CN203807186U - Fluidized bed reactor of pyrolyzing urea to prepare ammonia - Google Patents
Fluidized bed reactor of pyrolyzing urea to prepare ammonia Download PDFInfo
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- CN203807186U CN203807186U CN201420194712.7U CN201420194712U CN203807186U CN 203807186 U CN203807186 U CN 203807186U CN 201420194712 U CN201420194712 U CN 201420194712U CN 203807186 U CN203807186 U CN 203807186U
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- reactor
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- urea
- fluidized
- urea pyrolysis
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Abstract
The utility model discloses a fluidized bed reactor of pyrolyzing urea to prepare ammonia. The reactor comprises a reactor body, wherein a gas inlet for introducing air or smoke is formed on the lower part of the reactor body, a reaction product outlet is formed on the upper part of the reaction body, a plurality of solution inlets for introducing an urea solution to the reactor body are formed on the side face of the reactor body, a plurality groups of heating electric wires from top to bottom are arranged outside the reactor body, and each group of heating electric wire is respectively connected with a corresponding temperature control device. The solution inlets for introducing the urea solution to the reactor body are formed on the side face of the reactor body, and meanwhile the heating electric wires for heating the reactor are installed outside the reactor body, so that urea can be pyrolyzed to be converted in the reactor. Therefore, the reactor is low in cost, simple to control and free from secondary pollution.
Description
Technical field
The utility model belongs to denitrating flue gas field, thereby relate to, urea soln pyrolysis is produced to denitrification reducing agent---the reactor of ammonia, is specifically related to the fluidized-bed reactor of a kind of urea pyrolysis ammonia processed.
Background technology
China take fire coal and is that main power generation mode has caused a large amount of oxynitride (NO
x) generation, at present in power plant, the Main Means of denitration is selective catalytic reduction (SCR) and selective non-catalytic reduction method (SNCR).In denitrification process, widely used reductive agent ammonia (NH
3) be mainly derived from liquefied ammonia, ammoniacal liquor and urea.Wherein, liquefied ammonia and ammoniacal liquor belong to hazardous chemical, once leak, may cause the dangerous generation such as burning and blast, therefore aspect transportation, storage, are having strict regulation and requirement, and ease of use is restricted.Than liquefied ammonia and ammoniacal liquor, that urea has advantages of is nontoxic, be easy to transportation and store.
For the method for producing ammonia by urea, mainly contain two kinds of pyrolysis method and hydrolysis method.Wherein hydrolysis method need operate under High Temperature High Pressure, and cost compared with high, water consumption is large, the time of response is long, is not suitable for widespread use in boiler of power plant.Pyrolysis method is sent the air of preheating or hot flue gas or Sweet natural gas or diesel oil into pyrolysis chamber conventionally, the urea soln of finite concentration (40%～50%) is sprayed into pyrolysis chamber simultaneously, thereby there is redox reaction, produces ammonia.Under the reaction conditions of catalyst-free, urea pyrolysis needs comparatively high temps (800 ℃～1000 ℃) completely, can cause thus huge cost loss, is unfavorable for the realization of target for energy-saving and emission-reduction.And generally, under the katalysis of metal oxide, the temperature of the complete pyrolysis of urea can be reduced to 200 ℃ of left and right, significantly reduced the required energy consumption of pyrolysis.The at present domestic pyrolysis reactor generally adopting is not but considered utilization and the recovery problem of catalyzer, more cannot realize the well blend of catalyzer and urea, is unfavorable for carrying out smoothly and effectively utilizing of urea pyrolysis reaction.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, reaction yield is high, the accurate reliably fluidized-bed reactor of urea pyrolysis ammonia processed of temperature control, thereby this reactor can produce denitrification reducing agent---ammonia by urea soln pyrolysis, cost is low, control simply, can not produce secondary pollution.
In order to achieve the above object, the technical scheme that the utility model adopts is:
Comprise reactor body, the bottom of reactor body is provided with for passing into the gas inlet of air or flue gas, and the top of reactor body is provided with reacting product outlet, and gas inlet is connected with reacting product outlet, forms reaction cavity; The side opening of reactor body is provided with some for pass into the solution entrance of urea soln in reactor body; The outside of reactor body is enclosed with some groups of resistive heaters from top to bottom.
Every group of resistive heater is connected with respectively temperature regulating device.
Described reactor body is the right cylinder that high temperature steel is made.
Described reactor body is wrapped up by three groups of resistive heaters from top to bottom, and three groups of resistive heaters are all connected with temperature regulating device, and three groups of resistive heaters are divided into three conversion zones by reactor body.
