High-sulfur flue gas wet desulphurization system

Abstract

The invention belongs to the technical field of high-sulfur flue gas desulfurization, and relates to a high-sulfur flue gas wet desulfurization system which comprises an inlet flue (1), an absorption tower (2), a primary demister (3), a condensation inlet flue (4), a condensation tower (5) and a secondary demister (6), the absorption tower (2) is respectively connected with the inlet flue (1) and the primary demister (3), the condensation tower (5) is connected with the condensation inlet flue (4), and the secondary demister (6) is connected with the condensation tower (5). The condensation inlet flue (4) is respectively connected with the primary demister (3) and the condensing tower (5), and the secondary demister (6) is connected with the condensing tower (5). According to the high-sulfur flue gas wet desulphurization system provided by the invention, aiming at high-sulfur flue gas with relatively special components, measures such as system design, absorption tower structure optimization, efficiency raising device addition and multi-stage dehumidification and demisting are comprehensively considered, so that the SO3 trapping capability of slurry is improved, and stable operation of the system is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of high-sulfur flue gas desulfurization, and in particular to a high-sulfur flue gas wet desulfurization system. Background Art

[0002] The limestone / gypsum wet flue gas desulfurization process has been developed and mature in the treatment of high-sulfur flue gas, but some flue gases in the industry are affected by the main process and have complex components. For example, vanadium in vanadium-titanium ore can catalytically oxidize flue gas SO2 to SO3), resulting in a high content of SO3 in the flue gas, and almost all of the SO3 in the flue gas exists in the form of submicron acid mist. Conventional wet desulfurization processes have limited effect on the removal of SO3, which can easily cause blockage and corrosion of the subsequent denitrification system. Secondly, the flue gas temperature after wet desulfurization is low and the water content is high, which makes the subsequent denitrification system insufficiently heated and the catalyst blocked and deactivated. Summary of the invention

[0003] In view of this, the present invention provides a high-sulfur flue gas wet desulfurization system.

[0004] Specifically, the present invention is achieved through the following technical solutions:

[0005] According to a first aspect of the present invention, there is provided a high-sulfur flue gas wet desulfurization system, comprising: an inlet flue, an absorption tower, a primary demister, a condensation inlet flue, a condensation tower and a secondary demister, wherein the absorption tower is connected to the inlet flue and the primary demister, respectively, the condensation inlet flue is connected to the primary demister and the condensation tower, respectively, and the secondary demister is connected to the condensation tower.

[0006] Optionally, the absorption tower includes: a first tower body, a primary spray layer, a liquid collecting bowl, a high-efficiency turbulator, a secondary spray layer, a primary desulfurization slurry pool and a primary desulfurization slurry pool agitator, wherein the primary spray layer, the liquid collecting bowl, the high-efficiency turbulator and the secondary spray layer are arranged in the first tower body from bottom to top, the inlet flue is connected to the first tower body, and the connection between the two is lower than the primary spray layer, the primary desulfurization slurry pool is arranged in the first tower body and lower than the inlet flue, the primary desulfurization slurry pool agitator is arranged in the primary desulfurization slurry pool, and the primary demister is arranged at the top of the first tower body.

[0007] Optionally, the condensation tower includes: a second tower body, a liquid collecting tank, a filler, a condensation spray layer, a secondary desulfurization slurry pool and a secondary desulfurization slurry pool agitator, wherein the liquid collecting tank, the filler and the condensation spray layer are arranged in the second tower body from bottom to top, the condensation inlet flue is connected to the second tower body, and the connection between the two is lower than the liquid collecting tank, the secondary desulfurization slurry pool is arranged in the second tower body, and is lower than the connection between the condensation inlet flue and the second tower body, the secondary desulfurization slurry pool agitator is arranged in the secondary desulfurization slurry pool, and the secondary demister is arranged at the top of the second tower body.

[0008] Optionally, it also includes: a wet electrostatic precipitator, which is connected to the secondary demister.

[0009] Optionally, it also includes: an outlet flue, wherein the outlet flue is connected to the wet electrostatic precipitator.

