96results about How to "Extend stable running time" patented technology

The invention discloses an efficient multi-field-coordination fine particulate matter removal device and an efficient multi-field-coordination fine particulate matter removal method. The device comprises an outer field coagulation area, a direct current dust pre-collecting area, a pulse charge coagulation area and a direct current dust collecting area which are connected in sequence, wherein water steam and a chemical agglomeration agent are introduced from a nozzle of the outer field coagulation area respectively; the direct current dust pre-collecting area and the direct current dust collecting area are arranged in a line-plate type symmetric structure, a line electrode applies negative direct current high voltage, and a plate electrode is grounded and adopts layout of a water film electrode; the pulse charge coagulation area is arranged in the line-plate type symmetric structure, the line electrode applies positive pulse high voltage, and the plate electrode is grounded and adopts layout of the water film electrode. The device and the method aim at mineral particulate matters discharged by a fixed source; aerosol particulate matters, particularly fine particulate matters, can be subjected to efficient coagulation removal in a structural form of double coagulation areas and double dust collecting areas by using a multi-field-coordination method combined by a phase-change coagulation growth technology, a chemical agglomeration and flocculation mechanism and an electric coagulation technology, so that the phenomena of back corona, re-entrainment of dust, ash deposition and corrosion of the plate electrode are effectively avoided.

The invention discloses a method for catalytically oxidizing cyclohexane, which is characterized in that cyclohexane, hydrogen peroxide and a catalyst are in contact for reacting, the mol ratio of the cyclohexane to the hydrogen peroxide is 0.5-8, the concentration of the catalyst in a reaction system is 0.005-0.1g/min, the reaction temperature is 40-150 DEG C, the catalyst is a titanium-silicon molecular sieve with an MFI structure, a hysteresis loop exits between an adsorption isotherm and a desorption isotherm of low-temperature nitrogen absorption of the molecular sieve, a crystalline grain is a single hollow crystalline grain or an aggregated crystalline grain formed by the aggregation of a plurality of hollow crystalline grains, the radial length of the cavity part of the hollow crystalline grains is 5-300nm, and the benzene adsorption capacity of the sample of the molecular sieve, measured under the conditions that the absorption time is 1h, the temperature is 25 DEG C and P/P0 is equal to 0.10, is at least 70mg/g. The method has the advantages of high selectivity of a target product and environment protection.

The invention discloses a method for dispatching and managing the short messages in the wireless mobile networks, characterized by that, by designating the important time spot and continuous time period in the time cycle, the short message resending strategy is arranged in the different time spot continuous period, dividing the load of the short message dispatching center into multi levels, and configuring the short message processing strategy under the different loads. By using the invention, the short messages stored temporally in the dispatching center is dispatched and managed in a dynamic way, thus increasing the stable operation time for the system, and greatly improving the service quality and reliability of the network short message dispatching center.

A preparation method of cyclohexanone from catalytic oxidation of cyclohexanol is characterized by contacting reactants containing cyclohexanol and hydrogen peroxide with a catalyst at a temperature of 0-180 DEG C and under the pressure of 0.1-3.0MPa, wherein the molar ratio of cyclohexanol to hydrogen peroxide is 1:(0.1 to 10.0), the catalyst is a titanium silicalite molecular sieve based catalyst, and the mass ratio of cyclohexanol and the catalyst is (1-200):1. The method has no special requirements on equipment and the production process is simple, is easy to control and is beneficial to industrial production and application. The invention has the advantages of high cyclohexanol conversion rate, good selectivity, long time stable operation.

The invention belongs to the field of atmosphere environmental protection, and particularly discloses a desulfurization process and device based on out-of-tower circulation and independent oxidization dual-alkali methods. In the process, an out-of-tower circulation process is adopted, wherein an absorption tower is separated from a circulating pool, circulating fluid is extracted by a circulatingpump from the circulating pool which is arranged outside the tower and sprayed into the tower, and smoke rises from the inside of the tower and comes into contact with the circulating fluid to removesulfur dioxide; and the cleaned circulating fluid is drained to the circulating pool through a drainage port at the bottom of the tower, so that the whole out-of-tower circulation process is completed. The desulfurization process has high desulfurization efficiency, long stable operation time, low operation cost and high purity of product gypsum, can be used for effectively preventing the absorption tower from scaling and being blocked, and is suitable for wide popularization and application.

