CN108283877A - A kind of no dilution water SNCR denitration device and its control method - Google Patents
A kind of no dilution water SNCR denitration device and its control method Download PDFInfo
- Publication number
- CN108283877A CN108283877A CN201810140840.6A CN201810140840A CN108283877A CN 108283877 A CN108283877 A CN 108283877A CN 201810140840 A CN201810140840 A CN 201810140840A CN 108283877 A CN108283877 A CN 108283877A
- Authority
- CN
- China
- Prior art keywords
- ammonium hydroxide
- ammonia
- connecting tube
- dilution water
- tank used
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- 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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to a kind of no dilution water SNCR denitration device and its control methods, including ammonium hydroxide stocking system connected in sequence, ammonium hydroxide transport system and spraying system, compressed air system is set on spraying system, ammonium hydroxide stocking system, ammonium hydroxide transport system, spraying system and compressed air system are connected to control system, and control system connects smoke on-line monitoring system and temperature element.The present invention is fed back using smoke on-line monitoring system and temperature element live signal, control system controls ammonium hydroxide stocking system, ammonium hydroxide transport system, spraying system and compressed air system operation, without dilution water system, improve operation and operational stability, reduce efficiency losses caused by dilution water and because a large amount of water penetrating high temperature waits for a series of problems that denitrification apparatus is brought, denitration efficiency is high, save space, without expensive catalyst or replace air-introduced machine, solution emitted dose automatically adjusts, without large-scale redevelopment boiler, construction period is short, construction is simple, reduce cost, non-secondary pollution.
Description
Technical field
The present invention relates to the separation of gas or steam；The steam of volatile solvent is recycled from gas；Exhaust gas for example starts
Machine exhaust gas, flue gas, smog, flue gas or the chemistry of aerosol or the technical field of biological cleaning, more particularly to a kind of no dilution
Water SNCR denitration device and its control method.
Background technology
A large amount of harmful substance can be discharged in coal in combustion, currently, China is to dust therein, SO2、NOXEtc. carrying
The requirement of control standard is gone out, wherein NOXConcentration of emission≤200mg/Nm3.
The full name in English of SNCR is Selective Non-Catalytic Reduction, i.e. selective non-catalytic reduction
Method refers to that the reducing agent containing amino is uniformly sprayed into pot under the premise of without using catalyst, within the scope of suitable temperature
Stove burner hearth, selectively the NO in flue gasXIt is reduced to nontoxic, free of contamination N2And H2O, to reach emission reduction NOXPurpose, with
Using ammonium hydroxide as reducing agent for, the operation principle of reducing agent is as follows：
（1）6NO+4NH3=>5N2+6H2O；
（2）6NO+8NH3+3O2=>7N2+12H2O；
（3）4NO+4NH3+O2=>4N2+6H2O；
（4）2NO+4NH3+2O2=>3N2+6H2O；
（5）12NO2+10NH3+12O2=>11N2O3+15H2O。
In actual operation, SNCR restores NOXReaction it is very sensitive for temperature condition, choosing a little is sprayed on burner hearth
Select, that is, so-called temperature window selection, be the key that SNCR reduction NO efficiencies.When reaction temperature is excessively high, by
It can make NO in the decomposition of ammoniaXReduction rate reduces, and on the other hand, when reaction temperature is too low, the escape of ammonia increases, and can also make NOXReduction
Rate reduces.And dilution water is all made of in common denitrification apparatus, while dilution water brings the loss of boiler thermal efficiency also as
A large amount of water sprays into high-temperature burner hearth and leads to that thermal control is out-of-sequence, temperature window selection is inaccurate, and it is relatively low to result in denitration efficiency,
The spending for needing catalyst carries out replacing the improvement such as air-introduced machine, and investment cost and operating cost is higher, also need to boiler into
Row large-scale redevelopment.
Invention content
In order to solve the problems in the existing technology, the present invention provide a kind of optimization without dilution water SNCR denitration device
And its control method, heat management precision is high, effectively improves denitration efficiency, reduces denitration cost, reduces because dilution water band is added
The boiler heat loss come.
The technical solution adopted in the present invention is that a kind of no dilution water SNCR denitration device, the denitrification apparatus includes suitable
Ammonium hydroxide stocking system, ammonium hydroxide transport system and the spraying system of secondary connection, the spraying system cooperation are equipped with compressed air system,
The ammonium hydroxide stocking system, ammonium hydroxide transport system, spraying system and compressed air system are connected to control system, the control system
System is connected with smoke on-line monitoring system and temperature element.
Preferably, the ammonium hydroxide stocking system includes tank used for storing ammonia, and the tank used for storing ammonia is pumped equipped at least one discharging,
Liquid level gauge is equipped in the tank used for storing ammonia, the connecting tube that the tank used for storing ammonia and discharging pump is equipped with first pressure transmitter, institute
It states tank used for storing ammonia and is connected to ammonium hydroxide transport system；The liquid level gauge and first pressure transmitter are connected to control system.
