Wet flue gas desulfurization system
By using a wet flue gas desulfurization system to perform multi-stage purification treatment on the wastewater from the catalytic cracking production unit, the problems of wastewater pollution and low resource utilization rate have been solved, and the reuse of wastewater and the conservation of water resources have been realized.
Patent Information
- Application Number
- CN202423176020.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Wastewater generated by catalytic cracking production units causes serious water pollution and low water resource utilization.
A wet flue gas desulfurization system is adopted, including a stripping tower, regulating valve, deodorization mechanism, water washing tank, valves and desulfurization tower. Through multi-stage purification treatment, wastewater can be reused, reducing the amount of fresh water used.
It reduced wastewater discharge, improved water resource utilization, reduced water pollution, and saved on the use of fresh water.
Smart Images
Figure CN223570405U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of chemical production, in particular to a wet flue gas desulfurization system. BACKGROUND
[0002] In the catalytic cracking production ethylene propylene device, the raw oil is atomized into the reactor through the feed nozzle and contacted with the high-temperature catalyst to be immediately vaporized and rapidly reacted, and the catalyst completes the reaction and enters the regenerator, a large amount of flue gas containing sulfur dioxide is generated in the regenerator, and the flue gas containing sulfur dioxide finally enters the desulfurization tower for desulfurization.
[0003] A large amount of wastewater is generated in the production process of the catalytic cracking production device, and at present, the wastewater is directly sent to the wastewater treatment plant, which not only causes high pollution to the water environment, but also has low utilization rate of water resources. CONTENT OF THE UTILITY MODEL
[0004] The present application provides a wet flue gas desulfurization system, which solves the problem of high water environment pollution and low water resource utilization rate caused by a large amount of wastewater generated in the production process of the existing catalytic cracking production device.
[0005] The utility model discloses a wet flue gas desulfurization system, which comprises a stripping tower, a regulating valve, a deodorization mechanism, a water washing tank, a first valve, a second valve, a third valve and a desulfurization tower, the stripping tower is used for primary treatment of wastewater to obtain primary purified water, the regulating valve is installed on the connecting pipeline between the stripping tower and the wastewater treatment plant, the water inlet of the deodorization mechanism is communicated with the water outlet of the stripping tower, and the deodorization mechanism is used for deodorizing the primary purified water to obtain secondary purified water, the first valve is arranged on the connecting pipeline between the stripping tower and the deodorization mechanism, the water washing tank is communicated with a fresh water conveying pipe, the second valve and the third valve are installed on the fresh water conveying pipe, the water outlet of the deodorization mechanism is communicated with the fresh water conveying pipe and located between the second valve and the third valve, and the water inlet of the desulfurization tower is communicated with the water outlet of the water washing tank.
[0006] In a possible implementation manner, the deodorization mechanism comprises a supporting cylinder and an adsorbent, the water inlet of the supporting cylinder is communicated with the water outlet of the stripping tower, and the water outlet of the supporting cylinder is communicated with the fresh water conveying pipe, and the adsorbent is filled in the inner cavity of the supporting cylinder.
[0007] In a possible implementation manner, the deodorization mechanism further comprises a wire mesh, the wire mesh is connected with the inner wall of the supporting cylinder, and the wire mesh is located at the lower part of the supporting cylinder, the adsorbent is located above the wire mesh, and the pore size of the wire mesh is smaller than the diameter of the adsorbent.
[0008] In a possible implementation, the deodorizing mechanism further comprises a vent valve and a first pipeline; the first pipeline is arranged at the bottom of the supporting cylinder and communicates with the inner cavity of the supporting cylinder; and the vent valve is installed on the first pipeline.
[0009] In a possible implementation, the deodorizing mechanism further comprises an emptying valve and a second pipeline; the second pipeline is arranged at the top of the supporting cylinder and communicates with the inner cavity of the supporting cylinder; and the emptying valve is installed on the second pipeline.
