65results about How to "Safe and stable long-term operation" patented technology

The invention discloses a control method of a micro-grid bidirectional DC/DC (Direct Current/Direct Current) change drooping coefficient. The method comprises the following steps: detecting direct current bus voltage Udc and direct current bus current Idc on an output side; inputting the Udc, the Idc, a direct current bus voltage set value Udc<*> and a drooping coefficient initial value k0 into a direct current bus drooping controller; comparing the direct current bus voltage Udc with the direct current bus voltage set value Udc<*> to determine a DC/DC working region and regulating the drooping coefficient of each region; calculating a DC/DC output voltage reference value Udc-ref; transmitting a difference value of the DC/DC output voltage reference value Udc-ref and the direct current bus voltage Udc into a direct current voltage PI (Proportional Integral) regulator, and outputting a given value Idc<*> of a current ring; comparing the Idc<*> with the direct current bus current Idc, inputting the difference value into the direct current PI regulator, and taking the output as a given value of PWM (Pulse Width Modulation); generating PWM wave for controlling switch-on and switch-off of an IGBT (Insulated Gate Bipolar Transistor) to realize constant voltage control of DC/DC. The problem that the DC/DC output power cannot be regulated on line in the drooping control is effectively solved, the dynamic performance and the steady state performance of a direct current converging system are improved, and loop current between energy storage units is reduced.

The invention discloses a power supply cable type selecting method for an urban track traffic traction power supply and distribution system, and belongs to the field of urban track traffic traction power supply and distribution design. By aiming at the problem of serial and parallel connection resonance caused since the cable charging capacitance is not sufficiently considered in the existing power supply cable design, the invention provides the power supply cable type selecting method by using the public electric network background harmonic voltage and traction rectification machine unit harmonic current frequency distribution as well as the harmonic current amplification factor and the harmonic voltage amplification factor as the basis. The power supply cable type selecting method has the technical scheme that a traction power supply and distribution system equivalent harmonic calculation model and a simplified model of the traction power supply and distribution system equivalent harmonic calculation model are built, and a curve chart, using the harmonic times, the power supply cable length and the power supply cable unit length charging capacitance as the variables, of the harmonic voltage amplification factor and the harmonic current amplification factor is drawn. The power supply cable type selecting method has the advantages that the harmonic serial and parallel connection resonance of the cable charging capacitance is fundamentally avoided, and the guidance significance is realized on the power supply cable design and type selection of other power supply and distribution systems.

The present invention discloses a heat energy utilization method and a heat energy utilization system during polycrystalline silicon production. According to the method, high temperature backwater from a reduction furnace system in polycrystalline silicon production is conveyed into a flash evaporation system and is subjected to flash evaporation in the flash evaporation system, wherein the temperature of the high temperature backwater entering the flash evaporation system is 145-160 DEG C, and the pressure is 0.5-0.6 MPa; the low pressure steam with the pressure of 0.175-0.25 MPa is flash-evaporated from the flash evaporation system, and the remaining high temperature water with the temperature of 128-133 DEG C after the flash evaporation is pressurized, then returns to the reduction furnace, and forms the high temperature feeding water of the reduction furnace system; and the flash-evaporated low pressure steam is conveyed to other equipment requiring the steam in the polycrystalline silicon production, and the condensate obtained through heat exchange with other equipment returns to the flash evaporation system. With the method of the present invention, a lot of the heat energy produced in the polycrystalline silicon production can be completely utilized so as to improve the heat energy recovery and utilization rate.

The invention belongs to the field of pressurized water reactor nuclear power plants and particularly discloses a pressurized water reactor nuclear power plant control rod position detector coil overall winding method, which comprises the following steps: (1) using an NC winding machine wind out the primary windings at one time; (2) setting the start-up circle number and winding speed of the NC winding machine, and winding out each phase secondary winding at one time in accordance with the A-B-F-E-C-D or A-B-E-F-C-D phase order; (3) adopting the entire dual-vacuum impregnating process to impregnate the entire rod position detector coil winding; (4), welding the coil winding with the coil lengthening leading wire through resistance melting welding; (5),and carrying out dual-vacuum impregnating on the connecting points between the coil winding and the coil lengthening leading wire after an organosilicon casing is sleeved. The method solves the problems of insulation reduction and coil breaking of the rod position detector in the high-temperature and high-radiation environment and enables the service life of the detector to reach 40 years.