Preferably, the top of the tank used for storing ammonia is equipped with ammonia absorption slot and air admission valve.
Preferably, the ammonium hydroxide transport system includes at least one ammonium hydroxide delivery pump connected in sequence and flowmeter, the ammonia
Strainer is equipped in connecting tube between water delivery pump and ammonium hydroxide stocking system, the flowmeter is connected to spraying system；The ammonium hydroxide
Ammonium hydroxide regulating valve is additionally provided in connecting tube between delivery pump and spraying system；The ammonium hydroxide delivery pump, flowmeter and ammonium hydroxide are adjusted
Valve is connect with control system.
Preferably, the ammonium hydroxide delivery pump and the connecting tube of flowmeter are equipped with buffer.
Preferably, the spraying system includes the ammonia water spray gun that several and control system being set up in parallel is connect；The ammonia
Connecting tube between water conveying system and spraying system is equipped with second pressure transmitter.
Preferably, the connecting tube of the second pressure transmitter and any ammonia water spray gun be equipped with spinner flowmeter and manually
Regulating valve.
Preferably, the compressed air system includes the self-contained pressure regulator being connect with control system, described to rely on oneself
Formula pressure-regulating valve is connect with main connecting tube, and strainer, the main connecting tube and several branch arranged side by side are equipped in the main connecting tube
Tube space connection is connected, any connecting tube is equipped with ammonia water spray gun one-to-one correspondence；In the main connecting tube
Equipped with third pressure transmitter.
A kind of control method using the no dilution water SNCR denitration device the described method comprises the following steps：
Step 1：It is waiting for denitration outlet setting smoke on-line monitoring system, is waiting for denitrification apparatus inlet setting thermometric member
Part；Start control system；
Step 2：It is long-range to observe the liquid level that ammonia absorbs in slot, opens process water solenoid supply valve and adds liquid level in ammonia absorption slot
To requiring liquid level；
Step 3：A concentration of 20% ammonium hydroxide is transported by groove tank car to scene, and tank used for storing ammonia is delivered to by discharging pump；Pass through the first pressure
Power transmitter obtains the tank internal pressure of tank used for storing ammonia in real time, and when the tank internal pressure of tank used for storing ammonia is excessively high, ammonia is discharged into ammonia and absorbs slot,
Ammonia is absorbed；After the completion of unloading ammonia, opens ammonia and absorb slot and discharge the solenoid valve that ammonia absorbs slot, ammonia solution is put
Enter tank used for storing ammonia；
Step 4：Start denitration operation, denitrification apparatus consumes ammonium hydroxide in the process of running, and the tank internal pressure of tank used for storing ammonia is made to be in true
When empty, control system controls air admission valve work, and air is put into tank used for storing ammonia；
Step 5：Wait for that denitrification apparatus is persistently overheating, when the temperature element displays temperature in denitrification apparatus is 850~1100 DEG C,
Self-contained pressure regulator compresses air to 400KPa, while ammonium hydroxide delivery pump exports ammonium hydroxide towards ammonia water spray gun；
Step 6：Control system receives the feedback data of smoke on-line monitoring system, and ammonium hydroxide regulating valve is adjusted according to data, until
Dust emission concentration≤30mg/Nm3, SO2Concentration of emission≤200mg/ Nm3, NOXConcentration of emission≤200mg/Nm3 is shut down.
Preferably, in the step 5, when the temperature element displays temperature in denitrification apparatus is less than 800 DEG C, ammonium hydroxide is defeated
Pump is sent to shut down.
The present invention provides a kind of optimizations without dilution water SNCR denitration device and its control method, by by denitrification apparatus
It is set as ammonium hydroxide stocking system, ammonium hydroxide transport system and spraying system connected in sequence, compressed air is set on spraying system
System carries out real-time signal feedback to control system using smoke on-line monitoring system and temperature element, and then controls ammonium hydroxide
The specific operation of stocking system, ammonium hydroxide transport system, spraying system and compressed air system.The present invention is than traditional SNCR denitration work
Skill saves dilution water system, greatly improves operation and operational stability, reduces the damage because of the boiler thermal efficiency that dilution water is brought
It loses, and because a large amount of water penetrating high temperature waits for a series of problems that denitrification apparatus is brought, effectively improves denitration efficiency, save sky
Between, expensive catalyst is not used, solution injection can automatically adjust emitted dose with the variation of boiler load, without to boiler
Large-scale redevelopment is carried out, it is small on boiler influence, air-introduced machine need not be replaced, the construction period is short, construction is simple, hence it is evident that reduce de-
Nitre investment cost and operating cost does not generate secondary pollution, with the obvious advantage.
