CN207313148U - A kind of hydrolysis of urea ammonia reactor of band coupling synergy heat transfer unit (HTU) - Google Patents
A kind of hydrolysis of urea ammonia reactor of band coupling synergy heat transfer unit (HTU) Download PDFInfo
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- CN207313148U CN207313148U CN201721380385.4U CN201721380385U CN207313148U CN 207313148 U CN207313148 U CN 207313148U CN 201721380385 U CN201721380385 U CN 201721380385U CN 207313148 U CN207313148 U CN 207313148U
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- urea
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Abstract
The utility model discloses a kind of hydrolysis of urea ammonia reactor of band coupling synergy heat transfer unit (HTU).Most of domestic hydrolysis of urea reactor carries out indirectly heat using steam pipe coil to urea liquid at present, due to being limited by coil arrangement form and arrangement, frequently result in hydrolysis reactor that urea liquid uneven heating is even, be easy to cause hot-spot or local heating deficiency.The utility model includes reactor shell and heating steam pipe coil；At least one urea liquid distributor and polylith baffle plate are respectively set in the reactor shell lower half of heating steam pipe coil both sides, and the urea liquid distributor is provided with multiple urea liquid spray-holes towards heating steam pipe coil side.The utility model is uniformly heated urea liquid in hydrolysis reactor, enhances hydrolysis reaction system heat and mass efficiency by setting baffle plate and urea liquid distribution pipe in heating steam pipe coil both sides, while can reduce steam consumption quantity, reduces operating cost.
Description
Technical field
Ammonia reactor field processed is the utility model is related to, it is specifically a kind of to be applied to coal-burning power plant's SCR denitrating flue gas
Band coupling synergy heat transfer unit (HTU) hydrolysis of urea ammonia reactor.
Background technology
Nitrogen oxides（NOx）It is one of main atmosphere pollution.With《Fossil-fuel power plant atmospheric pollutant emission standard》
（GB13223-2011）Issue, to coal-fired plant flue gas pollutant NOxEmission limit requirement it is more and more stringenter.Flue gas takes off
Nitre is the effective ways of NOx in control fire coal boiler fume widely used both at home and abroad, and coal-burning power plant's generating set is most
Equipment for denitrifying flue gas is all provided with, first property catalytic reduction method（SCR）It is current most widely used, most mature and reliable, denitration effect
The highest gas denitrifying technology of rate, most fire coal boiler fume denitrations all use the technology in the world at present.And taken off in SCR
Reducing agent employed in nitre technology can select liquefied ammonia, ammonium hydroxide and urea.Since liquefied ammonia is cheap, operating cost is low, early
The SCR denitration device of phase uses liquefied ammonia evaporation technology more, but since liquefied ammonia has toxicity and corrosivity, and it is readily volatilized, exist
Larger security risk, belongs to major hazard source, and transport and storage have special regulation, be subject to stringent control.In ammonium hydroxide
Ammonia density it is relatively low, cost of transportation is high, and has more metal ion in industrial ammonia, has one to the service life of SCR catalyst
Fixed influence, therefore using not extensive in the SCR denitration device of coal fired power plant.Urea is a kind of nontoxic solid
Grain, transport, storage safety convenient, environmental sound.For the consideration of security and practicality, in order to overcome liquefied ammonia transport, unload
The security risks existing for link such as material, storage, operation, maintenance, gradually cause suitable for the urea technique for production of ammonia of SCR denitrating flue gas
The concern of people.The technology of urea ammonia mainly has two kinds of urea pyrolysis and hydrolysis of urea at present.Compared to pyrolysis ammonia, hydrolysis system
More thoroughly, no coupling product produces ammonia process ratio, and energy consumption is small, it is only necessary to which low-grade steam can meet the heat need of hydrolysis
Ask, operating cost is low.
At present, the hydrolysis of urea ammonia reactor that coal-fired plant flue gas denitrating system uses generally uses U-shaped coil pipe steam
The mode of indirectly heat urea liquid, under certain temperature and pressure condition, urea liquid is produced ammonia and dioxy by thermal decomposition
Change carbon, be finally discharged into SCR denitration device from reactor top.At present in the hydrolysis of urea ammonia reactor of actual motion,
Since U-shaped coil pipe generally takes oval column structure type to be arranged in reactor shell center the latter half, urea liquid is from anti-
Answer device bottom to directly input cylinder by pipeline, with steam pipe coil indirect heat exchange, often lead to urea concentration skewness, with
The progress of reaction, the heat exchange non-uniform phenomenon of steam pipe coil is more and more obvious, easily causes urea liquid hot-spot or adds
Hot deficiency, influences the normal operation of reactor, can not be applicable in SCR denitration device load variations, while also cause steam consumption quantity to increase
Greatly.