[0010] Optionally, it also includes: a three-stage demister, wherein the three-stage demister is arranged in the outlet flue.

[0011] Optionally, it also includes: a slurry circulation device, which is connected to the absorption tower and the condensation tower respectively.

[0012] Optionally, the slurry circulation device includes: a primary circulation pipeline, a primary circulation pump, a secondary circulation pipeline, a secondary circulation pump, a secondary slurry return pipeline, a secondary slurry cyclone pipeline, a secondary slurry cyclone pump, an oxidation air pipeline and an oxidation fan, wherein the primary circulation pipeline is respectively connected to the primary spray layer and the primary desulfurization slurry pool in the absorption tower, the primary circulation pump is arranged on the primary circulation pipeline, the secondary circulation pipeline is respectively connected to the secondary spray layer in the absorption tower and the secondary desulfurization slurry pool in the condensation tower, the secondary circulation pump is arranged on the secondary circulation pipeline, the secondary slurry return pipeline is respectively connected to the liquid collecting bowl in the absorption tower and the secondary desulfurization slurry pool, the secondary slurry cyclone pipeline is respectively connected to the primary desulfurization slurry pool and the secondary desulfurization slurry pool, the secondary slurry cyclone pump is arranged on the secondary slurry cyclone pipeline, the oxidation air pipeline is respectively connected to the primary desulfurization slurry pool and the secondary desulfurization slurry pool, and the oxidation fan is arranged on the oxidation air pipeline.

[0013] Optionally, it further includes: a condensing device, wherein the condensing device is connected to the condensing tower.

[0014] Optionally, the condensing device includes: a heat exchanger, a condensation spray inlet pipe, a condensation spray outlet pipe, a cooling tower, a circulating cooling water inlet pipe, a circulating cooling water outlet pipe, a spray condensation pump and a circulating cooling water pump, wherein the condensation spray inlet pipe is respectively connected to the condensation spray layer in the condensation tower and the heat exchanger, the condensation spray outlet pipe is respectively connected to the liquid collecting tank in the condensation tower and the heat exchanger, the spray condensation pump is arranged on the condensation spray outlet pipe, the circulating cooling water inlet pipe is respectively connected to the heat exchanger and the cooling tower, the circulating cooling water outlet pipe is respectively connected to the heat exchanger and the cooling tower, and the circulating cooling water pump is arranged on the circulating cooling water outlet pipe.

[0015] The technical solution provided by the present invention brings at least the following beneficial effects:

[0016] The high-sulfur flue gas wet desulfurization system provided in this application is designed for high-sulfur flue gas with special components. It comprehensively considers system design, optimizes the absorption tower structure, adds efficiency-enhancing devices, multi-stage dehumidification and demisting measures, and improves the slurry's SO 3 Capture capacity to ensure stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 A schematic structural diagram of a high-sulfur flue gas wet desulfurization system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Figure 1 A high-sulfur flue gas wet desulfurization system applicable to an embodiment of the present invention is schematically shown.

[0022] Reference Figure 1 As shown, the present application provides a high-sulfur flue gas wet desulfurization system including: an inlet flue 1, an absorption tower 2, a primary demister 3, a condensation inlet flue 4, a condensation tower 5 and a secondary demister 6, wherein the absorption tower 2 is connected to the inlet flue 1 and the primary demister 3 respectively, the condensation inlet flue 4 is connected to the primary demister 3 and the condensation tower 5 respectively, and the secondary demister 6 is connected to the condensation tower 5.

[0023] In the embodiment of the present application, the inlet flue 1 is connected to the absorption tower 2, and the connection position of the two is located in the lower middle part of the absorption tower 2. The absorption tower 2 is used to receive the flue gas input from the inlet flue 1 and complete the primary desulfurization reaction of the flue gas. The condensation tower 5 is connected to the absorption tower 2 through the condensation inlet flue 4.