Description of the drawings
Fig. 1 is the process structure schematic diagram of the present invention, wherein solid line is conveying ammonium hydroxide pipe, and chain-dotted line is compression
Air is managed, and the arrow on solid line and chain-dotted line is respectively the conveying direction of ammonia water and air, dotted line frame be ammonium hydroxide stocking system,
The whole signal wire frame of ammonium hydroxide transport system, spraying system and compressed air system.
Specific implementation mode
The present invention is described in further detail with reference to embodiment, but protection scope of the present invention is not limited to
This.
The present invention relates to a kind of no dilution water SNCR denitration device, the denitrification apparatus includes ammonium hydroxide storage connected in sequence
System 1, ammonium hydroxide transport system 2 and spraying system 3, the cooperation of the spraying system 3 are equipped with compressed air system 4, the ammonium hydroxide storage
Deposit system 1, ammonium hydroxide transport system 2, spraying system 3 and compressed air system 4 are connected to control system 5, and the control system 5 connects
It is connected to smoke on-line monitoring system 6 and temperature element 7.
In the present invention, denitrification apparatus includes ammonium hydroxide stocking system 1, ammonium hydroxide transport system 2 and spraying system connected in sequence
3, compressed air system 4 is set on spraying system 3.
In the present invention, ammonium hydroxide stocking system 1 is used for the spraying system 3 of ammonium hydroxide for being kept in the ammonium hydroxide after discharging；
Ammonium hydroxide transport system 2 ensures its adjustability for exporting the ammonium hydroxide in ammonium hydroxide stocking system 1 backward according to demand；Spray
Penetrate system 3 act directly on boiler etc. need carry out denitration operation high temperature wait on denitrification apparatus 8, match with compressed air system 4
It closes in the high-temperature burner hearth that ammonia water spray is entered to wait for denitrification apparatus 8, carries out denitration operation.
In the present invention, control system 5 is for realizing functions such as data acquisition, continuous control, the program controls of the present apparatus.One
As in the case of, according to SNCR system integrated artistic flows the characteristics of, in conjunction with control section technology requirement, may be used PLC come
Monitor entire SNCR denitration device.Control system 5 plays the role of control in itself, this be skilled addressee readily understands that
Content, specific function, which is realized, to be voluntarily arranged according to demand by those skilled in the art.
In the present invention, control system 5 is mainly fed back using the live signal of smoke on-line monitoring system 6 and temperature element 7,
And then control the specific operation of ammonium hydroxide stocking system 1, ammonium hydroxide transport system 2, spraying system 3 and compressed air system 4, wherein
Smoke on-line monitoring system 6, which is mounted on, to be waited on such as flue or chimney of boiler and its flue gas emission of denitrification apparatus 8, temperature element 7
Mounted on spraying system 3 with react the junction of burner hearth, wait for the inlet of denitrification apparatus 8.In actual operating process, survey
The component of changes in resistance value by temperature change such as thermal resistance may be used in warm element 7, generally waits for denitrification apparatus 8 certainly
Band, it is only necessary to achieve the purpose that thermometric and feedback signal, smoke on-line monitoring system 6（CEMS）For those skilled in the art
The technology contents known can be configured in denitrification apparatus as needed.
The present invention saves dilution water system than traditional SNCR denitration technique, substantially increases operation and operational stability, subtracts
The loss because of the boiler thermal efficiency that dilution water is brought is lacked, and because a large amount of water penetrating high temperature waits for one that denitrification apparatus 8 is brought
Series of problems effectively improves denitration efficiency, saves space, does not use expensive catalyst, solution injection can be with boiler
The variation of load automatically adjusts emitted dose, small on boiler influence without carrying out large-scale redevelopment to boiler, need not replace air inducing
Machine, the construction period is short, construction is simple, hence it is evident that reduces denitrification investment cost and operating cost, does not generate secondary pollution, advantage is bright
It is aobvious.
The ammonium hydroxide stocking system 1 includes tank used for storing ammonia 9, and the tank used for storing ammonia 9 is equipped at least one discharging and pumps 11, institute
It states and is equipped with liquid level gauge 12 in tank used for storing ammonia 9, the connecting tube of the tank used for storing ammonia 9 and discharging pump 11 is equipped with first pressure transmitter
13, the tank used for storing ammonia 9 is connected to ammonium hydroxide transport system 2；The liquid level gauge 12 and first pressure transmitter 13 are connected to control
System 5.
The top of the tank used for storing ammonia 9 is equipped with ammonia and absorbs slot 14 and air admission valve 15.
In the present invention, ammonium hydroxide stocking system 1 includes the tank used for storing ammonia 9 for storing ammonium hydroxide, and tank used for storing ammonia 9 is equipped at least
1 discharging pump 11, under normal circumstances, including 2 dischargings pump 11,1 group of normal use, and another 1 group is spare.
