CN103961990A - Flue gas repeated aeration desulfurization and denitrification system and control method thereof - Google Patents
Flue gas repeated aeration desulfurization and denitrification system and control method thereof Download PDFInfo
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- CN103961990A CN103961990A CN201410175336.1A CN201410175336A CN103961990A CN 103961990 A CN103961990 A CN 103961990A CN 201410175336 A CN201410175336 A CN 201410175336A CN 103961990 A CN103961990 A CN 103961990A
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Abstract
The invention discloses a flue gas repeated aeration desulfurization and denitrification system which comprises a tower body, a basic solution tank, a recycling tank, a smoke passage, a chimney, a monitoring device, an executive device, a computing control device and two aeration rooms, wherein each aeration room comprises an aeration tank and a spraying rack. The invention further discloses a fuzzy control method for the flue gas repeated aeration desulfurization and denitrification system. The fuzzy control method comprises the following steps: step 1, generating a fuzzy control model rule list; step 2, adjusting and controlling the liquid level height of alkali wastewater in the aeration tanks; step 3: adjusting and controlling the water flow of spraying passages. Through the utilization of the alkali wastewater to perform flue gas desulfurization and denitrification treatment, the cost of the flue gas desulfurization and denitrification in the prior art is reduced.
Description
Technical field
The present invention relates to treatment technology and the automation field of fire coal boiler fume, in particular repeatedly aeration system for desulfuration and denitration and fuzzy control method of a kind of flue gas.
Background technology
The main comburant of Mei Shi China thermal power generation, the oxysulfide producing in coal burning process, nitrogen oxide have caused day by day serious harm to China's atmospheric environment.Conventionally the fume desulphurization method adopting is lime/lime stone-gypsum wet, and the method efficiency is higher.But China is domestic, the research of this technology is not yet had to breakthrough, this system is mainly main from Japanese import at present, the medium small boiler business burden of China 70% not at present a large amount of capital expenditures of conventional sulfur removal technology and high operating cost.In addition, form the low-grade gypsum contain a large amount of impurity after the desulfurization of lime/lime stone-gypsum wet, the processing of being abandoned of most of desulfurization product, has caused secondary pollution to environment.Meanwhile, the a large amount of alkaline waste waters of the annual discharge of the enterprises such as China's printing and dyeing, papermaking, process hides, chemical industry, for example, the discharge capacity total amount of textile printing and dyeing wastewater in 2007 is up to 22.5 hundred million tons, the alkaline waste water of middle-size and small-size papermaking enterprise discharge approximately has more than 10 hundred million tons, and alkaline waste water need to be processed up to standard just can discharge afterwards.Physico-chemical process for the treatment of alkaline sewage mainly contains acid-base neutralization method, flocculence, chemical precipitation method and crystallisation at present.It is fruitful that traditional physics, chemical method are processed alkaline sewage.But because the discharge capacity of alkaline sewage is too large, by conventional process, want many retort and storage tank, expend a large amount of reagent, equipment investment and producing cost are all very large.The high processing cost of facing flue gas and alkaline waste liquor is a large technical barrier of present enterprise, and therefore, prior art has yet to be improved and developed, and seeks flue gas and alkaline waste liquor low-cost processes technology
Summary of the invention
One of object of the present invention is to provide repeatedly aeration system for desulfuration and denitration of a kind of flue gas, be the chemical reaction that utilizes alkaline waste water and flue gas, remove nitrogen oxide and the sulfur oxide pollutant of high valence state in flue gas, and alkaline waste water pH value is lowered, be intended to solve the problem that existing flue gas desulfurization and denitrification and alkaline waste water processing cost are high.