[0024] Exemplarily, the absorption tower 2 includes: a first tower body 20, a primary spray layer 21, a liquid collecting bowl 22, a high-efficiency turbulator 23, a secondary spray layer 24, a primary desulfurization slurry pool 25 and a primary desulfurization slurry pool agitator 26, wherein the primary spray layer 21, the liquid collecting bowl 22, the high-efficiency turbulator 23 and the secondary spray layer 24 are arranged in the first tower body 20 from bottom to top, the inlet flue 1 is connected to the first tower body 20, and the connection between the two is lower than the primary spray layer 21, the primary desulfurization slurry pool 25 is arranged in the first tower body 20, and is lower than the inlet flue 1, the primary desulfurization slurry pool agitator 26 is arranged in the primary desulfurization slurry pool 25, and the primary demister 3 is arranged at the top of the first tower body 20.

[0025] In the embodiment of the present application, the inlet flue 1 is connected to the absorption tower 2, and the connection position of the two is located in the lower middle part of the absorption tower 2 and above the primary desulfurization slurry pool 25. The absorption tower 2 is provided with a primary spray layer 21, a liquid collecting bowl 22, a high-efficiency turbulator 23, a secondary spray layer 24 and a primary demister 3 from bottom to top. The absorption tower 2 is used to receive the flue gas input from the inlet flue 1 and complete the primary desulfurization reaction of the flue gas. A primary desulfurization slurry pool 25 is provided at the bottom of the absorption tower 2, and the primary desulfurization slurry pool 25 can store desulfurized slurry. A primary desulfurization slurry pool agitator 26 is provided in the primary desulfurization slurry pool 25, which can stir and mix the slurry to prevent sludge deposition in the tower and prevent dust and crystals in the slurry from settling and agglomerating.

[0026] Exemplarily, the condensation tower 5 includes: a second tower body 50, a liquid collecting tank 51, a filler 52, a condensation spray layer 53, a secondary desulfurization slurry pool 54 and a secondary desulfurization slurry pool agitator 55, wherein the liquid collecting tank 51, the filler 52 and the condensation spray layer 53 are arranged in the second tower body 50 from bottom to top, the condensation inlet flue 4 is connected to the second tower body 50, and the connection between the two is lower than the liquid collecting tank 51, the secondary desulfurization slurry pool 54 is arranged in the second tower body 50, and is lower than the connection between the condensation inlet flue 4 and the second tower body 50, the secondary desulfurization slurry pool agitator 55 is arranged in the secondary desulfurization slurry pool 54, and the secondary demister 6 is arranged at the top of the second tower body 50.

[0027] In the embodiment of the present application, the condensation tower 5 is connected to the absorption tower 2 through the condensation inlet flue 4. The condensation tower 5 is provided with a liquid collecting tank 51, a filler 52, a condensation spray layer 53 and a secondary demister 6 from top to bottom. A secondary desulfurization slurry pool 54 is provided at the bottom of the condensation tower 5, and the secondary desulfurization slurry pool 54 can store desulfurized slurry. A secondary desulfurization slurry pool agitator 55 is provided in the secondary desulfurization slurry pool 54, which can stir and mix the slurry to prevent sludge deposition in the tower and prevent dust and crystals in the slurry from settling and agglomerating.

[0028] Exemplarily, a high-sulfur flue gas wet desulfurization system provided in the present application further includes: a wet electrostatic precipitator 7 , and the wet electrostatic precipitator 7 is connected to the secondary demister 6 .

[0029] In the embodiment of the present application, the wet electrostatic precipitator 7 can complete the deep dust removal of the flue gas. The wet electrostatic precipitator 7 is arranged above the secondary demister 6, which can achieve deep dust removal of the flue gas. The wet electrostatic precipitator 7 is connected to the desulfurization outlet flue 8, and the outlet flue 8 is provided with a three-stage demister 9. After the dust removal, the flue gas first passes through the three-stage demister 9 for three-stage demistering, and then continues to enter the subsequent equipment through the outlet flue 8.

[0030] Exemplarily, a high-sulfur flue gas wet desulfurization system provided in the present application further includes: an outlet flue 8 , wherein the outlet flue 8 is connected to the wet electrostatic precipitator 7 .

