CN207533054U - A kind of SCR reaction units for the processing of cement clinker production line kiln exit gas - Google Patents

Abstract

The utility model discloses a kind of SCR reaction units for the processing of cement clinker production line kiln exit gas, including SCR reactors, set on SCR reactor heads and vertically arranged gas approach, further include：Ammonia evaporator in gas approach；Ammonia/flue gas mixer, include the cylinder of horizontal setting, cylinder one end carries the first interface as gas inlet, the other end carries the second interface as mixed gas outlet, the third interface with connection vaporization ammonium hydroxide mixed gas outlet on barrel, and the perforated pipe being connect with third interface and at least one piece of uniform flow orifice positioned at perforated pipe downstream are equipped in cylinder；Ammonia injector, in gas approach and positioned at ammonia evaporator downstream, second interface is accessed in the ammonia injector.The utility model realizes that the ammonium hydroxide of SCR denitration section evaporates using preheater downstream medium temperature flue gas, it is sent into SCR reactors with after being mixed from kiln tail chimney via the low-temperature flue gas that dilution air is introduced into, the energy-efficient of SCR denitration is realized, applied in cement clinker production line.

Description

A kind of SCR reaction units for the processing of cement clinker production line kiln exit gas

Technical field

To be fume treatment technical field the utility model is related to cement clinker production line, and in particular to one kind is used for cement The SCR reaction units of clinker production line kiln exit gas processing.

Background technology

SCR gas denitrifying technologies refer to spray into reducing agent in suitable temperature window, the nitrogen oxides in flue gas and also Former agent under the effect of the catalyst, is selectively reduced to the water and nitrogen being safe from harm, and is domestic and international cement furnace, thermoelectricity pot Utilization in stove, coal-fired plant flue gas denitration engineering the most extensively, the technology that denitration rate is high, system is reliable and stable.

Currently for coal-burning boiler, with the propulsion of minimum discharge technology, SCR denitration technology is its mainstream technology, but more Using liquefied ammonia as reducing agent, liquefied ammonia evaporation and spraying technique are the system independently of flue, and more mature；For thermoelectricity pot Stove uses SNCR denitration technology since early stage is more, and due to the promotion of standard, simple SNCR denitration cannot be met the requirements, SNCR-SCR combined denitrations and simple SCR denitration technology mature, for clinker line, due to standard relative loose, SNCR is current mainstream technology, using ammonium hydroxide as reducing agent.For the demand of in-depth research, it is proposed that further in end Couple the technology of SCR denitration.

Although SCR denitration technology is ripe, cement industry there is no application at home, need not using the SCR technology of ammonium hydroxide In addition configuration liquefied ammonia system, safety convenience can greatly promote, it is necessary to seek to meet the energy-efficient of SCR denitration Ammonium hydroxide evaporation technique.

Utility model content

The utility model provides a kind of SCR reaction units for the processing of cement clinker production line kiln exit gas, using pre- The ammonium hydroxide evaporation of hot (340-360 DEG C) realization SCR denitration section of device downstream medium temperature flue gas, with drawing from kiln tail chimney via dilution air It is sent into SCR reactors after (90-110 DEG C) mixing of the low-temperature flue gas entered, the energy-efficient of SCR denitration is realized, applied to cement In clinker production line.

A kind of SCR reaction units for the processing of cement clinker production line kiln exit gas, including SCR reactors, set on SCR Reactor head and vertically arranged gas approach and the exhaust pass positioned at SCR reactor bottoms, further include：

Ammonia evaporator, including being set on the coil pipe or tubulation that are flowed through in the gas approach for ammonium hydroxide, the coil pipe or tubulation Ammonium hydroxide import run through gas approach wall through gas approach wall connection ammonium hydroxide feeding pipe, vaporization ammonium hydroxide mixed gas outlet；

Ammonia/flue gas mixer, includes the cylinder of horizontal setting, cylinder one end carry the first interface as gas inlet, The other end carries the second interface as mixed gas outlet, the third with the connection vaporization ammonium hydroxide mixed gas outlet on barrel Interface, cylinder is interior to be equipped with the perforated pipe being connect with the third interface and at least one piece of equal discharge orifice positioned at perforated pipe downstream Plate；

Ammonia injector, in gas approach and positioned at ammonia evaporator downstream, the second interface accesses the ammonia injector In.

Coil pipe/tubulation structure is the main equipment of ammonia evaporator, is arranged in inside SCR reactor inlet flues, ammonium hydroxide is walked Ammonium hydroxide inside coil pipe/tubulation is heated to vaporized state by tube side by external 320-360 DEG C of section flue gas.

