JP2004271043A - Medical agent management method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medical agent management method and a medical agent management device capable of accurately grasping the present stock quantity, properly managing the medical agent by estimating the future change of the stock quantity of medical agent, and achieving the stable operation of a waste incineration plant by preventing the occurrence of the stock shortage. <P>SOLUTION: This medical agent management method has a step for calculating the usage of the medical agent per waste unit mass on the basis of the past operation record of the waste incineration plant, a step for calculating the present stock quantity of medical agent, and a step for estimating the change of the stock quantity of medical agent on the basis of the usage of medical agent per waste unit mass calculated in the medical agent usage calculating step, the present stock quantity of medical agent calculated in the medical agent stock quantity calculating step, and the operation schedule data of the waste incineration plant. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a medicine management method and a medicine management device suitable for a waste incineration plant using a plurality of kinds of medicines.
[0002]
[Prior art]
Conventionally, factory chemical managers sequentially check the stock status of multiple chemicals used to remove, absorb, and neutralize harmful components contained in exhaust gas and wastewater generated at refuse incineration plants, which hinders operation. Inventory management was performed by ordering and replenishing drugs so that they did not come.
[0003]
JP-A-2000-007100 (Patent Literature 1) discloses a method of managing inventory of chemicals and the like, which considers past refueling results at the time of refueling as a method of managing the amount of kerosene in a kerosene tank. A method has been proposed in which the time required for the next refueling is described on a slip to prevent forgetting to give a kerosene delivery instruction.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-007100
[Problems to be solved by the invention]
In refuse incineration plants, slaked lime, activated carbon, and ammonia water are used to remove, absorb, and neutralize harmful components discharged from refuse incinerators, or to adjust the components of utilities such as water and air used in the plant. Many chemicals are used, such as urea water, caustic soda and the like. If these chemicals are lost, it will not be possible to treat harmful components contained in exhaust gas, wastewater, etc., or to adjust components of utilities such as water and air used in factories, which will hinder operation. Therefore, drug inventory management is important for stable operation.
[0006]
However, the capacity of the storage device in which the medicine is stored differs for each medicine, and how the waste is consumed for each medicine due to the operation / stop of the refuse incinerator and fluctuations in the amount of incineration. Therefore, the time when the stock of each drug runs out varies, and the management of the stock by the administrator becomes complicated, and there is a possibility that order forgetting may occur. This is the same when the method described in Patent Document 1 is used.
[0007]
In addition, even when daily inventory management is performed, a shortage of inventory may occur when the consumption of medicine exceeds the prediction due to a sudden increase in the processing amount. In particular, in a storage tank in which the level meter of the remaining amount management of the medicine is not a continuous type, for example, in a storage tank in which the content is powder, the above problem is conspicuous when the processing amount suddenly increases just before the lower limit level. Appears in
[0008]
The present invention has been made in order to solve the above-mentioned problems.In addition to accurately grasping the current stock amount, the medicine management is appropriately performed by predicting the future change of the stock amount of the medicine, and the occurrence of the stock shortage occurs. It is an object of the present invention to provide a medicine management method and a medicine management apparatus capable of achieving a stable operation of a refuse incineration plant by preventing garbage incineration.
[0009]
[Means for Solving the Problems]
The above problem is solved by the following invention.
[1] A medicine management method for managing a medicine used in a refuse incineration plant, wherein a medicine use amount calculating step for calculating the use amount of the medicine per unit mass of the refuse incineration plant based on past operation result data of the incineration plant And a medicine stock amount calculating step of calculating a current medicine stock amount, and a current medicine amount calculated by the medicine use amount per garbage unit mass calculated by the medicine use amount calculation step and a current medicine amount calculated by the medicine stock amount calculation step. A medicine management method, comprising: a stock amount transition prediction step of predicting a change in a stock amount of a medicine based on a stock amount and operation plan data of a waste incineration plant.
[2] In the above [1], if the stock amount of the medicine after a predetermined period falls below the predetermined amount based on the change prediction of the stock amount predicted by the stock amount change prediction step, an order instruction for the medicine is issued. A drug management method, comprising an order instruction prompting step for prompting.
[3] A drug management device that manages the inventory of drugs used in a refuse incineration plant, and calculates the amount of drug used per unit mass of refuse based on the past operation results data of the refuse incineration plant Means, a medicine stock amount calculating means for calculating the current medicine stock amount, a medicine use amount per unit mass of waste calculated by the medicine use amount calculation means, and a current medicine calculated by the medicine stock amount calculation means. And a stock amount transition predicting means for predicting a change in the stock amount of the medicine based on the stock amount of the waste and the operation plan data of the waste incineration plant.
