CN206322002U - The denitration automatic control system of heat accumulating gas boiler - Google Patents
The denitration automatic control system of heat accumulating gas boiler Download PDFInfo
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- CN206322002U CN206322002U CN201621377394.3U CN201621377394U CN206322002U CN 206322002 U CN206322002 U CN 206322002U CN 201621377394 U CN201621377394 U CN 201621377394U CN 206322002 U CN206322002 U CN 206322002U
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Abstract
The utility model discloses a kind of denitration automatic control system of heat accumulating gas boiler, heat accumulating gas boiler is provided with burner and denitration nozzle.Denitration automatic control system includes solution transport subsystem, compressed air transport subsystem and control subsystem, and solution transport subsystem includes Agitation Tank, NaOH solution tank NaOH, solution pressure storage tank, solution electromagnetic valve, solution transfer pump and solution pressure pump；Compressed air transport subsystem includes compressed air reservoir and compressed air electromagnetic valve；Control subsystem includes flue gas analyzer, temperature, pressure detection piece, frequency converter and PLC system, frequency converter is connected to adjust the rotating speed of solution pressure pump by frequency conversion with solution pressure pump, PLC system controls the frequency of frequency converter after data analysis is carried out to the temperature value of reception, pressure value and amount of nitrogen oxides value.Denitration automatic control system of the present utility model, takes unique control for the special construction of heat storage type combustion, realizes automation denitration.
Description
Technical field
The utility model is related to the out of stock field of purification of flue gas, automatic more particularly, to a kind of denitration of heat accumulating gas boiler
Control system.
Background technology
With the development of modern industrialization, air pollution also aggravates therewith, the waste gas of the burning generation of a large amount of fossil fuel
Cause inevitable environmental pollution.Especially nitrogen oxides as wherein primary product, can directly to human respiratory, in
Pivot nervous system, cardiovascular system etc. produce harm；Nitrogen oxides is combined with the water in air eventually changes into nitric acid and nitre
Hydrochlorate, nitric acid is one of origin cause of formation of acid rain, and acid rain can make the crops significantly underproduction, and protein content and crop yield decline, acid
Rain can make forest and other plant leaf is withered and yellow, pest and disease damage is aggravated, final Large Scale Death；Nitrogen oxides exists with other pollutants
Under certain condition, photochemical pollution can be produced.In a word, the pollution of nitrogen oxides directly or indirectly endanger health,
The ecosystem and Architectural Equipment.
Regenerative combustion technology is completed out kiln gas by the heat storage being placed in burner and enters stove combustion air
Heat exchange, heat-accumulating burner mounted in pairs is in stove both sides, and every a pair of heat-accumulating burners are all a fired states, another row
Cigarette state, heat is absorbed and stored by heat storage when flue gas flows through regenerator, and the temperature for the flue gas discharged from afterbody substantially drops
It is low.Combustion air enters from regenerator afterbody, from head discharge.Heat storage heat release when air flows through regenerator, heat is by air
Absorb so that air is heated into high temperature (only lower than high-temperature flue-gas 50 DEG C~100 DEG C), the air after heating participates in burning.It is fixed
Shi Jinhang commutates, and the burner burnt originally is discharged fume, and the burner combustion discharged fume originally, constantly goes round and begins again.
Heat accumulating type high temperature air combustion technology has following features：The thermal efficiency of various industrial furnaces or boiler is improved, it is average
Energy-conservation more than 30% with reach improve the stove thermal efficiency, energy-saving and emission-reduction effect；Exhaust gas temperature is low, and waste heat recovery is not needed substantially
System；Improve the temperature homogeneity in various industrial furnaces or boiler furnace；By various low heat values or inferior fuel high quality, save
High-grade fuel；Reduce discharge of pernicious gas such as carbon dioxide and nitrogen oxides etc..
Heat accumulating type high temperature air combustion technology, is widely used at present various fuel oils in steam and hot water power industry, combustion gas
In boiler, be also widely used in metallurgical machinery sector various heating furnaces, the various kilns of building material industry, chemical industry it is various
In tubular heater and the various industrial furnaces of other industries.
Many bodies of heater can be applied to denitration control technology to control the content of nitrogen oxides in smoke evacuation, but existing denitration control
Technology processed is not suitable with the denitrating system of regenerative gas stove, because that can cause denitration insufficient, or even runs counter to desire and cause two
Secondary pollution, threatens the personal safety of administrative staff.
Utility model content
The application is intended at least solve one of technical problem present in prior art.Therefore, the utility model is intended to
A kind of denitration automatic control system of heat accumulating gas boiler is provided, nitrogen oxygen in the flue gas to reduce heat accumulating gas boiler discharge
The content of compound.
