CN106871148B - Tee joint switching device for denitration of boiler - Google Patents

Tee joint switching device for denitration of boiler Download PDF

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Publication number
CN106871148B
CN106871148B CN201710210293.XA CN201710210293A CN106871148B CN 106871148 B CN106871148 B CN 106871148B CN 201710210293 A CN201710210293 A CN 201710210293A CN 106871148 B CN106871148 B CN 106871148B
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switching device
denitration
way switching
sealing
frame
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CN106871148A (en
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冯力燕
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/10—Nitrogen; Compounds thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The invention provides a three-way switching device for boiler denitration, which comprises a frame and a sealing baffle plate; the frame is positioned between the inlet and outlet connection parts of the flue of the denitration reactor and the flue of the low-temperature economizer or the air preheater and the flue of the high-temperature economizer or the air preheater; the sealing baffle is arranged on the frame, and one end of the sealing baffle, which is positioned at the joint of the inlet and the outlet of the denitration reactor, is hinged with the frame; the sealing baffle can be used as an axle center at the joint of the inlet and the outlet of the flue of the denitration reactor, and can move up and down to realize the opening and closing of the three-way switching device.

Description

Tee joint switching device for denitration of boiler
Technical Field
The invention relates to the field of chemical industry, in particular to a three-way switching device for boiler denitration.
Background
Because the boiler generally adopts a diesel oil and heavy oil ignition mode, a large amount of incompletely burnt oil smoke can be attached to the surface of an SCR denitration catalyst during the furnace ignition process after a Selective Catalytic Reduction (SCR) denitration process is adopted, so that the surface activity of the catalyst is reduced, the attached pollution is an irreversible process, the process cannot be cleaned, and the catalyst can be invalid in a large area when the boiler is in a serious time. After the catalyst is polluted, nitrogen oxides are out of standard, the environment is seriously polluted, and even the catalyst is forced to be stopped for replacing. When the boiler is leaked by pipe explosion, a large amount of water vapor enters the denitration reactor, and dust in the flue gas forms adhesion deposition in the catalyst, so that the catalytic reaction efficiency is affected to be reduced, even failure or blockage is caused, and serious environmental influence is caused, even the boiler is forced to stop.
In order to avoid the occurrence of the accidents, the bypass design is generally adopted when the denitration device is added in the existing boiler, an air door and an expansion joint are added to an inlet flue and an outlet flue of a denitration reactor respectively, and the air door and the expansion joint are also added on a short circuit, so that the denitration device has the following defects: the investment is large; sufficient space is needed, so that the frame height needs to be increased, and the investment and construction difficulty are increased; the operation and adjustment are very complicated, and the lack of coordination can cause negative pressure fluctuation of the boiler and even fire extinguishing and furnace stopping.
Disclosure of Invention
The invention aims to overcome at least one defect of the prior art, and is used for designing and installing a newly built boiler SCR denitration system and improving the SCR denitration of an old boiler, so that when the boiler SCR denitration device is ignited and put into operation or a pipe explosion leakage accident occurs in the boiler, the denitration reactor can be temporarily cut off, the pollution of oil smoke and water vapor or the blocking of a catalyst is avoided, and the purposes of ensuring the operation safety of the boiler, reducing economic loss and reducing investment are achieved while ultra-low emission is achieved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a three-way switching device for denitration of a boiler, which comprises a frame and a sealing baffle plate;
the frame is positioned between the inlet and outlet connection parts of the flue of the denitration reactor and the flue of the low-temperature economizer or the air preheater and the flue of the high-temperature economizer or the air preheater;
the sealing baffle is arranged on the frame, and one end of the sealing baffle, which is positioned at the joint of the inlet and the outlet of the denitration reactor, is hinged with the frame; the sealing baffle can be used as an axle center at the joint of the inlet and the outlet of the flue of the denitration reactor, and can move up and down to realize the opening and closing of the three-way switching device.
Further, as an embodiment of the present invention, in an embodiment of the present invention, a sealing groove is provided at a connection portion between the frame and the sealing plate, a downward protrusion is provided at a connection portion between the sealing plate and the frame, and the protrusion is overlapped into the sealing groove, so as to realize sealing between the sealing plate and the frame.
