CN114804258A - Method for evaporating desulfurization wastewater outside flue - Google Patents
Method for evaporating desulfurization wastewater outside flue Download PDFInfo
- Publication number
- CN114804258A CN114804258A CN202210154980.5A CN202210154980A CN114804258A CN 114804258 A CN114804258 A CN 114804258A CN 202210154980 A CN202210154980 A CN 202210154980A CN 114804258 A CN114804258 A CN 114804258A
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- CN
- China
- Prior art keywords
- flue
- desulfurization
- desulfurization wastewater
- temperature flue
- water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The invention relates to a desulfurization wastewater treatment method, in particular to a method for evaporating desulfurization wastewater outside a flue in the aluminum industry. Directly evaporating water in the desulfurization wastewater by using high temperature on the outer surface of the high-temperature flue, and periodically treating residual salts; the high-temperature flue is positioned at the inlet of the purification system; the surface of the high-temperature flue or the evaporation tank which is contacted with the desulfurization wastewater is provided with corrosion resistance, and the corrosion resistance is stainless steel or is sprayed by a corrosion-resistant material. The invention has the advantages of simple process, convenient operation and low investment and operation cost, can realize the pervaporation of the desulfurization waste water, simultaneously reduce the flue gas temperature in the flue, prolong the service life of the cloth bag of the dust remover and reduce the water consumption of the desulfurization system.
Description
Technical Field
The invention relates to a desulfurization wastewater treatment method, in particular to a method for evaporating desulfurization wastewater outside a flue in the aluminum industry.
Background
The limestone-gypsum method is a commonly used sulfur dioxide treatment method in industry, has the advantages of high desulfurization efficiency and strong adaptability, and is widely applied to the flue gas treatment of sulfur dioxide. The technology uses limestone slurry to directly contact with the flue gas so as to absorb sulfur dioxide in the flue gas. In the process, pollutants such as dust, chlorine and the like in the flue gas are transferred into the slurry. As the desulfurization process proceeds, Cl in the slurry - And salt substances are continuously concentrated, which affects the quality of gypsum and simultaneously causes slurry poisoning. This is because the salt content is increased, the ionic strength in the slurry is increased, the solubility of calcium sulfite and calcium sulfate is increased, and the absorption of sulfur dioxide in the flue gas by the slurry is suppressed. Not only affects the desulfurization efficiency, but also causes the viscosity of the slurry to increase and the gypsum dehydration to be difficult. Therefore, in order to ensure the normal operation of the desulfurization system, the quality of the desulfurization water must be ensured, and the discharge of desulfurization waste water is indispensable.
The desulfurization waste water is weakly acidic and contains a large amount of suspended substances (ash, inert substances, calcium carbonate, gypsum, etc.), reducing inorganic salts (sulfite, nitrite, etc.), heavy metal ions, chlorides, fluorides, etc. At present, the main treatment method of the desulfurization wastewater is a chemical precipitation method, the main principle is that various impurities and heavy metals in the desulfurization wastewater are removed by various chemicals, and the treated water can reach the standard and be discharged. However, the process has the problems of longer flow, more equipment and more operation and maintenance work. Less desulfurization waste water is generated in the aluminum industry, the chemical precipitation process is arranged to treat the waste water, the cost is higher, a large amount of chemical sludge is generated, high-concentration chloride ions in the water are not removed, and the treated water cannot enter a desulfurization system for recycling. In addition, the treatment mode of the desulfurization wastewater also comprises reverse osmosis crystallization and flue evaporation technologies. The reverse osmosis crystallization is salt separation treatment through a membrane type permeation unit, and then salt separation crystallization is carried out through an evaporation crystallization method. The evaporation technology in the flue is to spray the waste water into the high-temperature flue through a nozzle, the liquid is quickly evaporated under the action of high-temperature flue gas, and pollutants in the waste water are collected by a dust remover. The technology has low modification cost, but because the waste water contains excessive impurities such as chlorine and the like, the flue is easy to corrode and block, and the normal operation of a purification system is influenced. Especially for an electrolytic flue gas purification system, because pollutants in the wastewater return to an electrolytic cell along with fluorine-carrying aluminum oxide, the normal operation of an electrolytic process can be influenced by the long-time accumulation of the pollutants, and the product quality is influenced.
Therefore, aiming at the problems of the existing desulfurization wastewater, a treatment method which has low investment operation cost and simple process and does not influence the operation of the existing system is urgently needed.
