Method, system and storage medium for determining adjustable potential of sewage treatment system

Abstract

The present invention provides a method, system and storage medium for determining the adjustable potential of a sewage treatment system, including: calculating the demand response potential that can be provided by each processing stage of the sewage treatment system based on acquired demand response information and real-time data of each processing stage of the sewage treatment system; determining the adjustable potential of the sewage treatment system based on the demand response potential that can be provided by each processing stage of the sewage treatment system and the demand response capacity in the demand response information; wherein the demand response information includes the demand response start time, end time and demand response capacity. The technical solution fully taps the adjustable potential of the sewage treatment system in participating in the demand response and solves the problem of power grid supply and demand balance regulation.

Description

Technical Field

[0001] The invention relates to the field of potential analysis, and in particular to a method, system and storage medium for determining the adjustable potential of a sewage treatment system. Background Art

[0002] With the development of the economy and the rapid growth of installed capacity of new energy, the balance of supply and demand of the power grid faces new challenges. Due to the inherent randomness and volatility of new energy, the large-scale and high-proportion access of new energy cannot provide a stable and continuous power supply to quickly adjust the voltage and frequency fluctuations of the power grid. In addition, the output of new energy does not match the power load, and has certain anti-peak characteristics, which affects the safe and stable operation of the power grid. On the load side, the load shows a peaking characteristic, and the maximum load in many places has been rising year by year. With the widespread implementation of electric energy substitution and the in-depth promotion of re-electrification, the power load will further increase in the future. In addition, with the increase of extreme weather such as cold waves in winter and high temperatures in summer, the phenomenon of short-term power supply shortage in some local areas will become more prominent. If we invest in the construction of peak-shaving power plants with low annual utilization hours, it will cause a great waste of social resources. It is urgent to solve the problem of power grid supply and demand balance through friendly and economical load regulation methods.

[0003] The sewage treatment industry is both an environmental public welfare undertaking and an energy-intensive industry. It has the characteristics of 24-hour continuous operation, huge energy consumption, and high dynamic adjustable potential. When designing, it is often considered to be configured according to the maximum sewage treatment capacity. During operation, the equipment is mostly not adjusted according to the sewage flow, and the treatment capacity has a large redundancy. At present, the research on sewage treatment systems focuses on two aspects. On the one hand, the sewage treatment process of the sewage treatment system is transformed, and on the other hand, the energy-saving upgrade of various sewage treatment equipment is carried out. However, both studies are static transformation processes, and the adjustable potential of participating in the interaction with the power grid during the sewage treatment process is not considered.

[0004] The patent application document with application number CN112624383A and titled "An energy-saving and environmentally friendly domestic sewage treatment device and treatment method" involves the field of sewage discharge, specifically an energy-saving and environmentally friendly domestic sewage treatment device and treatment method, such as Figure 1As shown, the energy-saving and environment-friendly domestic sewage treatment device includes a water inlet pipe, a filtering device, a drain pipe, a hair-chopping device, a sewage treatment device, and a water outlet pipe; the filtering device is connected to the water inlet pipe and is arranged upstream of the drain pipe; the hair-chopping device is arranged in the drain pipe, and includes a hair collecting device, a power component, a hair cutting component, and a hair hooking component; the hair collecting device is arranged in the drain pipe to collect hair in the water flow; the hair cutting component is located at the lower side of the hair collecting device; the hair hooking component is arranged between the hair collecting device and the hair cutting component, and is configured to hook the hair on the hair collecting device, and transport the hair to the hair cutting component for cutting, and then flow to the sewage treatment device with the water flow; the power component rotates under the flow of water, and provides power for the hair cutting component and the hair hooking component; the sewage treatment device is arranged downstream of the drain pipe, so as to add sewage purification materials, fully stir and mix, and then discharge along the water outlet pipe.

[0005] This technology only considers the structure of domestic sewage treatment equipment and its treatment methods, but does not consider the sewage system as a whole. It lacks systematic consideration and has not conducted relevant research on the dynamic adjustment function of the equipment.

[0006] The publication number is "CN103991954A", and the patent name is "A method for energy saving and consumption reduction in sewage treatment plants", such as Figure 2 As shown, a field investigation and test is conducted on a sewage treatment plant where sludge swelling has occurred, the causes of sludge swelling are analyzed and the control experiment is verified. When other influencing conditions of sludge swelling are normal, the aeration volume is reduced, the concentration of dissolved oxygen in the aeration tank is maintained at 1.2-1.5 mg / L, the filamentous bacteria are artificially promoted to grow appropriately, the SVI is maintained between 200 and 300, the sludge is slightly expanded, the hydraulic retention time of the secondary sedimentation tank is increased or the sedimentation efficiency is improved by using inclined plate sedimentation and other measures, and the sludge return ratio is increased at the same time, the sludge loss is controlled, the effluent water quality is guaranteed to meet the standard, and energy saving and consumption reduction are achieved. The invention has low investment and is easy to operate.

[0007] The invention utilizes the phenomenon of sludge micro-expansion caused by insufficient aeration to save energy and reduce consumption, and designs relevant test equipment. Summary of the invention

[0008] In order to solve the problem that the existing technology for sewage treatment is a static transformation process and fails to fully tap the adjustable potential in the sewage treatment process, the present invention provides a method for determining the adjustable potential of a sewage treatment system, comprising:

[0009] Based on the acquired demand response information and the real-time data of each stage of the sewage treatment system, the demand response potential provided by each stage of the sewage treatment system is calculated respectively;

[0010] The adjustable potential of the sewage treatment system is determined based on the demand response potential and demand response information that can be provided by each treatment stage of the sewage treatment system.

