CN104524958B

CN104524958B - For the concentrated ammonia liquor on-line dilution device of SNCR denitrating system

Info

Publication number: CN104524958B
Application number: CN201510038099.9A
Authority: CN
Inventors: 杨健
Original assignee: Hunan Lunan Desulfurization & Denitration Technology Co Ltd
Current assignee: Hunan Lunan Desulfurization & Denitration Technology Co Ltd
Priority date: 2015-01-27
Filing date: 2015-01-27
Publication date: 2016-05-11
Anticipated expiration: 2035-01-27
Also published as: CN104524958A

Abstract

The invention discloses a kind of concentrated ammonia liquor on-line dilution device for SNCR denitrating system, comprise the diluter being formed by the central tube of housing and its longitudinal center, the inlet tube that is communicated with its inner chamber is arranged at housing outer wall top, and the lower end of central tube is that openend, upper end are connected with the outlet being communicated with spray gun in boiler furnace. The upper end closed of housing, lower end is connected with slag storage tube. The front end of inlet tube is oriented its interior nozzle that sprays concentrated ammonia liquor of dilution water entrance, sidewall, dilution water and concentrated ammonia liquor enter cavity mesoscale eddies between housing and central tube after mixing descending, after further mixing, enter central tube transfer inlet/outlet pipe, the lance ejection atomization that finally enters burner hearth. The path of weak ammonia circulation be cavity entirely, only has very little pipeline loss, enters flow velocity in spray gun fast, atomizing effect when raising lance ejection, the denitration rate of raising system to flue gas. Cavity between housing and central tube can also be removed the impurity in weak ammonia, avoids stopping up the nozzle of spray gun.

Description

For the concentrated ammonia liquor on-line dilution device of SNCR denitrating system

Technical field

The present invention relates to a kind of SNCR denitrating system, be specifically related to the concentrated ammonia liquor on-line dilution device in a kind of SNCR denitrating system.

Background technology

SNCR denitration is taking boiler furnace as denitration reaction device, sprays into dilute ammonia solution the temperature range of 850 DEG C to 1100 DEG C, and outsourcing ammonia concn is in 20% left and right, and need to before injection, be diluted to concentration is 10%.

Current SNCR denitration ammoniacal liquor air mix facilities substantially adopts double-skin duct formula or the structure of hybrid blade is set in pipeline, there are two problems in them: is first that SR is excessive, the resistance that resistance between double-skin duct and pipeline intra vane cause liquid flow, can make the weak aqua ammonia jeting effect after dilution influenced; Next is that impurity in dilution water and ammoniacal liquor can not be filtered before the nozzle that enters burner hearth spray gun, and long-term use can make nozzle easily accumulate impurity in solution and plug nozzle, further reduces the atomizing effect of nozzle ejection weak aqua ammonia.

Summary of the invention

The object of the present invention is to provide the concentrated ammonia liquor on-line dilution device that a kind of stable performance, resistance are little, improve burner hearth lance ejection weak aqua ammonia effect, improve the denitration rate of SNCR denitrating system to flue gas.

The invention discloses a kind of concentrated ammonia liquor on-line dilution device for SNCR denitrating system, comprise the diluter being formed by the central tube of housing and its longitudinal center, the inlet tube that is communicated with its inner chamber is arranged at housing outer wall top, the lower end of central tube is that openend, upper end are connected with the outlet being communicated with spray gun in boiler furnace, the upper end closed of housing, lower end is connected with slag storage tube, and the front end of inlet tube is the ammonia spray nozzle that sprays concentrated ammonia liquor in dilution water entrance, the oriented dilution water flow of sidewall.

Described housing is formed by connecting up and down by cylinder and taper shape bucket, the upper surface that the lower end of central tube is stretched in conical bucket, cylinder is passed in upper end.

Described inlet tube is square tube, along the tangential connection of described cylinder outer wall.

Described ammonia spray nozzle has two rows, is symmetrically arranged in the arranged on left and right sides of inlet tube front end.

The lower end inwall of described slag storage tube has been threaded connection plug.

The present invention respectively arranges row's nozzle at inlet tube perpendicular to the both sides of dilution water flow and spray into concentrated ammonia liquor in dilution water flow, ensure to realize and spray making up mutually of coverage rate between two side nozzles, can carry out non-blind area injection to dilution water flow, realize the uniformity that ammoniacal liquor dilution mixes. After concentrated ammonia liquor and dilution water mix in inlet tube along housing tangentially to enter cavity mesoscale eddies between housing and central tube descending, further strengthen mixed effect, then from the lower end of central tube enters wherein, up continuation mixes, proceed to outlet from the top of central tube, finally enter the lance ejection atomization that is arranged on boiler furnace and realize SNCR denitration reaction.

