CN109453665A - A kind of urea liquid pyrolysis installation and method applied to denitrating system - Google Patents
A kind of urea liquid pyrolysis installation and method applied to denitrating system Download PDFInfo
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- CN109453665A CN109453665A CN201811200724.5A CN201811200724A CN109453665A CN 109453665 A CN109453665 A CN 109453665A CN 201811200724 A CN201811200724 A CN 201811200724A CN 109453665 A CN109453665 A CN 109453665A
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- China
- Prior art keywords
- urea liquid
- flue
- electric heater
- connect
- denitrating system
- Prior art date
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 239000004202 carbamide Substances 0.000 title claims abstract description 67
- 239000007788 liquid Substances 0.000 title claims abstract description 66
- 238000000197 pyrolysis Methods 0.000 title claims abstract description 42
- 238000009434 installation Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 14
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims abstract description 45
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000003546 flue gas Substances 0.000 claims abstract description 43
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 34
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 238000002485 combustion reaction Methods 0.000 claims abstract description 17
- 239000003345 natural gas Substances 0.000 claims abstract description 17
- 238000000889 atomisation Methods 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000002955 isolation Methods 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 5
- 239000007921 spray Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000000153 supplemental effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of urea liquid pyrolysis installations applied to denitrating system, including combustion of natural gas power device, SCR reactor and lithium bromide chiller, combustion of natural gas power device is connect by flue with SCR reactor, SCR reactor is connect with lithium bromide chiller, lithium bromide chiller is connect with cryogenic heat exchanger, and cryogenic heat exchanger is connect with chimney, and electric heater is provided in flue, electric heater front end is provided with injection apparatus, and injection apparatus is connect with fluid reservoir.The invention also discloses a kind of methods of raising urea liquid pyrolysis efficiency.The present invention is by being arranged electric heater after the injection pipe in flue, and by electric heater by the flue gas in flue to 450 DEG C or more, the pyrolysis efficiency of atomization urea liquid is improved using the higher flue gas of temperature, ammonia is promoted to be formed, improves denitrating flue gas effect.Compared with the mode of conventional heating normal temperature air, using the denitrating system more energy saving of urea liquid pyrolysis installation of the present invention.Present device is simple, and engineering cost is low.
Description
Technical field
The present invention relates to a kind of urea liquid pyrolysis installations and method applied to denitrating system, belong to denitration technology neck
Domain.
Background technique
In distributed energy denitrating system engineering, mixed using the flue gas in system with the urea liquid of atomization, to mention
The pyrolysis efficiency of high urea liquid, and the temperature of the flue gas mixed in Practical Project with atomization urea liquid is lower, thus to mention
The pyrolysis efficiency of high urea liquid is mixed as supplemental heat source with the urea liquid of atomization after heating normal temperature air, but is added
Hot normal temperature air institute calorific requirement is big, and energy consumption is high.
Summary of the invention
The object of the present invention is to provide a kind of urea liquid pyrolysis installations applied to denitrating system, which can
The pyrolysis efficiency of urea liquid after being atomized is improved, ammonia is promoted to be formed, does not need heating normal temperature air as supplemental heat source, energy consumption
It is low.
In order to solve the above technical problems, the present invention adopts the following technical scheme that: a kind of urea applied to denitrating system
Solution pyrolysis installation, including combustion of natural gas power device, SCR reactor and lithium bromide chiller, combustion of natural gas power device
It being connect by flue with SCR reactor, SCR reactor is connect with lithium bromide chiller, and lithium bromide chiller is connect with cryogenic heat exchanger,
Cryogenic heat exchanger is connect with chimney, and electric heater is provided in flue, and electric heater front end is provided with injection apparatus, injection apparatus
It is connect with fluid reservoir.
Combustion of natural gas power device includes gas turbine and internal combustion engine, is a kind of for being external conveying electric energy and thermal energy
Device.Pyrolysis forms ammonia after urea liquid mixes in flue with the flue gas from combustion of natural gas power device.
SCR reactor is used to the NOx contained in flue gas being reduced into N2, point of SCR reactor is entered by flow straightening grid
The uniform flue gas of cloth realizes denitration reduction reaction, NOx is reduced into N under the effect of the catalyst2.Pass through lithium bromide chiller reality
Now to the UTILIZATION OF VESIDUAL HEAT IN of the higher flue gas of temperature after denitration.
