Modularized rotary spraying absorption device for papermaking white mud flue gas desulfurization and use method

Abstract

The invention provides a modularized rotary spraying absorption device for papermaking white mud flue gas desulfurization and a use method, the modularized rotary spraying absorption device comprises a white mud pretreatment module, a rotary spraying desulfurization reaction module, a by-product sedimentation and recovery module and an intelligent control system, and through the integrated design of high-shear pulping, rotary spraying atomization, flow guide enhanced mass transfer, mud scraping separation and intelligent regulation and control, the desulfurization efficiency is improved; and high-efficiency desulfurization and by-product recycling by taking the papermaking white mud as the absorbent are realized. The system effectively solves the problems of dependence on high-quality limestone, complex system, easy blockage, high energy consumption and the like of the traditional desulfurization technology, has the advantages of compact structure, stable operation, high adaptability, convenience in modular deployment and the like, and is particularly suitable for medium and small-scale industrial flue gas desulfurization transformation and resource recycling scenes.

Description

Technical Field

[0001] This invention relates to the field of flue gas pollution control equipment technology, and in particular to a modular rotary jet absorption device for desulfurization of flue gas from papermaking sludge and its usage method. Background Technology

[0002] Traditional desulfurization technologies, such as the limestone-gypsum wet process, have advantages such as mature technology and stable efficiency. However, they are highly dependent on high-purity limestone, have complex equipment systems, are prone to slurry blockage, and operate under heavy loads. In particular, they exhibit significant disadvantages in energy consumption and by-product treatment under medium-to-low load fluctuations. At the same time, the annual output of white mud (containing CaCO3>70%), a by-product of the paper industry, is enormous. The current treatment method is mainly landfill, which not only occupies a large area and causes heavy pollution, but also fails to effectively utilize its potential alkaline resource attributes.

[0003] Although some studies have explored the application potential of white mud in flue gas desulfurization, most have remained at the stage of material modification or small-scale laboratory testing, lacking systematic and continuous engineering design and equipment integration. Therefore, existing technologies still have significant shortcomings in realizing the integration of white mud resource utilization and desulfurization equipment. An engineering solution that balances absorption performance, process integration, and operational control has not yet been formed, thus hindering the equipment-based and large-scale application of white mud from solid waste resources into a highly efficient desulfurization absorbent. Summary of the Invention

[0004] The purpose of this invention is to provide a modular rotary jet absorption device and its usage method for desulfurizing flue gas from papermaking sludge. The aim is to provide a modular and integrated rotary jet absorption device to achieve efficient resource utilization of papermaking sludge and solve the problems of high energy consumption, easy clogging, and difficulty in recovering by-products in traditional desulfurization systems.

[0005] According to one objective of the present invention, a modular rotary jet absorption device for desulfurization of flue gas from papermaking sludge is provided, comprising a sludge pretreatment module, a rotary jet desulfurization reaction module, a byproduct sedimentation and recovery module, and an intelligent control system connected in sequence; wherein, the sludge pretreatment module is used to prepare papermaking sludge into a uniform slurry; the rotary jet desulfurization reaction module is used to achieve efficient gas-liquid mass transfer reaction between flue gas and slurry; the byproduct sedimentation and recovery module is used for solid-liquid separation and resource-based output of desulfurization byproducts; and the intelligent control system is used to monitor and automatically adjust operating parameters.

[0006] Furthermore, the white mud pretreatment module includes a slurry preparation tank, which is equipped with a high-shear circulating pump, an automatic water replenishment system, and a pH adjustment device. The shear rate of the high-shear circulating pump is in the range of 10,000 to 20,000 rpm.

[0007] Furthermore, the slurry preparation tank is equipped with an online specific gravity sensor for real-time monitoring of slurry concentration.

[0008] Furthermore, the rotary jet desulfurization reaction module includes a desulfurization tower, which is equipped with a spiral guide vane and a multi-stage adjustable ceramic rotary jet nozzle; the spray particle size of the nozzle is in the range of 10~80μm.

