Flue gas desulfurization tail gas purification device

Abstract

The flue gas desulfurization tail gas purification device comprises a smoke exhaust tower and an electromagnetic white gas removal device, a smoke exhaust pipeline is arranged in the smoke exhaust tower and is divided into a gas inlet pipeline and a gas outlet pipeline by a blind plate, the lower end section of the gas inlet pipeline is connected with a tail gas pipeline, and the upper end section of the gas inlet pipeline is connected with the gas inlet end of the electromagnetic white gas removal device through a flue gas pipeline; the electromagnetic white smoke removal device is of a bottom-in and top-out structure, the electromagnetic white smoke removal device is sequentially provided with a settling layer, a cooling layer and a demisting layer from bottom to top, an electromagnetic emission system connected with the electromagnetic generation device is arranged in the demisting layer, a spraying system is further arranged in the electromagnetic white smoke removal device, and the gas outlet end of the electromagnetic white smoke removal device is connected with a gas outlet pipeline through a flue gas pipeline. The device effectively reduces the total discharge amount of main pollutants in the desulfurized tail gas and reduces the phenomenon of tail gas white smoke trailing, so that the main environment-friendly discharge index of tail gas desulfurization reaches the national special discharge limit value, the safe and environment-friendly operation of a fuming furnace and a reduction furnace is realized, the good environment-friendly image of a company is maintained, and the environment-friendly benefit of the company is realized.

Description

Technical Field

[0001] The present application relates to the technical field of flue gas desulfurization towers, and in particular to a flue gas desulfurization tail gas purification device. Background Art

[0002] The low-concentration SO2 flue gas produced by the fuming furnace and the reduction furnace is currently treated with an ammonia desulfurization process. After testing the tail gas desulfurization emission indicators, it was found that the SO2 and nitrogen oxide contents can meet the special emission standards, but the average content of particulate matter does not meet the special emission standards. As a result, during the actual operation of the ammonia desulfurization process, especially when the temperature is below 15°C, there is a phenomenon of tail exhaust white smoke trailing for several kilometers that is difficult to dissipate, which seriously affects the company's environmental image. It is necessary to deeply purify the tail gas after desulfurization to ensure that the tail emission indicators meet the special emission limits and eliminate the tail exhaust white smoke trailing from the root. Utility Model Content

[0003] In order to solve or partially solve the problems existing in the related technology, the present application provides an electromagnetic desulfurization treatment device, which makes the mixed pollutants in the flue gas form large droplets and discharge from the bottom of the electromagnetic desulfurization device, and the clean gas leaves from the upper part of the electromagnetic desulfurization equipment.

[0004] The first aspect of the present application provides a flue gas desulfurization tail gas purification device, including: a smoke exhaust tower and an electromagnetic de-whitening device, a smoke exhaust pipe is arranged in the smoke exhaust tower, a blind plate is arranged in the middle of the smoke exhaust pipe, and the blind plate divides the smoke exhaust pipe into an air inlet pipe and an air outlet pipe, the lower end section of the air inlet pipe is connected to the tail gas pipe, and the upper end section is connected to the air inlet end of the electromagnetic de-whitening device through the smoke pipe, the electromagnetic de-whitening device is a bottom-in and top-out structure, the electromagnetic de-whitening device is provided with multiple layers, and a sedimentation layer, a cooling layer and a demisting layer are sequentially arranged from bottom to top, an electromagnetic emission system connected to an electromagnetic generating device is arranged in the demisting layer, a spray system is also arranged in the electromagnetic de-whitening device, and the air outlet end of the electromagnetic de-whitening device is connected to the air outlet pipe through the smoke pipe.

[0005] Optionally, in some embodiments of the first aspect,

[0006] A staircase is installed on one side of the electromagnetic de-whitening device, and a multi-layer platform is arranged on the staircase corresponding to the electromagnetic de-whitening device.

[0007] Optionally, in some embodiments of the first aspect,

[0008] A guide plate is provided at the smoke inlet at the air inlet end of the electromagnetic desulfurization device.

[0009] Optionally, in some embodiments of the first aspect,

[0010] The spray system includes at least two flushing devices, which include nozzles, spray pipes and electric valves. The spray pipes are connected to the circulation pump, and the spray system is connected to the circulation pool through the circulation pump and the circulation pump pipeline.

[0011] Optionally, in some embodiments of the first aspect,

[0012] The flushing device is installed corresponding to the demisting layer, the cooling layer and the sedimentation layer.

[0013] Optionally, in some embodiments of the first aspect,

[0014] The sedimentation layer uses regular plastic filler and is pressed tightly with grids at the top and bottom.