[0011] Preferably, the method of calculating the demand response potential that can be provided by each stage of the sewage treatment system based on the acquired demand response information and the real-time data of each stage of the sewage treatment system comprises:

[0012] Calculating demand response potential of the primary treatment stage based on real-time data and predetermined water level information of the primary treatment stage in the sewage treatment system;

[0013] Calculating the demand response potential of the secondary treatment stage in the sewage treatment system based on real-time data of the secondary treatment stage, a unit sewage oxygen content threshold, and a pre-calculated gas supply volume;

[0014] Calculate the demand response potential of the tertiary treatment stage based on real-time data of the tertiary treatment stage in the sewage treatment system, a sludge threshold, and a demand response duration obtained by subtracting a demand response start time from an end time in the demand response information;

[0015] The sewage treatment system comprises the following stages: primary treatment stage, secondary treatment stage and tertiary treatment stage;

[0016] The pre-calculated air supply volume is calculated based on the real-time data of the primary treatment stage and the secondary treatment stage combined with the aeration tank air supply volume formula;

[0017] The demand response information includes the demand response start time, end time and demand response capacity.

[0018] Preferably, the real-time data of the primary treatment stage includes: water level information, sewage density, actual flow rate of the booster pump, working efficiency of the booster pump and efficiency of the motor;

[0019] The real-time data of the secondary treatment stage include: oxygen content of unit sewage, sewage volume in the aeration tank, blower outlet calculated boost pressure, blower efficiency, atmospheric pressure, temperature and working head of the boost pump;

[0020] The real-time data of the tertiary treatment stage include the sludge content of the sewage, the sewage flow rate, the specific energy consumption of the sludge treatment equipment and the dry solid weight after treatment.

[0021] Preferably, the calculating the demand response potential of the primary treatment stage based on the data of the primary treatment stage in the sewage treatment system and the predetermined water level information comprises:

[0022] Calculating the reducible lift pump working head based on the water level information of the primary treatment stage and the predetermined water level information;

[0023] Calculate the demand response potential of the primary treatment stage using a lift pump demand response potential calculation formula based on the density of the sewage in the primary treatment stage, the actual flow rate of the lift pump, the working efficiency of the lift pump, the efficiency of the motor and the reducible working head of the lift pump;

[0024] Among them, the predetermined water level information is determined based on the average of historical water level information when the sewage lifting pump operates normally.

[0025] Preferably, the lift pump demand response potential calculation formula is as follows:

[0026]

[0027] In the formula, is the demand response potential at the primary processing stage, is the density of sewage, is the acceleration due to gravity, To increase the actual flow rate of the pump, To reduce the working head of the lifting pump, To improve the working efficiency of the pump, is the efficiency of the motor.

[0028] Preferably, the calculation of the demand response potential of the secondary treatment stage based on the real-time data of the secondary treatment stage in the sewage treatment system, the unit sewage oxygen content threshold and the pre-calculated gas supply volume includes:

[0029] The oxygen demand of the unit sewage in the aeration tank is obtained by subtracting the oxygen content of the unit sewage in the aeration tank from the oxygen content threshold of the unit sewage in the secondary treatment stage;

[0030] Calculating the short-term reduction in the air supply of the aeration tank based on the oxygen demand of the unit sewage in the aeration tank, the amount of sewage in the aeration tank, and the set air supply;

[0031] The demand response potential of the secondary treatment stage is calculated based on the blower outlet pressure increase, fan efficiency, atmospheric pressure and the short-term reduction in air supply of the aeration tank at the secondary treatment stage, and the blower potential calculation formula is used to calculate the demand response potential of the secondary treatment stage.

[0032] Preferably, the calculation of the short-term reduction in the gas supply of the aeration tank based on the oxygen demand of the unit sewage in the aeration tank, the amount of sewage in the aeration tank and the set gas supply includes:

[0033] The gas supply volume for participating in demand response is obtained by multiplying the oxygen demand of unit sewage in the aeration tank by the sewage volume in the aeration tank;

[0034] The short-term reduced air supply of the aeration tank is obtained based on the set air supply minus the air supply when participating in the demand response.

[0035] Preferably, the blower potential calculation formula is as follows:

[0036]

[0037] In the formula, is the demand response potential of the secondary treatment stage, Calculate the boost pressure for the blower outlet, The aeration tank has a short-term reduction in air supply. is the fan efficiency, is atmospheric pressure.

[0038] Preferably, the calculation of the demand response potential of the tertiary treatment stage based on the real-time data of the tertiary treatment stage in the sewage treatment system, the sludge threshold and the demand response duration obtained by subtracting the demand response start time from the end time in the demand response information comprises:

[0039] Based on the sludge content and sewage flow rate of the tertiary treatment stage, calculate the time to reach the sludge threshold;

[0040] When the duration of reaching the sludge threshold is not less than the demand response duration, the demand response potential of the third-level treatment stage within the demand response duration is the power of the sludge treatment equipment;

[0041] When the time to reach the sludge threshold is less than the demand response time, the demand potential of the tertiary treatment stage within the time to reach the sludge threshold is the power of the sludge treatment equipment, and within the demand response time exceeding the time to reach the sludge threshold, the demand potential of the tertiary treatment stage is zero.

[0042] Preferably, the power of the sludge treatment equipment is calculated as follows:

[0043]

[0044] In the formula, is the power of the sludge treatment equipment, b is the specific energy consumption of sludge treatment equipment, It is the dry solid weight after treatment.

[0045] Preferably, the determining the adjustable potential of the sewage treatment system based on the demand response potential and demand response information that can be provided at each treatment stage of the sewage treatment system includes:

[0046] The total demand response participation potential of the sewage treatment system is obtained by summing the demand response participation potential of the primary treatment stage, the demand response participation potential of the secondary treatment stage and the demand response participation potential of the tertiary treatment stage in the sewage treatment system;

[0047] When the total potential for participating in demand response is less than the demand response capacity, the total demand response potential of the sewage treatment system is the adjustable potential of the sewage treatment system;

[0048] When the total potential of participating in demand response is not less than the demand response capacity, the demand response capacity is used as the adjustable potential of the sewage treatment system.

[0049] Preferably, the aeration tank air supply formula is as follows:

[0050]

[0051] In the formula, Air supply to the aeration tank, a 0.8~0.85, b 0.9~0.97, is the oxygen transfer efficiency, It is the working head of the sewage lifting pump. is the oxygen demand m 3 / h.

