CN110422860A - A kind of hydrolysis of urea ammonia reaction unit - Google Patents
A kind of hydrolysis of urea ammonia reaction unit Download PDFInfo
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- CN110422860A CN110422860A CN201910641660.0A CN201910641660A CN110422860A CN 110422860 A CN110422860 A CN 110422860A CN 201910641660 A CN201910641660 A CN 201910641660A CN 110422860 A CN110422860 A CN 110422860A
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- urea
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- 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
Abstract
The application provides a kind of hydrolysis of urea ammonia reaction unit.The hydrolysis of urea ammonia reaction unit includes: reactor, for providing reacting environment for urea liquid to be hydrolyzed；Heating component, with the heating part being located in the reactor to heat the urea liquid, the interface that the heating part is in contact with the urea liquid has ripple type curved surface, the ripple type curved surface includes several spaced lug bosses and several spaced recessed portions, and the lug boss and the recessed portion are sequentially connected with to form smooth curved surface；Urea liquid circulation line, one end is connect with the urea liquid loop exit of the reactor, the other end is connect with the urea liquid loop head of the reactor, and the impurity in urea liquid is reduced while increasing heat exchange efficiency in heating component surface scale, reduces cleaning and maintenance cost.
Description
Technical field
The present invention relates to gas denitrifying technology fields, and in particular to a kind of hydrolysis of urea ammonia reaction unit.
Background technique
The SCR technology principle of coal fired power plant is under the conditions of 300-400 DEG C of temperature, using ammonia as reducing agent and nitrogen oxidation
Catalytic reduction reaction occurs for object, generates the nitrogen and water nontoxic to environment.Therefore, ammonia is prepared into SCR denitration
An important link, the preparation method of ammonia becomes the crucial research contents of this field.Ammonia preparation method mainly has liquid
Ammonia process, Ammonia Process and urea method.Liquefied ammonia be it is flammable and toxic, be easy to happen explosion, use more than 40t, that is, may make up great
Danger source；Ammonia Process needs to evaporate a large amount of water, and energy consumption is high, and storage and transportation and transportation cost are highest, and the metal in ammonium hydroxide
Ion can shorten catalyst life；Urea is a kind of stabilization, nontoxic solid particle, and transport and storage do not need particular/special requirement,
It is the ideal method of ammonia processed, therefore urea decomposes Ammonia Process and is increasingly being applied in Flue Gas Denitrification Engineering.
Urea method is divided into urea pyrolysis method and ureal antigen, and urea pyrolysis method energy consumption is high, relative to urea pyrolysis method, urine
Thermal energy needed for plain hydrolytic process is low-grade steam, and operating cost is low, and energy consumption is small, and economy is higher.Hydrolysis of urea system
Ammonia reactor is the core equipment in the entire technique of hydrolysis of urea, primarily now in technology using tank reactor,
If Chinese patent literature (CN201978740U) discloses a kind of urea liquid hydrolysis ammonia tank reactor processed, mainly by horizontal length
Cartridge type reaction kettle and several U-shaped heat exchange coils being arranged in inside horizontal long cartridge type reaction kettle and setting are in horizontal long cylinder
Product gas outlet pipe and urea liquid on type reaction kettle outer wall are injected into material mouth composition.Horizontal long cartridge type inside reactor investment
Urea liquid, the U-shaped heat exchange coil tube bank as heating component are dipped in urea liquid, and high-temperature steam, urea liquid are walked in pipe
In the interbank heated hydrolysis carbon dioxide of U-shaped heat exchange coil and ammonia.The heating component in hydrolysis of urea ammonia reactor
Heating efficiency directly affects the hydrolysis efficiency of urea, and then influences the generation efficiency of ammonia, reacts at present in hydrolysis of urea ammonia
Heating component in device uses the straight tube heat exchanger tube of smooth surface mostly, since its internal-and external diameter does not change, for the shell that exchanges heat
The urea liquid of journey and the vapor of tube side do not disturb, cause the pipe two sides coefficient of heat transfer low, especially for the urine of shell side
For plain solution, it is substantially at stationary state, largely affects overall heat exchange efficiency.Corrugated tube has due to its surface
There is ripple, increase heat exchange area compared to straight tube heat exchanger tube, and increase the disturbance to medium, therefore can be improved heat exchange effect
Rate, but inventors have found that the ripple comparatively dense of bellows in the prior art, is directly connected to, phase by multiple wave duct sections
The part to connect between adjacent two wave duct sections forms dead zone, be used for the heating component of hydrolysis of urea ammonia reactor when
It waits, the impurity or side reaction product in urea liquid are very easy to put aside in the dead zone between wave duct section, increase cleaning and dimension
Cost is protected, to introduce the technical issues of heating component outer surface is easy incrustation while solving heat transfer problem.
