阅读说明：本技术 一种固定床脱硫装置 (Fixed bed desulphurization unit ) 是由 张作帅 于 2021-08-25 设计创作，主要内容包括：本发明属于脱硫装置技术领域,具体公开一种固定床脱硫装置,包括用于固定床脱硫反应的吸收仓,所述吸收仓底部连接有用于引入烟气的烟道机构,吸收仓顶部连接有用于填充吸收仓的吸收剂供给装置。通过将进气烟道设置于吸收仓底部,使得烟气由下至上完全穿过吸收仓,提高烟气与吸收剂的接触时长和接触范围,提高吸收剂的利用率；通过在吸收仓顶部外周设置多个填料口,分散吸收剂的落料位置及单口落料量,从而降低吸收剂落料时对底部支撑网的冲击力,延长支撑网的使用寿命,同时提高吸收剂填料的均匀性,提高吸收剂的吸收率。(The invention belongs to the technical field of desulfurization devices, and particularly discloses a fixed bed desulfurization device which comprises an absorption bin for fixed bed desulfurization reaction, wherein the bottom of the absorption bin is connected with a flue mechanism for introducing flue gas, and the top of the absorption bin is connected with an absorbent supply device for filling the absorption bin. The gas inlet flue is arranged at the bottom of the absorption bin, so that the flue gas completely passes through the absorption bin from bottom to top, the contact time and contact range of the flue gas and the absorbent are prolonged, and the utilization rate of the absorbent is improved; through set up a plurality of filler openings in absorption storehouse top periphery, the blanking position and the single mouthful blanking volume of dispersion absorbent to the impact force to bottom sprag net when reducing the absorbent blanking, the life of extension sprag net improves the homogeneity that the absorbent packed simultaneously, improves the absorption rate of absorbent.)

1. The utility model provides a fixed bed desulphurization unit, its characterized in that, is including the absorption storehouse that is used for fixed bed desulfurization reaction, absorption storehouse bottom is connected with the flue mechanism that is used for introducing the flue gas, and absorption storehouse top is connected with the absorbent feeding device who is used for filling the absorption storehouse, flue mechanism is including connecting the receiver tube in fixed bed reaction tower bottom and stretching into the inside flue that admits air of receiver tube from the receiver tube pipe wall, the flue that admits air's outlet end is fixed with first fender material spare, be fixed with second fender material spare on the flue outer wall that admits air, first fender material spare height is higher than second fender material spare height.

2. The fixed bed desulfurization device according to claim 1, wherein the absorbent supply device comprises a plurality of filling openings arranged at the top of the absorption bin and a feeding pipe for supplying the absorbent to the filling openings, the plurality of filling openings are uniformly distributed on the periphery of the top of the fixed bed reaction tower, a filling pipe is connected to each filling opening, and the plurality of filling pipes are respectively communicated with the feeding pipe.

3. A fixed bed desulfurization unit according to claim 2, characterized in that a buffer tank for buffering the absorbent is further provided between the filler pipe and the feed pipe, the feed pipe is communicated with the top of the buffer tank, and the filler pipe is communicated with the bottom of the buffer tank.

4. The fixed bed desulfurization device according to claim 3, wherein the buffer tank comprises a tank body for storing materials and a support column for supporting the tank body, two ends of the support column are respectively connected with the bottom of the buffer tank and the top of the fixed bed reaction tower, and the tank body is provided with a feed hole for connecting a feed pipe and a material distribution hole for connecting a filler pipe.

5. A fixed bed desulfurization unit according to claim 4, characterized in that a conical disk for dispersing the absorbent is provided at the bottom inside the tank body, and the conical disk is fixedly connected with the tank body.

6. The fixed bed desulfurization device according to claim 1, wherein the absorption bin comprises two sets of first absorption bin and second absorption bin which are connected with each other through a pipeline, the first absorption bin comprises a first bin body for containing an absorbent, a first flue gas inlet arranged at the bottom of the first bin body for air intake, a first flue gas outlet arranged at the top of the first bin body for exhaust, and a first return port arranged below the first bin body for return repeated purification, the first flue gas outlet and the first return port are connected through a first return pipeline, a first exhaust pipe for exhaust is further arranged on the first return pipeline, and a first three-way valve for controlling the gas flow direction is arranged at the connection of the first exhaust pipe and the first return pipeline.

