81results about How to "Avoid unplanned downtime" patented technology

The invention discloses an industrial device operation state monitoring system which comprises a plurality of industrial devices, data acquisition gateways, security isolation devices and a cloud service platform, wherein the industrial devices are positioned in different areas, and the data acquisition gateways and the security isolation devices correspond to the industrial devices. The data acquisition gateways are used for acquiring operation data of the corresponding industrial devices and transmitting device information to the corresponding security isolation devices, the device information comprises the operation data, area numbers and industrial device numbers, the security isolation devices are used for transmitting the device information to the cloud service platform, and the cloud service platform is used for storing and displaying the device information of the industrial devices in the areas. Manual operation and maintenance cost is reduced by 80%, the industrial devices in global factories realizes centralized cloud operation and maintenance, the global factories can be simultaneously maintained by one operator, programs are updated, all remote operations are maintained, device efficiency is greatly improved by 50%, and maintenance efficiency is improved by troubleshooting and auxiliary diagnosis based on fault early warning of industrial big data.

The invention discloses a high temperature pipeline wall thickness on-line monitoring device. A high temperature pipeline is clamped inside a pipe clamp. Bolts formed in a square shape are connected with the pipe clamp in a welded mode. A stepped type wave guiding rod is arranged in the middle portion of the square-shaped bolts. A cooper sheet is arranged on an end face of the wave guiding rod, facing to one side of the high temperature pipeline. After the bolts and the stepped appearance wave guiding rod penetrate through a pressing board, the bolts and the stepped appearance wave guiding rod are fixed and pressed on a shaft shoulder of the wave guiding rod through nuts. The end face on the other side of the wave guiding rod is provided with an ultrasonic probe and is placed in a water cooled sleeve. The lower end of the water cooled sleeve is in an interference fit with the shaft shoulder of the wave guiding rod. The ultrasonic probe is placed in a center hole of a plunger piston and is sealed. A big hole formed in the upper end of the water cooled sleeve is connected with the plunger piston and a pressing cover. The pressing cover is pressed on an end face of the ultrasonic probe. The ultrasonic probe is connected with an ultrasonic thickness monitoring main machine. The water cooled sleeve is provided with a water inlet and a water outlet. According to the high temperature pipeline wall thickness on-line monitoring device, high temperature thickness monitoring is converted indirectly into low temperature thickness monitoring through the copper sheet and the wave guiding rod, and therefore real time on-line monitoring of the high temperature pipeline wall thickness is achieved, production cost is low and popularizing is easy.

The invention discloses an equipment gas leakage monitoring system and method based on artificial intelligence sense. The monitoring system comprises an artificial intelligence olfaction device, an infrared imaging vision device, an ultrasonic detection auditory device and a mechanical vibration touch device which respectively correspond to four phenomena of gas release, infrared radiation, soundwave diffusion and equipment vibration when the gas leakage of chemical equipment occurs. The gas leakage generation mechanism of the chemical equipment is analyzed; the characteristic rules of gas release, infrared radiation, sound wave diffusion, temperature deviation, equipment vibration and the like caused by an insulating gas leakage fault state are disclosed. Based on the principles of artificial intelligence olfaction, infrared imaging vision, ultrasonic detection auditory sense and mechanical vibration touch sense, an artificial intelligence mode recognition algorithm is used in combination, an intelligent sensory system based on artificial intelligence vision, olfaction, listening and touch information fusion is constructed; and the gas multi-mode leakage accurate recognition of the chemical equipment and a leakage accurate tracing method are obtained. With the system and method of the invention adopted, the problems of gas leakage quantitative identification and leakage positioning are solved.

