CN206474017U - A kind of multiple pass type selective catalytic reduction denitration device - Google Patents
A kind of multiple pass type selective catalytic reduction denitration device Download PDFInfo
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- CN206474017U CN206474017U CN201720057982.7U CN201720057982U CN206474017U CN 206474017 U CN206474017 U CN 206474017U CN 201720057982 U CN201720057982 U CN 201720057982U CN 206474017 U CN206474017 U CN 206474017U
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- catalyst
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- 238000010531 catalytic reduction reaction Methods 0.000 title claims abstract description 20
- 239000003054 catalyst Substances 0.000 claims abstract description 180
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 144
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 107
- 239000003546 flue gas Substances 0.000 claims abstract description 107
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 71
- 239000007921 spray Substances 0.000 claims abstract description 28
- 239000000428 dust Substances 0.000 claims abstract description 21
- 230000007306 turnover Effects 0.000 claims abstract description 19
- 238000005507 spraying Methods 0.000 claims description 60
- 239000000779 smoke Substances 0.000 claims description 45
- XBSSFZDUEZSINP-UHFFFAOYSA-N N.[N]=O.[O] Chemical compound N.[N]=O.[O] XBSSFZDUEZSINP-UHFFFAOYSA-N 0.000 claims description 20
- 230000007246 mechanism Effects 0.000 claims description 17
- 239000004071 soot Substances 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000035939 shock Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 35
- 239000007789 gas Substances 0.000 abstract description 9
- 235000019504 cigarettes Nutrition 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- GWFXMCXJFOEMNQ-UHFFFAOYSA-N [O].O=[N] Chemical class [O].O=[N] GWFXMCXJFOEMNQ-UHFFFAOYSA-N 0.000 abstract 2
- 239000002956 ash Substances 0.000 description 33
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 27
- 239000010881 fly ash Substances 0.000 description 13
- 239000003638 chemical reducing agent Substances 0.000 description 12
- 230000008021 deposition Effects 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000003916 acid precipitation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000012429 reaction media Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 206010014561 Emphysema Diseases 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 206010022000 influenza Diseases 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
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- 231100000331 toxic Toxicity 0.000 description 1
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- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses a kind of multiple pass type selective catalytic reduction denitration device, it is outside to assemble sandwich type element, and housing is interior to be divided into first, second, third journey flue according to flue gas trend；Cigarette receiving gas inlet pipe at the top of first journey flue, top and bottom are respectively equipped with flue gas heater, and middle part sets spray ammonia pipe network；Middle and lower part sets temperature sensor and oxygen nitrogen oxides ammonia concentration integrated sensor；Set in second, third journey flue below arrangement catalyst block, catalyst block and set dust remover above flue gas cowling panel, every group of catalyst block, flue inner top sets temperature sensor, side wall and sets differential pressure pickup, and each journey flue is all provided with manhole access door and ash removing opening；Separated between flue with dividing plate and electric turnover door；First journey flue bottom, the second journey flue and the 3rd journey flue top connect set oxygen nitrogen oxides ammonia concentration integrated sensor in the bypass pipe for installing motor-driven valve, flue gas outlet pipe respectively.The device reaction efficiency high, catalyst service life length and repair and maintenance are easy.
Description
Technical Field
The utility model relates to a electricity generation and environmental protection field especially relate to a multiple pass formula selective catalytic reduction denitrification facility.
Background
A large amount of toxic and harmful gases are generated in the burning process of coal and household garbage, and nitrogen oxides are paid much attention due to high harmfulness and high disposal difficulty. NOxAcid rain is caused in the atmosphere and is a precursor of photochemical smog, and when the acid rain directly acts on a human body, the acid rain can damage a respiratory system and can cause bronchitis and emphysema.
Aiming at the control of nitrogen oxides, low-nitrogen combustion, fuel staged combustion, flue gas recirculation, a selective/non-selective catalytic reduction method and the like exist at present, wherein the selective catalytic reduction method is a widely accepted treatment method in the field of flue gas denitration, and the denitration efficiency can reach more than 90%.
The control of our country to nitrogen oxide emission starts late, and selective catalytic reduction denitrification facility structure is single, generally sets up the reductant spout in the flue that connects before the denitrification facility, and the denitrification facility is for setting up the vertical cylinder structure of multilayer catalyst, the main problem that exists in the application: 1) the reducing agent and the flue gas are not uniformly mixed; 2) the reaction temperature fluctuation is large, and the catalyst is invalid due to the fact that the temperature does not meet the requirement; 3) the catalyst has serious ash deposition and large system resistance; 4) the catalyst is frequently replaced, and the operation cost is high; 5) incomplete reaction, high content of nitrogen oxides and high escape amount of ammonia; 6) the maintenance difficulty is large and the time is long.
SUMMERY OF THE UTILITY MODEL
Based on the problem that prior art exists, the utility model aims at providing a multipass formula selective catalytic reduction denitrification facility, its reaction efficiency is high, catalyst long service life and maintenance are easy.