[0052] Based on the same inventive concept, the present invention also provides an adjustable potential determination system for a sewage treatment system, comprising:

[0053] A sewage treatment system interactive response strategy module, which is used to calculate the demand response potential that can be provided by each treatment stage of the sewage treatment system based on the acquired demand response information and the real-time data of each treatment stage of the sewage treatment system;

[0054] An adjustable load resource pool management module, used to determine the adjustable potential of the sewage treatment system based on the demand response potential that can be provided by each treatment stage of the sewage treatment system and the demand response capacity in the demand response information;

[0055] The demand response information includes the demand response start time, end time and demand response capacity.

[0056] Preferably, the sewage treatment system interactive response strategy module includes:

[0057] a primary response submodule for calculating the demand response potential of the primary treatment stage based on real-time data of the primary treatment stage of the sewage treatment system and predetermined water level information;

[0058] A secondary response submodule, for calculating the demand response potential of the secondary treatment stage in the sewage treatment system based on real-time data of the secondary treatment stage, a unit sewage oxygen content threshold and a pre-calculated gas supply volume;

[0059] A tertiary response submodule, for calculating the demand response potential of the tertiary treatment stage based on the real-time data of the tertiary treatment stage in the sewage treatment system, the sludge threshold and the demand response duration obtained by subtracting the demand response start time from the end time in the demand response information;

[0060] The sewage treatment system comprises the following stages: primary treatment stage, secondary treatment stage and tertiary treatment stage;

[0061] The pre-calculated air supply volume is calculated based on the real-time data of the primary treatment stage and the secondary treatment stage combined with the aeration tank air supply volume formula.

[0062] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the above-mentioned adjustable potential determination method is implemented.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] The present invention provides a method for analyzing the adjustable potential of a sewage treatment system, comprising: calculating the demand response potential that can be provided by each processing stage of the sewage treatment system based on acquired demand response information and real-time data of each processing stage of the sewage treatment system; determining the adjustable potential of the sewage treatment system based on the demand response potential that can be provided by each processing stage of the sewage treatment system and the demand response capacity in the demand response information; wherein the demand response information includes the demand response start time, end time and demand response capacity. The technical solution fully taps the adjustable potential of the sewage treatment system in participating in the demand response and solves the problem of power grid supply and demand balance regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic diagram of the overall structure of an energy-saving and environment-friendly domestic sewage treatment device in the prior art;

[0066] Figure 2 It is a schematic diagram of a treatment process facility test device of a sewage treatment plant in the prior art;

[0067] Figure 3 A flow chart of a method for determining adjustable potential of a sewage treatment system according to the present invention;

[0068] Figure 4 A schematic diagram of specific implementation steps of an adjustable potential analysis method for a sewage treatment system of the present invention;

[0069] Figure 5 The A / O process flow chart of the sewage treatment system of the present invention;

[0070] Figure 6A schematic diagram of a system for determining the adjustable potential of the present invention;

[0071] Figure 7 A flowchart of the specific steps of the sewage treatment system of the present invention participating in the interactive regulation of the power grid;

[0072] Figure 8 It is the overall flow chart of the sewage treatment system of the present invention participating in the interactive regulation of the power grid;

[0073] Fig. 9 A schematic diagram of a computer-readable storage medium of the present invention. DETAILED DESCRIPTION

[0074] In response to the lack of analysis methods for the adjustable potential of sewage treatment systems, the present invention proposes a method, system and storage medium for determining the adjustable potential of sewage treatment systems. From the perspective of the entire process of the sewage treatment system, through the analysis of the process flow and energy consumption characteristics of the sewage treatment system, the demand response method and adjustable potential of each process link are obtained, and the adjustable potential of the main energy-consuming equipment in each process link is explored.

[0075] Embodiment 1:

[0076] A method for analyzing the adjustable potential of a sewage treatment system, such as Figure 3 As shown, including:

[0077] S1: Calculate the demand response potential provided by each treatment stage of the sewage treatment system based on the acquired demand response duration and the data of each treatment stage of the sewage treatment system;

[0078] S2: Determine the adjustable potential of the sewage treatment system based on the demand response potential that can be provided by each treatment stage of the sewage treatment system.

[0079] In S1: based on the obtained demand response time and the data of each stage of the sewage treatment system, the demand response potential provided by each stage of the sewage treatment system is calculated respectively. Before that, we first introduce the process flow and energy consumption characteristics analysis of the sewage treatment system.

[0080] Step 1: Sewage treatment system process analysis;

[0081] This step analyzes the process and electricity consumption of the A / O process for sewage treatment. Figure 5 As shown, it is the anaerobic-aerobic process. A refers to the anaerobic section, which is used for nitrogen and phosphorus removal; O refers to the aerobic section, which is used to remove organic matter in water. The A / O process uses anaerobic hydrolysis technology as the pretreatment of activated sludge, so this method is an improved activated sludge process, which generally includes three-stage treatment processes.

[0082] Primary treatment: including coarse and fine screens, lifting pumps, cyclone grit chambers and other facilities, using physical solid-liquid separation technology to screen out larger impurities and perform primary sewage purification. The electricity consumed in this stage accounts for about 28% of the total electricity consumption. Among them, the sewage lifting pump is the largest energy-consuming equipment in this section, consuming about 68% of the total electricity consumption in this section. The second is to remove floating matter (SS) in sewage through coarse and fine screens, and its power consumption accounts for about 17% of the total power consumption in this section. The power consumption of other equipment in this treatment stage is relatively small, accounting for only 15%.

[0083] Secondary treatment: Chemical oxygen demand COD and total nitrogen content TN are important indicators reflecting the operation of the process, and most of them can be effectively removed in the second stage. This stage is also called the biochemical treatment stage, which makes organic matter biodegraded and is the most energy-consuming part of the whole process. The main energy-consuming equipment is aeration fans, heating and cooling equipment, etc., which account for about 60% of the total energy consumption.

[0084] Tertiary treatment: sludge treatment stage, the main processes are sludge concentration, dehydration, etc., and its power consumption accounts for about 12% of the total power consumption.

