CN103723743A - Reactor for urea pyrolysis to produce ammonia for flue gas denitration - Google Patents
Reactor for urea pyrolysis to produce ammonia for flue gas denitration Download PDFInfo
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- CN103723743A CN103723743A CN201310471559.8A CN201310471559A CN103723743A CN 103723743 A CN103723743 A CN 103723743A CN 201310471559 A CN201310471559 A CN 201310471559A CN 103723743 A CN103723743 A CN 103723743A
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Abstract
The invention discloses a reactor for urea pyrolysis to produce ammonia for flue gas denitration. The reactor comprises a reactor body, wherein a gas inlet for feeding air or flue gas is formed in the lower part of the reactor body, and a reaction product outlet is formed in the upper part of the reactor body; a plurality of solution inlets for feeding urea solutions into the reactor body are formed in one side surface of the reactor body; and multiple groups of heating resistance wire packages are arranged on the outer side of the reactor body from top to bottom, and each group of heating resistance wires are connected with a corresponding temperature control device. According to the reactor, the solution inlets for feeding the urea solutions are formed in the side surface of the reactor body, and meanwhile, the heating resistance wires for heating the reactor are installed on the outer side of the reactor body, so that urea can be pyrolyzed and converted in the reactor. Therefore, the reactor is low in cost, simple to control and free of secondary pollution.
Description
Technical field
The invention belongs to gas denitrifying technology field, be specifically related to a kind of reactor of the urea pyrolysis ammonia processed for denitrating flue gas.
Background technology
China has caused the generation of a large amount of oxynitride (NOx) take fire coal as main power generation mode, at present the selective catalytic reduction method of main method (SCR) and the selective non-catalytic reduction method (SNCR) of denitration in power plant.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.Current pyrolysis reactor equipment occupation space is large, is unfavorable for installing denitrating system additional in the transformation of existing Utility Boiler Technology, and adopts Sweet natural gas or diesel oil cost is high, it is complicated to control, easily produce secondary pollution.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, space hold is little, temperature control is accurately reliably for the reactor of the urea pyrolysis ammonia processed of denitrating flue gas, 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 solution adopted in the present invention is: comprise reactor body, reactor body is the right cylinder of being made by high temperature steel; The bottom of reactor body is provided with the gas inlet for passing into air or flue gas, and the top of reactor body is provided with reacting product outlet; 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 wrapped up by some groups of resistive heaters from top to bottom, and every group of resistive heater is connected with respectively corresponding temperature regulating device.
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 corresponding thereto, reactor body by temperature regulating device control temperature of reaction at 100～800 ℃; Three groups of resistive heaters are divided into three conversion zones by reactor body.
Described solution entrance is evenly arranged in the side of reactor body, and stretches in reactor body, and the end of solution entrance is provided with for solution being fractured into the atomizing nozzle that diameter is several microns to the tens microns small dropletss that do not wait.
Reaction cavity between gas inlet and the reacting product outlet of described reactor body is cylindric, and the cross section of reactor body is circular; The side of reactor body is along circumferentially evenly offering four solution entrances, makes to spray into and in reactor, form eddy flow along four direction through atomizing nozzle small droplets out.
Compared with prior art, the present invention has following beneficial effect:
The present invention offers the solution entrance for passing into urea soln in the side of reactor body, in reactor body outside, install for the resistive heater to reactor heating simultaneously, can make urea pyrolysis in reactor transform, therefore cost of the present invention is low, control simply, can not produce secondary pollution.
Further, the whole reactor heating zone of the present invention 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 present invention is by the decoration form of ingehious design atomizing nozzle, can realize the eddy flow effect of urea atomizing droplet in reactor, thereby strengthen the thermal exchange of itself and high temperature steel wall, extend its residence time in reactor, guaranteed thus the pyrolysis transformation efficiency of urea in finite length conversion zone, effectively reduced the needed conversion zone length of pyrolysis, and then reduced reactor requisite space.Meanwhile, sectional temperature-controlled by carrying out, guaranteed in reaction process that temperature is accurately and reliably.
Accompanying drawing explanation
Fig. 1 is front view of the present invention;
Fig. 2 is the sectional view of A-A direction of the present invention.
