CN209108905U - A kind of double loop integrated flue gas denitrating system suitable for depth peak regulation combustion engine unit - Google Patents
A kind of double loop integrated flue gas denitrating system suitable for depth peak regulation combustion engine unit Download PDFInfo
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- CN209108905U CN209108905U CN201821538389.5U CN201821538389U CN209108905U CN 209108905 U CN209108905 U CN 209108905U CN 201821538389 U CN201821538389 U CN 201821538389U CN 209108905 U CN209108905 U CN 209108905U
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- flue gas
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Abstract
The utility model discloses a kind of double loop integrated flue gas denitrating system suitable for depth peak regulation combustion engine unit, which includes combustion engine single cycle denitrating flue gas circuit, Gas-steam Combined Cycle denitrating flue gas circuit and SCR equipment for denitrifying flue gas；The inlet end in the combustion engine single cycle denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas circuit is connect with combustion engine exhaust pass respectively, and the outlet side in the combustion engine single cycle denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas circuit is connect with SCR equipment for denitrifying flue gas gas approach respectively.The utility model is integrated by combustion engine single cycle denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas circuit, under the switching of combustion engine depth peak regulation, combined cycle and single cycle both of which or waste heat utilization equipment fault condition, still it is well positioned to meet the requirement of environment protection standard discharge, and urea liquid is injected directly by combustion engine exhaust pass using spray gun, reduce equipment failure rate.
Description
Technical field
The utility model relates to a kind of double loop integrated flue gas denitrating systems suitable for depth peak regulation combustion engine unit, belong to
The improvement field of combustion engine flue gas pollutant NOx.
Background technique
Although combustion engine can be generated NOx and be caused centainly to pollute to environment using more clean fuel, while to meet
Atmosphere pollution controls more stringent standard requirements, administer gesture must to combustion engine pollutant using equipment for denitrifying flue gas
Row.
Combustion engine has the characteristics that start and stop speed is fast, operational flexibility is high, is widely used in variable load plant, wherein with combustion
Gas-steam combined cycle power generating mode is using more.Combustion engine variable load plant is needed often in depth peaking operation under underload,
The switching of Gas-steam Combined Cycle Yu single cycle both of which should be able to be also realized simultaneously.Conventional gas-steam combined is followed
The equipment for denitrifying flue gas of ring fuel engine power generation unit is typically arranged in waste heat boiler, is switched in combustion engine depth peak regulation and both of which
In the case of, it is more difficult to realize the qualified discharge of environmental protection.
Combustion engine denitrification reducing agent includes urea, liquefied ammonia, three kinds of ammonium hydroxide, is considered for security standpoint, and urea is as reduction
Agent is most widely used at home.Process for producing ammonia from urea generally uses conventional urea pyrolysis method, i.e., design has urea in system
Pyrolysis oven, urea liquid enter urea pyrolysis furnace easy for feed pump, metered dispensing unit, atomizer etc. through urea, are urinating
It is mixed in plain pyrolysis oven with the high-temperature flue gas attracted from combustion engine outlet, pyrolysis generates NH3、H2O and CO2, decomposition product sprays into de- again
Nitre system.The system is complex, urea pyrolysis furnace high failure rate.
In conclusion in the prior art under combustion engine depth peak regulation and both of which switch instances, it is more difficult to realize ring
The problem of qualified discharge of guarantor, urea pyrolysis furnace system is complicated, high failure rate, still shortage effective solution scheme.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of suitable for depth peak regulation combustion engine unit
Double loop integrated flue gas denitrating system, realize the needs of environment protection standard discharge, and be injected directly into urea liquid using spray gun
Combustion engine exhaust pass reduces equipment failure rate.
The technical scheme adopted by the utility model is
A kind of double loop integrated flue gas denitrating system suitable for depth peak regulation combustion engine unit, the system include that combustion engine list follows
Ring denitrating flue gas circuit, Gas-steam Combined Cycle denitrating flue gas circuit and SCR equipment for denitrifying flue gas；The combustion engine single cycle
The inlet end in denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas circuit is connect with combustion engine exhaust pass respectively, institute
State the outlet side in combustion engine single cycle denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas circuit respectively with SCR flue gas
The connection of denitrification apparatus gas approach.
