CN115619126A - Sponge power plant planning and designing method and system - Google Patents
Sponge power plant planning and designing method and system Download PDFInfo
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Abstract
The invention discloses a planning and designing method and a system for a sponge power plant, which comprises the following steps: determining an adjustment index and a control target; the regulation indexes comprise a sunken green land rate, a permeable pavement rate, a green roof rate and a runoff storage regulation rate, and the control targets comprise a runoff total amount and a runoff pollution removal rate; determining a site facility layout scheme according to a preset sponge power plant application mode and implementation measures; for each site facility layout scheme, determining the value of each type of regulation index according to the site proportion occupied by the facility, and determining the total runoff quantity and the runoff pollution removal rate according to the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area; and evaluating the total runoff quantity and the runoff pollution removal rate of each site facility layout scheme according to the control target design value to screen and obtain the optimal site facility layout scheme. And the method is combined with rainwater planning, and the utilization of rainwater resources is considered, so that the construction target of low-influence development is achieved.
Description
Technical Field
The invention relates to the technical field of sponge power plant development, in particular to a sponge power plant planning and designing method and system.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The sponge city is based on a low-influence development and construction mode, and supported by a flood control and drainage system, so that the natural storage, permeation, purification and slow release effects of greenbelts, soil, river and lake water systems and the like on the rainwater runoff are fully exerted, the emission reduction, dispersion and accumulation, slow release and reasonable utilization of the urban rainwater runoff sources are realized, the city can slow down or reduce natural disasters and environmental change influences like a sponge, and the water ecological environment is protected and improved.
The theory and application research about the sponge city development concept mainly focuses on community-level business areas, residential areas and public space levels, while the research on the scale level of the power plant is less, and the research on the practice level is only applied to green land planning and landscape planning of individual power plants, and the combination degree of the rain water system planning is lower. And the conventional power plant rainwater system only takes the drainage as the design purpose and does not consider the utilization of rainwater resources.
The existing power plant rainwater system has defects in planning, management and other aspects, for example, the application of the power plant to the sponge city theory is limited to the use of a single implementation measure, and systematic performance, application requirements, application effects and quantitative measurement of the sponge city theory are ignored; the use of the measures lacks data support, application analysis is not carried out, effective connection between the measures is lacked, actual functions which the measures should exert are influenced, and even normal use of other power plant facilities is influenced. At present, no comprehensive system and method can well solve the problem of low influence development of the sponge power plant.
Disclosure of Invention
In order to solve the problems, the invention provides a planning and designing method and a system for a sponge power plant, which take the total runoff amount and the runoff pollution removal rate as control targets, take the submerged greenbelt rate, the permeable pavement rate, the green roof rate and the runoff storage rate as adjustment indexes, plan an optimal sponge power plant site facility layout scheme, combine with rainwater planning, consider the utilization of rainwater resources, and achieve the construction target of low-impact development.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a planning and designing method for a sponge power plant, which comprises the following steps:
determining an adjustment index and a control target; the regulation indexes comprise a sunken greenbelt rate, a permeable pavement rate, a green roof rate and a runoff storage regulation rate, and the control targets comprise a runoff total amount and a runoff pollution removal rate;
determining a site facility layout scheme according to a preset sponge power plant application mode and implementation measures;
for each site facility layout scheme, determining the value of each type of regulation index according to the site proportion occupied by the facility, and determining the total runoff quantity and the runoff pollution removal rate according to the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area;
and evaluating the total runoff quantity and the runoff pollution removal rate of each site facility layout scheme according to the control target design value to screen and obtain the optimal site facility layout scheme.
As an alternative embodiment, the control objective further comprises a runoff peak;
the total runoff amount comprises rainwater resource utilization rate and outward runoff amount;
the runoff pollution removal rate comprises an annual SS total removal rate.
As an alternative embodiment, the annual SS total removal rate is obtained by averaging the annual SS total removal rates of different zones with the total runoff.
As an alternative embodiment, the outward runoff volume is obtained according to a designed rainfall thickness, a comprehensive rainfall runoff coefficient and a catchment area.
As an alternative embodiment, the rainwater resource utilization rate is reflected by the runoff storage regulation amount, and the runoff storage regulation amount is obtained according to the designed rainfall thickness, the runoff storage regulation rate and the catchment area.
As an alternative embodiment, the comprehensive runoff coefficient is obtained by weighted averaging the value of each type of adjustment index and the rainfall runoff coefficient of the corresponding region.
