Denitration and temperature regulation bypass horizontal flue ash removal device

Abstract

The utility model discloses an ash removal device for a horizontal flue of a denitration temperature-regulating bypass. Comprising a boiler reversing chamber; the temperature adjusting bypass at least comprises a horizontal flue, the horizontal flue is communicated with the boiler reversing chamber, and a disconnecting piece is arranged on the horizontal flue; the ash removal assembly comprises an ash removal part, a gas conveying pipeline and a gas supply unit, the ash removal part is arranged on one side or two sides of the turn-off part, and the gas supply unit is used for conveying gas to the ash removal part through the gas conveying pipeline so as to blow away dust on one side or two sides of the turn-off part. And dust in the horizontal flue can be removed.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitration in thermal power plants, in particular to a dust cleaning device for a denitration temperature regulation bypass horizontal flue. Background Technique

[0002] To realize the normal and stable operation of the SCR flue gas denitration device under low load, most coal-fired power plants adopt a temperature regulation bypass transformation scheme, that is, a temperature regulation bypass flue is led from the boiler turning chamber, and a shut-off baffle and a regulating baffle are installed to regulate the flue gas temperature at the inlet of the SCR device. Generally, under the high-load condition of the boiler, the shut-off baffle on the temperature regulation bypass is closed; under the low-load condition of the boiler, when the flue gas temperature is lower than 300 °C, the shut-off baffle is opened. However, during the actual operation process, when the shut-off baffle of the temperature regulation bypass flue is closed, a "dead zone" will be formed at both ends before and after the shut-off baffle. Over time, serious ash accumulation will occur at the position of the temperature regulation bypass horizontal flue. If the ash is not cleaned in time, it is easy to cause mechanical jamming of the shut-off baffle, resulting in the fact that when the unit is under high load and the shut-off baffle needs to be completely closed, the baffle door cannot be closed tightly, affecting the thermal efficiency of the unit; and when the unit is under low load and the baffle door needs to be opened, it cannot be completely opened, or due to serious ash accumulation in the horizontal flue, the resistance of the temperature regulation bypass flue increases, and an effective pressure difference cannot be formed, resulting in less high-temperature flue gas entering the SCR denitration reactor, and the flue gas temperature cannot meet the requirements for the operation of denitration.

[0003] To sum up, in order to avoid problems such as ash accumulation in the temperature regulation bypass horizontal flue, mechanical jamming and air leakage of the shut-off baffle, and improve the stability and reliability of the temperature regulation bypass, we propose a dust cleaning device for the temperature regulation bypass horizontal flue of denitration. Content of the Utility Model

[0004] The utility model discloses a dust cleaning device for a denitration temperature regulation bypass horizontal flue, which can remove the dust in the horizontal flue. The device includes:

[0005] A boiler turning chamber;

[0006] A temperature regulation bypass, at least including a horizontal flue, the horizontal flue is communicated with the boiler turning chamber, and a shut-off member is arranged on the horizontal flue;

[0007] A dust cleaning assembly, including a dust cleaning member, a gas transmission pipeline and a gas supply unit, the dust cleaning member is arranged on one side or both sides of the shut-off member, and the gas supply unit is used to convey gas to the dust cleaning member through the gas transmission pipeline to blow away the dust on one side or both sides of the shut-off member.

[0008] Optionally, the soot cleaning member includes a main soot cleaning pipe, soot cleaning branch pipes, and elbow pipes. A pipe cap is provided at one end of the main soot cleaning pipe. The other end of the main soot cleaning pipe faces the bottom of the horizontal flue and is communicated with the gas transmission pipeline. The lower side of the main soot cleaning pipe is communicated with the elbow pipes through the soot cleaning branch pipes. The outlet direction of the elbow pipes is consistent with the flowing direction of the flue gas in the horizontal flue.

[0009] Optionally, the number of the soot cleaning branch pipes is one or more. When the number of the soot cleaning branch pipes is multiple, the distance between any two adjacent soot cleaning branch pipes is 150-200 mm.

