Adsorption regenerating device and exhaust gas treatment method
By separating the desorption zone and the cooling zone, the problem of condensation of low-concentration VOCs waste gas is solved, achieving more efficient waste gas treatment and energy consumption optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QINGDAO HUASHIJIE ENVIRONMENT TECHNOLOGY CO LTD
- Filing Date
- 2024-12-17
- Publication Date
- 2026-06-26
AI Technical Summary
In existing technologies, low-concentration VOCs are prone to condensation during desorption, leading to rotor blockage and performance degradation. Furthermore, components that are difficult to detect are hard to avoid, and existing methods are either ineffective or cumbersome.
The desorption zone is divided into two adjacent and independent desorption zones, and the cooling zone is divided into two parts. Low-temperature and low-concentration exhaust gases and high-temperature and high-concentration exhaust gases are treated in series to avoid mixing and condensation and optimize air volume and temperature distribution.
It effectively reduces the impact of easily condensable substances at the desorption outlet, reduces equipment investment and operating energy consumption, and improves the performance and processing efficiency of the rotor.
Smart Images
Figure CN122273246A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of waste gas treatment technology, and more specifically, to an adsorption regeneration device and a waste gas treatment method. Background Technology
[0002] Adsorption-concentration rotors for large-volume, low-concentration VOCs are widely used both domestically and internationally. They adsorb at ambient temperature and then transfer to the desorption zone, where they are desorbed under hot air purging at around 200°C, completing the adsorption-desorption cycle.
[0003] In actual working conditions, VOCs exhaust gas often contains some components with low volatility that are not easy to desorb. Even if they can be desorbed from the rotor under desorption conditions, they will condense at the desorption outlet and form an oil film on the rotor surface. This oil film easily adheres to dust, clogs the channels, increases the rotor's running resistance, reduces the rotor's performance, and in severe cases, may even cause the rotor to smolder.
[0004] Because these components that are not easily desorbed are present in low concentrations, are difficult to detect, and are hard to prevent from entering the rotor, they are generally mitigated by increasing the desorption and regeneration temperatures. However, this approach has limitations in terms of effectiveness or is cumbersome to implement.
[0005] Therefore, how to provide an adsorption regeneration device and waste gas treatment method that reduces the impact of easily condensable substances at the desorption outlet on the performance of the rotor by changing the equipment structure based on the existing desorption regeneration process has become a technical problem that urgently needs to be solved in this field. Summary of the Invention
[0006] The purpose of this invention is to provide an adsorption regeneration device and a waste gas treatment method that can reduce the impact of easily condensable substances at the desorption outlet on the performance of the rotor.
[0007] The first aspect of the present invention provides an adsorption regeneration device, including a rotor, the rotor including an adsorption zone, a desorption zone and a cooling zone arranged sequentially along the circumference of the rotor; the regeneration device also includes a heating device; the desorption zone includes an adjacent and independent desorption zone one and a desorption zone two; the cooling zone includes a hot side and a cold side opposite to each other; the inlet side of the adsorption zone is connected to an exhaust gas duct, and the outlet side of the adsorption zone is connected to the cold side; or, the exhaust gas duct is connected to the cold side and the inlet side of the adsorption zone respectively through two parallel exhaust gas branches, and the outlet side of the adsorption zone is connected to the atmosphere; the hot side is connected to the inlet side of the heating device, and the outlet side of the heating device is connected to the inlet side of the desorption zone one and the inlet side of the desorption zone two respectively through two parallel gas ducts; the outlet side of the desorption zone two is connected to a downstream processing device, and the outlet side of the desorption zone one is connected to the inlet of the heating device.
[0008] Optionally, the cooling zone includes an adjacent and independent cooling zone one and a cooling zone two. Cooling zone one includes a first cold side and a first hot side, and cooling zone two includes a second cold side and a second hot side.
