Seawater desulfurization system and method thereof

Abstract

The invention discloses a seawater desulfurization system and method, and relates to the technical field of flue gas desulfurization, and the seawater desulfurization system comprises a tower body, an inlet flue gas treatment assembly, a multi-stage reaction assembly and a liquid supply assembly. Wherein the tower body comprises a smoke inlet and a smoke outlet, and the smoke inlet and the smoke outlet are arranged corresponding to the upper end and the lower end of the tower body respectively, so that a smoke channel from bottom to top is formed in an inner cavity of the tower body; the flue gas inlet treatment assembly comprises a gas inlet flue and a first spraying part, the gas inlet flue is arranged at the flue gas inlet and extends towards the outer side of the tower body, and the first spraying part is mounted in the gas inlet flue and used for cooling and pre-removing flue gas; compared with the traditional desulfurization tower structure, the multistage desulfurization structure provided by the invention has the advantages that the tower diameter can be effectively reduced by about 5%, the filler is protected, the service life is prolonged by 10-20%, the load of the demister is reduced, the size of the demister is reduced, the pressure drop of the whole tower can be reduced by about 5%, the power consumption can be saved by about 10-20%, and the desulfurization tower is more efficient and more stable in operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of flue gas desulfurization technology, in particular to a seawater desulfurization system and method thereof. BACKGROUND

[0002] Seawater desulfurization is an environmental protection technology that uses natural seawater as an absorbent to remove sulfur dioxide (SO2) in industrial flue gas. This technology is mainly applied to emission sources such as coastal coal-fired power plants, oil refineries, and ships, and is a mature desulfurization technology and one of the main technologies in the current flue gas purification field.

[0003] The core mechanism of seawater desulfurization technology is based on the natural alkalinity of seawater. Natural seawater contains a large amount of soluble salts, the main components of which are chlorides and sulfates, and also contains a certain amount of soluble carbonates, which are usually alkaline. This characteristic gives seawater natural acid-base buffering capacity and SO2 absorption capacity. In the desulfurization process, flue gas and seawater are countercurrently contacted in the desulfurization tower, and SO2 in the flue gas is absorbed by seawater to form sulfite ions, and then air is blown into the aeration tank to oxidize the sulfite ions into stable sulfate ions, while restoring the pH of the seawater.

[0004] Seawater desulfurization technology has the advantages of simple absorbent, no by-products, high desulfurization efficiency, and low operating cost. However, the desulfurization tower, as the most core equipment, needs to be made of corrosion-resistant alloy due to the corrosiveness of seawater, resulting in high initial investment cost. Moreover, the high salt content in seawater can easily cause the tray and demister to be fouled and clogged. As the core area of absorption, the filler layer is also easily damaged and causes the desulfurization capacity to decrease due to the action of seawater and high-temperature flue gas during long-term operation. SUMMARY

[0005] The main purpose of the present application is to provide a seawater desulfurization system and method, which aims to solve the problem of high operating cost caused by high replacement frequency of internal structural parts of the traditional seawater desulfurization system.

[0006] To achieve the above-mentioned purpose, the seawater desulfurization system provided by the present application comprises: a tower body comprising an inlet smoke port and an outlet smoke port, the outlet smoke port and the inlet smoke port being respectively arranged at the upper and lower ends of the tower body to form a flue gas passage in the inner cavity of the tower body from bottom to top; a flue gas inlet treatment assembly comprising a flue gas inlet duct and a first spray part, the flue gas inlet duct being arranged outside the tower body and extending from the inlet smoke port, and the first spray part being installed in the flue gas inlet duct for cooling and pre-removing flue gas; a multi-stage reaction assembly arranged in the inner cavity of the tower body corresponding to the flue gas passage in stages to form a multi-stage desulfurization reaction in the tower body; and A liquid supply assembly is connected to the first spray section and the multi-stage reaction assembly for supplying seawater to the first spray section and the multi-stage reaction assembly.

[0007] In an embodiment, the air inlet chimney comprises a mounting end and an air inlet end, the mounting end is connected to the air inlet, the first spray section is arranged at a position between the mounting end and the air inlet end, and temperature monitoring devices are arranged on both the air inlet end and the mounting end. A demisting assembly is further arranged on the inner wall of the air outlet.

