Automatic sampling device for fly ash in tail flue of boiler

Abstract

The invention discloses a boiler tail flue fly ash automatic sampling device, which belongs to the field of fly ash automatic sampling, and comprises a flue, a compressed air inlet pipeline is arranged below the flue, the compressed air inlet pipeline penetrates through the flue pipe wall and is communicated with a flue gas suction pipeline, the flue gas suction pipeline is provided with a flue gas suction channel, and the flue gas suction channel is communicated with the flue gas suction pipeline. One end, far away from the compressed air inlet pipeline, of the flue gas suction pipeline is communicated with a fly ash cyclone separator, one side, far away from the flue gas suction pipeline, of the fly ash cyclone separator is communicated with a flue gas outlet pipeline, and the flue gas outlet pipeline is communicated with the flue; a fly ash collecting hopper is arranged at the bottom end of the fly ash cyclone separator, and a fly ash sampling pipe is communicated with the lower portion of the fly ash collecting hopper. The fly ash sampling device can realize automatic sampling of fly ash in the tail flue of the boiler, is simple in structure, low in cost, excellent in sampling quality and effect and flexible in device arrangement, solves a series of problems caused by improper monitoring of sampling personnel, reduces the workload of the sampling personnel, and improves the working efficiency.

Description

Technical Field

[0001] The invention relates to the field of automatic fly ash sampling, and in particular to an automatic fly ash sampling device for a boiler tail flue. Background Art

[0002] The existing fly ash sampling of the tail flue of the boiler mainly relies on the natural ash accumulation in the specific area of ​​the tail flue, and the ash sample is extracted by gravity through the sampling tube installed at the ash accumulation position. In the current coal market context, there are many types of coal entering the boiler, and it is difficult to understand and analyze the combustion conditions of the coal types through traditional fly ash sampling methods. The reason is that traditional fly ash sampling collects ash samples in a natural ash accumulation way, and it is difficult to ensure that the ash samples are representative. When the sampling timing is not in place or the sampling device is not emptied (it is difficult to empty it in actual circumstances), it is easy to cause the target ash sample to be mixed with fly ash of other types of coal. In addition, the current fly ash sampling is manual sampling. In order to ensure the representativeness of the sampling, the ash collecting device must be emptied in time according to the changes in the coal entering the furnace, and the ash sample must be taken out before the next change in the coal entering the furnace. This is time-consuming and labor-intensive, and greatly increases the workload of personnel. Summary of the invention

[0003] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to propose an automatic sampling device for fly ash in the tail flue of a boiler, which can realize the extraction of flue gas, the separation of fly ash and flue gas, and the fly ash sample is timely and representative, solving a series of problems caused by the inadequate monitoring of the sampling personnel. At the same time, it reduces the workload of the sampler and improves the work efficiency.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] The present invention provides an automatic sampling device for fly ash in the tail flue of a boiler, comprising a flue, a compressed air intake pipe is arranged below the flue, the compressed air intake pipe penetrates the flue wall and is connected with a flue gas suction pipe, a flue gas suction channel is arranged on the flue gas suction pipe, one end of the flue gas suction pipe away from the compressed air intake pipe is connected with a fly ash cyclone separator, the side of the fly ash cyclone separator away from the flue gas suction pipe is connected with a flue gas outlet pipe, the flue gas outlet pipe is connected with the flue; a fly ash collecting bucket is arranged at the bottom of the fly ash cyclone separator, a fly ash sampling tube is connected below the fly ash collecting bucket.

[0006] The preferred technical solution of the present invention is that a flow guide is provided at the smoke intake channel; the flow guide includes a flow guide pipe, the top end of which is connected to the smoke intake channel, and a closing plate is provided at one end of the flow guide pipe close to the compressed air inlet pipe.

[0007] A preferred technical solution of the present invention is that the closing plate is an arc-shaped plate.

[0008] The preferred technical solution of the present invention is that the fly ash cyclone separator includes a separation barrel, the flue gas intake pipe is connected and horizontally extends into the separation barrel and is tangent to the separation barrel, an arc channel is provided inside the separation barrel at the outlet end of the flue gas intake pipe, a plurality of deceleration baffles are provided in the arc channel, through holes are provided on the deceleration baffles, and the bottom end of the arc channel is hollow and connected to the separation barrel.

[0009] A preferred technical solution of the present invention is that the cross section of the arc-shaped channel is an arc shape, and one side of the arc-shaped channel is fixedly connected to the inner wall of the separation barrel.

[0010] A preferred technical solution of the present invention is that the through holes on adjacent deceleration baffles are staggered up and down.