In the present invention, the liquid level gauge 12 in tank used for storing ammonia 9 is used to indicate the storage capacity of ammonium hydroxide, generally uses liquid level sensor
, the first pressure transmitter 13 in the connecting tube of tank used for storing ammonia 9 and discharging pump 11 is for ensureing in tank used for storing ammonia 9
Positive pressure is normal, and liquid level gauge 12 and first pressure transmitter 13 are connect with control system 5, for providing ammonium hydroxide stocking system 1 in real time
Current state.
In the present invention, ammonium hydroxide is generally transported by groove tank car 16 to scene, denitrification apparatus 8 is being waited for according to nearby principle, such as pot
Nearby ammonium hydroxide stocking system 1 is arranged in vacant lot to stove, and the ammonium hydroxide in groove tank car 16 squeezes into tank used for storing ammonia 9 by discharging pump 11.
In the present invention, strainer 28 is generally set in the front end pipeline of discharging pump 11, the ammonia for filtering the output of groove tank car 16
Impurity in water.
In the present invention, ammonia is escaped in order to prevent, therefore absorbs slot 14 in the tank top of tank used for storing ammonia 9 setting ammonia, in ammonia
Preset process water in aspiration slot 14, during unloading ammonia, ammonia, which is dissolved in water, becomes ammonia spirit, completes after unloading ammonia, ammonia is inhaled
The ammonia spirit received in slot 14 puts back to tank used for storing ammonia 9, and closes valve, ensures that ammonia does not leak.
In the present invention, to avoid tank used for storing ammonia 9 from leading to vacuum due to spraying ammonium hydroxide, pacify in the tank top of tank used for storing ammonia 9
Air admission valve 15 is filled, during operation, when vacuum in tank used for storing ammonia 9, air admission valve 15 automatically turns on, and air is put into ammonia
Water storage tank 9.
The ammonium hydroxide transport system 2 includes at least one ammonium hydroxide delivery pump 17 connected in sequence and flowmeter 18, the ammonium hydroxide
Strainer 28 is equipped in connecting tube between delivery pump 17 and ammonium hydroxide stocking system 1, the flowmeter 18 is connected to spraying system 3；Institute
It states and is additionally provided with ammonium hydroxide regulating valve 19 in the connecting tube between ammonium hydroxide delivery pump 17 and spraying system 3；The ammonium hydroxide delivery pump 17, flow
Meter 18 and ammonium hydroxide regulating valve 19 are connect with control system 5.
The ammonium hydroxide delivery pump 17 and the connecting tube of flowmeter 18 are equipped with buffer 20.
In the present invention, ammonium hydroxide transport system 2 adjusts the conveying capacity of ammonium hydroxide according to the quantity of required ammonium hydroxide in real time comprising extremely
Few 1 ammonium hydroxide delivery pump 17, is under normal circumstances 2, as spare；Flow is controlled by flowmeter 18, is waiting for denitrification apparatus 8
When more, the area of passage that ammonium hydroxide can also be controlled by the way that ammonium hydroxide regulating valve 19 is arranged on branch line, ammonium hydroxide delivery pump 17, flow
Meter 18 and ammonium hydroxide regulating valve 19 carry out corresponding function realization by the control information of control system 5.
In the present invention, the position of ammonium hydroxide regulating valve 19 need to only ensure after ammonium hydroxide delivery pump 17, and ammonium hydroxide is adjusted in Fig. 1
Valve 19 is illustrated position.
In the present invention, in order to ensure that the ammonium hydroxide of injection can be normally carried out denitration operation, stored up in ammonium hydroxide delivery pump 17 and ammonium hydroxide
Strainer 28 is set in the connecting tube between deposit system 1, for filtering off impurity.
In the present invention, in order to ensure the safety of conveying, it is arranged in ammonium hydroxide delivery pump 17 and the connecting tube of flowmeter 18
Buffer 20, for cutting down peak flow, increase piping flow valley ensures that the ammonium hydroxide in connecting tube can slowly, steadily flow out,
Reduce the flow pulsation of pipeline so that overall operation safety.Under normal circumstances, buffer 20 can select pulse buffer 20.
In the present invention, in order to further ensure the safety of ammonium hydroxide conveying, peace is set between tank used for storing ammonia 9 and buffer 20
Full pipe 29, and safety valve 10 is set on bursting tube 29, once whole out of control, safety valve 10 is opened.
The spraying system 3 includes the ammonia water spray gun 21 that several and control system 5 being set up in parallel is connect；The ammonium hydroxide is defeated
The connecting tube between system 2 and spraying system 3 is sent to be equipped with second pressure transmitter 22.
The connecting tube of the second pressure transmitter 22 and any ammonia water spray gun 21 is equipped with spinner flowmeter 23 and manually
Regulating valve.
The compressed air system 4 includes the self-contained pressure regulator 24 being connect with control system 5, the self-operated type pressure
Force regulating valve 24 is connect with main connecting tube 25, and strainer 28 is equipped in the main connecting tube 25, if the main connecting tube 25 and dry doubling
26 space of branch connecting tube of row is connected to, and any connecting tube 26 is equipped with the one-to-one correspondence of the ammonia water spray gun 21；Institute
It states main connecting tube 25 and is equipped with third pressure transmitter 27.