[0008] In an embodiment, the air inlet chimney is arranged in an inclined manner, and the air inlet chimney extends from the mounting end to the air inlet end in a direction from the bottom of the tower body to the top of the tower body. The first spray section comprises a plurality of spray units, the plurality of spray units are arranged on the inner wall of the air inlet chimney in an interval manner in the extending direction of the air inlet chimney, and the opening degrees of the plurality of spray units are adjustable.

[0009] In an embodiment, the multi-stage reaction assembly comprises a middle spray structure, the middle spray structure comprises: A flow regulation section is arranged on the inner wall of the tower body above the air inlet for regulating the flow of flue gas; and A second spray section is arranged on the inner wall of the tower body above the flow regulation section.

[0010] In an embodiment, the multi-stage reaction assembly comprises a high spray structure, the high spray structure comprises: A filler layer is arranged on the inner wall of the tower body above the second spray section; and A third spray section is arranged on the inner wall of the tower body above the filler layer.

[0011] In an embodiment, the liquid supply assembly comprises: A seawater storage pool for storing seawater; A liquid inlet pipe assembly comprising a plurality of branch pipes and a main pipe, the plurality of branch pipes are connected to one end of the main pipe, the other ends of the plurality of branch pipes are respectively connected to the first spray section and the multi-stage reaction assembly, and flow regulating units are arranged on the plurality of branch pipes; and A pumping assembly comprising a pumping pipe and a pump body, the pumping pipe is arranged between the seawater storage pool and the main pipe, and the pump body is arranged on the pumping pipe.

[0012] In an embodiment, the liquid supply assembly further comprises a siphon connected to the liquid inlet end of the pre-accumulation pool for introducing seawater into the pre-accumulation pool, and the pre-accumulation pool and the lower end cavity of the tower body are connected to the aeration tank; and / or, The pumping assembly is provided in at least two.

[0013] The application further provides a seawater desulfurization method based on the seawater desulfurization system, which comprises the following steps: Pretreating the flue gas by seawater at the flue gas inlet of the tower body; Carrying out multi-stage desulfurization on the flue gas along the axial direction of the tower body; Discharging the gas and waste liquid generated by desulfurization after treatment.

[0014] In an embodiment, the pretreatment of the flue gas by seawater at the flue gas inlet of the tower body comprises: Setting a mapping control relationship between the opening degrees of the plurality of spray units on the gas inlet flue and the flue gas temperatures and the flue gas amounts at both ends of the gas inlet flue; Supplying seawater to the plurality of spray units by the liquid supply assembly; Obtaining the actual flue gas amount of the gas inlet flue and the actual temperature values of the flue gas at the positions of both ends of the gas inlet flue to obtain actual flue gas parameters; Adjusting the actual opening degrees of the plurality of spray units in real time by the actual flue gas parameters and the mapping control relationship.

[0015] In an embodiment, the multi-stage desulfurization of the flue gas along the axial direction of the tower body comprises: Dividing the tower body into a second absorption zone and a third absorption zone corresponding to the second spray part and the third spray part; Real-time monitoring the sulfur content and the actual temperature of the flue gas in the second absorption zone and the third absorption zone to form dynamic monitoring data; Adjusting the real-time spraying amounts of the second spray part and the third spray part in real time according to the dynamic monitoring data.

[0016] The application gradually absorbs and reduces the flue gas temperature and the sulfur content by setting three-layer spray absorption zones. Compared with the conventional desulfurization tower, the inlet flue gas temperature can be reduced by 30-60℃, the tower diameter can be effectively reduced by about 5%, the filler life can be prolonged by 10-20%, the demister load can be reduced, the demister size can be reduced, the total tower pressure drop can be reduced by about 5%, the power consumption can be saved by about 10-20%, and the desulfurization tower can be more efficiently and stably operated. BRIEF DESCRIPTION OF DRAWINGS

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the seawater desulfurization system and method provided by the present invention; Figure 2 For based on Figure 1 A schematic diagram of the seawater desulfurization method in a China-based seawater desulfurization system; Figure 3 for Figure 2 A detailed flowchart of an embodiment of "pre-treatment of flue gas by seawater at the flue gas inlet of the tower body"; Figure 4 for Figure 2 A detailed flowchart of one embodiment of "multi-stage desulfurization of flue gas along its axial direction within the tower body".

