64results about How to "Meet safe operation requirements" patented technology

The invention belongs to the technical field of thermoelectricity, and relates to a 300MW-capacity-level low vacuum heat supply steam turbine system and an adjusting method thereof. The system consists of a 300MW-capacity-level low vacuum heat supply steam turbine generator set and a power plant cold end and heat supply load coupling adjusting system. A steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a steam turbine low-pressure cylinder I, a steam turbine low-pressure cylinder II and a generator are uniaxially arranged in the steam turbine generator set. In the heating period, the back pressure of the two low-pressure cylinders rises, and a steam turbine set runs under low vacuum; steam is uniformly divided into two strands when entering a communicating pipe at the front of the two low-pressure cylinders, so that the flow of each low-pressure cylinder is half the flow of the low-pressure cylinder of the 300MW-capacity-level steam turbine in the prior art, and the flow is greatly reduced; the length of the last-stage blade is shortened, the adjusting range of back pressure is expanded, and the safety of the system is improved; and in the non-heating period, the steam turbine set runs under the straight condensing condition. The invention is applicable for a 300MW-capacity-level combined heat and power steam turbine set to implement low vacuum heat supply.

The invention relates to a DC supply mode of an LED street lamp and belongs to the field of low-voltage power supply and distribution. A DC power supply system comprises a DC power station composed of a street lamp transformer (1), a rectifier filter (2) and a reactive power compensator (3), a DC transmission line, an LED street lamp driving power supply (4) and the like. With the advancement of the LED light source technology, the service life of the light source exceeds 50, 000 hours, the consumption of electric energy is lower than one half of that of a conventional light source, the LED street lamp technology gradually comes into practice, and the LED light source is more and more widely used; the working mode of the conventional LED street lamp is as follows: each lamp is provided with a driving power supply for converting alternating current into direct current, so that the LED light source emits light; the single-phase rectifier, the filter capacitor and the PFC (power factor correction) circuit in the power supply are the bottleneck of popularization and application of the LED street lamp due to shorter service life besides harmonic pollution; and to fully exert the advantages of the LED light source with energy conservation and long service life, the invention provides a solution for DC supply mode of the LED street lamp, electric energy is provided for the LED street lamp by the DC supply mode, and the rectifier bridge, the filter capacitor and the PFC circuit in the conventional power supply are saved, so that the purpose of long-term secure and reliable operation of the LED street lamp is achieved.

The invention discloses a steam and heat supply system for depth thermoelectric decoupling. The steam and heat supply system comprises a main steam pipeline, a steam turbine high pressure cylinder, adecoupling diversion pipeline, a steam increaser decoupling system, a boiler reheater and a steam turbine intermediate pressure cylinder; a power plant main steam pipeline is connected with the decoupling diversion pipeline; the power plant main steam pipeline is connected with the steam turbine high pressure cylinder; the decoupling diversion pipeline is connected with a power steam inlet of thesteam increaser decoupling system; the decoupling diversion pipeline also provides high parameter industrial steam to the outside; a steam exhaust pipeline at the hot end of the boiler reheater is connected with a suction steam port of the steam increaser decoupling system; a steam exhaust pipeline of the steam increaser decoupling system is connected with the cold end of the boiler reheater; andreheated steam exhausted at the hot end of the boiler reheater is connected with the steam turbine intermediate pressure cylinder through an intermediate pressure cylinder steam inlet pipeline. The purpose of depth thermoelectric decoupling is achieved, and industrial steam or heat supply capacity of a unit can be improved substantially.

