CN204746081U - Can realize flue gas desulfurization automatic controls of ultra -clean emission - Google Patents
Can realize flue gas desulfurization automatic controls of ultra -clean emission Download PDFInfo
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- CN204746081U CN204746081U CN201520385915.9U CN201520385915U CN204746081U CN 204746081 U CN204746081 U CN 204746081U CN 201520385915 U CN201520385915 U CN 201520385915U CN 204746081 U CN204746081 U CN 204746081U
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Abstract
The utility model discloses a can realize flue gas desulfurization automatic controls of ultra -clean emission relates to a flue gas desulfurization controlling means. It includes desulfurization absorption tower, main control unit, a plurality of thick liquid delivery pump, a plurality of oxidation fan and a plurality of slurry circulating pump, installs original flue gas analysis appearance, clean flue gas analysis appearance and thick liquid analysis appearance on the desulfurization absorption tower, original flue gas analysis appearance, clean flue gas analysis appearance, thick liquid analysis appearance, thick liquid delivery pump, oxidation fan, slurry circulating pump all are connected with the main control unit electricity, main control unit is the PID controller, all install variable frequency device on a plurality of thick liquid delivery pumps, a plurality of oxidation fan and a plurality of slurry circulating pump, variable frequency device is connected with the main control unit electricity. When inciting somebody to action the utility model discloses install back on desulfurization automatic control system, desulfurization automatic control system not only can be applicable to the transformation project, and is with low costs, and what the pH value in the absorbent can be stable moreover maintains 5.3-5.75, and desulfurization efficiency can reach 99%.
Description
Technical field
The utility model relates to a kind of flue gas desulfurization control device, specifically a kind of flue gas desulfurization automatic controls that can realize ultra-clean discharge.
Background technology
In Air Pollution Control field, people extensively adopt wet desulfurizing process to remove environmentally harmful composition in flue gas and (are mainly SO
2).Wet desulfurizing process completes in desulfuration absorbing tower (wet sprinkling absorption tower), desulfuration absorbing tower is built with the absorbent (lime stone, lime etc.) for absorbing harmful substances in flue gas, absorbent is in the process absorbing harmful substances in flue gas, harmful components generation chemical reaction in absorbent and flue gas, generates calcium sulfite, calcium sulfate etc.
At present, the up-to-date standard limit of smog release of national regulation is for being not more than 50mg/Nm
3, and existing wet process of FGD enterprise can only realize 35 ~ 50mg/Nm
3discharge, namely also existing wet process of FGD enterprise has just just reached current discharging standards.But along with the environmental protection consciousness of people is more and more stronger, the fume emission index of national regulation also will improve constantly, therefore need to develop a kind of novel flue gas desulfurization control system, the discharge standard that country is current can not only be met, and the current discharge standard of country can also be exceeded on a large scale; Meanwhile, if this novel flue gas desulfurization control system can also meet newly-built and requirement that is transformation project simultaneously, so novel flue gas desulfurization control system will be easy to be promoted.
Also there is the place had much room for improvement as follows in existing flue gas desulfurization control system: 1, the supply coverage bias of slurries (absorbent) and oxidized input air is larger; 2, the desulfuration efficiency of desulfuration absorbing tower is unstable, and the SO in desulfuration absorbing tower exit
2concentration is always at 35 ~ 50mg/Nm
3scope fluctuation.
Find through research, the basic reason of above-mentioned phenomenon is caused to be that the reaction of desulfuration absorbing tower inner absorbent and flue gas is insufficient, simultaneously, people also find when fluctuation appears in the desulfuration efficiency of desulfuration absorbing tower, the pH value of the slurries (absorbent) in desulfuration absorbing tower also there will be fluctuation, desulfuration efficiency fluctuation is larger, and the pH value change of slurries (absorbent) also can be greatly.The pH value of the slurries (absorbent) in desulfuration absorbing tower is the concentrated expression of sulfate radical in slurries, inferior sulfate radical, carbonate equal size, and the change of pH value will affect the consumption of desulfuration efficiency, gypsum qualitt, lime stone.
