Zeolite rotating wheel adsorption device for laboratory

Abstract

The invention relates to a gas adsorption separation device, in particular to a zeolite rotating wheel adsorption device for a laboratory. The zeolite rotating wheel adsorption device for the laboratory is used for improving the adsorption efficiency and the cooling effect of a zeolite rotating wheel, improving the action efficiency of a cooling mechanism and saving cooling gas, and has good economic benefits. According to the technical scheme, the zeolite rotating wheel adsorption device for the laboratory comprises a rotating wheel base body used for adsorbing organic matters in waste gas; the driving mechanism is used for driving the rotating wheel base body to rotate around the horizontal axis; the regeneration mechanism is used for inputting hot air through a hot air input pipeline to increase the temperature of the rotating wheel base body so as to desorb the organic matters adsorbed on the rotating wheel base body; the device is characterized by further comprising a cooling mechanism which is arranged at the bottom of the rotating wheel base body and used for cooling the cooling liquid in the rotating wheel base body through heat conduction.

Description

Technical Field

[0001] The invention relates to a gas adsorption separation device, in particular to a zeolite wheel adsorption device for laboratory use. Background Art

[0002] VOCs (volatile organic compounds) are a class of organic compounds that are easily volatile at room temperature. They are one of the main by-products of chemical experiments and are very harmful to human health and the environment. Not only do they have a special unpleasant odor, they are also toxic, irritating and carcinogenic. Long-term exposure to high concentrations of VOCs may cause symptoms such as headaches and dizziness, threatening the lives of laboratory personnel. In addition, VOCs are important precursors to the formation of fine particulate matter (PM2.5) and ozone (O3), which have serious impacts on the atmospheric environment and human health.

[0003] The zeolite wheel is a highly efficient device for gas separation and purification, mainly used to remove volatile organic compounds (VOCs) and other harmful substances in air or exhaust gas. It uses the high adsorption performance of zeolite attached to the wheel matrix and the rotation mechanism of the wheel to achieve a continuous adsorption and desorption process. Since the adsorption process of the zeolite rotor is actually an exothermic process, this phenomenon is called exothermic adsorption in adsorption science. In the current zeolite rotor system, the regeneration area (i.e., the desorption area) needs to separate the organic waste gas through hot air, and then treat it after generating high-concentration organic waste gas. The heated zeolite rotor greatly reduces the adsorption capacity of the zeolite itself. In order to ensure the excellent adsorption capacity of the zeolite rotor, the adsorption area of ​​the zeolite rotor is cooled by introducing cold air. The cold air is continuously introduced to cool the cooling area, and the gas consumption is relatively large. On the other hand, affected by the adsorption and desorption capacity of the zeolite rotor, the current rotation speed of the zeolite rotor is one to six revolutions per hour. The traditional cooling area needs to avoid the working area of ​​the zeolite rotor. Therefore, after the zeolite rotor is cooled, it will quickly return to room temperature in a non-working state, and cannot effectively maintain the cooling effect to ensure the improvement of the adsorption efficiency. In addition, the setting of the traditional cooling area also reduces the area of ​​the regeneration area, increases the pressure of desorbing organic waste gas in the regeneration area, and does not have good economic benefits. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a laboratory zeolite wheel adsorption device for improving the adsorption efficiency and cooling effect of the zeolite wheel, improving the efficiency of the cooling mechanism, saving cooling gas, and having good economic benefits.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] A laboratory zeolite wheel adsorption device, comprising:

[0007] The rotor base is used to absorb organic matter in the exhaust gas; the front end face of the rotor base corresponds to the hot air input pipe and the exhaust gas input pipe arranged vertically, and the rear end face corresponds to the concentrated exhaust gas output pipe and the clean gas outlet arranged vertically;

[0008] A driving mechanism, used for driving the rotating wheel base to rotate around a horizontal axis;

[0009] A regeneration mechanism, which inputs hot air through a hot air input pipe to increase the temperature of the rotor substrate so as to desorb organic matter adsorbed on the rotor substrate;

[0010] It is characterized in that: the device also includes:

[0011] A cooling mechanism is disposed at the bottom of the rotor base and is used to cool the coolant in the rotor base through heat conduction;

[0012] The rotor base is disc-shaped and consists of a plurality of hollow grooves distributed in a grid pattern and a plurality of connecting grooves arranged at intervals from the plurality of hollow grooves; the plurality of hollow grooves are arranged parallel to each other and pass through the two end faces of the rotor base, and a zeolite layer for adsorbing organic matter is applied on the groove wall surface of the hollow groove; the plurality of connecting grooves are made one by one in the groove wall between any two adjacent hollow grooves and are connected to each other to form a closed space for filling the coolant.

[0013] The rotating wheel base is fixed in the annular positioning bracket, and the annular positioning bracket is rotatably positioned on the frame through an annular supporting outer frame; the driving mechanism drives the annular positioning bracket to rotate through a belt transmission.

[0014] The cooling mechanism comprises a closed cooling box filled with coolant, the upper surface of the cooling box is slidably fitted with the circumferential lower surface of the annular positioning bracket to absorb the heat of the coolant in the wheel base into the coolant in the cooling box through heat conduction.

[0015] The rotor base is composed of a plurality of pairs of sector-shaped blocks spliced ​​together in the circumferential direction; each pair of sector-shaped blocks is formed by the rear end surfaces of the two sector-shaped blocks correspondingly matching each other, so that the hollow grooves on each pair of sector-shaped blocks all penetrate the front and rear end surfaces, and the connecting grooves therein form an independent sealed cavity.

[0016] A plurality of connecting openings are made on the planar outer walls on both sides of each of the sector-shaped blocks, and the connecting grooves in the sector-shaped blocks are connected with the connecting grooves in the adjacent sector-shaped blocks through the connecting openings, so that all the connecting grooves in the rotor base can be connected after several pairs of sector-shaped blocks are spliced.

[0017] The cooling source of the cooling mechanism is a semiconductor cooling sheet, and the cooling surface of the semiconductor cooling sheet is arranged in contact with the bottom of the cooling box.

[0018] The semiconductor refrigeration sheet is installed in a heating box below the cooling box, and a heat sink is provided on the heating surface of the semiconductor refrigeration sheet; ventilation holes are provided on both sides of the heating box, and the ventilation holes are guided to the regeneration area above the rotor base through a pipe equipped with a fan, thereby providing the heat required for regeneration and realizing the desorption of organic gas.

[0019] The cooling liquid occupies at least half of the space in the inner cavity of the communicating groove, so that the liquid surface of the cooling liquid is located near the axis of the disc-shaped rotating wheel base when it is stationary.

[0020] The connecting grooves between any two adjacent hollow grooves are connected to each other in the circumferential direction of the rotating wheel base.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention provides a connecting groove inside the rotor base and injects coolant to efficiently cool the zeolite in the working area. As the rotor base rotates, the coolant can always be in the working area at the lower position due to the action of gravity, and the cold air introduction area is omitted. On the one hand, the gas consumption is saved, and on the other hand, the cooling effect is not easily wasted naturally with the change of time. The zeolite can be maintained at a lower temperature to adsorb the organic waste gas, and has excellent adsorption efficiency;

[0023] 2. The cooling source of the present invention adopts a semiconductor cooling sheet, whose cooling surface can be used to cool the coolant, and the hot air generated by the heating surface can be used to desorb the organic matter adsorbed by the zeolite, which greatly reduces the power consumption required by the equipment and is conducive to improving the economic benefits of the equipment under long-term use;

[0024] 3. The present invention heats the upper half of the rotor base through hot air generated by the semiconductor refrigeration sheet, thereby avoiding the problem of low desorption efficiency caused by overcooling of the equipment and improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention.

[0026] Figure 2 It is a partial schematic diagram of the structure of an embodiment of the present invention (the hot air input duct and the exhaust gas input duct installed at the front are omitted).

[0027] Figure 3 It is a right view structural schematic diagram of an embodiment of the present invention.

[0028] Figure 4 yes Figure 3 AA section view.