[0015] The technical solution provided by this application may have the following beneficial effects:

[0016] The present application provides a flue gas desulfurization tail gas purification device, which effectively reduces the total amount of main pollutants discharged in the desulfurization tail gas and alleviates the phenomenon of white smoke tailing in the tail gas, so that the main environmental emission indicators of the tail gas desulfurization reach the national special emission limit, realizes the safe and environmentally friendly operation of the fuming furnace and the reduction furnace, maintains the company's good environmental image and realizes the company's environmental benefits.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0019] Figure 1 It is a schematic diagram of the structure of the device shown in the embodiment of the present application;

[0020] Figure 2 It is a process schematic diagram of the device shown in the embodiment of the present application;

[0021] Reference numerals:

[0022] 1-circulating pump, 2-circulating pump pipeline, 3-smoke pipeline, 4-smoke exhaust pipeline, 5-blind plate, 6-sedimentation layer, 7-cooling layer, 8-stairs, 9-main frame, 10-electromagnetic launching system, 11-electromagnetic generating device, 12-spraying system, 13-smoke exhaust tower, 14-electromagnetic de-whitening device, 15-circulating pool. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0024] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0027] The technical solution of the embodiments of the present application is described in detail below with reference to the accompanying drawings.

[0028] The flue gas desulfurization tail gas purification device shown in the figure includes: a smoke exhaust tower 13 and an electromagnetic desulfurization device 14. A smoke exhaust pipe 4 is arranged in the smoke exhaust tower 13, and a blind plate 5 is arranged in the middle of the smoke exhaust pipe 4. The blind plate 5 divides the smoke exhaust pipe 4 into two unconnected branch pipes, the bottom is an air intake pipe, and the upper part is an air outlet pipe. The lower end section of the air intake pipe is connected to the tail gas pipe, and the upper end section is connected to the air intake end of the electromagnetic desulfurization device 14 through the flue gas pipe 3. The desulfurized tail gas enters the smoke exhaust tower 13 through the tail gas pipe and the air intake pipe, and enters the electromagnetic desulfurization device 14 through the flue gas pipe 3 under the partition of the blind plate 5.

[0029] The electromagnetic de-whitening device 14 is a bottom-in and top-out structure, including a main frame 9, a smoke distribution device and multiple functional layers. The main frame 9 adopts a steel structure support form, which needs to fully consider the site location and the overhead and lower bracket layout and form of the de-whitening device to meet the requirements of the body load and operating load of the de-whitening device. Necessary shells, platforms, passages and stairs 8, as well as internal maintenance platforms are set up so that the operation, maintenance and maintenance of the de-whitening device can proceed smoothly. All platforms are equipped with railings and guard plates, the height of the railing is 1.2m, the height of the skirting board is not less than 100mm, the width of the platform is not less than 700mm, the platform load is not less than 4kN / m2, and corresponding obvious and standardized load and elevation signs are set. The escalator can meet the working surface that needs to be inspected and operated on each floor, and the escalator load is 2kN / m2. The net width of the walkway and stairs 8 is not less than 700mm, and the angle of the escalator is not more than 50°. All platforms are equipped with corresponding obvious and standardized load and elevation signs.

[0030] The flue gas distribution device is a guide plate set at the air inlet end of the electromagnetic desulfurization device 14. Since the uniformity of airflow distribution is directly related to the purification efficiency, the flue gas pollutants are complex, including particulate matter such as PM2.5 and PM10, as well as aerosols, ammonia desulfurization slurry droplets, etc., in order to ensure high purification efficiency, the uniformity of airflow distribution is required, and the guide plate at the flue gas inlet is set according to the flow field simulation.

[0031] The electromagnetic desulfurization device 14 is provided with a sedimentation layer 6, a cooling layer 7 and a demisting layer from bottom to top. The materials of the electromagnetic desulfurization device 14 in contact with the flue gas are guaranteed to be able to withstand the corrosion and abrasion of the strongly acidic wet flue gas. At the same time, in order to solve the problem of aerosol after ammonia desulfurization, a circulating spray system 12 is provided in the electromagnetic desulfurization device 14. The spray system 12 includes multiple sets of flushing devices installed corresponding to the demisting layer, the cooling layer 7 and the sedimentation layer 6, forming multiple spray layers. The flushing device includes a nozzle, a spray pipe, and an electric valve.

[0032] The sedimentation layer 6 is made of regular plastic packing, which is pressed tightly with grids at the top and bottom. Two spray layers are designed on the upper part of the sedimentation layer 6. The liquid-gas ratio of the spray layer is 2.5L / Nm3. The flow rate of each spray layer is 250m3 / h, corresponding to two water washing circulation pumps 1. The circulation pump 1 is connected to the circulation pool 15 through the circulation pump pipeline 2. The spray layer is made of glass fiber reinforced plastic, and the nozzle is a SiC volute atomizing nozzle. The flue gas flow rate in this area is designed to be 3.5m / s, and the crystals such as aerosol, ammonium sulfate, and ammonium sulfite in the flue gas are fully contacted and absorbed by the spray water.

