Carbon dioxide purification device with multi-stage impurity filtering and purifying function

Abstract

The utility model provides a carbon dioxide purification device with a multi-stage impurity filtering and purifying function. The carbon dioxide purification device comprises a rectifying tower, a buffer tank and a waste recovery assembly, a gas outlet end of the rectifying tower is connected with a gas inlet end pipeline of the buffer tank; a gas outlet end of the buffer tank is connected with an external finished gas storage tank pipeline; corrugated packing layers and flow guide units are alternately arranged in the rectifying tower in the tower height direction, and an annular spraying pipe is arranged at the top in the rectifying tower; a first filtering tank, a second filtering tank and a third filtering tank are sequentially arranged at the gas inlet end of the rectifying tower; the waste recovery assembly comprises a waste collection tank, an extraction tank and a regulating liquid delivery pump; an inlet of the waste collecting tank is respectively communicated with waste outlets of the first filtering tank, the second filtering tank and the third filtering tank; a feeding hole of the extraction tank is communicated with an outlet of the waste collecting tank, an inlet of the adjusting liquid conveying pump is communicated with an extraction liquid outlet of the extraction tank, and an outlet of the adjusting liquid conveying pump is communicated with the annular spraying pipe.

Description

TECHNICAL FIELD

[0001] The utility model belongs to purification device technical field, more specifically, it is especially related to a kind of carbon dioxide purification device with multistage filtration purification impurity. BACKGROUND

[0002] In carbonated beverage production, fresh gas packaging and other food processing scenarios, the impurities such as sulfides, moisture and microbial spores contained in raw material carbon dioxide often cause beverage odor, and moisture causes condensation inside the package to breed bacteria;At this time, carbon dioxide purification device needs to be used to achieve deep removal of trace impurities in raw gas, so as to produce food-grade carbon dioxide meeting standards.

[0003] However, the waste treatment system of the traditional purification device is completely separated from the main purification process, and it does not have the function of converting acidic / alkaline components in waste into rectification adjustment medium, resulting in direct discharge of waste in continuous production process, not only the reusable adsorbent resources are lost, but also the acidic substances remaining in the waste filter material will seep into the soil under the rainwater washing, causing the pH value of the surrounding water to decrease. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the utility model provides a kind of carbon dioxide purification device with multistage filtration purification impurity to solve the technical problems of environmental pollution caused by the complete separation of waste treatment system of traditional purification device from main purification process in prior art.

[0005] The purpose and effect of the carbon dioxide purification device with multistage filtration purification impurity of the utility model are achieved by the following specific technical means:

[0006] A kind of carbon dioxide purification device with multistage filtration purification impurity, including rectifying column and buffer tank and waste recovery component;The gas outlet end of the rectifying column is connected with the gas inlet end of the buffer tank by pipeline, and the gas outlet end of the buffer tank is connected with the external finished gas storage tank by pipeline;The rectifying column is alternately provided with corrugated packing layer and flow guide unit along the direction of tower height, and the top of the rectifying column is provided with annular spray pipe;Corrugated packing layer includes corrugated plate and shell, and the shell and corrugated plate are filled with molecular sieve particles;Flow guide unit includes center flow guide cylinder and adsorption cylinder arranged around the center flow guide cylinder;The gas inlet end of the rectifying column is provided with first filter tank, second filter tank and third filter tank in sequence;The waste recovery component includes waste collection tank, extraction tank and adjusting liquid delivery pump;The inlet of the waste collection tank is communicated with the waste discharge outlet of the first filter tank, the second filter tank and the third filter tank respectively;The feed inlet of the extraction tank is communicated with the outlet of the waste collection tank, the inlet of the adjusting liquid delivery pump is communicated with the extraction liquid outlet of the extraction tank, and the outlet of the adjusting liquid delivery pump is communicated with the annular spray pipe.

[0007] According to a preferred embodiment, the corrugated plate is a multi-layer structure, each layer of the corrugated plate is provided with mass transfer micro-holes, and the mass transfer micro-holes are arranged in a diamond array; the molecular sieve particles are filled between two adjacent layers in the corrugated plate.

