Supergravity adsorption bed and supergravity gas-solid adsorption isotherm measurement system and method

Abstract

The invention relates to the technical field of gas-solid adsorption equipment, in particular to a super-gravity adsorption bed, a super-gravity gas-solid adsorption isotherm measuring system comprising the super-gravity adsorption bed and a method for measuring a super-gravity gas-solid adsorption isotherm by using the system. Comprising a rotary adsorption bed main body, a cooling outer cavity and an adjustable-speed motor, wherein the adjustable-speed motor is arranged above the rotary adsorption bed main body; the rotary adsorption bed main body sequentially comprises an exhaust chamber, a rotary packed bed and a gas inlet chamber which can realize gas communication from top to bottom, a cooling inner cavity is formed in the center of the rotary packed bed, the cooling inner cavity is connected with a hollow pipe, and the rotary packed bed is in power connection with a speed regulating motor through a solid shaft; and a cooling outer cavity is arranged on the annular outer side of the rotating packed bed. Continuous adsorption and desorption of adsorbate under different rotating speeds, different temperatures and different concentrations can be achieved, and finally isothermal adsorption lines under different temperatures and different supergravity factors can be drawn.

Description

Technical Field

[0001] The present invention relates to the technical field of gas-solid adsorption equipment, in particular to a supergravity adsorption bed, a supergravity gas-solid adsorption isotherm measurement system comprising the supergravity adsorption bed, and a method for measuring the supergravity gas-solid adsorption isotherm using the device. Background Art

[0002] Compared with existing adsorption bed equipment, ultra-gravity technology has the advantages of good heat and mass transfer, small equipment size, and low energy consumption. It can solve the industry problems of low adsorption efficiency and small adsorption capacity in traditional adsorption equipment (fixed bed, etc.) and processes, and is a very novel research topic. The adsorption isotherm is a necessary parameter for the design and optimization of adsorption devices, and is a specific description of adsorption equilibrium. Therefore, the measurement of gas-solid adsorption isotherms under ultra-gravity is very important.

[0003] At present, the existing adsorption isotherm measurement methods are mostly volume measurement and gravimetric analysis, that is, a quantitative adsorbate is introduced into the constant temperature control chamber through a multi-component distributor to ensure that the adsorbate is adsorbed by the adsorbent under a constant temperature environment. When the adsorption rate and desorption rate reach a balance, the adsorption is completed. After each adsorption is completed, a precision weighing instrument is required to calculate the volume or weight of the adsorbate. When desorbing, the adsorbent needs to be taken out and baked to remove the adsorbate.

[0004] If the above existing methods are directly applied to the measurement of supergravity adsorption isotherms, the following defects will occur: (1) The existing gravimetric analysis method usually only takes a small amount of adsorbent (a few grams or even a few micrograms) for the experiment, which requires high precision of the weighing equipment. The weighing method will inevitably produce errors in a supergravity environment; (2) During the high-speed rotation of the motor in the supergravity field, the temperature of the experimental environment will rise, affecting the normal operation of the constant temperature equipment; (3) After each experiment is completed, the adsorbent needs to be taken out and dried for desorption, which is time-consuming and labor-intensive. If the adsorbent is a harmful substance, there is also a risk of harming the operator's health. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned defects of the prior art, and proposes a supergravity adsorption bed, a supergravity gas-solid adsorption isotherm measurement system and a method, which can realize continuous adsorption and desorption of adsorbates at different rotation speeds, different temperatures and different concentrations, and finally draw isothermal adsorption lines at different temperatures and different supergravity factors; at the same time, the supergravity adsorption bed can also be used for dehumidification and waste gas treatment.

[0006] The technical solution of the present invention is: a supergravity adsorption bed, which includes a rotating adsorption bed body, a cooling outer cavity and a speed regulating motor, wherein the speed regulating motor is arranged above the rotating adsorption bed body;

[0007] The main body of the rotating adsorption bed includes, from top to bottom, an exhaust chamber capable of achieving gas communication, a rotating packed bed and an air inlet chamber. A cooling inner cavity is provided at the center of the rotating packed bed, which is connected to a hollow tube. The rotating packed bed is connected to the speed regulating motor through a solid shaft.

[0008] A cooling outer chamber is arranged on the annular outer side of the rotating packed bed.

[0009] In the present invention, the main body of the rotary adsorption bed comprises a shell, and the shell is provided with an exhaust chamber, a rotary packed bed, and an air inlet chamber from top to bottom. The exhaust chamber is provided with rotary blades, and the rotary blades are fixed on a solid shaft.

[0010] The shell includes an annular side wall, a top plate and a bottom plate, the speed regulating motor is fixedly arranged on the top plate, and the bottom plate is connected to the adsorption bed support below the top plate;

[0011] An air inlet pipe and an exhaust pipe of a vacuum pump are arranged at the annular side wall corresponding to the exhaust chamber, an air inlet pipe is arranged at the annular side wall corresponding to the air inlet chamber, the inner walls of the annular side wall of the rotating packing bed are dynamically sealed, a cooling outer cavity is fixed at the outer wall of the shell corresponding to the rotating packing bed, a cooling outer cavity water inlet is arranged at the upper part of the cooling outer cavity, and a cooling outer cavity water outlet is arranged at the lower part of the cooling outer cavity;

[0012] Mechanical sealing mechanisms are respectively arranged between the solid shaft and the top plate of the shell, and between the hollow shaft and the bottom plate of the shell.

[0013] The rotating body packing bed comprises an annular outer wall, an annular inner wall, an upper cover plate with holes and a circular bottom plate with holes;

[0014] The annular adsorbent cavity formed between the annular outer wall and the annular inner wall is filled with an adsorbent, and the annular inner wall forms a cooling inner cavity filled with cooling water;

[0015] The perforated upper cover plate and the circular perforated bottom plate corresponding to the cooling inner cavity are in the shape of sealed plates, and the perforated upper plate and the circular perforated bottom plate corresponding to the cooling outer cavity are respectively provided with a plurality of ventilation holes at intervals.

[0016] The rotating packed bed is cylindrical;

[0017] The perforated upper cover plate is in the shape of a three-quarter circular plate, and the adsorbent is filled into the rotating packed bed through a quarter opening of the perforated upper cover plate;

[0018] A movable feed cover is sealed above one quarter of the opening of the upper cover with holes, a shaft sleeve is provided in the middle of the movable feed cover, the shaft sleeve is fixed to the solid shaft by bolts, the movable feed cover corresponding to the cooling inner cavity is in the shape of a sealing plate, and the movable feed cover corresponding to the adsorbent cavity is provided with a plurality of vent holes;

[0019] When the movable feed cover is in a locked state, the movable feed plate is located directly above one quarter of the opening of the upper cover with holes and is sealed to the upper cover with holes; when the movable feed cover is in a loosened state, one quarter of the opening of the upper cover with holes is in an open state.

[0020] The mechanical sealing mechanism comprises:

[0021] The sealing base is sealed and connected to the top plate or the bottom plate of the shell. The sealing base is sleeved on the outside of the solid shaft or the hollow shaft, and the sealing base and the solid shaft or the hollow shaft are rotatably connected through a bearing.

[0022] The stationary ring, the surface of the sealing base facing away from the shell is provided with a groove, the stationary ring is fixedly arranged in the groove, and a sealing ring is provided between the stationary ring and the bottom of the groove;

[0023] A dynamic ring is provided on the outer side of the sealing base away from the shell, a sealing ring is provided between the dynamic ring and the solid shaft or the hollow shaft, and the dynamic ring is fixedly connected to the solid shaft or the hollow shaft.

[0024] The present invention also discloses a supergravity gas-solid adsorption isotherm measurement system comprising the above-mentioned supergravity adsorption bed, wherein the air inlet chamber of the supergravity adsorption bed is connected to the adjustable power heating chamber, the air inlet of the adjustable power heating chamber is connected to the mixing chamber, and the air inlet of the mixing chamber is connected in parallel with the carrier gas tank, the adsorbent tank, and the ultrasonic humidifier;

[0025] The cooling inner cavity and the cooling outer cavity of the supergravity adsorption bed are respectively connected to a water tank, and a pump is provided at the water outlet of the water tank;

[0026] The exhaust chamber of the supergravity adsorption bed is connected to the vacuum pump and the waste gas storage tank respectively.