[0009] When the outlet side of the adsorption zone is connected to the cold side, the outlet side of the adsorption zone is connected to the first cold side, the first hot side is connected to the second cold side, and the second hot side is connected to the inlet side of the heating device.
[0010] Alternatively, when the exhaust gas duct is connected to the cold side and the intake side of the adsorption zone respectively through two parallel exhaust gas branches, and the exhaust side of the adsorption zone is connected to the atmosphere, one exhaust gas branch is connected to the first cold side, the first hot side is connected to the second cold side, and the second hot side is connected to the intake side of the heating equipment.
[0011] Optionally, a heat insulation layer is provided between the cooling zone and the desorption zone.
[0012] Optionally, the angle of the sector containing the desorption zone is between 10° and 60°.
[0013] Optionally, the angle of the sector containing the desorption zone is 10° to 50°.
[0014] Optionally, the angle of the sector containing the first desorption zone is 5° to 30°, and / or the angle of the sector containing the second desorption zone is 5° to 30°.
[0015] Optionally, the angle of the sector containing the cooling zone is between 5° and 60°.
[0016] Optionally, the angle of the sector containing the cooling zone is 10° to 50°.
[0017] Optionally, the angle of the sector containing cooling zone one is 5° to 30°, and / or the angle of the sector containing cooling zone two is 5° to 30°.
[0018] A second aspect of the present invention provides a method for treating waste gas, the method using the adsorption and regeneration device of any one of the first aspects of the present invention, the method comprising:
[0019] When the inlet side of the adsorption zone is connected to the exhaust gas duct and the outlet side of the adsorption zone is connected to the cold side: a portion of the exhaust gas after adsorption enters the rotor from the cold side, and then exits the rotor from the hot side and enters the heating equipment. The exhaust gas that has reached the desorption temperature enters the rotor from the inlet of the desorption zone. A portion of the exhaust gas leaves the rotor from the outlet side of the first desorption zone and returns to the heating equipment via the circulating fan. Another portion of the exhaust gas leaves the rotor from the outlet side of the second desorption zone and enters the downstream treatment equipment. The remaining portion of the exhaust gas after adsorption is directly discharged into the atmosphere after being adsorbed in the adsorption zone.
[0020] Alternatively, when the exhaust gas duct is connected to the cold side and the inlet side of the adsorption zone through two parallel exhaust gas branches, and the outlet side of the adsorption zone is connected to the atmosphere: part of the exhaust gas to be treated is directly discharged to the atmosphere after being adsorbed by the adsorption zone, and the other part of the exhaust gas to be treated directly enters the rotor from the cold side, and then exits the rotor from the hot side and enters the heating equipment. After reaching the desorption temperature, the exhaust gas enters the rotor from the inlet of the desorption zone. Part of the exhaust gas leaves the rotor from the outlet side of the first desorption zone and returns to the heating equipment via the circulating fan, while the other part of the exhaust gas leaves the rotor from the outlet side of the second desorption zone and enters the downstream treatment equipment.
[0021] According to the technical content disclosed in this invention, the following beneficial effects are achieved:
[0022] The adsorption-regeneration device provided by this invention divides the desorption zone into two adjacent and independent desorption zones: a first desorption zone and a second desorption zone. This separates low-temperature, low-concentration waste gas from high-temperature, high-concentration waste gas, preventing the condensation of non-volatile substances. Specifically, since the heating of the rotor in the desorption zone is a slow process, the air temperature and VOC concentration at the desorption outlet are low in the pre-desorption stage, and very high in the post-desorption stage. In existing implementations, these two waste gases are mixed and enter the downstream treatment equipment together. Therefore, the mixed air temperature and VOC concentration are also low, making it easy for non-desorbable substances to condense, leading to the aforementioned problems. The solution of this invention avoids the mixing of these two waste gases. The low-temperature, low-concentration waste gas in the pre-desorption stage is recycled and used for desorption again, while the high-temperature, high-concentration waste gas in the post-desorption stage enters the downstream treatment equipment, further reducing the investment and operating energy consumption of the downstream treatment equipment.