[0033] The cooling layer 7 is used to reduce the temperature of the smoke, and after the temperature is reduced, the white smoke enters the demisting layer.

[0034] An electromagnetic emission system 10 connected to an electromagnetic generator 11 is provided in the demisting layer. The working principle of the electromagnetic de-whitening technology is as follows: the electromagnetic generator 11 generates continuous transient electromagnetic energy; when low-temperature and humid flue gas enters the electromagnetic field, the electromagnetic energy magnetizes various mixed pollutants in the flue gas, and increases and enhances the physical properties of the water mist, such as the diffusion coefficient, surface expansion force, and viscosity; the mixed pollutants continuously collide and condense in the process of flowing in the electromagnetic field area, forming large droplets, overcoming the buoyancy of the flue gas, and finally relying on their own gravity to be discharged from the bottom of the electromagnetic de-whitening device 14, and the clean gas is discharged from the upper part of the electromagnetic de-whitening equipment in compliance with the standards. The electromagnetic de-whitening technology and equipment have a comprehensive small droplet capture rate of more than 97%. Through the effective capture of particulate matter and water mist in the exhaust gas, the particulate matter content of the exhaust gas is finally reduced to ≤10mg / Nm3, improving the appearance of exhaust emissions and ensuring that the exhaust indicators meet the special emission limits.

[0035] The demisting layer is designed with two spray layers, the upper and lower layers. The harmful substances in the flue gas in the electromagnetic de-whitening device 14 are effectively purified by electromagnetic energy, becoming clean gas, which passes through the flue gas duct 3 and enters the exhaust duct, and is finally discharged from the top of the smoke exhaust tower 13. Dust particles, acid mist, aerosols, slurry droplets, etc. are captured, and the liquid film formed on the inner wall of the electromagnetic tube flows downward and is finally discharged from the bottom flue. Due to the strong viscosity of the mixed pollutants, temporary flushing is required regularly; the flushing time is about 10 minutes, and it is flushed once every 1 to 3 days, and the water consumption each time is about 25m 3 .

[0036] The spray system 12 is an external circulation tower, and a circulation pool 15 with a volume of 60m3 is set, and a liquid level meter and a wastewater discharge pump are set. When the wastewater density reaches 1.10, it is discharged into the secondary circulation tower of the existing ammonia desulfurization system process for recycling and then produced as ammonium sulfate fertilizer for sale. The external circulation liquid pool of the water washing tower can use the existing idle glass fiber reinforced plastic tank. The circulation pump 1 of the water washing tower circulation system has a calculated flow rate of 250m3 / h and a head of 20m.

[0037] Finally, it should be noted that, in this article, relationships such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms include, include or any other variations are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0039] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A flue gas desulfurization tail gas purification device, characterized in that: include: A smoke exhaust tower and an electromagnetic de-whitening device, wherein a smoke exhaust pipe is arranged in the smoke exhaust tower, a blind plate is arranged in the middle of the smoke exhaust pipe and the blind plate separates the smoke exhaust pipe into an air inlet pipe and an air outlet pipe, the lower end section of the air inlet pipe is connected to the tail gas pipe, and the upper end section is connected to the air inlet end of the electromagnetic de-whitening device through a smoke pipe, the electromagnetic de-whitening device is a bottom-in and top-out structure, the electromagnetic de-whitening device is provided with multiple layers, a sedimentation layer, a cooling layer and a demisting layer are arranged in sequence from bottom to top, an electromagnetic emission system connected to an electromagnetic generating device is arranged in the demisting layer, a spray system is also arranged in the electromagnetic de-whitening device, and the air outlet end of the electromagnetic de-whitening device is connected to the air outlet pipe through a smoke pipe.

2. The flue gas desulfurization tail gas purification device according to claim 1, characterized in that: A staircase is installed on one side of the electromagnetic de-whitening device, and the staircase is provided with multi-layer platforms corresponding to the electromagnetic de-whitening device.

3. The flue gas desulfurization tail gas purification device according to claim 1, characterized in that: A guide plate is provided at the smoke inlet at the air inlet end of the electromagnetic desulfurization device.

4. The flue gas desulfurization tail gas purification device according to claim 1, characterized in that: The spray system comprises at least two flushing devices, each of which comprises a nozzle, a spray pipe and an electric valve. The spray pipe is connected to a circulation pump, and the spray system is connected to a circulation pool through a circulation pump and a circulation pump pipeline.

5. The flue gas desulfurization tail gas purification device according to claim 4, characterized in that: The flushing device is installed corresponding to the demisting layer, the cooling layer and the sedimentation layer.

6. The flue gas desulfurization tail gas purification device according to claim 1, characterized in that: The sedimentation layer is filled with regular plastic fillers and is compressed by grids at the top and bottom.

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