The utility model aims at realizing through the following technical scheme:
the embodiment of the utility model provides a multi-pass selective catalytic reduction denitration device, the device is externally provided with an assembled shell, a first pass flue, a second pass flue and a third pass flue are vertically arranged in the assembled shell in parallel, and the top of the first pass flue is provided with a flue gas inlet pipe; a smoke outlet pipe is arranged at the bottom of the third pass flue;
the first pass flue and the second pass flue are separated by a first heat conduction baffle, the bottom in the first pass flue is communicated with the bottom in the second pass flue, and a first electric turnover door is arranged at the communication position;
the second pass flue and the third pass flue are separated by a second heat conduction baffle, the inner top of the second pass flue is communicated with the inner top of the third pass flue, and a second electric turnover door is arranged at the communication position;
the first pass flue, the second pass flue and the third pass flue are communicated to form a transverse S-shaped flue gas channel connected between the flue gas inlet pipe and the flue gas outlet pipe;
a first bypass smoke outlet pipe is arranged at the bottom of the first pass flue, a first bypass electric valve is arranged on the first bypass smoke outlet pipe, and the first bypass smoke outlet pipe is connected to the smoke outlet pipe through a first bypass pipe;
a second bypass smoke outlet pipe is arranged at the top of the second pass flue, a second bypass electric valve is arranged on the second bypass smoke outlet pipe, a third bypass smoke outlet pipe is arranged at the top of the third pass flue, a third bypass electric valve is arranged on the third bypass smoke outlet pipe, and the second bypass smoke outlet pipe and the third bypass smoke outlet pipe are both connected to the smoke outlet pipe through a second bypass pipe;
an ammonia spraying pipe network is arranged in the middle of the first pass flue, a dust remover is arranged on the ammonia spraying pipe network, and a first temperature sensor and a first oxygen-nitrogen oxide-ammonia concentration integrated sensor are respectively arranged at the middle lower part of the first pass flue;
two groups of first catalyst blocks are arranged in the second-pass flue, the two groups of first catalyst blocks are arranged in the second-pass flue through a first position adjusting mechanism, a first flue gas rectifying plate is arranged below the two groups of first catalyst blocks, and an ash cleaner is arranged above each group of first catalyst blocks; a first catalyst test block is arranged between the two groups of first catalyst blocks; a first differential pressure sensor is arranged in the second pass flue, a second temperature sensor is arranged at the bottom in the second pass flue, and a third temperature sensor is arranged at the top in the second pass flue;
two groups of second catalyst blocks are arranged in the third-pass flue, the two groups of second catalyst blocks are arranged in the third-pass flue through a second position adjusting mechanism, a second flue gas rectifying plate is arranged above the two groups of second catalyst blocks, and a dust remover is arranged above each group of second catalyst blocks; a second catalyst test block is arranged between the two groups of second catalyst blocks; a second differential pressure sensor is arranged in the third pass flue, a fourth temperature sensor is arranged at the inner top of the third pass flue, and a fifth temperature sensor is arranged at the inner bottom of the third pass flue;
a second oxygen-nitrogen oxide-ammonia concentration integrated sensor is arranged on the flue gas outlet pipe;
the main control device is respectively electrically connected with each temperature sensor, each oxygen-nitrogen oxide-ammonia concentration integrated sensor, each bypass electric valve, each electric turnover door and each ash remover, obtains signals of each temperature sensor and each oxygen-nitrogen oxide-ammonia concentration integrated sensor, and controls each bypass electric valve, each electric turnover door and each ash remover according to the signals; the main control device is connected with a central control system of the incineration workshop, receives starting and emergency stopping commands of the central control system, and synchronously uploads running state parameter signals of all key components to the central control system.
By the foregoing the utility model provides a technical scheme can see out, the embodiment of the utility model provides a denitrification facility, its beneficial effect is:
1) the reducing agent and the flue gas are mixed and react more fully, the reducing agent is sprayed from an ammonia spraying pipe network of the first pass flue, turbulence is formed in the first pass flue, and the ammonia gas and the nitrogen oxide are mixed more uniformly; the rectifying plates are arranged before the flue gas enters the second-pass flue and the third-pass flue, so that the mixed gas is uniformly distributed, and the reaction condition of the mixed gas is more stable.
2) The fluctuation of the reaction temperature is small, the reaction conditions are more reliable, the flue gas heater inputs heat in the first pass flue, and the heat conduction baffle between the passes in the device guides the flue gas but does not insulate heat, so that the device can more effectively utilize the heat input by the flue gas heater; the temperature sensors at all parts in the device collect temperature signals and control the input heat of the flue gas heater, thereby maintaining the reaction temperature in a stable range.
3) The catalyst has less accumulated ash, the replacement frequency is greatly reduced, the smoke path of the smoke in the device is long, the flow rate is relatively low, the deposition of fly ash in the smoke is convenient, the smoke path of the smoke is not a single straight-up or straight-down type of the traditional device, but a transverse S-shaped smoke path, and the bottom of a three-path flue is provided with an ash accumulation port, so that the ash is convenient to clean; the rectifying plate can intercept fly ash from entering the catalyst before the flue gas enters the catalyst; the ash cleaner is arranged above each group of catalysts, the ash cleaner can be controlled periodically or in a pressure difference linkage manner, the ash deposition on the catalysts is greatly reduced, and the service life of the catalysts is prolonged.
4) The denitration reaction is complete, the reactants provided by the device are fully mixed, the reaction temperature fluctuation is small, and the reaction residence time is sufficient, so that the denitration reaction in the device is complete; furthermore, the middle and lower parts of the first-pass flue and the flue gas outlet flue are provided with a first oxygen-nitrogen oxide-ammonia concentration integrated sensor and a second oxygen-nitrogen oxide-ammonia concentration integrated sensor, so that whether the outlet oxygen, nitrogen oxide and ammonia content reach the standard or not is monitored in real time, and the ammonia spraying amount is controlled in a lock-connected mode, so that the content of nitrogen oxide and the ammonia escape amount in the outlet flue gas are reduced, and the denitration reaction efficiency is high.
