1780 results about "Reboiler" patented technology

The invention discloses a dynamic intelligent control method and system for improving the efficiency of a rectifying tower, particularly relates to the technical field of chemical process control, and is used for solving the technical defect that an operation variable is mismatched with a physical state due to the fact that an existing distributed control system cannot recognize a hidden degradation state of equipment. The method comprises the following steps: acquiring temperature gradient distribution of each tower plate of a rectifying tower, thermal load of a reboiler and tower top condensation load parameters in real time, calculating a mass transfer efficiency offset by combining the temperature gradient distribution to generate a scaling trend index, and synchronously calculating a local entropy yield based on the thermal load and the condensation load to generate a thermodynamic irreversibility index. When the double indexes exceed a preset threshold value, it is judged that a recessive degradation state is entered, then a backflow ratio correction coefficient is reversely derived through a dynamic correlation model, and the correction coefficient is input into a distributed control system to dynamically adjust backflow ratio operation parameters; the product purity is maintained, the tower plate scaling process is obviously delayed, and long-term efficient operation of the rectifying tower is guaranteed.

The invention discloses argon recovery equipment capable of achieving stable rectification and a working method thereof.The argon recovery equipment capable of achieving stable rectification comprises a rectification system, the rectification system comprises a temperature adjusting mechanism and an argon extraction unit, and the argon extraction unit comprises a pure argon tower, an argon tower reboiler, a pure argon pipe set, a first valve set and a stability increasing component; the stability augmentation component comprises a stability augmentation assembly and a temperature detection piece, and the stability augmentation assembly comprises a nitrogen compressor and a nitrogen reboiler. According to the amount of pure argon gasified through heat exchange between pure liquid argon obtained through rectification in the pure argon tower and dried crude argon obtained after cooling in the argon tower reboiler, the supply amount of dry nitrogen is adaptively adjusted through the stability augmentation component so as to adjust the amount of pure argon supplied to the pure argon tower by the nitrogen reboiler; the argon extraction unit and the argon tower reboiler are jointly matched with the actual working condition of the argon tower reboiler, so that the anti-interference capability of the argon extraction unit is improved, the stability of the rectification process is ensured, and the purity of the obtained pure argon is ensured.

The present invention relates to the technical field of solvent purification, and discloses a propylene glycol methyl ether acetate purification control method and a propylene glycol methyl ether acetate purification process, the propylene glycol methyl ether acetate purification control system comprises a rectification device and a rectification control system, the rectification device comprises a rectification tower, a raw material preheater, a condenser, a reflux tank and a reboiler, the rectification control system comprises an environment temperature measuring unit, a tower top temperature measuring unit, a tower bottom temperature measuring unit, a feeding temperature measuring unit and a regulation and control module, the rectification control system is pre-trained with a parameter prediction model, and the parameter prediction model takes the environment temperature, the tower top temperature, the tower bottom temperature and the feeding temperature as input to output regulation and control parameters. The regulation and control parameters comprise the opening degree of a steam valve, the power of a condenser and the opening degree of a return valve, a primary distribution controlled parameter is obtained according to a preset distribution strategy, the primary distribution controlled parameter is specifically the optimized regulation and control parameter, and the tower top temperature is controlled within a preset tower top temperature range according to the primary distribution controlled parameter.

The utility model relates to the technical field of heat pump rectification, and particularly discloses a heat pump rectification system which comprises a rectification tower; the tower top gas liquefaction system comprises a compressor connected with a gas phase at the top of the rectifying tower, and a reboiler, a throttling device, a condenser and a flow divider which are sequentially connected with the compressor; liquid phase connection at the bottom of the rectifying tower is communicated with the reboiler, the tower bottom reboiling system comprises an auxiliary reboiler and a flash evaporator which are sequentially communicated with the reboiler, and the flash evaporator is communicated to the rectifying tower; and the gas phase at the top of the rectifying tower is heated by the compressor and then enters the reboiler to exchange heat with the liquid phase at the bottom of the rectifying tower, so that the rectifying energy consumption can be reduced, and the energy-saving effect is achieved.