The invention discloses a liquid pressure nozzle to solve the problems of insufficient mixing depth, large resistance and the like of an alkylation reactor using an existing static mixer, fiber membrane or mechanical stirrer for mixing and distributing liquid concentrated sulfuric acid and iso-butane. The liquid pressure nozzle comprises a main pipe (3), and an inner cavity (4) of the main pipe (3) comprises an upper cylindrical inner cavity and a lower inverted conical inner cavity, Two inlet pipes (1) are arranged on two opposite sides of the main pipe respectively, and an inlet pipe inner hole (2) of an outlet end of each inlet pipe is communicated with the cylindrical inner cavity along the tangential direction of the cylindrical inner cavity. A disturbed flow element (5) is arranged at the top end of the cylindrical inner cavity, a throat (6) is arranged between the bottom end of the inverted conical inner cavity and the top end of a conical nozzle outlet (7), and a disturbed flow groove (8) is formed in a conical surface of the nozzle outlet and surrounds the axis line of the main pipe. The liquid pressure nozzle is mainly used for mixing, atomizing and distributing the liquid concentrated sulfuric acid and the iso-butane in the alkylation reactor.

The invention provides a control method of an air conditioner, a control device of the air conditioner and the air conditioner. The control method of the air conditioner comprises the step that the opening of an electronic expansion valve is adjusted when the starting capacity of an indoor machine is less than or equal to a capacity threshold valve and a low pressure protection signal is received.According to the technical scheme, the control method and device of the air conditioner and the air conditioner can avoid the shutdown of the air conditioner caused by the low voltage protection signal misinformation due to the small operating load of the air conditioner and the low opening degree of the electronic expansion valve when the opening capacity of the indoor machine is small, the frequent error shutdown when the opening capacity of the indoor machine is small is avoided, the reliability of the air conditioner is improved, and the comfort of users to use the air conditioner is further improved.

The invention provides a method and device for determining abnormal variable pitch of a fan and a fan control system. The method for determining the abnormal variable pitch of the fan comprises the following steps of (A) determining whether a pitch angle detected by a main encoder of a preset blade of the fan is within a preset range; (B) determining whether a detection result of a blade detectiondevice of the preset blade satisfies a preset condition in response to the fact that the pitch angle detected by the main encoder for the preset blade is within the preset range; (C) acquiring the blade parameters of the preset blade in response to the fact that the detection result of the blade detection device of the preset blade satisfies the preset condition; and (D) determining whether the variable pitch of the preset blade is abnormal or not based on the acquired blade parameters of the preset blade.

The invention discloses an artificial environment control system with an ultra-micro unmanned aerial vehicle and an operation method of the artificial environment control system. The system comprisesa temperature and humidity sensor, an ultra-micro unmanned aerial vehicle, the unmanned aerial vehicle lifting platform, an intelligent control center, a remote jet nozzle, an air supply outlet, a radiant heating and cooling system, an active cold beam, a moisture absorption device, an air purifier, an all-air system, a fan coil system and a fresh air system; a temperature sensor, a humidity sensor, an infrared radiation temperature sensor, a wind speed sensor and an air quality sensor are arranged on the ultra-micro unmanned aerial vehicle; and the system further discloses an operation methodof the artificial environment control system with the ultra-micro unmanned aerial vehicle. The multi-parameter movable type measuring technology and comprehensive air conditioner tail end equipment are adopted, the indoor environment can be accurately controlled, the human body heat comfort degree of indoor personnel is remarkably improved, the heat preservation fault diagnosis of the air conditioning system, the air supply system and the enclosure structure can be carried out.

The invention provides an air discharge monitoring system, relating to the technical field of air discharge equipment monitoring in the industrial and technical processes. In the prior art, when an air duct of a present air discharge monitoring system of technical equipment is blocked and the like, the air quantity and the absolute wind pressure are not within normal work ranges even if the wind pressure can still reach a set value, the system has faults, and production is influenced. The air discharge monitoring system of the invention comprises a driving layer device and a processing layer device, wherein the driving layer device is used for air discharge, and the processing layer device determines whether a present pipeline is normal according to relation among working parameters of the driving layer device, and emits an alarm signal when the pipeline is abnormal. Thus, reliable wind-pressure-constant control is realized; and when the wind pressure is still maintained when the air duct is blocked in the production process but cannot satisfy normal work of production equipment, the air charge monitoring system can realize remote alarm, notify related staff of taking measures timely, and thus, avoid the production equipment from unplanned shutdown to the large extent.