[0009] Furthermore, the desulfurization tower is equipped with a three-stage liquid collection tray, and the tower body is made of stainless steel lined with polyethylene composite material.

[0010] Furthermore, the byproduct sedimentation and recovery module includes a conical sedimentation zone, which is equipped with a chain plate scraping system and a filter press output interface.

[0011] Furthermore, the conical settling zone is equipped with three levels of guide baffles.

[0012] Furthermore, the intelligent control system includes a PLC controller, an SO2 concentration sensor, a pH sensor, a flow sensor, and a temperature sensor, and supports automatic liquid-to-gas ratio adjustment and cloud data upload functions.

[0013] According to another objective of the present invention, the present invention provides a method for using the above-mentioned modular rotary jet absorber for desulfurization of flue gas from papermaking sludge, comprising the following steps: The papermaking sludge was prepared into a uniform slurry with the pH value controlled between 5.5 and 6.5. The slurry is atomized and sprayed into the desulfurization tower through a rotary nozzle, where it reacts with the flue gas in a counter-current flow. Desulfurization byproducts are discharged and utilized after sedimentation, sludge scraping, and pressure filtration. The intelligent control system monitors SO2 concentration, slurry specific gravity, flow rate and temperature in real time, and automatically adjusts the liquid-to-gas ratio.

[0014] Furthermore, the desulfurization byproduct is a mixture of CaSO3 and CaSO4.

[0015] This invention's technical solution, through an integrated modular design, achieves highly efficient and coordinated operation across the entire process of papermaking sludge, from pretreatment and desulfurization reaction to byproduct recovery, significantly improving desulfurization efficiency and resource utilization. The device has a compact structure, is easy to install and maintain, and is particularly suitable for the retrofitting of small and medium-sized industrial scenarios. The intelligent control system enables real-time monitoring and automatic adjustment of operating parameters, ensuring stable system operation and reducing energy consumption and labor costs. The overall system combines multiple advantages, including high-efficiency desulfurization, solid waste resource utilization, and intelligent management, resulting in significant economic and environmental benefits. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention; In the diagram: 1. Slurry preparation tank; 2. Desulfurization tower; 3. Spiral guide vane; 4. Nozzle; 5. Conical settling zone. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, 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 limiting this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Example 1 like Figure 1As shown, a modular rotary jet absorption device for desulfurization of flue gas from papermaking sludge includes a sludge pretreatment module, a rotary jet desulfurization reaction module, a byproduct sedimentation and recovery module connected in sequence, and an integrated intelligent control system; wherein: White mud pretreatment module: used for slurry preparation and uniform dispersion; Rotary jet desulfurization reaction module: enhances gas-liquid mass transfer reaction; Byproduct sedimentation and recovery module: realizes solid-liquid separation and resource-based output; Intelligent control system: enables monitoring and automatic adjustment of operating parameters.

[0022] Specifically, the white mud pretreatment module includes a slurry preparation tank 1, which is equipped with a high-shear circulating pump, an automatic water replenishment system, and a pH adjustment device to ensure uniform and stable slurry. The slurry preparation tank 1 is equipped with an online specific gravity sensor. The high-shear circulating pump has a shear rate range of 10,000 to 20,000 rpm.

[0023] like Figure 1 As shown, specifically, the rotary jet desulfurization reaction module includes a desulfurization tower 2. The desulfurization tower 2 is equipped with spiral guide vanes 3 and multi-stage adjustable ceramic rotary jet nozzles 4 to enhance gas-liquid contact and reaction efficiency. The spray particle size range of the multi-stage adjustable ceramic rotary jet nozzles is 10~80 μm. The desulfurization tower 2 is made of stainless steel lined with polyethylene composite material. A three-stage liquid collection tray is provided inside the desulfurization tower.