It is provided with temperature sensitive member on electric heater, when sensing that flue-gas temperature is lower than 450 DEG C in flue, then starts
Electric heater heats flue gas.
Cryogenic heat exchanger is used to further decrease the temperature for the flue gas being discharged from lithium bromide chiller, cools down through cryogenic heat exchanger
Flue gas Xiang great Qi is arranged by chimney.
In a kind of urea liquid pyrolysis installation applied to denitrating system above-mentioned, isolation is provided on the electric heater
Cover, electric heater is netted in a ring, and isolation cover is located in the interior ring of ring mesh electric heater.It is set in ring in electric heater
Be equipped with isolation cover, using electric heater can flue gas between heating flue inner wall and isolation cover to 450 DEG C or more, thus high temperature
Urea liquid fast pyrogenation after atomization is formed ammonia by flue gas.
In a kind of urea liquid pyrolysis installation applied to denitrating system above-mentioned, the injection apparatus includes nozzle and defeated
Pipe is sent, the nozzle is connect with delivery pipe, and delivery pipe is connect with fluid reservoir.
In a kind of urea liquid pyrolysis installation applied to denitrating system above-mentioned, metering is provided in the delivery pipe
Pump.Pass through metering pump transport urea solution and the urea liquid of First Astronautic Research Institute for Measurement and Test's conveying.
It further include atomized air tube, atomizing space in a kind of urea liquid pyrolysis installation applied to denitrating system above-mentioned
One end of tracheae is accessed on the pipeline section between the nozzle and metering pump.Atomized air tube is for being passed through atomization into urea liquid
Air, so that urea liquid is atomized, so that urea liquid is converted into gaseous state from liquid.
In a kind of urea liquid pyrolysis installation applied to denitrating system above-mentioned, it is molten that urea is stored in the fluid reservoir
Liquid.
In a kind of urea liquid pyrolysis installation applied to denitrating system above-mentioned, the flue connects with SCR reactor
Flow straightening grid is provided at mouthful.Make flow of flue gas uniform by flow straightening grid, keep the consistency of flue gas flow rate, guarantees denitration
Effect.
A method of it improving urea liquid and is pyrolyzed efficiency, including
Flue gas between heating flue inner wall and isolation cover to 450 DEG C or more,
Metering pump is opened, the urea liquid in fluid reservoir is delivered to by nozzle by delivery pipe, while into urea liquid
It is passed through the atomizing air for being atomized urea liquid, and the urea liquid after atomization is sprayed by nozzle；
A small amount of smoke gas pyrolysis after urea liquid after the atomization sprayed by nozzle is heated in flue forms ammonia,
Flue-gas temperature is higher, and pyrolysis rate is faster, and the ammonia of formation enters SCR reactor after mixing with the flue gas in flue and carries out denitration
Processing.
A kind of method improving urea liquid pyrolysis efficiency above-mentioned, further includes that electric heater is arranged in flue, passes through
Electric heater heats flue gas.
Compared with prior art, the present invention passes through electric heater by the way that electric heater is arranged after the injection pipe in flue
By the flue gas in flue to 450 DEG C or more, the pyrolysis efficiency of atomization urea liquid is improved using the higher flue gas of temperature,
Promote ammonia to be formed, improves denitrating flue gas effect.Compared with the mode of conventional heating normal temperature air, using urea liquid of the present invention
The denitrating system of pyrolysis installation more energy saving.Present device is simple, and engineering cost is low.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of embodiment of the invention；
Fig. 2 is structure arrangement schematic diagram in flue of the present invention；
Fig. 3 is electric heater schematic diagram of the present invention.
Appended drawing reference: 1- combustion of natural gas power device, 2-SCR reactor, 3- lithium bromide chiller, 4- flue, 5- liquid storage
Tank, 6- cryogenic heat exchanger, 7- electric heater, 8- injection apparatus, 9- flow straightening grid, 10- isolation cover, 11- nozzle, 12- delivery pipe,
13- metering pump, 14- atomized air tube.
