66 results about "CO2 content" patented technology

The invention discloses a preparation method of a biomass-based activated carbon desulfurizer. The method comprises the following steps: 1, crushing, cleaning and drying a biomass raw material to obtain a pretreated material; 2, pre-carbonizing and carbonizing to obtain charcoal particles; 3, introducing water vapor to activate the biochar particles to prepare activated carbon particles; 4, mixing and kneading the activated carbon particles and an additive, extruding into strips, and drying to obtain an activated carbon carrier; 5, dipping the activated carbon carrier with alkali to obtain a desulfurizer; the desulfurizer is applied to removal of sulfides in industrial feed gas. According to the desulfurizer, the biomass raw material serves as a carbon source, sufficient adsorption sites and alkaline catalysis sites are provided through water vapor activation pore forming and impregnation loading of alkali components, the desulfurization performance of the biomass-based activated carbon desulfurizer is improved, and the desulfurizer is suitable for deep desulfurization of industrial gas with high CO2 content and containing organic sulfur and inorganic sulfur; the raw materials are renewable, the desulfurization performance is excellent, the application range is wide, the precision is high, and the preparation process is green and environment-friendly.

The utility model discloses a carbon emission monitoring device for a thermal power plant, which comprises a collection pipe, a first end of which is used for being inserted into a flue to be detected; the heating assembly is arranged on the periphery of the second end of the collecting pipe; the filter is arranged in the collecting tube; and the gas analysis unit is connected with the second end of the collecting pipe and can detect the CO2 concentration of the gas collected by the collecting pipe. According to the utility model, the CO2 content in the gas can be detected in a severe environment.

The utility model discloses a screw cap tinplate canned beer CO2 content detection fixing tool which comprises a U-shaped support, a positioning sleeve barrel is fixedly connected to the inner wall of the U-shaped support, a fixing sleeve is fixedly connected to the bottom end of the inner wall of the positioning sleeve barrel, a wine tank is inserted into the positioning sleeve barrel, a tank cover is arranged at the bottom end of the wine tank, and a screw cap is arranged at the bottom end of the tank cover. According to the fixing tool for detecting the CO2 content of the tinplate canned beer with the screw cover, a tested tinplate canned beer sample can be fixed by the fixing tool, so that a carbon dioxide tester can be conveniently punctured from the bottom of the tinplate canned beer by a laboratory technician, and the CO2 content of the tinplate canned beer can be accurately detected. Not only is the operation of a laboratory technician standardized, but also the accuracy and the consistency of detection data are guaranteed.

The invention provides a fluid identification method and device, terminal equipment and a machine readable storage medium, and belongs to the field of oil exploration, and the identification method comprises the steps: determining a research sample well logging curve, a research sample gas logging curve and well drilling detection parameters; establishing a shallow resistivity and deep resistivity cross plot based on a research sample logging curve, and identifying water from unknown fluid; establishing a derivative parameter cross plot by using the research sample gas logging curve; establishing a density porosity and neutron porosity semi-quantitative evaluation CO2 content chart and a density porosity and porosity difference semi-quantitative evaluation CO2 content chart by utilizing a research sample well logging curve and well drilling detection parameters; and identifying CO2, condensate gas and oil in the unknown fluid based on the derived parameter cross plot, the CO2 content chart of the density porosity and neutron porosity semi-quantitative evaluation and the CO2 content chart of the density porosity and porosity difference semi-quantitative evaluation. Through the method provided by the invention, the unknown fluid can be accurately identified, and the well logging interpretation evaluation precision is improved.

The application provides a method for preparing hydrogen-rich low-carbon synthesis gas through high-water-content biogas residue chemical looping gasification, and belongs to the technical field of solid waste treatment. The method comprises the following steps: mixing high-water-content biogas residue with an oxygen carrier, and performing a chemical looping gasification reaction to obtain hydrogen-rich low-carbon synthesis gas; the water content of the high-water-content biogas residue is 30-50%; and the oxygen carrier is a transition metal loaded lanthanum oxide. The method uses a metal composite water-carbon oxygen capture oxygen carrier material, i.e., a transition metal loaded lanthanum oxide, to perform chemical looping gasification conversion on high-water-content biogas residue, thereby improving the water content tolerance of biogas residue chemical looping gasification, optimizing the quality of synthesis gas, increasing the hydrogen content in the synthesis gas, and reducing the CO2 content.

