CN102671517A - Device for performing urea pyrolysis by utilizing smoke thermal enthalpy - Google Patents
Device for performing urea pyrolysis by utilizing smoke thermal enthalpy Download PDFInfo
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- CN102671517A CN102671517A CN201110058985XA CN201110058985A CN102671517A CN 102671517 A CN102671517 A CN 102671517A CN 201110058985X A CN201110058985X A CN 201110058985XA CN 201110058985 A CN201110058985 A CN 201110058985A CN 102671517 A CN102671517 A CN 102671517A
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- ammonia
- smoke
- pyrolysis
- urea pyrolysis
- flue gas
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Abstract
The invention relates to a device for performing urea pyrolysis by utilizing smoke thermal enthalpy. The device for performing the urea pyrolysis by utilizing the smoke thermal enthalpy comprises a dust remover (2) and a fan (5). The side wall of the dust remover (2) is provided with a high-temperature smoke inlet (1), an ash discharging bucket I (3) is arranged at the bottom of the dust remover (2), the top of the dust remover (2) is connected with an air inlet of the fan (5) through a smoke pipeline (4), an air outlet pipeline of the fan (5) is connected into an ammonia preparing tower (6), an ash discharging bucket II (7) is arranged at the bottom of the ammonia preparing tower (6), a spray gun (9) is connected into the side wall of the lower portion of the ammonia preparing tower (6), and an ammonia-contained smoke outlet (8) is arranged on the side wall of the lower portion of the ammonia preparing tower (6) and under the spray gun (9). The device for performing the urea pyrolysis by utilizing the smoke thermal enthalpy has the advantages that the device uses high-temperature smoke to replace fuel in a pyrolysis device for combustion heat storage and electric furnace heat storage, does not need fuel or electric energy and other external heat sources, is safe in use and energy-saving and reduces the operation cost of denitration.
Description
Technical field
The present invention relates to a kind of urea pyrolysis ammonia-preparing device.This device is used for removing the nitrogen oxide of flue gases such as boiler, Industrial Stoves.Belong to field of environment protection.
Background technology
At present, denitrating flue gas adopts SNCR method (SNCR) or selective catalytic reduction (SCR), and widely used reducing agent has three kinds in liquefied ammonia, urea, ammoniacal liquor.Contrast this three kinds of reducing agents, urea uses the safest, applied widely.When in selective catalytic reduction, using urea to make reducing agent, need to adopt pyrolysis or hydrolysis ammonia-preparing device, the pyrolysis system of comparing ammonia and hydrolysis Ammonia Process, urea pyrolysis Ammonia Process uses extensively.Present pyrolysis Ammonia Process adopts the mode of fuel combustion intensification or electrothermal heating, and under 350 ~ 650 ℃ of conditions, the urea thermal decomposition makes ammonia, is used for denitration reaction.Fuel combustion intensification or the energy resource consumption of electrothermal heating pyrolysis system ammonia mode are big, and the pyrolysis oven temperature is wayward, also is prone to lead to a disaster.
Summary of the invention
The objective of the invention is to overcome above-mentioned deficiency, provide a kind of energy consumption little, pyrolysis oven Controllable Temperature and the safe and reliable flue gas heat content that utilizes carry out the device of urea pyrolysis.
The objective of the invention is to realize like this: a kind of device that utilizes the flue gas heat content to carry out the urea pyrolysis; Comprise deduster and blower fan; The deduster sidewall is provided with high-temperature flue gas entry, and the deduster bottom is provided with the ash-unloading hopper I, and the top links to each other with the air inlet of blower fan through flue; The air outlet pipeline of blower fan inserts system ammonia tower; System ammonia tower bottom is provided with the ash-unloading hopper II, and system ammonia tower lower sides has access to the spraying spray gun and contains the ammonia exhanst gas outlet with being provided with, and contains the ammonia exhanst gas outlet and place spraying spray gun below.
The present invention carries out pyrolysis with the high-temperature flue gas heat content to urea liquid, and urea liquid sprays into after atomizing in the system ammonia tower, and the flue gas mixing ammonia (containing ammonia less than 5%) after pyrolysis gets into Benitration reactor and carries out denitration.Flue gas mixing ammonia after the pyrolysis contains dirt and the original mixing composition of flue gas, because denitration does not require gaseous ammonia, flue gas mixing ammonia can satisfy the requirement of denitration on quality.
The invention has the beneficial effects as follows:
Apparatus of the present invention substitute fuel combustion accumulation of heat or electric furnace accumulation of heat in the pyrolysis plant with high-temperature flue gas, do not need external thermals source such as fuel or electric energy, and are safe in utilization, and energy savings has removed denitration operating cost low.
Description of drawings
Fig. 1 carries out the general structure sketch map of the device of urea pyrolysis for the present invention utilizes the flue gas heat content.