[0027] A fourth gas regulating valve is provided on the connecting pipeline between the carrier gas tank and the air inlet of the mixing chamber, a third gas regulating valve is provided on the connecting pipeline between the adsorbent tank and the air inlet of the mixing chamber, a second gas regulating valve is provided on the connecting pipeline between the ultrasonic humidifier and the air inlet of the mixing chamber, and a first gas regulating valve for controlling air entry is provided at the air inlet of the mixing chamber;

[0028] When the adsorbate gas is a gas other than water vapor in the air, the fourth gas regulating valve and the third gas regulating valve are opened, and the first gas regulating valve and the second gas regulating valve are closed;

[0029] When the adsorbent is water vapor in the air, the fourth gas regulating valve and the third gas regulating valve are closed, and the first gas regulating valve and the second gas regulating valve are opened to control the moisture content of the air;

[0030] A fifth gas regulating valve is provided on the connecting pipeline between the exhaust pipe of the ultra-gravity adsorption bed and the waste gas storage tank, and a sixth gas regulating valve for directly discharging the adsorbed gas is also provided at the exhaust pipe of the ultra-gravity adsorption bed;

[0031] A seventh gas regulating valve is provided on the connecting pipeline between the vacuum pump connecting pipe and the vacuum pump, an eighth gas regulating valve is provided on the connecting pipeline between the vacuum pump and the exhaust gas storage tank, and a ninth gas regulating valve is also provided at the outlet of the vacuum pump for directly discharging the adsorbed gas.

[0032] The present invention also discloses a method for measuring isotherms using the above-mentioned supergravity gas-solid adsorption isotherm measurement system, which comprises the following steps:

[0033] S1. The supergravity adsorption bed is set to a specified rotation speed value, and the adsorbate gas entering the air inlet chamber is adjusted to a specified concentration, flow rate and temperature. Under the suction action of the vacuum pump or the rotating blades, the adsorbate gas is sucked into the rotating packed bed, and the adsorbent in the rotating packed bed adsorbs the adsorbate gas, and the adsorbed gas is discharged through the exhaust chamber;

[0034] S2. Record the ratio of the gas concentration at the exhaust pipe of the exhaust chamber to the adsorbate gas concentration at the intake pipe of the intake chamber according to time, draw a gas-solid adsorption breakthrough curve, and calculate the equilibrium adsorption amount using a dynamic method;

[0035] S3, using hot desorption gas to vacuum purge and desorb the high-gravity adsorption bed, so that the high-gravity adsorption bed returns to its initial state;

[0036] S4, repeating steps S1 to S3 to obtain the equilibrium adsorption amount of the supergravity adsorption bed at the same rotation speed and temperature and different adsorbate gas concentrations, and then drawing an isothermal adsorption curve.

[0037] In step S1, cooling water is injected into the cooling inner cavity and the cooling outer cavity;

[0038] When drawing the high-gravity isothermal adsorption curve, the speed regulating motor drives the high-gravity adsorption bed to rotate, and the speed of the high-gravity adsorption bed is controlled within 1300r / min. At this time:

[0039] When the adsorbent gas is a harmful gas, the fifth gas regulating valve is opened, the sixth gas regulating valve and the seventh gas regulating valve are closed, and the adsorbed gas is stored in the waste gas storage tank;

[0040] When the adsorbent gas is harmless gas and water vapor in the air, the sixth gas regulating valve is opened, the fifth gas regulating valve and the seventh gas regulating valve are closed, and the adsorbed gas is directly discharged into the atmosphere;

[0041] When drawing the fixed bed isothermal adsorption curve, the speed regulating motor does not work, the speed of the supergravity adsorption bed is 0, and the vacuum pump is working. At this time:

[0042] When the adsorbent gas is a harmful gas, the seventh gas regulating valve and the eighth gas regulating valve are opened, the fifth gas regulating valve, the sixth gas regulating valve and the ninth gas regulating valve are closed, and the adsorbed gas is stored in the waste gas storage tank;

[0043] When the adsorbent gas is harmless gas and water vapor in the air, the seventh gas regulating valve and the ninth gas regulating valve are opened, the fifth gas regulating valve, the sixth gas regulating valve and the eighth gas regulating valve are closed, and the adsorbed gas is directly discharged into the atmosphere.

[0044] In step S2, the formula for solving the equilibrium adsorption amount using the dynamic method is:

[0045]

[0046] Among them, t is time, unit is min; q e is the equilibrium adsorption capacity, in mg / g; C0 is the adsorbate gas concentration at the inlet pipe of the supergravity adsorption bed, in mg / L; C i is the concentration of adsorbate gas at the exhaust pipe of the supergravity adsorption bed, in mg / L; W is the mass of the adsorbent, in g; Q is the volume flow rate of the adsorbate, in L / min; t e It is the time when the concentration of adsorbate gas at the exhaust pipe approaches the concentration of adsorbate gas at the inlet pipe, in minutes.

[0047] In step S3, the water in the cooling outer cavity and the cooling inner cavity is discharged; the speed of the speed regulating motor remains unchanged, and the vacuum pump works;

[0048] When the adsorbate gas is a harmless gas, the second gas regulating valve, the first gas regulating valve and the third gas regulating valve are closed, the fourth gas regulating valve is opened to control the flow rate of nitrogen, and the hot nitrogen is purged and desorbed from the adsorbent during the process in which the vacuum pump causes the hot nitrogen to flow axially from bottom to top in the supergravity adsorption bed, the fifth gas regulating valve, the sixth gas regulating valve and the eighth gas regulating valve are closed, and the seventh gas regulating valve and the ninth gas regulating valve are opened;

[0049] When the adsorbate gas is a harmful gas, the second gas regulating valve, the first gas regulating valve and the third gas regulating valve are closed, the fourth gas regulating valve is opened to control the flow rate of nitrogen, and the hot nitrogen is used to purge and desorb the adsorbent, the fifth gas regulating valve, the sixth gas regulating valve and the ninth gas regulating valve are closed, and the seventh gas regulating valve and the eighth gas regulating valve are opened;

[0050] When the concentration of adsorbate gas at the outlet of the vacuum pump is zero, desorption is completed;

[0051] After desorption is completed, cooling water is injected into the cooling outer cavity and the cooling inner cavity to reduce the temperature of the supergravity adsorption bed to room temperature. The water in the cooling outer cavity and the cooling inner cavity is then discharged and cooling water is re-injected to restore the supergravity adsorption bed to its initial state.

[0052] The beneficial effects of the present invention are:

[0053] (1) By providing a cooling inner cavity and a cooling outer cavity, the adsorption heat and the heat generated during the rotation of the rotating packed bed are taken away, so that the adsorption process remains an isothermal adsorption process. At the same time, the ultra-gravity adsorption bed can be quickly cooled after the desorption is completed, shortening the time to enter the next adsorption process;

[0054] (2) By changing the rotation speed of the high-gravity adsorption bed, the fixed bed adsorption isotherm and the high-gravity adsorption isotherm can be compared;

[0055] (3) The use of fans is reduced by rotating blades, avoiding the heat caused by the motor of the duct fan and reducing energy consumption;

[0056] (4) The present application can use a dynamic method to measure the equilibrium adsorption amount of the adsorbate on the adsorbent, which is simple to operate, reduces the operation time, and has high measurement accuracy.

[0057] (5) The adsorbent used in the present invention has a desorption function, including but not limited to granular adsorbents such as molecular sieves, silica gel, lithium chloride, activated alumina, calcium chloride, activated carbon, etc.;

[0058] (6) The present application can realize continuous adsorption and desorption without stopping the machine, thus shortening the experimental time and reducing the experimental error.

[0059] (7) In addition to measuring the gas-solid adsorption isotherm, this application can also dehumidify and treat the adsorption of organic gases, such as hydrogen sulfide, formaldehyde, toluene, xylene, formaldehyde, etc.;

[0060] In summary, the present application can realize continuous adsorption and desorption of adsorbates at different rotation speeds, different temperatures, and different concentrations, and finally can draw isothermal adsorption lines at different temperatures and different hypergravity factors; at the same time, the hypergravity adsorption bed can also be used for dehumidification and waste gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic diagram of the main structure of the supergravity gas-solid adsorption bed;

[0062] Figure 2 It is a schematic diagram of the cross-sectional structure of a supergravity gas-solid adsorption bed;

[0063] Figure 3 It is a structural schematic diagram of a movable feed cover plate and an upper cover plate with holes;

[0064] Figure 4 It is a structural diagram of the mechanical seal mechanism at the solid shaft;

[0065] Figure 5 It is a schematic diagram of the connection structure of the ultra-gravity gas-solid adsorption isotherm measurement system;

[0066] Figure 6 is a schematic diagram of an internal cross section of an adjustable power heater;

[0067] Figure 7 It is a schematic diagram of the internal structure of an ultrasonic humidifier;

[0068] Figure 8 It is a schematic diagram of the supergravity gas-solid adsorption penetration curve.

