CN109821392A - A kind of denitrating system and its control method of dry method cement rotary kiln - Google Patents
A kind of denitrating system and its control method of dry method cement rotary kiln Download PDFInfo
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- CN109821392A CN109821392A CN201910163496.7A CN201910163496A CN109821392A CN 109821392 A CN109821392 A CN 109821392A CN 201910163496 A CN201910163496 A CN 201910163496A CN 109821392 A CN109821392 A CN 109821392A
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Abstract
The invention discloses a kind of denitrating system of dry method cement rotary kiln and its control methods, by the way that reductant injection system is respectively set in dore furnace and C5 cyclone cylinder, two-way ammonium hydroxide reducing agent individually measures distribution, the spray ammonia reducing agent dosage for controlling dore furnace first is allowed to meet the ammonia nitrogen concentration requirement of discharge outlet, start the spraying system of C5 cyclone cylinder when the spray ammonia of dore furnace reduction dosage reaches maximum value and the ammonia nitrogen concentration of exiting flue gas is still unsatisfactory for environmental requirement, by secondary spray ammonia be allowed to the further chemical combination of NOx in flue gas, be reduced into nitrogen and water.The denitrating system of the application can make the ammonia nitrogen concentration stability contorting of exiting flue gas in 100mg/Nm3Within, it meets environmental requirements；And ammonium hydroxide consumption is small, operating cost is low.
Description
Technical field
The present invention relates to gas denitrifying technology fields, and in particular to a kind of denitrating system of dry method cement rotary kiln and its control
Method processed.
Background technique
Mainly there is common NOx control method on dry method cement rotary kiln: the burning condition of optimization kiln and dore furnace is to subtract
The generation of few ammonia nitrogen；Change proportion scheme, mix mineralizer in the hope of reducing sinter leaching temperature and time, improves clinker and easily burn
Property, reduce the generation of ammonia nitrogen；Using the burner of low NOx；Using the stage burning technology in kiln tail dore furnace and pipeline.So
And even if common four kinds of methods are used in combination, the NOx emission of cement kiln is also extremely difficult to 500mg/Nm3Below.
In order to reduce ammonia nitrogen concentration of emission, many newly-built cement drying production lines start using selective non-catalytic reduction
(SNCR) denitration method or selective catalytic reduction (SCR) denitration method further decrease NOx emission concentration, in the hope of reaching NOx emission
Concentration is in 100mg/Nm3Within environmental requirement.But existing denitrating system using effect is undesirable, main problem is denitration
Low efficiency, ammonium hydroxide consumption is big, and operating cost is high；The control of NOx emission concentration is unstable, often occurs more than the peak of environmental requirement
Value.
SNCR is to spray into nitrogenous chemical agent in flue gas at 850~1050 DEG C, and the NOx in flue gas is restored and is generated
The method of nitrogen and water.In general the temperature range of the dore furnace middle and upper part reaction temperature window that just meets SNCR, i.e., 850
~1050 DEG C, there is good denitration effect using SNCR method, and be not necessarily to catalyst, build and operating cost is below SCR.Cause
This existing dry method cement rotary kiln, which is generally used in dore furnace, is arranged denitration spray gun, using SNCR method denitration, but it is simple
SNCR denitration technology is used on dore furnace, often occur ammonium hydroxide spray into it is excessive cause use cost high or ammonium hydroxide spray into it is insufficient
The problem for causing interim nitrogen oxides exceeded.
Summary of the invention
To solve to use SNCR denitration technology in the prior art, the control of NOx emission concentration is unstable to be not achieved environmental requirement,
Ammonium hydroxide consumption is big, the high problem of operating cost；Present inventor in the furnace to dore furnaces various in cement industry by flowing
After field and thermo parameters method and fuel characteristic have done in-depth study and a large amount of analysis work, discovery and decomposition furnace outlet
The air inlet or air outlet of the C5 cyclone cylinder being connected also comply with the reaction temperature window of SNCR, in dore furnace and C5 cyclone cylinder
Spray gun group of the appropriate location setting by optimization, can effectively promote the removal efficiency of NOx, can be by the NOx concentration of kiln exit gas
Drop to 100mg/Nm3Hereinafter, the usage amount of ammonium hydroxide can be greatly decreased simultaneously.