Described solution entrance circumferential arrangement is in the side of reactor body, and stretches in reactor body, is connected with reaction cavity, and the end of solution entrance is provided with for by the atomizing nozzle of solution fragmentation.
The side symmetric position of described reactor body offers two solution entrances.
Described reaction cavity is cylindric, and the cross section of reactor body is circular.
In described reaction cavity, be provided with for placing the quartzy sieve plate of catalyzer, in reaction process, under the effect of incoming flow gas, catalyzer presents fluidized state, fully mixes with reactant the generation contacting with catalyse pyrolysis reaction.
Compared with prior art, the utlity model has following beneficial effect:
The utility model provides the fluidized-bed reactor of a kind of urea pyrolysis ammonia processed, owing to offering in the side of reactor body for passing into the solution entrance of urea soln, in reactor body outside, install for the resistive heater to reactor heating simultaneously, make reactor form pyrolysis chamber, can make urea in reactor, carry out pyrolysis conversion, there is redox reaction and produce ammonia, therefore installation cost of the present utility model is low, and control simple, in addition, owing to adopting urea soln to react as raw material, therefore, can not produce secondary pollution.
Further, the whole reactor heating zone of the utility model is divided into three groups, consists of respectively, and can increase and decrease according to the needs of practical situation resistive heater and temperature regulating device, sectional temperature-controlled by carrying out, and has guaranteed in reaction process that temperature accurately and reliably.Zone heating can better improve the accuracy of temperature in conversion zone, also can better adapt to the different operating modes that the different carriers such as air or flue gas cause, and saves heating electric energy, meets the policy requirements of energy-conserving and environment-protective.
Further, the utility model is by the decoration form of ingehious design atomizing nozzle, can strengthen the atomizing effect of urea atomizing droplet in reactor, promote its thermal exchange and momentum exchange in reactor, guaranteed thus the pyrolysis transformation efficiency of urea in finite length conversion zone, effectively reduce the needed conversion zone length of pyrolysis, and then reduced reactor requisite space.
Further, powder catalyst is fluidized under the effect of incoming flow gas, having strengthened catalyzer contacts with the mixing between reactant, be of value to and give full play to the katalysis of catalyzer in pyrolytic process, guaranteed to obtain desirable urea decomposition rate and ammonia productive rate within the limited residence time.Meanwhile, sectional temperature-controlled by carrying out, guaranteed that the temperature control in each stages such as preheating of air in whole pyrolytic process, solution evaporation, reaction generation is accurate, effectively saved the power consumption of reacting required.
Accompanying drawing explanation
Fig. 1 is front view of the present utility model;
Fig. 2 is the sectional view of the utility model A-A direction.
Wherein, 1 is reactor body; 2 is gas inlet; 3 is solution entrance; 4 is reacting product outlet; 5 is resistive heater; 6 is fluidized catalyst; 7 is quartzy sieve plate; 8 is temperature regulating device; 9 is atomizing nozzle.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail
Referring to Fig. 1 and Fig. 2, the utility model comprises the cylindrical reactor body 1 of being made by high temperature steel, the bottom of reactor body 1 is provided with for passing into the gas inlet 2 of air or flue gas, the top of reactor body 1 is provided with reacting product outlet 4, and gas inlet 2 is connected with reacting product outlet 4, form reaction cavity; Gas inlet 2 and the reaction cavity between reacting product outlet 4 of reactor body 1 are cylindric, and the cross section of reactor body 1 is circular; The side opening of reactor body 1 is provided with some for pass into the solution entrance 3 of urea soln in reactor body 1; The outside of reactor body 1 is enclosed with some groups of resistive heaters 5 from top to bottom.Exemplary, the side of reactor body 1 is along circumferentially evenly offering two solution entrances 3, and stretch in reaction cavity, the end of solution entrance 3 is provided with for solution being fractured into the atomizing nozzle 9 that diameter is several microns to the tens microns small dropletss that do not wait, and through atomizing nozzle 9 small droplets out, with the form of liquidating, sprays in reactor further broken; The interior specific position of reactor body 1 is laid quartzy sieve plate 7, and on quartzy sieve plate 7, the required powder catalyst 6 of placing response, carries out in process in reaction, and catalyzer 6 is fluidized and reacts in order to catalyse pyrolysis under gas effect; Reactor body 1 is from top to bottom by three groups of resistive heaters, 5 parcels, three groups of resistive heaters 5 are all connected with temperature regulating device 8 corresponding thereto, reactor body 1 is controlled temperature of reaction at 100～1000 ℃ by temperature regulating device 8, to adapt to differential responses section temperature control demand, improve temperature control accuracy, during concrete enforcement, can increase and decrease as required the quantity of temperature regulating device and resistance wire; Three groups of resistive heaters 5 are divided into three conversion zones by reactor body 1.
