CN114984742B

CN114984742B - Flue gas denitration system

Info

Publication number: CN114984742B
Application number: CN202210941795.0A
Authority: CN
Inventors: 张新朝; 管立君; 赵玉会; 左国辉; 吴槟克
Original assignee: Hebei Hanyao Environmental Protection Technology Co ltd
Current assignee: Hebei Hanyao Carbon New Energy Technology Co ltd
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2022-11-08
Anticipated expiration: 2042-08-08
Also published as: CN114984742A

Abstract

The invention relates to the technical field of environment-friendly equipment, and provides a flue gas denitration system which comprises a combustion device, a flue gas conveying pipeline and a denitration device which are sequentially communicated, wherein a communication port at one end of the flue gas conveying pipeline, which is communicated with the combustion device, is a flue gas inlet, a communication port at the other end of the flue gas conveying pipeline, which is communicated with the denitration device, is a flue gas outlet, and the flue gas conveying pipeline comprises a mixing pipeline and is provided with a first mixing cavity; the first ammonia spraying assembly is arranged on the mixing pipeline and communicated with the first mixing cavity; the mixing duct includes: the first ammonia spraying assembly is positioned on the first pipeline; the sectional area of the first pipeline and the sectional area of the third pipeline are both larger than that of the second pipeline; the fourth pipeline has a plurality of, and the one end of a plurality of fourth pipeline all communicates with the second pipeline, and the other end of a plurality of fourth pipeline all communicates with the third pipeline. Through above-mentioned technical scheme, the problem of the waste of flue gas denitration in-process aqueous ammonia or denitration effect is not enough among the correlation technique has been solved.

Description

Flue gas denitration system

Technical Field

The invention relates to the technical field of environment-friendly equipment, in particular to a flue gas denitration system.

Background

The flue gas denitration means that oxynitride in flue gas generated in industrial production is removed, and the oxynitride is prevented from being discharged into the atmosphere to increase the concentration of atmospheric oxynitride, so that the atmosphere, soil and water resources are polluted. The principle of flue gas denitration is that nitrogen oxide is reduced into nitrogen by a reducing agent under the action of a catalyst, and the commonly used reducing agent is ammonia water.

In the flue gas denitration process, the important link that influences denitration efficiency is the mixed degree of flue gas and aqueous ammonia, common flue gas denitration equipment lets in flue gas conveying pipeline with flue gas and aqueous ammonia, mix with the flue gas after evaporating through the aqueous ammonia high temperature, carry the gas after mixing to denitration device in with the catalyst realization denitration after mixing, because the pipeline is through pipeline, and the flow velocity of flue gas is under the influence of the thermal expansion power of fan and combustion gas, buoyancy etc., fast, the time that the aqueous ammonia mixes with the flue gas is shorter after getting into the pipeline, hardly carry out abundant mixing with the flue gas, in order to let aqueous ammonia and flue gas carry out abundant integration, the method commonly used is to establish multistage ammonia injection subassembly in the pipeline, realize abundant mixing through the supply of increaseing the aqueous ammonia, this kind of mode leads to the utilization ratio of aqueous ammonia to reduce by a wide margin.

Therefore, a denitration system capable of uniformly mixing flue gas and ammonia water needs to be developed at the present stage, so that waste of ammonia water is avoided, and the situation that the denitration effect is insufficient is avoided.

Disclosure of Invention

The invention provides a flue gas denitration system, which solves the problems of ammonia water waste or insufficient denitration effect in a flue gas denitration process in the related technology.

The technical scheme of the invention is as follows:

a flue gas denitration system comprises a combustion device, a flue gas conveying pipeline and a denitration device which are sequentially communicated, wherein one end of the flue gas conveying pipeline is communicated with a communication port communicated with the combustion device to form a smoke inlet, the other end of the flue gas conveying pipeline is communicated with the denitration device to form a smoke outlet, and the flue gas conveying pipeline comprises a combustion device, a flue gas conveying pipeline and a denitration device which are sequentially communicated with each other

A mixing tube having a first mixing cavity;

the first ammonia spraying assembly is arranged on the mixing pipeline, is communicated with the first mixing cavity and is used for spraying ammonia water along the flue gas conveying direction;

the mixing duct comprises

The first pipeline is provided with the first ammonia injection assembly;

the first pipeline, the second pipeline and the third pipeline are sequentially communicated, the first pipeline is communicated with the smoke inlet, the third pipeline is communicated with the smoke outlet, and the sectional area of the first pipeline and the sectional area of the third pipeline are larger than that of the second pipeline along the smoke conveying direction;

the fourth pipeline, the fourth pipeline has a plurality of, a plurality of the one end of fourth pipeline all with the second pipeline intercommunication, a plurality of the other end of fourth pipeline all with the third pipeline intercommunication, first pipeline the second pipeline third pipeline with the fourth pipeline constitutes first hybrid cavity jointly.