Preferably, it is respectively provided with pressure gauge at the ammonium hydroxide entrance of the ammonia evaporator and vaporization ammonium hydroxide mixed gas outlet.

Further preferably, the ammonium hydroxide import of the coil pipe or tubulation connects the second pipeline section, ammonia vaporised through gas approach wall Water mixed gas outlet connects third pipeline section through gas approach wall, and second pipeline section connects the first pipeline section by diffuser, Second pipeline section is connected with the flared end of diffuser, and the first pipeline section connects the ammonium hydroxide feeding pipe, and the pressure gauge is set respectively On the first pipeline section and third pipeline section.

It is further preferred that first pipeline section is equipped with check-valves, the third pipeline section is equipped with unrestrained pipe and puts Flow valve.

Horizontal tubulation can be used in the tubulation, and vertical tubulation can also be used, it is preferable that the tubulation includes several mutually flat Row and the horizontal pipe section arranged along gas approach axis, are connected by curved pipe between adjacent level pipeline section.

Ammonium hydroxide upper entering and lower leaving in coil pipe or tubulation；It is flanged joint at ammonium hydroxide entrance and air water mixed export.Just In the installation and removal of flue inside and outside equipment.

The caliber of first pipeline section and pipe fitting is determined with ensureing that ammonia flow rate 2-3m/s is calculated；The coil pipe or tubulation Caliber is gasified totally with to ensure ammonium hydroxide and is heated to flow velocity after flue temperature and calculates in 15-15m/s to determine.

First pipeline section is ammonium hydroxide conveyance conduit Butt Section, and excessive formed of pressure is flowed back after check-valves avoids ammonium hydroxide gasification, pressure Power table can be used for judging whether operating status is normal, and diffuser is used to meet volume enlargement pressure balance after ammonium hydroxide gasification, Unrestrained pipe and release valve discharge waste liquid for malfunction.

Ammonia/flue gas mixer is sent into for the mixed gas after ammonium hydroxide gasification and the mixing of flue gas, flue gas by first interface In cylinder, the mixed gas after ammonium hydroxide gasification is sent by third interface, perforated pipe in cylinder, is mixed with flue gas, is further existed Uniform flow orifice effect is lower to be uniformly mixed, and is finally exported, is sprayed into gas approach by second interface.

First interface, second interface are flange-interface, realize the introducing of flue gas and the export of ammonia/flue gas mixed gas, just It is repaired in installation and removal；Third interface is flange-interface, is easily installed and detachable maintaining, realizes the gaseous mixture after ammonium hydroxide gasification The introducing of body.

Preferably, it is connected between the first interface and cylinder by diffuser, is passed through between the cylinder and second interface Reducing pipe is connected.

Diffuser is ascending reducing pipe structure, and microcephaly is consistent with first interface flange specification, and major part is with mixing Jun Liu areas caliber is consistent, for flue gas to be imported mixing/Jun Liuqu；Reducing pipe is by greatly to small reducing pipe structure, shape Looks feature is consistent with diffuser, the cylinder connector other end is mounted on into minute surface, for exporting finely dispersed ammonia/flue gas gaseous mixture Body.

Preferably, the third interface is located on the barrel of top, axis and the perpendicular cloth of tubular axis of the perforated pipe It puts.

It is further preferred that perforated pipe stretch into spacing between one end in cylinder and cylinder inner surface for 50~ 150mm.Most preferably 100mm.

In cylinder top drilling, and perforated pipe is installed, cylinder exterior tube segment length 350mm, sectional configurations flange, as third Interface；Inner barrel pipeline section is deep into along conduit axis direction at the 100mm of inner barrel surface, and end face is not sealed, on pipeline uniformly Trepanning；Mixed gas after outside is gasified by pipeline with ammonium hydroxide is docked, and ammonia is distributed to mixed zone by inner perforated pipe, is realized It is mixed with the first time of flue gas.

Preferably, the uniform flow orifice includes the first uniform flow orifice and the second equal discharge orifice that are set gradually along flue gas flow direction Plate, region between the first uniform flow orifice and first interface are mixed zone, and the region between two pieces of uniform flow orifices is flowed for first Area, the region between the second uniform flow orifice and second interface are the second Jun Liu areas.

It is further preferred that the first Jun Liu areas and the length of the second Jun Liu areas along cylinder axial direction are uniform flow orifice diameter 1.5-2 again.

It is further preferred that first uniform flow orifice and the second uniform flow orifice are apertured disc structure, percent opening is 20-30%.

Cylinder be horizontal cylinder structure, air speed 15-20m/s；Percent opening 20%-30%, annular in shape uniformly distributed, via rate is not Less than 50m/s.

