. = Λ1, λ2,..., Λs). In step S710, selects 'the maintenance menu _{set h} is the maximum optimum plant maintenance schedule M' second revenue Pc from among a plurality of maintenance menu set M _.lambda.1 ~M _{[lambda] s} as.

In the embodiment described above with reference to FIGS. 10 to 12, in order to determine a combination of maintenance menu candidates m _k in consideration of customer revenue within a given constraint condition, individual maintenance menu candidates m _k are determined. The operation rate A ′ _h is used instead of the operation rate change index ΔA _k ⁽ⁱ⁾ expected in the case of implementation. Here, the operation rate A ′ _h is an operation rate expected when a maintenance menu set candidate M _{h in} which two or more maintenance menu candidates m _k are combined is executed. In addition, the maintenance menu set candidate M _h is a combination of two or more maintenance menu candidates m _k selected in advance as satisfying a given constraint condition. As described above, in the embodiment described above with reference to FIGS. 10 to 12, the maintenance menu set candidate M satisfying a given constraint condition and including a combination of two or more maintenance menu candidates m _k selected in advance. _The expected operating rate A ′ _h is obtained for the entire _h , and the profit is evaluated based on the operating rate A ′ _h . Accordingly, the revenue is evaluated more accurately than when the first revenue is evaluated by accumulating the operation rate change index ΔA _k ⁽ⁱ⁾ for the individual maintenance menu candidates m _k included in the maintenance menu set candidate M _h. Thus, it is possible to determine a combination of maintenance menu candidates m _k considering customer profits within a given constraint condition.

DESCRIPTION OF SYMBOLS 1 Plant equipment 2 Boiler 3 Furnace 4 Furnace wall 5 Burner 6 Air nozzle 7 Flue 8 Superheater 9 Reheater 10 Economizer 11 Drum 12 Fuel supply means 13 Air supply means 13a Pushing ventilator 13b Wind box 13c Air duct 13d Heat exchanger 14 exhaust gas line 14a exhaust gas duct 14b denitration device 14c electric dust collector 14d induction ventilator 14e desulfurization device 14f chimney 20 computer system 81, 82, 83, 84, 85 numerical axis 100 maintenance plan server 111 input / output unit 112 reference operating rate calculation means 113 Operating rate change index calculating means 114 First profit change calculating means 115 Maintenance menu selecting means 116 Restriction condition satisfaction determining means 118 Operating rate calculating means 119 Second profit calculating means 120 Main memory 130 Interface 210 RAM analyzer 210a Database 20 quotation system 220a database 230 user terminal 240 local area network

Claims (9)

A maintenance planning method for selecting a maintenance menu from a plurality of maintenance menu candidates for plant equipment,
For each of the plurality of maintenance menu candidates, an operation rate change index calculating step for calculating an operation rate change index indicating a change in the operation rate of the plant equipment depending on whether or not the maintenance menu candidate is implemented,
A first profit change calculation step for calculating a change in the first profit obtained by the operation of the plant equipment depending on whether or not each of the maintenance menu candidates is implemented based on the operation rate change index;
A maintenance menu selection step of selecting a combination of the maintenance menu candidates based on the first revenue calculated for each of the maintenance menu candidates;
A maintenance planning method for plant equipment, comprising: In the maintenance menu selection step,
The combination of the maintenance menu candidates is selected based on a change in the first profit from a combination of the maintenance menus that satisfy at least one constraint condition that the plant equipment should satisfy. Maintenance planning method for plant equipment.   The at least one constraint condition is that the preventive maintenance cost necessary for the implementation of the combination of maintenance menu candidates is within the operation budget of the plant facility, or the combination of the maintenance menu candidates is performed. 3. The plant facility maintenance planning method according to claim 2, comprising at least one of the conditions that the expected operation rate of the plant facility is equal to or higher than a target operation rate. In the maintenance menu selection step,
Selecting all of the one or more maintenance menu candidates that increase the first revenue,
If only the selected one or more maintenance menu candidates do not satisfy at least one constraint condition that the plant equipment should satisfy, at least one of the remaining maintenance menu candidates is satisfied so as to satisfy the at least one constraint condition. The maintenance plan method for plant equipment according to any one of claims 1 to 3, wherein one is added. In the maintenance menu selection step,
If only the selected one or more maintenance menu candidates do not satisfy the at least one constraint, the amount of decrease in the first revenue among the remaining maintenance menu candidates until the at least one constraint is satisfied. 5. The maintenance plan method for plant equipment according to claim 4, wherein candidates are added in order from a candidate with a small number. In the maintenance menu selection step,
For a maintenance menu set candidate consisting of a combination of two or more maintenance menu candidates, determine whether the preventive maintenance cost necessary for the implementation of the maintenance menu set candidate falls within the operation budget of the plant equipment,
The at least one maintenance menu candidate is removed from the maintenance menu set candidates so that the preventive maintenance cost is within the operation budget when the preventive maintenance cost exceeds the operation budget. Item 4. The plant facility maintenance planning method according to any one of Items 3 to 4. In the maintenance menu selection step,
For a maintenance menu set candidate consisting of a combination of two or more maintenance menu candidates, determine whether the preventive maintenance cost necessary for the implementation of the maintenance menu set candidate falls within the operation budget of the plant equipment,
When the preventive maintenance cost exceeds the operation budget, the maintenance menu candidates are removed from the maintenance menu set candidates in order from the low cost effectiveness until the preventive maintenance cost falls within the operation budget. The maintenance planning method for plant equipment according to claim 6. A maintenance menu set selection step of selecting a plurality of maintenance menu set candidates consisting of one or more combinations of the maintenance menu candidates that satisfy at least one constraint condition to be satisfied by the plant equipment;
When each of the maintenance menu set candidates is implemented, an operation rate calculating step for calculating an operation rate of the plant equipment,
Second revenue obtained by operation of the plant equipment when each of the maintenance menu set candidates is executed based on the reference operation rate and the operation rate of the plant equipment when the plurality of maintenance menu candidates are not executed Or a second revenue calculating step for calculating a change in the second revenue,
In the maintenance menu selection step,
The plant facility maintenance planning method according to any one of claims 1 to 7, wherein the maintenance menu set candidate that maximizes the second revenue or the amount of increase in the second revenue is selected. 9. The system according to claim 1, wherein the reference operating rate is an expected operating rate of the plant equipment when only the standard maintenance menu of the plant equipment is executed, which is different from the plurality of maintenance menu candidates. The maintenance planning method for plant equipment according to claim 1.

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