[0023] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description
[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.
[0025] Figure 1 This is a schematic diagram of the rotary wheel structure of the present invention.
[0026] Figure 2 This is a schematic diagram of an adsorption regeneration device according to an embodiment of the present invention.
[0027] Figure 3 This is a schematic diagram of another adsorption regeneration device according to an embodiment of the present invention. Detailed Implementation
[0028] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the invention.
[0029] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.
[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.
[0031] In all the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0032] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.
[0033] The rotor in the existing implementation scheme is generally divided into an adsorption zone, a desorption zone, and a cooling zone. The desorption zone and the cooling zone have (partially) independent cavities. The exhaust gas enters the rotor from the inlet of the adsorption zone and leaves the rotor from the outlet of the adsorption zone. A portion of the exhaust gas (air) enters the rotor from the inlet of the cooling zone and leaves the rotor from the outlet of the cooling zone. Then it enters the heater (heat exchanger). After reaching the desorption temperature, it enters the rotor from the inlet of the desorption zone and leaves the rotor from the outlet of the desorption zone.
[0034] The present invention also divides the rotor into an adsorption zone, a desorption zone, and a cooling zone. Unlike the prior art, the desorption zone and the cooling zone are each further divided into two areas, referred to as Desorption Zone 1, Desorption Zone 2, Cooling Zone 2, and Cooling Zone 1 according to the order in which the rotor enters. The angle of the sector containing the desorption zone is 10° to 60°, preferably 10° to 50°. If the angle of the desorption zone is too small, the resistance is large; if the angle of the desorption zone is too large, the proportion of the adsorption zone is small. The angle of the sector containing Desorption Zone 1 is 5° to 30°, and the angle of the sector containing Desorption Zone 2 is 5° to 30°. If the angle of Desorption Zone 1 is too small (the angle of Desorption Zone 2 is too large), condensation will occur. If the angle of Desorption Zone 1 is too large (the angle of Desorption Zone 2 is too small), the amount of air participating in the circulation is too large, the air intake of the cooling zone is insufficient, and the cooling effect is poor.
[0035] The angle of the sector containing the cooling zone is 5° to 60°, preferably 10° to 50°. If the angle of the cooling zone is too small, the cooling air resistance will be large; if the angle of the cooling zone is too large, the adsorption zone ratio will be small. The angle of the sector containing cooling zone one is 5° to 30°, and the angle of the sector containing cooling zone two is 5° to 30°. If the angle of cooling zone two is too large (the angle of cooling zone one is too small), the temperature on the hot side of the cooling air will be low, and the effect of preventing desorption air condensation will be insignificant. If the angle of cooling zone one is too large (the angle of cooling zone two is too small), the cooling air resistance will be large.
[0036] The situation in the adsorption zone is the same as in the existing implementation scheme. A portion of the exhaust gas (air) enters the rotor from the inlet of cooling zone 1 (cold side) and leaves the rotor from the outlet of cooling zone 1. Then it enters the rotor from the inlet of cooling zone 2 and leaves the rotor from the outlet of cooling zone 2 (hot side). Then it enters the heater (heat exchanger). After reaching the desorption temperature, it enters the rotor from the inlet of the desorption zone. A portion of the exhaust gas leaves the rotor from the outlet of desorption zone 1 and returns to the heater (heat exchanger) via the circulating fan. The other portion of the exhaust gas leaves the rotor from the outlet of desorption zone 2 and enters the downstream treatment equipment.