5) The device is assembled shell structure, and two sets of first catalyst pieces are installed in the second journey flue through first position adjustment mechanism, and two sets of second catalyst pieces are installed in the third journey flue through second position adjustment mechanism, and correspond first, the casing of second catalyst piece mounted position and establish detachable flange, have made things convenient for catalyst piece's position adjustment and change.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a multi-pass selective catalytic reduction denitration device provided by an embodiment of the present invention;
fig. 2 is a top view of a circular ammonia injection pipe network according to an embodiment of the present invention;
FIG. 3 is a top view of a square ammonia injection pipe network according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an edge portion of a first catalyst block in a second pass flue according to an embodiment of the present invention;
FIG. 5 is a sectional view taken along line A-A of FIG. 3;
fig. 6 is a schematic view of a sliding groove of a lifting horizontal beam of the denitration device provided by the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the specific contents of the present invention, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiment of the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a multi-pass selective catalytic reduction denitration device, wherein an assembled structural casing is arranged outside the device, a first pass flue, a second pass flue and a third pass flue are vertically arranged in parallel in the assembled structural casing, and a flue gas inlet pipe is arranged at the top of the first pass flue; a flue gas outlet pipe is arranged at the bottom of the third pass flue;
the first pass flue and the second pass flue are separated by a first heat conduction baffle, the bottom in the first pass flue is communicated with the bottom in the second pass flue, and a first electric turnover door is arranged at the communication position;
the second pass flue and the third pass flue are separated by a second heat conduction baffle, the inner top of the second pass flue is communicated with the inner top of the third pass flue, and a second electric turnover door is arranged at the communication position;
the first pass flue, the second pass flue and the third pass flue are communicated to form a transverse S-shaped flue gas channel connected between the flue gas inlet pipe and the flue gas outlet pipe;
a first bypass smoke outlet pipe is arranged at the bottom of the first pass flue, a first bypass electric valve is arranged on the first bypass smoke outlet pipe, and the first bypass smoke outlet pipe is connected to a smoke outlet pipe through a first bypass pipe;
a second bypass smoke outlet pipe is arranged at the top of the second pass flue, a second bypass electric valve is arranged on the second bypass smoke outlet pipe, a third bypass smoke outlet pipe is arranged at the top of the third pass flue, a third bypass electric valve is arranged on the third bypass smoke outlet pipe, and the second bypass smoke outlet pipe and the third bypass smoke outlet pipe are both connected to a smoke outlet pipe through a second bypass pipe;
an ammonia spraying pipe network is arranged in the middle of the first pass flue, a soot cleaner is arranged on the ammonia spraying pipe network, and a first temperature sensor and a first oxygen-nitrogen oxide-ammonia concentration integrated sensor are respectively arranged at the middle lower part of the first pass flue;
two groups of first catalyst blocks are arranged in the second-pass flue, the two groups of first catalyst blocks are arranged in the second-pass flue through a first position adjusting mechanism, a first flue gas rectifying plate is arranged below the two groups of first catalyst blocks, and a dust remover is arranged above each group of first catalyst blocks; a first catalyst test block is arranged between the two groups of first catalyst blocks; a first differential pressure sensor is arranged in the second pass flue, a second temperature sensor is arranged at the bottom in the second pass flue, and a third temperature sensor is arranged at the top in the second pass flue;
two groups of second catalyst blocks are arranged in the third-pass flue, the two groups of second catalyst blocks are arranged in the third-pass flue through a second position adjusting mechanism, a second flue gas rectifying plate is arranged above the two groups of second catalyst blocks, and a dust remover is arranged above each group of second catalyst blocks; a second catalyst test block is arranged between the two groups of second catalyst blocks; a second differential pressure sensor is arranged in the third pass flue, a fourth temperature sensor is arranged at the inner top of the third pass flue, and a fifth temperature sensor is arranged at the inner bottom of the third pass flue;
a second oxygen-nitrogen oxide-ammonia concentration integrated sensor is arranged on the flue gas outlet pipe;
the main control device is respectively electrically connected with each temperature sensor, each oxygen-nitrogen oxide-ammonia concentration integrated sensor, each bypass electric valve, each electric turnover door and each ash remover, obtains signals of each temperature sensor and each oxygen-nitrogen oxide-ammonia concentration integrated sensor, and controls each bypass electric valve, each electric turnover door and each ash remover according to the signals; the main control device is connected with a central control system of the incineration workshop, receives starting and emergency stopping commands of the central control system, and synchronously uploads running state parameter signals of all key components to the central control system.
In the denitration device, the upper part and the lower part in the first pass flue are respectively provided with a dust removal net.
In the denitration device, the upper part and the lower part in the first pass flue are respectively provided with a flue gas heater, a compressed air type soot blower is arranged above or at the side of each flue gas heater, each flue gas heater and each compressed air type soot blower are respectively and electrically connected with a main control device, and the main control device controls the operation according to the command of a central control system. Preferably, the flue gas heater in the first pass flue adopts an indirect heater, and a steam heat exchange pipe, a steam heat exchange belt, an electric tracing belt or other equipment which can safely increase the temperature of the flue gas and does not influence the denitration reaction can be adopted.
Among the above-mentioned denitrification facility, the ammonia injection pipe network includes: the ammonia spraying device comprises an ammonia spraying main pipe, a plurality of ammonia spraying branch pipes, a plurality of spray gun heads and a dust cover; wherein,
the ammonia spraying main pipe is formed by connecting a main pipe with a plurality of annular pipes (as shown in figure 2, the annular pipes can be circular pipes, as shown in figure 3, the annular pipes can also be square annular pipes) which are different in diameter and are sleeved with each other, a plurality of ammonia spraying branch pipes are uniformly distributed on each annular pipe, each ammonia spraying branch pipe is vertically arranged to be vertical to the annular pipe of the ammonia spraying main pipe, the upper end of each ammonia spraying branch pipe is connected with each annular pipe, each ammonia spraying branch pipe is vertical to each annular pipe to form a downward-divergent tree-shaped structure, a plurality of spray gun heads facing a first-pass flue central shaft are distributed on each ammonia spraying branch pipe, and the main pipe is communicated with the spray gun heads through each annular pipe and each ammonia spraying branch pipe;
the spray gun heads of the ammonia spraying branch pipes on the most central annular pipe are the most, and the spray gun heads of the ammonia spraying branch pipes on the outer annular pipe from the center are sequentially decreased progressively; the spray gun heads between the adjacent ammonia spraying branch pipes are arranged in a staggered manner; the top of each spray gun head is provided with a dust cover;
the ash remover arranged on the ammonia spraying main pipe adopts a rapping ash remover.
In the above denitration device, the first position adjustment mechanism includes: at least two vertical supporting beams are arranged on the two side walls in the second pass flue, each vertical supporting beam is provided with a guide rail, a lifting horizontal beam is arranged in the guide rail on the two corresponding vertical supporting beams, the lifting horizontal beam is connected with a first driving device, each lifting horizontal beam is provided with a sliding groove (see figure 6), the sliding groove of each lifting horizontal beam is connected with the bottom of a group of first catalyst blocks, and the contact surface of each first catalyst block and the sliding groove is provided with an oil seal;
the first driving device is arranged on the vertical supporting beam of the second-stroke flue and is electrically connected with the main control device, and the driving end of the first driving device is connected with the lifting horizontal beam of the first position adjusting mechanism and can drive the lifting horizontal beam to lift on the vertical supporting beam according to the control of the main control device.