Summary of the invention
Therefore, the technical problem to be solved in the present invention is that overcoming in the prior art for uremic hydrolysis ammonia reactor processed
Heating component can not solve the defect that heat transfer problem and outer surface are easy fouling problem simultaneously, to provide a kind of new urea
Hydrolyze ammonia reaction unit processed.
A kind of hydrolysis of urea ammonia reaction unit, comprising:
Reactor, for providing reacting environment for urea liquid to be hydrolyzed；
Heating component has and is located in the reactor to the heating part for heating the urea liquid, the heating part
The interface being in contact with the urea liquid has ripple type curved surface, and the ripple type curved surface includes several spaced protrusions
Portion and several spaced recessed portions, the lug boss and the recessed portion are sequentially connected with to form smooth curved surface；
Urea liquid circulation line, one end are connect with the urea liquid loop exit of the reactor, the other end and institute
State the urea liquid loop head connection of reactor.
Further, the distance between vertex of adjacent projections is 3-10cm, between the bottom point of adjacent depression away from
From for 3-15cm.
Further, the heating component is U-shaped, and the open end of U-shaped heating component is located at outside the reactor, silent
End is located at the inside reactor.
Further, the heating component is several U-tubes, and the U-tube includes straight pipe and bend loss, the straight tube
The outer surface of section has the ripple type curved surface.
Further, the U-tube includes the first open end and the second open end, first open end and heat medium
Introduction chamber connection, second open end is connected to heat medium export cavity.
Further, circulating pump is provided on the urea liquid circulation line.
Further, filter is provided on the urea liquid circulation line.
Further, liquid distributor is provided on the reactor, the liquid distributor and the urea liquid loop head connect
It connects, and the mouth spray of the liquid distributor is located at the inside reactor.
Further, the reactor includes cylinder and the end socket that the cylinder both ends are arranged in, and is arranged on the end socket
There are flange, the heating component and the flanged joint.
Further, gas-liquid separation device is provided on the reactor, the gas-liquid separation device includes being sequentially connected
Guide shell, venturi type demister and mesh mist eliminator, the guide shell is connected to the inside of the reactor.
Further, the guide shell includes the inner cylinder of outer cylinder and setting portion in the outer cylinder, the outer cylinder and inner cylinder
Between and the inside of the inner cylinder be provided with rotating flow guidance blade.
Technical solution of the present invention has the advantages that
1. hydrolysis of urea ammonia reaction unit provided by the invention, including reactor, heating component and urea liquid circulation
Pipeline, it is ripple type curved surface that wherein heating component, which is located at the interface that the heating part in reactor is in contact with urea liquid, by convex
The portion of rising and recessed portion are sequentially connected with to form smooth curved surface, and the distance between vertex of adjacent projections is 3-10cm, adjacent recessed
Heat transfer effect is best when the distance between bottom point of concave portion is 3-15cm, avoids the dead zone that easy fouling is formed in heating component,
So that effectively reducing impurity in urea liquid or side reaction product while increasing heat exchange efficiency on heating component surface
Fouling reduces cleaning and maintenance cost；The urea liquid in reactor is extracted out by setting circulation line and returns to reaction
In device, increase the disturbance of urea liquid in reactor, cooperates above-mentioned smooth ripple type curved surface, on the one hand increase heating component
Heat exchange efficiency, on the other hand due to disturbing the hydrolysis for promoting the gas in solution to escape further promotion urea, it is most important that,
Urea liquid can also acutely be disturbed by circulation line to further avoid the fouling of heating component outer surface.
2. hydrolysis of urea ammonia reaction unit provided by the invention, can be by hydrolysis of urea by setting gas-liquid separation device
The gas of generation and the drop separation of entrainment, make in the urea liquid in drop Returning reactor, purify product gas, while making to make
For the water Returning reactor of reactant, further promote the hydrolysis of urea, improves ammonia generation efficiency.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of hydrolysis of urea ammonia reaction unit in the embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of heat exchanger tube in the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another heat exchanger tube in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of liquid distributor in the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of gas-liquid separation device in the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of venturi type demister in the embodiment of the present invention.
