CN110585886A - High-efficiency grading composite desulfurizing tower with control system - Google Patents
High-efficiency grading composite desulfurizing tower with control system Download PDFInfo
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- CN110585886A CN110585886A CN201911022665.1A CN201911022665A CN110585886A CN 110585886 A CN110585886 A CN 110585886A CN 201911022665 A CN201911022665 A CN 201911022665A CN 110585886 A CN110585886 A CN 110585886A
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- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 29
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 112
- 239000002002 slurry Substances 0.000 claims abstract description 74
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 69
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000003546 flue gas Substances 0.000 claims abstract description 52
- 235000019738 Limestone Nutrition 0.000 claims abstract description 18
- 239000006028 limestone Substances 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims description 24
- 238000005507 spraying Methods 0.000 claims description 17
- 230000002745 absorbent Effects 0.000 claims description 15
- 239000002250 absorbent Substances 0.000 claims description 15
- 239000007921 spray Substances 0.000 claims description 15
- 238000006477 desulfuration reaction Methods 0.000 claims description 10
- 230000023556 desulfurization Effects 0.000 claims description 10
- 238000012546 transfer Methods 0.000 claims description 10
- 239000010440 gypsum Substances 0.000 claims description 8
- 229910052602 gypsum Inorganic materials 0.000 claims description 8
- 239000011268 mixed slurry Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 230000002596 correlated effect Effects 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 3
- 239000000428 dust Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 230000008021 deposition Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a high-efficiency grading composite desulfurizing tower with a control system, wherein the control system comprises a controller, an online monitor and an adjusting valve, when the inlet flue gas volume and the sulfur dioxide content fluctuate, the controller adjusts the opening degree of a limestone slurry feeding adjusting valve according to the relation of material balance, so that the limestone slurry flow is matched with the load; when the inlet flue gas amount and the sulfur dioxide content fluctuate, the controller adjusts the opening degree of a feed adjusting valve of a liquid-holding layer circulation tank according to the outlet sulfur dioxide content discharge value because the liquid-holding layer pressure drop is positively correlated with the removal efficiency, so that the pressure drop is matched with the load and the discharge; because the pH value of the slurry in the slurry pool is positively correlated with the removal efficiency, the controller adjusts the opening of the discharge pump adjusting valve of the liquid holding layer circulating tank according to the discharge value of the sulfur dioxide content at the outlet, so that the pH value of the slurry is matched with the load and the discharge. The invention realizes self-adaptive adjustment aiming at the inlet flue gas load, and improves the reliability, adaptability and flexibility of the operation of the desulfurizing tower.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a high-efficiency graded composite desulfurizing tower with a control system.
Background
In order to meet the strict standard of ultralow emission of high-sulfur coal flue gas, the conventional method generally adopts a series tower or double-circulation spray tower process to realize SO2The ultra-low emission of the dust is realized by adopting a wet electrostatic dust collector. These two processes, while meeting performance requirements, also have a number of problems. The series tower process exists: 1) the configuration of the double towers and the relatively complete auxiliary system thereof causes the system flow to be relatively complex, the control requirement is high, the initial investment of the project is high, and the workload of later operation, overhaul and maintenance is large; 2) because two desulfurizing towers are arranged, the occupied area is larger than that of a single tower, and the application is obviously restricted by sites; 3) the adaptability to the load is poor, and the energy consumption is high under the low-load working condition. The double-circulation spray tower process comprises the following steps: 1) the secondary absorption still needs a multi-layer spray circulation system, the cost of a tower body and internal parts is high, the number of equipment is relatively large, the initial investment of a project is high, and the workload of later-stage operation, maintenance and repair is large; 2) because the slurry tank outside the tower is arranged, the occupied area is large, and the application is restricted by the field; 3) the self dust removal efficiency can not meet the requirement of ultra-low dust emission, and the wet electric dust remover needs to be matched to meet the dust removal efficiency, so that the cost is high, and the occupied area is large.