[0011] A preferred technical solution of the present invention is that an antistatic coating is provided on the inner wall of the arc-shaped channel and the surface of the deceleration baffle.

[0012] The preferred technical solution of the present invention is that a compressed air inlet solenoid valve is provided on the compressed air intake pipe, a mixed gas outlet solenoid valve is provided on the smoke outlet pipe, and a fly ash sampling door is provided on the fly ash sampling tube.

[0013] The preferred technical solution of the present invention is that a sub-plate is movably connected to one side of any of the deceleration baffles, the sub-plate is driven to approach or move away from the deceleration baffle by a power assembly, and a plurality of collection bags are arranged between the deceleration baffle and the sub-plate;

[0014] The multi-port collection bag comprises a plurality of single-port collection bags connected together with their openings facing upwards, a sealing strip is provided at the opening of the single-port collection bag, an electromagnet is built into the sealing strip, and the deceleration baffle and the auxiliary plate have opposite magnetic properties;

[0015] A processor is connected to each electromagnet and is used to control the magnetic direction of the electromagnet.

[0016] A preferred technical solution of the present invention is that the sealing strips are arranged in sequence along a direction perpendicular to the moving plane of the sub-plate.

[0017] The beneficial effects of the present invention are:

[0018] The present invention provides an automatic sampling device for fly ash in the flue at the tail end of a boiler. When the automatic sampling device for fly ash is working, compressed air is introduced from the compressed air intake pipe. The flow rate of the compressed air is much greater than the flow rate of the flue gas, thereby generating a Venturi effect, and the flue gas is sucked from the flue gas intake channel into the flue gas intake pipe and mixed with the compressed air and transported to the fly ash cyclone separator. The mixed flue gas carrying fly ash expands and releases pressure in the separator, rotates against the wall, and the fly ash particles are decelerated under the action of friction. Under the effect of gravity, the fly ash particles fall into the lower fly ash collection bucket, thereby achieving the effect of separating the flue gas from the fly ash. The mixed gas after the fly ash is separated is discharged from the opposite flue gas outlet pipe to the flue. Automatic sampling of fly ash in the flue at the tail end of the boiler can be realized, with a simple structure, low cost, excellent sampling quality and effect, and flexible device layout. At the same time, a series of problems caused by the inadequate monitoring of the sampling personnel are solved, and the workload of the sampling personnel is reduced, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the automatic sampling device for fly ash at the tail flue of a boiler provided in a specific embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the structure of the deflector;

[0021] Figure 3 is a top view of the fly ash cyclone separator;

[0022] Figure 4 It is a structural schematic diagram of the arc channel;

[0023] Figure 5 It is a schematic diagram of the coordination of the deceleration baffle, the auxiliary plate and the multi-port collection bag;

[0024] Figure 6 It is a schematic diagram of the structure of a multi-port collection bag.

[0025] In the figure:

[0026] 1. Flue; 2. Compressed air intake duct; 3. Flue gas suction duct; 4. Flue gas suction channel; 5. Fly ash cyclone separator; 6. Flue gas outlet duct; 7. Fly ash collecting bucket; 8. Fly ash sampling tube; 9. Guide; 10. Guide tube; 11. Closing plate; 12. Separation barrel; 13. Arc channel; 14. Speed ​​reduction baffle; 141. Sub-plate; 15. Through hole; 16. Inlet solenoid valve; 17. Outlet solenoid valve; 18. Fly ash sampling door; 19. Multi-port collection bag; 191. Sealing strip; 192. Single-port collection bag. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0028] Embodiment 1:

[0029] like Figure 1-4 As shown, the present invention provides an automatic sampling device for fly ash in the tail flue of a boiler, comprising a flue 1, a compressed air intake pipe 2 is arranged below the flue 1, the compressed air intake pipe 2 penetrates the pipe wall of the flue 1 and is connected with a flue gas suction pipe 3, a flue gas suction channel 4 is arranged on the flue gas suction pipe 3, an end of the flue gas suction pipe 3 away from the compressed air intake pipe 2 is connected with a fly ash cyclone separator 5, a side of the fly ash cyclone separator 5 away from the flue gas suction pipe 3 is connected with a flue gas outlet pipe 6, and the flue gas outlet pipe 6 is connected to the flue 1; a fly ash collecting bucket 7 is arranged at the bottom of the fly ash cyclone separator 5, and a fly ash sampling tube 8 is connected below the fly ash collecting bucket 7. When the automatic fly ash sampling device is working, compressed air is introduced from the compressed air inlet pipe 2. The flow rate of the compressed air is much greater than the flow rate of the flue gas, thus generating a Venturi effect. The flue gas is sucked into the flue gas intake pipe 3 from the flue 1 through the flue gas intake channel 4 and mixed with the compressed air and transported to the fly ash cyclone separator 5. The mixed flue gas carrying fly ash expands and releases pressure in the separator, rotates against the wall, and the fly ash particles are decelerated under the action of friction. Under the effect of gravity, the fly ash particles fall into the lower fly ash collecting bucket 7, thereby achieving the effect of separating the flue gas and fly ash. The mixed gas after the fly ash is separated is discharged from the opposite flue gas outlet pipe 6 to the flue 1.