As an alternative embodiment, the sinking green land rate, the water permeable pavement rate and the green roof rate are obtained according to the proportion of the total area of the field occupied by the facilities in the field facility layout scheme.
As an alternative embodiment, the volume of the rainwater storage facility is determined according to the proportion of the total area of the site occupied by the facility, and the runoff storage regulation rate is obtained according to the proportion of the volume of the rainwater storage facility to the total area of the site.
As an alternative embodiment, the sponge power plant application modes comprise a water supplementing mode, a utilization mode and an adjusting mode.
As alternative embodiments, the implementation measures include rainwater infiltration measures, rainwater transportation measures, rainwater storage measures, rainwater conditioning measures, rainwater storage measures, and rainwater purification measures.
In a second aspect, the present invention provides a planning and designing system for a sponge power plant, including:
an indicator and target determination module configured to determine an adjustment indicator and a control target; the regulation indexes comprise a sunken green land rate, a permeable pavement rate, a green roof rate and a runoff storage regulation rate, and the control targets comprise a runoff total amount and a runoff pollution removal rate;
the facility layout determining module is configured to determine a site facility layout scheme according to a preset sponge power plant application mode and implementation measures;
the scheme evaluation module is configured to determine the value of each type of regulation index according to the proportion of the facility in the field and determine the total runoff amount and the runoff pollution removal rate according to the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area for each type of field facility layout scheme;
and the scheme screening module is configured to evaluate the total runoff amount and the runoff pollution removal rate of each site facility layout scheme according to the control target design value so as to screen an optimal site facility layout scheme.
In a third aspect, the present invention provides an electronic device comprising a memory and a processor, and computer instructions stored in the memory and executed on the processor, wherein when the computer instructions are executed by the processor, the method of the first aspect is performed.
In a fourth aspect, the present invention provides a computer readable storage medium for storing computer instructions which, when executed by a processor, perform the method of the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a planning and designing method and a system for a sponge power plant, which are used for planning or designing an optimal sponge power plant site facility layout scheme by taking the total runoff amount and the runoff pollution removal rate as control targets and taking the submerged greenbelt rate, the permeable pavement rate, the green roof rate and the runoff storage regulation rate as adjustment indexes, are combined with rainwater system planning, take the utilization of rainwater resources into consideration, reduce the influence of rainwater planning on the sponge power plant, reduce the rainwater flood peak flow, achieve the construction target of low-influence development, and improve the design efficiency and the scientificity of sponge power plant construction.
The invention provides a sponge power plant planning and designing method and system, which are used for integrating the theory of sponge cities with power plant construction, comprehensively constructing a sponge power plant application system suitable for power plant site construction, breaking through the restriction of the existing single rainwater discharge pipe network mode, organically combining a source control measure, a process control measure, a terminal treatment measure and a rainwater pipe network system, and solving the problems of rainwater waste and incapability of recycling rainwater resources of a power plant.
The invention provides a planning and designing method and a planning and designing system for a sponge power plant, which are suitable for the technical field of low-impact development of industrial plants, particularly power plant plants, and are used for formulating sponge power plant measures and corresponding target control measures with pertinence, realizing emission reduction of rainwater runoff sources, dispersion and accumulation, slow release and reasonable utilization of the power plants, slowing down or reducing natural disasters and environmental change influences, protecting and improving water ecological environment and improving the economical efficiency of a comprehensive energy system.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a flow chart of planning and designing a sponge power plant provided in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of adjustment index determination provided in embodiment 1 of the present invention;
FIG. 3 is a diagram of a designed rainfall duration provided in example 1 of the present invention;
fig. 4 is a schematic view of peak flow of a flood without using a green space system according to embodiment 1 of the present invention;
fig. 5 is a schematic view of peak flow rate using a green space system according to embodiment 1 of the present invention;
fig. 6 is a schematic view of peak flow rate of a flood using a rainwater recharging facility according to embodiment 1 of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
The embodiment provides a sponge power plant low-impact planning and designing method based on sponge city theory, as shown in fig. 1, including:
determining an adjustment index and a control target; the regulation indexes comprise a sunken greenbelt rate, a permeable pavement rate, a green roof rate and a runoff storage regulation rate, and the control targets comprise a runoff total amount and a runoff pollution removal rate;
determining a site facility layout scheme according to a preset sponge power plant application mode and implementation measures;
for each site facility layout scheme, determining the value of each type of regulation index according to the site proportion occupied by the facility, and determining the total runoff quantity and the runoff pollution removal rate according to the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area;
and evaluating the total runoff quantity and the runoff pollution removal rate of each site facility layout scheme according to the control target design value to screen and obtain the optimal site facility layout scheme.
