Moving bed organic waste gas treatment system

Abstract

The utility model belongs to the technical field of organic waste gas treatment, and particularly relates to a moving bed organic waste gas treatment system which comprises a reaction tower body, a desorption area, an adsorption area, an adsorbent distribution area and a clean gas outlet are sequentially arranged in the reaction tower body from bottom to top, and the desorption area is communicated with the adsorbent distribution area through an adsorbent conveying system. According to the utility model, the inclined guide plate is arranged in the adsorption area, so that the contact area is increased when the organic waste gas and the adsorbent can be subjected to countercurrent contact reaction, and the running resistance of the device can be obviously reduced by the flowing adsorbent; the adsorbent is recycled in the system, so that the continuity of the organic waste gas treatment process is ensured, and a plurality of groups of traditional fixed adsorption beds are not required to be switched to realize continuous treatment. Compared with a traditional mode that two or more fixed adsorption beds need to be arranged to guarantee continuous treatment of the organic waste gas, the system has the advantages that the size is effectively reduced, the site can be saved, and the construction and operation cost of enterprises with limited sites is reduced; and the method is relatively simpler, the problems that the system stability is reduced and the requirement on a control system is relatively high due to frequent switching of the adsorption beds are reduced, and maintenance and management are facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of organic waste gas treatment technology, specifically relating to a moving bed organic waste gas treatment system. Background Technology

[0002] In current industrial production and environmental governance, the treatment of organic waste gas has always been a crucial and highly concerned issue. A common method for treating organic waste gas is through adsorption reactions using fixed adsorption beds. In this method, granular activated carbon is typically used as the adsorbent. To ensure sufficient adsorption reaction time, a certain height of activated carbon layer is required. However, this design brings a series of problems.

[0003] First, filling the activated carbon layer to a certain height increases the resistance when organic waste gas passes through. This not only increases the energy consumption of the waste gas treatment system, but may also put pressure on the upstream waste gas emission equipment, and may even affect the stable operation of the entire production system.

[0004] Secondly, in practical engineering applications, to ensure continuous treatment of organic waste gas, it is often necessary to set up two or more sets of fixed adsorption beds. When one set of fixed beds becomes saturated, it enters the desorption stage, at which point the organic waste gas needs to enter other sets of fixed beds to achieve continuous treatment. While this method ensures the continuity of treatment to a certain extent, it also results in a larger overall device size and occupies more space. This undoubtedly increases construction and operating costs for companies with limited space.

[0005] Furthermore, the setup of multiple fixed adsorption beds increases the system's complexity and maintenance difficulty. Switching and coordination between different adsorption beds are necessary, placing high demands on the control system. Frequent switching of adsorption beds can also lead to decreased system stability and affect treatment efficiency.

[0006] In summary, existing organic waste gas treatment devices suffer from problems such as high operating resistance, inability to achieve continuous operation, and large size. These issues not only affect the treatment efficiency and effectiveness of organic waste gas but also increase the costs and burden on enterprises. Therefore, there is an urgent need for a moving bed organic waste gas treatment system to effectively solve the above problems and meet the needs of enterprises for efficient, continuous, and compact organic waste gas treatment devices.

[0007] In view of the above, this utility model is hereby proposed. Utility Model Content

[0008] The purpose of this invention is to overcome the shortcomings of the prior art and provide a moving bed organic waste gas treatment system.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] On the one hand, this utility model provides a moving bed organic waste gas treatment system, including a reaction tower body, wherein a desorption zone, an adsorption zone, an adsorbent distribution zone and a clean gas outlet are arranged sequentially from bottom to top in the reaction tower body, and the desorption zone is connected to the adsorbent distribution zone through an adsorbent conveying system.