[0030] Furthermore, in order to prevent the compressed air from partially overflowing into the flue 1 when passing through the smoke suction channel 4, resulting in an unsatisfactory smoke suction effect, a deflector 9 is provided at the smoke suction channel 4; the deflector 9 includes a deflector pipe 10, the top of which is connected to the smoke suction channel 4, and a closing plate 11 is provided at one end of the deflector pipe 10 close to the compressed air inlet pipe. The closing plate 11 is an arc-shaped plate, and the compressed air can be prevented from overflowing from the smoke suction channel 4 through the deflector pipe 10 and the closing plate 11. The existence of the deflector 9, while guiding the compressed air, also reduces the flow cross-section of the compressed air at this position, and the arc-shaped closing plate 11 allows the compressed air to flow smoothly from this place to avoid turbulence, thereby increasing the flow rate of the compressed air at this place, strengthening the Venturi effect, and enhancing the smoke suction capacity.

[0031] Furthermore, the fly ash cyclone separator 5 includes a separation barrel 12, the flue gas suction pipe 3 is connected and horizontally extends into the separation barrel 12 and is tangent to the separation barrel 12, an arc-shaped channel 13 is provided inside the separation barrel 12 at the outlet end of the flue gas suction pipe 3, a plurality of deceleration baffles 14 are provided in the arc-shaped channel 13, a through hole 15 is provided on the deceleration baffle 14, and the bottom end of the arc-shaped channel 13 is hollow and connected to the separation barrel 12. The mixed flue gas carrying fly ash enters the separator at high speed from the tangential direction. When the mixed flue gas just enters the separation barrel 12, due to the expansion and pressure relief, the large fly ash particles fall under the action of gravity, and fall into the collection bucket below the heavy arc channel 13. The mixed flue gas continues to flow along the arc channel 13 and passes through the through hole 15 on the deceleration baffle 14. When the mixed flue gas passes through the deceleration baffle 14, impact deceleration will occur, and large fly ash particles will be separated through inertia and gravity, thereby improving the separation efficiency. After passing through the arc channel 13, the mixed flue gas will rotate along the inner wall of the separation barrel 12, and the small fly ash particles in the mixed flue gas will be decelerated by friction with the inner wall. Under the effect of gravity, the small fly ash particles fall into the lower fly ash collection bucket 7.

[0032] The arc channel 13 has an arc cross section, and one side of the arc channel 13 is fixedly connected to the inner wall of the separation barrel 12. After the mixed flue gas enters the separation barrel 12, it rotates along the arc channel 13 to generate centrifugal force, causing the fly ash to hit the inner wall of the arc channel 13, and then fall along the inner wall of the arc channel 13. The arc channel 13 is set to be an arc to ensure that the fly ash can gather at the bottom and fall into the fly ash collection bucket 7, preventing the fly ash from being taken away by the gas again.

[0033] The through holes 15 on the adjacent deceleration baffles 14 are arranged in an up-down staggered manner. When the mixed flue gas passes through the through hole 15 of the preceding deceleration baffle 14, it will hit the following deceleration baffle 14, thereby improving the separation efficiency.

[0034] During the collision and friction process, fly ash will generate static electricity, which will be adsorbed on the inner wall of the arc channel 13 and the deceleration baffle 14, thereby affecting the accuracy of the next sampling. Therefore, an anti-static coating is provided on the inner wall of the arc channel 13 and the surface of the deceleration baffle 14 to prevent fly ash from adhering to them due to static electricity.

[0035] Furthermore, a compressed air inlet solenoid valve 16 is provided on the compressed air inlet pipe 2, a mixed gas outlet solenoid valve 17 is provided on the smoke outlet pipe 6, and a fly ash sampling door 18 is provided on the fly ash sampling pipe 8. The switches of the solenoid valves can be controlled by remote control to achieve remote ash sample collection.