In the embodiment, the adjustment index and the control target are determined according to site conditions and topographic features, the application mode and implementation measures of the sponge power plant are preset by combining project features, and the site facility layout scheme is compared and selected according to the site facility layout scheme and the established adjustment index and control target, so that the site facility layout scheme suitable for projects is selected preferably, a low-impact development scheme of the sponge power plant is formed, and economic, energy efficiency and environmental protection benefit maximization is realized.
In the embodiment, a control target and an adjustment index suitable for the sponge power plant are established;
wherein the total runoff amount comprises rainwater resource utilization rate and outward runoff amount;
in the planning and construction process of the sponge power plant, the total amount of the annual runoff is decomposed into unit area control volume, and the unit area control volume is used as a comprehensive control index to implement a total runoff amount control target; namely, the control way of the total runoff amount comprises the outward runoff amount of rainwater infiltration emission reduction and the rainwater resource utilization rate of direct collection, storage and utilization.
The runoff contamination removal rate; in runoff pollutants of a power plant, SS and other pollutant indexes have certain correlation, so that the SS is used as a runoff pollutant control index, and the annual SS total removal rate of a rainwater system developed by a sponge power plant can generally reach more than 40%;
annual SS total removal rate = annual runoff total control rate × average removal rate of low-impact development facilities to SS; namely the annual SS total removal rate of the sponge power plant can be obtained through the average value of the annual SS total removal rates of different regions/plots and the annual runoff total;
the total runoff amount is obtained according to the annual average rainfall, the comprehensive rainfall runoff coefficient, the catchment area and the runoff storage regulation rate.
In this embodiment, the control target may further include a runoff peak.
In order to ensure the operation safety of the sponge power plant, in the construction area of development facilities of the sponge power plant, design parameters such as the design reproduction period, runoff coefficients and the like of urban rainwater pipe ducts and pump stations are executed according to relevant standards in relevant outdoor drainage design specifications. Meanwhile, the sponge power plant development rainwater system is connected with an urban rainwater pipe system and an overproof rainwater runoff discharge system, and a whole-process rainwater control and management system from a source to a tail end is established.
In this embodiment, the achievement of the development control target of the sponge power plant depends on the adjustment index, and as shown in fig. 2, the size of the adjustment index is reasonably selected according to the building density of each development land, the proportion of facilities such as greenbelts, squares, parking lots, roads and the like in the planning area, so as to achieve the control target to be achieved.
The adjustment indicators include: the method comprises the following steps of (1) sinking type green land rate, water permeable pavement rate, green roof rate and runoff storage regulation rate;
when the planning design of the sponge power plant is carried out, the total area of the site occupied by the facilities is determined, and then the sinking type greenbelt rate, the permeable pavement rate and the green roof rate can be obtained according to the proportion of the facilities in each site facility layout scheme to the total area of the site after the site facility layout schemes are determined;
meanwhile, the volume of the rainwater storage facility is determined according to the proportion of the total area of the field occupied by some facilities, for example, the volume of the rainwater storage facility is determined according to the amount of miscellaneous water (the rainwater can be recycled for production water) and the like for green land irrigation, road sprinkling, ground washing and the like, and then the runoff storage rate is obtained according to the proportion of the volume of the rainwater storage facility to the total area of the field.
In the embodiment, the application mode and implementation measures of the sponge power plant are preset to determine the layout scheme of facilities in the site, so that the rainwater is recycled, and the damage of natural hydrologic cycle is reduced. Sponge power plant measures are applied in a rainwater system, and small-scale and distributed technical measures are adopted to retain, purify and recycle rainwater, so that the source management of the rainwater is realized.
Specifically, the method comprises the following steps:
(1) The construction land of the sponge power plant facility is selected mainly from nature and assisted by artificial facilities.
(2) The sponge power plant application modes comprise a water supplementing mode, a utilization mode and an adjusting mode, and are respectively specific to a drought area, a semi-humid area and a humid area;
wherein, 1) a water replenishing mode in a drought area; in arid areas where the annual evaporation capacity is greater than the rainfall, the sponge power plant implementation measures mainly include permeable pavement, penetration measures such as a concave greenbelt, a roof garden and a rainwater garden, and rainwater transfer measures, and rainwater is infiltrated as much as possible without advocating measures mainly including rainwater storage and regulation.
