CN207667444U - A kind of SCR denitration urea pyrolysis device of flue gas - Google Patents
A kind of SCR denitration urea pyrolysis device of flue gas Download PDFInfo
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- CN207667444U CN207667444U CN201721595056.1U CN201721595056U CN207667444U CN 207667444 U CN207667444 U CN 207667444U CN 201721595056 U CN201721595056 U CN 201721595056U CN 207667444 U CN207667444 U CN 207667444U
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- pyrolysis
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- flue gas
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- urea
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The utility model discloses a kind of SCR denitration urea pyrolysis devices of flue gas, belong to denitrating flue gas field, including pyrolysis installation shell, air preheat is restrained, urea liquid jet chamber, it is pyrolyzed heating tube tube bank, pyrolysis installation shell is equipped with smoke inlet and exhanst gas outlet, between smoke inlet and exhanst gas outlet in pyrolysis installation shell, it is equipped with the tube bank of pyrolysis heating tube and air preheat tube bank successively along flue gas direction, it is connected by urea liquid jet chamber between the outlet and the entrance of pyrolysis heating tube tube bank of air preheat tube bank, urea liquid spray gun is equipped in urea liquid jet chamber.The utility model can improve flue gas heat utilization efficiency, reduce exhaust gas volumn；Device characteristics of compact layout reaches and saves device the space occupied/place and inexpensive purpose.
Description
Technical field
The utility model belongs to denitrating flue gas field more particularly to a kind of urea pyrolysis device.
Background technology
Selective catalytic reduction flue gas denitration technique (Selective Catalytic Reduction of NOx, referred to as
SCR denitration technique) reducing agent mainly has three kinds of liquefied ammonia, ammonium hydroxide, urea forms.Liquefied ammonia is since process system is simple, investment and fortune
Row cost is relatively low, is applied relatively extensively in SCR denitration technique, but liquefied ammonia belongs to high-risk product, and transport and storage request are harsh
And limited more and more by policy, regulation, it is extremely inconvenient；Equally, ammonium hydroxide is also because of its transport, storage problem and throwing
Money operating cost occupies high and is limited to by what is applied；As the lower SCR denitration reducing agent-urea of security requirement have with
The identical denitration performance of liquefied ammonia, not dangerous policy, regulation limitation, can easily be transported, stores and use.
For urea as SCR denitration reducing agent, main technique has pyrolysis ammonia and hydrolysis Ammonia Process, wherein pyrolytic process system
Ammonia is also used by power plant more and more since system investment cost is low, stable, maintenance is small.In order to reduce urea heat
The energy consumption of solution technique ammonia, boiler smoke heating air are used more and more as the heat source of SCR denitration urea pyrolysis.Such as
Chinese patent literature notification number CN103191640B is disclosed a kind of in boiler internal arrangement flue gas-air heat exchanger, boiler smoke
Gas is used as the heat source of SCR denitration urea pyrolysis by flue gas-air heat exchanger heat exchange air, which lacks
It falls into, for denitration transformation project, there is certain technical difficulty in boiler internal arrangement flue gas-air heat exchanger.Chinese patent
Document application number CN201220091559.6 discloses a kind of denitration urea pyrolysis Ammonia Process device, the patented technology list
Heat exchanger and the urea pyrolysis room of heating air is solely respectively set, flue gas heat utilization efficiency is low, and system occupied ground is big, of high cost,
It is limited by space, it is difficult to implement in denitration transformation.
Utility model content
The purpose of this utility model is that：A kind of SCR denitration urea pyrolysis device of flue gas is provided, flue gas heat is improved
Utilization rate reduces exhaust gas volumn；Device characteristics of compact layout reaches and saves device the space occupied/place and inexpensive purpose.
The purpose of this utility model is realized by following technical proposals：
A kind of SCR denitration urea pyrolysis device of flue gas, including pyrolysis installation shell, air preheat tube bank, urea
Solution jet chamber, pyrolysis heating tube tube bank, pyrolysis installation shell is equipped with smoke inlet and exhanst gas outlet, in pyrolysis installation shell
Smoke inlet and exhanst gas outlet between, along flue gas direction successively be equipped with pyrolysis heating tube tube bank and air preheat tube bank, air
It preheats and is connected by urea liquid jet chamber between the outlet of tube bank and the entrance of pyrolysis heating tube tube bank, urea liquid injection
Interior is equipped with urea liquid spray gun.