As further limiting for the utility model, the combustion engine single cycle denitrating flue gas circuit includes combustion engine single cycle cigarette
The inlet end of qi exhaustion nitre pipeline, the combustion engine single cycle denitrating flue gas pipeline is connect with combustion engine exhaust pass, and the combustion engine list follows
The outlet side of ring denitrating flue gas pipeline is connect with SCR equipment for denitrifying flue gas gas approach.
As further limiting for the utility model, Gas-steam Combined Cycle denitrating flue gas circuit includes waste heat
The import of boiler and flue gas heat-exchange unit, the waste heat boiler is connect by waste heat boiler air inlet pipeline with combustion engine exhaust pass, institute
State waste heat boiler outlet and flue gas heat-exchange unit the first gas inlet connect, the first exhanst gas outlet of the flue gas heat-exchange unit with
SCR equipment for denitrifying flue gas gas approach connection, the second gas inlet and the second exhanst gas outlet of the flue gas heat-exchange unit respectively with
Heat boiler outlet flue gas and combustion engine exiting flue gas are carried out hot friendship by flue gas heat-exchange unit by the connection of waste heat boiler air inlet pipeline
It changes.
As further limiting for the utility model, in the second exhanst gas outlet and waste heat boiler air inlet pipe of flue gas heat-exchange unit
Smoke temperature controllable register is provided on the pipeline of road connection.
As further limiting for the utility model, on combustion engine exhaust pass and SCR equipment for denitrifying flue gas gas approach
It is respectively arranged with flue gas switching valve, it is de- for realizing combustion engine single cycle denitrating flue gas circuit and Gas-steam Combined Cycle flue gas
The switching in nitre circuit.
It further include urea injection apparatus as further limiting for the utility model, the urea injection apparatus includes urine
Element dissolution case, charging pump, metered dose dispensers and several setting urea liquid spray gun, described urea on combustion engine exhaust pass are molten
Urea liquid is delivered to metered dose dispensers by charging pump in solution case, and metered dose dispensers distribute urea liquid molten to each urea
Liquid spray gun, urea liquid spray gun will spray into combustion engine exhaust pass after solution atomization.
As further limiting for the utility model, static mixer is additionally provided on combustion engine exhaust pass, it is described quiet
State mixer is located at combustion engine using the internal mechanical disturbing flow device being made of several turbulence blades, the urea liquid spray gun
Outlet, the static mixer are located at urea liquid spray gun downstream.
As further limiting for the utility model, the gas access of the urea liquid spray gun is connected with compressed air hose
Road inputs compressed air into urea liquid spray gun.
As further limiting for the utility model, the SCR equipment for denitrifying flue gas includes SCR reactor, and the SCR is anti-
It answers in device and has been sequentially arranged fairing and catalyst along flow of flue gas direction, be provided with cigarette at the top of the SCR reactor
Chimney.
As further limiting for the utility model, the catalyst is one or two layers.
Compared with prior art, the utility model has the beneficial effects that
(1) the utility model can be suitable for combustion engine depth peak regulation, combined cycle and the switching or remaining of single cycle both of which
In the case of heat utilization equipment fault, it is still well positioned to meet the requirement of environment protection standard discharge；
(2) heat boiler outlet flue gas and combustion engine exiting flue gas are carried out hot friendship using flue gas heat-exchange unit by the utility model
It changes, while being provided with smoke temperature controllable register, there is good temperature regulating power, guarantee denitrating flue gas in suitable humidity province
Between；
(3) the utility model is injected directly into the urea pyrolysis scheme of combustion engine exhaust pass using urea liquid, reduces equipment
Failure rate；
(4) the utility model is by combustion engine single cycle denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas circuit
It is integrated in one, denitration efficiency is high, and has good regulation performance, and system is simple, reliable；
(5) the utility model realizes flue gas under combustion engine single cycle denitrating flue gas and combined cycle by switching valve on flue
The switching of denitration.