[0024] like Figure 1 As shown, specifically, the by-product settling and recovery module includes a conical settling zone 5, which is equipped with a chain plate scraping system and a filter press output interface to achieve automatic separation and resource utilization of by-products. The conical settling zone is equipped with three-stage guide baffles. The chain plate scraping system adopts a clogging-free rotary rake structure.

[0025] The intelligent control system includes a PLC controller, an SO2 concentration sensor, a pH sensor, a flow sensor, and a temperature sensor. It supports automatic liquid-to-gas ratio adjustment and cloud data upload capabilities. Furthermore, it supports interconnection with DCS or LCA systems to achieve closed-loop control and remote monitoring.

[0026] The device of this invention is a modular slide rail assembly structure.

[0027] The method of using the above-mentioned modular rotary jet absorption device for desulfurization of flue gas from papermaking white mud includes the following steps: The papermaking slurry was prepared into a uniform slurry. The slurry is atomized and sprayed into the desulfurization tower through a rotary nozzle; Flue gas and slurry come into countercurrent contact inside the tower to carry out the desulfurization reaction; By-products are discharged and utilized after sedimentation, sludge scraping, and filter pressing. Operating parameters are monitored and adjusted in real time through an intelligent control system.

[0028] Specifically, the pH value of the slurry is controlled between 5.5 and 6.5 through automatic replenishment and pH adjustment pump.

[0029] The liquid-to-gas ratio is automatically adjusted in real time based on the SO2 concentration.

[0030] The byproduct is a mixture of CaSO3 / CaSO4, which is used as filler in building materials or as filling material in mines.

[0031] This invention has the advantages of compact structure, stable operation, low energy consumption, high by-product resource utilization rate, and strong adaptability, and is particularly suitable for small and medium-sized industrial desulfurization retrofit projects.

[0032] Example 2 like Figure 1 As shown, the structure of this embodiment is basically the same as that of Embodiment 1. This embodiment is a modular rotary jet absorption device for desulfurization of flue gas from papermaking white mud, comprising: White mud pretreatment module: used to convert industrial by-product white mud powder into a reaction slurry with uniform particle size and excellent dispersibility. It includes slurry preparation tank 1, which contains an automatic water replenishment pump, a pH adjustment pump and an online specific gravity sensor. At the same time, a high-shear circulation pump is set to maintain the uniformity of slurry suspension and avoid slurry agglomeration and scaling.

[0033] The rotary jet desulfurization reaction module includes a desulfurization tower 2, which is equipped with a spiral guide 3 and a three-stage liquid collection tray. The rotation of the fluid enhances the contact between the flue gas disturbance and the slurry spray. The nozzle 4 adopts a multi-stage adjustable ceramic rotary jet structure, which has the functions of quick disassembly and anti-clogging. The tower body adopts a stainless steel / polyethylene lining design, which is corrosion resistant and easy to maintain.

[0034] By-product settling and recovery module: including conical settling zone 5, which is equipped with a liquid-solid separation sludge scraping system and a by-product transportation interface. The generated CaSO3 / CaSO4 solids can be directly supplied to building material fillers or mine filling materials; the by-product transportation adopts a non-clogging rotary rake structure to realize online pressure filtration pretreatment.

[0035] Control and Data Acquisition System: The embedded PLC automatic adjustment system integrates SO2 concentration, conductivity, flow rate and temperature monitoring functions, and has cloud data upload capabilities. It can be connected to the enterprise LCA system or environmental protection platform for intelligent supervision and operation assessment.

[0036] In this embodiment, all fluid connectors are quick-connect and quick-release connectors, ceramic cores are recommended for nozzles to improve wear resistance, and fiberglass or corrosion-resistant stainless steel lined tower body is recommended to adapt to corrosive environments.

[0037] In this invention, the shear rate range (10,000~20,000 rpm) of the high-shear disperser ensures slurry dispersion and prevents sedimentation, which is a key parameter for maintaining stable system operation.

