CN106540543B - Multi-pass selective catalytic reduction denitration device - Google Patents
Multi-pass selective catalytic reduction denitration device Download PDFInfo
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- CN106540543B CN106540543B CN201710036186.XA CN201710036186A CN106540543B CN 106540543 B CN106540543 B CN 106540543B CN 201710036186 A CN201710036186 A CN 201710036186A CN 106540543 B CN106540543 B CN 106540543B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
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- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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Abstract
The invention discloses a multi-pass selective catalytic reduction denitration device, wherein an assembled shell is arranged outside the device, and the shell is divided into a first pass flue, a second pass flue and a third pass flue according to the smoke trend; the top of the first pass flue is connected with a flue gas inlet pipe, the top and the lower part of the first pass flue are respectively provided with a flue gas heater, and the middle part of the first pass flue is provided with an ammonia spraying pipe network; the middle lower part is provided with a temperature sensor and an oxygen-nitrogen oxide-ammonia concentration integrated sensor; catalyst blocks are arranged in the second and third pass flues, a flue gas rectifying plate is arranged below the catalyst blocks, a dust remover is arranged above each group of catalyst blocks, a temperature sensor is arranged at the top in the flue, a pressure difference sensor is arranged on the side wall in the flue, and each pass flue is provided with a manhole access door and a dust removing hole; the flues are separated by a partition plate and an electric turnover door; the lower part of the first pass flue, the upper parts of the second pass flue and the third pass flue are respectively connected with a by-pass pipe provided with an electric valve, and an oxygen-nitrogen oxide-ammonia concentration integrated sensor is arranged on the flue gas outlet pipe. The device has high reaction efficiency, long service life of the catalyst and easy maintenance.
Description
Technical Field
The invention relates to the field of power generation and environmental protection, in particular to a multi-pass selective catalytic reduction denitration device.
Background
A large amount of toxic and harmful gases are generated in the burning process of coal and household garbage, wherein nitrogen oxides are paid much attention due to high harmfulness and high disposal difficulty. NO x Acid 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 of the selective catalytic reduction method can reach more than 90%.
China starts late in the control of nitrogen oxide emission, and a selective catalytic reduction denitration device is single in structure, a reducing agent nozzle is generally arranged in a flue connected in front of the denitration device, and the denitration device is a vertical cylinder type structure provided with a multilayer catalyst and has the main problems in the application process: 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.
Disclosure of Invention
Based on the problems in the prior art, the invention aims to provide a multi-pass selective catalytic reduction denitration device which is high in reaction efficiency, long in service life of a catalyst and easy to overhaul and maintain.
The purpose of the invention is realized by the following technical scheme:
the embodiment of the invention provides a multi-pass selective catalytic reduction denitration device, wherein 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 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 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 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 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 the starting and emergency stopping commands of the central control system, and synchronously uploads the running state parameter signals of all key components to the central control system.
According to the technical scheme provided by the invention, the denitration device provided by the embodiment of the invention has the beneficial effects that:
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 reaction temperature fluctuation is small, the reaction condition is 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 cleaning 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-range 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 nitrogen oxide content and 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 required to be used in the description of the embodiments are briefly introduced 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 the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a multi-pass SCR denitration apparatus according to 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 grid according to an embodiment of the present invention;
FIG. 4 is a schematic view of an edge portion of a first catalyst block in a second pass flue according to an embodiment of the present invention;
FIG. 5 isbase:Sub>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 invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the specific contents of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within 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, where an assembled structure casing is provided outside the device, a first pass flue, a second pass flue and a third pass flue are vertically arranged in parallel in the assembled structure 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 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.
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 content of the first and second substances,
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 perpendicular 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 perpendicular to each annular pipe to form a downward-diverging 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 inner side walls of 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 and 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 one group of second catalyst blocks, and the contact surface of the second catalyst blocks and the sliding grooves is provided with 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, medium density and high density, so that the full reaction of the reducing agent and the flue gas is 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 flues of all the courses, 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 mounting positions of key components such as the catalyst block, the ammonia injection pipe network and the like are assembled in a flange way 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 part 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 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 way; the top of the spray gun head is provided with a dust cover; a rapping ash cleaner 12 is arranged on the ammonia spraying mother pipe.
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 shell 1 corresponding to 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 a description of a specific treatment process of the denitration apparatus of the present invention:
(1) Fully mixing the reducing agent with the flue gas:
the reducing agent can be selected from liquid ammonia or ammonia water, and is sprayed from an 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; spray gun heads facing the central axis of the first pass flue 2 are uniformly arranged on the ammonia spraying branch pipes, 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 outer ring branch pipes, the spray gun heads between the adjacent ammonia spraying branch pipes are arranged in a staggered manner, the structure corresponds to the concentration of flue gas flow, and the flue gas flow is vertical to the reducing agent for spraying, so that turbulent flow is easily formed, and the flue gas flow and the reducing agent are fully mixed.
