44results about How to "Achieving long-term operation" patented technology

The invention relates to a method for producing isopropanolamine by a liquid ammonia process, mainly solving the problems such as high device investment, high energy consumption in dehydration and many by-products due to the fact that water is used as a catalyst in the prior art. The method has the advantages that anhydrous liquid ammonia and propylene oxide are used as raw materials for reaction,a tubular fixed bed reactor and an adiabatic fixed bed reactor are provided to ensure complete conversion of the propylene oxide, and the tubular fixed bed reactor removes heat of the hot water preheated reaction raw materials and reaction products under reduced pressure through heat removal of circulating hot water, so that most of reaction heat can be recycled; most of ammonia of the reaction products is recycled through a flash tank, and residual ammonia is recycled by an ammonia stripping tower with an compressor at the top; few by-products are generated, equipment investment and device energy consumption can be reduced, and the method can be applied to industrial production of the isopropanolamine.

The invention relates to the technology of heat exchangers, particularly a weldless plate-type heat exchanger. A plurality of fluid passages are formed by a plurality of heat exchange plates 1 which are vertically placed in a rectangularly (90 DEG) staggered manner, wherein, the openings of adjacent fluid passages among the fluid passages are mutually staggered at an angle of 90 DEG to form hot fluid passages and cold fluid passages; upward right-angled fold edges are formed on the two symmetric sides of each heat exchange plate 1, and right-angled double-fold edges are formed on the other two corresponding sides so as to form L-shaped fold edges; each two vertically adjacent heat exchange plates are placed in a rectangularly (90 DEG) staggered manner, that is, the downward L-shaped fold edge of an upper heat exchange plate is correspondingly placed between the upward right-angled fold edges of a lower heat exchanges plate, and the upward rectangular (90 DEG) fold edge of the lower heat exchange plate serves the function of limiting to the L-shaped fold edge of the upper heat exchange plate; a sealing gasket 5 is arranged between the lower heat exchange plate and the upper exchange plate; a flexible sealing layering 3 is arranged between each two adjacent heat exchange plates; and a support strip 2 is arranged between the passage formed by the upper heat exchange plate and thelower heat exchange plate.

The invention relates to a method of producing ethanolamine from liquid ammonia and mainly aims to solve the technical problems of a large amount of byproducts, low security, high investment in equipment and high energy consumption in the prior art. According to the technical scheme, ethylene oxide and fresh liquid ammonia are respectively added into a tubular fixed-bed reactor by a feeding pump, the product of reaction is added into an adiabatic fixed-bed reactor, and the tubular fixed-bed reactor and the adiabatic fixed-bed reactor are both filled with a binder-free ZSM-5 zeolite molecular sieve catalyst so as to catalyze ammoniation to generate ammonia-containing ethanolamine. By adopting the technical scheme, the problems can be well solved. The method provided by the invention can be applied to the industrial production of ethanolamine.

The invention discloses a method for preparing high purity sodium formate with the tail gas of a yellow phosphorus furnace; the tail gas of the yellow phosphorus furnace is firstly purified, and then reacts with alkali liquor to synthesize sodium formate. The invention is characterized in that the wet PDS is adopted for desulphurization; the desulphurized tail gas enters into a decarburization device, and PSA variable pressure is used for adsorption and decarburization; the purified tail gas reacts with alkali liquor under the conditions of 2.3-2.5 Mpa and 230 DEG C to synthesize sodium formate. The process can be described as follows: firstly the tail gas of the yellow phosphorus furnace is washed with first class water, pumped out by a water ring pump, and delivered to a second class water washing tower and a floating ball type water washing tower, and then delivered to a coke filter to filter the solid impurities and enters into a adsorber and a desulphurization tower; the desulphurized gas is delivered to the first part and the second part of a compressor, and then delivered to the decarburization device after being pressurized; the decarburized gas is delivered to the third part of the compressor, and pressurized to obtain purified feed gas which can react with the alkali liquor in a synthesizer to synthesize the sodium formate. The invention can realizes that the device for preparing high purity sodium formate with the tail gas of a yellow phosphorus furnace can run in large-scale, cleaning and long period, and is suitable to be used for the enterprises preparing high purity sodium formate with the tail gas of the yellow phosphorus furnace.

