Flushing device for tube bundle demister of pellet desulfurization system

Abstract

The utility model provides a flushing device for a tube bundle demister of a pellet desulfurization system, the tube bundle demister is arranged in a desulfurization tower and comprises a spraying assembly, the tube bundle demister is provided with two layers, and the two layers of tube bundle demisters are arranged up and down; one spraying assembly is arranged above the tube bundle demister on the upper layer, one spraying assembly is arranged below the tube bundle demister on the lower layer, and one spraying assembly is arranged between the two layers of tube bundle demisters. The rotatable spray head core is arranged in the spray head of the flushing device, and the self-cleaning effect can be achieved. High-pressure pulses are sent into the main pipe through the pulse generator, and crystallized dirt attached to the inner wall of the spray head is removed. Based on the distribution characteristics of crystalline dirt blocking the tube bundle demister, an ultrasonic generator of an auxiliary spraying assembly is designed, the flushing effect of the flushing device on the tube bundle demister of the high-pellet desulfurization system is improved, and sewage generated in the flushing process is reduced.

Description

Technical Field

[0001] This utility model relates to the field of tube bundle demister technology, and in particular to a flushing device for a tube bundle demister in a pellet desulfurization system. Background Technology

[0002] The production process of iron ore pellets generates a large amount of sulfur-containing flue gas. To reduce environmental pollution, the flue gas needs to be desulfurized. Tube bundle demisters, as key equipment in the pellet desulfurization system, are used to remove mist droplets and dust from the desulfurized flue gas, ensuring that the flue gas meets low emission requirements before being released.

[0003] During actual operation, the flue gas contains a large amount of droplets, dust, and extremely small iron powder particles generated from the pelletizing process. When the flue gas passes through the demister, the droplets and dust in the flue gas mix to form very small liquid droplets. These droplets adhere to the surface of the demister blades. After the tube bundle demister has been running for a period of time, a large amount of dust particles and liquid droplets accumulate on the surface of the tube bundle demister blades. These droplets absorb SO2 from the flue gas and form crystalline fouling composed of calcium sulfite or calcium sulfate on the blade surface. The fouling also contains extremely small iron powder particles. The fouling distribution gradually thickens from the center of the tower to the tower wall. A large amount of crystalline fouling also accumulates in the small holes and slits of the tube bundle demister. The hydraulic flushing device is insufficient to flush these areas. Long-term fouling causes blockage of the tube bundle demister, affecting desulfurization efficiency, and in severe cases, leading to deformation and collapse of the demister.

[0004] Traditional demister flushing devices struggle to flexibly adjust the pressure and flow rate of flushing water according to the demister's actual operating conditions. When there is a significant accumulation of crystalline fouling, the existing flushing intensity may be insufficient to thoroughly remove impurities; conversely, when there are fewer impurities, excessive flushing intensity wastes water resources and increases the equipment's energy consumption. Furthermore, wastewater discharge and treatment after flushing are problematic. Some flushing devices fail to effectively collect and treat wastewater, leading to direct discharge and secondary pollution of the environment. Utility Model Content

[0005] The purpose of this utility model is to provide a flushing device for tube bundle demisters in a pellet desulfurization system, so as to solve the problems of insufficient flushing effect and large amount of wastewater generated during the flushing process, which increases the load on the wastewater treatment unit. This improves the flushing effect of the tube bundle demister, extends its service life, and reduces water waste and environmental pollution.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A flushing device for a tube bundle demister in a pellet desulfurization system, wherein the tube bundle demister is installed inside the desulfurization tower and includes a spray assembly. The tube bundle demister is arranged in two layers, one above the other. A spray assembly is arranged above the upper tube bundle demister and below the lower tube bundle demister. A spray assembly is arranged between the two layers of tube bundle demisters.

