Fan device for denitration dilution of boiler

Abstract

The utility model discloses a fan device for boiler denitration dilution, which relates to the technical field of chemical fans and comprises a boiler pipe and a fan body, the boiler pipe is fixedly connected with a smoke outlet of a boiler, one end of the boiler pipe is sleeved with an air inlet pipe, and one end of the air inlet pipe is fixedly connected with a protective cover. The protective cover is fixedly connected with the fan body through a plurality of sets of bolts, the motor is fixedly installed on the other side of the fan body, the exhaust pipe is fixedly installed on the outer side of the fan body, the rotating blades are movably installed on the inner side of the fan body, and the rotating blades are fixedly connected with the output end of the motor. And the filter assembly is arranged in the air inlet pipe, and dust in the discharged smoke of the boiler can be effectively intercepted through the filter screen with negative charges. The filter screen is connected with the sealing sheet through the annular metal elastic sheet and can shake under the impact of airflow to promote the attached dust to fall off; and the filter screen can be externally connected with voltage to form corona discharge, so that the dust adsorption effect is enhanced, and the gas filtering efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to chemical industry fan technical field, concretely is a kind of fan device for boiler denitration dilution. BACKGROUND

[0002] In modern industrial production and energy supply system, boiler as key equipment is widely used in electric power, chemical industry, steel and many other fields. With increasingly stringent environmental standards and the continuous pursuit of energy efficient use, the tail gas emission problem in the process of boiler operation becomes the focus of attention.

[0003] In the combustion process of traditional boiler, fuel and air mixed combustion can produce a large amount of high-temperature flue gas containing nitrogen oxides (NOx) and other pollutants. Nitrogen oxides emitted into the atmosphere can cause acid rain, photochemical smog and other serious environmental problems, which pose a great threat to the ecological system and human health. In order to reduce the emission of nitrogen oxides, denitration technology has become a key link in the treatment of boiler tail gas. Among many denitration processes, selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) technologies are widely used, and these technologies need to mix the denitration agent with the flue gas sufficiently to improve the denitration efficiency.

[0004] As an important equipment for conveying and mixing gas, the performance of fan directly affects the denitration effect. In the process of boiler operation, the gas discharged from the smoke outlet contains a large amount of dust and other impurities. In the process of smoke exhaust, the existing fan lacks a device for treating smoke and adjusting the flow direction of gas, so that the impurities in the airflow and smoke cannot be intercepted and treated, which affects the subsequent treatment of the equipment. SUMMARY

[0005] The utility model provides a kind of fan device for boiler denitration dilution, with the advantages of improving gas filtration efficiency, optimizing the flow path of gas in the device, and improving the conveying efficiency, to solve the problem of single function and poor filtering effect of traditional fan.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: a kind of fan device for boiler denitration dilution, including boiler pipe and fan body, the smoke outlet of boiler is fixedly connected with the boiler pipe, the one end of the boiler pipe is sleeved with air inlet pipe, the one end of the air inlet pipe is fixedly connected with protective cover, the protective cover is fixedly connected with fan body by multiple bolts, the other side of the fan body is fixedly installed with motor, the outside of the fan body is fixedly installed with exhaust pipe, the inside of the fan body is movably installed with rotating blade, the rotating blade is fixedly connected with the output end of motor, the air inlet pipe is provided with filter assembly at filter assembly connection, the inside of the air inlet pipe is provided with flow guide assembly, wherein flow guide assembly is located in front of filter assembly, and the air inlet pipe is communicated with fan body.

[0007] As a preferred technical scheme of the utility model, the outside of the air inlet pipe is symmetrically provided with annular sockets, and the filter assembly is inserted into the inner wall of the air inlet pipe through the annular sockets;

[0008] The annular sockets symmetrically provided on the outside of the air inlet pipe facilitate the installation and disassembly of the filter assembly, and the operation is simple and fast when the filter screen needs to be replaced, thereby reducing the maintenance difficulty and time cost.

[0009] The clamping seat and the clamping hole provided on the outside of the protective cover are convenient for being fixedly connected with the fan body through bolts and are also convenient for being disassembled during maintenance, thereby improving the maintainability of the equipment.

[0010] As a preferred technical scheme of the utility model, the outside of the protective cover is symmetrically provided with clamping seats about the center of the protective cover, and the side edges of the clamping seats are provided with clamping holes, wherein the clamping holes are symmetrically arranged.

[0011] As a preferred technical scheme of the utility model, the filter assembly comprises a sealing piece and a filter screen, the filter screen is fixedly installed on the side edge of the sealing piece, and the sealing piece and the filter screen are connected through annular metal elastic sheets, wherein the filter screen is negatively charged.