As a further technical solution, an α angle formed by the fourth pipeline and the second pipeline is an acute angle, and a β angle formed by the fourth pipeline and the third pipeline is an obtuse angle.

As a further technical scheme, the flue gas conveying pipeline also comprises

The second spouts the ammonia subassembly, the second spouts the ammonia subassembly setting and is in on the third pipeline, be located the third pipeline is terminal, with first hybrid cavity intercommunication has first control valve, first control valve is used for controlling the second spouts the injection time clearance of ammonia subassembly, the second spouts the ammonia subassembly and is used for following flue gas direction of delivery is opposite direction intermittent type sprays the aqueous ammonia.

As a further technical solution, the mixing pipeline comprises

A fifth conduit in communication with the third conduit;

the fifth pipeline is communicated with the sixth pipeline, the third pipeline is communicated with the smoke outlet through the fifth pipeline and the sixth pipeline, the fifth pipeline and the sixth pipeline form a second mixing cavity, and the smoke conveying pipeline further comprises a smoke conveying pipeline

The third ammonia spraying assembly is arranged on the fifth pipeline and communicated with the second mixing cavity, the third ammonia spraying assembly is provided with a second control valve, the second control valve is used for controlling the spraying time gap of the third ammonia spraying assembly, and the third ammonia spraying assembly is used for intermittently spraying ammonia water along the flue gas conveying direction.

As a further technical solution, the fifth pipeline comprises

A first end of the four-way pipe is communicated with the third pipe, and the third ammonia injection assembly is positioned at the first end;

one end of the annular pipeline is communicated with the second end of the four-way pipeline, the other end of the annular pipeline is communicated with the third end of the four-way pipeline, the fourth end of the four-way pipeline is communicated with the sixth pipeline, and the flue gas sequentially flows through the first end, the third end, the annular pipeline, the second end and the fourth end and then enters the sixth pipeline;

the fourth ammonia spraying assembly is arranged at a communication port of the annular pipeline and the second end and communicated with the second mixing cavity, the fourth ammonia spraying assembly is provided with a third control valve, the third control valve is used for controlling the spraying time gap of the fourth ammonia spraying assembly, and the fourth ammonia spraying assembly is used for intermittently spraying ammonia water along the flue gas conveying direction;

the rotating shafts are rotatably arranged on the four-way pipeline and correspondingly arranged at the communication areas of the first end, the second end, the third end and the fourth end;

the guide plate, the guide plate has a plurality of, sets up respectively in a plurality of in the pivot, the guide plate rotates the back, is used for making first end with the third end intercommunication, or makes the second end with the fourth end intercommunication.

As a further technical solution, the fifth pipeline comprises

A seventh conduit in communication with the third conduit, the third ammonia injection assembly being located on the seventh conduit;

one end of the annular pipeline is communicated with the seventh pipeline, and the other end of the annular pipeline is communicated with the sixth pipeline;

the fourth spouts the ammonia subassembly, the fourth spouts the ammonia subassembly setting and is in the ring conduit with sixth pipeline intercommunication mouth department, the fourth spouts the ammonia subassembly has the third control valve, the third control valve is used for controlling the injection time clearance of the fourth subassembly of spouting ammonia, the fourth subassembly of spouting ammonia is used for following flue gas direction of delivery intermittent type sprays the aqueous ammonia.

As a further technical scheme, the guide plate is divided into two areas by the rotating shaft, the first area is a force application area, the second area is provided with a plurality of through holes, and the second area is a driven area.

As a further technical proposal, the method also comprises

The first ammonia spraying assembly, the second ammonia spraying assembly, the third ammonia spraying assembly and the fourth ammonia spraying assembly are all communicated with the ammonia water tank;

the heat exchange pipeline is arranged in the ammonia water tank and provided with an inlet and an outlet, the inlet is communicated with the outlet, and the heat exchange pipeline is used for preheating ammonia water after being introduced into flue gas.

As a further technical solution, the first ammonia injection assembly, the second ammonia injection assembly, the third ammonia injection assembly and the fourth ammonia injection assembly all comprise

The ammonia spraying ring sleeve is provided with an ammonia water circulation cavity and a gas circulation cavity, the ammonia water circulation cavity is communicated with the ammonia water tank, and the gas circulation cavity is used for being communicated with the high-pressure gas source station;

the ammonia spraying pipelines are arranged on the ammonia spraying ring sleeve at intervals and are communicated with the ammonia water circulation cavity, a circulation gap is formed between every two adjacent ammonia spraying pipelines, and the circulation gap is used for the circulation of the smoke;

the ammonia water shower nozzle, the setting of ammonia water shower nozzle is in spout the ammonia ring and sheathe in, with ammonia water circulation cavity with the gas circulation cavity intercommunication for spray atomizing high pressure aqueous ammonia.