Alternatively, the entrance of air preheat tube bank is connected to one/secondary air channel of boiler.
Alternatively, pyrolysis installation shell and urea liquid jet chamber are closely coupled.
Alternatively, further include air main pipe and air tube bank, air main pipe is restrained with air successively, air preheat is restrained
It is connected.
Alternatively, further include thermal decomposition product convergence pipe and pyrolysis tube bank outlet, it is direct or logical to be pyrolyzed heating tube tube bank
It crosses pyrolysis tube bank outlet with thermal decomposition product convergence pipe to be connected, the spray ammonia pipeline phase of thermal decomposition product convergence pipe and SCR denitration device
Even.
Alternatively, pyrolysis installation shell is made of entrance, bringing-up section, outlet section, the tube bank of pyrolysis heating tube and air
Preheating tube bank is set in bringing-up section, and is pyrolyzed heating tube tube bank close to entrance, and air preheat tube bank is close to outlet section.
As further selection, the smoke-gas area of 400-900 DEG C of entrance and boiler is connected to, outlet section and boiler economizer
Outlet downstream flue is connected.
Alternatively, the pipe diameter of air preheat tube bank and pyrolysis heating tube tube bank is 20-80mm.
The aforementioned main scheme of the utility model and its each further selection scheme can be freely combined to form multiple schemes,
The scheme that can be used and be claimed for the utility model；And the utility model, (each non conflicting selection) selection between and
It can also be freely combined between other selections.Those skilled in the art are after understanding the present invention program according to the prior art and public affairs
Know that common sense can be illustrated there are many combination, is the claimed technical solution of the utility model, does not do exhaustion herein.
The workflow of the utility model：
Air from one/secondary air channel of boiler enters air main pipe, and the air of air main pipe enters to be made of N root branch pipes
Air preheat tube bank in.
400-900 DEG C of the flue gas from boiler economizer upstream enters in urea pyrolysis device case, is urinated as heating
The heat source of the heat source and preheated air of element.
The air of air preheat tube bank is by smoke pre-heating to 100-350 DEG C.
It in urea liquid jet chamber, is preheating in 100-350 DEG C of air and sprays into urea liquid, carrier is done with air and is taken
The urea admixture of band, again by 400-900 DEG C of flue gas, is heated to 350-650 DEG C, urine in pyrolysis heating tube tube bank
Element is heated to be decomposed into ammonia, reducing agent of the ammonia as SCR denitration.The urea admixture of carrier carrying is done by heating air
Afterwards, flue-gas temperature drops to 350-700 DEG C, for preheated air again, by air preheat to 100-350 DEG C.Smoke pre-heating air
Afterwards, temperature is reduced to 200-400 DEG C and returns to boiler economizer downstream flue.
After 400-900 DEG C of flue gas urea admixture, temperature is reduced to the 350-700 DEG C of heat as preheated air
Source reaches reduction and draws boiler smoke tolerance purpose to improve flue gas heat utilization efficiency.
The beneficial effects of the utility model：
1, air is heated using boiler smoke, and the synchronous urea that sprays into makes urea pyrolysis at ammonia during air heats
As SCR denitration reducing agent, air heating and urea are carried out at the same time by thermal decomposition；Heat exchanger and the global design of urea pyrolysis room,
Place and space have been saved, has been conducive to implement in denitration transformation project, advantageously reduces cost of investment；
2, the hot secondary use of flue gas improves flue gas heat utilization efficiency.
Description of the drawings
Fig. 1 is the device flow diagram of the utility model embodiment 1；
Fig. 2 is the device flow diagram of the utility model embodiment 2.
Specific implementation mode
The utility model is further described with reference to specific embodiments and the drawings.
