High concentration carbon dioxide recovery and refining device

Abstract

The present invention relates to the technical field of carbon dioxide refining, and in particular to a high-concentration carbon dioxide recovery and refining device, comprising: a compression unit for compressing a carbon dioxide mixed gas; a purification unit for desulfurizing, removing heavy component impurities and drying the carbon dioxide mixed gas; a liquefaction unit for cooling and liquefying the purified gas; a distillation unit for removing light component impurities from the liquefied purified gas through a reboiling process to obtain food-grade liquid carbon dioxide; and by monitoring the drying process, targeted adjustments are made to processes that do not meet the standards, thereby improving the recovery and refining efficiency of carbon dioxide.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide refining, and in particular to a high-concentration carbon dioxide recovery and refining device. Background Art

[0002] As a valuable carbon resource, carbon dioxide is widely used in many fields. For example, a large amount of carbon dioxide is needed in the chemical synthesis industry, gas shielded welding, metal casting and processing, tobacco puffing, agricultural fertilization, fruit and vegetable preservation, beer and beverage filling, oil extraction, fire fighting, and medical and health industries. With the continuous development of new technologies and the continuous expansion of application fields, the demand for carbon dioxide in industry is increasing.

[0003] On the other hand, the large-scale emission of carbon dioxide has a significant impact on the global climate and exacerbated the greenhouse effect. Therefore, controlling the emission of carbon dioxide and recovering, fixing, utilizing and recycling carbon dioxide emitted from industrial waste gas have become issues of great concern to countries around the world. Recycling and refining high-concentration carbon dioxide not only helps reduce greenhouse gas emissions, but also converts this resource into valuable industrial raw materials, thereby achieving a win-win situation in terms of economic and environmental benefits.

[0004] The development and application of high-concentration carbon dioxide recovery and refining devices are of great significance for improving the recovery rate and purity of carbon dioxide. Such devices usually include multiple units such as compression, adsorption, drying, refrigeration, purification, liquefaction and distillation, which can effectively separate and refine high-concentration carbon dioxide in waste gas. Through such devices, carbon dioxide originally discharged into the atmosphere can be converted into valuable industrial raw materials, thereby realizing the recycling of resources and sustainable development of the environment.

[0005] Chinese Patent Publication No.: CN105916568B discloses a carbon dioxide separation and recovery system, including an adsorption tower, a regeneration tower and a drying tower. In the adsorption tower, the target gas is brought into contact with the adsorption material so that the carbon dioxide in the target gas is adsorbed into the adsorption material. In the regeneration tower, the wet gas at normal pressure, which is a mixed gas of carbon dioxide and water vapor, is brought into contact with the adsorption material after the adsorption of carbon dioxide to release carbon dioxide from the adsorption material. In the drying tower, the adsorption material is dried. In addition, the carbon dioxide separation and recovery system includes a compressor for compressing carbon dioxide, and an exhauster for generating wet gas by expanding the carbon dioxide discharged from the compressor while sucking water vapor under negative pressure.

[0006] It can be seen that the carbon dioxide separation and recovery system has the following problems: the system recovers and refines carbon dioxide through an adsorption tower, a regeneration tower and a drying tower, but the system lacks monitoring of the recovery and refining process and cannot guarantee the effect of the final carbon dioxide obtained, resulting in low efficiency in the recovery and refining of carbon dioxide. Summary of the invention

[0007] To this end, the present invention provides a high-concentration carbon dioxide recovery and purification device to overcome the problem of low recovery and purification efficiency of carbon dioxide in the prior art.

