Efficient energy-saving type pneumatic slag poking device for boiler slag falling pipe

Abstract

The invention belongs to the technical field of boiler structures, and particularly relates to a high-efficiency energy-saving pneumatic slag poking device for a boiler slag falling pipe, which structurally comprises the slag falling pipe, a stop valve arranged at the lower end pipe orifice of the slag falling pipe, an expansion joint arranged on the slag falling pipe, and a transverse air inlet pipe arranged on the slag falling pipe, the pneumatic slag poking device at least has the beneficial effects that during pneumatic slag poking operation, the stop valve can be closed, so that unburnt red slag and large coke blocks return to the furnace, a blocked section in the slag falling pipe can be dredged, heat contained in the red slag can be prevented from being wasted, dust can be prevented from being generated, and the stop valve is opened after the pneumatic slag poking operation; and the normal deslagging function is not influenced.

Description

Technical Field

[0001] The invention belongs to the technical field of boiler structures, and in particular relates to a high-efficiency and energy-saving pneumatic slag-poking device for a boiler slag-dropping pipe. Background Art

[0002] Boiler refers to a kind of energy conversion equipment. Generally, combustion operation is carried out in the boiler to output steam with a certain amount of thermal energy, which can directly provide thermal energy or indirectly provide electrical energy.

[0003] The structure of the boiler mainly includes the furnace body, smoke exhaust pipe, slag pipe, and steam drum. Since the boiler started to burn sludge, the slag pipe has been blocked more frequently. There are two main methods for removing slag from the slag pipe: manual slag removal and air cannon slag removal. The former is relatively dangerous, while the latter is relatively safe and advanced.

[0004] For example, the Chinese utility model patent with authorization announcement number CN209857037U and authorization announcement date 2019.12.27 discloses a circulating fluidized bed boiler slag prying device, whose structure includes: a slag discharge pipe, an anti-fall wire rope, a slag prying pipe, a gate valve, a gun barrel, an air gun body, a solenoid valve, an air intake hose, an air gun support, a support frame, and a muzzle flap.

[0005] The slag-poking device in this utility model patent has the following advantages: easy operation, reduced labor intensity, reduced operational risks, and improved boiler operation stability.

[0006] However, in actual use, the slag-poking device has problems such as unsafe and inefficient operation, and has many safety hazards. For example, the air cannon body can not only poke the slag upward into the furnace, but also poke part of the slag downward out of the slag discharge pipe. This part of the slag that goes downward generally carries a small amount of unburned red slag, has a high temperature, and produces a large amount of dust, which pollutes the surrounding environment and causes great health hazards to the operators. Summary of the invention

[0007] The invention provides a high-efficiency and energy-saving pneumatic slag-pushing device for a boiler slag-dropping pipe, and aims to solve the technical problem of how to make the slag-pushing operation more efficient and energy-saving, avoid the waste of unburned red slag, and avoid the formation of large dust hazards on site.

[0008] The technical solution adopted by the present invention to solve the above-mentioned problem is: a high-efficiency and energy-saving pneumatic slag-poking device for a boiler slag-dropping pipe, the structure of which includes a slag-dropping pipe, a stop valve arranged at the lower end of the slag-dropping pipe, an expansion joint arranged on the slag-dropping pipe, and a transverse air inlet pipe arranged on the slag-dropping pipe.

[0009] A further preferred technical solution is that it also includes an arc-shaped inner lining plate arranged on the inner annular surface of the slag dropping pipe and used to block the slag-poking airflow.

[0010] A further preferred technical solution is that it also includes an air tank outlet pipe arranged on the transverse air inlet pipe, a compressed air tank arranged on the air tank outlet pipe, and a check valve arranged on the air tank outlet pipe.

[0011] A further preferred technical solution is that it also includes an air tank intake pipe arranged on the compressed air tank, and a compressed air main pipe arranged on the air tank intake pipe.

[0012] A further preferred technical solution is that it also includes a vertical rectangular opening arranged on the slag dropping pipe, and a lifting drive plate arranged on the outer ring surface of the arc-shaped inner lining plate and plugged into the vertical rectangular opening, and used to assist in slag removal by vertically moving the arc-shaped inner lining plate.