[0010] In a possible implementation, the desulfurization tower comprises a cylinder body, a mist eliminator and a plurality of spraying mechanisms; the cylinder body communicates with the flue gas inlet pipe; the plurality of spraying mechanisms are arranged in the inner cavity of the cylinder body along the height direction of the cylinder body; each spraying mechanism communicates with the water washing tank and is used for spraying alkaline solution; and the mist eliminator is installed in the cylinder body and located above the plurality of spraying mechanisms and is used for removing mist droplets in flue gas.
[0011] In a possible implementation, the spraying mechanism comprises a water supply pipe and a plurality of nozzles; the water supply pipe communicates with the water washing tank; and the water inlets of the plurality of nozzles communicate with the water supply pipe.
[0012] The one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
[0013] The embodiments of the present application provide a wet flue gas desulfurization system, which comprises a stripping tower, an adjusting valve, a deodorizing mechanism, a water washing tank, a first valve, a second valve, a third valve and a desulfurization tower. The stripping tower is used for performing primary treatment on sewage to obtain primary purified water. The adjusting valve is installed on the connecting pipeline between the stripping tower and the sewage treatment plant. The water inlet of the deodorizing mechanism communicates with the water outlet of the stripping tower and is used for deodorizing the primary purified water to obtain secondary purified water. The first valve is arranged on the connecting pipeline between the stripping tower and the deodorizing mechanism. The water washing tank communicates with a fresh water delivery pipe. The second valve and the third valve are installed on the fresh water delivery pipe. The water outlet of the deodorizing mechanism communicates with the fresh water delivery pipe and is located between the second valve and the third valve. The water inlet of the desulfurization tower communicates with the water outlet of the water washing tank. The wet flue gas desulfurization system of the present application can realize the reuse of sewage, reduce the discharge amount of sewage, thereby reducing water environment pollution and improving the utilization rate of water resources. Meanwhile, the present application can reduce the usage amount of fresh water and save water resources. BRIEF DESCRIPTION OF DRAWINGS
[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings described in the following are some embodiments of the present application, and all other embodiments obtained by those of ordinary skill in the art without creative effort based on these drawings are within the scope of the present application.
[0015] Figure 1 The structure schematic diagram of the wet flue gas desulfurization system provided by the embodiments of the present application is shown in the figure.
[0016] Figure 2 The structure schematic diagram of the deodorization mechanism provided by the embodiments of the present application is shown in the figure.
[0017] Icon: 1- stripping tower; 2- regulating valve; 3- deodorization mechanism; 31- support cylinder; 32- adsorbent; 33- wire mesh; 34- vent valve; 35- first pipeline; 36- emptying valve; 37- second pipeline; 4- water washing tank; 5- first valve; 6- second valve; 7- third valve; 8- desulfurization tower; 81- cylinder body; 82- demister; 83- spraying mechanism; 831- water delivery pipe; 832- nozzle; 9- fresh water delivery pipe. DETAILED DESCRIPTION
[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.
[0019] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. The terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements inside. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0020] As Figures 1-2 shown, the utility model embodiment provides a kind of wet flue gas desulfurization system, which includes stripping tower 1, regulating valve 2, deodorization mechanism 3, water washing tank 4, first valve 5, second valve 6, third valve 7 and desulfurization tower 8.Stripping tower 1 is used to carry out primary treatment to sewage and obtain primary purified water.In actual production process, according to the operating parameter of the water quality of fresh water measured, primary purified water after primary treatment by stripping tower 1 is analyzed and compared, and it is found that primary purified water is suitable for replacing fresh water to supplement into water washing tank 4.