[0036] Working principle:

[0037] When the automatic fly ash sampling device is working, the compressed air inlet solenoid valve 16 and the mixed gas outlet solenoid valve 17 are opened, and compressed air is introduced to produce a Venturi effect, and the flue gas is sucked in from the flue gas suction channel 4 and mixed with the compressed air and transported to the fly ash cyclone separator 5. The mixed flue gas carrying fly ash enters the separator at high speed from the tangential direction, expands and releases pressure in the separator, and under the action of the arc channel 13 and the deceleration baffle 14, the fly ash particles are decelerated under the action of friction, and fall into the lower fly ash collection bucket 7 under the effect of gravity, thereby achieving the effect of separating flue gas from fly ash. The mixed gas after separating the fly ash is discharged from the opposite tangentially connected flue gas outlet pipe 6 to the flue 1. When extracting fly ash samples, the inlet and outlet solenoid valves 17 of the device are closed, and the fly ash sampling door 18 is opened to extract ash samples.

[0038] In addition, the commissioning and shutdown of the device can be remotely controlled. When commissioned, it works intermittently at the same interval according to the pre-set time, such as running for five minutes and then stopping for five minutes as a cycle. The operation and shutdown time can be freely set according to the actual situation. The purpose of this setting is mainly to reduce the compressed air entering the flue 1, reduce the power consumption of the fan, and save energy and reduce emissions. The ash samples collected are representative, and the ash sample weight is reasonably reduced to avoid excessive unused ash samples caused by traditional sampling methods, which pollutes the working environment.

[0039] Embodiment 2 includes all the contents of Embodiment 1:

[0040] like Figure 5-6 As shown, a sub-plate 141 is arranged on the side of one of the deceleration baffles 14 away from the flow of fly ash, and the sub-plate 141 is relatively rotatably connected to the deceleration baffle 14. A power assembly is also installed on the deceleration baffle 14, and the power assembly drives the sub-plate 141 to rotate relative to the deceleration baffle 14;

[0041] A multi-port collection bag 19 is connected between the deceleration baffle 14 and the sub-plate 141. The multi-port collection bag 19 has a plurality of spaces with independent upward openings for collecting fly ash; the multi-port collection bag 19 includes a plurality of single-port collection bags 192 connected together, and the lower ends of the plurality of single-port collection bags 192 connected together are commonly fixed to the side wall of the deceleration baffle 14, one side of the leftmost single-port collection bag 192 is fixed to the deceleration baffle 14, and one side of the rightmost single-port collection bag 192 is fixed to the sub-plate 141, and two sealing strips 191 are arranged at the upper opening of the single-port collection bag 192, and one sealing strip 191 is shared between two adjacent single-port collection bags 192, and each sealing strip 191 has an electromagnet built in it (not shown in the drawings); magnetic parts (iron blocks) with opposite magnetism are arranged in the areas where the deceleration baffle 14 and the sub-plate 141 cooperate with the sealing strip 191.

[0042] A processor, the processor being electrically connected to each magnetic component;

[0043] Working principle:

[0044] Since the separation barrel 12 of the fly ash cyclone separator 5 contacts the fly ash of each time period, the fly ash passes through the separation barrel 12 and falls into the fly ash collecting bucket 7, and there is a possibility that the sampled fly ash is mixed with the fly ash of other time periods.

[0045] Conventionally, the sub-plate 141 is attached to the deceleration baffle 14 so that the multi-port collection bag 19 can be reduced in size.

[0046] When the first group of fly ash needs to be sampled, first, the processor controls each magnetic component to be magnetically attracted to the deceleration baffle 14, and the power assembly drives the sub-plate 141 to rotate a set angle relative to the deceleration baffle 14. At this time, the single-mouth collection bag 192 on the far right is opened to collect fly ash.

[0047] After the fly ash is collected, the sub-plate 141 is attached to the deceleration partition 14 to close the openings of all the single-port collection bags 192 .

[0048] When the second group of fly ash needs to be sampled, first, the magnetic direction of the rightmost magnetic part changes to magnetically attract and cooperate with the auxiliary plate 141, so that the opening of the rightmost single-port collection bag 192 is in a closed state, and the other magnetic parts are magnetically attracted and cooperate with the deceleration partition 14. Then the power component drives the auxiliary plate 141 to rotate the set angle relative to the deceleration partition 14. At this time, the opening of the second group of single-port collection bags 192 from the right is opened for collecting fly ash. The openings of other single-port collection bags 192 are closed.

[0049] Subsequent sampling refers to the above steps, so that during sampling, only one single-port collection bag 192 is opened to collect fly ash, while the openings of the other single-port collection bags 192 are in a closed state.