[0013] A further preferred technical solution is that it also includes a transverse screw rod disposed on the outer annular surface of the arc-shaped inner lining plate and inserted into the vertical rectangular opening, and a fastening nut disposed on the transverse screw rod and used to clamp the outer annular surface of the slag dropping pipe.

[0014] A further preferred technical solution is that it also includes a connecting hole which is arranged on the slag dropping pipe and is used for plugging the transverse air intake pipe.

[0015] A further preferred technical solution is that it also includes two positioning arc grooves which are respectively arranged on two vertical sides of the arc-shaped inner lining plate and are used to engage the transverse air intake pipe.

[0016] A further preferred technical solution is that it also includes holes and insertion rods which are respectively arranged at two side positions on the arc-shaped inner lining plate and are used to disassemble the arc-shaped inner lining plate by plugging into each other and then bending and overlapping the arc-shaped inner lining plate.

[0017] A further preferred technical solution is that it also includes a cylinder connecting hole arranged on the lifting drive plate.

[0018] The beneficial effects of the present invention include at least: First, when the pneumatic slag poking is in operation, the stop valve can be closed to allow the unburned red slag and large coke blocks to return to the furnace. This can not only clear the blocked section in the slag pipe, but also avoid the waste of heat contained in the red slag and the generation of dust. After the pneumatic slag poking operation, the stop valve can be opened again without affecting the normal slag discharge function; Second, the structure and operation of the pneumatic slag-poking machine are fully safe, the slag-dropping pipe is firmly fixed and installed, and it is not easy to be damaged by scalding. Third, the air cannon slag-blasting effect provided by the compressed air main pipe and compressed air tank is safe and convenient enough to be used on a large scale; Fourth, the arc-shaped inner lining plate can not only protect the slag falling pipe in the strong airflow, but also has the mechanical active slag poking function; Fifth, the curved inner lining plate has the dual advantages of being stable during use and convenient for assembly and disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] Figure 2 The figure is a schematic diagram of the position and shape of the arc-shaped inner lining plate in the present invention from a top view.

[0021] Figure 3 It is a schematic diagram of the position of the compressed air tank in the present invention.

[0022] Figure 4 It is a schematic diagram of the position and shape of the lifting drive plate and the transverse screw in the present invention.

[0023] Figure 5 It is a schematic diagram of the mechanical active slag-poking operation of the arc-shaped inner lining plate in the present invention.

[0024] Figure 6 This is a schematic diagram of another shape structure of the arc-shaped inner lining plate in the present invention.

[0025] Figure 7 The figure is a schematic diagram of the use of the insertion hole and the insertion rod when the arc-shaped inner lining plate in the present invention is disassembled and assembled.

[0026] In the figure, the meanings of the symbols are as follows: The furnace body a, the slag in the blocking section b, the unfolded use position of the arc-shaped inner lining plate c, and the first moving direction d when the arc-shaped inner lining plate is removed; Slag falling pipe 21; Stop valve 1, expansion joint 2, lateral air inlet pipe 3, arc-shaped lining plate 4, air tank outlet pipe 18, compressed air tank 5, check valve 6, air tank air inlet pipe 7, compressed air main pipe 8, vertical rectangular opening 9, lifting drive plate 10, lateral screw 11, fastening nut 12, connecting hole 13, arc-shaped groove for positioning 14, plug hole 15, plug rod 16, cylinder connecting hole 17. DETAILED DESCRIPTION

[0027] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0028] As attached Figure 1-Figure 7As shown, a high-efficiency and energy-saving pneumatic slag-poking device for a boiler slag-dropping pipe comprises a slag-dropping pipe 21, a stop valve 1 arranged at the lower end of the slag-dropping pipe 21, an expansion joint 2 arranged on the slag-dropping pipe 21, and a transverse air inlet pipe 3 arranged on the slag-dropping pipe 21.