[0012] The filter screen with negative charge is adopted to filter air by using the principle of electrostatic adsorption, and compared with the traditional physical filtering mode, the filter screen can more efficiently remove small positive impurities in the gas and improve the filtering precision.

[0013] The design that the sealing piece and the filter screen are connected through the annular metal elastic sheets enables the filter assembly to vibrate the adhered impurities to make them fall off during installation and adaptation to airflow fluctuation.

[0014] As a preferred technical scheme of the utility model, the flow guide assembly comprises a smoke guide pipe, a conical air inlet and a flow dividing piece, the conical air inlet is provided through the smoke guide pipe, the smoke guide pipe is fixedly installed on the inner wall of the air inlet pipe, and the flow dividing piece is movably installed on one end of the smoke guide pipe, wherein the flow dividing piece is arranged towards the filter assembly.

[0015] As a preferred technical scheme of the utility model, the number of the flow dividing pieces is several groups and is circumferentially equidistantly distributed, wherein the flow dividing pieces are arranged in a trapezoidal shape, the flow dividing pieces are movably connected with the end face of the smoke guide pipe, and the initial state of the flow dividing pieces is in a gathered state, wherein the flow dividing pieces are made of metal material;

[0016] The flow dividing piece is movably installed on one end of the smoke guide pipe and is in the initial state of the gathered state. When the high-speed airflow impacts the flow dividing piece, the flow dividing piece will be opened. Since the number of the flow dividing pieces is several groups and is circumferentially equidistantly distributed and arranged in a trapezoidal shape, the opened flow dividing pieces will uniformly disperse the airflow to all directions of the smoke guide pipe, so that the airflow is more uniformly distributed in the smoke guide pipe, thereby improving the stability of the gas conveying.

[0017] As a preferred technical scheme of the utility model, the flow guide assembly further comprises a spiral piece, the spiral piece is fixedly installed on the inner wall of the conical air inlet, and the spiral piece is provided with a variable diameter, and the radius of the end close to the filter assembly is relatively large.

[0018] As a preferred technical scheme of the utility model, the conical air inlet is provided with a taper, and the diameter of the end close to the filter assembly is the smallest, wherein the inner wall of the conical air inlet and the flow divider are coated with ceramic paint.

[0019] Compared with the prior art, the utility model provides a boiler denitration dilution fan device with the following beneficial effects:

[0020] Efficient filtration: the filter assembly arranged in the air inlet pipe can effectively intercept dust in the boiler flue gas through the filter screen with negative charge. The filter screen and the sealing piece are connected through the annular metal spring piece, can be shaken under the impact of airflow, and promote the dust to fall off; and the filter screen can be connected with voltage to form corona discharge, enhance the dust adsorption effect, and greatly improve the gas filtration efficiency.

[0021] Optimized flow guide: the flow guide assembly can guide and divide the gas in the air inlet pipe. The gas is discharged in a spiral shape under the action of the spiral piece through the conical air inlet, and the gas is scattered by the impact of the flow divider, so that the gas passes through the filter screen more uniformly, not only improves the filtration effect, but also optimizes the flow path of the gas in the device and improves the conveying efficiency.

[0022] Stable structure and convenient maintenance: the protective cover and the fan body are fixed through bolts, which is convenient for installation and disassembly, and facilitates maintenance of the internal components. The sealing piece and the clamping seat of the filter assembly are clamped, so that the filter screen is installed and replaced conveniently, and the convenience of device maintenance is improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic view of the boiler denitration dilution fan device of the utility model;

[0024] Figure 2 It is an explosion schematic view of the fan device structure in the utility model;

[0025] Figure 3 It is a partial structure schematic view in the utility model Figure 1 ;

[0026] Figure 4 It is a partial structure schematic view in the utility model Figure 2 ;

[0027] Figure 5 It is an enlarged schematic view of the A structure in the utility model Figure 3 ;

[0028] Figure 6The utility model discloses a smoke guide pipe and its half profile schematic diagram.

[0029] In the drawing: 1, boiler pipe; 2, air inlet pipe; 3, exhaust pipe; 4, fan body; 5, motor; 6, protective cover; 7, clamping seat; 8, sealing piece; 9, rotating blade; 10, filter screen; 11, smoke guide pipe; 12, conical air inlet; 13, shunt piece; 14, spiral piece. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be apparently and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative work belong to the range of protection of the utility model.

