CN110436481A - A kind of hydrolysis of urea reactor gas-liquid recovery system and its recovery method - Google Patents
A kind of hydrolysis of urea reactor gas-liquid recovery system and its recovery method Download PDFInfo
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- CN110436481A CN110436481A CN201910833284.5A CN201910833284A CN110436481A CN 110436481 A CN110436481 A CN 110436481A CN 201910833284 A CN201910833284 A CN 201910833284A CN 110436481 A CN110436481 A CN 110436481A
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 128
- 239000004202 carbamide Substances 0.000 title claims abstract description 128
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 117
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 117
- 239000007788 liquid Substances 0.000 title claims abstract description 113
- 238000011084 recovery Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims description 13
- 238000010521 absorption reaction Methods 0.000 claims abstract description 64
- 239000012071 phase Substances 0.000 claims abstract description 32
- 239000007791 liquid phase Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000004064 recycling Methods 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 115
- 239000007789 gas Substances 0.000 claims description 76
- 229910021529 ammonia Inorganic materials 0.000 claims description 57
- 239000011259 mixed solution Substances 0.000 claims description 57
- 239000000243 solution Substances 0.000 claims description 36
- 238000005192 partition Methods 0.000 claims description 34
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000007864 aqueous solution Substances 0.000 claims description 22
- 238000010992 reflux Methods 0.000 claims description 18
- 238000010257 thawing Methods 0.000 claims description 17
- 239000001569 carbon dioxide Substances 0.000 claims description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 14
- 238000010612 desalination reaction Methods 0.000 claims description 12
- 238000007747 plating Methods 0.000 claims description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical group [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 9
- 239000000908 ammonium hydroxide Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000009825 accumulation Methods 0.000 claims description 5
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 238000011109 contamination Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 claims description 3
- 210000002700 urine Anatomy 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 2
- 206010058109 Hangnail Diseases 0.000 claims 1
- 239000008246 gaseous mixture Substances 0.000 claims 1
- 238000001727 in vivo Methods 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 239000010865 sewage Substances 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- LRDAUUGUXQIHED-UHFFFAOYSA-N N.[N]=O Chemical class N.[N]=O LRDAUUGUXQIHED-UHFFFAOYSA-N 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006471 dimerization reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000000622 irritating effect Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The present invention relates to a kind of hydrolysis of urea reactor gas-liquid recovery systems, including hydrolysis of urea reactor and Gas-Liquid Absorption tank, and gas phase emission pipeline, liquid phase discharge pipe, solution backflow pipe road are connected between hydrolysis of urea reactor and Gas-Liquid Absorption tank.The structure of the hydrolysis of urea reactor gas-liquid recovery system is simple; Gas-Liquid Absorption tank is introduced by the exhaust drain for carrying out hydrolysis of urea reactor because of overpressure protection; it avoids exhaust drain and enters one's respective area wastewater disposal basin or secondary pollution is caused in plant area's chemistry pond; Gas-Liquid Absorption in-tank mixing solution can be back to the recycling of hydrolysis of urea reactor through solution backflow pipe road simultaneously; hydrolysis of urea system is substantially increased to the utilization rate of urea raw material, reduces system energy consumption.
Description
Technical field
The present invention relates to a kind of hydrolysis of urea reactor gas-liquid recovery system and its recovery methods, belong to flue gas denitrification system
Middle urea hydrolysis ammonia producing system technical field.
Background technique
For nitrogen oxides (NO in coal-fired power plant's boiler tail flue gas discharge processx) polluted caused by atmosphere, state
Relevant departments, family have put into effect stringent discharged nitrous oxides index limits.Utilize ammonia (NH3) as reducing agent reduction pot
Fire grate puts the gas denitrifying technology of nitrogen oxides in effluent concentration, has popularized application in an all-round way at present.
In the flue gas denitrification system of early stage, liquefied ammonia or ammonium hydroxide is mostly used to prepare the process program of reducing agent (ammonia), but
It is that relevant item has extremely stringent examination & approval and supervision flow, and the storage equipment of liquefied ammonia, ammonium hydroxide belongs to major hazard source, peace
Full operating cost is high.The liquefied ammonia storage system accident to take place frequently in the recent period, also promotes the relevant technologies industry to be updated, upgrade.Closely
Nian Lai, had developed into using the process program that the lower urea granules of danger coefficient prepare ammonia it is ripe, and among these, urea water
Solution ammonia process is simple with its system, arrangement is convenient, controls the features such as flexible, is increasingly becoming most of coal-burning boiler denitrification reducing agents
The preferred option of secondary system transformation.