The invention discloses a uniform ammonia spraying system and a method for controlling the same. The uniform ammonia spraying system comprises a flue. The flue is connected with a furnace outlet of a boiler, a first flue gas sampling opening is formed in a location, which is positioned between the furnace outlet and a coal economizer section, of the flue and is used for measuring the initial content of NOX at the furnace outlet, a plurality of flue gas flow velocity sensors are distributed at different locations of a vertical section of the flue and are positioned between the coal economizer section and a denitration catalyst section, a plurality of ammonia gas spray nozzles are distributed on the same vertical section and are connected with a multi-channel ammonia gas delivery control circuit, and a second flue gas sampling opening is formed in a location, and which is positioned between the denitration catalyst section and an air preheating section, of the flue and is used for detecting treated flue gas to determine whether the content of NOX in the treated flue gas is lower than a standard value or not. The uniform ammonia spraying system and the method have the advantages that the blindness of local ammonia spraying in the flue can be reduced, ammonia escape can be decreased, air preheater blocking phenomena can be reduced, accordingly, long-term stable and safe running of units can be guaranteed, and the uniform ammonia spraying system and the method are beneficial to actual running of power plants on the aspects of safety and economical efficiency.

The invention discloses a basement reinforcement system of a heavy-duty railway tunnel in a water-rich soft stratum and a construction method thereof, and belongs to the technical field of tunnel traffic engineering. According to the basement reinforcement system, a pile beam slab structure improves the overall rigidity of a track bed, bears the track bed and the load of trains, transmits the track bed and the load of the trains to a bottom bedrock, the track bed and the load of the trains act on the slab structure, and the track bed and the load of the trains are transmitted to the bedrock sequentially downwards through a longitudinal beam, a cross beam and a pile foundation, so that a reinforcement part and an original basement structure form a whole to work together and to be reinforced, and an inverted arch structure bears the surrounding rock pressure together with a tunnel arch wall to form a stable whole. According to the basement reinforcement system, a drainage pipeline is arranged on the inverted arch structure so as to remove accumulated water between an initial support and soil timely in the water-rich soft stratum geology, and the problem of mud pumping can be avoided.A construction method of the basement reinforcement system is low in cost and simple in process, the quality is easy to control, construction goals of maintenance-free and maintenance-less are realized, and economic and social benefits are remarkable.

The invention discloses a self-adaptive temperature optimization control method under all working conditions of a cement calcination decomposing furnace. The method comprises steps as follows: a GPC (generalized predictive controller) is established on the basis of a predictive control algorithm of an input/output parameterized model, wherein input variables comprise the kiln tail coal feeding quantity, the kiln feeding quantity, the tertiary air temperature and the smoke chamber temperature, and the output variable comprises the decomposing furnace outlet temperature; control model parameters are set, and the GPC is initialized; input/output variable signals are acquired in real time and fed back to the GPC; the GPC performs self-correction on the control model parameters according to the actual value and the predicted value of the output variable, works out input variable controlled quantities and outputs control commands to an executing device; the executing device controls the kiln tail coal feeding quantity and performs self-adaptive adjustment on the supply quantity of the kiln feeding quantity according to the decomposing furnace outlet temperature; recycle and feedback control is performed until the technological process is ended. The mathematical model better conforming to actual production working conditions is established for control, and the control effect is more accurate.

The invention relates to a phase correction method for arbitrary impulse converter transformer current difference. When a converter transformer is at a no-load status, a phase difference theta exists in positive sequence current of a line side winding and a valve side winding, and the theta is any angle. The phase correction method comprises the following steps: selecting a side winding of the converter transformer as a reference winding, and performing phase correction to the other side winding current towards the reference winding current; using a phase relationship of three-phase current sequence components on the two sides of the converter transformer, and a conversion method of the sequence components and the phase components to calculate differential current. Due to the adoption of the phase correction method, the differential current of any impulse converter transformer can be calculated, so that a high-voltage direct-current power transmission system safely and stably operates for a long time; the method has the advantages of easily applying and preventing the generation of false differential current. Moreover, according to the phase correction method, a problem that the phase correction is only achieved when the same-phase current phase difference on the two sides of the converter transformer is 30 N (N is an integral number) as the current phase correction method adopts the adding and subtracting of the three-phase current vectors on certain side can be solved.

