CN208406637U - A kind of hydrolysis of urea denitrating system ammonia-gas spraying device heating dilution wind - Google Patents
A kind of hydrolysis of urea denitrating system ammonia-gas spraying device heating dilution wind Download PDFInfo
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- CN208406637U CN208406637U CN201820983980.5U CN201820983980U CN208406637U CN 208406637 U CN208406637 U CN 208406637U CN 201820983980 U CN201820983980 U CN 201820983980U CN 208406637 U CN208406637 U CN 208406637U
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Abstract
The utility model discloses the hydrolysis of urea denitrating system ammonia-gas spraying devices that one kind can heat dilution wind.The utility model includes dilution air, ammonia air mixer, ammonia air header, ammonia-spraying grid, disturbed flow pipe, flue, cold wind collector, hot wind collector and contact header；The cold wind collector and hot wind collector is located at the side of flue, and the contact header is located at the other side of flue；The ammonia-spraying grid and disturbed flow pipe is located in flue, and the disturbed flow pipe includes upper layer disturbed flow pipe and lower layer's disturbed flow pipe, is respectively positioned on above ammonia-spraying grid；Dilution wind and hydrolysis of urea product gas after reheating are sent to ammonia air header after evenly mixing in the ammonia air mixer, then distribute to each ammonia-spraying grid.The shortcomings that the utility model utilizes residual heat from boiler fume, does not increase any other heat source, heats to dilution wind, meets denitrating system to dilution wind minimum temperature requirement, can overcome existing denitration dilution air heating device energy consumption is high.
Description
Technical field
The utility model relates to smoke pollution of boiler controlling device fields, specifically a kind of to heat the urine for diluting wind
Element hydrolysis denitrating system ammonia-gas spraying device.
Background technique
For the coal burning of coal-fired power plant along with the discharge of a large amount of nitrogen oxides (NOx), nitrogen oxides (NOx) is main
One of atmosphere pollution wanted.With the publication of " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011), to fire coal
The requirement of the emission limit of power-plant flue gas pollutant NOx is increasingly stringenter.National Energy Board in 2014, National Development and Reform Committee and environmental protection
Three, portion combines and promulgated " coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-2020) ", clear stipulaties each department
Newly-built Thermal generation unit Air Pollutant Emission mass concentration must basically reach gas turbine standard limit value, i.e., in benchmark oxysome
Under conditions of fraction is 6%, the concentration of emission of sulfur dioxide, flue dust and nitrogen oxides will be lower than 35mg/m respectively3、10mg/m3
And 50mg/m3Minimum discharge index.
Denitrating flue gas is the effective ways of NOx in the control fire coal boiler fume being widely used both at home and abroad, coal-burning power plant's hair
The motor group overwhelming majority is all provided with equipment for denitrifying flue gas, selective catalytic reduction (SCR) be it is most widely used at present, most at
Ripe reliable, the highest gas denitrifying technology of denitration efficiency, most fire coal boiler fume denitrations all uses should in the world at present
Technology.And the reducing agent employed in SCR denitration technology can choose liquefied ammonia, ammonium hydroxide and urea.Since liquefied ammonia is cheap,
Operating cost is low, and the SCR denitration device of early stage mostly uses liquefied ammonia evaporation technology, but since liquefied ammonia has toxicity and corrosivity, and
Readily volatilized, there are biggish security risks, belong to major hazard source, transport and storage have special regulation, by stringent
Control.Ammonia density in ammonium hydroxide is lower, and transportation cost is high, and has more metal ion in industrial ammonia, is catalyzed to SCR
The service life of agent has a certain impact, therefore using not extensive in the SCR denitration device of coal fired power plant.Urea is a kind of nontoxic
Harmless solid particle, transport, storage safety convenient, environmental sound.The considerations of for safety and practicability, in order to overcome
Security risk existing for the links such as liquefied ammonia transport, discharging, storage, operation, maintenance, the urea ammonia suitable for SCR denitrating flue gas
Technology gradually causes the concern of people.The technology of urea ammonia mainly has urea pyrolysis and two kinds of hydrolysis of urea at present.Compared to heat
Solution ammonia, more thoroughly, no coupling product generates hydrolysis ammonia-preparing process ratio, and energy consumption is small, it is only necessary to which low-grade steam can meet water
The heat demand of reaction is solved, operating cost is low.