Appended drawing reference:
1- reactor；The heating part 2-；3- lug boss；4- recessed portion；5- urea liquid circulation line；6- urea liquid circulation
Outlet；7- straight pipe；8- bend loss；The first open end 9-；The second open end 10-；11- heat medium introduction chamber；12- heating is situated between
Matter export cavity；13- heat medium ingress pipe；14- heat medium delivery line；15- inner surface；The outer surface 16-；17- cylinder；18-
End socket；181- flange；19- urea liquid inlet；20- urea liquid inlet tube；21- demineralized water inlet tube；22- circulating pump；
231- coarse filter；232- fine filter；24- liquid distributor；25- mouth spray；26- liquid back pipe；27- liquid distributor supervisor；28- supervisor
Inlet；29- gas-liquid separation device；30- guide shell；31- venturi type demister；32- mesh mist eliminator；33- product conductance
Part out；34- product gas outlet；35- safety exhaust pipeline；36- product gas gas exhaust piping；37- safety exhaust；38- product gas
Exhaust valve；39- sewage draining exit；40- blowoff line.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " on ", "lower", "left", "right", "vertical", "horizontal",
The orientation or positional relationship of the instructions such as "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of retouching
It states the present invention and simplifies description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with specific
Orientation construction and operation, therefore be not considered as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
As shown in Figure 1, the embodiment of the present application provides a kind of hydrolysis of urea ammonia reaction unit, comprising:
Reactor 1, for providing reacting environment for urea liquid to be hydrolyzed；
Heating component has the heating part 2 being located in reactor 1 to heating urea solution, heating part 2 and urea liquid
The interface being in contact has ripple type curved surface, and as shown in Figures 2 and 3, ripple type curved surface includes several spaced lug bosses 3
With several spaced recessed portions 4, lug boss 3 and recessed portion 4 are sequentially connected with to form smooth curved surface, wherein adjacent protrusion
The distance between the vertex in portion 3 is 3-10cm, and the distance between bottom point of adjacent depression 4 is 3-15cm；
Urea liquid circulation line 5, one end are connect with the urea liquid loop exit 6 of reactor 1, the other end with react
The urea liquid loop head of device 1 connects.
Hydrolysis of urea ammonia reaction unit provided by the invention, including reactor 1, heating component and urea liquid circulation pipe
Road 5, it is ripple type curved surface that wherein heating component, which is located at the interface that the heating part 2 in reactor 1 is in contact with urea liquid, by convex
It plays portion 3 and recessed portion 4 is sequentially connected with to form smooth curved surface, the distance between vertex of adjacent projections 3 is 3-10cm, adjacent
Heat transfer effect is best when the distance between bottom point of recessed portion 4 is 3-15cm, avoids forming the dead of easy fouling in heating component
Area, so that effectively reducing impurity in urea liquid or side reaction product while increasing heat exchange efficiency in heating component table
Face fouling, reduces cleaning and maintenance cost；The urea liquid in reactor 1 is extracted out by setting circulation line and is returned anti-
It answers in device 1, increases the disturbance of urea liquid in reactor 1, cooperate above-mentioned smooth ripple type curved surface, on the one hand increase heating group
The heat exchange efficiency of part, it is most important on the other hand due to disturbing the hydrolysis for promoting the gas in solution to escape further promotion urea
Be, moreover it is possible to urea liquid is acutely disturbed by circulation line to further avoiding the fouling of heating component outer surface.
