Glycine drying tail gas treatment device
By combining pulse bag dust collector and granular carbon adsorption device, the problems of incomplete recovery of small particulate materials and poor methanol absorption in glycine production were solved, achieving efficient material recovery and exhaust gas treatment, and reducing energy consumption and environmental pollution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CANGZHOU HUACHEN BIOTECH CO LTD
- Filing Date
- 2025-07-18
- Publication Date
- 2026-06-23
Smart Images
Figure CN224388328U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of glycine production technology, and in particular relates to a glycine drying tail gas treatment device. Background Technology
[0002] With increasing environmental pressure, the requirements for exhaust gas absorption systems in the glycine production sector are constantly rising, especially regarding the particulate matter and methanol content in the exhaust gas from glycine production workshops. Currently, the product drying process uses a blower to blow materials to the roof via a heat exchanger, where the materials are recovered by a cyclone separator, and the exhaust gas is discharged through a spray absorption tower. However, in the glycine production process, dust particles are widely distributed and a mixture of coarse and fine particles. The cyclone separator can only recover large particles, not small ones. Most of the small particles enter the drying spray tower, increasing the risk of blockage in the drying discharge pipeline. The exhaust gas is absorbed by the spray tower before being discharged, resulting in excessive dust absorption and incomplete recovery of glycine particulate matter, increasing material loss costs. Furthermore, the current absorption effect on methanol in the exhaust gas after passing through the spray tower is poor.
[0003] Therefore, there is an urgent need for a glycine drying tail gas treatment device that can efficiently recover materials and absorb methanol in the tail gas. Utility Model Content
[0004] In view of this, in order to solve the problems that existing technologies cannot recover small particulate materials and have poor absorption effect on methanol in the exhaust gas after the spray tower, this utility model proposes a glycine drying exhaust gas treatment device.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A glycine drying exhaust gas treatment device, comprising:
[0007] Pulse jet baghouse dust collectors are used to separate gas from particulate matter and recover particulate matter.
[0008] The spray tower's inlet is connected to the outlet of the pulse bag filter.
[0009] The particulate carbon adsorption device includes a demister, a dryer heater, and a particulate carbon adsorber. The outlet of the spray tower, the demister, the dryer heater, and the particulate carbon adsorber are connected in sequence. The outlet of the particulate carbon adsorber is connected to the main exhaust stack. The particulate carbon adsorber can adsorb methanol in the gas.
[0010] As a preferred embodiment of the above-mentioned glycine drying tail gas treatment device, there are two granular carbon adsorbers, the inlets of both granular carbon adsorbers are connected to the outlet of the drying heater, and the outlets of both granular carbon adsorbers are connected to the main exhaust stack.
[0011] As a preferred embodiment of the above-mentioned glycine drying tail gas treatment device, the granular carbon adsorber contains multiple layers of activated carbon arranged sequentially.
[0012] As a preferred embodiment of the above-mentioned glycine drying tail gas treatment device, the pulse bag dust collector includes a housing, a pulse-jet cleaning system, filter bags, filter cages, and a dust hopper. The housing includes an upper housing and a lower housing. The upper housing is a clean gas chamber and has the air outlet. The filter bags and filter cages are located in the lower housing. The filter bags are fitted onto the filter cages, and the inside of the filter bags communicates with the clean gas chamber. The dust hopper is fixedly installed below the lower housing and communicates with the lower housing. The pulse-jet cleaning system is located above the filter bags and filter cages and can intermittently fill the filter bags with air.
[0013] As a preferred embodiment of the above-mentioned glycine drying tail gas treatment device, the pulse-jet system includes multiple pulse valves, multiple nozzles and an air source system. The multiple pulse valves and multiple nozzles are arranged in a one-to-one correspondence. The two ends of the pulse valves are respectively connected to the nozzles and the air source system. The nozzles are located above the filter bags and filter cages.
[0014] As a preferred embodiment of the above-mentioned glycine drying tail gas treatment device, the ash hopper is conical.
[0015] As a preferred embodiment of the above-mentioned glycine drying tail gas treatment device, an ash discharge valve is provided at the bottom of the ash hopper.
[0016] As a preferred embodiment of the above-mentioned glycine drying tail gas treatment device, the filter cage is cylindrical.
[0017] As a preferred embodiment of the above-mentioned glycine drying tail gas treatment device, the filter cage has a plurality of through holes spaced apart on its side wall.
[0018] As a preferred embodiment of the above-mentioned glycine drying tail gas treatment device, the filter bag is made of coated polyester needle-punched felt material.