Further, as an embodiment of the present invention, in an embodiment of the present invention, the three-way switching device further includes a connecting rod and a control valve, wherein one end of the connecting rod is hinged on the upper surface of the sealing baffle, and the other end of the connecting rod is hinged on the valve rod of the control valve.
Further, as an embodiment of the present invention, in an embodiment of the present invention, a lifting device is disposed on the control valve, for implementing opening of the three-way switching device.
Further, as an embodiment of the present invention, in an embodiment of the present invention, the three-way switching device further includes a closing hinge, where the closing hinge is connected to a lower surface of the sealing baffle, and is used to implement closing of the three-way switching device.
Further, as an embodiment of the present invention, in an embodiment of the present invention, the control valve further includes a valve stem sleeve, and the valve stem sleeve is sleeved outside the valve stem.
Further, as an embodiment of the present invention, in an embodiment of the present invention, the control valve further includes a sealing and transmission mechanism.
Further, as an embodiment of the present invention, in an example of the present invention, a wear plate is provided on the windward side of the flue at the corner.
Further, the three-way switching device is provided with a plurality of sealing baffles, and the frame is correspondingly divided into a plurality of frames. The junction of every frame and sealing baffle is equipped with the seal groove on the frame, and sealing baffle is equipped with decurrent arch with the junction of frame, protruding overlap joint is to in the seal groove, realizes sealing between sealing baffle and the frame.
Compared with the prior art, the invention has the following advantages:
according to the relative positions of the denitration device and the original boiler, the effective space distance is fully utilized, and the denitration three-way switching device is designed and manufactured under the condition that the integral layout of denitration and the boiler is not affected. The design effectively turns to sealing baffle, during boiler furnace ignition or when the explosion tube leakage accident takes place, will seal baffle one side with denitration flue exit junction as the axle center, upwards slide to the bottom along effective stroke, and the flue gas directly gets into afterbody heating surface along the close way under the negative pressure effect, carries out effective desorption through electric precipitation and desulphurization unit and discharges, realizes effectively keeping apart SCR denitration system. When the boiler is in normal operation, one side of the baffle plate is downwards slid to the bottom according to the effective stroke, the baffle plate is lapped to the sealing groove at the other side of the inlet and the outlet, the direct exhaust channel is closed, the flue gas is integrated into the denitration reactor, and nitrogen oxides are effectively removed through SCR denitration, so that environment-friendly ultra-low emission is realized.
The device has the following characteristics: 1) The design is succinct, the action is reliable, convenient to use, the effective utilization space has got rid of three baffle doors of conventional design, practices thrift the investment cost (each boiler can practice thrift more than 60 ten thousand yuan), and construction work load reduces, can shorten construction cycle greatly. 2) The clamping groove type sealing device is adopted, so that good sealing performance in normal operation is effectively ensured. 3) The abrasion-proof plate is added to the design of the wind surface of the flue gas turning, so that the scouring abrasion caused by the flue gas turning with high dust content is avoided. 4) The bidirectional pulling adjustment is adopted, so that the jamming caused by long-term high temperature and corrosion is avoided, the good use effect is ensured, and the remote automatic adjustment can be realized by adopting pneumatic or electric driving. 5) And the frame type multi-door arrangement is adopted in the transverse direction of the flue according to the flue size, so that each door can avoid the sealing failure caused by high-temperature deformation, and the adjustment flexibility is improved. 6) Due to the adoption of the single valve plate structure, the negative pressure stability of the boiler can be ensured in the adjustment process, and no influence is caused on the load.
The invention applies the technology to the boiler in the factory, and the surface of the denitration catalyst is clean, perfect and free from pollution phenomenon of oil pollution when the boiler is shut down for the first time, the three-way door is simple in design, complete and reliable in action, free from phenomena of air leakage and deformation, capable of saving space, reducing the initial investment of the denitration device, ensuring the stability of the adjustment process and obvious in effect.
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a boiler employing a three-way switching device in one embodiment of the present invention.
Fig. 2 is an enlarged view of a in fig. 1.
