58results about How to "Reduce daily operating costs" patented technology

Novel fluorophosphite compounds having the structure of general formula (I):where Ar1 and Ar2 are aryl groups containing 4 to 30 carbon atoms; R1 to R6 are H or alkyl or aryl hydrocarbon radicals containing 1 to 40 carbon atoms; and X is a connecting group or a simple chemical bond, were developed and found to be very active for hydroformylation processes for ethylenically unsaturated substrates. Catalyst solutions prepared from these compounds with a Rh metal show an unusual “ligand acceleration effect” for simple alkenes, i.e., the hydroformylation activity increases as the concentration of ligand increases, and are capable of producing linear or branched aldehydes under typical hydroformylation conditions.

The invention discloses a campus rainwater ecological cleaning integrated-processing method and an ecological cleaning integration system. The method comprises the following steps: 1) establishing an integration processing system for processing campus rainwater in a campus in advance; 2) selecting a proper processing method according to ecological purification conditions of different water bodies in the campus; and 3) finally collecting rainwater processed in the step 2) to a landscape water body in the campus, or discharging into a river in the campus, or collecting into the underground water layer of the campus. The system comprises an undercurrent type artificial wetland system for processing campus initial-stage rainfall runoff, a shoreland-area closure system for processing campus storm runoff, an ecological floating bed-aeration plug-flow system for processing campus natural revetment river water body, an artificial waterweed-micropore aeration system for processing campus hard revetment river water body, and a biomanipulation-fountain aeration system for processing campus enclosed pond water body. The beneficial effects comprise that the purification effect is good, the cost is low, the resource utilization rate is high and the purification effect is lasting.

The invention discloses a commodity transaction system for two-dimensional pricing based on time / price of a commodity, a transaction match control method of a transaction server and a transaction system. The transaction server publishes two-dimensional changing information of the time / price of the commodity to a client and the two-dimensional changing information is used for representing the variation tendency of the price along the time; the transaction server is used for counting the commodity price corresponding to the current time and carrying out transaction operation for selling the commodity to the client. Therefore, the system provided by the invention not only reduces selling cost generated by the exchange of a commodity price label due to changing the price, modification of commodity introduction webpage and the like, but also is beneficial to increasing transaction efficiency and improving user experience because a costumer foresees the price in the future when the customer looks up the price label information of the commodity.

The invention discloses a self-adaptive robust day-ahead optimization scheduling method for an optical storage charging tower, and the method comprises the steps: firstly, building a day-ahead energy-standby collaborative optimization scheduling model by taking the minimum daily operation total cost of the optical storage charging tower as a target; considering Influence of photovoltaic output andload uncertainty on day-ahead scheduling, and taking day-ahead energy-standby collaborative optimization scheduling and the real-time energy balance adjustment as a first-stage decision and a second-stage decision, and establishing an adaptive robust three-layer optimization scheduling model; Secondly, describing the uncertainty set by adopting a representative scene, introducing an auxiliary variable to replace the operation cost of the worst scene in the second stage, and realizing decoupling of inner layer min-max problem, so that three-layer optimization is converted into a single-layer robust optimization model containing a limited number of scenes; And finally, testing and solving are carried out in an actual optical storage charging tower system. According to the method, the systemuncertainty can be effectively processed, the complexity of a three-layer optimization model is reduced, meanwhile, a charging tower day-ahead scheduling strategy is obtained, and the obtained resulthas robustness.

The invention provides a rainwater resource utilization system of a composite type medium and a rainwater ecological purifying method of the system, and relates to the technical field of water body purification, aiming at solving the technical problem of ecological purification of rainwater. The system comprises a reservoir, a clean-water reservoir, a control well, a sand sediment trap and a medium composite type constructed wetland, wherein a plurality of water distributing pipes are paved on the medium composite type constructed wetland, and a plurality of water collecting pipes are paved at the bottom of the medium composite type constructed wetland; the reservoir and the clean-water reservoir jointly take the same vertical wall as a side pool wall, and the upper part of the vertical wall is provided with a clean water overflowing opening; the upper part of the wall of the reservoir is provided with an accumulated water overflowing opening, and the bottom of the reservoir is provided with a rainwater lifting pump; the sand sediment trap is arranged at a low-lying place which is good for collecting the rainwater, and is connected to the reservoir by a through hole; the rainwater lifting pump is connected with each water distributing pipe; the water inlet of the control well is connected to each water collecting pipe, and the water outlet of the control well is connected to the clean-water reservoir; and the bottom of the clean-water reservoir is provided with a clean water lifting pump. By using the system and the method provided by the invention, the utilization ratio of rainwater resources is high.