[0031] In the embodiment of the present application, the outlet flue 8 is used to discharge smoke.

[0032] Exemplarily, a high-sulfur flue gas wet desulfurization system provided in the present application further includes: a three-stage demister 9 , wherein the three-stage demister 9 is disposed in the outlet flue 8 .

[0033] In the embodiment of the present application, a three-stage demister 9 is used for demisting.

[0034] Illustratively, a high-sulfur flue gas wet desulfurization system provided in the present application further includes: a slurry circulation device 10, and the slurry circulation device 10 is connected to the absorption tower 2 and the condensation tower 5 respectively.

[0035] In the embodiment of the present application, the slurry circulation device 10 includes: a primary circulation pipeline 11, a primary circulation pump 12, a secondary circulation pipeline 13, a secondary circulation pump 14, a secondary slurry return pipeline 15, a secondary slurry cyclone pipeline 16, a secondary slurry cyclone pump 17, an oxidation air pipeline 18 and an oxidation fan 19, wherein the primary circulation pipeline 11 is respectively connected to the primary spray layer 21 and the primary desulfurization slurry pool 25 in the absorption tower 2, the primary circulation pump 12 is arranged on the primary circulation pipeline 11, and the secondary circulation pipeline 13 is respectively connected to the secondary spray layer 24 and the cooling slurry pool 25 in the absorption tower 2. The secondary desulfurization slurry pool 54 in the coagulation tower 5, the secondary circulation pump 14 is arranged on the secondary circulation pipeline 13, the secondary slurry reflux pipeline 15 is respectively connected to the liquid collecting bowl 22 in the absorption tower 2 and the secondary desulfurization slurry pool 54, the secondary slurry cyclone pipeline 16 is respectively connected to the primary desulfurization slurry pool 25 and the secondary desulfurization slurry pool 54, the secondary slurry cyclone pump 17 is arranged on the secondary slurry cyclone pipeline 16, the oxidation air pipeline 18 is respectively connected to the primary desulfurization slurry pool 25 and the secondary desulfurization slurry pool 54, and the oxidation fan 19 is arranged on the oxidation air pipeline 18.

[0036] In the embodiment of the present application, three slurry circulation pipelines, namely, a primary circulation pipeline 11, a secondary circulation pipeline 13 and a secondary slurry return pipeline 15, are provided in the slurry circulation device 10. The primary circulation pipeline 11 connects the primary desulfurization slurry pool 25 with the primary spray layer 21. The primary circulation pipeline 11 is also provided with a primary circulation pump 12, which can transport the desulfurized slurry from the primary desulfurization slurry pool 25 to the primary spray layer 21 to achieve primary desulfurization of flue gas. The secondary desulfurization slurry pool 54, the secondary circulation pipeline 13, the secondary spray layer 24, the liquid collecting bowl 22 and the secondary slurry return pipeline 15 form a secondary slurry circulation assembly. The secondary circulation pipeline 13 is provided with a secondary circulation pump 14, which can transport the desulfurized slurry from the secondary desulfurization slurry pool 54 to the secondary spray layer 24 to achieve secondary desulfurization of flue gas. A plurality of oxidation fans 19 are provided on the oxidation air duct 18 , and the flow rates of the oxidation fans 19 are different. The oxidation fans 19 with large flow rates provide oxidation air to the absorption tower 2 , and the oxidation fans 19 with small flow rates provide oxidation air to the condensation tower 5 .

[0037] Illustratively, a high-sulfur flue gas wet desulfurization system provided in the present application further includes: a condensing device 110 , wherein the condensing device 110 is connected to the condensing tower 5 .

[0038] In the embodiment of the present application, the condensing device 110 is used for condensation.