The invention provides an intelligent diagnosis system and method for online fault monitoring of an efflux pump unit. The diagnosis system comprises the efflux pump unit, an acquirer, a multi-port repeater, a local monitoring unit and a remote monitoring unit, wherein the efflux pump unit comprises a motor and an efflux pump which are connected with each other; a vibration detection composite sensor is arranged on the efflux pump and is electrically connected with the acquirer; and the acquirer, the local monitoring unit and the remote monitoring unit are electrically connected with the multi-port repeater. By the intelligent diagnosis system and method for online fault monitoring of the efflux pump unit, the problems that an efflux main pump unit of an oilfield does not have a special online fault monitoring intelligent diagnosis system, vibration exceeds the standard for a long time, the efflux main pump unit is unsafe, electric energy is wasted, and shutdown is easily caused to result in loss are solved.

The invention discloses water treatment technology for a circulating cooling water system of vehicle body welding technology, which comprises: agent-feeding treatment of circulating cooling water; arrangement and maintenance of a bypass filter; pollution discharge in workshops; and control of the water quality of the circulating cooling water. The method comprehensively solves the problems of corrosion of pipelines, sedimentation and microorganism reproduction, blockage and damage of welding equipment and so on caused by various defects in the prior circulating water treatment, guarantees long-term stable operation of the system, and maintains the heat exchange efficiency of a heat exchanger, so as to prevent unintended shut-down and prolong the service life of the equipment.

The invention discloses a method for on-line monitoring the running state of a hot rolling edging mill which is driven by a motor comprising a sliding bearing and a rolling bearing and a speed reducer. The method comprises the steps of arranging a vibration sensor on a bearing seat, collecting an original signal is, carrying out frequency spectrum analysis on the original signal, extracting the vibration amplitude values of the motor, the sliding bearing, the speed reducer gear and the rolling bearing through signal reconstruction; carrying out data preprocessing, performing normalization processing on the vibration amplitude data, and setting a standard sample and a sample to be detected according to the vibration amplitude of the rolling mill, and calculating the health degree of the sample to be detected; setting the operation state health index H of the rolling mill to be calculated by a standard sample and the sample to be detected, the standard sample being 1, the to-be-detectedsample being normalization processed vibration amplitude values; setting an alarm threshold value of H, and an on-line monitoring system respectively forecasting normal, light faults or heavy faults of the rolling mill according to the alarm threshold value. According to the method, the health degree index is used for evaluating the degradation trend of the running state of the rolling mill, and the normal and reliable operation of the equipment is supported.

The invention discloses an explosion-proof and safety-increased type composite explosion-proof motor with a current transformer. An annular junction box support is welded on the base of an explosion-proof motor body. The annular junction box support is provided with an explosion-proof cover plate. The explosion-proof cover plate is connected with a safety-increased type current transformer junction box via a terminal box base. The explosion-proof cover plate is provided with an explosion-proof cable joint. The terminal box base, the explosion-proof cover plate, the explosion-proof cable joint and the base together form an explosion-proof housing of the motor. In this way, through arranging the current transformer as a measurement element on the explosion-proof motor body for realizing the differential protection, the interphase short-circuit protection function is effectively realized. Therefore, the security level of the explosion-proof motor is effectively realized. The motor is simple in structure, convenient to install and maintain, good in security and reliability and high in explosion-proof level. The technical scheme of the invention can be effectively applied to the explosion-proof motor with the power thereof larger than 2000 kW. The cost of the motor is greatly reduced.

