CN109939565A - A kind of lithium bromide hierarchical arrangement coupling denitrating system and its working method - Google Patents
A kind of lithium bromide hierarchical arrangement coupling denitrating system and its working method Download PDFInfo
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- CN109939565A CN109939565A CN201910210898.8A CN201910210898A CN109939565A CN 109939565 A CN109939565 A CN 109939565A CN 201910210898 A CN201910210898 A CN 201910210898A CN 109939565 A CN109939565 A CN 109939565A
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- lithium bromide
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- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Abstract
The present invention relates to a kind of lithium bromide hierarchical arrangement coupling denitrating system and its working methods, belong to internal combustion engine energy source station denitrating flue gas field.In the present invention, internal combustion engine outlet is sequentially arranged first order lithium bromide chiller, Medium temperature SCR reaction system, second level lithium bromide chiller.The part of smoke of internal combustion engine discharge enters first order lithium bromide chiller and carries out heat exchange refrigeration or heating, another part flue gas is mixed by the flue gas bypassed with first order lithium bromide chiller comes out makes mixing temperature reach 340 ± 20 DEG C through flow control valve adjusting flow, completes denitration reaction subsequently into SCR denitration reaction device.The denitration technology of technology maturation and economic and reliable is applied in internal combustion engine denitration by the present invention, can achieve the purpose that flue gas NOx efficient removal, and smaller to lithium bromide chiller influence on system operation.
Description
Technical field
Inventive combustion engine energy source station denitrating flue gas field, more particularly to suitable for the high exhaust gas temperature of gas internal-combustion engine
SCR gas denitrifying technology.
Background technique
Internal combustion engine drives electrical power generators using natural gas or fuel oil as fuel, by burning, generates high-grade electric energy, stablizes
Postrun smoke evacuation exhaust temperature is generally at 400 DEG C or more (normal operating temperature is at 450 DEG C or so), and internal combustion engine cylinder jacket water
At 90 DEG C or more, to make full use of the flue gas of engine exhaust and the temperature of jacket water, cigarette is generally arranged in temperature after internal combustion engine
Gas hot water lithium bromide unit realizes summer system using the heat of high-temperature flue gas and jacket water as the heat source of lithium bromide chiller
Cold and winter heating.
Since combustion in IC engine uses piston compression ignition mode, unit itself can not achieve low nitrogen burning, lead to tail gas of discharging fume
Middle NOx emission mass concentration is higher, generally in 200mg/m3More than, remote super Air Pollutant Emission requirement.In atmosphere pollution day
Under the serious form of benefit, it is extremely urgent to reduce Air Pollutant Emission mass concentration, and NOx emission is Air Pollutant Emission
In an important index, so, reducing internal combustion engine NOx emission mass concentration also will be combined supply system based on internal combustion engine
An important content.
Selective catalytic reduction (SCR) is current domestic denitration mainstream technology, principle be under the effect of the catalyst,
With NH3It for reducing agent, is selectively reacted at high temperature with the NOx in flue gas, generates nontoxic, free of contamination nitrogen and water,
Such as application No. is 201811200846.4 Chinese patents.The temperature window of general SCR catalyst (middle temperature catalyst) is 300 DEG C
~ 400 DEG C, gas internal-combustion engine exhaust gas temperature exceeds the adaptive temperature range of middle temperature catalyst.Therefore internal combustion engine flue gas needs to use
(350 DEG C ~ 450 DEG C) progress denitrations of High-temperature scr catalyst, however High-temperature scr catalyst is at high price, operation expense is high,
And technology is not mature enough, it is difficult to carry out large-scale engineering popularization.
Increasingly stringent with atmosphere pollutants emission standards, reducing internal combustion engine NOx emission concentration will be with internal combustion engine
One important content of main combined supply system, traditional SCR technology is mature, and denitration efficiency is high and operation and maintenance cost is low,
It is the first choice of denitration renovation technique.Middling temperature DeNOx temperature window is 300 DEG C ~ 400 DEG C, and internal combustion engine exhaust gas temperature is generally high
It is run under 400 DEG C, middle temperature catalyst long term high temperature environment, not only denitration efficiency is not high, but also its service life also greatly shortens.
Therefore, how the internal combustion engine that the low middle temperature catalyst of technology maturation, investment operating cost is applied to high smoke temperature to be arranged
It is the important topic studied at present in gas.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and provide a kind of lithium bromide hierarchical arrangement
Denitrating system and its working method are coupled, to solve the above problems, the present invention, by lithium bromide chiller hierarchical arrangement, Medium temperature SCR is de-
Nitre system is arranged between two-stage lithium bromide chiller, creates the temperature window of middling temperature DeNOx.The system can reach ideal
Denitration effect, and the performance of lithium bromide chiller is not influenced.