In order to solve the problems of the two processes, Chinese patent CN204841409U discloses a high-efficiency gradually-changed graded composite desulfurizing tower, wherein different absorbents and different mass transfer devices are adopted in different areas of the desulfurizing tower, a tray and a spraying layer are adopted as the mass transfer devices at the front end of gas-liquid contact, limestone gypsum slurry with lower pH value is used as the absorbent, and better oxidation effect and gypsum quality are obtained; the tail end of gas-liquid contact adopts a novel high-efficiency S-shaped gas-liquid mass transfer mechanism as mass transfer equipment, limestone slurry circulating independently is used as an absorbent, and the higher pH value of the absorbent is utilized to ensure that SO is absorbed2The absorption reaction is more sufficient, and deep desulfurization is realized; meanwhile, the novel S-shaped gas-liquid mass transfer mechanism is used for foam washing to further remove dust,realizing high-efficiency dust removal. Aiming at the stable working condition, the desulfurization efficiency of the desulfurization tower is up to 99 percent, and the dust removal efficiency is up to 90 percent. However, when the desulfurization tower is applied to actual engineering, the following problems are present: 1) due to actual operation load fluctuation, when the treated flue gas amount or the sulfur content is increased, the discharge of an outlet possibly exceeds the standard; when the amount of the treated flue gas or the sulfur content is reduced, the absorbent is excessive, and the pressure drop of the desulfurizing tower is redundant, so that the operation energy consumption is high; 2) because the area of the practical engineering desulfurizing tower is large, the flow rate of the circulating slurry of the S-shaped gas-liquid mass transfer mechanism flowing into the liquid-holding layer circulating tank through self-flow is low, and the deposition of slurry suspended solids is easily caused.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an efficient grading composite desulfurizing tower with a control system and a control process thereof aiming at the problems existing in the prior art, which can solve the problems of over-standard outlet discharge or over-high energy consumption caused by load fluctuation and the problem of slurry suspended solid deposition caused by low self-flow velocity of circulating slurry, so that the composite desulfurizing tower has the characteristics of stable operation, strong load adaptability, flexible control and obvious energy saving.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a high-efficiency graded composite desulfurizing tower with a control system comprises a tower body, wherein a slurry pool, a flue gas inlet, a spraying layer, a liquid holding layer and a flue gas outlet are sequentially arranged in the tower body from bottom to top; a liquid holding layer circulating tank, a liquid holding layer circulating pump, a liquid holding layer circulating tank discharge pump and an uppermost spraying layer slurry circulating pump are arranged outside the tower body; the desulfurizing tower still includes control system, control system includes the controller and with on-line monitor and governing valve that the controller links to each other, wherein:
the device comprises a desulfurizing tower, a slurry pool, a controller and a controller, wherein a flue gas inlet of the desulfurizing tower is provided with an inlet flue gas flow online monitor and an inlet flue gas sulfur dioxide concentration online monitor, a flue gas outlet is provided with an outlet flue gas sulfur dioxide concentration online monitor, pressure drop online monitors are arranged on the upstream and downstream of a liquid holding layer, the slurry pool is provided with a slurry pH value online detector, the five online monitors are respectively connected with the controller, and monitored data are input into the controller;
a limestone slurry feeding regulating valve is arranged on the absorbent feeding pipe of the liquid holding layer, and the opening degree of the regulating valve is interlocked with the inlet flue gas flow online monitor and the inlet flue gas sulfur dioxide concentration online monitor through a controller;
an outlet pipeline of the liquid holding layer circulating pump is provided with a branch which flows into the liquid holding layer circulating tank, a feed regulating valve of the liquid holding layer circulating tank is arranged on the branch pipeline, and the opening degree of the regulating valve is in linkage control with the pressure drop online monitor and the outlet flue gas sulfur dioxide concentration online monitor through a controller;
the thick liquid of holding liquid layer circulating tank passes through hold liquid layer circulating tank discharge pump send extremely the superiors sprays the entry of layer thick liquid circulating pump, hold liquid layer circulating tank discharge pump and the superiors and spray the connecting pipeline between the layer thick liquid circulating pump and set up on the pipeline and hold liquid layer circulating tank discharge pump governing valve, the aperture of this governing valve pass through the controller with the thick liquid pH value on-line detector in thick liquid pond, export flue gas sulfur dioxide concentration on-line monitor realize chain control.
In the above scheme, the liquid holding layer comprises a liquid collector, an S-shaped gas-liquid mass transfer mechanism and a liquid distributor which are sequentially arranged from bottom to top, the liquid collector is connected with the liquid distributor through the liquid holding layer circulating pump, an absorbent feeding pipe of the liquid holding layer is arranged on a pipeline between the liquid holding layer circulating pump and the liquid distributor, and the absorbent of the liquid holding layer is limestone slurry.