2) A semi-humid area utilization mode; in semi-humid areas, rainfall is abundant, underground water is abundant, rainwater needs to be stored on the basis of the control of rainwater runoff except for an infiltration means, and rainwater utilization is increased on the basis of infiltration.
3) A wet area regulation mode; rainfall in wet areas is large in rainfall amount and high in rainfall intensity, and the optimal management effect on the rainwater is difficult to achieve by adopting rainwater infiltration and storage facilities alone. Therefore, a certain adjusting measure is adopted, an adjusting mode of 'rainwater pipe network + permeation measure + storage measure + transfer measure + purification measure + adjusting measure/storage measure' is constructed, and the peak flow entering the rainwater pipe network is reasonably reduced.
In the embodiment, the sponge power plant implementation measures are selected from combined sponge power plant implementation measures which are modular, integrated and emphasized on the basis of determining the development mode of the sponge power plant; the implementation measures of the sponge power plant comprise a rainwater infiltration measure, a rainwater transferring measure, a rainwater storage measure, a rainwater adjusting measure, a rainwater storage measure and a rainwater purification measure.
In the embodiment, the sponge power plant application mode and the implementation measure layout; the sponge power plant measures restore the natural surface drainage function. Therefore, sponge power plant development measures should be combined with various green belts and landscape belts as much as possible, and the arrangement of the green landscape belts is required to be beneficial to receiving, regulation, infiltration and transportation of rainwater so as to ensure that rainwater runoff can be smoothly and orderly consumed and discharged.
Wherein, 1) rain water penetration measures: the function is characterized in that rainwater infiltrates and can supplement underground water. The method specifically comprises the steps of water permeable pavement, surface layer infiltration of the concave green land and deep layer infiltration measures of roof gardens, rainwater gardens, ecological tree pools and the like.
2) And (4) rainwater transferring measures: the method comprises the following steps: the vegetation shallow trench has the transportation function and also has certain functions of rainwater infiltration and purification; the filtering side ditch has the functions of transportation and certain rainwater purification and storage.
3) Rainwater storage measures: collected rainwater is temporarily stored, and the rainwater can be used in each functional area of a power plant after being purified, and meanwhile, the rainwater has a certain peak delaying effect.
4) Rain water regulation measures: the temporary storage of rainwater runoff does not reduce the total amount of runoff discharged, and the main function of the temporary storage is to reduce peak flow.
5) Rainwater regulation and storage measures: the storage regulation measure is a measure with rainwater storage and regulation functions.
6) Rain water purification measures: the initial runoff is purified, and the water pollution is reduced.
In this embodiment, a single low-impact development measure often has multiple functions, and therefore, when a sponge power plant development measure is selected, the economic cost, the landscape value, the main functions and the like of the sponge power plant development measure are comprehensively considered for technical comparison and selection. The economic comparison mainly comprises the following steps: capital construction costs, maintenance costs, and the like. In addition, the maintenance and management of the sponge power plant mainly carries out regular pruning on the vegetation of the sponge power plant so as to ensure the normal play of the functions of the sponge power plant.
The sponge power plant is respectively combined and distributed with facilities according to a 'clean' production area, a 'dirty' production area, a factory front area (including a green space square), a power plant water system and a power plant road. The overall scheme design is carried out by combining the power plant general plane plan, the power plant flood prevention and drainage plan and the power plant vertical design, and the construction target and index of the sponge power plant factory scheme are implemented according to the principles of safety priority, adaptability to local conditions, economy, effectiveness, convenience, easiness in implementation and convenience in maintenance. The overall scheme design is the basis of the scheme design of the sponge power plant, and the main contents comprise division of catchment subareas, planar layout of sponge facilities and vertical design of the sponge facilities. The design key points of the sponge power plant comprise control of non-point source pollution, consideration of landscape requirements, promotion of rainwater recycling, consideration of laying of other pipelines and the like.
