CN204369580U - A kind of urea pyrolysis ammonia system - Google Patents
A kind of urea pyrolysis ammonia system Download PDFInfo
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- CN204369580U CN204369580U CN201420821783.5U CN201420821783U CN204369580U CN 204369580 U CN204369580 U CN 204369580U CN 201420821783 U CN201420821783 U CN 201420821783U CN 204369580 U CN204369580 U CN 204369580U
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- temperature
- pyrolysis oven
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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
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Abstract
The utility model provides a kind of urea pyrolysis ammonia system, comprise hot precipitator, temperature control equipment, pyrolysis oven, be arranged on high-temperature blower between hot precipitator and pyrolysis oven, described thermostatic outlet is connected on the fume pipe of high-temperature blower outlet by cold-air duct and makes cold wind and high-temperature flue gas mixing, mixed cold wind and flue gas are connected to the entrance of pyrolysis oven by pipeline, the entrance and exit of described pyrolysis oven is respectively equipped with temperature point, and described pyrolysis oven is provided with urea nozzle; The utility model is not reducing denitrating system safety in operation with under the prerequisite meeting environmental requirement, the high-temperature flue gas after dedusting is utilized to substitute existing electric airheater, save electric airheater power consumption, eliminate the Air Leakage Into Boilers produced because denitration ammonia sprays into, there is splendid energy-saving effect, reach best ammonia effect processed.
Description
Technical field
The utility model belongs to the apparatus field of ammonia processed, particularly relates to a kind of urea pyrolysis ammonia system.
Background technology
Due to the advantage that urea pyrolysis Ammonia Process transports with it, preparation security is high, apply in the denitrification apparatus of partial fuel coal unit at home, and liquefied ammonia technique affects by carriage of dangerous goods factor and is progressively replaced by process for producing ammonia from urea, and the hot blast in Conventional urea pyrolytic process mainly takes from the outlet hot blast of boiler air preheater, its wind-warm syndrome, generally below 400 DEG C, just can be used for urea pyrolysis ammonia after needing to continue to be warming up to about 600 DEG C with electric heater.This scheme exists that power consumption is large, air enters the problems such as utilization ratio is low after boiler.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of urea pyrolysis ammonia system, and to solve in prior art, power consumption is large, air enters the problems such as utilization ratio is low after boiler.
For achieving the above object and other relevant object, the utility model provides a kind of urea pyrolysis ammonia system.
A kind of urea pyrolysis ammonia system, comprise the hot precipitator that the entrance be arranged on denitrification apparatus platform is communicated to high temperature flue-gas from boiler outlet, entrance is communicated to the temperature control equipment of cold wind source of the gas, pyrolysis oven, be arranged on the high-temperature blower between hot precipitator and pyrolysis oven, described thermostatic outlet is connected on the fume pipe of high-temperature blower outlet by cold-air duct and makes cold wind and high-temperature flue gas mixing, mixed cold wind and high-temperature flue gas are connected to the entrance of pyrolysis oven by pipeline, the outlet of pyrolysis oven is connected to ammonia-spraying grid, the entrance and exit of described pyrolysis oven is respectively equipped with temperature point, described pyrolysis oven is provided with urea nozzle.
As optimal way, described high-temperature blower is high temperature frequency conversion fan.
As optimal way, described temperature control equipment comprises: shut-off valve, by-pass valve and corresponding connecting tube before and after flow control valve, variable valve.The upstream and downstream of variable valve arranges forward and backward shut-off valve respectively, and the upstream of front shut-off valve connects branch road and is provided with the downstream that bypath valve is connected to rear shut-off valve.
As optimal way, the quantity of described nozzle is that 7-9 props up.
As optimal way, the flow of single nozzle is 150kg/h.
As optimal way, the testing tool of described temperature point is thermocouple thermometer.
As optimal way, along pyrolysis oven top centrum and the uniform urea nozzle of lower end, straight section cylindrical shell junction circumference, the spray gun axis of urea nozzle and straight section Barrel alignment intersect vertically and horizontally disposed.