Present inventor proposes the denitrating system and method for a kind of dry method cement rotary kiln, by dore furnace and
Ammonia water spray system is respectively set in C5 cyclone cylinder, and two-way ammonium hydroxide individually measures distribution, and the ammonia spraying amount of control dore furnace first is allowed to
The ammonia nitrogen concentration requirement for meeting discharge outlet, when the ammonia spraying amount of dore furnace reaches maximum value and the ammonia nitrogen concentration of exiting flue gas is still discontented
The spraying system for starting C5 cyclone cylinder when toe ring guaranteed request is allowed to and the further chemical combination of NOx in flue gas, general by secondary spray ammonia
It is reduced into nitrogen and water, and the ammonia nitrogen concentration stability contorting of exiting flue gas is met environmental requirements within 100mg/Nm3.
The first technical solution that the present invention uses is: a kind of denitrating system of dry method cement rotary kiln, including reducing agent are defeated
Send module, metering distribution module and several groups mixing jetting module；The mixing jetting module is respectively arranged on cement rotary kiln point
In the temperature range for meeting SNCR reaction temperature window for solving furnace and C5 cyclone cylinder, for being sprayed into dore furnace and C5 cyclone cylinder
Reducing agent makes the reduction of the NOx in flue gas generate nitrogen and water；Reducing agent conveyor module is used for the conveying of reducing agent, metering distribution mould
The reducing agent that block is used to come the conveying of reducing agent conveyor module is rationed to each mixing jetting module.
The second technical solution that the present invention uses is the improvement in the first technical solution, the second technology that the present invention uses
Scheme is: the temperature range is 850 DEG C~1050 DEG C.Temperature window constrains the selection for spraying into point position, while also determining
Residence time of the reducing agent in dore furnace, the ingredients such as O2, CO, H20, H2, CHi in flue gas all generate one to NH3x reaction
Fixed influence.For O2, in the case where anoxic, SNCR reaction can't occur, and oxygen concentration 0.5%~
Between 2.2%, final NOx concentration variation is little.It is higher in the interior denitration efficiency of 850 DEG C~1050 DEG C temperature ranges.
The third technical solution that the present invention uses is the improvement in first or second technical solution, the present invention use
Three technical solutions are: the mixing jetting module includes annular spray gun group, and the annular spray gun group includes several denitration spray guns,
The denitration spray gun is inserted radially into along dore furnace and C5 cyclone cylinder, and is uniformly distributed in the circumferential, in the injection of single branch spray gun
The radial line of heart line and dore furnace and C5 cyclone cylinder is in 5~15 ° of angles.Spray gun and it is arranged radially angle, when can make lance ejection
Cyclonic action is generated, keeps effective covering surface of spraying system higher, to improve denitration efficiency, reduces amount of ammonia slip, is reduced de-
Nitre operating cost；Influence of the escaping of ammonia to dedusting, waste heat power generation equipment can also be reduced simultaneously, reduce equipment corrosion.
The 4th technical solution that the present invention uses is the improvement in third technical solution, the 4th technology that the present invention uses
Scheme is: the denitration spray gun is two-fluid PQ-02 type spray gun, and the atomizing pressure of spray gun is 0.5~0.8Mpa, and atomizing particle is
20~80um.
Spray gun is the key equipment of SNCR denitration, and atomizing effect is directly related to the denitration efficiency of entire denitrating system.
The PQ-02 spray gun of western general environmental protection is second generation double fluid spray gun body, makes ammonia atomization by the motive force of compressed air, in high temperature height
Also can have good atomizing effect and penetration capacity in the environment of dust.Had using the PQ-02 spray gun being integrated resistance to
Mill, can quickly adjust the characteristics of spray angle at corrosion-resistant, high temperature resistant, can by reducing agent high-efficient atomizing and and compressed air it is abundant
Mixing, and function is indicated by flow, the service condition of spray gun is checked in real time, quickly finds the abnormal conditions of spray gun.
The 5th technical solution that the present invention uses is the improvement in third technical solution, the 5th technology that the present invention uses
Scheme is: the mixing jetting module further includes the compressed air endless tube for being successively centered around annular denitration spray gun group periphery, reduction
Agent endless tube and ejected wash water endless tube；Compressed air endless tube is connect by branch pipe with the compressed air inlet of every denitration spray gun, is used for
Injection power source is provided for spray gun, reducing agent is atomized and reaches spray distance；Reducing agent endless tube passes through branch pipe and every denitration
The reducing agent import of spray gun connects, for providing reducing agent for spray gun；Ejected wash water endless tube passes through branch pipe and every denitration spray gun
Water inlet connection is cleaned, for providing cleaning water source cleaning spray gun.