Further research shows, when the pH value of slurries is 5.3 ~ 5.75, and CaCO in absorbent
3content lower, the harmful components in absorbent and flue gas react the most abundant, and the chemical reaction in desulfuration absorbing tower (1) arrives balance substantially, and now gypsum qualitt is best, and desulfuration efficiency is the highest.
At present, there are two kinds of desulfurization automatic control systems on the market, respectively the structure of above-mentioned two kinds of Desulfurization Control Systems be described now:
As shown in Figure 2, the first desulfurization automatic control system (the first desulfurization automatic control system) comprises desulfuration absorbing tower 1, master controller, multiple slurries feed pump 3, multiple oxidation fan 4 and multiple slurry circulating pump 5, described desulfuration absorbing tower 1 is provided with former flue gas analyzer 6, neat stress analyzer 7 and slurries analyzer 8, described multiple slurry circulating pump 5 is all connected with desulfuration absorbing tower 1 top one end, the other end is connected with desulfuration absorbing tower 1 bottom, the air outlet of described multiple oxidation fan 4 is all connected with desulfuration absorbing tower 1 bottom, the discharging opening of described multiple slurries feed pump 3 is all connected with desulfuration absorbing tower 1 top, described former flue gas analyzer 6, neat stress analyzer 7, slurries analyzer 8, slurries feed pump 3, oxidation fan 4, slurry circulating pump 5 is all electrically connected with master controller.
In the first desulfurization automatic control system, the master controller of desulfurization automatic control system is DCS controller 22, slurries feed pump 3, oxidation fan 4 and slurry circulating pump 5 all adopt the pattern of power frequency start and stop (opening or close one of them pump housing or motor) to control, and slurries feed pump 3, oxidation fan 4 and slurry circulating pump 5 are not all installed the converter plant 9 that can realize 0-50Hz converting operation.
Under the control model of the first desulfurization automatic control system, the supply coverage bias of slurries (absorbent) and oxidized input air is larger, the continuous adjustment of raw material (water resource, lime, lime stone etc.) can not be realized, easily produce and regulate advanced or control lag; Meanwhile, the fluctuation range of the pH value of desulfuration absorbing tower 1 inner absorbent is also comparatively large, the SO in desulfuration absorbing tower 1 exit
2concentration is at 40 ~ 50mg/Nm
3scope fluctuates; Finally, the first desulfurization automatic control system is impacted comparatively large in shutdown process to motor and electrical network, and wastes a large amount of electric energy, can not accomplish energy-saving run.
The second desulfurization automatic control system is called the structure disclosed in " in a kind of wet desulfurizing process the energy-saving control system of serum recycle circulating pump and method (publication number is CN103321885A) " for utility model name, the slurry circulating pump 5 of above-mentioned the second desulfurization automatic control system is provided with converter plant 9, and adopts automaton to control the duty of slurry circulating pump 5.
In the second desulfurization automatic control system, the master controller of desulfurization automatic control system is still DCS controller, slurries feed pump 3 and wind transmission machine still adopt the pattern of power frequency start and stop to control, and slurries feed pump 3 and oxidation fan 4 all do not install the converter plant 9 that can realize 0-50Hz converting operation.
Under the control model of the second desulfurization automatic control system, because slurries feed pump 3 and wind transmission machine can not realize the automatic adjustment of rotating speed, therefore still there is absorbent and the insufficient problem of smoke reaction in the second desulfurization automatic control system, the supply coverage bias of slurries (absorbent) and oxidized input air is still larger, or the continuous adjustment of raw material (water resource, lime, lime stone etc.) can not be realized, or there is the problem regulating advanced or control lag; Meanwhile, due to the second desulfuration absorbing tower 1 or the pH value of desulfuration absorbing tower 1 inner absorbent can not be made to be stabilized between 5.3 ~ 5.75, therefore there is the large problem of fluctuation range in the desulfuration efficiency of the second desulfurization automatic control system; Finally, due to slurries feed pump 3 and oxidation fan 4 with all do not install converter plant 9, slurries feed pump 3 and oxidation fan 4 still can not regulate self rotating speed according to load variations automatically, therefore the second desulfurization automatic control system still exists waste electric energy, can not accomplish the problem of energy-saving run.
