CN113968586A - A sealed air duct seat of a urea pyrolysis spray gun - Google Patents
A sealed air duct seat of a urea pyrolysis spray gun Download PDFInfo
- Publication number
- CN113968586A CN113968586A CN202111250933.2A CN202111250933A CN113968586A CN 113968586 A CN113968586 A CN 113968586A CN 202111250933 A CN202111250933 A CN 202111250933A CN 113968586 A CN113968586 A CN 113968586A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- round steel
- spray gun
- urea pyrolysis
- air duct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 239000004202 carbamide Substances 0.000 title claims abstract description 54
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 51
- 239000007921 spray Substances 0.000 title claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 103
- 239000010959 steel Substances 0.000 claims abstract description 103
- 238000007789 sealing Methods 0.000 claims abstract description 43
- 238000003466 welding Methods 0.000 claims abstract description 22
- 230000001154 acute effect Effects 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000779 smoke Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/02—Preparation, purification or separation of ammonia
- C01C1/08—Preparation of ammonia from nitrogenous organic substances
- C01C1/086—Preparation of ammonia from nitrogenous organic substances from urea
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/02—Flanged joints the flanges being connected by members tensioned axially
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L23/00—Flanged joints
- F16L23/16—Flanged joints characterised by the sealing means
- F16L23/18—Flanged joints characterised by the sealing means the sealing means being rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a sealing air pipe seat of a urea pyrolysis spray gun, wherein a sealing ring is fixed at one end of a first round steel pipe, a plate-type flat welding flange is sleeved on the outer wall of the first round steel pipe, an inner ring of a circular steel plate is fixed on the inner wall of the first round steel pipe, an outer ring of the circular steel plate is fixed at one end of a second round steel pipe, the other end of the second round steel pipe is connected with one end of a reducing joint, the other end of the reducing joint is connected with one end of a third round steel pipe, and a neck-carrying flat welding flange is connected with the other end of the third round steel pipe; the round pipe is communicated with a round hole right above the second round steel pipe; one end of the first round steel pipe penetrates through the second round steel pipe to be in contact with the inner wall of the reducing joint; the end of the first round steel pipe, which is contacted with the inner wall of the reducing joint, is provided with a plurality of rectangular grooves, and the sealed air pipe seat can realize the online plugging and unplugging of the urea pyrolysis spray gun and has the characteristics of simple structure and low compressed air consumption.
Description
Technical Field
The invention relates to a sealing air duct base, in particular to a sealing air duct base of a urea pyrolysis spray gun.
Background
Selective Catalytic Reduction (SCR) denitration technology is the mainstream technology for controlling the content of NOx in flue gas of coal-fired units in China. Ammonia gas is a reducing agent of the SCR denitration technology, and is subjected to a removal reaction with NOx in the flue gas on the surface of the catalyst. Ammonia is typically produced by means of liquid ammonia evaporation, urea hydrolysis or urea pyrolysis processes. Among the preparation technologies of a plurality of reducing agents, the urea pyrolysis technology is widely applied. The urea pyrolysis technology is characterized in that high-temperature flue gas (350-650 ℃) is introduced into a urea pyrolysis furnace, urea solution is atomized and then sprayed into the urea pyrolysis furnace, and under the action of the high-temperature flue gas in the urea pyrolysis furnace, the urea solution is decomposed into a reducing agent required by SCR denitration. In the pyrolysis technology of the urea pyrolysis furnace, a urea pyrolysis spray gun is a key device, and the atomization characteristic of the spray gun directly influences the efficiency of urea pyrolysis. In actual use, because the efficiency of urea pyrolysis can not be influenced to the not good, the spray gun atomizing characteristic of heat preservation effect, in service, need pull out the inspection with urea pyrolysis spray gun usually. Because the pyrolysis furnace is the malleation operation, and the flue gas temperature is higher, and the in-process of spray gun plug, the easy blowout of high temperature flue gas is wounded, consequently needs design a simple structure, compressed air consumption is low, can realize the device of urea pyrolysis spray gun online plug.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sealing air pipe seat of a urea pyrolysis spray gun, which can realize the on-line plugging and unplugging of the urea pyrolysis spray gun and has the characteristics of simple structure and low compressed air consumption.