According to the denitration automatic control system of heat accumulating gas boiler of the present utility model, heat accumulating gas boiler is provided with
It is described that correspondence is additionally provided with the burner of multiple alternate combustions, one heat storage of each burner correspondence, the heat accumulating gas boiler
Multiple denitration nozzles that multiple burners are set；The denitration automatic control system includes：Solution transport subsystem, compressed air are defeated
Subsystem and control subsystem are sent, wherein, the solution transport subsystem includes：Agitation Tank, NaOH solution tank NaOH, solution pressure storage tank,
Multiple solution electromagnetic valves, solution transfer pump and solution pressure pump, the Agitation Tank are used to contain denitrfying agent, the solution transfer pump
For denitrfying agent in the Agitation Tank to be delivered into the NaOH solution tank NaOH, the solution pressure pump is used for denitration in the NaOH solution tank NaOH
Agent is delivered to the solution pressure storage tank, and the multiple solution electromagnetic valve is connected with the multiple denitration nozzle respectively；The pressure
Contracting air transport subsystem includes：Compressed air reservoir and multiple compressed air electromagnetic valves, the compressed air reservoir pass through institute
State multiple compressed air electromagnetic valves respectively with the multiple denitration nozzle to be connected, the compression at each denitration nozzle is empty
Pneumoelectric magnet valve and the solution electromagnetic valve synchro switch, the compressed air electromagnetic valve are opened with the corresponding solution electromagnetic valve
When compressed air denitrfying agent is atomized after spray to the burner hearth of the heat accumulating gas boiler；The control subsystem includes：
Flue gas analyzer, temperature detection part, pressure detecting part, frequency converter and PLC system, the flue gas analyzer are used to analyze from multiple
The nitrogen oxides in effluent content of discharge in the heat storage, the temperature detection part be used to detect in multiple heat storages and
Temperature in the burner hearth, the pressure detecting part is used to detect the pressure in the burner hearth, the flue gas analyzer, temperature inspection
Survey part and the pressure detecting part is connected with the PLC system respectively, the frequency converter is connected with the solution pressure pump with logical
The rotating speed that frequency conversion adjusts the solution pressure pump is crossed, the PLC system is connected with the frequency converter, and the PLC system is in docking
Temperature value, pressure value and the amount of nitrogen oxides value of receipts are carried out after data analysis, control the frequency of the frequency converter.
According to the denitration automatic control system of the heat accumulating gas boiler of the utility model embodiment, for heat storage type combustion
Special construction take the control method of uniqueness, ensured using PLC system as core in the denitration automatic control system
System is normally run, and solution electromagnetic valve and frequency converter perform specific action as actuator；According to boiler temperature, regenerator temperature
With out of stock dose of usage amount of flue gas nitrogen oxide content dynamic regulation, it is to avoid cause secondary pollution, possess intelligence, stably, safely,
Efficiently, the characteristics of controlling accurate, realizes the automatically working of denitration.
In certain embodiments, the control subsystem also includes：Relay, the relay and the solution transfer pump
It is connected to control the switch of the solution transfer pump, the PLC system is connected to control the relay with the relay
Operation；Flow transmitter, the flow transmitter is located between the solution pressure storage tank and the multiple solution electromagnetic valve, institute
Flow transmitter is stated to electrically connect with the PLC system.
In certain embodiments, the solution transport subsystem also includes：Overflow valve, the import series connection of the overflow valve connects
It is connected between the solution pressure pump and the solution pressure storage tank, the outlet of the overflow valve is connected with the NaOH solution tank NaOH.
In certain embodiments, sensed between the import of the solution pressure pump and the overflow valve provided with first pressure
Device, the first pressure sensor is electrically connected with the PLC system.
In certain embodiments, the solution pressure storage tank is provided with second pressure sensor, the second pressure sensing
Device is electrically connected with the PLC system.
In certain embodiments, the NaOH solution tank NaOH is provided with above and below solution level bound detection piece, the solution level
Limit detection piece is electrically connected with PLC system, and the PLC system is delivered to the denitration in the NaOH solution tank NaOH by the Control
Agent flux.
In certain embodiments, the Agitation Tank, which is provided with, matches somebody with somebody liquid liquid level lower limit detection piece, and the denitration, which is automatically controlled, is
System also includes alarm, described to be electrically connected with liquid liquid level lower limit detection piece with the alarm.
In certain embodiments, provided with the 3rd pressure between the compressed air reservoir and the multiple compressed air electromagnetic valve
Force snesor, the 3rd pressure sensor is electrically connected with the PLC system.
In certain embodiments, stop valve is provided between the compressed air reservoir and the 3rd pressure sensor.
In certain embodiments, the pressure detecting part is the 4th pressure sensor, and the temperature detection part includes detection
First thermocouple of each accumulation of heat body temperature and the second thermocouple for detecting temperature in the burner hearth.
Additional aspect and advantage of the present utility model will be set forth in part in the description, partly by from following description
In become obvious, or by it is of the present utility model practice recognize.
Brief description of the drawings
Of the present utility model above-mentioned and/or additional aspect and advantage will from description of the accompanying drawings below to embodiment is combined
Become substantially and be readily appreciated that, wherein：
Fig. 1 is the structural representation of the denitration automatic control system according to the heat accumulating gas boiler of the utility model embodiment
Figure.
