CN103657374A - Real-time optimizing control system and method for ammonia spraying partitions of SCR device - Google Patents
Real-time optimizing control system and method for ammonia spraying partitions of SCR device Download PDFInfo
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Abstract
The invention relates to a real-time optimizing control system and method for ammonia spraying partitions of an SCR device. The SCR device is longitudinally divided according to mounted ammonia spraying grid partitions, the corresponding inlet flue gas partition, catalyst partition and outlet flue gas partition are classified into the corresponding partitions, an oxynitride probe is mounted in the center of the corresponding partition of each of the flue gas inlet and the flue gas outlet, and all the oxynitride probes are connected with a field transmitting box through a signal line; a sampling probe is mounted in the center of every two corresponding partitions of the flue gas outlet, and all the sampling probes are connected with a semiconductor laser gas analyzer through a sampling tube; the field transmitting box and the semiconductor laser gas analyzer are connected with an industrial control computer, and the industrial control computer is used for controlling the remote electronic control valves. The data of the concentration of NO<X> of various partitions of the outlet/inlet and concentration of escaping NH3 in various partitions of the outlet is transmitted to the industrial control computer, and the data is analyzed and processed through the industrial control computer, so that the remote electric valves are accurately controlled in real time to regulate the amount of sprayed ammonia of the corresponding partitions.
Description
Technical field
The present invention relates to a kind of denitrification apparatus (SCR) spray ammonia subregion real-time optimization control system and method based on gas concentration field distribution on-line analysis.
Background technology
Selective-catalytic-reduction-based flue gas denitrifying device (SCR) is the important environmental protection facility of Shi Ge great thermal power plant at present, by spraying ammonia and catalyst by the NO in flue gas
xremove.In actual moving process, the control of ammonia spraying amount, by directly having influence on the efficiency of denitration, affects NO
xand the qualified discharge of escape ammonia, and can have influence on service life of catalyst, thus whole denitration operating cost affected.
The ammonia of SCR spray is at present controlled the main pattern that adopts overall control to regulate, by the NO of entrance
xthe data such as concentration, flue gas flow, ammonia nitrogen mol ratio and catalyst conversion efficiency calculate overall ammonia spraying amount, to entering the ammonia flow of whole ammonia-spraying grid, set, and by the NO of outlet
xconcentration is carried out feedback regulation ammonia flow.All these regulate to control based on prerequisite be: enter NO in the flue gas of SCR
xcONCENTRATION DISTRIBUTION be uniform; Each region spray ammonia of ammonia-spraying grid is uniform; The catalytic efficiency of catalyst is also uniform.But in actual moving process, due to the fluctuation of Structure Designing Problem, load, variation of equipment operating condition etc. factor all can have influence on these basic supposed premises.Therefore in actual motion, the spray ammonia automatic control system great majority of SCR device all cannot be thrown automatic operational mode, and substantially adopt the pattern of manual adjustments.But owing to lacking online monitoring means continuously, cannot truly fully understand the situation of SCR inside, manual adjustments is more by experience, with sensation, cause SCR device overall operation managerial skills lower, cause follow-up equipment maintenance to increase, operation cost is difficult to control.
The basic reason that causes the problems referred to above is the pattern that spray ammonia is controlled the overall control adjusting adopting, belong to the extensive control mode of trying to attend to big and small matters all at once, once supposed premise is false, just cannot implement accurate control, therefore adopt subregional control mode to address this problem well.
Summary of the invention
The problem that object of the present invention exists in order to overcome above-mentioned prior art, and a kind of denitrification apparatus (SCR) spray ammonia subregion real-time optimization control system and method based on gas concentration field distribution on-line analysis is provided, the present invention is by the NO of real time on-line monitoring SCR flue gas gateway
xcONCENTRATION DISTRIBUTION, and outlet escape NH
3cONCENTRATION DISTRIBUTION; By carrying out data analysis processing, draw up corresponding control strategy; Again by the ammonia spraying amount in the tele-control system corresponding spray of automatically real-time fine adjustment ammonia region.
Technical scheme of the present invention is:
Denitrification apparatus spray ammonia subregion real-time optimization control system, comprises NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem, NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem, industrial control computer, remote electrically controlled valve, described NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem comprises that nitrogen oxide is popped one's head in, on-the-spot change sent case; Described NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem comprises semiconductor laser gas analyzer, sampling probe.Each ammonia-spraying grid subregion is installed a remote electrically controlled valve, and with the ammonia-spraying grid of remote electrically controlled valve, is arranged on the smoke inlet place of denitrification apparatus SCR.It is characterized in that: the ammonia-spraying grid subregion according to installing, whole denitrification apparatus SCR is carried out to vertical partition, corresponding inlet flue gas subregion, catalyst sections, outlet flue gas subregion are put under in corresponding subregion.A nitrogen oxide probe is installed in each corresponding subregion center of smoke inlet and exhanst gas outlet, and all nitrogen oxide probes are become and send case to be connected with scene by holding wire, and on-the-spot change send case to be connected with industrial control computer.A sampling probe is installed in every two corresponding subregion centers at exhanst gas outlet, and all sampling probes are connected with semiconductor laser gas analyzer by sampling pipe, and semiconductor laser gas analyzer is connected with industrial control computer.Industrial control computer is controlled remote electrically controlled valve.
Described nitrogen oxide probe is direct insertion nitrogen oxide probe.
Described NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem adopts sampling probe to carry out multiple spot continuous sampling.
The method of denitrification apparatus spray ammonia subregion real-time optimization control system, is characterized in that carrying out according to the following steps:
Pass through NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem real-time online detects the NO in each district, SCR gateway
xcONCENTRATION DISTRIBUTION, passes through NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem real-time online detects SCRGe district outlet escape NH
3cONCENTRATION DISTRIBUTION.The NO in each district, above-mentioned gateway
xcONCENTRATION DISTRIBUTION and each district's escape of outlet NH
3the transfer of data of CONCENTRATION DISTRIBUTION to industrial control computer, by industrial control computer, carry out data analysis processing, draw up corresponding control strategy, carry out accurately to control in real time the ammonia spraying amount that remote electrically controlled valve regulates corresponding ammonia-spraying grid subregion.
By industrial control computer, gather SCR inlet flue gas NO
xreal-time concentration distribute and the data of flue gas flow rate, calculate the NO of each subregion
xdata on flows; Then according to the denitration efficiency of setting, calculate the NH of each subregion
3/ NO
xmol ratio.By collection, exporting flue gas NO
xreal-time concentration distributed data, revise the actual NH of each subregion
3/ NO
xmol ratio; And convert the valve position signal of the ammonia control valve of corresponding subregion to.
The beneficial effect of the invention:
1, the present invention can significantly reduce SCR outlet NO
xthe relative standard deviation of CONCENTRATION DISTRIBUTION, can increase substantially service life of catalyst.According to measuring and calculating SCR outlet NO
xthe every reduction by 10% of CONCENTRATION DISTRIBUTION relative standard deviation, catalyst can improve 7% service life.
2, the subregion that the present invention adopts accurately sprays the method that ammonia is controlled, and can increase substantially the utilization rate of ammonia, reduces the consumption of ammonia, directly reduces the operating cost of SCR device.
3, the present invention has improved the utilization rate of ammonia, therefore can reduce the discharge of escape ammonia.Reaching under the state of optimum control, can reduce the discharge of nearly 40% escape ammonia.
4, the present invention can improve the maximum denitration efficiency of SCR device, under the state of optimum control, can improve approximately 8% maximum denitration efficiency, the service life of further improving catalyst.
Accompanying drawing explanation
Fig. 1 is SCR device of the present invention catalytic reaction zone subregion schematic diagram.
Fig. 2 is NO of the present invention
xcONCENTRATION DISTRIBUTION on-line analysis subsystem schematic diagram.