In the scheme, the slurry tank is filled with gypsum slurry, the slurry tank is connected with the spraying layer through the uppermost spraying layer slurry circulating pump, and the absorbent of the spraying layer is limestone-gypsum mixed slurry.
The invention has the beneficial effects that:
1. according to the invention, through arranging the control system, when the flue gas volume and the sulfur dioxide content at the inlet of the desulfurization tower fluctuate, the opening degree of a valve of a limestone slurry feeding regulating valve is regulated by the controller according to the relation of material balance, so that the flow of the limestone slurry is matched with the load; when the amount of flue gas at the inlet of the desulfurizing tower and the content of sulfur dioxide fluctuate, the pressure drop of a liquid holding layer is positively correlated with the removal efficiency, and the pressure drop is matched with the load and the discharge by adjusting the valve opening of a feed adjusting valve of a liquid holding layer circulating tank by a controller according to the discharge value of the content of sulfur dioxide at the outlet; because the pH value of the slurry in the slurry pool is positively correlated with the removal efficiency, the controller adjusts the valve opening of the discharge pump adjusting valve of the liquid holding layer circulating tank according to the discharge value of the sulfur dioxide content at the outlet, so that the pH value of the slurry is matched with the load and the discharge.
2. The desulfurizing tower realizes self-adaptive adjustment aiming at the inlet flue gas load, greatly improves the reliability, adaptability and flexibility of the operation of the composite desulfurizing tower, ensures that the composite desulfurizing tower has the characteristics of stable operation, strong load adaptability, flexible control and remarkable energy saving, and is specially used for ultralow emission of medium-high sulfur coal-fired flue gas.
3. The circulating slurry of the S-shaped gas-liquid mass transfer mechanism is pumped into the liquid-holding layer circulating pump, on one hand, the slurry suspended solid deposition is prevented because the pumping flow rate is far higher than the self-flowing flow rate, on the other hand, the lift of the circulating pump can be greatly reduced after the circulating pump utilizes the part of potential energy, and the power consumption is saved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural diagram of a high-efficiency grading composite desulfurization tower with a control system.
In the figure: 10. a tower body; 11. a slurry tank; 12. a flue gas inlet; 13. a spray layer; 14. holding the liquid layer; 15. a flue gas outlet; 16. a liquid holding layer circulation tank; 17. a liquid-holding layer circulating pump; 18. a discharge pump of the liquid-holding layer circulation tank; 19. the slurry circulating pump of the uppermost spraying layer; 20. a controller; 21. an inlet flue gas flow online monitor; 22. an inlet flue gas sulfur dioxide concentration online monitor; 23. a pressure drop on-line monitor; 24. an outlet flue gas sulfur dioxide concentration online monitor; 25. an online slurry pH value detector; 26. a limestone slurry feed regulating valve; 27. a liquid-holding layer circulation tank feeding regulating valve; 28. and the liquid holding layer circulation tank discharge pump regulating valve.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the high-efficiency staged composite desulfurization tower with a control system according to a preferred embodiment of the present invention includes a tower body 10 and a control system. A slurry pool 11, a flue gas inlet 12, a spraying layer 13, a liquid holding layer 14 and a flue gas outlet 15 are sequentially arranged in the tower body 10 from bottom to top; the outside of the tower body 10 is provided with a liquid-holding layer circulation tank 16, a liquid-holding layer circulation pump 17, a liquid-holding layer circulation tank discharge pump 18 and an uppermost spray layer slurry circulation pump 19. The slurry tank 11 is filled with gypsum slurry (pH value is 5.2-5.8) and is connected with the spraying layer 13 through a slurry circulating pump 19 at the uppermost spraying layer. Hold liquid layer 14 and include liquid collector, S type gas-liquid mass transfer mechanism, the liquid distributor that sets gradually from supreme down, be connected through holding liquid layer circulating pump 17 between liquid collector and the liquid distributor, hold and set up the absorbent (fresh limestone slurry, pH value is 5.8 ~ 6.4) inlet pipe that holds liquid layer 14 on the pipeline between liquid layer circulating pump 17 and the liquid distributor. An outlet pipeline of the liquid-holding layer circulating pump 17 is provided with a branch to flow into the liquid-holding layer circulating tank 16, the slurry in the liquid-holding layer circulating tank 16 is sent to the inlet of the uppermost spraying layer slurry circulating pump 19 through the liquid-holding layer circulating tank discharge pump 18, and the limestone-gypsum mixed slurry is sent to the spraying layer 13 through the uppermost spraying layer slurry circulating pump 19.