[0085] The analysis of energy-consuming equipment in each process and its energy consumption ratio is shown in Table 1.

[0086] Table 1 Energy consumption analysis of each process in sewage treatment system

[0087]

[0088] Through the process analysis of the sewage treatment system in step 1, the main energy-consuming equipment at each treatment stage of the sewage treatment system is obtained. The adjustable potential analysis of the sewage treatment system is carried out for the main energy-consuming equipment at each treatment stage.

[0089] S1 calculates the demand response potential that can be provided by each stage of the sewage treatment system based on the acquired demand response duration and the data of each stage of the sewage treatment system combined with the energy consumption characteristics of each stage of the sewage treatment system, including:

[0090] like Figure 4 As shown, the present invention first analyzes the process flow of the sewage treatment system, analyzes the energy characteristics and equipment modeling, the demand response method and adjustable potential evaluation, and the adjustable potential analysis system and the sewage treatment system participate in the interactive regulation of the power grid.

[0091] In the previous part, we first analyzed the energy characteristics of the sewage treatment system and modeled the equipment; now we will evaluate the demand response methods and adjustable potential of the sewage treatment system at all levels. The detailed steps are as follows:

[0092] Step 2: Energy characteristics analysis and equipment modeling of sewage treatment system;

[0093] The equipment with the largest power consumption in the sewage treatment system's power load is the water pump and the fan, in addition there is a portion of electricity consumed for living and office use in the factory area.

[0094] (1) Primary treatment stage (wastewater lifting stage)

[0095] After sewage enters the coarse screen, it needs to be lifted to a high water level to facilitate the water flow into the subsequent treatment link. The sewage lifting pump is a high-energy-consuming equipment, and its energy consumption accounts for about one-fifth of the overall energy consumption of the sewage treatment plant. The factors that have a greater impact on the energy consumption of the lifting pump are mainly the operating efficiency of the lifting pump and the sewage lifting height, which can also be called the lifting head. In the actual process of selecting a lifting pump, the two factors that are often considered are the lifting head and the maximum flow rate. However, in daily work, the lifting pump is often not running at the maximum flow state, and is in a low-efficiency operating range, resulting in additional energy consumption. The main energy consumption model of the sewage lifting pump is as follows:

[0096] (1)

[0097] (2)

[0098] (3)

[0099] In the formula, is the sewage lifting pump power, kW; is the density of sewage, 1.0x10 3 kg / m 3 ; is the acceleration due to gravity, 9.81m / s 2 ; is the actual flow rate of the lifting pump, m 3 / s; is the actual working head of the lifting pump, m; To improve the working efficiency of the pump, 0.65-0.85; is the efficiency of the motor, 0.95; is working time, h; is the actual sewage lifting height, m; is the head loss of the lifting pump, m; is the comprehensive impedance of the pipeline s 2 / m 5 ; is the resistance coefficient along the pipeline; l is the length of the pipeline, m; is the total local resistance coefficient of the pipeline; is the pipe diameter, m.

[0100] From formula (1), it can be seen that the factor that has the greatest impact on the energy consumption of the sewage lifting pump is the actual working head of the lifting pump. The actual working head includes the actual sewage lifting height and the head loss of the lifting pump. In general, the pressurized water pipeline in the sewage treatment system is relatively short and the head loss is small, so it can be considered that the key factor affecting the energy consumption of the lifting pump is the actual sewage lifting height.

[0101] Through the above analysis of the primary treatment stage, it is concluded that while ensuring that the pipe network does not overflow, the average liquid level in the collection tank should be kept at a higher safe water level as much as possible, reducing the pump head and thus reducing the energy consumption of the lifting pump.

[0102] (2) Secondary treatment stage (aeration stage)

[0103] Aeration is required in the process of aerobic treatment of sewage to decompose organic matter in water, so that there is a suitable dissolved oxygen concentration in the water to ensure the normal biochemical reaction of microorganisms. Aeration equipment is another high-energy-consuming equipment in the sewage treatment system, and its energy consumption accounts for about 50% of the total energy consumption. A progressive aeration method can be adopted, and aeration arrangements can be carried out in different stages for precise aeration. The aeration methods used in the aeration system are mainly blast aeration and surface aeration, among which blast aeration is currently the most widely used aeration method. In principle, blast aeration is to compress the air and then transport it to the bottom of the pool to diffuse it, so that oxygen and water are fully in contact, so as to achieve the purpose of supplying microorganisms. Therefore, in order to determine the energy consumption efficiency of the aeration system in actual operation, it is necessary to calculate the relationship between the system air supply and the actual oxygen demand. The closer the ratio of the two is to 1, the better. Too large a ratio consumes more energy, while too small a ratio will result in substandard effluent.

[0104] Aeration air supply:

[0105] (4)

[0106] In the formula, is the air supply volume of the aeration tank, m 3 / h; a 0.8~0.85, b 0.9~0.97; is the oxygen transfer efficiency; is the oxygen demand m 3 / h; It is the working head of the sewage lifting pump.

[0107] The calculation formula of gas supply under standard atmospheric pressure can be simplified as follows:

[0108] (5)

[0109] In the formula, It is the oxygenation capacity of deoxygenated clean water at 20℃ (kg / h).

[0110] In actual engineering design, the blower power can be calculated based on the air supply and wind pressure value:

[0111] (6)

[0112] (7)

[0113] In the formula, Calculate the boost pressure at the blower outlet, kg / cm 2 ; The fan efficiency is generally between 0.7 and 0.8; is atmospheric pressure, kg / cm 2 ; is the daily working hours, h; The electrical energy consumed is kWh.

[0114] (3) Tertiary treatment stage (sludge treatment)

[0115] Sludge treatment is one of the most energy-intensive stages in the overall sewage treatment process. In this stage, the sludge is concentrated, dehydrated, stabilized, and incinerated to make it harmless. The energy consumption of this system accounts for about 11% of the total energy consumption, and its energy consumption is mainly determined by the amount of sludge production. The higher the sludge production, the more electricity is consumed for treatment.