The invention provides a preparation device and process of electronic-grade silane. According to the preparation device, a first disproportionation reaction is carried out on the basis of the first reactor, dichlorosilane is rectified and separated to serve as a raw material for a second disproportionation reaction, silane can be obtained on the basis of cheap trichlorosilane and a catalytic reagent, and electronic-grade silane can be obtained on the basis of traditional purification after rectification; based on heat exchange between tower top materials of the rectifying tower I and a tower kettle reboiler of the rectifying tower II, differential pressure thermal coupling integration is realized, condensing equipment and operation steps can be omitted, energy consumption is reduced, and the defects of high preparation cost and high energy consumption of a silane preparation device in the prior art are overcome.

The invention belongs to the field of environment-friendly gas purification and energy conservation, and discloses a desulfurization and decarbonization method and system. The desulfurization and decarbonization system comprises a flue gas absorption system and an amine liquid regeneration system, the flue gas regeneration system comprises an absorption tower, a high-temperature rich and lean liquid heat exchanger, a low-temperature rich and lean liquid heat exchanger and a heat pump system; the amine liquid regeneration system comprises a regeneration tower, a thermal coupling reboiler, a high-pressure reflux tank, a reboiler, a low-pressure flash tank, a barren liquor low-temperature cooler and a steam flash tank. The desulfurization and decarbonization method comprises the following steps: in an absorption tower, performing countercurrent contact on amine liquid and raw material gas, and absorbing acid gas in the raw material gas to generate an amino salt compound, so as to obtain amine-rich liquid; the amine-rich liquid enters a regeneration low-pressure tower and a regeneration high-pressure tower, the amino salt compound is regenerated to release acid gas to generate amine liquid, and the amine liquid returns to the absorption tower. By utilizing a high-low pressure regenerative thermal coupling technology and a heat pump technology, the energy consumption of the system is effectively reduced, the overall absorption efficiency is improved, and the equipment investment and site arrangement are saved.

The utility model provides a crude methanol cascade heat pump energy-saving device which comprises a pre-rectifying tower and a normal pressure rectifying tower which are connected in sequence, the bottom of the pre-rectifying tower is connected with a pre-tower reboiler, the normal pressure rectifying tower is connected with N normal pressure tower reboilers, the top of the pre-rectifying tower is connected with a pre-tower heat pump, the pre-tower heat pump is connected with the pre-tower reboiler, and the N normal pressure tower reboilers are connected with N normal pressure tower reboilers. The pre-tower reboiler is connected with a pre-tower reflux device, the top of the normal-pressure rectifying tower is connected with M normal-pressure tower heat pumps, M is equal to N, and M and N are greater than or equal to 2; the atmospheric tower heat pumps are respectively connected with atmospheric tower reboilers, and the N atmospheric tower reboilers are all connected with a refined methanol extraction device; according to the invention, the traditional methanol rectification process is changed, the tower is supplied with heat in a stepped manner through a steam direct compression type heat pump energy-saving technology at the top of the normal-pressure rectification tower, efficient stepped recovery of waste heat energy at the top of the normal-pressure rectification tower is facilitated, production operation is facilitated, and energy consumption is reduced.

The invention discloses a system for utilizing waste heat of an intermediate liquid at the top of a desorption tower. The system comprises the desorption tower, a waste heat recovery device, an intermediate tower tray and a reboiler, a first material pipeline is led out from the middle tray to enter a waste heat recovery device, and enters a reboiler after being heated, so that the middle tray of the desorption tower, the waste heat recovery device and the reboiler are sequentially communicated to form a waste heat recovery heating loop; the tower top of the desorption tower enters the waste heat recovery device through a third material pipeline, and enters the tower top condenser after being cooled by the waste heat recovery device, so that the desorption tower is sequentially communicated with the waste heat recovery device and the tower top condenser to form a waste heat recovery cooling loop. According to the waste heat utilization system, on one hand, waste heat of steam at the tower top is recycled, the waste heat discharge amount of the system is reduced, on the other hand, an intermediate liquid material is heated, low-grade waste heat is used for replacing a high-temperature heat source of the reboiler at the tower bottom through the waste heat recovery device, the process steam consumption of the reboiler at the tower bottom of the desorption tower is reduced, and a large amount of steam is saved.