[0019] Compared with the prior art, the beneficial effects of the glycine drying tail gas treatment device provided by this utility model are:
[0020] 1. This utility model provides a glycine drying tail gas treatment device. In this device, the tail gas after passing through the spray tower is pre-treated by a demister to remove large-diameter water mist, acid mist, and other droplets. Then, it passes through a drying heater to reduce gas humidity, and finally through a granular carbon adsorber to remove methanol, ensuring that the final exhaust gas emissions meet environmental emission standards. The demister pre-treats water mist and acid mist, protecting the pore structure of activated carbon, effectively removing droplets ≥3μm from the exhaust gas, reducing competitive adsorption between water and methanol, preventing system failures, and preventing droplets carrying corrosive substances (such as acid mist) from damaging the carbon bed support structure. It reduces regeneration energy consumption; dry carbon regeneration saves 30-40% more energy than wet carbon regeneration. The drying heater reduces exhaust gas humidity and heats the gas to ensure uniform distribution of combustible gases, avoiding local concentration exceeding limits. It is suitable for low-temperature environments in northern winters, and preheating to 40℃ prevents activated carbon condensation. The granular carbon adsorber significantly improves adsorption efficiency by constructing adsorption layers in layers and effectively avoids airflow short-circuiting, thereby further optimizing adsorption performance.
[0021] 2. This utility model provides a glycine drying tail gas treatment device. The device comprises two granular carbon adsorbers: a first granular carbon adsorber and a second granular carbon adsorber. These two adsorbers work alternately. When the first granular carbon adsorber is adsorbing, the second granular carbon adsorber is desorbing and regenerating. After the first granular carbon adsorber completes its adsorption cycle, the process switches to the second granular carbon adsorber adsorbing while the first granular carbon adsorber desorbs and regenerates. This arrangement ensures that the inside of the granular carbon adsorber remains dry during adsorption.
[0022] 3. This utility model provides a glycine drying tail gas treatment device. In this device, the pulse bag filter dust collector consists of three layers: an upper chamber, a lower chamber, and a dust hopper. The structure is rationally designed with clear functional zoning. The modular design facilitates maintenance and saves costs. The upper chamber is a clean gas chamber for collecting and purifying the gas. The lower chamber features an optimized airflow distribution design, ensuring that the dust-laden gas passes evenly through the filter bags, improving filtration efficiency. The conical design of the dust hopper facilitates natural dust discharge, reducing the risk of accumulation.
[0023] 4. This utility model provides a glycine drying tail gas treatment device. In this device, the pulse bag filter is equipped with a jet cleaning device to enable the filter bags to regenerate. Through pulse jet cleaning, a high-pressure pulsed airflow instantly impacts the filter bags, causing the dust layer to quickly fall off and restoring filtration capacity. The Venturi effect enhances airflow diffusion, resulting in more uniform dust removal, avoiding localized clogging, and also features a high degree of automation, supporting remote control and intelligent adjustment. Attached Figure Description
[0024] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:
[0025] Figure 1 This is a schematic diagram of the granular carbon adsorption device of the glycine drying tail gas treatment device provided in a specific embodiment of this utility model;
[0026] Figure 2 This is a schematic diagram of the pulse bag dust collector of the glycine drying tail gas treatment device provided in a specific embodiment of this utility model;
[0027] Figure 3 This is a schematic diagram of the filter cage of the pulse bag dust collector in the glycine drying tail gas treatment device provided in a specific embodiment of this utility model.
[0028] In the picture:
[0029] 1. Spray tower; 2. Demister; 3. Dryer heater; 4. Granular carbon adsorber; 5. Detection port; 6. Main exhaust stack; 7. Upper chamber; 8. Lower chamber; 9. Ash hopper; 10. Pulse jet system; 11. Ash discharge valve; 12. Air outlet; 13. Air inlet; 14. Ash discharge pipe; 15. Filter cage; 16. Through hole. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.
[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0034] See Figure 1-3 This invention provides a glycine drying tail gas treatment device, which includes a pulse bag filter, a spray tower 1, and a granular carbon adsorption device. The pulse bag filter is used to separate the gas from the particulate material and recover the particulate material. The inlet of the spray tower 1 is connected to the outlet 12 of the pulse bag filter. The granular carbon adsorption device includes a demister 2, a drying heater 3, and a granular carbon adsorber 4. The outlet of the spray tower 1, the demister 2, the drying heater 3, and the granular carbon adsorber 4 are connected in sequence. The outlet of the granular carbon adsorber 4 is connected to the main exhaust stack 6. The granular carbon adsorber 4 can adsorb methanol in the gas.