[0116] (8)

[0117] Where, V is the amount of dry mud, t / h; K It is the conversion coefficient between sewage treatment volume and dry sludge volume, which is related to raw water turbidity and chemical dosage.

[0118] Calculation of electricity consumption for sludge treatment:

[0119] (9)

[0120] (10)

[0121] In the formula, is the dehydrator power, kW; is the specific energy consumption of the dehydrator kWh / t; is the dry solid weight after dehydration, t; The power consumption of the dehydrator is kWh; is the working time, h.

[0122] Step 3: Assessment of demand response methods and adjustable potential at all levels of the wastewater treatment system;

[0123] (1) Demand response methods and adjustable potential at the primary treatment stage

[0124] In the primary treatment process, the main electrical equipment is the sewage lift pump, and the adjustable potential is mainly concentrated here. In the process of sewage treatment plant elevation design, most of the head loss is calculated by estimation method, and the estimated value is often higher than the correct value, which leads to the phenomenon of high pump head in the actual design process.

[0125] Therefore, when designing a sewage treatment system, the calculation of the total water level difference of the sewage treatment system needs to be effectively combined with the terrain, and calculated using detailed hydraulics, so that the determined pump head is more reasonable. At the same time, in order to further achieve the effect of energy saving, it is also necessary to reduce the pump head as much as possible, that is, to achieve a one-time lift as much as possible during the elevation design, and to select a reasonable equipment type to connect the water inlet, outlet and pipeline of the structure to effectively reduce the head loss. The present invention mainly adopts the method of reducing the pump head for demand response.

[0126] The potential for demand response at the primary treatment stage includes:

[0127] Calculating the reducible lift pump working head based on the water level information of the primary treatment stage and the predetermined water level information;

[0128] The demand response potential of the primary treatment stage is calculated using the demand response potential calculation formula of the lift pump based on the density of the sewage in the primary treatment stage, the actual flow of the lift pump, the working efficiency of the lift pump, the efficiency of the motor and the reducible working head of the lift pump;

[0129] Among them, the predetermined water level information is determined based on the average of historical water level information when the sewage lifting pump operates normally.

[0130] The formula for calculating the boost pump demand response potential is:

[0131] (12)

[0132] In the formula, is the demand response potential of the primary treatment stage, kW; is the density of sewage, 1.0x10 3 kg / m 3 ; is the acceleration due to gravity, 9.81m / s 2 ; is the actual flow rate of the lifting pump, m 3 / s; is the working head of the reducible lift pump, m; To improve the working efficiency of the pump, 0.65-0.85; is the efficiency of the motor, 0.95.

[0133] (2) Demand response methods and adjustable potential in the secondary treatment stage

[0134] The main adjustable potential in the secondary treatment stage is in the fan of the aeration system. When designing a sewage treatment system, the scale of the aeration system needs to be determined based on the hourly peak or daily peak oxygen demand. During the operation of the aeration system, the oxygen content is often not accurately measured in real time. By accurately measuring and monitoring the oxygen content in the water, reasonable control measures can be taken to reduce the power consumption of the aeration system. In this way, even in the case of insufficient oxygen, the activated sludge can operate normally for a period of time without causing much impact on the water quality. Therefore, the demand response method in the secondary treatment stage is mainly to reduce the aeration volume.

[0135] The demand response potential at the secondary treatment stage includes:

[0136] The oxygen demand per unit of sewage in the aeration tank is obtained by subtracting the oxygen content per unit of sewage in the aeration tank from the oxygen content threshold per unit of sewage in the secondary treatment stage;

[0137] The short-term reduction in the aeration tank's air supply is calculated based on the oxygen demand per unit of sewage in the aeration tank, the amount of sewage in the aeration tank, and the set air supply;

[0138] The demand response potential of the secondary treatment stage is calculated based on the blower outlet pressure increase, fan efficiency, atmospheric pressure and the short-term reduction in air supply in the aeration tank, and the blower potential calculation formula is used to calculate the demand response potential of the secondary treatment stage.

[0139] The blower potential calculation formula is as follows:

[0140] (13)

[0141] In the formula, is the demand response potential of the secondary processing stage, Calculate the boost pressure at the blower outlet, kg / cm 2 ; is the short-term reduction in air supply in the aeration tank, m 3 / h; is the fan efficiency, generally between 0.7 and 0.8; is atmospheric pressure, kg / cm 2 .

[0142] (3) Demand response methods and adjustable potential in the third-level processing stage

[0143] The sludge treatment capacity of the sewage treatment system is related to the sewage treatment process, sewage quality and other factors. Generally, sewage treatment systems have a certain sludge storage capacity. Based on this feature, the equipment can be shut down or the equipment power can be reduced during peak power consumption periods. In particular, the impact of shutting down equipment on the overall sewage treatment is controllable. In order to obtain greater potential, the demand response method of shutting down the equipment and temporarily stopping the operation can be adopted.

[0144] The demand response potential of the three-level processing stage includes:

[0145] Based on the sludge content and sewage flow rate of the tertiary treatment stage, calculate the time to reach the sludge threshold;

[0146] When the duration of reaching the sludge threshold is not less than the demand response duration, the demand response potential of the third-level treatment stage within the demand response duration is the power of the sludge treatment equipment;

[0147] When the time to reach the sludge threshold is less than the demand response time, the demand potential of the tertiary treatment stage within the time to reach the sludge threshold is the power of the sludge treatment equipment, and during the demand response time exceeding the time to reach the sludge threshold, the demand potential of the tertiary treatment stage is zero.

[0148] The adjustable potential within the duration of the sludge threshold is calculated as follows:

[0149] (14)

[0150] In the formula, Demand response capacity that can be provided by temporarily stopping work in the sewage treatment stage, Kw, The power of the sludge treatment equipment.

[0151] (4) Calculation of total adjustable potential

[0152] The total adjustable load potential of the sewage treatment system is the sum of the load adjustable potentials in the first, second and third stage sewage treatment processes.

[0153] (15)

[0154] (16)

[0155] In the formula, is the total adjustable potential of the sewage treatment system during demand response, kW; It is the adjustable potential that can be obtained by adjusting the energy consumption of electrical equipment in the first, second and third stage treatment processes during sewage treatment, kW.