[4] In the above [3], when the medicine stock amount after a predetermined period falls below the predetermined amount based on the change prediction of the stock amount predicted by the stock amount change prediction means, the order of the medicine is urged. A medicine management device comprising an order instruction prompting means.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an example of an embodiment of the present invention will be described.
[0011]
FIG. 1 is a diagram showing an example of a configuration of a refuse incineration plant to which the present invention is applied. A refuse incineration plant 1 shown in FIG. 1 includes a refuse incinerator 2 for incineration of incoming refuse, an exhaust gas treatment facility 3 for detoxifying harmful components in exhaust gas discharged from the refuse incinerator 2, and refuse. A wastewater treatment facility 4 for detoxifying wastewater generated in the incineration plant 1 and a storage tank 5 for storing chemicals used in the waste incinerator 2, exhaust gas treatment facility 3 and wastewater treatment facility 4 are provided. Here, the chemicals used in the refuse incineration plant 1 are carried by truck or tank lorry for each chemical and stored in separate storage tanks.
[0012]
The configuration of the refuse incineration plant to which the present invention is applied can take various configurations depending on the scale of the refuse incinerator, emission standards for exhaust gas, wastewater, and the like.
[0013]
FIG. 2 is a block diagram illustrating an example of a configuration of the medicine management device according to the present invention. The medicine management device 6 according to the present invention includes a medicine use amount calculating means 7 for calculating the use amount of medicine per unit mass of garbage based on the past operation results data 11 of the garbage incineration plant, and a current medicine use amount. The medicine stock amount calculating means 8 to be calculated, the amount of medicine used per unit mass of garbage calculated by the medicine use amount calculating means 7, the current amount of medicine calculated by the medicine stock amount calculating means 8 and the garbage incineration plant. And a stock amount transition estimating means 9 for estimating a change in the stock amount of the medicine based on the operation plan data 12 of FIG.
[0014]
Further, the medicine management device 6 according to the present invention, when the medicine stock amount after a predetermined period falls below a predetermined amount based on the change prediction of the stock amount predicted by the stock amount change prediction means 9, It is preferable to have order instruction prompting means 10 for prompting an order instruction.
[0015]
A computer or the like is used as the medicine management device.
[0016]
Hereinafter, each step performed in each of the above-described units will be described.
[0017]
[Drug Usage Calculation Step (Drug Usage Calculation Means)]
In this step, the amount of chemicals used per unit mass of the waste is calculated based on the past operation result data of the waste incineration plant.
[0018]
The amount of harmful components generated is determined by the amount of refuse treated, the components of refuse when incinerated, and the combustion state. At present, the components of the refuse cannot always be measured, and even if the same refuse components are in different combustion states, the amount of harmful components generated may differ. However, current waste incinerators are controlled and operated by an automatic combustion control device, so that the same amount of harmful components is generated for the same waste components.
[0019]
Regarding the harmful components contained in the exhaust gas, the concentration of the harmful components discharged from the chimney is continuously measured by an exhaust gas analyzer usually installed in front of a chimney outlet. The supply amount of the drug is determined by feedback control based on the concentration measured by the analyzer so that the concentration of the harmful component in the chimney is not more than the operation control concentration. For this reason, the amount of harmful components generated in the furnace cannot be directly grasped, and no analyzer capable of directly measuring dioxins has been established at present. Therefore, the amount of harmful components generated in the furnace and the concentration of dioxins in the chimney cannot be continuously measured.
[0020]
Therefore, it is not possible to directly measure the concentration of harmful components generated in the furnace, and it is necessary to estimate the amount of chemicals used per unit mass of garbage based on the amount of chemicals supplied.
[0021]
(1) The supply amount of the chemical is calculated from a flow meter installed in a supply pipe for supplying the chemical to the refuse incinerator 2, the exhaust gas treatment equipment 3, and the wastewater treatment equipment 4, or a level meter of the storage tank 5. Method If it is a liquid such as ammonia water or urea water to remove nitrogen oxides in exhaust gas, caustic soda to remove hydrogen chloride or sulfur oxides, the integrated value from the flow meter, or in the storage tank The supply amount can be calculated by the continuous type level meter.
[0022]
(2) Method for calculating the amount of chemicals used per unit mass of garbage Because the amount of harmful components generated cannot be measured directly, the generation of harmful components indirectly from the amount of waste processed and the amount of heat generated when burning garbage when incinerated Estimate the amount and determine the amount of drug used per unit mass of waste. Since the harmful components generated by combustion depend on the waste composition, a waste heat value depending on the waste composition is used here.