[0021] As Figure 1 shown, regulating valve 2 is installed on the connecting pipeline of stripping tower 1 and sewage treatment plant.The water inlet of deodorization mechanism 3 is communicated with the water outlet of stripping tower 1, and is used to deodorize primary purified water and obtain secondary purified water.First valve 5 is arranged on the connecting pipeline of stripping tower 1 and deodorization mechanism 3.Water washing tank 4 and fresh water delivery pipe 9 are communicated.Second valve 6 and third valve 7 are installed on fresh water delivery pipe 9.Third valve 7 is used to adjust the water supplement flow of water washing tank 4.
[0022] Continue to refer to Figure 1 shown, the water outlet of deodorization mechanism 3 is communicated with fresh water delivery pipe 9 and is located between second valve 6 and third valve 7.The water inlet of desulfurization tower 8 is communicated with the water outlet of water washing tank 4.When primary purified water meets the water index of water washing tank 4, close regulating valve 2, open first valve 5, and ensure that second valve 6 is in closed state and third valve 7 is in open state, then primary purified water enters deodorization system to be deodorized and obtain secondary purified water, and secondary purified water enters water washing tank 4 to supplement water for desulfurization tower 8.When primary purified water does not reach the water index of water washing tank 4, open regulating valve 2, close first valve 5, and open second valve 6 to supplement fresh water into desulfurization tower 8.The wet flue gas desulfurization system of the application can realize the reuse of sewage, reduce the discharge amount of sewage, thereby reducing water environmental pollution and improving the utilization rate of water resources.At the same time, the application can reduce the amount of fresh water used, save water resources.
[0023] According to the calculation of 8000 hours of operation of catalytic cracking production device per year, the existing wet flue gas desulfurization system uses 30 tons of fresh water per hour, and after using sewage, the fresh water of wet flue gas desulfurization system is replaced by secondary purified water, which can save 240000 tons of fresh water per year, and reduce the amount of sewage delivery by 240000 tons, which not only saves water resources, but also reduces the discharge amount of sewage, reduces the pollution of water environment, and improves the utilization rate of water resources.
[0024] The utility model discloses an embodiment of a kind of wet flue gas desulfurization system, which comprises stripping tower 1, regulating valve 2, deodorization mechanism 3, water washing tank 4, first valve 5, second valve 6, third valve 7 and desulfurization tower 8.Stripping tower 1 is used to carry out primary treatment to sewage and obtain primary purified water.Regulating valve 2 is installed on the connecting pipeline of stripping tower 1 and sewage treatment plant.The water inlet of deodorization mechanism 3 is communicated with the water outlet of stripping tower 1, for deodorizing primary purified water to obtain secondary purified water.The first valve 5 is arranged on the connecting pipeline of stripping tower 1 and deodorization mechanism 3.Water washing tank 4 and fresh water delivery pipe 9 are communicated.Second valve 6 and third valve 7 are installed on fresh water delivery pipe 9.The water outlet of deodorization mechanism 3 is communicated with fresh water delivery pipe 9 and located between second valve 6 and third valve 7.The water inlet of desulfurization tower 8 is communicated with the water outlet of water washing tank 4.The wet flue gas desulfurization system of the application can realize the reuse of sewage, reduce the discharge amount of sewage, thereby reducing water environmental pollution and improving the utilization rate of water resources.Meanwhile, the application can reduce the use amount of fresh water and save water resources.
[0025] As shown in Figure 2 , deodorization mechanism 3 includes support cylinder 31 and adsorbent 32.The water inlet of support cylinder 31 is communicated with the water outlet of stripping tower 1, and the water outlet of support cylinder 31 is communicated with fresh water delivery pipe 9.Adsorbent 32 is filled in the inner cavity of support cylinder 31.In actual application, primary purified water treated by stripping tower 1 enters support cylinder 31, and the odor of primary purified water is adsorbed by adsorbent 32 to achieve deodorization treatment and obtain secondary purified water.