[0069] In the figure: 1 ultra-gravity adsorption bed; 1.1 air inlet pipe; 1.2 exhaust pipe; 1.3 rotating adsorption bed body; 1.4 cooling outer chamber; 1.5 speed regulating motor; 1.6 coupling; 1.7 mechanical sealing mechanism; 1.8 motor bracket; 1.9 movable cover plate; 1.10 vacuum pump air inlet pipe; 1.11 cooling outer chamber water inlet; 1.12 cooling outer chamber water outlet; 1.13 adsorption bed bracket; 1.14 high-speed rotating movable joint; 1.15 air inlet chamber; 1.16 rotating packing bed; 1.17 cooling inner chamber; 1.18 movable feed cover plate; 1.19 axial sealing ring; 1.20 exhaust chamber; 1.22 hollow shaft; 1.23 bottom plate with holes; 1.24 upper cover plate with holes; 1.25 rotating blades; 1.26 sealing base Seat; 1.27 bearing; 1.28 static ring; 1.29 sealing ring; 1.30 dynamic ring; 1.31 solid shaft; 2 adjustable power heating chamber; 2.1 adjustable power heating rod; 2.2 triangular fin; 3 mixing chamber; 4 ultrasonic humidification chamber; 4.1 ultrasonic generator; 4.2 baffle; 5 carrier gas tank; 6 adsorbent tank; 7 waste gas storage tank; 8 vacuum pump; 9 water tank; 10 water pump; 11 first gas regulating valve; 12 second gas regulating valve; 13 third gas regulating valve; 14 fourth gas regulating valve; 15 fifth gas regulating valve; 16 sixth gas regulating valve; 17 seventh gas regulating valve; 19 eighth gas regulating valve; 20 ninth gas regulating valve; 21 first water valve; 22 second water valve; 23 third water valve. DETAILED DESCRIPTION

[0070] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0071] In the following description, specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0072] like Figures 1 to 4 As shown, the supergravity adsorption bed 1 of the present invention comprises a rotating adsorption bed body 1.3, a cooling outer cavity 1.4 and a speed regulating motor 1.5, wherein the speed regulating motor 1.5 is located above the adsorption bed body 1.3 and is connected to the adsorption bed body 1.3. The cooling outer cavity 1.4 is fixed to the outer middle part of the rotating adsorption bed body 1.3. An adsorption bed bracket 1.13 is fixed to the bottom of the rotating adsorption bed body 1.3, which supports the entire supergravity adsorption bed.

[0073] The main body 1.3 of the rotating adsorption bed includes a shell arranged in the vertical direction, and the interior of the shell is in the shape of a cavity. In this embodiment, the shell is in the shape of a cylindrical tube. The shell is provided with an exhaust chamber 1.20, a rotating packed bed 1.16 and an air inlet chamber 1.15 from top to bottom. The rotating packed bed 1.16 is located in the middle of the shell, the exhaust chamber 1.20 is located above the rotating packed bed 1.16, and the air inlet chamber 1.15 is located below the rotating packed bed 1.16. The exhaust chamber 1.20, the rotating packed bed 1.16 and the air inlet chamber 1.15 are in a gas communication state. The rotating packed bed 1.6 is filled with adsorbent.

[0074] The top of the rotating packed bed 1.16 is rotatably connected to the top of the shell through a solid shaft 1.31, and the bottom of the rotating packed bed 1.16 is rotatably connected to the bottom of the shell through a hollow shaft 1.22. The connection between the solid shaft 1.31 and the top of the shell, and the connection between the hollow shaft 1.22 and the bottom of the shell are both provided with a mechanical sealing mechanism 1.7. The mechanical sealing structure 1.7 is used to seal the shell. Several axial sealing rings 1.19 are provided between the annular outer wall of the rotating packed bed 1.16 and the inner wall of the shell. The axial sealing rings 1.19 are arranged at intervals along the axial direction of the shell. By providing the axial sealing rings 1.19, the gas entering the air inlet chamber 1.15 must be adsorbed by the adsorbent in the rotating packed bed 1.16 before entering the exhaust chamber 1.20.

[0075] The speed regulating motor 1.5 is fixed on the top of the housing, and the output shaft of the speed regulating motor 1.5 is connected to the solid shaft 1.31 through the coupling 1.6. During the operation of the speed regulating motor 1.5, the rotating packing bed 1.16 is driven to rotate through the solid shaft 1.31. In this embodiment, a movable cover plate 1.9 is fixed on the top of the housing, a motor bracket 1.9 is fixed on the movable cover plate 1.9, and the speed regulating motor 1.5 is fixed on the motor bracket 1.8.

[0076] The adsorbate in the present application is a gas, and the adsorbent is a solid adsorbent, including but not limited to molecular sieves, silica gel, lithium chloride, activated aluminum chloride, calcium chloride, activated carbon and other granular adsorbents.

[0077] An air inlet pipe 1.1 is provided at the annular side wall of the shell corresponding to the air inlet chamber 1.15, and the gas enters the air inlet chamber 1.15 through the air inlet pipe 1.1. An exhaust pipe 1.2 and a vacuum pump air inlet pipe 1.10 are provided at the annular side wall of the shell corresponding to the exhaust chamber 1.20. A rotating blade 1.25 is also provided in the exhaust chamber 1.20, and the rotating blade 1.25 is fixed on the solid shaft 1.31. The solid shaft 1.31 rotates while driving the rotating blade 1.25 to rotate. During the rotation of the rotating blade 1.25, a pressure difference is formed between the exhaust chamber 1.20 and the air inlet chamber 1.15, and the gas in the air inlet chamber 1.15 is sucked into the exhaust chamber 1.20, so that the gas forms a flow from bottom to top in the rotating adsorption bed body 1.3.

[0078] A cooling outer chamber 1.4 is fixed to the annular side wall of the shell corresponding to the rotating packed bed 1.16. A cooling outer chamber water inlet 1.11 is provided at the upper part of the cooling outer chamber 1.4. A cooling outer chamber water outlet 1.12 is provided at the lower part of the cooling outer chamber 1.4. The cooling water enters the cooling outer chamber 1.4 from the cooling outer chamber water inlet 1.11. During the circulation in the cooling outer chamber 1.4, the rotating packed bed 1.16 is cooled, and the heat generated by the rotating packed bed 1.16 during the rotation process is absorbed, so that the rotating seasoning bed 1.16 and the adsorbent therein are in a constant temperature state. The cooling water after absorbing the heat flows out from the cooling outer chamber water outlet 1.12.

[0079] The rotating packed bed 1.16 includes an annular inner wall, an annular outer wall, a perforated upper cover plate 1.24 at the top, and a perforated bottom plate 1.23 at the bottom. The annular gap formed between the annular inner wall and the annular outer wall is an adsorbent cavity, which is filled with adsorbent. The annular inner wall forms a cooling inner cavity 1.17, which is connected to the hollow shaft 1.22. The hollow shaft 1.22 is connected to an external water pipe through a high-speed rotating movable joint 1.14, and cooling water flows into or out of the cooling inner cavity 1.17 through the hollow shaft 1.22.

[0080] like Figure 3 As shown, the middle portion of the perforated upper cover plate 1.24 corresponding to the cooling inner cavity 1.17 is in the shape of a closed plate, and the annular side edge of the perforated upper cover plate 1.24 corresponding to the adsorbent cavity is provided with a plurality of vents at intervals to facilitate the flow of gas. Similarly, the middle portion of the perforated bottom plate 1.23 corresponding to the cooling inner cavity 1.17 is in the shape of a closed plate, and the annular side edge of the perforated bottom plate 1.23 corresponding to the adsorbent cavity is provided with a plurality of vents at intervals.

[0081] The middle part of the perforated upper cover plate 1.24, the middle part of the perforated bottom plate 1.23, and the annular inner wall together form a closed cooling inner cavity 1.17. The cooling water entering the cooling inner cavity 1.17 and the cooling water in the cooling outer cavity 1.4 cool the rotating packed bed 1.16 together, further ensuring the constant temperature working environment of the rotating packed bed. The annular side of the perforated upper cover plate 1.24, the annular side of the perforated bottom plate 1.23, the annular inner wall, and the annular outer wall together form an adsorbent cavity. The adsorbate gas enters the adsorbent cavity from the vents on the perforated bottom plate 1.23, is adsorbed by the adsorbent, and then flows out along the vents on the perforated upper cover plate 1.24.