[0008] Furthermore, in the flushing device of the tube bundle demister in the above-mentioned pellet desulfurization system, the spray assembly includes a main pipe, branch pipes, nozzles, and a flushing water pump. The flushing water pump is located outside the desulfurization tower. One end of the main pipe is connected to the flushing water pump, and the other end of the main pipe extends radially along the desulfurization tower to the center of the desulfurization tower. Within one spray assembly, several branch pipes are provided, one end of which is connected to the other end of the main pipe. The several branch pipes are radially distributed with the other end of the main pipe as the center. Several nozzles are evenly arranged on the branch pipes along the axial direction of the branch pipes.

[0009] Furthermore, in the flushing device of the tube bundle demister in the above-mentioned pellet desulfurization system, a nozzle core is provided inside the nozzle, and a spiral guide groove is provided on the surface of the nozzle core. When the nozzle is working, the fluid flows through the spiral guide groove and generates rotational power that can drive the nozzle core to rotate.

[0010] Furthermore, in the flushing device of the tube bundle demister in the above-mentioned pellet desulfurization system, the nozzle orifice is a conical structure, and the small end of the nozzle orifice is the outlet of the nozzle; the inner wall of the nozzle orifice is provided with an epoxy ceramic coating.

[0011] Furthermore, in the flushing device of the tube bundle demister in the above-mentioned pellet desulfurization system, the nozzle includes an upper nozzle and a lower nozzle, which are spaced apart on the branch pipe; the nozzle of the upper nozzle faces upward on the branch pipe; and the nozzle of the lower nozzle faces downward on the branch pipe.

[0012] Furthermore, in the flushing device of the tube bundle demister in the above-mentioned pellet desulfurization system, the upper end of the upper nozzle is inclined away from the center of the desulfurization tower, and the angle between the axis of the upper nozzle and the axis of the branch pipe is 45°.

[0013] Furthermore, the flushing device of the tube bundle demister in the above-mentioned pellet desulfurization system also includes a pulse generator, and one of the pulse generators is connected to one end of each of the main tubes.

[0014] Furthermore, the flushing device of the tube bundle demister in the above-mentioned pellet desulfurization system also includes an ultrasonic generator. Each layer of the tube bundle demister is provided with a ring of ultrasonic generators on the outer wall of the desulfurization tower, and each ring includes three ultrasonic generators. The three ultrasonic generators are evenly distributed along the circumference of the desulfurization tower.

[0015] Furthermore, in the flushing device of the tube bundle demister in the above-mentioned pellet desulfurization system, the flushing device is cleaned once every 24 hours, and the cleaning time is 3-5 minutes.

[0016] Furthermore, in the flushing device of the tube bundle demister in the above-mentioned pellet desulfurization system, the flushing pressure of the flushing water pump is 0.3MPa-0.5MPa.

[0017] Analysis reveals that this utility model discloses a flushing device for a tube bundle demister in a pellet desulfurization system. The flushing device features a rotatable nozzle core within its nozzle, enabling self-cleaning. A pulse generator is connected to the main pipe of the spray assembly, sending high-pressure pulses into the main pipe to remove crystalline dirt adhering to the inner wall of the nozzle. Based on the distribution characteristics of crystalline dirt clogging the tube bundle demister, an ultrasonic generator is designed to assist the spray assembly, improving the flushing effect of the flushing device on the tube bundle demister in the pellet desulfurization system and reducing wastewater generated during the flushing process. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0019] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0020] Figure 2 This is a top view schematic diagram of the ultrasonic generator arrangement according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached diagram: 1. Desulfurization tower; 2. Tube bundle demister; 3. Main pipe; 4. Branch pipe; 5. Upper nozzle; 6. Lower nozzle; 7. Flushing water pump; 8. Pulse generator; 9. Ultrasonic generator. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0023] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0024] The accompanying drawings illustrate one or more examples of the present invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the present invention. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0025] like Figures 1 to 2 As shown, according to an embodiment of this utility model, a flushing device for a tube bundle demister 2 in a pellet desulfurization system is provided. The tube bundle demister 2 is installed inside the desulfurization tower 1, as shown... Figure 1 As shown, the flushing device includes a spray assembly, and the tube bundle demister 2 is provided in two layers, with the two layers of tube bundle demister 2 arranged one above the other; a spray assembly is provided above the upper tube bundle demister 2, a spray assembly is provided below the lower tube bundle demister 2, and a spray assembly is provided between the two layers of tube bundle demister 2.