The product gas that hydrolysis of urea ammonia generates contains 37.5% ammonia, 43.75% water vapour and 18.75%CO2Gas,
Its temperature is at 130-160 DEG C.Product gas needs to be diluted to the mixed gas containing 5% concentration ammonia with large quantity of air, and room temperature
Dilution wind (air) will lead to the water vapour crystallisation by cooling in product gas, to absorb NH3Become ammonium hydroxide.Such case not only without
Method reaches denitration purpose, and easily corrodes equipment, pipeline, thus dilute wind (air) must heat after for dilute hydrolysis produce
Product gas.Common heating dilution wind process has following three kinds:
As can be seen from the above table, be easy to cause ammonia-spraying grid to block using heat primary air, influence ammonia-gas spraying device it is continuous just
Often operation.Setting steam heater both increases investment and operating cost, it is also contemplated that the arrangement space of steam heater.Setting is empty
There is also similar problems for air preheater.
Utility model content
To solve to dilute wind heating problems in current hydrolysis of urea denitrating system ammonia-gas spraying device, reduce investment outlay and run at
This, the utility model provides the hydrolysis of urea denitrating system ammonia-gas spraying device that one kind can heat dilution wind (air), neither increases auxiliary
Heat source is helped, and does not increase extras, is wanted even if dilution wind (air) minimum temperature can be met in boiler minimum load operating condition
It asks.
The utility model adopts the following technical solutions: a kind of hydrolysis of urea denitrating system spray ammonia dress that can heat dilution wind
It sets comprising dilution air, ammonia air mixer, ammonia air header, ammonia-spraying grid, disturbed flow pipe, flue, cold wind collect
Case, hot wind collector and contact header；The cold wind collector and hot wind collector is located at the side of flue, the connection
Network header is located at the other side of flue；The ammonia-spraying grid and disturbed flow pipe is located in flue, and the disturbed flow pipe includes upper layer
Disturbed flow pipe and lower layer's disturbed flow pipe are respectively positioned on above ammonia-spraying grid；
The dilution air is sent to cold wind collector for wind is diluted, and then distributes to lower layer's disturbed flow pipe, in disturbed flow pipe
Dilution wind heated for the first time through boiler smoke, subsequently into contact header, and be assigned to the disturbed flow pipe of upper layer, through boiler smoke
Enter hot wind collector after second of heating of gas, is then sent through ammonia air mixer air intake；
Dilution wind after reheating uniformly mixes in the ammonia air mixer with hydrolysis of urea product gas
After be sent to ammonia air header, then distribute to each ammonia-spraying grid, spray into flue, into downstream denitration after mix with flue gas
In reactor.
The disturbed flow pipe is arranged in the top of ammonia-spraying grid in flue, and be mainly used for ammonia-spraying grid ejection is diluted to one
Determine concentration ammonia and boiler smoke flow-disturbing so that the ammonia of denitration reactor inlet mixed with flue gas it is more uniform.
Another function of the disturbed flow pipe is using the high-temperature boiler flue gas in flue to (empty by dilution wind therein
Gas) it is heated.According to the requirement of the size and dilution wind (air) temperature of dilution wind (air) flow can once add
Heat, reheating even heating for multiple times, meet minimum requirements of the denitrating system to dilution wind (air) temperature.
Supplement as above-mentioned technical proposal, lower layer's disturbed flow pipe have 1-4 layers, one end of lower layer's disturbed flow pipe and cold wind
Collector communicates, and the other end is communicated with contact header, and the entrance of cold wind collector is communicated with the air outlet of dilution air.
Supplement as above-mentioned technical proposal, the upper layer disturbed flow pipe have 1-4 layers, one end of upper layer disturbed flow pipe and hot wind
Collector communicates, and the other end is communicated with contact header, and hot wind collector is communicated with the air intake of ammonia air mixer.
Supplement as above-mentioned technical proposal, between the cold wind collector and hot wind collector be equipped with partition, with every
Dilution wind (air) from heating front and back, the partition position can be adjusted according to operating condition.
