Waste gas defluorination device
By installing a defluorinating agent injection structure and a return pipe inside the tower, the defluorinating agent can be recycled, solving the problem that existing devices cannot be recycled, reducing costs and improving defluorination efficiency.
Patent Information
- Application Number
- CN202421109044.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-20
AI Technical Summary
Existing defluorination devices cannot recycle defluorinating agents, resulting in high costs and low adsorption efficiency.
A waste gas defluorination device was designed, comprising a tower body, an air inlet, a feeding port, a circulating liquid inlet, and an exhaust port. Defluorinating agent is injected into the tower body using first and second defluorinating agent injection structures, reacting with the fluorine-containing waste gas. The defluorinating agent is recycled through a return pipe, reducing consumption.
This enables the recycling of defluorinating agents, reduces costs, improves defluorination efficiency, and reduces resource waste and environmental pollution.
Smart Images
Figure CN222342492U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of waste gas treatment, in particular to a waste gas defluorination device. Background Art
[0002] Fluorine-containing waste gas emitted during thermal power generation and industrial production is one of the main air pollutants that cause atmospheric environmental pollution and health hazards. Excessive fluoride has a strong toxic effect on plants, animals and humans. The emission of fluorine-containing waste gas will directly pollute the atmosphere, reduce air quality, and pose a threat to the respiratory health of surrounding residents.
[0003] Existing defluorination devices mainly use adsorbents such as aluminum oxide, magnesium oxide, and calcium oxide. The defluorination devices do not have components with regeneration functions, which makes the defluorination agents non-recyclable. At the same time, solid adsorbents have low adsorption efficiency and high reagent consumption, resulting in high costs. Utility Model Content
[0004] Therefore, in order to overcome at least some of the defects and shortcomings of the prior art, the embodiments of the present invention propose a waste gas defluorination device to solve the shortcomings of the existing waste gas defluorination device, such as the inability to recycle the defluorination agent and the high cost.
[0005] An exhaust gas defluorination device proposed in an embodiment of the utility model comprises: a tower body, on which an air inlet, a feeding port, a circulating infusion port and an exhaust port are provided, the air inlet, the feeding port, the circulating infusion port and the exhaust port are respectively connected to the tower body, and the exhaust port is arranged at the top of the tower body; a first defluorination agent injection structure is arranged inside the tower body, and the first defluorination agent injection structure is arranged close to the top of the tower body; a fluorine content detector is arranged inside the tower body, and the fluorine content detector is located on a side of the first defluorination agent injection structure close to the exhaust port; a reflux pipe is connected between the feeding port and the circulating infusion port; wherein, the first defluorination agent injection structure is located between the air inlet and the exhaust port, the feeding port is opened on the side wall of the tower body, and the feeding port is connected to the first defluorination agent injection structure, the circulating infusion port is arranged on the side wall of the tower body, and the circulating infusion port is arranged close to the bottom of the tower body.
[0006] In one embodiment of the utility model, it also includes: a second defluorinating agent injection structure, which is arranged inside the tower body, the second defluorinating agent injection structure is located between the fluorine content detector and the exhaust port, and the second defluorinating agent injection structure is connected to the feeding port.
[0007] In one embodiment of the present invention, the second defluorination agent injection structure and the first defluorination agent injection structure are arranged alternately.
[0008] In one embodiment of the utility model, it further comprises: a material collector connected to the bottom of the tower body, a material collection port is arranged on one side of the material collector close to the bottom of the tower body, and the material collection port is connected to the tower body.
[0009] In one embodiment of the utility model, it also includes: a first observation window, which is arranged on the tower body, and the first observation window is arranged close to the circulating infusion port.
[0010] In one embodiment of the utility model, it also includes: a second observation window, which is arranged on the side wall of the material collector.
[0011] In one embodiment of the utility model, it also includes: a defluorination slag collection tank connected to the aggregate port; an alkali wash collection tank connected to the defluorination slag collection tank; and a fluoride solution collection tank connected to the defluorination slag collection tank.
[0012] In one embodiment of the utility model, it also includes: a circulating liquid collection pool connected to the circulating infusion port.
[0013] In one embodiment of the utility model, it also includes: an air induced duct connected to the exhaust port; and an air induced fan arranged on the air induced duct.
[0014] In one embodiment of the utility model, it further comprises: a demister, which is arranged inside the tower body, and the demister is arranged close to the top of the tower body.