7. The fixed bed desulfurization device according to claim 6, wherein the first reflux pipeline comprises a first gas inlet section connected to the first reflux port, a first gas exhaust section connected to the first flue gas outlet, and a first reflux section having two ends respectively connected to the first gas inlet section and the first gas exhaust section, and the first reflux section is provided with a first pneumatic circulation pump for controlling the reflux speed of the gas flow.

8. A fixed bed desulfurization unit in accordance with claim 7, wherein said first gas inlet section is fixedly connected to the first return port in an inclined downward direction, and said first gas outlet section is fixedly connected to the first flue gas outlet in an inclined downward direction.

9. The fixed bed desulfurization apparatus according to claim 7, wherein the second absorption bin structure is identical to the first absorption bin structure.

10. A fixed bed desulfurization apparatus according to claim 1, wherein said receiver pipe is a funnel pipe having a large upper portion and a small lower portion.

Technical Field

The invention belongs to the technical field of desulfurization devices, and particularly relates to a fixed bed desulfurization device.

Background

Traditional flue gas processing apparatus sets up the middle part at fixed bed reaction tower for the flue entry usually, the bottom of fixed bed reaction tower sets up the receiver tube, the top of fixed bed reaction tower sets up the exhanst gas outlet, but absorbent material is put in owing to the needs top to this kind of mode, bottom discharge absorbent material, the side is advanced to discharge fume, area is great, and the side flue gas can lead to flue gas and fixed bed reaction insufficient simultaneously, can appear often because the flue gas flows along fixed path, lead to being located the material in the fixed bed reaction tower and often hardly accomplishing the flue gas desulfurization reaction, lead to the waste of desulfurizer, reduce desulfurization efficiency.

Accordingly, further developments and improvements are still needed in the art.

Disclosure of Invention

In order to solve the above problems, a fixed bed desulfurization apparatus has been proposed. The invention provides the following technical scheme:

the utility model provides a fixed bed desulphurization unit, is including the absorption storehouse that is used for fixed bed desulfurization reaction, absorption storehouse bottom is connected with the flue mechanism that is used for introducing the flue gas, and absorption storehouse top is connected with the absorbent feeding device who is used for filling the absorption storehouse, flue mechanism is including connecting the receiver tube in fixed bed reaction tower bottom and stretching into the inside flue of admitting air of receiver tube from the receiver tube pipe wall, the end of giving vent to anger of flue of admitting air is fixed with first fender material spare, be fixed with second fender material spare on the flue outer wall of admitting air, first fender material spare height is higher than second fender material spare height.

Furthermore, the absorbent feeding device comprises a plurality of filling openings arranged at the top of the absorption bin and a feeding pipe used for feeding absorbent to the filling openings, the filling openings are uniformly distributed on the periphery of the top of the fixed bed reaction tower, a filling pipe is connected to each filling opening, and the filling pipes are communicated with the feeding pipe respectively.

Furthermore, a buffer tank for buffering the absorbent is further arranged between the filling pipe and the feeding pipe, the feeding pipe is communicated with the top of the buffer tank, and the filling pipe is communicated with the bottom of the buffer tank.

Furthermore, the buffer tank comprises a tank body for storing materials and a support column for supporting the tank body, the two ends of the support column are respectively connected with the bottom of the buffer tank and the top of the fixed bed reaction tower, and the tank body is provided with a feed hole for connecting a feed pipe and a material distributing hole for connecting a filler pipe.

Furthermore, a conical disc for dispersing the absorbent is arranged at the bottom in the tank body, and the conical disc is fixedly connected with the tank body.

Furthermore, the absorption bin comprises two sets of first absorption bin and second absorption bin which are connected with each other through a pipeline, the first absorption bin comprises a first bin body for containing an absorbent, a first flue gas inlet arranged at the bottom of the first bin body and used for air inlet, a first flue gas outlet arranged at the top of the first bin body and used for exhaust, and a first backflow port arranged below the first bin body and used for backflow repeated purification, the first flue gas outlet is connected with the first backflow port through a first backflow pipeline, a first exhaust pipe used for exhaust is further arranged on the first backflow pipeline, and a first three-way valve used for controlling the flow direction of gas is arranged at the joint of the first exhaust pipe and the first backflow pipeline.

Further, first return line is including connecting in the first section of admitting air of first return opening department, connecting in the first exhaust section of first exhanst gas outlet department and the first return section that first section of admitting air and first exhaust section are connected respectively at both ends, be provided with the first pneumatic circulation pump that is used for controlling air current backward flow speed on the first return section.