In the embodiment, after a plurality of site facility layout schemes are determined, the facility layout schemes are evaluated according to the runoff total amount and the runoff pollution removal rate of each site facility layout scheme;
specifically, the method comprises the following steps:
the minimum limit and the maximum limit of the runoff total amount control rate alpha are in the following categories: a region I (alpha is more than or equal to 85 percent and less than or equal to 90 percent), a region II (alpha is more than or equal to 80 percent and less than or equal to 85 percent), a region III (alpha is more than or equal to 75 percent and less than or equal to 85 percent), a region IV (alpha is more than or equal to 70 percent and less than or equal to 85 percent) and a region V (alpha is more than or equal to 60 percent and less than or equal to 85 percent); the design value of the total runoff amount can be selected in turn;
calculating the total runoff quantity, including calculating the utilization rate of rainwater resources and the outward runoff quantity;
wherein, the core of sponge power plant development theory is for carrying out the integrated management to the rainwater through multiple way, and the most perfect management mode is exactly that the external discharge runoff that so can make after the construction nearly equals the rainwater runoff that the present situation place discharged, and its computational formula is:
W＝10ψhF
wherein W is the efflux of radial, m 3 (ii) a Psi is the comprehensive rainfall runoff coefficient; h is the designed rainfall thickness, mm; f is the catchment area, hm 2 。
And the comprehensive runoff coefficient is obtained by weighted averaging the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area.
Obtain the runoff volume of storing according to the runoff rate of storing, reflect rainwater resource utilization promptly, specifically do:
W Q ＝10RhF
wherein, W Q The runoff storage regulation amount is shown, and R is the runoff storage regulation rate.
In the same planning area, after the design reproduction period of the planning is determined, the size of the catchment area of the planning area and the size of the design rainfall thickness are determined. Therefore, the aim of controlling the outward discharge runoff can be achieved only by controlling the rainfall runoff coefficient, and the sponge power plant development measures can well change the property of the underlying surface of the development plot, reduce the rainfall runoff coefficient of the plot and enable the outward discharge runoff of rainfall after the sponge power plant development measures are applied to be close to the outward discharge capacity of the plot when the plot is not developed.
(1) Determining rainfall runoff coefficients; the comprehensive runoff coefficient is obtained by weighted average of the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area.
(2) The design rainfall thickness h is:
h＝i·t
in the formula: i is rainfall intensity, mm/min; and t is the duration of rainfall, namely the period of continuous rainfall, and min.
According to the past application experience, a mature Chicago storm process line model is selected for rainfall simulation. According to a design rainstorm intensity formula:
chicago rain pattern is expressed as:
before the rain peak:
after the rain peak:
in the formula: q is the average rainstorm intensity, L/(s · hm 2); i is the average rainfall intensity (mm/min) over the rainfall duration t; q [ L/(s. Hm 2)]=166.7i (mm/min) t rainfall duration (min); t is t a 、t b Time before and after the rain peak (min); i all right angle a 、i b Instantaneous rainfall intensity (mm/min) before and after the rain peak; a. and b and c are rainstorm related parameters of the research area.
According to the research on the prior application data, the r value is not very large and is generally between 0.3 and 0.5T, and the selection of the rainfall duration is combined with the drainage design duration of a rainwater pipe network system and is set as 120min, and the time interval is 1min.
In practical design, the design rainfall thickness is often determined by the recurrence period P, and comprehensive consideration needs to be given to the selection of the recurrence period. The designed rainfall thickness of the low-impact development measures is not too large, and is determined by combining a local rainstorm intensity formula and economic conditions. The specific method comprises the following steps: the method comprises the steps of firstly calculating rainfall thicknesses of different reappearance periods such as 1a, 2a, 3a, 4a and 5a by utilizing a Chicago rainstorm process line model according to an rainstorm intensity formula of a planning region, then referring to a rainfall type table, taking the corresponding reappearance period and the designed rainfall thickness below heavy rainstorm as a selection range, and finally determining the final designed rainfall thickness as a low-influence development measure scale calculation basis by combining the designed reappearance period of a rainwater pipe network system of the planning region.
The runoff pollution removal rate is aimed at; related documents are consulted or runoff pollution status information of the area is obtained from a local detection mechanism and is used as runoff pollution source intensity data; and calculating the runoff pollution reduction rate of the whole industrial plant area and the pollutant concentration of a rainwater runoff discharge port according to the design load of the sponge power plant facilities of different types, the corresponding pollutant removal rate, the catchment area of the sponge power plant facilities and a local storm intensity formula.
