CN209378804U - SCR denitration reducing agent mixing arrangement - Google Patents

Abstract

The utility model provides SCR denitration reducing agent mixing arrangement, including smoke discharging pipe, vortex mixing plate is placed in bottom in the smoke discharging pipe, the vortex mixing plate right end is fixedly connected by bracket with jet pipe, the jet pipe is arranged on the upside of vortex mixing plate, the jet pipe right end stretches out on the right side of smoke discharging pipe, the smoke discharging pipe lower end is fixedly connected with shield, the shield lower end is fixedly connected by bolt with disassembly mechanism, the design is disturbed naturally using elbow and the forced disturbance of vortex mixing plate, even for the shorter situation of gas approach length, it is still able to achieve reducing agent and is uniformly mixed with flue gas, guarantee the uniformity of reactor flow field.

Description

SCR denitration reducing agent mixing arrangement

Technical field

The utility model is SCR denitration reducing agent mixing arrangement, belongs to SCR denitration apparatus field.

Background technique

The mainstream technology of thermal power generation unit NOx emission control is selective catalytic reduction reaction (SCR), principle be It in 300-400 DEG C of temperature range, sprays reductant into flue and is sufficiently mixed with flue gas, into the denitration reaction in downstream Device removes the nitrogen oxides in flue gas under the catalytic action of catalyst, generates harmless nitrogen and water.

NH3/NOx mixing uniformity seriously affects denitration efficiency in SCR reactor, especially for require minimum discharge, The higher engineering project of denitration efficiency.Due to reducing agent the amount of injection compared with exhaust gas volumn very little, while the sectional area of flue compared with Greatly, it is the key that denitrating system design and difficult point that flue gas and reducing agent, which are sufficiently mixed,.

Existing reducing agent mixing arrangement generallys use ammonia-spraying grid etc., since its spout bore is smaller, in flue gas flying dust It under the conditions of concentration is higher, easily blocks, influences putting into operation for system；Simultaneously ammonia-spraying grid under the conditions of boiler varying duty, It is poor to the adaptability of flue gas incoming flow, therefore be difficult to meet the requirement of SCR denitration system operation.

Reducing agent mixing arrangement is routinely arranged in horizontal flue or vertical well gas flue, for transformation project, space denitration after furnace System is disposed with limitation, when denitration gas approach is shorter, is mixed with and seriously affects with flue gas to reducing agent, and is existing Catalytic plate used in SCR denitration reducing agent mixing arrangement usually dismounts inconvenience, is not easy to maintenance replacement, and using effect is low.

Utility model content

In view of the deficienciess of the prior art, the utility model aim is to provide SCR denitration reducing agent mixing arrangement, with solution Certainly the problems mentioned above in the background art, the utility model is easy to use, convenient for operation, improves mixed effect, and be convenient for Disassembling, assembling and replacing facilitates maintenance.

To achieve the goals above, the utility model is achieved through the following technical solutions: SCR denitration reducing agent is mixed It attaches together and sets, including smoke discharging pipe, vortex mixing plate is placed in bottom in the smoke discharging pipe, and the vortex mixing plate right end passes through branch Frame is fixedly connected with jet pipe, and the jet pipe is arranged on the upside of vortex mixing plate, and the jet pipe right end stretches out on the right side of smoke discharging pipe, The smoke discharging pipe lower end is fixedly connected with shield, and the shield lower end is fixedly connected by bolt with disassembly mechanism, the disassembly Mechanism includes movable pulley, supporting leg, tank body, catalytic plate, fixed link, O-ring, position-limiting tube and grid, and the movable pulley is fixed In supporting leg lower end surface, the supporting leg is bolted on tank body annular side lower end, and lattice are placed in lower part in the tank body Grid, grid upper end middle position are fixedly connected by bolt with fixed link, the fixed link annular side suit position-limiting tube, O-ring and catalytic plate, the tank body upper end are detachably connected by bolt and shield, and the O-ring is arranged on catalytic plate Lower both ends.

In one embodiment, smoke discharging pipe annular side lower right processes gas outlet, and gas outlet right end and reflux Pipeline is connected, smoke discharging pipe annular side upper end left part processing gas inlet mouth, the reflux line other end and air inlet It is connected, solenoid valve, fixed check valve on the air inlet and gas outlet is installed on the reflux line.

In one embodiment, the catalytic plate is equipped with three pieces, and three pieces of catalytic plates are sleeved on fixed link annular side On.

In one embodiment, the vortex mixing plate uses round or ellipse plate, setting angle and horizontal direction in- 70°~70°。

In one embodiment, anti-skid chequer is processed at the top of the fixed link annular side, tank body annular side lower part is in Pyramidal structure.