[0037] Because the heating process of the rotor in the desorption zone is slow, the air temperature and VOC concentration are low at the desorption outlet in the pre-desorption stage, and very high in the post-desorption stage. In the existing implementation scheme, the two exhaust gases are mixed and then enter the back-end treatment equipment together. Therefore, the temperature and VOC concentration of the mixed air are also low. Substances that are not easy to desorb are prone to condensation under these conditions, resulting in the aforementioned problems. The solution of the present invention can avoid the mixing of the two exhaust gases. The low-temperature, low-concentration exhaust gas in the pre-desorption stage is recycled and used for desorption again, while the high-temperature, high-concentration exhaust gas in the post-desorption stage enters the back-end treatment equipment, further reducing the investment and operating energy consumption of the back-end treatment equipment.
[0038] Specifically, the adsorption regeneration device of the present invention includes three structures: Example 1, Example 2, and Example 3.
[0039] Example 1:
[0040] See Figure 1 and Figure 2This embodiment discloses an adsorption regeneration device, including a rotor, which includes an adsorption zone, a desorption zone, and a cooling zone arranged sequentially along the circumference of the rotor; the regeneration device also includes a heating device; the desorption zone includes an adjacent and independent desorption zone one and a desorption zone two; the cooling zone includes an adjacent and independent cooling zone one and a cooling zone two, the cooling zone one including a first cold side and a first hot side, and the cooling zone two including a second cold side and a second hot side; the inlet side of the adsorption zone is connected to an exhaust gas duct, and the outlet side of the adsorption zone is connected to the cold side, the outlet side of the adsorption zone including two outlet channels, one of which... One exhaust channel connects to the atmosphere to directly discharge the adsorbed waste gas. Another exhaust channel connects to the first cold side. After being treated in the first cooling zone, the waste gas passes through the first hot side and connects to the second cold side to enter the second cooling zone. After being treated in the second cooling zone, the waste gas passes through the second hot side and is transported to the inlet side of the heating equipment. The exhaust side of the heating equipment is connected to the inlet side of the first desorption zone and the inlet side of the second desorption zone through two parallel air channels. The exhaust side of the second desorption zone is connected to the downstream processing equipment, and the exhaust side of the first desorption zone is connected to the inlet of the heating equipment for recycling.
[0041] Example 2:
[0042] See Figure 1 and Figure 3 This embodiment discloses an adsorption regeneration device, including a rotor, which comprises an adsorption zone, a desorption zone, and a cooling zone arranged sequentially along the circumference of the rotor; the regeneration device also includes a heating device; the desorption zone includes an adjacent and independent desorption zone one and a desorption zone two; the cooling zone includes an adjacent and independent cooling zone one and a cooling zone two, the cooling zone one including a first cold side and a first hot side, and the cooling zone two including a second cold side and a second hot side; the exhaust gas duct includes two parallel exhaust gas branches, one of which connects to the inlet side of the adsorption zone. The exhaust side of the adsorption zone is connected to the atmosphere, and another exhaust gas branch is connected to the first cold side. After being treated in the first cooling zone, the exhaust gas is connected to the second cold side through the first hot side and enters the second cooling zone. After being treated in the second cooling zone, the exhaust gas is connected to the second hot side and transported to the inlet side of the heating equipment. The exhaust side of the heating equipment is connected to the inlet side of the first desorption zone and the inlet side of the second desorption zone through two parallel gas channels. The exhaust side of the second desorption zone is connected to the downstream processing equipment, and the exhaust side of the first desorption zone is connected to the inlet of the heating equipment for recycling.
[0043] Example 3:
[0044] The adsorption regeneration device in this embodiment differs from those in Embodiments 1 and 2 in that: the cooling zone is not divided into partitions, but only one independent cooling zone is retained. The cooling zone includes a hot side and a cold side, and a heat insulation layer is provided between the cooling zone and the desorption zone.
[0045] The present invention also provides a method for treating waste gas.