As a kind of specific embodiment of heating component, heating component be it is U-shaped, the open end of U-shaped heating component is located at
Outside reactor 1, closed end is located inside reactor 1.The heating component can be electrical heating elements or heat exchanger tube, closed end
The as one end of the U-shaped heating component with bending section, open end is then one end of U-shaped opening, and open end is located at outside reactor 1
Portion is for being electrical heating elements connection power supply or being that heat exchanger tube is passed through and exports heat medium.Specifically, if heating component is
Dry U-tube, U-tube include straight pipe 7 and bend loss 8, and the outer surface of straight pipe 7 has ripple type curved surface.U-tube includes first
Open end 9 and the second open end 10, the first open end 9 are connected to heat medium introduction chamber 11, to import heating into U-tube
Medium, the second open end 10 is connected to heat medium export cavity 12, to export heat medium.As shown in Figure 1, and heating component
Connected heat medium in-out apparatus, the heat medium in-out apparatus are large diameter pipeline, internal to be divided into heating Jie by partition
Matter introduction chamber 11 and heat medium export cavity 12, heat medium introduction chamber 11 are connected with heat medium ingress pipe 13, to adding
Heat medium is imported in thermal medium introduction chamber 11, heat medium export cavity 12 is connected with heat medium delivery line 14, will add
Heat medium discharge in thermal medium export cavity 12, specifically, heat medium can use high-temperature steam, when heat medium is discharged
As condensed water.
As another specific embodiment of heating component, which is several straight tube (not shown)s, should
Straight tube penetrates through reactor 1, is entered by one end of reactor 1, and be pierced by by the other end, then heat medium introduction chamber 11 and heating are situated between
Matter export cavity 12 is then divided into the both ends of reactor 1.Such as horizontal reactor 1, heating component penetrates through a left side for reactor 1
Right both ends, heat medium introduction chamber 11 are located at the left end of horizontal reactor 1, and heat medium export cavity 12 is located at horizontal reactor 1
Right end.
As the specific embodiment of above-mentioned heating part 2, which can be annular corrugated or helical corrugation.
As shown in Fig. 2, the straight pipe 7 of heating component U-tube can be rigid to manage the thin-walled of inside and outside shape consistent (being ripple type curved surface)
Property round tube, high-temperature steam is walked in pipe when use；As shown in figure 3, the another of straight pipe 7 as heating component U-tube is implemented
Mode, pipe internal surface 15 are smooth straight face, and tube outer surface 16 is annular corrugated curved surface or helical corrugation curved surface, heating group
The slippery inner surface 15 of part U-tube can guarantee that steam condensate (SC) smoothly flows out, and avoid passing through the wave of outer tube surface 16 in pipe internal water accumulation
Line increases heat exchange area and heat exchange efficiency.
The material of above-mentioned heating component can select carbon steel, low-alloy steel, stainless steel, copper, corronil, aluminium alloy,
Titanium etc..
It can be horizontal reactor 1, vertical reactor 1 etc. as the specific embodiment of reactor 1.It is preferably sleeping
Formula is provided with flange on end socket 18 as shown in Figure 1, reactor 1 includes cylinder 17 and the end socket 18 that 17 both ends of cylinder are arranged in
181, heating component is connect with flange 181.Heating component and flange 181 are tightly connected.Flange 181 adds including what is be detachably connected
Hot component flange and cover flange, wherein heating component flange is fixedly connected with heating component, cover flange and the fixed company of end socket
It connects, heating component flange can be dismantled with cover flange, heating component can be taken out when needing to clean and replacing heating component
Out, convenient for operation.Specifically, above-mentioned heating component is inserted into the 1/2-3/4 that the length in reactor 1 is 1 length of reactor, adds
The height of hot component is the 1/3-1/2 of 17 diameter of cylinder.
Specifically, urea liquid inlet 19 is offered on cylinder 17, urea liquid inlet 19 is connected with urea buffering
Tank (not shown), urea liquid are filled in urea surge tank by urea liquid inlet tube 20, and demineralized water is by demineralized water feed liquor
Pipe 21 is filled in urea surge tank, and urea liquid and demineralized water are sufficiently mixed in urea surge tank, after through urea liquid into
Liquid mouth 19 is filled in reactor 1.
As the further improvement of urea liquid circulation line 5,22 He of circulating pump is provided on urea liquid circulation line 5
Filter 23.Specifically, coarse filter 231 is set in 22 entrance of circulating pump, exports setting fine filter 232 in circulating pump 22,
Coarse filter 231 and fine filter 232 are all made of ladder-form filter 23, the filter of the strainer of fine filter 232 than coarse filter 231
Net is closeer.Primary filtration is carried out by coarse filter 231, filters out the large granular impurity in urea liquid first, is avoided to following
Ring pump 22 and subsequent pipeline damage, and fine filter 232 carries out further refined filtration to the urea liquid of primary filtration, further
The impurity in the urea liquid in Returning reactor 1 is reduced, the deposition of heating component surface impurity is also avoided.