[0015] It can be seen from the above that the above technical features of the utility model can have the following beneficial effects:
[0016] In this embodiment, an air inlet is provided on the tower body to introduce fluorine-containing waste gas, and a feeding port is provided on the tower body to convey the defluorinating agent to the first defluorinating agent injection structure in the tower body. The first defluorinating agent injection structure injects the defluorinating agent to cause a defluorination reaction between the fluorine-containing waste gas and the defluorinating agent to remove the fluorine in the waste gas. After the fluorine content detector detects that the gas in the tower body meets the standard, it is discharged from the exhaust port. In addition, in this embodiment of the utility model, a circulating infusion port is provided on the tower body, and a reflux pipe is provided to connect the circulating infusion port and the feeding port. The reflux pipe conveys the liquid generated by the defluorination reaction in the tower body and the unreacted defluorinating agent from the circulating infusion port to the feeding port and then to the first defluorinating agent injection structure, thereby realizing recycling, reducing the consumption of the defluorinating agent, and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 A schematic structural diagram of a waste gas defluorination device provided in an embodiment of the utility model.
[0019] [Description of Reference Numerals]
[0020] 10: waste gas defluorination device; 100: tower body; 101: demister; 102: collector; 110: air inlet; 120: feeding port; 130: circulating infusion port; 140: collecting port; 150: exhaust port; 151: induced draft duct; 152: induced draft fan; 210: first defluorination agent injection structure; 220: second defluorination agent injection structure; 300: fluorine content detector; 400: reflux pipe; 410: circulation pump; 510: first observation window; 520: second observation window; 600: defluorination slag collection tank; 700: alkali washing material collection tank; 800: fluoride solution collection tank; 900: circulating liquid collection tank. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] The embodiment of the utility model provides a waste gas defluorination device 10, which is suitable for treating fluorine-containing waste gas, is easy to operate, reduces manual intervention, reduces operating costs, and can recycle defluorination agents to reduce the consumption of defluorination agents. In order to more clearly describe the waste gas defluorination device 10 provided in this embodiment, the waste gas defluorination device 10 is used to perform waste gas defluorination using alkaline washed zirconium sulfate as a defluorination agent as an example for specific description.
[0023] like Figure 1 As shown, the exhaust gas defluorination device 10 provided in the embodiment of the utility model includes, for example, a tower body 100 , a first defluorination agent injection structure 210 , a fluorine content detector 300 , a collector 102 and a reflux pipe 400 .
[0024] Specifically, the air inlet 110 is, for example, arranged in the middle of the tower body 100, the feed port 120 is, for example, opened on the side wall of the tower body 100, the feed port 120 and the air inlet 110 are, for example, arranged opposite to each other and the feed port 120 is used to add the defluorinating agent into the interior of the tower body 100, the circulating liquid infusion port 130, the collecting port 140 and the exhaust port 150 are arranged on the tower body 100 and are respectively connected to the tower body 100, the exhaust port 150 is, for example, arranged at the top of the tower body 100, and the air inlet 110 is, for example, arranged between the first defluorinating agent injection structure 210 and the collecting device 102. Among them, the positions of the air inlet 110, the feed port 120, the circulating liquid infusion port 130, the collecting port 140 and the exhaust port 150 can be arranged according to the actual structure of the device, and are not specifically limited here.
[0025] The first defluorinating agent injection structure 210 is, for example, disposed inside the tower body 100, the first defluorinating agent injection structure 210 is, for example, disposed near the top of the tower body 100, and the first defluorinating agent injection structure 210 includes, for example, a plurality of connected nozzles, for injecting the defluorinating agent into the tower body 100, so that the fluorine-containing waste gas in the tower body 100 reacts with the defluorinating agent to achieve defluorination of the waste gas. In some embodiments, the first defluorinating agent injection structure 210 is, for example, located between the air inlet 110 and the exhaust port 150, and the feed port 120 is connected to the first defluorinating agent injection structure 210, and the feed port 120 is used to transport the defluorinating agent to the first defluorinating agent injection structure 210.
[0026] The fluorine content detector 300 is, for example, disposed inside the tower body 100. The fluorine content detector 300 is, for example, located on a side of the first defluorination agent injection structure 210 close to the exhaust port 150. The fluorine content detector 300 is used to detect whether the gas in the tower body 100 close to the exhaust port 150 meets the standards. Meeting the standards refers to the standards for dischargeable gas that meet the fluorine content standards. The gas that meets the standards can be discharged from the exhaust port 150. This embodiment uses the fluorine content detector 300 to monitor the fluorine content in the tower body 100 in real time to ensure that the defluorination effect achieves the expected goal.