Disclosure of Invention
The invention provides a method for evaporating desulfurization wastewater outside a flue, aiming at solving the technical problems that the investment and operation cost is reduced, the process is simple, and the operation of the existing system is not influenced.
In order to achieve the aim, the invention provides a method for evaporating the desulfurization wastewater outside a flue, which directly evaporates water in the desulfurization wastewater by utilizing the high temperature on the outer surface of a high-temperature flue, and periodically treats the residual salts.
The high-temperature flue is positioned at the inlet of the purification system.
The surface of the high-temperature flue or the evaporation tank which is contacted with the desulfurization wastewater is provided with corrosion resistance, and the corrosion resistance is stainless steel or is sprayed by a corrosion-resistant material.
The high-temperature flue is an electrolysis flue gas collecting flue in front of the dry adsorption dust remover or a waste heat boiler outlet flue in the calcining process.
The temperature of the electrolysis flue gas collecting flue is 115-125 ℃; the temperature of the outlet flue of the waste heat boiler in the calcining process is 180-200 ℃.
The desulfurization waste water is directly sprayed on the outer wall of the high-temperature flue in a spraying mode, or an evaporation tank is arranged on the high-temperature flue, and the desulfurization waste water is sent to the evaporation tank.
When the desulfurization wastewater is directly sprayed on the outer surface of the high-temperature flue in a spraying mode, the two ends of the high-temperature flue are provided with the baffles which are sleeved on the high-temperature flue, and the bottoms of the baffles at the two ends are respectively connected with the two sides of the water tank.
Arc-shaped water baffles are arranged above the tops of the two sides of the water tank respectively, the two ends of each arc-shaped water baffle are connected with the baffle respectively, the bottom of each arc-shaped water baffle is connected with the tops of the two sides of the water tank, and each arc-shaped water baffle is arranged outside the high-temperature flue.
The invention has the advantages and effects that:
1. the invention has simple process, convenient operation, low investment and operation cost and extremely low failure rate.
2. The invention does not affect the normal operation of the existing purification system.
3. The invention can realize the pervaporation of the desulfurization wastewater and the zero discharge of the desulfurization wastewater.
4. The invention reduces the temperature of the flue gas in the flue while evaporating the desulfurization waste water, effectively protects the cloth bag of the dust remover and prolongs the service life of the cloth bag.
5. The invention reduces the flue gas temperature in the flue, further reduces the inlet and outlet temperature of the flue gas of the desulfurizing tower, and effectively reduces the water consumption.
Drawings
Fig. 1 is a perspective view of embodiment 1.
Fig. 2 is a perspective view of embodiment 2.
Fig. 3 is a front view of fig. 2.
In the figure: 1. a high temperature flue; 2. an evaporation tank; 3. a water tank; 4. a baffle plate; 5. an arc-shaped water baffle.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in FIG. 1, in the method for evaporating the desulfurization wastewater outside the flue, the high-temperature flue is positioned at the inlet of the purification system, the high-temperature flue is an electrolysis flue gas collecting flue before a dry adsorption dust remover, and the temperature of the electrolysis flue gas collecting flue is 115-125 ℃. Utilize the high temperature of high temperature flue surface to directly evaporate the water in the desulfurization waste water, set up evaporating bath 2 on high temperature flue 1, send desulfurization waste water to evaporating bath 2 in, the surface of evaporating bath 2 sets up anticorrosive, and anticorrosive stainless steel that adopts remains the salt class periodic treatment in evaporating bath 2.
Example 2
As shown in FIG. 2, in the method for evaporating the desulfurization wastewater outside the flue, the high-temperature flue is located at the inlet of the purification system, the high-temperature flue is the outlet flue of the exhaust-heat boiler in the calcination process, and the outlet flue temperature of the exhaust-heat boiler in the calcination process is 180-200 ℃. Utilize the water in the high temperature direct evaporation desulfurization waste water of 1 surface of high temperature flue, the form that adopts the spraying directly sprays on 1 outer wall of high temperature flue, both ends are equipped with baffle 4 on high temperature flue 1, 4 covers of baffle are on high temperature flue 1, 3 both sides top of basin are equipped with arc breakwater 5 respectively, 5 both ends of every arc breakwater are connected with baffle 4 respectively, the bottom and 3 both sides tops of basin of every arc breakwater 5 are connected, every arc breakwater 5 is established in the 1 outside of high temperature flue. Baffle 4 and arc breakwater 5 can prevent that desulfurization waste water from splashing other places, adopts anticorrosive treatment with the high temperature flue 1 of desulfurization waste water contact, adopts the anticorrosive material spraying, and 3 in the basin is fallen to behind desulfurization waste water contact high temperature flue shell, remain the salt class periodic treatment in the basin 3.
