CN202527070U - Direct flue gas pyrolysis urea solution ammonia preparing device for flue gas denitrification - Google Patents
Direct flue gas pyrolysis urea solution ammonia preparing device for flue gas denitrification Download PDFInfo
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- CN202527070U CN202527070U CN2012201489806U CN201220148980U CN202527070U CN 202527070 U CN202527070 U CN 202527070U CN 2012201489806 U CN2012201489806 U CN 2012201489806U CN 201220148980 U CN201220148980 U CN 201220148980U CN 202527070 U CN202527070 U CN 202527070U
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- flue gas
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Abstract
The utility model discloses a direct flue gas pyrolysis urea solution ammonia preparing device for flue gas denitrification. The device comprises a dust collector, a pyrolysis flue gas pipeline, a pyrolysis pressurization fan, a fresh air pressurization fan, a urea solution storage tank, a booster pump, a urea solution pipeline and a spray gun; the inlet of the pyrolysis pressurization fan is communicated with a top flue, and the outlet of the pyrolysis pressurization fan and the outlet of the fresh air pressurization fan are connected to the air input end of the pyrolysis flue gas pipeline; the urea solution storage tank is connected with the inlet of the booster pump, and the outlet of the booster pump is connected with the spray gun through the urea solution pipeline; the spray gun is inserted into the pyrolysis flue gas pipeline, and a nozzle of the spray gun extends into the pyrolysis flue gas pipeline; and the outlet of the pyrolysis flue gas pipeline is communicated with a front inlet flue of a selective catalytic reduction (SCR) flue gas denitrification reactor. The dust collector is connected in series between the inlet of the pyrolysis pressurization fan and the top flue. The direct flue gas pyrolysis urea solution ammonia preparing device for the flue gas denitrification does not require an external heat source, and is easy to implement and energy-saving.
Description
Technical field
The utility model belongs to flue gas nitrogen oxide and reduces discharging (denitration) technical field, relates to a kind of direct pyrolysis urea liquid of flue gas ammonia-preparing device that is used for denitrating flue gas.
Background technology
Flue gas SCR (SCR) denitrating technique is the major technique of present denitrating flue gas.SCR technology is under catalyst action, and the selective reduction reaction takes place the NO in amino reductive and the flue gas, makes it to generate N
2And water, thereby pollution abatement.For guaranteeing to mix and reaction effect, require amino reductive to adopt ammonia-spraying grid evenly to spray in the flue, so the general liquefied ammonia that is easy to evaporate that adopts of its reducing agent with gaseous form.But liquefied ammonia belongs to hazardous chemical, and its transportation, storage all have strict restriction, all brings more inconvenience to initial stage construction and operational management, increases construction investment and operating cost, and brings potential safety hazard and environmental pollution risk for power plant and neighboring area.
In the prior art,, then need earlier, make to become gaseous ammonia molecules and spray into flue again the urea pyrolysis if use urea to make reducing agent.U.S. FUEL TECH has a cover urea pyrolysis Ammonia Process patented technology, and its major technique means are in the pyrolysis chamber of uniqueness, utilize natural gas or fuel oil that outdoor air heating back pyrolysis urea liquid is processed gaseous ammonia.This technological shortcoming is to adopt natural gas or fuel oil as thermal source, and operating cost is high.Pyrolysis chamber's complex structure, investment is big.
In the Chinese patent document; (the number of patent application: be directly to spray into the solid urea powder in the flue 201010582020.6) that " directly sprays urea method SCR flue-gas denitration process and device "; Utilize flue-gas temperature that the urea pyrolysis is become gaseous ammonia, the cigarette temperature is on the low side, and the pyrolysis effect is not really desirable;
" a kind of process for producing ammonia from urea and system thereof that is used for denitration of boiler smoke " (number of patent application: 201010252649.4) be the improvement of U.S. FUEL TECH being overlapped urea pyrolysis Ammonia Process patented technology; Utilize the high-temperature flue gas heating to process pyrolysis wind natural wind; Utilize the pyrolysis chamber of U.S. FUEL TECH company design to carry out the urea liquid pyrolysis then; Thereby this method also has pyrolysis chamber's complex structure, invests big shortcoming.
The utility model content
The utility model technical problem to be solved provides a kind of direct pyrolysis urea liquid of flue gas ammonia-preparing device that is used for denitrating flue gas, and this direct pyrolysis urea liquid of flue gas ammonia-preparing device that is used for denitrating flue gas need not external heat source, easy to implement and energy efficient.
The technical solution of utility model is following:
A kind of direct pyrolysis urea liquid of flue gas ammonia-preparing device that is used for denitrating flue gas comprises pyrolysis smoke pipeline, pyrolysis booster fan, new wind booster fan, urea liquid basin, force (forcing) pump, urea liquid pipeline and spray gun;
The inlet of pyrolysis booster fan communicates with the top flue of boiler furnace, and the air input of pyrolysis smoke pipeline is all received in the outlet of the outlet of pyrolysis booster fan and new wind booster fan;
The inlet of urea liquid basin and force (forcing) pump joins, and the pressurization delivery side of pump connects spray gun through the urea liquid pipeline; Spray gun is inserted on the pyrolysis smoke pipeline, and the nozzle of spray gun stretches in the pyrolysis smoke pipeline; The outlet of pyrolysis smoke pipeline communicates with the preceding inlet flue duct of SCR flue gas denitration reactor.