In order to achieve the aim, the sealing air pipe seat of the urea pyrolysis spray gun comprises a sealing ring, a first round steel pipe, a plate type flat welding flange, a circular steel plate, a round pipe, a second round steel pipe, a reducing joint, a third round steel pipe and a neck flat welding flange;
the sealing ring is fixed at one end of the first round steel pipe, the plate type flat welding flange is sleeved on the outer wall of the first round steel pipe, the inner ring of the circular steel plate is fixed on the inner wall of the first round steel pipe, the outer ring of the circular steel plate is fixed at one end of the second round steel pipe, the other end of the second round steel pipe is connected with one end of the reducing joint, the other end of the reducing joint is connected with one end of the third round steel pipe, and the neck-containing flat welding flange is connected with the other end of the third round steel pipe; the round pipe is communicated with a round hole right above the second round steel pipe; one end of the first round steel pipe penetrates through the second round steel pipe to be in contact with the inner wall of the reducing joint;
the end of the first round steel pipe, which is contacted with the inner wall of the reducing joint, is provided with a plurality of rectangular grooves.
The axis of the first round steel pipe is superposed with the axis of the reducing joint.
The plate type flat welding flange is provided with a positioning hole, the sealing ring is provided with a positioning groove, and the pin penetrates through the positioning hole and is inserted into the positioning groove to tightly press and position the sealing ring and the plate type flat welding flange.
The inlet of the round steel is provided with internal threads.
All the rectangular grooves are uniformly distributed along the circumferential direction.
The rectangular groove and the axis direction of the first round steel tube form an acute angle.
The sealing ring is welded to the end of the first round steel tube.
The inner ring of the circular steel plate is welded on the inner wall of the first circular steel tube;
the outer ring of the circular steel plate is welded at the end part of the second round steel pipe.
The second round steel pipe is welded with the reducing joint.
The reducing joint and the third round steel pipe are welded.
The invention has the following beneficial effects:
when the sealing air pipe seat of the urea pyrolysis spray gun is in specific operation and the urea pyrolysis spray gun needs to be overhauled, the urea solution and the atomized air at the inlet of the urea pyrolysis spray gun are cut off, compressed air is introduced into the urea pyrolysis spray gun, enters a space surrounded by the first round steel pipe, the circular steel plate, the second round steel pipe and the reducing joint through the round steel, is sprayed into the sealing air pipe seat through the rectangular groove, and then forms a compressed air curtain in the sealing air pipe seat, so that high-temperature smoke is effectively prevented from flowing out, the urea pyrolysis spray gun is plugged in and pulled out on line, and the urea pyrolysis spray gun has the characteristics of simple structure and low compressed air consumption.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a first round steel pipe;
figure 3 is a side view of a first round steel tube;
fig. 4 is an installation drawing of the present invention.
Wherein, 1 is the sealing ring, 2 is the flat welding flange of board-like, 3 is first circular steel pipe, 4 is the ring steel board, 5 is the pipe, 6 is the second circular steel pipe, 7 is the reducing joint, 8 is the third circular steel pipe, 9 is the flat welding flange of area neck, 10 is sealed tuber pipe seat, 11 is urea pyrolysis spray gun installation pipe, 12 is urea pyrolysis spray gun.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, 2 and 3, the sealing air duct seat of the urea pyrolysis spray gun of the invention comprises a sealing ring 1, a plate type flat welding flange 2, a first round steel tube 3, a circular steel plate 4, a circular tube 5, a second round steel tube, a reducing joint 7, a third round steel tube 8 and a neck flat welding flange 9;
the sealing ring 1 is welded at one end of a first circular steel tube 3, the plate type flat welding flange 2 is sleeved on the outer wall of the first circular steel tube 3, the inner ring of a circular steel plate 4 is welded on the inner wall of the first circular steel tube 3, the outer ring of the circular steel plate 4 is welded at one end of a second circular steel tube 6, the other end of the second circular steel tube 6 is welded with one end of a reducing joint 7, the other end of the reducing joint 7 is welded with one end of a third circular steel tube 8, and the neck-shaped flat welding flange 9 is welded at the other end of the third circular steel tube 8; the round pipe 5 is communicated with a round hole right above the second round steel pipe 6; one end of the first round steel pipe 3 passes through the second round steel pipe 6 to be contacted with the inner wall of the reducing joint 7;
the end of the first round steel pipe 3, which is contacted with the inner wall of the reducing joint 7, is provided with a plurality of rectangular grooves.