Fig. 2 is each system control in the denitration automatic control system according to the heat accumulating gas boiler of the utility model embodiment
The structural representation of relation processed.
Reference：
Heat accumulating gas boiler 100, heat storage 2, the first heat storage 21, the second heat storage 22, the 3rd heat storage the 23, the 4th
Heat storage 24, denitration nozzle 3, the first denitration nozzle 31, the second denitration nozzle 32, the 3rd denitration nozzle 33, the first denitration nozzle
34、
Denitration automatic control system 200,
It is solution transport subsystem 210, Agitation Tank 211, solution transfer pump 212, NaOH solution tank NaOH 213, solution pressure pump 214, molten
Hydraulic coupling storage tank 215, solution electromagnetic valve 216, the first solution stop valve 2161, the second solution stop valve 2162, the 3rd solution are cut
Disconnected valve 2163, the 4th solution stop valve 2164, overflow valve 217,
Compressed air transport subsystem 220, compressed air reservoir 221, compressed air electromagnetic valve 222, the cut-out of the first air
Valve 2221, the second air cutoff valve 2222, the 3rd air cutoff valve 2223, the 4th air cutoff valve 2224, stop valve 223,
Control subsystem 230, flow transmitter 231, flue gas analyzer 232, temperature detection part 233, regenerator temperature inspection
Survey part 2331, the first regenerator temperature detection piece 23311, the second regenerator temperature detection piece 23312, the inspection of the 3rd regenerator temperature
Survey part 23313, the 4th regenerator temperature detection piece 23314, in-furnace temperature detection piece 2332, pressure detecting part 234, frequency converter
235th, relay 236, PLC system 237,
First pressure sensor 241, second pressure sensor 242, solution level bound detection piece 243, solution level
The upper limit 2431, solution level lower limit 2432, with liquid liquid level lower limit detection piece 244, the 3rd pressure sensor 245,
Industrial PC 300,
Chimney 400,
Embodiment
Embodiment of the present utility model is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element or element with same or like function are represented to same or similar label eventually.Below by ginseng
The embodiment for examining accompanying drawing description is exemplary, it is intended to for explaining the utility model, and it is not intended that to the utility model
Limitation.
Automatically controlled below with reference to Fig. 1-Fig. 2 descriptions according to the denitration of the heat accumulating gas boiler of the utility model embodiment
System 200.
Heat accumulating gas boiler 100 is provided with the burner of multiple alternate combustions, and one heat storage 2 of each burner correspondence stores
Multiple denitration nozzles 3 that the multiple burners of correspondence are set are additionally provided with hot type gas fired-boiler 100.Part burner is lighted in multiple burners
After burning, the corresponding denitration nozzle 3 of burner of burning is opened, not corresponding denitration nozzle 3 is closed, the denitration nozzle 3 of opening to
Flue gas injection denitration agent solution in burner hearth, to absorb in the nitrogen oxides in flue gas, the flue gas that reduction boiler 100 is finally discharged
The content of nitrogen oxides.Explanation is needed exist for, a burner can correspond to one or more denitration nozzle 3, a denitration
Nozzle 3 can also correspond to one or more burner, be not specifically limited here.
According to the denitration automatic control system 200 of the heat accumulating gas boiler of the utility model embodiment, as shown in figure 1,
Including：Solution transport subsystem 210, compressed air transport subsystem 220 and control subsystem 230.This hierarchical approaches, be by
Two strip transmission lines of denitration agent solution and conveying compressed air are conveyed respectively as a subsystem, then by the inspection to each part
Survey, analyze, control section is individually classified as a control subsystem 230.
Wherein, solution transport subsystem 210 includes：Agitation Tank 211, NaOH solution tank NaOH 213, solution pressure storage tank 215, Duo Gerong
Liquid electromagnetic valve 216, solution transfer pump 212 and solution pressure pump 214, Agitation Tank 211 are used to contain denitrfying agent, solution transfer pump
212 are used to denitrfying agent in Agitation Tank 211 being delivered to NaOH solution tank NaOH 213, and solution pressure pump 214 is used for denitration in NaOH solution tank NaOH 213
Agent is delivered to solution pressure storage tank 215, and multiple solution electromagnetic valves 216 are connected with multiple denitration nozzles 3 respectively.
Millworker can directly pour into denitration agent solution in Agitation Tank 211, the conveying of denitrfying agent afterwards, traffic management and control,
Injection will be completed by solution transport subsystem 210.Denitrfying agent by solution transfer pump 212 in Agitation Tank 211 by being pumped into NaOH solution tank NaOH
In 213, terminal of the NaOH solution tank NaOH 213 equivalent to denitrfying agent.Denitrfying agent is delivered to by solution pressure pump 214 in NaOH solution tank NaOH 213
In solution pressure storage tank 215 so that liquid reaches certain hydraulic pressure in solution pressure storage tank 215.Solution pressure storage tank 215 connects afterwards
Connect the injection for controlling denitrfying agent at multiple denitration nozzles 3, each denitration nozzle 3 by a solution electromagnetic valve 216.Due to solution
Solution has the solution in certain hydraulic pressure, therefore solution pressure storage tank 215 can the multiple solution electromagnetism of automatic stream in pressure vessel 215
Valve 216, after solution electromagnetic valve 216 is opened, denitrfying agent it is sprayable go out.