[0008] To achieve the above object, the present invention provides a high-concentration carbon dioxide recovery and purification device, comprising:

[0009] A compression unit, used for compressing the carbon dioxide mixed gas to obtain a compressed mixed gas;

[0010] The purification unit is connected to the compression unit and includes a purification component, a data acquisition component, a heat transfer component and a control component, wherein:

[0011] The purification component includes a cooling water separator, a drying bed and an adsorption bed, the cooling water separator is used to cool the compressed mixed gas to separate the condensed water in the compressed mixed gas to obtain a dehydrated mixed gas, the drying bed is used to dry the dehydrated mixed gas to obtain a dry mixed gas, the adsorption bed is used to remove the sulfur-containing components of the dry mixed gas to obtain a desulfurized mixed gas, and remove heavy component impurities from the desulfurized mixed gas to obtain purified gas;

[0012] The data acquisition component includes a moisture content sensor disposed at the air outlet of the drying bed and a temperature sensor disposed inside the drying bed;

[0013] A heat transfer component, used to transfer the heat of the desulfurization process to the desiccant bed, comprising a heat exchange tank connected to the adsorption bed and having a temperature compensation component and a temperature reduction component, the heat exchange tank being connected to the desiccant bed through a heat transfer pipe, and an electric valve being arranged at one end of the heat transfer pipe close to the desiccant bed;

[0014] The regulating component is used to determine whether the drying environment meets the standard according to the drying temperature in the drying bed, and adjust the electric valve for the drying environment that does not meet the standard, and determine whether the drying process of the dehydrated mixed gas meets the standard according to the moisture content in the mixed gas in the drying bed, and adjust the mixing ratio of the adsorbent or the rotation speed of the adsorbent according to the moisture content difference for the drying process that does not meet the standard;

[0015] a liquefaction unit connected to the purification unit and used to cool and liquefy the purified gas to obtain liquefied purified gas;

[0016] The distillation unit is connected to the liquefaction unit and is used to remove light component impurities from the liquefied purified gas through a reboiling process to obtain food-grade liquid carbon dioxide.

[0017] Furthermore, the drying bed comprises an adsorption tower and a regeneration tower, wherein a plurality of rotatable disks for placing adsorbents are respectively arranged in parallel in the vertical direction inside the adsorption tower and the regeneration tower, wherein the rotation directions of any two adjacent disks are in opposite directions.

[0018] Furthermore, the adsorbent is a mixture of molecular sieve and alumina.

[0019] Further, the regulating component determines that the drying environment does not meet the standard based on a comparison result that the drying temperature is less than a first preset drying temperature or greater than a second preset drying temperature.

[0020] Further, the regulating component, under the condition that the drying temperature is greater than the second preset drying temperature, subtracts the drying temperature from the second preset drying temperature to obtain a first difference value, or, under the condition that the drying temperature is less than the first preset drying temperature, subtracts the first preset drying temperature from the drying temperature to obtain a second difference value,

[0021] Determining to increase the pipe diameter by using a first diameter adjustment coefficient based on a comparison result that the first difference is greater than a first preset difference;

[0022] Determining to increase the pipe diameter by using a second diameter adjustment coefficient based on a comparison result that the first difference is less than or equal to the first preset difference;

[0023] Based on the comparison result that the second difference is greater than the second preset difference, determining to use a third diameter adjustment coefficient to reduce the pipe diameter;

[0024] Based on the comparison result that the second difference is less than or equal to the second preset difference, it is determined to use the fourth diameter adjustment coefficient to reduce the pipe diameter.

[0025] Furthermore, the regulating component determines to open a temperature compensation component or a temperature reduction component based on the actual drying temperature for a drying environment that still does not meet the standard after the electric valve is adjusted.

[0026] Furthermore, the regulating component determines that the drying process of the dehydrated mixed gas does not meet the standard according to the comparison result that the moisture content in the mixed gas in the drying bed is greater than the preset moisture content.

[0027] Furthermore, the regulating component obtains a difference percentage by subtracting the moisture content from the preset moisture content for a drying process that does not meet the standard.

[0028] Determining to adjust the mixing ratio of the adsorbent based on the comparison result that the difference percentage is greater than a preset percentage;

[0029] The adjustment of the rotation speed of the adsorbent is determined based on the comparison result that the difference percentage is less than or equal to the preset percentage.