Utility model content
Technical problem to be solved in the utility model is to overcome existing urea solution to hydrolyze on existing for ammonia reactor processed
State problem, there is provided a kind of hydrolysis ammonia reactor of band coupling synergy heat transfer unit (HTU), it heats steam pipe coil in inside reactor
Both sides set baffle plate and urea liquid distributor, make urea liquid and heating steam pipe coil even heat point in hydrolysis reactor
Cloth, to avoid urea liquid hot-spot is produced or the problems such as underheat, it is ensured that hydrolysis reactor normal operation, reduces heating
The consumption of steam, saves operating cost.
For this reason, the utility model adopts the following technical scheme：A kind of hydrolysis of urea system of band coupling synergy heat transfer unit (HTU)
Ammonia reactor, including reactor shell and heating steam pipe coil；
At least one urea liquid distributor is respectively set in the reactor shell lower half of heating steam pipe coil both sides
With polylith baffle plate, the urea liquid distributor is provided with multiple urea liquid spray-holes towards heating steam pipe coil side.
As the supplement of above-mentioned technical proposal, it is respectively provided with the reactor shell lower half of heating steam pipe coil both sides
At least one urea liquid inlet tube, the urea liquid distributor are connected with corresponding urea liquid inlet tube.
As the supplement of above-mentioned technical proposal, the urea liquid distributor and urea liquid inlet tube are in symmetrically to set
Put, both centre-heights are consistent, and consistent with the heating steam pipe coil centre-height in reactor enclosure body.
As the supplement of above-mentioned technical proposal, the urea liquid distributor is circular or oval stainless steel pipes,
It is closed at both ends；The urea liquid distributor is fixedly connected on baffle plate.
As the supplement of above-mentioned technical proposal, the urea liquid inlet tube quantity is according to the length of urea liquid distributor
Degree, 2-3 is set per side, multiple spacing that adjacent urea liquid inlet tube is formed are aliquoted in urea liquid distributor length respectively
Degree.
As the supplement of above-mentioned technical proposal, the inclined arrangement of the baffle plate, with the horizontal an angle β, 45 °≤
β≤60°。
As the supplement of above-mentioned technical proposal, the quantity of baffle plate according to the length of heating steam pipe coil, at interval of 800 ~
1000mm sets one piece, and both sides are arranged symmetrically, and quantity is equal, and one end of baffle plate is welded in reactor shell.
As the supplement of above-mentioned technical proposal, the reactor shell is cylindrical, and both ends are sealed using ellipse end socket
Close, an end socket is equipped with visor, and heating steam pipe coil insert port is provided with another end socket；The top of the reactor shell is equipped with
Product gas demister and product gas delivery outlet, bottom are equipped with sewage draining exit.
As the supplement of above-mentioned technical proposal, the heating steam pipe coil takes the shape of the letter U cylindric；Heat the one of steam pipe coil
End is inserted in the cylinder that reactor shell lower half surrounds, and the heating steam pipe coil in cylinder is equipped with stent, stent welding
In reactor shell；It is external that the other end of heating steam pipe coil is placed in reactor enclosure, is welded on end socket, and enter equipped with steam
Mouth and steam condensate outlet.
As the supplement of above-mentioned technical proposal, liquid thermometer, gas phase temperature meter, pressure are additionally provided with the reactor shell
Power table, safety valve and liquid level gauge.
The utility model has following beneficial effect：The utility model in hydrolysis ammonia reactor, steam by heating
Vapour coil pipe both sides are provided with baffle plate and urea liquid distributor, pass through urea liquid distributor so that into reactor
Urea liquid distribution is more uniform, then coordinates with baffle plate so that the heat distribution for heating steam pipe coil also tends to uniformly, increase
The heat and mass efficiency of urea liquid hydrolytic process, avoids urea liquid hot-spot or underheat, ensures hydrolysis reactor
Normal operation, improves the demand that hydrolysis reactor adapts to denitrification apparatus load variations, while reduces steam consumption quantity, reduce operation into
This.
Brief description of the drawings
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is the A direction views of Fig. 1；
Fig. 4 is B-B direction sectional view in Fig. 2；
Fig. 5 is the utility model urea liquid distributor perforate schematic diagram；
Fig. 6 is urea concentration distribution schematic diagram in the utility model hydrolysis reactor；
Fig. 7 is heat flux distribution schematic diagram in the utility model hydrolysis reactor；
Fig. 8 is the top view of Fig. 7；
Fig. 9 is the A direction views of Fig. 7.
Wherein：1 is reactor shell；2 be heating steam pipe coil；3 be product gas demister；4 be product gas delivery outlet；5
For steam inlet；6 export for steam condensate；7 be sewage draining exit；8 be urea liquid distributor；9 be urea liquid inlet tube；10 are
Baffle plate；11 be visor；12 be stent；13 be urea liquid spray-hole.