[0038] In this invention, the adjustable multi-hole rotary nozzle (particle size 10~80μm, quick assembly and disassembly) is an identifiable structural technical feature and a core embodiment of anti-clogging and multi-condition compatibility.

[0039] In this invention, the desulfurization tower uses a stainless steel-lined polyethylene composite material, which clearly defines the material composition and improves corrosion resistance, giving it an advantage over traditional PVDF materials.

[0040] In this invention, the by-product zone is equipped with a three-stage flow guide baffle and chain plate sludge scraping system structure to improve solid-liquid separation efficiency and avoid scaling and clogging during operation.

[0041] In this invention, the control system realizes automatic adjustment of the liquid-gas ratio driven by SO2 concentration and periodic carbon factor recording, thereby enhancing intelligent operation capabilities and carbon footprint monitoring functions.

[0042] This invention is based on the modular desulfurization system design of white mud absorbent, realizing the coupling of the whole process of "pulping pretreatment - rotary jet reaction - by-product recovery - intelligent monitoring". It is the first system integration solution for papermaking white mud desulfurization device for engineering scenarios.

[0043] This invention employs a slurry pretreatment module with high-shear circulating dispersion and automatic liquid replenishment to prevent the agglomeration and sedimentation of white mud particles, ensure slurry fluidity and uniformity, and improve spray quality and reaction efficiency.

[0044] This invention employs a desulfurization tower design combining multi-stage adjustable ceramic swirl nozzles and a spiral flow guiding structure, which enhances flue gas disturbance and gas-liquid mass transfer efficiency, and has anti-clogging, quick disassembly, and multi-condition adaptability capabilities, thereby improving the continuous operation stability of the system.

[0045] This invention adopts an integrated recycling structure of by-product sedimentation, sludge scraping and conveying, and pressure filtration to realize the automatic separation and resource utilization of desulfurization by-products (white mud-gypsum mixture), which can be directly used as building material filler or mine filling material.

[0046] This invention relates to an intelligent control system based on SO2 concentration feedback, which integrates PLC, adaptive liquid-to-gas ratio adjustment, cloud data upload, and DCS interface to achieve closed-loop control and remote scheduling.

[0047] In summary, this invention addresses the problems of high energy consumption, system complexity, slurry clogging, and low byproduct utilization efficiency in existing limestone wet desulfurization systems. By constructing a modular and integrated rotary jet absorption device, this invention achieves efficient resource utilization of white mud, an alkaline industrial solid waste. Through high-shear circulating dispersion and automatic replenishment technology, slurry stability and spray quality are significantly improved, avoiding slurry deposition and scaling problems, and fundamentally enhancing the reliability and maintainability of continuous system operation.

[0048] This invention features a multi-stage adjustable ceramic swirl nozzle and spiral flow guiding structure inside the desulfurization reaction tower, enhancing flue gas turbulence and gas-liquid interface renewal frequency, significantly improving SO2 absorption efficiency. The tower body is made of corrosion-resistant composite materials, adaptable to highly acidic conditions, and possesses excellent durability and low maintenance costs. Simultaneously, the by-product sedimentation, sludge scraping, and pressure filtration recovery structures are integrated into one unit, enabling efficient separation and stable output of white mud-gypsum by-products, providing a reliable pathway for the on-site utilization of by-product resources.

[0049] Furthermore, the intelligent control system integrated into the device of this invention has functions such as SO2 concentration monitoring, spray pressure control, slurry specific gravity feedback, and liquid-gas ratio self-adjustment. It supports interconnection with the plant's DCS system or cloud platform to achieve closed-loop control and remote intelligent management of the desulfurization process. The overall structure is compact, with slide rail assembly, facilitating deployment and maintenance. It is particularly suitable for desulfurization retrofitting in resource-constrained areas and small-to-medium-sized operating scenarios, taking into account both environmental governance and resource recycling objectives.