The utility model has the beneficial effects that the SCR denitration reducing agent mixing arrangement of the utility model, the utility model pass through Smoke discharging pipe, vortex mixing plate, jet pipe and shield are added, which disturbs naturally using elbow and the pressure of vortex mixing plate Disturbance, even for the shorter situation of gas approach length, is still able to achieve reducing agent and uniformly mixes with flue gas, guarantees in reactor The uniformity in flow field solves former agent mixing arrangement and generallys use ammonia-spraying grid etc., since its spout bore is smaller, flies in flue gas It under the conditions of ash concentration is higher, easily blocks, influences putting into operation for system, while ammonia-spraying grid is in boiler varying duty condition Under, the problem poor to the adaptability of flue gas incoming flow.

Because of addition movable pulley, supporting leg, tank body, catalytic plate, fixed link, O-ring, position-limiting tube and grid, design benefit It is moved with movable pulley, then by lifting fixed link to be taken out to catalytic plate, and then catalytic plate is dismantled more It changes, it is easy to operate, facilitate maintenance, solves catalytic plate used in existing SCR denitration reducing agent mixing arrangement and usually dismount Inconvenience is not easy to the problem of maintenance is replaced.

Because adding reflux line, which is convenient for the reflux of extra flue gas, and it is excessive to avoid smoke discharging pipe pressure, this reality With novel easy to use, convenient for operation, mixed effect, and replacement easy to disassemble improved, maintenance is facilitated.

Detailed description of the invention

Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other spies of the utility model Sign, objects and advantages will become more apparent upon:

Fig. 1 is the structural schematic diagram of the utility model SCR denitration reducing agent mixing arrangement；

Fig. 2 is the diagrammatic cross-section of disassembly mechanism in the utility model SCR denitration reducing agent mixing arrangement；

Fig. 3 is the structural schematic diagram of grid in the utility model SCR denitration reducing agent mixing arrangement；

In figure: 1- smoke discharging pipe, 2- vortex mixing plate, 3- jet pipe, 4- disassembly mechanism, 5- shield, 41- movable pulley, 42- branch Support leg, 43- tank body, 44- catalytic plate, 45- fixed link, 46-O type circle, 47- position-limiting tube, 48- grid.

Specific embodiment

Before describing the embodiments in more detail, it should be understood that the utility model is not limited in the application hereafter or attached drawing Described in detailed construction or arrangement of elements.The embodiment that the utility model can be realized for other way.Moreover, it should manage Solution, the words and terms used herein are for illustrative purposes only, should not be interpreted in a limited way." packet used herein Include ", "comprising", the similar wording such as " having " means comprising items listed thereafter, its equivalent and other additional things.It is special It is not that when describing " a certain component ", it also may include more that the utility model, which does not limit the quantity of the element as one, It is a.

Fig. 1-Fig. 3 is please referred to, the utility model provides a kind of technical solution: SCR denitration reducing agent mixing arrangement, including row Smoke pipeline 1, vortex mixing plate 2 is placed in bottom in smoke discharging pipe 1, and 2 right end of vortex mixing plate connects by the way that bracket and jet pipe 3 are fixed It connects, jet pipe 3 is arranged in 2 upside of vortex mixing plate, and 3 right end of jet pipe stretches out on the right side of smoke discharging pipe 1, and 1 lower end of smoke discharging pipe is fixed Shield 5 is connected, 5 lower end of shield is fixedly connected by bolt with disassembly mechanism 4, and user of service is by 1 left end of smoke discharging pipe and boiler Back-end ductwork is connected, and 3 right end of jet pipe is connected with situ reduction agent conveying equipment, and then boiler smoke enters smoke exhaust pipe Road 1, and be in contact with the vortex mixing plate 2 of 1 elbow of smoke discharging pipe, while reducing agent is sprayed by jet pipe 3, and is sprayed to Vortex mixing plate 2 acts on by the common strong flow-disturbing in the elbow of smoke discharging pipe 1 and vortex mixing plate 2, realizes reducing agent and pot Kiln gas uniformly mixes, and subsequent boiler smoke and reducing agent enter in shield 5 along smoke discharging pipe 1.