Embodiment
A preferred forms of the utility model are provided with reference to Figure of description.
The hydrolysis ammonia reactor of band coupling synergy heat transfer unit (HTU) as shown in Figs 1-4, it is by reactor shell 1, heating
Steam pipe coil 2, baffle plate 10 and urea liquid distributor 8 form.Reactor shell 1 is cylindrical, and both ends are sealed using ellipse
Head closing.Two side lower part of reactor shell is equipped with urea liquid inlet tube 9, and top is equipped with product gas demister 3 and product gas is defeated
Outlet 4, bottom is equipped with sewage draining exit 7.One of two end sockets is equipped with visor 11, another is equipped with the insertion of heating steam pipe coil
Mouthful.
Heating steam pipe coil 2 takes the shape of the letter U cylindric.One end of steam pipe coil 2 is heated from reactor shell lower half centre bit
Put and insert in the cylinder that reactor shell surrounds, the heating steam pipe coil in cylinder is equipped with stent 12, and stent 12 is welded on reaction
On device housing 1；The other end of heating steam pipe coil 2 is placed in outside reactor, is welded on end socket, and equipped with steam inlet 5 and is steamed
Vapour condensate outlet 6.
Baffle plate 10 is welded on the housing 1 of reactor shell lower half steam pipe coil both sides, and baffle plate 10 is in tilted layout,
With the angle of horizontal plane：45º≤β≤60º.
Urea liquid distributor 8 uses circular or oval stainless steel pipes, closed at both ends, towards heating steam pipe coil side
Urea liquid spray-hole 13 is provided with, as shown in Figure 5.Urea liquid distributor 8 is arranged symmetrically in reactor lower half heating steam
2 both sides of coil pipe, are fixed on both sides baffle plate 10.
The setting quantity of baffle plate 10 according to heating steam pipe coil 2 length, at interval of 800 ~ 1000mm set one piece, two
Side is arranged symmetrically, and quantity is equal, and one end is welded in reactor shell 1.The height of baffle plate 10（Upper surface）With heating steam disc
2 centre-height of pipe is consistent.
Urea liquid distributor 8 is connected with the urea liquid inlet tube 9 set in reactor shell 1, both sides urea liquid
Inlet tube 9 is arranged symmetrically as urea liquid distributor 8, both centre-heights are consistent, and with heating steam pipe coil 2 in cylinder
Centre-height is consistent.1 both sides urea liquid inlet tube of reactor shell, 9 quantity is according to the length of urea liquid distributor 8, every side
2 ~ 3 are set respectively, it is believed that multiple spacing that two urea liquid inlet tubes are formed are aliquoted in 8 pipeline of urea liquid distributor length
Degree.
The course of work of the utility model is as follows：Urea liquid is delivered to urea liquid point by urea liquid inlet tube 9
Orchestration 8, evenly distributes to hydrolysis reactor housing 1 through urea liquid distributor, and urea liquid is dense in hydrolysis reactor
Degree distribution is as shown in Figure 6.After urea liquid reaches certain liquid level in question response device, the steam of heating by steam inlet 5 into
Enter to heat steam pipe coil 2, between heating steam pipe coil 2 urea liquid relatively low with temperature contacts, vapor (steam) temperature constantly reduces, finally
Reach condensation temperature, release condensation latent heat, steam becomes condensation water, liberated heat heating urea solution.Due to baffle plate 10
Set, acted on plus the urea liquid flow-disturbing that urea liquid distributor 8 ejects so that heating steam pipe coil in hydrolysis reactor
The distribution of 2 ambient heats progressively tends to be uniform, and heat flux distribution is as Figure 7-9 in hydrolysis reactor.It is molten in baffle plate 10 and urea
Under the double action of liquid distributor 8, the heat and mass efficiency in hydrolysis reaction is enhanced.Reach specific temperature and pressure
Condition, hydrolysis reaches optimum speed, reaction production ammonia and carbon dioxide, and carries a part of water vapour secretly from hydrolysis
Enter product gas demister 3 at the top of device, being delivered to SCR from product gas delivery outlet again after demister removes most of water mist drop takes off
Nitre device.Hydrolysis reactor can periodically exclude the impurity such as the biuret produced in hydrolytic process by sewage draining exit, be examined shutting down
Process is repaiied, the liquid in hydrolysis reactor can be emptied.Visor, thermometer, pressure gauge, the safety valve set in reactor shell
And the monitoring device such as liquid level gauge and equipment are mainly used for monitoring the various parameters in hydrolysis reaction, to ensure hydrolysis
Device normal operation under the operating mode of design.