Hydrolysis of urea reacts in ammonia system processed, and most important equipment is hydrolysis of urea reactor, which belongs to Horizontal type pressure
Force container.When system is run, urea liquid absorbs heat in inside reactor, and hydrolysis of urea chemical reaction occurs, passes through gas-liquid
Separation produces hydrolysis prods gas, the i.e. mixed gas of ammonia, carbon dioxide, vapor.When Denitration in Boiler system needs ammonia amount sharply
Assemble dimerization product gas when decline, inside hydrolysis reactor, causes hydrolysis reactor superpressure.There is hydrolysis reactor superpressure phenomenon
When, in order to protect to pressure vessel, relevant protective device can externally discharge the gas gathered in reactor in time.If
Exhaust can not be such that reactor pressure effectively declines, and the urea that related protection mechanism also further can externally discharge in hydrolyzer is molten
Liquid reaches decompression purpose so that can not continue to generate in reactor, gather gas.In addition, when hydrolysis reactor is stopped transport and heat
When intake line failure, system can not thoroughly completely cut off heat input, it is also possible to cause the superpressure of hydrolysis reactor, at this time superpressure
Protection mechanism equally will do it exhaust or drain.
In previous hydrolysis of urea system design, the exhaust drain after reactor superpressure would generally be with reactor blowdown
Waste liquid summarizes, and uniform effluent is to plant area's wastewater disposal basin.But it since reactor superpressure exhaust lifting rate is larger and related frequency, and urinates
Plain region to waste water to collect ability limited, exhaust and drain natural cooling can not be made, the high-temp liquid containing ammonia often occur and exist
, there is irritative gas in the loss of one's respective area or chemical wastewater pool area, causes secondary pollution.
Summary of the invention
In view of the deficiencies in the prior art, technical problem to be solved by the invention is to provide a kind of hydrolysis of urea reactor gas
Liquid recovery system and its recovery method.
In order to solve the above-mentioned technical problem, the technical scheme is that a kind of hydrolysis of urea reactor gas-liquid recycling system
System, including hydrolysis of urea reactor and Gas-Liquid Absorption tank, are connected with gas between hydrolysis of urea reactor and Gas-Liquid Absorption tank
Phase discharge pipe, liquid phase discharge pipe, solution backflow pipe road.
Preferably, gas phase emission pipeline includes the gas phase pipe for being connected to hydrolysis of urea reactor head and Gas-Liquid Absorption pot bottom
Road is provided with gas phase emission valve on gas phase pipeline, and one end of gas phase pipeline is protruded into bottom in Gas-Liquid Absorption tank and is provided with and communicated with
Several gases press slow release tube.
Preferably, liquid phase discharge pipe includes the liquid-phase tube for being connected to hydrolysis of urea reactor bottom and Gas-Liquid Absorption pot bottom
Road is provided with liquid phase drain valve on liquid pipe.
Preferably, solution backflow pipe road includes that connection Gas-Liquid Absorption pot bottom and the urea of hydrolysis of urea reactor bottom are molten
The reflux line of liquid inlet tube, reflux line along reflux direction be disposed with recovery pump, mixed solution recovery valve, mixing it is molten
Liquid non-return valve；It is connected between reflux line and urea liquid inlet tube through fluid pipeline mixer.
Preferably, liquid phase discharge pipe is connected with hydrolysis of urea reactor blow-off line, urea before liquid phase drain valve
Hydrolyzer blowdown valve is provided on hydrolysis reactor blow-off line.
Preferably, Gas-Liquid Absorption tank inner top is provided with spray piping, and spray piping includes desalination waterpipe, desalination water pipe
The one end in road protrudes into Gas-Liquid Absorption tank inner top and is connected with several spray heads sprayed downward, sets on desalination waterpipe
It is equipped with spray desalination water valve；Gas-Liquid Absorption tank top is connected with to vacant duct, is examined to ammonia concentration is provided on vacant duct
Survey instrument.
Preferably, it is connected on the solution backflow pipe road between recovery pump and mixed solution recovery valve towards gas-liquid
The internal recycle pipeline of bottom in tourie, internal recycle pipeline are disposed with mixed solution time along Gas-Liquid Absorption tank trend is flowed to
Flow valve, mixed solution density tester；It is connected on solution backflow pipe road between internal recycle pipeline and mixed solution recovery valve
It is provided with solution blow-off line, mixed solution blowdown valve is provided on solution blow-off line.