[0008] According to a preferred embodiment, the center flow guide cylinder side wall is provided with a flow guide hole; the adsorption cylinder is provided with a gas permeable hole; the center flow guide cylinder opening end is located at the top; the adsorption cylinder opening end is located at the bottom, and the center flow guide cylinder opening end is in communication with the adsorption cylinder opening end through the flow guide hole and the gas permeable hole in sequence.

[0009] According to a preferred embodiment, the annular spray pipe is provided with a spray head; a pipeline between the regulating liquid delivery pump outlet and the annular spray pipe is provided with a pH sensor and an electromagnetic flow regulating valve, the pH sensor detection end is located in the liquid phase area in the rectifying tower, and the pH sensor and the electromagnetic flow regulating valve are electrically connected.

[0010] According to a preferred embodiment, the extraction tank comprises an acid extraction cavity and an alkaline extraction cavity arranged in sequence along the gas flow direction; a partition plate is arranged between the acid extraction cavity and the alkaline extraction cavity, the partition plate is provided with a communication hole, and a one-way valve is arranged on the communication hole; the top of the extraction tank is provided with an extractant supply port.

[0011] According to a preferred embodiment, the pipeline between the regulating liquid delivery pump outlet and the annular spray pipe is wrapped with a heat tracing jacket, the heat tracing jacket is connected with the reboiler waste heat outlet pipeline of the rectifying tower, and a temperature sensor is arranged on the pipeline, and the temperature sensor and the heat tracing jacket are electrically connected.

[0012] According to a preferred embodiment, the first filter tank is provided with a composite filter layer, the second filter tank is provided with an activated carbon adsorption layer, and the third filter tank is provided with a microporous filter membrane.

[0013] Compared with the prior art, the utility model has the advantages of:

[0014] 1. The waste recovery assembly is arranged, so that the device can convert the waste generated by the filter tank into a rectifying regulating medium, solves the problem of waste and main process separation of the traditional device, and improves the environmental protection and resource utilization of the device. The device can collect the waste filter material and the analysis waste liquid of the first, second and third filter tanks through the waste collection tank, separate the acid / base components in the extraction tank, and then deliver the extraction liquid to the annular spray pipe at the top of the rectifying tower through the regulating liquid delivery pump. The device avoids soil and water pollution caused by direct waste discharge, and reuses the effective components in the waste, so that the device does not need to add additional regulating medium, and the resource recycling capacity of the device is improved.

[0015] 2. In use, the device can remove solid particles, sulfides, microbial spores and other impurities in the raw gas by the first, second and third filter tanks arranged in sequence, thereby improving the impurity targeted removal capacity of the device and meeting the purification demand of food-grade carbon dioxide. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structure schematic diagram of the assembled utility model;

[0017] Figure 2 is a front view of the utility model;

[0018] Figure 3 is a structure schematic diagram of the internal structure of the rectifying tower of the utility model;

[0019] Figure 4 is Figure 3 is an enlarged view of the a area in the figure;

[0020] Figure 5 is a structure schematic diagram of the internal structure of the waste recovery assembly of the utility model;

[0021] Figure 6 is a structure schematic diagram of the corrugated packing layer of the utility model;

[0022] Figure 7 is a structure schematic diagram of the flow guide unit of the utility model.

[0023] In the figure, the corresponding relationship between the component name and the figure number is as follows:

[0024] 11, rectifying tower; 12, annular spray pipe; 13, corrugated plate; 131, mass transfer micropore; 14, shell; 15, molecular sieve particle; 16, center flow guide cylinder; 161, flow guide hole; 17, adsorption cylinder; 171, air permeable hole; 18, pH sensor; 21, buffer tank; 31, waste collection tank; 32, extraction tank; 321, acidic extraction cavity; 322, alkaline extraction cavity; 323, partition; 324, one-way valve; 325, extractant supply port; 41, first filter tank; 42, second filter tank; 43, third filter tank; 51, electromagnetic flow regulating valve; 52, regulating liquid delivery pump; 53, temperature sensor; 54, heat tracing jacket. DETAILED DESCRIPTION

[0025] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solution of this utility model, but should not be used to limit the scope of protection of this utility model.