[0029] In this embodiment, the slag dropping pipe 21 is vertically arranged, the upper end is butted with the slag discharge port on the furnace body a, and is welded and fixed, and is divided into two parts, and the expansion joint 2 is installed between the two sections of the pipe body. At this point, the furnace body a is fixedly installed, and the lower pipe body of the slag dropping pipe 21, together with the stop valve 1 and the horizontal air inlet pipe 3, are also fixedly installed. After being combined with the expansion joint 2, the pneumatic slag-poking device has at least the following two advantages: First, each part is fixedly installed and firmly installed, so it can be used stably; Second, the thermal expansion and contraction of the furnace body a will not affect the installation stability of the lower pipe body of the slag dropping pipe 21, the stop valve 1, and the transverse air intake pipe 3.

[0030] Among them, the material of the slag drop pipe 21 and the lateral air intake pipe 3 is a carbon steel pipe with outstanding heat resistance. The main function of the latter is to prevent the unburned red slag from touching and burning the external compressed air pipeline, because the commonly used pipe material for the compressed air pipeline is a metal braided pipe, which has relatively low heat resistance and is not as good as the above-mentioned carbon steel pipe.

[0031] In addition, the expansion joint 2 is a commercially available product, which has sufficient and appropriate expansion performance in the vertical length direction, but its radial dimension is not easy to change, at least the impact force of compressed air will not cause it to expand in the radial direction. It is also made of steel with outstanding heat resistance. Slag may accumulate in a small amount in its fold gaps, but it does not affect the overall slag discharge effect and slag poking function.

[0032] Finally, the method of using the stop valve 1 is generally as follows: First, during the pneumatic slag-poking operation, the stop valve 1 is generally in a closed state. After the compressed air enters the slag-dropping pipe 21, it finally enters the furnace body a. At this time, the blocked slag is blown away and loosened. If there is unburned red slag in it, it will return to the furnace body a, making full use of its heat, while solving the slag blockage problem and the red slag heat waste problem. Therefore, accordingly, the position of the transverse air inlet pipe 3 on the slag-dropping pipe 21 needs to be appropriately lower; Second, after the pneumatic slag-poking operation, the stop valve 1 is always open or opened and closed regularly to perform normal slag discharge operation. At this time, the problem of a small amount of discharge of unburned red slag and the slight dust problem under the slag-dropping pipe 21 are all normal phenomena and will not cause significant harm to the surrounding environment and operators; Third, during the pneumatic slag poking operation, the stop valve 1 can also be in an open state. At this time, in order to ensure sufficient safety, the compressed air intensity can be adjusted to a relatively low level. Therefore, this method is suitable for situations where the degree of slag blockage is relatively light.

[0033] The pneumatic slag-moving device further comprises an arc-shaped inner lining plate 4 which is arranged on the inner annular surface of the slag-dropping pipe 21 and is used for blocking the slag-moving airflow.

[0034] In this embodiment, the material of the arc-shaped inner lining plate 4 is the same as that of the slag falling pipe 21. The central angle of the cross-sectional shape of the former can be greater than or less than 180°. Its main functions are: A thickened structure is formed on the inner annular surface of the slag dropping pipe 21 in the area laterally opposite to the transverse air inlet pipe 3, so that the slag dropping pipe 21 at this location is not easily broken by high-intensity airflow, thereby avoiding the impact to form a hole.

[0035] On the other hand, the arc-shaped inner lining plate 4 is installed by attachment, which has the advantage of reserving a thickened section at the above position directly, that the airflow blocking effect can be always effective by disassembly and replacement. Otherwise, after the thickened section is completely worn by impact, the slag dropping pipe 21 still needs to be replaced together, which is very time-consuming, labor-intensive and wasteful of materials.

[0036] The arc-shaped inner lining plate 4 has appropriate elasticity and tends to expand on the inner annular surface of the slag dropping pipe 21, so that it can press the inner annular surface of the slag dropping pipe 21, making it difficult for itself to fall. The shape after being spread out is rectangular, and its length and width are relatively large, at least ensuring that the lateral projection of the lateral air intake pipe 3 falls entirely on it, and its thickness is 2-5 mm, or the thickness of the slag dropping pipe 21 is the same.

[0037] The pneumatic slag-moving device further comprises an air tank outlet pipe 18 arranged on the transverse air inlet pipe 3 , a compressed air tank 5 arranged on the air tank outlet pipe 18 , and a check valve 6 arranged on the air tank outlet pipe 18 .

