A deacidification washing system and a flue gas purification system
By introducing a staged structure of primary and secondary acid removal towers into the acid removal system, combined with co-current and counter-current contact methods, the gas-liquid mass transfer process is enhanced, solving the problem of reduced acid removal efficiency of single-stage acid removal towers when treating high-concentration acid gases, and improving the flue gas purification effect and system stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAICANG RONGLANG RENEWABLE RESOURCES CO LTD
- Filing Date
- 2025-07-02
- Publication Date
- 2026-05-29
AI Technical Summary
Existing single-stage deacidification towers suffer from reduced deacidification efficiency and difficulty in consistently meeting emission standards when handling high-concentration acidic gases or operating under strict emission limits.
The system employs a staged structure with a primary deacidification tower and a secondary deacidification tower. In the primary deacidification tower, the flue gas comes into contact with the alkaline solution in a co-current manner, while in the secondary deacidification tower, the gas comes into contact with the alkaline solution in a counter-current manner. Combined with a perforated plate and a demister, the gas-liquid mass transfer process is enhanced, and the alkaline solution concentration is optimized through a circulation loop, thus forming a staged deacidification treatment.
It improves the flue gas purification effect and system operation stability, solves the problem of reduced deacidification efficiency of traditional single-stage deacidification towers when treating high-concentration acid gases, and ensures that the composition of the outlet flue gas consistently meets the standards.
Smart Images
Figure CN224292920U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of waste gas treatment equipment, and in particular to an acid removal and washing system and a flue gas purification system. Background Technology
[0002] In the field of industrial flue gas treatment, the flue gas generated during processes such as incineration power generation and chemical production often contains acidic gases such as HCl, SOx, and HF. Direct emission of these gases would cause serious pollution to the atmospheric environment. To meet environmental protection requirements, the flue gas after dust removal needs to undergo deep acid removal treatment. Currently, setting up an acid removal scrubbing system after an activated carbon adsorption tower is a common treatment method. The acid removal scrubbing system generally absorbs acidic gases through alkaline spraying to purify the flue gas.
[0003] Existing acid removal and scrubbing systems mostly employ a single-stage acid removal tower structure, with multiple alkaline spray nozzles arranged inside the tower. When flue gas comes into contact with the sprayed alkaline solution inside the tower, acidic gases such as HCl, SOx, and HF, as well as particulate matter, are absorbed or captured. However, when faced with operating conditions of high acidic gas concentrations or strict environmental emission limits, the gas-liquid mass transfer process is limited, making it difficult for acidic gases to be fully absorbed. Especially during high-load operation, the acid removal efficiency will decrease significantly, resulting in the inability to consistently meet standards for components such as HCl and SOx in the outlet flue gas.
[0004] Therefore, the above problems urgently need to be solved. Utility Model Content
[0005] The purpose of this invention is to provide an acid removal and washing system and a flue gas purification system to improve the flue gas purification effect and system operation stability.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] A deacidification and scrubbing system includes a primary deacidification tower and a secondary deacidification tower connected in sequence, through which flue gas can flow sequentially;
[0008] The primary deacidification tower is equipped with multiple primary spray heads for spraying alkaline solution. The spraying direction of the primary spray heads is consistent with the flow direction of the flue gas in the primary deacidification tower, so as to achieve co-current contact between the flue gas and the alkaline solution.
[0009] The secondary deacidification tower is equipped with multiple secondary spray heads for spraying alkaline solution. The spraying direction of the secondary spray heads is opposite to the flow direction of the flue gas in the secondary deacidification tower, so as to achieve countercurrent contact between the flue gas and the alkaline solution.
[0010] Preferably, the multiple primary spray heads are arranged in layers along the vertical direction to form at least two spray zones, thereby extending the co-current contact path between the flue gas and the alkaline solution.
