52results about How to "Improve safety and economy" patented technology

Shallow drilling hazards (44), such as karsts, caves, voids and unconsolidated discontinuities, that can pose significant risks to exploration and development well drilling operations are detected employing seismic refraction data on which a series of attribute analyses are performed, the resulting data being further processed to provide a three-dimensional visualization. Refracted wave raypaths (40, 46, 48) are highly distorted by encountering a karst feature with the occurrence of backscattering absorption. The resultant energy recorded at the surface receivers (52) is significantly reduced as compared to refracted waves recorded by other receivers (50) where no karsting is present. Multiple refractors are subjected to a relatively simple and rapid processing using commercially available software to track these differences and to map them in the near surface to improve the siting of wells and to alert drilling engineers and crews to the possibility of encountering the hazard.

Shallow drilling hazards (44), such as karsts, caves, voids and unconsolidated discontinuities, that can pose significant risks to exploration and development well drilling operations are detected employing seismic refraction data on which a series of attribute analyses are performed, the resulting data being further processed to provide a three-dimensional visualization. Refracted wave raypaths (40, 46, 48) are highly distorted by encountering a karst feature with the occurrence of backscattering absorption. The resultant energy recorded at the surface receivers (52) is significantly reduced as compared to refracted waves recorded by other receivers (50) where no karsting is present. Multiple refractors are subjected to a relatively simple and rapid processing using commercially available software to track these differences and to map them in the near surface to improve the siting of wells and to alert drilling engineers and crews to the possibility of encountering the hazard.

The invention discloses a method for simultaneously removing sulfur, niter and mercury from smoke based on catalytic oxidation. The method is characterized by comprising the following steps of: (1) arranging a catalytic reactor in a dust-removed smoke duct, wherein a catalyst for promoting oxidizing reaction of NO and HgO is filled in the catalytic reactor; (2) allowing the dust-removed smoke to pass through the catalytic reactor, wherein under catalysis of the catalyst, the reaction speed of the NO, the HgO and O2 is increased and the NO and the HgO are oxidized into NO2 and Hg<2+>; and (3) introducing the smoke subjected to catalytic oxidation into an absorber with an absorption solution, wherein the absorption solution is used for absorbing NO2, Hg<2+> and SO2 from the smoke. The invention also discloses a system applicable to the method. According to the method and the system, the sulfur, the niter and the mercury are removed from the smoke; external oxidant is not required to be added; preparation, transportation and storage of strong oxidant are avoided; operating cost is reduced; and economy and safety of the system are improved.

The invention discloses a hub-type robot system for autonomously detecting road surfaces. The hub-type robot system comprises a robot body and a remote-monitoring auxiliary system, wherein information is transmitted between the robot body and the remote-monitoring auxiliary system by a wireless communication mode; the robot body is provided with a control system, a non-destructive detection system and an operation mechanism; the operation mechanism is arranged on the robot body; the non-destructive detection system is connected with the operation mechanism; the control mechanism is electrically connected with the operation mechanism and the non-destructive detection system; the non-destructive detection system comprises a resistivity instrument; the operation mechanism comprises a telescopic mechanism; the resistivity instrument is connected with the telescopic mechanism; an independently driven steering device is arranged at the bottom part of the robot body. The invention also discloses a road-surface detecting method. By adoption of the hub-type robot system disclosed by the invention, intelligent detection can be realized; due to no need of manual driving, the detection safety and the accuracy of data detection are improved; multiple non-destructive detection sensors are integrated into one, comprehensive evaluation on the road surfaces and the internal conditions can be realized, the detection efficiency is greatly improved, and the influence on the road trafficability is also reduced.

The invention discloses an optimal power flow solvability identification method of an electric power system; the method translates the problem of looking for a feasible point of the optimal power flow into the problem of obtaining a stable point of a differential dynamic system, thus simplifying the complexity of the primal problem; the stable point of the differential dynamic system can be effectively and rapidly obtained by using a pseudo-transient continuation method; the optimal power flow solvability identification method can greatly improve the economical efficiency and safety for operating the electric power system.

The invention discloses a wire-rope / pulley component which comprises a first pulley block, a second pulley block and a wire rope passing through the first and the second pulley blocks, wherein the wire rope passes alternately through individual pulleys in the first and the second pulley blocks, and the head end and the tail end of the wire rope are positioned on the same side of a pulley shaft. The interference between the wire rope of the wire-rope / pulley component and a lifting hook side plate is eliminated, so that the service life of the wire rope is increased and thus the safety and economy are significantly improved. The invention also discloses a crane provided with the wire-rope / pulley component.