The invention provides a filling system of a pressure differential liquefied natural gas filling station and a method thereof. The filling system comprises a storage tank system, an unloading system, a gas filling system and valve assemblies; the unloading system is arranged between the storage tank system and the tank car of the gas filling station; the gas filling system is arranged between the storage tank system and a gas vehicle to be filled with gas; the valve assembly is arranged in the unloading system, and the unloading system and the storage tank system are connected by use of the valve assembly; the valve assembly is arranged in the storage tank system, and the storage tank system is connected with the gas filling system by use of the valve assembly. The gas vehicles are filled with the liquefied natural gas in a pressure differential manner, and as a result, under the premise that a skid-mounted pump system is omitted, the generation of boil off gas (BOG) is reduced, and the economic efficiency and the environmental protection property are obviously improved.

The invention relates to the technical field of oil delivery, and particularly discloses a wax-bearing crude conveying pipeline. The wax-bearing crude conveying pipeline comprises a metal pipeline and a magnetic impeller arranged in the metal pipeline. The magnetic impeller can freely rotate around the axis of the metal pipeline. Blades of the magnetic impeller are distributed in an N pole and S pole alternate mode. According to the wax-bearing crude conveying pipeline, the magnetic impeller is arranged in the metal pipeline, crude oil inside the metal pipeline flows to push the magnetic impeller to rotate at a high speed, the magnetic field of the pipe wall of the metal pipeline is periodically changed through the magnetic impeller, the pipe wall of the metal pipeline generates induction eddy current under the effect of the alternating magnetic field of the magnetic impeller so as to generate heat, and therefore the crude oil in the metal pipeline can be heated, the pressure energy of the crude oil is partly converted into the heat energy of the pipe wall according to the electromagnetic induction principle, and the whole-line uniform heating or whole-line constant-temperature conveying can be conducted on the wax-bearing crude oil in the metal pipeline.

The invention relates to a plug hole and double-face solder mask screen printing machine and a screen printing method. The screen printing machine comprises a rack, a first screen printing machine body, a second screen printing machine body and a third screen printing machine body, wherein the first screen printing machine body is arranged on the rack and used for achieving plug hole printing of a printing stock, the second screen printing machine body is used for achieving solder mask printing of one side of the printing stock, and the third screen printing machine body is used for achieving solder mask printing of the other side of the printing stock; the first screen printing machine body is connected with the second screen printing machine body through a first panel turnover machine; the second screen printing machine body is connected with the third screen printing machine body through a second panel turnover machine; and the first screen printing machine body, the second screen printing machine body and the third screen printing machine body each comprise a camera shooting counterpoint mechanism with an automatic counterpoint function and for shooting the printing stock, a printing mechanism for carrying out printing operation and a transferring mechanism for achieving transferring of the printing stock between the camera shooting counterpoint mechanism and the printing mechanism. The plug hole and double-face solder mask screen printing machine is high in producing efficiency, low in power consumption and low in total cost, and the problem that the color difference of product appearance is large can be avoided.

The invention discloses an electric heating comprehensive energy system optimal scheduling method considering a refined heat supply network model. The method comprises the following steps: constructing a heat supply network hydraulic model considering refined resistance; constructing a thermodynamic model considering the dynamic characteristics of the heat supply network; time sequence load flow calculation of the electric heating comprehensive energy system is carried out; and optimal scheduling of the electric heating comprehensive energy system is carried out. The method can be used for transient analysis of the electric heating comprehensive energy system; the energy interaction process of different energy networks is analyzed, the economical efficiency of system operation scheduling is improved, the operation development of the comprehensive energy system is promoted, the method is suitable for determining the system operation state of the electric heating comprehensive energy system, and analysis means and other work are provided for system scheduling operation and planning construction.

The invention relates to an acid recovery and purification system for a pickling waste liquid, and belongs to the technical field of wastewater reuse of metal finishing. The system sequentially comprises a waste-acid sedimentation device, a filtration device and an ion exchange resin recovery device; the system further comprises a first storage tank arranged between the waste-acid sedimentation device and the filtration device, and a second storage tank arranged between the filtration device and the ion exchange resin recovery device. The purification system provided by the invention is used for recovery and purification of the pickling waste liquid in the metal finishing industry, and has the advantages of high purity of a cleaning acid, high-efficiency recovery, low energy consumption and less workload.

