Coke oven waste gas desulfurization ultra-low emission system

Abstract

This application provides an ultra-low emission desulfurization system for coking waste gas, with the following technical solution: It includes a dust removal pipeline for coke oven pushing flue gas, which is connected to a dust collector. The dust removal pipeline is connected to a desulfurizing agent grinding system via a conveying pipe. The outlet end of the conveying pipe is connected to a uniform diffuser inside the dust removal pipeline. This application achieves thorough mixing of the desulfurizing agent and flue gas by connecting the desulfurizing agent grinding system to the dust removal pipeline and employing a multi-stage diffuser structure. Simultaneously, the automatic control system adjusts the desulfurizing agent dosage in real time, resulting in improved desulfurization efficiency, ultra-low emissions, enhanced system automation, and improved mixing effect between the desulfurizing agent and flue gas.

Description

Technical Field

[0001] This utility model relates to the field of coking desulfurization, specifically to an ultra-low emission system for desulfurizing coking waste gas. Background Technology

[0002] During the coking process in coke ovens, a large amount of dust-laden flue gas is generated. This flue gas enters the dust removal pipeline and dust collector for treatment through flue gas ducts. Although existing technologies can remove particulate matter from the flue gas through dust removal equipment, the combustion of coke in the furnace can lead to excessive sulfur dioxide emission concentrations due to unstable reactions or low temperatures. This untreated sulfur dioxide, emitted with the flue gas, not only causes serious environmental pollution but also corrodes surrounding equipment, affecting the stable operation of the production system. Especially when the sulfur dioxide concentration in the flue gas fluctuates significantly, traditional treatment systems struggle to achieve stable desulfurization effects, resulting in emissions failing to consistently meet increasingly stringent environmental protection requirements. Furthermore, existing technologies suffer from poor mixing of desulfurizing agents with flue gas, resulting in low desulfurization efficiency, and insufficient system automation, making it impossible to adjust the desulfurizing agent dosage in real time based on flue gas parameters. Utility Model Content

[0003] To address the aforementioned problems, this invention provides an ultra-low emission desulfurization system for coking waste gas.

[0004] This utility model is achieved through the following technical solution:

[0005] This application provides an ultra-low emission desulfurization system for coking exhaust gas, the technical solution of which is as follows: it includes a dust removal pipeline for coke oven pushing flue gas, the dust removal pipeline is connected to a dust collector, the dust removal pipeline is connected to a desulfurizing agent grinding system through a conveying pipe, and the outlet end of the conveying pipe is connected to a uniform diffuser inside the dust removal pipeline.

[0006] Furthermore, this application also proposes that the desulfurizing agent grinding system includes a mill and a feed hopper on top of it, and a powder-air blower is connected to the lower discharge port of the mill. The powder-air blower transports the powder from the mill along the conveying pipe to a uniform diffuser to mix with the flue gas.

[0007] Furthermore, this application also proposes that the diffuser includes a first diffuser cap, a second diffuser cap, and a third diffuser cap whose areas gradually increase along the conveying direction of the dust removal duct.

[0008] Furthermore, this application also proposes that the first diffusion cap, the second diffusion cap, and the third diffusion cap are cone-shaped, with through holes of different sizes in the center of the first diffusion cap and the edges of the through holes being provided with flow guiding bends.

[0009] Furthermore, this application also proposes that the first diffusion cap is connected and fixed to the outlet end of the delivery pipe by multiple fixing rods, the edge of the second diffusion cap is fixed to the outer end of the first diffusion cap by multiple fixing rods, and the third diffusion cap is connected to the outer end of the second diffusion cap by multiple fixing rods.

[0010] Furthermore, this application also proposes that the desulfurizing agent grinding system further includes an automatic control system, which includes a controller electrically connected to a dust sensor installed in the dust removal pipeline and a control valve installed on the conveying pipe, and electrically connected to the air-powder fan and the drive motor of the mill.