In the present invention, spraying system 3 should adapt to any based model for load duration between 50%~100% load of boiler and transport safely
Row, and adapt to the requirement of the load variations and Unit Commitment number of unit.
In the present invention, ammonia water spray gun 21 is traditionally arranged to be 4, for waiting for that denitrification apparatus 8 sprays into ammonium hydroxide to high temperature；Second pressure
Power transmitter 22 is used for the pressure value to 5 Real-time Feedback connecting tube of control system, ensures the safety and in place of integral spray.
In the present invention, the connecting tube of any ammonia water spray gun 21 is equipped with spinner flowmeter 23, is measured according to Throttle Principle
Fluid flow changes the circulation area of fluid to keep the differential pressure constant of rotor or more.
In the present invention, it is additionally provided with manual modulation valve at ammonia water spray gun 21, is used for according to actual conditions to ammonia water spray gun 21
The liquid that goes out be adjusted, meet normal, the flexible progress of denitration operation.
In the present invention, compressed air system 4 uses self-contained pressure regulator 24, is not necessarily to external energy, can be in no electricity
The occasion of no gas works, and has not only facilitated but also energy saving, while pressure segmentation limit is thin and crosses one another, degree of regulation is high, pressure
The mechanism of balanced type makes self-contained pressure regulator 24 be quick on the draw, and control is accurate.
In the present invention, self-contained pressure regulator 24 is connect with main connecting tube 25, the guaranteed nothing of setting in main connecting tube 25
The strainer 28 of impurity, such as the particulate matter in air is filtered out, while main connecting tube 25 and several 26 spaces of branch connecting tube arranged side by side
Connection, any connecting tube 26 are equipped with the one-to-one correspondence of ammonia water spray gun 21, are used for the accurate operation of spraying system 3.
In the present invention, third pressure transmitter 27 is set in main connecting tube 25, and real-time reading numerical values are further ensured that behaviour
It the safety of work and spends in place.
The invention further relates to a kind of control method using the no dilution water SNCR denitration device, the method includes
Following steps.
Step 1：It is waiting for the outlet of denitrification apparatus 8 setting smoke on-line monitoring system 6, is waiting for the setting of 8 inlet of denitrification apparatus
Temperature element 7；Start control system 5.
In the present invention, smoke on-line monitoring system 6 is used to monitor the basic index of the gas of discharge, as dust emission is dense
Degree, SO2Concentration of emission, NOXConcentration of emission, exhaust temperature etc., and control system 5 is fed data back to, it is carried out by control system 5
The real-time judge of next step.
In the present invention, temperature element 7 is arranged in the inlet for waiting for denitrification apparatus 8, for detecting the reaction for waiting for denitrification apparatus 8
Whether temperature is within the scope of Optimal Temperature.
Step 2：It is long-range to observe the liquid level that ammonia absorbs in slot 14, opens process water solenoid supply valve and ammonia is absorbed into slot 14
Interior liquid level, which adds to, requires liquid level.
Step 3：A concentration of 20% ammonium hydroxide is transported by groove tank car 16 to scene, and tank used for storing ammonia 9 is delivered to by discharging pump 11；
The tank internal pressure for obtaining tank used for storing ammonia 9 in real time by first pressure transmitter 13, when the tank internal pressure of tank used for storing ammonia 9 is excessively high, ammonia
It is discharged into ammonia and absorbs slot 14, ammonia is absorbed；After the completion of unloading ammonia, opens ammonia and absorb slot 14 and discharge ammonia absorption slot 14
Solenoid valve, ammonia solution is put into tank used for storing ammonia 9.
In the present invention, ammonia is escaped in order to prevent, therefore absorbs slot 14 in the tank top of tank used for storing ammonia 9 setting ammonia, in ammonia
Preset process water in aspiration slot 14, during unloading ammonia, ammonia, which is dissolved in water, becomes ammonia spirit, completes after unloading ammonia, ammonia is inhaled
The ammonia spirit received in slot 14 puts back to tank used for storing ammonia 9, and closes valve, ensures that ammonia does not leak.
Step 4：Start denitration operation, denitrification apparatus consumes ammonium hydroxide, makes at the tank internal pressure of tank used for storing ammonia 9 in the process of running
When vacuum, control system 5 controls air admission valve 15 and works, and air is put into tank used for storing ammonia 9.
In the present invention, to avoid tank used for storing ammonia 9 from leading to vacuum due to spraying ammonium hydroxide, pacify in the tank top of tank used for storing ammonia 9
Air admission valve 15 is filled, during operation, when vacuum in tank used for storing ammonia 9, air admission valve 15 automatically turns on, and air is put into ammonia
Water storage tank 9.
