CN114644421A - Method for reducing multi-effect flash evaporation boiling point rise of desulfurization wastewater - Google Patents

Method for reducing multi-effect flash evaporation boiling point rise of desulfurization wastewater Download PDF

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CN114644421A
CN114644421A CN202210270701.1A CN202210270701A CN114644421A CN 114644421 A CN114644421 A CN 114644421A CN 202210270701 A CN202210270701 A CN 202210270701A CN 114644421 A CN114644421 A CN 114644421A
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desulfurization wastewater
boiling point
effect
evaporation
point rise
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薛静
张宇恒
纪祥
王旭
陈国利
韩淑媛
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Jinan Shanyuan Environmental Protection Technology Co ltd
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Jinan Shanyuan Environmental Protection Technology Co ltd
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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
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/06—Flash evaporation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
    • C02F5/105—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances combined with inorganic substances

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a method for reducing multi-effect flash evaporation boiling point rise of desulfurization wastewater, which comprises the following steps: (1) adding polystyrene-divinyl phenyl into the desulfurization wastewater, stirring, and filtering; (2) adding sodium salt into the desulfurization wastewater, uniformly stirring, filtering or directly introducing into a multi-effect evaporator without filtering, and heating to the temperature of 100-113 ℃ for multi-effect evaporation; (3) after multi-effect evaporation, the concentrated solution can be dehydrated by a plate-and-frame filter press, and the solid product is recycled, so that zero emission of the desulfurization wastewater is realized. The method obviously reduces the boiling point rise amplitude in the multi-effect flash evaporation concentration process, achieves higher evaporation rate under the same thermal efficiency, meets the concentration rate, improves the recovery rate of water, and realizes zero discharge of desulfurization wastewater.