[0038] In this embodiment, the material of the air tank outlet pipe 18 is the above-mentioned metal braided tube, and the compressed air tank 5 is a commercially available product with an internal pressure ≥ 0.3MPa. It can be provided with a pressurizing function or not, and finally a high-pressure airflow can be discharged at the transverse air inlet pipe 3.

[0039] The check valve 6 is also a commercially available product, and its function is also existing, which is to prevent the airflow from returning to the compressed air tank 5. Correspondingly, the check valve 6 can also be the switch of the pneumatic slag-pushing device. After it is turned on, the high-pressure airflow can disperse the blocked slag, achieving the effect of pneumatic slag-pushing.

[0040] The pneumatic slag-moving device further comprises an air tank air inlet pipe 7 arranged on the compressed air tank 5 , and a compressed air main pipe 8 arranged on the air tank air inlet pipe 7 .

[0041] In this embodiment, the compressed air main pipe 8 is connected to a larger compressed air container, or to a compressed air pump, to ensure that all boilers in the workshop can perform pneumatic slag removal operations as needed, which is very efficient and convenient.

[0042] Among them, existing common valves can be further provided on the air tank air inlet pipe 7 and / or the compressed air main pipe 8 as needed to make the flow of compressed air safer and more efficient.

[0043] The pneumatic slag-moving device also includes a vertical rectangular opening 9 arranged on the slag-dropping pipe 21, and a lifting drive plate 10 arranged on the outer ring surface of the arc-shaped inner lining plate 4 and plugged into the vertical rectangular opening 9, and used to assist in slag-moving by vertically moving the arc-shaped inner lining plate 4.

[0044] In this embodiment, the arc-shaped lining plate 4 is combined with the vertical rectangular opening 9 and the lifting drive plate 10, so that it has an important second function, namely: mechanical active slag poking operation.

[0045] At this time, part b of the blocked slag is stuck on the arc-shaped inner lining plate 4, or is slightly higher than the arc-shaped inner lining plate 4. The lifting drive plate 10 drives the arc-shaped inner lining plate 4 to perform multiple lifting operations, which can assist pneumatic slag poking and achieve a more efficient slag poking effect.

[0046] It should be noted that: First, when the lifting drive plate 10 is at the highest position or the lowest position on the vertical rectangular opening 9, the arc-shaped inner lining plate 4 always completely covers the vertical rectangular opening 9, and its own shape remains unchanged and always adheres to the inner annular surface of the slag falling pipe 21, without obvious air permeability; Second, even if there is a small amount of air permeability at the vertical rectangular opening 9, the strength of the pneumatic slag poking is indeed reduced, but compared with the gain effect brought about by the mechanical slag poking operation during the lifting and lowering of the arc-shaped lining plate 4, this is completely negligible. The advantages of opening the vertical rectangular opening 9 far outweigh the associated disadvantages.

[0047] The pneumatic slag-moving device also includes a transverse screw 11 arranged on the outer annular surface of the arc-shaped inner lining plate 4 and inserted into the vertical rectangular opening 9, and a fastening nut 12 arranged on the transverse screw 11 and used to clamp the outer annular surface of the slag-dropping pipe 21.

[0048] In this embodiment, when the arc-shaped inner lining plate 4 does not need to be lifted or lowered by itself and the slag is mechanically poked out, the fastening nut 12 greatly presses the outer annular surface of the slag dropping pipe 21 to ensure sufficient sealing performance between the arc-shaped inner lining plate 4 and the inner annular surface of the slag dropping pipe 21.

[0049] When the arc-shaped inner lining plate 4 is raised or lowered to poke out slag, the fastening nut 12 is only slightly loosened to allow the arc-shaped inner lining plate 4 to be raised or lowered. Still, no obvious gap can be left between the arc-shaped inner lining plate 4 and the slag dropping pipe 21. Otherwise, the gap will not only leak air, but also emit slag dust, which is both inefficient and unsafe.

[0050] In addition, during the entire installation and lifting process of the arc-shaped inner lining plate 4, the lifting drive plate 10 and 1-2 transverse screws 11 always fit the vertical edge of the vertical rectangular opening 9 to prevent the arc-shaped inner lining plate 4 from tilting.