[0010] Optionally, the number of the soot cleaning assemblies on the horizontal flue is one or more. When the number of the soot cleaning assemblies is multiple, the distance between any two adjacent soot cleaning assemblies is 700-1000 mm.

[0011] Optionally, the distance between the soot cleaning assembly and the bottom of the horizontal flue is 120-200 mm.

[0012] Optionally, the gas transmission pipeline includes:

[0013] A main gas supply path, on which a manual valve, an electric valve, and a pressure gauge are provided;

[0014] Multiple gas supply branch paths, one ends of the multiple gas supply branch paths are communicated with the main gas supply path, and the other ends of the multiple gas supply branch paths are respectively communicated with the soot cleaning members on the horizontal flue through metal hoses.

[0015] Optionally, an observation hole is provided on the horizontal flue. The observation hole is provided on one side or both sides of the shut-off member. The distance between the observation hole and the bottom of the horizontal flue is 300-400 mm.

[0016] Optionally, the gas conveyed by the gas supply unit is any one of compressed air, steam, or boiler gas.

[0017] Optionally, the temperature regulating bypass further includes a turning flue and a vertical flue. The vertical flue is communicated with the horizontal flue through the turning flue. A compensator is provided at the connection position of the turning flue and the horizontal flue. An adjusting member is provided on the vertical flue.

[0018] Optionally, soot cleaning members are provided on one side or both sides of the compensator. The soot cleaning members are communicated with the gas transmission pipeline.

[0019] The beneficial effects brought by the technical solution provided by the embodiments of the present disclosure are:

[0020] In an embodiment of the present disclosure, a dust cleaning device is provided. A dust cleaning assembly is arranged in the device. The dust cleaning assembly includes a dust cleaning member, an air delivery pipeline, and a gas supply unit. The gas supply unit conveys gas to the dust cleaning member through the air delivery pipeline, thereby blowing away the dust on the side of the shut-off member, which can avoid the influence of dust on the shut-off effect of the shut-off member, and can also effectively avoid excessive accumulation of dust inside the horizontal flue, improving the stability and reliability of the temperature regulation bypass. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 FIG. is a schematic structural diagram of a dust cleaning device for a denitration temperature regulation bypass horizontal flue provided by an embodiment of the present disclosure;

[0023] Figure 2 FIG. is a schematic structural diagram of a dust cleaning member provided by an embodiment of the present disclosure;

[0024] Figure 3 FIG. is a schematic structural diagram of another dust cleaning member provided by an embodiment of the present disclosure.

[0025] The reference numerals are as follows:

[0026] 1: Boiler turning chamber;

[0027] 2: Temperature regulation bypass; 21: Horizontal flue; 211: Observation hole; 22: Shut-off member; 23: Reducing flue; 24: Turning flue; 25: Vertical flue; 26: Compensator; 27: Adjusting member;

[0028] 3: Dust cleaning assembly; 31: Dust cleaning member; 311: Dust cleaning main pipe; 312: Dust cleaning branch pipe; 313: Elbow; 314: Pipe cap; 32: Air delivery pipeline; 321: Main gas supply path; 3211: Manual valve; 3212: Electric valve; 3213: Pressure gauge; 322: First gas supply branch; 323: Second gas supply branch; 324: Metal hose; 33: Gas supply unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] Figure 1 It is a schematic structural diagram of a denitration temperature adjustment bypass horizontal flue dust cleaning device provided by an embodiment of the present disclosure. Refer to Figure 1 , the device includes:

[0031] A boiler turning chamber 1;

[0032] A temperature adjustment bypass 2, which at least includes a horizontal flue 21. The horizontal flue 21 is communicated with the boiler turning chamber 1, and a shut-off member 22 is arranged on the horizontal flue 1;

[0033] A dust cleaning assembly 3, which includes a dust cleaning member 31, an air delivery pipeline 32 and an air supply unit 33. The dust cleaning member 31 is arranged on one or both sides of the shut-off member 22, and the air supply unit 33 is used to convey gas to the dust cleaning member 31 through the air delivery pipeline 32 to blow away the dust on one or both sides of the shut-off member 22.