Between the inlet of pyrolysis booster fan and top flue, be serially connected with deduster.
Be equipped with the adjusting air-valve on described pyrolysis booster fan and new wind booster fan and the pipeline that the pyrolysis smoke pipeline is connected.
On the urea liquid pipeline, be provided with solution metering distribution system.
The gun barrel of spray gun is provided with compressed air inlet.
Described spray gun is a plurality of.
The lime-ash pipe of deduster is connected to the boiler ash removal system.
The pyrolysis smoke pipeline is provided with one section spray gun stationary pipes, and the porch of spray gun stationary pipes is provided with the spray gun mounting flange.
Beneficial effect:
The direct pyrolysis urea liquid of the flue gas that the is used for denitrating flue gas ammonia-preparing device of the utility model, replace liquefied ammonia to make the SCR denitrification reducing agent with urea liquid after, eliminated a particularly big potential safety hazard and an environmental risk of city power plant of power plant, thereby safe.
In addition, the utility model utilizes the high-temperature flue gas of boiler itself that the urea liquid pyrolysis is become gaseous ammonia, thereby needn't introduce external heat sources such as natural gas or fuel oil, saves operating cost, and has simplified denitrating system, reduces investment, makes things convenient for operational management.
Description of drawings
Fig. 1 is the direct pyrolysis urea liquid of the flue gas ammonia-preparing device general structure sketch map that is used for denitrating flue gas;
Fig. 2 is the spray gun structure sketch map.
Label declaration: 1: boiler furnace; The 2:SCR catalytic reactor; 3: deduster; 4: the pyrolysis booster fan; 5: regulate air-valve; 6: the pyrolysis smoke air channel; 7: ammonia-spraying grid; 8: spray gun; 9: solution metering distributor; 10: the urea liquid pipeline; 11: force (forcing) pump; 12: the urea liquid basin; 13: the spray gun stationary pipes; 14: the spray gun mounting flange; 15: lance tube; 16: the urea liquid import; 17: compressed air inlet; 18: nozzle; 19: new wind booster fan.
The specific embodiment
Below will combine accompanying drawing and specific embodiment that the utility model is explained further details:
Embodiment 1:
As shown in Figure 1, a kind of direct pyrolysis urea liquid of flue gas ammonia-preparing device that is used for denitrating flue gas comprises deduster, pyrolysis smoke pipeline, pyrolysis booster fan, new wind booster fan, urea liquid basin, force (forcing) pump, urea liquid pipeline and spray gun;
The inlet of pyrolysis booster fan communicates with the top flue, and the air input of pyrolysis smoke pipeline is all received in the outlet of the outlet of pyrolysis booster fan and new wind booster fan;
The inlet of urea liquid basin and force (forcing) pump joins, and the pressurization delivery side of pump connects spray gun through the urea liquid pipeline; Spray gun is inserted on the pyrolysis smoke pipeline, and the nozzle of spray gun stretches in the pyrolysis smoke pipeline; The outlet of pyrolysis smoke pipeline communicates with the preceding inlet flue duct of SCR flue gas denitration reactor.
Deduster is serially connected between the inlet and top flue of pyrolysis booster fan.Deduster lime-ash pipe is connected to the boiler ash removal system.
Be equipped with the adjusting air-valve on described pyrolysis booster fan and new wind booster fan and the pipeline that the pyrolysis smoke pipeline is connected.
On the urea liquid pipeline, be provided with solution metering distribution system.
The gun barrel of spray gun is provided with compressed air inlet.
Described spray gun is a plurality of.
Course of work explanation:
Flue is drawn pyrolysis wind from the boiler top; Behind deduster; By the pressurization of pyrolysis booster fan, new wind booster fan replenishes cold wind to regulate air quantity and temperature, is directly delivered to the ammonia-spraying grid (ammonia-spraying grid is the original parts of existing equipment for denitrifying flue gas) of flue gas SCR denitration device by the air channel;
The 30%-50% urea liquid for preparing is stored in the basin, through urea solution pump pressurization and metering distributor control flow, is sprayed in the above-mentioned pyrolysis wind after dedusting by atomizing lance;
The at high temperature rapid pyrolysis of urea liquid after the atomizing becomes gaseous ammonia; Reach concentration less than 5% safety index; In ammonia-spraying grid (AIG) evenly sprays into Benitration reactor air inlet flue; Fully mix with flue gas through blender,, under catalyst action, the NO in the flue gas is reduced into N via evenly getting into Benitration reactor behind deflector and the rectifier
2, accomplish denitrification process.
