A black adsorption cascade purification system

Abstract

This utility model belongs to the field of waste gas treatment technology, specifically disclosing a black adsorption cascade purification system. The system includes a flue gas duct, a primary turbulent acceleration unit, a primary reaction zone, a secondary turbulent acceleration unit, a secondary reaction zone, a bag filter, and a circulation mechanism. The flue gas sequentially passes through the primary turbulent acceleration unit, mixes with used powder, and enters the primary reaction zone. It then passes through the secondary turbulent acceleration unit, mixes with fresh powder, and enters the secondary reaction zone. Finally, the bag filter removes particulate matter. The bag filter has multiple collection chambers. Some collection chambers are connected to a circulating dust powder distribution device via a circulating dust powder feeding device, returning the adsorbent-active used powder to the primary reaction zone. The remaining collection chambers are connected to a by-product chamber. A rotary feeder is installed in the circulating dust powder distribution device to control the quantitative return of used powder. This device has a compact structure, high adsorption efficiency, and high dust powder utilization rate, making it suitable for the efficient purification of flue gas from anode roasting in the carbon industry.

Description

Technical Field

[0001] This utility model belongs to the field of waste gas treatment technology, specifically relating to a black adsorption cascade purification system. Background Technology

[0002] The exhaust gas emitted from the anode roasting process in the current carbon industry has a complex composition, with the main pollutants including asphalt fumes, particulate matter, SO2, and NO. X Among these, asphalt fumes, due to their high viscosity, high carbon content, and easy adhesion, are difficult to remove efficiently using traditional dry or wet processes.

[0003] "Black adsorption technology" is an emerging method of waste gas purification. It utilizes carbon-based adsorption materials with high specific surface area (such as dust collection carbon powder, metallurgical coke powder, etc.) to physically and chemically adsorb organic pollutants such as asphalt fumes. It has advantages such as high treatment efficiency and low secondary pollution.

[0004] However, existing black adsorption systems generally suffer from problems such as system complexity, low dust recycling rate, and difficulty in adjusting the gas-solid ratio. They lack effective dust screening and recycling mechanisms, which prevents the efficient utilization of unsaturated or still active dust according to changes in operating conditions. This increases the frequency of adding new dust, resulting in high system energy consumption and a significant increase in material costs, thus hindering the large-scale promotion and application of this technology. Utility Model Content

[0005] This invention addresses the problems in the prior art by providing a black adsorption cascade purification system to solve the issues of low dust collection utilization and high energy consumption in the aforementioned background technology.

[0006] The technical solution adopted in this utility model is as follows:

[0007] This application provides a black adsorption cascade purification system, including a flue gas duct, which is connected to a primary reaction zone via a primary turbulent acceleration unit. The primary reaction zone is connected to a secondary reaction zone via a secondary turbulent acceleration unit. The secondary reaction zone is connected to a fresh dust collection powder injection device and a bag filter. The bag filter has at least two collection chambers, at least one of which is connected to a by-product chamber. The system also includes a circulation mechanism, which includes a dust collection powder circulation distribution device with both ends connected to the flue gas duct and the primary turbulent acceleration unit, and at least one circulating dust collection powder discharge device, with both ends connected to the collection chamber and the dust collection powder circulation distribution device, respectively.

[0008] Furthermore, the dust collection and distribution device is equipped with baffle doors.

[0009] Furthermore, the primary turbulent acceleration unit includes a primary acceleration zone and a primary mixing zone, with one end of the dust collection and distribution device connected to the primary mixing zone.

[0010] Furthermore, one end of the dust collection and distribution device, which is connected to the primary mixing zone, is inserted into the primary mixing zone and connected to a material outlet.

[0011] Furthermore, the secondary turbulent acceleration unit is vertically arranged, the primary reaction zone is located below the secondary turbulent acceleration unit, and the secondary reaction zone is located above the secondary turbulent acceleration unit. The secondary turbulent acceleration unit includes a secondary acceleration zone and a secondary mixing zone.