[0035] In this glycine drying tail gas treatment device, the pulse bag filter can recover most of the glycine material, especially for the efficient collection of fine particulate matter. It can precisely and efficiently remove dust, with a dust removal efficiency typically exceeding 99%, effectively recovering materials and reducing losses. The application of the pulse bag filter achieves full particle size coverage for particulate matter treatment, stably meeting emission standards, optimizing energy consumption, and recovering previously unrecoverable materials, reducing the risk of blockage in the drying discharge pipeline. The granular carbon adsorption device can recover residual methanol in the tail gas before discharging it through the main exhaust stack 6. The tail gas treated by the spray tower 1 first undergoes dehydration treatment through the demister 2. The tail gas containing a large amount of methanol first enters the demister 2 to remove droplets ≥3μm from the waste gas, then enters the drying heater 3 to eliminate moisture interference and improve adsorption efficiency, and finally the granular carbon adsorber 4 adsorbs methanol. Because water molecules compete with methanol for adsorption sites, high humidity significantly reduces methanol adsorption. Therefore, the exhaust gas is first pretreated by demister 2 for dehumidification, which effectively adsorbs methanol, ensuring that the exhaust gas meets the standards and reducing the frequency of activated carbon replacement. Then, the heat from the drying heater 3 is used to remove moisture and suppress competitive adsorption. This steam heat exchange technology is simple to operate and suitable for moisture and low-boiling-point components. It also prevents static electricity buildup in low-humidity environments. The exhaust gas is then transported to the granular carbon adsorber 4 to adsorb methanol vapor, ensuring that the final exhaust gas emissions meet environmental emission standards.
[0036] Optionally, there are two granular carbon adsorbers 4, with the inlets of both granular carbon adsorbers 4 connected to the outlet of the drying heater 3, and the outlets of both granular carbon adsorbers 4 connected to the main exhaust stack 6.
[0037] There are two granular carbon adsorbers 4, designated as the first and second granular carbon adsorbers. These two adsorbers work alternately. When the first adsorber is adsorbing, the second adsorber is desorbing and regenerating. After the first adsorber completes its adsorption cycle, the system switches to the second adsorber, and the first adsorber desorbs and regenerates. This setup ensures that the tank of the granular carbon adsorber 4 remains dry during adsorption. After wastewater discharge, the water vapor in the tank of the granular carbon adsorber 4 undergoes both hot and cold drying treatments to evaporate the water vapor and lower the temperature from a high temperature to room temperature, completing regeneration. This prepares the two granular carbon adsorbers 4 to switch between adsorption and regeneration cycles, maintaining a good adsorption effect. The exhaust gas treated by the granular carbon adsorbers 4 is finally discharged at high altitude through the main exhaust stack 6.
[0038] Optionally, the granular carbon adsorber 4 incorporates multiple layers of activated carbon arranged sequentially. This multi-layered activated carbon design improves adsorption efficiency, prevents airflow short-circuiting, and enhances overall adsorption capacity. In this embodiment, coconut shell activated carbon is used, which is suitable for frequent regeneration, effectively reducing the risk of carbon powder clogging, while also demonstrating its excellent adsorption capacity, structural strength, and low sensitivity to interference factors.
[0039] Optionally, the pulse bag filter includes a housing, a pulse-jet system 10, filter bags, filter cages 15, and a dust hopper 9. The housing includes an upper housing 7 and a lower housing 8. The upper housing 7 is a clean gas chamber and has the air outlet 12. The filter bags and filter cages 15 are located inside the lower housing 8. The filter bags are fitted onto the filter cages 15, and the inside of the filter bags communicates with the clean gas chamber. The dust hopper 9 is fixedly located below the lower housing 8 and communicates with the lower housing 8. The pulse-jet system 10 is located above the filter bags and filter cages 15 and can intermittently fill the filter bags with air.
[0040] After large particles are collected by the cyclone separator, the material enters the pulse bag filter to filter fine dust. The dust is dislodged by the pulse jet cleaning system 10 and finally discharged from the ash hopper 9. Clean gas exits from the outlet 12 and enters the spray tower 1. The upper chamber 7 is the clean gas chamber, used to collect purified gas. After passing through the filter bags, the clean gas gathers here and exits from the outlet 12. The filter bags and cages are fixed inside the lower chamber 8, which is the main area for dust filtration. Dust-laden gas enters the lower chamber 8 from the inlet 13 and flows from the outside to the inside of the filter bags. The dust is blocked outside the filter bags, thus separating the dust and gas. The pulse jet cleaning system 10 sprays compressed air downwards towards the filter bag openings, causing the dust on the filter bags to fall off. The ash hopper 9 is used to collect the dislodged dust.