The working principle and the beneficial effects of the invention are as follows:

the invention relates to a flue gas denitration system, which is designed for solving the problems of waste of ammonia water or insufficient denitration effect in the flue gas denitration process in the related technology, and particularly relates to a flue gas denitration system, wherein flue gas enters a mixing pipeline in a flue gas conveying pipeline under the action of thermal expansion force and buoyancy force of a fan and combustion gas after being generated by combustion of raw materials in a combustion device and sequentially flows through a first pipeline, a second pipeline and a third pipeline, a first ammonia spraying assembly is arranged on the first pipeline and is used for continuously spraying atomized high-pressure ammonia water to the conveying direction of the flue gas, the atomized ammonia water can be evaporated into gas after being contacted with high-temperature flue gas in a flue and is mixed with the flue gas, the flow rate of the flue gas can be accelerated after the high-pressure ammonia water is sprayed, the mixing effect of the flue gas and the ammonia water is increased after the flow rate of the flue gas is increased, the mixing effect of the atomized ammonia water and the high-temperature flue gas is increased, the cross-sectional area of the first pipeline and the cross-sectional area of the third pipeline is set to be larger than that the cross-sectional area of the second pipeline is communicated with the third pipeline through a plurality of fourth pipelines to form a venturi tube, and the venturi tube, so that the flow rate of the flue gas and the flue gas in the flue gas is increased, and the flue gas flows back to the flue gas in the flue gas, and the flue gas can be returned to the flue gas.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a schematic view of a first hybrid cavity configuration of the present invention;

FIG. 3 is a schematic cross-sectional view of the present invention;

FIG. 4 is a schematic view of the operation of the third ammonia injection unit A of FIG. 3;

FIG. 5 is a schematic view of the operation of the second ammonia injection unit and the fourth ammonia injection unit in section A of FIG. 3;

FIG. 6 is a schematic view of the structure of the portion B in FIG. 4;

FIG. 7 is a schematic view of a seventh conduit configuration according to the present invention;

FIG. 8 is a schematic view of the flow gap and ammonia injection piping configuration of the present invention;

FIG. 9 is a schematic view of the structure of the portion C in FIG. 4;

in the figure: 1. the device comprises a combustion device, 2, a flue gas conveying pipeline, 3, a denitration device, 4, a smoke inlet, 5, a smoke outlet, 6, a mixing pipeline, 7, a first mixing cavity, 8, a first ammonia injection assembly, 9, a first pipeline, 10, a second pipeline, 11, a third pipeline, 12, a fourth pipeline, 13, a second ammonia injection assembly, 14, a first control valve, 15, a fifth pipeline, 16, a sixth pipeline, 17, a second mixing cavity, 18, a third ammonia injection assembly, 19, a second control valve, 20, a fourth pipeline, 21, a first end, 22, a ring pipeline, 23, a second end, 24, a third end, 25, a fourth end, 26, a fourth ammonia injection assembly, 27, a third control valve, 28, a rotating shaft, 29, a communication area, 30, a guide plate, 31, a seventh pipeline, 32, a force application area, 33, a through hole, 34, a driven area, 35, an ammonia water tank, 36, an ammonia water pipeline, 37, an inlet, 38, an outlet, 39, an ammonia injection cavity, a circulation cavity, 40, a circulation cavity, a gas circulation gap, 44, an ammonia water, a nozzle, a circulation gap, 43, ammonia water, a circulation gap 43, and a nozzle.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any inventive step, are intended to be within the scope of the present invention.

As shown in FIGS. 1 to 9, the present embodiment proposes

A flue gas denitration system, including burner 1, flue gas conveying line 2 and denitrification facility 3 that communicate in proper order, the intercommunication mouth of the one end of flue gas conveying line 2 and burner 1 intercommunication is for advancing mouth 4, and the intercommunication mouth of the other end of flue gas conveying line 2 and denitrification facility 3 intercommunication is outlet flue 5, and flue gas conveying line 2 includes

A mixing duct 6, the mixing duct 6 having a first mixing cavity 7;

the first ammonia spraying assembly 8 is arranged on the mixing pipeline 6, communicated with the first mixing cavity 7 and used for spraying ammonia water along the flue gas conveying direction;

the mixing duct 6 comprises

The first pipeline 9 is provided with the first ammonia injection assembly 8, and the first pipeline 9 is provided with the first ammonia injection assembly 8;

the smoke-removing device comprises a second pipeline 10 and a third pipeline 11, wherein the first pipeline 9, the second pipeline 10 and the third pipeline 11 are sequentially communicated, the first pipeline 9 is communicated with a smoke inlet 4, the third pipeline 11 is communicated with a smoke outlet 5, and the sectional area of the first pipeline 9 and the sectional area of the third pipeline 11 are both larger than that of the second pipeline 10 along the smoke conveying direction;

fourth pipeline 12, fourth pipeline 12 have a plurality of, and the one end of a plurality of fourth pipeline 12 all communicates with second pipeline 10, and the other end of a plurality of fourth pipeline 12 all communicates with third pipeline 11, and first pipeline 9, second pipeline 10, third pipeline 11 and fourth pipeline 12 constitute first hybrid cavity 7 jointly.