[0019] Explanation of icon numbers: 100. Seawater desulfurization system; 1. Tower body; 11. Flue gas inlet; 12. Flue gas outlet; 121. Demisting component; 2. Flue gas treatment component; 21. Air inlet flue; 211. Installation end; 212. Air inlet end; 2121. Temperature monitoring device; 22. First spray section; 3. Multi-stage reaction component; 31. Mid-level spray structure; 311. Rectifier section; 312. Second spray section; 32. High-level spray structure; 321. Packing layer; 322. Third spray section; 4. Liquid supply component; 41. Liquid inlet pipe component; 411. Branch pipe; 4111. Flow regulation unit; 412. Main pipe; 42. Pumping component; 421. Pumping pipe; 422. Pump body; 43. Siphon well; 44. Aeration tank; 45. Water storage forebay.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, motion condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0023] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B are satisfied at the same time. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0024] Seawater desulfurization is an environmental protection technology that uses natural seawater as an absorbent to remove sulfur dioxide (SO2) in industrial flue gas. This technology is mainly applied to emission sources such as coastal coal-fired power plants, oil refineries, and ships, and is a mature desulfurization technology and one of the main technologies in the current flue gas purification field.

[0025] The core mechanism of seawater desulfurization technology is based on the natural alkalinity of seawater. Natural seawater contains a large amount of soluble salt, the main components are chlorides and sulfates, and also contains a certain amount of soluble carbonates, which is usually alkaline. This characteristic makes seawater have natural acid-base buffering capacity and SO2 absorption capacity. In the desulfurization process, flue gas and seawater are countercurrently contacted in the desulfurization tower, and SO2 in the flue gas is absorbed by seawater to generate sulfite ions, and then air is blown into the aeration tank to oxidize the sulfite to stable sulfate ions, and restore the pH value of seawater.

[0026] Seawater desulfurization technology has the advantages of simple absorbent, no by-product, high desulfurization efficiency, and low operating cost. However, the desulfurization tower, as the most core equipment, needs to be made of corrosion-resistant alloy due to the corrosiveness of seawater, which has a high initial investment cost. And the high salt content of seawater can easily cause the tray and demister to be fouled and blocked. As the core area of absorption, the filler layer is also easily damaged and causes the desulfurization capacity to decrease due to the action of seawater and high-temperature flue gas during long-term operation.

[0027] The present application provides a seawater desulfurization system 100.

[0028] Please refer to Figure 1 In an embodiment of the present application, the seawater desulfurization system 100 comprises a tower body 1, an inlet flue gas treatment assembly 2, a multi-stage reaction assembly 3 and a liquid supply assembly 4. The tower body 1 comprises an inlet flue gas port 11 and an outlet flue gas port 12, which are respectively arranged at the upper and lower ends of the tower body 1 to form a flue gas passage in the inner cavity of the tower body 1. The inlet flue gas treatment assembly 2 comprises an inlet flue gas duct 21 and a first spraying part 22. The inlet flue gas duct 21 is arranged at the inlet flue gas port 11 and extends to the outside of the tower body 1. The first spraying part 22 is installed in the inlet flue gas duct 21 to cool and pre-remove the flue gas. The multi-stage reaction assembly 3 is arranged in the inner cavity of the tower body 1 corresponding to the flue gas passage to form a multi-stage desulfurization reaction in the tower body 1. The liquid supply assembly 4 is connected to the first spraying part 22 and the multi-stage reaction assembly 3 to supply seawater to the first spraying part 22 and the multi-stage reaction assembly 3.

[0029] In this embodiment, the liquid supply assembly 4 is the main seawater supply structure. It can pump seawater to the first spraying part 22 at the inlet flue gas duct 21 and the multi-stage reaction assembly 3 in the tower body 1. Thus, the flue gas can be desulfurized by the acid-base buffering capacity of seawater at the first spraying part 22 and the multi-stage reaction assembly 3.