Fig. 3 is a schematic structural view of a sealing baffle of a three-way switching device according to another embodiment of the present invention when the sealing baffle is closed.
Fig. 4 is an enlarged view of B in fig. 3.
Fig. 5 is an enlarged view of C in fig. 3.
Fig. 6 is a schematic structural view of the three-way switching device in fig. 3 when the sealing baffle is opened.
Detailed Description
FIG. 1 is a schematic diagram of a boiler employing a three-way switching device in one embodiment of the present invention. Fig. 2 is an enlarged view of a in fig. 1. As can be seen from fig. 1 and 2, the three-way switching device 400 for denitration of a boiler according to the present invention is located between the denitration reactor 300, the low-temperature economizer or air preheater 200, and the high-temperature economizer or air preheater 100.
Fig. 3 is a schematic structural view of a sealing baffle of a three-way switching device according to another embodiment of the present invention when the sealing baffle is closed. As shown in fig. 3, the boiler denitration three-way switching device 400 of the present embodiment includes a frame 1 and a sealing baffle 2.
Wherein the frame 1 is positioned at the inlet and outlet connection of the flue of the denitration reactor, between the flue of the low-temperature economizer or the air preheater and between the flue of the high-temperature economizer or the air preheater.
The sealing baffle plate 2 is arranged on the frame 1, and one end of the sealing baffle plate 2, which is positioned at the joint of the inlet and the outlet of the denitration reactor, is hinged with the frame 1; the sealing baffle plate 2 can move up and down by taking the joint of the inlet and the outlet of the flue of the denitration reactor as the axis, so as to realize the opening and closing of the three-way switching device.
Fig. 4 is an enlarged view of B in fig. 3. Fig. 5 is an enlarged view of C in fig. 3. As shown in fig. 4 and 5, the frame 1 is provided with a sealing groove 11, the sealing baffle is provided with a downward bulge 21, and the bulge 21 is lapped into the sealing groove 11 to realize sealing between the sealing baffle 2 and the frame 1. By adopting the clamping groove type sealing device, good sealing performance in normal operation is effectively ensured.
In the invention, a plurality of sealing baffles 2 can be arranged, the corresponding frame 1 is divided into a plurality of frames, and each frame is provided with a sealing groove at the moment, so that the sealing between the sealing baffles and the frames is realized.
The three-way switching device also comprises a connecting rod 3, a valve rod sleeve 4, a valve rod 6 and a sealing and transmission mechanism 5.
Wherein one end of the connecting rod 3 is hinged on the upper surface of the sealing baffle plate 2, and the other end is hinged on the valve rod 6.
The valve rod sleeve 4 is sleeved outside the valve rod 6. The sealing and driving mechanism 5 is used for realizing the sealing and driving of the control valve.
The control valve is provided with a lifting device which can drive the valve rod 6 to move upwards, so as to drive the connecting rod 3 to move, and further pull the sealing baffle plate 2 to open upwards.
The three-way switching device further comprises a closing hinge 8, wherein the closing hinge 8 is connected to the lower surface of the sealing baffle 2, and the three-way switching device is closed in an auxiliary mode.
Further, the windward surface of the flue turning part is provided with an anti-abrasion plate 7, so that the scouring abrasion caused by turning of the flue gas with high dust content is avoided.
When the sealing baffle plate 2 of the three-way switching device is closed, the arrow in fig. 3 indicates the running direction of the flue gas, and as shown in fig. 3, the flue gas from the high-temperature economizer or the air preheater 100 enters the denitration reactor 300 along the flue above the sealing baffle plate 2; the flue gas from the denitration reactor 300 for removing nitrogen oxides returns to the low-temperature economizer or air preheater 200 through the flue at the lower part of the sealing baffle plate 2, and enters the tail heating surface for emission. In this state, the sealing baffle clamping groove type sealing structure determines the tightness, and the exceeding standard of the emission of nitrogen oxides is avoided.
When the accidents such as initial ignition or pipe explosion of the boiler occur, the sealing baffle plate 2 of the three-way switching device is opened, the arrow in fig. 6 indicates the running direction of the smoke, and as shown in fig. 6, the smoke from the high-temperature economizer or air preheater 100 directly enters the low-temperature economizer or air preheater 200 downwards along the position in front of the sealing baffle plate 2, enters the tail heating surface, and the smoke containing the oil smoke or water vapor is not introduced into the denitration reactor 300 under the action of negative pressure. In this state, the invention sets the wear-proof plate 7 at the turning part, enhances the wear-proof performance, and avoids the windward abrasion and local dust accumulation.
Although the invention has been described with reference to the preferred embodiments, it should be understood that the invention is not limited thereto, but rather may be modified and varied by those skilled in the art without departing from the spirit and scope of the invention.