The invention relates to a modular mobile solar power generation device. The modular mobile solar power generation device takes a container box adapted for vehicle transportation as a frame. Both sidebox plates and a top upper support frame are of a split structure, and a photovoltaic plate is installed, and can be turned to an angle suitable for collecting sunlight. The bottom frame of the box is provided with multi-layered built-in photovoltaic modules, and the multi-layered built-in photovoltaic modules can be sequentially extended to the outside and turned to an angle suitable for solar illumination to absorb solar energy. The interior of the box is provided with a photovoltaic control part which is used for controlling the operation of each photovoltaic plate. Meanwhile, an energy storage battery pack is arranged in the box, and the device can store energy and electricity for external power supply. The device can increase the absorption of solar energy, increase the output of electric energy, realize the mobilization of the device, and meet the power demands in remote areas, various temporary camps, temporary office, production and living places in China, and also solve the practical problem of shortage of electricity and energy in energy-poor, power-underdeveloped countries or regions.

The invention relates to a floor type powdery material storehouse which comprises a storehouse top, storehouse walls, a storehouse bottom and a storehouse foundation, wherein material flowing assisting devices are arranged on the storehouse bottom and are composed of pneumatic fluidization rods which are connected with air supply pipelines, material falling openings are formed in material conveying pipes, a decompression cabin is arranged on each material falling opening of the material conveying pipes, the side wall of each decompression cabin is provided with a feeding notch, the pneumatic fluidization rods are arranged in the material conveying pipes, the material conveying pipes are horizontally arranged on the surface of the storehouse bottom and penetrate through the bottoms of the storehouse walls and extend out of the storehouse, a material flow control device is arranged at a discharge end, located outside each storehouse wall, of each material conveying pipe, the other end, located inside the storehouse, of each material conveying pipe is an air supply end, and the air supply end of each material conveying pipe is connected with an air supply pipeline. In addition, barriers can be arranged on the periphery of each material falling opening of the material conveying pipes. The floor type powdery material storehouse is simple in structure and good in economy and safety performance, and can be widely applied to storage of powdery materials such as coal ash and cement.

Novel trivalent organophosphonite ligands having the structure of general formula (I):wherein R is an alkyl or aryl group containing 1 to 30 carbon atoms; Ar1 and Ar2 are aryl groups containing 4 to 30 carbon atoms; R1 to R6 are H or alkyl or aryl hydrocarbon radicals containing 1 to 40 carbon atoms; and X is a connecting group or a simple chemical bond, were developed and found to be very active for hydroformylation processes for ethylenically unsaturated substrates. Catalyst solutions prepared from these ligands with a Rh metal show an unusual “ligand acceleration effect” for simple alkenes, i.e., the hydroformylation activity increases as the concentration of ligand increases, and are capable of producing linear or branched aldehydes under typical hydroformylation conditions.

The invention discloses a demand response type bus route optimization method considering heterogeneous vehicles, and the method comprises the steps: obtaining the user travel information, which mainly comprises the user travel number, the earliest expected travel time, the latest planned arrival time, and the destination position information; according to the obtained information, constructing a demand response type bus route optimization model considering third-party heterogeneous vehicles, and determining a target function according to actual demands; solving the path optimization model by adopting a column generation algorithm, and finding a lower bound of the demand response type bus path optimization model by continuously adding new feasible paths to a to-be-selected path set; and carrying out branch operation on the obtained lower bound through a branch and bound algorithm to obtain a feasible solution of the demand response type bus route optimization model, namely a group of demand response type bus optimal routes meeting the travel demand of the user. The method can guarantee the quality of the obtained solution, can effectively reduce the daily operation cost of the demand response type bus, and has a practical value.

The invention discloses an intelligent high definition video monitoring system, belonging to the video monitoring technical field, and comprises an intelligent tracking high definition video collection system, a high definition video processing system and a high definition video remote monitoring and processing system. The intelligent tracking high definition video collection system comprises a single-chip microcomputer, an upper computer, an encoder, a power supply circuit, a video collection terminal, a local network access device, a crystal oscillator circuit, a reset circuit, a memory, a display and a clock circuit. The high definition video processing system comprises a control system, a display screen, a decoder, a remote network access device, a local network access device, a storage system, a prompt system and an output system. The high definition video remote monitoring and processing system comprises a remote monitoring and processing system, a remote video storage system, a remote decoder, a remote network access device, a video player and an operating system. The intelligent high definition video monitoring system can automatic identify and track a motion object, automatically adjust an aperture, automatically focus, and perform remote monitoring.