[0050] This invention integrates white mud pretreatment, rotary jet enhanced reaction, by-product recovery and automatic control. It is suitable for high-concentration SO2 emission scenarios such as coal-fired power plants, municipal solid waste incineration plants, glass manufacturing, and building material roasting kilns. It features high adaptability, high resource utilization rate and low operating energy consumption, and is especially suitable for promotion and application in resource-constrained industrial areas and small and medium-sized desulfurization retrofit projects.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modular rotary jet absorption device for desulfurization of flue gas from papermaking white mud, characterized in that, The system includes a white mud pretreatment module, a rotary jet desulfurization reaction module, a byproduct sedimentation and recovery module, and an intelligent control system, all connected in sequence. The white mud pretreatment module prepares papermaking white mud into a uniform slurry. The rotary jet desulfurization reaction module achieves efficient gas-liquid mass transfer between flue gas and slurry. The byproduct sedimentation and recovery module separates the solid and liquid components of the desulfurization byproducts and enables their resource-based output. The intelligent control system monitors and automatically adjusts operating parameters.

2. The modular rotary jet absorption device for desulfurization of flue gas from papermaking sludge according to claim 1, characterized in that, The white mud pretreatment module includes a slurry preparation tank, which is equipped with a high-shear circulating pump, an automatic water replenishment system, and a pH adjustment device. The shear rate of the high-shear circulating pump is in the range of 10,000 to 20,000 rpm.

3. The modular rotary jet absorption device for desulfurization of flue gas from papermaking sludge according to claim 2, characterized in that, The slurry preparation tank is equipped with an online specific gravity sensor for real-time monitoring of slurry concentration.

4. The modular rotary jet absorption device for desulfurization of flue gas from papermaking sludge according to claim 1, characterized in that, The rotary jet desulfurization reaction module includes a desulfurization tower, which is equipped with a spiral guide vane and a multi-stage adjustable ceramic rotary jet nozzle; the spray particle size of the nozzle is in the range of 10~80μm.

5. The modular rotary jet absorption device for desulfurization of flue gas from papermaking sludge according to claim 4, characterized in that, The desulfurization tower is equipped with a three-stage liquid collection tray, and the tower body is made of stainless steel lined with polyethylene composite material.

6. The modular rotary jet absorption device for desulfurization of flue gas from papermaking white mud according to claim 1, characterized in that, The by-product sedimentation and recovery module includes a conical sedimentation zone, which is equipped with a chain plate scraping system and a filter press output interface.

7. The modular rotary jet absorption device for desulfurization of flue gas from papermaking sludge according to claim 6, characterized in that, The conical settling zone is equipped with three levels of flow-guiding baffles.

8. The modular rotary jet absorption device for desulfurization of flue gas from papermaking white mud according to claim 1, characterized in that, The intelligent control system includes a PLC controller, an SO2 concentration sensor, a pH sensor, a flow sensor, and a temperature sensor, and supports automatic adjustment of the liquid-to-gas ratio and cloud data upload functions.

9. The method of using the modular rotary jet absorption device for desulfurization of flue gas from papermaking white mud according to any one of claims 1 to 8, characterized in that, Includes the following steps: The papermaking sludge was prepared into a uniform slurry with the pH value controlled between 5.5 and 6.

5. The slurry is atomized and sprayed into the desulfurization tower through a rotary nozzle, where it reacts with the flue gas in a counter-current flow. Desulfurization byproducts are discharged and utilized after sedimentation, sludge scraping, and pressure filtration. The intelligent control system monitors SO2 concentration, slurry specific gravity, flow rate and temperature in real time, and automatically adjusts the liquid-to-gas ratio.

10. The method of using the modular rotary jet absorption device for desulfurization of flue gas from papermaking white mud according to claim 9, characterized in that, The desulfurization byproduct is a mixture of CaSO3 and CaSO4.

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