In this embodiment, carry out model simulation analysis to sponge power plant site facility layout scheme, include:
1) Hydrologic effect simulation analysis; models such as SWMM, MUSIC, XP drainage and the like are used, a sponge power plant site facility layout scheme is used as a basis, hydrological effects before and after implementation of a modeling analysis scheme are provided, and analysis results under normal rainfall and extreme rainfall events, including runoff peak reduction and runoff peak delay time, are given.
2) Simulating and analyzing the water quality effect; models such as SWMM, MUSIC, XP drainage and the like are used, a sponge power plant site facility layout scheme is used as a basis, obtained pollution source intensity data, removal rates of different types of sponge power plant facilities and catchment areas corresponding to the sponge power plant facilities are used as input parameters, water quality effects before and after implementation of the analysis scheme are analyzed, and removal effects of characteristic pollutants such as SS, COD, NH3-N, TN, TP and the like and water quality of a rainwater discharge port are analyzed.
The embodiment fuses the theory of sponge city and the construction of a power plant, follows the technical principle of planning, leading, safety being heavy, ecological priority, adapting to local conditions and overall construction, analyzes the applicability of the sponge power plant in the power plant based on the characteristics of the construction of the sponge power plant, summarizes and summarizes the sponge power plant construction scheme adapting to local conditions, comprehensively constructs a sponge power plant application system suitable for the construction of a power plant area, analyzes the construction requirements of the sponge power plant in the aspects of water ecology, water resource, water environment, water safety and the like of the current situation of the power plant area, combines the local city planning requirements, puts forward the planning construction target of the sponge power plant according to local conditions, decomposes the sponge power plant application system into various links such as land space function layout, flood prevention, waterlogging drainage, vertical direction, water supply, drainage, roads, greening and the like, breaks through the restriction of the existing single rainwater discharge pipe network mode, organically combines source control measures, process control measures, terminal treatment measures and rainwater pipe network systems, and solves the problems that rainwater is wasted and rainwater resources of the power plant cannot be reused.
The embodiment is suitable for the technical field of low-influence development of industrial plants, particularly power plant plants. Based on project characteristics, sponge power plant measures and corresponding target control measures with pertinence are formulated, a power plant low-influence development design method based on a sponge city theory is formed, power plant rainwater runoff source emission reduction, dispersion and accumulation, slow release and slow discharge and reasonable utilization are achieved, natural disasters and environmental change influences are slowed down or reduced, water ecological environment is protected and improved, and the economical efficiency of a comprehensive energy system is improved.
Experimental verification
The rainstorm intensity formula is:
in the formula: i is the design rainstorm intensity (mm/min); a. The 1 Is a rain condition frequency variable; p is a design recurrence period; c is a calculation parameter; t is rainfall duration (min); b is a local frequency variable; n is a regional index; each parameter is n =0.66, b =9, a 1 =1930, C =0.58, calculated as a maximum rainfall of 295mm.
Substituting the rainstorm intensity formula parameters into Chicago rainstorm formula (the peak ratio r is 0.4), and calculating to obtain 24-hour rainfall process lines of 100-year-one, 10-year-one and 2-year-one, as shown in FIG. 3, wherein the gradual rainfall is shown in Table 1;
TABLE 1 rainfall in time
Maximum rainfall was calculated for 10min, 1 hour, 6 hours and 24 hours from the Chicago storm formula calculation, and then storm attenuation indices n1=0.477, n2=0.619, n3=0.652 were calculated from the 4 periods of storm rainfall.
The flood peak flow calculation formula of the overall confluence is as follows:
in the formula: q m Is the peak flow (m) 3 S); f is the basin area (km) 2 ) (ii) a n is a rainstorm attenuation index; s is the rainfall (mm/min); τ is the total confluence time (min); c is runoff coefficient; k is a comprehensive confluence time parameter; mu is stable infiltration rate (mm/min); l is the river length (km); j is a unit of c The gradient (mill) of the main river channel; n is a radical of hydrogen c The river confluence roughness is obtained.
The peak flow calculation formula of partial confluence is as follows: calculating the peak flow and the convergence time according to the overall convergence formula, and determining if tau>t c And if the flow rate is equal to the flow rate of the current flowing, correcting the flow rate and the flow time:
Q' m ＝β 2/3 Q m
τ'＝τβ 1/3
β＝t c /τ
the flood peak flow formula of the overall confluence of the sloping field is as follows:
in the formula: q is peak flow (m) 3 /s)；τ 0 The total confluence time (min); k 0 Is a comprehensive convergence time parameter; l is 0 Slope length (km); j. the design is a square 0 Slope gradient (‰); n is a radical of 0 The roughness of the sloping field confluence.