[0030] Further, the regulating component regulating the mixing ratio includes subtracting the difference percentage from the preset percentage to obtain a first percentage difference, and determining to use a first ratio adjustment coefficient to regulate the mixing ratio based on a comparison result that the first percentage difference is greater than the first preset percentage difference;

[0031] Based on the comparison result that the first percentage difference is less than or equal to the first preset percentage difference, it is determined to use a second proportion adjustment coefficient to adjust the mixing ratio.

[0032] Further, the regulating component regulating the rotation speed includes subtracting the preset percentage from the difference percentage to obtain a second percentage difference, and determining to use the first speed regulation coefficient to regulate the rotation speed based on a comparison result that the second percentage difference is greater than a second preset percentage difference;

[0033] Based on the comparison result that the second percentage difference is less than or equal to the second preset percentage difference, it is determined that the second rotation speed adjustment coefficient is used to adjust the rotation speed.

[0034] Compared with the prior art, the beneficial effects of the present invention are that most of the condensed water in the compressed mixed gas is removed by a cooling water separator, thereby reducing the dehydration load of the drying bed, reducing the number of regeneration times of the adsorbent, and saving regeneration energy consumption; the drying bed adopts a "zero gas consumption" regeneration technology, does not consume carbon dioxide gas and foreign gas, and achieves the purpose of drying the gas through the cyclic regeneration of the adsorbent to adsorb the moisture in the gas, without generating any harmful gas emissions; the moisture in the carbon dioxide mixed gas can be effectively removed through the drying process, and the presence of moisture will reduce the efficiency of subsequent desulfurization and denitrification of oxides and alcohol amines. The moisture will compete with the desulfurizer or adsorbent for adsorption, thereby reducing its ability to desulfurize or denitrify oxides and alcohol amines, and ultimately affecting the refining purity of carbon dioxide, so the recovery and refining efficiency of carbon dioxide is improved by monitoring the drying process.

[0035] Furthermore, the present invention overcomes the problem of powdering of the adsorbent due to loose filling of the adsorbent in the drying bed by arranging a plurality of discs for placing the adsorbent inside the drying bed. The discs rotating in opposite directions increase the contact area between the gas and the adsorbent, thereby improving the drying accuracy without affecting the adsorption efficiency, thereby further improving the recovery and refining efficiency of carbon dioxide.

[0036] Furthermore, the present invention prepares the adsorbent by mixing molecular sieve and alumina. The molecular sieve has stronger adsorption capacity than alumina but weaker pressure resistance, and is prone to pulverization when the pressure is high, which affects the service life of the adsorbent. Mixing alumina and molecular sieve as an adsorbent can extend the service life of the adsorbent while ensuring the adsorption effect, thereby further improving the recovery and refining efficiency of carbon dioxide.

[0037] Furthermore, the present invention reduces the energy consumption of the recovery and refining process by recovering the heat of the desulfurization process for the drying process; the adsorption effect and adsorption speed can be guaranteed only when the drying process meets a certain temperature range, and the electric valve is adjusted to maintain the temperature of the drying bed; by determining whether the drying process meets the standards through the water content of the gas after drying and making targeted adjustments to the process that does not meet the standards, the recovery and refining efficiency of carbon dioxide is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the structure of a high-concentration carbon dioxide recovery and refining device according to an embodiment of the present invention;

[0039] Figure 2 This is a schematic diagram of the structure of an adsorption tower according to an embodiment of the present invention;

[0040] Figure 3 A flow chart for determining whether a drying environment meets the standards according to an embodiment of the present invention;

[0041] Figure 4 A flow chart of determining whether a drying process of a dehydrated mixed gas meets a standard according to an embodiment of the present invention;

