CN213348405U - Regeneration device of deacidification agent in waste incineration flue gas sodium hydroxide deacidification process - Google Patents
Regeneration device of deacidification agent in waste incineration flue gas sodium hydroxide deacidification process Download PDFInfo
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- CN213348405U CN213348405U CN202020814299.5U CN202020814299U CN213348405U CN 213348405 U CN213348405 U CN 213348405U CN 202020814299 U CN202020814299 U CN 202020814299U CN 213348405 U CN213348405 U CN 213348405U
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Abstract
The utility model provides a regenerating unit of deacidification agent in waste incineration flue gas sodium hydroxide deacidification technology can regenerate out sodium hydroxide in the deacidification thick liquid of waste incineration flue gas, reduces the sodium hydroxide consumption of sodium hydroxide flue gas deacidification technology, improves the economic nature of sodium hydroxide flue gas deacidification technology. The outlet of the deacidification slurry tank is connected with the inlet of the aeration tank; the outlet of the aeration tank is connected with the inlet of the tubular ultrafiltration membrane device; the outlet of the tubular ultrafiltration membrane device is connected with the inlet of the ion selective electrodialysis device; a sodium sulfate solution outlet of the ion selective electrodialysis device is connected with an inlet of the sodium sulfate bipolar membrane electrodialysis device, and a sodium chloride solution outlet of the ion selective electrodialysis device is connected with an inlet of the sodium chloride bipolar membrane electrodialysis device; and the sodium hydroxide solution outlets of the sodium sulfate bipolar membrane electrodialysis device and the sodium chloride bipolar membrane electrodialysis device are connected with the inlet of the deacidification slurry tank.
Description
Technical Field
The utility model relates to a regenerating unit of deacidification agent in waste incineration flue gas sodium hydroxide deacidification technology.
Background
At present, the number of incinerating devices including household garbage incineration and industrial waste incineration is increasing. The flue gas generated by burning these wastes contains acidic substances such as sulfur oxides, nitrogen oxides, hydrogen chloride, and the like. In order to meet the requirement that the sulfur content in the flue gas reaches the current domestic or local emission standard and prevent acidic substances from entering the atmosphere to pollute the environment, the flue gas can be emitted only by deacidification treatment. The prior flue gas deacidification process adopts a method of reacting an alkaline deacidification agent with acidic substances in the flue gas to deacidify. These deacidification agents include sodium hydroxide, ammonia and slaked lime. The deacidification method has the advantages that the deacidification effect of the sodium hydroxide is optimal, secondary pollution caused by easy ammonia escape like ammonia deacidification is avoided, and the method is the most ideal method for stably meeting the smoke emission standard in the field of waste incineration.
However, the market price of sodium hydroxide is expensive compared with other two deacidification agents, and the usable range of sodium sulfate and sodium chloride which are byproducts after the deacidification of the sodium hydroxide is not wide. At present, the deacidification agent in the sodium hydroxide deacidification process generally adopts a lime regeneration method, namely, the waste liquid after the sodium hydroxide deacidification is reacted with calcium hydroxide, and sodium hydroxide can be partially regenerated, but the method has the following defects:
(1) sodium chloride in the waste liquid does not react with calcium hydroxide, so that only a small part of sodium hydroxide can be regenerated, and a large amount of sodium hydroxide still needs to be supplemented during deacidification;
(2) the calcium sulfate gypsum generated after the lime reaction has a small application range and is often sold unsmoothly;
(3) and because of the existence of sodium chloride, a large amount of desulfurization wastewater needs to be discharged, the wastewater contains heavy metals and other first pollutants, the treatment cost is high, and the environmental pollution is easily caused.
Therefore, the deacidification of the sodium hydroxide can not be widely applied all the time, and the problem of how to improve the economy of the deacidification of the sodium hydroxide is always a difficult problem in the field of waste incineration.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the above-mentioned not enough that exists among the prior art, and provide a reasonable in structural design's waste incineration flue gas sodium hydroxide deacidification technology in regenerating sodium hydroxide in the deacidification thick liquid of waste incineration flue gas, reduce the sodium hydroxide consumption of sodium hydroxide flue gas deacidification technology, improve the economic nature of sodium hydroxide flue gas deacidification technology.