[0034] In an embodiment of the present disclosure, a dust cleaning device is provided. A dust cleaning assembly is arranged in the device. The dust cleaning assembly includes a dust cleaning member, an air delivery pipeline and an air supply unit. The air supply unit conveys gas to the dust cleaning member through the air delivery pipeline, so as to blow away the dust on the side of the shut-off member, which can avoid the influence of dust on the shut-off effect of the shut-off member, and can also effectively avoid excessive accumulation of dust inside the horizontal flue, and improve the stability and reliability of the temperature adjustment bypass.

[0035] Figure 2 It is a schematic structural diagram of a dust cleaning member provided by an embodiment of the present disclosure. Figure 2 It is a schematic diagram of the bottom of the dust cleaning member.

[0036] Figure 3 It is a schematic structural diagram of another dust cleaning member provided by an embodiment of the present disclosure. Figure 3 It is a cross-sectional view of the dust cleaning member in the vertical direction. Also refer to Figure 2 and Figure 3, the soot cleaning member 31 includes a main soot cleaning pipe 311, soot cleaning branch pipes 312 and elbow pipes 313. One end of the main soot cleaning pipe 311 is provided with a pipe cap 314. The other end of the main soot cleaning pipe 311 faces the bottom of the horizontal flue 21 and is communicated with the gas transmission pipeline 32. The lower side of the main soot cleaning pipe 311 is communicated with the elbow pipe 313 through the soot cleaning branch pipes 312. The gas outlet direction of the elbow pipe 313 is consistent with the smoke flow direction in the horizontal flue 21.

[0037] In the embodiment of the present disclosure, the main soot cleaning pipe is parallel to the bottom of the horizontal flue. One end of the main soot cleaning pipe is closed by a pipe cap, and the other end is communicated with the gas transmission pipeline. When the gas transmission pipeline conveys gas into the main soot cleaning pipe, the gas sprays out from the elbow pipe along the soot cleaning branch pipes, blowing away the dust accumulated at the bottom of the horizontal flue. The arrangement of the soot cleaning branch pipes can preferably connect the main soot cleaning pipe and the elbow pipe.

[0038] It should be noted that the horizontal arrangement of the main soot cleaning pipe in the horizontal flue may mean that "the main soot cleaning pipe is parallel to the shut-off member and is horizontally arranged in the horizontal flue", or it may also mean that "the main soot cleaning pipe is parallel to the horizontal flue and is horizontally arranged in the horizontal flue". In addition, the main soot cleaning pipe may form a certain angle with the horizontal flue, and the present disclosure does not limit this.

[0039] Of course, in other embodiments, the main soot cleaning pipe may be vertically arranged in the horizontal flue, such as being perpendicular to the horizontal flue. In addition, the main soot cleaning pipe may also stand in the horizontal flue and form a certain angle with the horizontal flue.

[0040] In the embodiment of the present disclosure, the distance between the elbow pipe 313 and the bottom of the horizontal flue 21 is 30 - 60 mm.

[0041] Exemplarily, the distance between the elbow pipe and the bottom of the horizontal flue is 40 mm.

[0042] In the embodiment of the present disclosure, the gas sprays out from the elbow pipe to blow away the dust. By setting the elbow pipe at the above distance, it can be ensured that the gas sprayed out from the elbow pipe can preferably blow the dust in the horizontal flue.

[0043] In the embodiment of the present disclosure, the number of the soot cleaning branch pipes 312 is one or more. When the number of the soot cleaning branch pipes 312 is multiple, the distance between any two adjacent soot cleaning branch pipes 312 is 150 - 200 mm.

[0044] Exemplarily, when the number of the soot cleaning branch pipes 312 is multiple, the distance between any two adjacent soot cleaning branch pipes 312 is 180 mm.

[0045] Among them, the elbow pipes and the soot cleaning branch pipes are arranged in one-to-one correspondence.

[0046] In the embodiments of the present disclosure, the number of the dust cleaning branch pipes can be multiple, so the number of the elbow pipes will also be multiple. By spraying gas through multiple elbow pipes simultaneously, the dust cleaning effect can be effectively improved.