[0082] In this embodiment, in order to facilitate the loading or discharging of the adsorbent into the rotating packed bed, the perforated upper cover plate 1.24 is a three-quarter circular plate, and a movable feed cover plate 1.18 is sealed above the perforated upper cover plate 1.24. The movable feed cover plate 1.18 is a quarter circular plate, and the center of the movable feed cover plate 1.18 is a closed plate, and a plurality of vent holes are arranged at intervals on the annular side. A shaft sleeve is arranged at the center of the movable cover plate 1.18, and the shaft sleeve is sleeved on the solid shaft and fixed to the solid shaft 1.31 by bolts.

[0083] When the movable cover 1.18 is in a locked state, the movable cover 1.18 is located just above the quarter-notch of the upper cover 1.24 with holes, and is in a sealed connection with the upper cover 1.24 with holes. When an external force is applied to the movable cover 1.18 to rotate the movable cover 1.18 to be offset with the quarter-notch of the upper cover 1.24 with holes, the adsorbent can be filled or taken out through the quarter-notch of the upper cover 1.24 with holes.

[0084] The connection between the solid shaft 1.31 and the top of the shell, and the connection between the hollow shaft 1.22 and the bottom of the shell are both provided with mechanical sealing mechanisms with exactly the same structure and the same sealing principle, so this embodiment describes the mechanical sealing mechanism at the connection between the solid shaft 1.31 and the top of the shell.

[0085] like Figure 4As shown, the mechanical seal mechanism includes a sealing base 1.26, a stationary ring 1.28 and a dynamic ring 1.30, and the sealing base 1.26, the stationary ring 1.28 and the dynamic ring 1.30 are all sleeved on the outside of the solid shaft 1.31. Among them, the sealing base 1.26 is located above the top surface of the shell, and the sealing base 1.26 and the top surface of the shell are sealed. A bearing 1.27 is provided at the contact surface between the sealing base 1.26 and the solid shaft 1.31. A groove is provided at the side of the sealing base 1.26 facing away from the shell, and the stationary ring 1.28 is fixed in the groove. In this embodiment, the stationary ring 1.28 is fixed in the groove by interference fit, thereby realizing a fixed connection between the stationary ring 1.28 and the sealing base 1.26. During the rotation of the solid shaft 1.31, the sealing base 1.26 and the stationary ring 1.28 do not rotate with it. A sealing ring 1.29 is provided at the contact surface between the stationary ring 1.28 and the bottom of the groove.

[0086] A moving ring 1.30 is provided on the outer side of the sealing base 1.26 away from the housing. The moving ring 1.30 is fixedly connected to the solid shaft 1.31 by bolts, and a sealing ring is provided at the annular contact surface between the moving ring 1.30 and the solid shaft 1.31. The solid shaft 1.31 rotates, driving the moving ring 1.30 to rotate with it. During the rotation of the moving ring 1.30, the friction between the moving ring 1.30 and the stationary ring 1.28 plays a sealing role.

[0087] The working principle of the supergravity adsorption bed is as follows. After the adsorbate gas enters the air inlet chamber 1.15 through the air inlet pipe 1.1, the speed regulating motor 1.5 drives the rotating packed bed 1.16 to rotate through the solid shaft 1.30, and the rotating blades 1.25 fixed on the solid shaft 1.30 rotate, so that a pressure difference is formed between the exhaust chamber 1.20 and the air inlet chamber 1.15, and the gas in the air inlet chamber 1.15 is sucked into the exhaust chamber 1.20, so that the adsorbate gas moves from bottom to top along the axial direction of the adsorption bed.

[0088] During the upward flow of the adsorbate gas, it first needs to pass through the rotating packed bed 1.16. During the process of passing through the rotating packed bed, the solid adsorbent in the packed bed adsorbs the adsorbate gas. At the same time, driven by the solid shaft 1.30, the packed bed is in a rotating state. By adjusting the rotation speed of the packed bed, the adsorption of the gaseous adsorbate by the solid adsorbent under supergravity is achieved. When the rotating packed bed 1.16 does not rotate, the vacuum pump inlet pipe 1.10 at the exhaust chamber 1.20 is connected to the external vacuum pump. During the operation of the vacuum pump, it can also produce an adsorption effect on the gas in the adsorption bed, so that the adsorbate gas is adsorbed by the adsorbent in the rotating packed bed during the flow from bottom to top, realizing fixed bed gas-solid adsorption.

[0089] The supergravity adsorption bed can achieve continuous adsorption and desorption of adsorbates at different speeds, temperatures and concentrations, thereby drawing isothermal adsorption lines at different temperatures and supergravity factors. In addition, the supergravity adsorption bed can also be used for dehumidification and waste gas treatment.

[0090] In the gas-solid adsorption process, in addition to measuring the isothermal adsorption lines under different hypergravity factors, it can also be used for dehumidification and waste gas treatment.

[0091] In the process of supergravity gas-solid adsorption, in addition to the adsorption heat generated by the adsorption process, the energy consumption of the rotating packed bed during the rotation process will generate a certain amount of heat, resulting in an increase in the temperature of the adsorbent and adsorbate in the adsorption bed. When measuring the supergravity isotherm, the greater the flow rate of the adsorbate gas within a certain range, the greater the maximum adsorption amount. In order to reduce the adsorption error caused by the adsorbate velocity, the inlet flow rate of the adsorbate gas is usually very low. For low-flow adsorbate gas, a slight change in temperature will cause a large jump in the inlet relative pressure. Therefore, insulation is a very important and critical measure for the supergravity adsorption isotherm measurement system. In the adsorption bed, the adsorbent is continuously cooled by cooling water in the cooling outer cavity 1.4 and the cooling inner cavity 1.17 to absorb the heat caused by adsorption heat or mechanical transmission energy loss, so that the adsorbent remains at a constant temperature.

[0092] The present invention also discloses a high gravity gas-solid adsorption isotherm measurement system comprising the high gravity adsorption bed, such as Figure 5 As shown, the device includes a supergravity adsorption bed 1, an adjustable power heating chamber 2, a mixing chamber 3, a water tank 9 and a vacuum pump 8, wherein the air inlet pipe of the supergravity adsorption bed 1 is connected to the air outlet of the adjustable power heating chamber 2; the hollow tube of the supergravity adsorption bed 1 is connected to the water tank 9. The cooling outer cavity water inlet and the cooling outer cavity water outlet of the cooling outer cavity of the supergravity adsorption bed 1 are respectively connected to the water tank 9, so that the cooling water forms a circulation between the water tank 9 and the cooling outer cavity; the vacuum pump air inlet pipe of the supergravity adsorption bed 1 is connected to the vacuum pump. The air outlet of the mixing chamber 3 is connected to the air inlet of the adjustable power heating chamber 2.

[0093] When the adsorbent gas is air, the air can directly enter the mixing chamber 3 through the air inlet pipe. A first gas regulating valve 11 is provided on the air inlet pipe connected to the air inlet of the mixing chamber 3, and the first gas regulating valve 11 can be used to control whether air is introduced into the adsorption bed.

[0094] When the adsorbent gas is water vapor in the air, water mist is generated by the ultrasonic humidification chamber 4, the gas outlet of the ultrasonic humidification chamber 4 is connected to the gas inlet of the mixing chamber 3, and a second gas regulating valve 12 is provided on the connecting pipeline between the ultrasonic humidification chamber 4 and the mixing chamber 3. Through the second gas regulating valve 12, whether to introduce water mist into the adsorption bed and the flow rate of the introduced water mist can be controlled.

[0095] When the adsorbate gas is a harmful gas or a non-harmful gas other than water vapor in the air, these adsorbate gases are stored in the adsorbate tank 6, and the adsorbate gas is diluted by the gas stored in the carrier gas tank 5, such as nitrogen. Therefore, the adsorbate tank 6 and the carrier gas tank 5 are respectively connected to the air inlet of the mixing chamber 3, and the adsorbate gas in the adsorbate tank 6 and the gas in the carrier gas tank 5 are mixed in the mixing chamber 3, thereby achieving the dilution of the adsorbate gas. In this embodiment, a third gas regulating valve 13 is provided on the connecting pipeline between the adsorbate tank 6 and the mixing chamber 3, and a fourth gas regulating valve 14 is provided on the connecting pipeline between the carrier gas tank 5 and the mixing chamber 3. Through the third gas regulating valve 13 and the fourth gas regulating valve 14, it is possible to control whether the adsorbate gas is introduced into the adsorption bed and the concentration of the adsorbate gas can also be controlled.

[0096] like Figure 7 As shown, the ultrasonic humidifier is provided with an inlet and an outlet, a baffle plate 4.2 is provided inside the ultrasonic humidifier near the inlet, and an ultrasonic generator 4.1 is provided between the baffle plate 4.2 and the outlet. After the air enters the ultrasonic humidifier through the inlet, it flows downward under the blocking effect of the baffle plate 4.2, so that the air is fully humidified by the water mist.