[0012] Furthermore, the outlet end of the new dust collection powder injection device is inserted into the secondary reaction zone, and the outlet end of the new dust collection powder injection device opens vertically downwards.

[0013] Furthermore, the baghouse dust collector includes five collection chambers, numbered 1 to 5. There are three circulating dust collection powder feeding devices, which are connected to collection chambers 1 to 3 in a corresponding manner. Collection chambers 2 to 5 are connected to the by-product chamber through a by-product discharge device.

[0014] Furthermore, the circulating dust collection powder feeding device is equipped with a rotary feeder to control the amount of material fed from the collection bin to the circulating dust collection powder distribution device.

[0015] As can be seen from the above technical solutions, the advantages of this utility model are:

[0016] (1) By setting up two independent material conveying systems, the first stage is for recirculating dust collection and the second stage is for fresh dust collection. The two can be balanced and adjusted flexibly in application.

[0017] (2) Through the two-stage reaction zone step-by-step purification, the utilization rate of the dust collection powder can be fully improved, and higher adsorption efficiency can be achieved. The process is simple, the operation is simple, and the amount of new and old dust collection powder can be controlled.

[0018] (3) The roasting flue is arranged below the bag filter. The recirculated dust can fall into the dust collection distribution device by gravity through the rotating feeder and be pneumatically conveyed to the outlet diffusion section of the first-stage turbulent acceleration device. This device occupies a small area, the system is simple and efficient, and reduces investment costs and operating expenses. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the black adsorption cascade purification system.

[0021] In the diagram: 1. Primary turbulent acceleration unit; 2. Dust collection powder circulation distribution device; 3. Baffle gate; 4. Primary reaction zone; 5. Secondary turbulent acceleration unit; 6. New dust collection powder injection device; 7. Secondary reaction zone; 8. Bag dust collector; 9. Circulating dust collection powder feeding device; 10. Flue gas duct; 11. By-product discharge device. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1 As shown, this utility model provides a black adsorption cascade purification system, including a flue gas duct 10. The flue gas duct 10 is connected to a primary reaction zone 4 through a primary turbulence acceleration unit 1. The primary reaction zone 4 is connected to a secondary reaction zone 7 through a secondary turbulence acceleration unit 5. The secondary reaction zone 7 is connected to a new dust collection powder injection device 6 and a bag filter 8. The bag filter 8 is provided with at least two collection chambers, at least one of which is connected to a by-product chamber. The device also includes a circulation mechanism, which includes a dust collection powder circulation distribution device 2 with its two ends connected to the flue gas duct 10 and the primary turbulence acceleration unit 1, respectively. It also includes at least one circulating dust collection powder feeding device 9, with its two ends connected to the collection chamber and the dust collection powder circulation distribution device 2, respectively.

[0024] A main channel for flue gas treatment and a circulation channel for the return of old powder are formed. A tiered purification path is constructed through two-stage adsorption zones, which effectively improves the efficiency of asphalt fume removal.

[0025] High-temperature flue gas from the anode roasting section enters the flue gas duct 10 after pretreatment. It first passes through the primary turbulent acceleration unit 1 and mixes with the old powder. It completes preliminary adsorption in the primary reaction zone 4 and then enters the secondary turbulent acceleration unit 5 to fully mix with the added new powder. After further purification in the secondary reaction zone 7, it is sent to the bag dust collector 8 to complete dust collection. Some of the collected dust (old powder) is returned to the primary reaction zone 4 for reuse through the circulation mechanism, and the remaining collected dust is collected and treated in the by-product bin.

[0026] In some embodiments, the dust collection and distribution device 2 is provided with a baffle door 3.

[0027] The baffle gate 3 can control the opening or closing of the old powder return path, making it easy to adjust the return ratio according to the system operating conditions and enhancing the system's operational flexibility.

[0028] When the recirculated dust entering the primary reaction zone 4 has good activity or the inlet asphalt fume concentration is not high, most pollutants can be treated by the primary reaction zone 4 alone. In this case, the amount of fresh dust added to the secondary reaction zone 7 can be reduced as much as possible and dynamically adjusted. Conversely, when the recirculated dust entering the primary reaction zone 4 has decreased activity or the inlet asphalt fume concentration is very high, the treatment capacity of the secondary reaction zone 7 can be increased to ensure that emissions meet the standards.

