214results about "Multiple-effect/fractional condensation" patented technology

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 invention provides an impurity deep removal and purification device in ES fiber solvent recovery. Relates to the technical field of electrostatic spinning process and solvent recovery, and comprises a pre-separation module used for removing fiber residues and solid particles larger than 5 microns in solvent-enriched gas; the multi-stage deep condensation module comprises two stages of condensers, and the two stages of condensers condense the solvent steam according to the gradually decreased temperature and intercept micro-droplet impurities; and the composite adsorption module is used for adsorbing residual organic trace impurities and removing water. The impurity deep removal and purification device in ES fiber solvent recovery has the advantages of being low in energy consumption, easy and convenient to maintain, stable in operation and capable of being continuously online for 72 h or above without shutdown, the solvent recovery rate is remarkably increased, the operation cost is reduced, and the potential risk of organic vapor emission to the environment and operation safety is effectively avoided.

A carbon dioxide recovery device provided with a separation device that separates carbon dioxide from to-be-separated gas (for example, combustion exhaust gas) containing carbon dioxide, wherein: in order from the upstream side where the to-be-separated gas is supplied, the separation device and carbon dioxide sublimators, which sublimate (solidify) carbon dioxide that was separated in the separation device, are connected in series, refrigerant circuits in which a fluid having cold heat serves as the refrigerant, are connected to the carbon dioxide sublimators, and the refrigerant is used to sublimate (solidify) the carbon dioxide; and when the carbon dioxide is sublimated (solidified), the carbon dioxide sublimators are depressurized and set to negative pressure so as to draw in the carbon dioxide separated at the separation device.

The invention provides a device for producing anhydrous hydrogen fluoride, which comprises a coarse cooler communicated with a gas outlet of a desulfurizer, a gas outlet of the coarse cooler is communicated with a gas inlet of a primary condenser, and a liquid outlet of the coarse cooler is communicated with a coarse distillation tower; the coarse coolers comprise the first coarse cooler and the second coarse cooler, and the first coarse cooler and the second coarse cooler are connected in series. The anhydrous hydrogen fluoride production device has the beneficial effects that the crude hydrogen fluoride gas is primarily cooled in the production process, so that the content of high-boiling-point substances in crude hydrogen fluoride condensed liquid is reduced, the operation cycle of an anhydrous hydrogen fluoride device production system is prolonged, and the quality of the product anhydrous hydrogen fluoride in a rectification system is improved.

The invention relates to a resourceful treatment method of desulfurization wastewater. The method comprises the following steps: adding the water treatment filler into the desulfurization wastewater; the method comprises the following steps: distilling desulfurization wastewater, collecting condensate in sections, and heating and distilling until the volume of the desulfurization wastewater is reduced to 70% of the initial volume to obtain first-stage condensate for recycling dilute ammonia water; continuously heating and distilling until the volume of the desulfurization wastewater is reduced to 20% from 70% of the initial volume to obtain a second-stage condensate; continuously heating and distilling until the volume of the desulfurization wastewater is reduced to 5% from 20% of the initial volume or is evaporated to dryness to obtain third-stage condensate, and using the second-stage condensate and the third-stage condensate for recycling dilute ammonia water or refluxing to the stock solution of the desulfurization wastewater for circular treatment or treating to reach the standard for reuse; the residual residues are subjected to innocent treatment, so that resourceful treatment of the desulfurization wastewater is The method solves the problems that the existing desulfurization wastewater treatment method is difficult to realize resource recycling, low in treatment efficiency, high in cost, easy to cause secondary pollution and difficult to discharge after reaching the standard.

The invention relates to the technical field of acetaminophen crystallization, in particular to a multi-stage continuous cooling crystallization device and method for acetaminophen. The invention provides a multi-stage continuous cooling crystallization method for acetaminophen, which comprises the following steps: S1, at least five stages of continuous cooling crystallization are adopted, and circulating water with a set temperature is injected into a jacket of a crystallization kettle during each stage of cooling crystallization; wherein during the first several stages of crystallization, the difference between the initial temperature of the material entering the crystallization kettle and the initial temperature of the circulating water is 13-25 DEG C; and during the last crystallization, the initial temperature of the material entering the crystallization kettle is 30-35 DEG C. According to the multi-stage continuous cooling crystallization method, different water temperatures are adopted to carry out gradient cooling on the materials, so that the problems of non-uniform grain size and low purity caused by crystal explosion due to large temperature difference between the materials and a refrigerant and high cooling rate in the early stage of cooling are avoided.