Reference numeral among the figure:
High-temperature flue gas entry 1, deduster 2, ash-unloading hopper I 3, flue 4, blower fan 5, system ammonia tower 6, ash-unloading hopper II 7, contain ammonia exhanst gas outlet 8, spraying spray gun 9.
The specific embodiment
Referring to Fig. 1, Fig. 1 carries out the general structure sketch map of the device of urea pyrolysis for the present invention utilizes the flue gas heat content.Can find out that by Fig. 1 the device that the present invention utilizes the flue gas heat content to carry out the urea pyrolysis comprises deduster 2 and blower fan 5; Deduster 2 sidewalls are provided with high-temperature flue gas entry 1; High-temperature flue gas entry 1 joins with boiler or kiln, and deduster 2 bottoms are provided with ash-unloading hopper I 3, and the top links to each other with the air inlet of blower fan 5 through flue 4; The air outlet pipeline of blower fan 5 inserts system ammonia tower 6; System ammonia tower 6 bottoms are provided with ash-unloading hopper II 7, and system ammonia tower 6 lower sides have access to spraying spray gun 9 and contain ammonia exhanst gas outlet 8 with being provided with, and contain ammonia exhanst gas outlet 8 and place spraying spray gun 9 belows.
High-temperature flue gas entry and boiler or kiln join; Boiler and Industrial Stoves burner hearth central temperature are more than 1000 ℃; Be reduced to discharging about 200 ℃ gradually through flue-gas temperature behind the heat transmission equipment; Extract flue gas (the former relatively flue gas of extraction amount seldom, about 0.1% ~ 3%) from the about 600 ℃ position of flue-gas temperature and get into the device of urea pyrolysis.Hot flue gas gets into this device back to be mixed with the urea droplets that produces through spraying, and urea droplets is through water evaporates, and thermal decomposition prepares the ammonia that denitration reaction needs.Ammonia and this part high-temperature flue gas mixture enter into Benitration reactor, accomplish denitration reaction.
Claims (1)
1. device that utilizes the flue gas heat content to carry out the urea pyrolysis; It is characterized in that said device comprises deduster (2) and blower fan (5); Deduster (2) sidewall is provided with high-temperature flue gas entry (1), and deduster (2) bottom is provided with ash-unloading hopper I (3), and the top links to each other with the air inlet of blower fan (5) through flue (4); The air outlet pipeline of blower fan (5) inserts system ammonia tower (6); System ammonia tower (6) bottom is provided with ash-unloading hopper II (7), and system ammonia tower (6) lower sides has access to spraying spray gun (9) and contains ammonia exhanst gas outlet (8) with being provided with, and contains ammonia exhanst gas outlet (8) and place below the spraying spray gun (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110058985XA CN102671517A (en) | 2011-03-12 | 2011-03-12 | Device for performing urea pyrolysis by utilizing smoke thermal enthalpy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110058985XA CN102671517A (en) | 2011-03-12 | 2011-03-12 | Device for performing urea pyrolysis by utilizing smoke thermal enthalpy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102671517A true CN102671517A (en) | 2012-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110058985XA Pending CN102671517A (en) | 2011-03-12 | 2011-03-12 | Device for performing urea pyrolysis by utilizing smoke thermal enthalpy |
Country Status (1)
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| CN (1) | CN102671517A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104906932A (en) * | 2015-05-18 | 2015-09-16 | 西安西热锅炉环保工程有限公司 | Pyrolysis device capable of heating denitration urea by introducing high-temperature flue gas |
| CN104998531A (en) * | 2015-06-24 | 2015-10-28 | 江苏羚羊水泥工程技术有限公司 | SNCR denitration system for cement kiln flue gas |
| CN107300190A (en) * | 2016-04-14 | 2017-10-27 | 昆山市三维换热器有限公司 | Denitration of boiler smoke process system |
| CN115432715A (en) * | 2022-07-18 | 2022-12-06 | 华能国际电力股份有限公司大连电厂 | Device for preparing ammonia by urea pyrolysis based on sintering flue gas concurrent heating |
-
2011
- 2011-03-12 CN CN201110058985XA patent/CN102671517A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104906932A (en) * | 2015-05-18 | 2015-09-16 | 西安西热锅炉环保工程有限公司 | Pyrolysis device capable of heating denitration urea by introducing high-temperature flue gas |
| CN104998531A (en) * | 2015-06-24 | 2015-10-28 | 江苏羚羊水泥工程技术有限公司 | SNCR denitration system for cement kiln flue gas |
| CN104998531B (en) * | 2015-06-24 | 2017-06-20 | 江苏羚羊水泥工程技术有限公司 | A kind of cement kiln flue gas SNCR denitration system |
| CN107300190A (en) * | 2016-04-14 | 2017-10-27 | 昆山市三维换热器有限公司 | Denitration of boiler smoke process system |
| CN115432715A (en) * | 2022-07-18 | 2022-12-06 | 华能国际电力股份有限公司大连电厂 | Device for preparing ammonia by urea pyrolysis based on sintering flue gas concurrent heating |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120919 |