Claims (8)
1. A method for evaporating desulfurization wastewater outside a flue is characterized by comprising the following steps: the water in the desulfurization wastewater is directly evaporated by utilizing the high temperature on the outer surface of the high-temperature flue, and the residual salts are periodically treated.
2. The method for evaporating the desulfurized waste water outside the flue according to claim 1, wherein said high temperature flue is located at the inlet of the purification system.
3. The method for evaporating the desulfurization wastewater outside the flue as claimed in claim 1, wherein the surface of the high-temperature flue or the evaporation tank which is in contact with the desulfurization wastewater is provided with corrosion prevention, and the corrosion prevention is performed by stainless steel or spraying by using a corrosion prevention material.
4. The method for evaporating the desulfurization wastewater outside the flue according to claim 1, wherein the high-temperature flue is an electrolysis flue gas collecting flue before a dry adsorption dust remover or an outlet flue of a waste heat boiler in a calcination process.
5. The method as claimed in claim 4, wherein the temperature of the flue gas collecting flue is 115-125 ℃; the temperature of the outlet flue of the waste heat boiler in the calcining process is 180-200 ℃.
6. The method for evaporating the desulfurization waste water outside the flue as claimed in claim 1, wherein the desulfurization waste water is sprayed directly on the outer surface of the high temperature flue in the form of spray, or an evaporation tank is arranged on the high temperature flue, and the desulfurization waste water is sent into the evaporation tank.
7. The method of claim 1, wherein the desulfurization waste water is sprayed directly onto the outer wall of the high temperature flue in the form of spray, the baffles are disposed at two ends of the high temperature flue, the baffles are sleeved on the high temperature flue, and the bottoms of the baffles at the two ends are respectively connected to two sides of the water tank.
8. The method of claim 7, wherein the arc-shaped water baffles are respectively arranged above the top parts of the two sides of the water tank, the two ends of each arc-shaped water baffle are respectively connected with the baffle, the bottom of each arc-shaped water baffle is connected with the top parts of the two sides of the water tank, and each arc-shaped water baffle is arranged outside the high-temperature flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210154980.5A CN114804258A (en) | 2022-02-21 | 2022-02-21 | Method for evaporating desulfurization wastewater outside flue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210154980.5A CN114804258A (en) | 2022-02-21 | 2022-02-21 | Method for evaporating desulfurization wastewater outside flue |
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| Publication Number | Publication Date |
|---|---|
| CN114804258A true CN114804258A (en) | 2022-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210154980.5A Pending CN114804258A (en) | 2022-02-21 | 2022-02-21 | Method for evaporating desulfurization wastewater outside flue |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214901U (en) * | 1987-10-29 | 1988-09-07 | 高淑范 | Dual-inserter cyclone dust collector and heat exchanger |
| KR20070067287A (en) * | 2005-12-23 | 2007-06-28 | 임종석 | The heating device using the waste gas heat of the boiler pipe |
| CN205556138U (en) * | 2015-09-23 | 2016-09-07 | 中国大唐集团科学技术研究院有限公司西北分公司 | Shell -and -tube desulfurization waste water flue gas evaporative concentration device |
| CN108479270A (en) * | 2018-05-30 | 2018-09-04 | 烟台龙源电力技术股份有限公司 | A kind of flue gas condensing clarifier and condensation purification system |
-
2022
- 2022-02-21 CN CN202210154980.5A patent/CN114804258A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87214901U (en) * | 1987-10-29 | 1988-09-07 | 高淑范 | Dual-inserter cyclone dust collector and heat exchanger |
| KR20070067287A (en) * | 2005-12-23 | 2007-06-28 | 임종석 | The heating device using the waste gas heat of the boiler pipe |
| CN205556138U (en) * | 2015-09-23 | 2016-09-07 | 中国大唐集团科学技术研究院有限公司西北分公司 | Shell -and -tube desulfurization waste water flue gas evaporative concentration device |
| CN108479270A (en) * | 2018-05-30 | 2018-09-04 | 烟台龙源电力技术股份有限公司 | A kind of flue gas condensing clarifier and condensation purification system |
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