Desulfurizing tower chlorine reduction system

Abstract

The utility model relates to the technical field of waste water treatment, and discloses a desulfurizing tower chlorine reduction system which comprises a desulfurizing absorption tower 1, a standby accident slurry tank 2 and a desulfurizing raw water tank 3, and the standby accident slurry tank 2 can be communicated with the desulfurizing absorption tower 1 through a first pipeline 4 to receive accident slurry. The standby accident slurry tank 2 can be communicated with the desulfurization absorption tower 1 through a third pipeline 6 so as to convey accident slurry, and the desulfurization raw water tank 3 can be communicated with different positions of the standby accident slurry tank 2 in the height direction through a second pipeline 5 so as to receive settled accident slurry. According to the chlorine reduction system of the desulfurizing tower, the standby accident slurry tank is arranged to transfer high-concentration chloride ion wastewater in the desulfurizing absorption tower and treat the high-concentration chloride ion wastewater, so that the content of chloride ions in the desulfurization wastewater is quickly reduced; the desulfurization raw water tank is arranged to collect clarified liquor generated after high-concentration chloride ion wastewater treatment, and the situation that the treated wastewater is directly discharged to the natural environment, so that the environment is polluted, and resources are wasted is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a desulfurization tower chlorine reduction system. Background Art

[0002] As the importance of environmental protection and sustainable development gradually becomes more prominent, zero wastewater discharge has become the goal pursued by many industries and manufacturing companies. Wastewater treatment is a key link in this process, and effectively reducing chloride ions in the desulfurization tower plays an important role in wastewater treatment.

[0003] Desulfurization towers are equipment used to treat sulfur dioxide in flue gas and are usually used in industrial fields with high pollution emissions, such as thermal power plants, steel mills and chemical plants. The chemical reactions involved in the desulfurization tower process will produce a large amount of chloride-containing wastewater, the main component of which is chloride ions. However, chloride ions are a substance that is potentially harmful to the environment. High concentrations of chloride ion emissions can lead to water pollution and ecosystem damage.

[0004] In the prior art, the triple-tank process is usually used to treat desulfurization wastewater. However, there are still many shortcomings in using the triple-tank process alone to treat desulfurization wastewater, such as numerous treatment links, slow treatment process, and high chloride ion content after treatment. In addition, the desulfurization wastewater that meets the discharge standards after treatment by the triple-tank process is generally discharged directly, which is inconsistent with the concept of zero wastewater discharge and greatly causes a waste of resources. Utility Model Content

[0005] The utility model aims to solve the problems in the prior art of slow process of reducing chloride ion content in desulfurization wastewater and discharge of high-concentration chloride ion wastewater into the environment.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a desulfurization tower chlorine reduction system, including a desulfurization absorption tower, a spare emergency slurry tank and a desulfurization raw water tank. The spare emergency slurry tank can be connected to the desulfurization absorption tower through a first pipeline to receive the emergency slurry, the spare emergency slurry tank can be connected to the desulfurization absorption tower through a third pipeline to transport the emergency slurry, and the desulfurization raw water tank can be connected to the spare emergency slurry tank at different positions along the height direction through a second pipeline to receive the precipitated emergency slurry.

[0007] Optionally, the desulfurization absorption tower is connected to a drainage pipeline, and the standby emergency slurry tank is connected to the drainage pipeline via a first pipeline.

[0008] Optionally, a first valve and a pump are provided on the discharge pipeline, and a second valve is provided on the first pipeline.

[0009] Optionally, the first valve and / or the second valve is a stop valve.

[0010] Optionally, the standby emergency slurry tank is provided with a first drain port and a second drain port located at different heights, and the first drain port and the second drain port are respectively provided with a first isolation door and a second isolation door, and the second pipeline includes a main pipe connected to the desulfurization raw water tank and two branch pipes connected to the main pipe, and the two branch pipes are respectively connected to the first isolation door and the second isolation door on the standby emergency slurry tank.