Embodiment 1：
Refering to what is shown in Fig. 1, the urea pyrolysis device of flue gas is mainly by pyrolysis installation shell 1, air main pipe 2, air
Tube bank 21, air preheat tube bank 22, urea liquid jet chamber 3, pyrolysis tube bank 4, thermal decomposition product convergence pipe 5 form.Thermal decomposition product
Convergence pipe 5 is connected with the spray ammonia pipeline of SCR denitration device, is used for SCR denitration.
Pyrolysis installation shell 1 is made of entrance 11, bringing-up section 12, outlet section 13.Entrance 11 is equipped with smoke inlet, draws
Enter the flue gas of 400-900 DEG C of the boiler of 0.5-3%, outlet section 13 is equipped with exhanst gas outlet, with boiler economizer outlet downstream flue
It is connected, is that 200-400 DEG C of flue gas sends boiler back to by temperature after heat exchange.
Air main pipe 2 is connected with one/secondary air channel of boiler, draws the air of 0.5-3%.Air main pipe 2 successively with air
Tube bank 21, air preheat tube bank 22 are connected, and air preheat tube bank 22 is arranged in close to 1 outlet section 13 of urea pyrolysis device case
Inside bringing-up section 12, after smoke pre-heating, the air themperature of air preheat tube bank 22 reaches 100-350 DEG C.
Air preheat tube bank 22 is connected by urea liquid jet chamber 3 with pyrolysis tube bank 4, by urea liquid spray gun 31, connection
Network pipeline 32, hot air inlet (i.e. the outlet of air preheat tube bank) 33 compositions.
Pyrolysis tube bank 4 is by thermal decomposition tube beam entrance (entrance for being pyrolyzed heating tube tube bank) 41, pyrolysis heating tube tube bank 42, heat
Solution tube bank outlet 43 forms, wherein pyrolysis heating tube tube bank 42 is arranged in the heating of pyrolysis installation shell 1 with coiled pipe pattern
In section 12.
It is preheating to 100-350 DEG C of air and enters jet chamber from hot air inlet 33, and pass through urea liquid spray gun 31
The urea of penetrating forms urea admixture, enters in the pyrolysis heating tube tube bank 42 of pyrolysis tube bank 4 by flue gas to 350-
650 DEG C, urea resolves into ammonia, and ammonia passes sequentially through pyrolysis tube bank outlet 43, thermal decomposition product convergence pipe 5, sprayed with SCR denitration
Ammonia pipeline is connected.After the heat exchange of pyrolysis heating tube tube bank 42 by urea pyrolysis tube bank 4, flue-gas temperature is dropped from 400-900 DEG C
As low as 350-700 DEG C, continue the heat source as heating air preheat tube bank 22.
Air tube bank 21, air preheat tube bank 22, thermal decomposition tube beam entrance 41, pyrolysis heating tube tube bank 42, pyrolysis are restrained out
The pipe diameter of mouth pipe 43 is 20-80mm.
Embodiment 2：
Refering to what is shown in Fig. 2, the present embodiment is substantially the same manner as Example 1, difference lies in：Thermal decomposition product convergence pipe 5 goes out
Mouth direction is different, and the schematic diagram thermal decomposition product convergence pipe 5 of embodiment 1 is close to air main pipe 2, the schematic diagram pyrolysis production of embodiment 2
Object converges pipe 5 close to pyrolysis installation entrance 11.
As example：
Certain 1000MW grade coal unit boiler draws 7000Nm from the cold First air of boiler3/ h, 30 DEG C of temperature, pressure
The air of 10kPa enters the present apparatus, and 8000Nm is drawn from the low region of crossing of boiler3/ h, 850 DEG C of temperature flue gas enter the present apparatus.
After smoke pre-heating air themperature be 180 DEG C, in 180 DEG C of air spray into urea liquid formed urea admixture after again into
Enter pyrolysis tube bank by flue gas, urea admixture is heated to 600 DEG C, and 850 DEG C of flue gas is by solution heat pipe bundle, air preheat
Temperature is reduced to 400 DEG C after tube bank heat exchange.