[0011] Preferably, the primary deacidification tower includes a primary flue gas inlet and a primary flue gas outlet, the primary flue gas inlet being located at the top of the primary deacidification tower, the primary flue gas outlet being located at the bottom of the primary deacidification tower, and a plurality of primary spray heads being located above the primary flue gas outlet.
[0012] Preferably, the secondary deacidification tower includes a secondary flue gas inlet and a secondary flue gas outlet, the secondary flue gas inlet is located at the bottom of the secondary deacidification tower, the secondary flue gas outlet is located at the top of the secondary deacidification tower, and a plurality of secondary spray heads are located above the secondary flue gas inlet.
[0013] Preferably, the primary deacidification tower is also equipped with a perforated plate, which has a number of perforated holes evenly distributed on it, so that the flue gas is separated into multiple streams and the flow rate is increased as it passes through the perforated holes.
[0014] Preferably, a demister is provided at the top of the secondary desulfurization tower, which is used to intercept liquid droplets in the flue gas.
[0015] Preferably, the demister includes a baffle assembly, a high-pressure flushing pipeline, and a flushing nozzle, wherein:
[0016] When the airflow passes through the baffle assembly, the droplets it carries will be retained and converge into the baffle assembly;
[0017] The high-pressure flushing pipeline is connected to an external clean water source to supply clean water;
[0018] The flushing nozzle is connected to the high-pressure flushing pipeline to flush the baffle assembly with clean water.
[0019] Preferably, the demister further includes a detection element for detecting the pressure difference between the inlet and outlet of the baffle assembly, and the flushing nozzle can be opened and closed according to the signal fed back by the detection element.
[0020] Preferably, a liquid storage tank is formed at the bottom of the primary deacidification tower;
[0021] The storage tank is used to collect the alkaline solution that comes into contact with the flue gas after being sprayed from the primary spray head and falls down, as well as the water condensed in the flue gas.
[0022] The storage tank is connected to multiple primary spray heads via a circulation pipeline to circulate the alkaline solution collected in the storage tank to the multiple primary spray heads.
[0023] A flue gas purification system includes an activated carbon adsorption tower, a chimney, and the aforementioned acid removal and scrubbing system, wherein the activated carbon adsorption tower, the acid removal and scrubbing system, and the chimney are connected in sequence via pipelines.
[0024] The activated carbon adsorption tower is used to adsorb pollutants in the flue gas output from the pollution-generating equipment. The deacidification and scrubbing system is used to receive the flue gas output from the activated carbon adsorption tower and deacidify it. The chimney is used to discharge the purified flue gas to the high altitude.
[0025] The beneficial effects of this utility model are:
[0026] This invention combines a primary deacidification tower and a secondary deacidification tower to form a staged deacidification treatment, which effectively solves the problem that traditional single-stage deacidification towers suffer from reduced deacidification efficiency and difficulty in achieving stable compliance of flue gas composition due to insufficient mass transfer when treating high-concentration acidic gases or under strict emission limits. This improves the flue gas purification effect and the stability of system operation. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the deacidification and washing system provided by this utility model;
[0028] Figure 2 This is a schematic diagram of the structure of the primary acid removal tower provided by this utility model;
[0029] Figure 3 This is a schematic diagram of the structure of the two-stage deacidification tower provided by this utility model.
[0030] In the picture:
[0031] 1. Primary deacidification tower; 11. Primary flue gas inlet; 12. Primary flue gas outlet; 2. Secondary deacidification tower; 21. Secondary flue gas inlet; 22. Secondary flue gas outlet; 3. Primary spray head; 4. Secondary spray head; 5. Perforated sieve plate; 6. Baffle assembly; 7. Liquid storage tank. Detailed Implementation
[0032] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.
[0033] In this application, the terms "comprising," "including," "having," 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 that element.
[0034] In this application, the term "and / or" describes a relationship between related objects, indicating that three relationships can exist. For example, a centrifugal vortex magnetic pump and / or a centrifugal vortex magnetic pump can represent: the existence of only one centrifugal vortex magnetic pump, the simultaneous existence of one centrifugal vortex magnetic pump and a centrifugal vortex magnetic pump, or the existence of only one centrifugal vortex magnetic pump. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.