When the first round steel tube 3 and the circular steel plate 4 are welded, the end part of the first round steel tube 3 is attached to the inner wall of the reducing joint 7 along the circumference, the axis of the first round steel tube 3 coincides with the axis of the reducing joint 7, and then the first round steel tube 3 is welded with the circular steel plate 4.
The locating hole has been seted up on board-like flat welding flange 2, is provided with positioning groove on the sealing ring 1, and when the installation, the pin passes the locating hole insert in positioning groove compresses tightly the location with sealing ring 1 and board-like flat welding flange 2, and the entry of round steel 5 is provided with the internal thread, is convenient for insert external compressed air and takes over.
All the rectangular grooves are uniformly distributed along the circumferential direction, and the rectangular grooves and the axis direction of the first round steel tube 3 form acute angles, when the air-cooled;
referring to fig. 4, the installation process of the present invention is:
a urea pyrolysis spray gun mounting pipe seat 11 is mounted on a furnace wall of a urea pyrolysis furnace, a sealing air pipe seat 10 is connected with the urea pyrolysis spray gun mounting pipe seat 11 through a flange bolt, and a urea pyrolysis spray gun 12 is connected with the sealing air pipe seat 10 through a flange bolt. In practical application, when the urea pyrolysis spray gun 12 needs to be overhauled, the urea solution and the atomizing air at the inlet of the urea pyrolysis spray gun 12 are cut off, meanwhile, compressed air passes through the sealing air pipe seat 10, and enters the urea pyrolysis spray gun mounting pipe seat 11 through the sealing air pipe seat 10 to form an air curtain; then the bolts between the urea pyrolysis spray gun 12 and the sealing air pipe seat 10 are untied, and the urea pyrolysis spray gun 12 can be drawn out.
The principle of the invention is as follows: compressed air gets into in the inside ring-shaped cavity of sealed tuber pipe seat 10, then flows out through a plurality of rectangle recesses of its tip, forms the air curtain inside sealed tuber pipe seat 10, because compressed air's pressure is higher, the pressure of the inside flue gas of urea pyrolysis oven is lower, the air curtain that compressed air formed can effectively prevent the high temperature flue gas outflow. On the other hand, the circular ring cavity cross-sectional area inside the sealing air pipe seat 10 is far greater than the flow cross-sectional area of all rectangular grooves, so that after compressed air enters the circular ring cavity of the pipe seat, when the compressed air flows out of the sealing air pipe seat 10 through all the rectangular grooves, main resistance loss is at all the rectangular grooves, and the flow of the compressed air flowing in all the rectangular grooves can be guaranteed to be equal, so that an air curtain with uniform flow can be formed when the compressed air flows out of the rectangular grooves, and high-temperature smoke is effectively prevented from flowing out.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111250933.2A CN113968586A (en) | 2021-10-26 | 2021-10-26 | A sealed air duct seat of a urea pyrolysis spray gun |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111250933.2A CN113968586A (en) | 2021-10-26 | 2021-10-26 | A sealed air duct seat of a urea pyrolysis spray gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113968586A true CN113968586A (en) | 2022-01-25 |
Family
ID=79588485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111250933.2A Pending CN113968586A (en) | 2021-10-26 | 2021-10-26 | A sealed air duct seat of a urea pyrolysis spray gun |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113968586A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1374976A1 (en) * | 2002-06-20 | 2004-01-02 | Siemens Aktiengesellschaft | Process and reactor for the conversion of urea to ammonia and exhaust gas cleaning system |