First third interface ammonia access conduit caliber is determined according to ammonia expense；Then it is less than according to control ammonia density 5vol% determines the exhaust gas volumn for needing to introduce, and determines first interface caliber；Again cylinder pipe is determined according to ammonia and the total tolerance of flue gas Diameter.

Preferably, first interface, second interface, third interface external connection pipeline are respectively provided with thermometer, ensure temperature Higher than 100 DEG C.

Preferably, the ammonia injector is made of main pipe and branch pipe, on branch pipe trepanning be as nozzle, nozzle bore size 3-5mm, trepanning number with ensure single hole spray air velocity be not less than 100m/s.

Ammonia evaporator is exported to ammonia/flue gas mixer pipe-line system, ammonia/flue gas compounder systems, ammonia/flue gas hybrid system Setting heat preservation is both needed to ammonia spraying system main pipe, kiln tail flue gas system, using rock wool+galvanized iron sheet, ensures temperature outside insulating layer Degree is less than 50 DEG C.

The utility model arranges ammonia evaporator in clinker line SCR reactor inlet flues, using in gas approach Ammonium hydroxide in coil pipe is heated to vaporized state by the flue gas that portion's temperature is about 320-360 DEG C, then introduce ammonia/flue gas mixer with Flue gas from kiln tail chimney mixes, and the flue gas introduced in ammonia/flue gas mixer is the clean flue gas of kiln tail chimney, in solving When state's cement furnace SCR denitration uses ammonium hydroxide as reducing agent, after ammonium hydroxide evaporation gasification, give according to low temperature dilution wind dilute It releases, the problem of temperature drop causes to be returned to liquid water.

Compared with prior art, the utility model has the advantages that：

(1) compared to ammonium hydroxide directly is sprayed into SCR reactor inlet flues, it will be sprayed into after ammonium hydroxide evaporation gasification, ensure spray The ammonia distribution for entering flue is more uniform, meets the flow field needed for SCR denitration and is evenly distributed with property requirement, on the other hand sprays into vapor phase ammonia than spray Reaction rate can be promoted by entering ammonium hydroxide；

(3) vapor phase ammonia is sent into ammonia/flue gas mixer, passes through the diluting effect of flue gas, it is ensured that vapor phase ammonia in system Concentration is in lower explosive limit hereinafter, improving the safety of denitrating system；

(4) ammonium hydroxide is made to volatilize using the heat of flue gas in itself, without additionally increasing heat source, reduces equipment redundancy and energy Consumption.

Description of the drawings

Fig. 1 is the structure diagram of the utility model SCR reaction units.

Fig. 2 is a kind of the utility model ammonia steaming device embodiment (tubulation) structure diagram.

Fig. 3 is a kind of the utility model ammonia steaming device embodiment (coil pipe) structure diagram.

Fig. 4 is the structure diagram of the utility model ammonia/flue gas mixer.

Fig. 5 is uniform flow orifice structure diagram.

Reference numeral is as follows shown in figure：

1-SCR reactor 2- gas approach 3- ammonia evaporators

4- ammonia injector 5- ammonia/flue gas mixer

31- the first pipeline section 32- check-valves 33- pressure gauges

34- diffusers 35- the second pipeline section 36- ammonium hydroxide inlet interfaces

37- tubulations 38- vaporization ammonium hydroxide gaseous mixtures go out the unrestrained pipes of 39- and drain valve

Mouth interface

310- third pipeline section 311- coil pipes

51- first interface 52- flaring connection tube 53- third interfaces

54- perforated pipes 55- the first uniform flow orifice the second uniform flow orifices of 56-

The tapered connection tube 58- second interfaces 59- mixed zones of 57-

510- the first Jun Liu the second Jun Liu of area 511- areas 512- cylinders

Specific embodiment

As shown in Figure 1, a kind of-SCR reaction units applied to the processing of cement furnace kiln exit gas, including SCR reactors 1, which uses conventional scr reactor, SCR reactor heads connection gas approach 2, and gas approach 2 selects 320-360 DEG C of model Interior vertical flue is enclosed, top is connected with preheater exhaust pass, bottom is connected with SCR reactor smoke inlets, gas approach Interior suitable flue gas flow direction sets gradually ammonia evaporator 3 and ammonia injector 4, and ammonia/flue gas mixer 5, ammonia/cigarette are set outside gas approach The air inlet of gas mixer 5 is connected by flue with kiln tail chimney, vaporizes ammonium hydroxide mixed gas outlet is connected with ammonia injector 4, ammonia Import is connected with the outlet of ammonia evaporator 3.