The invention discloses a resistive heater used for an engine combustion chamber experiment system. The resistive heater is used for simulating the high temperature, high pressure and high Mach number in supersonic speed and hypersonic speed flying states and the oxygen component in gas and performing experiment research, free of pollution to experiment working media, on hypersonic speed combustion chamber performance so that related problems caused by incoming flow pollution can be evaluated. According to the resistive heater, thin-wall tube heating bodies serving as heating elements are made of high-temperature-resistive alloy steel, an inner barrel and the thin-wall tube heating bodies are fixed inside a heater shell, and the thin-wall tube heating bodies, the inner barrel and the heater shell together form a heating gas duct. When voltage of 380 V is loaded on the thin-wall tube heating bodies, the thin-wall tube heating bodies emit heat, cold air which is heated flows inside and outside through thin-wall tubes for forced-convection heat exchanging, and the outlet temperature can reach 1000 K. The experiment can be performed inside supersonic speed and hypersonic speed air tunnels very close to actual flying conditions. The resistive heater is simple in structure, long in stable operation time and low in operation cost and works continuously.

The invention discloses an internal-circulation biological fluidized bed system used for VOCs and malodorous gas treatments. The internal-circulation biological fluidized bed system used for the VOCs and malodorous gas treatments comprises a biological fluidized bed reactor which adopts a structure comprising an inner sleeve and an outer sleeve; the inner sleeve is used for forming an up-flow area of fluidized fillers, and the outer sleeve is used as a down-flow area of fluidized fillers, and the fillers are high-molecular light fillers; the air inlet of the biological fluidized bed reactor is located at the bottom, and is connected with a humidifying unit; the fillers in the reactor are in fluidized state; microorganisms attach on the surfaces of the fillers, so that the VOCs and the malodorous gas are removed by mass transfer and degradation processes when the VOCs and the malodorous gas pass through the reactor; and moisture and nutrients are uniformly transported into the gas by the humidifying unit. The fillers have the characteristics of light weight and easy fluidization property; the internal-circulation sleeve reactor structure is capable of ensuring fluidization of the fillers at a relatively low gas velocity; and the pressure drop of the reactor is relatively low. The internal-circulation biological fluidized bed system used for VOCs and malodorous gas treatment overcomes disadvantages of traditional biological waste-gas purification devices, namely low mass transfer efficiency and uneven microbial distribution, and can be used for purifying the VOCs and the malodorous gas in the fields of industry, municipal administration, agriculture and the like.

The invention relates to a fluid dynamic pressure type mechanical seal used for a nuclear main pump and a mechanical seal system, comprising the mechanical seal, of the nuclear main pump. The fluid dynamic pressure type mechanical seal used for the nuclear main pump is characterized in that shallow grooves with cambered surfaces as bottom faces are formed in the sealing end face of a movable ring or a fixed ring; the cambered surfaces are part of a smooth and continuous cambered surface formed by the movement trail when a circumference moves according to the motion law in a three-dimensional space; and the cambered surface grooves each have a three-dimensional convergence shape which is gradually shallowed and narrowed from the high-pressure side to the low-pressure side and have a stronger convergence characteristic. Each cambered surface groove can be accurately formed through a grinding method; and the machining accuracy is high. Compared with an ordinary fluid dynamic pressure type mechanical seal used for the nuclear main pump, the fluid dynamic pressure effect is stronger, the fluid film rigidity is higher, stability and reliability are higher, and the service life is longer. Compared with the ordinary mechanical seal system for the nuclear main pump, safety is higher, and the stable running time is longer.