Utility model content
The purpose of this utility model is the weak point in order to overcome background technology, and provides a kind of flue gas desulfurization automatic controls that can realize ultra-clean discharge.
To achieve these goals, the technical solution of the utility model is: the flue gas desulfurization automatic controls that can realize ultra-clean discharge, is characterized in that: comprise PID controller, multiple for the slurries feed pump to desulfuration absorbing tower conveying absorbent, multiple for the oxidation fan to desulfuration absorbing tower conveying air, multiple slurry circulating pump for the slurries of desulfuration absorbing tower bottom being transported to desulfuration absorbing tower top, the former flue gas analyzer can analyzed the former flue gas at the air inlet place of desulfuration absorbing tower, the neat stress analyzer can analyzed the neat stress at the gas outlet place in desulfuration absorbing tower, the slurries analyzer can analyzed the pH value of the absorbent in desulfuration absorbing tower, described multiple slurries feed pump, multiple oxidation fan and multiple slurry circulating pump are all provided with converter plant, described slurries feed pump, oxidation fan, slurry circulating pump, former flue gas analyzer, neat stress analyzer, slurries analyzer and converter plant are all electrically connected with PID controller.
In technique scheme, described converter plant is to realize the frequency converter of 0-50Hz converting operation or interior feedback chopper.
The utility model adopts high accuracy on-line chemical analysis instrument to monitor in real time controlled device, and manual intervention is few, intelligence degree is high, fast response time, anticipation disposal ability is strong in advance.
When the utility model being arranged on after in desulfurization automatic control system, desulfurization automatic control system can not only be applicable to transformation project, cost is low, and pH value in absorbent can be stable maintain 5.3 ~ 5.75, absorbent and smoke reaction abundant, desulfuration efficiency can reach 99%, the SO in the exit of desulfuration absorbing tower
2concentration is 10 ~ 35mg/Nm
3.
Accompanying drawing explanation
Fig. 1 is the structural representation containing Desulfurization Control Systems of the present utility model.。
Fig. 2 is the structural representation of the first Desulfurization Control Systems.
1-desulfuration absorbing tower in figure, 21-PID controller, 22-DCS controller, 3-slurries feed pump, 4-oxidation fan, 5-slurry circulating pump, the former flue gas analyzer of 6-, 7-neat stress analyzer, 8-slurries analyzer, 9-converter plant.
Detailed description of the invention
Describe performance of the present utility model in detail below in conjunction with accompanying drawing, but they do not form to restriction of the present utility model, only for example.Make advantage of the present utility model clearly and easy understand by explanation simultaneously.
As shown in Figure 1, the flue gas desulfurization automatic controls of ultra-clean discharge can be realized, comprise PID controller 21, multiple for carrying the slurries feed pump 3 of absorbent to desulfuration absorbing tower 1, multiple for carrying the oxidation fan 4 of air to desulfuration absorbing tower 1, multiple slurry circulating pump 5 for the slurries of desulfuration absorbing tower 1 bottom being transported to desulfuration absorbing tower 1 top, the former flue gas analyzer 6 can analyzed the former flue gas at the air inlet place of desulfuration absorbing tower 1, the neat stress analyzer 7 can analyzed the neat stress at the gas outlet place in desulfuration absorbing tower 1, the slurries analyzer 8 can analyzed the pH value of the absorbent in desulfuration absorbing tower 1, described multiple slurries feed pump 3, multiple oxidation fan 4 and multiple slurry circulating pump 5 are all provided with converter plant 9, described slurries feed pump 3, oxidation fan 4, slurry circulating pump 5, former flue gas analyzer 6, neat stress analyzer 7, slurries analyzer 8 and converter plant 9 are all electrically connected with PID controller 21.