[0042] In the figure: 1. Cooling water separator; 2. Drying bed; 21. Adsorption tower; 211. Disc; 22. Regeneration tower; 212. Adsorbent; 3. Adsorption bed; 4. Precooler; 5. Liquefaction unit; 6. Compressor; 7. Product tank. DETAILED DESCRIPTION

[0043] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0045] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0046] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] See also Figure 1-Figure 4 As shown, Figure 1 This is a schematic diagram of the structure of a high-concentration carbon dioxide recovery and refining device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of an adsorption tower according to an embodiment of the present invention; Figure 3 A flow chart for determining whether a drying environment meets the standards according to an embodiment of the present invention; Figure 4 The present invention is a flowchart for determining whether the drying process of the dehydrated mixed gas meets the standard.

[0048] The embodiment of the present invention provides a high-concentration carbon dioxide recovery and refining device, comprising:

[0049] A compression unit, used for compressing the carbon dioxide mixed gas to obtain a compressed mixed gas;

[0050] The purification unit is connected to the compression unit and includes a purification component, a data acquisition component, a heat transfer component and a control component.

[0051] The purification component includes a cooling water separator 1, a drying bed 2 and an adsorption bed 3. The cooling water separator 1 is used to cool the compressed mixed gas to separate the condensed water in the compressed mixed gas to obtain a dehydrated mixed gas. The drying bed 2 is used to dry the dehydrated mixed gas to obtain a dry mixed gas. The adsorption bed 3 is used to remove sulfur-containing components from the dry mixed gas to obtain a desulfurized mixed gas, and to remove heavy component impurities from the desulfurized mixed gas to obtain purified gas.

[0052] The data acquisition component includes a moisture content sensor disposed at the air outlet of the drying bed 2 and a temperature sensor disposed inside the drying bed 2;

[0053] A heat transfer component, used to transfer the heat of the desulfurization process to the desiccant bed 2, comprising a heat exchange tank with a temperature compensation component and a temperature reduction component connected to the adsorption bed 3, the heat exchange tank is connected to the desiccant bed 2 through a heat transfer pipe, and an electric valve is provided at one end of the heat transfer pipe close to the desiccant bed 2;

[0054] The regulating component is used to determine whether the drying environment meets the standard according to the drying temperature in the drying bed 2, and adjust the electric valve for the drying environment that does not meet the standard, and determine whether the drying process of the dehydrated mixed gas meets the standard according to the moisture content in the mixed gas of the drying bed 2, and determine to adjust the mixing ratio of the adsorbent 212 or the rotation speed of the adsorbent 212 according to the moisture content difference for the drying process that does not meet the standard;

[0055] A liquefaction unit 5, which is connected to the purification unit and is used to cool and liquefy the purified gas to obtain liquefied purified gas;

[0056] The distillation unit is connected to the liquefaction unit 5 and is used to remove light component impurities from the liquefied purified gas through a reboiling process to obtain food-grade liquid carbon dioxide.

[0057] Specifically, the compression unit compresses the carbon dioxide mixer to 2.0 MPa, and pressure regulating valves are provided at the outlet of the compressor 6 and the inlet of the water separation tank to control the pressure to 0.105 MPa to prevent the compressor 6 from evacuating.

[0058] Specifically, the cooling water separator 1 reduces the temperature of the carbon dioxide mixer to 10 degrees or below to remove condensed water, thereby reducing the dehydration load of the drying bed 2, reducing the number of regenerations, and saving regeneration energy consumption.

[0059] Specifically, the regeneration process of the drying bed 2 is divided into two stages: hot blowing and cold blowing. During the hot blowing process, a blower is used to pass air into the electric heater to heat it up and then enter the regenerated drying bed 2 for heating. After the drying bed 2 is heated, it enters the cooling cold blowing stage. A blower is used to pass cold air into the drying bed 2. The cold air takes away the heat of the drying bed 2 and then enters the cooler to cool it down to room temperature. The cooled cold air enters the blower inlet and is sent to the drying bed 2 again for cooling, so that it can be recycled and used to achieve "zero gas consumption".