Description

Method for reducing multi-effect flash evaporation boiling point rise of desulfurization wastewater
Technical Field
The invention relates to the field of desulfurization wastewater treatment, in particular to a method for reducing the multi-effect flash evaporation boiling point rise of desulfurization wastewater.
Background
The quality of the desulfurized wastewater is complex and is generally Na+、Mg2+、Ca2+、Cl-、F-The plasma concentration is higher, and the suspended solid content is higher, presents the characteristics that salt content is high, corrosivity is strong, is the big difficult problem of power plant realization waste water zero release. CN111892112A adopts low-temperature flash evaporation concentration process coupled with high-temperature flue gas bypass drying process to realize zero discharge of desulfurization wastewater. The principle of the low-temperature flash evaporation concentration process is as follows: the desulfurization wastewater is heated by a heater, separated by a flash evaporation system and subjected to flash evaporation, and evaporated water is condensed and then returns to a desulfurization process water tank. The desulfurization wastewater after low-temperature flash evaporation and concentration can be conveyed into a high-temperature bypass flue gas evaporator, and is atomized by a high-efficiency atomizing nozzle to generate micro liquid drops which are evaporated by high-temperature flue gas introduced from a main flue, and the evaporated water vapor enters a desulfurization tower along with the flue gas and is condensed to supplement water for desulfurization process, so that zero discharge of the desulfurization wastewater is realized.
The low-temperature flash evaporation concentration process can realize desulfurization wastewater reduction, but the desulfurization wastewater has complex water quality, the problem of boiling point rise in the flash evaporation concentration process results in lower evaporation rate, zero emission of the desulfurization wastewater cannot be realized through a flash evaporation system, a high-temperature bypass flue gas evaporation system is introduced to realize zero emission of the desulfurization wastewater, potential influences such as comprehensive energy efficiency and coal ash utilization need to be considered, and the complexity of the process system is increased.
Disclosure of Invention
The invention aims to provide a method for reducing the multi-effect flash evaporation boiling point rise of desulfurization wastewater, which utilizes the principle that different salt solutions have different boiling points, adds corresponding molar quantities of sodium sulfate or sodium carbonate salts into the desulfurization wastewater, replaces salts such as magnesium chloride, calcium chloride and the like with higher boiling points to cause the boiling point rise, obviously reduces the boiling point rise amplitude in the low-temperature flash evaporation concentration process of the desulfurization wastewater, greatly simplifies the process flow and reduces the energy consumption.
The technical scheme of the invention is as follows:
a method for reducing the multi-effect flash evaporation boiling point rise of desulfurization wastewater comprises the following steps:
(1) adding polystyrene-divinyl phenyl into the desulfurization wastewater, stirring, and filtering;
(2) adding sodium salt into the desulfurization wastewater, uniformly stirring, filtering or directly introducing into a multi-effect evaporator without filtering, and heating to the temperature of 100-;
(3) after multi-effect evaporation, the concentrated solution can be dehydrated by a plate-and-frame filter press, and the solid product is recycled, so that zero emission of the desulfurization wastewater is realized.
Preferably, the addition amount of the polystyrene-divinyl phenyl is 0.05% of the mass of the desulfurization wastewater.
Preferably, the sodium salt is sodium carbonate or sodium sulfate.
Preferably, the addition amount of the sodium salt is 5-10% of the mass of the desulfurization waste water. More preferably, the addition amount of the sodium salt is 6-7% of the mass of the desulfurization waste water.
Preferably, heating to 110 ℃ for multi-effect evaporation or heating to 106-113 ℃ for multi-effect evaporation.
Aiming at the problem that zero discharge of the desulfurization wastewater cannot be realized through low-temperature multi-effect flash evaporation concentration, particularly the evaporation efficiency caused by boiling point increase is low, the invention provides a simple and high-efficiency method which is easy to reduce the boiling point increase of a large amount of desulfurization wastewater. And after the sodium carbonate is introduced, the scaling problem in the evaporation process is improved.
Advantageous effects
1. According to the method, the sodium sulfate is introduced as a pretreatment agent, no extra impurity is introduced into the desulfurization wastewater, a separate water tank is not required to be arranged for standing reaction, the process flow is simplified, and zero emission of the desulfurization wastewater is economically and efficiently realized.
2. According to the invention, sodium sulfate is introduced as a pretreatment agent, so that the boiling point rise amplitude in the desulfurization wastewater evaporation process is remarkably reduced, compared with the conventional multi-effect evaporation process, the energy consumption is lower, the wastewater recovery rate is higher, and the operation cost is reduced.
3. According to the invention, sodium carbonate is introduced as a pretreatment agent, so that the problem of blockage caused by an evaporation process structure is solved, and the desulfurization wastewater treatment efficiency is improved.
4. The invention introduces the sodium carbonate as a pretreatment agent, reduces the boiling point rise in the evaporation process of the desulfurization wastewater, has lower energy consumption and higher wastewater recovery rate compared with the conventional multi-effect evaporation process, and reduces the operation cost.
5. According to the invention, after the polystyrene-divinyl phenyl is added, sodium sulfate or sodium carbonate is added, so that the boiling point rise is obviously reduced, the energy consumption is effectively saved, and the wastewater treatment efficiency is improved.
Drawings
FIG. 1 shows a zero-discharge process of desulfurization wastewater.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Example 1
And (4) filtering the desulfurization wastewater of the Huangling power plant by using filter paper to obtain a filtered stock solution. And (4) building a normal pressure distillation device for measuring the boiling point rise of the desulfurization wastewater. Firstly, drying a three-neck flask to record the weight, weighing 800g of stock solution, and adding the stock solution into the three-neck flask after checking a power supply; a liquid phase thermometer (ensuring that the thermometer is immersed in the solution) is arranged at the side opening of the three-mouth flask, a gas phase thermometer is arranged at the upper part, and a condensing tube is arranged at the side part; observing the experimental phenomenon, recording the experimental data shown in table 1, increasing the evaporation capacity along with the increase of the distillation time, and continuously increasing the boiling point of the desulfurization wastewater stock solution to finally reach 130 ℃.
TABLE 1
Figure DEST_PATH_IMAGE001
Note: material concentration = original solution solid content (unchanged)/total weight of solid and liquid remaining after evaporation
Example 2
Taking desulfurization wastewater of a Huang Ling power plant, and filtering the desulfurization wastewater through filter paper to obtain a filtered stock solution; the polystyrene-divinylbenzene group is added in an amount ofStirring 0.05% of the filtered stock solution for 30min, and filtering to obtain the raw water filtrate. Firstly, drying a three-neck flask to record the weight, taking 500ml of raw water filtrate with m =511.56g, and adding Na2SO436.22g of salt, and fully and uniformly stirring. After checking the power supply, adding the stock solution added with the sodium sulfate into a three-neck flask; a liquid phase thermometer (ensuring that the thermometer is immersed in the solution) is arranged at the side opening of the three-mouth flask, a gas phase thermometer is arranged at the upper part, and a condensing tube is arranged at the side part; observing the experimental phenomenon, recording the experimental data and showing in table 2, along with the increase of the distillation time, the evaporation capacity is increased, the boiling point rising amplitude of the desulfurization wastewater stock solution is obviously reduced, and finally, the desulfurization wastewater stock solution is stabilized at 110 ℃.
TABLE 2
Figure DEST_PATH_IMAGE002
Note: evaporation rate = evaporation amount/stock solution amount
Example 3
Taking desulfurization wastewater of a Huang Ling power plant, and filtering the desulfurization wastewater through filter paper to obtain a filtered stock solution; adding polystyrene-divinyl phenyl in an amount of 0.05% of the filtered stock solution, stirring for 30min, and filtering to obtain the raw water filtrate. Firstly, drying a three-neck flask to record the weight, taking 500ml of raw water filtrate with m =511.56g, and adding Na2CO331.8g of a salt was allowed to stand for 1 hour and then filtered to obtain 305.34g of a stock solution. After checking the power supply, adding the stock solution added with the sodium carbonate into a three-neck flask; a liquid phase thermometer (ensuring that the thermometer is immersed in the solution) is arranged at the side opening of the three-mouth flask, a gas phase thermometer is arranged at the upper part, and a condensing tube is arranged at the side part; observing the experimental phenomenon, recording the experimental data and showing in table 3, along with the increase of the distillation time, the evaporation capacity is increased, the boiling point rising amplitude of the desulfurization wastewater stock solution is obviously reduced, and finally, the desulfurization wastewater stock solution is stabilized at 113 ℃. After the experiment is finished, the cooled three-neck flask is observed, and no scaling phenomenon occurs.
TABLE 3
Figure DEST_PATH_IMAGE004
Note: evaporation rate = evaporation amount/stock solution amount.