For realizing above object, the technical scheme that the present invention has taked is:
Flue gas is an aeration system for desulfuration and denitration repeatedly, and it comprises:
Tower body, the short transverse along this tower body in described tower body is provided with lower aeration space and upper aeration space from the bottom to top successively; The bottom of described lower aeration space and upper aeration space is respectively equipped with for the first aeration tank of splendid attire denitration alkaline waste water to be desulfurization and the second aeration tank, described the first aeration tank is provided with the first water inlet, the first delivery port, in the bottom of this first aeration tank and be provided with the first flue collector, described the second aeration tank is provided with the second water inlet, the second delivery port, in the bottom of this second aeration tank and be provided with the second flue collector; The upside of described the first aeration tank and the second aeration tank is separately installed with one for spraying the first spraying rack and second spraying rack of alkaline waste water in the aeration tank to corresponding; Described the first spraying rack is connected with one first spray channels, and described the first water inlet is connected with one first intake tunnel, and described the second spraying rack is connected with one second spray channels, and described the second water inlet is connected with one second intake tunnel;
Former liquid pool, described former liquid pool is connected with the second intake tunnel and the second spray channels respectively by transfer passage, for being respectively the second aeration tank and the second spraying rack provides alkaline waste water;
Recovery pond, described recovery pond is connected with the first delivery port by one first exhalant canal;
Described the second delivery port is connected with the first intake tunnel and the first spray channels respectively by the second exhalant canal, for being respectively the first aeration tank and the first spraying rack provides alkaline waste water;
Described the first flue collector is connected for input the first fume inlet passage of flue gas to this first flue collector with one, the top of described lower aeration space is provided with outlet flue, described the second flue collector is connected with one second fume inlet passage, described outlet flue is connected with the second fume inlet passage by a smoke-outlet flue, for inputting flue gas to the second flue collector;
Chimney, described chimney is connected with the top of tower body, for discharging the waste gas after end reaction;
Monitoring device, described monitoring device comprises aeration tank liquid monitoring device and flow monitoring device;
Wherein, described aeration tank liquid monitoring device comprises: for monitoring respectively first liquid level of aeration tank neutral and alkali waste water and the first ultrasonic level gage of temperature and the first infrared temperature sensor, for monitoring respectively second liquid level of aeration tank neutral and alkali waste water and the second ultrasonic level gage of temperature and the second infrared temperature sensor and being respectively used to the first aeration tank and the first pH value sensor of the pH value of the second aeration tank neutral and alkali waste water and the second pH value sensor; Described the first ultrasonic level gage and the first infrared temperature sensor are all installed on the tower body inwall between the first spraying rack and the first aeration tank, the second ultrasonic level gage and the second infrared temperature sensor are installed on the tower body inwall between the second spraying rack and the second aeration tank, and described the first pH value sensor and the second pH value sensor are installed on respectively in the first aeration tank and the second aeration tank;
Described flow monitoring device comprises the first liquid flowmeter that is installed on the second spray channels, be installed on second liquid flowmeter on the second intake tunnel, be installed on the 3rd fluid flowmeter on the first spray channels, be installed on the first gas flowmeter on smoke-outlet flue, be installed on the 4th fluid flowmeter on the first exhalant canal and be installed on the second gas flowmeter on the first fume inlet passage;
Actuating unit, described actuating unit comprises: be installed on respectively the first driven opening bottom valve, the second driven opening bottom valve, the 3rd driven opening bottom valve, the 4th driven opening bottom valve and the 5th driven opening bottom valve on the second spray channels, the second intake tunnel, the first spray channels, the first intake tunnel and the first exhalant canal; Described actuating unit further comprises the variable frequency pump being installed on transfer passage;
Operation control device, described operation control device, for according to the monitored data of monitoring device, carries out fuzzy control to actuating unit.
A plurality of first minute flue being connected with the first flue collector are installed in described the first flue collector, and within described first minute, flue is provided with a plurality of the first intercommunicating pores that are connected with the first aeration tank; A plurality of second minute flue being connected with the second flue collector are installed in described the second flue collector, and within described second minute, flue is provided with a plurality of the second intercommunicating pores that are connected with the second aeration tank.
In described the second fume inlet passage, a check valve is installed, to prevent that gas backstreaming in the second flue collector is to lower aeration space.
Described operation control device is PLC.
Another object of the present invention is to provide the flue gas method that repeatedly aeration system for desulfuration and denitration carries out fuzzy control that adopts, be the chemical reaction that utilizes alkaline waste water and flue gas, remove nitrogen oxide and the sulfur oxide pollutant of high valence state in flue gas, and alkaline waste water pH value is lowered, be intended to solve the problem that existing flue gas desulfurization and denitrification and alkaline waste water processing cost are high.