The biggest difference between hydrologic calculation with and without LID control is:
(1) Roughness ratio: if LID facilities such as rainwater recharge facilities, grasslands, sunken greenbelt systems and the like exist, the blocking effect on water flow is increased, the confluence time is prolonged, and the peak flow is reduced; according to the related research, the grassland roughness can reach 0.06, while the concrete roughness can reach 0.015;
(2) The stable infiltration rate, the concrete ground infiltration rate is 0, and the grass, the concave greenbelt system is started to increase the infiltration rate, which is calculated according to 15 mm/h.
(3) The rainwater recharging facility has two functions: (1) increasing the stable infiltration rate, wherein the permeability coefficient of the foundation soil is 324mm/h according to 2 groups of water pumping tests carried out on site; (2) the recharging facility is equivalent to a small reservoir with a space, and can play a role in eliminating peaks.
13 rainwater recharging facilities are arranged, each volume is 41.076m3, and the total volume is 533.988m3. Firstly, calculating the peak flow when rainwater recharge facilities, grasslands and a concave greenbelt system are not adopted, and calculating the drainage basin area by adopting the actual area of a power plant to be 2.16km 2 The length of the pipe canal is 9km according to the actual value (only the longest passage is considered), the gradient is 0.001 according to the actual value, 0.015 of the concrete is selected as the roughness, and the stable infiltration rate is 0.12mm/min, so that the peak flows at the outlet of 100-year-first meeting, 10-year-first meeting, 5-year-first meeting and 2-year-first meeting are respectively 17.2m3/s,9.17m3/s,6.03m3/s (close to 6.05m3/s calculated by water conservancy project) and 2.15m3/s, and the flow process line is shown as figure 4.
Then, the peak flow rate after the grassland and the concave greenbelt system are adopted for calculation, and the drainage basin area is calculated by adopting the actual area of the power plant and is 2.16km 2 The length of the pipe duct is 9km according to an actual value, the gradient is 0.001 according to the actual value, the roughness and the stable infiltration rate are added according to an area ratio, the roughness is 0.03, and the stable infiltration rate is 0.17mm/min; the calculated peak flows at the outlet of the 100-year-one meeting, the 10-year-one meeting, the 5-year-one meeting and the 2-year-one meeting are respectively 5.16m3/s,0.644m3/s, 0.467m3/s and 0.286m3/s, and the flow process lines are shown in FIG. 5.
Finally, the function of the rainwater recharging facilities is adopted for calculation, and the rainwater recharging facilities are all positioned at the outlet positions, so that the flow rate of the outlet is reduced by 0.01m3/s, and on the other hand, the outlet flow rate is also reduced in the initial volume of rainwater, but the rainwater is only limited to the initial volume, and the regulation function is not realized after the volume is full. The flow process line is shown in fig. 6.
After measures such as greenbelt and rainwater recharging facilities are used, the drainage of the power plant is obviously reduced, and the reduction percentages of flood peak flow of 100-year-first, 10-year-first, 5-year-first and 2-year-first are respectively as follows: 87%,92%,93% and 70%. The total flood reduction percentage is respectively as follows: 89%,93%,94% and 70%.
Example 2
The embodiment provides a planning and designing system of sponge power plant, includes:
an indicator and target determination module configured to determine an adjustment indicator and a control target; the regulation indexes comprise a sunken greenbelt rate, a permeable pavement rate, a green roof rate and a runoff storage regulation rate, and the control targets comprise a runoff total amount and a runoff pollution removal rate;
the facility layout determining module is configured to determine a site facility layout scheme according to a preset sponge power plant application mode and implementation measures;
the scheme evaluation module is configured to determine the value of each type of regulation index according to the proportion of the facility in the field and determine the total runoff amount and the runoff pollution removal rate according to the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area for each type of field facility layout scheme;
and the scheme screening module is configured to evaluate the total runoff amount and the runoff pollution removal rate of each site facility layout scheme according to the control target design value so as to screen an optimal site facility layout scheme.
It should be noted that the modules correspond to the steps described in embodiment 1, and the modules are the same as the corresponding steps in the implementation examples and application scenarios, but are not limited to the disclosure in embodiment 1. It should be noted that the modules described above as part of a system may be implemented in a computer system such as a set of computer executable instructions.