[0026] As shown in Figure 2 , deodorization mechanism 3 further includes silk screen 33.Silk screen 33 is connected with the inner wall of support cylinder 31, and silk screen 33 is located at the lower part of support cylinder 31.Adsorbent 32 is located above silk screen 33, and the aperture of silk screen 33 is smaller than the diameter of adsorbent 32.Specifically, silk screen 33 can support intact adsorbent 32 and filter damaged adsorbent 32 to gather damaged adsorbent 32 below silk screen 33, so as to avoid the accumulation of damaged adsorbent 32 in intact adsorbent 32 and affect the deodorization effect of deodorization mechanism 3.
[0027] In the embodiment of the application, deodorization mechanism 3 further includes vent valve 34 and first pipeline 35.First pipeline 35 is arranged at the bottom of support cylinder 31 and communicated with the inner cavity of support cylinder 31.Vent valve 34 is installed on first pipeline 35.After deodorization mechanism 3 is used for a period of time, open vent valve 34 to observe the secondary purified water flowing out of first pipeline 35.If the secondary purified water contains damaged adsorbent 32, it indicates that adsorbent 32 is damaged and needs to be supplemented in time.If the secondary purified water contains intact adsorbent 32, it indicates that silk screen 33 is damaged and needs to be repaired or replaced in time.
[0028] In the embodiment of the present application, the deodorizing mechanism 3 further comprises a vent valve 36 and a second pipeline 37. The second pipeline 37 is arranged at the top of the supporting cylinder 31 and communicates with the inner cavity of the supporting cylinder 31. The vent valve 36 is installed on the second pipeline 37. Specifically, when the primary purified water enters the supporting cylinder 31, it may carry air, which will occupy the internal space of the supporting cylinder 31 and cause the air block phenomenon to occur. Therefore, the vent valve 36 is opened after a period of time to discharge the gas in the supporting cylinder 31, so as to avoid the air block phenomenon.
[0029] As shown in Figure 1 , the desulfurization tower 8 comprises a cylinder body 81, a demister 82 and a plurality of spraying mechanisms 83. The cylinder body 81 communicates with the flue gas inlet pipe. The plurality of spraying mechanisms 83 are arranged in the inner cavity of the cylinder body 81 along the height direction of the cylinder body 81. Specifically, the positions of the spraying mechanisms 83 can be adjusted according to different desulfurization processes, and the embodiment of the present application is provided with three spraying mechanisms 83.
[0030] Continuing to refer to Figure 1 , each spraying mechanism 83 communicates with the water washing tank 4 and is used for spraying the alkaline solution. The demister 82 is installed in the cylinder body 81 and is located above the plurality of spraying mechanisms 83 and is used for removing the mist droplets in the flue gas. Specifically, in the embodiment of the present application, high-concentration ammonia water is introduced into the pipeline between the water washing tank 4 and the cylinder body 81, so that the high-concentration ammonia water can be mixed with the water flowing out of the water washing tank 4 to form the alkaline solution. The demister 82 can remove the slurry mist droplets entrained in the flue gas, so that the water droplets in the flue gas are less than 75 mg / Nm 3 .
[0031] Continuing to refer to Figure 1 , the spraying mechanism 83 comprises a water supply pipe 831 and a plurality of nozzles 832. The water supply pipe 831 communicates with the water washing tank 4. The water inlets of the plurality of nozzles 832 communicate with the water supply pipe 831. In actual use, the flue gas vertically enters the cylinder body 81. The water washing tank 4 sends the water to the water supply pipe 831, the water supply pipe 831 sends the water to the nozzles 832, and the spraying liquid sprayed by the nozzles 832 forms a high-density water curtain perpendicular to the entering direction of the flue gas, so as to ensure that the flue gas and the water can be fully contacted, so as to greatly reduce the temperature of the flue gas and generate a part of the sulfurous acid. The flue gas after being cooled moves upward in the cylinder body 81 and is fully mixed with the spraying liquid above, so as to ensure that the SO2 and other acid gases in the flue gas are absorbed. The flue gas after being desulfurized moves upward and is fully mixed with the spraying liquid above, so as to further purify the flue gas. The purified flue gas enters the demister 82 to remove the slurry mist droplets entrained in the flue gas. The water droplets in the flue gas are less than the required value, and then the flue gas is discharged into the atmosphere from the top of the cylinder body 81.