Claims (7)

1. A method for reducing the multi-effect flash evaporation boiling point rise of desulfurization wastewater is characterized by comprising the following steps:
(1) adding polystyrene-divinyl phenyl into the desulfurization wastewater, stirring, and filtering;
(2) adding sodium salt into the desulfurization wastewater, uniformly stirring, filtering or directly introducing into a multi-effect evaporator without filtering, and heating to the temperature of 100-;
(3) after multi-effect evaporation, the concentrated solution can be dehydrated through a plate-and-frame filter press, solid products are recycled, and zero emission of desulfurization wastewater is realized.
2. The method for reducing the multi-effect flash boiling point rise of the desulfurization wastewater as recited in claim 1, wherein the polystyrene-divinyl benzene is added in an amount of 0.05% of the mass of the desulfurization wastewater.
3. The method for reducing the multi-effect flash evaporation boiling point rise of desulfurization wastewater as recited in claim 1, wherein the sodium salt is sodium carbonate or sodium sulfate.
4. The method for reducing the multi-effect flash boiling point rise of the desulfurization wastewater as recited in claim 1, wherein the sodium salt is added in an amount of 5-10% by mass of the desulfurization wastewater.
5. The method for reducing the multi-effect flash boiling point rise of the desulfurization waste water as recited in claim 4, wherein the addition amount of the sodium salt is 6-7% of the mass of the desulfurization waste water.
6. The method for reducing the multi-effect flash evaporation boiling point rise of the desulfurization wastewater as recited in claim 1, wherein the heating is carried out to 110 ℃ for multi-effect evaporation.
7. The method for reducing the multi-effect flash evaporation boiling point rise of desulfurization wastewater as recited in claim 1, wherein the heating is carried out to 106-113 ℃ for multi-effect evaporation.
CN202210270701.1A 2022-03-18 2022-03-18 Method for reducing multi-effect flash evaporation boiling point rise of desulfurization wastewater Pending CN114644421A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205473143U (en) * 2016-01-18 2016-08-17 李艳萍 High salinity wastewater treatment system
CN210885669U (en) * 2019-10-17 2020-06-30 骆驼集团华南再生资源有限公司 Evaporative crystallization ammonium sulfate concentrated mother liquor processing system
CN111453795A (en) * 2020-04-20 2020-07-28 北京光耀环境工程有限公司 High-magnesium desulfurization wastewater concentration and reduction treatment system and process
CN112479299A (en) * 2020-10-30 2021-03-12 南京大学 Treatment method of wastewater containing precious metals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205473143U (en) * 2016-01-18 2016-08-17 李艳萍 High salinity wastewater treatment system
CN210885669U (en) * 2019-10-17 2020-06-30 骆驼集团华南再生资源有限公司 Evaporative crystallization ammonium sulfate concentrated mother liquor processing system
CN111453795A (en) * 2020-04-20 2020-07-28 北京光耀环境工程有限公司 High-magnesium desulfurization wastewater concentration and reduction treatment system and process
CN112479299A (en) * 2020-10-30 2021-03-12 南京大学 Treatment method of wastewater containing precious metals

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