Above-mentioned urea liquid loop head can be provided on reactor 1, and urea liquid circulation line 5 is molten by the urea
Liquid loop head is directly connected to inside reactor 1.As further improvement of this embodiment, cloth liquid is provided on reactor 1
Device 24, liquid distributor 24 are connect with urea liquid loop head, and the mouth spray 25 of liquid distributor 24 is located inside reactor 1.It is preferred that
Ground, urea liquid loop exit 6 are provided on the end socket 18 for being not connected to heating component one end, and urea liquid circulation line 5 is returning
The one end for returning urea liquid is divided into two liquid back pipes 26, and two liquid back pipes 26 are respectively connected to the cloth on 1 ontology of reactor
Liquid device 24 enters urea liquid all the way and is arranged in the liquid distributor 24 of heating component bottom, and another way, which enters, does not arrange heating
The bottom of the reactor 1 of component.The nozzle that then liquid back pipe 26 is connected with liquid distributor 24 is urea liquid loop head.Urea is molten
It is respectively provided with valve on liquid circulation line 5 and liquid back pipe 26, is flexibly controlled with the liquid that returns to urea liquid circulation line 5.It needs
It is noted that the quantity of liquid distributor 24 is not limited to 2, single liquid distributor 24,24 or more cloth liquid of double liquid distributors may be arranged to
Device 24 is arranged in the central location of 17 bottom of cylinder when being set as single liquid distributor 24, when being arranged as double liquid distributors 24
When, by its 17 bottom symmetrical of cylinder be arranged, it is above within the scope of the present application.Above-mentioned liquid distributor 24 is selected
Liquid distributor 24 in the prior art, liquid distributor 24 as shown in Figure 4, including a liquid distributor supervisor 27, liquid distributor supervisor 27 are logical
It crosses supervisor's inlet 28 to be connected with liquid back pipe 26, mouth spray 25 is arranged in sequence on liquid distributor supervisor 27, liquid is through being responsible for feed liquor
Mouth 28 enters spouting through multiple mouth sprays 25 after liquid distributor is responsible for 27.The liquid distributor 24 can be integrally located in reactor 1,
Supervisor's inlet 28 can also be arranged on the barrel of 1 cylinder 17 of reactor, mouth spray 25 and liquid distributor supervisor 27 are then located at instead
It answers inside device 1.
As the further improvement of the embodiment of the present application, gas-liquid separation device 29, gas-liquid separation are additionally provided on reactor 1
It is connected to inside device 29 and reactor 1.The gas that hydrolysis of urea can be generated by setting gas-liquid separation device 29 and entrainment
Drop separation, make in the urea liquid in drop Returning reactor 1, purify product gas, while return the water as reactant
Reactor 1 is returned, the hydrolysis of urea is further promoted, improves ammonia generation efficiency.Gas-liquid separation device 29 can be selected existing
One of technology demister can also be the combination of several demisters.Preferably, as shown in figure 5, gas-liquid separation device 29 wraps
Sequentially connected guide shell 30, venturi type demister 31 and mesh mist eliminator 32 are included, guide shell 30 is connect with reactor 1, silk
It is also equipped on net demister 32 for product gas derived from product gas to be exported part 33, is offered on product gas export part 33
Product gas outlet 34.It is rectified by the mixed gas of the entrained drip escaped in reactor 1 through guide shell 30, keeps mixed gas uniform
Ground enters in the venturi type demister 31 connecting with guide shell 30, and the big drop in mixed gas is tentatively removed through guide shell 30
And in Returning reactor 1, venturi type demister 31 further removes the drop in mixed gas, and with venturi type demisting
The mesh mist eliminator 32 that device 31 connects can further remove droplet remaining in mixed gas, finally obtained product gas warp
The product gas outlet 34 of product gas export part 33 escapes on mesh mist eliminator 32.Specifically, venturi type demister 31 is using existing
There is the venturi type demister in technology, as shown in fig. 6, arrow is oriented to gas flow direction in figure.Guide shell 30 includes outer
Cylinder and the inner cylinder that outer barrel is arranged in, are provided with rotating flow guidance blade between outer cylinder and inner cylinder and inside inner cylinder.Rotation
The mixed gas for entering guide shell 30 is changed into rotation by vertical upflow and flowed up by guide vane, presss from both sides in mixed gas
The drop of band is got rid of under the action of the centrifugal force to inner barrel and outer barrel wall surface, and double-barrel structure considerably reduces drag losses, is had
The removing area for improving to effect mixed gas and entrained drip, removes big drop from guide shell 30.As gas-liquid separation
The inner barrel and outer barrel top of a kind of specific embodiment of device 29, guide shell 30 is concordant, and outer cylinder height is 100mm, and inner cylinder is high
Degree is slightly below outer cylinder, and the height of venturi type demister 31 is 300mm, and the height of mesh mist eliminator 32 is 100mm, mixed gas
After above-mentioned gas-liquid separation device 29, droplet content can be down to 10mg/nm3Hereinafter, drop removal effect is significant.