Technical solution used by the present invention solves the above problems is: a kind of lithium bromide hierarchical arrangement coupling denitrating system,
It is characterised in that it includes internal combustion engine, first order lithium bromide chiller, middling temperature DeNOx system, second level lithium bromide chiller and cigarette
Chimney；Smoke evacuation outlet, first order lithium bromide chiller, middling temperature DeNOx system, second level lithium bromide chiller and the cigarette of the internal combustion engine
Chimney is sequentially communicated, and is provided with gas bypass on the flue of first order lithium bromide chiller, the gas bypass and internal combustion engine
Smoke evacuation outlet be connected to the entrance of middling temperature DeNOx system, and be provided with smoke flow control valve on the gas bypass, use
To control exhaust gas volumn, and then control SCR denitration system inlet flue gas temperature；The entrance of the middling temperature DeNOx system is provided with temperature
Sensor, for monitoring SCR denitration system entrance flue gas temperature.
Furthermore, the middling temperature DeNOx system includes SCR reactor and reducing agent reserve tank, the SCR reaction
Device is arranged between first order lithium bromide chiller and second level lithium bromide chiller, and the reducing agent reserve tank and SCR reactor connect
It connects.
Furthermore, catalyst layer and ammonia-gas spraying device, and reducing agent reserve tank and pressure are provided in the SCR reactor
Contracting air pump is connect with ammonia-gas spraying device, the reducing agent reserve tank and compressed air pump parallel arrangement, the ammonia-gas spraying device
Entrance is provided with reducing agent flow control valve.
Furthermore, the thin-walled catalyst for selecting specific surface area high in catalyst layer.
The working method of the lithium bromide hierarchical arrangement coupling denitrating system is as follows: high-temperature flue gas is arranged out of internal combustion engine
Out, part of smoke enters the progress heat exchange of first order lithium bromide chiller, and another part flue gas passes through gas bypass and first
The flue gas mixing of grade lithium bromide chiller outlet, enters in SCR reactor carry out denitration reaction later；The supply of reducing agent reserve tank is also
Former agent is mixed with the compressed air that compressed air pump provides, and is sprayed into SCR reactor by ammonia-gas spraying device and is mixed with flue gas, enters later
Catalyst layer completes denitration reaction, and reducing agent flow control valve controls the amount of reducing agent；Smoke flow control valve controls by flue gas
Flue gas flow in road, while temperature sensor monitors flue-gas temperature, so that the flue-gas temperature into SCR reactor maintains 340
Between ± 20 DEG C, the flue gas after completing denitration reaction enters in the lithium bromide chiller of the second level, is finally discharged by chimney.
Compared with prior art, the present invention having the following advantages that and effect:
1, structure of the invention is reasonable, arranges easy for installation.
2, the present invention uses middling temperature DeNOx mode, is transformed and operation expense is low, denitration efficiency is high, technology maturation
And lithium bromide chiller is influenced little.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention.
In figure: internal combustion engine 1, smoke flow control valve 2, first order lithium bromide chiller 3, temperature sensor 4, catalyst layer 5,
Ammonia-gas spraying device 6, second level lithium bromide chiller 7, reducing agent flow control valve 8, compressed air pump 9, reducing agent reserve tank 10, SCR
Reactor 11, chimney 12.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1, the lithium bromide hierarchical arrangement in the present embodiment couples denitrating system, including internal combustion engine 1, first order bromination
Lithium unit 3, middling temperature DeNOx system, second level lithium bromide chiller 7 and chimney 12.
The smoke evacuation outlet of internal combustion engine 1, first order lithium bromide chiller 3, middling temperature DeNOx system, second level lithium bromide chiller 7
Be sequentially communicated with chimney 12, and be provided with gas bypass on the flue of first order lithium bromide chiller 3, the gas bypass with
The smoke evacuation outlet of internal combustion engine 1 is connected to the entrance of middling temperature DeNOx system, and flue gas flow control is provided on the gas bypass
Valve 2 processed to control exhaust gas volumn, and then controls SCR denitration system inlet flue gas temperature；The entrance of middling temperature DeNOx system is provided with
Temperature sensor 4, for monitoring SCR denitration system entrance flue gas temperature.
Middling temperature DeNOx system includes SCR reactor 11 and reducing agent reserve tank 10, and SCR reactor 11 is arranged first
Between grade lithium bromide chiller 3 and second level lithium bromide chiller 7, reducing agent reserve tank 10 is connect with SCR reactor 11.
Catalyst layer 5 and ammonia-gas spraying device 6, and reducing agent reserve tank 10 and compressed air pump 9 are provided in SCR reactor 11
It is connect with ammonia-gas spraying device 6, reducing agent reserve tank 10 and compressed air pump 9 are arranged in parallel, and the entrance of ammonia-gas spraying device 6 is provided with also
Former agent flux control valve 8.
The thin-walled catalyst for selecting specific surface area high in catalyst layer 5.