As mentioned above, the utility model has following beneficial effect:
The utility model is applicable to the SCR denitration device with urea pyrolysis system, do not reducing denitrating system safety in operation with under the prerequisite meeting environmental requirement, the high-temperature flue gas after dedusting is utilized to substitute existing electric airheater, save electric airheater power consumption, eliminate the Air Leakage Into Boilers produced because denitration ammonia sprays into, there is splendid energy-saving effect.Native system adopts rationally effective control device to reach best ammonia effect processed, comprises a cold wind and regulates pyrolysis oven temperature in, high temperature frequency conversion fan to regulate reactor outlet temperature, control the generation of monoammonium sulfate, ensure ammonia effect processed.
Accompanying drawing explanation
Fig. 1 is the structural representation of the urea pyrolysis system of the utility model embodiment.
Fig. 2 is the thermostatic structural representation in the urea pyrolysis system of the utility model embodiment.
1-hot precipitator,
2-high-temperature blower,
3-temperature control equipment,
31-flow control valve,
Shut-off valve before 32-,
Shut-off valve after 33-,
34-by-pass valve,
4-pyrolysis oven temperature in measuring point,
5-pyrolysis oven temperature out measuring point,
6-pyrolysis oven,
7-urea nozzle.
Embodiment
By particular specific embodiment, embodiment of the present utility model is described below, person skilled in the art scholar the content disclosed by this specification sheets can understand other advantages of the present utility model and effect easily.
Refer to Fig. 1.In order to can the utility model be described in detail, first, next urea pyrolysis ammonia system of the present utility model is illustrated:
Embodiment 1
The present embodiment provides a kind of urea pyrolysis system, comprise the hot precipitator 1 that the entrance be arranged on denitrification apparatus platform is communicated to high temperature flue-gas from boiler outlet, entrance is communicated to the temperature control equipment 3 of cold wind source of the gas, pyrolysis oven 6, be arranged on the high-temperature blower 2 between hot precipitator 1 and pyrolysis oven 6, the outlet of described temperature control equipment 3 is connected on the fume pipe that high-temperature blower 2 exports by cold-air duct and makes cold wind and high-temperature flue gas mixing, mixed cold wind and high-temperature flue gas are connected to the entrance of pyrolysis oven 6 by pipeline, the outlet of pyrolysis oven 6 is connected to ammonia-spraying grid, the entrance and exit of described pyrolysis oven 6 is respectively equipped with temperature point, described pyrolysis oven 6 is provided with urea nozzle 7.
High-temperature blower 2 is high temperature frequency conversion fan.
Temperature control equipment 3 comprises: shut-off valve 32 before and after flow control valve 31, variable valve, 33, by-pass valve 34 and corresponding connecting tube.The upstream and downstream of variable valve 31 arranges forward and backward shut-off valve 32,33 respectively, and the upstream of front shut-off valve 32 connects branch road and is provided with the downstream that bypath valve 34 is connected to rear shut-off valve 33.
The quantity of nozzle is that 7-9 props up.
The flow of single nozzle is 150kg/h.
The testing tool of described temperature point is thermocouple thermometer.
Along pyrolysis oven 6 top centrum and the uniform urea nozzle 7 of lower end, straight section cylindrical shell junction circumference, the spray gun axis of urea nozzle 7 and straight section Barrel alignment intersect vertically and horizontally disposed.
Above-mentioned urea pyrolysis ammonia system is utilized to carry out the method for urea pyrolysis ammonia, in pyrolysis oven 6, urea soln is decomposed into ammonia, carbon dioxide gas and water vapor by flue gas heating, flue gas after ammonia processed sends into Benitration reactor denitration, the thermal source of described urea soln pyrolysis is high-temperature flue gas, high-temperature flue gas takes from boiler, the inlet temperature of pyrolysis oven 6 controls at 500-650 DEG C, and control pyrolysis oven 6 temperature out and control at 400 DEG C-450 DEG C, the fume afterheat after ammonia processed sends boiler back to again.
The inlet temperature of pyrolysis oven 6 controls at 600 DEG C, and pyrolysis oven 6 temperature out controls at 400 DEG C.
Regulate temperature control equipment 3 to enter the cold blast rate of native system thus the inlet temperature of control pyrolysis oven 6 by pyrolysis oven temperature in measuring point 4, regulate high-temperature blower 2 to enter the exhaust gas volumn of native system thus the temperature out of control pyrolysis oven 6 by pyrolysis oven temperature out measuring point 5.