The utility model provides a technical scheme that above-mentioned problem adopted is: the utility model provides a regenerating unit of deacidification agent in waste incineration flue gas sodium hydroxide deacidification technology, includes deacidification thick liquid pond, its characterized in that: the device also comprises an aeration tank, a tubular ultrafiltration membrane device, an ion selective electrodialysis device, a sodium sulfate bipolar membrane electrodialysis device and a sodium chloride bipolar membrane electrodialysis device; the outlet of the deacidification slurry tank is connected with the inlet of the aeration tank; the outlet of the aeration tank is connected with the inlet of the tubular ultrafiltration membrane device; the outlet of the tubular ultrafiltration membrane device is connected with the inlet of the ion selective electrodialysis device; a sodium sulfate solution outlet of the ion selective electrodialysis device is connected with an inlet of the sodium sulfate bipolar membrane electrodialysis device, and a sodium chloride solution outlet of the ion selective electrodialysis device is connected with an inlet of the sodium chloride bipolar membrane electrodialysis device; and the sodium hydroxide solution outlets of the sodium sulfate bipolar membrane electrodialysis device and the sodium chloride bipolar membrane electrodialysis device are connected with the inlet of the deacidification slurry tank.
Utility model tubular milipore filter device adopt the tubular milipore filter that forms by the sintering of vinylidene fluoride PVDF.
The ion selective electrodialysis device of the utility model adopts a divalent anion selective ion exchange membrane.
The aperture of the tubular ultrafiltration membrane of the utility model is not more than 0.1 μm.
Compared with the prior art, the utility model, have following advantage and effect:
(1) the utility model discloses can effectively reduce the quantity of sodium hydroxide in the sodium hydroxide deacidification technology, accomplish deacidification thick liquid used repeatedly even, no longer add sodium hydroxide, improve the economic nature of sodium hydroxide deacidification technology greatly.
(2) The utility model only consumes electric energy, does not consume any medicament, and is an energy-saving and environment-friendly measure.
(3) The utility model can produce two industrial raw materials of dilute sulphuric acid and hydrochloric acid, and has wide application.
(4) The utility model discloses can make flue gas deacidification technology not produce deacidification waste water, obtain very high environmental protection benefit.
(5) The utility model discloses can make the sodium hydroxide deacidification obtain promoting in the waste incineration field, improve the desorption efficiency of acid material in the flue gas.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Referring to fig. 1, the utility model discloses an aeration tank 2, tubular milipore filter device 3, ion selectivity electrodialysis device 4, sodium sulfate bipolar membrane electrodialysis device 5, sodium chloride bipolar membrane electrodialysis device 6 and deacidification thick liquid pond 10.
The outlet of the deacidification slurry tank 10 is connected with the inlet of the aeration tank 2; the outlet of the aeration tank 2 is connected with the inlet of the tubular ultrafiltration membrane device 3; the outlet of the tubular ultrafiltration membrane device 3 is connected with the inlet of the ion selective electrodialysis device 4; the sodium sulfate solution outlet of the ion selective electrodialysis device 4 is connected with the inlet of the sodium sulfate bipolar membrane electrodialysis device 5, and the sodium chloride solution outlet of the ion selective electrodialysis device 4 is connected with the inlet of the sodium chloride bipolar membrane electrodialysis device 6. The sodium hydroxide solution outlets of the sodium sulfate bipolar membrane electrodialysis device 5 and the sodium chloride bipolar membrane electrodialysis device 6 are both connected with the inlet of the deacidification slurry tank 10.
The tubular ultrafiltration membrane device 3 adopts a tubular ultrafiltration membrane which is sintered by vinylidene fluoride PVDF and has the aperture not more than 0.1 mu m, and can effectively remove suspended matters in the slurry to obtain deacidified sludge. The deacidified sludge can be dewatered by a centrifugal dehydrator or a plate-and-frame dehydrator and then treated, and clear liquid of the dehydrator can flow back to the deacidified slurry pool 10.
The ion selective electrodialysis device 4 employs a divalent anion selective ion exchange membrane, and can separate a sodium sulfate solution and a sodium chloride solution from the deacidified slurry by means of electrodialysis.
The sodium sulfate bipolar membrane electrodialysis device 5 and the sodium chloride bipolar membrane electrodialysis device 6 can respectively treat a sodium sulfate solution and a sodium chloride solution, and the content of sodium hydroxide in the regenerated deacidification agent is 2-7 mg/L.