[0011] The desorption zone includes an inverted trapezoidal adsorbent aggregation structure. The top of the adsorbent aggregation structure is fixedly connected to the reaction tower body, and the bottom is circumferentially fixed with an open structure that faces downwards and whose distance from the reaction tower body is adjustable. Directly below the open structure is an inverted trapezoidal adsorbent collection structure. The side wall of the adsorbent collection structure is provided with a low-pressure steam inlet. The top of the adsorbent collection structure is fixedly connected to the reaction tower body, and the bottom is connected to the adsorbent delivery system. The side wall of the adsorbent aggregation structure is provided with an organic waste gas inlet.

[0012] The region between the adsorbent aggregation structure and the open structure corresponding to the side wall of the reaction tower is provided with a mixed gas outlet, which is also connected to a mixed gas condensation and separation system that actively extracts the mixed gas.

[0013] Furthermore, the open structure firstly separates the adsorption and desorption zones structurally. Secondly, within the desorption zone, the disturbance of the flow field by low-pressure steam causes some particles to move upwards, which is detrimental to desorption. Structurally, the open structure's blocking effect reduces this adverse effect. From a flow field perspective, as particles move downwards, the cross-sectional area increases and the flow velocity decreases after passing through the open structure, which is beneficial for uniform contact between particles and steam, improving the desorption effect. Thirdly, the annular region formed by the adsorbent aggregation structure, the open structure, and the sidewall of the reaction tower acts as a uniform buffer zone, which helps to reduce the impact of mixed gas extraction on the flow field in the desorption zone, thereby maintaining the relative stability of the flow field in the desorption zone.

[0014] Specifically, an exhaust fan is installed outside the clean gas outlet to create negative pressure in the desorption zone and the adsorbent distribution zone.

[0015] Specifically, the adsorbent distribution area includes multiple layers of folded plates arranged in a staggered manner from top to bottom at the top of the reaction tower. The top of the reaction tower is also provided with an adsorbent inlet. The adsorbent enters the reaction tower from the adsorbent inlet and is evenly distributed on the folded plates to achieve uniform distribution of the adsorbent in the adsorption area.

[0016] Specifically, the adsorption zone includes an upper adsorption zone and a lower adsorption zone. The upper adsorption zone is located between the lower adsorption zone and the adsorbent distribution zone. The lower adsorption zone includes multiple guide plates to increase the contact area between the adsorbent and the organic waste gas. The upper and lower adsorption zones enable counter-current contact reaction between the organic waste gas and the adsorbent. Following the flow direction of the waste gas, in the lower adsorption zone, the adsorbent moves along the guide plates, and on the surface of the guide plates, the organic waste gas reacts with the adsorbent to generate cleaner waste gas. As the airflow rises, in the upper adsorption zone, the cleaner waste gas further undergoes an adsorption reaction with the adsorbent in counter-current contact, generating clean gas that meets emission standards. Due to the presence of the guide plates, the contact area between the organic waste gas and the adsorbent is significantly increased, thereby reducing operating resistance and increasing adsorption efficiency. The ratio of the height of the upper adsorption zone to the thickness of the lower adsorption zone is 1.5–3.

[0017] Furthermore, the guide plate is inclined and has an angle of 30° to 75° with the horizontal plane.

[0018] Specifically, the adsorbent delivery system includes a gas delivery device for lifting the adsorbent to the top of the reaction tower. The adsorbent delivery system adopts a gas lift method, and the lifting gas is pressurized steam or nitrogen gas combined with a Roots blower.

[0019] Specifically, the mixed gas condensation and separation system includes an induced draft fan connected to the mixed gas outlet. The induced draft fan is connected to a storage tank for collecting organic matter and condensate through a heat exchange condenser. The mixed gas of desorbed organic waste gas and hot steam is then physically separated by an open structure. After being condensed by the induced draft fan (which creates negative pressure in the desorption zone) and the heat exchanger, the mixture is recovered in the storage tank.

[0020] Furthermore, the heat exchange condenser includes a heat exchange chamber and a cooling water coil installed inside the heat exchange chamber to increase the cooling area. The cooling water coil has a cooling water inlet at its lowest end and a cooling water outlet at its highest end. The inlet of the heat exchange chamber is connected to the induced draft fan, and the outlet is connected to the storage tank.