Detailed description of the invention
Fig. 1 is the disclosed double loop integrated flue gas denitration for being suitable for depth peak regulation combustion engine unit of the utility model embodiment
System structure diagram；
In figure, 1, combustion engine, 2, waste heat boiler, the 3, first flue gas switching valve, 4, smoke temperature controllable register, 5, flue gas heat-exchange unit,
6, the second flue gas switching valve, 7, SCR reactor, 8, catalyst, 9, fairing, 10, chimney, 11, urea liquid spray gun, 12,
Static mixer, 13, metered dispensing unit, 14, urea dissolution case, 15. charging pumps, 16, combustion engine single cycle denitrating flue gas pipeline,
17, combustion engine exhaust pass, 18, SCR equipment for denitrifying flue gas gas approach.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal",
The orientation or positional relationship of the instructions such as " side ", "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate chatting
The relative for stating each component of the utility model or component structure relationship and determination, not refer in particular in the utility model either component or
Element should not be understood as limiting the present invention.
In the utility model, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and expression can be fixation
Connection, is also possible to be integrally connected or be detachably connected；It can be directly connected, the indirect phase of intermediary can also be passed through
Even.Related scientific research or technical staff for this field can determine as the case may be above-mentioned term in the present invention
Concrete meaning, should not be understood as limiting the present invention.
To adapt to the peak regulation operating condition of combustion engine complexity, while considering Gas-steam Combined Cycle and single cycle both of which
The case where switching or waste heat utilization equipment failure, the utility model provides a kind of double back suitable for depth peak regulation combustion engine unit
Road integrated flue gas denitrating system realizes combustion engine in the switching of depth peak regulation, combined cycle and single cycle both of which or UTILIZATION OF VESIDUAL HEAT IN
In the case of equipment fault, it is still well positioned to meet the requirement of environment protection standard discharge, by denitration under conventional combustion engine single cycle operating condition
Denitrating system under system and combined cycle operating condition is integrated in one, and denitration efficiency is high, and has good regulation performance, system
Simply, reliably.
As shown in Figure 1, the double loop integrated flue gas denitrating system includes that two denitrating flue gas circuits and SCR denitrating flue gas fill
It sets；Two denitrating flue gas circuits are respectively that combustion engine single cycle denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas return
Road；Denitration reaction is completed using same set of SCR equipment for denitrifying flue gas in two denitrating flue gas circuits.
The combustion engine single cycle denitrating flue gas circuit includes combustion engine single cycle denitrating flue gas pipeline 16, the combustion engine single cycle
The inlet end of denitrating flue gas pipeline 16 is connect with combustion engine exhaust pass 17, the outlet of the combustion engine single cycle denitrating flue gas pipeline 16
End is connect with SCR equipment for denitrifying flue gas gas approach 18.
Under the operating condition of combustion engine single cycle denitrating flue gas circuit, the flue gas that combustion engine 1 generates is through combustion engine exhaust pass 17, combustion engine
Single cycle denitrating flue gas pipeline 16 enters SCR equipment for denitrifying flue gas, completes under the action of catalyst in SCR equipment for denitrifying flue gas
NH3N is produced with reacting for NOx2And H2O is discharged into atmosphere through chimney.