[0030] Specifically, the inlet flue gas port 11 is arranged on the side wall structure near the lower end of the tower body 1, and the outlet flue gas port 12 is arranged at the upper end of the tower body 1. The flue gas enters the inner cavity of the tower body 1 from the inlet flue gas duct 21 and the inlet flue gas port 11 and flows to the outlet flue gas port 12 of the tower body 1, thereby forming a flue gas passage from bottom to top in the tower body 1. It should be noted that in this embodiment, the first spraying part 22 is arranged at the inlet flue gas duct 21, that is, the flue gas is pretreated before entering the inner cavity of the tower body 1, which includes the initial reaction of flue gas and seawater, and most importantly, the seawater output by the first spraying part 22 can also cool the flue gas entering the tower body 1. In actual process, the above-mentioned method can effectively reduce the inlet temperature of 30-60℃. The decrease of the inlet temperature can further reduce the reaction temperature of the flue gas in the tower body 1, thereby prolonging the service life of the multi-stage reaction assembly 3 and effectively reducing the cost investment in the production process.

[0031] Furthermore, as mentioned above, the multi-stage reaction assembly 3 is provided on the flue gas guide path of the flue gas passage. As its name suggests, the multi-stage reaction assembly 3 has the effect of multi-stage treatment of the flue gas. Combined with the first spray section 22 at the flue gas inlet channel, multiple desulfurization treatment structures are formed on the entire tower body 1, allowing for layer-by-layer desulfurization of the flue gas using seawater. Through the synergistic effect of these multiple desulfurization structures, highly efficient desulfurization of the flue gas can be achieved.

[0032] Furthermore, the entire desulfurization unit uses seawater as the raw material for the desulfurization reaction. Compared with the traditional high-temperature desulfurization method, its energy consumption is relatively small, the raw materials are readily available, and no by-products are generated, which has its unique advantages.

[0033] In some embodiments, such as Figure 1 As shown, the air intake flue 21 includes an installation end 211 and an air intake end 212. The installation end 211 is connected to the smoke inlet 11. The first spray section 22 is located at the middle position between the installation end 211 and the air intake end 212. Temperature monitoring devices 2121 are provided on both the air intake end 212 and the installation end 211.

[0034] The installation end 211 is the actual installation structure of the air intake flue 21. As mentioned above, the air intake flue 21 extends to the outside of the tower body 1 at the smoke inlet 11 to form a certain length. In actual production, in order to ensure the treatment effect of the first spray section 22 on the flue gas in the air intake flue 21, it is necessary to consider the combined design of the flue gas flow velocity and the flue length, so that the reaction time of the flue gas in the air intake flue 21 is not less than 0.2 seconds.

[0035] The first spray section 22 includes multiple spray units. To further enhance the reaction effect between seawater and flue gas at the intake flue 21, preferably, the multiple spray units are spaced apart on the inner wall of the intake flue 21 along its extension direction. Installing multiple spray units in this manner effectively improves the reaction effect between the flue gas and seawater at the intake flue 21 and ensures that the flue gas meets the aforementioned cooling rate as it moves into the tower body 1.

[0036] Furthermore, the opening degree of each of the multiple spray units can be adjusted. As mentioned above, a temperature monitoring device 2121 is provided at both the installation end 211 and the air inlet end 212 of the air inlet flue 21. The temperature monitoring device 2121 can determine the temperature drop of the flue gas after passing through the air inlet flue 21. The temperature drop of the flue gas can be adjusted by adjusting the opening degree of the multiple spray units. In actual production, the above-mentioned feedback control can further improve the reaction stability of the flue gas in the tower body 1 and the air inlet flue 21.

[0037] Of course, it is conceivable that the longer the extension length of the air inlet flue 21 is, the more advantageous the temperature reduction of the flue gas is, but in actual production, the actual specifications of the entire system also need to be combined to set, the longer the air inlet flue 21 is, the floor space is also improved accordingly, and the actual setting structure of the first spraying part 22 also needs to be changed accordingly, so it is not that the longer the length of the air inlet flue 21 is, the better.