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
Specific embodiment
Embodiment 1: a kind of urea liquid pyrolysis installation applied to denitrating system, including combustion of natural gas power device 1,
SCR reactor 2 and lithium bromide chiller 5, the combustion of natural gas power device 1 is connect by flue 4 with SCR reactor 2, described
SCR reactor 2 is connect with lithium bromide chiller 5, and the lithium bromide chiller 5 is connect with cryogenic heat exchanger 6, the cryogenic heat exchanger 6
It is connect with chimney, electric heater 7 is provided in the flue 4,7 front end of electric heater is provided with injection apparatus 8, the spray
Injection device 8 is connect with fluid reservoir 5.
Embodiment 2: a kind of urea liquid pyrolysis installation applied to denitrating system, including combustion of natural gas power device 1,
SCR reactor 2 and lithium bromide chiller 5, the combustion of natural gas power device 1 is connect by flue 4 with SCR reactor 2, described
SCR reactor 2 is connect with lithium bromide chiller 5, and the lithium bromide chiller 5 is connect with cryogenic heat exchanger 6, the cryogenic heat exchanger 6
It is connect with chimney, electric heater 7 is provided in the flue 4,7 front end of electric heater is provided with injection apparatus 8, the spray
Injection device 8 is connect with fluid reservoir 5.Isolation cover 10 is provided on electric heater 7, electric heater 7 is netted in a ring, and isolation cover 10
In in the interior ring of ring mesh electric heater 7.Injection apparatus 8 includes nozzle 11 and delivery pipe 12, the nozzle 11 and conveying
Pipe 12 connects, and delivery pipe 12 is connect with fluid reservoir 5.
Embodiment 3: a kind of urea liquid pyrolysis installation applied to denitrating system, including combustion of natural gas power device 1,
SCR reactor 2 and lithium bromide chiller 5, the combustion of natural gas power device 1 is connect by flue 4 with SCR reactor 2, described
SCR reactor 2 is connect with lithium bromide chiller 5, and the lithium bromide chiller 5 is connect with cryogenic heat exchanger 6, the cryogenic heat exchanger 6
It is connect with chimney, electric heater 7 is provided in the flue 4,7 front end of electric heater is provided with injection apparatus 8, the spray
Injection device 8 is connect with the fluid reservoir 5 for being stored with urea liquid.Isolation cover 10 is provided on electric heater 7, electric heater 7 is in ring
Shape is netted, and isolation cover 10 is located in the interior ring of ring mesh electric heater 7.Injection apparatus 8 includes nozzle 11 and delivery pipe 12,
The nozzle 11 is connect with delivery pipe 12, and delivery pipe 12 is connect with fluid reservoir 5.Metering pump 13 is provided in delivery pipe 12.Also wrap
Atomized air tube 14 is included, one end of atomized air tube 14 is accessed on the pipeline section between the nozzle 11 and metering pump 13.Flue 4 with
The interface of SCR reactor 2 is provided with flow straightening grid 9.Make flow of flue gas uniform by flow straightening grid 9, keeps flue gas flow rate
Consistency, improve denitration effect.
Embodiment 4: a method of it improving urea liquid and is pyrolyzed efficiency, including between heating flue inner wall and isolation cover
Flue gas is to 450 DEG C or more；Metering pump is opened, the urea liquid in fluid reservoir is delivered to by nozzle by delivery pipe, while to urine
It is passed through the atomizing air for being atomized urea liquid in plain solution, and the urea liquid after atomization is sprayed by nozzle；Pass through spray
Mouth spray atomization after urea liquid be heated in flue after a small amount of smoke gas pyrolysis, formed ammonia, the ammonia of formation with
Enter SCR reactor after flue gas mixing in flue and carries out denitration process.Further include that electric heater is set in flue, passes through electricity
Heater heats flue gas.
