A spraying device for dry flue gas desulfurization
By designing a spray device in the dry flue gas desulfurization device, the desulfurization agent is mixed with the atomized desalinate by using the Venturi accelerator and a dual fluid spray gun to form a semi-dry state, and the injected flue and contact with the flue gas, the problem of the desulfurization efficiency not meeting the standards at low flue gas temperature is solved, and efficient desulfurization and energy saving and fee reduction are achieved.
Patent Information
- Application Number
- CN202421448622.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-04-08
- Estimated Expiration
- 2034-06-24
AI Technical Summary
When the flue gas temperature is low, the desulfurization efficiency of the existing dry flue gas desulfurization device does not meet the standards, resulting in increased energy consumption and waste of desulfurizer.
A spray device is designed to use a Venturi accelerator and a dual fluid spray gun to mix the desulfurizer with atomized desalinate to form a semi-dry state, spraying the flue into contact with the flue gas, promoting gas-liquid reaction and improving desulfurization efficiency.
It significantly improves desulfurization efficiency under low flue gas temperature conditions, reduces operating costs, and simplifies equipment transformation, with small investment.
Smart Images
Figure CN222724022U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flue gas desulfurization, in particular to an injection device for dry flue gas desulfurization. Background Art
[0002] According to the "Opinions on Promoting the Implementation of Ultra-low Emissions in the Steel Industry" jointly issued by my country's Ministry of Ecology and Environment, National Development and Reform Commission, Ministry of Industry and Information Technology, Ministry of Finance, Ministry of Transport and other five ministries in April 2019, my country has stricter emission requirements for pollutants generated by the steel industry, pointing out that the hourly average concentrations of flue gas particulate matter, sulfur dioxide and nitrogen oxide emissions shall not exceed 10, 35 and 50 mg / m3, respectively.
[0003] At present, when desulfurizing the flue gas from steel rolling heating furnaces, blast furnace hot blast furnaces, lime kilns, etc. involved in the steel industry, the dry flue gas desulfurization process is commonly used, and the desulfurizers are often sodium bicarbonate and highly active calcium hydroxide. The principle is: sodium bicarbonate powder (or highly active calcium hydroxide powder) with a particle size of about 700 mesh is sprayed into the flue through a spray gun, reacting with SO2 in the flue gas to generate Na2SO3 (or CaSO3). The purified flue gas is dedusted by a bag filter and discharged from the chimney through an induced draft fan.
[0004] At present, the problem that dry desulfurization equipment in the steel industry often encounters is low flue gas temperature. Sometimes the flue gas temperature of the heating furnace and lime kiln is only about 80°C. Dry desulfurization belongs to gas-solid reaction, and the reaction rate is lower than that of semi-dry and wet desulfurization. The low flue gas temperature causes the desulfurization efficiency to be substandard. In order to improve the desulfurization efficiency, the following methods are often used: one is to set up a supplementary heating furnace to increase the flue gas temperature to above 120°C; the other is to increase the sodium-sulfur ratio (or calcium-sulfur ratio) and spray excessive desulfurizer. Although the above two methods can improve the desulfurization efficiency, they increase the energy consumption of the desulfurization system and waste the desulfurizer. Utility Model Content
[0005] In view of the technical problems existing in the prior art, the utility model provides an injection device for dry flue gas desulfurization, which can significantly improve the desulfurization efficiency while reducing the desulfurization operation cost.
[0006] In order to achieve the above technical purpose, the technical solution adopted by the utility model is as follows:
[0007] A spray device for dry flue gas desulfurization comprises a desulfurizer pipeline connected to a flue, wherein a coaxial venturi accelerator is provided in the desulfurizer pipeline, and a coaxial dual-fluid spray gun is connected to the upstream end of the desulfurizer pipeline, the spray medium of which is atomized desalted water, and the spray end of the dual-fluid spray gun corresponds to the conical contraction of the venturi accelerator, and the desulfurizer pipeline is provided with a desulfurizer interface on the upstream side of the spray end of the dual-fluid spray gun.
[0008] Preferably, in the above-mentioned injection device for dry flue gas desulfurization, the dual-fluid spray gun includes a coaxially arranged desalted water pipeline, a compressed gas pipeline and a gas-liquid mixing pipeline, the downstream end of the desalted water pipeline is connected to the upstream end of the gas-liquid mixing pipeline, the compressed gas pipeline is nested in the periphery of the desalted water pipeline, the upstream end pipe mouth of the compressed gas pipeline is sealedly connected to the outer peripheral side pipe wall of the desalted water pipeline, the downstream end of the compressed gas pipeline is tapered and is sealedly connected to the upstream end of the gas-liquid mixing pipeline, the upstream end of the desalted water pipeline is molded with a desalted water interface, the upstream end of the compressed gas pipeline is provided with a compressed gas interface, and the downstream end of the gas-liquid mixing pipeline is provided with a nozzle.