[0023]
The amount of refuse can be measured from the load of refuse and the interval between refuse when the refuse is charged into the furnace. In addition, the calorific value (Hu) of the garbage, which indicates the calories per unit mass of the garbage, is calculated from the heat balance and the material balance of the incinerator at the time of burning the garbage. Normally, Hu is calculated by a combustion control computer from a balance calculation of a refuse supply amount, a gas amount, an in-furnace temperature, a supply air amount, a supply water amount, and the like when the refuse is injected into the refuse incinerator.
[0024]
FIG. 3 shows an example of an estimation model function Fi for the required amount of medicine (kg / h). This function Fi is determined based on past operation result data in the refuse incineration plant, chemical consumption (kg / h), incineration treatment amount (kg / h), Hu (kcal / kg), and chimney outlet concentration (ppm). Is done. Here, the past operation results data, chemical consumption (kg / h), incineration amount (kg / h), Hu (kcal / kg), chimney outlet concentration (ppm), etc. are obtained from the waste incineration plant. Data stored in a database in the management computer to be managed can be used.
[0025]
The function Fi may be, for example, an approximate curve as shown in FIG. 3, or may be formulated by a table method.
[0026]
Since the characteristics of the function Fi may change due to changes in the calorific value due to aging of the equipment or changes in the waste composition, for example, it is preferable to review the function from the operation results data of the past year for each year. .
[0027]
The function Fi shown in FIG. 3 can be expressed by the following equation (1).
Fi = Fi (R, Hu, Seti) (1)
Here, i: each harmful component, Fi: required amount of chemicals for removing the i component (kg / h), R: incineration amount (kg / h), Hu: refuse calorific value (kcal / kg), Seti : Indicates the target concentration (ppm) of the chimney outlet of the i component.
[0028]
[Drug stock amount calculation step (drug stock amount calculation means)]
In this step, the current medicine inventory is calculated for each type of medicine.
[0029]
(1) When the medicine is in a liquid state The stock Wa of each medicine in the medicine storage tank at present is the current water level position from the level meter of the storage tank represented by the following equation (2) or the following equation (3) ) Can be calculated from the integration formula of the consumption flow rate from when the storage tank is full.
Wa = F _Li (Li) (2)
Here, the stock amount F _Li by the level meter is a function for calculating the stock amount of the medicine i at the level Li.
Wa = Wf−Σ (fi) (3)
Here, fi is the actual operation flow rate value of the medicine i, and Wf is the amount when the medicine storage tank is full.
[0030]
(2) When the drug is in powder form When the drug is in powder form such as activated carbon for adsorbing dioxin and slaked lime for removing hydrogen chloride and sulfur oxides, for example, the powder is blown with a blower air or the like. Is carried out and supplied to the flue. In this case, the supply amount of the medicine i can be calculated by the following equation (4) from the relationship hi between the rotation speed r of the feeder that cuts out the powder and the cutout amount.
fi = hi (r) (4)
Further, a method of managing the amount of drug used by a level meter of the storage tank can be used. However, in the case of a powder material, a state from empty to full is managed by three on-off level meters (high, medium, low), for example, not in a continuous type level meter but in a discrete type. It is common. However, in this case, if the amount of use suddenly increases just before the lower limit level, there may be a case where the stock amount of the medicine becomes insufficient.
[0031]
Therefore, in the present invention, in the case of the discrete level meter, the stock amount is managed by the following method.
[0032]
Stock amount when the level switch sw _n is changed on, determined in g (sw _n). However, the on switch sw _n of a level n until the switch sw n _{+ 1} of the next n + 1 is turned on, the level is not known. For this reason, the stock amount Wa between sw _n and sw _{n + 1} is the integrated value of the medicine supply amount from the time when sw _n is turned on until sw _n is turned on and the next switch sw _{n + 1} is turned on. Using Σ (fi), the stock amount is calculated by the following equation (5).
Wa = g (sw _n ) −Σ (fi) (5)
Here, fi is the supply amount based on the operation results of the medicine i.
[0033]
As a result, it is possible to more accurately manage the amount of medicine used, and it is possible to more accurately manage the stock amount.
[0034]
In addition, the required amount Fi (kg / h) of the medicine for removing the i component is represented by the above equation (1).
[Inventory change forecast means]
In this step, the amount of drug used per unit mass of garbage calculated in the drug use amount calculation step, the current drug inventory amount calculated in the drug stock amount calculation step, and the operation plan data of the waste incineration plant The change of the stock amount of the medicine is predicted based on this.
[0035]
Here, as the operation plan data of the refuse incineration plant, for example, operation plan data stored in a database in a management computer that manages the refuse incineration plant can be used.