[0156] The method for determining the adjustable potential of a sewage treatment system provided by the present invention can improve the profits of enterprises. For example, the number of sewage treatment systems is about 10,000 sets, and the average daily sewage treatment volume is 200 million tons. Calculated based on the average power consumption of 240kW, the demand response potential can reach 40%, and the theoretical adjustable load scale is 960,000 kW, which is equivalent to a 960,000 kW virtual generator set. Calculated based on the investment of 9,000 yuan for 1kW of power generation, transmission, and distribution, 8.6 billion yuan of related power investment can be saved. At the same time, electricity charges account for as much as 50%-70% of the sewage treatment cost. The sewage treatment system can obtain subsidies by participating in grid interaction, thereby increasing corporate profits.

[0157] Embodiment 2:

[0158] Based on the same inventive concept, the present invention also provides a system for determining the adjustable potential of a sewage treatment system, which can be applied to an existing adjustable load system and an adjustable load terminal, suitable for mining the adjustable potential of a sewage treatment system, and can also be applied to related environmental monitoring, providing a flexible solution to alleviate the problem of power shortage in local areas. The adjustable potential determination system is introduced below.

[0159] A system for determining the adjustable potential of a sewage treatment system, such as Figure 6 As shown, it includes a sewage treatment system interactive response strategy module and an adjustable load resource pool management module;

[0160] A sewage treatment system interactive response strategy module, which is used to calculate the demand response potential that can be provided by each treatment stage of the sewage treatment system based on the acquired demand response information and the real-time data of each treatment stage of the sewage treatment system;

[0161] An adjustable load resource pool management module is used to determine the adjustable potential of the sewage treatment system based on the demand response potential that can be provided by each treatment stage of the sewage treatment system and the demand response capacity in the demand response information;

[0162] The demand response information includes the demand response start time, end time and demand response capacity.

[0163] The sewage treatment system interactive response strategy module includes:

[0164] A primary response submodule for calculating the demand response potential of the primary treatment stage based on real-time data and predetermined water level information of the primary treatment stage in the wastewater treatment system;

[0165] A secondary response submodule for calculating the demand response potential of the secondary treatment stage in the sewage treatment system based on real-time data of the secondary treatment stage, a unit sewage oxygen content threshold, and a pre-calculated gas supply volume;

[0166] A tertiary response submodule, for calculating the demand response potential of the tertiary treatment stage based on the real-time data of the tertiary treatment stage in the sewage treatment system, the sludge threshold, and the demand response duration obtained by subtracting the demand response start time from the end time in the demand response information;

[0167] Among them, the various treatment stages of the sewage treatment system include: primary treatment stage, secondary treatment stage and tertiary treatment stage;

[0168] The pre-calculated air supply is based on real-time data from the primary and secondary treatment stages combined with the aeration tank air supply formula.

[0169] The following is a detailed description of the sewage treatment system interactive response strategy module and the adjustable load resource pool management module participating in the grid interaction in the adjustable potential determination system of a sewage treatment system:

[0170] The main functions of the sewage treatment system interactive response strategy module are as follows: Figure 7 As shown, it receives and analyzes demand response signals and matches demand response strategies; determines the response level and response capacity based on electrical parameters, environmental parameters and state parameters, and interacts with server information to generate operation control strategies. It can be summarized as response capacity calculation, response process control and other functions. The detailed introduction is as follows:

[0171] 1) Response capacity calculation: After receiving the demand response information of the interactive regulation of the power grid, the sewage treatment system users will obtain specific requirements such as demand response capacity, response start time, and end time. At the same time, the monitoring equipment in each link of the sewage treatment system will obtain real-time information such as equipment operation mode, operation power, and sewage treatment flow and upload it to the interactive response strategy module of the sewage treatment system. The interactive response strategy module of the sewage treatment system will derive the appropriate regulation method and corresponding adjustable potential of each sewage treatment link according to the system operation status, and rank the regulation priority according to the equipment response speed, regulation cost, and adjustable capacity.

[0172] 2) Response process control: The response capacity calculation function obtains the adjustment priority ranking of each device, and allocates the total adjustment demand according to the priority ranking, firstly allocating it to the equipment with low adjustment cost, small impact on the production process and fast adjustment speed. Among them, the three-level treatment in the sewage treatment process has the highest response priority, and the primary and secondary treatment processes have a mutual constraint relationship and must be adjusted in a linked manner.

[0173] 3) Implementation effect calculation: record and store the response information, including the start time and end time of equipment adjustment, the electrical and environmental parameters of the response process, and judge the effectiveness of the response. When the maximum load during the response period is not higher than the baseline load and the difference between the baseline and the response time load is within 20% of the reported confirmed response capacity error, the response is judged to be valid, providing a basis for subsequent subsidy calculations.

[0174] Adjustable load resource pool management module: determines the adjustable potential of the sewage treatment system based on the demand response potential that can be provided by each treatment stage of the sewage treatment system and the demand response capacity in the demand response information.

[0175] The adjustable load resource pool management module also has user management functions and resource management functions as shown in Table 2, wherein the user management functions include: user registration, file management, and information query; the resource management functions include: parameter maintenance functions, resource classification, and adjustable load resource registration.

[0176] The functions of each module are described in detail as follows:

[0177] 1) User registration function: Sewage treatment system users can register in the system, and the system stores information such as sewage treatment system user name, number, address, contact person, contact information, maximum adjustable potential, etc.

[0178] 2) Archives management function: Record the historical situation of the sewage treatment system's participation in demand response and other grid supply and demand balance regulation, and update it in time after participation, and set up archive creation, modification, deletion permissions and operation records. The historical situation includes basic information of the sewage treatment system, information on participating in grid regulation contracts, number of times participating in regulation, and execution results.

[0179] 3) Information query function: Inquiries can be made based on the basic information of sewage treatment system users, electricity consumption records, and historical participation in grid supply and demand balance regulation.