[0035] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.
[0036] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values not using relative terms should also be disclosed as specific values with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.
[0037] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.
[0038] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.
[0039] Please see Figures 1 to 3 This embodiment provides an acid removal and scrubbing system, which includes a primary acid removal tower 1 and a secondary acid removal tower 2 connected in sequence. Flue gas can flow through the primary acid removal tower 1 and the secondary acid removal tower 2 in sequence. The primary acid removal tower 1 is equipped with multiple primary spray heads 3 for spraying alkaline solution. The spray direction of the primary spray heads 3 is consistent with the flow direction of the flue gas in the primary acid removal tower 1, so as to achieve co-current contact between the flue gas and the alkaline solution. The secondary acid removal tower 2 is equipped with multiple secondary spray heads 4 for spraying alkaline solution. The spray direction of the secondary spray heads 4 is opposite to the flow direction of the flue gas in the secondary acid removal tower 2, so as to achieve counter-current contact between the flue gas and the alkaline solution.
[0040] With this setup, the flue gas flows sequentially through the primary deacidification tower 1 and the secondary deacidification tower 2. In the primary deacidification tower 1, the primary spray head 3 sprays in the same direction as the flue gas flow, achieving co-current contact and performing preliminary deacidification and cooling of the flue gas. In the secondary deacidification tower 2, the secondary spray head 4 sprays in the opposite direction to the flue gas flow, achieving counter-current contact and further neutralizing the acidic components in the flue gas.
[0041] Understandably, the co-current contact of the primary acid removal tower 1 allows for rapid absorption of some acidic gases and a reduction in flue gas temperature, thus lowering the processing pressure of the secondary acid removal tower 2. The counter-current contact of the secondary acid removal tower 2 extends the contact time between the flue gas and the alkaline solution, resulting in more thorough mixing and enhanced gas-liquid mass transfer. The combination of these two processes forms a staged acid removal treatment, effectively solving the problem of decreased acid removal efficiency and difficulty in consistently meeting emission standards for outlet flue gas components caused by insufficient mass transfer in traditional single-stage acid removal towers under conditions of high-concentration acidic gas treatment or strict emission limits. This improves the flue gas purification effect and system operational stability.
[0042] To enhance the initial acid removal effect, multiple primary spray heads 3 are arranged vertically in layers, forming at least two spray zones to extend the co-current contact path between the flue gas and the alkaline solution. During the spraying process, the upper spray first contacts the high-concentration acidic flue gas, quickly neutralizing most of the strong acid gases such as HCl, causing the acidity of the flue gas to gradually decrease along the tower height. The lower spray continues to react with residual acidic components (such as SO2), thus avoiding the problem of excessively rapid local alkaline solution consumption and reaction efficiency decay caused by the instantaneous neutralization of high-concentration acidic gases with the alkaline solution in single-stage spraying. In addition, each time the flue gas passes through a spray zone, it reacts with new alkaline droplets, and the multi-layer arrangement is equivalent to multiple series contacts. For example, two spray layers can double the number of gas-liquid contacts, and even if the single contact time is short, the cumulative acid removal effect can be significantly improved. It should be noted that in this embodiment, multiple secondary spray heads 4 are also arranged vertically in layers, which will not be described in detail here.
