31results about How to "Promote natural circulation" patented technology

An apparatus for containing and cooling enriched water for the production of activated fluorine (18F). A target assembly includes internal cooling channels in which developed flow of a coolant removes the heat from the target liquid in the target chamber. In one embodiment, the target assembly is fabricated of tantalum.

The present invention provides passive safety equipment, comprising: a cooling part formed to cool a first fluid, which is emitted from a reactor coolant system or a steam generator, and a second fluid in a housing; and a circulation induction sprayer which is formed to spray the first fluid emitted from the reactor coolant system or the steam generator into the cooling part, has at least part thereof open to the inside of the housing such that the second fluid flows thereinto according to a drop in pressure caused by the spraying of the first fluid, and sprays the second fluid with the inflown first fluid.

The light emitting diode mainly consists of light-emitting dies and a metal bed for mounting the die. The metal bed comprises at least one hollow high thermal conductivity metal tube. At least two light emitting diode dies are fixed on one end or center of said metal tube by welding said dies on the wall of said metal tube with gold-tin alloy, or bonding the dies on the wall of said metal tube with high thermal conduction silver paste or organic and inorganic adhesive. The said metal tube has fins or threaded heat-delivery surface. The lamp of light-emitting diode has at least one reflector with a reflecting surface made into parabolic shape mounted on said metal tube.

The invention discloses a method for remedying heavy metal micro-contamination of facility vegetable field soil. Through phytoremediation on heavy metal micro-contamination soil of a facility vegetable field by using ryegrass, the total amount of heavy metals in the soil is reduced; in the normal vegetable growing process, the biological effectiveness of the heavy metals in the soil of the facility vegetable field is reduced by using charcoal; the charcoal is a solid product produced by performing pyrolysis carbonization at 500-700DEG C on bamboo processing residues, straws, rice husks and other agricultural organic wastes under an hypoxic condition, crushing by a crusher and sieving by a 20-mesh sieve. The method is economical, effective, and easy to implement; by the method, secondary pollution is unlikely caused and raw materials are abundant and low in cost; the method is not only applicable to vegetable companies, but also to the farmer homes; according to the actual contamination situation and the phytoremediation effect, the application amount of the charcoal and the organic fertilizer are adjusted, so that the soil heavy metal remedying effect is improved and the cost is reduced; while the remediation of heavy metal contamination is achieved, the soil quality is improved and natural circulation of farmland nutrients is promoted.

The storage of a liquid is usually static in a nuclear power plant; and a storage box only needs to satisfy leak tightness, homoiothermy and accessibility. If stirring and mixing of the stored liquid can be realized in a certain special application occasions, and especially under an accident condition, the preset function of the stored liquid can be strengthened greatly; but the power needed by the stirring and mixing function is usually difficult to obtain in time. The invention belongs to a liquid storage box design, and particularly relates to a liquid storage box for realizing internal fluid driving by utilizing a temperature difference power source. Multiple groups of temperature difference power sources are arranged on a wall body, a top cover and a bottom plate of the storage box; and under the accident condition of the nuclear power plant, the temperature difference power sources enable a reactor to release heat abnormally and change the heat into an electric energy so as to drive a shielding pump and a draught fan both integrated in the storage box to stir and mix the stored liquid.

The invention belongs to the technical field of soil improvement, and discloses a method for repairing heavy metal cadmium and continuous cropping obstacles in protected agricultural soil, including: analyzing the content and composition of heavy metals on soil samples; preparation of the agent; applying the prepared soil repair agent to the soil to be repaired, mixing and leveling the soil by rotary tilling; using pre-treated groundwater for soil irrigation; planting repair plants in the watered soil, and harvesting the plants. The invention uses environmentally friendly materials such as activated carbon combined with restoration plants to carry out soil restoration, which can promote the natural circulation of farmland nutrients, achieve the purpose of controlling soil environmental pollution, realize the source control of agricultural product safety, comprehensively improve the quality and safety level of agricultural products, and reduce the exchangeable rate of cadmium ions. It can stabilize the cadmium ion, change the form of heavy metal cadmium in the soil of facility agriculture, reduce the availability of heavy metal cadmium in the soil, and reduce the absorption of cadmium by crops.

The invention discloses a microbiological method ion exchange soil remediation technology. The microbiological method ion exchange soil remediation technology is characterized in that a soil remediation agent is obtained through the steps such as compounding of microbial flora, compounding of a stable complexing form chemical solution through acid-base neutralization, and preparation of the soil remediation agent. According to the prepared soil remediation agent, acid and alkali ions and microbiological adjustment act on soil jointly, growth of harmful bacteria in the soil can be effectively restrained, meanwhile, microbial bacterial colony in the soil is remediated, thus a good soil ecological environment is formed for the soil so as to facilitate natural circulation of water, fertilizer,air and heat, and the effect that the soil is free of hardening or desertification is ensured. In addition, the heavy metal content in the soil can be lowered, and the soil remediation ability is enhanced.