Described high-temperature blower 2 is high temperature frequency conversion fan, according to the change of coal firing boiler unit load to the input quantity of ammonia amount determination urea nozzle 7 required for denitration and the flow of single nozzle, and by the air quantity that the empty proportioning of certain ammonia regulates high temperature frequency conversion fan 2 to carry.
The concrete grammar regulating temperature control equipment 3 to enter the cold blast rate of native system by pyrolysis oven temperature in measuring point 4 is: when pyrolysis oven 6 temperature in is higher than 650 DEG C, open temp setting device 3, and progressively strengthen controlling opening of valve, add cold blast rate to fan outlet high-temperature flue gas; When pyrolysis oven 6 entrance flue gas temperature drops to 600 DEG C, adjustment doors aperture should be kept constant; When pyrolysis oven 6 entrance flue gas temperature continues to decline from 600 DEG C, (minimum temperature is 500 DEG C) should progressively reduce adjustment doors aperture until close completely.
The concrete grammar regulating high-temperature blower 2 to enter the exhaust gas volumn of native system by pyrolysis oven temperature out measuring point 5 is: for adapting to the demand of coal firing boiler unit load change to ammonia, when unit load reduces, required ammonia amount reduces, then spray into the urea soln also corresponding minimizing of pyrolysis oven 6, the high-temperature flue gas heat now entering pyrolysis oven 6 will higher than institute's heat requirement, pyrolysis oven 6 temperature out is caused progressively to raise, when pyrolysis oven 6 temperature out is higher than 450 DEG C, high temperature frequency conversion fan should be regulated, reduce the exhaust gas volumn entering pyrolysis oven 6, should stop when pyrolysis oven 6 exit gas temperature is reduced to 400 DEG C continuing to reduce high temperature frequency conversion fan flue gas operational throughput, otherwise should progressively strengthen blower fan operational throughput, ensure that pyrolysis oven 6 exit gas temperature regulates between 400-450 DEG C.
Temperature control equipment 3 comprises: stream flow control valve 31, shut-off valve 32 before and after variable valve, 33, by-pass valve 34 and corresponding connecting tube.The upstream and downstream of variable valve 31 arranges forward and backward shut-off valve 32,33 respectively, and the upstream of front shut-off valve 32 connects branch road and is provided with the downstream that bypath valve 34 is connected to rear shut-off valve 33.
This system extracts from boiler horizontal gas pass the high-temperature flue gas that temperature is 700-800 DEG C, sends in pyrolysis oven 6 after high-temperature dust removal, boosting.
When boiler load reduces, the flue-gas temperature of extraction declines, and now reduces the controlling opening of valve of temperature control equipment 3, and the cold blast rate entering system declines, and pyrolysis oven 6 entrance flue gas temperature is constant, otherwise then strengthens the valve opening of temperature control equipment 3.
Performance test Data Comparison table
| Pyrolysis oven inlet temperature DEG C | Pyrolysis oven temperature out DEG C | Ammonia output capacity % | Amount of energy saving kw |
| 450 | 350 | 60 | 428 |
| 500 | 370 | 80 | 550 |
| 550 | 385 | 93 | 609 |
| 600 | 400 | 98.5 | 623 |
| 650 | 415 | 97 | 578 |
| 700 | 430 | 95 | 529 |
| 750 | 450 | 90 | 474 |
As can be seen from the above table, pyrolysis oven 6 inlet temperature is at 550-700 DEG C, temperature out is at 385-430 DEG C, ammonia output capacity is all more than 93%, amount of energy saving is also higher simultaneously, and particularly when pyrolysis oven 6 inlet temperature is at 600 DEG C, temperature out ammonia output capacity 400 DEG C time is the highest, amount of energy saving is the highest, all has decline higher or lower than indices during this temperature.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the utility model discloses, must be contained by claim of the present utility model.