The invention discloses a novel automatic jet floating type breakwater. The breakwater comprises a base which sinks underwater and a floating body which floats on the water; the base is connected with the floating body by an anchor chain; a water pump is disposed in the floating body; the water inlet of the water pump is arranged on the lower part of the floating body, and the water outlet is arranged on the head sea side of the floating body; a single-chip microcomputer is mounted in the base; a pressure type wave height gauge is disposed on the front of the head sea side of the base; and the single-chip microcomputer is electrically connected with the pressure type wave height gauge and the water pump, and controls the switch on/off and volume of the water pump based on the data from the pressure type wave height gauge. The invention also discloses a wave eliminating method using the novel automatic jet floating type breakwater mentioned above, wherein, the wave elimination is performed by the floating body itself according to the designed wave condition of the breakwater. The novel automatic jet floating type breakwater disclosed by the invention can normally eliminate waves by the floating type breakwater itself, and can jet horizontal flow on the head sea side to enhance wave elimination performance when the single-chip microcomputer detects an extreme wave condition by the pressure type wave height gauge, therefore saves cost and meets the practical needs well at the same time.

The invention discloses a method for polling a power transmission line by using a vertical take-off and landing fixed-wing unmanned aerial vehicle. The method comprises the following steps of performing a calibration test; performing vertical take-off and landing fixed-wing operation data acquisition and data processing; according to the requirement of the safety distance of the power transmission line, analyzing the clearance distance between a lead in the line corridor and the ground surface, vegetation, buildings, cross crossing and the like, and searching for the abnormality and hidden danger of power transmission line facilities and equipment and the threat of a spanned object in the line corridor to the line. According to the method for polling the power transmission line by using the vertical take-off and landing fixed-wing unmanned aerial vehicle, high-precision three-dimensional laser point cloud and high-resolution digital images of the line corridor can be directly acquired, and then the terrain, landform, ground features and line facility equipment space information of the high-precision three-dimensional line corridor, such as a tower, a line hanging point position, a conductor sag and the like, can be obtained; the laser radar point cloud data can automatically extract power line points and perform curve fitting on the power line points to form a continuous and complete power line corridor.

The invention provides a heat exchanger adopted in an experiment, a reactor simulation experimental system and experimental methods of the maximum and minimum passive operation capabilities of a reactor. An experimental device comprises a first reactor and a second loop simulation system. Main equipment comprises a reactor simulator, a steam generator, a main circulation pump, a condenser, the heat exchanger, a water feed pump and a corresponding flow and temperature measuring device. The experimental methods comprise the loop heating and boosting method, the passive operation condition building method, the maximum passive operation capability experimental method and the minimum passive operation capability experimental method. The maximum passive operation capability is determined when the reactor inlet and outlet temperature difference reaches the allowed maximum value, and the minimum passive operation capability is determined when the deviation between two loop steam generator steam yields reaches the allowed maximum value. By adopting the experimental method, the maximum and minimum passive operation capabilities of the reactor coolant system can be obtained, and therefore the application range of the reactor passive operation mode can be obtained.

The invention discloses a synthetic technology of hydroxyethylaniline ester (III). The synthesis process is shown by a chemical equation shown in the description. The technology has the following advantages: 1, the advantage of few instant reaction substances of a micro-channel reactor is used, so the flammable and explosive disadvantages of a hydroxyethylation reaction in a routine kettle are solved, the process safety is increased, and current chemical engineering safety operation requirements are met; and 2, the advantage of high mixing efficiency of the micro-channel reactor is used, the reaction can be carried out under solvent-free conditions when a hydroxyethylation reaction raw material is liquid, and when the excess amount of ethylene oxide is very small, so a reaction solution obtained after the hydroxyethylation reaction ends can be esterified in the micro-channel reactor, serial operation of two-step reactions is realized, and manpower and three wastes are greatly reduced. The technology is a new technology with simplified processes, and accords with environmental protection and safety requirements.