Preferably, demister, demister packet are connected in the hydrolysis prods gas outlet of hydrolysis of urea reactor head
The hollow cylinder that setting is connected in the outlet of hydrolysis prods gas is included, inner barrel is disposed with not complete from bottom to top along gas phase flow direction
The full choked flow guide vane for blocking cylinder, silk screen demisting section；The inner barrel of choked flow guide vane lower part is additionally provided with vortex-flow and defrosting section；Eddy flow
If demisting section includes spiral guide vane of the dry plate circumference uniform distribution in inner barrel, vortex-flow and defrosting section is close to hydrolysis of urea reactor outlet
Setting；Choked flow guide vane includes flowing to bellows segment, the separator segment set gradually from bottom to top along gas phase；Bellows segment includes multi-disc in class
The curved corrugated plating of S-shaped, along inner barrel chord length directional spreding, the side of class S-shaped is connected with cylinder inboard wall corrugated plating,
The reversed acanthoid filter drop piece that from-inner-to-outer is downwardly inclined is installed in the plate face of corrugated plating；Separator segment includes eaves formula partition and ring
Shape partition, eaves formula partition is fixedly arranged on middle part in cylinder and its plate face from-inner-to-outer is downwardly inclined, and annular partition is fixedly arranged on cylinder
Internal perisporium and its plate face is downwardly inclined from outer to inner, eaves formula partition be located under annular partition inner ring and with annular partition inner ring
Between have through-flow gap；Eaves formula partition is in the annular funnel-form of big mouth down；Silk screen demisting section includes integrally being in the form of a column
Silk screen, the upper surface of silk screen are installed with die mould rib, and silk screen outer diameter is identical as cylinder internal diameter；Die mould rib includes being connected in cylinder
The annular ring of inner wall is installed with reinforcement spoke in annular ring；Cylinder periphery wall is installed with central flange, upper flange.
A kind of recovery method of hydrolysis of urea reactor gas-liquid recovery system, sequentially includes the following steps: (1) urea liquid and enters
Mouth, which is managed, is passed through aqueous solution of urea in hydrolysis of urea reactor, and the original of hydrolysis of urea reaction occurs for hydrolysis of urea reactor supplement
Material, aqueous solution of urea issue raw hydrolysis in 150 DEG C, 0.6Mpa, generate the mixed gas of ammonia, carbon dioxide, vapor；
(2) ammonia, carbon dioxide, vapor mixed gas hydrolysis of urea reactor operation there is superpressure and to product gas demand
When little, Gas-Liquid Absorption tank is pressed by gas phase emission tubes rows drainage, the interior bottom of Gas-Liquid Absorption tank has original urea water
Solution or demineralized water, the ammonia in exhaust come into full contact with water, and completely soluble in water；(3) when hydrolysis of urea reactor is run
There is superpressure, and when gas phase emission is not enough to pressure release, aqueous solution of urea is discharged into Gas-Liquid Absorption tank by liquid phase discharge pipe
Interior bottom makes pyrosol and room temperature demineralized water come into full contact with cooling；(4) original aqueous solution of urea is removed in Gas-Liquid Absorption tank or is removed
Outside salt water, also there is the mixed gas of ammonia, carbon dioxide, vapor, vacant duct can effectively ensure that in exhaust and do not dissolve in
The carbon dioxide of water is discharged in time, and Gas-Liquid Absorption tank is made to maintain normal pressure state, reduces operational safety risk, while ammonia concentration is examined
It surveys instrument real-time monitoring and ammonia in gas gas concentration is discharged to vacant duct, when concentration reaches certain value, in order to reduce to outside contamination
And system is improved to the recycling efficiency of ammonia, piping is sprayed by demineralized water and introduces Gas-Liquid Absorption tank, to the ammonia of excessive loss
Gas carries out spray-absorption, while cooling down to solution in tank, reduces the loss of ammonia；It can also be sprayed when not working vacant duct
Leaching quickly absorbs ammonia；(5) medium is ammonium hydroxide and aqueous solution of urea in Gas-Liquid Absorption tank, which is benefit to be recycled
Solution, characteristic are that heating can produce ammonia, and it is physical reactions that wherein ammonium hydroxide heating, which generates ammonia, and aqueous solution of urea adds
It is hydrolysis that heat, which generates ammonia, which enters before hydrolysis of urea reactor is recycled through reflux line,
It needs to test to its density, sees whether it reaches using condition, wherein recovery pump, mixed solution return valve are opened, mixing
Solution blowdown valve, mixed solution recovery valve, mixed solution non-return valve are closed, and it is close that mixed solution density tester detects mixed solution
Degree, after mixed solution density is up to standard, mixed solution return valve, mixed solution blowdown valve are closed, recovery pump, mixed solution recycling
Valve, mixed solution non-return valve are opened, and mixed solution enters hydrolysis of urea after the mixing of new aqueous solution of urea through reflux line and reacts
Device is recycled.