In the above denitration device, the second position adjustment mechanism includes: at least two vertical supporting beams are arranged on the two side walls in the third flue, each vertical supporting beam is provided with a guide rail, a lifting horizontal beam is arranged in the guide rail on the two corresponding vertical supporting beams, the lifting horizontal beams are connected with a second driving device, each lifting horizontal beam is provided with a sliding groove, the sliding groove of each lifting horizontal beam is connected with the bottom of a group of second catalyst blocks, and the contact surface of each second catalyst block and the sliding groove is provided with an oil seal;
the second driving device is arranged on the vertical supporting beam of the third-stroke flue and is electrically connected with the main control device, and the driving end of the second driving device is connected with the lifting horizontal beam of the second position adjusting mechanism and can drive the lifting horizontal beam to lift on the vertical supporting beam according to the control of the main control device.
The first driving device and the second driving device are made of high-temperature-resistant materials, and can be selected from chain type, steel belt type, lever type, gear type and the like, and corresponding air cooling or water cooling measures are arranged.
As shown in fig. 4 and 5, in the above denitration device, the outer layer of each group of first catalyst blocks is a high-density catalyst except the bottom, the surface of the high-density catalyst is a hardened shell, the hardened shell is wrapped by a metal mesh, low-density catalysts and medium-density catalysts which are arranged in a staggered manner are arranged in the high-density catalyst, and the volume of the medium-density catalyst is more than twice of the volume of the low-density catalyst.
In the denitration device, the outer layer of each group of second catalyst blocks is a high-density catalyst except the top, the surface of the high-density catalyst is a hardened shell, the hardened shell is wrapped by a metal net, low-density catalysts and medium-density catalysts which are arranged in a staggered mode are arranged in the high-density catalyst, and the volume of the medium-density catalyst is more than twice that of the low-density catalyst.
In the first and second catalyst blocks with the structure, the fly ash can be intercepted by the metal mesh wrapped outside the catalyst before the flue gas enters the catalyst; the medium-density and low-density catalysts in the catalyst block are staggered, and the mixed gas is easy to enter the low-density area and deposit fly ash in the low-density area, so that the main reaction area in the catalyst block is protected from being damaged. And the catalyst block with the structure is internally provided with three types of catalysts with low density and medium density, so that the full reaction of the reducing agent and the flue gas is more facilitated.
In the denitration device, the ash cleaners in the second-pass flue and the third-pass flue adopt a steam ash cleaner or a shock wave ash cleaner;
in the denitration device, a first manhole access door is arranged on the side wall of the first pass flue, and a first ash cleaning hole is arranged at the bottom of the first pass flue;
a second manhole access door is arranged on the side wall of the second pass flue, and a second ash cleaning hole is formed in the bottom of the second pass flue;
a third manhole access door is arranged on the side wall of the second pass flue, and a third dust removing hole is formed in the bottom of the second pass flue;
the observation holes are respectively arranged on the walls of the smoke channels, so that the operation condition of key equipment in the device can be observed conveniently.
Through setting up above-mentioned access door for the device overhauls the degree of difficulty little, sets up the deashing hole, makes things convenient for each journey flue deashing.
The installation positions of key components such as the catalyst block, the ammonia spraying pipe network and the like are assembled in a flange mode corresponding to the shell, so that the disassembly is convenient; supporting beams from top to bottom are arranged on two side walls of the catalyst, a lifting horizontal beam is arranged in the depth direction, and a sliding groove is formed in the horizontal beam and can pull the catalyst, so that the catalyst can be conveniently replaced when the catalyst fails; furthermore, each pass flue is provided with a bypass pipe and a control valve, so that the normal operation of the whole system is not influenced during equipment maintenance or catalyst replacement in the device.
The main control device in the denitration device adopts a programmable control system, the programmable control system displays and integrates the collected states and parameters of each bypass electric valve, each electric turnover door, each temperature sensor, each oxygen-nitrogen oxide-ammonia concentration integrated sensor, each soot blower, each soot cleaner and each position adjusting mechanism, logically calculates the injection amount of a reducing agent, the heating amount of flue gas, the soot cleaning period of an ammonia injection pipe network and a catalyst, controls the operation during the fault period and the like; the programmable control system uploads key signals of operation, faults and the like to a central control system of the incineration workshop, and receives and responds to starting and emergency stop commands of the central control system.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the exterior of the multi-pass selective catalytic reduction denitration device of the embodiment is an assembled shell 1, and the shell 1 is divided into a first-pass flue 2, a second-pass flue 3 and a third-pass flue 4 according to the trend of flue gas.
The top of the first pass flue 2 is connected with a flue gas inlet pipe 42; a flue gas heater 9a is arranged at the top and the middle lower part of the first pass flue 2; an ammonia spraying pipe network 11 is arranged in the middle of the first pass flue 2; a first temperature sensor 27 and a first oxygen-nitrogen oxide-ammonia concentration integrated sensor 32 are arranged below a flue gas heater 9a arranged at the middle lower part of the first pass flue 2; a manhole access door 13 is arranged on the side wall of the first pass flue 2, and an ash cleaning hole 14 is arranged at the bottom of the first pass flue; the first pass flue 2 and the second pass flue 3 are separated by a first heat conduction baffle 5 and a first electric turnover door 7. The middle lower part of the first pass flue 2 is connected with a first bypass pipe A, and a first bypass electric valve 23 is arranged on the first bypass pipe A.
The flue gas heater 9a in the first pass flue 2 preferably adopts an indirect heater, and can be a steam heat exchange pipe/belt, electric tracing or other equipment for safely increasing the flue gas temperature without influencing the denitration reaction. An ash cleaner is arranged above or on the side of the flue gas heater 9a, so that accumulated ash on the heat exchange surface of the heater can be periodically cleaned, and the heat exchange efficiency can be maintained and ensured.
An ammonia spraying pipe network 11 is arranged in the middle of the first pass flue 2, an ammonia spraying main pipe is composed of a main trunk pipe 111 and a plurality of connected annular pipes 112 in a multilayer annular structure (as shown in fig. 2, the annular pipes can be annular pipes, as shown in fig. 3, the annular pipes can also be square annular pipes), and each ammonia spraying branch pipe is downwards diffused and vertical to the main pipe to form a tree shape; spray gun heads facing the central axis of the first pass flue are uniformly arranged on the ammonia spraying branch pipes, the spray gun heads of the ammonia spraying branch pipes on the most central annular pipe are the most, and the spray gun heads on the ammonia spraying branch pipes from the center to the outer annular pipe are gradually decreased; the spray gun heads between the adjacent ammonia spraying branch pipes are arranged in a staggered manner; the top of the spray gun head is provided with a dust cover; the ammonia spraying mother pipe is provided with a rapping ash remover 12.