The invention discloses a construction method for an upstream-side wall body of a semi-underground power station plant, comprising a power station plant with a concrete structure, wherein a rear pouring zone is poured along the longitudinal middle line of the upstream-side wall body positioned on the underground part of the power station plant; steel wire meshes are distributed on the contact surface of the rear pouring zone and the corresponding upstream-side wall body; water-swelling water seals are respectively distributed along the longitudinal line of each steel wire mesh; red copper water seal sheets are respectively distributed on the joint of the rear pouring zone and the corresponding upstream-side wall body; multiple layers of butted seam reinforcing steel bars are distributed from bottom to top in the upstream-side wall body and are distributed in a mode of horizontally penetrating through the rear pouring zone; before the upstream-side wall body is poured, a polyethylene closed-cell foam plate is arranged on the outer surface of the upstream-side wall body; drain tanks are distributed along the bottom of the upper outside backfilling groove of the upstream-side wall body; sand-free concrete cushion plies are respectively spread on the bottom and the side surface of the backfilling groove; and concrete blocks are backfilled to the backfilling groove. The semi-underground power station plant built with the construction method has the advantages of simple structure, safety and reliability, low cost, small size of a power station plant structure and the like.

The invention discloses a remote isolation circuit and a braking fault isolation system and method for an unmanned train. The remote isolation circuit comprises an isolation command control switch and an either-or path connection control group connected to the isolation command control switch, wherein the either-or path connection control group comprises an input side and a plurality of output sides; the input side of the either-or path connection control group is connected in series with the isolation command control switch; and each output side of the either-or path connection control group is provided with a connection point so that the output sides of the either-or path connection control group are connected to a device needing to be isolated through the connection points. The remote isolation circuit can accurately and safely realize the remote isolation of the braking fault of a bogie of the unmanned train and meet the safe operation requirement of isolating air brake of only one faulty bogie of the unmanned train, thereby preventing from mistakenly cutting off any bogies or cutting off more than one bogie with braking fault because of a single point of failure in the circuit, and ensuring the safe braking distance and traveling safety of the unmanned train.

The invention discloses a laser cleaning device and method adopting inert gas for auxiliary cleaning. The method comprises the steps that a clamp fixes a sample to be cleaned; a booster pump is started, the insert gas is delivered into a closed cleaning box through a pipeline, and the insert gas is continuously introduced; the moving state of a two-dimensional scanning galvanometer is controlled;laser cleaning is carried out; and after the inert gas is continuously introduced for 15 minutes, the sample to be cleaned is taken out, and laser cleaning is completed. According to the laser cleaning device, through mutual cooperation of an inert gas control device, a laser and a two-dimensional scanning device, parameters such as the laser spot size and laser scanning speed can be adjusted to control the output time and impact force of the inert gas, so that the sample is prevented from being oxidized again in the high-temperature process of laser cleaning, and the more pure sample is obtained; the laser cleaning quality and effect are improved; and the sealed cleaning box is arranged, so that an operator and the reaction space can be well isolated, and the requirement of safe operationis met.

The invention discloses a flame combustion state detection method. Flame area characteristics within a period of time are used as recognition bases. The flame combustion state detection method is usedfor displaying the flame image and state judgment on the Qt graphical interface. A video image is used for recognition, in the actual combustion process of boiler flames, flames will flicker, shake,smoke dust and other interferences. Using image processing, more information can be obtained. The flame area and filtering processing are adopted to improve the anti-noise capacity. The flame combustion condition is judged through video collection, real-time collection and judgment can be achieved, the reliability of the system is improved, faults are prevented to the maximum extent. The operationspeed and the recognition efficiency are improved through offline and online recognition, the whole process of flame work can be detected through video monitoring, online video recognition is adopted, and the system is good in real-time performance and high in safety.