The invention relates to pre-reinforcement projects for a tunnel-slope system, and provides a pre-reinforced composite structure for a tunnel longitudinally penetrating through slope and an implementation method thereof. The pre-reinforced composite structure comprises surface grouting, a surface anchor cable frame, a tunnel lining, grouting in tunnel and lining anchor cables. The implementation method of the pre-reinforced composite structure comprises the following steps of: based on engineering geology investigation results and geomechanical model recognition of the tunnel-slope system, determining the space layout form of the pre-reinforced composite structure, arranging surface grouting and the surface anchor cable frame firstly on the surface of the tunnel-slope system, arranging grouting in the tunnel as required, arranging bearing steel bars on the tunnel lining and pre-forming anchor cable holes for arranging the lining anchor cables. The implementation of the pre-reinforced composite structure provided by the invention can effectively reinforce the tunnel-slope system, thereby improving the stability of the slope and the self-bearing capacity of the tunnel surrounding rock, and ensuring the safe transport operation of the tunnel.

The invention relates to and particularly discloses a method for improving measuring precision of a thermal resistance thermometer. The method comprises the following steps that 1, m points are selected within the measuring range of one thermal resistance thermometer as temperature correction datum points, and the output temperature value of the nth datum point is Yn; 2, the resistance value Rn of the nth temperature correction datum point is collected according to the data table of the thermal resistance thermometer; 3, an input temperature value Xn corresponding to the nth temperature correction datum point is acquired; 4, m-1 temperature intervals are formed by the m temperature correction datum points, and when a temperature value Ti measured by the thermal resistance thermometer is within the ith temperature interval, the gain Ai and polarization Bi of the ith temperature interval are obtained according to the step 3; 5, the temperature value Ti measured by the thermal resistance thermometer is calibrated and corrected, and a calibrated and corrected temperature value Ti' is obtained. According to the method, the measuring precision of the thermal resistance thermometer of a nuclear power plant is improved, the error of a whole temperature measuring channel is lowered, and the safety and economical efficiency of the power plant are improved.

The invention discloses a method and a device for identifying the output feasible region of a virtual power plant based on constraint aggregation, and relates to the technical field of power system dispatching and operation. The method comprises the following steps: acquiring basic operation data of the internal power distribution system of the virtual power plant; a static safety constraint modelof the virtual power plant based on an AC power flow equation is constructed according to the basic operation data of the internal distribution system of the virtual power plant; the output feasibleregion model of the virtual power plant is constructed according to the static safety constraint model of the virtual power plant; and the feasible region model of the virtual power plant output is calculated according to the basic data of the internal distribution system of the virtual power plant and the enumeration algorithm of the feasible region vertex so as to obtain the output feasible region of the virtual power plant. The method can characterize the output feasible region of the virtual power plant allowed for safe operation so that the virtual power plant can participate in the optimal dispatching operation of the power system and the clearing of the spot power market, the dispatching and clearing results are ensured not to violate the internal safe operation constraints of the virtual power plant and thus the safety and economy of the system can be improved.

The invention discloses a steam turbine low-pressure through-flow area safety monitoring and prewarning system and a working method. Data is acquired through a flow area air blowing monitoring module,a long blade vibration monitoring module, a blade water erosion water brush prewarning module and an optimal operation boundary adjusting module; and after intercommunication, target unit safety boundary data and optimal safety operation boundary are generated in a safety estimating module and the optimal operation boundary adjusting module to prompt safe and economical adjustment of an unit. Themethod is suitable for steam turbine low-pressure through-flow area safety monitoring and prewarning in operation of a deep peak adjusting unit under part-load working condition, can accurately, comprehensively and effectively predict the low-pressure through-flow area long blade air blowing critical steam inlet flow and the air blowing high-temperature area position in deep peak adjustment, canfinely monitor the long blade vibration stress peak magnitude, can prospect and prewarn the water erosion state of final-stage blades, and achieves further optimization to give the safety operation boundary to the unit.