[0029] In some embodiments, the primary turbulence acceleration unit 1 includes a primary acceleration zone and a primary mixing zone, and one end of the dust collection and distribution device 2 is connected to the primary mixing zone.

[0030] By dividing the acceleration zone and the mixing zone, the flue gas disturbance can be effectively enhanced, the mixing effect between the old powder and the flue gas can be improved, and the uniformity and fullness of the adsorption reaction can be guaranteed.

[0031] In practical applications, a flow guiding component is set in the primary acceleration zone to generate a rotating turbulence effect in the flue gas, while the mixing zone is a dust-gas fusion area. The old dust from the dust collection and circulation distribution device 2 is injected from the upstream and comes into full-volume contact with the high-speed turbulent flue gas, thereby improving the primary adsorption efficiency.

[0032] In some embodiments, the end of the dust collection and distribution device 2 that is connected to the primary mixing zone is inserted into the primary mixing zone and is connected to a material outlet.

[0033] The dust collection powder circulation distribution device 2 is inserted inside the mixing zone and has a material dispensing port, which is conducive to the directional delivery of old powder in the core area of ​​flue gas turbulence, preventing agglomeration and blockage, and improving the uniformity of mixing and distribution.

[0034] The material inlet has a conical structure and an anti-sticking surface treatment, which allows old powder to fall evenly into the core vortex zone of the mixing area under the impact of airflow, improving the efficiency of gas-solid interaction and reducing the risk of powder deposition.

[0035] In some embodiments, the secondary turbulent acceleration unit 5 is vertically arranged, the primary reaction zone 4 is arranged below the secondary turbulent acceleration unit 5, and the secondary reaction zone 7 is arranged above the secondary turbulent acceleration unit 5. The secondary turbulent acceleration unit 5 includes a secondary acceleration zone and a secondary mixing zone.

[0036] The vertical arrangement can be designed to follow the gas flow direction, allowing the flue gas to pass through disturbance, mixing and secondary adsorption in sequence, which helps to build a compact and staged purification process.

[0037] In a typical arrangement, the secondary acceleration zone is equipped with a spiral guide plate to guide the flue gas to rotate and rise. After entering the secondary mixing zone, it is evenly mixed with the new powder, and then enters the upper secondary reaction zone 7 to complete fine adsorption. This structure not only facilitates gravity powder feeding control, but also enhances the degree of gas-powder mixing.

[0038] In some embodiments, the outlet end of the new dust collection powder injection device 6 is inserted into the secondary reaction zone 7 and the outlet end of the new dust collection powder injection device 6 opens vertically downward.

[0039] The new dust collection and powder injection device 6 allows the new powder to fall directly into the reaction zone by its own gravity, avoiding blockages and deviations that may be caused by lateral conveying, and improving feeding efficiency and uniformity.

[0040] In practical use, the new powder is pneumatically conveyed into the new dust collection powder injection device 6, where it is rapidly mixed with the disturbed flue gas at the outlet end to maintain uniform particle size and distribution, thus optimizing the secondary adsorption reaction conditions.

[0041] In some embodiments, the baghouse dust collector 8 includes multiple collection chambers. In this embodiment, there are five collection chambers, which are numbered 1 to 5 in sequence. There are three circulating dust collection powder feeding devices 9, which are connected to collection chambers 1 to 3 in a one-to-one correspondence. The discharge from collection chambers 2 and 3 can be transported to the circulation pipeline or discharged externally through the by-product discharge device 11 connected to the by-product chamber as needed. The remaining collection chambers are discharged externally through the by-product discharge device 11 connected to the by-product chamber.

[0042] By setting up multiple independent collection chambers for bag dust collector 8 and separating them for old powder recycling and by-product collection, resource utilization is improved.

