CN113896358A - High-salinity wastewater recycling and reducing zero-emission system based on chemical regeneration chlorine reduction - Google Patents
High-salinity wastewater recycling and reducing zero-emission system based on chemical regeneration chlorine reduction Download PDFInfo
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- CN113896358A CN113896358A CN202111400892.0A CN202111400892A CN113896358A CN 113896358 A CN113896358 A CN 113896358A CN 202111400892 A CN202111400892 A CN 202111400892A CN 113896358 A CN113896358 A CN 113896358A
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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
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5254—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using magnesium compounds and phosphoric acid for removing ammonia
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/586—Treatment of water, waste water, or sewage by removing specified dissolved compounds by removing ammoniacal nitrogen
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a high-salinity wastewater recycling and decrement zero-emission system based on chemical regeneration chlorine reduction.A boiler feedwater ion exchange regeneration system outlet and a fine treatment ion exchange regeneration system outlet are communicated with a regeneration wastewater neutralization system inlet, and a regeneration wastewater neutralization system outlet is communicated with a wet slag removal system inlet through a pretreatment system; the outlet of the #1 sulfuric acid dosing system and the outlet of the #1 sodium hydroxide dosing system are communicated with a dosing port of a boiler make-up water ion exchange regeneration system; an outlet of the #2 sulfuric acid dosing system and an outlet of the #2 sodium hydroxide dosing system are communicated with a dosing port of the fine treatment ion exchange regeneration system; the dosing port of the regenerated wastewater neutralization system is connected with the #3 sulfuric acid dosing system and the #3 sodium hydroxide dosing system, the system can eliminate chloride ions brought by chemicals, and the high-salinity wastewater is completely consumed by the wet slag removal system by reducing the chlorine source of the whole plant and reducing the water amount of the high-salinity wastewater, so that the zero discharge of the high-salinity wastewater with low cost is realized.
Description
Technical Field
The invention belongs to the field of energy conservation and environmental protection, and relates to a high-salinity wastewater recycling, reducing and zero-emission system based on chemical regeneration chlorine reduction.
Background
The direct-flow cooling type thermal power plant is generally positioned on the coast of Yangtze river, the water quality of a water source is good, and the reverse osmosis-anode bed-cathode bed-mixed bed or the anode bed-cathode bed-mixed bed is generally adopted for boiler feedwater desalination. The high-salinity wastewater of the direct-current cooling type thermal power plant is sourced from desulfurization wastewater and regeneration wastewater, the traditional 'positive bed-negative bed-mixed bed' power plant is adopted for boiler feedwater desalination, and the proportion of the regeneration wastewater in the high-salinity wastewater of the whole plant is up to nearly 40%.
The direct-current cooling type power plant usually supplements the regenerated wastewater and other industrial wastewater into a desulfurization system at present, a high-salt wastewater discharge port of the whole plant is only provided with the desulfurization system, the desulfurization wastewater adopts pretreatment, concentration and decrement, evaporative crystallization or pretreatment, high-temperature flue gas evaporation, the investment and the operation cost are high, the evaporative crystallization has the problem of crystal salt disposal, flue gas solidification has the influence on the main flue and the flue gas treatment efficiency, and a solidified product is treated to have certain environmental risk.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a high-salinity wastewater recycling and decrement zero-emission system based on chemical regeneration chlorine reduction, which can eliminate chloride ions brought by chemicals, reduce the chlorine source of a whole plant, reduce the water amount of high-salinity wastewater, and realize low-cost zero emission of the high-salinity wastewater due to the total consumption of a wet slag removal system.
In order to achieve the purpose, the high-salinity wastewater recycling and decrement zero-emission system based on chemical regeneration and chlorine reduction comprises a pretreatment system, a boiler make-up water ion exchange regeneration system, a #1 sulfuric acid dosing system, a #1 sodium hydroxide dosing system, a fine treatment ion exchange regeneration system, a #2 sulfuric acid dosing system, a #2 sodium hydroxide dosing system, a regenerated wastewater neutralization system, a #3 sulfuric acid dosing system, a #3 sodium hydroxide dosing system and a wet slag removal system;
the outlet of the boiler make-up water ion exchange regeneration system and the outlet of the fine treatment ion exchange regeneration system are communicated with the inlet of the regenerated wastewater neutralization system, and the outlet of the regenerated wastewater neutralization system is communicated with the inlet of the wet slag removal system through the pretreatment system;
the outlet of the #1 sulfuric acid dosing system and the outlet of the #1 sodium hydroxide dosing system are communicated with a dosing port of a boiler make-up water ion exchange regeneration system; an outlet of the #2 sulfuric acid dosing system and an outlet of the #2 sodium hydroxide dosing system are communicated with a dosing port of the fine treatment ion exchange regeneration system; the dosing port of the regeneration wastewater neutralization system is connected with a #3 sulfuric acid dosing system and a #3 sodium hydroxide dosing system.
