CN112685880A - Design method for optimizing scale of combined system overflow storage tank - Google Patents
Design method for optimizing scale of combined system overflow storage tank Download PDFInfo
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Abstract
The invention discloses a design method for optimizing the scale of a combined overflow storage tank, which comprises the steps of building a basic hydraulic model based on Informworks ICM software and using data of a lower mat surface, an inspection well, a pipeline and sewage as a basis, inputting rainfall and evaporation data, defining overflow quantity, outputting a simulation result with the step length of 5 minutes, counting the overflow condition of a discharge port before the storage tank is arranged, sequencing from large to small based on the overflow frequency in the statistical data, primarily determining the scale of the storage tank according to the overflow frequency set by a target, setting the size of the storage tank, the elevation of an overflow weir and RTC emptying logic in the model according to the scale of the storage tank, and outputting the simulation result with the step length of 5 minutes. The invention has the beneficial effects that: by predicting the operation condition of the storage tank after the storage tank is actually built in advance, the scale of the obtained storage tank is more reasonable and scientific, and the method is also documented and recyclable for subsequent water environment treatment.
Description
Technical Field
The invention relates to a design method for optimizing the scale of a combined overflow storage tank, in particular to a design method for optimizing the scale of a combined overflow storage tank, and belongs to the technical field of sewage interception and intake pipe modification of combined old urban areas.
Background
With the increasing emphasis on water environment, the problem of overflow pollution of the intercepting type combined flow system is increasingly highlighted. The intercepting type combined flow drainage system is mostly adopted in old cities at home and abroad, but the interception multiple is small, the overflow frequency is high, and the overflow sewage is directly discharged into a water body to cause serious pollution. It is very important to select a proper mode to modify the drainage system so as to reduce the exogenous pollution of the water body. Many old cities do not have the condition of changing a flow system into a flow system, and the CSO regulation and storage tank can be used as an effective transformation measure.
The countries such as Germany, Japan, America, Australia and the like all use the rainwater storage tank as a main measure for overflow pollution control of the combined drainage system. In German design Specification, the 'merged sewage box culvert rainstorm reduction device pointer' (ATV A128), the volume of a rainwater storage tank is determined according to parameters such as rainfall, ground runoff pollution load, drought flow sewage concentration and the like by taking the load of a water body discharged by a merged system drainage system not more than a split system drainage system as a target. And the cutoff multiple calculation method is adopted in China according to the outdoor drainage standard GB 50014-2006. The method is established on the basis that the rainfall event is uniform rainfall, the running time of the regulation and storage tank is not less than the duration of rainfall with overflow, and the emptying time of the regulation and storage tank is less than the interval of two rainfalls.
In practice, however, it is difficult to satisfy the above assumption. In the actual situation, rainfall is not uniform, each overflow event does not occur independently, and a drainage system is usually complex, does not have gravity flow, and is also provided with a water pump forced drainage system; there are also mixed connection, inflow and infiltration of rain and sewage pipe networks, possibly sediment accumulation, and possibly river tide level. The design scale of the storage regulation pool needs to consider not only the goal of pollution control but also economic and reasonable.
The Infoworks ICM hydraulic model can be used for accurately simulating the influence, and has exact scientific basis for polluted water quality and water quantity.
Therefore, the method is more scientific and reasonable by adopting Infoworks ICM model simulation for assistance and assisting in designing the scale of the storage tank according to the actual running condition of the storage tank.
Disclosure of Invention
The invention aims to provide a design method for optimizing the scale of a combined overflow storage tank, so as to solve the problems in the background technology.
The invention realizes the aim through the following technical scheme, and a design method for optimizing the scale of a combined overflow storage tank comprises the following steps: building a basic hydraulic model based on Infoworks ICM software and using the data of a lower cushion surface, an inspection well, a pipeline and sewage quantity as the basis;
step two: inputting rainfall and evaporation data;
step three: defining the overflow quantity;
step four: outputting a simulation result with the step length of 5 minutes, counting the overflow condition of a discharge port before the regulation and storage tank is set, sorting the overflow frequency from large to small based on the statistical data, and primarily determining the scale of the regulation and storage tank according to the overflow frequency set by a target;
step five: setting the size of the storage tank, the elevation of an overflow weir and RTC emptying logic in the model according to the scale of the storage tank;
step six: outputting a simulation result with the step length of 5 minutes, counting the overflow conditions of the discharge port after the regulation and storage tank is set, sequencing from large to small, comparing the overflow frequency in the statistical data with the overflow frequency set by the target, and if the overflow frequency is not met, continuing to optimize the scale of the regulation and storage tank and operating the model.
Preferably, in the first step, the sewage event is dry season sewage in the sub-water area and sewage amount in a mixed connection with the outer pipe network.
Preferably, in the second step, the rainfall data used is typical year-by-minute or five-minute rainfall data.
Preferably, in the third step, the statistical overflow amount is defined as the sum of the overflow amounts in one hour, and the overflow amount smaller than 50 cubic is ignored.