Further, first section of admitting air slope fixed connection in first return opening department downwards, first section of exhausting slope fixed connection in first flue gas exit downwards.

Further, the second absorption bin structure is the same as the first absorption bin structure.

Furthermore, the receiving pipe is a hopper-shaped pipe with a thick upper part and a thin lower part.

Has the advantages that:

1. the gas inlet flue is arranged at the bottom of the fixed bed reaction tower, so that the flue gas completely passes through the fixed bed reaction tower from bottom to top, the contact time and contact range of the flue gas and the absorbent are prolonged, and the utilization rate of the absorbent is improved;

2. the air inlet flue is obliquely inserted into the receiving pipe, so that the influence on the normal collection of residues by the receiving pipe is avoided, the residues are prevented from entering the air inlet flue by the first material blocking part arranged at the end part of the air inlet flue, the fallen residues are prevented from being influenced by smoke by the second material blocking part, and meanwhile, a certain guiding effect is realized on the smoke, so that the smoke is prevented from overflowing through the receiving pipe;

3. the periphery of the top of the absorption bin is provided with the plurality of filling ports, so that the blanking position and the blanking amount of the absorbent are dispersed, the impact force on the bottom supporting net during blanking of the absorbent is reduced, the service life of the supporting net is prolonged, the uniformity of the absorbent filling is improved, and the absorption rate of the absorbent is improved;

4. by arranging the buffer tank between the filling pipe and the feeding pipe, the dispersion uniformity of the absorbent is further improved, and meanwhile, a certain normal-pressure buffer space is provided for the material distributing hole, so that the phenomenon of accumulation and blockage of the absorbent at the material distributing position is avoided;

5. through being provided with return line in absorption storehouse side, realize the circulation flow of flue gas in absorbing the storehouse to make the absorbent can carry out abundant absorption to the flue gas, and flue gas inlet and backward flow mouth orientation are inconsistent, make the air current can not be followed same air current route all the time and absorbed by the absorbent, and then improve the utilization ratio of absorbent.

Drawings

FIG. 1 is a schematic view of a fixed bed desulfurization apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic view of the internal cross-sectional structure of the flue means in an embodiment of the present invention;

FIG. 3 is a schematic structural view of a flue mechanism in an installation state in an embodiment of the present invention;

FIG. 4 is a schematic view showing the installation structure of the absorbent supplying apparatus in the embodiment of the present invention;

FIG. 5 is a schematic view of a top-down mounting structure of an absorbent feeding apparatus according to an embodiment of the present invention;

FIG. 6 is a schematic sectional view taken along line A-A of FIG. 5 in accordance with the present invention;

FIG. 7 is a schematic view of an absorbent bin assembly according to an embodiment of the present invention;

in the drawings: 100. a feed pipe; 200. a buffer tank; 210. a tank body; 211. a feed port; 212. a material distributing hole; 213. a conical disc; 220. a support pillar; 300. a filler tube; 400. an absorption bin; 410. a filling opening; 411. a first bin body; 412. a first flue gas inlet; 413. a first flue gas outlet; 414. a first return port; 415. a first return line; 416. a first three-way valve; 417. a first exhaust pipe; 418. a first pneumatic circulation pump; 421. a second bin body; 422. a second flue gas inlet; 423. a second flue gas outlet; 424. a second return port; 425. a second return line; 426. a second three-way valve; 427. a second exhaust pipe; 428. a second pneumatic circulation pump; 500. a flue mechanism; 510. a receiving tube; 520. an air intake flue; 521. an air inlet pipe; 522. an air outlet pipe; 530. a first material blocking part; 531. connecting columns; 540. and a second material blocking part.

Detailed Description

In order to make the technical solutions of the present invention better understood, the following description of the technical solutions of the present invention with reference to the accompanying drawings of the present invention is made clearly and completely, and other similar embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.