[0011] Compared with existing technologies, the advantages of this utility model are: by connecting the desulfurizing agent grinding system with the dust removal pipeline and adopting a multi-stage diffuser structure, this utility model achieves full mixing of the desulfurizing agent and flue gas. At the same time, by adjusting the amount of desulfurizing agent added in real time through an automatic control system, it has the advantages of improving desulfurization efficiency, achieving ultra-low emissions, enhancing the automation level of the system, and improving the mixing effect of desulfurizing agent and flue gas. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the system of this utility model;

[0013] Figure 2 This is a schematic diagram of the structure of a practical uniform diffuser;

[0014] Figure 3 yes Figure 2 Enlarged schematic diagram of a local structure;

[0015] In the diagram: 1. Dust removal pipe; 2. Dust collector; 3. High-pressure blower; 4. Chimney; 5. Mill; 6. Material box; 7. Air-powder blower; 8. Conveying pipe; 9. Uniform diffuser; 91. First diffuser cap; 92. Second diffuser cap; 93. Third diffuser cap; 94. Through hole; 95. Guide bend; 96. Fixing rod; 10. Controller; 11. Control valve; 12. Dust sensor. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments:

[0017] like Figure 1 As shown, this application proposes an ultra-low emission desulfurization system for coking exhaust gas, including a dust removal pipeline for coke oven pushing flue gas. The dust removal pipeline is connected to a dust collector and is connected to a desulfurizing agent grinding system via a conveying pipe. The outlet end of the conveying pipe is connected to a uniform diffuser inside the dust removal pipeline.

[0018] Dust collection ducts can be circular cross-section pipes, made of high-temperature and corrosion-resistant stainless steel or carbon steel lined with anti-corrosion materials. Dust collectors can be bag filters or electrostatic precipitators, with a dust removal efficiency of 99% or higher. Pneumatic conveying pipes can be used, with the pipe diameter determined based on the desulfurizing agent delivery rate, typically 100-150 mm. Uniform diffusers can employ perforated plate structures or conical diffuser structures to ensure uniform distribution of the desulfurizing agent in the flue gas.

[0019] The desulfurizing agent grinding system delivers finely ground desulfurizing agent to the dust removal duct via a conveying pipe, where it is thoroughly mixed with the flue gas by a uniform diffuser. Sulfur dioxide in the flue gas reacts chemically with the desulfurizing agent, calcium hydroxide, to form stable sulfate compounds, thus achieving ultra-low sulfur dioxide emissions. This system, by incorporating a uniform diffuser in the dust removal duct, solves the problem of uneven mixing between the desulfurizing agent and flue gas in traditional desulfurization systems, improving desulfurization efficiency and reducing sulfur dioxide emission concentrations. The direct connection between the dust removal duct and the desulfurizing agent grinding system simplifies the system structure and reduces the equipment footprint.

[0020] Furthermore, this application also proposes that the desulfurizing agent grinding system includes a mill and a feed hopper on top of it, and a powder-air blower is connected to the lower discharge port of the mill. The powder-air blower transports the powder from the mill along the conveying pipe to a uniform diffuser to mix with the flue gas.

[0021] Specifically, the mill adopts a vertical or horizontal structure, with a material hopper volume of 1-2 cubic meters, made of 304 stainless steel. The air-powder blower uses frequency conversion control, with an air volume adjustment range of 2000-5000 cubic meters / hour. The conveying pipe uses wear-resistant ceramic-lined steel pipe with a diameter of 150 mm. Conveying is carried out at a rate of 1 ton / hour. The uniform diffuser adopts a multi-stage diffusion structure with a diffusion angle of 15-30 degrees. As a preferred embodiment, the mill is equipped with a classifying wheel device, which can grind the desulfurizing agent to a fineness of 200-400 mesh.

[0022] Therefore, this technical solution uses a grinding system to pulverize the desulfurizing agent to a suitable fineness, which is then quantitatively delivered to the flue gas duct by a pulverized air blower, achieving uniform mixing with the flue gas at the diffuser. The multi-stage diffusion structure promotes sufficient contact between the gas and solid phases. Compared to directly introducing the desulfurizing agent into the flue gas duct, this solution solves the problems of uneven mixing and low reaction efficiency in traditional methods, increasing the utilization rate of the desulfurizing agent by more than 30% and significantly enhancing the system's operational stability.