Catalyst blocks 22c are arranged in the second-pass flue 3, the corresponding shell 1 at the installation position of the catalyst blocks 22c is assembled by flanges, a first flue gas rectifying plate 19 is arranged below the catalyst blocks 22c of the second-pass flue 3, and an ash cleaner 21b is arranged above each group of catalyst blocks 22 c; a catalyst test block 36g is arranged between the two groups of catalyst blocks 22 c; a first differential pressure sensor 34 is arranged in the second pass flue 3, the pressure difference before and after the flue gas enters the catalyst is collected and uploaded, a second temperature sensor 28 is arranged at the bottom of the second pass flue, and a third temperature sensor 29 is arranged at the top of the second pass flue; a manhole access door 15 is arranged on the side wall of the second pass flue 3, and an ash cleaning hole 16 is arranged at the bottom of the second pass flue 3; the second pass flue 3 and the third pass flue 4 are separated by a second heat conduction baffle 6 and a second electric turnover door 8; the upper part of the second pass flue 3 is connected with a second bypass pipe B, and a second bypass electric valve 24 is arranged at the outlet.
A catalyst block 22d is arranged in the third pass flue 4, the corresponding shell 1 at the installation position of the catalyst block 22d is assembled in a flange mode, a second flue gas rectifying plate 20 is arranged above the catalyst block 22d of the third pass flue 4, and a dust remover 21b is arranged above each group of catalysts; a catalyst test block 36g is arranged between the two groups of catalyst blocks 22 d; a second differential pressure sensor 35 is arranged in the third-pass flue 4, the pressure difference before and after the flue gas enters the catalyst is collected and uploaded, a fourth temperature sensor 30 is arranged at the top of the third-pass flue 4, and a fifth temperature sensor 31 is arranged at the bottom of the third-pass flue 4; the upper part of the third pass flue 4 is connected with a second bypass pipe B, and a third bypass electric valve 25 is arranged at the outlet. A manhole access door 17 is arranged on the side wall of the third pass flue 4, and an ash cleaning hole 18 is arranged at the bottom of the third pass flue 4; the flue gas is discharged from the side wall or the bottom of the middle lower part of the third pass flue 4, and a fourth bypass electric valve 26 is arranged on a pipeline between the flue gas outlet pipe and the first bypass pipe A and the second bypass pipe B; the flue gas outlet pipe 43 is provided with a second oxygen-nitrogen oxide-ammonia concentration integrated sensor 33.
Referring to fig. 4 and 5, the catalyst in the second pass flue and the third pass flue is in a block-shaped structure, the inside of the second pass flue and the third pass flue is provided with low-density catalysts 213 and medium-density catalysts 214 which are arranged in a staggered manner, and the outside of the second pass flue catalyst block except the bottom is provided with high-density catalysts 212; the outer layer of the third pass flue catalyst block except the top is high-density catalyst 212; the catalyst is externally hardened and wrapped with the metal mesh 211, and the volume of the medium density catalyst 214 is more than twice that of the low density catalyst 213.
The ash removal device 21b above the catalyst blocks 22c and 22d in the second-pass flue 3 and the third-pass flue 4 can be a steam type or shock-wave type ash removal device or other devices for safely removing ash without influencing the denitration reaction.
Supporting beams 37 from top to bottom are arranged on two side walls of the second pass flue 3 and the third pass flue 4, the supporting beams 37 are provided with 2-N columns according to the depth of the flues, the supporting beams 37 are provided with guide rails for mounting a lifting horizontal beam 38 in the depth direction, catalyst blocks 22c and 22d with metal wrapping pieces at four corners of the bottom are mounted on the horizontal beam 38, a sliding groove 381 is arranged on the horizontal beam 38 so as to facilitate drawing and pulling of the catalyst blocks during replacement, and an oil seal 382 is arranged on the contact surface between the catalyst blocks and the sliding groove 381 (see fig. 6, fig. 6 shows a structure diagram for mounting the first catalyst block in the second pass flue 3).
The following is the utility model discloses denitrification facility's concrete treatment process explains:
(1) fully mixing the reducing agent with the flue gas:
the reducing agent of the embodiment of the utility model can select liquid ammonia or ammonia water, and is sprayed from the ammonia spraying pipe network 11 in the middle of the first pass flue 2 and is vertical to the flue gas flow; the ammonia spraying main pipe is designed to be of a multi-layer and annular structure according to the flow field characteristics of flue gas, tree-shaped ammonia spraying branch pipes vertical to the main pipe are downwards diverged, the pressure of the ammonia spraying main pipe can be uniformly divided by the ammonia spraying branch pipes, and meanwhile, the spraying flow at the tail end of the pipe section can combine the pressure of a conveying pump with gravity to reach the specified spraying pressure; the ammonia spraying branch pipes are uniformly provided with the spray gun heads facing the central shaft of the first pass flue 2, the spray gun heads of the branch pipes on the most central ring are the most, the spray gun heads are gradually decreased from the center to the spray gun heads on the branch pipes on the outer ring, the spray gun heads between the adjacent ammonia spraying branch pipes are arranged in a staggered mode, the structure corresponds to the concentration of the flue gas flow, and the flue gas flow is perpendicular to the reducing agent for spraying, so that turbulent flow is easily formed, and the flue gas flow and the reducing.
(2) The reaction temperature is kept stable:
the embodiment of the utility model provides a flue gas heater 9a preferably adopts indirect heater, because of the reductant easy explosion that takes place under high temperature, the naked light condition. The heat input by the flue gas heater 9a can meet the requirement that the temperature of the flue gas rises to the reaction temperature of catalytic reduction, namely 280-420 ℃, the optimal reaction temperature is generally set to 370 ℃, the quantity of the input heat is controlled in a chain manner by temperature signals fed back by the temperature sensors 27, 28, 29, 30 and 31, the temperature sensors in the device are mutually referenced, and whether the reaction temperature meets the requirement or not is monitored. The first and second heat conducting baffles 5, 6 guide the flue gas but do not insulate heat, so that the device can more effectively utilize the heat input by the flue gas heater 9 a. It explains additionally, behind the optional sack cleaner of the mounted position of denitrification facility or behind the boiler in concrete project, different mounted positions get into the utility model discloses the flue gas temperature is different, install before the draught fan behind the sack cleaner if denitrification facility, the entry smoke temperature is low, need establish flue gas heater 9a when unsatisfying catalytic reduction reaction temperature requirement, before the deacidification tower after the boiler is installed to denitrification facility, the entry smoke temperature is high, can not establish flue gas heater 9a when satisfying catalytic reduction reaction temperature requirement, but the flue gas behind the boiler contains the dust content height, need be in the same mounted position with flue gas heater 9a, the upper portion and the lower part installation dust removal net of first journey flue 2 just remain the soot blower of top promptly.