The working principle of urea liquid pyrolysis installation of the present invention: after natural gas burns in combustion of natural gas power device 1
Flue gas is generated, flue gas enters in flue 4, and the flue gas passed through before 4 inner wall of flue and isolation cover 10 is arranged on 4 inner wall of flue
Electric heater 7 between isolation cover 10 heats, and so that a small amount of flue-gas temperature is risen to 450 DEG C or more, utilizes this small amount of 450 DEG C or more
Flue gas improve the pyrolysis efficiency of urea liquid after atomization, urea liquid is sprayed into flue 4 by nozzle 11 after atomization, and urea
The ammonia formed after solution pyrolysis is discharged into SCR reactor after uniformly rectifying after mixing with the flue gas in flue 4 by flow straightening grid 9
2.Denitration process is carried out using SCR reactor 2, the NOx in flue gas is reduced into N2(ammonia).Flue-gas temperature after denitration process
It is also relatively high, a small amount of heat in flue gas is obtained by lithium bromide chiller 3, for refrigeration or heat supply, realizes UTILIZATION OF VESIDUAL HEAT IN.Lithium bromide
The flue-gas temperature come out in unit 3 can also be utilized further, be further decreased flue-gas temperature using cryogenic heat exchanger 6, so
Xiang great Qi is arranged by chimney afterwards.
Claims (9)
1. a kind of urea liquid pyrolysis installation applied to denitrating system, which is characterized in that including combustion of natural gas power device
(1), SCR reactor (2) and lithium bromide chiller (3), the combustion of natural gas power device (1) are reacted by flue (4) with SCR
Device (2) connection, the SCR reactor (2) connect with lithium bromide chiller (3), the lithium bromide chiller (3) and cryogenic heat exchanger
(6) it connects, the cryogenic heat exchanger (6) connect with chimney, is provided with electric heater (7), the electric heating in the flue (4)
Device (7) front end is provided with injection apparatus (8), and the injection apparatus (8) connect with fluid reservoir (5).
2. a kind of urea liquid pyrolysis installation applied to denitrating system according to claim 1, which is characterized in that described
It is provided on electric heater (7) isolation cover (10), the electric heater (7) is netted in a ring, and isolation cover (10) is located at ring network
In the interior ring of shape electric heater (7).
3. a kind of urea liquid pyrolysis installation applied to denitrating system according to claim 2, which is characterized in that described
Injection apparatus (8) includes nozzle (11) and delivery pipe (12), and the nozzle (11) connect with delivery pipe (12), delivery pipe (12) with
Fluid reservoir (5) connection.
4. a kind of urea liquid pyrolysis installation applied to denitrating system according to claim 3, which is characterized in that described
Metering pump (13) are provided in delivery pipe (12).
5. a kind of urea liquid pyrolysis installation applied to denitrating system according to claim 4, which is characterized in that also wrap
It includes atomized air tube (14), the pipe between the nozzle (11) and metering pump (13) is accessed in one end of the atomized air tube (14)
Duan Shang.
6. a kind of urea liquid pyrolysis installation applied to denitrating system according to claim 5, which is characterized in that described
Fluid reservoir is stored with urea liquid in (5).
7. a kind of urea liquid pyrolysis installation applied to denitrating system according to claim 6, which is characterized in that described
Flue (4) and the interface of SCR reactor (2) are provided with flow straightening grid (9).
8. using the raising urea liquid pyrolysis of the urea liquid pyrolysis installation as described in any claim in claim 1~7
The method of efficiency, which is characterized in that including
Flue gas between heating flue inner wall and isolation cover is to 450 DEG C or more；
Metering pump is opened, the urea liquid in fluid reservoir is delivered to by nozzle by delivery pipe, while being passed through into urea liquid
The urea liquid after atomization is sprayed for being atomized the atomizing air of urea liquid, and by nozzle；
A small amount of smoke gas pyrolysis after being heated in flue by the urea liquid after the atomization of nozzle ejection, forms ammonia, shape
At ammonia mixed with the flue gas in flue after enter SCR reactor carry out denitration process.
9. improving the method for urea liquid pyrolysis efficiency as claimed in claim 8, which is characterized in that further include being set in flue
Electric heater is set, flue gas is heated by electric heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811200724.5A CN109453665A (en) | 2018-10-16 | 2018-10-16 | A kind of urea liquid pyrolysis installation and method applied to denitrating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811200724.5A CN109453665A (en) | 2018-10-16 | 2018-10-16 | A kind of urea liquid pyrolysis installation and method applied to denitrating system |
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| Publication Number | Publication Date |
|---|---|
| CN109453665A true CN109453665A (en) | 2019-03-12 |
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ID=65607629
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| CN201811200724.5A Pending CN109453665A (en) | 2018-10-16 | 2018-10-16 | A kind of urea liquid pyrolysis installation and method applied to denitrating system |
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Application publication date: 20190312 |