The invention relates to the technical field of potassium tert-butoxide preparation, in particular to potassium tert-butoxide refining equipment which comprises a rectifying tower, a reboiler, a cooler and a phase splitter, the crystallization tower is located on the outer side of the rectifying tower, a rectifying chamber of the rectifying tower is connected with a crystallization chamber of the crystallization tower through the pre-filtering assembly, and the heater is installed at the bottom of the crystallization chamber of the crystallization tower; the input end of the low-pressure exhaust pipe is connected with the top of a crystallization chamber of the crystallization tower, the output end of the low-pressure exhaust pipe is connected with the input end of the cooler, the discharging pipe is installed on the side wall of the upper portion of the crystallization tower and communicated with the crystallization chamber of the crystallization tower, and the flashboard is inserted into the discharging pipe in a lifting mode. And the filter plate hopper is mounted in a crystallization chamber of the crystallization tower in a lifting and sliding manner. The azeotropic distillation kettle liquid can be subjected to efficient evaporation drying, redispersion, cooling crystallization and other processes after azeotropic distillation, potassium tert-butoxide can be efficiently discharged, and the practicability is good.

The utility model discloses equipment for producing high-purity methyl ethyl ether, which relates to the field of synthesis of chemical compounds and comprises a reaction device, a heating component, a cold bath tank, a crude product receiving tank, a heavy component removal tower, a light component removal tower, a first reboiler, a second reboiler, a first condenser, a second condenser, a recovery tank, a product receiving tank and a controller, raw materials including sodium methoxide and halogenated ethane directly react under the anhydrous condition, a catalyst is not needed, crude methyl ethyl ether is produced, then the crude methyl ethyl ether enters a heavy component removal tower, crude methyl ethyl ether gas with heavy components removed enters a light component removal tower from the top of the light component removal tower after being detected to be qualified through a first online analysis and detection component, light component removal rectification is conducted, and methyl ethyl ether is obtained. Gas-phase impurities at the top of the light component removal tower are analyzed through the second online analysis and detection part, when the gas-phase impurities are detected to be qualified, the methyl ethyl ether product enters the product receiving tank, and then the high-purity methyl ethyl ether product is produced through continuous rectification, so that the product purity is high, the reaction temperature is low, the energy consumption is reduced, the reaction yield is high, and the production cost is low.

The utility model relates to a low-temperature decompression continuous catalytic rectifying tower for synthesizing diacetone alcohol, which comprises a catalytic rectifying tower, a condenser and a built-in reboiler, the catalytic rectifying tower comprises a reaction section and a stripping section, and a feed port of the catalytic rectifying tower is positioned between the reaction section and the stripping section. The external condenser is arranged at the tower top of the catalytic rectifying tower, the inlet end of the condenser is connected with a tower top outlet of the catalytic rectifying tower, the outlet end of the condenser is connected with a tower top side inlet of the catalytic rectifying tower, the built-in reboiler is arranged at the tower bottom of the catalytic rectifying tower, and a tower kettle extraction port is formed in the bottom of the catalytic rectifying tower. According to the utility model, not only is the reaction conversion rate (gt: 99.9%) obviously improved, but also the reaction selectivity reaches 100%, the generation of byproducts and the decomposition of diacetone alcohol are avoided, the reaction energy consumption is reduced, in addition, the product does not need to be subsequently separated, and the catalyst does not need to be separated and recycled.