For realizing above object, the technical scheme that the present invention has taked is:
Adopt the above-mentioned flue gas method that repeatedly aeration system for desulfuration and denitration carries out fuzzy control, it comprises the following steps:
Step 1, generation fuzzy control model rule list, described fuzzy control model rule list comprises liquid level specified rate defuzzification and spray rate specified rate defuzzification;
Step 2, according to the liquid height specified rate of liquid level specified rate defuzzification, combine with the monitored data of the first ultrasonic level gage, by fuzzy reasoning, obtaining best PID regulates after control parameter, export one first control signal, this first control signal is for regulating the liquid level of controlling the first aeration tank neutral and alkali waste water; According to the liquid height specified rate of liquid level specified rate defuzzification, combine with the monitored data of the second ultrasonic level gage, by fuzzy reasoning, obtaining best PID regulates after control parameter, export one second control signal, this second control signal is for regulating the liquid level of controlling the second aeration tank neutral and alkali waste water;
Step 3, according to the spray rate specified rate of spray rate specified rate defuzzification, combine with the monitored data of the 3rd fluid flowmeter, by fuzzy reasoning, obtaining best PID regulates after control parameter, export one the 3rd control signal, the 3rd control signal is for regulating the discharge of controlling the first spray channels; According to the spray rate specified rate of spray rate specified rate defuzzification, combine with the monitored data of first liquid flowmeter, by fuzzy reasoning, obtaining best PID regulates after control parameter, export one the 4th control signal, the 4th control signal is for regulating the discharge of controlling the second spray channels.
The control method of the liquid level of the first aeration tank neutral and alkali waste water is to comprise following one or more:
The first control signal is by regulating the aperture of the 4th driven opening bottom valve, thus the flow rate of liquid of adjustment the first intake tunnel;
The first control signal is by regulating the aperture of the 5th driven opening bottom valve, thus the flow rate of liquid of adjustment the first exhalant canal.
In described step 2, the control method of the liquid level of the second aeration tank neutral and alkali waste water is to comprise following one or more:
The second control signal is by regulating the aperture of the second driven opening bottom valve, thus the flow rate of liquid of adjustment the second intake tunnel;
The second control signal by regulating the 3rd driven opening bottom valve or/and the aperture of the 4th driven opening bottom valve, thereby adjust the flow rate of liquid of the second exhalant canal;
The second control signal is by regulating the rotating speed of the frequency of supply change variable frequency pump of variable frequency pump, thus the flow rate of liquid of adjustment the second intake tunnel.
In described step 3, the 3rd control signal is by regulating the aperture of the 3rd driven opening bottom valve, thus the flow rate of liquid of adjustment the first spray channels.
In described step 3, the 4th control signal, by regulating the frequency of supply of variable frequency pump to change the rotating speed of variable frequency pump, or/and the 4th control signal passes through to regulate the aperture of the first driven opening bottom valve, thereby is adjusted the flow rate of liquid of the second spray channels.
Described fuzzy control model rule list is the first pH value sensor, the second pH value sensor, the first gas flowmeter, the second gas flowmeter and the second infrared temperature sensor obtaining according to the many experiments of liquid level and spray rate, the best monitor database of the first infrared temperature sensor.
The invention has the beneficial effects as follows:
1, alkaline waste water repeatedly aeration desulphurization denitration equipment adopt sandwich construction, the alkaline waste water of different PH is distributed in each structure sheaf, flue gas is carried out repeatedly to aeration and processes with spray;
The sampled data of the alkaline waste liquor temperature that 2, experiment obtains, alkaline waste liquor pH value, alkaline waste liquor liquid level, alkaline waste liquor spray rate, flue gas flow rate, discharge exhaust gas components is carried out segmentation, realize discretization, the obfuscation of input and output amount, find out the mapping relations between input and output, by online data analysis, set up model and the rule list of fuzzy control;
3, monitor in real time repeatedly aeration desulphurization denitration equipment operational factor of alkaline waste water, by according to aforesaid Mathematical Modeling, inquiry fuzzy control rule table, by controlling every layer of alkaline waste liquor liquid level and spray rate, guarantees that alkaline waste water is to flue gas desulfurization and denitrification treatment effect.
The invention has the beneficial effects as follows: utilize alkaline waste water to process and to reduce the processing cost of flue gas desulfurization and denitrification and alkaline waste water neutralization in the past flue gas desulfurization and denitrification.
Accompanying drawing explanation
Fig. 1 is repeatedly aeration system for desulfuration and denitration structural representation of flue gas of the present invention.
Fig. 2 is the repeatedly fuzzy control method schematic diagram of aeration system for desulfuration and denitration of flue gas of the present invention.
