CN204569740U - A kind of gypsum dehydration system for flue gas desulfurization - Google Patents
A kind of gypsum dehydration system for flue gas desulfurization Download PDFInfo
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- CN204569740U CN204569740U CN201520094897.9U CN201520094897U CN204569740U CN 204569740 U CN204569740 U CN 204569740U CN 201520094897 U CN201520094897 U CN 201520094897U CN 204569740 U CN204569740 U CN 204569740U
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Abstract
The utility model provides a kind of gypsum dehydration system for flue gas desulfurization, belongs to desulfurizer technology neck.This system comprises absorption tower gypsum overboard pump, gypsum rotational flow station, vacuum belt dewaterer and waste-water vortex system.Gypsum slurries in slurry pool of absorption tower is extracted out by absorption tower gypsum overboard pump, be transported to gypsum rotational flow station, carry out one-level dehydration, the underflow of gypsum rotational flow station is transported to vacuum belt dewaterer again and carries out secondary dehydration, gypsum after dehydration imports gypsum storehouse, and the overflow of gypsum rotational flow station enters waste-water vortex system.This waste-water vortex system adopts frequency conversion waste-water vortex pump, effectively controls the Cl in gypsum slurries case
-concentration, ensure that the normal generation of gypsum crystal, and improve efficiency and the quality of gypsum dehydration, and this system is simple and easy to do, cost is low, is suitable for flue gas desulphurization system and uses.
Description
Technical field
The utility model relates to desulfurizer technical field, refers to a kind of gypsum dehydration system for flue gas desulfurization especially.
Background technology
The sulfur method of current domestic use mainly contains: Gypsum Wet, semidrying, in-furnace calcium spraying, seawater method, electronic beam method, ammonia process etc., wherein Limestone-gypsum Wet Flue Gas Desulfurization Process technique has and is suitable for that coal scope is wide, desulfuration efficiency is high, absorbs and utilization ratio is high, operation rate is high, the reliability of work is high, by-produced gypsum is convenient to the advantages such as comprehensive utilization, share of market reaches more than 80%, is environment-protective process the most ripe in thermal power plant's application in the world.
But gypsum quality is subject to smoke components, ash content, absorption tower serum density, chloride ion content, oxidation system operation conditions, the impact that Wingdale quality, feed rate (superfluous lime stone) and vacuum belt dewaterer run.Not good in actual production total gypsum dehydration quality, existing gypsum dehydration system, lime stone slurry carries out countercurrent washing to flue gas in absorption tower, generates calcium sulfite hemihydrate and transfers in slurries with fine granularity, utilizes air that its forced oxidation is generated Crystallization of Gypsum.Extracted out by slurries in absorption tower with gypsum overboard pump, be sent to gypsum swirler, carry out concentrated and gradation, rare orrhorrhea flow to filtrate box; Concentrated bottom slurry is sent to vacuum hydro-extraction conveyor and carries out gypsum dehydration.And the gypsum water ratio general control after dehydration is just up to standard below 10%.Current waste-water vortex pump used is common water pump, the continual overflow by gypsum swirler is transported in waste-water vortex device continuously, make chlorine ion concentration in final waste-water vortex device underflow excessive, not only the carrying out of desulfurization of gypsum in Interference absorb tower, certain infringement is also existed to equipment, meanwhile, because the gypsum crystal generated in desulfurization of gypsum process in absorption tower is poor, finally also result in of poor quality, the problem such as efficiency is low of gypsum dehydration.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of gypsum dehydration system for flue gas desulfurization, this system comprises absorption tower gypsum overboard pump, gypsum rotational flow station, vacuum belt dewaterer and waste-water vortex system, absorption tower gypsum overboard pump is connected with the gypsum swirler in gypsum rotational flow station by pipeline, the underflow of gypsum swirler is transported to vacuum belt dewaterer by pipeline, the overflow of gypsum swirler is transported to waste-water vortex system by pipeline, waste-water vortex system comprises waste-water vortex pump, waste-water vortex device, waste water tank, waste water pump, wherein, waste-water vortex pump is variable frequency pump, what the overflow of gypsum swirler was interrupted by waste-water vortex pump feeds in waste-water vortex device, the underflow of waste-water vortex device is transported in gypsum slurries case by waste water pump, the overflow of waste-water vortex device enters waste water tank by pipeline.