The utility model has the beneficial effect that the utility model using boiler smoke heating dilution wind (air), phase
It is utilized when in fume afterheat, does not increase any auxiliary thermal source, boiler thermal efficiency can be improved；Ammonia-spraying grid is directly utilized simultaneously
On disturbed flow pipe as heating tube, do not increase extras, flue gas crushing does not also obviously increase, and saves the throwing of ammonia-gas spraying device
Money and operating cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Icon explanation: 1 is dilution air, and 2 be ammonia air mixer, and 3 be ammonia air header, and 4 be ammonia-spraying grid, 5
It is flue for disturbed flow pipe, 6,7a is cold wind collector, and 7b hot wind collector, 8 be contact header, and 9 be partition.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of hydrolysis of urea denitrating system ammonia-gas spraying device that can heat dilution wind, including dilution air 1, ammonia
Gas air mixer 2, ammonia air header 3, ammonia-spraying grid 4, disturbed flow pipe 5, flue 6, cold wind collector 7a, hot wind collector 7b
And contact header 8.
The cold wind collector 7a and hot wind collector 7b is located at the side of flue 6, and the contact header 8 is located at cigarette
The other side in road 6；Partition 9 is equipped between the cold wind collector 7a and hot wind collector 7b.It the ammonia-spraying grid 4 and disturbs
Flow tube 5 is located in flue 6, and the disturbed flow pipe is respectively positioned on spray ammonia through flue, including upper layer disturbed flow pipe and lower layer's disturbed flow pipe
Above grid.
Lower layer's disturbed flow pipe has 2 layers, and one end of lower layer's disturbed flow pipe is communicated with cold wind collector 7a, the other end and contact
Header 8 communicates, and the entrance of cold wind collector 7a is communicated with the air outlet of dilution wind .1.
The upper layer disturbed flow pipe has 2 layers, and one end of upper layer disturbed flow pipe is communicated with hot wind collector 7b, the other end and contact
Header 8 communicates, and hot wind collector 7b is communicated with the air intake of ammonia air mixer 2.
Dilution wind (air) is sent to cold wind collector 7a by the pressurization of dilution air 1, then distributes to being arranged in lower layer's flow-disturbing
In pipe, dilution wind in disturbed flow pipe heats for the first time through boiler smoke, subsequently into contact header 8, and is assigned to being arranged in
In the disturbed flow pipe of upper layer, enter hot wind collector 7b after second of boiler smoke is heated, the dilution wind after reheating is (empty
Gas) temperature control between 190-270 DEG C, be then sent through 2 air intake of ammonia air mixer.
Dilution wind (air) and hydrolysis of urea product gas (ammonia accounts for about 37.5%) after reheating is in the ammonia
Ammonia air header 3 is sent in gas air mixer 2 after evenly mixing, then distributes to each ammonia-spraying grid 4, sprays into flue 6
It is interior, enter in the Benitration reactor of downstream after being mixed with flue gas.
The disturbed flow pipe 5 is arranged in the top of ammonia-spraying grid 4 in flue 6, is mainly used for the dilution of the ejection of ammonia-spraying grid 4
To certain density ammonia and boiler smoke flow-disturbing so that the ammonia of denitration reactor inlet mixed with flue gas it is more uniform.
Another function of disturbed flow pipe 5 is using the high-temperature boiler flue gas in flue to (empty by dilution wind therein
Gas) it is heated.According to the requirement of the size and dilution wind (air) temperature of dilution wind (air) flow can once add
Heat, reheating even heating for multiple times, meet minimum requirements of the denitrating system to dilution wind (air) temperature.
Described dilution wind (air) heat source is only the high-temperature boiler flue gas in flue, does not set auxiliary thermal source separately.
The minimum requirements of described heated rear dilution wind (air) temperature, in boiler minimum load, ammonia air
Mixer entrance dilutes air temperature and is not less than 190 DEG C.
The utility model utilizes residual heat from boiler fume, does not increase any other heat source, heats to dilution wind (air),
Meet denitrating system to dilution wind (air) minimum temperature requirement, existing denitration dilution wind (air) heating device energy consumption can be overcome
Big disadvantage；Heat exchanger is not set separately, and the occupied area of heat exchanger can be reduced while reducing investment outlay.Pass through reasonable Arrangement flow-disturbing
Pipe, in the case where not increasing flue gas resistance, reduces the operating cost of ammonia-gas spraying device, has a vast market application prospect.