[0046] When using the adsorption regeneration device in Example 1, the method includes:
[0047] When the inlet side of the adsorption zone is connected to the exhaust gas duct and the outlet side of the adsorption zone is connected to the cold side: part of the exhaust gas after adsorption enters the rotor from the cold side, and then exits the rotor from the hot side and enters the heating equipment. The exhaust gas after reaching the desorption temperature enters the rotor from the inlet of the desorption zone. Part of the exhaust gas leaves the rotor from the outlet side of the first desorption zone and returns to the heating equipment via the circulating fan. Another part of the exhaust gas leaves the rotor from the outlet side of the second desorption zone and enters the downstream treatment equipment. The other part of the exhaust gas after adsorption is directly discharged into the atmosphere after adsorption in the adsorption zone.
[0048] When using the adsorption regeneration device in Example 2, the method includes:
[0049] When the exhaust gas duct is connected to the cold side and the inlet side of the adsorption zone through two parallel exhaust gas branches, and the outlet side of the adsorption zone is connected to the atmosphere: part of the exhaust gas to be treated is directly discharged to the atmosphere after being adsorbed by the adsorption zone, and the other part of the exhaust gas to be treated directly enters the rotor from the cold side, and then exits the rotor from the hot side and enters the heating equipment. After reaching the desorption temperature, the exhaust gas enters the rotor from the inlet of the desorption zone. Part of the exhaust gas leaves the rotor from the outlet side of the first desorption zone and returns to the heating equipment through the circulating fan, while the other part of the exhaust gas leaves the rotor from the outlet side of the second desorption zone and enters the downstream treatment equipment.
[0050] Comparative Example
[0051] When using the impeller of the existing implementation scheme: cooling inlet temperature 30°C, cooling outlet temperature 100°C, cooling airflow 5000 Nm 3 / h, desorption inlet 200℃, desorption outlet 60℃, desorption air volume 5000Nm 3 / h, inlet back-end processing air volume 5000Nm 3 / h, concentration 2g / Nm 3 ; Specific Implementation
[0053] When using the adsorption regeneration devices of Examples 1 and 2: cooling inlet temperature 30°C, cooling zone 1 outlet temperature 95°C, cooling zone 2 outlet temperature 170°C, cooling airflow 2500 Nm³ / h, desorption inlet temperature 200°C, desorption zone 1 outlet temperature 45°C, desorption zone 2 outlet temperature 100°C, desorption airflow 5000 Nm³ / h. 3 / h, inlet back-end processing air volume 2500Nm 3 / h, concentration 4g / Nm 3 ;
[0054] As can be seen, based on the adsorption regeneration devices of Examples 1 and 2, since part of the desorbed air is circulating, the proportion of air entering the desorption zone from the cooling zone decreases. The present invention sets the cooling zone into two sections, with the air entering and exiting in series. The hot side is close to the desorption zone, and the cold side is close to the adsorption zone, which can further reduce the condensation caused by the drop in the desorption outlet temperature. The air temperature at the cooling outlet will also be higher, further reducing the investment and operating energy consumption of the desorption heating.
[0055] In summary, the key technical features of the adsorption regeneration device provided by this invention are that the desorption zone is divided into two parts to separate low-temperature, low-concentration waste gas from high-temperature, high-concentration waste gas, thus avoiding the condensation of non-volatile substances; the cooling zone is divided into two parts with inlet and outlet connected in series, and the air volume is matched with the air volume of the desorption zone, resulting in a higher cooling outlet temperature.
[0056] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims
1. An adsorption-regeneration device, comprising a rotating wheel, the rotating wheel including an adsorption zone, a desorption zone, and a cooling zone arranged sequentially along the circumference of the rotating wheel, characterized in that: The regeneration device also includes a heating device; The desorption zone includes two adjacent and independent desorption zone 1 and desorption zone 2; The cooling zone includes a hot side and a cold side; The inlet side of the adsorption zone is connected to the exhaust gas duct, and the outlet side of the adsorption zone is connected to the cold side; or, the exhaust gas duct is connected to the cold side and the inlet side of the adsorption zone respectively through two parallel exhaust gas branches, and the outlet side of the adsorption zone is connected to the atmosphere. The hot side is connected to the air inlet side of the heating device, and the air outlet side of the heating device is connected to the air inlet side of the desorption zone one and the air inlet side of the desorption zone two through two parallel air passages respectively. The outlet side of the second desorption zone is connected to the back-end processing equipment, and the outlet side of the first desorption zone is connected to the inlet of the heating equipment.