[0097] like Figure 6 As shown, the adjustable power heater includes an adjustable power heating rod 2.1 and several triangular fins 2.2 distributed on the outer side of the adjustable power heating rod 2.1. A gas flow path is formed between the triangular fins 2.2. After the adsorbate gas enters the adjustable power heater, the adjustable power heating rod 2.1 fully heats the adsorbate gas in the process of flowing along the path formed by the triangular fins. By adjusting the heating temperature of the adjustable power heating rod 2.1, the temperature of the heated adsorbate gas can be accurately controlled.

[0098] The water outlet of the water tank 9 and the hollow shaft, and the water inlet of the water tank 9 and the hollow shaft are connected by connecting pipes, a first water valve 21 is provided on the connecting pipe between the water outlet of the water tank 9 and the hollow shaft, and a second water valve 22 is provided on the connecting pipe between the water inlet of the water tank 9 and the hollow shaft. When the first water valve 21 is opened and the second water valve 22 is closed, the cooling water in the water tank 9 can flow into the cooling inner cavity of the adsorption bed along the hollow shaft; when the first water valve 21 is closed and the second water valve 22 is opened, the cooling water in the cooling inner cavity flows into the water tank 9 along the hollow shaft.

[0099] At the same time, the water outlet of the water tank 9 is connected to the water inlet of the cooling outer cavity; the water inlet of the water tank 9 is connected to the water outlet of the cooling outer cavity, and a third water valve 23 is provided on the connecting pipeline. Through the above connection method, the circulation of cooling water between the water tank 9 and the cooling outer cavity is realized. The adsorbent in the adsorption bed is cooled by the cooling water in the cooling outer cavity and the cooling inner cavity, so that the adsorbent is kept at a constant temperature. A water pump 10 is provided at the water outlet of the water tank 9, and during the operation of the water pump 10, the cooling water in the water tank 9 is pumped out.

[0100] When the adsorbent gas is a harmful gas, in order to prevent the harmful gas from polluting the environment, the exhaust pipe of the supergravity adsorption bed 1 is connected to the waste gas storage tank 7, and a fifth gas regulating valve 15 is provided on the connecting pipeline. The gas adsorbed by the adsorbent can enter the waste gas storage tank 7. When the adsorbent gas is a harmless gas, the gas flowing out through the exhaust pipe of the supergravity adsorption bed can be directly discharged into the atmosphere. A sixth gas regulating valve 16 is provided at the exhaust pipe of the supergravity adsorption bed 1.

[0101] When the adsorbent gas is a harmful gas, the fifth gas regulating valve 15 is opened and the sixth gas regulating valve 16 is closed, and the gas discharged from the exhaust pipe of the supergravity adsorption bed flows into the waste gas storage tank 7 for storage; when the adsorbent gas is a non-harmful gas, the fifth gas regulating valve 15 is closed and the sixth gas regulating valve 16 is opened, and the gas discharged from the exhaust pipe of the supergravity adsorption bed can be directly discharged into the atmosphere.

[0102] The vacuum pump outlet of the supergravity adsorption bed 1 is connected to the vacuum pump 8, and a seventh gas regulating valve 17 is provided on the connecting pipeline. The vacuum pump 8 is mainly used for desorption during the supergravity adsorption isotherm measurement. During the desorption of the supergravity adsorption bed, the first gas regulating valve 11 is opened, and the desorbed gas enters the supergravity adsorption bed during the operation of the vacuum pump 8. During the flow from bottom to top, the desorbed gas passes through the adsorbent and takes away the gas adsorbed by the adsorbent, thereby realizing the desorption of the adsorbent and preparing for the next operation of the supergravity adsorption bed.

[0103] The gas generated after desorption will flow out along the vacuum pump inlet pipe 1.10. When the desorbed gas contains harmful gases, it will flow into the exhaust gas storage tank 7 along the connecting pipeline between the vacuum pump 8 and the exhaust gas storage tank 7. An eighth gas regulating valve 19 is provided on the connecting pipeline between the vacuum pump 8 and the exhaust gas storage tank 7. When the desorbed gas does not contain harmful gases, it will flow out along the exhaust port of the vacuum pump 8. A ninth gas regulating valve 20 is provided on the exhaust pipe at the exhaust port of the vacuum pump 8. When the desorbed gas contains harmful gases, the eighth gas regulating valve 19 is opened and the ninth gas regulating valve 20 is closed; when the desorbed gas does not contain harmful gases, the eighth gas regulating valve 19 is closed and the ninth gas regulating valve 20 is opened.

[0104] The present application also discloses a method for isotherm measurement using the above-mentioned supergravity gas-solid adsorption isotherm measurement system, and the method comprises the following steps.

[0105] In the first step, the adsorbate gas is adsorbed through a supergravity adsorption bed.

[0106] At a specific rotation speed, the adsorbate gas at the inlet pipe is adjusted to a certain speed, temperature, pressure and concentration. The adsorbate gas is sucked into the adsorbent for adsorption through the rotation of the rotating blades or the vacuum pump. The adsorbed gas is discharged through the exhaust pipe to achieve standard emissions.

[0107] Open the movable feed cover 1.18, fill the adsorbent into the rotating packed bed 1.16, and then lock the movable feed cover 1.18. Turn on the pump 10, open the first water valve 21, close the second water valve 22 and the second water valve 23, and fill the cooling inner cavity 1.17 and the cooling outer cavity 1.4 of the supergravity adsorption bed with cooling water. Then turn on the speed regulating motor 1.5 to control the speed of the rotating packed bed between 0-1300r / min.

[0108] When the adsorbate gas is harmful, the first gas regulating valve 11 and the second gas regulating valve 12 are closed, and the third gas regulating valve 13 and the fourth gas regulating valve 14 are opened to adjust the relative concentration of the adsorbate gas. At the same time, the sixth gas regulating valve 16 is closed and the fifth gas regulating valve 15 is opened.

[0109] When the adsorbate gas is a harmless gas other than water vapor in the air, the first gas regulating valve 11 and the second gas regulating valve 12 are closed, and the third gas regulating valve 13 and the fourth gas regulating valve 14 are opened to adjust the relative concentration of the adsorbate gas. At the same time, the sixth gas regulating valve 16 is opened and the fifth gas regulating valve 15 is closed.

[0110] When the adsorbent gas is water vapor in the air, the third gas regulating valve 13 and the fourth gas regulating valve 14 are closed, and the first gas regulating valve 11 and the second gas regulating valve 12 are opened. At the same time, the sixth gas regulating valve 16 is closed and the fifth gas regulating valve 15 is opened.

[0111] Turn on the adjustable power heater 2 to control the temperature of the adsorbate gas.

[0112] When the supergravity adsorption bed is used to measure the supergravity gas-solid adsorption isotherm, the speed regulating motor 1.5 is in operation, and the rotating packed bed 1.16 is rotated at a specific speed by controlling the speed of the speed regulating motor 1.5. During the rotation of the rotating packed bed 1.16, the rotating blades 1.25 rotate at the same time. During the rotation of the rotating blades, a pressure difference is formed between the exhaust chamber 1.20 and the air inlet chamber 1.15, which attracts the adsorbate gas to flow from bottom to top along the axial direction of the supergravity adsorption bed. When the adsorbate gas flows into the rotating packed bed 1.16, the adsorbent in the rotating packed bed 1.16 adsorbs the adsorbate gas during the rotation process, thereby realizing supergravity gas-solid adsorption.

[0113] The adsorbed gas enters the exhaust chamber 1.20 and flows out from the exhaust pipe 1.2. When the adsorbed gas is harmful gas, the adsorbed gas flows into the waste gas storage tank 7; when the adsorbed gas is harmless gas, the adsorbed gas can be directly discharged into the atmosphere.

[0114] When the fixed bed gas-solid adsorption isotherm is measured using the supergravity adsorption bed, the speed regulating motor 1.5 does not work, and the speed of the rotating packed bed 1.16 is zero. At this time, the vacuum pump 8 is in operation, and under the adsorption effect of the vacuum pump 8, the adsorbate gas is attracted to flow from bottom to top along the axial direction of the supergravity adsorption bed. When the adsorbate gas flows into the rotating packed bed 1.16, the adsorbent in the rotating packed bed 1.16 in a fixed state adsorbs the adsorbate gas, thereby realizing fixed bed gas-solid adsorption.

[0115] In addition, when the fixed bed gas-solid adsorption isotherm is measured using the supergravity adsorption bed, the fifth gas regulating valve 15 and the sixth gas regulating valve 16 are closed, and the seventh gas regulating valve 17 is opened. When the adsorbate gas is a harmful gas, the eighth gas regulating valve 19 is opened and the ninth gas regulating valve 20 is closed; when the adsorbate gas is a harmless gas, the eighth gas regulating valve 19 is closed and the ninth gas regulating valve 20 is opened.