[0180] 4) Adjustable load resource registration function: When registering adjustable load resources, the sewage treatment system should fill in the name of the adjustable load equipment, equipment rated power, minimum stable operating power, maximum operating power, whether it has a communication interface, and the maximum number of responses in years, months, and days.

[0181] 5) Parameter maintenance function: For the adjustable load resources registered in the sewage treatment system, record the adjustable power of the equipment participating in the interactive regulation of the power grid, equipment response speed, sustainable regulation time, advance notification time of regulation information, etc., and update them when the equipment parameters change.

[0182] 6) Resource classification function: According to the information after the user parameters of the sewage treatment system are maintained, the registered adjustable load resources will be classified in the adjustment demand scenarios such as peak regulation, frequency regulation, absorption of new energy, system hot and cold standby, and different categories of adjustable load resources will be called according to specific response needs.

[0183] Table 2 Adjustable load resource pool management module functions

[0184]

[0185] (7) Implement demand response and participate in grid interactive regulation, such as Figure 8 As shown:

[0186] After the demand response event is triggered, the strategy given by the sewage treatment system interactive response strategy module embedded in the load interactive response system can be adjusted to respond. In the primary treatment process, water is stored in advance to reduce the working head of the sewage lifting pump, thereby reducing the power consumption of the lifting pump. In the secondary treatment process, the fan power of the aeration system is reduced while ensuring the oxygen demand of microorganisms in the water. In the tertiary treatment process, the sludge treatment equipment can be shut down.

[0187] The specific response process is as follows:

[0188] 1) The adjustable load interactive response device receives the demand response event information sent by the grid-side demand response server through the communication network, obtains the load reduction and electricity price change information through analysis, and selects the corresponding demand response strategy through the adjustable potential analysis method carrier module.

[0189] 2) According to the corresponding demand response strategy and the current electrical parameters, operating status parameters and environmental parameters of the sewage treatment system equipment, a specific response plan is determined, and a feedback signal is sent to the grid-side demand response server.

[0190] 3) The response server automatically sends a receipt confirmation signal based on the received feedback signal.

[0191] 4) The adjustable load interactive response terminal forms a specific response level and response capacity according to the confirmed response plan, and generates control instructions for the adjustable equipment of the sewage treatment system.

[0192] 5) When the demand response event ends, the load interactive response terminal can record the start time, end time, power and environmental parameters of the response process, and feed them back to the demand response server. At the same time, the file information and parameter maintenance in the load-bearing module are updated.

[0193] The demand response server summarizes and evaluates the sewage treatment system power data uploaded by relevant detection equipment, calculates the response amount and judges the effectiveness of the response, and sends the evaluation results to the user (load integrator). After the user confirms that there is no objection, the subsequent subsidy calculation is carried out and the subsidy is issued.

[0194] Embodiment 3:

[0195] The embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the above-mentioned adjustable potential determination method is implemented.

[0196] The above steps have obtained the adjustable potential analysis method in the first, second and third stage treatment process of the sewage treatment system. This step writes the adjustable potential analysis method into a computer readable storage medium in the form of a function, such as Fig. 9 shown.

[0197] The adjustable potential analysis method is written into a computer-readable storage medium in the form of a function. The specific steps are as follows:

[0198] The adjustment potential calculation formulas (12) to (16) in the adjustable analysis of the above steps (1) to (4) are written in the form of functions into a computer-readable storage medium. Among them, formula (12) is function 1, named as the primary treatment adjustable potential calculation function, formula (13) is function 2, named as the secondary treatment adjustable potential calculation module, formula (14) is function 3, named as the tertiary treatment adjustable potential calculation module, and formulas (15) and (16) are functions 4 and 5, named as the total adjustable potential calculation module. The functions are written into a computer-readable storage medium, and when the sewage treatment system user participates in the grid interaction, the adjustable potential determination method of the sewage treatment system is calculated by executing the computer program in the computer-readable storage medium.

[0199] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0200] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0201] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0202] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0203] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A method for determining the adjustable potential of a sewage treatment system, characterized in that: include: Based on the acquired demand response information and the real-time data of each stage of the sewage treatment system, the demand response potential provided by each stage of the sewage treatment system is calculated respectively; Determining the adjustable potential of the sewage treatment system based on the demand response potential that can be provided by each treatment stage of the sewage treatment system and the demand response information; The demand response potential provided by each stage of the sewage treatment system is calculated based on the acquired demand response information and the real-time data of each stage of the sewage treatment system, including: Calculating demand response potential of the primary treatment stage based on real-time data and predetermined water level information of the primary treatment stage in the sewage treatment system; Calculating the demand response potential of the secondary treatment stage in the sewage treatment system based on real-time data of the secondary treatment stage, a unit sewage oxygen content threshold, and a pre-calculated gas supply volume; Calculate the demand response potential of the tertiary treatment stage based on real-time data of the tertiary treatment stage in the sewage treatment system, a sludge threshold, and a demand response duration obtained by subtracting a demand response start time from an end time in the demand response information; The sewage treatment system comprises the following stages: primary treatment stage, secondary treatment stage and tertiary treatment stage; The pre-calculated air supply volume is calculated based on the real-time data of the primary treatment stage and the secondary treatment stage combined with the aeration tank air supply volume formula; The demand response information includes the demand response start time, end time and demand response capacity; The real-time data of the primary treatment stage includes: water level information, sewage density, actual flow rate of the booster pump, working efficiency of the booster pump and efficiency of the motor; The real-time data of the secondary treatment stage include: oxygen content of unit sewage, sewage volume in the aeration tank, blower outlet calculated boost pressure, blower efficiency, atmospheric pressure, temperature and working head of the boost pump; The real-time data of the three-stage treatment stage include the sludge content of the sewage, the sewage flow rate, the specific energy consumption of the sludge treatment equipment and the dry solid weight after treatment; The calculating of the demand response potential of the secondary treatment stage based on the real-time data of the secondary treatment stage in the sewage treatment system, the unit sewage oxygen content threshold and the pre-calculated gas supply volume comprises: The oxygen demand of the unit sewage in the aeration tank is obtained by subtracting the oxygen content of the unit sewage in the aeration tank from the oxygen content threshold of the unit sewage in the secondary treatment stage; Calculating the short-term reduction in the air supply of the aeration tank based on the oxygen demand of the unit sewage in the aeration tank, the amount of sewage in the aeration tank, and the set air supply; Based on the blower outlet pressure calculation of the secondary treatment stage, the blower efficiency, the atmospheric pressure and the short-term reduction of the air supply of the aeration tank, the demand response potential of the secondary treatment stage is calculated using the blower potential calculation formula; The calculation of the short-term reduction in the gas supply of the aeration tank based on the oxygen demand of the unit sewage in the aeration tank, the amount of sewage in the aeration tank and the set gas supply includes: The gas supply volume for participating in demand response is obtained by multiplying the oxygen demand of unit sewage in the aeration tank by the sewage volume in the aeration tank; The air supply amount of the aeration tank that is reduced in a short time is obtained by subtracting the air supply amount when participating in the demand response from the set air supply amount; The blower potential calculation formula is as follows: In the formula, is the demand response potential of the secondary treatment stage, P′ is the calculated boost pressure at the blower outlet, ΔG s is the short-term reduction in air supply in the aeration tank, n wind is the fan efficiency, Pa is the atmospheric pressure.