Wherein: 1, tower body; 2, aeration tank; 21, spray channels; 22, intake tunnel; 23, fume inlet passage; 24, exhalant canal; 25, flue collector; 251, divide flue; 26, spraying rack; 27, smoke-outlet flue; 3, aeration tank; 31, spray channels; 32, intake tunnel; 33, fume inlet passage; 331, check valve; 34, exhalant canal; 35, flue collector; 351, divide flue; 36, spraying rack; 4, chimney; 5, former liquid pool; 51, transfer passage; 511, variable frequency pump; 6, recovery pond; 71, driven opening bottom valve; 72, driven opening bottom valve; 73, driven opening bottom valve; 74, driven opening bottom valve; 75, driven opening bottom valve; 81, fluid flowmeter; 82, fluid flowmeter; 83, fluid flowmeter; 84, gas flowmeter; 85, fluid flowmeter; 86, gas flowmeter; 91, infrared temperature sensor; 92, ultrasonic level gage; 93, pH value sensor; 94, infrared temperature sensor; 95, ultrasonic level gage; 96, pH value sensor.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, content of the present invention is described in further details.
Embodiment
For alkaline waste water is fully reacted with the sulfur and nitrogen oxides in flue gas, discharge flue gas reaches discharge standard.First by a large amount of experiments, obtain the relation between alkaline waste liquor temperature, alkaline waste liquor pH value, alkaline waste liquor liquid level, alkaline waste liquor spray rate, flue gas flow rate and discharge exhaust gas components; By online data analysis, set up the model of fuzzy control again; The variation of alkaline waste liquor temperature, alkaline waste liquor pH value, flue gas flow rate in the flue gas desulfurization and denitrification device of the monitoring alkaline waste water that final system is real-time, control alkaline waste liquor liquid level, alkaline waste liquor replacing, alkaline waste liquor spray rate, realize alkaline waste water and fully react with the sulfur and nitrogen oxides in flue gas.Flue gas repeatedly in aeration system for desulfuration and denitration the alkaline waste water pH value of each layer not identical, use repeatedly the mode of aeration and spray can effectively prevent flue gas and the too short reaction efficiency that causes of alkaline waste water reaction time low.
One, please refer to shown in Fig. 1, the flue gas desulfurization and denitrification system of whole alkaline waste water can be divided into four parts: the repeatedly desulfuring and denitrifying apparatus of aeration, checkout gear, operation control device, actuating unit.Wherein:
1, repeatedly the desulfuring and denitrifying apparatus of aeration comprises: tower body 1, chimney 4, former liquid pool 5, recovery pond 6.Wherein, the interior short transverse along this tower body 1 of tower body 1 is provided with lower aeration space and upper aeration space from the bottom to top successively; The bottom of lower aeration space and upper aeration space is respectively equipped with for the aeration tank 2 of splendid attire denitration alkaline waste water to be desulfurization and aeration tank 3, aeration tank 2 and aeration tank 3 are equipped with water inlet, delivery port, simultaneously, in the bottom of this aeration tank 2 and be provided with flue collector 25, in the bottom of this aeration tank 3 and be provided with flue collector 35; The upside of aeration tank 2 and aeration tank 3 is separately installed with one for spraying spraying rack 26 and the spraying rack 36 of alkaline waste water in the aeration tank to corresponding; Spraying rack 26 is connected with a spray channels 21, and the water inlet of aeration tank 2 is connected with an intake tunnel 22, and spraying rack 36 is connected with a spray channels 31, and the water inlet of aeration tank 3 is connected with an intake tunnel 32.Former liquid pool 5 is connected with intake tunnel 32 and spray channels 31 respectively by transfer passage 51, for being respectively aeration tank 3 and spraying rack 36 provides alkaline waste water.Recovery pond 6 is connected with the delivery port of aeration tank 2 by an exhalant canal 24.The delivery port of aeration tank 3 is connected with intake tunnel 22 and spray channels 21 respectively by exhalant canal 34, for being respectively aeration tank 2 and spraying rack 26 provides alkaline waste water.Flue collector 25 is connected for input the fume inlet passage 23 of flue gas to this flue collector 25 with one, the top of aeration space is provided with outlet flue, flue collector 35 is connected with a fume inlet passage 33, and outlet flue is connected with fume inlet passage 33 by a smoke-outlet flue 27, for inputting flue gas to flue collector 35.Chimney 4 is connected with the top of tower body 1, for discharging the waste gas after end reaction.A plurality of minute flues 251 that are connected with flue collector 25 are installed in flue collector 25, and a minute flue 251 is provided with a plurality of intercommunicating pores that are connected with aeration tank 2; A plurality of minute flues 351 that are connected with flue collector 35 are installed in flue collector 35, and a minute flue 351 is provided with a plurality of intercommunicating pores that are connected with aeration tank 3.