The ammonia atomization for being sprayed spray gun by compressed air, the ammonium hydroxide after atomization is sufficiently mixed with flue gas to react,
Compressed air maintains a normally open state when running, and on the one hand injection power source is provided for spray gun, on the other hand as the cooling of spray gun
Cleaning medium protects spray gun not to be blocked or burn out.Water lines are cleaned when normal operation to be in close state, and only are stopping spraying
Just ejected wash water is opened when ammonia, rinses spray gun, prevents spray gun from blocking or corroding.
The 6th technical solution that the present invention uses is the improvement in third technical solution, the 6th technology that the present invention uses
Scheme is: the reducing agent conveyor module includes reducing agent delivery pump, and reducing agent delivery pump is used for going back in reducing agent storage tank
Former agent is delivered to denitration spray gun group by measuring distribution module.
The 7th technical solution that the present invention uses is the improvement in the 6th technical solution, the 7th technology that the present invention uses
Scheme is: the metering distribution module includes flowmeter, pressure transmitter, flow control valve and branch line；The branched pipe
The general import on road is connect with the outlet of reducing agent conveyor module, and the outlet of each branch line is successively arranged flow control valve, flow
Meter and pressure transmitter, the outlet of each branch line are connect with the reducing agent import of annular spray gun group respectively, and flow control valve is used
In adjusting the uninterrupted for entering the reducing agent of each annular spray gun group, flowmeter is used for metered flow, and pressure transmitter is for examining
Survey the injection pressure for entering the reducing agent of each annular spray gun group.
The 8th technical solution that the present invention uses is the improvement in the 7th technical solution, the 8th technology that the present invention uses
Scheme is: the denitrating system further includes PLC control system and the ammonia nitrogen concentration detector that flue gas emission mouth is arranged in, and ammonia nitrogen is dense
Degree detector, flowmeter, pressure transmitter, flow control valve and reducing agent delivery pump are connect with PLC control system respectively；Ammonia nitrogen
The outlet ammonia nitrogen concentration value that concentration detector will test is sent to PLC control system, and PLC control system is according to outlet ammonia nitrogen concentration
Control the aperture of flow control valve.
The 9th technical solution that the present invention uses is: the control method of denitrating system described in the 8th technical solution, including
Following steps:
9.1, first according to the setting point of the factors such as the dore furnace fluid field in furnace and thermo parameters method of the different type of furnaces, fuel characteristic
Solve the reducing agent allocation proportion sprayed into furnace and C5 cyclone cylinder；The NOx emission concentration of exhanst gas outlet is set according to emission request；
9.2, PLC control system compares the NOx real value and setting value of on-line checking in real time, calculates the absolute of the two difference
Value A；Set the upper limit value and lower limit value of absolute difference A；
9.3, PLC control system supplies reducing agent to dore furnace and C5 cyclone cylinder respectively in the ratio of setting；When NOx is real-time
Value be more than setting value and absolute difference A reach the upper limit or NOx real value be not above setting value but it is on the rise when, PLC
Control system controls flow control valve on the branch line for supplying dore furnace in metering distribution module first and increases aperture, increases and divides
The input quantity of furnace reduction agent is solved, incrementss and absolute difference A are linearly related, and absolute difference A is bigger, and incrementss are bigger；
After reducing agent increases to a certain amount of in dore furnace, outlet Nox concentration decline, absolute difference A reduces, as absolute difference A
Current reducing agent input quantity is maintained when being reduced to setting lower limit；After reducing agent increases to maximum in dore furnace, outlet Nox is dense
Degree does not reach requirement still, and flow on the branch line of C5 cyclone cylinder is supplied in PLC control system control metering distribution module and is adjusted
Valve increases aperture, increases reducing agent input quantity in C5 cyclone cylinder, incrementss and absolute difference A are linearly related, absolute difference A
Bigger, incrementss are bigger；After reducing agent increases to a certain amount of in C5 cyclone cylinder, absolute difference is worked as in outlet Nox concentration decline
A maintains current reducing agent input quantity when being reduced to setting lower limit；
9.4, when NOx real value is lower than setting value and reaches the upper limit, PLC control system controls point of C5 cyclone cylinder first
The flow control valve of bye-pass reduces aperture, reduces reducing agent input quantity, reduction amount and the linear phase of absolute difference A in cyclone cylinder
It closes, absolute difference A is bigger, and reduction amount is bigger；After reducing agent is reduced to a certain amount in cyclone cylinder, outlet Nox concentration rises,
Absolute difference A reduces, and current reducing agent input quantity is maintained when absolute difference A is reduced to setting lower limit, when setting maintains
Between be T1, if NOx real value is always below setting value in the T that holds time, PLC control system close C5 cyclone cylinder point
Flow control valve on bye-pass stops supplying reducing agent to C5 cyclone cylinder；Flow tune on the branch line of dore furnace is controlled simultaneously
It saves valve and reduces aperture, reduce reducing agent input quantity in dore furnace, reduction amount and absolute difference A are linearly related, absolute difference A
Bigger, reduction amount is bigger；After dore furnace reducing agent is reduced to a certain amount, outlet Nox concentration rises, and absolute difference A reduces,
Current reducing agent input quantity is maintained when absolute difference A is reduced to setting lower limit；
9.5, setting is held time lowers when NOx real value is always below setting value in the T2 that holds time again for T2
Dore furnace reducing agent input quantity, further decreases reducing agent input quantity.