[0021] Furthermore, the storage tank is provided with a condensate outlet at the bottom circumferentially and an organic matter outlet at the top circumferentially. Inside the storage tank, and at the organic matter outlet, there is also a baffle plate for raising the water level to facilitate the outflow of organic matter. In the storage tank, organic matter and condensate are separated by gravity and discharged periodically.

[0022] Specifically, the adsorbent is either hard granular activated carbon (hydrophobic) or resin particles. The above materials have high strength and wear resistance and are not easily crushed during repeated cycles.

[0023] Furthermore, this utility model provides an operation method for the moving bed organic waste gas treatment system as described above, as follows:

[0024] After the organic waste gas enters the adsorbent aggregation structure, it passes through the lower adsorption zone, the upper adsorption zone, and the adsorbent distribution zone from bottom to top. After being adsorbed by the adsorbent and meeting the standards, it is discharged from the top clean gas outlet.

[0025] The adsorbent passes through the adsorbent distribution zone, upper adsorption zone, lower adsorption zone, adsorbent aggregation structure, open structure, adsorbent collection structure, and adsorbent conveying system from top to bottom, and then circulates back to the adsorbent distribution zone of the reaction tower.

[0026] In the desorption zone, low-pressure steam is introduced at the adsorbent collection structure to achieve adsorption and regeneration of the adsorbent. The regenerated adsorbent is circulated after passing through the adsorbent conveying system. The mixed gas of desorbed organic waste gas and hot steam passes through the mixed gas outlet and is drawn into the heat exchange condenser by the induced draft fan. The organic matter and condensate are separated after being cooled by the heat exchange condenser. The organic matter and condensate in the storage tank are then separated by gravity and discharged periodically.

[0027] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0028] This invention increases the contact area between the organic waste gas and the adsorbent by setting an inclined guide plate in the adsorption zone, allowing for countercurrent contact and reaction. The flowing adsorbent significantly reduces the operating resistance of the device. By circulating the adsorbent within the system, the continuity of the organic waste gas treatment process is ensured, eliminating the need for multiple sets of fixed adsorption beds for switching, as required by traditional fixed adsorption beds. Compared to the traditional method of requiring two or more sets of fixed adsorption beds for continuous treatment of organic waste gas, this system effectively reduces volume, saves space, and lowers construction and operating costs for companies with limited space. The system structure is also simpler, reducing the instability caused by frequent adsorption bed switching and the high demands on the control system, making maintenance and management easier.

[0029] Furthermore, using hard granular activated carbon or resin particles as adsorbents provides high strength and wear resistance, making them less prone to pulverization during repeated cycles and ensuring long-term stable operation of the system. Attached Figure Description

[0030] The accompanying drawings are incorporated in and form part of this specification, and together with the description, serve to explain the principles of this invention.

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of this utility model.

[0033] Wherein: 1 is the reaction tower body; 2 is the adsorbent distribution zone; 3 is the adsorption zone; 31 is the upper adsorption zone; 32 is the lower adsorption zone; 4 is the desorption zone; 41 is the adsorbent aggregation structure; 42 is the open structure; 43 is the adsorbent collection structure; 44 is the organic waste gas inlet; 45 is the low-pressure steam inlet; 46 is the mixed gas outlet; 5 is the adsorbent conveying system; 6 is the mixed gas condensation and separation system; 61 is the induced draft fan; 62 is the heat exchange condenser; 621 is the cooling water outlet; 622 is the cooling water inlet; 63 is the storage tank; 631 is the organic matter outlet; 632 is the condensate outlet; 7 is the clean gas outlet; 8 is the adsorbent feed inlet. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. The embodiments described below do not represent all embodiments consistent with this invention. Rather, they are merely examples consistent with some aspects of this invention as detailed in the appended claims.