The invention discloses an electrical servo control system for an umbrella-shaped wind turbine, and mainly relates to the technical field of wind power generation. The system involves a monitoring unit, a negative feedback measuring unit, a control unit, a driving unit, a power unit and an execution unit, wherein the monitoring unit is used for monitoring the power output of the umbrella-shaped wind turbine in the operation process to obtain an output value; the negative feedback measuring unit is used for receiving the output value and obtaining a first feedback signal through signal processing, and a driving signal of the driving unit is collected, and a second feedback signal is obtained through the signal processing; the control unit is used for receiving the first feedback signal andthe second feedback signal, and resolving the first feedback signal and the second feedback signal into a control signal; the driving unit is used for receiving the control signal and converting the control signal into a driving signal; the power unit is used for receiving the driving signal, and outputting mechanical energy corresponding to the driving signal; and the execution unit is used for utilizing the mechanical energy for changing the blade angle of the wind wheel. The control method based on the classic control algorithm has the advantages that the power monitoring requirement of thewind turbine generator with the umbrella-shaped adjusting mechanism is met, and the purpose of active power control is achieved.

A method for preparing homogeneous-distribution polyethylene glycol by utilizing a microchannel reactor is disclosed. The method includes (1) a step of preparing a catalytic system, namely a step of subjecting polyol as an initiator and an alkali metal catalyst as a raw material to ultrasonic vibration dissolving; (2) a step of raw material premixing, namely a step of feeding the catalytic systemand epoxy ethane into a premixer at the same time, and premixing the materials at 0-10 DEG C under 0.5-1.0 MPa for 50-500 ms; (3) a micro reaction step, namely a step of subjecting the premixed raw materials to continuous polymerization through the microchannel reactor to obtain a reaction solution, with the reaction temperature being controlled to be 100-200 DEG C, residence time being 2 to 20 min, the reaction pressure being 1.0 to 4.5 MPa; and (4) a step of aftertreatment, namely a step of adding purified water for dissolution at 50-80 DEG C, allowing the solution to pass through an ion exchange resin column, performing filtration and then vacuum dehydration, and cooling a product to room temperature to obtain a polyethylene glycol product. The reaction efficiency is greatly improved, which is very favorable for reducing the price of the homogeneous-distribution polyethylene glycol. The microchannel reactor has no scale effect and is very suitable for industrial scale production.

The invention relates to a bogie frame for a low-floor hinged type railway vehicle and a bogie. The frame is composed of two side beams, a center crossbeam, two end beams and two installation beams. The two end beams are fixed to the two end portions of the two side beams. The two ends of the center crossbeam are fixed to the middle portions of the two side beams. The installation beams are fixed to the outer sides of the side beams. After being welded, the side beams, the center crossbeam and the end beams are of a flat structure overall. The whole structure of the frame is optimally designed, the whole frame is of the flat structure, the limited space between independent wheels can be fully used, the frame is reasonable and compact in structure and small in weight, the height of a vehicle body floor face is greatly reduced, and the use requirement of the 100% low-floor vehicle is met.

The invention discloses a group-based on-line optimization method for optimal power grid topology considering predicted accident sets. Under the constraint of the number of lines allowed to be disconnected, a set of optimal disconnection line scheme considering the mathematical model of the optimal disconnection line with enhanced voltage stability and the predicted accident sets is found. The scheme meets the following conditions: maximizing the load margin of the expected ground-state power system after disconnection, and the load margin of all the predicted accidents and the predicted ground-state power system can meet the threshold requirements and the predicted ground-state power system after disconnection can meet the safe operation constraints. The problem of on-line disconnection line identification of power system voltage stability enhancement control is solved through four stages of evaluation, predicted accident grouping, predicted accident representative disconnection lineidentification, predicted ground-state power system disconnection line identification and verification, and finally the disconnection line scheme meeting the voltage stability load margin threshold ofthe predicted ground-state power system and the predicted accidents sets is given to enhance the static voltage stability of the power system.