Preferably, the hydrolysis prods gas of hydrolysis of urea reactor head from bottom to top successively through vortex-flow and defrosting section, bellows segment,
Separator segment, silk screen demisting section stop the drop in air-flow as far as possible, under the mixed gas after demisting enters through cylinder top opening
Play pipe road；Wherein (1) vortex-flow and defrosting section and bellows segment are separated except the big drop in air-flow, and spiral guide vane makes in vortex-flow and defrosting section
Inlet air flow rotation, is acted on by centrifugal force and big drop is thrown on spiral guide vane wall surface, and discharge downwards under the effect of gravity；
Air-flow is increased by gap between adjacent corrugated plate, motion profile in bellows segment, separates it with the collision of corrugated plating by air-flow
In liquid, while reversed acanthoid filter drop piece improves big drop and filters out ability, and big drop, which can also be collided, filters drop on piece, In in reversed acanthoid
It is discharged downwards under gravity；(2) droplet in silk screen demisting section separation bubble, eaves formula partition and annular partition are further
Increase the running track of air-flow, reinforce the flow perturbation for entering silk screen demisting section, and then improve comprehensive defogging effect, eaves formula every
The drop that plate is also beneficial to collision accumulation with annular partition is discharged downwards in gravity.
Compared with prior art, the invention has the following advantages: the hydrolysis of urea reactor gas-liquid recovery system
Structure is simple, introduces Gas-Liquid Absorption tank by the exhaust drain for carrying out hydrolysis of urea reactor because of overpressure protection, avoids
Exhaust drain enters one's respective area wastewater disposal basin or secondary pollution, while Gas-Liquid Absorption in-tank mixing solution energy are caused in plant area's chemistry pond
It is back to the recycling of hydrolysis of urea reactor through solution backflow pipe road, substantially increases hydrolysis of urea system to urea raw material
Utilization rate reduces system energy consumption, provides new technical solution for the energy-saving and environmental protection of urea hydrolysis ammonia producing system.
The present invention will be further described in detail with reference to the accompanying drawings and detailed description.
Detailed description of the invention
Fig. 1 is the organigram of the embodiment of the present invention.
Fig. 2 is existing demister schematic diagram.
Fig. 3 is the organigram one of demister.
Fig. 4 is the organigram two of demister.
Fig. 5 is silk screen demisting section top view.
Fig. 6 is bellows segment top view.
Fig. 7 is vortex-flow and defrosting section top view.
Specific embodiment
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and cooperate attached drawing, make detailed
Carefully it is described as follows.
As shown in Fig. 1 ~ 7, a kind of hydrolysis of urea reactor gas-liquid recovery system, including hydrolysis of urea reactor 1 and gas-liquid
Tourie 18 is connected with gas phase emission pipeline, liquid phase discharge pipe, molten between hydrolysis of urea reactor and Gas-Liquid Absorption tank
Liquid return line.
In embodiments of the present invention, gas phase emission pipeline includes connection hydrolysis of urea reactor head and Gas-Liquid Absorption tank bottom
The gas phase pipeline 19 in portion is provided with gas phase emission valve 20 on gas phase pipeline, and bottom in Gas-Liquid Absorption tank is protruded into one end of gas phase pipeline
Portion is simultaneously provided with and communicated with several gases and presses slow release tube 21, it is made to be sufficiently mixed cooling with demineralized water.
In embodiments of the present invention, liquid phase discharge pipe includes connection hydrolysis of urea reactor bottom and Gas-Liquid Absorption tank bottom
The liquid pipe 22 in portion is provided with liquid phase drain valve 23 on liquid pipe.
In embodiments of the present invention, solution backflow pipe road includes connection Gas-Liquid Absorption pot bottom and hydrolysis of urea reactor bottom
The reflux line 24 of the urea liquid inlet tube in portion, reflux line along reflux direction be disposed with recovery pump 25, mixing it is molten
Liquid recovery valve 26, mixed solution non-return valve 27；Through 28 phase of fluid pipeline mixer between reflux line and urea liquid inlet tube
Connection.
In embodiments of the present invention, liquid phase discharge pipe is connected with hydrolysis of urea reactor blowdown before liquid phase drain valve
Pipeline 29 is provided with hydrolyzer blowdown valve 30, hydrolysis of urea reactor long-play on hydrolysis of urea reactor blow-off line
Afterwards, the impurity brought by aqueous solution of urea can be accumulated in hydrolysis of urea reactor bottom, by the pipeline, can be arranged accumulation of foreign matter
Out, improve hydrolysis of urea reactor operational efficiency, improve the adaptability of system, guarantee maintenance to hydrolysis of urea reactor,
The feasibility of maintenance.
In embodiments of the present invention, Gas-Liquid Absorption tank inner top is provided with spray piping, and spray piping includes desalination water pipe
Road 31, one end of desalination waterpipe protrude into Gas-Liquid Absorption tank inner top and are connected with several spray heads sprayed downward
32, spray desalination water valve 33 is provided on desalination waterpipe；Gas-Liquid Absorption tank top is connected with to vacant duct 34, to blank pipe
Ammonia concentration detector 35 is provided on road.