The tubular ultrafiltration membrane device 3 adopts sulfuric acid and hydrochloric acid solution generated by a bipolar membrane electrodialysis device as a cleaning medicament.
The method comprises the following steps:
A. deacidifying slurry generated after flue gas is deacidified by sodium hydroxide enters a deacidifying slurry tank 10, and deacidifying slurry 1 in the deacidifying slurry tank 10 enters an aeration tank 2 for aeration;
B. the aerated deacidified slurry is input into a tubular ultrafiltration membrane device 3 through a water pump to remove suspended matters;
C. the permeate of the tubular ultrafiltration membrane device 3 enters an ion selective electrodialysis device 4, and the ion selective electrodialysis device 4 separates the permeate into a sodium sulfate solution and a sodium chloride solution;
D. the sodium sulfate solution produced by the ion selective electrodialysis device 4 enters a sodium sulfate bipolar membrane electrodialysis device 5, and a sulfuric acid solution 8 and a sodium hydroxide solution 7 are produced by the sodium sulfate bipolar membrane electrodialysis device 5;
E. the sodium chloride solution produced by the ion selective electrodialysis device 4 enters a sodium chloride bipolar membrane electrodialysis device 6, and the sodium chloride bipolar membrane electrodialysis device 6 produces a hydrochloric acid solution 9 and a sodium hydroxide solution 7;
F. and conveying the sodium hydroxide solution 7 produced by the sodium sulfate bipolar membrane electrodialysis device 5 and the sodium chloride bipolar membrane electrodialysis device 6 to a deacidification slurry tank 10 for recycling.
The utility model discloses useless deacidification thick liquid that is suitable for is sulfate radical concentration 2000~80000mg/L, suspended solid concentration 1000~3000 mg/L, chloride ion concentration 1000~20000mg/L, circulation deacidification thick liquid 1 more than pH value 9.5. Part of the slurry can be extracted from the deacidification slurry tank and enters the aeration tank, and a bypass can be arranged on a slurry return pipeline of the absorption tower to guide the slurry to the aeration tank. The aeration tank adopts air aeration, and the effect of the aeration tank is mainly to oxidize sulfite into sulfate radical and also can reduce the temperature of the slurry, so that the temperature of the slurry meets the requirement of subsequent membrane treatment.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (4)
1. The utility model provides a regenerating unit of deacidification agent in waste incineration flue gas sodium hydroxide deacidification technology, includes deacidification thick liquid pond, its characterized in that: the device also comprises an aeration tank, a tubular ultrafiltration membrane device, an ion selective electrodialysis device, a sodium sulfate bipolar membrane electrodialysis device and a sodium chloride bipolar membrane electrodialysis device; the outlet of the deacidification slurry tank is connected with the inlet of the aeration tank; the outlet of the aeration tank is connected with the inlet of the tubular ultrafiltration membrane device; the outlet of the tubular ultrafiltration membrane device is connected with the inlet of the ion selective electrodialysis device; a sodium sulfate solution outlet of the ion selective electrodialysis device is connected with an inlet of the sodium sulfate bipolar membrane electrodialysis device, and a sodium chloride solution outlet of the ion selective electrodialysis device is connected with an inlet of the sodium chloride bipolar membrane electrodialysis device; and the sodium hydroxide solution outlets of the sodium sulfate bipolar membrane electrodialysis device and the sodium chloride bipolar membrane electrodialysis device are connected with the inlet of the deacidification slurry tank.
2. The regeneration device of the deacidification agent in the waste incineration flue gas sodium hydroxide deacidification process according to claim 1, characterized in that: the tubular ultrafiltration membrane device adopts a tubular ultrafiltration membrane.
3. The regeneration device of the deacidification agent in the waste incineration flue gas sodium hydroxide deacidification process according to claim 1, characterized in that: the ion selective electrodialysis device adopts a divalent anion selective ion exchange membrane.
4. The regeneration device of the deacidification agent in the waste incineration flue gas sodium hydroxide deacidification process according to claim 2, characterized in that: the pore diameter of the tubular ultrafiltration membrane is not more than 0.1 μm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113698025A (en) * | 2021-07-16 | 2021-11-26 | 浙江省环保集团有限公司 | System and method for recycling acid and alkali from high-salt-content deacidification wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113698025A (en) * | 2021-07-16 | 2021-11-26 | 浙江省环保集团有限公司 | System and method for recycling acid and alkali from high-salt-content deacidification wastewater |
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