[0027] The circulating liquid infusion port 130 is, for example, arranged on the side wall of the tower body 100, and the circulating liquid infusion port 130 is arranged near the collector 102. The reflux pipe 400 is, for example, connected between the feeding port 120 and the circulating liquid infusion port 130, and the reflux pipe 400 is used to transport the liquid from the circulating liquid infusion port 130 to the feeding port 120, so as to realize the recycling of the defluorinating agent, wherein the liquid includes the unreacted defluorinating agent and the liquid generated by the defluorinating agent and the fluorine-containing waste gas in the tower body 100 undergoing the defluorination reaction. For example, taking the defluorinating agent as an alkaline washed zirconium sulfate solution as an example, part of the alkaline washed zirconium sulfate solution reacts with fluorine to generate zirconium fluoride solid and fluoride salt solution, and the unreacted alkaline washed zirconium sulfate solution and the fluoride salt solution generated by the defluorination reaction are transported from the circulating liquid infusion port 130 to the feeding port 120 through the reflux pipe 400 and recycled, thereby reducing the amount of new defluorinating agent added and improving the use efficiency of the defluorinating agent. It is obtained through experiments that the alkaline washed zirconium sulfate solution added each time can be recycled twice before being discharged. The reflux pipe 400 is provided with a circulation pump 410, which is a centrifugal pump or other type of pump, and its selection depends on the properties of the liquid defluorinating agent and the specific requirements of the circulation structure, which are not limited here. The circulation pump 410 is used to drive the liquid to flow in the reflux pipe 400.
[0028] Specifically, the exhaust gas defluorination device 10 further includes a circulating liquid collection tank 900, which is connected to the circulating liquid infusion port 130. When the defluorination agent is circulated for the maximum effective number of cycles, the valve can be opened to allow the circulating liquid infusion port 130 to transport the recycled defluorination agent and the reaction solution in the tower body 100 to the circulating liquid collection tank 900 for further treatment.
[0029] The embodiment of the utility model introduces fluorine-containing waste gas by setting an air inlet 110 on the tower body 100, and sets a feeding port 120 on the tower body 100 to convey the defluorinating agent to the first defluorinating agent injection structure 210 in the tower body 100. The first defluorinating agent injection structure 210 injects the defluorinating agent, so that the fluorine-containing waste gas and the defluorinating agent react to remove fluorine in the waste gas, and after the fluorine content detector 300 detects that the gas in the tower body 100 meets the standard, it is discharged from the exhaust port 150. In addition, the embodiment of the utility model opens a circulating infusion port 130 on the tower body 100, and sets a reflux pipe 400 to connect the circulating infusion port 130 and the feeding port 120. The reflux pipe 400 conveys the liquid generated by the defluorination reaction in the tower body 100 and the unreacted defluorinating agent from the circulating infusion port 130 to the feeding port 120 and to the first defluorinating agent injection structure 210, so as to realize recycling, reduce the consumption of the defluorinating agent, and reduce the cost.
[0030] Specifically, the waste gas defluorination device 10, for example, also includes a second defluorination agent injection structure 220, and the second defluorination agent injection structure 220, for example, has the same structure as the first defluorination agent injection structure 210, and the details are not repeated here. The second defluorination agent injection structure 220, for example, is arranged inside the tower body 100, and the second defluorination agent injection structure 220 is located between the fluorine content detector 300 and the exhaust port 150, and the second defluorination agent injection structure 220 is connected to the feed port 120. The second defluorination agent injection structure 220 is used to defluorinate the fluorine-containing gas, to ensure that the fluorine-containing waste gas defluorinated by the first defluorination agent injection structure 210 is further defluorinated, and to ensure that the fluorine content of the gas discharged from the exhaust port 150 meets the discharge standard.
[0031] Specifically, the second defluorinating agent injection structure 220 and the first defluorinating agent injection structure 210 are, for example, staggered. By staggering, the second defluorinating agent injection structure 220 and the first defluorinating agent injection structure 210 can cover a larger spatial area, thereby increasing the chance of fluorine-containing waste gas contacting the defluorinating agent and improving the removal efficiency. The staggered structure helps to avoid insufficient or excessive local treatment.
[0032] Specifically, the waste gas defluorination device 10 further includes a collector 102, which is a funnel-shaped structure, for example. The collector 102 is used to collect the products generated by the defluorination agent and the fluorine-containing waste gas and the unreacted defluorination agent in the tower body 100, wherein the defluorination agent is sprayed by the first defluorination agent injection structure 210 and the second defluorination agent injection structure 220. The collector 102 is, for example, integrally formed with the bottom of the tower body 100. In other embodiments, the collector 102 can also be separately arranged at the bottom of the tower body 100 and connected to the tower body 100, which is not specifically limited here. The collection port 140 is, for example, arranged on one side of the collector 102 close to the bottom of the tower body 100, and the collection port 140 is used to allow the material collected by the collector 102 to flow out of the tower body 100.