[0060] Specifically, the heavy impurities include but are not limited to nitrogen oxides and alcohol amines.

[0061] Specifically, the moisture content sensor and the temperature sensor can accurately obtain the moisture content of the gas at the outlet of the drying bed 2 and the temperature inside the drying bed 2, and the specific models and parameters are not limited.

[0062] Specifically, the working process of the liquefaction unit 5 is as follows: the purified gas enters the precooler 4, exchanges heat with the non-condensable gas from the top of the distillation tower, cools down to 8°C and then enters the condenser, exchanges cold with the refrigerant Freon from the refrigeration unit in the condenser and cools down to -25°C, while the carbon dioxide component in the purified gas is liquefied into liquid carbon dioxide. The refrigeration unit uses a screw unit with Freon as the refrigerant, is equipped with a refrigerator economizer, and adopts low-temperature barrel pump technology. During the flow of the refrigerant, the pressure of the refrigerant in the pipeline drops due to the booster pressure, causing the refrigerant to vaporize after the pressure in the pipeline is lower than the saturated steam, resulting in a waste of the refrigerant's cold capacity. The use of a refrigerant economizer with a low-temperature barrel pump increases the refrigeration efficiency of the refrigerant by at least 10%. At the same time, since the heat exchanger is filled with refrigerant, the heat exchange area occupied by the gas phase volatilization is reduced, saving the heat exchanger space.

[0063] Specifically, the liquefied purified gas flows into the reboiler at the bottom of the distillation tower, and after being heated by the reboiler, the light components with low boiling points are released from the top of the tower, and food-grade liquid carbon dioxide is obtained at the bottom of the tower. The light component impurities include but are not limited to H2, O2, Ar, N2 and CH4.

[0064] Specifically, the drying bed 2 includes an adsorption tower 21 and a regeneration tower 22. A plurality of rotatable disks 211 for placing adsorbents 212 are vertically arranged in parallel inside the adsorption tower 21 and the regeneration tower 22, wherein the rotation directions of any two adjacent disks 211 are opposite.

[0065] Specifically, the adsorption tower 21 is used to adsorb moisture in the mixed gas, and the regeneration tower 22 is used to release moisture in the adsorbent 212. The adsorption tower 21 and the regeneration tower 22 work simultaneously, and the adsorption tower 21 and the regeneration tower 22 can be switched to each other.

[0066] Specifically, the number of the disks 211 for placing the adsorbent 212 is determined according to actual needs and is not specifically limited.

[0067] Specifically, the adsorbent 212 is a mixture of molecular sieve and alumina.

[0068] Specifically, the initial setting of the mixing ratio of the adsorbent 212 is: the ratio of molecular sieve to alumina is 3 / 7.

[0069] Specifically, the regulating component determines that the drying environment does not meet the standard based on the comparison result that the drying temperature is less than the first preset drying temperature or greater than the second preset drying temperature;

[0070] The regulating component determines that the drying environment meets the standard based on a comparison result that the drying temperature is greater than or equal to a first preset drying temperature and less than or equal to a second preset drying temperature.

[0071] Specifically, the range of the first preset drying temperature is set to [48°C, 52°C], and 50°C is preferred in the embodiment of the present invention; the range of the second preset drying temperature is set to [53°C, 58°C], and 55°C is preferred in the embodiment of the present invention.

[0072] Specifically, when the temperature in the drying bed 2 is low, the space in the pore structure of the molecular sieve is relatively small, and the movement speed of the molecules is slow, resulting in a decrease in the adsorption rate of water molecules; as the temperature in the drying bed 2 increases, the space in the pore structure of the molecular sieve gradually increases, and the movement speed of the molecules accelerates, which is conducive to the water molecules diffusing to the surface of the adsorbent 212 faster and being adsorbed, but the high temperature condition will cause excessive consumption of drying energy and increase the drying cost.