If the temperature is not in the reaction range, the operation system can react in time: if in the project application using the vanadium oxide catalyst, the temperature T (DEG C) of the inlet flue gas is less than 304, and the ammonia injection pipe network is closed; the temperature T (DEG C) of the inlet flue gas is less than 320, and the system gives an alarm; the temperature T (DEG C) of the inlet flue gas is more than 410, and the system gives an alarm; the temperature T (DEG C) of the inlet flue gas is more than 430, and the ammonia spraying pipe network is closed.
(3) The reduction reaction in the catalyst block is thorough:
the reduction reaction in the catalyst blocks of the second-pass flue 3 and the third-pass flue 4 is the key for finishing the flue gas denitration. Catalyst blocks 22c and 22d are arranged in the second-pass flue 3 and the third-pass flue 4, low-density catalysts and medium-density catalysts are arranged in a staggered manner in the second-pass flue 3, the catalyst blocks 22c of the second-pass flue 3 except the bottom are high-density catalysts in the outer layer, the catalyst blocks 22d of the third-pass flue 4 except the top are high-density catalysts in the outer layer, mixed gas easily enters a low-density area with large apertures, on one hand, as the resistance of the high-density area of the outer layer is increased, smoke in the low-density area can be secondarily diffused to a main reaction area, namely the medium-density area, so that the reaction is more complete, on the other hand, fly ash in the low-density area is more prone to sedimentation, the catalyst in the main reaction area, namely the medium-density area, is protected. In addition, the first and second flue gas rectifying plates 19 and 20 are arranged before the mixed gas enters the second pass flue 3 and the third pass flue 4, so that the mixed gas is uniformly divided, and reaction media can be uniformly distributed on the catalyst, thereby providing good reaction conditions. Further, the setting up of catalyst piece among the current denitrification facility is mostly 2 ~ 3 catalyst groups of installation in the vertical section of thick bamboo, and the catalyst piece volume is not enough or the flue gas velocity of flow is too big, all easily causes reaction medium dwell time not enough, and the reaction is incomplete, the embodiment of the utility model provides a to put in the two-way flue with the catalyst branch of current device with the volume, the volume of catalyst is unchangeable, nevertheless improves the flue gas flow, increases disorderly degree and reaction time, makes the denitration reaction more abundant, thorough.
(4) Effective removal of fly ash:
fly ash deposition is a major problem affecting plant operation. The flue gas is in the utility model discloses the cigarette journey in the equipment is long, and the velocity of flow is low relatively, the flying dust deposit in the flue gas of being convenient for, and the cigarette journey of flue gas is no longer the single of conventional equipment and goes up or directly down the type always, but horizontal S cigarette journey, and three journey flue bottoms all are equipped with the deposition mouth. The measures for preventing the deposition of the fly ash on the spray gun pipe network 11 of the reducing agent in the first pass flue 2 are as follows: the top of the ammonia water spray gun head is provided with an ash blocking cover, so that fly ash can not block the spray nozzle; meanwhile, a rapping ash remover 12 is arranged on the ammonia spraying main pipe, and fly ash deposited on a pipe network is removed periodically. The measures for preventing the deposition of fly ash on the catalyst block of the key device are as follows: the medium-density and low-density catalysts in the catalyst block are staggered, and the mixed gas easily enters the low-density area and deposits fly ash in the low-density area, so that the main reaction area, namely the medium-density area, in the catalyst block is protected from being damaged; the first and second flue gas rectifying plates 19 and 20 through which the flue gas passes before entering the catalyst and the metal mesh wrapped outside the catalyst have the function of intercepting fly ash; the first and second differential pressure sensors 34 and 35 are respectively arranged in the second pass flue 3 and the third pass flue 4, pressure difference before and after the flue gas enters the catalyst is collected and uploaded, and a telescopic ash cleaner 21b is arranged above each group of catalyst blocks, so that ash removal can be controlled periodically or in a differential pressure linkage manner.
(5) Catalyst failure and replacement:
the catalyst failure is a key fault of the device, whether the catalyst fails or not is preliminarily judged by combining the pressure difference values of the first and second pressure difference sensors 34 and 35, the concentration of nitrogen oxides at the flue gas outlet and the observation in the observation hole 41f, then whether the catalyst test blocks 36g in the second pass flue 3 and the third pass flue 4 fail or not is detected, and if the catalyst fails, the catalyst is replaced. It is generally considered to replace the catalyst in the second pass 3. The catalyst block is in the utility model discloses be convenient for change in the equipment, the measure has: the part of the shell 1 corresponding to the installation position of the catalyst block is assembled in a flange way; a first driving device 39 and a second driving device 40 which are connected with the lifting horizontal beams of the vertical supporting beams in the second-pass flue and the third-pass flue are respectively arranged on the vertical supporting beams in the second-pass flue and the third-pass flue, and each driving device is respectively electrically connected with a main control device; in the vertical direction, the catalyst block can be freely adjusted in position in the vertical direction, so that the proper reaction position can be adjusted in debugging operation and fault operation; in the horizontal direction, the horizontal beams 38 on which the catalyst blocks are mounted are provided with sliding grooves to facilitate the drawing-out when the catalyst blocks are replaced.
(6) Controlling the denitration effect:
the utility model discloses the device is many formulas, and first journey flue provides stable reaction temperature and intensive mixing's turbulent flow, and second journey and third journey flue provide sufficient reaction zone territory and reaction time, and the denitration reaction effect of equipment has been guaranteed to the lasting activity of effectively cleaing away and catalyst of flying dust. Meanwhile, the quantity of the input reducing agent is controlled by the signal values of the first and second oxygen-nitrogen oxide-ammonia concentration integrated sensors 32 and 33 in a linkage manner, the difference value of the first and second oxygen-nitrogen oxide-ammonia concentration integrated sensors 32 and 33 reflects the treatment capacity and efficiency of the device, and the signal values of the first and second oxygen-nitrogen oxide-ammonia concentration integrated sensors 32 and 33 control the ammonia injection amount in a linkage manner, so that the content of nitrogen oxide and the ammonia escape amount in the outlet flue gas are reduced, and the denitration reaction efficiency is improved.