[0035] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] Example 1

[0037] See Figure 1 As shown, this embodiment provides a moving bed organic waste gas treatment system, including a reaction tower 1. The reaction tower 1 is provided with a desorption zone 4, an adsorption zone 3, an adsorbent distribution zone 2 and a clean gas outlet 7 arranged sequentially from bottom to top. The desorption zone 4 is connected to the adsorbent distribution zone 2 through an adsorbent conveying system 5.

[0038] The desorption zone 4 includes an adsorbent gathering structure 41 with an inverted trapezoidal structure. The top of the adsorbent gathering structure 41 is fixedly connected to the reaction tower body 1, and the bottom is circumferentially fixed with an open structure 42 that faces downward and is adjustable in distance from the reaction tower body 1. An adsorbent collection structure 43 with an inverted trapezoidal structure is located directly below the open structure 42. The side wall of the adsorbent collection structure 43 is provided with a low-pressure steam inlet 45. The top of the adsorbent collection structure 43 is fixedly connected to the reaction tower body 1, and the bottom is connected to the adsorbent conveying system 5. The side wall of the adsorbent gathering structure 41 is provided with an organic waste gas inlet 44.

[0039] A mixed gas outlet 46 is provided in the area corresponding to the side wall of the reaction tower body 1 between the adsorbent gathering structure 41 and the open structure 42. The mixed gas outlet 46 is also connected to the mixed gas condensation and separation system 6 that actively extracts the mixed gas.

[0040] Furthermore, the open structure 42 firstly separates the adsorption zone 3 and the desorption zone 4 structurally. Secondly, within the desorption zone 4, the disturbance of the flow field by the low-pressure steam causes some particles to move upwards, which is detrimental to desorption. Structurally, the open structure 42 can reduce this adverse effect by acting as a barrier. From a flow field perspective, when particles move downwards, the cross-sectional area increases and the flow velocity decreases after passing through the open structure 42, which is conducive to uniform contact between particles and steam and improves the desorption effect. Thirdly, the annular region formed by the adsorbent aggregation structure 41, the open structure 42, and the sidewall of the reaction tower 1 is a uniform buffer zone, which helps to reduce the impact of mixed gas extraction on the flow field of the desorption zone 4, thereby maintaining the relative stability of the flow field in the desorption zone 4.

[0041] Specifically, an exhaust fan is provided outside the clean gas outlet 7 to create a negative pressure in the desorption zone 3 and the adsorbent cloth zone 2.

[0042] Specifically, the adsorbent distribution zone 2 includes multiple layers of folded plates arranged in a staggered manner from top to bottom at the top of the reaction tower body 1. The top of the reaction tower body 1 is also provided with an adsorbent inlet 8. The adsorbent enters the reaction tower body 1 from the adsorbent inlet 8 and is evenly distributed on the folded plates to achieve uniform distribution of the adsorbent in the adsorption zone 3.

[0043] Specifically, the adsorption zone 3 includes an upper adsorption zone 31 and a lower adsorption zone 32. The upper adsorption zone 31 is located between the lower adsorption zone 32 and the adsorbent distribution zone 2. The lower adsorption zone 32 includes multiple guide plates to increase the contact area between the adsorbent and the organic waste gas. The upper and lower adsorption zones 32 achieve countercurrent contact reaction between the organic waste gas and the adsorbent. Following the flow direction of the waste gas, in the lower adsorption zone 32, the adsorbent moves along the guide plates, and on the surface of the guide plates, the organic waste gas reacts with the adsorbent to generate cleaner waste gas. As the airflow rises, in the upper adsorption zone 31, the cleaner waste gas further undergoes an adsorption reaction with the adsorbent in countercurrent contact, generating clean gas that meets emission standards. Due to the presence of the guide plates, the contact area between the organic waste gas and the adsorbent is significantly increased, thereby reducing operating resistance and achieving higher adsorption efficiency.

[0044] Furthermore, the guide plate is inclined and has an angle of 30° to 75° with the horizontal plane.