[0026] Example: For example Figures 1 to 7 As shown, this utility model provides a carbon dioxide purification device with multi-stage filtration to remove impurities, including a distillation column 11, a buffer tank 21, and a waste recovery assembly; the gas outlet of the distillation column 11 is connected to the gas inlet of the buffer tank 21, and the gas outlet of the buffer tank 21 is connected to an external finished gas storage tank; corrugated packing layers and flow guiding units are alternately arranged along the height of the distillation column 11, and an annular spray pipe 12 is provided at the top of the distillation column 11; the corrugated packing layer includes a corrugated plate 13 and a shell 14, and molecular sieve particles 15 are filled between the shell 14 and the corrugated plate 13; the flow guiding unit includes a central flow guiding cylinder 16 and a surrounding... The central guide tube 16 is equipped with an adsorption tube 17; the inlet end of the distillation column 11 is sequentially equipped with a first filter tank 41, a second filter tank 42, and a third filter tank 43; the waste recovery assembly includes a waste collection tank 31, an extraction tank 32, and a conditioning liquid transfer pump 52; the inlet of the waste collection tank 31 is connected to the waste outlets of the first filter tank 41, the second filter tank 42, and the third filter tank 43 respectively; the inlet of the extraction tank 32 is connected to the outlet of the waste collection tank 31; the inlet of the conditioning liquid transfer pump 52 is connected to the extract outlet of the extraction tank 32; and the outlet of the conditioning liquid transfer pump 52 is connected to the annular spray pipe 12.

[0027] Understandably, this device is used in the food processing field to perform multi-stage filtration and deep purification of carbon dioxide feed gas to produce food-grade carbon dioxide that meets standards, while realizing waste resource utilization and stable control of the distillation environment, taking into account both environmental protection and production economy.

[0028] Specifically, the device first pre-treats the raw material gas through a first filter tank 41, a second filter tank 42, and a third filter tank 43 arranged sequentially at the air inlet: the composite filter layer of the first filter tank 41 removes solid particles, the activated carbon adsorption layer of the second filter tank 42 removes sulfides and trace odor substances, and the microporous filter membrane of the third filter tank 43 removes microbial spores. This process can avoid impurities from affecting food quality and lay a pure raw material foundation for subsequent purification.

[0029] The pretreated raw gas enters the rectification tower 11, and the corrugated packing layer and the flow guide unit alternately arranged along the tower height direction in the tower cooperate: the molecular sieve particles 15 are filled between the outer shell 14 and the corrugated plate 13 of the corrugated packing layer, which cooperates with the mass transfer micropores 131 on the corrugated plate 13 to strengthen the impurity adsorption and gas-liquid mass transfer; the central flow guide cylinder 16 of the flow guide unit guides the uniform distribution of the gas flow, and the adsorption cylinder 17 arranged around the central flow guide cylinder 16 further captures the residual impurities. The separated carbon dioxide first enters the buffer tank 21 to stabilize the pressure, so as to avoid the liquid carried by the product gas due to pressure fluctuation and ensure the continuity of subsequent food processing, and then is transported to the external product gas storage tank for standby.

[0030] At the same time, the device realizes resource recycling and environmental protection control through the waste recovery assembly: the waste collection tank 31 collects the waste filter material and the resolved waste liquid generated by each filter tank, the extraction tank 32 processes the waste to separate the acidic / alkaline components, and the adjusting liquid delivery pump 52 sends the separated adjusting liquid to the annular spray pipe 12 at the top of the rectification tower 11.

[0031] This process not only avoids the environmental impact caused by direct discharge of waste, but also reduces the procurement cost of adjusting medium; and the annular spray pipe 12 can cooperate with related components to dynamically regulate the pH value of the liquid phase in the tower, prevent corrosion of the equipment caused by acidic environment, prolong the service life of the device, and ultimately realize the synergy of "purification-waste utilization-equipment protection", meeting the multiple demands of food processing on carbon dioxide purity, safety and production sustainability.

[0032] The corrugated plate 13 is a multi-layer structure, and the corrugated plate 13 is provided with mass transfer micropores 131 in each layer, and the mass transfer micropores 131 are arranged in a diamond array; the molecular sieve particles 15 are filled between adjacent two layers of the corrugated plate 13.