[0116] The adsorbed gas is discharged through the vacuum pump 8. When the adsorbate gas is a harmful gas, the adsorbed gas flows into the waste gas storage tank 7; when the adsorbate gas is a harmless gas, the adsorbed gas can be directly discharged into the atmosphere.

[0117] S2. Draw the gas-solid adsorption penetration curve and use the dynamic method to solve the equilibrium adsorption amount.

[0118] The ratio of the adsorbate gas concentration at the exhaust pipe to the adsorbate gas concentration at the inlet pipe is recorded in chronological order. When the above concentration ratio reaches 1, the recording is stopped. At this time, the equilibrium adsorption time t e .

[0119] like Figure 8 As shown, when reaching the penetration time point tb Previously, since the adsorbent can adsorb the adsorbate to the maximum extent, almost no adsorbate can leave the adsorption bed smoothly, and the concentration of the adsorbate outlet is close to 0; as time goes by, the adsorbent gradually adsorbs the adsorbate, the adsorption pressure increases, the rate and effect of the adsorbent decrease, the adsorbate can leave the adsorption bed, and the adsorbate gas concentration in the adsorption bed exhaust chamber gradually increases; when the equilibrium adsorption time t is reached, e At this time, the adsorbate gas concentration at the exhaust pipe is equal to the adsorbate gas concentration at the inlet pipe, and the adsorbent has reached the maximum adsorption capacity.

[0120] Using Origin software Figure 8 Integrate the breakthrough curve shown in the figure to obtain the area of ​​region III, that is, the mass of the adsorbate escaping; use the equilibrium adsorption time t e , the total mass of the adsorbate is obtained, that is, the sum of the areas of region I, region II, and region III; the mass of the adsorbate that escapes is subtracted from the total mass of the adsorbate to obtain the mass of the adsorbate that does not escape, that is, the sum of the areas of region I and region II; finally, the equilibrium adsorption amount can be calculated based on the mass of the adsorbent, the flow rate of the adsorbate, and the inlet concentration of the adsorbate. The specific calculation formula is as follows:

[0121]

[0122] Among them, t is time, unit is min; q e is the equilibrium adsorption capacity, in mg / g; C0 is the adsorbate gas concentration at the inlet pipe of the supergravity adsorption bed, in mg / L; C i is the concentration of adsorbate gas at the exhaust pipe of the supergravity adsorption bed, in mg / L; W is the mass of the adsorbent, in g; Q is the volume flow rate of the adsorbate, in L / min; t e It is the time when the concentration of adsorbate gas at the exhaust pipe approaches the concentration of adsorbate gas at the inlet pipe, in minutes.

[0123] The third step is to perform vacuum hot nitrogen purge desorption on the ultra-gravity adsorption bed 1 to prepare for the next adsorption operation of the ultra-gravity adsorption bed.

[0124] Keep the speed of the speed regulating motor 1.5 unchanged, close the first gas regulating valve 11, the second gas regulating valve 12 and the third gas regulating valve 13, and open the fourth gas regulating valve 14; at the same time, close the first water valve 21, open the second water valve 22 and the third water valve 23, and drain the water in the cooling inner cavity 1.17 and the cooling outer cavity 1.4 of the supergravity adsorption bed.

[0125] Close the fifth gas regulating valve 15 and the sixth gas regulating valve 16, open the seventh gas regulating valve 17, and start the vacuum pump 8. If desorbing harmless gas, open the ninth gas regulating valve 20 and close the eighth gas regulating valve 19; if desorbing harmful gas, open the eighth gas regulating valve 19 and close the ninth gas regulating valve 20. Pass in desorbed hot nitrogen, and control the flow rate of desorbed hot nitrogen through the fourth gas regulating valve 14; adjust the temperature of the hot nitrogen used for desorption through the adjustable power heater 2. When the nitrogen concentration at the outlet of the vacuum pump 8 is consistent with the nitrogen concentration at the intake pipe, desorption is completed.

[0126] At this time, turn off the adjustable power heater 2, turn off the fourth gas regulating valve 14, open the first water valve 21 and the third water valve 23, and close the second water valve 22, so that the cooling inner cavity 1.17 and the cooling outer cavity 1.4 of the supergravity adsorption bed are filled with cooling water again, and the supergravity adsorption bed is cooled. When the temperature of the supergravity adsorption bed 1 drops to room temperature, open the second water valve 22, close the first water valve 21, drain the water in the cooling inner cavity, close the second water valve 22 again, open the first water valve 21, and fill the cooling inner cavity with cooling water again. Prepare for the next adsorption work of the supergravity adsorption bed.

[0127] By changing the concentration of the adsorbate gas entering the supergravity adsorption bed and repeating steps one to three, the equilibrium adsorption amount of the supergravity adsorption bed at the same rotation speed and temperature and different adsorbate gas concentrations is obtained, thereby drawing the supergravity gas-solid adsorption isotherm.

[0128] The above method can also be used to draw the isothermal adsorption curve of the fixed bed, and the best supergravity adsorption theoretical model can be obtained by analyzing the fitting degree of various adsorption theoretical models.

[0129] Example 1

[0130] Under isothermal conditions of 30°, the ultra-gravity adsorption isotherm of silica gel was measured by adsorbing water vapor in the air onto silica gel. The specific method steps are as follows.

[0131] First, add reusable silica gel to the rotating packed bed and record the filling weight of silica gel; set the speed of the speed regulating motor to 1000r / min, keep the cooling inner cavity and the cooling outer cavity filled with cooling water, and maintain an isothermal environment for the adsorption process by controlling the temperature of the cooling water.

[0132] Close the fifth gas regulating valve 15 and the seventh gas regulating valve 17, and open the sixth gas regulating valve 16. Close the third gas regulating valve 13 and the fourth gas regulating valve 14, open the first gas regulating valve 11 and the second gas regulating valve 12, and control the air flow rate to 0.005m by controlling the opening and closing degree of the first gas regulating valve 11 and the first gas regulating valve 12. 3 / h and relative humidity is 30%. As the rotating blades rotate with the speed regulating motor, the water vapor entering the adsorption bed flows from bottom to top along the axial direction. When the air flows into the rotating adsorption bed, the silica gel in the rotating adsorption bed adsorbs the water vapor in the air, and the adsorption time and relative humidity data at the outlet pipe are recorded. When the relative humidity at the exhaust pipe is consistent with the relative humidity at the inlet pipe, the adsorption is completed, and the equilibrium adsorption amount is obtained using the adsorption penetration curve.

[0133] Release the cooling water of the cooling inner cavity and the cooling outer cavity, start the vacuum pump 8, close the sixth gas regulating valve 16 and the eighth gas regulating valve 19, open the seventh gas regulating valve 17 and the ninth gas regulating valve 20, close the first gas regulating valve 11, the second gas regulating valve 12 and the third gas regulating valve 13, open the fourth gas regulating valve 14, control the adjustable power heater 2, control the hot nitrogen desorption temperature at 80°, and keep the flow rate unchanged at 0.005m 3 / h, under the action of the vacuum pump, the supergravity adsorption bed is desorbed. When the water vapor concentration at the outlet of the vacuum pump is close to zero, the desorption is completed;

[0134] The cooling water is introduced into the cooling inner cavity and the cooling outer cavity again to cool the supergravity adsorption bed. When the temperature of the supergravity adsorption bed drops to 30°, the water in the cooling inner cavity is discharged, and cooling water is introduced into the cooling inner cavity again to restore the supergravity adsorption bed to its initial state.

[0135] Next, repeat the above steps, and change the relative humidity of the adsorbed air to 50%, 70%, 90%, and 100% while keeping other conditions unchanged, so as to obtain the adsorption isotherm of water vapor in the air adsorbed by silica gel under supergravity.

[0136] Example 2

[0137] The high gravity adsorption isotherm of activated carbon was measured by adsorption of toluene on activated carbon under isothermal conditions of 30°. The specific method steps are as follows.

[0138] First, add reusable activated carbon to the rotating packed bed and record the filling weight; then set the speed of the speed regulating motor to 500r / min, keep the cooling inner cavity and the cooling outer cavity filled with cooling water, so that the adsorption process is carried out in an isothermal environment.