[0031] Please refer to Figures 1-6 The utility model discloses a kind of boiler denitration dilution fan device, including boiler pipe 1 and fan body 4, boiler pipe 1 is fixedly connected with the smoke outlet of boiler, and one end of boiler pipe 1 is sleeved with air inlet pipe 2;

[0032] The outer side of air inlet pipe 2 is symmetrically provided with annular socket, and the filter assembly is inserted into the inner wall of air inlet pipe 2 through the annular socket One end of air inlet pipe 2 is fixedly connected with protective cover 6;

[0033] The outer side of protective cover 6 is symmetrically provided with clamping seat 7 about the center of protective cover 6, and the side of clamping seat 7 is provided with bayonet, wherein the bayonet is symmetrically arranged;

[0034] The side of clamping seat 7 is provided with bayonet, so as to realize the clamping of sealing piece 8, wherein the filter screen 10 is semicircular, is inserted from the annular socket symmetrically arranged on the outer side of air inlet pipe 2, and then the sealing piece 8 is clamped with the bayonet arranged on the side of clamping seat 7, wherein the sealing piece 8 is symmetrically arranged in two groups on the outer side of air inlet pipe 2, and the two groups of sealing piece 8 are inserted to block the inside of air inlet pipe 2 to form a complete filter assembly.

[0035] Protective cover 6 and fan body 4 are fixedly connected through a plurality of bolts, motor 5 is fixedly installed on the other side of fan body 4, exhaust pipe 3 is fixedly installed on the outer side of fan body 4, rotating blade 9 is movably installed on the inner side of fan body 4, rotating blade 9 is fixedly connected with the output end of motor 5, filter assembly is arranged at the connection between air inlet pipe 2 and protective cover 6, flow guide assembly is arranged in the inside of air inlet pipe 2, wherein the flow guide assembly is located in front of filter assembly, and air inlet pipe 2 is communicated with fan body 4.

[0036] The exhaust port of the boiler is fixedly connected with the boiler pipe 1, the gas generated by the boiler enters into the fan body 4 through the boiler pipe 1 and the air inlet pipe 2, the rotating blades 9 arranged in the fan body 4 rotate at high speed under the driving of the motor 5, the blades on the rotating blades 9 can drive the gas to rotate together, so that the gas obtains centrifugal force, the gas is thrown to the outer edge of the impeller under the action of the centrifugal force and flows along the radial direction, so that the speed and pressure of the gas are increased, the gas at the outer edge of the rotating blades 9 enters the volute, the shape of the volute is gradually expanded, so that the flow rate of the gas is reduced and the pressure is further increased, and finally the gas is discharged from the air outlet pipe 3 after being treated by the flow guide assembly and the filter assembly during the conveying process.

[0037] Specifically, the filter assembly comprises a sealing piece 8 and a filter screen 10, the filter screen 10 is fixedly installed on the side of the sealing piece 8, the sealing piece 8 is connected with the filter screen 10 through the annular metal elastic sheet, and the filter screen 10 is negatively charged.

[0038] In the embodiment, the filter assembly is arranged in the air inlet pipe 2 to filter the gas discharged from the exhaust port of the boiler, so as to intercept and filter the dust in the gas, the sealing piece 8 is connected with the filter screen 10 through the annular metal elastic sheet, so that the filter screen 10 can shake under the impact of the airflow and the dust adhered to the filter screen 10 can fall off, and the filter screen 10 can be connected with an external voltage, and one or more needle-shaped metal electrodes and a relatively large flat plate electrode or annular electrode can be arranged on the filter screen 10, when a high-voltage direct-current voltage is applied between the needle-shaped electrode and the flat plate electrode, the electric field strength at the tip of the needle-shaped electrode is extremely high. Under the action of the strong electric field, the air around the tip of the needle-shaped electrode is rapidly ionized to form corona discharge. The electrons and ions generated by ionization move under the action of the electric field to form a corona current, wherein the electrons move towards the flat plate electrode and the positive ions diffuse to the area near the needle-shaped electrode, so that the dust is adsorbed.

[0039] Specifically, the flow guide assembly comprises a smoke guide pipe 11, a conical air inlet 12 and a flow distribution piece 13, the conical air inlet 12 is arranged through the smoke guide pipe 11, the smoke guide pipe 11 is fixedly installed on the inner wall of the air inlet pipe 2, and the flow distribution piece 13 is movably installed at one end of the smoke guide pipe 11, wherein the flow distribution piece 13 is arranged towards the filter assembly, the conical air inlet 12 is conical, and the diameter of the end close to the filter assembly is the smallest, and the inner wall of the conical air inlet 12 and the flow distribution piece 13 are coated with ceramic paint.

[0040] The ceramic paint has high hardness and smoothness, and the dense coating structure can effectively prevent the invasion and adhesion of pollutants such as soot. At the same time, the ceramic paint also has good high-temperature resistance and is not easy to adsorb soot due to high temperature.