As described above, although having indicated and having expressed the utility model referring to specific preferred embodiments, it must not
It is construed to the limitation to the utility model itself.In the spirit and scope for not departing from the utility model that appended claims define
Under the premise of, it can various changes can be made in the form and details to it.
Claims (4)
1. one kind can heat dilution wind hydrolysis of urea denitrating system ammonia-gas spraying device, which is characterized in that including dilution air (1),
Ammonia air mixer (2), ammonia air header (3), ammonia-spraying grid (4), disturbed flow pipe (5), flue (6), cold wind collector
(7a), hot wind collector (7b) and contact header (8)；The cold wind collector (7a) and hot wind collector (7b) is located at cigarette
The side in road (6), the contact header (8) are located at the other side of flue (6)；The ammonia-spraying grid (4) and disturbed flow pipe (5)
In flue (6), the disturbed flow pipe (5) includes upper layer disturbed flow pipe and lower layer's disturbed flow pipe, is respectively positioned on ammonia-spraying grid (4)
Side；
The dilution air is sent to cold wind collector for wind is diluted, and then distributes to lower layer's disturbed flow pipe, dilute in disturbed flow pipe
It releases wind and is heated for the first time through boiler smoke, subsequently into contact header, and is assigned to the disturbed flow pipe of upper layer, through boiler smoke the
Enter hot wind collector after reheating, is then sent through ammonia air mixer air intake；
Dilution wind after reheating is sent in the ammonia air mixer after evenly mixing with hydrolysis of urea product gas
To ammonia air header, then distributes to each ammonia-spraying grid, spray into flue, downstream denitration reaction is entered after mixing with flue gas
In device.
2. the hydrolysis of urea denitrating system ammonia-gas spraying device according to claim 1 for heating dilution wind, which is characterized in that institute
The lower layer's disturbed flow pipe stated has 1-4 layers, and one end of lower layer's disturbed flow pipe is communicated with cold wind collector (7a), the other end and contact header
(8) it communicates, the entrance of cold wind collector (7a) is communicated with the air outlet of dilution air (1).
3. the hydrolysis of urea denitrating system ammonia-gas spraying device according to claim 1 for heating dilution wind, which is characterized in that institute
The upper layer disturbed flow pipe stated has 1-4 layers, and one end of upper layer disturbed flow pipe is communicated with hot wind collector (7b), the other end and contact header
(8) it communicates, hot wind collector (7b) is communicated with the air intake of ammonia air mixer (2).
4. the hydrolysis of urea denitrating system ammonia-gas spraying device according to claim 1-3 for heating dilution wind, special
Sign is, is equipped with partition (9) between the cold wind collector (7a) and hot wind collector (7b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820983980.5U CN208406637U (en) | 2018-06-25 | 2018-06-25 | A kind of hydrolysis of urea denitrating system ammonia-gas spraying device heating dilution wind |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820983980.5U CN208406637U (en) | 2018-06-25 | 2018-06-25 | A kind of hydrolysis of urea denitrating system ammonia-gas spraying device heating dilution wind |
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| CN208406637U true CN208406637U (en) | 2019-01-22 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN112999833A (en) * | 2019-12-18 | 2021-06-22 | 大唐环境产业集团股份有限公司 | Urea hydrolysis dilution wind denitration waste heat recovery device |
| CN113586959A (en) * | 2021-05-28 | 2021-11-02 | 大唐长春第三热电厂 | Dustless dilution air ammonia supply anti-blocking system |
-
2018
- 2018-06-25 CN CN201820983980.5U patent/CN208406637U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112999833A (en) * | 2019-12-18 | 2021-06-22 | 大唐环境产业集团股份有限公司 | Urea hydrolysis dilution wind denitration waste heat recovery 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 |
| CN113586959A (en) * | 2021-05-28 | 2021-11-02 | 大唐长春第三热电厂 | Dustless dilution air ammonia supply anti-blocking system |
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