The invention discloses a subway station exit guide method and system. The subway station exit guide method comprises the following steps: acquiring destination address information inputted by a user; according to the current stop information and destination address information, calculating information about an exit name leading to the destination address from the current stop; and displaying or broadcasting the information about the exit name. The subway station exit guide system comprises a destination address input module, an information processing module, a display module and a voice module. By adopting the subway station exit guide method and system, passengers in a subway station can rapidly and accurately inquire the information about the exit name leading to the destination address from the current stop, the passengers can be helped to leave the current stop rapidly, so that the traffic efficiency of the current stop and other subway stations can be improved, the probability of the confliction or accident caused by the retention of the passengers can be reduced, the working intensity of working personnel is alleviated, and the daily operation cost of the subway transportation can be reduced.

The invention relates to denitrifying low-NOx emission control process for a circulating fluidized bed boiler. The denitrifying low-NOx emission control process comprises the following steps that thearea of the evaporating heating surface in the boiler is increased, and the heat absorption capacity of the evaporating heating surface of a boiler furnace is changed; the size of hood small holes ofa wind-distribution plate is adjusted, and the size of slag discharging holes of the wind-distribution plate and the size of hood openings in the surrounding wall surfaces are increased; the inlet velocity and incident angle of an inlet flue of a cyclone separator are adjusted, the circulation area of a riser is adjusted according to the amount of fired coal of the boiler and the efficiency of thecyclone separator, the circulation area and the air volume of material-returning air of a material returning valve are adjusted, the flow rate of materials on the interface of a material returning system is controlled at 90-150kg / s through adjustment, the material circulation of the boiler is increased, and the burning temperature is reduced; and an appropriate amount of low-oxygen flue gas is extracted between a dust remover of the boiler and a draft fan and sent to a primary air inlet or a hot primary air outlet of an air pre-heater, the initial oxygen content of coal combustion is reduced,then the low-oxygen flue gas is fed into a primary air chamber at the bottom of the boiler, and the excess air coefficient of the primary air chamber at the bottom of the boiler is adjusted to be 0.4-0.8.

The invention discloses a confidential propaganda education training system based on virtual reality and an implementation method thereof. A multi-scene switching relation module is used for controlling switching operation of all scenes in the whole system and guaranteeing the correct sequence of single-scene loading and operation. A single-scene operation mechanism module is used for realizing independent operation of a single virtual scene; the multi-scene switching relation module needs to ensure that the next single scene in sequence is in a locked state, and only after the task of the current single scene is completed, the next single scene can be triggered to be unlocked; in addition, what needs to be guaranteed is that in the process that the user receives confidential propaganda education based on virtual reality, immersion interaction experience is completed on the current single scene through the man-machine interaction module. The scene required by the content is displayed in the VR helmet through the virtual reality technology, so that the user interacts with the virtual scene through the handle, and the sense of reality and immersion of the crime scene in the secret-related case are realized.

The invention discloses a river floating object salvaging device and a using method thereof, and relates to the technical field of water environment treatment. The river floating object salvaging device comprises a supporting system, a driving system, a salvaging system and a conveying and collecting system. Blades are pushed by water flow to enable a water wheel to rotate, and power is provided for the salvaging system and the conveying and collecting system. Automatic operation can be achieved, manual management is basically not needed, and the daily operation cost is low. The river floating object salvaging device is suitable for salvage treatment of garbage, branches, green algae, blue-green algae and the like of rivers, the purification efficiency of the rivers is improved, the environment is beautified, and high economic benefits and ecological benefits are obtained.