One check valve 331 is installed in fume inlet passage 33, to prevent that gas backstreaming in flue collector 35 is to aeration space.
2, monitoring device, monitoring device comprises aeration tank liquid monitoring device and flow monitoring device; Wherein, liquid monitoring device in aeration tank comprises: for monitoring respectively aeration tank 2 liquid levels of neutral and alkali waste water and the ultrasonic level gage of temperature 95 and infrared temperature sensor 94, for monitoring respectively aeration tank 3 liquid levels of neutral and alkali waste water and the ultrasonic level gage of temperature 92 and infrared temperature sensor 91 and being respectively used to aeration tank 2 and the pH value sensor 96 of the pH value of aeration tank 3 neutral and alkali waste water and pH value sensor 93; Ultrasonic level gage 95 and infrared temperature sensor 94 are all installed on tower body 1 inwall between spraying rack 26 and aeration tank 2, ultrasonic level gage 92 and infrared temperature sensor 91 are installed on tower body 1 inwall between spraying rack 36 and aeration tank 3, and pH value sensor 96 and pH value sensor 93 are installed on respectively in aeration tank 2 and aeration tank 3; Flow monitoring device comprises the fluid flowmeter 81 that is installed on spray channels 31, be installed on fluid flowmeter 82 on intake tunnel 32, be installed on fluid flowmeter 83 on spray channels 21, be installed on gas flowmeter 84 on smoke-outlet flue 27, be installed on the fluid flowmeter 85 on exhalant canal 24 and be installed on the gas flowmeter 86 on fume inlet passage;
3, actuating unit comprises: be installed on respectively driven opening bottom valve 71, driven opening bottom valve 72, driven opening bottom valve 73, driven opening bottom valve 74 and driven opening bottom valve 75 on spray channels 31, intake tunnel 32, spray channels 21, intake tunnel 22 and exhalant canal 24; Actuating unit also comprises the variable frequency pump 511 being installed on transfer passage 51.Actuating unit input adopts 4-20mA current signal.
4, operation control device, operation control device, for according to the monitored data of monitoring device, carries out fuzzy control to actuating unit.Operation control device adopts can adapt to various severe running environment, and antijamming capability is strong, the S7-300 Siemens PLC C that reliability is strong.At the built-in vertical fuzzy rule base of PLC, checkout gear is all used 4-20mA current signal that input quantity is passed in PLC, to detect input quantity obfuscation, according to the input quantity inquiry fuzzy rule base after obfuscation, by fuzzy rule base, draw fuzzy control quantity, to after fuzzy control quantity defuzzification, draw accurate controlled quentity controlled variable, through output module, executing agency is controlled, PLC output adopts the current signal of the 4-20mA identical with actuating unit.Please refer to shown in Fig. 2, a kind of above-mentioned flue gas method that repeatedly aeration system for desulfuration and denitration carries out fuzzy control that adopts, it comprises the following steps:
Step 1, generation fuzzy control model rule list, fuzzy control model rule list comprises liquid level specified rate defuzzification and spray rate specified rate defuzzification.Fuzzy control model rule list is pH value sensor 96, pH value sensor 93, gas flowmeter 84, gas flowmeter 86 and the infrared temperature sensor 91 obtaining according to the many experiments of liquid level and spray rate, the best monitor database of infrared temperature sensor 94.For different alkaline waste water pH values and flue gas input quantity, by repeatedly debugging liquid level and spray rate, reached the effect of energy-saving and emission-reduction.Fuzzy control model rule list, according to alkaline waste water pH value, flue gas input quantity and exhaust gas constituents content, is exported corresponding liquid level specified rate defuzzification and spray rate specified rate defuzzification.
Step 2, according to the liquid height specified rate of liquid level specified rate defuzzification, combine with the monitored data of ultrasonic level gage 95, by fuzzy reasoning, obtaining best PID regulates after control parameter, export one first control signal, this control signal is for regulating the liquid level of controlling aeration tank 2 neutral and alkali waste water; According to the liquid height specified rate of liquid level specified rate defuzzification, combine with the monitored data of ultrasonic level gage 92, by fuzzy reasoning, obtaining best PID regulates after control parameter, export one second control signal, this control signal is for regulating the liquid level of controlling aeration tank 3 neutral and alkali waste water.
The liquid level of aeration tank 2 neutral and alkali waste water is carried out to control method is: the first control signal is by regulating the aperture of driven opening bottom valve 74, thus the flow rate of liquid of adjustment intake tunnel 22; Or/and the first control signal passes through to regulate the aperture of driven opening bottom valve 75, thereby adjust the flow rate of liquid of aquaporin 24.