[0026] Furthermore, the spray assembly includes a main pipe 3, branch pipes 4, nozzles, and a flushing water pump 7. The flushing water pump 7 is located outside the desulfurization tower 1. One end of the main pipe 3 is connected to the flushing water pump 7, and the other end of the main pipe 3 extends radially along the desulfurization tower 1 to the center of the desulfurization tower 1. Within a spray assembly, several branch pipes 4 are provided, one end of which is connected to the other end of the main pipe 3. The branch pipes 4 are radially distributed with the other end of the main pipe 3 as the center. Several nozzles are evenly arranged along the axial direction of the branch pipes 4. The nozzles of the spray assembly are used to flush a large area of ​​the blade surface of the tube bundle demister 2, removing large areas of impurities from the blade surface of the tube bundle demister 2.

[0027] Furthermore, a nozzle core is installed inside the nozzle, and the surface of the nozzle core is provided with a spiral guide groove. When the nozzle is working, the fluid flowing through the spiral guide groove generates rotational power, which drives the nozzle core to rotate. The centrifugal force generated by the nozzle core during rotation can throw out impurities attached to the inner wall of the nozzle and around the nozzle orifice. At the same time, the rotating nozzle core can also mechanically unclog the nozzle orifice to prevent blockage.

[0028] Furthermore, the nozzle has a conical nozzle orifice with the smaller end serving as the nozzle outlet; the inner wall of the orifice is coated with an epoxy ceramic coating to reduce dirt adhesion and provide both erosion and corrosion resistance.

[0029] Furthermore, the nozzle includes an upper nozzle 5 and a lower nozzle 6, which are spaced apart on the branch pipe 4; the nozzle of the upper nozzle 5 faces upward on the branch pipe 4; and the nozzle of the lower nozzle 6 faces downward on the branch pipe 4.

[0030] Furthermore, the upper end of the upper nozzle 5 is inclined away from the center of the desulfurization tower 1, and the angle α between the axis of the upper nozzle 5 and the axis of the branch pipe 4 is 45°. This setting can improve the effect of the upper nozzle 5 in rinsing the inner wall of the desulfurization tower 1.

[0031] Furthermore, it also includes a pulse generator 8, with one pulse generator 8 connected to one end of each main pipe 3. High-pressure pulses are sent into the main pipe 3 during the working intervals of the rinsing device. The main pipe 3 transmits the pulses to each nozzle, causing the internal pressure of the nozzle to rise instantaneously. The instantaneously increased pressure can spray out the crystalline dirt adhering to the nozzle, ensuring the rinsing effect.

[0032] Furthermore, it also includes ultrasonic generators 9. A ring of ultrasonic generators 9 is installed on the outer wall of the desulfurization tower 1 corresponding to each layer of tube bundle demister 2, such as... Figure 2As shown, each ring includes three ultrasonic generators 9, which are evenly distributed around the circumference of the desulfurization tower 1. On the outer side of the tower wall corresponding to each layer of tube bundle demister 2, one ultrasonic generator 9 is installed at 120° intervals, for a total of six ultrasonic generators 9 in this flushing device. Since the fouling on the tube bundle demister 2 gradually thickens from the center of the tower towards the tower wall, a large amount of crystalline fouling also accumulates in the tube bundle orifices and slits of the tube bundle demister 2, mixed with extremely fine iron powder particles. When the spray assembly is working, ultrasonic oscillation waves are sent into the desulfurization tower 1 through the ultrasonic generators 9. Using water as a medium, the ultrasonic oscillation waves dislodge the crystalline fouling from the tube bundle orifices and slits of the tube bundle demister 2, which then flows into the bottom of the tower with the water flow. The ultrasonic generators 9 assist the spray assembly in flushing the tube bundle demister 2 of the pellet desulfurization system, improving the flushing effect of the flushing device and reducing the wastewater generated during the flushing process.