Disassembly mechanism 4 includes movable pulley 41, supporting leg 42, tank body 43, catalytic plate 44, fixed link 45, O-ring 46, limit Pipe 47 and grid 48, movable pulley 41 are fixed on 42 lower end surface of supporting leg, and supporting leg 42 is bolted on 43 annular of tank body Side lower end, grid 48 is placed in lower part in tank body 43, and 48 upper end middle position of grid is fixedly connected by bolt with fixed link 45, 45 annular side of fixed link suit position-limiting tube 47, O-ring 46 and catalytic plate 44, the design of position-limiting tube 47 are then convenient for catalytic plate 44 are supported, and avoid catalytic plate 44 from leaning on each other too close, to improve catalytic effect, 43 upper end of tank body passes through bolt It is detachably connected with shield 5, O-ring 46 is arranged in 44 upper and lower ends of catalytic plate, and the design of O-ring 46 then realizes the function of sealing Can, avoid gap of the flue gas between catalytic plate 44 and fixed link 45 from passing through, then boiler smoke is urged by catalytic plate 44 Change, catalytic plate 44 then carries out denitration to boiler smoke, to realize the purpose of minimum discharge, using in the 44 upper time of catalytic plate is needed When being replaced, user of service's rotating bolt realizes that tank body 43 is separated with 5 phase of shield, and then user of service passes through movable pulley 41 pairs of tank bodies 43 move, and then user of service is by holding fixed link 45, and moves up lifting, to drive Grid 48 moves up, and grid 48, which moves up, drives position-limiting tube 47, O-ring 46 and catalytic plate 44 to move up, Jin Ershi Existing catalytic plate 44 takes out inside tank body 43, then replaces to the catalytic plate of damage 44, realizes the function of dismounting and change, Facilitate maintenance.

1 annular side lower right of smoke discharging pipe processes gas outlet, and gas outlet right end is connected with reflux line, smoke exhaust pipe 1 annular side upper end left part processing gas inlet mouth of road, the reflux line other end are connected with air inlet, and electromagnetism is installed on reflux line The one-way flow of flue gas is convenient in fixed check valve, the design of check valve on valve, air inlet and gas outlet, and solenoid valve is then convenient for Air pressure in smoke discharging pipe 1 is detected, if air pressure is larger in smoke discharging pipe 1, solenoid valve is opened, and then flue gas enters back In flow tube, then flue gas returns to initial position, and then mixes again, guarantees the stabilization of air pressure in smoke discharging pipe 1.

Catalytic plate 44 is equipped with three pieces, and three pieces of catalytic plates 44 are sleeved in 45 annular side of fixed link, three pieces of catalytic plates 44 Design then improve catalytic effect.

Vortex mixing plate 2 uses round or ellipse plate, and setting angle and horizontal direction are in -70 ° ~ 70 °.

Processing anti-skid chequer at the top of 45 annular side of fixed link, the 43 tapered structure in annular side lower part of tank body, anti-skid chequer Then convenient for holding to fixed link 45, the design of the tapered structure of tank body 43 is then convenient for grid 48 into placement for design.

Concepts described herein may be embodied to other forms without departing from its spirit and characteristics.It is disclosed The specific embodiments are to be considered as illustrative and not restrictive.Therefore, the scope of the utility model is by appended right It is required that instead of making decisions based on these previous descriptions.Within the literal meaning and equivalent scope of the claims any Change all should belong to these the scope of the claims.

Claims (5)

1.SCR denitrification reducing agent mixing arrangement, including smoke discharging pipe, it is characterised in that: whirlpool is placed in bottom in the smoke discharging pipe Mixed plate is flowed, the vortex mixing plate right end is fixedly connected by bracket with jet pipe, and the jet pipe is arranged on vortex mixing plate Side, the jet pipe right end stretch out on the right side of smoke discharging pipe, and the smoke discharging pipe lower end is fixedly connected with shield, and the shield lower end is logical Bolt is crossed to be fixedly connected with disassembly mechanism；The disassembly mechanism includes movable pulley, supporting leg, tank body, catalytic plate, fixed link, O-shaped Circle, position-limiting tube and grid, the movable pulley are fixed on supporting leg lower end surface, and the supporting leg is bolted on tank body ring Shape side lower end, grid is placed in lower part in the tank body, and grid upper end middle position connects by the way that bolt and fixed link are fixed It connects, the fixed link annular side suit position-limiting tube, O-ring and catalytic plate, the tank body upper end can by bolt and shield Dismantling connection, the O-ring are arranged in catalytic plate upper and lower ends.

2. SCR denitration reducing agent mixing arrangement according to claim 1, it is characterised in that: the smoke discharging pipe annular side Face lower right processes gas outlet, and gas outlet right end is connected with reflux line, smoke discharging pipe annular side upper end left part Processing gas inlet mouth, the reflux line other end are connected with air inlet, and solenoid valve, the air inlet are installed on the reflux line Fixed check valve on mouth and gas outlet.

3. SCR denitration reducing agent mixing arrangement according to claim 1, it is characterised in that: the catalytic plate is equipped with three pieces, Three pieces of catalytic plates are sleeved in fixed link annular side.

4. SCR denitration reducing agent mixing arrangement according to claim 1, it is characterised in that: the vortex mixing plate uses Round or ellipse plate, setting angle and horizontal direction are in -70 ° ~ 70 °.

5. SCR denitration reducing agent mixing arrangement according to claim 1, it is characterised in that: the fixed link annular side Top processes anti-skid chequer, the tapered structure in tank body annular side lower part.