CN107188198A - A kind of thermal power plant's denitration is pyrolyzed with hydrolysis of urea and is combined ammonia system processed - Google Patents
A kind of thermal power plant's denitration is pyrolyzed with hydrolysis of urea and is combined ammonia system processed Download PDFInfo
- Publication number
- CN107188198A CN107188198A CN201710509546.3A CN201710509546A CN107188198A CN 107188198 A CN107188198 A CN 107188198A CN 201710509546 A CN201710509546 A CN 201710509546A CN 107188198 A CN107188198 A CN 107188198A
- Authority
- CN
- China
- Prior art keywords
- hydrolysis
- urea
- power plant
- hydrolysis reactor
- pyrolyzed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007062 hydrolysis Effects 0.000 title claims abstract description 66
- 238000006460 hydrolysis reaction Methods 0.000 title claims abstract description 66
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 59
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000004202 carbamide Substances 0.000 title claims abstract description 47
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000010612 desalination reaction Methods 0.000 claims abstract description 16
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 12
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 239000000047 product Substances 0.000 description 12
- 239000007789 gas Substances 0.000 description 10
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 9
- 238000000197 pyrolysis Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 239000007795 chemical reaction product Substances 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical compound [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 description 1
- 230000001754 anti-pyretic effect Effects 0.000 description 1
- 239000002221 antipyretic Substances 0.000 description 1
- PPBAJDRXASKAGH-UHFFFAOYSA-N azane;urea Chemical compound N.NC(N)=O PPBAJDRXASKAGH-UHFFFAOYSA-N 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- YOWAEZWWQFSEJD-UHFFFAOYSA-N quinoxalin-2-amine Chemical compound C1=CC=CC2=NC(N)=CN=C21 YOWAEZWWQFSEJD-UHFFFAOYSA-N 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 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
Abstract
The invention discloses a kind of thermal power plant's denitration with hydrolysis of urea be pyrolyzed be combined ammonia system processed, including urea liquid inlet tube, hydrolysis reactor, except canister, desalination water pipe and exhaust fan；Urea liquid inlet tube is connected with the entrance of hydrolysis reactor side, the bottom of hydrolysis reactor is provided with the steam heater for being heated to the urea liquid in hydrolysis reactor, the top exit of hydrolysis reactor is connected with the bottom inlet except canister, except the desalination water inlet of canister side is connected with desalination water pipe, exhaust fan is located at the open top position except canister, except being communicated with ammonia water pipe at the outlet at bottom of canister, the system energy consumption is small, product will not block pipeline, and cost is low.
Description
Technical field
The present invention relates to one kind ammonia system processed, and in particular to a kind of thermal power plant's denitration is pyrolyzed with hydrolysis of urea and is combined ammonia system processed
System.
Background technology
Containing a large amount of nitrogen oxides, it is necessary to carry out purified treatment in the flue gas of coal-burning power plant's discharge.It is widely used at present
Gas denitrifying technology is all with ammonia (NH3) it is reducing agent, NOx is reduced to nontoxic nitrogen (N2).Examined for security
The preparation of ammonia is with urea (CO (NH in amount, thermal power plant2)2) it is raw material, it is divided into two technology paths of low temperature hydrolysis and high temperature pyrolysis.
Urea liquid occurs below hydrolysis at 200 DEG C, and reaction equation is：
NH2CONH2+(1+X)H2O→2NH3↑+CO2↑+(X)H2O↑
In practical engineering application, product gas comprises only the ammonia that mass fraction is 28.3%, and remainder is 36.7% titanium dioxide
Carbon and 35% vapor.Due to NH3With CO2The stronger condensate of corrosivity is easily formed at 140 DEG C, when less than 70 DEG C
Solid-state aminoquinoxaline is formed, therefore product gas outlet pipeline need to carry out whole heat tracing, prevent corrosive pipeline and blocking.
Urea pyrolysis technique is directly injected urea solution into pyrolysis oven (450-600 DEG C), and urea decomposes rapidly life
Into ammonia.Urea pyrolysis reaction equation is：
CO(NH2)2+H2O=2NH3↑+CO2↑
Two kinds of technics comparings, hydrolysis of urea has the advantages that to consume energy low (reaction temperature is low), but Product pipeline has burn into block up
The risk of plug, needs whole heat tracing, energy consumption is added again；Urea pyrolysis, which has, to be swift in response, and pipeline exempts from insulation, will not occur pipeline
The advantages of blocking, but pyrolysis oven cost is high, reaches that reaction temperature will consume additional fuel, is occurred for a long time using rear lower furnace
Impurity lumps, and influences stability in use.Therefore, a kind of installation cost of exploration is low, system consumes energy less, product will not block pipeline
Ammonia preparation system from urea is significant for thermal power plant's denitrating system efficient energy-saving operation.