The invention relates to the technical field of heat exchange equipment, in particular to baffle plate welding and fixing equipment in a kettle type reboiler with a multi-anti-vibration structure, which comprises a workbench, a controller, fixing seats and rails, the controller is mounted at the top end of the workbench, and the two ends of the two rails are respectively provided with a group of fixing seats; the bottom ends of the fixing seat and the rail are connected with the top end of the workbench, the baffle plate frame welding device further comprises a supporting assembly and a welding assembly, the supporting assembly is installed at the top end of the workbench, the baffle plate frame can only rotate on the supporting assembly, the welding assembly is arranged at the top end of the workbench, and the welding assembly is used for welding the baffle plate frame and the square block; when the device is used, the supporting pipe penetrates through the multiple sets of baffle plates and is fixedly connected with a pipe plate to form a baffle plate frame, then the baffle plate frame is placed on the supporting assembly, and then the welding assembly is controlled by the controller to weld square blocks on each set of baffle plates, so that the machining efficiency is improved, and the labor intensity of workers is relieved.

The invention relates to the technical field of rectification, in particular to a rectifying tower for cracking C9 fractions, which comprises a tower body and a tower plate, the tower plate is arranged in the tower body, a CPD extraction device is arranged at the top end of the tower body, a DCPD side line extraction device is arranged in the middle of the tower body, and the lower part of the tower body is communicated with a solvent side line extraction device; a partition plate is arranged in the bottom end of the tower body, the space at the bottom of the tower body is divided into a flash evaporation space and a concentration space by the partition plate, the flash evaporation space is communicated with a C9 fraction supply pipeline through a cracking reactor, and the flash evaporation space is communicated with a tower kettle liquid return pipeline; a solvent extracted by the solvent side-draw device is mixed with tower bottoms extracted from the tower bottoms reflux pipeline, and then is heated by the reboiler and refluxed to the concentration space, and the concentration space is provided with a tower bottoms discharge pipeline; the influence of coking of materials in the rectifying tower or polymers on the rectifying operation can be reduced, and the stability of the rectifying operation is ensured.

The utility model discloses a heat source optimizing device for a reboiler of a methanol pre-rectifying tower, which comprises the pre-rectifying tower and the reboiler, and is characterized in that a branch pipeline is separated from the crude methanol discharge of a tower kettle and is connected with a negative pressure flash tank, and the crude methanol in the negative pressure flash tank is subjected to gas-liquid separation through flash evaporation; the bottom of the negative-pressure flash tank is connected with a methanol circulating pump, and a liquid-phase material is conveyed to a first heat exchanger at the top of the tower and returns to the negative-pressure flash tank after exchanging heat with steam at the top of the tower; a gas-phase material in the negative-pressure flash tank enters a compressor, is compressed and heated and then returns to the tower kettle of the pre-rectifying tower; according to the utility model, the process is improved by combining flash evaporation of a tower kettle discharge part with heat pump rectification, and meanwhile, the flash evaporation liquid is recycled to recycle steam heat at the top of the tower, so that the steam consumption of a reboiler of the methanol pre-rectifying tower and the use amount of circulating water at the top of the tower are effectively reduced, meanwhile, the reboiler does not need to be added, and the compression ratio of a heat pump compressor can be reduced.

The invention provides a fused salt extractive distillation separation method of zirconium-hafnium tetrachloride, which is particularly suitable for a fused salt extractive distillation separation device. When the fused salt extractive distillation separation is carried out, main components such as a distillation tower, a sublimator, a reflux tank, a condenser, a reboiler and a circulating tank are connected, then a zirconium and hafnium chloride raw material to be separated and chloride salt for distillation are filled, and finally the device is started to realize the separation of zirconium and hafnium chlorides under the distillation condition. The separation device and method have good usability and process adaptability, the prepared zirconium tetrachloride and hafnium tetrachloride meet the use requirements in the fields of atomic energy, aerospace, high-power laser, integrated circuits and the like, and reference and guidance are provided for research, development and application of zirconium and hafnium tetrachloride molten salt rectification separation technology and equipment.