The liquid level of aeration tank 3 neutral and alkali waste water is carried out to control method is: the second control signal is by regulating the aperture of driven opening bottom valve 72, thus the flow rate of liquid of adjustment intake tunnel 32; Or/and the second control signal by regulating driven opening bottom valve 73 or/and the aperture of driven opening bottom valve 74, thereby adjust the flow rate of liquid of aquaporin 34; Or/and the second control signal changes the rotating speed of variable frequency pump 511 by the frequency of supply of adjusting variable frequency pump 511, thereby adjust the flow rate of liquid of intake tunnel 32.
Step 3, according to the spray rate specified rate of spray rate specified rate defuzzification, combine with the monitored data of fluid flowmeter 83, by fuzzy reasoning, obtaining best PID regulates after control parameter, export one the 3rd control signal, this control signal is for regulating the discharge of controlling spray channels 21; According to the spray rate specified rate of spray rate specified rate defuzzification, combine with the monitored data of fluid flowmeter 81, by fuzzy reasoning, obtaining best PID regulates after control parameter, export one the 4th control signal, this control signal is for regulating the discharge of controlling spray channels 31.Wherein, the 3rd control signal is by regulating the aperture of driven opening bottom valve 73, thus the flow rate of liquid of adjustment spray channels 21.The 4th control signal, by regulating the frequency of supply of variable frequency pump 511 to change the rotating speed of variable frequency pump 511, or/and control signal passes through to regulate the aperture of driven opening bottom valve 71, thereby is adjusted the flow rate of liquid of spray channels 31.
With one, having particular application as example is explained and illustrated above-mentioned fuzzy control method:
1. the interior PH of former liquid pool 5 is in 12 left and right, by variable frequency pump 511, feeds these alkaline waste waters repeatedly in aeration desulphurization denitration equipment, for spraying rack 36 and aeration tank 3 provide alkaline waste water.
2. what the Flow-rate adjustment of spraying rack 36 and aeration tank 3 adopted is that (initial control device is according to fuzzy rule base for close-loop control mode, draw the optimum working value of the spray rate of spraying rack 36 and the liquid level of aeration tank 3, by spray channels 31 and the driven opening bottom valve of intake tunnel 32 are controlled, can adjust spraying rack 36 spray rates and aeration tank 3 liquid levels, by fluid flowmeter 81, fluid flowmeter 82 carries out information feedback with ultrasonic level gage 92, motion control device compares the carrying out of spray rate and aeration tank liquid level is precisely controlled with initial value information feedback).
3. monitor in real time the pH value of aeration tank 3, when aeration tank 3 neutral and alkali waste liquid pH values be less than 10 or aeration tank 2 liquid levels lower than when setting value, on aeration tank 2, the driven opening bottom valve 74 of intake tunnel 22 is opened, alkaline waste liquor in aeration tank 3 flows into aeration tank 2, when aeration tank 3 neutral and alkali waste liquid pH values be greater than 10.5 and aeration tank 2 liquid levels higher than when setting value, on aeration tank 2, the driven opening bottom valve 74 of intake tunnel 22 is opened.
4. what the Flow-rate adjustment of spraying rack 26 and aeration tank 2 also adopted is that (initial control device is according to fuzzy rule base for close-loop control mode, draw the optimum working value of the spray rate of spraying rack 26 and the liquid level of aeration tank 2, by spray channels 21 and the driven opening bottom valve of intake tunnel 22 are controlled, can adjust spraying rack 26 spray rates and aeration tank 2 liquid levels, by fluid flowmeter 83 and ultrasonic level gage 95, carry out information feedback, motion control device compares the carrying out of spray rate and aeration tank liquid level is precisely controlled with initial value information feedback).
5. monitor in real time the pH value of aeration tank 2, when aeration tank 2 neutral and alkali waste liquid pH values are less than 9 or the liquid level of aeration tank 2 higher than when setting value, on aeration tank 2, the driven opening bottom valve 74 of intake tunnel 22 is opened, aeration tank 2 is entered in recovery pond 6, when aeration tank 2 neutral and alkali waste liquid pH values are greater than 9.5 and aeration tank 2 lower than when setting value, on aeration tank 2, the driven opening bottom valve 74 of intake tunnel 22 cuts out.
Although the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.In addition, for particular condition or application, can make various modifications to the present invention, and not depart from the scope of the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall within the scope of the claims in the present invention.