[0043] Specifically, the primary desulfurization tower 1 includes a primary flue gas inlet 11 and a primary flue gas outlet 12. The primary flue gas inlet 11 is located at the top of the primary desulfurization tower 1, and the primary flue gas outlet 12 is located at the bottom of the primary desulfurization tower 1. Multiple primary spray heads 3 are located above the primary flue gas outlet 12. With this configuration, after the flue gas enters from the primary flue gas inlet 11 at the top of the primary desulfurization tower 1, it first undergoes free diffusion at the top (non-spray area) of the primary desulfurization tower 1, making the high-concentration acidic gas more evenly distributed within the cross-section of the primary desulfurization tower 1. Subsequently, when it enters the spray area, the uniform flue gas flow comes into contact with the alkaline droplets, avoiding the problem of excessively rapid local alkaline consumption near the flue gas inlet due to a sudden increase in concentration. More importantly, when the flue gas flows out from the primary flue gas outlet 12 at the bottom of the primary desulfurization tower 1, because the flow direction is consistent with the direction of droplet gravity, the unreacted alkaline droplets are more likely to settle to the bottom of the primary desulfurization tower 1 under gravity, rather than being carried to the flue gas outlet by the flue gas.
[0044] Furthermore, the secondary desulfurization tower 2 includes a secondary flue gas inlet 21 and a secondary flue gas outlet 22. The secondary flue gas inlet 21 is located at the bottom of the secondary desulfurization tower 2, and the secondary flue gas outlet 22 is located at the top of the secondary desulfurization tower 2. Multiple secondary spray heads 4 are located above the secondary flue gas inlet 21. With this configuration, as the flue gas flows upward from the bottom of the secondary desulfurization tower 2, the concentration of acidic gas decreases from high to low (due to gradual absorption), while the sprayed alkaline solution flows downward from above, with its concentration decreasing from high to low (due to consumption due to absorption of acidic gas). This ensures that the gas and liquid phases maintain a large concentration difference across all cross sections within the secondary desulfurization tower 2, and the mass transfer driving force remains at a high level. It can be understood that the upward flow of flue gas and the downward movement of alkaline droplets create relatively high-speed motion, generating strong turbulent disturbances within the secondary desulfurization tower 2, disrupting the boundary layer at the gas-liquid interface, and reducing mass transfer resistance.
[0045] To further improve the mass transfer efficiency in the deacidification process, a perforated plate 5 is installed in the primary deacidification tower 1. The perforated plate 5 has numerous evenly distributed perforations, allowing the flue gas to be separated into multiple streams and increasing the flow velocity. The perforation structure of the perforated plate 5 divides the single flue gas stream into multiple micro-streams, thereby increasing the contact interface between the flue gas and the alkaline solution. When the flue gas passes through the perforations, the originally continuous flow is divided into countless fine streams, resulting in a geometric increase in the number of gas-liquid contact points per unit volume, directly overcoming the bottleneck of limited mass transfer caused by insufficient gas-liquid contact area. Furthermore, according to fluid mechanics principles, the flue gas experiences an acceleration effect as the cross-sectional area narrows when passing through the perforations. When the high-speed gas stream encounters the sprayed alkaline droplets, it intensifies the droplet breakage and atomization, while also significantly increasing the turbulence intensity of the flue gas itself. This strong disturbance breaks the stagnant layer at the gas-liquid interface, significantly reducing the diffusion resistance of acidic gas molecules to the bulk alkaline solution. It should be noted that, in this embodiment, the secondary deacidification tower 2 is also equipped with the aforementioned perforated plate 5, which will not be described in detail here.
[0046] It should be noted that if incompletely evaporated alkali droplets or atomized droplets enter the subsequent induced draft fan or chimney with the flue gas, they will cause corrosion to the induced draft fan or chimney. To avoid this problem, a demister is installed at the top of the secondary deacidification tower 2 to intercept droplets in the flue gas. In this embodiment, the demister includes a baffle assembly 6, a high-pressure flushing pipeline, and flushing nozzles. When the airflow passes through the baffle assembly 6, the droplets it carries are retained and converged within the baffle assembly 6. The high-pressure flushing pipeline is connected to an external clean water source to supply clean water. The flushing nozzles are connected to the high-pressure flushing pipeline to flush the baffle assembly 6 with clean water.
[0047] The baffle assembly 6 typically employs a corrugated plate or labyrinth structure, forcing the flue gas to undergo multiple rapid turns as it passes through. Droplets, due to inertial forces exceeding the airflow drag, impact the plate wall and coalesce there. During the deacidification process, sulfate and chloride crystals generated from the reaction of alkaline solution and acidic gas easily deposit in the baffle assembly 6. Failure to remove these crystals promptly can lead to a reduction in the channel cross-sectional area and increased flue gas resistance. When the resistance of the baffle assembly 6 exceeds a threshold, flushing the baffle assembly 6 with a flushing nozzle improves the stability of continuous system operation. It should be noted that the specific models of the baffle assembly 6, high-pressure flushing pipeline, and flushing nozzle can be selected based on the actual application scenario; this embodiment does not impose specific requirements or limitations in this regard.
[0048] Specifically, the demister also includes a sensing element for detecting the pressure difference between the inlet and outlet of the baffle assembly 6. The flushing nozzles can open and close based on the signal fed back by the sensing element. It is understood that the pressure difference between the inlet and outlet of the baffle assembly 6 is strongly correlated with the degree of scaling. Controlling the opening and closing of the flushing nozzles based on the signal fed back by the pressure difference sensing element provides a better flushing effect than traditional timed flushing. It should be noted that the sensing element can be a capacitive or piezoresistive differential pressure transmitter, or a MEMS differential pressure sensor, which converts diaphragm deformation into an electrical signal. A strain gauge structure can also be used to detect the pressure difference; therefore, further details are omitted.
[0049] To achieve the recycling of alkali resources and cost optimization, a storage tank 7 is formed at the bottom of the primary deacidification tower 1. The storage tank 7 is used to collect the alkali solution that comes into contact with the flue gas and falls after being sprayed from the primary spray head 3, as well as the water condensed in the flue gas. The storage tank 7 is connected to multiple primary spray heads 3 through circulation pipelines to circulate the alkali solution collected in the storage tank 7 to the multiple primary spray heads 3.
[0050] Furthermore, in the circulation loop of the primary deacidification tower 1, a pH meter and a conductivity meter are connected in series in the circulation pipeline to monitor the acidity / alkalinity and ion concentration of the washing liquid in real time. When the pH meter feedback value is lower than the set range, the control system automatically opens the alkali solution filling valve to replenish the storage tank 7 with 30% concentration alkali solution to maintain the alkaline reaction environment; if the conductivity meter detects that the ion concentration exceeds the standard, it triggers the waste liquid discharge valve to discharge the high-concentration salt waste liquid and replenish it with fresh liquid. The two form a closed-loop control through real-time data feedback, accurately adjusting the alkali solution concentration and impurity content, avoiding the decrease in deacidification efficiency or equipment blockage caused by salt deposition due to insufficient alkali solution, ensuring stable operation of the circulation system in the high-efficiency reaction range, and working in conjunction with the collection and circulation function of the storage tank 7 to achieve dual optimization of alkali solution utilization efficiency and deacidification effect.
[0051] It should be noted that, in order to further realize the recycling of alkali resources and optimize costs, the secondary deacidification tower 2 is also equipped with the above-mentioned circulation loop, which will not be elaborated on further.
[0052] This embodiment also provides a flue gas purification system, which includes an activated carbon adsorption tower, a chimney, and the aforementioned acid removal and scrubbing system. The activated carbon adsorption tower, the acid removal and scrubbing system, and the chimney are connected sequentially via pipelines. The activated carbon adsorption tower is used to adsorb pollutants in the flue gas output from the polluting equipment. The acid removal and scrubbing system is used to receive the flue gas output from the activated carbon adsorption tower and perform acid removal treatment on it. The chimney is used to discharge the purified flue gas to high altitude. It can be understood that the exhaust gas purification system including the aforementioned bag filter improves the flue gas purification effect and system operational stability.
[0053] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A deacidification and washing system, characterized in that, It includes a primary deacidification tower (1) and a secondary deacidification tower (2) connected in sequence, through which flue gas can flow sequentially; The primary deacidification tower (1) is equipped with multiple primary spray heads (3) for spraying alkaline solution. The spraying direction of the primary spray heads (3) is consistent with the flow direction of the flue gas in the primary deacidification tower (1) so as to achieve co-current contact between the flue gas and the alkaline solution. The secondary deacidification tower (2) is equipped with multiple secondary spray heads (4) for spraying alkaline solution. The spraying direction of the secondary spray heads (4) is opposite to the flow direction of the flue gas in the secondary deacidification tower (2) so as to achieve countercurrent contact between the flue gas and the alkaline solution.
2. The deacidification and washing system according to claim 1, characterized in that, Multiple primary spray heads (3) are arranged in layers along the vertical direction to form at least two spray zones, thereby extending the co-current contact path between flue gas and alkaline solution.
3. The deacidification and washing system according to claim 2, characterized in that, The primary deacidification tower (1) includes a primary flue gas inlet (11) and a primary flue gas outlet (12). The primary flue gas inlet (11) is located at the top of the primary deacidification tower (1), and the primary flue gas outlet (12) is located at the bottom of the primary deacidification tower (1). A plurality of primary spray heads (3) are located above the primary flue gas outlet (12).
4. The deacidification and washing system according to claim 3, characterized in that, The secondary deacidification tower (2) includes a secondary flue gas inlet (21) and a secondary flue gas outlet (22). The secondary flue gas inlet (21) is located at the bottom of the secondary deacidification tower (2), and the secondary flue gas outlet (22) is located at the top of the secondary deacidification tower (2). A plurality of secondary spray heads (4) are located above the secondary flue gas inlet (21).
5. The deacidification and washing system according to claim 4, characterized in that, The primary deacidification tower (1) is also equipped with a perforated plate (5), on which a number of perforated holes are evenly distributed, so that the flue gas is separated into multiple streams and the flow rate is increased as it passes through the perforated holes.
6. The deacidification and washing system according to claim 1, characterized in that, A demister is installed at the top of the secondary deacidification tower (2), which is used to intercept liquid droplets in the flue gas.
7. The deacidification and washing system according to claim 6, characterized in that, The demister includes a baffle assembly (6), a high-pressure flushing pipeline, and a flushing nozzle, wherein: When the airflow passes through the baffle assembly (6), the droplets it carries will be retained and converge into the baffle assembly (6); The high-pressure flushing pipeline is connected to an external clean water source to supply clean water; The flushing nozzle is connected to the high-pressure flushing pipeline to flush the baffle assembly (6) with clean water.
8. The deacidification and washing system according to claim 7, characterized in that, The demister also includes a detection element for detecting the pressure difference between the inlet and outlet of the baffle assembly (6), and the flushing nozzle can be opened and closed according to the signal fed back by the detection element.
9. The deacidification and washing system according to claim 1, characterized in that, A liquid storage tank (7) is formed at the bottom of the primary deacidification tower (1); The storage tank (7) is used to collect the alkaline solution that comes into contact with the flue gas and falls after being sprayed from the first-stage spray head (3), as well as the water condensed in the flue gas; The storage tank (7) is connected to the multiple primary spray heads (3) through a circulation pipeline to circulate the alkaline solution collected in the storage tank (7) to the multiple primary spray heads (3).
10. A flue gas purification system, characterized in that, It includes an activated carbon adsorption tower, a chimney, and an acid removal and washing system as described in any one of claims 1-9, wherein the activated carbon adsorption tower, the acid removal and washing system, and the chimney are connected in sequence via pipelines; The activated carbon adsorption tower is used to adsorb pollutants in the flue gas output from the pollution-generating equipment. The deacidification and washing system is used to receive the flue gas output from the activated carbon adsorption tower and deacidify it. The chimney is used to discharge the purified flue gas to the high altitude.