[0011] Optionally, the height of the first drainage port from the ground is 5.5m-5.6m, and the height of the second drainage port from the ground is 3.5m-3.6m.

[0012] Optionally, the standby emergency slurry tank also includes a stirring assembly.

[0013] Optionally, the stirring assembly includes a stirring shaft located inside the spare emergency slurry tank, a plurality of stirring blades arranged on the stirring shaft and spaced apart along the axial direction of the stirring shaft, a first bevel gear fixedly connected to the stirring shaft, a second bevel gear meshing with the first bevel gear, and a drive motor, wherein the drive motor is located outside the spare emergency slurry tank, and its output shaft penetrates into the spare emergency slurry tank and is fixedly connected to the second bevel gear.

[0014] Optionally, a support platform is formed on the outer peripheral surface of the standby emergency slurry tank, and the support platform is used to support the drive motor.

[0015] Optionally, a one-way valve is provided on the third pipeline.

[0016] According to the above technical scheme, the desulfurization tower chlorine reduction system of the utility model transfers and treats the high-concentration chloride ion wastewater in the desulfurization absorption tower by setting up a spare accident slurry tank, thereby quickly reducing the chloride ion content in the desulfurization wastewater; and collects the clarified liquid produced after the precipitation treatment of the high-concentration chloride ion wastewater by setting up a desulfurization raw water tank, thereby avoiding directly discharging the treated wastewater into the natural environment, thereby polluting the environment and wasting resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the first overall structural schematic diagram of the desulfurization tower chlorine reduction system;

[0018] Figure 2 It is the second overall structural schematic diagram of the desulfurization tower chlorine reduction system;

[0019] Figure 3 It is the third overall structural diagram of the desulfurization tower chlorine reduction system;

[0020] Figure 4 It is a schematic diagram of the split structure of the spare emergency slurry tank.

[0021] Description of Reference Numerals

[0022] 1. Desulfurization absorption tower; 2. Spare emergency slurry tank; 21. First isolation door; 22. Second isolation door; 23. Stirring assembly; 231. Stirring shaft; 232. Stirring blade; 233. First bevel gear; 234. Second bevel gear; 235. Drive motor; 24. Support platform; 3. Desulfurization raw water tank; 4. First pipeline; 41. Second valve; 5. Second pipeline; 6. Third pipeline; 7. Drain pipeline; 71. First valve; 72. Pump; 73. First three-way pipe. DETAILED DESCRIPTION

[0023] In the present utility model, unless otherwise stated, directional words such as "up, down, left, right, high, low" are usually understood in conjunction with the directions shown in the drawings and actual applications, and "inside and outside" refer to the inside and outside of the component outline.

[0024] The utility model provides a desulfurization tower chlorine reduction system, comprising a desulfurization absorption tower 1, a standby accident slurry tank 2 and a desulfurization raw water tank 3, the standby accident slurry tank 2 can be connected with the desulfurization absorption tower 1 through a first pipeline 4 to receive the accident slurry, the standby accident slurry tank 2 can be connected with the desulfurization absorption tower 1 through a third pipeline 6 to transport the accident slurry, and the desulfurization raw water tank 3 can be connected to the standby accident slurry tank 2 at different positions along the height direction through a second pipeline 5 to receive the accident slurry after precipitation.

[0025] The standby accident slurry tank 2 is used to temporarily store and process the accident slurry in the desulfurization absorption tower 1 (accident slurry refers to slurry with a chloride ion content greater than 20,000 mg / L). By transferring part of the accident slurry in the desulfurization absorption tower 1, at least an equal amount of non-accident slurry (non-accident slurry refers to slurry with a chloride ion content less than or equal to 20,000 mg / L, including new slurry) can be added to the desulfurization absorption tower 1, thereby quickly reducing the chloride ion content in the desulfurization absorption tower 1. At the same time, the standby accident slurry tank 2 precipitates the accident slurry transferred thereto, and transports the clarified liquid (accident slurry with a solid content of less than 1%) located at the upper layer after precipitation to the desulfurization raw water tank 3 for subsequent use. It should be noted that, in the absence of a spare accident slurry tank 2, the accident slurry in the desulfurization absorption tower 1 can only be processed normally through a triple box or a cyclone, which is a single-path processing mode, so the processing process is relatively slow; while with a spare accident slurry tank 2, the accident slurry can be processed simultaneously in multiple ways and thus the processing process is accelerated. In addition, the spare accident slurry tank 2 can not only retain and replace the accident slurry to balance the chloride ion content in the desulfurization absorption tower 1, but also can be used to temporarily store non-accident slurry with normal slurry indicators when the desulfurization absorption tower 1 needs to be overhauled, and all non-accident slurry will be transported back in reverse after the desulfurization absorption tower 1 is overhauled.