2. The adsorption regeneration device according to claim 1, characterized in that: The cooling zone includes an adjacent and independent cooling zone one and a cooling zone two. The cooling zone one includes a first cold side and a first hot side, and the cooling zone two includes a second cold side and a second hot side. When the outlet side of the adsorption zone is connected to the cold side, the outlet side of the adsorption zone is connected to the first cold side, the first hot side is connected to the second cold side, and the second hot side is connected to the inlet side of the heating device. Alternatively, when the exhaust gas duct is connected to the cold side and the air inlet side of the adsorption zone respectively through two parallel exhaust gas branches, and the air outlet side of the adsorption zone is connected to the atmosphere, one exhaust gas branch is connected to the first cold side, the first hot side is connected to the second cold side, and the second hot side is connected to the air inlet side of the heating device.
3. The adsorption regeneration device according to claim 1 or 2, characterized in that: A heat insulation layer is provided between the cooling zone and the desorption zone.
4. The adsorption regeneration device according to claim 1 or 2, characterized in that: The angle of the sector containing the desorption zone is between 10° and 60°.
5. The adsorption regeneration device according to claim 4, characterized in that: The angle of the sector containing the desorption zone is between 10° and 50°.
6. The adsorption regeneration device according to claim 4, characterized in that: The angle of the sector containing the first desorption zone is 5° to 30°, and / or the angle of the sector containing the second desorption zone is 5° to 30°.
7. The adsorption regeneration device according to claim 2, characterized in that: The angle of the sector containing the cooling zone is between 5° and 60°.
8. The adsorption regeneration device according to claim 7, characterized in that: The angle of the sector containing the cooling zone is between 10° and 50°.
9. The adsorption regeneration device according to claim 7, characterized in that: The angle of the sector where the first cooling zone is located is 5° to 30°, and / or the angle of the sector where the second cooling zone is located is 5° to 30°.
10. An exhaust gas treatment method characterized by, The method uses the adsorption regeneration apparatus according to any one of claims 1 to 9, and the method comprises: When the inlet side of the adsorption zone is connected to the exhaust gas duct and the outlet side of the adsorption zone is connected to the cold side: a portion of the exhaust gas adsorbed by the adsorption zone enters the rotor from the cold side, then exits the rotor from the hot side and enters the heating equipment; the exhaust gas that reaches the desorption temperature enters the rotor from the inlet of the desorption zone; a portion of the exhaust gas leaves the rotor from the outlet side of the first desorption zone and returns to the heating equipment via the circulating fan; another portion of the exhaust gas leaves the rotor from the outlet side of the second desorption zone and enters the downstream processing equipment; the remaining portion of the exhaust gas adsorbed by the adsorption zone is directly discharged into the atmosphere after adsorption by the adsorption zone. Alternatively, when the exhaust gas duct is connected to the cold side and the inlet side of the adsorption zone respectively through two parallel exhaust gas branches, and the outlet side of the adsorption zone is connected to the atmosphere: part of the exhaust gas to be treated is directly discharged to the atmosphere after being adsorbed by the adsorption zone, and another part of the exhaust gas to be treated directly enters the rotor from the cold side, and then exits the rotor from the hot side and enters the heating equipment. After reaching the desorption temperature, the exhaust gas enters the rotor from the inlet of the desorption zone. Part of the exhaust gas leaves the rotor from the outlet side of the first desorption zone and returns to the heating equipment via the circulating fan, while the other part of the exhaust gas leaves the rotor from the outlet side of the second desorption zone and enters the downstream processing equipment.