The invention relates to the field of heavy water production, and discloses an energy-saving rectification heavy water separation process which comprises the following steps: (1) heating feed water, and carrying out primary rectification; (2) compressing steam at the top of the first-stage rectifying tower, then supplying heat to a first reboiler, performing heat exchange condensation on the compressed steam to form tower top produced liquid for first-stage rectification, enabling one part of the tower top produced liquid to flow back to the first-stage rectifying tower, and discharging the other part of the tower top produced liquid as first-stage rectification distillate; (3) a stripping section base solution of the first-stage rectifying tower flows into a first reboiler, and a part of the stripping section base solution is boiled to form rising steam; the rest part enters a tower kettle and is extracted as heavy water or used as feeding water for next-stage rectification; and (4) carrying out N-stage rectification and purification until the heavy water meets the purity requirement. According to the scheme, the boiling difference between water and heavy water is extremely small, tower top condensation heat is equivalent to a heat source required by a tower kettle, tower top steam is used for providing heat for the tower kettle, latent heat of steam is fully utilized, energy consumption is greatly reduced, and a large number of heat sources can be obtained with a small amount of power consumption.

The invention provides a four-tower reverse double-hot-trap double-effect methanol rectification energy-saving device and a process method.The four-tower reverse double-hot-trap double-effect methanol rectification energy-saving device comprises a pre-rectification tower, a vacuum rectification tower, a high-pressure rectification tower and a recovery tower which are sequentially connected, and the lower portion of the pre-rectification tower is connected with two reboilers; the lower parts of the vacuum rectifying tower and the high-pressure rectifying tower are respectively connected with a vacuum rectifying tower reboiler and a high-pressure rectifying tower reboiler; and the lower part of the recovery tower is connected with two reboilers. Wherein part of gas at the top of the high-pressure rectifying tower supplies heat to a vacuum rectifying tower reboiler, part of gas supplies heat to a pre-rectifying tower reboiler II, and a small part of top gas enters the pre-rectifying tower through a vacuum rectifying tower top vacuum injection pump and a recovery tower top vacuum injection pump to generate low pressure, so that negative pressure of the vacuum rectifying tower and the recovery tower is realized; and high-temperature wastewater produced at the bottom of the high-pressure rectifying tower supplies heat to the reboiler I of the recovery tower. Compared with the Haldor Topsoe flow process, the unit consumption of the steam for producing the refined methanol is reduced by 10-20%, and the obvious energy-saving effect of the methanol rectification flow process can be realized.

The invention discloses a storage medium, and an optimization method, device and equipment for a multi-effect rectification process flow. The method comprises the following steps: constructing a mechanism model comprising each rectification tower in a multi-effect rectification system; respectively constructing a first correlation function and a second correlation function; generating a data set of a preset group number of process parameters; the data set serves as input, and the reboiler thermal load of the highest-pressure rectifying tower is obtained through mechanism model calculation and serves as theoretical output; taking the data set of the process parameters and theoretical output as modeling data, and generating a prediction model capable of predicting the thermal load of the reboiler of the highest-pressure rectifying tower according to the process parameters through deep learning; and obtaining predicted parameter values of the controllable process parameters when the maximum pressure rectifying tower reboiler has the minimum energy consumption through the prediction model. According to the method, the number of process parameters participating in calculation and the solving difficulty in subsequent optimization calculation can be greatly reduced, and the calculation efficiency of obtaining the optimal solution can be effectively improved.