[0026] Combination Figure 1The following describes the working process of treating the accident slurry through the spare accident slurry tank 2: when the chloride ion content of the slurry in the desulfurization absorption tower 1 is greater than 20,000 mg / L and the spare accident slurry tank 2 is in an empty state, part of the slurry in the desulfurization absorption tower 1 is transported to the spare accident slurry tank 2 through the first pipeline 4, and the slurry pouring is stopped when the slurry in the desulfurization absorption tower 1 and the spare accident slurry tank 2 are at a suitable height. At this time, non-accident slurry is transported to the desulfurization absorption tower 1 to quickly balance the chloride ion content in the slurry (the accident slurry and non-accident slurry are mixed to dilute the remaining accident slurry in the desulfurization absorption tower 1, and reduce the chloride ion content of the entire slurry to less than 20000 mg / L); the slurry in the standby accident slurry tank 2 is precipitated for about 24 hours, and the part of the slurry with a solid content of less than 1% (generally the upper slurry) after precipitation is transported to the desulfurization raw water tank 3 through the second pipeline 5, and the part with a solid content greater than or equal to 1% is retained in the standby accident slurry tank 2, and when the time is right (for example, when the chloride ion content of the slurry in the desulfurization absorption tower 1 is low or the slurry in the desulfurization absorption tower 1 itself has a low content), it is reversely transported to the desulfurization absorption tower 1 through the third pipeline 6. Overall, the process of returning the slurry received from the desulfurization absorption tower 1 to the desulfurization absorption tower 1 is one of the links to maintain the dynamic balance of chloride ions in the slurry.

[0027] Furthermore, there can be multiple desulfurization absorption towers 1, and the multiple desulfurization absorption towers 1 connected to the spare accident slurry tank 2 will be more conducive to maintaining the dynamic balance of chloride ions in the slurry, and enhancing the stability of the desulfurization tower chlorination reduction system as a whole. Specifically, when an accident slurry appears in one of the desulfurization absorption towers 1, after the accident slurry is partially discharged to the spare accident slurry tank 2, in addition to directly adding new slurry to the desulfurization absorption tower 1 where the slurry index is abnormal, the non-accident slurry in other desulfurization absorption towers 1 can also be transferred to the desulfurization absorption tower 1, or both methods can be used.

[0028] Optionally, the desulfurization absorption tower 1 is connected to a drainage pipeline 7 , and the standby emergency slurry tank 2 is connected to the drainage pipeline 7 via a first pipeline 4 .

[0029] Specifically, the other end of the drainage pipeline 7 can be connected to a triple box or a cyclone. Furthermore, when the desulfurization wastewater treatment process of the triple box is used to treat the desulfurization wastewater in the desulfurization absorption tower 1, the triple box can be used only as a preliminary treatment system, and a deep treatment system connected to the triple box can be set up to better treat the desulfurization wastewater. Considering that the triple box and the cyclone are both disclosed in the prior art, they will not be elaborated here. The first pipeline 4 can be connected to the drainage pipeline 7 by welding, flange connection, clamp connection and other methods. Of course, the two can also be set independently.

[0030] Optionally, a first valve 71 and a first pump 72 are provided on the discharge pipeline 7 , and a second valve 41 is provided on the first pipeline 4 .