Claims (10)
1. a flue gas aeration system for desulfuration and denitration repeatedly, is characterized in that, it comprises:
Tower body (1), the short transverse along this tower body (1) in described tower body (1) is provided with lower aeration space and upper aeration space from the bottom to top successively; The bottom of described lower aeration space and upper aeration space is respectively equipped with for first aeration tank (2) of splendid attire denitration alkaline waste water to be desulfurization and the second aeration tank (3), described the first aeration tank (2) is provided with the first water inlet, the first delivery port, in the bottom of this first aeration tank (2) and be provided with the first flue collector (25), described the second aeration tank (3) is provided with the second water inlet, the second delivery port, in the bottom of this second aeration tank (3) and be provided with the second flue collector (35); The upside of described the first aeration tank (2) and the second aeration tank (3) is separately installed with one for spraying the first spraying rack (26) and second spraying rack (36) of alkaline waste water in the aeration tank to corresponding; Described the first spraying rack (26) is connected with one first spray channels (21), described the first water inlet is connected with one first intake tunnel (22), described the second spraying rack (36) is connected with one second spray channels (31), and described the second water inlet is connected with one second intake tunnel (32);
Former liquid pool (5), described former liquid pool (5) is connected with the second intake tunnel (32) and the second spray channels (31) respectively by transfer passage (51), for being respectively the second aeration tank (3) and the second spraying rack (36) provides alkaline waste water;
Recovery pond (6), described recovery pond (6) is connected with the first delivery port by one first exhalant canal (24);
Described the second delivery port is connected with the first intake tunnel (22) and the first spray channels (21) respectively by the second exhalant canal (34), for being respectively the first aeration tank (2) and the first spraying rack (26) provides alkaline waste water;
Described the first flue collector (25) is connected for the first fume inlet passage (23) to this first flue collector (25) input flue gas with one, the top of described lower aeration space is provided with outlet flue, described the second flue collector (35) is connected with one second fume inlet passage (33), described outlet flue is connected with the second fume inlet passage (33) by a smoke-outlet flue (27), for inputting flue gas to the second flue collector (35);
Chimney (4), described chimney (4) is connected with the top of tower body (1), for discharging the waste gas after end reaction;
Monitoring device, described monitoring device comprises aeration tank liquid monitoring device and flow monitoring device;
Wherein, described aeration tank liquid monitoring device comprises: for monitoring respectively the liquid level of the first aeration tank (2) neutral and alkali waste water and first ultrasonic level gage (95) of temperature and the first infrared temperature sensor (94), for monitoring respectively the liquid level of the second aeration tank (3) neutral and alkali waste water and second ultrasonic level gage (92) of temperature and the second infrared temperature sensor (91) and being respectively used to the first aeration tank (2) and the first pH value sensor (96) of the pH value of the second aeration tank (3) neutral and alkali waste water and the second pH value sensor (93); Described the first ultrasonic level gage (95) and the first infrared temperature sensor (94) are all installed on tower body (1) inwall between the first spraying rack (26) and the first aeration tank (2), the second ultrasonic level gage (92) and the second infrared temperature sensor (91) are installed on tower body (1) inwall between the second spraying rack (36) and the second aeration tank (3), and described the first pH value sensor (96) and the second pH value sensor (93) are installed on respectively in the first aeration tank (2) and the second aeration tank (3);
Described flow monitoring device comprises the first liquid flowmeter (81) that is installed on the second spray channels (31), be installed on second liquid flowmeter (82) on the second intake tunnel (32), be installed on the 3rd fluid flowmeter (83) on the first spray channels (21), be installed on the first gas flowmeter (84) on smoke-outlet flue (27), be installed on the 4th fluid flowmeter (85) on the first exhalant canal (24) and be installed on the second gas flowmeter (86) on the first fume inlet passage;
Actuating unit, described actuating unit comprises: be installed on respectively the first driven opening bottom valve (71), the second driven opening bottom valve (72), the 3rd driven opening bottom valve (73), the 4th driven opening bottom valve (74) and the 5th driven opening bottom valve (75) on the second spray channels (31), the second intake tunnel (32), the first spray channels (21), the first intake tunnel (22) and the first exhalant canal (24); Described actuating unit further comprises the variable frequency pump (511) being installed on transfer passage (51);
Operation control device, described operation control device, for according to the monitored data of monitoring device, carries out fuzzy control to actuating unit.