The working method that lithium bromide hierarchical arrangement couples denitrating system is as follows: high-temperature flue gas is discharged out of internal combustion engine 1, and one
Divide flue gas to enter first order lithium bromide chiller 3 and carry out heat exchange, another part flue gas is by gas bypass and first order bromination
The flue gas mixing that lithium unit 3 exports, enters in SCR reactor 11 carry out denitration reaction later；The supply of reducing agent reserve tank 10 is also
Former agent is mixed with the compressed air that compressed air pump 9 provides, and is sprayed into SCR reactor 11 by ammonia-gas spraying device 6 and is mixed with flue gas, later
Denitration reaction is completed into catalyst layer 5, reducing agent flow control valve 8 controls the amount of reducing agent；Smoke flow control valve 2 controls
Flue gas flow in gas bypass, while temperature sensor 4 monitors flue-gas temperature, so that into the flue-gas temperature of SCR reactor 11
It maintains between 340 ± 20 DEG C in (denitration reaction optimum temperature section), the flue gas after completing denitration reaction enters second level bromination
In lithium unit 7, finally it is discharged by chimney 12.
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (4)
1. a kind of lithium bromide hierarchical arrangement couples denitrating system, which is characterized in that including internal combustion engine (1), first order lithium bromide machine
Group (3), middling temperature DeNOx system, second level lithium bromide chiller (7) and chimney (12)；The smoke evacuation outlet of the internal combustion engine (1),
First order lithium bromide chiller (3), middling temperature DeNOx system, second level lithium bromide chiller (7) and chimney (12) are sequentially communicated, and
It is provided with gas bypass on the flue of first order lithium bromide chiller (3), the gas bypass and the smoke evacuation of internal combustion engine (1) go out
Mouthful be connected to the entrance of middling temperature DeNOx system, and be provided with smoke flow control valve (2) on the gas bypass, it is described in
The entrance of warm SCR denitration system is provided with temperature sensor (4).
2. lithium bromide hierarchical arrangement according to claim 1 couples denitrating system, which is characterized in that the Medium temperature SCR is de-
Nitre system includes SCR reactor (11) and reducing agent reserve tank (10), and the SCR reactor (11) is arranged in first order lithium bromide
Between unit (3) and second level lithium bromide chiller (7), the reducing agent reserve tank (10) connect with SCR reactor (11).
3. lithium bromide hierarchical arrangement according to claim 2 couples denitrating system, which is characterized in that the SCR reactor
(11) catalyst layer (5) and ammonia-gas spraying device (6) are provided in, and reducing agent reserve tank (10) and compressed air pump (9) with spray
Ammonia device (6) connection, the reducing agent reserve tank (10) and compressed air pump (9) parallel arrangement, ammonia-gas spraying device (6) enter
Mouth is provided with reducing agent flow control valve (8).
4. a kind of working method of lithium bromide hierarchical arrangement coupling denitrating system as claimed in any one of claims 1-3,
Be characterized in that, process is as follows: high-temperature flue gas discharge, part of smoke out of internal combustion engine (1) enter first order lithium bromide chiller (3)
Heat exchange is carried out, another part flue gas is mixed by gas bypass with the flue gas that first order lithium bromide chiller (3) exports, later
Into progress denitration reaction in SCR reactor (11)；Reducing agent reserve tank (10) supplies reducing agent and compressed air pump (9) provide
Compressed air mixing, spray into SCR reactor (11) by ammonia-gas spraying device (6) and mix with flue gas, it is complete into catalyst layer (5) later
At denitration reaction, reducing agent flow control valve (8) controls the amount of reducing agent；Smoke flow control valve (2) controls in gas bypass
Flue gas flow, while temperature sensor (4) monitors flue-gas temperature, so that the flue-gas temperature into SCR reactor (11) maintains
Between 340 ± 20 DEG C, the flue gas after completing denitration reaction enters in second level lithium bromide chiller (7), is finally arranged by chimney (12)
Out.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910210898.8A CN109939565A (en) | 2019-03-20 | 2019-03-20 | A kind of lithium bromide hierarchical arrangement coupling denitrating system and its working method |
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| CN201910210898.8A CN109939565A (en) | 2019-03-20 | 2019-03-20 | A kind of lithium bromide hierarchical arrangement coupling denitrating system and its working method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204933221U (en) * | 2015-07-28 | 2016-01-06 | 中国华电工程(集团)有限公司 | A kind of denitrating flue gas treatment system in conjunction with distributed system |
| CN108049946A (en) * | 2018-01-31 | 2018-05-18 | 华电电力科学研究院有限公司 | A kind of efficient control system of gas internal-combustion engine nitrogen oxides and control method |
| CN210171228U (en) * | 2019-03-20 | 2020-03-24 | 华电电力科学研究院有限公司 | Lithium bromide is arranged coupling deNOx systems in grades |
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- 2019-03-20 CN CN201910210898.8A patent/CN109939565A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204933221U (en) * | 2015-07-28 | 2016-01-06 | 中国华电工程(集团)有限公司 | A kind of denitrating flue gas treatment system in conjunction with distributed system |
| CN108049946A (en) * | 2018-01-31 | 2018-05-18 | 华电电力科学研究院有限公司 | A kind of efficient control system of gas internal-combustion engine nitrogen oxides and control method |
| CN210171228U (en) * | 2019-03-20 | 2020-03-24 | 华电电力科学研究院有限公司 | Lithium bromide is arranged coupling deNOx systems in grades |
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