The invention relates to the technical field of methanol steam recovery, and discloses a marine skid-mounted methanol steam recovery method, which comprises the following steps: guiding methanol steam into a multi-stage gradient refrigeration condensation unit by using an induced draft fan, and carrying out multi-stage gradient refrigeration on the methanol steam so as to liquefy and separate water in the methanol steam, the methanol steam is partially liquefied to form methanol liquid and residual steam, and the methanol liquid and the residual steam are separated through a gas-liquid separator; the residual steam separated by the gas-liquid separator passes through an adsorption unit, the adsorption unit adsorbs and filters methanol steam in the residual steam, so that the content of the methanol steam in the residual steam is lower than the set content, and the residual steam adsorbed and filtered by the adsorption unit forms tail gas discharged outwards; by means of the double treatment modes of condensation and adsorption, efficient recovery of methanol steam is achieved, and meanwhile the requirements for environmental protection and economical efficiency of methanol steam recovery are met.

The invention belongs to the field of chemical production, and particularly relates to a chloromethane cooling recovery system and a chloromethane cooling recovery method. The chloromethane cooling recovery system provided by the invention comprises a first condenser, a second condenser, a third condenser and a recovered chloromethane storage tank, a shell pass inlet of the second condenser is connected with a tube pass outlet of the third condenser, and a tube pass inlet of the third condenser is used for introducing liquid chloromethane. Chloromethane is cooled and recovered by using a liquid chloromethane vaporization heat absorption principle, so that the economical efficiency is good; in addition, due to the fact that the to-be-cooled object and the refrigerant are both methyl chloride, even if mutual leakage occurs in the heat exchange process, the quality of recycled methyl chloride cannot be affected, and raw material losses cannot be caused.

Embodiments of the invention provide systems and methods for water treatment and / or desalination.

The invention relates to the field of silane production, and discloses an energy-saving type silane production and purification system which comprises a production unit used for converting trichlorosilane into silane gas and a chlorosilane compound and carrying out preliminary separation treatment on the silane gas and the chlorosilane compound. According to the invention, a disproportionation reaction rectification method is adopted, after pressurization by a compressor, the temperature and pressure of silane gas and other chlorosilane compounds are increased, and the boiling point of the chlorosilane compounds is increased, so that the chlorosilane compounds are more easily liquefied at a higher temperature, more effective condensation and separation in a precooler are facilitated, and the yield of the chlorosilane compounds is improved. And through the cooling effect of the precooler, part of the chlorosilane compound is condensed into a liquid state, so that preliminary separation of the chlorosilane compound and gaseous silane gas is realized, part of impurities are removed in advance, the content of the impurities entering the silane separation tower is reduced, and the separation efficiency of the separation tower is improved.

The invention relates to the technical field of energy systems, in particular to a methane gradient utilization system based on SOFC (solid oxide fuel cell) and copper chloride circulation, comprising a methane reforming and SOFC power generation unit for converting methane fuel into electric energy and combusting anode tail gas to generate high-temperature flue gas; the copper-chlorine circulating hydrogen production unit is connected with a high-temperature flue gas pipeline of the methane reforming and SOFC power generation unit, heat energy of the high-temperature flue gas is used for driving a copper-chlorine thermochemical circulating reaction, and hydrogen is prepared by taking water as a raw material; and the waste heat power generation and recovery unit is connected with a cathode tail gas pipeline of the methane reforming and SOFC power generation unit and a tail gas outlet pipeline of the copper chloride circulation hydrogen production unit, and is used for carrying out power generation and heat supply on waste heat in a cascade recovery system. According to the system, grade alignment and gradient utilization of energy are achieved, high-temperature waste gas of the SOFC system is sequentially used for driving copper-chlorine hydrogen production, ORC power generation and hot water supply, and the comprehensive utilization efficiency of energy is remarkably improved.