[0041] The upper chamber 7, lower chamber 8, and ash hopper 9 work together to achieve functional separation: preventing the mixing of clean air and dust-laden gas, thus ensuring filtration efficiency. Structural optimization: the upper chamber 7 is lightweight, while the ash hopper 9 is reinforced for load-bearing capacity. Easy maintenance: the split design facilitates segmented maintenance; for example, replacing the filter bag only requires opening the upper chamber 7.
[0042] Optionally, the pulse jet system 10 includes multiple pulse valves, multiple nozzles, and an air source system. The multiple pulse valves and multiple nozzles are arranged in a one-to-one correspondence. The two ends of the pulse valves are respectively connected to the nozzles and the air source system. The nozzles are located above the filter bag and the filter cage 15.
[0043] The pulse jet cleaning system 10 employs a pulse jet cleaning method. Its core principle is to use short-duration, high-pressure airflow to impact the filter bags, causing adhering dust to detach and maintaining dust removal efficiency. In this embodiment, a total of 12 sets are configured, each set operating every 90 seconds. The process involves compressed air from the air tank in the air supply system being piped to the pulse valve inlet. The control system sends an electrical signal, instantly opening the pulse valve, and compressed air is instantly injected into the filter bags through the nozzles. The filter bags expand instantly, and the high-speed airflow draws in surrounding air, creating a "Venturi effect." The dust layer is impacted and falls into the dust hopper 9. This ensures thorough cleaning and supports online cleaning without requiring system shutdown.
[0044] Optionally, an ash discharge valve 11 is provided at the bottom of the ash hopper 9. The ash discharge valve 11 discharges the dust, which is then discharged through the ash pipe 14 to an external collection device. The ash hopper 9 centrally stores the dust after cleaning. The ash hopper 9 has a conical structure with a certain inclination angle to ensure dust slides off and prevents accumulation and blockage. The material falls into the ash hopper 9 by its own gravity. The ash discharge valve 11 controls dust discharge while maintaining a seal between the ash hopper 9 and the outside, enabling fully enclosed dust transportation, meeting strict environmental protection requirements, and improving the on-site environment.
[0045] Optionally, the ash hopper 9 is conical. The ash hopper 9 is responsible for collecting, storing, and discharging dust detached from the filter bags during cleaning, ensuring the continuous and stable operation of the pulse jet baghouse dust collector. The core functions of the ash hopper 9 are: dust collection: receiving dust detached during cleaning and preventing its accumulation in the filter bag area; temporary storage and buffering: the ash hopper 9 acts as a transition container, balancing the conflict between continuous cleaning and intermittent dust discharge; sealed dust discharge: preventing external air from entering or dust from overflowing, avoiding "secondary dust generation"; and automated control: automatically adjusting the dust discharge frequency according to the amount of dust, reducing manual intervention.
[0046] Optionally, the filter cage 15 is cylindrical. The filter cage 15 is cylindrical, and the filter bag is fitted over the outside of the filter cage 15. The filter cage 15 effectively supports the filter bag, has high structural strength, strong resistance to deformation, and is easy to install and replace—simply insert or remove it, resulting in high maintenance efficiency. Dust-laden gas enters the lower housing 8 through the inlet 13. As the gas passes through the filter bag, dust is trapped on the outer surface of the filter bag, forming a "dust cake." The dust cake itself becomes a high-efficiency filtration layer, capable of capturing finer particles.
[0047] Optionally, the filter cage 15 has a plurality of through holes 16 spaced apart on its side wall. Gas enters the interior through the through holes 16.
[0048] Optionally, the filter bag is made of coated polyester needle-punched felt. The coated polyester needle-punched felt material provides anti-static properties and improves safety; top-mounted bag replacement makes replacement convenient and maintenance easy; it can capture fine dust, providing high filtration accuracy and significantly reducing the proportion of material entering the drying spray tower 1.