Compressed air transport subsystem 220 includes：Compressed air reservoir 221 and multiple compressed air electromagnetic valves 222, compression
Air reservoir 221 is connected with multiple denitration nozzles 3 respectively by multiple compressed air electromagnetic valves 222.Due to compressed air reservoir
After 221 compressed air air pressure are larger, therefore compressed air electromagnetic valve 222 is opened, pressure air can be automatically at denitration nozzle 3
Eject.Compressed air is passed through at denitration nozzle 3, is that the denitration agent solution of ejection is subjected to mist using the high pressure of compressed air
Change, therefore the compressed air electromagnetic valve 222 at each denitration nozzle 3 needs synchro switch with solution electromagnetic valve 216, so, pressure
After denitrfying agent is atomized by compressed air when contracting air solenoid valve 222 is opened with corresponding solution electromagnetic valve 216, spray to heat accumulating type
In the burner hearth of gas fired-boiler 100.
Control subsystem 230 includes：Flue gas analyzer 232, temperature detection part 233, pressure detecting part 234, frequency converter 235
With PLC system 237, flue gas analyzer 232 is used for the nitrogen oxides in effluent content for analyzing the discharge out of multiple heat storages 2, temperature
Degree detection piece 233 is used to detect in multiple heat storages 2 and temperature in burner hearth that pressure detecting part 234 to be used to detect pressure in the burner hearth,
Flue gas analyzer 232, temperature detection part 233 and pressure detecting part 234 are connected with PLC system 237 respectively, frequency converter 235 with it is molten
Hydraulic coupling pump 214 is connected to adjust the rotating speed of solution pressure pump 214 by frequency conversion, and PLC system 237 is connected with frequency converter 235,
PLC system 237 controls frequency converter 235 after data analysis is carried out to the temperature value of reception, pressure value and amount of nitrogen oxides value
Frequency.
It is understood that whether the nitrogen oxides in effluent content discharged of boiler 100 directly to reflect denitrfying agent abundant
Absorbing temperature in nitrogen oxides, heat storage 2 can reflect that pressure can be anti-in the accumulation of heat situation of boiler 100 and combustion case, boiler 100
The safety issue of the burning of boiler 100 is reflected, therefore according to the emitted dose of these three parameter regulation denitrfying agents, can not only be beneficial to reduction
The content of nitrogen oxides in smoke evacuation, moreover it is possible to avoid the denitrfying agent sprayed into from having a negative impact the fuel combustion of boiler 100, in addition
Also ensure that air pressure is maintained in normal pressure limit in boiler 100.For example, when amount of nitrogen oxides in the smoke evacuation of boiler 100
When higher, the straying quatity of denitrfying agent can be increased；Otherwise then reduce the straying quatity of denitrfying agent.For example, pressure is higher in boiler 100
When, it is desirable to reduce emitted dose, reduce furnace pressure；Otherwise then need to increase emitted dose.Certainly, under the influence of multiple parameters, how
The straying quatity of denitrfying agent is adjusted, will be calculated, be not especially limited here according to the PLC algorithms under practical situations.
PLC system 237 changes solution in real time by the parameter of the collection in worksite such as amount of nitrogen oxides, boiler temperature, furnace pressure
The pressure of pressure vessel 215 changes the straying quatity of denitrfying agent, so as to realize automatically controlling for denitrating system.
According to the denitration automatic control system 200 of the heat accumulating gas boiler of the utility model embodiment, for heat accumulating type
The special construction of burning, which takes, uses the conduct of PLC system 237 in the control method of uniqueness, the denitration automatic control system 200
Core is carried out safeguards system and normally run, and solution electromagnetic valve 216 and frequency converter 235 perform specific action as actuator；According to pot
The usage amount of stove furnace temperature, regenerator temperature and out of stock dose of flue gas nitrogen oxide content dynamic regulation, it is to avoid cause secondary pollution, tool
Standby intelligence, stably, it is safe efficient, the characteristics of control accurate, realize the automatically working of denitration.
In addition, staff can in real time be monitored to the various parameters in denitrification process, this programme is highly integrated, fits
For regenerative gas system, also there is splendid reference function for polytype industrial fuel gas heating furnace.
In some embodiments of the present utility model, as shown in figure 1, control subsystem 230 also includes：Relay 236, after
Electrical equipment 236 is connected with solution transfer pump 212 to control the switch of solution transfer pump 212, and PLC system 237 is connected with relay 236
With the operation of control relay 236.So, liquid can be by the control automatic transport of control subsystem 230 extremely in Agitation Tank 211
In NaOH solution tank NaOH 213.Certainly, the switch of solution transfer pump 212 can be by other modes control, such as time opening.