Disclosed herein are systems and embodiments for improving energy efficiency of a chemical separations plant through heat integration. Heat integration may provide heating loops between distillation columns and / or integrated electric heating components configured to supply heat to reboilers in the chemical separations plant. Heat integration may use heat from an associated chemical synthesis plant configured to carry out an exothermic reaction (e.g., production of methanol from CO2 and H2). Such integrated process designs allow for the use of “low-grade” heat, thereby improving energy efficiency. Furthermore, such integrated process designs allow for electrification of exemplary chemical separations plants, replacing the use of steam as a heating medium with more energy efficient and carbon-emission neutral, electrical methods.

The invention provides an NMP waste liquid rectification system and process for a lithium battery, and relates to the technical field of NMP waste liquid treatment. The rectification system comprises a dehydrating tower and a product tower which are connected in series, the dehydrating tower is connected with the raw material tank, a condenser 1 is arranged at the top of the dehydrating tower, a reboiler 1 is arranged at the bottom of the dehydrating tower, and the bottom of the dehydrating tower is connected with the product tower; a condenser 2 is connected to the top of the product tower, a reboiler 2 is arranged at the bottom of the product tower, a concentrator is connected to the bottom of the product tower, and a kettle residue discharge outlet is formed in the bottom of the concentrator; a condenser 3 is arranged at a side line extraction opening of the product tower and is connected with a finished product storage tank; and a plurality of layers of tower plates are arranged in the dehydrating tower and the product tower, and are filled with structured packing. The preparation process comprises the following steps: dehydrating and removing amine, extracting a main product from a side line, and recycling a high-boiling residue. According to the invention, double towers are used together, and the product is extracted from a side line and has high quality; and more heat sources are saved, the production cost is low, and operation is easy and safe.

The present invention provides a device for refining cyclohexanone by dehydrogenation of cyclohexanol, comprising an alcohol first tower, a dehydrogenation reactor, a dehydrogenation heat exchanger, an alcohol tower feed heat exchanger, a light first tower, a coupled reboiler, a light second tower, a ketone tower, and an alcohol second tower. The device of the present invention redesigns the six-tower process to achieve the refining and separation of cyclohexanol dehydrogenation materials, and couples and utilizes the available heat source and cold source. Using the device of the present invention to purify cyclohexanone can improve the product yield while saving steam consumption, reducing the operating cost of the device, and reducing the discharge of three wastes.

The invention discloses a clustered electric heating type low-temperature reboiler, and relates to the field of low-temperature liquid heating equipment, the clustered electric heating type low-temperature reboiler comprises a rectifying tower, a plurality of liquid storage cylinders and a plurality of electric heating wire fixing assemblies, the bottom of the rectifying tower is provided with the plurality of liquid storage cylinders, and the plurality of electric heating wire fixing assemblies are detachably connected to the liquid storage cylinders; specifically, the electric heating wire fixing assembly comprises an annular body defined by two semi-annular bodies, the opposite ends of the two semi-annular bodies are hinged together, the other opposite ends of the two semi-annular bodies are connected together in a clamped mode, the annular body is arranged on the first groove of the liquid storage cylinder in a sleeved mode, a cavity is formed in each semi-annular body, and an electric heating wire is arranged in each cavity in a penetrating mode. The reboiler is ingenious in conception and reasonable in layout, the electric heating element is convenient to disassemble and replace through improvement of the electric heating wire fixing assembly, normal and efficient work of the reboiler is guaranteed, and the problem that in the prior art, an electric heater is inconvenient to disassemble when fixedly connected is solved.

