CN211487158U - 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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Abstract
The utility model relates to a high-efficiency grading composite desulfurizing tower with a control system, which comprises a controller, an online monitor and an adjusting valve, wherein 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 utility model discloses realize self-adaptation regulation to entry flue gas load, improved reliability, adaptability and the flexibility of desulfurizing tower operation.
Description
Technical Field
The utility model relates to an environmental protection technical field, concretely relates to high-efficient hierarchical compound desulfurizing tower with 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 an efficient 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, and limestone gypsum slurry with lower pH value is used as the mass transfer devicesThe calcium sulfate is an absorbent, so that 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, so that dust is further removed, and efficient dust removal is realized. 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.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in the problem to above-mentioned prior art exists, provide a high-efficient hierarchical compound desulfurizing tower and control process thereof with control system, it can solve and cause the export to discharge because of the load fluctuation and exceed standard or the too high problem of energy consumption, solve the circulation thick liquid simultaneously and flow velocity of flow certainly and hang down and cause the problem of thick liquid suspension solid deposit, make compound desulfurizing tower have the operation stable, load strong adaptability, control nimble, show energy-conserving characteristics.
The utility model discloses a solve the technical scheme that technical problem that the aforesaid provided adopted and be:
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 beneficial effects of the utility model reside in that:
1. the utility model discloses the desulfurizing tower is through setting up control system, when desulfurizing tower entry flue gas volume and sulfur dioxide content take place undulant, through the valve aperture of controller according to material balance's relation regulation limestone slurry feed control valve, make limestone slurry flow and load match; 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 utility model discloses the desulfurizing tower realizes self-adaptation regulation to entry flue gas load, very big improvement reliability, adaptability and the flexibility of compound desulfurizing tower operation, make compound desulfurizing tower have the operation stable, load strong adaptability, control nimble, show energy-conserving characteristics, be used for the ultralow emission of well high sulphur coal fired flue gas specially.
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 explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of the high-efficiency grading composite desulfurizing 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
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, a 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 utility model discloses an above-mentioned control system makes the operation of compound desulfurizing tower stable, load strong adaptability, control nimble, show energy-conservingly. 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 embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present 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 level by the uppermost spray level slurry circulation pump.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110585886A (en) * | 2019-10-25 | 2019-12-20 | 武汉凯迪电力环保有限公司 | High-efficiency grading composite desulfurizing tower with control system |
| CN113813749A (en) * | 2021-10-25 | 2021-12-21 | 北京美斯顿科技开发有限公司 | A energy-conserving wisdom carbon island for whole factory exhaust gas carbon entrapment |
-
2019
- 2019-10-25 CN CN201921807778.8U patent/CN211487158U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110585886A (en) * | 2019-10-25 | 2019-12-20 | 武汉凯迪电力环保有限公司 | High-efficiency grading composite desulfurizing tower with control system |
| CN113813749A (en) * | 2021-10-25 | 2021-12-21 | 北京美斯顿科技开发有限公司 | A energy-conserving wisdom carbon island for whole factory exhaust gas carbon entrapment |
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