The invention relates to the technical field of synthetic leather industry, in particular to an integrated process and system for recycling VOCs from synthetic leather tail gas through multi-mode phase change condensation. The synthetic leather tail gas multi-mode phase change condensation VOCs recovery integrated process comprises the following steps: step 1, carrying out pre-condensation treatment on a mixed gas phase formed by VOCs and air to obtain a pre-condensed mixed gas phase; step 2, carrying out primary condensation treatment on the pre-condensed mixed gas phase, and converting part of DMF gas phase and a small amount of other gas phase in VOCs into liquid phase and recovering; and step 3, carrying out secondary condensation treatment on the uncondensed gas phase in the VOCs generated in the step 2, and converting the uncondensed gas phase in the VOCs into a liquid phase and recovering the liquid phase. According to the method, the recovery rate of the DMF gas phase in the VOCs is 99% or above through the multi-stage gradient condensation recovery process step, and the investment of a large amount of production cost is saved.

The present invention relates to the field of dehumidification technology, and in particular to an air treatment method, which includes obtaining air humidity requirements and air temperature requirements required for different environments, and determining a first limit dehumidification capacity and a second limit dehumidification capacity of a cooling medium according to the temperature of the cooling medium; when the air humidity requirement of an environment is within the dehumidification interval of the first limit dehumidification capacity, if the temperature of the treated air after dehumidification is lower than the air temperature requirement of the corresponding environment, driving a first dehumidification module to dehumidify and reheat the treated air; when the air humidity requirement of an environment is within the dehumidification interval of the second limit dehumidification capacity, driving a second dehumidification module to dehumidify the treated air; and when the air humidity requirement is within the dehumidification interval between the first limit dehumidification capacity and the second limit dehumidification capacity, driving a third dehumidification module or a fourth dehumidification module to cool the treated air.

The invention provides a hydrogen fluoride production system and method, and belongs to the technical field of hydrogen fluoride production, the hydrogen fluoride production system comprises a reaction unit, a purification unit and a rectification unit which are arranged in sequence, and the rectification unit comprises a rectification tower, a first cooler, a second cooler and a cold crude acid tank; the first cooler is provided with a first cooling medium channel and a first working medium channel, and an inlet of the first working medium channel communicates with an outlet of the purification unit; the second cooler is provided with a second cooling medium channel and a second working medium channel, an inlet of the second working medium channel is communicated with an outlet of the first working medium channel, an outlet of the first working medium channel is communicated with an inlet of the second working medium channel, and an outlet of the first cooling medium channel is communicated with the rectifying tower; according to the invention, the liquid hydrogen fluoride is stored in the cold crude acid tank, so that the liquid hydrogen fluoride cools the gaseous hydrogen fluoride in the first cooler, a coolant does not need to be purchased or supplemented, and the production cost is reduced.

A separation system for separating constituents from a solution by utilizing a carrier gas and a separation method thereof are disclosed. The separation system includes an evaporator, a solution distribution unit connected to the evaporator for distributing the solution into the evaporator, and a gas distribution unit connected to the evaporator for distributing the carrier gas into the evaporator. The solution is countercurrent to the carrier gas and upon contact, at least one constituent of the solution is vaporized and separated from the solution.

This invention relates to methods of employing multiple, different sorbents that capture and release a target chemical species in sequential order such that the release from the last sorbent has a higher concentration of the target species than otherwise could be attained by only using a single type of sorbent. The invention also employs one or more of these cascaded-sorbent units with energy recycling to attain higher energy efficiency defined as energy input per mass of target species collected. The invention also relates to a method to set the operating temperatures of the sorbents using a temperature control system that can exchange heat with passive or natural heat energy sources or heat sinks.

The invention provides a system and method for recycling methane chloride from methyl chlorosilane synthesis tail gas. According to the method, 85%-90% of methane chloride in the methyl chlorosilane synthesis tail gas is recycled in a three-stage sectional type condensation mode. 90-95% of residual methane chloride is recovered through directional absorption of dichloromethane; and finally, residual methane chloride is recovered in a decompression analysis and reflux impurity removal mode, the total recovery rate of methane chloride is larger than or equal to 99%, the purity of methane chloride is larger than or equal to 99.5%, waste of methane chloride is greatly reduced, high recovery of methane chloride is achieved, and methane chloride can be directly reused in a methyl chlorosilane synthesis reaction.