The application discloses a method for extracting helium from low-helium-containing natural gas and co-producing ethane, relates to the technical field of helium extraction from natural gas, and specifically relates to a method for extracting helium from low-helium-containing natural gas and co-producing ethane, which comprises the following steps: raw gas decarburization: CO2 in pressurized raw gas is absorbed by activated MDEA solution, and the CO2 content is removed to below 50 ppm; raw gas dehydration and mercury removal: dehydration and mercury removal are performed by using a three-tower isobaric molecular sieve dehydration and mercury removal process, and a purified gas with a water content of less than or equal to 1 ppm and a mercury content of less than 0.01 mu g / m3 is obtained; natural gas helium extraction. The application adopts three external mixed refrigerant refrigeration cycle systems such as a mixed refrigerant precooling process without expansion refrigeration, the system has rich regulation means, can provide matched cold energy for a crude helium extraction process, is flexible in operation, and is good in adaptability to raw materials; the natural gas helium extraction is simultaneously used for co-producing ethane and other light hydrocarbon products, and the energy consumption of a demethanizer gradient multi-stream side line extraction process device is greatly reduced.

The present application relates to the field of natural gas decarburization, and discloses a decarburization solvent, a decarburization method and system of carbon-containing natural gas, the decarburization solvent comprising a main agent, an activator and an auxiliary agent; wherein the main agent is N-methyldiethanolamine, the activator comprises a primary amine and a secondary amine, and the auxiliary agent is selected from at least one of potassium sorbate, sodium sorbate and sodium sulfite.The decarburization solvent and the decarburization method provided by the present application can not only make the absorption and regeneration equipment flexible to follow the change of the CO2 content of the raw gas in the natural gas development process and expand, but also avoid the corrosion and foaming of the tower equipment in the conventional process; meanwhile, the absorption and regeneration performance of the decarburization solution can be improved under the condition of meeting the purification index, and the regeneration heat consumption and the power consumption for pressurization of the amine liquid circulation can be greatly reduced.

The invention relates to a fresh-keeping container (1) for food products, in particular in the form of a vacuum drawer device, comprising at least one container base body (2) and a container lid (3) which can be placed on the at least one container base body (2), the container lid (3) comprising an open-loop and / or closed-loop control device (4) and at least one sensor device (5), wherein the at least one sensor device (5) is designed to determine a CO2 content, a temperature and / or a portion of an organic compound, in particular a volatile organic compound, of an atmosphere (6) arranged in the at least one container base body (2), the at least one open-loop and / or closed-loop control device (4) is designed to adjust the CO2 content, the temperature and / or the proportion of organic compounds of the atmosphere (6).

This invention provides an enclosure experimental device and method for measuring carbon sequestration in shellfish and algae, comprising: a stabilizing component, an enclosure component, a collection component, and a collection device; the stabilizing component is fixed on a marine aquaculture area, and multiple enclosure components are arranged inside the stabilizing component, each enclosure component containing a collection component for collecting shed material from aquaculture organisms; the collection device is mounted on the stabilizing component, with its lower end positioned above the collection component, and its upper end connected to a monitoring instrument via an air tube, the monitoring instrument being configured to measure the CO2 content of the air above the collection device. This invention can simulate a real marine aquaculture environment, enabling better collection of biological shed material and gas data, and improving the accuracy and scientific rigor of carbon sequestration measurement.

The invention discloses a process and a device for preparing LNG (Liquefied Natural Gas) and co-producing carbon dioxide from coke oven gas, belonging to the field of chemical industry. The coke oven gas subjected to fine desulfurization is divided into two paths, the first path directly enters a methanation section, the second path enters a CO conversion tower, CO is converted into CO2 through a water gas conversion reaction, and H2 is generated at the same time; the converted gas is cooled by a heat exchanger I2 or a steam boiler and then enters an alcohol amine decarburization tower, CO2 is partially or almost completely removed by spraying an alcohol amine solution, and the alcohol amine solution is heated and regenerated to obtain high-purity CO2 as a chemical raw material; the decarburized gas and the first path of gas are converged and then enter a methanation section, and H2 reacts with CO and CO2 in three methanation reactors which are connected in series and in parallel to generate CH4. The device comprises a main pipeline, a CO conversion tower, a heat exchanger, an alcohol amine decarbonization tower, an alcohol amine regeneration tower, a methanation reactor and the like. According to the invention, large-air-volume circulation and a compressor are avoided, the cost is saved, high-purity CO2 is co-produced, the CO / CO2 content and temperature rise can be flexibly regulated and controlled, and temperature runaway is prevented.