Step 5：Wait for that denitrification apparatus 8 is persistently overheating, when wait for 7 displays temperature of temperature element in denitrification apparatus 8 be 850~
At 1100 DEG C, self-contained pressure regulator 24 compresses air to 400KPa, while ammonium hydroxide delivery pump 17 is defeated towards ammonia water spray gun 21
Go out ammonium hydroxide.
In the step 5, when 7 displays temperature of temperature element in denitrification apparatus 8 is less than 800 DEG C, ammonium hydroxide delivery pump
17 shut down.
In the present invention, the optimal operating temperature of denitration operation is 850~1100 DEG C, when measuring current reaction temperature herein
When in range, court waits for that denitrification apparatus 8 sprays ammonium hydroxide and carries out denitration reaction, and works as the temperature for waiting for denitrification apparatus 8 down to 800 DEG C or less
When, ammonium hydroxide delivery pump 17 is directly shut down, the work of denitrification apparatus is prevented.
Step 6：Control system 5 receives the feedback data of smoke on-line monitoring system 6, and ammonium hydroxide regulating valve is adjusted according to data
19, until dust emission concentration≤30mg/Nm3, SO2Concentration of emission≤200mg/ Nm3, NOXConcentration of emission≤200mg/Nm3,
It shuts down.
In the present invention, ammonium hydroxide regulating valve 19 links with flue gas online monitoring data 6, and realizes analog regulation, as environmental protection is wanted
Seek NOXWhen discharge standard requirement is 150mg/Nm3, the aperture of ammonium hydroxide regulating valve 19 is adjustable, while can also pass through manual modulation valve
Assist adjusting, enabling more accurately adjust NO of the ammonium hydroxide regulating valve 19 in different openingXConcentration of emission, so as to set ammonia
The open range of water regulating valve 19, makes NOXConcentration of emission fluctuates within the scope of 120-130 mg/Nm3, final to realize full-automatic fortune
Row.
In the present invention, the process of adjusting can be obtained by the experiment of limited number of time, such as work as NOXConcentration of emission it is excessively high when,
The conveying intensity of ammonium hydroxide delivery pump 17 should suitably be increased, while the aperture of ammonium hydroxide regulating valve 19 increases and assists manual modulation valve
Aperture is adjusted, is slowly adjusted according to flue gas online monitoring data and obtains acceptance value.This process is that those skilled in the art are easy reason
The content of solution can voluntarily be adjusted according to demand.
The present invention is by setting denitrification apparatus to ammonium hydroxide stocking system 1, ammonium hydroxide transport system 2 and injection connected in sequence
Compressed air system 4 is arranged in system 3 on spraying system 3, is to control using smoke on-line monitoring system 6 and temperature element 7
System 5 carries out real-time signal feedback, and then controls ammonium hydroxide stocking system 1, ammonium hydroxide transport system 2, spraying system 3 and compressed air
The specific operation of system 4.The present invention saves dilution water system than traditional SNCR denitration technique, substantially increases operation and operation is steady
It is qualitative, reduce the loss because of the boiler thermal efficiency that dilution water is brought, and 8 band of denitrification apparatus is waited for because a large amount of water sprays into high temperature
The a series of problems come, effectively improves denitration efficiency, saves space, does not use expensive catalyst, solution injection can
Emitted dose is automatically adjusted with the variation of boiler load, it is small on boiler influence without carrying out large-scale redevelopment to boiler, it need not be more
Air-introduced machine is changed, the construction period is short, construction is simple, hence it is evident that denitrification investment cost and operating cost are reduced, secondary pollution is not generated,
It is with the obvious advantage.
Claims (10)
1. a kind of no dilution water SNCR denitration device, it is characterised in that：The denitrification apparatus includes ammonium hydroxide storage connected in sequence
System, ammonium hydroxide transport system and spraying system, the spraying system cooperation are equipped with compressed air system, ammonium hydroxide storage system
System, ammonium hydroxide transport system, spraying system and compressed air system are connected to control system, and the control system is connected with flue gas and exists
Line monitoring system and temperature element.
2. a kind of no dilution water SNCR denitration device according to claim 1, it is characterised in that：The ammonium hydroxide stocking system
Including tank used for storing ammonia, the tank used for storing ammonia is pumped equipped at least one discharging, and liquid level gauge, the ammonia are equipped in the tank used for storing ammonia
The connecting tube of water storage tank and discharging pump is equipped with first pressure transmitter, and the tank used for storing ammonia is connected to ammonium hydroxide transport system；Institute
It states liquid level gauge and first pressure transmitter is connected to control system.
3. a kind of no dilution water SNCR denitration device according to claim 2, it is characterised in that：The top of the tank used for storing ammonia
Portion is equipped with ammonia and absorbs slot and air admission valve.