[0032] The various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments.
[0033] The above examples are only used to illustrate the technical solutions of the present application, and are not limited to the present application; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.
Claims
1. A wet flue gas desulfurization system characterized by, The device comprises a stripping tower (1), a regulating valve (2), a deodorization mechanism (3), a water washing tank (4), a first valve (5), a second valve (6), a third valve (7) and a desulfurization tower (8). The stripping tower (1) is used for primary treatment of sewage to obtain primary purified water. The regulating valve (2) is installed on the connecting pipeline between the stripping tower (1) and the sewage treatment plant. The water inlet of the deodorization mechanism (3) is communicated with the water outlet of the stripping tower (1), which is used for deodorization of the primary purified water to obtain secondary purified water. The first valve (5) is arranged on the connecting pipeline between the stripping tower (1) and the deodorization mechanism (3). The water washing tank (4) is communicated with a fresh water delivery pipe (9). The second valve (6) and the third valve (7) are installed on the fresh water delivery pipe (9). The water outlet of the deodorization mechanism (3) is communicated with the fresh water delivery pipe (9) and located between the second valve (6) and the third valve (7). The water inlet of the desulfurization tower (8) is communicated with the water outlet of the water washing tank (4).
2. The wet flue gas desulfurization system of claim 1, wherein The deodorization mechanism (3) comprises a supporting cylinder (31) and an adsorbent (32). The water inlet of the supporting cylinder (31) is communicated with the water outlet of the stripping tower (1), and the water outlet of the supporting cylinder (31) is communicated with the fresh water delivery pipe (9). The adsorbent (32) is filled in the inner cavity of the supporting cylinder (31).
3. The wet flue gas desulfurization system of claim 2, wherein The deodorization mechanism (3) further comprises a silk screen (33). The silk screen (33) is connected with the inner wall of the supporting cylinder (31), and the silk screen (33) is located at the lower part of the supporting cylinder (31). The adsorbent (32) is located above the silk screen (33), and the pore size of the silk screen (33) is smaller than the diameter of the adsorbent (32).
4. The wet flue gas desulfurization system of claim 3, wherein The deodorization mechanism (3) further comprises a vent valve (34) and a first pipeline (35). The first pipeline (35) is arranged at the bottom of the supporting cylinder (31) and communicated with the inner cavity of the supporting cylinder (31). The vent valve (34) is installed on the first pipeline (35).
5. The wet flue gas desulfurization system of claim 2, wherein The deodorization mechanism (3) further comprises an emptying valve (36) and a second pipeline (37). The second pipeline (37) is arranged at the top of the supporting cylinder (31) and communicated with the inner cavity of the supporting cylinder (31). The emptying valve (36) is installed on the second pipeline (37).
6. The wet flue gas desulfurization system of claim 1, wherein The desulfurization tower (8) comprises a cylinder body (81), a demister (82) and a plurality of spraying mechanisms (83). The cylinder body (81) is communicated with a flue gas inlet pipe. The plurality of spraying mechanisms (83) are arranged in the inner cavity of the cylinder body (81) along the height direction of the cylinder body (81). Each spraying mechanism (83) is communicated with the water washing tank (4) and used for spraying alkaline solution. The demister (82) is installed in the cylinder body (81) and located above the plurality of spraying mechanisms (83) and used for removing mist droplets in flue gas.
7. The wet flue gas desulfurization system of claim 6, wherein The spraying mechanism (83) comprises a water delivery pipe (831) and a plurality of nozzles (832). The water delivery pipe (831) is communicated with the water washing tank (4). The water inlets of the plurality of nozzles (832) are in communication with the water delivery pipe (831).