Gas-steam Combined Cycle denitrating flue gas circuit includes that waste heat boiler 2, flue gas heat-exchange unit 5 and smoke temperature are adjusted
The import of baffle 4, the waste heat boiler 2 is connect by waste heat boiler air inlet pipeline with combustion engine exhaust pass 16, the waste heat pot
The outlet of furnace 2 is connect with the first gas inlet of flue gas heat-exchange unit 5, the first exhanst gas outlet and SCR cigarette of the flue gas heat-exchange unit 5
Qi exhaustion nitre device portal flue 18 connect, the second gas inlet and the second exhanst gas outlet of the flue gas heat-exchange unit 5 respectively with it is remaining
Heat boiler outlet flue gas and combustion engine exiting flue gas are carried out heat exchange by flue gas heat-exchange unit by the connection of heat boiler air inlet pipeline；
Smoke temperature controllable register is provided on the pipeline that second exhanst gas outlet of the flue gas heat-exchange unit 5 is connect with waste heat boiler air inlet pipeline
4, for exchanging heat smoke temperature at outlet of waste heat boiler in the reaction temperature section run to catalyst.
Under the operating condition of Gas-steam Combined Cycle denitrating flue gas circuit, the flue gas that combustion engine generates is through combustion engine exhaust pass
17 are introduced into waste heat boiler 2, then enter back into Benitration reactor, complete to be discharged into atmosphere through chimney after denitration reaction.To protect
Suitable reaction temperature in Benitration reactor is demonstrate,proved, the utility model is set in the Gas-steam Combined Cycle denitrating flue gas circuit
Flue gas heat-exchange unit 5 has been set, heat boiler outlet flue gas and combustion engine exiting flue gas are subjected to heat exchange, while being provided with smoke temperature adjusting
Baffle 4 exchanges heat smoke temperature at outlet of waste heat boiler in the reaction temperature section run to catalyst.
In order to realize the switching in two denitrating flue gas circuits, the first flue gas switching valve is provided on combustion engine exhaust pass 17
3, the Single port of the first flue gas switching valve 3 is connect with the inlet end of combustion engine single cycle denitrating flue gas pipeline 16, another port
It is connect with waste heat boiler air inlet pipeline；Second flue gas switching valve 6 is set on SCR equipment for denitrifying flue gas gas approach, described
The first of the Single port and combustion engine single cycle denitrating flue gas piping connection of two flue gas switching valves 6, another port and flue gas heat-exchange unit
Exhanst gas outlet connection, may be implemented the switching of denitrating flue gas under combustion engine single cycle denitrating flue gas and combined cycle.
The SCR equipment for denitrifying flue gas mainly includes SCR reactor 7, catalyst 8, fairing 9 etc., the catalyst
8, for the installation of fairing 9 in SCR reactor 7, the sequence along flue gas direction is followed successively by fairing 9, catalyst 8.It is described to urge
Agent 8 is by 1 layer or 1+1 layers setting, i.e., 1 layer 1 layer of operation is spare, and spare level is installed again when needed.The SCR reactor 7
Top is provided with chimney 10.
Preferably, the catalyst that the SCR equipment for denitrifying flue gas is selected is high temperature molecular sieve catalyst, is existed using temperature
300~600 DEG C, this kind of catalyst catalytic activity with higher and wider active temperature range.Under the effect of the catalyst
Reduction reaction occurs in reactor for nitrogen oxides and reducing agent, produces N2And H2O。
The applicable denitrification reducing agent of the utility model includes urea, liquefied ammonia, ammonium hydroxide etc., and wherein liquefied ammonia, ammonium hydroxide are all made of often
Denitrification reducing agent scheme is advised, the utility model is not described herein.For urea as denitrification reducing agent, the utility model proposes
Prioritization scheme are as follows: several urea liquid spray guns 11 are set on combustion engine exhaust pass, and urea has dissolved in case 14 storage
The urea liquid being configured is delivered to urea solution metering distributor 13 by charging pump 15, passes through metering distribution dress
It sets 13 to distribute urea liquid to each urea liquid spray gun 11, and realizes the metering effectively measured.Pass through urea liquid spray gun
It is sprayed into the suitable combustion engine exhaust pass of temperature after 11 atomizations, the pyrolytic process of urea is completed in combustion engine exhaust pass, generated
NH3、H2O and CO2。
To guarantee being sufficiently mixed for ammonia and flue gas, in 11 downstream of urea liquid spray gun, design has static mixer 12.Institute
Static mixer 12 is stated using the internal mechanical disturbing flow device being made of several turbulence blades, guarantees that ammonia and flue gas are sufficient
Mixing.