[0029] Figure 5 yes Figure 3Schematic diagram of the enlarged structure of part B in FIG.

[0030] Figure 6 yes Figure 3 Enlarged view of the D part of the structure.

[0031] Figure 7 It is one of the three-dimensional structure enlarged views (front side structure view) of the fan-shaped block in the embodiment of the present invention.

[0032] Figure 8 This is the second enlarged view of the three-dimensional structure of the fan-shaped block in the embodiment of the present invention (rear side structure view).

[0033] Fig. 9 yes Figure 8 Schematic diagram of the enlarged structure of part C in.

[0034] Fig.10 It is a schematic diagram of the matching relationship between the rotor base and the cooling box in an embodiment of the present invention.

[0035] Fig.11 It is a three-dimensional structural schematic diagram of the driving mechanism in an embodiment of the present invention.

[0036] Fig.12 yes Fig.11 Schematic diagram of the enlarged structure of part E in FIG.

[0037] Fig.13 It is a schematic diagram of the connection relationship between the annular supporting outer frame and the frame in an embodiment of the present invention.

[0038] Figure numerals: 1, wheel base; 101, fan-shaped block; 102, connecting port; 2, frame; 3, annular support outer frame; 4, annular positioning bracket; 5, driving mechanism; 6, cooling box; 7, heating box; 8, semiconductor refrigeration plate; 9, heat sink; 10, limiter; 11, exhaust gas input pipe; 12, hot air input pipe; 13, hollow groove; 14, connecting groove; rotating shaft 15. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0040] The zeolite wheel adsorption device for laboratory use provided by the present invention is used to improve the adsorption efficiency and cooling effect of the zeolite wheel, which is beneficial to improving the efficiency of the cooling mechanism and saving cooling gas, and has good economic benefits. In order to realize the structural function of the device, the device includes a wheel base 1, the wheel base is disc-shaped, and the front side end face of the wheel base corresponds to the exhaust gas input pipe 11 and the hot air input pipe 12 arranged up and down; it is also equipped with a driving mechanism for driving the wheel base; these are similar to the existing zeolite wheel adsorption device.

[0041] The improvements of the present invention are:

[0042] The rotor base is provided with a plurality of hollow grooves 13 distributed in a mesh pattern. These hollow grooves are arranged parallel to each other and penetrate through the two side end surfaces of the rotor base. A zeolite layer is applied on the groove wall surface of the hollow groove to adsorb and concentrate the organic waste gas.

[0043] The rotor base 1 is also provided with a connecting groove 14, and a plurality of connecting grooves are made one by one in the groove wall between two adjacent (including upper and lower adjacent and left and right adjacent) hollow grooves and are connected to each other and sealed and isolated from the outside; the connecting groove is also filled with a coolant, and the liquid level of the coolant is in the middle position of the disc when it is stationary; thereby, the heat exchange strength of the rotor base 1 is increased in the form of a coolant, thereby increasing the exhaust gas adsorption capacity of the zeolite. The driving mechanism 5 is used to drive the rotor base to rotate. When the zeolite rotor is cooled by the built-in coolant, there is no need to equip additional cooling areas outside the non-working area; that is, the zeolite rotor only includes a regeneration area located in the upper half of the zeolite rotor and a working area located in the lower half of the zeolite rotor, wherein the cooling area and the working area are highly overlapped, and there is no need to make the cooling area avoid the working area setting, so as to achieve efficient refrigeration and improve the adsorption efficiency of organic matter. The cooling mechanism is arranged at the bottom of the rotor base 1, and its function is to cool the coolant inside the rotor base by heat conduction; the coolant can be kept distributed in the working area by gravity (that is, the working area is located below the coolant) to cool the zeolite layer laid in the working area. The regeneration mechanism is used to increase the temperature of the rotor base above the coolant so that the organic waste gas adsorbed by the zeolite layer can be desorbed from the rotor base. Through the arrangement of the above mechanism, the low temperature input of the coolant by the cooling mechanism will continue to act on the lower half of the rotor base 1, and will not cause a high low temperature loss over time. Therefore, there is no need to introduce cooling gas to quickly cool the working area, and it can maintain a temperature lower than normal temperature in the working state, thereby improving the overall adsorption performance of the zeolite rotor. In addition, there is no need to prepare additional cooling areas outside the working area, and the area of ​​the desorption area is also increased, that is, the adsorption area and the desorption area can efficiently realize the work process, which is beneficial to improving the overall working capacity of the zeolite wheel. It can have a higher adsorption capacity when the zeolite area is certain, that is, the zeolite wheel speed can be increased under different environments, which is also beneficial to reduce the overall volume of the zeolite wheel, and has good economic benefits.

