CN207451632U - A kind of dry type urea pyrolysis ammonia system - Google Patents
A kind of dry type urea pyrolysis ammonia system Download PDFInfo
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- CN207451632U CN207451632U CN201721191300.8U CN201721191300U CN207451632U CN 207451632 U CN207451632 U CN 207451632U CN 201721191300 U CN201721191300 U CN 201721191300U CN 207451632 U CN207451632 U CN 207451632U
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Abstract
The utility model is related to a kind of dry type urea pyrolysis ammonia systems, it is characterised in that：Including injector, electric heater, give powder mouth, pyrolysis oven, distributor, roots blower, measure batcher, urea warehouse and fluidized air blower, the outlet of injector is connected with the entrance of electric heater, the outlet of electric heater is connected with the bottom of pyrolysis oven, the outlet of fluidized air blower is connected with the bottom of urea warehouse, the outlet of urea warehouse is connected with metering batcher, it measures after the feed opening of batcher merges with the outlet of roots blower and is connected with the entrance of distributor, the outlet of distributor is connected with to the entrance of powder mouth, it is arranged in the outlet of powder mouth in pyrolysis oven.The utility model substitutes urea liquid using urea powder, and system simplifies, and investment reduces, and avoids corrosion of piping and crystallization；High-temperature gas is pressurized using high temperature and high pressure steam injection, it is not only energy saving but also reliable, while can realize the uniform mixing of vapor and gas, so as to ensure the conversion ratio of urea pyrolysis.
Description
Technical field
The utility model belongs to industrial waste gas processing environmental protection and energy field, more particularly to a kind of dry type urea pyrolysis ammonia
System.
Background technology
With the increasingly strict of requirement of keeping the safety in production, urea is due to the spy of its shipping storage safe ready and environmental sound
Point, it has also become the reliable substitute of thermal power plant SCR denitrating flue gas reducing agent liquefied ammonia.Using urea as reducing agent, it need to first make urine
Element is heated to be decomposed into NH3And CO2.Urea ammonia has two kinds of techniques of pyrolysis and hydrolysis, wherein being pyrolyzed since O＆M quantities is small, throws
The characteristics of providing low and non-secondary pollution is using more.Urea pyrolysis chemical equation is CO (NH2)2+H2O→2NH3+CO2, i.e.,
1mol urea and 1mol water reaction generation 2mol ammonia and 1mol carbon dioxide, reaction process heat absorption.Traditional pyrolytic reaction is will
Urea granules are configured to urea liquid, with the high-temperature gas from electric heater in mixing of the pyrolysis reaction in furnace generation containing ammonia
Gas.Since urea liquid easily crystallizes and has the characteristics that corrosive, the urea solution mass concentration generally configured is relatively low, this certainly will
Moisture is caused to supply excessive, electric heater power consumption to rise.
In the prior art, CN103950953A discloses a kind of device and method of denitrating flue gas with urea pyrolysis ammonia,
Pyrolysis ammonia processed is carried out using dry type urea and water droplets, but water droplets enter pyrolysis oven and can increase system energy consumption and realize mist
Change that being sufficiently mixed for water droplet and urea is extremely difficult, and conversion rate of urea is unstable.
CN101870480A discloses a kind of device of preparing ammonia gas from urea solid by dry pyrolysis, passes through urea granules and high temperature cigarette
Solid/liquid/gas reactions generate gaseous mixture containing ammonia, wherein high-temperature flue gas by high-temperature blower supercharging driving, but high-temperature blower cost height, the service life compared with
It is short, reliability is not high.
Utility model content
The purpose of the utility model is to overcome above-mentioned deficiency in the prior art, and a kind of structure design is provided and is closed
The dry type urea pyrolysis ammonia system of reason.
The technical scheme in the invention for solving the above technical problem is：A kind of dry type urea pyrolysis ammonia system,
It is characterized in that：It is stored up including injector, electric heater, to powder mouth, pyrolysis oven, distributor, roots blower, metering batcher, urea
Storehouse and fluidized air blower, the outlet of injector are connected with the entrance of electric heater, the outlet of electric heater and the bottom phase of pyrolysis oven
Connection, the outlet of fluidized air blower are connected with the bottom of urea warehouse, and the outlet of urea warehouse is connected with metering batcher, measures
The feed opening of batcher is connected after merging with the outlet of roots blower with the entrance of distributor, and the outlet of distributor is with giving powder mouth
Entrance be connected, be arranged in the outlet of powder mouth in pyrolysis oven.
The entrance of injector described in the utility model is connected respectively with high temperature and high pressure steam pipeline and hot-gas channel.