[0073] Specifically, the regulating component, under the condition that the drying temperature is greater than the second preset drying temperature, subtracts the drying temperature from the second preset drying temperature to obtain a first difference value, or, under the condition that the drying temperature is less than the first preset drying temperature, subtracts the first preset drying temperature from the drying temperature to obtain a second difference value.

[0074] Determining to increase the pipe diameter by using a first diameter adjustment coefficient based on a comparison result that the first difference is greater than a first preset difference;

[0075] Determining to increase the pipe diameter by using a second diameter adjustment coefficient based on a comparison result that the first difference is less than or equal to the first preset difference;

[0076] Based on the comparison result that the second difference is greater than the second preset difference, determining to use a third diameter adjustment coefficient to reduce the pipe diameter;

[0077] Based on the comparison result that the second difference is less than or equal to the second preset difference, it is determined to use the fourth diameter adjustment coefficient to reduce the pipe diameter.

[0078] Specifically, the pipe diameter is increased or decreased by the diameter adjustment coefficient, and the adjusted pipe diameter is input into the control panel of the electric valve. The electric valve automatically adjusts to make the pipe diameter meet the requirements. The value range of the first diameter adjustment coefficient is set to [1.25, 1.45], and 1.35 is preferably used in the embodiment of the present invention; the value range of the second diameter adjustment coefficient is set to [1.01, 1.24], and 1.15 is preferably used in the embodiment of the present invention; the value range of the third diameter adjustment coefficient is set to [0.8, 0.9], and 0.85 is preferably used in the embodiment of the present invention; the value range of the fourth diameter adjustment coefficient is set to [0.91, 0.99], and 0.95 is preferably used in the embodiment of the present invention.

[0079] Specifically, the increase in the electric valve means that the diameter of the pipeline becomes larger, the gas flow rate in the pipeline becomes faster, the heat exchange time with the drying bed 2 becomes shorter, and the temperature in the drying bed 2 decreases. The decrease in the electric valve means that the diameter of the pipeline decreases, the gas flow rate in the pipeline becomes slower, the heat exchange time with the drying bed 2 becomes longer, and the temperature in the drying bed 2 increases.

[0080] Specifically, the regulating component determines to open a temperature compensation component or a temperature reduction component based on the actual drying temperature for a drying environment that still does not meet the standard after the electric valve is adjusted.

[0081] Specifically, when the actual drying temperature is lower than the first preset drying temperature, the temperature compensation component is turned on until the drying temperature meets the standard; when the actual drying temperature is higher than the second preset drying temperature, the temperature reduction component is turned on until the drying temperature meets the standard.

[0082] Specifically, the regulating component determines that the drying process of the dehydrated mixed gas does not meet the standard according to the comparison result that the moisture content in the mixed gas in the drying bed 2 is greater than the preset moisture content.

[0083] Specifically, the preset moisture content value range is set to [15ppm, 25ppm], and 20ppm is preferred in the embodiment of the present invention.

[0084] Specifically, the regulating component obtains a difference percentage by subtracting the moisture content from the preset moisture content for a drying process that does not meet the standard.

[0085] Determining to adjust the mixing ratio of the adsorbent 212 based on the comparison result that the difference percentage is greater than a preset percentage;

[0086] Based on the comparison result that the difference percentage is less than or equal to the preset percentage, it is determined to adjust the rotation speed of the adsorbent 212 .

[0087] Specifically, the value range of the preset percentage is set to [20%, 40%], and 30% is preferred in the embodiment of the present invention.

[0088] Specifically, the regulating component regulating the mixing ratio includes subtracting the difference percentage from the preset percentage to obtain a first percentage difference, and determining to use a first ratio adjustment coefficient to regulate the mixing ratio based on a comparison result that the first percentage difference is greater than the first preset percentage difference;

[0089] Based on the comparison result that the first percentage difference is less than or equal to the first preset percentage difference, it is determined to use a second proportion adjustment coefficient to adjust the mixing ratio.