The said goods gas outlet 34, is connected with safety exhaust pipeline 35 and product gas gas exhaust piping 36, in blow-off pipe
It is provided with safety exhaust 37 on road 35, product gas exhaust valve 38 is provided on product gas gas exhaust piping 36.In reactor 1
Service pressure range is 0.2-0.8MPa, when operating pressure is higher than 0.8MPa in reactor 1, opens product gas exhaust valve
38 product gas is discharged, if operating pressure is more than preset pressure threshold value in reactor 1, safety exhaust 37 is automatically turned on, will
Product gas is discharged to reduce the pressure in reactor 1, avoids hypertonia from generating dangerous.
As the further improvement of the embodiment of the present application, several sewage draining exits 39 are offered on reactor 1, sewage draining exit 39 connects
Blowoff line 40, for the pollutant in urea liquid to be discharged.Since hydrolysis of urea can generate other side reactions in the process, or
Since urea liquid purity is not high, the pollutants such as impurity after long-play in side reaction product or urea liquid can be gathered in
In reactor 1, therefore sewage draining exit 39 is set so that above-mentioned pollutant to be discharged.Preferably, in the envelope for being not provided with heat-exchanging tube bundle one end
On first 18 and 17 bottom of cylinder opens up sewage draining exit 39.
The working principle of above-mentioned hydrolysis of urea ammonia reaction unit is as follows:
Urea and water are dissolved in dissolving tank, are configured to the urea liquid of 30%-60% mass concentration, dissolving tank setting
Heat tracing, operating temperature are 50 DEG C；Urea surge tank, urea buffering are pumped into urea dissolution pump after completely dissolution to urea
It is filled with demineralized water in tank, is pumped into and reacts through urea liquid inlet 19 by urea liquid delivery pump after being sufficiently mixed with urea liquid
In device 1；Urea liquid packed height is about the half of 17 height of cylinder, and floods heating component, and flooding height is about 10cm；It is high
The warm heated medium ingress pipe 13 of steam enters heat medium introduction chamber 11, and the first opening for passing through each U-tube of heating component
End 9 enters U-tube, and the urea liquid in reactor 1 is heated to 130-180 DEG C, becomes condensed water after high-temperature steam heat exchange,
The second open end 10 through each U-tube is expelled to heat medium export cavity 12, and heated medium delivery line 14 is expelled to reheating
Device generates high-temperature steam and is recycled；Urea liquid heating generates the mixed gas of ammonia and carbon dioxide, on reactor 1
The space in portion, and the drop removed in mixed gas is filled via gas-liquid separation, mixed gas passes sequentially through guide shell 30, venturi
Formula demister 31 and mesh mist eliminator 32, are down to 10mg/nm for droplet content3Below；1 service pressure range of reactor is
0.2-0.8MPa, when operating pressure is higher than 0.8MPa in reactor 1, opening product gas exhaust valve 38 will fill by gas-liquid separation
It sets the product gas that 29 obtain and is expelled to tourie absorption, if operating pressure is more than preset pressure threshold value in reactor 1, safety is arranged
Air valve 37 automatically turns on, and product gas is discharged to reduce the pressure in reactor 1, avoids hypertonia from generating dangerous；It crosses herein
The urea liquid circulating pump 22 on urea liquid circulation line 5 is opened in journey, by the urea liquid in reactor 1 through coarse filter
231, reactor 1 is back to by liquid distributor 24 by two liquid back pipes 26 after urea liquid circulating pump 22, fine filter 232
The urea liquid in reactor 1 is caused to disturb to wash away heating component in bottom；Side reaction produces after long-play
The pollutants such as the impurity in object or urea liquid are discharged through sewage draining exit 39, blowoff line 40.