Since from spray ammonia to reaction zone, kiln tail detection time is needed 2~3 minutes, and the control and regulation of reducing agent output quantity have
Biggish hysteresis quality, in order to reduce hysteresis quality effect, this system uses above-mentioned trend control methods, and adjusted stepwise dore furnace and C5
The input quantity of reducing agent in cyclone cylinder, decomposition in-furnace temperature is higher and ammonia in flue gas nitrogen concentration is high, so controlling dore furnace first
Interior denitration effect, the denitration effect when denitration effect is not reached requirement in dore furnace in control C5 cyclone cylinder are total to improve
Denitration efficiency.
Beneficial effects of the present invention:
(1) by the way that ammonia water spray system is respectively set in dore furnace and C5 cyclone cylinder, two-way ammonium hydroxide individually measures the application
The ammonia spraying amount of distribution, first control dore furnace is allowed to meet the ammonia nitrogen concentration requirement of discharge outlet, when the ammonia spraying amount of dore furnace reaches
The ammonia nitrogen concentration of maximum value and exiting flue gas is still unsatisfactory for starting the spraying system of C5 cyclone cylinder when environmental requirement, passes through secondary spray
Ammonia be allowed to the further chemical combination of NOx in flue gas, be reduced into nitrogen and water, the ammonia nitrogen concentration stability contorting of exiting flue gas exists
Within 100mg/Nm3, meet environmental requirements.
(2) for the application by using annular efficient spray gun group, effective spray distance of the oblique insertion of every spray gun, spray gun is super
3 meters are crossed, spray gun mist hat is higher to the covering surface of flue.And more tiltedly spray being used cooperatively for spray gun, can also generate certain rotation
Stream effect, keeps effective covering surface of spraying system higher, to improve denitration efficiency, reduces amount of ammonia slip, reduces denitration operation
Cost and influence to dedusting and waste heat power generation equipment reduce the consumption of relevant device spare part.
Detailed description of the invention
Fig. 1 is the main view of the embodiment 1 of the denitrating system of dry method cement rotary kiln of the present invention, and reduction is omitted in figure
Agent conveyor module and metering distribution module.
Fig. 2 is the side view of Fig. 1.
Fig. 3 is that the structure of the mixing jetting module of the embodiment 1 of the denitrating system of dry method cement rotary kiln of the present invention is shown
It is intended to.
Fig. 4 is the denitration of the mixing jetting module of the embodiment 1 of the denitrating system of dry method cement rotary kiln of the present invention
The structural schematic diagram of spray gun.
Fig. 5 is the decomposition annular denitration spray gun group of the embodiment 1 of the denitrating system of dry method cement rotary kiln of the present invention
Arrangement schematic diagram.
Fig. 6 is the mist field effect simulation schematic diagram that denitration spray gun group shown in Fig. 5 is formed, and a is injection blind area, and b covers for flow field
Cover area, c are spraying overlapping region.
Fig. 7 is the scheme of installation of the denitration spray gun of the embodiment 1 of the denitrating system of dry method cement rotary kiln of the present invention.
Fig. 8 is the control flow signal of the embodiment 2 of the denitrating system control method of dry method cement rotary kiln of the present invention
Figure.
Fig. 9 and Figure 10 is that the control of the embodiment 2 of the denitrating system control method of dry method cement rotary kiln of the present invention is former
Manage schematic diagram.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing and a kind of preferred reality
Mode is applied technical solution of the present invention is clearly and completely described.