4. a kind of no dilution water SNCR denitration device according to claim 1, it is characterised in that：The ammonium hydroxide transport system
Including at least one ammonium hydroxide delivery pump connected in sequence and flowmeter, the connection between the ammonium hydroxide delivery pump and ammonium hydroxide stocking system
Strainer is equipped in pipe, the flowmeter is connected to spraying system；In connecting tube between the ammonium hydroxide delivery pump and spraying system also
Equipped with ammonium hydroxide regulating valve；The ammonium hydroxide delivery pump, flowmeter and ammonium hydroxide regulating valve are connect with control system.
5. a kind of no dilution water SNCR denitration device according to claim 4, it is characterised in that：The ammonium hydroxide delivery pump and
The connecting tube of flowmeter is equipped with buffer.
6. a kind of no dilution water SNCR denitration device according to claim 1, it is characterised in that：The spraying system includes
The ammonia water spray gun that several and control system being set up in parallel is connect；In connecting tube between the ammonium hydroxide transport system and spraying system
Equipped with second pressure transmitter.
7. a kind of no dilution water SNCR denitration device according to claim 6, it is characterised in that：The second pressure pick-up
The connecting tube of device and any ammonia water spray gun is equipped with spinner flowmeter and manual modulation valve.
8. a kind of no dilution water SNCR denitration device according to claim 1, it is characterised in that：The compressed air system
Include the self-contained pressure regulator being connect with control system, the self-contained pressure regulator is connect with main connecting tube, described
Strainer is equipped in main connecting tube, the main connecting tube connect tube space connection, any connecting tube with several branch arranged side by side
It is equipped with ammonia water spray gun one-to-one correspondence；The main connecting tube is equipped with third pressure transmitter.
9. a kind of control method without dilution water SNCR denitration device using described in one of claim 1 ~ 8, it is characterised in that：
It the described method comprises the following steps：
Step 1：It is waiting for denitration outlet setting smoke on-line monitoring system, is waiting for denitrification apparatus inlet setting thermometric member
Part；Start control system；
Step 2：It is long-range to observe the liquid level that ammonia absorbs in slot, opens process water solenoid supply valve and adds liquid level in ammonia absorption slot
To requiring liquid level；
Step 3：A concentration of 20% ammonium hydroxide is transported by groove tank car to scene, and tank used for storing ammonia is delivered to by discharging pump；Pass through the first pressure
Power transmitter obtains the tank internal pressure of tank used for storing ammonia in real time, and when the tank internal pressure of tank used for storing ammonia is excessively high, ammonia is discharged into ammonia and absorbs slot,
Ammonia is absorbed；After the completion of unloading ammonia, opens ammonia and absorb slot and discharge the solenoid valve that ammonia absorbs slot, ammonia solution is put
Enter tank used for storing ammonia；
Step 4：Start denitration operation, denitrification apparatus consumes ammonium hydroxide in the process of running, and the tank internal pressure of tank used for storing ammonia is made to be in true
When empty, control system controls air admission valve work, and air is put into tank used for storing ammonia；
Step 5：Wait for that denitrification apparatus is persistently overheating, when the temperature element displays temperature in denitrification apparatus is 850~1100 DEG C,
Self-contained pressure regulator compresses air to 400KPa, while ammonium hydroxide delivery pump exports ammonium hydroxide towards ammonia water spray gun；
Step 6：Control system receives the feedback data of smoke on-line monitoring system, and ammonium hydroxide regulating valve is adjusted according to data, until
Dust emission concentration≤30mg/Nm3, SO2Concentration of emission≤200mg/ Nm3, NOXConcentration of emission≤200mg/Nm3 is shut down.