The invention discloses a low-pressure gas supply system capable of realizing high-efficiency utilization of cold energy of LNG fuel. The low-pressure gas supply system is provided with a central fresh water circulating system and a high-temperature cylinder jacket water circulating system; an LNG low-pressure pump is arranged in an LNG storage tank; the LNG low-pressure pump is connected with each of the high-temperature cylinder jacket water circulating system and the central fresh water circulating system through a pipeline, an LNG evaporator, a BOG preheater and the like; low-temperature LNG is pumped out and is conveyed to the LNG evaporator through the LNG low-pressure pump; and the LNG storage tank is connected with the BOG preheater through the pipeline. According to the low-pressure gas supply system capable of realizing high-efficiency utilization of the cold energy of the LNG fuel, liquid LNG and BOG in the LNG storage tank are converted into natural gas to provide fuel fora low-pressure dual-fuel main engine, a dual-fuel electric generator and a dual-fuel boiler after being subjected to evaporating and heating treatment through a heat exchanger to complete cold energyrelease; through the LNG fuel low-pressure gas supply system, the cold energy released by low-temperature liquid LNG and BOG in a gas supplying process can be utilized by the high-temperature cylinderjacket water circulating system and the low-temperature central fresh water circulating system of a ship, so that high-efficiency utilization of the cold energy in the operation of the ship is realized; and energy consumption is reduced.

The invention relates to a method, device and system for obtaining a subway taking route. The method comprises the steps of obtaining a starting site and an inputted destination site, and obtaining optional routes according to the starting site, the destination site and a prestored subway map; obtaining the boarding time and sites required to be travelled of each optional route, and obtaining thepredicted traveling duration of the sites required to be travelled of each optional route according to the boarding time; respectively obtaining the arrival time of each optional route when arriving at the destination site according to the boarding time, a prestored train timetable of each optional route and the corresponding predicted traveling duration; and calculating the total taking time corresponding to each optional route according to the boarding time and the arrival time, and selecting the optional route corresponding to the shortest total taking time to obtain the optimal taking route. Therefore, the optional route using the least time is enabled to serve as the optimal taking route, and the optimal taking route can be displayed or broadcast to a passenger in voice, thereby beingconvenient for the passenger to take the subway according to the optimal taking route, reducing the travel time, and improving the travel efficiency.

The invention discloses an image forming intelligent high-definition video monitoring system based on optical and electrical correction, and belonging to the technical field of image formation. The system comprises an intelligent tracing high-definition video acquiring system, an image forming and processing system and a high-definition video remote monitoring and processing system; the image forming and processing system comprises a main computer, an image data receiving module, a data processing module, a distortion / bending correction execution condition module, a distortion / bending correction module, a data recording module, a distortion / bending information measurement module, a command input module and an image output processing module; the intelligent tracing high-definition acquiring system comprises a high-definition camera, a data acquiring circuit and a wireless signal emitter; the high-definition remote monitoring and processing system comprises a remote monitoring processing system, a remote video storing system and a remote decoder. The system disclosed by the invention is capable of automatically recognizing and tracing a moving object, automatically adjusting aperture, automatically focusing and reducing the image defect so as to form a high-quality image.

The invention discloses a subway line guiding method and system. The subway line guiding method includes the steps of: acquiring the destination station information selected or input by a user; according to the current station information and the destination station information, calculating at least one taking line information from the current station to the destination station; and displaying or broadcasting the taking line information. The subway line guiding system consists of: a destination station input module, which is used for acquiring the destination station information selected or input by the user; an information processing module, which is used for calculating at least one taking line information from the current station to the destination station according to the current station information and the destination station information; and a display module and a voice module. The subway line guiding method and system can effectively prevent the user from taking wrong line and reducing the travel efficiency, thereby avoiding wasting a lot of time, also easing the subway congestion, and indirectly lowering the daily operation cost of subway traffic.

The invention relates to a device control method and system, and the method comprises the steps that a client side creates a virtual device according to an instruction, and associates the virtual device with a plurality of physical devices according to the instruction, and the device features of the virtual device are consistent with the device features of the physical devices; the terminal where the client is located sends the control signal to the plurality of physical devices associated with the virtual device under the condition that the terminal where the client is located obtains the control signal about the virtual device. Through the method, the problem that the operation cost of a whole-house intelligent system is high in the related technology is solved, and the daily operation cost of the whole-house intelligent system is reduced.

The invention discloses an integrated membrane bioreactor. The integrated membrane bioreactor comprises an anaerobic zone provided with a lining anticorrosive coating layer, an anoxic zone provided with a lining anticorrosive coating layer, an aerobic zone provided with a lining anticorrosive coating layer, a filtering zone provided with a lining anticorrosive coating layer, a MBR subassembly arranged in the filtering zone, a reflux pump, a filter pump, and an air blower. The integrated membrane bioreactor possesses following advantages: (1) treatment efficiency is high, and discharged water can be recycled directly; (2) system operation is stable, flow is simple, equipment is less, and occupied land area is small; (3) sludge age is old, and excess sludge production is low; and (4) operation management is convenient, and automatic control is convenient to realize. According to the integrated membrane bioreactor, activated sludge can be completed intercepted in the integrated membrane bioreactor; hydraulic retention time (HRT) and sludge retention time (SRT) are completed separated in the integrated membrane bioreactor, so that flexible and stable controlling can be realized; at the same time, automatic control is convenient to realize, and automation level of wastewater processing is increased.