In certain embodiments, as shown in figure 1, control subsystem 230 also includes：Flow transmitter 231, flow transmitter
231 are located between solution pressure storage tank 215 and multiple solution electromagnetic valves 216, and flow transmitter 231 is electrically connected with PLC system 237
Connect, the flow of the detectable denitrfying agent for flowing to multiple solution electromagnetic valves 216 of flow transmitter 231.Here flow transmitter is passed through
231 detection data, can be easy to the aggregated flows parameter of PLC system 237, further the conveying of accurate adjustment solution pressure pump 214
Amount.
Specifically, in solution transport subsystem 210, each solution electromagnetic valve 216 is solution stop valve.
In certain embodiments, as shown in figure 1, solution transport subsystem 210 also includes：Overflow valve 217, overflow valve 217
Import be connected in series between solution pressure pump 214 and solution pressure storage tank 215, the outlet of overflow valve 217 and NaOH solution tank NaOH 213
It is connected.So, it can reach pressure stabilization function so that solution flowing is stable between solution pressure pump 214 and solution pressure storage tank 215.
In certain embodiments, as shown in figure 1, provided with the first pressure between the import of solution pressure pump 214 and overflow valve 217
Force snesor 241, first pressure sensor 241 is electrically connected with PLC system 237.So, solution pressure pump 214 can be detected in real time
The solution hydraulic pressure of solution pressure storage tank 215 is pumped into, is easy to PLC system 237 to improve control accuracy.
In certain embodiments, as shown in figure 1, solution pressure storage tank 215 is provided with second pressure sensor 242, second
Pressure sensor 242 is electrically connected with PLC system 237.So, solution pressure in solution pressure storage tank 215 can be detected in real time, be easy to
PLC system 237 improves control accuracy.
In certain embodiments, NaOH solution tank NaOH 213 is provided with solution level bound detection piece 243, solution level bound
Detection piece 243 is electrically connected with PLC system 237, and PLC system 237 controls to be delivered to de- in NaOH solution tank NaOH 213 by relay 236
Nitre agent flux.
Specifically, solution level bound detection piece 243 includes：The solution level upper limit 2431 and solution level lower limit
2432, when the solution level upper limit 2431 detects that solution level is higher than higher limit in NaOH solution tank NaOH 213, controlled by PLC system 237
Solution transfer pump 212 processed stops conveying；When solution level lower limit 2432 detects that solution level is less than lower limit in NaOH solution tank NaOH 213
When, control solution transfer pump 212 to start by PLC system 237 and operate.So, amount of solution can be avoided in NaOH solution tank NaOH 213 less and
Cause the situation of cutout, also avoid the problem of amount of solution excessively causes hypertonia in NaOH solution tank NaOH 213.
In certain embodiments, Agitation Tank 211, which is provided with, matches somebody with somebody liquid liquid level lower limit detection piece 244, denitration automatic control system
200 also include alarm, are electrically connected with liquid liquid level lower limit detection piece 244 with alarm.It can so remind millworker timely
Make-up solution.
In the compressed air transport subsystem 220 of the utility model embodiment, each compressed air electromagnetic valve 222 is
Air cutoff valve.
In certain embodiments, as shown in figure 1, being set between compressed air reservoir 221 and multiple compressed air electromagnetic valves 222
Have the 3rd pressure sensor 245, the 3rd pressure sensor 245 is electrically connected with PLC system 237, so can when detect that compression is empty in fact
The air pressure that gas storage tank 221 is discharged, in favor of regulation compressed air straying quatity.
In certain embodiments, cut as shown in figure 1, being provided between the pressure sensor 245 of compressed air reservoir 221 and the 3rd
Disconnected valve 223.The setting of stop valve 223 herein, can close compressed air reservoir 221, it is ensured that system when boiler 100 shuts down
Safety in operation.
In embodiment of the present utility model, pressure detecting part 234 is the 4th pressure sensor, and temperature detection part 233 is wrapped
Include for detecting in each heat storage 2 the regenerator temperature detection piece 2331 of temperature and warm in the stove of temperature for detecting in burner hearth
Spend detection piece 2332.
Alternatively, regenerator temperature detection piece 2331 and in-furnace temperature detection piece 2332 are thermocouple.
In the utility model embodiment, as shown in figure 1, each heat storage 2 is connected with chimney 400, the flue gas of discharge
Arranged at chimney 400 to air, flue gas analyzer 232 is connected to the row of boiler 100 on the pipeline of chimney 400.
In Fig. 1 specific embodiment, heat accumulating gas boiler 100 includes four burners, is correspondingly provided with four heat storages
2, this four heat storages 2 are respectively the first heat storage 21, the second heat storage 22, the 3rd heat storage 23 and the 4th heat storage 24.Pot
Four denitration nozzles 3 are additionally provided with stove, this four denitration nozzles 3 are respectively the first denitration nozzle 31, the second denitration nozzle 32, the
Three denitration nozzles 33 and the first denitration nozzle 34.