As shown in fig. 1 to 7, a fixed bed desulfurization device includes an absorption bin 400 for fixed bed desulfurization reaction, a flue mechanism 500 for introducing flue gas is connected to the bottom of the absorption bin 400, an absorbent supply device for filling the absorption bin 400 is connected to the top of the absorption bin 400, the flue mechanism 500 includes a receiving pipe 510 connected to the bottom of the fixed bed reaction tower, and an air inlet flue 520 extending into the receiving pipe 510 from the pipe wall of the receiving pipe 510, a first material blocking member 530 is fixed to the air outlet end of the air inlet flue 520, a second material blocking member 540 is fixed to the outer wall of the air inlet flue 520, and the first material blocking member 530 is higher than the second material blocking member 540. The air inlet flue 520 is arranged at the bottom of the absorption bin 400, so that the flue gas completely passes through the absorption bin 400 from bottom to top, the contact time and contact range of the flue gas and the absorbent are prolonged, and the utilization rate of the absorbent is improved; through in inserting the receiving tube 510 with the flue 520 slope that admits air, avoid influencing the normal collection of receiving tube 510 to the residue, through in the first fender material piece 530 that admits air flue 520 tip set up avoids the residue to get into the flue 520 that admits air, avoid the residue that the flue gas influence has fallen through setting up second fender material piece 540, play certain guide effect to the flue gas simultaneously, avoid the flue gas to spill over through receiving tube 510.

Further, the absorbent feeding device comprises a plurality of filling openings 410 arranged at the top of the absorption bin 400 and a feeding pipe 100 used for feeding absorbent to the filling openings 410, the plurality of filling openings 410 are uniformly distributed on the periphery of the top of the fixed bed reaction tower, a filling pipe 300 is connected to each filling opening 410, and the plurality of filling pipes 300 are respectively communicated with the feeding pipe 100. Through set up a plurality of filler openings 410 in absorption storehouse 400 top periphery, the blanking position and the single mouthful blanking volume of dispersion absorbent to the impact force to the bottom sprag net when reducing the absorbent blanking, the life of extension sprag net improves the homogeneity that the absorbent packed simultaneously, improves the absorption rate of absorbent.

Further, a buffer tank 200 for buffering the absorbent is arranged between the filling pipe 300 and the feeding pipe 100, the feeding pipe 100 is communicated with the top of the buffer tank 200, and the filling pipe 300 is communicated with the bottom of the buffer tank 200. By arranging the buffer tank 200 between the filling pipe 300 and the feeding pipe 100, the dispersion uniformity of the absorbent is further improved, and meanwhile, a certain normal-pressure buffer space is provided for the material distribution holes 212, so that the phenomenon of stacking and blocking of the absorbent at the material distribution position is avoided.

Further, the buffer tank 200 comprises a tank body 210 for storing materials and a supporting column 220 for supporting the tank body 210, two ends of the supporting column 220 are respectively connected with the bottom of the buffer tank 200 and the top of the fixed bed reaction tower, and the tank body 210 is provided with a feeding hole 211 for connecting the feeding pipe 100 and a distributing hole 212 for connecting the packing pipe 300. The support column 220 is made of a light material, and is mainly used for limiting the fixed distance between the buffer tank 200 and the absorption bin 400, so that the absorption bin 400 is prevented from being loaded with large weight, and meanwhile, the support column 220 plays a role in auxiliary support, so that the filler pipe 300 is prevented from being bent and deformed due to overlarge pressure.