Claims (6)

1. The three-way switching device for the boiler denitration is characterized by comprising a frame and a sealing baffle;
the frame is positioned between the inlet and outlet connection parts of the flue of the denitration reactor and the flue of the low-temperature economizer or the air preheater and the flue of the high-temperature economizer or the air preheater;
the sealing baffle is arranged on the frame, and one end of the sealing baffle, which is positioned at the joint of the inlet and the outlet of the denitration reactor, is hinged with the frame; the sealing baffle can move up and down by taking the joint of the inlet and the outlet of the flue of the denitration reactor as the axis, so as to realize the opening and closing of the three-way switching device;
the three-way switching device also comprises a connecting rod and a control valve, wherein one end of the connecting rod is hinged to the upper surface of the sealing baffle, and the other end of the connecting rod is hinged to a valve rod of the control valve;
the control valve is provided with a lifting device for realizing the opening of the three-way switching device;
the control valve further comprises a valve rod sleeve, and the valve rod sleeve is sleeved outside the valve rod.
2. The three-way switching device for denitration of a boiler according to claim 1, wherein a sealing groove is arranged at the joint of the frame and the sealing baffle, downward protrusions are arranged at the joint of the sealing baffle and the frame, and the protrusions are lapped into the sealing groove to realize sealing between the sealing baffle and the frame.
3. The three-way switching device for denitration of a boiler according to claim 1, further comprising a closing hinge connected to the lower surface of the sealing baffle for closing the three-way switching device.
4. The three-way switching device for denitration of a boiler of claim 1, wherein the control valve further comprises a sealing and transmission mechanism.
5. The three-way switching device for denitration of a boiler according to claim 1, wherein an anti-abrasion plate is arranged on the windward surface of the turning part of the flue.
6. The three-way switching device for denitration of a boiler according to claim 2, wherein the three-way switching device is provided with a plurality of sealing baffles, and the frame is divided into a plurality of frames correspondingly.
CN201710210293.XA 2017-03-31 2017-03-31 Tee joint switching device for denitration of boiler Active CN106871148B (en)

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CN201710210293.XA CN106871148B (en) 2017-03-31 2017-03-31 Tee joint switching device for denitration of boiler

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Application Number Priority Date Filing Date Title
CN201710210293.XA CN106871148B (en) 2017-03-31 2017-03-31 Tee joint switching device for denitration of boiler

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CN106871148B true CN106871148B (en) 2023-04-25

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Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3373771B2 (en) * 1997-10-08 2003-02-04 株式会社東芝 Waste heat recovery boiler
CN103900097B (en) * 2014-03-26 2016-02-10 东南大学 A kind of boiler SCR denitration remodeling method and device
CN205517269U (en) * 2016-01-18 2016-08-31 同方环境股份有限公司 SCR denitrification facility suitable for two economizers, air preheater staggered arrangement
CN206626594U (en) * 2017-03-31 2017-11-10 冯力燕 The threeway switching device of Denitration in Boiler

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