The invention discloses a bearing vibration monitoring system. The system comprises a bearing, a supporting sleeve, vibration sensors, an electronic diagnosis module, an industrial personal computer,a PLC, a display terminal, an alarm device and a storage device, the bearing is installed on a gear shaft, the gear shaft is installed in an inner hole of the supporting sleeve, and the vibration sensors are connected to the horizontal direction and the vertical direction of the supporting sleeve respectively to collect vibration data of the bearing; the vibration sensors transmit signals to the electronic diagnosis module, and the electronic diagnosis module outputs a real-time vibration spectrogram by processing the signals or outputs the signal to the PLC by signal processing; the PLC can display real-time data of bearing vibration on the display terminal through signal processing and trigger the alarm device to respond when a monitoring value exceeds a set value. The storage device cancall operation data for comparative analysis. Damage of parts can be avoided, accidental shutdown is prevented, the service life of equipment is prolonged, and the maintenance cost is reduced.

The invention belongs to the detecting system technical field, relating to a real time monitoring system of a hydrogenation reaction exudate cooling process. The system comprises the following functional modules that: a data fetch module, a data preprocess module, a data manual input module, a model modeling module, a critical characteristics index computation module, a diagnostic module and a real time display module. A user can realize all the functions of fetching data, diagnosing data, and real time displaying data by the system without adding any extra operations. The system can diagnose the specific reaction exudate system in real time effectively. The unserviceable control parameters in the varying duty operation of a specific REAC system can be displayed real time by monitoring various parameters of a reaction exudate air cooler, thereby providing the reliable working condition and various unserviceable control parameters information for site work personnel, effectively avoiding the unscheduled stoppage of the REAC system and improving the security, the stability and the long-time operation of the REAC system substantially.

The invention provides a PHM system of fully mechanized coal mining equipment. A performance evaluation module is used for constructing a verification evaluation model; a simulation experiment moduleis used for building a simulation experiment verification platform; a PHM cloud sharing verification module is used for building a PHM cloud sharing verification platform; a model construction moduleis used for determining a multi-type accurate life prediction model and a maintenance decision model; and a result verification module is used for outputting a verification result. The beneficial effects of the system are that the system covers all contents of fault diagnosis through a fault prediction and health management (PHM) system, adds a fault prediction and maintenance decision technology,and improves the usability, start-up rate and production efficiency of the system through the prolonging of a maintenance period and the timely maintenance activity; through predictive maintenance and accurate maintenance, the fault shutdown time and the accessory inventory period, the maintenance cost is remarkably reduced, and the production efficiency is improved; and finally, the full-life-cycle cost of the product is reduced, the maintenance workload is reduced, and labor and efficiency are improved.

The invention provides a redundancy control circuit and a redundancy control system and aims to solve the problems that as unstable factors in a cooling water system in the prior art cause abnormal cooling water supply, an air compressor system shuts down due to sharp raise of temperature, and the heavy losses of a production line is caused. The redundancy control circuit comprises a first branch circuit, a second branch circuit, a third branch circuit, a fourth branch circuit, a fifth branch circuit, a sixth branch circuit, a seven branch circuit and an eighth branch circuit, wherein the first branch circuit is connected with the second branch circuit in parallel, then is connected with the eighth branch circuit in series, then is connected with the third branch circuit and the fourth branch circuit in parallel, and then is connected with the normally closed contact (KH01) of a first thermal relay in series to form a first loop; the fifth branch circuit is connected with the sixth branch circuit in parallel, then is connected with the normally opened contact (KH02) of the first thermal relay in series to form a second loop; the first loop, the second loop and the seventh branch circuit are connected into a power supply main circuit in parallel. The scheme provided by invention is low in cost and safe and reliable, solves the problem that a cooling water pump and an electronic control system go wrong in the running process of an air compressor, and avoids the unplanned shutdown of production equipment.

The invention discloses a novel coal quality online detection device and analysis method designed for a coal feeder. Main element contents and industrial analysis indexes of coal on the coal feeder can be online detected. By installing a pulsed neutron method coal quality online analyzer on the coal feeder, the online detection of combustor outlet coal quality is truly achieved, data accuracy is far higher than the accuracy of predicted coal quality data, the most accurate direct basis is provided for guiding the adjustment of boiler combustion parameters, boiler efficiency is improved by 0.1%, and meanwhile boiler safety is improved.