The content of the invention
It is an object of the invention to the shortcoming for overcoming above-mentioned prior art, there is provided a kind of thermal power plant's denitration hydrolysis of urea
Pyrolysis is combined ammonia system processed, and the system energy consumption is small, and product will not block pipeline, and cost is low.
To reach above-mentioned purpose, thermal power plant's denitration of the present invention is pyrolyzed with hydrolysis of urea is combined ammonia system processed including urinating
Plain solution inlet port pipe, hydrolysis reactor, except canister, desalination water pipe and exhaust fan；
Urea liquid inlet tube is connected with the entrance of hydrolysis reactor side, and the bottom of hydrolysis reactor, which is provided with, to be used for
The steam heater heated to the urea liquid in hydrolysis reactor, the top exit of hydrolysis reactor and the bottom except canister
Portion's entrance is connected, except the desalination water inlet of canister side is connected with desalination water pipe, and exhaust fan is located to remove to be opened at the top of canister
Mouthful position, except being communicated with ammonia water pipe at the outlet at bottom of canister.
The side of the hydrolysis reactor is provided with gas phase relief tube.
Safety valve is provided with the top of the hydrolysis reactor.
The outlet at bottom of the hydrolysis reactor is connected through product fairlead with the bottom inlet except canister.
Except the outlet at bottom of canister is connected through delivery pump with ammonia water pipe.
The steam heater includes jet chimney, wherein, the middle part of jet chimney is located in hydrolysis reactor, steam pipe
The two ends in road are located at outside hydrolysis reactor.
The two ends of jet chimney are provided with the first valve.
The second valve is provided with desalination water pipe.
The 3rd valve is provided with urea liquid inlet tube.
The invention has the advantages that：
Thermal power plant's denitration of the present invention is pyrolyzed with hydrolysis of urea is combined ammonia system processed in concrete operations, urea liquid
Hydrolysis is first completed in hydrolysis reactor, and generates NH3、CO2And H2O, the product of hydrolysis is entered except the demineralized water in canister
In, due to CO2Solubility in demineralized water is relatively low, so that overwhelming majority CO2Escape, and arranged through exhaust fan from demineralized water
Enter the external world, NH3Saturation ammonia spirit is formed after being added in demineralized water, the saturation ammonia spirit enters fire through ammonia water pipe again
At power plant's denitration reaction device, so as to avoid NH3With CO2Transport together and easily form the stronger condensate of corrosivity, and block pipe
The problem of road, while avoiding whole heat tracing, energy consumption is smaller, and cost is low.It should be noted that the present invention is made with hydrolysate
For antipyretic raw material, the combination of hydrolysis of urea and pyrolytic process is successfully realized, decomposition reaction is reduced using temperate condition
Energy consumption, it is to avoid increase cost using pyrolysis oven and fuel, the product with generation is saturation ammoniacal liquor, is effectively prevented from blocking pipeline
The problem of.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Wherein, 1 it is urea liquid inlet tube, 2 be gas phase relief tube, 3 be hydrolysis reactor, 4 be safety valve, 5 is ammoniacal liquor
Pipe, 6 be steam heater, 7 be product fairlead, 8 be desalination water pipe, 9 be except canister, 10 are delivery pump, 11 are exhaust fan.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
With reference to Fig. 1, thermal power plant's denitration of the present invention is pyrolyzed compound ammonia system processed with hydrolysis of urea includes urea liquid
Inlet tube 1, hydrolysis reactor 3, except canister 9, desalination water pipe 8 and exhaust fan 11；Urea liquid inlet tube 1 and hydrolysis reactor 3
The entrance of side is connected, and the bottom of hydrolysis reactor 3 is provided with for being heated to the urea liquid in hydrolysis reactor 3
Steam heater 6, the top exit of hydrolysis reactor 3 with except the bottom inlet of canister 9 is connected, except removing for the side of canister 9
Brine inlet is connected with desalination water pipe 8, and exhaust fan 11 is located at the open top position except canister 9, except the outlet at bottom of canister 9
Place is communicated with ammonia water pipe 5.
The side of the hydrolysis reactor 3 is provided with gas phase relief tube 2；The top of hydrolysis reactor 3 is provided with safety valve
4；The outlet at bottom of hydrolysis reactor 3 is connected through product fairlead 7 with the bottom inlet except canister 9；Except the bottom of canister 9 goes out
Mouth is connected through delivery pump 10 with ammonia water pipe 5；Steam heater 6 includes jet chimney, wherein, the middle part of jet chimney is located at water
Solve in reactor 3, the two ends of jet chimney are located at outside hydrolysis reactor 3.