The invention provides a wind power-thermal power cutter strategy coordination optimization method. The method comprises the following steps that: step one, when a fault occurrence of the system is monitored, calculation is started to obtain a transient energy function of a wind power-thermal-power bundling system after the fault so as to determine whether the system is unstable; if so, the step two is executed; and if not, the cutter measure is not taken; step two, according to transient energy functions of thermal power generating units, whether any thermal power generating unit itself is unstable is determined; if so, the thermal power generating unit that is unstable is cut off and then the step one is executed; and if not, the step three is executed; step three, on the basis of the delivery power scale of the wind power-thermal-power bundling system before the fault and the delivery capacity limit of the power transmission channel after the fault, the thermal power generating unit capacity needing to be cut off is calculated; and after the cutter operation is completed and operation returns to the step one. According to the method provided by the invention, secure and stable operation of the wind power-thermal-power bundling delivery energy base station after the fault can be effectively guaranteed; the cutter capacities of the wind power and the thermal power are distributed reasonably; the effect of lost power generation capacity minimization is realized; the favorable conditions are created for system recovery after the fault; and the security and economy of the system are improved.

The invention relates to a cooling and purifying system of a spent fuel pool. The cooling and purifying system is arranged in the spent fuel pool, and comprises a cooling structure (5) formed at the upper part of the spent fuel pool; and the cooling structure (5) is parallel to a vertical direction of a pool wall. According to the system provided by the invention, all main processes for storing spent fuel and maintenance operation can be completed in the spent fuel pool without moving and circulating a water body inside the spent fuel pool, so that risks of diffusion of radioactive matter and losing of cooling of the stored fuel are reduced, and the security and the economical benefits of fuel storage are greatly improved. Furthermore, the system can realize a foam bypass function of the surface of the spent fuel pool simultaneously.

The present invention discloses a method for establishing an air pre-heater clean factor calculation model by using smoke pressure difference, and the method includes: converting an actual measuring pressure difference under conditions of different loads and an excess air coefficient into calculated values under conditions of rated loads, and further establishing the air pre-heater clean factor calculation model. The present invention also discloses an application of the above calculation model to monitoring of fouling conditions of the air pre-heater of a coal-fired boiler SCR denitrification system. According to a formation principle of fouling of the air pre-heater of the SCR denitrification system and a growth form, a fouling monitoring model of the air pre-heater of the denitration boiler is established, wherein the fouling monitoring model integrates data collection, fouling condition monitoring, and diagnosis. The method provided by the present invention can accurately predict fouling conditions of the air pre-heater, meet accuracy requirement of engineering application, guide a soot blower to blow soot timely, eventually achieve demand soot blowing of tail heating surface, improve economy and safety of generator operation, and can provide a technical reference for domestic same-type generators.

The invention discloses a metal-solid acid double-center catalyst and an application thereof in catalyzing dehydration-hydrogenation of xylose to prepare furfuryl alcohol. The catalyst comprises an acid center and a metal center, the acid center is sulfonated and modified graphene with a two-dimensional planar structure, and the metal center is metal Ru with higher C=O-based hydrogenation activity. The loading capacity of the metal in the catalyst is 0.5 wt%-5wt%, and the mass percent of the sulfonated graphene is 95%-99.5%. The used metal-solid acid double-center catalyst shows excellent catalytic performance in catalyzing xylose to directly prepare furfuryl alcohol through a dehydration-hydrogenation one-step method; effective coupling of acid catalysis and hydrogenation reaction is realized, the economy and safety of the method are improved, the reaction is simple, the catalyst can be recycled, and the method has potential industrial application value.

The invention discloses a gate station controller and systematic manager system, which is characterized in that: the measurement, control and management are realized in in-situ monitoring mode of an industrial personal computer and a PLC. The industrial personal computer has the capacities of combinational, modular and standardized data operation, data processing, communication and man-machine interaction. The function of the PLC is realized by developing a software package on a PC. The industrial personal computer replaces the traditional PLC, namely, the PC with PLC function.

The invention discloses a nuclear power plant radioactive fluid waste online sampling device which comprises a sampling part sealedly connected to a fluid pipeline, a movable rod sealedly accommodated in an accommodating space, and a driving device sealedly mounted on the sampling part; the sampling part is provided with the accommodating space and a sample discharge port communicating with the accommodating space; the movable rod is provided with a concave sampling space and can perform reciprocating motion between a sample discharge position and a sampling position; the driving device drives the movable rod to perform reciprocating motion between the sample discharge position and the sampling position in the accommodating space; when the movable rod is located at the sampling position, the movable rod enters the fluid pipeline, and a fluid sample enters the concave sampling space; when the movable rod is located at the sample discharge position, the concave sampling space corresponds to the sample discharge port, and the fluid sample carried in the concave sampling space flows into a shield sampling bottle sealed connected on the sample discharge port from the sample discharge port. In addition, the invention also discloses a nuclear power plant radioactive fluid waste online sampling method.