The invention belongs to the technical field of electromechanical equipment, and particularly discloses a waterproof and dustproof electromechanical equipment protective shell. The shell comprises anouter box body and an inner box body, wherein the outer box body comprises a top cover, side plates and a bottom plate; the side plates include a front side plate, a left side plate, a right side plate and a rear side plate; the left side plate, the right side plate or the rear side plate is provided with a through hole; an air inlet mechanism is arranged at the through hole; the air inlet mechanism comprises a ventilating plate, a dustproof plate and a fan which are sequentially and horizontally arranged from outside to inside; an air inlet is formed in the ventilating plate; the air inlet isinclined upwards; an air outlet is further formed in the outer box body; a water outlet is formed in the bottom plate; and the inner box body is a metal box. The protective shell is divided into theinner box body and the outer box body; the inner box body is the metal box, so that heat dissipation is facilitated; the air inlet mechanism is arranged on the outer box body, and a ventilation gap isformed between the inner box body and the outer box body, so that the flowability of air is conveniently improved, and the heat dissipation effect is improved; the air inlet is inclined upwards, so that rainwater does not easily enter the box; and the dustproof plate is arranged, so that the waterproof and dustproof effects are improved.

The invention provides an intermediate loop flow control method, a control device and a control system for a low-temperature nuclear heating reactor unit. The intermediate loop flow control method includes the following steps: obtaining the operation mode of the low-temperature nuclear heating reactor unit, the set value and measured value of the core outlet temperature, and the set value and measured value of the main steam pressure; and according to the In the above operation mode, based on the set value and measured value of the core outlet temperature and / or the set value and measured value of the main steam pressure, the intermediate loop flow set value is determined, so that according to the intermediate loop flow setting Fixed value to control the speed of the intermediate circuit pump.

The invention relates to a small-sized high-temperature aerobic composting device for high-viscosity materials, comprising a shell and a cover for filling compost materials, the lower part of the shell is fixed with an anode plate serving as a filter plate, and the upper part of the shell is movable A cathode plate is provided, and the anode plate and the cathode plate are respectively connected to the positive pole and the negative pole of the direct current power supply, and a ventilating pipe capable of introducing oxygen is provided between the anode plate and the cathode plate in the housing. The device can achieve the balance of heat preservation and ventilation, and solve the problem of anaerobic and moisture imbalance inside the high-viscosity material, so that the small-scale aerobic composting of high-viscosity material in the laboratory can reach a higher temperature.

The invention discloses a passive natural circulation intensifying system and method for a liquid metal cooled reactor after flow loss, and belongs to a safety protection system of the liquid metal cooled reactor. The passive natural circulation intensifying system comprises a high-pressure gas storage tank, a throttle valve, and a vertical pipeline and an inverted U-shaped pipeline which are positioned in a reactor. According to the system and the method disclosed by the invention, due to the connection design of the pipelines, when a main pump loses drive force, the liquid metal cooled pool type rector automatically triggers high-pressure gas to be injected into the upper part of a reactor core by a high-pressure injection tank without any signal transfer; and the injected gas pushes a coolant at an exit of the reactor core to flow upwards, and the natural circulation after a flow-loss accident is intensified. According to the system and the method disclosed by the invention, the automatic start of the reactor can be realized after the forced circulation is lost, and the natural circular flow of cold and hot pool loops is intensified so as to guarantee the effective cooling of the reactor core.

The invention provides a passive containment auxiliary cooling system and method. The containment includes an inner containment and an outer containment. The cooling system includes: a nozzle, a spray pipeline, a distribution device and a water supply device; the spray One end of the pipeline extends below the top outlet of the outer containment vessel, and the other end is connected to the water supply device; the number of the nozzles is multiple, and they are arranged at intervals on the spray pipeline below the top outlet of the outer containment vessel, and the nozzles Oriented so that the cooling water sprayed by the nozzles falls on the center of the inner containment dome; the distribution device is arranged on the top of the inner containment for evenly distributing the cooling water sprayed by the nozzles to the top of the inner containment surface to form a cooling water film. The method and system of the invention can effectively solve the defect that the containment only depends on passive air cooling, enhance the cooling capacity of the cooling system, and thus improve the safety performance of the nuclear power plant.

The invention relates to a low-flow-resistance heat exchanger for a natural circulation system. The low-flow-resistance heat exchanger comprises an inlet tube box (2), an inlet tube plate (3), a heat transfer tube bundle, an inlet supporting plate, an outlet supporting plate, an outlet tube plate (6) and an outlet tube box (7). The heat transfer tube bundle is divided into an inlet shrinkage region, a heat exchange region and an outlet shrinkage region. The heat exchanger is a shell-free type heat exchanger. Small-diameter tubes are adopted as heat transfer tubes (4) in the heat transfer tube bundle. The inlet shrinkage region and the outlet shrinkage region of the heat transfer tube bundle incline downwards. The heat exchange region of the heat transfer tube bundle is horizontally arranged basically, no local high point or air accumulation is generated in the tube pass, low flow resistance is achieved, and the structure is compact.

The invention discloses a horizontal jacket water tank, which comprises an outer shell (1), a medium circulation port and an inner lining jacket (2) for heat exchange, wherein the outer shell is provided with a medium pouring port (3) and a medium overflow port (4); the inner lining jacket (2) consists of an outer layer cylinder body and an inner layer cylinder body; the space in the inner liningjacket (2) serves as a heat exchange space; one end of the inner lining jacket (2) is fixedly welded with an expansion space (5); and a through hole (6) with a diameter of 6 mm is formed between the expansion space and the heat exchange space. As for the structure adopted by the horizontal jacket water tank, the damage caused by volume expansion of the medium does not directly act on the inner lining jacket to lighten the pressure on the inner lining jacket and eliminate potential safety hazards; and a liquid inlet of the medium enters the middle part of the inner lining jacket through a heat-conducting drainage tube to form a height difference with a liquid outlet so as to contribute to natural circulation and enhance the heat exchange effect of a water tank system.