JP3477901B2 - Unit control device for sludge digestion gas generator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to power generation using digestion gas generated from sludge treatment equipment at a sewage treatment plant (digestion gas power generation). The present invention relates to a device for automatically controlling the number of sludge digestion gas generators. 2. Description of the Related Art In a sewage treatment plant, operation management is performed by a relatively large-scale centralized monitoring facility, but monitoring and operation are mainly performed by an operator, and comprehensive operational support is provided for each facility. It is desired to respond. [0003] In recent years, the concept of cogeneration has become widespread, and in urban sewage treatment plants, power is generated by using digestive gas generated from sludge treatment equipment, and plays an auxiliary role in supplying power within the treatment plant. That is, the generator is rotated and driven by the sludge digestion gas engine as a prime mover, and the generated power is supplied together with the purchased power. Generally, a plurality of generators are installed, and the number of generators that operate according to the load is controlled. [0004] The amount of digestive gas generated from sludge and the amount of electric power used in a sewage treatment plant fluctuate depending on the season, the day of the week, the time, and the like. In order to maintain the balance, the digestion gas power generation will be performed automatically while observing the operation status of the sludge treatment equipment. And the control accuracy is reduced. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a sludge digestion gas generator number control device capable of sequentially increasing the control accuracy. [0006] The present invention SUMMARY OF] is the power generating plant sludge digestion gas engines in sewage treatment plants the generator is installed a plurality of prime mover, sludge digestion gas generation amount
Digestion gas generation data that accumulates data on fluctuation patterns
Power file to store data and power usage data
Data file and digestion gas generation and power consumption data
Starring a creation unit digestion gas generation amount setting pattern is created and power consumption setting pattern creation section, a pattern created by both setting creation section by the data stored in the over datafile
Calculated, and the season, day of week, time seek generator load pattern by day, and the generator operation number determination unit which determines the number of operating while the generator load prediction based on this load pattern, the determination unit Currently operating generator cab determined in
And a generator operation scale number determining unit that emits decrease directive for that number in comparison with the number, and the power usage of the digestion gas generation amount
When detecting and determining the number of generators to be operated by predicting the load of the generator, a correction is made to the amount of generated power by the variation pattern of the amount of digested gas generated, and the calculation factor of the number of generators to be operated is calculated. load pattern of the generator, the data accumulated in the fluctuation pattern of the sludge digestion gas generation amount, by also in the range and updates the parameters used in calculating the number of operating the generator. The power consumption and the amount of digested gas generated are detected,
The load pattern of the generator and the variation pattern of the amount of digested gas generated are input to the computer according to the day of the week and the time of the day. Then, when the load of the generator is predicted to determine the number of generators to be operated, the generated power amount is corrected based on the variation pattern of the amount of digested gas generated. That is, it is used as a calculation factor of the number of generators operated.
Data on the load pattern of the generator and the fluctuation pattern of the amount of digested gas generated are accumulated and analyzed, and the parameters used when calculating the number of generators operated are updated. This allows
As the number of times of control increases, a pattern close to reality can be obtained, and control accuracy increases sequentially. The present invention will be described below with reference to an embodiment shown in the drawings. An embodiment of the apparatus for controlling the number of sludge digestion gas generators according to the present invention is shown in FIGS. 1 is a configuration diagram, FIG. 2 is a graph showing changes in the amount of power consumption and the amount of digested gas generated during a day, FIG. 3 is an explanatory diagram of correction of a target value, and FIG. 4 is an explanatory diagram showing a relationship between energy amounts. Figure 5 is a data model,
FIG. 6 is an explanatory diagram of a process of creating a setting pattern, and FIG. 6 is an operation screen. As shown in FIG. 1, the apparatus of the present invention is roughly classified into an OPS (Operating Station) 10 and a PCS (Process Control Station) 20. OPS10
Is a man-machine interface having a plurality of CRTs and monitoring plant operation. The PCS 20 is a control device that incorporates and executes an automatic operation program for plant equipment, and includes an input / output processing unit 21, a generator operation number determination unit 22, and a generator operation unit determination unit 23. The OPS 10 includes a power usage data file 11
P and digestion gas generation data file 11G, power consumption model creation unit 12P and digestion gas generation model creation unit 12
G, a power consumption setting pattern creating unit 13P and a digestion gas generation amount setting pattern creating unit 13G.