[0033] Furthermore, the rinsing device is cleaned every 24 hours, with a cleaning time of 3-5 minutes, and the rinsing pressure of the rinsing water pump 7 is 0.3MPa-0.5MPa.

[0034] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0035] A flushing device for a tube bundle demister in a pellet desulfurization system is disclosed. The device includes a rotatable nozzle core within its nozzle for self-cleaning. A pulse generator 8 is connected to the main pipe 3 of the spray assembly, sending high-pressure pulses into the main pipe 3 to remove crystalline fouling adhering to the inner wall of the nozzle. Based on the distribution characteristics of crystalline fouling clogging the tube bundle demister 2, an ultrasonic generator 9 is designed to assist the spray assembly, improving the flushing effect on the tube bundle demister 2 in the pellet desulfurization system and reducing wastewater generated during the flushing process.

[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flushing device for a tube bundle demister in a pellet desulfurization system, wherein the tube bundle demister is installed inside the desulfurization tower, characterized in that, Including spray components, The tube bundle demister is provided in two layers, with the two layers of the tube bundle demister arranged one above the other. A spray assembly is provided above the upper tube bundle demister, a spray assembly is provided below the lower tube bundle demister, and a spray assembly is provided between the two tube bundle demisters.

2. The flushing device for the tube bundle demister in the pellet desulfurization system according to claim 1, characterized in that, The spray assembly includes a main pipe, branch pipes, nozzles, and a flushing water pump. The flushing water pump is located outside the desulfurization tower. One end of the main pipe is connected to the flushing water pump, and the other end of the main pipe extends radially along the desulfurization tower to the center of the desulfurization tower. Within one of the spray assembly, several branch pipes are provided, one end of each branch pipe is connected to the other end of the main pipe, and the several branch pipes are radially distributed with the other end of the main pipe as the center. Several nozzles are evenly arranged along the axial direction of the branch pipe.

3. The flushing device for the tube bundle demister in the pellet desulfurization system according to claim 2, characterized in that, The nozzle contains a nozzle core, and the surface of the nozzle core is provided with a spiral guide groove. When the nozzle is working, the fluid flows through the spiral guide groove and generates rotational power that can drive the nozzle core to rotate.

4. The flushing device for the tube bundle demister in the pellet desulfurization system according to claim 2, characterized in that, The nozzle has a conical nozzle orifice, and the smaller end of the orifice is the nozzle outlet. The inner wall of the nozzle is coated with an epoxy ceramic coating.

5. The flushing device for the tube bundle demister in the pellet desulfurization system according to claim 2, characterized in that, The nozzle includes an upper nozzle and a lower nozzle, which are spaced apart on the branch pipe; The nozzle of the upper nozzle faces upwards from the branch pipe; The nozzle of the lower nozzle faces downwards from the branch pipe.

6. The flushing device for the tube bundle demister in the pellet desulfurization system according to claim 5, characterized in that, The upper end of the upper nozzle is inclined away from the center of the desulfurization tower, and the angle between the axis of the upper nozzle and the axis of the branch pipe is 45°.

7. The flushing device for the tube bundle demister in the pellet desulfurization system according to claim 2, characterized in that, It also includes a pulse generator, with one of the pulse generators connected to one end of each of the main tubes.

8. The flushing device for the tube bundle demister in the pellet desulfurization system according to claim 1, characterized in that, It also includes ultrasonic generators. Each layer of the tube bundle demister is provided with a ring of ultrasonic generators on the outer wall of the desulfurization tower. Each ring includes three ultrasonic generators, which are evenly distributed around the circumference of the desulfurization tower.

9. The flushing device for the tube bundle demister in the pellet desulfurization system according to claim 1, characterized in that, The rinsing device is cleaned every 24 hours, and the cleaning time is 3-5 minutes.

10. The flushing device for the tube bundle demister in the pellet desulfurization system according to claim 2, characterized in that, The flushing pressure of the flushing water pump is 0.3MPa-0.5MPa.

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