[0033] Specifically, the exhaust gas defluorination device 10, for example, also includes a first observation window 510. The first observation window 510 is, for example, a transparent window opened on the tower body 100. The first observation window 510 is, for example, arranged near the circulating infusion port 130. The first observation window 510 is used to enable the operator to intuitively observe the situation near the circulating infusion port 130 through the first observation window 510, including the height of the liquid, the color of the liquid, the flow state, etc.
[0034] Specifically, the exhaust gas defluorination device 10, for example, also includes a second observation window 520. The second observation window 520 is, for example, a transparent window opened on the side wall of the collector 102. The operator can visually observe the reaction products collected by the collector 102 through the second observation window 520. Taking the defluorination agent as alkaline-washed zirconium sulfate as an example, the reaction products are, for example, zirconium fluoride solid and fluoride solution, so as to evaluate the efficiency of the defluorination process and assist the operator in making further operational decisions. For example, by observing the amount of material in the collector 102, the operator can open the collector port 140 by opening the valve, so that the material in the collector 102 flows out of the tower body 100, so that the material can be further processed.
[0035] Specifically, the exhaust gas defluorination device 10, for example, further includes a defluorination slag collection pool 600, an alkali wash collection pool 700, and a fluoride solution collection pool 800. The defluorination slag collection pool 600, for example, is connected to the aggregate port 140. The alkali wash collection pool 700, for example, is connected to the defluorination slag collection pool 600. The fluoride solution collection pool 800, for example, is connected to the defluorination slag collection pool 600. The defluorination slag collection pool 600 is used to collect the reaction products collected in the aggregate container 102. Taking the defluorination agent as alkali washed zirconium sulfate as an example, the reaction products are, for example, zirconium fluoride solid and fluoride solution.
[0036] Further, the reaction product collected in the defluorination slag collection tank 600 is separated into solid and liquid, and the separated solid is collected by the alkali washing collection tank 700. The collection in the alkali washing collection tank 700 can be recycled. For example, alkali washed zirconium sulfate is used as a defluorination agent. The zirconium fluoride generated after the alkali washed zirconium sulfate and the fluorine-containing wastewater undergo a defluorination reaction. The alkali solution is added to the alkali washing collection tank 700. The collection in the alkali washing collection tank 700 (such as zirconium fluoride) is backwashed to obtain zirconium dioxide. Sulfuric acid is added to the alkali washing collection tank 700 to obtain regenerated alkali washed zirconium sulfate. The regenerated alkali washed zirconium sulfate can be used for defluorination of fluorine-containing wastewater, which reduces resource waste and has better economic and environmental benefits. The liquid of the solid-liquid separation of the reaction product collected in the defluorination slag collection tank 600 is, for example, a fluoride solution, which is collected in the fluoride solution collection tank 800. The fluoride solution collected in the fluoride solution collection tank 800 can be processed for recycling, reducing environmental pollution.
[0037] Specifically, the exhaust gas defluorination device 10 further includes, for example, an induced draft pipe 151 and an induced draft fan 152. The induced draft pipe 151 is, for example, connected to the exhaust port 150. The induced draft fan 152 is, for example, disposed on the induced draft pipe 151. The induced draft fan 152 generates negative pressure on the induced draft pipe 151 to help extract the gas in the tower body 100. The induced draft pipe 151 is usually connected to the exhaust port 150 to ensure that the gas after defluorination treatment is discharged from the exhaust port 150, thereby ensuring the continuous operation of the device.
[0038] Specifically, the exhaust gas defluorination device 10 further includes a demister 101, which is disposed inside the tower body 100, and is disposed near the top of the tower body 100. The demister 101 is used to dry the gas, and specifically, the demister 101 is used to dry the gas near the top of the tower body 100, so that the gas after the defluorination reaction is dried and discharged.