The invention belongs to the field of power markets, and more particularly, relates to a monthly centralized matchmaking tradeoff clearing method in consideration of power plant group trading electricity constraints. According to the electricity, the prices and the comprehensive order declared by a power generation enterprise and a power user, a social welfare matrix for a declared price difference between the power generation enterprise and the power user is formed. firstly, power plants in the power plant group are sorted according to quotations from low to high, the power plant quotation meeting the minimum electricity is set to be the lowest limited price, and clearing out is ensured; through traversing the largest elements greater than zero in the social welfare matrix, a matching trading relationship between a power generation enterprise and a power user is formed sequentially, and the pre-traded electricity is acquired; and whether the pre-traded electricity exceeds the maximumtrading electricity limit of the power plant group of the power generation enterprise is further judged, corresponding reduction is carried out in the case of exceeding, the traded electricity is thusin a given limit range, and the trading result is ensured to meet power grid safe operation requirements. The method is high in calculation efficiency and little in implementation difficulty, safetyconstraints can be ensured to be met, and a strong engineering practical value is realized.

The invention relates to an adjustable automated manual hydraulic execution mechanism, which comprises a controlled valve and a hydraulic executer, wherein the controlled valve and the hydraulic executer are respectively connected with a clutch type valve driving device; the hydraulic executer comprises a hollow casing of a left and right penetrating structure; an end cover is arranged at each ofthe left and right ends of the casing; an output angle regulating assembly is arranged at the outer side of the end cover; a rack is arranged in the casing; a Y-shaped sealing ring is arranged at eachof the two ends of the rack; a positioning ring is arranged at the outer side of the Y-shaped sealing ring; a baffle ring is arranged at the outer side of the positioning ring; the upper end of the rack is provided with a gear shaft engaged with the rack; a bushing is arranged at the upper end of the gear shaft; the back end of the gear shaft is connected with a connecting rod; the back end of the connecting rod is provided with a pressure measuring joint; the lower end of the casing is provided with a needle valve assembly and an upper connecting plate; a high-pressure plug is arranged on the upper connecting plate; the upper end of the casing is also provided with a safety valve, a positioning sleeve and a lower connecting plate; the lower connecting plate is fixedly connected with theclutch type valve driving device. The adjustable automated manual hydraulic execution mechanism has the characteristics that the structure is compact; the sealing performance is good; the volumetric efficiency and the reliability are high.

The invention provides a safe inverter DC electric welding machine. A current transformer is connected in series with the output end of a power transistor inverter and the input end of a medium frequency pulse transformer, the output end of the current transformer is connected with a medium frequency rectifier, and the output end of the medium frequency rectifier is connected to a control circuit. The safe inverter DC electric welding machine overcomes the electric shock problem of the prior inverter DC electric welding machine when the electric welding machine is idle, and generates stable arc when the electric welding machine is loaded, thereby satisfying welding requirements of various environments.

The invention relates to a mini-tiller, which comprises a rack. A rear axle, a seat, a steering gear, an engine and a transmission case are arranged on the rack. The rear axle comprises a left bearing sleeve rod, a transverse beam, a connecting mechanism and a right bearing sleeve rod. The connecting mechanism comprises a connecting shaft, a self-lubricating bearing and a connecting sleeve. The connecting sleeve is fixedly arranged in a middle hole in the transverse beam. One end of the connecting shaft is fixedly connected with the rack. The other end of the connecting shaft is rotatably connected with the connecting sleeve through the self-lubricating bearing. Rotary tillage rollers are respectively arranged on the left bearing sleeve rod and the right bearing sleeve rod. A front axle is arranged on the transmission case. The front axle comprises a left driving rod and a right driving rod. Rotary tillage cutter sets are respectively arranged on the left driving rod and the right driving rod. The left driving rod and the right driving rod are hexagonal rods. Each rotary tillage cutter set comprises a hexagonal sleeve rod. The hexagonal sleeve rod is installed on the hexagonal rod and blade fixing plates are evenly distributed on the hexagonal sleeve rod. Rotary tillage blades are arranged on each group of blade fixing plates. The mini-tiller has the advantages that the performance is more perfect, the mini-tiller is simple, convenient and safe to operate, the working stability and reliability are high and the application scope is wide.