[0009] Preferably, in the above-mentioned injection device for dry flue gas desulfurization, the downstream end of the desalted water pipeline and the upstream end of the gas-liquid mixing pipeline are connected by a conical expansion joint, and the conical expansion joint is located in the conical contraction at the downstream end of the compressed gas pipeline. The conical expansion joint is provided with a through hole for the compressed gas in the compressed gas pipeline to enter the gas-liquid mixing pipeline.
[0010] Preferably, in the above-mentioned injection device for dry flue gas desulfurization, the nozzle is detachably connected to the downstream end of the gas-liquid mixing pipeline.
[0011] Preferably, in the above-mentioned injection device for dry flue gas desulfurization, the upstream end of the desulfurizer pipeline is provided with a connecting flange for sealing the pipe end, and the upstream end of the compressed gas pipeline passes through the connecting flange and is located outside the desulfurizer pipeline.
[0012] Preferably, in the above-mentioned injection device for dry flue gas desulfurization, a fixed flange is provided at the downstream end of the desulfurizer pipeline, a flange connecting plate is provided on the flue, and the fixed flange is connected to the flange connecting plate.
[0013] Preferably, in the above-mentioned injection device for dry flue gas desulfurization, the desulfurizer medium entering the desulfurizer pipeline through the desulfurizer interface is sodium bicarbonate powder.
[0014] Preferably, in the above-mentioned injection device for dry flue gas desulfurization, the desulfurizer medium entering the desulfurizer pipeline through the desulfurizer interface is calcium hydroxide powder.
[0015] Preferably, in the above-mentioned injection device for dry flue gas desulfurization, the gas medium entering the compressed gas pipeline through the compressed gas interface is compressed air.
[0016] Preferably, in the above-mentioned injection device for dry flue gas desulfurization, the gas medium entering the compressed gas pipeline through the compressed gas interface is compressed nitrogen.
[0017] The beneficial effects of the utility model are as follows: the injection device of the utility model can make the sulfiding agent contact with the atomized desalted water, and then intensify the mixing of the liquid and the solid through the Venturi accelerator, so that the sulfiding agent is in a semi-dry state. After being sprayed into the flue and contacting the flue gas, the gas-solid reaction of the original dry desulfurization is changed into a gas-liquid reaction to a certain extent, and the reaction rate is greatly increased, which can significantly improve the desulfurization efficiency. The desulfurization efficiency can be met when the flue gas temperature is low, and the existing dry desulfurization system is convenient to transform with small investment, which can save the investment cost of dry desulfurization and reduce operating costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural diagram of the utility model;
[0019] Figure 2 It is a structural diagram of the dual-fluid spray gun described in the utility model. DETAILED DESCRIPTION
[0020] In order to further understand the present invention, the present invention is further described below with reference to the accompanying drawings and specific embodiments:
[0021] In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0022] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0023] See also Figure 1 , Figure 2 As shown in the figure, the embodiment of the utility model proposes an injection device for dry flue gas desulfurization, the injection device includes a desulfurizer pipeline 10 connected to the flue 12, wherein, as an improvement of the utility model, Figure 1 As shown, the desulfurizing agent pipeline 10 is provided with a coaxial venturi accelerator 7, and the desulfurizing agent pipeline 10 is connected to a coaxial dual-fluid spray gun at the upstream end of the venturi accelerator 7, the spray medium of which is atomized desalted water. Figure 1 As shown, the ejection end of the dual-fluid spray gun corresponds to the conical contraction of the venturi accelerator 7, and the conical expansion of the venturi accelerator 7 is integrally formed with the downstream end of the desulfurizer pipeline 10. The desulfurizer pipeline 10 is provided with a desulfurizer interface 9 at the upstream side of the ejection end of the dual-fluid spray gun, and the desulfurizer can be sprayed into the desulfurizer pipeline 10 through the desulfurizer interface 9. The desulfurizer interface 9 is arranged at the front end of the nozzle 6 to prevent the atomized desalted water from affecting the spraying of the desulfurizer powder. The desulfurizer in the desulfurizer pipeline 10 enters the Venturi accelerator 7 through the conical necking of the Venturi accelerator 7, and contacts with the atomized desalted water sprayed from the dual-fluid spray gun at the conical necking, and then is accelerated by the Venturi accelerator to intensify the mixing between the solid and liquid of the sulfiding agent and the desalted water, so that the sulfiding agent is in a semi-dry state. After being sprayed into the flue through the conical expansion of the Venturi accelerator 7 and contacting with the flue gas, the reaction rate is greatly increased, which can significantly improve the desulfurization efficiency.