The invention discloses a beam-pumping unit motor fault prediction device which comprises an electrical parameter data acquisition module, a data analysis and processing module, a data storage module, a communication module and a power supply module. The electrical parameter data acquisition module is used for acquiring electrical parameter data of a driving end in real time; the data analyzing and processing module is used for analyzing and processing the collected electrical parameter data, extracting key characteristic indexes, diagnosing fault information of the motor of the oil pumping unit and carrying out fault prediction; the data storage module is used for storing the collected data and the data in the processing process of the data analysis processing module; the communication module is used for sending the fault information of the pumping unit motor and the fault prediction result to the upper computer; and the power supply module is used for providing matched voltage for each module. According to the invention, the problem that the fault of the pumping unit motor can be found as soon as possible under the condition that the regular maintenance of the pumping unit motor is insufficient can be solved. By collecting the electric parameter data of the upper stroke and the lower stroke, the running state of the motor is monitored continuously in real time, and the significance of predictive maintenance is achieved.

The invention discloses a selective laser melting 3D printing production line system and a control method, and relates to the field of additive manufacturing. The selective laser melting 3D printing production line system comprises powder supply devices, powder feeding cylinders, powder collecting cylinders and a plurality of 3D printers; the powder feeding cylinders are sequentially arranged on the upper portions of all the 3D printers, the powder collecting cylinders are sequentially arranged on the lower portions of all the 3D printers, and the powder supply devices are separately connected with each powder feeding cylinder and each powder collecting cylinders. According to the selective laser melting 3D printing production line system and the control method, centralized powder supply and stable operation can be achieved, and the effect of saving powder is achieved.

The invention relates to a drive chain, in particular a conveyor chain for industrial systems, comprising a plurality of chain links, which are connected together via respective chain joints. A chainpin extends through a joint opening in the direction of a joint axis of the chain joint in order to form the chain joint. The conveyor chain also comprises a sensor for detecting chain wear. At leastone chain pin of the drive chain has a recess, and the sensor for detecting chain wear is arranged in the recess. The invention additionally relates to a chain pin and to a method for detecting chainwear of such a drive chain.

The invention discloses water treatment technology for a circulating cooling water system of vehicle body welding technology, which comprises: agent-feeding treatment of circulating cooling water; arrangement and maintenance of a bypass filter; pollution discharge in workshops; and control of the water quality of the circulating cooling water. The method comprehensively solves the problems of corrosion of pipelines, sedimentation and microorganism reproduction, blockage and damage of welding equipment and so on caused by various defects in the prior circulating water treatment, guarantees long-term stable operation of the system, and maintains the heat exchange efficiency of a heat exchanger, so as to prevent unintended shut-down and prolong the service life of the equipment.

The invention relates to a control method of a multi-split refrigerating and freezing unit and the multi-split refrigerating and freezing unit using the control method. The control method comprises the steps that the starting number of indoor units of the multi-split refrigerating and freezing unit is obtained; and based on the starting number of the indoor units, a compressor is controlled to enter a mistaken stop prevention mode or a normal stop mode. According to the method, the compressor is controlled to enter the mistaken stop prevention mode or the normal stop mode based on the starting number of the indoor units, and the situation that the compressor is mistakenly stopped when the refrigeration requirement of the indoor units is not met yet can be effectively avoided.