[0045] Specifically, the adsorbent delivery system 5 includes a gas delivery device for lifting the adsorbent to the top of the reaction tower 1. The adsorbent delivery system 5 adopts a gas lift method, and the lifting gas is pressurized steam or nitrogen gas combined with a Roots blower.

[0046] Specifically, the mixed gas condensation and separation system 6 includes an induced draft fan 61 connected to the mixed gas outlet 46. The induced draft fan 61 is connected to a storage tank 63 for collecting organic matter and condensate through a heat exchange condenser 62. The mixed gas of desorbed organic waste gas and hot steam is physically separated by the open structure 42, and then condensed by the induced draft fan (which creates negative pressure in the desorption zone 4) and the heat exchanger, and the mixture is recovered in the storage tank.

[0047] Furthermore, the heat exchange condenser 62 includes a heat exchange chamber and a cooling water coil installed inside the heat exchange chamber to increase the cooling area. The cooling water coil has a cooling water inlet 622 at its lowest end and a cooling water outlet 621 at its highest end. The inlet of the heat exchange chamber is connected to the induced draft fan 61, and the outlet is connected to the storage tank 63.

[0048] Furthermore, the storage tank 63 is provided with a condensate outlet 632 at the bottom circumferentially and an organic matter outlet 631 at the top circumferentially. Inside the storage tank 63 and at the organic matter outlet 631, there is also a baffle plate for raising the water level to facilitate the outflow of organic matter. In the storage tank, organic matter and condensate are separated by gravity and discharged periodically.

[0049] Specifically, the adsorbent is either hard granular activated carbon (hydrophobic) or resin particles. The above materials have high strength and wear resistance and are not easily crushed during repeated cycles.

[0050] Specifically, the negative pressure formed by the adsorption zone 3 and the adsorbent cloth zone 2 is balanced with the negative pressure formed by the desorption zone 4, so that the induced draft fan 61 will not draw organic waste gas from the adsorption zone 31 to the mixed gas condensation and separation system 6, and the exhaust fan at the clean gas outlet 7 will not draw the mixed gas of desorbed organic waste gas and hot steam to the adsorption zone 3.

[0051] This embodiment provides an operation method for the moving bed organic waste gas treatment system described above, as follows:

[0052] After the organic waste gas enters the adsorbent aggregation structure 41, it passes through the lower adsorption zone 32, the upper adsorption zone 31, and the adsorbent distribution zone 2 from bottom to top. After being adsorbed by the adsorbent and meeting the standards, it is discharged from the top clean gas outlet 7.

[0053] The adsorbent passes through the adsorbent distribution zone 1, upper adsorption zone 31, lower adsorption zone 32, adsorbent aggregation structure 41, open structure 42, adsorbent collection structure 43, and adsorbent conveying system 5 from top to bottom, and then circulates back to the adsorbent distribution zone 2 of the reaction tower body 1.

[0054] In the desorption zone 4, low-pressure steam is introduced into the adsorbent collection structure 43 to achieve adsorption and regeneration of the adsorbent. The regenerated adsorbent is circulated after passing through the adsorbent conveying system 5. The mixed gas of desorbed organic waste gas and hot steam passes through the mixed gas outlet 46 and enters the heat exchange condenser 62 by the induced draft fan 61. The organic matter and condensate are separated after being cooled by the heat exchange condenser 62. The organic matter and condensate in the storage tank 63 are then separated by gravity and discharged periodically.

[0055] At the clean gas outlet 7, due to the suction effect of the rear exhaust fan and the chimney, the negative pressure is about -200 to -400 Pa. The pressure values ​​of the contact area between the bottom of the adsorption zone 3 and the top of the desorption zone 4 are similar, both being negative pressures of about -100 to -50 Pa. The annular area formed between the adsorbent aggregation structure 41, the open structure 42, and the side wall of the reaction tower body 1 has a negative pressure of about -100 to -150 Pa due to the action of the induced draft fan 61.