[0047] Refer to again Figure 1 , in the embodiments of the present disclosure, the number of the dust cleaning assemblies 3 on the horizontal flue is one or more. When the number of the dust cleaning assemblies 3 is multiple, the distance between any two adjacent dust cleaning assemblies 3 is 700-1000 mm.

[0048] Exemplarily, when the number of the dust cleaning assemblies 3 is multiple, the distance between any two adjacent dust cleaning assemblies 3 is 800 mm.

[0049] In the embodiments of the present disclosure, the number of the dust cleaning assemblies can be multiple. Setting multiple dust cleaning assemblies can effectively ensure the dust cleaning effect on the horizontal flue. And setting the dust cleaning assemblies according to the above-mentioned distance can ensure the dust cleaning effect in the horizontal flue. At the same time, it can also ensure that the number of the dust cleaning assemblies is set less to ensure a lower manufacturing cost.

[0050] In the embodiments of the present disclosure, the distance between the dust cleaning assembly 3 and the bottom of the horizontal flue 21 is 120-200 mm.

[0051] Exemplarily, the distance between the dust cleaning assembly 3 and the bottom of the horizontal flue 21 is 150 mm.

[0052] Wherein, the distance between the dust cleaning assembly and the bottom of the horizontal flue refers to the distance between the opening for spraying gas of the dust cleaning assembly and the bottom of the horizontal flue.

[0053] In the embodiments of the present disclosure, setting the dust cleaning assemblies according to the above-mentioned distance can ensure a large coverage range of the gas sprayed by the dust cleaning assemblies. At the same time, it can also ensure a good dust cleaning effect after the gas sprayed by the dust cleaning assemblies reaches the bottom of the horizontal flue.

[0054] In the embodiments of the present disclosure, the gas transmission pipeline 32 includes:

[0055] A main gas supply path 321, on which a manual valve 3211, an electric valve 3212 and a pressure gauge 3213 are arranged;

[0056] Multiple gas supply branch paths, one ends of the multiple gas supply branch paths are communicated with the main gas supply path 321, and the other ends of the multiple gas supply branch paths are respectively communicated with the dust cleaning members 31 on the horizontal flue 21 through metal hoses 324.

[0057] In the embodiments of the present disclosure, a manual valve and an electric valve are provided on the main gas supply line, which can ensure that when the electric valve is damaged, the main gas supply line can still be closed through the manual valve. A pressure gauge is provided to monitor the pressure of the transported gas in real time, avoiding the situation where the pressure of the transported gas is too small and affecting the dust removal effect. And setting multiple gas supply branches can supply gas to multiple dust cleaning components respectively, and setting metal hoses can effectively reduce the negative impact brought by the thermal expansion of the flue.

[0058] In the embodiments of the present disclosure, the electric valve can also be provided on multiple gas supply branches, such as one electric valve is provided on one gas supply branch.

[0059] In the embodiments of the present disclosure, the metal hose can be formed of 304 stainless steel or 306L stainless steel. Of course, the metal hose can also be replaced by a high-temperature resistant non-metallic compensator.

[0060] In the embodiments of the present disclosure, the gas supply branch includes a first gas supply branch 322 and a second gas supply branch 323.

[0061] In the embodiments of the present disclosure, the horizontal flue 21 is provided with an observation hole 211, the observation hole 211 is provided on one side or both sides of the shut-off member 22, and the distance between the observation hole 211 and the bottom of the horizontal flue 21 is 300 - 400 mm.

[0062] Exemplarily, the horizontal flue is provided with an observation hole, the observation hole is provided on both sides of the shut-off member, and the distance between the observation hole and the bottom of the horizontal flue is 350 mm.

[0063] In the embodiments of the present disclosure, setting the observation hole can facilitate the operator to observe the dust accumulation situation on the side of the shut-off member. With the above distance, it can ensure that the operator can better observe the dust on the side of the shut-off member through the observation hole.

[0064] In the embodiments of the present disclosure, the gas transported by the gas supply unit 33 is any one of compressed air, steam or boiler gas.

