36results about How to "High saturated vapor pressure" patented technology

The present invention relates to a kind of starter of liquid rocket engine and design method thereof, is provided with propellant storage tank, add discharge valve, solenoid valve, gas generator and igniter; Store nontoxic self-pressurized propellant in the propellant storage tank, because The saturated vapor pressure of the medium is relatively high, and the driving pressure of the propellant can be provided by using the pressure of the medium itself; there is a filling and discharging valve connected to the connecting pipeline between the storage tank and the solenoid valve to fill and discharge the non-toxic self-pressurized medium. After the solenoid valve Connect the inlet of the gas generator through the pipeline, ignite the propellant to generate gas, and the gas enters the downstream turbine casing at high speed, and drives the turbine to rotate to realize the start of the engine. The invention adopts the nitrous oxide-based composite propellant, which has the advantages of green and non-toxic, high saturated vapor pressure, high specific impulse, low use cost and easy maintenance. The starter is simple in structure, light in weight, non-toxic and pollution-free, can be started many times, and can be used repeatedly.

The invention discloses a method for realizing on-site rapid high-sensitivity detection of drugs by combining pulse purging and halogen lamp flash thermal desorption. Devices in the method mainly comprise a photo-thermal halogen lamp, a high-temperature-resistant quartz optical lens, a high-voltage pulse valve, a heatable thermal desorption micro-area and the like. The main principle of the methodis that the halogen lamp is used for rapidly heating the heatable thermal desorption micro-area to heat the drugs, and the drugs can be heated to 250 DEG C or above at a focus within 2 seconds, so that the saturated vapor pressure of the drugs is greatly improved, and meanwhile, the diffusion of the samples in space is effectively reduced by virtue of the constructed narrow thermal desorption micro-area; and the instantaneous high-speed purging of a pulse valve is combined to more effectively transmit the sample steam from the heatable thermal desorption micro-area to the ionization area, sothat the utilization rate of the samples is improved. The flash thermal desorption temperature rise speed of the halogen lamp is high, sample residues are small, and compared with a traditional constant-temperature metal contact type heating mode, the method is reduced in power consumption greatly; and the combination of the two fully meets the requirements of on-site portable analytical instruments.

The invention provides a graphite powder purification method. The method comprises the following steps: graphite powder to be purified is placed into a high-temperature sealed kiln and undergoes vacuum calcination in the atmosphere of protective gas; when the calcination temperature reaches 2,000-3,000 DEG C, multiple pneumatic control variation steps are carried out to control periodic pulsative oscillation change of air pressure in the high-temperature sealed kiln. Each pneumatic control variation step contains a gas withdrawal step and a gas injection step. For 1-3 h of each pneumatic control variation step, range of pressure change in the high-temperature sealed kiln is controlled to 1-10 kPa. According to the invention, the graphite powder with high carbon content can be obtained under the condition of low calcination temperature. The preparation process is simple, and the requirement on equipment is low.

The invention discloses a gas phase corrosion inhibitor and a preparation method thereof. The vapor phase corrosion inhibitor comprises 8% to 15% of alkyne amine and 8% to 15% of organic solvent according to mass percentage, and the balance is water. Its preparation method comprises the following steps: first, uniformly mix the alkyne amine and water in the formula ratio to obtain an aqueous solution of the alkyne amine; then, add an organic solvent in the formula ratio to the aqueous solution of the alkyne amine and mix evenly to obtain the gas phase corrosion inhibitor agent. The gas-phase corrosion inhibitor has a high saturated vapor pressure, has a significant corrosion inhibition effect on atmospheric corrosion of carbon steel, and has a long-lasting protective effect. At the same time, compared with gas-phase corrosion inhibitors such as dicyclohexylamine nitrite and cyclohexylamine carbonate, the gas-phase corrosion inhibitor provided by the invention has less toxic and side effects and more significant corrosion inhibition effect. The gas-phase corrosion inhibitor provided by the invention has easy-to-obtain raw materials, simple preparation process, and less toxic and side effects, can effectively reduce the corrosion rate of atmospheric corrosion of carbon steel, and prolong the service life of various iron and steel instruments and equipment.