[0056] Example 2

[0057] The difference between this embodiment and Embodiment 1 is that the guide plate can be replaced with a guide pipe.

[0058] The above description is merely a specific embodiment of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model.

[0059] It should be understood that this utility model is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A moving bed organic waste gas treatment system, characterized in that, The reaction tower includes a reaction tower body (1), which is provided with a desorption zone (4), an adsorption zone (3), an adsorbent distribution zone (2) and a clean gas outlet (7) from bottom to top. The desorption zone (4) is connected to the adsorbent distribution zone (2) through an adsorbent delivery system (5). The desorption zone (4) includes an adsorbent gathering structure (41) with an inverted trapezoidal structure. The top of the adsorbent gathering structure (41) is fixedly connected to the reaction tower body (1), and the bottom is circumferentially fixed with an open structure (42) that faces downward and is adjustable in distance from the reaction tower body (1). The open structure (42) is located directly below the open structure (42) with an adsorbent collection structure (43) with an inverted trapezoidal structure. The side wall of the adsorbent collection structure (43) is provided with a low-pressure steam inlet (45). The top of the adsorbent collection structure (43) is fixedly connected to the reaction tower body (1), and the bottom is connected to the adsorbent delivery system (5). The side wall of the adsorbent gathering structure (41) is provided with an organic waste gas inlet (44). The region between the adsorbent aggregation structure (41) and the open structure (42) corresponding to the side wall of the reaction tower body (1) is provided with a mixed gas outlet (46), which is also connected to a mixed gas condensation and separation system (6) that actively extracts mixed gas.

2. The moving bed organic waste gas treatment system according to claim 1, characterized in that, The adsorbent distribution area (2) includes multiple layers of folded plates arranged at the top of the reaction tower (1) and staggered from top to bottom. The top of the reaction tower (1) is also provided with an adsorbent inlet (8). The adsorbent enters the reaction tower (1) from the adsorbent inlet (8) and is evenly distributed on the folded plates to achieve uniform distribution of the adsorbent in the adsorption area (3).

3. The moving bed organic waste gas treatment system according to claim 1, characterized in that, The adsorption zone (3) includes an upper adsorption zone (31) and a lower adsorption zone (32). The upper adsorption zone (31) is located between the lower adsorption zone (32) and the adsorbent distribution zone (2). The lower adsorption zone (32) includes multiple guide plates for increasing the contact area between the adsorbent and the organic waste gas.

4. The moving bed organic waste gas treatment system according to claim 3, characterized in that, The guide vane is inclined and has an angle of 30° to 75° with the horizontal plane.

5. The moving bed organic waste gas treatment system according to claim 1, characterized in that, The adsorbent delivery system (5) includes a gas delivery device for lifting the adsorbent to the top of the reaction tower (1).

6. The moving bed organic waste gas treatment system according to claim 1, characterized in that, The mixed gas condensation and separation system (6) includes an induced draft fan (61) connected to the mixed gas outlet (46), and the induced draft fan (61) is connected to a storage tank (63) for collecting organic matter and condensate through a heat exchange condenser (62).

7. The moving bed organic waste gas treatment system according to claim 6, characterized in that, The heat exchange condenser (62) includes a heat exchange chamber and a cooling water coil installed inside the heat exchange chamber to increase the cooling area. The cooling water coil has a cooling water inlet (622) at its lowest end and a cooling water outlet (621) at its highest end. The inlet of the heat exchange chamber is connected to the induced draft fan (61), and the outlet is connected to the storage tank (63).

8. The moving bed organic waste gas treatment system according to claim 6, characterized in that, The storage tank (63) has a condensate outlet (632) at the bottom circumferentially and an organic matter outlet (631) at the top circumferentially. Inside the storage tank (63) and at the organic matter outlet (631), there is also a baffle plate for raising the water level to facilitate the outflow of organic matter.

9. The moving bed organic waste gas treatment system according to claim 1, characterized in that, The adsorbent is either hard granular activated carbon or resin granules.

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