[0031] like Figure 1-2 As shown, the first pipeline 4 is connected to the first three-way pipe 73 of the discharge pipeline 7 through the second valve 41, and the other two ends of the first three-way pipe 73 are respectively connected to the first valve 71 and the first pump 72. This arrangement allows the first pipeline 4 and the discharge pipeline 7 to share the pump 72, which is conducive to simplifying the structure and saving costs. Furthermore, the first pump 72 can be a power pump, such as Figure 1-3 It is worth mentioning that the number and location of valves and pumps on the first pipeline 4 and the discharge pipeline 7 can be adjusted according to actual conditions. For example, the first three-way pipe 73 can be replaced by three straight pipes connected together by a three-way valve.

[0032] Optionally, the first valve 41 and / or the second valve 71 is a stop valve.

[0033] Specifically, the first valve 41 and the second valve 71 may both be stop valves or one of them may be a stop valve and the other may be other types of valves, such as butterfly valves, gate valves, etc. Of course, the first valve 41 and the second valve 71 may both be other types of valves except stop valves.

[0034] Optionally, the standby emergency slurry tank 2 is provided with a first drain port and a second drain port located at different heights, and the first drain port and the second drain port are respectively provided with a first isolation door 21 and a second isolation door 22, and the second pipeline 5 includes a main pipe connected to the desulfurization raw water tank 3 and two branch pipes connected to the main pipe, and the two branch pipes are respectively connected to the first isolation door and the second isolation door on 2.

[0035] The drain port is used to discharge slurry (clarified liquid) with a solid content of less than 1%, and the isolation door is used to control whether the drain port is drained or not. Specifically, the first drain port and the second drain port are at different heights relative to the ground, and the first drain port is higher than the second drain port. After the accident slurry in the standby accident slurry tank 2 is precipitated for about 24 hours, the state of the slurry at the location of the first drain port and the second drain port is observed. If it looks clear to the naked eye, it can be basically determined that its solid content is less than 1%, and it belongs to the clarified liquid that can be transported to the desulfurization raw water tank 3 through the second pipeline 5. Further, in order to better observe the state of the slurry at the location of the first drain port and the second drain port, an observation port can be set on the first isolation door 21 and the second isolation door 22, or the first isolation door 21 and the second isolation door 22 can be made of colorless and transparent materials. Further, if necessary or as a preparatory means, a sampling port can also be set on the first isolation door 21 and the second isolation door 22 to facilitate the detection of slurry parameters at the corresponding position.

[0036] Furthermore, the connection position between the desulfurization raw water tank 3 and the main pipe of the second pipeline 5 can be lower than the connection position between the first isolation door and the second isolation door and the two branches of the second pipeline 5. This pipeline arrangement can realize the use of liquid level difference to transport clarified liquid. For example, Figure 1-3 As shown, the main pipe of the second pipeline 5 is a bent pipe with two ports, one high and one low. In addition, the two branch pipes of the second pipeline 5 can also be replaced by a second three-way pipe.

[0037] Optionally, the height of the first drainage port from the ground is 5.5m-5.6m, and the height of the second drainage port from the ground is 3.5m-3.6m.

[0038] According to actual operating experience, it is more appropriate to set the first drain port and the second drain port at a position about 5.5m and 3.5m above the ground or the bottom of the standby emergency slurry tank 2, respectively. If the first drain port is set at a position higher than 5.5m, the total solid content in the retained slurry after the accident slurry is precipitated and the clarified liquid is transported will be relatively high, resulting in a corresponding increase in the solids deposited at the bottom of the standby emergency slurry tank 2 and causing blockage; if the second drain port is set at a position lower than 3.5m, the solid content of the slurry at the corresponding place after precipitation is basically greater than 1%, thereby fundamentally failing to achieve the purpose of discharging the clarified liquid through the drain port.

[0039] Optionally, the standby emergency slurry tank 2 further includes a stirring assembly 23 .