The utility model provides a phosphorous acid total organic carbon detection device, which relates to the technical field of total organic carbon detection devices, and comprises a pretreatment component, an acidification bin and a dilution bin communicated with the lower part of the acidification bin, a first one-way valve and a second one-way valve are fixedly arranged at the bottoms of the acidification bin and the dilution bin respectively, and an acid storage tank and a pure water tank which can be controlled to be opened and closed are communicated with one sides of the acidification bin and the dilution bin respectively; a combustion pipe communicated with the bottom of the dilution bin is contained in the high-temperature oxidation assembly, a cracking furnace is fixedly arranged outside the combustion pipe in a surrounding mode, and an oxygen inlet pipe is arranged on the side wall of the cracking furnace in a communicated mode; the condenser and the dryer are communicated with the outlet end of the combustion pipe; the detection assembly comprises a detection bin communicated with the outlet end of the dryer, a high-sensitivity sensor for detecting the CO2 content and converting the CO2 content into an electric signal is arranged in the detection bin, and one side of the high-sensitivity sensor is electrically connected with a processor for processing the electric signal and outputting a detection result.

The invention discloses a direct reinjection device for CO2 flooding produced gas, which is characterized in that an electric block valve, an electromagnetic heater, a gas-liquid separator, a molecular sieve dehydration pry, supercritical compression equipment and a reinjection unit are sequentially arranged along a flow node of the CO2 flooding produced gas, and an outlet of the reinjection unit is connected into a specified well; one bottom outlet of the gas-liquid separator is connected into the gathering and transporting system, the other bottom outlet of the gas-liquid separator is connected into the closed sewage tank, and the bottom outlets of the molecular sieve dehydration pry are connected into the closed sewage tank. The invention further discloses a direct reinjection method for CO2 flooding produced gas. The invention belongs to the technical field of carbon capture, burying and utilization, and solves the problems in the prior art that in the CO2 flooding extraction process, CO2 flooding extraction gas is high in CO2 content, the pressure in the open flow stage is high, and the extraction gas is difficult to enter a gas collection system. And the problems that in the prior art, CO2 drive produced gas is large in flow, high in CO2 content, large in fluctuation range and high in treatment cost are solved.

The application discloses a limestone fluidization calcination method and fluidization calcination furnace based on carbon stepwise circulation, wherein hot air with high temperature and high CO2 content after high-temperature decomposition of limestone is selectively returned to the atmosphere of different stages of initial decomposition of limestone in a stepwise circulation mode, so that the content of effective calcium oxide in the product is increased while the limestone pyrolysis efficiency is improved, the concentration of CO2 in the exhaust gas is increased, and the heat of the initial pyrolysis is assisted, which creates favorable conditions for the capture and recovery of CO2, significantly reduces carbon emission and energy consumption, and the method and system have the advantages of short process, easy control, low investment cost, significant economic benefits and the like, and provide a new way for resource utilization of waste fine limestone.

This invention discloses a method of capturing CO2 from air (or other gases containing less than 5%v CO2) by contacting it with porous solid pieces of Ca(OH)2 (i.e. solid particles of 1-50 mm equivalent diameter or solid packings such as Raschig rings with 2-10 mm wall thickness), arranged in at least one packed bed inside an air contactor so that the cross-section of the packed bed(s) occupies an entire cross-section of the air contactor. The method involves design tools to select the correct dimensions of the solids, the packed bed and the air contactor so that when the air contactor inlet is exposed to local winds, or blown by fans at 0.2-2.5 m / s, the pressure drop of the air through the packed bed is below a certain target between 10-500 Pa, with the lowest pressure range allowing passive carbonation of the solids without the need of fans.

The invention discloses a South China Sea carbon-rich natural gas decarburization process and device for methanation, and belongs to the technical field of new energy consumption and natural gas chemical industry. The decarburization device comprises an absorption system, a condensation liquefaction system, a flash evaporation system, a thermal regeneration system and a water washing system. By means of high integration of natural gas condensation and liquefaction, decarburization load distribution, throttling refrigeration and the like and process parameter optimization, the good energy-saving purpose can be achieved, good economical efficiency and reliability are achieved, the process is environmentally friendly, and the method is suitable for treating natural gas resources with high CO2 content in the South China Sea.

The present invention relates to a process for separating CO2 from natural gas by using a membrane having a greater selectivity for methane than for CO2. The reverse membrane produces a permeate having a low CO2 content that will be used as a fuel gas, thus reducing the energy demand of the CO2 reinjection system, since a stream having a high CO2 content will be maintained at high pressure.

This utility model discloses a fluidized bed gasification system, which includes a fluidized bed gasifier and a cooling device, a first dust removal device, and a cooling and scrubbing device connected in series at the syngas outlet of the fluidized bed gasifier. The cooling device is used to cool the syngas flowing out of the syngas outlet of the fluidized bed gasifier. The first dust removal device is used to collect fly ash from the syngas flowing out of the cooling device. The cooling and scrubbing device is used to wash the fly ash from the syngas flowing out of the first dust removal device. Based on the fluidized bed gasification system of this utility model, the resulting net syngas has a high CO content, low H2 and CO2 content, small wastewater and circulating water volume, low syngas dew point, and low heat loss from the gasifier.

Provided are a fluid identification method and system, a terminal device, and a machine-readable storage medium, belonging to the field of petroleum exploration. The method comprises: determining a study sample logging curve, a gas logging curve and drilling detection parameters; on the basis of the study sample logging curve, establishing a shallow resistivity and deep resistivity cross plot, and identifying water from among unknown fluids; using the gas logging curve to establish a derived parameter cross plot; using the study sample logging curve and the drilling detection parameters to establish a semi-quantitative evaluation chart of CO2 content based on density porosity and neutron porosity, and a semi-quantitative evaluation chart of CO2 content based on density porosity and porosity difference; on the basis of the derived parameter cross plot, the semi-quantitative evaluation chart of CO2 content based on density porosity and neutron porosity, and the semi-quantitative evaluation chart of CO2 content based on density porosity and porosity difference, identifying CO2, condensate gas and oil in the unknown fluids. By means of the provided method, unknown fluids can be accurately identified, and logging interpretation evaluation accuracy is improved.

The invention discloses a wellhead carbon dioxide trapping system and method. The wellhead carbon dioxide trapping system comprises a feed gas buffer tank, a filter, a heater and a gas membrane separator which are connected in sequence, the low-pressure output end of the gas membrane separator is connected with the input end of a CO2 storage tank, and the high-pressure output end of the gas membrane separator is connected with a product gas surface pipeline. The method comprises the following steps: carrying out primary gas-liquid separation on coal bed gas raw material gas with high CO2 content through a raw material gas buffer tank, then feeding the gas into a filter for fine separation, filtering to remove liquid drops and solid particles carried in the gas, and ensuring that the residual oil / liquid content is smaller than a set value; the coal bed gas treated by the filter enters a heater, is heated and then enters a gas membrane separator for separation; coalbed gas rich in CO2 enters a gas membrane separator, high-pressure product gas separated by a gas membrane enters a downstream surface pipeline, and low-pressure permeated gas separated by the gas membrane enters a CO2 storage tank. And the CO2 capture rate is ensured, the ground corrosion protection investment is reduced, and repeated utilization in different well sites is realized.

The invention relates to a method for the low-temperature separation of a feed gas containing CO2, at least one component lighter than CO2 and at least one component heavier than CO2, wherein, in order to produce a CO2-rich fluid, the feed gas is compressed, the compressed gas being cooled in a first heat exchanger, the gas cooled in the first heat exchanger is separated at low temperature in a first distillation column to produce a liquid that is enriched in CO2 and depleted in the at least one component lighter than CO2 and a gas that is depleted in CO2 and enriched in the at least one component lighter than CO2, the gas depleted in CO2 is heated in the first heat exchanger, a first part of the liquid enriched in CO2 is expanded and sent to a second distillation column in liquid form, a second part of the liquid enriched in CO2 is vaporized in the first heat exchanger then sent in gas form into the tank of the second distillation column, a liquid depleted in CO2 and enriched in the at least one heavier component is withdrawn from the second column, and a gas enriched in CO2 and depleted in the at least one heavier component is withdrawn at the top of the second column as product.

The invention relates to the technical field of carbon dioxide immobilization, and discloses a bipolar membrane electrodialysis and selective electrodialysis combined carbon immobilization method which comprises the following steps: S1, wastewater is intensively subjected to precipitation aeration to obtain reverse osmosis concentrated water, and S2, the reverse osmosis concentrated water is introduced into selective electrodialysis to be subjected to a selective permeable membrane treatment process to obtain reverse osmosis concentrated water. S5, a gas chamber is arranged on one side of the alkali chamber, gas with the CO2 content being 8%-15% is introduced, carbon monoxide is catalytically converted into carbon dioxide through a catalyst film, and the carbon dioxide is absorbed through the alkali chamber; and calcium and magnesium ions are isolated by adopting selective electrodialysis, so that subsequent scaling is avoided. The concentration of CO2 is further reduced to 8%-15% through secondary treatment of original gas and a selective electrodialysis isolator, the surface scaling characteristic after bipolar membrane treatment is optimized, the service life of the membrane is prolonged, the economic value is improved, and a new idea of low-concentration carbon dioxide treatment is broken through.

The invention provides a method for analyzing residual amounts of CH4 and CO2 in a coal sample, which comprises the following steps: (1) under normal pressure, placing the coal sample in a coal sample tank for natural analysis, collecting and analyzing the gas analysis amount Q normal pressure natural in the natural analysis process; (2) after natural analysis, starting a crushing mechanism in the coal sample tank for crushing until the particle size of 60% or more of the coal sample is 0.30 mm or less, collecting and analyzing the gas analysis amount Q in the crushing process, and naturally crushing; (3) analyzing the crushed coal sample particles under a negative pressure condition, and collecting and analyzing the gas analysis quantity Q negative pressure under the negative pressure condition; and (4) calculating to obtain the accumulated analysis quantity Q accumulation of the coal sample, wherein Q accumulation is equal to Q normal pressure natural + Q crushing natural + Q negative pressure. According to the analysis method, analysis gas released in coal natural analysis, crushing analysis and negative pressure analysis of the coal sample in after-mine activity is covered, and the residual amount of CH4 / CO2 in the coal sample can be measured more accurately.

A direct air capture (DAC) process for capturing CO2 from a stream of air by passing air through a capture unit comprising a sorbent structure The sorbent structure comprises an active component comprising sodium aluminate in an amount from 5 wt% and up to 40 wt% and a metal-containing support in an amount of at least 55 wt%, both based on the weight of the sorbent structure. The metal-containing support is selected from the group consisting of a metal alloy, metal oxide, metal-non-metal alloy, a ceramic material, and any combination thereof. The method further comprises capturing the carbon dioxide by the sorbent to provide a treated stream of air with less carbon dioxide exiting the capture unit.

The utility model belongs to Hismelt ironmaking technical field, concretely relates to a kind of Hismelt ironmaking coal gas pipeline. Coal gas pipeline includes the lead-out pipe connected with reduction furnace, riser, downcomer and diffusion valve, the downcomer is connected with gravity dust collector;At least one branch of coal powder spray gun is equipped on the coal gas pipeline, the coal powder spray gun is inserted into pipeline by passing through coal gas pipeline wall, and is connected with coal gas pipeline by flange;The cooling water pipe is arranged in the form of membrane wall in the inner wall of the coal gas pipeline;The diffusion valve is arranged at the connecting place of riser and downcomer, for balancing the pressure in coal gas pipeline, prevent pressure from suddenly rising.The realized effect is: CO2 content in coal gas reduces 3.7%, CO content increases 5.1%, and the calorific value of coal gas increases 26%;Increase the outlet angle of coal gas pipeline lead-out pipe, it is favorable for slag iron in coal gas pipeline to flow back into SRV, solve the problem of lead-out pipe accumulated slag iron.

The invention discloses a CO2-rich natural gas electro-thermal catalytic coupling reforming method. Methane and excessive carbon dioxide (CO2 / CH4gt; the mixed gas obtained in the step (1) is introduced into a cathode of a solid oxide electrolytic tank, and series coupling of three reactions of methane dry reforming, reverse water vapor shift and water electrolysis on the cathode side can be realized by applying external current, so that high CH4 conversion rate, high CO2 conversion rate and high H2 selectivity are obtained. According to the method, the natural gas with high CO2 content is completely converted into the synthesis gas in one step in a single reactor, a high-energy-consumption separation process is avoided, the problems of low CO2 utilization rate, low H2 selectivity, complex process, greenhouse gas emission and the like of a traditional carbon-rich natural gas conversion technology are solved, and the method has the advantages of high efficiency, economy, environmental protection and the like and is suitable for industrial production. The method has a wide application prospect in the fields of conversion and utilization of natural gas and storage of renewable electric energy.

The invention belongs to the technical field of oil and gas field development, and discloses a method for determining the lower limit of the CO2 content in CO2 flooding development reinjection gas, which comprises the following steps: S1, investigating the CO2 content range in the block output gas; s2, designing gas reinjection schemes with different CO2 contents; s3, through a crude oil component model / indoor test, MMP after the reinjection gas with different CO2 contents is in contact with the in-situ crude oil is obtained; s4, drawing an intersection by taking the CO2 content as an x axis and MMP as a y axis; and S5, analyzing to obtain the lower limit of the CO2 content when the reinjection gas is in contact with the in-situ crude oil to achieve a mixed phase. According to the method, the process of judging whether the produced gas containing CO2 can be used as the reinjection gas or not is systematically elaborated on the basis of actual data of the mine field in a numerical simulation or indoor experiment development mode, the judgment hysteresis in the mine field practice process is eliminated, the problem that CO2 is used as a newly-developing large thermal oil displacement medium but is insufficient in experience is solved to a certain extent, and the method is suitable for popularization and application. And a new thought is provided for treating CO2-containing output gas in a subsequent mine field.

The present disclosure is directed to metal ion-containing zeolitic compositions having MOR topology that are useful for scavenging CO2 from Iow-CO2-content feed, streams, including air, and method of making and using the same.

The invention relates to an oxygen-enriched combustion method and device. Circulating flue gas and to-be-converted flue gas are led out from furnace top flue gas; when the CO2 content in the to-be-converted flue gas is not lower than a specified threshold value, the to-be-converted flue gas is used as CO2-rich gas to be fed into a CO2 electrochemical catalytic conversion unit; and when the CO2 content in the to-be-converted flue gas is lower than the specified threshold value, leading out to-be-captured flue gas from the to-be-converted flue gas. The device comprises an industrial furnace, a CO2 trapping unit, a CO2 electrochemical catalytic conversion unit and a gas-gas mixer. By means of the oxygen-enriched combustion method and device, the operation mode and the smoke flow direction of the device can be flexibly set, and the problems that in the prior art, nitrogen oxide is continuously generated through single air combustion supporting, smoke exhaust heat loss is large, the concentration of CO2 in combustion products is low, trapping and utilization are not facilitated, the combustion supporting mode is single, and the combustion efficiency is low are solved. And a matched CO2 treatment facility is lacked.

The application discloses a correction method for monitoring results of flue gas emission pollutants in a heating furnace under an oxygen-enriched combustion state, and belongs to the technical field of flue gas pollutant monitoring. The application takes CO2 in flue gas as a reference object, and obtains a corresponding compensation correction coefficient by comparing the difference between a theoretical calculation value of CO2 content in flue gas under air combustion with an oxygen content of 21% and a measured value of CO2 in flue gas under an oxygen-enriched combustion state, so as to realize correction of the monitoring results of flue gas pollutants under the oxygen-enriched combustion state on the monitoring results of flue gas pollutants under corresponding air combustion. The application can effectively realize correction of the monitoring results of flue gas pollutants under the oxygen-enriched combustion state on the monitoring results of flue gas pollutants under corresponding air combustion, and is helpful to popularization and application of energy-saving and carbon-reducing technologies such as oxygen-enriched combustion.

The invention relates to the technical field of salt manufacturing brine purification, in particular to a calcium type brine coupling synthesis ammonia low-A tail gas purification process which comprises the following steps: pumping raw brine from a mine and mother liquor returned by a salt manufacturing workshop into a primary reaction clarification tank, adding sodium sulfate and a calcium hydroxide solution for reaction, and precipitating Mg < 2 + > and part of Ca < 2 + > in the brine; and pumping the clear liquid into a secondary reaction clarification tank, introducing CO2 tail gas generated by a synthetic ammonia low-temperature methanol washing process to perform carbonization reaction, controlling the reaction endpoint, supplementing sodium carbonate to completely precipitate Ca < 2 + > into calcium carbonate, and clarifying to obtain refined brine. Ammonia synthesis low-temperature methanol washing CO2 tail gas is adopted to replace flue gas of a power plant boiler, and CO2 is provided for salt manufacturing brine purification; and the synthesized low-methane tail gas is relatively high in CO2 content and relatively pure in component, so that the effects of reducing the brine purification cost and recycling CO2 are achieved, and the influence of dust, escaping ammonia, heavy metal ions and the like contained in the flue gas of the power plant boiler on the quality of a salt-making finished product can be avoided.