In this embodiment, for the problem of the waste of the aqueous ammonia or denitration effect not enough among the flue gas denitration process among the solution correlation technique, a flue gas denitration system has been designed, specifically, the flue gas passes through after the raw materials burning in burner 1 produces, receive the effect of fan and combustion gas's thermal expansion power and buoyancy, get into in the mixed pipeline 6 among the flue gas conveying pipeline 2, flow through first pipeline 9 in proper order, second pipeline 10 and third pipeline 11, first ammonia injection subassembly 8 has been set up on first pipeline 9, be used for the transport direction to the flue gas lasts the effect of spraying vaporific high pressure aqueous ammonia, aqueous ammonia after the atomizing contacts with the high temperature flue gas in the flue can evaporate for gas, mix with the flue gas, can accelerate the velocity of flow of flue gas after the high pressure aqueous ammonia sprays, but after increasing the flue gas velocity of flow, the flue gas receives the influence with the mixture of aqueous ammonia, in order to increase the flue gas in first mixed cavity 7, increase the effect of mixing with the aqueous ammonia, set up the sectional area of first pipeline 9 and the sectional area of third pipeline 11 is greater than the sectional area of second pipeline 10, and the venturi is 10, and the efficiency of flue gas is increased through venturi pipe 10, the mixed pipeline 10, the efficiency of flue gas backflow is increased to the second pipeline 10, the flue gas backflow principle of the venturi pipe 10, the flue gas is increased, the flue gas in the flue gas backflow principle of the venturi pipe 10, the flue gas backflow principle of flue gas is increased, the venturi pipe 10, the flue gas is increased.

Further, an angle α formed by the fourth pipe 12 and the second pipe 10 is an acute angle, and an angle β formed by the fourth pipe 12 and the third pipe 11 is an obtuse angle.

In this embodiment, in order to better realize the backflow of the flue gas and prevent the flue gas from being blocked when entering the fourth pipeline 12, an included angle α between the communication port formed at the communication position between the fourth pipeline 12 and the second pipeline 10 and the main flow passage is an acute angle, and an included angle β between the communication port formed at the communication position between the fourth pipeline 12 and the third pipeline 11 and the main flow passage is an obtuse angle, so that the smooth backflow of the flue gas is realized, and the backflow efficiency is increased.

Further, the flue gas conveying pipeline 2 also comprises

The ammonia subassembly 13 is spouted to the second, and the ammonia subassembly 13 is spouted to the second sets up on third pipeline 11, is located the third pipeline 11 end, with first hybrid cavity 7 intercommunication, has first control valve 14, and first control valve 14 is used for controlling the second and spouts the injection time clearance of ammonia subassembly 13, and the ammonia subassembly 13 is spouted to the second is used for spouting the aqueous ammonia along flue gas direction of delivery opposite direction intermittent type.

In this embodiment, in order to further increase the residence time of the flue gas in the first mixing cavity 7, the second ammonia spraying assembly 13 is arranged at the end of the third pipeline 11, and high-pressure atomized ammonia water is sprayed in the direction opposite to the flue gas conveying direction, so that the flue gas flow blocking effect is realized, and the amount of ammonia water can be increased, so that the flue gas in the first mixing cavity 7 and the ammonia water can be better mixed; through the ammonia interval of spouting of first control valve 14 control second ammonia subassembly 13, realize the function of intermittent type injection, avoid lasting the waste that sprays and lead to the aqueous ammonia to and the obstructed problem of flue gas circulation.

Further, the mixing duct 6 comprises

A fifth duct 15, the fifth duct 15 communicating with the third duct 11,

a sixth pipeline 16, a fifth pipeline 15 is communicated with the sixth pipeline 16, the third pipeline 11 is communicated with the smoke outlet 5 through the fifth pipeline 15 and the sixth pipeline 16, the fifth pipeline 15 and the sixth pipeline 16 form a second mixing cavity 17, and the smoke conveying pipeline 2 further comprises

And the third ammonia spraying assembly 18 is arranged on the fifth pipeline 15 and is communicated with the second mixing cavity 17, the third ammonia spraying assembly 18 is provided with a second control valve 19, the second control valve 19 is used for controlling the spraying time gap of the third ammonia spraying assembly 18, and the third ammonia spraying assembly 18 is used for intermittently spraying ammonia water along the flue gas conveying direction.