It is 40%-60% that gypsum swirler controls underflow density, and effluent concentration is 2%-5%.
It is 2%-5% that waste-water vortex device controls underflow density, and effluent concentration is 0.1%-0.6%.
The power of motor of waste-water vortex pump is 11KW, voltage 380V, lift 33 meters, flow 8m
3/ h, rotating speed 1470r/min, rated current 22.6A, a fortune one is standby.
The beneficial effect of technique scheme of the present utility model is as follows:
A series of test and operation practical experience show, the utility model is arranged by waste-water vortex pump being changed to frequency conversion, adapt to external conditions better and change the desulfurization wastewater amount change caused, guarantee swirler operating mode simultaneously and stablize waste water quality and the backwater amount entering screening system, becoming the means of supplementing out economy of filtrate runoff investigation.When underload, waste water system continuous frequency conversion runs not only can maintain operating mode in tower, and the more important thing is that the Flow-rate adjustment of mating with load can be carried out under the prerequisite of economical operation, controllability is better.
Accompanying drawing explanation
Fig. 1 is gypsum dehydration system schematic diagram of the present utility model.
Wherein:
1-absorption tower gypsum overboard pump; 2-gypsum swirler; 3-vacuum belt dewaterer; 4-waste-water vortex pump; 5-waste-water vortex device; 6-waste water tank; 7-waste water pump; 8-gypsum slurries case.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The utility model, for problems such as the gypsum dehydration system dewatering efficiency in existing flue gas desulphurization system are low, of poor quality, provides a kind of gypsum dehydration system for flue gas desulfurization.
As shown in Figure 1, gypsum dehydration system schematic diagram of the present utility model, absorption tower gypsum overboard pump 1 connects the gypsum swirler 2 in gypsum rotational flow station by pipeline, many group gypsum swirlers 2 are had in gypsum rotational flow station, the underflow of gypsum swirler 2 is transported to vacuum belt dewaterer 3 by pipeline, vacuum belt dewaterer 3 pairs of gypsum dewater further, the overflow of gypsum swirler 2 is transported to waste-water vortex system by pipeline, that is interrupted by waste-water vortex pump 4 feeds in waste-water vortex device 5 by gypsum swirler 2 overflow, further dehydration, the underflow of waste-water vortex device 5 is transported in gypsum slurries case 8 by waste water pump 7, utilize in order to desulfurization, the overflow of waste-water vortex device 5 by Cemented filling in waste water tank 6.
When actual motion, the quantity of gypsum swirler 2 can be selected as required, and controlling its underflow density is 50%, and effluent concentration is 3.5%, and the quantity of waste-water vortex device 5 is selected according to need of production, and controlling its underflow density is 3%, and effluent concentration is 0.5%.Waste-water vortex pump horsepower is 11KW, voltage 380V, lift 33 meters, flow 8m
3/ h, rotating speed 1470r/min, rated current 22.6A, a fortune one is standby.
The two-way conveying of absorption tower gypsum overboard pump 1, during work, continus convergence slurries are to gypsum swirler 2 or return to absorption tower, and when in tower, serum density is lower than set(ting)value, slurries return to absorption tower; When serum density reaches set(ting)value, then enter gypsum swirler 2.Now before gypsum swirler 2, reflux bypass is used for stablizing inlet pressure.