The utility model provides an atmospheric and vacuum five-tower distillation device with an energy-saving effect, which comprises a primary distillation tower, a negative pressure tower, an atmospheric tower and a vacuum tower, the negative pressure tower comprises a first negative pressure tower and a second negative pressure tower, the top of the first negative pressure tower and the top of the second negative pressure tower are respectively connected with a first negative pressure tower reflux device and a second negative pressure tower reflux device; a negative pressure tower reboiler is arranged at the middle lower part of the negative pressure tower I, and the pressure of the negative pressure tower I is higher than that of the negative pressure tower II; the two negative pressure towers are additionally arranged between the primary tower and the atmospheric tower, vaporized gasoline and kerosene components can be separated in time, the irreversible degree of heating and cooling is reduced, and the purpose of saving energy is achieved; due to negative pressure operation of the first negative pressure tower and the second negative pressure tower, the operation temperature in the two negative pressure towers is reduced, utilization of low-grade heat of the system is facilitated, it is guaranteed that all gasoline components and part of kerosene components of crude oil are completely extracted before entering the atmospheric towers, energy consumption is reduced, the heat utilization rate is increased, and the crude oil separation precision is improved.

The utility model discloses a methanol aqueous solution heat pump rectification system which comprises a first-stage preheater, a second-stage preheater, a third-stage preheater, a rectification tower, a compressor, an evaporator, a condensate water tank, a stripping tower, a reboiler, a first pump, a second pump and a third pump. According to the utility model, the methanol in the methanol aqueous solution can be extracted with high purity in a rectification manner, the treated wastewater can be directly discharged after reaching the discharge standard, the heat pump system reduces the consumption of steam and circulating water, and compared with the traditional process, the energy consumption is reduced, and the operation cost is saved.

The invention provides a six-tower multi-effect rectification process and rectification device for crude methanol, and the device comprises a pre-rectification tower, a negative pressure rectification tower, a pressurized rectification tower, a normal pressure rectification tower and a recovery tower which are connected in sequence, the pressurizing rectifying tower and the secondary pressurizing rectifying tower are arranged in parallel, or the secondary pressurizing rectifying tower is arranged between the negative-pressure rectifying tower and the pressurizing rectifying tower, or the secondary pressurizing rectifying tower is arranged between the pressurizing rectifying tower and the normal-pressure rectifying tower; a secondary pressurizing tower reboiler is arranged at the lower part of the secondary pressurizing rectifying tower and is connected with a heat input device; according to the invention, heat of the heat input device is integrated into the rectification system, so that greater energy-saving and carbon-reducing benefits are achieved; a six-tower thermal coupling process is adopted, a heat exchange network is optimized, and the energy-saving space is enlarged; compared with the traditional methanol process, the unit consumption of steam can be reduced; and the methanol with the concentration of more than 99.99% can be extracted.

The invention relates to the field of heavy water production, and discloses a compression cycle heat supply heavy water rectification process which comprises the following steps: 1, carrying out primary rectification on feed water; 2, condensing tower top steam by a first-stage cooler to obtain tower top produced liquid, enabling one part of the produced liquid to flow back to a first-stage rectifying tower, discharging the other part of the produced liquid, pressurizing and heating a working medium heated by the first-stage cooler by a compressor, and feeding the working medium into a first-stage reboiler; 3, feeding one part of deuterium-enriched water of the tower kettle into a first-stage reboiler, boiling, returning to the bottom of the rectifying tower, taking the rest part as feed water for next-stage rectification, and returning a working medium cooled by the first-stage reboiler into a first-stage cooler through a first-stage expansion valve to be heated and evaporated; and 4, performing N-stage rectification and purification until the heavy water meets the purity requirement. By utilizing the characteristics that the boiling difference between water and heavy water is extremely small and the condensation heat of the tower kettle is equivalent to the heat source required by the tower kettle, the condensation heat of tower top steam is transferred to the tower kettle through the circulating working medium, the energy consumption is greatly reduced, and a large amount of heat sources can be provided for the system by a small amount of power consumption of the compressor.