| CN203833627U (en) * | 2014-05-14 | 2014-09-17 | 北京洛卡环保技术有限公司 | Pyrolysis furnace air sealing device for system for ammonia production by pyrolysis of urea |
| CN203877928U (en) * | 2014-06-18 | 2014-10-15 | 大唐科技产业集团有限公司 | Urea pyrolysis furnace and spray gun transition connecting device thereof |
| CN110102156A (en) * | 2019-05-21 | 2019-08-09 | 南京杰科丰环保技术装备研究院有限公司 | The device of spray gun is replaced or overhauled online to a kind of urea pyrolysis reactor |
| EP3650756A1 (en) * | 2018-11-07 | 2020-05-13 | Steinmüller Engineering GmbH | Demounatble lance system |
-
2021
- 2021-10-26 CN CN202111250933.2A patent/CN113968586A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1374976A1 (en) * | 2002-06-20 | 2004-01-02 | Siemens Aktiengesellschaft | Process and reactor for the conversion of urea to ammonia and exhaust gas cleaning system |
| CN203833627U (en) * | 2014-05-14 | 2014-09-17 | 北京洛卡环保技术有限公司 | Pyrolysis furnace air sealing device for system for ammonia production by pyrolysis of urea |
| CN203877928U (en) * | 2014-06-18 | 2014-10-15 | 大唐科技产业集团有限公司 | Urea pyrolysis furnace and spray gun transition connecting device thereof |
| EP3650756A1 (en) * | 2018-11-07 | 2020-05-13 | Steinmüller Engineering GmbH | Demounatble lance system |
| CN110102156A (en) * | 2019-05-21 | 2019-08-09 | 南京杰科丰环保技术装备研究院有限公司 | The device of spray gun is replaced or overhauled online to a kind of urea pyrolysis reactor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203452874U (en) | SCR catalyzing silencer and mixing tube device of SCR catalyzing silencer | |
| CN104888990A (en) | Double-fluid atomization spray gun | |
| CN205297699U (en) | Mixing arrangement that admits air of SCR system | |
| CN107916973B (en) | SCR urea sprays protection system | |
| CN209838505U (en) | Radial injection close-coupled mixing device for mixing reducing agent fluid | |
| CN203043831U (en) | A reducing agent injection device for SNCR denitrification | |
| CN113968586A (en) | A sealed air duct seat of a urea pyrolysis spray gun | |
| CN201871432U (en) | Atomizing spray nozzle structure used for spraying liquid reducing agents in SCR (selective catalytic reduction) system | |
| CN204412055U (en) | A kind of dore furnace flue gas SNCR denitration device reducing agent high-efficiency atomizer | |
| CN106762054A (en) | A kind of SCR system nozzle integrated form urea blender | |
| CN102748106A (en) | Urea nozzle of SCR (Selective Catalytic Reduction) system and mounting structure of urea nozzle | |
| CN211359251U (en) | Jet-suction type atomizing spray gun | |
| CN104948276A (en) | Air assisting type urea ejector | |
| CN206329370U (en) | A kind of urea injector of axially injection | |
| CN201760232U (en) | A spray gun type double-flow nozzle for flue gas denitrification | |
| CN204746667U (en) | Flue gas denitration spray gun | |
| CN106523100A (en) | Axial injection urea injector | |
| CN111810278A (en) | A radial jet tight coupling type mixing device for mixing reducing agent fluid | |
| CN215964212U (en) | A kind of high-temperature atomizing nozzle for anti-gravity spraying long-neck urea solution | |
| CN202250315U (en) | A Diesel Engine SCR Atomizer Used in Air-Assisted Mode | |
| CN211026850U (en) | An atomizing nozzle assembly | |
| CN202645690U (en) | Urea nozzle of SCR (Selective Catalytic Reduction) system and mounting structure thereof | |
| CN102042063A (en) | Atomizing jet-spray device for reducing agent for purifying exhaust nitric oxide of diesel engine | |
| CN207546201U (en) | A kind of urea liquid jetting device for denitrating flue gas | |
| CN204746666U (en) | Flue gas denitration spray gun |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220125 |
|
| RJ01 | Rejection of invention patent application after publication |