(7) Operation during a fault:
the utility model discloses during the device normal operating, the flue gas advances the pipe 42 from the flue gas at first journey flue 2 top and gets into, through second journey flue 3 and third journey flue 4, lower part lateral wall or bottom discharge in the third journey flue 4.
When the catalyst block 22d in the third pass flue 4 needs to be replaced, overhauled or otherwise failed, the second heat conduction baffle 6 between the second pass flue 3 and the third pass flue 4 and the second electric turnover door 8 form a seal, the first bypass electric valve 23 at the middle lower part of the first pass flue 2 is closed, the second bypass electric valve 24 at the top of the second pass flue 3 is opened, the third bypass electric valve 25 at the top of the third pass flue 4 is closed, the flue gas outlet pipe at the lower part of the third pass flue 4 and the fourth bypass electric valve 26 arranged on the pipeline between the first bypass pipe A and the second bypass pipe B are closed, and the flue gas enters the flue gas outlet pipe 43 from the second bypass pipe B.
When the catalyst block 22c in the second pass flue 3 needs to be replaced, overhauled or otherwise failed, the first heat conduction baffle 5 and the first electric turnover door 7 between the first pass flue 2 and the second pass flue 3 are closed, the first bypass electric valve 23 at the middle lower part of the first pass flue 2 and the third bypass electric valve 25 at the top of the third pass flue 4 are opened, the second bypass electric valve 24 at the top of the second pass flue 3 is closed, the flue gas outlet pipe 43 at the lower part of the third pass flue 4 and the fourth bypass electric valve 26 arranged on the pipeline between the first bypass pipe A and the second bypass pipe B are closed, and the flue gas enters the third pass flue 4 from the first bypass pipe A and enters the flue gas outlet pipe 43 through the third bypass electric valve 25 and the second bypass pipe B.
When the second-pass flue 3 and the third-pass flue 4 both break down or need to be overhauled, the first heat conduction baffle 5 between the first-pass flue 2 and the second-pass flue 3 and the first electric turnover door 7 form a seal, the first bypass electric valve 23 at the middle lower part of the first-pass flue 2 is opened, the second bypass electric valve 24 at the top of the second-pass flue 3 and the third bypass electric valve 25 at the top of the third-pass flue 4 are both closed, the fourth bypass electric valve 26 on the flue gas outlet pipe at the lower part of the third-pass flue 4 and the pipeline between the first bypass pipe A and the second bypass pipe B is opened, and the flue gas enters the flue gas outlet pipe 43 from the first bypass pipe A.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are all covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A multi-pass selective catalytic reduction denitration device is characterized in that an assembled shell is arranged outside the device, a first pass flue, a second pass flue and a third pass flue are vertically arranged in parallel in the assembled shell, and a flue gas inlet pipe is arranged at the top of the first pass flue; a smoke outlet pipe is arranged at the bottom of the third pass flue;
the first pass flue and the second pass flue are separated by a first heat conduction baffle, the bottom in the first pass flue is communicated with the bottom in the second pass flue, and a first electric turnover door is arranged at the communication position;
the second pass flue and the third pass flue are separated by a second heat conduction baffle, the inner top of the second pass flue is communicated with the inner top of the third pass flue, and a second electric turnover door is arranged at the communication position;
the first pass flue, the second pass flue and the third pass flue are communicated to form a transverse S-shaped flue gas channel connected between the flue gas inlet pipe and the flue gas outlet pipe;
a first bypass smoke outlet pipe is arranged at the bottom of the first pass flue, a first bypass electric valve is arranged on the first bypass smoke outlet pipe, and the first bypass smoke outlet pipe is connected to the smoke outlet pipe through a first bypass pipe;
a second bypass smoke outlet pipe is arranged at the top of the second pass flue, a second bypass electric valve is arranged on the second bypass smoke outlet pipe, a third bypass smoke outlet pipe is arranged at the top of the third pass flue, a third bypass electric valve is arranged on the third bypass smoke outlet pipe, and the second bypass smoke outlet pipe and the third bypass smoke outlet pipe are both connected to the smoke outlet pipe through a second bypass pipe;
an ammonia spraying pipe network is arranged in the middle of the first pass flue, a dust remover is arranged on the ammonia spraying pipe network, and a first temperature sensor and a first oxygen-nitrogen oxide-ammonia concentration integrated sensor are respectively arranged at the middle lower part of the first pass flue;
two groups of first catalyst blocks are arranged in the second-pass flue, the two groups of first catalyst blocks are arranged in the second-pass flue through a first position adjusting mechanism, a first flue gas rectifying plate is arranged below the two groups of first catalyst blocks, and an ash cleaner is arranged above each group of first catalyst blocks; a first catalyst test block is arranged between the two groups of first catalyst blocks; a first differential pressure sensor is arranged in the second pass flue, a second temperature sensor is arranged at the bottom in the second pass flue, and a third temperature sensor is arranged at the top in the second pass flue;
two groups of second catalyst blocks are arranged in the third-pass flue, the two groups of second catalyst blocks are arranged in the third-pass flue through a second position adjusting mechanism, a second flue gas rectifying plate is arranged above the two groups of second catalyst blocks, and a dust remover is arranged above each group of second catalyst blocks; a second catalyst test block is arranged between the two groups of second catalyst blocks; a second differential pressure sensor is arranged in the third pass flue, a fourth temperature sensor is arranged at the inner top of the third pass flue, and a fifth temperature sensor is arranged at the inner bottom of the third pass flue;
a second oxygen-nitrogen oxide-ammonia concentration integrated sensor is arranged on the flue gas outlet pipe;
the main control device is respectively electrically connected with each temperature sensor, each oxygen-nitrogen oxide-ammonia concentration integrated sensor, each bypass electric valve, each electric turnover door and each ash remover, obtains signals of each temperature sensor and each oxygen-nitrogen oxide-ammonia concentration integrated sensor, and controls each bypass electric valve, each electric turnover door and each ash remover according to the signals; the main control device is connected with a central control system of the incineration workshop, receives starting and emergency stopping commands of the central control system, and synchronously uploads running state parameter signals of all key components to the central control system.