[0139] Since toluene is a harmful gas, in this embodiment, the sixth gas regulating valve 16 and the seventh gas regulating valve 17 need to be closed, and the fifth gas regulating valve 15 needs to be opened. The first gas regulating valve 11 and the second gas regulating valve 12 need to be closed, and the third gas regulating valve 13 and the fourth gas regulating valve 14 need to be opened. By controlling the opening and closing degree of the third gas regulating valve 13 and the fourth gas regulating valve 14, the flow rate of the adsorbent toluene and the carrier gas nitrogen is controlled to be 0.005m 3 / h, and the toluene concentration was 1400 ppm.

[0140] As the rotating blades rotate with the speed regulating motor, the pressure difference generated causes the toluene and carrier gas nitrogen entering the supergravity adsorption bed to move axially from bottom to top. When flowing into the rotating adsorption bed, the adsorbent in the rotating adsorption bed adsorbs the gas, and the adsorption time and toluene concentration data at the outlet pipe are recorded. When the toluene concentration at the exhaust pipe is consistent with the toluene concentration at the inlet pipe, the adsorption is completed, and the adsorption equilibrium is obtained using the adsorption penetration curve.

[0141] Release the cooling water of the cooling inner cavity and the cooling outer cavity, start the vacuum pump 8, close the fifth gas regulating valve 15 and the ninth gas regulating valve 20, open the seventh gas regulating valve 17 and the eighth gas regulating valve 19, close the third gas regulating valve 13, and desorb the supergravity adsorption bed through the nitrogen in the carrier gas tank. Control the adjustable power heater 2 to keep the temperature of the nitrogen at 80°. Control the fourth gas regulating valve 14 to keep the nitrogen flow rate unchanged at 0.005m 3 / h. Under the action of the vacuum pump 8, hot nitrogen flows into the supergravity adsorption bed to desorb the adsorbent therein until the toluene concentration at the outlet of the vacuum pump is close to zero, and the desorption is completed.

[0142] The cooling water is introduced into the cooling inner cavity and the cooling outer cavity again to cool the supergravity adsorption bed. When the temperature of the supergravity adsorption bed drops to 30°, the water in the cooling inner cavity is discharged, and cooling water is introduced into the cooling inner cavity again to restore the supergravity adsorption bed to its initial state.

[0143] Next, repeat the above steps, and change the concentration of adsorbed toluene to 300ppm, 800ppm, 2000ppm, and 2500ppm while keeping other conditions unchanged, and obtain the adsorption isotherm of toluene adsorbed on activated carbon under high gravity.

[0144] Example 3

[0145] Under isothermal conditions of 25°C and vacuum, the adsorption isotherm of activated alumina fixed bed was measured by adsorbing formaldehyde on activated alumina. The specific steps are as follows.

[0146] First, add reusable activated alumina particles into the rotating packed bed, record the filling weight of the activated alumina particles, keep the cooling inner cavity and the cooling outer cavity filled with cooling water, and maintain the adsorption process in an isothermal environment of 25°.

[0147] Start the vacuum pump 8, close the fifth gas regulating valve 15, the sixth gas regulating valve 16 and the ninth gas regulating valve 20, open the seventh gas regulating valve 17 and the eighth gas regulating valve 19, close the first gas regulating valve 11 and the second gas regulating valve 12, open the third gas regulating valve 13 and the fourth gas regulating valve 14, and control the flow rate of the adsorbent formaldehyde and the carrier gas nitrogen to 0.005m by controlling the opening and closing degree of the gas regulating valves 13 and 14. 3 / h, and the formaldehyde concentration was controlled to 800ppm.

[0148] Under the action of concentration difference, the activated alumina particles in the supergravity adsorption bed began to adsorb formaldehyde. The adsorption time and the formaldehyde concentration at the vacuum pump outlet were recorded every 2 minutes until the formaldehyde concentration at the inlet pipe was consistent with the formaldehyde concentration at the vacuum pump inlet. The adsorption was completed. According to the mass of the adsorbent, the flow rate of the adsorbate and the inlet concentration of the adsorbate, the recorded penetration curve was integrated using Origin software to obtain the mass of the adsorbate escaping; the equilibrium adsorption time t was used to calculate the adsorption mass of the adsorbate. e , calculate the total mass of the adsorbate; subtract the mass of the adsorbate that escapes from the total mass of the adsorbate to get the mass of the adsorbate that does not escape; based on the mass of the adsorbate that does not escape, the equilibrium adsorption capacity can be obtained.

[0149] Compared with the experimental data in the literature, the reliability and accuracy of the isotherm measured by the above dynamic method are verified. Repeat the above steps, and change the concentration of adsorbed toluene to 300ppm, 1400ppm, 2000ppm, and 2500ppm respectively under the condition that other conditions remain unchanged, and the isotherm adsorption line of formaldehyde adsorption by fixed bed activated alumina can be obtained.

[0150] During the desorption process of the supergravity adsorption bed, the cooling water in the cooling inner cavity and the cooling outer cavity is released, the vacuum pump 8 is turned on, the fifth gas regulating valve 15, the sixth gas regulating valve 16 and the ninth gas regulating valve 20 are closed, the seventh gas regulating valve 17 and the eighth gas regulating valve 19 are opened, the first gas regulating valve 11, the second gas regulating valve 12 and the third gas regulating valve 13 are closed, and the supergravity adsorption bed is desorbed by the nitrogen in the carrier gas tank. The flow rate of nitrogen is maintained at 0.005m / s through the fourth gas regulating valve 14. 3 / h; the temperature of nitrogen is maintained at 80° by the adjustable power heater 2. Under the action of the vacuum pump 8, the nitrogen desorbs the adsorbent during the flow in the supergravity adsorption bed until the formaldehyde concentration at the outlet of the vacuum pump is close to 0, and the desorption is completed.

[0151] Next, the speed of the speed regulating motor is set to 500 r / min, so that the supergravity adsorption bed repeats the adsorption and desorption process, and the supergravity adsorption isotherm of activated alumina adsorbing formaldehyde at a speed of 500 r / min can be obtained.

[0152] This example can compare the isothermal adsorption line measurements of a fixed bed and a high-gravity bed. By comparing various adsorption theoretical models with experimental data, the best high-gravity adsorption theoretical model can be better obtained.

[0153] The above is a detailed introduction to the supergravity adsorption bed, supergravity gas-solid adsorption isotherm measurement system and method provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present invention. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined in this article can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this article, but will conform to the widest range consistent with the principles and novel features disclosed herein.

Claims

1. A supergravity adsorption bed, characterized in that: It includes a rotating adsorption bed body, a cooling outer cavity and a speed regulating motor, wherein the speed regulating motor is arranged above the rotating adsorption bed body; The main body of the rotating adsorption bed includes, from top to bottom, an exhaust chamber capable of achieving gas communication, a rotating packed bed and an air inlet chamber. A cooling inner cavity is provided at the center of the rotating packed bed, which is connected to a hollow tube. The rotating packed bed is connected to the speed regulating motor through a solid shaft. A cooling outer chamber is arranged on the annular outer side of the rotating packed bed.

2. The supergravity adsorption bed according to claim 1, characterized in that: The main body of the rotary adsorption bed includes a shell, and the shell is provided with an exhaust chamber, a rotary packed bed, and an air inlet chamber from top to bottom. The exhaust chamber is provided with rotary blades, and the rotary blades are fixed on a solid shaft; The shell includes an annular side wall, a top plate and a bottom plate, the speed regulating motor is fixedly arranged on the top plate, and the bottom plate is connected to the adsorption bed support below the top plate; An air inlet pipe and an exhaust pipe of a vacuum pump are arranged at the annular side wall corresponding to the exhaust chamber, an air inlet pipe is arranged at the annular side wall corresponding to the air inlet chamber, the inner walls of the annular side wall of the rotating packing bed are dynamically sealed, a cooling outer cavity is fixed at the outer wall of the shell corresponding to the rotating packing bed, a cooling outer cavity water inlet is arranged at the upper part of the cooling outer cavity, and a cooling outer cavity water outlet is arranged at the lower part of the cooling outer cavity; Mechanical sealing mechanisms are respectively arranged between the solid shaft and the top plate of the shell, and between the hollow shaft and the bottom plate of the shell.

3. The supergravity adsorption bed according to claim 2, characterized in that: The rotating body packing bed comprises an annular outer wall, an annular inner wall, an upper cover plate with holes and a circular bottom plate with holes; The annular adsorbent cavity formed between the annular outer wall and the annular inner wall is filled with an adsorbent, and the annular inner wall forms a cooling inner cavity filled with cooling water; The perforated upper cover plate and the circular perforated bottom plate corresponding to the cooling inner cavity are in the shape of sealed plates, and the perforated upper plate and the circular perforated bottom plate corresponding to the cooling outer cavity are respectively provided with a plurality of ventilation holes at intervals.