Wherein, 1 is reactor body; 2 is gas inlet; 3 is solution entrance; 4 is reacting product outlet; 5 is resistive heater; 6 is temperature regulating device; 7 is atomizing nozzle.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Referring to Fig. 1 and Fig. 2, the present invention includes the cylindrical reactor body 1 of being made by high temperature steel, the bottom of reactor body 1 is provided with the gas inlet 2 for passing into air or flue gas, and the top of reactor body 1 is provided with reacting product outlet 4; Reaction cavity between gas inlet 2 and the reacting product outlet 4 of reactor body 1 is cylindric, and the cross section of reactor body 1 is circular; The side of reactor body 1 is along circumferentially evenly offering four solution entrances 3, and stretch in reactor body 1, the end of solution entrance 3 is provided with for solution being fractured into the atomizing nozzle 7 that diameter is several microns to the tens microns small dropletss that do not wait, through small droplets out of atomizing nozzle 7, along four direction, spray into and in reactor, form eddy flow, four solution entrances 3 are all less than 90 ° with the angle that reacts cavity, and four solution entrances 3 are consistent with the angle direction of reaction cavity; 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 6 corresponding thereto, reactor body 1 is controlled temperature of reaction at 100～800 ℃ by temperature regulating device 6, 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 invention:
First set the required working temperature of each heating zone, by resistance wire energising heating high temperature steel, after temperature-stable, from reactor 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 (4)
1. for a reactor for the urea pyrolysis ammonia processed of denitrating flue gas, it is characterized in that: comprise reactor body (1), the right cylinder of reactor body (1) for being made by high temperature steel; The bottom of reactor body (1) is provided with the gas inlet (2) for passing into air or flue gas, and the top of reactor body (1) is provided with reacting product outlet (4); 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 from top to bottom by some groups of resistive heaters (5) parcel, and every group of resistive heater (5) is connected with respectively corresponding temperature regulating device (6).
2. the reactor of the urea pyrolysis ammonia processed for denitrating flue gas according to claim 1, 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 (6) corresponding thereto, and reactor body (1) is controlled temperature of reaction at 100～800 ℃ by temperature regulating device (6); Three groups of resistive heaters (5) are divided into three conversion zones by reactor body (1).
3. the reactor of the urea pyrolysis ammonia processed for denitrating flue gas according to claim 1, it is characterized in that: described solution entrance (3) is evenly arranged in the side of reactor body (1), and stretch in reactor body (1), the end of solution entrance (3) is provided with for solution being fractured into the atomizing nozzle (7) that diameter is several microns to the tens microns small dropletss that do not wait.
4. the reactor of the urea pyrolysis ammonia processed for denitrating flue gas according to claim 1, it is characterized in that: the reaction cavity between gas inlet (2) and the reacting product outlet (4) of described reactor body (1) is cylindric, and the cross section of reactor body (1) is circular; The side of reactor body (1) is along circumferentially evenly offering four solution entrances (3), makes to spray into and in reactor, form eddy flow along four direction through atomizing nozzle (7) small droplets out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310471559.8A CN103723743A (en) | 2013-10-10 | 2013-10-10 | Reactor for urea pyrolysis to produce ammonia for flue gas denitration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310471559.8A CN103723743A (en) | 2013-10-10 | 2013-10-10 | Reactor for urea pyrolysis to produce ammonia for flue gas denitration |
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| CN103723743A true CN103723743A (en) | 2014-04-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949148A (en) * | 2014-05-20 | 2014-07-30 | 国家电网公司 | Enhanced absorption device in wet desulfurization absorption tower and wet desulfurization absorption tower |
| CN104386708A (en) * | 2014-10-21 | 2015-03-04 | 西安交通大学 | Urea hydrolyzing ammonia production system and process applied to denitration in thermal power plant |
| CN110368885A (en) * | 2019-07-23 | 2019-10-25 | 中国农业大学 | A kind of device and method of biomass continuous hydrothermal liquefaction preparation bio-crude oil |
| CN112808174A (en) * | 2021-02-06 | 2021-05-18 | 福建德尔科技有限公司 | Carbon tetrafluoride pyrolysis device and control method thereof |
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| CN101797469A (en) * | 2010-03-18 | 2010-08-11 | 南京耦联科技有限公司 | Urea pyrolysis reactor for flue gas denitrification |
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2013
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| DE102006059546A1 (en) * | 2006-12-16 | 2008-06-19 | Pierburg Gmbh | Device for thermal decomposition of dry urea to ammonia and thermolysis product, comprises a thermolysis reactor having a heating unit and air gap isolation, and feeding device having fluid exhausting device and conveying line |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949148A (en) * | 2014-05-20 | 2014-07-30 | 国家电网公司 | Enhanced absorption device in wet desulfurization absorption tower and wet desulfurization absorption tower |
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| CN104386708A (en) * | 2014-10-21 | 2015-03-04 | 西安交通大学 | Urea hydrolyzing ammonia production system and process applied to denitration in thermal power plant |
| CN104386708B (en) * | 2014-10-21 | 2016-08-03 | 西安交通大学 | A kind of urea hydrolysis ammonia producing system being applied to thermal power plant's denitration and technique |
| CN110368885A (en) * | 2019-07-23 | 2019-10-25 | 中国农业大学 | A kind of device and method of biomass continuous hydrothermal liquefaction preparation bio-crude oil |
| CN112808174A (en) * | 2021-02-06 | 2021-05-18 | 福建德尔科技有限公司 | Carbon tetrafluoride pyrolysis device and control method thereof |
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Application publication date: 20140416 |