Fig. 3 is outlet NH of the present invention
3cONCENTRATION DISTRIBUTION on-line analysis system schematic diagram.
Fig. 4 is spray ammonia subregion real-time optimization control system block diagram of the present invention.
Fig. 5 is direct insertion nitrogen oxide sonde configuration schematic diagram of the present invention.
Fig. 6 is the scheme of installation of direct insertion nitrogen oxide probe of the present invention.
The specific embodiment
The invention will be further described by reference to the accompanying drawings.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, denitrification apparatus spray ammonia subregion real-time optimization control system of the present invention, comprises NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem, NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem, industrial control computer, remote electrically controlled valve.Described NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem comprises that nitrogen oxide is popped one's head in, on-the-spot change sent case.Described nitrogen oxide probe is direct insertion nitrogen oxide probe.Described NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem comprises semiconductor laser gas analyzer, sampling probe, described NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem adopts sampling probe to carry out multiple spot continuous sampling.Each ammonia-spraying grid subregion is installed a remote electrically controlled valve, and with the ammonia-spraying grid of remote electrically controlled valve, be arranged on the smoke inlet place of denitrification apparatus SCR, it is characterized in that: according to the ammonia-spraying grid subregion of installing, whole denitrification apparatus SCR is carried out to vertical partition, by corresponding inlet flue gas subregion, catalyst sections, outlet flue gas subregion puts under in corresponding subregion, a direct insertion nitrogen oxide probe is installed in each corresponding subregion center of smoke inlet and exhanst gas outlet, all direct insertion nitrogen oxide probes are become and send case to be connected with scene by holding wire, on-the-spot change send case to be connected with industrial control computer.A sampling probe is installed in every two corresponding subregion centers at exhanst gas outlet, and all sampling probes are connected with semiconductor laser gas analyzer by sampling pipe, and semiconductor laser gas analyzer is connected with industrial control computer.Industrial control computer is controlled remote electrically controlled valve.
As shown in Figure 5, described direct insertion nitrogen oxide probe, semiconductive ceramic nitrogen oxide sensor 1, ceramic filter 2, high temperature wire 3, signal processing unit 4, high temperature protection sleeve pipe 5 and waterproof junction box 6, consist of, semiconductive ceramic nitrogen oxide sensor 1 is arranged in ceramic filter 2; High temperature wire 3 one end are connected with the extraction electrode of semiconductive ceramic nitrogen oxide sensor 1, and the other end is connected with probe signal processing unit 4; Semiconductive ceramic nitrogen oxide sensor 1, high temperature wire 3 are installed in high temperature protection sleeve pipe 5; Ceramic filter 2 links together with high warm sleeve 5; Ceramic filter 2 is arranged on the front end of probe, and probe signal processing unit 4 is arranged on probe rear end, and probe signal processing unit 4 is arranged in the terminal box 6 of a waterproof; Terminal box 6 and the protective casing 5 of waterproof link together.As shown in Figure 6, direct insertion nitrogen oxide probe, by flange connector 8, is arranged on walling of flue 7.The high warm sleeve 5 of direct insertion nitrogen oxide probe inserts in flue, makes directly contact high-temperature flue gas of semiconductive ceramic sensing element 1.
The method of denitrification apparatus spray ammonia subregion real-time optimization control system, is characterized in that carrying out according to the following steps:
Pass through NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem real-time online detects the NO in each district, SCR gateway
xcONCENTRATION DISTRIBUTION, passes through NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem real-time online detects SCRGe district outlet escape NH
3cONCENTRATION DISTRIBUTION.The NO in each district, above-mentioned gateway
xcONCENTRATION DISTRIBUTION and each district's escape of outlet NH
3the transfer of data of CONCENTRATION DISTRIBUTION to industrial control computer, by industrial control computer, carry out data analysis processing, draw up corresponding control strategy, carry out accurately to control in real time the ammonia spraying amount that remote electrically controlled valve regulates corresponding ammonia-spraying grid subregion.