[0041] The number of the shunt pieces 13 is several groups of equidistantly distributed in a circle, wherein the shunt pieces 13 are arranged in a trapezoidal shape, the shunt pieces 13 are movably connected with the end face of the smoke guide pipe 11, and the initial state is in a gathering state, wherein the shunt pieces 13 are made of metal material; the flow guide assembly further comprises a spiral piece 14, the spiral piece 14 is fixedly installed on the inner wall of the conical air inlet 12, the spiral piece 14 is arranged in a variable diameter manner, and the radius of the end close to the filter assembly is larger.

[0042] In the embodiment, the flow guide assembly is arranged to guide the gas flowing through the air inlet pipe 2, when the gas is conveyed along the air inlet pipe 2 under the extraction of the fan body 4, the gas enters through the wide end of the conical air inlet 12 and is discharged from the narrow end, under the action of the spiral piece 14, the gas is discharged from the narrow end of the smoke guide pipe 11 in a spiral shape, and the gas blows the shunt pieces 13 when being discharged, so that the gas is dispersed under the action of the shunt pieces 13 and is filtered through the filter screen 10.

[0043] It should be noted that in this document, such as the term "comprising", "including" or any other variant thereof, is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or equipment including the element.

[0044] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A boiler denitration dilution fan device, comprising a boiler pipe (1) and a fan body (4), the boiler pipe (1) is fixedly connected with the exhaust port of the boiler, characterized in that: One end of the boiler pipe (1) is sleeved with an air inlet pipe (2), one end of the air inlet pipe (2) is fixedly connected with a protective cover (6), the protective cover (6) and the fan body (4) are fixedly connected through a plurality of bolts, the other side of the fan body (4) is fixedly installed with a motor (5), the outer side of the fan body (4) is fixedly installed with an exhaust pipe (3), the inner side of the fan body (4) is movably installed with a rotating blade (9), the rotating blade (9) is fixedly connected with the output end of the motor (5), the air inlet pipe (2) is provided with a filtering assembly at the connecting part of the air inlet pipe (2) and the protective cover (6), the inner side of the air inlet pipe (2) is provided with a flow guide assembly, wherein the flow guide assembly is located in front of the filtering assembly, and the air inlet pipe (2) is in communication with the fan body (4).

2. The boiler denitration dilution fan device according to claim 1, characterized in that: The outer side of the air inlet pipe (2) is symmetrically provided with an annular socket, and the filtering assembly is inserted into the inner wall of the air inlet pipe (2) through the annular socket.

3. The boiler denitration dilution fan device according to claim 1, characterized in that: The outer side of the protective cover (6) is symmetrically provided with a clamping seat (7) about the center of the protective cover (6), and a bayonet is formed in the side edge of the clamping seat (7), wherein the bayonet is symmetrically arranged.

4. The boiler denitration dilution fan device according to claim 1, characterized in that: The filtering assembly comprises a sealing sheet (8) and a filter screen (10), the filter screen (10) is fixedly installed on the side edge of the sealing sheet (8), the sealing sheet (8) and the filter screen (10) are connected through an annular metal elastic sheet, and the filter screen (10) is negatively charged.

5. The boiler denitration dilution fan device according to claim 1, characterized in that: The flow guide assembly comprises a smoke guide pipe (11), a conical air inlet (12) and a flow dividing sheet (13), the conical air inlet (12) is formed through the smoke guide pipe (11), the smoke guide pipe (11) is fixedly installed on the inner wall of the air inlet pipe (2), and the flow dividing sheet (13) is movably installed on one end of the smoke guide pipe (11), wherein the flow dividing sheet (13) is arranged towards the filtering assembly.

6. The boiler denitration dilution fan device according to claim 5, characterized in that: The number of the flow dividing sheets (13) is several groups which are distributed at equal intervals in a circle, wherein the flow dividing sheets (13) are arranged in a trapezoidal shape, the flow dividing sheets (13) are movably connected with the end face of the smoke guide pipe (11), and the initial state of the flow dividing sheets (13) is in a gathering state, wherein the flow dividing sheets (13) are made of metal material.

7. The boiler denitration dilution fan device according to claim 5, characterized in that: The flow guide assembly further comprises a spiral sheet (14), the spiral sheet (14) is fixedly installed on the inner wall of the conical air inlet (12), and the spiral sheet (14) is arranged in a variable diameter manner, and the end close to the filtering assembly has a larger radius.

8. The boiler denitration dilution fan device according to claim 5, characterized in that: The conical air inlet (12) is arranged in a conical shape, and the end close to the filtering assembly has the smallest radius, wherein the inner wall of the conical air inlet (12) and the flow dividing sheet (13) are coated with ceramic paint.

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