Embodiment 1
Refering to fig. 1 and Fig. 2, a kind of denitrating system of dry method cement rotary kiln, the rotary kiln include dore furnace 01 and C5 rotation
The outlet of air duct 02, dore furnace 01 is connect with the import of C5 cyclone cylinder 02, the flue gas most outlet discharge through C5 cyclone cylinder 02 afterwards, C5
Online ammonia nitrogen concentration detector is arranged in the exit of cyclone cylinder 02.The furnace diameter of dore furnace 01 is 5000mm, C5 cyclone cylinder 02
Diameter be 6000mm, the production capacity of rotary kiln is 2000 ton/days.
The denitrating system includes former agent conveyor module, metering distribution module and two groups of mixing jetting modules, first group of mixing
Jet module is set to the middle and upper part of cement rotary kiln dore furnace 01, the area A as shown in Figure 1；Second group of mixing jetting module is set to C5
The air inlet of cyclone cylinder 02, the area B as shown in Figure 1.It further include PLC control system and the ammonia nitrogen concentration that flue gas emission mouth is set
Detector.The running temperature in the area A is 850~1050 DEG C, and the running temperature in the area B is 850~1050 DEG C.
In this embodiment, reducing agent used in denitrating system is ammonium hydroxide.Two groups of mixing jetting modules are respectively used to dore furnace
And ammonium hydroxide is sprayed in C5 cyclone cylinder.Every group of mixing jetting module includes annular denitration spray gun group and is successively centered around annular denitration
Compressed air endless tube 2, ammonium hydroxide endless tube 3 and the ejected wash water endless tube 4 of spray gun group periphery.
In the present embodiment, each annular denitration spray gun group includes four denitration spray guns 1, and denitration spray gun 1 is using western general
The PQ-02 type double fluid spray gun body of environmental protection, the atomizing pressure of spray gun are 0.5~0.8Mpa, and atomizing particle is 20~80um, and spray gun reaches
The effective spray distance arrived is 3 meters.
The structure of denitration spray gun 1 is referring to Fig. 4, the central part of denitration spray gun is axially arranged with ammonium hydroxide channel 107, ammonium hydroxide channel
107 rear end is equipped with the cleaning water inlet 103 axially communicated with ammonium hydroxide channel 107, by plug when cleaning water inlet 103 is run
105 closings；It is additionally provided with ammonium hydroxide channel 107 through to the ammonium hydroxide import 101 communicated.The front end connection ammonium hydroxide spray in ammonium hydroxide channel 107
First 108.The outside in ammonium hydroxide channel 107 is equipped with compressed air channel 106, and the rear end of compressed air channel 106 is equipped with empty with compression
Gas channel 106 is through being equipped with dispersive nozzle 104 to the front end of the compressed air inlet 102 communicated, compressed air channel 106, from ammonia
The ammonium hydroxide that the spout of sprinkler head 108 sprays is sprayed from dispersive nozzle 104 after compressed air is atomized.
The setting of annular denitration spray gun group referring to Fig. 5, Fig. 5 is the annular denitration spray gun group being arranged on dore furnace 01,
The annular denitration spray gun group being arranged on cyclone cylinder is identical as dore furnace.Four denitration spray guns 1 be each passed through protective jacket 5 along point
Solution furnace and C5 cyclone cylinder are inserted radially into, the interior fireplace inner wall of dore furnace and cyclone cylinder that end face is no more than, every spray gun
The angle α of spray centerline and the radial line of dore furnace and C5 cyclone cylinder is 15 °, and four denitration spray guns 1 are revolved in dore furnace and C5
The circumferential direction of air duct is uniformly distributed.Protective jacket is high temperature resistant casing, and dore furnace and C5 whirlwind is arranged in by welding in advance
On the side wall of cylinder.
In other implementations, the spray gun of different number can be set according to the cement rotary kiln of different outputs, realize reduction
Agent farthest covers flue, guarantees denitration effect.
The mist field effect simulation schematic diagram that the annular denitration spray gun group of dore furnace is formed is injection blind area referring to Fig. 6, a, and b is
Flow field overlay area, c are spraying overlapping region.As seen from Figure 6, covering surface of the spray gun mist hat being obliquely installed to dore furnace flue
Higher, injection blind area is smaller.