A mining flame-proof intelligent three-phase asynchronous motor comprises a base, an enclosure, a junction box, a front outer cover, a front end cover, a front inner cover, a first assembling bearing,a rotating shaft, a rotor, a stator, a rear outer cover, a rear end cover, a rear inner cover, a second assembling bearing, a stator outgoing line and a motor intelligent control device, the base ismounted at the bottom of the enclosure, the junction box is mounted on the enclosure, the first assembling bearing is mounted on the front end of the rotating shaft, the second assembling bearing is mounted on the rear end of the rotating shaft, the stator outgoing line is introduced into a cavity of the junction box from a stator winding, the motor intelligent control device is mounted in the junction box and is mounted with the stator outgoing line, and the motor intelligent control device is used for displaying the running state of the motor in real time. By adoption of the mining flame-proof intelligent three-phase asynchronous motor provided by the invention, real-time display of the motor running state, local intelligent early warning protection and remote monitoring control protection are realized, the motor running state is updated in real time, and real-time monitoring, fault diagnosis and maintenance service are provided for coal mine enterprises according to an early warninglevel.

The invention relates to a material adding system. The material adding system comprises a container, a gyroscope, a sensor, an execution mechanism and a controller, wherein the container is used for storing materials to be supplied outwards, and does reciprocating circular motion around a preset axis when the material adding system works; the gyroscope is used for measuring the inclination angle of the container; the sensor is installed on the container and is used for outputting signals showing the situations of detecting or not detecting the materials when the materials exist or do not existin the sending range of the sensor; the execution mechanism can be used for filling the materials into the container; and the controller is coupled to the gyroscope, the sensor and the execution mechanism, is used for, based on the signal output by the sensor, judging whether the current remaining quantity of the materials in the container is smaller than a specified number threshold value or notwhen the inclination angle of the container measured by the gyroscope reaches a preset angle, and is used for promoting the execution mechanism to add a preset quantity of materials into the container when the judgment result is positive. According to the material adding system, material waste and out-of-plan shutdown can be reduced or avoided.

The invention discloses a tube push bench rack electric control protection circuit and a protection method thereof. The protection circuit comprises a power consumption braking circuit, an excitationpower supply redundancy circuit, a PLC system redundancy circuit and a UPS circuit. The invention discloses the protection circuit used after abnormal power failures of a tube push bench rack and theelectric control parking protection method; and according to the method, a new electrical control idea is adopted to prevent the tube push bench rack from running out of control after a sudden power failure happens in the movement process, and corresponding programs are designed in a targeted manner according to various possibilities of various component damage and power failures through perfect backup power supply and element redundancy design. The technology can effectively solve unplanned shutdown caused by any reason, the rack can be subjected to controlled stopping stably and reliably, and the purpose of run-away accidents is achieved.

The invention discloses a vertical type air conditioner. The vertical type air conditioner comprises a base and air conditioner bodies arranged on the base, wherein each air conditioner body comprises a housing and a drainage air flue formed in the housing; housings of the adjacent air conditioner bodies are arranged in a spaced mode; an air inlet and an air outlet are formed in each housing; a cross-flow fan and a heat exchanger are arranged in each housing; each air inlet, each heat exchanger, each cross-flow fan and each air outlet are sequentially arranged in the corresponding drainage air flue in the air flowing direction; a penetrating air flue is formed between the housings of the adjacent air conditioner bodies; induced air in the drainage air flues and air in the penetrating air flue are mixed in the penetrating air flue and are fed to a specified area of an air conditioner room; heat exchangers in the adjacent two air conditioner bodies communicate with each other at a concentration point; the concentration point is positioned on the first plane on which the longitudinal middle axis of the penetrating air flue is located; the first plane extends in the penetrating air flue in the air flow flowing direction; an electronic expansion valve is further arranged between the heat exchangers and the concentration point; and a coil tube temperature sensor is arranged on each heat exchanger. The invention further provides a control method for the vertical type air conditioner. The vertical type air conditioner has the advantages of being good in air-conditioning effect and flexible to use.