The invention relates to a layered calorific value correction mode based different-coal quantity control method. The method includes the steps of 1), establishing a layered calorific value correction mode through a coal calorific value of each coal bed; 2), through setting of the layered calorific values, a control system acquiring calorific value data information of the different coal beds, accurately controlling secondary wind under different coals, optimizing combustion favorably and improving safe and economical operation of a machine set; 3), through setting of the layered calorific values, the control system acquiring the calorific data information of the different coal beds to realize that different coal quantity changes among the different coal beds in varying load, adding more coals to coal mill groups with combustion of high-calorific value coals when adding the load, and reducing the coals from the coal mill groups with combustion of the high-calorific value coals to reduce fluctuation of low-calorific value coals when reducing the load. Compared with the prior art, the different-coal quantity control method has the advantage of stability in boiler combustion.

The invention relates to an intermittent energy mass data processing method. The method includes the following steps that (1) an intermittent energy mass data processing platform is established, wherein the processing platform comprises a main cloud central server, an auxiliary cloud central server, a first load server, a second load server, a third load server, a fourth load server, a fifth load server, a sixth load server, a seventh load server, an eighth load server, a ninth load server, a tenth load server, an eleventh load server, a terminal data bus, a load bus and a data interface bus; (2) data are acquired, wherein original data stored in a terminal data computer are acquired by the main cloud central server and the auxiliary cloud central server through data acquisition interfaces C of the servers; (3) data are stored, wherein the acquired mass data are stored in an HDFS; (4) the data are processed, wherein concurrent processing is conducted on the data through a MapReduce model, the main cloud central server only uniformly dispatches storage and processing of the data, and the specific data storage and processing steps are conducted through the first load server, the second load server, the third load server, the fourth load server, the fifth load server, the sixth load server, the seventh load server, the eighth load server, the ninth load server, the tenth load server and the eleventh load server. The method has the advantages that the processing speed is high and safety and reliability are achieved.

The invention discloses a distribution network power supply capability analysis system, method, and a computer readable storage medium. A power-side photovoltaic and wind power output uncertainty characterization model is established; load-side fixed loads, distributed energy storage loads and electric vehicle loads are classified according to classes at the same time to establish uncertainty characterization model; a distribution network power supply capability evaluation model is then established; in combination of distributed power access and the impacts of different loads on the distribution network power supply capability, the more accurate maximum power supply capability of the distribution network is obtained; and the random characteristics after the distributed photovoltaic wind power is accessed to the distribution network are comprehensively considered, an accurate and effective distribution network power supply capacity evaluation system is established, the subsequent powersupply quality and the power supply reliability are effectively ensured, and the safety and the economics of network operation are enhanced.

The invention discloses a design method for reducing the misoperation rate of a reactor protection system. The method comprises the following steps: an acquisition and operation unit in a third protection channel firstly screens received signals, and then the screened signals are quantitatively compared; acquisition and operation units in a first protection channel and a second protection channelrespectively quantitatively compare the received signals; and the signals quantitatively compared by the three acquisition and operation units undergo two-out-of-three logic operation processing, andthe generated final protection action signal is input into the reactor protection system. The method avoids the maloperations of the protection system, caused by failure or maintenance of a DCS modulein one channel of a one-out-of-two voting logic function in the running period of a nuclear power plant, reduces the spurious shutdown / wrong special driving risks of the nuclear power plant, and is beneficial for improving the economical and safe property of the nuclear power plant.

The invention discloses a method for predicting the corona inception field intensity of an EHV / UHV divided conductor by considering altitude correction, which comprises the steps of building a prediction model, measuring parameter values and calculating the predicted field intensity. The preferable field intensity prediction model is defined in the description. According to the invention, an actual corona inception field intensity value of the divided conductor at the altitude point can be obtained under the premise of substituting the known altitude, the sub-conductor radius and the number ofdivisions into a corona inception field intensity calculation formula, and the calculation result is obviously better than that of a Peek formula. The corona inception field intensity values of divided conductors of EHV / UHV alternating current transmission lines at different altitudes can be accurately calculated, thereby providing a reference for the design of conductor selection of EHV / UHV overhead lines in a high-altitude area, and achieving a purpose of improving the operation safety and economy of the transmission lines.