[0044] The zeolite wheel adsorption device for laboratory use provided in an embodiment of the present invention specifically provides a connection structure for rotating a zeolite wheel; specifically, the device also includes a frame 2, on which an annular support outer frame 3 is provided, and an annular positioning bracket 4 is rotatably provided inside the annular support outer frame, and a wheel base 1 is coaxially fixedly arranged in the annular positioning bracket and rotatably positioned on the frame through a horizontally arranged rotating shaft 15; a driving mechanism 5 is used to drive the annular positioning bracket 4 to rotate, preferably by a belt drive (a driving motor is fixed on the frame, and a belt is tensioned between the driving motor shaft and the outer circumferential surface of the annular positioning bracket; as shown in FIG. Fig.12 As shown). Considering the need to cool the coolant in the rotor base, it is preferred that the bottom of the annular support outer frame 3 is open, the cooling box 6 included in the cooling mechanism is a closed box structure, the upper surface of the cooling box is an arc surface suitable for the annular positioning bracket and is slidably fitted on the lower surface of the annular positioning bracket 4; the cooling box is filled with coolant, and the coolant in the cooling box 6 is used to absorb the heat of the coolant in the rotor base 1 through heat conduction; through the above method, the coolant in the cooling box can be directly cooled, so that the low temperature is transferred to the arc-shaped metal surface on the cooling box, and the metal surface is in contact with the lower surface of the annular positioning bracket 4, and finally the cooling of the coolant in the rotor base is realized; with regard to the selection of coolant, it is preferred to select propylene glycol or ethylene glycol solution, whose freezing point is above minus thirty degrees and has good low-temperature control performance.

[0045] In a laboratory zeolite wheel adsorption device provided by an embodiment of the present invention, the wheel base has a small aperture for ventilation on its surface. Therefore, in order to increase the actual effective area of ​​zeolite, only the thickness of the wheel base 1 and the number of gaps can be increased. For such a small gap structure, in order to facilitate the processing of the hollow grooves inside, the wheel base 1 can be optimized and designed, and the material of the wheel base is preferably aluminum alloy. Specifically, the wheel base 1 can be configured to be composed of a plurality of sector-shaped blocks 101 spliced ​​in an annular manner, such as Figure 7 As shown, the three closed sides of the sector-shaped block are two rectangular planes and an arc surface of the outer circumference, and the hollow groove 13 completely penetrates the two end surfaces of the sector-shaped block ( Figure 4The front side is the end face of the rotor base body facing the exhaust gas input pipe side), and the connecting grooves 14 are processed accordingly in the two adjacent hollow groove walls (ie, the corresponding connecting ribs) to form a liquid flow area. The hollow grooves of these fan-shaped blocks (the width of the hollow grooves is preferably 0.1-5mm) can be cast, and the connecting grooves (the width of the connecting grooves is preferably 3-5mm) can be processed by a machining center after the casting operation is completed; because the tool axis when the machining center makes the connecting grooves is perpendicular to the end face of the fan-shaped block, it can only ensure that the connecting grooves are closed at the front end face of the fan-shaped block (the tool does not penetrate the end face), and the connecting groove openings that pass through the rear end face (the process openings for the tool to enter and exit during processing) need to be closed; preferably, a mirror setting can be used to make the rear end faces of the two fan-shaped blocks match each other to form a pair of fan-shaped blocks, so that the hollow grooves are connected and pass through the two end faces of the pair of fan-shaped blocks (the two side end faces perpendicular to the axial direction of the wheel base), and the connecting groove openings are closed to form an independently closed cavity; in order to improve the sealing performance, bonding glue can be first applied on the corresponding matching surfaces to prevent leakage. In order to ensure that the coolant is located below each sector block under the action of gravity, a plurality of connecting openings 102 are provided on the outer walls of the two side planes of each sector block to connect with other adjacent sector blocks, such as Figure 7 shown.