It is the mixing jetting module being arranged on dore furnace 01 that the installation of mixing jetting module, which please refers to 3, Fig. 3, and setting exists
Mixing module on cyclone cylinder is identical as dore furnace.Compressed air endless tube 2 is empty by branch pipe and the compression of every denitration spray gun
Gas import 102 connects, and compressed air pipe network or air compressor machine are connected to by pipeline with compressed air endless tube 2, compressed air pipe network or
Air compressor machine provides injection power source for spray gun.Ammonium hydroxide endless tube 3 is connect by branch pipe with the ammonium hydroxide import 101 of every denitration spray gun,
Ammonium hydroxide endless tube 3 is connect by pipeline with assignment of traffic module, provides ammonium hydroxide for denitration spray gun.Ejected wash water endless tube 3 by branch pipe with
The cleaning water inlet 103 of every denitration spray gun connects, and cleaning pipe network is connect by pipeline with ejected wash water endless tube 3, sprays for denitration
Rifle provides cleaning water source cleaning spray gun.
The installation of denitration spray gun inspection platform is referring to Fig. 7, being 1.3~1.5 meters apart from denitration spray gun mounting height
Steel platform and guardrail is arranged in lower section, facilitates the safety operation and maintenance of ammonia spraying system.
In this embodiment, former agent conveyor module includes ammonium hydroxide delivery pump and transfer pipeline, and ammonium hydroxide delivery pump can be equipped with one
Or more, the import of delivery pump is connect by pipeline with tank used for storing ammonia, and ammonium hydroxide is transported by dedicated tank car, is unloaded ammonia pump and is transferred to ammonia
In water storage tank.The outlet of delivery pump passes through the inlet communication of pipeline and distribution and computation module, and pump discharge is furnished with pressure gauge, supervises in real time
Survey pump pressure, while pressure sensor being installed, pressure sensor and delivery pump are electrically connected with PLC control system, pressure sensor to
PLC control system provides real-time pressure signal, and entire pumping plant may be implemented on the spot and remotely to control.
In this embodiment, metering distribution module includes flowmeter, pressure transmitter, flow control valve and branch line；Institute
State branch line general import and ammonium hydroxide delivery pump outlet connect, the outlet of each branch line respectively with two mixing jetting modules
Ammonium hydroxide endless tube 3 connect.The outlet of each branch line is successively arranged flow control valve, flowmeter and pressure transmitter, flow tune
Section valve is used to adjust the uninterrupted of the reducing agent into each annular spray gun group, and flowmeter is used for metered flow, pressure transmitter
For detecting the ammonia water spray pressure into each annular spray gun group.Flowmeter, pressure transmitter and flow are adjusted is with PLC control
System electrical connection.
Embodiment 2
A kind of control method of denitrating system as tdescribed in embodiment 1, comprising the following steps:
2.1, the reducing agent allocation proportion sprayed into dore furnace and C5 cyclone cylinder is set first；Set the NOx of exhanst gas outlet
Concentration of emission；In this embodiment, the amount ratio of dore furnace and C5 cyclone cylinder reducing agent is set as 5:1, and exhanst gas outlet NOx emission is dense
Degree is 90mg/Nm3。
2.2, PLC control system compares the NOx real value and setting value of on-line checking in real time, calculates the absolute of the two difference
Value A；Set the upper limit value and lower limit value of absolute difference A；In this embodiment it is assumed that the upper limit value of absolute difference A is
5mg/Nm3, lower limit value 1mg/Nm3；
2.3, PLC control system supplies reducing agent to dore furnace and C5 cyclone cylinder respectively in the ratio of setting.When NOx is real-time
Value is more than setting value and absolute difference A reaches 5mg/Nm3, i.e. NOx real value is in 95mg/Nm3When；Or NOx real value does not surpass
Cross setting value but it is on the rise when i.e. absolute difference A is increasing；PLC control system controls metering distribution module first
Flow control valve increases aperture on the branch line of middle supply dore furnace, increases the input quantity of reducing agent in dore furnace, incrementss
Linearly related with absolute difference A, absolute difference A is bigger, and incrementss are bigger；When in dore furnace reducing agent increase to it is a certain amount of
Afterwards, outlet Nox concentration decline, absolute difference A reduces, when absolute difference A is reduced to 1mg/Nm3When, pre reduction is worked as in maintenance
Agent input quantity；After reducing agent increases to maximum in dore furnace, outlet Nox concentration is not reached requirement still, PLC control system control
Flow control valve on the branch line of C5 cyclone cylinder is supplied in system metering distribution module and increases aperture, increases reduction in C5 cyclone cylinder