[0023] Furthermore, this application proposes that the diffuser includes multiple first diffusion caps, second diffusion caps, and third diffusion caps with gradually decreasing areas along the conveying direction of the dust removal pipeline. The first, second, and third diffusion caps are conical in shape, with through holes of different sizes in the center of the first and second diffusion caps, and guide bends at the edges of the through holes. The first diffusion cap is connected and fixed to the outlet end of the conveying pipe by multiple fixing rods, the edge of the second diffusion cap is fixed to the outer end of the first diffusion cap by multiple fixing rods, and the third diffusion cap is connected to the outer end of the second diffusion cap by multiple fixing rods.

[0024] Specifically, the diffuser employs a multi-stage diffuser cap structure, achieving multi-stage mixing of flue gas and desulfurizing agent through diffuser caps with gradually decreasing areas. The conical structure guides the airflow direction, the through-hole controls the airflow rate, and the guide bend reduces airflow turbulence, ensuring the desulfurizing agent diffuses along the guide bend towards the outside of the conical structure. The fixing rods are evenly spaced and circumferentially distributed to ensure the concentricity and structural stability of each diffuser cap stage. As a preferred embodiment, the diffuser caps can be made of high-temperature resistant stainless steel, and the fixing rods employ an adjustable-length threaded connection structure.

[0025] Therefore, this technical solution effectively solves the problem of uneven mixing in traditional single-stage diffusers through a gradient diffusion design with multi-stage diffusion caps. Specifically, the first diffusion cap initially slows down the high-speed airflow, the second diffusion cap achieves secondary flow splitting through the central through-hole, and the third diffusion cap completes the final diffusion. The design of the guide bend creates a swirling flow, improving the contact efficiency between the desulfurizing agent and the flue gas. Compared with existing technologies, this structure achieves more uniform gas-solid mixing, avoiding the problem of decreased desulfurization efficiency caused by excessively high local concentrations.

[0026] Furthermore, this application also proposes that the first diffusion cap is connected and fixed to the outlet end of the delivery pipe by multiple fixing rods, the edge of the second diffusion cap is fixed to the outer end of the first diffusion cap by multiple fixing rods, and the third diffusion cap is connected to the outer end of the second diffusion cap by multiple fixing rods.

[0027] Specifically, the fixing rods can be made of metal, such as stainless steel or carbon steel, with a preferred diameter range of 5-15 mm. The fixing rods are secured to the diffuser caps by welding or bolting. As a preferred embodiment, each diffuser cap has 3-6 fixing rods evenly distributed circumferentially. The length of the fixing rods is adjusted according to the spacing between the diffuser caps to ensure structural stability. Furthermore, the installation angle of the fixing rods can be set perpendicular to the diffuser cap surface or at a certain angle to optimize airflow guidance.

[0028] Therefore, this technical solution achieves modular assembly of the diffuser through a multi-stage fixed rod connection structure, where the three-stage diffuser caps form a rigid frame with progressively supporting supports via fixed rods. This design ensures the diffuser maintains structural stability in high-speed flue gas environments, preventing deformation or displacement caused by airflow impact. Specifically, the fixed connection between the outlet end of the delivery pipe and the first diffuser cap forms primary support; the radial fixation between the first and second diffuser caps forms secondary support; and the extended fixation between the second and third diffuser caps constitutes tertiary support, thus forming a progressive mechanical transmission path. Compared with existing technologies, this structure not only simplifies the installation process but also effectively improves the durability of the diffuser under high-temperature and high-flow-rate conditions through distributed force design, ensuring a uniform mixing effect between the desulfurizing agent and the flue gas.

[0029] Furthermore, this application also proposes that the first diffusion cap is connected and fixed to the outlet end of the delivery pipe by multiple fixing rods, the edge of the second diffusion cap is fixed to the outer end of the first diffusion cap by multiple fixing rods, and the third diffusion cap is connected to the outer end of the second diffusion cap by multiple fixing rods.

[0030] Therefore, by employing a multi-stage fixing rod connection structure, stable fixation of the diffusion cap within the dust removal pipeline is achieved. The first diffusion cap is directly fixed to the outlet end of the conveying pipe, ensuring the initial diffusion effect of the desulfurizing agent powder. The second diffusion cap is connected to the first diffusion cap via fixing rods, further expanding the diffusion range of the powder. The third diffusion cap is connected to the second diffusion cap via fixing rods, ultimately achieving uniform distribution of the powder within the pipeline. This staged fixing method not only ensures the structural stability of the diffusion caps but also avoids vibration and displacement caused by airflow impact, thereby improving the mixing efficiency of the desulfurizing agent and flue gas. Compared with existing technologies, this solution, by optimizing the fixing method of the diffusion caps, solves the problem of uneven mixing caused by insecure fixing in traditional structures, thus improving the desulfurization effect.