[0046] The splicing method of the fan-shaped block group is as follows Fig.10 As shown, each sector block group is connected by two sector blocks, and the six sector block groups are installed in a circular array; in order to improve the installation accuracy, the annular positioning bracket can be used for accurate sealing design, and the connecting grooves can be connected with adhesive glue to achieve sealing, etc. The specific sealing means will not be elaborated here. Regarding the laying of the zeolite layer, the zeolite material can be coated on the inside of the ventilation mesh in the form of a suspension (it can also be immersed in a zeolite suspension to achieve the combination of the substrate surface adhesive and the zeolite), and the specifics will not be elaborated here.

[0047] A zeolite wheel adsorption device for laboratory use provided by an embodiment of the present invention takes into account that when a low-temperature coolant cools a wheel base 1, it will have a certain impact on the heat recovery of the regeneration area, which is easy to reduce the desorption efficiency of the regeneration area and increase the heat consumption of the equipment; therefore, in order to improve the utilization rate of the cooling mechanism, the cooling source of the cooling mechanism is set as a semiconductor refrigeration sheet 8, and the refrigeration surface of the semiconductor refrigeration sheet is set to fit the bottom of the cooling box 6; when the semiconductor refrigeration sheet is working, the heating efficiency of its heating surface is greater than one, so this embodiment uses the self-heating of the semiconductor refrigeration sheet to neutralize the temperature of the regeneration area of ​​the zeolite wheel, so as to achieve efficient utilization of the semiconductor refrigeration sheet; specifically, the semiconductor refrigeration sheet 8 is installed in the heating box 7 and the heating box is fitted under the cooling box through a bracket connected to the frame, the heating surface of the semiconductor refrigeration sheet is provided with a plurality of heat sinks 9, and vents are provided on both sides of the heating box 7, and the airflow direction of the vents can pass through the gaps between the plurality of heat sinks, and the hot air blown out through the vents is guided to the regeneration area above the wheel base 1 through a hot air input pipe equipped with a fan. Through this arrangement, the hot air generated by the semiconductor refrigeration plate 8 can flow back to the upper area for desorption of organic matter, and can achieve efficient cooling and heating processes under low power consumption, with excellent economic benefits.

[0048] A zeolite wheel adsorption device for laboratory use provided by an embodiment of the present invention can directly direct the heat source blown out of the vent to the vent of the wheel base 1, or merge with the hot air used for desorption, or directly reheat the hot air until the required desorption temperature is reached, so as to reduce the power requirement of the regeneration heater.