In practical work process, the utility model is mounted in desulfuration absorbing tower, and the utility model and desulfuration absorbing tower form flue gas desulfurization automatic control system jointly.Former flue gas analyzer 6, neat stress analyzer 7 and slurries analyzer 8 are installed on desulfuration absorbing tower 1, multiple slurry circulating pump 5 is all connected with desulfuration absorbing tower 1 top one end, the other end is connected with desulfuration absorbing tower 1 bottom, the air outlet of multiple oxidation fan 4 is all connected with desulfuration absorbing tower 1 bottom, the discharging opening of multiple slurries feed pump 3 is all connected with desulfuration absorbing tower 1 top, described multiple slurries feed pump 3, multiple oxidation fan 4 and multiple slurry circulating pump 5 are all provided with converter plant 9, described former flue gas analyzer 6, neat stress analyzer 7, slurries analyzer 8 and converter plant 9 are all electrically connected with PID controller 21.
In practical work process, flue gas desulfurization automatic control system comprises following processing step: step 1: on each slurries feed pump 3, oxidation fan 4 and slurry circulating pump 5, all install converter plant 9, and adopts PID controller 21 as master controller; Step 2: start slurries feed pump 3, oxidation fan 4 and slurry circulating pump 5 successively, pass into former flue gas in desulfuration absorbing tower 1; Step 3: former flue gas analyzer 6 gathers the data of former flue gas, and by the data information transfer that collects to PID controller 21; Slurries analyzer 8 gathers the data of slurries in desulfuration absorbing tower 1, and by the data information transfer that collects to PID controller 21; Neat stress analyzer 7 gathers the data of the neat stress of discharge in desulfuration absorbing tower 1, and by the data information transfer that collects to PID controller 21; Step 4: respective service data information is passed to PID controller 21 by slurries feed pump 3, oxidation fan 4 and slurry circulating pump 5 respectively; Step 5:PID controller 21 is according to the data message gathered from former flue gas analyzer 6, neat stress analyzer 7, slurries analyzer 8, slurries feed pump 3, oxidation fan 4, slurry circulating pump 5, and whole system realizes the demand of the oxygen amount of feeding, the slurries amount of feeding and slurry circulating pump 5 needed for the ultra-clean discharge of flue gas, calculates the optimum speed of each slurries feed pump 3, oxidation fan 4 and slurry circulating pump 5 respectively; Step 6:PID controller 21 is according to the optimum speed of slurries feed pump 3, oxidation fan 4 and slurry circulating pump 5, corresponding control signal is exported to each converter plant 9, converter plant 9, according to the control signal received, controls the respective pump housing or motor runs with optimum speed.
During real work, desulfuration absorbing tower 1, slurries feed pump 3, oxidation fan 4 and slurry circulating pump 5 are prior art, the utility model all installs converter plant 9 on each slurries feed pump 3, oxidation fan 4 and slurry circulating pump 5, and adopt PID controller 21 as master controller, be also changed to PID controller 21 by existing DCS controller for 22.
Converter plant 9 is connected to each self-corresponding motor or the pump housing, and for the rotating speed of regulable control motor or the pump housing separately.During real work, converter plant can adopt frequency converter, interior feedback chopper, feedback chopper in being preferably.
Former flue gas analyzer 6 and neat stress analyzer 7 include pressure sensor, temperature sensor, SO
2analyzers etc., the chemical composition of the former flue gas of former flue gas analyzer 6 pairs of desulfuration absorbing tower porch carries out on-line monitoring, and the chemical composition of the neat stress in neat stress analyzer 7 pairs of desulfuration absorbing tower exits carries out on-line monitoring.
Slurries analyzer 8 comprises pH meter, densitometer etc.
PID controller 21 is for gathering Gas Parameters, slurried mathematic(al) parameter and device action parameter; Gas Parameters can comprise flue gas flow, pressure, temperature, sulfur content etc., can the equipment of collecting work parameter be various equipment in wet desulfurizing process, such as export the breeze door, oxidation fan, converter plant, pressure sensor etc.; Slurried mathematic(al) parameter comprises slurry pH value, serum density value etc.; Device action parameter is the Common Parameters of the said equipment, as the rotating speed etc. of motor or the pump housing; PID controller 21 pairs of above-mentioned parameter information are carried out analysis and are judged, determine the frequency that oxidation wind demand, lime stone slurry demand and motor run, and export control signal to converter plant.