[0040] The purpose of setting the stirring component is to prevent the standby accident slurry tank 2 from being blocked. Specifically, in the process of settling the accident slurry, a portion of the solids in the slurry will be deposited at the bottom of the standby accident slurry tank 2, which will easily block the standby accident slurry tank 2 over time. Generally speaking, the stirring component needs to be started each time the standby accident slurry tank 2 settles the accident slurry and transports the clarified liquid, so that the solids in the retained slurry are re-suspended to avoid blockage due to deposition. The stirred slurry can be transported back to the desulfurization absorption tower 1 through the third pipeline 6. Furthermore, the standby accident slurry tank 2 can be connected to the fourth pipeline at a position close to its bottom. The fourth pipeline is used to discharge the slurry that is not suitable for transporting back to the desulfurization absorption tower 1 due to excessively high solid content to the high-efficiency thickening tank or the slag remover for separate treatment.

[0041] In some embodiments, the standby emergency slurry tank 2 further includes a stirring assembly 23, and the height of the first drain port from the ground is 5.5m-5.6m, and the height of the second drain port from the ground is 3.5m-3.6m.

[0042] Specifically, if the height of the first liquid discharge port from the ground is too high, the retained slurry after settling the accident slurry and transporting the clarified liquid will increase the difficulty of stirring due to the excessively high total solid content therein, thereby affecting the normal operation of the stirring component, such as the stirring component being overloaded for a long time.

[0043] Optionally, the stirring assembly 23 includes a stirring shaft 231 located inside the spare emergency slurry tank 2, a plurality of stirring blades 232 arranged on the stirring shaft 231 and distributed along the axial direction of the stirring shaft 231, a first bevel gear 233 fixedly connected to the stirring shaft 231, a second bevel gear 234 meshing with the first bevel gear 233, and a drive motor 235. The drive motor 235 is located outside the spare emergency slurry tank 2, and its output shaft penetrates into the spare emergency slurry tank 2 and is fixedly connected to the second bevel gear 234.

[0044] Optionally, a support platform 24 is formed on the outer peripheral surface of the standby emergency slurry tank 2 , and the support platform 24 is used to support the driving motor 235 .

[0045] Specifically, the support platform 24 is located at the bottom of the standby emergency slurry tank 2, and the drive motor 235 is fixedly connected to the support platform 24. The drive motor 235 is fixedly connected to the support platform 24, which is beneficial to the stability of the overall structure of the standby emergency slurry tank 2.

[0046] Optionally, a one-way valve is provided on the third pipeline 6 .

[0047] The purpose of setting the one-way valve is to make the third pipeline 6 as a special return pipeline, so as to keep it relatively independent and not affected by other pipelines. Through the third pipeline, only the slurry can be transported from the standby emergency slurry tank 2 to the desulfurization absorption tower 1 in one direction.

[0048] Combination Figure 1-4 Describe the complete workflow of the desulfurization tower chlorine reduction system:

[0049] When the chloride ion content of the slurry in the desulfurization absorption tower 1 is greater than 20000 mg / L and the standby accident slurry tank 2 is in an empty state, the second valve 41 is opened, and the accident slurry in the desulfurization absorption tower 1 is transported to the standby accident slurry tank 2 through the drainage pipeline 7 and the first pipeline 4. When the accident slurry in the standby accident slurry tank 2 is close to 10m high, the second valve 41 is closed to stop the transportation. Next, non-accident slurry is added to the desulfurization absorption tower 1 that has discharged part of the accident slurry to quickly balance the chloride ion content in the slurry. When the chloride ion content in the slurry is less than or equal to 20000 mg / L, the addition of non-accident slurry is stopped, and the desulfurization absorption tower 1 resumes normal operation. On the other hand, the accident slurry in the standby accident slurry tank 2 is precipitated. After precipitation for about 24 hours, the slurry state at the first drainage port and the second drainage port is observed or detected, mainly to determine whether the solid content in the slurry is less than 1%. Generally, two situations may occur here: the solid content of the slurry at the first and second drain ports is less than 1% or the solid content of the slurry at the first drain port is less than 1% and the solid content of the slurry at the second drain port is greater than or equal to 1%. According to the above two situations, only the first isolation door 21 is opened or the first isolation door 21 and the second isolation door 22 are opened, and the clarified liquid (i.e., the slurry with a solid content of less than 1%) is transported to the main pipe of the second pipeline 5 through the branch pipe of the second pipeline 5, and the clarified liquid in the main pipe will eventually be transported to the desulfurization raw water tank 3. The clarified liquid collected in the desulfurization raw water tank 3 can be used as flushing water for equipment or equipment pipelines, etc. When the clarified liquid is discharged, the isolation door is closed and the stirring component 23 in the standby accident slurry tank 2 is started to stir the retained slurry, and the stirred slurry is transported back to the desulfurization absorption tower 1 through the third pipeline 6. Finally, the standby accident slurry tank 2 is emptied to prepare for its next operation.