In temperature detection part 233, the regenerator temperature detection piece 2331 of four heat storages 2 of correspondence is respectively：First accumulation of heat
Temperature detection piece 23311, the second regenerator temperature detection piece 23312, the 3rd regenerator temperature detection piece 23313 and the 4th store
Hot temperature detection piece 23314.This four regenerator temperature detection pieces 2331 and in-furnace temperature detection piece 2332 are thermoelectricity
It is even.
At four denitration nozzles 3, four solution electromagnetic valves 216 are corresponded to respectively, and this four solution electromagnetic valves 216 are respectively
First solution stop valve 2161, the second solution stop valve 2162, the 3rd solution stop valve 2163 and the 4th solution stop valve 2164；
Four compressed air electromagnetic valves 222 are corresponded to respectively, and this four compressed air electromagnetic valves 222 are respectively the first air cutoff valve
2221st, the second air cutoff valve 2222, the 3rd air cutoff valve 2223 and the 4th air cutoff valve 2224.
, can also be by the control of the denitration automatic control system 200 of heat accumulating gas boiler in the utility model embodiment
The relation hierarchy of preparative layer level.
As in one embodiment as shown in figure 2,200 points of denitration automatic control system is three parts：
First, master system is made up of Industrial PC 300, including：The input equipments such as display, main frame and keyboard；
2nd, PLC system 237, including：Power module, CPU module, data signal input module, data signal output mould
Block, analog signalses input module, analog signalses output module etc.；
3rd, field instrument and executing agency, including：Solution pressure detection piece, flow transmitter 231, flue gas analyzer
232nd, Agitation Tank 211 match somebody with somebody liquid liquid level lower limit detection piece 244, the solution level bound detection piece 243 of NaOH solution tank NaOH 213, boiler
Temperature detection part 233, the furnace pressure detection piece 234 of boiler 100, the first regenerator temperature detection piece 23311, in 100 burner hearths
Two regenerator temperature detection pieces 23312, the 3rd regenerator temperature detection piece 23313, the 4th regenerator temperature detection piece 23314,
First solution stop valve 2161, the second solution stop valve 2162, the 3rd solution stop valve 2163, the 4th solution stop valve 2164,
First air cutoff valve 2221, the second air cutoff valve 2222, the 3rd air cutoff valve 2223, the 4th air cutoff valve 2224,
Frequency converter 235, solution pressure pump 214, relay 236 and solution transfer pump 212.
Field instrument and executing agency's installation site are according to as shown in figure 1, all field instruments and executing agency are all connected with
PLC system 237, PLC system 237 connects Industrial PC 300 by data communication line, and the operation of system is independent of Industrial PC 300.Compile
The monitoring programme of the control program of PLC system 237 and host computer Industrial PC 300 processed, the program of PLC system 237 reads field instrument
Return value, the operation of the live executing agency of control, solution pressure pump 214 controlled by frequency converter 235, passes through relay 236
Control solution transfer pump 212.Industrial PC 300 is as monitor, and detection and record related data and alarm are in case inquiry.
During system operation, the denitrfying agent for having configured concentration is added into Agitation Tank 211 first, PLC system 237 passes through relay
Solution in Agitation Tank 211 is transported in NaOH solution tank NaOH 213 by 236 control solution transfer pumps 212, works as NaOH solution tank NaOH during normal operation
When liquid level of solution is less than lower limit in 213, solution transfer pump 212 automatically turns on to NaOH solution tank NaOH 213 and conveys solution, when NaOH solution tank NaOH 213
When interior liquid level is higher than the upper limit, solution transfer pump 212 stops, and solution is less than lower limit alarm prompting filling solution in Agitation Tank 211.
Denitration agent solution is injected in solution pressure storage tank 215 by solution pressure pump 214, and solution passes through solution pressure storage tank
Excessively stream transmitter 231 is connected with solution electromagnetic valve 216 after 215.When needing denitration, corresponding solution electromagnetic valve 216 and pressure
Contracting air solenoid valve 222 is opened, and compressed air will be sprayed onto in high-temperature flue gas after denitrfying agent solution atomization, realizes the mesh of denitrating flue gas
's.
The purpose of efficient burning is reached due to the constantly commutation of heat storage type combustion needs, out of stock nozzle needs and boiler combustion
System progress is chain, the both sides of heat accumulating type boiler 100 such as is respectively defined as into A sides and B sides, then when A sides burner works
A sides denitration nozzle 3 is opened, B sides denitration nozzle 3 is opened when B sides burner works.Reversal valve when being commutated due to boiler 100
Switch has certain delay, so the problem of considering delay when opening denitration nozzle 3.