[0043] In some embodiments, the circulating dust collection powder feeding device 9 is provided with a rotary feeder for controlling the amount of material fed from the collection bin connected to the circulating dust collection powder feeding device 9 to the circulating dust collection powder distribution device 2.

[0044] Setting up a rotary feeder helps to quantitatively feed old powder to the dust collection and distribution device 2, preventing excessive feeding or blockage, and improving the continuity and stability of system operation.

[0045] The rotary feeder can intermittently convey old powder to the inlet of the dust collection powder circulation distribution device 2 at a set frequency. It is equipped with a speed sensor and a feeding detection module to ensure that the feeding rhythm is synchronized with the system's adsorption capacity, thereby achieving intelligent closed-loop control.

[0046] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0048] The terminology used in one or more embodiments of this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this specification. The singular forms “a,” “described,” and “the” as used in one or more embodiments of this specification and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this embodiment refers to and includes any or all possible combinations of one or more associated listed items.

[0049] It should be understood that although the terms first, second, third, etc., may be used to describe various information in one or more embodiments of this specification, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of one or more embodiments of this specification, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "in response to a determination," or "when," or "in the event of a determination."

[0050] The above description is merely a preferred embodiment of one or more embodiments of this specification and is not intended to limit the scope of one or more embodiments of this specification. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the protection scope of one or more embodiments of this specification.

Claims

1. A black liquor adsorption step purification system comprising a flue gas duct (10), characterized in that, The flue gas duct (10) is connected to the first-stage reaction zone (4) through the first-stage turbulence acceleration unit (1). The first-stage reaction zone (4) is connected to the second-stage reaction zone (7) through the second-stage turbulence acceleration unit (5). The second-stage reaction zone (7) is connected to a new dust collection powder injection device (6). The second-stage reaction zone (7) is connected to a bag filter (8). The bag filter (8) is provided with at least two collection chambers. At least one collection chamber is connected to a by-product chamber. The device also includes a circulation mechanism. The circulation mechanism includes a dust collection powder circulation distribution device (2) whose two ends are respectively connected to the flue gas duct (10) and the first-stage turbulence acceleration unit (1). It also includes at least one circulating dust collection powder feeding device (9). The two ends of the circulating dust collection powder feeding device (9) are respectively connected to the collection chamber and the dust collection powder circulation distribution device (2).

2. The black liquor adsorption cascade purification system of claim 1, wherein, The dust collection and distribution device (2) is equipped with a baffle door (3).

3. The black liquor adsorption cascade purification system of claim 1, wherein, The primary turbulent acceleration unit (1) includes a primary acceleration zone and a primary mixing zone, and one end of the dust collection and distribution device (2) is connected to the primary mixing zone.

4. The black liquor adsorption cascade purification system of claim 3, wherein, The dust collection and distribution device (2) is connected to the primary mixing zone at one end, which is inserted into the primary mixing zone and connected to a material outlet.

5. The black adsorption cascade purification system according to claim 1, characterized in that, The secondary turbulent acceleration unit (5) is set vertically, the primary reaction zone (4) is set below the secondary turbulent acceleration unit (5), and the secondary reaction zone (7) is set above the secondary turbulent acceleration unit (5). The secondary turbulent acceleration unit (5) includes a secondary acceleration zone and a secondary mixing zone.

6. The black adsorption cascade purification system according to claim 5, characterized in that, The outlet end of the new dust collection powder injection device (6) is inserted into the secondary reaction zone (7) and the outlet end of the new dust collection powder injection device (6) opens vertically downward.

7. The black adsorption cascade purification system according to claim 1, characterized in that, The baghouse dust collector (8) includes five collection chambers, which are numbered 1 to 5 in sequence. There are three circulating dust collection powder feeding devices (9). The circulating dust collection powder feeding devices (9) are connected to the number 1 to 3 collection chambers one by one. The number 2 to 5 collection chambers are connected to the by-product chambers through the by-product discharge device (11).

8. The black adsorption cascade purification system according to claim 1, characterized in that, A rotary feeder is installed in the circulating dust collection powder feeding device (9) to control the amount of material fed from the collection bin to the circulating dust collection powder distribution device (2).

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