[0033] Specifically, the multi-layer structure can increase the gas-liquid contact area, the diamond array mass transfer micropores 131 opened in each layer can guide the gas flow and the liquid to flow along a specific path, avoiding local gas flow short circuit, and at the same time, the molecular sieve particles 15 are filled between adjacent two layers, which not only fixes the position of the molecular sieve to prevent it from deviating with the gas flow, but also enables the gas flow to fully pass through the gap between the molecular sieves, strengthens the adsorption of residual moisture and small molecular impurities in the raw gas, and further improves the purity of the pretreated raw gas.

[0034] The side wall of the central flow guide cylinder 16 is provided with a flow guide hole 161; the adsorption cylinder 17 is provided with a gas permeable hole 171; the opening end of the central flow guide cylinder 16 is located at the top; the opening end of the adsorption cylinder 17 is located at the bottom, and the opening end of the central flow guide cylinder 16 communicates with the opening end of the adsorption cylinder 17 through the flow guide hole 161 and the gas permeable hole 171 in sequence.

[0035] Specifically, the center draft tube 16 top opening receives the gas-liquid mixture flowing from the upper part of the rectification tower 11, the draft hole 161 of the side wall can uniformly distribute the mixture to the surrounding adsorption cylinder 17, the bottom opening of the adsorption cylinder 17 facilitates the downward flow of the processed gas stream, and the air-permeable hole 171 on the adsorption cylinder 17 can allow the gas stream to fully contact the adsorption material in the adsorption cylinder 17, realizing deep capture of residual odor substances and trace impurities, while avoiding uneven mass transfer caused by concentrated gas stream impacting the tower wall, improving the efficiency of rectification separation.

[0036] The annular spray pipe 12 is provided with a spray head; a pH sensor 18 and an electromagnetic flow regulating valve 51 are arranged on the pipeline between the annular spray pipe 12 and the regulating liquid delivery pump 52 outlet, and the detection end of the pH sensor 18 is located in the liquid phase area in the rectification tower 11, and the pH sensor 18 is electrically connected with the electromagnetic flow regulating valve 51.

[0037] Specifically, the spray head can uniformly spray the regulating liquid in the form of mist into the rectification tower 11, ensuring that the regulating liquid is fully mixed with the liquid phase in the tower; the pH sensor 18 monitors the pH value of the liquid phase in the tower in real time, and when the pH value deviates from the appropriate range, it will automatically send a signal to the electromagnetic flow regulating valve 51, dynamically correct the pH environment in the tower by adjusting the delivery amount of the regulating liquid, prevent impurities from being precipitated or equipment from being corroded due to pH imbalance, and ensure the stability of the rectification process.

[0038] For example, in the process of purifying carbon dioxide for carbonated beverages, the appropriate pH control range of the liquid phase in the rectification tower 11 is 6.5-7.5, which can avoid corrosion of the stainless steel corrugated packing in the tower in acidic environment, and prevent the molecular sieve from losing adsorption performance due to excessive alkalinity. When the content of acidic impurities such as H2S in the raw material gas increases suddenly, the pH sensor 18 detects that the pH of the liquid phase in the tower drops below 6.0, the sensor will immediately send an electrical signal to the electromagnetic flow regulating valve 51, triggering the valve to increase the opening degree; at this time, the flow of alkaline regulating liquid delivered by the regulating liquid delivery pump 52 increases, which is extracted from waste filter material by the waste recovery assembly, and after being atomized by the spray head on the annular spray pipe 12, it uniformly covers the liquid phase area in the tower and rapidly mixes with the acidic liquid phase. When the pH sensor 18 detects that the pH of the liquid phase rises to 6.8, it will send a signal again to make the electromagnetic flow regulating valve 51 reduce the opening degree and reduce the delivery amount of the regulating liquid, finally stabilizing the pH in the tower within the appropriate range, avoiding damage to the packing caused by acid corrosion, and preventing impurities from being precipitated and mixed into the product due to pH imbalance, ensuring that the output carbon dioxide meets the food-grade purity requirements.