The invention relates to the field of petrochemical production and discloses a preparation method of low carbon olefin. The method comprises the following steps of: (1) heavy oil is contacted with andseparated from supercritical carbon dioxide to obtain a light fluid phase containing light oil and carbon dioxide, and a heavy fluid phase containing heavy oil; (2) the light fluid phase containing the light oil and carbon dioxide undergoes component separation to obtain light oil and carbon dioxide; and (3) the light oil is subjected to steam thermal cracking to obtain low carbon olefin. Throughthe above method, the heavy oil can be fully utilized, the problem of the shortage of the petrochemical raw material can be alleviated, and a cracking device can be operated for a long time. Moreover, in the preparation method of the invention, carbon dioxide is used, which not only avoids the greenhouse effect caused by the emission of carbon dioxide into the atmosphere but also recycles the carbon dioxide to achieve the effect of synergistic emission reduction.

The invention belongs to the technical field of preparation of coal based needle coke, and particularly relates to a coal based needle coke material pretreatment process, comprising the following steps: jointly stirring the cola based needle coke material, coal based solvent and petroleum based solvent, settling, dividing into a heavy phase and a light phase, pumping out the heavy phase and sending to the outside, distilling the light phase, wherein one part of gaseous phase after distillation is taken as overhead reflux, the other part is taken as a circulating solvent and returns to a mixingtank; enabling quinoline insoluble pitch and hydrogen-donor solvent to generate hydrogenation reaction in a hydrogenation reactor, sending the material after hydrogenation into a rectifying tower, wherein one part is taken as tower bottom reflux, and the other part is sent into the mixing tank at the bottom of the rectifying tower; cooling part of dehydrogenation solvent gaseous phase by a condenser at the top of the rectifying tower and then flowing into a tank at the top of the rectifying tower, wherein one part is taken as rectifying tower top reflux, the other part is heated by a heatingfurnace together with hydrogen and then sent into a hydrogen-donor solvent hydrogenation reactor, the hydrogen-donor solvent after re-hydrogenation is divided into gaseous phase circulating hydrogen and liquid phase circulating hydrogen-donor solvent by a gas-liquid separator.

The invention belongs to the technical field of petroleum processing, and concretely relate to a technology for processing alkylated waste acid by using a sulphur apparatus. In the technology, the upper part of a primary converter is filed with a catalysis protective agent, the lower part is filled with a multifunctional sulfur recovery catalyst; and the whole part of a secondary converter is filled with an alumina-based sulfur recovery catalyst. The technology realizes the low investment and high efficiency processing of the alkylated waste acid; SO3 in the high-temperature process gas can be processed in a reasonable mode, the apparatus corrosion problem is avoided, the SO3 conversion rate can reach 97% or more; influence of remainder iron in the waste acid is eliminated, the iron mass content in the sulphur product is less than 0.005%; the influence of carbon deposit on the catalyst is eliminated, and a claus catalyst is effectively protected. The catalyst can keep high claus catalytic activity and organic sulfur hydrolysis activity, the total sulfur conversion rate of the apparatus can reach 96.5% or more. The catalyst service life is prolonged, and the long-period operation of the sulphur recovery device is achieved.