The metered dispensing unit 13 uses existing device, such as uses metered dose dispensers.
In the present embodiment, the quantity of the urea liquid spray gun 11 is generally according to the size of exhaust gas volumn and the section of flue
Size selection.To increase atomizing effect, it is connected with compressed air line in the gas access of urea liquid spray gun, to urea liquid
Draw compressed air all the way in spray gun.
To prevent fouling in urea liquid spray gun, demineralized water or softened water are generallyd use as urea dissolution water, dilution
Urea concentration afterwards is in the left and right 50% (wt).
For guarantee urea abundant pyrolysis, urea liquid spray gun 11 be generally disposed at combustion engine outlet, distance SCR reactor compared with
Remote position.
As shown in Figure 1, the utility model proposes the double loop integrated flue gas denitration suitable for depth peak regulation combustion engine unit
System work process are as follows:
When the first flue gas switching valve 3 and the second flue gas switching valve 6 switch to combustion engine single cycle denitrating flue gas circuit operation work
Condition, the flue gas that combustion engine 1 generates enters Benitration reactor 7 through combustion engine exhaust pass and combustion engine single cycle denitrating flue gas circuit, through cigarette
After gas fairing 9 rectifies, NH is completed under the action of catalyst 83H is produced with reacting for NOx2O and N2, through chimney 10
It is discharged into atmosphere.
When the first flue gas switching valve 3 and the second flue gas switching valve 6 switch to Gas-steam Combined Cycle denitrating flue gas circuit
Operating condition, the flue gas that combustion engine 1 generates are introduced into waste heat boiler 2 through combustion engine exhaust pass, and 2 exiting flue gas of waste heat boiler is expelled to
2 exiting flue gas of waste heat boiler and combustion engine exiting flue gas are carried out heat exchange, are passed through by flue gas heat-exchange unit 5 by flue gas heat-exchange unit 5
Smoke temperature controllable register 4 exchanges heat 2 exit gas temperature of waste heat boiler in the reaction temperature section run to catalyst, flue gas heat exchange
Flue gas after the heat exchange of device discharge enters Benitration reactor 7, completes to be discharged into atmosphere through chimney 10 after denitration reaction.
Urea dissolves the urea liquid of 14 configured 50% left and right (wt) concentration of case, is delivered to urea by charging pump 15
Urea liquid is distributed to each urea liquid spray gun 11 by metered dispensing unit 13, is passed through by solution measures distributor 13
It is sprayed into combustion engine exhaust pass after urea spray gun atomization, the pyrolytic process of urea is completed in combustion engine exhaust pass, generate ammonia.
It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but it is not practical new to this
The limitation of type protection scope, those skilled in the art should understand that, based on the technical solution of the present invention, ability
Field technique personnel do not need to make the creative labor the various modifications or changes that can be made still in the protection model of the utility model
Within enclosing.
Claims (10)
1. a kind of double loop integrated flue gas denitrating system suitable for depth peak regulation combustion engine unit, characterized in that including combustion engine list
Circulating flue gas denitration circuit, Gas-steam Combined Cycle denitrating flue gas circuit and SCR equipment for denitrifying flue gas；The combustion engine list follows
The inlet end in ring denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas circuit is connect with combustion engine exhaust pass respectively,
The outlet side in the combustion engine single cycle denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas circuit respectively with SCR cigarette
The connection of qi exhaustion nitre device portal flue.
2. the double loop integrated flue gas denitrating system according to claim 1 suitable for depth peak regulation combustion engine unit, special
Sign is that the combustion engine single cycle denitrating flue gas circuit includes combustion engine single cycle denitrating flue gas pipeline, the combustion engine single cycle flue gas
The inlet end of denitration pipeline is connect with combustion engine exhaust pass, the outlet side of the combustion engine single cycle denitrating flue gas pipeline and SCR cigarette
The connection of qi exhaustion nitre device portal flue.