The two ends of jet chimney are provided with the first valve；The second valve is provided with desalination water pipe 8；Urea liquid import
The 3rd valve is provided with pipe 1.
The present invention specific operation process be：
Urea liquid is injected in hydrolysis reactor 3 through urea liquid inlet tube 1, when the liquid level of urea liquid reaches that hydrolysis is anti-
When answering the half of device 3, stop fluid injection, and start steam heater 6, urea liquid is heated by steam heater 6, promote
Enter urea reaction liquid 5 and occur hydrolysis, discharge NH3、CO2And H2The gaseous mix products such as O；When reaction rate is too fast, hydrolyze
It when pressure quickly increases in reactor 3, will not be exploded for protection hydrolysis reactor 3, then automatically turn on gas phase relief tube 2 and arranged
Gas, in addition, when pressure buildup is too fast, when the pressure release speed of gas phase relief tube 2 can not meet pressure release requirement, safety valve 4 is opened automatically
Open, so as to increase pressure release passage, it is ensured that the safe operation of hydrolysis reactor 3.
The reaction product of hydrolysis reactor 3 includes 40% CO as mass fraction2, 30% NH3And 30% water steams
Gas, and reaction product has certain pressure and temperature, and the reaction product of hydrolysis reactor 3 enters through product fairlead 7 to be removed
In demineralized water in canister 9, at normal temperatures and pressures, the demineralized water of 1 volume can only dissolve the CO of 1 volume2, and the desalination of 1 volume
Water can but dissolve the NH of 700 volumes3；Therefore after reaction product is passed through in demineralized water, NH3 is completely absorbed, and forms high concentration
Ammonia spirit, and CO2Solubility is limited, is dissolved into the CO in demineralized water2A small amount of (the NH of generation4)2CO3And NH4HCO3, but it is many
Remaining CO2Escaped in gaseous form from ammonia spirit, and air, the saturation ammoniacal liquor containing a small amount of ammonia salt are sent into through exhaust fan 11
Solution is sent at body of heater SCR through delivery pump 10 and ammonia water pipe 5, and under the conditions of high-temperature flue gas, is atomized, is decomposed and discharge rapidly
NH3, complete catalytic denitration reaction.
Claims (9)
1. a kind of thermal power plant's denitration is pyrolyzed with hydrolysis of urea and is combined ammonia system processed, it is characterised in that including urea liquid inlet tube
(1), hydrolysis reactor (3), except canister (9), desalination water pipe (8) and exhaust fan (11)；
Urea liquid inlet tube (1) is connected with the entrance of hydrolysis reactor (3) side, and the bottom of hydrolysis reactor (3) is set
There are the steam heater (6) for being heated to the urea liquid in hydrolysis reactor (3), the top of hydrolysis reactor (3)
Export and be connected with the bottom inlet except canister (9), except the desalination water inlet of canister (9) side is connected with desalination water pipe (8),
Exhaust fan (11) is located at the open top position except canister (9), except being communicated with ammonia water pipe (5) at the outlet at bottom of canister (9).
2. thermal power plant's denitration according to claim 1 is pyrolyzed with hydrolysis of urea and is combined ammonia system processed, it is characterised in that described
The side of hydrolysis reactor (3) is provided with gas phase relief tube (2).
3. thermal power plant's denitration according to claim 1 is pyrolyzed with hydrolysis of urea and is combined ammonia system processed, it is characterised in that described
Safety valve (4) is provided with the top of hydrolysis reactor (3).
4. thermal power plant's denitration according to claim 1 is pyrolyzed with hydrolysis of urea and is combined ammonia system processed, it is characterised in that described
The outlet at bottom of hydrolysis reactor (3) is connected through product fairlead (7) with the bottom inlet except canister (9).
5. thermal power plant's denitration according to claim 1 is pyrolyzed with hydrolysis of urea and is combined ammonia system processed, it is characterised in that except carbon
The outlet at bottom of tank (9) is connected through delivery pump (10) with ammonia water pipe (5).
6. thermal power plant's denitration according to claim 1 is pyrolyzed with hydrolysis of urea and is combined ammonia system processed, it is characterised in that described
Steam heater (6) includes jet chimney, wherein, the middle part of jet chimney is located in hydrolysis reactor (3), and the two of jet chimney
End is located at hydrolysis reactor (3) outside.
7. thermal power plant's denitration according to claim 6 is pyrolyzed with hydrolysis of urea and is combined ammonia system processed, it is characterised in that steam
The two ends of pipeline are provided with the first valve.