The present invention relates to a method and device for treating ammonia nitrogen wastewater and recovering ammonia, belonging to the technical field of industrial wastewater treatment, including a deammonification tower, a heat pump reboiler, a heat pump condenser and a heat pump compressor; an ammonia nitrogen wastewater feed port is provided between the rectifying section and the stripping section of the deammonification tower, the rectifying section is provided with an ammonia-containing steam discharge port and a dilute ammonia water reflux port, and the stripping section is provided with a deammonified water discharge port and a stripping steam feed port; the deammonified water discharge port and the stripping steam feed port are circulated and connected to the heat pump reboiler; the ammonia-containing steam discharge port and the dilute ammonia water reflux port are circulated and connected to the heat pump condenser; the heat pump condenser and the heat pump reboiler are circulated and connected via a heat pump compressor to form a heat pump cycle. Heat pump working fluid steam is used to heat the heat pump reboiler, replacing the use of raw steam, saving energy and reducing consumption; the heat pump compressor pressurizes the non-toxic and harmless heat pump working fluid steam, solving the safety hazard problem of directly pressurizing ammonia-containing steam in the prior art.

The invention relates to the technical field of ethylene glycol diacetate preparation, and discloses ethylene glycol diacetate preparation reaction equipment, which comprises a tower body, a reboiler and a condenser, the top of the tower body is connected with the condenser, the bottom of the tower body is connected with the reboiler, a tower plate is installed in the tower body, the tower plate is driven to rotate in the tower body, and the tower plate has a first state and a second state, in the first state, the tower plate is of an L-shaped structure and is horizontally arranged, and in the second state, the tower plate is of a linear structure and is inclined downwards; the tower plate provided by the invention can be kept in the second state in the cleaning process, and when water flows on the tower plate in the second state, the tower plate is of a linear structure, so that the tower plate in the state does not influence impact force generated by flowing of the water, and the tower plate can be smoothly flushed.

The invention discloses a desorption tower kettle liquid waste heat utilization system based on an absorption heat pump principle. A tower kettle liquid circulation loop comprises a first material pipe which is led out from a desorption tower kettle, serves as a heated high-grade heat source and is connected to a waste heat utilization device; the waste heat flows out of the waste heat utilization device and is connected to the tower kettle through a second material pipe to form a closed loop; the barren amine liquid circulation loop comprises a barren liquid pipeline for pumping materials from the tower kettle of the desorption tower to the tower top of the absorption tower, and the barren liquid pipeline comprises a third material pipe entering the waste heat utilization device and a fourth material pipe flowing out of the waste heat utilization device. According to the desorption tower kettle liquid waste heat utilization system, on one hand, waste heat of lean amine liquid is recycled, the use amount of circulating water is reduced, on the other hand, low-grade heat sources in the lean amine liquid are recycled, materials in a desorption tower kettle are heated, low-grade waste heat is used for replacing a high-temperature heat source of a tower bottom reboiler through the waste heat recovery device, and the desorption tower kettle liquid waste heat utilization efficiency is improved. The process steam consumption of the reboiler at the bottom of the desorption tower is reduced, and a large amount of steam is saved.

The invention discloses a low-energy-consumption skid-mounted integrated NMP high-efficiency rectification device, and particularly relates to the technical field of chemical engineering, the low-energy-consumption skid-mounted integrated NMP high-efficiency rectification device comprises a mounting skid seat, a secondary dehydration tower, a primary dehydration tower, a primary rectification tower, a secondary rectification tower and a reboiler; the secondary dehydrating tower is detachably connected with the mounting prying seat through a bolt A; the primary dehydrating tower is detachably connected with the mounting prying seat through a bolt B; the primary rectifying tower is detachably connected with the mounting prying seat through a bolt C; the secondary rectifying tower is detachably connected with the mounting prying seat; the reboiler is communicated with the secondary dehydrating tower; the device is reasonable in structural design, and on the basis of the core principle of NMP rectification recovery, by optimizing the rectification process design, efficiently utilizing heat energy, only needing single heating and greatly reducing the heating times of waste liquid, the energy loss is fundamentally reduced, and the energy consumption is obviously saved; meanwhile, the overall height of the device is controlled to be less than ten meters, the requirement for the site space is greatly reduced, and the device can flexibly adapt to the land use situations of more enterprises.