The invention provides a thermal resonance fusion engine, and belongs to the technical field of engines. The thermal resonance fusion engine comprises an internal expansion part, a Sterling engine, a steam piston, a steam turbine and a gas turbine; turbine air jetting, punching air jetting and a rocket type are achieved; gas and liquid working media, and an closed or opened cycle are adopted based on a thermal resonance fusion stack; a standardized, modularized and serial design is adopted; fossil fuel is not used and oxygen is not needed in an operation process; an operation mode that only fusion fuel is input and mechanical power and a pollution-free fusion product are output is realized, and long-period, safe, stable and economic operation is realized. A principle technology, industrial manufacturing and large-scale industrialization are all feasible. The structure is simple. No radiation is formed outside a shielding layer. A plurality of thermoelectricity and power sources can be provided at the same time. The thermal resonance fusion engine can be enlarged or miniaturized. The thermal resonance fusion engine can be used as a mini-size, small-size, middle-size or large-size engine for being widely applied to vehicles, ships and various machines. The thermal resonance fusion engine can be operated for ultra-long time. The thermal resonance fusion engine can provide green, safe, cheap and sufficient mechanical power to development of economic society and civilization, and is especially suitable for long-distance and long-time comprehensive application.

The invention discloses an improved limestone/lime-gypsum wet flue gas desulphurization technology. Limestone or a soda lime slurry is adopted as an absorption slurry, and sulfur dioxide flue gas absorption and oxidation reaction are carried out in an oxidation desulphurization device to obtain a gypsum product. The technology is mainly characterized in that the slurry supply position is changed; the oxidation tube layout is improved, and the oxidation gas quantity is greatly improved; the running height of a slurry pool is improved, and the density of the slurry is adjusted; and the pH value running parameter of an absorption tower is adjusted. The improved technology effectively prevents slurry poisoning, realizes preparation of highly pure gypsum through continuous and efficient oxidation of the limestone/lime-gypsum slurry, avoids absorption tower slurry poisoning, and greatly improves the quality of gypsum completely reaching commercial standards.

The invention provides a three-phase unbalanced load switching method based on the networking of a phase-change switch. A phase-change switch system in a low-voltage power distribution area comprisesa main control box for conducting the three-phase voltage and current measurement and calculating the unbalance degree. Multiple phase-change boxes carry out uninterrupted power switching on a load phase sequence. The input ends of the phase-change boxes are connected with A, B and C three-phase power grids. The output ends of the phase-change boxes are connected with single-phase loads. When a plurality of phase-change boxes operate in a networking manner, each phase-change box acquires a current value of a load connected with each phase-change box and transmits the current value to the maincontrol switch box through 433MHz wireless communication. After that, the main control switch box calculates the three-phase unbalance degree, decides which switch box needs to be switched to which phase, and selects an optimal switch combination. According to the method, the accuracy of three-phase imbalance degree calculation is improved. The method is used for reducing the loss of a switching device, ensuring the long-term operation of the phase-change box to be safe and stable, and improving the safety of the phase-change switch system and the power supply reliability.

The invention discloses a sludge super-critical water oxidation system with heat-conducting oil used as a heat exchanging medium and a sludge treatment method. Sludge is introduced into a sludge pyrohydrolysis pot, and then is transferred to a heat exchanger through a material pump for heating, the sludge and oxygen are mixed, in a reactor, super-critical water oxidation reaction is carried out, and a lot of heat is released. Reacted high-temperature fluid passes the heat exchanger at first, and then passes a heat-conducting oil heat exchanger to pass the heat to heat-conducting oil. The heat-conducting oil enters an outer wall coil of the sludge pyrohydrolysis pot to heat the sludge pyrohydrolysis pot, so that pyrohydrolysis reaction is ensured. Through the heat-conducting oil heat exchanger, the heat, which is released by the super-critical water oxidation reaction, of a high-pressure highly-corrosive heat source is converted into a constant-pressure non-corrosive heat source by means of the heat-conducting oil used as the heat exchanging medium, the system safety, economical efficiency and reliability are improved comprehensively, the super-critical water oxidation reaction is completed, and up-to-standard discharge is achieved.