8. thermal power plant's denitration according to claim 7 is pyrolyzed with hydrolysis of urea and is combined ammonia system processed, it is characterised in that desalination
Water pipe is provided with the second valve on (8).
9. thermal power plant's denitration according to claim 8 is pyrolyzed with hydrolysis of urea and is combined ammonia system processed, it is characterised in that urea
Solution inlet port pipe is provided with the 3rd valve on (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710509546.3A CN107188198A (en) | 2017-06-28 | 2017-06-28 | A kind of thermal power plant's denitration is pyrolyzed with hydrolysis of urea and is combined ammonia system processed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710509546.3A CN107188198A (en) | 2017-06-28 | 2017-06-28 | A kind of thermal power plant's denitration is pyrolyzed with hydrolysis of urea and is combined ammonia system processed |
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| Publication Number | Publication Date |
|---|---|
| CN107188198A true CN107188198A (en) | 2017-09-22 |
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|---|---|---|---|
| CN201710509546.3A Pending CN107188198A (en) | 2017-06-28 | 2017-06-28 | A kind of thermal power plant's denitration is pyrolyzed with hydrolysis of urea and is combined ammonia system processed |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3587758A1 (en) * | 2018-06-28 | 2020-01-01 | Dr Pley Engineering & Consulting (Bucharest) SRL | Reactor for the thermohydrolysis of urea |
| CN110759409A (en) * | 2019-11-29 | 2020-02-07 | 大唐郓城发电有限公司 | Multiple-effect utilization system for urea hydrolysis process and working method thereof |
| CN111908486A (en) * | 2020-09-14 | 2020-11-10 | 中国华电科工集团有限公司 | Urea hydrolysis device |
| CN112588089A (en) * | 2020-11-23 | 2021-04-02 | 西安西热锅炉环保工程有限公司 | Urea hydrolysis ammonia production product gas dewatering system based on alcohols absorption technology |
| CN113788484A (en) * | 2021-10-11 | 2021-12-14 | 西安热工研究院有限公司 | Urea hydrolysis product gas purification system and method |
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| JP2009285578A (en) * | 2008-05-29 | 2009-12-10 | Babcock Hitachi Kk | Operation method of hydrolysis separator |
| CN103482649A (en) * | 2013-09-05 | 2014-01-01 | 西安热工研究院有限公司 | Urea solution hydrolysis reactor |
| CN103979575A (en) * | 2014-05-16 | 2014-08-13 | 北京博智伟德环保科技有限公司 | System and control method for producing ammonia gas by hydrolyzing urea solution |
| CN104383786A (en) * | 2014-09-27 | 2015-03-04 | 安徽金禾实业股份有限公司 | Method for separating ammonia carbon in melamine tail gas |
| CN206886695U (en) * | 2017-06-28 | 2018-01-16 | 西安热工研究院有限公司 | A kind of thermal power plant's denitration hydrolysis of urea is pyrolyzed compound ammonia system processed |
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2017
- 2017-06-28 CN CN201710509546.3A patent/CN107188198A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2009285578A (en) * | 2008-05-29 | 2009-12-10 | Babcock Hitachi Kk | Operation method of hydrolysis separator |
| CN103482649A (en) * | 2013-09-05 | 2014-01-01 | 西安热工研究院有限公司 | Urea solution hydrolysis reactor |
| CN103979575A (en) * | 2014-05-16 | 2014-08-13 | 北京博智伟德环保科技有限公司 | System and control method for producing ammonia gas by hydrolyzing urea solution |
| CN104383786A (en) * | 2014-09-27 | 2015-03-04 | 安徽金禾实业股份有限公司 | Method for separating ammonia carbon in melamine tail gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3587758A1 (en) * | 2018-06-28 | 2020-01-01 | Dr Pley Engineering & Consulting (Bucharest) SRL | Reactor for the thermohydrolysis of urea |
| CN110759409A (en) * | 2019-11-29 | 2020-02-07 | 大唐郓城发电有限公司 | Multiple-effect utilization system for urea hydrolysis process and working method thereof |
| CN111908486A (en) * | 2020-09-14 | 2020-11-10 | 中国华电科工集团有限公司 | Urea hydrolysis device |
| CN112588089A (en) * | 2020-11-23 | 2021-04-02 | 西安西热锅炉环保工程有限公司 | Urea hydrolysis ammonia production product gas dewatering system based on alcohols absorption technology |
| CN113788484A (en) * | 2021-10-11 | 2021-12-14 | 西安热工研究院有限公司 | Urea hydrolysis product gas purification system and method |
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Application publication date: 20170922 |