Agent input quantity, incrementss and absolute difference A are linearly related, and absolute difference A is bigger, and incrementss are bigger；When in C5 cyclone cylinder
Reducing agent increase to it is a certain amount of after, outlet Nox concentration decline, when absolute difference A is reduced to 1mg/Nm3When maintain work as pre reduction
Agent input quantity；
2.4, when NOx real value lower than setting value and reaches upper limit 5mg/Nm3When, PLC control system controls C5 rotation first
The flow control valve of the branch line of air duct reduces aperture, reduces reducing agent input quantity in cyclone cylinder, and reduction amount is absolute with difference
Value A is linearly related, and absolute difference A is bigger, and reduction amount is bigger；After reducing agent is reduced to a certain amount in cyclone cylinder, Nox is exported
Concentration rises, and absolute difference A reduces, when absolute difference A is reduced to 1mg/Nm3Current reducing agent input quantity is constantly maintained,
It is 10 minutes that setting, which is held time, if NOx real value is always below setting value in 10 minutes, PLC control system is closed
Flow control valve on the branch line of C5 cyclone cylinder stops supplying reducing agent to C5 cyclone cylinder；The branch of dore furnace is controlled simultaneously
Flow control valve reduces aperture on pipeline, reduces reducing agent input quantity, reduction amount and the linear phase of absolute difference A in dore furnace
It closes, absolute difference A is bigger, and reduction amount is bigger；After dore furnace reducing agent is reduced to a certain amount, outlet Nox concentration rises, poor
It is worth absolute value A to reduce, when absolute difference A is reduced to 1mg/Nm3When maintain current reducing agent input quantity；
2.5, it is 15 minutes that setting, which is held time, when NOx real value is always below setting value in 15 minutes, is lowered again
Dore furnace reducing agent input quantity, further decreases reducing agent input quantity.
Denitrating system is run using the control method of embodiment 2, monitors its operational process, denitration system within continuous 180 hours
The discharge index of NOx can be stablized in 100mg/Nm when system operates normally3Below；The undulate quantity of the concentration of emission of NOx is no more than
±15mg/Nm3；About 5 kgs/tonne of clinker cements of ammonium hydroxide consumption.
Not doing the part illustrated in above instructions is the prior art, or has both been able to achieve by the prior art.
Claims (9)
1. a kind of denitrating system of dry method cement rotary kiln, including reducing agent conveyor module, metering distribution module and several groups are mixed
Close jet module；It is characterized in that, the mixing jetting module is respectively arranged on the symbol of cement rotary kiln dore furnace and C5 cyclone cylinder
In the temperature range for closing SNCR reaction temperature window, make in flue gas for spraying reducing agent into dore furnace and C5 cyclone cylinder
NOx reduction generates nitrogen and water；Reducing agent conveyor module is used for the conveying of reducing agent, and metering distribution module is used for reducing agent is defeated
Send the module reducing agent that conveying comes rationed to each mixing jetting module.
2. denitrating system as described in claim 1, which is characterized in that the temperature range is 850 DEG C~1050 DEG C.
3. denitrating system as claimed in claim 1 or 2, which is characterized in that the mixing jetting module includes annular spray gun group,
The annular spray gun group includes several denitration spray guns, and the denitration spray gun is inserted radially into along dore furnace and C5 cyclone cylinder, and
It is uniformly distributed in the circumferential, the spray centerline and dore furnace of single branch spray gun and the radial line of C5 cyclone cylinder are in 5~15 ° of angles.
4. denitrating system as claimed in claim 3, which is characterized in that the denitration spray gun is two-fluid PQ-02 type spray gun, spray
The atomizing pressure of rifle is 0.5~0.8Mpa, and atomizing particle is 20~80um.
5. denitrating system as claimed in claim 3, which is characterized in that the mixing jetting module further includes successively being centered around ring
Compressed air endless tube, reducing agent endless tube and the ejected wash water endless tube of shape denitration spray gun group periphery；Compressed air endless tube by branch pipe with
The compressed air inlet connection of every denitration spray gun, for providing injection power source for spray gun, being atomized reducing agent and reaching spray
Penetrate distance；Reducing agent endless tube is connect by branch pipe with the reducing agent import of every denitration spray gun, for providing reducing agent for spray gun；
Ejected wash water endless tube is connect by branch pipe with the cleaning water inlet of every denitration spray gun, for providing cleaning water source cleaning spray gun.
6. denitrating system as claimed in claim 3, which is characterized in that the reducing agent conveyor module includes reducing agent conveying
Pump, reducing agent delivery pump are used to the reducing agent in reducing agent storage tank being delivered to denitration spray gun group by measuring distribution module.