The pyrolysis booster fan all adopts frequency conversion fan with new wind booster fan, through VFC pyrolysis air quantity, to be complementary with the required urea liquid amount that sprays into of denitration.
As shown in Figure 2, for making the urea liquid atomizing better, the urea liquid spray gun adds the compressed air assisted atomization, and spray gun can freely insert or extract out maintenance, and nozzle is replaceable.
As shown in Figure 2, for making the urea liquid atomizing better, spray gun adds the compressed air assisted atomization, and spray gun can freely insert or extract out maintenance, and nozzle is replaceable.The pyrolysis smoke air channel is provided with one section spray gun stationary pipes, and the porch of spray gun stationary pipes is provided with the spray gun mounting flange.
The above has only described basic implementation process, is not the restriction to implementation process.The those skilled in the art also can make other multi-form variations on the basis of above-mentioned explanation; This explanation can't also need not the variation of all embodiments is all listed, and the conspicuous version of being drawn thus all is in the protection domain of the utility model.
Claims (8)
1. the direct pyrolysis urea liquid of a flue gas ammonia-preparing device that is used for denitrating flue gas is characterized in that, comprises pyrolysis smoke pipeline, pyrolysis booster fan, new wind booster fan, urea liquid basin, force (forcing) pump, urea liquid pipeline and spray gun;
The inlet of pyrolysis booster fan communicates with the top flue of boiler furnace, and the air input of pyrolysis smoke pipeline is all received in the outlet of the outlet of pyrolysis booster fan and new wind booster fan;
The inlet of urea liquid basin and force (forcing) pump joins, and the pressurization delivery side of pump connects spray gun through the urea liquid pipeline; Spray gun is inserted on the pyrolysis smoke pipeline, and the nozzle of spray gun stretches in the pyrolysis smoke pipeline; The outlet of pyrolysis smoke pipeline communicates with the preceding inlet flue duct of SCR flue gas denitration reactor.
2. the direct pyrolysis urea liquid of the flue gas ammonia-preparing device that is used for denitrating flue gas according to claim 1 is characterized in that, between the inlet of pyrolysis booster fan and top flue, is serially connected with deduster.
3. the direct pyrolysis urea liquid of the flue gas ammonia-preparing device that is used for denitrating flue gas according to claim 1 is characterized in that, is equipped with the adjusting air-valve on described pyrolysis booster fan and new wind booster fan and the pipeline that the pyrolysis smoke pipeline is connected.
4. the direct pyrolysis urea liquid of the flue gas ammonia-preparing device that is used for denitrating flue gas according to claim 1 is characterized in that, on the urea liquid pipeline, is provided with solution metering distribution system.
5. the direct pyrolysis urea liquid of the flue gas ammonia-preparing device that is used for denitrating flue gas according to claim 1 is characterized in that the gun barrel of spray gun is provided with compressed air inlet.
6. the direct pyrolysis urea liquid of the flue gas ammonia-preparing device that is used for denitrating flue gas according to claim 1 is characterized in that described spray gun is a plurality of.
7. the direct pyrolysis urea liquid of the flue gas ammonia-preparing device that is used for denitrating flue gas according to claim 2 is characterized in that the lime-ash pipe of deduster is connected to the boiler ash removal system.
8. according to each the described direct pyrolysis urea liquid of flue gas ammonia-preparing device that is used for denitrating flue gas of claim 1-7, it is characterized in that the pyrolysis smoke pipeline is provided with one section spray gun stationary pipes, the porch of spray gun stationary pipes is provided with the spray gun mounting flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201489806U CN202527070U (en) | 2012-04-11 | 2012-04-11 | Direct flue gas pyrolysis urea solution ammonia preparing device for flue gas denitrification |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012201489806U CN202527070U (en) | 2012-04-11 | 2012-04-11 | Direct flue gas pyrolysis urea solution ammonia preparing device for flue gas denitrification |
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| CN202527070U true CN202527070U (en) | 2012-11-14 |
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| CN2012201489806U Expired - Lifetime CN202527070U (en) | 2012-04-11 | 2012-04-11 | Direct flue gas pyrolysis urea solution ammonia preparing device for flue gas denitrification |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551034A (en) * | 2013-11-05 | 2014-02-05 | 国家电网公司 | Urea-pyrolysis ammonia preparation device |
| CN106955593A (en) * | 2017-04-17 | 2017-07-18 | 西安西热锅炉环保工程有限公司 | A kind of two-fluid spray gun structure suitable for chimney flue type urea direct-injection pyrolytic process |
-
2012
- 2012-04-11 CN CN2012201489806U patent/CN202527070U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551034A (en) * | 2013-11-05 | 2014-02-05 | 国家电网公司 | Urea-pyrolysis ammonia preparation device |
| CN106955593A (en) * | 2017-04-17 | 2017-07-18 | 西安西热锅炉环保工程有限公司 | A kind of two-fluid spray gun structure suitable for chimney flue type urea direct-injection pyrolytic process |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121114 |