Working process of the present utility model:
First proper catalyst 6 is positioned on quartzy sieve plate 7, then set the required working temperature of each heating zone, by resistance wire 5 energising heating high temperature steel, after temperature-stable, from the gas inlet 2 of reactor body 1 below, pass into air or flue gas, from urea soln entrance, pass into the urea soln of suitable concentration, in reactor, react as follows CO (NH
2)
2→ NH
3+ HNCO, HNCO+H
2o → NH
3+ CO
2thereby, can generate a large amount of ammonias and carbonic acid gas.Mixed gas passes in boiler flue via the outlet of reactor top, to carry out denitration reaction.
Claims (8)
1. the fluidized-bed reactor of a urea pyrolysis ammonia processed, it is characterized in that: comprise reactor body (1), the bottom of reactor body (1) is provided with the gas inlet (2) for passing into air or flue gas, the top of reactor body (1) is provided with reacting product outlet (4), and gas inlet (2) are connected with reacting product outlet (4), form reaction cavity; The side opening of reactor body (1) is provided with some for pass into the solution entrance (3) of urea soln in reactor body (1); The outside of reactor body (1) is enclosed with some groups of resistive heaters (5) from top to bottom.
2. the reactor of the urea pyrolysis ammonia processed for denitrating flue gas according to claim 1, is characterized in that: every group of resistive heater (5) is connected with respectively temperature regulating device (8).
3. the reactor of the urea pyrolysis ammonia processed for denitrating flue gas according to claim 1, is characterized in that: the right cylinder that described reactor body (1) is made for high temperature steel.
4. according to the fluidized-bed reactor of the urea pyrolysis ammonia processed described in claim 1 or 3, it is characterized in that: described reactor body (1) is wrapped up by three groups of resistive heaters (5) from top to bottom, three groups of resistive heaters (5) are all connected with temperature regulating device (8), and three groups of resistive heaters (5) are divided into three conversion zones by reactor body (1).
5. according to the fluidized-bed reactor of the urea pyrolysis ammonia processed described in claim 1 or 3, it is characterized in that: described solution entrance (3) circumferential arrangement is in the side of reactor body (1), and stretch in reactor body (1), be connected with reaction cavity, the end of solution entrance (3) is provided with for by the atomizing nozzle of solution fragmentation (9).
6. the fluidized-bed reactor of urea pyrolysis according to claim 5 ammonia processed, is characterized in that: the side symmetric position of described reactor body (1) offers two solution entrances (3).
7. according to the fluidized-bed reactor of the urea pyrolysis ammonia processed described in claim 1 or 3, it is characterized in that: described reaction cavity is cylindric, the cross section of reactor body (1) is circular.
8. according to the fluidized-bed reactor of the urea pyrolysis ammonia processed described in claim 1 or 3, it is characterized in that: in described reaction cavity, be provided with for placing the quartzy sieve plate (7) of catalyzer (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420194712.7U CN203807186U (en) | 2014-04-18 | 2014-04-18 | Fluidized bed reactor of pyrolyzing urea to prepare ammonia |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420194712.7U CN203807186U (en) | 2014-04-18 | 2014-04-18 | Fluidized bed reactor of pyrolyzing urea to prepare ammonia |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203807186U true CN203807186U (en) | 2014-09-03 |
Family
ID=51445971
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420194712.7U Expired - Fee Related CN203807186U (en) | 2014-04-18 | 2014-04-18 | Fluidized bed reactor of pyrolyzing urea to prepare ammonia |
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| Country | Link |
|---|---|
| CN (1) | CN203807186U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103936029A (en) * | 2014-04-18 | 2014-07-23 | 西安交通大学 | Fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea |
-
2014
- 2014-04-18 CN CN201420194712.7U patent/CN203807186U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103936029A (en) * | 2014-04-18 | 2014-07-23 | 西安交通大学 | Fluidized bed reactor for preparing ammonia by virtue of pyrolysis of urea |
| CN103936029B (en) * | 2014-04-18 | 2016-08-17 | 西安交通大学 | A kind of fluidized-bed reactor of urea pyrolysis ammonia |
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Legal Events
| 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: 20140903 Termination date: 20180418 |