2. The method according to claim 1, characterized in that The calculating the demand response potential of the primary treatment stage based on the data of the primary treatment stage in the sewage treatment system and the predetermined water level information comprises: Calculating the reducible lift pump working head based on the water level information of the primary treatment stage and the predetermined water level information; Calculate the demand response potential of the primary treatment stage using a lift pump demand response potential calculation formula based on the density of the sewage in the primary treatment stage, the actual flow rate of the lift pump, the working efficiency of the lift pump, the efficiency of the motor and the reducible working head of the lift pump; Among them, the predetermined water level information is determined based on the average of historical water level information when the sewage lifting pump operates normally.

3. The method according to claim 2, characterized in that The lift pump demand response potential calculation formula is as follows: In the formula, is the demand response potential of the primary processing stage, ρ water is the density of sewage, g is the acceleration due to gravity, Q water is the actual flow rate of the lift pump, ΔH pump is the lowerable lift pump working head, η pump To improve the working efficiency of the pump, η motor is the efficiency of the motor.

4. The method according to claim 1, characterized in that The method of calculating the demand response potential of the tertiary treatment stage based on the real-time data of the tertiary treatment stage in the sewage treatment system, the sludge threshold, and the demand response duration obtained by subtracting the demand response start time from the end time in the demand response information comprises: Based on the sludge content and sewage flow rate of the tertiary treatment stage, calculate the time to reach the sludge threshold; When the duration of reaching the sludge threshold is not less than the demand response duration, the demand response potential of the third-level treatment stage within the demand response duration is the power of the sludge treatment equipment; When the time to reach the sludge threshold is less than the demand response time, the demand potential of the tertiary treatment stage within the time to reach the sludge threshold is the power of the sludge treatment equipment, and within the demand response time exceeding the time to reach the sludge threshold, the demand potential of the tertiary treatment stage is zero.

5. The method according to claim 4, characterized in that The power of the sludge treatment equipment is calculated as follows: P 3 =t solid ×b Where P 3 is the power of the sludge treatment equipment, b is the specific energy consumption of the sludge treatment equipment, t solid It is the dry solid weight after treatment.

6. The method according to claim 1, characterized in that The determining of the adjustable potential of the sewage treatment system based on the demand response potential and demand response information that can be provided at each treatment stage of the sewage treatment system includes: The total demand response participation potential of the sewage treatment system is obtained by summing the demand response participation potential of the primary treatment stage, the demand response participation potential of the secondary treatment stage and the demand response participation potential of the tertiary treatment stage in the sewage treatment system; When the total potential for participating in demand response is less than the demand response capacity, the total demand response potential of the sewage treatment system is the adjustable potential of the sewage treatment system; When the total potential of participating in demand response is not less than the demand response capacity, the demand response capacity is used as the adjustable potential of the sewage treatment system.

7. The method according to claim 1, characterized in that The aeration tank air supply formula is as follows: In the formula, G s is the air supply of the aeration tank, a is 0.8~0.85, b is 0.9~0.97, E A is the oxygen transfer efficiency, H pump is the working head of the Hpup sewage lifting pump, R oxy is the oxygen demand m 3 / h.

8. A system for implementing the method for determining the adjustable potential of a sewage treatment system according to any one of claims 1 to 7, characterized in that: include: A sewage treatment system interactive response strategy module, which is used to calculate the demand response potential that can be provided by each treatment stage of the sewage treatment system based on the acquired demand response information and the real-time data of each treatment stage of the sewage treatment system; An adjustable load resource pool management module, used to determine the adjustable potential of the sewage treatment system based on the demand response potential that can be provided by each treatment stage of the sewage treatment system and the demand response capacity in the demand response information; The demand response information includes the demand response start time, end time and demand response capacity.

9. The system according to claim 8, characterized in that The sewage treatment system interactive response strategy module includes: a primary response submodule for calculating the demand response potential of the primary treatment stage based on real-time data of the primary treatment stage of the sewage treatment system and predetermined water level information; A secondary response submodule, for calculating the demand response potential of the secondary treatment stage in the sewage treatment system based on real-time data of the secondary treatment stage, a unit sewage oxygen content threshold and a pre-calculated gas supply volume; A tertiary response submodule, for calculating the demand response potential of the tertiary treatment stage based on the real-time data of the tertiary treatment stage in the sewage treatment system, the sludge threshold and the demand response duration obtained by subtracting the demand response start time from the end time in the demand response information; The sewage treatment system comprises the following stages: primary treatment stage, secondary treatment stage and tertiary treatment stage; The pre-calculated air supply volume is calculated based on the real-time data of the primary treatment stage and the secondary treatment stage combined with the aeration tank air supply volume formula.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the adjustable potential determination method as claimed in any one of claims 1 to 7 is implemented.

Images