In embodiments of the present invention, setting is connected on the solution backflow pipe road between recovery pump and mixed solution recovery valve
There is the internal recycle pipeline 36 for leading to bottom in Gas-Liquid Absorption tank, internal recycle pipeline is set gradually along Gas-Liquid Absorption tank trend is flowed to
There are mixed solution return valve 37, mixed solution density tester 38；It is molten between internal recycle pipeline and mixed solution recovery valve
It is connected with solution blow-off line 39 on liquid return line, mixed solution blowdown valve 40, gas are provided on solution blow-off line
Liquid tourie medium is impure ammonium hydroxide and urea mixed solution, after Gas-Liquid Absorption tank long-play, by exhaust, drain, is removed
The impurity that salt water is brought into can be accumulated in Gas-Liquid Absorption pot bottom, accumulation of foreign matter can be expelled to one's respective area by solution blow-off line
Wastewater disposal basin or plant area's chemical wastewater pond are handled, and the safety and applicability of this system are enhanced, and improve running efficiency of system, are protected
Demonstrate,prove the feasibility of maintenance, the maintenance to Gas-Liquid Absorption tank.
In embodiments of the present invention, it is connected with and removes in the hydrolysis prods gas outlet 41 at 1 top of hydrolysis of urea reactor
Day with fog, demister include the hollow cylinder 2 that setting is connected in the outlet of hydrolysis prods gas, and inner barrel flows to from bottom to top along gas phase
It is disposed with choked flow guide vane 3, the silk screen demisting section 4 for not blocking cylinder completely, cylinder bottom end and top are opening, and bottom end is used
In air inlet, top is for being vented；The inner barrel of choked flow guide vane lower part is additionally provided with vortex-flow and defrosting section 5；Vortex-flow and defrosting section includes
If dry plate circumference uniform distribution is arranged in the spiral guide vane 6 of inner barrel, vortex-flow and defrosting section close to hydrolysis of urea reactor outlet；Choked flow
Guide vane includes flowing to bellows segment, the separator segment set gradually from bottom to top along gas phase；Bellows segment includes that multi-disc is curved in class S-shaped
Corrugated plating 7, corrugated plating is along inner barrel chord length directional spreding, and the side of class S-shaped is connected with cylinder inboard wall, corrugated plating
The reversed acanthoid filter drop piece 8 that from-inner-to-outer is downwardly inclined is installed in plate face；Separator segment includes eaves formula partition 9 and annular partition
10, eaves formula partition is fixedly arranged on middle part in cylinder and its plate face from-inner-to-outer is downwardly inclined, and annular partition is fixedly arranged on cylinder inner circumferential
Wall and its plate face is downwardly inclined from outer to inner, eaves formula partition is located under annular partition inner ring and between annular partition inner ring
With through-flow gap 11；Eaves formula partition is in the annular funnel-form of big mouth down；Silk screen demisting section includes the silk being integrally in the form of a column
Net 12, the upper surface of silk screen are installed with die mould rib 13, and silk screen outer diameter is identical as cylinder internal diameter；Die mould rib includes being connected in cylinder
The annular ring 14 of internal wall is installed in annular ring and reinforces spoke 15, solves silk screen since the part of the excessive generation of pressure difference becomes
Shape problem reinforces silk screen rigidity；Cylinder periphery wall is installed with central flange 16, upper flange 17, central flange and hydrolysis of urea
Reactor outlet is connected and fixed, and upper flange is connected and fixed with downstream line input end, improves the efficiency of maintenance and replacement.