A method of producing useful fuel fluids from solid plastic waste, including loading solid plastic waste matter into a reaction chamber to define a load, subjecting the load to HTP to extract hydrocarbon mixtures, filtering the hydrocarbon mixtures to extract solid matter, and separating the hydrocarbon mixtures into a light fraction (C1 to C25) and a heavy fraction (C26 to C31). The heavy fraction is directed to a first container and the light fraction is directed to a second container. The light fraction is separated into diesel (C8-C25), gasoline (C4-C12), and vapor (C1-C5), and the diesel is directed to a third container, the gasoline is directed to a fourth container, and the vapor is directed to a fifth container. The hydrocarbon mixtures have a carbon number distribution between C1 and C31. The pressure in the reaction chamber is typically between 0.1 and 10 MPa and the temperature in the reaction chamber is between 350 and 500 degrees Celsius. The plastic waste is selected from the group consisting of PS, PE, PP, and mixtures thereof.

The invention relates to a deuterium water conversion and purification system, and belongs to the technical field of isotope separation and purification. The system comprises a deuterium gas supply unit, a deuterium gas electrochemical reaction conversion unit, a multi-stage condensation separation purification unit and a deuterium water storage unit. On the basis of deuterium gas supply pressure, non-stop automatic switching is triggered, and deuterium gas non-backflow control is executed through a backflow blocking mechanism; generating electric energy and tail gas containing deuterium water vapor based on continuously supplied deuterium gas and a drying oxidant; a gradient gas-liquid separation process and a closed-loop temperature control regulation mechanism are adopted to obtain primarily purified liquid deuterium water, and high-purity deuterium water is generated through a high-selectivity ion exchange adsorption process; and obtaining deuterium water storage capacity data and conductivity parameters, analyzing the deuterium water storage capacity data and the conductivity parameters with a preset conductivity parameter threshold value, and triggering purification material regeneration reminding. The system realizes collaborative linkage of deuterium gas supply, conversion, purification and storage monitoring, and ensures the continuity and purity stability of deuterium water preparation.

The invention discloses a carbon capture anti-corrosion system, and relates to the technical field of carbon capture. The carbon capture anti-corrosion system comprises an absorption tower, a desorption tower, a heat exchanger, a first spray head and a second spray head, the absorption tower is connected with a smoke inlet pipe, a first liquid discharge pipe and a first liquid inlet pipe, the desorption tower is connected with an exhaust pipe, a second liquid discharge pipe and a second liquid inlet pipe, and the heat exchanger is provided with a first heat exchange channel and a second heat exchange channel. The two ends of the first heat exchange channel are connected with the first liquid discharging pipe and the second liquid discharging pipe respectively, the two ends of the second heat exchange channel are connected with the first liquid feeding pipe and the second liquid discharging pipe respectively, the first spray head is arranged on the smoke inlet pipe and used for spraying barren liquor, and the second spray head is arranged on the desorption tower and used for spraying the barren liquor to the tower wall of the desorption tower. According to the carbon capture anti-corrosion system, the wet corrosion phenomenon occurring during operation of the carbon capture system can be effectively inhibited, the continuous production capacity of the carbon capture system is guaranteed, and the capital construction and operation cost of system equipment is reduced.

A system and method for controlling the temperature of a medium by refrigerant vaporization, working gas condensation, or a combination of both, the system including a container, at least one working gas storage tank having at least one storage tank section including a wall thermally coupled to a volume of medium within the container and having an exterior surface constructed to provide a volume of medium thermal coverage within the container, and a condenser for regulating working gas condensation in the storage tank, whereby the working gas storage tank forms a vapor space in each of the at least one storage tank section in response to receiving working gas and regulating condensation in the condenser to enable working gas condensation at or near a selected temperature of a volume of medium within the container thermally coupled to the respective storage tank section.