Further, a conical disc 213 for dispersing the absorbent is arranged at the bottom in the tank 210, and the conical disc 213 is fixedly connected with the tank 210. The axes of the feeding hole 211 and the conical disc 213 are located on the same straight line, so as to ensure that the discharged material can be uniformly dispersed to the center of the conical disc 213 as much as possible, and then uniformly dispersed to the surrounding material distributing holes 212 along the slope of the conical disc 213. Further, the height of the conical disc 213 is less than half of the height of the can 210. Avoid the too high absorbent falling speed that leads to of conical disk 213 height to make the equipartition effect invalid. Further, the feeding hole 211 is disposed at the axis of the top of the tank 210, and the distributing hole 212 is disposed along the circumferential direction of the bottom of the tank 210. The material distributing holes 212 are tangentially arranged along the circumferential direction of the inner wall of the bottom of the tank body 210, so that a material storage platform is prevented from being left between the material distributing holes 212 and the inner wall as much as possible, and the absorbent is prevented from being retained and deteriorated in the buffer tank for a long time. Further, the bottom surface of the conical disc 213 coincides with an inscribed circle formed by the material distribution holes 212. The absorbent directly falls into the material distributing hole 212 below after falling into the conical disc 213, and a material storage platform is prevented from remaining between the material distributing hole 212 and the conical disc 213 as far as possible, so that the absorbent is retained and deteriorated in the buffer tank for a long time. Further, a closing valve for cutting off the communication relationship is arranged at the joint of the filler pipe 300 and the top of the absorption bin 400. The sealing between the absorption bin 400 and the filler pipe 300 is realized by arranging the sealing valve, the smoke is prevented from entering the filler pipe 300 or the feeding pipe 100 to pollute the absorbent, meanwhile, the sealing valve can also control the filling speed of the absorbent, the filling position and the blanking speed are controlled by opening and closing the sealing valve at a specific position, the supporting net can be protected by reducing the filling speed when the filling is started, and after the absorbent with a certain thickness is arranged on the supporting net, the seasoning efficiency is improved by opening all the sealing valves to improve the filling speed. Further, the filling openings 410 are symmetrically arranged in even number around the periphery of the top of the absorption bin 400. The even number of the filling openings 410 are symmetrically arranged, so that the uniformity of the filling can be ensured when the feeding speed of the absorbent is controlled. Further, eight filling ports 410 are provided, and eight filling pipes 300 are provided corresponding to the eight filling ports 410. The eight filling openings 410 can comprehensively cover the filling positions of the absorption bin 400, ensure the uniformity of the filling and conveniently control the flow rate.

Further, the absorption bin 400 includes two sets of first absorption bin and second absorption bin which are connected to each other through a pipeline, the first absorption bin includes a first bin body 411 for containing an absorbent, a first flue gas inlet 412 arranged at the bottom of the first bin body 411 for air intake, a first flue gas outlet 413 arranged at the top of the first bin body 411 for exhaust, and a first return port 414 arranged below the first bin body 411 for return and repeated purification, the first flue gas outlet 413 is connected with the first return port 414 through a first return pipeline 415, the first return pipeline 415 is further provided with a first exhaust pipe 417 for exhaust, and a first three-way valve 416 for controlling a gas flow direction is arranged at a connection position of the first exhaust pipe 417 and the first return pipeline 415. Through being provided with return line in absorption storehouse 400 side, realize the circulation flow of flue gas in absorption storehouse 400 to make the absorbent can carry out abundant absorption to the flue gas, and flue gas inlet and backward flow mouth orientation are inconsistent, make the air current can not be followed same air current route all the time and be absorbed by the absorbent, and then improve the utilization ratio of absorbent. By arranging the three-way valve, the airflow can only pass through two pipelines at each time, and can not pass through the third pipeline, the flow path of the airflow is conveniently controlled, and the airflow is controlled to move along the circulating path or be discharged out of the absorption bin 400. Through setting up two continuous absorption storehouses 400, improve absorption efficiency, can be according to opening of flue gas volumn selectivity and use one or two storehouse bodies carry out harmful substance's absorption, practicality and suitability are better, and the selectivity is opened conveniently and is enlarged production and energy saving.

Further, the first backflow pipeline 415 includes a first air inlet section connected to the first backflow port 414, a first exhaust section connected to the first flue gas outlet 413, and a first backflow section having two ends respectively connected to the first air inlet section and the first exhaust section, and the first backflow section is provided with a first pneumatic circulation pump 418 for controlling the airflow backflow speed. Preferably, support nets for isolating the absorption bin 400 from the pipeline are arranged at the first flue gas inlet 412, the first flue gas outlet 413 and the first return port 414, and at the second flue gas inlet 422, the second flue gas outlet 423 and the second return port 424, and the diameter of the support net is smaller than the particle size of the absorbent particles. The upper end and the lower end of the return pipeline are obliquely and downwards arranged, so that the phenomenon that the absorbent enters the pipeline after passing through the filter screen and is blocked is reduced as much as possible. After the air inlet pipe 521 and the exhaust pipeline are closed, the smoke is circulated by the aid of the pneumatic circulating pump, so that the smoke continuously circularly flows from bottom to top, and the reaction process is ensured to be sufficient.

Further, the first air inlet section is fixedly connected to the first return port 414 obliquely downward, and the first exhaust section is fixedly connected to the first flue gas outlet 413 obliquely downward.