[0039] Exemplarily, the condensing device 110 includes: a heat exchanger 111, a condensation spray inlet pipe 112, a condensation spray outlet pipe 113, a cooling tower 114, a circulating cooling water inlet pipe 115, a circulating cooling water outlet pipe 116, a spray condensation pump 117 and a circulating cooling water pump 118, wherein the condensation spray inlet pipe 112 is respectively connected to the condensation spray layer 53 in the condensation tower 5 and the heat exchanger 111, the condensation spray outlet pipe 113 is respectively connected to the sump 51 in the condensation tower 5 and the heat exchanger 111, the spray condensation pump 117 is arranged on the condensation spray outlet pipe 113, the circulating cooling water inlet pipe 115 is respectively connected to the heat exchanger 111 and the cooling tower 114, the circulating cooling water outlet pipe 116 is respectively connected to the heat exchanger 111 and the cooling tower 114, and the circulating cooling water pump 118 is arranged on the circulating cooling water outlet pipe 116.

[0040] In the embodiment of the present application, the heat exchanger 111 in the condensing device 110 is connected to the condensation spray layer 53 through the condensation spray inlet pipe 112, and the heat exchanger 111 is connected to the sump 51 through the condensation spray outlet pipe 113. The condensation spray outlet pipe 113 is provided with a spray condensation pump 117. The circulating cooling water inlet pipe 115 connects the outlet of the cooling tower 114 and the circulating cooling water inlet of the heat exchanger 111, and the circulating cooling water outlet pipe 116 connects the inlet of the cooling tower 114 and the circulating cooling water outlet of the heat exchanger 111. The circulating cooling water outlet pipe 116 is provided with a circulating cooling water pump 118.

[0041] The operating steps of a high-sulfur flue gas wet desulfurization system provided in this application are as follows:

[0042] Step 1: After the system is in operation, the raw flue gas to be desulfurized enters the absorption tower 2 from the inlet flue 1 and then moves upward. At this time, the desulfurization slurry in the primary desulfurization slurry pool 25 is transported to the primary spray layer 21. The primary spray layer 21 is opened, and the downward desulfurization slurry contacts the upward raw flue gas to cause a primary desulfurization reaction.

[0043] Step 2: The flue gas that has completed the primary desulfurization reaction continues to ascend, and the desulfurization slurry in the secondary desulfurization slurry pool 54 is transported to the secondary spray layer 24. The secondary spray layer 24 is turned on, and the original flue gas and the desulfurization slurry undergo a secondary desulfurization reaction. A high-efficiency turbulent flow device 23 is set in the secondary desulfurization reaction area to improve the mass transfer power of the desulfurization reaction. While ensuring the SO2 removal efficiency, the SO3 removal efficiency can be increased by 20%.

[0044] Step 3: The flue gas that has completed the secondary desulfurization reaction continues to move upward and enters the primary demister 3. After passing through the primary demister 3, the droplets entrained in the flue gas are separated, completing the primary dehumidification and reducing the droplet content entering the subsequent equipment.

[0045] Step 4: Flue gas condensation adopts direct spray condensation mode. Flue gas enters condensation tower 5 from condensation inlet flue 4 and the temperature of desulfurized flue gas is reduced after passing through condensation spray layer 53.

[0046] Step 5: The flue gas goes upward and enters the secondary demister 6 to further remove the droplets in the flue gas, and can also simultaneously remove a small amount of large particles in the flue gas.

[0047] Step 6: The flue gas that has completed condensation and dehumidification enters the wet electrostatic precipitator 7, which reduces the concentration of particulate matter in the flue gas to the standard emission concentration and has a good removal effect on SO3 in the flue gas. The flue gas that has completed dust removal enters the three-stage demister 9 to complete the three-stage dehumidification.

[0048] Step 7: The flue gas meets the emission standards after double-stage desulfurization, condensation dehumidification and deep dust removal, and then enters the subsequent equipment through the outlet flue 8.