The invention provides a pressure balancing type high-precision high-pressure-difference control valve which comprises a valve body and a pressure reducing channel. An inlet and an outlet are formed in the two sides of the valve body. The pressure reducing channel is composed of a valve core, a valve core sleeve and a valve base. A drainage runner is arranged between the valve core sleeve and thevalve body. A drainage opening communicating with the drainage runner is formed in the upper end of the valve core sleeve. The drainage runner communicates with the outlet. Multiple ring-shaped bossesare arranged on the inner wall face of the valve core sleeve at intervals. The valve base is arranged at the lower end of the valve core sleeve and communicates with the inlet. The valve core is arranged in the valve core sleeve and connected with the valve core sleeve in a sliding manner. A curved surface sealing face matched with the valve base is arranged at the lower end of the valve core. The valve core is provided with multiple buffering sets at intervals in the axial direction. Each buffering set comprises two buffering grooves arranged symmetrically. The adjacent buffering sets are arranged in a staggering manner. When the curved surface sealing face is matched with the valve base, the buffering grooves and the ring-shaped bosses are partially overlapped. According to the controlvalve, the valve core, the valve core sleeve and the valve base are adopted, control over high-pressure-difference media is achieved, adjusting performance is good, and adjusting precision is high.

The invention discloses a digital representation method of a coal-fired boiler operation state. The method comprises the steps that data is collected from four main tubes of a boiler; according to thecollected data, the corrosion rate of the boiler and parameters needed by the residual service life are calculated respectively; key data affecting boiler operation is screened out from the collecteddata according to corresponding boiler operation safety requirements; the residual wall thickness value of the boiler tubes, the residual service life value of the boiler and the smallest allowable thickness value of the boiler tubes are calculated respectively; the residual wall thickness valve, the residual service life value and real-time temperature and pressure values of the boiler are compared with specified allowable operation parameters of the boiler; the overall operation state of the boiler is judged; three state intervals are represented by different colors; different serial numbers are given to different boilers, and the serial numbers corresponding to the boilers are displayed through green, yellow and red on a display interface. The analysis accuracy of collected mass data is high, boiler real-time operation state health values can be visual, the tube burst frequency can be reduced, and long-period operation of the boiler is achieved.

The invention discloses a concentration device for a high-concentration and high-viscosity liquid. The concentration device mainly comprises a liquid storage tank, an osmosis device, an extracting solution storage tank and a circulating pump. According to the concentration device, a forward osmosis membrane is adopted as the osmosis device and matches an extracting solution, osmotic pressure difference is generated on the two sides of the forward osmosis membrane, heating and mechanical external pressure applying are not needed when high-concentration and high-viscosity liquid is concentrated, loss of nutritional ingredients is reduced, energy is saved, and the production cost is reduced; the osmosis device is arranged in the liquid storage tank, the surface of the osmosis membrane element can be kept clean for a long time, the service life is prolonged, and cleaning and maintenance are convenient; and the extracting solution can be replaced under the condition of not influencing the normal operation of the device, so that the long-period operation of the device is ensured.

The invention relates to a gas-liquid double-effect supramolecular corrosion inhibitor used for protecting condensate water pipe line steel and a preparation method thereof. The preparation method comprises the following steps: 30-70 parts by mass of cyclodextrin and derivatives form a network-like body under the effect of 10-20 parts by mass of an inductive bridging agent, and the network-like body is then subjected to noncovalent interaction with 20-40 parts by mass of oily corrosion inhibition components to form a supramolecular system with a subject and object structure. According to the gas-liquid double-effect supramolecular corrosion inhibitor used for protecting condensate water pipe line steel and the preparation method thereof, the preparation method of the supramolecular corrosion inhibitor is simple and convenient, the reaction condition is mild, the parts, being exposed to gas phase and immersed in liquid phase, of the condensate water pipe line steel are effectively protected.

The invention discloses a gas retort, which comprises a plurality of retorting sub units and performs retorting and oil-refining to oil shale by the gas full-cycle technology. The combined type gas full-cycle gas retort is characterized by using gas generated in the retorting process of the oil shale as heat carrier to retort the oil shale, using cold gas to recycle semi-coke waste heat generated by the retorting of the oil shale, and using tracery walls to distribute the heat carrier, wherein a gas chamber, an inverted V-shaped beam, an inverted V-shaped baffle plate, tracery walls, a cooling water sleeve, a coke exhausting passage, a coke pusher, a scraper blade conveyor and a water sealing pond are arranged inside each retorting sub unit of the gas retort from top to bottom in sequence. The tracery walls of the retorting sub units are arranged vertical to the bottom part, and a passage is formed between every two tracery walls; spray holes for cold and heat recycle gases are arranged on the tracery walls. The actual daily capacity, which can reach more than 6000 tons, of the gas retort is in a direct proportion with the number of the retorting sub units. The combined type gas full-cycle gas retort is applicable to performing retorting and oil-refining to various oil shale with grain sizes of 5-75mm, low gas content, low fixed carbon content and low moisture content, and the oil recovery rate of the gas retort reaches about 90%.