The invention discloses a germanium sulfide polycrystalline film and a preparation method thereof, and a solar cell containing the germanium sulfide polycrystalline film. The thickness of the germanium sulfide polycrystalline film is 400-800nm, which is obtained by adding seed layer pre-deposition and post-step in-situ annealing (three-step method) on the basis of the traditional near-space rapid sublimation method. The process is simple to operate. And coherence can be realized by adjusting the switching sequence of nitrogen gas and air pump, and a substrate suitable for depositing germanium sulfide is obtained by two-step magnetron sputtering method and high temperature selenization. The p-type layer material germanium sulfide (GeS) in the solar cell is an inexpensive and environmentally friendly semiconductor optoelectronic material with a band gap of about 1.73 eV, covering most of the visible light spectrum, and an absorption coefficient as high as 10 5 cm ‑1 Therefore, the thin-film solar cell composed of it as the absorber layer will have great application prospects.

The invention relates to a fast-demoulding casting type PU elastomer compound; two component systems are adopted; one is a prepolymer component; vulcabond is reacted with polylol for obtaining a prepolymer with NCO percent is equal to 9 to 15 percent (weight); polypropylene oxide ether polylol with molecular weight of 1000 to 3000 and a functionality of 2 to 3 is adopted as the polylol; the second is a polymer component which consists of the polypropylene oxide ether polylol with a molecular weight of 1000 to 3000 and a functionality of 2 to 3, an aromatic diamine firming agent and a catalyst. The prepolymer component and the polymer component are mixed according to a weight ratio of 1: 1, cast, vulcanized and shaped; a product can be demoulded in ten minutes without post-vulcanization, thus obtaining the fast-demoulding casting type PU elastomer with a product rigidity of shoreA80 to 97 and excellent mechanical properties. The fast-demoulding casting type PU elastomer compound is mainly used for manufacturing the products of PU elastomer such as polyurethane rubber wheel, polyurethane plank stuff and rubber roller, etc.

The invention relates to a method for achieving substance purification through suspension smelting. The method comprises the steps that S100, a vacuum suspension smelting device is provided; S200, to-be-purified substance raw materials and metal are put into the vacuum suspension smelting device, impurities exist in the to-be-purified substance raw materials, the relation curve of the impurities is close to that of the saturated vapor pressure and temperature of to-be-purified substances, and the melting point of the metal is higher than that of the to-be-purified substances; and S300, the vacuum suspension smelting device is used for heating, the to-be-purified substances evaporate, and therefore the to-be-purified substances are separated from the impurities and the metal.

The invention discloses a heat exchanging method of liquid natural gas (LNG) cold energy used for a high-temperature-level cold energy user. According to the method, in the process of LNG entering tube passes of the upper portions of heat exchangers from an LNG storage tank, heat exchanging is achieved among the LNG, first refrigerant and nitrogen added into shell passes of the upper portions of the heat exchangers, and the temperature rises; the LNG passes through an air vaporizer and enters a natural gas pipeline network after the temperature rises; on the upper portions of the heat exchangers, the temperature of the first refrigerant and the nitrogen coming out of a refrigerant storage tank decreases to -40 DEG C-0 DEG C after heat exchanging is performed among the first refrigerant, the nitrogen and the LNG, and the first refrigerant and the nitrogen come into a liquid phase from a gas phase and enter the lower portions of the heat exchangers; the pressure PB of the nitrogen is determined through the formula (6) shown in the specification; the cooled first refrigerant achieves heat exchanging with second refrigerant on the lower portions of the heat exchangers, the temperature of the first refrigerant rises, the first refrigerant comes into a gas phase from the liquid phase and returns to the upper portions of the heat exchangers, and therefore a cycle is completed. Through using the usage amount of the nitrogen for changing the partial pressure of the refrigerant, the sensitivity of system operation is improved while the freezing point of the first refrigerant is lowered, and safety and stability in the heat exchanging process are guaranteed.

The invention discloses an oil gas automatic recovery system capable of remote monitoring, comprising: a main recovery device, which includes a main recovery pipeline, a first recovery group and a second recovery group arranged in parallel with the first recovery group, the first pipeline and the oil gas The intake pipe is connected, and the second pipe is connected with the exhaust gas discharge pipe, so that the first recovery group and the second recovery group alternately carry out the adsorption and desorption of oil and gas; the first recovery group and the second recovery group are equipped with the first adsorption bed and the second adsorption bed, the first adsorption bed and the second adsorption bed are respectively built-in polyvinyl fluoride nanomaterials for adsorption and desorption of oil and gas; oil and gas absorption tank; buried oil tank; monitoring device, which includes a controller and The monitoring device is connected with the controller to monitor the gas concentration at the outlet of the waste gas discharge pipe in real time. The invention can monitor the discharge index in real time, ensures the operation of the system when the discharge reaches the standard, adopts the adsorption bed to rotate adsorption and desorption, improves the operation efficiency of the recovery system, and occupies a small area.