Specific embodiments is as follows:
1, SCR catalytic unit system partitioning
According to the subregion of ammonia-spraying grid, whole SCR catalytic unit is carried out to vertical partition.As Fig. 1, this figure is the schematic top plan view of a catalytic reaction zone of SCR device, and 8 subregions of take are example.8 subregions according to ammonia-spraying grid, carry out subregional division by corresponding inlet flue gas, catalyst, outlet flue gas.Inlet flue gas subregion, catalyst sections and outlet flue gas subregion that ammonia-spraying grid subregion is corresponding all put same subregion under.
2, flue gas gas concentration distribution on-line detecting system
(1) measuring point is selected:
According to system partitioning, lay out the NO of entrance
xand escape NH
3the online measuring point detecting of CONCENTRATION DISTRIBUTION.The principle of arranging is NO
xmeasuring point is according to the corresponding layout of the quantity of actual subregion, and particular location is at the intermediate point of subregion.Escape NH
3the measuring point mode that can share a measuring point according to 2 subregions arrange, particular location is at the intermediate point of two subregions.As Fig. 1.
(2) outlet and entrance NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem:
This subsystem is the basic core system of whole system, the gateway NO that this subsystem detects
xconcentration real-time distribution is the base control parameter of whole control system.
Carry out NO
xthe detection of CONCENTRATION DISTRIBUTION, just must adopt multiple spot on-line measurement simultaneously.Therefore the core component of this subsystem has adopted and can directly insert in high-temperature flue, to the NO in flue gas
xcarry out the nitrogen oxide probe of continuous on-line analysis.It is existing structure that this probe adopts semiconductive ceramic gas sensor, can on-line operation in the atmosphere of high temperature high pollution, reaction speed is less than 2 seconds.Sonde configuration is simple, easy for installation, can directly insert in flue.Direct insertion nitrogen oxide probe only need to connect power supply and holding wire gets final product work, and without facilities such as sources of the gas, it is very convenient to install.The direct insertion nitrogen oxide scene of popping one's head in becomes the bus transfer pattern of sending case to adopt standard, by a pair of line, can carry out the transmission of all probe signals, has greatly simplified on-the-spot installation work.Because structure is all very simple with installation, and with low cost, be therefore applicable to very much carrying out the CONCENTRATION DISTRIBUTION detection of multiple spot.This subsystem can support at most to comprise outlet and entrance totally 24 probes carry out real-time online measuring simultaneously.The schematic diagram of this subsystem please refer to Fig. 2.
(3) outlet NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem:
This subsystem is mainly as one of reference parameter of assessment spray ammonia optimal control effect.By this parameter in conjunction with outlet NO
xcONCENTRATION DISTRIBUTION, can pass judgment on the effect of spray ammonia optimal control, to controlling parameter, further optimize.This group parameter, as evaluate parameter, does not participate in real-time control, and real-time is not had to too high request.
What this subsystem adopted is the semiconductor laser on-line analysis subsystem of multipoint circulation sample mode.Core component is semiconductor laser gas analyzer.System adopts multipoint circulation sampling, and omnidistance high temperature is accompanied hot sample mode, at most can 6 points of continuous on-line detection.This subsystem schematic diagram please refer to Fig. 3.
3, the executing agency of control system
The control valve of ammonia-spraying grid subregion is all transformed into remote electrically controlled valve, can remote electrically controlledly regulates.
4, industrial control computer
The control signal access industrial of all detection signals and remote electrically controlled valve is controlled to computer.The control software that industrial control computer is installed adopts WINCC or KingView industrial configuration software, and SQLserver database software, is existing control software.Software carries out analyzing and processing to the parameters of input, by corresponding algorithm, calculates control strategy, and is converted into the subregion control that each aperture signal that sprays ammonia subregion control valve is realized spray ammonia.As Fig. 4
5, spray ammonia subregion real-time optimization is controlled software:
The software that industrial control computer uses mainly contains industrial configuration software and two kinds of basic softwares of relational data library software.Configuration software mainly adopts WINCC software or KingView software, and database software mainly adopts SQL server software.