A kind of recovery method of hydrolysis of urea reactor gas-liquid recovery system, sequentially includes the following steps: (1) urea liquid and enters
Mouth, which is managed, is passed through aqueous solution of urea in hydrolysis of urea reactor, and the original of hydrolysis of urea reaction occurs for hydrolysis of urea reactor supplement
Material, aqueous solution of urea issue raw hydrolysis in 150 DEG C, 0.6Mpa, generate the mixed gas of ammonia, carbon dioxide, vapor；
(2) ammonia, carbon dioxide, vapor mixed gas hydrolysis of urea reactor operation there is superpressure and to product gas demand
When little, Gas-Liquid Absorption tank is pressed by gas phase emission tubes rows drainage, the interior bottom of Gas-Liquid Absorption tank has original urea water
Solution or demineralized water, the ammonia in exhaust come into full contact with water, and completely soluble in water；(3) when hydrolysis of urea reactor is run
There is superpressure, and when gas phase emission is not enough to pressure release, aqueous solution of urea is discharged into Gas-Liquid Absorption tank by liquid phase discharge pipe
Interior bottom makes pyrosol and room temperature demineralized water come into full contact with cooling, when hydrolysis of urea reactor needs to clear up internal solution
When, solution can also be discharged by the pipeline；(4) in Gas-Liquid Absorption tank in addition to original aqueous solution of urea or demineralized water, also there is ammonia
The mixed gas of gas, carbon dioxide, vapor can effectively ensure that carbon dioxide not soluble in water in exhaust is timely to vacant duct
Discharge makes Gas-Liquid Absorption tank maintain normal pressure state, reduces operational safety risk, while ammonia concentration detector real-time monitoring is to sky
Ammonia in gas gas concentration is discharged in pipeline, when concentration reaches certain value, in order to reduce to outside contamination and improve system to ammonia
Recycling efficiency, demineralized water introduces Gas-Liquid Absorption tank, carries out spray-absorption to the ammonia of excessive loss, together by spray piping
When cool down to solution in tank, reduce the loss of ammonia；It can also be sprayed when not working vacant duct and quickly absorb ammonia,
Loss of material is reduced, improves system to the recovery utilization rate of ammonia；(5) medium is ammonium hydroxide and urea water in Gas-Liquid Absorption tank
Solution, the mixed solution are the solution to be recycled utilized, and characteristic is that heating can produce ammonia, and wherein ammonium hydroxide heating generates
Ammonia is physical reactions, and it is hydrolysis that aqueous solution of urea heating, which generates ammonia, which enters urine through reflux line
It before plain hydrolysis reactor is recycled, needs to test to its density, sees whether it reaches using condition, if by gas
The mixed solution of low concentration squeezes into hydrolysis of urea reactor in liquid tourie, then may cause operation in hydrolysis of urea reactor
It is unstable, therefore internal recycle pipeline can guarantee the stable operation of a whole set of recovery system；Wherein recovery pump, mixed solution return valve
It opens, mixed solution blowdown valve, mixed solution recovery valve, mixed solution non-return valve are closed, the detection of mixed solution density tester
Mixed solution density, after mixed solution density is up to standard, mixed solution return valve, mixed solution blowdown valve are closed, and recovery pump is mixed
Solution recovery valve, the unlatching of mixed solution non-return valve are closed, mixed solution enters urine after reflux line is mixed with new aqueous solution of urea
Plain hydrolysis reactor is recycled.
In embodiments of the present invention, the hydrolysis prods gas of hydrolysis of urea reactor head is from bottom to top successively through vortex-flow and defrosting
Section, bellows segment, separator segment, silk screen demisting section stop the drop in air-flow as far as possible, and the mixed gas after demisting is through cylinder top
Opening enters downstream line；Wherein (1) vortex-flow and defrosting section and bellows segment are separated except the big drop in air-flow, in vortex-flow and defrosting section
Spiral guide vane rotates inlet air flow, is acted on by centrifugal force and big drop is thrown on spiral guide vane wall surface, and in gravity
Lower discharge downwards；Air-flow is increased by gap between adjacent corrugated plate, motion profile in bellows segment, passes through air-flow and corrugated plating
Collision separates liquid therein, while reversed acanthoid filter drop piece improves big drop and filters out ability, and big drop can also be collided in reversed acanthoid
Filter drop on piece, under the effect of gravity discharge downwards；(2) droplet in silk screen demisting section separation bubble, eaves formula partition and ring
Shape partition further increases the running track of air-flow, reinforces the flow perturbation for entering silk screen demisting section, and then improves comprehensive demisting
Effect, the drop that eaves formula partition is also beneficial to collision accumulation with annular partition are discharged downwards in gravity.
In embodiments of the present invention, hydrolysis prods gas is the mixed gas of ammonia, carbon dioxide, vapor, is conveyed
Into Benitration reactor, ammonia nitrogen oxides reduction reaches denitrating flue gas purpose.Carbon dioxide, vapor are discharged with flue gas without it
His purposes.
The present invention is not limited to above-mentioned preferred forms, anyone can show that other are each under the inspiration of the present invention
The hydrolysis of urea reactor gas-liquid recovery system and its recovery method of kind form.It is all done according to scope of the present invention patent it is equal
Deng variation and modification, it is all covered by the present invention.
Claims (10)
1. a kind of hydrolysis of urea reactor gas-liquid recovery system, it is characterised in that: including hydrolysis of urea reactor and Gas-Liquid Absorption
Tank is connected with gas phase emission pipeline, liquid phase discharge pipe, solution reflux between hydrolysis of urea reactor and Gas-Liquid Absorption tank
Pipeline.