[0050] When there is no need to sample the fly ash, the sub-plate 141 is attached to the deceleration partition 14 to close the openings of all the single-port collection bags 192. At the same time, each sealing strip 191 is located at a different height and closed and overlapped.

[0051] A window may be installed on the side wall of the separation barrel 12 corresponding to the deceleration baffle 14 , which is used for the entry and exit of the deceleration baffle 14 , and the deceleration baffle 14 may be detachably installed on the inner wall of the arc-shaped channel 13 .

[0052] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. A boiler tail flue (1) fly ash automatic sampling device, characterized in that: It comprises a flue (1), a compressed air intake pipe (2) is provided below the flue (1), the compressed air intake pipe (2) penetrates the pipe wall of the flue (1) and is connected to a flue gas suction pipe (3), a flue gas suction channel (4) is provided on the flue gas suction pipe (3), one end of the flue gas suction pipe (3) away from the compressed air intake pipe (2) is connected to a fly ash cyclone separator (5), the side of the fly ash cyclone separator (5) away from the flue gas intake pipe (3) is connected to a flue gas outlet pipe (6), and the flue gas outlet pipe (6) is connected to the flue (1); A fly ash collecting hopper (7) is provided at the bottom end of the fly ash cyclone separator (5), and a fly ash sampling pipe (8) is connected below the fly ash collecting hopper (7).

2. The automatic fly ash sampling device for the boiler tail flue (1) according to claim 1 is characterized by: A flow guide (9) is provided at the smoke inlet passage (4); The deflector (9) comprises a deflector pipe (10), the top end of which is in communication with the smoke inlet passage (4), and a closing plate (11) is provided at one end of the deflector pipe (10) close to the compressed air inlet pipe.

3. The automatic fly ash sampling device for the boiler tail flue (1) according to claim 2 is characterized by: The closing plate (11) is an arc-shaped plate.

4. The automatic fly ash sampling device for the boiler tail flue (1) according to claim 1 is characterized by: The fly ash cyclone separator (5) comprises a separation barrel (12), the flue gas intake pipe (3) is connected and horizontally extends into the separation barrel (12) and is tangent to the separation barrel (12), an arc-shaped channel (13) is provided inside the separation barrel (12) at the outlet end of the flue gas intake pipe (3), a plurality of deceleration baffles (14) are provided in the arc-shaped channel (13), and a through hole (15) is provided on the deceleration baffle (14), and the bottom end of the arc-shaped channel (13) is hollow and connected to the separation barrel (12).

5. The automatic fly ash sampling device for the boiler tail flue (1) according to claim 4 is characterized by: The cross section of the arc-shaped channel (13) is in the shape of an arc, and one side of the arc-shaped channel (13) is fixedly connected to the inner wall of the separation barrel (12).

6. The automatic fly ash sampling device for the boiler tail flue (1) according to claim 4 is characterized by: The through holes (15) on the adjacent deceleration baffles (14) are arranged in an up-and-down staggered manner.

7. The automatic fly ash sampling device for the boiler tail flue (1) according to claim 4 is characterized by: The inner wall of the arc-shaped channel (13) and the surface of the deceleration baffle (14) are provided with an antistatic coating.

8. The automatic fly ash sampling device for the boiler tail flue (1) according to claim 4 is characterized by: The compressed air inlet pipe (2) is provided with a compressed air inlet electromagnetic valve (16), the smoke outlet pipe (6) is provided with a mixed gas outlet electromagnetic valve (17), and the fly ash sampling pipe (8) is provided with a fly ash sampling door (18).

9. The automatic fly ash sampling device for the boiler tail flue (1) according to claim 4 is characterized by: A sub-plate (141) is movably connected to one side of any of the deceleration baffles (14), and the sub-plate (141) is driven by a power assembly to move closer to or farther from the deceleration baffle (14), and a plurality of collection bags (19) are arranged between the deceleration baffle (14) and the sub-plate (141); The multi-port collection bag (19) comprises a plurality of single-port collection bags (192) connected together and opening upward, a sealing strip (191) is provided at the opening of the single-port collection bag (192), an electromagnet is built into the sealing strip (191), and the deceleration baffle (14) and the auxiliary plate (141) have opposite magnetic properties; A processor is connected to each electromagnet and is used to control the magnetic direction of the electromagnet.

10. The automatic fly ash sampling device for the boiler tail flue (1) according to claim 9, characterized in that: The sealing strips (191) are arranged in sequence along a direction perpendicular to the moving plane of the sub-plate (141).

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