[0051] The pneumatic slag-pushing device further comprises a connecting hole 13 which is arranged on the slag-dropping pipe 21 and is used for plugging the transverse air inlet pipe 3 .

[0052] In this embodiment, the transverse air intake pipe 3 is first plugged into the connecting hole 13, and then a complete circle is welded between the former and the slag dropping pipe 21, so as to ensure that the transverse air intake pipe 3 has a relatively high installation stability.

[0053] The pneumatic slag-moving device also includes two positioning arc-shaped grooves 14 which are respectively arranged on two vertical sides of the arc-shaped inner lining plate 4 and are used to engage with the transverse air intake pipe 3.

[0054] In this embodiment, the positioning arc groove 14 is used in conjunction with the arc-shaped inner lining plate 4 with a cross-sectional center angle greater than 180°.

[0055] The circular diameter corresponding to the arcuate side of the positioning arcuate groove 14 is slightly larger than the outer diameter of the transverse air intake pipe 3, so that the two can be matched and engaged, thereby providing a unique and fixed engaging position for the arcuate inner lining plate 4, ensuring that the arcuate inner lining plate 4 is not easily deflected and has a unique fixed position.

[0056] During the process of the arc-shaped inner lining plate 4 rising and falling and actively poking slag, it itself needs to be deformed appropriately, so that the transverse air intake pipe 3 first slides out of the positioning arc-shaped groove 14 relatively, and then relatively snaps into the positioning arc-shaped groove 14. This is one of the reasons why the arc-shaped inner lining plate 4 itself needs appropriate elasticity.

[0057] Correspondingly, the setting of the positioning arc groove 14 also makes the driving and lifting action of the lifting drive plate 10 simpler and more convenient, without setting the lifting amplitude memory function. The transverse air intake pipe 3 is relatively inserted into the positioning arc groove 14, for example, a "click" sound is emitted, which is the correct end point of the arc lining plate 4 descending and resetting after actively poking the slag.

[0058] The pneumatic slag-moving device also includes insertion holes 15 and insertion rods 16 which are respectively arranged at two side positions on the arc-shaped inner lining plate 4 and are used to disassemble the arc-shaped inner lining plate 4 by plugging into each other and then bending and overlapping the arc-shaped inner lining plate 4.

[0059] In this embodiment, the insertion hole 15 and the insertion rod 16 are only used when the arc-shaped inner lining plate 4 is disassembled or assembled.

[0060] As attached Figure 6 As shown, at this time, the lateral bending amplitude of the arc-shaped inner lining plate 4 is much larger than that in its normal use state, and is not necessarily a circular contour. At this time, the equivalent diameter is much smaller than the slag dropping pipe 21. Therefore, the arc-shaped inner lining plate 4 can be disassembled and replaced together with the lifting drive plate 10 in the slag dropping pipe 21.

[0061] The insertion hole 15 and the insertion rod 16 are connected to ensure that the significantly bent and partially overlapped folded state will not be accidentally opened, at least not accidentally opened during the disassembly and assembly of the arc-shaped inner lining plate 4. Otherwise, the arc-shaped inner lining plate 4 is attached to the slag dropping pipe 21 and is difficult to disassemble and assemble.

[0062] Correspondingly, the arc-shaped lining plate 4 is disassembled as follows: first, it is greatly bent and partially overlapped, and then the insertion rod 16 is inserted into the insertion hole 15, and then along the first moving direction d when the arc-shaped lining plate is disassembled, the lifting drive plate 10 is allowed to leave the vertical rectangular opening 9, and finally it is taken out downwards, and vice versa, it is installed, and the operation method is the same.

[0063] The number of the jacks 15 and the number of the rods 16 are both two, the two jacks 15 are arranged at one upper and one lower position of one of the positioning arc grooves 14, and the two rods 16 are arranged at one upper and one lower position of the other positioning arc groove 14. For details, please refer to the attached Figure 6 The plug-in dimensions of the plug hole 15 and the plug rod 16 do not have to be perfectly matched.

[0064] The pneumatic slag-moving device further includes a cylinder connecting hole 17 arranged on the lifting drive plate 10 .

