CN204817009U

CN204817009U - A pneumatic telescopic wear -resisting sprayer for SNCR flue gas denitration

Info

Publication number: CN204817009U
Application number: CN201520564263.5U
Authority: CN
Inventors: 赵立志
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-07-29
Filing date: 2015-07-29
Publication date: 2015-12-02
Anticipated expiration: 2025-07-29

Abstract

The utility model discloses a pneumatic telescopic wear -resisting sprayer for SNCR flue gas denitration, it includes the sprayer body, its technical essential lies in: the sprayer body is the body that has nitrogen oxide reductant import with spray the export, and this sprayer body is through fixing inside mounting sleeve on the boiler lateral wall stretches into furnace, the nitrogen oxide reductant entrance point of sprayer body still overlaps to the mounting sleeve tip and is equipped with telescopic cylinder, and telescopic cylinder's radial both ends are passed through the air hose and are connected pneumatic control valve, are provided with the cylinderpiston who fixes with the sprayer body in telescopic cylinder. The utility model provides a telescopic machanism can control accurately the sprayer gos deep into the position in the furnace, simple structure, easily installation, dismantlement, the consumptive material is few, the cost is reduced, only need simple each part equipment to make, when having saved manufacturing and maintainer.

Description

The wear-resisting injector of a kind of pneumatic extension for SNCR denitrating flue gas

Technical field

The utility model relates to a kind of pneumatic extension injector, relates in particular to the wear-resisting injector of a kind of pneumatic extension for SNCR denitrating flue gas, belongs to gas denitrifying technology field.

Background technology

Along with the quickening of process of industrialization, industrial fuel consumption continues to increase, can to a large amount of pollutant of environmental emission while power conversion is carried out in fuel combustion, wherein, the nitrogen oxide (NOx) be discharged in air can cause photochemical pollution with hydrocarbon under high light effect, and NOx still forms the main cause of acid rain, become important environmental pollution prevention and control object in recent years.And the NOx of domestic about 65% produced by coal combustion, the focus that the discharge therefore also having become control NOx as station boiler and the Industrial Boiler of main coal combustion equipment is paid close attention to.

At present, in the method for numerous boiler NO_x removal, SNCR method (SelectiveNon-CatalyticReduction, be called for short SNCR) be widely applied because of the advantage such as there is small investment, occupation area of equipment is little, construction is simple, equipment operating cost is low, under SNCR refers to the effect of catalyst-free, injection reduction agent in the high-temperature flue gas of 850-1150 DEG C, optionally there is chemical reaction with the NOx in flue gas in reducing agent, generate harmless nitrogen and water, thus realize the control to NOx discharge.

Injector is one of core component in SNCR denitration system, and spray in high temperature reaction stove for going deep into body of heater by reducing agent, injector is in the severe environment for use of high temperature, high ash concentration for a long time, and reductant solution has caustic corrosion usually; Ordinary injectors uses in such circumstances, easy burn-out, blocking, and cause spraying resistance increase, nozzle flow reduces, atomization mixed effect is deteriorated, thus denitration efficiency reduces, injector is short for service life, need often change.For solving the problems of the technologies described above, Chinese patent literature CN103691607A discloses the special retractor device of a kind of SNCR denitrification spray gun, comprise source of the gas bigeminy part, compressed air piping, 3 position-5 way magnetic valve, guide rail, cylinder slide block, movable stand, protective cover, gag lever post, protective cover is also provided with fixed cover, protective cover flange, and steel pipe socket; Cylinder slide block drives movable stand motion, and then drive the spray gun be connected with movable stand advance or retreat, achieve the stretching motion of spray gun, avoid the working environment that spray gun is in high temperature, high dust for a long time, and regulate the degree of depth in spray gun insertion boiler by adjustment gag lever post.But, in such scheme, gag lever post is threaded rod, needs by regulating spray gun to enter the degree of depth in boiler with nut screw connection, this stopping means is accurate not, particularly after a long time use, the screw thread of gag lever post and nut is worn, and is difficult to clamping, the distance that gag lever post screws in nut is difficult to accurate control, causing spray gun to enter the degree of depth in boiler cannot fine adjustment, and when thread abrasion is serious, gag lever post easily comes off from nut; And need often to disassemble outer protective cover to gag lever post and nut lubricating maintenance, operation is comparatively complicated.In addition, in such scheme, protective cover is also provided with fixed cover, protective cover flange and the steel pipe socket be welded on protective cover flange, complex structure, each parts make loaded down with trivial details, and due to the size of fixed cover, fixed cover be all fixing, this retractor device is only applicable to specific SNCR denitrification spray gun.

Utility model content

For this reason, technical problem to be solved in the utility model is that the retractor device of SNCR denitrating flue gas injector in prior art is difficult to maintenance, and complex structure, range of application is little, thus it is simple to propose a kind of structure, the wear-resisting injector of the pneumatic extension for SNCR denitrating flue gas only need simply assembled.