The invention provides a rectification polymerization inhibition method of N-vinylpyrrolidone (NVP). A polymerization inhibitor is stirred to be dissolved in a dissolving tank filled with a small amount of NVP crude product; and the dissolved NVP crude product containing polymerization inhibitor is quantitatively added into a rectification material via a metering tank in a continuous and dropwise addition mode or one-step mode, thereby ensuring the sufficient amount of the polymerization inhibitor in the rectification material and having the function of preventing NVP from polymerization. The method provided by the invention has the advantages of simple technique and higher product yield, reduces the waste residues, enhances the production efficiency, lowers the production cost, and also lowers the environmental pollution.

The invention relates to a hydrostatic and hydrodynamic combined type three-stage mechanical seal device for a nuclear main pump, which comprises three-stage seals connected in series and is characterized in that the first-stage seal is a hydrostatic mechanical seal, the second-stage seal is a hydrodynamic mechanical seal, and the third-stage seal is a contact type mechanical seal. In the second-stage hydrodynamic mechanical seal, on the sealing end surface of a second-stage seal dynamic ring or a second-stage seal static ring, a plurality of groups of fluid shaped grooves which are uniformlydistributed along the circumferential direction are arranged outside the sealing end surface, and each group of shaped grooves comprise an arc groove and a left inclined groove and a right inclined groove which are symmetrically distributed by using the arc groove as a center. In the invention, when the nuclear main pump is in the normal working state, the first-stage hydrostatic mechanical seal bears most of the pressure of the system and runs stably; and after the first-stage seal fails, the second-stage mechanical seal completely can bear the pressure of the whole system and run stably andreliably.

The invention discloses a sound wave reinforced fine particle removing device and a removing method thereof. The device comprises an aerosol turbulence and sound wave pretreatment area, an aerosol turbulence and sound wave agglomeration area, an aerosol dust collection area and an inertial sedimentation area which are sequentially communicated from top to bottom; the aerosol turbulence and sound wave pretreatment area and the aerosol turbulence and sound wave agglomeration area adopt a cyclone-like cutter structure with tangential air inlet; the aerosol turbulence and acoustic wave pretreatment area and the aerosol turbulence and acoustic wave agglomeration area adopt a counter-clockwise symmetrical air inlet mode; and the aerosol dust collection area and the inertial sedimentation dust collection area adopt cylindrical structures, and a cylinder wall adopts a water film dust collection plate structure. Aiming at aerosol particles discharged by a fixed source, the invention adopts a vertical integrated cylindrical structure form, realizes the efficient coagulation and removal of the aerosol particles, particularly fine particles, by a cooperative removal method combining a centrifugal separation technology, a sound wave agglomeration technology and an inertial sedimentation mechanism, and effectively avoids secondary dust raising, dust deposition and corrosion of a dust collection plate.

The invention belongs to a gasifying grey water hardness-removing turbidity-lowering device and a process method. The device comprises a three-stage flashing system which is connected with a clarifying tank through a grey water pipeline, a slurry outlet at the bottom of the clarifying tank is connected with a vacuum press filter through a discharging pump, a supernate outlet on the upper portion of the clarifying tank is connected with an inlet of a grey water tank through a T joint, an outlet of the grey water tank is connected with a to-be-used work section through a grey water pump, and thethird end of the T joint is connected with the inlet of the grey water tank through a grey water hardness-removing self-cleaning unit; the grey water hardness-removing self-cleaning unit comprises agrey water hardness-removing self-cleaning shell, an acidic gas exhaust port and a grey water inlet connected with the third end of the T joint are arranged at the top of the grey water hardness-removing self-cleaning shell, and a bottom outlet of the grey water hardness-removing self-cleaning shell is connected with a rotary screen portion. The device has the advantages of being simple in structure, reasonable in design, energy-saving, environment-friendly, low in running cost and capable of removing about 80% of hardness in grey water and effectively increasing stable running time of a gasifying grey water system.