2. hydrolysis of urea reactor gas-liquid recovery system according to claim 1, it is characterised in that: gas phase emission pipeline packet
The gas phase pipeline of connection hydrolysis of urea reactor head and Gas-Liquid Absorption pot bottom is included, is provided with gas phase emission on gas phase pipeline
Valve, one end of gas phase pipeline, which protrudes into Gas-Liquid Absorption tank bottom and is provided with and communicated with several gases, presses slow release tube.
3. hydrolysis of urea reactor gas-liquid recovery system according to claim 1, it is characterised in that: liquid phase discharge pipe packet
The liquid pipe of connection hydrolysis of urea reactor bottom and Gas-Liquid Absorption pot bottom is included, liquid phase discharge is provided on liquid pipe
Valve.
4. hydrolysis of urea reactor gas-liquid recovery system according to claim 1, it is characterised in that: solution backflow pipe road packet
Include the reflux line of the urea liquid inlet tube of connection Gas-Liquid Absorption pot bottom and hydrolysis of urea reactor bottom, reflux line edge
Reflux direction be disposed with recovery pump, mixed solution recovery valve, mixed solution non-return valve；Reflux line enters with urea liquid
It is connected between mouth pipe through fluid pipeline mixer.
5. hydrolysis of urea reactor gas-liquid recovery system according to claim 3, it is characterised in that: liquid phase discharge pipe exists
It is connected with hydrolysis of urea reactor blow-off line before liquid phase drain valve, is provided with hydrolysis on hydrolysis of urea reactor blow-off line
Device blowdown valve.
6. hydrolysis of urea reactor gas-liquid recovery system according to claim 1, it is characterised in that: top in Gas-Liquid Absorption tank
Portion is provided with spray piping, and spray piping includes desalination waterpipe, and Gas-Liquid Absorption tank inner top is protruded into one end of desalination waterpipe
And several spray heads sprayed downward are connected with, spray desalination water valve is provided on desalination waterpipe；Gas-Liquid Absorption tank
Top is connected with to vacant duct, to being provided with ammonia concentration detector on vacant duct.
7. hydrolysis of urea reactor gas-liquid recovery system according to claim 4, it is characterised in that: recovery pump with mix
Solution backflow pipe road between solution recovery valve is connected with the internal recycle pipeline towards bottom in Gas-Liquid Absorption tank, inside follows
Endless tube road is disposed with mixed solution return valve, mixed solution density tester along Gas-Liquid Absorption tank trend is flowed to；Inside
Solution backflow pipe road between circulating line and mixed solution recovery valve is connected with solution blow-off line, solution sewage pipe
Mixed solution blowdown valve is provided on road.
8. hydrolysis of urea reactor gas-liquid recovery system according to claim 1, it is characterised in that: hydrolysis of urea reactor
Demister is connected in the hydrolysis prods gas outlet at top, demister includes during connection is arranged in the outlet of hydrolysis prods gas
Empty cylinder, inner barrel are disposed with choked flow guide vane, the silk screen demisting for not blocking cylinder completely along gas phase flow direction from bottom to top
Section；The inner barrel of choked flow guide vane lower part is additionally provided with vortex-flow and defrosting section；If vortex-flow and defrosting section includes dry plate circumference uniform distribution in cylinder
The spiral guide vane in internal portion, vortex-flow and defrosting section are arranged close to hydrolysis of urea reactor outlet；Choked flow guide vane includes flowing to along gas phase
Bellows segment, the separator segment set gradually from bottom to top；Bellows segment includes multi-disc in the curved corrugated plating of class S-shaped, the equal edge of corrugated plating
Inner barrel chord length directional spreding, the side of class S-shaped are connected with cylinder inboard wall, are installed in the plate face of corrugated plating
And the reversed acanthoid filter drop piece being downwardly inclined outside；Separator segment includes eaves formula partition and annular partition, and eaves formula partition is fixedly arranged on cylinder
Middle part and its plate face from-inner-to-outer is downwardly inclined in vivo, annular partition be fixedly arranged on cylinder internal perisporium and its plate face from outer to inner downward
Inclination, eaves formula partition are located under annular partition inner ring and have through-flow gap between annular partition inner ring；Eaves formula every
Plate is in the annular funnel-form of big mouth down；Silk screen demisting section includes the silk screen being integrally in the form of a column, and the upper surface of silk screen is installed with pressure
Type rib, silk screen outer diameter are identical as cylinder internal diameter；Die mould rib includes the annular ring for being connected in cylinder inboard wall, fixed in annular ring
There is reinforcement spoke；Cylinder periphery wall is installed with central flange, upper flange.