[0039] The extraction tank 32 includes an acidic extraction cavity 321 and an alkaline extraction cavity 322 arranged in sequence along the gas flow direction; a partition plate 323 is arranged between the acidic extraction cavity 321 and the alkaline extraction cavity 322, the partition plate 323 is provided with a communication hole, and a one-way valve 324 is arranged on the communication hole; the top of the extraction tank 32 is provided with an extractant supply port 325.

[0040] Specifically, the waste first enters the acidic extraction cavity 321 to remove the basic impurities therein, and then enters the basic extraction cavity 322 through the communication hole on the partition 323 to separate the acidic components. The one-way valve 324 can prevent the extraction agents in the two cavities from mixing in reverse flow, ensuring the impurity separation effect. When the concentration of the extraction agent is reduced due to use, new extraction agent can be supplemented through the extraction agent supplement port 325 at the top to maintain the extraction efficiency, ensure the concentration stability of the conditioning liquid separated from the waste, and meet the pH adjustment requirements of the rectifying column 11.

[0041] It can be understood that the working principle of the extraction tank is based on "step-by-step targeted impurity removal, anti-mixed flow, and concentration stability". Through the orderly cooperation of the double-chamber and dynamic replenishment, the acidic / basic components that can be used for pH adjustment of the rectifying column 11 are separated from the waste in the filter tank. The specific process is as follows:

[0042] First, the mixed waste delivered by the waste collection tank 31 contains waste filter material debris, resolved waste liquid, and residual adsorption impurities. It first enters the acidic extraction cavity 321 of the extraction tank 32 through the feed pipe. The cavity is pre-filled with an acidic extraction agent, dilute sulfuric acid solution. The basic impurities in the waste, such as hydroxyl ions adsorbed by waste activated carbon, and the residual basic neutralizing agent in the resolved liquid, will undergo a neutralization reaction with the acidic extraction agent to generate salt substances that are easily soluble in the extraction agent, achieving directional removal of basic impurities. At the same time, the solid filter material debris, such as failed molecular sieve and activated carbon particles, in the waste will slowly settle at the bottom of the acidic extraction cavity 321 due to their higher density than the extraction agent, and will be collected for subsequent recycling and regeneration.

[0043] After the removal of basic impurities in the acidic extraction cavity 321 is completed, the waste liquid containing acidic impurities and the settled solid debris will flow to the communication hole on the partition 323 under the action of gravity. At this time, the one-way valve 324 on the communication hole only allows the waste liquid to flow from the acidic extraction cavity 321 to the basic extraction cavity 322 in one direction, completely blocking the reverse flow of the basic extraction agent, dilute sodium hydroxide solution, in the basic extraction cavity 322 to the acidic extraction cavity 321, avoiding direct neutralization of the acid-base extraction agents that can cause impurity removal failure. After entering the basic extraction cavity 322, the acidic impurities in the waste liquid, such as sulfide conversion acid and organic acid resolved by molecular sieve, will react with the basic extraction agent to form a stable salt solution, completing the deep removal of acidic impurities, and finally obtaining two types of products, "decontaminated solid filter material" and "extraction liquid containing specific acid-base components", where the extraction liquid is the conditioning liquid raw material required for pH adjustment of the rectifying column 11.

[0044] During the process, the extraction tank 32 top extraction agent supply port 325 will cooperate with the dynamic supply of the impurity removal process: when the acidic extraction chamber 321 causes the extraction agent concentration to decrease due to continuous neutralization reaction, the dilute sulfuric acid concentration decreases from 8% to 3%, or the alkaline extraction chamber 322's alkaline extraction agent concentration is insufficient, the dilute sodium hydroxide concentration decreases from 5% to 2%, new high concentration extraction agent is supplemented to the corresponding chamber through the supply port to maintain the extraction agent concentration stable in the efficient impurity removal interval acidic extraction agent concentration 5%-8%, alkaline extraction agent concentration 3%-5%, ensure that the pH of the alkaline adjusting solution is stable at 10-11 and the pH of the acidic adjusting solution is stable at 2-3, and then meet the pH dynamic adjustment requirements of the rectifying column 11 under different impurity loads, while maximizing the recovery and utilization of waste components.