[0065] Exemplarily, the gas transported by the gas supply unit is compressed air.

[0066] In the embodiments of the present disclosure, when the gas supply unit uses compressed air as the gas transported to the dust cleaning component, the pressure of the compressed air is relatively large, which can ensure the dust removal effect. If steam or boiler gas is used as the gas transported to the dust cleaning component, the dust removal effect can also be ensured. At the same time, the steam and boiler gas can be the boiler gas or steam generated by the thermal power generation device itself. Without additionally setting other devices as the gas supply unit, the thermal power generation device serves as the gas supply unit.

[0067] In the embodiments of the present disclosure, the regulating bypass further includes a reducing flue 23, and the horizontal flue 21 is communicated with the boiler turning chamber 1 through the reducing flue 23.

[0068] In the embodiments of the present disclosure, the included angle between the bottom of the reducing flue 23 and the boiler turning chamber 1 is 35° - 60°.

[0069] Exemplarily, the included angle between the bottom of the reducing flue 23 and the boiler turning chamber 1 is 45°.

[0070] In the embodiments of the present disclosure, arranging the reducing flue can facilitate the dust to slide down from the reducing flue and avoid dust accumulation.

[0071] In the embodiments of the present disclosure, the temperature regulating bypass 2 further includes a turning flue 24 and a vertical flue 25. The vertical flue 25 is communicated with the horizontal flue 21 through the turning flue 24. A compensator 26 is arranged at the connection position of the turning flue 24 and the horizontal flue 21, and a regulating member 27 is arranged on the vertical flue 25.

[0072] Wherein, the regulating member 27 is used to regulate the closing degree of the vertical flue, and the regulating member 27 can be a regulating baffle.

[0073] In the embodiments of the present disclosure, arranging the compensator can absorb the thermal expansion in the temperature regulating bypass.

[0074] In the embodiments of the present disclosure, the turning angle of the turning flue is 90°. Of course, the turning angle of the turning flue can also be other angles.

[0075] In the embodiments of the present disclosure, ash cleaning members 31 are arranged on one side or both sides of the compensator 26, and the ash cleaning members 31 are communicated with the gas transmission pipeline 32.

[0076] In the embodiments of the present disclosure, arranging the ash cleaning members on the side surface of the compensator can avoid dust accumulation on the lower bottom surface of the compensator.

[0077] It should be noted that the present utility model has the following advantages:

[0078] First, the device has a simple structure and low cost. Compressed air, steam or the primary hot air of the boiler is used as the soot blowing gas source, and multiple soot blowing gas sources are used as backups for each other, improving the reliability of the soot cleaning device.

[0079] Second, the soot cleaning device is reasonably designed, which can effectively avoid problems such as ash accumulation in the horizontal flue of the temperature regulating bypass, mechanical jamming and air leakage of the shut-off member, and improve the stability and reliability of the temperature regulating bypass device.

[0080] Third, through the observation hole of the horizontal flue, it is possible to check at any time whether there is ash accumulation in the horizontal flue, timely adjust the soot blowing frequency, and operate economically.

[0081] Fourth, a metal hose is used to connect the ash cleaning component and the air supply pipeline, eliminating the influence of the thermal expansion of the flue.

[0082] Fifth, the ash cleaning component can be flexibly arranged according to the size of the horizontal flue, with a large cleaning range and a wide application range.

[0083] Sixth, a pipeline electric valve is set up to clean the ash regularly. At the same time, the configuration quantity of the electric valve can be flexibly adjusted according to the quantity of the ash cleaning components, improving the economy of the device.

[0084] The embodiment of the present disclosure also provides a usage method of the ash cleaning device:

[0085] When the temperature regulating bypass device is not put into operation, regularly (once a week or once every half month) check the ash accumulation situation in the flue through the observation hole of the horizontal flue, and turn on the ash cleaning device to remove the ash in the flue. After the ash in the variable-diameter flue is purged by the ash cleaning component, it flows along the bottom plate of the variable-diameter flue to the boiler turning chamber; the ash in the horizontal flue is purged by the ash cleaning component and then flows to the turning flue, and then to the SCR denitration reactor through the vertical flue. Avoid ash accumulation in the horizontal flue section, which affects the normal opening of the shut-off component.