The invention provides the designed head H3/4 and the rated speed n parameter at the designed head H1/2, 3/4Qmax at the designed maximum flow rate Qmax and 1/2Qmax at the design head H1/2, 1/4Qmax, and the geometric parameters of the impeller are adjusted. , impeller outlet diameter D2, impeller inlet diameter Ds, impeller outlet width b2, first group vane inlet side L1, second group vane inlet side L3, first group vane outlet side L2, first set of vane inlet mounting angle beta11, A set of blade exit angles beta 21, a first set of blade wrap angle Phi 1, a second set of blade inlet angles beta12, a second set of blade exit angles beta22, a second set of blade wrap angle Phi 2, and a circumferential relative between the two sets of blades Angle theta. The invention can adapt the submersible electric pump to the variable oil well productivity and ensure the long-term safe and stable operation of the submersible electric pump.

The invention discloses a heating device for a denitration dilution air system. The heating device is installed in an outlet flue of a coal economizer or an inlet flue of a low-temperature superheater, the heating device comprises a plurality of branch pipes, the outlet ends of the branch pipes are arranged in the outlet flue of the coal economizer or the inlet flue of the low-temperature superheater, and the heating device comprises heating branch pipes. The heating device used for heating dilution air is arranged in the outlet flue of the coal economizer or the inlet flue of the low-temperature superheater, and heat of high-temperature flue gas serves as a heating source, so long-term safe and stable operation can be facilitated, the problems of dust accumulation, blockage and the like do not exist, and the heating problem of denitration dilution air can be effectively solved.

The invention provides a phase transfer agent for removing heavy metals from coal tar at a medium and low temperature, and an application thereof. The phase transfer agent comprises 20-50wt% of an organic acid, 30-55wt% of a chelating agent, 10-30wt% of a surfactant, 1-4wt% of a corrosion inhibitor, and the balance of water. The phase transfer agent can effectively transfer oil-soluble Fe and Ca elements in medium and low temperature coal tar heavy oil to water-soluble Fe and Ca and pertinently transfer ferroporphyrin to water-soluble iron in order to well remove Fe and Ca metal elements in the coal tar. The phase transfer agent is in favor of realizing safe, stable and long-term running of an electric desalination device when the phase transfer agent is used in removal of heavy metals from the medium and low temperature coal tar, the total iron removal rate and the total calcium removal rate respectively reaches 95% or above, the ferroporphyrin removal rate reaches 95% or above, and damages to catalytic hydrogenation and other subsequent treatment processes are effectively avoided.

The invention discloses a comprehensive energy station energy efficiency acquisition metering system, and relates to the technical field of energy station monitoring. The system comprises a central processing system; the central processing system is in bidirectional connection with a sending state detection module; an input end of the sending state detection module is connected with an output endof a front server; an input end of the front server is respectively connected with an output end of a first acquisition unit, an output end of a second data acquisition unit and an output end of a third data acquisition unit; an input end of the first data acquisition unit is connected with an output end of a first detection system; and an input end of the second data acquisition unit is connectedwith an output end of a second detection system. According to the comprehensive energy station energy efficiency acquisition metering system provided by the invention, the running condition of a central air conditioning energy station can be provided, on-line acquisition and metering monitoring can be carried out, real-time fault alarming and diagnosis indexes are provided, the long-term safe andstable operation of the system can be effectively guaranteed, and the practicability of the detection systems is greatly improved.

The invention relates to reforming reactor fan-shaped barrels. The reforming reactor fan-shaped barrels are Johnson screen fan-shaped barrels; the cross sections of the reforming reactor fan-shaped barrels shape like fans; when the reforming reactor fan-shaped barrels are used, the back parts of the reforming reactor fan-shaped barrels are firmly pressed against the inner wall of a reactor; the top parts of the reforming reactor fan-shaped barrels are sealed; the bottoms of the reforming reactor fan-shaped barrels are provided with openings and are connected with a collecting tube arranged on the bottom of the reactor; oil gas discharged out of the reforming reactor fan-shaped barrels is mixed in the collecting tube, and is discharged via an oil gas outlet. No connection part of the reforming reactor fan-shaped barrels is observed, almost no leakage point is generated, so that catalyst leakage is avoided; no connection part is observed between a central tube and the reforming reactor fan-shaped barrels, so that deformation and damage of the reforming reactor fan-shaped barrels caused by nonuniform thermal expansion are avoided; the reforming reactor fan-shaped barrels are capable of reducing production cost, and ensuring safe stable long-period operation of equipment.