[0049] The present application is a single-tower double-circulation desulfurization, and the flue gas is washed by slurries of different properties to remove SO2 and SO3 in the flue gas. According to the pH value required for the two-stage desulfurization reaction, two slurry pools, a primary desulfurization slurry pool 25 and a secondary desulfurization slurry pool 54, are set. The primary desulfurization reaction focuses on coarse desulfurization and oxidation crystallization, which is a low pH value working condition. The secondary desulfurization reaction focuses on fine desulfurization. The high pH value setting is conducive to the absorption of SO2 and SO3 in the flue gas. The high-efficiency turbulator 23 can improve the mass transfer power of the desulfurization reaction of the absorption tower 2, and can synergistically improve the removal efficiency of SO3 by 20%, which is particularly suitable for the treatment of high SO3 flue gas in the vanadium-titanium magnetite smelting process. The primary spray layer 22 and the secondary spray layer 24 are designed with multiple spray layers. The number of spray layers and the spray form can be specifically arranged according to the flue gas desulfurization situation. The spray layer corresponds to the nozzle flow equal to ensure that the slurry is fully in contact and reacts with the flue gas. The spray layer spacing design ensures that it fully covers the ascending flue gas. The condensation spray layer 53 is designed in multiple layers, and the number of layers is usually two-layer spraying mode, which can also be flexibly adjusted according to the amount of flue gas to be condensed, and the condensed water is independently circulated. The condensation tower 5 can be provided with a filler 52 to increase the heat exchange efficiency between the condensed water and the flue gas.

[0050] In the embodiment of the present application, the condensation dehumidification and dust removal technology adopts a three-stage demister for dehumidification, which are a first-stage demister 3 arranged at the outlet of the absorption tower 2, a second-stage demister 6 on the top of the condensation tower 5 and a third-stage demister 11 on the outlet flue 8. The demister can be designed as a composite demister of a first-stage tube type plus a two-stage ridge type, or it can be designed as a single-type demister according to the requirements of flue gas dehumidification. At the same time, a wet electrostatic precipitator 7 is arranged above the second-stage demister 6 to remove particulate matter while synergistically removing SO3, heavy metals, etc., to avoid blockage and corrosion of downstream equipment and flues, and improve the operating stability of the subsequent denitrification system.

[0051] In the embodiment of the present application, after the system is in operation, the primary circulation pump 12 transports the desulfurized slurry to the primary spray layer 21 through the primary circulation pipeline 11. After the primary spray layer 21 is opened, the downward desulfurized slurry is fully mixed with the upward flue gas to generate a primary desulfurization reaction, and the generated desulfurization byproducts return to the primary desulfurization slurry pool 25 at the bottom of the absorption tower 2 under the action of gravity, forming a primary slurry circulation. The slurry circulation device 10 also includes a secondary slurry circulation component, and the secondary circulation pump 14 transports the desulfurized slurry to the secondary spray layer 24 through the secondary circulation pipeline 13. The desulfurization byproducts generated by the secondary desulfurization reaction are collected in the liquid collecting bowl 22, and then returned to the secondary desulfurization slurry pool 54 through the secondary slurry reflux pipeline 15.

[0052] In the embodiment of the present application, the slurry circulation device 10 is further provided with an oxidation fan 19, which is connected to the primary desulfurization slurry pool 25 and the secondary desulfurization slurry pool 54 respectively through the oxidation air pipeline 18, and provides oxidation air for the two desulfurization slurry pools. The oxidation fan 19 is designed as two-for-one standby, with a flow rate of two large and one small. The large-flow oxidation fan 19 provides oxidation air to the primary desulfurization slurry pool 25, and the small-flow oxidation fan 19 provides oxidation air to the secondary desulfurization slurry pool 54. The parameter design of the oxidation fan 19 can be adjusted according to actual conditions.

[0053] In the embodiment of the present application, in order to avoid sludge deposition in the tower and ensure the slurry mixing and output functions, the primary desulfurization slurry pool 25 and the secondary desulfurization slurry pool 54 are respectively provided with a primary desulfurization slurry pool agitator 26 and a secondary desulfurization slurry pool agitator 55, which can alleviate the precipitation and agglomeration of dust and crystals in the slurry. The arrangement of the agitator should be considered comprehensively with the arrangement of the slurry pool oxidation wind.