As described above, although the utility model has been represented and expressed with reference to specific preferred embodiment, but it must not
It is construed to the limitation to the utility model itself.The spirit and model of the utility model that the appended claims define are not being departed from
, can various changes can be made in the form and details to it under the premise of enclosing.
Claims (10)
1. a kind of hydrolysis of urea ammonia reactor of band coupling synergy heat transfer unit (HTU), including reactor shell (1) and heating steam
Coil pipe (2), it is characterised in that
At least one urea liquid is respectively set to distribute in reactor shell (1) lower half of heating steam pipe coil (2) both sides
Device (8) and polylith baffle plate (10), the urea liquid distributor (8) are provided with multiple urine towards heating steam pipe coil (2) side
Plain solution spray-hole (13).
2. hydrolysis of urea ammonia reactor according to claim 1, it is characterised in that positioned at heating steam pipe coil (2) two
At least one urea liquid inlet tube (9), the urea liquid distributor (8) are respectively provided with the reactor shell lower half of side
Connected with corresponding urea liquid inlet tube (9).
3. hydrolysis of urea ammonia reactor according to claim 2, it is characterised in that the urea liquid distributor
(8) be symmetrical set with urea liquid inlet tube (9), both centre-heights are consistent, and with reactor enclosure body plus
Hot steam coil pipe (2) centre-height is consistent.
4. hydrolysis of urea ammonia reactor according to claim 2, it is characterised in that the urea liquid inlet tube (9)
Quantity sets 2-3 per side according to the length of urea liquid distributor (8) respectively, what adjacent urea liquid inlet tube (9) was formed
Multiple spacing are aliquoted in urea liquid distributor (8) length.
5. according to claim 1-4 any one of them hydrolysis of urea ammonia reactors, it is characterised in that the urea liquid
Distributor (8) is circular or oval stainless steel pipes, closed at both ends；The urea liquid distributor (8) is fixedly connected on
On baffle plate (10).
6. according to claim 1-4 any one of them hydrolysis of urea ammonia reactors, it is characterised in that the baffle plate
(10) inclined arrangement, with the horizontal an angle β, 45 °≤β≤60 °.
7. according to claim 1-4 any one of them hydrolysis of urea ammonia reactors, it is characterised in that the number of baffle plate (10)
Amount sets one piece, both sides are arranged symmetrically, and quantity is equal, baffling according to the length of heating steam pipe coil at interval of 800 ~ 1000mm
One end of plate (10) is welded in reactor shell (1).
8. hydrolysis of urea ammonia reactor according to claim 1 or 2, it is characterised in that the reactor shell (1)
Cylindrical, both ends are closed using ellipse end socket, and an end socket is equipped with visor (11), heating steam disc is provided with another end socket
Pipe insert port；The top of the reactor shell (1) is equipped with product gas demister (3) and product gas delivery outlet (4), and bottom is equipped with
Sewage draining exit (7).
9. hydrolysis of urea ammonia reactor according to claim 8, it is characterised in that the heating steam pipe coil (2)
Take the shape of the letter U cylindric；In the cylinder that one end intercalation reaction device housing lower half of heating steam pipe coil surrounds, adding in cylinder
Hot steam coil pipe is equipped with stent (12), and stent (12) is welded in reactor shell (1)；Heat the other end of steam pipe coil (2)
It is placed in reactor shell (1) outside, is welded on end socket, and equipped with steam inlet (5) and steam condensate outlet (6).
10. according to claim 1-4 any one of them hydrolysis of urea ammonia reactors, it is characterised in that the reactor enclosure
Liquid thermometer, gas phase temperature meter, pressure gauge, safety valve and liquid level gauge are additionally provided with body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721380385.4U CN207313148U (en) | 2017-10-24 | 2017-10-24 | A kind of hydrolysis of urea ammonia reactor of band coupling synergy heat transfer unit (HTU) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721380385.4U CN207313148U (en) | 2017-10-24 | 2017-10-24 | A kind of hydrolysis of urea ammonia reactor of band coupling synergy heat transfer unit (HTU) |
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| Publication Number | Publication Date |
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| CN207313148U true CN207313148U (en) | 2018-05-04 |
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| CN201721380385.4U Active CN207313148U (en) | 2017-10-24 | 2017-10-24 | A kind of hydrolysis of urea ammonia reactor of band coupling synergy heat transfer unit (HTU) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111215010A (en) * | 2020-02-27 | 2020-06-02 | 东方电气集团东方锅炉股份有限公司 | Urea hydrolysis reactor utilizing hydrophobic waste heat and urea hydrolysis method thereof |
-
2017
- 2017-10-24 CN CN201721380385.4U patent/CN207313148U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111215010A (en) * | 2020-02-27 | 2020-06-02 | 东方电气集团东方锅炉股份有限公司 | Urea hydrolysis reactor utilizing hydrophobic waste heat and urea hydrolysis method thereof |
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