In this embodiment, since the second ammonia injection assembly 13 injects ammonia water into the first mixing cavity 7 in the opposite direction, so that the flowing speed of the flue gas is affected, in order to increase the flowing speed of the flue gas and further increase the mixing efficiency of the ammonia water, a fifth pipeline 15 and a sixth pipeline 16 are provided, and a third ammonia injection assembly 18 is provided, the flue gas enters the third pipeline 11, the second ammonia injection assembly 13 starts to rapidly inject the ammonia water to block the flowing speed of the flue gas, the pressure in the third pipeline 11 increases after the flow rate is reduced, meanwhile, the pressure in the second pipeline 10 is lower, the flue gas in the third pipeline 11 further enters the second pipeline 10 to perform better circulation, after the second ammonia injection assembly 13 stops injecting, the mixed flue gas enters the fifth pipeline 15, and the third ammonia injection assembly 18 on the fifth pipeline 15 performs intermittent injection under the action of the second control valve 19, the smoke increases the circulation speed under the drive of high-pressure ammonia water after the third ammonia spraying component 18 sprays, the pressure of the fifth pipeline 15 is reduced after the flow rate is increased, the smoke in the third pipeline 11 is sucked into the fifth pipeline 15 for rapid circulation, most of the gas preliminarily mixed in the third pipeline 11 is sucked into the fifth pipeline 15 to be mixed with the ammonia water sprayed by the third ammonia spraying component 18, the mixed gas is accelerated to flow into the sixth pipeline 16 and enter the device 3 through the sixth pipeline 16 for denitration, the denitration can be carried out in the operation process, the first ammonia spraying component 8 continuously sprays, the third ammonia spraying component 18 sprays after the second ammonia spraying component 13 stops spraying, the second ammonia spraying component 13 sprays a circulation process after the third ammonia spraying component 18 stops, the smoke and the ammonia water are fully mixed, and the reduction of the smoke flow rate is avoided while mixing, meanwhile, the injection interval and the injection amount of the second ammonia injection assembly 13 and the third ammonia injection assembly 18 can be adjusted, and waste of ammonia water is avoided.

Further, the fifth pipe 15 includes

A four-way pipeline 20, wherein a first end 21 of the four-way pipeline 20 is communicated with the third pipeline 11, and the third ammonia spraying assembly 18 is positioned at the first end 21;

one end of the annular pipeline 22 is communicated with the second end 23 of the four-way pipeline 20, the other end of the annular pipeline 22 is communicated with the third end 24 of the four-way pipeline 20, the fourth end 25 of the four-way pipeline 20 is communicated with the sixth pipeline 16, and the flue gas sequentially flows through the first end 21, the third end 24, the annular pipeline 22, the second end 23 and the fourth end 25 and then enters the sixth pipeline 16;

a fourth ammonia spraying assembly 26, wherein the fourth ammonia spraying assembly 26 is arranged at a communicating port of the annular pipeline 22 and the second end 23 and is communicated with the second mixing cavity 17, the fourth ammonia spraying assembly 26 is provided with a third control valve 27, the third control valve 27 is used for controlling the spraying time gap of the fourth ammonia spraying assembly 26, and the fourth ammonia spraying assembly 26 is used for intermittently spraying ammonia water along the flue gas conveying direction;

the rotating shafts 28 are rotatably arranged on the four-way pipeline 20 and are correspondingly arranged at the communication areas 29 of the first end 21, the second end 23, the third end 24 and the fourth end 25;

the guide plate 30, the guide plate 30 has a plurality of, sets up respectively on a plurality of pivot 28, and the guide plate 30 rotates the back, is used for making first end 21 and third end 24 communicate, or makes second end 23 and fourth end 25 communicate.