Comparative example：
In addition to being not provided with air preheat tube bank, remaining is identical as above-mentioned example, temperature parameter, the First air of air and flue gas
Flow is also same as described above, and boiler First air is introduced into urea jet chamber, then needs draw 850 DEG C of the exhaust gas volumn to be
10000Nm3/h。
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (8)
1. a kind of SCR denitration urea pyrolysis device of flue gas, it is characterised in that：Including pyrolysis installation shell, air preheat
Tube bank, urea liquid jet chamber, pyrolysis heating tube tube bank, pyrolysis installation shell are equipped with smoke inlet and exhanst gas outlet, are being pyrolyzed
Between smoke inlet and exhanst gas outlet in device case, it is equipped with the tube bank of pyrolysis heating tube and air preheat successively along flue gas direction
Tube bank is connected by urea liquid jet chamber between the outlet and the entrance of pyrolysis heating tube tube bank of air preheat tube bank, is urinated
Urea liquid spray gun is equipped in plain solution jet chamber.
2. the SCR denitration urea pyrolysis device of flue gas as described in claim 1, it is characterised in that：Air preheat is restrained
Entrance be connected to one/secondary air channel of boiler.
3. the SCR denitration urea pyrolysis device of flue gas as described in claim 1, it is characterised in that：Pyrolysis installation shell
It is closely coupled with urea liquid jet chamber.
4. the SCR denitration urea pyrolysis device of flue gas as described in claim 1, it is characterised in that：Further include air mother
Pipe and air tube bank, air main pipe are connected with air tube bank, air preheat tube bank successively.
5. the SCR denitration urea pyrolysis device of flue gas as described in claim 1, it is characterised in that：It further include pyrolysis production
Object convergence pipe and pyrolysis tube bank outlet, the tube bank of pyrolysis heating tube are converged directly or by pyrolysis tube bank outlet with thermal decomposition product
Pipe is connected, and thermal decomposition product convergence pipe is connected with the spray ammonia pipeline of SCR denitration device.
6. the SCR denitration urea pyrolysis device of flue gas as described in claim 1, it is characterised in that：Pyrolysis installation shell
It is made of entrance, bringing-up section, outlet section, pyrolysis heating tube is restrained and air preheat tube bank is set in bringing-up section, and is pyrolyzed and is added
Heat pipe tube bank is close to entrance, and air preheat tube bank is close to outlet section.
7. the SCR denitration urea pyrolysis device of flue gas as claimed in claim 6, it is characterised in that：Entrance and boiler
400-900 DEG C of smoke-gas area connection, outlet section are connected with boiler economizer outlet downstream flue.
8. the SCR denitration urea pyrolysis device of flue gas as described in claim 1, it is characterised in that：Air preheat is restrained
Pipe diameter with pyrolysis heating tube tube bank is 20-80mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721595056.1U CN207667444U (en) | 2017-11-24 | 2017-11-24 | A kind of SCR denitration urea pyrolysis device of flue gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721595056.1U CN207667444U (en) | 2017-11-24 | 2017-11-24 | A kind of SCR denitration urea pyrolysis device of flue gas |
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| CN207667444U true CN207667444U (en) | 2018-07-31 |
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| CN201721595056.1U Active CN207667444U (en) | 2017-11-24 | 2017-11-24 | A kind of SCR denitration urea pyrolysis device of flue gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110605022A (en) * | 2019-09-26 | 2019-12-24 | 山东大学 | Reheating desulfurization and denitrification system and desulfurization and denitrification method for tail gas of ship engine |
| CN114876613A (en) * | 2022-05-24 | 2022-08-09 | 安庆船用电器有限责任公司 | Marine urea supply injection apparatus |
-
2017
- 2017-11-24 CN CN201721595056.1U patent/CN207667444U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110605022A (en) * | 2019-09-26 | 2019-12-24 | 山东大学 | Reheating desulfurization and denitrification system and desulfurization and denitrification method for tail gas of ship engine |
| CN114876613A (en) * | 2022-05-24 | 2022-08-09 | 安庆船用电器有限责任公司 | Marine urea supply injection apparatus |
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