10. a kind of control method of no dilution water SNCR denitration device according to claim 9, it is characterised in that：It is described
In step 5, when the temperature element displays temperature in denitrification apparatus is less than 800 DEG C, ammonium hydroxide delivery pump is shut down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810140840.6A CN108283877A (en) | 2018-02-11 | 2018-02-11 | A kind of no dilution water SNCR denitration device and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810140840.6A CN108283877A (en) | 2018-02-11 | 2018-02-11 | A kind of no dilution water SNCR denitration device and its control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108283877A true CN108283877A (en) | 2018-07-17 |
Family
ID=62833083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810140840.6A Pending CN108283877A (en) | 2018-02-11 | 2018-02-11 | A kind of no dilution water SNCR denitration device and its control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108283877A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109529590A (en) * | 2019-01-09 | 2019-03-29 | 王煜翔 | A kind of equipment for denitrifying flue gas |
| CN110302671A (en) * | 2019-04-25 | 2019-10-08 | 太仓北新建材有限公司 | A kind of spray ammonia control system |
| CN111686570A (en) * | 2020-07-22 | 2020-09-22 | 天津中材工程研究中心有限公司 | System and method for tail gas denitration of independent heat source grinding system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203737102U (en) * | 2014-04-04 | 2014-07-30 | 大唐科技产业集团有限公司 | Distribution and injection module and system for SNCR (Selective Non Catalytic Reduction) flue gas denitrification system |
| CN204121964U (en) * | 2014-08-13 | 2015-01-28 | 云南博曦环保设备有限公司 | Cement kiln kiln gas denitrification apparatus |
| CN204307519U (en) * | 2014-12-11 | 2015-05-06 | 南京西普环保科技有限公司 | A kind of high integration denitration device |
| WO2016112716A1 (en) * | 2015-01-13 | 2016-07-21 | 广州特种承压设备检测研究院 | Method for optimizing sncr denitration system of garbage incinerator by adding anionic surfactant |
| CN205760580U (en) * | 2016-05-30 | 2016-12-07 | 江苏三井环保股份有限公司 | Circulating fluidized bed boiler flue gas denitrification system |
| CN208049698U (en) * | 2018-02-11 | 2018-11-06 | 浙江蓝星环保设备有限公司 | A kind of no dilution water SNCR denitration device |
-
2018
- 2018-02-11 CN CN201810140840.6A patent/CN108283877A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203737102U (en) * | 2014-04-04 | 2014-07-30 | 大唐科技产业集团有限公司 | Distribution and injection module and system for SNCR (Selective Non Catalytic Reduction) flue gas denitrification system |
| CN204121964U (en) * | 2014-08-13 | 2015-01-28 | 云南博曦环保设备有限公司 | Cement kiln kiln gas denitrification apparatus |
| CN204307519U (en) * | 2014-12-11 | 2015-05-06 | 南京西普环保科技有限公司 | A kind of high integration denitration device |
| WO2016112716A1 (en) * | 2015-01-13 | 2016-07-21 | 广州特种承压设备检测研究院 | Method for optimizing sncr denitration system of garbage incinerator by adding anionic surfactant |
| CN205760580U (en) * | 2016-05-30 | 2016-12-07 | 江苏三井环保股份有限公司 | Circulating fluidized bed boiler flue gas denitrification system |
| CN208049698U (en) * | 2018-02-11 | 2018-11-06 | 浙江蓝星环保设备有限公司 | A kind of no dilution water SNCR denitration device |
Non-Patent Citations (1)
| Title |
|---|
| 中国环境科学学会: "中国环境科学学会学术年会论文集 2012 第三卷", 中国农业大学出版社, pages: 2176 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109529590A (en) * | 2019-01-09 | 2019-03-29 | 王煜翔 | A kind of equipment for denitrifying flue gas |
| CN110302671A (en) * | 2019-04-25 | 2019-10-08 | 太仓北新建材有限公司 | A kind of spray ammonia control system |
| CN111686570A (en) * | 2020-07-22 | 2020-09-22 | 天津中材工程研究中心有限公司 | System and method for tail gas denitration of independent heat source grinding system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108283877A (en) | A kind of no dilution water SNCR denitration device and its control method | |
| CN104775876A (en) | Exhaust smoke passage integrated purification system for plurality of diesel engine test table frames | |
| CN208049698U (en) | A kind of no dilution water SNCR denitration device | |
| CN109569294A (en) | Magnesite shaft furnace flue gas NO_x Reduction by Effective equipment and its technique | |
| CN104056541A (en) | Denitration system combining SNCR with low-temperature SCR and used for household garbage incinerator | |
| CN110141961A (en) | A kind of coal-burning boiler full load SCR denitration system | |
| CN209612647U (en) | Magnesite shaft furnace flue gas NO_x Reduction by Effective equipment | |
| CN204352751U (en) | The SNCR denitration device of the compatible ammoniacal liquor of a kind of urea | |
| CN212156660U (en) | Solution conveying device | |
| CN209348406U (en) | A kind of heating of kiln system and nitrous oxides concentration control device during only expecting | |
| CN107321182A (en) | Exhaust treatment system | |
| CN204543971U (en) | A kind of SNCR denitration device | |
| CN203648379U (en) | Automatic urea-adding device for selective non-catalytic reduction flue gas denitrification | |
| CN102764571A (en) | SCNR (Selective catalytic NOx Reduction) denitration system for boiler | |
| CN205844030U (en) | Portable the escaping of ammonia chemical absorbing sampling apparatus | |
| CN205760638U (en) | One uniformly sprays ammonia system | |
| CN106762044B (en) | A kind of gas auxiliary metering injection system and its control method | |
| CN211302681U (en) | Ammonia spraying device with accurate and controllable ammonia spraying amount in SCR system | |
| CN208364218U (en) | Integrated multi-functional jet control system | |
| CN207462957U (en) | A kind of controllable denitrification apparatus of distribution | |
| CN206526673U (en) | Denitrification reducing agent automatic regulating system | |
| CN208534585U (en) | A kind of automatic control system of internal combustion engine generator group SCR denitration | |
| CN208287810U (en) | A kind of novel ammonia-spraying grid header | |
| CN216878687U (en) | High temperature dust removal denitration integration equipment | |
| CN209055859U (en) | A kind of regeneration activity liquid concentration adjusting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |