42results about How to "Guaranteed operating economy" patented technology

The invention discloses a regional energy internet scheduling method based on random planning and model predictive control. The method comprises the steps of (1) analyzing the operation characteristics of all units and interconnection lines in a regional energy internet, and constructing a mathematical model of each unit; (2) analyzing the output of the wind and light renewable energy and the uncertainty of cold, heat and electric loads, and generating prediction scene data which are required for the operation of the optimization scheduling by adopting the scene generation and reduction technology; (3) establishing a day-ahead scheduling random planning model with the lowest total operating cost of the system as a target, and determining the on-off state of each unit; (4) establishing an intra-day scheduling random planning model with the lowest total operating cost of the system as a target, and determining the running power in each unit within a day; (5) establishing an intra-day real-time rolling correction model by adopting the model predictive control technology, and correcting the operation plan of each unit. According to the invention, the accurate tracking of loads and thesmooth unit output are achieved. The high dynamic performance and the strong robustness are also realized.

An oven using one or more quartz tungsten light bulbs capable of producing 1.5 kW of radiant energy of which a significant portion is light energy in the 0.4 to 0.7 mu m wavelength range impinges high intensity visible light wave radiation directly onto a food item. Light sources can be positioned above and below the food item and the inner walls of the oven are preferably highly reflective to reflect light energy onto the food. The intensity of the visible light source is automatically controllable and can be varied throughout the cooking cycle.

The invention discloses a coordinating economic dispatching method for a power system containing large-scale wind power based on risk control, comprising the following steps: collecting historical weather data and historical load curve data, and predicting the weather and wind speed in the remaining period of time of next 24 hours; predicting the load and wind power of the previous day, and obtaining a wind power output curve, a load curve and a net load curve in the remaining period of time of next 24 hours; modeling the net load, and obtaining the standard deviation of net load prediction error and the net load values in different scenarios; giving the risk degree, calculating the risk reserve in the remaining period of time of next 24 hours, and obtaining a risk reserve curve; calculating the risk reserve capacity, and obtaining a risk capacity curve; correcting a unit combination plan; and calculating the expected value of operation cost of the power system in the remaining period of time of next day. A strategy based on coordination between previous day economic dispatching and current day rolling economic dispatching is introduced, which not only can ensure that the operation risk of the power system is controllable, but also can ensure the operation economy of the power system.

The present invention relates to a nozzle for use in a metalworking process, whereby the nozzle is designed to precisely deliver an oil-containing liquid and nonflammable gas mixture onto the interface between a metalworking tool and a workpiece, whereby the nozzle is comprised of a tip and a valve body affixed to one another. Furthermore, the present invention relates to a method for cooling and lubricating a tool and workpiece during a metalworking process.

A system (1) for removing carbon dioxide (CO2) from a gas stream by bringing the gas stream into contact with a circulating ammoniated solution stream such that CO2 is absorbed in said ammoniated solution, characterized in that the system comprises a membrane purifier (17), said membrane purifier having a first compartment (18) and a second compartment (19), wherein said first and second compartment are separated by a semipermeable membrane (20), a method for removing carbon dioxide (CO2) from a gas stream by bringing the gas stream into contact with a circulating ammoniated solution stream such that CO2 is absorbed in said ammoniated solution, said method comprising the step of separating trace components from a circulating solution using a semipermeable membrane, and the use of a membrane purifier having a first and a second compartment, wherein said first and a second compartments are separated by a semipermeable membrane, for reducing the trace component and/or water content of a circulating solution stream in a method or system for removing carbon dioxide (CO2) using a circulating ammoniated solution.

The invention discloses a method for realizing reheat steam temperature multivariable coordinate predictive control through performance indexes. According to the method, the reheat steam temperature system of a thermal power generating unit is regarded as a 2*1 multivariable system, a multivariable predictive controller is designed on the basis of novel performance indexes, and the opening degree of a reheat steam temperature reducing water-spray valve and the opening degree of a smoke baffle are controlled simultaneously. In the performance indexes, on one hand, an algorithm is simplified and rapid control is realized on the basis of requirements on a single-step prediction error and a prediction error change rate, and the control performance of a control system can also be effectively adjusted by adjusting a predictive length and a predictive error change rate weight; on the other hand, dynamic limit on the opening degree of the temperature reducing water-spray valve is added in the indexes, the part of the performance parameters is self-adaptive to changes during a control process, and the amount of temperature reducing water sprayed in reheat steam can be reduced while a reheat steam control quality is improved, thus effectively increasing the cycle efficiency of the unit.

An adjusting device for positioning a load comprises a spindle and a spindle nut which is arranged on the spindle. Either the spindle nut is supported in a gear housing so as to be rotatable and not axially displaceable and the spindle is axially adjustable by rotating the spindle nut for positioning the load, or the spindle is supported in the gear housing so as to be rotatable and not axially displaceable and the spindle nut is axially adjustable by rotating the spindle for positioning the load. The gear housing has blind holes on two oppositely located housing sides and the swivel bearing bushes are pressed into these blind holes for receiving swivel pins.

The invention discloses a wide load high-pressure steam supply system which comprises a steam turbine high pressure cylinder and No. 1, No. 2 and No. 3 high pressure heaters; the high pressure cylinder is connected with the No. 1, No. 2 and No. 3 high pressure heaters through steam suction pipes correspondingly; a check valve and an electric valve are arranged on each steam suction pipe; a suctionand external steam supply pipeline is also arranged on the steam suction pipe for connecting the steam turbine high pressure cylinder and the No. 1 high pressure heater; a No. 1 high pressure heaterwater supply bypass and a No. 2 high pressure heater water supply bypass are provided; heat exchangers are arranged on the two water supply bypasses correspondingly; and water supply pipeline electrically operated gates are arranged on the parts, on the two sides of the heat exchangers, of the water supply bypasses correspondingly. The unit on-load range during high voltage heat supply of a steamturbine is widened, the operation economy of a unit is ensured, and the problem that the heating capacity of high pressure steam of the steam turbine is not sufficient when the unit is subjected to depth peak load regulation is solved.

A brake head positioning means for railcar braking systems. The brake head positioning means is comprised of an attachment means that is engageable with a railcar hanger arm for attaching such brake head positioning means to such railcar hanger arm. An extension means that is engageable with and extends substantially perpendicular to and outwardly from such attachment means is also included. The extension means provides sliding engagement and enables a biasing force to be achieved. Also included is a variable distancing means which is disposed for sliding engagement with and is substantially perpendicular to such extension means adjacent a first end thereof, and is engageable with a brake head adjacent a second end thereof. A biasing means, disposed around and slideably engageable with such extension means for providing a bias to such variable distancing means during service is further included.

The invention belongs to the field of power grid reactive automatic control technique, characterized in that: at the same time of making fixed value control on node voltage of key bus line, using optimization algorithm to make optimization control on voltages of each generator node and reactive compensator nodes to make their set voltages close to the reference values calculated by optimizing power flow so as to assure safe-stable-economic coordinated optimization of voltage of power system.

The invention discloses a virtual power plant day-ahead scheduling method fusing multi-energy demand side resources. The method comprises the following steps: acquiring distributed power generation parameters and day-ahead prediction data, parameters of the multi-energy demand side resources, parameters and historical statistical data of an electric vehicle power battery, an initial operation state and a set operation demand of the multi-energy demand side resources, and power market data; constructing a normal operation mode optimization target of the virtual power plant according to the acquired data, and establishing a multi-operation mode constraint condition of the virtual power plant; and performing optimal solution on the optimization model to obtain an optimal scheduling result of the virtual power plant, and realizing day-ahead scheduling of the virtual power plant. The regulation capability of the demand side resources is fully mined, and the flexible service is provided for the power grid while the operation economy of the virtual power plant is ensured.

The invention discloses a low-vanadium-content wide-active-temperature-window denitration catalyst, which is made from raw materials of 0.05-0.2 by weight of ammonium metavanadate, 0.1-3 parts by weight of ammonium metatungstate or a mixture of 0.1-3 parts by weight of ammonium metatungstate and 0.1-10 parts by weight of ammonium molybdate, 60-80 parts by weight of TiO2, 10-20 parts by weight of an additive, and 15-30 parts by weight of deionized water. Vanadium in the denitration catalyst is controlled at a low content, so that the cost of the catalyst is reduced at a certain degree, and the low vanadium content in the range doesn't cause secondary pollution. Through introduction of the new additive, vanadium in the denitration catalyst is uniformly dispersed, so that vanadium active sites are formed on the surface of the catalyst as much as possible, and the use ratio of vanadium is increased. Furthermore, through introduction of the new additive, the surface acidity and redox performance of the catalyst are improved, thereby improving the performance of the catalyst. The testing result of a pilot-plant test system for simulating industrial smoke and the industrial actual operation of demonstration projects show that the catalyst can well satisfy the operating requirements of variable load conditions in a coal-fired power plant.

A method for additionally conducting the hot air for finishing the articles of clothing (14) along the articles of clothing (14) in counterflow to the transporting direction (13). This leads to more effective finishing of the articles of clothing (14) with greater energy efficiency, and therefore the tunnel finisher according to the invention consumes less energy.

The invention discloses a fuzzy gain scheduling prediction control-based control method for a boiler-turbine coordination system. The control method is an intelligent control method organically combining a nonlinear modeling method, a fuzzy logic reasoning theory and a predictive control technology. Firstly, a multivariable nonlinear discrete dynamic model of the local working condition of the turbine-boiler coordination system is established based on a state space nonlinear modeling method; state variables reflecting dynamic characteristics of the turbine-boiler coordination system are selected as fuzzy scheduling variables, a global multivariable nonlinear discrete fuzzy model of the turbine-boiler coordination system is reasoned according to fuzzy logic; a predictive control technologyis applied on the basis of the model to predict the multi-step output of the model, and control action constraints are considered, and a rolling optimization strategy is implemented. According to themethod, the load can be rapidly tracked in a full working condition range, the constraint optimization problem of a control effect can be solved, the good robustness is achieved while the global optimum of a control system is ensured. The method has important significance in operation optimization of a thermal power generating unit for deep peak regulation.

The invention particularly relates to an optimized operation method considering the mirror field area and the heat storage capacity of a photo-thermal power station, and the method comprises the steps: combining an optimal load reduction model of an electrothermal coupling system and a multi-state reliability model of the photo-thermal power station based on the photoelectric capacity ratio, the heat storage time and the load loss cost of system load reduction of the photo-thermal power station; establishing an optimal configuration model considering the mirror field area and the heat storage capacity of the photo-thermal power station; performing clustering processing on direct solar radiation data, namely DNI data, of the photo-thermal power station through a hierarchical clustering method; and solving an optimal configuration model considering the mirror field area and the heat storage capacity of the photo-thermal power station by combining a particle swarm algorithm with the clustered DNI data to obtain a corresponding model optimal solution result, and applying the model optimal solution result to the optimal operation of the photo-thermal power station. According to the method, the mirror field area and heat storage capacity parameters of the photo-thermal power station are incorporated into operation optimization planning, so that the influence of the parameters of the photo-thermal power station on the overall reliability of the system can be considered on the basis of ensuring the operation economy of the system.

The invention relates to a device and method for measuring the foam mixing ratio of a foam fire-fighting system based on a density method. The device comprises a foam mixed liquid collecting box, wherein the foam mixed liquid collecting box is provided with an ultrasonic liquid level meter and a density meter, the ultrasonic liquid level meter is connected with a plurality of electromagnetic valves arranged on all the most disadvantageous loop headers, each electromagnetic valve is correspondingly connected with a most disadvantageous loop nozzle of the foam fire-fighting system, and when the ultrasonic liquid level meter measures a high liquid level signal of the foam mixed liquid collecting box, the electromagnetic valves are triggered to be automatically closed; and the density meter is connected with the PLC control system, measures the density value of the mixed liquid in the foam mixed liquid collecting box in real time, and transmits data to the PLC control system. According to the invention, the measurement precision of the foam mixing ratio of the foam fire-fighting system can be improved, the manual measurement error is reduced, and the test device has far-reaching significance for avoiding the influence in a conventional test method and improving digital nuclear power.