For solving the problems of the technologies described above, the technical solution of the utility model is as follows:

The wear-resisting injector of a kind of pneumatic extension for SNCR denitrating flue gas, it comprises ejector body, described ejector body is the body with NOx reducing agent import and jet exit, and this ejector body stretches into burner hearth inside by the mounting sleeve be fixed in boiler side walls; Also be set with telescopic cylinder at the NOx reducing agent entrance point of described ejector body to mounting sleeve end, the radial two ends of telescopic cylinder connect pneumatic control valve by air hose, are provided with the cylinder piston fixing with ejector body in telescopic cylinder.

Further technical scheme, is fixed with at the interlayer of described mounting sleeve and ejector body the high-temperature wearable protection tube stretched in burner hearth.

Further technical scheme, is provided with air punching press ring at the radial two ends of described cylinder piston.

Technique scheme of the present utility model has the following advantages compared to existing technology:

(1) the wear-resisting injector of this pneumatic extension accurately can control the position that described injector gos deep in burner hearth, and structure is simple, and consumptive material is few, reduces cost, and each parts only need simple assembling to obtain, and save manufacture and maintenance man-hours; In addition, the utility model structure is simple, is easy to install, dismantle.

(2) under described injector is in high-temperature work environment for a long time, be easily worn, service life is shortened.Described injector end is provided with wear-resistant protection pipe, and described wear-resistant protection pipe adopts heat resistant and wear resistant material; Cooling air is passed in described injector mounting sleeve, can injector described in effective cooling, prevent described injector to be at high temperature out of shape, to wear and tear, extend the service life of injector.

Accompanying drawing explanation

In order to make content of the present utility model be more likely to be clearly understood, below according to accompanying drawing of the present utility model, the utility model is described in further detail, wherein

Fig. 1 is the schematic diagram of the wear-resisting injector of the pneumatic extension for SNCR denitrating flue gas provided by the utility model;

In figure, Reference numeral is expressed as: high-temperature wearable protection tube (1), ejector body (3), mounting sleeve (4), cylinder piston (5), pneumatic control valve (6), air hose (7), telescopic cylinder (8)

Detailed description of the invention

Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

The wear-resisting injector of the pneumatic extension for SNCR denitrating flue gas that the utility model provides, comprise ejector body 3, described ejector body 3 is the body with NOx reducing agent import and jet exit, this ejector body 3 stretches into burner hearth inside by the mounting sleeve 4 be fixed in boiler side walls 2, and described mounting sleeve 4 is fixed with the interlayer of ejector body 3 the high-temperature wearable protection tube 1 stretched in burner hearth; Telescopic cylinder 8 is also set with to mounting sleeve 4 end at the NOx reducing agent entrance point of described ejector body 3, the radial two ends of telescopic cylinder 8 connect pneumatic control valve 6 by air hose 7, are provided with the cylinder piston 5 fixing with ejector body 3 in telescopic cylinder 8.

Inflate promotion cylinder piston 5 for the ease of pneumatic control valve 6 by air hose 7, the radial two ends of described cylinder piston (5) are provided with air punching press ring.

Operation principle: pneumatic control valve 6 controls compressed air enters telescopic cylinder 8 two ends by air hose 7, realize the movable of cylinder piston 5, cylinder piston 5 drives ejector body 3 to move reciprocatingly.When described injector is started working, described pneumatic control valve 6 starts, described cylinder piston 5 drives described ejector body 3 forward slip, described ejector body 3 is admitted to high-temperature burner hearth gradually, after arriving assigned address, NOx reducing agent is added from the NOx reducing agent import of ejector body 3, and by the NOx reducing agent jet exit of ejector body 3 to injection reduction agent in the high-temperature flue gas of 850-1150 DEG C, optionally there is chemical reaction with the NOx in flue gas in reducing agent, generate harmless nitrogen and water, thus the control realized NOx discharge, when described injector quits work, again start described pneumatic control valve 6, described cylinder piston 5 drives described ejector body 3 to sliding in the other direction, and described injector is extracted out gradually in high-temperature burner hearth, i.e. complete operation.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims

1. the wear-resisting injector of the pneumatic extension for SNCR denitrating flue gas, it comprises ejector body (3), it is characterized in that: described ejector body (3) is the body with NOx reducing agent import and jet exit, and this ejector body (3) stretches into burner hearth inside by the mounting sleeve (4) be fixed in boiler side walls (2); Telescopic cylinder (8) is also set with to mounting sleeve (4) end at the NOx reducing agent entrance point of described ejector body (3), the radial two ends of telescopic cylinder (8) connect pneumatic control valve (6) by air hose (7), are provided with the cylinder piston (5) fixing with ejector body (3) in telescopic cylinder (8).

2. the wear-resisting injector of the pneumatic extension for SNCR denitrating flue gas according to claim 1, is characterized in that: be fixed with at described mounting sleeve (4) and the interlayer of ejector body (3) the high-temperature wearable protection tube (1) stretched in burner hearth.

3. the wear-resisting injector of the pneumatic extension for SNCR denitrating flue gas according to claim 1, is characterized in that: the radial two ends of described cylinder piston (5) are provided with air punching press ring.