In this embodiment, because the second spouts the ammonia subassembly 13 and can lead to in the fifth pipeline 15 flue gas gets into in the third pipeline 11 when carrying out the reverse jet aqueous ammonia, lead to the unnecessary backward flow of flue gas, the backward flow of a kind of fifth pipeline 15 avoiding the flue gas has now been refined and speed and the mixing efficiency of aqueous ammonia and flue gas that the flue gas circulates further increased simultaneously, specifically speaking, after the flue gas got into fifth pipeline 15 through third pipeline 11, the first end 21 of four-way pipeline 20 flows through in proper order, the third end 24 of four-way pipeline 20, the annular duct 22, get into sixth pipeline 16 behind the second end 23 of four-way pipeline 20 and the fourth end 25 of four-way pipeline 20, the effect of preventing the flue gas backward flow is realized preventing through the guide plate 30 that sets up in the regional 29 department of intercommunication, the effect of accelerateing the circulation is realized increasing the mixing effect of flue gas and aqueous ammonia simultaneously through fourth ammonia subassembly 26, the ammonia spraying process of ammonia subassembly is when moving for the first time: the first ammonia injection assembly 8 continuously injects, the second ammonia injection assembly 13 injects and stops, the third ammonia injection assembly 18 injects, and after the third ammonia injection assembly 18 stops, the second ammonia injection assembly 13 and the fourth ammonia injection assembly 26 inject simultaneously, and when the continuous operation is performed: after second spout ammonia subassembly 13 and fourth spout ammonia subassembly 26 and spray simultaneously, third spout ammonia subassembly 18 and spray, third spout ammonia subassembly 18 and stop the back, second spout ammonia subassembly 13 and fourth spout ammonia subassembly 26 spray simultaneously and form the circulation, third spout ammonia subassembly 18 sprays in-process and blows guide plate 30 and make guide plate 30 and third spout ammonia subassembly 18's aqueous ammonia injection direction parallel, and then make first end 21 and third end 24 communicate, second end 23 and fourth end 25 are blockked by guide plate 30, blow guide plate 30 and make guide plate 30 and fourth spout ammonia subassembly 26's aqueous ammonia injection direction parallel when fourth spout ammonia subassembly 26 sprays in-process, and then make second end 23 and fourth end 25 communicate, first end 21 and third end 24 are blockked by guide plate 30, prevent the flue gas backward flow, the flue gas fully mixes with the aqueous ammonia in annular duct 22, the mixing efficiency of flue gas and aqueous ammonia has further been increased through this scheme.

Further, the fifth pipe 15 includes

A seventh pipeline 31, wherein the seventh pipeline 31 is communicated with the third pipeline 11, and the third ammonia spraying assembly 18 is positioned on the seventh pipeline 31;

an annular duct 22, one end of the annular duct 22 is communicated with the seventh duct 31, and the other end of the annular duct 22 is communicated with the sixth duct 16;

and a fourth ammonia injection assembly 26, wherein the fourth ammonia injection assembly 26 is arranged at a communication port of the annular pipeline 22 and the sixth pipeline 16, the fourth ammonia injection assembly 26 is provided with a third control valve 27, the third control valve 27 is used for controlling the injection time gap of the fourth ammonia injection assembly 26, and the fourth ammonia injection assembly 26 is used for intermittently injecting ammonia water along the flue gas conveying direction.

In this embodiment, this scheme is for increasing the circulation speed of flue gas, has ignored the flue gas backward flow problem in the fifth pipeline 15, specifically does, and the flue gas gets into seventh pipeline 31 after, and ammonia subassembly 18 is spouted along flue gas direction of delivery injection aqueous ammonia to the third and increases flue gas circulation speed, and ammonia subassembly 26 is spouted to the fourth after ammonia subassembly 18 sprays to the third, makes same part flue gas carry out the acceleration that lasts, and the process of spouting the ammonia subassembly is when first time operating: the first ammonia injection assembly 8 continuously injects, the second ammonia injection assembly 13 injects and stops, the third ammonia injection assembly 18 injects, and after the third ammonia injection assembly 18 stops, the second ammonia injection assembly 13 and the fourth ammonia injection assembly 26 inject simultaneously, and when the continuous operation is performed: after the ammonia subassembly 13 is spouted to the second and the ammonia subassembly 26 is spouted simultaneously to the fourth, the ammonia subassembly 18 is spouted to the third, and the ammonia subassembly 18 is spouted to the third stops the back, and the ammonia subassembly 13 is spouted to the second and the ammonia subassembly 26 is spouted simultaneously to the fourth sprays and forms the circulation, realizes accelerating the flue gas, increases the mixed effect of aqueous ammonia and flue gas simultaneously.

Further, the guide plate 30 is divided into two regions by the rotating shaft 28, the first region is a force application region 32, the second region is provided with a plurality of through holes 33, and the second region is a driven region 34.

In this embodiment, a guide plate 30 has been thinned, guide plate 30 is the entity if both sides, the flue gas flows through, the part of pivot 28 both sides probably leads to not taking place the upset because the stress balance, lead to the jam of flue, a guide plate 30 has now been designed, specifically guide plate 30 divide into two regions through pivot 28, the first region is the application of force region 32, the second region has a plurality of thru hole 33, the second region is driven region 34, thru hole 33 can effectually release the effort of flue gas, avoid the application of force to the second region, guide plate 30 realizes rotating, and because guide plate 30's whole appearance does not change, after guide plate 30 is parallel with the flue gas circulation direction, possess the effect of water conservancy diversion equally.

Further, also comprises

The ammonia water tank 35 is communicated with the first ammonia spraying assembly 8, the second ammonia spraying assembly 13, the third ammonia spraying assembly 18 and the fourth ammonia spraying assembly 26;

the heat exchange pipeline 36 is arranged in the ammonia water tank 35 and is provided with an inlet 37 and an outlet 38, the inlet 37 and the outlet 38 are both communicated with the combustion device 1, and the heat exchange pipeline 36 is used for preheating ammonia water after being introduced with flue gas.

In this embodiment, in order to preheat the aqueous ammonia, when avoiding the aqueous ammonia to get into mixed cavity, the temperature reduction of flue gas leads to the decline of mixing effect, and retrieve the waste heat of flue gas, the flue gas gets into heat transfer pipeline 36 in from burner 1, the heat is after giving the aqueous ammonia through the exchange of heat transfer pipeline 36, rethread export 38 gets into and keeps warm and the rewarming in burner 1, get into behind the rewarming and carry out denitration treatment in the flue gas conveying pipeline 2, further guaranteed the utilization of resource.

Further, the first ammonia injection component 8, the second ammonia injection component 13, the third ammonia injection component 18 and the fourth ammonia injection component 26 all comprise

The ammonia injection ring sleeve 39 is provided with an ammonia water circulation cavity 40 and a gas circulation cavity 41, the ammonia water circulation cavity 40 is communicated with the ammonia water tank 35, and the gas circulation cavity 41 is used for being communicated with the high-pressure gas source station;

a plurality of ammonia injection pipelines 42 are arranged on the ammonia injection ring sleeve 39 at intervals and are communicated with the ammonia water circulation cavity 40, a circulation gap 43 is arranged between every two adjacent ammonia injection pipelines 42, and the circulation gap 43 is used for the circulation of smoke;

and the ammonia water spray head 44 is arranged on the ammonia spraying ring sleeve 39, is communicated with the ammonia water circulation cavity 40 and the gas circulation cavity 41, and is used for spraying atomized high-pressure ammonia water.

In this embodiment, a spout ammonia subassembly has been refined, and the flue gas realizes the circulation through circulation clearance 43, and the aqueous ammonia gets into in spouting ammonia ring cover 39, and then gets into and spouts ammonia pipe 42, and the aqueous ammonia circulation cavity 40 that passes through in spouting ammonia pipe 42 gets into aqueous ammonia shower nozzle 44 in with high-pressure gas mixture, realizes the high-pressure injection of atomizing.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a flue gas denitration system, includes burner (1), flue gas conveying pipeline (2) and denitrification facility (3) that communicate in proper order, the one end of flue gas conveying pipeline (2) with the intercommunication mouth of burner (1) intercommunication is into mouth (4), the other end of flue gas conveying pipeline (2) with the intercommunication mouth of denitrification facility (3) intercommunication is out mouth (5), its characterized in that, flue gas conveying pipeline (2) include

A mixing duct (6), the mixing duct (6) having a first mixing cavity (7);

the first ammonia spraying assembly (8) is arranged on the mixing pipeline (6), communicated with the first mixing cavity (7) and used for spraying ammonia water along the flue gas conveying direction;

the mixing duct (6) comprises

A first pipe (9), wherein the first ammonia injection assembly (8) is positioned on the first pipe (9);

the first pipeline (9), the second pipeline (10) and the third pipeline (11) are sequentially communicated, the first pipeline (9) is communicated with the smoke inlet (4), the third pipeline (11) is communicated with the smoke outlet (5), and the sectional area of the first pipeline (9) and the sectional area of the third pipeline (11) are both larger than that of the second pipeline (10) along the smoke conveying direction;

a plurality of fourth pipelines (12), wherein one end of each of the plurality of fourth pipelines (12) is communicated with the second pipeline (10), the other end of each of the plurality of fourth pipelines (12) is communicated with the third pipeline (11), and the first pipeline (9), the second pipeline (10), the third pipeline (11) and the fourth pipelines (12) jointly form a first mixing cavity (7);

the flue gas conveying pipeline (2) also comprises

The second ammonia spraying assembly (13) is arranged on the third pipeline (11), is positioned at the tail end of the third pipeline (11), is communicated with the first mixing cavity (7), and is provided with a first control valve (14), the first control valve (14) is used for controlling the spraying time gap of the second ammonia spraying assembly (13), and the second ammonia spraying assembly (13) is used for intermittently spraying ammonia water in the direction opposite to the flue gas conveying direction;

the mixing duct (6) comprises

A fifth duct (15), said fifth duct (15) communicating with said third duct (11);

a sixth pipeline (16), the fifth pipeline (15) is communicated with the sixth pipeline (16), the third pipeline (11) is communicated with the smoke outlet (5) through the fifth pipeline (15) and the sixth pipeline (16), the fifth pipeline (15) and the sixth pipeline (16) form a second mixing cavity (17), and the smoke conveying pipeline (2) further comprises a smoke conveying pipeline (2)

A third ammonia injection assembly (18), wherein the third ammonia injection assembly (18) is arranged on the fifth pipeline (15) and communicated with the second mixing cavity (17), the third ammonia injection assembly (18) is provided with a second control valve (19), the second control valve (19) is used for controlling the injection time gap of the third ammonia injection assembly (18), and the third ammonia injection assembly (18) is used for intermittently injecting ammonia water along the conveying direction of the flue gas;

the fifth pipeline (15) comprises

A four-way pipe (20), wherein a first end (21) of the four-way pipe (20) is communicated with the third pipe (11), and the third ammonia injection assembly (18) is positioned on the first end (21);

one end of the annular pipeline (22) is communicated with a second end (23) of the four-way pipeline (20), the other end of the annular pipeline (22) is communicated with a third end (24) of the four-way pipeline (20), a fourth end (25) of the four-way pipeline (20) is communicated with the sixth pipeline (16), and the flue gas sequentially flows through the first end (21), the third end (24), the annular pipeline (22), the second end (23) and the fourth end (25) and then enters the sixth pipeline (16);

a fourth ammonia injection assembly (26), wherein the fourth ammonia injection assembly (26) is arranged at a communication port of the annular pipeline (22) and the second end (23) and is communicated with the second mixing cavity (17), the fourth ammonia injection assembly (26) is provided with a third control valve (27), the third control valve (27) is used for controlling the injection time gap of the fourth ammonia injection assembly (26), and the fourth ammonia injection assembly (26) is used for intermittently injecting ammonia water along the conveying direction of the flue gas;

the rotating shafts (28) are provided with a plurality of rotating shafts (28), are rotatably arranged on the four-way pipeline (20), and are correspondingly arranged at the communication areas (29) of the first end (21), the second end (23), the third end (24) and the fourth end (25);

the guide plate (30), the guide plate (30) have a plurality ofly, set up respectively in a plurality of pivot (28), guide plate (30) rotate the back, be used for making first end (21) with third end (24) intercommunication, or make second end (23) with fourth end (25) intercommunication.

2. A flue gas denitration system according to claim 1, wherein an angle α formed by the fourth pipe (12) and the second pipe (10) is an acute angle, and an angle β formed by the fourth pipe (12) and the third pipe (11) is an obtuse angle.

3. A flue gas denitration system according to claim 1, wherein the fifth duct (15) comprises

A seventh conduit (31), said seventh conduit (31) being in communication with said third conduit (11), said third ammonia injection assembly (18) being located on said seventh conduit (31);

an annular duct (22), one end of the annular duct (22) being in communication with the seventh duct (31), the other end of the annular duct (22) being in communication with the sixth duct (16);

and a fourth ammonia injection assembly (26), wherein the fourth ammonia injection assembly (26) is arranged at a communication port of the annular pipeline (22) and the sixth pipeline (16), the fourth ammonia injection assembly (26) is provided with a third control valve (27), the third control valve (27) is used for controlling the injection time gap of the fourth ammonia injection assembly (26), and the fourth ammonia injection assembly (26) is used for intermittently injecting ammonia water along the smoke conveying direction.

4. A flue gas denitration system according to claim 1, wherein said rotary shaft (28) divides said baffle (30) into two regions, a first region being a force application region (32), a second region having a plurality of through holes (33), and said second region being a driven region (34).

5. The flue gas denitration system of claim 1 or 3, further comprising

The ammonia water tank (35) is communicated with the first ammonia spraying assembly (8), the second ammonia spraying assembly (13), the third ammonia spraying assembly (18) and the fourth ammonia spraying assembly (26);

heat transfer pipeline (36), heat transfer pipeline (36) set up in ammonia tank (35), have import (37) and export (38), import (37) with export (38) all with burner (1) intercommunication, heat transfer pipeline (36) let in and are used for preheating the aqueous ammonia behind the flue gas.

6. The flue gas denitration system of claim 5, wherein the first ammonia injection assembly (8), the second ammonia injection assembly (13), the third ammonia injection assembly (18) and the fourth ammonia injection assembly (26) comprise

The ammonia spraying ring sleeve (39) is provided with an ammonia water circulation cavity (40) and a gas circulation cavity (41), the ammonia water circulation cavity (40) is communicated with the ammonia water tank (35), and the gas circulation cavity (41) is used for being communicated with a high-pressure gas source station;

the ammonia injection pipelines (42) are arranged on the ammonia injection annular sleeve (39) at intervals, are communicated with the ammonia water circulation cavity (40), and are provided with circulation gaps (43) between every two adjacent ammonia injection pipelines (42), wherein the circulation gaps (43) are used for the circulation of the smoke;

and the ammonia water spray head (44) is arranged on the ammonia spraying ring sleeve (39), communicated with the ammonia water circulation cavity (40) and the gas circulation cavity (41) and used for spraying atomized high-pressure ammonia water.