It receives data on the amount of power used and the amount of digested gas generated from the input / output processing unit 21 of 0, and sends each set pattern to the calculation unit 22A of the generator number determination unit 22. A system including the OPS 10 and the PCS 20 is adopted as a monitoring and control facility in a sewage treatment plant, and the above configuration is mounted as an application system included therein. FIG. 2 shows the transition of the amount of electric power used and the amount of digested gas generated during a certain day with time. Although the amount at each time greatly depends on the operation status of the sewage treatment plant, it can be said that the amount can be patterned to some extent depending on the season and the day of the week (weekday or holiday). For example, an increase rate (or a decrease rate) of the electric power consumption one hour after a certain time and an increase rate (or a decrease rate) of the digestion gas generation amount at the same time are calculated and calculated by a computer every time, This is used for control. As an example, the following expression shows a basic calculation formula of the power consumption. Pt ₁ = Pt ₀ + ΔP where Pt ₀ : power consumption at the current time (kW) Pt ₁ : power consumption after one hour (kW) ΔP: increase (decrease) power (kW) Is used to set the target value one hour later every 60 minutes, but a straight line approximation between the current value and the target value at 10 minute intervals,
The correction is performed (FIG. 3). On the other hand, the same data collection is performed for the amount of digested gas generated, and the amount F0 (kc) stored in the gas tank is collected.
al), that is, the distribution of electric power supplied by the generator according to the amount of fuel retained by the generator (the amount of electric power (P1 + P) supplied from the digestion gas generator with respect to the amount of electric power P0 (kW) received from the electric power company.
2) (kW) ratio (FIG. 4). [0014] Data on the amount of electric power used and the amount of digested gas generated are collected and categorized according to conditions such as season and day of the week.
Create a model to be used as a setting pattern for each control. FIG. 5 shows an example of the power consumption. The power consumption input to the process controller is usually printed and recorded in a daily report, a monthly report, etc., but is stored here in a dedicated file as setting pattern data. The fetched data is classified and filed according to the corresponding month, day of the week, or whether the corresponding day is a holiday. The designation of a holiday can be set in advance corresponding to a public holiday or a local holiday other than Sunday. In addition, when the operation is suspended or partially stopped due to the construction of facilities in the sewage treatment plant and the maintenance and inspection of the facilities, etc., it is judged that it is not considered to be normal operation and is not suitable for modeling If the date can be specified in advance, and if it is determined that the exception has occurred even after the data has been stored, the date can be specified and transferred to “exception data” within the specified date. In operation, as shown in FIG.
System diagram screen D1 for normal monitoring operation on CRT
Setting screen D2, data collection setting screen D
3, Trend monitoring screen D4, Power purchase-power generation ratio adjustment screen D
5 is displayed, and a setting operation of a function necessary for controlling the number of digestion gas generators is performed. As described above, according to the present invention, the load pattern of the generator and the fluctuation pattern of the amount of digested gas generated are changed according to the season,
The number of generators is calculated based on the day of the week and the time of the day, and the number of generators is calculated based on the classification. The data of each pattern is accumulated and analyzed to make corrections at the next operation. Control accuracy can be improved, and the effectiveness of the auxiliary role of power supply in the treatment plant is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram showing an embodiment of a number control device for sludge digestion gas generators according to the present invention. FIG. 2 is a graph illustrating changes in the amount of electric power used and the amount of digested gas generated during a day. FIG. 3 is a graph showing a correction operation of a target value. FIG. 4 is an explanatory diagram showing a relationship between energy amounts. FIG. 5 is an explanatory diagram of a creation process of a data model and a setting pattern. FIG. 6 is a schematic diagram showing a display example of an operation screen. [Description of Signs] 10 OPS 11P (G) Power consumption (digestion gas generation) data file 12P (G) Power consumption (digestion gas generation) model creation unit 13P (G) Power consumption ( Digestion gas generation amount) Setting pattern creating unit 20 PCS 21 Input / output processing unit 22 Generator operating number determining unit 23 Generator operating unit determining unit

Claims (1)

(57) [Claims] [Claim 1] In a power generation facility in a sewage treatment plant in which a plurality of generators using a sludge digestion gas engine as a prime mover , data on a variation pattern of a sludge digestion gas generation amount is accumulated. Do
Digestion gas generation data file and power consumption data file that stores power consumption data
And data stored in digestion gas generation and power consumption data files.
Calculate the patterns created by the depletion gas generation amount setting pattern creation unit and the power consumption amount setting pattern creation unit, which are created based on the collected data.
Day, determine the generator load pattern by time of day, a generator operation number determination unit which determines the number of operating while the generator load prediction based on this load pattern, the current determined by the determination unit Number of generators in operation
It has a generator operation number determination unit that issues an instruction to increase or decrease the number of generators while comparing , detects the amount of power used and the amount of digested gas generated, and predicts the load on the generator.
When determining the number of generators to be operated , the generated power is corrected based on the fluctuation pattern of the amount of digested gas generated, and used as a calculation factor for the number of generators operated, the load pattern of the generator and the amount of sludge digested gas generated A number control device for sludge digestion gas generators, which accumulates data of fluctuation patterns of the sludge and updates parameters used when calculating the number of generators operated.