[0039] Among them, in order to remove fluorine in fluorine-containing waste gas, alkaline washed zirconium sulfate is used as a defluorinating agent for example, and the alkaline washed zirconium sulfate reacts with the fluorine-containing waste gas to defluorinate. During the defluorination reaction, the alkaline washed zirconium sulfate reacts chemically with the fluorine in the fluorine-containing waste gas, and the generated products include, for example, zirconium fluoride (ZrF4) or other fluorine-containing composite salts. Alkaline solution is added to the zirconium fluoride for backwashing treatment, and the products generated by the backwashing treatment include, for example, zirconium dioxide and fluoride solution. The zirconium dioxide can be acidified and transformed with sulfuric acid to generate regenerated alkaline washed zirconium sulfate, and the fluoride solution can be further treated for recycling.
[0040] It should be noted that alkaline-washed zirconium sulfate, as an effective defluorination agent, can react with fluoride in waste gas to remove fluorine, thereby removing fluorine from fluorine-containing waste gas. The zirconium fluoride produced by the defluorination reaction is added to alkaline solution for backwashing. The zirconium dioxide obtained by backwashing is acidified and transformed with sulfuric acid, and can be regenerated into basic zirconium sulfate. This recycling reduces the demand for new materials and reduces costs. In addition, the entire treatment process generates less waste, which can be effectively collected and treated, reducing the impact on the environment.
[0041] In addition, it can be understood that the aforementioned embodiments are merely illustrative descriptions of the present invention. Under the premise that the technical features do not conflict, the structures do not contradict, and the purpose of the present invention is not violated, the technical solutions of the various embodiments can be arbitrarily combined and used in combination.
[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.
Claims
1. A waste gas defluorination device (10), characterized in that: include: A tower body (100), wherein the tower body (100) is provided with an air inlet (110), a feed port (120), a circulating liquid infusion port (130) and an exhaust port (150), wherein the air inlet (110), the feed port (120), the circulating liquid infusion port (130) and the exhaust port (150) are respectively connected to the tower body (100), and the exhaust port (150) is arranged at the top of the tower body (100); A first defluorinating agent injection structure (210) is disposed inside the tower body (100), wherein the first defluorinating agent injection structure (210) is disposed close to the top of the tower body (100); A fluorine content detector (300) is arranged inside the tower body (100), and the fluorine content detector (300) is located on a side of the first defluorination agent injection structure (210) close to the exhaust port (150); A reflux pipe (400) connected between the feed port (120) and the circulating infusion port (130); The first defluorinating agent injection structure (210) is located between the air inlet (110) and the air outlet (150), the feed port (120) is provided on the side wall of the tower body (100), and the feed port (120) is connected to the first defluorinating agent injection structure (210), and the circulating liquid infusion port (130) is provided on the side wall of the tower body (100), and the circulating liquid infusion port (130) is provided close to the bottom of the tower body (100).
2. The exhaust gas defluorination device (10) according to claim 1, characterized in that: Also includes: A second defluorinating agent injection structure (220) is arranged inside the tower body (100), the second defluorinating agent injection structure (220) is located between the fluorine content detector (300) and the exhaust port (150), and the second defluorinating agent injection structure (220) is connected to the feed port (120).
3. The exhaust gas defluorination device (10) according to claim 2, characterized in that: The second defluorinating agent injection structure (220) and the first defluorinating agent injection structure (210) are arranged alternately.
4. The exhaust gas defluorination device (10) according to claim 1, characterized in that: Also includes: A material collector (102) is connected to the bottom of the tower body (100); a material collection port (140) is provided on one side of the material collector (102) close to the bottom of the tower body (100); and the material collection port (140) is connected to the tower body (100).
5. The exhaust gas defluorination device (10) according to claim 1, characterized in that: Also includes: A first observation window (510) is provided on the tower body (100), and the first observation window (510) is provided close to the circulating infusion port (130).
6. The exhaust gas defluorination device (10) according to claim 4, characterized in that: Also includes: A second observation window (520) is arranged on the side wall of the material collecting container (102).
7. The exhaust gas defluorination device (10) according to claim 4, characterized in that: Also includes: A defluorination slag collection pool (600) connected to the collection port (140); an alkali wash product collection tank (700) connected to the defluorination slag collection tank (600); The fluoride solution collection tank (800) is connected to the defluorination slag collection tank (600).
8. The exhaust gas defluorination device (10) according to claim 1, characterized in that: Also includes: The circulating liquid collection pool (900) is connected to the circulating liquid infusion port (130).
9. The exhaust gas defluorination device (10) according to claim 1, characterized in that: Also includes: An air duct (151) connected to the exhaust port (150); The induced draft fan (152) is arranged on the induced draft pipe (151).
10. The exhaust gas defluorination device (10) according to claim 1, characterized in that: Also includes: The demister (101) is arranged inside the tower body (100), and the demister (101) is arranged close to the top of the tower body (100).