[0038] The flue gas treated by desulfurization in the tower body 1 is discharged at the smoke outlet 12, and a demisting assembly 121 is also arranged on the inner wall of the smoke outlet 12. Thus, the dryness of the discharged flue gas can be ensured.

[0039] In some embodiments, as shown in Figure 1 The air inlet flue 21 is inclined and extends from the mounting end 211 to the air inlet end 212 in the direction from the bottom to the top of the tower body 1.

[0040] In this embodiment, the air inlet flue 21 is preferably arranged in an inclined manner. Through the above inclined arrangement, the lower part of the air inlet flue 21 is connected to the inner cavity of the tower body 1. In actual reaction, the flue gas and seawater react in the air inlet flue 21, and the water after the reaction can flow into the inner cavity of the tower body 1 at the bottom position for collection. Since the flue gas is relatively high in temperature and has a certain pressure when discharged, it will not affect the flow effect of the flue gas into the inner cavity of the tower body 1.

[0041] Of course, it is conceivable that the air inlet flue 21 can also be arranged in a straight line, or can be arranged in a composite flue structure of straight line and curve. As long as the above reaction requirements are met, the air inlet flue 21 can be arranged according to the actual situation, and the actual cross-sectional shape of the air inlet flue 21 is not limited, and can be designed according to requirements.

[0042] In some embodiments, as shown in Figure 1 The multi-stage reaction assembly 3 includes a middle spraying structure 31, and the middle spraying structure 31 includes a flow regulating part 311 and a second spraying part 312. The flow regulating part 311 is arranged on the inner wall of the tower body 1 above the flue gas inlet 11 for regulating the flue gas. The second spraying part 312 is arranged on the inner wall of the tower body 1 above the flow regulating part 311.

[0043] The middle spray assembly is arranged at the middle position of the tower body 1 and corresponds to the path of the flue gas passage. The flue gas entering the tower body 1 through the gas inlet flue 21 moves upward in the tower body 1, first passes through the flow regulating portion 311, which can regulate the flow of flue gas, so that the flue gas can flow uniformly upward. The second spray portion 312 is arranged at the upper position of the flow regulating portion 311, which, like the first spray portion 22, includes a plurality of spray units with adjustable opening degree. The plurality of spray units are preferably arranged uniformly in the horizontal cross section of the tower body 1, so as to form a mesh spray structure. After the flue gas moving upward passes through the flow regulating portion 311 for regulation, it can be uniformly dispersed in the cross section of the tower body 1 as much as possible and move upward. At this time, the plurality of spray units spray seawater at the same time, which can enhance the contact reaction effect of seawater and flue gas, thereby improving the desulfurization efficiency. And through the arrangement of the above structure, the output of seawater can be reduced as much as possible, which is more conducive to energy saving in actual production process.

[0044] In some embodiments, as shown in Figure 1 The multi-stage reaction assembly 3 includes a high-position spray structure 32, which includes a filler layer 321 and a third spray portion 322. The filler layer 321 is arranged on the inner wall of the tower body 1 above the second spray portion 312, and the third spray portion 322 is arranged on the inner wall of the tower body 1 above the filler portion.

[0045] The filler layer 321 is arranged above the second spray portion 312 and also corresponds to the flue gas passage. After two-stage desulfurization treatment, the temperature of the flue gas is further reduced, and compared with the temperature of the flue gas entering the tower body 1, the temperature of the flue gas after being treated by the second spray portion 312 will be reduced by about 30-40℃. At this time, when the flue gas moves to the position of the filler layer 321, its temperature has been reduced a lot. In actual application, the actual service life of the filler layer 321 can be increased by about 10-20%. And through the above way, the temperature of the flue gas entering the filler layer 321 is reduced, combined with the above multi-stage desulfurization effect, the flue gas volume is gradually reduced, which can effectively reduce the tower diameter of the tower body 1 (in actual application, the entire tower diameter can be reduced by about 5%) and reduce the risk of filler flooding.

[0046] The filler layer 321 is arranged to provide a relatively large contact surface for the flue gas and seawater when the flue gas moves to the position of the filler layer 321, thereby improving the reaction effect of the flue gas and seawater. The third spraying part 322 is the same as the two spraying parts described above, and also includes a plurality of spraying units with adjustable openings. In actual processing, the spraying amount can be adjusted in real time according to the flue gas concentration and flow, so as to form a dynamic spraying processing environment, which is more conducive to saving energy costs.

[0047] As described above, the flue gas can pass through three spraying reactions on the tower body 1 for desulfurization treatment. In combination with the actual production process, in order to further save costs, the actual spraying amount at the three spraying parts needs to be allocated, adjusted and controlled.

[0048] Specifically, the high-position spraying structure 32 is taken as the main reaction removal area. The middle-position spraying structure 31 and the first spraying part 22 are more like an adjustment and pretreatment function, which can make sufficient preparations for efficient desulfurization of the high-position spraying part. Therefore, in terms of the allocation of spraying amount, the spraying amount of the first spraying part 22 is about 10% of the total tower spraying amount, which can be adjusted within a certain range according to actual conditions. The spraying amount of the second spraying part 312 is about 20%-30% of the total tower spraying amount, which can be adjusted within a certain range according to actual conditions. The spraying amount of the third spraying part 322 is about 60%-70% of the total tower spraying amount, which can be adjusted within a certain range according to actual conditions.

[0049] Through the above allocation of spraying amount, the spraying reaction of seawater can be adjusted according to the characteristics of the actual reaction. Specifically, the full-tower pressure drop can be reduced by about 5%, and the power consumption can be saved by about 10%-20%.

[0050] In some embodiments, as shown in Figure 1 The liquid supply assembly 4 includes a seawater storage pool 45, a liquid inlet pipe assembly 41 and a pumping assembly 42. The seawater storage pool 45 is used to store seawater. The liquid inlet pipe assembly 41 includes a plurality of branch pipes 411 and a main pipe 412. The plurality of branch pipes 411 are connected to one end of the main pipe 412, and the other ends of the plurality of branch pipes 411 are respectively connected to the first spraying part 22 and the multi-stage reaction assembly 3. Flow adjusting units 4111 are arranged on the plurality of branch pipes 411. The pumping assembly 42 includes a pumping pipe 421 and a pump body 422. The pumping pipe 421 is arranged between the seawater storage pool 45 and the main pipe 412. The pump body 422 is installed on the pumping pipe 421.

[0051] Specifically, a siphon well 43 is provided at the inlet end of the water storage tank 45. During actual water supply, the pump body 422 starts working, sending seawater into the main pipeline 412 through the pumping pipe 421. The main pipeline 412 connects to multiple branch pipelines 411, which are specifically connected to the first spray section 22, the second spray section 312, and the third spray section 322, respectively. Therefore, when the main body is working, it can continuously pump the seawater in the water storage tank 45 to multiple spray structures. In order to facilitate the pre-control of the flow rate at multiple spray section locations to achieve the above-mentioned flow distribution, each of the multiple branch pipelines is provided with a flow regulating unit 4111. The flow regulating unit 4111 is preferably configured as an electrically controlled valve structure, thereby enabling terminal control. In order to ensure the pumping pressure, the pump body 422 is preferably configured as a booster pump.

[0052] Furthermore, to improve the stability of the conveying process and ensure the conveying pressure, it is preferable to provide at least two pumping components 42. If one of the pumping components 42 malfunctions, the other can still maintain the operation of the entire system.

[0053] In some embodiments, such as Figure 1 As shown, the liquid supply component 4 also includes a siphon well 43 and an aeration tank 44. The siphon well 43 is connected to the liquid inlet end of the water storage tank 45 to introduce seawater into the water storage tank 45. The water storage tank 45 and the lower end cavity of the tower body 1 are both connected to the aeration tank 44.

[0054] The waste liquid after the reaction inside the tower body 1 can be collected in the aeration tank 44. In the actual desulfurization process, the flue gas and seawater come into countercurrent contact inside the tower body 1. The SO2 in the flue gas is absorbed by the seawater to generate sulfite ions. Then, air is blown into the aeration tank 44 to oxidize the sulfite ions into stable sulfate ions, while restoring the pH value of the seawater.

[0055] This invention also proposes a method for seawater desulfurization, which is referred to in conjunction with the present invention. Figures 1 to 4 This seawater desulfurization method is based on a seawater desulfurization system 100. The specific structure of the seawater desulfurization system 100 is as described in the above embodiments. Therefore, the seawater desulfurization method has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here. The seawater desulfurization method includes the following steps: The flue gas is pretreated with seawater at the flue gas inlet 11 of the tower body 1; Specifically, the mapping control relationship between the opening degree of multiple spray units on the intake flue 21 and the flue gas temperature at both ends of the intake flue 21 and the amount of flue gas inside it is set. At the inlet flue 21, in order to ensure the cooling effect and the preliminary desulfurization effect of the flue gas, the flue gas parameters of the structure of the inlet flue 21 need to be monitored in real time, and the corresponding flue gas temperature parameters and flue gas concentration parameters also affect the actual opening of the plurality of spray units. For example, when the inlet temperature of the flue gas is relatively high and / or the concentration of the flue gas is relatively high, the actual opening of the plurality of spray units should also be adjusted to be larger at this time, so it is necessary to establish a corresponding mapping control relationship in advance to provide data reference for subsequent active adjustment intervention.

[0056] The liquid supply assembly 4 provides seawater to the plurality of spray units; The actual flue gas inlet amount of the inlet flue 21 and the actual temperature values of the flue gas at the two end positions of the inlet flue 21 are obtained to obtain actual flue gas inlet parameters; The temperature monitoring unit obtains the flue gas temperature changes at the two end positions of the inlet flue 21, the flue gas concentration monitoring device obtains the flue gas concentration values in the inlet flue 21, and the related values are associated, and the related information is transmitted to the terminal system through the set transmission mode.

[0057] The actual opening of the plurality of spray units is adjusted in real time through the actual flue gas inlet parameters and the mapping control relationship; The terminal system can compare the actual flue gas inlet parameters with the mapping control relationship to obtain the opening value of the spray unit under the current data, and adjust the actual opening of the spray unit in real time through the terminal system.

[0058] In some embodiments, the multi-stage desulfurization of the flue gas in the tower body 1 along the axial direction thereof includes the following steps: Specifically, the tower body 1 is divided into a second absorption zone and a third absorption zone corresponding to the second spray part 312 and the third spray part 322; As described above, in the present scheme, a plurality of desulfurization reaction zones are formed on the tower body 1, and the actual data of the flue gas in each reaction zone is different. For example, as the desulfurization reaction process proceeds, the temperature of the flue gas decreases, and the sulfur content also decreases, so it is necessary to divide the different action positions into a plurality of monitoring areas.

[0059] The sulfur content and the actual temperature of the flue gas in the second absorption zone and the third absorption zone are monitored in real time to form dynamic monitoring data; The first spray section 22, the second spray section 312, and the third spray section 322, as described above, implement a dynamically adjustable spraying method. This adjustment of spray parameters needs to be confirmed based on the actual flue gas parameters in different reaction zones. Generally, it is necessary to obtain the sulfur content and actual temperature of the flue gas at the inlet flue duct 21, the second absorption zone, and the third absorption zone in real time. This allows for real-time adjustment of the output parameters of the corresponding spray structures, thereby ensuring desulfurization efficiency while also contributing to energy conservation.

[0060] The sulfur content can be detected by infrared or ultraviolet light detection. The concentration of SO2 can be determined by analyzing its absorption spectrum at a specific wavelength.

[0061] The real-time spray volume of the second spray section 312 and the third spray section 322 is adjusted according to dynamic monitoring data. After multi-stage desulfurization treatment, the flue gas is initially dried in the tower body 1 before being discharged.