[0086] After the temperature regulating bypass device is normally put into operation, turn on the ash cleaning device regularly, check through the observation hole of the horizontal flue, and adjust the ash cleaning frequency according to the inspection situation for economic operation.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A denitration temperature-adjusting bypass horizontal flue soot cleaning device, characterized in that, Comprising: The boiler turning chamber; The temperature regulating bypass, at least including a horizontal flue, the horizontal flue is communicated with the boiler turning chamber, and a shut-off member is arranged on the horizontal flue; The soot cleaning assembly, including a soot cleaning member, a gas transmission pipeline and a gas supply unit, the soot cleaning member is arranged on one side or both sides of the shut-off member, and the gas supply unit is used to convey gas to the soot cleaning member through the gas transmission pipeline to blow away the dust on one side or both sides of the shut-off member.

2. The denitration temperature adjustment bypass horizontal flue ash cleaning device according to claim 1, wherein, The soot cleaning member includes a main soot cleaning pipe, soot cleaning branch pipes and elbow pipes. A pipe cap is arranged at one end of the main soot cleaning pipe. The other end of the main soot cleaning pipe faces the bottom of the horizontal flue and is communicated with the gas transmission pipeline. The lower side of the main soot cleaning pipe is communicated with the elbow pipes through the soot cleaning branch pipes, and the air outlet direction of the elbow pipes is consistent with the flue gas flow direction in the horizontal flue.

3. The denitration temperature adjustment bypass horizontal flue dust cleaning device according to claim 2, characterized in that The number of the soot cleaning branch pipes is one or more. When the number of the soot cleaning branch pipes is more than one, the distance between any two adjacent soot cleaning branch pipes is 150 - 200 mm.

4. The denitration temperature adjustment bypass horizontal flue dust cleaning device according to claim 1, wherein, The number of the soot cleaning assemblies on the horizontal flue is one or more. When the number of the soot cleaning assemblies is more than one, the distance between any two adjacent soot cleaning assemblies is 700 - 1000 mm.

5. The denitration temperature-adjusting bypass horizontal flue soot cleaning device according to claim 1, characterized in that, The distance between the soot cleaning assembly and the bottom of the horizontal flue is 120 - 200 mm.

6. The denitration temperature adjustment bypass horizontal flue dust cleaning device according to any one of claims 1 to 5, characterized in that, The gas transmission pipeline includes: The main gas supply path, on which a manual valve, an electric valve and a pressure gauge are arranged; A plurality of gas supply branch paths, one ends of the plurality of gas supply branch paths are communicated with the main gas supply path, and the other ends of the plurality of gas supply branch paths are respectively communicated with the soot cleaning members on the horizontal flue through metal hoses.

7. The denitration temperature adjustment bypass horizontal flue dust cleaning device according to any one of claims 1 to 5, characterized in that An observation hole is arranged on the horizontal flue, the observation hole is arranged on one side or both sides of the shut-off member, and the distance between the observation hole and the bottom of the horizontal flue is 300 - 400 mm.

8. The denitration temperature adjustment bypass horizontal flue ash cleaning device according to any one of claims 1 to 5, characterized in that, The gas conveyed by the gas supply unit is any one of compressed air, steam or boiler gas.

9. The denitration temperature adjustment bypass horizontal flue dust cleaning device according to any one of claims 1 to 5, characterized in that, The temperature regulating bypass further includes a turning flue and a vertical flue. The vertical flue is communicated with the horizontal flue through the turning flue. A compensator is arranged at the connection position between the turning flue and the horizontal flue, and a regulating member is arranged on the vertical flue.

10. The denitrification temperature regulation bypass horizontal flue dust cleaning device according to claim 9, characterized in that, Soot cleaning members are arranged on one side or both sides of the compensator, and the soot cleaning members are communicated with the gas transmission pipeline.

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