[0054] In the embodiment of the present application, the slurry circulation device 10 also includes a secondary slurry cyclone pump 17, which is arranged in the secondary slurry cyclone pipeline 16. Since the pH of the secondary desulfurization slurry pool 54 is relatively high and its oxidation effect is not good, part of the slurry can be transported to the primary desulfurization slurry pool 25 for treatment and then discharged. In actual operation, excessive transportation of desulfurized slurry to the primary desulfurization slurry pool 25 may cause the pH of the primary desulfurization slurry pool 25 to fluctuate. The secondary slurry cyclone pump 17 can be adjusted to ensure that the pH value is within the normal range.

[0055] In the embodiment of the present application, after the system is in operation, the cooling tower 114 provides circulating cooling water to the heat exchanger 111 through the circulating cooling water inlet pipe 115. After the circulating cooling water in the heat exchanger 111 exchanges heat with the condensed water, the condensed water enters the condensation spray layer 53 through the condensation spray inlet pipe 112. The condensed water condenses and cools the flue gas in the condensation tower 5, and then the condensed water is collected in the sump 51. Most of the recovered condensed water is returned to the heat exchanger 111 by the spray condensation pump 117 through the condensation spray outlet pipe 113, and heat is exchanged with the circulating cooling water again to complete the next condensation spray cycle; the remaining condensed water can be used for other equipment. After the circulating cooling water completes the heat exchange in the heat exchanger 111, it is returned to the cooling tower 114 by the circulating cooling water pump 118 through the circulating cooling water outlet pipe 116, completing a cycle. After the circulating cooling water returns to the cooling tower 114, it is cooled to the required temperature again and can be used again in the heat exchanger 111.

[0056] The high-sulfur flue gas wet desulfurization system provided in this application is designed for high-sulfur flue gas with special components. It comprehensively considers system design, optimizes the absorption tower structure, adds efficiency-enhancing devices, multi-stage dehumidification and demisting measures, and improves the slurry's SO 3 Capture capacity to ensure stable operation of the system.

[0057] It should be noted that, in the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0058] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0059] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0060] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0061] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A high-sulfur flue gas wet desulfurization system, characterized in that: include: An inlet flue (1), an absorption tower (2), a primary demister (3), a condensation inlet flue (4), a condensation tower (5) and a secondary demister (6), wherein the absorption tower (2) is connected to the inlet flue (1) and the primary demister (3), respectively, the condensation inlet flue (4) is connected to the primary demister (3) and the condensation tower (5), respectively, and the secondary demister (6) is connected to the condensation tower (5).

2. The high-sulfur flue gas wet desulfurization system according to claim 1 is characterized in that: The absorption tower (2) comprises: a first tower body (20), a primary spray layer (21), a liquid collecting bowl (22), a high-efficiency turbulator (23), a secondary spray layer (24), a primary desulfurization slurry pool (25) and a primary desulfurization slurry pool agitator (26), wherein the primary spray layer (21), the liquid collecting bowl (22), the high-efficiency turbulator (23) and the secondary spray layer (24) are sequentially arranged in the first tower body (20) from bottom to top, the inlet flue (1) is connected to the first tower body (20), and the connection between the two is lower than the primary spray layer (21), the primary desulfurization slurry pool (25) is arranged in the first tower body (20) and lower than the inlet flue (1), the primary desulfurization slurry pool agitator (26) is arranged in the primary desulfurization slurry pool (25), and the primary demister (3) is arranged at the top of the first tower body (20).

3. The high-sulfur flue gas wet desulfurization system according to claim 1, characterized in that: The condensation tower (5) comprises: a second tower body (50), a liquid collecting tank (51), a filler (52), a condensation spray layer (53), a secondary desulfurization slurry pool (54) and a secondary desulfurization slurry pool agitator (55), wherein the liquid collecting tank (51), the filler (52) and the condensation spray layer (53) are arranged in sequence from bottom to top in the second tower body (50), the condensation inlet flue (4) is connected to the second tower body (50), and the connection between the two is lower than the liquid collecting tank (51), the secondary desulfurization slurry pool (54) is arranged in the second tower body (50), and is lower than the connection between the condensation inlet flue (4) and the second tower body (50), the secondary desulfurization slurry pool agitator (55) is arranged in the secondary desulfurization slurry pool (54), and the secondary demister (6) is arranged at the top of the second tower body (50).