7. denitrating system as claimed in claim 6, which is characterized in that the metering distribution module includes flowmeter, pressure change
Send device, flow control valve and branch line；The general import of the branch line is connect with the outlet of reducing agent conveyor module, and each point
The outlet of bye-pass is successively arranged flow control valve, flowmeter and pressure transmitter, the outlet of each branch line respectively with annular
The reducing agent import of spray gun group connects, and flow control valve is used to adjust the uninterrupted of the reducing agent into each annular spray gun group,
Flowmeter is used for metered flow, and pressure transmitter is used to detect the injection pressure of the reducing agent into each annular spray gun group.
8. denitrating system as claimed in claim 7, which is characterized in that further include PLC control system and setting in flue gas emission
The ammonia nitrogen concentration detector of mouth, ammonia nitrogen concentration detector, flowmeter, pressure transmitter, flow control valve and reducing agent delivery pump
It is connect respectively with PLC control system；The outlet ammonia nitrogen concentration value that ammonia nitrogen concentration detector will test is sent to PLC control system,
PLC control system controls the aperture of flow control valve according to outlet ammonia nitrogen concentration.
9. the control method of denitrating system as claimed in claim 8, which comprises the following steps:
9.1, dore furnace is set according to the factors such as the dore furnace fluid field in furnace and thermo parameters method of the different type of furnaces, fuel characteristic first
With the reducing agent allocation proportion sprayed into C5 cyclone cylinder；The NOx emission concentration of exhanst gas outlet is set according to emission request；
9.2, PLC control system compares the NOx real value and setting value of on-line checking in real time, calculates the absolute value A of the two difference；
Set the upper limit value and lower limit value of absolute difference A；
9.3, PLC control system supplies reducing agent to dore furnace and C5 cyclone cylinder respectively in the ratio of setting；When NOx real value is super
Cross setting value and absolute difference A reach the upper limit or NOx real value be not above setting value but it is on the rise when, PLC control
System controls flow control valve on the branch line for supplying dore furnace in metering distribution module first and increases aperture, increases dore furnace
The input quantity of interior reducing agent, incrementss and absolute difference A are linearly related, and absolute difference A is bigger, and incrementss are bigger；When point
Solution furnace reduction agent increase to it is a certain amount of after, outlet Nox concentration decline, absolute difference A reduce, when absolute difference A reduce
To setting lower limit when maintain current reducing agent input quantity；After reducing agent increases to maximum in dore furnace, outlet Nox concentration is still
It does not reach requirement, flow control valve on the branch line of C5 cyclone cylinder is supplied in PLC control system control metering distribution module and is added
Big aperture increases reducing agent input quantity in C5 cyclone cylinder, and incrementss and absolute difference A are linearly related, and absolute difference A is got over
Greatly, incrementss are bigger；After reducing agent increases to a certain amount of in C5 cyclone cylinder, outlet Nox concentration decline, as absolute difference A
Current reducing agent input quantity is maintained when being reduced to setting lower limit；
9.4, when NOx real value is lower than setting value and reaches the upper limit, PLC control system controls the branched pipe of C5 cyclone cylinder first
The flow control valve on road reduces aperture, reduces reducing agent input quantity in cyclone cylinder, and reduction amount and absolute difference A are linearly related,
Absolute difference A is bigger, and reduction amount is bigger；After reducing agent is reduced to a certain amount in cyclone cylinder, outlet Nox concentration rises, poor
It is worth absolute value A to reduce, maintains current reducing agent input quantity when absolute difference A is reduced to setting lower limit, setting is held time
For T1, if NOx real value is always below setting value in the T that holds time, PLC control system closes the branch of C5 cyclone cylinder
Flow control valve on pipeline stops supplying reducing agent to C5 cyclone cylinder；Flow on the branch line of dore furnace is controlled simultaneously to adjust
Valve reduces aperture, reduces reducing agent input quantity in dore furnace, reduction amount and absolute difference A are linearly related, and absolute difference A is got over
Greatly, reduction amount is bigger；After dore furnace reducing agent is reduced to a certain amount, outlet Nox concentration rises, and absolute difference A reduces, when
Absolute difference A maintains current reducing agent input quantity when being reduced to setting lower limit；
9.5, setting is held time as T2, when NOx real value is always below setting value in the T2 that holds time, downward decomposition again
Furnace reducing agent input quantity, further decreases reducing agent input quantity.
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