[0045] The pipe outside wall between the regulating liquid delivery pump 52 outlet and the annular spray pipe 12 is wrapped with a heat tracing jacket 54, the heat tracing jacket 54 is connected with the reboiler waste heat outlet pipe of the rectifying column 11, and a temperature sensor 53 is arranged on the pipe, and the temperature sensor 53 is electrically connected with the heat tracing jacket 54.

[0046] Specifically, the heat tracing jacket 54 uses the waste heat generated by the reboiler of the rectifying column 11 to heat the regulating liquid in the pipe, avoiding crystallization or increased viscosity of the regulating liquid due to too low temperature, and ensuring smooth delivery; the temperature sensor 53 monitors the temperature of the regulating liquid in the pipe in real time, and when the temperature is lower than the set value, the heat tracing jacket 54 is automatically controlled to enhance the heating effect, and when the temperature is higher than the set value, the heating is weakened, which not only realizes waste heat recovery and energy saving, but also maintains the stability of the temperature of the regulating liquid, avoiding the influence of temperature fluctuation on the environment in the rectifying column 11.

[0047] For example, in the winter purification production of food-grade carbon dioxide, the workshop environment temperature is relatively low, about 5-8℃, and the regulating liquid contains trace amounts of salt components such as sodium sulfide and sodium sulfate extracted from waste, which are prone to crystallization when the temperature is lower than 15℃. If the crystallization adheres to the inner wall of the pipe, it will cause the regulating liquid delivery flow to decrease, or even block the pipe. At this time, the temperature sensor 53 on the pipe will monitor the temperature of the regulating liquid in real time, and when the temperature is detected to be lower than 14℃, the set lower limit is 15℃, an electrical signal will be sent to the heat tracing jacket 54 immediately; the heat tracing jacket 54 is connected with the reboiler waste heat outlet pipe of the rectifying column 11, and will automatically increase the waste heat input amount, using the 30-40℃ waste heat generated during the operation of the reboiler to heat the pipe, so that the temperature of the regulating liquid gradually rises to 18℃. When the temperature sensor 53 detects that the temperature of the regulating liquid is stable in the appropriate interval of 15-25℃, it will trigger the heat tracing jacket 54 to reduce the waste heat input amount, and maintain the temperature stable.

[0048] Conversely, if the workshop temperature is higher in summer, about 28-32℃, the reboiler waste heat output increases, which may cause the temperature of the regulating liquid to rise to 27℃, the set upper limit of which is 25℃. At this time, the temperature sensor 53 will again link the heat tracing sleeve 54 to reduce the waste heat input and avoid the temperature of the regulating liquid being too high. If the high-temperature regulating liquid directly enters the rectification tower 11, it will cause the local liquid phase temperature in the tower to rise, affecting the separation efficiency of carbon dioxide and impurities, and even causing the molecular sieve adsorption performance to decline. Through this dynamic regulation, the reboiler waste heat is utilized to achieve energy saving without additional consumption of electric energy for heating, and the crystallization of the regulating liquid due to temperature fluctuations is avoided, or the influence on the rectification environment is avoided, so that the regulating liquid is stably transported to the annular spray pipe 12, the pH adjustment requirement of the rectification tower 11 is met, and finally the purity of the food-grade carbon dioxide is stabilized.

[0049] The first filter tank 41 is provided with a composite filter layer, the second filter tank 42 is provided with an activated carbon adsorption layer, and the third filter tank 43 is provided with a microporous filter membrane.

[0050] Specifically, the composite filter layer of the first filter tank 41 can intercept solid particles in the raw material gas to prevent the particles from entering the subsequent links and blocking the equipment; the activated carbon adsorption layer of the second filter tank 42 can adsorb sulfides and trace odor substances to avoid the influence of such impurities on the flavor and safety of the food-grade carbon dioxide; and the microporous filter membrane of the third filter tank 43 can intercept microbial spores to meet the stringent requirements of food processing on the microbial indicators of carbon dioxide. The three-level filter layer has clear division of labor and realizes the graded purification of the raw material gas.

[0051] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above, and for those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned exemplary embodiments.

Claims

1. A carbon dioxide purification device with multi-stage filtration to remove impurities, characterized in that: Includes a distillation column (11), a buffer tank (21), and a waste recovery assembly; the outlet of the distillation column (11) is connected to the inlet of the buffer tank (21) via a pipeline, and the outlet of the buffer tank (21) is connected to an external finished gas storage tank via a pipeline; the distillation column (11) has corrugated packing layers and flow guiding units alternately arranged along the column height direction, and an annular spray pipe (12) is provided at the top of the distillation column (11); the corrugated packing layer includes a corrugated plate (13) and an outer shell (14), and molecular sieve particles (15) are filled between the outer shell (14) and the corrugated plate (13); the flow guiding unit includes a central flow guiding cylinder (16) and an adsorption cylinder (17) arranged around the central flow guiding cylinder (16); the distillation column ( 11) The air inlet end is provided with a first filter tank (41), a second filter tank (42), and a third filter tank (43) in sequence; the waste recycling assembly includes a waste collection tank (31), an extraction tank (32), and a conditioning liquid transfer pump (52); the inlet of the waste collection tank (31) is connected to the waste outlet of the first filter tank (41), the second filter tank (42), and the third filter tank (43), respectively; the inlet of the extraction tank (32) is connected to the outlet of the waste collection tank (31); the inlet of the conditioning liquid transfer pump (52) is connected to the extract outlet of the extraction tank (32); and the outlet of the conditioning liquid transfer pump (52) is connected to the annular spray pipe (12).

2. The carbon dioxide purification device with multi-stage filtration for impurity removal according to claim 1, characterized in that: The corrugated plate (13) has a multi-layer structure. Each layer of the corrugated plate (13) has mass transfer micropores (131) and the mass transfer micropores (131) are distributed in a rhomboid array. The molecular sieve particles (15) fill the space between adjacent layers in the corrugated plate (13).

3. The carbon dioxide purification device with multi-stage filtration to remove impurities according to claim 2, characterized in that: The central guide tube (16) has a guide hole (161) on its side wall; the adsorption tube (17) has a vent hole (171) on its surface; the opening end of the central guide tube (16) is located at the top; the opening end of the adsorption tube (17) is located at the bottom, and the opening end of the central guide tube (16) is connected to the opening end of the adsorption tube (17) in sequence through the guide hole (161) and the vent hole (171).

4. A carbon dioxide purification device with multi-stage filtration to remove impurities according to claim 3, characterized in that: The annular spray pipe (12) is equipped with a spray head; a pH sensor (18) and an electromagnetic flow regulating valve (51) are installed on the pipe between the annular spray pipe (12) and the outlet of the regulating liquid transfer pump (52). The detection end of the pH sensor (18) is located in the liquid phase region inside the distillation column (11), and the pH sensor (18) is electrically connected to the electromagnetic flow regulating valve (51).

5. A carbon dioxide purification device with multi-stage filtration to remove impurities according to claim 1, characterized in that: The extraction tank (32) includes an acidic extraction chamber (321) and an alkaline extraction chamber (322) arranged sequentially along the airflow direction; a partition (323) is provided between the acidic extraction chamber (321) and the alkaline extraction chamber (322), and a connecting hole is provided on the partition (323), and a one-way valve (324) is provided on the connecting hole; the top of the extraction tank (32) is provided with an extractant supply port (325).

6. A carbon dioxide purification device with multi-stage filtration to remove impurities according to claim 1, characterized in that: The outer wall of the pipe between the outlet of the regulating liquid transfer pump (52) and the annular spray pipe (12) is wrapped with a heat tracing jacket (54). The heat tracing jacket (54) is connected to the reboiler waste heat outlet pipe of the distillation column (11), and a temperature sensor (53) is provided on the pipe. The temperature sensor (53) is electrically connected to the heat tracing jacket (54).

7. A carbon dioxide purification device with multi-stage filtration to remove impurities according to claim 1, characterized in that: The first filter tank (41) is provided with a composite filter layer, the second filter tank (42) is provided with an activated carbon adsorption layer, and the third filter tank (43) is provided with a microporous filter membrane.

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