The invention relates to a process and device for sulfur recovery and tail gas treatment, in particular to a SWSR-6 sulfur recovery process; acidic gas containing hydrogen sulfide undergoes Claus reaction to generate sulfur and sulfur production tail gas, wherein sulfur is recovered and sulfur production tail gas Incineration, all sulfur-containing media are converted into SO2, forming SO2-containing flue gas, SO2-containing flue gas contacts with absorbent in the flue gas purification tower, SO2 in the flue gas is absorbed by the absorbent, and the flue gas generated in the flue gas purification tower The salt solution reacts with lye, and after crystallization and centrifugation, sodium sulfite is obtained, and the purified flue gas is discharged after removing SO2. The desulfurization process of the present invention produces anhydrous sodium sulfite products that comply with GB 1894, the sulfur recovery rate of the device is close to 100%, and the desulfurization efficiency is close to 100%, ensuring that the SO2 concentration in the exhaust gas of the sulfur recovery device is less than 50mg / Nm3. The present invention also provides SWSR‑6 sulfur recovery device.

The invention provides a data interaction system and method supporting multiple protocols and multiple master stations. The data interaction system comprises a tail end side, a distribution transformer side and a master station side; the tail end side comprises a collector, a power utilization monitoring terminal and an energy collection unit; the tail end side further comprises power distribution equipment, marketing equipment and user equipment; and the power distribution equipment comprises a reactive power compensation device, a phase-change switch, a transformer area general protection device and a branch leakage protection device. The problems that communication networking and data acquisition convergence efficiency of different business objects on a local HPLC network is low, line loss is large, carrier channel resource conflicts exist, and static and dynamic power consumption of a dual-card dual-standby 4G module is high are solved, a single 4G / 5G wireless communication module is utilized, only one SIM card is needed, one station area and one card meet the requirements of multiple business departments, the flow cost is saved, and the daily operation cost is reduced.

The invention relates to a solar direct-current power generation control method for a communication base station. According to a technical scheme, a lightning protection system, a control system, and a detection system are arranged. The lightning protection system is connected in series to an input terminal of a photovoltaic power supply. The control system includes a power supply system control switch and a communication power supply current backflow prevention system. The detection system includes a photovoltaic power supply detection and control system consisting of a DC / DC control power supply, a communication voltage acquisition circuit, a photovoltaic voltage acquisition circuit, and a voltage comparison circuit. A collected communication power supply voltage, a collected photovoltaic voltage, a highest voltage threshold value of the communication power supply are compared and then a control signal is outputted to control turning on or off of a direct-current power supply relay, thereby realizing controlling. The method has the following beneficial effects: a solar direct-current grid-connected power supply problem of a communication base station is solved and thus direct-current grid connection of the solar power generation is realized; the commercial power consumption load of the base station is reduced; objectives of new energy utilization, energy conservation, and emission reduction are achieved; and the daily operation cost of the base station can be saved.

The invention provides a biological nitrogen removal system and a process thereof. The system comprises a primary anaerobic system, a primary anoxic system and a sedimentation system. The primary anaerobic system, the primary anoxic system and the sedimentation system are arranged and communicated in sequence; the primary anaerobic system is a tank body provided with a plug-flow stirring device; the primary anoxic system is a tank body provided with a plug-flow stirring device and an aeration device; the tank bodies of the primary anaerobic system and the primary anoxic system are connected; a separation wall is provided with an opening; the sedimentation system comprises a primary sedimentation tank and a secondary sedimentation tank; the top of primary sedimentation tank is provided with an overflow channel; the bottom of the secondary sedimentation tank is provided with a mud bucket; the upper part of the mud bucket is communicated to the primary sedimentation tank and is provided with an effluent overflow port; and the second sedimentation tank is provided with a baffle plate for preventing short flow. The biological nitrogen removal system can effectively realize interexchange of mud and water, realize synchronous nitrification and denitrification, effectively remove nitrogen-containing pollutants in wastewater and reduce cost. A production flow is compact and floor space can be saved.