The invention belongs to the technical field of energy conservation and environmental protection, and relates to an energy-saving heat exchange device in a chloroform rectification process, in particular to a chloroform rectification device and a rectification process. The chloroform rectification device comprises a chloroform rectifying tower, the bottom of the chloroform rectifying tower is provided with at least two reboilers, the reboilers are vertically arranged, the reboilers are tube type heat exchangers, lower end sockets of the reboilers are provided with settlement areas, the settlement areas are spaces capable of carrying out settlement, shell pass inlets of the reboilers are connected with a steam source, and the steam of the steam source is lower than 0.4 MPa. The problem of frequent blockage of the reboiler of the rectifying tower can be solved, so that long-period operation of the chloroform rectifying tower is realized, meanwhile, the energy consumption can be greatly reduced, and the production cost is saved.

The invention provides a combined device for catalyzing deep desulfurization of liquefied gas. The combined device comprises a hydrogen sulfide removing unit, a stand-by unit, a thioalcohol removing unit, a plurality of pipelines and a plurality of valves, wherein the hydrogen sulfide removing unit is used for removing hydrogen sulfide from catalyzed liquefied gas, the thioalcohol removing unit is used for removing thioalcohol from the catalyzed liquefied gas, the stand-by unit is used for removing the hydrogen sulfide or thioalcohol from the catalyzed liquefied gas, the pipelines and the valves are used in a matched manner, and then, at least two of the hydrogen sulfide removing unit, the stand-by unit and the thioalcohol removing unit can communicate with each other so as to remove the hydrogen sulfide and thioalcohol from the catalyzed liquefied gas. The combined device for catalyzing the deep desulfurization of the liquefied gas can adapt to a variety of abnormal conditions, the capability against fault disturbance is improved, and long-cycle operation is achieved.

A cryogenic separation process for preparing propylene through propane dehydrogenation of an Olflex process is mainly suitable for an Olflex propane dehydrogenation (PDH) project of UOP, cryogenic separation is carried out on a dehydrogenation reaction product gas-phase product, potential cooling capacity of liquid raw material propane gasification, circulating hydrogen and other energy are recycled, and the whole cryogenic separation process does not need external refrigeration, and is more energy-saving and environment-friendly. High-purity hydrogen is adopted as circulating hydrogen, so that cryogenic separation of reaction gas with a low hydrogen-hydrocarbon ratio can be realized, reduction of carbon deposition in a reaction zone of a propane dehydrogenation device is facilitated, and long-period operation of the device is realized.

The invention discloses a semisolid reference electrode used for a metal soil corrosion electrochemical system. The semisolid reference electrode comprises a salt bridge, an electrode cavity and an electrode inner core, the salt bridge comprises a polytef shell of a cylindrical structure, a saturated electrolyte chamber is arranged in the middle of the salt bridge longitudinally, a saturated electrolyte is a semisolid saturated potassium nitrate or saturated potassium chloride, a porous sand core A is arranged at the end of the saturated electrolyte chamber, the top end of the porous sand core A directly contacts with soil, the electrode cavity is connected with the polytef shell through a thread, and the electrode inner core is connected with the electrode cavity through a thread. Medium-long-term running of the semisolid reference electrode in a soil medium is realized while good sealing effect of the electrolyte in the reference electrode and the salt bridge is guaranteed with temperature conditions changed constantly, so that accuracy and smoothness of metal corrosion electrochemical experiments in the soil medium are guaranteed.