Said structure makes concentrated ammonia liquor from entering dilution to the lance ejection atomization that enters boiler furnace, the path of mixed solution circulation is all cavity, without any obstacle, do not increase extra resistance, only has pipeline loss, compare with built-in vane type ammoniacal liquor blender with traditional inside and outside tubular type ammoniacal liquor blender, energy loss on whole circulation path is very little, enter in burner hearth the flow velocity in spray gun fast, atomizing effect while improving spray tip injection, thereby the denitration rate of raising system to flue gas.

In the cavity mesoscale eddies of mixed solution between housing and central tube is descending, impurity in solution is because the effect of centrifugal force is thrown on the inwall of housing, then under the effect of self gravitation, spiral decline enters in slag storage tube after taper shape bucket gradually, dilute ammonia solution after removal of impurities has avoided the nozzle of spray gun to get clogged, atomizing effect while further improving nozzle ejection weak aqua ammonia, thereby further improve the denitration rate of flue gas, extend spray gun service life.

Brief description of the drawings

Fig. 1 is the main TV structure schematic diagram of an example of the present invention.

Fig. 2 is the schematic top plan view of Fig. 1.

Fig. 3 is the layout schematic diagram of inlet tube inner nozzle in Fig. 1.

Detailed description of the invention

As shown in Figure 1 to Figure 3, the invention discloses a kind of concentrated ammonia liquor on-line dilution device for SNCR denitrating system, comprise housing 1, inlet tube 2, central tube 3, outlet 4, slag storage tube 5 and plug 6. Housing 1 is formed by connecting up and down by cylinder 11 and conical bucket 12, and the upper end of cylinder 11 is blind end. Inlet tube 2 is square tube, along the tangential connection of cylinder 11 outer walls, is communicated with the inner chamber of cylinder 11. Central tube 3 is positioned at the axial centre of housing 1, the upper surface that its lower end is stretched in conical bucket 12, cylinder 11 is passed in upper end. Outlet 4 is connected in the upper end of central tube 3, and its port of export is communicated with the spray gun in boiler furnace. Slag storage tube 5 is connected in the port of export of conical bucket 12, and its lower end inwall is threaded connection plug 6. The front end of inlet tube 2 is dilution water entrance, the external symmetry of arranged on left and right sides wall is furnished with concentrated ammonia liquor pipe 7, on ammonia water pipe 7, corresponding import pipeline section is connected with some taps 8 that stretch in inlet tube 2, the end of tap 8 connects nozzle 9, the cross section that the layout of nozzle 9 covers inlet tube 2 with effective spray regime 100% of two side nozzles is as the criterion, and ensures that dilution water fully mixes with 100% of concentrated ammonia liquor.

Mixed solution is tangentially to enter in the cavity between central tube outer wall and inner walls, in this cavity, the stroke of mixed solution is vortex shape, in strengthening mixed effect, the proportion impurity different from liquid is because the effect of centrifugal force is thrown to inner walls, under Action of Gravity Field, spiral drops in the slag storage tube of conical bucket lower end gradually, realize the effect of removal of contamination, prevent that the spray tip in boiler furnace from being blocked by impurity. Weak ammonia solution after removal of contamination enters in central tube to continue to mix to reach after design concentration and is folded to and enters outlet, finally enters the lance ejection atomization that is arranged on boiler furnace and realizes SNCR denitration reaction.

Said structure of the present invention makes concentrated ammonia liquor from entering dilution to the lance ejection atomization that enters boiler furnace, mixing material is along reasonably path circulation, without any obstacle, compare with built-in vane type ammoniacal liquor blender with traditional inside and outside tubular type ammoniacal liquor blender, the SR of mixing material reduces greatly, thereby improves follow-up denitration effect. Simultaneously centrifugal force and Action of Gravity Field realized remove mixing material in the function of impurity, the hidden danger of having avoided the impurity in mixing material to block spray gun in boiler furnace. Impurity in slag storage tube can be removed by dismounting plug.

Claims

1. the concentrated ammonia liquor on-line dilution device for SNCR denitrating system, it is characterized in that: this device comprises the diluter being made up of the central tube of housing and its longitudinal center, the inlet tube that is communicated with its inner chamber is arranged at housing outer wall top, the lower end of central tube is that openend, upper end are connected with the outlet being communicated with spray gun in boiler furnace, the upper end closed of housing, lower end is connected with slag storage tube, and the front end of inlet tube is the ammonia spray nozzle that sprays concentrated ammonia liquor in dilution water entrance, the oriented dilution water flow of sidewall; Described housing is formed by connecting up and down by cylinder and taper shape bucket, the upper surface that the lower end of central tube is stretched in conical bucket, cylinder is passed in upper end; Described inlet tube is square tube, along the tangential connection of described cylinder outer wall.

2. the concentrated ammonia liquor on-line dilution device for SNCR denitrating system as claimed in claim 1, is characterized in that: described ammonia spray nozzle has two rows, is symmetrically arranged in the arranged on left and right sides of described inlet tube front end.

3. the concentrated ammonia liquor on-line dilution device for SNCR denitrating system as claimed in claim 1, is characterized in that: the lower end inwall of described slag storage tube has been threaded connection plug.