[0031] Furthermore, this application proposes to install an automatic control system in the coking waste gas desulfurization ultra-low emission system. The automatic control system includes a controller, which is electrically connected to a dust sensor installed in the dust removal pipeline and a control valve installed on the conveying pipe. The controller is also electrically connected to the drive motors of the air-coal fan and the mill.

[0032] Dust sensors, such as laser scattering or beta-ray sensors, are installed in the middle or at the outlet of the dust removal duct to monitor the dust concentration in the flue gas in real time. Control valves, such as electrically operated or pneumatically operated butterfly valves, are installed at the beginning or middle of the delivery pipe to regulate the flow rate of the desulfurizing agent. The controller, such as a PLC or DCS system, receives signals from the dust sensors through a preset program and adjusts the opening of the control valves accordingly, while simultaneously controlling the speed of the air-powder blower and the start / stop of the mill motor.

[0033] Specifically, when the dust sensor detects that the dust concentration in the flue gas exceeds the standard, the controller increases the opening of the control valve and increases the speed of the air-flue fan, thereby increasing the amount of desulfurizing agent delivered. Simultaneously, the controller starts the mill's drive motor to ensure a continuous supply of desulfurizing agent. Conversely, when the dust concentration decreases, the controller reduces the amount of desulfurizing agent delivered accordingly. This achieves automatic adjustment of the desulfurizing agent dosage, ensuring stable removal of sulfur dioxide from the flue gas. Compared to manual adjustment, this automatic control system can respond more quickly and accurately to changes in flue gas composition, avoiding waste of desulfurizing agent or poor treatment results.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A desulfurization and ultra-low emission system for coking waste gas, comprising a dust removal pipe (1) for coke oven pushing flue gas, wherein the dust removal pipe (1) is connected to a dust collector (2), characterized in that: The dust removal pipeline (1) is connected to the desulfurizing agent grinding system through the conveying pipe (8), and the outlet end of the conveying pipe (8) is connected to the uniform diffuser (9) inside the dust removal pipeline (1).

2. The ultra-low emission desulfurization system for coking waste gas according to claim 1, characterized in that: The desulfurizing agent grinding system includes a mill (5) and a material box (6) on top of it. The lower discharge port of the mill (5) is connected to a powder blower (7). The powder blower (7) transports the powder from the mill (5) along the conveying pipe (8) to a uniform diffuser (9) to mix with the flue gas.

3. The ultra-low emission desulfurization system for coking waste gas according to claim 1, characterized in that: The diffuser (9) includes a first diffuser cap (91), a second diffuser cap (92), and a third diffuser cap (93) whose areas gradually decrease along the conveying direction of the dust removal pipe (1).

4. The ultra-low emission desulfurization system for coking waste gas according to claim 3, characterized in that: The first diffuser cap (91), the second diffuser cap (92), and the third diffuser cap (93) are cone-shaped. The first diffuser cap (91) and the second diffuser cap (92) have through holes (94) of different sizes in the center. The through holes (94) are provided with flow guiding bends (95) at their edges.

5. The ultra-low emission desulfurization system for coking waste gas according to claim 4, characterized in that: The first diffusion cap (91) is connected and fixed to the outlet end of the delivery pipe (8) by multiple fixing rods (96), the edge of the second diffusion cap (92) is fixed to the outer end of the first diffusion cap (91) by multiple fixing rods (96), and the third diffusion cap (93) is connected to the outer end of the second diffusion cap (92) by multiple fixing rods (96).

6. The ultra-low emission desulfurization system for coking waste gas according to claim 1, characterized in that: The desulfurizing agent grinding system also includes an automatic control system, which includes a controller (10). The controller (10) is electrically connected to a dust sensor (12) installed in the dust removal pipe (1) and a control valve (11) installed on the conveying pipe (8). The controller (10) is also electrically connected to the drive motors of the air-powder blower (7) and the mill (5).

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