The invention discloses a particulate matter online dilution sampling measurement system and method. A PM10 cyclone cutter, a PM2.5 cyclone cutter, a sampling gas-flow flowmeter, a primary diluter, asecondary diluter, a charge particle measurement device, a particulate matter filter, a flue gas flowmeter, a flue gas flow control valve and a sampling pump are orderly connected; compressed air provided by an air compressor is divided into three paths after entering a compressed air buffer and processing device: a dry and clean gas-flow path, a primary diluting gas-flow path and a secondary diluting gas-flow path; the drying cleaning gas-flow path leads to an inlet end of the dry and clean gas-flow ionization device, the primary diluting gas-flow path leads to a primary diluting gas-flow inlet of the primary diluter, and the secondary diluting gas-flow path leads to a secondary diluting gas-flow inlet of the primary diluter. The particulate matter online dilution sampling measurement system has obvious advantages that the particulate matter sampling measurement feedback is timely, the cooling and the diluting are enough, the pipeline clogging is avoided, the measurement result is accurate, and the system is long in stable running time.

The invention discloses a method and device for controlling clogging of a filler layer of a biofiltration device. The method disclosed by the invention comprises the following steps: heating the biofiltration device by a heating device and a coating of heat-conductive material, then introducing high-temperature gas (of which the temperature is not below 60 DEG C and the relative humidity is not below 50%) into the biofiltration device, particularly heating the section from a gas inlet to a gas outlet in the device, and keeping the gas temperature at the gas inlet and the gas temperature at the gas outlet not below 55 DEG C by the feedback control of a controller. By adopting the biofiltration device into which the high-temperature gas is introduced, the damaging effect of the high-temperature gas on microbial cells is used, thereby reducing the biomass in the biofiltration device, effectively controlling the problems of pressure drop and clogging of the filler layer, being applicable to biofiltration devices for treating various waste gases, and decreasing the maintenance cost brought about by clogging of the filler layer.

The invention relates to the technical field of coke oven gas benzene washing, in particular to a self-purification coke oven gas supergravity washing tower and a self-purification coke oven gas benzene washing system. The supergravity washing tower comprises: a shell provided with a coal gas inlet channel and a coal gas outlet channel; a washing and absorbing device comprising a filler layer, a washing liquid spraying device, a transmission shaft and a support frame; and a mist catching device comprising an internal mist catcher and an external mist catcher, wherein the filler layer is arranged in the center of the shell, the washing liquid spraying device is arranged above the filler layer, the transmission shaft and the support frame are arranged below the filler layer, the internal mist catcher is arranged at the bottom end of the coal gas outlet channel, and the external mist catcher is arranged at the top end of the coal gas outlet channel. The self-purification coke oven gas benzene washing system comprises the self-purification coke oven gas supergravity washing tower. According to the invention, a supergravity technology is utilized and improved, an efficient and stable benzene washing device is provided for coke oven gas benzene washing, and the defects that an existing benzene washing tower is low in washing absorption efficiency, large in occupied area, high in operation cost and the like are overcome.

The invention discloses a device and a method for efficiently removing fine particulate matters through temperature and humidity regulation and control. A box body structure with the same cross section structure size is adopted; the main body channels are arranged in series in a manner that flow channel center lines coincide; efficient removal of the particles with large and small particle sizes is achieved step by step in a regional mode through the forms of front-stage negative direct current pre-dedusting, primary flue gas temperature and humidity regulation and control, acoustoelectric coupling coagulation, secondary flue gas temperature and humidity regulation and control and rear-stage negative direct current dedusting in combination with gravity settling, filtering and trapping effects, condensation nucleation effects and acoustoelectric coupling effects for enhancing the collision coagulation effect of the fine particles. Local regulation and control of the flue gas temperatureand step-by-step humidification of the humidity are achieved through the series connection effect of the two-stage flue gas temperature and humidity regulation and control dust collection areas and the coupling effect of acoustic agglomeration and pulse electrocoagulation; meanwhile, the partition electrocoagulation effect of particulate matter with different particle sizes is achieved, and the trapping and removing effect of fine particulate matter is enhanced through the ash removal and dust collection effects of the movable grid plate and the movable electrode plate, and the removing efficiency of the fine particulate matter is high.