9. a kind of recovery method of hydrolysis of urea reactor gas-liquid recovery system a method as claimed in any one of claims 1-8, feature
It is, sequentially includes the following steps: (1) urea liquid inlet tube and be passed through aqueous solution of urea in hydrolysis of urea reactor, is urea
The raw material of hydrolysis of urea reaction occurs for hydrolysis reactor supplement, and aqueous solution of urea issues raw hydrolysis in 150 DEG C, 0.6Mpa,
Generate the mixed gas of ammonia, carbon dioxide, vapor；(2) mixed gas of ammonia, carbon dioxide, vapor is in urea water
Solution reactor operation occur superpressure and it is little to product gas demand when, Gas-Liquid Absorption is pressed by gas phase emission tubes rows drainage
Tank, the interior bottom of Gas-Liquid Absorption tank have original aqueous solution of urea or demineralized water, and the ammonia in exhaust comes into full contact with water, and complete
It is complete soluble in water；(3) when superpressure occurs in the operation of hydrolysis of urea reactor, and gas phase emission is not enough to pressure release, aqueous solution of urea
It is discharged into the interior bottom of Gas-Liquid Absorption tank by liquid phase discharge pipe, pyrosol and room temperature demineralized water is made to come into full contact with cooling；
(4) in Gas-Liquid Absorption tank in addition to original aqueous solution of urea or demineralized water, also there is the gaseous mixture of ammonia, carbon dioxide, vapor
Body can effectively ensure that carbon dioxide not soluble in water in exhaust is discharged in time to vacant duct, Gas-Liquid Absorption tank made to maintain normal pressure
State reduces operational safety risk, while ammonia in gas gas concentration is discharged to vacant duct in ammonia concentration detector real-time monitoring, when
When concentration reaches certain value, in order to reduce to outside contamination and the recycling efficiency that improves system to ammonia, spray piping will
Demineralized water introduces Gas-Liquid Absorption tank, carries out spray-absorption to the ammonia of excessive loss, while cooling down to solution in tank, reduces
The loss of ammonia；It can also be sprayed when not working vacant duct and quickly absorb ammonia；(5) medium is ammonium hydroxide in Gas-Liquid Absorption tank
And aqueous solution of urea, the mixed solution are the solution to be recycled utilized, characteristic is that heating can produce ammonia, wherein ammonium hydroxide
It is physical reactions that heating, which generates ammonia, and it is hydrolysis that aqueous solution of urea heating, which generates ammonia, and the mixed solution is through return pipe
Road enters before hydrolysis of urea reactor is recycled, and needs to test to its density, sees whether it reaches using condition,
Wherein recovery pump, mixed solution return valve are opened, and mixed solution blowdown valve, mixed solution recovery valve, mixed solution non-return valve close
It closes, mixed solution density tester detects mixed solution density, and after mixed solution density is up to standard, mixed solution return valve is mixed
It closes solution blowdown valve to close, recovery pump, mixed solution recovery valve, mixed solution non-return valve are opened, and mixed solution is through reflux line
Enter hydrolysis of urea reactor after mixing with new aqueous solution of urea to be recycled.
10. the recovery method of hydrolysis of urea reactor gas-liquid recovery system according to claim 9, it is characterised in that: urine
Hydrolysis prods gas at the top of plain hydrolysis reactor is from bottom to top successively through vortex-flow and defrosting section, bellows segment, separator segment, silk screen demisting section
Stop the drop in air-flow as far as possible, the mixed gas after demisting enters downstream line through cylinder top opening；Wherein (1) eddy flow
Demisting section and bellows segment are separated except the big drop in air-flow, and spiral guide vane rotates inlet air flow in vortex-flow and defrosting section, are passed through
Big drop is thrown on spiral guide vane wall surface by centrifugal force effect, and discharge downwards under the effect of gravity；Air-flow passes through in bellows segment
Gap between adjacent corrugated plate, motion profile increase, and liquid therein, while hangnail are separated with the collision of corrugated plating by air-flow
Shape filter drips the big drop of piece raising and filters out ability, and big drop, which can also be collided, filters drop on piece in reversed acanthoid, arranges downwards under the effect of gravity
Out；(2) droplet in silk screen demisting section separation bubble, eaves formula partition and annular partition further increase the operation rail of air-flow
Mark reinforces the flow perturbation for entering silk screen demisting section, and then improves comprehensive defogging effect, and eaves formula partition also has with annular partition
Drop conducive to collision accumulation is discharged downwards in gravity.
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Effective date of registration: 20230614 Address after: 250300 Unit 2, Building 1, Industrial and Commercial Bureau Dormitory, Wensheng Street, Changqing District, Jinan, Shandong Province Applicant after: Meng Xianheng Address before: 1004, Building 1, Qinting Lake, No. 123, Nanping East Road, Fuzhou City, Fujian Province, 350012 Applicant before: Huang Sijia |
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Application publication date: 20191112 |