[0049] The working principle of the present invention is: when the zeolite wheel rotates slowly during operation, the organic waste gas enters the adsorption area below the axis of the wheel base, that is, it enters the hollow groove from the waste gas input pipe at the lower part of the front end face of the wheel base, and the organic matter therein is adsorbed by the zeolite layer, and the remaining clean gas passes through the hollow groove and is discharged from the clean gas outlet at the lower part of the rear end face of the wheel base; the cooling box continuously absorbs the heat of the coolant in the wheel base 1 through the annular positioning bracket, thereby ensuring the adsorption efficiency of the zeolite layer. The hollow groove adsorbing the organic matter rotates to the desorption area above the axis of the wheel base as the wheel base rotates, and the desorption hot air input from the outside enters the hollow groove from the hot air input pipe at the upper part of the front end face of the wheel base, so that the adsorbed organic matter evaporates from the zeolite layer, and then is output from the concentrated waste gas output pipe at the upper part of the rear end face of the wheel base for incineration or recovery; the hot air output by the heating box can be merged with the desorption hot air, or the desorption hot air can be heated for a second time to improve the desorption efficiency.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A laboratory zeolite wheel adsorption device, comprising: The rotor base (1) is used to absorb organic matter in the exhaust gas; the front end surface of the rotor base corresponds to the hot air input pipe (12) and the exhaust gas input pipe (11) arranged vertically, and the rear end surface corresponds to the concentrated exhaust gas output pipe and the clean gas outlet arranged vertically; A driving mechanism (5) for driving the rotating wheel base (1) to rotate around a horizontal axis; A regeneration mechanism, which inputs hot air through a hot air input pipe to increase the temperature of the rotor substrate (1) so as to desorb organic matter adsorbed on the rotor substrate; The device is characterized in that: the device further comprises: a cooling mechanism, which is arranged at the bottom of the rotor base and is used to cool the coolant inside the rotor base through heat conduction; The rotor base is disc-shaped and consists of a plurality of hollow grooves (13) distributed in a mesh shape and a plurality of connecting grooves (14) arranged at intervals from the plurality of hollow grooves; the plurality of hollow grooves are arranged parallel to each other and penetrate through two end faces of the rotor base, and a zeolite layer for adsorbing organic matter is applied on the groove wall surface of the hollow grooves; the plurality of connecting grooves are made one by one in the groove wall between two adjacent hollow grooves and are connected to each other to form a closed space filled with cooling liquid.

2. The laboratory zeolite wheel adsorption device according to claim 1, characterized in that: The rotating wheel base (1) is fixed in an annular positioning bracket (4), and the annular positioning bracket is rotatably positioned on the frame through an annular supporting outer frame (3); the driving mechanism drives the annular positioning bracket to rotate through a belt transmission.

3. The laboratory zeolite wheel adsorption device according to claim 2, characterized in that: The cooling mechanism comprises a closed cooling box (6) filled with cooling liquid, wherein the upper surface of the cooling box is slidably fitted with the circumferential lower surface of the annular positioning bracket (4) so ​​as to absorb the heat of the cooling liquid in the wheel base into the cooling liquid in the cooling box through heat conduction.

4. The laboratory zeolite wheel adsorption device according to claim 3, characterized in that: The rotor base is composed of a plurality of pairs of sector-shaped blocks spliced ​​together in the circumferential direction; each pair of sector-shaped blocks is formed by the rear end surfaces of two sector-shaped blocks (101) correspondingly matching each other, so that the hollow grooves on each pair of sector-shaped blocks all penetrate the front and rear end surfaces, and the connecting grooves therein form an independent sealed cavity.

5. The laboratory zeolite wheel adsorption device according to claim 4, characterized in that: A plurality of communication openings (103) are formed on the planar outer walls on both sides of each of the sector-shaped blocks, and the communication grooves in the sector-shaped blocks are connected with the communication grooves in the adjacent sector-shaped blocks through the communication openings, so that all the communication grooves in the rotor base can be connected after a plurality of pairs of sector-shaped blocks are spliced.

6. The laboratory zeolite wheel adsorption device according to claim 5, characterized in that: The cooling source of the cooling mechanism is a semiconductor cooling sheet (8), and the cooling surface of the semiconductor cooling sheet is arranged in contact with the bottom of the cooling box (6).

7. The laboratory zeolite wheel adsorption device according to claim 6, characterized in that: The semiconductor refrigeration sheet (8) is installed in a heating box (7) below the cooling box. The heating surface of the semiconductor refrigeration sheet is provided with a heat sink (9). Ventilation holes are provided on both sides of the heating box. The vents are guided to the regeneration area above the rotor base (1) through a pipeline equipped with a fan, thereby providing the heat required for regeneration and achieving desorption of organic gas.

8. The laboratory zeolite wheel adsorption device according to claim 7, characterized in that: The cooling liquid occupies at least half of the space in the inner cavity of the communicating groove, so that the liquid surface of the cooling liquid is located near the axis of the disc-shaped rotating wheel base when it is stationary.

9. The laboratory zeolite wheel adsorption device according to claim 8, characterized in that: The connecting grooves between any two adjacent hollow grooves are connected to each other in the circumferential direction of the rotating wheel base.

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