The control system of the desulfurizing tower comprises a controller 20 arranged outside the tower, and five online monitors and three regulating valves which are connected with the controller 20, wherein the specific arrangement conditions of the online monitors and the regulating valves are as follows:
1) the flue gas entry 12 of desulfurizing tower is equipped with entry flue gas flow on-line monitor 21 and entry flue gas sulfur dioxide concentration on-line monitor 22, and exhanst gas outlet 15 is equipped with export flue gas sulfur dioxide concentration on-line monitor 24, holds and is equipped with pressure drop on-line monitor 23 between liquid layer 14 upper and lower reaches, is equipped with thick liquid pH value on-line detector 25 in the thick liquid pond 11, and these five on-line monitors are connected with controller 20 respectively, input the data of monitoring to controller 20.
2) A limestone slurry feeding adjusting valve 26 is arranged on an absorbent (fresh limestone slurry) feeding pipe of the liquid holding layer 14, the limestone slurry feeding adjusting valve 26 is connected with a controller 20, and the opening degree of the adjusting valve is in linkage control with an inlet flue gas flow online monitor 21 and an inlet flue gas sulfur dioxide concentration online monitor 22 through the controller 20. When the inlet flue gas amount and the sulfur dioxide content of the desulfurizing tower fluctuate, the limestone slurry feeding regulating valve 26 regulates the opening of the valve according to the relationship of material balance through the controller 20, so that the limestone slurry flow rate is matched with the load. Namely, when the flue gas quantity at the inlet of the desulfurizing tower and the content of sulfur dioxide are increased, the controller 20 controls the opening degree of the valve to be increased; otherwise, the valve opening is decreased.
3) The circulating slurry of holding liquid layer 14 is not through holding liquid layer circulating tank 16, but directly pumps to holding liquid layer circulating pump 17, the outlet pipeline of holding liquid layer circulating pump 17 establishes a branch flow into holding liquid layer circulating tank 16, this branch pipeline sets up and holds liquid layer circulating tank feed regulating valve 27, hold liquid layer circulating tank feed regulating valve 27 and be connected with controller 20, the aperture of this regulating valve passes through controller 20 and holds the online monitor 23 of the pressure drop of liquid layer 14, outlet flue gas sulfur dioxide concentration online monitor 24 realizes interlocking control. When the inlet flue gas volume and the sulfur dioxide content of the desulfurizing tower fluctuate, the controller 20 matches the pressure drop with the load and the discharge by adjusting the opening of the feed adjusting valve 27 of the liquid holding layer circulating tank according to the discharge value of the outlet sulfur dioxide content because the pressure drop of the liquid holding layer 14 is positively correlated with the removal efficiency. That is, when the flue gas load increases and the outlet sulfur dioxide emission concentration increases, the opening of the liquid holding layer circulation tank feed regulating valve 27 is controlled to be smaller than the opening of the limestone slurry feed regulating valve 26 (determined from the liquid holding layer drop), the amount of slurry flowing into the liquid holding layer is larger than the amount of slurry flowing out of the liquid holding layer, the circulating slurry amount of the liquid holding layer increases, the liquid holding layer drop increases, and the outlet sulfur dioxide emission concentration decreases because the liquid holding layer removal efficiency is positively correlated with the drop.
4) The slurry of the liquid-holding layer circulation tank 16 is delivered to the inlet of the uppermost layer spraying layer slurry circulation pump 19 through the liquid-holding layer circulation tank discharge pump 18, a liquid-holding layer circulation tank discharge pump regulating valve 28 is arranged on a connecting pipeline between the liquid-holding layer circulation tank discharge pump 18 and the uppermost layer spraying layer slurry circulation pump 19, the liquid-holding layer circulation tank discharge pump regulating valve 28 is connected with the controller 20, and the opening degree of the regulating valve realizes interlocking control through the controller 20 and the slurry pH value online detector 25 and the outlet flue gas sulfur dioxide concentration online detector 24 of the slurry pool 11. Because the pH value of the slurry in the slurry tank 11 is positively correlated with the removal efficiency, the controller 20 adjusts the opening of the discharge pump adjusting valve 28 of the liquid holding layer circulating tank according to the discharge value of the sulfur dioxide content at the outlet, so that the pH value of the slurry in the slurry tank 11 is matched with the load and the discharge. That is, when flue gas load increases, when export sulfur dioxide emission concentration risees, the increase holds the aperture of liquid layer circulating tank discharge pump governing valve 28, and the increase gets into the high pH value thick liquid volume that sprays layer 13, improves and sprays layer and thick liquid pond thick liquid pH value, because thick liquid pH value and the layer 13 desulfurization efficiency positive correlation that sprays, consequently can reduce export sulfur dioxide emission concentration.