The structure of ammonia evaporator 3 as shown in Figures 2 and 3, vaporizer body be tubulation 37 (Fig. 2) or coil pipe 311 (Fig. 3), Tubulation is made of several horizontal pipe sections being mutually parallel, and is arranged along the axis of flue, passes through the 4th between adjacent level pipeline section Pipeline section and the linking of arc pipeline section.

Positioned at horizontal pipe section one end port of top layer through walling of flue with ammonium hydroxide inlet interface 36, which is method Orchid, by one section of second pipeline section 35 of flanged joint, the second pipeline section 35 is connect by one section of diffuser 34 with the first pipeline section 31, and second The flared end of pipeline section and diffuser connects, and flow direction sets gradually check-valves 32 and pressure gauge 33 downstream on the first pipeline section 34；It is located at For lowest level horizontal pipe section Single port through walling of flue with vaporization ammonium hydroxide mixed gas outlet interface 38, which is flange, is passed through One section of third pipeline section 310 of flanged joint sets unrestrained pipe and drain valve 39 on third pipeline section 310.

In present embodiment, the first pipeline section is realized to be docked with ammonium hydroxide transport system, first pipeline section 31 and pipe fitting its caliber It is determined according to ammonia flow rate 2-3m/s, the second pipeline section and pipe fitting, caliber are consistent with tubulation, and tubulation caliber is complete according to ammonium hydroxide It is complete to gasify and be heated to flue temperature (320-360 DEG C) flow velocity is calculated in 15-15m/s and determined afterwards, unrestrained pipe and drain valve 39 its Caliber and specification are consistent with third pipeline section, and third pipeline section pipeline and pipe fitting its caliber are consistent with tubulation.To ensure to manage The air-tightness of section, in addition to valve, is connected using welding manner.

Ammonium hydroxide walks tube side in tubulation, and upper entering and lower leaving, flue gas flow direction is straight down, makes by the temperature of flue gas in tube side Ammonium hydroxide flashes to gaseous state.

As shown in figure 4, the main body pipeline section in flue is substituted for coil pipe when vaporizer body structure uses coil pipe 311, vaporization ammonium hydroxide mixed gas outlet interface 38 connects the pipeline section of the calibers such as one section and outlet, then is connected by one section of diffuser The third pipeline section 310 of Large Diameter Pipeline, unrestrained pipe and drain valve 39 are provided on the pipeline section of the calibers such as outlet, and pressure gauge is arranged on On the third pipeline section of Large Diameter Pipeline, other are set in Fig. 2 unanimously.

As shown in Figure 4 and Figure 5, including horizontal cylinder 512, one end of cylinder 512 is set the structure of ammonia/flue gas mixer 5 First interface 51, other end setting second interface 58 are put, is connected between first interface and cylinder by flaring connection tube 52, cylinder It is connected between second interface 58 by tapered connection tube 57, is flange at first interface and second interface, first interface is made For gas inlet, connect from the flue from kiln tail chimney, second interface is as mixed gas outlet, mixed gas outlet connection ammonia Injector 4.

Two pieces of uniform flow orifices (the first uniform flow orifice 55 and the second uniform flow orifice 56) are set along flue gas flow direction in cylinder 512, The plate face of two uniform flow orifice and the axial direction of cylinder perpendicular arrangement are mixed zone between diffuser flaring and the first uniform flow orifice 59th, it is the first Jun Liu areas 510 between the first uniform flow orifice 55 and the second uniform flow orifice 56, the second uniform flow orifice 56 expands with reducing pipe It is the second Jun Liu areas 511 between mouthful, the trizonal length ratio along tubular axis substantially 1.3~1.4:1.3~1.4: 1。

The top tube wall opening of mixed zone, perforated pipe 54 are inserted vertically into mixed zone, i.e. the axis of perforated pipe and cylinder Axis perpendicular, perforation bottom of the tube are not closed, and the spacing between the barrel of mixed zone bottom is 100mm, and perforated pipe is closed upper equal Even trepanning, for that will gasify, ammonium hydroxide is uniformly sent into mixed zone.Perforated pipe is located at external long 350mm of pipeline section or so, and port is Third interface 53, third interface set flange, connect the vaporization ammonium hydroxide mixed gas outlet interface 38 of ammonia evaporator.Perforated pipe leans on It is set at the flaring of nearly diffuser.

For two pieces of uniform flow orifices as shown in figure 5, for circular orifice, circumference is in the connection of barrel inner wall sealing.

Ammonia injector is made of main pipe and branch pipe, and trepanning is as nozzle on branch pipe, and nozzle bore size is 3-5mm, trepanning Number with ensure single hole injection air velocity be not less than 100m/s.