The pretreatment system comprises a desulfurization system, a desulfurization wastewater turbidity removal system, a desulfurization wastewater deamination system and a desulfurization wastewater reuse system;
the outlet of the regenerated wastewater neutralization system is communicated with the inlet of the wet deslagging system through a desulfurization system, a desulfurization wastewater turbidity removal system, a desulfurization wastewater deamination system and a desulfurization wastewater reuse system in sequence.
Also comprises a turbidity removal medicament dosing system; the outlet of the turbidity removal medicament dosing system is communicated with the dosing port of the desulfurization wastewater turbidity removal system.
Also comprises a deamination medicament dosing system; the outlet of the deamination medicament dosing system is communicated with the dosing port of the desulfurization wastewater deamination system.
The invention has the following beneficial effects:
when the high-salinity wastewater recycling and decrement zero-emission system based on chemical regeneration chlorine reduction is specifically operated, cation resin in a boiler make-up water ion exchange regeneration system and a fine treatment ion exchange regeneration system is regenerated by sulfuric acid, anions are regenerated by sodium hydroxide, regenerated wastewater is neutralized by sulfuric acid and sodium hydroxide, the tradition that hydrochloric acid is used as acid for chemical regeneration and neutralization in a thermal power plant is changed, the hydrochloric acid is replaced by sulfuric acid, chloride ions brought by chemicals are eliminated, the chlorine source in the whole plant is reduced, the water quantity of high-salinity desulfurization wastewater is reduced, in addition, the treated wastewater finally enters a wet slag removal system for recycling, and the low-cost high-salinity wastewater zero-emission system is realized
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is boiler makeup water ion exchange regeneration system, 2 is #1 sulphuric acid charge system, 3 is #1 sodium hydroxide charge system, 4 is the fine processing ion exchange regeneration system, 5 is #2 sulphuric acid charge system, 6 is #2 sodium hydroxide charge system, 7 is regeneration waste water neutralization system, 8 is #3 sulphuric acid charge system, 9 is #3 sodium hydroxide charge system, 10 is the desulfurization system, 11 is desulfurization waste water turbidity removal system, 12 is turbidity removal charge system, 13 is desulfurization waste water deamination system, 14 is deamination medicament charge system, 15 is desulfurization waste water recycling system, 16 is wet deslagging system.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. 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.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the high salinity wastewater recycling and emission reduction zero discharge system based on chemical regeneration and chlorine reduction of the present invention includes a boiler make-up water ion exchange regeneration system 1, #1 sulfuric acid dosing system 2, #1 sodium hydroxide dosing system 3, a fine treatment ion exchange regeneration system 4, #2 sulfuric acid dosing system 5, #2 sodium hydroxide dosing system 6, a regeneration wastewater neutralization system 7, #3 sulfuric acid dosing system 8, #3 sodium hydroxide dosing system 9, a desulfurization system 10, 11 is a desulfurization wastewater turbidity removal system 11, a turbidity removal agent dosing system 12, a desulfurization wastewater deamination system 13, a deamination agent dosing system 14, a desulfurization wastewater recycling system 15 and a wet slag removal system 16;
the outlet of the boiler make-up water ion exchange regeneration system 1 and the outlet of the fine treatment ion exchange regeneration system 4 are communicated with the inlet of a regeneration wastewater neutralization system 7, and the outlet of the regeneration wastewater neutralization system 7 is communicated with the inlet of a wet deslagging system 16 through a desulfurization system 10, a desulfurization wastewater turbidity removal system 11, a desulfurization wastewater deamination system 13 and a desulfurization wastewater reuse system 15 in sequence;
an outlet of the #1 sulfuric acid dosing system 2 and an outlet of the #1 sodium hydroxide dosing system 3 are communicated with a dosing port of the boiler make-up water ion exchange regeneration system 1;
an outlet of the #2 sulfuric acid dosing system 5 and an outlet of the #2 sodium hydroxide dosing system 6 are communicated with a dosing port of the fine treatment ion exchange regeneration system 4;
the dosing port of the regeneration wastewater neutralization system 7 is connected with a #3 sulfuric acid dosing system 8 and a #3 sodium hydroxide dosing system 9.
The outlet of the turbidity removal medicament dosing system 12 is communicated with the dosing port of the desulfurization wastewater turbidity removal system 11;
the outlet of the deamination medicament dosing system 14 is communicated with the dosing port of the desulfurization wastewater deamination system 13.
Cation resin in the boiler make-up water ion exchange regeneration system 1 and the fine treatment ion exchange regeneration system 4 is regenerated by sulfuric acid, anions are regenerated by sodium hydroxide, and regeneration wastewater is neutralized by sulfuric acid and sodium hydroxide, so that the tradition that hydrochloric acid is used as acid for chemical regeneration and neutralization in a thermal power plant is changed, the hydrochloric acid is replaced by sulfuric acid, the source of chlorine is reduced, and the water quantity of high-salt desulfurization wastewater is reduced.