3. the double loop integrated flue gas denitrating system according to claim 1 suitable for depth peak regulation combustion engine unit, special
Sign is, Gas-steam Combined Cycle denitrating flue gas circuit includes waste heat boiler and flue gas heat-exchange unit, the waste heat boiler
Import is connect by waste heat boiler air inlet pipeline with combustion engine exhaust pass, and the of the outlet of the waste heat boiler and flue gas heat-exchange unit
The connection of one gas inlet, the first exhanst gas outlet of the flue gas heat-exchange unit is connect with SCR equipment for denitrifying flue gas gas approach, described
The second gas inlet and the second exhanst gas outlet of flue gas heat-exchange unit are connect with waste heat boiler air inlet pipeline respectively, pass through flue gas heat exchange
Heat boiler outlet flue gas and combustion engine exiting flue gas are carried out heat exchange by device.
4. the double loop integrated flue gas denitrating system according to claim 3 suitable for depth peak regulation combustion engine unit, special
Sign is, is provided with smoke temperature on the pipeline that connect with waste heat boiler air inlet pipeline of the second exhanst gas outlet of flue gas heat-exchange unit and adjusts gear
Plate.
5. the double loop integrated flue gas denitrating system according to claim 1 suitable for depth peak regulation combustion engine unit, special
Sign is flue gas switching valve to be respectively arranged on combustion engine exhaust pass and SCR equipment for denitrifying flue gas gas approach, for realizing combustion
The switching in machine single cycle denitrating flue gas circuit and Gas-steam Combined Cycle denitrating flue gas circuit.
6. the double loop integrated flue gas denitrating system according to claim 1 suitable for depth peak regulation combustion engine unit, special
Sign be further include urea injection apparatus, if the urea injection apparatus include urea dissolution case, charging pump, metered dose dispensers and
Dry is arranged on combustion engine exhaust pass urea liquid spray gun, and urea liquid is delivered to by charging pump in the urea dissolution case
Metered dose dispensers, metered dose dispensers distribute urea liquid to each urea liquid spray gun, and urea liquid spray gun is by solution atomization
It sprays into combustion engine exhaust pass afterwards.
7. the double loop integrated flue gas denitrating system according to claim 6 suitable for depth peak regulation combustion engine unit, special
Sign is that static mixer is additionally provided on combustion engine exhaust pass, and the static mixer is using inside by several flow perturbation fans
The mechanical disturbing flow device of piece composition, the urea liquid spray gun are located at combustion engine outlet, and it is molten that the static mixer is located at urea
Liquid spray gun downstream.
8. the double loop integrated flue gas denitrating system according to claim 6 suitable for depth peak regulation combustion engine unit, special
Sign is that the gas access of the urea liquid spray gun is connected with compressed air line, and into urea liquid spray gun, input compression is empty
Gas.
9. the double loop integrated flue gas denitrating system according to claim 1 suitable for depth peak regulation combustion engine unit, special
Sign is that the SCR equipment for denitrifying flue gas includes SCR reactor, is sequentially arranged in the SCR reactor along flow of flue gas direction
There are fairing and catalyst, is provided with chimney at the top of the SCR reactor.
10. the double loop integrated flue gas denitrating system according to claim 9 suitable for depth peak regulation combustion engine unit, special
Sign is that the catalyst is one or two layers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821538389.5U CN209108905U (en) | 2018-09-19 | 2018-09-19 | A kind of double loop integrated flue gas denitrating system suitable for depth peak regulation combustion engine unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821538389.5U CN209108905U (en) | 2018-09-19 | 2018-09-19 | A kind of double loop integrated flue gas denitrating system suitable for depth peak regulation combustion engine unit |
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| CN209108905U true CN209108905U (en) | 2019-07-16 |
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| CN201821538389.5U Active CN209108905U (en) | 2018-09-19 | 2018-09-19 | A kind of double loop integrated flue gas denitrating system suitable for depth peak regulation combustion engine unit |
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2018
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