Obviously, the above embodiments are merely examples for clarifying the description, and does not limit the embodiments.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of variation or
It changes.There is no necessity and possibility to exhaust all the enbodiments.And it is extended from this it is obvious variation or
It changes still within the protection scope of the invention.
Claims (10)
1. a kind of hydrolysis of urea ammonia reaction unit characterized by comprising
Reactor (1), for providing reacting environment for urea liquid to be hydrolyzed；
Heating component has and is located in the reactor (1) to the heating part (2) for heating the urea liquid, the heating
The interface that portion (2) is in contact with the urea liquid has ripple type curved surface, and the ripple type curved surface includes several interval settings
Lug boss (3) and several spaced recessed portions (4), the lug boss (3) and the recessed portion (4) are sequentially connected with to be formed
Smooth curved surface；
Urea liquid circulation line (5), one end are connect with the urea liquid loop exit (6) of the reactor (1), the other end
It is connect with the urea liquid loop head of the reactor (1).
2. hydrolysis of urea ammonia reaction unit according to claim 1, which is characterized in that the heating component is U-shaped, U
The open end of type heating component is located at the reactor (1) outside, and it is internal that closed end is located at the reactor (1).
3. hydrolysis of urea ammonia reaction unit according to claim 1 or 2, which is characterized in that if the heating component is
Dry U-tube, the U-tube include straight pipe (7) and bend loss (8), and the outer surface of the straight pipe (7) has the ripple type
Curved surface.
4. hydrolysis of urea ammonia reaction unit according to claim 3, which is characterized in that the U-tube is opened including first
Mouth end (9) and the second open end (10), first open end (9) are connected to heat medium introduction chamber (11), and described second opens
Mouth end (10) is connected to heat medium export cavity (12).
5. hydrolysis of urea ammonia reaction unit according to claim 1 to 4, which is characterized in that the urea liquid follows
Circulating pump (22) are provided on endless tube road (5).
6. -5 any hydrolysis of urea ammonia reaction unit according to claim 1, which is characterized in that the urea liquid follows
Filter (23) are provided on endless tube road (5).
7. -6 any hydrolysis of urea ammonia reaction unit according to claim 1, which is characterized in that on the reactor 1
It being provided with liquid distributor (24), the liquid distributor (24) connect with the urea liquid loop head, and the liquid distributor (24)
It is internal that mouth spray (25) is located at the reactor (1).
8. -7 any hydrolysis of urea ammonia reaction unit according to claim 1, which is characterized in that the reactor (1)
Including cylinder (17) and the end socket (18) at the cylinder (17) both ends is set, is provided with flange (181) on the end socket (18),
The heating component is connect with the flange (181).
9. -8 any hydrolysis of urea ammonia reaction unit according to claim 1, which is characterized in that on the reactor 1
It is provided with gas-liquid separation device (29), the gas-liquid separation device (29) includes sequentially connected guide shell (30), venturi type
Demister (31) and mesh mist eliminator (32), the guide shell (30) are connected to the inside of the reactor (1).
10. -9 any hydrolysis of urea ammonia reaction unit according to claim 1, which is characterized in that adjacent projections (3)
The distance between vertex be 3-10cm, the distance between bottom point of adjacent depression (4) is 3-15cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910641660.0A CN110422860A (en) | 2019-07-16 | 2019-07-16 | A kind of hydrolysis of urea ammonia reaction unit |
Applications Claiming Priority (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110775986A (en) * | 2019-11-20 | 2020-02-11 | 北京新叶能源科技有限公司 | Urea catalytic hydrolysis ammonia production equipment and preparation method thereof |
| CN115417429A (en) * | 2022-07-18 | 2022-12-02 | 华能国际电力股份有限公司大连电厂 | A urea pyrolysis system ammonia economizer for denitration of boiler flue gas |
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| CN110775986A (en) * | 2019-11-20 | 2020-02-11 | 北京新叶能源科技有限公司 | Urea catalytic hydrolysis ammonia production equipment and preparation method thereof |
| CN115417429A (en) * | 2022-07-18 | 2022-12-02 | 华能国际电力股份有限公司大连电厂 | A urea pyrolysis system ammonia economizer for denitration of boiler flue gas |
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