The cation resin in the boiler make-up water ion exchange regeneration system 1 is regenerated by adopting a step-by-step regeneration mode, wherein low-concentration concentrated acid is adopted in the initial stage, and the concentration of the concentrated acid can be improved in the later stage.
The amount of high-salinity wastewater is reduced by the fine treatment ion exchange regeneration system 4, but the ammonia nitrogen concentration of the desulfurization wastewater can be increased, so that in order to reduce the influence of ammonia escape in alkaline conditions on the environment, the desulfurization wastewater is subjected to necessary turbidity removal and deamination treatment before being reused, is reused in the wet slag removal system 16, and is consumed by the wet slag removal system 16.
The turbidity removing agent in the turbidity removing agent dosing system 12 adopts a high-efficiency flocculating agent.
The desulfurization wastewater deamination system 13 adopts an ammonium magnesium phosphate precipitation method to carry out deamination treatment, adopts phosphate as a high-magnesium desulfurization wastewater deamination agent, and adopts phosphate and magnesium salts as a low-magnesium desulfurization wastewater deamination agent;
the desulfurization wastewater is recycled to the wet slag removal system 16, the salt content of the slag water is increased, the corrosion tendency is enhanced, and the corrosion prevention upgrading transformation of the flow passage component of the wet slag removal system 16 is needed.
When the system works, the regeneration wastewater output by the boiler make-up water ion exchange regeneration system 1 and the regeneration wastewater output by the fine treatment ion exchange regeneration system 4 enter a regeneration wastewater neutralization system 7 to be neutralized by sulfuric acid and sodium hydroxide, then enter a desulfurization system 10 to be desulfurized, and then sequentially enter a wet slag discharge system for recycling after passing through a desulfurization wastewater turbidity removal system 11 to remove turbidity, a desulfurization wastewater deamination system 13 to remove ammonia and a desulfurization wastewater recycling system 15.
The above description is only an example of the implementation steps of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A high-salinity wastewater recycling and decrement zero-emission system based on chemical regeneration chlorine reduction is characterized by comprising a pretreatment system, a boiler make-up water ion exchange regeneration system (1), #1 sulfuric acid dosing system (2), #1 sodium hydroxide dosing system (3), a fine treatment ion exchange regeneration system (4), #2 sulfuric acid dosing system (5), #2 sodium hydroxide dosing system (6), a regeneration wastewater neutralization system (7), #3 sulfuric acid dosing system (8), #3 sodium hydroxide dosing system (9) and a wet slag removal system (16);
an outlet of the boiler make-up water ion exchange regeneration system (1) and an outlet of the fine treatment ion exchange regeneration system (4) are communicated with an inlet of a regeneration wastewater neutralization system (7), and an outlet of the regeneration wastewater neutralization system (7) is communicated with an inlet of a wet slag removal system (16) through a pretreatment system;
an outlet of the #1 sulfuric acid dosing system (2) and an outlet of the #1 sodium hydroxide dosing system (3) are communicated with a dosing port of the boiler make-up water ion exchange regeneration system (1); an outlet of the #2 sulfuric acid dosing system (5) and an outlet of the #2 sodium hydroxide dosing system (6) are communicated with a dosing port of the fine treatment ion exchange regeneration system (4); the dosing port of the regeneration wastewater neutralization system (7) is connected with a #3 sulfuric acid dosing system (8) and a #3 sodium hydroxide dosing system (9).
2. The high-salinity wastewater recycling and reducing zero-emission system based on chemical regeneration and chlorine reduction of claim 1, wherein the pretreatment system comprises a desulfurization system (10), a desulfurization wastewater turbidity removal system (11), a desulfurization wastewater deamination system (13) and a desulfurization wastewater recycling system (15);
the outlet of the regenerated wastewater neutralization system (7) is communicated with the inlet of the wet deslagging system (16) through a desulfurization system (10), a desulfurization wastewater turbidity removal system (11), a desulfurization wastewater deamination system (13) and a desulfurization wastewater reuse system (15) in sequence.
3. The high-salinity wastewater recycling and reducing zero-emission system based on chemical regeneration and chlorine reduction of claim 2, characterized by further comprising a turbidity removal agent dosing system (12); the outlet of the turbidity removal medicament dosing system (12) is communicated with the dosing port of the desulfurization wastewater turbidity removal system (11).
4. The high-salinity wastewater recycling and reducing zero-emission system based on chemical regeneration and chlorine reduction of claim 2, characterized by further comprising a deamination agent dosing system (14); the outlet of the deamination medicament dosing system (14) is communicated with the dosing port of the desulfurization wastewater deamination system (13).
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| CN202111400892.0A CN113896358A (en) | 2021-11-19 | 2021-11-19 | High-salinity wastewater recycling and reducing zero-emission system based on chemical regeneration chlorine reduction |
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| CN202111400892.0A CN113896358A (en) | 2021-11-19 | 2021-11-19 | High-salinity wastewater recycling and reducing zero-emission system based on chemical regeneration chlorine reduction |
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