Further, the second absorption bin structure is the same as the first absorption bin structure. The second absorption bin comprises a second bin body 421 for containing an absorbent, a second flue gas inlet 422 arranged at the bottom of the second bin body 421 for allowing air to enter, a second flue gas outlet 423 arranged at the top of the second bin body 421 for exhausting, and a second return port 424 arranged below the second bin body 421 for returning and repeatedly purifying, the second flue gas outlet 423 is connected with the second return port 424 through a second return pipeline 425, a second exhaust pipe 427 for exhausting is further arranged on the second return pipeline 425, and a second three-way valve 426 for controlling the flow direction of the gas is arranged at the joint of the second exhaust pipe 427 and the second return pipeline 425. As a preferable solution of the present technical solution, the second return pipeline 425 includes a second air inlet section connected to the second return port 424, a second air outlet section connected to the second flue gas outlet 423, and a second return section having two ends respectively connected to the second air inlet section and the second air outlet section, and the second return section is provided with a second pneumatic circulation pump 428 for controlling the air flow return speed. In a preferred embodiment of the present invention, the first exhaust pipe 417 is communicated with the second return section, and the second pneumatic circulation pump 428 is disposed below the first exhaust pipe 417. As a preferable scheme of the present technical solution, sealing valves for opening and closing the openings are disposed at the second flue gas inlet 422, the second flue gas outlet 423 and the second backflow port 424. As a preferable scheme of the present invention, sealing valves for opening and closing the openings are disposed at the first flue gas inlet 412, the first flue gas outlet 413, and the first return port 414. As a preferable mode of the present invention, the first absorption chamber and the second absorption chamber are symmetrically arranged side by side, and the first exhaust pipe 417 is provided between the first absorption chamber and the second absorption chamber. The two absorption bins 400 are oppositely arranged, so that the pipelines are positioned between the two as much as possible, the pipelines are centralized and convenient to manage, and the pipelines can be protected at the same time.

Further, the receiving pipe 510 is a funnel-shaped pipe with a thick upper part and a thin lower part. The hopper-shaped pipe is convenient for collecting residues and is convenient for uniformly collecting materials. Further, the air inlet flue 520 is an L-shaped pipeline and comprises an air inlet pipe 521 arranged in an inclined manner and an air outlet pipe 522 arranged vertically, and the air inlet pipe 521 and the air outlet pipe 522 are bent and communicated inside the receiving pipe 510. The air inlet pipe 521 inclines upwards to be arranged, so that residues are prevented from being accumulated on the air inlet pipe 521, and the L-shaped pipeline is arranged to be an obtuse angle, so that the smoke can flow rapidly. Further, the first material blocking part 530 is an umbrella-shaped material blocking plate, and the umbrella-shaped material blocking plate is fixed at the end part of the air inlet flue 520 through a connecting column 531. The umbrella-shaped baffle plate can block fallen residues, so that the fallen residues are prevented from falling into the air inlet flue 520, and meanwhile, the residues slide down the slope of the umbrella cover and fall into the receiving pipe 510. Furthermore, the number of the connecting columns 531 is four, and the four connecting columns 531 are respectively perpendicular to the plate surface of the umbrella-shaped striker plate and fixed. Connecting columns 531 are respectively arranged along the peripheral direction of the air inlet flue 520, so that the material receiving stress of the first material blocking part 530 is shared in the peripheral direction, and the stability of the connecting structure is improved. Further, the second material blocking member 540 is an annular plate, and the annular plate is obliquely and downwardly fixed on the outer wall of the air intake flue 520. The annular plate is fixed in on the outlet duct 522 outer wall, is located umbrella type striker plate below, and the same slope sets up downwards, avoids keeping somewhere the residue. Further, the annular plate is a resetting plate with toughness. The annular plate possesses certain toughness, and when the residue was detained too much on the annular plate, the residue can make the residue fall into receiving tube 510 with annular plate pushing down to avoid piling up of residue, after the residue falls into receiving tube 510, the annular plate resets. Further, the distance from the lower edge of the annular plate to the receiving pipe 510 is smaller than the distance from the lower edge of the umbrella-shaped striker plate to the receiving pipe 510. Flue gas passes through umbrella type striker plate and gets into behind the receiver tube 510, can be preferred upward flow under the negative pressure effect, and when the negative pressure was less, the receiver tube 510 bottom was confined in normal operating, because blockking of annular plate, the flue gas can be preferred to flow to the bigger top space in space, and can not flow to the receiver tube 510 bottom. Further, the annular plate, the umbrella-shaped striker plate and the air outlet pipe 522 are coaxially arranged.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.