Flue gas nitrogen oxide content is gathered by flue gas analyzer 232, and the fire box temperature of boiler 100 is adopted by hearth thermocouple
Collection, the temperature of heat storage 2 is transferred to PLC system 237 respectively by the thermocouple on heat storage 2.Calculated, will counted by internal processes
Calculate result and send frequency converter 235, the frequency of frequency converter 235 to as the input quantity communication of the frequency converter 235 of solution pressure pump 214
The rotating speed of compression pump is influenceed, and the rotating speed of compression pump can directly change the pressure size of solution pressure storage tank 215, and then change spray
The amount for the denitrfying agent being mapped in burner hearth, realizes the input quantity of precise control denitrfying agent, that is, the purpose for reaching denitration is not resulted in again
Produce because the use of excessive denitrfying agent causes secondary pollution.The frequency of frequency converter 235 is with nitrogen oxides in flue gas analyzer 232
The change of content and the temperature of thermocouple measurement heat storage 2 in dynamic change, heat storage 2, it is ensured that the thermal efficiency of whole boiler 100
It will not reduce.
When the liquid level lower limit triggering of NaOH solution tank NaOH 213, it is molten by the automatic of relay 236 that PLC system 237 sends instruction
Liquid delivery pump 212, denitration agent solution is filled from Agitation Tank 211 to NaOH solution tank NaOH 213, and the liquid level of NaOH solution tank NaOH 213 is reached when liquid level rises
During the upper limit, PLC system 237 sends instruction and is automatically stopped solution transfer pump 212.When the liquid level lower limit triggering of Agitation Tank 211,
PLC system 237 sends instruction and is automatically stopped solution transfer pump 212, while sound and light alarm prompting operating personnel's configuration filling denitration
Agent solution.
Other numerical value can in real time be monitored by host computer, ensure the stable operation of equipment.The pressure of solution pressure storage tank 215
Power, the flow of denitration solution, furnace temperature, furnace pressure, regenerator temperature, the content of the nitrogen oxides of flue gas analyzer 232, compressed air
Pressure, the on off state of each electromagnetic pneumatic valve, and the running status of whole system can pass through Computer display
Device is shown.
Whole system is desirably integrated into boiler 100 control system of itself, can also be run as an autonomous system,
It is convenient, flexible, it is convenient to carry out.
In description of the present utility model, it is to be understood that term " " center ", " on ", " under ", " vertical ", " level ",
The orientation or position relationship of the instruction such as " top ", " bottom ", " interior ", " outer " are
Described for the ease of description the utility model and simplifying, rather than to indicate or imply that signified device or element must have specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.
In addition, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance
Or the implicit quantity for indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include one or more this feature.In description of the present utility model, unless otherwise indicated, the implication of " multiple "
It is two or more.
In description of the present utility model, unless otherwise clearly defined and limited, term " installation ", " connected ", " company
Connect ", " fixation " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integrally；Can be
Mechanically connect or electrically connect；Can be joined directly together, can also be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements.For the ordinary skill in the art, can be specific
Situation understands concrete meaning of the above-mentioned term in the utility model.
In the description of this specification, the description of reference term " embodiment ", " example " etc. mean to combine the embodiment or
Specific features, structure, material or the feature of example description are contained at least one embodiment of the present utility model or example.
In this manual, identical embodiment or example are not necessarily referring to the schematic representation of above-mentioned term.Moreover, description
Specific features, structure, material or feature can in an appropriate manner be tied in any one or more embodiments or example
Close.
While there has been shown and described that embodiment of the present utility model, it will be understood by those skilled in the art that：
These embodiments can be carried out with a variety of changes, modification in the case where not departing from principle of the present utility model and objective, replaced
And modification, scope of the present utility model limits by claim and its equivalent.
Claims (10)
1. the denitration automatic control system of a kind of heat accumulating gas boiler, it is characterised in that heat accumulating gas boiler is provided with more
It is described many that correspondence is additionally provided with the burner of individual alternate combustion, one heat storage of each burner correspondence, the heat accumulating gas boiler
Multiple denitration nozzles that individual burner is set；
The denitration automatic control system includes：Solution transport subsystem, compressed air transport subsystem and control subsystem, its
In,
The solution transport subsystem includes：Agitation Tank, NaOH solution tank NaOH, solution pressure storage tank, multiple solution electromagnetic valves, solution conveying
Pump and solution pressure pump, the Agitation Tank are used to contain denitrfying agent, and the solution transfer pump is used for denitration in the Agitation Tank
Agent is delivered to the NaOH solution tank NaOH, and the solution pressure pump is used to denitrfying agent in the NaOH solution tank NaOH being delivered to the solution pressure storage
Tank, the solution pressure storage tank is connected with the multiple solution electromagnetic valve, the multiple solution electromagnetic valve respectively with it is the multiple
Denitration nozzle is connected；
The compressed air transport subsystem includes：Compressed air reservoir and multiple compressed air electromagnetic valves, the compressed air
Storage tank is connected with the multiple denitration nozzle respectively by the multiple compressed air electromagnetic valve, at each denitration nozzle
The compressed air electromagnetic valve and the solution electromagnetic valve synchro switch, the compressed air electromagnetic valve and the corresponding solution
Compressed air is sprayed to the burner hearth of the heat accumulating gas boiler after denitrfying agent is atomized when magnetic valve is opened；
The control subsystem includes：Flue gas analyzer, temperature detection part, pressure detecting part, frequency converter and PLC system, it is described
Flue gas analyzer is used to analyze the nitrogen oxides in effluent content discharged out of multiple the heat storages, and the temperature detection part is used
In detecting in multiple heat storages and temperature in the burner hearth, the pressure detecting part is used to detect the pressure in the burner hearth,
The flue gas analyzer, the temperature detection part and the pressure detecting part are connected with the PLC system respectively, the frequency converter
It is connected to adjust the rotating speed of the solution pressure pump, the PLC system and the frequency conversion by frequency conversion with the solution pressure pump
Device is connected, and the PLC system to the temperature value of reception, pressure value and amount of nitrogen oxides value after data analysis is carried out, control
The frequency of the frequency converter.