[0049] The working process of the glycine drying exhaust gas treatment device:
[0050] Dust-laden gas enters the lower chamber 8 of the pulse bag filter through inlet 13. After being evenly distributed by the guide plate, the gas flows from the outside to the inside of the filter bags. Dust is intercepted by the outer surface of the filter bags, while clean gas passes through the filter bags into the upper chamber 7 and then exits through outlet 12. As dust accumulates on the surface of the filter bags, the pulse jet cleaning device is triggered at fixed time intervals, with a total of 12 sets, each set once every 90 seconds. Compressed air is used to instantly vibrate the filter bags, shaking the dust off into the dust hopper 9. Finally, the dust is discharged through the ash discharge valve 11 and the conveying device, achieving continuous and efficient gas-solid separation. After exiting through outlet 12, the clean gas enters the spray tower 1. The methanol-rich tail gas first passes through the demister 2 to remove large-diameter droplets such as acid mist and water mist. Subsequently, the tail gas enters the drying heater 3 to eliminate interference from moisture and other low-boiling-point liquids, thereby improving adsorption efficiency. Then, the methanol in the tail gas is adsorbed by the granular carbon adsorber 4. There are two granular carbon adsorbers 4, operating in an alternating cycle: when the first granular carbon adsorber performs adsorption, the second granular carbon adsorber performs desorption and regeneration. Once the first granular carbon adsorber completes its adsorption phase, the two adsorbers 4 switch operating states, with the second adsorber starting adsorption while the first performs desorption and regeneration. During this alternating adsorption process, the internal environment of each adsorber 4 is kept dry. After wastewater discharge, the water vapor inside the adsorbers 4 undergoes both hot and cold drying to evaporate the moisture and lower the temperature from high to room temperature, completing the regeneration process. Subsequently, the two adsorbers 4 switch states again and continue the adsorption-regeneration cycle to maintain high adsorption performance. Finally, the treated exhaust gas passes inspection and is discharged at high altitude through the main exhaust stack 6.
[0051] Obviously, the above-disclosed embodiments of the present invention are merely for illustrating the present invention. The embodiments do not exhaustively describe all details, nor do they limit the present invention to only the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. It is neither necessary nor possible to exhaustively list all embodiments here.
Claims
1. A glycine drying tail gas treatment device, characterized in that, include: Pulse jet baghouse dust collectors are used to separate gas from particulate matter and recover particulate matter. The inlet of the spray tower (1) is connected to the outlet (12) of the pulse bag dust collector; The particulate carbon adsorption device includes a demister (2), a dryer heater (3) and a particulate carbon adsorber (4). The outlet of the spray tower (1), the demister (2), the dryer heater (3) and the particulate carbon adsorber (4) are connected in sequence. The outlet of the particulate carbon adsorber (4) is connected to the main exhaust stack (6). The particulate carbon adsorber (4) can adsorb methanol in the gas.
2. The glycine drying tail gas treatment device according to claim 1, characterized in that: There are two granular carbon adsorbers (4). The inlets of both granular carbon adsorbers (4) are connected to the outlet of the drying heater (3), and the outlets of both granular carbon adsorbers (4) are connected to the main exhaust stack (6).
3. The glycine drying tail gas treatment device according to claim 1, characterized in that: The granular carbon adsorber (4) has multiple activated carbon layers arranged in sequence inside.
4. The glycine drying tail gas treatment device according to claim 1, characterized in that: The pulse bag dust collector includes a housing, a pulse jet system (10), filter bags, filter cages (15), and a dust hopper (9). The housing includes an upper housing (7) and a lower housing (8). The upper housing (7) is a clean gas chamber and has the air outlet (12). The filter bags and filter cages (15) are located inside the lower housing (8). The filter bags are fitted inside the filter cages (15), and the inside of the filter bags is connected to the clean gas chamber. The dust hopper (9) is fixedly located below the lower housing (8) and is connected to the lower housing (8). The pulse jet system (10) is located above the filter bags and filter cages (15) and can intermittently fill the filter bags with air.
5. The glycine drying tail gas treatment device according to claim 4, characterized in that: The pulse jet system (10) includes multiple pulse valves, multiple nozzles and an air source system. The multiple pulse valves and multiple nozzles are set one-to-one. The two ends of the pulse valves are connected to the nozzles and the air source system respectively. The nozzles are located above the filter bags and filter cages (15).
6. The glycine drying tail gas treatment device according to claim 4, characterized in that: The ash hopper (9) is conical.
7. The glycine drying tail gas treatment device according to claim 4, characterized in that: The ash hopper (9) is provided with an ash discharge valve (11) at its lowest point.
8. The glycine drying tail gas treatment device according to claim 4, characterized in that: The filter cage (15) is cylindrical.
9. The glycine drying tail gas treatment device according to claim 4, characterized in that: The filter cage (15) has multiple through holes (16) spaced apart on its side wall.
10. The glycine drying tail gas treatment device according to claim 4, characterized in that: The filter bag is made of coated polyester needle-punched felt material.