An apparatus for intense / rapid cooling and for removing a substance in suspension in a gaseous fluid, said apparatus comprising: i) conveying means (2) for conveying the gaseous fluid; ii) a system (3) for alternatively condensing / freezing or defrosting the substance present in the gaseous fluid comprising: - a first group (31) of cooling or defrosting stages; - a second group (32) of cooling or defrosting stages; - means for collecting the substance (347); - the conveying means (2) comprising a first and a second line (311, 321) operatively arranged in parallel; iii) a heat exchanger (4) for pre-cooling the gaseous fluid upstream of the first group (31) or second group (32); iv) the conveying means (2) comprising means (5) for transporting to the heat exchanger (4) the gaseous fluid that is present downstream of the first group (31) or second group (32) to remove heat from the gaseous fluid that is present upstream of the first group (31) or second group (32) and passes through the heat exchanger (4); v) directing means (6) for directing the fluid alternatively towards the first or towards the second line (311, 321), vi) a first fan (71) and a second fan (72) situated along the conveying means (2); the volumetric flow rate of the gaseous fluid generated by the first fan (71) being greater than the air flow rate generated by the second fan (72).

The invention provides a polymer production process tail gas treatment device and a tail gas treatment method, and belongs to the technical field of environmental protection and resource recycling, the treatment device comprises an adsorption and desorption kettle, the adsorption and desorption kettle is provided with an internal containing space, and a heat insulation partition plate is arranged in the internal containing space; the internal accommodating space is divided into a low-temperature adsorption area and a high-temperature desorption area which are independent from each other by the heat insulation partition plate, and an adsorption bed is also arranged in the internal accommodating space and is provided with a first part positioned in the low-temperature adsorption area and a second part positioned in the high-temperature desorption area; the adsorption bed can be driven to rotate around the geometric center of the adsorption bed so as to realize position switching of at least partial areas of the first part and the second part in the low-temperature adsorption area and the high-temperature desorption area respectively. Adsorption and desorption of the adsorption bed are guaranteed to be synchronously and continuously carried out, the treatment capacity of the device can be greatly improved, and the tail gas treatment efficiency is effectively improved.

The invention discloses a hazardous waste molten flue gas quenching-dust removal integrated heavy metal trapping device which comprises a first recovery treatment mechanism, a second recovery treatment mechanism and a cyclone dust collector. According to the invention, the residence time of the hazardous waste molten flue gas is greatly reduced, and the high-temperature flue gas can be rapidly cooled from 800 DEG C to 450 DEG C and 200 DEG C by using a heavy metal cascade condensation technology, a first recovery treatment mechanism and a second recovery treatment mechanism, so that the residence time of the flue gas in a temperature window where harmful substances are easily generated is greatly shortened, and the energy consumption is reduced. The generation probability of harmful substances such as dioxin is reduced, various heavy metals can be effectively recycled conveniently, residual particles in flue gas can be further removed through the cyclone dust collector, and residual tiny particles, toxic gases such as dioxin and the like can be efficiently captured by spraying activated carbon into the cyclone dust collector. And it is ensured that the exhaust gas finally discharged into the atmosphere meets the environmental protection standard.

The present invention provides a process and apparatus for preparing high-purity hydrogen sulfide, relating to the technical field of hydrogen sulfide preparation. The process comprises obtaining high-purity sulfur, melting the high-purity sulfur in a sulfur melting kettle to produce liquid high-purity sulfur, preparing hydrogen gas and heating the hydrogen gas, and then sending the liquid high-purity sulfur and the heated hydrogen gas to a reaction tower for reaction to produce high-purity hydrogen sulfide gas. In the present invention, the use of high-purity sulfur and high-purity hydrogen to prepare hydrogen sulfide can reduce the generation of impurity gases and improve the purity of the hydrogen sulfide gas.

The invention discloses a carbon emission online monitoring system with double-point fusion before and after desulfurization, and relates to the technical field of environmental monitoring and carbon emission control, the system comprises a desulfurization tower, a pre-desulfurization monitoring unit installed in a gas inlet pipeline of the desulfurization tower, a post-desulfurization monitoring unit installed in a gas outlet pipeline of the desulfurization tower, and two sets of gas pretreatment systems, and the data fusion processing modules are respectively integrated in the pre-desulfurization monitoring unit and the post-desulfurization monitoring unit, and are used for acquiring the pre-desulfurization concentration data and the post-desulfurization concentration data provided by the monitoring units, completing CO2 emission calculation and carbon emission factor fusion calculation in combination with flue gas parameters and desulfurizer consumption data, and outputting optimized carbon emission factors and CO2 accumulative emission. According to the method, gas synchronous online monitoring is carried out, double-point data are fused, and the accuracy and reliability of carbon emission accounting are improved.