[0050] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A desulfurization tower chlorine reduction system, characterized in that: The invention comprises a desulfurization absorption tower (1), a standby emergency slurry tank (2) and a desulfurization raw water tank (3); the standby emergency slurry tank (2) can be connected to the desulfurization absorption tower (1) through a first pipeline (4) to receive the emergency slurry; the standby emergency slurry tank (2) can be connected to the desulfurization absorption tower (1) through a third pipeline (6) to transport the emergency slurry; the desulfurization raw water tank (3) can be connected to the standby emergency slurry tank (2) at different positions along the height direction through a second pipeline (5) to receive the precipitated emergency slurry.

2. The desulfurization tower chlorine reduction system according to claim 1, characterized in that: The desulfurization absorption tower (1) is connected to a drainage pipeline (7), and the standby emergency slurry tank (2) is connected to the drainage pipeline (7) via the first pipeline (4).

3. The desulfurization tower chlorine reduction system according to claim 2, characterized in that: The liquid discharge pipeline (7) is provided with a first valve (71) and a pump (72), and the first pipeline (4) is provided with a second valve (41).

4. The desulfurization tower chlorine reduction system according to claim 3, characterized in that: The first valve (71) and / or the second valve (41) are stop valves.

5. The desulfurization tower chlorine reduction system according to claim 1, characterized in that: The standby emergency slurry tank (2) is provided with a first drain port and a second drain port located at different heights, the first drain port and the second drain port are respectively provided with a first isolation door (21) and a second isolation door (22), the second pipeline (5) comprises a main pipe connected to the desulfurization raw water tank (3) and two branch pipes connected to the main pipe, the two branch pipes are respectively connected to the first isolation door (21) and the second isolation door (22) on the standby emergency slurry tank (2).

6. The desulfurization tower chlorine reduction system according to claim 5, characterized in that: The height of the first drain port from the ground is 5.5m-5.6m, and the height of the second drain port from the ground is 3.5m-3.6m.

7. The desulfurization tower chlorine reduction system according to claim 1, characterized in that: The standby emergency slurry tank (2) further comprises a stirring assembly (23).

8. The desulfurization tower chlorine reduction system according to claim 7, characterized in that: The stirring assembly (23) comprises a stirring shaft (231) located inside the standby emergency slurry tank (2), a plurality of stirring blades (232) arranged on the stirring shaft (231) and spaced apart along the axial direction of the stirring shaft (231), a first bevel gear (233) fixedly connected to the stirring shaft (231), a second bevel gear (234) meshing with the first bevel gear (233), and a driving motor (235); the driving motor (235) is located outside the standby emergency slurry tank (2), and its output shaft penetrates into the standby emergency slurry tank (2) and is fixedly connected to the second bevel gear (234).

9. The desulfurization tower chlorine reduction system according to claim 8, characterized in that: A support platform (24) is formed on the outer peripheral surface of the standby emergency slurry tank (2), and the support platform (24) is used to support the drive motor (235).

10. The desulfurization tower chlorine reduction system according to claim 1, characterized in that: The third pipeline (6) is provided with a one-way valve.

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