The outlet of pyrolysis oven described in the utility model is connected with the ammonia-spraying grid of SCR equipment for denitrifying flue gas.
A kind of dry type urea pyrolysis ammonia method, it is characterised in that：Include the following steps：The height drawn from boiler air preheater
Wet body mixes to be pressurized to be formed after mixed gas by injector under the injection of steam is delivered to electric heater, mixed gas warp
Enter pyrolysis oven from the bottom of pyrolysis oven after electric heater heating；
The uniform blanking under the hot air fluidized effect of fluidized air blower of urea powder in urea warehouse to batcher is measured, is urinated
Plain powder, from the feed opening of metering batcher to the outlet of roots blower, will be urinated after metering batcher is weighed using roots blower
Plain powder blows to distributor, the allocated device of urea powder divide equally after by the way that powder mouth is given to enter pyrolysis oven.
The utility model urea powder passes through ammonia-spraying grid in pyrolysis oven with the mixed gas of the bottom from pyrolysis oven
It is mixed into SCR reactors.
The mesh number of urea powder is 100-400 mesh in urea warehouse described in the utility model.
Injector described in the utility model is situated between using the steam of high temperature and pressure as injection medium using high-temperature gas as by injection
Matter, mass ratio of induced-to-inducing air 12-30, the outlet pressure of injector is 7-12kPa, and high temperature and high pressure steam pipeline is passed through the steaming of high temperature and pressure
Vapour, hot-gas channel are passed through high-temperature gas.
The temperature of steam described in the utility model is 150-450 DEG C, pressure 0.3-2.0MPa.
High-temperature gas described in the utility model is no sulphur, low dust and gas body, and the temperature of high-temperature gas is 300-550 DEG C, pressure
For 1-5kPa.
The outlet temperature of electric heater described in the utility model is 400-500 DEG C, and according to the outlet temperature tune of pyrolysis oven
Whole electric heater puts into operation a group number；It is dense containing ammonia in the gas that urea powder and the mixed gas reaction of the bottom from pyrolysis oven generate
Degree is less than 5%.
The utility model substitutes urea liquid compared with prior art, using urea powder, and system simplifies, and investment reduces, and keeps away
Exempt from corrosion of piping and crystallization；Using high-temperature steam and high-temperature gas as heat source, reduce the power consumption of electric heater, reduce operation into
This；Supercharging is carried out to high-temperature gas using high steam and substitutes high-temperature blower supercharging, it is not only energy saving but also reliable, while can realize that water steams
The uniform mixing of gas and gas, so as to ensure the conversion ratio of urea pyrolysis.
Description of the drawings
Fig. 1 is the main structure diagram of the utility model embodiment.
Specific embodiment
Below in conjunction with the accompanying drawings and pass through embodiment the utility model is described in further detail, following embodiment is pair
The explanation of the utility model and the utility model is not limited to following embodiment.
Embodiment.
Referring to Fig. 1.
The present embodiment is a kind of dry type urea pyrolysis ammonia system, including injector 1, electric heater 2, to powder mouth 3, pyrolysis
Stove 4, distributor 5, roots blower 6, metering batcher 7, urea warehouse 8 and fluidized air blower 9.
The entrance of injector 1 is connected respectively with high temperature and high pressure steam pipeline and hot-gas channel, the outlet of injector 1
It is connected with the entrance of electric heater 2, the outlet of electric heater 2 is connected with the bottom of pyrolysis oven 4.
The outlet of fluidized air blower 9 is connected with the bottom of urea warehouse 8, and the outlet of urea warehouse 8 is connected with metering batcher 7
It is logical, it measures after the feed opening of batcher 7 merges with the outlet of roots blower 6 and is connected with the entrance of distributor 5, distributor 5
Outlet is connected with to the entrance of powder mouth 3, is arranged in the outlet of powder mouth 3 in pyrolysis oven 4, outlet and the SCR flue gases of pyrolysis oven 4
The ammonia-spraying grid 10 of denitrification apparatus（AIG）It is connected.
Quantity to powder mouth 3 is multiple, and all outlets to powder mouth 3 are evenly arranged in pyrolysis oven 4.
The present embodiment additionally provides dry type urea pyrolysis ammonia method, includes the following steps.
The high-temperature gas drawn from boiler air preheater mixes supercharging under the injection of steam by injector 1 and forms gaseous mixture
Electric heater 2 is delivered to after body, mixed gas enters pyrolysis oven 4 after the heating of electric heater 2 from the bottom of pyrolysis oven 4.