The invention belongs to the technical field of sulfur preparation, and particularly relates to an acid gas sulfur recovery process with low sulfur emission. A Claus unit and a tail gas treatment unit are adopted in the low-sulfur-emission acid gas sulfur recovery process, and the tail gas treatment unit firstly performs selective hydrogenation on tail gas flow from the Claus unit and then performs subsequent treatment; the selective hydrogenation catalyst contains 2-3wt% of cobalt (calculated as CoO), 1.5-2wt% of nickel (calculated as NiO), 11-13wt% of molybdenum (calculated as MoO3), 3-4wt% of lanthanum (calculated as La2O3) and the balance of carrier components; the carrier comprises the following components in percentage by weight: 80 to 85 percent of TiO2 and the balance of CaSO4. The gas flow at the outlet of the selective hydrogenation reactor can reach a low-sulfur emission level after being treated by a conventional method, the technical requirement on a post-treatment process is relatively low, and a preorder Claus unit has relatively wide-range operation flexibility.

The invention discloses a gas-liquid-solid three-phase reaction device and process. The device comprises a reactor (a reaction zone I and a reaction zone II), a first-stage condenser, a second-stage condenser, a circulating delivery pump A, a circulating delivery pump B, a circulating heat exchanger, a circulating ejector, a double-Venturi ejector and a gas phase distributor. Compared with a traditional device process, the circulating ejector, the double-venturi ejector and the gas phase distributor are arranged at the bottom of the reactor, the gas phase in the gas phase space of the reactor and non-condensed gas which is not condensed at the reaction top can be forcibly recycled through the structures, and meanwhile the mixing effect of tower bottoms is enhanced. In order to prevent material blockage, an anti-blocking spray head is adopted on the gas phase distributor, and a flushing liquid feeding hole is formed in front of a material feeding pipeline of the circulating heat exchanger. And when blockage exists, the flushing fluid feeding pipeline can be opened for flushing, so that the blockage problem is effectively solved. Through the improvement, the reaction efficiency and the reliability of the system are remarkably improved.

The invention relates to the technical field of solid waste resource utilization, in particular to a waste wind power blade high-temperature plasma recovery system and device based on AI closed-loop control, and the system comprises a raw material pretreatment module which is used for receiving waste wind power blades and carrying out crushing and drying treatment on the waste wind power blades to obtain pretreated materials; the high-temperature plasma cracking module is connected with the raw material pretreatment module and is used for receiving the pretreated material and cracking the pretreated material into combustible gas and solid residues; comprising a high-temperature plasma reaction chamber, a plasma generating device, a feeding device, a reaction chamber monitoring sensor group and an AI control unit, the gas-solid separation and condensation module is connected with an outlet of the high-temperature plasma cracking module, receives the combustible gas and the solid residues, performs gas-solid separation on the combustible gas and the solid residues, and condenses and recovers the combustible gas; and the tail gas purification module is connected with a gas outlet of the gas-solid separation and condensation module.

The invention relates to the technical field of recycling and utilizing chemical production waste, in particular to a phenol tar graded purification device, which comprises a reactor and an auxiliary platform, wherein a stirring and mixing component is provided on the top of the reactor, and a condensation reflux component is provided on the side end of the stirring and mixing component on the top of the reactor. The condensation reflux components are provided in plurality, and the tops of the plurality of condensation reflux components are connected to a tail gas pipe. By arranging a first condensation unit and a second condensation unit, phenol vapor in waste gas generated during chemical purification in the reactor during the purification process of phenol tar is recovered, the first condensation unit is used for condensation recovery of phenol vapor in a regular manner, and the second condensation unit is used for emergency standby phenol vapor recovery, and the first condensation unit and the second condensation unit cooperate to clean scale and discharge scaled residual phenol liquid, so as to improve the recovery rate of phenol vapor in tail gas.