[0062] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A seawater desulfurization system, characterized in that, include: The tower body includes a smoke inlet and a smoke outlet, which are respectively provided at the upper and lower ends of the tower body to form a flue gas passage from bottom to top in its inner cavity. The flue gas treatment assembly includes an inlet flue and a first spray section. The inlet flue is located at the flue gas inlet and extends outward from the tower body. The first spray section is installed inside the inlet flue to cool and pre-remove the flue gas. A multi-stage reaction assembly, corresponding to the flue gas passage, is arranged sequentially within the inner cavity of the tower body to form a multi-stage desulfurization reaction within the tower body; and, A liquid supply assembly is connected to the first spray section and the multi-stage reaction assembly to supply seawater to the first spray section and the multi-stage reaction assembly.

2. The seawater desulfurization system as described in claim 1, characterized in that, The air intake duct includes an installation end and an air intake end, the installation end being connected to the smoke inlet, the first spray section being located at the midpoint between the installation end and the air intake end, and temperature monitoring devices being provided on both the air intake end and the installation end; and / or, The inner wall of the smoke outlet is also equipped with a defogging component.

3. The seawater desulfurization system as described in claim 2, characterized in that, The air intake duct is inclined, extending obliquely from the mounting end to the air intake end in the direction from the bottom to the top of the tower body; and / or, The first spray section includes multiple spray units, which are spaced apart on the inner wall of the air intake flue in the extending direction of the flue, and the opening degree of each spray unit is adjustable.

4. The seawater desulfurization system as described in claim 1, characterized in that, The multi-stage reaction assembly includes a central spray structure, which comprises: A rectifier section, installed on the inner wall of the tower body above the flue gas inlet, is used to rectify the flue gas; and, The second spray section is installed on the inner wall of the tower body above the rectifier section.

5. The seawater desulfurization system as described in claim 4, characterized in that, The multi-stage reaction assembly includes a high-level spray structure, which comprises: A packing layer, corresponding to the second spray section, is installed on the inner wall of the tower body; and, The third spray section is installed on the inner wall of the tower body above the packing section.

6. The seawater desulfurization system as described in claim 1, characterized in that, The liquid supply assembly includes: The forebay is used to store seawater; The liquid inlet pipe assembly includes multiple branch pipes and a main pipe. Each of the branch pipes is connected to one end of the main pipe, and the other ends of each branch pipe are respectively connected to the first spray section and the multi-stage reaction assembly. Each of the branch pipes is equipped with a flow regulation unit. A pumping assembly includes a pumping pipe and a pump body, wherein the pumping pipe is located between the water storage tank and the main pipeline, and the pump body is installed on the pumping pipe.

7. The seawater desulfurization system as described in claim 6, characterized in that, The liquid supply assembly further includes a siphon well and an aeration tank. The siphon well is connected to the inlet end of the pre-storage tank for introducing seawater into the pre-storage tank. The lower end cavity of both the pre-storage tank and the tower body is connected to the aeration tank; and / or, The pumping assembly is configured to consist of at least two units.

8. A seawater desulfurization method, based on the seawater desulfurization system as described in any one of claims 1-7, characterized in that, The seawater desulfurization method includes the following steps: The flue gas is pretreated with seawater at the flue gas inlet of the tower body; The flue gas undergoes multi-stage desulfurization along its axial direction within the tower body; The gases and waste liquids generated during desulfurization are treated before being discharged.

9. The seawater desulfurization method as described in claim 1, characterized in that, The pretreatment of flue gas with seawater at the flue gas inlet of the tower body includes: Set the mapping control relationship between the opening degree of multiple spray units on the intake flue and the flue gas temperature at both ends of the intake flue and the flue gas volume inside it. Seawater is supplied to multiple spray units via a liquid supply assembly; The actual smoke intake volume and the actual temperature of the flue gas at both ends of the intake flue are obtained to obtain the actual smoke intake parameters. The actual opening degree of multiple spray units is adjusted in real time by using actual smoke inlet parameters and mapping control relationships.

10. The seawater desulfurization method as described in claim 8, characterized in that, The multi-stage desulfurization of flue gas within the tower body along its axial direction includes: The tower body is divided into a second absorption zone and a third absorption zone corresponding to the second and third spray sections. The sulfur content and actual temperature of the flue gas in the second and third absorption zones are monitored in real time to generate dynamic monitoring data. The real-time spray volume of the second and third spray sections is adjusted based on dynamic monitoring data.

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