(2) The reaction temperature is kept stable:
the flue gas heater 9a of the embodiment of the invention preferably adopts an indirect heater, because the reducing agent is easy to explode under the conditions of high temperature and open fire. 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 as 370 ℃, the quantity of the input heat is controlled by temperature signals fed back by the temperature sensors 27, 28, 29, 30 and 31 in a chain manner, the temperature sensors in the device are mutually referred, 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 should be noted that, in a specific project, the installation position of the denitration device may be after the bag-type dust remover or after the boiler, and the flue gas entering the embodiment of the present invention at different installation positions has different temperatures, for example, the denitration device is installed before the induced draft fan behind the bag-type dust remover, and the flue gas heater 9a is required to be installed when the inlet flue gas temperature is low and does not meet the temperature requirement of the catalytic reduction reaction, for example, the denitration device is installed before the deacidification tower behind the boiler, and the flue gas heater 9a is not required to be installed when the inlet flue gas temperature is high and meets the temperature requirement of the catalytic reduction reaction, but the flue gas behind the boiler has high dust content and needs to be installed at the same installation position as the flue gas heater 9a, that is, the upper part and the lower part of the first pass flue 2 are installed with dust removing nets and the soot blowers above are reserved.
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, the service life is longer, and the effective time of the reaction is long enough. 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. Furthermore, the catalyst blocks in the existing denitration device are mostly arranged in a vertical cylinder, 2-3 catalyst groups are installed in the vertical cylinder, the volume of the catalyst blocks is insufficient or the flow rate of flue gas is too large, so that the retention time of a reaction medium is easily insufficient, and the reaction is incomplete.
(4) Effective removal of fly ash:
fly ash deposition is a major problem affecting plant operation. The smoke path of the smoke in the device is long, the flow rate is relatively low, the fly ash in the smoke is convenient to deposit, the smoke path of the smoke is not a single straight-up or straight-down type of the traditional device, but a transverse S smoke path, and the bottom of a three-path flue is provided with an ash accumulation port. 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 smoke outlet and the view 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 convenient to replace in the device of the invention, and the measures are as follows: 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 freely adjust the position in the vertical direction so as to adjust the proper reaction position in debugging operation and fault operation; in the horizontal direction, the horizontal beam 38 on which the catalyst block is mounted is provided with a sliding groove to facilitate the pulling out of the catalyst block during its replacement.
(6) Controlling the denitration effect:
the device provided by the invention is multi-pass, the first pass flue provides stable reaction temperature and fully mixed turbulent flow, the second pass flue and the third pass flue provide sufficient reaction area and reaction time, the fly ash is effectively removed, the lasting activity of the catalyst is ensured, and the denitration reaction effect of the device is ensured. 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:
when the device of the invention is in normal operation, the flue gas enters from the flue gas inlet pipe 42 at the top of the first pass flue 2, passes through the second pass flue 3 and the third pass flue 4, and is discharged from the side wall or the bottom of the middle lower part of the third pass 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 are both in failure 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 are closed, 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 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 included in the scope of the present invention. Therefore, the protection scope of the present invention should 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 the assembled shell in parallel, 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 inner bottom of the first pass flue is communicated with the inner bottom of 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 and 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 cleaner, acquires 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 cleaner 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;
the main control 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 ash cleaner and each position adjusting mechanism, logically calculates the injection amount of the reducing agent, the heating amount of the flue gas, the ash cleaning period of an ammonia injection pipe network and a catalyst, and controls the operation in the fault period; the programmable control system uploads each key signal of operation and fault to a central control system of the incineration workshop, and receives and responds to the starting and emergency stopping commands of 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 multipass 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 type ash cleaner or a shock wave type 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 content of the first and second substances,
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 trunk 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 sequentially decrease from the center; the spray gun heads between the adjacent ammonia spraying branch pipes are arranged in a staggered way; the top of each spray gun head is provided with a dust cover;
the ash cleaner arranged on the ammonia spraying main pipe adopts a vibration ash cleaner.
6. The multiple pass selective catalytic reduction denitration apparatus of 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 inner side walls of 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 flue and 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 dust removing 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.
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| CN108889118A (en) * | 2018-09-21 | 2018-11-27 | 南京兰丰环保科技有限公司 | A kind of SCR equipment for denitrifying flue gas |
| CN109140477A (en) * | 2018-10-08 | 2019-01-04 | 江苏太湖锅炉股份有限公司 | A kind of drawer type afterheat energy-saving device |
| CN116812946B (en) * | 2023-08-25 | 2024-01-02 | 福建天甫电子材料有限公司 | Concentration control method and system for electronic grade ammonia water production |
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