The control system ensures that the composite desulfurization tower runs stably, has strong load adaptability, is flexible to control and obviously saves energy. Meanwhile, the circulating slurry of the liquid holding layer 14 is pumped into the liquid holding layer circulating pump 17, on one hand, the slurry suspended solid deposition is prevented because the pumping flow rate is far higher than the self-flowing flow rate, on the other hand, the lift of the liquid holding layer circulating pump 17 can be greatly reduced after the potential energy is utilized, and the power consumption is saved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A high-efficiency graded composite desulfurizing tower with a control system comprises a tower body, wherein a slurry pool, a flue gas inlet, a spraying layer, a liquid holding layer and a flue gas outlet are sequentially arranged in the tower body from bottom to top; a liquid holding layer circulating tank, a liquid holding layer circulating pump, a liquid holding layer circulating tank discharge pump and an uppermost spraying layer slurry circulating pump are arranged outside the tower body; characterized in that, the desulfurizing tower still includes control system, control system include the controller and with on-line monitor and governing valve that the controller links to each other, wherein:
the device comprises a desulfurizing tower, a slurry pool, a controller and a controller, wherein a flue gas inlet of the desulfurizing tower is provided with an inlet flue gas flow online monitor and an inlet flue gas sulfur dioxide concentration online monitor, a flue gas outlet is provided with an outlet flue gas sulfur dioxide concentration online monitor, pressure drop online monitors are arranged on the upstream and downstream of a liquid holding layer, the slurry pool is provided with a slurry pH value online detector, the five online monitors are respectively connected with the controller, and monitored data are input into the controller;
a limestone slurry feeding regulating valve is arranged on the absorbent feeding pipe of the liquid holding layer, and the opening degree of the regulating valve is interlocked with the inlet flue gas flow online monitor and the inlet flue gas sulfur dioxide concentration online monitor through a controller;
an outlet pipeline of the liquid holding layer circulating pump is provided with a branch which flows into the liquid holding layer circulating tank, a feed regulating valve of the liquid holding layer circulating tank is arranged on the branch pipeline, and the opening degree of the regulating valve is in linkage control with the pressure drop online monitor and the outlet flue gas sulfur dioxide concentration online monitor through a controller;
the thick liquid of holding liquid layer circulating tank passes through hold liquid layer circulating tank discharge pump send extremely the superiors sprays the entry of layer thick liquid circulating pump, hold liquid layer circulating tank discharge pump and the superiors and spray the connecting pipeline between the layer thick liquid circulating pump and set up on the pipeline and hold liquid layer circulating tank discharge pump governing valve, the aperture of this governing valve pass through the controller with the thick liquid pH value on-line detector in thick liquid pond, export flue gas sulfur dioxide concentration on-line monitor realize chain control.
2. The high-efficiency graded composite desulfurization tower with the control system according to claim 1, wherein the liquid holding layer comprises a liquid collector, an S-shaped gas-liquid mass transfer mechanism and a liquid distributor which are sequentially arranged from bottom to top, the liquid collector is connected with the liquid distributor through the liquid holding layer circulating pump, an absorbent feeding pipe of the liquid holding layer is arranged on a pipeline between the liquid holding layer circulating pump and the liquid distributor, and the absorbent of the liquid holding layer is limestone slurry.
3. The tower of claim 2, wherein the slurry tank contains gypsum slurry, and is connected to the spray layer by the slurry circulating pump of the uppermost spray layer, and the absorbent of the spray layer is limestone-gypsum mixed slurry.
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CN111309061A (en) * | 2020-02-25 | 2020-06-19 | 北新集团建材股份有限公司 | Gypsum slurry consistency adjusting and controlling method and consistency detecting device |
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