In further embodiments, there is also provided:
an electronic device comprising a memory and a processor and computer instructions stored on the memory and executed on the processor, the computer instructions when executed by the processor performing the method of embodiment 1. For brevity, no further description is provided herein.
It should be understood that in this embodiment, the processor may be a central processing unit CPU, and the processor may also be other general purpose processor, a digital signal processor DSP, an application specific integrated circuit ASIC, an off-the-shelf programmable gate array FPGA or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory may include both read-only memory and random access memory and may provide instructions and data to the processor, and a portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information.
A computer readable storage medium storing computer instructions which, when executed by a processor, perform the method described in embodiment 1.
The method in embodiment 1 may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, among other storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and combines hardware thereof to complete the steps of the method. To avoid repetition, it is not described in detail here.
Those of ordinary skill in the art will appreciate that the various illustrative elements, i.e., algorithm steps, described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. A planning and designing method for a sponge power plant is characterized by comprising the following steps:
determining an adjustment index and a control target; the regulation indexes comprise a sunken green land rate, a permeable pavement rate, a green roof rate and a runoff storage regulation rate, and the control targets comprise a runoff total amount and a runoff pollution removal rate;
determining a site facility layout scheme according to a preset sponge power plant application mode and implementation measures;
for each site facility layout scheme, determining the value of each type of regulation index according to the site proportion occupied by the facility, and determining the total runoff quantity and the runoff pollution removal rate according to the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area;
and evaluating the total runoff quantity and the runoff pollution removal rate of each site facility layout scheme according to the control target design value to screen and obtain the optimal site facility layout scheme.
2. The sponge power plant planning and design method of claim 1, wherein,
the control target further comprises a runoff peak;
the total runoff quantity comprises rainwater resource utilization rate and outward runoff quantity;
the runoff pollution removal rate comprises an annual SS total removal rate.
3. The sponge power plant planning and design method of claim 2, wherein,
the annual SS total removal rate is obtained through the average value of the annual SS total removal rates of different areas and the runoff total.
4. The sponge power plant planning and design method of claim 2, wherein,
the outward runoff is obtained according to the designed rainfall thickness, the comprehensive rainfall runoff coefficient and the catchment area;
the rainwater resource utilization rate is reflected by runoff storage regulation quantity, and the runoff storage regulation quantity is obtained according to the designed rainfall thickness, the runoff storage regulation rate and the catchment area.
5. The sponge power plant planning and design method of claim 4, wherein,
the comprehensive runoff coefficient is obtained by weighted averaging of the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area.
6. The sponge power plant planning and design method of claim 1, wherein,
according to the proportion of the total area of the field occupied by the facilities in the field facility layout scheme, the sinking type green land rate, the permeable pavement rate and the green roof rate are obtained;
and determining the volume of the rainwater storage facility according to the proportion of the total area of the site occupied by the facility, and obtaining the runoff storage regulation rate according to the proportion of the volume of the rainwater storage facility to the total area of the site.
7. The sponge power plant planning and design method of claim 1, wherein,
the sponge power plant application modes comprise a water supplementing mode, a utilization mode and an adjusting mode;
the implementation measures comprise a rainwater infiltration measure, a rainwater transfer measure, a rainwater storage measure, a rainwater regulation measure, a rainwater storage measure and a rainwater purification measure.
8. A planning and design system for a sponge power plant, comprising:
an indicator and target determination module configured to determine an adjustment indicator and a control target; the regulation indexes comprise a sunken green land rate, a permeable pavement rate, a green roof rate and a runoff storage regulation rate, and the control targets comprise a runoff total amount and a runoff pollution removal rate;
the facility layout determining module is configured to determine a site facility layout scheme according to a preset sponge power plant application mode and implementation measures;
the scheme evaluation module is configured to determine the value of each type of regulation index according to the proportion of the facility in the field for each type of field facility layout scheme, and determine the total runoff quantity and the runoff pollution removal rate according to the value of each type of regulation index and the rainfall runoff coefficient of the corresponding area;
and the scheme screening module is configured to evaluate the total runoff amount and the runoff pollution removal rate of each site facility layout scheme according to the control target design value so as to screen an optimal site facility layout scheme.
9. An electronic device comprising a memory and a processor and computer instructions stored on the memory and executed on the processor, the computer instructions when executed by the processor performing the method of any of claims 1-7.
10. A computer-readable storage medium storing computer instructions which, when executed by a processor, perform the method of any one of claims 1 to 7.
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