[0090] Specifically, the mixing ratio is: the mixing ratio of molecular sieve and alumina is 3 / 7, the ratio is adjusted by multiplying the ratio adjustment coefficient by the mixing ratio to obtain the value after adjustment, and the molecular sieve and alumina are mixed at the adjusted ratio.

[0091] Specifically, the value range of the first preset percentage difference is set to [3%, 6%], and 4% is preferred in the embodiment of the present invention.

[0092] Specifically, the value range of the first proportional adjustment coefficient is set to [1.3, 1.5], and 1.4 is preferably used in the embodiment of the present invention; the value range of the second proportional adjustment coefficient is set to [1.1, 1.29], and 1.2 is preferably used in the embodiment of the present invention.

[0093] Specifically, the regulating component regulating the rotation speed includes subtracting the preset percentage from the difference percentage to obtain a second percentage difference, and determining to use the first speed regulation coefficient to regulate the rotation speed based on a comparison result that the second percentage difference is greater than a second preset percentage difference;

[0094] Based on the comparison result that the second percentage difference is less than or equal to the second preset percentage difference, it is determined that the second rotation speed adjustment coefficient is used to adjust the rotation speed.

[0095] Specifically, the value range of the first preset percentage difference is set to [1%, 4%], and 2% is preferred in the embodiment of the present invention.

[0096] Specifically, the value range of the first speed adjustment coefficient is set to [1.2, 1.4], and 1.25 is preferably used in the embodiment of the present invention; the value range of the second speed adjustment coefficient is set to [1.05, 1.19], and 1.15 is preferably used in the embodiment of the present invention.

[0097] Specifically, the speed is adjusted by the speed adjustment coefficient as follows: multiply the speed before adjustment, for example 60r / min, by the speed adjustment coefficient, for example 1.25 to obtain 75r / min, which is the speed after adjustment. The speed before adjustment and the speed adjustment coefficient are only used as examples and are not specifically limited.

[0098] Specifically, the greater the rotation speed, the longer the contact time between the compressed mixed gas and the adsorbent 212 is, and the more thorough the moisture adsorption is.

[0099] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A high concentration carbon dioxide recovery and purification device, characterized in that: include: A compression unit, used for compressing the carbon dioxide mixed gas to obtain a compressed mixed gas; The purification unit is connected to the compression unit and includes a purification component, a data acquisition component, a heat transfer component and a control component, wherein: The purification component includes a cooling water separator, a drying bed and an adsorption bed, the cooling water separator is used to cool the compressed mixed gas to separate the condensed water in the compressed mixed gas to obtain a dehydrated mixed gas, the drying bed is used to dry the dehydrated mixed gas to obtain a dry mixed gas, the adsorption bed is used to remove the sulfur-containing components of the dry mixed gas to obtain a desulfurized mixed gas, and remove heavy component impurities from the desulfurized mixed gas to obtain purified gas; The data acquisition component includes a moisture content sensor disposed at the air outlet of the drying bed and a temperature sensor disposed inside the drying bed; A heat transfer component, used to transfer the heat of the desulfurization process to the desiccant bed, comprising a heat exchange tank connected to the adsorption bed and having a temperature compensation component and a temperature reduction component, the heat exchange tank being connected to the desiccant bed through a heat transfer pipe, and an electric valve being arranged at one end of the heat transfer pipe close to the desiccant bed; The regulating component is used to determine whether the drying environment meets the standard according to the drying temperature in the drying bed, and adjust the electric valve for the drying environment that does not meet the standard, and determine whether the drying process of the dehydrated mixed gas meets the standard according to the moisture content in the mixed gas in the drying bed, and adjust the mixing ratio of the adsorbent or the rotation speed of the adsorbent according to the moisture content difference for the drying process that does not meet the standard; a liquefaction unit connected to the purification unit and used to cool and liquefy the purified gas to obtain liquefied purified gas; A distillation unit connected to the liquefaction unit for removing light component impurities from the liquefied purified gas through a reboiling process to obtain food-grade liquid carbon dioxide; The regulating component determines that the drying environment does not meet the standard based on a comparison result that the drying temperature is less than a first preset drying temperature or greater than a second preset drying temperature; The regulating component obtains a first difference value by subtracting the drying temperature from the second preset drying temperature under the condition that the drying temperature is greater than the second preset drying temperature. Determining to increase the pipe diameter by using a first diameter adjustment coefficient based on a comparison result that the first difference is greater than a first preset difference; Based on the comparison result that the first difference is less than or equal to the first preset difference, it is determined to use the second diameter adjustment coefficient to increase the pipe diameter.