2. The multi-pass selective catalytic reduction denitration device according to claim 1, wherein the upper part and the lower part in the first-pass flue are respectively provided with a flue gas heater, a compressed air type soot blower is arranged above or on the side of each flue gas heater, each flue gas heater and each compressed air type soot blower are respectively and electrically connected with the main control device, and the main control device controls the operation according to the command of a central control system.
3. The multi-pass scr denitration device according to claim 2, wherein the flue gas heater in the first-pass flue employs an indirect heater.
4. The multi-pass selective catalytic reduction denitration device according to any one of claims 1 to 3, wherein the ash cleaners in the second pass flue and the third pass flue both adopt a steam ash cleaner or a shock wave ash cleaner.
5. The device of any one of claims 1 to 3, wherein the ammonia injection pipe network comprises: the ammonia spraying device comprises an ammonia spraying main pipe, a plurality of ammonia spraying branch pipes, a plurality of spray gun heads and a dust cover; wherein,
the ammonia spraying main pipe is formed by connecting a main pipe with a plurality of annular pipes which have different diameters and are sleeved with each other, a plurality of ammonia spraying branch pipes are uniformly distributed on each annular pipe, each ammonia spraying branch pipe is vertically arranged to be vertical to the annular pipe of the ammonia spraying main pipe, the upper end of each ammonia spraying branch pipe is connected with each annular pipe, and each ammonia spraying branch pipe is vertical to each annular pipe to form a tree-shaped structure which is diverged downwards; a plurality of spray gun heads facing the central shaft of the first pass flue are distributed on each ammonia spraying branch pipe, and the main pipe is communicated with the spray gun heads through each annular pipe and each ammonia spraying branch pipe;
the spray gun heads of the ammonia spraying branch pipes on the most central annular pipe are the most, and the spray gun heads of the ammonia spraying branch pipes on the outer annular pipe from the center are sequentially decreased progressively; the spray gun heads between the adjacent ammonia spraying branch pipes are arranged in a staggered manner; the top of each spray gun head is provided with a dust cover;
the ash remover arranged on the ammonia spraying main pipe adopts a rapping ash remover.
6. The multi-pass scr denitration device according to any one of claims 1 to 3, wherein the first position adjustment mechanism comprises: at least two vertical supporting beams are arranged on the two side walls in the second pass flue, each vertical supporting beam is provided with a guide rail, a lifting horizontal beam is arranged in the guide rail on the two corresponding vertical supporting beams, each lifting horizontal beam is provided with a sliding groove, the sliding groove of each lifting horizontal beam is connected with the bottom of one group of first catalyst blocks, and the contact surface of the first catalyst blocks and the sliding grooves is provided with oil seal;
the first driving device is arranged in the second-stroke flue and is electrically connected with the main control device, and the driving end of the first driving device is connected with the lifting horizontal beam of the first position adjusting mechanism and can drive the lifting horizontal beam to lift on the vertical supporting beam according to the control of the main control device.
7. The multi-pass scr denitration device according to any one of claims 1 to 3, wherein the second position adjustment mechanism comprises: at least two vertical supporting beams are arranged on the two side walls in the third-stroke flue, each vertical supporting beam is provided with a guide rail, a lifting horizontal beam is arranged in the guide rail on the two corresponding vertical supporting beams, each lifting horizontal beam is provided with a sliding groove, the sliding groove of each lifting horizontal beam is connected with the bottom of one group of second catalyst blocks, and the contact surface of the second catalyst blocks and the sliding grooves is provided with oil seal;
and the second driving device is arranged in the third-stroke flue and is electrically connected with the main control device, and the driving end of the second driving device is connected with the lifting horizontal beam of the second position adjusting mechanism and can drive the lifting horizontal beam to lift on the vertical supporting beam according to the control of the main control device.
8. The multi-pass scr denitration device according to any one of claims 1 to 3, wherein each group of the first catalyst block outer layers except the bottom is a high-density catalyst, the surface of the high-density catalyst is a hardened shell, the hardened shell is wrapped with a metal mesh, the high-density catalyst is internally provided with low-density catalysts and medium-density catalysts which are arranged in a staggered manner, and the volume of the medium-density catalysts is more than twice of the volume of the low-density catalysts;
the outer layer of each group of second catalyst blocks is a high-density catalyst except the top, the surface of the high-density catalyst is a hardened shell, the hardened shell is wrapped by a metal mesh, low-density catalysts and medium-density catalysts which are arranged in a staggered mode are arranged in the high-density catalysts, and the volume of the medium-density catalysts is more than twice of that of the low-density catalysts.
9. The multi-pass selective catalytic reduction denitration device according to any one of claims 1 to 3, wherein a first manhole access door is arranged on the side wall of the first pass flue, and a first ash cleaning hole is arranged at the bottom of the first pass flue;
a second manhole access door is arranged on the side wall of the second pass flue, and a second ash cleaning hole is formed in the bottom of the second pass flue;
a third manhole access door is arranged on the side wall of the second pass flue, and a third dust removing hole is formed in the bottom of the second pass flue;
the outer wall of each pass of flue is provided with an observation hole.
10. The multi-pass selective catalytic reduction denitration device according to claim 1, wherein a dust removal net is respectively provided at an upper portion and a lower portion in the first-pass flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720057982.7U CN206474017U (en) | 2017-01-17 | 2017-01-17 | A kind of multiple pass type selective catalytic reduction denitration device |
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| CN201720057982.7U CN206474017U (en) | 2017-01-17 | 2017-01-17 | A kind of multiple pass type selective catalytic reduction denitration device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106540543A (en) * | 2017-01-17 | 2017-03-29 | 启迪桑德环境资源股份有限公司 | A kind of multiple pass type selective catalytic reduction denitration device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106540543A (en) * | 2017-01-17 | 2017-03-29 | 启迪桑德环境资源股份有限公司 | A kind of multiple pass type selective catalytic reduction denitration device |
| CN106540543B (en) * | 2017-01-17 | 2022-12-02 | 启迪环境科技发展股份有限公司 | Multi-pass selective catalytic reduction denitration device |
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Granted publication date: 20170908 Termination date: 20190117 |