PID controller 21 can change real-time response according to the fluctuation of former smoke chemistry composition, slurries chemical composition and adjust the proportioning of lime stone slurry and oxidation wind.
As shown in table 1, applicant is in order to can the advantage that has compared with the first desulfurization automatic control system of explanation the utility model clearly, the utility model and the first desulfurization automatic control system contrast by staff, and its comparing result is as follows:
Table 1
As seen from the above table, the utility model by installing converter plant 9 on each pump housing or motor, and after existing DCS controller is changed to PID controller 21, desulfuration efficiency of the present utility model is obviously strengthened, the SO in the exit of desulfuration absorbing tower 1
2concentration obviously reduces (10 ~ 35mg/Nm
3), achieve the ultra-clean discharge of flue gas, not only meet the discharge standard that country is current, but also exceeded national current discharge standard on a large scale, meanwhile, because the utility model only needs to install converter plant 9 and PID controller 21, therefore the utility model can meet project reconstruction requirement, construction cost is low, is suitable for promoting on a large scale.
Other unaccounted part all belongs to prior art.
Claims (2)
1. can realize the flue gas desulfurization automatic controls of ultra-clean discharge, it is characterized in that: comprise PID controller (21), multiple for the slurries feed pump (3) to desulfuration absorbing tower (1) conveying absorbent, multiple for the oxidation fan (4) to desulfuration absorbing tower (1) conveying air, multiple slurry circulating pump (5) for the slurries of desulfuration absorbing tower (1) bottom being transported to desulfuration absorbing tower (1) top, the former flue gas analyzer (6) can analyzed the former flue gas at the air inlet place of desulfuration absorbing tower (1), the neat stress analyzer (7) can analyzed the neat stress at the gas outlet place in desulfuration absorbing tower (1), the slurries analyzer (8) can analyzed the pH value of the absorbent in desulfuration absorbing tower (1), described multiple slurries feed pump (3), multiple oxidation fan (4) and multiple slurry circulating pump (5) are all provided with converter plant (9), described slurries feed pump (3), oxidation fan (4), slurry circulating pump (5), former flue gas analyzer (6), neat stress analyzer (7), slurries analyzer (8) and converter plant (9) are all electrically connected with PID controller (21).
2. the flue gas desulfurization automatic controls that can realize ultra-clean discharge according to claim 1, is characterized in that: described converter plant (9) is for can realize the frequency converter of 0-50Hz converting operation or interior feedback chopper.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107469609A (en) * | 2017-09-06 | 2017-12-15 | 杭州小橙工业设计有限公司 | A kind of full-automatic desulphurization system |
| CN108905573A (en) * | 2018-06-14 | 2018-11-30 | 光大环保技术研究院（南京）有限公司 | A kind of device of flue gas of refuse burning wet process depickling |
| CN109603494A (en) * | 2018-11-13 | 2019-04-12 | 北京国电龙源环保工程有限公司 | Desulfurizer absorption cycle system optimized operation method and absorption cycle system based on big data |
| CN110292844A (en) * | 2019-06-25 | 2019-10-01 | 四川省星船城水泥股份有限公司 | A kind of new dry process preheater kiln tail smoke-box |
-
2015
- 2015-06-05 CN CN201520385915.9U patent/CN204746081U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107469609A (en) * | 2017-09-06 | 2017-12-15 | 杭州小橙工业设计有限公司 | A kind of full-automatic desulphurization system |
| CN108905573A (en) * | 2018-06-14 | 2018-11-30 | 光大环保技术研究院（南京）有限公司 | A kind of device of flue gas of refuse burning wet process depickling |
| CN109603494A (en) * | 2018-11-13 | 2019-04-12 | 北京国电龙源环保工程有限公司 | Desulfurizer absorption cycle system optimized operation method and absorption cycle system based on big data |
| CN110292844A (en) * | 2019-06-25 | 2019-10-01 | 四川省星船城水泥股份有限公司 | A kind of new dry process preheater kiln tail smoke-box |
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