The invention discloses an automatic shutdown method of an electric motor towing turbine unit in failure of a controlling system and an oil system. A normally opened pressure switch is arranged on a lubricating oil supplying main pipe of the electric motor towing turbine unit, and when the pressure of the lubricating oil is as low as the preset value, the contact of the pressure switch is closed. A pressure switch normally closed contact of the lubricating oil supplying main pipe and a number 1 and number 2 lubricating oil pump motor alternating current contactor normally closed auxiliary contact which are sequentially connected in series are connected into a high-voltage control loop 220-V direct current power supply together with a tripping mechanism of a vacuum breaker to form a safe shutdown control loop. When the safe shutdown control loop is closed, the tripping mechanism of the vacuum breaker in an operation cabinet of the electric motor towing turbine unit is powered on, and the electric towing turbine unit is shut down in interlocking mode. Safe shutdown of the electric towing turbine unit is ensured when the control system and the oil system are failed, and the phenomenon of wrong shutdown caused by wrong operation of the alternating current contactor normally closed auxiliary contact of the pressure switch contact of the lubricating oil supplying main pipe or a lubricating oil pump motor is avoided.

The invention discloses an inertia energy control method, device and equipment for a variable-speed constant-frequency wind turbine generator and a computer readable storage medium. The method comprises steps that a Cp-lambda scatter distribution array is obtained according to operation data of the wind turbine generator; a Cp-lambda curve of the unit in the inertial energy supporting process is obtained; delta Eaero is obtained according to the Cp-lambda curve and the aerodynamic power of the unit in the inertial energy supporting process; delta Ee and delta Eloss of the unit in the inertia energy supporting process are calculated, delta Ekic is obtained according to the rotating speed constraint, and the supporting time of the unit in the inertia energy supporting process is obtained according to the formula delta Eaero-delta Ee-delta Eloss-delta Ekic=0; when the power support time of the unit reaches the support time, the unit is controlled for quitting the inertial energy support process. The method is advantaged in that the supporting time of the unit in the inertia energy supporting process is calculated according to the actual operation condition of the unit, and the unit iscontrolled according to the supporting time, so the unit can play a maximum supporting role, the good power grid supporting effect is achieved, and accidental shutdown of the unit is prevented.

The invention discloses an LNG cold energy comprehensive utilization system comprising an LNG storage center, an air separation system, a nuclear electricity generation system, a cold storage system and a gas supply pipe network. Two branches extend from the outlet end of the LNG storage center. The first branch is connected with the air separation system, and the second branch is connected with the nuclear electricity generation system. LNG in the LNG storage center conducts heat exchange through the air separation system and the nuclear electricity generation system correspondingly and thenenters the cold storage system. The LNG existing after heat exchange conducts heat exchange again with the cooling work medium of the cold storage system, then is fed into the gas supply pipe networkand is connected with gas users through the gas supply pipe network. The air separation system is used for obtaining liquid CO2. According to the LNG cold energy comprehensive utilization system, by means of the air separation system, the nuclear electricity generation system and the cold storage system, gradient utilization of LNG cold energy is achieved, energy waste caused by single use is avoided, the energy utilization rate is high, and the applicability is high; the LNG is used as cooling protection of the nuclear electricity generation system, so that safety and reliability are achieved; and meanwhile, the LNG cold energy comprehensive utilization system further has the features of being compact in structure, saving energy and being environmentally friendly.

The invention discloses a monitoring method for preventing repeated shutdowns of vibroflots. The method includes the steps that a current and / or voltage monitoring device is arranged on each working vibroflot to measure working current I1 and / or working voltage U1 of the vibroflots; a monitoring terminal is arranged, and a wireless receiving and sending unit is arranged on each working vibroflot, wherein the working vibroflot is in wireless communication with the monitoring terminal through the wireless receiving and sending unit; the monitoring terminal is provided with a primary processing unit and a secondary processing unit, and all the working vibroflots transmit information to the monitoring terminal through the wireless receiving and sending units and then are communicated with the primary processing unit and the secondary processing unit. According to the monitoring method, whether the shutdowns of the vibroflots are really needed is recognized by the primary processing unit first, and therefore faulty shutdowns and the repeated shutdowns, caused by incorrect monitoring, of the vibroflots can be avoided.