[0036]
The prediction of the change of the chemical stock amount is performed by estimating the required chemical amount model of the formula (1), the planned incineration amount (R) based on the operation plan data, the target concentration (Seti) of the harmful component at the smoke outlet, and the incineration from now on This can be performed by calculating the future drug consumption based on the calorific value Hu of the waste. Note that the calorific value Hu of the refuse may fluctuate due to the influence of the season, so it is preferable to determine the calorific value Hu with reference to the past operation results. For example, it is preferable to use the calorific value Hu of waste in the same month in the past.
[0037]
The number of days t until the stock of the drug used for removing the harmful component i is exhausted is calculated for each type of drug by the following equation (6).
t = Wa / Fi / 24 (6)
Further, by using the daily operation plan data after the present time, it is also possible to obtain a change in daily inventory until the inventory is exhausted.
[0038]
This makes it possible to accurately and appropriately manage the medicines by predicting the future change in the stock amount of each medicine based on the operation plan data for each medicine.
[Order instruction prompting means]
In this step, if the medicine stock amount after a predetermined period falls below the predetermined amount based on the change forecast of the stock amount predicted in the stock amount change prediction step, an order to order the medicine is prompted.
[0039]
It is preferable that the predetermined period is individually determined based on a delivery date from ordering to delivery of each medicine. Further, the predetermined amount is an amount appropriately determined for each medicine, and for example, can be set to a case where the stock amount is zero.
[0040]
The time from ordering to delivery generally differs depending on the ordering agent or the type of drug. Further, even when ordering the same medicine, the time until delivery may vary depending on the ordering time. For this reason, the past order results for each drug are compiled into a database (order result data 13) so that the drug inventory can be safely secured, and the order timing is determined based on the database. For example, based on the average (t _M ) or max (t _MAX ) of the time from ordering to delivery until now and the number of days t until the stock of the drug of the above formula (6) runs out, the following formula (7) is used. Alternatively, when the condition of the following equation (8) is satisfied, the timing for placing an order can be set.
t ≦ t _M (7)
t ≦ t _MAX (8)
In this way, by prompting the ordering instruction for each medicine from the medicine management device 6, it is possible to prevent shortage of stock, and to achieve stable operation of the refuse incineration plant.
[0041]
【The invention's effect】
As described above, according to the present invention, it is possible to accurately grasp the current stock amount, appropriately manage the medicine by predicting the future change in the stock amount of the medicine, and prevent the occurrence of the stock shortage. The present invention provides a medicine management method and a medicine management apparatus capable of achieving stable operation of a waste incineration plant.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a configuration of a refuse incineration plant to which the present invention is applied.
FIG. 2 is a block diagram illustrating an example of a configuration of a medicine management device according to the present invention.
FIG. 3 is a diagram showing an example of an estimation model function Fi of a drug required amount (kg / h) according to the present invention.
[Explanation of symbols]
Reference Signs List 1 refuse incineration plant 2 refuse incinerator 3 exhaust gas treatment equipment 4 wastewater treatment equipment 5 storage tank 6 medicine management device 7 medicine use amount calculation means 8 medicine stock amount calculation means 9 inventory amount transition prediction means 10 order instruction prompting means 11 operation result data 12 Operation plan data 13 Order result data

Claims (4)

A drug management method for managing drugs used in a refuse incineration plant,
A chemical use amount calculating step of calculating a chemical use amount per unit mass of the waste based on past operation results data of the waste incineration plant,
A drug stock amount calculating step of calculating the current drug stock amount;
Based on the amount of medicine used per unit mass of garbage calculated in the medicine use amount calculating step, the current amount of medicines calculated in the medicine stock amount calculation step, and the operation plan data of the garbage incineration plant, the amount of medicine stock. And a stock amount transition prediction step of predicting a transition of the medicine. Based on the transition prediction of the inventory amount predicted by the inventory amount transition prediction step, if the inventory amount of the medicine after a predetermined period is less than the predetermined amount, it may have an order instruction prompting step for prompting an order instruction of the medicine. The drug management method according to claim 1, wherein A medicine management device that manages inventory of medicines used in a refuse incineration plant,
A chemical consumption calculating means for calculating a chemical usage per unit mass of waste based on past operation results data of the waste incineration plant,
A medicine stock amount calculating means for calculating the current medicine stock amount;
Based on the amount of medicine used per unit mass of garbage calculated by the medicine use amount calculating means, the current amount of medicine calculated by the medicine stock amount calculating means, and the operation plan data of the waste incineration plant, the stock amount of the medicine. And a stock amount transition estimating means for estimating the transition of the medicine amount. When the medicine stock amount after a predetermined period is less than a predetermined amount based on the change forecast of the stock amount predicted by the stock amount change prediction means, an order instruction prompting means for prompting an order instruction of the medicine is provided. The drug management device according to claim 3, wherein

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