The invention belongs to the field of petroleum engineering and relates to the technology of natural gas storage and transport, in particular to a whole-course swing spiral flow conveying pipeline and natural gas hydrate decomposing process device. A natural gas hydrate pipeline conveying device is composed of flow guide strips at two ends, the two flow guide strips are symmetrically arranged in a pipe wall, are fixed around the inner wall of a pipeline in the same direction in the whole course and form a spiral shape, and a spiral pipeline is formed. By means of the pipeline spiral gas hydrate conveying method, addition of inhibitors, polymerization inhibitors and other chemicals is omitted, and conveying safety and economical efficiency of natural gas are improved. By the adoption of a three-stage hydrate decomposing tower, carbon dioxide and hydrogen sulfide are effectively separated out, traditional natural gas desulfuration and decarbonization equipment is omitted, and water in the whole process is recycled through a water storage tank. Besides, a solar heat collector is used for heating the water, energy consumption is low, and the requirements for economic efficiency, environment protection, high efficiency, recyclability and the like are met.

The invention discloses a safe and energy-saving pricking-prevention low-hysteresis tire. The tire is mainly composed of an inner ring, a bent beam support object and an outer rubber tire, wherein the inner ring is positioned at the innermost side, is round, and plays the role of connecting a rim and the bent beam support object; the bent beam support object is formed by the rotational and symmetrical arrangement of a plurality of bent beam components which are same in shape and are made of low-elastic-hysteresis materials between the inner ring and the outer rubber tire by taking a wheel shaft as the center, can play the role of supporting as well as can replace the rubber side wall of an inflated tire to transmit power, and also reduces the energy and power loss due to elastic hysteresis as far as possible; while the outer rubber tire is braced to the outer side of the bent beam support object, and can play roles of buffering, damping and reducing the abrasion of the bent beam, and can wrap the integral or partial of the tire in necessity so as to insulate dustiness. The safe and energy-saving pricking-prevention low-hysteresis tire can be used for solving the problems that the traditional inflation type tire is easy to prick and explode, is high in elastic hysteresis and the like, and the vehicle driving safety and energy conservation are improved effectively.

The invention discloses a wheel hub motor distributed time-sharing four-wheel drive electric vehicle chassis configuration, a four-wheel drive electric vehicle and a control method. The wheel hub motor distributed time-sharing four-wheel drive electric vehicle chassis configuration comprises a frame assembly, wherein the frame assembly is provided with a first tire rim assembly, a second tire rimassembly, a centralized motor, a power battery pack, a vehicle controller, a high voltage power distribution box, hub motors and a radiator assembly. The first tire rim assembly is in transmission connection to the centralized motor through a drive shaft and a transmission, and the hub motors are mounted on the second tire rim assembly. A charging machine is electrically connected with the high-voltage power distribution box, and the high-voltage power distribution box is electrically connected with input ends of the vehicle controller and the power battery pack. The vehicle controller is electrically connected with the hub motors, and an output end of the power battery pack is separately connected to the centralized motor and the hub motors through an inverter. The inverter is electrically connected to the high voltage power distribution box. According to the invention, power demands by different driving conditions can be met, and the transmission efficiency is high.

The invention relates to a dynamic feedback analysis and optimization design method for a fissure rock slope based on monitoring information. According to the dynamic feedback analysis and optimization design method for the fissure rock slope based on the monitoring information, quantitative analysis, optimization design and risk prediction of the engineering stability of the fissure rock slope are achieved, and engineering safety and economical efficiency are improved. According to the technical scheme, the dynamic feedback analysis and optimization design method for the fissure rock slope based on the monitoring information is characterized by comprising the steps that the slope is divided into a plurality of excavation construction steps conducted along the slope from top to bottom, andeach construction step comprises slope excavation construction and supporting structure construction; deformation of each construction step during slope excavation is monitored in real time; and aiming at the n construction step, wherein n is greater than or equal to 1, a fissure rock numerical analysis model is established based on the survey result of the site rock mass structure characteristics. The dynamic feedback analysis and optimization design method is suitable for fissure rock slope treatment in the fields of water conservancy and hydropower, traffic and the like.