2. the denitration automatic control system of heat accumulating gas boiler according to claim 1, it is characterised in that the control
Subsystem also includes：Relay, the relay is connected with the solution transfer pump to control the switch of the solution transfer pump,
The PLC system is connected to control the operation of the relay with the relay；
Flow transmitter, the flow transmitter is located between the solution pressure storage tank and the multiple solution electromagnetic valve, institute
Flow transmitter is stated to electrically connect with the PLC system.
3. the denitration automatic control system of heat accumulating gas boiler according to claim 1, it is characterised in that the solution
Transport subsystem also includes：Overflow valve, the import of the overflow valve is connected in series in the solution pressure pump and the solution pressure
Between power storage tank, the outlet of the overflow valve is connected with the NaOH solution tank NaOH.
4. the denitration automatic control system of heat accumulating gas boiler according to claim 3, it is characterised in that the solution
First pressure sensor, the first pressure sensor and the PLC systems are provided between the import of compression pump and the overflow valve
System electrical connection.
5. the denitration automatic control system of heat accumulating gas boiler according to claim 1, it is characterised in that the solution
Pressure vessel is provided with second pressure sensor, and the second pressure sensor is electrically connected with the PLC system.
6. the denitration automatic control system of heat accumulating gas boiler according to claim 2, it is characterised in that the solution
Tank is provided with solution level bound detection piece, and the solution level bound detection piece is electrically connected with PLC system, the PLC
System is delivered to the denitration agent flux in the NaOH solution tank NaOH by the Control.
7. the denitration automatic control system of heat accumulating gas boiler according to claim 1, it is characterised in that described to match somebody with somebody liquid
Tank, which is provided with, matches somebody with somebody liquid liquid level lower limit detection piece, and the denitration automatic control system also includes alarm, described to match somebody with somebody liquid liquid level lower limit
Detection piece is electrically connected with the alarm.
8. the denitration automatic control system of heat accumulating gas boiler according to claim 1, it is characterised in that the compression
The 3rd pressure sensor, the 3rd pressure sensor and institute are provided between air reservoir and the multiple compressed air electromagnetic valve
State PLC system electrical connection.
9. the denitration automatic control system of heat accumulating gas boiler according to claim 8, it is characterised in that the compression
Stop valve is provided between air reservoir and the 3rd pressure sensor.
10. the denitration automatic control system of the heat accumulating gas boiler according to any one of claim 1-9, its feature exists
In the pressure detecting part is the 4th pressure sensor, and the temperature detection part includes each accumulation of heat body temperature of detection
The first thermocouple and detect the second thermocouple of temperature in the burner hearth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377394.3U CN206322002U (en) | 2016-12-14 | 2016-12-14 | The denitration automatic control system of heat accumulating gas boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377394.3U CN206322002U (en) | 2016-12-14 | 2016-12-14 | The denitration automatic control system of heat accumulating gas boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206322002U true CN206322002U (en) | 2017-07-11 |
Family
ID=59267707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621377394.3U Expired - Fee Related CN206322002U (en) | 2016-12-14 | 2016-12-14 | The denitration automatic control system of heat accumulating gas boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206322002U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108786401A (en) * | 2018-06-07 | 2018-11-13 | 光大环保技术研究院（南京）有限公司 | A kind of PNCR denitrfying agents spray gun control system and PNCR denitrfying agent spray gun control methods |
| TWI705316B (en) * | 2018-04-27 | 2020-09-21 | 日商三菱日立電力系統股份有限公司 | Boiler operation support device, boiler operation support method, and boiler learning model creation method |
-
2016
- 2016-12-14 CN CN201621377394.3U patent/CN206322002U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI705316B (en) * | 2018-04-27 | 2020-09-21 | 日商三菱日立電力系統股份有限公司 | Boiler operation support device, boiler operation support method, and boiler learning model creation method |
| CN108786401A (en) * | 2018-06-07 | 2018-11-13 | 光大环保技术研究院（南京）有限公司 | A kind of PNCR denitrfying agents spray gun control system and PNCR denitrfying agent spray gun control methods |
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Address after: 102200 Beijing city Changping District Machi Town cow Road No. 18 Patentee after: Shenwu Technology Group Co.,Ltd. Address before: 102200 Beijing city Changping District Machi Town cow Road No. 18 Patentee before: BEIJING SHENWU ENVIRONMENT AND ENERGY TECHNOLOGY Co.,Ltd. |
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