The invention belongs to the electrical network voltage idle work automatic control technology area, its characteristic lies in while carries on the set point control to the essential generatrix node voltage, through transformation ratio accommodation coefficient using the optimized algorithm adjust the change quantity of on load tap changing transformer, causes the transformation ratio of on load tap changing transformer to the best approach the transformation ratio reference value which is set in the optimized tidal current computation hypothesis, in order to remand the voltage change value of the essential generatrix pitch point, causes the electric power network realize the electrical power system voltage security - stable - economy three coordination control in the movement process under the guarantee security.

The invention discloses a novel cross-sectional structure of an ore carrier. The structure comprises an upper deck, planking and an outer bottom plate, wherein a cargo hold longitudinal bulkhead and acargo hold double-layer bottom are arranged between the upper deck and the outer bottom plate, the amidship postion of a hull has the largest molded breadth which is B meters, the amidship postion ofthe hull has the largest molded depth which is D meters, and the horizontal vertical distance S from the cargo hold longitudinal bulkhead in a deep waterline to the planking is 0.18B meters-0.25B meters; the cargo hold double-layer bottom adopts an upward inclined bottom at the position close to the longitudinal bullhead, and the grade included angle theta between the inclined bottom and the horizontal plane is 35-47 DEG C; and the minimum height H of the cargo hold double-layer bottom is 0.1D meters-0.15 D meters, and the span L of the lowest position of the cargo hold double-layer bottom is0.28B meters-0.65B meters in the ship breadth direction. According to the structure, the requirement on structural strength of the hull under standards and conventions and various loading conditionscan be met, the usage amount of steel and the manufacturing cost of a ship are not increased, the large hold capacity can be effectively provided in the length range of the ship cargo hold, and the good operation economy of the ship is ensured.

The invention discloses a power system based on source network charge storage coordination, include an information interaction bus, A network source load storage coordination control terminal, intelligent substation, distribution stations, equipment layers and load groups, characterized in that: the load group and the equipment layer are bidirectionally connected with each other through wires, thedevice layer is bidirectionally connected with the network source load storage coordination control terminal through a conductor, The network source load storage coordination control terminal is respectively bidirectionally connected with the information exchange bus and the intelligent distribution station through wires. Evaluate the potential of stimulation response of flexible load, accuratelygrasp the cost of stimulation response of flexible load, so as to fully grasp the characteristics of stimulation response of flexible load, establish a refined load power model, make full use of thecomplementary characteristics of various equipment, enhance the control ability, and improve the market competitiveness of products.

The invention discloses a novel pulverized coal boiler low-nitrogen combustion system. The novel pulverized coal boiler low-nitrogen combustion system comprises a coal fine coal mill, an efficient low-nitrogen combustion device with wall attaching wind, a heating face with a catalyst spraying layer, a catalyst with CO catalytic oxidation effect, an online O2 measuring device, an online CO measuring device, an online NOx measuring device, an industrial control machine and the like. On the basis of coal fine low-nitrogen combustion theory combining air/fuel depth graded combustion low-temperature, low-oxygen and long staying time and full-hearth large-space low heat load section balance combustion, through large-hearth model selection design, the low-nitrogen combustion system with the wallattaching wind, economic coal fine fineness, powder making system coordination, wind smoke system cooperation and other new technilogy devices, in combination with ultra-fine coal fine, wind powder conveying precise control, depth air graded low-oxygen combustion process optimized regulation technology and hearth outlet CO catalytic oxidation technology, systematicness and full-process low-nitrogen combustion of the coal fine combustion are achieved, and finally boiler high-efficiency ultra-low NOx emission targets can be achieved.

A deep-graded surface water cooling partially-premixed gas furnace comprises a hearth, wherein a water cooling combustor is arranged at the position of an inlet of the hearth, an annular air supply pipeline is arranged in a burnout area in the hearth, and a reverse flow combustion chamber is arranged at the position of an outlet of the hearth. The deep-graded surface water cooling partially-premixed gas furnace forms oxygen-poor partially-premixed low-temperature surface combustion and oxygen-enriched afterburning, generation of nitric oxides during gas fuel combustion is lowered, and it is guaranteed that gas fuel combustion is clean, uniform, stable and efficient; and meanwhile gas fuel is fully combusted, and therefore the operation economical efficiency of a boiler is guaranteed.