4. The high-sulfur flue gas wet desulfurization system according to claim 1, characterized in that: Also includes: A wet electrostatic precipitator (7), wherein the wet electrostatic precipitator (7) is connected to the secondary demister (6).

5. The high-sulfur flue gas wet desulfurization system according to claim 4, characterized in that: Also includes: An outlet flue (8), wherein the outlet flue (8) is connected to the wet electrostatic precipitator (7).

6. The high-sulfur flue gas wet desulfurization system according to claim 5, characterized in that: Also includes: A three-stage demister (9), wherein the three-stage demister (9) is arranged in the outlet flue (8).

7. The high-sulfur flue gas wet desulfurization system according to claim 1, characterized in that: Also includes: A slurry circulation device (10), wherein the slurry circulation device (10) is connected to the absorption tower (2) and the condensation tower (5) respectively.

8. The high-sulfur flue gas wet desulfurization system according to claim 7, characterized in that: The slurry circulation device (10) comprises: a primary circulation pipeline (11), a primary circulation pump (12), a secondary circulation pipeline (13), a secondary circulation pump (14), a secondary slurry return pipeline (15), a secondary slurry cyclone pipeline (16), a secondary slurry cyclone pump (17), an oxidation air pipeline (18) and an oxidation fan (19), wherein the primary circulation pipeline (11) is respectively connected to a primary spray layer (21) and a primary desulfurization slurry pool (25) in the absorption tower (2), the primary circulation pump (12) is arranged on the primary circulation pipeline (11), and the secondary circulation pipeline (13) is respectively connected to a secondary spray layer (24) and a condensation tower (25) in the absorption tower (2). 5), the secondary desulfurization slurry pool (54) in the absorption tower (2), the secondary circulation pump (14) is arranged on the secondary circulation pipeline (13), the secondary slurry return pipeline (15) is respectively connected to the liquid collecting bowl (22) in the absorption tower (2) and the secondary desulfurization slurry pool (54), the secondary slurry cyclone pipeline (16) is respectively connected to the primary desulfurization slurry pool (25) and the secondary desulfurization slurry pool (54), the secondary slurry cyclone pump (17) is arranged on the secondary slurry cyclone pipeline (16), the oxidation air pipeline (18) is respectively connected to the primary desulfurization slurry pool (25) and the secondary desulfurization slurry pool (54), and the oxidation fan (19) is arranged on the oxidation air pipeline (18).

9. The high-sulfur flue gas wet desulfurization system according to claim 1, characterized in that: It also comprises: a condensing device (11), wherein the condensing device (11) is connected to the condensing tower (5).

10. The high-sulfur flue gas wet desulfurization system according to claim 9, characterized in that: The condensation device (11) comprises: a heat exchanger (111), a condensation spray inlet pipe (112), a condensation spray outlet pipe (113), a cooling tower (114), a circulating cooling water inlet pipe (115), a circulating cooling water outlet pipe (116), a spray condensation pump (117) and a circulating cooling water pump (118), wherein the condensation spray inlet pipe (112) is respectively connected to the condensation spray layer (53) in the condensation tower (5) and the heat exchanger (111), and the condensation spray outlet pipe (113) is respectively connected to the condensation spray layer (53) in the condensation tower (5). The cooling tower (114) and the cooling tower (115) are connected to the liquid collecting tank (51) and the heat exchanger (111) in the condensation tower (5), respectively; the spray condensation pump (117) is arranged on the condensation spray outlet pipe (113); the circulating cooling water inlet pipe (115) is connected to the heat exchanger (111) and the cooling tower (114), respectively; the circulating cooling water outlet pipe (116) is connected to the heat exchanger (111) and the cooling tower (114), respectively; and the circulating cooling water pump (118) is arranged on the circulating cooling water outlet pipe (116).

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