Preferably, in the fifth step, the RTC emptying logic is to define that the pump is emptied in two hours in a sunny day.
The invention has the beneficial effects that: the operation condition of the storage tank after the actual construction is predicted in advance, the scale of the obtained storage tank is more reasonable and scientific, and the method is also documented and recyclable for subsequent water environment treatment.
Drawings
FIG. 1 is a flow chart of the regulation pool size determination of the present invention;
FIG. 2 is a diagram of an Infoworks ICM hydraulic model set-up of the present invention;
FIG. 3 is an analysis chart of the overflow volume and the overflow frequency before the regulation pool is set;
FIG. 4 is an analysis chart of the overflow volume and the overflow frequency after the regulation pool is set.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, a design method for optimizing the size of a combined overflow storage tank includes: based on Infoworks ICM software, a basic hydraulic model is built on the basis of data of a lower cushion surface, an inspection well, a pipeline and sewage, rainfall and evaporation data are input, overflow amount is defined, a simulation result with the step length of 5 minutes is output, the overflow condition of a discharge port before the setting of a regulation pool is counted, the overflow frequency in the statistical data is based, the overflow condition is sorted from large to small, the scale of the regulation pool is preliminarily determined according to the overflow frequency set by a target, the size of the regulation pool, the elevation of an overflow weir and RTC emptying logic are set in the model according to the scale of the regulation pool, the simulation result with the step length of 5 minutes is output, the overflow condition of the discharge port is counted after the setting of the regulation pool, the overflow condition is sorted from large to small, the overflow frequency in the statistical data and the overflow frequency set by the target are compared, if the overflow frequency in the statistical data and the target does not meet the.
The sewage event is dry season sewage in the subset water area and sewage amount in mixed connection with an external pipe network in the range, the adopted rainfall data is typical rainfall data of one minute or five minutes per year, the statistical overflow amount is defined as the sum of overflow amounts in one hour, the overflow amount smaller than 50 cubic is ignored, and RTC emptying logic is to define that a pump is emptied in two hours under the condition of fine days;
FIG. 2 is a diagram of the Infoworks ICM hydraulic model construction of the present invention, with the shaded emphasis areas being the design areas.
The working principle of the invention is as follows: the method is generally used for the auxiliary optimization of the scale of the CSO regulation pool in old and old urban area reconstruction in a shutoff type combined flow control overflow drainage mode, and is based on current data, Inworks ICM software is adopted to carry out scientific and reasonable simulation on a design area, a specific flow chart is shown in figure 1, and the steps are as follows:
the method comprises the following steps: importing a sub-water collection area, setting parameters of a lower cushion surface, importing pipe networks and pump station data, setting a sewage event according to the dry season sewage flow and the out-of-range pipe network mixed connection flow, dividing drainage subareas according to the actual drainage condition, and corresponding the sub-water collection area to an inspection well to complete the construction of a basic model;
step two: rainfall and evaporation data are input, and when no detailed rainfall data of many years exist, rainfall with the step length of 5 minutes in the typical year can be used as a representative for simulation, or rainfall data with the step length shorter in the typical year can be used as a representative;
step three: defining overflow quantity, counting the overflow quantity after the model operation is finished, and defining the standard of the overflow quantity according to the conditions of items, such as taking the overflow quantity in one continuous hour as an overflow event, or dividing the overflow quantity in a rainfall event after a rainfall field;
step four: the simulation results are output with a step size of 5 minutes. And (4) counting the overflow condition of the discharge port before the regulation and storage tank is set. Sorting from large to small based on overflow frequency in the statistical data, preliminarily determining the scale of the regulating and storing pool according to the overflow frequency set by a target, and taking the 20 th overflow quantity as the control flow to preliminarily serve as the scale of the CSO regulating and storing pool after sorting the overflow quantity from large to small if the overflow frequency is 100 and the overflow frequency set by the target is controlled to be 80%;
step five: use preliminary definite regulation pond scale as the basis, through setting for the effective volume of regulation pond size and overflow weir elevation control regulation pond in the model, set up RTC evacuation logic simultaneously, the evacuation logic is: when the rainfall occurs, the pump stops working, and when the rainfall occurs, the pump empties the storage tank within a set time (the time is set according to project conditions);
step six: the simulation results are output with a step size of 5 minutes. And after the regulation pool is set, the outflow condition of the overflow weir of the regulation pool is counted. Sorting from large to small, comparing the overflow frequency in the statistical data with the overflow frequency set by the target, if the overflow frequency is controlled to be more than 80% beyond the target set in the fourth step, properly adjusting the scale of the regulating and storing pool until the overflow frequency is near the target value; if not, continuing to optimize the scale of the regulation and storage tank and operating the model until the overflow frequency reaches the target.