[0065] In this embodiment, the meaning of the above-mentioned words "high efficiency and energy saving" at least includes: Compared with manual slag poking operation, pneumatic slag poking operation has outstanding high efficiency. Compared with the existing common pneumatic slag-poking method, the above-mentioned pneumatic slag-poking operation has the advantages of higher stability, higher efficiency and improved safety; When the pneumatic slag-poking operation is in progress, the stop valve 1 can be closed, so that the unburned red slag can return to the furnace body a for further combustion, which is very efficient and energy-saving; The auxiliary arc-shaped lining plate 4 has a lifting and lowering slag-pushing effect, which can further improve the slag-pushing efficiency.

[0066] Finally, the cylinder installed on the cylinder connecting hole 17 is installed on the same fixing frame together with the lower tube body of the slag dropping pipe 21, so as to ensure that the lifting and lowering action of the arc-shaped inner lining plate 4 is effective and convenient.

[0067] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present invention. These are all non-creative modifications and are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A high-efficiency and energy-saving pneumatic slag-poking device for a boiler slag-poking pipe, the structure comprising a slag-poking pipe (21), characterized in that: It also comprises a stop valve (1) arranged at the lower end of the slag dropping pipe (21), an expansion joint (2) arranged on the slag dropping pipe (21), and a transverse air inlet pipe (3) arranged on the slag dropping pipe (21).

2. The high-efficiency and energy-saving pneumatic slag-poking device for a boiler slag-dropping pipe according to claim 1 is characterized in that: It also includes an arc-shaped inner lining plate (4) which is arranged on the inner annular surface of the slag dropping pipe (21) and is used to block the slag-poking airflow.

3. The high-efficiency and energy-saving pneumatic slag-poking device for a boiler slag-dropping pipe according to claim 1 is characterized in that: It also includes an air tank outlet pipe (18) arranged on the transverse air inlet pipe (3), a compressed air tank (5) arranged on the air tank outlet pipe (18), and a check valve (6) arranged on the air tank outlet pipe (18).

4. The high-efficiency and energy-saving pneumatic slag-poking device for a boiler slag-dropping pipe according to claim 3 is characterized in that: It also includes an air tank air intake pipe (7) arranged on the compressed air tank (5), and a compressed air main pipe (8) arranged on the air tank air intake pipe (7).

5. The high-efficiency and energy-saving pneumatic slag-moving device for a boiler slag-moving pipe according to claim 2 is characterized in that: It also includes a vertical rectangular opening (9) provided on the slag dropping pipe (21), and a lifting drive plate (10) provided on the outer annular surface of the arc-shaped inner lining plate (4), plugged into the vertical rectangular opening (9), and used to assist in slag removal by vertically moving the arc-shaped inner lining plate (4).

6. The high-efficiency and energy-saving pneumatic slag-moving device for a boiler slag-moving pipe according to claim 5, characterized in that: It also includes a transverse screw (11) disposed on the outer annular surface of the arc-shaped inner lining plate (4) and inserted into the vertical rectangular opening (9), and a fastening nut (12) disposed on the transverse screw (11) and used to clamp the outer annular surface of the slag dropping pipe (21).

7. The high-efficiency and energy-saving pneumatic slag-moving device for a boiler slag-moving pipe according to claim 5, characterized in that: It also includes a connection hole (13) arranged on the slag dropping pipe (21) and used for plugging into the transverse air intake pipe (3).

8. The high-efficiency and energy-saving pneumatic slag-moving device for a boiler slag-moving pipe according to claim 7, characterized in that: It also includes two positioning arc grooves (14) which are respectively arranged on two vertical sides of the arc-shaped inner lining plate (4) and are used to engage with the transverse air intake pipe (3).

9. The high-efficiency and energy-saving pneumatic slag-moving device for a boiler slag-dropping pipe according to claim 5, characterized in that: It also includes insertion holes (15) and insertion rods (16) which are respectively arranged at two side positions on the arc-shaped inner lining plate (4) and are used for disassembling the arc-shaped inner lining plate (4) by means of mutual insertion and bending to overlap the arc-shaped inner lining plate (4).

10. The high-efficiency and energy-saving pneumatic slag-moving device for a boiler slag-moving pipe according to claim 5, characterized in that: It also includes a cylinder connection hole (17) arranged on the lifting drive plate (10).

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