[0024] Further, in a preferred embodiment of the present invention, Figure 2 As shown, the dual-fluid spray gun includes a coaxially arranged desalted water pipeline 3, a compressed gas pipeline 4 and a gas-liquid mixing pipeline 5, wherein the downstream end of the desalted water pipeline 3 is connected to the upstream end of the gas-liquid mixing pipeline 5, the compressed gas pipeline 4 is nested in the periphery of the desalted water pipeline 3, the upstream end of the compressed gas pipeline 4 is sealedly connected to the outer peripheral side wall of the desalted water pipeline 3, the downstream end of the compressed gas pipeline 4 is tapered, and is sealedly connected to the upstream end of the gas-liquid mixing pipeline 5. A desalted water interface 1 is formed outwardly at the upstream end of the desalted water pipeline 3, and desalted water can be input into the desalted water pipeline 3 through the desalted water interface 1. As shown Figure 1As shown, a compressed gas interface 2 is provided at the upstream end of the compressed gas pipeline 4, and a nozzle 6 is provided at the downstream end of the gas-liquid mixing pipeline 5, through which high-pressure gas can be input into the compressed gas pipeline 4, so that the high-pressure gas pressurizes the desalted water entering the gas-liquid mixing pipeline 5, and then sprays out through the nozzle 6 in atomized form. Specifically, according to the needs of actual working conditions, the injection amount of the desalted water can be adjusted according to the injection amount of the sulfidizing agent.
[0025] Among them, as a preferred embodiment of the utility model, the nozzle 6 is detachably connected to the downstream end of the gas-liquid mixing pipeline 5. Through the detachable connection between the two, nozzles of different specifications can be easily replaced to meet the requirements of different spray angles. As a preferred embodiment, the nozzle 6 is threadedly connected to the downstream end of the gas-liquid mixing pipeline 5 using a threaded interface. In the preferred embodiment of the utility model, the gas medium entering the compressed gas pipeline 4 through the compressed gas interface 2 can be compressed air or compressed nitrogen. The desulfurizer medium entering the desulfurizer pipeline 10 through the desulfurizer interface 9 can be sodium bicarbonate powder or calcium hydroxide powder.
[0026] Further, in a preferred embodiment of the present invention, Figure 2 As shown, the downstream end of the desalted water pipeline 3 is connected to the upstream end of the gas-liquid mixing pipeline 5 via a conical expansion port 14, which is located in the conical contraction of the downstream end of the compressed gas pipeline 4, wherein the conical expansion port 14 is provided with a through hole for the compressed gas in the compressed gas pipeline 4 to enter the gas-liquid mixing pipeline 5. Figure 1 As shown, the upstream end of the desulfurizer pipeline 10 is provided with a connection flange 8 for sealing the pipe end, and the upstream end of the compressed gas pipeline 4 passes through the connection flange 8 and is located outside the desulfurizer pipeline 10. The downstream end of the desulfurizer pipeline 10 is provided with a fixed flange 11, and the flue 12 is provided with a flange connection plate 13, and the fixed flange 11 is connected to the flange connection plate 13. The fixed flange 11 is installed on the flue, which is convenient for modification and maintenance of the existing dry desulfurization system, and the dual-fluid spray gun is fixed on the desulfurizer pipeline 10 through the connection flange 8, which is convenient for installation and maintenance.
[0027] In the dry desulfurization system in the existing technology, the sulfiding agent (sodium bicarbonate powder or calcium hydroxide powder) is directly sprayed into the flue only through the desulfurization agent pipeline, and the desulfurization agent powder is directly mixed with the flue gas for reaction. When the flue gas temperature is low, the gas-solid reaction rate is low and the desulfurization efficiency is low. In order to ensure that the sulfur dioxide gas meets the emission standards, it is necessary to install a supplementary heat furnace to increase the flue gas temperature, or increase the sodium-sulfur ratio (or calcium-sulfur ratio), and spray excessive desulfurizer. Although the above two methods can improve the desulfurization efficiency, they will increase the energy consumption of the desulfurization system and waste the desulfurizer. The injection device of the utility model can convert the gas-solid reaction of the original dry desulfurization into a gas-liquid reaction to a certain extent, and the reaction rate is greatly improved. The desulfurization efficiency can be met when the flue gas temperature is low, thereby saving the investment cost of dry desulfurization and reducing operating costs. In addition, the injection device of the utility model only needs to modify the sodium bicarbonate powder (or calcium hydroxide powder) spray gun on the basis of the original dry desulfurization system, and other equipment of the original dry desulfurization system can continue to be used. The equipment modification is simple, the investment is small, and the time consumption is short.