The invention provides a treatment method of MDI production tail gas. The method specifically comprises the following steps: condensingof MDI production tail gas in a rectifying tower through a two-stage cryogenic heat exchanger before the MDI production tail gas enters a vacuum unit is carried out; wherein the condensation temperature in a first-stage cryogenic heat exchanger is 0 to 15 DEG C, and the first-stage cryogenic heat exchanger is used for cooling most MDI into solid; and the condensation temperature in a second-stage cryogenic heat exchanger is -45 to -25 DEG C, and the second-stage cryogenic heat exchanger is used for cooling most PI and a part of chlorobenzene into solids. After cryogenic treatment, the content of MDI, PI and other light components in the tail gas can be reduced to an acceptable range for normal operation of a vacuum unit, and MDI with very high purity can be recovered after first-stage cryogenic treatment and is directly doped into an isocyanate product.In addition, PI and chlorobenzene can be reused in the front-stage MDI preparation process after being treated, resource comprehensive utilization maximization is achieved, and three wastes are prevented from being generated to pollute the environment.

The invention discloses a coke oven denitration pipe and a preparation method thereof and relates to a coke oven combustion waste gas purification technology. Nitride is combined with a silicon carbide material, the material has good thermal shock resistance and erosion resistance, and the production of the ultra-long ceramic denitration pipe is realized in a threaded connection manner, so that the long-term stable operation of a coke oven denitration system is ensured; the coke oven denitration pipe comprises a denitration pipe head, a plurality of denitration pipe middle sections in the middle, a denitration tail pipe, a metal joint and nozzles, wherein the denitration pipe head, the plurality of denitration pipe middle sections in the middle and the denitration tail pipe are sequentially connected in a threaded connection manner; and at least one row of nozzles which are distributed at intervals are distributed on the whole denitration pipe.

The invention belongs to the technical field of petrochemical engineering, relates to a method for preparing epoxide in a homogeneous system with low propylene using amount, and more specifically, relates to a method for synthesizing propylene epoxide by using a first protonic solvent and a second non-protonic solvent as a mixed solvent. An active center is formed by the first protonic solvent, acatalyst and hydrogen peroxide; the second non-protonic solvent can be miscible with the first protonic solvent, and the solubility of propylene inside the mixed solvent is added; the reaction is carried out under the condition of homogeneous phase; propylene can be in contact with hydrogen peroxide sufficiently, the utilization rate of propylene and hydrogen peroxide is improved, and the using amount of propylene and the decomposition rate of hydrogen peroxide are reduced. Simultaneously, the second non-protonic solvent has good solubility for an ether compound formed in the process of an epoxidation reaction, the catalyst deactivation caused by the blockage of a catalyst pore passage can be reduced, and the stable operation time of the catalyst is prolonged effectively. Moreover, the second non-protonic solvent is introduced, the proportion of the first protonic solvent in the system is reduced, the ether byproduct generated in further reaction of propylene epoxide and the first protonic solvent can be reduced, and the yield and selectivity of propylene epoxide are improved. The method has the characteristics of simple process route, low propylene using amount, high propylene epoxide yield and selectivity and the like, and the catalyst is unlikely to inactivate.

The invention discloses a gas cycling evaporation method and device, and aims to reduce evaporation energy consumption effectively and improve the stability and reliability of the operation of an evaporation system. The device comprises a first evaporator, a first condenser, a second evaporator and a second condenser, wherein the first evaporation is connected with a fluid material feeding pipeline and a high-boiling-point discharging pipeline; the first condenser is connected with a low-boiling-point discharging pipeline; a boosting and warming pipeline as well as a compression circulating medium pipeline are connected between the second evaporator and the second condenser; the second evaporator is connected with an external heat source medium input pipeline and an external heat source medium output pipeline; the circulating medium pipeline is connected with the first evaporator, the first condenser, the second condenser and the first evaporator in sequence and forms a loop; an internal heat source medium circuit is connected with the second evaporator and the first condenser.