Claims (7)
1. a urea pyrolysis ammonia system, it is characterized in that: comprise the hot precipitator that the entrance be arranged on denitrification apparatus platform is communicated to high temperature flue-gas from boiler outlet, entrance is communicated to the temperature control equipment of cold wind source of the gas, pyrolysis oven, be arranged on the high-temperature blower between hot precipitator and pyrolysis oven, described thermostatic outlet is connected on the fume pipe of high-temperature blower outlet by cold-air duct and makes cold wind and high-temperature flue gas mixing, mixed cold wind and high-temperature flue gas are connected to the entrance of pyrolysis oven by pipeline, the outlet of pyrolysis oven is connected to ammonia-spraying grid, the entrance and exit of described pyrolysis oven is respectively equipped with temperature point, described pyrolysis oven is provided with urea nozzle.
2. urea pyrolysis ammonia system according to claim 1, is characterized in that: described high-temperature blower is high temperature frequency conversion fan.
3. urea pyrolysis ammonia system according to claim 1, it is characterized in that: described temperature control equipment comprises: shut-off valve, by-pass valve and corresponding connecting tube before and after flow control valve, variable valve, the upstream and downstream of variable valve arranges forward and backward shut-off valve respectively, and the upstream of front shut-off valve connects branch road and is provided with the downstream that bypath valve is connected to rear shut-off valve.
4. urea pyrolysis ammonia system according to claim 1, is characterized in that: the quantity of described nozzle is that 7-9 props up.
5. urea pyrolysis ammonia system according to claim 3, is characterized in that: the flow of single nozzle is 150kg/h.
6. urea pyrolysis ammonia system according to claim 1, is characterized in that: the testing tool of described temperature point is thermocouple thermometer.
7. urea pyrolysis ammonia system according to claim 1, is characterized in that: along pyrolysis oven top centrum and the uniform urea nozzle of lower end, straight section cylindrical shell junction circumference, the spray gun axis of urea nozzle and straight section Barrel alignment intersect vertically and horizontally disposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420821783.5U CN204369580U (en) | 2014-12-19 | 2014-12-19 | A kind of urea pyrolysis ammonia system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420821783.5U CN204369580U (en) | 2014-12-19 | 2014-12-19 | A kind of urea pyrolysis ammonia system |
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| Publication Number | Publication Date |
|---|---|
| CN204369580U true CN204369580U (en) | 2015-06-03 |
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| CN201420821783.5U Expired - Fee Related CN204369580U (en) | 2014-12-19 | 2014-12-19 | A kind of urea pyrolysis ammonia system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106807193A (en) * | 2015-12-02 | 2017-06-09 | 昆山市三维换热器有限公司 | A kind of flue-gas denitration process system |
| CN107158935A (en) * | 2017-05-19 | 2017-09-15 | 中国神华能源股份有限公司 | SCR denitration is controlled to be pyrolyzed the method and device of furnace temperature |
| CN107739036A (en) * | 2017-09-18 | 2018-02-27 | 华电电力科学研究院 | A kind of dry type urea pyrolysis ammonia system and method |
| CN109999661A (en) * | 2019-04-22 | 2019-07-12 | 山西华仁通电力科技有限公司 | A kind of gas-turbine waste heat boiler denitrating system and its course of work |
| CN110975599A (en) * | 2019-10-30 | 2020-04-10 | 江苏天莱环保工程有限公司 | In-furnace denitration system and process |
-
2014
- 2014-12-19 CN CN201420821783.5U patent/CN204369580U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106807193A (en) * | 2015-12-02 | 2017-06-09 | 昆山市三维换热器有限公司 | A kind of flue-gas denitration process system |
| CN107158935A (en) * | 2017-05-19 | 2017-09-15 | 中国神华能源股份有限公司 | SCR denitration is controlled to be pyrolyzed the method and device of furnace temperature |
| CN107739036A (en) * | 2017-09-18 | 2018-02-27 | 华电电力科学研究院 | A kind of dry type urea pyrolysis ammonia system and method |
| CN109999661A (en) * | 2019-04-22 | 2019-07-12 | 山西华仁通电力科技有限公司 | A kind of gas-turbine waste heat boiler denitrating system and its course of work |
| CN110975599A (en) * | 2019-10-30 | 2020-04-10 | 江苏天莱环保工程有限公司 | In-furnace denitration system and process |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150603 Termination date: 20181219 |