In slurry pool of absorption tower, gypsum constantly produces.In order to make serum density remain in certain operating range, gypsum slurries (containing 15% solids content) need be extracted out from absorption tower.Slurries get to gypsum rotational flow station by absorption tower gypsum overboard pump 1, carry out the dehydration of gypsum one-level.Gypsum rotational flow station underflow gypsum solid content about 50%, delivers to the further dehydration of vacuum belt dewaterer 3 and is less than 10% to moisture, import gypsum storehouse and transport outward.The overflow solids content about 3.5% of gypsum swirler 2, in order to control the content (being no more than 20000ppm) of Cl ion in absorption tower, an overflow slurry under gravity part returns to absorption tower, and a part enters waste water drainage system.After the utility model adopts the frequency conversion of waste-water vortex pump 4 to arrange, adapt to external conditions better and change the desulfurization wastewater amount change caused, guarantee swirler operating mode simultaneously and stablize waste water quality and the backwater amount entering screening system, becoming the means of supplementing out economy of filtrate runoff investigation.When underload, waste water system continuous frequency conversion runs not only can maintain operating mode in tower, and the more important thing is that the Flow-rate adjustment of mating with load can be carried out under the prerequisite of economical operation, controllability is better.
This system makes gypsum slurries in desulfurization operation improve, and dehydrating effect significantly improves.In native system, the overflow of gypsum swirler adopts intermittent discharge, makes Cl in tower
-fluctuation of concentration is comparatively large, eliminates at present always at high Cl
-running under concentration causes gypsum to generate poor situation, effectively slow down the situation of equipment corrosion, improves the work-ing life of equipment and the available rate of whole system.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (4)
1. the gypsum dehydration system for flue gas desulfurization, comprise absorption tower gypsum overboard pump (1), gypsum rotational flow station, vacuum belt dewaterer (3) and waste-water vortex system, absorption tower gypsum overboard pump (1) is connected with the gypsum swirler (2) in gypsum rotational flow station by pipeline, gypsum swirler (2) is provided with underflow hole and overflow weir, underflow hole communicates with vacuum belt dewaterer (3), overflow weir communicates with waste-water vortex system, it is characterized in that: described waste-water vortex system comprises waste-water vortex pump (4), waste-water vortex device (5), waste water tank (6), waste water pump (7), wherein, waste-water vortex pump (4) is variable frequency pump, the overflow weir of gypsum swirler (2) communicates with waste-water vortex pump (4), waste-water vortex pump (4) is connected with waste-water vortex device (5), waste-water vortex device (5) has underflow hole and overflow weir, underflow hole communicates with waste water pump (7), underflow is transported in gypsum slurries case (8), the overflow weir of waste-water vortex device (5) communicates with waste water tank (6).
2. a kind of gypsum dehydration system for flue gas desulfurization according to claim 1, is characterized in that: it is 40%-60% that described gypsum swirler (2) controls underflow density, and effluent concentration is 2%-5%.
3. a kind of gypsum dehydration system for flue gas desulfurization according to claim 1, is characterized in that: described waste-water vortex pump (4) power of motor 11KW, voltage 380V, lift 33 meters, flow 8m
3/ h, rotating speed 1470r/min, rated current 22.6A, a fortune one is standby.
4. a kind of gypsum dehydration system for flue gas desulfurization according to claim 1, is characterized in that: it is 2%-5% that described waste-water vortex device (5) controls underflow density, and effluent concentration is 0.1%-0.6%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520094897.9U CN204569740U (en) | 2015-02-10 | 2015-02-10 | A kind of gypsum dehydration system for flue gas desulfurization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112441764A (en) * | 2020-11-30 | 2021-03-05 | 天津中材工程研究中心有限公司 | Improved structure of gypsum dewatering system of cement wet desulphurization process in cement industry |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112441764A (en) * | 2020-11-30 | 2021-03-05 | 天津中材工程研究中心有限公司 | Improved structure of gypsum dewatering system of cement wet desulphurization process in cement industry |
| CN112441764B (en) * | 2020-11-30 | 2022-07-12 | 天津中材工程研究中心有限公司 | Improved structure of gypsum dewatering system of cement wet desulphurization process in cement industry |
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