2. flue gas according to claim 1 aeration system for desulfuration and denitration repeatedly, it is characterized in that, a plurality of first minute flue (251) being connected with the first flue collector (25) are installed in described the first flue collector (25), described first minute flue (251) be provided with a plurality of the first intercommunicating pores that are connected with the first aeration tank (2); A plurality of second minute flue (351) being connected with the second flue collector (35) are installed in described the second flue collector (35), described second minute flue (351) be provided with a plurality of the second intercommunicating pores that are connected with the second aeration tank (3).
3. flue gas according to claim 1 aeration system for desulfuration and denitration repeatedly, it is characterized in that, one check valve (331) is installed in described the second fume inlet passage (33), to prevent that gas backstreaming in the second flue collector (35) is to lower aeration space.
4. flue gas according to claim 1 aeration system for desulfuration and denitration repeatedly, is characterized in that, described operation control device is PLC.
5. according to the flue gas method that repeatedly aeration system for desulfuration and denitration carries out fuzzy control described in claim 1-4 any one, it is characterized in that, it comprises the following steps:
Step 1, generation fuzzy control model rule list, described fuzzy control model rule list comprises liquid level specified rate defuzzification and spray rate specified rate defuzzification;
Step 2, according to the liquid height specified rate of liquid level specified rate defuzzification, combine with the monitored data of the first ultrasonic level gage (95), by fuzzy reasoning, obtaining best PID regulates after control parameter, export one first control signal, this first control signal is used for regulating the liquid level of controlling the first aeration tank (2) neutral and alkali waste water; According to the liquid height specified rate of liquid level specified rate defuzzification, combine with the monitored data of the second ultrasonic level gage (92), by fuzzy reasoning, obtaining best PID regulates after control parameter, export one second control signal, this second control signal is used for regulating the liquid level of controlling the second aeration tank (3) neutral and alkali waste water;
Step 3, according to the spray rate specified rate of spray rate specified rate defuzzification, combine with the monitored data of the 3rd fluid flowmeter (83), by fuzzy reasoning, obtaining best PID regulates after control parameter, export one the 3rd control signal, the 3rd control signal is used for regulating the discharge of controlling the first spray channels (21); According to the spray rate specified rate of spray rate specified rate defuzzification, combine with the monitored data of first liquid flowmeter (81), by fuzzy reasoning, obtaining best PID regulates after control parameter, export one the 4th control signal, the 4th control signal is used for regulating the discharge of controlling the second spray channels (31).
6. method according to claim 5, is characterized in that, in described step 2, the control method of the liquid level of the first aeration tank (2) neutral and alkali waste water is to comprise following one or more:
The first control signal is by regulating the aperture of the 4th driven opening bottom valve (74), thus the flow rate of liquid of adjustment the first intake tunnel (22);
The first control signal is by regulating the aperture of the 5th driven opening bottom valve (75), thus the flow rate of liquid of adjustment the first exhalant canal (24).
7. method according to claim 5, is characterized in that, in described step 2, the control method of the liquid level of the second aeration tank (3) neutral and alkali waste water is to comprise following one or more:
The second control signal is by regulating the aperture of the second driven opening bottom valve (72), thus the flow rate of liquid of adjustment the second intake tunnel (32);
The second control signal by regulating the 3rd driven opening bottom valve (73) or/and the aperture of the 4th driven opening bottom valve (74), thereby adjust the flow rate of liquid of the second exhalant canal (34);
The second control signal is by regulating the rotating speed of the frequency of supply change variable frequency pump (511) of variable frequency pump (511), thus the flow rate of liquid of adjustment the second intake tunnel (32).
8. method according to claim 5, is characterized in that, in described step 3, the 3rd control signal is by regulating the aperture of the 3rd driven opening bottom valve (73), thus the flow rate of liquid of adjustment the first spray channels (21).
9. method according to claim 5, it is characterized in that, in described step 3, the 4th control signal is by regulating the frequency of supply of variable frequency pump (511) to change the rotating speed of variable frequency pump (511), or/and the 4th control signal passes through to regulate the aperture of the first driven opening bottom valve (71), thereby adjust the flow rate of liquid of the second spray channels (31).
10. method according to claim 5, it is characterized in that, described fuzzy control model rule list is the first pH value sensor (96), the second pH value sensor (93), the first gas flowmeter (84), the second gas flowmeter (86) and the second infrared temperature sensor (91) obtaining according to the many experiments of liquid level and spray rate, the best monitor database of the first infrared temperature sensor (94).
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