Preferably, injector 1 is using the steam of high temperature and pressure as injection medium, using high-temperature gas as by injection medium, draw
Coefficient is penetrated as 12-30, the outlet pressure of injector 1 is 7-12kPa, and high temperature and high pressure steam pipeline is passed through the steam of high temperature and pressure,
Hot-gas channel is passed through high-temperature gas.
Preferably, the temperature of steam is 150-450 DEG C, pressure 0.3-2.0MPa.
Preferably, the temperature of the present embodiment steam is 350 DEG C, pressure 0.6MPa.
Preferably, high-temperature gas is no sulphur, low dust and gas body, the temperature of high-temperature gas is 300-550 DEG C, pressure 1-
5kPa。
Preferably, the present embodiment high-temperature gas is 330 DEG C of temperature, the hot Secondary Air of pressure 2kPa.
Preferably, the outlet temperature of electric heater 2 is 400-500 DEG C, and electricity is adjusted according to the outlet temperature of pyrolysis oven 4
Heater 2 puts into operation a group number.
Preferably, the rated power of electric heater 2 is 170kW.
Urea powder containing ammonia density in the gas of the mixed gas reaction generation from the bottom of pyrolysis oven 4 with being less than 5%.
Urea powder in urea warehouse 8 under the high-pressure hot wind fluidization of fluidized air blower 9 uniform blanking to measure to
Material machine 7, urea powder, from the feed opening of metering batcher 7 to the outlet of roots blower 6, utilize after metering batcher 7 is weighed
Urea powder is blowed to distributor 5 by roots blower 6, the allocated device 5 of urea powder divide equally after by the way that powder mouth 3 is given to enter pyrolysis oven 4.
Preferably, the mesh number of urea powder is 100-400 mesh in urea warehouse 8.
Urea powder is in pyrolysis oven 4 with passing through ammonia-spraying grid 10 after the mixed gas reaction from the bottom of pyrolysis oven 4
（AIG）Into SCR reactors.
Preferably, the mixed gas reaction of urea powder and high-temperature gas/steam from the bottom of pyrolysis oven 4 generates
Ammonia flow be 80kg/h gaseous mixture, gaseous mixture by ammonia-spraying grid 10 enter SCR reactors, conversion rate of urea reach 98% with
On.
The present embodiment is pressurized using the steam ejection high-temperature gas of high temperature and pressure, then heated rear into pyrolysis oven 4, with adopting
With pneumatic conveying mode the urea powder to pyrolysis oven 4 is sent to react, generated containing gaseous mixture of the ammonia density less than 5%.This method uses
Steam power is pressurized high-temperature gas, reduces heating power while substituting high-temperature blower, and strengthening system reliability reduces
Operating cost realizes the uniform mixing of vapor and high-temperature gas, ensures urea pyrolysis conversion ratio.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of parts and components is named
Title etc. can be different, and the above content described in this specification is only to the utility model structure example explanation.
The equivalence changes or simple change that all construction, feature and principles according to described in the utility model patent concept are done, are wrapped
It includes in the protection domain of the utility model patent.Those skilled in the art of the present invention can be to described
Specific embodiment does various modifications or additions or substitutes in a similar way, without departing from the knot of the utility model
Structure surmounts scope defined in the claims, all should belong to the protection range of the utility model.
Claims (3)
1. a kind of dry type urea pyrolysis ammonia system, it is characterised in that：Including injector, electric heater, to powder mouth, pyrolysis oven,
Distributor, roots blower, metering batcher, urea warehouse and fluidized air blower, the outlet of injector and the entrance phase of electric heater
Even, the outlet of electric heater is connected with the bottom of pyrolysis oven, and the outlet of fluidized air blower is connected with the bottom of urea warehouse, urea
The outlet of warehouse with metering batcher be connected, measure after the feed opening of batcher merges with the outlet of roots blower with distributor
Entrance be connected, the outlet of distributor is connected with to the entrance of powder mouth, is arranged in the outlet of powder mouth in pyrolysis oven.
2. dry type urea pyrolysis ammonia system according to claim 1, it is characterised in that：The entrance difference of the injector
It is connected with high temperature and high pressure steam pipeline and hot-gas channel.
3. dry type urea pyrolysis ammonia system according to claim 1, it is characterised in that：The outlet of the pyrolysis oven with
The ammonia-spraying grid of SCR equipment for denitrifying flue gas is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721191300.8U CN207451632U (en) | 2017-09-18 | 2017-09-18 | A kind of dry type urea pyrolysis ammonia system |
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| CN201721191300.8U CN207451632U (en) | 2017-09-18 | 2017-09-18 | A kind of dry type urea pyrolysis ammonia system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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