4. The supergravity adsorption bed according to claim 3, characterized in that: The rotating packed bed is cylindrical; The perforated upper cover plate is in the shape of a three-quarter circular plate, and the adsorbent is filled into the rotating packed bed through a quarter opening of the perforated upper cover plate; A movable feed cover is sealed above one quarter of the opening of the upper cover with holes, a shaft sleeve is provided in the middle of the movable feed cover, the shaft sleeve is fixed to the solid shaft by bolts, the movable feed cover corresponding to the cooling inner cavity is in the shape of a sealing plate, and the movable feed cover corresponding to the adsorbent cavity is provided with a plurality of vent holes; When the movable feed cover is in a locked state, the movable feed plate is located directly above one quarter of the opening of the upper cover with holes, and is sealedly connected to the upper cover with holes.

5. The supergravity adsorption bed according to claim 2, characterized in that: The mechanical sealing mechanism comprises: The sealing base is sealed and connected to the top plate or the bottom plate of the shell. The sealing base is sleeved on the outside of the solid shaft or the hollow shaft, and the sealing base and the solid shaft or the hollow shaft are rotatably connected through a bearing. The stationary ring, the surface of the sealing base facing away from the shell is provided with a groove, the stationary ring is fixedly arranged in the groove, and a sealing ring is provided between the stationary ring and the bottom of the groove; A dynamic ring is provided on the outer side of the sealing base away from the shell, a sealing ring is provided between the dynamic ring and the solid shaft or the hollow shaft, and the dynamic ring is fixedly connected to the solid shaft or the hollow shaft.

6. A high gravity gas-solid adsorption isotherm measurement system comprising the high gravity adsorption bed according to any one of claims 1 to 5, characterized in that: The air inlet chamber of the supergravity adsorption bed is connected to the adjustable power heating chamber, the air inlet of the adjustable power heating chamber is connected to the mixing chamber, and the air inlet of the mixing chamber is connected in parallel with the carrier gas tank, the adsorbent tank, and the ultrasonic humidifier; The cooling inner cavity and the cooling outer cavity of the supergravity adsorption bed are respectively connected to a water tank, and a pump is provided at the water outlet of the water tank; The exhaust chamber of the supergravity adsorption bed is connected to the vacuum pump and the waste gas storage tank respectively.

7. The high gravity gas-solid adsorption isotherm measurement system according to claim 6, characterized in that: A fourth gas regulating valve is provided on the connecting pipeline between the carrier gas tank and the air inlet of the mixing chamber, a third gas regulating valve is provided on the connecting pipeline between the adsorbent tank and the air inlet of the mixing chamber, a second gas regulating valve is provided on the connecting pipeline between the ultrasonic humidifier and the air inlet of the mixing chamber, and a first gas regulating valve for controlling air entry is provided at the air inlet of the mixing chamber; When the adsorbate gas is a gas other than water vapor in the air, the fourth gas regulating valve and the third gas regulating valve are opened, and the first gas regulating valve and the second gas regulating valve are closed; When the adsorbent is water vapor in the air, the fourth gas regulating valve and the third gas regulating valve are closed, and the first gas regulating valve and the second gas regulating valve are opened to control the moisture content in the air.

8. The high gravity gas-solid adsorption isotherm measurement system according to claim 6, characterized in that: A fifth gas regulating valve is provided on the connecting pipeline between the exhaust pipe of the ultra-gravity adsorption bed and the waste gas storage tank, and a sixth gas regulating valve for directly discharging the adsorbed gas is also provided at the exhaust pipe of the ultra-gravity adsorption bed; A seventh gas regulating valve is provided on the connecting pipeline between the vacuum pump connecting pipe and the vacuum pump, an eighth gas regulating valve is provided on the connecting pipeline between the vacuum pump and the exhaust gas storage tank, and a ninth gas regulating valve is also provided at the outlet of the vacuum pump for directly discharging the adsorbed gas.

9. A method for measuring isotherms using the high gravity gas-solid adsorption isotherm measurement system according to any one of claims 6 to 8, characterized in that: The following steps are involved: S1. The supergravity adsorption bed is set to a specified rotation speed value, and the adsorbate gas entering the air inlet chamber is adjusted to a specified concentration, flow rate and temperature. Under the suction action of the vacuum pump or the rotating blades, the adsorbate gas is sucked into the rotating packed bed, and the adsorbent in the rotating packed bed adsorbs the adsorbate gas, and the adsorbed gas is discharged through the exhaust chamber; S2. Record the ratio of the gas concentration at the exhaust pipe of the exhaust chamber to the adsorbate gas concentration at the intake pipe of the intake chamber according to time, draw a gas-solid adsorption breakthrough curve, and calculate the equilibrium adsorption amount using a dynamic method; S3, using hot desorption gas to vacuum purge and desorb the high-gravity adsorption bed, so that the high-gravity adsorption bed returns to its initial state; S4, repeating steps S1 to S3 to obtain the equilibrium adsorption amount of the supergravity adsorption bed at the same rotation speed and temperature and different adsorbate gas concentrations, and then drawing an isothermal adsorption curve.

10. The method according to claim 9, characterized in that In step S1, cooling water is injected into the cooling inner cavity and the cooling outer cavity; When drawing the high-gravity isothermal adsorption curve, the speed regulating motor drives the high-gravity adsorption bed to rotate, and the speed of the high-gravity adsorption bed is controlled within 1300r / min. At this time: When the adsorbent gas is a harmful gas, the fifth gas regulating valve is opened, the sixth gas regulating valve and the seventh gas regulating valve are closed, and the adsorbed gas is stored in the waste gas storage tank; When the adsorbent gas is harmless gas and water vapor in the air, the sixth gas regulating valve is opened, the fifth gas regulating valve and the seventh gas regulating valve are closed, and the adsorbed gas is directly discharged into the atmosphere; When drawing the fixed bed isothermal adsorption curve, the speed regulating motor does not work, the speed of the supergravity adsorption bed is 0, and the vacuum pump is working. At this time: When the adsorbent gas is a harmful gas, the seventh gas regulating valve and the eighth gas regulating valve are opened, the fifth gas regulating valve, the sixth gas regulating valve and the ninth gas regulating valve are closed, and the adsorbed gas is stored in the waste gas storage tank; When the adsorbent gas is harmless gas and water vapor in the air, the seventh gas regulating valve and the ninth gas regulating valve are opened, the fifth gas regulating valve, the sixth gas regulating valve and the eighth gas regulating valve are closed, and the adsorbed gas is directly discharged into the atmosphere.

11. The method according to claim 9, characterized in that In step S2, the formula for solving the equilibrium adsorption amount using the dynamic method is: Where t is time, unit is min; q e is the equilibrium adsorption capacity, in mg / g; C0 is the adsorbate gas concentration at the inlet pipe of the supergravity adsorption bed, in mg / L; C i is the concentration of adsorbate gas at the exhaust pipe of the supergravity adsorption bed, in mg / L; W is the mass of the adsorbent, in g; Q is the volume flow rate of the adsorbate, in L / min; t e It is the time when the concentration of adsorbate gas at the exhaust pipe approaches the concentration of adsorbate gas at the inlet pipe, in minutes.

12. The method according to claim 9, characterized in that In step S3, the water in the cooling outer cavity and the cooling inner cavity is discharged; the speed of the speed regulating motor remains unchanged, and the vacuum pump works; When the adsorbate gas is a harmless gas, the second gas regulating valve, the first gas regulating valve and the third gas regulating valve are closed, the fourth gas regulating valve is opened to control the flow rate of nitrogen, and the hot nitrogen is purged and desorbed from the adsorbent during the process in which the vacuum pump causes the hot nitrogen to flow axially from bottom to top in the supergravity adsorption bed, the fifth gas regulating valve, the sixth gas regulating valve and the eighth gas regulating valve are closed, and the seventh gas regulating valve and the ninth gas regulating valve are opened; When the adsorbate gas is a harmful gas, the second gas regulating valve, the first gas regulating valve and the third gas regulating valve are closed, the fourth gas regulating valve is opened to control the flow rate of nitrogen, and the hot nitrogen is used to purge and desorb the adsorbent, the fifth gas regulating valve, the sixth gas regulating valve and the ninth gas regulating valve are closed, and the seventh gas regulating valve and the eighth gas regulating valve are opened; When the concentration of adsorbate gas at the outlet of the vacuum pump is zero, desorption is completed; After desorption is completed, cooling water is injected into the cooling outer cavity and the cooling inner cavity to reduce the temperature of the supergravity adsorption bed to room temperature. The water in the cooling outer cavity and the cooling inner cavity is then discharged and cooling water is re-injected to restore the supergravity adsorption bed to its initial state.

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