The invention discloses a zirconium alloy pellet-cladding tube and a preparation method thereof. The zirconium alloy pellet-cladding tube comprises a zirconium alloy tube and a composite protection layer, wherein the composite protection layer is formed on at least a part of the surface of the inner wall of the zirconium alloy tube; and the composite protection layer comprises a graphene materialand a zirconium material. Due to adoption of the composite protection layer of the graphene material and the zirconium material on the inner wall of the zirconium alloy pellet-cladding tube, the anti-PCI (pellet cladding interaction) of a pellet cladding shell and a core block can be effectively improved, iodine-induced stress corrosion cracking can be alleviated, and meanwhile, the wearing resistance of the pellet cladding shell can be improved.

The invention discloses a method and a system for activating potential flexibility of a power system, and belongs to the field of electrical engineering. The method comprises the steps of establishing a continuous time scheduling model of a power system; fitting a power curve of the power system load and the new energy output by adopting Bernstein polynomial interpolation to obtain a Bezier power curve; transforming the continuous time scheduling model from a function space to a Bernstein polynomial interpolation coefficient space based on an enhancement matrix constructed by a Derkstrom algorithm to obtain an interpolation coefficient space optimization model; solving the interpolation coefficient space optimization model in the Bernstein polynomial interpolation coefficient space; and restoring an interpolation coefficient space optimization result to a function space to obtain an optimal continuous time scheduling plan. According to the method, an enhanced solution space transformation method is established, feasible region reduction in the power system continuous time scheduling problem solving process is reduced, and a basis is provided for activating potential flexibility.

The invention relates to an overall process quantitative evaluating method for hydraulic energy utilization evaluation of a water-turbine generator set. A hydraulic energy utilization evaluating method for the water-turbine generator set needs to be researched currently. The method comprises the following steps: firstly, reading measured data of a hydropower station computer supervisory control system, a reservoir operation automatic system, and a generator set ultrasonic flowmeter, to obtain a running state and real-time running data of the water-turbine generator set; secondly, based on therunning state of the generator set, performing the conversion process decomposition of the generator set from a generator set passing hydraulic energy to an electric energy, and determining the conversion composition of the generator set passing hydraulic energy; thirdly, establishing a calculating model of each part of the energies of the generator set passing hydraulic energy conversion, and calculating the energy in real time; and fourthly, based on a real-time calculating result, counting and calculating each part of the energies of the generator set passing hydraulic energy conversion ina specific time interval, and performing the quantitative evaluation on the generator set hydraulic energy utilization conversion. The method is capable of realizing the instant evaluation and the ex-post evaluation of the generator set energy efficiency performance, and guiding the safe and economic operation of a power station.

The invention discloses an SCR denitration device for controlling the escape rate of ammonia. The device comprises a denitration system, one side of the denitration system is fixedly connected with afirst pipeline, a second pipeline and a third pipeline, one ends of the first pipeline, the second pipeline and the third pipeline extend into the denitration system, and the one ends of the first pipeline, the second pipeline and the third pipeline are sequentially arranged in the denitration system from top to bottom; and outside the denitration system, the other ends of the first pipeline, thesecond pipeline and the third pipeline are fixedly connected with a flue gas analyzer. The SCR denitration device for controlling the escape rate of ammonia extracts flue gas in the denitration systemfrom different pipelines to make the flue gas analyzer realize the purpose of multipoint measurement, and utilizes a controller to control a plurality of solenoid valves in order to accurately adjustthe ammonia spraying amount and treat SO3 in the flue gas, so the problems of large size of the cross section of a flue and inaccurate result of single-point test are solved, and escape caused by excess ammonia spray amount is avoided.

The invention discloses a safety accident protection method based on a nuclear power plant protection system. The reactor protection system generates two paths of automatic safety injection instruction signals at the same time, wherein the first path of automatic safety injection instruction signal is sent to an RS trigger of safety level software, and meanwhile the second path of automatic safetyinjection instruction signal is transmitted to an RS trigger of an ECP relay circuit; after the first path of automatic safety injection instruction signal is sent to an RS trigger of safety level software, the RS trigger of the safety level software is triggered to automatically carry out safety injection, preset delay is triggered to allow reset timing; and after the preset delay is finished, an operator is allowed to stop safety injection; and the second path of automatic safety injection instruction signal is transmitted to an RS trigger of the ECP relay circuit and then is subjected to logic OR processing with a manual safety injection instruction based on a relay, then safety injection is carried out after the RS trigger of the ECP relay circuit is triggered, and preset time delay is triggered to allow reset timing; finally, an operator is allowed to stop safety injection after the preset time delay is ended. The safety and economy of the nuclear power plant are improved.