The invention is further explained and illustrated by taking the CSO regulation pool design as an example for the combined overflow control of the old city and the old city. The design process is as follows:
firstly, importing a sub-water collection area (comprising an information roof, a green land, a hardened surface and a water body of the lower mat surface), setting parameters (runoff coefficient, Horton coefficient, soil permeability coefficient and the like) of the lower mat surface, importing a pipe network (the elevation of the upper and lower bottoms of the pipe network), an inspection well (the elevation of the bottom) and pump station data (the operation rule of a pump station), setting a sewage event according to the flow rate of sewage in dry seasons and the mixed sewage quantity outside the range, dividing drainage subareas according to the actual drainage condition, and corresponding the sub-water collection area and the inspection well to complete the construction of a basic model;
secondly, inputting rainfall with the step length of 5 minutes in the typical year as rainfall events and evaporation data corresponding to the typical year;
thirdly, defining the overflow quantity, and taking the continuous overflow quantity in one hour as a primary overflow event;
and fourthly, outputting a simulation result with the step length of 5 minutes. Sequencing the overflow quantity of the discharge port from large to small, preliminarily determining the scale of the regulation and storage tank according to the overflow frequency set by the target, and removing the overflow quantity smaller than 30m according to the simulation result3If the overflow event is the overflow event, the overflow frequency is 80 times, the target is set to be that the overflow frequency is controlled to be 80%, after the overflow quantity is sequenced from large to small, the 16 th overflow quantity is taken as the control flow and is primarily taken as the scale of the CSO regulation and storage pool;
fifthly, adjusting the effective volume of the storage tank to 5000m according to the CSO3Setting the land occupation area of a regulation and storage pool in the model to be 1000m2And the elevation of the overflow weir is 5m, and RTC emptying logic is set at the same time, wherein the emptying logic is as follows: when the rainfall occurs, the pump stops working, and after the rainfall occurs, the pump starts to operate and is emptied within two time periods;
and sixthly, outputting a simulation result with the step length of 5 minutes. Sequencing from large to small, and removing overflow quantity of less than 30m from simulation result3Comparing the overflow frequency in the statistical data with the overflow frequency set by the target, the overflow frequency is 80%. Therefore 5000m3The method can be used as a basis for the scale setting of the CSO regulation pool in the old city area in an auxiliary manner, so that the design is more scientific and reasonable.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A design method for optimizing the scale of a combined overflow storage tank is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: building a basic hydraulic model based on Infoworks ICM software and using the data of a lower cushion surface, an inspection well, a pipeline and sewage quantity as the basis;
step two: inputting rainfall and evaporation data;
step three: defining the overflow quantity;
step four: outputting a simulation result with the step length of 5 minutes, counting the overflow condition of a discharge port before the regulation and storage tank is set, sorting the overflow frequency from large to small based on the statistical data, and primarily determining the scale of the regulation and storage tank according to the overflow frequency set by a target;
step five: setting the size of the storage tank, the elevation of an overflow weir and RTC emptying logic in the model according to the scale of the storage tank;
step six: outputting a simulation result with the step length of 5 minutes, counting the overflow conditions of the discharge port after the regulation and storage tank is set, sequencing from large to small, comparing the overflow frequency in the statistical data with the overflow frequency set by the target, and if the overflow frequency is not met, continuing to optimize the scale of the regulation and storage tank and operating the model.
2. The design method for optimizing the scale of the combined overflow storage tank as claimed in claim 1, wherein the design method comprises the following steps: in the first step, the sewage event is dry season sewage in the sub-set water area and sewage amount in mixed connection of the outer pipe network in the range.
3. The design method for optimizing the scale of the combined overflow storage tank as claimed in claim 1, wherein the design method comprises the following steps: in the second step, the rainfall data adopted is typical year rainfall data of minute by minute or five minutes.
4. The design method for optimizing the scale of the combined overflow storage tank as claimed in claim 1, wherein the design method comprises the following steps: and step three, defining the statistical overflow quantity as the sum of the overflow quantities in one hour, and neglecting the overflow quantity less than 50 cubic meters.
5. The design method for optimizing the scale of the combined overflow storage tank as claimed in claim 1, wherein the design method comprises the following steps: and step five, RTC emptying logic is to define that the pump is emptied in two hours under the condition of sunny days.
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Cited By (3)
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| CN113502896A (en) * | 2021-07-27 | 2021-10-15 | 福州城建设计研究院有限公司 | Double-gate mixed-flow rainwater storage and interception device, system and method based on water quality monitoring |
| CN114607017A (en) * | 2022-03-17 | 2022-06-10 | 中电建华东勘测设计研究院(郑州)有限公司 | Overflow sewage treatment structure suitable for combined system and design and operation method thereof |
| CN115907429A (en) * | 2022-12-28 | 2023-04-04 | 清华大学 | PSO algorithm-based combined overflow optimization control method and device |
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| CN115907429B (en) * | 2022-12-28 | 2023-08-25 | 清华大学 | PSO algorithm-based combined overflow optimization control method and device |
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Application publication date: 20210420 |