2. The high-concentration carbon dioxide recovery and purification device according to claim 1, characterized in that: The drying bed comprises an adsorption tower and a regeneration tower, wherein a plurality of rotatable disks for placing adsorbents are respectively arranged in parallel in the vertical direction inside the adsorption tower and the regeneration tower, wherein the rotation directions of any two adjacent disks are in opposite directions.

3. The high-concentration carbon dioxide recovery and purification device according to claim 1, characterized in that: The adsorbent is a mixture of molecular sieve and alumina.

4. The high-concentration carbon dioxide recovery and purification device according to claim 3, characterized in that: The regulating component obtains a second difference value by subtracting the first preset drying temperature from the drying temperature under the condition that the drying temperature is less than the first preset drying temperature. Based on the comparison result that the second difference is greater than the second preset difference, determining to use a third diameter adjustment coefficient to reduce the pipe diameter; Based on the comparison result that the second difference is less than or equal to the second preset difference, it is determined to use the fourth diameter adjustment coefficient to reduce the pipe diameter.

5. The high-concentration carbon dioxide recovery and purification device according to claim 4, characterized in that: The regulating component determines to open a temperature compensation component or a temperature reduction component based on the actual drying temperature for a drying environment that still does not meet the standard after the electric valve is adjusted.

6. The high-concentration carbon dioxide recovery and purification device according to claim 5, characterized in that: The regulating component determines that the drying process of the dehydrated mixed gas does not meet the standard according to the comparison result that the moisture content in the mixed gas in the drying bed is greater than the preset moisture content.

7. The high-concentration carbon dioxide recovery and purification device according to claim 6, characterized in that: The regulating component obtains a difference percentage by subtracting the moisture content from the preset moisture content for a drying process that does not meet the standard. Determining to adjust the mixing ratio of the adsorbent based on the comparison result that the difference percentage is greater than a preset percentage; The adjustment of the rotation speed of the adsorbent is determined based on the comparison result that the difference percentage is less than or equal to the preset percentage.

8. The high-concentration carbon dioxide recovery and purification device according to claim 7, characterized in that: The regulating component regulating the mixing ratio includes subtracting the difference percentage from the preset percentage to obtain a first percentage difference, and determining to use a first ratio regulating coefficient to regulate the mixing ratio based on a comparison result that the first percentage difference is greater than the first preset percentage difference; Based on the comparison result that the first percentage difference is less than or equal to the first preset percentage difference, it is determined to use a second proportion adjustment coefficient to adjust the mixing ratio.

9. The high-concentration carbon dioxide recovery and purification device according to claim 7, characterized in that: The regulating component regulating the rotation speed includes subtracting the preset percentage from the difference percentage to obtain a second percentage difference, and determining to use the first speed regulation coefficient to regulate the rotation speed based on a comparison result that the second percentage difference is greater than the second preset percentage difference; Based on the comparison result that the second percentage difference is less than or equal to the second preset percentage difference, it is determined that the second rotation speed adjustment coefficient is used to adjust the rotation speed.

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