By industrial control computer hardware, gather SCR inlet flue gas NO
xreal-time concentration distribute and the data of flue gas flow rate, by software, calculate the NO of each subregion
xdata on flows.Then according to the denitration efficiency of setting, calculate the NH of each subregion
3/ NO
xmol ratio.At the collection outlet flue gas NO by hardware
xreal-time concentration distributed data, revise the actual NH of each subregion
3/ NO
xmol ratio.And convert the valve position signal of the ammonia control valve of corresponding subregion to, be transferred to the adjusting that valve regulated mechanism carries out valve opening.
Claims (5)
1. denitrification apparatus spray ammonia subregion real-time optimization control system, comprises NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem, NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem, industrial control computer, remote electrically controlled valve, described NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem comprises that nitrogen oxide is popped one's head in, on-the-spot change sent case, described NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem comprises semiconductor laser gas analyzer, sampling probe; Each ammonia-spraying grid subregion is installed a remote electrically controlled valve, and with the ammonia-spraying grid of remote electrically controlled valve, is arranged on the smoke inlet place of denitrification apparatus SCR; It is characterized in that: the ammonia-spraying grid subregion according to installing, whole denitrification apparatus SCR is carried out to vertical partition, corresponding inlet flue gas subregion, catalyst sections, outlet flue gas subregion are put under in corresponding subregion; A nitrogen oxide probe is installed in each corresponding subregion center of smoke inlet and exhanst gas outlet, and all nitrogen oxide probes are become and send case to be connected with scene by holding wire, and on-the-spot change send case to be connected with industrial control computer.A sampling probe is installed in every two corresponding subregion centers at exhanst gas outlet, and all sampling probes are connected with semiconductor laser gas analyzer by sampling pipe, and semiconductor laser gas analyzer is connected with industrial control computer; Industrial control computer is controlled remote electrically controlled valve.
2. denitrification apparatus spray ammonia subregion real-time optimization control system according to claim 1, is characterized in that: described nitrogen oxide probe is direct insertion nitrogen oxide probe.
3. denitrification apparatus spray ammonia subregion real-time optimization control system according to claim 1, is characterized in that: described NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem adopts sampling probe to carry out multiple spot continuous sampling.
4. utilize the described method based on denitrification apparatus spray ammonia subregion real-time optimization control system of one of claim 1-3, it is characterized in that carrying out according to the following steps:
Pass through NO
xcONCENTRATION DISTRIBUTION on-line analysis subsystem real-time online detects the NO in each district, SCR gateway
xcONCENTRATION DISTRIBUTION, passes through NH
3cONCENTRATION DISTRIBUTION on-line analysis subsystem real-time online detects SCRGe district outlet escape NH
3cONCENTRATION DISTRIBUTION, the NO in each district, above-mentioned gateway
xcONCENTRATION DISTRIBUTION and each district's escape of outlet NH
3the transfer of data of CONCENTRATION DISTRIBUTION to industrial control computer, by industrial control computer, carry out data analysis processing, draw up corresponding control strategy, carry out accurately to control in real time the ammonia spraying amount that remote electrically controlled valve regulates corresponding ammonia-spraying grid subregion.
5. the method for denitrification apparatus spray ammonia subregion real-time optimization control system according to claim 4, is characterized in that: by industrial control computer, gather SCR inlet flue gas NO
xreal-time concentration distribute and the data of flue gas flow rate, calculate the NO of each subregion
xdata on flows; Then according to the denitration efficiency of setting, calculate the NH of each subregion
3/ NO
xmol ratio; By collection, export flue gas NO again
xreal-time concentration distributed data, revise the actual NH of each subregion
3/ NO
xmol ratio; And convert the valve position signal of the ammonia control valve of corresponding subregion to.
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