First interface 51 is docked with 100-150 DEG C of the flue quoted from kiln tail chimney, is sent into through flaring connection tube 52 To mixed zone 59, the ammonium hydroxide (ammonia+vapor) through being gasified totally is introduced from third interface, mixed zone is distributed to from perforated pipe 54 59, ammonia is mixed for the first time with flue gas.Then, it is homogenized through the first uniform flow orifice 55, into the first Jun Liu areas 510, then passes through Second uniform flow orifice 56 be homogenized after enter the second Jun Liu areas 511, exported through tapered connection tube 53 and second interface 55, send to In ammonia injector 4.

Ammonium hydroxide is sent into via ammonia inlet in ammonia evaporator, the cigarette from preheater and temperature range in 320-360 DEG C Ammonium hydroxide is gasified totally by gas, and ammonia introduces the mixing of ammonia/flue gas wherein after gasification, with from kiln tail stack temperature in 100-150 DEG C of model Flue gas in enclosing mixes and is sent into ammonia injector, then sprayed into gas approach by ammonia injector after being diluted to setting concentration, in SCR Reactor catalysis reacts.

The foregoing is merely the specific implementation case of the utility model patent, but the technical characteristic of the utility model patent is simultaneously Not limited to this, any those skilled in the relevant art in the field of the utility model, all cover by the variation or modification made Among the scope of the claims of the utility model.

Claims (9)

1. a kind of SCR reaction units for the processing of cement clinker production line kiln exit gas, including SCR reactors, anti-set on SCR It answers at the top of device and vertically arranged gas approach and the exhaust pass positioned at SCR reactor bottoms, which is characterized in that also wrap It includes：

Ammonia evaporator, the ammonia including being set on the coil pipe or tubulation that are flowed through in the gas approach for ammonium hydroxide, the coil pipe or tubulation Water inlet runs through gas approach wall through gas approach wall connection ammonium hydroxide feeding pipe, vaporization ammonium hydroxide mixed gas outlet；

Ammonia/flue gas mixer, includes the cylinder of horizontal setting, and cylinder one end carries the first interface as gas inlet, another End carries the second interface as mixed gas outlet, is connect on barrel with the third for connecting the vaporization ammonium hydroxide mixed gas outlet Mouthful, the perforated pipe being connect with the third interface and at least one piece of uniform flow orifice positioned at perforated pipe downstream are equipped in cylinder；

Ammonia injector, in gas approach and positioned at ammonia evaporator downstream, the second interface is accessed in the ammonia injector.

2. SCR reaction units according to claim 1, which is characterized in that the ammonium hydroxide entrance of the ammonia evaporator and vaporization Pressure gauge is respectively provided at ammonium hydroxide mixed gas outlet.

3. SCR reaction units according to claim 2, which is characterized in that the ammonium hydroxide import of the coil pipe or tubulation run through into Mouth walling of flue connects the second pipeline section, the outlet of ammonia vaporised water mixed gas runs through gas approach wall connection third pipeline section, and described second Pipeline section connects the first pipeline section by diffuser, and the second pipeline section is connected with the flared end of diffuser, and the first pipeline section connects the ammonium hydroxide Feeding pipe, the pressure gauge are separately positioned on the first pipeline section and third pipeline section.

4. SCR reaction units according to claim 3, which is characterized in that first pipeline section is equipped with check-valves, and described the Three pipeline sections are equipped with unrestrained pipe and release valve.

5. SCR reaction units according to claim 1, which is characterized in that the third interface is located on the barrel of top, described The axis of perforated pipe and the perpendicular arrangement of tubular axis.

6. SCR reaction units according to claim 5, which is characterized in that perforated pipe is stretched into one end and cylinder in cylinder Spacing between surface is 50~150mm.

7. SCR reaction units according to claim 1, which is characterized in that the uniform flow orifice is included along flue gas flow direction successively The first uniform flow orifice and the second uniform flow orifice of setting, region between the first uniform flow orifice and first interface are mixed zone, two Region between block uniform flow orifice is the first Jun Liu areas, and the region between the second uniform flow orifice and second interface is flowed for second Area.

8. SCR reaction units according to claim 7, which is characterized in that the first Jun Liu areas and the second Jun Liu areas are along drum shaft To length be 1.5-2 times of uniform flow orifice diameter.

9. SCR reaction units according to claim 1, which is characterized in that the ammonia injector is made of main pipe and branch pipe, branch Trepanning is as nozzle on pipe, and nozzle bore size is 3-5mm, and trepanning number is to ensure that the air velocity that single hole sprays is not less than 100m/s。