[0028] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and the specification only describe the principle of the utility model. The utility model may have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements fall within the scope of the utility model to be protected, and the scope of protection required by the utility model is defined by the attached claims and their equivalents.
Claims
1. An injection device for dry flue gas desulfurization, comprising a desulfurizer pipeline (10) connected to a flue (12), characterized in that: The desulfurizing agent pipeline (10) is provided with a coaxial Venturi accelerator (7) therein; the desulfurizing agent pipeline (10) is connected to a coaxial dual-fluid spray gun at the upstream end of the Venturi accelerator (7) and the spray medium is atomized desalted water; the spray end of the dual-fluid spray gun corresponds to the conical contraction of the Venturi accelerator (7); the desulfurizing agent pipeline (10) is provided with a desulfurizing agent interface (9) at the upstream side of the spray end of the dual-fluid spray gun.
2. The injection device for dry flue gas desulfurization according to claim 1, characterized in that: The dual-fluid spray gun comprises a coaxially arranged desalted water pipeline (3), a compressed gas pipeline (4) and a gas-liquid mixing pipeline (5); the downstream end of the desalted water pipeline (3) is connected to the upstream end of the gas-liquid mixing pipeline (5); the compressed gas pipeline (4) is nested in the periphery of the desalted water pipeline (3); the upstream end of the compressed gas pipeline (4) is sealed to the outer peripheral side wall of the desalted water pipeline (3); the downstream end of the compressed gas pipeline (4) is tapered and sealed to the upstream end of the gas-liquid mixing pipeline (5); the upstream end of the desalted water pipeline (3) is formed with a desalted water interface (1); the upstream end of the compressed gas pipeline (4) is provided with a compressed gas interface (2); and the downstream end of the gas-liquid mixing pipeline (5) is provided with a nozzle (6).
3. The injection device for dry flue gas desulfurization according to claim 2, characterized in that: The downstream end of the desalted water pipeline (3) is connected to the upstream end of the gas-liquid mixing pipeline (5) via a conical expansion opening (14), the conical expansion opening (14) being located within the conical contraction at the downstream end of the compressed gas pipeline (4), and the conical expansion opening (14) is provided with a through hole for the compressed gas in the compressed gas pipeline (4) to enter the gas-liquid mixing pipeline (5).
4. The injection device for dry flue gas desulfurization according to claim 2, characterized in that: The nozzle (6) is detachably connected to the downstream end of the gas-liquid mixing pipeline (5).
5. The injection device for dry flue gas desulfurization according to claim 2, characterized in that: The upstream end of the desulfurizing agent pipeline (10) is provided with a connecting flange (8) for sealing the pipe end, and the upstream end of the compressed gas pipeline (4) passes through the connecting flange (8) and is located outside the desulfurizing agent pipeline (10).
6. The injection device for dry flue gas desulfurization according to claim 1, characterized in that: A fixed flange (11) is provided at the downstream end of the desulfurizing agent pipeline (10), a flange connecting plate (13) is provided on the flue (12), and the fixed flange (11) is connected to the flange connecting plate (13).
7. The injection device for dry flue gas desulfurization according to claim 1, characterized in that: The desulfurizing agent medium entering the desulfurizing agent pipeline (10) through the desulfurizing agent interface (9) is sodium bicarbonate powder.
8. The injection device for dry flue gas desulfurization according to claim 1, characterized in that: The desulfurizing agent medium entering the desulfurizing agent pipeline (10) through the desulfurizing agent interface (9) is calcium hydroxide powder.
9. The injection device for dry flue gas desulfurization according to claim 2, characterized in that: The gas medium entering the compressed gas pipeline (4) through the compressed gas interface (2) is compressed air.
10. The injection device for dry flue gas desulfurization according to claim 2, characterized in that: The gas medium entering the compressed gas pipeline (4) through the compressed gas interface (2) is compressed nitrogen.